xref: /freebsd/sys/netinet6/nd6.c (revision 501adf0140ea2a5af2d14f84e4eb2c039204a3d2)
1caf43b02SWarner Losh /*-
282cd038dSYoshinobu Inoue  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
382cd038dSYoshinobu Inoue  * All rights reserved.
482cd038dSYoshinobu Inoue  *
582cd038dSYoshinobu Inoue  * Redistribution and use in source and binary forms, with or without
682cd038dSYoshinobu Inoue  * modification, are permitted provided that the following conditions
782cd038dSYoshinobu Inoue  * are met:
882cd038dSYoshinobu Inoue  * 1. Redistributions of source code must retain the above copyright
982cd038dSYoshinobu Inoue  *    notice, this list of conditions and the following disclaimer.
1082cd038dSYoshinobu Inoue  * 2. Redistributions in binary form must reproduce the above copyright
1182cd038dSYoshinobu Inoue  *    notice, this list of conditions and the following disclaimer in the
1282cd038dSYoshinobu Inoue  *    documentation and/or other materials provided with the distribution.
1382cd038dSYoshinobu Inoue  * 3. Neither the name of the project nor the names of its contributors
1482cd038dSYoshinobu Inoue  *    may be used to endorse or promote products derived from this software
1582cd038dSYoshinobu Inoue  *    without specific prior written permission.
1682cd038dSYoshinobu Inoue  *
1782cd038dSYoshinobu Inoue  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
1882cd038dSYoshinobu Inoue  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1982cd038dSYoshinobu Inoue  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
2082cd038dSYoshinobu Inoue  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
2182cd038dSYoshinobu Inoue  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
2282cd038dSYoshinobu Inoue  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
2382cd038dSYoshinobu Inoue  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2482cd038dSYoshinobu Inoue  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
2582cd038dSYoshinobu Inoue  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
2682cd038dSYoshinobu Inoue  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
2782cd038dSYoshinobu Inoue  * SUCH DAMAGE.
28b48287a3SDavid E. O'Brien  *
29b48287a3SDavid E. O'Brien  *	$KAME: nd6.c,v 1.144 2001/05/24 07:44:00 itojun Exp $
3082cd038dSYoshinobu Inoue  */
3182cd038dSYoshinobu Inoue 
32b48287a3SDavid E. O'Brien #include <sys/cdefs.h>
33b48287a3SDavid E. O'Brien __FBSDID("$FreeBSD$");
34b48287a3SDavid E. O'Brien 
35686cdd19SJun-ichiro itojun Hagino #include "opt_inet.h"
36686cdd19SJun-ichiro itojun Hagino #include "opt_inet6.h"
37686cdd19SJun-ichiro itojun Hagino 
3882cd038dSYoshinobu Inoue #include <sys/param.h>
3982cd038dSYoshinobu Inoue #include <sys/systm.h>
4033841545SHajimu UMEMOTO #include <sys/callout.h>
4182cd038dSYoshinobu Inoue #include <sys/malloc.h>
4282cd038dSYoshinobu Inoue #include <sys/mbuf.h>
4382cd038dSYoshinobu Inoue #include <sys/socket.h>
4482cd038dSYoshinobu Inoue #include <sys/sockio.h>
4582cd038dSYoshinobu Inoue #include <sys/time.h>
4682cd038dSYoshinobu Inoue #include <sys/kernel.h>
47686cdd19SJun-ichiro itojun Hagino #include <sys/protosw.h>
4882cd038dSYoshinobu Inoue #include <sys/errno.h>
4982cd038dSYoshinobu Inoue #include <sys/syslog.h>
506e6b3f7cSQing Li #include <sys/lock.h>
516e6b3f7cSQing Li #include <sys/rwlock.h>
5282cd038dSYoshinobu Inoue #include <sys/queue.h>
5357f60867SMark Johnston #include <sys/sdt.h>
5433841545SHajimu UMEMOTO #include <sys/sysctl.h>
5582cd038dSYoshinobu Inoue 
5682cd038dSYoshinobu Inoue #include <net/if.h>
5776039bc8SGleb Smirnoff #include <net/if_var.h>
5831b3783cSHajimu UMEMOTO #include <net/if_arc.h>
5982cd038dSYoshinobu Inoue #include <net/if_dl.h>
6082cd038dSYoshinobu Inoue #include <net/if_types.h>
612049fdeeSMatthew N. Dodd #include <net/iso88025.h>
628e5fd461SMatthew N. Dodd #include <net/fddi.h>
6382cd038dSYoshinobu Inoue #include <net/route.h>
644b79449eSBjoern A. Zeeb #include <net/vnet.h>
6582cd038dSYoshinobu Inoue 
6682cd038dSYoshinobu Inoue #include <netinet/in.h>
6757f60867SMark Johnston #include <netinet/in_kdtrace.h>
686e6b3f7cSQing Li #include <net/if_llatbl.h>
6982cd038dSYoshinobu Inoue #include <netinet/if_ether.h>
7082cd038dSYoshinobu Inoue #include <netinet6/in6_var.h>
71686cdd19SJun-ichiro itojun Hagino #include <netinet/ip6.h>
7282cd038dSYoshinobu Inoue #include <netinet6/ip6_var.h>
73a1f7e5f8SHajimu UMEMOTO #include <netinet6/scope6_var.h>
7482cd038dSYoshinobu Inoue #include <netinet6/nd6.h>
75a283298cSHiroki Sato #include <netinet6/in6_ifattach.h>
76686cdd19SJun-ichiro itojun Hagino #include <netinet/icmp6.h>
771db8d1f8SAna Kukec #include <netinet6/send.h>
7882cd038dSYoshinobu Inoue 
79743eee66SSUZUKI Shinsuke #include <sys/limits.h>
80743eee66SSUZUKI Shinsuke 
81aed55708SRobert Watson #include <security/mac/mac_framework.h>
82aed55708SRobert Watson 
8382cd038dSYoshinobu Inoue #define ND6_SLOWTIMER_INTERVAL (60 * 60) /* 1 hour */
8482cd038dSYoshinobu Inoue #define ND6_RECALC_REACHTM_INTERVAL (60 * 120) /* 2 hours */
8582cd038dSYoshinobu Inoue 
8647e8d432SGleb Smirnoff #define SIN6(s) ((const struct sockaddr_in6 *)(s))
8782cd038dSYoshinobu Inoue 
8882cea7e6SBjoern A. Zeeb /* timer values */
8982cea7e6SBjoern A. Zeeb VNET_DEFINE(int, nd6_prune)	= 1;	/* walk list every 1 seconds */
9082cea7e6SBjoern A. Zeeb VNET_DEFINE(int, nd6_delay)	= 5;	/* delay first probe time 5 second */
9182cea7e6SBjoern A. Zeeb VNET_DEFINE(int, nd6_umaxtries)	= 3;	/* maximum unicast query */
9282cea7e6SBjoern A. Zeeb VNET_DEFINE(int, nd6_mmaxtries)	= 3;	/* maximum multicast query */
9382cea7e6SBjoern A. Zeeb VNET_DEFINE(int, nd6_useloopback) = 1;	/* use loopback interface for
9482cea7e6SBjoern A. Zeeb 					 * local traffic */
9582cea7e6SBjoern A. Zeeb VNET_DEFINE(int, nd6_gctimer)	= (60 * 60 * 24); /* 1 day: garbage
9682cea7e6SBjoern A. Zeeb 					 * collection timer */
97686cdd19SJun-ichiro itojun Hagino 
98686cdd19SJun-ichiro itojun Hagino /* preventing too many loops in ND option parsing */
993e288e62SDimitry Andric static VNET_DEFINE(int, nd6_maxndopt) = 10; /* max # of ND options allowed */
10082cea7e6SBjoern A. Zeeb 
10182cea7e6SBjoern A. Zeeb VNET_DEFINE(int, nd6_maxnudhint) = 0;	/* max # of subsequent upper
10282cea7e6SBjoern A. Zeeb 					 * layer hints */
1033e288e62SDimitry Andric static VNET_DEFINE(int, nd6_maxqueuelen) = 1; /* max pkts cached in unresolved
10482cea7e6SBjoern A. Zeeb 					 * ND entries */
1051e77c105SRobert Watson #define	V_nd6_maxndopt			VNET(nd6_maxndopt)
1061e77c105SRobert Watson #define	V_nd6_maxqueuelen		VNET(nd6_maxqueuelen)
107686cdd19SJun-ichiro itojun Hagino 
10882cea7e6SBjoern A. Zeeb #ifdef ND6_DEBUG
10982cea7e6SBjoern A. Zeeb VNET_DEFINE(int, nd6_debug) = 1;
11082cea7e6SBjoern A. Zeeb #else
11182cea7e6SBjoern A. Zeeb VNET_DEFINE(int, nd6_debug) = 0;
11282cea7e6SBjoern A. Zeeb #endif
11333841545SHajimu UMEMOTO 
11430aee131SAndrey V. Elsukov static eventhandler_tag lle_event_eh;
11530aee131SAndrey V. Elsukov 
11682cd038dSYoshinobu Inoue /* for debugging? */
1176e6b3f7cSQing Li #if 0
11882cd038dSYoshinobu Inoue static int nd6_inuse, nd6_allocated;
1196e6b3f7cSQing Li #endif
12082cd038dSYoshinobu Inoue 
121eddfbb76SRobert Watson VNET_DEFINE(struct nd_drhead, nd_defrouter);
122eddfbb76SRobert Watson VNET_DEFINE(struct nd_prhead, nd_prefix);
12382cd038dSYoshinobu Inoue 
12482cea7e6SBjoern A. Zeeb VNET_DEFINE(int, nd6_recalc_reachtm_interval) = ND6_RECALC_REACHTM_INTERVAL;
1251e77c105SRobert Watson #define	V_nd6_recalc_reachtm_interval	VNET(nd6_recalc_reachtm_interval)
12644e33a07SMarko Zec 
1271db8d1f8SAna Kukec int	(*send_sendso_input_hook)(struct mbuf *, struct ifnet *, int, int);
1281db8d1f8SAna Kukec 
129f0316e1aSAlexander V. Chernikov static int nd6_is_new_addr_neighbor(const struct sockaddr_in6 *,
1306f56329aSXin LI 	struct ifnet *);
1319233d8f3SDavid E. O'Brien static void nd6_setmtu0(struct ifnet *, struct nd_ifinfo *);
1329233d8f3SDavid E. O'Brien static void nd6_slowtimo(void *);
1339233d8f3SDavid E. O'Brien static int regen_tmpaddr(struct in6_ifaddr *);
134d3cdb716SAlexander V. Chernikov static void nd6_free(struct llentry *, int);
13517a03656SEric van Gyzen static void nd6_free_redirect(const struct llentry *);
1369233d8f3SDavid E. O'Brien static void nd6_llinfo_timer(void *);
1376e6b3f7cSQing Li static void clear_llinfo_pqueue(struct llentry *);
138f6b84910SAlexander V. Chernikov static void nd6_rtrequest(int, struct rtentry *, struct rt_addrinfo *);
1391fe201c3SAlexander V. Chernikov static int nd6_resolve_slow(struct ifnet *, struct mbuf *,
1401fe201c3SAlexander V. Chernikov     const struct sockaddr_in6 *, u_char *, uint32_t *);
1411fe201c3SAlexander V. Chernikov static int nd6_need_cache(struct ifnet *);
1421fe201c3SAlexander V. Chernikov 
14333841545SHajimu UMEMOTO 
1443e288e62SDimitry Andric static VNET_DEFINE(struct callout, nd6_slowtimo_ch);
1451e77c105SRobert Watson #define	V_nd6_slowtimo_ch		VNET(nd6_slowtimo_ch)
146eddfbb76SRobert Watson 
147eddfbb76SRobert Watson VNET_DEFINE(struct callout, nd6_timer_ch);
148eddfbb76SRobert Watson 
14930aee131SAndrey V. Elsukov static void
15030aee131SAndrey V. Elsukov nd6_lle_event(void *arg __unused, struct llentry *lle, int evt)
15130aee131SAndrey V. Elsukov {
15230aee131SAndrey V. Elsukov 	struct rt_addrinfo rtinfo;
153314294deSAlexander V. Chernikov 	struct sockaddr_in6 dst;
15430aee131SAndrey V. Elsukov 	struct sockaddr_dl gw;
15530aee131SAndrey V. Elsukov 	struct ifnet *ifp;
15630aee131SAndrey V. Elsukov 	int type;
15730aee131SAndrey V. Elsukov 
15830aee131SAndrey V. Elsukov 	LLE_WLOCK_ASSERT(lle);
15930aee131SAndrey V. Elsukov 
160314294deSAlexander V. Chernikov 	if (lltable_get_af(lle->lle_tbl) != AF_INET6)
161314294deSAlexander V. Chernikov 		return;
162314294deSAlexander V. Chernikov 
16330aee131SAndrey V. Elsukov 	switch (evt) {
16430aee131SAndrey V. Elsukov 	case LLENTRY_RESOLVED:
16530aee131SAndrey V. Elsukov 		type = RTM_ADD;
16630aee131SAndrey V. Elsukov 		KASSERT(lle->la_flags & LLE_VALID,
16730aee131SAndrey V. Elsukov 		    ("%s: %p resolved but not valid?", __func__, lle));
16830aee131SAndrey V. Elsukov 		break;
16930aee131SAndrey V. Elsukov 	case LLENTRY_EXPIRED:
17030aee131SAndrey V. Elsukov 		type = RTM_DELETE;
17130aee131SAndrey V. Elsukov 		break;
17230aee131SAndrey V. Elsukov 	default:
17330aee131SAndrey V. Elsukov 		return;
17430aee131SAndrey V. Elsukov 	}
17530aee131SAndrey V. Elsukov 
176314294deSAlexander V. Chernikov 	ifp = lltable_get_ifp(lle->lle_tbl);
17730aee131SAndrey V. Elsukov 
17830aee131SAndrey V. Elsukov 	bzero(&dst, sizeof(dst));
17930aee131SAndrey V. Elsukov 	bzero(&gw, sizeof(gw));
18030aee131SAndrey V. Elsukov 	bzero(&rtinfo, sizeof(rtinfo));
181314294deSAlexander V. Chernikov 	lltable_fill_sa_entry(lle, (struct sockaddr *)&dst);
18230aee131SAndrey V. Elsukov 	dst.sin6_scope_id = in6_getscopezone(ifp,
183314294deSAlexander V. Chernikov 	    in6_addrscope(&dst.sin6_addr));
18430aee131SAndrey V. Elsukov 	gw.sdl_len = sizeof(struct sockaddr_dl);
18530aee131SAndrey V. Elsukov 	gw.sdl_family = AF_LINK;
18630aee131SAndrey V. Elsukov 	gw.sdl_alen = ifp->if_addrlen;
18730aee131SAndrey V. Elsukov 	gw.sdl_index = ifp->if_index;
18830aee131SAndrey V. Elsukov 	gw.sdl_type = ifp->if_type;
18930aee131SAndrey V. Elsukov 	if (evt == LLENTRY_RESOLVED)
19030aee131SAndrey V. Elsukov 		bcopy(&lle->ll_addr, gw.sdl_data, ifp->if_addrlen);
19130aee131SAndrey V. Elsukov 	rtinfo.rti_info[RTAX_DST] = (struct sockaddr *)&dst;
19230aee131SAndrey V. Elsukov 	rtinfo.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&gw;
19330aee131SAndrey V. Elsukov 	rtinfo.rti_addrs = RTA_DST | RTA_GATEWAY;
19430aee131SAndrey V. Elsukov 	rt_missmsg_fib(type, &rtinfo, RTF_HOST | RTF_LLDATA | (
19530aee131SAndrey V. Elsukov 	    type == RTM_ADD ? RTF_UP: 0), 0, RT_DEFAULT_FIB);
19630aee131SAndrey V. Elsukov }
19730aee131SAndrey V. Elsukov 
19882cd038dSYoshinobu Inoue void
1991272577eSXin LI nd6_init(void)
20082cd038dSYoshinobu Inoue {
20182cd038dSYoshinobu Inoue 
20244e33a07SMarko Zec 	LIST_INIT(&V_nd_prefix);
20344e33a07SMarko Zec 
204686cdd19SJun-ichiro itojun Hagino 	/* initialization of the default router list */
205603724d3SBjoern A. Zeeb 	TAILQ_INIT(&V_nd_defrouter);
20682cea7e6SBjoern A. Zeeb 
20782cd038dSYoshinobu Inoue 	/* start timer */
208603724d3SBjoern A. Zeeb 	callout_init(&V_nd6_slowtimo_ch, 0);
209603724d3SBjoern A. Zeeb 	callout_reset(&V_nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,
210f6dfe47aSMarko Zec 	    nd6_slowtimo, curvnet);
211d6ad6a86SMark Johnston 
212d6ad6a86SMark Johnston 	nd6_dad_init();
21330aee131SAndrey V. Elsukov 	if (IS_DEFAULT_VNET(curvnet))
21430aee131SAndrey V. Elsukov 		lle_event_eh = EVENTHANDLER_REGISTER(lle_event, nd6_lle_event,
21530aee131SAndrey V. Elsukov 		    NULL, EVENTHANDLER_PRI_ANY);
21682cd038dSYoshinobu Inoue }
21782cd038dSYoshinobu Inoue 
218bc29160dSMarko Zec #ifdef VIMAGE
219bc29160dSMarko Zec void
220bc29160dSMarko Zec nd6_destroy()
221bc29160dSMarko Zec {
222bc29160dSMarko Zec 
223bc29160dSMarko Zec 	callout_drain(&V_nd6_slowtimo_ch);
224bc29160dSMarko Zec 	callout_drain(&V_nd6_timer_ch);
22530aee131SAndrey V. Elsukov 	if (IS_DEFAULT_VNET(curvnet))
22630aee131SAndrey V. Elsukov 		EVENTHANDLER_DEREGISTER(lle_event, lle_event_eh);
227bc29160dSMarko Zec }
228bc29160dSMarko Zec #endif
229bc29160dSMarko Zec 
23031b1bfe1SHajimu UMEMOTO struct nd_ifinfo *
2311272577eSXin LI nd6_ifattach(struct ifnet *ifp)
23282cd038dSYoshinobu Inoue {
23331b1bfe1SHajimu UMEMOTO 	struct nd_ifinfo *nd;
23482cd038dSYoshinobu Inoue 
23539e19560SBjoern A. Zeeb 	nd = (struct nd_ifinfo *)malloc(sizeof(*nd), M_IP6NDP, M_WAITOK|M_ZERO);
23631b1bfe1SHajimu UMEMOTO 	nd->initialized = 1;
23782cd038dSYoshinobu Inoue 
23831b1bfe1SHajimu UMEMOTO 	nd->chlim = IPV6_DEFHLIM;
23931b1bfe1SHajimu UMEMOTO 	nd->basereachable = REACHABLE_TIME;
24031b1bfe1SHajimu UMEMOTO 	nd->reachable = ND_COMPUTE_RTIME(nd->basereachable);
24131b1bfe1SHajimu UMEMOTO 	nd->retrans = RETRANS_TIMER;
242a283298cSHiroki Sato 
243a283298cSHiroki Sato 	nd->flags = ND6_IFF_PERFORMNUD;
244a283298cSHiroki Sato 
245af805644SHiroki Sato 	/* A loopback interface always has ND6_IFF_AUTO_LINKLOCAL.
246af805644SHiroki Sato 	 * XXXHRS: Clear ND6_IFF_AUTO_LINKLOCAL on an IFT_BRIDGE interface by
247af805644SHiroki Sato 	 * default regardless of the V_ip6_auto_linklocal configuration to
248af805644SHiroki Sato 	 * give a reasonable default behavior.
249af805644SHiroki Sato 	 */
250af805644SHiroki Sato 	if ((V_ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) ||
251af805644SHiroki Sato 	    (ifp->if_flags & IFF_LOOPBACK))
252a283298cSHiroki Sato 		nd->flags |= ND6_IFF_AUTO_LINKLOCAL;
253af805644SHiroki Sato 	/*
254af805644SHiroki Sato 	 * A loopback interface does not need to accept RTADV.
255af805644SHiroki Sato 	 * XXXHRS: Clear ND6_IFF_ACCEPT_RTADV on an IFT_BRIDGE interface by
256af805644SHiroki Sato 	 * default regardless of the V_ip6_accept_rtadv configuration to
257af805644SHiroki Sato 	 * prevent the interface from accepting RA messages arrived
258af805644SHiroki Sato 	 * on one of the member interfaces with ND6_IFF_ACCEPT_RTADV.
259af805644SHiroki Sato 	 */
260af805644SHiroki Sato 	if (V_ip6_accept_rtadv &&
261af805644SHiroki Sato 	    !(ifp->if_flags & IFF_LOOPBACK) &&
262af805644SHiroki Sato 	    (ifp->if_type != IFT_BRIDGE))
263a283298cSHiroki Sato 			nd->flags |= ND6_IFF_ACCEPT_RTADV;
264e7fa8d0aSHiroki Sato 	if (V_ip6_no_radr && !(ifp->if_flags & IFF_LOOPBACK))
265e7fa8d0aSHiroki Sato 		nd->flags |= ND6_IFF_NO_RADR;
26631b1bfe1SHajimu UMEMOTO 
26731b1bfe1SHajimu UMEMOTO 	/* XXX: we cannot call nd6_setmtu since ifp is not fully initialized */
26831b1bfe1SHajimu UMEMOTO 	nd6_setmtu0(ifp, nd);
26931b1bfe1SHajimu UMEMOTO 
27031b1bfe1SHajimu UMEMOTO 	return nd;
27131b1bfe1SHajimu UMEMOTO }
27231b1bfe1SHajimu UMEMOTO 
27331b1bfe1SHajimu UMEMOTO void
2741272577eSXin LI nd6_ifdetach(struct nd_ifinfo *nd)
27531b1bfe1SHajimu UMEMOTO {
27631b1bfe1SHajimu UMEMOTO 
27731b1bfe1SHajimu UMEMOTO 	free(nd, M_IP6NDP);
27882cd038dSYoshinobu Inoue }
27982cd038dSYoshinobu Inoue 
28082cd038dSYoshinobu Inoue /*
28182cd038dSYoshinobu Inoue  * Reset ND level link MTU. This function is called when the physical MTU
28282cd038dSYoshinobu Inoue  * changes, which means we might have to adjust the ND level MTU.
28382cd038dSYoshinobu Inoue  */
28482cd038dSYoshinobu Inoue void
2851272577eSXin LI nd6_setmtu(struct ifnet *ifp)
28682cd038dSYoshinobu Inoue {
28731b1bfe1SHajimu UMEMOTO 
28831b1bfe1SHajimu UMEMOTO 	nd6_setmtu0(ifp, ND_IFINFO(ifp));
28931b1bfe1SHajimu UMEMOTO }
29031b1bfe1SHajimu UMEMOTO 
29131b1bfe1SHajimu UMEMOTO /* XXX todo: do not maintain copy of ifp->if_mtu in ndi->maxmtu */
29231b1bfe1SHajimu UMEMOTO void
2931272577eSXin LI nd6_setmtu0(struct ifnet *ifp, struct nd_ifinfo *ndi)
29431b1bfe1SHajimu UMEMOTO {
29531b3783cSHajimu UMEMOTO 	u_int32_t omaxmtu;
29631b1bfe1SHajimu UMEMOTO 
29731b3783cSHajimu UMEMOTO 	omaxmtu = ndi->maxmtu;
29882cd038dSYoshinobu Inoue 
29982cd038dSYoshinobu Inoue 	switch (ifp->if_type) {
30031b3783cSHajimu UMEMOTO 	case IFT_ARCNET:
30131b3783cSHajimu UMEMOTO 		ndi->maxmtu = MIN(ARC_PHDS_MAXMTU, ifp->if_mtu); /* RFC2497 */
30282cd038dSYoshinobu Inoue 		break;
30382cd038dSYoshinobu Inoue 	case IFT_FDDI:
30431b3783cSHajimu UMEMOTO 		ndi->maxmtu = MIN(FDDIIPMTU, ifp->if_mtu); /* RFC2467 */
30582cd038dSYoshinobu Inoue 		break;
3062049fdeeSMatthew N. Dodd 	case IFT_ISO88025:
3072049fdeeSMatthew N. Dodd 		 ndi->maxmtu = MIN(ISO88025_MAX_MTU, ifp->if_mtu);
3082049fdeeSMatthew N. Dodd 		 break;
30982cd038dSYoshinobu Inoue 	default:
31082cd038dSYoshinobu Inoue 		ndi->maxmtu = ifp->if_mtu;
31182cd038dSYoshinobu Inoue 		break;
31282cd038dSYoshinobu Inoue 	}
31382cd038dSYoshinobu Inoue 
31482cd038dSYoshinobu Inoue 	/*
31531b3783cSHajimu UMEMOTO 	 * Decreasing the interface MTU under IPV6 minimum MTU may cause
31631b3783cSHajimu UMEMOTO 	 * undesirable situation.  We thus notify the operator of the change
31731b3783cSHajimu UMEMOTO 	 * explicitly.  The check for omaxmtu is necessary to restrict the
31831b3783cSHajimu UMEMOTO 	 * log to the case of changing the MTU, not initializing it.
31982cd038dSYoshinobu Inoue 	 */
32031b3783cSHajimu UMEMOTO 	if (omaxmtu >= IPV6_MMTU && ndi->maxmtu < IPV6_MMTU) {
32131b3783cSHajimu UMEMOTO 		log(LOG_NOTICE, "nd6_setmtu0: "
32231b3783cSHajimu UMEMOTO 		    "new link MTU on %s (%lu) is too small for IPv6\n",
32331b3783cSHajimu UMEMOTO 		    if_name(ifp), (unsigned long)ndi->maxmtu);
32482cd038dSYoshinobu Inoue 	}
32531b3783cSHajimu UMEMOTO 
326603724d3SBjoern A. Zeeb 	if (ndi->maxmtu > V_in6_maxmtu)
32731b3783cSHajimu UMEMOTO 		in6_setmaxmtu(); /* check all interfaces just in case */
32831b3783cSHajimu UMEMOTO 
32982cd038dSYoshinobu Inoue }
33082cd038dSYoshinobu Inoue 
33182cd038dSYoshinobu Inoue void
3321272577eSXin LI nd6_option_init(void *opt, int icmp6len, union nd_opts *ndopts)
33382cd038dSYoshinobu Inoue {
33407eb2995SHajimu UMEMOTO 
33582cd038dSYoshinobu Inoue 	bzero(ndopts, sizeof(*ndopts));
33682cd038dSYoshinobu Inoue 	ndopts->nd_opts_search = (struct nd_opt_hdr *)opt;
33782cd038dSYoshinobu Inoue 	ndopts->nd_opts_last
33882cd038dSYoshinobu Inoue 		= (struct nd_opt_hdr *)(((u_char *)opt) + icmp6len);
33982cd038dSYoshinobu Inoue 
34082cd038dSYoshinobu Inoue 	if (icmp6len == 0) {
34182cd038dSYoshinobu Inoue 		ndopts->nd_opts_done = 1;
34282cd038dSYoshinobu Inoue 		ndopts->nd_opts_search = NULL;
34382cd038dSYoshinobu Inoue 	}
34482cd038dSYoshinobu Inoue }
34582cd038dSYoshinobu Inoue 
34682cd038dSYoshinobu Inoue /*
34782cd038dSYoshinobu Inoue  * Take one ND option.
34882cd038dSYoshinobu Inoue  */
34982cd038dSYoshinobu Inoue struct nd_opt_hdr *
3501272577eSXin LI nd6_option(union nd_opts *ndopts)
35182cd038dSYoshinobu Inoue {
35282cd038dSYoshinobu Inoue 	struct nd_opt_hdr *nd_opt;
35382cd038dSYoshinobu Inoue 	int olen;
35482cd038dSYoshinobu Inoue 
35539e19560SBjoern A. Zeeb 	KASSERT(ndopts != NULL, ("%s: ndopts == NULL", __func__));
35639e19560SBjoern A. Zeeb 	KASSERT(ndopts->nd_opts_last != NULL, ("%s: uninitialized ndopts",
35739e19560SBjoern A. Zeeb 	    __func__));
3582ce62dceSSUZUKI Shinsuke 	if (ndopts->nd_opts_search == NULL)
35982cd038dSYoshinobu Inoue 		return NULL;
36082cd038dSYoshinobu Inoue 	if (ndopts->nd_opts_done)
36182cd038dSYoshinobu Inoue 		return NULL;
36282cd038dSYoshinobu Inoue 
36382cd038dSYoshinobu Inoue 	nd_opt = ndopts->nd_opts_search;
36482cd038dSYoshinobu Inoue 
36519391949SKris Kennaway 	/* make sure nd_opt_len is inside the buffer */
36619391949SKris Kennaway 	if ((caddr_t)&nd_opt->nd_opt_len >= (caddr_t)ndopts->nd_opts_last) {
36719391949SKris Kennaway 		bzero(ndopts, sizeof(*ndopts));
36819391949SKris Kennaway 		return NULL;
36919391949SKris Kennaway 	}
37019391949SKris Kennaway 
37182cd038dSYoshinobu Inoue 	olen = nd_opt->nd_opt_len << 3;
37282cd038dSYoshinobu Inoue 	if (olen == 0) {
37382cd038dSYoshinobu Inoue 		/*
37482cd038dSYoshinobu Inoue 		 * Message validation requires that all included
37582cd038dSYoshinobu Inoue 		 * options have a length that is greater than zero.
37682cd038dSYoshinobu Inoue 		 */
37782cd038dSYoshinobu Inoue 		bzero(ndopts, sizeof(*ndopts));
37882cd038dSYoshinobu Inoue 		return NULL;
37982cd038dSYoshinobu Inoue 	}
38082cd038dSYoshinobu Inoue 
38182cd038dSYoshinobu Inoue 	ndopts->nd_opts_search = (struct nd_opt_hdr *)((caddr_t)nd_opt + olen);
38219391949SKris Kennaway 	if (ndopts->nd_opts_search > ndopts->nd_opts_last) {
38319391949SKris Kennaway 		/* option overruns the end of buffer, invalid */
38419391949SKris Kennaway 		bzero(ndopts, sizeof(*ndopts));
38519391949SKris Kennaway 		return NULL;
38619391949SKris Kennaway 	} else if (ndopts->nd_opts_search == ndopts->nd_opts_last) {
38719391949SKris Kennaway 		/* reached the end of options chain */
38882cd038dSYoshinobu Inoue 		ndopts->nd_opts_done = 1;
38982cd038dSYoshinobu Inoue 		ndopts->nd_opts_search = NULL;
39082cd038dSYoshinobu Inoue 	}
39182cd038dSYoshinobu Inoue 	return nd_opt;
39282cd038dSYoshinobu Inoue }
39382cd038dSYoshinobu Inoue 
39482cd038dSYoshinobu Inoue /*
39582cd038dSYoshinobu Inoue  * Parse multiple ND options.
39682cd038dSYoshinobu Inoue  * This function is much easier to use, for ND routines that do not need
39782cd038dSYoshinobu Inoue  * multiple options of the same type.
39882cd038dSYoshinobu Inoue  */
39982cd038dSYoshinobu Inoue int
4001272577eSXin LI nd6_options(union nd_opts *ndopts)
40182cd038dSYoshinobu Inoue {
40282cd038dSYoshinobu Inoue 	struct nd_opt_hdr *nd_opt;
40382cd038dSYoshinobu Inoue 	int i = 0;
40482cd038dSYoshinobu Inoue 
40539e19560SBjoern A. Zeeb 	KASSERT(ndopts != NULL, ("%s: ndopts == NULL", __func__));
40639e19560SBjoern A. Zeeb 	KASSERT(ndopts->nd_opts_last != NULL, ("%s: uninitialized ndopts",
40739e19560SBjoern A. Zeeb 	    __func__));
4082ce62dceSSUZUKI Shinsuke 	if (ndopts->nd_opts_search == NULL)
40982cd038dSYoshinobu Inoue 		return 0;
41082cd038dSYoshinobu Inoue 
41182cd038dSYoshinobu Inoue 	while (1) {
41282cd038dSYoshinobu Inoue 		nd_opt = nd6_option(ndopts);
4132ce62dceSSUZUKI Shinsuke 		if (nd_opt == NULL && ndopts->nd_opts_last == NULL) {
41482cd038dSYoshinobu Inoue 			/*
41582cd038dSYoshinobu Inoue 			 * Message validation requires that all included
41682cd038dSYoshinobu Inoue 			 * options have a length that is greater than zero.
41782cd038dSYoshinobu Inoue 			 */
418e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_nd_badopt);
41982cd038dSYoshinobu Inoue 			bzero(ndopts, sizeof(*ndopts));
42082cd038dSYoshinobu Inoue 			return -1;
42182cd038dSYoshinobu Inoue 		}
42282cd038dSYoshinobu Inoue 
4232ce62dceSSUZUKI Shinsuke 		if (nd_opt == NULL)
42482cd038dSYoshinobu Inoue 			goto skip1;
42582cd038dSYoshinobu Inoue 
42682cd038dSYoshinobu Inoue 		switch (nd_opt->nd_opt_type) {
42782cd038dSYoshinobu Inoue 		case ND_OPT_SOURCE_LINKADDR:
42882cd038dSYoshinobu Inoue 		case ND_OPT_TARGET_LINKADDR:
42982cd038dSYoshinobu Inoue 		case ND_OPT_MTU:
43082cd038dSYoshinobu Inoue 		case ND_OPT_REDIRECTED_HEADER:
43111d8451dSHiroki Sato 		case ND_OPT_NONCE:
43282cd038dSYoshinobu Inoue 			if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
43333841545SHajimu UMEMOTO 				nd6log((LOG_INFO,
43433841545SHajimu UMEMOTO 				    "duplicated ND6 option found (type=%d)\n",
43533841545SHajimu UMEMOTO 				    nd_opt->nd_opt_type));
43682cd038dSYoshinobu Inoue 				/* XXX bark? */
43782cd038dSYoshinobu Inoue 			} else {
43882cd038dSYoshinobu Inoue 				ndopts->nd_opt_array[nd_opt->nd_opt_type]
43982cd038dSYoshinobu Inoue 					= nd_opt;
44082cd038dSYoshinobu Inoue 			}
44182cd038dSYoshinobu Inoue 			break;
44282cd038dSYoshinobu Inoue 		case ND_OPT_PREFIX_INFORMATION:
44382cd038dSYoshinobu Inoue 			if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) {
44482cd038dSYoshinobu Inoue 				ndopts->nd_opt_array[nd_opt->nd_opt_type]
44582cd038dSYoshinobu Inoue 					= nd_opt;
44682cd038dSYoshinobu Inoue 			}
44782cd038dSYoshinobu Inoue 			ndopts->nd_opts_pi_end =
44882cd038dSYoshinobu Inoue 				(struct nd_opt_prefix_info *)nd_opt;
44982cd038dSYoshinobu Inoue 			break;
450abbe8356SBjoern A. Zeeb 		/* What about ND_OPT_ROUTE_INFO? RFC 4191 */
451abbe8356SBjoern A. Zeeb 		case ND_OPT_RDNSS:	/* RFC 6106 */
452abbe8356SBjoern A. Zeeb 		case ND_OPT_DNSSL:	/* RFC 6106 */
453abbe8356SBjoern A. Zeeb 			/*
454abbe8356SBjoern A. Zeeb 			 * Silently ignore options we know and do not care about
455abbe8356SBjoern A. Zeeb 			 * in the kernel.
456abbe8356SBjoern A. Zeeb 			 */
457abbe8356SBjoern A. Zeeb 			break;
45882cd038dSYoshinobu Inoue 		default:
45982cd038dSYoshinobu Inoue 			/*
46082cd038dSYoshinobu Inoue 			 * Unknown options must be silently ignored,
46182cd038dSYoshinobu Inoue 			 * to accomodate future extension to the protocol.
46282cd038dSYoshinobu Inoue 			 */
46333841545SHajimu UMEMOTO 			nd6log((LOG_DEBUG,
46482cd038dSYoshinobu Inoue 			    "nd6_options: unsupported option %d - "
46533841545SHajimu UMEMOTO 			    "option ignored\n", nd_opt->nd_opt_type));
46682cd038dSYoshinobu Inoue 		}
46782cd038dSYoshinobu Inoue 
46882cd038dSYoshinobu Inoue skip1:
46982cd038dSYoshinobu Inoue 		i++;
470603724d3SBjoern A. Zeeb 		if (i > V_nd6_maxndopt) {
471e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_nd_toomanyopt);
47233841545SHajimu UMEMOTO 			nd6log((LOG_INFO, "too many loop in nd opt\n"));
47382cd038dSYoshinobu Inoue 			break;
47482cd038dSYoshinobu Inoue 		}
47582cd038dSYoshinobu Inoue 
47682cd038dSYoshinobu Inoue 		if (ndopts->nd_opts_done)
47782cd038dSYoshinobu Inoue 			break;
47882cd038dSYoshinobu Inoue 	}
47982cd038dSYoshinobu Inoue 
48082cd038dSYoshinobu Inoue 	return 0;
48182cd038dSYoshinobu Inoue }
48282cd038dSYoshinobu Inoue 
48382cd038dSYoshinobu Inoue /*
484743eee66SSUZUKI Shinsuke  * ND6 timer routine to handle ND6 entries
48582cd038dSYoshinobu Inoue  */
48682cd038dSYoshinobu Inoue void
4876e6b3f7cSQing Li nd6_llinfo_settimer_locked(struct llentry *ln, long tick)
488743eee66SSUZUKI Shinsuke {
489ef8d671cSHajimu UMEMOTO 	int canceled;
490ef8d671cSHajimu UMEMOTO 
491e6950476SBjoern A. Zeeb 	LLE_WLOCK_ASSERT(ln);
492e6950476SBjoern A. Zeeb 
493743eee66SSUZUKI Shinsuke 	if (tick < 0) {
4946e6b3f7cSQing Li 		ln->la_expire = 0;
495743eee66SSUZUKI Shinsuke 		ln->ln_ntick = 0;
4960447c136SAlexander V. Chernikov 		canceled = callout_stop(&ln->lle_timer);
497743eee66SSUZUKI Shinsuke 	} else {
4987d26db17SHiroki Sato 		ln->la_expire = time_uptime + tick / hz;
4996e6b3f7cSQing Li 		LLE_ADDREF(ln);
500743eee66SSUZUKI Shinsuke 		if (tick > INT_MAX) {
501743eee66SSUZUKI Shinsuke 			ln->ln_ntick = tick - INT_MAX;
5020447c136SAlexander V. Chernikov 			canceled = callout_reset(&ln->lle_timer, INT_MAX,
503743eee66SSUZUKI Shinsuke 			    nd6_llinfo_timer, ln);
504743eee66SSUZUKI Shinsuke 		} else {
505743eee66SSUZUKI Shinsuke 			ln->ln_ntick = 0;
5060447c136SAlexander V. Chernikov 			canceled = callout_reset(&ln->lle_timer, tick,
507743eee66SSUZUKI Shinsuke 			    nd6_llinfo_timer, ln);
508743eee66SSUZUKI Shinsuke 		}
509743eee66SSUZUKI Shinsuke 	}
510ef8d671cSHajimu UMEMOTO 	if (canceled)
511ef8d671cSHajimu UMEMOTO 		LLE_REMREF(ln);
512743eee66SSUZUKI Shinsuke }
51382cd038dSYoshinobu Inoue 
51426deb882SAlexander V. Chernikov /*
51526deb882SAlexander V. Chernikov * Gets source address of the first packet in hold queue
51626deb882SAlexander V. Chernikov * and stores it in @src.
51726deb882SAlexander V. Chernikov * Returns pointer to @src (if hold queue is not empty) or NULL.
51826deb882SAlexander V. Chernikov *
51926deb882SAlexander V. Chernikov */
52026deb882SAlexander V. Chernikov static struct in6_addr *
52126deb882SAlexander V. Chernikov nd6_llinfo_get_holdsrc(struct llentry *ln, struct in6_addr *src)
52226deb882SAlexander V. Chernikov {
52326deb882SAlexander V. Chernikov 	struct ip6_hdr hdr;
52426deb882SAlexander V. Chernikov 	struct mbuf *m;
52526deb882SAlexander V. Chernikov 
52626deb882SAlexander V. Chernikov 	if (ln->la_hold == NULL)
52726deb882SAlexander V. Chernikov 		return (NULL);
52826deb882SAlexander V. Chernikov 
52926deb882SAlexander V. Chernikov 	/*
53026deb882SAlexander V. Chernikov 	 * assume every packet in la_hold has the same IP header
53126deb882SAlexander V. Chernikov 	 */
53226deb882SAlexander V. Chernikov 	m = ln->la_hold;
53326deb882SAlexander V. Chernikov 	if (sizeof(hdr) < m->m_len)
53426deb882SAlexander V. Chernikov 		return (NULL);
53526deb882SAlexander V. Chernikov 
53626deb882SAlexander V. Chernikov 	m_copydata(m, 0, sizeof(hdr), (caddr_t)&hdr);
53726deb882SAlexander V. Chernikov 	*src = hdr.ip6_src;
53826deb882SAlexander V. Chernikov 
53926deb882SAlexander V. Chernikov 	return (src);
54026deb882SAlexander V. Chernikov }
54126deb882SAlexander V. Chernikov 
5426e6b3f7cSQing Li void
5436e6b3f7cSQing Li nd6_llinfo_settimer(struct llentry *ln, long tick)
5446e6b3f7cSQing Li {
5456e6b3f7cSQing Li 
5466e6b3f7cSQing Li 	LLE_WLOCK(ln);
5476e6b3f7cSQing Li 	nd6_llinfo_settimer_locked(ln, tick);
5486e6b3f7cSQing Li 	LLE_WUNLOCK(ln);
5496e6b3f7cSQing Li }
5506e6b3f7cSQing Li 
551743eee66SSUZUKI Shinsuke static void
5521272577eSXin LI nd6_llinfo_timer(void *arg)
553743eee66SSUZUKI Shinsuke {
5546e6b3f7cSQing Li 	struct llentry *ln;
55526deb882SAlexander V. Chernikov 	struct in6_addr *dst, *pdst, *psrc, src;
556743eee66SSUZUKI Shinsuke 	struct ifnet *ifp;
557686cdd19SJun-ichiro itojun Hagino 	struct nd_ifinfo *ndi = NULL;
55826deb882SAlexander V. Chernikov 	int send_ns;
55982cd038dSYoshinobu Inoue 
56019291ab3SBjoern A. Zeeb 	KASSERT(arg != NULL, ("%s: arg NULL", __func__));
5616e6b3f7cSQing Li 	ln = (struct llentry *)arg;
5622575fbb8SRandall Stewart 	LLE_WLOCK(ln);
5630447c136SAlexander V. Chernikov 	if (callout_pending(&ln->lle_timer)) {
5642575fbb8SRandall Stewart 		/*
5652575fbb8SRandall Stewart 		 * Here we are a bit odd here in the treatment of
5662575fbb8SRandall Stewart 		 * active/pending. If the pending bit is set, it got
5672575fbb8SRandall Stewart 		 * rescheduled before I ran. The active
5682575fbb8SRandall Stewart 		 * bit we ignore, since if it was stopped
5692575fbb8SRandall Stewart 		 * in ll_tablefree() and was currently running
5702575fbb8SRandall Stewart 		 * it would have return 0 so the code would
5712575fbb8SRandall Stewart 		 * not have deleted it since the callout could
5722575fbb8SRandall Stewart 		 * not be stopped so we want to go through
5732575fbb8SRandall Stewart 		 * with the delete here now. If the callout
5742575fbb8SRandall Stewart 		 * was restarted, the pending bit will be back on and
5752575fbb8SRandall Stewart 		 * we just want to bail since the callout_reset would
5762575fbb8SRandall Stewart 		 * return 1 and our reference would have been removed
5772575fbb8SRandall Stewart 		 * by nd6_llinfo_settimer_locked above since canceled
5782575fbb8SRandall Stewart 		 * would have been 1.
5792575fbb8SRandall Stewart 		 */
5802575fbb8SRandall Stewart 		LLE_WUNLOCK(ln);
5812575fbb8SRandall Stewart 		return;
5822575fbb8SRandall Stewart 	}
58319291ab3SBjoern A. Zeeb 	ifp = ln->lle_tbl->llt_ifp;
5846e6b3f7cSQing Li 	CURVNET_SET(ifp->if_vnet);
58526deb882SAlexander V. Chernikov 	ndi = ND_IFINFO(ifp);
58626deb882SAlexander V. Chernikov 	send_ns = 0;
58726deb882SAlexander V. Chernikov 	dst = &ln->r_l3addr.addr6;
58826deb882SAlexander V. Chernikov 	pdst = dst;
58982cd038dSYoshinobu Inoue 
590743eee66SSUZUKI Shinsuke 	if (ln->ln_ntick > 0) {
591743eee66SSUZUKI Shinsuke 		if (ln->ln_ntick > INT_MAX) {
592743eee66SSUZUKI Shinsuke 			ln->ln_ntick -= INT_MAX;
593e6950476SBjoern A. Zeeb 			nd6_llinfo_settimer_locked(ln, INT_MAX);
594743eee66SSUZUKI Shinsuke 		} else {
595743eee66SSUZUKI Shinsuke 			ln->ln_ntick = 0;
596e6950476SBjoern A. Zeeb 			nd6_llinfo_settimer_locked(ln, ln->ln_ntick);
59782cd038dSYoshinobu Inoue 		}
5986e6b3f7cSQing Li 		goto done;
599743eee66SSUZUKI Shinsuke 	}
600743eee66SSUZUKI Shinsuke 
601287e3cb4SHajimu UMEMOTO 	if (ln->la_flags & LLE_STATIC) {
6026e6b3f7cSQing Li 		goto done;
6036e6b3f7cSQing Li 	}
60482cd038dSYoshinobu Inoue 
6056e6b3f7cSQing Li 	if (ln->la_flags & LLE_DELETED) {
606d3cdb716SAlexander V. Chernikov 		nd6_free(ln, 0);
6072eb10edcSHajimu UMEMOTO 		ln = NULL;
6086e6b3f7cSQing Li 		goto done;
6096e6b3f7cSQing Li 	}
61082cd038dSYoshinobu Inoue 
61182cd038dSYoshinobu Inoue 	switch (ln->ln_state) {
61282cd038dSYoshinobu Inoue 	case ND6_LLINFO_INCOMPLETE:
6136e6b3f7cSQing Li 		if (ln->la_asked < V_nd6_mmaxtries) {
6146e6b3f7cSQing Li 			ln->la_asked++;
61526deb882SAlexander V. Chernikov 			send_ns = 1;
61626deb882SAlexander V. Chernikov 			/* Send NS to multicast address */
61726deb882SAlexander V. Chernikov 			pdst = NULL;
61882cd038dSYoshinobu Inoue 		} else {
6196e6b3f7cSQing Li 			struct mbuf *m = ln->la_hold;
62082cd038dSYoshinobu Inoue 			if (m) {
62131d4137bSSUZUKI Shinsuke 				struct mbuf *m0;
62231d4137bSSUZUKI Shinsuke 
62382cd038dSYoshinobu Inoue 				/*
6246e6b3f7cSQing Li 				 * assuming every packet in la_hold has the
625e6950476SBjoern A. Zeeb 				 * same IP header.  Send error after unlock.
62682cd038dSYoshinobu Inoue 				 */
62731d4137bSSUZUKI Shinsuke 				m0 = m->m_nextpkt;
62831d4137bSSUZUKI Shinsuke 				m->m_nextpkt = NULL;
6296e6b3f7cSQing Li 				ln->la_hold = m0;
63031d4137bSSUZUKI Shinsuke 				clear_llinfo_pqueue(ln);
63182cd038dSYoshinobu Inoue 			}
63263a97a40SNavdeep Parhar 			EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_TIMEDOUT);
633d3cdb716SAlexander V. Chernikov 			nd6_free(ln, 0);
634743eee66SSUZUKI Shinsuke 			ln = NULL;
635e6950476SBjoern A. Zeeb 			if (m != NULL)
636e6950476SBjoern A. Zeeb 				icmp6_error2(m, ICMP6_DST_UNREACH,
637e6950476SBjoern A. Zeeb 				    ICMP6_DST_UNREACH_ADDR, 0, ifp);
63882cd038dSYoshinobu Inoue 		}
63982cd038dSYoshinobu Inoue 		break;
64082cd038dSYoshinobu Inoue 	case ND6_LLINFO_REACHABLE:
641743eee66SSUZUKI Shinsuke 		if (!ND6_LLINFO_PERMANENT(ln)) {
64282cd038dSYoshinobu Inoue 			ln->ln_state = ND6_LLINFO_STALE;
643e6950476SBjoern A. Zeeb 			nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
64433841545SHajimu UMEMOTO 		}
64582cd038dSYoshinobu Inoue 		break;
64633841545SHajimu UMEMOTO 
64733841545SHajimu UMEMOTO 	case ND6_LLINFO_STALE:
64833841545SHajimu UMEMOTO 		/* Garbage Collection(RFC 2461 5.3) */
649743eee66SSUZUKI Shinsuke 		if (!ND6_LLINFO_PERMANENT(ln)) {
65063a97a40SNavdeep Parhar 			EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_EXPIRED);
651d3cdb716SAlexander V. Chernikov 			nd6_free(ln, 1);
652743eee66SSUZUKI Shinsuke 			ln = NULL;
653743eee66SSUZUKI Shinsuke 		}
65433841545SHajimu UMEMOTO 		break;
65533841545SHajimu UMEMOTO 
65682cd038dSYoshinobu Inoue 	case ND6_LLINFO_DELAY:
657686cdd19SJun-ichiro itojun Hagino 		if (ndi && (ndi->flags & ND6_IFF_PERFORMNUD) != 0) {
658686cdd19SJun-ichiro itojun Hagino 			/* We need NUD */
6596e6b3f7cSQing Li 			ln->la_asked = 1;
66082cd038dSYoshinobu Inoue 			ln->ln_state = ND6_LLINFO_PROBE;
66126deb882SAlexander V. Chernikov 			send_ns = 1;
66233841545SHajimu UMEMOTO 		} else {
663686cdd19SJun-ichiro itojun Hagino 			ln->ln_state = ND6_LLINFO_STALE; /* XXX */
664e6950476SBjoern A. Zeeb 			nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
66533841545SHajimu UMEMOTO 		}
66682cd038dSYoshinobu Inoue 		break;
66782cd038dSYoshinobu Inoue 	case ND6_LLINFO_PROBE:
6686e6b3f7cSQing Li 		if (ln->la_asked < V_nd6_umaxtries) {
6696e6b3f7cSQing Li 			ln->la_asked++;
67026deb882SAlexander V. Chernikov 			send_ns = 1;
67182cd038dSYoshinobu Inoue 		} else {
67263a97a40SNavdeep Parhar 			EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_EXPIRED);
673d3cdb716SAlexander V. Chernikov 			nd6_free(ln, 0);
674743eee66SSUZUKI Shinsuke 			ln = NULL;
67582cd038dSYoshinobu Inoue 		}
67682cd038dSYoshinobu Inoue 		break;
677e6950476SBjoern A. Zeeb 	default:
678e6950476SBjoern A. Zeeb 		panic("%s: paths in a dark night can be confusing: %d",
679e6950476SBjoern A. Zeeb 		    __func__, ln->ln_state);
68082cd038dSYoshinobu Inoue 	}
6816e6b3f7cSQing Li done:
68226deb882SAlexander V. Chernikov 	if (send_ns != 0) {
68326deb882SAlexander V. Chernikov 		nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
68426deb882SAlexander V. Chernikov 		psrc = nd6_llinfo_get_holdsrc(ln, &src);
68526deb882SAlexander V. Chernikov 		LLE_FREE_LOCKED(ln);
68626deb882SAlexander V. Chernikov 		ln = NULL;
68726deb882SAlexander V. Chernikov 		nd6_ns_output(ifp, psrc, pdst, dst, NULL);
68826deb882SAlexander V. Chernikov 	}
68926deb882SAlexander V. Chernikov 
6906e6b3f7cSQing Li 	if (ln != NULL)
691e6950476SBjoern A. Zeeb 		LLE_FREE_LOCKED(ln);
692f0c0b143SHajimu UMEMOTO 	CURVNET_RESTORE();
69382cd038dSYoshinobu Inoue }
69482cd038dSYoshinobu Inoue 
695743eee66SSUZUKI Shinsuke 
696743eee66SSUZUKI Shinsuke /*
697743eee66SSUZUKI Shinsuke  * ND6 timer routine to expire default route list and prefix list
698743eee66SSUZUKI Shinsuke  */
699743eee66SSUZUKI Shinsuke void
7008b615593SMarko Zec nd6_timer(void *arg)
701743eee66SSUZUKI Shinsuke {
70221ca7b57SMarko Zec 	CURVNET_SET((struct vnet *) arg);
7033b0b2840SJohn Baldwin 	struct nd_defrouter *dr, *ndr;
7043b0b2840SJohn Baldwin 	struct nd_prefix *pr, *npr;
705743eee66SSUZUKI Shinsuke 	struct in6_ifaddr *ia6, *nia6;
706743eee66SSUZUKI Shinsuke 
707603724d3SBjoern A. Zeeb 	callout_reset(&V_nd6_timer_ch, V_nd6_prune * hz,
708f6dfe47aSMarko Zec 	    nd6_timer, curvnet);
709743eee66SSUZUKI Shinsuke 
71033841545SHajimu UMEMOTO 	/* expire default router list */
7113b0b2840SJohn Baldwin 	TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
7127d26db17SHiroki Sato 		if (dr->expire && dr->expire < time_uptime)
71382cd038dSYoshinobu Inoue 			defrtrlist_del(dr);
714686cdd19SJun-ichiro itojun Hagino 	}
71582cd038dSYoshinobu Inoue 
71633841545SHajimu UMEMOTO 	/*
71733841545SHajimu UMEMOTO 	 * expire interface addresses.
71833841545SHajimu UMEMOTO 	 * in the past the loop was inside prefix expiry processing.
71933841545SHajimu UMEMOTO 	 * However, from a stricter speci-confrmance standpoint, we should
72033841545SHajimu UMEMOTO 	 * rather separate address lifetimes and prefix lifetimes.
721d1da0a06SRobert Watson 	 *
722d1da0a06SRobert Watson 	 * XXXRW: in6_ifaddrhead locking.
72333841545SHajimu UMEMOTO 	 */
72433841545SHajimu UMEMOTO   addrloop:
72580af0152SRobert Watson 	TAILQ_FOREACH_SAFE(ia6, &V_in6_ifaddrhead, ia_link, nia6) {
72682cd038dSYoshinobu Inoue 		/* check address lifetime */
72733841545SHajimu UMEMOTO 		if (IFA6_IS_INVALID(ia6)) {
72833841545SHajimu UMEMOTO 			int regen = 0;
72933841545SHajimu UMEMOTO 
73033841545SHajimu UMEMOTO 			/*
73133841545SHajimu UMEMOTO 			 * If the expiring address is temporary, try
73233841545SHajimu UMEMOTO 			 * regenerating a new one.  This would be useful when
73388ff5695SSUZUKI Shinsuke 			 * we suspended a laptop PC, then turned it on after a
73433841545SHajimu UMEMOTO 			 * period that could invalidate all temporary
73533841545SHajimu UMEMOTO 			 * addresses.  Although we may have to restart the
73633841545SHajimu UMEMOTO 			 * loop (see below), it must be after purging the
73733841545SHajimu UMEMOTO 			 * address.  Otherwise, we'd see an infinite loop of
73833841545SHajimu UMEMOTO 			 * regeneration.
73933841545SHajimu UMEMOTO 			 */
740603724d3SBjoern A. Zeeb 			if (V_ip6_use_tempaddr &&
74133841545SHajimu UMEMOTO 			    (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
74233841545SHajimu UMEMOTO 				if (regen_tmpaddr(ia6) == 0)
74333841545SHajimu UMEMOTO 					regen = 1;
74433841545SHajimu UMEMOTO 			}
74533841545SHajimu UMEMOTO 
74633841545SHajimu UMEMOTO 			in6_purgeaddr(&ia6->ia_ifa);
74733841545SHajimu UMEMOTO 
74833841545SHajimu UMEMOTO 			if (regen)
74933841545SHajimu UMEMOTO 				goto addrloop; /* XXX: see below */
75043068328SHajimu UMEMOTO 		} else if (IFA6_IS_DEPRECATED(ia6)) {
75133841545SHajimu UMEMOTO 			int oldflags = ia6->ia6_flags;
75233841545SHajimu UMEMOTO 
75382cd038dSYoshinobu Inoue 			ia6->ia6_flags |= IN6_IFF_DEPRECATED;
75433841545SHajimu UMEMOTO 
75533841545SHajimu UMEMOTO 			/*
75633841545SHajimu UMEMOTO 			 * If a temporary address has just become deprecated,
75733841545SHajimu UMEMOTO 			 * regenerate a new one if possible.
75833841545SHajimu UMEMOTO 			 */
759603724d3SBjoern A. Zeeb 			if (V_ip6_use_tempaddr &&
76033841545SHajimu UMEMOTO 			    (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
76133841545SHajimu UMEMOTO 			    (oldflags & IN6_IFF_DEPRECATED) == 0) {
76233841545SHajimu UMEMOTO 
76333841545SHajimu UMEMOTO 				if (regen_tmpaddr(ia6) == 0) {
76433841545SHajimu UMEMOTO 					/*
76533841545SHajimu UMEMOTO 					 * A new temporary address is
76633841545SHajimu UMEMOTO 					 * generated.
76733841545SHajimu UMEMOTO 					 * XXX: this means the address chain
76833841545SHajimu UMEMOTO 					 * has changed while we are still in
76933841545SHajimu UMEMOTO 					 * the loop.  Although the change
77033841545SHajimu UMEMOTO 					 * would not cause disaster (because
77188ff5695SSUZUKI Shinsuke 					 * it's not a deletion, but an
77288ff5695SSUZUKI Shinsuke 					 * addition,) we'd rather restart the
77333841545SHajimu UMEMOTO 					 * loop just for safety.  Or does this
77433841545SHajimu UMEMOTO 					 * significantly reduce performance??
77533841545SHajimu UMEMOTO 					 */
77633841545SHajimu UMEMOTO 					goto addrloop;
77733841545SHajimu UMEMOTO 				}
77833841545SHajimu UMEMOTO 			}
77983649f07SHajimu UMEMOTO 		} else {
78033841545SHajimu UMEMOTO 			/*
78133841545SHajimu UMEMOTO 			 * A new RA might have made a deprecated address
78233841545SHajimu UMEMOTO 			 * preferred.
78333841545SHajimu UMEMOTO 			 */
78433841545SHajimu UMEMOTO 			ia6->ia6_flags &= ~IN6_IFF_DEPRECATED;
78582cd038dSYoshinobu Inoue 		}
78682cd038dSYoshinobu Inoue 	}
78782cd038dSYoshinobu Inoue 
78833841545SHajimu UMEMOTO 	/* expire prefix list */
7893b0b2840SJohn Baldwin 	LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, npr) {
79082cd038dSYoshinobu Inoue 		/*
79182cd038dSYoshinobu Inoue 		 * check prefix lifetime.
79282cd038dSYoshinobu Inoue 		 * since pltime is just for autoconf, pltime processing for
79382cd038dSYoshinobu Inoue 		 * prefix is not necessary.
79482cd038dSYoshinobu Inoue 		 */
795743eee66SSUZUKI Shinsuke 		if (pr->ndpr_vltime != ND6_INFINITE_LIFETIME &&
7967d26db17SHiroki Sato 		    time_uptime - pr->ndpr_lastupdate > pr->ndpr_vltime) {
79782cd038dSYoshinobu Inoue 
79882cd038dSYoshinobu Inoue 			/*
79982cd038dSYoshinobu Inoue 			 * address expiration and prefix expiration are
80033841545SHajimu UMEMOTO 			 * separate.  NEVER perform in6_purgeaddr here.
80182cd038dSYoshinobu Inoue 			 */
80282cd038dSYoshinobu Inoue 			prelist_remove(pr);
8033b0b2840SJohn Baldwin 		}
80482cd038dSYoshinobu Inoue 	}
8058b615593SMarko Zec 	CURVNET_RESTORE();
80682cd038dSYoshinobu Inoue }
80782cd038dSYoshinobu Inoue 
8081272577eSXin LI /*
8091272577eSXin LI  * ia6 - deprecated/invalidated temporary address
8101272577eSXin LI  */
81133841545SHajimu UMEMOTO static int
8121272577eSXin LI regen_tmpaddr(struct in6_ifaddr *ia6)
81333841545SHajimu UMEMOTO {
81433841545SHajimu UMEMOTO 	struct ifaddr *ifa;
81533841545SHajimu UMEMOTO 	struct ifnet *ifp;
81633841545SHajimu UMEMOTO 	struct in6_ifaddr *public_ifa6 = NULL;
81733841545SHajimu UMEMOTO 
81833841545SHajimu UMEMOTO 	ifp = ia6->ia_ifa.ifa_ifp;
819137f91e8SJohn Baldwin 	IF_ADDR_RLOCK(ifp);
820c4dd3fe1SRobert Watson 	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
82133841545SHajimu UMEMOTO 		struct in6_ifaddr *it6;
82233841545SHajimu UMEMOTO 
82333841545SHajimu UMEMOTO 		if (ifa->ifa_addr->sa_family != AF_INET6)
82433841545SHajimu UMEMOTO 			continue;
82533841545SHajimu UMEMOTO 
82633841545SHajimu UMEMOTO 		it6 = (struct in6_ifaddr *)ifa;
82733841545SHajimu UMEMOTO 
82833841545SHajimu UMEMOTO 		/* ignore no autoconf addresses. */
82933841545SHajimu UMEMOTO 		if ((it6->ia6_flags & IN6_IFF_AUTOCONF) == 0)
83033841545SHajimu UMEMOTO 			continue;
83133841545SHajimu UMEMOTO 
83233841545SHajimu UMEMOTO 		/* ignore autoconf addresses with different prefixes. */
83333841545SHajimu UMEMOTO 		if (it6->ia6_ndpr == NULL || it6->ia6_ndpr != ia6->ia6_ndpr)
83433841545SHajimu UMEMOTO 			continue;
83533841545SHajimu UMEMOTO 
83633841545SHajimu UMEMOTO 		/*
83733841545SHajimu UMEMOTO 		 * Now we are looking at an autoconf address with the same
83833841545SHajimu UMEMOTO 		 * prefix as ours.  If the address is temporary and is still
83933841545SHajimu UMEMOTO 		 * preferred, do not create another one.  It would be rare, but
84033841545SHajimu UMEMOTO 		 * could happen, for example, when we resume a laptop PC after
84133841545SHajimu UMEMOTO 		 * a long period.
84233841545SHajimu UMEMOTO 		 */
84333841545SHajimu UMEMOTO 		if ((it6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
84433841545SHajimu UMEMOTO 		    !IFA6_IS_DEPRECATED(it6)) {
84533841545SHajimu UMEMOTO 			public_ifa6 = NULL;
84633841545SHajimu UMEMOTO 			break;
84733841545SHajimu UMEMOTO 		}
84833841545SHajimu UMEMOTO 
84933841545SHajimu UMEMOTO 		/*
85033841545SHajimu UMEMOTO 		 * This is a public autoconf address that has the same prefix
85133841545SHajimu UMEMOTO 		 * as ours.  If it is preferred, keep it.  We can't break the
85233841545SHajimu UMEMOTO 		 * loop here, because there may be a still-preferred temporary
85333841545SHajimu UMEMOTO 		 * address with the prefix.
85433841545SHajimu UMEMOTO 		 */
85533841545SHajimu UMEMOTO 		if (!IFA6_IS_DEPRECATED(it6))
85633841545SHajimu UMEMOTO 			public_ifa6 = it6;
857dff78447SMark Johnston 	}
858c1752bcdSQing Li 	if (public_ifa6 != NULL)
859c1752bcdSQing Li 		ifa_ref(&public_ifa6->ia_ifa);
860137f91e8SJohn Baldwin 	IF_ADDR_RUNLOCK(ifp);
86133841545SHajimu UMEMOTO 
86233841545SHajimu UMEMOTO 	if (public_ifa6 != NULL) {
86333841545SHajimu UMEMOTO 		int e;
86433841545SHajimu UMEMOTO 
865743eee66SSUZUKI Shinsuke 		if ((e = in6_tmpifadd(public_ifa6, 0, 0)) != 0) {
866c1752bcdSQing Li 			ifa_free(&public_ifa6->ia_ifa);
86733841545SHajimu UMEMOTO 			log(LOG_NOTICE, "regen_tmpaddr: failed to create a new"
86833841545SHajimu UMEMOTO 			    " tmp addr,errno=%d\n", e);
86933841545SHajimu UMEMOTO 			return (-1);
87033841545SHajimu UMEMOTO 		}
871c1752bcdSQing Li 		ifa_free(&public_ifa6->ia_ifa);
87233841545SHajimu UMEMOTO 		return (0);
87333841545SHajimu UMEMOTO 	}
87433841545SHajimu UMEMOTO 
87533841545SHajimu UMEMOTO 	return (-1);
87633841545SHajimu UMEMOTO }
87733841545SHajimu UMEMOTO 
878686cdd19SJun-ichiro itojun Hagino /*
879686cdd19SJun-ichiro itojun Hagino  * Nuke neighbor cache/prefix/default router management table, right before
880686cdd19SJun-ichiro itojun Hagino  * ifp goes away.
881686cdd19SJun-ichiro itojun Hagino  */
882686cdd19SJun-ichiro itojun Hagino void
8831272577eSXin LI nd6_purge(struct ifnet *ifp)
884686cdd19SJun-ichiro itojun Hagino {
885743eee66SSUZUKI Shinsuke 	struct nd_defrouter *dr, *ndr;
886686cdd19SJun-ichiro itojun Hagino 	struct nd_prefix *pr, *npr;
887686cdd19SJun-ichiro itojun Hagino 
888686cdd19SJun-ichiro itojun Hagino 	/*
889743eee66SSUZUKI Shinsuke 	 * Nuke default router list entries toward ifp.
890743eee66SSUZUKI Shinsuke 	 * We defer removal of default router list entries that is installed
891743eee66SSUZUKI Shinsuke 	 * in the routing table, in order to keep additional side effects as
892743eee66SSUZUKI Shinsuke 	 * small as possible.
893686cdd19SJun-ichiro itojun Hagino 	 */
8943b0b2840SJohn Baldwin 	TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
895743eee66SSUZUKI Shinsuke 		if (dr->installed)
896743eee66SSUZUKI Shinsuke 			continue;
897743eee66SSUZUKI Shinsuke 
898686cdd19SJun-ichiro itojun Hagino 		if (dr->ifp == ifp)
899686cdd19SJun-ichiro itojun Hagino 			defrtrlist_del(dr);
900686cdd19SJun-ichiro itojun Hagino 	}
901743eee66SSUZUKI Shinsuke 
9023b0b2840SJohn Baldwin 	TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
903743eee66SSUZUKI Shinsuke 		if (!dr->installed)
904743eee66SSUZUKI Shinsuke 			continue;
905743eee66SSUZUKI Shinsuke 
906686cdd19SJun-ichiro itojun Hagino 		if (dr->ifp == ifp)
907686cdd19SJun-ichiro itojun Hagino 			defrtrlist_del(dr);
908686cdd19SJun-ichiro itojun Hagino 	}
909686cdd19SJun-ichiro itojun Hagino 
910686cdd19SJun-ichiro itojun Hagino 	/* Nuke prefix list entries toward ifp */
9113b0b2840SJohn Baldwin 	LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, npr) {
912686cdd19SJun-ichiro itojun Hagino 		if (pr->ndpr_ifp == ifp) {
91333841545SHajimu UMEMOTO 			/*
914743eee66SSUZUKI Shinsuke 			 * Because if_detach() does *not* release prefixes
915743eee66SSUZUKI Shinsuke 			 * while purging addresses the reference count will
916743eee66SSUZUKI Shinsuke 			 * still be above zero. We therefore reset it to
917743eee66SSUZUKI Shinsuke 			 * make sure that the prefix really gets purged.
918743eee66SSUZUKI Shinsuke 			 */
919743eee66SSUZUKI Shinsuke 			pr->ndpr_refcnt = 0;
920743eee66SSUZUKI Shinsuke 
921743eee66SSUZUKI Shinsuke 			/*
92233841545SHajimu UMEMOTO 			 * Previously, pr->ndpr_addr is removed as well,
92333841545SHajimu UMEMOTO 			 * but I strongly believe we don't have to do it.
92433841545SHajimu UMEMOTO 			 * nd6_purge() is only called from in6_ifdetach(),
92533841545SHajimu UMEMOTO 			 * which removes all the associated interface addresses
92633841545SHajimu UMEMOTO 			 * by itself.
92733841545SHajimu UMEMOTO 			 * (jinmei@kame.net 20010129)
92833841545SHajimu UMEMOTO 			 */
929686cdd19SJun-ichiro itojun Hagino 			prelist_remove(pr);
930686cdd19SJun-ichiro itojun Hagino 		}
931686cdd19SJun-ichiro itojun Hagino 	}
932686cdd19SJun-ichiro itojun Hagino 
933686cdd19SJun-ichiro itojun Hagino 	/* cancel default outgoing interface setting */
934603724d3SBjoern A. Zeeb 	if (V_nd6_defifindex == ifp->if_index)
935686cdd19SJun-ichiro itojun Hagino 		nd6_setdefaultiface(0);
936686cdd19SJun-ichiro itojun Hagino 
937e7fa8d0aSHiroki Sato 	if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
938a283298cSHiroki Sato 		/* Refresh default router list. */
939686cdd19SJun-ichiro itojun Hagino 		defrouter_select();
9406e6b3f7cSQing Li 	}
9416e6b3f7cSQing Li 
9426e6b3f7cSQing Li 	/* XXXXX
9436e6b3f7cSQing Li 	 * We do not nuke the neighbor cache entries here any more
9446e6b3f7cSQing Li 	 * because the neighbor cache is kept in if_afdata[AF_INET6].
9456e6b3f7cSQing Li 	 * nd6_purge() is invoked by in6_ifdetach() which is called
9466e6b3f7cSQing Li 	 * from if_detach() where everything gets purged. So let
9476e6b3f7cSQing Li 	 * in6_domifdetach() do the actual L2 table purging work.
9486e6b3f7cSQing Li 	 */
9491026ccc4SHajimu UMEMOTO }
950686cdd19SJun-ichiro itojun Hagino 
951686cdd19SJun-ichiro itojun Hagino /*
9526e6b3f7cSQing Li  * the caller acquires and releases the lock on the lltbls
9536e6b3f7cSQing Li  * Returns the llentry locked
954686cdd19SJun-ichiro itojun Hagino  */
9556e6b3f7cSQing Li struct llentry *
956f0316e1aSAlexander V. Chernikov nd6_lookup(const struct in6_addr *addr6, int flags, struct ifnet *ifp)
95782cd038dSYoshinobu Inoue {
95882cd038dSYoshinobu Inoue 	struct sockaddr_in6 sin6;
9596e6b3f7cSQing Li 	struct llentry *ln;
96068352503SBjoern A. Zeeb 	int llflags;
96182cd038dSYoshinobu Inoue 
96282cd038dSYoshinobu Inoue 	bzero(&sin6, sizeof(sin6));
96382cd038dSYoshinobu Inoue 	sin6.sin6_len = sizeof(struct sockaddr_in6);
96482cd038dSYoshinobu Inoue 	sin6.sin6_family = AF_INET6;
96582cd038dSYoshinobu Inoue 	sin6.sin6_addr = *addr6;
966686cdd19SJun-ichiro itojun Hagino 
9676e6b3f7cSQing Li 	IF_AFDATA_LOCK_ASSERT(ifp);
96882cd038dSYoshinobu Inoue 
969b4b1367aSAlexander V. Chernikov 	llflags = (flags & ND6_EXCLUSIVE) ? LLE_EXCLUSIVE : 0;
9706e6b3f7cSQing Li 	ln = lla_lookup(LLTABLE6(ifp), llflags, (struct sockaddr *)&sin6);
971b4b1367aSAlexander V. Chernikov 
972b4b1367aSAlexander V. Chernikov 	return (ln);
973b4b1367aSAlexander V. Chernikov }
974b4b1367aSAlexander V. Chernikov 
975b4b1367aSAlexander V. Chernikov struct llentry *
976f0316e1aSAlexander V. Chernikov nd6_alloc(const struct in6_addr *addr6, int flags, struct ifnet *ifp)
977b4b1367aSAlexander V. Chernikov {
978b4b1367aSAlexander V. Chernikov 	struct sockaddr_in6 sin6;
979b4b1367aSAlexander V. Chernikov 	struct llentry *ln;
980b4b1367aSAlexander V. Chernikov 
981b4b1367aSAlexander V. Chernikov 	bzero(&sin6, sizeof(sin6));
982b4b1367aSAlexander V. Chernikov 	sin6.sin6_len = sizeof(struct sockaddr_in6);
983b4b1367aSAlexander V. Chernikov 	sin6.sin6_family = AF_INET6;
984b4b1367aSAlexander V. Chernikov 	sin6.sin6_addr = *addr6;
985b4b1367aSAlexander V. Chernikov 
9865a255516SAlexander V. Chernikov 	ln = lltable_alloc_entry(LLTABLE6(ifp), 0, (struct sockaddr *)&sin6);
987b4b1367aSAlexander V. Chernikov 	if (ln != NULL)
98882cd038dSYoshinobu Inoue 		ln->ln_state = ND6_LLINFO_NOSTATE;
9896e6b3f7cSQing Li 
9906e6b3f7cSQing Li 	return (ln);
99182cd038dSYoshinobu Inoue }
99282cd038dSYoshinobu Inoue 
99382cd038dSYoshinobu Inoue /*
99477b691e0SBrian Feldman  * Test whether a given IPv6 address is a neighbor or not, ignoring
99577b691e0SBrian Feldman  * the actual neighbor cache.  The neighbor cache is ignored in order
99677b691e0SBrian Feldman  * to not reenter the routing code from within itself.
99782cd038dSYoshinobu Inoue  */
99877b691e0SBrian Feldman static int
999f0316e1aSAlexander V. Chernikov nd6_is_new_addr_neighbor(const struct sockaddr_in6 *addr, struct ifnet *ifp)
100082cd038dSYoshinobu Inoue {
10014208ea14SHajimu UMEMOTO 	struct nd_prefix *pr;
1002743eee66SSUZUKI Shinsuke 	struct ifaddr *dstaddr;
100382cd038dSYoshinobu Inoue 
1004686cdd19SJun-ichiro itojun Hagino 	/*
1005686cdd19SJun-ichiro itojun Hagino 	 * A link-local address is always a neighbor.
10064208ea14SHajimu UMEMOTO 	 * XXX: a link does not necessarily specify a single interface.
1007686cdd19SJun-ichiro itojun Hagino 	 */
1008a1f7e5f8SHajimu UMEMOTO 	if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr)) {
1009a1f7e5f8SHajimu UMEMOTO 		struct sockaddr_in6 sin6_copy;
1010a1f7e5f8SHajimu UMEMOTO 		u_int32_t zone;
1011a1f7e5f8SHajimu UMEMOTO 
1012a1f7e5f8SHajimu UMEMOTO 		/*
1013a1f7e5f8SHajimu UMEMOTO 		 * We need sin6_copy since sa6_recoverscope() may modify the
1014a1f7e5f8SHajimu UMEMOTO 		 * content (XXX).
1015a1f7e5f8SHajimu UMEMOTO 		 */
1016a1f7e5f8SHajimu UMEMOTO 		sin6_copy = *addr;
1017a1f7e5f8SHajimu UMEMOTO 		if (sa6_recoverscope(&sin6_copy))
1018a1f7e5f8SHajimu UMEMOTO 			return (0); /* XXX: should be impossible */
1019a1f7e5f8SHajimu UMEMOTO 		if (in6_setscope(&sin6_copy.sin6_addr, ifp, &zone))
1020a1f7e5f8SHajimu UMEMOTO 			return (0);
1021a1f7e5f8SHajimu UMEMOTO 		if (sin6_copy.sin6_scope_id == zone)
102282cd038dSYoshinobu Inoue 			return (1);
1023a1f7e5f8SHajimu UMEMOTO 		else
1024a1f7e5f8SHajimu UMEMOTO 			return (0);
1025a1f7e5f8SHajimu UMEMOTO 	}
102682cd038dSYoshinobu Inoue 
102782cd038dSYoshinobu Inoue 	/*
102882cd038dSYoshinobu Inoue 	 * If the address matches one of our addresses,
102982cd038dSYoshinobu Inoue 	 * it should be a neighbor.
10304208ea14SHajimu UMEMOTO 	 * If the address matches one of our on-link prefixes, it should be a
10314208ea14SHajimu UMEMOTO 	 * neighbor.
103282cd038dSYoshinobu Inoue 	 */
10333b0b2840SJohn Baldwin 	LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
10344208ea14SHajimu UMEMOTO 		if (pr->ndpr_ifp != ifp)
10354208ea14SHajimu UMEMOTO 			continue;
103682cd038dSYoshinobu Inoue 
1037baf7c373SQing Li 		if (!(pr->ndpr_stateflags & NDPRF_ONLINK)) {
1038baf7c373SQing Li 			struct rtentry *rt;
103981d5d46bSBjoern A. Zeeb 
104081d5d46bSBjoern A. Zeeb 			/* Always use the default FIB here. */
104181d5d46bSBjoern A. Zeeb 			rt = in6_rtalloc1((struct sockaddr *)&pr->ndpr_prefix,
104281d5d46bSBjoern A. Zeeb 			    0, 0, RT_DEFAULT_FIB);
1043baf7c373SQing Li 			if (rt == NULL)
10444208ea14SHajimu UMEMOTO 				continue;
1045baf7c373SQing Li 			/*
1046baf7c373SQing Li 			 * This is the case where multiple interfaces
1047baf7c373SQing Li 			 * have the same prefix, but only one is installed
1048baf7c373SQing Li 			 * into the routing table and that prefix entry
1049baf7c373SQing Li 			 * is not the one being examined here. In the case
1050baf7c373SQing Li 			 * where RADIX_MPATH is enabled, multiple route
1051baf7c373SQing Li 			 * entries (of the same rt_key value) will be
1052baf7c373SQing Li 			 * installed because the interface addresses all
1053baf7c373SQing Li 			 * differ.
1054baf7c373SQing Li 			 */
1055baf7c373SQing Li 			if (!IN6_ARE_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr,
1056baf7c373SQing Li 			       &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr)) {
1057baf7c373SQing Li 				RTFREE_LOCKED(rt);
1058baf7c373SQing Li 				continue;
1059baf7c373SQing Li 			}
1060baf7c373SQing Li 			RTFREE_LOCKED(rt);
1061baf7c373SQing Li 		}
10624208ea14SHajimu UMEMOTO 
10634208ea14SHajimu UMEMOTO 		if (IN6_ARE_MASKED_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr,
10644208ea14SHajimu UMEMOTO 		    &addr->sin6_addr, &pr->ndpr_mask))
10654208ea14SHajimu UMEMOTO 			return (1);
106682cd038dSYoshinobu Inoue 	}
10674208ea14SHajimu UMEMOTO 
10684208ea14SHajimu UMEMOTO 	/*
1069743eee66SSUZUKI Shinsuke 	 * If the address is assigned on the node of the other side of
1070743eee66SSUZUKI Shinsuke 	 * a p2p interface, the address should be a neighbor.
1071743eee66SSUZUKI Shinsuke 	 */
1072f0316e1aSAlexander V. Chernikov 	dstaddr = ifa_ifwithdstaddr((const struct sockaddr *)addr, RT_ALL_FIBS);
10738c0fec80SRobert Watson 	if (dstaddr != NULL) {
10748c0fec80SRobert Watson 		if (dstaddr->ifa_ifp == ifp) {
10758c0fec80SRobert Watson 			ifa_free(dstaddr);
1076743eee66SSUZUKI Shinsuke 			return (1);
10778c0fec80SRobert Watson 		}
10788c0fec80SRobert Watson 		ifa_free(dstaddr);
10798c0fec80SRobert Watson 	}
1080743eee66SSUZUKI Shinsuke 
1081743eee66SSUZUKI Shinsuke 	/*
10824208ea14SHajimu UMEMOTO 	 * If the default router list is empty, all addresses are regarded
10834208ea14SHajimu UMEMOTO 	 * as on-link, and thus, as a neighbor.
10844208ea14SHajimu UMEMOTO 	 */
1085e7fa8d0aSHiroki Sato 	if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV &&
10863b0b2840SJohn Baldwin 	    TAILQ_EMPTY(&V_nd_defrouter) &&
1087603724d3SBjoern A. Zeeb 	    V_nd6_defifindex == ifp->if_index) {
108882cd038dSYoshinobu Inoue 		return (1);
108982cd038dSYoshinobu Inoue 	}
109082cd038dSYoshinobu Inoue 
109177b691e0SBrian Feldman 	return (0);
109277b691e0SBrian Feldman }
109377b691e0SBrian Feldman 
109477b691e0SBrian Feldman 
109577b691e0SBrian Feldman /*
109677b691e0SBrian Feldman  * Detect if a given IPv6 address identifies a neighbor on a given link.
109777b691e0SBrian Feldman  * XXX: should take care of the destination of a p2p link?
109877b691e0SBrian Feldman  */
109977b691e0SBrian Feldman int
1100f0316e1aSAlexander V. Chernikov nd6_is_addr_neighbor(const struct sockaddr_in6 *addr, struct ifnet *ifp)
110177b691e0SBrian Feldman {
11026e6b3f7cSQing Li 	struct llentry *lle;
11036e6b3f7cSQing Li 	int rc = 0;
110477b691e0SBrian Feldman 
11056e6b3f7cSQing Li 	IF_AFDATA_UNLOCK_ASSERT(ifp);
110677b691e0SBrian Feldman 	if (nd6_is_new_addr_neighbor(addr, ifp))
110777b691e0SBrian Feldman 		return (1);
110877b691e0SBrian Feldman 
110982cd038dSYoshinobu Inoue 	/*
111082cd038dSYoshinobu Inoue 	 * Even if the address matches none of our addresses, it might be
111182cd038dSYoshinobu Inoue 	 * in the neighbor cache.
111282cd038dSYoshinobu Inoue 	 */
111373cb2f38SAndrey V. Elsukov 	IF_AFDATA_RLOCK(ifp);
11146e6b3f7cSQing Li 	if ((lle = nd6_lookup(&addr->sin6_addr, 0, ifp)) != NULL) {
11156e6b3f7cSQing Li 		LLE_RUNLOCK(lle);
11166e6b3f7cSQing Li 		rc = 1;
11176e6b3f7cSQing Li 	}
111873cb2f38SAndrey V. Elsukov 	IF_AFDATA_RUNLOCK(ifp);
11196e6b3f7cSQing Li 	return (rc);
112082cd038dSYoshinobu Inoue }
112182cd038dSYoshinobu Inoue 
112282cd038dSYoshinobu Inoue /*
112382cd038dSYoshinobu Inoue  * Free an nd6 llinfo entry.
1124743eee66SSUZUKI Shinsuke  * Since the function would cause significant changes in the kernel, DO NOT
1125743eee66SSUZUKI Shinsuke  * make it global, unless you have a strong reason for the change, and are sure
1126743eee66SSUZUKI Shinsuke  * that the change is safe.
112782cd038dSYoshinobu Inoue  */
1128d3cdb716SAlexander V. Chernikov static void
11296e6b3f7cSQing Li nd6_free(struct llentry *ln, int gc)
113082cd038dSYoshinobu Inoue {
113182cd038dSYoshinobu Inoue 	struct nd_defrouter *dr;
1132e6950476SBjoern A. Zeeb 	struct ifnet *ifp;
1133e6950476SBjoern A. Zeeb 
1134e6950476SBjoern A. Zeeb 	LLE_WLOCK_ASSERT(ln);
113582cd038dSYoshinobu Inoue 
113682cd038dSYoshinobu Inoue 	/*
113733841545SHajimu UMEMOTO 	 * we used to have pfctlinput(PRC_HOSTDEAD) here.
113833841545SHajimu UMEMOTO 	 * even though it is not harmful, it was not really necessary.
113982cd038dSYoshinobu Inoue 	 */
1140686cdd19SJun-ichiro itojun Hagino 
1141743eee66SSUZUKI Shinsuke 	/* cancel timer */
1142e6950476SBjoern A. Zeeb 	nd6_llinfo_settimer_locked(ln, -1);
1143e6950476SBjoern A. Zeeb 
1144e6950476SBjoern A. Zeeb 	ifp = ln->lle_tbl->llt_ifp;
1145743eee66SSUZUKI Shinsuke 
1146e7fa8d0aSHiroki Sato 	if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
1147314294deSAlexander V. Chernikov 		dr = defrouter_lookup(&ln->r_l3addr.addr6, ifp);
114833841545SHajimu UMEMOTO 
1149743eee66SSUZUKI Shinsuke 		if (dr != NULL && dr->expire &&
1150743eee66SSUZUKI Shinsuke 		    ln->ln_state == ND6_LLINFO_STALE && gc) {
1151743eee66SSUZUKI Shinsuke 			/*
1152743eee66SSUZUKI Shinsuke 			 * If the reason for the deletion is just garbage
1153743eee66SSUZUKI Shinsuke 			 * collection, and the neighbor is an active default
1154743eee66SSUZUKI Shinsuke 			 * router, do not delete it.  Instead, reset the GC
1155743eee66SSUZUKI Shinsuke 			 * timer using the router's lifetime.
1156743eee66SSUZUKI Shinsuke 			 * Simply deleting the entry would affect default
1157743eee66SSUZUKI Shinsuke 			 * router selection, which is not necessarily a good
1158743eee66SSUZUKI Shinsuke 			 * thing, especially when we're using router preference
1159743eee66SSUZUKI Shinsuke 			 * values.
1160743eee66SSUZUKI Shinsuke 			 * XXX: the check for ln_state would be redundant,
1161743eee66SSUZUKI Shinsuke 			 *      but we intentionally keep it just in case.
1162743eee66SSUZUKI Shinsuke 			 */
11637d26db17SHiroki Sato 			if (dr->expire > time_uptime)
1164e6950476SBjoern A. Zeeb 				nd6_llinfo_settimer_locked(ln,
11657d26db17SHiroki Sato 				    (dr->expire - time_uptime) * hz);
1166743eee66SSUZUKI Shinsuke 			else
1167e6950476SBjoern A. Zeeb 				nd6_llinfo_settimer_locked(ln,
1168e6950476SBjoern A. Zeeb 				    (long)V_nd6_gctimer * hz);
1169e6950476SBjoern A. Zeeb 
1170ef8d671cSHajimu UMEMOTO 			LLE_REMREF(ln);
1171ef8d671cSHajimu UMEMOTO 			LLE_WUNLOCK(ln);
1172d3cdb716SAlexander V. Chernikov 			return;
1173743eee66SSUZUKI Shinsuke 		}
1174743eee66SSUZUKI Shinsuke 
1175686cdd19SJun-ichiro itojun Hagino 		if (dr) {
1176686cdd19SJun-ichiro itojun Hagino 			/*
1177686cdd19SJun-ichiro itojun Hagino 			 * Unreachablity of a router might affect the default
1178686cdd19SJun-ichiro itojun Hagino 			 * router selection and on-link detection of advertised
1179686cdd19SJun-ichiro itojun Hagino 			 * prefixes.
1180686cdd19SJun-ichiro itojun Hagino 			 */
1181686cdd19SJun-ichiro itojun Hagino 
1182686cdd19SJun-ichiro itojun Hagino 			/*
1183686cdd19SJun-ichiro itojun Hagino 			 * Temporarily fake the state to choose a new default
1184686cdd19SJun-ichiro itojun Hagino 			 * router and to perform on-link determination of
118588ff5695SSUZUKI Shinsuke 			 * prefixes correctly.
1186686cdd19SJun-ichiro itojun Hagino 			 * Below the state will be set correctly,
1187686cdd19SJun-ichiro itojun Hagino 			 * or the entry itself will be deleted.
1188686cdd19SJun-ichiro itojun Hagino 			 */
1189686cdd19SJun-ichiro itojun Hagino 			ln->ln_state = ND6_LLINFO_INCOMPLETE;
11901d5089c2SBjoern A. Zeeb 		}
1191686cdd19SJun-ichiro itojun Hagino 
11921d5089c2SBjoern A. Zeeb 		if (ln->ln_router || dr) {
11931d5089c2SBjoern A. Zeeb 
11941d5089c2SBjoern A. Zeeb 			/*
11951d5089c2SBjoern A. Zeeb 			 * We need to unlock to avoid a LOR with rt6_flush() with the
11961d5089c2SBjoern A. Zeeb 			 * rnh and for the calls to pfxlist_onlink_check() and
11971d5089c2SBjoern A. Zeeb 			 * defrouter_select() in the block further down for calls
11981d5089c2SBjoern A. Zeeb 			 * into nd6_lookup().  We still hold a ref.
11991d5089c2SBjoern A. Zeeb 			 */
12001d5089c2SBjoern A. Zeeb 			LLE_WUNLOCK(ln);
12011d5089c2SBjoern A. Zeeb 
12021d5089c2SBjoern A. Zeeb 			/*
12031d5089c2SBjoern A. Zeeb 			 * rt6_flush must be called whether or not the neighbor
12041d5089c2SBjoern A. Zeeb 			 * is in the Default Router List.
12051d5089c2SBjoern A. Zeeb 			 * See a corresponding comment in nd6_na_input().
12061d5089c2SBjoern A. Zeeb 			 */
1207314294deSAlexander V. Chernikov 			rt6_flush(&ln->r_l3addr.addr6, ifp);
12081d5089c2SBjoern A. Zeeb 		}
12091d5089c2SBjoern A. Zeeb 
12101d5089c2SBjoern A. Zeeb 		if (dr) {
121133841545SHajimu UMEMOTO 			/*
121233841545SHajimu UMEMOTO 			 * Since defrouter_select() does not affect the
121333841545SHajimu UMEMOTO 			 * on-link determination and MIP6 needs the check
121433841545SHajimu UMEMOTO 			 * before the default router selection, we perform
121533841545SHajimu UMEMOTO 			 * the check now.
121633841545SHajimu UMEMOTO 			 */
121733841545SHajimu UMEMOTO 			pfxlist_onlink_check();
121833841545SHajimu UMEMOTO 
1219686cdd19SJun-ichiro itojun Hagino 			/*
12201d5089c2SBjoern A. Zeeb 			 * Refresh default router list.
1221686cdd19SJun-ichiro itojun Hagino 			 */
1222686cdd19SJun-ichiro itojun Hagino 			defrouter_select();
1223686cdd19SJun-ichiro itojun Hagino 		}
12241d5089c2SBjoern A. Zeeb 
122517a03656SEric van Gyzen 		/*
122617a03656SEric van Gyzen 		 * If this entry was added by an on-link redirect, remove the
122717a03656SEric van Gyzen 		 * corresponding host route.
122817a03656SEric van Gyzen 		 */
122917a03656SEric van Gyzen 		if (ln->la_flags & LLE_REDIRECT)
123017a03656SEric van Gyzen 			nd6_free_redirect(ln);
123117a03656SEric van Gyzen 
12321d5089c2SBjoern A. Zeeb 		if (ln->ln_router || dr)
12331d5089c2SBjoern A. Zeeb 			LLE_WLOCK(ln);
123482cd038dSYoshinobu Inoue 	}
123582cd038dSYoshinobu Inoue 
123633841545SHajimu UMEMOTO 	/*
1237e6950476SBjoern A. Zeeb 	 * Save to unlock. We still hold an extra reference and will not
1238e6950476SBjoern A. Zeeb 	 * free(9) in llentry_free() if someone else holds one as well.
1239e6950476SBjoern A. Zeeb 	 */
1240e6950476SBjoern A. Zeeb 	LLE_WUNLOCK(ln);
12416e6b3f7cSQing Li 	IF_AFDATA_LOCK(ifp);
12426e6b3f7cSQing Li 	LLE_WLOCK(ln);
1243b1ec2940SGleb Smirnoff 	/* Guard against race with other llentry_free(). */
1244b1ec2940SGleb Smirnoff 	if (ln->la_flags & LLE_LINKED) {
1245d3cdb716SAlexander V. Chernikov 		/* Remove callout reference */
1246becba438SBjoern A. Zeeb 		LLE_REMREF(ln);
1247d3cdb716SAlexander V. Chernikov 		lltable_unlink_entry(ln->lle_tbl, ln);
1248d3cdb716SAlexander V. Chernikov 	}
12496e6b3f7cSQing Li 	IF_AFDATA_UNLOCK(ifp);
125033841545SHajimu UMEMOTO 
1251d3cdb716SAlexander V. Chernikov 	llentry_free(ln);
125282cd038dSYoshinobu Inoue }
125382cd038dSYoshinobu Inoue 
125482cd038dSYoshinobu Inoue /*
125517a03656SEric van Gyzen  * Remove the rtentry for the given llentry,
125617a03656SEric van Gyzen  * both of which were installed by a redirect.
125717a03656SEric van Gyzen  */
125817a03656SEric van Gyzen static void
125917a03656SEric van Gyzen nd6_free_redirect(const struct llentry *ln)
126017a03656SEric van Gyzen {
126117a03656SEric van Gyzen 	int fibnum;
126217a03656SEric van Gyzen 	struct rtentry *rt;
126317a03656SEric van Gyzen 	struct radix_node_head *rnh;
126417a03656SEric van Gyzen 	struct sockaddr_in6 sin6;
126517a03656SEric van Gyzen 
126617a03656SEric van Gyzen 	lltable_fill_sa_entry(ln, (struct sockaddr *)&sin6);
126717a03656SEric van Gyzen 	for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
126817a03656SEric van Gyzen 		rnh = rt_tables_get_rnh(fibnum, AF_INET6);
126917a03656SEric van Gyzen 		if (rnh == NULL)
127017a03656SEric van Gyzen 			continue;
127117a03656SEric van Gyzen 
127217a03656SEric van Gyzen 		RADIX_NODE_HEAD_LOCK(rnh);
127317a03656SEric van Gyzen 		rt = in6_rtalloc1((struct sockaddr *)&sin6, 0,
127417a03656SEric van Gyzen 		    RTF_RNH_LOCKED, fibnum);
127517a03656SEric van Gyzen 		if (rt) {
127617a03656SEric van Gyzen 			if (rt->rt_flags == (RTF_UP | RTF_HOST | RTF_DYNAMIC))
127717a03656SEric van Gyzen 				rt_expunge(rnh, rt);
127817a03656SEric van Gyzen 			RTFREE_LOCKED(rt);
127917a03656SEric van Gyzen 		}
128017a03656SEric van Gyzen 		RADIX_NODE_HEAD_UNLOCK(rnh);
128117a03656SEric van Gyzen 	}
128217a03656SEric van Gyzen }
128317a03656SEric van Gyzen 
128417a03656SEric van Gyzen /*
128582cd038dSYoshinobu Inoue  * Upper-layer reachability hint for Neighbor Unreachability Detection.
128682cd038dSYoshinobu Inoue  *
1287cd0fdcf7SHajimu UMEMOTO  * XXX cost-effective methods?
128882cd038dSYoshinobu Inoue  */
128982cd038dSYoshinobu Inoue void
12901272577eSXin LI nd6_nud_hint(struct rtentry *rt, struct in6_addr *dst6, int force)
129182cd038dSYoshinobu Inoue {
12926e6b3f7cSQing Li 	struct llentry *ln;
12936e6b3f7cSQing Li 	struct ifnet *ifp;
129482cd038dSYoshinobu Inoue 
12956e6b3f7cSQing Li 	if ((dst6 == NULL) || (rt == NULL))
129682cd038dSYoshinobu Inoue 		return;
129782cd038dSYoshinobu Inoue 
12986e6b3f7cSQing Li 	ifp = rt->rt_ifp;
1299ea0c3776SAndrey V. Elsukov 	IF_AFDATA_RLOCK(ifp);
13006e6b3f7cSQing Li 	ln = nd6_lookup(dst6, ND6_EXCLUSIVE, NULL);
1301ea0c3776SAndrey V. Elsukov 	IF_AFDATA_RUNLOCK(ifp);
13026e6b3f7cSQing Li 	if (ln == NULL)
130382cd038dSYoshinobu Inoue 		return;
130482cd038dSYoshinobu Inoue 
1305ad8d5711SMunechika SUMIKAWA 	if (ln->ln_state < ND6_LLINFO_REACHABLE)
13066e6b3f7cSQing Li 		goto done;
130782cd038dSYoshinobu Inoue 
1308686cdd19SJun-ichiro itojun Hagino 	/*
1309686cdd19SJun-ichiro itojun Hagino 	 * if we get upper-layer reachability confirmation many times,
1310686cdd19SJun-ichiro itojun Hagino 	 * it is possible we have false information.
1311686cdd19SJun-ichiro itojun Hagino 	 */
1312686cdd19SJun-ichiro itojun Hagino 	if (!force) {
1313686cdd19SJun-ichiro itojun Hagino 		ln->ln_byhint++;
13146e6b3f7cSQing Li 		if (ln->ln_byhint > V_nd6_maxnudhint) {
13156e6b3f7cSQing Li 			goto done;
13166e6b3f7cSQing Li 		}
1317686cdd19SJun-ichiro itojun Hagino 	}
1318686cdd19SJun-ichiro itojun Hagino 
131982cd038dSYoshinobu Inoue  	ln->ln_state = ND6_LLINFO_REACHABLE;
1320743eee66SSUZUKI Shinsuke 	if (!ND6_LLINFO_PERMANENT(ln)) {
1321d715e397SBjoern A. Zeeb 		nd6_llinfo_settimer_locked(ln,
1322743eee66SSUZUKI Shinsuke 		    (long)ND_IFINFO(rt->rt_ifp)->reachable * hz);
1323743eee66SSUZUKI Shinsuke 	}
13246e6b3f7cSQing Li done:
13256e6b3f7cSQing Li 	LLE_WUNLOCK(ln);
132682cd038dSYoshinobu Inoue }
132782cd038dSYoshinobu Inoue 
132882cd038dSYoshinobu Inoue 
13290f1aca65SQing Li /*
13300f1aca65SQing Li  * Rejuvenate this function for routing operations related
13310f1aca65SQing Li  * processing.
13320f1aca65SQing Li  */
13330f1aca65SQing Li void
13340f1aca65SQing Li nd6_rtrequest(int req, struct rtentry *rt, struct rt_addrinfo *info)
13350f1aca65SQing Li {
133639e19560SBjoern A. Zeeb 	struct sockaddr_in6 *gateway;
13370f1aca65SQing Li 	struct nd_defrouter *dr;
133839e19560SBjoern A. Zeeb 	struct ifnet *ifp;
13390f1aca65SQing Li 
134039e19560SBjoern A. Zeeb 	gateway = (struct sockaddr_in6 *)rt->rt_gateway;
134139e19560SBjoern A. Zeeb 	ifp = rt->rt_ifp;
13420f1aca65SQing Li 
13430f1aca65SQing Li 	switch (req) {
13440f1aca65SQing Li 	case RTM_ADD:
13450f1aca65SQing Li 		break;
13460f1aca65SQing Li 
13470f1aca65SQing Li 	case RTM_DELETE:
13480f1aca65SQing Li 		if (!ifp)
13490f1aca65SQing Li 			return;
13500f1aca65SQing Li 		/*
13510f1aca65SQing Li 		 * Only indirect routes are interesting.
13520f1aca65SQing Li 		 */
13530f1aca65SQing Li 		if ((rt->rt_flags & RTF_GATEWAY) == 0)
13540f1aca65SQing Li 			return;
13550f1aca65SQing Li 		/*
13560f1aca65SQing Li 		 * check for default route
13570f1aca65SQing Li 		 */
13580f1aca65SQing Li 		if (IN6_ARE_ADDR_EQUAL(&in6addr_any,
13590f1aca65SQing Li 				       &SIN6(rt_key(rt))->sin6_addr)) {
13600f1aca65SQing Li 
13610f1aca65SQing Li 			dr = defrouter_lookup(&gateway->sin6_addr, ifp);
13620f1aca65SQing Li 			if (dr != NULL)
13630f1aca65SQing Li 				dr->installed = 0;
13640f1aca65SQing Li 		}
13650f1aca65SQing Li 		break;
13660f1aca65SQing Li 	}
13670f1aca65SQing Li }
13680f1aca65SQing Li 
13690f1aca65SQing Li 
137082cd038dSYoshinobu Inoue int
13711272577eSXin LI nd6_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp)
137282cd038dSYoshinobu Inoue {
137382cd038dSYoshinobu Inoue 	struct in6_ndireq *ndi = (struct in6_ndireq *)data;
137482cd038dSYoshinobu Inoue 	struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data;
1375686cdd19SJun-ichiro itojun Hagino 	struct in6_ndifreq *ndif = (struct in6_ndifreq *)data;
1376d0bec2c5SHiroki Sato 	int error = 0;
137782cd038dSYoshinobu Inoue 
13780de0dd9bSHiroki Sato 	if (ifp->if_afdata[AF_INET6] == NULL)
13790de0dd9bSHiroki Sato 		return (EPFNOSUPPORT);
138082cd038dSYoshinobu Inoue 	switch (cmd) {
138133841545SHajimu UMEMOTO 	case OSIOCGIFINFO_IN6:
13822ce62dceSSUZUKI Shinsuke #define ND	ndi->ndi
138331b1bfe1SHajimu UMEMOTO 		/* XXX: old ndp(8) assumes a positive value for linkmtu. */
13842ce62dceSSUZUKI Shinsuke 		bzero(&ND, sizeof(ND));
13852ce62dceSSUZUKI Shinsuke 		ND.linkmtu = IN6_LINKMTU(ifp);
13862ce62dceSSUZUKI Shinsuke 		ND.maxmtu = ND_IFINFO(ifp)->maxmtu;
13872ce62dceSSUZUKI Shinsuke 		ND.basereachable = ND_IFINFO(ifp)->basereachable;
13882ce62dceSSUZUKI Shinsuke 		ND.reachable = ND_IFINFO(ifp)->reachable;
13892ce62dceSSUZUKI Shinsuke 		ND.retrans = ND_IFINFO(ifp)->retrans;
13902ce62dceSSUZUKI Shinsuke 		ND.flags = ND_IFINFO(ifp)->flags;
13912ce62dceSSUZUKI Shinsuke 		ND.recalctm = ND_IFINFO(ifp)->recalctm;
13922ce62dceSSUZUKI Shinsuke 		ND.chlim = ND_IFINFO(ifp)->chlim;
139333841545SHajimu UMEMOTO 		break;
139482cd038dSYoshinobu Inoue 	case SIOCGIFINFO_IN6:
13952ce62dceSSUZUKI Shinsuke 		ND = *ND_IFINFO(ifp);
139682cd038dSYoshinobu Inoue 		break;
1397b9204379SSUZUKI Shinsuke 	case SIOCSIFINFO_IN6:
1398b9204379SSUZUKI Shinsuke 		/*
1399b9204379SSUZUKI Shinsuke 		 * used to change host variables from userland.
1400b9204379SSUZUKI Shinsuke 		 * intented for a use on router to reflect RA configurations.
1401b9204379SSUZUKI Shinsuke 		 */
1402b9204379SSUZUKI Shinsuke 		/* 0 means 'unspecified' */
1403b9204379SSUZUKI Shinsuke 		if (ND.linkmtu != 0) {
1404b9204379SSUZUKI Shinsuke 			if (ND.linkmtu < IPV6_MMTU ||
1405b9204379SSUZUKI Shinsuke 			    ND.linkmtu > IN6_LINKMTU(ifp)) {
1406b9204379SSUZUKI Shinsuke 				error = EINVAL;
1407b9204379SSUZUKI Shinsuke 				break;
1408b9204379SSUZUKI Shinsuke 			}
1409b9204379SSUZUKI Shinsuke 			ND_IFINFO(ifp)->linkmtu = ND.linkmtu;
1410b9204379SSUZUKI Shinsuke 		}
1411b9204379SSUZUKI Shinsuke 
1412b9204379SSUZUKI Shinsuke 		if (ND.basereachable != 0) {
1413b9204379SSUZUKI Shinsuke 			int obasereachable = ND_IFINFO(ifp)->basereachable;
1414b9204379SSUZUKI Shinsuke 
1415b9204379SSUZUKI Shinsuke 			ND_IFINFO(ifp)->basereachable = ND.basereachable;
1416b9204379SSUZUKI Shinsuke 			if (ND.basereachable != obasereachable)
1417b9204379SSUZUKI Shinsuke 				ND_IFINFO(ifp)->reachable =
1418b9204379SSUZUKI Shinsuke 				    ND_COMPUTE_RTIME(ND.basereachable);
1419b9204379SSUZUKI Shinsuke 		}
1420b9204379SSUZUKI Shinsuke 		if (ND.retrans != 0)
1421b9204379SSUZUKI Shinsuke 			ND_IFINFO(ifp)->retrans = ND.retrans;
1422b9204379SSUZUKI Shinsuke 		if (ND.chlim != 0)
1423b9204379SSUZUKI Shinsuke 			ND_IFINFO(ifp)->chlim = ND.chlim;
1424b9204379SSUZUKI Shinsuke 		/* FALLTHROUGH */
1425686cdd19SJun-ichiro itojun Hagino 	case SIOCSIFINFO_FLAGS:
1426a283298cSHiroki Sato 	{
1427a283298cSHiroki Sato 		struct ifaddr *ifa;
1428a283298cSHiroki Sato 		struct in6_ifaddr *ia;
1429a283298cSHiroki Sato 
1430a283298cSHiroki Sato 		if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
1431a283298cSHiroki Sato 		    !(ND.flags & ND6_IFF_IFDISABLED)) {
1432a283298cSHiroki Sato 			/* ifdisabled 1->0 transision */
1433a283298cSHiroki Sato 
1434a283298cSHiroki Sato 			/*
1435a283298cSHiroki Sato 			 * If the interface is marked as ND6_IFF_IFDISABLED and
1436a283298cSHiroki Sato 			 * has an link-local address with IN6_IFF_DUPLICATED,
1437a283298cSHiroki Sato 			 * do not clear ND6_IFF_IFDISABLED.
1438a283298cSHiroki Sato 			 * See RFC 4862, Section 5.4.5.
1439a283298cSHiroki Sato 			 */
1440137f91e8SJohn Baldwin 			IF_ADDR_RLOCK(ifp);
1441a283298cSHiroki Sato 			TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1442a283298cSHiroki Sato 				if (ifa->ifa_addr->sa_family != AF_INET6)
1443a283298cSHiroki Sato 					continue;
1444a283298cSHiroki Sato 				ia = (struct in6_ifaddr *)ifa;
1445a283298cSHiroki Sato 				if ((ia->ia6_flags & IN6_IFF_DUPLICATED) &&
1446d0bec2c5SHiroki Sato 				    IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia)))
1447a283298cSHiroki Sato 					break;
1448a283298cSHiroki Sato 			}
1449137f91e8SJohn Baldwin 			IF_ADDR_RUNLOCK(ifp);
1450a283298cSHiroki Sato 
1451d0bec2c5SHiroki Sato 			if (ifa != NULL) {
1452d0bec2c5SHiroki Sato 				/* LLA is duplicated. */
1453a283298cSHiroki Sato 				ND.flags |= ND6_IFF_IFDISABLED;
1454a283298cSHiroki Sato 				log(LOG_ERR, "Cannot enable an interface"
1455a283298cSHiroki Sato 				    " with a link-local address marked"
1456a283298cSHiroki Sato 				    " duplicate.\n");
1457a283298cSHiroki Sato 			} else {
1458a283298cSHiroki Sato 				ND_IFINFO(ifp)->flags &= ~ND6_IFF_IFDISABLED;
1459154d5f73SHiroki Sato 				if (ifp->if_flags & IFF_UP)
1460a283298cSHiroki Sato 					in6_if_up(ifp);
1461a283298cSHiroki Sato 			}
1462a283298cSHiroki Sato 		} else if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
1463a283298cSHiroki Sato 			    (ND.flags & ND6_IFF_IFDISABLED)) {
1464a283298cSHiroki Sato 			/* ifdisabled 0->1 transision */
1465a283298cSHiroki Sato 			/* Mark all IPv6 address as tentative. */
1466a283298cSHiroki Sato 
1467a283298cSHiroki Sato 			ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
1468d0bec2c5SHiroki Sato 			if ((ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD) == 0) {
1469137f91e8SJohn Baldwin 				IF_ADDR_RLOCK(ifp);
1470d0bec2c5SHiroki Sato 				TAILQ_FOREACH(ifa, &ifp->if_addrhead,
1471d0bec2c5SHiroki Sato 				    ifa_link) {
1472d0bec2c5SHiroki Sato 					if (ifa->ifa_addr->sa_family !=
1473d0bec2c5SHiroki Sato 					    AF_INET6)
1474a283298cSHiroki Sato 						continue;
1475a283298cSHiroki Sato 					ia = (struct in6_ifaddr *)ifa;
1476a283298cSHiroki Sato 					ia->ia6_flags |= IN6_IFF_TENTATIVE;
1477a283298cSHiroki Sato 				}
1478137f91e8SJohn Baldwin 				IF_ADDR_RUNLOCK(ifp);
1479a283298cSHiroki Sato 			}
1480d0bec2c5SHiroki Sato 		}
1481a283298cSHiroki Sato 
1482154d5f73SHiroki Sato 		if (ND.flags & ND6_IFF_AUTO_LINKLOCAL) {
1483154d5f73SHiroki Sato 			if (!(ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL)) {
1484a283298cSHiroki Sato 				/* auto_linklocal 0->1 transision */
1485a283298cSHiroki Sato 
1486a283298cSHiroki Sato 				/* If no link-local address on ifp, configure */
1487a283298cSHiroki Sato 				ND_IFINFO(ifp)->flags |= ND6_IFF_AUTO_LINKLOCAL;
1488a283298cSHiroki Sato 				in6_ifattach(ifp, NULL);
1489154d5f73SHiroki Sato 			} else if (!(ND.flags & ND6_IFF_IFDISABLED) &&
1490154d5f73SHiroki Sato 			    ifp->if_flags & IFF_UP) {
149177bc4985SHiroki Sato 				/*
149277bc4985SHiroki Sato 				 * When the IF already has
1493154d5f73SHiroki Sato 				 * ND6_IFF_AUTO_LINKLOCAL, no link-local
1494154d5f73SHiroki Sato 				 * address is assigned, and IFF_UP, try to
1495154d5f73SHiroki Sato 				 * assign one.
149677bc4985SHiroki Sato 				 */
1497137f91e8SJohn Baldwin 				IF_ADDR_RLOCK(ifp);
1498d0bec2c5SHiroki Sato 				TAILQ_FOREACH(ifa, &ifp->if_addrhead,
1499d0bec2c5SHiroki Sato 				    ifa_link) {
1500d0bec2c5SHiroki Sato 					if (ifa->ifa_addr->sa_family !=
1501d0bec2c5SHiroki Sato 					    AF_INET6)
150277bc4985SHiroki Sato 						continue;
150377bc4985SHiroki Sato 					ia = (struct in6_ifaddr *)ifa;
1504d0bec2c5SHiroki Sato 					if (IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia)))
150577bc4985SHiroki Sato 						break;
150677bc4985SHiroki Sato 				}
1507137f91e8SJohn Baldwin 				IF_ADDR_RUNLOCK(ifp);
1508d0bec2c5SHiroki Sato 				if (ifa != NULL)
1509d0bec2c5SHiroki Sato 					/* No LLA is configured. */
151077bc4985SHiroki Sato 					in6_ifattach(ifp, NULL);
1511a283298cSHiroki Sato 			}
1512a283298cSHiroki Sato 		}
1513154d5f73SHiroki Sato 	}
15142ce62dceSSUZUKI Shinsuke 		ND_IFINFO(ifp)->flags = ND.flags;
1515686cdd19SJun-ichiro itojun Hagino 		break;
15162ce62dceSSUZUKI Shinsuke #undef ND
1517686cdd19SJun-ichiro itojun Hagino 	case SIOCSNDFLUSH_IN6:	/* XXX: the ioctl name is confusing... */
1518743eee66SSUZUKI Shinsuke 		/* sync kernel routing table with the default router list */
1519743eee66SSUZUKI Shinsuke 		defrouter_reset();
1520686cdd19SJun-ichiro itojun Hagino 		defrouter_select();
152182cd038dSYoshinobu Inoue 		break;
152282cd038dSYoshinobu Inoue 	case SIOCSPFXFLUSH_IN6:
152382cd038dSYoshinobu Inoue 	{
152482cd038dSYoshinobu Inoue 		/* flush all the prefix advertised by routers */
152582cd038dSYoshinobu Inoue 		struct nd_prefix *pr, *next;
152682cd038dSYoshinobu Inoue 
15273b0b2840SJohn Baldwin 		LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, next) {
152833841545SHajimu UMEMOTO 			struct in6_ifaddr *ia, *ia_next;
152933841545SHajimu UMEMOTO 
153033841545SHajimu UMEMOTO 			if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
153133841545SHajimu UMEMOTO 				continue; /* XXX */
153233841545SHajimu UMEMOTO 
153333841545SHajimu UMEMOTO 			/* do we really have to remove addresses as well? */
1534d1da0a06SRobert Watson 			/* XXXRW: in6_ifaddrhead locking. */
153580af0152SRobert Watson 			TAILQ_FOREACH_SAFE(ia, &V_in6_ifaddrhead, ia_link,
153680af0152SRobert Watson 			    ia_next) {
153733841545SHajimu UMEMOTO 				if ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0)
153833841545SHajimu UMEMOTO 					continue;
153933841545SHajimu UMEMOTO 
154033841545SHajimu UMEMOTO 				if (ia->ia6_ndpr == pr)
154133841545SHajimu UMEMOTO 					in6_purgeaddr(&ia->ia_ifa);
154233841545SHajimu UMEMOTO 			}
154382cd038dSYoshinobu Inoue 			prelist_remove(pr);
154482cd038dSYoshinobu Inoue 		}
154582cd038dSYoshinobu Inoue 		break;
154682cd038dSYoshinobu Inoue 	}
154782cd038dSYoshinobu Inoue 	case SIOCSRTRFLUSH_IN6:
154882cd038dSYoshinobu Inoue 	{
154982cd038dSYoshinobu Inoue 		/* flush all the default routers */
155082cd038dSYoshinobu Inoue 		struct nd_defrouter *dr, *next;
155182cd038dSYoshinobu Inoue 
1552743eee66SSUZUKI Shinsuke 		defrouter_reset();
15533b0b2840SJohn Baldwin 		TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, next) {
155482cd038dSYoshinobu Inoue 			defrtrlist_del(dr);
155582cd038dSYoshinobu Inoue 		}
1556743eee66SSUZUKI Shinsuke 		defrouter_select();
155782cd038dSYoshinobu Inoue 		break;
155882cd038dSYoshinobu Inoue 	}
155982cd038dSYoshinobu Inoue 	case SIOCGNBRINFO_IN6:
156082cd038dSYoshinobu Inoue 	{
15616e6b3f7cSQing Li 		struct llentry *ln;
156282cd038dSYoshinobu Inoue 		struct in6_addr nb_addr = nbi->addr; /* make local for safety */
156382cd038dSYoshinobu Inoue 
1564a1f7e5f8SHajimu UMEMOTO 		if ((error = in6_setscope(&nb_addr, ifp, NULL)) != 0)
1565a1f7e5f8SHajimu UMEMOTO 			return (error);
156682cd038dSYoshinobu Inoue 
156773cb2f38SAndrey V. Elsukov 		IF_AFDATA_RLOCK(ifp);
15686e6b3f7cSQing Li 		ln = nd6_lookup(&nb_addr, 0, ifp);
156973cb2f38SAndrey V. Elsukov 		IF_AFDATA_RUNLOCK(ifp);
15706e6b3f7cSQing Li 
15716e6b3f7cSQing Li 		if (ln == NULL) {
157282cd038dSYoshinobu Inoue 			error = EINVAL;
157382cd038dSYoshinobu Inoue 			break;
157482cd038dSYoshinobu Inoue 		}
157582cd038dSYoshinobu Inoue 		nbi->state = ln->ln_state;
15766e6b3f7cSQing Li 		nbi->asked = ln->la_asked;
157782cd038dSYoshinobu Inoue 		nbi->isrouter = ln->ln_router;
15785a041915SHiroki Sato 		if (ln->la_expire == 0)
15795a041915SHiroki Sato 			nbi->expire = 0;
15805a041915SHiroki Sato 		else
15815a041915SHiroki Sato 			nbi->expire = ln->la_expire +
15825a041915SHiroki Sato 			    (time_second - time_uptime);
15836e6b3f7cSQing Li 		LLE_RUNLOCK(ln);
158482cd038dSYoshinobu Inoue 		break;
158582cd038dSYoshinobu Inoue 	}
1586686cdd19SJun-ichiro itojun Hagino 	case SIOCGDEFIFACE_IN6:	/* XXX: should be implemented as a sysctl? */
1587603724d3SBjoern A. Zeeb 		ndif->ifindex = V_nd6_defifindex;
1588686cdd19SJun-ichiro itojun Hagino 		break;
1589686cdd19SJun-ichiro itojun Hagino 	case SIOCSDEFIFACE_IN6:	/* XXX: should be implemented as a sysctl? */
1590686cdd19SJun-ichiro itojun Hagino 		return (nd6_setdefaultiface(ndif->ifindex));
159182cd038dSYoshinobu Inoue 	}
159282cd038dSYoshinobu Inoue 	return (error);
159382cd038dSYoshinobu Inoue }
159482cd038dSYoshinobu Inoue 
159582cd038dSYoshinobu Inoue /*
15960e2dcee6SAlexander V. Chernikov  * Calculates new isRouter value based on provided parameters and
15970e2dcee6SAlexander V. Chernikov  * returns it.
15980e2dcee6SAlexander V. Chernikov  */
15990e2dcee6SAlexander V. Chernikov static int
16000e2dcee6SAlexander V. Chernikov nd6_is_router(int type, int code, int is_new, int old_addr, int new_addr,
16010e2dcee6SAlexander V. Chernikov     int ln_router)
16020e2dcee6SAlexander V. Chernikov {
16030e2dcee6SAlexander V. Chernikov 
16040e2dcee6SAlexander V. Chernikov 	/*
16050e2dcee6SAlexander V. Chernikov 	 * ICMP6 type dependent behavior.
16060e2dcee6SAlexander V. Chernikov 	 *
16070e2dcee6SAlexander V. Chernikov 	 * NS: clear IsRouter if new entry
16080e2dcee6SAlexander V. Chernikov 	 * RS: clear IsRouter
16090e2dcee6SAlexander V. Chernikov 	 * RA: set IsRouter if there's lladdr
16100e2dcee6SAlexander V. Chernikov 	 * redir: clear IsRouter if new entry
16110e2dcee6SAlexander V. Chernikov 	 *
16120e2dcee6SAlexander V. Chernikov 	 * RA case, (1):
16130e2dcee6SAlexander V. Chernikov 	 * The spec says that we must set IsRouter in the following cases:
16140e2dcee6SAlexander V. Chernikov 	 * - If lladdr exist, set IsRouter.  This means (1-5).
16150e2dcee6SAlexander V. Chernikov 	 * - If it is old entry (!newentry), set IsRouter.  This means (7).
16160e2dcee6SAlexander V. Chernikov 	 * So, based on the spec, in (1-5) and (7) cases we must set IsRouter.
16170e2dcee6SAlexander V. Chernikov 	 * A quetion arises for (1) case.  (1) case has no lladdr in the
16180e2dcee6SAlexander V. Chernikov 	 * neighbor cache, this is similar to (6).
16190e2dcee6SAlexander V. Chernikov 	 * This case is rare but we figured that we MUST NOT set IsRouter.
16200e2dcee6SAlexander V. Chernikov 	 *
162141a31e78SAlexander V. Chernikov 	 *   is_new  old_addr new_addr 	    NS  RS  RA	redir
16220e2dcee6SAlexander V. Chernikov 	 *							D R
162341a31e78SAlexander V. Chernikov 	 *	0	n	n	(1)	c   ?     s
162441a31e78SAlexander V. Chernikov 	 *	0	y	n	(2)	c   s     s
162541a31e78SAlexander V. Chernikov 	 *	0	n	y	(3)	c   s     s
162641a31e78SAlexander V. Chernikov 	 *	0	y	y	(4)	c   s     s
162741a31e78SAlexander V. Chernikov 	 *	0	y	y	(5)	c   s     s
162841a31e78SAlexander V. Chernikov 	 *	1	--	n	(6) c	c	c s
162941a31e78SAlexander V. Chernikov 	 *	1	--	y	(7) c	c   s	c s
16300e2dcee6SAlexander V. Chernikov 	 *
16310e2dcee6SAlexander V. Chernikov 	 *					(c=clear s=set)
16320e2dcee6SAlexander V. Chernikov 	 */
16330e2dcee6SAlexander V. Chernikov 	switch (type & 0xff) {
16340e2dcee6SAlexander V. Chernikov 	case ND_NEIGHBOR_SOLICIT:
16350e2dcee6SAlexander V. Chernikov 		/*
16360e2dcee6SAlexander V. Chernikov 		 * New entry must have is_router flag cleared.
16370e2dcee6SAlexander V. Chernikov 		 */
16380e2dcee6SAlexander V. Chernikov 		if (is_new)					/* (6-7) */
16390e2dcee6SAlexander V. Chernikov 			ln_router = 0;
16400e2dcee6SAlexander V. Chernikov 		break;
16410e2dcee6SAlexander V. Chernikov 	case ND_REDIRECT:
16420e2dcee6SAlexander V. Chernikov 		/*
16430e2dcee6SAlexander V. Chernikov 		 * If the icmp is a redirect to a better router, always set the
16440e2dcee6SAlexander V. Chernikov 		 * is_router flag.  Otherwise, if the entry is newly created,
16450e2dcee6SAlexander V. Chernikov 		 * clear the flag.  [RFC 2461, sec 8.3]
16460e2dcee6SAlexander V. Chernikov 		 */
16470e2dcee6SAlexander V. Chernikov 		if (code == ND_REDIRECT_ROUTER)
16480e2dcee6SAlexander V. Chernikov 			ln_router = 1;
16490e2dcee6SAlexander V. Chernikov 		else {
16500e2dcee6SAlexander V. Chernikov 			if (is_new)				/* (6-7) */
16510e2dcee6SAlexander V. Chernikov 				ln_router = 0;
16520e2dcee6SAlexander V. Chernikov 		}
16530e2dcee6SAlexander V. Chernikov 		break;
16540e2dcee6SAlexander V. Chernikov 	case ND_ROUTER_SOLICIT:
16550e2dcee6SAlexander V. Chernikov 		/*
16560e2dcee6SAlexander V. Chernikov 		 * is_router flag must always be cleared.
16570e2dcee6SAlexander V. Chernikov 		 */
16580e2dcee6SAlexander V. Chernikov 		ln_router = 0;
16590e2dcee6SAlexander V. Chernikov 		break;
16600e2dcee6SAlexander V. Chernikov 	case ND_ROUTER_ADVERT:
16610e2dcee6SAlexander V. Chernikov 		/*
16620e2dcee6SAlexander V. Chernikov 		 * Mark an entry with lladdr as a router.
16630e2dcee6SAlexander V. Chernikov 		 */
16640e2dcee6SAlexander V. Chernikov 		if ((!is_new && (old_addr || new_addr)) ||	/* (2-5) */
16650e2dcee6SAlexander V. Chernikov 		    (is_new && new_addr)) {			/* (7) */
16660e2dcee6SAlexander V. Chernikov 			ln_router = 1;
16670e2dcee6SAlexander V. Chernikov 		}
16680e2dcee6SAlexander V. Chernikov 		break;
16690e2dcee6SAlexander V. Chernikov 	}
16700e2dcee6SAlexander V. Chernikov 
16710e2dcee6SAlexander V. Chernikov 	return (ln_router);
16720e2dcee6SAlexander V. Chernikov }
16730e2dcee6SAlexander V. Chernikov 
16740e2dcee6SAlexander V. Chernikov /*
167582cd038dSYoshinobu Inoue  * Create neighbor cache entry and cache link-layer address,
167682cd038dSYoshinobu Inoue  * on reception of inbound ND6 packets.  (RS/RA/NS/redirect)
16771272577eSXin LI  *
16781272577eSXin LI  * type - ICMP6 type
16791272577eSXin LI  * code - type dependent information
16806e6b3f7cSQing Li  *
168182cd038dSYoshinobu Inoue  */
16820e2dcee6SAlexander V. Chernikov void
16831272577eSXin LI nd6_cache_lladdr(struct ifnet *ifp, struct in6_addr *from, char *lladdr,
16841272577eSXin LI     int lladdrlen, int type, int code)
168582cd038dSYoshinobu Inoue {
16865a255516SAlexander V. Chernikov 	struct llentry *ln = NULL, *ln_tmp;
168782cd038dSYoshinobu Inoue 	int is_newentry;
168882cd038dSYoshinobu Inoue 	int do_update;
168982cd038dSYoshinobu Inoue 	int olladdr;
169082cd038dSYoshinobu Inoue 	int llchange;
169168352503SBjoern A. Zeeb 	int flags;
16923d3728e9SQing Li 	uint16_t router = 0;
16936e6b3f7cSQing Li 	struct sockaddr_in6 sin6;
1694fd14c50bSKip Macy 	struct mbuf *chain = NULL;
16956e6b3f7cSQing Li 
16966e6b3f7cSQing Li 	IF_AFDATA_UNLOCK_ASSERT(ifp);
169782cd038dSYoshinobu Inoue 
169839e19560SBjoern A. Zeeb 	KASSERT(ifp != NULL, ("%s: ifp == NULL", __func__));
169939e19560SBjoern A. Zeeb 	KASSERT(from != NULL, ("%s: from == NULL", __func__));
170082cd038dSYoshinobu Inoue 
170182cd038dSYoshinobu Inoue 	/* nothing must be updated for unspecified address */
170282cd038dSYoshinobu Inoue 	if (IN6_IS_ADDR_UNSPECIFIED(from))
17030e2dcee6SAlexander V. Chernikov 		return;
170482cd038dSYoshinobu Inoue 
170582cd038dSYoshinobu Inoue 	/*
170682cd038dSYoshinobu Inoue 	 * Validation about ifp->if_addrlen and lladdrlen must be done in
170782cd038dSYoshinobu Inoue 	 * the caller.
170882cd038dSYoshinobu Inoue 	 *
170982cd038dSYoshinobu Inoue 	 * XXX If the link does not have link-layer adderss, what should
171082cd038dSYoshinobu Inoue 	 * we do? (ifp->if_addrlen == 0)
171182cd038dSYoshinobu Inoue 	 * Spec says nothing in sections for RA, RS and NA.  There's small
171282cd038dSYoshinobu Inoue 	 * description on it in NS section (RFC 2461 7.2.3).
171382cd038dSYoshinobu Inoue 	 */
171468352503SBjoern A. Zeeb 	flags = lladdr ? ND6_EXCLUSIVE : 0;
1715ea0c3776SAndrey V. Elsukov 	IF_AFDATA_RLOCK(ifp);
17166e6b3f7cSQing Li 	ln = nd6_lookup(from, flags, ifp);
1717ea0c3776SAndrey V. Elsukov 	IF_AFDATA_RUNLOCK(ifp);
17185a255516SAlexander V. Chernikov 	is_newentry = 0;
17196e6b3f7cSQing Li 	if (ln == NULL) {
172068352503SBjoern A. Zeeb 		flags |= ND6_EXCLUSIVE;
17215a255516SAlexander V. Chernikov 		ln = nd6_alloc(from, 0, ifp);
17225a255516SAlexander V. Chernikov 		if (ln == NULL)
17230e2dcee6SAlexander V. Chernikov 			return;
1724*501adf01SAlexander V. Chernikov 
1725*501adf01SAlexander V. Chernikov 		/*
1726*501adf01SAlexander V. Chernikov 		 * Since we already know all the data for the new entry,
1727*501adf01SAlexander V. Chernikov 		 * fill it before insertion.
1728*501adf01SAlexander V. Chernikov 		 */
1729*501adf01SAlexander V. Chernikov 		if (lladdr != NULL) {
1730*501adf01SAlexander V. Chernikov 			bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen);
1731*501adf01SAlexander V. Chernikov 			ln->la_flags |= LLE_VALID;
1732*501adf01SAlexander V. Chernikov 			ln->ln_state = ND6_LLINFO_STALE;
1733*501adf01SAlexander V. Chernikov 		}
17345a255516SAlexander V. Chernikov 		IF_AFDATA_WLOCK(ifp);
17355a255516SAlexander V. Chernikov 		LLE_WLOCK(ln);
17365a255516SAlexander V. Chernikov 		/* Prefer any existing lle over newly-created one */
17375a255516SAlexander V. Chernikov 		ln_tmp = nd6_lookup(from, ND6_EXCLUSIVE, ifp);
17385a255516SAlexander V. Chernikov 		if (ln_tmp == NULL)
17395a255516SAlexander V. Chernikov 			lltable_link_entry(LLTABLE6(ifp), ln);
17405a255516SAlexander V. Chernikov 		IF_AFDATA_WUNLOCK(ifp);
17415a255516SAlexander V. Chernikov 		if (ln_tmp == NULL)
17425a255516SAlexander V. Chernikov 			/* No existing lle, mark as new entry */
174382cd038dSYoshinobu Inoue 			is_newentry = 1;
17445a255516SAlexander V. Chernikov 		else {
17455a255516SAlexander V. Chernikov 			lltable_free_entry(LLTABLE6(ifp), ln);
17465a255516SAlexander V. Chernikov 			ln = ln_tmp;
17475a255516SAlexander V. Chernikov 			ln_tmp = NULL;
17485a255516SAlexander V. Chernikov 		}
17495a255516SAlexander V. Chernikov 	}
175033841545SHajimu UMEMOTO 	/* do nothing if static ndp is set */
17515a255516SAlexander V. Chernikov 	if ((ln->la_flags & LLE_STATIC)) {
17520e2dcee6SAlexander V. Chernikov 		if (flags & ND6_EXCLUSIVE)
17530e2dcee6SAlexander V. Chernikov 			LLE_WUNLOCK(ln);
17540e2dcee6SAlexander V. Chernikov 		else
17550e2dcee6SAlexander V. Chernikov 			LLE_RUNLOCK(ln);
17560e2dcee6SAlexander V. Chernikov 		return;
17573d3728e9SQing Li 	}
175882cd038dSYoshinobu Inoue 
17596e6b3f7cSQing Li 	olladdr = (ln->la_flags & LLE_VALID) ? 1 : 0;
176082cd038dSYoshinobu Inoue 	if (olladdr && lladdr) {
17616e6b3f7cSQing Li 		llchange = bcmp(lladdr, &ln->ll_addr,
17626e6b3f7cSQing Li 		    ifp->if_addrlen);
176341a31e78SAlexander V. Chernikov 	} else if (!olladdr && lladdr)
176441a31e78SAlexander V. Chernikov 		llchange = 1;
176541a31e78SAlexander V. Chernikov 	else
176682cd038dSYoshinobu Inoue 		llchange = 0;
176782cd038dSYoshinobu Inoue 
176882cd038dSYoshinobu Inoue 	/*
176982cd038dSYoshinobu Inoue 	 * newentry olladdr  lladdr  llchange	(*=record)
177082cd038dSYoshinobu Inoue 	 *	0	n	n	--	(1)
177182cd038dSYoshinobu Inoue 	 *	0	y	n	--	(2)
177241a31e78SAlexander V. Chernikov 	 *	0	n	y	y	(3) * STALE
177382cd038dSYoshinobu Inoue 	 *	0	y	y	n	(4) *
177482cd038dSYoshinobu Inoue 	 *	0	y	y	y	(5) * STALE
177582cd038dSYoshinobu Inoue 	 *	1	--	n	--	(6)   NOSTATE(= PASSIVE)
177682cd038dSYoshinobu Inoue 	 *	1	--	y	--	(7) * STALE
177782cd038dSYoshinobu Inoue 	 */
177882cd038dSYoshinobu Inoue 
1779*501adf01SAlexander V. Chernikov 	do_update = 0;
1780*501adf01SAlexander V. Chernikov 	if (!is_newentry && llchange != 0)
1781*501adf01SAlexander V. Chernikov 		do_update = 1;	/* (3,5) */
1782*501adf01SAlexander V. Chernikov 
178382cd038dSYoshinobu Inoue 	if (lladdr) {		/* (3-5) and (7) */
178482cd038dSYoshinobu Inoue 		/*
178582cd038dSYoshinobu Inoue 		 * Record source link-layer address
178682cd038dSYoshinobu Inoue 		 * XXX is it dependent to ifp->if_type?
178782cd038dSYoshinobu Inoue 		 */
17886e6b3f7cSQing Li 		bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen);
17896e6b3f7cSQing Li 		ln->la_flags |= LLE_VALID;
1790*501adf01SAlexander V. Chernikov 		ln->ln_state = ND6_LLINFO_STALE;
179182cd038dSYoshinobu Inoue 
1792*501adf01SAlexander V. Chernikov 		EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
179382cd038dSYoshinobu Inoue 
179482cd038dSYoshinobu Inoue 		if (do_update) {
1795d7968c29SAlexander V. Chernikov 			if (ln->la_hold != NULL)
1796d7968c29SAlexander V. Chernikov 				nd6_grab_holdchain(ln, &chain, &sin6);
179782cd038dSYoshinobu Inoue 		}
179882cd038dSYoshinobu Inoue 	}
179982cd038dSYoshinobu Inoue 
18000e2dcee6SAlexander V. Chernikov 	/* Calculates new router status */
18010e2dcee6SAlexander V. Chernikov 	router = nd6_is_router(type, code, is_newentry, olladdr,
18020e2dcee6SAlexander V. Chernikov 	    lladdr != NULL ? 1 : 0, ln->ln_router);
180382cd038dSYoshinobu Inoue 
18040e2dcee6SAlexander V. Chernikov 	ln->ln_router = router;
18050e2dcee6SAlexander V. Chernikov 	/* Mark non-router redirects with special flag */
18060e2dcee6SAlexander V. Chernikov 	if ((type & 0xFF) == ND_REDIRECT && code != ND_REDIRECT_ROUTER)
18070e2dcee6SAlexander V. Chernikov 		ln->la_flags |= LLE_REDIRECT;
1808c2b3a02bSKip Macy 
18096e6b3f7cSQing Li 	if (flags & ND6_EXCLUSIVE)
18106e6b3f7cSQing Li 		LLE_WUNLOCK(ln);
18116e6b3f7cSQing Li 	else
18126e6b3f7cSQing Li 		LLE_RUNLOCK(ln);
18130e2dcee6SAlexander V. Chernikov 
1814d7968c29SAlexander V. Chernikov 	if (chain != NULL)
1815d7968c29SAlexander V. Chernikov 		nd6_flush_holdchain(ifp, ifp, chain, &sin6);
18166e6b3f7cSQing Li 
1817554bf4aaSHajimu UMEMOTO 	/*
1818554bf4aaSHajimu UMEMOTO 	 * When the link-layer address of a router changes, select the
1819554bf4aaSHajimu UMEMOTO 	 * best router again.  In particular, when the neighbor entry is newly
1820554bf4aaSHajimu UMEMOTO 	 * created, it might affect the selection policy.
1821554bf4aaSHajimu UMEMOTO 	 * Question: can we restrict the first condition to the "is_newentry"
1822554bf4aaSHajimu UMEMOTO 	 * case?
1823554bf4aaSHajimu UMEMOTO 	 * XXX: when we hear an RA from a new router with the link-layer
1824554bf4aaSHajimu UMEMOTO 	 * address option, defrouter_select() is called twice, since
1825554bf4aaSHajimu UMEMOTO 	 * defrtrlist_update called the function as well.  However, I believe
1826554bf4aaSHajimu UMEMOTO 	 * we can compromise the overhead, since it only happens the first
1827554bf4aaSHajimu UMEMOTO 	 * time.
1828554bf4aaSHajimu UMEMOTO 	 * XXX: although defrouter_select() should not have a bad effect
1829554bf4aaSHajimu UMEMOTO 	 * for those are not autoconfigured hosts, we explicitly avoid such
1830554bf4aaSHajimu UMEMOTO 	 * cases for safety.
1831554bf4aaSHajimu UMEMOTO 	 */
1832*501adf01SAlexander V. Chernikov 	if ((do_update || is_newentry) && router &&
1833a283298cSHiroki Sato 	    ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
18346e6b3f7cSQing Li 		/*
18356e6b3f7cSQing Li 		 * guaranteed recursion
18366e6b3f7cSQing Li 		 */
1837554bf4aaSHajimu UMEMOTO 		defrouter_select();
18386e6b3f7cSQing Li 	}
183982cd038dSYoshinobu Inoue }
184082cd038dSYoshinobu Inoue 
184182cd038dSYoshinobu Inoue static void
18428b615593SMarko Zec nd6_slowtimo(void *arg)
184382cd038dSYoshinobu Inoue {
18448b615593SMarko Zec 	CURVNET_SET((struct vnet *) arg);
184533841545SHajimu UMEMOTO 	struct nd_ifinfo *nd6if;
184631b1bfe1SHajimu UMEMOTO 	struct ifnet *ifp;
184782cd038dSYoshinobu Inoue 
1848603724d3SBjoern A. Zeeb 	callout_reset(&V_nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,
1849f6dfe47aSMarko Zec 	    nd6_slowtimo, curvnet);
185077dfcdc4SRobert Watson 	IFNET_RLOCK_NOSLEEP();
1851e6abaf91SGleb Smirnoff 	TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
18520de0dd9bSHiroki Sato 		if (ifp->if_afdata[AF_INET6] == NULL)
18530de0dd9bSHiroki Sato 			continue;
185431b1bfe1SHajimu UMEMOTO 		nd6if = ND_IFINFO(ifp);
185582cd038dSYoshinobu Inoue 		if (nd6if->basereachable && /* already initialized */
185682cd038dSYoshinobu Inoue 		    (nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) {
185782cd038dSYoshinobu Inoue 			/*
185882cd038dSYoshinobu Inoue 			 * Since reachable time rarely changes by router
185982cd038dSYoshinobu Inoue 			 * advertisements, we SHOULD insure that a new random
186082cd038dSYoshinobu Inoue 			 * value gets recomputed at least once every few hours.
186182cd038dSYoshinobu Inoue 			 * (RFC 2461, 6.3.4)
186282cd038dSYoshinobu Inoue 			 */
1863603724d3SBjoern A. Zeeb 			nd6if->recalctm = V_nd6_recalc_reachtm_interval;
186482cd038dSYoshinobu Inoue 			nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable);
186582cd038dSYoshinobu Inoue 		}
186682cd038dSYoshinobu Inoue 	}
186777dfcdc4SRobert Watson 	IFNET_RUNLOCK_NOSLEEP();
18688b615593SMarko Zec 	CURVNET_RESTORE();
186982cd038dSYoshinobu Inoue }
187082cd038dSYoshinobu Inoue 
1871d7968c29SAlexander V. Chernikov void
1872d7968c29SAlexander V. Chernikov nd6_grab_holdchain(struct llentry *ln, struct mbuf **chain,
1873d7968c29SAlexander V. Chernikov     struct sockaddr_in6 *sin6)
1874d7968c29SAlexander V. Chernikov {
1875d7968c29SAlexander V. Chernikov 
1876d7968c29SAlexander V. Chernikov 	LLE_WLOCK_ASSERT(ln);
1877d7968c29SAlexander V. Chernikov 
1878d7968c29SAlexander V. Chernikov 	*chain = ln->la_hold;
1879d7968c29SAlexander V. Chernikov 	ln->la_hold = NULL;
1880314294deSAlexander V. Chernikov 	lltable_fill_sa_entry(ln, (struct sockaddr *)sin6);
1881d7968c29SAlexander V. Chernikov 
1882d7968c29SAlexander V. Chernikov 	if (ln->ln_state == ND6_LLINFO_STALE) {
1883d7968c29SAlexander V. Chernikov 
1884d7968c29SAlexander V. Chernikov 		/*
1885d7968c29SAlexander V. Chernikov 		 * The first time we send a packet to a
1886d7968c29SAlexander V. Chernikov 		 * neighbor whose entry is STALE, we have
1887d7968c29SAlexander V. Chernikov 		 * to change the state to DELAY and a sets
1888d7968c29SAlexander V. Chernikov 		 * a timer to expire in DELAY_FIRST_PROBE_TIME
1889d7968c29SAlexander V. Chernikov 		 * seconds to ensure do neighbor unreachability
1890d7968c29SAlexander V. Chernikov 		 * detection on expiration.
1891d7968c29SAlexander V. Chernikov 		 * (RFC 2461 7.3.3)
1892d7968c29SAlexander V. Chernikov 		 */
1893d7968c29SAlexander V. Chernikov 		ln->la_asked = 0;
1894d7968c29SAlexander V. Chernikov 		ln->ln_state = ND6_LLINFO_DELAY;
1895d7968c29SAlexander V. Chernikov 		nd6_llinfo_settimer_locked(ln, (long)V_nd6_delay * hz);
1896d7968c29SAlexander V. Chernikov 	}
1897d7968c29SAlexander V. Chernikov }
1898d7968c29SAlexander V. Chernikov 
18991fe201c3SAlexander V. Chernikov int
1900d7968c29SAlexander V. Chernikov nd6_output_ifp(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m,
1901d7968c29SAlexander V. Chernikov     struct sockaddr_in6 *dst)
1902d7968c29SAlexander V. Chernikov {
1903d7968c29SAlexander V. Chernikov 	int error;
1904d7968c29SAlexander V. Chernikov 	int ip6len;
1905d7968c29SAlexander V. Chernikov 	struct ip6_hdr *ip6;
1906d7968c29SAlexander V. Chernikov 	struct m_tag *mtag;
1907d7968c29SAlexander V. Chernikov 
1908d7968c29SAlexander V. Chernikov #ifdef MAC
1909d7968c29SAlexander V. Chernikov 	mac_netinet6_nd6_send(ifp, m);
1910d7968c29SAlexander V. Chernikov #endif
1911d7968c29SAlexander V. Chernikov 
1912d7968c29SAlexander V. Chernikov 	/*
1913d7968c29SAlexander V. Chernikov 	 * If called from nd6_ns_output() (NS), nd6_na_output() (NA),
1914d7968c29SAlexander V. Chernikov 	 * icmp6_redirect_output() (REDIRECT) or from rip6_output() (RS, RA
1915d7968c29SAlexander V. Chernikov 	 * as handled by rtsol and rtadvd), mbufs will be tagged for SeND
1916d7968c29SAlexander V. Chernikov 	 * to be diverted to user space.  When re-injected into the kernel,
1917d7968c29SAlexander V. Chernikov 	 * send_output() will directly dispatch them to the outgoing interface.
1918d7968c29SAlexander V. Chernikov 	 */
1919d7968c29SAlexander V. Chernikov 	if (send_sendso_input_hook != NULL) {
1920d7968c29SAlexander V. Chernikov 		mtag = m_tag_find(m, PACKET_TAG_ND_OUTGOING, NULL);
1921d7968c29SAlexander V. Chernikov 		if (mtag != NULL) {
1922d7968c29SAlexander V. Chernikov 			ip6 = mtod(m, struct ip6_hdr *);
1923d7968c29SAlexander V. Chernikov 			ip6len = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen);
1924d7968c29SAlexander V. Chernikov 			/* Use the SEND socket */
1925d7968c29SAlexander V. Chernikov 			error = send_sendso_input_hook(m, ifp, SND_OUT,
1926d7968c29SAlexander V. Chernikov 			    ip6len);
1927d7968c29SAlexander V. Chernikov 			/* -1 == no app on SEND socket */
1928d7968c29SAlexander V. Chernikov 			if (error == 0 || error != -1)
1929d7968c29SAlexander V. Chernikov 			    return (error);
1930d7968c29SAlexander V. Chernikov 		}
1931d7968c29SAlexander V. Chernikov 	}
1932d7968c29SAlexander V. Chernikov 
1933d7968c29SAlexander V. Chernikov 	m_clrprotoflags(m);	/* Avoid confusing lower layers. */
1934d7968c29SAlexander V. Chernikov 	IP_PROBE(send, NULL, NULL, mtod(m, struct ip6_hdr *), ifp, NULL,
1935d7968c29SAlexander V. Chernikov 	    mtod(m, struct ip6_hdr *));
1936d7968c29SAlexander V. Chernikov 
1937d7968c29SAlexander V. Chernikov 	if ((ifp->if_flags & IFF_LOOPBACK) == 0)
1938d7968c29SAlexander V. Chernikov 		origifp = ifp;
1939d7968c29SAlexander V. Chernikov 
1940d7968c29SAlexander V. Chernikov 	error = (*ifp->if_output)(origifp, m, (struct sockaddr *)dst, NULL);
1941d7968c29SAlexander V. Chernikov 	return (error);
1942d7968c29SAlexander V. Chernikov }
1943d7968c29SAlexander V. Chernikov 
1944f6990c4eSAlexander V. Chernikov /*
19451fe201c3SAlexander V. Chernikov  * Do L2 address resolution for @sa_dst address. Stores found
19461fe201c3SAlexander V. Chernikov  * address in @desten buffer. Copy of lle ln_flags can be also
19471fe201c3SAlexander V. Chernikov  * saved in @pflags if @pflags is non-NULL.
19481fe201c3SAlexander V. Chernikov  *
19491fe201c3SAlexander V. Chernikov  * If destination LLE does not exists or lle state modification
19501fe201c3SAlexander V. Chernikov  * is required, call "slow" version.
19511fe201c3SAlexander V. Chernikov  *
19521fe201c3SAlexander V. Chernikov  * Return values:
19531fe201c3SAlexander V. Chernikov  * - 0 on success (address copied to buffer).
19541fe201c3SAlexander V. Chernikov  * - EWOULDBLOCK (no local error, but address is still unresolved)
19551fe201c3SAlexander V. Chernikov  * - other errors (alloc failure, etc)
1956f6990c4eSAlexander V. Chernikov  */
195782cd038dSYoshinobu Inoue int
19581fe201c3SAlexander V. Chernikov nd6_resolve(struct ifnet *ifp, int is_gw, struct mbuf *m,
19591fe201c3SAlexander V. Chernikov     const struct sockaddr *sa_dst, u_char *desten, uint32_t *pflags)
196082cd038dSYoshinobu Inoue {
1961f6990c4eSAlexander V. Chernikov 	struct llentry *ln = NULL;
19621fe201c3SAlexander V. Chernikov 	const struct sockaddr_in6 *dst6;
19631fe201c3SAlexander V. Chernikov 
19641fe201c3SAlexander V. Chernikov 	if (pflags != NULL)
19651fe201c3SAlexander V. Chernikov 		*pflags = 0;
19661fe201c3SAlexander V. Chernikov 
19671fe201c3SAlexander V. Chernikov 	dst6 = (const struct sockaddr_in6 *)sa_dst;
19686e6b3f7cSQing Li 
1969f6990c4eSAlexander V. Chernikov 	/* discard the packet if IPv6 operation is disabled on the interface */
1970f6990c4eSAlexander V. Chernikov 	if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)) {
1971f6990c4eSAlexander V. Chernikov 		m_freem(m);
1972f6990c4eSAlexander V. Chernikov 		return (ENETDOWN); /* better error? */
1973f6990c4eSAlexander V. Chernikov 	}
1974f6990c4eSAlexander V. Chernikov 
19751fe201c3SAlexander V. Chernikov 	if (m != NULL && m->m_flags & M_MCAST) {
19761fe201c3SAlexander V. Chernikov 		switch (ifp->if_type) {
19771fe201c3SAlexander V. Chernikov 		case IFT_ETHER:
19781fe201c3SAlexander V. Chernikov 		case IFT_FDDI:
19791fe201c3SAlexander V. Chernikov 		case IFT_L2VLAN:
19801fe201c3SAlexander V. Chernikov 		case IFT_IEEE80211:
19811fe201c3SAlexander V. Chernikov 		case IFT_BRIDGE:
19821fe201c3SAlexander V. Chernikov 		case IFT_ISO88025:
19831fe201c3SAlexander V. Chernikov 			ETHER_MAP_IPV6_MULTICAST(&dst6->sin6_addr,
19841fe201c3SAlexander V. Chernikov 						 desten);
19851fe201c3SAlexander V. Chernikov 			return (0);
19861fe201c3SAlexander V. Chernikov 		default:
19871fe201c3SAlexander V. Chernikov 			m_freem(m);
19881fe201c3SAlexander V. Chernikov 			return (EAFNOSUPPORT);
19891fe201c3SAlexander V. Chernikov 		}
19901fe201c3SAlexander V. Chernikov 	}
1991f6990c4eSAlexander V. Chernikov 
1992f6990c4eSAlexander V. Chernikov 	IF_AFDATA_RLOCK(ifp);
19931fe201c3SAlexander V. Chernikov 	ln = nd6_lookup(&dst6->sin6_addr, 0, ifp);
1994f6990c4eSAlexander V. Chernikov 	IF_AFDATA_RUNLOCK(ifp);
1995f6990c4eSAlexander V. Chernikov 
1996f6990c4eSAlexander V. Chernikov 	/*
1997f6990c4eSAlexander V. Chernikov 	 * Perform fast path for the following cases:
1998f6990c4eSAlexander V. Chernikov 	 * 1) lle state is REACHABLE
1999*501adf01SAlexander V. Chernikov 	 * 2) lle state is DELAY (NS message sent)
2000f6990c4eSAlexander V. Chernikov 	 *
2001f6990c4eSAlexander V. Chernikov 	 * Every other case involves lle modification, so we handle
2002f6990c4eSAlexander V. Chernikov 	 * them separately.
2003f6990c4eSAlexander V. Chernikov 	 */
2004f6990c4eSAlexander V. Chernikov 	if (ln == NULL || (ln->ln_state != ND6_LLINFO_REACHABLE &&
2005f6990c4eSAlexander V. Chernikov 	    ln->ln_state != ND6_LLINFO_DELAY)) {
2006f6990c4eSAlexander V. Chernikov 		/* Fall back to slow processing path */
2007f6990c4eSAlexander V. Chernikov 		if (ln != NULL)
2008f6990c4eSAlexander V. Chernikov 			LLE_RUNLOCK(ln);
20091fe201c3SAlexander V. Chernikov 		return (nd6_resolve_slow(ifp, m, dst6, desten, pflags));
2010f6990c4eSAlexander V. Chernikov 	}
2011f6990c4eSAlexander V. Chernikov 
2012f6990c4eSAlexander V. Chernikov 
20131fe201c3SAlexander V. Chernikov 	bcopy(&ln->ll_addr, desten, ifp->if_addrlen);
20141fe201c3SAlexander V. Chernikov 	if (pflags != NULL)
20151fe201c3SAlexander V. Chernikov 		*pflags = ln->la_flags;
20161fe201c3SAlexander V. Chernikov 	LLE_RUNLOCK(ln);
20171fe201c3SAlexander V. Chernikov 	return (0);
20186e6b3f7cSQing Li }
20196e6b3f7cSQing Li 
20206e6b3f7cSQing Li 
20216e6b3f7cSQing Li /*
20221fe201c3SAlexander V. Chernikov  * Do L2 address resolution for @sa_dst address. Stores found
20231fe201c3SAlexander V. Chernikov  * address in @desten buffer. Copy of lle ln_flags can be also
20241fe201c3SAlexander V. Chernikov  * saved in @pflags if @pflags is non-NULL.
20256e6b3f7cSQing Li  *
20261fe201c3SAlexander V. Chernikov  * Heavy version.
20271fe201c3SAlexander V. Chernikov  * Function assume that destination LLE does not exist,
20281fe201c3SAlexander V. Chernikov  * is invalid or stale, so ND6_EXCLUSIVE lock needs to be acquired.
20296e6b3f7cSQing Li  */
2030d7968c29SAlexander V. Chernikov static int
20311fe201c3SAlexander V. Chernikov nd6_resolve_slow(struct ifnet *ifp, struct mbuf *m,
20321fe201c3SAlexander V. Chernikov     const struct sockaddr_in6 *dst, u_char *desten, uint32_t *pflags)
20336e6b3f7cSQing Li {
20345a255516SAlexander V. Chernikov 	struct llentry *lle = NULL, *lle_tmp;
203582cd038dSYoshinobu Inoue 
203682cd038dSYoshinobu Inoue 	/*
203782cd038dSYoshinobu Inoue 	 * Address resolution or Neighbor Unreachability Detection
203882cd038dSYoshinobu Inoue 	 * for the next hop.
203982cd038dSYoshinobu Inoue 	 * At this point, the destination of the packet must be a unicast
204082cd038dSYoshinobu Inoue 	 * or an anycast address(i.e. not a multicast).
204182cd038dSYoshinobu Inoue 	 */
2042f6990c4eSAlexander V. Chernikov 	if (lle == NULL) {
2043c445d252SAdrian Chadd 		IF_AFDATA_RLOCK(ifp);
2044f6990c4eSAlexander V. Chernikov 		lle = nd6_lookup(&dst->sin6_addr, ND6_EXCLUSIVE, ifp);
2045c445d252SAdrian Chadd 		IF_AFDATA_RUNLOCK(ifp);
2046f6990c4eSAlexander V. Chernikov 		if ((lle == NULL) && nd6_is_addr_neighbor(dst, ifp))  {
2047686cdd19SJun-ichiro itojun Hagino 			/*
2048686cdd19SJun-ichiro itojun Hagino 			 * Since nd6_is_addr_neighbor() internally calls nd6_lookup(),
2049686cdd19SJun-ichiro itojun Hagino 			 * the condition below is not very efficient.  But we believe
2050686cdd19SJun-ichiro itojun Hagino 			 * it is tolerable, because this should be a rare case.
2051686cdd19SJun-ichiro itojun Hagino 			 */
20525a255516SAlexander V. Chernikov 			lle = nd6_alloc(&dst->sin6_addr, 0, ifp);
2053f6990c4eSAlexander V. Chernikov 			if (lle == NULL) {
20541d54aa3bSBjoern A. Zeeb 				char ip6buf[INET6_ADDRSTRLEN];
2055686cdd19SJun-ichiro itojun Hagino 				log(LOG_DEBUG,
2056686cdd19SJun-ichiro itojun Hagino 				    "nd6_output: can't allocate llinfo for %s "
2057bbd8aebaSQing Li 				    "(ln=%p)\n",
2058f6990c4eSAlexander V. Chernikov 				    ip6_sprintf(ip6buf, &dst->sin6_addr), lle);
20599dffa6a3SAlexander V. Chernikov 				m_freem(m);
20609dffa6a3SAlexander V. Chernikov 				return (ENOBUFS);
206182cd038dSYoshinobu Inoue 			}
20625a255516SAlexander V. Chernikov 			lle->ln_state = ND6_LLINFO_NOSTATE;
20635a255516SAlexander V. Chernikov 
20645a255516SAlexander V. Chernikov 			IF_AFDATA_WLOCK(ifp);
20655a255516SAlexander V. Chernikov 			LLE_WLOCK(lle);
20665a255516SAlexander V. Chernikov 			/* Prefer any existing entry over newly-created one */
20675a255516SAlexander V. Chernikov 			lle_tmp = nd6_lookup(&dst->sin6_addr, ND6_EXCLUSIVE, ifp);
20685a255516SAlexander V. Chernikov 			if (lle_tmp == NULL)
20695a255516SAlexander V. Chernikov 				lltable_link_entry(LLTABLE6(ifp), lle);
20705a255516SAlexander V. Chernikov 			IF_AFDATA_WUNLOCK(ifp);
20715a255516SAlexander V. Chernikov 			if (lle_tmp != NULL) {
20725a255516SAlexander V. Chernikov 				lltable_free_entry(LLTABLE6(ifp), lle);
20735a255516SAlexander V. Chernikov 				lle = lle_tmp;
20745a255516SAlexander V. Chernikov 				lle_tmp = NULL;
20755a255516SAlexander V. Chernikov 			}
20765a255516SAlexander V. Chernikov 		}
20775a255516SAlexander V. Chernikov 	}
20785a255516SAlexander V. Chernikov 	if (lle == NULL) {
20791fe201c3SAlexander V. Chernikov 		if (!(ND_IFINFO(ifp)->flags & ND6_IFF_PERFORMNUD)) {
20805a255516SAlexander V. Chernikov 			m_freem(m);
20815a255516SAlexander V. Chernikov 			return (ENOBUFS);
20825a255516SAlexander V. Chernikov 		}
20831fe201c3SAlexander V. Chernikov 
20841fe201c3SAlexander V. Chernikov 		if (m != NULL)
20851fe201c3SAlexander V. Chernikov 			m_freem(m);
20861fe201c3SAlexander V. Chernikov 		return (ENOBUFS);
2087686cdd19SJun-ichiro itojun Hagino 	}
2088686cdd19SJun-ichiro itojun Hagino 
2089f6990c4eSAlexander V. Chernikov 	LLE_WLOCK_ASSERT(lle);
2090f6990c4eSAlexander V. Chernikov 
209182cd038dSYoshinobu Inoue 	/*
209282cd038dSYoshinobu Inoue 	 * The first time we send a packet to a neighbor whose entry is
209382cd038dSYoshinobu Inoue 	 * STALE, we have to change the state to DELAY and a sets a timer to
209482cd038dSYoshinobu Inoue 	 * expire in DELAY_FIRST_PROBE_TIME seconds to ensure do
209582cd038dSYoshinobu Inoue 	 * neighbor unreachability detection on expiration.
209682cd038dSYoshinobu Inoue 	 * (RFC 2461 7.3.3)
209782cd038dSYoshinobu Inoue 	 */
2098f6990c4eSAlexander V. Chernikov 	if (lle->ln_state == ND6_LLINFO_STALE) {
2099f6990c4eSAlexander V. Chernikov 		lle->la_asked = 0;
2100f6990c4eSAlexander V. Chernikov 		lle->ln_state = ND6_LLINFO_DELAY;
2101f6990c4eSAlexander V. Chernikov 		nd6_llinfo_settimer_locked(lle, (long)V_nd6_delay * hz);
210282cd038dSYoshinobu Inoue 	}
210382cd038dSYoshinobu Inoue 
210482cd038dSYoshinobu Inoue 	/*
210582cd038dSYoshinobu Inoue 	 * If the neighbor cache entry has a state other than INCOMPLETE
210688ff5695SSUZUKI Shinsuke 	 * (i.e. its link-layer address is already resolved), just
210782cd038dSYoshinobu Inoue 	 * send the packet.
210882cd038dSYoshinobu Inoue 	 */
21091fe201c3SAlexander V. Chernikov 	if (lle->ln_state > ND6_LLINFO_INCOMPLETE) {
21101fe201c3SAlexander V. Chernikov 		bcopy(&lle->ll_addr, desten, ifp->if_addrlen);
21111fe201c3SAlexander V. Chernikov 		if (pflags != NULL)
21121fe201c3SAlexander V. Chernikov 			*pflags = lle->la_flags;
21131fe201c3SAlexander V. Chernikov 		LLE_WUNLOCK(lle);
21141fe201c3SAlexander V. Chernikov 		return (0);
21151fe201c3SAlexander V. Chernikov 	}
211682cd038dSYoshinobu Inoue 
211782cd038dSYoshinobu Inoue 	/*
211882cd038dSYoshinobu Inoue 	 * There is a neighbor cache entry, but no ethernet address
2119743eee66SSUZUKI Shinsuke 	 * response yet.  Append this latest packet to the end of the
2120743eee66SSUZUKI Shinsuke 	 * packet queue in the mbuf, unless the number of the packet
2121743eee66SSUZUKI Shinsuke 	 * does not exceed nd6_maxqueuelen.  When it exceeds nd6_maxqueuelen,
2122743eee66SSUZUKI Shinsuke 	 * the oldest packet in the queue will be removed.
212382cd038dSYoshinobu Inoue 	 */
2124f6990c4eSAlexander V. Chernikov 	if (lle->ln_state == ND6_LLINFO_NOSTATE)
2125f6990c4eSAlexander V. Chernikov 		lle->ln_state = ND6_LLINFO_INCOMPLETE;
21266e6b3f7cSQing Li 
2127f6990c4eSAlexander V. Chernikov 	if (lle->la_hold != NULL) {
2128743eee66SSUZUKI Shinsuke 		struct mbuf *m_hold;
2129743eee66SSUZUKI Shinsuke 		int i;
2130743eee66SSUZUKI Shinsuke 
2131743eee66SSUZUKI Shinsuke 		i = 0;
2132f6990c4eSAlexander V. Chernikov 		for (m_hold = lle->la_hold; m_hold; m_hold = m_hold->m_nextpkt){
2133743eee66SSUZUKI Shinsuke 			i++;
2134743eee66SSUZUKI Shinsuke 			if (m_hold->m_nextpkt == NULL) {
2135743eee66SSUZUKI Shinsuke 				m_hold->m_nextpkt = m;
2136743eee66SSUZUKI Shinsuke 				break;
213782cd038dSYoshinobu Inoue 			}
213882cd038dSYoshinobu Inoue 		}
2139603724d3SBjoern A. Zeeb 		while (i >= V_nd6_maxqueuelen) {
2140f6990c4eSAlexander V. Chernikov 			m_hold = lle->la_hold;
2141f6990c4eSAlexander V. Chernikov 			lle->la_hold = lle->la_hold->m_nextpkt;
214231d4137bSSUZUKI Shinsuke 			m_freem(m_hold);
2143743eee66SSUZUKI Shinsuke 			i--;
2144743eee66SSUZUKI Shinsuke 		}
2145743eee66SSUZUKI Shinsuke 	} else {
2146f6990c4eSAlexander V. Chernikov 		lle->la_hold = m;
21476e6b3f7cSQing Li 	}
2148743eee66SSUZUKI Shinsuke 
2149743eee66SSUZUKI Shinsuke 	/*
2150743eee66SSUZUKI Shinsuke 	 * If there has been no NS for the neighbor after entering the
2151743eee66SSUZUKI Shinsuke 	 * INCOMPLETE state, send the first solicitation.
2152743eee66SSUZUKI Shinsuke 	 */
2153f6990c4eSAlexander V. Chernikov 	if (!ND6_LLINFO_PERMANENT(lle) && lle->la_asked == 0) {
215426deb882SAlexander V. Chernikov 		struct in6_addr src, *psrc;
2155f6990c4eSAlexander V. Chernikov 		lle->la_asked++;
21566e6b3f7cSQing Li 
2157f6990c4eSAlexander V. Chernikov 		nd6_llinfo_settimer_locked(lle,
2158743eee66SSUZUKI Shinsuke 		    (long)ND_IFINFO(ifp)->retrans * hz / 1000);
215926deb882SAlexander V. Chernikov 		psrc = nd6_llinfo_get_holdsrc(lle, &src);
2160f6990c4eSAlexander V. Chernikov 		LLE_WUNLOCK(lle);
216126deb882SAlexander V. Chernikov 		nd6_ns_output(ifp, psrc, NULL, &dst->sin6_addr, NULL);
2162d7968c29SAlexander V. Chernikov 	} else {
2163d7968c29SAlexander V. Chernikov 		/* We did the lookup so we need to do the unlock here. */
2164f6990c4eSAlexander V. Chernikov 		LLE_WUNLOCK(lle);
2165743eee66SSUZUKI Shinsuke 	}
2166e6950476SBjoern A. Zeeb 
21671fe201c3SAlexander V. Chernikov 	return (EWOULDBLOCK);
216882cd038dSYoshinobu Inoue }
216982cd038dSYoshinobu Inoue 
21706e6b3f7cSQing Li 
21716e6b3f7cSQing Li int
2172d7968c29SAlexander V. Chernikov nd6_flush_holdchain(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *chain,
21739c9bde01SAlexander V. Chernikov     struct sockaddr_in6 *dst)
21746e6b3f7cSQing Li {
21756e6b3f7cSQing Li 	struct mbuf *m, *m_head;
21766e6b3f7cSQing Li 	struct ifnet *outifp;
21776e6b3f7cSQing Li 	int error = 0;
21786e6b3f7cSQing Li 
21796e6b3f7cSQing Li 	m_head = chain;
21806e6b3f7cSQing Li 	if ((ifp->if_flags & IFF_LOOPBACK) != 0)
21816e6b3f7cSQing Li 		outifp = origifp;
21826e6b3f7cSQing Li 	else
21836e6b3f7cSQing Li 		outifp = ifp;
21846e6b3f7cSQing Li 
21856e6b3f7cSQing Li 	while (m_head) {
21866e6b3f7cSQing Li 		m = m_head;
21876e6b3f7cSQing Li 		m_head = m_head->m_nextpkt;
2188d7968c29SAlexander V. Chernikov 		error = nd6_output_ifp(ifp, origifp, m, dst);
21896e6b3f7cSQing Li 	}
21906e6b3f7cSQing Li 
21916e6b3f7cSQing Li 	/*
21926e6b3f7cSQing Li 	 * XXX
21931fe201c3SAlexander V. Chernikov 	 * note that intermediate errors are blindly ignored
21946e6b3f7cSQing Li 	 */
21956e6b3f7cSQing Li 	return (error);
21966e6b3f7cSQing Li }
21976e6b3f7cSQing Li 
21981fe201c3SAlexander V. Chernikov static int
21991272577eSXin LI nd6_need_cache(struct ifnet *ifp)
220033841545SHajimu UMEMOTO {
220133841545SHajimu UMEMOTO 	/*
220233841545SHajimu UMEMOTO 	 * XXX: we currently do not make neighbor cache on any interface
220333841545SHajimu UMEMOTO 	 * other than ARCnet, Ethernet, FDDI and GIF.
220433841545SHajimu UMEMOTO 	 *
220533841545SHajimu UMEMOTO 	 * RFC2893 says:
220633841545SHajimu UMEMOTO 	 * - unidirectional tunnels needs no ND
220733841545SHajimu UMEMOTO 	 */
220833841545SHajimu UMEMOTO 	switch (ifp->if_type) {
220933841545SHajimu UMEMOTO 	case IFT_ARCNET:
221033841545SHajimu UMEMOTO 	case IFT_ETHER:
221133841545SHajimu UMEMOTO 	case IFT_FDDI:
221233841545SHajimu UMEMOTO 	case IFT_IEEE1394:
221305b6760dSMunechika SUMIKAWA 	case IFT_L2VLAN:
221433841545SHajimu UMEMOTO 	case IFT_IEEE80211:
2215e4cd31ddSJeff Roberson 	case IFT_INFINIBAND:
221659280079SAndrew Thompson 	case IFT_BRIDGE:
2217c57086ceSHajimu UMEMOTO 	case IFT_PROPVIRTUAL:
221833841545SHajimu UMEMOTO 		return (1);
221933841545SHajimu UMEMOTO 	default:
222033841545SHajimu UMEMOTO 		return (0);
222133841545SHajimu UMEMOTO 	}
222233841545SHajimu UMEMOTO }
222333841545SHajimu UMEMOTO 
22246e6b3f7cSQing Li /*
2225f6b84910SAlexander V. Chernikov  * Add pernament ND6 link-layer record for given
2226f6b84910SAlexander V. Chernikov  * interface address.
2227f6b84910SAlexander V. Chernikov  *
2228f6b84910SAlexander V. Chernikov  * Very similar to IPv4 arp_ifinit(), but:
2229f6b84910SAlexander V. Chernikov  * 1) IPv6 DAD is performed in different place
2230f6b84910SAlexander V. Chernikov  * 2) It is called by IPv6 protocol stack in contrast to
2231f6b84910SAlexander V. Chernikov  * arp_ifinit() which is typically called in SIOCSIFADDR
2232f6b84910SAlexander V. Chernikov  * driver ioctl handler.
2233f6b84910SAlexander V. Chernikov  *
2234f6b84910SAlexander V. Chernikov  */
2235f6b84910SAlexander V. Chernikov int
2236f6b84910SAlexander V. Chernikov nd6_add_ifa_lle(struct in6_ifaddr *ia)
2237f6b84910SAlexander V. Chernikov {
2238f6b84910SAlexander V. Chernikov 	struct ifnet *ifp;
22395a255516SAlexander V. Chernikov 	struct llentry *ln, *ln_tmp;
22405a255516SAlexander V. Chernikov 	struct sockaddr *dst;
2241f6b84910SAlexander V. Chernikov 
2242f6b84910SAlexander V. Chernikov 	ifp = ia->ia_ifa.ifa_ifp;
2243af6209a1SAndrey V. Elsukov 	if (nd6_need_cache(ifp) == 0)
2244af6209a1SAndrey V. Elsukov 		return (0);
22455a255516SAlexander V. Chernikov 
2246f6b84910SAlexander V. Chernikov 	ia->ia_ifa.ifa_rtrequest = nd6_rtrequest;
22475a255516SAlexander V. Chernikov 	dst = (struct sockaddr *)&ia->ia_addr;
22485a255516SAlexander V. Chernikov 	ln = lltable_alloc_entry(LLTABLE6(ifp), LLE_IFADDR, dst);
22495a255516SAlexander V. Chernikov 	if (ln == NULL)
22505a255516SAlexander V. Chernikov 		return (ENOBUFS);
22515a255516SAlexander V. Chernikov 
22525a255516SAlexander V. Chernikov 	IF_AFDATA_WLOCK(ifp);
22535a255516SAlexander V. Chernikov 	LLE_WLOCK(ln);
22545a255516SAlexander V. Chernikov 	/* Unlink any entry if exists */
22555a255516SAlexander V. Chernikov 	ln_tmp = lla_lookup(LLTABLE6(ifp), LLE_EXCLUSIVE, dst);
22565a255516SAlexander V. Chernikov 	if (ln_tmp != NULL)
22575a255516SAlexander V. Chernikov 		lltable_unlink_entry(LLTABLE6(ifp), ln_tmp);
22585a255516SAlexander V. Chernikov 	lltable_link_entry(LLTABLE6(ifp), ln);
22595a255516SAlexander V. Chernikov 	IF_AFDATA_WUNLOCK(ifp);
22605a255516SAlexander V. Chernikov 
22615a255516SAlexander V. Chernikov 	if (ln_tmp != NULL)
22625a255516SAlexander V. Chernikov 		EVENTHANDLER_INVOKE(lle_event, ln_tmp, LLENTRY_EXPIRED);
22635a255516SAlexander V. Chernikov 	EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
22645a255516SAlexander V. Chernikov 
22655a255516SAlexander V. Chernikov 	LLE_WUNLOCK(ln);
22665a255516SAlexander V. Chernikov 	if (ln_tmp != NULL)
22675a255516SAlexander V. Chernikov 		llentry_free(ln_tmp);
22685a255516SAlexander V. Chernikov 
22695a255516SAlexander V. Chernikov 	return (0);
2270f6b84910SAlexander V. Chernikov }
2271f6b84910SAlexander V. Chernikov 
2272f6b84910SAlexander V. Chernikov /*
22733e7a2321SAlexander V. Chernikov  * Removes either all lle entries for given @ia, or lle
22743e7a2321SAlexander V. Chernikov  * corresponding to @ia address.
2275f6b84910SAlexander V. Chernikov  */
2276f6b84910SAlexander V. Chernikov void
22773e7a2321SAlexander V. Chernikov nd6_rem_ifa_lle(struct in6_ifaddr *ia, int all)
2278f6b84910SAlexander V. Chernikov {
2279f6b84910SAlexander V. Chernikov 	struct sockaddr_in6 mask, addr;
22803e7a2321SAlexander V. Chernikov 	struct sockaddr *saddr, *smask;
2281f6b84910SAlexander V. Chernikov 	struct ifnet *ifp;
2282f6b84910SAlexander V. Chernikov 
2283f6b84910SAlexander V. Chernikov 	ifp = ia->ia_ifa.ifa_ifp;
2284f6b84910SAlexander V. Chernikov 	memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
2285f6b84910SAlexander V. Chernikov 	memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
22863e7a2321SAlexander V. Chernikov 	saddr = (struct sockaddr *)&addr;
22873e7a2321SAlexander V. Chernikov 	smask = (struct sockaddr *)&mask;
22883e7a2321SAlexander V. Chernikov 
22893e7a2321SAlexander V. Chernikov 	if (all != 0)
22903e7a2321SAlexander V. Chernikov 		lltable_prefix_free(AF_INET6, saddr, smask, LLE_STATIC);
22913e7a2321SAlexander V. Chernikov 	else
22923e7a2321SAlexander V. Chernikov 		lltable_delete_addr(LLTABLE6(ifp), LLE_IFADDR, saddr);
2293f6b84910SAlexander V. Chernikov }
2294f6b84910SAlexander V. Chernikov 
229531d4137bSSUZUKI Shinsuke static void
22966e6b3f7cSQing Li clear_llinfo_pqueue(struct llentry *ln)
229731d4137bSSUZUKI Shinsuke {
229831d4137bSSUZUKI Shinsuke 	struct mbuf *m_hold, *m_hold_next;
229931d4137bSSUZUKI Shinsuke 
23006e6b3f7cSQing Li 	for (m_hold = ln->la_hold; m_hold; m_hold = m_hold_next) {
230131d4137bSSUZUKI Shinsuke 		m_hold_next = m_hold->m_nextpkt;
230231d4137bSSUZUKI Shinsuke 		m_freem(m_hold);
230331d4137bSSUZUKI Shinsuke 	}
230431d4137bSSUZUKI Shinsuke 
23056e6b3f7cSQing Li 	ln->la_hold = NULL;
230631d4137bSSUZUKI Shinsuke 	return;
230731d4137bSSUZUKI Shinsuke }
230831d4137bSSUZUKI Shinsuke 
230933841545SHajimu UMEMOTO static int nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS);
231033841545SHajimu UMEMOTO static int nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS);
231133841545SHajimu UMEMOTO #ifdef SYSCTL_DECL
231233841545SHajimu UMEMOTO SYSCTL_DECL(_net_inet6_icmp6);
231333841545SHajimu UMEMOTO #endif
231433841545SHajimu UMEMOTO SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist,
231533841545SHajimu UMEMOTO 	CTLFLAG_RD, nd6_sysctl_drlist, "");
231633841545SHajimu UMEMOTO SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_PRLIST, nd6_prlist,
231733841545SHajimu UMEMOTO 	CTLFLAG_RD, nd6_sysctl_prlist, "");
23186df8a710SGleb Smirnoff SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MAXQLEN, nd6_maxqueuelen,
23196df8a710SGleb Smirnoff 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_maxqueuelen), 1, "");
23206df8a710SGleb Smirnoff SYSCTL_INT(_net_inet6_icmp6, OID_AUTO, nd6_gctimer,
23216df8a710SGleb Smirnoff 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_gctimer), (60 * 60 * 24), "");
232233841545SHajimu UMEMOTO 
232333841545SHajimu UMEMOTO static int
232433841545SHajimu UMEMOTO nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS)
232533841545SHajimu UMEMOTO {
23267195094cSMarius Strobl 	struct in6_defrouter d;
232733841545SHajimu UMEMOTO 	struct nd_defrouter *dr;
23287195094cSMarius Strobl 	int error;
232933841545SHajimu UMEMOTO 
233033841545SHajimu UMEMOTO 	if (req->newptr)
23317195094cSMarius Strobl 		return (EPERM);
233233841545SHajimu UMEMOTO 
23337195094cSMarius Strobl 	bzero(&d, sizeof(d));
23347195094cSMarius Strobl 	d.rtaddr.sin6_family = AF_INET6;
23357195094cSMarius Strobl 	d.rtaddr.sin6_len = sizeof(d.rtaddr);
23367195094cSMarius Strobl 
23377195094cSMarius Strobl 	/*
23387195094cSMarius Strobl 	 * XXX locking
23397195094cSMarius Strobl 	 */
23403b0b2840SJohn Baldwin 	TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
23417195094cSMarius Strobl 		d.rtaddr.sin6_addr = dr->rtaddr;
23427195094cSMarius Strobl 		error = sa6_recoverscope(&d.rtaddr);
2343edbb8b46SPeter Wemm 		if (error != 0)
2344b2630c29SGeorge V. Neville-Neil 			return (error);
23457195094cSMarius Strobl 		d.flags = dr->flags;
23467195094cSMarius Strobl 		d.rtlifetime = dr->rtlifetime;
2347ffa0165aSHiroki Sato 		d.expire = dr->expire + (time_second - time_uptime);
23487195094cSMarius Strobl 		d.if_index = dr->ifp->if_index;
23497195094cSMarius Strobl 		error = SYSCTL_OUT(req, &d, sizeof(d));
23507195094cSMarius Strobl 		if (error != 0)
235107eb2995SHajimu UMEMOTO 			return (error);
235233841545SHajimu UMEMOTO 	}
23537195094cSMarius Strobl 	return (0);
23547195094cSMarius Strobl }
235533841545SHajimu UMEMOTO 
235633841545SHajimu UMEMOTO static int
235733841545SHajimu UMEMOTO nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS)
235833841545SHajimu UMEMOTO {
23597195094cSMarius Strobl 	struct in6_prefix p;
23607195094cSMarius Strobl 	struct sockaddr_in6 s6;
236133841545SHajimu UMEMOTO 	struct nd_prefix *pr;
23627195094cSMarius Strobl 	struct nd_pfxrouter *pfr;
23637195094cSMarius Strobl 	time_t maxexpire;
23647195094cSMarius Strobl 	int error;
23651d54aa3bSBjoern A. Zeeb 	char ip6buf[INET6_ADDRSTRLEN];
236633841545SHajimu UMEMOTO 
236733841545SHajimu UMEMOTO 	if (req->newptr)
23687195094cSMarius Strobl 		return (EPERM);
236933841545SHajimu UMEMOTO 
23707195094cSMarius Strobl 	bzero(&p, sizeof(p));
23717195094cSMarius Strobl 	p.origin = PR_ORIG_RA;
23727195094cSMarius Strobl 	bzero(&s6, sizeof(s6));
23737195094cSMarius Strobl 	s6.sin6_family = AF_INET6;
23747195094cSMarius Strobl 	s6.sin6_len = sizeof(s6);
23757195094cSMarius Strobl 
23767195094cSMarius Strobl 	/*
23777195094cSMarius Strobl 	 * XXX locking
23787195094cSMarius Strobl 	 */
23793b0b2840SJohn Baldwin 	LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
23807195094cSMarius Strobl 		p.prefix = pr->ndpr_prefix;
23817195094cSMarius Strobl 		if (sa6_recoverscope(&p.prefix)) {
23827195094cSMarius Strobl 			log(LOG_ERR, "scope error in prefix list (%s)\n",
23837195094cSMarius Strobl 			    ip6_sprintf(ip6buf, &p.prefix.sin6_addr));
2384a1f7e5f8SHajimu UMEMOTO 			/* XXX: press on... */
2385a1f7e5f8SHajimu UMEMOTO 		}
23867195094cSMarius Strobl 		p.raflags = pr->ndpr_raf;
23877195094cSMarius Strobl 		p.prefixlen = pr->ndpr_plen;
23887195094cSMarius Strobl 		p.vltime = pr->ndpr_vltime;
23897195094cSMarius Strobl 		p.pltime = pr->ndpr_pltime;
23907195094cSMarius Strobl 		p.if_index = pr->ndpr_ifp->if_index;
2391743eee66SSUZUKI Shinsuke 		if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME)
23927195094cSMarius Strobl 			p.expire = 0;
2393743eee66SSUZUKI Shinsuke 		else {
2394743eee66SSUZUKI Shinsuke 			/* XXX: we assume time_t is signed. */
2395743eee66SSUZUKI Shinsuke 			maxexpire = (-1) &
23967195094cSMarius Strobl 			    ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
23977195094cSMarius Strobl 			if (pr->ndpr_vltime < maxexpire - pr->ndpr_lastupdate)
23987195094cSMarius Strobl 				p.expire = pr->ndpr_lastupdate +
2399ffa0165aSHiroki Sato 				    pr->ndpr_vltime +
2400ffa0165aSHiroki Sato 				    (time_second - time_uptime);
24017195094cSMarius Strobl 			else
24027195094cSMarius Strobl 				p.expire = maxexpire;
2403743eee66SSUZUKI Shinsuke 		}
24047195094cSMarius Strobl 		p.refcnt = pr->ndpr_refcnt;
24057195094cSMarius Strobl 		p.flags = pr->ndpr_stateflags;
24067195094cSMarius Strobl 		p.advrtrs = 0;
24077195094cSMarius Strobl 		LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry)
24087195094cSMarius Strobl 			p.advrtrs++;
24097195094cSMarius Strobl 		error = SYSCTL_OUT(req, &p, sizeof(p));
24107195094cSMarius Strobl 		if (error != 0)
241107eb2995SHajimu UMEMOTO 			return (error);
24127195094cSMarius Strobl 		LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) {
24137195094cSMarius Strobl 			s6.sin6_addr = pfr->router->rtaddr;
24147195094cSMarius Strobl 			if (sa6_recoverscope(&s6))
24157195094cSMarius Strobl 				log(LOG_ERR,
24167195094cSMarius Strobl 				    "scope error in prefix list (%s)\n",
24177195094cSMarius Strobl 				    ip6_sprintf(ip6buf, &pfr->router->rtaddr));
24187195094cSMarius Strobl 			error = SYSCTL_OUT(req, &s6, sizeof(s6));
24197195094cSMarius Strobl 			if (error != 0)
24207195094cSMarius Strobl 				return (error);
24217195094cSMarius Strobl 		}
24227195094cSMarius Strobl 	}
24237195094cSMarius Strobl 	return (0);
242433841545SHajimu UMEMOTO }
2425