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1a75e3b20f
freebsd-nq/sys/netinet6/nd6.c
Alexander V. Chernikov 1a75e3b20f Make checks for rt_mtu generic: 
Some virtual if drivers has (ab)used ifa ifa_rtrequest hook to enforce
route MTU to be not bigger that interface MTU. While ifa_rtrequest hooking
might be an option in some situation, it is not feasible to do MTU checks
there: generic (or per-domain) routing code is perfectly capable of doing
this.

We currrently have 3 places where MTU is altered:

1) route addition.
 In this case domain overrides radix _addroute callback (in[6]_addroute)
 and all necessary checks/fixes are/can be done there.

2) route change (especially, GW change).
 In this case, there are no explicit per-domain calls, but one can
 override rte by setting ifa_rtrequest hook to domain handler
 (inet6 does this).

3) ifconfig ifaceX mtu YYYY
 In this case, we have no callbacks, but ip[6]_output performes runtime
 checks and decreases rt_mtu if necessary.

Generally, the goals are to be able to handle all MTU changes in
 control plane, not in runtime part, and properly deal with increased
 interface MTU.

This commit changes the following:
* removes hooks setting MTU from drivers side
* adds proper per-doman MTU checks for case 1)
* adds generic MTU check for case 2)

* The latter is done by using new dom_ifmtu callback since
 if_mtu denotes L3 interface MTU, e.g. maximum trasmitted _packet_ size.
 However, IPv6 mtu might be different from if_mtu one (e.g. default 1280)
 for some cases, so we need an abstract way to know maximum MTU size
 for given interface and domain.
* moves rt_setmetrics() before MTU/ifa_rtrequest hooks since it copies
  user-supplied data which must be checked.
* removes RT_LOCK_ASSERT() from other ifa_rtrequest hooks to be able to
  use this functions on new non-inserted rte.

More changes will follow soon.

MFC after:	1 month
Sponsored by:	Yandex LLC
2014-11-06 13:13:09 +00:00

2476 lines
62 KiB
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/*-
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $KAME: nd6.c,v 1.144 2001/05/24 07:44:00 itojun Exp $
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_inet.h"
#include "opt_inet6.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/callout.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/protosw.h>
#include <sys/errno.h>
#include <sys/syslog.h>
#include <sys/lock.h>
#include <sys/rwlock.h>
#include <sys/queue.h>
#include <sys/sdt.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_arc.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/iso88025.h>
#include <net/fddi.h>
#include <net/route.h>
#include <net/vnet.h>
#include <netinet/in.h>
#include <netinet/in_kdtrace.h>
#include <net/if_llatbl.h>
#define L3_ADDR_SIN6(le) ((struct sockaddr_in6 *) L3_ADDR(le))
#include <netinet/if_ether.h>
#include <netinet6/in6_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/scope6_var.h>
#include <netinet6/nd6.h>
#include <netinet6/in6_ifattach.h>
#include <netinet/icmp6.h>
#include <netinet6/send.h>
#include <sys/limits.h>
#include <security/mac/mac_framework.h>
#define ND6_SLOWTIMER_INTERVAL (60 * 60) /* 1 hour */
#define ND6_RECALC_REACHTM_INTERVAL (60 * 120) /* 2 hours */
#define SIN6(s) ((const struct sockaddr_in6 *)(s))
/* timer values */
VNET_DEFINE(int, nd6_prune) = 1; /* walk list every 1 seconds */
VNET_DEFINE(int, nd6_delay) = 5; /* delay first probe time 5 second */
VNET_DEFINE(int, nd6_umaxtries) = 3; /* maximum unicast query */
VNET_DEFINE(int, nd6_mmaxtries) = 3; /* maximum multicast query */
VNET_DEFINE(int, nd6_useloopback) = 1; /* use loopback interface for
* local traffic */
VNET_DEFINE(int, nd6_gctimer) = (60 * 60 * 24); /* 1 day: garbage
* collection timer */
/* preventing too many loops in ND option parsing */
static VNET_DEFINE(int, nd6_maxndopt) = 10; /* max # of ND options allowed */
VNET_DEFINE(int, nd6_maxnudhint) = 0; /* max # of subsequent upper
* layer hints */
static VNET_DEFINE(int, nd6_maxqueuelen) = 1; /* max pkts cached in unresolved
* ND entries */
#define V_nd6_maxndopt VNET(nd6_maxndopt)
#define V_nd6_maxqueuelen VNET(nd6_maxqueuelen)
#ifdef ND6_DEBUG
VNET_DEFINE(int, nd6_debug) = 1;
#else
VNET_DEFINE(int, nd6_debug) = 0;
#endif
/* for debugging? */
#if 0
static int nd6_inuse, nd6_allocated;
#endif
VNET_DEFINE(struct nd_drhead, nd_defrouter);
VNET_DEFINE(struct nd_prhead, nd_prefix);
VNET_DEFINE(int, nd6_recalc_reachtm_interval) = ND6_RECALC_REACHTM_INTERVAL;
#define V_nd6_recalc_reachtm_interval VNET(nd6_recalc_reachtm_interval)
int (*send_sendso_input_hook)(struct mbuf *, struct ifnet *, int, int);
static int nd6_is_new_addr_neighbor(struct sockaddr_in6 *,
struct ifnet *);
static void nd6_setmtu0(struct ifnet *, struct nd_ifinfo *);
static void nd6_slowtimo(void *);
static int regen_tmpaddr(struct in6_ifaddr *);
static struct llentry *nd6_free(struct llentry *, int);
static void nd6_llinfo_timer(void *);
static void clear_llinfo_pqueue(struct llentry *);
static void nd6_rtrequest(int, struct rtentry *, struct rt_addrinfo *);
static VNET_DEFINE(struct callout, nd6_slowtimo_ch);
#define V_nd6_slowtimo_ch VNET(nd6_slowtimo_ch)
VNET_DEFINE(struct callout, nd6_timer_ch);
void
nd6_init(void)
{
LIST_INIT(&V_nd_prefix);
/* initialization of the default router list */
TAILQ_INIT(&V_nd_defrouter);
/* start timer */
callout_init(&V_nd6_slowtimo_ch, 0);
callout_reset(&V_nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,
nd6_slowtimo, curvnet);
}
#ifdef VIMAGE
void
nd6_destroy()
{
callout_drain(&V_nd6_slowtimo_ch);
callout_drain(&V_nd6_timer_ch);
}
#endif
struct nd_ifinfo *
nd6_ifattach(struct ifnet *ifp)
{
struct nd_ifinfo *nd;
nd = (struct nd_ifinfo *)malloc(sizeof(*nd), M_IP6NDP, M_WAITOK|M_ZERO);
nd->initialized = 1;
nd->chlim = IPV6_DEFHLIM;
nd->basereachable = REACHABLE_TIME;
nd->reachable = ND_COMPUTE_RTIME(nd->basereachable);
nd->retrans = RETRANS_TIMER;
nd->flags = ND6_IFF_PERFORMNUD;
/* A loopback interface always has ND6_IFF_AUTO_LINKLOCAL.
* XXXHRS: Clear ND6_IFF_AUTO_LINKLOCAL on an IFT_BRIDGE interface by
* default regardless of the V_ip6_auto_linklocal configuration to
* give a reasonable default behavior.
*/
if ((V_ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) ||
(ifp->if_flags & IFF_LOOPBACK))
nd->flags |= ND6_IFF_AUTO_LINKLOCAL;
/*
* A loopback interface does not need to accept RTADV.
* XXXHRS: Clear ND6_IFF_ACCEPT_RTADV on an IFT_BRIDGE interface by
* default regardless of the V_ip6_accept_rtadv configuration to
* prevent the interface from accepting RA messages arrived
* on one of the member interfaces with ND6_IFF_ACCEPT_RTADV.
*/
if (V_ip6_accept_rtadv &&
!(ifp->if_flags & IFF_LOOPBACK) &&
(ifp->if_type != IFT_BRIDGE))
nd->flags |= ND6_IFF_ACCEPT_RTADV;
if (V_ip6_no_radr && !(ifp->if_flags & IFF_LOOPBACK))
nd->flags |= ND6_IFF_NO_RADR;
/* XXX: we cannot call nd6_setmtu since ifp is not fully initialized */
nd6_setmtu0(ifp, nd);
return nd;
}
void
nd6_ifdetach(struct nd_ifinfo *nd)
{
free(nd, M_IP6NDP);
}
/*
* Reset ND level link MTU. This function is called when the physical MTU
* changes, which means we might have to adjust the ND level MTU.
*/
void
nd6_setmtu(struct ifnet *ifp)
{
nd6_setmtu0(ifp, ND_IFINFO(ifp));
}
/* XXX todo: do not maintain copy of ifp->if_mtu in ndi->maxmtu */
void
nd6_setmtu0(struct ifnet *ifp, struct nd_ifinfo *ndi)
{
u_int32_t omaxmtu;
omaxmtu = ndi->maxmtu;
switch (ifp->if_type) {
case IFT_ARCNET:
ndi->maxmtu = MIN(ARC_PHDS_MAXMTU, ifp->if_mtu); /* RFC2497 */
break;
case IFT_FDDI:
ndi->maxmtu = MIN(FDDIIPMTU, ifp->if_mtu); /* RFC2467 */
break;
case IFT_ISO88025:
ndi->maxmtu = MIN(ISO88025_MAX_MTU, ifp->if_mtu);
break;
default:
ndi->maxmtu = ifp->if_mtu;
break;
}
/*
* Decreasing the interface MTU under IPV6 minimum MTU may cause
* undesirable situation. We thus notify the operator of the change
* explicitly. The check for omaxmtu is necessary to restrict the
* log to the case of changing the MTU, not initializing it.
*/
if (omaxmtu >= IPV6_MMTU && ndi->maxmtu < IPV6_MMTU) {
log(LOG_NOTICE, "nd6_setmtu0: "
"new link MTU on %s (%lu) is too small for IPv6\n",
if_name(ifp), (unsigned long)ndi->maxmtu);
}
if (ndi->maxmtu > V_in6_maxmtu)
in6_setmaxmtu(); /* check all interfaces just in case */
}
void
nd6_option_init(void *opt, int icmp6len, union nd_opts *ndopts)
{
bzero(ndopts, sizeof(*ndopts));
ndopts->nd_opts_search = (struct nd_opt_hdr *)opt;
ndopts->nd_opts_last
= (struct nd_opt_hdr *)(((u_char *)opt) + icmp6len);
if (icmp6len == 0) {
ndopts->nd_opts_done = 1;
ndopts->nd_opts_search = NULL;
}
}
/*
* Take one ND option.
*/
struct nd_opt_hdr *
nd6_option(union nd_opts *ndopts)
{
struct nd_opt_hdr *nd_opt;
int olen;
KASSERT(ndopts != NULL, ("%s: ndopts == NULL", __func__));
KASSERT(ndopts->nd_opts_last != NULL, ("%s: uninitialized ndopts",
__func__));
if (ndopts->nd_opts_search == NULL)
return NULL;
if (ndopts->nd_opts_done)
return NULL;
nd_opt = ndopts->nd_opts_search;
/* make sure nd_opt_len is inside the buffer */
if ((caddr_t)&nd_opt->nd_opt_len >= (caddr_t)ndopts->nd_opts_last) {
bzero(ndopts, sizeof(*ndopts));
return NULL;
}
olen = nd_opt->nd_opt_len << 3;
if (olen == 0) {
/*
* Message validation requires that all included
* options have a length that is greater than zero.
*/
bzero(ndopts, sizeof(*ndopts));
return NULL;
}
ndopts->nd_opts_search = (struct nd_opt_hdr *)((caddr_t)nd_opt + olen);
if (ndopts->nd_opts_search > ndopts->nd_opts_last) {
/* option overruns the end of buffer, invalid */
bzero(ndopts, sizeof(*ndopts));
return NULL;
} else if (ndopts->nd_opts_search == ndopts->nd_opts_last) {
/* reached the end of options chain */
ndopts->nd_opts_done = 1;
ndopts->nd_opts_search = NULL;
}
return nd_opt;
}
/*
* Parse multiple ND options.
* This function is much easier to use, for ND routines that do not need
* multiple options of the same type.
*/
int
nd6_options(union nd_opts *ndopts)
{
struct nd_opt_hdr *nd_opt;
int i = 0;
KASSERT(ndopts != NULL, ("%s: ndopts == NULL", __func__));
KASSERT(ndopts->nd_opts_last != NULL, ("%s: uninitialized ndopts",
__func__));
if (ndopts->nd_opts_search == NULL)
return 0;
while (1) {
nd_opt = nd6_option(ndopts);
if (nd_opt == NULL && ndopts->nd_opts_last == NULL) {
/*
* Message validation requires that all included
* options have a length that is greater than zero.
*/
ICMP6STAT_INC(icp6s_nd_badopt);
bzero(ndopts, sizeof(*ndopts));
return -1;
}
if (nd_opt == NULL)
goto skip1;
switch (nd_opt->nd_opt_type) {
case ND_OPT_SOURCE_LINKADDR:
case ND_OPT_TARGET_LINKADDR:
case ND_OPT_MTU:
case ND_OPT_REDIRECTED_HEADER:
if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
nd6log((LOG_INFO,
"duplicated ND6 option found (type=%d)\n",
nd_opt->nd_opt_type));
/* XXX bark? */
} else {
ndopts->nd_opt_array[nd_opt->nd_opt_type]
= nd_opt;
}
break;
case ND_OPT_PREFIX_INFORMATION:
if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) {
ndopts->nd_opt_array[nd_opt->nd_opt_type]
= nd_opt;
}
ndopts->nd_opts_pi_end =
(struct nd_opt_prefix_info *)nd_opt;
break;
/* What about ND_OPT_ROUTE_INFO? RFC 4191 */
case ND_OPT_RDNSS: /* RFC 6106 */
case ND_OPT_DNSSL: /* RFC 6106 */
/*
* Silently ignore options we know and do not care about
* in the kernel.
*/
break;
default:
/*
* Unknown options must be silently ignored,
* to accomodate future extension to the protocol.
*/
nd6log((LOG_DEBUG,
"nd6_options: unsupported option %d - "
"option ignored\n", nd_opt->nd_opt_type));
}
skip1:
i++;
if (i > V_nd6_maxndopt) {
ICMP6STAT_INC(icp6s_nd_toomanyopt);
nd6log((LOG_INFO, "too many loop in nd opt\n"));
break;
}
if (ndopts->nd_opts_done)
break;
}
return 0;
}
/*
* ND6 timer routine to handle ND6 entries
*/
void
nd6_llinfo_settimer_locked(struct llentry *ln, long tick)
{
int canceled;
LLE_WLOCK_ASSERT(ln);
if (tick < 0) {
ln->la_expire = 0;
ln->ln_ntick = 0;
canceled = callout_stop(&ln->ln_timer_ch);
} else {
ln->la_expire = time_uptime + tick / hz;
LLE_ADDREF(ln);
if (tick > INT_MAX) {
ln->ln_ntick = tick - INT_MAX;
canceled = callout_reset(&ln->ln_timer_ch, INT_MAX,
nd6_llinfo_timer, ln);
} else {
ln->ln_ntick = 0;
canceled = callout_reset(&ln->ln_timer_ch, tick,
nd6_llinfo_timer, ln);
}
}
if (canceled)
LLE_REMREF(ln);
}
void
nd6_llinfo_settimer(struct llentry *ln, long tick)
{
LLE_WLOCK(ln);
nd6_llinfo_settimer_locked(ln, tick);
LLE_WUNLOCK(ln);
}
static void
nd6_llinfo_timer(void *arg)
{
struct llentry *ln;
struct in6_addr *dst;
struct ifnet *ifp;
struct nd_ifinfo *ndi = NULL;
KASSERT(arg != NULL, ("%s: arg NULL", __func__));
ln = (struct llentry *)arg;
LLE_WLOCK_ASSERT(ln);
ifp = ln->lle_tbl->llt_ifp;
CURVNET_SET(ifp->if_vnet);
if (ln->ln_ntick > 0) {
if (ln->ln_ntick > INT_MAX) {
ln->ln_ntick -= INT_MAX;
nd6_llinfo_settimer_locked(ln, INT_MAX);
} else {
ln->ln_ntick = 0;
nd6_llinfo_settimer_locked(ln, ln->ln_ntick);
}
goto done;
}
ndi = ND_IFINFO(ifp);
dst = &L3_ADDR_SIN6(ln)->sin6_addr;
if (ln->la_flags & LLE_STATIC) {
goto done;
}
if (ln->la_flags & LLE_DELETED) {
(void)nd6_free(ln, 0);
ln = NULL;
goto done;
}
switch (ln->ln_state) {
case ND6_LLINFO_INCOMPLETE:
if (ln->la_asked < V_nd6_mmaxtries) {
ln->la_asked++;
nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
LLE_WUNLOCK(ln);
nd6_ns_output(ifp, NULL, dst, ln, 0);
LLE_WLOCK(ln);
} else {
struct mbuf *m = ln->la_hold;
if (m) {
struct mbuf *m0;
/*
* assuming every packet in la_hold has the
* same IP header. Send error after unlock.
*/
m0 = m->m_nextpkt;
m->m_nextpkt = NULL;
ln->la_hold = m0;
clear_llinfo_pqueue(ln);
}
EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_TIMEDOUT);
(void)nd6_free(ln, 0);
ln = NULL;
if (m != NULL)
icmp6_error2(m, ICMP6_DST_UNREACH,
ICMP6_DST_UNREACH_ADDR, 0, ifp);
}
break;
case ND6_LLINFO_REACHABLE:
if (!ND6_LLINFO_PERMANENT(ln)) {
ln->ln_state = ND6_LLINFO_STALE;
nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
}
break;
case ND6_LLINFO_STALE:
/* Garbage Collection(RFC 2461 5.3) */
if (!ND6_LLINFO_PERMANENT(ln)) {
EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_EXPIRED);
(void)nd6_free(ln, 1);
ln = NULL;
}
break;
case ND6_LLINFO_DELAY:
if (ndi && (ndi->flags & ND6_IFF_PERFORMNUD) != 0) {
/* We need NUD */
ln->la_asked = 1;
ln->ln_state = ND6_LLINFO_PROBE;
nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
LLE_WUNLOCK(ln);
nd6_ns_output(ifp, dst, dst, ln, 0);
LLE_WLOCK(ln);
} else {
ln->ln_state = ND6_LLINFO_STALE; /* XXX */
nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
}
break;
case ND6_LLINFO_PROBE:
if (ln->la_asked < V_nd6_umaxtries) {
ln->la_asked++;
nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
LLE_WUNLOCK(ln);
nd6_ns_output(ifp, dst, dst, ln, 0);
LLE_WLOCK(ln);
} else {
EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_EXPIRED);
(void)nd6_free(ln, 0);
ln = NULL;
}
break;
default:
panic("%s: paths in a dark night can be confusing: %d",
__func__, ln->ln_state);
}
done:
if (ln != NULL)
LLE_FREE_LOCKED(ln);
CURVNET_RESTORE();
}
/*
* ND6 timer routine to expire default route list and prefix list
*/
void
nd6_timer(void *arg)
{
CURVNET_SET((struct vnet *) arg);
struct nd_defrouter *dr, *ndr;
struct nd_prefix *pr, *npr;
struct in6_ifaddr *ia6, *nia6;
callout_reset(&V_nd6_timer_ch, V_nd6_prune * hz,
nd6_timer, curvnet);
/* expire default router list */
TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
if (dr->expire && dr->expire < time_uptime)
defrtrlist_del(dr);
}
/*
* expire interface addresses.
* in the past the loop was inside prefix expiry processing.
* However, from a stricter speci-confrmance standpoint, we should
* rather separate address lifetimes and prefix lifetimes.
*
* XXXRW: in6_ifaddrhead locking.
*/
addrloop:
TAILQ_FOREACH_SAFE(ia6, &V_in6_ifaddrhead, ia_link, nia6) {
/* check address lifetime */
if (IFA6_IS_INVALID(ia6)) {
int regen = 0;
/*
* If the expiring address is temporary, try
* regenerating a new one. This would be useful when
* we suspended a laptop PC, then turned it on after a
* period that could invalidate all temporary
* addresses. Although we may have to restart the
* loop (see below), it must be after purging the
* address. Otherwise, we'd see an infinite loop of
* regeneration.
*/
if (V_ip6_use_tempaddr &&
(ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
if (regen_tmpaddr(ia6) == 0)
regen = 1;
}
in6_purgeaddr(&ia6->ia_ifa);
if (regen)
goto addrloop; /* XXX: see below */
} else if (IFA6_IS_DEPRECATED(ia6)) {
int oldflags = ia6->ia6_flags;
ia6->ia6_flags |= IN6_IFF_DEPRECATED;
/*
* If a temporary address has just become deprecated,
* regenerate a new one if possible.
*/
if (V_ip6_use_tempaddr &&
(ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
(oldflags & IN6_IFF_DEPRECATED) == 0) {
if (regen_tmpaddr(ia6) == 0) {
/*
* A new temporary address is
* generated.
* XXX: this means the address chain
* has changed while we are still in
* the loop. Although the change
* would not cause disaster (because
* it's not a deletion, but an
* addition,) we'd rather restart the
* loop just for safety. Or does this
* significantly reduce performance??
*/
goto addrloop;
}
}
} else {
/*
* A new RA might have made a deprecated address
* preferred.
*/
ia6->ia6_flags &= ~IN6_IFF_DEPRECATED;
}
}
/* expire prefix list */
LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, npr) {
/*
* check prefix lifetime.
* since pltime is just for autoconf, pltime processing for
* prefix is not necessary.
*/
if (pr->ndpr_vltime != ND6_INFINITE_LIFETIME &&
time_uptime - pr->ndpr_lastupdate > pr->ndpr_vltime) {
/*
* address expiration and prefix expiration are
* separate. NEVER perform in6_purgeaddr here.
*/
prelist_remove(pr);
}
}
CURVNET_RESTORE();
}
/*
* ia6 - deprecated/invalidated temporary address
*/
static int
regen_tmpaddr(struct in6_ifaddr *ia6)
{
struct ifaddr *ifa;
struct ifnet *ifp;
struct in6_ifaddr *public_ifa6 = NULL;
ifp = ia6->ia_ifa.ifa_ifp;
IF_ADDR_RLOCK(ifp);
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
struct in6_ifaddr *it6;
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
it6 = (struct in6_ifaddr *)ifa;
/* ignore no autoconf addresses. */
if ((it6->ia6_flags & IN6_IFF_AUTOCONF) == 0)
continue;
/* ignore autoconf addresses with different prefixes. */
if (it6->ia6_ndpr == NULL || it6->ia6_ndpr != ia6->ia6_ndpr)
continue;
/*
* Now we are looking at an autoconf address with the same
* prefix as ours. If the address is temporary and is still
* preferred, do not create another one. It would be rare, but
* could happen, for example, when we resume a laptop PC after
* a long period.
*/
if ((it6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
!IFA6_IS_DEPRECATED(it6)) {
public_ifa6 = NULL;
break;
}
/*
* This is a public autoconf address that has the same prefix
* as ours. If it is preferred, keep it. We can't break the
* loop here, because there may be a still-preferred temporary
* address with the prefix.
*/
if (!IFA6_IS_DEPRECATED(it6))
public_ifa6 = it6;
if (public_ifa6 != NULL)
ifa_ref(&public_ifa6->ia_ifa);
}
IF_ADDR_RUNLOCK(ifp);
if (public_ifa6 != NULL) {
int e;
if ((e = in6_tmpifadd(public_ifa6, 0, 0)) != 0) {
ifa_free(&public_ifa6->ia_ifa);
log(LOG_NOTICE, "regen_tmpaddr: failed to create a new"
" tmp addr,errno=%d\n", e);
return (-1);
}
ifa_free(&public_ifa6->ia_ifa);
return (0);
}
return (-1);
}
/*
* Nuke neighbor cache/prefix/default router management table, right before
* ifp goes away.
*/
void
nd6_purge(struct ifnet *ifp)
{
struct nd_defrouter *dr, *ndr;
struct nd_prefix *pr, *npr;
/*
* Nuke default router list entries toward ifp.
* We defer removal of default router list entries that is installed
* in the routing table, in order to keep additional side effects as
* small as possible.
*/
TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
if (dr->installed)
continue;
if (dr->ifp == ifp)
defrtrlist_del(dr);
}
TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
if (!dr->installed)
continue;
if (dr->ifp == ifp)
defrtrlist_del(dr);
}
/* Nuke prefix list entries toward ifp */
LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, npr) {
if (pr->ndpr_ifp == ifp) {
/*
* Because if_detach() does *not* release prefixes
* while purging addresses the reference count will
* still be above zero. We therefore reset it to
* make sure that the prefix really gets purged.
*/
pr->ndpr_refcnt = 0;
/*
* Previously, pr->ndpr_addr is removed as well,
* but I strongly believe we don't have to do it.
* nd6_purge() is only called from in6_ifdetach(),
* which removes all the associated interface addresses
* by itself.
* (jinmei@kame.net 20010129)
*/
prelist_remove(pr);
}
}
/* cancel default outgoing interface setting */
if (V_nd6_defifindex == ifp->if_index)
nd6_setdefaultiface(0);
if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
/* Refresh default router list. */
defrouter_select();
}
/* XXXXX
* We do not nuke the neighbor cache entries here any more
* because the neighbor cache is kept in if_afdata[AF_INET6].
* nd6_purge() is invoked by in6_ifdetach() which is called
* from if_detach() where everything gets purged. So let
* in6_domifdetach() do the actual L2 table purging work.
*/
}
/*
* the caller acquires and releases the lock on the lltbls
* Returns the llentry locked
*/
struct llentry *
nd6_lookup(struct in6_addr *addr6, int flags, struct ifnet *ifp)
{
struct sockaddr_in6 sin6;
struct llentry *ln;
int llflags;
bzero(&sin6, sizeof(sin6));
sin6.sin6_len = sizeof(struct sockaddr_in6);
sin6.sin6_family = AF_INET6;
sin6.sin6_addr = *addr6;
IF_AFDATA_LOCK_ASSERT(ifp);
llflags = 0;
if (flags & ND6_CREATE)
llflags |= LLE_CREATE;
if (flags & ND6_EXCLUSIVE)
llflags |= LLE_EXCLUSIVE;
ln = lla_lookup(LLTABLE6(ifp), llflags, (struct sockaddr *)&sin6);
if ((ln != NULL) && (llflags & LLE_CREATE))
ln->ln_state = ND6_LLINFO_NOSTATE;
return (ln);
}
/*
* Test whether a given IPv6 address is a neighbor or not, ignoring
* the actual neighbor cache. The neighbor cache is ignored in order
* to not reenter the routing code from within itself.
*/
static int
nd6_is_new_addr_neighbor(struct sockaddr_in6 *addr, struct ifnet *ifp)
{
struct nd_prefix *pr;
struct ifaddr *dstaddr;
/*
* A link-local address is always a neighbor.
* XXX: a link does not necessarily specify a single interface.
*/
if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr)) {
struct sockaddr_in6 sin6_copy;
u_int32_t zone;
/*
* We need sin6_copy since sa6_recoverscope() may modify the
* content (XXX).
*/
sin6_copy = *addr;
if (sa6_recoverscope(&sin6_copy))
return (0); /* XXX: should be impossible */
if (in6_setscope(&sin6_copy.sin6_addr, ifp, &zone))
return (0);
if (sin6_copy.sin6_scope_id == zone)
return (1);
else
return (0);
}
/*
* If the address matches one of our addresses,
* it should be a neighbor.
* If the address matches one of our on-link prefixes, it should be a
* neighbor.
*/
LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
if (pr->ndpr_ifp != ifp)
continue;
if (!(pr->ndpr_stateflags & NDPRF_ONLINK)) {
struct rtentry *rt;
/* Always use the default FIB here. */
rt = in6_rtalloc1((struct sockaddr *)&pr->ndpr_prefix,
0, 0, RT_DEFAULT_FIB);
if (rt == NULL)
continue;
/*
* This is the case where multiple interfaces
* have the same prefix, but only one is installed
* into the routing table and that prefix entry
* is not the one being examined here. In the case
* where RADIX_MPATH is enabled, multiple route
* entries (of the same rt_key value) will be
* installed because the interface addresses all
* differ.
*/
if (!IN6_ARE_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr,
&((struct sockaddr_in6 *)rt_key(rt))->sin6_addr)) {
RTFREE_LOCKED(rt);
continue;
}
RTFREE_LOCKED(rt);
}
if (IN6_ARE_MASKED_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr,
&addr->sin6_addr, &pr->ndpr_mask))
return (1);
}
/*
* If the address is assigned on the node of the other side of
* a p2p interface, the address should be a neighbor.
*/
dstaddr = ifa_ifwithdstaddr((struct sockaddr *)addr, RT_ALL_FIBS);
if (dstaddr != NULL) {
if (dstaddr->ifa_ifp == ifp) {
ifa_free(dstaddr);
return (1);
}
ifa_free(dstaddr);
}
/*
* If the default router list is empty, all addresses are regarded
* as on-link, and thus, as a neighbor.
*/
if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV &&
TAILQ_EMPTY(&V_nd_defrouter) &&
V_nd6_defifindex == ifp->if_index) {
return (1);
}
return (0);
}
/*
* Detect if a given IPv6 address identifies a neighbor on a given link.
* XXX: should take care of the destination of a p2p link?
*/
int
nd6_is_addr_neighbor(struct sockaddr_in6 *addr, struct ifnet *ifp)
{
struct llentry *lle;
int rc = 0;
IF_AFDATA_UNLOCK_ASSERT(ifp);
if (nd6_is_new_addr_neighbor(addr, ifp))
return (1);
/*
* Even if the address matches none of our addresses, it might be
* in the neighbor cache.
*/
IF_AFDATA_RLOCK(ifp);
if ((lle = nd6_lookup(&addr->sin6_addr, 0, ifp)) != NULL) {
LLE_RUNLOCK(lle);
rc = 1;
}
IF_AFDATA_RUNLOCK(ifp);
return (rc);
}
/*
* Free an nd6 llinfo entry.
* Since the function would cause significant changes in the kernel, DO NOT
* make it global, unless you have a strong reason for the change, and are sure
* that the change is safe.
*/
static struct llentry *
nd6_free(struct llentry *ln, int gc)
{
struct llentry *next;
struct nd_defrouter *dr;
struct ifnet *ifp;
LLE_WLOCK_ASSERT(ln);
/*
* we used to have pfctlinput(PRC_HOSTDEAD) here.
* even though it is not harmful, it was not really necessary.
*/
/* cancel timer */
nd6_llinfo_settimer_locked(ln, -1);
ifp = ln->lle_tbl->llt_ifp;
if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
dr = defrouter_lookup(&L3_ADDR_SIN6(ln)->sin6_addr, ifp);
if (dr != NULL && dr->expire &&
ln->ln_state == ND6_LLINFO_STALE && gc) {
/*
* If the reason for the deletion is just garbage
* collection, and the neighbor is an active default
* router, do not delete it. Instead, reset the GC
* timer using the router's lifetime.
* Simply deleting the entry would affect default
* router selection, which is not necessarily a good
* thing, especially when we're using router preference
* values.
* XXX: the check for ln_state would be redundant,
* but we intentionally keep it just in case.
*/
if (dr->expire > time_uptime)
nd6_llinfo_settimer_locked(ln,
(dr->expire - time_uptime) * hz);
else
nd6_llinfo_settimer_locked(ln,
(long)V_nd6_gctimer * hz);
next = LIST_NEXT(ln, lle_next);
LLE_REMREF(ln);
LLE_WUNLOCK(ln);
return (next);
}
if (dr) {
/*
* Unreachablity of a router might affect the default
* router selection and on-link detection of advertised
* prefixes.
*/
/*
* Temporarily fake the state to choose a new default
* router and to perform on-link determination of
* prefixes correctly.
* Below the state will be set correctly,
* or the entry itself will be deleted.
*/
ln->ln_state = ND6_LLINFO_INCOMPLETE;
}
if (ln->ln_router || dr) {
/*
* We need to unlock to avoid a LOR with rt6_flush() with the
* rnh and for the calls to pfxlist_onlink_check() and
* defrouter_select() in the block further down for calls
* into nd6_lookup(). We still hold a ref.
*/
LLE_WUNLOCK(ln);
/*
* rt6_flush must be called whether or not the neighbor
* is in the Default Router List.
* See a corresponding comment in nd6_na_input().
*/
rt6_flush(&L3_ADDR_SIN6(ln)->sin6_addr, ifp);
}
if (dr) {
/*
* Since defrouter_select() does not affect the
* on-link determination and MIP6 needs the check
* before the default router selection, we perform
* the check now.
*/
pfxlist_onlink_check();
/*
* Refresh default router list.
*/
defrouter_select();
}
if (ln->ln_router || dr)
LLE_WLOCK(ln);
}
/*
* Before deleting the entry, remember the next entry as the
* return value. We need this because pfxlist_onlink_check() above
* might have freed other entries (particularly the old next entry) as
* a side effect (XXX).
*/
next = LIST_NEXT(ln, lle_next);
/*
* Save to unlock. We still hold an extra reference and will not
* free(9) in llentry_free() if someone else holds one as well.
*/
LLE_WUNLOCK(ln);
IF_AFDATA_LOCK(ifp);
LLE_WLOCK(ln);
/* Guard against race with other llentry_free(). */
if (ln->la_flags & LLE_LINKED) {
LLE_REMREF(ln);
llentry_free(ln);
} else
LLE_FREE_LOCKED(ln);
IF_AFDATA_UNLOCK(ifp);
return (next);
}
/*
* Upper-layer reachability hint for Neighbor Unreachability Detection.
*
* XXX cost-effective methods?
*/
void
nd6_nud_hint(struct rtentry *rt, struct in6_addr *dst6, int force)
{
struct llentry *ln;
struct ifnet *ifp;
if ((dst6 == NULL) || (rt == NULL))
return;
ifp = rt->rt_ifp;
IF_AFDATA_RLOCK(ifp);
ln = nd6_lookup(dst6, ND6_EXCLUSIVE, NULL);
IF_AFDATA_RUNLOCK(ifp);
if (ln == NULL)
return;
if (ln->ln_state < ND6_LLINFO_REACHABLE)
goto done;
/*
* if we get upper-layer reachability confirmation many times,
* it is possible we have false information.
*/
if (!force) {
ln->ln_byhint++;
if (ln->ln_byhint > V_nd6_maxnudhint) {
goto done;
}
}
ln->ln_state = ND6_LLINFO_REACHABLE;
if (!ND6_LLINFO_PERMANENT(ln)) {
nd6_llinfo_settimer_locked(ln,
(long)ND_IFINFO(rt->rt_ifp)->reachable * hz);
}
done:
LLE_WUNLOCK(ln);
}
/*
* Rejuvenate this function for routing operations related
* processing.
*/
void
nd6_rtrequest(int req, struct rtentry *rt, struct rt_addrinfo *info)
{
struct sockaddr_in6 *gateway;
struct nd_defrouter *dr;
struct ifnet *ifp;
gateway = (struct sockaddr_in6 *)rt->rt_gateway;
ifp = rt->rt_ifp;
switch (req) {
case RTM_ADD:
break;
case RTM_DELETE:
if (!ifp)
return;
/*
* Only indirect routes are interesting.
*/
if ((rt->rt_flags & RTF_GATEWAY) == 0)
return;
/*
* check for default route
*/
if (IN6_ARE_ADDR_EQUAL(&in6addr_any,
&SIN6(rt_key(rt))->sin6_addr)) {
dr = defrouter_lookup(&gateway->sin6_addr, ifp);
if (dr != NULL)
dr->installed = 0;
}
break;
}
}
int
nd6_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp)
{
struct in6_drlist *drl = (struct in6_drlist *)data;
struct in6_oprlist *oprl = (struct in6_oprlist *)data;
struct in6_ndireq *ndi = (struct in6_ndireq *)data;
struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data;
struct in6_ndifreq *ndif = (struct in6_ndifreq *)data;
struct nd_defrouter *dr;
struct nd_prefix *pr;
int i = 0, error = 0;
if (ifp->if_afdata[AF_INET6] == NULL)
return (EPFNOSUPPORT);
switch (cmd) {
case SIOCGDRLST_IN6:
/*
* obsolete API, use sysctl under net.inet6.icmp6
*/
bzero(drl, sizeof(*drl));
TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
if (i >= DRLSTSIZ)
break;
drl->defrouter[i].rtaddr = dr->rtaddr;
in6_clearscope(&drl->defrouter[i].rtaddr);
drl->defrouter[i].flags = dr->flags;
drl->defrouter[i].rtlifetime = dr->rtlifetime;
drl->defrouter[i].expire = dr->expire +
(time_second - time_uptime);
drl->defrouter[i].if_index = dr->ifp->if_index;
i++;
}
break;
case SIOCGPRLST_IN6:
/*
* obsolete API, use sysctl under net.inet6.icmp6
*
* XXX the structure in6_prlist was changed in backward-
* incompatible manner. in6_oprlist is used for SIOCGPRLST_IN6,
* in6_prlist is used for nd6_sysctl() - fill_prlist().
*/
/*
* XXX meaning of fields, especialy "raflags", is very
* differnet between RA prefix list and RR/static prefix list.
* how about separating ioctls into two?
*/
bzero(oprl, sizeof(*oprl));
LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
struct nd_pfxrouter *pfr;
int j;
if (i >= PRLSTSIZ)
break;
oprl->prefix[i].prefix = pr->ndpr_prefix.sin6_addr;
oprl->prefix[i].raflags = pr->ndpr_raf;
oprl->prefix[i].prefixlen = pr->ndpr_plen;
oprl->prefix[i].vltime = pr->ndpr_vltime;
oprl->prefix[i].pltime = pr->ndpr_pltime;
oprl->prefix[i].if_index = pr->ndpr_ifp->if_index;
if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME)
oprl->prefix[i].expire = 0;
else {
time_t maxexpire;
/* XXX: we assume time_t is signed. */
maxexpire = (-1) &
~((time_t)1 <<
((sizeof(maxexpire) * 8) - 1));
if (pr->ndpr_vltime <
maxexpire - pr->ndpr_lastupdate) {
oprl->prefix[i].expire =
pr->ndpr_lastupdate +
pr->ndpr_vltime +
(time_second - time_uptime);
} else
oprl->prefix[i].expire = maxexpire;
}
j = 0;
LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) {
if (j < DRLSTSIZ) {
#define RTRADDR oprl->prefix[i].advrtr[j]
RTRADDR = pfr->router->rtaddr;
in6_clearscope(&RTRADDR);
#undef RTRADDR
}
j++;
}
oprl->prefix[i].advrtrs = j;
oprl->prefix[i].origin = PR_ORIG_RA;
i++;
}
break;
case OSIOCGIFINFO_IN6:
#define ND ndi->ndi
/* XXX: old ndp(8) assumes a positive value for linkmtu. */
bzero(&ND, sizeof(ND));
ND.linkmtu = IN6_LINKMTU(ifp);
ND.maxmtu = ND_IFINFO(ifp)->maxmtu;
ND.basereachable = ND_IFINFO(ifp)->basereachable;
ND.reachable = ND_IFINFO(ifp)->reachable;
ND.retrans = ND_IFINFO(ifp)->retrans;
ND.flags = ND_IFINFO(ifp)->flags;
ND.recalctm = ND_IFINFO(ifp)->recalctm;
ND.chlim = ND_IFINFO(ifp)->chlim;
break;
case SIOCGIFINFO_IN6:
ND = *ND_IFINFO(ifp);
break;
case SIOCSIFINFO_IN6:
/*
* used to change host variables from userland.
* intented for a use on router to reflect RA configurations.
*/
/* 0 means 'unspecified' */
if (ND.linkmtu != 0) {
if (ND.linkmtu < IPV6_MMTU ||
ND.linkmtu > IN6_LINKMTU(ifp)) {
error = EINVAL;
break;
}
ND_IFINFO(ifp)->linkmtu = ND.linkmtu;
}
if (ND.basereachable != 0) {
int obasereachable = ND_IFINFO(ifp)->basereachable;
ND_IFINFO(ifp)->basereachable = ND.basereachable;
if (ND.basereachable != obasereachable)
ND_IFINFO(ifp)->reachable =
ND_COMPUTE_RTIME(ND.basereachable);
}
if (ND.retrans != 0)
ND_IFINFO(ifp)->retrans = ND.retrans;
if (ND.chlim != 0)
ND_IFINFO(ifp)->chlim = ND.chlim;
/* FALLTHROUGH */
case SIOCSIFINFO_FLAGS:
{
struct ifaddr *ifa;
struct in6_ifaddr *ia;
if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
!(ND.flags & ND6_IFF_IFDISABLED)) {
/* ifdisabled 1->0 transision */
/*
* If the interface is marked as ND6_IFF_IFDISABLED and
* has an link-local address with IN6_IFF_DUPLICATED,
* do not clear ND6_IFF_IFDISABLED.
* See RFC 4862, Section 5.4.5.
*/
int duplicated_linklocal = 0;
IF_ADDR_RLOCK(ifp);
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
ia = (struct in6_ifaddr *)ifa;
if ((ia->ia6_flags & IN6_IFF_DUPLICATED) &&
IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia))) {
duplicated_linklocal = 1;
break;
}
}
IF_ADDR_RUNLOCK(ifp);
if (duplicated_linklocal) {
ND.flags |= ND6_IFF_IFDISABLED;
log(LOG_ERR, "Cannot enable an interface"
" with a link-local address marked"
" duplicate.\n");
} else {
ND_IFINFO(ifp)->flags &= ~ND6_IFF_IFDISABLED;
if (ifp->if_flags & IFF_UP)
in6_if_up(ifp);
}
} else if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
(ND.flags & ND6_IFF_IFDISABLED)) {
/* ifdisabled 0->1 transision */
/* Mark all IPv6 address as tentative. */
ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
IF_ADDR_RLOCK(ifp);
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
ia = (struct in6_ifaddr *)ifa;
ia->ia6_flags |= IN6_IFF_TENTATIVE;
}
IF_ADDR_RUNLOCK(ifp);
}
if (ND.flags & ND6_IFF_AUTO_LINKLOCAL) {
if (!(ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL)) {
/* auto_linklocal 0->1 transision */
/* If no link-local address on ifp, configure */
ND_IFINFO(ifp)->flags |= ND6_IFF_AUTO_LINKLOCAL;
in6_ifattach(ifp, NULL);
} else if (!(ND.flags & ND6_IFF_IFDISABLED) &&
ifp->if_flags & IFF_UP) {
/*
* When the IF already has
* ND6_IFF_AUTO_LINKLOCAL, no link-local
* address is assigned, and IFF_UP, try to
* assign one.
*/
int haslinklocal = 0;
IF_ADDR_RLOCK(ifp);
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
ia = (struct in6_ifaddr *)ifa;
if (IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia))) {
haslinklocal = 1;
break;
}
}
IF_ADDR_RUNLOCK(ifp);
if (!haslinklocal)
in6_ifattach(ifp, NULL);
}
}
}
ND_IFINFO(ifp)->flags = ND.flags;
break;
#undef ND
case SIOCSNDFLUSH_IN6: /* XXX: the ioctl name is confusing... */
/* sync kernel routing table with the default router list */
defrouter_reset();
defrouter_select();
break;
case SIOCSPFXFLUSH_IN6:
{
/* flush all the prefix advertised by routers */
struct nd_prefix *pr, *next;
LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, next) {
struct in6_ifaddr *ia, *ia_next;
if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
continue; /* XXX */
/* do we really have to remove addresses as well? */
/* XXXRW: in6_ifaddrhead locking. */
TAILQ_FOREACH_SAFE(ia, &V_in6_ifaddrhead, ia_link,
ia_next) {
if ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0)
continue;
if (ia->ia6_ndpr == pr)
in6_purgeaddr(&ia->ia_ifa);
}
prelist_remove(pr);
}
break;
}
case SIOCSRTRFLUSH_IN6:
{
/* flush all the default routers */
struct nd_defrouter *dr, *next;
defrouter_reset();
TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, next) {
defrtrlist_del(dr);
}
defrouter_select();
break;
}
case SIOCGNBRINFO_IN6:
{
struct llentry *ln;
struct in6_addr nb_addr = nbi->addr; /* make local for safety */
if ((error = in6_setscope(&nb_addr, ifp, NULL)) != 0)
return (error);
IF_AFDATA_RLOCK(ifp);
ln = nd6_lookup(&nb_addr, 0, ifp);
IF_AFDATA_RUNLOCK(ifp);
if (ln == NULL) {
error = EINVAL;
break;
}
nbi->state = ln->ln_state;
nbi->asked = ln->la_asked;
nbi->isrouter = ln->ln_router;
if (ln->la_expire == 0)
nbi->expire = 0;
else
nbi->expire = ln->la_expire +
(time_second - time_uptime);
LLE_RUNLOCK(ln);
break;
}
case SIOCGDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
ndif->ifindex = V_nd6_defifindex;
break;
case SIOCSDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
return (nd6_setdefaultiface(ndif->ifindex));
}
return (error);
}
/*
* Create neighbor cache entry and cache link-layer address,
* on reception of inbound ND6 packets. (RS/RA/NS/redirect)
*
* type - ICMP6 type
* code - type dependent information
*
* XXXXX
* The caller of this function already acquired the ndp
* cache table lock because the cache entry is returned.
*/
struct llentry *
nd6_cache_lladdr(struct ifnet *ifp, struct in6_addr *from, char *lladdr,
int lladdrlen, int type, int code)
{
struct llentry *ln = NULL;
int is_newentry;
int do_update;
int olladdr;
int llchange;
int flags;
int newstate = 0;
uint16_t router = 0;
struct sockaddr_in6 sin6;
struct mbuf *chain = NULL;
int static_route = 0;
IF_AFDATA_UNLOCK_ASSERT(ifp);
KASSERT(ifp != NULL, ("%s: ifp == NULL", __func__));
KASSERT(from != NULL, ("%s: from == NULL", __func__));
/* nothing must be updated for unspecified address */
if (IN6_IS_ADDR_UNSPECIFIED(from))
return NULL;
/*
* Validation about ifp->if_addrlen and lladdrlen must be done in
* the caller.
*
* XXX If the link does not have link-layer adderss, what should
* we do? (ifp->if_addrlen == 0)
* Spec says nothing in sections for RA, RS and NA. There's small
* description on it in NS section (RFC 2461 7.2.3).
*/
flags = lladdr ? ND6_EXCLUSIVE : 0;
IF_AFDATA_RLOCK(ifp);
ln = nd6_lookup(from, flags, ifp);
IF_AFDATA_RUNLOCK(ifp);
if (ln == NULL) {
flags |= ND6_EXCLUSIVE;
IF_AFDATA_LOCK(ifp);
ln = nd6_lookup(from, flags | ND6_CREATE, ifp);
IF_AFDATA_UNLOCK(ifp);
is_newentry = 1;
} else {
/* do nothing if static ndp is set */
if (ln->la_flags & LLE_STATIC) {
static_route = 1;
goto done;
}
is_newentry = 0;
}
if (ln == NULL)
return (NULL);
olladdr = (ln->la_flags & LLE_VALID) ? 1 : 0;
if (olladdr && lladdr) {
llchange = bcmp(lladdr, &ln->ll_addr,
ifp->if_addrlen);
} else
llchange = 0;
/*
* newentry olladdr lladdr llchange (*=record)
* 0 n n -- (1)
* 0 y n -- (2)
* 0 n y -- (3) * STALE
* 0 y y n (4) *
* 0 y y y (5) * STALE
* 1 -- n -- (6) NOSTATE(= PASSIVE)
* 1 -- y -- (7) * STALE
*/
if (lladdr) { /* (3-5) and (7) */
/*
* Record source link-layer address
* XXX is it dependent to ifp->if_type?
*/
bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen);
ln->la_flags |= LLE_VALID;
EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
}
if (!is_newentry) {
if ((!olladdr && lladdr != NULL) || /* (3) */
(olladdr && lladdr != NULL && llchange)) { /* (5) */
do_update = 1;
newstate = ND6_LLINFO_STALE;
} else /* (1-2,4) */
do_update = 0;
} else {
do_update = 1;
if (lladdr == NULL) /* (6) */
newstate = ND6_LLINFO_NOSTATE;
else /* (7) */
newstate = ND6_LLINFO_STALE;
}
if (do_update) {
/*
* Update the state of the neighbor cache.
*/
ln->ln_state = newstate;
if (ln->ln_state == ND6_LLINFO_STALE) {
/*
* XXX: since nd6_output() below will cause
* state tansition to DELAY and reset the timer,
* we must set the timer now, although it is actually
* meaningless.
*/
nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
if (ln->la_hold) {
struct mbuf *m_hold, *m_hold_next;
/*
* reset the la_hold in advance, to explicitly
* prevent a la_hold lookup in nd6_output()
* (wouldn't happen, though...)
*/
for (m_hold = ln->la_hold, ln->la_hold = NULL;
m_hold; m_hold = m_hold_next) {
m_hold_next = m_hold->m_nextpkt;
m_hold->m_nextpkt = NULL;
/*
* we assume ifp is not a p2p here, so
* just set the 2nd argument as the
* 1st one.
*/
nd6_output_lle(ifp, ifp, m_hold, L3_ADDR_SIN6(ln), NULL, ln, &chain);
}
/*
* If we have mbufs in the chain we need to do
* deferred transmit. Copy the address from the
* llentry before dropping the lock down below.
*/
if (chain != NULL)
memcpy(&sin6, L3_ADDR_SIN6(ln), sizeof(sin6));
}
} else if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
/* probe right away */
nd6_llinfo_settimer_locked((void *)ln, 0);
}
}
/*
* ICMP6 type dependent behavior.
*
* NS: clear IsRouter if new entry
* RS: clear IsRouter
* RA: set IsRouter if there's lladdr
* redir: clear IsRouter if new entry
*
* RA case, (1):
* The spec says that we must set IsRouter in the following cases:
* - If lladdr exist, set IsRouter. This means (1-5).
* - If it is old entry (!newentry), set IsRouter. This means (7).
* So, based on the spec, in (1-5) and (7) cases we must set IsRouter.
* A quetion arises for (1) case. (1) case has no lladdr in the
* neighbor cache, this is similar to (6).
* This case is rare but we figured that we MUST NOT set IsRouter.
*
* newentry olladdr lladdr llchange NS RS RA redir
* D R
* 0 n n -- (1) c ? s
* 0 y n -- (2) c s s
* 0 n y -- (3) c s s
* 0 y y n (4) c s s
* 0 y y y (5) c s s
* 1 -- n -- (6) c c c s
* 1 -- y -- (7) c c s c s
*
* (c=clear s=set)
*/
switch (type & 0xff) {
case ND_NEIGHBOR_SOLICIT:
/*
* New entry must have is_router flag cleared.
*/
if (is_newentry) /* (6-7) */
ln->ln_router = 0;
break;
case ND_REDIRECT:
/*
* If the icmp is a redirect to a better router, always set the
* is_router flag. Otherwise, if the entry is newly created,
* clear the flag. [RFC 2461, sec 8.3]
*/
if (code == ND_REDIRECT_ROUTER)
ln->ln_router = 1;
else if (is_newentry) /* (6-7) */
ln->ln_router = 0;
break;
case ND_ROUTER_SOLICIT:
/*
* is_router flag must always be cleared.
*/
ln->ln_router = 0;
break;
case ND_ROUTER_ADVERT:
/*
* Mark an entry with lladdr as a router.
*/
if ((!is_newentry && (olladdr || lladdr)) || /* (2-5) */
(is_newentry && lladdr)) { /* (7) */
ln->ln_router = 1;
}
break;
}
if (ln != NULL) {
static_route = (ln->la_flags & LLE_STATIC);
router = ln->ln_router;
if (flags & ND6_EXCLUSIVE)
LLE_WUNLOCK(ln);
else
LLE_RUNLOCK(ln);
if (static_route)
ln = NULL;
}
if (chain)
nd6_output_flush(ifp, ifp, chain, &sin6, NULL);
/*
* When the link-layer address of a router changes, select the
* best router again. In particular, when the neighbor entry is newly
* created, it might affect the selection policy.
* Question: can we restrict the first condition to the "is_newentry"
* case?
* XXX: when we hear an RA from a new router with the link-layer
* address option, defrouter_select() is called twice, since
* defrtrlist_update called the function as well. However, I believe
* we can compromise the overhead, since it only happens the first
* time.
* XXX: although defrouter_select() should not have a bad effect
* for those are not autoconfigured hosts, we explicitly avoid such
* cases for safety.
*/
if (do_update && router &&
ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
/*
* guaranteed recursion
*/
defrouter_select();
}
return (ln);
done:
if (ln != NULL) {
if (flags & ND6_EXCLUSIVE)
LLE_WUNLOCK(ln);
else
LLE_RUNLOCK(ln);
if (static_route)
ln = NULL;
}
return (ln);
}
static void
nd6_slowtimo(void *arg)
{
CURVNET_SET((struct vnet *) arg);
struct nd_ifinfo *nd6if;
struct ifnet *ifp;
callout_reset(&V_nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,
nd6_slowtimo, curvnet);
IFNET_RLOCK_NOSLEEP();
TAILQ_FOREACH(ifp, &V_ifnet, if_list) {
if (ifp->if_afdata[AF_INET6] == NULL)
continue;
nd6if = ND_IFINFO(ifp);
if (nd6if->basereachable && /* already initialized */
(nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) {
/*
* Since reachable time rarely changes by router
* advertisements, we SHOULD insure that a new random
* value gets recomputed at least once every few hours.
* (RFC 2461, 6.3.4)
*/
nd6if->recalctm = V_nd6_recalc_reachtm_interval;
nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable);
}
}
IFNET_RUNLOCK_NOSLEEP();
CURVNET_RESTORE();
}
/*
* IPv6 packet output - light version.
* Checks if destination LLE exists and is in proper state
* (e.g no modification required). If not true, fall back to
* "heavy" version.
*/
int
nd6_output(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m,
struct sockaddr_in6 *dst, struct rtentry *rt0)
{
struct llentry *ln = NULL;
int error = 0;
/* discard the packet if IPv6 operation is disabled on the interface */
if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)) {
m_freem(m);
return (ENETDOWN); /* better error? */
}
if (IN6_IS_ADDR_MULTICAST(&dst->sin6_addr))
goto sendpkt;
if (nd6_need_cache(ifp) == 0)
goto sendpkt;
IF_AFDATA_RLOCK(ifp);
ln = nd6_lookup(&dst->sin6_addr, 0, ifp);
IF_AFDATA_RUNLOCK(ifp);
/*
* Perform fast path for the following cases:
* 1) lle state is REACHABLE
* 2) lle state is DELAY (NS message sentNS message sent)
*
* Every other case involves lle modification, so we handle
* them separately.
*/
if (ln == NULL || (ln->ln_state != ND6_LLINFO_REACHABLE &&
ln->ln_state != ND6_LLINFO_DELAY)) {
/* Fall back to slow processing path */
if (ln != NULL)
LLE_RUNLOCK(ln);
return (nd6_output_lle(ifp, origifp, m, dst, rt0, NULL, NULL));
}
sendpkt:
if (ln != NULL)
LLE_RUNLOCK(ln);
#ifdef MAC
mac_netinet6_nd6_send(ifp, m);
#endif
/*
* If called from nd6_ns_output() (NS), nd6_na_output() (NA),
* icmp6_redirect_output() (REDIRECT) or from rip6_output() (RS, RA
* as handled by rtsol and rtadvd), mbufs will be tagged for SeND
* to be diverted to user space. When re-injected into the kernel,
* send_output() will directly dispatch them to the outgoing interface.
*/
if (send_sendso_input_hook != NULL) {
struct m_tag *mtag;
struct ip6_hdr *ip6;
int ip6len;
mtag = m_tag_find(m, PACKET_TAG_ND_OUTGOING, NULL);
if (mtag != NULL) {
ip6 = mtod(m, struct ip6_hdr *);
ip6len = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen);
/* Use the SEND socket */
error = send_sendso_input_hook(m, ifp, SND_OUT,
ip6len);
/* -1 == no app on SEND socket */
if (error == 0 || error != -1)
return (error);
}
}
m_clrprotoflags(m); /* Avoid confusing lower layers. */
IP_PROBE(send, NULL, NULL, mtod(m, struct ip6_hdr *), ifp, NULL,
mtod(m, struct ip6_hdr *));
if ((ifp->if_flags & IFF_LOOPBACK) == 0)
origifp = ifp;
error = (*ifp->if_output)(origifp, m, (struct sockaddr *)dst, NULL);
return (error);
}
/*
* Output IPv6 packet - heavy version.
* Function assume that either
* 1) destination LLE does not exist, is invalid or stale, so
* ND6_EXCLUSIVE lock needs to be acquired
* 2) destination lle is provided (with ND6_EXCLUSIVE lock),
* in that case packets are queued in &chain.
*
*/
int
nd6_output_lle(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m,
struct sockaddr_in6 *dst, struct rtentry *rt0, struct llentry *lle,
struct mbuf **chain)
{
struct m_tag *mtag;
struct ip6_hdr *ip6;
int error = 0;
int flags = 0;
int has_lle = 0;
int ip6len;
#ifdef INVARIANTS
if (lle != NULL) {
LLE_WLOCK_ASSERT(lle);
KASSERT(chain != NULL, (" lle locked but no mbuf chain pointer passed"));
}
#endif
KASSERT(m != NULL, ("NULL mbuf, nothing to send"));
/* discard the packet if IPv6 operation is disabled on the interface */
if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)) {
m_freem(m);
return (ENETDOWN); /* better error? */
}
if (lle != NULL)
has_lle = 1;
if (IN6_IS_ADDR_MULTICAST(&dst->sin6_addr))
goto sendpkt;
if (nd6_need_cache(ifp) == 0)
goto sendpkt;
/*
* Address resolution or Neighbor Unreachability Detection
* for the next hop.
* At this point, the destination of the packet must be a unicast
* or an anycast address(i.e. not a multicast).
*/
if (lle == NULL) {
IF_AFDATA_RLOCK(ifp);
lle = nd6_lookup(&dst->sin6_addr, ND6_EXCLUSIVE, ifp);
IF_AFDATA_RUNLOCK(ifp);
if ((lle == NULL) && nd6_is_addr_neighbor(dst, ifp)) {
/*
* Since nd6_is_addr_neighbor() internally calls nd6_lookup(),
* the condition below is not very efficient. But we believe
* it is tolerable, because this should be a rare case.
*/
flags = ND6_CREATE | ND6_EXCLUSIVE;
IF_AFDATA_LOCK(ifp);
lle = nd6_lookup(&dst->sin6_addr, flags, ifp);
IF_AFDATA_UNLOCK(ifp);
}
}
if (lle == NULL) {
if ((ifp->if_flags & IFF_POINTOPOINT) == 0 &&
!(ND_IFINFO(ifp)->flags & ND6_IFF_PERFORMNUD)) {
char ip6buf[INET6_ADDRSTRLEN];
log(LOG_DEBUG,
"nd6_output: can't allocate llinfo for %s "
"(ln=%p)\n",
ip6_sprintf(ip6buf, &dst->sin6_addr), lle);
m_freem(m);
return (ENOBUFS);
}
goto sendpkt; /* send anyway */
}
LLE_WLOCK_ASSERT(lle);
/* We don't have to do link-layer address resolution on a p2p link. */
if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
lle->ln_state < ND6_LLINFO_REACHABLE) {
lle->ln_state = ND6_LLINFO_STALE;
nd6_llinfo_settimer_locked(lle, (long)V_nd6_gctimer * hz);
}
/*
* The first time we send a packet to a neighbor whose entry is
* STALE, we have to change the state to DELAY and a sets a timer to
* expire in DELAY_FIRST_PROBE_TIME seconds to ensure do
* neighbor unreachability detection on expiration.
* (RFC 2461 7.3.3)
*/
if (lle->ln_state == ND6_LLINFO_STALE) {
lle->la_asked = 0;
lle->ln_state = ND6_LLINFO_DELAY;
nd6_llinfo_settimer_locked(lle, (long)V_nd6_delay * hz);
}
/*
* If the neighbor cache entry has a state other than INCOMPLETE
* (i.e. its link-layer address is already resolved), just
* send the packet.
*/
if (lle->ln_state > ND6_LLINFO_INCOMPLETE)
goto sendpkt;
/*
* There is a neighbor cache entry, but no ethernet address
* response yet. Append this latest packet to the end of the
* packet queue in the mbuf, unless the number of the packet
* does not exceed nd6_maxqueuelen. When it exceeds nd6_maxqueuelen,
* the oldest packet in the queue will be removed.
*/
if (lle->ln_state == ND6_LLINFO_NOSTATE)
lle->ln_state = ND6_LLINFO_INCOMPLETE;
if (lle->la_hold != NULL) {
struct mbuf *m_hold;
int i;
i = 0;
for (m_hold = lle->la_hold; m_hold; m_hold = m_hold->m_nextpkt){
i++;
if (m_hold->m_nextpkt == NULL) {
m_hold->m_nextpkt = m;
break;
}
}
while (i >= V_nd6_maxqueuelen) {
m_hold = lle->la_hold;
lle->la_hold = lle->la_hold->m_nextpkt;
m_freem(m_hold);
i--;
}
} else {
lle->la_hold = m;
}
/*
* If there has been no NS for the neighbor after entering the
* INCOMPLETE state, send the first solicitation.
*/
if (!ND6_LLINFO_PERMANENT(lle) && lle->la_asked == 0) {
lle->la_asked++;
nd6_llinfo_settimer_locked(lle,
(long)ND_IFINFO(ifp)->retrans * hz / 1000);
LLE_WUNLOCK(lle);
nd6_ns_output(ifp, NULL, &dst->sin6_addr, lle, 0);
if (has_lle != 0)
LLE_WLOCK(lle);
} else if (has_lle == 0) {
/*
* We did the lookup (no lle arg) so we
* need to do the unlock here.
*/
LLE_WUNLOCK(lle);
}
return (0);
sendpkt:
/*
* ln is valid and the caller did not pass in
* an llentry
*/
if (lle != NULL && has_lle == 0)
LLE_WUNLOCK(lle);
#ifdef MAC
mac_netinet6_nd6_send(ifp, m);
#endif
/*
* If called from nd6_ns_output() (NS), nd6_na_output() (NA),
* icmp6_redirect_output() (REDIRECT) or from rip6_output() (RS, RA
* as handled by rtsol and rtadvd), mbufs will be tagged for SeND
* to be diverted to user space. When re-injected into the kernel,
* send_output() will directly dispatch them to the outgoing interface.
*/
if (send_sendso_input_hook != NULL) {
mtag = m_tag_find(m, PACKET_TAG_ND_OUTGOING, NULL);
if (mtag != NULL) {
ip6 = mtod(m, struct ip6_hdr *);
ip6len = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen);
/* Use the SEND socket */
error = send_sendso_input_hook(m, ifp, SND_OUT,
ip6len);
/* -1 == no app on SEND socket */
if (error == 0 || error != -1)
return (error);
}
}
/*
* We were passed in a pointer to an lle with the lock held
* this means that we can't call if_output as we will
* recurse on the lle lock - so what we do is we create
* a list of mbufs to send and transmit them in the caller
* after the lock is dropped
*/
if (has_lle != 0) {
if (*chain == NULL)
*chain = m;
else {
struct mbuf *mb;
/*
* append mbuf to end of deferred chain
*/
mb = *chain;
while (mb->m_nextpkt != NULL)
mb = mb->m_nextpkt;
mb->m_nextpkt = m;
}
return (error);
}
m_clrprotoflags(m); /* Avoid confusing lower layers. */
IP_PROBE(send, NULL, NULL, mtod(m, struct ip6_hdr *), ifp, NULL,
mtod(m, struct ip6_hdr *));
if ((ifp->if_flags & IFF_LOOPBACK) == 0)
origifp = ifp;
error = (*ifp->if_output)(origifp, m, (struct sockaddr *)dst, NULL);
return (error);
}
int
nd6_output_flush(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *chain,
struct sockaddr_in6 *dst, struct route *ro)
{
struct mbuf *m, *m_head;
struct ifnet *outifp;
int error = 0;
m_head = chain;
if ((ifp->if_flags & IFF_LOOPBACK) != 0)
outifp = origifp;
else
outifp = ifp;
while (m_head) {
m = m_head;
m_head = m_head->m_nextpkt;
error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, ro);
}
/*
* XXX
* note that intermediate errors are blindly ignored - but this is
* the same convention as used with nd6_output when called by
* nd6_cache_lladdr
*/
return (error);
}
int
nd6_need_cache(struct ifnet *ifp)
{
/*
* XXX: we currently do not make neighbor cache on any interface
* other than ARCnet, Ethernet, FDDI and GIF.
*
* RFC2893 says:
* - unidirectional tunnels needs no ND
*/
switch (ifp->if_type) {
case IFT_ARCNET:
case IFT_ETHER:
case IFT_FDDI:
case IFT_IEEE1394:
#ifdef IFT_L2VLAN
case IFT_L2VLAN:
#endif
#ifdef IFT_IEEE80211
case IFT_IEEE80211:
#endif
case IFT_INFINIBAND:
case IFT_GIF: /* XXX need more cases? */
case IFT_PPP:
case IFT_TUNNEL:
case IFT_BRIDGE:
case IFT_PROPVIRTUAL:
return (1);
default:
return (0);
}
}
/*
* Add pernament ND6 link-layer record for given
* interface address.
*
* Very similar to IPv4 arp_ifinit(), but:
* 1) IPv6 DAD is performed in different place
* 2) It is called by IPv6 protocol stack in contrast to
* arp_ifinit() which is typically called in SIOCSIFADDR
* driver ioctl handler.
*
*/
int
nd6_add_ifa_lle(struct in6_ifaddr *ia)
{
struct ifnet *ifp;
struct llentry *ln;
ifp = ia->ia_ifa.ifa_ifp;
IF_AFDATA_LOCK(ifp);
ia->ia_ifa.ifa_rtrequest = nd6_rtrequest;
ln = lla_lookup(LLTABLE6(ifp), (LLE_CREATE | LLE_IFADDR |
LLE_EXCLUSIVE), (struct sockaddr *)&ia->ia_addr);
IF_AFDATA_UNLOCK(ifp);
if (ln != NULL) {
ln->la_expire = 0; /* for IPv6 this means permanent */
ln->ln_state = ND6_LLINFO_REACHABLE;
LLE_WUNLOCK(ln);
in6_newaddrmsg(ia, RTM_ADD);
return (0);
}
return (ENOBUFS);
}
/*
* Removes ALL lle records for interface address prefix.
* XXXME: That's probably not we really want to do, we need
* to remove address record only and keep other records
* until we determine if given prefix is really going
* to be removed.
*/
void
nd6_rem_ifa_lle(struct in6_ifaddr *ia)
{
struct sockaddr_in6 mask, addr;
struct ifnet *ifp;
in6_newaddrmsg(ia, RTM_DELETE);
ifp = ia->ia_ifa.ifa_ifp;
memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
lltable_prefix_free(AF_INET6, (struct sockaddr *)&addr,
(struct sockaddr *)&mask, LLE_STATIC);
}
/*
* the callers of this function need to be re-worked to drop
* the lle lock, drop here for now
*/
int
nd6_storelladdr(struct ifnet *ifp, struct mbuf *m,
const struct sockaddr *dst, u_char *desten, struct llentry **lle)
{
struct llentry *ln;
*lle = NULL;
IF_AFDATA_UNLOCK_ASSERT(ifp);
if (m != NULL && m->m_flags & M_MCAST) {
int i;
switch (ifp->if_type) {
case IFT_ETHER:
case IFT_FDDI:
#ifdef IFT_L2VLAN
case IFT_L2VLAN:
#endif
#ifdef IFT_IEEE80211
case IFT_IEEE80211:
#endif
case IFT_BRIDGE:
case IFT_ISO88025:
ETHER_MAP_IPV6_MULTICAST(&SIN6(dst)->sin6_addr,
desten);
return (0);
case IFT_IEEE1394:
/*
* netbsd can use if_broadcastaddr, but we don't do so
* to reduce # of ifdef.
*/
for (i = 0; i < ifp->if_addrlen; i++)
desten[i] = ~0;
return (0);
case IFT_ARCNET:
*desten = 0;
return (0);
default:
m_freem(m);
return (EAFNOSUPPORT);
}
}
/*
* the entry should have been created in nd6_store_lladdr
*/
IF_AFDATA_RLOCK(ifp);
ln = lla_lookup(LLTABLE6(ifp), 0, dst);
IF_AFDATA_RUNLOCK(ifp);
if ((ln == NULL) || !(ln->la_flags & LLE_VALID)) {
if (ln != NULL)
LLE_RUNLOCK(ln);
/* this could happen, if we could not allocate memory */
m_freem(m);
return (1);
}
bcopy(&ln->ll_addr, desten, ifp->if_addrlen);
*lle = ln;
LLE_RUNLOCK(ln);
/*
* A *small* use after free race exists here
*/
return (0);
}
static void
clear_llinfo_pqueue(struct llentry *ln)
{
struct mbuf *m_hold, *m_hold_next;
for (m_hold = ln->la_hold; m_hold; m_hold = m_hold_next) {
m_hold_next = m_hold->m_nextpkt;
m_freem(m_hold);
}
ln->la_hold = NULL;
return;
}
static int nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS);
static int nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS);
#ifdef SYSCTL_DECL
SYSCTL_DECL(_net_inet6_icmp6);
#endif
SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist,
CTLFLAG_RD, nd6_sysctl_drlist, "");
SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_PRLIST, nd6_prlist,
CTLFLAG_RD, nd6_sysctl_prlist, "");
SYSCTL_VNET_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MAXQLEN, nd6_maxqueuelen,
CTLFLAG_RW, &VNET_NAME(nd6_maxqueuelen), 1, "");
SYSCTL_VNET_INT(_net_inet6_icmp6, OID_AUTO, nd6_gctimer,
CTLFLAG_RW, &VNET_NAME(nd6_gctimer), (60 * 60 * 24), "");
static int
nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS)
{
struct in6_defrouter d;
struct nd_defrouter *dr;
int error;
if (req->newptr)
return (EPERM);
bzero(&d, sizeof(d));
d.rtaddr.sin6_family = AF_INET6;
d.rtaddr.sin6_len = sizeof(d.rtaddr);
/*
* XXX locking
*/
TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
d.rtaddr.sin6_addr = dr->rtaddr;
error = sa6_recoverscope(&d.rtaddr);
if (error != 0)
return (error);
d.flags = dr->flags;
d.rtlifetime = dr->rtlifetime;
d.expire = dr->expire + (time_second - time_uptime);
d.if_index = dr->ifp->if_index;
error = SYSCTL_OUT(req, &d, sizeof(d));
if (error != 0)
return (error);
}
return (0);
}
static int
nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS)
{
struct in6_prefix p;
struct sockaddr_in6 s6;
struct nd_prefix *pr;
struct nd_pfxrouter *pfr;
time_t maxexpire;
int error;
char ip6buf[INET6_ADDRSTRLEN];
if (req->newptr)
return (EPERM);
bzero(&p, sizeof(p));
p.origin = PR_ORIG_RA;
bzero(&s6, sizeof(s6));
s6.sin6_family = AF_INET6;
s6.sin6_len = sizeof(s6);
/*
* XXX locking
*/
LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
p.prefix = pr->ndpr_prefix;
if (sa6_recoverscope(&p.prefix)) {
log(LOG_ERR, "scope error in prefix list (%s)\n",
ip6_sprintf(ip6buf, &p.prefix.sin6_addr));
/* XXX: press on... */
}
p.raflags = pr->ndpr_raf;
p.prefixlen = pr->ndpr_plen;
p.vltime = pr->ndpr_vltime;
p.pltime = pr->ndpr_pltime;
p.if_index = pr->ndpr_ifp->if_index;
if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME)
p.expire = 0;
else {
/* XXX: we assume time_t is signed. */
maxexpire = (-1) &
~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
if (pr->ndpr_vltime < maxexpire - pr->ndpr_lastupdate)
p.expire = pr->ndpr_lastupdate +
pr->ndpr_vltime +
(time_second - time_uptime);
else
p.expire = maxexpire;
}
p.refcnt = pr->ndpr_refcnt;
p.flags = pr->ndpr_stateflags;
p.advrtrs = 0;
LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry)
p.advrtrs++;
error = SYSCTL_OUT(req, &p, sizeof(p));
if (error != 0)
return (error);
LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) {
s6.sin6_addr = pfr->router->rtaddr;
if (sa6_recoverscope(&s6))
log(LOG_ERR,
"scope error in prefix list (%s)\n",
ip6_sprintf(ip6buf, &pfr->router->rtaddr));
error = SYSCTL_OUT(req, &s6, sizeof(s6));
if (error != 0)
return (error);
}
}
return (0);
}
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