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NetBSD/sys/netinet6/nd6.c

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/* $NetBSD: nd6.c,v 1.248 2018/05/01 07:21:39 maxv Exp $ */
/* $KAME: nd6.c,v 1.279 2002/06/08 11:16:51 itojun Exp $ */
/*
* 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: nd6.c,v 1.248 2018/05/01 07:21:39 maxv Exp $");
#ifdef _KERNEL_OPT
#include "opt_net_mpsafe.h"
#endif
#include "bridge.h"
#include "carp.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/callout.h>
#include <sys/kmem.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sockio.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/syslog.h>
#include <sys/queue.h>
#include <sys/cprng.h>
#include <sys/workqueue.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_llatbl.h>
#include <net/if_types.h>
#include <net/route.h>
#include <net/if_ether.h>
#include <net/if_fddi.h>
#include <net/if_arc.h>
#include <netinet/in.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/icmp6_private.h>
#define ND6_SLOWTIMER_INTERVAL (60 * 60) /* 1 hour */
#define ND6_RECALC_REACHTM_INTERVAL (60 * 120) /* 2 hours */
/* timer values */
int nd6_prune = 1; /* walk list every 1 seconds */
int nd6_delay = 5; /* delay first probe time 5 second */
int nd6_umaxtries = 3; /* maximum unicast query */
int nd6_mmaxtries = 3; /* maximum multicast query */
int nd6_useloopback = 1; /* use loopback interface for local traffic */
int nd6_gctimer = (60 * 60 * 24); /* 1 day: garbage collection timer */
/* preventing too many loops in ND option parsing */
int nd6_maxndopt = 10; /* max # of ND options allowed */
int nd6_maxnudhint = 0; /* max # of subsequent upper layer hints */
int nd6_maxqueuelen = 1; /* max # of packets cached in unresolved ND entries */
#ifdef ND6_DEBUG
int nd6_debug = 1;
#else
int nd6_debug = 0;
#endif
krwlock_t nd6_lock __cacheline_aligned;
struct nd_drhead nd_defrouter;
struct nd_prhead nd_prefix = { 0 };
int nd6_recalc_reachtm_interval = ND6_RECALC_REACHTM_INTERVAL;
static void nd6_setmtu0(struct ifnet *, struct nd_ifinfo *);
static void nd6_slowtimo(void *);
static int regen_tmpaddr(const struct in6_ifaddr *);
static void nd6_free(struct llentry *, int);
static void nd6_llinfo_timer(void *);
static void nd6_timer(void *);
static void nd6_timer_work(struct work *, void *);
static void clear_llinfo_pqueue(struct llentry *);
static struct nd_opt_hdr *nd6_option(union nd_opts *);
static callout_t nd6_slowtimo_ch;
static callout_t nd6_timer_ch;
static struct workqueue *nd6_timer_wq;
static struct work nd6_timer_wk;
static int fill_drlist(void *, size_t *);
static int fill_prlist(void *, size_t *);
static struct ifnet *nd6_defifp;
static int nd6_defifindex;
static int nd6_setdefaultiface(int);
MALLOC_DEFINE(M_IP6NDP, "NDP", "IPv6 Neighbour Discovery");
void
nd6_init(void)
{
int error;
rw_init(&nd6_lock);
/* initialization of the default router list */
ND_DEFROUTER_LIST_INIT();
callout_init(&nd6_slowtimo_ch, CALLOUT_MPSAFE);
callout_init(&nd6_timer_ch, CALLOUT_MPSAFE);
error = workqueue_create(&nd6_timer_wq, "nd6_timer",
nd6_timer_work, NULL, PRI_SOFTNET, IPL_SOFTNET, WQ_MPSAFE);
if (error)
panic("%s: workqueue_create failed (%d)\n", __func__, error);
/* start timer */
callout_reset(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,
nd6_slowtimo, NULL);
callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
}
struct nd_ifinfo *
nd6_ifattach(struct ifnet *ifp)
{
struct nd_ifinfo *nd;
nd = kmem_zalloc(sizeof(*nd), KM_SLEEP);
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 | ND6_IFF_ACCEPT_RTADV;
/* A loopback interface always has ND6_IFF_AUTO_LINKLOCAL.
* A bridge interface should not have ND6_IFF_AUTO_LINKLOCAL
* because one of its members should. */
if ((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.
* A bridge interface should not accept RTADV
* because one of its members should. */
if (ip6_accept_rtadv &&
!(ifp->if_flags & IFF_LOOPBACK) &&
!(ifp->if_type != IFT_BRIDGE))
nd->flags |= ND6_IFF_ACCEPT_RTADV;
/* XXX: we cannot call nd6_setmtu since ifp is not fully initialized */
nd6_setmtu0(ifp, nd);
return nd;
}
void
nd6_ifdetach(struct ifnet *ifp, struct in6_ifextra *ext)
{
/* Ensure all IPv6 addresses are purged before calling nd6_purge */
if_purgeaddrs(ifp, AF_INET6, in6_purgeaddr);
nd6_purge(ifp, ext);
kmem_free(ext->nd_ifinfo, sizeof(struct nd_ifinfo));
}
void
nd6_setmtu(struct ifnet *ifp)
{
nd6_setmtu0(ifp, ND_IFINFO(ifp));
}
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);
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 which needs %lu\n",
if_name(ifp), (unsigned long)ndi->maxmtu, (unsigned long)
IPV6_MMTU);
}
if (ndi->maxmtu > in6_maxmtu)
in6_setmaxmtu(); /* check all interfaces just in case */
}
void
nd6_option_init(void *opt, int icmp6len, union nd_opts *ndopts)
{
memset(ndopts, 0, 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.
*/
static struct nd_opt_hdr *
nd6_option(union nd_opts *ndopts)
{
struct nd_opt_hdr *nd_opt;
int olen;
KASSERT(ndopts != NULL);
KASSERT(ndopts->nd_opts_last != NULL);
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 ((void *)&nd_opt->nd_opt_len >= (void *)ndopts->nd_opts_last) {
memset(ndopts, 0, 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.
*/
memset(ndopts, 0, sizeof(*ndopts));
return NULL;
}
ndopts->nd_opts_search = (struct nd_opt_hdr *)((char *)nd_opt + olen);
if (ndopts->nd_opts_search > ndopts->nd_opts_last) {
/* option overruns the end of buffer, invalid */
memset(ndopts, 0, 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);
KASSERT(ndopts->nd_opts_last != NULL);
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.
*/
ICMP6_STATINC(ICMP6_STAT_ND_BADOPT);
memset(ndopts, 0, 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:
case ND_OPT_NONCE:
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;
default:
/*
* Unknown options must be silently ignored,
* to accommodate 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 > nd6_maxndopt) {
ICMP6_STATINC(ICMP6_STAT_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(struct llentry *ln, time_t xtick)
{
CTASSERT(sizeof(time_t) > sizeof(int));
LLE_WLOCK_ASSERT(ln);
KASSERT(xtick >= 0);
/*
* We have to take care of a reference leak which occurs if
* callout_reset overwrites a pending callout schedule. Unfortunately
* we don't have a mean to know the overwrite, so we need to know it
* using callout_stop. We need to call callout_pending first to exclude
* the case that the callout has never been scheduled.
*/
if (callout_pending(&ln->la_timer)) {
bool expired = callout_stop(&ln->la_timer);
if (!expired)
LLE_REMREF(ln);
}
ln->ln_expire = time_uptime + xtick / hz;
LLE_ADDREF(ln);
if (xtick > INT_MAX) {
ln->ln_ntick = xtick - INT_MAX;
callout_reset(&ln->ln_timer_ch, INT_MAX,
nd6_llinfo_timer, ln);
} else {
ln->ln_ntick = 0;
callout_reset(&ln->ln_timer_ch, xtick,
nd6_llinfo_timer, ln);
}
}
/*
* Gets source address of the first packet in hold queue
* and stores it in @src.
* Returns pointer to @src (if hold queue is not empty) or NULL.
*/
static struct in6_addr *
nd6_llinfo_get_holdsrc(struct llentry *ln, struct in6_addr *src)
{
struct ip6_hdr *hip6;
if (ln == NULL || ln->ln_hold == NULL)
return NULL;
/*
* assuming every packet in ln_hold has the same IP header
*/
hip6 = mtod(ln->ln_hold, struct ip6_hdr *);
/* XXX pullup? */
if (sizeof(*hip6) < ln->ln_hold->m_len)
*src = hip6->ip6_src;
else
src = NULL;
return src;
}
static void
nd6_llinfo_timer(void *arg)
{
struct llentry *ln = arg;
struct ifnet *ifp;
struct nd_ifinfo *ndi = NULL;
bool send_ns = false;
const struct in6_addr *daddr6 = NULL;
SOFTNET_KERNEL_LOCK_UNLESS_NET_MPSAFE();
LLE_WLOCK(ln);
if ((ln->la_flags & LLE_LINKED) == 0)
goto out;
if (ln->ln_ntick > 0) {
nd6_llinfo_settimer(ln, ln->ln_ntick);
goto out;
}
ifp = ln->lle_tbl->llt_ifp;
KASSERT(ifp != NULL);
ndi = ND_IFINFO(ifp);
switch (ln->ln_state) {
case ND6_LLINFO_INCOMPLETE:
if (ln->ln_asked < nd6_mmaxtries) {
ln->ln_asked++;
send_ns = true;
} else {
struct mbuf *m = ln->ln_hold;
if (m) {
struct mbuf *m0;
/*
* assuming every packet in ln_hold has
* the same IP header
*/
m0 = m->m_nextpkt;
m->m_nextpkt = NULL;
ln->ln_hold = m0;
clear_llinfo_pqueue(ln);
}
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(ln, nd6_gctimer * hz);
}
break;
case ND6_LLINFO_PURGE:
case ND6_LLINFO_STALE:
/* Garbage Collection(RFC 2461 5.3) */
if (!ND6_LLINFO_PERMANENT(ln)) {
nd6_free(ln, 1);
ln = NULL;
}
break;
case ND6_LLINFO_DELAY:
if (ndi && (ndi->flags & ND6_IFF_PERFORMNUD) != 0) {
/* We need NUD */
ln->ln_asked = 1;
ln->ln_state = ND6_LLINFO_PROBE;
daddr6 = &ln->r_l3addr.addr6;
send_ns = true;
} else {
ln->ln_state = ND6_LLINFO_STALE; /* XXX */
nd6_llinfo_settimer(ln, nd6_gctimer * hz);
}
break;
case ND6_LLINFO_PROBE:
if (ln->ln_asked < nd6_umaxtries) {
ln->ln_asked++;
daddr6 = &ln->r_l3addr.addr6;
send_ns = true;
} else {
nd6_free(ln, 0);
ln = NULL;
}
break;
}
if (send_ns) {
struct in6_addr src, *psrc;
const struct in6_addr *taddr6 = &ln->r_l3addr.addr6;
nd6_llinfo_settimer(ln, ndi->retrans * hz / 1000);
psrc = nd6_llinfo_get_holdsrc(ln, &src);
LLE_FREE_LOCKED(ln);
ln = NULL;
nd6_ns_output(ifp, daddr6, taddr6, psrc, NULL);
}
out:
if (ln != NULL)
LLE_FREE_LOCKED(ln);
SOFTNET_KERNEL_UNLOCK_UNLESS_NET_MPSAFE();
}
/*
* ND6 timer routine to expire default route list and prefix list
*/
static void
nd6_timer_work(struct work *wk, void *arg)
{
struct nd_defrouter *next_dr, *dr;
struct nd_prefix *next_pr, *pr;
struct in6_ifaddr *ia6, *nia6;
int s, bound;
struct psref psref;
callout_reset(&nd6_timer_ch, nd6_prune * hz,
nd6_timer, NULL);
SOFTNET_KERNEL_LOCK_UNLESS_NET_MPSAFE();
/* expire default router list */
ND6_WLOCK();
ND_DEFROUTER_LIST_FOREACH_SAFE(dr, next_dr) {
if (dr->expire && dr->expire < time_uptime) {
nd6_defrtrlist_del(dr, NULL);
}
}
ND6_UNLOCK();
/*
* 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.
*/
bound = curlwp_bind();
addrloop:
s = pserialize_read_enter();
for (ia6 = IN6_ADDRLIST_READER_FIRST(); ia6; ia6 = nia6) {
nia6 = IN6_ADDRLIST_READER_NEXT(ia6);
ia6_acquire(ia6, &psref);
pserialize_read_exit(s);
/* check address lifetime */
if (IFA6_IS_INVALID(ia6)) {
int regen = 0;
struct ifnet *ifp;
/*
* 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 (ip6_use_tempaddr &&
(ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
IFNET_LOCK(ia6->ia_ifa.ifa_ifp);
if (regen_tmpaddr(ia6) == 0)
regen = 1;
IFNET_UNLOCK(ia6->ia_ifa.ifa_ifp);
}
ifp = ia6->ia_ifa.ifa_ifp;
IFNET_LOCK(ifp);
/*
* Need to take the lock first to prevent if_detach
* from running in6_purgeaddr concurrently.
*/
if (!if_is_deactivated(ifp)) {
ia6_release(ia6, &psref);
in6_purgeaddr(&ia6->ia_ifa);
} else {
/*
* ifp is being destroyed, ia6 will be destroyed
* by if_detach.
*/
ia6_release(ia6, &psref);
}
ia6 = NULL;
IFNET_UNLOCK(ifp);
if (regen)
goto addrloop; /* XXX: see below */
} else if (IFA6_IS_DEPRECATED(ia6)) {
int oldflags = ia6->ia6_flags;
if ((oldflags & IN6_IFF_DEPRECATED) == 0) {
ia6->ia6_flags |= IN6_IFF_DEPRECATED;
rt_newaddrmsg(RTM_NEWADDR,
(struct ifaddr *)ia6, 0, NULL);
}
/*
* If a temporary address has just become deprecated,
* regenerate a new one if possible.
*/
if (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??
*/
ia6_release(ia6, &psref);
goto addrloop;
}
}
} else {
/*
* A new RA might have made a deprecated address
* preferred.
*/
if (ia6->ia6_flags & IN6_IFF_DEPRECATED) {
ia6->ia6_flags &= ~IN6_IFF_DEPRECATED;
rt_newaddrmsg(RTM_NEWADDR,
(struct ifaddr *)ia6, 0, NULL);
}
}
s = pserialize_read_enter();
ia6_release(ia6, &psref);
}
pserialize_read_exit(s);
curlwp_bindx(bound);
/* expire prefix list */
ND6_WLOCK();
ND_PREFIX_LIST_FOREACH_SAFE(pr, next_pr) {
/*
* 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) {
/*
* Just invalidate the prefix here. Removing it
* will be done when purging an associated address.
*/
KASSERT(pr->ndpr_refcnt > 0);
nd6_invalidate_prefix(pr);
}
}
ND6_UNLOCK();
SOFTNET_KERNEL_UNLOCK_UNLESS_NET_MPSAFE();
}
static void
nd6_timer(void *ignored_arg)
{
workqueue_enqueue(nd6_timer_wq, &nd6_timer_wk, NULL);
}
/* ia6: deprecated/invalidated temporary address */
static int
regen_tmpaddr(const struct in6_ifaddr *ia6)
{
struct ifaddr *ifa;
struct ifnet *ifp;
struct in6_ifaddr *public_ifa6 = NULL;
int s;
ifp = ia6->ia_ifa.ifa_ifp;
s = pserialize_read_enter();
IFADDR_READER_FOREACH(ifa, ifp) {
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) {
int e;
struct psref psref;
ia6_acquire(public_ifa6, &psref);
pserialize_read_exit(s);
/*
* Random factor is introduced in the preferred lifetime, so
* we do not need additional delay (3rd arg to in6_tmpifadd).
*/
ND6_WLOCK();
e = in6_tmpifadd(public_ifa6, 0, 0);
ND6_UNLOCK();
if (e != 0) {
ia6_release(public_ifa6, &psref);
log(LOG_NOTICE, "regen_tmpaddr: failed to create a new"
" tmp addr, errno=%d\n", e);
return -1;
}
ia6_release(public_ifa6, &psref);
return 0;
}
pserialize_read_exit(s);
return -1;
}
bool
nd6_accepts_rtadv(const struct nd_ifinfo *ndi)
{
switch (ndi->flags & (ND6_IFF_ACCEPT_RTADV|ND6_IFF_OVERRIDE_RTADV)) {
case ND6_IFF_OVERRIDE_RTADV|ND6_IFF_ACCEPT_RTADV:
return true;
case ND6_IFF_ACCEPT_RTADV:
return ip6_accept_rtadv != 0;
case ND6_IFF_OVERRIDE_RTADV:
case 0:
default:
return false;
}
}
/*
* Nuke neighbor cache/prefix/default router management table, right before
* ifp goes away.
*/
void
nd6_purge(struct ifnet *ifp, struct in6_ifextra *ext)
{
struct nd_defrouter *dr, *ndr;
struct nd_prefix *pr, *npr;
/*
* During detach, the ND info might be already removed, but
* then is explitly passed as argument.
* Otherwise get it from ifp->if_afdata.
*/
if (ext == NULL)
ext = ifp->if_afdata[AF_INET6];
if (ext == NULL)
return;
ND6_WLOCK();
/*
* 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.
*/
ND_DEFROUTER_LIST_FOREACH_SAFE(dr, ndr) {
if (dr->installed)
continue;
if (dr->ifp == ifp) {
KASSERT(ext != NULL);
nd6_defrtrlist_del(dr, ext);
}
}
ND_DEFROUTER_LIST_FOREACH_SAFE(dr, ndr) {
if (!dr->installed)
continue;
if (dr->ifp == ifp) {
KASSERT(ext != NULL);
nd6_defrtrlist_del(dr, ext);
}
}
/* Nuke prefix list entries toward ifp */
ND_PREFIX_LIST_FOREACH_SAFE(pr, npr) {
if (pr->ndpr_ifp == ifp) {
/*
* All addresses referencing pr should be already freed.
*/
KASSERT(pr->ndpr_refcnt == 0);
nd6_prelist_remove(pr);
}
}
/* cancel default outgoing interface setting */
if (nd6_defifindex == ifp->if_index)
nd6_setdefaultiface(0);
/* XXX: too restrictive? */
if (!ip6_forwarding && ifp->if_afdata[AF_INET6]) {
struct nd_ifinfo *ndi = ND_IFINFO(ifp);
if (ndi && nd6_accepts_rtadv(ndi)) {
/* refresh default router list */
nd6_defrouter_select();
}
}
ND6_UNLOCK();
/*
* We may not need to nuke the neighbor cache entries here
* 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. However
* in6_ifdetach is directly called from vlan(4), so we still
* need to purge entries here.
*/
if (ext->lltable != NULL)
lltable_purge_entries(ext->lltable);
}
void
nd6_assert_purged(struct ifnet *ifp)
{
struct nd_defrouter *dr;
struct nd_prefix *pr;
char ip6buf[INET6_ADDRSTRLEN] __diagused;
ND6_RLOCK();
ND_DEFROUTER_LIST_FOREACH(dr) {
KASSERTMSG(dr->ifp != ifp,
"defrouter %s remains on %s",
IN6_PRINT(ip6buf, &dr->rtaddr), ifp->if_xname);
}
ND_PREFIX_LIST_FOREACH(pr) {
KASSERTMSG(pr->ndpr_ifp != ifp,
"prefix %s/%d remains on %s",
IN6_PRINT(ip6buf, &pr->ndpr_prefix.sin6_addr),
pr->ndpr_plen, ifp->if_xname);
}
ND6_UNLOCK();
}
struct llentry *
nd6_lookup(const struct in6_addr *addr6, const struct ifnet *ifp, bool wlock)
{
struct sockaddr_in6 sin6;
struct llentry *ln;
sockaddr_in6_init(&sin6, addr6, 0, 0, 0);
IF_AFDATA_RLOCK(ifp);
ln = lla_lookup(LLTABLE6(ifp), wlock ? LLE_EXCLUSIVE : 0,
sin6tosa(&sin6));
IF_AFDATA_RUNLOCK(ifp);
return ln;
}
struct llentry *
nd6_create(const struct in6_addr *addr6, const struct ifnet *ifp)
{
struct sockaddr_in6 sin6;
struct llentry *ln;
struct rtentry *rt;
sockaddr_in6_init(&sin6, addr6, 0, 0, 0);
rt = rtalloc1(sin6tosa(&sin6), 0);
IF_AFDATA_WLOCK(ifp);
ln = lla_create(LLTABLE6(ifp), LLE_EXCLUSIVE, sin6tosa(&sin6), rt);
IF_AFDATA_WUNLOCK(ifp);
if (rt != NULL)
rt_unref(rt);
if (ln != NULL)
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(const struct sockaddr_in6 *addr, struct ifnet *ifp)
{
struct nd_prefix *pr;
struct ifaddr *dstaddr;
int s;
/*
* 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.
*/
ND6_RLOCK();
ND_PREFIX_LIST_FOREACH(pr) {
if (pr->ndpr_ifp != ifp)
continue;
if (!(pr->ndpr_stateflags & NDPRF_ONLINK)) {
struct rtentry *rt;
rt = rtalloc1(sin6tosa(&pr->ndpr_prefix), 0);
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,
&satocsin6(rt_getkey(rt))->sin6_addr)) {
rt_unref(rt);
continue;
}
rt_unref(rt);
}
if (IN6_ARE_MASKED_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr,
&addr->sin6_addr, &pr->ndpr_mask)) {
ND6_UNLOCK();
return 1;
}
}
ND6_UNLOCK();
/*
* If the address is assigned on the node of the other side of
* a p2p interface, the address should be a neighbor.
*/
s = pserialize_read_enter();
dstaddr = ifa_ifwithdstaddr(sin6tocsa(addr));
if (dstaddr != NULL) {
if (dstaddr->ifa_ifp == ifp) {
pserialize_read_exit(s);
return 1;
}
}
pserialize_read_exit(s);
/*
* If the default router list is empty, all addresses are regarded
* as on-link, and thus, as a neighbor.
*/
ND6_RLOCK();
if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV &&
ND_DEFROUTER_LIST_EMPTY() && nd6_defifindex == ifp->if_index) {
ND6_UNLOCK();
return 1;
}
ND6_UNLOCK();
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(const struct sockaddr_in6 *addr, struct ifnet *ifp)
{
struct nd_prefix *pr;
struct llentry *ln;
struct rtentry *rt;
/*
* 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 on-link prefixes, it should be a
* neighbor.
*/
ND6_RLOCK();
ND_PREFIX_LIST_FOREACH(pr) {
if (pr->ndpr_ifp != ifp)
continue;
if (!(pr->ndpr_stateflags & NDPRF_ONLINK))
continue;
if (IN6_ARE_MASKED_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr,
&addr->sin6_addr, &pr->ndpr_mask)) {
ND6_UNLOCK();
return 1;
}
}
/*
* If the default router list is empty, all addresses are regarded
* as on-link, and thus, as a neighbor.
* XXX: we restrict the condition to hosts, because routers usually do
* not have the "default router list".
*/
if (!ip6_forwarding && ND_DEFROUTER_LIST_EMPTY() &&
nd6_defifindex == ifp->if_index) {
ND6_UNLOCK();
return 1;
}
ND6_UNLOCK();
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 or a connected route.
*/
ln = nd6_lookup(&addr->sin6_addr, ifp, false);
if (ln != NULL) {
LLE_RUNLOCK(ln);
return 1;
}
rt = rtalloc1(sin6tocsa(addr), 0);
if (rt == NULL)
return 0;
if ((rt->rt_flags & RTF_CONNECTED) && (rt->rt_ifp == ifp
#if NBRIDGE > 0
|| rt->rt_ifp->if_bridge == ifp->if_bridge
#endif
#if NCARP > 0
|| (ifp->if_type == IFT_CARP && rt->rt_ifp == ifp->if_carpdev) ||
(rt->rt_ifp->if_type == IFT_CARP && rt->rt_ifp->if_carpdev == ifp)||
(ifp->if_type == IFT_CARP && rt->rt_ifp->if_type == IFT_CARP &&
rt->rt_ifp->if_carpdev == ifp->if_carpdev)
#endif
)) {
rt_unref(rt);
return 1;
}
rt_unref(rt);
return 0;
}
/*
* 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 void
nd6_free(struct llentry *ln, int gc)
{
struct nd_defrouter *dr;
struct ifnet *ifp;
struct in6_addr *in6;
KASSERT(ln != NULL);
LLE_WLOCK_ASSERT(ln);
ifp = ln->lle_tbl->llt_ifp;
in6 = &ln->r_l3addr.addr6;
/*
* we used to have pfctlinput(PRC_HOSTDEAD) here.
* even though it is not harmful, it was not really necessary.
*/
if (!ip6_forwarding) {
ND6_WLOCK();
dr = nd6_defrouter_lookup(in6, 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(ln,
(dr->expire - time_uptime) * hz);
else
nd6_llinfo_settimer(ln, nd6_gctimer * hz);
ND6_UNLOCK();
LLE_WUNLOCK(ln);
return;
}
if (ln->ln_router || dr) {
/*
* We need to unlock to avoid a LOR with nd6_rt_flush()
* with the rnh and for the calls to
* nd6_pfxlist_onlink_check() and nd6_defrouter_select() in the
* block further down for calls into nd6_lookup().
* We still hold a ref.
*/
LLE_WUNLOCK(ln);
/*
* nd6_rt_flush must be called whether or not the neighbor
* is in the Default Router List.
* See a corresponding comment in nd6_na_input().
*/
nd6_rt_flush(in6, ifp);
}
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;
/*
* Since nd6_defrouter_select() does not affect the
* on-link determination and MIP6 needs the check
* before the default router selection, we perform
* the check now.
*/
nd6_pfxlist_onlink_check();
/*
* refresh default router list
*/
nd6_defrouter_select();
}
#ifdef __FreeBSD__
/*
* If this entry was added by an on-link redirect, remove the
* corresponding host route.
*/
if (ln->la_flags & LLE_REDIRECT)
nd6_free_redirect(ln);
#endif
ND6_UNLOCK();
if (ln->ln_router || dr)
LLE_WLOCK(ln);
}
/*
* 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);
lltable_free_entry(LLTABLE6(ifp), ln);
IF_AFDATA_UNLOCK(ifp);
}
/*
* Upper-layer reachability hint for Neighbor Unreachability Detection.
*
* XXX cost-effective methods?
*/
void
nd6_nud_hint(struct rtentry *rt)
{
struct llentry *ln;
struct ifnet *ifp;
if (rt == NULL)
return;
ifp = rt->rt_ifp;
ln = nd6_lookup(&(satocsin6(rt_getkey(rt)))->sin6_addr, ifp, true);
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.
*/
ln->ln_byhint++;
if (ln->ln_byhint > nd6_maxnudhint)
goto done;
ln->ln_state = ND6_LLINFO_REACHABLE;
if (!ND6_LLINFO_PERMANENT(ln))
nd6_llinfo_settimer(ln, ND_IFINFO(rt->rt_ifp)->reachable * hz);
done:
LLE_WUNLOCK(ln);
return;
}
struct gc_args {
int gc_entries;
const struct in6_addr *skip_in6;
};
static int
nd6_purge_entry(struct lltable *llt, struct llentry *ln, void *farg)
{
struct gc_args *args = farg;
int *n = &args->gc_entries;
const struct in6_addr *skip_in6 = args->skip_in6;
if (*n <= 0)
return 0;
if (ND6_LLINFO_PERMANENT(ln))
return 0;
if (IN6_ARE_ADDR_EQUAL(&ln->r_l3addr.addr6, skip_in6))
return 0;
LLE_WLOCK(ln);
if (ln->ln_state > ND6_LLINFO_INCOMPLETE)
ln->ln_state = ND6_LLINFO_STALE;
else
ln->ln_state = ND6_LLINFO_PURGE;
nd6_llinfo_settimer(ln, 0);
LLE_WUNLOCK(ln);
(*n)--;
return 0;
}
static void
nd6_gc_neighbors(struct lltable *llt, const struct in6_addr *in6)
{
if (ip6_neighborgcthresh >= 0 &&
lltable_get_entry_count(llt) >= ip6_neighborgcthresh) {
struct gc_args gc_args = {10, in6};
/*
* XXX entries that are "less recently used" should be
* freed first.
*/
lltable_foreach_lle(llt, nd6_purge_entry, &gc_args);
}
}
void
nd6_rtrequest(int req, struct rtentry *rt, const struct rt_addrinfo *info)
{
struct sockaddr *gate = rt->rt_gateway;
struct ifnet *ifp = rt->rt_ifp;
uint8_t namelen = strlen(ifp->if_xname), addrlen = ifp->if_addrlen;
struct ifaddr *ifa;
RT_DPRINTF("rt_getkey(rt) = %p\n", rt_getkey(rt));
if (req == RTM_LLINFO_UPD) {
int rc;
struct in6_addr *in6;
struct in6_addr in6_all;
int anycast;
if ((ifa = info->rti_ifa) == NULL)
return;
in6 = &ifatoia6(ifa)->ia_addr.sin6_addr;
anycast = ifatoia6(ifa)->ia6_flags & IN6_IFF_ANYCAST;
in6_all = in6addr_linklocal_allnodes;
if ((rc = in6_setscope(&in6_all, ifa->ifa_ifp, NULL)) != 0) {
log(LOG_ERR, "%s: failed to set scope %s "
"(errno=%d)\n", __func__, if_name(ifp), rc);
return;
}
/* XXX don't set Override for proxy addresses */
nd6_na_output(ifa->ifa_ifp, &in6_all, in6,
(anycast ? 0 : ND_NA_FLAG_OVERRIDE)
#if 0
| (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0)
#endif
, 1, NULL);
return;
}
if ((rt->rt_flags & RTF_GATEWAY) != 0)
return;
if (nd6_need_cache(ifp) == 0 && (rt->rt_flags & RTF_HOST) == 0) {
RT_DPRINTF("rt_getkey(rt) = %p\n", rt_getkey(rt));
/*
* This is probably an interface direct route for a link
* which does not need neighbor caches (e.g. fe80::%lo0/64).
* We do not need special treatment below for such a route.
* Moreover, the RTF_LLINFO flag which would be set below
* would annoy the ndp(8) command.
*/
return;
}
switch (req) {
case RTM_ADD: {
struct psref psref;
RT_DPRINTF("rt_getkey(rt) = %p\n", rt_getkey(rt));
/*
* There is no backward compatibility :)
*
* if ((rt->rt_flags & RTF_HOST) == 0 &&
* SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff)
* rt->rt_flags |= RTF_CLONING;
*/
/* XXX should move to route.c? */
if (rt->rt_flags & (RTF_CONNECTED | RTF_LOCAL)) {
union {
struct sockaddr sa;
struct sockaddr_dl sdl;
struct sockaddr_storage ss;
} u;
/*
* Case 1: This route should come from a route to
* interface (RTF_CLONING case) or the route should be
* treated as on-link but is currently not
* (RTF_LLINFO && ln == NULL case).
*/
if (sockaddr_dl_init(&u.sdl, sizeof(u.ss),
ifp->if_index, ifp->if_type,
NULL, namelen, NULL, addrlen) == NULL) {
printf("%s.%d: sockaddr_dl_init(, %zu, ) "
"failed on %s\n", __func__, __LINE__,
sizeof(u.ss), if_name(ifp));
}
rt_setgate(rt, &u.sa);
gate = rt->rt_gateway;
RT_DPRINTF("rt_getkey(rt) = %p\n", rt_getkey(rt));
if (gate == NULL) {
log(LOG_ERR,
"%s: rt_setgate failed on %s\n", __func__,
if_name(ifp));
break;
}
RT_DPRINTF("rt_getkey(rt) = %p\n", rt_getkey(rt));
if ((rt->rt_flags & RTF_CONNECTED) != 0)
break;
}
RT_DPRINTF("rt_getkey(rt) = %p\n", rt_getkey(rt));
/*
* In IPv4 code, we try to annonuce new RTF_ANNOUNCE entry here.
* We don't do that here since llinfo is not ready yet.
*
* There are also couple of other things to be discussed:
* - unsolicited NA code needs improvement beforehand
* - RFC2461 says we MAY send multicast unsolicited NA
* (7.2.6 paragraph 4), however, it also says that we
* SHOULD provide a mechanism to prevent multicast NA storm.
* we don't have anything like it right now.
* note that the mechanism needs a mutual agreement
* between proxies, which means that we need to implement
* a new protocol, or a new kludge.
* - from RFC2461 6.2.4, host MUST NOT send an unsolicited NA.
* we need to check ip6forwarding before sending it.
* (or should we allow proxy ND configuration only for
* routers? there's no mention about proxy ND from hosts)
*/
#if 0
/* XXX it does not work */
if (rt->rt_flags & RTF_ANNOUNCE)
nd6_na_output(ifp,
&satocsin6(rt_getkey(rt))->sin6_addr,
&satocsin6(rt_getkey(rt))->sin6_addr,
ip6_forwarding ? ND_NA_FLAG_ROUTER : 0,
1, NULL);
#endif
if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) == 0) {
RT_DPRINTF("rt_getkey(rt) = %p\n", rt_getkey(rt));
/*
* Address resolution isn't necessary for a point to
* point link, so we can skip this test for a p2p link.
*/
if (gate->sa_family != AF_LINK ||
gate->sa_len <
sockaddr_dl_measure(namelen, addrlen)) {
log(LOG_DEBUG,
"nd6_rtrequest: bad gateway value: %s\n",
if_name(ifp));
break;
}
satosdl(gate)->sdl_type = ifp->if_type;
satosdl(gate)->sdl_index = ifp->if_index;
RT_DPRINTF("rt_getkey(rt) = %p\n", rt_getkey(rt));
}
RT_DPRINTF("rt_getkey(rt) = %p\n", rt_getkey(rt));
/*
* When called from rt_ifa_addlocal, we cannot depend on that
* the address (rt_getkey(rt)) exits in the address list of the
* interface. So check RTF_LOCAL instead.
*/
if (rt->rt_flags & RTF_LOCAL) {
if (nd6_useloopback)
rt->rt_ifp = lo0ifp; /* XXX */
break;
}
/*
* check if rt_getkey(rt) is an address assigned
* to the interface.
*/
ifa = (struct ifaddr *)in6ifa_ifpwithaddr_psref(ifp,
&satocsin6(rt_getkey(rt))->sin6_addr, &psref);
if (ifa != NULL) {
if (nd6_useloopback) {
rt->rt_ifp = lo0ifp; /* XXX */
/*
* Make sure rt_ifa be equal to the ifaddr
* corresponding to the address.
* We need this because when we refer
* rt_ifa->ia6_flags in ip6_input, we assume
* that the rt_ifa points to the address instead
* of the loopback address.
*/
if (ifa != rt->rt_ifa)
rt_replace_ifa(rt, ifa);
}
} else if (rt->rt_flags & RTF_ANNOUNCE) {
/* join solicited node multicast for proxy ND */
if (ifp->if_flags & IFF_MULTICAST) {
struct in6_addr llsol;
int error;
llsol = satocsin6(rt_getkey(rt))->sin6_addr;
llsol.s6_addr32[0] = htonl(0xff020000);
llsol.s6_addr32[1] = 0;
llsol.s6_addr32[2] = htonl(1);
llsol.s6_addr8[12] = 0xff;
if (in6_setscope(&llsol, ifp, NULL))
goto out;
if (!in6_addmulti(&llsol, ifp, &error, 0)) {
char ip6buf[INET6_ADDRSTRLEN];
nd6log(LOG_ERR, "%s: failed to join "
"%s (errno=%d)\n", if_name(ifp),
IN6_PRINT(ip6buf, &llsol), error);
}
}
}
out:
ifa_release(ifa, &psref);
/*
* If we have too many cache entries, initiate immediate
* purging for some entries.
*/
if (rt->rt_ifp != NULL)
nd6_gc_neighbors(LLTABLE6(rt->rt_ifp), NULL);
break;
}
case RTM_DELETE:
/* leave from solicited node multicast for proxy ND */
if ((rt->rt_flags & RTF_ANNOUNCE) != 0 &&
(ifp->if_flags & IFF_MULTICAST) != 0) {
struct in6_addr llsol;
struct in6_multi *in6m;
llsol = satocsin6(rt_getkey(rt))->sin6_addr;
llsol.s6_addr32[0] = htonl(0xff020000);
llsol.s6_addr32[1] = 0;
llsol.s6_addr32[2] = htonl(1);
llsol.s6_addr8[12] = 0xff;
if (in6_setscope(&llsol, ifp, NULL) == 0) {
in6m = in6_lookup_multi(&llsol, ifp);
if (in6m)
in6_delmulti(in6m);
}
}
break;
}
}
int
nd6_ioctl(u_long cmd, void *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;
switch (cmd) {
case SIOCGDRLST_IN6:
/*
* obsolete API, use sysctl under net.inet6.icmp6
*/
memset(drl, 0, sizeof(*drl));
ND6_RLOCK();
ND_DEFROUTER_LIST_FOREACH(dr) {
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_mono_to_wall(dr->expire) : 0;
drl->defrouter[i].if_index = dr->ifp->if_index;
i++;
}
ND6_UNLOCK();
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?
*/
memset(oprl, 0, sizeof(*oprl));
ND6_RLOCK();
ND_PREFIX_LIST_FOREACH(pr) {
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) {
time_t expire;
expire = pr->ndpr_lastupdate +
pr->ndpr_vltime;
oprl->prefix[i].expire = expire ?
time_mono_to_wall(expire) : 0;
} 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++;
}
ND6_UNLOCK();
break;
case OSIOCGIFINFO_IN6:
#define ND ndi->ndi
/* XXX: old ndp(8) assumes a positive value for linkmtu. */
memset(&ND, 0, 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;
int s;
if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
!(ND.flags & ND6_IFF_IFDISABLED))
{
/*
* If the interface is marked as ND6_IFF_IFDISABLED and
* has a link-local address with IN6_IFF_DUPLICATED,
* do not clear ND6_IFF_IFDISABLED.
* See RFC 4862, section 5.4.5.
*/
int duplicated_linklocal = 0;
s = pserialize_read_enter();
IFADDR_READER_FOREACH(ifa, ifp) {
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;
}
}
pserialize_read_exit(s);
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)) {
int bound = curlwp_bind();
/* Mark all IPv6 addresses as tentative. */
ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
s = pserialize_read_enter();
IFADDR_READER_FOREACH(ifa, ifp) {
struct psref psref;
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
ifa_acquire(ifa, &psref);
pserialize_read_exit(s);
nd6_dad_stop(ifa);
ia = (struct in6_ifaddr *)ifa;
ia->ia6_flags |= IN6_IFF_TENTATIVE;
s = pserialize_read_enter();
ifa_release(ifa, &psref);
}
pserialize_read_exit(s);
curlwp_bindx(bound);
}
if (ND.flags & ND6_IFF_AUTO_LINKLOCAL) {
if (!(ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL)) {
/* auto_linklocal 0->1 transition */
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;
s = pserialize_read_enter();
IFADDR_READER_FOREACH(ifa, ifp) {
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;
}
}
pserialize_read_exit(s);
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 */
ND6_WLOCK();
nd6_defrouter_reset();
nd6_defrouter_select();
ND6_UNLOCK();
break;
case SIOCSPFXFLUSH_IN6:
{
/* flush all the prefix advertised by routers */
struct nd_prefix *pfx, *next;
restart:
ND6_WLOCK();
ND_PREFIX_LIST_FOREACH_SAFE(pfx, next) {
struct in6_ifaddr *ia, *ia_next;
int _s;
if (IN6_IS_ADDR_LINKLOCAL(&pfx->ndpr_prefix.sin6_addr))
continue; /* XXX */
/* do we really have to remove addresses as well? */
_s = pserialize_read_enter();
for (ia = IN6_ADDRLIST_READER_FIRST(); ia;
ia = ia_next) {
struct ifnet *ifa_ifp;
int bound;
struct psref psref;
/* ia might be removed. keep the next ptr. */
ia_next = IN6_ADDRLIST_READER_NEXT(ia);
if ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0)
continue;
if (ia->ia6_ndpr != pfx)
continue;
bound = curlwp_bind();
ia6_acquire(ia, &psref);
pserialize_read_exit(_s);
ND6_UNLOCK();
ifa_ifp = ia->ia_ifa.ifa_ifp;
if (ifa_ifp == ifp) {
/* Already have IFNET_LOCK(ifp) */
KASSERT(!if_is_deactivated(ifp));
ia6_release(ia, &psref);
in6_purgeaddr(&ia->ia_ifa);
curlwp_bindx(bound);
goto restart;
}
IFNET_LOCK(ifa_ifp);
/*
* Need to take the lock first to prevent
* if_detach from running in6_purgeaddr
* concurrently.
*/
if (!if_is_deactivated(ifa_ifp)) {
ia6_release(ia, &psref);
in6_purgeaddr(&ia->ia_ifa);
} else {
/*
* ifp is being destroyed, ia will be
* destroyed by if_detach.
*/
ia6_release(ia, &psref);
/* XXX may cause busy loop */
}
IFNET_UNLOCK(ifa_ifp);
curlwp_bindx(bound);
goto restart;
}
pserialize_read_exit(_s);
KASSERT(pfx->ndpr_refcnt == 0);
nd6_prelist_remove(pfx);
}
ND6_UNLOCK();
break;
}
case SIOCSRTRFLUSH_IN6:
{
/* flush all the default routers */
struct nd_defrouter *drtr, *next;
ND6_WLOCK();
nd6_defrouter_reset();
ND_DEFROUTER_LIST_FOREACH_SAFE(drtr, next) {
nd6_defrtrlist_del(drtr, NULL);
}
nd6_defrouter_select();
ND6_UNLOCK();
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;
ln = nd6_lookup(&nb_addr, ifp, false);
if (ln == NULL) {
error = EINVAL;
break;
}
nbi->state = ln->ln_state;
nbi->asked = ln->ln_asked;
nbi->isrouter = ln->ln_router;
nbi->expire = ln->ln_expire ?
time_mono_to_wall(ln->ln_expire) : 0;
LLE_RUNLOCK(ln);
break;
}
case SIOCGDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
ndif->ifindex = nd6_defifindex;
break;
case SIOCSDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
return nd6_setdefaultiface(ndif->ifindex);
}
return error;
}
void
nd6_llinfo_release_pkts(struct llentry *ln, struct ifnet *ifp)
{
struct mbuf *m_hold, *m_hold_next;
struct sockaddr_in6 sin6;
LLE_WLOCK_ASSERT(ln);
sockaddr_in6_init(&sin6, &ln->r_l3addr.addr6, 0, 0, 0);
m_hold = ln->la_hold, ln->la_hold = NULL, ln->la_numheld = 0;
LLE_WUNLOCK(ln);
for (; m_hold != NULL; 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.
*/
ip6_if_output(ifp, ifp, m_hold, &sin6, NULL);
}
LLE_WLOCK(ln);
}
/*
* Create neighbor cache entry and cache link-layer address,
* on reception of inbound ND6 packets. (RS/RA/NS/redirect)
*/
void
nd6_cache_lladdr(
struct ifnet *ifp,
struct in6_addr *from,
char *lladdr,
int lladdrlen,
int type, /* ICMP6 type */
int code /* type dependent information */
)
{
struct nd_ifinfo *ndi = ND_IFINFO(ifp);
struct llentry *ln = NULL;
int is_newentry;
int do_update;
int olladdr;
int llchange;
int newstate = 0;
uint16_t router = 0;
KASSERT(ifp != NULL);
KASSERT(from != NULL);
/* nothing must be updated for unspecified address */
if (IN6_IS_ADDR_UNSPECIFIED(from))
return;
/*
* 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).
*/
ln = nd6_lookup(from, ifp, true);
if (ln == NULL) {
#if 0
/* nothing must be done if there's no lladdr */
if (!lladdr || !lladdrlen)
return NULL;
#endif
ln = nd6_create(from, ifp);
is_newentry = 1;
} else {
/* do nothing if static ndp is set */
if (ln->la_flags & LLE_STATIC) {
LLE_WUNLOCK(ln);
return;
}
is_newentry = 0;
}
if (ln == NULL)
return;
olladdr = (ln->la_flags & LLE_VALID) ? 1 : 0;
if (olladdr && lladdr) {
llchange = memcmp(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?
*/
memcpy(&ln->ll_addr, lladdr, ifp->if_addrlen);
ln->la_flags |= LLE_VALID;
}
if (!is_newentry) {
if ((!olladdr && lladdr) || /* (3) */
(olladdr && lladdr && 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(ln, nd6_gctimer * hz);
nd6_llinfo_release_pkts(ln, ifp);
} else if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
/* probe right away */
nd6_llinfo_settimer((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 0
/* XXX should we send rtmsg as it used to be? */
if (do_update)
rt_newmsg(RTM_CHANGE, rt); /* tell user process */
#endif
if (ln != NULL) {
router = ln->ln_router;
LLE_WUNLOCK(ln);
}
/*
* If we have too many cache entries, initiate immediate
* purging for some entries.
*/
if (is_newentry)
nd6_gc_neighbors(LLTABLE6(ifp), &ln->r_l3addr.addr6);
/*
* 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, nd6_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 nd6_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 && !ip6_forwarding &&
nd6_accepts_rtadv(ndi)) {
ND6_WLOCK();
nd6_defrouter_select();
ND6_UNLOCK();
}
}
static void
nd6_slowtimo(void *ignored_arg)
{
struct nd_ifinfo *nd6if;
struct ifnet *ifp;
int s;
SOFTNET_KERNEL_LOCK_UNLESS_NET_MPSAFE();
callout_reset(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,
nd6_slowtimo, NULL);
s = pserialize_read_enter();
IFNET_READER_FOREACH(ifp) {
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 = nd6_recalc_reachtm_interval;
nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable);
}
}
pserialize_read_exit(s);
SOFTNET_KERNEL_UNLOCK_UNLESS_NET_MPSAFE();
}
/*
* Return 0 if a neighbor cache is found. Return EWOULDBLOCK if a cache is not
* found and trying to resolve a neighbor; in this case the mbuf is queued in
* the list. Otherwise return errno after freeing the mbuf.
*/
int
nd6_resolve(struct ifnet *ifp, const struct rtentry *rt, struct mbuf *m,
const struct sockaddr *_dst, uint8_t *lldst, size_t dstsize)
{
struct llentry *ln = NULL;
bool created = false;
const struct sockaddr_in6 *dst = satocsin6(_dst);
/* 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? */
}
/*
* 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).
*/
/* Look up the neighbor cache for the nexthop */
ln = nd6_lookup(&dst->sin6_addr, ifp, false);
if (ln != NULL && (ln->la_flags & LLE_VALID) != 0) {
KASSERT(ln->ln_state > ND6_LLINFO_INCOMPLETE);
/* Fast path */
memcpy(lldst, &ln->ll_addr, MIN(dstsize, ifp->if_addrlen));
LLE_RUNLOCK(ln);
return 0;
}
if (ln != NULL)
LLE_RUNLOCK(ln);
/* Slow path */
ln = nd6_lookup(&dst->sin6_addr, ifp, true);
if (ln == NULL && nd6_is_addr_neighbor(dst, ifp)) {
struct sockaddr_in6 sin6;
/*
* 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.
*/
ln = nd6_create(&dst->sin6_addr, ifp);
if (ln == NULL) {
char ip6buf[INET6_ADDRSTRLEN];
log(LOG_DEBUG,
"%s: can't allocate llinfo for %s "
"(ln=%p, rt=%p)\n", __func__,
IN6_PRINT(ip6buf, &dst->sin6_addr), ln, rt);
m_freem(m);
return ENOBUFS;
}
sockaddr_in6_init(&sin6, &ln->r_l3addr.addr6, 0, 0, 0);
rt_clonedmsg(sin6tosa(&sin6), ifp, rt);
created = true;
}
if (ln == NULL) {
m_freem(m);
return ENETDOWN; /* better error? */
}
LLE_WLOCK_ASSERT(ln);
/* We don't have to do link-layer address resolution on a p2p link. */
if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
ln->ln_state < ND6_LLINFO_REACHABLE) {
ln->ln_state = ND6_LLINFO_STALE;
nd6_llinfo_settimer(ln, 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 (ln->ln_state == ND6_LLINFO_STALE) {
ln->ln_asked = 0;
ln->ln_state = ND6_LLINFO_DELAY;
nd6_llinfo_settimer(ln, nd6_delay * hz);
}
/*
* 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 (ln->ln_state == ND6_LLINFO_NOSTATE)
ln->ln_state = ND6_LLINFO_INCOMPLETE;
if (ln->ln_hold) {
struct mbuf *m_hold;
int i;
i = 0;
for (m_hold = ln->ln_hold; m_hold; m_hold = m_hold->m_nextpkt) {
i++;
if (m_hold->m_nextpkt == NULL) {
m_hold->m_nextpkt = m;
break;
}
}
while (i >= nd6_maxqueuelen) {
m_hold = ln->ln_hold;
ln->ln_hold = ln->ln_hold->m_nextpkt;
m_freem(m_hold);
i--;
}
} else {
ln->ln_hold = m;
}
/*
* If there has been no NS for the neighbor after entering the
* INCOMPLETE state, send the first solicitation.
*/
if (!ND6_LLINFO_PERMANENT(ln) && ln->ln_asked == 0) {
struct in6_addr src, *psrc;
ln->ln_asked++;
nd6_llinfo_settimer(ln, ND_IFINFO(ifp)->retrans * hz / 1000);
psrc = nd6_llinfo_get_holdsrc(ln, &src);
LLE_WUNLOCK(ln);
ln = NULL;
nd6_ns_output(ifp, NULL, &dst->sin6_addr, psrc, NULL);
} else {
/* We did the lookup so we need to do the unlock here. */
LLE_WUNLOCK(ln);
}
if (created)
nd6_gc_neighbors(LLTABLE6(ifp), &dst->sin6_addr);
return EWOULDBLOCK;
}
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:
case IFT_CARP:
case IFT_GIF: /* XXX need more cases? */
case IFT_PPP:
case IFT_TUNNEL:
return 1;
default:
return 0;
}
}
static void
clear_llinfo_pqueue(struct llentry *ln)
{
struct mbuf *m_hold, *m_hold_next;
for (m_hold = ln->ln_hold; m_hold; m_hold = m_hold_next) {
m_hold_next = m_hold->m_nextpkt;
m_hold->m_nextpkt = NULL;
m_freem(m_hold);
}
ln->ln_hold = NULL;
return;
}
int
nd6_sysctl(
int name,
void *oldp, /* syscall arg, need copyout */
size_t *oldlenp,
void *newp, /* syscall arg, need copyin */
size_t newlen
)
{
int (*fill_func)(void *, size_t *);
if (newp)
return EPERM;
switch (name) {
case ICMPV6CTL_ND6_DRLIST:
fill_func = fill_drlist;
break;
case ICMPV6CTL_ND6_PRLIST:
fill_func = fill_prlist;
break;
case ICMPV6CTL_ND6_MAXQLEN:
return 0;
default:
return ENOPROTOOPT;
}
if (oldlenp == NULL)
return EINVAL;
size_t ol;
int error = (*fill_func)(NULL, &ol); /* calc len needed */
if (error)
return error;
if (oldp == NULL) {
*oldlenp = ol;
return 0;
}
ol = *oldlenp = min(ol, *oldlenp);
if (ol == 0)
return 0;
void *p = kmem_alloc(ol, KM_SLEEP);
error = (*fill_func)(p, oldlenp);
if (!error)
error = copyout(p, oldp, *oldlenp);
kmem_free(p, ol);
return error;
}
static int
fill_drlist(void *oldp, size_t *oldlenp)
{
int error = 0;
struct in6_defrouter *d = NULL, *de = NULL;
struct nd_defrouter *dr;
size_t l;
if (oldp) {
d = (struct in6_defrouter *)oldp;
de = (struct in6_defrouter *)((char *)oldp + *oldlenp);
}
l = 0;
ND6_RLOCK();
ND_DEFROUTER_LIST_FOREACH(dr) {
if (oldp && d + 1 <= de) {
memset(d, 0, sizeof(*d));
sockaddr_in6_init(&d->rtaddr, &dr->rtaddr, 0, 0, 0);
if (sa6_recoverscope(&d->rtaddr)) {
char ip6buf[INET6_ADDRSTRLEN];
log(LOG_ERR,
"scope error in router list (%s)\n",
IN6_PRINT(ip6buf, &d->rtaddr.sin6_addr));
/* XXX: press on... */
}
d->flags = dr->flags;
d->rtlifetime = dr->rtlifetime;
d->expire = dr->expire ?
time_mono_to_wall(dr->expire) : 0;
d->if_index = dr->ifp->if_index;
}
l += sizeof(*d);
if (d)
d++;
}
ND6_UNLOCK();
*oldlenp = l; /* (void *)d - (void *)oldp */
return error;
}
static int
fill_prlist(void *oldp, size_t *oldlenp)
{
int error = 0;
struct nd_prefix *pr;
uint8_t *p = NULL, *ps = NULL;
uint8_t *pe = NULL;
size_t l;
char ip6buf[INET6_ADDRSTRLEN];
if (oldp) {
ps = p = (uint8_t*)oldp;
pe = (uint8_t*)oldp + *oldlenp;
}
l = 0;
ND6_RLOCK();
ND_PREFIX_LIST_FOREACH(pr) {
u_short advrtrs;
struct sockaddr_in6 sin6;
struct nd_pfxrouter *pfr;
struct in6_prefix pfx;
if (oldp && p + sizeof(struct in6_prefix) <= pe)
{
memset(&pfx, 0, sizeof(pfx));
ps = p;
pfx.prefix = pr->ndpr_prefix;
if (sa6_recoverscope(&pfx.prefix)) {
log(LOG_ERR,
"scope error in prefix list (%s)\n",
IN6_PRINT(ip6buf, &pfx.prefix.sin6_addr));
/* XXX: press on... */
}
pfx.raflags = pr->ndpr_raf;
pfx.prefixlen = pr->ndpr_plen;
pfx.vltime = pr->ndpr_vltime;
pfx.pltime = pr->ndpr_pltime;
pfx.if_index = pr->ndpr_ifp->if_index;
if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME)
pfx.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) {
pfx.expire = pr->ndpr_lastupdate +
pr->ndpr_vltime;
} else
pfx.expire = maxexpire;
}
pfx.refcnt = pr->ndpr_refcnt;
pfx.flags = pr->ndpr_stateflags;
pfx.origin = PR_ORIG_RA;
p += sizeof(pfx); l += sizeof(pfx);
advrtrs = 0;
LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) {
if (p + sizeof(sin6) > pe) {
advrtrs++;
continue;
}
sockaddr_in6_init(&sin6, &pfr->router->rtaddr,
0, 0, 0);
if (sa6_recoverscope(&sin6)) {
log(LOG_ERR,
"scope error in "
"prefix list (%s)\n",
IN6_PRINT(ip6buf,
&pfr->router->rtaddr));
}
advrtrs++;
memcpy(p, &sin6, sizeof(sin6));
p += sizeof(sin6);
l += sizeof(sin6);
}
pfx.advrtrs = advrtrs;
memcpy(ps, &pfx, sizeof(pfx));
}
else {
l += sizeof(pfx);
advrtrs = 0;
LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) {
advrtrs++;
l += sizeof(sin6);
}
}
}
ND6_UNLOCK();
*oldlenp = l;
return error;
}
static int
nd6_setdefaultiface(int ifindex)
{
ifnet_t *ifp;
int error = 0;
int s;
s = pserialize_read_enter();
ifp = if_byindex(ifindex);
if (ifp == NULL) {
pserialize_read_exit(s);
return EINVAL;
}
if (nd6_defifindex != ifindex) {
nd6_defifindex = ifindex;
nd6_defifp = nd6_defifindex > 0 ? ifp : NULL;
/*
* Our current implementation assumes one-to-one maping between
* interfaces and links, so it would be natural to use the
* default interface as the default link.
*/
scope6_setdefault(nd6_defifp);
}
pserialize_read_exit(s);
return (error);
}
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