/*
- * Copyright (c) 2000-2012 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2016 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
+ *
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
- *
+ *
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
- *
+ *
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
- *
+ *
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
-/* $FreeBSD: src/sys/netinet6/nd6_nbr.c,v 1.4.2.4 2001/07/06 05:32:25 sumikawa Exp $ */
-/* $KAME: nd6_nbr.c,v 1.64 2001/05/17 03:48:30 itojun Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
#include <sys/mcache.h>
#include <sys/protosw.h>
#include <kern/queue.h>
+#include <dev/random/randomdev.h>
#include <kern/locks.h>
#include <kern/zalloc.h>
#include <net/if_dl.h>
#include <net/if_llreach.h>
#include <net/route.h>
+#include <net/dlil.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet6/in6_var.h>
+#include <netinet6/in6_ifattach.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/nd6.h>
#if INET6
#include <netinet6/ipsec6.h>
#endif
-extern int ipsec_bypass;
#endif
-#include <net/net_osdep.h>
-
struct dadq;
-static struct dadq *nd6_dad_find(struct ifaddr *);
+static struct dadq *nd6_dad_find(struct ifaddr *, struct nd_opt_nonce *);
void nd6_dad_stoptimer(struct ifaddr *);
static void nd6_dad_timer(struct ifaddr *);
static void nd6_dad_ns_output(struct dadq *, struct ifaddr *);
-static void nd6_dad_ns_input(struct ifaddr *);
-static void nd6_dad_na_input(struct ifaddr *, caddr_t, int);
+static void nd6_dad_ns_input(struct ifaddr *, char *, int, struct nd_opt_nonce *);
+static struct mbuf *nd6_dad_na_input(struct mbuf *, struct ifnet *,
+ struct in6_addr *, caddr_t, int);
static void dad_addref(struct dadq *, int);
static void dad_remref(struct dadq *);
static struct dadq *nd6_dad_attach(struct dadq *, struct ifaddr *);
static void nd6_dad_detach(struct dadq *, struct ifaddr *);
-static int dad_ignore_ns = 0; /* ignore NS in DAD - specwise incorrect*/
static int dad_maxtry = 15; /* max # of *tries* to transmit DAD packet */
static unsigned int dad_size; /* size of zone element */
extern lck_mtx_t *dad6_mutex;
extern lck_mtx_t *nd6_mutex;
-extern int in6_get_hw_ifid(struct ifnet *, struct in6_addr *);
-static int nd6_llreach_base = (LL_BASE_REACHABLE / 1000); /* seconds */
+static int nd6_llreach_base = 30; /* seconds */
static struct sockaddr_in6 hostrtmask;
SYSCTL_DECL(_net_inet6_icmp6);
-
SYSCTL_INT(_net_inet6_icmp6, OID_AUTO, nd6_llreach_base,
- CTLFLAG_RW | CTLFLAG_LOCKED, &nd6_llreach_base, LL_BASE_REACHABLE,
+ CTLFLAG_RW | CTLFLAG_LOCKED, &nd6_llreach_base, 0,
"default ND6 link-layer reachability max lifetime (in seconds)");
+int dad_enhanced = 1;
+SYSCTL_DECL(_net_inet6_ip6);
+SYSCTL_INT(_net_inet6_ip6, OID_AUTO, dad_enhanced, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &dad_enhanced, 0,
+ "Enable Enhanced DAD, which adds a random nonce to NS messages for DAD.");
+
/*
* Obtain a link-layer source cache entry for the sender.
*
struct llinfo_nd6 *ln = rt->rt_llinfo;
if (nd6_llreach_base != 0 &&
- ln->ln_expire != 0 && rt->rt_ifp != lo_ifp &&
+ (ln->ln_expire != 0 || (ifp->if_eflags & IFEF_IPV6_ND6ALT) != 0) &&
+ !(rt->rt_ifp->if_flags & IFF_LOOPBACK) &&
ifp->if_addrlen == IF_LLREACH_MAXLEN && /* Ethernet */
alen == ifp->if_addrlen) {
struct if_llreach *lr;
if (nd6_debug && lr != NULL && why != NULL) {
char tmp[MAX_IPv6_STR_LEN];
- nd6log((LOG_DEBUG, "%s%d: %s%s for %s\n", ifp->if_name,
- ifp->if_unit, type, why, inet_ntop(AF_INET6,
+ nd6log((LOG_DEBUG, "%s: %s%s for %s\n", if_name(ifp),
+ type, why, inet_ntop(AF_INET6,
&SIN6(rt_key(rt))->sin6_addr, tmp, sizeof (tmp))));
}
}
/*
* Input a Neighbor Solicitation Message.
*
- * Based on RFC 2461
- * Based on RFC 2462 (duplicate address detection)
+ * Based on RFC 4861
+ * Based on RFC 4862 (duplicate address detection)
*/
void
nd6_ns_input(
union nd_opts ndopts;
struct sockaddr_dl proxydl;
boolean_t advrouter;
+ boolean_t is_dad_probe;
+ int oflgclr = 0;
+
+ if ((ifp->if_eflags & IFEF_IPV6_ND6ALT) != 0) {
+ nd6log((LOG_INFO, "nd6_ns_input: on ND6ALT interface!\n"));
+ return;
+ }
/* Expect 32-bit aligned data pointer on strict-align platforms */
MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
-#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, off, icmp6len, return);
nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off);
-#else
- IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len);
- if (nd_ns == NULL) {
- icmp6stat.icp6s_tooshort++;
- return;
- }
-#endif
+ m->m_pkthdr.pkt_flags |= PKTF_INET6_RESOLVE;
+
ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */
taddr6 = nd_ns->nd_ns_target;
if (in6_setscope(&taddr6, ifp, NULL) != 0)
goto bad;
}
- if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
+ is_dad_probe = IN6_IS_ADDR_UNSPECIFIED(&saddr6);
+ if (is_dad_probe) {
/* dst has to be a solicited node multicast address. */
if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL &&
/* don't check ifindex portion */
lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
}
- if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) {
+ if (is_dad_probe && lladdr) {
nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
"(link-layer address option)\n"));
goto bad;
*/
if (ip6_forwarding && nd6_prproxy)
nd6_prproxy_ns_input(ifp, &saddr6, lladdr,
- lladdrlen, &daddr6, &taddr6);
+ lladdrlen, &daddr6, &taddr6,
+ (ndopts.nd_opts_nonce == NULL) ? NULL :
+ ndopts.nd_opts_nonce->nd_opt_nonce);
goto freeit;
}
IFA_LOCK(ifa);
* src addr how to process?
* --- ---
* multicast of course, invalid (rejected in ip6_input)
- * unicast somebody is doing address resolution -> ignore
+ * unicast somebody is doing address resolution
* unspec dup address detection
*
- * The processing is defined in RFC 2462 (and updated by RFC 4429)
+ * The processing is defined in the "draft standard" RFC 4862 (and by
+ * RFC 4429, which is a "proposed standard" update to its obsolete
+ * predecessor, RFC 2462) The reason optimistic DAD is not included
+ * in RFC 4862 is entirely due to IETF procedural considerations.
*/
if (dadprogress) {
/*
* duplicate address detection.
*
* If not, the packet is for addess resolution;
- * silently ignore it.
+ * silently ignore it when not optimistic
+ *
+ * Per RFC 4429 the reply for an optimistic address must
+ * have the Override flag cleared
*/
- if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
- nd6_dad_ns_input(ifa);
+ if (!is_dad_probe && (dadprogress & IN6_IFF_OPTIMISTIC) != 0) {
+ oflgclr = 1;
+ } else {
+ if (is_dad_probe)
+ nd6_dad_ns_input(ifa, lladdr, lladdrlen, ndopts.nd_opts_nonce);
- goto freeit;
+ goto freeit;
+ }
}
/* Are we an advertising router on this interface? */
* the address.
* S bit ("solicited") must be zero.
*/
- if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
+ if (is_dad_probe) {
saddr6 = in6addr_linklocal_allnodes;
if (in6_setscope(&saddr6, ifp, NULL) != 0)
goto bad;
ND_NEIGHBOR_SOLICIT, 0);
nd6_na_output(ifp, &saddr6, &taddr6,
- ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
+ ((anycast || proxy || !tlladdr || oflgclr) ? 0 : ND_NA_FLAG_OVERRIDE) |
(advrouter ? ND_NA_FLAG_ROUTER : 0) | ND_NA_FLAG_SOLICITED,
tlladdr, proxy ? (struct sockaddr *)&proxydl : NULL);
freeit:
* - ND6 header target IP6 address
* - ND6 header source datalink address
*
- * Based on RFC 2461
- * Based on RFC 2462 (duplicate address detection)
- * Updated by RFC 4429 (optimistic duplicate address detection)
+ * Based on RFC 4861
+ * Based on RFC 4862 (duplicate address detection)
+ * Based on RFC 4429 (optimistic duplicate address detection)
*
* Caller must bump up ln->ln_rt refcnt to make sure 'ln' doesn't go
* away if there is a llinfo_nd6 passed in.
const struct in6_addr *daddr6,
const struct in6_addr *taddr6,
struct llinfo_nd6 *ln, /* for source address determination */
- int dad) /* duplicated address detection */
+ uint8_t *nonce) /* duplicated address detection */
{
struct mbuf *m;
struct ip6_hdr *ip6;
int flags;
caddr_t mac;
struct route_in6 ro;
- struct ip6_out_args ip6oa =
- { IFSCOPE_NONE, { 0 }, IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR };
+ struct ip6_out_args ip6oa = { IFSCOPE_NONE, { 0 },
+ IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR |
+ IP6OAF_AWDL_UNRESTRICTED | IP6OAF_INTCOPROC_ALLOWED, 0,
+ SO_TC_UNSPEC, _NET_SERVICE_TYPE_UNSPEC };
u_int32_t rtflags = 0;
if ((ifp->if_eflags & IFEF_IPV6_ND6ALT) || IN6_IS_ADDR_MULTICAST(taddr6))
if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
goto bad;
}
- if (!dad) {
+ if (nonce == NULL) {
/*
* RFC2461 7.2.2:
* "If the source address of the packet prompting the
rtflags = ln->ln_rt->rt_flags;
RT_UNLOCK(ln->ln_rt);
}
- if (ia != NULL) {
- IFA_REMREF(&ia->ia_ifa);
- ia = NULL;
- }
if (hsrc != NULL && (ia = in6ifa_ifpwithaddr(ifp, hsrc)) &&
(ia->ia6_flags & IN6_IFF_OPTIMISTIC) == 0) {
src = hsrc;
goto bad;
}
+ if (ia != NULL) {
+ IFA_REMREF(&ia->ia_ifa);
+ ia = NULL;
+ }
+ /*
+ * RFC 4429 section 3.2:
+ * When a node has a unicast packet to send
+ * from an Optimistic Address to a neighbor,
+ * but does not know the neighbor's link-layer
+ * address, it MUST NOT perform Address
+ * Resolution.
+ */
ia = in6ifa_ifpwithaddr(ifp, src);
if (!ia || (ia->ia6_flags & IN6_IFF_OPTIMISTIC)) {
nd6log((LOG_DEBUG,
* Multicast NS MUST add one add the option
* Unicast NS SHOULD add one add the option
*/
- if (!dad && (mac = nd6_ifptomac(ifp))) {
+ if (nonce == NULL && (mac = nd6_ifptomac(ifp))) {
int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
/* 8 byte alignments... */
nd_opt->nd_opt_len = optlen >> 3;
bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
}
+ /*
+ * Add a Nonce option (RFC 3971) to detect looped back NS messages.
+ * This behavior is documented as Enhanced Duplicate Address
+ * Detection in draft-ietf-6man-enhanced-dad-13.
+ * net.inet6.ip6.dad_enhanced=0 disables this.
+ */
+ if (dad_enhanced != 0 && nonce != NULL && !(ifp->if_flags & IFF_POINTOPOINT)) {
+ int optlen = sizeof(struct nd_opt_hdr) + ND_OPT_NONCE_LEN;
+ struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
+ /* 8-byte alignment is required. */
+ optlen = (optlen + 7) & ~7;
+ m->m_pkthdr.len += optlen;
+ m->m_len += optlen;
+ icmp6len += optlen;
+ bzero((caddr_t)nd_opt, optlen);
+ nd_opt->nd_opt_type = ND_OPT_NONCE;
+ nd_opt->nd_opt_len = optlen >> 3;
+ bcopy(nonce, (caddr_t)(nd_opt + 1), ND_OPT_NONCE_LEN);
+ }
ip6->ip6_plen = htons((u_short)icmp6len);
nd_ns->nd_ns_cksum = 0;
nd_ns->nd_ns_cksum
= in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
-#if IPSEC
- /* Don't lookup socket */
- if (ipsec_bypass == 0)
- (void)ipsec_setsocket(m, NULL);
-#endif
- flags = dad ? IPV6_UNSPECSRC : 0;
+ flags = nonce ? IPV6_UNSPECSRC : 0;
flags |= IPV6_OUTARGS;
+ /*
+ * PKTF_{INET,INET6}_RESOLVE_RTR are mutually exclusive, so make
+ * sure only one of them is set (just in case.)
+ */
+ m->m_pkthdr.pkt_flags &= ~(PKTF_INET_RESOLVE | PKTF_RESOLVE_RTR);
+ m->m_pkthdr.pkt_flags |= PKTF_INET6_RESOLVE;
/*
* If this is a NS for resolving the (default) router, mark
* the packet accordingly so that the driver can find out,
* in case it needs to perform driver-specific action(s).
*/
- if (rtflags & RTF_ROUTER) {
- m->m_pkthdr.aux_flags |= MAUXF_INET6_RESOLVE_RTR;
- VERIFY(!(m->m_pkthdr.aux_flags & MAUXF_INET_RESOLVE_RTR));
- }
+ if (rtflags & RTF_ROUTER)
+ m->m_pkthdr.pkt_flags |= PKTF_RESOLVE_RTR;
if (ifp->if_eflags & IFEF_TXSTART) {
- /* Use control service class if the interface
+ /*
+ * Use control service class if the interface
* supports transmit-start model
*/
(void) m_set_service_class(m, MBUF_SC_CTL);
}
icmp6stat.icp6s_outhist[ND_NEIGHBOR_SOLICIT]++;
+exit:
if (im6o != NULL)
IM6O_REMREF(im6o);
- if (ro.ro_rt) { /* we don't cache this route. */
- rtfree(ro.ro_rt);
- }
+
+ ROUTE_RELEASE(&ro); /* we don't cache this route. */
+
if (ia != NULL)
IFA_REMREF(&ia->ia_ifa);
return;
bad:
- if (im6o != NULL)
- IM6O_REMREF(im6o);
- if (ro.ro_rt) {
- rtfree(ro.ro_rt);
- }
m_freem(m);
- if (ia != NULL)
- IFA_REMREF(&ia->ia_ifa);
- return;
+ goto exit;
}
/*
* Neighbor advertisement input handling.
*
- * Based on RFC 2461
- * Based on RFC 2462 (duplicate address detection)
+ * Based on RFC 4861
+ * Based on RFC 4862 (duplicate address detection)
*
* the following items are not implemented yet:
- * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
- * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
+ * - anycast advertisement delay rule (RFC 4861 7.2.7, SHOULD)
+ * - proxy advertisement delay rule (RFC 4861 7.2.8, last paragraph, "should")
*/
void
-nd6_na_input(
- struct mbuf *m,
- int off,
- int icmp6len)
+nd6_na_input(struct mbuf *m, int off, int icmp6len)
{
struct ifnet *ifp = m->m_pkthdr.rcvif;
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
int is_override;
char *lladdr = NULL;
int lladdrlen = 0;
- struct ifaddr *ifa = NULL;
struct llinfo_nd6 *ln;
struct rtentry *rt;
struct sockaddr_dl *sdl;
union nd_opts ndopts;
- struct timeval timenow;
+ uint64_t timenow;
+ bool send_nc_alive_kev = false;
+
+ if ((ifp->if_eflags & IFEF_IPV6_ND6ALT) != 0) {
+ nd6log((LOG_INFO, "nd6_na_input: on ND6ALT interface!\n"));
+ return;
+ }
/* Expect 32-bit aligned data pointer on strict-align platforms */
MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
goto bad;
}
-#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, off, icmp6len, return);
nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
-#else
- IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len);
- if (nd_na == NULL) {
- icmp6stat.icp6s_tooshort++;
- return;
- }
-#endif
+ m->m_pkthdr.pkt_flags |= PKTF_INET6_RESOLVE;
flags = nd_na->nd_na_flags_reserved;
is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
if (ndopts.nd_opts_tgt_lladdr) {
lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
- }
-
- ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
-
- /*
- * Target address matches one of my interface address.
- *
- * If my address is tentative or optimistic, this means that there's
- * somebody already using the same address as mine. This indicates DAD
- * failure. This is defined in RFC 2462 and updated by RFC 4429.
- *
- * Otherwise, process as defined in RFC 2461.
- */
- if (ifa != NULL) {
- IFA_LOCK(ifa);
- if (((struct in6_ifaddr *)ifa)->ia6_flags &
- IN6_IFF_DADPROGRESS) {
- struct nd_ifinfo *ndi;
- boolean_t ignorena = FALSE;
- IFA_UNLOCK(ifa);
- lck_rw_lock_shared(nd_if_rwlock);
- ndi = ND_IFINFO(ifp);
- if (ndi != NULL && ndi->initialized) {
- lck_mtx_lock(&ndi->lock);
- ignorena = ndi->flags & ND6_IFF_IGNORE_NA;
- lck_mtx_unlock(&ndi->lock);
- }
- lck_rw_done(nd_if_rwlock);
- if (ignorena)
- log(LOG_ERR, "%s: ignoring duplicate DAD due "
- "to sleep proxy (%s)\n", __func__,
- if_name(ifp));
- else
- nd6_dad_na_input(ifa, lladdr, lladdrlen);
- goto freeit;
+ if (((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
+ nd6log((LOG_INFO,
+ "nd6_na_input: lladdrlen mismatch for %s "
+ "(if %d, NA packet %d)\n",
+ ip6_sprintf(&taddr6), ifp->if_addrlen,
+ lladdrlen - 2));
+ goto bad;
}
- IFA_UNLOCK(ifa);
- }
-
- /* Just for safety, maybe unnecessary. */
- if (ifa) {
- log(LOG_ERR,
- "nd6_na_input: duplicate IP6 address %s\n",
- ip6_sprintf(&taddr6));
- goto freeit;
}
- if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
- nd6log((LOG_INFO,
- "nd6_na_input: lladdrlen mismatch for %s "
- "(if %d, NA packet %d)\n",
- ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2));
- goto bad;
- }
+ m = nd6_dad_na_input(m, ifp, &taddr6, lladdr, lladdrlen);
+ if (m == NULL)
+ return;
/* Forwarding associated with NDPRF_PRPROXY may apply. */
if (ip6_forwarding && nd6_prproxy)
* another interface (in case we are doing prefix proxying.)
*/
if ((rt = nd6_lookup(&taddr6, 0, ifp, 0)) == NULL) {
- if (!ip6_forwarding || !ip6_doscopedroute || !nd6_prproxy)
+ if (!ip6_forwarding || !nd6_prproxy)
goto freeit;
if ((rt = nd6_lookup(&taddr6, 0, NULL, 0)) == NULL)
/* Change the interface when the existing route is on */
rt->rt_ifp = ifp;
+
+ /*
+ * If rmx_mtu is not locked, update it
+ * to the MTU used by the new interface.
+ */
+ if (!(rt->rt_rmx.rmx_locks & RTV_MTU))
+ rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu;
}
}
goto freeit;
}
- getmicrotime(&timenow);
+ timenow = net_uptime();
+
if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
/*
* If the link-layer has address, and no lladdr option came,
sdl->sdl_alen = ifp->if_addrlen;
bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
if (is_solicited) {
- ln->ln_state = ND6_LLINFO_REACHABLE;
- ln->ln_byhint = 0;
- if (ln->ln_expire) {
- struct nd_ifinfo *ndi;
+ send_nc_alive_kev = (rt->rt_flags & RTF_ROUTER) ? true : false;
+ ND6_CACHE_STATE_TRANSITION(ln, ND6_LLINFO_REACHABLE);
+ if (ln->ln_expire != 0) {
+ struct nd_ifinfo *ndi = NULL;
- lck_rw_lock_shared(nd_if_rwlock);
ndi = ND_IFINFO(rt->rt_ifp);
VERIFY(ndi != NULL && ndi->initialized);
lck_mtx_lock(&ndi->lock);
- ln->ln_expire = rt_expiry(rt, timenow.tv_sec,
- ndi->reachable);
+ ln_setexpire(ln, timenow + ndi->reachable);
lck_mtx_unlock(&ndi->lock);
- lck_rw_done(nd_if_rwlock);
+ RT_UNLOCK(rt);
+ lck_mtx_lock(rnh_lock);
+ nd6_sched_timeout(NULL, NULL);
+ lck_mtx_unlock(rnh_lock);
+ RT_LOCK(rt);
}
} else {
- ln->ln_state = ND6_LLINFO_STALE;
- ln->ln_expire = rt_expiry(rt, timenow.tv_sec,
- nd6_gctimer);
+ ND6_CACHE_STATE_TRANSITION(ln, ND6_LLINFO_STALE);
+ ln_setexpire(ln, timenow + nd6_gctimer);
}
if ((ln->ln_router = is_router) != 0) {
/*
* no other updates should be done.
*/
if (ln->ln_state == ND6_LLINFO_REACHABLE) {
- ln->ln_state = ND6_LLINFO_STALE;
- ln->ln_expire = rt_expiry(rt, timenow.tv_sec,
- nd6_gctimer);
+ ND6_CACHE_STATE_TRANSITION(ln, ND6_LLINFO_STALE);
+ ln_setexpire(ln, timenow + nd6_gctimer);
}
RT_REMREF_LOCKED(rt);
RT_UNLOCK(rt);
* changed, make it STALE.
*/
if (is_solicited) {
- ln->ln_state = ND6_LLINFO_REACHABLE;
- ln->ln_byhint = 0;
- if (ln->ln_expire) {
- struct nd_ifinfo *ndi;
+ ND6_CACHE_STATE_TRANSITION(ln, ND6_LLINFO_REACHABLE);
+ if (ln->ln_expire != 0) {
+ struct nd_ifinfo *ndi = NULL;
- lck_rw_lock_shared(nd_if_rwlock);
ndi = ND_IFINFO(ifp);
VERIFY(ndi != NULL && ndi->initialized);
lck_mtx_lock(&ndi->lock);
- ln->ln_expire =
- rt_expiry(rt, timenow.tv_sec,
- ndi->reachable);
+ ln_setexpire(ln,
+ timenow + ndi->reachable);
lck_mtx_unlock(&ndi->lock);
- lck_rw_done(nd_if_rwlock);
+ RT_UNLOCK(rt);
+ lck_mtx_lock(rnh_lock);
+ nd6_sched_timeout(NULL, NULL);
+ lck_mtx_unlock(rnh_lock);
+ RT_LOCK(rt);
}
} else {
if (lladdr && llchange) {
- ln->ln_state = ND6_LLINFO_STALE;
- ln->ln_expire = rt_expiry(rt,
- timenow.tv_sec, nd6_gctimer);
+ ND6_CACHE_STATE_TRANSITION(ln, ND6_LLINFO_STALE);
+ ln_setexpire(ln, timenow + nd6_gctimer);
}
}
}
lck_mtx_lock(nd6_mutex);
dr = defrouter_lookup(in6, rt_ifp);
if (dr) {
+ TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
defrtrlist_del(dr);
+ NDDR_REMREF(dr); /* remove list reference */
NDDR_REMREF(dr);
lck_mtx_unlock(nd6_mutex);
} else {
lck_mtx_unlock(nd6_mutex);
- if (ip6_doscopedroute || !ip6_forwarding) {
- /*
- * Even if the neighbor is not in the
- * default router list, the neighbor
- * may be used as a next hop for some
- * destinations (e.g. redirect case).
- * So we must call rt6_flush explicitly.
- */
- rt6_flush(&ip6->ip6_src, rt_ifp);
- }
+ /*
+ * Even if the neighbor is not in the
+ * default router list, the neighbor
+ * may be used as a next hop for some
+ * destinations (e.g. redirect case).
+ * So we must call rt6_flush explicitly.
+ */
+ rt6_flush(&ip6->ip6_src, rt_ifp);
}
RT_LOCK(rt);
}
ln->ln_router = is_router;
}
+
+ if (send_nc_alive_kev && (ifp->if_addrlen == IF_LLREACH_MAXLEN)) {
+ struct kev_msg ev_msg;
+ struct kev_nd6_ndalive nd6_ndalive;
+ bzero(&ev_msg, sizeof(ev_msg));
+ bzero(&nd6_ndalive, sizeof(nd6_ndalive));
+ ev_msg.vendor_code = KEV_VENDOR_APPLE;
+ ev_msg.kev_class = KEV_NETWORK_CLASS;
+ ev_msg.kev_subclass = KEV_ND6_SUBCLASS;
+ ev_msg.event_code = KEV_ND6_NDALIVE;
+
+ nd6_ndalive.link_data.if_family = ifp->if_family;
+ nd6_ndalive.link_data.if_unit = ifp->if_unit;
+ strlcpy(nd6_ndalive.link_data.if_name,
+ ifp->if_name,
+ sizeof(nd6_ndalive.link_data.if_name));
+ ev_msg.dv[0].data_ptr = &nd6_ndalive;
+ ev_msg.dv[0].data_length =
+ sizeof(nd6_ndalive);
+ dlil_post_complete_msg(NULL, &ev_msg);
+ }
+
RT_LOCK_ASSERT_HELD(rt);
rt->rt_flags &= ~RTF_REJECT;
* prevent a ln_hold lookup in nd6_output()
* (wouldn't happen, though...)
*/
- for (m_hold = ln->ln_hold;
- m_hold; m_hold = m_hold_next) {
+ m_hold = ln->ln_hold;
+ ln->ln_hold = NULL;
+ for ( ; m_hold; m_hold = m_hold_next) {
m_hold_next = m_hold->m_nextpkt;
m_hold->m_nextpkt = NULL;
/*
nd6_output(ifp, ifp, m_hold, &sin6, rt, NULL);
RT_LOCK_SPIN(rt);
}
- ln->ln_hold = NULL;
-
}
RT_REMREF_LOCKED(rt);
RT_UNLOCK(rt);
-freeit:
- m_freem(m);
- if (ifa != NULL)
- IFA_REMREF(ifa);
- return;
-
bad:
icmp6stat.icp6s_badna++;
+ /* fall through */
+
+freeit:
m_freem(m);
- if (ifa != NULL)
- IFA_REMREF(ifa);
}
/*
struct sockaddr_in6 dst_sa;
int icmp6len, maxlen, error;
struct ifnet *outif = NULL;
- struct ip6_out_args ip6oa =
- { IFSCOPE_NONE, { 0 }, IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR };
+ struct ip6_out_args ip6oa = { IFSCOPE_NONE, { 0 },
+ IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR |
+ IP6OAF_AWDL_UNRESTRICTED | IP6OAF_INTCOPROC_ALLOWED, 0,
+ SO_TC_UNSPEC, _NET_SERVICE_TYPE_UNSPEC };
bzero(&ro, sizeof(ro));
nd_na->nd_na_cksum =
in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
-#if IPSEC
- /* Don't lookup socket */
- if (ipsec_bypass == 0)
- (void)ipsec_setsocket(m, NULL);
-#endif
+ m->m_pkthdr.pkt_flags |= PKTF_INET6_RESOLVE;
if (ifp->if_eflags & IFEF_TXSTART) {
/* Use control service class if the interface supports
}
icmp6stat.icp6s_outhist[ND_NEIGHBOR_ADVERT]++;
+exit:
if (im6o != NULL)
IM6O_REMREF(im6o);
- if (ro.ro_rt) {
- rtfree(ro.ro_rt);
- }
+
+ ROUTE_RELEASE(&ro);
return;
bad:
- if (im6o != NULL)
- IM6O_REMREF(im6o);
- if (ro.ro_rt) {
- rtfree(ro.ro_rt);
- }
m_freem(m);
- return;
+ goto exit;
}
caddr_t
#endif
case IFT_BRIDGE:
case IFT_ISO88025:
- return ((caddr_t)ifnet_lladdr(ifp));
+ return ((caddr_t)IF_LLADDR(ifp));
default:
return NULL;
}
int dad_ns_ocount; /* NS sent so far */
int dad_ns_icount;
int dad_na_icount;
- int dad_na_ixcount; /* Count of IFDISABLED eligible NA rx'd */
+ int dad_ns_lcount; /* looped back NS */
+ int dad_loopbackprobe; /* probing state for loopback detection */
+ uint8_t dad_lladdr[ETHER_ADDR_LEN];
+ uint8_t dad_lladdrlen;
+#define ND_OPT_NONCE_LEN32 \
+ ((ND_OPT_NONCE_LEN + sizeof(uint32_t) - 1)/sizeof(uint32_t))
+ uint32_t dad_nonce[ND_OPT_NONCE_LEN32];
};
static struct dadq_head dadq;
nd6_nbr_init(void)
{
int i;
-
+
TAILQ_INIT(&dadq);
dad_size = sizeof (struct dadq);
}
static struct dadq *
-nd6_dad_find(struct ifaddr *ifa)
+nd6_dad_find(struct ifaddr *ifa, struct nd_opt_nonce *nonce)
{
struct dadq *dp;
lck_mtx_lock(dad6_mutex);
for (dp = dadq.tqh_first; dp; dp = dp->dad_list.tqe_next) {
DAD_LOCK_SPIN(dp);
- if (dp->dad_ifa == ifa) {
- DAD_ADDREF_LOCKED(dp);
+ if (dp->dad_ifa != ifa) {
DAD_UNLOCK(dp);
- lck_mtx_unlock(dad6_mutex);
- return (dp);
+ continue;
}
+
+ /*
+ * Skip if the nonce matches the received one.
+ * +2 in the length is required because of type and
+ * length fields are included in a header.
+ */
+ if (nonce != NULL &&
+ nonce->nd_opt_nonce_len == (ND_OPT_NONCE_LEN + 2) / 8 &&
+ memcmp(&nonce->nd_opt_nonce[0], &dp->dad_nonce[0],
+ ND_OPT_NONCE_LEN) == 0) {
+ nd6log((LOG_ERR, "%s: a looped back NS message is "
+ "detected during DAD for %s. Ignoring.\n",
+ if_name(ifa->ifa_ifp),
+ ip6_sprintf(IFA_IN6(ifa))));
+ dp->dad_ns_lcount++;
+ ++ip6stat.ip6s_dad_loopcount;
+ DAD_UNLOCK(dp);
+ continue;
+ }
+
+ DAD_ADDREF_LOCKED(dp);
DAD_UNLOCK(dp);
+ break;
}
lck_mtx_unlock(dad6_mutex);
- return (NULL);
+ return (dp);
}
void
struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
struct dadq *dp;
+ nd6log2((LOG_DEBUG, "%s - %s ifp %s ia6_flags 0x%x\n",
+ __func__,
+ ip6_sprintf(&ia->ia_addr.sin6_addr),
+ if_name(ia->ia_ifp),
+ ia->ia6_flags));
+
/*
* If we don't need DAD, don't do it.
* There are several cases:
(ifa->ifa_ifp->if_eflags & IFEF_IPV6_ND6ALT)) {
return;
}
- if ((dp = nd6_dad_find(ifa)) != NULL) {
+ if ((dp = nd6_dad_find(ifa, NULL)) != NULL) {
DAD_REMREF(dp);
/* DAD already in progress */
return;
/* Callee adds one reference for us */
dp = nd6_dad_attach(dp, ifa);
- nd6log((LOG_DEBUG, "%s: starting %sDAD for %s\n",
+ nd6log((LOG_DEBUG, "%s: starting %sDAD %sfor %s\n",
if_name(ifa->ifa_ifp),
- (ia->ia_flags & IN6_IFF_OPTIMISTIC) ? "optimistic " : "",
+ (ia->ia6_flags & IN6_IFF_OPTIMISTIC) ? "optimistic " : "",
+ (tick_delay == NULL) ? "immediately " : "",
ip6_sprintf(&ia->ia_addr.sin6_addr)));
/*
*/
if (tick_delay == NULL) {
u_int32_t retrans;
- struct nd_ifinfo *ndi;
+ struct nd_ifinfo *ndi = NULL;
nd6_dad_ns_output(dp, ifa);
- lck_rw_lock_shared(nd_if_rwlock);
ndi = ND_IFINFO(ifa->ifa_ifp);
VERIFY(ndi != NULL && ndi->initialized);
lck_mtx_lock(&ndi->lock);
retrans = ndi->retrans * hz / 1000;
lck_mtx_unlock(&ndi->lock);
- lck_rw_done(nd_if_rwlock);
timeout((void (*)(void *))nd6_dad_timer, (void *)ifa, retrans);
} else {
int ntick;
dp->dad_count = ip6_dad_count;
dp->dad_ns_icount = dp->dad_na_icount = 0;
dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
- dp->dad_na_ixcount = 0;
+ dp->dad_ns_lcount = dp->dad_loopbackprobe = 0;
VERIFY(!dp->dad_attached);
dp->dad_attached = 1;
+ dp->dad_lladdrlen = 0;
DAD_ADDREF_LOCKED(dp); /* for caller */
DAD_ADDREF_LOCKED(dp); /* for dadq_head list */
TAILQ_INSERT_TAIL(&dadq, (struct dadq *)dp, dad_list);
{
struct dadq *dp;
- dp = nd6_dad_find(ifa);
+ dp = nd6_dad_find(ifa, NULL);
if (!dp) {
/* DAD wasn't started yet */
return;
DAD_REMREF(dp); /* drop our reference */
}
-
static void
nd6_unsol_na_output(struct ifaddr *ifa)
{
{
struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
struct dadq *dp = NULL;
+ struct nd_ifinfo *ndi = NULL;
+ u_int32_t retrans;
/* Sanity check */
if (ia == NULL) {
log(LOG_ERR, "nd6_dad_timer: called with null parameter\n");
goto done;
}
- dp = nd6_dad_find(ifa);
+
+ nd6log2((LOG_DEBUG, "%s - %s ifp %s ia6_flags 0x%x\n",
+ __func__,
+ ip6_sprintf(&ia->ia_addr.sin6_addr),
+ if_name(ia->ia_ifp),
+ ia->ia6_flags));
+
+ dp = nd6_dad_find(ifa, NULL);
if (dp == NULL) {
log(LOG_ERR, "nd6_dad_timer: DAD structure not found\n");
goto done;
/* Need more checks? */
if (dp->dad_ns_ocount < dp->dad_count) {
- u_int32_t retrans;
- struct nd_ifinfo *ndi;
-
DAD_UNLOCK(dp);
/*
* We have more NS to go. Send NS packet for DAD.
*/
nd6_dad_ns_output(dp, ifa);
- lck_rw_lock_shared(nd_if_rwlock);
ndi = ND_IFINFO(ifa->ifa_ifp);
VERIFY(ndi != NULL && ndi->initialized);
lck_mtx_lock(&ndi->lock);
retrans = ndi->retrans * hz / 1000;
lck_mtx_unlock(&ndi->lock);
- lck_rw_done(nd_if_rwlock);
timeout((void (*)(void *))nd6_dad_timer, (void *)ifa, retrans);
} else {
/*
* We have transmitted sufficient number of DAD packets.
* See what we've got.
*/
- int duplicate;
-
- duplicate = 0;
+ if (dp->dad_na_icount > 0 || dp->dad_ns_icount) {
+ /* We've seen NS or NA, means DAD has failed. */
+ DAD_UNLOCK(dp);
+ nd6log((LOG_INFO,
+ "%s: duplicate IPv6 address %s [timer]\n",
+ __func__, ip6_sprintf(&ia->ia_addr.sin6_addr),
+ if_name(ia->ia_ifp)));
+ nd6_dad_duplicated(ifa);
+ /* (*dp) will be freed in nd6_dad_duplicated() */
+ } else if (dad_enhanced != 0 &&
+ dp->dad_ns_lcount > 0 &&
+ dp->dad_ns_lcount > dp->dad_loopbackprobe) {
+ dp->dad_loopbackprobe = dp->dad_ns_lcount;
+ dp->dad_count =
+ dp->dad_ns_ocount + dad_maxtry - 1;
+ DAD_UNLOCK(dp);
+ ndi = ND_IFINFO(ifa->ifa_ifp);
+ VERIFY(ndi != NULL && ndi->initialized);
+ lck_mtx_lock(&ndi->lock);
+ retrans = ndi->retrans * hz / 1000;
+ lck_mtx_unlock(&ndi->lock);
- if (dp->dad_na_icount) {
/*
- * the check is in nd6_dad_na_input(),
- * but just in case
+ * Sec. 4.1 in RFC 7527 requires transmission of
+ * additional probes until the loopback condition
+ * becomes clear when a looped back probe is detected.
+ */
+ nd6log((LOG_INFO,
+ "%s: a looped back NS message is "
+ "detected during DAD for %s. "
+ "Another DAD probe is being sent on interface.\n",
+ __func__, ip6_sprintf(&ia->ia_addr.sin6_addr),
+ if_name(ia->ia_ifp)));
+ /*
+ * Send an NS immediately and increase dad_count by
+ * nd6_mmaxtries - 1.
*/
- duplicate++;
- }
-
- if (dp->dad_ns_icount) {
- /* We've seen NS, means DAD has failed. */
- duplicate++;
- }
- DAD_UNLOCK(dp);
-
- if (duplicate) {
- /* (*dp) will be freed in nd6_dad_duplicated() */
- nd6_dad_duplicated(ifa, TRUE);
+ nd6_dad_ns_output(dp, ifa);
+ timeout((void (*)(void *))nd6_dad_timer, (void *)ifa, retrans);
+ goto done;
} else {
+ boolean_t txunsolna;
+ DAD_UNLOCK(dp);
/*
* We are done with DAD. No NA came, no NS came.
* No duplicate address found.
ia->ia6_flags &= ~IN6_IFF_DADPROGRESS;
IFA_UNLOCK(&ia->ia_ifa);
+ ndi = ND_IFINFO(ifa->ifa_ifp);
+ VERIFY(ndi != NULL && ndi->initialized);
+ lck_mtx_lock(&ndi->lock);
+ txunsolna = (ndi->flags & ND6_IFF_REPLICATED) != 0;
+ lck_mtx_unlock(&ndi->lock);
+
+ if (txunsolna) {
+ nd6_unsol_na_output(ifa);
+ }
+
nd6log((LOG_DEBUG,
- "%s: DAD complete for %s - no duplicates found\n",
+ "%s: DAD complete for %s - no duplicates found%s\n",
if_name(ifa->ifa_ifp),
- ip6_sprintf(&ia->ia_addr.sin6_addr)));
- /*
- * Send an Unsolicited Neighbor Advertisement so that
- * other machines on the network are aware of us
- * (important when we are waking from sleep).
- */
- nd6_unsol_na_output(ifa);
- in6_post_msg(ia->ia_ifp, KEV_INET6_NEW_USER_ADDR, ia);
+ ip6_sprintf(&ia->ia_addr.sin6_addr),
+ txunsolna ? ", tx unsolicited NA with O=1" : "."));
+
+ if (dp->dad_ns_lcount > 0)
+ nd6log((LOG_DEBUG,
+ "%s: DAD completed while "
+ "a looped back NS message is detected "
+ "during DAD for %s om interface %s\n",
+ __func__,
+ ip6_sprintf(&ia->ia_addr.sin6_addr),
+ if_name(ia->ia_ifp)));
+
+ in6_post_msg(ia->ia_ifp, KEV_INET6_NEW_USER_ADDR, ia,
+ dp->dad_lladdr);
nd6_dad_detach(dp, ifa);
}
}
}
void
-nd6_dad_duplicated(struct ifaddr *ifa, boolean_t dontignhwdup)
+nd6_dad_duplicated(struct ifaddr *ifa)
{
struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
struct dadq *dp;
struct ifnet *ifp = ifa->ifa_ifp;
- int hwdupposs;
+ boolean_t candisable;
- dp = nd6_dad_find(ifa);
+ dp = nd6_dad_find(ifa, NULL);
if (dp == NULL) {
- log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n");
+ log(LOG_ERR, "%s: DAD structure not found.\n", __func__);
return;
}
- hwdupposs = 0;
IFA_LOCK(&ia->ia_ifa);
DAD_LOCK(dp);
- log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
- "NS in/out=%d/%d, NA in=%d inx=%d\n",
- if_name(ifp), ip6_sprintf(&ia->ia_addr.sin6_addr),
- dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount,
- dp->dad_na_ixcount);
- hwdupposs = dp->dad_na_ixcount;
+ nd6log((LOG_ERR, "%s: NS in/out/loopback=%d/%d, NA in=%d\n",
+ __func__, dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_ns_lcount,
+ dp->dad_na_icount));
+ candisable = FALSE;
+
+ if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr) &&
+ !(ia->ia6_flags & IN6_IFF_SECURED)) {
+ struct in6_addr in6;
+ struct ifaddr *llifa = NULL;
+ struct sockaddr_dl *sdl = NULL;
+ uint8_t *lladdr = dp->dad_lladdr;
+ uint8_t lladdrlen = dp->dad_lladdrlen;
+
+ /*
+ * To avoid over-reaction, we only apply this logic when we are
+ * very sure that hardware addresses are supposed to be unique.
+ */
+ switch (ifp->if_type) {
+ case IFT_BRIDGE:
+ case IFT_ETHER:
+ case IFT_FDDI:
+ case IFT_ATM:
+ case IFT_IEEE1394:
+#ifdef IFT_IEEE80211
+ case IFT_IEEE80211:
+#endif
+ /*
+ * Check if our hardware address matches the
+ * link layer information received in the
+ * NS/NA
+ */
+ llifa = ifp->if_lladdr;
+ IFA_LOCK(llifa);
+ sdl = (struct sockaddr_dl *)(void *)
+ llifa->ifa_addr;
+ if (lladdrlen == sdl->sdl_alen &&
+ bcmp(lladdr, LLADDR(sdl), lladdrlen) == 0)
+ candisable = TRUE;
+ IFA_UNLOCK(llifa);
+
+ in6 = ia->ia_addr.sin6_addr;
+ if (in6_iid_from_hw(ifp, &in6) != 0)
+ break;
+
+ /* Refine decision about whether IPv6 can be disabled */
+ if (candisable &&
+ !IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
+ /*
+ * Apply this logic only to the embedded MAC
+ * address form of link-local IPv6 address.
+ */
+ candisable = FALSE;
+ } else if (lladdr == NULL &&
+ IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
+ /*
+ * We received a NA with no target link-layer
+ * address option. This means that someone else
+ * has our address. Mark it as a hardware
+ * duplicate so we disable IPv6 later on.
+ */
+ candisable = TRUE;
+ }
+ break;
+ default:
+ break;
+ }
+ }
DAD_UNLOCK(dp);
+
ia->ia6_flags &= ~IN6_IFF_DADPROGRESS;
ia->ia6_flags |= IN6_IFF_DUPLICATED;
IFA_UNLOCK(&ia->ia_ifa);
+ /* increment DAD collision counter */
+ ++ip6stat.ip6s_dad_collide;
+
/* We are done with DAD, with duplicated address found. (failure) */
untimeout((void (*)(void *))nd6_dad_timer, (void *)ifa);
IFA_LOCK(&ia->ia_ifa);
- log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
+ log(LOG_ERR, "%s: DAD complete for %s - duplicate found.\n",
if_name(ifp), ip6_sprintf(&ia->ia_addr.sin6_addr));
- log(LOG_ERR, "%s: manual intervention required\n",
- if_name(ifp));
IFA_UNLOCK(&ia->ia_ifa);
-
- if (hwdupposs ||
- (dontignhwdup && IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr))) {
+
+ if (candisable) {
+ struct nd_ifinfo *ndi = ND_IFINFO(ifp);
log(LOG_ERR, "%s: possible hardware address duplication "
- "detected, disable IPv6\n", if_name(ifp));
-
- lck_rw_lock_shared(nd_if_rwlock);
- nd_ifinfo[ifp->if_index].flags |=
- ND6_IFF_IFDISABLED;
- lck_rw_done(nd_if_rwlock);
+ "detected, disabling IPv6 for interface.\n", if_name(ifp));
+
+ VERIFY((NULL != ndi) && (TRUE == ndi->initialized));
+ ndi->flags |= ND6_IFF_IFDISABLED;
+ /* Make sure to set IFEF_IPV6_DISABLED too */
+ nd6_if_disable(ifp, TRUE);
}
+ log(LOG_ERR, "%s: manual intervention required!\n", if_name(ifp));
+
/* Send an event to the configuration agent so that the
* duplicate address will be notified to the user and will
* be removed.
*/
- in6_post_msg(ifp, KEV_INET6_NEW_USER_ADDR, ia);
+ in6_post_msg(ifp, KEV_INET6_NEW_USER_ADDR, ia, dp->dad_lladdr);
nd6_dad_detach(dp, ifa);
DAD_REMREF(dp); /* drop our reference */
}
{
struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
struct ifnet *ifp = ifa->ifa_ifp;
+ int i = 0;
struct in6_addr taddr6;
DAD_LOCK(dp);
IFA_LOCK_SPIN(&ia->ia_ifa);
taddr6 = ia->ia_addr.sin6_addr;
IFA_UNLOCK(&ia->ia_ifa);
- nd6_ns_output(ifp, NULL, &taddr6, NULL, 1);
+ if (dad_enhanced != 0 && !(ifp->if_flags & IFF_POINTOPOINT)) {
+ for (i = 0; i < ND_OPT_NONCE_LEN32; i++)
+ dp->dad_nonce[i] = RandomULong();
+ /*
+ * XXXHRS: Note that in the case that
+ * DupAddrDetectTransmits > 1, multiple NS messages with
+ * different nonces can be looped back in an unexpected
+ * order. The current implementation recognizes only
+ * the latest nonce on the sender side. Practically it
+ * should work well in almost all cases.
+ */
+ }
+ nd6_ns_output(ifp, NULL, &taddr6, NULL,
+ (uint8_t *)&dp->dad_nonce[0]);
}
+/*
+ * @brief Called to process DAD NS
+ *
+ * @param ifa is the pointer to the interface's address
+ * @param lladdr is source link layer information
+ * @param lladdrlen is source's linklayer length
+ *
+ * @return void
+ */
static void
-nd6_dad_ns_input(struct ifaddr *ifa)
+nd6_dad_ns_input(struct ifaddr *ifa, char *lladdr,
+ int lladdrlen, struct nd_opt_nonce *ndopt_nonce)
{
struct dadq *dp;
- int duplicate;
- struct ifnet *ifp;
-
- if (ifa == NULL)
- panic("ifa == NULL in nd6_dad_ns_input");
+ VERIFY(ifa != NULL);
- ifp = ifa->ifa_ifp;
- duplicate = 0;
- dp = nd6_dad_find(ifa);
+ /* Ignore Nonce option when Enhanced DAD is disabled. */
+ if (dad_enhanced == 0)
+ ndopt_nonce = NULL;
- /* Quickhack - completely ignore DAD NS packets */
- if (dad_ignore_ns) {
- struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
- IFA_LOCK(&ia->ia_ifa);
- nd6log((LOG_INFO,
- "nd6_dad_ns_input: ignoring DAD NS packet for "
- "address %s(%s)\n", ip6_sprintf(&ia->ia_addr.sin6_addr),
- if_name(ifa->ifa_ifp)));
- IFA_UNLOCK(&ia->ia_ifa);
+ dp = nd6_dad_find(ifa, ndopt_nonce);
+ if (dp == NULL)
return;
- }
- /*
- * if I'm yet to start DAD, someone else started using this address
- * first. I have a duplicate and you win.
- */
- if (dp != NULL)
- DAD_LOCK(dp);
- if (dp == NULL || dp->dad_ns_ocount == 0)
- duplicate++;
-
- /* XXX more checks for loopback situation - see nd6_dad_timer too */
-
- if (duplicate) {
- if (dp != NULL) {
- DAD_UNLOCK(dp);
- DAD_REMREF(dp);
- dp = NULL;
- }
- nd6_dad_duplicated(ifa, TRUE);
- } else if (dp != NULL) {
- /*
- * not sure if I got a duplicate.
- * increment ns count and see what happens.
- */
- dp->dad_ns_icount++;
- DAD_UNLOCK(dp);
- DAD_REMREF(dp);
+ DAD_LOCK(dp);
+ ++dp->dad_ns_icount;
+ if (lladdr && lladdrlen >= ETHER_ADDR_LEN) {
+ memcpy(dp->dad_lladdr, lladdr, ETHER_ADDR_LEN);
+ dp->dad_lladdrlen = lladdrlen;
}
+ DAD_UNLOCK(dp);
+ DAD_REMREF(dp);
}
-static void
-nd6_dad_na_input(struct ifaddr *ifa, caddr_t lladdr, int lladdrlen)
+/*
+ * @brief Called to process received NA for DAD
+ *
+ * @param m is the pointer to the packet's mbuf
+ * @param ifp is the pointer to the interface on which packet
+ * was receicved.
+ * @param taddr is pointer to target's IPv6 address
+ * @param lladdr is target's link layer information
+ * @param lladdrlen is target's linklayer length
+ *
+ * @return NULL if the packet is consumed by DAD processing, else
+ * pointer to the mbuf.
+ */
+static struct mbuf *
+nd6_dad_na_input(struct mbuf *m, struct ifnet *ifp, struct in6_addr *taddr,
+ caddr_t lladdr, int lladdrlen)
{
- struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
- struct dadq *dp;
- int hwdupposs;
+ struct ifaddr *ifa = NULL;
+ struct in6_ifaddr *ia = NULL;
+ struct dadq *dp = NULL;
+ struct nd_ifinfo *ndi = NULL;
+ boolean_t replicated;
+ ifa = (struct ifaddr *) in6ifa_ifpwithaddr(ifp, taddr);
if (ifa == NULL)
- panic("ifa == NULL in nd6_dad_na_input");
+ return m;
- dp = nd6_dad_find(ifa);
- if (dp == NULL) {
- log(LOG_ERR, "nd6_dad_na_input: DAD structure not found\n");
- return;
+ replicated = FALSE;
+
+ /* Get the ND6_IFF_REPLICATED flag. */
+ ndi = ND_IFINFO(ifp);
+ if (ndi != NULL && ndi->initialized) {
+ lck_mtx_lock(&ndi->lock);
+ replicated = !!(ndi->flags & ND6_IFF_REPLICATED);
+ lck_mtx_unlock(&ndi->lock);
}
-
- /*
- * If the address is a link-local address formed from an interface
- * identifier based on the hardware address which is supposed to be
- * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP
- * operation on the interface SHOULD be disabled according to RFC 4862,
- * section 5.4.5, but here we decide not to disable if the target
- * hardware address is not also ours, which is a transitory possibility
- * in the presence of network-resident sleep proxies on the local link.
- */
- hwdupposs = 0;
+
+ if (replicated) {
+ nd6log((LOG_INFO, "%s: ignoring duplicate NA on "
+ "replicated interface %s\n", __func__, if_name(ifp)));
+ goto done;
+ }
+
+ /* Lock the interface address until done (see label below). */
IFA_LOCK(ifa);
- if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) {
- struct ifnet *ifp;
- struct in6_addr in6;
-
+ ia = (struct in6_ifaddr *) ifa;
+
+ if (!(ia->ia6_flags & IN6_IFF_DADPROGRESS)) {
IFA_UNLOCK(ifa);
- ifp = ifa->ifa_ifp;
-
- /*
- * To avoid over-reaction, we only apply this logic when we are
- * very sure that hardware addresses are supposed to be unique.
- */
- switch (ifp->if_type) {
- case IFT_BRIDGE:
- case IFT_ETHER:
- case IFT_FDDI:
- case IFT_ATM:
- case IFT_IEEE1394:
-#ifdef IFT_IEEE80211
- case IFT_IEEE80211:
-#endif
- /* Check if our hardware address matches the target */
- if (lladdr != NULL && lladdrlen > 0) {
- struct ifaddr *llifa;
- struct sockaddr_dl *sdl;
-
- llifa = ifp->if_lladdr;
- IFA_LOCK(llifa);
- sdl = (struct sockaddr_dl *)(void *)
- llifa->ifa_addr;
- if (lladdrlen == sdl->sdl_alen ||
- bcmp(lladdr, LLADDR(sdl), lladdrlen) == 0)
- hwdupposs = 1;
- IFA_UNLOCK(llifa);
- }
- in6 = ia->ia_addr.sin6_addr;
- if (in6_get_hw_ifid(ifp, &in6) != 0)
- break;
- /*
- * Apply this logic only to the EUI-64 form of
- * link-local interface identifiers.
- */
- IFA_LOCK(ifa);
- if (hwdupposs &&
- !IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
- hwdupposs = 0;
- } else if (lladdr == NULL &&
- IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
- /*
- * We received a NA with no target link-layer
- * address option. This means that someone else
- * has our address. Mark it as a hardware
- * duplicate so we disable IPv6 later on.
- */
- hwdupposs = 1;
- }
+ nd6log((LOG_INFO, "%s: ignoring duplicate NA on "
+ "%s [DAD not in progress]\n", __func__,
+ if_name(ifp)));
+ goto done;
+ }
+
+ /* Some sleep proxies improperly send the client's Ethernet address in
+ * the target link-layer address option, so detect this by comparing
+ * the L2-header source address, if we have seen it, with the target
+ * address, and ignoring the NA if they don't match.
+ */
+ if (lladdr != NULL && lladdrlen >= ETHER_ADDR_LEN) {
+ struct ip6aux *ip6a = ip6_findaux(m);
+ if (ip6a && (ip6a->ip6a_flags & IP6A_HASEEN) != 0 &&
+ bcmp(ip6a->ip6a_ehsrc, lladdr, ETHER_ADDR_LEN) != 0) {
IFA_UNLOCK(ifa);
- break;
- default:
- break;
+ nd6log((LOG_ERR, "%s: ignoring duplicate NA on %s "
+ "[eh_src != tgtlladdr]\n", __func__, if_name(ifp)));
+ goto done;
}
- } else {
- IFA_UNLOCK(ifa);
}
-
+
+ IFA_UNLOCK(ifa);
+
+ dp = nd6_dad_find(ifa, NULL);
+ if (dp == NULL) {
+ nd6log((LOG_INFO, "%s: no DAD structure for %s on %s.\n",
+ __func__, ip6_sprintf(taddr), if_name(ifp)));
+ goto done;
+ }
+
DAD_LOCK_SPIN(dp);
+ if (lladdr != NULL && lladdrlen >= ETHER_ADDR_LEN) {
+ memcpy(dp->dad_lladdr, lladdr, ETHER_ADDR_LEN);
+ dp->dad_lladdrlen = lladdrlen;
+ }
dp->dad_na_icount++;
- if (hwdupposs)
- dp->dad_na_ixcount++;
DAD_UNLOCK(dp);
DAD_REMREF(dp);
-
+
/* remove the address. */
- nd6_dad_duplicated(ifa, FALSE);
+ nd6log((LOG_INFO,
+ "%s: duplicate IPv6 address %s [processing NA on %s]\n", __func__,
+ ip6_sprintf(taddr), if_name(ifp)));
+done:
+ IFA_LOCK_ASSERT_NOTHELD(ifa);
+ IFA_REMREF(ifa);
+ m_freem(m);
+ return NULL;
}
static void
struct sockaddr_dl* sdl, struct sockaddr_in6 *sin6)
{
static const size_t EUI64_LENGTH = 8;
-
+
VERIFY(nd6_need_cache(ifp));
VERIFY(sa);
VERIFY(sdl && (void *)sa != (void *)sdl);
VERIFY(sin6 && (void *)sa != (void *)sin6);
-
+
bzero(sin6, sizeof *sin6);
sin6->sin6_len = sizeof *sin6;
sin6->sin6_family = AF_INET6;
-
+
bzero(sdl, sizeof *sdl);
sdl->sdl_len = sizeof *sdl;
sdl->sdl_family = AF_LINK;
sdl->sdl_type = ifp->if_type;
sdl->sdl_index = ifp->if_index;
-
+
switch (sa->sa_family) {
case AF_INET6: {
struct sockaddr_in6 *sin6a = (struct sockaddr_in6 *)(void *)sa;
struct in6_addr *in6 = &sin6a->sin6_addr;
-
+
VERIFY(sa->sa_len == sizeof *sin6);
-
+
sdl->sdl_nlen = strlen(ifp->if_name);
bcopy(ifp->if_name, sdl->sdl_data, sdl->sdl_nlen);
if (in6->s6_addr[11] == 0xff && in6->s6_addr[12] == 0xfe) {
LLADDR(sdl)[3] = in6->s6_addr[13];
LLADDR(sdl)[4] = in6->s6_addr[14];
LLADDR(sdl)[5] = in6->s6_addr[15];
- }
- else {
+ } else {
sdl->sdl_alen = EUI64_LENGTH;
bcopy(&in6->s6_addr[8], LLADDR(sdl), EUI64_LENGTH);
}
-
+
sdl->sdl_slen = 0;
break;
}
struct sockaddr_dl *sdla = (struct sockaddr_dl *)(void *)sa;
struct in6_addr *in6 = &sin6->sin6_addr;
caddr_t lla = LLADDR(sdla);
-
+
VERIFY(sa->sa_len <= sizeof *sdl);
bcopy(sa, sdl, sa->sa_len);
-
+
sin6->sin6_scope_id = sdla->sdl_index;
if (sin6->sin6_scope_id == 0)
sin6->sin6_scope_id = ifp->if_index;
bcopy(lla, &in6->s6_addr[8], EUI64_LENGTH);
else {
VERIFY(sdla->sdl_alen == ETHER_ADDR_LEN);
-
+
in6->s6_addr[8] = ((uint8_t) lla[0] ^ ND6_EUI64_UBIT);
in6->s6_addr[9] = (uint8_t) lla[1];
in6->s6_addr[10] = (uint8_t) lla[2];
in6->s6_addr[14] = (uint8_t) lla[4];
in6->s6_addr[15] = (uint8_t) lla[5];
}
-
+
break;
}
default:
struct rtentry *rt;
struct llinfo_nd6 *ln;
struct if_llreach *lr;
+ const uint16_t temp_embedded_id = sin6->sin6_addr.s6_addr16[1];
- nd6_cache_lladdr(ifp, &sin6->sin6_addr, LLADDR(sdl),
- sdl->sdl_alen, ND_NEIGHBOR_ADVERT, 0);
+ if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) &&
+ (temp_embedded_id == 0))
+ sin6->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
+
+ nd6_cache_lladdr(ifp, &sin6->sin6_addr, LLADDR(sdl), sdl->sdl_alen,
+ ND_NEIGHBOR_ADVERT, 0);
lck_mtx_assert(rnh_lock, LCK_MTX_ASSERT_NOTOWNED);
lck_mtx_lock(rnh_lock);
rt = rtalloc1_scoped_locked((struct sockaddr *)sin6, 1, 0,
ifp->if_index);
+
+ /* Restore the address that was passed to us */
+ if (temp_embedded_id == 0)
+ sin6->sin6_addr.s6_addr16[1] = 0;
+
if (rt != NULL) {
RT_LOCK(rt);
VERIFY(rt->rt_flags & RTF_LLINFO);
VERIFY(rt->rt_llinfo);
ln = rt->rt_llinfo;
- ln->ln_state = ND6_LLINFO_REACHABLE;
- ln->ln_expire = 0;
+ ND6_CACHE_STATE_TRANSITION(ln, ND6_LLINFO_REACHABLE);
+ ln_setexpire(ln, 0);
lr = ln->ln_llreach;
if (lr) {
if (rt == NULL) {
log(LOG_ERR, "%s: failed to add/update host route to %s.\n",
__func__, ip6_sprintf(&sin6->sin6_addr));
+ } else {
+ nd6log((LOG_DEBUG, "%s: host route to %s [lr=0x%llx]\n",
+ __func__, ip6_sprintf(&sin6->sin6_addr),
+ (uint64_t)VM_KERNEL_ADDRPERM(lr)));
}
}
nd6_alt_node_absent(struct ifnet *ifp, struct sockaddr_in6 *sin6)
{
struct rtentry *rt;
+ const uint16_t temp_embedded_id = sin6->sin6_addr.s6_addr16[1];
+
+ nd6log((LOG_DEBUG, "%s: host route to %s\n", __func__,
+ ip6_sprintf(&sin6->sin6_addr)));
+
+ if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) &&
+ (temp_embedded_id == 0))
+ sin6->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
lck_mtx_assert(rnh_lock, LCK_MTX_ASSERT_NOTOWNED);
lck_mtx_lock(rnh_lock);
rt = rtalloc1_scoped_locked((struct sockaddr *)sin6, 0, 0,
ifp->if_index);
+
+ /* Restore the address that was passed to us */
+ if (temp_embedded_id == 0)
+ sin6->sin6_addr.s6_addr16[1] = 0;
+
if (rt != NULL) {
RT_LOCK(rt);
- if (!(rt->rt_flags & (RTF_PINNED|RTF_CLONING|RTF_PRCLONING)) &&
+ if (!(rt->rt_flags & (RTF_CLONING|RTF_PRCLONING)) &&
(rt->rt_flags & (RTF_HOST|RTF_LLINFO|RTF_WASCLONED)) ==
(RTF_HOST|RTF_LLINFO|RTF_WASCLONED)) {
rt->rt_flags |= RTF_CONDEMNED;
(struct rtentry **)NULL);
rtfree_locked(rt);
- }
- else {
+ } else {
RT_REMREF_LOCKED(rt);
RT_UNLOCK(rt);
}
projects / apple / xnu.git / blobdiff