-/* $KAME: nd6_nbr.c,v 1.32 2000/03/21 11:37:30 itojun Exp $ */
+/*
+ * Copyright (c) 2000-2013 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
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * 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,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * 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@
+ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* SUCH DAMAGE.
*/
-#if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__)
-#include "opt_inet.h"
-#if __NetBSD__ /*XXX*/
-#include "opt_ipsec.h"
-#endif
-#endif
-
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/errno.h>
-#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3)
-#include <sys/ioctl.h>
-#endif
#include <sys/syslog.h>
+#include <sys/sysctl.h>
+#include <sys/mcache.h>
+#include <sys/protosw.h>
#include <kern/queue.h>
+#include <kern/locks.h>
+#include <kern/zalloc.h>
+
#include <net/if.h>
+#include <net/if_var.h>
#include <net/if_types.h>
#include <net/if_dl.h>
+#include <net/if_llreach.h>
#include <net/route.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>
+#include <netinet6/scope6_var.h>
#include <netinet/icmp6.h>
-#ifdef __OpenBSD__ /*don't confuse KAME ipsec with OpenBSD ipsec*/
-#undef IPSEC
-#endif
-
#if IPSEC
#include <netinet6/ipsec.h>
+#if INET6
+#include <netinet6/ipsec6.h>
+#endif
#endif
-
-#include <net/net_osdep.h>
-
-#define SDL(s) ((struct sockaddr_dl *)s)
struct dadq;
-static struct dadq *nd6_dad_find __P((struct ifaddr *));
-static void nd6_dad_timer __P((struct ifaddr *));
-static void nd6_dad_ns_output __P((struct dadq *, struct ifaddr *));
-static void nd6_dad_ns_input __P((struct ifaddr *));
-static void nd6_dad_na_input __P((struct ifaddr *));
+static struct dadq *nd6_dad_find(struct ifaddr *);
+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 mbuf *, struct ifaddr *, char *, int);
+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 */
+static struct zone *dad_zone; /* zone for dadq */
+
+#define DAD_ZONE_MAX 64 /* maximum elements in zone */
+#define DAD_ZONE_NAME "nd6_dad" /* zone name */
+
+#define DAD_LOCK_ASSERT_HELD(_dp) \
+ lck_mtx_assert(&(_dp)->dad_lock, LCK_MTX_ASSERT_OWNED)
+
+#define DAD_LOCK_ASSERT_NOTHELD(_dp) \
+ lck_mtx_assert(&(_dp)->dad_lock, LCK_MTX_ASSERT_NOTOWNED)
+
+#define DAD_LOCK(_dp) \
+ lck_mtx_lock(&(_dp)->dad_lock)
+
+#define DAD_LOCK_SPIN(_dp) \
+ lck_mtx_lock_spin(&(_dp)->dad_lock)
+
+#define DAD_CONVERT_LOCK(_dp) do { \
+ DAD_LOCK_ASSERT_HELD(_dp); \
+ lck_mtx_convert_spin(&(_dp)->dad_lock); \
+} while (0)
+
+#define DAD_UNLOCK(_dp) \
+ lck_mtx_unlock(&(_dp)->dad_lock)
+
+#define DAD_ADDREF(_dp) \
+ dad_addref(_dp, 0)
+
+#define DAD_ADDREF_LOCKED(_dp) \
+ dad_addref(_dp, 1)
+
+#define DAD_REMREF(_dp) \
+ dad_remref(_dp)
+
+extern lck_mtx_t *dad6_mutex;
+extern lck_mtx_t *nd6_mutex;
+
+static int nd6_llreach_base = (LL_BASE_REACHABLE / 1000); /* 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,
+ "default ND6 link-layer reachability max lifetime (in seconds)");
+
/*
- * Input an Neighbor Solicitation Message.
+ * Obtain a link-layer source cache entry for the sender.
*
- * Based on RFC 2461
- * Based on RFC 2462 (duplicated address detection)
+ * NOTE: This is currently only for ND6/Ethernet.
*/
void
-nd6_ns_input(m, off, icmp6len)
- struct mbuf *m;
- int off, icmp6len;
+nd6_llreach_alloc(struct rtentry *rt, struct ifnet *ifp, void *addr,
+ unsigned int alen, boolean_t solicited)
+{
+ struct llinfo_nd6 *ln = rt->rt_llinfo;
+
+ if (nd6_llreach_base != 0 &&
+ (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;
+ const char *why = NULL, *type = "";
+
+ /* Become a regular mutex, just in case */
+ RT_CONVERT_LOCK(rt);
+
+ if ((lr = ln->ln_llreach) != NULL) {
+ type = (solicited ? "ND6 advertisement" :
+ "ND6 unsolicited announcement");
+ /*
+ * If target has changed, create a new record;
+ * otherwise keep existing record.
+ */
+ IFLR_LOCK(lr);
+ if (bcmp(addr, lr->lr_key.addr, alen) != 0) {
+ IFLR_UNLOCK(lr);
+ /* Purge any link-layer info caching */
+ VERIFY(rt->rt_llinfo_purge != NULL);
+ rt->rt_llinfo_purge(rt);
+ lr = NULL;
+ why = " for different target HW address; "
+ "using new llreach record";
+ } else {
+ lr->lr_probes = 0; /* reset probe count */
+ IFLR_UNLOCK(lr);
+ if (solicited) {
+ why = " for same target HW address; "
+ "keeping existing llreach record";
+ }
+ }
+ }
+
+ if (lr == NULL) {
+ lr = ln->ln_llreach = ifnet_llreach_alloc(ifp,
+ ETHERTYPE_IPV6, addr, alen, nd6_llreach_base);
+ if (lr != NULL) {
+ lr->lr_probes = 0; /* reset probe count */
+ if (why == NULL)
+ why = "creating new llreach record";
+ }
+ }
+
+ if (nd6_debug && lr != NULL && why != NULL) {
+ char tmp[MAX_IPv6_STR_LEN];
+
+ 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))));
+ }
+ }
+}
+
+void
+nd6_llreach_use(struct llinfo_nd6 *ln)
+{
+ if (ln->ln_llreach != NULL)
+ ln->ln_lastused = net_uptime();
+}
+
+/*
+ * Input a Neighbor Solicitation Message.
+ *
+ * Based on RFC 4861
+ * Based on RFC 4862 (duplicate address detection)
+ */
+void
+nd6_ns_input(
+ struct mbuf *m,
+ int off,
+ int icmp6len)
{
struct ifnet *ifp = m->m_pkthdr.rcvif;
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
struct in6_addr taddr6;
struct in6_addr myaddr6;
char *lladdr = NULL;
- struct ifaddr *ifa;
+ struct ifaddr *ifa = NULL;
int lladdrlen = 0;
- int anycast = 0, proxy = 0, tentative = 0;
+ int anycast = 0, proxy = 0, dadprogress = 0;
int tlladdr;
union nd_opts ndopts;
- struct sockaddr_dl *proxydl = NULL;
+ struct sockaddr_dl proxydl;
+ boolean_t advrouter;
+ boolean_t is_dad_probe;
- if (ip6->ip6_hlim != 255) {
- log(LOG_ERR,
- "nd6_ns_input: invalid hlim %d\n", ip6->ip6_hlim);
- goto freeit;
+ 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);
+
+ IP6_EXTHDR_CHECK(m, off, icmp6len, return);
+ nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off);
+ 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 (ip6->ip6_hlim != IPV6_MAXHLIM) {
+ nd6log((LOG_ERR,
+ "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n",
+ ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
+ ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
+ goto bad;
}
- if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
- /* dst has to be solicited node multicast address. */
- if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL
- /*don't check ifindex portion*/
- && daddr6.s6_addr32[1] == 0
- && daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE
- && daddr6.s6_addr8[12] == 0xff) {
- ; /*good*/
+ 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 */
+ daddr6.s6_addr32[1] == 0 &&
+ daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE &&
+ daddr6.s6_addr8[12] == 0xff) {
+ ; /* good */
} else {
- log(LOG_INFO, "nd6_ns_input: bad DAD packet "
- "(wrong ip6 dst)\n");
+ nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
+ "(wrong ip6 dst)\n"));
goto bad;
}
- }
+ } else if (!nd6_onlink_ns_rfc4861) {
+ struct sockaddr_in6 src_sa6;
-#ifndef PULLDOWN_TEST
- IP6_EXTHDR_CHECK(m, off, icmp6len,);
- 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;
+ /*
+ * According to recent IETF discussions, it is not a good idea
+ * to accept a NS from an address which would not be deemed
+ * to be a neighbor otherwise. This point is expected to be
+ * clarified in future revisions of the specification.
+ */
+ bzero(&src_sa6, sizeof(src_sa6));
+ src_sa6.sin6_family = AF_INET6;
+ src_sa6.sin6_len = sizeof(src_sa6);
+ src_sa6.sin6_addr = saddr6;
+ if (!nd6_is_addr_neighbor(&src_sa6, ifp, 0)) {
+ nd6log((LOG_INFO, "nd6_ns_input: "
+ "NS packet from non-neighbor\n"));
+ goto bad;
+ }
}
-#endif
- taddr6 = nd_ns->nd_ns_target;
if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
- log(LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n");
+ nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n"));
goto bad;
}
- if (IN6_IS_SCOPE_LINKLOCAL(&taddr6))
- taddr6.s6_addr16[1] = htons(ifp->if_index);
-
icmp6len -= sizeof(*nd_ns);
nd6_option_init(nd_ns + 1, icmp6len, &ndopts);
if (nd6_options(&ndopts) < 0) {
- log(LOG_INFO, "nd6_ns_input: invalid ND option, ignored\n");
- goto bad;
+ nd6log((LOG_INFO,
+ "nd6_ns_input: invalid ND option, ignored\n"));
+ /* nd6_options have incremented stats */
+ goto freeit;
}
if (ndopts.nd_opts_src_lladdr) {
- lladdr = (char *)(ndopts.nd_opts_src_lladdr +1);
+ lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
}
-
- if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) {
- log(LOG_INFO, "nd6_ns_input: bad DAD packet "
- "(link-layer address option)\n");
+
+ if (is_dad_probe && lladdr) {
+ nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
+ "(link-layer address option)\n"));
goto bad;
}
* In implementation, we add target link-layer address by default.
* We do not add one in MUST NOT cases.
*/
-#if 0 /* too much! */
- ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &daddr6);
- if (ifa && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST))
- tlladdr = 0;
- else
-#endif
if (!IN6_IS_ADDR_MULTICAST(&daddr6))
tlladdr = 0;
else
* Target address (taddr6) must be either:
* (1) Valid unicast/anycast address for my receiving interface,
* (2) Unicast address for which I'm offering proxy service, or
- * (3) "tentative" address on which DAD is being performed.
+ * (3) "tentative" or "optimistic" address [DAD is in progress].
*/
/* (1) and (3) check. */
ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
/* (2) check. */
- if (!ifa) {
+ if (ifa == NULL) {
struct rtentry *rt;
struct sockaddr_in6 tsin6;
- bzero(&tsin6, sizeof tsin6);
+ bzero(&tsin6, sizeof tsin6);
tsin6.sin6_len = sizeof(struct sockaddr_in6);
tsin6.sin6_family = AF_INET6;
tsin6.sin6_addr = taddr6;
- rt = rtalloc1((struct sockaddr *)&tsin6, 0
-#if __FreeBSD__ || defined (__APPLE__)
- , 0
-#endif /* __FreeBSD__ */
- );
- if (rt && (rt->rt_flags & RTF_ANNOUNCE) != 0 &&
- rt->rt_gateway->sa_family == AF_LINK) {
- /*
- * proxy NDP for single entry
- */
- ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
- IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
- if (ifa) {
- proxy = 1;
- proxydl = SDL(rt->rt_gateway);
+ rt = rtalloc1_scoped((struct sockaddr *)&tsin6, 0, 0,
+ ifp->if_index);
+
+ if (rt != NULL) {
+ RT_LOCK(rt);
+ if ((rt->rt_flags & RTF_ANNOUNCE) != 0 &&
+ rt->rt_gateway->sa_family == AF_LINK) {
+ /*
+ * proxy NDP for single entry
+ */
+ ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(
+ ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
+ if (ifa) {
+ proxy = 1;
+ proxydl = *SDL(rt->rt_gateway);
+ }
}
- }
- if (rt)
+ RT_UNLOCK(rt);
rtfree(rt);
+ }
}
- if (!ifa) {
+ if (ifa == NULL && ip6_forwarding && nd6_prproxy) {
/*
- * We've got a NS packet, and we don't have that adddress
- * assigned for us. We MUST silently ignore it.
- * See RFC2461 7.2.3.
+ * Is the target address part of the prefix that is being
+ * proxied and installed on another interface?
+ */
+ ifa = (struct ifaddr *)in6ifa_prproxyaddr(&taddr6);
+ }
+ if (ifa == NULL) {
+ /*
+ * We've got an NS packet, and we don't have that address
+ * assigned for us. We MUST silently ignore it on this
+ * interface, c.f. RFC 4861 7.2.3.
+ *
+ * Forwarding associated with NDPRF_PRPROXY may apply.
*/
+ if (ip6_forwarding && nd6_prproxy)
+ nd6_prproxy_ns_input(ifp, &saddr6, lladdr,
+ lladdrlen, &daddr6, &taddr6);
goto freeit;
}
+ IFA_LOCK(ifa);
myaddr6 = *IFA_IN6(ifa);
anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST;
- tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE;
- if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED)
+ dadprogress =
+ ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DADPROGRESS;
+ if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED) {
+ IFA_UNLOCK(ifa);
goto freeit;
+ }
+ IFA_UNLOCK(ifa);
if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
- log(LOG_INFO,
+ nd6log((LOG_INFO,
"nd6_ns_input: lladdrlen mismatch for %s "
"(if %d, NS packet %d)\n",
- ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2);
+ ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2));
+ goto bad;
}
if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
- log(LOG_INFO,
- "nd6_ns_input: duplicate IP6 address %s\n",
- ip6_sprintf(&saddr6));
+ nd6log((LOG_INFO,
+ "nd6_ns_input: duplicate IP6 address %s\n",
+ ip6_sprintf(&saddr6)));
goto freeit;
}
/*
* We have neighbor solicitation packet, with target address equals to
- * one of my tentative address.
+ * one of my DAD in-progress addresses.
*
* src addr how to process?
* --- ---
* unicast somebody is doing address resolution -> ignore
* unspec dup address detection
*
- * The processing is defined in RFC 2462.
+ * 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 (tentative) {
+ if (dadprogress) {
/*
* If source address is unspecified address, it is for
- * duplicated address detection.
+ * duplicate address detection.
*
* If not, the packet is for addess resolution;
* silently ignore it.
*/
- if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
- nd6_dad_ns_input(ifa);
+ if (is_dad_probe)
+ nd6_dad_ns_input(m, ifa, lladdr, lladdrlen);
goto freeit;
}
+ /* Are we an advertising router on this interface? */
+ advrouter = (ifp->if_eflags & IFEF_IPV6_ROUTER);
+
/*
* If the source address is unspecified address, entries must not
* be created or updated.
- * It looks that sender is performing DAD. Output NA toward
- * all-node multicast address, to tell the sender that I'm using
+ * It looks that sender is performing DAD. If I'm using the address,
+ * and it's a "preferred" address, i.e. not optimistic, then output NA
+ * toward all-node multicast address, to tell the sender that I'm using
* the address.
* S bit ("solicited") must be zero.
*/
- if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
+ if (is_dad_probe) {
saddr6 = in6addr_linklocal_allnodes;
- saddr6.s6_addr16[1] = htons(ifp->if_index);
- nd6_na_output(ifp, &saddr6, &taddr6,
- ((anycast || proxy || !tlladdr)
- ? 0 : ND_NA_FLAG_OVERRIDE)
- | (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0),
- tlladdr, (struct sockaddr *)proxydl);
+ if (in6_setscope(&saddr6, ifp, NULL) != 0)
+ goto bad;
+ if ((dadprogress & IN6_IFF_OPTIMISTIC) == 0)
+ nd6_na_output(ifp, &saddr6, &taddr6,
+ ((anycast || proxy || !tlladdr) ? 0 :
+ ND_NA_FLAG_OVERRIDE) | (advrouter ?
+ ND_NA_FLAG_ROUTER : 0), tlladdr, proxy ?
+ (struct sockaddr *)&proxydl : NULL);
goto freeit;
}
- nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_NEIGHBOR_SOLICIT, 0);
+ nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen,
+ ND_NEIGHBOR_SOLICIT, 0);
nd6_na_output(ifp, &saddr6, &taddr6,
- ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE)
- | (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0)
- | ND_NA_FLAG_SOLICITED,
- tlladdr, (struct sockaddr *)proxydl);
+ ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
+ (advrouter ? ND_NA_FLAG_ROUTER : 0) | ND_NA_FLAG_SOLICITED,
+ tlladdr, proxy ? (struct sockaddr *)&proxydl : NULL);
freeit:
m_freem(m);
+ if (ifa != NULL)
+ IFA_REMREF(ifa);
return;
bad:
- log(LOG_ERR, "nd6_ns_input: src=%s\n", ip6_sprintf(&saddr6));
- log(LOG_ERR, "nd6_ns_input: dst=%s\n", ip6_sprintf(&daddr6));
- log(LOG_ERR, "nd6_ns_input: tgt=%s\n", ip6_sprintf(&taddr6));
+ nd6log((LOG_ERR, "nd6_ns_input: src=%s\n", ip6_sprintf(&saddr6)));
+ nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n", ip6_sprintf(&daddr6)));
+ nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n", ip6_sprintf(&taddr6)));
+ icmp6stat.icp6s_badns++;
m_freem(m);
+ if (ifa != NULL)
+ IFA_REMREF(ifa);
}
/*
- * Output an Neighbor Solicitation Message. Caller specifies:
+ * Output a Neighbor Solicitation Message. Caller specifies:
* - ICMP6 header source IP6 address
* - ND6 header target IP6 address
* - ND6 header source datalink address
*
- * Based on RFC 2461
- * Based on RFC 2462 (duplicated 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.
*/
void
-nd6_ns_output(ifp, daddr6, taddr6, ln, dad)
- struct ifnet *ifp;
- struct in6_addr *daddr6, *taddr6;
- struct llinfo_nd6 *ln; /* for source address determination */
- int dad; /* duplicated address detection */
+nd6_ns_output(
+ struct ifnet *ifp,
+ const struct in6_addr *daddr6,
+ const struct in6_addr *taddr6,
+ struct llinfo_nd6 *ln, /* for source address determination */
+ int dad) /* duplicated address detection */
{
struct mbuf *m;
struct ip6_hdr *ip6;
struct nd_neighbor_solicit *nd_ns;
struct in6_ifaddr *ia = NULL;
- struct ip6_moptions im6o;
+ struct in6_addr *src, src_in, src_storage;
+ struct ip6_moptions *im6o = NULL;
+ struct ifnet *outif = NULL;
int icmp6len;
int maxlen;
+ int flags;
caddr_t mac;
- struct ifnet *outif = NULL;
-
- if (IN6_IS_ADDR_MULTICAST(taddr6))
+ struct route_in6 ro;
+ struct ip6_out_args ip6oa = { IFSCOPE_NONE, { 0 },
+ IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR, 0 };
+ u_int32_t rtflags = 0;
+
+ if ((ifp->if_eflags & IFEF_IPV6_ND6ALT) || IN6_IS_ADDR_MULTICAST(taddr6))
return;
+ bzero(&ro, sizeof(ro));
+
+ ip6oa.ip6oa_boundif = ifp->if_index;
+ ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF;
+
/* estimate the size of message */
maxlen = sizeof(*ip6) + sizeof(*nd_ns);
maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
if (max_linkhdr + maxlen >= MCLBYTES) {
-#ifdef DIAGNOSTIC
+#if DIAGNOSTIC
printf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES "
"(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES);
#endif
return;
}
- MGETHDR(m, M_DONTWAIT, MT_DATA);
+ MGETHDR(m, M_DONTWAIT, MT_DATA); /* XXXMAC: mac_create_mbuf_linklayer() probably */
if (m && max_linkhdr + maxlen >= MHLEN) {
MCLGET(m, M_DONTWAIT);
if ((m->m_flags & M_EXT) == 0) {
}
if (m == NULL)
return;
+ m->m_pkthdr.rcvif = NULL;
if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
m->m_flags |= M_MCAST;
- im6o.im6o_multicast_ifp = ifp;
- im6o.im6o_multicast_hlim = 255;
- im6o.im6o_multicast_loop = 0;
+
+ im6o = ip6_allocmoptions(M_DONTWAIT);
+ if (im6o == NULL) {
+ m_freem(m);
+ return;
+ }
+
+ im6o->im6o_multicast_ifp = ifp;
+ im6o->im6o_multicast_hlim = IPV6_MAXHLIM;
+ im6o->im6o_multicast_loop = 0;
}
icmp6len = sizeof(*nd_ns);
m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
- m->m_data += max_linkhdr; /*or MH_ALIGN() equivalent?*/
+ m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */
/* fill neighbor solicitation packet */
ip6 = mtod(m, struct ip6_hdr *);
ip6->ip6_vfc |= IPV6_VERSION;
/* ip6->ip6_plen will be set later */
ip6->ip6_nxt = IPPROTO_ICMPV6;
- ip6->ip6_hlim = 255;
+ ip6->ip6_hlim = IPV6_MAXHLIM;
if (daddr6)
ip6->ip6_dst = *daddr6;
else {
ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
- ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index);
+ ip6->ip6_dst.s6_addr16[1] = 0;
ip6->ip6_dst.s6_addr32[1] = 0;
ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
ip6->ip6_dst.s6_addr8[12] = 0xff;
+ if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
+ goto bad;
}
if (!dad) {
-#if 0 /* KAME way, exact address scope match */
- /*
- * Select a source whose scope is the same as that of the dest.
- * Typically, the dest is link-local solicitation multicast
- * (i.e. neighbor discovery) or link-local/global unicast
- * (i.e. neighbor un-reachability detection).
- */
- ia = in6_ifawithifp(ifp, &ip6->ip6_dst);
- if (ia == NULL) {
- m_freem(m);
- return;
- }
- ip6->ip6_src = ia->ia_addr.sin6_addr;
-#else /* spec-wise correct */
/*
* RFC2461 7.2.2:
* "If the source address of the packet prompting the
* (saddr6), if:
* - saddr6 is given from the caller (by giving "ln"), and
* - saddr6 belongs to the outgoing interface.
- * Otherwise, we perform a scope-wise match.
+ * Otherwise, we perform the source address selection as usual.
*/
- struct ip6_hdr *hip6; /*hold ip6*/
- struct in6_addr *saddr6;
-
- if (ln && ln->ln_hold) {
- hip6 = mtod(ln->ln_hold, struct ip6_hdr *);
- /* XXX pullup? */
- if (sizeof(*hip6) < ln->ln_hold->m_len)
- saddr6 = &hip6->ip6_src;
- else
- saddr6 = NULL;
- } else
- saddr6 = NULL;
- if (saddr6 && in6ifa_ifpwithaddr(ifp, saddr6))
- bcopy(saddr6, &ip6->ip6_src, sizeof(*saddr6));
- else {
- ia = in6_ifawithifp(ifp, &ip6->ip6_dst);
- if (ia == NULL) {
- m_freem(m); /*XXX*/
- return;
+ struct ip6_hdr *hip6; /* hold ip6 */
+ struct in6_addr *hsrc = NULL;
+
+ /* Caller holds ref on this route */
+ if (ln != NULL) {
+ RT_LOCK(ln->ln_rt);
+ /*
+ * assuming every packet in ln_hold has the same IP
+ * header
+ */
+ if (ln->ln_hold != NULL) {
+ hip6 = mtod(ln->ln_hold, struct ip6_hdr *);
+ /* XXX pullup? */
+ if (sizeof (*hip6) < ln->ln_hold->m_len)
+ hsrc = &hip6->ip6_src;
+ else
+ hsrc = NULL;
+ }
+ /* Update probe count, if applicable */
+ if (ln->ln_llreach != NULL) {
+ IFLR_LOCK_SPIN(ln->ln_llreach);
+ ln->ln_llreach->lr_probes++;
+ IFLR_UNLOCK(ln->ln_llreach);
+ }
+ rtflags = ln->ln_rt->rt_flags;
+ RT_UNLOCK(ln->ln_rt);
+ }
+ if (hsrc != NULL && (ia = in6ifa_ifpwithaddr(ifp, hsrc)) &&
+ (ia->ia6_flags & IN6_IFF_OPTIMISTIC) == 0) {
+ src = hsrc;
+ } else {
+ int error;
+ struct sockaddr_in6 dst_sa;
+
+ bzero(&dst_sa, sizeof(dst_sa));
+ dst_sa.sin6_family = AF_INET6;
+ dst_sa.sin6_len = sizeof(dst_sa);
+ dst_sa.sin6_addr = ip6->ip6_dst;
+
+ src = in6_selectsrc(&dst_sa, NULL,
+ NULL, &ro, NULL, &src_storage, ip6oa.ip6oa_boundif,
+ &error);
+ if (src == NULL) {
+ nd6log((LOG_DEBUG,
+ "nd6_ns_output: source can't be "
+ "determined: dst=%s, error=%d\n",
+ ip6_sprintf(&dst_sa.sin6_addr),
+ error));
+ 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,
+ "nd6_ns_output: no preferred source "
+ "available: dst=%s\n",
+ ip6_sprintf(&dst_sa.sin6_addr)));
+ goto bad;
}
- ip6->ip6_src = ia->ia_addr.sin6_addr;
}
-#endif
} else {
/*
* Source address for DAD packet must always be IPv6
* unspecified address. (0::0)
+ * We actually don't have to 0-clear the address (we did it
+ * above), but we do so here explicitly to make the intention
+ * clearer.
*/
- bzero(&ip6->ip6_src, sizeof(ip6->ip6_src));
+ bzero(&src_in, sizeof(src_in));
+ src = &src_in;
+ ip6oa.ip6oa_flags &= ~IP6OAF_BOUND_SRCADDR;
}
+ ip6->ip6_src = *src;
nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
nd_ns->nd_ns_code = 0;
nd_ns->nd_ns_reserved = 0;
nd_ns->nd_ns_target = *taddr6;
-
- if (IN6_IS_SCOPE_LINKLOCAL(&nd_ns->nd_ns_target))
- nd_ns->nd_ns_target.s6_addr16[1] = 0;
+ in6_clearscope(&nd_ns->nd_ns_target); /* XXX */
/*
* Add source link-layer address option.
struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
/* 8 byte alignments... */
optlen = (optlen + 7) & ~7;
-
+
m->m_pkthdr.len += optlen;
m->m_len += optlen;
icmp6len += optlen;
nd_ns->nd_ns_cksum
= in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
-#if IPSEC
- /* Don't lookup socket */
- ipsec_setsocket(m, NULL);
-#endif
- ip6_output(m, NULL, NULL, dad ? IPV6_DADOUTPUT : 0, &im6o, &outif);
+ flags = dad ? 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.pkt_flags |= PKTF_RESOLVE_RTR;
+
+ if (ifp->if_eflags & IFEF_TXSTART) {
+ /*
+ * Use control service class if the interface
+ * supports transmit-start model
+ */
+ (void) m_set_service_class(m, MBUF_SC_CTL);
+ }
+
+ ip6_output(m, NULL, NULL, flags, im6o, &outif, &ip6oa);
if (outif) {
icmp6_ifstat_inc(outif, ifs6_out_msg);
icmp6_ifstat_inc(outif, ifs6_out_neighborsolicit);
+ ifnet_release(outif);
}
icmp6stat.icp6s_outhist[ND_NEIGHBOR_SOLICIT]++;
+
+exit:
+ if (im6o != NULL)
+ IM6O_REMREF(im6o);
+
+ ROUTE_RELEASE(&ro); /* we don't cache this route. */
+
+ if (ia != NULL)
+ IFA_REMREF(&ia->ia_ifa);
+ return;
+
+bad:
+ m_freem(m);
+ goto exit;
}
/*
* Neighbor advertisement input handling.
*
- * Based on RFC 2461
- * Based on RFC 2462 (duplicated 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(m, off, icmp6len)
- struct mbuf *m;
- int off, 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 *);
struct nd_neighbor_advert *nd_na;
-#if 0
struct in6_addr saddr6 = ip6->ip6_src;
-#endif
struct in6_addr daddr6 = ip6->ip6_dst;
struct in6_addr taddr6;
int flags;
int is_override;
char *lladdr = NULL;
int lladdrlen = 0;
- struct ifaddr *ifa;
struct llinfo_nd6 *ln;
struct rtentry *rt;
struct sockaddr_dl *sdl;
union nd_opts ndopts;
+ uint64_t timenow;
- if (ip6->ip6_hlim != 255) {
- log(LOG_ERR,
- "nd6_na_input: invalid hlim %d\n", ip6->ip6_hlim);
- goto freeit;
+ if ((ifp->if_eflags & IFEF_IPV6_ND6ALT) != 0) {
+ nd6log((LOG_INFO, "nd6_na_input: on ND6ALT interface!\n"));
+ return;
}
-#ifndef PULLDOWN_TEST
- IP6_EXTHDR_CHECK(m, off, icmp6len,);
- 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;
+ /* Expect 32-bit aligned data pointer on strict-align platforms */
+ MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
+
+ if (ip6->ip6_hlim != IPV6_MAXHLIM) {
+ nd6log((LOG_ERR,
+ "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
+ ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
+ ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
+ goto bad;
}
-#endif
- taddr6 = nd_na->nd_na_target;
+
+ IP6_EXTHDR_CHECK(m, off, icmp6len, return);
+ nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
+ m->m_pkthdr.pkt_flags |= PKTF_INET6_RESOLVE;
+
flags = nd_na->nd_na_flags_reserved;
is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
- if (IN6_IS_SCOPE_LINKLOCAL(&taddr6))
- taddr6.s6_addr16[1] = htons(ifp->if_index);
+ taddr6 = nd_na->nd_na_target;
+ if (in6_setscope(&taddr6, ifp, NULL))
+ goto bad; /* XXX: impossible */
if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
- log(LOG_ERR,
+ nd6log((LOG_ERR,
"nd6_na_input: invalid target address %s\n",
- ip6_sprintf(&taddr6));
- goto freeit;
+ ip6_sprintf(&taddr6)));
+ goto bad;
}
if (IN6_IS_ADDR_MULTICAST(&daddr6))
if (is_solicited) {
- log(LOG_ERR,
- "nd6_na_input: a solicited adv is multicasted\n");
- goto freeit;
+ nd6log((LOG_ERR,
+ "nd6_na_input: a solicited adv is multicasted\n"));
+ goto bad;
}
icmp6len -= sizeof(*nd_na);
nd6_option_init(nd_na + 1, icmp6len, &ndopts);
if (nd6_options(&ndopts) < 0) {
- log(LOG_INFO, "nd6_na_input: invalid ND option, ignored\n");
+ nd6log((LOG_INFO,
+ "nd6_na_input: invalid ND option, ignored\n"));
+ /* nd6_options have incremented stats */
goto freeit;
}
if (ndopts.nd_opts_tgt_lladdr) {
lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
+
+ 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 = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
+ 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)
+ nd6_prproxy_na_input(ifp, &saddr6, &daddr6, &taddr6, flags);
/*
- * Target address matches one of my interface address.
- *
- * If my address is tentative, this means that there's somebody
- * already using the same address as mine. This indicates DAD failure.
- * This is defined in RFC 2462.
- *
- * Otherwise, process as defined in RFC 2461.
+ * If no neighbor cache entry is found, NA SHOULD silently be
+ * discarded. If we are forwarding (and Scoped Routing is in
+ * effect), try to see if there is a neighbor cache entry on
+ * another interface (in case we are doing prefix proxying.)
*/
- if (ifa
- && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
- nd6_dad_na_input(ifa);
- goto freeit;
- }
+ if ((rt = nd6_lookup(&taddr6, 0, ifp, 0)) == NULL) {
+ if (!ip6_forwarding || !ip6_doscopedroute || !nd6_prproxy)
+ goto freeit;
- /* Just for safety, maybe unnecessery. */
- if (ifa) {
- log(LOG_ERR,
- "nd6_na_input: duplicate IP6 address %s\n",
- ip6_sprintf(&taddr6));
- goto freeit;
- }
+ if ((rt = nd6_lookup(&taddr6, 0, NULL, 0)) == NULL)
+ goto freeit;
- if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
- log(LOG_INFO,
- "nd6_na_input: lladdrlen mismatch for %s "
- "(if %d, NA packet %d)\n",
- ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2);
+ RT_LOCK_ASSERT_HELD(rt);
+ if (rt->rt_ifp != ifp) {
+ /*
+ * Purge any link-layer info caching.
+ */
+ if (rt->rt_llinfo_purge != NULL)
+ rt->rt_llinfo_purge(rt);
+
+ /* Adjust route ref count for the interfaces */
+ if (rt->rt_if_ref_fn != NULL) {
+ rt->rt_if_ref_fn(ifp, 1);
+ rt->rt_if_ref_fn(rt->rt_ifp, -1);
+ }
+
+ /* 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;
+ }
}
- /*
- * If no neighbor cache entry is found, NA SHOULD silently be discarded.
- */
- rt = nd6_lookup(&taddr6, 0, ifp);
- if ((rt == NULL) ||
- ((ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) ||
- ((sdl = SDL(rt->rt_gateway)) == NULL))
+ RT_LOCK_ASSERT_HELD(rt);
+ if ((ln = rt->rt_llinfo) == NULL ||
+ (sdl = SDL(rt->rt_gateway)) == NULL) {
+ RT_REMREF_LOCKED(rt);
+ RT_UNLOCK(rt);
goto freeit;
+ }
+
+ timenow = net_uptime();
if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
/*
* If the link-layer has address, and no lladdr option came,
* discard the packet.
*/
- if (ifp->if_addrlen && !lladdr)
+ if (ifp->if_addrlen && !lladdr) {
+ RT_REMREF_LOCKED(rt);
+ RT_UNLOCK(rt);
goto freeit;
+ }
/*
* Record link-layer address, and update the state.
bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
if (is_solicited) {
ln->ln_state = ND6_LLINFO_REACHABLE;
- if (ln->ln_expire)
-#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) && !defined(__APPLE__)
- ln->ln_expire = time.tv_sec +
-#else
- ln->ln_expire = time_second +
-#endif
- nd_ifinfo[rt->rt_ifp->if_index].reachable;
- } else
+ if (ln->ln_expire != 0) {
+ struct nd_ifinfo *ndi;
+
+ lck_rw_lock_shared(nd_if_rwlock);
+ ndi = ND_IFINFO(rt->rt_ifp);
+ VERIFY(ndi != NULL && ndi->initialized);
+ lck_mtx_lock(&ndi->lock);
+ 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_router = is_router;
+ ln_setexpire(ln, timenow + nd6_gctimer);
+ }
+ if ((ln->ln_router = is_router) != 0) {
+ /*
+ * This means a router's state has changed from
+ * non-reachable to probably reachable, and might
+ * affect the status of associated prefixes..
+ */
+ RT_UNLOCK(rt);
+ lck_mtx_lock(nd6_mutex);
+ pfxlist_onlink_check();
+ lck_mtx_unlock(nd6_mutex);
+ RT_LOCK(rt);
+ }
} else {
int llchange;
* 1 1 y n (2a) L *->REACHABLE
* 1 1 y y (2a) L *->REACHABLE
*/
- if (!is_override && (lladdr && llchange)) { /* (1) */
+ if (!is_override && (lladdr != NULL && llchange)) { /* (1) */
/*
* If state is REACHABLE, make it STALE.
* no other updates should be done.
*/
- if (ln->ln_state == ND6_LLINFO_REACHABLE)
+ if (ln->ln_state == ND6_LLINFO_REACHABLE) {
ln->ln_state = ND6_LLINFO_STALE;
+ ln_setexpire(ln, timenow + nd6_gctimer);
+ }
+ RT_REMREF_LOCKED(rt);
+ RT_UNLOCK(rt);
goto freeit;
} else if (is_override /* (2a) */
|| (!is_override && (lladdr && !llchange)) /* (2b) */
*/
if (is_solicited) {
ln->ln_state = ND6_LLINFO_REACHABLE;
- if (ln->ln_expire) {
-#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) && !defined(__APPLE__)
- ln->ln_expire = time.tv_sec +
-#else
- ln->ln_expire = time_second +
-#endif
- nd_ifinfo[ifp->if_index].reachable;
+ if (ln->ln_expire != 0) {
+ struct nd_ifinfo *ndi;
+
+ lck_rw_lock_shared(nd_if_rwlock);
+ ndi = ND_IFINFO(ifp);
+ VERIFY(ndi != NULL && ndi->initialized);
+ lck_mtx_lock(&ndi->lock);
+ 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)
+ if (lladdr && llchange) {
ln->ln_state = ND6_LLINFO_STALE;
+ ln_setexpire(ln, timenow + nd6_gctimer);
+ }
}
}
*/
struct nd_defrouter *dr;
struct in6_addr *in6;
- int s;
+ struct ifnet *rt_ifp = rt->rt_ifp;
- in6 = &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr;
-#if __NetBSD__
- s = splsoftnet();
-#else
- s = splnet();
-#endif
- dr = defrouter_lookup(in6, rt->rt_ifp);
- if (dr)
+ in6 = &((struct sockaddr_in6 *)
+ (void *)rt_key(rt))->sin6_addr;
+
+ RT_UNLOCK(rt);
+ lck_mtx_lock(nd6_mutex);
+ dr = defrouter_lookup(in6, rt_ifp);
+ if (dr) {
defrtrlist_del(dr);
- else if (!ip6_forwarding && ip6_accept_rtadv) {
- /*
- * 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->rt_ifp);
+ 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);
+ }
}
- splx(s);
+ RT_LOCK(rt);
}
ln->ln_router = is_router;
}
+ RT_LOCK_ASSERT_HELD(rt);
rt->rt_flags &= ~RTF_REJECT;
+
+ /* cache the gateway (sender HW) address */
+ nd6_llreach_alloc(rt, ifp, LLADDR(sdl), sdl->sdl_alen, TRUE);
+
+ /* update the llinfo, send a queued packet if there is one */
ln->ln_asked = 0;
- if (ln->ln_hold) {
-#if OLDIP6OUTPUT
- (*ifp->if_output)(ifp, ln->ln_hold, rt_key(rt), rt);
-#else
- nd6_output(ifp, ln->ln_hold,
- (struct sockaddr_in6 *)rt_key(rt), rt);
-#endif
- ln->ln_hold = 0;
+ if (ln->ln_hold != NULL) {
+ struct mbuf *m_hold, *m_hold_next;
+ struct sockaddr_in6 sin6;
+
+ rtkey_to_sa6(rt, &sin6);
+ /*
+ * reset the ln_hold in advance, to explicitly
+ * 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_next = m_hold->m_nextpkt;
+ m_hold->m_nextpkt = NULL;
+ /*
+ * we assume ifp is not a loopback here, so just set
+ * the 2nd argument as the 1st one.
+ */
+ RT_UNLOCK(rt);
+ 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:
+bad:
+ icmp6stat.icp6s_badna++;
+ /* fall through */
+
+freeit:
m_freem(m);
}
* 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)
+ *
+ * tlladdr - 1 if include target link-layer address
+ * sdl0 - sockaddr_dl (= proxy NA) or NULL
*/
void
-nd6_na_output(ifp, daddr6, taddr6, flags, tlladdr, sdl0)
- struct ifnet *ifp;
- struct in6_addr *daddr6, *taddr6;
- u_long flags;
- int tlladdr; /* 1 if include target link-layer address */
- struct sockaddr *sdl0; /* sockaddr_dl (= proxy NA) or NULL */
+nd6_na_output(
+ struct ifnet *ifp,
+ const struct in6_addr *daddr6_0,
+ const struct in6_addr *taddr6,
+ uint32_t flags,
+ int tlladdr, /* 1 if include target link-layer address */
+ struct sockaddr *sdl0) /* sockaddr_dl (= proxy NA) or NULL */
{
struct mbuf *m;
struct ip6_hdr *ip6;
struct nd_neighbor_advert *nd_na;
- struct in6_ifaddr *ia = NULL;
- struct ip6_moptions im6o;
- int icmp6len;
- int maxlen;
- caddr_t mac;
- struct ifnet *outif = NULL;
+ struct ip6_moptions *im6o = NULL;
+ caddr_t mac = NULL;
+ struct route_in6 ro;
+ struct in6_addr *src, src_storage, daddr6;
+ struct in6_ifaddr *ia;
+ 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, 0 };
+
+ bzero(&ro, sizeof(ro));
+
+ daddr6 = *daddr6_0; /* make a local copy for modification */
+
+ ip6oa.ip6oa_boundif = ifp->if_index;
+ ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF;
/* estimate the size of message */
maxlen = sizeof(*ip6) + sizeof(*nd_na);
maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
if (max_linkhdr + maxlen >= MCLBYTES) {
-#ifdef DIAGNOSTIC
+#if DIAGNOSTIC
printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES "
"(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES);
#endif
return;
}
- MGETHDR(m, M_DONTWAIT, MT_DATA);
+ MGETHDR(m, M_DONTWAIT, MT_DATA); /* XXXMAC: mac_create_mbuf_linklayer() probably */
if (m && max_linkhdr + maxlen >= MHLEN) {
MCLGET(m, M_DONTWAIT);
if ((m->m_flags & M_EXT) == 0) {
}
if (m == NULL)
return;
+ m->m_pkthdr.rcvif = NULL;
- if (IN6_IS_ADDR_MULTICAST(daddr6)) {
+ if (IN6_IS_ADDR_MULTICAST(&daddr6)) {
m->m_flags |= M_MCAST;
- im6o.im6o_multicast_ifp = ifp;
- im6o.im6o_multicast_hlim = 255;
- im6o.im6o_multicast_loop = 0;
+
+ im6o = ip6_allocmoptions(M_DONTWAIT);
+ if (im6o == NULL) {
+ m_freem(m);
+ return;
+ }
+
+ im6o->im6o_multicast_ifp = ifp;
+ im6o->im6o_multicast_hlim = IPV6_MAXHLIM;
+ im6o->im6o_multicast_loop = 0;
}
icmp6len = sizeof(*nd_na);
m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
- m->m_data += max_linkhdr; /*or MH_ALIGN() equivalent?*/
+ m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */
/* fill neighbor advertisement packet */
ip6 = mtod(m, struct ip6_hdr *);
ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
ip6->ip6_vfc |= IPV6_VERSION;
ip6->ip6_nxt = IPPROTO_ICMPV6;
- ip6->ip6_hlim = 255;
- if (IN6_IS_ADDR_UNSPECIFIED(daddr6)) {
+ ip6->ip6_hlim = IPV6_MAXHLIM;
+ if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
/* reply to DAD */
- ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
- ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index);
- ip6->ip6_dst.s6_addr32[1] = 0;
- ip6->ip6_dst.s6_addr32[2] = 0;
- ip6->ip6_dst.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
+ daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
+ daddr6.s6_addr16[1] = 0;
+ daddr6.s6_addr32[1] = 0;
+ daddr6.s6_addr32[2] = 0;
+ daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
+ if (in6_setscope(&daddr6, ifp, NULL))
+ goto bad;
+
flags &= ~ND_NA_FLAG_SOLICITED;
} else
- ip6->ip6_dst = *daddr6;
+ ip6->ip6_dst = daddr6;
+
+ bzero(&dst_sa, sizeof(struct sockaddr_in6));
+ dst_sa.sin6_family = AF_INET6;
+ dst_sa.sin6_len = sizeof(struct sockaddr_in6);
+ dst_sa.sin6_addr = daddr6;
/*
* Select a source whose scope is the same as that of the dest.
*/
- ia = in6_ifawithifp(ifp, &ip6->ip6_dst);
- if (ia == NULL) {
- m_freem(m);
- return;
+ bcopy(&dst_sa, &ro.ro_dst, sizeof(dst_sa));
+ src = in6_selectsrc(&dst_sa, NULL, NULL, &ro, NULL, &src_storage,
+ ip6oa.ip6oa_boundif, &error);
+ if (src == NULL) {
+ nd6log((LOG_DEBUG, "nd6_na_output: source can't be "
+ "determined: dst=%s, error=%d\n",
+ ip6_sprintf(&dst_sa.sin6_addr), error));
+ goto bad;
+ }
+ ip6->ip6_src = *src;
+
+ /*
+ * RFC 4429 requires not setting "override" flag on NA packets sent
+ * from optimistic addresses.
+ */
+ ia = in6ifa_ifpwithaddr(ifp, src);
+ if (ia != NULL) {
+ if (ia->ia6_flags & IN6_IFF_OPTIMISTIC)
+ flags &= ~ND_NA_FLAG_OVERRIDE;
+ IFA_REMREF(&ia->ia_ifa);
}
- ip6->ip6_src = ia->ia_addr.sin6_addr;
+
nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
nd_na->nd_na_code = 0;
nd_na->nd_na_target = *taddr6;
- if (IN6_IS_SCOPE_LINKLOCAL(&nd_na->nd_na_target))
- nd_na->nd_na_target.s6_addr16[1] = 0;
+ in6_clearscope(&nd_na->nd_na_target); /* XXX */
/*
* "tlladdr" indicates NS's condition for adding tlladdr or not.
* target lladdr option SHOULD NOT be included.
*/
if (tlladdr) {
- mac = NULL;
/*
* sdl0 != NULL indicates proxy NA. If we do proxy, use
* lladdr in sdl0. If we are not proxying (sending NA for
mac = nd6_ifptomac(ifp);
else if (sdl0->sa_family == AF_LINK) {
struct sockaddr_dl *sdl;
- sdl = (struct sockaddr_dl *)sdl0;
+ sdl = (struct sockaddr_dl *)(void *)sdl0;
if (sdl->sdl_alen == ifp->if_addrlen)
mac = LLADDR(sdl);
}
if (tlladdr && mac) {
int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
-
+
/* roundup to 8 bytes alignment! */
optlen = (optlen + 7) & ~7;
nd_na->nd_na_cksum =
in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
-#if IPSEC
- /* Don't lookup socket */
- ipsec_setsocket(m, NULL);
-#endif
- ip6_output(m, NULL, NULL, 0, &im6o, &outif);
+ m->m_pkthdr.pkt_flags |= PKTF_INET6_RESOLVE;
+
+ if (ifp->if_eflags & IFEF_TXSTART) {
+ /* Use control service class if the interface supports
+ * transmit-start model.
+ */
+ (void) m_set_service_class(m, MBUF_SC_CTL);
+ }
+
+ ip6_output(m, NULL, NULL, IPV6_OUTARGS, im6o, &outif, &ip6oa);
if (outif) {
icmp6_ifstat_inc(outif, ifs6_out_msg);
icmp6_ifstat_inc(outif, ifs6_out_neighboradvert);
+ ifnet_release(outif);
}
icmp6stat.icp6s_outhist[ND_NEIGHBOR_ADVERT]++;
+
+exit:
+ if (im6o != NULL)
+ IM6O_REMREF(im6o);
+
+ ROUTE_RELEASE(&ro);
+ return;
+
+bad:
+ m_freem(m);
+ goto exit;
}
caddr_t
-nd6_ifptomac(ifp)
- struct ifnet *ifp;
+nd6_ifptomac(
+ struct ifnet *ifp)
{
switch (ifp->if_type) {
case IFT_ARCNET:
case IFT_ETHER:
+ case IFT_IEEE8023ADLAG:
case IFT_FDDI:
-#if __NetBSD__
- return LLADDR(ifp->if_sadl);
-#else
- return ((caddr_t)(ifp + 1));
+ case IFT_IEEE1394:
+#ifdef IFT_L2VLAN
+ case IFT_L2VLAN:
#endif
- break;
+#ifdef IFT_IEEE80211
+ case IFT_IEEE80211:
+#endif
+#ifdef IFT_CARP
+ case IFT_CARP:
+#endif
+ case IFT_BRIDGE:
+ case IFT_ISO88025:
+ return ((caddr_t)IF_LLADDR(ifp));
default:
return NULL;
}
TAILQ_HEAD(dadq_head, dadq);
struct dadq {
+ decl_lck_mtx_data(, dad_lock);
+ u_int32_t dad_refcount; /* reference count */
+ int dad_attached;
TAILQ_ENTRY(dadq) dad_list;
struct ifaddr *dad_ifa;
int dad_count; /* max NS to send */
int dad_ns_ocount; /* NS sent so far */
int dad_ns_icount;
int dad_na_icount;
-#if defined(__FreeBSD__) && __FreeBSD__ >= 3
- struct callout_handle dad_timer;
-#endif
+ int dad_nd_ixcount; /* Count of IFDISABLED eligible ND rx'd */
+ uint8_t dad_ehsrc[ETHER_ADDR_LEN];
};
static struct dadq_head dadq;
+void
+nd6_nbr_init(void)
+{
+ int i;
+
+ TAILQ_INIT(&dadq);
+
+ dad_size = sizeof (struct dadq);
+ dad_zone = zinit(dad_size, DAD_ZONE_MAX * dad_size, 0, DAD_ZONE_NAME);
+ if (dad_zone == NULL) {
+ panic("%s: failed allocating %s", __func__, DAD_ZONE_NAME);
+ /* NOTREACHED */
+ }
+ zone_change(dad_zone, Z_EXPAND, TRUE);
+ zone_change(dad_zone, Z_CALLERACCT, FALSE);
+
+ bzero(&hostrtmask, sizeof hostrtmask);
+ hostrtmask.sin6_family = AF_INET6;
+ hostrtmask.sin6_len = sizeof hostrtmask;
+ for (i = 0; i < sizeof hostrtmask.sin6_addr; ++i)
+ hostrtmask.sin6_addr.s6_addr[i] = 0xff;
+}
+
static struct dadq *
-nd6_dad_find(ifa)
- struct ifaddr *ifa;
+nd6_dad_find(struct ifaddr *ifa)
{
struct dadq *dp;
+ lck_mtx_lock(dad6_mutex);
for (dp = dadq.tqh_first; dp; dp = dp->dad_list.tqe_next) {
- if (dp->dad_ifa == ifa)
- return dp;
+ DAD_LOCK_SPIN(dp);
+ if (dp->dad_ifa == ifa) {
+ DAD_ADDREF_LOCKED(dp);
+ DAD_UNLOCK(dp);
+ lck_mtx_unlock(dad6_mutex);
+ return (dp);
+ }
+ DAD_UNLOCK(dp);
}
- return NULL;
+ lck_mtx_unlock(dad6_mutex);
+ return (NULL);
+}
+
+void
+nd6_dad_stoptimer(
+ struct ifaddr *ifa)
+{
+
+ untimeout((void (*)(void *))nd6_dad_timer, (void *)ifa);
}
/*
- * Start Duplicated Address Detection (DAD) for specified interface address.
+ * Start Duplicate Address Detection (DAD) for specified interface address.
*/
void
-nd6_dad_start(ifa, tick)
- struct ifaddr *ifa;
- int *tick; /* minimum delay ticks for IFF_UP event */
+nd6_dad_start(
+ struct ifaddr *ifa,
+ int *tick_delay) /* minimum delay ticks for IFF_UP event */
{
struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
struct dadq *dp;
- static int dad_init = 0;
- if (!dad_init) {
- TAILQ_INIT(&dadq);
- dad_init++;
- }
+ 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.
* - DAD is disabled (ip6_dad_count == 0)
* - the interface address is anycast
*/
- if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) {
+ IFA_LOCK(&ia->ia_ifa);
+ if (!(ia->ia6_flags & IN6_IFF_DADPROGRESS)) {
log(LOG_DEBUG,
- "nd6_dad_start: called with non-tentative address "
+ "nd6_dad_start: not a tentative or optimistic address "
"%s(%s)\n",
ip6_sprintf(&ia->ia_addr.sin6_addr),
ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
+ IFA_UNLOCK(&ia->ia_ifa);
return;
}
- if (ia->ia6_flags & IN6_IFF_ANYCAST) {
- ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
- return;
- }
- if (!ip6_dad_count) {
- ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
+ if (!ip6_dad_count || (ia->ia6_flags & IN6_IFF_ANYCAST) != 0) {
+ ia->ia6_flags &= ~IN6_IFF_DADPROGRESS;
+ IFA_UNLOCK(&ia->ia_ifa);
return;
}
- if (!ifa->ifa_ifp)
+ IFA_UNLOCK(&ia->ia_ifa);
+ if (ifa->ifa_ifp == NULL)
panic("nd6_dad_start: ifa->ifa_ifp == NULL");
- if (!(ifa->ifa_ifp->if_flags & IFF_UP))
+ if (!(ifa->ifa_ifp->if_flags & IFF_UP) ||
+ (ifa->ifa_ifp->if_eflags & IFEF_IPV6_ND6ALT)) {
return;
- if (nd6_dad_find(ifa) != NULL) {
+ }
+ if ((dp = nd6_dad_find(ifa)) != NULL) {
+ DAD_REMREF(dp);
/* DAD already in progress */
return;
}
- dp = _MALLOC(sizeof(*dp), M_IP6NDP, M_NOWAIT);
+ dp = zalloc(dad_zone);
if (dp == NULL) {
log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
"%s(%s)\n",
ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
return;
}
- bzero(dp, sizeof(*dp));
- TAILQ_INSERT_TAIL(&dadq, (struct dadq *)dp, dad_list);
+ bzero(dp, dad_size);
+ lck_mtx_init(&dp->dad_lock, ifa_mtx_grp, ifa_mtx_attr);
-#if ND6_DEBUG
- log(LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
- ip6_sprintf(&ia->ia_addr.sin6_addr));
-#endif
+ /* Callee adds one reference for us */
+ dp = nd6_dad_attach(dp, ifa);
+
+ nd6log((LOG_DEBUG, "%s: starting %sDAD for %s\n",
+ if_name(ifa->ifa_ifp),
+ (ia->ia6_flags & IN6_IFF_OPTIMISTIC) ? "optimistic " : "",
+ ip6_sprintf(&ia->ia_addr.sin6_addr)));
/*
* Send NS packet for DAD, ip6_dad_count times.
* first packet to be sent from the interface after interface
* (re)initialization.
*/
- dp->dad_ifa = ifa;
- ifa->ifa_refcnt++; /*just for safety*/
- dp->dad_count = ip6_dad_count;
- dp->dad_ns_icount = dp->dad_na_icount = 0;
- dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
- if (!tick) {
+ if (tick_delay == NULL) {
+ u_int32_t retrans;
+ struct nd_ifinfo *ndi;
+
nd6_dad_ns_output(dp, ifa);
-#if defined(__FreeBSD__) && __FreeBSD__ >= 3
- dp->dad_timer =
-#endif
- timeout((void (*) __P((void *)))nd6_dad_timer, (void *)ifa,
- nd_ifinfo[ifa->ifa_ifp->if_index].retrans * hz / 1000);
+ 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;
- if (*tick == 0)
+ if (*tick_delay == 0)
ntick = random() % (MAX_RTR_SOLICITATION_DELAY * hz);
else
- ntick = *tick + random() % (hz / 2);
- *tick = ntick;
-#if defined(__FreeBSD__) && __FreeBSD__ >= 3
- dp->dad_timer =
-#endif
- timeout((void (*) __P((void *)))nd6_dad_timer, (void *)ifa,
+ ntick = *tick_delay + random() % (hz / 2);
+ *tick_delay = ntick;
+ timeout((void (*)(void *))nd6_dad_timer, (void *)ifa,
ntick);
}
+
+ DAD_REMREF(dp); /* drop our reference */
+}
+
+static struct dadq *
+nd6_dad_attach(struct dadq *dp, struct ifaddr *ifa)
+{
+ lck_mtx_lock(dad6_mutex);
+ DAD_LOCK(dp);
+ dp->dad_ifa = ifa;
+ IFA_ADDREF(ifa); /* for dad_ifa */
+ 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_nd_ixcount = 0;
+ VERIFY(!dp->dad_attached);
+ dp->dad_attached = 1;
+ DAD_ADDREF_LOCKED(dp); /* for caller */
+ DAD_ADDREF_LOCKED(dp); /* for dadq_head list */
+ TAILQ_INSERT_TAIL(&dadq, (struct dadq *)dp, dad_list);
+ DAD_UNLOCK(dp);
+ lck_mtx_unlock(dad6_mutex);
+
+ return (dp);
}
static void
-nd6_dad_timer(ifa)
- struct ifaddr *ifa;
+nd6_dad_detach(struct dadq *dp, struct ifaddr *ifa)
+{
+ int detached;
+
+ lck_mtx_lock(dad6_mutex);
+ DAD_LOCK(dp);
+ if ((detached = dp->dad_attached)) {
+ VERIFY(dp->dad_ifa == ifa);
+ TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
+ dp->dad_list.tqe_next = NULL;
+ dp->dad_list.tqe_prev = NULL;
+ dp->dad_attached = 0;
+ }
+ DAD_UNLOCK(dp);
+ lck_mtx_unlock(dad6_mutex);
+ if (detached) {
+ DAD_REMREF(dp); /* drop dadq_head reference */
+ }
+}
+
+/*
+ * terminate DAD unconditionally. used for address removals.
+ */
+void
+nd6_dad_stop(struct ifaddr *ifa)
{
- int s;
- struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
struct dadq *dp;
-#ifdef __APPLE__
- boolean_t funnel_state;
- funnel_state = thread_set_funneled(TRUE);
-#endif
-#if __NetBSD__
- s = splsoftnet(); /*XXX*/
-#else
- s = splnet(); /*XXX*/
-#endif
+ dp = nd6_dad_find(ifa);
+ if (!dp) {
+ /* DAD wasn't started yet */
+ return;
+ }
+
+ untimeout((void (*)(void *))nd6_dad_timer, (void *)ifa);
+
+ nd6_dad_detach(dp, ifa);
+ DAD_REMREF(dp); /* drop our reference */
+}
+
+static void
+nd6_unsol_na_output(struct ifaddr *ifa)
+{
+ struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
+ struct ifnet *ifp = ifa->ifa_ifp;
+ struct in6_addr saddr6, taddr6;
+
+ if ((ifp->if_flags & IFF_UP) == 0 ||
+ (ifp->if_flags & IFF_RUNNING) == 0 ||
+ (ifp->if_eflags & IFEF_IPV6_ND6ALT) != 0)
+ return;
+
+ IFA_LOCK_SPIN(&ia->ia_ifa);
+ taddr6 = ia->ia_addr.sin6_addr;
+ IFA_UNLOCK(&ia->ia_ifa);
+ if (in6_setscope(&taddr6, ifp, NULL) != 0)
+ return;
+ saddr6 = in6addr_linklocal_allnodes;
+ if (in6_setscope(&saddr6, ifp, NULL) != 0)
+ return;
+
+ nd6log((LOG_INFO, "%s: sending unsolicited NA\n",
+ if_name(ifa->ifa_ifp)));
+
+ nd6_na_output(ifp, &saddr6, &taddr6, ND_NA_FLAG_OVERRIDE, 1, NULL);
+}
+
+static void
+nd6_dad_timer(struct ifaddr *ifa)
+{
+ struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
+ struct dadq *dp = NULL;
+ struct nd_ifinfo *ndi;
/* Sanity check */
if (ia == NULL) {
log(LOG_ERR, "nd6_dad_timer: called with null parameter\n");
goto done;
}
+
+ 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);
if (dp == NULL) {
log(LOG_ERR, "nd6_dad_timer: DAD structure not found\n");
goto done;
}
+ IFA_LOCK(&ia->ia_ifa);
if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
"%s(%s)\n",
ip6_sprintf(&ia->ia_addr.sin6_addr),
ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
+ IFA_UNLOCK(&ia->ia_ifa);
goto done;
}
- if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
- log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
- "%s(%s)\n",
+ if ((ia->ia6_flags & IN6_IFF_DADPROGRESS) == 0) {
+ log(LOG_ERR, "nd6_dad_timer: not a tentative or optimistic "
+ "address %s(%s)\n",
ip6_sprintf(&ia->ia_addr.sin6_addr),
ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
+ IFA_UNLOCK(&ia->ia_ifa);
goto done;
}
+ IFA_UNLOCK(&ia->ia_ifa);
/* timeouted with IFF_{RUNNING,UP} check */
+ DAD_LOCK(dp);
if (dp->dad_ns_tcount > dad_maxtry) {
- log(LOG_ERR, "%s: could not run DAD, driver problem?\n",
- if_name(ifa->ifa_ifp));
+ DAD_UNLOCK(dp);
+ nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n",
+ if_name(ifa->ifa_ifp)));
- TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
- _FREE(dp, M_IP6NDP);
- dp = NULL;
- IFAFREE(ifa);
+ nd6_dad_detach(dp, ifa);
goto done;
}
/* Need more checks? */
if (dp->dad_ns_ocount < dp->dad_count) {
+ u_int32_t retrans;
+
+ DAD_UNLOCK(dp);
/*
* We have more NS to go. Send NS packet for DAD.
*/
nd6_dad_ns_output(dp, ifa);
-#if defined(__FreeBSD__) && __FreeBSD__ >= 3
- dp->dad_timer =
-#endif
- timeout((void (*) __P((void *)))nd6_dad_timer, (void *)ifa,
- nd_ifinfo[ifa->ifa_ifp->if_index].retrans * hz / 1000);
+ 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;
+ boolean_t candisable;
duplicate = 0;
+ candisable = dp->dad_nd_ixcount > 0;
if (dp->dad_na_icount) {
/*
}
if (dp->dad_ns_icount) {
-#if 0 /*heuristics*/
- /*
- * if
- * - we have sent many(?) DAD NS, and
- * - the number of NS we sent equals to the
- * number of NS we've got, and
- * - we've got no NA
- * we may have a faulty network card/driver which
- * loops back multicasts to myself.
- */
- if (3 < dp->dad_count
- && dp->dad_ns_icount == dp->dad_count
- && dp->dad_na_icount == 0) {
- log(LOG_INFO, "DAD questionable for %s(%s): "
- "network card loops back multicast?\n",
- ip6_sprintf(&ia->ia_addr.sin6_addr),
- if_name(ifa->ifa_ifp));
- /* XXX consider it a duplicate or not? */
- /* duplicate++; */
- } else {
- /* We've seen NS, means DAD has failed. */
- duplicate++;
- }
-#else
/* We've seen NS, means DAD has failed. */
duplicate++;
-#endif
}
+ DAD_UNLOCK(dp);
if (duplicate) {
- /* (*dp) will be freed in nd6_dad_duplicated() */
- dp = NULL;
+ 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 {
+ boolean_t txunsolna;
+
/*
* We are done with DAD. No NA came, no NS came.
- * duplicated address found.
+ * No duplicate address found.
*/
- ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
+ IFA_LOCK_SPIN(&ia->ia_ifa);
+ ia->ia6_flags &= ~IN6_IFF_DADPROGRESS;
+ IFA_UNLOCK(&ia->ia_ifa);
+
+ lck_rw_lock_shared(nd_if_rwlock);
+ 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);
+ lck_rw_done(nd_if_rwlock);
+
+ if (txunsolna) {
+ nd6_unsol_na_output(ifa);
+ }
-#if ND6_DEBUG
- log(LOG_INFO,
- "%s: DAD complete for %s - no duplicates found\n",
+ nd6log((LOG_DEBUG,
+ "%s: DAD complete for %s - no duplicates found%s\n",
if_name(ifa->ifa_ifp),
- ip6_sprintf(&ia->ia_addr.sin6_addr));
-#endif
-
- TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
- _FREE(dp, M_IP6NDP);
- dp = NULL;
- IFAFREE(ifa);
+ ip6_sprintf(&ia->ia_addr.sin6_addr),
+ txunsolna ? ", tx unsolicited NA with O=1" : "."));
+ in6_post_msg(ia->ia_ifp, KEV_INET6_NEW_USER_ADDR, ia,
+ dp->dad_ehsrc);
+ nd6_dad_detach(dp, ifa);
}
}
done:
- splx(s);
-#ifdef __APPLE__
- (void) thread_set_funneled(funnel_state);
-#endif
+ if (dp != NULL)
+ DAD_REMREF(dp); /* drop our reference */
}
void
-nd6_dad_duplicated(ifa)
- struct ifaddr *ifa;
+nd6_dad_duplicated(struct ifaddr *ifa)
{
struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
struct dadq *dp;
+ struct ifnet *ifp = ifa->ifa_ifp;
+ boolean_t disable;
dp = nd6_dad_find(ifa);
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;
}
-
- log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: %d NS, "
- "%d NA\n", if_name(ifa->ifa_ifp),
- ip6_sprintf(&ia->ia_addr.sin6_addr),
- dp->dad_ns_icount, dp->dad_na_icount);
-
- ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
+ IFA_LOCK(&ia->ia_ifa);
+ DAD_LOCK(dp);
+ nd6log((LOG_ERR, "%s: NS in/out=%d/%d, NA in=%d, ND x=%d\n",
+ __func__, dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount,
+ dp->dad_nd_ixcount));
+ disable = dp->dad_nd_ixcount > 0;
+ 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 (*) __P((void *)))nd6_dad_timer, (void *)ifa
-#if defined(__FreeBSD__) && __FreeBSD__ >= 3
- , dp->dad_timer
-#endif
- );
+ untimeout((void (*)(void *))nd6_dad_timer, (void *)ifa);
+
+ IFA_LOCK(&ia->ia_ifa);
+ log(LOG_ERR, "%s: DAD complete for %s - duplicate found.\n",
+ if_name(ifp), ip6_sprintf(&ia->ia_addr.sin6_addr));
+ IFA_UNLOCK(&ia->ia_ifa);
+
+ if (disable) {
+ log(LOG_ERR, "%s: possible hardware address duplication "
+ "detected, disabling IPv6 for interface.\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);
+ /* Make sure to set IFEF_IPV6_DISABLED too */
+ nd6_if_disable(ifp, TRUE);
+ }
- log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
- if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr));
- log(LOG_ERR, "%s: manual intervention required\n",
- if_name(ifa->ifa_ifp));
+ log(LOG_ERR, "%s: manual intervention required!\n", if_name(ifp));
- TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
- _FREE(dp, M_IP6NDP);
- dp = NULL;
- IFAFREE(ifa);
+ /* 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, dp->dad_ehsrc);
+ nd6_dad_detach(dp, ifa);
+ DAD_REMREF(dp); /* drop our reference */
}
static void
-nd6_dad_ns_output(dp, ifa)
- struct dadq *dp;
- struct ifaddr *ifa;
+nd6_dad_ns_output(struct dadq *dp, struct ifaddr *ifa)
{
struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
struct ifnet *ifp = ifa->ifa_ifp;
+ struct in6_addr taddr6;
+ DAD_LOCK(dp);
dp->dad_ns_tcount++;
if ((ifp->if_flags & IFF_UP) == 0) {
-#if 0
- printf("%s: interface down?\n", if_name(ifp));
-#endif
+ DAD_UNLOCK(dp);
return;
}
if ((ifp->if_flags & IFF_RUNNING) == 0) {
-#if 0
- printf("%s: interface not running?\n", if_name(ifp));
-#endif
+ DAD_UNLOCK(dp);
return;
}
dp->dad_ns_ocount++;
- nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1);
+ DAD_UNLOCK(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);
}
static void
-nd6_dad_ns_input(ifa)
- struct ifaddr *ifa;
+nd6_dad_ns_input(struct mbuf *m, struct ifaddr *ifa, char *lladdr,
+ int lladdrlen)
{
- struct in6_ifaddr *ia;
- struct ifnet *ifp;
- struct in6_addr *taddr6;
struct dadq *dp;
- int duplicate;
-
- if (!ifa)
- panic("ifa == NULL in nd6_dad_ns_input");
+ struct in6_ifaddr *ia;
+ boolean_t candisable, dadstarted;
+ struct ip6aux *ip6a;
+
+ VERIFY(ifa != NULL);
+ candisable = FALSE;
+ IFA_LOCK(ifa);
+ ia = (struct in6_ifaddr *) ifa;
+ if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) {
+ ip6a = ip6_findaux(m);
+ candisable = TRUE;
+ if (ip6a && (ip6a->ip6a_flags & IP6A_HASEEN) != 0) {
+ struct in6_addr in6 = ia->ia_addr.sin6_addr;
+
+ nd6log((LOG_INFO,
+ "%s: eh_src=%02x:%02x:%02x:%02x:%02x:%02x -> %s\n",
+ __func__,
+ ip6a->ip6a_ehsrc[0], ip6a->ip6a_ehsrc[1],
+ ip6a->ip6a_ehsrc[2], ip6a->ip6a_ehsrc[3],
+ ip6a->ip6a_ehsrc[4], ip6a->ip6a_ehsrc[5],
+ if_name(ifa->ifa_ifp)));
+
+ in6.s6_addr8[8] = ip6a->ip6a_ehsrc[0] ^ ND6_EUI64_UBIT;
+ in6.s6_addr8[9] = ip6a->ip6a_ehsrc[1];
+ in6.s6_addr8[10] = ip6a->ip6a_ehsrc[2];
+ in6.s6_addr8[11] = 0xff;
+ in6.s6_addr8[12] = 0xfe;
+ in6.s6_addr8[13] = ip6a->ip6a_ehsrc[3];
+ in6.s6_addr8[14] = ip6a->ip6a_ehsrc[4];
+ in6.s6_addr8[15] = ip6a->ip6a_ehsrc[5];
+
+ if (!IN6_ARE_ADDR_EQUAL(&in6, &ia->ia_addr.sin6_addr)) {
+ nd6log((LOG_ERR, "%s: DAD NS for %s on %s "
+ "is from another MAC address.\n", __func__,
+ ip6_sprintf(&ia->ia_addr.sin6_addr),
+ if_name(ifa->ifa_ifp)));
+ candisable = FALSE;
+ }
+ } else {
+ nd6log((LOG_INFO,
+ "%s: no eh_src for DAD NS %s at %s.\n", __func__,
+ ip6_sprintf(&ia->ia_addr.sin6_addr),
+ if_name(ifa->ifa_ifp)));
+ }
+ }
+ IFA_UNLOCK(ifa);
- ia = (struct in6_ifaddr *)ifa;
- ifp = ifa->ifa_ifp;
- taddr6 = &ia->ia_addr.sin6_addr;
- duplicate = 0;
+ /* If DAD has not yet started, then this DAD NS probe is proof that
+ * another node has started first. Otherwise, it could be a multicast
+ * loopback, in which case it should be counted and handled later in
+ * the DAD timer callback.
+ */
+ dadstarted = FALSE;
dp = nd6_dad_find(ifa);
+ if (dp != NULL) {
+ DAD_LOCK(dp);
+ ++dp->dad_ns_icount;
+ if (candisable)
+ ++dp->dad_nd_ixcount;
+ if (dp->dad_ns_ocount > 0)
+ dadstarted = TRUE;
+ if (lladdr && lladdrlen >= ETHER_ADDR_LEN)
+ memcpy(dp->dad_ehsrc, lladdr, ETHER_ADDR_LEN);
+ DAD_UNLOCK(dp);
+ DAD_REMREF(dp);
+ dp = NULL;
+ }
- /*
- * If it is from myself, ignore this.
- */
- if (ifp && (ifp->if_flags & IFF_LOOPBACK))
- return;
+ nd6log((LOG_INFO, "%s: dadstarted=%d candisable=%d\n",
+ __func__, dadstarted, candisable));
- /* Quickhack - completely ignore DAD NS packets */
- if (dad_ignore_ns) {
- log(LOG_INFO, "nd6_dad_ns_input: ignoring DAD NS packet for "
- "address %s(%s)\n", ip6_sprintf(taddr6),
- if_name(ifa->ifa_ifp));
- return;
+ if (!dadstarted) {
+ nd6log((LOG_INFO,
+ "%s: duplicate IPv6 address %s [processing NS on %s]\n",
+ __func__, ip6_sprintf(&ia->ia_addr.sin6_addr),
+ if_name(ifa->ifa_ifp)));
+ nd6_dad_duplicated(ifa);
+ }
+}
+
+static struct mbuf *
+nd6_dad_na_input(struct mbuf *m, struct ifnet *ifp, struct in6_addr *taddr,
+ caddr_t lladdr, int lladdrlen)
+{
+ struct ifaddr *ifa;
+ struct in6_ifaddr *ia;
+ struct dadq *dp;
+ struct nd_ifinfo *ndi;
+ boolean_t candisable, replicated;
+
+ ifa = (struct ifaddr *) in6ifa_ifpwithaddr(ifp, taddr);
+ if (ifa == NULL)
+ return m;
+
+ candisable = FALSE;
+ replicated = FALSE;
+
+ /* Get the ND6_IFF_REPLICATED flag. */
+ lck_rw_lock_shared(nd_if_rwlock);
+ 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);
+ }
+ lck_rw_done(nd_if_rwlock);
+ 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);
+ ia = (struct in6_ifaddr *) ifa;
+
/*
- * if I'm yet to start DAD, someone else started using this address
- * first. I have a duplicate and you win.
+ * 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.
*/
- if (!dp || dp->dad_ns_ocount == 0)
- duplicate++;
+ if (!(ia->ia6_flags & IN6_IFF_DADPROGRESS)) {
+ IFA_UNLOCK(ifa);
+ 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);
+ nd6log((LOG_ERR, "%s: ignoring duplicate NA on %s "
+ "[eh_src != tgtlladdr]\n", __func__, if_name(ifp)));
+ goto done;
+ }
+ }
- /* XXX more checks for loopback situation - see nd6_dad_timer too */
+ IFA_UNLOCK(ifa);
+
+ if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr) &&
+ !(ia->ia6_flags & IN6_IFF_SECURED)) {
+ struct in6_addr in6;
- if (duplicate) {
- dp = NULL; /* will be freed in nd6_dad_duplicated() */
- nd6_dad_duplicated(ifa);
- } else {
/*
- * not sure if I got a duplicate.
- * increment ns count and see what happens.
+ * To avoid over-reaction, we only apply this logic when we are
+ * very sure that hardware addresses are supposed to be unique.
*/
- if (dp)
- dp->dad_ns_icount++;
+ 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)
+ 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 */
+ IFA_LOCK(ifa);
+ 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;
+ }
+ IFA_UNLOCK(ifa);
+ break;
+ default:
+ break;
+ }
}
+
+ dp = nd6_dad_find(ifa);
+ 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_ehsrc, lladdr, ETHER_ADDR_LEN);
+ dp->dad_na_icount++;
+ if (candisable)
+ dp->dad_nd_ixcount++;
+ DAD_UNLOCK(dp);
+ DAD_REMREF(dp);
+
+ /* remove the address. */
+ nd6log((LOG_INFO,
+ "%s: duplicate IPv6 address %s [processing NA on %s]\n", __func__,
+ ip6_sprintf(taddr), if_name(ifp)));
+ nd6_dad_duplicated(ifa);
+
+done:
+ IFA_LOCK_ASSERT_NOTHELD(ifa);
+ IFA_REMREF(ifa);
+ m_freem(m);
+ return NULL;
}
static void
-nd6_dad_na_input(ifa)
+dad_addref(struct dadq *dp, int locked)
+{
+ if (!locked)
+ DAD_LOCK_SPIN(dp);
+ else
+ DAD_LOCK_ASSERT_HELD(dp);
+
+ if (++dp->dad_refcount == 0) {
+ panic("%s: dad %p wraparound refcnt\n", __func__, dp);
+ /* NOTREACHED */
+ }
+ if (!locked)
+ DAD_UNLOCK(dp);
+}
+
+static void
+dad_remref(struct dadq *dp)
+{
struct ifaddr *ifa;
+
+ DAD_LOCK_SPIN(dp);
+ if (dp->dad_refcount == 0)
+ panic("%s: dad %p negative refcnt\n", __func__, dp);
+ --dp->dad_refcount;
+ if (dp->dad_refcount > 0) {
+ DAD_UNLOCK(dp);
+ return;
+ }
+ DAD_UNLOCK(dp);
+
+ if (dp->dad_attached ||
+ dp->dad_list.tqe_next != NULL || dp->dad_list.tqe_prev != NULL) {
+ panic("%s: attached dad=%p is being freed", __func__, dp);
+ /* NOTREACHED */
+ }
+
+ if ((ifa = dp->dad_ifa) != NULL) {
+ IFA_REMREF(ifa); /* drop dad_ifa reference */
+ dp->dad_ifa = NULL;
+ }
+
+ lck_mtx_destroy(&dp->dad_lock, ifa_mtx_grp);
+ zfree(dad_zone, dp);
+}
+
+void
+nd6_llreach_set_reachable(struct ifnet *ifp, void *addr, unsigned int alen)
{
- struct dadq *dp;
+ /* Nothing more to do if it's disabled */
+ if (nd6_llreach_base == 0)
+ return;
- if (!ifa)
- panic("ifa == NULL in nd6_dad_na_input");
+ ifnet_llreach_set_reachable(ifp, ETHERTYPE_IPV6, addr, alen);
+}
- dp = nd6_dad_find(ifa);
- if (dp)
- dp->dad_na_icount++;
+void
+nd6_alt_node_addr_decompose(struct ifnet *ifp, struct sockaddr *sa,
+ 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) {
+ sdl->sdl_alen = ETHER_ADDR_LEN;
+ LLADDR(sdl)[0] = (in6->s6_addr[8] ^ ND6_EUI64_UBIT);
+ LLADDR(sdl)[1] = in6->s6_addr[9];
+ LLADDR(sdl)[2] = in6->s6_addr[10];
+ LLADDR(sdl)[3] = in6->s6_addr[13];
+ LLADDR(sdl)[4] = in6->s6_addr[14];
+ LLADDR(sdl)[5] = in6->s6_addr[15];
+ } else {
+ sdl->sdl_alen = EUI64_LENGTH;
+ bcopy(&in6->s6_addr[8], LLADDR(sdl), EUI64_LENGTH);
+ }
- /* remove the address. */
- nd6_dad_duplicated(ifa);
+ sdl->sdl_slen = 0;
+ break;
+ }
+ case AF_LINK: {
+ 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;
+ in6->s6_addr[0] = 0xfe;
+ in6->s6_addr[1] = 0x80;
+ if (sdla->sdl_alen == EUI64_LENGTH)
+ 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[11] = 0xff;
+ in6->s6_addr[12] = 0xfe;
+ in6->s6_addr[13] = (uint8_t) lla[3];
+ in6->s6_addr[14] = (uint8_t) lla[4];
+ in6->s6_addr[15] = (uint8_t) lla[5];
+ }
+
+ break;
+ }
+ default:
+ VERIFY(false);
+ break;
+ }
+}
+
+void
+nd6_alt_node_present(struct ifnet *ifp, struct sockaddr_in6 *sin6,
+ struct sockaddr_dl *sdl, int32_t rssi, int lqm, int npm)
+{
+ struct rtentry *rt;
+ struct llinfo_nd6 *ln;
+ struct if_llreach *lr;
+
+ 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);
+ 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_setexpire(ln, 0);
+
+ lr = ln->ln_llreach;
+ if (lr) {
+ IFLR_LOCK(lr);
+ lr->lr_rssi = rssi;
+ lr->lr_lqm = (int32_t) lqm;
+ lr->lr_npm = (int32_t) npm;
+ IFLR_UNLOCK(lr);
+ }
+
+ RT_UNLOCK(rt);
+ RT_REMREF(rt);
+ }
+
+ lck_mtx_unlock(rnh_lock);
+
+ 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)));
+ }
+}
+
+void
+nd6_alt_node_absent(struct ifnet *ifp, struct sockaddr_in6 *sin6)
+{
+ struct rtentry *rt;
+
+ nd6log((LOG_DEBUG, "%s: host route to %s\n", __func__,
+ ip6_sprintf(&sin6->sin6_addr)));
+
+ 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);
+ if (rt != NULL) {
+ RT_LOCK(rt);
+
+ 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;
+ RT_UNLOCK(rt);
+
+ (void) rtrequest_locked(RTM_DELETE, rt_key(rt),
+ (struct sockaddr *)NULL, rt_mask(rt), 0,
+ (struct rtentry **)NULL);
+
+ rtfree_locked(rt);
+ } else {
+ RT_REMREF_LOCKED(rt);
+ RT_UNLOCK(rt);
+ }
+ }
+
+ lck_mtx_unlock(rnh_lock);
}
projects / apple / xnu.git / blobdiff