+/*
+ * Copyright (c) 2000-2011 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@
+ */
/* $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 $ */
#include <sys/kernel.h>
#include <sys/errno.h>
#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/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/nd6.h>
+#include <netinet6/scope6_var.h>
#include <netinet/icmp6.h>
#if IPSEC
struct dadq;
static struct dadq *nd6_dad_find(struct ifaddr *);
-#ifndef __APPLE__
-static void nd6_dad_starttimer(struct dadq *, int);
-static void nd6_dad_stoptimer(struct dadq *);
-#else
void nd6_dad_stoptimer(struct ifaddr *);
-#endif
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 *);
+static void nd6_dad_na_input(struct ifaddr *, 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;
+extern int in6_get_hw_ifid(struct ifnet *, struct in6_addr *);
+
+static int nd6_llreach_base = (LL_BASE_REACHABLE / 1000); /* seconds */
+
+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)");
+
+#define SIN6(s) ((struct sockaddr_in6 *)s)
+
+/*
+ * Obtain a link-layer source cache entry for the sender.
+ *
+ * NOTE: This is currently only for ND6/Ethernet.
+ */
+void
+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 && rt->rt_ifp != lo_ifp &&
+ 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%d: %s%s for %s\n", ifp->if_name,
+ ifp->if_unit, 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 an Neighbor Solicitation Message.
+ * Input a Neighbor Solicitation Message.
*
* Based on RFC 2461
- * Based on RFC 2462 (duplicated address detection)
+ * Based on RFC 2462 (duplicate address detection)
*/
void
nd6_ns_input(
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 tlladdr;
union nd_opts ndopts;
- struct sockaddr_dl *proxydl = NULL;
+ struct sockaddr_dl proxydl;
#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, off, icmp6len, return);
#endif
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 != 255) {
nd6log((LOG_ERR,
}
if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
- /* dst has to be solicited node multicast address. */
- if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL
+ /* 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) {
+ daddr6.s6_addr32[1] == 0 &&
+ daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE &&
+ daddr6.s6_addr8[12] == 0xff) {
; /* good */
} else {
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;
+
+ /*
+ * 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;
+ }
}
if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
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) {
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) {
nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
"(link-layer address option)\n"));
* 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
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, 0UL);
- 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) {
/*
* We've got an NS packet, and we don't have that adddress
* assigned for us. We MUST silently ignore it.
*/
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)
+ 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) {
nd6log((LOG_INFO,
if (tentative) {
/*
* 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)) {
saddr6 = in6addr_linklocal_allnodes;
- saddr6.s6_addr16[1] = htons(ifp->if_index);
+ if (in6_setscope(&saddr6, ifp, NULL) != 0)
+ goto bad;
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);
+ tlladdr, proxy ? (struct sockaddr *)&proxydl : NULL);
goto freeit;
}
((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE)
| (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0)
| ND_NA_FLAG_SOLICITED,
- tlladdr, (struct sockaddr *)proxydl);
+ tlladdr, proxy ? (struct sockaddr *)&proxydl : NULL);
freeit:
m_freem(m);
+ if (ifa != NULL)
+ IFA_REMREF(ifa);
return;
bad:
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 2462 (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(
const struct in6_addr *daddr6,
const struct in6_addr *taddr6,
struct llinfo_nd6 *ln, /* for source address determination */
- int dad, /* duplicated address detection */
- int locked)
+ 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;
-
+ struct route_in6 ro;
+ struct ip6_out_args ip6oa = { IFSCOPE_NONE, 0 };
+
+ bzero(&ro, sizeof(ro));
+
if (IN6_IS_ADDR_MULTICAST(taddr6))
return;
+ ip6oa.ip6oa_boundif = ifp->if_index;
+
/* estimate the size of message */
maxlen = sizeof(*ip6) + sizeof(*nd_ns);
maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
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 = 255;
+ im6o->im6o_multicast_loop = 0;
}
icmp6len = sizeof(*nd_ns);
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) {
- if (ln && ln->ln_hold)
- m_freem(ln->ln_hold);
- ln->ln_hold = NULL;
- m_freem(m);
- return;
+ 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);
+ }
+ RT_UNLOCK(ln->ln_rt);
+
+ }
+ if (ia != NULL) {
+ IFA_REMREF(&ia->ia_ifa);
+ ia = NULL;
+ }
+ if (hsrc != NULL && (ia = in6ifa_ifpwithaddr(ifp, hsrc))) {
+ src = hsrc;
+ IFA_REMREF(&ia->ia_ifa);
+ ia = NULL;
+ } 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;
}
- 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;
}
+ 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.
if (ipsec_bypass == 0)
(void)ipsec_setsocket(m, NULL);
#endif
- ip6_output(m, NULL, NULL, dad ? IPV6_DADOUTPUT : 0, &im6o, &outif, locked);
+ flags = dad ? IPV6_UNSPECSRC : 0;
+ flags |= IPV6_OUTARGS;
+
+ 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]++;
+
+ if (im6o != NULL)
+ IM6O_REMREF(im6o);
+ if (ro.ro_rt) { /* we don't cache this route. */
+ rtfree(ro.ro_rt);
+ }
+ 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;
}
/*
* Neighbor advertisement input handling.
*
* Based on RFC 2461
- * Based on RFC 2462 (duplicated address detection)
+ * Based on RFC 2462 (duplicate address detection)
*
* the following items are not implemented yet:
* - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
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 ifaddr *ifa = NULL;
struct llinfo_nd6 *ln;
struct rtentry *rt;
struct sockaddr_dl *sdl;
return;
}
#endif
- taddr6 = nd_na->nd_na_target;
+
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)) {
nd6log((LOG_ERR,
*
* Otherwise, process as defined in RFC 2461.
*/
- if (ifa
- && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
- nd6_dad_na_input(ifa);
- goto freeit;
+ if (ifa != NULL) {
+ IFA_LOCK(ifa);
+ if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE) {
+ IFA_UNLOCK(ifa);
+ nd6_dad_na_input(ifa, lladdr, lladdrlen);
+ goto freeit;
+ }
+ IFA_UNLOCK(ifa);
}
/* Just for safety, maybe unnecessary. */
}
/*
- * If no neighbor cache entry is found, NA SHOULD silently be discarded.
+ * If no neighbor cache entry is found, NA SHOULD silently be
+ * discarded.
*/
- rt = nd6_lookup(&taddr6, 0, ifp, 0);
- if ((rt == NULL) ||
- ((ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) ||
- ((sdl = SDL(rt->rt_gateway)) == NULL))
+ if ((rt = nd6_lookup(&taddr6, 0, ifp, 0)) == NULL)
+ goto freeit;
+
+ 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;
+ }
getmicrotime(&timenow);
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.
if (is_solicited) {
ln->ln_state = ND6_LLINFO_REACHABLE;
ln->ln_byhint = 0;
- if (ln->ln_expire)
- ln->ln_expire = timenow.tv_sec +
- nd_ifinfo[rt->rt_ifp->if_index].reachable;
+ if (ln->ln_expire) {
+ lck_rw_lock_shared(nd_if_rwlock);
+ ln->ln_expire = rt_expiry(rt, timenow.tv_sec,
+ nd_ifinfo[rt->rt_ifp->if_index].reachable);
+ lck_rw_done(nd_if_rwlock);
+ }
} else {
ln->ln_state = ND6_LLINFO_STALE;
- ln->ln_expire = timenow.tv_sec + nd6_gctimer;
+ ln->ln_expire = rt_expiry(rt, timenow.tv_sec,
+ nd6_gctimer);
}
if ((ln->ln_router = is_router) != 0) {
/*
* non-reachable to probably reachable, and might
* affect the status of associated prefixes..
*/
- pfxlist_onlink_check(0);
+ 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) {
ln->ln_state = ND6_LLINFO_STALE;
- ln->ln_expire = timenow.tv_sec + nd6_gctimer;
+ ln->ln_expire = rt_expiry(rt, timenow.tv_sec,
+ nd6_gctimer);
}
+ RT_REMREF_LOCKED(rt);
+ RT_UNLOCK(rt);
goto freeit;
} else if (is_override /* (2a) */
|| (!is_override && (lladdr && !llchange)) /* (2b) */
ln->ln_state = ND6_LLINFO_REACHABLE;
ln->ln_byhint = 0;
if (ln->ln_expire) {
- ln->ln_expire = timenow.tv_sec +
- nd_ifinfo[ifp->if_index].reachable;
+ lck_rw_lock_shared(nd_if_rwlock);
+ ln->ln_expire =
+ rt_expiry(rt, timenow.tv_sec,
+ nd_ifinfo[ifp->if_index].reachable);
+ lck_rw_done(nd_if_rwlock);
}
} else {
if (lladdr && llchange) {
ln->ln_state = ND6_LLINFO_STALE;
- ln->ln_expire = timenow.tv_sec + nd6_gctimer;
+ ln->ln_expire = rt_expiry(rt,
+ timenow.tv_sec, nd6_gctimer);
}
}
}
*/
struct nd_defrouter *dr;
struct in6_addr *in6;
+ struct ifnet *rt_ifp = rt->rt_ifp;
in6 = &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr;
* Lock to protect the default router list.
* XXX: this might be unnecessary, since this function
* is only called under the network software interrupt
- * context. However, we keep it just for safety.
+ * context. However, we keep it just for safety.
*/
+ RT_UNLOCK(rt);
lck_mtx_lock(nd6_mutex);
- dr = defrouter_lookup(in6, rt->rt_ifp);
+ dr = defrouter_lookup(in6, rt_ifp);
if (dr) {
- defrtrlist_del(dr, 1);
+ defrtrlist_del(dr);
+ NDDR_REMREF(dr);
lck_mtx_unlock(nd6_mutex);
}
else {
lck_mtx_unlock(nd6_mutex);
- if (!ip6_forwarding && (ip6_accept_rtadv || (rt->rt_ifp->if_eflags & IFEF_ACCEPT_RTADVD))) {
+ if (!ip6_forwarding && (ip6_accept_rtadv || (rt_ifp->if_eflags & IFEF_ACCEPT_RTADVD))) {
/*
* Even if the neighbor is not in the default
* router list, the neighbor may be used
* (e.g. redirect case). So we must
* call rt6_flush explicitly.
*/
- rt6_flush(&ip6->ip6_src, rt->rt_ifp);
+ rt6_flush(&ip6->ip6_src, rt_ifp);
}
}
+ 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 (ln->ln_hold != NULL) {
+ struct mbuf *m_hold, *m_hold_next;
+ struct sockaddr_in6 sin6;
+
+ rtkey_to_sa6(rt, &sin6);
/*
- * we assume ifp is not a loopback here, so just set the 2nd
- * argument as the 1st one.
+ * reset the ln_hold in advance, to explicitly
+ * prevent a ln_hold lookup in nd6_output()
+ * (wouldn't happen, though...)
*/
- nd6_output(ifp, ifp, ln->ln_hold,
- (struct sockaddr_in6 *)rt_key(rt), rt, 0);
- ln->ln_hold = 0;
+ 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);
+ RT_LOCK_SPIN(rt);
+ }
+ ln->ln_hold = NULL;
+
}
+ RT_REMREF_LOCKED(rt);
+ RT_UNLOCK(rt);
- freeit:
+freeit:
m_freem(m);
+ if (ifa != NULL)
+ IFA_REMREF(ifa);
return;
- bad:
+bad:
icmp6stat.icp6s_badna++;
m_freem(m);
+ if (ifa != NULL)
+ IFA_REMREF(ifa);
}
/*
* 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(
struct ifnet *ifp,
- const struct in6_addr *daddr6,
+ const struct in6_addr *daddr6_0,
const struct in6_addr *taddr6,
- u_long flags,
+ 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;
+ struct ip6_moptions *im6o = NULL;
caddr_t mac = NULL;
- struct ifnet *outif = NULL;
+ struct route_in6 ro;
+ struct in6_addr *src, src_storage, daddr6;
+ struct sockaddr_in6 dst_sa;
+ int icmp6len, maxlen, error;
+ struct ifnet *outif = NULL;
+ struct ip6_out_args ip6oa = { IFSCOPE_NONE, 0 };
+
+ bzero(&ro, sizeof(ro));
+
+ daddr6 = *daddr6_0; /* make a local copy for modification */
+
+ ip6oa.ip6oa_boundif = ifp->if_index;
/* estimate the size of message */
maxlen = sizeof(*ip6) + sizeof(*nd_na);
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 = 255;
+ im6o->im6o_multicast_loop = 0;
}
icmp6len = sizeof(*nd_na);
ip6->ip6_vfc |= IPV6_VERSION;
ip6->ip6_nxt = IPPROTO_ICMPV6;
ip6->ip6_hlim = 255;
- if (IN6_IS_ADDR_UNSPECIFIED(daddr6)) {
+ 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 = ia->ia_addr.sin6_addr;
+ ip6->ip6_src = *src;
+
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.
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;
if (ipsec_bypass == 0)
(void)ipsec_setsocket(m, NULL);
#endif
- ip6_output(m, NULL, NULL, 0, &im6o, &outif, 0);
+ 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]++;
+
+ if (im6o != NULL)
+ IM6O_REMREF(im6o);
+ if (ro.ro_rt) {
+ rtfree(ro.ro_rt);
+ }
+ return;
+
+bad:
+ if (im6o != NULL)
+ IM6O_REMREF(im6o);
+ if (ro.ro_rt) {
+ rtfree(ro.ro_rt);
+ }
+ m_freem(m);
+ return;
}
caddr_t
nd6_ifptomac(
struct ifnet *ifp)
{
- return ((caddr_t)ifnet_lladdr(ifp));
+ switch (ifp->if_type) {
+ case IFT_ARCNET:
+ case IFT_ETHER:
+ case IFT_IEEE8023ADLAG:
+ case IFT_FDDI:
+ case IFT_IEEE1394:
+#ifdef IFT_L2VLAN
+ case IFT_L2VLAN:
+#endif
+#ifdef IFT_IEEE80211
+ case IFT_IEEE80211:
+#endif
+#ifdef IFT_CARP
+ case IFT_CARP:
+#endif
+ case IFT_BRIDGE:
+ case IFT_ISO88025:
+ return ((caddr_t)ifnet_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;
+ int dad_na_ixcount; /* Count of IFDISABLED eligible NA rx'd */
};
static struct dadq_head dadq;
-static int dad_init = 0;
+
+void
+nd6_nbr_init(void)
+{
+ 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);
+}
static struct dadq *
-nd6_dad_find(
- 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) {
+ DAD_LOCK_SPIN(dp);
if (dp->dad_ifa == ifa) {
+ DAD_ADDREF_LOCKED(dp);
+ DAD_UNLOCK(dp);
lck_mtx_unlock(dad6_mutex);
- return dp;
+ return (dp);
}
+ DAD_UNLOCK(dp);
}
lck_mtx_unlock(dad6_mutex);
- return NULL;
+ return (NULL);
}
-#ifdef __APPLE__
void
nd6_dad_stoptimer(
struct ifaddr *ifa)
untimeout((void (*)(void *))nd6_dad_timer, (void *)ifa);
}
-#else
-static void
-nd6_dad_starttimer(
- struct dadq *dp,
- int ticks)
-{
-
- callout_reset(&dp->dad_timer_ch, ticks,
- (void (*)(void *))nd6_dad_timer, (void *)dp->dad_ifa);
-}
-
-static void
-nd6_dad_stoptimer(
- struct dadq *dp)
-{
-
- callout_stop(&dp->dad_timer_ch);
-}
-#endif
/*
- * Start Duplicated Address Detection (DAD) for specified interface address.
+ * Start Duplicate Address Detection (DAD) for specified interface address.
*/
void
nd6_dad_start(
struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
struct dadq *dp;
- if (!dad_init) {
- TAILQ_INIT(&dadq);
- dad_init++;
- }
-
/*
* If we don't need DAD, don't do it.
* There are several cases:
* - DAD is disabled (ip6_dad_count == 0)
* - the interface address is anycast
*/
+ IFA_LOCK(&ia->ia_ifa);
if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) {
log(LOG_DEBUG,
"nd6_dad_start: called with non-tentative 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;
+ IFA_UNLOCK(&ia->ia_ifa);
return;
}
if (!ip6_dad_count) {
ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
+ 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)) {
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));
- lck_mtx_lock(dad6_mutex);
- TAILQ_INSERT_TAIL(&dadq, (struct dadq *)dp, dad_list);
- lck_mtx_unlock(dad6_mutex);
+ bzero(dp, dad_size);
+ lck_mtx_init(&dp->dad_lock, ifa_mtx_grp, ifa_mtx_attr);
+
+ /* Callee adds one reference for us */
+ dp = nd6_dad_attach(dp, ifa);
nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
ip6_sprintf(&ia->ia_addr.sin6_addr)));
* first packet to be sent from the interface after interface
* (re)initialization.
*/
- dp->dad_ifa = ifa;
- ifaref(ifa); /*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_delay == NULL) {
+ u_int32_t retrans;
nd6_dad_ns_output(dp, ifa);
- timeout((void (*)(void *))nd6_dad_timer, (void *)ifa,
- nd_ifinfo[ifa->ifa_ifp->if_index].retrans * hz / 1000);
+ lck_rw_lock_shared(nd_if_rwlock);
+ retrans = nd_ifinfo[ifa->ifa_ifp->if_index].retrans * hz / 1000;
+ lck_rw_done(nd_if_rwlock);
+ timeout((void (*)(void *))nd6_dad_timer, (void *)ifa, retrans);
} else {
int 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_na_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_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)
+nd6_dad_stop(struct ifaddr *ifa)
{
struct dadq *dp;
- if (!dad_init)
- return;
dp = nd6_dad_find(ifa);
if (!dp) {
/* DAD wasn't started yet */
untimeout((void (*)(void *))nd6_dad_timer, (void *)ifa);
- lck_mtx_lock(dad6_mutex);
- TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
- lck_mtx_unlock(dad6_mutex);
- FREE(dp, M_IP6NDP);
- dp = NULL;
- ifafree(ifa);
+ nd6_dad_detach(dp, ifa);
+ DAD_REMREF(dp); /* drop our reference */
}
static void
-nd6_dad_timer(
- struct ifaddr *ifa)
+nd6_unsol_na_output(struct ifaddr *ifa)
{
struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
- struct dadq *dp;
+ struct ifnet *ifp = ifa->ifa_ifp;
+ struct in6_addr saddr6, taddr6;
+
+ if ((ifp->if_flags & IFF_UP) == 0 ||
+ (ifp->if_flags & IFF_RUNNING) == 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;
/* Sanity check */
if (ia == 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) {
"%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) {
+ DAD_UNLOCK(dp);
nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n",
if_name(ifa->ifa_ifp)));
- lck_mtx_lock(dad6_mutex);
- TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
- lck_mtx_unlock(dad6_mutex);
- 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);
- timeout((void (*)(void *))nd6_dad_timer, (void *)ifa,
- nd_ifinfo[ifa->ifa_ifp->if_index].retrans * hz / 1000);
+ lck_rw_lock_shared(nd_if_rwlock);
+ retrans = nd_ifinfo[ifa->ifa_ifp->if_index].retrans * hz / 1000;
+ lck_rw_done(nd_if_rwlock);
+ timeout((void (*)(void *))nd6_dad_timer, (void *)ifa, retrans);
} else {
/*
* We have transmitted sufficient number of DAD packets.
}
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;
- nd6_dad_duplicated(ifa);
+ nd6_dad_duplicated(ifa, TRUE);
} else {
/*
* We are done with DAD. No NA came, no NS came.
- * duplicated address found.
+ * No duplicate address found.
*/
+ IFA_LOCK_SPIN(&ia->ia_ifa);
ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
+ IFA_UNLOCK(&ia->ia_ifa);
nd6log((LOG_DEBUG,
"%s: DAD complete for %s - no duplicates found\n",
if_name(ifa->ifa_ifp),
ip6_sprintf(&ia->ia_addr.sin6_addr)));
-
- lck_mtx_lock(dad6_mutex);
- TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
- lck_mtx_unlock(dad6_mutex);
+ /*
+ * 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);
- FREE(dp, M_IP6NDP);
- dp = NULL;
- ifafree(ifa);
+ nd6_dad_detach(dp, ifa);
}
}
done:
- return;
+ if (dp != NULL)
+ DAD_REMREF(dp); /* drop our reference */
}
void
-nd6_dad_duplicated(
- struct ifaddr *ifa)
+nd6_dad_duplicated(struct ifaddr *ifa, boolean_t dontignhwdup)
{
struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
struct dadq *dp;
+ struct ifnet *ifp = ifa->ifa_ifp;
+ int hwdupposs;
dp = nd6_dad_find(ifa);
if (dp == NULL) {
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\n",
- if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr),
- dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount);
-
+ "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;
+ DAD_UNLOCK(dp);
ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
ia->ia6_flags |= IN6_IFF_DUPLICATED;
+ IFA_UNLOCK(&ia->ia_ifa);
/* 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",
- if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr));
+ if_name(ifp), ip6_sprintf(&ia->ia_addr.sin6_addr));
log(LOG_ERR, "%s: manual intervention required\n",
- if_name(ifa->ifa_ifp));
-
- lck_mtx_lock(dad6_mutex);
- TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
- lck_mtx_unlock(dad6_mutex);
- FREE(dp, M_IP6NDP);
- dp = NULL;
- ifafree(ifa);
+ if_name(ifp));
+ IFA_UNLOCK(&ia->ia_ifa);
+
+ if (hwdupposs ||
+ (dontignhwdup && IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr))) {
+ 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);
+ }
+
+ /* 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);
+ nd6_dad_detach(dp, ifa);
+ DAD_REMREF(dp); /* drop our reference */
}
static void
-nd6_dad_ns_output(
- 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, 0);
+ 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(
- struct ifaddr *ifa)
+nd6_dad_ns_input(struct ifaddr *ifa)
{
- struct in6_ifaddr *ia;
- const struct in6_addr *taddr6;
struct dadq *dp;
int duplicate;
+ struct ifnet *ifp;
- if (!ifa)
+ if (ifa == NULL)
panic("ifa == NULL in nd6_dad_ns_input");
- ia = (struct in6_ifaddr *)ifa;
- taddr6 = &ia->ia_addr.sin6_addr;
+ ifp = ifa->ifa_ifp;
duplicate = 0;
dp = nd6_dad_find(ifa);
/* 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(taddr6),
+ "address %s(%s)\n", ip6_sprintf(&ia->ia_addr.sin6_addr),
if_name(ifa->ifa_ifp)));
+ IFA_UNLOCK(&ia->ia_ifa);
return;
}
* if I'm yet to start DAD, someone else started using this address
* first. I have a duplicate and you win.
*/
- if (!dp || dp->dad_ns_ocount == 0)
+ 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) {
- dp = NULL; /* will be freed in nd6_dad_duplicated() */
- nd6_dad_duplicated(ifa);
- } else {
+ 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.
*/
- if (dp)
- dp->dad_ns_icount++;
+ dp->dad_ns_icount++;
+ DAD_UNLOCK(dp);
+ DAD_REMREF(dp);
}
}
static void
-nd6_dad_na_input(
- struct ifaddr *ifa)
+nd6_dad_na_input(struct ifaddr *ifa, caddr_t lladdr, int lladdrlen)
{
+ struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
struct dadq *dp;
+ int hwdupposs;
- if (!ifa)
+ if (ifa == NULL)
panic("ifa == NULL in nd6_dad_na_input");
dp = nd6_dad_find(ifa);
- if (dp)
- dp->dad_na_icount++;
-
+ if (dp == NULL) {
+ log(LOG_ERR, "nd6_dad_na_input: DAD structure not found\n");
+ return;
+ }
+
+ /*
+ * 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;
+ IFA_LOCK(ifa);
+ if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) {
+ struct ifnet *ifp;
+ struct in6_addr in6;
+
+ 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 *)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;
+ }
+ IFA_UNLOCK(ifa);
+ break;
+ default:
+ break;
+ }
+ } else {
+ IFA_UNLOCK(ifa);
+ }
+
+ DAD_LOCK_SPIN(dp);
+ dp->dad_na_icount++;
+ if (hwdupposs)
+ dp->dad_na_ixcount++;
+ DAD_UNLOCK(dp);
+ DAD_REMREF(dp);
+
/* remove the address. */
- nd6_dad_duplicated(ifa);
+ nd6_dad_duplicated(ifa, FALSE);
+}
+
+static void
+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)
+{
+ /* Nothing more to do if it's disabled */
+ if (nd6_llreach_base == 0)
+ return;
+
+ ifnet_llreach_set_reachable(ifp, ETHERTYPE_IPV6, addr, alen);
}
projects / apple / xnu.git / blobdiff