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gems-kernel/source/THIRDPARTY/xnu/bsd/netinet6/nd6_nbr.c
Sam Sneed f5727805f2 add darwin/xnu functionality
2024-06-03 11:29:39 -05:00

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/*
* Copyright (c) 2000-2022 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.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/errno.h>
#include <sys/syslog.h>
#include <sys/sysctl.h>
#include <sys/mcache.h>
#include <sys/protosw.h>
#include <kern/queue.h>
#include <dev/random/randomdev.h>
#include <kern/locks.h>
#include <kern/zalloc.h>
#include <net/if.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 <net/dlil.h>
#include <net/nwk_wq.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>
#if IPSEC
#include <netinet6/ipsec.h>
#include <netinet6/ipsec6.h>
#endif
#include <net/sockaddr_utils.h>
struct dadq;
static struct dadq *nd6_dad_find(struct ifaddr *, struct nd_opt_nonce *);
void nd6_dad_stoptimer(struct ifaddr *);
static void nd6_dad_timer(struct ifaddr *);
static void nd6_dad_ns_output(struct dadq *, struct ifaddr *);
static void nd6_dad_ns_input(struct ifaddr *, char *, int, struct nd_opt_nonce *);
static struct mbuf *nd6_dad_na_input(struct mbuf *, struct ifnet *,
struct in6_addr *, caddr_t, int);
static void dad_addref(struct dadq *, int);
static void dad_remref(struct dadq *);
static struct dadq *nd6_dad_attach(struct dadq *, struct ifaddr *);
static void nd6_dad_detach(struct dadq *, struct ifaddr *);
static void nd6_dad_duplicated(struct ifaddr *);
static int dad_maxtry = 15; /* max # of *tries* to transmit DAD packet */
#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)
static LCK_MTX_DECLARE_ATTR(dad6_mutex, &ip6_mutex_grp, &ip6_mutex_attr);
static struct sockaddr_in6 hostrtmask;
static int nd6_llreach_base = 30; /* seconds */
SYSCTL_DECL(_net_inet6_icmp6);
SYSCTL_INT(_net_inet6_icmp6, OID_AUTO, nd6_llreach_base,
CTLFLAG_RW | CTLFLAG_LOCKED, &nd6_llreach_base, 0,
"default ND6 link-layer reachability max lifetime (in seconds)");
int dad_enhanced = ND6_DAD_ENHANCED_DEFAULT;
SYSCTL_DECL(_net_inet6_ip6);
SYSCTL_INT(_net_inet6_ip6, OID_AUTO, dad_enhanced, CTLFLAG_RW | CTLFLAG_LOCKED,
&dad_enhanced, 0,
"Enable Enhanced DAD, which adds a random nonce to NS messages for DAD.");
static uint32_t nd6_dad_nonce_max_count = 3;
SYSCTL_UINT(_net_inet6_ip6, OID_AUTO, nd6_dad_nonce_max_count,
CTLFLAG_RW | CTLFLAG_LOCKED, &nd6_dad_nonce_max_count, 0, "Number of times to ignore same nonce for DAD");
#if DEBUG || DEVELOPMENT
static int ip6_p2p_debug = 0;
SYSCTL_INT(_net_inet6_ip6, OID_AUTO, ip6_p2p_debug, CTLFLAG_RW | CTLFLAG_LOCKED,
&ip6_p2p_debug, 0,
"Enable more instrumentation for IPv6 P2P use-case");
#endif
/*
* 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 || (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(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 nd_neighbor_solicit *nd_ns = NULL;
struct in6_addr saddr6 = ip6->ip6_src;
struct in6_addr daddr6 = ip6->ip6_dst;
uint32_t saddr_ifscope = IN6_IS_SCOPE_EMBED(&saddr6) ? ip6_input_getsrcifscope(m) : IFSCOPE_NONE;
struct in6_addr taddr6 = {};
struct in6_addr myaddr6 = {};
uint32_t myaddr_ifscope = IFSCOPE_NONE;
char *lladdr = NULL;
struct ifaddr *ifa = NULL;
int lladdrlen = 0;
int anycast = 0, proxy = 0, dadprogress = 0;
int tlladdr = 0;
union nd_opts ndopts = {};
struct sockaddr_dl proxydl = {};
boolean_t advrouter = FALSE;
boolean_t is_dad_probe = FALSE;
int oflgclr = 0;
uint32_t taddr_ifscope;
/* Expect 32-bit aligned data pointer on strict-align platforms */
MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
IP6_EXTHDR_CHECK(m, off, icmp6len, return );
ip6 = mtod(m, struct ip6_hdr *);
nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off);
m->m_pkthdr.pkt_flags |= PKTF_INET6_RESOLVE;
taddr6 = nd_ns->nd_ns_target;
if (in6_setscope(&taddr6, ifp, &taddr_ifscope) != 0) {
goto bad;
}
if (ip6->ip6_hlim != IPV6_MAXHLIM) {
nd6log(error,
"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;
}
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 {
nd6log(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.
*/
SOCKADDR_ZERO(&src_sa6, sizeof(src_sa6));
src_sa6.sin6_family = AF_INET6;
src_sa6.sin6_len = sizeof(src_sa6);
src_sa6.sin6_addr = saddr6;
if (!in6_embedded_scope) {
src_sa6.sin6_scope_id = saddr_ifscope;
}
if (!nd6_is_addr_neighbor(&src_sa6, ifp, 0)) {
nd6log(info, "nd6_ns_input: "
"NS packet from non-neighbor\n");
goto bad;
}
}
if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
nd6log(info, "nd6_ns_input: bad NS target (multicast)\n");
goto bad;
}
icmp6len -= sizeof(*nd_ns);
nd6_option_init(nd_ns + 1, icmp6len, &ndopts);
if (nd6_options(&ndopts) < 0) {
nd6log(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);
lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
}
if (is_dad_probe && lladdr) {
nd6log(info, "nd6_ns_input: bad DAD packet "
"(link-layer address option)\n");
goto bad;
}
/*
* Attaching target link-layer address to the NA?
* (RFC 2461 7.2.4)
*
* NS IP dst is unicast/anycast MUST NOT add
* NS IP dst is solicited-node multicast MUST add
*
* In implementation, we add target link-layer address by default.
* We do not add one in MUST NOT cases.
*/
if (!IN6_IS_ADDR_MULTICAST(&daddr6)) {
tlladdr = 0;
} else {
tlladdr = 1;
}
/*
* 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" or "optimistic" address [DAD is in progress].
*/
/* (1) and (3) check. */
ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
/* (2) check. */
if (ifa == NULL) {
struct rtentry *rt;
struct sockaddr_in6 tsin6;
SOCKADDR_ZERO(&tsin6, sizeof tsin6);
tsin6.sin6_len = sizeof(struct sockaddr_in6);
tsin6.sin6_family = AF_INET6;
tsin6.sin6_addr = taddr6;
rt = rtalloc1_scoped(SA(&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);
}
}
RT_UNLOCK(rt);
rtfree(rt);
}
}
if (ifa == NULL && ip6_forwarding && nd6_prproxy) {
/*
* Is the target address part of the prefix that is being
* proxied and installed on another interface?
*/
ifa = (struct ifaddr *)in6ifa_prproxyaddr(&taddr6, taddr_ifscope);
}
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,
(ndopts.nd_opts_nonce == NULL) ? NULL :
ndopts.nd_opts_nonce->nd_opt_nonce);
}
goto freeit;
}
IFA_LOCK(ifa);
myaddr6 = *IFA_IN6(ifa);
myaddr_ifscope = IFA_SIN6_SCOPE(ifa);
anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST;
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) {
nd6log(info,
"nd6_ns_input: lladdrlen mismatch for %s "
"(if %d, NS packet %d)\n",
ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2);
goto bad;
}
if (in6_are_addr_equal_scoped(&myaddr6, &saddr6, myaddr_ifscope, saddr_ifscope)) {
nd6log(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 DAD in-progress addresses.
*
* src addr how to process?
* --- ---
* multicast of course, invalid (rejected in ip6_input)
* unicast somebody is doing address resolution
* unspec dup address detection
*
* The processing is defined in the "draft standard" RFC 4862 (and by
* RFC 4429, which is a "proposed standard" update to its obsolete
* predecessor, RFC 2462) The reason optimistic DAD is not included
* in RFC 4862 is entirely due to IETF procedural considerations.
*/
if (dadprogress) {
/*
* If source address is unspecified address, it is for
* duplicate address detection.
*
* If not, the packet is for addess resolution;
* silently ignore it when not optimistic
*
* Per RFC 4429 the reply for an optimistic address must
* have the Override flag cleared
*/
if (!is_dad_probe && (dadprogress & IN6_IFF_OPTIMISTIC) != 0) {
oflgclr = 1;
} else {
if (is_dad_probe) {
nd6_dad_ns_input(ifa, lladdr, lladdrlen, ndopts.nd_opts_nonce);
}
goto freeit;
}
}
/* Are we an advertising router on this interface? */
advrouter = (ifp->if_ipv6_router_mode != IPV6_ROUTER_MODE_DISABLED);
/*
* If the source address is unspecified address, entries must not
* be created or updated.
* 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 (is_dad_probe) {
saddr6 = in6addr_linklocal_allnodes;
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 ?
SA(&proxydl) : NULL);
}
goto freeit;
}
nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen,
ND_NEIGHBOR_SOLICIT, 0, NULL);
nd6_na_output(ifp, &saddr6, &taddr6,
((anycast || proxy || !tlladdr || oflgclr) ? 0 : ND_NA_FLAG_OVERRIDE) |
(advrouter ? ND_NA_FLAG_ROUTER : 0) | ND_NA_FLAG_SOLICITED,
tlladdr, proxy ? SA(&proxydl) : NULL);
freeit:
m_freem(m);
if (ifa != NULL) {
ifa_remref(ifa);
}
return;
bad:
nd6log(error, "nd6_ns_input: src=%s\n", ip6_sprintf(&saddr6));
nd6log(error, "nd6_ns_input: dst=%s\n", ip6_sprintf(&daddr6));
nd6log(error, "nd6_ns_input: tgt=%s\n", ip6_sprintf(&taddr6));
icmp6stat.icp6s_badns++;
m_freem(m);
if (ifa != NULL) {
ifa_remref(ifa);
}
}
/*
* 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 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(
struct ifnet *ifp,
const struct in6_addr *daddr6,
const struct in6_addr *taddr6,
struct llinfo_nd6 *ln, /* for source address determination */
uint8_t *nonce) /* duplicated address detection */
{
struct mbuf *m;
struct ip6_hdr *ip6;
struct nd_neighbor_solicit *nd_ns;
struct in6_ifaddr *ia = NULL;
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 route_in6 ro;
struct ip6_out_args ip6oa;
u_int32_t rtflags = 0;
boolean_t is_optimistic = FALSE;
if ((ifp->if_eflags & IFEF_IPV6_ND6ALT) || IN6_IS_ADDR_MULTICAST(taddr6)) {
return;
}
bzero(&ro, sizeof(ro));
bzero(&ip6oa, sizeof(ip6oa));
ip6oa.ip6oa_boundif = ifp->if_index;
ip6oa.ip6oa_flags = IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR |
IP6OAF_AWDL_UNRESTRICTED | IP6OAF_INTCOPROC_ALLOWED |
IP6OAF_MANAGEMENT_ALLOWED;
ip6oa.ip6oa_sotc = SO_TC_UNSPEC;
ip6oa.ip6oa_netsvctype = _NET_SERVICE_TYPE_UNSPEC;
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) {
#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); /* XXXMAC: mac_create_mbuf_linklayer() probably */
if (m && max_linkhdr + maxlen >= MHLEN) {
MCLGET(m, M_DONTWAIT);
if ((m->m_flags & M_EXT) == 0) {
m_free(m);
m = NULL;
}
}
if (m == NULL) {
return;
}
m->m_pkthdr.rcvif = NULL;
if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
m->m_flags |= M_MCAST;
im6o = ip6_allocmoptions(Z_NOWAIT);
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? */
/* fill neighbor solicitation packet */
ip6 = mtod(m, struct ip6_hdr *);
ip6->ip6_flow = 0;
ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
ip6->ip6_vfc |= IPV6_VERSION;
/* ip6->ip6_plen will be set later */
ip6->ip6_nxt = IPPROTO_ICMPV6;
ip6->ip6_hlim = IPV6_MAXHLIM;
if (daddr6) {
ip6->ip6_dst = *daddr6;
ip6_output_setdstifscope(m, ifp->if_index, NULL);
} else {
ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
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;
ip6_output_setdstifscope(m, ifp->if_index, NULL);
if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) {
goto bad;
}
}
if (nonce == NULL) {
/*
* RFC2461 7.2.2:
* "If the source address of the packet prompting the
* solicitation is the same as one of the addresses assigned
* to the outgoing interface, that address SHOULD be placed
* in the IP Source Address of the outgoing solicitation.
* Otherwise, any one of the addresses assigned to the
* interface should be used."
*
* We use the source address for the prompting packet
* (saddr6), if:
* - saddr6 is given from the caller (by giving "ln"), and
* - saddr6 belongs to the outgoing interface.
* Otherwise, we perform the source address selection as usual.
*/
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;
SOCKADDR_ZERO(&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(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 == NULL) {
nd6log(debug,
"nd6_ns_output: no preferred source "
"available: dst=%s\n",
ip6_sprintf(&dst_sa.sin6_addr));
goto bad;
}
if (ia->ia6_flags & IN6_IFF_OPTIMISTIC) {
is_optimistic = TRUE;
nd6log(debug,
"nd6_ns_output: preferred source "
"available is optimistic: dst=%s\n",
ip6_sprintf(&dst_sa.sin6_addr));
}
}
} 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(&src_in, sizeof(src_in));
src = &src_in;
ip6oa.ip6oa_flags &= ~IP6OAF_BOUND_SRCADDR;
}
ip6->ip6_src = *src;
ip6_output_setsrcifscope(m, ifp->if_index, ia);
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;
in6_clearscope(&nd_ns->nd_ns_target); /* XXX */
/*
* Add source link-layer address option.
*
* spec implementation
* --- ---
* DAD packet MUST NOT do not add the option
* Source is optimistic MUST NOT do not add the option
* there's no link layer address:
* impossible do not add the option
* there's link layer address:
* Multicast NS MUST add one add the option
* Unicast NS SHOULD add one add the option
*
* XXX We deviate from RFC 4429 and still use optimistic DAD as source
* for address resolution. However to ensure that we do not interfere
* with neighbor cache entries of other neighbors, we MUST ensure
* that SLLAO is not sent. Also note, sending multicast NS without SLLAO
* is also a deviation from RFC 4861.
*/
if (nonce == NULL && (mac = nd6_ifptomac(ifp)) && !is_optimistic) {
int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
/* 8 byte alignments... */
optlen = (optlen + 7) & ~7;
m->m_pkthdr.len += optlen;
m->m_len += optlen;
icmp6len += optlen;
bzero((caddr_t)nd_opt, optlen);
nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
nd_opt->nd_opt_len = (uint8_t)(optlen >> 3);
bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
}
/*
* Add a Nonce option (RFC 3971) to detect looped back NS messages.
* This behavior is documented as Enhanced Duplicate Address
* Detection in draft-ietf-6man-enhanced-dad-13.
* net.inet6.ip6.dad_enhanced=0 disables this.
*/
if (dad_enhanced != 0 && nonce != NULL && !(ifp->if_flags & IFF_POINTOPOINT)) {
int optlen = sizeof(struct nd_opt_hdr) + ND_OPT_NONCE_LEN;
struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
/* 8-byte alignment is required. */
optlen = (optlen + 7) & ~7;
m->m_pkthdr.len += optlen;
m->m_len += optlen;
icmp6len += optlen;
bzero((caddr_t)nd_opt, optlen);
nd_opt->nd_opt_type = ND_OPT_NONCE;
nd_opt->nd_opt_len = (uint8_t)(optlen >> 3);
bcopy(nonce, (caddr_t)(nd_opt + 1), ND_OPT_NONCE_LEN);
}
ip6->ip6_plen = htons((u_short)icmp6len);
nd_ns->nd_ns_cksum = 0;
nd_ns->nd_ns_cksum
= in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
flags = nonce ? IPV6_UNSPECSRC : 0;
flags |= IPV6_OUTARGS;
/*
* PKTF_{INET,INET6}_RESOLVE_RTR are mutually exclusive, so make
* sure only one of them is set (just in case.)
*/
m->m_pkthdr.pkt_flags &= ~(PKTF_INET_RESOLVE | PKTF_RESOLVE_RTR);
m->m_pkthdr.pkt_flags |= PKTF_INET6_RESOLVE;
/*
* If this is a NS for resolving the (default) router, mark
* the packet accordingly so that the driver can find out,
* in case it needs to perform driver-specific action(s).
*/
if (rtflags & RTF_ROUTER) {
m->m_pkthdr.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);
}
ip6oa.ip6oa_flags |= IP6OAF_SKIP_PF;
ip6oa.ip6oa_flags |= IP6OAF_DONT_FRAG;
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 4861
* Based on RFC 4862 (duplicate address detection)
*
* the following items are not implemented yet:
* - anycast advertisement delay rule (RFC 4861 7.2.7, SHOULD)
* - proxy advertisement delay rule (RFC 4861 7.2.8, last paragraph, "should")
*/
void
nd6_na_input(struct mbuf *m, int off, int icmp6len)
{
struct ifnet *ifp = m->m_pkthdr.rcvif;
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
struct nd_neighbor_advert *nd_na;
struct in6_addr saddr6 = ip6->ip6_src;
struct in6_addr daddr6 = ip6->ip6_dst;
struct in6_addr taddr6;
int flags;
int is_router;
int is_solicited;
int is_override;
char *lladdr = NULL;
int lladdrlen = 0;
struct llinfo_nd6 *ln;
struct rtentry *rt;
struct sockaddr_dl *sdl;
union nd_opts ndopts;
uint64_t timenow;
bool send_nc_alive_kev = false;
if ((ifp->if_eflags & IFEF_IPV6_ND6ALT) != 0) {
nd6log(info, "nd6_na_input: on ND6ALT interface!\n");
goto freeit;
}
/* Expect 32-bit aligned data pointer on strict-align platforms */
MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
if (ip6->ip6_hlim != IPV6_MAXHLIM) {
nd6log(error,
"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;
}
IP6_EXTHDR_CHECK(m, off, icmp6len, return );
ip6 = mtod(m, struct ip6_hdr *);
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);
taddr6 = nd_na->nd_na_target;
if (in6_setscope(&taddr6, ifp, NULL)) {
goto bad; /* XXX: impossible */
}
if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
nd6log(error,
"nd6_na_input: invalid target address %s\n",
ip6_sprintf(&taddr6));
goto bad;
}
if (IN6_IS_ADDR_MULTICAST(&daddr6)) {
if (is_solicited) {
nd6log(error,
"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) {
nd6log(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(info,
"nd6_na_input: lladdrlen mismatch for %s "
"(if %d, NA packet %d)\n",
ip6_sprintf(&taddr6), ifp->if_addrlen,
lladdrlen - 2);
goto bad;
}
}
m = nd6_dad_na_input(m, ifp, &taddr6, lladdr, lladdrlen);
if (m == NULL) {
return;
}
/* Forwarding associated with NDPRF_PRPROXY may apply. */
if (ip6_forwarding && nd6_prproxy) {
nd6_prproxy_na_input(ifp, &saddr6, &daddr6, &taddr6, flags);
}
/*
* 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 ((rt = nd6_lookup(&taddr6, 0, ifp, 0)) == NULL) {
if (!ip6_forwarding || !nd6_prproxy) {
goto freeit;
}
if ((rt = nd6_lookup(&taddr6, 0, NULL, 0)) == NULL) {
goto freeit;
}
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;
}
}
}
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) {
RT_REMREF_LOCKED(rt);
RT_UNLOCK(rt);
goto freeit;
}
/*
* Record link-layer address, and update the state.
*/
sdl->sdl_alen = ifp->if_addrlen;
bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
if (is_solicited) {
send_nc_alive_kev = (rt->rt_flags & RTF_ROUTER) ? true : false;
ND6_CACHE_STATE_TRANSITION(ln, ND6_LLINFO_REACHABLE);
if (ln->ln_expire != 0) {
struct nd_ifinfo *ndi = NULL;
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);
RT_UNLOCK(rt);
lck_mtx_lock(rnh_lock);
nd6_sched_timeout(NULL, NULL);
lck_mtx_unlock(rnh_lock);
RT_LOCK(rt);
}
} else {
ND6_CACHE_STATE_TRANSITION(ln, ND6_LLINFO_STALE);
ln_setexpire(ln, timenow + nd6_gctimer);
}
/*
* Enqueue work item to invoke callback for this
* route entry
*/
route_event_enqueue_nwk_wq_entry(rt, NULL,
ROUTE_LLENTRY_RESOLVED, NULL, TRUE);
if ((ln->ln_router = (short)is_router) != 0) {
struct radix_node_head *rnh = NULL;
struct in6_addr rt_addr = SIN6(rt_key(rt))->sin6_addr;
struct ifnet *rt_ifp = rt->rt_ifp;
struct route_event rt_ev;
route_event_init(&rt_ev, rt, NULL, ROUTE_LLENTRY_RESOLVED);
/*
* This means a router's state has changed from
* non-reachable to probably reachable, and might
* affect the status of associated prefixes..
* We already have a reference on rt. Don't need to
* take one for the unlock/lock.
*/
RT_UNLOCK(rt);
defrouter_set_reachability(&rt_addr, rt_ifp, TRUE);
lck_mtx_lock(rnh_lock);
rnh = rt_tables[AF_INET6];
if (rnh != NULL) {
(void) rnh->rnh_walktree(rnh, route_event_walktree,
(void *)&rt_ev);
}
lck_mtx_unlock(rnh_lock);
lck_mtx_lock(nd6_mutex);
pfxlist_onlink_check();
lck_mtx_unlock(nd6_mutex);
RT_LOCK(rt);
}
} else {
int llchange = 0;
/*
* Check if the link-layer address has changed or not.
*/
if (lladdr == NULL) {
llchange = 0;
} else {
if (sdl->sdl_alen) {
if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen)) {
llchange = 1;
} else {
llchange = 0;
}
} else {
llchange = 1;
}
}
/*
* This is VERY complex. Look at it with care.
*
* override solicit lladdr llchange action
* (L: record lladdr)
*
* 0 0 n -- (2c)
* 0 0 y n (2b) L
* 0 0 y y (1) REACHABLE->STALE
* 0 1 n -- (2c) *->REACHABLE
* 0 1 y n (2b) L *->REACHABLE
* 0 1 y y (1) REACHABLE->STALE
* 1 0 n -- (2a)
* 1 0 y n (2a) L
* 1 0 y y (2a) L *->STALE
* 1 1 n -- (2a) *->REACHABLE
* 1 1 y n (2a) L *->REACHABLE
* 1 1 y y (2a) L *->REACHABLE
*/
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) {
ND6_CACHE_STATE_TRANSITION(ln, 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) */
|| !lladdr) { /* (2c) */
/*
* Update link-local address, if any.
*/
if (lladdr) {
sdl->sdl_alen = ifp->if_addrlen;
bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
}
/*
* If solicited, make the state REACHABLE.
* If not solicited and the link-layer address was
* changed, make it STALE.
*/
if (is_solicited) {
ND6_CACHE_STATE_TRANSITION(ln, ND6_LLINFO_REACHABLE);
if (ln->ln_expire != 0) {
struct nd_ifinfo *ndi = NULL;
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);
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) {
ND6_CACHE_STATE_TRANSITION(ln, ND6_LLINFO_STALE);
ln_setexpire(ln, timenow + nd6_gctimer);
}
}
/*
* XXX
* The above is somewhat convoluted, for now just
* issue a callback for LLENTRY changed.
*/
/* Enqueue work item to invoke callback for this route entry */
if (llchange) {
route_event_enqueue_nwk_wq_entry(rt, NULL,
ROUTE_LLENTRY_CHANGED, NULL, TRUE);
}
/*
* If the router's link-layer address has changed,
* notify routes using this as gateway so they can
* update any cached information.
*/
if (ln->ln_router && is_router && llchange) {
struct radix_node_head *rnh = NULL;
struct in6_addr rt_addr = SIN6(rt_key(rt))->sin6_addr;
struct ifnet *rt_ifp = rt->rt_ifp;
struct route_event rt_ev;
route_event_init(&rt_ev, rt, NULL, ROUTE_LLENTRY_CHANGED);
/*
* This means a router's state has changed from
* non-reachable to probably reachable, and might
* affect the status of associated prefixes..
*
* We already have a valid rt reference here.
* We don't need to take another one for unlock/lock.
*/
RT_UNLOCK(rt);
defrouter_set_reachability(&rt_addr, rt_ifp, TRUE);
lck_mtx_lock(rnh_lock);
rnh = rt_tables[AF_INET6];
if (rnh != NULL) {
(void) rnh->rnh_walktree(rnh, route_event_walktree,
(void *)&rt_ev);
}
lck_mtx_unlock(rnh_lock);
RT_LOCK(rt);
}
}
if (ln->ln_router && !is_router) {
/*
* The peer dropped the router flag.
* Remove the sender from the Default Router List and
* update the Destination Cache entries.
*/
struct nd_defrouter *dr;
struct in6_addr *in6;
struct ifnet *rt_ifp = rt->rt_ifp;
in6 = &SIN6(rt_key(rt))->sin6_addr;
RT_UNLOCK(rt);
lck_mtx_lock(nd6_mutex);
/*
* XXX Handle router lists for route information option
* as well.
*/
dr = defrouter_lookup(NULL, in6, rt_ifp);
if (dr) {
TAILQ_REMOVE(&nd_defrouter_list, dr, dr_entry);
defrtrlist_del(dr, NULL);
NDDR_REMREF(dr); /* remove list reference */
NDDR_REMREF(dr);
lck_mtx_unlock(nd6_mutex);
} else {
lck_mtx_unlock(nd6_mutex);
/*
* Even if the neighbor is not in the
* default router list, the neighbor
* may be used as a next hop for some
* destinations (e.g. redirect case).
* So we must call rt6_flush explicitly.
*/
rt6_flush(&ip6->ip6_src, rt_ifp);
}
RT_LOCK(rt);
}
ln->ln_router = (short)is_router;
}
if (send_nc_alive_kev && (ifp->if_addrlen == IF_LLREACH_MAXLEN)) {
struct kev_msg ev_msg;
struct kev_nd6_ndalive nd6_ndalive;
bzero(&ev_msg, sizeof(ev_msg));
bzero(&nd6_ndalive, sizeof(nd6_ndalive));
ev_msg.vendor_code = KEV_VENDOR_APPLE;
ev_msg.kev_class = KEV_NETWORK_CLASS;
ev_msg.kev_subclass = KEV_ND6_SUBCLASS;
ev_msg.event_code = KEV_ND6_NDALIVE;
nd6_ndalive.link_data.if_family = ifp->if_family;
nd6_ndalive.link_data.if_unit = ifp->if_unit;
strlcpy(nd6_ndalive.link_data.if_name,
ifp->if_name,
sizeof(nd6_ndalive.link_data.if_name));
ev_msg.dv[0].data_ptr = &nd6_ndalive;
ev_msg.dv[0].data_length =
sizeof(nd6_ndalive);
dlil_post_complete_msg(NULL, &ev_msg);
}
RT_LOCK_ASSERT_HELD(rt);
rt->rt_flags &= ~RTF_REJECT;
/* 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 != 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...)
*/
m_hold = ln->ln_hold;
ln->ln_hold = NULL;
for (; m_hold; m_hold = m_hold_next) {
m_hold_next = m_hold->m_nextpkt;
m_hold->m_nextpkt = NULL;
/*
* 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);
}
}
RT_REMREF_LOCKED(rt);
RT_UNLOCK(rt);
m_freem(m);
return;
bad:
icmp6stat.icp6s_badna++;
/* fall through */
freeit:
m_freem(m);
return;
}
/*
* Neighbor advertisement output handling.
*
* Based on RFC 2461
*
* 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_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 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;
bzero(&ro, sizeof(ro));
daddr6 = *daddr6_0; /* make a local copy for modification */
bzero(&ip6oa, sizeof(ip6oa));
ip6oa.ip6oa_boundif = ifp->if_index;
ip6oa.ip6oa_flags = IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR |
IP6OAF_AWDL_UNRESTRICTED | IP6OAF_INTCOPROC_ALLOWED |
IP6OAF_MANAGEMENT_ALLOWED;
ip6oa.ip6oa_sotc = SO_TC_UNSPEC;
ip6oa.ip6oa_netsvctype = _NET_SERVICE_TYPE_UNSPEC;
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) {
#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); /* XXXMAC: mac_create_mbuf_linklayer() probably */
if (m && max_linkhdr + maxlen >= MHLEN) {
MCLGET(m, M_DONTWAIT);
if ((m->m_flags & M_EXT) == 0) {
m_free(m);
m = NULL;
}
}
if (m == NULL) {
return;
}
m->m_pkthdr.rcvif = NULL;
if (IN6_IS_ADDR_MULTICAST(&daddr6)) {
m->m_flags |= M_MCAST;
im6o = ip6_allocmoptions(Z_NOWAIT);
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? */
/* fill neighbor advertisement packet */
ip6 = mtod(m, struct ip6_hdr *);
ip6->ip6_flow = 0;
ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
ip6->ip6_vfc |= IPV6_VERSION;
ip6->ip6_nxt = IPPROTO_ICMPV6;
ip6->ip6_hlim = IPV6_MAXHLIM;
if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
/* reply to DAD */
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_output_setdstifscope(m, ifp->if_index, NULL);
}
SOCKADDR_ZERO(&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.
*/
SOCKADDR_COPY(&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(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);
ip6_output_setsrcifscope(m, ifp->if_index, ia);
if (ia != NULL) {
if (ia->ia6_flags & IN6_IFF_OPTIMISTIC) {
flags &= ~ND_NA_FLAG_OVERRIDE;
}
ifa_remref(&ia->ia_ifa);
}
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;
in6_clearscope(&nd_na->nd_na_target); /* XXX */
/*
* "tlladdr" indicates NS's condition for adding tlladdr or not.
* see nd6_ns_input() for details.
* Basically, if NS packet is sent to unicast/anycast addr,
* target lladdr option SHOULD NOT be included.
*/
if (tlladdr) {
/*
* sdl0 != NULL indicates proxy NA. If we do proxy, use
* lladdr in sdl0. If we are not proxying (sending NA for
* my address) use lladdr configured for the interface.
*/
if (sdl0 == NULL) {
mac = nd6_ifptomac(ifp);
} else if (sdl0->sa_family == AF_LINK) {
struct sockaddr_dl *sdl;
sdl = SDL(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;
m->m_pkthdr.len += optlen;
m->m_len += optlen;
icmp6len += optlen;
bzero((caddr_t)nd_opt, optlen);
nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
nd_opt->nd_opt_len = (uint8_t)(optlen >> 3);
bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
} else {
flags &= ~ND_NA_FLAG_OVERRIDE;
}
ip6->ip6_plen = htons((u_short)icmp6len);
nd_na->nd_na_flags_reserved = flags;
nd_na->nd_na_cksum = 0;
nd_na->nd_na_cksum =
in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
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);
}
ip6oa.ip6oa_flags |= IP6OAF_SKIP_PF;
ip6oa.ip6oa_flags |= IP6OAF_DONT_FRAG;
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(
struct ifnet *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)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_tcount; /* # of trials to send NS */
int dad_ns_ocount; /* NS sent so far */
int dad_ns_icount;
int dad_na_icount;
int dad_ns_lcount; /* looped back NS */
int dad_loopbackprobe; /* probing state for loopback detection */
uint8_t dad_lladdr[ETHER_ADDR_LEN];
uint8_t dad_lladdrlen;
#define ND_OPT_NONCE_LEN32 \
((ND_OPT_NONCE_LEN + sizeof(uint32_t) - 1)/sizeof(uint32_t))
uint32_t dad_nonce[ND_OPT_NONCE_LEN32];
uint32_t dad_same_nonce_count; /* # of consecutive times we've ignored DAD failure because of optimistic DAD */
};
static KALLOC_TYPE_DEFINE(dad_zone, struct dadq, NET_KT_DEFAULT);
static struct dadq_head dadq;
void
nd6_nbr_init(void)
{
int i;
TAILQ_INIT(&dadq);
SOCKADDR_ZERO(&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(struct ifaddr *ifa, struct nd_opt_nonce *nonce)
{
struct dadq *dp;
boolean_t same_nonce = false;
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_UNLOCK(dp);
continue;
}
/*
* Skip if the nonce matches the received one.
* +2 in the length is required because of type and
* length fields are included in a header.
*/
same_nonce = nonce != NULL &&
nonce->nd_opt_nonce_len == (ND_OPT_NONCE_LEN + 2) / 8 &&
memcmp(&nonce->nd_opt_nonce[0], &dp->dad_nonce[0],
ND_OPT_NONCE_LEN) == 0;
if (same_nonce &&
dp->dad_same_nonce_count <= nd6_dad_nonce_max_count) {
nd6log(error, "%s: a looped back NS message is "
"detected during DAD for if=%s %s. Ignoring.\n",
__func__,
if_name(ifa->ifa_ifp),
ip6_sprintf(IFA_IN6(ifa)));
dp->dad_same_nonce_count++;
dp->dad_ns_lcount++;
++ip6stat.ip6s_dad_loopcount;
DAD_UNLOCK(dp);
continue;
} else if (!same_nonce) {
// Not the same nonce, reset counter
dp->dad_same_nonce_count = 1;
}
DAD_ADDREF_LOCKED(dp);
DAD_UNLOCK(dp);
break;
}
lck_mtx_unlock(&dad6_mutex);
return dp;
}
void
nd6_dad_stoptimer(
struct ifaddr *ifa)
{
untimeout((void (*)(void *))nd6_dad_timer, (void *)ifa);
}
/*
* Start Duplicate Address Detection (DAD) for specified interface address.
*/
void
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;
if (ifa->ifa_ifp == NULL) {
panic("nd6_dad_start: ifa->ifa_ifp == NULL");
}
nd6log2(debug, "%s - %s ifp %s ia6_flags 0x%x\n",
__func__,
ip6_sprintf(&ia->ia_addr.sin6_addr),
if_name(ia->ia_ifp),
ia->ia6_flags);
/*
* If we don't need DAD, don't do it.
* There are several cases:
* - DAD is disabled (ip6_dad_count == 0)
* - the interface address is anycast
*/
IFA_LOCK(&ia->ia_ifa);
if (!(ia->ia6_flags & IN6_IFF_DADPROGRESS)) {
nd6log0(debug,
"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 (!ip6_dad_count || (ia->ia6_flags & IN6_IFF_ANYCAST) != 0) {
ia->ia6_flags &= ~IN6_IFF_DADPROGRESS;
IFA_UNLOCK(&ia->ia_ifa);
return;
}
IFA_UNLOCK(&ia->ia_ifa);
if (!(ifa->ifa_ifp->if_flags & IFF_UP) ||
(ifa->ifa_ifp->if_eflags & IFEF_IPV6_ND6ALT)) {
return;
}
if ((dp = nd6_dad_find(ifa, NULL)) != NULL) {
DAD_REMREF(dp);
/* DAD already in progress */
return;
}
dp = zalloc_flags(dad_zone, Z_WAITOK | Z_ZERO);
lck_mtx_init(&dp->dad_lock, &ifa_mtx_grp, &ifa_mtx_attr);
/* Callee adds one reference for us */
dp = nd6_dad_attach(dp, ifa);
nd6log0(debug, "%s: starting %sDAD %sfor %s\n",
if_name(ifa->ifa_ifp),
(ia->ia6_flags & IN6_IFF_OPTIMISTIC) ? "optimistic " : "",
(tick_delay == NULL) ? "immediately " : "",
ip6_sprintf(&ia->ia_addr.sin6_addr));
/*
* Send NS packet for DAD, ip6_dad_count times.
* Note that we must delay the first transmission, if this is the
* first packet to be sent from the interface after interface
* (re)initialization.
*/
if (tick_delay == NULL) {
u_int32_t retrans;
struct nd_ifinfo *ndi = NULL;
nd6_dad_ns_output(dp, ifa);
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);
timeout((void (*)(void *))nd6_dad_timer, (void *)ifa, retrans);
} else {
int ntick;
if (*tick_delay == 0) {
ntick = random() % (MAX_RTR_SOLICITATION_DELAY * hz);
} else {
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_ns_lcount = dp->dad_loopbackprobe = 0;
VERIFY(!dp->dad_attached);
dp->dad_same_nonce_count = 1;
dp->dad_attached = 1;
dp->dad_lladdrlen = 0;
DAD_ADDREF_LOCKED(dp); /* for caller */
DAD_ADDREF_LOCKED(dp); /* for dadq_head list */
TAILQ_INSERT_TAIL(&dadq, (struct dadq *)dp, dad_list);
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)
{
struct dadq *dp;
dp = nd6_dad_find(ifa, NULL);
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(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 = NULL;
u_int32_t retrans;
/* Sanity check */
if (ia == NULL) {
nd6log0(error, "nd6_dad_timer: called with null parameter\n");
goto done;
}
nd6log2(debug, "%s - %s ifp %s ia6_flags 0x%x\n",
__func__,
ip6_sprintf(&ia->ia_addr.sin6_addr),
if_name(ia->ia_ifp),
ia->ia6_flags);
dp = nd6_dad_find(ifa, NULL);
if (dp == NULL) {
nd6log0(error, "nd6_dad_timer: DAD structure not found\n");
goto done;
}
IFA_LOCK(&ia->ia_ifa);
if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
nd6log0(error, "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_DADPROGRESS) == 0) {
nd6log0(error, "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) {
DAD_UNLOCK(dp);
nd6log0(info, "%s: could not run DAD, driver problem?\n",
if_name(ifa->ifa_ifp));
nd6_dad_detach(dp, ifa);
goto done;
}
/* Need more checks? */
if (dp->dad_ns_ocount < dp->dad_count) {
DAD_UNLOCK(dp);
/*
* We have more NS to go. Send NS packet for DAD.
*/
nd6_dad_ns_output(dp, ifa);
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);
timeout((void (*)(void *))nd6_dad_timer, (void *)ifa, retrans);
} else {
/*
* We have transmitted sufficient number of DAD packets.
* See what we've got.
*/
if (dp->dad_na_icount > 0 || dp->dad_ns_icount) {
/* We've seen NS or NA, means DAD has failed. */
DAD_UNLOCK(dp);
nd6log0(info,
"%s: duplicate IPv6 address %s if:%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() */
#if SKYWALK
SK_NXS_MS_IF_ADDR_GENCNT_INC(ia->ia_ifp);
#endif /* SKYWALK */
} else if (dad_enhanced != 0 &&
dp->dad_ns_lcount > 0 &&
dp->dad_ns_lcount > dp->dad_loopbackprobe &&
dp->dad_same_nonce_count > 0 &&
dp->dad_same_nonce_count > nd6_dad_nonce_max_count) {
dp->dad_loopbackprobe = dp->dad_ns_lcount;
dp->dad_count =
dp->dad_ns_ocount + dad_maxtry - 1;
DAD_UNLOCK(dp);
ndi = ND_IFINFO(ifa->ifa_ifp);
VERIFY(ndi != NULL && ndi->initialized);
lck_mtx_lock(&ndi->lock);
retrans = ndi->retrans * hz / 1000;
lck_mtx_unlock(&ndi->lock);
/*
* Sec. 4.1 in RFC 7527 requires transmission of
* additional probes until the loopback condition
* becomes clear when a looped back probe is detected.
*/
nd6log0(info,
"%s: a looped back NS message is detected during DAD for %s. Another DAD probe is being sent on interface %s.\n",
__func__, ip6_sprintf(&ia->ia_addr.sin6_addr),
if_name(ia->ia_ifp));
/*
* Send an NS immediately and increase dad_count by
* nd6_mmaxtries - 1.
*/
nd6_dad_ns_output(dp, ifa);
timeout((void (*)(void *))nd6_dad_timer, (void *)ifa, retrans);
goto done;
} else {
boolean_t txunsolna;
DAD_UNLOCK(dp);
/*
* We are done with DAD. No NA came, no NS came.
* No duplicate address found.
*/
IFA_LOCK_SPIN(&ia->ia_ifa);
ia->ia6_flags &= ~IN6_IFF_DADPROGRESS;
IFA_UNLOCK(&ia->ia_ifa);
ndi = ND_IFINFO(ifa->ifa_ifp);
VERIFY(ndi != NULL && ndi->initialized);
lck_mtx_lock(&ndi->lock);
txunsolna = (ndi->flags & ND6_IFF_REPLICATED) != 0;
lck_mtx_unlock(&ndi->lock);
if (txunsolna) {
nd6_unsol_na_output(ifa);
}
nd6log0(debug,
"%s: DAD complete for %s - no duplicates found %s\n",
if_name(ifa->ifa_ifp),
ip6_sprintf(&ia->ia_addr.sin6_addr),
txunsolna ? ", tx unsolicited NA with O=1" : ".");
if (dp->dad_ns_lcount > 0) {
nd6log0(debug,
"%s: DAD completed while "
"a looped back NS message is detected "
"during DAD for %s om interface %s\n",
__func__,
ip6_sprintf(&ia->ia_addr.sin6_addr),
if_name(ia->ia_ifp));
}
in6_post_msg(ia->ia_ifp, KEV_INET6_NEW_USER_ADDR, ia,
dp->dad_lladdr);
nd6_dad_detach(dp, ifa);
#if SKYWALK
SK_NXS_MS_IF_ADDR_GENCNT_INC(ia->ia_ifp);
#endif /* SKYWALK */
}
}
done:
if (dp != NULL) {
DAD_REMREF(dp); /* drop our reference */
}
}
static void
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 candisable;
dp = nd6_dad_find(ifa, NULL);
if (dp == NULL) {
log(LOG_ERR, "%s: DAD structure not found.\n", __func__);
return;
}
IFA_LOCK(&ia->ia_ifa);
DAD_LOCK(dp);
nd6log(error, "%s: NS in/out/loopback=%d/%d/%d, NA in=%d\n",
__func__, dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_ns_lcount,
dp->dad_na_icount);
candisable = FALSE;
if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr) &&
!(ia->ia6_flags & IN6_IFF_SECURED)) {
struct in6_addr in6;
struct ifaddr *llifa = NULL;
struct sockaddr_dl *sdl = NULL;
uint8_t *lladdr = dp->dad_lladdr;
uint8_t lladdrlen = dp->dad_lladdrlen;
/*
* To avoid over-reaction, we only apply this logic when we are
* very sure that hardware addresses are supposed to be unique.
*/
switch (ifp->if_type) {
case IFT_BRIDGE:
case IFT_ETHER:
case IFT_FDDI:
case IFT_ATM:
case IFT_IEEE1394:
#ifdef IFT_IEEE80211
case IFT_IEEE80211:
#endif
/*
* Check if our hardware address matches the
* link layer information received in the
* NS/NA
*/
llifa = ifp->if_lladdr;
IFA_LOCK(llifa);
sdl = SDL(llifa->ifa_addr);
if (lladdrlen == sdl->sdl_alen &&
bcmp(lladdr, LLADDR(sdl), lladdrlen) == 0) {
candisable = TRUE;
}
IFA_UNLOCK(llifa);
in6 = ia->ia_addr.sin6_addr;
if (in6_iid_from_hw(ifp, &in6) != 0) {
break;
}
/* Refine decision about whether IPv6 can be disabled */
if (candisable &&
!IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
/*
* Apply this logic only to the embedded MAC
* address form of link-local IPv6 address.
*/
candisable = FALSE;
} else if (lladdr == NULL &&
IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
/*
* We received a NA with no target link-layer
* address option. This means that someone else
* has our address. Mark it as a hardware
* duplicate so we disable IPv6 later on.
*/
candisable = TRUE;
}
break;
default:
break;
}
}
DAD_UNLOCK(dp);
ia->ia6_flags &= ~IN6_IFF_DADPROGRESS;
ia->ia6_flags |= IN6_IFF_DUPLICATED;
in6_event_enqueue_nwk_wq_entry(IN6_ADDR_MARKED_DUPLICATED,
ia->ia_ifa.ifa_ifp, &ia->ia_addr.sin6_addr,
0);
IFA_UNLOCK(&ia->ia_ifa);
/* increment DAD collision counter */
++ip6stat.ip6s_dad_collide;
/* We are done with DAD, with duplicated address found. (failure) */
untimeout((void (*)(void *))nd6_dad_timer, (void *)ifa);
IFA_LOCK(&ia->ia_ifa);
log(LOG_ERR, "%s: DAD complete for %s - duplicate found.\n",
if_name(ifp), ip6_sprintf(&ia->ia_addr.sin6_addr));
IFA_UNLOCK(&ia->ia_ifa);
if (candisable) {
struct nd_ifinfo *ndi = ND_IFINFO(ifp);
log(LOG_ERR, "%s: possible hardware address duplication "
"detected, disabling IPv6 for interface.\n", if_name(ifp));
VERIFY((NULL != ndi) && (TRUE == ndi->initialized));
ndi->flags |= ND6_IFF_IFDISABLED;
/* Make sure to set IFEF_IPV6_DISABLED too */
nd6_if_disable(ifp, TRUE);
}
log(LOG_ERR,
"%s: manual intervention may be required.\n",
if_name(ifp));
/* Send an event to the configuration agent so that the
* duplicate address will be notified to the user and will
* be removed.
*/
in6_post_msg(ifp, KEV_INET6_NEW_USER_ADDR, ia, dp->dad_lladdr);
nd6_dad_detach(dp, ifa);
DAD_REMREF(dp); /* drop our reference */
}
static void
nd6_dad_ns_output(struct dadq *dp, struct ifaddr *ifa)
{
struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
struct ifnet *ifp = ifa->ifa_ifp;
int i = 0;
struct in6_addr taddr6;
DAD_LOCK(dp);
dp->dad_ns_tcount++;
if ((ifp->if_flags & IFF_UP) == 0) {
DAD_UNLOCK(dp);
return;
}
if ((ifp->if_flags & IFF_RUNNING) == 0) {
DAD_UNLOCK(dp);
return;
}
dp->dad_ns_ocount++;
DAD_UNLOCK(dp);
IFA_LOCK_SPIN(&ia->ia_ifa);
taddr6 = ia->ia_addr.sin6_addr;
IFA_UNLOCK(&ia->ia_ifa);
if (dad_enhanced != 0 && !(ifp->if_flags & IFF_POINTOPOINT)) {
for (i = 0; i < ND_OPT_NONCE_LEN32; i++) {
dp->dad_nonce[i] = RandomULong();
}
/*
* XXXHRS: Note that in the case that
* DupAddrDetectTransmits > 1, multiple NS messages with
* different nonces can be looped back in an unexpected
* order. The current implementation recognizes only
* the latest nonce on the sender side. Practically it
* should work well in almost all cases.
*/
}
nd6_ns_output(ifp, NULL, &taddr6, NULL,
(uint8_t *)&dp->dad_nonce[0]);
}
/*
* @brief Called to process DAD NS
*
* @param ifa is the pointer to the interface's address
* @param lladdr is source link layer information
* @param lladdrlen is source's linklayer length
*
* @return void
*/
static void
nd6_dad_ns_input(struct ifaddr *ifa, char *lladdr,
int lladdrlen, struct nd_opt_nonce *ndopt_nonce)
{
struct dadq *dp;
VERIFY(ifa != NULL);
/* Ignore Nonce option when Enhanced DAD is disabled. */
if (dad_enhanced == 0) {
ndopt_nonce = NULL;
}
dp = nd6_dad_find(ifa, ndopt_nonce);
if (dp == NULL) {
return;
}
DAD_LOCK(dp);
++dp->dad_ns_icount;
if (lladdr && lladdrlen >= ETHER_ADDR_LEN) {
memcpy(dp->dad_lladdr, lladdr, ETHER_ADDR_LEN);
/* fine to truncate as it is compared against sdl_alen */
dp->dad_lladdrlen = (uint8_t)lladdrlen;
}
DAD_UNLOCK(dp);
DAD_REMREF(dp);
}
/*
* @brief Called to process received NA for DAD
*
* @param m is the pointer to the packet's mbuf
* @param ifp is the pointer to the interface on which packet
* was receicved.
* @param taddr is pointer to target's IPv6 address
* @param lladdr is target's link layer information
* @param lladdrlen is target's linklayer length
*
* @return NULL if the packet is consumed by DAD processing, else
* pointer to the mbuf.
*/
static struct mbuf *
nd6_dad_na_input(struct mbuf *m, struct ifnet *ifp, struct in6_addr *taddr,
caddr_t lladdr, int lladdrlen)
{
struct ifaddr *ifa = NULL;
struct in6_ifaddr *ia = NULL;
struct dadq *dp = NULL;
struct nd_ifinfo *ndi = NULL;
boolean_t replicated;
ifa = (struct ifaddr *) in6ifa_ifpwithaddr(ifp, taddr);
if (ifa == NULL) {
return m;
}
replicated = FALSE;
/* Get the ND6_IFF_REPLICATED flag. */
ndi = ND_IFINFO(ifp);
if (ndi != NULL && ndi->initialized) {
lck_mtx_lock(&ndi->lock);
replicated = !!(ndi->flags & ND6_IFF_REPLICATED);
lck_mtx_unlock(&ndi->lock);
}
if (replicated) {
nd6log(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 (!(ia->ia6_flags & IN6_IFF_DADPROGRESS)) {
IFA_UNLOCK(ifa);
nd6log(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(error, "%s: ignoring duplicate NA on %s "
"[eh_src != tgtlladdr]\n", __func__, if_name(ifp));
goto done;
}
}
IFA_UNLOCK(ifa);
dp = nd6_dad_find(ifa, NULL);
if (dp == NULL) {
nd6log(info, "%s: no DAD structure for %s on %s.\n",
__func__, ip6_sprintf(taddr), if_name(ifp));
goto done;
}
DAD_LOCK_SPIN(dp);
if (lladdr != NULL && lladdrlen >= ETHER_ADDR_LEN) {
memcpy(dp->dad_lladdr, lladdr, ETHER_ADDR_LEN);
dp->dad_lladdrlen = (uint8_t)lladdrlen;
}
dp->dad_na_icount++;
DAD_UNLOCK(dp);
DAD_REMREF(dp);
/* remove the address. */
nd6log(info,
"%s: duplicate IPv6 address %s [processing NA on %s]\n", __func__,
ip6_sprintf(taddr), if_name(ifp));
done:
IFA_LOCK_ASSERT_NOTHELD(ifa);
ifa_remref(ifa);
m_freem(m);
return NULL;
}
static void
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", __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", __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);
}
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);
SOCKADDR_ZERO(sin6, sizeof(*sin6));
sin6->sin6_len = sizeof *sin6;
sin6->sin6_family = AF_INET6;
SOCKADDR_ZERO(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;
sdl->sdl_nlen = 0;
switch (sa->sa_family) {
case AF_INET6: {
struct sockaddr_in6 *sin6a = SIN6(sa);
struct in6_addr *in6 = &sin6a->sin6_addr;
VERIFY(sa->sa_len == sizeof *sin6);
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);
}
sdl->sdl_slen = 0;
break;
}
case AF_LINK: {
struct sockaddr_dl *sdla = SDL(sa);
struct in6_addr *in6 = &sin6->sin6_addr;
caddr_t lla = LLADDR(sdla);
VERIFY(sa->sa_len <= sizeof(*sdl));
SOCKADDR_COPY(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;
}
}
int
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 = NULL;
struct llinfo_nd6 *ln = NULL;
struct if_llreach *lr = NULL;
int nd6_nc_updated = 0;
const uint32_t temp_embedded_id = sin6->sin6_addr.s6_addr16[1];
const uint32_t temp_ifscope_id = sin6->sin6_scope_id;
if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) {
if (in6_embedded_scope) {
if (temp_embedded_id == 0) {
sin6->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
}
} else if (temp_ifscope_id == 0) {
sin6->sin6_scope_id = ifp->if_index;
}
}
nd6_cache_lladdr(ifp, &sin6->sin6_addr, LLADDR(sdl), sdl->sdl_alen,
ND_NEIGHBOR_ADVERT, 0, &nd6_nc_updated);
LCK_MTX_ASSERT(rnh_lock, LCK_MTX_ASSERT_NOTOWNED);
lck_mtx_lock(rnh_lock);
rt = rtalloc1_scoped_locked(SA(sin6), 1, 0, ifp->if_index);
/* Restore the address that was passed to us */
if (in6_embedded_scope) {
if (temp_embedded_id == 0) {
sin6->sin6_addr.s6_addr16[1] = 0;
}
} else if (temp_ifscope_id == 0) {
sin6->sin6_scope_id = 0;
}
if (rt != NULL) {
RT_LOCK(rt);
VERIFY(rt->rt_flags & RTF_LLINFO);
VERIFY(rt->rt_llinfo);
ln = rt->rt_llinfo;
ND6_CACHE_STATE_TRANSITION(ln, 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));
#if DEBUG || DEVELOPMENT
if (ip6_p2p_debug) {
panic("%s: failed to add/update host route to %s.\n",
__func__, ip6_sprintf(&sin6->sin6_addr));
}
#endif
return EHOSTUNREACH;
}
nd6log(debug, "%s: Successfully added/updated host route to %s [lr=0x%llx]\n",
__func__, ip6_sprintf(&sin6->sin6_addr),
(uint64_t)VM_KERNEL_ADDRPERM(lr));
/*
* nd6_nc_updated not set implies that nothing was updated
* in the neighbor cache. Convey that as EEXIST to callers.
*/
if (nd6_nc_updated == 0) {
return EEXIST;
}
return 0;
}
int
nd6_alt_node_absent(struct ifnet *ifp, struct sockaddr_in6 *sin6, struct sockaddr_dl *sdl)
{
struct rtentry *rt = NULL;
int error = 0;
const uint32_t temp_embedded_id = sin6->sin6_addr.s6_addr16[1];
const uint32_t temp_ifscope_id = sin6->sin6_scope_id;
nd6log(debug, "%s: host route to %s\n", __func__,
ip6_sprintf(&sin6->sin6_addr));
if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) {
if (in6_embedded_scope) {
if (temp_embedded_id == 0) {
sin6->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
}
} else if (temp_ifscope_id == 0) {
sin6->sin6_scope_id = ifp->if_index;
}
}
LCK_MTX_ASSERT(rnh_lock, LCK_MTX_ASSERT_NOTOWNED);
lck_mtx_lock(rnh_lock);
rt = rtalloc1_scoped_locked(SA(sin6), 0, 0, ifp->if_index);
/* Restore the address that was passed to us */
if (in6_embedded_scope) {
if (temp_embedded_id == 0) {
sin6->sin6_addr.s6_addr16[1] = 0;
}
} else if (temp_ifscope_id == 0) {
sin6->sin6_scope_id = 0;
}
if (rt != NULL) {
RT_LOCK(rt);
if (IS_DYNAMIC_DIRECT_HOSTROUTE(rt)) {
/*
* Copy the link layer information in SDL when present
* as it later gets used to issue the kernel event for
* node absence.
*/
if (sdl != NULL && rt->rt_gateway != NULL &&
rt->rt_gateway->sa_family == AF_LINK &&
SDL(rt->rt_gateway)->sdl_len <= sizeof(*sdl)) {
SOCKADDR_COPY(rt->rt_gateway, sdl, SDL(rt->rt_gateway)->sdl_len);
}
rt->rt_flags |= RTF_CONDEMNED;
RT_UNLOCK(rt);
error = rtrequest_locked(RTM_DELETE, rt_key(rt), NULL, rt_mask(rt),
0, (struct rtentry **)NULL);
rtfree_locked(rt);
} else {
error = EHOSTUNREACH;
RT_REMREF_LOCKED(rt);
RT_UNLOCK(rt);
}
} else {
error = EHOSTUNREACH;
}
if (error == 0) {
nd6log(debug, "%s: Successfully deleted host route to %s "
"for interface %s.\n", __func__, ip6_sprintf(&sin6->sin6_addr),
ifp->if_xname);
} else {
nd6log(error, "%s: Failed to delete host route to %s "
"for interface %s with error :%d.\n", __func__,
ip6_sprintf(&sin6->sin6_addr),
ifp->if_xname, error);
}
lck_mtx_unlock(rnh_lock);
return error;
}
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