#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
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;
#define DAD_LOCK_ASSERT_HELD(_dp) \
LCK_MTX_ASSERT(&(_dp)->dad_lock, LCK_MTX_ASSERT_OWNED)
#define DAD_LOCK_ASSERT_NOTHELD(_dp) \
LCK_MTX_ASSERT(&(_dp)->dad_lock, LCK_MTX_ASSERT_NOTOWNED)
#define DAD_LOCK(_dp) \
lck_mtx_lock(&(_dp)->dad_lock)
#define DAD_LOCK_SPIN(_dp) \
lck_mtx_lock_spin(&(_dp)->dad_lock)
#define DAD_CONVERT_LOCK(_dp) do { \
DAD_LOCK_ASSERT_HELD(_dp); \
lck_mtx_convert_spin(&(_dp)->dad_lock); \
} while (0)
#define DAD_UNLOCK(_dp) \
lck_mtx_unlock(&(_dp)->dad_lock)
#define DAD_ADDREF(_dp) \
dad_addref(_dp, 0)
#define DAD_ADDREF_LOCKED(_dp) \
dad_addref(_dp, 1)
#define DAD_REMREF(_dp) \
dad_remref(_dp)
extern lck_mtx_t *dad6_mutex;
extern lck_mtx_t *nd6_mutex;
static int nd6_llreach_base = 30;
static struct sockaddr_in6 hostrtmask;
SYSCTL_DECL(_net_inet6_icmp6);
SYSCTL_INT(_net_inet6_icmp6, OID_AUTO, nd6_llreach_base,
CTLFLAG_RW | CTLFLAG_LOCKED, &nd6_llreach_base, 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.");
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 &&
alen == ifp->if_addrlen) {
struct if_llreach *lr;
const char *why = NULL, *type = "";
RT_CONVERT_LOCK(rt);
if ((lr = ln->ln_llreach) != NULL) {
type = (solicited ? "ND6 advertisement" :
"ND6 unsolicited announcement");
IFLR_LOCK(lr);
if (bcmp(addr, lr->lr_key.addr, alen) != 0) {
IFLR_UNLOCK(lr);
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;
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;
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();
}
}
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;
struct in6_addr taddr6 = {};
struct in6_addr myaddr6 = {};
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;
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, NULL) != 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) {
if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL &&
daddr6.s6_addr32[1] == 0 &&
daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE &&
daddr6.s6_addr8[12] == 0xff) {
;
} 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;
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(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");
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;
}
if (!IN6_IS_ADDR_MULTICAST(&daddr6)) {
tlladdr = 0;
} else {
tlladdr = 1;
}
ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
if (ifa == NULL) {
struct rtentry *rt;
struct sockaddr_in6 tsin6;
bzero(&tsin6, sizeof tsin6);
tsin6.sin6_len = sizeof(struct sockaddr_in6);
tsin6.sin6_family = AF_INET6;
tsin6.sin6_addr = taddr6;
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) {
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) {
ifa = (struct ifaddr *)in6ifa_prproxyaddr(&taddr6);
}
if (ifa == NULL) {
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);
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(&myaddr6, &saddr6)) {
nd6log(info,
"nd6_ns_input: duplicate IP6 address %s\n",
ip6_sprintf(&saddr6));
goto freeit;
}
if (dadprogress) {
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;
}
}
advrouter = (ifp->if_ipv6_router_mode != IPV6_ROUTER_MODE_DISABLED);
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 ?
(struct sockaddr *)&proxydl : NULL);
}
goto freeit;
}
nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen,
ND_NEIGHBOR_SOLICIT, 0);
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 ? (struct sockaddr *)&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);
}
}
void
nd6_ns_output(
struct ifnet *ifp,
const struct in6_addr *daddr6,
const struct in6_addr *taddr6,
struct llinfo_nd6 *ln,
uint8_t *nonce)
{
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;
ip6oa.ip6oa_sotc = SO_TC_UNSPEC;
ip6oa.ip6oa_netsvctype = _NET_SERVICE_TYPE_UNSPEC;
ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF;
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);
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;
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 (daddr6) {
ip6->ip6_dst = *daddr6;
} 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;
if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) {
goto bad;
}
}
if (nonce == NULL) {
struct ip6_hdr *hip6;
struct in6_addr *hsrc = NULL;
if (ln != NULL) {
RT_LOCK(ln->ln_rt);
if (ln->ln_hold != NULL) {
hip6 = mtod(ln->ln_hold, struct ip6_hdr *);
if (sizeof(*hip6) < ln->ln_hold->m_len) {
hsrc = &hip6->ip6_src;
} else {
hsrc = NULL;
}
}
if (ln->ln_llreach != NULL) {
IFLR_LOCK_SPIN(ln->ln_llreach);
ln->ln_llreach->lr_probes++;
IFLR_UNLOCK(ln->ln_llreach);
}
rtflags = ln->ln_rt->rt_flags;
RT_UNLOCK(ln->ln_rt);
}
if (hsrc != NULL && (ia = in6ifa_ifpwithaddr(ifp, hsrc)) &&
(ia->ia6_flags & IN6_IFF_OPTIMISTIC) == 0) {
src = hsrc;
} else {
int error;
struct sockaddr_in6 dst_sa;
bzero(&dst_sa, sizeof(dst_sa));
dst_sa.sin6_family = AF_INET6;
dst_sa.sin6_len = sizeof(dst_sa);
dst_sa.sin6_addr = ip6->ip6_dst;
src = in6_selectsrc(&dst_sa, NULL,
NULL, &ro, NULL, &src_storage, ip6oa.ip6oa_boundif,
&error);
if (src == NULL) {
nd6log(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;
}
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 {
bzero(&src_in, sizeof(src_in));
src = &src_in;
ip6oa.ip6oa_flags &= ~IP6OAF_BOUND_SRCADDR;
}
ip6->ip6_src = *src;
nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
nd_ns->nd_ns_code = 0;
nd_ns->nd_ns_reserved = 0;
nd_ns->nd_ns_target = *taddr6;
in6_clearscope(&nd_ns->nd_ns_target);
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);
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);
}
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);
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;
m->m_pkthdr.pkt_flags &= ~(PKTF_INET_RESOLVE | PKTF_RESOLVE_RTR);
m->m_pkthdr.pkt_flags |= PKTF_INET6_RESOLVE;
if (rtflags & RTF_ROUTER) {
m->m_pkthdr.pkt_flags |= PKTF_RESOLVE_RTR;
}
if (ifp->if_eflags & IFEF_TXSTART) {
(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);
if (ia != NULL) {
IFA_REMREF(&ia->ia_ifa);
}
return;
bad:
m_freem(m);
goto exit;
}
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;
}
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;
}
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");
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;
}
if (ip6_forwarding && nd6_prproxy) {
nd6_prproxy_na_input(ifp, &saddr6, &daddr6, &taddr6, flags);
}
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) {
if (rt->rt_llinfo_purge != NULL) {
rt->rt_llinfo_purge(rt);
}
if (rt->rt_if_ref_fn != NULL) {
rt->rt_if_ref_fn(ifp, 1);
rt->rt_if_ref_fn(rt->rt_ifp, -1);
}
rt->rt_ifp = ifp;
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 (ifp->if_addrlen && !lladdr) {
RT_REMREF_LOCKED(rt);
RT_UNLOCK(rt);
goto freeit;
}
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);
}
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 route_event rt_ev;
route_event_init(&rt_ev, rt, NULL, ROUTE_LLENTRY_RESOLVED);
RT_UNLOCK(rt);
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;
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;
}
}
if (!is_override && (lladdr != NULL && llchange)) {
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
|| (!is_override && (lladdr && !llchange))
|| !lladdr) {
if (lladdr) {
sdl->sdl_alen = ifp->if_addrlen;
bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
}
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);
}
}
if (llchange) {
route_event_enqueue_nwk_wq_entry(rt, NULL,
ROUTE_LLENTRY_CHANGED, NULL, TRUE);
}
if (ln->ln_router && is_router && llchange) {
struct radix_node_head *rnh = NULL;
struct route_event rt_ev;
route_event_init(&rt_ev, rt, NULL, ROUTE_LLENTRY_CHANGED);
RT_UNLOCK(rt);
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) {
struct nd_defrouter *dr;
struct in6_addr *in6;
struct ifnet *rt_ifp = rt->rt_ifp;
in6 = &((struct sockaddr_in6 *)
(void *)rt_key(rt))->sin6_addr;
RT_UNLOCK(rt);
lck_mtx_lock(nd6_mutex);
dr = defrouter_lookup(NULL, in6, rt_ifp);
if (dr) {
TAILQ_REMOVE(&nd_defrouter_list, dr, dr_entry);
defrtrlist_del(dr, NULL);
NDDR_REMREF(dr);
NDDR_REMREF(dr);
lck_mtx_unlock(nd6_mutex);
} else {
lck_mtx_unlock(nd6_mutex);
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;
nd6_llreach_alloc(rt, ifp, LLADDR(sdl), sdl->sdl_alen, TRUE);
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);
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;
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++;
freeit:
m_freem(m);
return;
}
void
nd6_na_output(
struct ifnet *ifp,
const struct in6_addr *daddr6_0,
const struct in6_addr *taddr6,
uint32_t flags,
int tlladdr,
struct sockaddr *sdl0)
{
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;
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;
ip6oa.ip6oa_sotc = SO_TC_UNSPEC;
ip6oa.ip6oa_netsvctype = _NET_SERVICE_TYPE_UNSPEC;
ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF;
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);
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;
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)) {
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;
}
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;
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(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;
ia = in6ifa_ifpwithaddr(ifp, src);
if (ia != NULL) {
if (ia->ia6_flags & IN6_IFF_OPTIMISTIC) {
flags &= ~ND_NA_FLAG_OVERRIDE;
}
IFA_REMREF(&ia->ia_ifa);
}
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);
if (tlladdr) {
if (sdl0 == NULL) {
mac = nd6_ifptomac(ifp);
} else if (sdl0->sa_family == AF_LINK) {
struct sockaddr_dl *sdl;
sdl = (struct sockaddr_dl *)(void *)sdl0;
if (sdl->sdl_alen == ifp->if_addrlen) {
mac = LLADDR(sdl);
}
}
}
if (tlladdr && mac) {
int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
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) {
(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:
case IFT_6LOWPAN:
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;
int dad_attached;
TAILQ_ENTRY(dadq) dad_list;
struct ifaddr *dad_ifa;
int dad_count;
int dad_ns_tcount;
int dad_ns_ocount;
int dad_ns_icount;
int dad_na_icount;
int dad_ns_lcount;
int dad_loopbackprobe;
uint8_t dad_lladdr[ETHER_ADDR_LEN];
uint8_t dad_lladdrlen;
#define ND_OPT_NONCE_LEN32 \
((ND_OPT_NONCE_LEN + sizeof(uint32_t) - 1)/sizeof(uint32_t))
uint32_t dad_nonce[ND_OPT_NONCE_LEN32];
};
static ZONE_DECLARE(dad_zone, "nd6_dad", sizeof(struct dadq), ZC_ZFREE_CLEARMEM);
static struct dadq_head dadq;
void
nd6_nbr_init(void)
{
int i;
TAILQ_INIT(&dadq);
bzero(&hostrtmask, sizeof hostrtmask);
hostrtmask.sin6_family = AF_INET6;
hostrtmask.sin6_len = sizeof hostrtmask;
for (i = 0; i < sizeof hostrtmask.sin6_addr; ++i) {
hostrtmask.sin6_addr.s6_addr[i] = 0xff;
}
}
static struct dadq *
nd6_dad_find(struct ifaddr *ifa, struct nd_opt_nonce *nonce)
{
struct dadq *dp;
lck_mtx_lock(dad6_mutex);
for (dp = dadq.tqh_first; dp; dp = dp->dad_list.tqe_next) {
DAD_LOCK_SPIN(dp);
if (dp->dad_ifa != ifa) {
DAD_UNLOCK(dp);
continue;
}
if (nonce != NULL &&
nonce->nd_opt_nonce_len == (ND_OPT_NONCE_LEN + 2) / 8 &&
memcmp(&nonce->nd_opt_nonce[0], &dp->dad_nonce[0],
ND_OPT_NONCE_LEN) == 0) {
nd6log(error, "%s: a looped back NS message is "
"detected during DAD for %s. Ignoring.\n",
if_name(ifa->ifa_ifp),
ip6_sprintf(IFA_IN6(ifa)));
dp->dad_ns_lcount++;
++ip6stat.ip6s_dad_loopcount;
DAD_UNLOCK(dp);
continue;
}
DAD_ADDREF_LOCKED(dp);
DAD_UNLOCK(dp);
break;
}
lck_mtx_unlock(dad6_mutex);
return dp;
}
void
nd6_dad_stoptimer(
struct ifaddr *ifa)
{
untimeout((void (*)(void *))nd6_dad_timer, (void *)ifa);
}
void
nd6_dad_start(
struct ifaddr *ifa,
int *tick_delay)
{
struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
struct dadq *dp;
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);
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 == NULL) {
panic("nd6_dad_start: ifa->ifa_ifp == NULL");
}
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);
return;
}
dp = zalloc_flags(dad_zone, Z_WAITOK | Z_ZERO);
lck_mtx_init(&dp->dad_lock, ifa_mtx_grp, ifa_mtx_attr);
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));
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);
}
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);
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_attached = 1;
dp->dad_lladdrlen = 0;
DAD_ADDREF_LOCKED(dp);
DAD_ADDREF_LOCKED(dp);
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);
}
}
void
nd6_dad_stop(struct ifaddr *ifa)
{
struct dadq *dp;
dp = nd6_dad_find(ifa, NULL);
if (!dp) {
return;
}
untimeout((void (*)(void *))nd6_dad_timer, (void *)ifa);
nd6_dad_detach(dp, ifa);
DAD_REMREF(dp);
}
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;
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);
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;
}
if (dp->dad_ns_ocount < dp->dad_count) {
DAD_UNLOCK(dp);
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 {
if (dp->dad_na_icount > 0 || dp->dad_ns_icount) {
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);
} else if (dad_enhanced != 0 &&
dp->dad_ns_lcount > 0 &&
dp->dad_ns_lcount > dp->dad_loopbackprobe) {
dp->dad_loopbackprobe = dp->dad_ns_lcount;
dp->dad_count =
dp->dad_ns_ocount + dad_maxtry - 1;
DAD_UNLOCK(dp);
ndi = ND_IFINFO(ifa->ifa_ifp);
VERIFY(ndi != NULL && ndi->initialized);
lck_mtx_lock(&ndi->lock);
retrans = ndi->retrans * hz / 1000;
lck_mtx_unlock(&ndi->lock);
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));
nd6_dad_ns_output(dp, ifa);
timeout((void (*)(void *))nd6_dad_timer, (void *)ifa, retrans);
goto done;
} else {
boolean_t txunsolna;
DAD_UNLOCK(dp);
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);
}
}
done:
if (dp != NULL) {
DAD_REMREF(dp);
}
}
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;
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
llifa = ifp->if_lladdr;
IFA_LOCK(llifa);
sdl = (struct sockaddr_dl *)(void *)
llifa->ifa_addr;
if (lladdrlen == sdl->sdl_alen &&
bcmp(lladdr, LLADDR(sdl), lladdrlen) == 0) {
candisable = TRUE;
}
IFA_UNLOCK(llifa);
in6 = ia->ia_addr.sin6_addr;
if (in6_iid_from_hw(ifp, &in6) != 0) {
break;
}
if (candisable &&
!IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
candisable = FALSE;
} else if (lladdr == NULL &&
IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
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);
++ip6stat.ip6s_dad_collide;
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;
nd6_if_disable(ifp, TRUE);
}
log(LOG_ERR,
"%s: manual intervention may be required.\n",
if_name(ifp));
in6_post_msg(ifp, KEV_INET6_NEW_USER_ADDR, ia, dp->dad_lladdr);
nd6_dad_detach(dp, ifa);
DAD_REMREF(dp);
}
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();
}
}
nd6_ns_output(ifp, NULL, &taddr6, NULL,
(uint8_t *)&dp->dad_nonce[0]);
}
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);
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);
dp->dad_lladdrlen = (uint8_t)lladdrlen;
}
DAD_UNLOCK(dp);
DAD_REMREF(dp);
}
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;
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;
}
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;
}
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);
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\n", __func__, dp);
}
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);
}
if ((ifa = dp->dad_ifa) != NULL) {
IFA_REMREF(ifa);
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)
{
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);
bzero(sin6, sizeof(*sin6));
sin6->sin6_len = sizeof *sin6;
sin6->sin6_family = AF_INET6;
bzero(sdl, sizeof(*sdl));
sdl->sdl_len = sizeof *sdl;
sdl->sdl_family = AF_LINK;
sdl->sdl_type = ifp->if_type;
sdl->sdl_index = ifp->if_index;
switch (sa->sa_family) {
case AF_INET6: {
struct sockaddr_in6 *sin6a = (struct sockaddr_in6 *)(void *)sa;
struct in6_addr *in6 = &sin6a->sin6_addr;
VERIFY(sa->sa_len == sizeof *sin6);
VERIFY(strlen(ifp->if_name) <= IFNAMSIZ);
sdl->sdl_nlen = (u_char)strlen(ifp->if_name);
bcopy(ifp->if_name, sdl->sdl_data, sdl->sdl_nlen);
if (in6->s6_addr[11] == 0xff && in6->s6_addr[12] == 0xfe) {
sdl->sdl_alen = ETHER_ADDR_LEN;
LLADDR(sdl)[0] = (in6->s6_addr[8] ^ ND6_EUI64_UBIT);
LLADDR(sdl)[1] = in6->s6_addr[9];
LLADDR(sdl)[2] = in6->s6_addr[10];
LLADDR(sdl)[3] = in6->s6_addr[13];
LLADDR(sdl)[4] = in6->s6_addr[14];
LLADDR(sdl)[5] = in6->s6_addr[15];
} else {
sdl->sdl_alen = EUI64_LENGTH;
bcopy(&in6->s6_addr[8], LLADDR(sdl), EUI64_LENGTH);
}
sdl->sdl_slen = 0;
break;
}
case AF_LINK: {
struct sockaddr_dl *sdla = (struct sockaddr_dl *)(void *)sa;
struct in6_addr *in6 = &sin6->sin6_addr;
caddr_t lla = LLADDR(sdla);
VERIFY(sa->sa_len <= sizeof(*sdl));
bcopy(sa, sdl, sa->sa_len);
sin6->sin6_scope_id = sdla->sdl_index;
if (sin6->sin6_scope_id == 0) {
sin6->sin6_scope_id = ifp->if_index;
}
in6->s6_addr[0] = 0xfe;
in6->s6_addr[1] = 0x80;
if (sdla->sdl_alen == EUI64_LENGTH) {
bcopy(lla, &in6->s6_addr[8], EUI64_LENGTH);
} else {
VERIFY(sdla->sdl_alen == ETHER_ADDR_LEN);
in6->s6_addr[8] = ((uint8_t) lla[0] ^ ND6_EUI64_UBIT);
in6->s6_addr[9] = (uint8_t) lla[1];
in6->s6_addr[10] = (uint8_t) lla[2];
in6->s6_addr[11] = 0xff;
in6->s6_addr[12] = 0xfe;
in6->s6_addr[13] = (uint8_t) lla[3];
in6->s6_addr[14] = (uint8_t) lla[4];
in6->s6_addr[15] = (uint8_t) lla[5];
}
break;
}
default:
VERIFY(false);
break;
}
}
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;
struct llinfo_nd6 *ln;
struct if_llreach *lr = NULL;
const uint16_t temp_embedded_id = sin6->sin6_addr.s6_addr16[1];
if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) &&
(temp_embedded_id == 0)) {
sin6->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
}
nd6_cache_lladdr(ifp, &sin6->sin6_addr, LLADDR(sdl), sdl->sdl_alen,
ND_NEIGHBOR_ADVERT, 0);
LCK_MTX_ASSERT(rnh_lock, LCK_MTX_ASSERT_NOTOWNED);
lck_mtx_lock(rnh_lock);
rt = rtalloc1_scoped_locked((struct sockaddr *)sin6, 1, 0,
ifp->if_index);
if (temp_embedded_id == 0) {
sin6->sin6_addr.s6_addr16[1] = 0;
}
if (rt != NULL) {
RT_LOCK(rt);
VERIFY(rt->rt_flags & RTF_LLINFO);
VERIFY(rt->rt_llinfo);
ln = rt->rt_llinfo;
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));
return EHOSTUNREACH;
} else {
nd6log(debug, "%s: host route to %s [lr=0x%llx]\n",
__func__, ip6_sprintf(&sin6->sin6_addr),
(uint64_t)VM_KERNEL_ADDRPERM(lr));
return 0;
}
}
void
nd6_alt_node_absent(struct ifnet *ifp, struct sockaddr_in6 *sin6, struct sockaddr_dl *sdl)
{
struct rtentry *rt;
const uint16_t temp_embedded_id = sin6->sin6_addr.s6_addr16[1];
nd6log(debug, "%s: host route to %s\n", __func__,
ip6_sprintf(&sin6->sin6_addr));
if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) &&
(temp_embedded_id == 0)) {
sin6->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
}
LCK_MTX_ASSERT(rnh_lock, LCK_MTX_ASSERT_NOTOWNED);
lck_mtx_lock(rnh_lock);
rt = rtalloc1_scoped_locked((struct sockaddr *)sin6, 0, 0,
ifp->if_index);
if (temp_embedded_id == 0) {
sin6->sin6_addr.s6_addr16[1] = 0;
}
if (rt != NULL) {
RT_LOCK(rt);
if (!(rt->rt_flags & (RTF_CLONING | RTF_PRCLONING)) &&
(rt->rt_flags & (RTF_HOST | RTF_LLINFO | RTF_WASCLONED)) ==
(RTF_HOST | RTF_LLINFO | RTF_WASCLONED)) {
if (sdl != NULL && rt->rt_gateway != NULL &&
rt->rt_gateway->sa_family == AF_LINK &&
SDL(rt->rt_gateway)->sdl_len <= sizeof(*sdl)) {
bcopy(rt->rt_gateway, sdl, SDL(rt->rt_gateway)->sdl_len);
}
rt->rt_flags |= RTF_CONDEMNED;
RT_UNLOCK(rt);
(void) rtrequest_locked(RTM_DELETE, rt_key(rt),
(struct sockaddr *)NULL, rt_mask(rt), 0,
(struct rtentry **)NULL);
rtfree_locked(rt);
} else {
RT_REMREF_LOCKED(rt);
RT_UNLOCK(rt);
}
}
lck_mtx_unlock(rnh_lock);
}