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diff --git a/sbin/ifconfig/af_inet6.c b/sbin/ifconfig/af_inet6.c
--- a/sbin/ifconfig/af_inet6.c
+++ b/sbin/ifconfig/af_inet6.c
@@ -706,6 +706,8 @@
DEF_CMD("-accept_rtadv",-ND6_IFF_ACCEPT_RTADV, setnd6flags),
DEF_CMD("no_radr", ND6_IFF_NO_RADR, setnd6flags),
DEF_CMD("-no_radr", -ND6_IFF_NO_RADR, setnd6flags),
+ DEF_CMD("no_prefixaddr",ND6_IFF_NO_PREFIXADDR, setnd6flags),
+ DEF_CMD("-no_prefixaddr",-ND6_IFF_NO_PREFIXADDR,setnd6flags),
DEF_CMD("defaultif", 1, setnd6defif),
DEF_CMD("-defaultif", -1, setnd6defif),
DEF_CMD("ifdisabled", ND6_IFF_IFDISABLED, setnd6flags),
diff --git a/sbin/ifconfig/af_nd6.c b/sbin/ifconfig/af_nd6.c
--- a/sbin/ifconfig/af_nd6.c
+++ b/sbin/ifconfig/af_nd6.c
@@ -66,6 +66,7 @@
[9] = "IPV6_ONLY",
[10] = "IPV6_ONLY_MANUAL",
#endif
+ [11] = "NO_PREFIXADDR",
[15] = "DEFAULTIF",
};
diff --git a/sbin/ifconfig/ifconfig.8 b/sbin/ifconfig/ifconfig.8
--- a/sbin/ifconfig/ifconfig.8
+++ b/sbin/ifconfig/ifconfig.8
@@ -28,7 +28,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
-.Dd April 24, 2025
+.Dd May 2, 2025
.Dt IFCONFIG 8
.Os
.Sh NAME
@@ -952,8 +952,32 @@
.Va net.inet6.ip6.no_radr
controls whether this flag is set by default or not.
.It Cm -no_radr
-Clear a flag
-.Cm no_radr .
+Clear the
+.Cm no_radr
+flag.
+.It Cm no_prefixaddr
+Set a flag to control whether a Router Advertisement message including
+an on-link autonomous prefix will result in an IP address in that prefix
+being configured automatically.
+If this flag is set, an address will not be configured, but a route for
+the on-link prefix will be added to the system routing table.
+In this case, the administrator should configure a static IP address.
+The advertised router will still be added to the Default Router List
+unless the
+.Cm no_radr
+flag is also set.
+When the
+.Cm accept_rtadv
+flag is disabled, this flag has no effect.
+The
+.Xr sysctl 8
+variable
+.Va net.inet6.ip6.no_prefixaddr
+controls whether this flag is set by default or not.
+.It Cm -no_prefixaddr
+Clear the
+.Cm no_prefixaddr
+flag.
.It Cm auto_linklocal
Set a flag to perform automatic link-local address configuration when
the interface becomes available.
diff --git a/sys/netinet6/in6_proto.c b/sys/netinet6/in6_proto.c
--- a/sys/netinet6/in6_proto.c
+++ b/sys/netinet6/in6_proto.c
@@ -155,6 +155,7 @@
VNET_DEFINE(int, ip6_defmcasthlim) = IPV6_DEFAULT_MULTICAST_HOPS;
VNET_DEFINE(int, ip6_accept_rtadv) = 0;
VNET_DEFINE(int, ip6_no_radr) = 0;
+VNET_DEFINE(bool, ip6_no_prefixaddr) = 0;
VNET_DEFINE(int, ip6_norbit_raif) = 0;
VNET_DEFINE(int, ip6_rfc6204w3) = 0;
VNET_DEFINE(int, ip6_hdrnestlimit) = 15;/* How many header options will we
@@ -272,6 +273,10 @@
"Default value of per-interface flag to control whether routers "
"sending ICMPv6 RA messages on that interface are added into the "
"default router list");
+SYSCTL_BOOL(_net_inet6_ip6, OID_AUTO, no_prefixaddr,
+ CTLFLAG_VNET | CTLFLAG_RWTUN, &VNET_NAME(ip6_no_prefixaddr), 0,
+ "Default value of per-interface flag to control whether ICMPv6 RA "
+ "messages with a prefix should configure an interface address");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_NORBIT_RAIF, norbit_raif,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_norbit_raif), 0,
"Always set clear the R flag in ICMPv6 NA messages when accepting RA "
diff --git a/sys/netinet6/ip6_input.c b/sys/netinet6/ip6_input.c
--- a/sys/netinet6/ip6_input.c
+++ b/sys/netinet6/ip6_input.c
@@ -230,6 +230,7 @@
&V_ip6_auto_linklocal);
TUNABLE_INT_FETCH("net.inet6.ip6.accept_rtadv", &V_ip6_accept_rtadv);
TUNABLE_INT_FETCH("net.inet6.ip6.no_radr", &V_ip6_no_radr);
+ TUNABLE_BOOL_FETCH("net.inet6.ip6.no_prefixaddr", &V_ip6_no_prefixaddr);
CK_STAILQ_INIT(&V_in6_ifaddrhead);
V_in6_ifaddrhashtbl = hashinit(IN6ADDR_NHASH, M_IFADDR,
diff --git a/sys/netinet6/ip6_var.h b/sys/netinet6/ip6_var.h
--- a/sys/netinet6/ip6_var.h
+++ b/sys/netinet6/ip6_var.h
@@ -313,6 +313,7 @@
VNET_DECLARE(int, ip6_sendredirects); /* send IP redirects when forwarding? */
VNET_DECLARE(int, ip6_accept_rtadv); /* Acts as a host not a router */
VNET_DECLARE(int, ip6_no_radr); /* No defroute from RA */
+VNET_DECLARE(bool, ip6_no_prefixaddr); /* No address from RA */
VNET_DECLARE(int, ip6_norbit_raif); /* Disable R-bit in NA on RA
* receiving IF. */
VNET_DECLARE(int, ip6_rfc6204w3); /* Accept defroute from RA even when
@@ -324,6 +325,7 @@
#define V_ip6_sendredirects VNET(ip6_sendredirects)
#define V_ip6_accept_rtadv VNET(ip6_accept_rtadv)
#define V_ip6_no_radr VNET(ip6_no_radr)
+#define V_ip6_no_prefixaddr VNET(ip6_no_prefixaddr)
#define V_ip6_norbit_raif VNET(ip6_norbit_raif)
#define V_ip6_rfc6204w3 VNET(ip6_rfc6204w3)
#define V_ip6_hdrnestlimit VNET(ip6_hdrnestlimit)
diff --git a/sys/netinet6/nd6.h b/sys/netinet6/nd6.h
--- a/sys/netinet6/nd6.h
+++ b/sys/netinet6/nd6.h
@@ -95,6 +95,7 @@
#define ND6_IFF_IPV6_ONLY_MANUAL 0x400
#define ND6_IFF_IPV6_ONLY_MASK (ND6_IFF_IPV6_ONLY|ND6_IFF_IPV6_ONLY_MANUAL)
#endif
+#define ND6_IFF_NO_PREFIXADDR 0x800
#ifdef _KERNEL
#define ND_IFINFO(ifp) \
diff --git a/sys/netinet6/nd6.c b/sys/netinet6/nd6.c
--- a/sys/netinet6/nd6.c
+++ b/sys/netinet6/nd6.c
@@ -318,8 +318,12 @@
/* If we globally accept rtadv, assume IPv6 on. */
nd->flags &= ~ND6_IFF_IFDISABLED;
}
- if (V_ip6_no_radr && !(ifp->if_flags & IFF_LOOPBACK))
- nd->flags |= ND6_IFF_NO_RADR;
+ if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
+ if (V_ip6_no_radr)
+ nd->flags |= ND6_IFF_NO_RADR;
+ if (V_ip6_no_prefixaddr)
+ nd->flags |= ND6_IFF_NO_PREFIXADDR;
+ }
/* XXX: we cannot call nd6_setmtu since ifp is not fully initialized */
nd6_setmtu0(ifp, nd);
diff --git a/sys/netinet6/nd6_rtr.c b/sys/netinet6/nd6_rtr.c
--- a/sys/netinet6/nd6_rtr.c
+++ b/sys/netinet6/nd6_rtr.c
@@ -1711,6 +1711,15 @@
}
if (ia6_match == NULL && new->ndpr_vltime) {
int ifidlen;
+ struct nd_ifinfo *ndi = ND_IFINFO(ifp);
+
+ /*
+ * If no_prefixaddr is set, skip creating a new address. Do
+ * this here after we've already processed any addresses that
+ * might already exist.
+ */
+ if (ndi->flags & ND6_IFF_NO_PREFIXADDR)
+ goto end;
/*
* 5.5.3 (d) (continued)

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