supported an ndp command suboption to disable IPv6 in the given interface

Obtained from: KAME
Reviewd by: ume, gnn
MFC after: 2 week

2 files changed, 18 insertions, 0 deletions

diff --git a/usr.sbin/ndp/ndp.8 b/usr.sbin/ndp/ndp.8
index ea33646..4d99527 100644
--- a/usr.sbin/ndp/ndp.8
+++ b/usr.sbin/ndp/ndp.8
@@ -198,6 +198,19 @@ selection, see the
 .Pa IMPLEMENTATION
 file supplied with the KAME kit.
 .It Xo
+.Ic disabled
+.Xc
+Disable IPv6 operation on the interface.
+When disabled, the interface discards any IPv6 packets
+received on or being sent to the interface.
+In the sending case, an error of ENETDOWN will be returned to the
+application.
+This flag is typically set automatically in the kernel as a result of
+a certain failure of Duplicate Address Detection.
+While the flag can be set or cleared by hand with the
+.Nm
+command, it is not generally advisable to modify this flag manually.
+.It Xo
 .Ic basereachable=(number)
 .Xc
 Specify the BaseReachbleTimer on the interface in millisecond.
diff --git a/usr.sbin/ndp/ndp.c b/usr.sbin/ndp/ndp.c
index 96e8c14..33e1a6a 100644
--- a/usr.sbin/ndp/ndp.c
+++ b/usr.sbin/ndp/ndp.c
@@ -989,6 +989,7 @@ ifinfo(ifname, argc, argv)
 		} \
 	} while (0)
 
+		SETFLAG("disabled", ND6_IFF_IFDISABLED);
 		SETFLAG("nud", ND6_IFF_PERFORMNUD);
 #ifdef ND6_IFF_ACCEPT_RTADV
 		SETFLAG("accept_rtadv", ND6_IFF_ACCEPT_RTADV);
@@ -1055,6 +1056,10 @@ ifinfo(ifname, argc, argv)
 #endif
 	if (ND.flags) {
 		printf("\nFlags: ");
+#ifdef ND6_IFF_IFDISABLED
+		if ((ND.flags & ND6_IFF_IFDISABLED))
+			printf("disabled ");
+#endif
 		if ((ND.flags & ND6_IFF_PERFORMNUD))
 			printf("nud ");
 #ifdef ND6_IFF_ACCEPT_RTADV