l2tp: let pppol2tp_ioctl() fallback to dev_ioctl()

Guillaume Nault · davem330 · commit 4f5f85e9a70e · 2018-08-11T12:13:49.000-07:00
Return -ENOIOCTLCMD for unknown ioctl commands. This lets dev_ioctl()
handle generic socket ioctls like SIOCGIFNAME or SIOCGIFINDEX.
PF_PPPOX/PX_PROTO_OL2TP was one of the few socket types not honouring
this mechanism.

Signed-off-by: Guillaume Nault &lt;g.nault@alphalink.fr&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c
@@ -1137,7 +1137,7 @@ static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,
 		break;
 
 	default:
-		return -ENOSYS;
+		return -ENOIOCTLCMD;
 	}
 
 	return 0;

Original file line number	Diff line number	Diff line change
`@@ -1137,7 +1137,7 @@ static int pppol2tp_ioctl(struct socket *sock, unsigned int cmd,`
`1137`	`1137`	`break;`
`1138`	`1138`
`1139`	`1139`	`default:`
`1140`		`- return -ENOSYS;`
	`1140`	`+ return -ENOIOCTLCMD;`
`1141`	`1141`	`}`
`1142`	`1142`
`1143`	`1143`	`return 0;`