[NET]: Fix ipx/econet/appletalk/irda ioctl crashes

Fix kernel oopses whenever somebody issues compatible ioctl on AppleTalk,
Econet, IPX or IRDA socket.  For AppleTalk/Econet/IRDA it restores state
in which these sockets were before compat_ioctl was introduced to the socket
ops, for IPX it implements support for 4 ioctls which were not implemented
before - as these ioctls use structures which match between 32bit and 64bit
userspace, no special code is needed, just call 64bit ioctl handler.

Signed-off-by: Petr Vandrovec <petr@vandrovec.name>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/appletalk/ddp.c

@@ -1819,6 +1819,22 @@ static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 	return rc;
 }
 
+
+#ifdef CONFIG_COMPAT
+static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+	/*
+	 * All Appletalk ioctls except SIOCATALKDIFADDR are standard.  And
+	 * SIOCATALKDIFADDR is handled by upper layer as well, so there is
+	 * nothing to do.  Eventually SIOCATALKDIFADDR should be moved
+	 * here so there is no generic SIOCPROTOPRIVATE translation in the
+	 * system.
+	 */
+	return -ENOIOCTLCMD;
+}
+#endif
+
+
 static struct net_proto_family atalk_family_ops = {
 	.family		= PF_APPLETALK,
 	.create		= atalk_create,
@@ -1836,6 +1852,9 @@ static const struct proto_ops SOCKOPS_WRAPPED(atalk_dgram_ops) = {
 	.getname	= atalk_getname,
 	.poll		= datagram_poll,
 	.ioctl		= atalk_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl	= atalk_compat_ioctl,
+#endif
 	.listen		= sock_no_listen,
 	.shutdown	= sock_no_shutdown,
 	.setsockopt	= sock_no_setsockopt,

net/econet/af_econet.c

@@ -693,6 +693,19 @@ static int econet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg
 	return 0;
 }
 
+#ifdef CONFIG_COMPAT
+static int econet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+	/*
+	 * All ioctls provided by econet are standard.  There is one gotcha, sockaddr_ec
+	 * differs between 32bit and 64bit.  Fortunately nobody in kernel uses portion
+	 * of sockaddr which differs between 32bit and 64bit, so we do not need special
+	 * handling.
+	 */
+	return -ENOIOCTLCMD;
+}
+#endif
+
 static struct net_proto_family econet_family_ops = {
 	.family =	PF_ECONET,
 	.create =	econet_create,
@@ -710,6 +723,9 @@ static const struct proto_ops SOCKOPS_WRAPPED(econet_ops) = {
 	.getname =	econet_getname, 
 	.poll =		datagram_poll,
 	.ioctl =	econet_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl =	econet_compat_ioctl,
+#endif
 	.listen =	sock_no_listen,
 	.shutdown =	sock_no_shutdown,
 	.setsockopt =	sock_no_setsockopt,

net/ipx/af_ipx.c

@@ -1892,6 +1892,29 @@ static int ipx_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 	return rc;
 }
 
+
+#ifdef CONFIG_COMPAT
+static int ipx_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+	/*
+	 * These 4 commands use same structure on 32bit and 64bit.  Rest of IPX
+	 * commands is handled by generic ioctl code.  As these commands are
+	 * SIOCPROTOPRIVATE..SIOCPROTOPRIVATE+3, they cannot be handled by generic
+	 * code.
+	 */
+	switch (cmd) {
+	case SIOCAIPXITFCRT:
+	case SIOCAIPXPRISLT:
+	case SIOCIPXCFGDATA:
+	case SIOCIPXNCPCONN:
+		return ipx_ioctl(sock, cmd, arg);
+	default:
+		return -ENOIOCTLCMD;
+	}
+}
+#endif
+
+
 /*
  * Socket family declarations
  */
@@ -1913,6 +1936,9 @@ static const struct proto_ops SOCKOPS_WRAPPED(ipx_dgram_ops) = {
 	.getname	= ipx_getname,
 	.poll		= datagram_poll,
 	.ioctl		= ipx_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl	= ipx_compat_ioctl,
+#endif
 	.listen		= sock_no_listen,
 	.shutdown	= sock_no_shutdown, /* FIXME: support shutdown */
 	.setsockopt	= ipx_setsockopt,

net/irda/af_irda.c

@@ -1830,6 +1830,19 @@ static int irda_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 	return 0;
 }
 
+#ifdef CONFIG_COMPAT
+/*
+ * Function irda_ioctl (sock, cmd, arg)
+ */
+static int irda_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+	/*
+	 * All IRDA's ioctl are standard ones.
+	 */
+	return -ENOIOCTLCMD;
+}
+#endif
+
 /*
  * Function irda_setsockopt (sock, level, optname, optval, optlen)
  *
@@ -2476,6 +2489,9 @@ static const struct proto_ops SOCKOPS_WRAPPED(irda_stream_ops) = {
 	.getname =	irda_getname,
 	.poll =		irda_poll,
 	.ioctl =	irda_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl =	irda_compat_ioctl,
+#endif
 	.listen =	irda_listen,
 	.shutdown =	irda_shutdown,
 	.setsockopt =	irda_setsockopt,
@@ -2497,6 +2513,9 @@ static const struct proto_ops SOCKOPS_WRAPPED(irda_seqpacket_ops) = {
 	.getname =	irda_getname,
 	.poll =		datagram_poll,
 	.ioctl =	irda_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl =	irda_compat_ioctl,
+#endif
 	.listen =	irda_listen,
 	.shutdown =	irda_shutdown,
 	.setsockopt =	irda_setsockopt,
@@ -2518,6 +2537,9 @@ static const struct proto_ops SOCKOPS_WRAPPED(irda_dgram_ops) = {
 	.getname =	irda_getname,
 	.poll =		datagram_poll,
 	.ioctl =	irda_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl =	irda_compat_ioctl,
+#endif
 	.listen =	irda_listen,
 	.shutdown =	irda_shutdown,
 	.setsockopt =	irda_setsockopt,
@@ -2540,6 +2562,9 @@ static const struct proto_ops SOCKOPS_WRAPPED(irda_ultra_ops) = {
 	.getname =	irda_getname,
 	.poll =		datagram_poll,
 	.ioctl =	irda_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl =	irda_compat_ioctl,
+#endif
 	.listen =	sock_no_listen,
 	.shutdown =	irda_shutdown,
 	.setsockopt =	irda_setsockopt,