[X25]: ioctl conversion 32 bit user to 64 bit kernel

To allow 32 bit x25 module structures to be passed to a 64 bit kernel via
ioctl using the new compat_sock_ioctl registration mechanism instead of the
obsolete 'register_ioctl32_conversion into hash table' mechanism
Signed-off-by: Shaun Pereira <spereira@tusc.com.au>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/x25/af_x25.c

@@ -54,7 +54,10 @@
 #include <linux/termios.h>	/* For TIOCINQ/OUTQ */
 #include <linux/notifier.h>
 #include <linux/init.h>
+#include <linux/compat.h>
+
 #include <net/x25.h>
+#include <net/compat.h>
 
 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
@@ -69,6 +72,14 @@ static const struct proto_ops x25_proto_ops;
 
 static struct x25_address null_x25_address = {"               "};
 
+#ifdef CONFIG_COMPAT
+struct compat_x25_subscrip_struct {
+	char device[200-sizeof(compat_ulong_t)];
+	compat_ulong_t global_facil_mask;
+	compat_uint_t extended;
+};
+#endif
+
 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
 		  struct x25_address *calling_addr)
 {
@@ -1387,6 +1398,116 @@ static struct net_proto_family x25_family_ops = {
 	.owner	=	THIS_MODULE,
 };
 
+#ifdef CONFIG_COMPAT
+static int compat_x25_subscr_ioctl(unsigned int cmd,
+		struct compat_x25_subscrip_struct __user *x25_subscr32)
+{
+	struct compat_x25_subscrip_struct x25_subscr;
+	struct x25_neigh *nb;
+	struct net_device *dev;
+	int rc = -EINVAL;
+
+	rc = -EFAULT;
+	if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
+		goto out;
+
+	rc = -EINVAL;
+	dev = x25_dev_get(x25_subscr.device);
+	if (dev == NULL)
+		goto out;
+
+	nb = x25_get_neigh(dev);
+	if (nb == NULL)
+		goto out_dev_put;
+
+	dev_put(dev);
+
+	if (cmd == SIOCX25GSUBSCRIP) {
+		x25_subscr.extended = nb->extended;
+		x25_subscr.global_facil_mask = nb->global_facil_mask;
+		rc = copy_to_user(x25_subscr32, &x25_subscr,
+				sizeof(*x25_subscr32)) ? -EFAULT : 0;
+	} else {
+		rc = -EINVAL;
+		if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
+			rc = 0;
+			nb->extended = x25_subscr.extended;
+			nb->global_facil_mask = x25_subscr.global_facil_mask;
+		}
+	}
+	x25_neigh_put(nb);
+out:
+	return rc;
+out_dev_put:
+	dev_put(dev);
+	goto out;
+}
+
+static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
+				unsigned long arg)
+{
+	void __user *argp = compat_ptr(arg);
+	struct sock *sk = sock->sk;
+
+	int rc = -ENOIOCTLCMD;
+
+	switch(cmd) {
+	case TIOCOUTQ:
+	case TIOCINQ:
+		rc = x25_ioctl(sock, cmd, (unsigned long)argp);
+		break;
+	case SIOCGSTAMP:
+		rc = -EINVAL;
+		if (sk)
+			rc = compat_sock_get_timestamp(sk,
+					(struct timeval __user*)argp);
+		break;
+	case SIOCGIFADDR:
+	case SIOCSIFADDR:
+	case SIOCGIFDSTADDR:
+	case SIOCSIFDSTADDR:
+	case SIOCGIFBRDADDR:
+	case SIOCSIFBRDADDR:
+	case SIOCGIFNETMASK:
+	case SIOCSIFNETMASK:
+	case SIOCGIFMETRIC:
+	case SIOCSIFMETRIC:
+		rc = -EINVAL;
+		break;
+	case SIOCADDRT:
+	case SIOCDELRT:
+		rc = -EPERM;
+		if (!capable(CAP_NET_ADMIN))
+			break;
+		rc = x25_route_ioctl(cmd, argp);
+		break;
+	case SIOCX25GSUBSCRIP:
+		rc = compat_x25_subscr_ioctl(cmd, argp);
+		break;
+	case SIOCX25SSUBSCRIP:
+		rc = -EPERM;
+		if (!capable(CAP_NET_ADMIN))
+			break;
+		rc = compat_x25_subscr_ioctl(cmd, argp);
+		break;
+	case SIOCX25GFACILITIES:
+	case SIOCX25SFACILITIES:
+	case SIOCX25GCALLUSERDATA:
+	case SIOCX25SCALLUSERDATA:
+	case SIOCX25GCAUSEDIAG:
+	case SIOCX25SCUDMATCHLEN:
+	case SIOCX25CALLACCPTAPPRV:
+	case SIOCX25SENDCALLACCPT:
+		rc = x25_ioctl(sock, cmd, (unsigned long)argp);
+		break;
+	default:
+		rc = -ENOIOCTLCMD;
+		break;
+	}
+	return rc;
+}
+#endif
+
 static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
 	.family =	AF_X25,
 	.owner =	THIS_MODULE,
@@ -1398,6 +1519,9 @@ static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
 	.getname =	x25_getname,
 	.poll =		datagram_poll,
 	.ioctl =	x25_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl = compat_x25_ioctl,
+#endif
 	.listen =	x25_listen,
 	.shutdown =	sock_no_shutdown,
 	.setsockopt =	x25_setsockopt,