netdev - [PATCH net-next v2 12/31] eql: use ndo

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Date:   Tue, 20 Jul 2021 16:46:19 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     netdev@...r.kernel.org
Cc:     Christoph Hellwig <hch@....de>, Arnd Bergmann <arnd@...db.de>
Subject: [PATCH net-next v2 12/31] eql: use ndo_siocdevprivate

From: Arnd Bergmann <arnd@...db.de>

The private ioctls in eql pass the arguments correctly through ifr_data,
but the slaving_request_t and slave_config_t structures are incompatible
with compat mode and need special conversion code in the driver.

Convert to siocdevprivate for now, and return an error when called
in compat mode.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/net/eql.c | 24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)

diff --git a/drivers/net/eql.c b/drivers/net/eql.c
index 74263f8efe1a..8ef34901c2d8 100644
--- a/drivers/net/eql.c
+++ b/drivers/net/eql.c
@@ -113,6 +113,7 @@
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
+#include <linux/compat.h>
 #include <linux/capability.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
@@ -131,7 +132,8 @@
 
 static int eql_open(struct net_device *dev);
 static int eql_close(struct net_device *dev);
-static int eql_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
+static int eql_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
+			      void __user *data, int cmd);
 static netdev_tx_t eql_slave_xmit(struct sk_buff *skb, struct net_device *dev);
 
 #define eql_is_slave(dev)	((dev->flags & IFF_SLAVE) == IFF_SLAVE)
@@ -170,7 +172,7 @@ static const char version[] __initconst =
 static const struct net_device_ops eql_netdev_ops = {
 	.ndo_open	= eql_open,
 	.ndo_stop	= eql_close,
-	.ndo_do_ioctl	= eql_ioctl,
+	.ndo_siocdevprivate = eql_siocdevprivate,
 	.ndo_start_xmit	= eql_slave_xmit,
 };
 
@@ -268,25 +270,29 @@ static int eql_s_slave_cfg(struct net_device *dev, slave_config_t __user *sc);
 static int eql_g_master_cfg(struct net_device *dev, master_config_t __user *mc);
 static int eql_s_master_cfg(struct net_device *dev, master_config_t __user *mc);
 
-static int eql_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+static int eql_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
+			      void __user *data, int cmd)
 {
 	if (cmd != EQL_GETMASTRCFG && cmd != EQL_GETSLAVECFG &&
 	    !capable(CAP_NET_ADMIN))
 	  	return -EPERM;
 
+	if (in_compat_syscall()) /* to be implemented */
+		return -EOPNOTSUPP;
+
 	switch (cmd) {
 		case EQL_ENSLAVE:
-			return eql_enslave(dev, ifr->ifr_data);
+			return eql_enslave(dev, data);
 		case EQL_EMANCIPATE:
-			return eql_emancipate(dev, ifr->ifr_data);
+			return eql_emancipate(dev, data);
 		case EQL_GETSLAVECFG:
-			return eql_g_slave_cfg(dev, ifr->ifr_data);
+			return eql_g_slave_cfg(dev, data);
 		case EQL_SETSLAVECFG:
-			return eql_s_slave_cfg(dev, ifr->ifr_data);
+			return eql_s_slave_cfg(dev, data);
 		case EQL_GETMASTRCFG:
-			return eql_g_master_cfg(dev, ifr->ifr_data);
+			return eql_g_master_cfg(dev, data);
 		case EQL_SETMASTRCFG:
-			return eql_s_master_cfg(dev, ifr->ifr_data);
+			return eql_s_master_cfg(dev, data);
 		default:
 			return -EOPNOTSUPP;
 	}
-- 
2.29.2