[PATCH v2 3/7] backports: backport {get,set}_user_ifreq

[Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>]

Backport them from 5.15, they are required by QRTR.

Signed-off-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
---
 backport/backport-include/linux/netdevice.h |  5 +++
 backport/compat/Makefile                    |  1 +
 backport/compat/backport-5.15.c             | 47 +++++++++++++++++++++
 3 files changed, 53 insertions(+)
 create mode 100644 backport/compat/backport-5.15.c

diff --git a/backport/backport-include/linux/netdevice.h b/backport/backport-include/linux/netdevice.h
index 22942398..4e553791 100644
--- a/backport/backport-include/linux/netdevice.h
+++ b/backport/backport-include/linux/netdevice.h
@@ -152,6 +152,11 @@ bp_dev_get_tstats64(struct net_device *dev, struct rtnl_link_stats64 *s);
 #endif /* < 4.11 */
 
 #if LINUX_VERSION_IS_LESS(5,15,0)
+#define get_user_ifreq LINUX_BACKPORT(get_user_ifreq)
+int get_user_ifreq(struct ifreq *ifr, void __user **ifrdata, void __user *arg);
+#define put_user_ifreq LINUX_BACKPORT(put_user_ifreq)
+int put_user_ifreq(struct ifreq *ifr, void __user *arg);
+
 static inline void backport_dev_put(struct net_device *dev)
 {
 	if (dev)
diff --git a/backport/compat/Makefile b/backport/compat/Makefile
index 2761e5f5..b9f1dee9 100644
--- a/backport/compat/Makefile
+++ b/backport/compat/Makefile
@@ -20,6 +20,7 @@ compat-$(CPTCFG_KERNEL_5_5) += backport-5.5.o
 compat-$(CPTCFG_KERNEL_5_10) += backport-5.10.o
 compat-$(CPTCFG_KERNEL_5_11) += backport-5.11.o
 compat-$(CPTCFG_KERNEL_5_13) += backport-5.13.o
+compat-$(CPTCFG_KERNEL_5_15) += backport-5.15.o
 
 compat-$(CPTCFG_BPAUTO_BUILD_SYSTEM_DATA_VERIFICATION) += verification/verify.o
 compat-$(CPTCFG_BPAUTO_BUILD_SYSTEM_DATA_VERIFICATION) += verification/pkcs7.asn1.o
diff --git a/backport/compat/backport-5.15.c b/backport/compat/backport-5.15.c
new file mode 100644
index 00000000..cc0a48fd
--- /dev/null
+++ b/backport/compat/backport-5.15.c
@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/compat.h>
+#include <linux/export.h>
+#include <linux/uaccess.h>
+#include <linux/netdevice.h>
+
+#include <uapi/linux/if.h>
+
+int get_user_ifreq(struct ifreq *ifr, void __user **ifrdata, void __user *arg)
+{
+	if (in_compat_syscall()) {
+		struct compat_ifreq *ifr32 = (struct compat_ifreq *)ifr;
+
+		memset(ifr, 0, sizeof(*ifr));
+		if (copy_from_user(ifr32, arg, sizeof(*ifr32)))
+			return -EFAULT;
+
+		if (ifrdata)
+			*ifrdata = compat_ptr(ifr32->ifr_data);
+
+		return 0;
+	}
+
+	if (copy_from_user(ifr, arg, sizeof(*ifr)))
+		return -EFAULT;
+
+	if (ifrdata)
+		*ifrdata = ifr->ifr_data;
+
+	return 0;
+}
+EXPORT_SYMBOL(get_user_ifreq);
+
+int put_user_ifreq(struct ifreq *ifr, void __user *arg)
+{
+	size_t size = sizeof(*ifr);
+
+	if (in_compat_syscall())
+		size = sizeof(struct compat_ifreq);
+
+	if (copy_to_user(arg, ifr, size))
+		return -EFAULT;
+
+	return 0;
+}
+EXPORT_SYMBOL(put_user_ifreq);
-- 
2.35.1

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