[Devel] [PATCH RH7 02/32] Revert "ms/tun: Add ioctl() TUNGETDEVNETNS cmd to allow obtaining real net ns of tun device"

[Pavel Tikhomirov]

This reverts commit b823f8df2fcbc936ef228d5eeb419d06df4cc4f7.

We switch from procfs ns-files to nsfs ones, so we will apply nsfs
version of the patch instead.

https://jira.sw.ru/browse/PSBM-102357

Signed-off-by: Pavel Tikhomirov <ptikhomirov at virtuozzo.com>
---
 drivers/net/tun.c           | 10 ----------
 include/uapi/linux/if_tun.h |  1 -
 2 files changed, 11 deletions(-)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index cd91433641c3..c2bebdeab0bc 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -2330,7 +2330,6 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
 	void __user* argp = (void __user*)arg;
 	unsigned int ifindex, carrier;
 	struct ifreq ifr;
-	struct net *net;
 	kuid_t owner;
 	kgid_t group;
 	int sndbuf;
@@ -2407,7 +2406,6 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
 
 	tun_debug(KERN_INFO, tun, "tun_chr_ioctl cmd %u\n", cmd);
 
-	net = dev_net(tun->dev);
 	ret = 0;
 	switch (cmd) {
 	case TUNGETIFF:
@@ -2625,14 +2623,6 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
 		ret = tun_net_change_carrier(tun->dev, (bool)carrier);
 		break;
 
-	case TUNGETDEVNETNS:
-		ret = -EPERM;
-		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
-			goto unlock;
-
-		ret = open_net_ns_fd(net);
-		break;
-
 	default:
 		ret = -EINVAL;
 		break;
diff --git a/include/uapi/linux/if_tun.h b/include/uapi/linux/if_tun.h
index b24812331a17..af37bafdc36c 100644
--- a/include/uapi/linux/if_tun.h
+++ b/include/uapi/linux/if_tun.h
@@ -57,7 +57,6 @@
 #define TUNSETVNETBE _IOW('T', 222, int)
 #define TUNGETVNETBE _IOR('T', 223, int)
 #define TUNSETCARRIER _IOW('T', 226, int)
-#define TUNGETDEVNETNS _IO('T', 227)
 
 /* CONFIG_VE_TUNTAP_ACCOUNTING should be set */
 #define TUNSETACCTID _IOW('T', 300, struct ifreq)
-- 
2.24.1