linux-kernel - [PATCH] net/tun: Call notifiers before and after changing device type

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Date:   Mon, 16 Nov 2020 08:44:31 +0100
From:   Martin Schiller <ms@....tdt.de>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Martin Schiller <ms@....tdt.de>
Subject: [PATCH] net/tun: Call notifiers before and after changing device type

Signed-off-by: Martin Schiller <ms@....tdt.de>
---
 drivers/net/tun.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index be69d272052f..8253c5b03105 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -3124,9 +3124,11 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
 				   "Linktype set failed because interface is up\n");
 			ret = -EBUSY;
 		} else {
+			call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, tun->dev);
 			tun->dev->type = (int) arg;
 			netif_info(tun, drv, tun->dev, "linktype set to %d\n",
 				   tun->dev->type);
+			call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, tun->dev);
 			ret = 0;
 		}
 		break;
-- 
2.20.1