Driver core: notify userspace of network device renames

Provide rename event for when we rename network devices.

Signed-off-by: Jean Tourrilhes <jt@hpl.hp.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

 

1 files changed, 11 insertions, 0 deletions

diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 221a64ab64f7..e441ec7988c1 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -424,6 +424,17 @@ static int netdev_uevent(struct device *d, char **envp,
         if ((size <= 0) || (i >= num_envp))
                 return -ENOMEM;
 
+        /* pass ifindex to uevent.
+         * ifindex is useful as it won't change (interface name may change)
+         * and is what RtNetlink uses natively. */
+        envp[i++] = buf;
+        n = snprintf(buf, size, "IFINDEX=%d", dev->ifindex) + 1;
+        buf += n;
+        size -= n;
+
+        if ((size <= 0) || (i >= num_envp))
+                return -ENOMEM;
+
         envp[i] = NULL;
         return 0;
 }