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authorMike Kershaw <dragorn@kismetwireless.net>2005-09-01 17:40:05 -0700
committerDavid S. Miller <davem@davemloft.net>2005-09-01 17:40:05 -0700
commitff4cc3ac93e1d0369928fd60ec1fe82417afc576 (patch)
treec8f9380cfaedfd9f63f8e2eb0fff2d660aa81bab /drivers/net/tun.c
parent80ac2912f846c01d702774bb6aa7100ec71e88b9 (diff)
downloadlinux-ff4cc3ac93e1d0369928fd60ec1fe82417afc576.tar.bz2
[TUNTAP]: Allow setting the linktype of the tap device from userspace
Currently tun/tap only supports the EN10MB ARP type. For use with wireless and other networking types it should be possible to set the ARP type via an ioctl. Patch v2: Included check that the tap interface is down before changing the link type out from underneath it Signed-off-by: Mike Kershaw <dragorn@kismetwireless.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/tun.c')
-rw-r--r--drivers/net/tun.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index effab0b9adca..50b8c6754b1e 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -18,6 +18,9 @@
/*
* Changes:
*
+ * Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14
+ * Add TUNSETLINK ioctl to set the link encapsulation
+ *
* Mark Smith <markzzzsmith@yahoo.com.au>
* Use random_ether_addr() for tap MAC address.
*
@@ -612,6 +615,18 @@ static int tun_chr_ioctl(struct inode *inode, struct file *file,
DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner);
break;
+ case TUNSETLINK:
+ /* Only allow setting the type when the interface is down */
+ if (tun->dev->flags & IFF_UP) {
+ DBG(KERN_INFO "%s: Linktype set failed because interface is up\n",
+ tun->dev->name);
+ return -EBUSY;
+ } else {
+ tun->dev->type = (int) arg;
+ DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type);
+ }
+ break;
+
#ifdef TUN_DEBUG
case TUNSETDEBUG:
tun->debug = arg;