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[TUNTAP]: Allow setting the linktype of the tap device from userspace

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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>
This commit is contained in:
Mike Kershaw 2005-09-01 17:40:05 -07:00 committed by David S. Miller
parent 80ac2912f8
commit ff4cc3ac93
2 changed files with 16 additions and 0 deletions
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15
drivers/net/tun.c
View file

@ -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;

1
include/linux/if_tun.h
View file

@ -77,6 +77,7 @@ struct tun_struct {
#define TUNSETIFF _IOW('T', 202, int)
#define TUNSETPERSIST _IOW('T', 203, int)
#define TUNSETOWNER _IOW('T', 204, int)
#define TUNSETLINK _IOW('T', 205, int)
/* TUNSETIFF ifr flags */
#define IFF_TUN 0x0001