diff options
| author | Mike Kershaw <dragorn@kismetwireless.net> | 2005-09-01 17:40:05 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2005-09-01 17:40:05 -0700 |
| commit | ff4cc3ac93e1d0369928fd60ec1fe82417afc576 (patch) | |
| tree | c8f9380cfaedfd9f63f8e2eb0fff2d660aa81bab | |
| parent | 80ac2912f846c01d702774bb6aa7100ec71e88b9 (diff) | |
[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>
| -rw-r--r-- | drivers/net/tun.c | 15 | ||||
| -rw-r--r-- | include/linux/if_tun.h | 1 |
2 files changed, 16 insertions, 0 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c index effab0b9adc..50b8c6754b1 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; diff --git a/include/linux/if_tun.h b/include/linux/if_tun.h index 096a85a58ae..88aef7b86ef 100644 --- a/include/linux/if_tun.h +++ b/include/linux/if_tun.h @@ -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 |