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[TAP]: Configurable interface MTU. 

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ed Swierk 2007-09-16 12:21:38 -07:00 committed by David S. Miller
parent 0b69d4bd26
commit 4885a50476
1 changed files with 14 additions and 0 deletions
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14
drivers/net/tun.c
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@ -172,6 +172,18 @@ tun_net_mclist(struct net_device *dev)
} }
} }
#define MIN_MTU 68
#define MAX_MTU 65535
static int
tun_net_change_mtu(struct net_device *dev, int new_mtu)
{
if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU)
return -EINVAL;
dev->mtu = new_mtu;
return 0;
}
/* Initialize net device. */ /* Initialize net device. */
static void tun_net_init(struct net_device *dev) static void tun_net_init(struct net_device *dev)
{ {
@ -183,6 +195,7 @@ static void tun_net_init(struct net_device *dev)
dev->hard_header_len = 0; dev->hard_header_len = 0;
dev->addr_len = 0; dev->addr_len = 0;
dev->mtu = 1500; dev->mtu = 1500;
dev->change_mtu = tun_net_change_mtu;
/* Zero header length */ /* Zero header length */
dev->type = ARPHRD_NONE; dev->type = ARPHRD_NONE;
@ -195,6 +208,7 @@ static void tun_net_init(struct net_device *dev)
dev->set_multicast_list = tun_net_mclist; dev->set_multicast_list = tun_net_mclist;
ether_setup(dev); ether_setup(dev);
dev->change_mtu = tun_net_change_mtu;
/* random address already created for us by tun_set_iff, use it */ /* random address already created for us by tun_set_iff, use it */
memcpy(dev->dev_addr, tun->dev_addr, min(sizeof(tun->dev_addr), sizeof(dev->dev_addr)) ); memcpy(dev->dev_addr, tun->dev_addr, min(sizeof(tun->dev_addr), sizeof(dev->dev_addr)) );