diff options
| author | Ed Swierk <eswierk@arastra.com> | 2007-09-16 12:21:38 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-10-10 16:51:19 -0700 |
| commit | 4885a50476b95fa0f4caad179a80783508c2fe86 (patch) | |
| tree | 55a5b007e593e8ee810e142517854a42b23af6fe | |
| parent | 0b69d4bd263c75b3e2ec94f1c72f338b84be817e (diff) | |
[TAP]: Configurable interface MTU.
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/tun.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c index d279151f065..d8b8e68ef70 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -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. */ 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->addr_len = 0; dev->mtu = 1500; + dev->change_mtu = tun_net_change_mtu; /* Zero header length */ dev->type = ARPHRD_NONE; @@ -195,6 +208,7 @@ static void tun_net_init(struct net_device *dev) dev->set_multicast_list = tun_net_mclist; ether_setup(dev); + dev->change_mtu = tun_net_change_mtu; /* 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)) ); |