diff options
author | Ed Swierk <eswierk@arastra.com> | 2007-09-16 15:21:38 -0400 |
---|---|---|
committer | David S. Miller <davem@sunset.davemloft.net> | 2007-10-10 19:51:19 -0400 |
commit | 4885a50476b95fa0f4caad179a80783508c2fe86 (patch) | |
tree | 55a5b007e593e8ee810e142517854a42b23af6fe /drivers | |
parent | 0b69d4bd263c75b3e2ec94f1c72f338b84be817e (diff) |
[TAP]: Configurable interface MTU.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-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 d279151f065d..d8b8e68ef70b 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c | |||
@@ -172,6 +172,18 @@ tun_net_mclist(struct net_device *dev) | |||
172 | } | 172 | } |
173 | } | 173 | } |
174 | 174 | ||
175 | #define MIN_MTU 68 | ||
176 | #define MAX_MTU 65535 | ||
177 | |||
178 | static int | ||
179 | tun_net_change_mtu(struct net_device *dev, int new_mtu) | ||
180 | { | ||
181 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) | ||
182 | return -EINVAL; | ||
183 | dev->mtu = new_mtu; | ||
184 | return 0; | ||
185 | } | ||
186 | |||
175 | /* Initialize net device. */ | 187 | /* Initialize net device. */ |
176 | static void tun_net_init(struct net_device *dev) | 188 | static void tun_net_init(struct net_device *dev) |
177 | { | 189 | { |
@@ -183,6 +195,7 @@ static void tun_net_init(struct net_device *dev) | |||
183 | dev->hard_header_len = 0; | 195 | dev->hard_header_len = 0; |
184 | dev->addr_len = 0; | 196 | dev->addr_len = 0; |
185 | dev->mtu = 1500; | 197 | dev->mtu = 1500; |
198 | dev->change_mtu = tun_net_change_mtu; | ||
186 | 199 | ||
187 | /* Zero header length */ | 200 | /* Zero header length */ |
188 | dev->type = ARPHRD_NONE; | 201 | dev->type = ARPHRD_NONE; |
@@ -195,6 +208,7 @@ static void tun_net_init(struct net_device *dev) | |||
195 | dev->set_multicast_list = tun_net_mclist; | 208 | dev->set_multicast_list = tun_net_mclist; |
196 | 209 | ||
197 | ether_setup(dev); | 210 | ether_setup(dev); |
211 | dev->change_mtu = tun_net_change_mtu; | ||
198 | 212 | ||
199 | /* random address already created for us by tun_set_iff, use it */ | 213 | /* random address already created for us by tun_set_iff, use it */ |
200 | memcpy(dev->dev_addr, tun->dev_addr, min(sizeof(tun->dev_addr), sizeof(dev->dev_addr)) ); | 214 | memcpy(dev->dev_addr, tun->dev_addr, min(sizeof(tun->dev_addr), sizeof(dev->dev_addr)) ); |