diff options
Diffstat (limited to 'drivers/net/vxlan.c')
| -rw-r--r-- | drivers/net/vxlan.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c index ea203c1aaa2..aef44aa44fe 100644 --- a/drivers/net/vxlan.c +++ b/drivers/net/vxlan.c @@ -2014,6 +2014,29 @@ static void vxlan_set_multicast_list(struct net_device *dev) { } +static int vxlan_change_mtu(struct net_device *dev, int new_mtu) +{ + struct vxlan_dev *vxlan = netdev_priv(dev); + struct vxlan_rdst *dst = &vxlan->default_dst; + struct net_device *lowerdev; + int max_mtu; + + lowerdev = __dev_get_by_index(dev_net(dev), dst->remote_ifindex); + if (lowerdev == NULL) + return eth_change_mtu(dev, new_mtu); + + if (dst->remote_ip.sa.sa_family == AF_INET6) + max_mtu = lowerdev->mtu - VXLAN6_HEADROOM; + else + max_mtu = lowerdev->mtu - VXLAN_HEADROOM; + + if (new_mtu < 68 || new_mtu > max_mtu) + return -EINVAL; + + dev->mtu = new_mtu; + return 0; +} + static const struct net_device_ops vxlan_netdev_ops = { .ndo_init = vxlan_init, .ndo_uninit = vxlan_uninit, @@ -2022,7 +2045,7 @@ static const struct net_device_ops vxlan_netdev_ops = { .ndo_start_xmit = vxlan_xmit, .ndo_get_stats64 = ip_tunnel_get_stats64, .ndo_set_rx_mode = vxlan_set_multicast_list, - .ndo_change_mtu = eth_change_mtu, + .ndo_change_mtu = vxlan_change_mtu, .ndo_validate_addr = eth_validate_addr, .ndo_set_mac_address = eth_mac_addr, .ndo_fdb_add = vxlan_fdb_add, |