ITQC/containernetworking-plugins
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vlan: add MTU validation in loadNetConf

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Signed-off-by: Bruce Ma <brucema19901024@gmail.com>
This commit is contained in:
Bruce Ma 2019-10-25 19:59:33 +08:00
parent a16232968d
commit bee8d6cf30
1 changed files with 18 additions and 4 deletions
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22
plugins/main/vlan/vlan.go
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@ -58,9 +58,27 @@ func loadConf(bytes []byte) (*NetConf, string, error) {
if n.VlanId < 0 || n.VlanId > 4094 {
return nil, "", fmt.Errorf("invalid VLAN ID %d (must be between 0 and 4095 inclusive)", n.VlanId)
}
// check existing and MTU of master interface
masterMTU, err := getMTUByName(n.Master)
if err != nil {
return nil, "", err
}
if n.MTU < 0 || n.MTU > masterMTU {
return nil, "", fmt.Errorf("invalid MTU %d, must be [0, master MTU(%d)]", n.MTU, masterMTU)
}
return n, n.CNIVersion, nil
}
func getMTUByName(ifName string) (int, error) {
link, err := netlink.LinkByName(ifName)
if err != nil {
return 0, err
}
return link.Attrs().MTU, nil
}
func createVlan(conf *NetConf, ifName string, netns ns.NetNS) (*current.Interface, error) {
vlan := &current.Interface{}
@ -76,10 +94,6 @@ func createVlan(conf *NetConf, ifName string, netns ns.NetNS) (*current.Interfac
return nil, err
}
if conf.MTU <= 0 {
conf.MTU = m.Attrs().MTU
}
v := &netlink.Vlan{
LinkAttrs: netlink.LinkAttrs{
MTU: conf.MTU,