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moby--moby/libnetwork/drivers/bridge/setup_verify.go
Alessandro Boch e22b54dee1 Check if present before programming IPv6 in bridge
Signed-off-by: Alessandro Boch <aboch@docker.com>
2016-01-07 09:37:57 -08:00

51 lines
1.5 KiB
Go

package bridge
import (
log "github.com/Sirupsen/logrus"
"github.com/docker/libnetwork/types"
"github.com/vishvananda/netlink"
)
func setupVerifyAndReconcile(config *networkConfiguration, i *bridgeInterface) error {
// Fetch a single IPv4 and a slice of IPv6 addresses from the bridge.
addrv4, addrsv6, err := i.addresses()
if err != nil {
return err
}
// Verify that the bridge does have an IPv4 address.
if addrv4.IPNet == nil {
return &ErrNoIPAddr{}
}
// Verify that the bridge IPv4 address matches the requested configuration.
if config.AddressIPv4 != nil && !addrv4.IP.Equal(config.AddressIPv4.IP) {
return &IPv4AddrNoMatchError{IP: addrv4.IP, CfgIP: config.AddressIPv4.IP}
}
// Verify that one of the bridge IPv6 addresses matches the requested
// configuration.
if config.EnableIPv6 && !findIPv6Address(netlink.Addr{IPNet: bridgeIPv6}, addrsv6) {
return (*IPv6AddrNoMatchError)(bridgeIPv6)
}
// Release any residual IPv6 address that might be there because of older daemon instances
for _, addrv6 := range addrsv6 {
if addrv6.IP.IsGlobalUnicast() && !types.CompareIPNet(addrv6.IPNet, i.bridgeIPv6) {
if err := netlink.AddrDel(i.Link, &addrv6); err != nil {
log.Warnf("Failed to remove residual IPv6 address %s from bridge: %v", addrv6.IPNet, err)
}
}
}
return nil
}
func findIPv6Address(addr netlink.Addr, addresses []netlink.Addr) bool {
for _, addrv6 := range addresses {
if addrv6.String() == addr.String() {
return true
}
}
return false
}