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moby--moby/libnetwork/drivers/bridge/setup_ipv6.go

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package bridge
import (
"fmt"
"io/ioutil"
"net"
"github.com/vishvananda/netlink"
)
var bridgeIPv6 *net.IPNet
const bridgeIPv6Str = "fe80::1/64"
func init() {
// We allow ourselves to panic in this special case because we indicate a
// failure to parse a compile-time define constant.
if ip, netw, err := net.ParseCIDR(bridgeIPv6Str); err == nil {
bridgeIPv6 = &net.IPNet{IP: ip, Mask: netw.Mask}
} else {
panic(fmt.Sprintf("Cannot parse default bridge IPv6 address %q: %v", bridgeIPv6Str, err))
}
}
func setupBridgeIPv6(config *NetworkConfiguration, i *bridgeInterface) error {
// Enable IPv6 on the bridge
procFile := "/proc/sys/net/ipv6/conf/" + config.BridgeName + "/disable_ipv6"
if err := ioutil.WriteFile(procFile, []byte{'0', '\n'}, 0644); err != nil {
return fmt.Errorf("Unable to enable IPv6 addresses on bridge: %v", err)
}
_, addrsv6, err := i.addresses()
if err != nil {
return err
}
// Add the default link local ipv6 address if it doesn't exist
if !findIPv6Address(netlink.Addr{IPNet: bridgeIPv6}, addrsv6) {
if err := netlink.AddrAdd(i.Link, &netlink.Addr{IPNet: bridgeIPv6}); err != nil {
return &IPv6AddrAddError{ip: bridgeIPv6, err: err}
}
}
// Store bridge network and default gateway
i.bridgeIPv6 = bridgeIPv6
i.gatewayIPv6 = i.bridgeIPv6.IP
return nil
}
func setupGatewayIPv6(config *NetworkConfiguration, i *bridgeInterface) error {
if config.FixedCIDRv6 == nil {
return ErrInvalidContainerSubnet
}
if !config.FixedCIDRv6.Contains(config.DefaultGatewayIPv6) {
return ErrInvalidGateway
}
if _, err := ipAllocator.RequestIP(config.FixedCIDRv6, config.DefaultGatewayIPv6); err != nil {
return err
}
// Store requested default gateway
i.gatewayIPv6 = config.DefaultGatewayIPv6
return nil
}