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35693a1a47
- Basically this is porting docker PR #9381 to libnetwork - Added a Config.Validate() method where to consolidate a priori validation of bridge configuration - Have bridgeInterface store the current v4/v6 default gateways - Introduced two setupStep functions to set the requested def gateways Signed-off-by: Alessandro Boch <aboch@docker.com>
58 lines
1.5 KiB
Go
58 lines
1.5 KiB
Go
package bridge
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import (
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"fmt"
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"io/ioutil"
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"net"
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"github.com/vishvananda/netlink"
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)
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var bridgeIPv6 *net.IPNet
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const bridgeIPv6Str = "fe80::1/64"
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func init() {
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// We allow ourselves to panic in this special case because we indicate a
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// failure to parse a compile-time define constant.
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if ip, netw, err := net.ParseCIDR(bridgeIPv6Str); err == nil {
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bridgeIPv6 = &net.IPNet{IP: ip, Mask: netw.Mask}
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} else {
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panic(fmt.Sprintf("Cannot parse default bridge IPv6 address %q: %v", bridgeIPv6Str, err))
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}
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}
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func setupBridgeIPv6(config *Configuration, i *bridgeInterface) error {
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// Enable IPv6 on the bridge
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procFile := "/proc/sys/net/ipv6/conf/" + config.BridgeName + "/disable_ipv6"
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if err := ioutil.WriteFile(procFile, []byte{'0', '\n'}, 0644); err != nil {
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return fmt.Errorf("Unable to enable IPv6 addresses on bridge: %v", err)
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}
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if err := netlink.AddrAdd(i.Link, &netlink.Addr{IPNet: bridgeIPv6}); err != nil {
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return &IPv6AddrAddError{ip: bridgeIPv6, err: err}
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}
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// Store bridge network and default gateway
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i.bridgeIPv6 = bridgeIPv6
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i.gatewayIPv6 = i.bridgeIPv6.IP
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return nil
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}
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func setupGatewayIPv6(config *Configuration, i *bridgeInterface) error {
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if config.FixedCIDRv6 == nil {
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return ErrInvalidContainerSubnet
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}
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if !config.FixedCIDRv6.Contains(config.DefaultGatewayIPv6) {
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return ErrInvalidGateway
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}
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if _, err := ipAllocator.RequestIP(config.FixedCIDRv6, config.DefaultGatewayIPv6); err != nil {
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return err
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}
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// Store requested default gateway
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i.gatewayIPv6 = config.DefaultGatewayIPv6
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return nil
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}
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