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119 lines
3.6 KiB
Go
119 lines
3.6 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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"os"
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"github.com/docker/libnetwork/types"
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"github.com/sirupsen/logrus"
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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 (
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bridgeIPv6Str = "fe80::1/64"
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ipv6ForwardConfPerm = 0644
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ipv6ForwardConfDefault = "/proc/sys/net/ipv6/conf/default/forwarding"
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ipv6ForwardConfAll = "/proc/sys/net/ipv6/conf/all/forwarding"
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)
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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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var err error
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if bridgeIPv6, err = types.ParseCIDR(bridgeIPv6Str); err != nil {
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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 *networkConfiguration, i *bridgeInterface) error {
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procFile := "/proc/sys/net/ipv6/conf/" + config.BridgeName + "/disable_ipv6"
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ipv6BridgeData, err := ioutil.ReadFile(procFile)
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if err != nil {
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return fmt.Errorf("Cannot read IPv6 setup for bridge %v: %v", config.BridgeName, err)
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}
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// Enable IPv6 on the bridge only if it isn't already enabled
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if ipv6BridgeData[0] != '0' {
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if err := ioutil.WriteFile(procFile, []byte{'0', '\n'}, ipv6ForwardConfPerm); 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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}
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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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if err := i.programIPv6Address(); err != nil {
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return err
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}
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if config.AddressIPv6 == nil {
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return nil
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}
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// Store the user specified bridge network and network gateway and program it
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i.bridgeIPv6 = config.AddressIPv6
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i.gatewayIPv6 = config.AddressIPv6.IP
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if err := i.programIPv6Address(); err != nil {
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return err
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}
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// Setting route to global IPv6 subnet
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logrus.Debugf("Adding route to IPv6 network %s via device %s", config.AddressIPv6.String(), config.BridgeName)
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err = i.nlh.RouteAdd(&netlink.Route{
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Scope: netlink.SCOPE_UNIVERSE,
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LinkIndex: i.Link.Attrs().Index,
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Dst: config.AddressIPv6,
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})
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if err != nil && !os.IsExist(err) {
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logrus.Errorf("Could not add route to IPv6 network %s via device %s: %s", config.AddressIPv6.String(), config.BridgeName, err)
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}
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return nil
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}
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func setupGatewayIPv6(config *networkConfiguration, i *bridgeInterface) error {
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if config.AddressIPv6 == nil {
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return &ErrInvalidContainerSubnet{}
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}
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if !config.AddressIPv6.Contains(config.DefaultGatewayIPv6) {
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return &ErrInvalidGateway{}
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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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func setupIPv6Forwarding(config *networkConfiguration, i *bridgeInterface) error {
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// Get current IPv6 default forwarding setup
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ipv6ForwardDataDefault, err := ioutil.ReadFile(ipv6ForwardConfDefault)
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if err != nil {
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return fmt.Errorf("Cannot read IPv6 default forwarding setup: %v", err)
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}
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// Enable IPv6 default forwarding only if it is not already enabled
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if ipv6ForwardDataDefault[0] != '1' {
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if err := ioutil.WriteFile(ipv6ForwardConfDefault, []byte{'1', '\n'}, ipv6ForwardConfPerm); err != nil {
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logrus.Warnf("Unable to enable IPv6 default forwarding: %v", err)
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}
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}
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// Get current IPv6 all forwarding setup
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ipv6ForwardDataAll, err := ioutil.ReadFile(ipv6ForwardConfAll)
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if err != nil {
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return fmt.Errorf("Cannot read IPv6 all forwarding setup: %v", err)
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}
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// Enable IPv6 all forwarding only if it is not already enabled
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if ipv6ForwardDataAll[0] != '1' {
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if err := ioutil.WriteFile(ipv6ForwardConfAll, []byte{'1', '\n'}, ipv6ForwardConfPerm); err != nil {
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logrus.Warnf("Unable to enable IPv6 all forwarding: %v", err)
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}
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}
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return nil
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}
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