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package bridge
import (
"context"
"fmt"
"net"
"net/netip"
"os"
"github.com/containerd/log"
"github.com/vishvananda/netlink"
)
// bridgeIPv6 is the default, link-local IPv6 address for the bridge (fe80::1/64)
var bridgeIPv6 = &net.IPNet{IP: net.ParseIP("fe80::1"), Mask: net.CIDRMask(64, 128)}
// Standard link local prefix
var linkLocalPrefix = netip.MustParsePrefix("fe80::/64")
const (
ipv6ForwardConfPerm = 0o644
ipv6ForwardConfDefault = "/proc/sys/net/ipv6/conf/default/forwarding"
ipv6ForwardConfAll = "/proc/sys/net/ipv6/conf/all/forwarding"
)
func setupBridgeIPv6(config *networkConfiguration, i *bridgeInterface) error {
procFile := "/proc/sys/net/ipv6/conf/" + config.BridgeName + "/disable_ipv6"
ipv6BridgeData, err := os.ReadFile(procFile)
if err != nil {
return fmt.Errorf("Cannot read IPv6 setup for bridge %v: %v", config.BridgeName, err)
}
// Enable IPv6 on the bridge only if it isn't already enabled
if ipv6BridgeData[0] != '0' {
if err := os.WriteFile(procFile, []byte{'0', '\n'}, ipv6ForwardConfPerm); err != nil {
return fmt.Errorf("Unable to enable IPv6 addresses on bridge: %v", err)
}
}
// Remove unwanted addresses from the bridge, add required addresses, and assign
// values to "i.bridgeIPv6", "i.gatewayIPv6".
if err := i.programIPv6Addresses(config); err != nil {
return err
}
// Setting route to global IPv6 subnet
log.G(context.TODO()).Debugf("Adding route to IPv6 network %s via device %s", config.AddressIPv6.String(), config.BridgeName)
err = i.nlh.RouteAdd(&netlink.Route{
Scope: netlink.SCOPE_UNIVERSE,
LinkIndex: i.Link.Attrs().Index,
Dst: config.AddressIPv6,
})
if err != nil && !os.IsExist(err) {
log.G(context.TODO()).Errorf("Could not add route to IPv6 network %s via device %s: %s", config.AddressIPv6.String(), config.BridgeName, err)
}
return nil
}
func setupGatewayIPv6(config *networkConfiguration, i *bridgeInterface) error {
if !config.AddressIPv6.Contains(config.DefaultGatewayIPv6) {
return &ErrInvalidGateway{}
}
// Store requested default gateway
i.gatewayIPv6 = config.DefaultGatewayIPv6
return nil
}
func setupIPv6Forwarding(config *networkConfiguration, i *bridgeInterface) error {
// Get current IPv6 default forwarding setup
ipv6ForwardDataDefault, err := os.ReadFile(ipv6ForwardConfDefault)
if err != nil {
return fmt.Errorf("Cannot read IPv6 default forwarding setup: %v", err)
}
// Enable IPv6 default forwarding only if it is not already enabled
if ipv6ForwardDataDefault[0] != '1' {
if err := os.WriteFile(ipv6ForwardConfDefault, []byte{'1', '\n'}, ipv6ForwardConfPerm); err != nil {
log.G(context.TODO()).Warnf("Unable to enable IPv6 default forwarding: %v", err)
}
}
// Get current IPv6 all forwarding setup
ipv6ForwardDataAll, err := os.ReadFile(ipv6ForwardConfAll)
if err != nil {
return fmt.Errorf("Cannot read IPv6 all forwarding setup: %v", err)
}
// Enable IPv6 all forwarding only if it is not already enabled
if ipv6ForwardDataAll[0] != '1' {
if err := os.WriteFile(ipv6ForwardConfAll, []byte{'1', '\n'}, ipv6ForwardConfPerm); err != nil {
log.G(context.TODO()).Warnf("Unable to enable IPv6 all forwarding: %v", err)
}
}
return nil
}
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