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feat(netlink): detect ipv6 support level (#2523)

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- add option `IPV6_CHECK_ADDRESSESES=[2001:4860:4860::8888]:53,[2606:4700:4700::1111]:53`
- gluetun needs access to the addresses above through the host firewall, to test ipv6 support before setting up the vpn
This commit is contained in:
Quentin McGaw
2026-04-07 13:48:15 +02:00
committed by GitHub
parent 1ae85aa5d0
commit 11883aa830
20 changed files with 498 additions and 67 deletions
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cmd/gluetun/main.go
+9 -4
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@@ -250,10 +250,13 @@ func _main(ctx context.Context, buildInfo models.BuildInformation,
return err
}
ipv6Supported, err := netLinker.IsIPv6Supported()
ipv6SupportLevel, err := netLinker.FindIPv6SupportLevel(ctx,
allSettings.IPv6.CheckAddresses, firewallConf)
if err != nil {
return fmt.Errorf("checking for IPv6 support: %w", err)
}
ipv6Supported := ipv6SupportLevel == netlink.IPv6Supported ||
ipv6SupportLevel == netlink.IPv6Internet
err = allSettings.Validate(storage, ipv6Supported, logger)
if err != nil {
@@ -453,7 +456,7 @@ func _main(ctx context.Context, buildInfo models.BuildInformation,
boringPoll := boringpoll.New(httpClient, boringPollLogger, allSettings.BoringPoll)
vpnLogger := logger.New(log.SetComponent("vpn"))
vpnLooper := vpn.NewLoop(allSettings.VPN, ipv6Supported, allSettings.Firewall.VPNInputPorts,
vpnLooper := vpn.NewLoop(allSettings.VPN, ipv6SupportLevel, allSettings.Firewall.VPNInputPorts,
providers, storage, boringPoll, allSettings.Health, healthChecker, healthcheckServer,
ovpnConf, netLinker, firewallConf, routingConf, portForwardLooper, cmder, publicIPLooper,
dnsLooper, vpnLogger, httpClient, buildInfo, *allSettings.Version.Enabled)
@@ -494,7 +497,7 @@ func _main(ctx context.Context, buildInfo models.BuildInformation,
httpServer, err := server.New(httpServerCtx, allSettings.ControlServer,
logger.New(log.SetComponent("http server")),
buildInfo, vpnLooper, portForwardLooper, dnsLooper, updaterLooper, publicIPLooper,
storage, ipv6Supported)
storage, ipv6SupportLevel.IsSupported())
if err != nil {
return fmt.Errorf("setting up control server: %w", err)
}
@@ -578,7 +581,9 @@ type netLinker interface {
Ruler
Linker
IsWireguardSupported() (ok bool, err error)
IsIPv6Supported() (ok bool, err error)
FindIPv6SupportLevel(ctx context.Context,
checkAddresses []netip.AddrPort, firewall netlink.Firewall,
) (level netlink.IPv6SupportLevel, err error)
FlushConntrack() error
PatchLoggerLevel(level log.Level)
}