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feat(pmtud/tcp): support mixed IPv4 and IPv6 TCP servers

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- Add default cloudflare and google tls ipv6 servers to default tcp servers
- update integration test to try against both ipv4 and ipv6 servers
This commit is contained in:
Quentin McGaw
2026-02-19 17:11:16 +00:00
parent 1c43a045d1
commit c6b211ef9b
15 changed files with 175 additions and 70 deletions
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internal/pmtud/tcp/helpers_test.go
+16 -10
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@@ -78,24 +78,30 @@ func findLoopbackMTU(netlinker *netlink.NetLink) (mtu uint32, err error) {
return 0, fmt.Errorf("%w: no loopback route found", errRouteNotFound)
}
func findDefaultIPv4RouteMTU(netlinker *netlink.NetLink) (mtu uint32, err error) {
func findDefaultRouteMTU(netlinker *netlink.NetLink) (mtu uint32, err error) {
noopLogger := &noopLogger{}
routing := routing.New(netlinker, noopLogger)
defaultRoutes, err := routing.DefaultRoutes()
if err != nil {
return 0, fmt.Errorf("getting default routes: %w", err)
}
for _, route := range defaultRoutes {
if route.Family != netlink.FamilyV4 {
continue
families := []uint8{constants.AF_INET, constants.AF_INET6}
for _, family := range families {
for _, route := range defaultRoutes {
if route.Family != family {
continue
}
link, err := netlinker.LinkByName(route.NetInterface)
if err != nil {
return 0, fmt.Errorf("getting link by name: %w", err)
}
mtu = max(mtu, link.MTU)
}
link, err := netlinker.LinkByName(defaultRoutes[0].NetInterface)
if err != nil {
return 0, fmt.Errorf("getting link by name: %w", err)
}
return link.MTU, nil
}
return 0, fmt.Errorf("%w: no default route found", errRouteNotFound)
if mtu == 0 {
return 0, fmt.Errorf("%w: no default route found", errRouteNotFound)
}
return mtu, nil
}
func reserveClosedPort(t *testing.T) (port uint16) {