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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/tcp_integration_test.go
+16 -4
View File
@@ -18,10 +18,21 @@ import (
func Test_PathMTUDiscover(t *testing.T) {
t.Parallel()
noopLogger := log.New(log.SetLevel(log.LevelDebug))
const tryTimeout = time.Second
deadline, ok := t.Deadline()
if ok {
timeLeft := time.Until(deadline)
const maxTimeNeeded = tryTimeout * 4 // MSS discovery + 3 MTU tries
require.GreaterOrEqual(t, timeLeft, maxTimeNeeded,
"not enough time remaining for TCP PMTUD test, need %s and got %s",
maxTimeNeeded, timeLeft)
}
logger := log.New(log.SetLevel(log.LevelDebug))
cmder := command.New()
fw, err := firewall.NewConfig(t.Context(), noopLogger, cmder, nil, nil)
fw, err := firewall.NewConfig(t.Context(), logger, cmder, nil, nil)
if errors.Is(err, firewall.ErrIPTablesNotSupported) {
t.Skip("iptables not installed, skipping TCP PMTUD tests")
}
@@ -32,11 +43,12 @@ func Test_PathMTUDiscover(t *testing.T) {
netip.AddrPortFrom(netip.AddrFrom4([4]byte{1, 1, 1, 1}), 443),
netip.AddrPortFrom(netip.AddrFrom4([4]byte{8, 8, 8, 8}), 53),
netip.AddrPortFrom(netip.AddrFrom4([4]byte{8, 8, 8, 8}), 443),
netip.AddrPortFrom(netip.MustParseAddr("2606:4700:4700::1111"), 443),
netip.AddrPortFrom(netip.MustParseAddr("2001:4860:4860::8888"), 443),
}
const minMTU = constants.MinIPv6MTU
const maxMTU = constants.MaxEthernetFrameSize
const tryTimeout = time.Second
mtu, err := PathMTUDiscover(t.Context(), dsts, minMTU, maxMTU, tryTimeout, fw, noopLogger)
mtu, err := PathMTUDiscover(t.Context(), dsts, minMTU, maxMTU, tryTimeout, fw, logger)
require.NoError(t, err, "discovering path MTU")
assert.Greater(t, mtu, uint32(0), "MTU should be greater than 0")
t.Logf("discovered path MTU is %d", mtu)