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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/mss_test.go
+9 -8
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@@ -18,17 +18,16 @@ func Test_findHighestMSSDestination(t *testing.T) {
t.Parallel()
netlinker := netlink.New(&noopLogger{})
defaultIPv4MTU, err := findDefaultIPv4RouteMTU(netlinker)
require.NoError(t, err, "finding default IPv4 route MTU")
defaultMTU, err := findDefaultRouteMTU(netlinker)
require.NoError(t, err, "finding default route MTU")
ctx, cancel := context.WithCancel(t.Context())
const family = constants.AF_INET
fd, stop, err := startRawSocket(family, excludeMark)
families := []int{constants.AF_INET, constants.AF_INET6}
familyToFD, stop, err := startRawSockets(families, excludeMark)
require.NoError(t, err)
const ipv4 = true
tracker := newTracker(fd, ipv4)
tracker := newTracker(familyToFD)
trackerCh := make(chan error)
go func() {
trackerCh <- tracker.listen(ctx)
@@ -44,13 +43,15 @@ func Test_findHighestMSSDestination(t *testing.T) {
dsts := []netip.AddrPort{
netip.AddrPortFrom(netip.AddrFrom4([4]byte{1, 1, 1, 1}), 443),
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 timeout = time.Second
fw := getFirewall(t)
logger := &noopLogger{}
dst, mss, err := findHighestMSSDestination(t.Context(), fd, dsts,
excludeMark, defaultIPv4MTU, timeout, tracker, fw, logger)
dst, mss, err := findHighestMSSDestination(t.Context(), familyToFD, dsts,
excludeMark, defaultMTU, timeout, tracker, fw, logger)
require.NoError(t, err, "finding highest MSS destination")
assert.Contains(t, dsts, dst, "destination should be in the provided list")
assert.Greater(t, mss, uint32(1000), "MSS should be greater than 1000")