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[client] Clamp MSS on outbound traffic (#4735)

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This commit is contained in:
Viktor Liu
2025-11-04 17:18:51 +01:00
committed by GitHub
parent 679c58ce47
commit 45c25dca84
24 changed files with 804 additions and 134 deletions
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14
client/firewall/iptables/router_linux_test.go
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@@ -14,6 +14,7 @@ import (
firewall "github.com/netbirdio/netbird/client/firewall/manager"
"github.com/netbirdio/netbird/client/firewall/test"
"github.com/netbirdio/netbird/client/iface"
nbnet "github.com/netbirdio/netbird/client/net"
)
@@ -30,7 +31,7 @@ func TestIptablesManager_RestoreOrCreateContainers(t *testing.T) {
iptablesClient, err := iptables.NewWithProtocol(iptables.ProtocolIPv4)
require.NoError(t, err, "failed to init iptables client")
manager, err := newRouter(iptablesClient, ifaceMock)
manager, err := newRouter(iptablesClient, ifaceMock, iface.DefaultMTU)
require.NoError(t, err, "should return a valid iptables manager")
require.NoError(t, manager.init(nil))
@@ -38,7 +39,6 @@ func TestIptablesManager_RestoreOrCreateContainers(t *testing.T) {
assert.NoError(t, manager.Reset(), "shouldn't return error")
}()
// Now 5 rules:
// 1. established rule forward in
// 2. estbalished rule forward out
// 3. jump rule to POST nat chain
@@ -48,7 +48,9 @@ func TestIptablesManager_RestoreOrCreateContainers(t *testing.T) {
// 7. static return masquerade rule
// 8. mangle prerouting mark rule
// 9. mangle postrouting mark rule
require.Len(t, manager.rules, 9, "should have created rules map")
// 10. jump rule to MSS clamping chain
// 11. MSS clamping rule for outbound traffic
require.Len(t, manager.rules, 11, "should have created rules map")
exists, err := manager.iptablesClient.Exists(tableNat, chainPOSTROUTING, "-j", chainRTNAT)
require.NoError(t, err, "should be able to query the iptables %s table and %s chain", tableNat, chainPOSTROUTING)
@@ -82,7 +84,7 @@ func TestIptablesManager_AddNatRule(t *testing.T) {
iptablesClient, err := iptables.NewWithProtocol(iptables.ProtocolIPv4)
require.NoError(t, err, "failed to init iptables client")
manager, err := newRouter(iptablesClient, ifaceMock)
manager, err := newRouter(iptablesClient, ifaceMock, iface.DefaultMTU)
require.NoError(t, err, "shouldn't return error")
require.NoError(t, manager.init(nil))
@@ -155,7 +157,7 @@ func TestIptablesManager_RemoveNatRule(t *testing.T) {
t.Run(testCase.Name, func(t *testing.T) {
iptablesClient, _ := iptables.NewWithProtocol(iptables.ProtocolIPv4)
manager, err := newRouter(iptablesClient, ifaceMock)
manager, err := newRouter(iptablesClient, ifaceMock, iface.DefaultMTU)
require.NoError(t, err, "shouldn't return error")
require.NoError(t, manager.init(nil))
defer func() {
@@ -217,7 +219,7 @@ func TestRouter_AddRouteFiltering(t *testing.T) {
iptablesClient, err := iptables.NewWithProtocol(iptables.ProtocolIPv4)
require.NoError(t, err, "Failed to create iptables client")
r, err := newRouter(iptablesClient, ifaceMock)
r, err := newRouter(iptablesClient, ifaceMock, iface.DefaultMTU)
require.NoError(t, err, "Failed to create router manager")
require.NoError(t, r.init(nil))