Fix WAN Steering not discovering VLAN-tagged and GRE interfaces (#566)

ParseIpRules regex only matched eth\d+ and ppp\d+, silently dropping
VLAN-tagged WANs (eth6.228) and GRE tunnels (gre1) from LTE/5G modems.
Broadened to match any Linux interface name with optional VLAN suffix.

Author: tvancott42

src/NetworkOptimizer.Web/Services/WanSteerDeploymentService.cs

@@ -499,7 +499,7 @@ internal static string SanitizeWanKey(string name)
     internal static Dictionary<string, (string FWMark, string RouteTable)> ParseIpRules(string output)
     {
         var map = new Dictionary<string, (string FWMark, string RouteTable)>();
-        var regex = new Regex(@"fwmark\s+(0x[0-9a-f]+)/0x7e0000\s+lookup\s+(\d+\.(eth\d+|ppp\d+))");
+        var regex = new Regex(@"fwmark\s+(0x[0-9a-f]+)/0x7e0000\s+lookup\s+(\d+\.([a-z][a-z0-9]*(?:\.\d+)?))");
 
         foreach (var line in output.Split('\n'))
         {

tests/NetworkOptimizer.Web.Tests/WanSteerDeploymentServiceTests.cs

@@ -69,6 +69,51 @@ public void Returns_empty_for_empty_output()
             WanSteerDeploymentService.ParseIpRules("").Should().BeEmpty();
         }
 
+        [Fact]
+        public void Parses_vlan_tagged_interface()
+        {
+            var output = "32508:	from all fwmark 0x1a0000/0x7e0000 lookup 201.eth6.228\n";
+
+            var result = WanSteerDeploymentService.ParseIpRules(output);
+
+            result.Should().ContainKey("eth6.228");
+            result["eth6.228"].FWMark.Should().Be("0x1a0000");
+            result["eth6.228"].RouteTable.Should().Be("201.eth6.228");
+        }
+
+        [Fact]
+        public void Parses_gre_interface()
+        {
+            var output = "32510:	from all fwmark 0x6e0000/0x7e0000 lookup 180.gre1\n";
+
+            var result = WanSteerDeploymentService.ParseIpRules(output);
+
+            result.Should().ContainKey("gre1");
+            result["gre1"].FWMark.Should().Be("0x6e0000");
+            result["gre1"].RouteTable.Should().Be("180.gre1");
+        }
+
+        [Fact]
+        public void Parses_real_gateway_output_with_mixed_interfaces()
+        {
+            var output = string.Join("\n",
+                "0:	from all lookup local",
+                "32504:	from all fwmark 0x1c0000/0x7e0000 lookup 202.eth0",
+                "32506:	from all fwmark 0x720000/0x7e0000 lookup 182.eth1",
+                "32508:	from all fwmark 0x1a0000/0x7e0000 lookup 201.eth6.228",
+                "32510:	from all fwmark 0x6e0000/0x7e0000 lookup 180.gre1",
+                "32766:	from all lookup main",
+                "32767:	from all lookup default");
+
+            var result = WanSteerDeploymentService.ParseIpRules(output);
+
+            result.Should().HaveCount(4);
+            result.Should().ContainKey("eth0");
+            result.Should().ContainKey("eth1");
+            result.Should().ContainKey("eth6.228");
+            result.Should().ContainKey("gre1");
+        }
+
         [Fact]
         public void Ignores_non_matching_fwmark_masks()
         {