feat: add parsing of vlanNNNN:ethX style VLAN cmdline args

Check for invalid VLAN ID numbers during cmdline parsing

Fixes #9552

Signed-off-by: Joakim Nohlgård <[email protected]>
Signed-off-by: Dmitriy Matrenichev <[email protected]>
(cherry picked from commit 78353f7)

Author: jnohlgard

internal/app/machined/pkg/controllers/network/cmdline.go

@@ -337,11 +337,18 @@ func ParseCmdlineNetwork(cmdline *procfs.Cmdline) (CmdlineNetworking, error) {
 
 		_, vlanNumberString, ok := strings.Cut(vlanName, ".")
 		if !ok {
-			return settings, fmt.Errorf("malformed vlan commandline argument: %s", *vlanSettings)
+			vlanNumberString, ok = strings.CutPrefix(vlanName, "vlan")
+			if !ok {
+				return settings, fmt.Errorf("malformed vlan commandline argument: %s", *vlanSettings)
+			}
 		}
 
 		vlanID, err := strconv.Atoi(vlanNumberString)
 
+		if vlanID < 1 || 4095 < vlanID {
+			return settings, fmt.Errorf("invalid vlanID=%d, must be in the range 1..4095: %s", vlanID, *vlanSettings)
+		}
+
 		if err != nil || vlanNumberString == "" {
 			return settings, errors.New("unable to parse vlan")
 		}

internal/app/machined/pkg/controllers/network/cmdline_test.go

@@ -5,6 +5,7 @@
 package network_test
 
 import (
+	"fmt"
 	"net"
 	"net/netip"
 	"sort"
@@ -432,6 +433,58 @@ func (suite *CmdlineSuite) TestParse() {
 				},
 			},
 		},
+		{
+			name:    "vlan configuration with alternative link name vlan0008",
+			cmdline: "vlan=vlan0008:eth1",
+			expectedSettings: network.CmdlineNetworking{
+				NetworkLinkSpecs: []netconfig.LinkSpecSpec{
+					{
+						Name:        "eth1.8",
+						Logical:     true,
+						Up:          true,
+						Kind:        netconfig.LinkKindVLAN,
+						Type:        nethelpers.LinkEther,
+						ParentName:  "eth1",
+						ConfigLayer: netconfig.ConfigCmdline,
+						VLAN: netconfig.VLANSpec{
+							VID:      8,
+							Protocol: nethelpers.VLANProtocol8021Q,
+						},
+					},
+				},
+			},
+		},
+		{
+			name:    "vlan configuration with alternative link name vlan1",
+			cmdline: "vlan=vlan4095:eth1",
+			expectedSettings: network.CmdlineNetworking{
+				NetworkLinkSpecs: []netconfig.LinkSpecSpec{
+					{
+						Name:        "eth1.4095",
+						Logical:     true,
+						Up:          true,
+						Kind:        netconfig.LinkKindVLAN,
+						Type:        nethelpers.LinkEther,
+						ParentName:  "eth1",
+						ConfigLayer: netconfig.ConfigCmdline,
+						VLAN: netconfig.VLANSpec{
+							VID:      4095,
+							Protocol: nethelpers.VLANProtocol8021Q,
+						},
+					},
+				},
+			},
+		},
+		{
+			name:          "vlan configuration with invalid vlan ID 4096",
+			cmdline:       "vlan=eth1.4096:eth1",
+			expectedError: fmt.Sprintf("invalid vlanID=%d, must be in the range 1..4095: %s", 4096, "eth1.4096:eth1"),
+		},
+		{
+			name:          "vlan configuration with invalid vlan ID 0",
+			cmdline:       "vlan=eth1.0:eth1",
+			expectedError: fmt.Sprintf("invalid vlanID=%d, must be in the range 1..4095: %s", 0, "eth1.0:eth1"),
+		},
 		{
 			name:    "multiple ip configurations",
 			cmdline: "ip=172.20.0.2::172.20.0.1:255.255.255.0::eth1::::: ip=eth3:dhcp ip=:::::eth4:dhcp::::",