use slash as path separator for some sysctl commands

Convert `.` path separators to `/` when enabling forwarding
for bridgeName, interfaceName and mgmtPortName to avoid errors
when those names contain `.` characters e.g. `foo.200`

Fixes: #5283

Signed-off-by: Artyom Babiy <[email protected]>

Author: hedgieinsocks

go-controller/pkg/node/gateway_init.go

@@ -27,8 +27,10 @@ import (
 func bridgedGatewayNodeSetup(nodeName, bridgeName, physicalNetworkName string) (string, error) {
 	// IPv6 forwarding is enabled globally
 	if config.IPv4Mode {
-		stdout, stderr, err := util.RunSysctl("-w", fmt.Sprintf("net.ipv4.conf.%s.forwarding=1", bridgeName))
-		if err != nil || stdout != fmt.Sprintf("net.ipv4.conf.%s.forwarding = 1", bridgeName) {
+		// we use forward slash as path separator to allow dotted bridgeName e.g. foo.200
+		stdout, stderr, err := util.RunSysctl("-w", fmt.Sprintf("net/ipv4/conf/%s/forwarding=1", bridgeName))
+		// systctl output enforces dot as path separator
+		if err != nil || stdout != fmt.Sprintf("net.ipv4.conf.%s.forwarding = 1", strings.ReplaceAll(bridgeName, ".", "/")) {
 			return "", fmt.Errorf("could not set the correct forwarding value for interface %s: stdout: %v, stderr: %v, err: %v",
 				bridgeName, stdout, stderr, err)
 		}

go-controller/pkg/node/gateway_init_linux_test.go

@@ -166,7 +166,7 @@ func shareGatewayInterfaceTest(app *cli.App, testNS ns.NetNS,
 		})
 		if config.IPv4Mode {
 			fexec.AddFakeCmd(&ovntest.ExpectedCmd{
-				Cmd:    "sysctl -w net.ipv4.conf.breth0.forwarding=1",
+				Cmd:    "sysctl -w net/ipv4/conf/breth0/forwarding=1",
 				Output: "net.ipv4.conf.breth0.forwarding = 1",
 			})
 		}
@@ -595,7 +595,7 @@ func shareGatewayInterfaceDPUTest(app *cli.App, testNS ns.NetNS,
 		})
 		if config.IPv4Mode {
 			fexec.AddFakeCmd(&ovntest.ExpectedCmd{
-				Cmd:    "sysctl -w net.ipv4.conf.brp0.forwarding=1",
+				Cmd:    "sysctl -w net/ipv4/conf/brp0/forwarding=1",
 				Output: "net.ipv4.conf.brp0.forwarding = 1",
 			})
 		}
@@ -1057,7 +1057,7 @@ OFPT_GET_CONFIG_REPLY (xid=0x4): frags=normal miss_send_len=0`
 		})
 		if config.IPv4Mode {
 			fexec.AddFakeCmd(&ovntest.ExpectedCmd{
-				Cmd:    "sysctl -w net.ipv4.conf.breth0.forwarding=1",
+				Cmd:    "sysctl -w net/ipv4/conf/breth0/forwarding=1",
 				Output: "net.ipv4.conf.breth0.forwarding = 1",
 			})
 		}

go-controller/pkg/node/gateway_udn.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"net"
 	"slices"
+	"strings"
 	"sync/atomic"
 	"time"
 
@@ -522,8 +523,10 @@ func (udng *UserDefinedNetworkGateway) addUDNManagementPort() (netlink.Link, err
 	// STEP3
 	// IPv6 forwarding is enabled globally
 	if ipv4, _ := udng.IPMode(); ipv4 {
-		stdout, stderr, err := util.RunSysctl("-w", fmt.Sprintf("net.ipv4.conf.%s.forwarding=1", interfaceName))
-		if err != nil || stdout != fmt.Sprintf("net.ipv4.conf.%s.forwarding = 1", interfaceName) {
+		// we use forward slash as path separator to allow dotted interfaceName e.g. foo.200
+		stdout, stderr, err := util.RunSysctl("-w", fmt.Sprintf("net/ipv4/conf/%s/forwarding=1", interfaceName))
+		// systctl output enforces dot as path separator
+		if err != nil || stdout != fmt.Sprintf("net.ipv4.conf.%s.forwarding = 1", strings.ReplaceAll(interfaceName, ".", "/")) {
 			return nil, fmt.Errorf("could not set the correct forwarding value for interface %s: stdout: %v, stderr: %v, err: %v",
 				interfaceName, stdout, stderr, err)
 		}
@@ -891,8 +894,10 @@ func addRPFilterLooseModeForManagementPort(mgmtPortName string) error {
 	rpFilterLooseMode := "2"
 	// TODO: Convert testing framework to mock golang module utilities. Example:
 	// result, err := sysctl.Sysctl(fmt.Sprintf("net/ipv4/conf/%s/rp_filter", types.K8sMgmtIntfName), rpFilterLooseMode)
-	stdout, stderr, err := util.RunSysctl("-w", fmt.Sprintf("net.ipv4.conf.%s.rp_filter=%s", mgmtPortName, rpFilterLooseMode))
-	if err != nil || stdout != fmt.Sprintf("net.ipv4.conf.%s.rp_filter = %s", mgmtPortName, rpFilterLooseMode) {
+	// we use forward slash as path separator to allow dotted mgmtPortName e.g. foo.200
+	stdout, stderr, err := util.RunSysctl("-w", fmt.Sprintf("net/ipv4/conf/%s/rp_filter=%s", mgmtPortName, rpFilterLooseMode))
+	// systctl output enforces dot as path separator
+	if err != nil || stdout != fmt.Sprintf("net.ipv4.conf.%s.rp_filter = %s", strings.ReplaceAll(mgmtPortName, ".", "/"), rpFilterLooseMode) {
 		return fmt.Errorf("could not set the correct rp_filter value for interface %s: stdout: %v, stderr: %v, err: %v",
 			mgmtPortName, stdout, stderr, err)
 	}

go-controller/pkg/node/gateway_udn_test.go

@@ -59,14 +59,14 @@ func getCreationFakeCommands(fexec *ovntest.FakeExec, mgtPort, mgtPortMAC, netNa
 	})
 
 	fexec.AddFakeCmd(&ovntest.ExpectedCmd{
-		Cmd:    "sysctl -w net.ipv4.conf." + mgtPort + ".forwarding=1",
+		Cmd:    "sysctl -w net/ipv4/conf/" + mgtPort + "/forwarding=1",
 		Output: "net.ipv4.conf." + mgtPort + ".forwarding = 1",
 	})
 }
 
 func getRPFilterLooseModeFakeCommands(fexec *ovntest.FakeExec) {
 	fexec.AddFakeCmd(&ovntest.ExpectedCmd{
-		Cmd:    "sysctl -w net.ipv4.conf.ovn-k8s-mp3.rp_filter=2",
+		Cmd:    "sysctl -w net/ipv4/conf/ovn-k8s-mp3/rp_filter=2",
 		Output: "net.ipv4.conf.ovn-k8s-mp3.rp_filter = 2",
 	})
 }
@@ -148,7 +148,7 @@ func setUpGatewayFakeOVSCommands(fexec *ovntest.FakeExec) {
 	})
 	if config.IPv4Mode {
 		fexec.AddFakeCmd(&ovntest.ExpectedCmd{
-			Cmd:    "sysctl -w net.ipv4.conf.breth0.forwarding=1",
+			Cmd:    "sysctl -w net/ipv4/conf/breth0/forwarding=1",
 			Output: "net.ipv4.conf.breth0.forwarding = 1",
 		})
 	}