fix: network device in netns

cmd/config/decode.go

@@ -22,6 +22,7 @@ type RawConfig struct {
     Radvd   radvd.Config `yaml:"radvd" json:"radvd"`
     Proxy   proxy.Config `yaml:"proxy" json:"proxy"`
     Network struct {
+        Dev     string    `yaml:"dev" json:"dev"`
         DNS     []string  `yaml:"dns" json:"dns"`
         ByPass  []string  `yaml:"bypass" json:"bypass"`
         Exclude []string  `yaml:"exclude" json:"exclude"`
@@ -46,6 +47,18 @@ func configDecode(raw []byte, fileSuffix string) RawConfig {
     return config
 }
 
+func decodeDev(rawConfig *RawConfig, config *Config) {
+    config.Dev = rawConfig.Network.Dev
+    if config.Dev == "" {
+        setV4 := rawConfig.Network.IPv4.Address != "" || rawConfig.Network.IPv4.Gateway != ""
+        setV6 := rawConfig.Network.IPv6.Address != "" || rawConfig.Network.IPv6.Gateway != ""
+        if setV4 || setV6 {
+            log.Panicf("Missing dev option in network settings")
+        }
+    }
+    log.Debugf("Network device -> %s", config.Dev)
+}
+
 func decodeDns(rawConfig *RawConfig, config *Config) {
     for _, address := range rawConfig.Network.DNS { // dns options
         if common.IsIPv4(address, false) || common.IsIPv6(address, false) {
@@ -135,7 +148,11 @@ func decodeProxy(rawConfig *RawConfig, config *Config) {
 
 func decodeRadvd(rawConfig *RawConfig, config *Config) {
     config.Radvd = rawConfig.Radvd
+    if config.Radvd.Enable && config.Radvd.Dev == "" {
+        log.Panicf("Radvd enabled without dev option")
+    }
     log.Debugf("Radvd log level -> %d", config.Radvd.Log)
+    log.Debugf("Radvd network dev -> %s", config.Radvd.Dev)
     log.Debugf("Radvd enable -> %t", config.Radvd.Enable)
     log.Debugf("Radvd options -> %v", config.Radvd.Option)
     log.Debugf("Radvd prefix -> %v", config.Radvd.Prefix)

cmd/config/main.go

@@ -12,6 +12,7 @@ import (
 )
 
 type Config struct {
+    Dev    string
     DNS    []string
     IPv4   network.Config
     IPv6   network.Config
@@ -31,6 +32,7 @@ func Load(configFile string, config *Config) {
         log.Panicf("Failed to open %s -> %v", configFile, err)
     }
     rawConfig := configDecode(raw, path.Ext(configFile)) // decode configure content
+    decodeDev(&rawConfig, config)
     decodeDns(&rawConfig, config)
     decodeBypass(&rawConfig, config)
     decodeExclude(&rawConfig, config)

cmd/controller.go

@@ -43,7 +43,7 @@ func loadNetwork(settings *config.Config) {
     settings.IPv4.TProxyPort = v4TProxyPort
     settings.IPv6.RouteTable = v6RouteTable
     settings.IPv6.TProxyPort = v6TProxyPort
-    network.Load(settings.DNS, &settings.IPv4, &settings.IPv6)
+    network.Load(settings.DNS, &settings.IPv4, &settings.IPv6, settings.Dev)
 }
 
 func loadProxy(settings *config.Config) {

cmd/network/main.go

@@ -17,13 +17,30 @@ type Config struct {
 
 var run = common.RunCommand
 
-func Load(dns []string, ipv4 *Config, ipv6 *Config) {
+func Load(dns []string, ipv4 *Config, ipv6 *Config, dev string) {
     loadDns(dns) // init dns server
-    flushNetwork() // clear network settings
+    delay := false
-    loadV4Network(ipv4)
+    setV4 := ipv4.Address != "" || ipv4.Gateway != ""
-    loadV6Network(ipv6)
+    setV6 := ipv6.Address != "" || ipv6.Gateway != ""
+    if setV4 && setV6 { // clear network settings
+        delay = true
+        flushNetwork(dev)
+        loadV4Network(ipv4, dev)
+        loadV6Network(ipv6, dev)
+    } else if setV6 {
+        delay = true
+        flushV6Network(dev)
+        loadV6Network(ipv6, dev)
+    } else if setV4 {
+        flushV4Network(dev)
+        loadV4Network(ipv4, dev)
+    } else {
+        log.Infof("Skip system IP configure")
+    }
+    if delay {
         log.Info("Wait 1s for IPv6 setting up")
         time.Sleep(time.Second) // wait for ipv6 setting up (ND protocol) -> RA should reply less than 0.5s
+    }
     loadV4TProxy(ipv4, getV4Cidr())
     loadV6TProxy(ipv6, getV6Cidr())
 }

cmd/network/network.go

@@ -23,34 +23,48 @@ func getV6Cidr() []string {
     return v6Cidr
 }
 
-func flushNetwork() {
+func flushNetwork(dev string) {
     log.Info("Flush system IP configure")
-    run("ip", "link", "set", "eth0", "down")
+    run("ip", "link", "set", dev, "down")
-    run("ip", "-4", "addr", "flush", "dev", "eth0")
+    run("ip", "-4", "addr", "flush", "dev", dev)
-    run("ip", "-6", "addr", "flush", "dev", "eth0")
+    run("ip", "-6", "addr", "flush", "dev", dev)
-    run("ip", "link", "set", "eth0", "up")
+    run("ip", "link", "set", dev, "up")
 }
 
-func loadV4Network(v4 *Config) {
+func flushV4Network(dev string) {
+    log.Info("Flush system IPv4 configure")
+    run("ip", "link", "set", dev, "down")
+    run("ip", "-4", "addr", "flush", "dev", dev)
+    run("ip", "link", "set", dev, "up")
+}
+
+func flushV6Network(dev string) {
+    log.Info("Flush system IPv6 configure")
+    run("ip", "link", "set", dev, "down")
+    run("ip", "-6", "addr", "flush", "dev", dev)
+    run("ip", "link", "set", dev, "up")
+}
+
+func loadV4Network(v4 *Config, dev string) {
     log.Info("Enabled IPv4 forward")
     run("sysctl", "-w", "net.ipv4.ip_forward=1")
     log.Info("Setting up system IPv4 configure")
     if v4.Address != "" {
-        run("ip", "-4", "addr", "add", v4.Address, "dev", "eth0")
+        run("ip", "-4", "addr", "add", v4.Address, "dev", dev)
     }
     if v4.Gateway != "" {
-        run("ip", "-4", "route", "add", "default", "via", v4.Gateway, "dev", "eth0")
+        run("ip", "-4", "route", "add", "default", "via", v4.Gateway, "dev", dev)
     }
 }
 
-func loadV6Network(v6 *Config) {
+func loadV6Network(v6 *Config, dev string) {
     log.Info("Enabled IPv6 forward")
     run("sysctl", "-w", "net.ipv6.conf.all.forwarding=1")
     log.Info("Setting up system IPv6 configure")
     if v6.Address != "" {
-        run("ip", "-6", "addr", "add", v6.Address, "dev", "eth0")
+        run("ip", "-6", "addr", "add", v6.Address, "dev", dev)
     }
     if v6.Gateway != "" {
-        run("ip", "-6", "route", "add", "default", "via", v6.Gateway, "dev", "eth0")
+        run("ip", "-6", "route", "add", "default", "via", v6.Gateway, "dev", dev)
     }
 }

cmd/radvd/radvd.go

@@ -8,6 +8,7 @@ import (
 
 type Config struct {
     Log    int               `yaml:"log" json:"log"`
+    Dev    string            `yaml:"dev" json:"dev"`
     Enable bool              `yaml:"enable" json:"enable"`
     Client []string          `yaml:"client" json:"client"`
     Option map[string]string `yaml:"option" json:"option"`
@@ -85,7 +86,7 @@ func loadDnssl(suffix []string, option map[string]string) string { // load radvd
 }
 
 func Load(Radvd *Config) {
-    config := "interface eth0 {\n"
+    config := "interface " + Radvd.Dev + " {\n"
     config += loadOption(Radvd.Option, 4)
     config += loadPrefix(Radvd.Prefix.Cidr, Radvd.Prefix.Option)
     config += loadRoute(Radvd.Route.Cidr, Radvd.Route.Option)