Add netns and unshare support

option/netns.go

@@ -0,0 +1,57 @@
+package option
+
+import (
+	C "github.com/sagernet/sing-box/constant"
+	E "github.com/sagernet/sing/common/exceptions"
+	"github.com/sagernet/sing/common/json"
+	"github.com/sagernet/sing/common/json/badjson"
+)
+
+type _NetworkNamespace struct {
+	Type           string                         `json:"type,omitempty"`
+	Tag            string                         `json:"tag"`
+	DefaultOptions DefaultNetworkNamespaceOptions `json:"-"`
+	UnshareOptions UnshareNetworkNamespaceOptions `json:"-"`
+}
+
+type NetworkNamespace _NetworkNamespace
+
+func (o NetworkNamespace) MarshalJSON() ([]byte, error) {
+	var v any
+	switch o.Type {
+	case C.NetNsTypeDefault:
+		o.Type = ""
+		v = o.DefaultOptions
+	case C.NetNsTypeUnshare:
+		v = o.UnshareOptions
+	default:
+		return nil, E.New("unknown network namespace type: ", o.Type)
+	}
+	return badjson.MarshallObjects((_NetworkNamespace)(o), v)
+}
+
+func (o *NetworkNamespace) UnmarshalJSON(content []byte) error {
+	err := json.Unmarshal(content, (*_NetworkNamespace)(o))
+	if err != nil {
+		return err
+	}
+	var v any
+	switch o.Type {
+	case "", C.NetNsTypeDefault:
+		o.Type = C.NetNsTypeDefault
+		v = &o.DefaultOptions
+	case C.NetNsTypeUnshare:
+		v = &o.UnshareOptions
+	default:
+		return E.New("unknown network namespace type: ", o.Type)
+	}
+	return badjson.UnmarshallExcluded(content, (*_NetworkNamespace)(o), v)
+}
+
+type DefaultNetworkNamespaceOptions struct {
+	Path string `json:"path"`
+}
+
+type UnshareNetworkNamespaceOptions struct {
+	PidFile string `json:"pid_file,omitempty"`
+}

option/options.go

@@ -19,6 +19,7 @@ type _Options struct {
 	Certificate          *CertificateOptions   `json:"certificate,omitempty"`
 	CertificateProviders []CertificateProvider `json:"certificate_providers,omitempty"`
 	HTTPClients          []HTTPClient          `json:"http_clients,omitempty"`
+	NetworkNamespaces    []NetworkNamespace    `json:"network_namespaces,omitempty"`
 	Endpoints            []Endpoint            `json:"endpoints,omitempty"`
 	Inbounds             []Inbound             `json:"inbounds,omitempty"`
 	Outbounds            []Outbound            `json:"outbounds,omitempty"`

option/tun.go

@@ -12,6 +12,7 @@ import (
 
 type TunInboundOptions struct {
 	InterfaceName                 string                           `json:"interface_name,omitempty"`
+	NetNs                         string                           `json:"netns,omitempty"`
 	MTU                           uint32                           `json:"mtu,omitempty"`
 	Address                       badoption.Listable[netip.Prefix] `json:"address,omitempty"`
 	DNSMode                       string                           `json:"dns_mode,omitempty"`