Add interface address rule items

route/rule/rule_interface_address.go

@@ -0,0 +1,62 @@
+package rule
+
+import (
+	"net/netip"
+	"strings"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing/common"
+	"github.com/sagernet/sing/common/control"
+	"github.com/sagernet/sing/common/json/badjson"
+	"github.com/sagernet/sing/common/json/badoption"
+)
+
+var _ RuleItem = (*InterfaceAddressItem)(nil)
+
+type InterfaceAddressItem struct {
+	networkManager     adapter.NetworkManager
+	interfaceAddresses map[string][]netip.Prefix
+	description        string
+}
+
+func NewInterfaceAddressItem(networkManager adapter.NetworkManager, interfaceAddresses *badjson.TypedMap[string, badoption.Listable[badoption.Prefixable]]) *InterfaceAddressItem {
+	item := &InterfaceAddressItem{
+		networkManager:     networkManager,
+		interfaceAddresses: make(map[string][]netip.Prefix, interfaceAddresses.Size()),
+	}
+	var entryDescriptions []string
+	for _, entry := range interfaceAddresses.Entries() {
+		prefixes := make([]netip.Prefix, 0, len(entry.Value))
+		for _, prefixable := range entry.Value {
+			prefixes = append(prefixes, prefixable.Build(netip.Prefix{}))
+		}
+		item.interfaceAddresses[entry.Key] = prefixes
+		entryDescriptions = append(entryDescriptions, entry.Key+"="+strings.Join(common.Map(prefixes, netip.Prefix.String), ","))
+	}
+	item.description = "interface_address=[" + strings.Join(entryDescriptions, " ") + "]"
+	return item
+}
+
+func (r *InterfaceAddressItem) Match(metadata *adapter.InboundContext) bool {
+	interfaces := r.networkManager.InterfaceFinder().Interfaces()
+	for ifName, addresses := range r.interfaceAddresses {
+		iface := common.Find(interfaces, func(it control.Interface) bool {
+			return it.Name == ifName
+		})
+		if iface.Name == "" {
+			return false
+		}
+		if common.All(addresses, func(address netip.Prefix) bool {
+			return common.All(iface.Addresses, func(it netip.Prefix) bool {
+				return !address.Overlaps(it)
+			})
+		}) {
+			return false
+		}
+	}
+	return true
+}
+
+func (r *InterfaceAddressItem) String() string {
+	return r.description
+}