feat: add IP-ASN rule

constant/geodata.go

@@ -1,10 +1,12 @@
 package constant
 
 var (
+	ASNEnable         bool
 	GeodataMode       bool
 	GeoAutoUpdate     bool
 	GeoUpdateInterval int
 	GeoIpUrl          string
 	MmdbUrl           string
 	GeoSiteUrl        string
+	ASNUrl            string
 )

constant/metadata.go

@@ -133,7 +133,8 @@ type Metadata struct {
 	Type         Type       `json:"type"`
 	SrcIP        netip.Addr `json:"sourceIP"`
 	DstIP        netip.Addr `json:"destinationIP"`
-	DstGeoIP     []string   `json:"destinationGeoIP"`       // can be nil if never queried, empty slice if got no result
+	DstGeoIP     []string   `json:"destinationGeoIP"` // can be nil if never queried, empty slice if got no result
+	DstIPASN     string     `json:"destinationIPASN"`
 	SrcPort      uint16     `json:"sourcePort,string"`      // `,string` is used to compatible with old version json output
 	DstPort      uint16     `json:"destinationPort,string"` // `,string` is used to compatible with old version json output
 	InIP         netip.Addr `json:"inboundIP"`

constant/path.go

@@ -15,6 +15,7 @@ const Name = "mihomo"
 var (
 	GeositeName = "GeoSite.dat"
 	GeoipName   = "GeoIP.dat"
+	ASNName     = "ASN.mmdb"
 )
 
 // Path is used to get the configuration path
@@ -112,6 +113,25 @@ func (p *path) MMDB() string {
 	return P.Join(p.homeDir, "geoip.metadb")
 }
 
+func (p *path) ASN() string {
+	files, err := os.ReadDir(p.homeDir)
+	if err != nil {
+		return ""
+	}
+	for _, fi := range files {
+		if fi.IsDir() {
+			// 目录则直接跳过
+			continue
+		} else {
+			if strings.EqualFold(fi.Name(), "ASN.mmdb") {
+				ASNName = fi.Name()
+				return P.Join(p.homeDir, fi.Name())
+			}
+		}
+	}
+	return P.Join(p.homeDir, ASNName)
+}
+
 func (p *path) OldCache() string {
 	return P.Join(p.homeDir, ".cache")
 }

constant/rule.go

@@ -9,6 +9,7 @@ const (
 	GEOSITE
 	GEOIP
 	IPCIDR
+	IPASN
 	SrcIPCIDR
 	IPSuffix
 	SrcIPSuffix
@@ -49,6 +50,8 @@ func (rt RuleType) String() string {
 		return "GeoIP"
 	case IPCIDR:
 		return "IPCIDR"
+	case IPASN:
+		return "IPASN"
 	case SrcIPCIDR:
 		return "SrcIPCIDR"
 	case IPSuffix: