| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package l2topology |
| 4 | |
| 5 | import ( |
| 6 | "encoding/hex" |
| 7 | "fmt" |
| 8 | "net/netip" |
| 9 | "strconv" |
| 10 | "strings" |
| 11 | ) |
| 12 | |
| 13 | func canonicalBridgeAddr(value, fallback string) string { |
| 14 | if mac := normalizeMAC(value); mac != "" && mac != "00:00:00:00:00:00" { |
| 15 | return mac |
| 16 | } |
| 17 | if mac := normalizeMAC(fallback); mac != "" && mac != "00:00:00:00:00:00" { |
| 18 | return mac |
| 19 | } |
| 20 | return "" |
| 21 | } |
| 22 | |
| 23 | func primaryL2MACIdentity(chassisID, baseBridgeAddress string) string { |
| 24 | for _, candidate := range []string{chassisID, baseBridgeAddress} { |
| 25 | if mac := normalizeMAC(candidate); mac != "" && mac != "00:00:00:00:00:00" { |
| 26 | return mac |
| 27 | } |
| 28 | } |
| 29 | return "" |
| 30 | } |
| 31 | |
| 32 | func canonicalIP(v string) string { |
| 33 | if ip := parseAddr(v); ip.IsValid() { |
| 34 | return ip.String() |
| 35 | } |
| 36 | if ip := parseAddr(decodeHexIP(v)); ip.IsValid() { |
| 37 | return ip.String() |
| 38 | } |
| 39 | return "" |
| 40 | } |
| 41 | |
| 42 | func parseAddr(v string) netip.Addr { |
| 43 | addr, err := netip.ParseAddr(strings.TrimSpace(v)) |
| 44 | if err != nil { |
| 45 | return netip.Addr{} |
| 46 | } |
| 47 | return addr.Unmap() |
| 48 | } |
| 49 | |
| 50 | func decodeHexIP(v string) string { |
| 51 | bs := decodeHexBytes(v) |
| 52 | if len(bs) == 4 { |
| 53 | addr, ok := netip.AddrFromSlice(bs) |
| 54 | if ok { |
| 55 | return addr.Unmap().String() |
| 56 | } |
| 57 | } |
| 58 | if len(bs) == 16 { |
| 59 | addr, ok := netip.AddrFromSlice(bs) |
| 60 | if ok { |
| 61 | return addr.String() |
| 62 | } |
| 63 | } |
| 64 | return "" |
| 65 | } |
| 66 | |
| 67 | func decodeHexBytes(v string) []byte { |
| 68 | clean := strings.ToLower(strings.TrimSpace(v)) |
| 69 | clean = strings.TrimPrefix(clean, "0x") |
| 70 | if clean == "" { |
| 71 | return nil |
| 72 | } |
| 73 | |
| 74 | if strings.ContainsAny(clean, ":-. \t") { |
| 75 | parts := strings.FieldsFunc(clean, func(r rune) bool { |
| 76 | return r == ':' || r == '-' || r == '.' || r == ' ' || r == '\t' |
| 77 | }) |
| 78 | if len(parts) == 0 { |
| 79 | return nil |
| 80 | } |
| 81 | if bs := decodeGroupedHexParts(parts); len(bs) != 0 { |
| 82 | return bs |
| 83 | } |
| 84 | |
| 85 | out := make([]byte, 0, len(parts)) |
| 86 | for _, part := range parts { |
| 87 | part = strings.TrimSpace(part) |
| 88 | if part == "" { |
| 89 | continue |
| 90 | } |
| 91 | if len(part) > 2 { |
| 92 | return nil |
| 93 | } |
| 94 | if len(part) == 1 { |
| 95 | part = "0" + part |
| 96 | } |
| 97 | b, err := hex.DecodeString(part) |
| 98 | if err != nil || len(b) != 1 { |
| 99 | return nil |
| 100 | } |
| 101 | out = append(out, b[0]) |
| 102 | } |
| 103 | if len(out) == 0 { |
| 104 | return nil |
| 105 | } |
| 106 | return out |
| 107 | } |
| 108 | |
| 109 | if len(clean)%2 == 1 { |
| 110 | clean = "0" + clean |
| 111 | } |
| 112 | bs, err := hex.DecodeString(clean) |
| 113 | if err != nil { |
| 114 | return nil |
| 115 | } |
| 116 | return bs |
| 117 | } |
| 118 | |
| 119 | func decodeGroupedHexParts(parts []string) []byte { |
| 120 | var joined strings.Builder |
| 121 | anyWidePart := false |
| 122 | |
| 123 | for _, part := range parts { |
| 124 | part = strings.TrimSpace(part) |
| 125 | if part == "" { |
| 126 | continue |
| 127 | } |
| 128 | if len(part)%2 != 0 { |
| 129 | return nil |
| 130 | } |
| 131 | if len(part) > 2 { |
| 132 | anyWidePart = true |
| 133 | } |
| 134 | joined.WriteString(part) |
| 135 | } |
| 136 | |
| 137 | if !anyWidePart || joined.Len() == 0 { |
| 138 | return nil |
| 139 | } |
| 140 | |
| 141 | bs, err := hex.DecodeString(joined.String()) |
| 142 | if err != nil || len(bs) == 0 { |
| 143 | return nil |
| 144 | } |
| 145 | return bs |
| 146 | } |
| 147 | |
| 148 | func normalizeMAC(v string) string { |
| 149 | v = strings.TrimSpace(v) |
| 150 | if v == "" { |
| 151 | return "" |
| 152 | } |
| 153 | |
| 154 | if bs := parseDottedDecimalBytes(v); len(bs) == 6 { |
| 155 | return formatMAC(bs) |
| 156 | } |
| 157 | if bs := decodeHexBytes(v); len(bs) == 6 { |
| 158 | return formatMAC(bs) |
| 159 | } |
| 160 | return "" |
| 161 | } |
| 162 | |
| 163 | func parseDottedDecimalBytes(v string) []byte { |
| 164 | parts := strings.Split(strings.TrimSpace(v), ".") |
| 165 | if len(parts) != 6 { |
| 166 | return nil |
| 167 | } |
| 168 | out := make([]byte, 0, 6) |
| 169 | for _, part := range parts { |
| 170 | n, err := strconv.Atoi(strings.TrimSpace(part)) |
| 171 | if err != nil || n < 0 || n > 255 { |
| 172 | return nil |
| 173 | } |
| 174 | out = append(out, byte(n)) |
| 175 | } |
| 176 | return out |
| 177 | } |
| 178 | |
| 179 | func formatMAC(bs []byte) string { |
| 180 | if len(bs) != 6 { |
| 181 | return "" |
| 182 | } |
| 183 | parts := make([]string, 0, 6) |
| 184 | for _, b := range bs { |
| 185 | parts = append(parts, fmt.Sprintf("%02x", b)) |
| 186 | } |
| 187 | return strings.Join(parts, ":") |
| 188 | } |