| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package l2topology |
| 4 | |
| 5 | import ( |
| 6 | "sort" |
| 7 | "strings" |
| 8 | ) |
| 9 | |
| 10 | type fdbCandidate struct { |
| 11 | mac string |
| 12 | bridgePort string |
| 13 | ifIndex int |
| 14 | statusRaw string |
| 15 | vlanID string |
| 16 | vlanName string |
| 17 | } |
| 18 | |
| 19 | func buildFDBCandidates(entries []FDBObservation, bridgePortToIfIndex map[string]int) []fdbCandidate { |
| 20 | if len(entries) == 0 { |
| 21 | return nil |
| 22 | } |
| 23 | |
| 24 | sorted := sortedFDBEntries(entries) |
| 25 | selfMACs := make(map[string]struct{}, len(sorted)) |
| 26 | for _, entry := range sorted { |
| 27 | if canonicalFDBStatus(entry.Status) != fdbStatusSelf { |
| 28 | continue |
| 29 | } |
| 30 | mac := normalizeMAC(entry.MAC) |
| 31 | if mac == "" { |
| 32 | continue |
| 33 | } |
| 34 | selfMACs[mac] = struct{}{} |
| 35 | } |
| 36 | |
| 37 | candidatesByEndpoint := make(map[string]fdbCandidate, len(sorted)) |
| 38 | duplicates := make(map[string]struct{}) |
| 39 | for _, entry := range sorted { |
| 40 | mac := normalizeMAC(entry.MAC) |
| 41 | if mac == "" { |
| 42 | continue |
| 43 | } |
| 44 | if _, isSelf := selfMACs[mac]; isSelf { |
| 45 | continue |
| 46 | } |
| 47 | if canonicalFDBStatus(entry.Status) != fdbStatusLearned { |
| 48 | continue |
| 49 | } |
| 50 | |
| 51 | bridgePort := strings.TrimSpace(entry.BridgePort) |
| 52 | ifIndex := entry.IfIndex |
| 53 | if ifIndex <= 0 && bridgePort != "" { |
| 54 | if mappedIfIndex, ok := bridgePortToIfIndex[bridgePort]; ok { |
| 55 | ifIndex = mappedIfIndex |
| 56 | } |
| 57 | } |
| 58 | |
| 59 | candidate := fdbCandidate{ |
| 60 | mac: mac, |
| 61 | bridgePort: bridgePort, |
| 62 | ifIndex: ifIndex, |
| 63 | statusRaw: strings.TrimSpace(entry.Status), |
| 64 | vlanID: strings.TrimSpace(entry.VLANID), |
| 65 | vlanName: strings.TrimSpace(entry.VLANName), |
| 66 | } |
| 67 | candidateKey := opaqueCompositeKey(mac) |
| 68 | if candidate.vlanID != "" { |
| 69 | candidateKey = opaqueCompositeKey(mac, "vlan:"+strings.ToLower(candidate.vlanID)) |
| 70 | } |
| 71 | if _, duplicated := duplicates[candidateKey]; duplicated { |
| 72 | continue |
| 73 | } |
| 74 | |
| 75 | existing, exists := candidatesByEndpoint[candidateKey] |
| 76 | if !exists { |
| 77 | candidatesByEndpoint[candidateKey] = candidate |
| 78 | continue |
| 79 | } |
| 80 | |
| 81 | if sameFDBDestination(existing, candidate) { |
| 82 | updated := existing |
| 83 | if candidate.statusRaw != "" { |
| 84 | updated.statusRaw = candidate.statusRaw |
| 85 | } |
| 86 | if updated.vlanName == "" && candidate.vlanName != "" { |
| 87 | updated.vlanName = candidate.vlanName |
| 88 | } |
| 89 | candidatesByEndpoint[candidateKey] = updated |
| 90 | continue |
| 91 | } |
| 92 | |
| 93 | delete(candidatesByEndpoint, candidateKey) |
| 94 | duplicates[candidateKey] = struct{}{} |
| 95 | } |
| 96 | |
| 97 | out := make([]fdbCandidate, 0, len(candidatesByEndpoint)) |
| 98 | for _, candidate := range candidatesByEndpoint { |
| 99 | out = append(out, candidate) |
| 100 | } |
| 101 | sort.Slice(out, func(i, j int) bool { |
| 102 | if out[i].mac != out[j].mac { |
| 103 | return out[i].mac < out[j].mac |
| 104 | } |
| 105 | if out[i].vlanID != out[j].vlanID { |
| 106 | return out[i].vlanID < out[j].vlanID |
| 107 | } |
| 108 | if out[i].ifIndex != out[j].ifIndex { |
| 109 | return out[i].ifIndex < out[j].ifIndex |
| 110 | } |
| 111 | return out[i].bridgePort < out[j].bridgePort |
| 112 | }) |
| 113 | return out |
| 114 | } |
| 115 | |
| 116 | func canonicalFDBStatus(status string) string { |
| 117 | normalized := strings.ToLower(strings.TrimSpace(status)) |
| 118 | switch normalized { |
| 119 | case "", "3", "learned", "dot1d_tp_fdb_status_learned", "dot1dtpfdbstatuslearned": |
| 120 | return fdbStatusLearned |
| 121 | case "4", "self", "dot1d_tp_fdb_status_self", "dot1dtpfdbstatusself": |
| 122 | return fdbStatusSelf |
| 123 | default: |
| 124 | if strings.Contains(normalized, "learned") { |
| 125 | return fdbStatusLearned |
| 126 | } |
| 127 | if strings.Contains(normalized, "self") { |
| 128 | return fdbStatusSelf |
| 129 | } |
| 130 | return fdbStatusIgnored |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | func sameFDBDestination(left, right fdbCandidate) bool { |
| 135 | if strings.TrimSpace(left.vlanID) != strings.TrimSpace(right.vlanID) { |
| 136 | return false |
| 137 | } |
| 138 | if left.ifIndex > 0 && right.ifIndex > 0 { |
| 139 | return left.ifIndex == right.ifIndex |
| 140 | } |
| 141 | return left.bridgePort != "" && left.bridgePort == right.bridgePort |
| 142 | } |