| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package l2topology |
| 4 | |
| 5 | import ( |
| 6 | "sort" |
| 7 | "strconv" |
| 8 | "strings" |
| 9 | ) |
| 10 | |
| 11 | func (b *segmentProjectionBuilder) initializeSegments() bool { |
| 12 | // Hard deterministic rule: LLDP/CDP-adjacent ports are transit ports. |
| 13 | // FDB data learned on those ports belongs to the neighbor domain and must |
| 14 | // not create parallel inferred segment paths on top of direct discovery. |
| 15 | // |
| 16 | // NOTE: |
| 17 | // switch-facing/trunk classification must not suppress endpoint ownership. |
| 18 | // It is a topology correlation/confidence signal, not a hard endpoint |
| 19 | // placement filter. |
| 20 | deterministicTransitPortKeys := buildDeterministicTransitPortKeySet(b.adjacencies, b.ifIndexByDeviceName) |
| 21 | seedMacLinks := collectBridgeMacLinkRecords(b.attachments, b.ifaceByDeviceIndex, deterministicTransitPortKeys) |
| 22 | b.rawFDBObservations = buildFDBReporterObservations(seedMacLinks) |
| 23 | model := buildBridgeDomainModel(b.bridgeLinks, seedMacLinks) |
| 24 | if len(model.domains) == 0 { |
| 25 | return false |
| 26 | } |
| 27 | |
| 28 | b.segmentMatchByID = make(map[string]Match) |
| 29 | b.segmentByID = make(map[string]*bridgeDomainSegment) |
| 30 | for _, domain := range model.domains { |
| 31 | if domain == nil { |
| 32 | continue |
| 33 | } |
| 34 | for _, segment := range domain.segments { |
| 35 | if segment == nil || len(segment.endpointIDs) == 0 { |
| 36 | continue |
| 37 | } |
| 38 | segmentID := bridgeDomainSegmentID(segment) |
| 39 | if _, exists := b.segmentByID[segmentID]; exists { |
| 40 | continue |
| 41 | } |
| 42 | b.segmentByID[segmentID] = segment |
| 43 | b.segmentIDs = append(b.segmentIDs, segmentID) |
| 44 | } |
| 45 | } |
| 46 | sort.Strings(b.segmentIDs) |
| 47 | if len(b.segmentIDs) == 0 { |
| 48 | return false |
| 49 | } |
| 50 | |
| 51 | for _, segmentID := range b.segmentIDs { |
| 52 | segment := b.segmentByID[segmentID] |
| 53 | if segment == nil { |
| 54 | continue |
| 55 | } |
| 56 | match, actor := buildBridgeSegmentActor(segmentID, segment, b.layer, b.source) |
| 57 | keys := topologyMatchIdentityKeys(actor.Match) |
| 58 | if len(keys) > 0 && !topologyIdentityIndexOverlaps(b.actorIndex, keys) { |
| 59 | addTopologyIdentityKeys(b.actorIndex, keys) |
| 60 | } |
| 61 | b.out.actors = append(b.out.actors, actor) |
| 62 | b.segmentMatchByID[segmentID] = match |
| 63 | } |
| 64 | |
| 65 | b.deviceSegmentEdgeSeen = make(map[string]struct{}) |
| 66 | b.endpointSegmentEdgeSeen = make(map[string]struct{}) |
| 67 | b.endpointSegmentCandidates = make(map[string][]string) |
| 68 | b.segmentPortKeys = make(map[string]map[string]struct{}, len(b.segmentIDs)) |
| 69 | b.segmentIfIndexes = make(map[string]map[string]struct{}, len(b.segmentIDs)) |
| 70 | b.segmentIfNames = make(map[string]map[string]struct{}, len(b.segmentIDs)) |
| 71 | for _, segmentID := range b.segmentIDs { |
| 72 | segment := b.segmentByID[segmentID] |
| 73 | if segment == nil { |
| 74 | continue |
| 75 | } |
| 76 | portKeys := make(map[string]struct{}, len(segment.ports)) |
| 77 | ifIndexes := make(map[string]struct{}, len(segment.ports)) |
| 78 | ifNames := make(map[string]struct{}, len(segment.ports)) |
| 79 | for _, port := range segment.ports { |
| 80 | if portKey := bridgePortObservationKey(port); portKey != "" { |
| 81 | portKeys[portKey] = struct{}{} |
| 82 | } |
| 83 | if portVLANKey := bridgePortObservationVLANKey(port); portVLANKey != "" { |
| 84 | portKeys[portVLANKey] = struct{}{} |
| 85 | } |
| 86 | if port.ifIndex > 0 { |
| 87 | ifIndexes[strconv.Itoa(port.ifIndex)] = struct{}{} |
| 88 | } |
| 89 | if ifName := strings.TrimSpace(port.ifName); ifName != "" { |
| 90 | ifNames[strings.ToLower(ifName)] = struct{}{} |
| 91 | } |
| 92 | } |
| 93 | b.segmentPortKeys[segmentID] = portKeys |
| 94 | b.segmentIfIndexes[segmentID] = ifIndexes |
| 95 | b.segmentIfNames[segmentID] = ifNames |
| 96 | for endpointID := range segment.endpointIDs { |
| 97 | endpointID = strings.TrimSpace(endpointID) |
| 98 | if endpointID == "" { |
| 99 | continue |
| 100 | } |
| 101 | b.endpointSegmentCandidates[endpointID] = append(b.endpointSegmentCandidates[endpointID], segmentID) |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | b.rawFDBReporterHints = buildFDBEndpointReporterHints(seedMacLinks) |
| 106 | b.fdbObservations = buildFDBReporterObservations(seedMacLinks) |
| 107 | b.fdbOwners = inferFDBEndpointOwners(b.fdbObservations, b.reporterAliases, deterministicTransitPortKeys) |
| 108 | for endpointID, owner := range inferSinglePortEndpointOwners(seedMacLinks, deterministicTransitPortKeys) { |
| 109 | if strings.TrimSpace(endpointID) == "" { |
| 110 | continue |
| 111 | } |
| 112 | if b.fdbOwners == nil { |
| 113 | b.fdbOwners = make(map[string]fdbEndpointOwner) |
| 114 | } |
| 115 | // Port-centric ownership has precedence: if a port carries a single learned |
| 116 | // MAC in the same snapshot/VLAN scope, use it to resolve ambiguous placement. |
| 117 | b.fdbOwners[endpointID] = owner |
| 118 | if b.out.endpointDirectOwners == nil { |
| 119 | b.out.endpointDirectOwners = make(map[string]fdbEndpointOwner) |
| 120 | } |
| 121 | b.out.endpointDirectOwners[endpointID] = owner |
| 122 | } |
| 123 | |
| 124 | b.deviceIdentityByID = buildDeviceIdentityKeySetByID(b.deviceByID, b.adjacencies, b.ifaceByDeviceIndex) |
| 125 | b.reporterSegmentIndex = buildSegmentReporterIndex(b.segmentIDs, b.segmentByID) |
| 126 | b.aliasOwnerIDs = buildFDBAliasOwnerMap(b.reporterAliases) |
| 127 | b.managedDeviceIDs = make(map[string]struct{}, len(b.deviceByID)) |
| 128 | for deviceID := range b.deviceByID { |
| 129 | deviceID = strings.TrimSpace(deviceID) |
| 130 | if deviceID == "" { |
| 131 | continue |
| 132 | } |
| 133 | b.managedDeviceIDs[deviceID] = struct{}{} |
| 134 | } |
| 135 | b.managedDeviceIDList = sortedTopologySet(b.managedDeviceIDs) |
| 136 | b.allowedEndpointBySegment = make(map[string]map[string]struct{}) |
| 137 | b.strictEndpointBySegment = make(map[string]map[string]struct{}) |
| 138 | b.probableEndpointBySegment = make(map[string]map[string]struct{}) |
| 139 | b.probableAttachmentModes = make(map[string]map[string]string) |
| 140 | b.assignedEndpoints = make(map[string]struct{}, len(b.endpointMatchByID)) |
| 141 | |
| 142 | return true |
| 143 | } |