|
| 1 | +package core |
| 2 | + |
| 3 | +import ( |
| 4 | + "errors" |
| 5 | + "fmt" |
| 6 | + "github.com/edgecomllc/eupf/cmd/core/service" |
| 7 | + "github.com/edgecomllc/eupf/cmd/ebpf" |
| 8 | + "github.com/rs/zerolog/log" |
| 9 | + "github.com/wmnsk/go-pfcp/ie" |
| 10 | +) |
| 11 | + |
| 12 | +type PDRCreationContext struct { |
| 13 | + Session *Session |
| 14 | + ResourceManager *service.ResourceManager |
| 15 | + TEIDCache map[uint8]uint32 |
| 16 | +} |
| 17 | + |
| 18 | +func NewPDRCreationContext(session *Session, resourceManager *service.ResourceManager) *PDRCreationContext { |
| 19 | + return &PDRCreationContext{ |
| 20 | + Session: session, |
| 21 | + ResourceManager: resourceManager, |
| 22 | + TEIDCache: make(map[uint8]uint32), |
| 23 | + } |
| 24 | +} |
| 25 | + |
| 26 | +func (pcc *PDRCreationContext) extractPDR(pdr *ie.IE, spdrInfo *SPDRInfo) error { |
| 27 | + if outerHeaderRemoval, err := pdr.OuterHeaderRemovalDescription(); err == nil { |
| 28 | + spdrInfo.PdrInfo.OuterHeaderRemoval = outerHeaderRemoval |
| 29 | + } |
| 30 | + if farid, err := pdr.FARID(); err == nil { |
| 31 | + spdrInfo.PdrInfo.FarId = pcc.getFARID(farid) |
| 32 | + } |
| 33 | + if qerid, err := pdr.QERID(); err == nil { |
| 34 | + spdrInfo.PdrInfo.QerId = pcc.getQERID(qerid) |
| 35 | + } |
| 36 | + |
| 37 | + pdi, err := pdr.PDI() |
| 38 | + if err != nil { |
| 39 | + return fmt.Errorf("PDI IE is missing") |
| 40 | + } |
| 41 | + |
| 42 | + if sdfFilter, err := pdr.SDFFilter(); err == nil { |
| 43 | + if sdfFilterParsed, err := ParseSdfFilter(sdfFilter.FlowDescription); err == nil { |
| 44 | + spdrInfo.PdrInfo.SdfFilter = &sdfFilterParsed |
| 45 | + } else { |
| 46 | + log.Error().Msgf("SDFFilter err: %v", err) |
| 47 | + return err |
| 48 | + } |
| 49 | + } |
| 50 | + |
| 51 | + if teidPdiId := findIEindex(pdi, 21); teidPdiId != -1 { // IE Type F-TEID |
| 52 | + if fteid, err := pdi[teidPdiId].FTEID(); err == nil { |
| 53 | + var teid = fteid.TEID |
| 54 | + if fteid.HasCh() { |
| 55 | + var allocate = true |
| 56 | + if fteid.HasChID() { |
| 57 | + if teidFromCache, ok := pcc.hasTEIDCache(fteid.ChooseID); ok { |
| 58 | + allocate = false |
| 59 | + teid = teidFromCache |
| 60 | + spdrInfo.Allocated = true |
| 61 | + } |
| 62 | + } |
| 63 | + if allocate { |
| 64 | + allocatedTeid, err := pcc.getFTEID(pcc.Session.RemoteSEID, spdrInfo.PdrID) |
| 65 | + if err != nil { |
| 66 | + log.Error().Msgf("AllocateTEID err: %v", err) |
| 67 | + return fmt.Errorf("can't allocate TEID: %s", causeToString(ie.CauseNoResourcesAvailable)) |
| 68 | + } |
| 69 | + teid = allocatedTeid |
| 70 | + spdrInfo.Allocated = true |
| 71 | + if fteid.HasChID() { |
| 72 | + pcc.setTEIDCache(fteid.ChooseID, teid) |
| 73 | + } |
| 74 | + } |
| 75 | + } |
| 76 | + spdrInfo.Teid = teid |
| 77 | + return nil |
| 78 | + } |
| 79 | + return fmt.Errorf("F-TEID IE is missing") |
| 80 | + } else if ueIP, err := pdr.UEIPAddress(); err == nil { |
| 81 | + if ueIP.IPv4Address != nil { |
| 82 | + spdrInfo.Ipv4 = cloneIP(ueIP.IPv4Address) |
| 83 | + } else if ueIP.IPv6Address != nil { |
| 84 | + spdrInfo.Ipv6 = cloneIP(ueIP.IPv6Address) |
| 85 | + } else { |
| 86 | + return fmt.Errorf("UE IP Address IE is missing") |
| 87 | + } |
| 88 | + |
| 89 | + return nil |
| 90 | + } else { |
| 91 | + log.Info().Msg("Both F-TEID IE and UE IP Address IE are missing") |
| 92 | + return err |
| 93 | + } |
| 94 | +} |
| 95 | + |
| 96 | +func (pcc *PDRCreationContext) deletePDR(spdrInfo SPDRInfo, mapOperations ebpf.ForwardingPlaneController) error { |
| 97 | + if spdrInfo.Ipv4 != nil { |
| 98 | + if err := mapOperations.DeletePdrDownlink(spdrInfo.Ipv4); err != nil { |
| 99 | + return fmt.Errorf("Can't delete IPv4 PDR: %s", err.Error()) |
| 100 | + } |
| 101 | + } else if spdrInfo.Ipv6 != nil { |
| 102 | + if err := mapOperations.DeleteDownlinkPdrIp6(spdrInfo.Ipv6); err != nil { |
| 103 | + return fmt.Errorf("Can't delete IPv6 PDR: %s", err.Error()) |
| 104 | + } |
| 105 | + } else { |
| 106 | + if err := mapOperations.DeletePdrUplink(spdrInfo.Teid); err != nil { |
| 107 | + return fmt.Errorf("Can't delete GTP PDR: %s", err.Error()) |
| 108 | + } |
| 109 | + } |
| 110 | + if spdrInfo.Teid != 0 { |
| 111 | + pcc.ResourceManager.FTEIDM.ReleaseTEID(pcc.Session.RemoteSEID) |
| 112 | + } |
| 113 | + return nil |
| 114 | +} |
| 115 | + |
| 116 | +func (pcc *PDRCreationContext) getFARID(farid uint32) uint32 { |
| 117 | + return pcc.Session.GetFar(farid).GlobalId |
| 118 | +} |
| 119 | + |
| 120 | +func (pcc *PDRCreationContext) getQERID(qerid uint32) uint32 { |
| 121 | + return pcc.Session.GetQer(qerid).GlobalId |
| 122 | +} |
| 123 | + |
| 124 | +func (pcc *PDRCreationContext) getFTEID(seID uint64, pdrID uint32) (uint32, error) { |
| 125 | + if pcc.ResourceManager == nil { |
| 126 | + return 0, errors.New("resource manager is nil") |
| 127 | + } else { |
| 128 | + if pcc.ResourceManager.FTEIDM == nil { |
| 129 | + return 0, errors.New("FTEID manager is nil") |
| 130 | + } |
| 131 | + } |
| 132 | + allocatedTeid, err := pcc.ResourceManager.FTEIDM.AllocateTEID(seID, pdrID) |
| 133 | + if err != nil { |
| 134 | + log.Error().Msgf("AllocateTEID err: %v", err) |
| 135 | + return 0, fmt.Errorf("Can't allocate TEID: %s", causeToString(ie.CauseNoResourcesAvailable)) |
| 136 | + } |
| 137 | + return allocatedTeid, nil |
| 138 | +} |
| 139 | + |
| 140 | +func (pcc *PDRCreationContext) hasTEIDCache(chooseID uint8) (uint32, bool) { |
| 141 | + teid, ok := pcc.TEIDCache[chooseID] |
| 142 | + return teid, ok |
| 143 | +} |
| 144 | + |
| 145 | +func (pcc *PDRCreationContext) setTEIDCache(chooseID uint8, teid uint32) { |
| 146 | + pcc.TEIDCache[chooseID] = teid |
| 147 | +} |
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