PFCP in Go 3GPP流CUPSをGoで実装する

Transcript

1. Yoshiyuki Kurauchi / ENOG63 Meeting (2020.6.26)
   PFCP in Go
   3GPPྲྀCUPSΛGoͰ࣮૷͢Δ
   #4G #5G #CUPS #PFCP #ϓϩτί
   ϧLOVE #3GPP͓ͦΖ͍͠ࢠ #ΘΓ
   ͱϓϩάϥϛϯάدΓ #Go #Gopher
   ͸͔Θ͍͍ #͓ख΍ΘΒ͔ʹ
   

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2. Table of Contents
   • ࣗݾ঺հͳͲ
   
   • CUPS/PFCPͱ͸
   
   • PFCPΛGoͰ࣮૷ͨ͠࿩
   

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3. ࣗݾ঺հͱ͔
   #ฏ੒ݩ೥େࡕੜ·Ε #ฌݿ #ಸྑ #ੴ઒
   
   #ਆಸ઒ #ࠓ͸ϤίϋϚ #͸΍͘ւ֎ཱྀߦ
   ͍ͨ͠ #Ϗʔϧ #΢ΟεΩʔ #೔ຊञ #
   ϩοΫ #ϝλϧ #ϩʔυόΠΫ
   

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4. ࣗݾ঺հ
   • ৬ྺ
   
   • 2013.02 - 2015.01: SES (NWӡ༻ɺݕূ΍Β)
   
   • 2015.02 - 2018.10: ঎ࣾܥ (ςϨίϜؔ࿈੡඼ɾαʔϏε୲౰)
   
   • 2018.12 - Now: LTE over IPͳձࣾ (։ൃΛத৺ʹ͍Ζ͍Ζ)
   
   • ݴޠ
   
   • Go, Python, C/C++, Swift, etc.
   
   • ΤσΟλ͸VSCode೿
   https://wmnsk.com/about/
   Twitter: @wmnskdmms
   GitHub: @wmnsk
   

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5. OSS׆ಈͳͲ
   • ࣗ࡞ϥΠϒϥϦ (جຊGo)
   
   • ओʹNWϓϩτίϧ
   
   • 3G > 4G > 5G… ϨΨγʔେ޷͖ʂ
   
   • CNF Testbedʹgo-gtp࠾༻
   
   • ίϯτϦϏϡʔγϣϯྫ
   
   • Wireshark
   
   • Linux kernel driver (GTP-U) ͳͲ
   https://wmnsk.com/posts/20200116_gw-tester/
   https://github.com/wmnsk
   

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6. CUPS/PCFPͱ͸ʁ
   #ϓϦϯλ͡Όͳ͍Α #಄ࣈޠͷཛྷ #
   ΍ͬͯ͘ΕΔͥ3GPP #Ͳ͏ͯ͜͠͏
   ͳͬͨ #Ͳ͏ͯ͜͠͏ͳͬͨ #Ͳ͏
   ͯ͜͠͏ͳͬͨ
   

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7. CUPSͱ͸ʁ
   • Control and User Plane Separation
   
   • Rel14(2017): 4G/LTE຤ظ ʙ Rel16(2020.4): 5G΋औΓࠐΜͰઈࢍංେԽத
   
   • 4GͰ͸్த͔Βಋೖ
   
   • 5G͔Β͸ωΠςΟϒ
   
   

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8. CUPSͱ͸ʁ
   • ༻ޠ
   
   • CP/UP function: C-Planeଆϊʔυ / U-Planeଆϊʔυ
   
   • Association: ϊʔυؒʹ͓͚ΔϐΞϦϯά
   
   • Session: ݸผͷ੍ޚద༻୯Ґ
   
   • Rule: ੍ޚϧʔϧ (ޙड़)
   CP function
   UP function
   ⚠
   
   ҎޙɺUP functionΛ౓ʑUPFͱུ͠·͕͢ɺ
   
   5Gͷϊʔυͷ͜ͱͰ͸͋Γ·ͤΜɻ
   

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9. CUPSͱ͸ʁ
   • ༻ޠ
   
   • CP/UP function: C-Planeଆϊʔυ / U-Planeଆϊʔυ
   
   • Association: ϊʔυؒʹ͓͚ΔϐΞϦϯά
   
   • Session: ݸผͷ੍ޚద༻୯Ґ
   
   • Rule: ੍ޚϧʔϧ (ޙड़)
   Association
   

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10. CUPSͱ͸ʁ
    • ༻ޠ
    
    • CP/UP function: C-Planeଆϊʔυ / U-Planeଆϊʔυ
    
    • Association: ϊʔυؒʹ͓͚ΔϐΞϦϯά
    
    • Session: ݸผͷ੍ޚద༻୯Ґ
    
    • Rule: ੍ޚϧʔϧ (ޙड़)
    Session
    

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11. PFCPͱ͸ʁ
    • Packet Forwarding Control Protocol ͷ͜ͱ
    
    • CPFͱUPFͷίϛϡχέʔγϣϯํ๏ɾखଓ͖Λنఆ
    
    • ؔ࿈Spec: TS 23.214(Architecture), TS 29.244(Protocol)
    
    • ౰ॳ͸EPCͰ࢖ΘΕΔI/F໊͔Β”Sx”ͱݺ͹Ε͓ͯΓɺະͩʹͦͷ໊࢒͕ࢄ
    ݟ͞ΕΔ
    

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12. PFCPͱ͸ʁ
    • ΍ΓͱΓ͞ΕΔ৘ใ
    
    • ϐΞಉ࢜ͷ৘ใ (ରԠػೳɺࢮ׆؂ࢹͳͲ)
    
    • Ճೖऀͷύέοτ͕UP functionʹಧ͍͔ͯΒग़͍ͯ͘·Ͱʹద༻͞ΕΔ΂
    ੍͖ޚॲཧͷ৘ใ
    

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13. PFCPͱ͸ʁ
    • ΍ΓͱΓ͞ΕΔ৘ใ
    
    • ϐΞಉ࢜ͷ৘ใ (ରԠػೳɺࢮ׆؂ࢹͳͲ)
    
    • Ճೖऀͷύέοτ͕UP functionʹಧ͍͔ͯΒग़͍ͯ͘·Ͱʹద༻͞ΕΔ΂
    ੍͖ޚॲཧͷ৘ใ
    
    

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14. • جຊγʔέϯε
    
    • §6.2 PFCP Node Related Procedures
    
    • AssociationΛுͬͨΓ͢Δ
    
    • §6.3 PFCP Session Related Procedures
    
    • ηογϣϯɺ੍ޚϧʔϧΛ؅ཧ͢Δ
    PFCPͱ͸ʁ
    

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15. • جຊγʔέϯε
    
    • §6.2 PFCP Node Related Procedures
    
    • Heartbeat Procedure
    
    • Load/Overload Control Procedure
    
    • PFD Management Procedure
    • Association Setup/Update/Release Procedure
    
    • Node Report Procedure
    
    PFCPͱ͸ʁ
    CPF UPF
    Association Setup Request
    Association Setup Response
    Heartbeat Request/Response
    Association Release Request
    Association Release Response
    (Session-related messages)
    

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16. • جຊγʔέϯε
    
    • §6.2 PFCP Node Related Procedures
    
    • Heartbeat Procedure
    
    • Load/Overload Control Procedure
    
    • Overload Control Procedure
    
    • PFD Management Procedure
    • Association Setup/Update/Release
    
    • Node Report Procedure
    PFCPͱ͸ʁ
    CPF UPF
    Association Setup Request
    Association Setup Response
    Heartbeat Request/Response
    Association Release Request
    Association Release Response
    (Session-related messages)
    

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17. • جຊγʔέϯε
    
    • §6.3 PFCP Session Related Procedures
    
    • Session … Procedure
    
    • Establishment
    
    • Modification
    
    • Deletion
    
    • Report
    
    PFCPͱ͸ʁ
    CPF UPF
    Session Establishment Request
    Session Establishment Response
    Session Modification Request/Response
    Session Deletion Request
    Session Deletion Response
    (enforcing rules)
    Association
    

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18. • جຊγʔέϯε
    
    • §6.3 PFCP Session Related Procedures
    
    • Sessio
    
    • Establishment
    
    • Modification
    
    • Deletion
    
    • Report
    
    PFCPͱ͸ʁ
    CPF UPF
    Session Establishment Request
    Session Establishment Response
    Session Modification Request/Response
    Session Deletion Request
    Session Deletion Response
    (enforcing rules)
    Association
    

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19. PFCPͱ͸ʁ
    • ͜͜ͰύέοτΛ͝ཡ͍ͩ͘͞
    
    • Session Establishment Request
    
    • Create PDR
    
    • …
    
    • PDI
    
    • …
    
    • Create FAR
    
    • …
    https://gist.github.com/wmnsk/3e8073d3404d8eb36f33300b7a8babe5
    

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20. PFCPͱ͸ʁ
    • ͜͜ͰύέοτΛ͝ཡ͍ͩ͘͞
    
    • Session Establishment Request
    
    • Create PDR
    
    • …
    
    • PDI
    
    • …
    
    • Create FAR
    
    • …
    https://gist.github.com/wmnsk/3e8073d3404d8eb36f33300b7a8babe5
    

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21. PFCPͱ͸ʁ
    • ੍ޚॲཧ
    
    • Packet Detection Rule
    
    • Forwarding Action Rule
    
    • Usage Reporting Rule
    
    • QoS Enforcement Rule
    
    • Buffering Action Rule
    
    • Multi-Access Rule
    • େ·͔ͳྲྀΕ
    
    • PDRʹج͍ͮͯύέοτΛৼΓ෼͚Δ
    
    • సૹઌΛܾΊΔ (υϩοϓͱ͔΋͋Δ)
    
    • CPF͕FARͰࢦࣔ͢Δ
    
    • UPFଆʹ͋ΔPredefinedϧʔϧΛ࢖͏
    
    • ͦͷଞϧʔϧΛద༻͢Δ
    
    • Usage ReportɺQoS EnforcementͳͲ
    

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22. PFCPͱ͸ʁ
    • ੍ޚॲཧ
    
    • Packet Detection Rule
    
    • Forwarding Action Rule
    
    • Usage Reporting Rule
    
    • QoS Enforcement Rule
    
    • Buffering Action Rule
    
    • Multi-Access Rule
    • ύέοτΛ෼ྨ͢ΔϧʔϧͷΑ͏ͳ΋ͷ
    
    • Outer (GTP-Uϔομ) / InnerͲͪΒ΋ݟΔ
    
    • GTPͷTEID
    
    • Flow Description ͳͲ
    
    • PDR͕ܾ·ΔͱɺFAR, URR, QER, MAR΋
    Ұҙʹܾ·Δ
    

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23. PFCPͱ͸ʁ
    • ੍ޚॲཧ
    
    • Packet Detection Rule
    
    • Forwarding Action Rule
    
    • Usage Reporting Rule
    
    • QoS Enforcement Rule
    
    • Buffering Action Rule
    
    • Multi-Access Rule
    • సૹؔ࿈ͷϧʔϧ
    
    • Drop, Forward, Buffer, DuplicateͳͲɺUPF
    ଆ͕औΔ΂͖ΞΫγϣϯΛܾΊΔ
    
    • Header EnrichmentͳΜ͔΋ʂ
    

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24. PFCPͱ͸ʁ
    • ੍ޚॲཧ
    
    • Packet Detection Rule
    
    • Forwarding Action Rule
    
    • Usage Reporting Rule
    
    • QoS Enforcement Rule
    
    • Buffering Action Rule
    
    • Multi-Access Rule
    • Usage Reporting Ruleɿ
    
    • ར༻ঢ়گΛͲ͏Χ΢ϯτ͢Δ͔
    
    • ͲͷλΠϛϯάͰϨϙʔτ͢Δ͔ ͳͲ
    
    • QoS Enforcement Ruleɿ
    
    • ଳҬ੍ޚ (MBR/GBR, Packet rate)
    
    • τϥϑΟοΫϚʔΩϯά ͳͲ
    

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25. PFCPͱ͸ʁ
    • ੍ޚॲཧ
    
    • Packet Detection Rule
    
    • Forwarding Action Rule
    
    • Usage Reporting Rule
    
    • QoS Enforcement Rule
    
    • Buffering Action Rule
    
    • Multi-Access Rule
    • ׂѪ͠·͢
    
    • ࡉׂ͔͍ʹɺ໘ന͘΋ͳ͍ͷͰ
    
    • ͦͯ͠ࢲ͕ͪΌΜͱΘ͔ͬͯͳ͍ͷͰ
    
    • ͦΕͧΕɺTS 29.244 5.2.4, 5.2.7Λࢀর
    
    • ͋ͱSRR(Session Reporting Rule / 5.2.8)ͳ
    Μ͔΋͋Γ·͢
    

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26. PFCPΛGoͰ࣮૷͢Δ
    #΅͘ͷ͔Μ͕͍͖͑ͨ͞ΐ͏ͷ
    PFCP࣮૷ #The୯७࡞ۀ #஍ຯΦϒ
    ஍ຯ #ࡉ͔͍࿩ଟΊ #τϥοϓ͸શ෦
    ౿Μͩ #Ұॹʹ࡞Γ·ͤΜ͔ #ϝϯื
    

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27. go-pfcp: PFCP implementation in Golang
    • PFCPΛGoϓϩάϥϜ͔Βѻ͏ͨΊͷϥΠϒϥϦ
    
    • Message / IEͷϑΥʔϚοτ
    
    • ͔ΜͨΜʹύέοτΛ࡞Δ͜ͱ͕Ͱ͖Δ
    
    • TS 29.244 V16.3.1(2020-04) ࣌఺ͷ΋ͷ͢΂࣮ͯ૷ࡁΈ (ͨͿΜ)
    
    • Association / SessionΛखܰʹѻ͏ͨΊͷAPI
    
    • ઀ଓ͢ΔͨΊͷؔ਺΍ϐΞͷࣗಈ؅ཧͳͲ
    
    • Ӷҙ࣮૷தɾɾɾ
    https://github.com/wmnsk/go-pfcp
    

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28. go-pfcp: PFCP implementation in Golang
    • ͳͥ࡞ͬͨͷ͔
    
    • ͨͩͷझຯ
    
    • ·ͩSpec͕ൺֱతബ͔ͬͨͷͰ
    https://github.com/wmnsk/go-pfcp
    

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29. go-pfcp: PFCP implementation in Golang
    • ࢖͍ํ1: ϝοηʔδͷΤϯίʔυ
    asr := message.NewAssociationSetupRequest(
    ie.NewNodeID("", "", "go-pfcp.epc.3gppnetwork.org"),
    ie.NewRecoveryTimeStamp(time.Date(2019, time.January, 1, 0, 0, 0, 0, time.UTC)),
    ie.NewUPFunctionFeatures(0x01, 0x02),
    ie.NewAlternativeSMFIPAddress(net.ParseIP("127.0.0.1"), net.ParseIP("2001::1")),
    ie.NewSMFSetID("go-pfcp.epc.3gppnetwork.org"),
    ie.NewClockDriftControlInformation(
    ie.NewTimeOffsetThreshold(10*time.Second),
    ),
    // …
    )
    b, err := asr.Marshal() // serializes req into []byte
    n, err := udpConn.WriteTo(b, raddr) // sends serialized req over UDP
    

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30. go-pfcp: PFCP implementation in Golang
    • ࢖͍ํ1: ϝοηʔδͷΤϯίʔυ
    asr := message.NewAssociationSetupRequest(
    ie.NewNodeID("", "", "go-pfcp.epc.3gppnetwork.org"),
    ie.NewRecoveryTimeStamp(time.Date(2019, time.January, 1, 0, 0, 0, 0, time.UTC)),
    ie.NewUPFunctionFeatures(0x01, 0x02),
    ie.NewAlternativeSMFIPAddress(net.ParseIP("127.0.0.1"), net.ParseIP("2001::1")),
    ie.NewSMFSetID("go-pfcp.epc.3gppnetwork.org"),
    ie.NewClockDriftControlInformation(
    ie.NewTimeOffsetThreshold(10*time.Second),
    ),
    // …
    )
    b, err := asr.Marshal() // serializes req into []byte
    n, err := udpConn.WriteTo(b, raddr) // sends serialized req over UDP
    શͯͷmessage / IEͷίϯετϥΫλ
    

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31. go-pfcp: PFCP implementation in Golang
    • ࢖͍ํ1: ϝοηʔδͷΤϯίʔυ
    asr := message.NewAssociationSetupRequest(
    ie.NewNodeID("", "", "go-pfcp.epc.3gppnetwork.org"),
    ie.NewRecoveryTimeStamp(time.Date(2019, time.January, 1, 0, 0, 0, 0, time.UTC)),
    ie.NewUPFunctionFeatures(0x01, 0x02),
    ie.NewAlternativeSMFIPAddress(net.ParseIP("127.0.0.1"), net.ParseIP("2001::1")),
    ie.NewSMFSetID("go-pfcp.epc.3gppnetwork.org"),
    ie.NewClockDriftControlInformation(
    ie.NewTimeOffsetThreshold(10*time.Second),
    ),
    // …
    )
    b, err := asr.Marshal() // serializes req into []byte
    n, err := udpConn.WriteTo(b, raddr) // sends serialized req over UDP
    ֤छIEͷ࣋ͭ஋ͱGoͷܕ͕ରԠ (Ͱ͖Δ͚ͩ)
    
    ϓϦϛςΟϒ͚ͩͰͳ͘time.Time΍net.IPͳͲ
    

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32. go-pfcp: PFCP implementation in Golang
    • ࢖͍ํ1: ϝοηʔδͷΤϯίʔυ
    asr := message.NewAssociationSetupRequest(
    ie.NewNodeID("", "", "go-pfcp.epc.3gppnetwork.org"),
    ie.NewRecoveryTimeStamp(time.Date(2019, time.January, 1, 0, 0, 0, 0, time.UTC)),
    ie.NewUPFunctionFeatures(0x01, 0x02),
    ie.NewAlternativeSMFIPAddress(net.ParseIP("127.0.0.1"), net.ParseIP("2001::1")),
    ie.NewSMFSetID("go-pfcp.epc.3gppnetwork.org"),
    ie.NewClockDriftControlInformation(
    ie.NewTimeOffsetThreshold(10*time.Second),
    ),
    // …
    )
    b, err := asr.Marshal() // serializes req into []byte
    n, err := udpConn.WriteTo(b, raddr) // sends serialized req over UDP
    []byteܕʹγϦΞϥΠζͯ͠ૹ৴
    

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33. go-pfcp: PFCP implementation in Golang
    • ࢖͍ํ1: ϝοηʔδͷΤϯίʔυ
    asr := message.NewAssociationSetupRequest(
    ie.NewNodeID("", "", "go-pfcp.epc.3gppnetwork.org"),
    ie.NewRecoveryTimeStamp(time.Date(2019, time.January, 1, 0, 0, 0, 0, time.UTC)),
    ie.NewUPFunctionFeatures(0x01, 0x02),
    ie.NewAlternativeSMFIPAddress(net.ParseIP("127.0.0.1"), net.ParseIP("2001::1")),
    ie.NewSMFSetID("go-pfcp.epc.3gppnetwork.org"),
    ie.NewClockDriftControlInformation(
    ie.NewTimeOffsetThreshold(10*time.Second),
    ),
    // …
    )
    b, err := asr.Marshal() // serializes req into []byte
    n, err := udpConn.WriteTo(b, raddr) // sends serialized req over UDP
    ςετίʔυ͕ࢀߟʹͳΓ·͢
    https://github.com/wmnsk/go-pfcp/blob/master/message/association-setup-request_test.go
    

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34. go-pfcp: PFCP implementation in Golang
    • ࢖͍ํ2: ϝοηʔδͷσίʔυ
    msg, err := message.Unmarshal(b)
    asr, ok := msg.(*messages.AssociationSetupRequest)
    // single value IE: "go-pfcp.epc.3gppnetwork.org" in string
    field := asr.NodeID // accesses to a field named NodeID in AssociationSetupRequest
    nodeID, err := field.NodeID() // retrieves value in Go-friendly type
    // flags: BUCP bit is set to 1
    if asr.UPFunctionFeatures.HasBUCP() { … }
    // complex: returns a struct named XyzFields
    fields, err := AlternativeSMFIPAddress() // AlternativeSMFIPAddressFields struct
    v4 := fields.IPv4Address // 127.0.0.1 in net.IP
    v6 := fields.IPv6Address // 2001::1 in net.IP
    

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35. go-pfcp: PFCP implementation in Golang
    • ࢖͍ํ2: ϝοηʔδͷσίʔυ
    msg, err := message.Unmarshal(b)
    asr, ok := msg.(*messages.AssociationSetupRequest)
    // single value IE: "go-pfcp.epc.3gppnetwork.org" in string
    field := asr.NodeID // accesses to a field named NodeID in AssociationSetupRequest
    nodeID, err := field.NodeID() // retrieves value in Go-friendly type
    // flags: BUCP bit is set to 1
    if asr.UPFunctionFeatures.HasBUCP() { … }
    // complex: returns a struct named XyzFields
    fields, err := AlternativeSMFIPAddress() // AlternativeSMFIPAddressFields struct
    v4 := fields.IPv4Address // 127.0.0.1 in net.IP
    v6 := fields.IPv6Address // 2001::1 in net.IP
    []byteΛmessage.MessageΠϯλʔϑΣΠεʹ
    
    Unmarshal → ಛఆͷϝοηʔδܕʹassert
    

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36. go-pfcp: PFCP implementation in Golang
    • ࢖͍ํ2: ϝοηʔδͷσίʔυ
    msg, err := message.Unmarshal(b)
    asr, ok := msg.(*messages.AssociationSetupRequest)
    // single value IE: "go-pfcp.epc.3gppnetwork.org" in string
    field := asr.NodeID // accesses to a field named NodeID in AssociationSetupRequest
    nodeID, err := field.NodeID() // retrieves value in Go-friendly type
    // flags: BUCP bit is set to 1
    if asr.UPFunctionFeatures.HasBUCP() { … }
    // complex: returns a struct named XyzFields
    fields, err := AlternativeSMFIPAddress() // AlternativeSMFIPAddressFields struct
    v4 := fields.IPv4Address // 127.0.0.1 in net.IP
    v6 := fields.IPv6Address // 2001::1 in net.IP
    AssociationSetupRequestͷϑΟʔϧυʹ
    
    ΞΫηε (͜ͷ࣌఺Ͱ͸*ie.IEܕ)
    

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37. go-pfcp: PFCP implementation in Golang
    • ࢖͍ํ2: ϝοηʔδͷσίʔυ
    msg, err := message.Unmarshal(b)
    asr, ok := msg.(*messages.AssociationSetupRequest)
    // single value IE: "go-pfcp.epc.3gppnetwork.org" in string
    field := asr.NodeID // accesses to a field named NodeID in AssociationSetupRequest
    nodeID, err := field.NodeID() // retrieves value in Go-friendly type
    // flags: BUCP bit is set to 1
    if asr.UPFunctionFeatures.HasBUCP() { … }
    // complex: returns a struct named XyzFields
    fields, err := AlternativeSMFIPAddress() // AlternativeSMFIPAddressFields struct
    v4 := fields.IPv4Address // 127.0.0.1 in net.IP
    v6 := fields.IPv6Address // 2001::1 in net.IP
    *ie.IEܕ͔Βɺཉ͍͠IEͷ஋ΛऔΓग़͢
    
    (ฦΓ஋ͷܕ͸ϝιου͝ͱʹҟͳΔ)
    ϑϥά͸ࣗಈ൑ผ
    

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38. go-pfcp: PFCP implementation in Golang
    • ࢖͍ํ2: ϝοηʔδͷσίʔυ
    msg, err := message.Unmarshal(b)
    asr, ok := msg.(*messages.AssociationSetupRequest)
    // single value IE: "go-pfcp.epc.3gppnetwork.org" in string
    field := asr.NodeID // accesses to a field named NodeID in AssociationSetupRequest
    nodeID, err := field.NodeID() // retrieves value in Go-friendly type
    // flags: BUCP bit is set to 1
    if asr.UPFunctionFeatures.HasBUCP() { … }
    // complex: returns a struct named XyzFields
    fields, err := AlternativeSMFIPAddress() // AlternativeSMFIPAddressFields struct
    v4 := fields.IPv4Address // 127.0.0.1 in net.IP
    v6 := fields.IPv6Address // 2001::1 in net.IP
    ϑϥάͷྨ͸ɺHasSomeBit()ͰऔΓग़ͤΔ
    
    

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39. go-pfcp: PFCP implementation in Golang
    • ࢖͍ํ2: ϝοηʔδͷσίʔυ
    msg, err := message.Unmarshal(b)
    asr, ok := msg.(*messages.AssociationSetupRequest)
    // single value IE: "go-pfcp.epc.3gppnetwork.org" in string
    field := asr.NodeID // accesses to a field named NodeID in AssociationSetupRequest
    nodeID, err := field.NodeID() // retrieves value in Go-friendly type
    // flags: BUCP bit is set to 1
    if asr.UPFunctionFeatures.HasBUCP() { … }
    // complex: returns a struct named XyzFields
    fields, err := AlternativeSMFIPAddress() // AlternativeSMFIPAddressFields struct
    v4 := fields.IPv4Address // 127.0.0.1 in net.IP
    v6 := fields.IPv6Address // 2001::1 in net.IP
    ෳࡶͳߏ଄(ෳ਺஋)Λ࣋ͭIEͰ͸ɺstructΛฦ͢
    
    (ͦͷதʹ֤஋͕ೖ͍ͬͯΔ)
    

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40. go-pfcp: PFCP implementation in Golang
    • ࢖͍ํ2: ϝοηʔδͷσίʔυ
    msg, err := message.Unmarshal(b)
    asr, ok := msg.(*messages.AssociationSetupRequest)
    // single value IE: "go-pfcp.epc.3gppnetwork.org" in string
    field := asr.NodeID // accesses to a field named NodeID in AssociationSetupRequest
    nodeID, err := field.NodeID() // retrieves value in Go-friendly type
    // flags: BUCP bit is set to 1
    if asr.UPFunctionFeatures.HasBUCP() { … }
    // complex: returns a struct named XyzFields
    fields, err := AlternativeSMFIPAddress() // AlternativeSMFIPAddressFields struct
    v4 := fields.IPv4Address // 127.0.0.1 in net.IP
    v6 := fields.IPv6Address // 2001::1 in net.IP
    ϑΟʔϧυ͕ົʹଟ͍IEͷྫ
    
    (ωʔϛϯά͕൒͹ϠέΫιʹͳΓ͕ͪ)
    

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41. go-pfcp: PFCP implementation in Golang
    • ࢖͍ํ3: Association / Sessionͷ؅ཧ (ԾσβΠϯ / ະ࣮૷)
    // Client
    conn, err := pfcp.Dial(…)
    assoc, err := conn.SetupAssociation(…)
    session, err := assoc.EstablishSession(…)
    // Server
    conn, err := pfcp.ListenAndServe(…)
    assoc, err := conn.GetAssociationByAAA(…)
    session, err := assoc.GetSessionByBBB(…)
    

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42. go-pfcp: PFCP implementation in Golang
    • ͭΒ͔ͬͨ͜ͱ1: ϓϩτίϧࣗମ͕݁ߏ৽͍͠
    
    • Specͷߋ৽಺༰͕͙͍͑
    
    • IE͕ͨ͘͞Μ૿͑ͨΓ͢Δ
    
    • ·ͩCR͕ੵ΋͍ͬͯΔ
    
    • WiresharkཔΈ࡞ઓ͕࢖͑ͳ͍
    
    • ࠷৽࢓༷ʹ௥͍͍͍ͭͯͳ͍(ະ࣮૷)
    
    • ͨ·ʹόά͕͋Δ(Ϣʔβ͕গͳ͍)
    https://code.wireshark.org/review/q/author:+Yoshiyuki+Kurauchi
    

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43. go-pfcp: PFCP implementation in Golang
    • ͭΒ͔ͬͨ͜ͱ2: ࢓༷ࣗମʹϫφ͕͋Δ
    
    • F-TEID v.s. F-SEID: Flagsͷॱং
    
    • ·͍͊ͭ΋ͷ͜ͱͰ͕͢
    

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44. go-pfcp: PFCP implementation in Golang
    • ࠓޙͷํ਑
    
    • Association / Session؅ཧAPIͷ׬੒
    
    • αϯϓϧΛॆ࣮ͤ͞Δ
    
    • go-gtpͱ૊Έ߹Θͤͯ؆қσϞϊʔυΛͭ͘Δ
    
    • GW TesterʹCUPSಋೖͪ͠Ό͏͔΋ʁ
    ͳΜ͔Star͕
    
    ૿͑࢝Ίͨ
    ENOGͷ
    
    CfPక੾
    ೩͑ਚ͖͍ͯΔ
    

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45. Thank you
    

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