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srsran / srsRAN_4G

Open source SDR 4G software suite from Software Radio Systems (SRS) https://docs.srsran.com/projects/4g
https://www.srsran.com
GNU Affero General Public License v3.0
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srsepc - TEID or UE IP pool incorrect rotation management #585

Closed ECTPavloR closed 1 year ago

ECTPavloR commented 4 years ago

Issue Description

Hello! Using a few UEs under kind of load test with connecting/disconnect behavior for ~2h. At some point srsepc eating up an IP pool and continue allocating 0.0.0.0 addresses, while in fact only 25 UEs on the air.

Setup Details

srslte 20.04 25UEs (based on Quectel modems) BladeRF frontend

default epc config (just PLMN adjusted to my SIM cards) [mme] mme_code = 0x1a mme_group = 0x0001 tac = 0x0007 mcc = 255 mnc = 17 mme_bind_addr = 127.0.1.100

[spgw] gtpu_bind_addr = 127.0.1.100 sgi_if_addr = 172.16.0.1 sgi_if_name = srs_spgw_sgi max_paging_queue = 100

Expected Behavior

cleaning IP pool from unused contexts and IP addresses re-allocation from declared /24 pool.

Actual Behaviour

... Creating Session Response -- MME control TEID: 253 Received GTP-C PDU. Message type: GTPC_MSG_TYPE_CREATE_SESSION_REQUEST SPGW: Allocated Ctrl TEID 253 SPGW: Allocated User TEID 253 SPGW: Allocate UE IP 172.16.0.254 ... Creating Session Response -- MME control TEID: 254 Received GTP-C PDU. Message type: GTPC_MSG_TYPE_CREATE_SESSION_REQUEST SPGW: Allocated Ctrl TEID 254 SPGW: Allocated User TEID 254 SPGW: Allocate UE IP 0.0.0.0 ... Creating Session Response -- MME control TEID: 255 Received GTP-C PDU. Message type: GTPC_MSG_TYPE_CREATE_SESSION_REQUEST SPGW: Allocated Ctrl TEID 255 SPGW: Allocated User TEID 255 SPGW: Allocate UE IP 0.0.0.0 ...

Steps to reproduce the problem

Running few UEs with connect/disconnect behavior for a long time. In our case 25-26 UEs for ~2h to use the whole TEID and/or UE IP pool reaching TEID value >253. Could be used less # of UEs but for a longer time to consume the pool

Additional Information

entire log is below. It looks good for all the other connections before TEID 253 Initial UE message: LIBLTE_MME_MSG_TYPE_ATTACH_REQUEST Received Initial UE message -- Attach Request Attach request -- M-TMSI: 0x4cdc6ad5 Attach request -- eNB-UE S1AP Id: 120 Attach request -- Attach type: 2 Attach Request -- UE Network Capabilities EEA: 11110000 Attach Request -- UE Network Capabilities EIA: 01110000 Attach Request -- MS Network Capabilities Present: true PDN Connectivity Request -- EPS Bearer Identity requested: 0 PDN Connectivity Request -- Procedure Transaction Id: 1 PDN Connectivity Request -- ESM Information Transfer requested: true UL NAS: Received Identity Response ID Response -- IMSI: 255172020080003 Downlink NAS: Sent Authentication Request UL NAS: Received Authentication Response Authentication Response -- IMSI 255172020080003 UE Authentication Accepted. Generating KeNB with UL NAS COUNT: 0 Downlink NAS: Sending NAS Security Mode Command. UL NAS: Received Security Mode Complete Security Mode Command Complete -- IMSI: 255172020080003 Sending ESM information request UL NAS: Received ESM Information Response ESM Info: APN internet Getting subscription information -- QCI 7 Sending Create Session Request. Creating Session Response -- IMSI: 255172020080003 Creating Session Response -- MME control TEID: 253 Received GTP-C PDU. Message type: GTPC_MSG_TYPE_CREATE_SESSION_REQUEST SPGW: Allocated Ctrl TEID 253 SPGW: Allocated User TEID 253 SPGW: Allocate UE IP 172.16.0.254 Received Create Session Response Create Session Response -- SPGW control TEID 253 Create Session Response -- SPGW S1-U Address: 127.0.1.100 SPGW Allocated IP 172.16.0.254 to IMSI 255172020080003 Adding attach accept to Initial Context Setup Request Sent Initial Context Setup Request. E-RAB id 5 Received Initial Context Setup Response E-RAB Context Setup. E-RAB id 5 E-RAB Context -- eNB TEID 0x3960003; eNB GTP-U Address 127.0.1.1 UL NAS: Received Attach Complete Unpacked Attached Complete Message. IMSI 255172020080003 Unpacked Activate Default EPS Bearer message. EPS Bearer id 5 Received GTP-C PDU. Message type: GTPC_MSG_TYPE_MODIFY_BEARER_REQUEST Sending EMM Information Initial UE message: LIBLTE_MME_MSG_TYPE_ATTACH_REQUEST Received Initial UE message -- Attach Request Attach request -- M-TMSI: 0x4cdc6adc Attach request -- eNB-UE S1AP Id: 121 Attach request -- Attach type: 2 Attach Request -- UE Network Capabilities EEA: 11110000 Attach Request -- UE Network Capabilities EIA: 01110000 Attach Request -- MS Network Capabilities Present: true PDN Connectivity Request -- EPS Bearer Identity requested: 0 PDN Connectivity Request -- Procedure Transaction Id: 1 PDN Connectivity Request -- ESM Information Transfer requested: true UL NAS: Received Identity Response ID Response -- IMSI: 255172020080002 Downlink NAS: Sent Authentication Request UL NAS: Received Authentication Response Authentication Response -- IMSI 255172020080002 UE Authentication Accepted. Generating KeNB with UL NAS COUNT: 0 Downlink NAS: Sending NAS Security Mode Command. UL NAS: Received Security Mode Complete Security Mode Command Complete -- IMSI: 255172020080002 Sending ESM information request UL NAS: Received ESM Information Response ESM Info: APN internet Getting subscription information -- QCI 7 Sending Create Session Request. Creating Session Response -- IMSI: 255172020080002 Creating Session Response -- MME control TEID: 254 Received GTP-C PDU. Message type: GTPC_MSG_TYPE_CREATE_SESSION_REQUEST SPGW: Allocated Ctrl TEID 254 SPGW: Allocated User TEID 254 SPGW: Allocate UE IP 0.0.0.0 Received Create Session Response Create Session Response -- SPGW control TEID 254 Create Session Response -- SPGW S1-U Address: 127.0.1.100 SPGW Allocated IP 0.0.0.0 to IMSI 255172020080002 Adding attach accept to Initial Context Setup Request Sent Initial Context Setup Request. E-RAB id 5 Received Initial Context Setup Response E-RAB Context Setup. E-RAB id 5 E-RAB Context -- eNB TEID 0x3970003; eNB GTP-U Address 127.0.1.1 UL NAS: Detach Request Detach request -- IMSI 255172020080002 Received GTP-C PDU. Message type: GTPC_MSG_TYPE_DELETE_SESSION_REQUEST Received UE Context Release Complete. MME-UE S1AP Id 467 UE is not ECM connected. No need to release S1-U. MME UE S1AP Id 467 UE Context Release Completed. Received UE Context Release Request. MME-UE S1AP Id 453 There are active E-RABs, send release access bearers request Received GTP-C PDU. Message type: GTPC_MSG_TYPE_RELEASE_ACCESS_BEARERS_REQUEST Received UE Context Release Complete. MME-UE S1AP Id 453 There are active E-RABs, send release access bearers request UE Context Release Completed. Received GTP-C PDU. Message type: GTPC_MSG_TYPE_RELEASE_ACCESS_BEARERS_REQUEST Initial UE message: LIBLTE_MME_MSG_TYPE_ATTACH_REQUEST Received Initial UE message -- Attach Request Attach request -- M-TMSI: 0x4cdc6ada Attach request -- eNB-UE S1AP Id: 122 Attach request -- Attach type: 2 Attach Request -- UE Network Capabilities EEA: 11110000 Attach Request -- UE Network Capabilities EIA: 01110000 Attach Request -- MS Network Capabilities Present: true PDN Connectivity Request -- EPS Bearer Identity requested: 0 PDN Connectivity Request -- Procedure Transaction Id: 1 PDN Connectivity Request -- ESM Information Transfer requested: true UL NAS: Received Identity Response ID Response -- IMSI: 255172020080021 Downlink NAS: Sent Authentication Request UL NAS: Received Authentication Response Authentication Response -- IMSI 255172020080021 UE Authentication Accepted. Generating KeNB with UL NAS COUNT: 0 Downlink NAS: Sending NAS Security Mode Command. UL NAS: Received Security Mode Complete Security Mode Command Complete -- IMSI: 255172020080021 Sending ESM information request UL NAS: Received ESM Information Response ESM Info: APN internet Getting subscription information -- QCI 7 Sending Create Session Request. Creating Session Response -- IMSI: 255172020080021 Creating Session Response -- MME control TEID: 255 Received GTP-C PDU. Message type: GTPC_MSG_TYPE_CREATE_SESSION_REQUEST SPGW: Allocated Ctrl TEID 255 SPGW: Allocated User TEID 255 SPGW: Allocate UE IP 0.0.0.0 Received Create Session Response Create Session Response -- SPGW control TEID 255 Create Session Response -- SPGW S1-U Address: 127.0.1.100 SPGW Allocated IP 0.0.0.0 to IMSI 255172020080021 Adding attach accept to Initial Context Setup Request Sent Initial Context Setup Request. E-RAB id 5 Received Initial Context Setup Response E-RAB Context Setup. E-RAB id 5 E-RAB Context -- eNB TEID 0x3980003; eNB GTP-U Address 127.0.1.1 UL NAS: Detach Request

ECTPavloR commented 4 years ago

P.S. Workaround: set static IPs in user_db.csv

andrepuschmann commented 4 years ago

Thanks for reporting this, we'll look into it. Meanwhile, your approach to set static IPs circumvents the issue, as you've already noticed.