Wireshark mailing list archives
NBAP -> RRC Help
From: Rick Bywater <rbywater () tecore com>
Date: Tue, 10 Nov 2009 09:20:42 -0500
All, I am looking at the NBAP dissector to correct/complete its decode of IB_SG_DATA. According to the specifications, the IB_SG_DATA has RRC encoding. So, for each IE IB_SG_DATA IE, the RRC dissector for that segment (presumably) should be called. Currently, those IEs simply decode as bit string? Here is an abbreviated section of the decode I am talking about: Frame 1 (330 bytes on wire, 330 bytes captured) Ethernet II, Src: Dell_ed:a0:a4 (00:11:43:ed:a0:a4), Dst: DellComp_f2:3c:f1 (00:b0:d0:f2:3c:f1) Internet Protocol, Src: 172.16.5.201 (172.16.5.201), Dst: 10.30.86.200 (10.30.86.200) Stream Control Transmission Protocol, Src Port: 49153 (49153), Dst Port: 49152 (49152) UTRAN Iub interface NBAP signalling NBAP-PDU: initiatingMessage (0) initiatingMessage procedureID procedureCode: id-systemInformationUpdate (32) ddMode: common (2) criticality: reject (0) messageDiscriminator: common (0) transactionID: longTransActionId (1) longTransActionId: 80 value SystemInformationUpdateRequest protocolIEs: 2 items Item 0: id-C-ID ProtocolIE-Field id: id-C-ID (25) criticality: reject (0) value C-ID: 0 Item 1: id-MIB-SB-SIB-InformationList-SystemInfoUpdateRqst ProtocolIE-Field id: id-MIB-SB-SIB-InformationList-SystemInfoUpdateRqst (134) criticality: reject (0) value MIB-SB-SIB-InformationList-SystemInfoUpdateRqst: 7 items Item 0 MIB-SB-SIB-InformationItem-SystemInfoUpdateRqst iB-Type: mIB (0) iB-OC-ID: 1 deletionIndicator: no-Deletion (0) no-Deletion: id-SegmentInformationListIE-SystemInfoUpdate iB-SG-REP: rep8 (1) segmentInformationList id: id-SegmentInformationListIE-SystemInfoUpdate (266) criticality: reject (0) value SegmentInformationListIE-SystemInfoUpdate: 1 item Item 0 SegmentInformationItem-SystemInfoUpdate iB-SG-POS: 0 segment-Type: complete-SIB (5) iB-SG-DATA: 609104650004062120321101990C8D4400D01CA880E8 [bit length 176] So, my question is how is that done? Can a higher level dissector be invoked via an ASN.1 dissector while returning back later to finish decoding the remaining IEs? If so, where is an example I can follow? Thanks, Rick
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Current thread:
- NBAP -> RRC Help Rick Bywater (Nov 10)
- Re: NBAP -> RRC Help Anders Broman (Nov 10)