Currently, I need to edit lua file for the mapping of dissector.
For nr-nrrc, I tried to find from the source code in github:
Github
Then I find the dissector in the comment.
My question is that:
1. Is there any dissector mapping list somewhere instead of trying to find mapping in source code?
2. What's the dissector for decoding RadioBearerConfig in nr-nrrc currently?
The reference site for the Wireshark source code is currently here.
The nr-rrc dissector is an "asn1" dissector where the main protocol definition is in one or more .asn files which are combined with the .cnf and packet-xxx-template.[c|h] files to produce a C dissector, in this case packet-nr-rrc.c.
If you search that file you will find lots of references to RadioBearerConfig which may help you find what you're looking for.
And to complete @grahamb answer, there is no registered dissector for the RadioBearerConfig IE: instead where needed in our C code we call a direct function dissect_nr_rrc_RadioBearerConfig_PDU as seen in packet-nr-rrc.h.
If you are trying to decode a EN-DC LTE RRC Connection Reconfiguration, better call the LTE RRC DL DCCH dissector directly: it will call the RadioBearerConfig IE decoding function whenever needed. Same thing for a NR RRC Reconfiguration message.
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