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The code you show adds the can.id table to the socket-can dissector, but you also need to add code in the appropriate spot to actually call the sub-dissectors based on the can id.

For an example, look at packet-tcp.c where it calls sub-dissectors based on the tcp port, around line 5756:

dissector_try_uint_new(subdissector_table, tcpd->server_port, next_tvb, pinfo, tree, TRUE, tcpinfo)

This uses the port, tcpd->server-port, as the index into the subdissector_table.

See Sect. 1.7.1 in README.dissector for more info.