The /proc filesystem contains a number of files specifically related to the AX.25 and NET/ROM kernel software. These files are normally used by the AX52 utilities, but they are plainly formatted so you may be interested in reading them. The format is fairly easily understood so I don't think much explanation will be necessary.
contains the list of Address Resolution Protocol mappings of IP addresses to MAC layer protocol addresses. These can can AX.25, ethernet or some other MAC layer protocol.
contains a list of AX.25 sockets opened. These might be listening for a connection, or active sessions.
contains the AX.25 over ethernet BPQ style callsign mappings.
contains the linux userid to callsign mappings set my the axparms -assoc command.
contains AX.25 digipeater path information.
contains a list of NET/ROM sockets opened. These might be listening for a connection, or active sessions.
contains information about the NET/ROM neighbours known to the NET/ROM software.
contains information about the NET/ROM nodes known to the NET/ROM software.
contains a list of ROSE sockets opened. These might be listening for a connection, or active sessions.
contains a mapping of ROSE destinations to ROSE neighbours.
contains a list of known ROSE neighbours.
contains a list of all established ROSE connections.