Let me find out what calls _gtpv1_tun_recv_cb and
_gtpv1_tun_recv_eth_cb, and also look for the system receive
entry points like epoll, select, recv, read, etc.
</think>
⚙ codegraph_codegraph_callers [symbol=_gtpv1_tun_recv_cb]
The codegraph doesn't have information about who calls these
callbacks - they are likely registered as function pointers. Let
me search for where these callbacks are registered or set up.
</think>
It seems that codegraph cannot find the C function point callers ...
⚙ codegraph_codegraph_callers [symbol=_gtpv1_u_recv_cb]