For the local eth_src and eth_dst, instead of having the various is
set booleans, wouldn't it be simpler to just copy the default value
into the struct bfd in bfd_configure() instead of doing it in
bfd_put_packet()?
I'm not sure we should have the rmt_eth_src flag. We should probably
accept bfd p
This commit adds four options for configuring the MAC addresses
in BFD state machine. Therein, the "bfd_local_src_mac" and
"bfd_local_dst_mac" configure the MAC address of sent BFD
packets. The "bfd_remote_src_mac" and "bfd_remote_dst_mac"
configure the matching of MAC address on recevied BFD pac
