Hydra Extern

Externs are provided to users in the form of declarations, while the actual implementation is provided by the programming framework. Users are not allowed to modify existing extern objects or extern functions. Disobeying this rule will result in a compilation failure.

Hydra provides various extern objects and extern functions in the architecture file hydra_externs.hdr for users to edit packets, calculate checksums, and implement functions such as tunnel encapsulation and decapsulation through extern interfaces. For details, see the BeiMing 26.0.RC1 FlexDA Programming Framework API Reference.