Describe the feature you'd like supported

BPF on Linux can specify additional flags when loading a program, and the extension provider / hook can query those flags and alter its behavior.

An example from xdp-tools refers to a BPF_F_XDP_HAS_FRAGS flag that allows the XDP hook to infer whether the program is capable of handling discontiguous packets.

Proposed solution

These flags provide a mechanism for breaking changes to be introduced for a specific program type, and provide optional behavior in general, without needing to introduce a new program type or attach point.

Additional context

It's possible the following libbpf routines are related to this feature:

LIBBPF_API __u32 bpf_program__flags(const struct bpf_program *prog);
LIBBPF_API int bpf_program__set_flags(struct bpf_program *prog, __u32 flags);