[RFC PATCH 09/11] bpf: mark helpers explicitly whether they may change

Some helpers may update the context. Right now, various network filter helpers may make changes to the packet data. This is verified by calling the bpf_helper_changes_pkt_data() function with the function pointer. This function resides in net/core/filter.c and needs to be updated for any helper

[RFC PATCH 09/11] bpf: mark helpers explicitly whether they may change the context

Some helpers may update the context. Right now, various network filter helpers may make changes to the packet data. This is verified by calling the bpf_helper_changes_pkt_data() function with the function pointer. This function resides in net/core/filter.c and needs to be updated for any helper