sys/pfkeyv2.h: define extensions for ipsec inline accel control

[kib]

Summary

The extensions allow to restrict interface where SP or SA are offloaded,
and to receive software and hardware offload counters for given SA.

[glebius]

sys/net/pfkeyv2.h

305

Better use standard uintXX types here. It is a new structure, thus it is not a mix of old and new style. If we treat presence of new and old styles within a single file as a mix, we would never migrate from old style to the new standard.

[kib]

sys/net/pfkeyv2.h

305

Converting the file to ANSI C types is a separate activity. It should be done in one pass.

I can do it but prefer to postpone after the ipsec_accel changes are landed.

[glebius]

sys/net/pfkeyv2.h

305

If this is the plan, then great! :)

[kib]

sys/net/pfkeyv2.h

305

Remind me if I forget, please.