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- The two types must be type-punnable for shared members of ifr_ifru. This allows compatibility accessors to be shared. - There must be no padding gap between ifr_name and ifr_ifru. This is assumed in tcpdump's use of SIOCGIFFLAGS output which attempts to be broadly portable. This is true for all current architectures, but very large (256-bit) fat-pointers could violate this invariant. Reviewed by: kib Obtained from: CheriBSD Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D14910