AA_MASK
(h->flags & AA_MASK) ? "AA":" ",
(h->flags & AA_MASK) ? "AA":" ",
(h->flags & AA_MASK) ? "AA":" ",
#define AA(packet) (*buffer_at((packet), 2) & AA_MASK)
#define AA_SET(packet) (*buffer_at((packet), 2) |= AA_MASK)
#define AA_CLR(packet) (*buffer_at((packet), 2) &= ~AA_MASK)