struct inpcb (sys/netinet/in_pcb.h) lays out inp_faddr, inp_fport, inp_laddr,
inp_lport at 12/16/18/22 with 16-bit alignment -- exactly the ROM offsets
0x60/0x80/0x90/0xB0, in the same order in_pcblookup tests them. A 32-bit
aligned build would put them at 12/16/20/24, so the match also pins the
firmware ABI to 16-bit alignment, consistent with struct protosw's 6/10.
arti
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