In section EXAMPLES of bpf(4), first example on Reverse ARP,
the macro REVARP_REQUEST does not exist. The code snippet
must be updated to use ARPOP_REVREQUEST instead. For verification
look in "/usr/include/net/if_arp.h".
Use macro ARPOP_REVREQUEST.
The bpf(4) documentation states that the example is taken from the Reverse
ARP Daemon. rarpd is tightly coupled with BPF. This macro is actually
used there mapped to ARPOP_REVREQUEST. From rarpd code snippet's p.o.v.
this EXAMPLES is correct, but is not compilable as is without adding this
The REVARP_REQUEST localism is probably came from SunOS? (and RFC1931).
This macro does not exist in net/if_arp.h (in any BSD except Solaris) and
is/was probably used for source compatibility with SunOS.
The ARPOP_REVREQUEST macro sits there since 1992 (4.4BSD). SunOS took
if_arp.h from UCB on 1/24/86 and added REVARP_REQUEST on its own. It seems
to not have ARPOP_REVREQUEST.
wpaul modified rarpd.c in r19859 to use REVARP_REQUEST (it was
ARPOP_REVREQUEST there originally r6823). The bpf(4) man page came in with
r5882 from 1.1.5, and it was REVARP_REQUEST there. It was REVARP_REQUEST
in rarpd as found in 4.3BSD-UWisc copyrighted by Sun Micro dated 86/02/05
which is before 1992.
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