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Date: Fri, 01 Feb 2008 17:42:23 -0800
From: Rick Jones <rick.jones2@...com>
To: Linux Network Development list <netdev@...r.kernel.org>
Subject: why does DCCP SO_REUSEADDR have to be SOL_DCCP?
Hi -
I'm tweaking the netperf omni tests to be able to run over DCCP. I've
run across a not-unorecedented problem with getaddrinfo() not groking
either SOCK_DCCP or IPPROTO_DCCP in the hints, and that I can more or
less live with - I had to do a kludge for getaddrinfo() for IPPROTO_SCTP
under Linux at one point and I can see how the two are not necessarily
going to be in sync.
And I've worked-around no user-level include files (ie without setting
__KERNEL__) define the DCCP stuff, and that is OK too, albeit somewhat
inconvenient.
My question though is why on earth does an SO_REUSEADDR setsockopt()
against a DCCP socket have to be SOL_DCCP? SCTP and TCP are quite happy
with SOL_SOCKET, and it might be foolish consistency, but since the
option _does_ begin with SO_ I'd have expected it to work for
SOL_SOCKET, but (again RHEL5.1, yes, I do plan on getting upstream but
have to satisfy several masters) it doesn't seem to be the case - a
subsequent listen() or connect() call after an SOL_SOCKET SO_REUSEADDR
against a DCCP socket leaves one SOL as it were...
Of course the setsockopt(SO_REUSEADDR) against the DCCP socket using
SOL_SOCKET itself doesn't fail, only the later listen() or connect() call...
happy benchmarking,
rick jones
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