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Re: UDP Lite Support on NetBSD 6.0
On Tue, Jan 15, 2013 at 12:11 AM, Matt Thomas wrote:
> On Jan 14, 2013, at 5:45 AM, Greg Troxel wrote:
>> dave jones <s.dave.jones%gmail.com@localhost> writes:
>>> I'd work on it and learn NetBSD network internals, but it seems
>>> like there is a lot of duplicated code in order to implement UDP-Lite.
>>> For example, in udp_output(), to fill in mbuf with extended UDP-Lite header,
>>> I'd add the following code:
>>> #ifdef UDPLITE
>>> ui->ui_pr = IPPROTO_UDPLITE;
>>> ui->ui_pr = IPPROTO_UDP;
>>> Is it a good idea? or any some suggestions? Thank you.
>> Adding support for UDP-Lite should not involve removing support for
> Indeed. I have untested diffs for UDP-lite
> (http://www.netbsd.org/~matt/udplite-diffs.txt) but realized that without
> corresponding changes to all the network drivers, what's the point?
> For UDPlite to be useful, the network drivers would need to stop discarding
> packets with CRC errors and instead pass them up the stack. We'd need a
> M_BADCRC flag to tag packets with bad CRCs. We also need code to identify
> packets as UDPlite. Then each common if_xxxsubr needs to test that flag and
> if set check for udplite, and if not discard.
> I thought about it and realized the additional overhead and complexity just
> wasn't worth it so I stopped working on it.
Awesome! I tried to compile kernel with your diff. I got an error
while running a testing program:
udpliteclient: setsockopt(UDPLITE_SEND_CSCOV): Protocol option not available
Should I need to recompile libc as well or did I miss something? Thank you.
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