Re: Feature request noticed in bugzilla

> Seems that there is no standard way for it. If I recall it right, then
> somewhere during digging into that matter with solaris I stepped across
> clear statement, that any options in TCP header can be accessed only via
> raw socket snooping. Probably its a matter of library interface, but we
> don't have it yet.
> I think MSG_PEEK wouldn't give it either, as it gives only data, not
> any upper level options... I may be wrong.

It looks like it should be possible but I couldn't get some test code to
work and it's not clear from the kernel source that IP_RECVTOS works on
TCP (I would've thought that it could easily be stored for a TCP session
and retrieved by a simple query). I'll try and look again later.

David.

> On 6 Mar 2001, at 13:43, David Luyer <david_luyer@pacific.net.au> wrote:
>
> > We have someone requesting to be able to select delay pools via TOS bits.
> > What that really means is they need an ACL which can select based on TOS
> > bits.
> >
> > However I can't think how we would query the TOS bits on an incoming
> > socket; there must be a way... (and something better than watching the
> > incoming SYN's via a packet filter socket or receiving raw packets via
> > a raw socket at that :-). There's no match for "type of service" in the
> > libc info files on Linux or relevant man pages. I'd expect being able
> > to recvmsg with MSG_PEEK on the listening socket instead before doing
> > an accept() or something like that.

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