netdev - No cmsg for SOCK

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Date:	Sat, 14 Jul 2007 11:53:20 +0200
From:	Daniel Schaffrath <daniel.schaffrath@....com>
To:	linux-net@...r.kernel.org, Linux NetDev <netdev@...r.kernel.org>
Subject: No cmsg for SOCK_STREAM?

Hello everybody,

'man 7 ip' sais that IP_RECVOPTS is not supported for SOCK_STREAM  
sockets.

But what if for debugging/measuring purposes I wanted to record the  
route of the datagrams containing the stream segments? Are there any  
other ways to get the IP options? Like a second raw socket to deliver  
cmsgs to user space and later resubmit for kernel TCP processing and  
normal delivery to application -- if that is possible at all.

Or any other way?

Thanks in advance,
Daniel

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