netdev - a vxlan question.

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Message-ID: <CACP96tSOA70sAE_b-Ff6=gOySg0sHQQMRwpuNaA1n5HvgFAzSA@mail.gmail.com>
Date:	Sun, 12 Jan 2014 12:25:51 -0500
From:	sowmini varadhan <sowmini05@...il.com>
To:	netdev@...r.kernel.org
Cc:	sowmini.varadhan@...com
Subject: a vxlan question.

A question about the vxlan implementation in linux:

if the inner packet (the frame that is vxlan encapsulated) is an IP
packet that has the DF bit set, i.e., it is a PMTU discovery packet, and
the subsequent vxlan encapsulation results in a ICMP packet-too-big
error,then does the VTEP relay that error back to the originator of
the
PMTU packet?

AFAICT, the current linux code in drivers/net/vxlan.c
does not address any icmp errors (though it sets the DF of the outer
header based on the inner header). From my reading of the code,
we'd end up in __udp4_lib_err for the vxlan-encaps packet, but
there's nothing in there that recognizes that the udp payload is
itself an ethernet+IP frame and relays pmtu back to the (inner) ip src?
Did I miss something?

--Sowmini
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