On Mon, 2012-05-14 at 20:24 +0200, Juliusz Chroboczek wrote:
> > There is an API to set ECN on UDP packets.
> >
> > setsockopt() IP_TOS, with val = 2
>
> Interesting, I didn't realise that. Is it also possible to read the ECN
> bits?
Yep
man 7 ip
IP_RECVTOS (since Linux 2.2)
If enabled the IP_TOS ancillary message is passed with incoming packets.
It contains a byte which specifies the Type of Service/Precedence field
of the packet header. Expects a boolean integer flag.
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