netdev - Re: [PATCH net] udp: fix IP

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Date:   Tue, 25 Oct 2016 13:05:21 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Sam Kumar <samanthakumar@...gle.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Tom Herbert <tom@...bertland.com>
Subject: Re: [PATCH net] udp: fix IP_CHECKSUM handling

On Tue, 2016-10-25 at 15:43 -0400, Willem de Bruijn wrote:
> On Sun, Oct 23, 2016 at 9:03 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> > From: Eric Dumazet <edumazet@...gle.com>
> >
> > First bug was added in commit ad6f939ab193 ("ip: Add offset parameter to
> > ip_cmsg_recv") : Tom missed that ipv4 udp messages could be received on
> > AF_INET6 socket. ip_cmsg_recv(msg, skb) should have been replaced by
> > ip_cmsg_recv_offset(msg, skb, sizeof(struct udphdr));
> >
> > Then commit e6afc8ace6dd ("udp: remove headers from UDP packets before
> > queueing") forgot to adjust the offsets now UDP headers are pulled
> > before skb are put in receive queue.
> >
> > Fixes: ad6f939ab193 ("ip: Add offset parameter to ip_cmsg_recv")
> > Fixes: e6afc8ace6dd ("udp: remove headers from UDP packets before queueing")
> > Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> > Cc: Sam Kumar <samanthakumar@...gle.com>
> > Cc: Willem de Bruijn <willemb@...gle.com>
> > ---
> > Tom, I would appreciate your feedback on this patch, I presume
> > you have tests to verify IP_CHECKSUM feature ? Thanks !
> >
> 
> Tested-by: Willem de Bruijn <willemb@...gle.com>
> 
> Thanks for fixing, Eric.
> 
> Tested with https://github.com/wdebruij/kerneltools/blob/master/tests/recv_cmsg_ipchecksum.c

Thanks a lot Willem for cooking this test !