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Date: Tue, 3 Nov 2020 15:39:50 -0700 From: David Ahern <dsahern@...il.com> To: Andrea Mayer <andrea.mayer@...roma2.it>, "David S. Miller" <davem@...emloft.net>, David Ahern <dsahern@...nel.org>, Alexey Kuznetsov <kuznet@....inr.ac.ru>, Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>, Jakub Kicinski <kuba@...nel.org>, Shuah Khan <shuah@...nel.org>, Shrijeet Mukherjee <shrijeet@...il.com>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>, Martin KaFai Lau <kafai@...com>, Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>, John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...omium.org>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org Cc: Stefano Salsano <stefano.salsano@...roma2.it>, Paolo Lungaroni <paolo.lungaroni@...t.it>, Ahmed Abdelsalam <ahabdels.dev@...il.com> Subject: Re: [net-next,v1,1/5] vrf: add mac header for tunneled packets when sniffer is attached On 11/3/20 5:52 AM, Andrea Mayer wrote: > Before this patch, a sniffer attached to a VRF used as the receiving > interface of L3 tunneled packets detects them as malformed packets and > it complains about that (i.e.: tcpdump shows bogus packets). > > The reason is that a tunneled L3 packet does not carry any L2 > information and when the VRF is set as the receiving interface of a > decapsulated L3 packet, no mac header is currently set or valid. > Therefore, the purpose of this patch consists of adding a MAC header to > any packet which is directly received on the VRF interface ONLY IF: > > i) a sniffer is attached on the VRF and ii) the mac header is not set. > > In this case, the mac address of the VRF is copied in both the > destination and the source address of the ethernet header. The protocol > type is set either to IPv4 or IPv6, depending on which L3 packet is > received. > > Signed-off-by: Andrea Mayer <andrea.mayer@...roma2.it> > --- > drivers/net/vrf.c | 78 +++++++++++++++++++++++++++++++++++++++++++---- > 1 file changed, 72 insertions(+), 6 deletions(-) > Reviewed-by: David Ahern <dsahern@...nel.org>
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