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Date:   Tue, 19 Jul 2022 09:58:04 +0300
From:   Nikolay Aleksandrov <razor@...ckwall.org>
To:     Paul Chaignon <paul@...valent.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        John Fastabend <john.fastabend@...il.com>,
        Kaixi Fan <fankaixi.li@...edance.com>,
        Yonghong Song <yhs@...com>
Subject: Re: [PATCH bpf v2 0/5] bpf: Allow any source IP in
 bpf_skb_set_tunnel_key

On 18/07/2022 18:53, Paul Chaignon wrote:
> Commit 26101f5ab6bd ("bpf: Add source ip in "struct bpf_tunnel_key"")
> added support for getting and setting the outer source IP of encapsulated
> packets via the bpf_skb_{get,set}_tunnel_key BPF helper. This change
> allows BPF programs to set any IP address as the source, including for
> example the IP address of a container running on the same host.
> 
> In that last case, however, the encapsulated packets are dropped when
> looking up the route because the source IP address isn't assigned to any
> interface on the host. To avoid this, we need to set the
> FLOWI_FLAG_ANYSRC flag.
> 
> Changes in v2:
>   - Removed changes to IPv6 code paths as they are unnecessary.
> 
> Paul Chaignon (5):
>   ip_tunnels: Add new flow flags field to ip_tunnel_key
>   vxlan: Use ip_tunnel_key flow flags in route lookups
>   geneve: Use ip_tunnel_key flow flags in route lookups
>   bpf: Set flow flag to allow any source IP in bpf_tunnel_key
>   selftests/bpf: Don't assign outer source IP to host
> 
>  drivers/net/geneve.c                                 |  1 +
>  drivers/net/vxlan/vxlan_core.c                       | 11 +++++++----
>  include/net/ip_tunnels.h                             |  1 +
>  net/core/filter.c                                    |  1 +
>  tools/testing/selftests/bpf/prog_tests/test_tunnel.c |  1 -
>  5 files changed, 10 insertions(+), 5 deletions(-)
> 

Looks good, for the set:
Reviewed-by: Nikolay Aleksandrov <razor@...ckwall.org>

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