netdev - Re: [PATCH bpf v2 0/5] bpf: Allow any source IP in bpf_skb_set_tunnel

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Message-ID: <CAADnVQLV-Tkyo+jJtLB6MYr7kR8k4Q9_T0La7MPEUXzcRE7EZg@mail.gmail.com>
Date:   Tue, 19 Jul 2022 10:44:52 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Nikolay Aleksandrov <razor@...ckwall.org>
Cc:     Paul Chaignon <paul@...valent.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Network Development <netdev@...r.kernel.org>,
        bpf <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 Mon, Jul 18, 2022 at 11:58 PM Nikolay Aleksandrov
<razor@...ckwall.org> wrote:
>
> 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>

vxlan_test is failing.
See BPF CI link in patchwork.

Also it's too late for 'bpf' tree. Pls tag bpf-next on respin.