netdev - Re: [PATCH bpf-next v2 4/4] bpf: enable bpf_{g,s}etsockopt in BPF_CGROUP_UDP{4,6}

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Date:   Thu, 28 Jan 2021 16:59:25 -0800
From:   Stanislav Fomichev <sdf@...gle.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     Netdev <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>
Subject: Re: [PATCH bpf-next v2 4/4] bpf: enable bpf_{g,s}etsockopt in BPF_CGROUP_UDP{4,6}_RECVMSG

On Thu, Jan 28, 2021 at 4:52 PM Daniel Borkmann <daniel@...earbox.net> wrote:
>
> On 1/28/21 12:28 AM, Stanislav Fomichev wrote:
> > Those hooks run as BPF_CGROUP_RUN_SA_PROG_LOCK and operate on
> > a locked socket.
> >
> > Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
> > ---
> >   net/core/filter.c                                 | 4 ++++
> >   tools/testing/selftests/bpf/progs/recvmsg4_prog.c | 5 +++++
> >   tools/testing/selftests/bpf/progs/recvmsg6_prog.c | 5 +++++
> >   3 files changed, 14 insertions(+)
> >
> > diff --git a/net/core/filter.c b/net/core/filter.c
> > index ba436b1d70c2..e15d4741719a 100644
> > --- a/net/core/filter.c
> > +++ b/net/core/filter.c
> > @@ -7023,6 +7023,8 @@ sock_addr_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
> >               case BPF_CGROUP_INET6_BIND:
> >               case BPF_CGROUP_INET4_CONNECT:
> >               case BPF_CGROUP_INET6_CONNECT:
> > +             case BPF_CGROUP_UDP4_RECVMSG:
> > +             case BPF_CGROUP_UDP6_RECVMSG:
> >               case BPF_CGROUP_UDP4_SENDMSG:
> >               case BPF_CGROUP_UDP6_SENDMSG:
> >               case BPF_CGROUP_INET4_GETPEERNAME:
> > @@ -7039,6 +7041,8 @@ sock_addr_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
> >               case BPF_CGROUP_INET6_BIND:
> >               case BPF_CGROUP_INET4_CONNECT:
> >               case BPF_CGROUP_INET6_CONNECT:
> > +             case BPF_CGROUP_UDP4_RECVMSG:
> > +             case BPF_CGROUP_UDP6_RECVMSG:
> >               case BPF_CGROUP_UDP4_SENDMSG:
> >               case BPF_CGROUP_UDP6_SENDMSG:
> >               case BPF_CGROUP_INET4_GETPEERNAME:
>
> Looks good overall, also thanks for adding the test cases! I was about to apply, but noticed one
> small nit that would be good to get resolved before that. Above you now list all the attach hooks
> for sock_addr ctx, so we should just remove the whole switch that tests on prog->expected_attach_type
> altogether in this last commit.
Sure, I can resend tomorrow.
But do you think it's safe and there won't ever be another sock_addr
hook that runs with an unlocked socket?