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

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Date:   Wed, 27 Jan 2021 13:32:47 -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] bpf: enable bpf_{g,s}etsockopt in BPF_CGROUP_UDP{4,6}_SENDMSG

On Wed, Jan 27, 2021 at 1:30 PM Daniel Borkmann <daniel@...earbox.net> wrote:
>
> On 1/27/21 6:47 PM, Stanislav Fomichev wrote:
> > Can be used to query/modify socket state for unconnected UDP sendmsg.
> > 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/sendmsg4_prog.c | 7 +++++++
> >   tools/testing/selftests/bpf/progs/sendmsg6_prog.c | 7 +++++++
> >   3 files changed, 18 insertions(+)
> >
> > diff --git a/net/core/filter.c b/net/core/filter.c
> > index 9ab94e90d660..3d7f78a19565 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_SENDMSG:
> > +             case BPF_CGROUP_UDP6_SENDMSG:
> >                       return &bpf_sock_addr_setsockopt_proto;
> >               default:
> >                       return NULL;
> > @@ -7033,6 +7035,8 @@ 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_SENDMSG:
> > +             case BPF_CGROUP_UDP6_SENDMSG:
> >                       return &bpf_sock_addr_getsockopt_proto;
>
> Patch looks good, could we at this point also add all the others that run under
> BPF_CGROUP_RUN_SA_PROG_LOCK while at it, that is v4/v6 flavors of recvmsg as well
> as peername/sockname?
Sounds good, will resend with more hooks added.