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Date:   Wed, 27 Jan 2021 22:30:34 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Stanislav Fomichev <sdf@...gle.com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Cc:     ast@...nel.org
Subject: Re: [PATCH bpf-next] bpf: enable bpf_{g,s}etsockopt in
 BPF_CGROUP_UDP{4,6}_SENDMSG

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?

Thanks,
Daniel