netdev - Re: [PATCH bpf-next v3] bpf: bpf_{g,s}etsockopt for struct bpf_sock

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Date:   Thu, 30 Apr 2020 22:54:35 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     Stanislav Fomichev <sdf@...gle.com>
CC:     <netdev@...r.kernel.org>, <bpf@...r.kernel.org>,
        <davem@...emloft.net>, <ast@...nel.org>, <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>
Subject: Re: [PATCH bpf-next v3] bpf: bpf_{g,s}etsockopt for struct
 bpf_sock_addr

On Thu, Apr 30, 2020 at 04:31:52PM -0700, Stanislav Fomichev wrote:
> Currently, bpf_getsockopt and bpf_setsockopt helpers operate on the
> 'struct bpf_sock_ops' context in BPF_PROG_TYPE_SOCK_OPS program.
> Let's generalize them and make them available for 'struct bpf_sock_addr'.
> That way, in the future, we can allow those helpers in more places.
> 
> As an example, let's expose those 'struct bpf_sock_addr' based helpers to
> BPF_CGROUP_INET{4,6}_CONNECT hooks. That way we can override CC before the
> connection is made.
> 
> v3:
> * Expose custom helpers for bpf_sock_addr context instead of doing
>   generic bpf_sock argument (as suggested by Daniel). Even with
>   try_socket_lock that doesn't sleep we have a problem where context sk
>   is already locked and socket lock is non-nestable.
Acked-by: Martin KaFai Lau <kafai@...com>