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Date:   Thu, 7 May 2020 13:26:50 -0700
From:   Andrey Ignatov <>
To:     Stanislav Fomichev <>
CC:     <>, <>,
        <>, <>, <>,
        Martin KaFai Lau <>
Subject: Re: [PATCH bpf-next v4 4/4] bpf: allow any port in bpf_bind helper

Stanislav Fomichev <> [Thu, 2020-05-07 12:12 -0700]:
> We want to have a tighter control on what ports we bind to in
> the BPF_CGROUP_INET{4,6}_CONNECT hooks even if it means
> connect() becomes slightly more expensive. The expensive part
> comes from the fact that we now need to call inet_csk_get_port()
> that verifies that the port is not used and allocates an entry
> in the hash table for it.
> Since we can't rely on "snum || !bind_address_no_port" to prevent
> us from calling POST_BIND hook anymore, let's add another bind flag
> to indicate that the call site is BPF program.
> v3:
> * More bpf_bind documentation refinements (Martin KaFai Lau)
> * Add UDP tests as well (Martin KaFai Lau)
> * Don't start the thread, just do socket+bind+listen (Martin KaFai Lau)
> v2:
> * Update documentation (Andrey Ignatov)
> * Pass BIND_FORCE_ADDRESS_NO_PORT conditionally (Andrey Ignatov)
> Cc: Andrey Ignatov <>
> Acked-by: Martin KaFai Lau <>
> Signed-off-by: Stanislav Fomichev <>

It seems my Ack from v2 got lost so just reposting it:

Acked-by: Andrey Ignatov <>

Andrey Ignatov

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