linux-kernel - Re: [PATCH] net: remove check before __cgroup_bpf_run_filter

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Date: Thu, 8 Feb 2024 16:43:06 -0800
From: Stanislav Fomichev <sdf@...gle.com>
To: Oliver Crumrine <ozlinuxc@...il.com>
Cc: ast@...nel.org, daniel@...earbox.net, john.fastabend@...il.com, 
	andrii@...nel.org, martin.lau@...ux.dev, song@...nel.org, 
	yonghong.song@...ux.dev, kpsingh@...nel.org, haoluo@...gle.com, 
	jolsa@...nel.org, bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: remove check before __cgroup_bpf_run_filter_skb

On 02/08, Oliver Crumrine wrote:
> Checking if __sk is a full socket in macro 
> BPF_CGROUP_RUN_PROG_INET_EGRESS is redundant, as the same check is 
> done in function __cgroup_bpf_run_filter_skb, called as part of the 
> macro.

The check is here to make sure we only run this hook on non-req sockets.
Dropping it would mean we'd be running the hook on the listeners
instead. I don't think we want that.