linux-kernel - [PATCH v2] net: remove check in __cgroup_bpf_run_filter

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Date: Fri, 9 Feb 2024 11:59:25 -0500
From: Oliver Crumrine <ozlinuxc@...il.com>
To: 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, sdf@...gle.com, haoluo@...gle.com, jolsa@...nel.org
Cc: bpf@...r.kernel.org, linux-kernel@...r.kernel.org, sinquersw@...il.com
Subject: [PATCH v2] net: remove check in __cgroup_bpf_run_filter_skb

Originally, this patch removed a redundant check in
BPF_CGROUP_RUN_PROG_INET_EGRESS, as the check was already being done in
the function it called, __cgroup_bpf_run_filter_skb. For v2, it was
reccomended that I remove the check from __cgroup_bpf_run_filter_skb,
and add the checks to the other macro that calls that function,
BPF_CGROUP_RUN_PROG_INET_INGRESS.

To sum it up, checking that the socket exists and that it is a full
socket is now part of both macros BPF_CGROUP_RUN_PROG_INET_EGRESS and
BPF_CGROUP_RUN_PROG_INET_INGRESS, and it is no longer part of the
function they call, __cgroup_bpf_run_filter_skb.

Signed-off-by: Oliver Crumrine <ozlinuxc@...il.com>

v1->v2: Addressed feedback about where check should be removed.

---
 include/linux/bpf-cgroup.h | 7 ++++---
 kernel/bpf/cgroup.c        | 3 ---
 2 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/include/linux/bpf-cgroup.h b/include/linux/bpf-cgroup.h
index a789266feac3..b28dc0ff4218 100644
--- a/include/linux/bpf-cgroup.h
+++ b/include/linux/bpf-cgroup.h
@@ -195,10 +195,11 @@ static inline bool cgroup_bpf_sock_enabled(struct sock *sk,
 #define BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb)			      \
 ({									      \
 	int __ret = 0;							      \
-	if (cgroup_bpf_enabled(CGROUP_INET_INGRESS) &&			      \
-	    cgroup_bpf_sock_enabled(sk, CGROUP_INET_INGRESS))		      \
+	if (cgroup_bpf_enabled(CGROUP_INET_INGRESS) &&			      \
+	    cgroup_bpf_sock_enabled(sk, CGROUP_INET_INGRESS) && sk &&	      \
+	    sk_fullsock(sk))						      \
 		__ret = __cgroup_bpf_run_filter_skb(sk, skb,		      \
-						    CGROUP_INET_INGRESS);     \
+						    CGROUP_INET_INGRESS);     \
 									      \
 	__ret;								      \
 })
diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c
index 491d20038cbe..644bfb39cf9d 100644
--- a/kernel/bpf/cgroup.c
+++ b/kernel/bpf/cgroup.c
@@ -1364,9 +1364,6 @@ int __cgroup_bpf_run_filter_skb(struct sock *sk,
 	struct cgroup *cgrp;
 	int ret;
 
-	if (!sk || !sk_fullsock(sk))
-		return 0;
-
 	if (sk->sk_family != AF_INET && sk->sk_family != AF_INET6)
 		return 0;
 
-- 
2.43.0


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