From 32e18e7688c6847b0c9db073aafb00639ecf576c Mon Sep 17 00:00:00 2001
From: Oliver Crumrine <ozlinuxc@gmail.com>
Date: Fri, 9 Feb 2024 14:41:22 -0500
Subject: [PATCH] bpf: 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.
v3->v4: Fixed weird merge conflict.
v2->v3: Sent to bpf-next instead of generic patch
v1->v2: Addressed feedback about where check should be removed.
Signed-off-by: Oliver Crumrine <ozlinuxc@gmail.com>
Acked-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/r/7lv62yiyvmj5a7eozv2iznglpkydkdfancgmbhiptrgvgan5sy@3fl3onchgdz3
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
---
include/linux/bpf-cgroup.h | 3 ++-
kernel/bpf/cgroup.c | 3 ---
2 files changed, 2 insertions(+), 4 deletions(-)
diff --git a/include/linux/bpf-cgroup.h b/include/linux/bpf-cgroup.h
index a789266feac36..fb3c3e7181e6d 100644
--- a/include/linux/bpf-cgroup.h
+++ b/include/linux/bpf-cgroup.h
@@ -196,7 +196,8 @@ static inline bool cgroup_bpf_sock_enabled(struct sock *sk,
({ \
int __ret = 0; \
if (cgroup_bpf_enabled(CGROUP_INET_INGRESS) && \
- cgroup_bpf_sock_enabled(sk, 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); \
\
diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c
index 98e0e3835b28b..5a568bbbeaebd 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;
--
2.30.2