netdev - [PATCH bpf-next] bpf: omit superfluous address family check in __bpf_skc

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Message-Id: <20220630082618.15649-1-tklauser@distanz.ch>
Date:   Thu, 30 Jun 2022 10:26:18 +0200
From:   Tobias Klauser <tklauser@...tanz.ch>
To:     Martin KaFai Lau <martin.lau@...ux.dev>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH bpf-next] bpf: omit superfluous address family check in __bpf_skc_lookup

family is only set to either AF_INET or AF_INET6 based on len. In all
other cases we return early. Thus the check against AF_UNSPEC can be
omitted.

Signed-off-by: Tobias Klauser <tklauser@...tanz.ch>
---
 net/core/filter.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/net/core/filter.c b/net/core/filter.c
index c6941ab0eb52..4fae91984359 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -6516,8 +6516,8 @@ __bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
 		 u64 flags)
 {
 	struct sock *sk = NULL;
-	u8 family = AF_UNSPEC;
 	struct net *net;
+	u8 family;
 	int sdif;
 
 	if (len == sizeof(tuple->ipv4))
@@ -6527,8 +6527,7 @@ __bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
 	else
 		return NULL;
 
-	if (unlikely(family == AF_UNSPEC || flags ||
-		     !((s32)netns_id < 0 || netns_id <= S32_MAX)))
+	if (unlikely(flags || !((s32)netns_id < 0 || netns_id <= S32_MAX)))
 		goto out;
 
 	if (family == AF_INET)
-- 
2.36.1