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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@distanz.ch>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220630082618.15649-1-tklauser@distanz.ch
This commit is contained in:
Tobias Klauser 2022-06-30 10:26:18 +02:00 committed by Daniel Borkmann
parent b0d93b4464
commit 2064a132c0
1 changed files with 2 additions and 3 deletions
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5
net/core/filter.c
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@ -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)