linux-kernel - [PATCH bpf] bpf: fix the check that forwarding is enabled in bpf_ipv6_fib

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Date:   Sat, 15 Jun 2019 22:53:48 +0000
From:   Anton Protopopov <a.s.protopopov@...il.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Anton Protopopov <a.s.protopopov@...il.com>
Subject: [PATCH bpf] bpf: fix the check that forwarding is enabled in bpf_ipv6_fib_lookup

The bpf_ipv6_fib_lookup function should return BPF_FIB_LKUP_RET_FWD_DISABLED
when forwarding is disabled for the input device.  However instead of checking
if forwarding is enabled on the input device, it checked the global
net->ipv6.devconf_all->forwarding flag.  Change it to behave as expected.

Signed-off-by: Anton Protopopov <a.s.protopopov@...il.com>
---
 net/core/filter.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/filter.c b/net/core/filter.c
index f615e42cf4ef..3fdf1b21be36 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -4737,7 +4737,7 @@ static int bpf_ipv6_fib_lookup(struct net *net, struct bpf_fib_lookup *params,
 		return -ENODEV;
 
 	idev = __in6_dev_get_safely(dev);
-	if (unlikely(!idev || !net->ipv6.devconf_all->forwarding))
+	if (unlikely(!idev || !idev->cnf.forwarding))
 		return BPF_FIB_LKUP_RET_FWD_DISABLED;
 
 	if (flags & BPF_FIB_LOOKUP_OUTPUT) {
-- 
2.19.1