[PATCH net-next 1/5] mptcp: do not set unconditionally csum_reqd on incoming opt

[Mat Martineau <mathew.j.martineau@linux.intel.com>]

From: Paolo Abeni <pabeni@redhat.com>

Should be set only if the ingress packets present it, otherwise
we can confuse csum validation.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
---
 net/mptcp/options.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index bec3ed82e253..f012a71dd996 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -355,8 +355,6 @@ void mptcp_get_options(const struct sock *sk,
 		       const struct sk_buff *skb,
 		       struct mptcp_options_received *mp_opt)
 {
-	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
-	struct mptcp_sock *msk = mptcp_sk(subflow->conn);
 	const struct tcphdr *th = tcp_hdr(skb);
 	const unsigned char *ptr;
 	int length;
@@ -372,7 +370,7 @@ void mptcp_get_options(const struct sock *sk,
 	mp_opt->dss = 0;
 	mp_opt->mp_prio = 0;
 	mp_opt->reset = 0;
-	mp_opt->csum_reqd = READ_ONCE(msk->csum_enabled);
+	mp_opt->csum_reqd = 0;
 	mp_opt->deny_join_id0 = 0;
 	mp_opt->mp_fail = 0;
 
-- 
2.33.0