This is a note to let you know that I've just added the patch titled
mptcp: reuse __mptcp_make_csum in validate_data_csum
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mptcp-reuse-__mptcp_make_csum-in-validate_data_csum.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit c2f97c875f720486060fa9263316cb67318c7165
Author: Geliang Tang <geliang.tang@xxxxxxxx>
Date: Fri Jan 7 11:25:24 2022 -0800
mptcp: reuse __mptcp_make_csum in validate_data_csum
[ Upstream commit 8401e87f5a36d370cbf1e9d4ba602a553ce9324a ]
This patch reused __mptcp_make_csum() in validate_data_csum() instead of
open-coding.
Signed-off-by: Geliang Tang <geliang.tang@xxxxxxxx>
Signed-off-by: Mat Martineau <mathew.j.martineau@xxxxxxxxxxxxxxx>
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index 6172f380dfb7..04afead7316f 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -845,9 +845,8 @@ static enum mapping_status validate_data_csum(struct sock *ssk, struct sk_buff *
bool csum_reqd)
{
struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
- struct csum_pseudo_header header;
u32 offset, seq, delta;
- __wsum csum;
+ u16 csum;
int len;
if (!csum_reqd)
@@ -908,13 +907,11 @@ static enum mapping_status validate_data_csum(struct sock *ssk, struct sk_buff *
* while the pseudo header requires the original DSS data len,
* including that
*/
- header.data_seq = cpu_to_be64(subflow->map_seq);
- header.subflow_seq = htonl(subflow->map_subflow_seq);
- header.data_len = htons(subflow->map_data_len + subflow->map_data_fin);
- header.csum = 0;
-
- csum = csum_partial(&header, sizeof(header), subflow->map_data_csum);
- if (unlikely(csum_fold(csum))) {
+ csum = __mptcp_make_csum(subflow->map_seq,
+ subflow->map_subflow_seq,
+ subflow->map_data_len + subflow->map_data_fin,
+ subflow->map_data_csum);
+ if (unlikely(csum)) {
MPTCP_INC_STATS(sock_net(ssk), MPTCP_MIB_DATACSUMERR);
subflow->send_mp_fail = 1;
MPTCP_INC_STATS(sock_net(ssk), MPTCP_MIB_MPFAILTX);
