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SubjectRe: Linux 5.17.11
Date
diff --git a/Makefile b/Makefile
index 318597a4147e..b821f270a4ca 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
VERSION = 5
PATCHLEVEL = 17
-SUBLEVEL = 10
+SUBLEVEL = 11
EXTRAVERSION =
NAME = Superb Owl

diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index aec767ee047a..46b343a0b17e 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -442,7 +442,8 @@ struct mptcp_subflow_context {
rx_eof : 1,
can_ack : 1, /* only after processing the remote a key */
disposable : 1, /* ctx can be free at ulp release time */
- stale : 1; /* unable to snd/rcv data, do not use for xmit */
+ stale : 1, /* unable to snd/rcv data, do not use for xmit */
+ valid_csum_seen : 1; /* at least one csum validated */
enum mptcp_data_avail data_avail;
u32 remote_nonce;
u64 thmac;
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index 651f01d13191..8d5ddf8e3ef7 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -913,11 +913,14 @@ static enum mapping_status validate_data_csum(struct sock *ssk, struct sk_buff *
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);
+ if (subflow->mp_join || subflow->valid_csum_seen) {
+ subflow->send_mp_fail = 1;
+ MPTCP_INC_STATS(sock_net(ssk), MPTCP_MIB_MPFAILTX);
+ }
return subflow->mp_join ? MAPPING_INVALID : MAPPING_DUMMY;
}

+ subflow->valid_csum_seen = 1;
return MAPPING_OK;
}

@@ -1099,6 +1102,18 @@ static void subflow_sched_work_if_closed(struct mptcp_sock *msk, struct sock *ss
}
}

+static bool subflow_can_fallback(struct mptcp_subflow_context *subflow)
+{
+ struct mptcp_sock *msk = mptcp_sk(subflow->conn);
+
+ if (subflow->mp_join)
+ return false;
+ else if (READ_ONCE(msk->csum_enabled))
+ return !subflow->valid_csum_seen;
+ else
+ return !subflow->fully_established;
+}
+
static bool subflow_check_data_avail(struct sock *ssk)
{
struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
@@ -1176,7 +1191,7 @@ static bool subflow_check_data_avail(struct sock *ssk)
return true;
}

- if (subflow->mp_join || subflow->fully_established) {
+ if (!subflow_can_fallback(subflow)) {
/* fatal protocol error, close the socket.
* subflow_error_report() will introduce the appropriate barriers
*/
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