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-rw-r--r--net/mptcp/fastopen.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/net/mptcp/fastopen.c b/net/mptcp/fastopen.c
new file mode 100644
index 000000000000..19c332af0834
--- /dev/null
+++ b/net/mptcp/fastopen.c
@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: GPL-2.0
+/* MPTCP Fast Open Mechanism
+ *
+ * Copyright (c) 2021-2022, Dmytro SHYTYI
+ */
+
+#include "protocol.h"
+
+void mptcp_fastopen_gen_msk_ackseq(struct mptcp_sock *msk, struct mptcp_subflow_context *subflow,
+ const struct mptcp_options_received *mp_opt)
+{
+ struct sock *sk = (struct sock *)msk;
+ struct sk_buff *skb;
+
+ mptcp_data_lock(sk);
+ skb = skb_peek_tail(&sk->sk_receive_queue);
+ if (skb) {
+ WARN_ON_ONCE(MPTCP_SKB_CB(skb)->end_seq);
+ pr_debug("msk %p moving seq %llx -> %llx end_seq %llx -> %llx", sk,
+ MPTCP_SKB_CB(skb)->map_seq, MPTCP_SKB_CB(skb)->map_seq + msk->ack_seq,
+ MPTCP_SKB_CB(skb)->end_seq, MPTCP_SKB_CB(skb)->end_seq + msk->ack_seq);
+ MPTCP_SKB_CB(skb)->map_seq += msk->ack_seq;
+ MPTCP_SKB_CB(skb)->end_seq += msk->ack_seq;
+ }
+
+ pr_debug("msk=%p ack_seq=%llx", msk, msk->ack_seq);
+ mptcp_data_unlock(sk);
+}