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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /net/mptcp/fastopen.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'net/mptcp/fastopen.c')
-rw-r--r--net/mptcp/fastopen.c81
1 files changed, 81 insertions, 0 deletions
diff --git a/net/mptcp/fastopen.c b/net/mptcp/fastopen.c
new file mode 100644
index 0000000000..74698582a2
--- /dev/null
+++ b/net/mptcp/fastopen.c
@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: GPL-2.0
+/* MPTCP Fast Open Mechanism
+ *
+ * Copyright (c) 2021-2022, Dmytro SHYTYI
+ */
+
+#include "protocol.h"
+
+void mptcp_fastopen_subflow_synack_set_params(struct mptcp_subflow_context *subflow,
+ struct request_sock *req)
+{
+ struct sock *sk, *ssk;
+ struct sk_buff *skb;
+ struct tcp_sock *tp;
+
+ /* on early fallback the subflow context is deleted by
+ * subflow_syn_recv_sock()
+ */
+ if (!subflow)
+ return;
+
+ ssk = subflow->tcp_sock;
+ sk = subflow->conn;
+ tp = tcp_sk(ssk);
+
+ subflow->is_mptfo = 1;
+
+ skb = skb_peek(&ssk->sk_receive_queue);
+ if (WARN_ON_ONCE(!skb))
+ return;
+
+ /* dequeue the skb from sk receive queue */
+ __skb_unlink(skb, &ssk->sk_receive_queue);
+ skb_ext_reset(skb);
+ skb_orphan(skb);
+
+ /* We copy the fastopen data, but that don't belong to the mptcp sequence
+ * space, need to offset it in the subflow sequence, see mptcp_subflow_get_map_offset()
+ */
+ tp->copied_seq += skb->len;
+ subflow->ssn_offset += skb->len;
+
+ /* initialize a dummy sequence number, we will update it at MPC
+ * completion, if needed
+ */
+ MPTCP_SKB_CB(skb)->map_seq = -skb->len;
+ MPTCP_SKB_CB(skb)->end_seq = 0;
+ MPTCP_SKB_CB(skb)->offset = 0;
+ MPTCP_SKB_CB(skb)->has_rxtstamp = TCP_SKB_CB(skb)->has_rxtstamp;
+
+ mptcp_data_lock(sk);
+
+ mptcp_set_owner_r(skb, sk);
+ __skb_queue_tail(&sk->sk_receive_queue, skb);
+ mptcp_sk(sk)->bytes_received += skb->len;
+
+ sk->sk_data_ready(sk);
+
+ mptcp_data_unlock(sk);
+}
+
+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);
+}