From dfc8d06030335a816d81aa92fe5d1f84d06998ad Mon Sep 17 00:00:00 2001 From: Dmytro Shytyi Date: Fri, 25 Nov 2022 23:29:50 +0100 Subject: mptcp: implement delayed seq generation for passive fastopen With fastopen in place, the first subflow socket is created before the MPC handshake completes, and we need to properly initialize the sequence numbers at MPC ACK reception. Co-developed-by: Paolo Abeni Signed-off-by: Paolo Abeni Co-developed-by: Matthieu Baerts Signed-off-by: Matthieu Baerts Signed-off-by: Dmytro Shytyi Signed-off-by: Matthieu Baerts Signed-off-by: Jakub Kicinski --- net/mptcp/fastopen.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 net/mptcp/fastopen.c (limited to 'net/mptcp/fastopen.c') 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); +} -- cgit v1.2.3