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// 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);
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);
}
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