blob: b9e4511979028c10d232efbcaca68400fc4f2e7a (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
// 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;
/* Only the sequence delta is relevant */
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_SKB_CB(skb)->cant_coalesce = 1;
mptcp_data_lock(sk);
DEBUG_NET_WARN_ON_ONCE(sock_owned_by_user_nocheck(sk));
skb_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);
}
|
