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3bc253c2 GT |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* Multipath TCP | |
3 | * | |
4 | * Copyright (c) 2020, Tessares SA. | |
5 | * Copyright (c) 2022, SUSE. | |
6 | * | |
7 | * Author: Nicolas Rybowski <nicolas.rybowski@tessares.net> | |
8 | */ | |
9 | ||
10 | #define pr_fmt(fmt) "MPTCP: " fmt | |
11 | ||
12 | #include <linux/bpf.h> | |
13 | #include "protocol.h" | |
14 | ||
15 | struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk) | |
16 | { | |
17 | if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP && sk_is_mptcp(sk)) | |
18 | return mptcp_sk(mptcp_subflow_ctx(sk)->conn); | |
19 | ||
20 | return NULL; | |
21 | } | |
0dd061a6 GT |
22 | |
23 | BTF_SET8_START(bpf_mptcp_fmodret_ids) | |
24 | BTF_ID_FLAGS(func, update_socket_protocol) | |
25 | BTF_SET8_END(bpf_mptcp_fmodret_ids) | |
26 | ||
27 | static const struct btf_kfunc_id_set bpf_mptcp_fmodret_set = { | |
28 | .owner = THIS_MODULE, | |
29 | .set = &bpf_mptcp_fmodret_ids, | |
30 | }; | |
31 | ||
32 | static int __init bpf_mptcp_kfunc_init(void) | |
33 | { | |
34 | return register_btf_fmodret_id_set(&bpf_mptcp_fmodret_set); | |
35 | } | |
36 | late_initcall(bpf_mptcp_kfunc_init); |