| 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 | } |
| 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(kset: &bpf_mptcp_fmodret_set); |
| 35 | } |
| 36 | late_initcall(bpf_mptcp_kfunc_init); |
| 37 |