bind.c

 1// SPDX-License-Identifier: GPL-2.0
 2/*  OpenVPN data channel offload
 3 *
 4 *  Copyright (C) 2012-2025 OpenVPN, Inc.
 5 *
 6 *  Author:	James Yonan <james@openvpn.net>
 7 *		Antonio Quartulli <antonio@openvpn.net>
 8 */
 9
10#include <linux/netdevice.h>
11#include <linux/socket.h>
12
13#include "ovpnpriv.h"
14#include "bind.h"
15#include "peer.h"
16
17/**
18 * ovpn_bind_from_sockaddr - retrieve binding matching sockaddr
19 * @ss: the sockaddr to match
20 *
21 * Return: the bind matching the passed sockaddr if found, NULL otherwise
22 */
23struct ovpn_bind *ovpn_bind_from_sockaddr(const struct sockaddr_storage *ss)
24{
25	struct ovpn_bind *bind;
26	size_t sa_len;
27
28	if (ss->ss_family == AF_INET)
29		sa_len = sizeof(struct sockaddr_in);
30	else if (ss->ss_family == AF_INET6)
31		sa_len = sizeof(struct sockaddr_in6);
32	else
33		return ERR_PTR(-EAFNOSUPPORT);
34
35	bind = kzalloc(sizeof(*bind), GFP_ATOMIC);
36	if (unlikely(!bind))
37		return ERR_PTR(-ENOMEM);
38
39	memcpy(&bind->remote, ss, sa_len);
40
41	return bind;
42}
43
44/**
45 * ovpn_bind_reset - assign new binding to peer
46 * @peer: the peer whose binding has to be replaced
47 * @new: the new bind to assign
48 */
49void ovpn_bind_reset(struct ovpn_peer *peer, struct ovpn_bind *new)
50{
51	lockdep_assert_held(&peer->lock);
52
53	kfree_rcu(rcu_replace_pointer(peer->bind, new,
54				      lockdep_is_held(&peer->lock)), rcu);
55}