1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __LINUX_GENERIC_NETLINK_H
3#define __LINUX_GENERIC_NETLINK_H
4
5#include <uapi/linux/genetlink.h>
6
7
8/* All generic netlink requests are serialized by a global lock. */
9extern void genl_lock(void);
10extern void genl_unlock(void);
11#ifdef CONFIG_LOCKDEP
12extern bool lockdep_genl_is_held(void);
13#endif
14
15/* for synchronisation between af_netlink and genetlink */
16extern atomic_t genl_sk_destructing_cnt;
17extern wait_queue_head_t genl_sk_destructing_waitq;
18
19/**
20 * rcu_dereference_genl - rcu_dereference with debug checking
21 * @p: The pointer to read, prior to dereferencing
22 *
23 * Do an rcu_dereference(p), but check caller either holds rcu_read_lock()
24 * or genl mutex. Note : Please prefer genl_dereference() or rcu_dereference()
25 */
26#define rcu_dereference_genl(p) \
27 rcu_dereference_check(p, lockdep_genl_is_held())
28
29/**
30 * genl_dereference - fetch RCU pointer when updates are prevented by genl mutex
31 * @p: The pointer to read, prior to dereferencing
32 *
33 * Return the value of the specified RCU-protected pointer, but omit
34 * the READ_ONCE(), because caller holds genl mutex.
35 */
36#define genl_dereference(p) \
37 rcu_dereference_protected(p, lockdep_genl_is_held())
38
39#define MODULE_ALIAS_GENL_FAMILY(family)\
40 MODULE_ALIAS_NET_PF_PROTO_NAME(PF_NETLINK, NETLINK_GENERIC, "-family-" family)
41
42#endif /* __LINUX_GENERIC_NETLINK_H */
43