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