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