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. */ 9 extern void genl_lock(void); 10 extern void genl_unlock(void); 11 #ifdef CONFIG_LOCKDEP 12 extern bool lockdep_genl_is_held(void); 13 #endif 14 15 /* for synchronisation between af_netlink and genetlink */ 16 extern atomic_t genl_sk_destructing_cnt; 17 extern 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