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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __LINUX_GENERIC_NETLINK_H #define __LINUX_GENERIC_NETLINK_H #include <uapi/linux/genetlink.h> /* All generic netlink requests are serialized by a global lock. */ extern void genl_lock(void); extern void genl_unlock(void); #ifdef CONFIG_LOCKDEP extern bool lockdep_genl_is_held(void); #endif /* for synchronisation between af_netlink and genetlink */ extern atomic_t genl_sk_destructing_cnt; extern wait_queue_head_t genl_sk_destructing_waitq; /** * rcu_dereference_genl - rcu_dereference with debug checking * @p: The pointer to read, prior to dereferencing * * Do an rcu_dereference(p), but check caller either holds rcu_read_lock() * or genl mutex. Note : Please prefer genl_dereference() or rcu_dereference() */ #define rcu_dereference_genl(p) \ rcu_dereference_check(p, lockdep_genl_is_held()) /** * genl_dereference - fetch RCU pointer when updates are prevented by genl mutex * @p: The pointer to read, prior to dereferencing * * Return the value of the specified RCU-protected pointer, but omit * the READ_ONCE(), because caller holds genl mutex. */ #define genl_dereference(p) \ rcu_dereference_protected(p, lockdep_genl_is_held()) #define MODULE_ALIAS_GENL_FAMILY(family)\ MODULE_ALIAS_NET_PF_PROTO_NAME(PF_NETLINK, NETLINK_GENERIC, "-family-" family) #endif /* __LINUX_GENERIC_NETLINK_H */