| | 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. */ |
| | 8 | extern void genl_lock(void); |
| | 9 | extern void genl_unlock(void); |
| | 10 | #ifdef CONFIG_LOCKDEP |
| | 11 | extern int lockdep_genl_is_held(void); |
| | 12 | #endif |
| | 13 | |
| | 14 | /* for synchronisation between af_netlink and genetlink */ |
| | 15 | extern atomic_t genl_sk_destructing_cnt; |
| | 16 | extern 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 */ |
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