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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
482a8524 TG |
2 | #ifndef __LINUX_GENERIC_NETLINK_H |
3 | #define __LINUX_GENERIC_NETLINK_H | |
4 | ||
607ca46e | 5 | #include <uapi/linux/genetlink.h> |
482a8524 | 6 | |
f408e0ce JC |
7 | |
8 | /* All generic netlink requests are serialized by a global lock. */ | |
9 | extern void genl_lock(void); | |
10 | extern void genl_unlock(void); | |
320f5ea0 | 11 | #ifdef CONFIG_LOCKDEP |
61d03535 | 12 | extern bool lockdep_genl_is_held(void); |
86b1309c | 13 | #endif |
f408e0ce | 14 | |
ee1c2442 JB |
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 | ||
b4e16611 JG |
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 | |
632a5c1c | 34 | * the READ_ONCE(), because caller holds genl mutex. |
b4e16611 JG |
35 | */ |
36 | #define genl_dereference(p) \ | |
37 | rcu_dereference_protected(p, lockdep_genl_is_held()) | |
38 | ||
e9412c37 NH |
39 | #define MODULE_ALIAS_GENL_FAMILY(family)\ |
40 | MODULE_ALIAS_NET_PF_PROTO_NAME(PF_NETLINK, NETLINK_GENERIC, "-family-" family) | |
41 | ||
482a8524 | 42 | #endif /* __LINUX_GENERIC_NETLINK_H */ |