Merge tag 'mce-recovery-for-tip' of git://git.kernel.org/pub/scm/linux/kernel/git...
[firefly-linux-kernel-4.4.55.git] / include / linux / genetlink.h
1 #ifndef __LINUX_GENERIC_NETLINK_H
2 #define __LINUX_GENERIC_NETLINK_H
3
4 #include <linux/types.h>
5 #include <linux/netlink.h>
6
7 #define GENL_NAMSIZ     16      /* length of family name */
8
9 #define GENL_MIN_ID     NLMSG_MIN_TYPE
10 #define GENL_MAX_ID     1023
11
12 struct genlmsghdr {
13         __u8    cmd;
14         __u8    version;
15         __u16   reserved;
16 };
17
18 #define GENL_HDRLEN     NLMSG_ALIGN(sizeof(struct genlmsghdr))
19
20 #define GENL_ADMIN_PERM         0x01
21 #define GENL_CMD_CAP_DO         0x02
22 #define GENL_CMD_CAP_DUMP       0x04
23 #define GENL_CMD_CAP_HASPOL     0x08
24
25 /*
26  * List of reserved static generic netlink identifiers:
27  */
28 #define GENL_ID_GENERATE        0
29 #define GENL_ID_CTRL            NLMSG_MIN_TYPE
30
31 /**************************************************************************
32  * Controller
33  **************************************************************************/
34
35 enum {
36         CTRL_CMD_UNSPEC,
37         CTRL_CMD_NEWFAMILY,
38         CTRL_CMD_DELFAMILY,
39         CTRL_CMD_GETFAMILY,
40         CTRL_CMD_NEWOPS,
41         CTRL_CMD_DELOPS,
42         CTRL_CMD_GETOPS,
43         CTRL_CMD_NEWMCAST_GRP,
44         CTRL_CMD_DELMCAST_GRP,
45         CTRL_CMD_GETMCAST_GRP, /* unused */
46         __CTRL_CMD_MAX,
47 };
48
49 #define CTRL_CMD_MAX (__CTRL_CMD_MAX - 1)
50
51 enum {
52         CTRL_ATTR_UNSPEC,
53         CTRL_ATTR_FAMILY_ID,
54         CTRL_ATTR_FAMILY_NAME,
55         CTRL_ATTR_VERSION,
56         CTRL_ATTR_HDRSIZE,
57         CTRL_ATTR_MAXATTR,
58         CTRL_ATTR_OPS,
59         CTRL_ATTR_MCAST_GROUPS,
60         __CTRL_ATTR_MAX,
61 };
62
63 #define CTRL_ATTR_MAX (__CTRL_ATTR_MAX - 1)
64
65 enum {
66         CTRL_ATTR_OP_UNSPEC,
67         CTRL_ATTR_OP_ID,
68         CTRL_ATTR_OP_FLAGS,
69         __CTRL_ATTR_OP_MAX,
70 };
71
72 #define CTRL_ATTR_OP_MAX (__CTRL_ATTR_OP_MAX - 1)
73
74 enum {
75         CTRL_ATTR_MCAST_GRP_UNSPEC,
76         CTRL_ATTR_MCAST_GRP_NAME,
77         CTRL_ATTR_MCAST_GRP_ID,
78         __CTRL_ATTR_MCAST_GRP_MAX,
79 };
80
81 #define CTRL_ATTR_MCAST_GRP_MAX (__CTRL_ATTR_MCAST_GRP_MAX - 1)
82
83 #ifdef __KERNEL__
84
85 /* All generic netlink requests are serialized by a global lock.  */
86 extern void genl_lock(void);
87 extern void genl_unlock(void);
88 #ifdef CONFIG_PROVE_LOCKING
89 extern int lockdep_genl_is_held(void);
90 #endif
91
92 /**
93  * rcu_dereference_genl - rcu_dereference with debug checking
94  * @p: The pointer to read, prior to dereferencing
95  *
96  * Do an rcu_dereference(p), but check caller either holds rcu_read_lock()
97  * or genl mutex. Note : Please prefer genl_dereference() or rcu_dereference()
98  */
99 #define rcu_dereference_genl(p)                                 \
100         rcu_dereference_check(p, lockdep_genl_is_held())
101
102 /**
103  * genl_dereference - fetch RCU pointer when updates are prevented by genl mutex
104  * @p: The pointer to read, prior to dereferencing
105  *
106  * Return the value of the specified RCU-protected pointer, but omit
107  * both the smp_read_barrier_depends() and the ACCESS_ONCE(), because
108  * caller holds genl mutex.
109  */
110 #define genl_dereference(p)                                     \
111         rcu_dereference_protected(p, lockdep_genl_is_held())
112
113 #endif /* __KERNEL__ */
114
115 #endif  /* __LINUX_GENERIC_NETLINK_H */