1 #ifndef __LINUX_GENERIC_NETLINK_H
2 #define __LINUX_GENERIC_NETLINK_H
4 #include <linux/types.h>
5 #include <linux/netlink.h>
7 #define GENL_NAMSIZ 16 /* length of family name */
9 #define GENL_MIN_ID NLMSG_MIN_TYPE
10 #define GENL_MAX_ID 1023
18 #define GENL_HDRLEN NLMSG_ALIGN(sizeof(struct genlmsghdr))
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
26 * List of reserved static generic netlink identifiers:
28 #define GENL_ID_GENERATE 0
29 #define GENL_ID_CTRL NLMSG_MIN_TYPE
31 /**************************************************************************
33 **************************************************************************/
43 CTRL_CMD_NEWMCAST_GRP
,
44 CTRL_CMD_DELMCAST_GRP
,
45 CTRL_CMD_GETMCAST_GRP
, /* unused */
49 #define CTRL_CMD_MAX (__CTRL_CMD_MAX - 1)
54 CTRL_ATTR_FAMILY_NAME
,
59 CTRL_ATTR_MCAST_GROUPS
,
63 #define CTRL_ATTR_MAX (__CTRL_ATTR_MAX - 1)
72 #define CTRL_ATTR_OP_MAX (__CTRL_ATTR_OP_MAX - 1)
75 CTRL_ATTR_MCAST_GRP_UNSPEC
,
76 CTRL_ATTR_MCAST_GRP_NAME
,
77 CTRL_ATTR_MCAST_GRP_ID
,
78 __CTRL_ATTR_MCAST_GRP_MAX
,
81 #define CTRL_ATTR_MCAST_GRP_MAX (__CTRL_ATTR_MCAST_GRP_MAX - 1)
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);
93 * rcu_dereference_genl - rcu_dereference with debug checking
94 * @p: The pointer to read, prior to dereferencing
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()
99 #define rcu_dereference_genl(p) \
100 rcu_dereference_check(p, lockdep_genl_is_held())
103 * genl_dereference - fetch RCU pointer when updates are prevented by genl mutex
104 * @p: The pointer to read, prior to dereferencing
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.
110 #define genl_dereference(p) \
111 rcu_dereference_protected(p, lockdep_genl_is_held())
113 #endif /* __KERNEL__ */
115 #endif /* __LINUX_GENERIC_NETLINK_H */