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 */