[GENL]: Provide more information to userspace about registered genl families

Additionaly exports the following information when providing
the list of registered generic netlink families:
  - protocol version
  - header size
  - maximum number of attributes
  - list of available operations including
      - id
      - flags
      - avaiability of policy and doit/dumpit function

libnl HEAD provides a utility to read this new information:

	0x0010 nlctrl version 1
	    hdrsize 0 maxattr 6
	      op GETFAMILY (0x03) [POLICY,DOIT,DUMPIT]
	0x0011 NLBL_MGMT version 1
	    hdrsize 0 maxattr 0
	      op unknown (0x02) [DOIT]
	      op unknown (0x03) [DOIT]
	      ....

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 18 insertions, 0 deletions

diff --git a/include/linux/genetlink.h b/include/linux/genetlink.h
index 84f12a41dc01..9049dc65ae51 100644
--- a/include/linux/genetlink.h
+++ b/include/linux/genetlink.h
@@ -16,6 +16,8 @@ struct genlmsghdr {
 
 #define GENL_HDRLEN     NLMSG_ALIGN(sizeof(struct genlmsghdr))
 
+#define GENL_ADMIN_PERM         0x01
+
 /*
  * List of reserved static generic netlink identifiers:
  */
@@ -43,9 +45,25 @@ enum {
         CTRL_ATTR_UNSPEC,
         CTRL_ATTR_FAMILY_ID,
         CTRL_ATTR_FAMILY_NAME,
+        CTRL_ATTR_VERSION,
+        CTRL_ATTR_HDRSIZE,
+        CTRL_ATTR_MAXATTR,
+        CTRL_ATTR_OPS,
         __CTRL_ATTR_MAX,
 };
 
 #define CTRL_ATTR_MAX (__CTRL_ATTR_MAX - 1)
 
+enum {
+        CTRL_ATTR_OP_UNSPEC,
+        CTRL_ATTR_OP_ID,
+        CTRL_ATTR_OP_FLAGS,
+        CTRL_ATTR_OP_POLICY,
+        CTRL_ATTR_OP_DOIT,
+        CTRL_ATTR_OP_DUMPIT,
+        __CTRL_ATTR_OP_MAX,
+};
+
+#define CTRL_ATTR_OP_MAX (__CTRL_ATTR_OP_MAX - 1)
+
 #endif  /* __LINUX_GENERIC_NETLINK_H */