caif: Rewritten socket implementation

Changes:
 This is a complete re-write of the socket layer. Making the socket
 implementation more aligned with the other socket layers and using more
 of the support functions available in sock.c. Lots of code is copied
 from af_unix (and some from af_irda).
 Non-blocking mode should be working as well.
Signed-off-by: Sjur Braendeland <sjur.brandeland@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/caif/caif_socket.h

@@ -16,7 +16,6 @@
 #include <sys/socket.h>
 #endif
 
-
 /**
  * enum caif_link_selector -    Physical Link Selection.
  * @CAIF_LINK_HIGH_BANDW:	Physical interface for high-bandwidth
@@ -87,6 +86,7 @@ enum caif_at_type {
 
 /**
  * struct sockaddr_caif - the sockaddr structure for CAIF sockets.
+ * @family:		     Address family number, must be AF_CAIF.
  * @u:			     Union of address data 'switched' by family.
  * :
  * @u.at:                    Applies when family = CAIFPROTO_AT.
@@ -153,6 +153,7 @@ struct sockaddr_caif {
  *
  *
  * This enum defines the CAIF Socket options to be used on a socket
+ * of type PF_CAIF.
  *
  */
 enum caif_socket_opts {