join_options_init
merge_options_init
	ENOMEM

concast_node_control
	EINVAL  			sk->type != SOCK_RAW || sk->num == IPPROTO_RAW
	EADDRINUSE		this socket is already a concast_node(calling ip_concast_create twice. */
	ENOMEM

concast_merged_control
	EINPROGRESS		there is already a merged assigned to this flow.

inform_cspd
	EAGAIN			try again there isn't yet a cspd to inform 
		and so forth....

concast_merge
	EPERM
	EADDRINUSE		the socket is already a merge, create, join, or cspd socket 
	EINVAL			optlen < sizeof(struct flowspec)
	ENOMEM			couldn't allocate flowstate structure
	EFAULT			seg fault while copying fspec from user land.
	EAFNOSUPPORT	you specified an invalid concast address.
	errors from:
		merge_options_init
		concast_merged_control

concast_create
	EADDRINUSE		the socket is already a merge, create, or cspd socket
	EINVAL			optlen < sizeof(struct flowspec)
	ENOMEM			couldn't allocate flowstate structure
	EFAULT			seg fault while copying the fspec or merge spec from user land.
	EAFNOSUPPORT	you specified an invalid concast address.
	errors from 
		concast_node_control
		inform_cspd	
	
concast_join
	EADDRINUSE		the socket is already a merge, create, or cspd socket
	EINVAL			optlen < sizeof(struct flowspec)
	ENOMEM			couldn't allocate flowstate structure
	EFAULT			seg fault while copying the fspec or merge spec from user land.
	EAFNOSUPPORT	you specified an invalid concast address.
	errors from 
		if(forwarding)	merge_options_init 	
		if(!forwarding)	join_options_init
		concast_node_contro
		inform_cspd	

concast_cspd
	EPERM
	EINPROGRESS		there is already a cspd using the cspd socket.		
	EINVAL			optlen != sizeof(unsigned short)	
	EFAULT			seq fault while copying optval from user land

concast_getflowstate
	EFAULT			seg fault copying fspec or optlen or from user land
	EFAULT			seg fault copying state optlen options to user land
	EADDRNOTAVAIL	no such flowspec

concast_setflowstate
	EPERM
	EINVAL  	optlen < 0 or not a valid state
	E2BIG		optlen > MAX_FLOW_STATE_OPTLEN
	EFAULT	seg fault copying fspec from user land
	EADDRNOTAVAIL	no such flowspec
	errors from:
		join_options_init
		merge_options_init