/* net_stack_driver.h
 * structures and defines to deal with the network stack pseudo-driver...
 */

#ifndef NET_STACK_DRIVER_H
#define NET_STACK_DRIVER_H

#include <OS.h>			
#include <sys/select.h>

// Forward declaration
struct sockaddr; 

#define NET_STACK_DRIVER_DEV	"net/stack"
#define NET_STACK_DRIVER_PATH	"/dev/" NET_STACK_DRIVER_DEV

enum {
	// Paranoia mode: be far away of B_DEVICE_OP_CODES_END opcodes!!!
	// You never know what another device driver ioctl() will do
	// if think our NET_STACK_* is in fact his DO_RISKY_BUSINESS opcode, or whatever...
 	NET_IOCTL_BASE = 0xbe230000,
	NET_STACK_IOCTL_BASE = NET_IOCTL_BASE + 0x200
};

enum {
	// ops not acting on an existing socket
	NET_STACK_SOCKET = NET_STACK_IOCTL_BASE,	// socket_args *
	NET_STACK_GET_COOKIE,                       // void ** 
	NET_STACK_CONTROL_NET_MODULE,				// control_net_module_args *
	NET_STACK_SYSCTL,							// sysctl_args *
	
	// ops acting on an existing socket
	NET_STACK_BIND,								// sockaddr_args *
	NET_STACK_RECVFROM,							// struct msghdr *
	NET_STACK_RECV,								// transfer_args *
	NET_STACK_SENDTO,							// struct msghdr *
	NET_STACK_SEND,								// transfer_args *
	NET_STACK_LISTEN,							// int_args * (value = backlog)
	NET_STACK_ACCEPT,							// sockaddr_args *
	NET_STACK_CONNECT,							// sockaddr_args *
	NET_STACK_SHUTDOWN,							// int_args * (value = how)
	NET_STACK_GETSOCKOPT,						// sockopt_args *
	NET_STACK_SETSOCKOPT,						// sockopt_args *
	NET_STACK_GETSOCKNAME,						// sockaddr_args *
	NET_STACK_GETPEERNAME,						// sockaddr_args *
	NET_STACK_SOCKETPAIR,						// socketpair_args *
	
	// TODO: remove R5 select() emulation
	NET_STACK_SELECT,							// select_args *
	NET_STACK_DESELECT,							// select_args *
	
	NET_STACK_NOTIFY_SOCKET_EVENT,				// notify_socket_event_args * (userland stack only)
	
	NET_STACK_IOCTL_MAX
};

struct sockaddr_args {	// used by NET_STACK_CONNECT/_BIND/_GETSOCKNAME/_GETPEERNAME
	struct sockaddr *addr;
	int addrlen;
};

struct sockopt_args {	// used by NET_STACK_SETSOCKOPT/_GETSOCKOPT
	int   	level;
	int   	option;
	void  *optval;
	int   	optlen;
};

struct transfer_args {	// used by NET_STACK_SEND/_RECV
	void *data;
	size_t datalen;
	int flags;
	struct sockaddr *addr;	// unused in *_SEND and *_RECV cases
	int addrlen;			// unused in *_SEND and *_RECV cases
};

struct socket_args {	// used by NET_STACK_SOCKET
	int family;
	int type;
	int proto;
};

struct socketpair_args {	// used by NET_STACK_SOCKETPAIR
	void *cookie;
};

struct accept_args {  // used by NET_STACK_ACCEPT 
	void *cookie; 
	struct sockaddr *addr; 
	int addrlen; 
};

struct sysctl_args {	// used by NET_STACK_SYSCTL
	int *name;
	uint namelen;
	void *oldp;
	size_t *oldlenp;
	void *newp;
	size_t newlen;
};

struct control_net_module_args {	// used by NET_STACK_CONTROL_NET_MODULE
	const char *name;
	uint32 op;
	void *data;
	size_t length;
};

/*
	Userland stack driver on_socket_event() callback mecanism implementation:
	the driver start a kernel thread waiting on a port for
	a NET_STACK_SOCKET_EVENT_MSG message, which come with a socket_event_data block.

	The on_socket_event() mechanism stay in driver (kernelland) because it's
	only there we can call kernel's notify_select_event() on BONE systems.
	For non-BONE systems, we use our own r5_notify_select_event()
	implementation, that could be moved into the userland net_server code,
	but it'll have split (again!) the /dev/net/stack driver code...
*/  
   
struct notify_socket_event_args {	// used by NET_STACK_NOTIFY_SOCKET_EVENT
	port_id notify_port;	// port waiting for notification, -1 = stop notify
	void * cookie;			// this cookie value will be pass back in the socket_event_args
};

#define NET_STACK_SOCKET_EVENT_NOTIFICATION	'sevn'

struct socket_event_data {
	uint32 event;	// B_SELECT_READ, B_SELECT_WRITE or B_SELECT_ERROR
	void * cookie;	// The cookie as set in notify_socket_event_args for this socket
};

/*
	R5.0.3 and before select() kernel support is too buggy to be used, so
	here are the structures we used to support select() on sockets, and *only* on
	sockets!
*/

struct select_args {	// used by NET_STACK_SELECT and NET_STACK_DESELECT
	struct selectsync * sync;	// in fact, it's the area_id of a r5_selectsync struct!!!
	uint32 ref;
};

struct r5_selectsync {
	sem_id lock;	// lock this r5_selectsync
	sem_id wakeup;	// sem to release to wakeup select()
	struct fd_set rbits;	// read event bits field
	struct fd_set wbits;	// write event bits field
	struct fd_set ebits;	// exception event bits field
};


struct stack_driver_args {
	union {
		int								integer;
		struct socket_args				socket;
		struct accept_args				accept;
		struct sockaddr_args 			sockaddr;
		struct sockopt_args				sockopt;
		struct transfer_args			transfer;
		struct sysctl_args				sysctl;
		struct select_args				select;
		struct control_net_module_args	control;
		struct socketpair_args				socketpair;
	} u;
};

#endif /* NET_STACK_DRIVER_H */