[u-boot.git] / include / net.h

/*
 *	LiMon Monitor (LiMon) - Network.
 *
 *	Copyright 1994 - 2000 Neil Russell.
 *	(See License)
 *
 *
 * History
 *	9/16/00	  bor  adapted to TQM823L/STK8xxL board, RARP/TFTP boot added
 */

#ifndef __NET_H__
#define __NET_H__

#if !defined(CONFIG_NET_MULTI) && defined(CONFIG_8xx)
#include <commproc.h>
#if defined(FEC_ENET) || defined(SCC_ENET)
#define CONFIG_NET_MULTI
#endif
#endif
#include <asm/byteorder.h>	/* for nton* / ntoh* stuff */


/*
 *	The number of receive packet buffers, and the required packet buffer
 *	alignment in memory.
 *
 */

#ifndef	CONFIG_EEPRO100
#define PKTBUFSRX	4
#else
#define PKTBUFSRX	8
#endif

#define PKTALIGN	32

typedef ulong		IPaddr_t;


/*
 * The current receive packet handler.  Called with a pointer to the
 * application packet, and a protocol type (PORT_BOOTPC or PORT_TFTP).
 * All other packets are dealt with without calling the handler.
 */
typedef void	rxhand_f(uchar *, unsigned, unsigned, unsigned);

/*
 *	A timeout handler.  Called after time interval has expired.
 */
typedef void	thand_f(void);

#ifdef CONFIG_NET_MULTI

#define NAMESIZE 16

enum eth_state_t {
	ETH_STATE_INIT,
	ETH_STATE_PASSIVE,
	ETH_STATE_ACTIVE
};

struct eth_device {
	char name[NAMESIZE];
	unsigned char enetaddr[6];
	int iobase;
	int state;

	int  (*init) (struct eth_device*, bd_t*);
	int  (*send) (struct eth_device*, volatile void* pachet, int length);
	int  (*recv) (struct eth_device*);
	void (*halt) (struct eth_device*);

	struct eth_device *next;
	void *priv;
};

extern int eth_initialize(bd_t *bis);		/* Initialize network subsystem */
extern int eth_register(struct eth_device* dev);/* Register network device	*/
extern void eth_try_another(int first_restart);	/* Change the device		*/
extern struct eth_device *eth_get_dev(void);	/* get the current device MAC	*/
extern void eth_set_enetaddr(int num, char* a);	/* Set new MAC address		*/
#endif

extern int eth_init(bd_t *bis);			/* Initialize the device	*/
extern int eth_send(volatile void *packet, int length);	   /* Send a packet	*/
extern int eth_rx(void);			/* Check for received packets	*/
extern void eth_halt(void);			/* stop SCC			*/


/**********************************************************************/
/*
 *	Protocol headers.
 */

/*
 *	Ethernet header
 */
typedef struct {
	uchar		et_dest[6];	/* Destination node		*/
	uchar		et_src[6];	/* Source node			*/
	ushort		et_protlen;	/* Protocol or length		*/
	uchar		et_dsap;	/* 802 DSAP			*/
	uchar		et_ssap;	/* 802 SSAP			*/
	uchar		et_ctl;		/* 802 control			*/
	uchar		et_snap1;	/* SNAP				*/
	uchar		et_snap2;
	uchar		et_snap3;
	ushort		et_prot;	/* 802 protocol			*/
} Ethernet_t;

#define ETHER_HDR_SIZE	14		/* Ethernet header size		*/
#define E802_HDR_SIZE	22		/* 802 ethernet header size	*/
#define PROT_IP		0x0800		/* IP protocol			*/
#define PROT_ARP	0x0806		/* IP ARP protocol		*/
#define PROT_RARP	0x8035		/* IP ARP protocol		*/

#define IPPROTO_ICMP	 1	/* Internet Control Message Protocol	*/
#define IPPROTO_UDP	17	/* User Datagram Protocol		*/

/*
 *	Internet Protocol (IP) header.
 */
typedef struct {
	uchar		ip_hl_v;	/* header length and version	*/
	uchar		ip_tos;		/* type of service		*/
	ushort		ip_len;		/* total length			*/
	ushort		ip_id;		/* identification		*/
	ushort		ip_off;		/* fragment offset field	*/
	uchar		ip_ttl;		/* time to live			*/
	uchar		ip_p;		/* protocol			*/
	ushort		ip_sum;		/* checksum			*/
	IPaddr_t	ip_src;		/* Source IP address		*/
	IPaddr_t	ip_dst;		/* Destination IP address	*/
	ushort		udp_src;	/* UDP source port		*/
	ushort		udp_dst;	/* UDP destination port		*/
	ushort		udp_len;	/* Length of UDP packet		*/
	ushort		udp_xsum;	/* Checksum			*/
} IP_t;

#define IP_HDR_SIZE_NO_UDP	(sizeof (IP_t) - 8)
#define IP_HDR_SIZE		(sizeof (IP_t))


/*
 *	Address Resolution Protocol (ARP) header.
 */
typedef struct
{
	ushort		ar_hrd;		/* Format of hardware address	*/
#   define ARP_ETHER	    1		/* Ethernet  hardware address	*/
	ushort		ar_pro;		/* Format of protocol address	*/
	uchar		ar_hln;		/* Length of hardware address	*/
	uchar		ar_pln;		/* Length of protocol address	*/
	ushort		ar_op;		/* Operation			*/
#   define ARPOP_REQUEST    1		/* Request  to resolve  address	*/
#   define ARPOP_REPLY	    2		/* Response to previous request	*/

#   define RARPOP_REQUEST   3		/* Request  to resolve  address	*/
#   define RARPOP_REPLY	    4		/* Response to previous request */

	/*
         * The remaining fields are variable in size, according to
         * the sizes above, and are defined as appropriate for
         * specific hardware/protocol combinations.
	 */
	uchar		ar_data[0];
#if 0
	uchar		ar_sha[];	/* Sender hardware address	*/
	uchar		ar_spa[];	/* Sender protocol address	*/
	uchar		ar_tha[];	/* Target hardware address	*/
	uchar		ar_tpa[];	/* Target protocol address	*/
#endif /* 0 */
} ARP_t;

#define ARP_HDR_SIZE	(8+20)		/* Size assuming ethernet	*/

/*
 * ICMP stuff (just enough to handle (host) redirect messages)
 */
#define ICMP_REDIRECT		5	/* Redirect (change route)	*/

/* Codes for REDIRECT. */
#define ICMP_REDIR_NET		0	/* Redirect Net			*/
#define ICMP_REDIR_HOST		1	/* Redirect Host		*/

typedef struct icmphdr {
	uchar		type;
	uchar		code;
	ushort		checksum;
	union {
		struct {
			ushort	id;
			ushort	sequence;
		} echo;
		ulong	gateway;
		struct {
			ushort	__unused;
			ushort	mtu;
		} frag;
	} un;
} ICMP_t;


/*
 * Maximum packet size; used to allocate packet storage.
 * TFTP packets can be 524 bytes + IP header + ethernet header.
 * Lets be conservative, and go for 38 * 16.  (Must also be
 * a multiple of 32 bytes).
 */
/*
 * AS.HARNOIS : Better to set PKTSIZE to maximum size because
 * traffic type is not always controlled
 * maximum packet size =  1518
 * maximum packet size and multiple of 32 bytes =  1536
 */
#define PKTSIZE			1518
#define PKTSIZE_ALIGN		1536
/*#define PKTSIZE		608*/

/*
 * Maximum receive ring size; that is, the number of packets
 * we can buffer before overflow happens. Basically, this just
 * needs to be enough to prevent a packet being discarded while
 * we are processing the previous one.
 */
#define RINGSZ		4
#define RINGSZ_LOG2	2

/**********************************************************************/
/*
 *	Globals.
 *
 * Note:
 *
 * All variables of type IPaddr_t are stored in NETWORK byte order
 * (big endian).
 */

/* net.c */
/** BOOTP EXTENTIONS **/
extern IPaddr_t		NetOurGatewayIP;	/* Our gateway IP addresse	*/
extern IPaddr_t		NetOurSubnetMask;	/* Our subnet mask (0 = unknown)*/
extern IPaddr_t		NetOurDNSIP;	 /* Our Domain Name Server (0 = unknown)*/
extern char		NetOurNISDomain[32];	/* Our NIS domain		*/
extern char		NetOurHostName[32];	/* Our hostname			*/
extern char		NetOurRootPath[64];	/* Our root path		*/
extern ushort		NetBootFileSize;	/* Our boot file size in blocks	*/
/** END OF BOOTP EXTENTIONS **/
extern ulong		NetBootFileXferSize;	/* size of bootfile in bytes	*/
extern uchar		NetOurEther[6];		/* Our ethernet address		*/
extern uchar		NetServerEther[6];	/* Boot server enet address	*/
extern IPaddr_t		NetOurIP;		/* Our    IP addr (0 = unknown)	*/
extern IPaddr_t		NetServerIP;		/* Server IP addr (0 = unknown)	*/
extern volatile uchar * NetTxPacket;		/* THE transmit packet		*/
extern volatile uchar * NetRxPackets[PKTBUFSRX];/* Receive packets		*/
extern volatile uchar * NetRxPkt;		/* Current receive packet	*/
extern int		NetRxPktLen;		/* Current rx packet length	*/
extern unsigned		NetIPID;		/* IP ID (counting)		*/
extern uchar		NetBcastAddr[6];	/* Ethernet boardcast address	*/

extern int		NetState;		/* Network loop state		*/
#define NETLOOP_CONTINUE	1
#define NETLOOP_RESTART		2
#define NETLOOP_SUCCESS		3
#define NETLOOP_FAIL		4

#ifdef CONFIG_NET_MULTI
extern int		NetRestartWrap;		/* Tried all network devices	*/
#endif

typedef enum { BOOTP, RARP, ARP, TFTP, DHCP } proto_t;

/* from net/net.c */
extern char	BootFile[128];			/* Boot File name		*/

/* Initialize the network adapter */
extern int	NetLoop(proto_t);

/* Shutdown adapters and cleanup */
extern void	NetStop(void);

/* Load failed.	 Start again. */
extern void	NetStartAgain(void);

/* Set ethernet header */
extern void	NetSetEther(volatile uchar *, uchar *, uint);

/* Set IP header */
extern void	NetSetIP(volatile uchar *, IPaddr_t, int, int, int);

/* Checksum */
extern int	NetCksumOk(uchar *, int);	/* Return true if cksum OK	*/
extern uint	NetCksum(uchar *, int);		/* Calculate the checksum	*/

/* Set callbacks */
extern void	NetSetHandler(rxhand_f *);	/* Set RX packet handler	*/
extern void	NetSetTimeout(int, thand_f *);	/* Set timeout handler		*/

/* Transmit "NetTxPacket" */
extern void	NetSendPacket(volatile uchar *, int);

/* Processes a received packet */
extern void	NetReceive(volatile uchar *, int);

/* Print an IP address on the console */
extern void	print_IPaddr (IPaddr_t);

/*
 * The following functions are a bit ugly, but necessary to deal with
 * alignment restrictions on ARM.
 *
 * We're using inline functions, which had the smallest memory
 * footprint in our tests.
 */
/* return IP *in network byteorder* */
static inline IPaddr_t NetReadIP(void *from)
{
	IPaddr_t ip;
	memcpy((void*)&ip, from, sizeof(ip));
	return ip;
}

/* return ulong *in network byteorder* */
static inline ulong NetReadLong(ulong *from)
{
	ulong l;
	memcpy((void*)&l, (void*)from, sizeof(l));
	return l;
}

/* write IP *in network byteorder* */
static inline void NetWriteIP(void *to, IPaddr_t ip)
{
	memcpy(to, (void*)&ip, sizeof(ip));
}

/* copy IP */
static inline void NetCopyIP(void *to, void *from)
{
	memcpy(to, from, sizeof(IPaddr_t));
}

/* copy ulong */
static inline void NetCopyLong(ulong *to, ulong *from)
{
	memcpy((void*)to, (void*)from, sizeof(ulong));
}

/* Convert an IP address to a string */
extern void	ip_to_string (IPaddr_t x, char *s);

/* read an IP address from a environment variable */
extern IPaddr_t getenv_IPaddr (char *);

/* copy a filename (allow for "..." notation, limit length) */
extern void	copy_filename (uchar *dst, uchar *src, int size);

/**********************************************************************/

#endif /* __NET_H__ */
Commit	Line	Data
2d966958 WD	1	/*
	2	* LiMon Monitor (LiMon) - Network.
	3	*
	4	* Copyright 1994 - 2000 Neil Russell.
	5	* (See License)
	6	*
	7	*
	8	* History
	9	* 9/16/00 bor adapted to TQM823L/STK8xxL board, RARP/TFTP boot added
	10	*/
	11
	12	#ifndef __NET_H__
	13	#define __NET_H__
	14
	15	#if !defined(CONFIG_NET_MULTI) && defined(CONFIG_8xx)
	16	#include <commproc.h>
	17	#if defined(FEC_ENET) \|\| defined(SCC_ENET)
	18	#define CONFIG_NET_MULTI
	19	#endif
	20	#endif
	21	#include <asm/byteorder.h> /* for nton* / ntoh* stuff */
	22
	23
	24	/*
	25	* The number of receive packet buffers, and the required packet buffer
	26	* alignment in memory.
	27	*
	28	*/
	29
1d0350ed	30	#ifndef CONFIG_EEPRO100
2d966958	31	#define PKTBUFSRX 4
1d0350ed WD	32	#else
	33	#define PKTBUFSRX 8
	34	#endif
	35
2d966958 WD	36	#define PKTALIGN 32
	37
	38	typedef ulong IPaddr_t;
	39
	40
	41
	42	/*
	43	* The current receive packet handler. Called with a pointer to the
	44	* application packet, and a protocol type (PORT_BOOTPC or PORT_TFTP).
	45	* All other packets are dealt with without calling the handler.
	46	*/
	47	typedef void rxhand_f(uchar *, unsigned, unsigned, unsigned);
	48
	49	/*
	50	* A timeout handler. Called after time interval has expired.
	51	*/
	52	typedef void thand_f(void);
	53
	54	#ifdef CONFIG_NET_MULTI
	55
	56	#define NAMESIZE 16
	57
	58	enum eth_state_t {
	59	ETH_STATE_INIT,
	60	ETH_STATE_PASSIVE,
	61	ETH_STATE_ACTIVE
	62	};
	63
	64	struct eth_device {
	65	char name[NAMESIZE];
	66	unsigned char enetaddr[6];
	67	int iobase;
	68	int state;
	69
	70	int (init) (struct eth_device, bd_t*);
	71	int (send) (struct eth_device, volatile void* pachet, int length);
	72	int (recv) (struct eth_device);
	73	void (halt) (struct eth_device);
	74
	75	struct eth_device *next;
	76	void *priv;
	77	};
	78
	79	extern int eth_initialize(bd_t bis); / Initialize network subsystem */
	80	extern int eth_register(struct eth_device* dev);/* Register network device */
	81	extern void eth_try_another(int first_restart); /* Change the device */
	82	extern struct eth_device eth_get_dev(void); / get the current device MAC */
	83	extern void eth_set_enetaddr(int num, char* a); /* Set new MAC address */
	84	#endif
	85
	86	extern int eth_init(bd_t bis); / Initialize the device */
	87	extern int eth_send(volatile void packet, int length); / Send a packet */
	88	extern int eth_rx(void); /* Check for received packets */
	89	extern void eth_halt(void); /* stop SCC */
	90
	91
	92	/**********************************************************************/
	93	/*
	94	* Protocol headers.
	95	*/
	96
	97	/*
	98	* Ethernet header
	99	*/
100	typedef struct {
101	uchar et_dest[6]; /* Destination node */
102	uchar et_src[6]; /* Source node */
103	ushort et_protlen; /* Protocol or length */
104	uchar et_dsap; /* 802 DSAP */
105	uchar et_ssap; /* 802 SSAP */
106	uchar et_ctl; /* 802 control */
107	uchar et_snap1; /* SNAP */
108	uchar et_snap2;
109	uchar et_snap3;
110	ushort et_prot; /* 802 protocol */
111	} Ethernet_t;
112
113	#define ETHER_HDR_SIZE 14 /* Ethernet header size */
114	#define E802_HDR_SIZE 22 /* 802 ethernet header size */
115	#define PROT_IP 0x0800 /* IP protocol */
116	#define PROT_ARP 0x0806 /* IP ARP protocol */
117	#define PROT_RARP 0x8035 /* IP ARP protocol */
118
119	#define IPPROTO_ICMP 1 /* Internet Control Message Protocol */
120	#define IPPROTO_UDP 17 /* User Datagram Protocol */
121
122	/*
123	* Internet Protocol (IP) header.
124	*/
125	typedef struct {
126	uchar ip_hl_v; /* header length and version */
127	uchar ip_tos; /* type of service */
128	ushort ip_len; /* total length */
129	ushort ip_id; /* identification */
130	ushort ip_off; /* fragment offset field */
131	uchar ip_ttl; /* time to live */
132	uchar ip_p; /* protocol */
133	ushort ip_sum; /* checksum */
134	IPaddr_t ip_src; /* Source IP address */
135	IPaddr_t ip_dst; /* Destination IP address */
136	ushort udp_src; /* UDP source port */
137	ushort udp_dst; /* UDP destination port */
138	ushort udp_len; /* Length of UDP packet */
139	ushort udp_xsum; /* Checksum */
140	} IP_t;
141
142	#define IP_HDR_SIZE_NO_UDP (sizeof (IP_t) - 8)
143	#define IP_HDR_SIZE (sizeof (IP_t))
144
145
146	/*
147	* Address Resolution Protocol (ARP) header.
148	*/
149	typedef struct
150	{
151	ushort ar_hrd; /* Format of hardware address */
152	# define ARP_ETHER 1 /* Ethernet hardware address */
153	ushort ar_pro; /* Format of protocol address */
154	uchar ar_hln; /* Length of hardware address */
155	uchar ar_pln; /* Length of protocol address */
156	ushort ar_op; /* Operation */
157	# define ARPOP_REQUEST 1 /* Request to resolve address */
158	# define ARPOP_REPLY 2 /* Response to previous request */
159
160	# define RARPOP_REQUEST 3 /* Request to resolve address */
161	# define RARPOP_REPLY 4 /* Response to previous request */
162
163	/*
164	* The remaining fields are variable in size, according to
165	* the sizes above, and are defined as appropriate for
166	* specific hardware/protocol combinations.
167	*/
168	uchar ar_data[0];
169	#if 0
170	uchar ar_sha[]; /* Sender hardware address */
171	uchar ar_spa[]; /* Sender protocol address */
172	uchar ar_tha[]; /* Target hardware address */
173	uchar ar_tpa[]; /* Target protocol address */
174	#endif /* 0 */
175	} ARP_t;
176
177	#define ARP_HDR_SIZE (8+20) /* Size assuming ethernet */
178
179	/*
180	* ICMP stuff (just enough to handle (host) redirect messages)
181	*/
182	#define ICMP_REDIRECT 5 /* Redirect (change route) */
183
184	/* Codes for REDIRECT. */
185	#define ICMP_REDIR_NET 0 /* Redirect Net */
186	#define ICMP_REDIR_HOST 1 /* Redirect Host */
187
188	typedef struct icmphdr {
189	uchar type;
190	uchar code;
191	ushort checksum;
192	union {
193	struct {
194	ushort id;
195	ushort sequence;
196	} echo;
197	ulong gateway;
198	struct {
199	ushort __unused;
200	ushort mtu;
201	} frag;
202	} un;
203	} ICMP_t;
204
205
206
207	/*
208	* Maximum packet size; used to allocate packet storage.
209	* TFTP packets can be 524 bytes + IP header + ethernet header.
210	* Lets be conservative, and go for 38 * 16. (Must also be
211	* a multiple of 32 bytes).
212	*/
213	/*
214	* AS.HARNOIS : Better to set PKTSIZE to maximum size because
215	* traffic type is not always controlled
216	* maximum packet size = 1518
217	* maximum packet size and multiple of 32 bytes = 1536
218	*/
219	#define PKTSIZE 1518
220	#define PKTSIZE_ALIGN 1536
221	/#define PKTSIZE 608/
222
223	/*
224	* Maximum receive ring size; that is, the number of packets
225	* we can buffer before overflow happens. Basically, this just
226	* needs to be enough to prevent a packet being discarded while
227	* we are processing the previous one.
228	*/
229	#define RINGSZ 4
230	#define RINGSZ_LOG2 2
231
232	/**********************************************************************/
233	/*
234	* Globals.
235	*
236	* Note:
237	*
238	* All variables of type IPaddr_t are stored in NETWORK byte order
239	* (big endian).
240	*/
241
242	/* net.c */
243	/ BOOTP EXTENTIONS /
244	extern IPaddr_t NetOurGatewayIP; /* Our gateway IP addresse */
245	extern IPaddr_t NetOurSubnetMask; /* Our subnet mask (0 = unknown)*/
246	extern IPaddr_t NetOurDNSIP; /* Our Domain Name Server (0 = unknown)*/
247	extern char NetOurNISDomain[32]; /* Our NIS domain */
248	extern char NetOurHostName[32]; /* Our hostname */
249	extern char NetOurRootPath[64]; /* Our root path */
250	extern ushort NetBootFileSize; /* Our boot file size in blocks */
251	/ END OF BOOTP EXTENTIONS /
252	extern ulong NetBootFileXferSize; /* size of bootfile in bytes */
253	extern uchar NetOurEther[6]; /* Our ethernet address */
254	extern uchar NetServerEther[6]; /* Boot server enet address */
255	extern IPaddr_t NetOurIP; /* Our IP addr (0 = unknown) */
256	extern IPaddr_t NetServerIP; /* Server IP addr (0 = unknown) */
257	extern volatile uchar * NetTxPacket; /* THE transmit packet */
258	extern volatile uchar * NetRxPackets[PKTBUFSRX];/* Receive packets */
259	extern volatile uchar * NetRxPkt; /* Current receive packet */
260	extern int NetRxPktLen; /* Current rx packet length */
261	extern unsigned NetIPID; /* IP ID (counting) */
262	extern uchar NetBcastAddr[6]; /* Ethernet boardcast address */
263
264	extern int NetState; /* Network loop state */
265	#define NETLOOP_CONTINUE 1
266	#define NETLOOP_RESTART 2
267	#define NETLOOP_SUCCESS 3
268	#define NETLOOP_FAIL 4
269
270	#ifdef CONFIG_NET_MULTI
271	extern int NetRestartWrap; /* Tried all network devices */
272	#endif
273
274	typedef enum { BOOTP, RARP, ARP, TFTP, DHCP } proto_t;
275
276	/* from net/net.c */
277	extern char BootFile[128]; /* Boot File name */
278
279	/* Initialize the network adapter */
280	extern int NetLoop(proto_t);
281
282	/* Shutdown adapters and cleanup */
283	extern void NetStop(void);
284
285	/* Load failed. Start again. */
286	extern void NetStartAgain(void);
287
288	/* Set ethernet header */
289	extern void NetSetEther(volatile uchar , uchar , uint);
290
291	/* Set IP header */
292	extern void NetSetIP(volatile uchar *, IPaddr_t, int, int, int);
293
294	/* Checksum */
295	extern int NetCksumOk(uchar , int); / Return true if cksum OK */
296	extern uint NetCksum(uchar , int); / Calculate the checksum */
297
298	/* Set callbacks */
299	extern void NetSetHandler(rxhand_f ); / Set RX packet handler */
300	extern void NetSetTimeout(int, thand_f ); / Set timeout handler */
301
302	/* Transmit "NetTxPacket" */
303	extern void NetSendPacket(volatile uchar *, int);
304
305	/* Processes a received packet */
306	extern void NetReceive(volatile uchar *, int);
307
308	/* Print an IP address on the console */
309	extern void print_IPaddr (IPaddr_t);
310
311	/*
312	* The following functions are a bit ugly, but necessary to deal with
313	* alignment restrictions on ARM.
314	*
315	* We're using inline functions, which had the smallest memory
316	* footprint in our tests.
317	*/
318	/* return IP in network byteorder */
319	static inline IPaddr_t NetReadIP(void *from)
320	{
321	IPaddr_t ip;
322	memcpy((void*)&ip, from, sizeof(ip));
323	return ip;
324	}
325
326	/* return ulong in network byteorder */
327	static inline ulong NetReadLong(ulong *from)
328	{
329	ulong l;
330	memcpy((void)&l, (void)from, sizeof(l));
331	return l;
332	}
333
334	/* write IP in network byteorder */
335	static inline void NetWriteIP(void *to, IPaddr_t ip)
336	{
337	memcpy(to, (void*)&ip, sizeof(ip));
338	}
339
340	/* copy IP */
341	static inline void NetCopyIP(void to, void from)
342	{
343	memcpy(to, from, sizeof(IPaddr_t));
344	}
345
346	/* copy ulong */
347	static inline void NetCopyLong(ulong to, ulong from)
348	{
349	memcpy((void)to, (void)from, sizeof(ulong));
350	}
351
352	/* Convert an IP address to a string */
353	extern void ip_to_string (IPaddr_t x, char *s);
354
355	/* read an IP address from a environment variable */
356	extern IPaddr_t getenv_IPaddr (char *);
357
358	/* copy a filename (allow for "..." notation, limit length) */
359	extern void copy_filename (uchar dst, uchar src, int size);
360
361	/**********************************************************************/
362
363	#endif /* __NET_H__ */