summaryrefslogtreecommitdiff
path: root/include/net.h
blob: 8dd407e6cfe132008f7baf948d38ac02203c37a6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
/*
 *	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_8xx)
#include <commproc.h>
#endif	/* CONFIG_8xx */

#include <asm/cache.h>
#include <asm/byteorder.h>	/* for nton* / ntoh* stuff */


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

#ifdef CONFIG_SYS_RX_ETH_BUFFER
# define PKTBUFSRX	CONFIG_SYS_RX_ETH_BUFFER
#else
# define PKTBUFSRX	4
#endif

#define PKTALIGN	ARCH_DMA_MINALIGN

/* IPv4 addresses are always 32 bits in size */
typedef u32		IPaddr_t;


/**
 * An incoming packet handler.
 * @param pkt    pointer to the application packet
 * @param dport  destination UDP port
 * @param sip    source IP address
 * @param sport  source UDP port
 * @param len    packet length
 */
typedef void rxhand_f(uchar *pkt, unsigned dport,
		      IPaddr_t sip, unsigned sport,
		      unsigned len);

/**
 * An incoming ICMP packet handler.
 * @param type	ICMP type
 * @param code	ICMP code
 * @param dport	destination UDP port
 * @param sip	source IP address
 * @param sport	source UDP port
 * @param pkt	pointer to the ICMP packet data
 * @param len	packet length
 */
typedef void rxhand_icmp_f(unsigned type, unsigned code, unsigned dport,
		IPaddr_t sip, unsigned sport, uchar *pkt, unsigned len);

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

enum eth_state_t {
	ETH_STATE_INIT,
	ETH_STATE_PASSIVE,
	ETH_STATE_ACTIVE
};

struct eth_device {
	char name[16];
	unsigned char enetaddr[6];
	int iobase;
	int state;

	int  (*init) (struct eth_device *, bd_t *);
	int  (*send) (struct eth_device *, void *packet, int length);
	int  (*recv) (struct eth_device *);
	void (*halt) (struct eth_device *);
#ifdef CONFIG_MCAST_TFTP
	int (*mcast) (struct eth_device *, u32 ip, u8 set);
#endif
	int  (*write_hwaddr) (struct eth_device *);
	struct eth_device *next;
	int index;
	void *priv;
};

extern int eth_initialize(bd_t *bis);	/* Initialize network subsystem */
extern int eth_register(struct eth_device* dev);/* Register network device */
extern int eth_unregister(struct eth_device *dev);/* Remove network device */
extern void eth_try_another(int first_restart);	/* Change the device */
extern void eth_set_current(void);		/* set nterface to ethcur var */
extern struct eth_device *eth_get_dev(void);	/* get the current device MAC */
extern struct eth_device *eth_get_dev_by_name(const char *devname);
extern struct eth_device *eth_get_dev_by_index(int index); /* get dev @ index */
extern int eth_get_dev_index(void);		/* get the device index */
extern void eth_parse_enetaddr(const char *addr, uchar *enetaddr);
extern int eth_getenv_enetaddr(char *name, uchar *enetaddr);
extern int eth_setenv_enetaddr(char *name, const uchar *enetaddr);

/*
 * Get the hardware address for an ethernet interface .
 * Args:
 *	base_name - base name for device (normally "eth")
 *	index - device index number (0 for first)
 *	enetaddr - returns 6 byte hardware address
 * Returns:
 *	Return true if the address is valid.
 */
extern int eth_getenv_enetaddr_by_index(const char *base_name, int index,
					uchar *enetaddr);

extern int usb_eth_initialize(bd_t *bi);
extern int eth_init(bd_t *bis);			/* Initialize the device */
extern int eth_send(void *packet, int length);	   /* Send a packet */

#ifdef CONFIG_API
extern int eth_receive(void *packet, int length); /* Receive a packet*/
extern void (*push_packet)(void *packet, int length);
#endif
extern int eth_rx(void);			/* Check for received packets */
extern void eth_halt(void);			/* stop SCC */
extern char *eth_get_name(void);		/* get name of current device */

/*
 * Set the hardware address for an ethernet interface based on 'eth%daddr'
 * environment variable (or just 'ethaddr' if eth_number is 0).
 * Args:
 *	base_name - base name for device (normally "eth")
 *	eth_number - value of %d (0 for first device of this type)
 * Returns:
 *	0 is success, non-zero is error status from driver.
 */
int eth_write_hwaddr(struct eth_device *dev, const char *base_name,
		     int eth_number);

#ifdef CONFIG_MCAST_TFTP
int eth_mcast_join(IPaddr_t mcast_addr, u8 join);
u32 ether_crc(size_t len, unsigned char const *p);
#endif


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

/*
 *	Ethernet header
 */

struct ethernet_hdr {
	uchar		et_dest[6];	/* Destination node		*/
	uchar		et_src[6];	/* Source node			*/
	ushort		et_protlen;	/* Protocol or length		*/
};

/* Ethernet header size */
#define ETHER_HDR_SIZE	(sizeof(struct ethernet_hdr))

struct e802_hdr {
	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			*/
};

/* 802 + SNAP + ethernet header size */
#define E802_HDR_SIZE	(sizeof(struct e802_hdr))

/*
 *	Virtual LAN Ethernet header
 */
struct vlan_ethernet_hdr {
	uchar		vet_dest[6];	/* Destination node		*/
	uchar		vet_src[6];	/* Source node			*/
	ushort		vet_vlan_type;	/* PROT_VLAN			*/
	ushort		vet_tag;	/* TAG of VLAN			*/
	ushort		vet_type;	/* protocol type		*/
};

/* VLAN Ethernet header size */
#define VLAN_ETHER_HDR_SIZE	(sizeof(struct vlan_ethernet_hdr))

#define PROT_IP		0x0800		/* IP protocol			*/
#define PROT_ARP	0x0806		/* IP ARP protocol		*/
#define PROT_RARP	0x8035		/* IP ARP protocol		*/
#define PROT_VLAN	0x8100		/* IEEE 802.1q protocol		*/

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

/*
 *	Internet Protocol (IP) header.
 */
struct ip_hdr {
	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	*/
};

#define IP_OFFS		0x1fff /* ip offset *= 8 */
#define IP_FLAGS	0xe000 /* first 3 bits */
#define IP_FLAGS_RES	0x8000 /* reserved */
#define IP_FLAGS_DFRAG	0x4000 /* don't fragments */
#define IP_FLAGS_MFRAG	0x2000 /* more fragments */

#define IP_HDR_SIZE		(sizeof(struct ip_hdr))

/*
 *	Internet Protocol (IP) + UDP header.
 */
struct ip_udp_hdr {
	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			*/
};

#define IP_UDP_HDR_SIZE		(sizeof(struct ip_udp_hdr))
#define UDP_HDR_SIZE		(IP_UDP_HDR_SIZE - IP_HDR_SIZE)

/*
 *	Address Resolution Protocol (ARP) header.
 */
struct arp_hdr {
	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	*/
#   define ARP_HLEN	6
	uchar		ar_pln;		/* Length of protocol address	*/
#   define ARP_PLEN	4
	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];
#define ar_sha		ar_data[0]
#define ar_spa		ar_data[ARP_HLEN]
#define ar_tha		ar_data[ARP_HLEN + ARP_PLEN]
#define ar_tpa		ar_data[ARP_HLEN + ARP_PLEN + ARP_HLEN]
#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 */
};

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

/*
 * ICMP stuff (just enough to handle (host) redirect messages)
 */
#define ICMP_ECHO_REPLY		0	/* Echo reply			*/
#define ICMP_NOT_REACH		3	/* Detination unreachable	*/
#define ICMP_REDIRECT		5	/* Redirect (change route)	*/
#define ICMP_ECHO_REQUEST	8	/* Echo request			*/

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

/* Codes for NOT_REACH */
#define ICMP_NOT_REACH_PORT	3	/* Port unreachable		*/

struct icmp_hdr {
	uchar		type;
	uchar		code;
	ushort		checksum;
	union {
		struct {
			ushort	id;
			ushort	sequence;
		} echo;
		ulong	gateway;
		struct {
			ushort	__unused;
			ushort	mtu;
		} frag;
		uchar data[0];
	} un;
};

#define ICMP_HDR_SIZE		(sizeof(struct icmp_hdr))
#define IP_ICMP_HDR_SIZE	(IP_HDR_SIZE + ICMP_HDR_SIZE)

/*
 * 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 address */
extern IPaddr_t NetOurSubnetMask;	/* Our subnet mask (0 = unknown) */
extern IPaddr_t NetOurDNSIP;	/* Our Domain Name Server (0 = unknown) */
#if defined(CONFIG_BOOTP_DNS2)
extern IPaddr_t NetOurDNS2IP;	/* Our 2nd Domain Name Server (0 = unknown) */
#endif
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 uchar		*NetTxPacket;		/* THE transmit packet */
extern uchar		*NetRxPackets[PKTBUFSRX]; /* Receive packets */
extern uchar		*NetRxPacket;		/* Current receive packet */
extern int		NetRxPacketLen;		/* Current rx packet length */
extern unsigned		NetIPID;		/* IP ID (counting) */
extern uchar		NetBcastAddr[6];	/* Ethernet boardcast address */
extern uchar		NetEtherNullAddr[6];

#define VLAN_NONE	4095			/* untagged */
#define VLAN_IDMASK	0x0fff			/* mask of valid vlan id */
extern ushort		NetOurVLAN;		/* Our VLAN */
extern ushort		NetOurNativeVLAN;	/* Our Native VLAN */

extern int		NetRestartWrap;		/* Tried all network devices */

enum proto_t {
	BOOTP, RARP, ARP, TFTPGET, DHCP, PING, DNS, NFS, CDP, NETCONS, SNTP,
	TFTPSRV, TFTPPUT
};

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

#if defined(CONFIG_CMD_DNS)
extern char *NetDNSResolve;		/* The host to resolve  */
extern char *NetDNSenvvar;		/* the env var to put the ip into */
#endif

#if defined(CONFIG_CMD_PING)
extern IPaddr_t	NetPingIP;			/* the ip address to ping */
#endif

#if defined(CONFIG_CMD_CDP)
/* when CDP completes these hold the return values */
extern ushort CDPNativeVLAN;		/* CDP returned native VLAN */
extern ushort CDPApplianceVLAN;		/* CDP returned appliance VLAN */

/*
 * Check for a CDP packet by examining the received MAC address field
 */
static inline int is_cdp_packet(const uchar *et_addr)
{
	extern const uchar NetCDPAddr[6];

	return memcmp(et_addr, NetCDPAddr, 6) == 0;
}
#endif

#if defined(CONFIG_CMD_SNTP)
extern IPaddr_t	NetNtpServerIP;			/* the ip address to NTP */
extern int NetTimeOffset;			/* offset time from UTC */
#endif

#if defined(CONFIG_MCAST_TFTP)
extern IPaddr_t Mcast_addr;
#endif

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

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

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

/* Get size of the ethernet header when we send */
extern int	NetEthHdrSize(void);

/* Set ethernet header; returns the size of the header */
extern int NetSetEther(uchar *, uchar *, uint);

/* Set IP header */
extern void net_set_ip_header(uchar *pkt, IPaddr_t dest, IPaddr_t source);
extern void net_set_udp_header(uchar *pkt, IPaddr_t dest, int dport,
				int sport, int len);

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

/* Callbacks */
extern rxhand_f *NetGetHandler(void);		/* Get RX packet handler */
extern void	NetSetHandler(rxhand_f *);	/* Set RX packet handler */
extern void net_set_icmp_handler(rxhand_icmp_f *f); /* Set ICMP RX handler */
extern void	NetSetTimeout(ulong, thand_f *);/* Set timeout handler */

/* Network loop state */
enum net_loop_state {
	NETLOOP_CONTINUE,
	NETLOOP_RESTART,
	NETLOOP_SUCCESS,
	NETLOOP_FAIL
};
static inline void net_set_state(enum net_loop_state state)
{
	extern enum net_loop_state net_state;

	net_state = state;
}

/* Transmit "NetTxPacket" */
static inline void NetSendPacket(uchar *pkt, int len)
{
	(void) eth_send(pkt, len);
}

/*
 * Transmit UDP packet, performing ARP request if needed
 *
 * @param ether Raw packet buffer
 * @param dest IP address to send the datagram to
 * @param dport Destination UDP port
 * @param sport Source UDP port
 * @param payload_len Length of data after the UDP header
 */
extern int	NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport,
			int sport, int payload_len);

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

#ifdef CONFIG_NETCONSOLE
void NcStart(void);
int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len);
#endif

/*
 * Check if autoload is enabled. If so, use either NFS or TFTP to download
 * the boot file.
 */
void net_auto_load(void);

/*
 * 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, (void *)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((void *)to, from, sizeof(IPaddr_t));
}

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

/**
 * is_zero_ether_addr - Determine if give Ethernet address is all zeros.
 * @addr: Pointer to a six-byte array containing the Ethernet address
 *
 * Return true if the address is all zeroes.
 */
static inline int is_zero_ether_addr(const u8 *addr)
{
	return !(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]);
}

/**
 * is_multicast_ether_addr - Determine if the Ethernet address is a multicast.
 * @addr: Pointer to a six-byte array containing the Ethernet address
 *
 * Return true if the address is a multicast address.
 * By definition the broadcast address is also a multicast address.
 */
static inline int is_multicast_ether_addr(const u8 *addr)
{
	return 0x01 & addr[0];
}

/*
 * is_broadcast_ether_addr - Determine if the Ethernet address is broadcast
 * @addr: Pointer to a six-byte array containing the Ethernet address
 *
 * Return true if the address is the broadcast address.
 */
static inline int is_broadcast_ether_addr(const u8 *addr)
{
	return (addr[0] & addr[1] & addr[2] & addr[3] & addr[4] & addr[5]) ==
		0xff;
}

/*
 * is_valid_ether_addr - Determine if the given Ethernet address is valid
 * @addr: Pointer to a six-byte array containing the Ethernet address
 *
 * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not
 * a multicast address, and is not FF:FF:FF:FF:FF:FF.
 *
 * Return true if the address is valid.
 */
static inline int is_valid_ether_addr(const u8 *addr)
{
	/* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to
	 * explicitly check for it here. */
	return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr);
}

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

/* Convert a string to ip address */
extern IPaddr_t string_to_ip(const char *s);

/* Convert a VLAN id to a string */
extern void VLAN_to_string(ushort x, char *s);

/* Convert a string to a vlan id */
extern ushort string_to_VLAN(const char *s);

/* read a VLAN id from an environment variable */
extern ushort getenv_VLAN(char *);

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

/* get a random source port */
extern unsigned int random_port(void);

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

#endif /* __NET_H__ */