/*
   *	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 */

  #define DEBUG_LL_STATE 0	/* Link local state machine changes */
  #define DEBUG_DEV_PKT 0		/* Packets or info directed to the device */
  #define DEBUG_NET_PKT 0		/* Packets on info on the network at large */
  #define DEBUG_INT_STATE 0	/* Internal network state changes */

  
  /*
   *	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 __be32		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 *, const u8 *enetaddr, 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 */

  /* get the current device MAC */

  extern struct eth_device *eth_current;

  static inline __attribute__((always_inline))
  struct eth_device *eth_get_dev(void)
  {

  	return eth_current;
  }

  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);

  #ifdef CONFIG_RANDOM_MACADDR
  /*
   * The u-boot policy does not allow hardcoded ethernet addresses. Under the
   * following circumstances a random generated address is allowed:
   *  - in emergency cases, where you need a working network connection to set
   *    the ethernet address.
   *    Eg. you want a rescue boot and don't have a serial port to access the
   *    CLI to set environment variables.
   *
   * In these cases, we generate a random locally administered ethernet address.
   *
   * Args:
   *  enetaddr - returns 6 byte hardware address
   */
  extern void eth_random_enetaddr(uchar *enetaddr);
  #endif

  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 active state */
  static inline __attribute__((always_inline)) int eth_init_state_only(bd_t *bis)
  {
  	eth_get_dev()->state = ETH_STATE_ACTIVE;
  
  	return 0;
  }
  /* Set passive state */
  static inline __attribute__((always_inline)) void eth_halt_state_only(void)
  {
  	eth_get_dev()->state = ETH_STATE_PASSIVE;
  }

  /*
   * 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, LINKLOCAL

  };

  
  /* 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 void net_init(void);

  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);

  extern int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot);

  
  /* 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 *net_get_udp_handler(void);	/* Get UDP RX packet handler */
  extern void net_set_udp_handler(rxhand_f *);	/* Set UDP RX packet handler */
  extern rxhand_f *net_get_arp_handler(void);	/* Get ARP RX packet handler */
  extern void net_set_arp_handler(rxhand_f *);	/* Set ARP 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
  };

  extern enum net_loop_state net_state;

  static inline void net_set_state(enum net_loop_state state)
  {

  	debug_cond(DEBUG_INT_STATE, "--- NetState set to %d
  ", state);

  	net_state = state;
  }

  /* Transmit a packet */

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

  /*

   * Transmit "NetTxPacket" as UDP packet, performing ARP request if needed

   *  (ether will be populated)

   *
   * @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, IPaddr_t src_ip, unsigned dest_port,
  	unsigned src_port, unsigned len);

  #endif

  static inline __attribute__((always_inline)) int eth_is_on_demand_init(void)
  {
  #ifdef CONFIG_NETCONSOLE
  	extern enum proto_t net_loop_last_protocol;
  
  	return net_loop_last_protocol != NETCONS;
  #else
  	return 1;
  #endif
  }
  
  static inline void eth_set_last_protocol(int protocol)
  {
  #ifdef CONFIG_NETCONSOLE
  	extern enum proto_t net_loop_last_protocol;
  
  	net_loop_last_protocol = protocol;
  #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);

  /* Update U-Boot over TFTP */
  extern int update_tftp(ulong addr);

  /**********************************************************************/
  
  #endif /* __NET_H__ */