net.c

/*
 *	Copied from Linux Monitor (LiMon) - Networking.
 *
 *	Copyright 1994 - 2000 Neil Russell.
 *	(See License)
 *	Copyright 2000 Roland Borde
 *	Copyright 2000 Paolo Scaffardi
 *	Copyright 2000-2002 Wolfgang Denk, wd@denx.de
 */

/*
 * General Desription:
 *
 * The user interface supports commands for BOOTP, RARP, and TFTP.
 * Also, we support ARP internally. Depending on available data,
 * these interact as follows:
 *
 * BOOTP:
 *
 *	Prerequisites:	- own ethernet address
 *	We want:	- own IP address
 *			- TFTP server IP address
 *			- name of bootfile
 *	Next step:	ARP
 *
 * RARP:
 *
 *	Prerequisites:	- own ethernet address
 *	We want:	- own IP address
 *			- TFTP server IP address
 *	Next step:	ARP
 *
 * ARP:
 *
 *	Prerequisites:	- own ethernet address
 *			- own IP address
 *			- TFTP server IP address
 *	We want:	- TFTP server ethernet address
 *	Next step:	TFTP
 *
 * DHCP:
 *
 *     Prerequisites:	- own ethernet address
 *     We want:		- IP, Netmask, ServerIP, Gateway IP
 *			- bootfilename, lease time
 *     Next step:	- TFTP
 *
 * TFTP:
 *
 *	Prerequisites:	- own ethernet address
 *			- own IP address
 *			- TFTP server IP address
 *			- TFTP server ethernet address
 *			- name of bootfile (if unknown, we use a default name
 *			  derived from our own IP address)
 *	We want:	- load the boot file
 *	Next step:	none
 *
 * NFS:
 *
 *	Prerequisites:	- own ethernet address
 *			- own IP address
 *			- name of bootfile (if unknown, we use a default name
 *			  derived from our own IP address)
 *	We want:	- load the boot file
 *	Next step:	none
 *
 * SNTP:
 *
 *	Prerequisites:	- own ethernet address
 *			- own IP address
 *	We want:	- network time
 *	Next step:	none
 */


#include <common.h>
#include <watchdog.h>
#include <command.h>
#include <net.h>
#include "bootp.h"
#include "tftp.h"
#include "rarp.h"
#include "nfs.h"
#ifdef CONFIG_STATUS_LED
#include <status_led.h>
#include <miiphy.h>
#endif
#if defined(CONFIG_CMD_SNTP)
#include "sntp.h"
#endif
#if defined(CONFIG_CDP_VERSION)
#include <timestamp.h>
#endif

#if defined(CONFIG_CMD_NET)

DECLARE_GLOBAL_DATA_PTR;

#ifndef	CONFIG_ARP_TIMEOUT
# define ARP_TIMEOUT		5000UL	/* Milliseconds before trying ARP again */
#else
# define ARP_TIMEOUT		CONFIG_ARP_TIMEOUT
#endif


#ifndef	CONFIG_NET_RETRY_COUNT
# define ARP_TIMEOUT_COUNT	5	/* # of timeouts before giving up  */
#else
# define ARP_TIMEOUT_COUNT	CONFIG_NET_RETRY_COUNT
#endif

#if 0
#define ET_DEBUG
#endif

/** BOOTP EXTENTIONS **/

IPaddr_t	NetOurSubnetMask=0;		/* Our subnet mask (0=unknown)	*/
IPaddr_t	NetOurGatewayIP=0;		/* Our gateways IP address	*/
IPaddr_t	NetOurDNSIP=0;			/* Our DNS IP address		*/
#if defined(CONFIG_BOOTP_DNS2)
IPaddr_t	NetOurDNS2IP=0;			/* Our 2nd DNS IP address	*/
#endif
char		NetOurNISDomain[32]={0,};	/* Our NIS domain		*/
char		NetOurHostName[32]={0,};	/* Our hostname			*/
char		NetOurRootPath[64]={0,};	/* Our bootpath			*/
ushort		NetBootFileSize=0;		/* Our bootfile size in blocks	*/

#ifdef CONFIG_MCAST_TFTP	/* Multicast TFTP */
IPaddr_t Mcast_addr;
#endif

/** END OF BOOTP EXTENTIONS **/

ulong		NetBootFileXferSize;	/* The actual transferred size of the bootfile (in bytes) */
uchar		NetOurEther[6];		/* Our ethernet address			*/
uchar		NetServerEther[6] =	/* Boot server enet address		*/
			{ 0, 0, 0, 0, 0, 0 };
IPaddr_t	NetOurIP;		/* Our IP addr (0 = unknown)		*/
IPaddr_t	NetServerIP;		/* Server IP addr (0 = unknown)		*/
volatile uchar *NetRxPacket;		/* Current receive packet		*/
int		NetRxPacketLen;		/* Current rx packet length		*/
unsigned	NetIPID;		/* IP packet ID				*/
uchar		NetBcastAddr[6] =	/* Ethernet bcast address		*/
			{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
uchar		NetEtherNullAddr[6] =
			{ 0, 0, 0, 0, 0, 0 };
#ifdef CONFIG_API
void		(*push_packet)(volatile void *, int len) = 0;
#endif
#if defined(CONFIG_CMD_CDP)
uchar		NetCDPAddr[6] =		/* Ethernet bcast address		*/
			{ 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc };
#endif
int		NetState;		/* Network loop state			*/
#ifdef CONFIG_NET_MULTI
int		NetRestartWrap = 0;	/* Tried all network devices		*/
static int	NetRestarted = 0;	/* Network loop restarted		*/
static int	NetDevExists = 0;	/* At least one device configured	*/
#endif

/* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
ushort		NetOurVLAN = 0xFFFF;		/* default is without VLAN	*/
ushort		NetOurNativeVLAN = 0xFFFF;	/* ditto			*/

char		BootFile[128];		/* Boot File name			*/

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

static void PingStart(void);
#endif

#if defined(CONFIG_CMD_CDP)
static void CDPStart(void);
#endif

#if defined(CONFIG_CMD_SNTP)
IPaddr_t	NetNtpServerIP;		/* NTP server IP address		*/
int		NetTimeOffset=0;	/* offset time from UTC			*/
#endif

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

volatile uchar	PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];

volatile uchar *NetRxPackets[PKTBUFSRX]; /* Receive packets			*/

static rxhand_f *packetHandler;		/* Current RX packet handler		*/
static thand_f *timeHandler;		/* Current timeout handler		*/
static ulong	timeStart;		/* Time base value			*/
static ulong	timeDelta;		/* Current timeout value		*/
volatile uchar *NetTxPacket = 0;	/* THE transmit packet			*/

static int net_check_prereq (proto_t protocol);