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/*
 *	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_CMD_NET)

DECLARE_GLOBAL_DATA_PTR;

#define ARP_TIMEOUT		5		/* Seconds before trying ARP again */
#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;		/* Our IP addr (0 = unknown)		*/
volatile uchar *NetRxPkt;		/* Current receive packet		*/
int		NetRxPktLen;		/* 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 };
#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);

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

IPaddr_t	NetArpWaitPacketIP;
IPaddr_t	NetArpWaitReplyIP;
uchar	       *NetArpWaitPacketMAC;	/* MAC address of waiting packet's destination	*/
uchar	       *NetArpWaitTxPacket;	/* THE transmit packet			*/
int		NetArpWaitTxPacketSize;
uchar 		NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
ulong		NetArpWaitTimerStart;
int		NetArpWaitTry;

void ArpRequest (void)
{
	int i;
	volatile uchar *pkt;
	ARP_t *arp;

#ifdef ET_DEBUG
	printf ("ARP broadcast %d\n", NetArpWaitTry);
#endif
	pkt = NetTxPacket;

	pkt += NetSetEther (pkt, NetBcastAddr, PROT_ARP);

	arp = (ARP_t *) pkt;

	arp->ar_hrd = htons (ARP_ETHER);
	arp->ar_pro = htons (PROT_IP);
	arp->ar_hln = 6;
	arp->ar_pln = 4;
	arp->ar_op = htons (ARPOP_REQUEST);

	memcpy (&arp->ar_data[0], NetOurEther, 6);		/* source ET addr	*/
	NetWriteIP ((uchar *) & arp->ar_data[6], NetOurIP);	/* source IP addr	*/
	for (i = 10; i < 16; ++i) {
		arp->ar_data[i] = 0;				/* dest ET addr = 0     */
	}

	if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
	    (NetOurIP & NetOurSubnetMask)) {
		if (NetOurGatewayIP == 0) {
			puts ("## Warning: gatewayip needed but not set\n");
			NetArpWaitReplyIP = NetArpWaitPacketIP;
		} else {
			NetArpWaitReplyIP = NetOurGatewayIP;
		}
	} else {
		NetArpWaitReplyIP = NetArpWaitPacketIP;
	}

	NetWriteIP ((uchar *) & arp->ar_data[16], NetArpWaitReplyIP);
	(void) eth_send (NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
}

void ArpTimeoutCheck(void)
{
	ulong t;

	if (!NetArpWaitPacketIP)
		return;

	t = get_timer(0);

	/* check for arp timeout */
	if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT * CFG_HZ) {
		NetArpWaitTry++;

		if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
			puts ("\nARP Retry count exceeded; starting again\n");
			NetArpWaitTry = 0;
			NetStartAgain();
		} else {
			NetArpWaitTimerStart = t;
			ArpRequest();
		}
	}
}

/**********************************************************************/
/*
 *	Main network processing loop.
 */

int
NetLoop(proto_t protocol)
{
	bd_t *bd = gd->bd;

#ifdef CONFIG_NET_MULTI
	NetRestarted = 0;
	NetDevExists = 0;
#endif

	/* XXX problem with bss workaround */
	NetArpWaitPacketMAC = NULL;
	NetArpWaitTxPacket = NULL;
	NetArpWaitPacketIP = 0;
	NetArpWaitReplyIP = 0;
	NetArpWaitTxPacket = NULL;
	NetTxPacket = NULL;

	if (!NetTxPacket) {
		int	i;
		/*
		 *	Setup packet buffers, aligned correctly.
		 */
		NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
		NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
		for (i = 0; i < PKTBUFSRX; i++) {
			NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
		}
	}

	if (!NetArpWaitTxPacket) {
		NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
		NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
		NetArpWaitTxPacketSize = 0;
	}

	eth_halt();
#ifdef CONFIG_NET_MULTI
	eth_set_current();
#endif
	if (eth_init(bd) < 0) {
		eth_halt();
		return(-1);
	}

restart:
#ifdef CONFIG_NET_MULTI
	memcpy (NetOurEther, eth_get_dev()->enetaddr, 6);
#else
	memcpy (NetOurEther, bd->bi_enetaddr, 6);
#endif

	NetState = NETLOOP_CONTINUE;

	/*
	 *	Start the ball rolling with the given start function.  From
	 *	here on, this code is a state machine driven by received
	 *	packets and timer events.
	 */

	switch (protocol) {
#if defined(CONFIG_CMD_NFS)
	case NFS:
#endif
#if defined(CONFIG_CMD_PING)
	case PING:
#endif
#if defined(CONFIG_CMD_SNTP)
	case SNTP:
#endif
	case NETCONS:
	case TFTP:
		NetCopyIP(&NetOurIP, &bd->bi_ip_addr);
		NetOurGatewayIP = getenv_IPaddr ("gatewayip");
		NetOurSubnetMask= getenv_IPaddr ("netmask");
		NetOurVLAN = getenv_VLAN("vlan");
		NetOurNativeVLAN = getenv_VLAN("nvlan");

		switch (protocol) {
#if defined(CONFIG_CMD_NFS)
		case NFS:
#endif
		case NETCONS:
		case TFTP:
			NetServerIP = getenv_IPaddr ("serverip");
			break;
#if defined(CONFIG_CMD_PING)
		case PING:
			/* nothing */
			break;
#endif
#if defined(CONFIG_CMD_SNTP)
		case SNTP:
			/* nothing */
			break;
#endif
		default:
			break;
		}

		break;
	case BOOTP:
	case RARP:
		/*
		 * initialize our IP addr to 0 in order to accept ANY
		 * IP addr assigned to us by the BOOTP / RARP server
		 */
		NetOurIP = 0;
		NetServerIP = getenv_IPaddr ("serverip");
		NetOurVLAN = getenv_VLAN("vlan");	/* VLANs must be read */
		NetOurNativeVLAN = getenv_VLAN("nvlan");
	case CDP: