net.c

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	NetSetHandler (startAgainHandler);
#else	/* !CONFIG_NET_MULTI*/
	eth_halt ();
	eth_try_another (!NetRestarted);
	eth_init (gd->bd);
	if (NetRestartWrap) {
		NetRestartWrap = 0;
		if (NetDevExists && !once) {
			NetSetTimeout (10 * CFG_HZ, startAgainTimeout);
			NetSetHandler (startAgainHandler);
		} else {
			NetState = NETLOOP_FAIL;
		}
	} else {
		NetState = NETLOOP_RESTART;
	}
#endif	/* CONFIG_NET_MULTI */
}

/**********************************************************************/
/*
 *	Miscelaneous bits.
 */

void
NetSetHandler(rxhand_f * f)
{
	packetHandler = f;
}


void
NetSetTimeout(ulong iv, thand_f * f)
{
	if (iv == 0) {
		timeHandler = (thand_f *)0;
	} else {
		timeHandler = f;
		timeStart = get_timer(0);
		timeDelta = iv;
	}
}


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

int
NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
{
	uchar *pkt;

	/* convert to new style broadcast */
	if (dest == 0)
		dest = 0xFFFFFFFF;

	/* if broadcast, make the ether address a broadcast and don't do ARP */
	if (dest == 0xFFFFFFFF)
		ether = NetBcastAddr;

	/* if MAC address was not discovered yet, save the packet and do an ARP request */
	if (memcmp(ether, NetEtherNullAddr, 6) == 0) {

#ifdef ET_DEBUG
		printf("sending ARP for %08lx\n", dest);
#endif
		NetArpWaitPacketIP = dest;
		NetArpWaitPacketMAC = ether;

		pkt = NetArpWaitTxPacket;
		pkt += NetSetEther (pkt, NetArpWaitPacketMAC, PROT_IP);

		NetSetIP (pkt, dest, dport, sport, len);
		memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len);

		/* size of the waiting packet */
		NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE + len;

		/* and do the ARP request */
		NetArpWaitTry = 1;
		NetArpWaitTimerStart = get_timer(0);
		ArpRequest();
		return 1;	/* waiting */
	}

#ifdef ET_DEBUG
	printf("sending UDP to %08lx/%02x:%02x:%02x:%02x:%02x:%02x\n",
		dest, ether[0], ether[1], ether[2], ether[3], ether[4], ether[5]);
#endif

	pkt = (uchar *)NetTxPacket;
	pkt += NetSetEther (pkt, ether, PROT_IP);
	NetSetIP (pkt, dest, dport, sport, len);
	(void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len);

	return 0;	/* transmitted */
}

#if (CONFIG_COMMANDS & CFG_CMD_PING)
static ushort PingSeqNo;

int PingSend(void)
{
	static uchar mac[6];
	volatile IP_t *ip;
	volatile ushort *s;
	uchar *pkt;

	/* XXX always send arp request */

	memcpy(mac, NetEtherNullAddr, 6);

#ifdef ET_DEBUG
	printf("sending ARP for %08lx\n", NetPingIP);
#endif

	NetArpWaitPacketIP = NetPingIP;
	NetArpWaitPacketMAC = mac;

	pkt = NetArpWaitTxPacket;
	pkt += NetSetEther(pkt, mac, PROT_IP);

	ip = (volatile IP_t *)pkt;

	/*
	 *	Construct an IP and ICMP header.  (need to set no fragment bit - XXX)
	 */
	ip->ip_hl_v  = 0x45;		/* IP_HDR_SIZE / 4 (not including UDP) */
	ip->ip_tos   = 0;
	ip->ip_len   = htons(IP_HDR_SIZE_NO_UDP + 8);
	ip->ip_id    = htons(NetIPID++);
	ip->ip_off   = htons(0x4000);	/* No fragmentation */
	ip->ip_ttl   = 255;
	ip->ip_p     = 0x01;		/* ICMP */
	ip->ip_sum   = 0;
	NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
	NetCopyIP((void*)&ip->ip_dst, &NetPingIP);	   /* - "" - */
	ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);

	s = &ip->udp_src;		/* XXX ICMP starts here */
	s[0] = htons(0x0800);		/* echo-request, code */
	s[1] = 0;			/* checksum */
	s[2] = 0; 			/* identifier */
	s[3] = htons(PingSeqNo++);	/* sequence number */
	s[1] = ~NetCksum((uchar *)s, 8/2);

	/* size of the waiting packet */
	NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8;

	/* and do the ARP request */
	NetArpWaitTry = 1;
	NetArpWaitTimerStart = get_timer(0);
	ArpRequest();
	return 1;	/* waiting */
}

static void
PingTimeout (void)
{
	eth_halt();
	NetState = NETLOOP_FAIL;	/* we did not get the reply */
}

static void
PingHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
{
	IPaddr_t tmp;
	volatile IP_t *ip = (volatile IP_t *)pkt;

	tmp = NetReadIP((void *)&ip->ip_src);
	if (tmp != NetPingIP)
		return;

	NetState = NETLOOP_SUCCESS;
}

static void PingStart(void)
{
#if defined(CONFIG_NET_MULTI)
	printf ("Using %s device\n", eth_get_name());
#endif	/* CONFIG_NET_MULTI */
	NetSetTimeout (10 * CFG_HZ, PingTimeout);
	NetSetHandler (PingHandler);

	PingSend();
}
#endif	/* CFG_CMD_PING */

#if (CONFIG_COMMANDS & CFG_CMD_CDP)

#define CDP_DEVICE_ID_TLV		0x0001
#define CDP_ADDRESS_TLV			0x0002
#define CDP_PORT_ID_TLV			0x0003
#define CDP_CAPABILITIES_TLV		0x0004
#define CDP_VERSION_TLV			0x0005
#define CDP_PLATFORM_TLV		0x0006
#define CDP_NATIVE_VLAN_TLV		0x000a
#define CDP_APPLIANCE_VLAN_TLV		0x000e
#define CDP_TRIGGER_TLV			0x000f
#define CDP_POWER_CONSUMPTION_TLV	0x0010
#define CDP_SYSNAME_TLV			0x0014
#define CDP_SYSOBJECT_TLV		0x0015
#define CDP_MANAGEMENT_ADDRESS_TLV	0x0016

#define CDP_TIMEOUT			(CFG_HZ/4)	/* one packet every 250ms */

static int CDPSeq;
static int CDPOK;

ushort CDPNativeVLAN;
ushort CDPApplianceVLAN;

static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 0x00 };

static ushort CDP_compute_csum(const uchar *buff, ushort len)
{
	ushort csum;
	int     odd;
	ulong   result = 0;
	ushort  leftover;

	if (len > 0) {
		odd = 1 & (ulong)buff;
		if (odd) {
			result = *buff << 8;
			len--;
			buff++;
		}
		while (len > 1) {
			result += *((const ushort *)buff)++;
			if (result & 0x80000000)
				result = (result & 0xFFFF) + (result >> 16);
			len -= 2;
		}
		if (len) {
			leftover = (signed short)(*(const signed char *)buff);
			/* * XXX CISCO SUCKS big time! (and blows too) */
			result = (result & 0xffff0000) | ((result + leftover) & 0x0000ffff);
		}
		while (result >> 16)
			result = (result & 0xFFFF) + (result >> 16);

		if (odd)
			result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
	}

	/* add up 16-bit and 17-bit words for 17+c bits */
	result = (result & 0xffff) + (result >> 16);
	/* add up 16-bit and 2-bit for 16+c bit */
	result = (result & 0xffff) + (result >> 16);
	/* add up carry.. */
	result = (result & 0xffff) + (result >> 16);

	/* negate */
	csum = ~(ushort)result;

	/* run time endian detection */
	if (csum != htons(csum))	/* little endian */
		csum = htons(csum);

	return csum;
}

int CDPSendTrigger(void)
{
	volatile uchar *pkt;
	volatile ushort *s;
	volatile ushort *cp;
	Ethernet_t *et;
	int len;
	ushort chksum;
#if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID)   || \
    defined(CONFIG_CDP_VERSION)   || defined(CONFIG_CDP_PLATFORM)
	char buf[32];
#endif

	pkt = NetTxPacket;
	et = (Ethernet_t *)pkt;

	/* NOTE: trigger sent not on any VLAN */

	/* form ethernet header */
	memcpy(et->et_dest, NetCDPAddr, 6);
	memcpy(et->et_src, NetOurEther, 6);

	pkt += ETHER_HDR_SIZE;

	/* SNAP header */
	memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr));
	pkt += sizeof(CDP_SNAP_hdr);

	/* CDP header */
	*pkt++ = 0x02;				/* CDP version 2 */
	*pkt++ = 180;				/* TTL */
	s = (volatile ushort *)pkt;
	cp = s;
	*s++ = htons(0);			/* checksum (0 for later calculation) */

	/* CDP fields */
#ifdef CONFIG_CDP_DEVICE_ID
	*s++ = htons(CDP_DEVICE_ID_TLV);
	*s++ = htons(CONFIG_CDP_DEVICE_ID);
	memset(buf, 0, sizeof(buf));
	sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%02X%02X%02X%02X%02X%02X",
		NetOurEther[0] & 0xff, NetOurEther[1] & 0xff,
		NetOurEther[2] & 0xff, NetOurEther[3] & 0xff,
		NetOurEther[4] & 0xff, NetOurEther[5] & 0xff);
	memcpy((uchar *)s, buf, 16);
	s += 16 / 2;
#endif

#ifdef CONFIG_CDP_PORT_ID
	*s++ = htons(CDP_PORT_ID_TLV);
	memset(buf, 0, sizeof(buf));
	sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index());
	len = strlen(buf);
	if (len & 1)	/* make it even */
		len++;
	*s++ = htons(len + 4);
	memcpy((uchar *)s, buf, len);
	s += len / 2;
#endif

#ifdef CONFIG_CDP_CAPABILITIES
	*s++ = htons(CDP_CAPABILITIES_TLV);
	*s++ = htons(8);
	*(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES);
	s += 2;
#endif

#ifdef CONFIG_CDP_VERSION
	*s++ = htons(CDP_VERSION_TLV);
	memset(buf, 0, sizeof(buf));
	strcpy(buf, CONFIG_CDP_VERSION);
	len = strlen(buf);
	if (len & 1)	/* make it even */
		len++;
	*s++ = htons(len + 4);
	memcpy((uchar *)s, buf, len);
	s += len / 2;
#endif

#ifdef CONFIG_CDP_PLATFORM
	*s++ = htons(CDP_PLATFORM_TLV);
	memset(buf, 0, sizeof(buf));
	strcpy(buf, CONFIG_CDP_PLATFORM);
	len = strlen(buf);
	if (len & 1)	/* make it even */
		len++;
	*s++ = htons(len + 4);
	memcpy((uchar *)s, buf, len);
	s += len / 2;
#endif

#ifdef CONFIG_CDP_TRIGGER
	*s++ = htons(CDP_TRIGGER_TLV);
	*s++ = htons(8);
	*(ulong *)s = htonl(CONFIG_CDP_TRIGGER);
	s += 2;
#endif

#ifdef CONFIG_CDP_POWER_CONSUMPTION
	*s++ = htons(CDP_POWER_CONSUMPTION_TLV);
	*s++ = htons(6);
	*s++ = htons(CONFIG_CDP_POWER_CONSUMPTION);
#endif

	/* length of ethernet packet */
	len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE);
	et->et_protlen = htons(len);

	len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr);
	chksum = CDP_compute_csum((uchar *)NetTxPacket + len, (uchar *)s - (NetTxPacket + len));
	if (chksum == 0)
		chksum = 0xFFFF;
	*cp = htons(chksum);

	(void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket);
	return 0;
}

static void
CDPTimeout (void)
{
	CDPSeq++;

	if (CDPSeq < 3) {
		NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
		CDPSendTrigger();
		return;
	}

	/* if not OK try again */
	if (!CDPOK)
		NetStartAgain();
	else
		NetState = NETLOOP_SUCCESS;
}

static void
CDPDummyHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
{
	/* nothing */
}

static void
CDPHandler(const uchar * pkt, unsigned len)
{
	const uchar *t;
	const ushort *ss;
	ushort type, tlen;
	uchar applid;
	ushort vlan, nvlan;

	/* minimum size? */
	if (len < sizeof(CDP_SNAP_hdr) + 4)
		goto pkt_short;

	/* check for valid CDP SNAP header */
	if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0)
		return;

	pkt += sizeof(CDP_SNAP_hdr);
	len -= sizeof(CDP_SNAP_hdr);

	/* Version of CDP protocol must be >= 2 and TTL != 0 */
	if (pkt[0] < 0x02 || pkt[1] == 0)
		return;

	/* if version is greater than 0x02 maybe we'll have a problem; output a warning */
	if (pkt[0] != 0x02)
		printf("** WARNING: CDP packet received with a protocol version %d > 2\n",
				pkt[0] & 0xff);

	if (CDP_compute_csum(pkt, len) != 0)
		return;

	pkt += 4;
	len -= 4;

	vlan = htons(-1);
	nvlan = htons(-1);
	while (len > 0) {
		if (len < 4)
			goto pkt_short;

		ss = (const ushort *)pkt;
		type = ntohs(ss[0]);
		tlen = ntohs(ss[1]);
		if (tlen > len) {
			goto pkt_short;
		}

		pkt += tlen;
		len -= tlen;

		ss += 2;	/* point ss to the data of the TLV */
		tlen -= 4;

		switch (type) {
			case CDP_DEVICE_ID_TLV:
				break;
			case CDP_ADDRESS_TLV:
				break;
			case CDP_PORT_ID_TLV:
				break;
			case CDP_CAPABILITIES_TLV:
				break;
			case CDP_VERSION_TLV:
				break;
			case CDP_PLATFORM_TLV:
				break;
			case CDP_NATIVE_VLAN_TLV:
				nvlan = *ss;
				break;
			case CDP_APPLIANCE_VLAN_TLV:
				t = (const uchar *)ss;
				while (tlen > 0) {
					if (tlen < 3)
						goto pkt_short;

					applid = t[0];
					ss = (const ushort *)(t + 1);

#ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE
					if (applid == CONFIG_CDP_APPLIANCE_VLAN_TYPE)
						vlan = *ss;
#else
					vlan = ntohs(*ss);	/* XXX will this work; dunno */
#endif
					t += 3; tlen -= 3;
				}
				break;
			case CDP_TRIGGER_TLV:
				break;
			case CDP_POWER_CONSUMPTION_TLV:
				break;
			case CDP_SYSNAME_TLV:
				break;
			case CDP_SYSOBJECT_TLV:
				break;
			case CDP_MANAGEMENT_ADDRESS_TLV:
				break;
		}
	}

	CDPApplianceVLAN = vlan;
	CDPNativeVLAN = nvlan;

	CDPOK = 1;
	return;

 pkt_short:
	printf("** CDP packet is too short\n");
	return;
}

static void CDPStart(void)
{
#if defined(CONFIG_NET_MULTI)
	printf ("Using %s device\n", eth_get_name());
#endif
	CDPSeq = 0;
	CDPOK = 0;

	CDPNativeVLAN = htons(-1);
	CDPApplianceVLAN = htons(-1);

	NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
	NetSetHandler (CDPDummyHandler);

	CDPSendTrigger();
}
#endif	/* CFG_CMD_CDP */


void
NetReceive(volatile uchar * inpkt, int len)
{
	Ethernet_t *et;
	IP_t	*ip;
	ARP_t	*arp;
	IPaddr_t tmp;
	int	x;
	uchar *pkt;
#if (CONFIG_COMMANDS & CFG_CMD_CDP)
	int iscdp;
#endif
	ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;

#ifdef ET_DEBUG
	printf("packet received\n");
#endif