Add qemu 2.4.0

Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>

1 files changed, 1487 insertions, 0 deletions

diff --git a/qemu/roms/u-boot/net/net.c b/qemu/roms/u-boot/net/net.c
new file mode 100644
index 000000000..f7cc29f03
--- /dev/null
+++ b/qemu/roms/u-boot/net/net.c
@@ -0,0 +1,1487 @@
+/*
+ *	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
+ *
+ * LINK_LOCAL:
+ *
+ *	Prerequisites:	- own ethernet address
+ *	We want:	- own IP address
+ *	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 <command.h>
+#include <environment.h>
+#include <net.h>
+#if defined(CONFIG_STATUS_LED)
+#include <miiphy.h>
+#include <status_led.h>
+#endif
+#include <watchdog.h>
+#include <linux/compiler.h>
+#include "arp.h"
+#include "bootp.h"
+#include "cdp.h"
+#if defined(CONFIG_CMD_DNS)
+#include "dns.h"
+#endif
+#include "link_local.h"
+#include "nfs.h"
+#include "ping.h"
+#include "rarp.h"
+#if defined(CONFIG_CMD_SNTP)
+#include "sntp.h"
+#endif
+#include "tftp.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/** BOOTP EXTENTIONS **/
+
+/* Our subnet mask (0=unknown) */
+IPaddr_t	NetOurSubnetMask;
+/* Our gateways IP address */
+IPaddr_t	NetOurGatewayIP;
+/* Our DNS IP address */
+IPaddr_t	NetOurDNSIP;
+#if defined(CONFIG_BOOTP_DNS2)
+/* Our 2nd DNS IP address */
+IPaddr_t	NetOurDNS2IP;
+#endif
+/* Our NIS domain */
+char		NetOurNISDomain[32] = {0,};
+/* Our hostname */
+char		NetOurHostName[32] = {0,};
+/* Our bootpath */
+char		NetOurRootPath[64] = {0,};
+/* Our bootfile size in blocks */
+ushort		NetBootFileSize;
+
+#ifdef CONFIG_MCAST_TFTP	/* Multicast TFTP */
+IPaddr_t Mcast_addr;
+#endif
+
+/** END OF BOOTP EXTENTIONS **/
+
+/* The actual transferred size of the bootfile (in bytes) */
+ulong		NetBootFileXferSize;
+/* Our ethernet address */
+uchar		NetOurEther[6];
+/* Boot server enet address */
+uchar		NetServerEther[6];
+/* Our IP addr (0 = unknown) */
+IPaddr_t	NetOurIP;
+/* Server IP addr (0 = unknown) */
+IPaddr_t	NetServerIP;
+/* Current receive packet */
+uchar *NetRxPacket;
+/* Current rx packet length */
+int		NetRxPacketLen;
+/* IP packet ID */
+unsigned	NetIPID;
+/* Ethernet bcast address */
+uchar		NetBcastAddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
+uchar		NetEtherNullAddr[6];
+#ifdef CONFIG_API
+void		(*push_packet)(void *, int len) = 0;
+#endif
+/* Network loop state */
+enum net_loop_state net_state;
+/* Tried all network devices */
+int		NetRestartWrap;
+/* Network loop restarted */
+static int	NetRestarted;
+/* At least one device configured */
+static int	NetDevExists;
+
+/* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
+/* default is without VLAN */
+ushort		NetOurVLAN = 0xFFFF;
+/* ditto */
+ushort		NetOurNativeVLAN = 0xFFFF;
+
+/* Boot File name */
+char		BootFile[128];
+
+#if defined(CONFIG_CMD_SNTP)
+/* NTP server IP address */
+IPaddr_t	NetNtpServerIP;
+/* offset time from UTC */
+int		NetTimeOffset;
+#endif
+
+static uchar PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
+
+/* Receive packet */
+uchar *NetRxPackets[PKTBUFSRX];
+
+/* Current UDP RX packet handler */
+static rxhand_f *udp_packet_handler;
+/* Current ARP RX packet handler */
+static rxhand_f *arp_packet_handler;
+#ifdef CONFIG_CMD_TFTPPUT
+/* Current ICMP rx handler */
+static rxhand_icmp_f *packet_icmp_handler;
+#endif
+/* Current timeout handler */
+static thand_f *timeHandler;
+/* Time base value */
+static ulong	timeStart;
+/* Current timeout value */
+static ulong	timeDelta;
+/* THE transmit packet */
+uchar *NetTxPacket;
+
+static int net_check_prereq(enum proto_t protocol);
+
+static int NetTryCount;
+
+int __maybe_unused net_busy_flag;
+
+/**********************************************************************/
+
+static int on_bootfile(const char *name, const char *value, enum env_op op,
+	int flags)
+{
+	switch (op) {
+	case env_op_create:
+	case env_op_overwrite:
+		copy_filename(BootFile, value, sizeof(BootFile));
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+U_BOOT_ENV_CALLBACK(bootfile, on_bootfile);
+
+/*
+ * Check if autoload is enabled. If so, use either NFS or TFTP to download
+ * the boot file.
+ */
+void net_auto_load(void)
+{
+#if defined(CONFIG_CMD_NFS)
+	const char *s = getenv("autoload");
+
+	if (s != NULL && strcmp(s, "NFS") == 0) {
+		/*
+		 * Use NFS to load the bootfile.
+		 */
+		NfsStart();
+		return;
+	}
+#endif
+	if (getenv_yesno("autoload") == 0) {
+		/*
+		 * Just use BOOTP/RARP to configure system;
+		 * Do not use TFTP to load the bootfile.
+		 */
+		net_set_state(NETLOOP_SUCCESS);
+		return;
+	}
+	TftpStart(TFTPGET);
+}
+
+static void NetInitLoop(void)
+{
+	static int env_changed_id;
+	int env_id = get_env_id();
+
+	/* update only when the environment has changed */
+	if (env_changed_id != env_id) {
+		NetOurIP = getenv_IPaddr("ipaddr");
+		NetOurGatewayIP = getenv_IPaddr("gatewayip");
+		NetOurSubnetMask = getenv_IPaddr("netmask");
+		NetServerIP = getenv_IPaddr("serverip");
+		NetOurNativeVLAN = getenv_VLAN("nvlan");
+		NetOurVLAN = getenv_VLAN("vlan");
+#if defined(CONFIG_CMD_DNS)
+		NetOurDNSIP = getenv_IPaddr("dnsip");
+#endif
+		env_changed_id = env_id;
+	}
+	if (eth_get_dev())
+		memcpy(NetOurEther, eth_get_dev()->enetaddr, 6);
+
+	return;
+}
+
+static void net_clear_handlers(void)
+{
+	net_set_udp_handler(NULL);
+	net_set_arp_handler(NULL);
+	NetSetTimeout(0, NULL);
+}
+
+static void net_cleanup_loop(void)
+{
+	net_clear_handlers();
+}
+
+void net_init(void)
+{
+	static int first_call = 1;
+
+	if (first_call) {
+		/*
+		 *	Setup packet buffers, aligned correctly.
+		 */
+		int i;
+
+		NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
+		NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
+		for (i = 0; i < PKTBUFSRX; i++)
+			NetRxPackets[i] = NetTxPacket + (i + 1) * PKTSIZE_ALIGN;
+
+		ArpInit();
+		net_clear_handlers();
+
+		/* Only need to setup buffer pointers once. */
+		first_call = 0;
+	}
+
+	NetInitLoop();
+}
+
+/**********************************************************************/
+/*
+ *	Main network processing loop.
+ */
+
+int NetLoop(enum proto_t protocol)
+{
+	bd_t *bd = gd->bd;
+	int ret = -1;
+
+	NetRestarted = 0;
+	NetDevExists = 0;
+	NetTryCount = 1;
+	debug_cond(DEBUG_INT_STATE, "--- NetLoop Entry\n");
+
+	bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
+	net_init();
+	if (eth_is_on_demand_init() || protocol != NETCONS) {
+		eth_halt();
+		eth_set_current();
+		if (eth_init(bd) < 0) {
+			eth_halt();
+			return -1;
+		}
+	} else
+		eth_init_state_only(bd);
+
+restart:
+#ifdef CONFIG_USB_KEYBOARD
+	net_busy_flag = 0;
+#endif
+	net_set_state(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.
+	 */
+	debug_cond(DEBUG_INT_STATE, "--- NetLoop Init\n");
+	NetInitLoop();
+
+	switch (net_check_prereq(protocol)) {
+	case 1:
+		/* network not configured */
+		eth_halt();
+		return -1;
+
+	case 2:
+		/* network device not configured */
+		break;
+
+	case 0:
+		NetDevExists = 1;
+		NetBootFileXferSize = 0;
+		switch (protocol) {
+		case TFTPGET:
+#ifdef CONFIG_CMD_TFTPPUT
+		case TFTPPUT:
+#endif
+			/* always use ARP to get server ethernet address */
+			TftpStart(protocol);
+			break;
+#ifdef CONFIG_CMD_TFTPSRV
+		case TFTPSRV:
+			TftpStartServer();
+			break;
+#endif
+#if defined(CONFIG_CMD_DHCP)
+		case DHCP:
+			BootpTry = 0;
+			NetOurIP = 0;
+			DhcpRequest();		/* Basically same as BOOTP */
+			break;
+#endif
+
+		case BOOTP:
+			BootpTry = 0;
+			NetOurIP = 0;
+			BootpRequest();
+			break;
+
+#if defined(CONFIG_CMD_RARP)
+		case RARP:
+			RarpTry = 0;
+			NetOurIP = 0;
+			RarpRequest();
+			break;
+#endif
+#if defined(CONFIG_CMD_PING)
+		case PING:
+			ping_start();
+			break;
+#endif
+#if defined(CONFIG_CMD_NFS)
+		case NFS:
+			NfsStart();
+			break;
+#endif
+#if defined(CONFIG_CMD_CDP)
+		case CDP:
+			CDPStart();
+			break;
+#endif
+#ifdef CONFIG_NETCONSOLE
+		case NETCONS:
+			NcStart();
+			break;
+#endif
+#if defined(CONFIG_CMD_SNTP)
+		case SNTP:
+			SntpStart();
+			break;
+#endif
+#if defined(CONFIG_CMD_DNS)
+		case DNS:
+			DnsStart();
+			break;
+#endif
+#if defined(CONFIG_CMD_LINK_LOCAL)
+		case LINKLOCAL:
+			link_local_start();
+			break;
+#endif
+		default:
+			break;
+		}
+
+		break;
+	}
+
+#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
+#if	defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)	&& \
+	defined(CONFIG_STATUS_LED)			&& \
+	defined(STATUS_LED_RED)
+	/*
+	 * Echo the inverted link state to the fault LED.
+	 */
+	if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
+		status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
+	else
+		status_led_set(STATUS_LED_RED, STATUS_LED_ON);
+#endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
+#endif /* CONFIG_MII, ... */
+#ifdef CONFIG_USB_KEYBOARD
+	net_busy_flag = 1;
+#endif
+
+	/*
+	 *	Main packet reception loop.  Loop receiving packets until
+	 *	someone sets `net_state' to a state that terminates.
+	 */
+	for (;;) {
+		WATCHDOG_RESET();
+#ifdef CONFIG_SHOW_ACTIVITY
+		show_activity(1);
+#endif
+		/*
+		 *	Check the ethernet for a new packet.  The ethernet
+		 *	receive routine will process it.
+		 */
+		eth_rx();
+
+		/*
+		 *	Abort if ctrl-c was pressed.
+		 */
+		if (ctrlc()) {
+			/* cancel any ARP that may not have completed */
+			NetArpWaitPacketIP = 0;
+
+			net_cleanup_loop();
+			eth_halt();
+			/* Invalidate the last protocol */
+			eth_set_last_protocol(BOOTP);
+
+			puts("\nAbort\n");
+			/* include a debug print as well incase the debug
+			   messages are directed to stderr */
+			debug_cond(DEBUG_INT_STATE, "--- NetLoop Abort!\n");
+			goto done;
+		}
+
+		ArpTimeoutCheck();
+
+		/*
+		 *	Check for a timeout, and run the timeout handler
+		 *	if we have one.
+		 */
+		if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
+			thand_f *x;
+
+#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
+#if	defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)	&& \
+	defined(CONFIG_STATUS_LED)			&& \
+	defined(STATUS_LED_RED)
+			/*
+			 * Echo the inverted link state to the fault LED.
+			 */
+			if (miiphy_link(eth_get_dev()->name,
+				       CONFIG_SYS_FAULT_MII_ADDR)) {
+				status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
+			} else {
+				status_led_set(STATUS_LED_RED, STATUS_LED_ON);
+			}
+#endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
+#endif /* CONFIG_MII, ... */
+			debug_cond(DEBUG_INT_STATE, "--- NetLoop timeout\n");
+			x = timeHandler;
+			timeHandler = (thand_f *)0;
+			(*x)();
+		}
+
+
+		switch (net_state) {
+
+		case NETLOOP_RESTART:
+			NetRestarted = 1;
+			goto restart;
+
+		case NETLOOP_SUCCESS:
+			net_cleanup_loop();
+			if (NetBootFileXferSize > 0) {
+				printf("Bytes transferred = %ld (%lx hex)\n",
+					NetBootFileXferSize,
+					NetBootFileXferSize);
+				setenv_hex("filesize", NetBootFileXferSize);
+				setenv_hex("fileaddr", load_addr);
+			}
+			if (protocol != NETCONS)
+				eth_halt();
+			else
+				eth_halt_state_only();
+
+			eth_set_last_protocol(protocol);
+
+			ret = NetBootFileXferSize;
+			debug_cond(DEBUG_INT_STATE, "--- NetLoop Success!\n");
+			goto done;
+
+		case NETLOOP_FAIL:
+			net_cleanup_loop();
+			/* Invalidate the last protocol */
+			eth_set_last_protocol(BOOTP);
+			debug_cond(DEBUG_INT_STATE, "--- NetLoop Fail!\n");
+			goto done;
+
+		case NETLOOP_CONTINUE:
+			continue;
+		}
+	}
+
+done:
+#ifdef CONFIG_USB_KEYBOARD
+	net_busy_flag = 0;
+#endif
+#ifdef CONFIG_CMD_TFTPPUT
+	/* Clear out the handlers */
+	net_set_udp_handler(NULL);
+	net_set_icmp_handler(NULL);
+#endif
+	return ret;
+}
+
+/**********************************************************************/
+
+static void
+startAgainTimeout(void)
+{
+	net_set_state(NETLOOP_RESTART);
+}
+
+void NetStartAgain(void)
+{
+	char *nretry;
+	int retry_forever = 0;
+	unsigned long retrycnt = 0;
+
+	nretry = getenv("netretry");
+	if (nretry) {
+		if (!strcmp(nretry, "yes"))
+			retry_forever = 1;
+		else if (!strcmp(nretry, "no"))
+			retrycnt = 0;
+		else if (!strcmp(nretry, "once"))
+			retrycnt = 1;
+		else
+			retrycnt = simple_strtoul(nretry, NULL, 0);
+	} else
+		retry_forever = 1;
+
+	if ((!retry_forever) && (NetTryCount >= retrycnt)) {
+		eth_halt();
+		net_set_state(NETLOOP_FAIL);
+		return;
+	}
+
+	NetTryCount++;
+
+	eth_halt();
+#if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
+	eth_try_another(!NetRestarted);
+#endif
+	eth_init(gd->bd);
+	if (NetRestartWrap) {
+		NetRestartWrap = 0;
+		if (NetDevExists) {
+			NetSetTimeout(10000UL, startAgainTimeout);
+			net_set_udp_handler(NULL);
+		} else {
+			net_set_state(NETLOOP_FAIL);
+		}
+	} else {
+		net_set_state(NETLOOP_RESTART);
+	}
+}
+
+/**********************************************************************/
+/*
+ *	Miscelaneous bits.
+ */
+
+static void dummy_handler(uchar *pkt, unsigned dport,
+			IPaddr_t sip, unsigned sport,
+			unsigned len)
+{
+}
+
+rxhand_f *net_get_udp_handler(void)
+{
+	return udp_packet_handler;
+}
+
+void net_set_udp_handler(rxhand_f *f)
+{
+	debug_cond(DEBUG_INT_STATE, "--- NetLoop UDP handler set (%p)\n", f);
+	if (f == NULL)
+		udp_packet_handler = dummy_handler;
+	else
+		udp_packet_handler = f;
+}
+
+rxhand_f *net_get_arp_handler(void)
+{
+	return arp_packet_handler;
+}
+
+void net_set_arp_handler(rxhand_f *f)
+{
+	debug_cond(DEBUG_INT_STATE, "--- NetLoop ARP handler set (%p)\n", f);
+	if (f == NULL)
+		arp_packet_handler = dummy_handler;
+	else
+		arp_packet_handler = f;
+}
+
+#ifdef CONFIG_CMD_TFTPPUT
+void net_set_icmp_handler(rxhand_icmp_f *f)
+{
+	packet_icmp_handler = f;
+}
+#endif
+
+void
+NetSetTimeout(ulong iv, thand_f *f)
+{
+	if (iv == 0) {
+		debug_cond(DEBUG_INT_STATE,
+			"--- NetLoop timeout handler cancelled\n");
+		timeHandler = (thand_f *)0;
+	} else {
+		debug_cond(DEBUG_INT_STATE,
+			"--- NetLoop timeout handler set (%p)\n", f);
+		timeHandler = f;
+		timeStart = get_timer(0);
+		timeDelta = iv * CONFIG_SYS_HZ / 1000;
+	}
+}
+
+int NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport,
+		int payload_len)
+{
+	uchar *pkt;
+	int eth_hdr_size;
+	int pkt_hdr_size;
+
+	/* make sure the NetTxPacket is initialized (NetInit() was called) */
+	assert(NetTxPacket != NULL);
+	if (NetTxPacket == NULL)
+		return -1;
+
+	/* 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;
+
+	pkt = (uchar *)NetTxPacket;
+
+	eth_hdr_size = NetSetEther(pkt, ether, PROT_IP);
+	pkt += eth_hdr_size;
+	net_set_udp_header(pkt, dest, dport, sport, payload_len);
+	pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
+
+	/* if MAC address was not discovered yet, do an ARP request */
+	if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
+		debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest);
+
+		/* save the ip and eth addr for the packet to send after arp */
+		NetArpWaitPacketIP = dest;
+		NetArpWaitPacketMAC = ether;
+
+		/* size of the waiting packet */
+		NetArpWaitTxPacketSize = pkt_hdr_size + payload_len;
+
+		/* and do the ARP request */
+		NetArpWaitTry = 1;
+		NetArpWaitTimerStart = get_timer(0);
+		ArpRequest();
+		return 1;	/* waiting */
+	} else {
+		debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
+			&dest, ether);
+		NetSendPacket(NetTxPacket, pkt_hdr_size + payload_len);
+		return 0;	/* transmitted */
+	}
+}
+
+#ifdef CONFIG_IP_DEFRAG
+/*
+ * This function collects fragments in a single packet, according
+ * to the algorithm in RFC815. It returns NULL or the pointer to
+ * a complete packet, in static storage
+ */
+#ifndef CONFIG_NET_MAXDEFRAG
+#define CONFIG_NET_MAXDEFRAG 16384
+#endif
+/*
+ * MAXDEFRAG, above, is chosen in the config file and  is real data
+ * so we need to add the NFS overhead, which is more than TFTP.
+ * To use sizeof in the internal unnamed structures, we need a real
+ * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately).
+ * The compiler doesn't complain nor allocates the actual structure
+ */
+static struct rpc_t rpc_specimen;
+#define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply))
+
+#define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE)
+
+/*
+ * this is the packet being assembled, either data or frag control.
+ * Fragments go by 8 bytes, so this union must be 8 bytes long
+ */
+struct hole {
+	/* first_byte is address of this structure */
+	u16 last_byte;	/* last byte in this hole + 1 (begin of next hole) */
+	u16 next_hole;	/* index of next (in 8-b blocks), 0 == none */
+	u16 prev_hole;	/* index of prev, 0 == none */
+	u16 unused;
+};
+
+static struct ip_udp_hdr *__NetDefragment(struct ip_udp_hdr *ip, int *lenp)
+{
+	static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
+	static u16 first_hole, total_len;
+	struct hole *payload, *thisfrag, *h, *newh;
+	struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff;
+	uchar *indata = (uchar *)ip;
+	int offset8, start, len, done = 0;
+	u16 ip_off = ntohs(ip->ip_off);
+
+	/* payload starts after IP header, this fragment is in there */
+	payload = (struct hole *)(pkt_buff + IP_HDR_SIZE);
+	offset8 =  (ip_off & IP_OFFS);
+	thisfrag = payload + offset8;
+	start = offset8 * 8;
+	len = ntohs(ip->ip_len) - IP_HDR_SIZE;
+
+	if (start + len > IP_MAXUDP) /* fragment extends too far */
+		return NULL;
+
+	if (!total_len || localip->ip_id != ip->ip_id) {
+		/* new (or different) packet, reset structs */
+		total_len = 0xffff;
+		payload[0].last_byte = ~0;
+		payload[0].next_hole = 0;
+		payload[0].prev_hole = 0;
+		first_hole = 0;
+		/* any IP header will work, copy the first we received */
+		memcpy(localip, ip, IP_HDR_SIZE);
+	}
+
+	/*
+	 * What follows is the reassembly algorithm. We use the payload
+	 * array as a linked list of hole descriptors, as each hole starts
+	 * at a multiple of 8 bytes. However, last byte can be whatever value,
+	 * so it is represented as byte count, not as 8-byte blocks.
+	 */
+
+	h = payload + first_hole;
+	while (h->last_byte < start) {
+		if (!h->next_hole) {
+			/* no hole that far away */
+			return NULL;
+		}
+		h = payload + h->next_hole;
+	}
+
+	/* last fragment may be 1..7 bytes, the "+7" forces acceptance */
+	if (offset8 + ((len + 7) / 8) <= h - payload) {
+		/* no overlap with holes (dup fragment?) */
+		return NULL;
+	}
+
+	if (!(ip_off & IP_FLAGS_MFRAG)) {
+		/* no more fragmentss: truncate this (last) hole */
+		total_len = start + len;
+		h->last_byte = start + len;
+	}
+
+	/*
+	 * There is some overlap: fix the hole list. This code doesn't
+	 * deal with a fragment that overlaps with two different holes
+	 * (thus being a superset of a previously-received fragment).
+	 */
+
+	if ((h >= thisfrag) && (h->last_byte <= start + len)) {
+		/* complete overlap with hole: remove hole */
+		if (!h->prev_hole && !h->next_hole) {
+			/* last remaining hole */
+			done = 1;
+		} else if (!h->prev_hole) {
+			/* first hole */
+			first_hole = h->next_hole;
+			payload[h->next_hole].prev_hole = 0;
+		} else if (!h->next_hole) {
+			/* last hole */
+			payload[h->prev_hole].next_hole = 0;
+		} else {
+			/* in the middle of the list */
+			payload[h->next_hole].prev_hole = h->prev_hole;
+			payload[h->prev_hole].next_hole = h->next_hole;
+		}
+
+	} else if (h->last_byte <= start + len) {
+		/* overlaps with final part of the hole: shorten this hole */
+		h->last_byte = start;
+
+	} else if (h >= thisfrag) {
+		/* overlaps with initial part of the hole: move this hole */
+		newh = thisfrag + (len / 8);
+		*newh = *h;
+		h = newh;
+		if (h->next_hole)
+			payload[h->next_hole].prev_hole = (h - payload);
+		if (h->prev_hole)
+			payload[h->prev_hole].next_hole = (h - payload);
+		else
+			first_hole = (h - payload);
+
+	} else {
+		/* fragment sits in the middle: split the hole */
+		newh = thisfrag + (len / 8);
+		*newh = *h;
+		h->last_byte = start;
+		h->next_hole = (newh - payload);
+		newh->prev_hole = (h - payload);
+		if (newh->next_hole)
+			payload[newh->next_hole].prev_hole = (newh - payload);
+	}
+
+	/* finally copy this fragment and possibly return whole packet */
+	memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len);
+	if (!done)
+		return NULL;
+
+	localip->ip_len = htons(total_len);
+	*lenp = total_len + IP_HDR_SIZE;
+	return localip;
+}
+
+static inline struct ip_udp_hdr *NetDefragment(struct ip_udp_hdr *ip, int *lenp)
+{
+	u16 ip_off = ntohs(ip->ip_off);
+	if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
+		return ip; /* not a fragment */
+	return __NetDefragment(ip, lenp);
+}
+
+#else /* !CONFIG_IP_DEFRAG */
+
+static inline struct ip_udp_hdr *NetDefragment(struct ip_udp_hdr *ip, int *lenp)
+{
+	u16 ip_off = ntohs(ip->ip_off);
+	if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
+		return ip; /* not a fragment */
+	return NULL;
+}
+#endif
+
+/**
+ * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
+ * drop others.
+ *
+ * @parma ip	IP packet containing the ICMP
+ */
+static void receive_icmp(struct ip_udp_hdr *ip, int len,
+			IPaddr_t src_ip, struct ethernet_hdr *et)
+{
+	struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
+
+	switch (icmph->type) {
+	case ICMP_REDIRECT:
+		if (icmph->code != ICMP_REDIR_HOST)
+			return;
+		printf(" ICMP Host Redirect to %pI4 ",
+			&icmph->un.gateway);
+		break;
+	default:
+#if defined(CONFIG_CMD_PING)
+		ping_receive(et, ip, len);
+#endif
+#ifdef CONFIG_CMD_TFTPPUT
+		if (packet_icmp_handler)
+			packet_icmp_handler(icmph->type, icmph->code,
+				ntohs(ip->udp_dst), src_ip, ntohs(ip->udp_src),
+				icmph->un.data, ntohs(ip->udp_len));
+#endif
+		break;
+	}
+}
+
+void
+NetReceive(uchar *inpkt, int len)
+{
+	struct ethernet_hdr *et;
+	struct ip_udp_hdr *ip;
+	IPaddr_t dst_ip;
+	IPaddr_t src_ip;
+	int eth_proto;
+#if defined(CONFIG_CMD_CDP)
+	int iscdp;
+#endif
+	ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
+
+	debug_cond(DEBUG_NET_PKT, "packet received\n");
+
+	NetRxPacket = inpkt;
+	NetRxPacketLen = len;
+	et = (struct ethernet_hdr *)inpkt;
+
+	/* too small packet? */
+	if (len < ETHER_HDR_SIZE)
+		return;
+
+#ifdef CONFIG_API
+	if (push_packet) {
+		(*push_packet)(inpkt, len);
+		return;
+	}
+#endif
+
+#if defined(CONFIG_CMD_CDP)
+	/* keep track if packet is CDP */
+	iscdp = is_cdp_packet(et->et_dest);
+#endif
+
+	myvlanid = ntohs(NetOurVLAN);
+	if (myvlanid == (ushort)-1)
+		myvlanid = VLAN_NONE;
+	mynvlanid = ntohs(NetOurNativeVLAN);
+	if (mynvlanid == (ushort)-1)
+		mynvlanid = VLAN_NONE;
+
+	eth_proto = ntohs(et->et_protlen);
+
+	if (eth_proto < 1514) {
+		struct e802_hdr *et802 = (struct e802_hdr *)et;
+		/*
+		 *	Got a 802.2 packet.  Check the other protocol field.
+		 *	XXX VLAN over 802.2+SNAP not implemented!
+		 */
+		eth_proto = ntohs(et802->et_prot);
+
+		ip = (struct ip_udp_hdr *)(inpkt + E802_HDR_SIZE);
+		len -= E802_HDR_SIZE;
+
+	} else if (eth_proto != PROT_VLAN) {	/* normal packet */
+		ip = (struct ip_udp_hdr *)(inpkt + ETHER_HDR_SIZE);
+		len -= ETHER_HDR_SIZE;
+
+	} else {			/* VLAN packet */
+		struct vlan_ethernet_hdr *vet =
+			(struct vlan_ethernet_hdr *)et;
+
+		debug_cond(DEBUG_NET_PKT, "VLAN packet received\n");
+
+		/* too small packet? */
+		if (len < VLAN_ETHER_HDR_SIZE)
+			return;
+
+		/* if no VLAN active */
+		if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
+#if defined(CONFIG_CMD_CDP)
+				&& iscdp == 0
+#endif
+				)
+			return;
+
+		cti = ntohs(vet->vet_tag);
+		vlanid = cti & VLAN_IDMASK;
+		eth_proto = ntohs(vet->vet_type);
+
+		ip = (struct ip_udp_hdr *)(inpkt + VLAN_ETHER_HDR_SIZE);
+		len -= VLAN_ETHER_HDR_SIZE;
+	}
+
+	debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto);
+
+#if defined(CONFIG_CMD_CDP)
+	if (iscdp) {
+		cdp_receive((uchar *)ip, len);
+		return;
+	}
+#endif
+
+	if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
+		if (vlanid == VLAN_NONE)
+			vlanid = (mynvlanid & VLAN_IDMASK);
+		/* not matched? */
+		if (vlanid != (myvlanid & VLAN_IDMASK))
+			return;
+	}
+
+	switch (eth_proto) {
+
+	case PROT_ARP:
+		ArpReceive(et, ip, len);
+		break;
+
+#ifdef CONFIG_CMD_RARP
+	case PROT_RARP:
+		rarp_receive(ip, len);
+		break;
+#endif
+	case PROT_IP:
+		debug_cond(DEBUG_NET_PKT, "Got IP\n");
+		/* Before we start poking the header, make sure it is there */
+		if (len < IP_UDP_HDR_SIZE) {
+			debug("len bad %d < %lu\n", len,
+				(ulong)IP_UDP_HDR_SIZE);
+			return;
+		}
+		/* Check the packet length */
+		if (len < ntohs(ip->ip_len)) {
+			debug("len bad %d < %d\n", len, ntohs(ip->ip_len));
+			return;
+		}
+		len = ntohs(ip->ip_len);
+		debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n",
+			len, ip->ip_hl_v & 0xff);
+
+		/* Can't deal with anything except IPv4 */
+		if ((ip->ip_hl_v & 0xf0) != 0x40)
+			return;
+		/* Can't deal with IP options (headers != 20 bytes) */
+		if ((ip->ip_hl_v & 0x0f) > 0x05)
+			return;
+		/* Check the Checksum of the header */
+		if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE / 2)) {
+			debug("checksum bad\n");
+			return;
+		}
+		/* If it is not for us, ignore it */
+		dst_ip = NetReadIP(&ip->ip_dst);
+		if (NetOurIP && dst_ip != NetOurIP && dst_ip != 0xFFFFFFFF) {
+#ifdef CONFIG_MCAST_TFTP
+			if (Mcast_addr != dst_ip)
+#endif
+				return;
+		}
+		/* Read source IP address for later use */
+		src_ip = NetReadIP(&ip->ip_src);
+		/*
+		 * The function returns the unchanged packet if it's not
+		 * a fragment, and either the complete packet or NULL if
+		 * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
+		 */
+		ip = NetDefragment(ip, &len);
+		if (!ip)
+			return;
+		/*
+		 * watch for ICMP host redirects
+		 *
+		 * There is no real handler code (yet). We just watch
+		 * for ICMP host redirect messages. In case anybody
+		 * sees these messages: please contact me
+		 * (wd@denx.de), or - even better - send me the
+		 * necessary fixes :-)
+		 *
+		 * Note: in all cases where I have seen this so far
+		 * it was a problem with the router configuration,
+		 * for instance when a router was configured in the
+		 * BOOTP reply, but the TFTP server was on the same
+		 * subnet. So this is probably a warning that your
+		 * configuration might be wrong. But I'm not really
+		 * sure if there aren't any other situations.
+		 *
+		 * Simon Glass <sjg@chromium.org>: We get an ICMP when
+		 * we send a tftp packet to a dead connection, or when
+		 * there is no server at the other end.
+		 */
+		if (ip->ip_p == IPPROTO_ICMP) {
+			receive_icmp(ip, len, src_ip, et);
+			return;
+		} else if (ip->ip_p != IPPROTO_UDP) {	/* Only UDP packets */
+			return;
+		}
+
+		debug_cond(DEBUG_DEV_PKT,
+			"received UDP (to=%pI4, from=%pI4, len=%d)\n",
+			&dst_ip, &src_ip, len);
+
+#ifdef CONFIG_UDP_CHECKSUM
+		if (ip->udp_xsum != 0) {
+			ulong   xsum;
+			ushort *sumptr;
+			ushort  sumlen;
+
+			xsum  = ip->ip_p;
+			xsum += (ntohs(ip->udp_len));
+			xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
+			xsum += (ntohl(ip->ip_src) >>  0) & 0x0000ffff;
+			xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
+			xsum += (ntohl(ip->ip_dst) >>  0) & 0x0000ffff;
+
+			sumlen = ntohs(ip->udp_len);
+			sumptr = (ushort *) &(ip->udp_src);
+
+			while (sumlen > 1) {
+				ushort sumdata;
+
+				sumdata = *sumptr++;
+				xsum += ntohs(sumdata);
+				sumlen -= 2;
+			}
+			if (sumlen > 0) {
+				ushort sumdata;
+
+				sumdata = *(unsigned char *) sumptr;
+				sumdata = (sumdata << 8) & 0xff00;
+				xsum += sumdata;
+			}
+			while ((xsum >> 16) != 0) {
+				xsum = (xsum & 0x0000ffff) +
+				       ((xsum >> 16) & 0x0000ffff);
+			}
+			if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
+				printf(" UDP wrong checksum %08lx %08x\n",
+					xsum, ntohs(ip->udp_xsum));
+				return;
+			}
+		}
+#endif
+
+
+#ifdef CONFIG_NETCONSOLE
+		nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
+					src_ip,
+					ntohs(ip->udp_dst),
+					ntohs(ip->udp_src),
+					ntohs(ip->udp_len) - UDP_HDR_SIZE);
+#endif
+		/*
+		 *	IP header OK.  Pass the packet to the current handler.
+		 */
+		(*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE,
+				ntohs(ip->udp_dst),
+				src_ip,
+				ntohs(ip->udp_src),
+				ntohs(ip->udp_len) - UDP_HDR_SIZE);
+		break;
+	}
+}
+
+
+/**********************************************************************/
+
+static int net_check_prereq(enum proto_t protocol)
+{
+	switch (protocol) {
+		/* Fall through */
+#if defined(CONFIG_CMD_PING)
+	case PING:
+		if (NetPingIP == 0) {
+			puts("*** ERROR: ping address not given\n");
+			return 1;
+		}
+		goto common;
+#endif
+#if defined(CONFIG_CMD_SNTP)
+	case SNTP:
+		if (NetNtpServerIP == 0) {
+			puts("*** ERROR: NTP server address not given\n");
+			return 1;
+		}
+		goto common;
+#endif
+#if defined(CONFIG_CMD_DNS)
+	case DNS:
+		if (NetOurDNSIP == 0) {
+			puts("*** ERROR: DNS server address not given\n");
+			return 1;
+		}
+		goto common;
+#endif
+#if defined(CONFIG_CMD_NFS)
+	case NFS:
+#endif
+	case TFTPGET:
+	case TFTPPUT:
+		if (NetServerIP == 0) {
+			puts("*** ERROR: `serverip' not set\n");
+			return 1;
+		}
+#if	defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
+	defined(CONFIG_CMD_DNS)
+common:
+#endif
+		/* Fall through */
+
+	case NETCONS:
+	case TFTPSRV:
+		if (NetOurIP == 0) {
+			puts("*** ERROR: `ipaddr' not set\n");
+			return 1;
+		}
+		/* Fall through */
+
+#ifdef CONFIG_CMD_RARP
+	case RARP:
+#endif
+	case BOOTP:
+	case CDP:
+	case DHCP:
+	case LINKLOCAL:
+		if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
+			int num = eth_get_dev_index();
+
+			switch (num) {
+			case -1:
+				puts("*** ERROR: No ethernet found.\n");
+				return 1;
+			case 0:
+				puts("*** ERROR: `ethaddr' not set\n");
+				break;
+			default:
+				printf("*** ERROR: `eth%daddr' not set\n",
+					num);
+				break;
+			}
+
+			NetStartAgain();
+			return 2;
+		}
+		/* Fall through */
+	default:
+		return 0;
+	}
+	return 0;		/* OK */
+}
+/**********************************************************************/
+
+int
+NetCksumOk(uchar *ptr, int len)
+{
+	return !((NetCksum(ptr, len) + 1) & 0xfffe);
+}
+
+
+unsigned
+NetCksum(uchar *ptr, int len)
+{
+	ulong	xsum;
+	ushort *p = (ushort *)ptr;
+
+	xsum = 0;
+	while (len-- > 0)
+		xsum += *p++;
+	xsum = (xsum & 0xffff) + (xsum >> 16);
+	xsum = (xsum & 0xffff) + (xsum >> 16);
+	return xsum & 0xffff;
+}
+
+int
+NetEthHdrSize(void)
+{
+	ushort myvlanid;
+
+	myvlanid = ntohs(NetOurVLAN);
+	if (myvlanid == (ushort)-1)
+		myvlanid = VLAN_NONE;
+
+	return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
+		VLAN_ETHER_HDR_SIZE;
+}
+
+int
+NetSetEther(uchar *xet, uchar * addr, uint prot)
+{
+	struct ethernet_hdr *et = (struct ethernet_hdr *)xet;
+	ushort myvlanid;
+
+	myvlanid = ntohs(NetOurVLAN);
+	if (myvlanid == (ushort)-1)
+		myvlanid = VLAN_NONE;
+
+	memcpy(et->et_dest, addr, 6);
+	memcpy(et->et_src, NetOurEther, 6);
+	if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
+		et->et_protlen = htons(prot);
+		return ETHER_HDR_SIZE;
+	} else {
+		struct vlan_ethernet_hdr *vet =
+			(struct vlan_ethernet_hdr *)xet;
+
+		vet->vet_vlan_type = htons(PROT_VLAN);
+		vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
+		vet->vet_type = htons(prot);
+		return VLAN_ETHER_HDR_SIZE;
+	}
+}
+
+int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
+{
+	ushort protlen;
+
+	memcpy(et->et_dest, addr, 6);
+	memcpy(et->et_src, NetOurEther, 6);
+	protlen = ntohs(et->et_protlen);
+	if (protlen == PROT_VLAN) {
+		struct vlan_ethernet_hdr *vet =
+			(struct vlan_ethernet_hdr *)et;
+		vet->vet_type = htons(prot);
+		return VLAN_ETHER_HDR_SIZE;
+	} else if (protlen > 1514) {
+		et->et_protlen = htons(prot);
+		return ETHER_HDR_SIZE;
+	} else {
+		/* 802.2 + SNAP */
+		struct e802_hdr *et802 = (struct e802_hdr *)et;
+		et802->et_prot = htons(prot);
+		return E802_HDR_SIZE;
+	}
+}
+
+void net_set_ip_header(uchar *pkt, IPaddr_t dest, IPaddr_t source)
+{
+	struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
+
+	/*
+	 *	Construct an IP header.
+	 */
+	/* IP_HDR_SIZE / 4 (not including UDP) */
+	ip->ip_hl_v  = 0x45;
+	ip->ip_tos   = 0;
+	ip->ip_len   = htons(IP_HDR_SIZE);
+	ip->ip_id    = htons(NetIPID++);
+	ip->ip_off   = htons(IP_FLAGS_DFRAG);	/* Don't fragment */
+	ip->ip_ttl   = 255;
+	ip->ip_sum   = 0;
+	/* already in network byte order */
+	NetCopyIP((void *)&ip->ip_src, &source);
+	/* already in network byte order */
+	NetCopyIP((void *)&ip->ip_dst, &dest);
+}
+
+void net_set_udp_header(uchar *pkt, IPaddr_t dest, int dport, int sport,
+			int len)
+{
+	struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
+
+	/*
+	 *	If the data is an odd number of bytes, zero the
+	 *	byte after the last byte so that the checksum
+	 *	will work.
+	 */
+	if (len & 1)
+		pkt[IP_UDP_HDR_SIZE + len] = 0;
+
+	net_set_ip_header(pkt, dest, NetOurIP);
+	ip->ip_len   = htons(IP_UDP_HDR_SIZE + len);
+	ip->ip_p     = IPPROTO_UDP;
+	ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE >> 1);
+
+	ip->udp_src  = htons(sport);
+	ip->udp_dst  = htons(dport);
+	ip->udp_len  = htons(UDP_HDR_SIZE + len);
+	ip->udp_xsum = 0;
+}
+
+void copy_filename(char *dst, const char *src, int size)
+{
+	if (*src && (*src == '"')) {
+		++src;
+		--size;
+	}
+
+	while ((--size > 0) && *src && (*src != '"'))
+		*dst++ = *src++;
+	*dst = '\0';
+}
+
+#if	defined(CONFIG_CMD_NFS)		|| \
+	defined(CONFIG_CMD_SNTP)	|| \
+	defined(CONFIG_CMD_DNS)
+/*
+ * make port a little random (1024-17407)
+ * This keeps the math somewhat trivial to compute, and seems to work with
+ * all supported protocols/clients/servers
+ */
+unsigned int random_port(void)
+{
+	return 1024 + (get_timer(0) % 0x4000);
+}
+#endif
+
+void ip_to_string(IPaddr_t x, char *s)
+{
+	x = ntohl(x);
+	sprintf(s, "%d.%d.%d.%d",
+		(int) ((x >> 24) & 0xff),
+		(int) ((x >> 16) & 0xff),
+		(int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
+	);
+}
+
+void VLAN_to_string(ushort x, char *s)
+{
+	x = ntohs(x);
+
+	if (x == (ushort)-1)
+		x = VLAN_NONE;
+
+	if (x == VLAN_NONE)
+		strcpy(s, "none");
+	else
+		sprintf(s, "%d", x & VLAN_IDMASK);
+}
+
+ushort string_to_VLAN(const char *s)
+{
+	ushort id;
+
+	if (s == NULL)
+		return htons(VLAN_NONE);
+
+	if (*s < '0' || *s > '9')
+		id = VLAN_NONE;
+	else
+		id = (ushort)simple_strtoul(s, NULL, 10);
+
+	return htons(id);
+}
+
+ushort getenv_VLAN(char *var)
+{
+	return string_to_VLAN(getenv(var));
+}