net.h 20.9 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733
/*
 *	LiMon Monitor (LiMon) - Network.
 *
 *	Copyright 1994 - 2000 Neil Russell.
 *	(See License)
 *	SPDX-License-Identifier:	GPL-2.0
 *
 * 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];
	phys_addr_t 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);

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))

#define ETH_FCS_LEN	4		/* Octets in the FCS		*/

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);

/**
 * compute_ip_checksum() - Compute IP checksum
 *
 * @addr:	Address to check (must be 16-bit aligned)
 * @nbytes:	Number of bytes to check (normally a multiple of 2)
 * @return 16-bit IP checksum
 */
unsigned compute_ip_checksum(const void *addr, unsigned nbytes);

/**
 * add_ip_checksums() - add two IP checksums
 *
 * @offset:	Offset of first sum (if odd we do a byte-swap)
 * @sum:	First checksum
 * @new_sum:	New checksum to add
 * @return updated 16-bit IP checksum
 */
unsigned add_ip_checksums(unsigned offset, unsigned sum, unsigned new_sum);

/**
 * ip_checksum_ok() - check if a checksum is correct
 *
 * This works by making sure the checksum sums to 0
 *
 * @addr:	Address to check (must be 16-bit aligned)
 * @nbytes:	Number of bytes to check (normally a multiple of 2)
 * @return true if the checksum matches, false if not
 */
int ip_checksum_ok(const void *addr, unsigned nbytes);

/* 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\n", 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);
}

/**
 * eth_random_addr - Generate software assigned random Ethernet address
 * @addr: Pointer to a six-byte array containing the Ethernet address
 *
 * Generate a random Ethernet address (MAC) that is not multicast
 * and has the local assigned bit set.
 */
static inline void eth_random_addr(uchar *addr)
{
	int i;
	unsigned int seed = get_timer(0);

	for (i = 0; i < 6; i++)
		addr[i] = rand_r(&seed);

	addr[0] &= 0xfe;	/* clear multicast bit */
	addr[0] |= 0x02;	/* set local assignment bit (IEEE802) */
}

/* 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__ */