xref: /openbmc/u-boot/net/net.c (revision 3ce88cd7)
1 /*
2  *	Copied from Linux Monitor (LiMon) - Networking.
3  *
4  *	Copyright 1994 - 2000 Neil Russell.
5  *	(See License)
6  *	Copyright 2000 Roland Borde
7  *	Copyright 2000 Paolo Scaffardi
8  *	Copyright 2000-2002 Wolfgang Denk, wd@denx.de
9  *	SPDX-License-Identifier:	GPL-2.0
10  */
11 
12 /*
13  * General Desription:
14  *
15  * The user interface supports commands for BOOTP, RARP, and TFTP.
16  * Also, we support ARP internally. Depending on available data,
17  * these interact as follows:
18  *
19  * BOOTP:
20  *
21  *	Prerequisites:	- own ethernet address
22  *	We want:	- own IP address
23  *			- TFTP server IP address
24  *			- name of bootfile
25  *	Next step:	ARP
26  *
27  * LINK_LOCAL:
28  *
29  *	Prerequisites:	- own ethernet address
30  *	We want:	- own IP address
31  *	Next step:	ARP
32  *
33  * RARP:
34  *
35  *	Prerequisites:	- own ethernet address
36  *	We want:	- own IP address
37  *			- TFTP server IP address
38  *	Next step:	ARP
39  *
40  * ARP:
41  *
42  *	Prerequisites:	- own ethernet address
43  *			- own IP address
44  *			- TFTP server IP address
45  *	We want:	- TFTP server ethernet address
46  *	Next step:	TFTP
47  *
48  * DHCP:
49  *
50  *     Prerequisites:	- own ethernet address
51  *     We want:		- IP, Netmask, ServerIP, Gateway IP
52  *			- bootfilename, lease time
53  *     Next step:	- TFTP
54  *
55  * TFTP:
56  *
57  *	Prerequisites:	- own ethernet address
58  *			- own IP address
59  *			- TFTP server IP address
60  *			- TFTP server ethernet address
61  *			- name of bootfile (if unknown, we use a default name
62  *			  derived from our own IP address)
63  *	We want:	- load the boot file
64  *	Next step:	none
65  *
66  * NFS:
67  *
68  *	Prerequisites:	- own ethernet address
69  *			- own IP address
70  *			- name of bootfile (if unknown, we use a default name
71  *			  derived from our own IP address)
72  *	We want:	- load the boot file
73  *	Next step:	none
74  *
75  * SNTP:
76  *
77  *	Prerequisites:	- own ethernet address
78  *			- own IP address
79  *	We want:	- network time
80  *	Next step:	none
81  */
82 
83 
84 #include <common.h>
85 #include <command.h>
86 #include <console.h>
87 #include <environment.h>
88 #include <errno.h>
89 #include <net.h>
90 #include <net/tftp.h>
91 #if defined(CONFIG_LED_STATUS)
92 #include <miiphy.h>
93 #include <status_led.h>
94 #endif
95 #include <watchdog.h>
96 #include <linux/compiler.h>
97 #include "arp.h"
98 #include "bootp.h"
99 #include "cdp.h"
100 #if defined(CONFIG_CMD_DNS)
101 #include "dns.h"
102 #endif
103 #include "link_local.h"
104 #include "nfs.h"
105 #include "ping.h"
106 #include "rarp.h"
107 #if defined(CONFIG_CMD_SNTP)
108 #include "sntp.h"
109 #endif
110 
111 /** BOOTP EXTENTIONS **/
112 
113 /* Our subnet mask (0=unknown) */
114 struct in_addr net_netmask;
115 /* Our gateways IP address */
116 struct in_addr net_gateway;
117 /* Our DNS IP address */
118 struct in_addr net_dns_server;
119 #if defined(CONFIG_BOOTP_DNS2)
120 /* Our 2nd DNS IP address */
121 struct in_addr net_dns_server2;
122 #endif
123 
124 #ifdef CONFIG_MCAST_TFTP	/* Multicast TFTP */
125 struct in_addr net_mcast_addr;
126 #endif
127 
128 /** END OF BOOTP EXTENTIONS **/
129 
130 /* Our ethernet address */
131 u8 net_ethaddr[6];
132 /* Boot server enet address */
133 u8 net_server_ethaddr[6];
134 /* Our IP addr (0 = unknown) */
135 struct in_addr	net_ip;
136 /* Server IP addr (0 = unknown) */
137 struct in_addr	net_server_ip;
138 /* Current receive packet */
139 uchar *net_rx_packet;
140 /* Current rx packet length */
141 int		net_rx_packet_len;
142 /* IP packet ID */
143 static unsigned	net_ip_id;
144 /* Ethernet bcast address */
145 const u8 net_bcast_ethaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
146 const u8 net_null_ethaddr[6];
147 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
148 void (*push_packet)(void *, int len) = 0;
149 #endif
150 /* Network loop state */
151 enum net_loop_state net_state;
152 /* Tried all network devices */
153 int		net_restart_wrap;
154 /* Network loop restarted */
155 static int	net_restarted;
156 /* At least one device configured */
157 static int	net_dev_exists;
158 
159 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
160 /* default is without VLAN */
161 ushort		net_our_vlan = 0xFFFF;
162 /* ditto */
163 ushort		net_native_vlan = 0xFFFF;
164 
165 /* Boot File name */
166 char net_boot_file_name[1024];
167 /* The actual transferred size of the bootfile (in bytes) */
168 u32 net_boot_file_size;
169 /* Boot file size in blocks as reported by the DHCP server */
170 u32 net_boot_file_expected_size_in_blocks;
171 
172 #if defined(CONFIG_CMD_SNTP)
173 /* NTP server IP address */
174 struct in_addr	net_ntp_server;
175 /* offset time from UTC */
176 int		net_ntp_time_offset;
177 #endif
178 
179 static uchar net_pkt_buf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
180 /* Receive packets */
181 uchar *net_rx_packets[PKTBUFSRX];
182 /* Current UDP RX packet handler */
183 static rxhand_f *udp_packet_handler;
184 /* Current ARP RX packet handler */
185 static rxhand_f *arp_packet_handler;
186 #ifdef CONFIG_CMD_TFTPPUT
187 /* Current ICMP rx handler */
188 static rxhand_icmp_f *packet_icmp_handler;
189 #endif
190 /* Current timeout handler */
191 static thand_f *time_handler;
192 /* Time base value */
193 static ulong	time_start;
194 /* Current timeout value */
195 static ulong	time_delta;
196 /* THE transmit packet */
197 uchar *net_tx_packet;
198 
199 static int net_check_prereq(enum proto_t protocol);
200 
201 static int net_try_count;
202 
203 int __maybe_unused net_busy_flag;
204 
205 /**********************************************************************/
206 
207 static int on_bootfile(const char *name, const char *value, enum env_op op,
208 	int flags)
209 {
210 	if (flags & H_PROGRAMMATIC)
211 		return 0;
212 
213 	switch (op) {
214 	case env_op_create:
215 	case env_op_overwrite:
216 		copy_filename(net_boot_file_name, value,
217 			      sizeof(net_boot_file_name));
218 		break;
219 	default:
220 		break;
221 	}
222 
223 	return 0;
224 }
225 U_BOOT_ENV_CALLBACK(bootfile, on_bootfile);
226 
227 static int on_ipaddr(const char *name, const char *value, enum env_op op,
228 	int flags)
229 {
230 	if (flags & H_PROGRAMMATIC)
231 		return 0;
232 
233 	net_ip = string_to_ip(value);
234 
235 	return 0;
236 }
237 U_BOOT_ENV_CALLBACK(ipaddr, on_ipaddr);
238 
239 static int on_gatewayip(const char *name, const char *value, enum env_op op,
240 	int flags)
241 {
242 	if (flags & H_PROGRAMMATIC)
243 		return 0;
244 
245 	net_gateway = string_to_ip(value);
246 
247 	return 0;
248 }
249 U_BOOT_ENV_CALLBACK(gatewayip, on_gatewayip);
250 
251 static int on_netmask(const char *name, const char *value, enum env_op op,
252 	int flags)
253 {
254 	if (flags & H_PROGRAMMATIC)
255 		return 0;
256 
257 	net_netmask = string_to_ip(value);
258 
259 	return 0;
260 }
261 U_BOOT_ENV_CALLBACK(netmask, on_netmask);
262 
263 static int on_serverip(const char *name, const char *value, enum env_op op,
264 	int flags)
265 {
266 	if (flags & H_PROGRAMMATIC)
267 		return 0;
268 
269 	net_server_ip = string_to_ip(value);
270 
271 	return 0;
272 }
273 U_BOOT_ENV_CALLBACK(serverip, on_serverip);
274 
275 static int on_nvlan(const char *name, const char *value, enum env_op op,
276 	int flags)
277 {
278 	if (flags & H_PROGRAMMATIC)
279 		return 0;
280 
281 	net_native_vlan = string_to_vlan(value);
282 
283 	return 0;
284 }
285 U_BOOT_ENV_CALLBACK(nvlan, on_nvlan);
286 
287 static int on_vlan(const char *name, const char *value, enum env_op op,
288 	int flags)
289 {
290 	if (flags & H_PROGRAMMATIC)
291 		return 0;
292 
293 	net_our_vlan = string_to_vlan(value);
294 
295 	return 0;
296 }
297 U_BOOT_ENV_CALLBACK(vlan, on_vlan);
298 
299 #if defined(CONFIG_CMD_DNS)
300 static int on_dnsip(const char *name, const char *value, enum env_op op,
301 	int flags)
302 {
303 	if (flags & H_PROGRAMMATIC)
304 		return 0;
305 
306 	net_dns_server = string_to_ip(value);
307 
308 	return 0;
309 }
310 U_BOOT_ENV_CALLBACK(dnsip, on_dnsip);
311 #endif
312 
313 /*
314  * Check if autoload is enabled. If so, use either NFS or TFTP to download
315  * the boot file.
316  */
317 void net_auto_load(void)
318 {
319 #if defined(CONFIG_CMD_NFS)
320 	const char *s = env_get("autoload");
321 
322 	if (s != NULL && strcmp(s, "NFS") == 0) {
323 		/*
324 		 * Use NFS to load the bootfile.
325 		 */
326 		nfs_start();
327 		return;
328 	}
329 #endif
330 	if (env_get_yesno("autoload") == 0) {
331 		/*
332 		 * Just use BOOTP/RARP to configure system;
333 		 * Do not use TFTP to load the bootfile.
334 		 */
335 		net_set_state(NETLOOP_SUCCESS);
336 		return;
337 	}
338 	tftp_start(TFTPGET);
339 }
340 
341 static void net_init_loop(void)
342 {
343 	if (eth_get_dev())
344 		memcpy(net_ethaddr, eth_get_ethaddr(), 6);
345 
346 	return;
347 }
348 
349 static void net_clear_handlers(void)
350 {
351 	net_set_udp_handler(NULL);
352 	net_set_arp_handler(NULL);
353 	net_set_timeout_handler(0, NULL);
354 }
355 
356 static void net_cleanup_loop(void)
357 {
358 	net_clear_handlers();
359 }
360 
361 void net_init(void)
362 {
363 	static int first_call = 1;
364 
365 	if (first_call) {
366 		/*
367 		 *	Setup packet buffers, aligned correctly.
368 		 */
369 		int i;
370 
371 		net_tx_packet = &net_pkt_buf[0] + (PKTALIGN - 1);
372 		net_tx_packet -= (ulong)net_tx_packet % PKTALIGN;
373 		for (i = 0; i < PKTBUFSRX; i++) {
374 			net_rx_packets[i] = net_tx_packet +
375 				(i + 1) * PKTSIZE_ALIGN;
376 		}
377 		arp_init();
378 		net_clear_handlers();
379 
380 		/* Only need to setup buffer pointers once. */
381 		first_call = 0;
382 	}
383 
384 	net_init_loop();
385 }
386 
387 /**********************************************************************/
388 /*
389  *	Main network processing loop.
390  */
391 
392 int net_loop(enum proto_t protocol)
393 {
394 	int ret = -EINVAL;
395 
396 	net_restarted = 0;
397 	net_dev_exists = 0;
398 	net_try_count = 1;
399 	debug_cond(DEBUG_INT_STATE, "--- net_loop Entry\n");
400 
401 	bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
402 	net_init();
403 	if (eth_is_on_demand_init() || protocol != NETCONS) {
404 		eth_halt();
405 		eth_set_current();
406 		ret = eth_init();
407 		if (ret < 0) {
408 			eth_halt();
409 			return ret;
410 		}
411 	} else {
412 		eth_init_state_only();
413 	}
414 restart:
415 #ifdef CONFIG_USB_KEYBOARD
416 	net_busy_flag = 0;
417 #endif
418 	net_set_state(NETLOOP_CONTINUE);
419 
420 	/*
421 	 *	Start the ball rolling with the given start function.  From
422 	 *	here on, this code is a state machine driven by received
423 	 *	packets and timer events.
424 	 */
425 	debug_cond(DEBUG_INT_STATE, "--- net_loop Init\n");
426 	net_init_loop();
427 
428 	switch (net_check_prereq(protocol)) {
429 	case 1:
430 		/* network not configured */
431 		eth_halt();
432 		return -ENODEV;
433 
434 	case 2:
435 		/* network device not configured */
436 		break;
437 
438 	case 0:
439 		net_dev_exists = 1;
440 		net_boot_file_size = 0;
441 		switch (protocol) {
442 		case TFTPGET:
443 #ifdef CONFIG_CMD_TFTPPUT
444 		case TFTPPUT:
445 #endif
446 			/* always use ARP to get server ethernet address */
447 			tftp_start(protocol);
448 			break;
449 #ifdef CONFIG_CMD_TFTPSRV
450 		case TFTPSRV:
451 			tftp_start_server();
452 			break;
453 #endif
454 #if defined(CONFIG_CMD_DHCP)
455 		case DHCP:
456 			bootp_reset();
457 			net_ip.s_addr = 0;
458 			dhcp_request();		/* Basically same as BOOTP */
459 			break;
460 #endif
461 
462 		case BOOTP:
463 			bootp_reset();
464 			net_ip.s_addr = 0;
465 			bootp_request();
466 			break;
467 
468 #if defined(CONFIG_CMD_RARP)
469 		case RARP:
470 			rarp_try = 0;
471 			net_ip.s_addr = 0;
472 			rarp_request();
473 			break;
474 #endif
475 #if defined(CONFIG_CMD_PING)
476 		case PING:
477 			ping_start();
478 			break;
479 #endif
480 #if defined(CONFIG_CMD_NFS)
481 		case NFS:
482 			nfs_start();
483 			break;
484 #endif
485 #if defined(CONFIG_CMD_CDP)
486 		case CDP:
487 			cdp_start();
488 			break;
489 #endif
490 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
491 		case NETCONS:
492 			nc_start();
493 			break;
494 #endif
495 #if defined(CONFIG_CMD_SNTP)
496 		case SNTP:
497 			sntp_start();
498 			break;
499 #endif
500 #if defined(CONFIG_CMD_DNS)
501 		case DNS:
502 			dns_start();
503 			break;
504 #endif
505 #if defined(CONFIG_CMD_LINK_LOCAL)
506 		case LINKLOCAL:
507 			link_local_start();
508 			break;
509 #endif
510 		default:
511 			break;
512 		}
513 
514 		break;
515 	}
516 
517 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
518 #if	defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)	&& \
519 	defined(CONFIG_LED_STATUS)			&& \
520 	defined(CONFIG_LED_STATUS_RED)
521 	/*
522 	 * Echo the inverted link state to the fault LED.
523 	 */
524 	if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
525 		status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_OFF);
526 	else
527 		status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_ON);
528 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
529 #endif /* CONFIG_MII, ... */
530 #ifdef CONFIG_USB_KEYBOARD
531 	net_busy_flag = 1;
532 #endif
533 
534 	/*
535 	 *	Main packet reception loop.  Loop receiving packets until
536 	 *	someone sets `net_state' to a state that terminates.
537 	 */
538 	for (;;) {
539 		WATCHDOG_RESET();
540 #ifdef CONFIG_SHOW_ACTIVITY
541 		show_activity(1);
542 #endif
543 		if (arp_timeout_check() > 0)
544 			time_start = get_timer(0);
545 
546 		/*
547 		 *	Check the ethernet for a new packet.  The ethernet
548 		 *	receive routine will process it.
549 		 *	Most drivers return the most recent packet size, but not
550 		 *	errors that may have happened.
551 		 */
552 		eth_rx();
553 
554 		/*
555 		 *	Abort if ctrl-c was pressed.
556 		 */
557 		if (ctrlc()) {
558 			/* cancel any ARP that may not have completed */
559 			net_arp_wait_packet_ip.s_addr = 0;
560 
561 			net_cleanup_loop();
562 			eth_halt();
563 			/* Invalidate the last protocol */
564 			eth_set_last_protocol(BOOTP);
565 
566 			puts("\nAbort\n");
567 			/* include a debug print as well incase the debug
568 			   messages are directed to stderr */
569 			debug_cond(DEBUG_INT_STATE, "--- net_loop Abort!\n");
570 			ret = -EINTR;
571 			goto done;
572 		}
573 
574 		/*
575 		 *	Check for a timeout, and run the timeout handler
576 		 *	if we have one.
577 		 */
578 		if (time_handler &&
579 		    ((get_timer(0) - time_start) > time_delta)) {
580 			thand_f *x;
581 
582 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
583 #if	defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)	&& \
584 	defined(CONFIG_LED_STATUS)			&& \
585 	defined(CONFIG_LED_STATUS_RED)
586 			/*
587 			 * Echo the inverted link state to the fault LED.
588 			 */
589 			if (miiphy_link(eth_get_dev()->name,
590 					CONFIG_SYS_FAULT_MII_ADDR))
591 				status_led_set(CONFIG_LED_STATUS_RED,
592 					       CONFIG_LED_STATUS_OFF);
593 			else
594 				status_led_set(CONFIG_LED_STATUS_RED,
595 					       CONFIG_LED_STATUS_ON);
596 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
597 #endif /* CONFIG_MII, ... */
598 			debug_cond(DEBUG_INT_STATE, "--- net_loop timeout\n");
599 			x = time_handler;
600 			time_handler = (thand_f *)0;
601 			(*x)();
602 		}
603 
604 		if (net_state == NETLOOP_FAIL)
605 			ret = net_start_again();
606 
607 		switch (net_state) {
608 		case NETLOOP_RESTART:
609 			net_restarted = 1;
610 			goto restart;
611 
612 		case NETLOOP_SUCCESS:
613 			net_cleanup_loop();
614 			if (net_boot_file_size > 0) {
615 				printf("Bytes transferred = %d (%x hex)\n",
616 				       net_boot_file_size, net_boot_file_size);
617 				env_set_hex("filesize", net_boot_file_size);
618 				env_set_hex("fileaddr", load_addr);
619 			}
620 			if (protocol != NETCONS)
621 				eth_halt();
622 			else
623 				eth_halt_state_only();
624 
625 			eth_set_last_protocol(protocol);
626 
627 			ret = net_boot_file_size;
628 			debug_cond(DEBUG_INT_STATE, "--- net_loop Success!\n");
629 			goto done;
630 
631 		case NETLOOP_FAIL:
632 			net_cleanup_loop();
633 			/* Invalidate the last protocol */
634 			eth_set_last_protocol(BOOTP);
635 			debug_cond(DEBUG_INT_STATE, "--- net_loop Fail!\n");
636 			goto done;
637 
638 		case NETLOOP_CONTINUE:
639 			continue;
640 		}
641 	}
642 
643 done:
644 #ifdef CONFIG_USB_KEYBOARD
645 	net_busy_flag = 0;
646 #endif
647 #ifdef CONFIG_CMD_TFTPPUT
648 	/* Clear out the handlers */
649 	net_set_udp_handler(NULL);
650 	net_set_icmp_handler(NULL);
651 #endif
652 	return ret;
653 }
654 
655 /**********************************************************************/
656 
657 static void start_again_timeout_handler(void)
658 {
659 	net_set_state(NETLOOP_RESTART);
660 }
661 
662 int net_start_again(void)
663 {
664 	char *nretry;
665 	int retry_forever = 0;
666 	unsigned long retrycnt = 0;
667 	int ret;
668 
669 	nretry = env_get("netretry");
670 	if (nretry) {
671 		if (!strcmp(nretry, "yes"))
672 			retry_forever = 1;
673 		else if (!strcmp(nretry, "no"))
674 			retrycnt = 0;
675 		else if (!strcmp(nretry, "once"))
676 			retrycnt = 1;
677 		else
678 			retrycnt = simple_strtoul(nretry, NULL, 0);
679 	} else {
680 		retrycnt = 0;
681 		retry_forever = 0;
682 	}
683 
684 	if ((!retry_forever) && (net_try_count > retrycnt)) {
685 		eth_halt();
686 		net_set_state(NETLOOP_FAIL);
687 		/*
688 		 * We don't provide a way for the protocol to return an error,
689 		 * but this is almost always the reason.
690 		 */
691 		return -ETIMEDOUT;
692 	}
693 
694 	net_try_count++;
695 
696 	eth_halt();
697 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
698 	eth_try_another(!net_restarted);
699 #endif
700 	ret = eth_init();
701 	if (net_restart_wrap) {
702 		net_restart_wrap = 0;
703 		if (net_dev_exists) {
704 			net_set_timeout_handler(10000UL,
705 						start_again_timeout_handler);
706 			net_set_udp_handler(NULL);
707 		} else {
708 			net_set_state(NETLOOP_FAIL);
709 		}
710 	} else {
711 		net_set_state(NETLOOP_RESTART);
712 	}
713 	return ret;
714 }
715 
716 /**********************************************************************/
717 /*
718  *	Miscelaneous bits.
719  */
720 
721 static void dummy_handler(uchar *pkt, unsigned dport,
722 			struct in_addr sip, unsigned sport,
723 			unsigned len)
724 {
725 }
726 
727 rxhand_f *net_get_udp_handler(void)
728 {
729 	return udp_packet_handler;
730 }
731 
732 void net_set_udp_handler(rxhand_f *f)
733 {
734 	debug_cond(DEBUG_INT_STATE, "--- net_loop UDP handler set (%p)\n", f);
735 	if (f == NULL)
736 		udp_packet_handler = dummy_handler;
737 	else
738 		udp_packet_handler = f;
739 }
740 
741 rxhand_f *net_get_arp_handler(void)
742 {
743 	return arp_packet_handler;
744 }
745 
746 void net_set_arp_handler(rxhand_f *f)
747 {
748 	debug_cond(DEBUG_INT_STATE, "--- net_loop ARP handler set (%p)\n", f);
749 	if (f == NULL)
750 		arp_packet_handler = dummy_handler;
751 	else
752 		arp_packet_handler = f;
753 }
754 
755 #ifdef CONFIG_CMD_TFTPPUT
756 void net_set_icmp_handler(rxhand_icmp_f *f)
757 {
758 	packet_icmp_handler = f;
759 }
760 #endif
761 
762 void net_set_timeout_handler(ulong iv, thand_f *f)
763 {
764 	if (iv == 0) {
765 		debug_cond(DEBUG_INT_STATE,
766 			   "--- net_loop timeout handler cancelled\n");
767 		time_handler = (thand_f *)0;
768 	} else {
769 		debug_cond(DEBUG_INT_STATE,
770 			   "--- net_loop timeout handler set (%p)\n", f);
771 		time_handler = f;
772 		time_start = get_timer(0);
773 		time_delta = iv * CONFIG_SYS_HZ / 1000;
774 	}
775 }
776 
777 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
778 		int payload_len)
779 {
780 	uchar *pkt;
781 	int eth_hdr_size;
782 	int pkt_hdr_size;
783 
784 	/* make sure the net_tx_packet is initialized (net_init() was called) */
785 	assert(net_tx_packet != NULL);
786 	if (net_tx_packet == NULL)
787 		return -1;
788 
789 	/* convert to new style broadcast */
790 	if (dest.s_addr == 0)
791 		dest.s_addr = 0xFFFFFFFF;
792 
793 	/* if broadcast, make the ether address a broadcast and don't do ARP */
794 	if (dest.s_addr == 0xFFFFFFFF)
795 		ether = (uchar *)net_bcast_ethaddr;
796 
797 	pkt = (uchar *)net_tx_packet;
798 
799 	eth_hdr_size = net_set_ether(pkt, ether, PROT_IP);
800 	pkt += eth_hdr_size;
801 	net_set_udp_header(pkt, dest, dport, sport, payload_len);
802 	pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
803 
804 	/* if MAC address was not discovered yet, do an ARP request */
805 	if (memcmp(ether, net_null_ethaddr, 6) == 0) {
806 		debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest);
807 
808 		/* save the ip and eth addr for the packet to send after arp */
809 		net_arp_wait_packet_ip = dest;
810 		arp_wait_packet_ethaddr = ether;
811 
812 		/* size of the waiting packet */
813 		arp_wait_tx_packet_size = pkt_hdr_size + payload_len;
814 
815 		/* and do the ARP request */
816 		arp_wait_try = 1;
817 		arp_wait_timer_start = get_timer(0);
818 		arp_request();
819 		return 1;	/* waiting */
820 	} else {
821 		debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
822 			   &dest, ether);
823 		net_send_packet(net_tx_packet, pkt_hdr_size + payload_len);
824 		return 0;	/* transmitted */
825 	}
826 }
827 
828 #ifdef CONFIG_IP_DEFRAG
829 /*
830  * This function collects fragments in a single packet, according
831  * to the algorithm in RFC815. It returns NULL or the pointer to
832  * a complete packet, in static storage
833  */
834 #ifndef CONFIG_NET_MAXDEFRAG
835 #define CONFIG_NET_MAXDEFRAG 16384
836 #endif
837 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG)
838 
839 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE)
840 
841 /*
842  * this is the packet being assembled, either data or frag control.
843  * Fragments go by 8 bytes, so this union must be 8 bytes long
844  */
845 struct hole {
846 	/* first_byte is address of this structure */
847 	u16 last_byte;	/* last byte in this hole + 1 (begin of next hole) */
848 	u16 next_hole;	/* index of next (in 8-b blocks), 0 == none */
849 	u16 prev_hole;	/* index of prev, 0 == none */
850 	u16 unused;
851 };
852 
853 static struct ip_udp_hdr *__net_defragment(struct ip_udp_hdr *ip, int *lenp)
854 {
855 	static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
856 	static u16 first_hole, total_len;
857 	struct hole *payload, *thisfrag, *h, *newh;
858 	struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff;
859 	uchar *indata = (uchar *)ip;
860 	int offset8, start, len, done = 0;
861 	u16 ip_off = ntohs(ip->ip_off);
862 
863 	/* payload starts after IP header, this fragment is in there */
864 	payload = (struct hole *)(pkt_buff + IP_HDR_SIZE);
865 	offset8 =  (ip_off & IP_OFFS);
866 	thisfrag = payload + offset8;
867 	start = offset8 * 8;
868 	len = ntohs(ip->ip_len) - IP_HDR_SIZE;
869 
870 	if (start + len > IP_MAXUDP) /* fragment extends too far */
871 		return NULL;
872 
873 	if (!total_len || localip->ip_id != ip->ip_id) {
874 		/* new (or different) packet, reset structs */
875 		total_len = 0xffff;
876 		payload[0].last_byte = ~0;
877 		payload[0].next_hole = 0;
878 		payload[0].prev_hole = 0;
879 		first_hole = 0;
880 		/* any IP header will work, copy the first we received */
881 		memcpy(localip, ip, IP_HDR_SIZE);
882 	}
883 
884 	/*
885 	 * What follows is the reassembly algorithm. We use the payload
886 	 * array as a linked list of hole descriptors, as each hole starts
887 	 * at a multiple of 8 bytes. However, last byte can be whatever value,
888 	 * so it is represented as byte count, not as 8-byte blocks.
889 	 */
890 
891 	h = payload + first_hole;
892 	while (h->last_byte < start) {
893 		if (!h->next_hole) {
894 			/* no hole that far away */
895 			return NULL;
896 		}
897 		h = payload + h->next_hole;
898 	}
899 
900 	/* last fragment may be 1..7 bytes, the "+7" forces acceptance */
901 	if (offset8 + ((len + 7) / 8) <= h - payload) {
902 		/* no overlap with holes (dup fragment?) */
903 		return NULL;
904 	}
905 
906 	if (!(ip_off & IP_FLAGS_MFRAG)) {
907 		/* no more fragmentss: truncate this (last) hole */
908 		total_len = start + len;
909 		h->last_byte = start + len;
910 	}
911 
912 	/*
913 	 * There is some overlap: fix the hole list. This code doesn't
914 	 * deal with a fragment that overlaps with two different holes
915 	 * (thus being a superset of a previously-received fragment).
916 	 */
917 
918 	if ((h >= thisfrag) && (h->last_byte <= start + len)) {
919 		/* complete overlap with hole: remove hole */
920 		if (!h->prev_hole && !h->next_hole) {
921 			/* last remaining hole */
922 			done = 1;
923 		} else if (!h->prev_hole) {
924 			/* first hole */
925 			first_hole = h->next_hole;
926 			payload[h->next_hole].prev_hole = 0;
927 		} else if (!h->next_hole) {
928 			/* last hole */
929 			payload[h->prev_hole].next_hole = 0;
930 		} else {
931 			/* in the middle of the list */
932 			payload[h->next_hole].prev_hole = h->prev_hole;
933 			payload[h->prev_hole].next_hole = h->next_hole;
934 		}
935 
936 	} else if (h->last_byte <= start + len) {
937 		/* overlaps with final part of the hole: shorten this hole */
938 		h->last_byte = start;
939 
940 	} else if (h >= thisfrag) {
941 		/* overlaps with initial part of the hole: move this hole */
942 		newh = thisfrag + (len / 8);
943 		*newh = *h;
944 		h = newh;
945 		if (h->next_hole)
946 			payload[h->next_hole].prev_hole = (h - payload);
947 		if (h->prev_hole)
948 			payload[h->prev_hole].next_hole = (h - payload);
949 		else
950 			first_hole = (h - payload);
951 
952 	} else {
953 		/* fragment sits in the middle: split the hole */
954 		newh = thisfrag + (len / 8);
955 		*newh = *h;
956 		h->last_byte = start;
957 		h->next_hole = (newh - payload);
958 		newh->prev_hole = (h - payload);
959 		if (newh->next_hole)
960 			payload[newh->next_hole].prev_hole = (newh - payload);
961 	}
962 
963 	/* finally copy this fragment and possibly return whole packet */
964 	memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len);
965 	if (!done)
966 		return NULL;
967 
968 	localip->ip_len = htons(total_len);
969 	*lenp = total_len + IP_HDR_SIZE;
970 	return localip;
971 }
972 
973 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
974 	int *lenp)
975 {
976 	u16 ip_off = ntohs(ip->ip_off);
977 	if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
978 		return ip; /* not a fragment */
979 	return __net_defragment(ip, lenp);
980 }
981 
982 #else /* !CONFIG_IP_DEFRAG */
983 
984 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
985 	int *lenp)
986 {
987 	u16 ip_off = ntohs(ip->ip_off);
988 	if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
989 		return ip; /* not a fragment */
990 	return NULL;
991 }
992 #endif
993 
994 /**
995  * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
996  * drop others.
997  *
998  * @parma ip	IP packet containing the ICMP
999  */
1000 static void receive_icmp(struct ip_udp_hdr *ip, int len,
1001 			struct in_addr src_ip, struct ethernet_hdr *et)
1002 {
1003 	struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
1004 
1005 	switch (icmph->type) {
1006 	case ICMP_REDIRECT:
1007 		if (icmph->code != ICMP_REDIR_HOST)
1008 			return;
1009 		printf(" ICMP Host Redirect to %pI4 ",
1010 		       &icmph->un.gateway);
1011 		break;
1012 	default:
1013 #if defined(CONFIG_CMD_PING)
1014 		ping_receive(et, ip, len);
1015 #endif
1016 #ifdef CONFIG_CMD_TFTPPUT
1017 		if (packet_icmp_handler)
1018 			packet_icmp_handler(icmph->type, icmph->code,
1019 					    ntohs(ip->udp_dst), src_ip,
1020 					    ntohs(ip->udp_src), icmph->un.data,
1021 					    ntohs(ip->udp_len));
1022 #endif
1023 		break;
1024 	}
1025 }
1026 
1027 void net_process_received_packet(uchar *in_packet, int len)
1028 {
1029 	struct ethernet_hdr *et;
1030 	struct ip_udp_hdr *ip;
1031 	struct in_addr dst_ip;
1032 	struct in_addr src_ip;
1033 	int eth_proto;
1034 #if defined(CONFIG_CMD_CDP)
1035 	int iscdp;
1036 #endif
1037 	ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1038 
1039 	debug_cond(DEBUG_NET_PKT, "packet received\n");
1040 
1041 	net_rx_packet = in_packet;
1042 	net_rx_packet_len = len;
1043 	et = (struct ethernet_hdr *)in_packet;
1044 
1045 	/* too small packet? */
1046 	if (len < ETHER_HDR_SIZE)
1047 		return;
1048 
1049 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
1050 	if (push_packet) {
1051 		(*push_packet)(in_packet, len);
1052 		return;
1053 	}
1054 #endif
1055 
1056 #if defined(CONFIG_CMD_CDP)
1057 	/* keep track if packet is CDP */
1058 	iscdp = is_cdp_packet(et->et_dest);
1059 #endif
1060 
1061 	myvlanid = ntohs(net_our_vlan);
1062 	if (myvlanid == (ushort)-1)
1063 		myvlanid = VLAN_NONE;
1064 	mynvlanid = ntohs(net_native_vlan);
1065 	if (mynvlanid == (ushort)-1)
1066 		mynvlanid = VLAN_NONE;
1067 
1068 	eth_proto = ntohs(et->et_protlen);
1069 
1070 	if (eth_proto < 1514) {
1071 		struct e802_hdr *et802 = (struct e802_hdr *)et;
1072 		/*
1073 		 *	Got a 802.2 packet.  Check the other protocol field.
1074 		 *	XXX VLAN over 802.2+SNAP not implemented!
1075 		 */
1076 		eth_proto = ntohs(et802->et_prot);
1077 
1078 		ip = (struct ip_udp_hdr *)(in_packet + E802_HDR_SIZE);
1079 		len -= E802_HDR_SIZE;
1080 
1081 	} else if (eth_proto != PROT_VLAN) {	/* normal packet */
1082 		ip = (struct ip_udp_hdr *)(in_packet + ETHER_HDR_SIZE);
1083 		len -= ETHER_HDR_SIZE;
1084 
1085 	} else {			/* VLAN packet */
1086 		struct vlan_ethernet_hdr *vet =
1087 			(struct vlan_ethernet_hdr *)et;
1088 
1089 		debug_cond(DEBUG_NET_PKT, "VLAN packet received\n");
1090 
1091 		/* too small packet? */
1092 		if (len < VLAN_ETHER_HDR_SIZE)
1093 			return;
1094 
1095 		/* if no VLAN active */
1096 		if ((ntohs(net_our_vlan) & VLAN_IDMASK) == VLAN_NONE
1097 #if defined(CONFIG_CMD_CDP)
1098 				&& iscdp == 0
1099 #endif
1100 				)
1101 			return;
1102 
1103 		cti = ntohs(vet->vet_tag);
1104 		vlanid = cti & VLAN_IDMASK;
1105 		eth_proto = ntohs(vet->vet_type);
1106 
1107 		ip = (struct ip_udp_hdr *)(in_packet + VLAN_ETHER_HDR_SIZE);
1108 		len -= VLAN_ETHER_HDR_SIZE;
1109 	}
1110 
1111 	debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto);
1112 
1113 #if defined(CONFIG_CMD_CDP)
1114 	if (iscdp) {
1115 		cdp_receive((uchar *)ip, len);
1116 		return;
1117 	}
1118 #endif
1119 
1120 	if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1121 		if (vlanid == VLAN_NONE)
1122 			vlanid = (mynvlanid & VLAN_IDMASK);
1123 		/* not matched? */
1124 		if (vlanid != (myvlanid & VLAN_IDMASK))
1125 			return;
1126 	}
1127 
1128 	switch (eth_proto) {
1129 	case PROT_ARP:
1130 		arp_receive(et, ip, len);
1131 		break;
1132 
1133 #ifdef CONFIG_CMD_RARP
1134 	case PROT_RARP:
1135 		rarp_receive(ip, len);
1136 		break;
1137 #endif
1138 	case PROT_IP:
1139 		debug_cond(DEBUG_NET_PKT, "Got IP\n");
1140 		/* Before we start poking the header, make sure it is there */
1141 		if (len < IP_UDP_HDR_SIZE) {
1142 			debug("len bad %d < %lu\n", len,
1143 			      (ulong)IP_UDP_HDR_SIZE);
1144 			return;
1145 		}
1146 		/* Check the packet length */
1147 		if (len < ntohs(ip->ip_len)) {
1148 			debug("len bad %d < %d\n", len, ntohs(ip->ip_len));
1149 			return;
1150 		}
1151 		len = ntohs(ip->ip_len);
1152 		debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n",
1153 			   len, ip->ip_hl_v & 0xff);
1154 
1155 		/* Can't deal with anything except IPv4 */
1156 		if ((ip->ip_hl_v & 0xf0) != 0x40)
1157 			return;
1158 		/* Can't deal with IP options (headers != 20 bytes) */
1159 		if ((ip->ip_hl_v & 0x0f) > 0x05)
1160 			return;
1161 		/* Check the Checksum of the header */
1162 		if (!ip_checksum_ok((uchar *)ip, IP_HDR_SIZE)) {
1163 			debug("checksum bad\n");
1164 			return;
1165 		}
1166 		/* If it is not for us, ignore it */
1167 		dst_ip = net_read_ip(&ip->ip_dst);
1168 		if (net_ip.s_addr && dst_ip.s_addr != net_ip.s_addr &&
1169 		    dst_ip.s_addr != 0xFFFFFFFF) {
1170 #ifdef CONFIG_MCAST_TFTP
1171 			if (net_mcast_addr != dst_ip)
1172 #endif
1173 				return;
1174 		}
1175 		/* Read source IP address for later use */
1176 		src_ip = net_read_ip(&ip->ip_src);
1177 		/*
1178 		 * The function returns the unchanged packet if it's not
1179 		 * a fragment, and either the complete packet or NULL if
1180 		 * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1181 		 */
1182 		ip = net_defragment(ip, &len);
1183 		if (!ip)
1184 			return;
1185 		/*
1186 		 * watch for ICMP host redirects
1187 		 *
1188 		 * There is no real handler code (yet). We just watch
1189 		 * for ICMP host redirect messages. In case anybody
1190 		 * sees these messages: please contact me
1191 		 * (wd@denx.de), or - even better - send me the
1192 		 * necessary fixes :-)
1193 		 *
1194 		 * Note: in all cases where I have seen this so far
1195 		 * it was a problem with the router configuration,
1196 		 * for instance when a router was configured in the
1197 		 * BOOTP reply, but the TFTP server was on the same
1198 		 * subnet. So this is probably a warning that your
1199 		 * configuration might be wrong. But I'm not really
1200 		 * sure if there aren't any other situations.
1201 		 *
1202 		 * Simon Glass <sjg@chromium.org>: We get an ICMP when
1203 		 * we send a tftp packet to a dead connection, or when
1204 		 * there is no server at the other end.
1205 		 */
1206 		if (ip->ip_p == IPPROTO_ICMP) {
1207 			receive_icmp(ip, len, src_ip, et);
1208 			return;
1209 		} else if (ip->ip_p != IPPROTO_UDP) {	/* Only UDP packets */
1210 			return;
1211 		}
1212 
1213 		debug_cond(DEBUG_DEV_PKT,
1214 			   "received UDP (to=%pI4, from=%pI4, len=%d)\n",
1215 			   &dst_ip, &src_ip, len);
1216 
1217 #ifdef CONFIG_UDP_CHECKSUM
1218 		if (ip->udp_xsum != 0) {
1219 			ulong   xsum;
1220 			ushort *sumptr;
1221 			ushort  sumlen;
1222 
1223 			xsum  = ip->ip_p;
1224 			xsum += (ntohs(ip->udp_len));
1225 			xsum += (ntohl(ip->ip_src.s_addr) >> 16) & 0x0000ffff;
1226 			xsum += (ntohl(ip->ip_src.s_addr) >>  0) & 0x0000ffff;
1227 			xsum += (ntohl(ip->ip_dst.s_addr) >> 16) & 0x0000ffff;
1228 			xsum += (ntohl(ip->ip_dst.s_addr) >>  0) & 0x0000ffff;
1229 
1230 			sumlen = ntohs(ip->udp_len);
1231 			sumptr = (ushort *)&(ip->udp_src);
1232 
1233 			while (sumlen > 1) {
1234 				ushort sumdata;
1235 
1236 				sumdata = *sumptr++;
1237 				xsum += ntohs(sumdata);
1238 				sumlen -= 2;
1239 			}
1240 			if (sumlen > 0) {
1241 				ushort sumdata;
1242 
1243 				sumdata = *(unsigned char *)sumptr;
1244 				sumdata = (sumdata << 8) & 0xff00;
1245 				xsum += sumdata;
1246 			}
1247 			while ((xsum >> 16) != 0) {
1248 				xsum = (xsum & 0x0000ffff) +
1249 				       ((xsum >> 16) & 0x0000ffff);
1250 			}
1251 			if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1252 				printf(" UDP wrong checksum %08lx %08x\n",
1253 				       xsum, ntohs(ip->udp_xsum));
1254 				return;
1255 			}
1256 		}
1257 #endif
1258 
1259 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
1260 		nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
1261 				src_ip,
1262 				ntohs(ip->udp_dst),
1263 				ntohs(ip->udp_src),
1264 				ntohs(ip->udp_len) - UDP_HDR_SIZE);
1265 #endif
1266 		/*
1267 		 * IP header OK.  Pass the packet to the current handler.
1268 		 */
1269 		(*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE,
1270 				      ntohs(ip->udp_dst),
1271 				      src_ip,
1272 				      ntohs(ip->udp_src),
1273 				      ntohs(ip->udp_len) - UDP_HDR_SIZE);
1274 		break;
1275 	}
1276 }
1277 
1278 /**********************************************************************/
1279 
1280 static int net_check_prereq(enum proto_t protocol)
1281 {
1282 	switch (protocol) {
1283 		/* Fall through */
1284 #if defined(CONFIG_CMD_PING)
1285 	case PING:
1286 		if (net_ping_ip.s_addr == 0) {
1287 			puts("*** ERROR: ping address not given\n");
1288 			return 1;
1289 		}
1290 		goto common;
1291 #endif
1292 #if defined(CONFIG_CMD_SNTP)
1293 	case SNTP:
1294 		if (net_ntp_server.s_addr == 0) {
1295 			puts("*** ERROR: NTP server address not given\n");
1296 			return 1;
1297 		}
1298 		goto common;
1299 #endif
1300 #if defined(CONFIG_CMD_DNS)
1301 	case DNS:
1302 		if (net_dns_server.s_addr == 0) {
1303 			puts("*** ERROR: DNS server address not given\n");
1304 			return 1;
1305 		}
1306 		goto common;
1307 #endif
1308 #if defined(CONFIG_CMD_NFS)
1309 	case NFS:
1310 #endif
1311 		/* Fall through */
1312 	case TFTPGET:
1313 	case TFTPPUT:
1314 		if (net_server_ip.s_addr == 0) {
1315 			puts("*** ERROR: `serverip' not set\n");
1316 			return 1;
1317 		}
1318 #if	defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
1319 	defined(CONFIG_CMD_DNS)
1320 common:
1321 #endif
1322 		/* Fall through */
1323 
1324 	case NETCONS:
1325 	case TFTPSRV:
1326 		if (net_ip.s_addr == 0) {
1327 			puts("*** ERROR: `ipaddr' not set\n");
1328 			return 1;
1329 		}
1330 		/* Fall through */
1331 
1332 #ifdef CONFIG_CMD_RARP
1333 	case RARP:
1334 #endif
1335 	case BOOTP:
1336 	case CDP:
1337 	case DHCP:
1338 	case LINKLOCAL:
1339 		if (memcmp(net_ethaddr, "\0\0\0\0\0\0", 6) == 0) {
1340 			int num = eth_get_dev_index();
1341 
1342 			switch (num) {
1343 			case -1:
1344 				puts("*** ERROR: No ethernet found.\n");
1345 				return 1;
1346 			case 0:
1347 				puts("*** ERROR: `ethaddr' not set\n");
1348 				break;
1349 			default:
1350 				printf("*** ERROR: `eth%daddr' not set\n",
1351 				       num);
1352 				break;
1353 			}
1354 
1355 			net_start_again();
1356 			return 2;
1357 		}
1358 		/* Fall through */
1359 	default:
1360 		return 0;
1361 	}
1362 	return 0;		/* OK */
1363 }
1364 /**********************************************************************/
1365 
1366 int
1367 net_eth_hdr_size(void)
1368 {
1369 	ushort myvlanid;
1370 
1371 	myvlanid = ntohs(net_our_vlan);
1372 	if (myvlanid == (ushort)-1)
1373 		myvlanid = VLAN_NONE;
1374 
1375 	return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1376 		VLAN_ETHER_HDR_SIZE;
1377 }
1378 
1379 int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot)
1380 {
1381 	struct ethernet_hdr *et = (struct ethernet_hdr *)xet;
1382 	ushort myvlanid;
1383 
1384 	myvlanid = ntohs(net_our_vlan);
1385 	if (myvlanid == (ushort)-1)
1386 		myvlanid = VLAN_NONE;
1387 
1388 	memcpy(et->et_dest, dest_ethaddr, 6);
1389 	memcpy(et->et_src, net_ethaddr, 6);
1390 	if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1391 		et->et_protlen = htons(prot);
1392 		return ETHER_HDR_SIZE;
1393 	} else {
1394 		struct vlan_ethernet_hdr *vet =
1395 			(struct vlan_ethernet_hdr *)xet;
1396 
1397 		vet->vet_vlan_type = htons(PROT_VLAN);
1398 		vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1399 		vet->vet_type = htons(prot);
1400 		return VLAN_ETHER_HDR_SIZE;
1401 	}
1402 }
1403 
1404 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
1405 {
1406 	ushort protlen;
1407 
1408 	memcpy(et->et_dest, addr, 6);
1409 	memcpy(et->et_src, net_ethaddr, 6);
1410 	protlen = ntohs(et->et_protlen);
1411 	if (protlen == PROT_VLAN) {
1412 		struct vlan_ethernet_hdr *vet =
1413 			(struct vlan_ethernet_hdr *)et;
1414 		vet->vet_type = htons(prot);
1415 		return VLAN_ETHER_HDR_SIZE;
1416 	} else if (protlen > 1514) {
1417 		et->et_protlen = htons(prot);
1418 		return ETHER_HDR_SIZE;
1419 	} else {
1420 		/* 802.2 + SNAP */
1421 		struct e802_hdr *et802 = (struct e802_hdr *)et;
1422 		et802->et_prot = htons(prot);
1423 		return E802_HDR_SIZE;
1424 	}
1425 }
1426 
1427 void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source)
1428 {
1429 	struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1430 
1431 	/*
1432 	 *	Construct an IP header.
1433 	 */
1434 	/* IP_HDR_SIZE / 4 (not including UDP) */
1435 	ip->ip_hl_v  = 0x45;
1436 	ip->ip_tos   = 0;
1437 	ip->ip_len   = htons(IP_HDR_SIZE);
1438 	ip->ip_id    = htons(net_ip_id++);
1439 	ip->ip_off   = htons(IP_FLAGS_DFRAG);	/* Don't fragment */
1440 	ip->ip_ttl   = 255;
1441 	ip->ip_sum   = 0;
1442 	/* already in network byte order */
1443 	net_copy_ip((void *)&ip->ip_src, &source);
1444 	/* already in network byte order */
1445 	net_copy_ip((void *)&ip->ip_dst, &dest);
1446 }
1447 
1448 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport,
1449 			int len)
1450 {
1451 	struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1452 
1453 	/*
1454 	 *	If the data is an odd number of bytes, zero the
1455 	 *	byte after the last byte so that the checksum
1456 	 *	will work.
1457 	 */
1458 	if (len & 1)
1459 		pkt[IP_UDP_HDR_SIZE + len] = 0;
1460 
1461 	net_set_ip_header(pkt, dest, net_ip);
1462 	ip->ip_len   = htons(IP_UDP_HDR_SIZE + len);
1463 	ip->ip_p     = IPPROTO_UDP;
1464 	ip->ip_sum   = compute_ip_checksum(ip, IP_HDR_SIZE);
1465 
1466 	ip->udp_src  = htons(sport);
1467 	ip->udp_dst  = htons(dport);
1468 	ip->udp_len  = htons(UDP_HDR_SIZE + len);
1469 	ip->udp_xsum = 0;
1470 }
1471 
1472 void copy_filename(char *dst, const char *src, int size)
1473 {
1474 	if (*src && (*src == '"')) {
1475 		++src;
1476 		--size;
1477 	}
1478 
1479 	while ((--size > 0) && *src && (*src != '"'))
1480 		*dst++ = *src++;
1481 	*dst = '\0';
1482 }
1483 
1484 #if	defined(CONFIG_CMD_NFS)		|| \
1485 	defined(CONFIG_CMD_SNTP)	|| \
1486 	defined(CONFIG_CMD_DNS)
1487 /*
1488  * make port a little random (1024-17407)
1489  * This keeps the math somewhat trivial to compute, and seems to work with
1490  * all supported protocols/clients/servers
1491  */
1492 unsigned int random_port(void)
1493 {
1494 	return 1024 + (get_timer(0) % 0x4000);
1495 }
1496 #endif
1497 
1498 void ip_to_string(struct in_addr x, char *s)
1499 {
1500 	x.s_addr = ntohl(x.s_addr);
1501 	sprintf(s, "%d.%d.%d.%d",
1502 		(int) ((x.s_addr >> 24) & 0xff),
1503 		(int) ((x.s_addr >> 16) & 0xff),
1504 		(int) ((x.s_addr >> 8) & 0xff),
1505 		(int) ((x.s_addr >> 0) & 0xff)
1506 	);
1507 }
1508 
1509 void vlan_to_string(ushort x, char *s)
1510 {
1511 	x = ntohs(x);
1512 
1513 	if (x == (ushort)-1)
1514 		x = VLAN_NONE;
1515 
1516 	if (x == VLAN_NONE)
1517 		strcpy(s, "none");
1518 	else
1519 		sprintf(s, "%d", x & VLAN_IDMASK);
1520 }
1521 
1522 ushort string_to_vlan(const char *s)
1523 {
1524 	ushort id;
1525 
1526 	if (s == NULL)
1527 		return htons(VLAN_NONE);
1528 
1529 	if (*s < '0' || *s > '9')
1530 		id = VLAN_NONE;
1531 	else
1532 		id = (ushort)simple_strtoul(s, NULL, 10);
1533 
1534 	return htons(id);
1535 }
1536 
1537 ushort env_get_vlan(char *var)
1538 {
1539 	return string_to_vlan(env_get(var));
1540 }
1541