xref: /openbmc/u-boot/net/net.c (revision efe2d80c)
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_STATUS_LED)
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 DECLARE_GLOBAL_DATA_PTR;
112 
113 /** BOOTP EXTENTIONS **/
114 
115 /* Our subnet mask (0=unknown) */
116 struct in_addr net_netmask;
117 /* Our gateways IP address */
118 struct in_addr net_gateway;
119 /* Our DNS IP address */
120 struct in_addr net_dns_server;
121 #if defined(CONFIG_BOOTP_DNS2)
122 /* Our 2nd DNS IP address */
123 struct in_addr net_dns_server2;
124 #endif
125 
126 #ifdef CONFIG_MCAST_TFTP	/* Multicast TFTP */
127 struct in_addr net_mcast_addr;
128 #endif
129 
130 /** END OF BOOTP EXTENTIONS **/
131 
132 /* Our ethernet address */
133 u8 net_ethaddr[6];
134 /* Boot server enet address */
135 u8 net_server_ethaddr[6];
136 /* Our IP addr (0 = unknown) */
137 struct in_addr	net_ip;
138 /* Server IP addr (0 = unknown) */
139 struct in_addr	net_server_ip;
140 /* Current receive packet */
141 uchar *net_rx_packet;
142 /* Current rx packet length */
143 int		net_rx_packet_len;
144 /* IP packet ID */
145 static unsigned	net_ip_id;
146 /* Ethernet bcast address */
147 const u8 net_bcast_ethaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
148 const u8 net_null_ethaddr[6];
149 #ifdef CONFIG_API
150 void (*push_packet)(void *, int len) = 0;
151 #endif
152 /* Network loop state */
153 enum net_loop_state net_state;
154 /* Tried all network devices */
155 int		net_restart_wrap;
156 /* Network loop restarted */
157 static int	net_restarted;
158 /* At least one device configured */
159 static int	net_dev_exists;
160 
161 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
162 /* default is without VLAN */
163 ushort		net_our_vlan = 0xFFFF;
164 /* ditto */
165 ushort		net_native_vlan = 0xFFFF;
166 
167 /* Boot File name */
168 char net_boot_file_name[1024];
169 /* The actual transferred size of the bootfile (in bytes) */
170 u32 net_boot_file_size;
171 /* Boot file size in blocks as reported by the DHCP server */
172 u32 net_boot_file_expected_size_in_blocks;
173 
174 #if defined(CONFIG_CMD_SNTP)
175 /* NTP server IP address */
176 struct in_addr	net_ntp_server;
177 /* offset time from UTC */
178 int		net_ntp_time_offset;
179 #endif
180 
181 static uchar net_pkt_buf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
182 /* Receive packets */
183 uchar *net_rx_packets[PKTBUFSRX];
184 /* Current UDP RX packet handler */
185 static rxhand_f *udp_packet_handler;
186 /* Current ARP RX packet handler */
187 static rxhand_f *arp_packet_handler;
188 #ifdef CONFIG_CMD_TFTPPUT
189 /* Current ICMP rx handler */
190 static rxhand_icmp_f *packet_icmp_handler;
191 #endif
192 /* Current timeout handler */
193 static thand_f *time_handler;
194 /* Time base value */
195 static ulong	time_start;
196 /* Current timeout value */
197 static ulong	time_delta;
198 /* THE transmit packet */
199 uchar *net_tx_packet;
200 
201 static int net_check_prereq(enum proto_t protocol);
202 
203 static int net_try_count;
204 
205 int __maybe_unused net_busy_flag;
206 
207 /**********************************************************************/
208 
209 static int on_bootfile(const char *name, const char *value, enum env_op op,
210 	int flags)
211 {
212 	if (flags & H_PROGRAMMATIC)
213 		return 0;
214 
215 	switch (op) {
216 	case env_op_create:
217 	case env_op_overwrite:
218 		copy_filename(net_boot_file_name, value,
219 			      sizeof(net_boot_file_name));
220 		break;
221 	default:
222 		break;
223 	}
224 
225 	return 0;
226 }
227 U_BOOT_ENV_CALLBACK(bootfile, on_bootfile);
228 
229 static int on_ipaddr(const char *name, const char *value, enum env_op op,
230 	int flags)
231 {
232 	if (flags & H_PROGRAMMATIC)
233 		return 0;
234 
235 	net_ip = string_to_ip(value);
236 
237 	return 0;
238 }
239 U_BOOT_ENV_CALLBACK(ipaddr, on_ipaddr);
240 
241 static int on_gatewayip(const char *name, const char *value, enum env_op op,
242 	int flags)
243 {
244 	if (flags & H_PROGRAMMATIC)
245 		return 0;
246 
247 	net_gateway = string_to_ip(value);
248 
249 	return 0;
250 }
251 U_BOOT_ENV_CALLBACK(gatewayip, on_gatewayip);
252 
253 static int on_netmask(const char *name, const char *value, enum env_op op,
254 	int flags)
255 {
256 	if (flags & H_PROGRAMMATIC)
257 		return 0;
258 
259 	net_netmask = string_to_ip(value);
260 
261 	return 0;
262 }
263 U_BOOT_ENV_CALLBACK(netmask, on_netmask);
264 
265 static int on_serverip(const char *name, const char *value, enum env_op op,
266 	int flags)
267 {
268 	if (flags & H_PROGRAMMATIC)
269 		return 0;
270 
271 	net_server_ip = string_to_ip(value);
272 
273 	return 0;
274 }
275 U_BOOT_ENV_CALLBACK(serverip, on_serverip);
276 
277 static int on_nvlan(const char *name, const char *value, enum env_op op,
278 	int flags)
279 {
280 	if (flags & H_PROGRAMMATIC)
281 		return 0;
282 
283 	net_native_vlan = string_to_vlan(value);
284 
285 	return 0;
286 }
287 U_BOOT_ENV_CALLBACK(nvlan, on_nvlan);
288 
289 static int on_vlan(const char *name, const char *value, enum env_op op,
290 	int flags)
291 {
292 	if (flags & H_PROGRAMMATIC)
293 		return 0;
294 
295 	net_our_vlan = string_to_vlan(value);
296 
297 	return 0;
298 }
299 U_BOOT_ENV_CALLBACK(vlan, on_vlan);
300 
301 #if defined(CONFIG_CMD_DNS)
302 static int on_dnsip(const char *name, const char *value, enum env_op op,
303 	int flags)
304 {
305 	if (flags & H_PROGRAMMATIC)
306 		return 0;
307 
308 	net_dns_server = string_to_ip(value);
309 
310 	return 0;
311 }
312 U_BOOT_ENV_CALLBACK(dnsip, on_dnsip);
313 #endif
314 
315 /*
316  * Check if autoload is enabled. If so, use either NFS or TFTP to download
317  * the boot file.
318  */
319 void net_auto_load(void)
320 {
321 #if defined(CONFIG_CMD_NFS)
322 	const char *s = getenv("autoload");
323 
324 	if (s != NULL && strcmp(s, "NFS") == 0) {
325 		/*
326 		 * Use NFS to load the bootfile.
327 		 */
328 		nfs_start();
329 		return;
330 	}
331 #endif
332 	if (getenv_yesno("autoload") == 0) {
333 		/*
334 		 * Just use BOOTP/RARP to configure system;
335 		 * Do not use TFTP to load the bootfile.
336 		 */
337 		net_set_state(NETLOOP_SUCCESS);
338 		return;
339 	}
340 	tftp_start(TFTPGET);
341 }
342 
343 static void net_init_loop(void)
344 {
345 	if (eth_get_dev())
346 		memcpy(net_ethaddr, eth_get_ethaddr(), 6);
347 
348 	return;
349 }
350 
351 static void net_clear_handlers(void)
352 {
353 	net_set_udp_handler(NULL);
354 	net_set_arp_handler(NULL);
355 	net_set_timeout_handler(0, NULL);
356 }
357 
358 static void net_cleanup_loop(void)
359 {
360 	net_clear_handlers();
361 }
362 
363 void net_init(void)
364 {
365 	static int first_call = 1;
366 
367 	if (first_call) {
368 		/*
369 		 *	Setup packet buffers, aligned correctly.
370 		 */
371 		int i;
372 
373 		net_tx_packet = &net_pkt_buf[0] + (PKTALIGN - 1);
374 		net_tx_packet -= (ulong)net_tx_packet % PKTALIGN;
375 		for (i = 0; i < PKTBUFSRX; i++) {
376 			net_rx_packets[i] = net_tx_packet +
377 				(i + 1) * PKTSIZE_ALIGN;
378 		}
379 		arp_init();
380 		net_clear_handlers();
381 
382 		/* Only need to setup buffer pointers once. */
383 		first_call = 0;
384 	}
385 
386 	net_init_loop();
387 }
388 
389 /**********************************************************************/
390 /*
391  *	Main network processing loop.
392  */
393 
394 int net_loop(enum proto_t protocol)
395 {
396 	int ret = -EINVAL;
397 
398 	net_restarted = 0;
399 	net_dev_exists = 0;
400 	net_try_count = 1;
401 	debug_cond(DEBUG_INT_STATE, "--- net_loop Entry\n");
402 
403 	bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
404 	net_init();
405 	if (eth_is_on_demand_init() || protocol != NETCONS) {
406 		eth_halt();
407 		eth_set_current();
408 		ret = eth_init();
409 		if (ret < 0) {
410 			eth_halt();
411 			return ret;
412 		}
413 	} else {
414 		eth_init_state_only();
415 	}
416 restart:
417 #ifdef CONFIG_USB_KEYBOARD
418 	net_busy_flag = 0;
419 #endif
420 	net_set_state(NETLOOP_CONTINUE);
421 
422 	/*
423 	 *	Start the ball rolling with the given start function.  From
424 	 *	here on, this code is a state machine driven by received
425 	 *	packets and timer events.
426 	 */
427 	debug_cond(DEBUG_INT_STATE, "--- net_loop Init\n");
428 	net_init_loop();
429 
430 	switch (net_check_prereq(protocol)) {
431 	case 1:
432 		/* network not configured */
433 		eth_halt();
434 		return -ENODEV;
435 
436 	case 2:
437 		/* network device not configured */
438 		break;
439 
440 	case 0:
441 		net_dev_exists = 1;
442 		net_boot_file_size = 0;
443 		switch (protocol) {
444 		case TFTPGET:
445 #ifdef CONFIG_CMD_TFTPPUT
446 		case TFTPPUT:
447 #endif
448 			/* always use ARP to get server ethernet address */
449 			tftp_start(protocol);
450 			break;
451 #ifdef CONFIG_CMD_TFTPSRV
452 		case TFTPSRV:
453 			tftp_start_server();
454 			break;
455 #endif
456 #if defined(CONFIG_CMD_DHCP)
457 		case DHCP:
458 			bootp_reset();
459 			net_ip.s_addr = 0;
460 			dhcp_request();		/* Basically same as BOOTP */
461 			break;
462 #endif
463 
464 		case BOOTP:
465 			bootp_reset();
466 			net_ip.s_addr = 0;
467 			bootp_request();
468 			break;
469 
470 #if defined(CONFIG_CMD_RARP)
471 		case RARP:
472 			rarp_try = 0;
473 			net_ip.s_addr = 0;
474 			rarp_request();
475 			break;
476 #endif
477 #if defined(CONFIG_CMD_PING)
478 		case PING:
479 			ping_start();
480 			break;
481 #endif
482 #if defined(CONFIG_CMD_NFS)
483 		case NFS:
484 			nfs_start();
485 			break;
486 #endif
487 #if defined(CONFIG_CMD_CDP)
488 		case CDP:
489 			cdp_start();
490 			break;
491 #endif
492 #if defined(CONFIG_NETCONSOLE) && !(CONFIG_SPL_BUILD)
493 		case NETCONS:
494 			nc_start();
495 			break;
496 #endif
497 #if defined(CONFIG_CMD_SNTP)
498 		case SNTP:
499 			sntp_start();
500 			break;
501 #endif
502 #if defined(CONFIG_CMD_DNS)
503 		case DNS:
504 			dns_start();
505 			break;
506 #endif
507 #if defined(CONFIG_CMD_LINK_LOCAL)
508 		case LINKLOCAL:
509 			link_local_start();
510 			break;
511 #endif
512 		default:
513 			break;
514 		}
515 
516 		break;
517 	}
518 
519 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
520 #if	defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)	&& \
521 	defined(CONFIG_STATUS_LED)			&& \
522 	defined(STATUS_LED_RED)
523 	/*
524 	 * Echo the inverted link state to the fault LED.
525 	 */
526 	if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
527 		status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
528 	else
529 		status_led_set(STATUS_LED_RED, STATUS_LED_ON);
530 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
531 #endif /* CONFIG_MII, ... */
532 #ifdef CONFIG_USB_KEYBOARD
533 	net_busy_flag = 1;
534 #endif
535 
536 	/*
537 	 *	Main packet reception loop.  Loop receiving packets until
538 	 *	someone sets `net_state' to a state that terminates.
539 	 */
540 	for (;;) {
541 		WATCHDOG_RESET();
542 #ifdef CONFIG_SHOW_ACTIVITY
543 		show_activity(1);
544 #endif
545 		/*
546 		 *	Check the ethernet for a new packet.  The ethernet
547 		 *	receive routine will process it.
548 		 *	Most drivers return the most recent packet size, but not
549 		 *	errors that may have happened.
550 		 */
551 		eth_rx();
552 
553 		/*
554 		 *	Abort if ctrl-c was pressed.
555 		 */
556 		if (ctrlc()) {
557 			/* cancel any ARP that may not have completed */
558 			net_arp_wait_packet_ip.s_addr = 0;
559 
560 			net_cleanup_loop();
561 			eth_halt();
562 			/* Invalidate the last protocol */
563 			eth_set_last_protocol(BOOTP);
564 
565 			puts("\nAbort\n");
566 			/* include a debug print as well incase the debug
567 			   messages are directed to stderr */
568 			debug_cond(DEBUG_INT_STATE, "--- net_loop Abort!\n");
569 			ret = -EINTR;
570 			goto done;
571 		}
572 
573 		if (arp_timeout_check() > 0) {
574 		    time_start = get_timer(0);
575 		}
576 
577 		/*
578 		 *	Check for a timeout, and run the timeout handler
579 		 *	if we have one.
580 		 */
581 		if (time_handler &&
582 		    ((get_timer(0) - time_start) > time_delta)) {
583 			thand_f *x;
584 
585 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
586 #if	defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)	&& \
587 	defined(CONFIG_STATUS_LED)			&& \
588 	defined(STATUS_LED_RED)
589 			/*
590 			 * Echo the inverted link state to the fault LED.
591 			 */
592 			if (miiphy_link(eth_get_dev()->name,
593 					CONFIG_SYS_FAULT_MII_ADDR))
594 				status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
595 			else
596 				status_led_set(STATUS_LED_RED, STATUS_LED_ON);
597 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
598 #endif /* CONFIG_MII, ... */
599 			debug_cond(DEBUG_INT_STATE, "--- net_loop timeout\n");
600 			x = time_handler;
601 			time_handler = (thand_f *)0;
602 			(*x)();
603 		}
604 
605 		if (net_state == NETLOOP_FAIL)
606 			ret = net_start_again();
607 
608 		switch (net_state) {
609 		case NETLOOP_RESTART:
610 			net_restarted = 1;
611 			goto restart;
612 
613 		case NETLOOP_SUCCESS:
614 			net_cleanup_loop();
615 			if (net_boot_file_size > 0) {
616 				printf("Bytes transferred = %d (%x hex)\n",
617 				       net_boot_file_size, net_boot_file_size);
618 				setenv_hex("filesize", net_boot_file_size);
619 				setenv_hex("fileaddr", load_addr);
620 			}
621 			if (protocol != NETCONS)
622 				eth_halt();
623 			else
624 				eth_halt_state_only();
625 
626 			eth_set_last_protocol(protocol);
627 
628 			ret = net_boot_file_size;
629 			debug_cond(DEBUG_INT_STATE, "--- net_loop Success!\n");
630 			goto done;
631 
632 		case NETLOOP_FAIL:
633 			net_cleanup_loop();
634 			/* Invalidate the last protocol */
635 			eth_set_last_protocol(BOOTP);
636 			debug_cond(DEBUG_INT_STATE, "--- net_loop Fail!\n");
637 			goto done;
638 
639 		case NETLOOP_CONTINUE:
640 			continue;
641 		}
642 	}
643 
644 done:
645 #ifdef CONFIG_USB_KEYBOARD
646 	net_busy_flag = 0;
647 #endif
648 #ifdef CONFIG_CMD_TFTPPUT
649 	/* Clear out the handlers */
650 	net_set_udp_handler(NULL);
651 	net_set_icmp_handler(NULL);
652 #endif
653 	return ret;
654 }
655 
656 /**********************************************************************/
657 
658 static void start_again_timeout_handler(void)
659 {
660 	net_set_state(NETLOOP_RESTART);
661 }
662 
663 int net_start_again(void)
664 {
665 	char *nretry;
666 	int retry_forever = 0;
667 	unsigned long retrycnt = 0;
668 	int ret;
669 
670 	nretry = getenv("netretry");
671 	if (nretry) {
672 		if (!strcmp(nretry, "yes"))
673 			retry_forever = 1;
674 		else if (!strcmp(nretry, "no"))
675 			retrycnt = 0;
676 		else if (!strcmp(nretry, "once"))
677 			retrycnt = 1;
678 		else
679 			retrycnt = simple_strtoul(nretry, NULL, 0);
680 	} else {
681 		retrycnt = 0;
682 		retry_forever = 0;
683 	}
684 
685 	if ((!retry_forever) && (net_try_count >= retrycnt)) {
686 		eth_halt();
687 		net_set_state(NETLOOP_FAIL);
688 		/*
689 		 * We don't provide a way for the protocol to return an error,
690 		 * but this is almost always the reason.
691 		 */
692 		return -ETIMEDOUT;
693 	}
694 
695 	net_try_count++;
696 
697 	eth_halt();
698 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
699 	eth_try_another(!net_restarted);
700 #endif
701 	ret = eth_init();
702 	if (net_restart_wrap) {
703 		net_restart_wrap = 0;
704 		if (net_dev_exists) {
705 			net_set_timeout_handler(10000UL,
706 						start_again_timeout_handler);
707 			net_set_udp_handler(NULL);
708 		} else {
709 			net_set_state(NETLOOP_FAIL);
710 		}
711 	} else {
712 		net_set_state(NETLOOP_RESTART);
713 	}
714 	return ret;
715 }
716 
717 /**********************************************************************/
718 /*
719  *	Miscelaneous bits.
720  */
721 
722 static void dummy_handler(uchar *pkt, unsigned dport,
723 			struct in_addr sip, unsigned sport,
724 			unsigned len)
725 {
726 }
727 
728 rxhand_f *net_get_udp_handler(void)
729 {
730 	return udp_packet_handler;
731 }
732 
733 void net_set_udp_handler(rxhand_f *f)
734 {
735 	debug_cond(DEBUG_INT_STATE, "--- net_loop UDP handler set (%p)\n", f);
736 	if (f == NULL)
737 		udp_packet_handler = dummy_handler;
738 	else
739 		udp_packet_handler = f;
740 }
741 
742 rxhand_f *net_get_arp_handler(void)
743 {
744 	return arp_packet_handler;
745 }
746 
747 void net_set_arp_handler(rxhand_f *f)
748 {
749 	debug_cond(DEBUG_INT_STATE, "--- net_loop ARP handler set (%p)\n", f);
750 	if (f == NULL)
751 		arp_packet_handler = dummy_handler;
752 	else
753 		arp_packet_handler = f;
754 }
755 
756 #ifdef CONFIG_CMD_TFTPPUT
757 void net_set_icmp_handler(rxhand_icmp_f *f)
758 {
759 	packet_icmp_handler = f;
760 }
761 #endif
762 
763 void net_set_timeout_handler(ulong iv, thand_f *f)
764 {
765 	if (iv == 0) {
766 		debug_cond(DEBUG_INT_STATE,
767 			   "--- net_loop timeout handler cancelled\n");
768 		time_handler = (thand_f *)0;
769 	} else {
770 		debug_cond(DEBUG_INT_STATE,
771 			   "--- net_loop timeout handler set (%p)\n", f);
772 		time_handler = f;
773 		time_start = get_timer(0);
774 		time_delta = iv * CONFIG_SYS_HZ / 1000;
775 	}
776 }
777 
778 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
779 		int payload_len)
780 {
781 	uchar *pkt;
782 	int eth_hdr_size;
783 	int pkt_hdr_size;
784 
785 	/* make sure the net_tx_packet is initialized (net_init() was called) */
786 	assert(net_tx_packet != NULL);
787 	if (net_tx_packet == NULL)
788 		return -1;
789 
790 	/* convert to new style broadcast */
791 	if (dest.s_addr == 0)
792 		dest.s_addr = 0xFFFFFFFF;
793 
794 	/* if broadcast, make the ether address a broadcast and don't do ARP */
795 	if (dest.s_addr == 0xFFFFFFFF)
796 		ether = (uchar *)net_bcast_ethaddr;
797 
798 	pkt = (uchar *)net_tx_packet;
799 
800 	eth_hdr_size = net_set_ether(pkt, ether, PROT_IP);
801 	pkt += eth_hdr_size;
802 	net_set_udp_header(pkt, dest, dport, sport, payload_len);
803 	pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
804 
805 	/* if MAC address was not discovered yet, do an ARP request */
806 	if (memcmp(ether, net_null_ethaddr, 6) == 0) {
807 		debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest);
808 
809 		/* save the ip and eth addr for the packet to send after arp */
810 		net_arp_wait_packet_ip = dest;
811 		arp_wait_packet_ethaddr = ether;
812 
813 		/* size of the waiting packet */
814 		arp_wait_tx_packet_size = pkt_hdr_size + payload_len;
815 
816 		/* and do the ARP request */
817 		arp_wait_try = 1;
818 		arp_wait_timer_start = get_timer(0);
819 		arp_request();
820 		return 1;	/* waiting */
821 	} else {
822 		debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
823 			   &dest, ether);
824 		net_send_packet(net_tx_packet, pkt_hdr_size + payload_len);
825 		return 0;	/* transmitted */
826 	}
827 }
828 
829 #ifdef CONFIG_IP_DEFRAG
830 /*
831  * This function collects fragments in a single packet, according
832  * to the algorithm in RFC815. It returns NULL or the pointer to
833  * a complete packet, in static storage
834  */
835 #ifndef CONFIG_NET_MAXDEFRAG
836 #define CONFIG_NET_MAXDEFRAG 16384
837 #endif
838 /*
839  * MAXDEFRAG, above, is chosen in the config file and  is real data
840  * so we need to add the NFS overhead, which is more than TFTP.
841  * To use sizeof in the internal unnamed structures, we need a real
842  * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately).
843  * The compiler doesn't complain nor allocates the actual structure
844  */
845 static struct rpc_t rpc_specimen;
846 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply))
847 
848 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE)
849 
850 /*
851  * this is the packet being assembled, either data or frag control.
852  * Fragments go by 8 bytes, so this union must be 8 bytes long
853  */
854 struct hole {
855 	/* first_byte is address of this structure */
856 	u16 last_byte;	/* last byte in this hole + 1 (begin of next hole) */
857 	u16 next_hole;	/* index of next (in 8-b blocks), 0 == none */
858 	u16 prev_hole;	/* index of prev, 0 == none */
859 	u16 unused;
860 };
861 
862 static struct ip_udp_hdr *__net_defragment(struct ip_udp_hdr *ip, int *lenp)
863 {
864 	static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
865 	static u16 first_hole, total_len;
866 	struct hole *payload, *thisfrag, *h, *newh;
867 	struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff;
868 	uchar *indata = (uchar *)ip;
869 	int offset8, start, len, done = 0;
870 	u16 ip_off = ntohs(ip->ip_off);
871 
872 	/* payload starts after IP header, this fragment is in there */
873 	payload = (struct hole *)(pkt_buff + IP_HDR_SIZE);
874 	offset8 =  (ip_off & IP_OFFS);
875 	thisfrag = payload + offset8;
876 	start = offset8 * 8;
877 	len = ntohs(ip->ip_len) - IP_HDR_SIZE;
878 
879 	if (start + len > IP_MAXUDP) /* fragment extends too far */
880 		return NULL;
881 
882 	if (!total_len || localip->ip_id != ip->ip_id) {
883 		/* new (or different) packet, reset structs */
884 		total_len = 0xffff;
885 		payload[0].last_byte = ~0;
886 		payload[0].next_hole = 0;
887 		payload[0].prev_hole = 0;
888 		first_hole = 0;
889 		/* any IP header will work, copy the first we received */
890 		memcpy(localip, ip, IP_HDR_SIZE);
891 	}
892 
893 	/*
894 	 * What follows is the reassembly algorithm. We use the payload
895 	 * array as a linked list of hole descriptors, as each hole starts
896 	 * at a multiple of 8 bytes. However, last byte can be whatever value,
897 	 * so it is represented as byte count, not as 8-byte blocks.
898 	 */
899 
900 	h = payload + first_hole;
901 	while (h->last_byte < start) {
902 		if (!h->next_hole) {
903 			/* no hole that far away */
904 			return NULL;
905 		}
906 		h = payload + h->next_hole;
907 	}
908 
909 	/* last fragment may be 1..7 bytes, the "+7" forces acceptance */
910 	if (offset8 + ((len + 7) / 8) <= h - payload) {
911 		/* no overlap with holes (dup fragment?) */
912 		return NULL;
913 	}
914 
915 	if (!(ip_off & IP_FLAGS_MFRAG)) {
916 		/* no more fragmentss: truncate this (last) hole */
917 		total_len = start + len;
918 		h->last_byte = start + len;
919 	}
920 
921 	/*
922 	 * There is some overlap: fix the hole list. This code doesn't
923 	 * deal with a fragment that overlaps with two different holes
924 	 * (thus being a superset of a previously-received fragment).
925 	 */
926 
927 	if ((h >= thisfrag) && (h->last_byte <= start + len)) {
928 		/* complete overlap with hole: remove hole */
929 		if (!h->prev_hole && !h->next_hole) {
930 			/* last remaining hole */
931 			done = 1;
932 		} else if (!h->prev_hole) {
933 			/* first hole */
934 			first_hole = h->next_hole;
935 			payload[h->next_hole].prev_hole = 0;
936 		} else if (!h->next_hole) {
937 			/* last hole */
938 			payload[h->prev_hole].next_hole = 0;
939 		} else {
940 			/* in the middle of the list */
941 			payload[h->next_hole].prev_hole = h->prev_hole;
942 			payload[h->prev_hole].next_hole = h->next_hole;
943 		}
944 
945 	} else if (h->last_byte <= start + len) {
946 		/* overlaps with final part of the hole: shorten this hole */
947 		h->last_byte = start;
948 
949 	} else if (h >= thisfrag) {
950 		/* overlaps with initial part of the hole: move this hole */
951 		newh = thisfrag + (len / 8);
952 		*newh = *h;
953 		h = newh;
954 		if (h->next_hole)
955 			payload[h->next_hole].prev_hole = (h - payload);
956 		if (h->prev_hole)
957 			payload[h->prev_hole].next_hole = (h - payload);
958 		else
959 			first_hole = (h - payload);
960 
961 	} else {
962 		/* fragment sits in the middle: split the hole */
963 		newh = thisfrag + (len / 8);
964 		*newh = *h;
965 		h->last_byte = start;
966 		h->next_hole = (newh - payload);
967 		newh->prev_hole = (h - payload);
968 		if (newh->next_hole)
969 			payload[newh->next_hole].prev_hole = (newh - payload);
970 	}
971 
972 	/* finally copy this fragment and possibly return whole packet */
973 	memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len);
974 	if (!done)
975 		return NULL;
976 
977 	localip->ip_len = htons(total_len);
978 	*lenp = total_len + IP_HDR_SIZE;
979 	return localip;
980 }
981 
982 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
983 	int *lenp)
984 {
985 	u16 ip_off = ntohs(ip->ip_off);
986 	if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
987 		return ip; /* not a fragment */
988 	return __net_defragment(ip, lenp);
989 }
990 
991 #else /* !CONFIG_IP_DEFRAG */
992 
993 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
994 	int *lenp)
995 {
996 	u16 ip_off = ntohs(ip->ip_off);
997 	if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
998 		return ip; /* not a fragment */
999 	return NULL;
1000 }
1001 #endif
1002 
1003 /**
1004  * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
1005  * drop others.
1006  *
1007  * @parma ip	IP packet containing the ICMP
1008  */
1009 static void receive_icmp(struct ip_udp_hdr *ip, int len,
1010 			struct in_addr src_ip, struct ethernet_hdr *et)
1011 {
1012 	struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
1013 
1014 	switch (icmph->type) {
1015 	case ICMP_REDIRECT:
1016 		if (icmph->code != ICMP_REDIR_HOST)
1017 			return;
1018 		printf(" ICMP Host Redirect to %pI4 ",
1019 		       &icmph->un.gateway);
1020 		break;
1021 	default:
1022 #if defined(CONFIG_CMD_PING)
1023 		ping_receive(et, ip, len);
1024 #endif
1025 #ifdef CONFIG_CMD_TFTPPUT
1026 		if (packet_icmp_handler)
1027 			packet_icmp_handler(icmph->type, icmph->code,
1028 					    ntohs(ip->udp_dst), src_ip,
1029 					    ntohs(ip->udp_src), icmph->un.data,
1030 					    ntohs(ip->udp_len));
1031 #endif
1032 		break;
1033 	}
1034 }
1035 
1036 void net_process_received_packet(uchar *in_packet, int len)
1037 {
1038 	struct ethernet_hdr *et;
1039 	struct ip_udp_hdr *ip;
1040 	struct in_addr dst_ip;
1041 	struct in_addr src_ip;
1042 	int eth_proto;
1043 #if defined(CONFIG_CMD_CDP)
1044 	int iscdp;
1045 #endif
1046 	ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1047 
1048 	debug_cond(DEBUG_NET_PKT, "packet received\n");
1049 
1050 	net_rx_packet = in_packet;
1051 	net_rx_packet_len = len;
1052 	et = (struct ethernet_hdr *)in_packet;
1053 
1054 	/* too small packet? */
1055 	if (len < ETHER_HDR_SIZE)
1056 		return;
1057 
1058 #ifdef CONFIG_API
1059 	if (push_packet) {
1060 		(*push_packet)(in_packet, len);
1061 		return;
1062 	}
1063 #endif
1064 
1065 #if defined(CONFIG_CMD_CDP)
1066 	/* keep track if packet is CDP */
1067 	iscdp = is_cdp_packet(et->et_dest);
1068 #endif
1069 
1070 	myvlanid = ntohs(net_our_vlan);
1071 	if (myvlanid == (ushort)-1)
1072 		myvlanid = VLAN_NONE;
1073 	mynvlanid = ntohs(net_native_vlan);
1074 	if (mynvlanid == (ushort)-1)
1075 		mynvlanid = VLAN_NONE;
1076 
1077 	eth_proto = ntohs(et->et_protlen);
1078 
1079 	if (eth_proto < 1514) {
1080 		struct e802_hdr *et802 = (struct e802_hdr *)et;
1081 		/*
1082 		 *	Got a 802.2 packet.  Check the other protocol field.
1083 		 *	XXX VLAN over 802.2+SNAP not implemented!
1084 		 */
1085 		eth_proto = ntohs(et802->et_prot);
1086 
1087 		ip = (struct ip_udp_hdr *)(in_packet + E802_HDR_SIZE);
1088 		len -= E802_HDR_SIZE;
1089 
1090 	} else if (eth_proto != PROT_VLAN) {	/* normal packet */
1091 		ip = (struct ip_udp_hdr *)(in_packet + ETHER_HDR_SIZE);
1092 		len -= ETHER_HDR_SIZE;
1093 
1094 	} else {			/* VLAN packet */
1095 		struct vlan_ethernet_hdr *vet =
1096 			(struct vlan_ethernet_hdr *)et;
1097 
1098 		debug_cond(DEBUG_NET_PKT, "VLAN packet received\n");
1099 
1100 		/* too small packet? */
1101 		if (len < VLAN_ETHER_HDR_SIZE)
1102 			return;
1103 
1104 		/* if no VLAN active */
1105 		if ((ntohs(net_our_vlan) & VLAN_IDMASK) == VLAN_NONE
1106 #if defined(CONFIG_CMD_CDP)
1107 				&& iscdp == 0
1108 #endif
1109 				)
1110 			return;
1111 
1112 		cti = ntohs(vet->vet_tag);
1113 		vlanid = cti & VLAN_IDMASK;
1114 		eth_proto = ntohs(vet->vet_type);
1115 
1116 		ip = (struct ip_udp_hdr *)(in_packet + VLAN_ETHER_HDR_SIZE);
1117 		len -= VLAN_ETHER_HDR_SIZE;
1118 	}
1119 
1120 	debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto);
1121 
1122 #if defined(CONFIG_CMD_CDP)
1123 	if (iscdp) {
1124 		cdp_receive((uchar *)ip, len);
1125 		return;
1126 	}
1127 #endif
1128 
1129 	if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1130 		if (vlanid == VLAN_NONE)
1131 			vlanid = (mynvlanid & VLAN_IDMASK);
1132 		/* not matched? */
1133 		if (vlanid != (myvlanid & VLAN_IDMASK))
1134 			return;
1135 	}
1136 
1137 	switch (eth_proto) {
1138 	case PROT_ARP:
1139 		arp_receive(et, ip, len);
1140 		break;
1141 
1142 #ifdef CONFIG_CMD_RARP
1143 	case PROT_RARP:
1144 		rarp_receive(ip, len);
1145 		break;
1146 #endif
1147 	case PROT_IP:
1148 		debug_cond(DEBUG_NET_PKT, "Got IP\n");
1149 		/* Before we start poking the header, make sure it is there */
1150 		if (len < IP_UDP_HDR_SIZE) {
1151 			debug("len bad %d < %lu\n", len,
1152 			      (ulong)IP_UDP_HDR_SIZE);
1153 			return;
1154 		}
1155 		/* Check the packet length */
1156 		if (len < ntohs(ip->ip_len)) {
1157 			debug("len bad %d < %d\n", len, ntohs(ip->ip_len));
1158 			return;
1159 		}
1160 		len = ntohs(ip->ip_len);
1161 		debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n",
1162 			   len, ip->ip_hl_v & 0xff);
1163 
1164 		/* Can't deal with anything except IPv4 */
1165 		if ((ip->ip_hl_v & 0xf0) != 0x40)
1166 			return;
1167 		/* Can't deal with IP options (headers != 20 bytes) */
1168 		if ((ip->ip_hl_v & 0x0f) > 0x05)
1169 			return;
1170 		/* Check the Checksum of the header */
1171 		if (!ip_checksum_ok((uchar *)ip, IP_HDR_SIZE)) {
1172 			debug("checksum bad\n");
1173 			return;
1174 		}
1175 		/* If it is not for us, ignore it */
1176 		dst_ip = net_read_ip(&ip->ip_dst);
1177 		if (net_ip.s_addr && dst_ip.s_addr != net_ip.s_addr &&
1178 		    dst_ip.s_addr != 0xFFFFFFFF) {
1179 #ifdef CONFIG_MCAST_TFTP
1180 			if (net_mcast_addr != dst_ip)
1181 #endif
1182 				return;
1183 		}
1184 		/* Read source IP address for later use */
1185 		src_ip = net_read_ip(&ip->ip_src);
1186 		/*
1187 		 * The function returns the unchanged packet if it's not
1188 		 * a fragment, and either the complete packet or NULL if
1189 		 * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1190 		 */
1191 		ip = net_defragment(ip, &len);
1192 		if (!ip)
1193 			return;
1194 		/*
1195 		 * watch for ICMP host redirects
1196 		 *
1197 		 * There is no real handler code (yet). We just watch
1198 		 * for ICMP host redirect messages. In case anybody
1199 		 * sees these messages: please contact me
1200 		 * (wd@denx.de), or - even better - send me the
1201 		 * necessary fixes :-)
1202 		 *
1203 		 * Note: in all cases where I have seen this so far
1204 		 * it was a problem with the router configuration,
1205 		 * for instance when a router was configured in the
1206 		 * BOOTP reply, but the TFTP server was on the same
1207 		 * subnet. So this is probably a warning that your
1208 		 * configuration might be wrong. But I'm not really
1209 		 * sure if there aren't any other situations.
1210 		 *
1211 		 * Simon Glass <sjg@chromium.org>: We get an ICMP when
1212 		 * we send a tftp packet to a dead connection, or when
1213 		 * there is no server at the other end.
1214 		 */
1215 		if (ip->ip_p == IPPROTO_ICMP) {
1216 			receive_icmp(ip, len, src_ip, et);
1217 			return;
1218 		} else if (ip->ip_p != IPPROTO_UDP) {	/* Only UDP packets */
1219 			return;
1220 		}
1221 
1222 		debug_cond(DEBUG_DEV_PKT,
1223 			   "received UDP (to=%pI4, from=%pI4, len=%d)\n",
1224 			   &dst_ip, &src_ip, len);
1225 
1226 #ifdef CONFIG_UDP_CHECKSUM
1227 		if (ip->udp_xsum != 0) {
1228 			ulong   xsum;
1229 			ushort *sumptr;
1230 			ushort  sumlen;
1231 
1232 			xsum  = ip->ip_p;
1233 			xsum += (ntohs(ip->udp_len));
1234 			xsum += (ntohl(ip->ip_src.s_addr) >> 16) & 0x0000ffff;
1235 			xsum += (ntohl(ip->ip_src.s_addr) >>  0) & 0x0000ffff;
1236 			xsum += (ntohl(ip->ip_dst.s_addr) >> 16) & 0x0000ffff;
1237 			xsum += (ntohl(ip->ip_dst.s_addr) >>  0) & 0x0000ffff;
1238 
1239 			sumlen = ntohs(ip->udp_len);
1240 			sumptr = (ushort *)&(ip->udp_src);
1241 
1242 			while (sumlen > 1) {
1243 				ushort sumdata;
1244 
1245 				sumdata = *sumptr++;
1246 				xsum += ntohs(sumdata);
1247 				sumlen -= 2;
1248 			}
1249 			if (sumlen > 0) {
1250 				ushort sumdata;
1251 
1252 				sumdata = *(unsigned char *)sumptr;
1253 				sumdata = (sumdata << 8) & 0xff00;
1254 				xsum += sumdata;
1255 			}
1256 			while ((xsum >> 16) != 0) {
1257 				xsum = (xsum & 0x0000ffff) +
1258 				       ((xsum >> 16) & 0x0000ffff);
1259 			}
1260 			if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1261 				printf(" UDP wrong checksum %08lx %08x\n",
1262 				       xsum, ntohs(ip->udp_xsum));
1263 				return;
1264 			}
1265 		}
1266 #endif
1267 
1268 #if defined(CONFIG_NETCONSOLE) && !(CONFIG_SPL_BUILD)
1269 		nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
1270 				src_ip,
1271 				ntohs(ip->udp_dst),
1272 				ntohs(ip->udp_src),
1273 				ntohs(ip->udp_len) - UDP_HDR_SIZE);
1274 #endif
1275 		/*
1276 		 * IP header OK.  Pass the packet to the current handler.
1277 		 */
1278 		(*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE,
1279 				      ntohs(ip->udp_dst),
1280 				      src_ip,
1281 				      ntohs(ip->udp_src),
1282 				      ntohs(ip->udp_len) - UDP_HDR_SIZE);
1283 		break;
1284 	}
1285 }
1286 
1287 /**********************************************************************/
1288 
1289 static int net_check_prereq(enum proto_t protocol)
1290 {
1291 	switch (protocol) {
1292 		/* Fall through */
1293 #if defined(CONFIG_CMD_PING)
1294 	case PING:
1295 		if (net_ping_ip.s_addr == 0) {
1296 			puts("*** ERROR: ping address not given\n");
1297 			return 1;
1298 		}
1299 		goto common;
1300 #endif
1301 #if defined(CONFIG_CMD_SNTP)
1302 	case SNTP:
1303 		if (net_ntp_server.s_addr == 0) {
1304 			puts("*** ERROR: NTP server address not given\n");
1305 			return 1;
1306 		}
1307 		goto common;
1308 #endif
1309 #if defined(CONFIG_CMD_DNS)
1310 	case DNS:
1311 		if (net_dns_server.s_addr == 0) {
1312 			puts("*** ERROR: DNS server address not given\n");
1313 			return 1;
1314 		}
1315 		goto common;
1316 #endif
1317 #if defined(CONFIG_CMD_NFS)
1318 	case NFS:
1319 #endif
1320 		/* Fall through */
1321 	case TFTPGET:
1322 	case TFTPPUT:
1323 		if (net_server_ip.s_addr == 0) {
1324 			puts("*** ERROR: `serverip' not set\n");
1325 			return 1;
1326 		}
1327 #if	defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
1328 	defined(CONFIG_CMD_DNS)
1329 common:
1330 #endif
1331 		/* Fall through */
1332 
1333 	case NETCONS:
1334 	case TFTPSRV:
1335 		if (net_ip.s_addr == 0) {
1336 			puts("*** ERROR: `ipaddr' not set\n");
1337 			return 1;
1338 		}
1339 		/* Fall through */
1340 
1341 #ifdef CONFIG_CMD_RARP
1342 	case RARP:
1343 #endif
1344 	case BOOTP:
1345 	case CDP:
1346 	case DHCP:
1347 	case LINKLOCAL:
1348 		if (memcmp(net_ethaddr, "\0\0\0\0\0\0", 6) == 0) {
1349 			int num = eth_get_dev_index();
1350 
1351 			switch (num) {
1352 			case -1:
1353 				puts("*** ERROR: No ethernet found.\n");
1354 				return 1;
1355 			case 0:
1356 				puts("*** ERROR: `ethaddr' not set\n");
1357 				break;
1358 			default:
1359 				printf("*** ERROR: `eth%daddr' not set\n",
1360 				       num);
1361 				break;
1362 			}
1363 
1364 			net_start_again();
1365 			return 2;
1366 		}
1367 		/* Fall through */
1368 	default:
1369 		return 0;
1370 	}
1371 	return 0;		/* OK */
1372 }
1373 /**********************************************************************/
1374 
1375 int
1376 net_eth_hdr_size(void)
1377 {
1378 	ushort myvlanid;
1379 
1380 	myvlanid = ntohs(net_our_vlan);
1381 	if (myvlanid == (ushort)-1)
1382 		myvlanid = VLAN_NONE;
1383 
1384 	return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1385 		VLAN_ETHER_HDR_SIZE;
1386 }
1387 
1388 int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot)
1389 {
1390 	struct ethernet_hdr *et = (struct ethernet_hdr *)xet;
1391 	ushort myvlanid;
1392 
1393 	myvlanid = ntohs(net_our_vlan);
1394 	if (myvlanid == (ushort)-1)
1395 		myvlanid = VLAN_NONE;
1396 
1397 	memcpy(et->et_dest, dest_ethaddr, 6);
1398 	memcpy(et->et_src, net_ethaddr, 6);
1399 	if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1400 		et->et_protlen = htons(prot);
1401 		return ETHER_HDR_SIZE;
1402 	} else {
1403 		struct vlan_ethernet_hdr *vet =
1404 			(struct vlan_ethernet_hdr *)xet;
1405 
1406 		vet->vet_vlan_type = htons(PROT_VLAN);
1407 		vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1408 		vet->vet_type = htons(prot);
1409 		return VLAN_ETHER_HDR_SIZE;
1410 	}
1411 }
1412 
1413 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
1414 {
1415 	ushort protlen;
1416 
1417 	memcpy(et->et_dest, addr, 6);
1418 	memcpy(et->et_src, net_ethaddr, 6);
1419 	protlen = ntohs(et->et_protlen);
1420 	if (protlen == PROT_VLAN) {
1421 		struct vlan_ethernet_hdr *vet =
1422 			(struct vlan_ethernet_hdr *)et;
1423 		vet->vet_type = htons(prot);
1424 		return VLAN_ETHER_HDR_SIZE;
1425 	} else if (protlen > 1514) {
1426 		et->et_protlen = htons(prot);
1427 		return ETHER_HDR_SIZE;
1428 	} else {
1429 		/* 802.2 + SNAP */
1430 		struct e802_hdr *et802 = (struct e802_hdr *)et;
1431 		et802->et_prot = htons(prot);
1432 		return E802_HDR_SIZE;
1433 	}
1434 }
1435 
1436 void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source)
1437 {
1438 	struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1439 
1440 	/*
1441 	 *	Construct an IP header.
1442 	 */
1443 	/* IP_HDR_SIZE / 4 (not including UDP) */
1444 	ip->ip_hl_v  = 0x45;
1445 	ip->ip_tos   = 0;
1446 	ip->ip_len   = htons(IP_HDR_SIZE);
1447 	ip->ip_id    = htons(net_ip_id++);
1448 	ip->ip_off   = htons(IP_FLAGS_DFRAG);	/* Don't fragment */
1449 	ip->ip_ttl   = 255;
1450 	ip->ip_sum   = 0;
1451 	/* already in network byte order */
1452 	net_copy_ip((void *)&ip->ip_src, &source);
1453 	/* already in network byte order */
1454 	net_copy_ip((void *)&ip->ip_dst, &dest);
1455 }
1456 
1457 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport,
1458 			int len)
1459 {
1460 	struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1461 
1462 	/*
1463 	 *	If the data is an odd number of bytes, zero the
1464 	 *	byte after the last byte so that the checksum
1465 	 *	will work.
1466 	 */
1467 	if (len & 1)
1468 		pkt[IP_UDP_HDR_SIZE + len] = 0;
1469 
1470 	net_set_ip_header(pkt, dest, net_ip);
1471 	ip->ip_len   = htons(IP_UDP_HDR_SIZE + len);
1472 	ip->ip_p     = IPPROTO_UDP;
1473 	ip->ip_sum   = compute_ip_checksum(ip, IP_HDR_SIZE);
1474 
1475 	ip->udp_src  = htons(sport);
1476 	ip->udp_dst  = htons(dport);
1477 	ip->udp_len  = htons(UDP_HDR_SIZE + len);
1478 	ip->udp_xsum = 0;
1479 }
1480 
1481 void copy_filename(char *dst, const char *src, int size)
1482 {
1483 	if (*src && (*src == '"')) {
1484 		++src;
1485 		--size;
1486 	}
1487 
1488 	while ((--size > 0) && *src && (*src != '"'))
1489 		*dst++ = *src++;
1490 	*dst = '\0';
1491 }
1492 
1493 #if	defined(CONFIG_CMD_NFS)		|| \
1494 	defined(CONFIG_CMD_SNTP)	|| \
1495 	defined(CONFIG_CMD_DNS)
1496 /*
1497  * make port a little random (1024-17407)
1498  * This keeps the math somewhat trivial to compute, and seems to work with
1499  * all supported protocols/clients/servers
1500  */
1501 unsigned int random_port(void)
1502 {
1503 	return 1024 + (get_timer(0) % 0x4000);
1504 }
1505 #endif
1506 
1507 void ip_to_string(struct in_addr x, char *s)
1508 {
1509 	x.s_addr = ntohl(x.s_addr);
1510 	sprintf(s, "%d.%d.%d.%d",
1511 		(int) ((x.s_addr >> 24) & 0xff),
1512 		(int) ((x.s_addr >> 16) & 0xff),
1513 		(int) ((x.s_addr >> 8) & 0xff),
1514 		(int) ((x.s_addr >> 0) & 0xff)
1515 	);
1516 }
1517 
1518 void vlan_to_string(ushort x, char *s)
1519 {
1520 	x = ntohs(x);
1521 
1522 	if (x == (ushort)-1)
1523 		x = VLAN_NONE;
1524 
1525 	if (x == VLAN_NONE)
1526 		strcpy(s, "none");
1527 	else
1528 		sprintf(s, "%d", x & VLAN_IDMASK);
1529 }
1530 
1531 ushort string_to_vlan(const char *s)
1532 {
1533 	ushort id;
1534 
1535 	if (s == NULL)
1536 		return htons(VLAN_NONE);
1537 
1538 	if (*s < '0' || *s > '9')
1539 		id = VLAN_NONE;
1540 	else
1541 		id = (ushort)simple_strtoul(s, NULL, 10);
1542 
1543 	return htons(id);
1544 }
1545 
1546 ushort getenv_vlan(char *var)
1547 {
1548 	return string_to_vlan(getenv(var));
1549 }
1550