xref: /openbmc/u-boot/net/tftp.c (revision 1a68faac)
1 /*
2  * Copyright 1994, 1995, 2000 Neil Russell.
3  * (See License)
4  * Copyright 2000, 2001 DENX Software Engineering, Wolfgang Denk, wd@denx.de
5  * Copyright 2011 Comelit Group SpA,
6  *                Luca Ceresoli <luca.ceresoli@comelit.it>
7  */
8 
9 #include <common.h>
10 #include <command.h>
11 #include <efi_loader.h>
12 #include <mapmem.h>
13 #include <net.h>
14 #include <net/tftp.h>
15 #include "bootp.h"
16 #ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
17 #include <flash.h>
18 #endif
19 
20 DECLARE_GLOBAL_DATA_PTR;
21 
22 /* Well known TFTP port # */
23 #define WELL_KNOWN_PORT	69
24 /* Millisecs to timeout for lost pkt */
25 #define TIMEOUT		5000UL
26 #ifndef	CONFIG_NET_RETRY_COUNT
27 /* # of timeouts before giving up */
28 # define TIMEOUT_COUNT	10
29 #else
30 # define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT * 2)
31 #endif
32 /* Number of "loading" hashes per line (for checking the image size) */
33 #define HASHES_PER_LINE	65
34 
35 /*
36  *	TFTP operations.
37  */
38 #define TFTP_RRQ	1
39 #define TFTP_WRQ	2
40 #define TFTP_DATA	3
41 #define TFTP_ACK	4
42 #define TFTP_ERROR	5
43 #define TFTP_OACK	6
44 
45 static ulong timeout_ms = TIMEOUT;
46 static int timeout_count_max = TIMEOUT_COUNT;
47 static ulong time_start;   /* Record time we started tftp */
48 
49 /*
50  * These globals govern the timeout behavior when attempting a connection to a
51  * TFTP server. tftp_timeout_ms specifies the number of milliseconds to
52  * wait for the server to respond to initial connection. Second global,
53  * tftp_timeout_count_max, gives the number of such connection retries.
54  * tftp_timeout_count_max must be non-negative and tftp_timeout_ms must be
55  * positive. The globals are meant to be set (and restored) by code needing
56  * non-standard timeout behavior when initiating a TFTP transfer.
57  */
58 ulong tftp_timeout_ms = TIMEOUT;
59 int tftp_timeout_count_max = TIMEOUT_COUNT;
60 
61 enum {
62 	TFTP_ERR_UNDEFINED           = 0,
63 	TFTP_ERR_FILE_NOT_FOUND      = 1,
64 	TFTP_ERR_ACCESS_DENIED       = 2,
65 	TFTP_ERR_DISK_FULL           = 3,
66 	TFTP_ERR_UNEXPECTED_OPCODE   = 4,
67 	TFTP_ERR_UNKNOWN_TRANSFER_ID  = 5,
68 	TFTP_ERR_FILE_ALREADY_EXISTS = 6,
69 };
70 
71 static struct in_addr tftp_remote_ip;
72 /* The UDP port at their end */
73 static int	tftp_remote_port;
74 /* The UDP port at our end */
75 static int	tftp_our_port;
76 static int	timeout_count;
77 /* packet sequence number */
78 static ulong	tftp_cur_block;
79 /* last packet sequence number received */
80 static ulong	tftp_prev_block;
81 /* count of sequence number wraparounds */
82 static ulong	tftp_block_wrap;
83 /* memory offset due to wrapping */
84 static ulong	tftp_block_wrap_offset;
85 static int	tftp_state;
86 static ulong	tftp_load_addr;
87 #ifdef CONFIG_LMB
88 static ulong	tftp_load_size;
89 #endif
90 #ifdef CONFIG_TFTP_TSIZE
91 /* The file size reported by the server */
92 static int	tftp_tsize;
93 /* The number of hashes we printed */
94 static short	tftp_tsize_num_hash;
95 #endif
96 #ifdef CONFIG_CMD_TFTPPUT
97 /* 1 if writing, else 0 */
98 static int	tftp_put_active;
99 /* 1 if we have sent the last block */
100 static int	tftp_put_final_block_sent;
101 #else
102 #define tftp_put_active	0
103 #endif
104 
105 #define STATE_SEND_RRQ	1
106 #define STATE_DATA	2
107 #define STATE_TOO_LARGE	3
108 #define STATE_BAD_MAGIC	4
109 #define STATE_OACK	5
110 #define STATE_RECV_WRQ	6
111 #define STATE_SEND_WRQ	7
112 
113 /* default TFTP block size */
114 #define TFTP_BLOCK_SIZE		512
115 /* sequence number is 16 bit */
116 #define TFTP_SEQUENCE_SIZE	((ulong)(1<<16))
117 
118 #define DEFAULT_NAME_LEN	(8 + 4 + 1)
119 static char default_filename[DEFAULT_NAME_LEN];
120 
121 #ifndef CONFIG_TFTP_FILE_NAME_MAX_LEN
122 #define MAX_LEN 128
123 #else
124 #define MAX_LEN CONFIG_TFTP_FILE_NAME_MAX_LEN
125 #endif
126 
127 static char tftp_filename[MAX_LEN];
128 
129 /* 512 is poor choice for ethernet, MTU is typically 1500.
130  * Minus eth.hdrs thats 1468.  Can get 2x better throughput with
131  * almost-MTU block sizes.  At least try... fall back to 512 if need be.
132  * (but those using CONFIG_IP_DEFRAG may want to set a larger block in cfg file)
133  */
134 #ifdef CONFIG_TFTP_BLOCKSIZE
135 #define TFTP_MTU_BLOCKSIZE CONFIG_TFTP_BLOCKSIZE
136 #else
137 #define TFTP_MTU_BLOCKSIZE 1468
138 #endif
139 
140 static unsigned short tftp_block_size = TFTP_BLOCK_SIZE;
141 static unsigned short tftp_block_size_option = TFTP_MTU_BLOCKSIZE;
142 
143 static inline int store_block(int block, uchar *src, unsigned int len)
144 {
145 	ulong offset = block * tftp_block_size + tftp_block_wrap_offset;
146 	ulong newsize = offset + len;
147 	ulong store_addr = tftp_load_addr + offset;
148 #ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
149 	int i, rc = 0;
150 
151 	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
152 		/* start address in flash? */
153 		if (flash_info[i].flash_id == FLASH_UNKNOWN)
154 			continue;
155 		if (store_addr >= flash_info[i].start[0]) {
156 			rc = 1;
157 			break;
158 		}
159 	}
160 
161 	if (rc) { /* Flash is destination for this packet */
162 		rc = flash_write((char *)src, store_addr, len);
163 		if (rc) {
164 			flash_perror(rc);
165 			return rc;
166 		}
167 	} else
168 #endif /* CONFIG_SYS_DIRECT_FLASH_TFTP */
169 	{
170 		void *ptr;
171 
172 #ifdef CONFIG_LMB
173 		if (store_addr < tftp_load_addr ||
174 		    store_addr + len > tftp_load_addr + tftp_load_size) {
175 			puts("\nTFTP error: ");
176 			puts("trying to overwrite reserved memory...\n");
177 			return -1;
178 		}
179 #endif
180 		ptr = map_sysmem(store_addr, len);
181 		memcpy(ptr, src, len);
182 		unmap_sysmem(ptr);
183 	}
184 
185 	if (net_boot_file_size < newsize)
186 		net_boot_file_size = newsize;
187 
188 	return 0;
189 }
190 
191 /* Clear our state ready for a new transfer */
192 static void new_transfer(void)
193 {
194 	tftp_prev_block = 0;
195 	tftp_block_wrap = 0;
196 	tftp_block_wrap_offset = 0;
197 #ifdef CONFIG_CMD_TFTPPUT
198 	tftp_put_final_block_sent = 0;
199 #endif
200 }
201 
202 #ifdef CONFIG_CMD_TFTPPUT
203 /**
204  * Load the next block from memory to be sent over tftp.
205  *
206  * @param block	Block number to send
207  * @param dst	Destination buffer for data
208  * @param len	Number of bytes in block (this one and every other)
209  * @return number of bytes loaded
210  */
211 static int load_block(unsigned block, uchar *dst, unsigned len)
212 {
213 	/* We may want to get the final block from the previous set */
214 	ulong offset = ((int)block - 1) * len + tftp_block_wrap_offset;
215 	ulong tosend = len;
216 
217 	tosend = min(net_boot_file_size - offset, tosend);
218 	(void)memcpy(dst, (void *)(save_addr + offset), tosend);
219 	debug("%s: block=%d, offset=%ld, len=%d, tosend=%ld\n", __func__,
220 	      block, offset, len, tosend);
221 	return tosend;
222 }
223 #endif
224 
225 static void tftp_send(void);
226 static void tftp_timeout_handler(void);
227 
228 /**********************************************************************/
229 
230 static void show_block_marker(void)
231 {
232 #ifdef CONFIG_TFTP_TSIZE
233 	if (tftp_tsize) {
234 		ulong pos = tftp_cur_block * tftp_block_size +
235 			tftp_block_wrap_offset;
236 		if (pos > tftp_tsize)
237 			pos = tftp_tsize;
238 
239 		while (tftp_tsize_num_hash < pos * 50 / tftp_tsize) {
240 			putc('#');
241 			tftp_tsize_num_hash++;
242 		}
243 	} else
244 #endif
245 	{
246 		if (((tftp_cur_block - 1) % 10) == 0)
247 			putc('#');
248 		else if ((tftp_cur_block % (10 * HASHES_PER_LINE)) == 0)
249 			puts("\n\t ");
250 	}
251 }
252 
253 /**
254  * restart the current transfer due to an error
255  *
256  * @param msg	Message to print for user
257  */
258 static void restart(const char *msg)
259 {
260 	printf("\n%s; starting again\n", msg);
261 	net_start_again();
262 }
263 
264 /*
265  * Check if the block number has wrapped, and update progress
266  *
267  * TODO: The egregious use of global variables in this file should be tidied.
268  */
269 static void update_block_number(void)
270 {
271 	/*
272 	 * RFC1350 specifies that the first data packet will
273 	 * have sequence number 1. If we receive a sequence
274 	 * number of 0 this means that there was a wrap
275 	 * around of the (16 bit) counter.
276 	 */
277 	if (tftp_cur_block == 0 && tftp_prev_block != 0) {
278 		tftp_block_wrap++;
279 		tftp_block_wrap_offset += tftp_block_size * TFTP_SEQUENCE_SIZE;
280 		timeout_count = 0; /* we've done well, reset the timeout */
281 	} else {
282 		show_block_marker();
283 	}
284 }
285 
286 /* The TFTP get or put is complete */
287 static void tftp_complete(void)
288 {
289 #ifdef CONFIG_TFTP_TSIZE
290 	/* Print hash marks for the last packet received */
291 	while (tftp_tsize && tftp_tsize_num_hash < 49) {
292 		putc('#');
293 		tftp_tsize_num_hash++;
294 	}
295 	puts("  ");
296 	print_size(tftp_tsize, "");
297 #endif
298 	time_start = get_timer(time_start);
299 	if (time_start > 0) {
300 		puts("\n\t ");	/* Line up with "Loading: " */
301 		print_size(net_boot_file_size /
302 			time_start * 1000, "/s");
303 	}
304 	puts("\ndone\n");
305 	net_set_state(NETLOOP_SUCCESS);
306 }
307 
308 static void tftp_send(void)
309 {
310 	uchar *pkt;
311 	uchar *xp;
312 	int len = 0;
313 	ushort *s;
314 
315 	/*
316 	 *	We will always be sending some sort of packet, so
317 	 *	cobble together the packet headers now.
318 	 */
319 	pkt = net_tx_packet + net_eth_hdr_size() + IP_UDP_HDR_SIZE;
320 
321 	switch (tftp_state) {
322 	case STATE_SEND_RRQ:
323 	case STATE_SEND_WRQ:
324 		xp = pkt;
325 		s = (ushort *)pkt;
326 #ifdef CONFIG_CMD_TFTPPUT
327 		*s++ = htons(tftp_state == STATE_SEND_RRQ ? TFTP_RRQ :
328 			TFTP_WRQ);
329 #else
330 		*s++ = htons(TFTP_RRQ);
331 #endif
332 		pkt = (uchar *)s;
333 		strcpy((char *)pkt, tftp_filename);
334 		pkt += strlen(tftp_filename) + 1;
335 		strcpy((char *)pkt, "octet");
336 		pkt += 5 /*strlen("octet")*/ + 1;
337 		strcpy((char *)pkt, "timeout");
338 		pkt += 7 /*strlen("timeout")*/ + 1;
339 		sprintf((char *)pkt, "%lu", timeout_ms / 1000);
340 		debug("send option \"timeout %s\"\n", (char *)pkt);
341 		pkt += strlen((char *)pkt) + 1;
342 #ifdef CONFIG_TFTP_TSIZE
343 		pkt += sprintf((char *)pkt, "tsize%c%u%c",
344 				0, net_boot_file_size, 0);
345 #endif
346 		/* try for more effic. blk size */
347 		pkt += sprintf((char *)pkt, "blksize%c%d%c",
348 				0, tftp_block_size_option, 0);
349 		len = pkt - xp;
350 		break;
351 
352 	case STATE_OACK:
353 
354 	case STATE_RECV_WRQ:
355 	case STATE_DATA:
356 		xp = pkt;
357 		s = (ushort *)pkt;
358 		s[0] = htons(TFTP_ACK);
359 		s[1] = htons(tftp_cur_block);
360 		pkt = (uchar *)(s + 2);
361 #ifdef CONFIG_CMD_TFTPPUT
362 		if (tftp_put_active) {
363 			int toload = tftp_block_size;
364 			int loaded = load_block(tftp_cur_block, pkt, toload);
365 
366 			s[0] = htons(TFTP_DATA);
367 			pkt += loaded;
368 			tftp_put_final_block_sent = (loaded < toload);
369 		}
370 #endif
371 		len = pkt - xp;
372 		break;
373 
374 	case STATE_TOO_LARGE:
375 		xp = pkt;
376 		s = (ushort *)pkt;
377 		*s++ = htons(TFTP_ERROR);
378 			*s++ = htons(3);
379 
380 		pkt = (uchar *)s;
381 		strcpy((char *)pkt, "File too large");
382 		pkt += 14 /*strlen("File too large")*/ + 1;
383 		len = pkt - xp;
384 		break;
385 
386 	case STATE_BAD_MAGIC:
387 		xp = pkt;
388 		s = (ushort *)pkt;
389 		*s++ = htons(TFTP_ERROR);
390 		*s++ = htons(2);
391 		pkt = (uchar *)s;
392 		strcpy((char *)pkt, "File has bad magic");
393 		pkt += 18 /*strlen("File has bad magic")*/ + 1;
394 		len = pkt - xp;
395 		break;
396 	}
397 
398 	net_send_udp_packet(net_server_ethaddr, tftp_remote_ip,
399 			    tftp_remote_port, tftp_our_port, len);
400 }
401 
402 #ifdef CONFIG_CMD_TFTPPUT
403 static void icmp_handler(unsigned type, unsigned code, unsigned dest,
404 			 struct in_addr sip, unsigned src, uchar *pkt,
405 			 unsigned len)
406 {
407 	if (type == ICMP_NOT_REACH && code == ICMP_NOT_REACH_PORT) {
408 		/* Oh dear the other end has gone away */
409 		restart("TFTP server died");
410 	}
411 }
412 #endif
413 
414 static void tftp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
415 			 unsigned src, unsigned len)
416 {
417 	__be16 proto;
418 	__be16 *s;
419 	int i;
420 
421 	if (dest != tftp_our_port) {
422 			return;
423 	}
424 	if (tftp_state != STATE_SEND_RRQ && src != tftp_remote_port &&
425 	    tftp_state != STATE_RECV_WRQ && tftp_state != STATE_SEND_WRQ)
426 		return;
427 
428 	if (len < 2)
429 		return;
430 	len -= 2;
431 	/* warning: don't use increment (++) in ntohs() macros!! */
432 	s = (__be16 *)pkt;
433 	proto = *s++;
434 	pkt = (uchar *)s;
435 	switch (ntohs(proto)) {
436 	case TFTP_RRQ:
437 		break;
438 
439 	case TFTP_ACK:
440 #ifdef CONFIG_CMD_TFTPPUT
441 		if (tftp_put_active) {
442 			if (tftp_put_final_block_sent) {
443 				tftp_complete();
444 			} else {
445 				/*
446 				 * Move to the next block. We want our block
447 				 * count to wrap just like the other end!
448 				 */
449 				int block = ntohs(*s);
450 				int ack_ok = (tftp_cur_block == block);
451 
452 				tftp_cur_block = (unsigned short)(block + 1);
453 				update_block_number();
454 				if (ack_ok)
455 					tftp_send(); /* Send next data block */
456 			}
457 		}
458 #endif
459 		break;
460 
461 	default:
462 		break;
463 
464 #ifdef CONFIG_CMD_TFTPSRV
465 	case TFTP_WRQ:
466 		debug("Got WRQ\n");
467 		tftp_remote_ip = sip;
468 		tftp_remote_port = src;
469 		tftp_our_port = 1024 + (get_timer(0) % 3072);
470 		new_transfer();
471 		tftp_send(); /* Send ACK(0) */
472 		break;
473 #endif
474 
475 	case TFTP_OACK:
476 		debug("Got OACK: %s %s\n",
477 		      pkt, pkt + strlen((char *)pkt) + 1);
478 		tftp_state = STATE_OACK;
479 		tftp_remote_port = src;
480 		/*
481 		 * Check for 'blksize' option.
482 		 * Careful: "i" is signed, "len" is unsigned, thus
483 		 * something like "len-8" may give a *huge* number
484 		 */
485 		for (i = 0; i+8 < len; i++) {
486 			if (strcmp((char *)pkt + i, "blksize") == 0) {
487 				tftp_block_size = (unsigned short)
488 					simple_strtoul((char *)pkt + i + 8,
489 						       NULL, 10);
490 				debug("Blocksize ack: %s, %d\n",
491 				      (char *)pkt + i + 8, tftp_block_size);
492 			}
493 #ifdef CONFIG_TFTP_TSIZE
494 			if (strcmp((char *)pkt+i, "tsize") == 0) {
495 				tftp_tsize = simple_strtoul((char *)pkt + i + 6,
496 							   NULL, 10);
497 				debug("size = %s, %d\n",
498 				      (char *)pkt + i + 6, tftp_tsize);
499 			}
500 #endif
501 		}
502 #ifdef CONFIG_CMD_TFTPPUT
503 		if (tftp_put_active) {
504 			/* Get ready to send the first block */
505 			tftp_state = STATE_DATA;
506 			tftp_cur_block++;
507 		}
508 #endif
509 		tftp_send(); /* Send ACK or first data block */
510 		break;
511 	case TFTP_DATA:
512 		if (len < 2)
513 			return;
514 		len -= 2;
515 		tftp_cur_block = ntohs(*(__be16 *)pkt);
516 
517 		update_block_number();
518 
519 		if (tftp_state == STATE_SEND_RRQ)
520 			debug("Server did not acknowledge timeout option!\n");
521 
522 		if (tftp_state == STATE_SEND_RRQ || tftp_state == STATE_OACK ||
523 		    tftp_state == STATE_RECV_WRQ) {
524 			/* first block received */
525 			tftp_state = STATE_DATA;
526 			tftp_remote_port = src;
527 			new_transfer();
528 
529 			if (tftp_cur_block != 1) {	/* Assertion */
530 				puts("\nTFTP error: ");
531 				printf("First block is not block 1 (%ld)\n",
532 				       tftp_cur_block);
533 				puts("Starting again\n\n");
534 				net_start_again();
535 				break;
536 			}
537 		}
538 
539 		if (tftp_cur_block == tftp_prev_block) {
540 			/* Same block again; ignore it. */
541 			break;
542 		}
543 
544 		tftp_prev_block = tftp_cur_block;
545 		timeout_count_max = tftp_timeout_count_max;
546 		net_set_timeout_handler(timeout_ms, tftp_timeout_handler);
547 
548 		if (store_block(tftp_cur_block - 1, pkt + 2, len)) {
549 			eth_halt();
550 			net_set_state(NETLOOP_FAIL);
551 			break;
552 		}
553 
554 		/*
555 		 *	Acknowledge the block just received, which will prompt
556 		 *	the remote for the next one.
557 		 */
558 		tftp_send();
559 
560 		if (len < tftp_block_size)
561 			tftp_complete();
562 		break;
563 
564 	case TFTP_ERROR:
565 		printf("\nTFTP error: '%s' (%d)\n",
566 		       pkt + 2, ntohs(*(__be16 *)pkt));
567 
568 		switch (ntohs(*(__be16 *)pkt)) {
569 		case TFTP_ERR_FILE_NOT_FOUND:
570 		case TFTP_ERR_ACCESS_DENIED:
571 			puts("Not retrying...\n");
572 			eth_halt();
573 			net_set_state(NETLOOP_FAIL);
574 			break;
575 		case TFTP_ERR_UNDEFINED:
576 		case TFTP_ERR_DISK_FULL:
577 		case TFTP_ERR_UNEXPECTED_OPCODE:
578 		case TFTP_ERR_UNKNOWN_TRANSFER_ID:
579 		case TFTP_ERR_FILE_ALREADY_EXISTS:
580 		default:
581 			puts("Starting again\n\n");
582 			net_start_again();
583 			break;
584 		}
585 		break;
586 	}
587 }
588 
589 
590 static void tftp_timeout_handler(void)
591 {
592 	if (++timeout_count > timeout_count_max) {
593 		restart("Retry count exceeded");
594 	} else {
595 		puts("T ");
596 		net_set_timeout_handler(timeout_ms, tftp_timeout_handler);
597 		if (tftp_state != STATE_RECV_WRQ)
598 			tftp_send();
599 	}
600 }
601 
602 /* Initialize tftp_load_addr and tftp_load_size from load_addr and lmb */
603 static int tftp_init_load_addr(void)
604 {
605 #ifdef CONFIG_LMB
606 	struct lmb lmb;
607 	phys_size_t max_size;
608 
609 	lmb_init_and_reserve(&lmb, gd->bd, (void *)gd->fdt_blob);
610 
611 	max_size = lmb_get_free_size(&lmb, load_addr);
612 	if (!max_size)
613 		return -1;
614 
615 	tftp_load_size = max_size;
616 #endif
617 	tftp_load_addr = load_addr;
618 	return 0;
619 }
620 
621 void tftp_start(enum proto_t protocol)
622 {
623 #if CONFIG_NET_TFTP_VARS
624 	char *ep;             /* Environment pointer */
625 
626 	/*
627 	 * Allow the user to choose TFTP blocksize and timeout.
628 	 * TFTP protocol has a minimal timeout of 1 second.
629 	 */
630 
631 	ep = env_get("tftpblocksize");
632 	if (ep != NULL)
633 		tftp_block_size_option = simple_strtol(ep, NULL, 10);
634 
635 	ep = env_get("tftptimeout");
636 	if (ep != NULL)
637 		timeout_ms = simple_strtol(ep, NULL, 10);
638 
639 	if (timeout_ms < 1000) {
640 		printf("TFTP timeout (%ld ms) too low, set min = 1000 ms\n",
641 		       timeout_ms);
642 		timeout_ms = 1000;
643 	}
644 
645 	ep = env_get("tftptimeoutcountmax");
646 	if (ep != NULL)
647 		tftp_timeout_count_max = simple_strtol(ep, NULL, 10);
648 
649 	if (tftp_timeout_count_max < 0) {
650 		printf("TFTP timeout count max (%d ms) negative, set to 0\n",
651 		       tftp_timeout_count_max);
652 		tftp_timeout_count_max = 0;
653 	}
654 #endif
655 
656 	debug("TFTP blocksize = %i, timeout = %ld ms\n",
657 	      tftp_block_size_option, timeout_ms);
658 
659 	tftp_remote_ip = net_server_ip;
660 	if (!net_parse_bootfile(&tftp_remote_ip, tftp_filename, MAX_LEN)) {
661 		sprintf(default_filename, "%02X%02X%02X%02X.img",
662 			net_ip.s_addr & 0xFF,
663 			(net_ip.s_addr >>  8) & 0xFF,
664 			(net_ip.s_addr >> 16) & 0xFF,
665 			(net_ip.s_addr >> 24) & 0xFF);
666 
667 		strncpy(tftp_filename, default_filename, DEFAULT_NAME_LEN);
668 		tftp_filename[DEFAULT_NAME_LEN - 1] = 0;
669 
670 		printf("*** Warning: no boot file name; using '%s'\n",
671 		       tftp_filename);
672 	}
673 
674 	printf("Using %s device\n", eth_get_name());
675 	printf("TFTP %s server %pI4; our IP address is %pI4",
676 #ifdef CONFIG_CMD_TFTPPUT
677 	       protocol == TFTPPUT ? "to" : "from",
678 #else
679 	       "from",
680 #endif
681 	       &tftp_remote_ip, &net_ip);
682 
683 	/* Check if we need to send across this subnet */
684 	if (net_gateway.s_addr && net_netmask.s_addr) {
685 		struct in_addr our_net;
686 		struct in_addr remote_net;
687 
688 		our_net.s_addr = net_ip.s_addr & net_netmask.s_addr;
689 		remote_net.s_addr = tftp_remote_ip.s_addr & net_netmask.s_addr;
690 		if (our_net.s_addr != remote_net.s_addr)
691 			printf("; sending through gateway %pI4", &net_gateway);
692 	}
693 	putc('\n');
694 
695 	printf("Filename '%s'.", tftp_filename);
696 
697 	if (net_boot_file_expected_size_in_blocks) {
698 		printf(" Size is 0x%x Bytes = ",
699 		       net_boot_file_expected_size_in_blocks << 9);
700 		print_size(net_boot_file_expected_size_in_blocks << 9, "");
701 	}
702 
703 	putc('\n');
704 #ifdef CONFIG_CMD_TFTPPUT
705 	tftp_put_active = (protocol == TFTPPUT);
706 	if (tftp_put_active) {
707 		printf("Save address: 0x%lx\n", save_addr);
708 		printf("Save size:    0x%lx\n", save_size);
709 		net_boot_file_size = save_size;
710 		puts("Saving: *\b");
711 		tftp_state = STATE_SEND_WRQ;
712 		new_transfer();
713 	} else
714 #endif
715 	{
716 		if (tftp_init_load_addr()) {
717 			eth_halt();
718 			net_set_state(NETLOOP_FAIL);
719 			puts("\nTFTP error: ");
720 			puts("trying to overwrite reserved memory...\n");
721 			return;
722 		}
723 		printf("Load address: 0x%lx\n", tftp_load_addr);
724 		puts("Loading: *\b");
725 		tftp_state = STATE_SEND_RRQ;
726 #ifdef CONFIG_CMD_BOOTEFI
727 		efi_set_bootdev("Net", "", tftp_filename);
728 #endif
729 	}
730 
731 	time_start = get_timer(0);
732 	timeout_count_max = tftp_timeout_count_max;
733 
734 	net_set_timeout_handler(timeout_ms, tftp_timeout_handler);
735 	net_set_udp_handler(tftp_handler);
736 #ifdef CONFIG_CMD_TFTPPUT
737 	net_set_icmp_handler(icmp_handler);
738 #endif
739 	tftp_remote_port = WELL_KNOWN_PORT;
740 	timeout_count = 0;
741 	/* Use a pseudo-random port unless a specific port is set */
742 	tftp_our_port = 1024 + (get_timer(0) % 3072);
743 
744 #ifdef CONFIG_TFTP_PORT
745 	ep = env_get("tftpdstp");
746 	if (ep != NULL)
747 		tftp_remote_port = simple_strtol(ep, NULL, 10);
748 	ep = env_get("tftpsrcp");
749 	if (ep != NULL)
750 		tftp_our_port = simple_strtol(ep, NULL, 10);
751 #endif
752 	tftp_cur_block = 0;
753 
754 	/* zero out server ether in case the server ip has changed */
755 	memset(net_server_ethaddr, 0, 6);
756 	/* Revert tftp_block_size to dflt */
757 	tftp_block_size = TFTP_BLOCK_SIZE;
758 #ifdef CONFIG_TFTP_TSIZE
759 	tftp_tsize = 0;
760 	tftp_tsize_num_hash = 0;
761 #endif
762 
763 	tftp_send();
764 }
765 
766 #ifdef CONFIG_CMD_TFTPSRV
767 void tftp_start_server(void)
768 {
769 	tftp_filename[0] = 0;
770 
771 	if (tftp_init_load_addr()) {
772 		eth_halt();
773 		net_set_state(NETLOOP_FAIL);
774 		puts("\nTFTP error: trying to overwrite reserved memory...\n");
775 		return;
776 	}
777 	printf("Using %s device\n", eth_get_name());
778 	printf("Listening for TFTP transfer on %pI4\n", &net_ip);
779 	printf("Load address: 0x%lx\n", tftp_load_addr);
780 
781 	puts("Loading: *\b");
782 
783 	timeout_count_max = tftp_timeout_count_max;
784 	timeout_count = 0;
785 	timeout_ms = TIMEOUT;
786 	net_set_timeout_handler(timeout_ms, tftp_timeout_handler);
787 
788 	/* Revert tftp_block_size to dflt */
789 	tftp_block_size = TFTP_BLOCK_SIZE;
790 	tftp_cur_block = 0;
791 	tftp_our_port = WELL_KNOWN_PORT;
792 
793 #ifdef CONFIG_TFTP_TSIZE
794 	tftp_tsize = 0;
795 	tftp_tsize_num_hash = 0;
796 #endif
797 
798 	tftp_state = STATE_RECV_WRQ;
799 	net_set_udp_handler(tftp_handler);
800 
801 	/* zero out server ether in case the server ip has changed */
802 	memset(net_server_ethaddr, 0, 6);
803 }
804 #endif /* CONFIG_CMD_TFTPSRV */
805 
806