xref: /openbmc/u-boot/net/tftp.c (revision f1bca34e)
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 /* Well known TFTP port # */
21 #define WELL_KNOWN_PORT	69
22 /* Millisecs to timeout for lost pkt */
23 #define TIMEOUT		5000UL
24 #ifndef	CONFIG_NET_RETRY_COUNT
25 /* # of timeouts before giving up */
26 # define TIMEOUT_COUNT	10
27 #else
28 # define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT * 2)
29 #endif
30 /* Number of "loading" hashes per line (for checking the image size) */
31 #define HASHES_PER_LINE	65
32 
33 /*
34  *	TFTP operations.
35  */
36 #define TFTP_RRQ	1
37 #define TFTP_WRQ	2
38 #define TFTP_DATA	3
39 #define TFTP_ACK	4
40 #define TFTP_ERROR	5
41 #define TFTP_OACK	6
42 
43 static ulong timeout_ms = TIMEOUT;
44 static int timeout_count_max = TIMEOUT_COUNT;
45 static ulong time_start;   /* Record time we started tftp */
46 
47 /*
48  * These globals govern the timeout behavior when attempting a connection to a
49  * TFTP server. tftp_timeout_ms specifies the number of milliseconds to
50  * wait for the server to respond to initial connection. Second global,
51  * tftp_timeout_count_max, gives the number of such connection retries.
52  * tftp_timeout_count_max must be non-negative and tftp_timeout_ms must be
53  * positive. The globals are meant to be set (and restored) by code needing
54  * non-standard timeout behavior when initiating a TFTP transfer.
55  */
56 ulong tftp_timeout_ms = TIMEOUT;
57 int tftp_timeout_count_max = TIMEOUT_COUNT;
58 
59 enum {
60 	TFTP_ERR_UNDEFINED           = 0,
61 	TFTP_ERR_FILE_NOT_FOUND      = 1,
62 	TFTP_ERR_ACCESS_DENIED       = 2,
63 	TFTP_ERR_DISK_FULL           = 3,
64 	TFTP_ERR_UNEXPECTED_OPCODE   = 4,
65 	TFTP_ERR_UNKNOWN_TRANSFER_ID  = 5,
66 	TFTP_ERR_FILE_ALREADY_EXISTS = 6,
67 };
68 
69 static struct in_addr tftp_remote_ip;
70 /* The UDP port at their end */
71 static int	tftp_remote_port;
72 /* The UDP port at our end */
73 static int	tftp_our_port;
74 static int	timeout_count;
75 /* packet sequence number */
76 static ulong	tftp_cur_block;
77 /* last packet sequence number received */
78 static ulong	tftp_prev_block;
79 /* count of sequence number wraparounds */
80 static ulong	tftp_block_wrap;
81 /* memory offset due to wrapping */
82 static ulong	tftp_block_wrap_offset;
83 static int	tftp_state;
84 #ifdef CONFIG_TFTP_TSIZE
85 /* The file size reported by the server */
86 static int	tftp_tsize;
87 /* The number of hashes we printed */
88 static short	tftp_tsize_num_hash;
89 #endif
90 #ifdef CONFIG_CMD_TFTPPUT
91 /* 1 if writing, else 0 */
92 static int	tftp_put_active;
93 /* 1 if we have sent the last block */
94 static int	tftp_put_final_block_sent;
95 #else
96 #define tftp_put_active	0
97 #endif
98 
99 #define STATE_SEND_RRQ	1
100 #define STATE_DATA	2
101 #define STATE_TOO_LARGE	3
102 #define STATE_BAD_MAGIC	4
103 #define STATE_OACK	5
104 #define STATE_RECV_WRQ	6
105 #define STATE_SEND_WRQ	7
106 
107 /* default TFTP block size */
108 #define TFTP_BLOCK_SIZE		512
109 /* sequence number is 16 bit */
110 #define TFTP_SEQUENCE_SIZE	((ulong)(1<<16))
111 
112 #define DEFAULT_NAME_LEN	(8 + 4 + 1)
113 static char default_filename[DEFAULT_NAME_LEN];
114 
115 #ifndef CONFIG_TFTP_FILE_NAME_MAX_LEN
116 #define MAX_LEN 128
117 #else
118 #define MAX_LEN CONFIG_TFTP_FILE_NAME_MAX_LEN
119 #endif
120 
121 static char tftp_filename[MAX_LEN];
122 
123 /* 512 is poor choice for ethernet, MTU is typically 1500.
124  * Minus eth.hdrs thats 1468.  Can get 2x better throughput with
125  * almost-MTU block sizes.  At least try... fall back to 512 if need be.
126  * (but those using CONFIG_IP_DEFRAG may want to set a larger block in cfg file)
127  */
128 #ifdef CONFIG_TFTP_BLOCKSIZE
129 #define TFTP_MTU_BLOCKSIZE CONFIG_TFTP_BLOCKSIZE
130 #else
131 #define TFTP_MTU_BLOCKSIZE 1468
132 #endif
133 
134 static unsigned short tftp_block_size = TFTP_BLOCK_SIZE;
135 static unsigned short tftp_block_size_option = TFTP_MTU_BLOCKSIZE;
136 
137 #ifdef CONFIG_MCAST_TFTP
138 #include <malloc.h>
139 #define MTFTP_BITMAPSIZE	0x1000
140 static unsigned *tftp_mcast_bitmap;
141 static int tftp_mcast_prev_hole;
142 static int tftp_mcast_bitmap_size = MTFTP_BITMAPSIZE;
143 static int tftp_mcast_disabled;
144 static int tftp_mcast_master_client;
145 static int tftp_mcast_active;
146 static int tftp_mcast_port;
147 /* can get 'last' block before done..*/
148 static ulong tftp_mcast_ending_block;
149 
150 static void parse_multicast_oack(char *pkt, int len);
151 
152 static void mcast_cleanup(void)
153 {
154 	if (net_mcast_addr)
155 		eth_mcast_join(net_mcast_addr, 0);
156 	if (tftp_mcast_bitmap)
157 		free(tftp_mcast_bitmap);
158 	tftp_mcast_bitmap = NULL;
159 	net_mcast_addr.s_addr = 0;
160 	tftp_mcast_active = 0;
161 	tftp_mcast_port = 0;
162 	tftp_mcast_ending_block = -1;
163 }
164 
165 #endif	/* CONFIG_MCAST_TFTP */
166 
167 static inline void store_block(int block, uchar *src, unsigned len)
168 {
169 	ulong offset = block * tftp_block_size + tftp_block_wrap_offset;
170 	ulong newsize = offset + len;
171 #ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
172 	int i, rc = 0;
173 
174 	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
175 		/* start address in flash? */
176 		if (flash_info[i].flash_id == FLASH_UNKNOWN)
177 			continue;
178 		if (load_addr + offset >= flash_info[i].start[0]) {
179 			rc = 1;
180 			break;
181 		}
182 	}
183 
184 	if (rc) { /* Flash is destination for this packet */
185 		rc = flash_write((char *)src, (ulong)(load_addr+offset), len);
186 		if (rc) {
187 			flash_perror(rc);
188 			net_set_state(NETLOOP_FAIL);
189 			return;
190 		}
191 	} else
192 #endif /* CONFIG_SYS_DIRECT_FLASH_TFTP */
193 	{
194 		void *ptr = map_sysmem(load_addr + offset, len);
195 
196 		memcpy(ptr, src, len);
197 		unmap_sysmem(ptr);
198 	}
199 #ifdef CONFIG_MCAST_TFTP
200 	if (tftp_mcast_active)
201 		ext2_set_bit(block, tftp_mcast_bitmap);
202 #endif
203 
204 	if (net_boot_file_size < newsize)
205 		net_boot_file_size = newsize;
206 }
207 
208 /* Clear our state ready for a new transfer */
209 static void new_transfer(void)
210 {
211 	tftp_prev_block = 0;
212 	tftp_block_wrap = 0;
213 	tftp_block_wrap_offset = 0;
214 #ifdef CONFIG_CMD_TFTPPUT
215 	tftp_put_final_block_sent = 0;
216 #endif
217 }
218 
219 #ifdef CONFIG_CMD_TFTPPUT
220 /**
221  * Load the next block from memory to be sent over tftp.
222  *
223  * @param block	Block number to send
224  * @param dst	Destination buffer for data
225  * @param len	Number of bytes in block (this one and every other)
226  * @return number of bytes loaded
227  */
228 static int load_block(unsigned block, uchar *dst, unsigned len)
229 {
230 	/* We may want to get the final block from the previous set */
231 	ulong offset = ((int)block - 1) * len + tftp_block_wrap_offset;
232 	ulong tosend = len;
233 
234 	tosend = min(net_boot_file_size - offset, tosend);
235 	(void)memcpy(dst, (void *)(save_addr + offset), tosend);
236 	debug("%s: block=%d, offset=%ld, len=%d, tosend=%ld\n", __func__,
237 	      block, offset, len, tosend);
238 	return tosend;
239 }
240 #endif
241 
242 static void tftp_send(void);
243 static void tftp_timeout_handler(void);
244 
245 /**********************************************************************/
246 
247 static void show_block_marker(void)
248 {
249 #ifdef CONFIG_TFTP_TSIZE
250 	if (tftp_tsize) {
251 		ulong pos = tftp_cur_block * tftp_block_size +
252 			tftp_block_wrap_offset;
253 		if (pos > tftp_tsize)
254 			pos = tftp_tsize;
255 
256 		while (tftp_tsize_num_hash < pos * 50 / tftp_tsize) {
257 			putc('#');
258 			tftp_tsize_num_hash++;
259 		}
260 	} else
261 #endif
262 	{
263 		if (((tftp_cur_block - 1) % 10) == 0)
264 			putc('#');
265 		else if ((tftp_cur_block % (10 * HASHES_PER_LINE)) == 0)
266 			puts("\n\t ");
267 	}
268 }
269 
270 /**
271  * restart the current transfer due to an error
272  *
273  * @param msg	Message to print for user
274  */
275 static void restart(const char *msg)
276 {
277 	printf("\n%s; starting again\n", msg);
278 #ifdef CONFIG_MCAST_TFTP
279 	mcast_cleanup();
280 #endif
281 	net_start_again();
282 }
283 
284 /*
285  * Check if the block number has wrapped, and update progress
286  *
287  * TODO: The egregious use of global variables in this file should be tidied.
288  */
289 static void update_block_number(void)
290 {
291 	/*
292 	 * RFC1350 specifies that the first data packet will
293 	 * have sequence number 1. If we receive a sequence
294 	 * number of 0 this means that there was a wrap
295 	 * around of the (16 bit) counter.
296 	 */
297 	if (tftp_cur_block == 0 && tftp_prev_block != 0) {
298 		tftp_block_wrap++;
299 		tftp_block_wrap_offset += tftp_block_size * TFTP_SEQUENCE_SIZE;
300 		timeout_count = 0; /* we've done well, reset the timeout */
301 	} else {
302 		show_block_marker();
303 	}
304 }
305 
306 /* The TFTP get or put is complete */
307 static void tftp_complete(void)
308 {
309 #ifdef CONFIG_TFTP_TSIZE
310 	/* Print hash marks for the last packet received */
311 	while (tftp_tsize && tftp_tsize_num_hash < 49) {
312 		putc('#');
313 		tftp_tsize_num_hash++;
314 	}
315 	puts("  ");
316 	print_size(tftp_tsize, "");
317 #endif
318 	time_start = get_timer(time_start);
319 	if (time_start > 0) {
320 		puts("\n\t ");	/* Line up with "Loading: " */
321 		print_size(net_boot_file_size /
322 			time_start * 1000, "/s");
323 	}
324 	puts("\ndone\n");
325 	net_set_state(NETLOOP_SUCCESS);
326 }
327 
328 static void tftp_send(void)
329 {
330 	uchar *pkt;
331 	uchar *xp;
332 	int len = 0;
333 	ushort *s;
334 
335 #ifdef CONFIG_MCAST_TFTP
336 	/* Multicast TFTP.. non-MasterClients do not ACK data. */
337 	if (tftp_mcast_active && tftp_state == STATE_DATA &&
338 	    tftp_mcast_master_client == 0)
339 		return;
340 #endif
341 	/*
342 	 *	We will always be sending some sort of packet, so
343 	 *	cobble together the packet headers now.
344 	 */
345 	pkt = net_tx_packet + net_eth_hdr_size() + IP_UDP_HDR_SIZE;
346 
347 	switch (tftp_state) {
348 	case STATE_SEND_RRQ:
349 	case STATE_SEND_WRQ:
350 		xp = pkt;
351 		s = (ushort *)pkt;
352 #ifdef CONFIG_CMD_TFTPPUT
353 		*s++ = htons(tftp_state == STATE_SEND_RRQ ? TFTP_RRQ :
354 			TFTP_WRQ);
355 #else
356 		*s++ = htons(TFTP_RRQ);
357 #endif
358 		pkt = (uchar *)s;
359 		strcpy((char *)pkt, tftp_filename);
360 		pkt += strlen(tftp_filename) + 1;
361 		strcpy((char *)pkt, "octet");
362 		pkt += 5 /*strlen("octet")*/ + 1;
363 		strcpy((char *)pkt, "timeout");
364 		pkt += 7 /*strlen("timeout")*/ + 1;
365 		sprintf((char *)pkt, "%lu", timeout_ms / 1000);
366 		debug("send option \"timeout %s\"\n", (char *)pkt);
367 		pkt += strlen((char *)pkt) + 1;
368 #ifdef CONFIG_TFTP_TSIZE
369 		pkt += sprintf((char *)pkt, "tsize%c%u%c",
370 				0, net_boot_file_size, 0);
371 #endif
372 		/* try for more effic. blk size */
373 		pkt += sprintf((char *)pkt, "blksize%c%d%c",
374 				0, tftp_block_size_option, 0);
375 #ifdef CONFIG_MCAST_TFTP
376 		/* Check all preconditions before even trying the option */
377 		if (!tftp_mcast_disabled) {
378 			tftp_mcast_bitmap = malloc(tftp_mcast_bitmap_size);
379 			if (tftp_mcast_bitmap && eth_get_dev()->mcast) {
380 				free(tftp_mcast_bitmap);
381 				tftp_mcast_bitmap = NULL;
382 				pkt += sprintf((char *)pkt, "multicast%c%c",
383 					0, 0);
384 			}
385 		}
386 #endif /* CONFIG_MCAST_TFTP */
387 		len = pkt - xp;
388 		break;
389 
390 	case STATE_OACK:
391 #ifdef CONFIG_MCAST_TFTP
392 		/* My turn!  Start at where I need blocks I missed. */
393 		if (tftp_mcast_active)
394 			tftp_cur_block = ext2_find_next_zero_bit(
395 				tftp_mcast_bitmap,
396 				tftp_mcast_bitmap_size * 8, 0);
397 		/* fall through */
398 #endif
399 
400 	case STATE_RECV_WRQ:
401 	case STATE_DATA:
402 		xp = pkt;
403 		s = (ushort *)pkt;
404 		s[0] = htons(TFTP_ACK);
405 		s[1] = htons(tftp_cur_block);
406 		pkt = (uchar *)(s + 2);
407 #ifdef CONFIG_CMD_TFTPPUT
408 		if (tftp_put_active) {
409 			int toload = tftp_block_size;
410 			int loaded = load_block(tftp_cur_block, pkt, toload);
411 
412 			s[0] = htons(TFTP_DATA);
413 			pkt += loaded;
414 			tftp_put_final_block_sent = (loaded < toload);
415 		}
416 #endif
417 		len = pkt - xp;
418 		break;
419 
420 	case STATE_TOO_LARGE:
421 		xp = pkt;
422 		s = (ushort *)pkt;
423 		*s++ = htons(TFTP_ERROR);
424 			*s++ = htons(3);
425 
426 		pkt = (uchar *)s;
427 		strcpy((char *)pkt, "File too large");
428 		pkt += 14 /*strlen("File too large")*/ + 1;
429 		len = pkt - xp;
430 		break;
431 
432 	case STATE_BAD_MAGIC:
433 		xp = pkt;
434 		s = (ushort *)pkt;
435 		*s++ = htons(TFTP_ERROR);
436 		*s++ = htons(2);
437 		pkt = (uchar *)s;
438 		strcpy((char *)pkt, "File has bad magic");
439 		pkt += 18 /*strlen("File has bad magic")*/ + 1;
440 		len = pkt - xp;
441 		break;
442 	}
443 
444 	net_send_udp_packet(net_server_ethaddr, tftp_remote_ip,
445 			    tftp_remote_port, tftp_our_port, len);
446 }
447 
448 #ifdef CONFIG_CMD_TFTPPUT
449 static void icmp_handler(unsigned type, unsigned code, unsigned dest,
450 			 struct in_addr sip, unsigned src, uchar *pkt,
451 			 unsigned len)
452 {
453 	if (type == ICMP_NOT_REACH && code == ICMP_NOT_REACH_PORT) {
454 		/* Oh dear the other end has gone away */
455 		restart("TFTP server died");
456 	}
457 }
458 #endif
459 
460 static void tftp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
461 			 unsigned src, unsigned len)
462 {
463 	__be16 proto;
464 	__be16 *s;
465 	int i;
466 
467 	if (dest != tftp_our_port) {
468 #ifdef CONFIG_MCAST_TFTP
469 		if (tftp_mcast_active &&
470 		    (!tftp_mcast_port || dest != tftp_mcast_port))
471 #endif
472 			return;
473 	}
474 	if (tftp_state != STATE_SEND_RRQ && src != tftp_remote_port &&
475 	    tftp_state != STATE_RECV_WRQ && tftp_state != STATE_SEND_WRQ)
476 		return;
477 
478 	if (len < 2)
479 		return;
480 	len -= 2;
481 	/* warning: don't use increment (++) in ntohs() macros!! */
482 	s = (__be16 *)pkt;
483 	proto = *s++;
484 	pkt = (uchar *)s;
485 	switch (ntohs(proto)) {
486 	case TFTP_RRQ:
487 		break;
488 
489 	case TFTP_ACK:
490 #ifdef CONFIG_CMD_TFTPPUT
491 		if (tftp_put_active) {
492 			if (tftp_put_final_block_sent) {
493 				tftp_complete();
494 			} else {
495 				/*
496 				 * Move to the next block. We want our block
497 				 * count to wrap just like the other end!
498 				 */
499 				int block = ntohs(*s);
500 				int ack_ok = (tftp_cur_block == block);
501 
502 				tftp_cur_block = (unsigned short)(block + 1);
503 				update_block_number();
504 				if (ack_ok)
505 					tftp_send(); /* Send next data block */
506 			}
507 		}
508 #endif
509 		break;
510 
511 	default:
512 		break;
513 
514 #ifdef CONFIG_CMD_TFTPSRV
515 	case TFTP_WRQ:
516 		debug("Got WRQ\n");
517 		tftp_remote_ip = sip;
518 		tftp_remote_port = src;
519 		tftp_our_port = 1024 + (get_timer(0) % 3072);
520 		new_transfer();
521 		tftp_send(); /* Send ACK(0) */
522 		break;
523 #endif
524 
525 	case TFTP_OACK:
526 		debug("Got OACK: %s %s\n",
527 		      pkt, pkt + strlen((char *)pkt) + 1);
528 		tftp_state = STATE_OACK;
529 		tftp_remote_port = src;
530 		/*
531 		 * Check for 'blksize' option.
532 		 * Careful: "i" is signed, "len" is unsigned, thus
533 		 * something like "len-8" may give a *huge* number
534 		 */
535 		for (i = 0; i+8 < len; i++) {
536 			if (strcmp((char *)pkt + i, "blksize") == 0) {
537 				tftp_block_size = (unsigned short)
538 					simple_strtoul((char *)pkt + i + 8,
539 						       NULL, 10);
540 				debug("Blocksize ack: %s, %d\n",
541 				      (char *)pkt + i + 8, tftp_block_size);
542 			}
543 #ifdef CONFIG_TFTP_TSIZE
544 			if (strcmp((char *)pkt+i, "tsize") == 0) {
545 				tftp_tsize = simple_strtoul((char *)pkt + i + 6,
546 							   NULL, 10);
547 				debug("size = %s, %d\n",
548 				      (char *)pkt + i + 6, tftp_tsize);
549 			}
550 #endif
551 		}
552 #ifdef CONFIG_MCAST_TFTP
553 		parse_multicast_oack((char *)pkt, len - 1);
554 		if ((tftp_mcast_active) && (!tftp_mcast_master_client))
555 			tftp_state = STATE_DATA;	/* passive.. */
556 		else
557 #endif
558 #ifdef CONFIG_CMD_TFTPPUT
559 		if (tftp_put_active) {
560 			/* Get ready to send the first block */
561 			tftp_state = STATE_DATA;
562 			tftp_cur_block++;
563 		}
564 #endif
565 		tftp_send(); /* Send ACK or first data block */
566 		break;
567 	case TFTP_DATA:
568 		if (len < 2)
569 			return;
570 		len -= 2;
571 		tftp_cur_block = ntohs(*(__be16 *)pkt);
572 
573 		update_block_number();
574 
575 		if (tftp_state == STATE_SEND_RRQ)
576 			debug("Server did not acknowledge timeout option!\n");
577 
578 		if (tftp_state == STATE_SEND_RRQ || tftp_state == STATE_OACK ||
579 		    tftp_state == STATE_RECV_WRQ) {
580 			/* first block received */
581 			tftp_state = STATE_DATA;
582 			tftp_remote_port = src;
583 			new_transfer();
584 
585 #ifdef CONFIG_MCAST_TFTP
586 			if (tftp_mcast_active) { /* start!=1 common if mcast */
587 				tftp_prev_block = tftp_cur_block - 1;
588 			} else
589 #endif
590 			if (tftp_cur_block != 1) {	/* Assertion */
591 				puts("\nTFTP error: ");
592 				printf("First block is not block 1 (%ld)\n",
593 				       tftp_cur_block);
594 				puts("Starting again\n\n");
595 				net_start_again();
596 				break;
597 			}
598 		}
599 
600 		if (tftp_cur_block == tftp_prev_block) {
601 			/* Same block again; ignore it. */
602 			break;
603 		}
604 
605 		tftp_prev_block = tftp_cur_block;
606 		timeout_count_max = tftp_timeout_count_max;
607 		net_set_timeout_handler(timeout_ms, tftp_timeout_handler);
608 
609 		store_block(tftp_cur_block - 1, pkt + 2, len);
610 
611 		/*
612 		 *	Acknowledge the block just received, which will prompt
613 		 *	the remote for the next one.
614 		 */
615 #ifdef CONFIG_MCAST_TFTP
616 		/* if I am the MasterClient, actively calculate what my next
617 		 * needed block is; else I'm passive; not ACKING
618 		 */
619 		if (tftp_mcast_active) {
620 			if (len < tftp_block_size)  {
621 				tftp_mcast_ending_block = tftp_cur_block;
622 			} else if (tftp_mcast_master_client) {
623 				tftp_mcast_prev_hole = ext2_find_next_zero_bit(
624 					tftp_mcast_bitmap,
625 					tftp_mcast_bitmap_size * 8,
626 					tftp_mcast_prev_hole);
627 				tftp_cur_block = tftp_mcast_prev_hole;
628 				if (tftp_cur_block >
629 				    ((tftp_mcast_bitmap_size * 8) - 1)) {
630 					debug("tftpfile too big\n");
631 					/* try to double it and retry */
632 					tftp_mcast_bitmap_size <<= 1;
633 					mcast_cleanup();
634 					net_start_again();
635 					return;
636 				}
637 				tftp_prev_block = tftp_cur_block;
638 			}
639 		}
640 #endif
641 		tftp_send();
642 
643 #ifdef CONFIG_MCAST_TFTP
644 		if (tftp_mcast_active) {
645 			if (tftp_mcast_master_client &&
646 			    (tftp_cur_block >= tftp_mcast_ending_block)) {
647 				puts("\nMulticast tftp done\n");
648 				mcast_cleanup();
649 				net_set_state(NETLOOP_SUCCESS);
650 			}
651 		} else
652 #endif
653 		if (len < tftp_block_size)
654 			tftp_complete();
655 		break;
656 
657 	case TFTP_ERROR:
658 		printf("\nTFTP error: '%s' (%d)\n",
659 		       pkt + 2, ntohs(*(__be16 *)pkt));
660 
661 		switch (ntohs(*(__be16 *)pkt)) {
662 		case TFTP_ERR_FILE_NOT_FOUND:
663 		case TFTP_ERR_ACCESS_DENIED:
664 			puts("Not retrying...\n");
665 			eth_halt();
666 			net_set_state(NETLOOP_FAIL);
667 			break;
668 		case TFTP_ERR_UNDEFINED:
669 		case TFTP_ERR_DISK_FULL:
670 		case TFTP_ERR_UNEXPECTED_OPCODE:
671 		case TFTP_ERR_UNKNOWN_TRANSFER_ID:
672 		case TFTP_ERR_FILE_ALREADY_EXISTS:
673 		default:
674 			puts("Starting again\n\n");
675 #ifdef CONFIG_MCAST_TFTP
676 			mcast_cleanup();
677 #endif
678 			net_start_again();
679 			break;
680 		}
681 		break;
682 	}
683 }
684 
685 
686 static void tftp_timeout_handler(void)
687 {
688 	if (++timeout_count > timeout_count_max) {
689 		restart("Retry count exceeded");
690 	} else {
691 		puts("T ");
692 		net_set_timeout_handler(timeout_ms, tftp_timeout_handler);
693 		if (tftp_state != STATE_RECV_WRQ)
694 			tftp_send();
695 	}
696 }
697 
698 
699 void tftp_start(enum proto_t protocol)
700 {
701 #if CONFIG_NET_TFTP_VARS
702 	char *ep;             /* Environment pointer */
703 
704 	/*
705 	 * Allow the user to choose TFTP blocksize and timeout.
706 	 * TFTP protocol has a minimal timeout of 1 second.
707 	 */
708 
709 	ep = env_get("tftpblocksize");
710 	if (ep != NULL)
711 		tftp_block_size_option = simple_strtol(ep, NULL, 10);
712 
713 	ep = env_get("tftptimeout");
714 	if (ep != NULL)
715 		timeout_ms = simple_strtol(ep, NULL, 10);
716 
717 	if (timeout_ms < 1000) {
718 		printf("TFTP timeout (%ld ms) too low, set min = 1000 ms\n",
719 		       timeout_ms);
720 		timeout_ms = 1000;
721 	}
722 
723 	ep = env_get("tftptimeoutcountmax");
724 	if (ep != NULL)
725 		tftp_timeout_count_max = simple_strtol(ep, NULL, 10);
726 
727 	if (tftp_timeout_count_max < 0) {
728 		printf("TFTP timeout count max (%d ms) negative, set to 0\n",
729 		       tftp_timeout_count_max);
730 		tftp_timeout_count_max = 0;
731 	}
732 #endif
733 
734 	debug("TFTP blocksize = %i, timeout = %ld ms\n",
735 	      tftp_block_size_option, timeout_ms);
736 
737 	tftp_remote_ip = net_server_ip;
738 	if (!net_parse_bootfile(&tftp_remote_ip, tftp_filename, MAX_LEN)) {
739 		sprintf(default_filename, "%02X%02X%02X%02X.img",
740 			net_ip.s_addr & 0xFF,
741 			(net_ip.s_addr >>  8) & 0xFF,
742 			(net_ip.s_addr >> 16) & 0xFF,
743 			(net_ip.s_addr >> 24) & 0xFF);
744 
745 		strncpy(tftp_filename, default_filename, DEFAULT_NAME_LEN);
746 		tftp_filename[DEFAULT_NAME_LEN - 1] = 0;
747 
748 		printf("*** Warning: no boot file name; using '%s'\n",
749 		       tftp_filename);
750 	}
751 
752 	printf("Using %s device\n", eth_get_name());
753 	printf("TFTP %s server %pI4; our IP address is %pI4",
754 #ifdef CONFIG_CMD_TFTPPUT
755 	       protocol == TFTPPUT ? "to" : "from",
756 #else
757 	       "from",
758 #endif
759 	       &tftp_remote_ip, &net_ip);
760 
761 	/* Check if we need to send across this subnet */
762 	if (net_gateway.s_addr && net_netmask.s_addr) {
763 		struct in_addr our_net;
764 		struct in_addr remote_net;
765 
766 		our_net.s_addr = net_ip.s_addr & net_netmask.s_addr;
767 		remote_net.s_addr = tftp_remote_ip.s_addr & net_netmask.s_addr;
768 		if (our_net.s_addr != remote_net.s_addr)
769 			printf("; sending through gateway %pI4", &net_gateway);
770 	}
771 	putc('\n');
772 
773 	printf("Filename '%s'.", tftp_filename);
774 
775 	if (net_boot_file_expected_size_in_blocks) {
776 		printf(" Size is 0x%x Bytes = ",
777 		       net_boot_file_expected_size_in_blocks << 9);
778 		print_size(net_boot_file_expected_size_in_blocks << 9, "");
779 	}
780 
781 	putc('\n');
782 #ifdef CONFIG_CMD_TFTPPUT
783 	tftp_put_active = (protocol == TFTPPUT);
784 	if (tftp_put_active) {
785 		printf("Save address: 0x%lx\n", save_addr);
786 		printf("Save size:    0x%lx\n", save_size);
787 		net_boot_file_size = save_size;
788 		puts("Saving: *\b");
789 		tftp_state = STATE_SEND_WRQ;
790 		new_transfer();
791 	} else
792 #endif
793 	{
794 		printf("Load address: 0x%lx\n", load_addr);
795 		puts("Loading: *\b");
796 		tftp_state = STATE_SEND_RRQ;
797 #ifdef CONFIG_CMD_BOOTEFI
798 		efi_set_bootdev("Net", "", tftp_filename);
799 #endif
800 	}
801 
802 	time_start = get_timer(0);
803 	timeout_count_max = tftp_timeout_count_max;
804 
805 	net_set_timeout_handler(timeout_ms, tftp_timeout_handler);
806 	net_set_udp_handler(tftp_handler);
807 #ifdef CONFIG_CMD_TFTPPUT
808 	net_set_icmp_handler(icmp_handler);
809 #endif
810 	tftp_remote_port = WELL_KNOWN_PORT;
811 	timeout_count = 0;
812 	/* Use a pseudo-random port unless a specific port is set */
813 	tftp_our_port = 1024 + (get_timer(0) % 3072);
814 
815 #ifdef CONFIG_TFTP_PORT
816 	ep = env_get("tftpdstp");
817 	if (ep != NULL)
818 		tftp_remote_port = simple_strtol(ep, NULL, 10);
819 	ep = env_get("tftpsrcp");
820 	if (ep != NULL)
821 		tftp_our_port = simple_strtol(ep, NULL, 10);
822 #endif
823 	tftp_cur_block = 0;
824 
825 	/* zero out server ether in case the server ip has changed */
826 	memset(net_server_ethaddr, 0, 6);
827 	/* Revert tftp_block_size to dflt */
828 	tftp_block_size = TFTP_BLOCK_SIZE;
829 #ifdef CONFIG_MCAST_TFTP
830 	mcast_cleanup();
831 #endif
832 #ifdef CONFIG_TFTP_TSIZE
833 	tftp_tsize = 0;
834 	tftp_tsize_num_hash = 0;
835 #endif
836 
837 	tftp_send();
838 }
839 
840 #ifdef CONFIG_CMD_TFTPSRV
841 void tftp_start_server(void)
842 {
843 	tftp_filename[0] = 0;
844 
845 	printf("Using %s device\n", eth_get_name());
846 	printf("Listening for TFTP transfer on %pI4\n", &net_ip);
847 	printf("Load address: 0x%lx\n", load_addr);
848 
849 	puts("Loading: *\b");
850 
851 	timeout_count_max = tftp_timeout_count_max;
852 	timeout_count = 0;
853 	timeout_ms = TIMEOUT;
854 	net_set_timeout_handler(timeout_ms, tftp_timeout_handler);
855 
856 	/* Revert tftp_block_size to dflt */
857 	tftp_block_size = TFTP_BLOCK_SIZE;
858 	tftp_cur_block = 0;
859 	tftp_our_port = WELL_KNOWN_PORT;
860 
861 #ifdef CONFIG_TFTP_TSIZE
862 	tftp_tsize = 0;
863 	tftp_tsize_num_hash = 0;
864 #endif
865 
866 	tftp_state = STATE_RECV_WRQ;
867 	net_set_udp_handler(tftp_handler);
868 
869 	/* zero out server ether in case the server ip has changed */
870 	memset(net_server_ethaddr, 0, 6);
871 }
872 #endif /* CONFIG_CMD_TFTPSRV */
873 
874 #ifdef CONFIG_MCAST_TFTP
875 /*
876  * Credits: atftp project.
877  */
878 
879 /*
880  * Pick up BcastAddr, Port, and whether I am [now] the master-client.
881  * Frame:
882  *    +-------+-----------+---+-------~~-------+---+
883  *    |  opc  | multicast | 0 | addr, port, mc | 0 |
884  *    +-------+-----------+---+-------~~-------+---+
885  * The multicast addr/port becomes what I listen to, and if 'mc' is '1' then
886  * I am the new master-client so must send ACKs to DataBlocks.  If I am not
887  * master-client, I'm a passive client, gathering what DataBlocks I may and
888  * making note of which ones I got in my bitmask.
889  * In theory, I never go from master->passive..
890  * .. this comes in with pkt already pointing just past opc
891  */
892 static void parse_multicast_oack(char *pkt, int len)
893 {
894 	int i;
895 	struct in_addr addr;
896 	char *mc_adr;
897 	char *port;
898 	char *mc;
899 
900 	mc_adr = NULL;
901 	port = NULL;
902 	mc = NULL;
903 	/* march along looking for 'multicast\0', which has to start at least
904 	 * 14 bytes back from the end.
905 	 */
906 	for (i = 0; i < len - 14; i++)
907 		if (strcmp(pkt + i, "multicast") == 0)
908 			break;
909 	if (i >= (len - 14)) /* non-Multicast OACK, ign. */
910 		return;
911 
912 	i += 10; /* strlen multicast */
913 	mc_adr = pkt + i;
914 	for (; i < len; i++) {
915 		if (*(pkt + i) == ',') {
916 			*(pkt + i) = '\0';
917 			if (port) {
918 				mc = pkt + i + 1;
919 				break;
920 			} else {
921 				port = pkt + i + 1;
922 			}
923 		}
924 	}
925 	if (!port || !mc_adr || !mc)
926 		return;
927 	if (tftp_mcast_active && tftp_mcast_master_client) {
928 		printf("I got a OACK as master Client, WRONG!\n");
929 		return;
930 	}
931 	/* ..I now accept packets destined for this MCAST addr, port */
932 	if (!tftp_mcast_active) {
933 		if (tftp_mcast_bitmap) {
934 			printf("Internal failure! no mcast.\n");
935 			free(tftp_mcast_bitmap);
936 			tftp_mcast_bitmap = NULL;
937 			tftp_mcast_disabled = 1;
938 			return;
939 		}
940 		/* I malloc instead of pre-declare; so that if the file ends
941 		 * up being too big for this bitmap I can retry
942 		 */
943 		tftp_mcast_bitmap = malloc(tftp_mcast_bitmap_size);
944 		if (!tftp_mcast_bitmap) {
945 			printf("No bitmap, no multicast. Sorry.\n");
946 			tftp_mcast_disabled = 1;
947 			return;
948 		}
949 		memset(tftp_mcast_bitmap, 0, tftp_mcast_bitmap_size);
950 		tftp_mcast_prev_hole = 0;
951 		tftp_mcast_active = 1;
952 	}
953 	addr = string_to_ip(mc_adr);
954 	if (net_mcast_addr.s_addr != addr.s_addr) {
955 		if (net_mcast_addr.s_addr)
956 			eth_mcast_join(net_mcast_addr, 0);
957 		net_mcast_addr = addr;
958 		if (eth_mcast_join(net_mcast_addr, 1)) {
959 			printf("Fail to set mcast, revert to TFTP\n");
960 			tftp_mcast_disabled = 1;
961 			mcast_cleanup();
962 			net_start_again();
963 		}
964 	}
965 	tftp_mcast_master_client = simple_strtoul((char *)mc, NULL, 10);
966 	tftp_mcast_port = (unsigned short)simple_strtoul(port, NULL, 10);
967 	printf("Multicast: %s:%d [%d]\n", mc_adr, tftp_mcast_port,
968 	       tftp_mcast_master_client);
969 	return;
970 }
971 
972 #endif /* Multicast TFTP */
973