xref: /openbmc/u-boot/net/nfs.c (revision d81b27a2) 
1 /*
2  * NFS support driver - based on etherboot and U-BOOT's tftp.c
3  *
4  * Masami Komiya <mkomiya@sonare.it> 2004
5  *
6  */
7 
8 /* NOTE: the NFS code is heavily inspired by the NetBSD netboot code (read:
9  * large portions are copied verbatim) as distributed in OSKit 0.97.  A few
10  * changes were necessary to adapt the code to Etherboot and to fix several
11  * inconsistencies.  Also the RPC message preparation is done "by hand" to
12  * avoid adding netsprintf() which I find hard to understand and use.  */
13 
14 /* NOTE 2: Etherboot does not care about things beyond the kernel image, so
15  * it loads the kernel image off the boot server (ARP_SERVER) and does not
16  * access the client root disk (root-path in dhcpd.conf), which would use
17  * ARP_ROOTSERVER.  The root disk is something the operating system we are
18  * about to load needs to use.	This is different from the OSKit 0.97 logic.  */
19 
20 /* NOTE 3: Symlink handling introduced by Anselm M Hoffmeister, 2003-July-14
21  * If a symlink is encountered, it is followed as far as possible (recursion
22  * possible, maximum 16 steps). There is no clearing of ".."'s inside the
23  * path, so please DON'T DO THAT. thx. */
24 
25 #include <common.h>
26 #include <command.h>
27 #include <net.h>
28 #include <malloc.h>
29 #include "nfs.h"
30 #include "bootp.h"
31 
32 #define HASHES_PER_LINE 65	/* Number of "loading" hashes per line	*/
33 #define NFS_RETRY_COUNT 30
34 #ifndef CONFIG_NFS_TIMEOUT
35 # define NFS_TIMEOUT 2000UL
36 #else
37 # define NFS_TIMEOUT CONFIG_NFS_TIMEOUT
38 #endif
39 
40 static int fs_mounted;
41 static unsigned long rpc_id;
42 static int nfs_offset = -1;
43 static int nfs_len;
44 
45 static char dirfh[NFS_FHSIZE];	/* file handle of directory */
46 static char filefh[NFS_FHSIZE]; /* file handle of kernel image */
47 
48 static enum net_loop_state nfs_download_state;
49 static IPaddr_t NfsServerIP;
50 static int	NfsSrvMountPort;
51 static int	NfsSrvNfsPort;
52 static int	NfsOurPort;
53 static int	NfsTimeoutCount;
54 static int	NfsState;
55 #define STATE_PRCLOOKUP_PROG_MOUNT_REQ	1
56 #define STATE_PRCLOOKUP_PROG_NFS_REQ	2
57 #define STATE_MOUNT_REQ			3
58 #define STATE_UMOUNT_REQ		4
59 #define STATE_LOOKUP_REQ		5
60 #define STATE_READ_REQ			6
61 #define STATE_READLINK_REQ		7
62 
63 static char default_filename[64];
64 static char *nfs_filename;
65 static char *nfs_path;
66 static char nfs_path_buff[2048];
67 
68 static inline int
69 store_block(uchar *src, unsigned offset, unsigned len)
70 {
71 	ulong newsize = offset + len;
72 #ifdef CONFIG_SYS_DIRECT_FLASH_NFS
73 	int i, rc = 0;
74 
75 	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
76 		/* start address in flash? */
77 		if (load_addr + offset >= flash_info[i].start[0]) {
78 			rc = 1;
79 			break;
80 		}
81 	}
82 
83 	if (rc) { /* Flash is destination for this packet */
84 		rc = flash_write((uchar *)src, (ulong)(load_addr+offset), len);
85 		if (rc) {
86 			flash_perror(rc);
87 			return -1;
88 		}
89 	} else
90 #endif /* CONFIG_SYS_DIRECT_FLASH_NFS */
91 	{
92 		(void)memcpy((void *)(load_addr + offset), src, len);
93 	}
94 
95 	if (NetBootFileXferSize < (offset+len))
96 		NetBootFileXferSize = newsize;
97 	return 0;
98 }
99 
100 static char*
101 basename(char *path)
102 {
103 	char *fname;
104 
105 	fname = path + strlen(path) - 1;
106 	while (fname >= path) {
107 		if (*fname == '/') {
108 			fname++;
109 			break;
110 		}
111 		fname--;
112 	}
113 	return fname;
114 }
115 
116 static char*
117 dirname(char *path)
118 {
119 	char *fname;
120 
121 	fname = basename(path);
122 	--fname;
123 	*fname = '\0';
124 	return path;
125 }
126 
127 /**************************************************************************
128 RPC_ADD_CREDENTIALS - Add RPC authentication/verifier entries
129 **************************************************************************/
130 static long *rpc_add_credentials(long *p)
131 {
132 	int hl;
133 	int hostnamelen;
134 	char hostname[256];
135 
136 	strcpy(hostname, "");
137 	hostnamelen = strlen(hostname);
138 
139 	/* Here's the executive summary on authentication requirements of the
140 	 * various NFS server implementations:	Linux accepts both AUTH_NONE
141 	 * and AUTH_UNIX authentication (also accepts an empty hostname field
142 	 * in the AUTH_UNIX scheme).  *BSD refuses AUTH_NONE, but accepts
143 	 * AUTH_UNIX (also accepts an empty hostname field in the AUTH_UNIX
144 	 * scheme).  To be safe, use AUTH_UNIX and pass the hostname if we have
145 	 * it (if the BOOTP/DHCP reply didn't give one, just use an empty
146 	 * hostname).  */
147 
148 	hl = (hostnamelen + 3) & ~3;
149 
150 	/* Provide an AUTH_UNIX credential.  */
151 	*p++ = htonl(1);		/* AUTH_UNIX */
152 	*p++ = htonl(hl+20);		/* auth length */
153 	*p++ = htonl(0);		/* stamp */
154 	*p++ = htonl(hostnamelen);	/* hostname string */
155 	if (hostnamelen & 3)
156 		*(p + hostnamelen / 4) = 0; /* add zero padding */
157 	memcpy(p, hostname, hostnamelen);
158 	p += hl / 4;
159 	*p++ = 0;			/* uid */
160 	*p++ = 0;			/* gid */
161 	*p++ = 0;			/* auxiliary gid list */
162 
163 	/* Provide an AUTH_NONE verifier.  */
164 	*p++ = 0;			/* AUTH_NONE */
165 	*p++ = 0;			/* auth length */
166 
167 	return p;
168 }
169 
170 /**************************************************************************
171 RPC_LOOKUP - Lookup RPC Port numbers
172 **************************************************************************/
173 static void
174 rpc_req(int rpc_prog, int rpc_proc, uint32_t *data, int datalen)
175 {
176 	struct rpc_t pkt;
177 	unsigned long id;
178 	uint32_t *p;
179 	int pktlen;
180 	int sport;
181 
182 	id = ++rpc_id;
183 	pkt.u.call.id = htonl(id);
184 	pkt.u.call.type = htonl(MSG_CALL);
185 	pkt.u.call.rpcvers = htonl(2);	/* use RPC version 2 */
186 	pkt.u.call.prog = htonl(rpc_prog);
187 	pkt.u.call.vers = htonl(2);	/* portmapper is version 2 */
188 	pkt.u.call.proc = htonl(rpc_proc);
189 	p = (uint32_t *)&(pkt.u.call.data);
190 
191 	if (datalen)
192 		memcpy((char *)p, (char *)data, datalen*sizeof(uint32_t));
193 
194 	pktlen = (char *)p + datalen*sizeof(uint32_t) - (char *)&pkt;
195 
196 	memcpy((char *)NetTxPacket + NetEthHdrSize() + IP_UDP_HDR_SIZE,
197 		(char *)&pkt, pktlen);
198 
199 	if (rpc_prog == PROG_PORTMAP)
200 		sport = SUNRPC_PORT;
201 	else if (rpc_prog == PROG_MOUNT)
202 		sport = NfsSrvMountPort;
203 	else
204 		sport = NfsSrvNfsPort;
205 
206 	NetSendUDPPacket(NetServerEther, NfsServerIP, sport, NfsOurPort,
207 		pktlen);
208 }
209 
210 /**************************************************************************
211 RPC_LOOKUP - Lookup RPC Port numbers
212 **************************************************************************/
213 static void
214 rpc_lookup_req(int prog, int ver)
215 {
216 	uint32_t data[16];
217 
218 	data[0] = 0; data[1] = 0;	/* auth credential */
219 	data[2] = 0; data[3] = 0;	/* auth verifier */
220 	data[4] = htonl(prog);
221 	data[5] = htonl(ver);
222 	data[6] = htonl(17);	/* IP_UDP */
223 	data[7] = 0;
224 
225 	rpc_req(PROG_PORTMAP, PORTMAP_GETPORT, data, 8);
226 }
227 
228 /**************************************************************************
229 NFS_MOUNT - Mount an NFS Filesystem
230 **************************************************************************/
231 static void
232 nfs_mount_req(char *path)
233 {
234 	uint32_t data[1024];
235 	uint32_t *p;
236 	int len;
237 	int pathlen;
238 
239 	pathlen = strlen(path);
240 
241 	p = &(data[0]);
242 	p = (uint32_t *)rpc_add_credentials((long *)p);
243 
244 	*p++ = htonl(pathlen);
245 	if (pathlen & 3)
246 		*(p + pathlen / 4) = 0;
247 	memcpy(p, path, pathlen);
248 	p += (pathlen + 3) / 4;
249 
250 	len = (uint32_t *)p - (uint32_t *)&(data[0]);
251 
252 	rpc_req(PROG_MOUNT, MOUNT_ADDENTRY, data, len);
253 }
254 
255 /**************************************************************************
256 NFS_UMOUNTALL - Unmount all our NFS Filesystems on the Server
257 **************************************************************************/
258 static void
259 nfs_umountall_req(void)
260 {
261 	uint32_t data[1024];
262 	uint32_t *p;
263 	int len;
264 
265 	if ((NfsSrvMountPort == -1) || (!fs_mounted))
266 		/* Nothing mounted, nothing to umount */
267 		return;
268 
269 	p = &(data[0]);
270 	p = (uint32_t *)rpc_add_credentials((long *)p);
271 
272 	len = (uint32_t *)p - (uint32_t *)&(data[0]);
273 
274 	rpc_req(PROG_MOUNT, MOUNT_UMOUNTALL, data, len);
275 }
276 
277 /***************************************************************************
278  * NFS_READLINK (AH 2003-07-14)
279  * This procedure is called when read of the first block fails -
280  * this probably happens when it's a directory or a symlink
281  * In case of successful readlink(), the dirname is manipulated,
282  * so that inside the nfs() function a recursion can be done.
283  **************************************************************************/
284 static void
285 nfs_readlink_req(void)
286 {
287 	uint32_t data[1024];
288 	uint32_t *p;
289 	int len;
290 
291 	p = &(data[0]);
292 	p = (uint32_t *)rpc_add_credentials((long *)p);
293 
294 	memcpy(p, filefh, NFS_FHSIZE);
295 	p += (NFS_FHSIZE / 4);
296 
297 	len = (uint32_t *)p - (uint32_t *)&(data[0]);
298 
299 	rpc_req(PROG_NFS, NFS_READLINK, data, len);
300 }
301 
302 /**************************************************************************
303 NFS_LOOKUP - Lookup Pathname
304 **************************************************************************/
305 static void
306 nfs_lookup_req(char *fname)
307 {
308 	uint32_t data[1024];
309 	uint32_t *p;
310 	int len;
311 	int fnamelen;
312 
313 	fnamelen = strlen(fname);
314 
315 	p = &(data[0]);
316 	p = (uint32_t *)rpc_add_credentials((long *)p);
317 
318 	memcpy(p, dirfh, NFS_FHSIZE);
319 	p += (NFS_FHSIZE / 4);
320 	*p++ = htonl(fnamelen);
321 	if (fnamelen & 3)
322 		*(p + fnamelen / 4) = 0;
323 	memcpy(p, fname, fnamelen);
324 	p += (fnamelen + 3) / 4;
325 
326 	len = (uint32_t *)p - (uint32_t *)&(data[0]);
327 
328 	rpc_req(PROG_NFS, NFS_LOOKUP, data, len);
329 }
330 
331 /**************************************************************************
332 NFS_READ - Read File on NFS Server
333 **************************************************************************/
334 static void
335 nfs_read_req(int offset, int readlen)
336 {
337 	uint32_t data[1024];
338 	uint32_t *p;
339 	int len;
340 
341 	p = &(data[0]);
342 	p = (uint32_t *)rpc_add_credentials((long *)p);
343 
344 	memcpy(p, filefh, NFS_FHSIZE);
345 	p += (NFS_FHSIZE / 4);
346 	*p++ = htonl(offset);
347 	*p++ = htonl(readlen);
348 	*p++ = 0;
349 
350 	len = (uint32_t *)p - (uint32_t *)&(data[0]);
351 
352 	rpc_req(PROG_NFS, NFS_READ, data, len);
353 }
354 
355 /**************************************************************************
356 RPC request dispatcher
357 **************************************************************************/
358 
359 static void
360 NfsSend(void)
361 {
362 	debug("%s\n", __func__);
363 
364 	switch (NfsState) {
365 	case STATE_PRCLOOKUP_PROG_MOUNT_REQ:
366 		rpc_lookup_req(PROG_MOUNT, 1);
367 		break;
368 	case STATE_PRCLOOKUP_PROG_NFS_REQ:
369 		rpc_lookup_req(PROG_NFS, 2);
370 		break;
371 	case STATE_MOUNT_REQ:
372 		nfs_mount_req(nfs_path);
373 		break;
374 	case STATE_UMOUNT_REQ:
375 		nfs_umountall_req();
376 		break;
377 	case STATE_LOOKUP_REQ:
378 		nfs_lookup_req(nfs_filename);
379 		break;
380 	case STATE_READ_REQ:
381 		nfs_read_req(nfs_offset, nfs_len);
382 		break;
383 	case STATE_READLINK_REQ:
384 		nfs_readlink_req();
385 		break;
386 	}
387 }
388 
389 /**************************************************************************
390 Handlers for the reply from server
391 **************************************************************************/
392 
393 static int
394 rpc_lookup_reply(int prog, uchar *pkt, unsigned len)
395 {
396 	struct rpc_t rpc_pkt;
397 
398 	memcpy((unsigned char *)&rpc_pkt, pkt, len);
399 
400 	debug("%s\n", __func__);
401 
402 	if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
403 		return -1;
404 
405 	if (rpc_pkt.u.reply.rstatus  ||
406 	    rpc_pkt.u.reply.verifier ||
407 	    rpc_pkt.u.reply.astatus)
408 		return -1;
409 
410 	switch (prog) {
411 	case PROG_MOUNT:
412 		NfsSrvMountPort = ntohl(rpc_pkt.u.reply.data[0]);
413 		break;
414 	case PROG_NFS:
415 		NfsSrvNfsPort = ntohl(rpc_pkt.u.reply.data[0]);
416 		break;
417 	}
418 
419 	return 0;
420 }
421 
422 static int
423 nfs_mount_reply(uchar *pkt, unsigned len)
424 {
425 	struct rpc_t rpc_pkt;
426 
427 	debug("%s\n", __func__);
428 
429 	memcpy((unsigned char *)&rpc_pkt, pkt, len);
430 
431 	if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
432 		return -1;
433 
434 	if (rpc_pkt.u.reply.rstatus  ||
435 	    rpc_pkt.u.reply.verifier ||
436 	    rpc_pkt.u.reply.astatus  ||
437 	    rpc_pkt.u.reply.data[0])
438 		return -1;
439 
440 	fs_mounted = 1;
441 	memcpy(dirfh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
442 
443 	return 0;
444 }
445 
446 static int
447 nfs_umountall_reply(uchar *pkt, unsigned len)
448 {
449 	struct rpc_t rpc_pkt;
450 
451 	debug("%s\n", __func__);
452 
453 	memcpy((unsigned char *)&rpc_pkt, pkt, len);
454 
455 	if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
456 		return -1;
457 
458 	if (rpc_pkt.u.reply.rstatus  ||
459 	    rpc_pkt.u.reply.verifier ||
460 	    rpc_pkt.u.reply.astatus)
461 		return -1;
462 
463 	fs_mounted = 0;
464 	memset(dirfh, 0, sizeof(dirfh));
465 
466 	return 0;
467 }
468 
469 static int
470 nfs_lookup_reply(uchar *pkt, unsigned len)
471 {
472 	struct rpc_t rpc_pkt;
473 
474 	debug("%s\n", __func__);
475 
476 	memcpy((unsigned char *)&rpc_pkt, pkt, len);
477 
478 	if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
479 		return -1;
480 
481 	if (rpc_pkt.u.reply.rstatus  ||
482 	    rpc_pkt.u.reply.verifier ||
483 	    rpc_pkt.u.reply.astatus  ||
484 	    rpc_pkt.u.reply.data[0])
485 		return -1;
486 
487 	memcpy(filefh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
488 
489 	return 0;
490 }
491 
492 static int
493 nfs_readlink_reply(uchar *pkt, unsigned len)
494 {
495 	struct rpc_t rpc_pkt;
496 	int rlen;
497 
498 	debug("%s\n", __func__);
499 
500 	memcpy((unsigned char *)&rpc_pkt, pkt, len);
501 
502 	if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
503 		return -1;
504 
505 	if (rpc_pkt.u.reply.rstatus  ||
506 	    rpc_pkt.u.reply.verifier ||
507 	    rpc_pkt.u.reply.astatus  ||
508 	    rpc_pkt.u.reply.data[0])
509 		return -1;
510 
511 	rlen = ntohl(rpc_pkt.u.reply.data[1]); /* new path length */
512 
513 	if (*((char *)&(rpc_pkt.u.reply.data[2])) != '/') {
514 		int pathlen;
515 		strcat(nfs_path, "/");
516 		pathlen = strlen(nfs_path);
517 		memcpy(nfs_path + pathlen, (uchar *)&(rpc_pkt.u.reply.data[2]),
518 			rlen);
519 		nfs_path[pathlen + rlen] = 0;
520 	} else {
521 		memcpy(nfs_path, (uchar *)&(rpc_pkt.u.reply.data[2]), rlen);
522 		nfs_path[rlen] = 0;
523 	}
524 	return 0;
525 }
526 
527 static int
528 nfs_read_reply(uchar *pkt, unsigned len)
529 {
530 	struct rpc_t rpc_pkt;
531 	int rlen;
532 
533 	debug("%s\n", __func__);
534 
535 	memcpy((uchar *)&rpc_pkt, pkt, sizeof(rpc_pkt.u.reply));
536 
537 	if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
538 		return -1;
539 
540 	if (rpc_pkt.u.reply.rstatus  ||
541 	    rpc_pkt.u.reply.verifier ||
542 	    rpc_pkt.u.reply.astatus  ||
543 	    rpc_pkt.u.reply.data[0]) {
544 		if (rpc_pkt.u.reply.rstatus)
545 			return -9999;
546 		if (rpc_pkt.u.reply.astatus)
547 			return -9999;
548 		return -ntohl(rpc_pkt.u.reply.data[0]);
549 	}
550 
551 	if ((nfs_offset != 0) && !((nfs_offset) %
552 			(NFS_READ_SIZE / 2 * 10 * HASHES_PER_LINE)))
553 		puts("\n\t ");
554 	if (!(nfs_offset % ((NFS_READ_SIZE / 2) * 10)))
555 		putc('#');
556 
557 	rlen = ntohl(rpc_pkt.u.reply.data[18]);
558 	if (store_block((uchar *)pkt + sizeof(rpc_pkt.u.reply),
559 			nfs_offset, rlen))
560 		return -9999;
561 
562 	return rlen;
563 }
564 
565 /**************************************************************************
566 Interfaces of U-BOOT
567 **************************************************************************/
568 
569 static void
570 NfsTimeout(void)
571 {
572 	if (++NfsTimeoutCount > NFS_RETRY_COUNT) {
573 		puts("\nRetry count exceeded; starting again\n");
574 		NetStartAgain();
575 	} else {
576 		puts("T ");
577 		NetSetTimeout(NFS_TIMEOUT, NfsTimeout);
578 		NfsSend();
579 	}
580 }
581 
582 static void
583 NfsHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, unsigned len)
584 {
585 	int rlen;
586 
587 	debug("%s\n", __func__);
588 
589 	if (dest != NfsOurPort)
590 		return;
591 
592 	switch (NfsState) {
593 	case STATE_PRCLOOKUP_PROG_MOUNT_REQ:
594 		rpc_lookup_reply(PROG_MOUNT, pkt, len);
595 		NfsState = STATE_PRCLOOKUP_PROG_NFS_REQ;
596 		NfsSend();
597 		break;
598 
599 	case STATE_PRCLOOKUP_PROG_NFS_REQ:
600 		rpc_lookup_reply(PROG_NFS, pkt, len);
601 		NfsState = STATE_MOUNT_REQ;
602 		NfsSend();
603 		break;
604 
605 	case STATE_MOUNT_REQ:
606 		if (nfs_mount_reply(pkt, len)) {
607 			puts("*** ERROR: Cannot mount\n");
608 			/* just to be sure... */
609 			NfsState = STATE_UMOUNT_REQ;
610 			NfsSend();
611 		} else {
612 			NfsState = STATE_LOOKUP_REQ;
613 			NfsSend();
614 		}
615 		break;
616 
617 	case STATE_UMOUNT_REQ:
618 		if (nfs_umountall_reply(pkt, len)) {
619 			puts("*** ERROR: Cannot umount\n");
620 			net_set_state(NETLOOP_FAIL);
621 		} else {
622 			puts("\ndone\n");
623 			net_set_state(nfs_download_state);
624 		}
625 		break;
626 
627 	case STATE_LOOKUP_REQ:
628 		if (nfs_lookup_reply(pkt, len)) {
629 			puts("*** ERROR: File lookup fail\n");
630 			NfsState = STATE_UMOUNT_REQ;
631 			NfsSend();
632 		} else {
633 			NfsState = STATE_READ_REQ;
634 			nfs_offset = 0;
635 			nfs_len = NFS_READ_SIZE;
636 			NfsSend();
637 		}
638 		break;
639 
640 	case STATE_READLINK_REQ:
641 		if (nfs_readlink_reply(pkt, len)) {
642 			puts("*** ERROR: Symlink fail\n");
643 			NfsState = STATE_UMOUNT_REQ;
644 			NfsSend();
645 		} else {
646 			debug("Symlink --> %s\n", nfs_path);
647 			nfs_filename = basename(nfs_path);
648 			nfs_path     = dirname(nfs_path);
649 
650 			NfsState = STATE_MOUNT_REQ;
651 			NfsSend();
652 		}
653 		break;
654 
655 	case STATE_READ_REQ:
656 		rlen = nfs_read_reply(pkt, len);
657 		NetSetTimeout(NFS_TIMEOUT, NfsTimeout);
658 		if (rlen > 0) {
659 			nfs_offset += rlen;
660 			NfsSend();
661 		} else if ((rlen == -NFSERR_ISDIR) || (rlen == -NFSERR_INVAL)) {
662 			/* symbolic link */
663 			NfsState = STATE_READLINK_REQ;
664 			NfsSend();
665 		} else {
666 			if (!rlen)
667 				nfs_download_state = NETLOOP_SUCCESS;
668 			NfsState = STATE_UMOUNT_REQ;
669 			NfsSend();
670 		}
671 		break;
672 	}
673 }
674 
675 
676 void
677 NfsStart(void)
678 {
679 	debug("%s\n", __func__);
680 	nfs_download_state = NETLOOP_FAIL;
681 
682 	NfsServerIP = NetServerIP;
683 	nfs_path = (char *)nfs_path_buff;
684 
685 	if (nfs_path == NULL) {
686 		net_set_state(NETLOOP_FAIL);
687 		puts("*** ERROR: Fail allocate memory\n");
688 		return;
689 	}
690 
691 	if (BootFile[0] == '\0') {
692 		sprintf(default_filename, "/nfsroot/%02X%02X%02X%02X.img",
693 			NetOurIP & 0xFF,
694 			(NetOurIP >>  8) & 0xFF,
695 			(NetOurIP >> 16) & 0xFF,
696 			(NetOurIP >> 24) & 0xFF);
697 		strcpy(nfs_path, default_filename);
698 
699 		printf("*** Warning: no boot file name; using '%s'\n",
700 			nfs_path);
701 	} else {
702 		char *p = BootFile;
703 
704 		p = strchr(p, ':');
705 
706 		if (p != NULL) {
707 			NfsServerIP = string_to_ip(BootFile);
708 			++p;
709 			strcpy(nfs_path, p);
710 		} else {
711 			strcpy(nfs_path, BootFile);
712 		}
713 	}
714 
715 	nfs_filename = basename(nfs_path);
716 	nfs_path     = dirname(nfs_path);
717 
718 	printf("Using %s device\n", eth_get_name());
719 
720 	printf("File transfer via NFS from server %pI4"
721 		"; our IP address is %pI4", &NfsServerIP, &NetOurIP);
722 
723 	/* Check if we need to send across this subnet */
724 	if (NetOurGatewayIP && NetOurSubnetMask) {
725 		IPaddr_t OurNet	    = NetOurIP	  & NetOurSubnetMask;
726 		IPaddr_t ServerNet  = NetServerIP & NetOurSubnetMask;
727 
728 		if (OurNet != ServerNet)
729 			printf("; sending through gateway %pI4",
730 				&NetOurGatewayIP);
731 	}
732 	printf("\nFilename '%s/%s'.", nfs_path, nfs_filename);
733 
734 	if (NetBootFileSize) {
735 		printf(" Size is 0x%x Bytes = ", NetBootFileSize<<9);
736 		print_size(NetBootFileSize<<9, "");
737 	}
738 	printf("\nLoad address: 0x%lx\n"
739 		"Loading: *\b", load_addr);
740 
741 	NetSetTimeout(NFS_TIMEOUT, NfsTimeout);
742 	net_set_udp_handler(NfsHandler);
743 
744 	NfsTimeoutCount = 0;
745 	NfsState = STATE_PRCLOOKUP_PROG_MOUNT_REQ;
746 
747 	/*NfsOurPort = 4096 + (get_ticks() % 3072);*/
748 	/*FIX ME !!!*/
749 	NfsOurPort = 1000;
750 
751 	/* zero out server ether in case the server ip has changed */
752 	memset(NetServerEther, 0, 6);
753 
754 	NfsSend();
755 }
756