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* Patch by Rune Torgersen, 13 Feb 2003:
[u-boot.git] / net / bootp.c
CommitLineData
3861aa5c
WD		 1/*
2 * Based on LiMon - BOOTP.
3 *
4 * Copyright 1994, 1995, 2000 Neil Russell.
5 * (See License)
6 * Copyright 2000 Roland Borde
7 * Copyright 2000 Paolo Scaffardi
8 * Copyright 2000-2002 Wolfgang Denk, [email protected]
9 */
10
11#if 0
12#define DEBUG 1 /* general debug */
13#define DEBUG_BOOTP_EXT 1 /* Debug received vendor fields */
14#endif
15
16#ifdef DEBUG_BOOTP_EXT
17#define debug_ext(fmt,args...) printf (fmt ,##args)
18#else
19#define debug_ext(fmt,args...)
20#endif
21
22#include <common.h>
23#include <command.h>
24#include <net.h>
25#include "bootp.h"
26#include "tftp.h"
27#include "arp.h"
28#ifdef CONFIG_STATUS_LED
29#include <status_led.h>
30#endif
31
32#define BOOTP_VENDOR_MAGIC 0x63825363 /* RFC1048 Magic Cookie */
33
34#if (CONFIG_COMMANDS & CFG_CMD_NET)
35
36#define TIMEOUT 5 /* Seconds before trying BOOTP again */
37#ifndef CONFIG_NET_RETRY_COUNT
38# define TIMEOUT_COUNT 5 /* # of timeouts before giving up */
39#else
40# define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT)
41#endif
42
43#define PORT_BOOTPS 67 /* BOOTP server UDP port */
44#define PORT_BOOTPC 68 /* BOOTP client UDP port */
45
46#ifndef CONFIG_DHCP_MIN_EXT_LEN /* minimal length of extension list */
47#define CONFIG_DHCP_MIN_EXT_LEN 64
48#endif
49
50ulong BootpID;
51int BootpTry;
52#ifdef CONFIG_BOOTP_RANDOM_DELAY
53ulong seed1, seed2;
54#endif
55
56#if (CONFIG_COMMANDS & CFG_CMD_DHCP)
57dhcp_state_t dhcp_state = INIT;
58unsigned int dhcp_leasetime = 0;
59static void DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len);
60
61/* For Debug */
62char *dhcpmsg2str(int type)
63{
64 switch (type) {
65 case 1: return "DHCPDISCOVER"; break;
66 case 2: return "DHCPOFFER"; break;
67 case 3: return "DHCPREQUEST"; break;
68 case 4: return "DHCPDECLINE"; break;
69 case 5: return "DHCPACK"; break;
70 case 6: return "DHCPNACK"; break;
71 case 7: return "DHCPRELEASE"; break;
72 default: return "UNKNOWN/INVALID MSG TYPE"; break;
73 }
74}
75
76#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX)
77extern u8 *dhcp_vendorex_prep (u8 *e); /*rtn new e after add own opts. */
78extern u8 *dhcp_vendorex_proc (u8 *e); /*rtn next e if mine,else NULL */
79#endif
80
81#endif /* CFG_CMD_DHCP */
82
83static int BootpCheckPkt(uchar *pkt, unsigned dest, unsigned src, unsigned len)
84{
85 Bootp_t *bp = (Bootp_t *) pkt;
86 int retval = 0;
87
88 if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
89 retval = -1;
90 else if (len < sizeof (Bootp_t) - OPT_SIZE)
91 retval = -2;
92 else if (bp->bp_op != OP_BOOTREQUEST &&
93 bp->bp_op != OP_BOOTREPLY &&
94 bp->bp_op != DHCP_OFFER &&
95 bp->bp_op != DHCP_ACK &&
96 bp->bp_op != DHCP_NAK ) {
97 retval = -3;
98 }
99 else if (bp->bp_htype != HWT_ETHER)
100 retval = -4;
101 else if (bp->bp_hlen != HWL_ETHER)
102 retval = -5;
103 else if (NetReadLong((ulong*)&bp->bp_id) != BootpID) {
104 retval = -6;
105 }
106
107 debug ("Filtering pkt = %d\n", retval);
108
109 return retval;
110}
111
112/*
113 * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet
114 */
115void BootpCopyNetParams(Bootp_t *bp)
116{
117 NetCopyIP(&NetOurIP, &bp->bp_yiaddr);
118 NetCopyIP(&NetServerIP, &bp->bp_siaddr);
119 memcpy (NetServerEther, ((Ethernet_t *)NetRxPkt)->et_src, 6);
120 copy_filename (BootFile, bp->bp_file, sizeof(BootFile));
121
122 debug ("Bootfile: %s\n", BootFile);
123
124 /* Propagate to environment:
125 * don't delete exising entry when BOOTP / DHCP reply does
126 * not contain a new value
127 */
128 if (*BootFile) {
129 setenv ("bootfile", BootFile);
130 }
131}
132
133static int truncate_sz (const char *name, int maxlen, int curlen)
134{
135 if (curlen >= maxlen) {
136 printf("*** WARNING: %s is too long (%d - max: %d) - truncated\n",
137 name, curlen, maxlen);
138 curlen = maxlen - 1;
139 }
140 return (curlen);
141}
142
143#if !(CONFIG_COMMANDS & CFG_CMD_DHCP)
144
145static void BootpVendorFieldProcess(u8 *ext)
146{
147 int size = *(ext+1) ;
148
149 debug_ext ("[BOOTP] Processing extension %d... (%d bytes)\n", *ext, *(ext+1));
150
151 NetBootFileSize = 0;
152
153 switch (*ext) {
154 /* Fixed length fields */
155 case 1: /* Subnet mask */
156 if (NetOurSubnetMask == 0)
157 NetCopyIP(&NetOurSubnetMask, (IPaddr_t*)(ext+2));
158 break;
159 case 2: /* Time offset - Not yet supported */
160 break;
161 /* Variable length fields */
162 case 3: /* Gateways list */
163 if (NetOurGatewayIP == 0) {
164 NetCopyIP(&NetOurGatewayIP, (IPaddr_t*)(ext+2));
165 }
166 break;
167 case 4: /* Time server - Not yet supported */
168 break;
169 case 5: /* IEN-116 name server - Not yet supported */
170 break;
171 case 6:
172 if (NetOurDNSIP == 0) {
173 NetCopyIP(&NetOurDNSIP, (IPaddr_t*)(ext+2));
174 }
175 break;
176 case 7: /* Log server - Not yet supported */
177 break;
178 case 8: /* Cookie/Quote server - Not yet supported */
179 break;
180 case 9: /* LPR server - Not yet supported */
181 break;
182 case 10: /* Impress server - Not yet supported */
183 break;
184 case 11: /* RPL server - Not yet supported */
185 break;
186 case 12: /* Host name */
187 if (NetOurHostName[0] == 0) {
188 size = truncate_sz("Host Name", sizeof(NetOurHostName), size);
189 memcpy(&NetOurHostName, ext+2, size);
190 NetOurHostName[size] = 0 ;
191 }
192 break;
193 case 13: /* Boot file size */
194 if (size == 2)
195 NetBootFileSize = ntohs(*(ushort*)(ext+2));
196 else if (size == 4)
197 NetBootFileSize = ntohl(*(ulong*)(ext+2));
198 break;
199 case 14: /* Merit dump file - Not yet supported */
200 break;
201 case 15: /* Domain name - Not yet supported */
202 break;
203 case 16: /* Swap server - Not yet supported */
204 break;
205 case 17: /* Root path */
206 if (NetOurRootPath[0] == 0) {
207 size = truncate_sz("Root Path", sizeof(NetOurRootPath), size);
208 memcpy(&NetOurRootPath, ext+2, size);
209 NetOurRootPath[size] = 0 ;
210 }
211 break;
212 case 18: /* Extension path - Not yet supported */
213 /*
214 * This can be used to send the informations of the
215 * vendor area in another file that the client can
216 * access via TFTP.
217 */
218 break;
219 /* IP host layer fields */
220 case 40: /* NIS Domain name */
221 if (NetOurNISDomain[0] == 0) {
222 size = truncate_sz ("NIS Domain Name",
223 sizeof(NetOurNISDomain),
224 size);
225 memcpy(&NetOurNISDomain, ext+2, size);
226 NetOurNISDomain[size] = 0 ;
227 }
228 break;
229 /* Application layer fields */
230 case 43: /* Vendor specific info - Not yet supported */
231 /*
232 * Binary informations to exchange specific
233 * product information.
234 */
235 break;
236 /* Reserved (custom) fields (128..254) */
237 }
238}
239
240static void BootpVendorProcess(u8 *ext, int size)
241{
242 u8 *end = ext + size ;
243
244 debug_ext ("[BOOTP] Checking extension (%d bytes)...\n", size);
245
246 while ((ext < end) && (*ext != 0xff)) {
247 if (*ext == 0) {
248 ext ++ ;
249 } else {
250 u8 *opt = ext ;
251 ext += ext[1] + 2 ;
252 if (ext <= end)
253 BootpVendorFieldProcess (opt) ;
254 }
255 }
256
257#ifdef DEBUG_BOOTP_EXT
258 printf("[BOOTP] Received fields: \n");
259 if (NetOurSubnetMask) {
260 puts ("NetOurSubnetMask : ");
261 print_IPaddr (NetOurSubnetMask);
262 putc('\n');
263 }
264
265 if (NetOurGatewayIP) {
266 puts ("NetOurGatewayIP : ");
267 print_IPaddr (NetOurGatewayIP);
268 putc('\n');
269 }
270
271 if (NetBootFileSize) {
272 printf("NetBootFileSize : %d\n", NetBootFileSize);
273 }
274
275 if (NetOurHostName[0]) {
276 printf("NetOurHostName : %s\n", NetOurHostName);
277 }
278
279 if (NetOurRootPath[0]) {
280 printf("NetOurRootPath : %s\n", NetOurRootPath);
281 }
282
283 if (NetOurNISDomain[0]) {
284 printf("NetOurNISDomain : %s\n", NetOurNISDomain);
285 }
286
287 if (NetBootFileSize) {
288 printf("NetBootFileSize: %d\n", NetBootFileSize);
289 }
290#endif /* DEBUG_BOOTP_EXT */
291}
292
293/*
294 * Handle a BOOTP received packet.
295 */
296static void
297BootpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
298{
299 Bootp_t *bp;
300 char *s;
301
302 debug ("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%d)\n",
303 src, dest, len, sizeof (Bootp_t));
304
305 bp = (Bootp_t *)pkt;
306
307 if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
308 return;
309
310 /*
311 * Got a good BOOTP reply. Copy the data into our variables.
312 */
313#ifdef CONFIG_STATUS_LED
314 status_led_set (STATUS_LED_BOOT, STATUS_LED_OFF);
315#endif
316
317 BootpCopyNetParams(bp); /* Store net parameters from reply */
318
319 /* Retrieve extended information (we must parse the vendor area) */
320 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
321 BootpVendorProcess(&bp->bp_vend[4], len);
322
323 NetSetTimeout(0, (thand_f *)0);
324
325 debug ("Got good BOOTP\n");
326
327 if (((s = getenv("autoload")) != NULL) && (*s == 'n')) {
328 /*
329 * Just use BOOTP to configure system;
330 * Do not use TFTP to load the bootfile.
331 */
332 NetState = NETLOOP_SUCCESS;
333 return;
334 }
335
336 /* Send ARP request to get TFTP server ethernet address.
337 * This automagically starts TFTP, too.
338 */
339 ArpRequest();
340}
341#endif /* !CFG_CMD_DHCP */
342
343/*
344 * Timeout on BOOTP/DHCP request.
345 */
346static void
347BootpTimeout(void)
348{
349 if (BootpTry >= TIMEOUT_COUNT) {
350 puts ("\nRetry count exceeded; starting again\n");
351 NetStartAgain ();
352 } else {
353 NetSetTimeout (TIMEOUT * CFG_HZ, BootpTimeout);
354 BootpRequest ();
355 }
356}
357
358/*
359 * Initialize BOOTP extension fields in the request.
360 */
361#if (CONFIG_COMMANDS & CFG_CMD_DHCP)
362static int DhcpExtended(u8 *e, int message_type, IPaddr_t ServerID, IPaddr_t RequestedIP)
363{
364 u8 *start = e ;
365 u8 *cnt;
366#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX)
367 u8 *x;
368#endif
369
370 *e++ = 99; /* RFC1048 Magic Cookie */
371 *e++ = 130;
372 *e++ = 83;
373 *e++ = 99;
374
375 *e++ = 53; /* DHCP Message Type */
376 *e++ = 1;
377 *e++ = message_type;
378
379 *e++ = 57; /* Maximum DHCP Message Size */
380 *e++ = 2;
381 *e++ = (576-312+OPT_SIZE) >> 8;
382 *e++ = (576-312+OPT_SIZE) & 0xff;
383
384 if ( ServerID ) {
385 int tmp = ntohl(ServerID);
386
387 *e++ = 54; /* ServerID */
388 *e++ = 4;
389 *e++ = tmp >> 24;
390 *e++ = tmp >> 16;
391 *e++ = tmp >> 8;
392 *e++ = tmp & 0xff;
393 }
394
395 if ( RequestedIP ) {
396 int tmp = ntohl(RequestedIP);
397
398 *e++ = 50; /* Requested IP */
399 *e++ = 4;
400 *e++ = tmp >> 24;
401 *e++ = tmp >> 16;
402 *e++ = tmp >> 8;
403 *e++ = tmp & 0xff;
404 }
405
406#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX)
407 if ((x = dhcp_vendorex_prep (e)))
408 return x - start ;
409#endif
410
411 *e++ = 55; /* Parameter Request List */
412 cnt = e++; /* Pointer to count of requested items */
413 *cnt = 0;
414#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SUBNETMASK)
415 *e++ = 1; /* Subnet Mask */
416 *cnt += 1;
417#endif
418#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_GATEWAY)
419 *e++ = 3; /* Router Option */
420 *cnt += 1;
421#endif
422#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS)
423 *e++ = 6; /* DNS Server(s) */
424 *cnt += 1;
425#endif
426#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_HOSTNAME)
427 *e++ = 12; /* Hostname */
428 *cnt += 1;
429#endif
430#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTFILESIZE)
431 *e++ = 13; /* Boot File Size */
432 *cnt += 1;
433#endif
434#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTPATH)
435 *e++ = 17; /* Boot path */
436 *cnt += 1;
437#endif
438#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_NISDOMAIN)
439 *e++ = 40; /* NIS Domain name request */
440 *cnt += 1;
441#endif
442 *e++ = 255; /* End of the list */
443
444 /* Pad to minimal length */
445#ifdef CONFIG_DHCP_MIN_EXT_LEN
446 while ((e - start) <= CONFIG_DHCP_MIN_EXT_LEN)
447 *e++ = 0;
448#endif
449
450 return e - start ;
451}
452
453#else /* CFG_CMD_DHCP */
454/*
455 * Warning: no field size check - change CONFIG_BOOTP_MASK at your own risk!
456 */
457static int BootpExtended (u8 *e)
458{
459 u8 *start = e ;
460
461 *e++ = 99; /* RFC1048 Magic Cookie */
462 *e++ = 130;
463 *e++ = 83;
464 *e++ = 99;
465
466#if (CONFIG_COMMANDS & CFG_CMD_DHCP)
467 *e++ = 53; /* DHCP Message Type */
468 *e++ = 1;
469 *e++ = DHCP_DISCOVER;
470
471 *e++ = 57; /* Maximum DHCP Message Size */
472 *e++ = 2;
473 *e++ = (576-312+OPT_SIZE) >> 16;
474 *e++ = (576-312+OPT_SIZE) & 0xff;
475#endif /* CFG_CMD_DHCP */
476
477#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SUBNETMASK)
478 *e++ = 1; /* Subnet mask request */
479 *e++ = 4;
480 e += 4;
481#endif
482
483#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_GATEWAY)
484 *e++ = 3; /* Default gateway request */
485 *e++ = 4;
486 e += 4;
487#endif
488
489#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS)
490 *e++ = 6; /* Domain Name Server */
491 *e++ = 4;
492 e += 4;
493#endif
494
495#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_HOSTNAME)
496 *e++ = 12; /* Host name request */
497 *e++ = 32;
498 e += 32;
499#endif
500
501#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTFILESIZE)
502 *e++ = 13; /* Boot file size */
503 *e++ = 2;
504 e += 2;
505#endif
506
507#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTPATH)
508 *e++ = 17; /* Boot path */
509 *e++ = 32;
510 e += 32;
511#endif
512
513#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_NISDOMAIN)
514 *e++ = 40; /* NIS Domain name request */
515 *e++ = 32;
516 e += 32;
517#endif
518
519 *e++ = 255; /* End of the list */
520
521 return e - start ;
522}
523#endif /* CFG_CMD_DHCP */
524
525void
526BootpRequest (void)
527{
528 volatile uchar *pkt, *iphdr;
529 Bootp_t *bp;
530 int ext_len, pktlen, iplen;
531
532#if (CONFIG_COMMANDS & CFG_CMD_DHCP)
533 dhcp_state = INIT;
534#endif
535
536#ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */
537 unsigned char bi_enetaddr[6];
538 int reg;
539 char *e,*s;
540 uchar tmp[64];
541 ulong tst1, tst2, sum, m_mask, m_value = 0;
542
543 if (BootpTry ==0) {
544 /* get our mac */
545 reg = getenv_r ("ethaddr", tmp, sizeof(tmp));
546 s = (reg > 0) ? tmp : NULL;
547
548 for (reg=0; reg<6; ++reg) {
549 bi_enetaddr[reg] = s ? simple_strtoul(s, &e, 16) : 0;
550 if (s) {
551 s = (*e) ? e+1 : e;
552 }
553 }
554#ifdef DEBUG
555 printf("BootpRequest => Our Mac: ");
556 for (reg=0; reg<6; reg++) {
557 printf ("%x%c",
558 bi_enetaddr[reg],
559 reg==5 ? '\n' : ':');
560 }
561#endif /* DEBUG */
562
563 /* Mac-Manipulation 2 get seed1 */
564 tst1=0;
565 tst2=0;
566 for (reg=2; reg<6; reg++) {
567 tst1 = tst1 << 8;
568 tst1 = tst1 | bi_enetaddr[reg];
569 }
570 for (reg=0; reg<2; reg++) {
571 tst2 = tst2 | bi_enetaddr[reg];
572 tst2 = tst2 << 8;
573 }
574
575 seed1 = tst1^tst2;
576
577 /* Mirror seed1*/
578 m_mask=0x1;
579 for (reg=1;reg<=32;reg++) {
580 m_value |= (m_mask & seed1);
581 seed1 = seed1 >> 1;
582 m_value = m_value << 1;
583 }
584 seed1 = m_value;
585 seed2 = 0xB78D0945;
586 }
587
588 /* Random Number Generator */
589
590 for (reg=0;reg<=0;reg++) {
591 sum = seed1 + seed2;
592 if (sum < seed1 || sum < seed2)
593 sum++;
594 seed2 = seed1;
595 seed1 = sum;
596
597 if (BootpTry<=2) { /* Start with max 1024 * 1ms */
598 sum = sum >> (22-BootpTry);
599 } else { /*After 3rd BOOTP request max 8192 * 1ms */
600 sum = sum >> 19;
601 }
602 }
603
604 printf ("Random delay: %ld ms...\n", sum);
605 for (reg=0; reg <sum; reg++) {
606 udelay(1000); /*Wait 1ms*/
607 }
608#endif /* CONFIG_BOOTP_RANDOM_DELAY */
609
610 printf("BOOTP broadcast %d\n", ++BootpTry);
611 pkt = NetTxPacket;
612 memset ((void*)pkt, 0, PKTSIZE);
613
614 NetSetEther(pkt, NetBcastAddr, PROT_IP);
615 pkt += ETHER_HDR_SIZE;
616
617 /*
618 * Next line results in incorrect packet size being transmitted, resulting
619 * in errors in some DHCP servers, reporting missing bytes. Size must be
620 * set in packet header after extension length has been determined.
621 * C. Hallinan, DS4.COM, Inc.
622 */
623 /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */
624 iphdr = pkt; /* We need this later for NetSetIP() */
625 pkt += IP_HDR_SIZE;
626
627 bp = (Bootp_t *)pkt;
628 bp->bp_op = OP_BOOTREQUEST;
629 bp->bp_htype = HWT_ETHER;
630 bp->bp_hlen = HWL_ETHER;
631 bp->bp_hops = 0;
632 bp->bp_secs = htons(get_timer(0) / CFG_HZ);
633 NetWriteIP(&bp->bp_ciaddr, 0);
634 NetWriteIP(&bp->bp_yiaddr, 0);
635 NetWriteIP(&bp->bp_siaddr, 0);
636 NetWriteIP(&bp->bp_giaddr, 0);
637 memcpy (bp->bp_chaddr, NetOurEther, 6);
638 copy_filename (bp->bp_file, BootFile, sizeof(bp->bp_file));
639
640 /* Request additional information from the BOOTP/DHCP server */
641#if (CONFIG_COMMANDS & CFG_CMD_DHCP)
642 ext_len = DhcpExtended(bp->bp_vend, DHCP_DISCOVER, 0, 0);
643#else
644 ext_len = BootpExtended(bp->bp_vend);
645#endif /* CFG_CMD_DHCP */
646
647 /*
648 * Bootp ID is the lower 4 bytes of our ethernet address
649 * plus the current time in HZ.
650 */
651 BootpID = ((ulong)NetOurEther[2] << 24)
652 | ((ulong)NetOurEther[3] << 16)
653 | ((ulong)NetOurEther[4] << 8)
654 | (ulong)NetOurEther[5];
655 BootpID += get_timer(0);
656 BootpID = htonl(BootpID);
657 NetCopyLong(&bp->bp_id, &BootpID);
658
659 /*
660 * Calculate proper packet lengths taking into account the
661 * variable size of the options field
662 */
663 pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + ext_len;
664 iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len;
665 NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
666 NetSetTimeout(SELECT_TIMEOUT * CFG_HZ, BootpTimeout);
667
668#if (CONFIG_COMMANDS & CFG_CMD_DHCP)
669 dhcp_state = SELECTING;
670 NetSetHandler(DhcpHandler);
671#else
672 NetSetHandler(BootpHandler);
673#endif /* CFG_CMD_DHCP */
674 NetSendPacket(NetTxPacket, pktlen);
675}
676
677#if (CONFIG_COMMANDS & CFG_CMD_DHCP)
678void DhcpOptionsProcess(char *popt)
679{
680 char *end = popt + BOOTP_HDR_SIZE;
681 int oplen, size;
682
683 while ( popt < end && *popt != 0xff ) {
684 oplen = *(popt + 1);
685 switch(*popt) {
686 case 1:
687 NetCopyIP(&NetOurSubnetMask, (popt+2));
688 break;
689 case 3:
690 NetCopyIP(&NetOurGatewayIP, (popt+2));
691 break;
692 case 6:
693 NetCopyIP(&NetOurDNSIP, (popt+2));
694 break;
695 case 12:
696 size = truncate_sz ("Host Name",
697 sizeof(NetOurHostName),
698 oplen);
699 memcpy(&NetOurHostName, popt+2, size);
700 NetOurHostName[size] = 0 ;
701 break;
702 case 15: /* Ignore Domain Name Option */
703 break;
704 case 17:
705 size = truncate_sz ("Root Path",
706 sizeof(NetOurRootPath),
707 oplen);
708 memcpy(&NetOurRootPath, popt+2, size);
709 NetOurRootPath[size] = 0 ;
710 break;
711 case 51:
712 dhcp_leasetime = *(unsigned int *)(popt + 2);
713 break;
714 case 53: /* Ignore Message Type Option */
715 break;
716 case 54:
717 NetCopyIP(&NetServerIP, (popt+2));
718 break;
719 case 58: /* Ignore Renewal Time Option */
720 break;
721 case 59: /* Ignore Rebinding Time Option */
722 break;
723 default:
724#if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX)
725 if (dhcp_vendorex_proc(popt))
726 break;
727#endif
728 printf("*** Unhandled DHCP Option in OFFER/ACK: %d\n",
729 *popt);
730 break;
731 }
732 popt += oplen + 2; /* Process next option */
733 }
734}
735
736static int DhcpMessageType(unsigned char *popt)
737{
738 if (NetReadLong((ulong*)popt) != htonl(BOOTP_VENDOR_MAGIC))
739 return -1;
740
741 popt += 4;
742 while ( *popt != 0xff ) {
743 if ( *popt == 53 ) /* DHCP Message Type */
744 return *(popt + 2);
745 popt += *(popt + 1) + 2; /* Scan through all options */
746 }
747 return -1;
748}
749
750void DhcpSendRequestPkt(Bootp_t *bp_offer)
751{
752 volatile uchar *pkt, *iphdr;
753 Bootp_t *bp;
754 int pktlen, iplen, extlen;
755
756 debug ("DhcpSendRequestPkt: Sending DHCPREQUEST\n");
757 pkt = NetTxPacket;
758 memset ((void*)pkt, 0, PKTSIZE);
759
760 NetSetEther(pkt, NetBcastAddr, PROT_IP);
761 pkt += ETHER_HDR_SIZE;
762
763 iphdr = pkt; /* We'll need this later to set proper pkt size */
764 pkt += IP_HDR_SIZE;
765
766 bp = (Bootp_t *)pkt;
767 bp->bp_op = OP_BOOTREQUEST;
768 bp->bp_htype = HWT_ETHER;
769 bp->bp_hlen = HWL_ETHER;
770 bp->bp_hops = 0;
771 bp->bp_secs = htons(get_timer(0) / CFG_HZ);
772 NetCopyIP(&bp->bp_ciaddr, &bp_offer->bp_ciaddr); /* both in network byte order */
773 NetCopyIP(&bp->bp_yiaddr, &bp_offer->bp_yiaddr);
774 NetCopyIP(&bp->bp_siaddr, &bp_offer->bp_siaddr);
775 NetCopyIP(&bp->bp_giaddr, &bp_offer->bp_giaddr);
776 memcpy (bp->bp_chaddr, NetOurEther, 6);
777
778 /*
779 * ID is the id of the OFFER packet
780 */
781
782 NetCopyLong(&bp->bp_id, &bp_offer->bp_id);
783
784 /*
785 * Copy options from OFFER packet if present
786 */
787 extlen = DhcpExtended(bp->bp_vend, DHCP_REQUEST, NetServerIP, bp->bp_yiaddr);
788
789 pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + extlen;
790 iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen;
791 NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
792
793 debug ("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
794 NetSendPacket(NetTxPacket, pktlen);
795}
796
797/*
798 * Handle DHCP received packets.
799 */
800static void
801DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
802{
803 Bootp_t *bp = (Bootp_t *)pkt;
804
805 debug ("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
806 src, dest, len, dhcp_state);
807
808 if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
809 return;
810
811 debug ("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n",
812 src, dest, len, dhcp_state);
813
814 switch (dhcp_state) {
815 case SELECTING:
816 /*
817 * Wait an appropriate time for any potential DHCPOFFER packets
818 * to arrive. Then select one, and generate DHCPREQUEST response.
819 * If filename is in format we recognize, assume it is a valid
820 * OFFER from a server we want.
821 */
822 debug ("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
823#ifdef CFG_BOOTFILE_PREFIX
824 if (strncmp(bp->bp_file,
825 CFG_BOOTFILE_PREFIX,
826 strlen(CFG_BOOTFILE_PREFIX)) == 0 ) {
827#endif /* CFG_BOOTFILE_PREFIX */
828
829 debug ("TRANSITIONING TO REQUESTING STATE\n");
830 dhcp_state = REQUESTING;
831#if 0
832 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
833 DhcpOptionsProcess(&bp->bp_vend[4]);
834
835#endif
836 BootpCopyNetParams(bp); /* Store net params from reply */
837
838 NetSetTimeout(TIMEOUT * CFG_HZ, BootpTimeout);
839 DhcpSendRequestPkt(bp);
840#ifdef CFG_BOOTFILE_PREFIX
841 }
842#endif /* CFG_BOOTFILE_PREFIX */
843
844 return;
845 break;
846 case REQUESTING:
847 debug ("DHCP State: REQUESTING\n");
848
849 if ( DhcpMessageType(bp->bp_vend) == DHCP_ACK ) {
850 char *s;
851
852 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
853 DhcpOptionsProcess(&bp->bp_vend[4]);
854 BootpCopyNetParams(bp); /* Store net params from reply */
855 dhcp_state = BOUND;
856 printf("DHCP client bound to address ");
857 print_IPaddr(NetOurIP);
858 printf("\n");
859
860 /* Obey the 'autoload' setting */
861 if (((s = getenv("autoload")) != NULL) && (*s == 'n')) {
862 NetState = NETLOOP_SUCCESS;
863 return;
864 }
865 /* Send ARP request to get TFTP server ethernet address.
866 * This automagically starts TFTP, too.
867 */
868 ArpRequest();
869 return;
870 }
871 break;
872 default:
873 printf("DHCP: INVALID STATE\n");
874 break;
875 }
876
877}
878
879void DhcpRequest(void)
880{
881 BootpRequest();
882}
883#endif /* CFG_CMD_DHCP */
884
885#endif /* CFG_CMD_NET */
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