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arm: add support for CONFIG_GENERIC_MMC
[u-boot] / net / bootp.c
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 2000-2004 Wolfgang Denk, wd@denx.de
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 "nfs.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 defined(CONFIG_CMD_NET)
35
36 #define TIMEOUT         5000UL  /* Milliseconds 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
50 ulong           BootpID;
51 int             BootpTry;
52 #ifdef CONFIG_BOOTP_RANDOM_DELAY
53 ulong           seed1, seed2;
54 #endif
55
56 #if defined(CONFIG_CMD_DHCP)
57 dhcp_state_t dhcp_state = INIT;
58 unsigned long dhcp_leasetime = 0;
59 IPaddr_t NetDHCPServerIP = 0;
60 static void DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len);
61
62 /* For Debug */
63 #if 0
64 static char *dhcpmsg2str(int type)
65 {
66         switch (type) {
67         case 1:  return "DHCPDISCOVER"; break;
68         case 2:  return "DHCPOFFER";    break;
69         case 3:  return "DHCPREQUEST";  break;
70         case 4:  return "DHCPDECLINE";  break;
71         case 5:  return "DHCPACK";      break;
72         case 6:  return "DHCPNACK";     break;
73         case 7:  return "DHCPRELEASE";  break;
74         default: return "UNKNOWN/INVALID MSG TYPE"; break;
75         }
76 }
77 #endif
78
79 #if defined(CONFIG_BOOTP_VENDOREX)
80 extern u8 *dhcp_vendorex_prep (u8 *e); /*rtn new e after add own opts. */
81 extern u8 *dhcp_vendorex_proc (u8 *e); /*rtn next e if mine,else NULL  */
82 #endif
83
84 #endif
85
86 static int BootpCheckPkt(uchar *pkt, unsigned dest, unsigned src, unsigned len)
87 {
88         Bootp_t *bp = (Bootp_t *) pkt;
89         int retval = 0;
90
91         if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
92                 retval = -1;
93         else if (len < sizeof (Bootp_t) - OPT_SIZE)
94                 retval = -2;
95         else if (bp->bp_op != OP_BOOTREQUEST &&
96             bp->bp_op != OP_BOOTREPLY &&
97             bp->bp_op != DHCP_OFFER &&
98             bp->bp_op != DHCP_ACK &&
99             bp->bp_op != DHCP_NAK ) {
100                 retval = -3;
101         }
102         else if (bp->bp_htype != HWT_ETHER)
103                 retval = -4;
104         else if (bp->bp_hlen != HWL_ETHER)
105                 retval = -5;
106         else if (NetReadLong((ulong*)&bp->bp_id) != BootpID) {
107                 retval = -6;
108         }
109
110         debug ("Filtering pkt = %d\n", retval);
111
112         return retval;
113 }
114
115 /*
116  * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet
117  */
118 static void BootpCopyNetParams(Bootp_t *bp)
119 {
120         IPaddr_t tmp_ip;
121
122         NetCopyIP(&NetOurIP, &bp->bp_yiaddr);
123 #if !defined(CONFIG_BOOTP_SERVERIP)
124         NetCopyIP(&tmp_ip, &bp->bp_siaddr);
125         if (tmp_ip != 0)
126                 NetCopyIP(&NetServerIP, &bp->bp_siaddr);
127         memcpy (NetServerEther, ((Ethernet_t *)NetRxPkt)->et_src, 6);
128 #endif
129         if (strlen(bp->bp_file) > 0)
130                 copy_filename (BootFile, bp->bp_file, sizeof(BootFile));
131
132         debug ("Bootfile: %s\n", BootFile);
133
134         /* Propagate to environment:
135          * don't delete exising entry when BOOTP / DHCP reply does
136          * not contain a new value
137          */
138         if (*BootFile) {
139                 setenv ("bootfile", BootFile);
140         }
141 }
142
143 static int truncate_sz (const char *name, int maxlen, int curlen)
144 {
145         if (curlen >= maxlen) {
146                 printf("*** WARNING: %s is too long (%d - max: %d) - truncated\n",
147                         name, curlen, maxlen);
148                 curlen = maxlen - 1;
149         }
150         return (curlen);
151 }
152
153 #if !defined(CONFIG_CMD_DHCP)
154
155 static void BootpVendorFieldProcess (u8 * ext)
156 {
157         int size = *(ext + 1);
158
159         debug_ext ("[BOOTP] Processing extension %d... (%d bytes)\n", *ext,
160                    *(ext + 1));
161
162         NetBootFileSize = 0;
163
164         switch (*ext) {
165                 /* Fixed length fields */
166         case 1:                 /* Subnet mask                                  */
167                 if (NetOurSubnetMask == 0)
168                         NetCopyIP (&NetOurSubnetMask, (IPaddr_t *) (ext + 2));
169                 break;
170         case 2:                 /* Time offset - Not yet supported              */
171                 break;
172                 /* Variable length fields */
173         case 3:                 /* Gateways list                                */
174                 if (NetOurGatewayIP == 0) {
175                         NetCopyIP (&NetOurGatewayIP, (IPaddr_t *) (ext + 2));
176                 }
177                 break;
178         case 4:                 /* Time server - Not yet supported              */
179                 break;
180         case 5:                 /* IEN-116 name server - Not yet supported      */
181                 break;
182         case 6:
183                 if (NetOurDNSIP == 0) {
184                         NetCopyIP (&NetOurDNSIP, (IPaddr_t *) (ext + 2));
185                 }
186 #if defined(CONFIG_BOOTP_DNS2)
187                 if ((NetOurDNS2IP == 0) && (size > 4)) {
188                         NetCopyIP (&NetOurDNS2IP, (IPaddr_t *) (ext + 2 + 4));
189                 }
190 #endif
191                 break;
192         case 7:                 /* Log server - Not yet supported               */
193                 break;
194         case 8:                 /* Cookie/Quote server - Not yet supported      */
195                 break;
196         case 9:                 /* LPR server - Not yet supported               */
197                 break;
198         case 10:                /* Impress server - Not yet supported           */
199                 break;
200         case 11:                /* RPL server - Not yet supported               */
201                 break;
202         case 12:                /* Host name                                    */
203                 if (NetOurHostName[0] == 0) {
204                         size = truncate_sz ("Host Name", sizeof (NetOurHostName), size);
205                         memcpy (&NetOurHostName, ext + 2, size);
206                         NetOurHostName[size] = 0;
207                 }
208                 break;
209         case 13:                /* Boot file size                               */
210                 if (size == 2)
211                         NetBootFileSize = ntohs (*(ushort *) (ext + 2));
212                 else if (size == 4)
213                         NetBootFileSize = ntohl (*(ulong *) (ext + 2));
214                 break;
215         case 14:                /* Merit dump file - Not yet supported          */
216                 break;
217         case 15:                /* Domain name - Not yet supported              */
218                 break;
219         case 16:                /* Swap server - Not yet supported              */
220                 break;
221         case 17:                /* Root path                                    */
222                 if (NetOurRootPath[0] == 0) {
223                         size = truncate_sz ("Root Path", sizeof (NetOurRootPath), size);
224                         memcpy (&NetOurRootPath, ext + 2, size);
225                         NetOurRootPath[size] = 0;
226                 }
227                 break;
228         case 18:                /* Extension path - Not yet supported           */
229                 /*
230                  * This can be used to send the information of the
231                  * vendor area in another file that the client can
232                  * access via TFTP.
233                  */
234                 break;
235                 /* IP host layer fields */
236         case 40:                /* NIS Domain name                              */
237                 if (NetOurNISDomain[0] == 0) {
238                         size = truncate_sz ("NIS Domain Name", sizeof (NetOurNISDomain), size);
239                         memcpy (&NetOurNISDomain, ext + 2, size);
240                         NetOurNISDomain[size] = 0;
241                 }
242                 break;
243                 /* Application layer fields */
244         case 43:                /* Vendor specific info - Not yet supported     */
245                 /*
246                  * Binary information to exchange specific
247                  * product information.
248                  */
249                 break;
250                 /* Reserved (custom) fields (128..254) */
251         }
252 }
253
254 static void BootpVendorProcess (u8 * ext, int size)
255 {
256         u8 *end = ext + size;
257
258         debug_ext ("[BOOTP] Checking extension (%d bytes)...\n", size);
259
260         while ((ext < end) && (*ext != 0xff)) {
261                 if (*ext == 0) {
262                         ext++;
263                 } else {
264                         u8 *opt = ext;
265
266                         ext += ext[1] + 2;
267                         if (ext <= end)
268                                 BootpVendorFieldProcess (opt);
269                 }
270         }
271
272 #ifdef DEBUG_BOOTP_EXT
273         puts ("[BOOTP] Received fields: \n");
274         if (NetOurSubnetMask)
275                 printf ("NetOurSubnetMask : %pI4\n", &NetOurSubnetMask);
276
277         if (NetOurGatewayIP)
278                 printf ("NetOurGatewayIP        : %pI4", &NetOurGatewayIP);
279
280         if (NetBootFileSize) {
281                 printf ("NetBootFileSize : %d\n", NetBootFileSize);
282         }
283
284         if (NetOurHostName[0]) {
285                 printf ("NetOurHostName  : %s\n", NetOurHostName);
286         }
287
288         if (NetOurRootPath[0]) {
289                 printf ("NetOurRootPath  : %s\n", NetOurRootPath);
290         }
291
292         if (NetOurNISDomain[0]) {
293                 printf ("NetOurNISDomain : %s\n", NetOurNISDomain);
294         }
295
296         if (NetBootFileSize) {
297                 printf ("NetBootFileSize: %d\n", NetBootFileSize);
298         }
299 #endif /* DEBUG_BOOTP_EXT */
300 }
301 /*
302  *      Handle a BOOTP received packet.
303  */
304 static void
305 BootpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
306 {
307         Bootp_t *bp;
308         char    *s;
309
310         debug ("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n",
311                 src, dest, len, sizeof (Bootp_t));
312
313         bp = (Bootp_t *)pkt;
314
315         if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
316                 return;
317
318         /*
319          *      Got a good BOOTP reply.  Copy the data into our variables.
320          */
321 #ifdef CONFIG_STATUS_LED
322         status_led_set (STATUS_LED_BOOT, STATUS_LED_OFF);
323 #endif
324
325         BootpCopyNetParams(bp);         /* Store net parameters from reply */
326
327         /* Retrieve extended information (we must parse the vendor area) */
328         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
329                 BootpVendorProcess((uchar *)&bp->bp_vend[4], len);
330
331         NetSetTimeout(0, (thand_f *)0);
332
333         debug ("Got good BOOTP\n");
334
335         if ((s = getenv("autoload")) != NULL) {
336                 if (*s == 'n') {
337                         /*
338                          * Just use BOOTP to configure system;
339                          * Do not use TFTP to load the bootfile.
340                          */
341                         NetState = NETLOOP_SUCCESS;
342                         return;
343 #if defined(CONFIG_CMD_NFS)
344                 } else if (strcmp(s, "NFS") == 0) {
345                         /*
346                          * Use NFS to load the bootfile.
347                          */
348                         NfsStart();
349                         return;
350 #endif
351                 }
352         }
353
354         TftpStart();
355 }
356 #endif
357
358 /*
359  *      Timeout on BOOTP/DHCP request.
360  */
361 static void
362 BootpTimeout(void)
363 {
364         if (BootpTry >= TIMEOUT_COUNT) {
365                 puts ("\nRetry count exceeded; starting again\n");
366                 NetStartAgain ();
367         } else {
368                 NetSetTimeout (TIMEOUT, BootpTimeout);
369                 BootpRequest ();
370         }
371 }
372
373 /*
374  *      Initialize BOOTP extension fields in the request.
375  */
376 #if defined(CONFIG_CMD_DHCP)
377 static int DhcpExtended (u8 * e, int message_type, IPaddr_t ServerID, IPaddr_t RequestedIP)
378 {
379         u8 *start = e;
380         u8 *cnt;
381
382 #if defined(CONFIG_BOOTP_VENDOREX)
383         u8 *x;
384 #endif
385 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
386         char *hostname;
387 #endif
388
389         *e++ = 99;              /* RFC1048 Magic Cookie */
390         *e++ = 130;
391         *e++ = 83;
392         *e++ = 99;
393
394         *e++ = 53;              /* DHCP Message Type */
395         *e++ = 1;
396         *e++ = message_type;
397
398         *e++ = 57;              /* Maximum DHCP Message Size */
399         *e++ = 2;
400         *e++ = (576 - 312 + OPT_SIZE) >> 8;
401         *e++ = (576 - 312 + OPT_SIZE) & 0xff;
402
403         if (ServerID) {
404                 int tmp = ntohl (ServerID);
405
406                 *e++ = 54;      /* ServerID */
407                 *e++ = 4;
408                 *e++ = tmp >> 24;
409                 *e++ = tmp >> 16;
410                 *e++ = tmp >> 8;
411                 *e++ = tmp & 0xff;
412         }
413
414         if (RequestedIP) {
415                 int tmp = ntohl (RequestedIP);
416
417                 *e++ = 50;      /* Requested IP */
418                 *e++ = 4;
419                 *e++ = tmp >> 24;
420                 *e++ = tmp >> 16;
421                 *e++ = tmp >> 8;
422                 *e++ = tmp & 0xff;
423         }
424 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
425         if ((hostname = getenv ("hostname"))) {
426                 int hostnamelen = strlen (hostname);
427
428                 *e++ = 12;      /* Hostname */
429                 *e++ = hostnamelen;
430                 memcpy (e, hostname, hostnamelen);
431                 e += hostnamelen;
432         }
433 #endif
434
435 #if defined(CONFIG_BOOTP_VENDOREX)
436         if ((x = dhcp_vendorex_prep (e)))
437                 return x - start;
438 #endif
439
440         *e++ = 55;              /* Parameter Request List */
441          cnt = e++;             /* Pointer to count of requested items */
442         *cnt = 0;
443 #if defined(CONFIG_BOOTP_SUBNETMASK)
444         *e++  = 1;              /* Subnet Mask */
445         *cnt += 1;
446 #endif
447 #if defined(CONFIG_BOOTP_TIMEOFFSET)
448         *e++  = 2;
449         *cnt += 1;
450 #endif
451 #if defined(CONFIG_BOOTP_GATEWAY)
452         *e++  = 3;              /* Router Option */
453         *cnt += 1;
454 #endif
455 #if defined(CONFIG_BOOTP_DNS)
456         *e++  = 6;              /* DNS Server(s) */
457         *cnt += 1;
458 #endif
459 #if defined(CONFIG_BOOTP_HOSTNAME)
460         *e++  = 12;             /* Hostname */
461         *cnt += 1;
462 #endif
463 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
464         *e++  = 13;             /* Boot File Size */
465         *cnt += 1;
466 #endif
467 #if defined(CONFIG_BOOTP_BOOTPATH)
468         *e++  = 17;             /* Boot path */
469         *cnt += 1;
470 #endif
471 #if defined(CONFIG_BOOTP_NISDOMAIN)
472         *e++  = 40;             /* NIS Domain name request */
473         *cnt += 1;
474 #endif
475 #if defined(CONFIG_BOOTP_NTPSERVER)
476         *e++  = 42;
477         *cnt += 1;
478 #endif
479         *e++  = 255;            /* End of the list */
480
481         /* Pad to minimal length */
482 #ifdef  CONFIG_DHCP_MIN_EXT_LEN
483         while ((e - start) <= CONFIG_DHCP_MIN_EXT_LEN)
484                 *e++ = 0;
485 #endif
486
487         return e - start;
488 }
489
490 #else
491 /*
492  *      Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
493  */
494 static int BootpExtended (u8 * e)
495 {
496         u8 *start = e;
497
498         *e++ = 99;              /* RFC1048 Magic Cookie */
499         *e++ = 130;
500         *e++ = 83;
501         *e++ = 99;
502
503 #if defined(CONFIG_CMD_DHCP)
504         *e++ = 53;              /* DHCP Message Type */
505         *e++ = 1;
506         *e++ = DHCP_DISCOVER;
507
508         *e++ = 57;              /* Maximum DHCP Message Size */
509         *e++ = 2;
510         *e++ = (576 - 312 + OPT_SIZE) >> 16;
511         *e++ = (576 - 312 + OPT_SIZE) & 0xff;
512 #endif
513
514 #if defined(CONFIG_BOOTP_SUBNETMASK)
515         *e++ = 1;               /* Subnet mask request */
516         *e++ = 4;
517         e   += 4;
518 #endif
519
520 #if defined(CONFIG_BOOTP_GATEWAY)
521         *e++ = 3;               /* Default gateway request */
522         *e++ = 4;
523         e   += 4;
524 #endif
525
526 #if defined(CONFIG_BOOTP_DNS)
527         *e++ = 6;               /* Domain Name Server */
528         *e++ = 4;
529         e   += 4;
530 #endif
531
532 #if defined(CONFIG_BOOTP_HOSTNAME)
533         *e++ = 12;              /* Host name request */
534         *e++ = 32;
535         e   += 32;
536 #endif
537
538 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
539         *e++ = 13;              /* Boot file size */
540         *e++ = 2;
541         e   += 2;
542 #endif
543
544 #if defined(CONFIG_BOOTP_BOOTPATH)
545         *e++ = 17;              /* Boot path */
546         *e++ = 32;
547         e   += 32;
548 #endif
549
550 #if defined(CONFIG_BOOTP_NISDOMAIN)
551         *e++ = 40;              /* NIS Domain name request */
552         *e++ = 32;
553         e   += 32;
554 #endif
555
556         *e++ = 255;             /* End of the list */
557
558         return e - start;
559 }
560 #endif
561
562 void
563 BootpRequest (void)
564 {
565         volatile uchar *pkt, *iphdr;
566         Bootp_t *bp;
567         int ext_len, pktlen, iplen;
568
569 #if defined(CONFIG_CMD_DHCP)
570         dhcp_state = INIT;
571 #endif
572
573 #ifdef CONFIG_BOOTP_RANDOM_DELAY                /* Random BOOTP delay */
574         unsigned char bi_enetaddr[6];
575         int   reg;
576         ulong tst1, tst2, sum, m_mask, m_value = 0;
577
578         if (BootpTry ==0) {
579                 /* get our mac */
580                 eth_getenv_enetaddr("ethaddr", bi_enetaddr);
581
582 #ifdef DEBUG
583                 puts ("BootpRequest => Our Mac: ");
584                 for (reg=0; reg<6; reg++) {
585                         printf ("%x%c",
586                                 bi_enetaddr[reg],
587                                 reg==5 ? '\n' : ':');
588                 }
589 #endif /* DEBUG */
590
591                 /* Mac-Manipulation 2 get seed1 */
592                 tst1=0;
593                 tst2=0;
594                 for (reg=2; reg<6; reg++) {
595                         tst1 = tst1 << 8;
596                         tst1 = tst1 | bi_enetaddr[reg];
597                 }
598                 for (reg=0; reg<2; reg++) {
599                         tst2 = tst2 | bi_enetaddr[reg];
600                         tst2 = tst2 << 8;
601                 }
602
603                 seed1 = tst1^tst2;
604
605                 /* Mirror seed1*/
606                 m_mask=0x1;
607                 for (reg=1;reg<=32;reg++) {
608                         m_value |= (m_mask & seed1);
609                         seed1 = seed1 >> 1;
610                         m_value = m_value << 1;
611                 }
612                 seed1 = m_value;
613                 seed2 = 0xB78D0945;
614         }
615
616         /* Random Number Generator */
617
618         for (reg=0;reg<=0;reg++) {
619                 sum = seed1 + seed2;
620                 if (sum < seed1 || sum < seed2)
621                         sum++;
622                 seed2 = seed1;
623                 seed1 = sum;
624
625                 if (BootpTry<=2) {      /* Start with max 1024 * 1ms */
626                         sum = sum >> (22-BootpTry);
627                 } else {                /*After 3rd BOOTP request max 8192 * 1ms */
628                         sum = sum >> 19;
629                 }
630         }
631
632         printf ("Random delay: %ld ms...\n", sum);
633         for (reg=0; reg <sum; reg++) {
634                 udelay(1000); /*Wait 1ms*/
635         }
636 #endif  /* CONFIG_BOOTP_RANDOM_DELAY */
637
638         printf("BOOTP broadcast %d\n", ++BootpTry);
639         pkt = NetTxPacket;
640         memset ((void*)pkt, 0, PKTSIZE);
641
642         pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP);
643
644         /*
645          * Next line results in incorrect packet size being transmitted, resulting
646          * in errors in some DHCP servers, reporting missing bytes.  Size must be
647          * set in packet header after extension length has been determined.
648          * C. Hallinan, DS4.COM, Inc.
649          */
650         /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */
651         iphdr = pkt;    /* We need this later for NetSetIP() */
652         pkt += IP_HDR_SIZE;
653
654         bp = (Bootp_t *)pkt;
655         bp->bp_op = OP_BOOTREQUEST;
656         bp->bp_htype = HWT_ETHER;
657         bp->bp_hlen = HWL_ETHER;
658         bp->bp_hops = 0;
659         bp->bp_secs = htons(get_timer(0) / 1000);
660         NetWriteIP(&bp->bp_ciaddr, 0);
661         NetWriteIP(&bp->bp_yiaddr, 0);
662         NetWriteIP(&bp->bp_siaddr, 0);
663         NetWriteIP(&bp->bp_giaddr, 0);
664         memcpy (bp->bp_chaddr, NetOurEther, 6);
665         copy_filename (bp->bp_file, BootFile, sizeof(bp->bp_file));
666
667         /* Request additional information from the BOOTP/DHCP server */
668 #if defined(CONFIG_CMD_DHCP)
669         ext_len = DhcpExtended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0);
670 #else
671         ext_len = BootpExtended((u8 *)bp->bp_vend);
672 #endif
673
674         /*
675          *      Bootp ID is the lower 4 bytes of our ethernet address
676          *      plus the current time in ms.
677          */
678         BootpID = ((ulong)NetOurEther[2] << 24)
679                 | ((ulong)NetOurEther[3] << 16)
680                 | ((ulong)NetOurEther[4] << 8)
681                 | (ulong)NetOurEther[5];
682         BootpID += get_timer(0);
683         BootpID  = htonl(BootpID);
684         NetCopyLong(&bp->bp_id, &BootpID);
685
686         /*
687          * Calculate proper packet lengths taking into account the
688          * variable size of the options field
689          */
690         pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len;
691         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len;
692         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
693         NetSetTimeout(SELECT_TIMEOUT, BootpTimeout);
694
695 #if defined(CONFIG_CMD_DHCP)
696         dhcp_state = SELECTING;
697         NetSetHandler(DhcpHandler);
698 #else
699         NetSetHandler(BootpHandler);
700 #endif
701         NetSendPacket(NetTxPacket, pktlen);
702 }
703
704 #if defined(CONFIG_CMD_DHCP)
705 static void DhcpOptionsProcess (uchar * popt, Bootp_t *bp)
706 {
707         uchar *end = popt + BOOTP_HDR_SIZE;
708         int oplen, size;
709
710         while (popt < end && *popt != 0xff) {
711                 oplen = *(popt + 1);
712                 switch (*popt) {
713                 case 1:
714                         NetCopyIP (&NetOurSubnetMask, (popt + 2));
715                         break;
716 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
717                 case 2:         /* Time offset  */
718                         NetCopyLong ((ulong *)&NetTimeOffset, (ulong *) (popt + 2));
719                         NetTimeOffset = ntohl (NetTimeOffset);
720                         break;
721 #endif
722                 case 3:
723                         NetCopyIP (&NetOurGatewayIP, (popt + 2));
724                         break;
725                 case 6:
726                         NetCopyIP (&NetOurDNSIP, (popt + 2));
727 #if defined(CONFIG_BOOTP_DNS2)
728                         if (*(popt + 1) > 4) {
729                                 NetCopyIP (&NetOurDNS2IP, (popt + 2 + 4));
730                         }
731 #endif
732                         break;
733                 case 12:
734                         size = truncate_sz ("Host Name", sizeof (NetOurHostName), oplen);
735                         memcpy (&NetOurHostName, popt + 2, size);
736                         NetOurHostName[size] = 0;
737                         break;
738                 case 15:        /* Ignore Domain Name Option */
739                         break;
740                 case 17:
741                         size = truncate_sz ("Root Path", sizeof (NetOurRootPath), oplen);
742                         memcpy (&NetOurRootPath, popt + 2, size);
743                         NetOurRootPath[size] = 0;
744                         break;
745 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
746                 case 42:        /* NTP server IP */
747                         NetCopyIP (&NetNtpServerIP, (popt + 2));
748                         break;
749 #endif
750                 case 51:
751                         NetCopyLong (&dhcp_leasetime, (ulong *) (popt + 2));
752                         break;
753                 case 53:        /* Ignore Message Type Option */
754                         break;
755                 case 54:
756                         NetCopyIP (&NetDHCPServerIP, (popt + 2));
757                         break;
758                 case 58:        /* Ignore Renewal Time Option */
759                         break;
760                 case 59:        /* Ignore Rebinding Time Option */
761                         break;
762                 case 66:        /* Ignore TFTP server name */
763                         break;
764                 case 67:        /* vendor opt bootfile */
765                         /*
766                          * I can't use dhcp_vendorex_proc here because I need
767                          * to write into the bootp packet - even then I had to
768                          * pass the bootp packet pointer into here as the
769                          * second arg
770                          */
771                         size = truncate_sz ("Opt Boot File",
772                                             sizeof(bp->bp_file),
773                                             oplen);
774                         if (bp->bp_file[0] == '\0' && size > 0) {
775                                 /*
776                                  * only use vendor boot file if we didn't
777                                  * receive a boot file in the main non-vendor
778                                  * part of the packet - god only knows why
779                                  * some vendors chose not to use this perfectly
780                                  * good spot to store the boot file (join on
781                                  * Tru64 Unix) it seems mind bogglingly crazy
782                                  * to me
783                                  */
784                                 printf("*** WARNING: using vendor "
785                                         "optional boot file\n");
786                                 memcpy(bp->bp_file, popt + 2, size);
787                                 bp->bp_file[size] = '\0';
788                         }
789                         break;
790                 default:
791 #if defined(CONFIG_BOOTP_VENDOREX)
792                         if (dhcp_vendorex_proc (popt))
793                                 break;
794 #endif
795                         printf ("*** Unhandled DHCP Option in OFFER/ACK: %d\n", *popt);
796                         break;
797                 }
798                 popt += oplen + 2;      /* Process next option */
799         }
800 }
801
802 static int DhcpMessageType(unsigned char *popt)
803 {
804         if (NetReadLong((ulong*)popt) != htonl(BOOTP_VENDOR_MAGIC))
805                 return -1;
806
807         popt += 4;
808         while ( *popt != 0xff ) {
809                 if ( *popt == 53 )      /* DHCP Message Type */
810                         return *(popt + 2);
811                 popt += *(popt + 1) + 2;        /* Scan through all options */
812         }
813         return -1;
814 }
815
816 static void DhcpSendRequestPkt(Bootp_t *bp_offer)
817 {
818         volatile uchar *pkt, *iphdr;
819         Bootp_t *bp;
820         int pktlen, iplen, extlen;
821         IPaddr_t OfferedIP;
822
823         debug ("DhcpSendRequestPkt: Sending DHCPREQUEST\n");
824         pkt = NetTxPacket;
825         memset ((void*)pkt, 0, PKTSIZE);
826
827         pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP);
828
829         iphdr = pkt;            /* We'll need this later to set proper pkt size */
830         pkt += IP_HDR_SIZE;
831
832         bp = (Bootp_t *)pkt;
833         bp->bp_op = OP_BOOTREQUEST;
834         bp->bp_htype = HWT_ETHER;
835         bp->bp_hlen = HWL_ETHER;
836         bp->bp_hops = 0;
837         bp->bp_secs = htons(get_timer(0) / 1000);
838         /* Do not set the client IP, your IP, or server IP yet, since it hasn't been ACK'ed by
839          * the server yet */
840
841         /*
842          * RFC3046 requires Relay Agents to discard packets with
843          * nonzero and offered giaddr
844          */
845         NetWriteIP(&bp->bp_giaddr, 0);
846
847         memcpy (bp->bp_chaddr, NetOurEther, 6);
848
849         /*
850          * ID is the id of the OFFER packet
851          */
852
853         NetCopyLong(&bp->bp_id, &bp_offer->bp_id);
854
855         /*
856          * Copy options from OFFER packet if present
857          */
858
859         /* Copy offered IP into the parameters request list */
860         NetCopyIP(&OfferedIP, &bp_offer->bp_yiaddr);
861         extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_REQUEST, NetDHCPServerIP, OfferedIP);
862
863         pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen;
864         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen;
865         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
866
867         debug ("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
868 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
869         udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
870 #endif  /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
871         NetSendPacket(NetTxPacket, pktlen);
872 }
873
874 /*
875  *      Handle DHCP received packets.
876  */
877 static void
878 DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
879 {
880         Bootp_t *bp = (Bootp_t *)pkt;
881
882         debug ("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
883                 src, dest, len, dhcp_state);
884
885         if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
886                 return;
887
888         debug ("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n",
889                 src, dest, len, dhcp_state);
890
891         switch (dhcp_state) {
892         case SELECTING:
893                 /*
894                  * Wait an appropriate time for any potential DHCPOFFER packets
895                  * to arrive.  Then select one, and generate DHCPREQUEST response.
896                  * If filename is in format we recognize, assume it is a valid
897                  * OFFER from a server we want.
898                  */
899                 debug ("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
900 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
901                 if (strncmp(bp->bp_file,
902                             CONFIG_SYS_BOOTFILE_PREFIX,
903                             strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0 ) {
904 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
905
906                         debug ("TRANSITIONING TO REQUESTING STATE\n");
907                         dhcp_state = REQUESTING;
908
909                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
910                                 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
911
912                         NetSetTimeout(TIMEOUT, BootpTimeout);
913                         DhcpSendRequestPkt(bp);
914 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
915                 }
916 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
917
918                 return;
919                 break;
920         case REQUESTING:
921                 debug ("DHCP State: REQUESTING\n");
922
923                 if ( DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK ) {
924                         char *s;
925
926                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
927                                 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
928                         BootpCopyNetParams(bp); /* Store net params from reply */
929                         dhcp_state = BOUND;
930                         printf ("DHCP client bound to address %pI4\n", &NetOurIP);
931
932                         /* Obey the 'autoload' setting */
933                         if ((s = getenv("autoload")) != NULL) {
934                                 if (*s == 'n') {
935                                         /*
936                                          * Just use BOOTP to configure system;
937                                          * Do not use TFTP to load the bootfile.
938                                          */
939                                         NetState = NETLOOP_SUCCESS;
940                                         return;
941 #if defined(CONFIG_CMD_NFS)
942                                 } else if (strcmp(s, "NFS") == 0) {
943                                         /*
944                                          * Use NFS to load the bootfile.
945                                          */
946                                         NfsStart();
947                                         return;
948 #endif
949                                 }
950                         }
951                         TftpStart();
952                         return;
953                 }
954                 break;
955         case BOUND:
956                 /* DHCP client bound to address */
957                 break;
958         default:
959                 puts ("DHCP: INVALID STATE\n");
960                 break;
961         }
962
963 }
964
965 void DhcpRequest(void)
966 {
967         BootpRequest();
968 }
969 #endif  /* CONFIG_CMD_DHCP */
970
971 #endif  /* CONFIG_CMD_NET */