powerpc/85xx: Refactor some defines out of corenet_ds.h
[platform/kernel/u-boot.git] / 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 #include <common.h>
12 #include <command.h>
13 #include <net.h>
14 #include "bootp.h"
15 #include "tftp.h"
16 #include "nfs.h"
17 #ifdef CONFIG_STATUS_LED
18 #include <status_led.h>
19 #endif
20
21 #define BOOTP_VENDOR_MAGIC      0x63825363      /* RFC1048 Magic Cookie         */
22
23 #define TIMEOUT         5000UL  /* Milliseconds before trying BOOTP again */
24 #ifndef CONFIG_NET_RETRY_COUNT
25 # define TIMEOUT_COUNT  5               /* # of timeouts before giving up  */
26 #else
27 # define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT)
28 #endif
29
30 #define PORT_BOOTPS     67              /* BOOTP server UDP port                */
31 #define PORT_BOOTPC     68              /* BOOTP client UDP port                */
32
33 #ifndef CONFIG_DHCP_MIN_EXT_LEN         /* minimal length of extension list     */
34 #define CONFIG_DHCP_MIN_EXT_LEN 64
35 #endif
36
37 ulong           BootpID;
38 int             BootpTry;
39 #ifdef CONFIG_BOOTP_RANDOM_DELAY
40 ulong           seed1, seed2;
41 #endif
42
43 #if defined(CONFIG_CMD_DHCP)
44 dhcp_state_t dhcp_state = INIT;
45 unsigned long dhcp_leasetime = 0;
46 IPaddr_t NetDHCPServerIP = 0;
47 static void DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
48                         unsigned len);
49
50 /* For Debug */
51 #if 0
52 static char *dhcpmsg2str(int type)
53 {
54         switch (type) {
55         case 1:  return "DHCPDISCOVER"; break;
56         case 2:  return "DHCPOFFER";    break;
57         case 3:  return "DHCPREQUEST";  break;
58         case 4:  return "DHCPDECLINE";  break;
59         case 5:  return "DHCPACK";      break;
60         case 6:  return "DHCPNACK";     break;
61         case 7:  return "DHCPRELEASE";  break;
62         default: return "UNKNOWN/INVALID MSG TYPE"; break;
63         }
64 }
65 #endif
66
67 #if defined(CONFIG_BOOTP_VENDOREX)
68 extern u8 *dhcp_vendorex_prep (u8 *e); /*rtn new e after add own opts. */
69 extern u8 *dhcp_vendorex_proc (u8 *e); /*rtn next e if mine,else NULL  */
70 #endif
71
72 #endif
73
74 static int BootpCheckPkt(uchar *pkt, unsigned dest, unsigned src, unsigned len)
75 {
76         Bootp_t *bp = (Bootp_t *) pkt;
77         int retval = 0;
78
79         if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
80                 retval = -1;
81         else if (len < sizeof (Bootp_t) - OPT_SIZE)
82                 retval = -2;
83         else if (bp->bp_op != OP_BOOTREQUEST &&
84             bp->bp_op != OP_BOOTREPLY &&
85             bp->bp_op != DHCP_OFFER &&
86             bp->bp_op != DHCP_ACK &&
87             bp->bp_op != DHCP_NAK ) {
88                 retval = -3;
89         }
90         else if (bp->bp_htype != HWT_ETHER)
91                 retval = -4;
92         else if (bp->bp_hlen != HWL_ETHER)
93                 retval = -5;
94         else if (NetReadLong((ulong*)&bp->bp_id) != BootpID) {
95                 retval = -6;
96         }
97
98         debug("Filtering pkt = %d\n", retval);
99
100         return retval;
101 }
102
103 /*
104  * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet
105  */
106 static void BootpCopyNetParams(Bootp_t *bp)
107 {
108         IPaddr_t tmp_ip;
109
110         NetCopyIP(&NetOurIP, &bp->bp_yiaddr);
111 #if !defined(CONFIG_BOOTP_SERVERIP)
112         NetCopyIP(&tmp_ip, &bp->bp_siaddr);
113         if (tmp_ip != 0)
114                 NetCopyIP(&NetServerIP, &bp->bp_siaddr);
115         memcpy (NetServerEther, ((Ethernet_t *)NetRxPacket)->et_src, 6);
116 #endif
117         if (strlen(bp->bp_file) > 0)
118                 copy_filename (BootFile, bp->bp_file, sizeof(BootFile));
119
120         debug("Bootfile: %s\n", BootFile);
121
122         /* Propagate to environment:
123          * don't delete exising entry when BOOTP / DHCP reply does
124          * not contain a new value
125          */
126         if (*BootFile) {
127                 setenv ("bootfile", BootFile);
128         }
129 }
130
131 static int truncate_sz (const char *name, int maxlen, int curlen)
132 {
133         if (curlen >= maxlen) {
134                 printf("*** WARNING: %s is too long (%d - max: %d) - truncated\n",
135                         name, curlen, maxlen);
136                 curlen = maxlen - 1;
137         }
138         return (curlen);
139 }
140
141 /*
142  * Check if autoload is enabled. If so, use either NFS or TFTP to download
143  * the boot file.
144  */
145 static void auto_load(void)
146 {
147         const char *s = getenv("autoload");
148
149         if (s != NULL) {
150                 if (*s == 'n') {
151                         /*
152                          * Just use BOOTP to configure system;
153                          * Do not use TFTP to load the bootfile.
154                          */
155                         NetState = NETLOOP_SUCCESS;
156                         return;
157                 }
158 #if defined(CONFIG_CMD_NFS)
159                 if (strcmp(s, "NFS") == 0) {
160                         /*
161                          * Use NFS to load the bootfile.
162                          */
163                         NfsStart();
164                         return;
165                 }
166 #endif
167         }
168         TftpStart();
169 }
170
171 #if !defined(CONFIG_CMD_DHCP)
172
173 static void BootpVendorFieldProcess (u8 * ext)
174 {
175         int size = *(ext + 1);
176
177         debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext,
178                    *(ext + 1));
179
180         NetBootFileSize = 0;
181
182         switch (*ext) {
183                 /* Fixed length fields */
184         case 1:                 /* Subnet mask                                  */
185                 if (NetOurSubnetMask == 0)
186                         NetCopyIP (&NetOurSubnetMask, (IPaddr_t *) (ext + 2));
187                 break;
188         case 2:                 /* Time offset - Not yet supported              */
189                 break;
190                 /* Variable length fields */
191         case 3:                 /* Gateways list                                */
192                 if (NetOurGatewayIP == 0) {
193                         NetCopyIP (&NetOurGatewayIP, (IPaddr_t *) (ext + 2));
194                 }
195                 break;
196         case 4:                 /* Time server - Not yet supported              */
197                 break;
198         case 5:                 /* IEN-116 name server - Not yet supported      */
199                 break;
200         case 6:
201                 if (NetOurDNSIP == 0) {
202                         NetCopyIP (&NetOurDNSIP, (IPaddr_t *) (ext + 2));
203                 }
204 #if defined(CONFIG_BOOTP_DNS2)
205                 if ((NetOurDNS2IP == 0) && (size > 4)) {
206                         NetCopyIP (&NetOurDNS2IP, (IPaddr_t *) (ext + 2 + 4));
207                 }
208 #endif
209                 break;
210         case 7:                 /* Log server - Not yet supported               */
211                 break;
212         case 8:                 /* Cookie/Quote server - Not yet supported      */
213                 break;
214         case 9:                 /* LPR server - Not yet supported               */
215                 break;
216         case 10:                /* Impress server - Not yet supported           */
217                 break;
218         case 11:                /* RPL server - Not yet supported               */
219                 break;
220         case 12:                /* Host name                                    */
221                 if (NetOurHostName[0] == 0) {
222                         size = truncate_sz ("Host Name", sizeof (NetOurHostName), size);
223                         memcpy (&NetOurHostName, ext + 2, size);
224                         NetOurHostName[size] = 0;
225                 }
226                 break;
227         case 13:                /* Boot file size                               */
228                 if (size == 2)
229                         NetBootFileSize = ntohs (*(ushort *) (ext + 2));
230                 else if (size == 4)
231                         NetBootFileSize = ntohl (*(ulong *) (ext + 2));
232                 break;
233         case 14:                /* Merit dump file - Not yet supported          */
234                 break;
235         case 15:                /* Domain name - Not yet supported              */
236                 break;
237         case 16:                /* Swap server - Not yet supported              */
238                 break;
239         case 17:                /* Root path                                    */
240                 if (NetOurRootPath[0] == 0) {
241                         size = truncate_sz ("Root Path", sizeof (NetOurRootPath), size);
242                         memcpy (&NetOurRootPath, ext + 2, size);
243                         NetOurRootPath[size] = 0;
244                 }
245                 break;
246         case 18:                /* Extension path - Not yet supported           */
247                 /*
248                  * This can be used to send the information of the
249                  * vendor area in another file that the client can
250                  * access via TFTP.
251                  */
252                 break;
253                 /* IP host layer fields */
254         case 40:                /* NIS Domain name                              */
255                 if (NetOurNISDomain[0] == 0) {
256                         size = truncate_sz ("NIS Domain Name", sizeof (NetOurNISDomain), size);
257                         memcpy (&NetOurNISDomain, ext + 2, size);
258                         NetOurNISDomain[size] = 0;
259                 }
260                 break;
261 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
262         case 42:        /* NTP server IP */
263                 NetCopyIP(&NetNtpServerIP, (IPaddr_t *) (ext + 2));
264                 break;
265 #endif
266                 /* Application layer fields */
267         case 43:                /* Vendor specific info - Not yet supported     */
268                 /*
269                  * Binary information to exchange specific
270                  * product information.
271                  */
272                 break;
273                 /* Reserved (custom) fields (128..254) */
274         }
275 }
276
277 static void BootpVendorProcess (u8 * ext, int size)
278 {
279         u8 *end = ext + size;
280
281         debug("[BOOTP] Checking extension (%d bytes)...\n", size);
282
283         while ((ext < end) && (*ext != 0xff)) {
284                 if (*ext == 0) {
285                         ext++;
286                 } else {
287                         u8 *opt = ext;
288
289                         ext += ext[1] + 2;
290                         if (ext <= end)
291                                 BootpVendorFieldProcess (opt);
292                 }
293         }
294
295         debug("[BOOTP] Received fields: \n");
296         if (NetOurSubnetMask)
297                 debug("NetOurSubnetMask : %pI4\n", &NetOurSubnetMask);
298
299         if (NetOurGatewayIP)
300                 debug("NetOurGatewayIP  : %pI4", &NetOurGatewayIP);
301
302         if (NetBootFileSize)
303                 debug("NetBootFileSize : %d\n", NetBootFileSize);
304
305         if (NetOurHostName[0])
306                 debug("NetOurHostName  : %s\n", NetOurHostName);
307
308         if (NetOurRootPath[0])
309                 debug("NetOurRootPath  : %s\n", NetOurRootPath);
310
311         if (NetOurNISDomain[0])
312                 debug("NetOurNISDomain : %s\n", NetOurNISDomain);
313
314         if (NetBootFileSize)
315                 debug("NetBootFileSize: %d\n", NetBootFileSize);
316
317 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
318         if (NetNtpServerIP)
319                 debug("NetNtpServerIP : %pI4\n", &NetNtpServerIP);
320 #endif
321 }
322
323 /*
324  *      Handle a BOOTP received packet.
325  */
326 static void
327 BootpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
328              unsigned len)
329 {
330         Bootp_t *bp;
331
332         debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n",
333                 src, dest, len, sizeof (Bootp_t));
334
335         bp = (Bootp_t *)pkt;
336
337         if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
338                 return;
339
340         /*
341          *      Got a good BOOTP reply.  Copy the data into our variables.
342          */
343 #ifdef CONFIG_STATUS_LED
344         status_led_set (STATUS_LED_BOOT, STATUS_LED_OFF);
345 #endif
346
347         BootpCopyNetParams(bp);         /* Store net parameters from reply */
348
349         /* Retrieve extended information (we must parse the vendor area) */
350         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
351                 BootpVendorProcess((uchar *)&bp->bp_vend[4], len);
352
353         NetSetTimeout(0, (thand_f *)0);
354
355         debug("Got good BOOTP\n");
356
357         auto_load();
358 }
359 #endif
360
361 /*
362  *      Timeout on BOOTP/DHCP request.
363  */
364 static void
365 BootpTimeout(void)
366 {
367         if (BootpTry >= TIMEOUT_COUNT) {
368                 puts ("\nRetry count exceeded; starting again\n");
369                 NetStartAgain ();
370         } else {
371                 NetSetTimeout (TIMEOUT, BootpTimeout);
372                 BootpRequest ();
373         }
374 }
375
376 /*
377  *      Initialize BOOTP extension fields in the request.
378  */
379 #if defined(CONFIG_CMD_DHCP)
380 static int DhcpExtended (u8 * e, int message_type, IPaddr_t ServerID, IPaddr_t RequestedIP)
381 {
382         u8 *start = e;
383         u8 *cnt;
384
385 #if defined(CONFIG_BOOTP_VENDOREX)
386         u8 *x;
387 #endif
388 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
389         char *hostname;
390 #endif
391
392         *e++ = 99;              /* RFC1048 Magic Cookie */
393         *e++ = 130;
394         *e++ = 83;
395         *e++ = 99;
396
397         *e++ = 53;              /* DHCP Message Type */
398         *e++ = 1;
399         *e++ = message_type;
400
401         *e++ = 57;              /* Maximum DHCP Message Size */
402         *e++ = 2;
403         *e++ = (576 - 312 + OPT_SIZE) >> 8;
404         *e++ = (576 - 312 + OPT_SIZE) & 0xff;
405
406         if (ServerID) {
407                 int tmp = ntohl (ServerID);
408
409                 *e++ = 54;      /* ServerID */
410                 *e++ = 4;
411                 *e++ = tmp >> 24;
412                 *e++ = tmp >> 16;
413                 *e++ = tmp >> 8;
414                 *e++ = tmp & 0xff;
415         }
416
417         if (RequestedIP) {
418                 int tmp = ntohl (RequestedIP);
419
420                 *e++ = 50;      /* Requested IP */
421                 *e++ = 4;
422                 *e++ = tmp >> 24;
423                 *e++ = tmp >> 16;
424                 *e++ = tmp >> 8;
425                 *e++ = tmp & 0xff;
426         }
427 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
428         if ((hostname = getenv ("hostname"))) {
429                 int hostnamelen = strlen (hostname);
430
431                 *e++ = 12;      /* Hostname */
432                 *e++ = hostnamelen;
433                 memcpy (e, hostname, hostnamelen);
434                 e += hostnamelen;
435         }
436 #endif
437
438 #if defined(CONFIG_BOOTP_VENDOREX)
439         if ((x = dhcp_vendorex_prep (e)))
440                 return x - start;
441 #endif
442
443         *e++ = 55;              /* Parameter Request List */
444          cnt = e++;             /* Pointer to count of requested items */
445         *cnt = 0;
446 #if defined(CONFIG_BOOTP_SUBNETMASK)
447         *e++  = 1;              /* Subnet Mask */
448         *cnt += 1;
449 #endif
450 #if defined(CONFIG_BOOTP_TIMEOFFSET)
451         *e++  = 2;
452         *cnt += 1;
453 #endif
454 #if defined(CONFIG_BOOTP_GATEWAY)
455         *e++  = 3;              /* Router Option */
456         *cnt += 1;
457 #endif
458 #if defined(CONFIG_BOOTP_DNS)
459         *e++  = 6;              /* DNS Server(s) */
460         *cnt += 1;
461 #endif
462 #if defined(CONFIG_BOOTP_HOSTNAME)
463         *e++  = 12;             /* Hostname */
464         *cnt += 1;
465 #endif
466 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
467         *e++  = 13;             /* Boot File Size */
468         *cnt += 1;
469 #endif
470 #if defined(CONFIG_BOOTP_BOOTPATH)
471         *e++  = 17;             /* Boot path */
472         *cnt += 1;
473 #endif
474 #if defined(CONFIG_BOOTP_NISDOMAIN)
475         *e++  = 40;             /* NIS Domain name request */
476         *cnt += 1;
477 #endif
478 #if defined(CONFIG_BOOTP_NTPSERVER)
479         *e++  = 42;
480         *cnt += 1;
481 #endif
482         /* no options, so back up to avoid sending an empty request list */
483         if (*cnt == 0)
484                 e -= 2;
485
486         *e++  = 255;            /* End of the list */
487
488         /* Pad to minimal length */
489 #ifdef  CONFIG_DHCP_MIN_EXT_LEN
490         while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN)
491                 *e++ = 0;
492 #endif
493
494         return e - start;
495 }
496
497 #else
498 /*
499  *      Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
500  */
501 static int BootpExtended (u8 * e)
502 {
503         u8 *start = e;
504
505         *e++ = 99;              /* RFC1048 Magic Cookie */
506         *e++ = 130;
507         *e++ = 83;
508         *e++ = 99;
509
510 #if defined(CONFIG_CMD_DHCP)
511         *e++ = 53;              /* DHCP Message Type */
512         *e++ = 1;
513         *e++ = DHCP_DISCOVER;
514
515         *e++ = 57;              /* Maximum DHCP Message Size */
516         *e++ = 2;
517         *e++ = (576 - 312 + OPT_SIZE) >> 16;
518         *e++ = (576 - 312 + OPT_SIZE) & 0xff;
519 #endif
520
521 #if defined(CONFIG_BOOTP_SUBNETMASK)
522         *e++ = 1;               /* Subnet mask request */
523         *e++ = 4;
524         e   += 4;
525 #endif
526
527 #if defined(CONFIG_BOOTP_GATEWAY)
528         *e++ = 3;               /* Default gateway request */
529         *e++ = 4;
530         e   += 4;
531 #endif
532
533 #if defined(CONFIG_BOOTP_DNS)
534         *e++ = 6;               /* Domain Name Server */
535         *e++ = 4;
536         e   += 4;
537 #endif
538
539 #if defined(CONFIG_BOOTP_HOSTNAME)
540         *e++ = 12;              /* Host name request */
541         *e++ = 32;
542         e   += 32;
543 #endif
544
545 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
546         *e++ = 13;              /* Boot file size */
547         *e++ = 2;
548         e   += 2;
549 #endif
550
551 #if defined(CONFIG_BOOTP_BOOTPATH)
552         *e++ = 17;              /* Boot path */
553         *e++ = 32;
554         e   += 32;
555 #endif
556
557 #if defined(CONFIG_BOOTP_NISDOMAIN)
558         *e++ = 40;              /* NIS Domain name request */
559         *e++ = 32;
560         e   += 32;
561 #endif
562 #if defined(CONFIG_BOOTP_NTPSERVER)
563         *e++ = 42;
564         *e++ = 4;
565         e   += 4;
566 #endif
567
568         *e++ = 255;             /* End of the list */
569
570         return e - start;
571 }
572 #endif
573
574 void
575 BootpRequest (void)
576 {
577         volatile uchar *pkt, *iphdr;
578         Bootp_t *bp;
579         int ext_len, pktlen, iplen;
580
581 #if defined(CONFIG_CMD_DHCP)
582         dhcp_state = INIT;
583 #endif
584
585 #ifdef CONFIG_BOOTP_RANDOM_DELAY                /* Random BOOTP delay */
586         unsigned char bi_enetaddr[6];
587         int   reg;
588         ulong tst1, tst2, sum, m_mask, m_value = 0;
589
590         if (BootpTry ==0) {
591                 /* get our mac */
592                 eth_getenv_enetaddr("ethaddr", bi_enetaddr);
593
594                 debug("BootpRequest => Our Mac: ");
595                 for (reg=0; reg<6; reg++)
596                         debug("%x%c", bi_enetaddr[reg], reg==5 ? '\n' : ':');
597
598                 /* Mac-Manipulation 2 get seed1 */
599                 tst1=0;
600                 tst2=0;
601                 for (reg=2; reg<6; reg++) {
602                         tst1 = tst1 << 8;
603                         tst1 = tst1 | bi_enetaddr[reg];
604                 }
605                 for (reg=0; reg<2; reg++) {
606                         tst2 = tst2 | bi_enetaddr[reg];
607                         tst2 = tst2 << 8;
608                 }
609
610                 seed1 = tst1^tst2;
611
612                 /* Mirror seed1*/
613                 m_mask=0x1;
614                 for (reg=1;reg<=32;reg++) {
615                         m_value |= (m_mask & seed1);
616                         seed1 = seed1 >> 1;
617                         m_value = m_value << 1;
618                 }
619                 seed1 = m_value;
620                 seed2 = 0xB78D0945;
621         }
622
623         /* Random Number Generator */
624
625         for (reg=0;reg<=0;reg++) {
626                 sum = seed1 + seed2;
627                 if (sum < seed1 || sum < seed2)
628                         sum++;
629                 seed2 = seed1;
630                 seed1 = sum;
631
632                 if (BootpTry<=2) {      /* Start with max 1024 * 1ms */
633                         sum = sum >> (22-BootpTry);
634                 } else {                /*After 3rd BOOTP request max 8192 * 1ms */
635                         sum = sum >> 19;
636                 }
637         }
638
639         printf ("Random delay: %ld ms...\n", sum);
640         for (reg=0; reg <sum; reg++) {
641                 udelay(1000); /*Wait 1ms*/
642         }
643 #endif  /* CONFIG_BOOTP_RANDOM_DELAY */
644
645         printf("BOOTP broadcast %d\n", ++BootpTry);
646         pkt = NetTxPacket;
647         memset ((void*)pkt, 0, PKTSIZE);
648
649         pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP);
650
651         /*
652          * Next line results in incorrect packet size being transmitted, resulting
653          * in errors in some DHCP servers, reporting missing bytes.  Size must be
654          * set in packet header after extension length has been determined.
655          * C. Hallinan, DS4.COM, Inc.
656          */
657         /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */
658         iphdr = pkt;    /* We need this later for NetSetIP() */
659         pkt += IP_HDR_SIZE;
660
661         bp = (Bootp_t *)pkt;
662         bp->bp_op = OP_BOOTREQUEST;
663         bp->bp_htype = HWT_ETHER;
664         bp->bp_hlen = HWL_ETHER;
665         bp->bp_hops = 0;
666         bp->bp_secs = htons(get_timer(0) / 1000);
667         NetWriteIP(&bp->bp_ciaddr, 0);
668         NetWriteIP(&bp->bp_yiaddr, 0);
669         NetWriteIP(&bp->bp_siaddr, 0);
670         NetWriteIP(&bp->bp_giaddr, 0);
671         memcpy (bp->bp_chaddr, NetOurEther, 6);
672         copy_filename (bp->bp_file, BootFile, sizeof(bp->bp_file));
673
674         /* Request additional information from the BOOTP/DHCP server */
675 #if defined(CONFIG_CMD_DHCP)
676         ext_len = DhcpExtended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0);
677 #else
678         ext_len = BootpExtended((u8 *)bp->bp_vend);
679 #endif
680
681         /*
682          *      Bootp ID is the lower 4 bytes of our ethernet address
683          *      plus the current time in ms.
684          */
685         BootpID = ((ulong)NetOurEther[2] << 24)
686                 | ((ulong)NetOurEther[3] << 16)
687                 | ((ulong)NetOurEther[4] << 8)
688                 | (ulong)NetOurEther[5];
689         BootpID += get_timer(0);
690         BootpID  = htonl(BootpID);
691         NetCopyLong(&bp->bp_id, &BootpID);
692
693         /*
694          * Calculate proper packet lengths taking into account the
695          * variable size of the options field
696          */
697         pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len;
698         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len;
699         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
700         NetSetTimeout(SELECT_TIMEOUT, BootpTimeout);
701
702 #if defined(CONFIG_CMD_DHCP)
703         dhcp_state = SELECTING;
704         NetSetHandler(DhcpHandler);
705 #else
706         NetSetHandler(BootpHandler);
707 #endif
708         NetSendPacket(NetTxPacket, pktlen);
709 }
710
711 #if defined(CONFIG_CMD_DHCP)
712 static void DhcpOptionsProcess (uchar * popt, Bootp_t *bp)
713 {
714         uchar *end = popt + BOOTP_HDR_SIZE;
715         int oplen, size;
716 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
717         int *to_ptr;
718 #endif
719
720         while (popt < end && *popt != 0xff) {
721                 oplen = *(popt + 1);
722                 switch (*popt) {
723                 case 1:
724                         NetCopyIP (&NetOurSubnetMask, (popt + 2));
725                         break;
726 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
727                 case 2:         /* Time offset  */
728                         to_ptr = &NetTimeOffset;
729                         NetCopyLong ((ulong *)to_ptr, (ulong *)(popt + 2));
730                         NetTimeOffset = ntohl (NetTimeOffset);
731                         break;
732 #endif
733                 case 3:
734                         NetCopyIP (&NetOurGatewayIP, (popt + 2));
735                         break;
736                 case 6:
737                         NetCopyIP (&NetOurDNSIP, (popt + 2));
738 #if defined(CONFIG_BOOTP_DNS2)
739                         if (*(popt + 1) > 4) {
740                                 NetCopyIP (&NetOurDNS2IP, (popt + 2 + 4));
741                         }
742 #endif
743                         break;
744                 case 12:
745                         size = truncate_sz ("Host Name", sizeof (NetOurHostName), oplen);
746                         memcpy (&NetOurHostName, popt + 2, size);
747                         NetOurHostName[size] = 0;
748                         break;
749                 case 15:        /* Ignore Domain Name Option */
750                         break;
751                 case 17:
752                         size = truncate_sz ("Root Path", sizeof (NetOurRootPath), oplen);
753                         memcpy (&NetOurRootPath, popt + 2, size);
754                         NetOurRootPath[size] = 0;
755                         break;
756 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
757                 case 42:        /* NTP server IP */
758                         NetCopyIP (&NetNtpServerIP, (popt + 2));
759                         break;
760 #endif
761                 case 51:
762                         NetCopyLong (&dhcp_leasetime, (ulong *) (popt + 2));
763                         break;
764                 case 53:        /* Ignore Message Type Option */
765                         break;
766                 case 54:
767                         NetCopyIP (&NetDHCPServerIP, (popt + 2));
768                         break;
769                 case 58:        /* Ignore Renewal Time Option */
770                         break;
771                 case 59:        /* Ignore Rebinding Time Option */
772                         break;
773                 case 66:        /* Ignore TFTP server name */
774                         break;
775                 case 67:        /* vendor opt bootfile */
776                         /*
777                          * I can't use dhcp_vendorex_proc here because I need
778                          * to write into the bootp packet - even then I had to
779                          * pass the bootp packet pointer into here as the
780                          * second arg
781                          */
782                         size = truncate_sz ("Opt Boot File",
783                                             sizeof(bp->bp_file),
784                                             oplen);
785                         if (bp->bp_file[0] == '\0' && size > 0) {
786                                 /*
787                                  * only use vendor boot file if we didn't
788                                  * receive a boot file in the main non-vendor
789                                  * part of the packet - god only knows why
790                                  * some vendors chose not to use this perfectly
791                                  * good spot to store the boot file (join on
792                                  * Tru64 Unix) it seems mind bogglingly crazy
793                                  * to me
794                                  */
795                                 printf("*** WARNING: using vendor "
796                                         "optional boot file\n");
797                                 memcpy(bp->bp_file, popt + 2, size);
798                                 bp->bp_file[size] = '\0';
799                         }
800                         break;
801                 default:
802 #if defined(CONFIG_BOOTP_VENDOREX)
803                         if (dhcp_vendorex_proc (popt))
804                                 break;
805 #endif
806                         printf ("*** Unhandled DHCP Option in OFFER/ACK: %d\n", *popt);
807                         break;
808                 }
809                 popt += oplen + 2;      /* Process next option */
810         }
811 }
812
813 static int DhcpMessageType(unsigned char *popt)
814 {
815         if (NetReadLong((ulong*)popt) != htonl(BOOTP_VENDOR_MAGIC))
816                 return -1;
817
818         popt += 4;
819         while ( *popt != 0xff ) {
820                 if ( *popt == 53 )      /* DHCP Message Type */
821                         return *(popt + 2);
822                 popt += *(popt + 1) + 2;        /* Scan through all options */
823         }
824         return -1;
825 }
826
827 static void DhcpSendRequestPkt(Bootp_t *bp_offer)
828 {
829         volatile uchar *pkt, *iphdr;
830         Bootp_t *bp;
831         int pktlen, iplen, extlen;
832         IPaddr_t OfferedIP;
833
834         debug("DhcpSendRequestPkt: Sending DHCPREQUEST\n");
835         pkt = NetTxPacket;
836         memset ((void*)pkt, 0, PKTSIZE);
837
838         pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP);
839
840         iphdr = pkt;            /* We'll need this later to set proper pkt size */
841         pkt += IP_HDR_SIZE;
842
843         bp = (Bootp_t *)pkt;
844         bp->bp_op = OP_BOOTREQUEST;
845         bp->bp_htype = HWT_ETHER;
846         bp->bp_hlen = HWL_ETHER;
847         bp->bp_hops = 0;
848         bp->bp_secs = htons(get_timer(0) / 1000);
849         /* Do not set the client IP, your IP, or server IP yet, since it hasn't been ACK'ed by
850          * the server yet */
851
852         /*
853          * RFC3046 requires Relay Agents to discard packets with
854          * nonzero and offered giaddr
855          */
856         NetWriteIP(&bp->bp_giaddr, 0);
857
858         memcpy (bp->bp_chaddr, NetOurEther, 6);
859
860         /*
861          * ID is the id of the OFFER packet
862          */
863
864         NetCopyLong(&bp->bp_id, &bp_offer->bp_id);
865
866         /*
867          * Copy options from OFFER packet if present
868          */
869
870         /* Copy offered IP into the parameters request list */
871         NetCopyIP(&OfferedIP, &bp_offer->bp_yiaddr);
872         extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_REQUEST, NetDHCPServerIP, OfferedIP);
873
874         pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen;
875         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen;
876         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
877
878         debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
879 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
880         udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
881 #endif  /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
882         NetSendPacket(NetTxPacket, pktlen);
883 }
884
885 /*
886  *      Handle DHCP received packets.
887  */
888 static void
889 DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
890             unsigned len)
891 {
892         Bootp_t *bp = (Bootp_t *)pkt;
893
894         debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
895                 src, dest, len, dhcp_state);
896
897         if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
898                 return;
899
900         debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n",
901                 src, dest, len, dhcp_state);
902
903         switch (dhcp_state) {
904         case SELECTING:
905                 /*
906                  * Wait an appropriate time for any potential DHCPOFFER packets
907                  * to arrive.  Then select one, and generate DHCPREQUEST response.
908                  * If filename is in format we recognize, assume it is a valid
909                  * OFFER from a server we want.
910                  */
911                 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
912 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
913                 if (strncmp(bp->bp_file,
914                             CONFIG_SYS_BOOTFILE_PREFIX,
915                             strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0 ) {
916 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
917
918                         debug("TRANSITIONING TO REQUESTING STATE\n");
919                         dhcp_state = REQUESTING;
920
921                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
922                                 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
923
924                         NetSetTimeout(TIMEOUT, BootpTimeout);
925                         DhcpSendRequestPkt(bp);
926 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
927                 }
928 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
929
930                 return;
931                 break;
932         case REQUESTING:
933                 debug("DHCP State: REQUESTING\n");
934
935                 if ( DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK ) {
936                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
937                                 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
938                         BootpCopyNetParams(bp); /* Store net params from reply */
939                         dhcp_state = BOUND;
940                         printf ("DHCP client bound to address %pI4\n", &NetOurIP);
941
942                         auto_load();
943                         return;
944                 }
945                 break;
946         case BOUND:
947                 /* DHCP client bound to address */
948                 break;
949         default:
950                 puts ("DHCP: INVALID STATE\n");
951                 break;
952         }
953
954 }
955
956 void DhcpRequest(void)
957 {
958         BootpRequest();
959 }
960 #endif  /* CONFIG_CMD_DHCP */