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[people/ms/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 #ifdef CONFIG_BOOTP_RANDOM_DELAY
21 #include "net_rand.h"
22 #endif
23
24 #define BOOTP_VENDOR_MAGIC 0x63825363 /* RFC1048 Magic Cookie */
25
26 /*
27 * The timeout for the initial BOOTP/DHCP request used to be described by a
28 * counter of fixed-length timeout periods. TIMEOUT_COUNT represents
29 * that counter
30 *
31 * Now that the timeout periods are variable (exponential backoff and retry)
32 * we convert the timeout count to the absolute time it would have take to
33 * execute that many retries, and keep sending retry packets until that time
34 * is reached.
35 */
36 #ifndef CONFIG_NET_RETRY_COUNT
37 # define TIMEOUT_COUNT 5 /* # of timeouts before giving up */
38 #else
39 # define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT)
40 #endif
41 #define TIMEOUT_MS ((3 + (TIMEOUT_COUNT * 5)) * 1000)
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 #ifndef CONFIG_BOOTP_ID_CACHE_SIZE
51 #define CONFIG_BOOTP_ID_CACHE_SIZE 4
52 #endif
53
54 ulong bootp_ids[CONFIG_BOOTP_ID_CACHE_SIZE];
55 unsigned int bootp_num_ids;
56 int BootpTry;
57 ulong bootp_start;
58 ulong bootp_timeout;
59
60 #if defined(CONFIG_CMD_DHCP)
61 static dhcp_state_t dhcp_state = INIT;
62 static unsigned long dhcp_leasetime;
63 static IPaddr_t NetDHCPServerIP;
64 static void DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
65 unsigned len);
66
67 /* For Debug */
68 #if 0
69 static char *dhcpmsg2str(int type)
70 {
71 switch (type) {
72 case 1: return "DHCPDISCOVER"; break;
73 case 2: return "DHCPOFFER"; break;
74 case 3: return "DHCPREQUEST"; break;
75 case 4: return "DHCPDECLINE"; break;
76 case 5: return "DHCPACK"; break;
77 case 6: return "DHCPNACK"; break;
78 case 7: return "DHCPRELEASE"; break;
79 default: return "UNKNOWN/INVALID MSG TYPE"; break;
80 }
81 }
82 #endif
83 #endif
84
85 static void bootp_add_id(ulong id)
86 {
87 if (bootp_num_ids >= ARRAY_SIZE(bootp_ids)) {
88 size_t size = sizeof(bootp_ids) - sizeof(id);
89
90 memmove(bootp_ids, &bootp_ids[1], size);
91 bootp_ids[bootp_num_ids - 1] = id;
92 } else {
93 bootp_ids[bootp_num_ids] = id;
94 bootp_num_ids++;
95 }
96 }
97
98 static bool bootp_match_id(ulong id)
99 {
100 unsigned int i;
101
102 for (i = 0; i < bootp_num_ids; i++)
103 if (bootp_ids[i] == id)
104 return true;
105
106 return false;
107 }
108
109 static int BootpCheckPkt(uchar *pkt, unsigned dest, unsigned src, unsigned len)
110 {
111 struct Bootp_t *bp = (struct Bootp_t *) pkt;
112 int retval = 0;
113
114 if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
115 retval = -1;
116 else if (len < sizeof(struct Bootp_t) - OPT_FIELD_SIZE)
117 retval = -2;
118 else if (bp->bp_op != OP_BOOTREQUEST &&
119 bp->bp_op != OP_BOOTREPLY &&
120 bp->bp_op != DHCP_OFFER &&
121 bp->bp_op != DHCP_ACK &&
122 bp->bp_op != DHCP_NAK)
123 retval = -3;
124 else if (bp->bp_htype != HWT_ETHER)
125 retval = -4;
126 else if (bp->bp_hlen != HWL_ETHER)
127 retval = -5;
128 else if (!bootp_match_id(NetReadLong((ulong *)&bp->bp_id)))
129 retval = -6;
130
131 debug("Filtering pkt = %d\n", retval);
132
133 return retval;
134 }
135
136 /*
137 * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet
138 */
139 static void BootpCopyNetParams(struct Bootp_t *bp)
140 {
141 #if !defined(CONFIG_BOOTP_SERVERIP)
142 IPaddr_t tmp_ip;
143
144 NetCopyIP(&tmp_ip, &bp->bp_siaddr);
145 if (tmp_ip != 0)
146 NetCopyIP(&NetServerIP, &bp->bp_siaddr);
147 memcpy(NetServerEther, ((struct ethernet_hdr *)NetRxPacket)->et_src, 6);
148 if (strlen(bp->bp_file) > 0)
149 copy_filename(BootFile, bp->bp_file, sizeof(BootFile));
150
151 debug("Bootfile: %s\n", BootFile);
152
153 /* Propagate to environment:
154 * don't delete exising entry when BOOTP / DHCP reply does
155 * not contain a new value
156 */
157 if (*BootFile)
158 setenv("bootfile", BootFile);
159 #endif
160 NetCopyIP(&NetOurIP, &bp->bp_yiaddr);
161 }
162
163 static int truncate_sz(const char *name, int maxlen, int curlen)
164 {
165 if (curlen >= maxlen) {
166 printf("*** WARNING: %s is too long (%d - max: %d)"
167 " - truncated\n", name, curlen, maxlen);
168 curlen = maxlen - 1;
169 }
170 return curlen;
171 }
172
173 #if !defined(CONFIG_CMD_DHCP)
174
175 static void BootpVendorFieldProcess(u8 *ext)
176 {
177 int size = *(ext + 1);
178
179 debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext,
180 *(ext + 1));
181
182 NetBootFileSize = 0;
183
184 switch (*ext) {
185 /* Fixed length fields */
186 case 1: /* Subnet mask */
187 if (NetOurSubnetMask == 0)
188 NetCopyIP(&NetOurSubnetMask, (IPaddr_t *) (ext + 2));
189 break;
190 case 2: /* Time offset - Not yet supported */
191 break;
192 /* Variable length fields */
193 case 3: /* Gateways list */
194 if (NetOurGatewayIP == 0)
195 NetCopyIP(&NetOurGatewayIP, (IPaddr_t *) (ext + 2));
196 break;
197 case 4: /* Time server - Not yet supported */
198 break;
199 case 5: /* IEN-116 name server - Not yet supported */
200 break;
201 case 6:
202 if (NetOurDNSIP == 0)
203 NetCopyIP(&NetOurDNSIP, (IPaddr_t *) (ext + 2));
204 #if defined(CONFIG_BOOTP_DNS2)
205 if ((NetOurDNS2IP == 0) && (size > 4))
206 NetCopyIP(&NetOurDNS2IP, (IPaddr_t *) (ext + 2 + 4));
207 #endif
208 break;
209 case 7: /* Log server - Not yet supported */
210 break;
211 case 8: /* Cookie/Quote server - Not yet supported */
212 break;
213 case 9: /* LPR server - Not yet supported */
214 break;
215 case 10: /* Impress server - Not yet supported */
216 break;
217 case 11: /* RPL server - Not yet supported */
218 break;
219 case 12: /* Host name */
220 if (NetOurHostName[0] == 0) {
221 size = truncate_sz("Host Name",
222 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",
242 sizeof(NetOurRootPath), size);
243 memcpy(&NetOurRootPath, ext + 2, size);
244 NetOurRootPath[size] = 0;
245 }
246 break;
247 case 18: /* Extension path - Not yet supported */
248 /*
249 * This can be used to send the information of the
250 * vendor area in another file that the client can
251 * access via TFTP.
252 */
253 break;
254 /* IP host layer fields */
255 case 40: /* NIS Domain name */
256 if (NetOurNISDomain[0] == 0) {
257 size = truncate_sz("NIS Domain Name",
258 sizeof(NetOurNISDomain), size);
259 memcpy(&NetOurNISDomain, ext + 2, size);
260 NetOurNISDomain[size] = 0;
261 }
262 break;
263 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
264 case 42: /* NTP server IP */
265 NetCopyIP(&NetNtpServerIP, (IPaddr_t *) (ext + 2));
266 break;
267 #endif
268 /* Application layer fields */
269 case 43: /* Vendor specific info - Not yet supported */
270 /*
271 * Binary information to exchange specific
272 * product information.
273 */
274 break;
275 /* Reserved (custom) fields (128..254) */
276 }
277 }
278
279 static void BootpVendorProcess(u8 *ext, int size)
280 {
281 u8 *end = ext + size;
282
283 debug("[BOOTP] Checking extension (%d bytes)...\n", size);
284
285 while ((ext < end) && (*ext != 0xff)) {
286 if (*ext == 0) {
287 ext++;
288 } else {
289 u8 *opt = ext;
290
291 ext += ext[1] + 2;
292 if (ext <= end)
293 BootpVendorFieldProcess(opt);
294 }
295 }
296
297 debug("[BOOTP] Received fields:\n");
298 if (NetOurSubnetMask)
299 debug("NetOurSubnetMask : %pI4\n", &NetOurSubnetMask);
300
301 if (NetOurGatewayIP)
302 debug("NetOurGatewayIP : %pI4", &NetOurGatewayIP);
303
304 if (NetBootFileSize)
305 debug("NetBootFileSize : %d\n", NetBootFileSize);
306
307 if (NetOurHostName[0])
308 debug("NetOurHostName : %s\n", NetOurHostName);
309
310 if (NetOurRootPath[0])
311 debug("NetOurRootPath : %s\n", NetOurRootPath);
312
313 if (NetOurNISDomain[0])
314 debug("NetOurNISDomain : %s\n", NetOurNISDomain);
315
316 if (NetBootFileSize)
317 debug("NetBootFileSize: %d\n", NetBootFileSize);
318
319 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
320 if (NetNtpServerIP)
321 debug("NetNtpServerIP : %pI4\n", &NetNtpServerIP);
322 #endif
323 }
324
325 /*
326 * Handle a BOOTP received packet.
327 */
328 static void
329 BootpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
330 unsigned len)
331 {
332 struct Bootp_t *bp;
333
334 debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n",
335 src, dest, len, sizeof(struct Bootp_t));
336
337 bp = (struct Bootp_t *)pkt;
338
339 /* Filter out pkts we don't want */
340 if (BootpCheckPkt(pkt, dest, src, len))
341 return;
342
343 /*
344 * Got a good BOOTP reply. Copy the data into our variables.
345 */
346 #ifdef CONFIG_STATUS_LED
347 status_led_set(STATUS_LED_BOOT, STATUS_LED_OFF);
348 #endif
349
350 BootpCopyNetParams(bp); /* Store net parameters from reply */
351
352 /* Retrieve extended information (we must parse the vendor area) */
353 if (NetReadLong((ulong *)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
354 BootpVendorProcess((uchar *)&bp->bp_vend[4], len);
355
356 NetSetTimeout(0, (thand_f *)0);
357 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop");
358
359 debug("Got good BOOTP\n");
360
361 net_auto_load();
362 }
363 #endif
364
365 /*
366 * Timeout on BOOTP/DHCP request.
367 */
368 static void
369 BootpTimeout(void)
370 {
371 ulong time_taken = get_timer(bootp_start);
372
373 if (time_taken >= TIMEOUT_MS) {
374 #ifdef CONFIG_BOOTP_MAY_FAIL
375 puts("\nRetry time exceeded\n");
376 net_set_state(NETLOOP_FAIL);
377 #else
378 puts("\nRetry time exceeded; starting again\n");
379 NetStartAgain();
380 #endif
381 } else {
382 bootp_timeout *= 2;
383 if (bootp_timeout > 2000)
384 bootp_timeout = 2000;
385 NetSetTimeout(bootp_timeout, BootpTimeout);
386 BootpRequest();
387 }
388 }
389
390 #define put_vci(e, str) \
391 do { \
392 size_t vci_strlen = strlen(str); \
393 *e++ = 60; /* Vendor Class Identifier */ \
394 *e++ = vci_strlen; \
395 memcpy(e, str, vci_strlen); \
396 e += vci_strlen; \
397 } while (0)
398
399 /*
400 * Initialize BOOTP extension fields in the request.
401 */
402 #if defined(CONFIG_CMD_DHCP)
403 static int DhcpExtended(u8 *e, int message_type, IPaddr_t ServerID,
404 IPaddr_t RequestedIP)
405 {
406 u8 *start = e;
407 u8 *cnt;
408 #if defined(CONFIG_BOOTP_PXE)
409 char *uuid;
410 u16 clientarch;
411 #endif
412
413 #if defined(CONFIG_BOOTP_VENDOREX)
414 u8 *x;
415 #endif
416 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
417 char *hostname;
418 #endif
419
420 *e++ = 99; /* RFC1048 Magic Cookie */
421 *e++ = 130;
422 *e++ = 83;
423 *e++ = 99;
424
425 *e++ = 53; /* DHCP Message Type */
426 *e++ = 1;
427 *e++ = message_type;
428
429 *e++ = 57; /* Maximum DHCP Message Size */
430 *e++ = 2;
431 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 8;
432 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
433
434 if (ServerID) {
435 int tmp = ntohl(ServerID);
436
437 *e++ = 54; /* ServerID */
438 *e++ = 4;
439 *e++ = tmp >> 24;
440 *e++ = tmp >> 16;
441 *e++ = tmp >> 8;
442 *e++ = tmp & 0xff;
443 }
444
445 if (RequestedIP) {
446 int tmp = ntohl(RequestedIP);
447
448 *e++ = 50; /* Requested IP */
449 *e++ = 4;
450 *e++ = tmp >> 24;
451 *e++ = tmp >> 16;
452 *e++ = tmp >> 8;
453 *e++ = tmp & 0xff;
454 }
455 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
456 hostname = getenv("hostname");
457 if (hostname) {
458 int hostnamelen = strlen(hostname);
459
460 *e++ = 12; /* Hostname */
461 *e++ = hostnamelen;
462 memcpy(e, hostname, hostnamelen);
463 e += hostnamelen;
464 }
465 #endif
466
467 #if defined(CONFIG_BOOTP_PXE)
468 clientarch = CONFIG_BOOTP_PXE_CLIENTARCH;
469 *e++ = 93; /* Client System Architecture */
470 *e++ = 2;
471 *e++ = (clientarch >> 8) & 0xff;
472 *e++ = clientarch & 0xff;
473
474 *e++ = 94; /* Client Network Interface Identifier */
475 *e++ = 3;
476 *e++ = 1; /* type field for UNDI */
477 *e++ = 0; /* major revision */
478 *e++ = 0; /* minor revision */
479
480 uuid = getenv("pxeuuid");
481
482 if (uuid) {
483 if (uuid_str_valid(uuid)) {
484 *e++ = 97; /* Client Machine Identifier */
485 *e++ = 17;
486 *e++ = 0; /* type 0 - UUID */
487
488 uuid_str_to_bin(uuid, e, UUID_STR_FORMAT_STD);
489 e += 16;
490 } else {
491 printf("Invalid pxeuuid: %s\n", uuid);
492 }
493 }
494 #endif
495
496 #ifdef CONFIG_BOOTP_VCI_STRING
497 put_vci(e, CONFIG_BOOTP_VCI_STRING);
498 #endif
499
500 #if defined(CONFIG_BOOTP_VENDOREX)
501 x = dhcp_vendorex_prep(e);
502 if (x)
503 return x - start;
504 #endif
505
506 *e++ = 55; /* Parameter Request List */
507 cnt = e++; /* Pointer to count of requested items */
508 *cnt = 0;
509 #if defined(CONFIG_BOOTP_SUBNETMASK)
510 *e++ = 1; /* Subnet Mask */
511 *cnt += 1;
512 #endif
513 #if defined(CONFIG_BOOTP_TIMEOFFSET)
514 *e++ = 2;
515 *cnt += 1;
516 #endif
517 #if defined(CONFIG_BOOTP_GATEWAY)
518 *e++ = 3; /* Router Option */
519 *cnt += 1;
520 #endif
521 #if defined(CONFIG_BOOTP_DNS)
522 *e++ = 6; /* DNS Server(s) */
523 *cnt += 1;
524 #endif
525 #if defined(CONFIG_BOOTP_HOSTNAME)
526 *e++ = 12; /* Hostname */
527 *cnt += 1;
528 #endif
529 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
530 *e++ = 13; /* Boot File Size */
531 *cnt += 1;
532 #endif
533 #if defined(CONFIG_BOOTP_BOOTPATH)
534 *e++ = 17; /* Boot path */
535 *cnt += 1;
536 #endif
537 #if defined(CONFIG_BOOTP_NISDOMAIN)
538 *e++ = 40; /* NIS Domain name request */
539 *cnt += 1;
540 #endif
541 #if defined(CONFIG_BOOTP_NTPSERVER)
542 *e++ = 42;
543 *cnt += 1;
544 #endif
545 /* no options, so back up to avoid sending an empty request list */
546 if (*cnt == 0)
547 e -= 2;
548
549 *e++ = 255; /* End of the list */
550
551 /* Pad to minimal length */
552 #ifdef CONFIG_DHCP_MIN_EXT_LEN
553 while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN)
554 *e++ = 0;
555 #endif
556
557 return e - start;
558 }
559
560 #else
561 /*
562 * Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
563 */
564 static int BootpExtended(u8 *e)
565 {
566 u8 *start = e;
567
568 *e++ = 99; /* RFC1048 Magic Cookie */
569 *e++ = 130;
570 *e++ = 83;
571 *e++ = 99;
572
573 #if defined(CONFIG_CMD_DHCP)
574 *e++ = 53; /* DHCP Message Type */
575 *e++ = 1;
576 *e++ = DHCP_DISCOVER;
577
578 *e++ = 57; /* Maximum DHCP Message Size */
579 *e++ = 2;
580 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 16;
581 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
582 #endif
583
584 #if defined(CONFIG_BOOTP_VCI_STRING) || \
585 (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING))
586 #ifdef CONFIG_SPL_BUILD
587 put_vci(e, CONFIG_SPL_NET_VCI_STRING);
588 #else
589 put_vci(e, CONFIG_BOOTP_VCI_STRING);
590 #endif
591 #endif
592
593 #if defined(CONFIG_BOOTP_SUBNETMASK)
594 *e++ = 1; /* Subnet mask request */
595 *e++ = 4;
596 e += 4;
597 #endif
598
599 #if defined(CONFIG_BOOTP_GATEWAY)
600 *e++ = 3; /* Default gateway request */
601 *e++ = 4;
602 e += 4;
603 #endif
604
605 #if defined(CONFIG_BOOTP_DNS)
606 *e++ = 6; /* Domain Name Server */
607 *e++ = 4;
608 e += 4;
609 #endif
610
611 #if defined(CONFIG_BOOTP_HOSTNAME)
612 *e++ = 12; /* Host name request */
613 *e++ = 32;
614 e += 32;
615 #endif
616
617 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
618 *e++ = 13; /* Boot file size */
619 *e++ = 2;
620 e += 2;
621 #endif
622
623 #if defined(CONFIG_BOOTP_BOOTPATH)
624 *e++ = 17; /* Boot path */
625 *e++ = 32;
626 e += 32;
627 #endif
628
629 #if defined(CONFIG_BOOTP_NISDOMAIN)
630 *e++ = 40; /* NIS Domain name request */
631 *e++ = 32;
632 e += 32;
633 #endif
634 #if defined(CONFIG_BOOTP_NTPSERVER)
635 *e++ = 42;
636 *e++ = 4;
637 e += 4;
638 #endif
639
640 *e++ = 255; /* End of the list */
641
642 return e - start;
643 }
644 #endif
645
646 void BootpReset(void)
647 {
648 bootp_num_ids = 0;
649 BootpTry = 0;
650 bootp_start = get_timer(0);
651 bootp_timeout = 250;
652 }
653
654 void
655 BootpRequest(void)
656 {
657 uchar *pkt, *iphdr;
658 struct Bootp_t *bp;
659 int extlen, pktlen, iplen;
660 int eth_hdr_size;
661 #ifdef CONFIG_BOOTP_RANDOM_DELAY
662 ulong rand_ms;
663 #endif
664 ulong BootpID;
665
666 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start");
667 #if defined(CONFIG_CMD_DHCP)
668 dhcp_state = INIT;
669 #endif
670
671 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */
672 if (BootpTry == 0)
673 srand_mac();
674
675 if (BootpTry <= 2) /* Start with max 1024 * 1ms */
676 rand_ms = rand() >> (22 - BootpTry);
677 else /* After 3rd BOOTP request max 8192 * 1ms */
678 rand_ms = rand() >> 19;
679
680 printf("Random delay: %ld ms...\n", rand_ms);
681 mdelay(rand_ms);
682
683 #endif /* CONFIG_BOOTP_RANDOM_DELAY */
684
685 printf("BOOTP broadcast %d\n", ++BootpTry);
686 pkt = NetTxPacket;
687 memset((void *)pkt, 0, PKTSIZE);
688
689 eth_hdr_size = NetSetEther(pkt, NetBcastAddr, PROT_IP);
690 pkt += eth_hdr_size;
691
692 /*
693 * Next line results in incorrect packet size being transmitted,
694 * resulting in errors in some DHCP servers, reporting missing bytes.
695 * Size must be set in packet header after extension length has been
696 * determined.
697 * C. Hallinan, DS4.COM, Inc.
698 */
699 /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC,
700 sizeof (struct Bootp_t)); */
701 iphdr = pkt; /* We need this later for net_set_udp_header() */
702 pkt += IP_UDP_HDR_SIZE;
703
704 bp = (struct Bootp_t *)pkt;
705 bp->bp_op = OP_BOOTREQUEST;
706 bp->bp_htype = HWT_ETHER;
707 bp->bp_hlen = HWL_ETHER;
708 bp->bp_hops = 0;
709 bp->bp_secs = htons(get_timer(0) / 1000);
710 NetWriteIP(&bp->bp_ciaddr, 0);
711 NetWriteIP(&bp->bp_yiaddr, 0);
712 NetWriteIP(&bp->bp_siaddr, 0);
713 NetWriteIP(&bp->bp_giaddr, 0);
714 memcpy(bp->bp_chaddr, NetOurEther, 6);
715 copy_filename(bp->bp_file, BootFile, sizeof(bp->bp_file));
716
717 /* Request additional information from the BOOTP/DHCP server */
718 #if defined(CONFIG_CMD_DHCP)
719 extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0);
720 #else
721 extlen = BootpExtended((u8 *)bp->bp_vend);
722 #endif
723
724 /*
725 * Bootp ID is the lower 4 bytes of our ethernet address
726 * plus the current time in ms.
727 */
728 BootpID = ((ulong)NetOurEther[2] << 24)
729 | ((ulong)NetOurEther[3] << 16)
730 | ((ulong)NetOurEther[4] << 8)
731 | (ulong)NetOurEther[5];
732 BootpID += get_timer(0);
733 BootpID = htonl(BootpID);
734 bootp_add_id(BootpID);
735 NetCopyLong(&bp->bp_id, &BootpID);
736
737 /*
738 * Calculate proper packet lengths taking into account the
739 * variable size of the options field
740 */
741 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
742 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
743 net_set_udp_header(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
744 NetSetTimeout(bootp_timeout, BootpTimeout);
745
746 #if defined(CONFIG_CMD_DHCP)
747 dhcp_state = SELECTING;
748 net_set_udp_handler(DhcpHandler);
749 #else
750 net_set_udp_handler(BootpHandler);
751 #endif
752 NetSendPacket(NetTxPacket, pktlen);
753 }
754
755 #if defined(CONFIG_CMD_DHCP)
756 static void DhcpOptionsProcess(uchar *popt, struct Bootp_t *bp)
757 {
758 uchar *end = popt + BOOTP_HDR_SIZE;
759 int oplen, size;
760 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
761 int *to_ptr;
762 #endif
763
764 while (popt < end && *popt != 0xff) {
765 oplen = *(popt + 1);
766 switch (*popt) {
767 case 1:
768 NetCopyIP(&NetOurSubnetMask, (popt + 2));
769 break;
770 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
771 case 2: /* Time offset */
772 to_ptr = &NetTimeOffset;
773 NetCopyLong((ulong *)to_ptr, (ulong *)(popt + 2));
774 NetTimeOffset = ntohl(NetTimeOffset);
775 break;
776 #endif
777 case 3:
778 NetCopyIP(&NetOurGatewayIP, (popt + 2));
779 break;
780 case 6:
781 NetCopyIP(&NetOurDNSIP, (popt + 2));
782 #if defined(CONFIG_BOOTP_DNS2)
783 if (*(popt + 1) > 4)
784 NetCopyIP(&NetOurDNS2IP, (popt + 2 + 4));
785 #endif
786 break;
787 case 12:
788 size = truncate_sz("Host Name",
789 sizeof(NetOurHostName), oplen);
790 memcpy(&NetOurHostName, popt + 2, size);
791 NetOurHostName[size] = 0;
792 break;
793 case 15: /* Ignore Domain Name Option */
794 break;
795 case 17:
796 size = truncate_sz("Root Path",
797 sizeof(NetOurRootPath), oplen);
798 memcpy(&NetOurRootPath, popt + 2, size);
799 NetOurRootPath[size] = 0;
800 break;
801 case 28: /* Ignore Broadcast Address Option */
802 break;
803 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
804 case 42: /* NTP server IP */
805 NetCopyIP(&NetNtpServerIP, (popt + 2));
806 break;
807 #endif
808 case 51:
809 NetCopyLong(&dhcp_leasetime, (ulong *) (popt + 2));
810 break;
811 case 53: /* Ignore Message Type Option */
812 break;
813 case 54:
814 NetCopyIP(&NetDHCPServerIP, (popt + 2));
815 break;
816 case 58: /* Ignore Renewal Time Option */
817 break;
818 case 59: /* Ignore Rebinding Time Option */
819 break;
820 case 66: /* Ignore TFTP server name */
821 break;
822 case 67: /* vendor opt bootfile */
823 /*
824 * I can't use dhcp_vendorex_proc here because I need
825 * to write into the bootp packet - even then I had to
826 * pass the bootp packet pointer into here as the
827 * second arg
828 */
829 size = truncate_sz("Opt Boot File",
830 sizeof(bp->bp_file),
831 oplen);
832 if (bp->bp_file[0] == '\0' && size > 0) {
833 /*
834 * only use vendor boot file if we didn't
835 * receive a boot file in the main non-vendor
836 * part of the packet - god only knows why
837 * some vendors chose not to use this perfectly
838 * good spot to store the boot file (join on
839 * Tru64 Unix) it seems mind bogglingly crazy
840 * to me
841 */
842 printf("*** WARNING: using vendor "
843 "optional boot file\n");
844 memcpy(bp->bp_file, popt + 2, size);
845 bp->bp_file[size] = '\0';
846 }
847 break;
848 default:
849 #if defined(CONFIG_BOOTP_VENDOREX)
850 if (dhcp_vendorex_proc(popt))
851 break;
852 #endif
853 printf("*** Unhandled DHCP Option in OFFER/ACK:"
854 " %d\n", *popt);
855 break;
856 }
857 popt += oplen + 2; /* Process next option */
858 }
859 }
860
861 static int DhcpMessageType(unsigned char *popt)
862 {
863 if (NetReadLong((ulong *)popt) != htonl(BOOTP_VENDOR_MAGIC))
864 return -1;
865
866 popt += 4;
867 while (*popt != 0xff) {
868 if (*popt == 53) /* DHCP Message Type */
869 return *(popt + 2);
870 popt += *(popt + 1) + 2; /* Scan through all options */
871 }
872 return -1;
873 }
874
875 static void DhcpSendRequestPkt(struct Bootp_t *bp_offer)
876 {
877 uchar *pkt, *iphdr;
878 struct Bootp_t *bp;
879 int pktlen, iplen, extlen;
880 int eth_hdr_size;
881 IPaddr_t OfferedIP;
882
883 debug("DhcpSendRequestPkt: Sending DHCPREQUEST\n");
884 pkt = NetTxPacket;
885 memset((void *)pkt, 0, PKTSIZE);
886
887 eth_hdr_size = NetSetEther(pkt, NetBcastAddr, PROT_IP);
888 pkt += eth_hdr_size;
889
890 iphdr = pkt; /* We'll need this later to set proper pkt size */
891 pkt += IP_UDP_HDR_SIZE;
892
893 bp = (struct Bootp_t *)pkt;
894 bp->bp_op = OP_BOOTREQUEST;
895 bp->bp_htype = HWT_ETHER;
896 bp->bp_hlen = HWL_ETHER;
897 bp->bp_hops = 0;
898 bp->bp_secs = htons(get_timer(0) / 1000);
899 /* Do not set the client IP, your IP, or server IP yet, since it
900 * hasn't been ACK'ed by the server yet */
901
902 /*
903 * RFC3046 requires Relay Agents to discard packets with
904 * nonzero and offered giaddr
905 */
906 NetWriteIP(&bp->bp_giaddr, 0);
907
908 memcpy(bp->bp_chaddr, NetOurEther, 6);
909
910 /*
911 * ID is the id of the OFFER packet
912 */
913
914 NetCopyLong(&bp->bp_id, &bp_offer->bp_id);
915
916 /*
917 * Copy options from OFFER packet if present
918 */
919
920 /* Copy offered IP into the parameters request list */
921 NetCopyIP(&OfferedIP, &bp_offer->bp_yiaddr);
922 extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_REQUEST,
923 NetDHCPServerIP, OfferedIP);
924
925 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
926 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
927 net_set_udp_header(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
928
929 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
930 udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
931 #endif /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
932 debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
933 NetSendPacket(NetTxPacket, pktlen);
934 }
935
936 /*
937 * Handle DHCP received packets.
938 */
939 static void
940 DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
941 unsigned len)
942 {
943 struct Bootp_t *bp = (struct Bootp_t *)pkt;
944
945 debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
946 src, dest, len, dhcp_state);
947
948 /* Filter out pkts we don't want */
949 if (BootpCheckPkt(pkt, dest, src, len))
950 return;
951
952 debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state:"
953 " %d\n", src, dest, len, dhcp_state);
954
955 switch (dhcp_state) {
956 case SELECTING:
957 /*
958 * Wait an appropriate time for any potential DHCPOFFER packets
959 * to arrive. Then select one, and generate DHCPREQUEST
960 * response. If filename is in format we recognize, assume it
961 * is a valid OFFER from a server we want.
962 */
963 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
964 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
965 if (strncmp(bp->bp_file,
966 CONFIG_SYS_BOOTFILE_PREFIX,
967 strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) {
968 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */
969
970 debug("TRANSITIONING TO REQUESTING STATE\n");
971 dhcp_state = REQUESTING;
972
973 if (NetReadLong((ulong *)&bp->bp_vend[0]) ==
974 htonl(BOOTP_VENDOR_MAGIC))
975 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
976
977 NetSetTimeout(5000, BootpTimeout);
978 DhcpSendRequestPkt(bp);
979 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
980 }
981 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */
982
983 return;
984 break;
985 case REQUESTING:
986 debug("DHCP State: REQUESTING\n");
987
988 if (DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK) {
989 if (NetReadLong((ulong *)&bp->bp_vend[0]) ==
990 htonl(BOOTP_VENDOR_MAGIC))
991 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
992 /* Store net params from reply */
993 BootpCopyNetParams(bp);
994 dhcp_state = BOUND;
995 printf("DHCP client bound to address %pI4 (%lu ms)\n",
996 &NetOurIP, get_timer(bootp_start));
997 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP,
998 "bootp_stop");
999
1000 net_auto_load();
1001 return;
1002 }
1003 break;
1004 case BOUND:
1005 /* DHCP client bound to address */
1006 break;
1007 default:
1008 puts("DHCP: INVALID STATE\n");
1009 break;
1010 }
1011
1012 }
1013
1014 void DhcpRequest(void)
1015 {
1016 BootpRequest();
1017 }
1018 #endif /* CONFIG_CMD_DHCP */
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