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[thirdparty/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 struct in_addr dhcp_server_ip;
64 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
65 unsigned src, 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 struct in_addr tmp_ip;
143
144 net_copy_ip(&tmp_ip, &bp->bp_siaddr);
145 if (tmp_ip.s_addr != 0)
146 net_copy_ip(&net_server_ip, &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 net_copy_ip(&net_ip, &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 (net_netmask.s_addr == 0)
188 net_copy_ip(&net_netmask, (struct in_addr *)(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 (net_gateway.s_addr == 0)
195 net_copy_ip(&net_gateway, (struct in_addr *)(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 (net_dns_server.s_addr == 0)
203 net_copy_ip(&net_dns_server,
204 (struct in_addr *)(ext + 2));
205 #if defined(CONFIG_BOOTP_DNS2)
206 if ((net_dns_server2.s_addr == 0) && (size > 4))
207 net_copy_ip(&net_dns_server2,
208 (struct in_addr *)(ext + 2 + 4));
209 #endif
210 break;
211 case 7: /* Log server - Not yet supported */
212 break;
213 case 8: /* Cookie/Quote server - Not yet supported */
214 break;
215 case 9: /* LPR server - Not yet supported */
216 break;
217 case 10: /* Impress server - Not yet supported */
218 break;
219 case 11: /* RPL server - Not yet supported */
220 break;
221 case 12: /* Host name */
222 if (NetOurHostName[0] == 0) {
223 size = truncate_sz("Host Name",
224 sizeof(NetOurHostName), size);
225 memcpy(&NetOurHostName, ext + 2, size);
226 NetOurHostName[size] = 0;
227 }
228 break;
229 case 13: /* Boot file size */
230 if (size == 2)
231 NetBootFileSize = ntohs(*(ushort *) (ext + 2));
232 else if (size == 4)
233 NetBootFileSize = ntohl(*(ulong *) (ext + 2));
234 break;
235 case 14: /* Merit dump file - Not yet supported */
236 break;
237 case 15: /* Domain name - Not yet supported */
238 break;
239 case 16: /* Swap server - Not yet supported */
240 break;
241 case 17: /* Root path */
242 if (NetOurRootPath[0] == 0) {
243 size = truncate_sz("Root Path",
244 sizeof(NetOurRootPath), size);
245 memcpy(&NetOurRootPath, ext + 2, size);
246 NetOurRootPath[size] = 0;
247 }
248 break;
249 case 18: /* Extension path - Not yet supported */
250 /*
251 * This can be used to send the information of the
252 * vendor area in another file that the client can
253 * access via TFTP.
254 */
255 break;
256 /* IP host layer fields */
257 case 40: /* NIS Domain name */
258 if (NetOurNISDomain[0] == 0) {
259 size = truncate_sz("NIS Domain Name",
260 sizeof(NetOurNISDomain), size);
261 memcpy(&NetOurNISDomain, ext + 2, size);
262 NetOurNISDomain[size] = 0;
263 }
264 break;
265 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
266 case 42: /* NTP server IP */
267 net_copy_ip(&net_ntp_server, (struct in_addr *)(ext + 2));
268 break;
269 #endif
270 /* Application layer fields */
271 case 43: /* Vendor specific info - Not yet supported */
272 /*
273 * Binary information to exchange specific
274 * product information.
275 */
276 break;
277 /* Reserved (custom) fields (128..254) */
278 }
279 }
280
281 static void BootpVendorProcess(u8 *ext, int size)
282 {
283 u8 *end = ext + size;
284
285 debug("[BOOTP] Checking extension (%d bytes)...\n", size);
286
287 while ((ext < end) && (*ext != 0xff)) {
288 if (*ext == 0) {
289 ext++;
290 } else {
291 u8 *opt = ext;
292
293 ext += ext[1] + 2;
294 if (ext <= end)
295 BootpVendorFieldProcess(opt);
296 }
297 }
298
299 debug("[BOOTP] Received fields:\n");
300 if (net_netmask.s_addr)
301 debug("net_netmask : %pI4\n", &net_netmask);
302
303 if (net_gateway.s_addr)
304 debug("net_gateway : %pI4", &net_gateway);
305
306 if (NetBootFileSize)
307 debug("NetBootFileSize : %d\n", NetBootFileSize);
308
309 if (NetOurHostName[0])
310 debug("NetOurHostName : %s\n", NetOurHostName);
311
312 if (NetOurRootPath[0])
313 debug("NetOurRootPath : %s\n", NetOurRootPath);
314
315 if (NetOurNISDomain[0])
316 debug("NetOurNISDomain : %s\n", NetOurNISDomain);
317
318 if (NetBootFileSize)
319 debug("NetBootFileSize: %d\n", NetBootFileSize);
320
321 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
322 if (net_ntp_server)
323 debug("net_ntp_server : %pI4\n", &net_ntp_server);
324 #endif
325 }
326
327 /*
328 * Handle a BOOTP received packet.
329 */
330 static void bootp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
331 unsigned src, unsigned len)
332 {
333 struct Bootp_t *bp;
334
335 debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n",
336 src, dest, len, sizeof(struct Bootp_t));
337
338 bp = (struct Bootp_t *)pkt;
339
340 /* Filter out pkts we don't want */
341 if (BootpCheckPkt(pkt, dest, src, len))
342 return;
343
344 /*
345 * Got a good BOOTP reply. Copy the data into our variables.
346 */
347 #ifdef CONFIG_STATUS_LED
348 status_led_set(STATUS_LED_BOOT, STATUS_LED_OFF);
349 #endif
350
351 BootpCopyNetParams(bp); /* Store net parameters from reply */
352
353 /* Retrieve extended information (we must parse the vendor area) */
354 if (NetReadLong((ulong *)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
355 BootpVendorProcess((uchar *)&bp->bp_vend[4], len);
356
357 NetSetTimeout(0, (thand_f *)0);
358 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop");
359
360 debug("Got good BOOTP\n");
361
362 net_auto_load();
363 }
364 #endif
365
366 /*
367 * Timeout on BOOTP/DHCP request.
368 */
369 static void
370 BootpTimeout(void)
371 {
372 ulong time_taken = get_timer(bootp_start);
373
374 if (time_taken >= TIMEOUT_MS) {
375 #ifdef CONFIG_BOOTP_MAY_FAIL
376 puts("\nRetry time exceeded\n");
377 net_set_state(NETLOOP_FAIL);
378 #else
379 puts("\nRetry time exceeded; starting again\n");
380 NetStartAgain();
381 #endif
382 } else {
383 bootp_timeout *= 2;
384 if (bootp_timeout > 2000)
385 bootp_timeout = 2000;
386 NetSetTimeout(bootp_timeout, BootpTimeout);
387 BootpRequest();
388 }
389 }
390
391 #define put_vci(e, str) \
392 do { \
393 size_t vci_strlen = strlen(str); \
394 *e++ = 60; /* Vendor Class Identifier */ \
395 *e++ = vci_strlen; \
396 memcpy(e, str, vci_strlen); \
397 e += vci_strlen; \
398 } while (0)
399
400 /*
401 * Initialize BOOTP extension fields in the request.
402 */
403 #if defined(CONFIG_CMD_DHCP)
404 static int dhcp_extended(u8 *e, int message_type, struct in_addr server_ip,
405 struct in_addr requested_ip)
406 {
407 u8 *start = e;
408 u8 *cnt;
409 #if defined(CONFIG_BOOTP_PXE)
410 char *uuid;
411 u16 clientarch;
412 #endif
413
414 #if defined(CONFIG_BOOTP_VENDOREX)
415 u8 *x;
416 #endif
417 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
418 char *hostname;
419 #endif
420
421 *e++ = 99; /* RFC1048 Magic Cookie */
422 *e++ = 130;
423 *e++ = 83;
424 *e++ = 99;
425
426 *e++ = 53; /* DHCP Message Type */
427 *e++ = 1;
428 *e++ = message_type;
429
430 *e++ = 57; /* Maximum DHCP Message Size */
431 *e++ = 2;
432 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 8;
433 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
434
435 if (server_ip.s_addr) {
436 int tmp = ntohl(server_ip.s_addr);
437
438 *e++ = 54; /* ServerID */
439 *e++ = 4;
440 *e++ = tmp >> 24;
441 *e++ = tmp >> 16;
442 *e++ = tmp >> 8;
443 *e++ = tmp & 0xff;
444 }
445
446 if (requested_ip.s_addr) {
447 int tmp = ntohl(requested_ip.s_addr);
448
449 *e++ = 50; /* Requested IP */
450 *e++ = 4;
451 *e++ = tmp >> 24;
452 *e++ = tmp >> 16;
453 *e++ = tmp >> 8;
454 *e++ = tmp & 0xff;
455 }
456 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
457 hostname = getenv("hostname");
458 if (hostname) {
459 int hostnamelen = strlen(hostname);
460
461 *e++ = 12; /* Hostname */
462 *e++ = hostnamelen;
463 memcpy(e, hostname, hostnamelen);
464 e += hostnamelen;
465 }
466 #endif
467
468 #if defined(CONFIG_BOOTP_PXE)
469 clientarch = CONFIG_BOOTP_PXE_CLIENTARCH;
470 *e++ = 93; /* Client System Architecture */
471 *e++ = 2;
472 *e++ = (clientarch >> 8) & 0xff;
473 *e++ = clientarch & 0xff;
474
475 *e++ = 94; /* Client Network Interface Identifier */
476 *e++ = 3;
477 *e++ = 1; /* type field for UNDI */
478 *e++ = 0; /* major revision */
479 *e++ = 0; /* minor revision */
480
481 uuid = getenv("pxeuuid");
482
483 if (uuid) {
484 if (uuid_str_valid(uuid)) {
485 *e++ = 97; /* Client Machine Identifier */
486 *e++ = 17;
487 *e++ = 0; /* type 0 - UUID */
488
489 uuid_str_to_bin(uuid, e, UUID_STR_FORMAT_STD);
490 e += 16;
491 } else {
492 printf("Invalid pxeuuid: %s\n", uuid);
493 }
494 }
495 #endif
496
497 #ifdef CONFIG_BOOTP_VCI_STRING
498 put_vci(e, CONFIG_BOOTP_VCI_STRING);
499 #endif
500
501 #if defined(CONFIG_BOOTP_VENDOREX)
502 x = dhcp_vendorex_prep(e);
503 if (x)
504 return x - start;
505 #endif
506
507 *e++ = 55; /* Parameter Request List */
508 cnt = e++; /* Pointer to count of requested items */
509 *cnt = 0;
510 #if defined(CONFIG_BOOTP_SUBNETMASK)
511 *e++ = 1; /* Subnet Mask */
512 *cnt += 1;
513 #endif
514 #if defined(CONFIG_BOOTP_TIMEOFFSET)
515 *e++ = 2;
516 *cnt += 1;
517 #endif
518 #if defined(CONFIG_BOOTP_GATEWAY)
519 *e++ = 3; /* Router Option */
520 *cnt += 1;
521 #endif
522 #if defined(CONFIG_BOOTP_DNS)
523 *e++ = 6; /* DNS Server(s) */
524 *cnt += 1;
525 #endif
526 #if defined(CONFIG_BOOTP_HOSTNAME)
527 *e++ = 12; /* Hostname */
528 *cnt += 1;
529 #endif
530 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
531 *e++ = 13; /* Boot File Size */
532 *cnt += 1;
533 #endif
534 #if defined(CONFIG_BOOTP_BOOTPATH)
535 *e++ = 17; /* Boot path */
536 *cnt += 1;
537 #endif
538 #if defined(CONFIG_BOOTP_NISDOMAIN)
539 *e++ = 40; /* NIS Domain name request */
540 *cnt += 1;
541 #endif
542 #if defined(CONFIG_BOOTP_NTPSERVER)
543 *e++ = 42;
544 *cnt += 1;
545 #endif
546 /* no options, so back up to avoid sending an empty request list */
547 if (*cnt == 0)
548 e -= 2;
549
550 *e++ = 255; /* End of the list */
551
552 /* Pad to minimal length */
553 #ifdef CONFIG_DHCP_MIN_EXT_LEN
554 while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN)
555 *e++ = 0;
556 #endif
557
558 return e - start;
559 }
560
561 #else
562 /*
563 * Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
564 */
565 static int bootp_extended(u8 *e)
566 {
567 u8 *start = e;
568
569 *e++ = 99; /* RFC1048 Magic Cookie */
570 *e++ = 130;
571 *e++ = 83;
572 *e++ = 99;
573
574 #if defined(CONFIG_CMD_DHCP)
575 *e++ = 53; /* DHCP Message Type */
576 *e++ = 1;
577 *e++ = DHCP_DISCOVER;
578
579 *e++ = 57; /* Maximum DHCP Message Size */
580 *e++ = 2;
581 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 16;
582 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
583 #endif
584
585 #if defined(CONFIG_BOOTP_VCI_STRING) || \
586 (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING))
587 #ifdef CONFIG_SPL_BUILD
588 put_vci(e, CONFIG_SPL_NET_VCI_STRING);
589 #else
590 put_vci(e, CONFIG_BOOTP_VCI_STRING);
591 #endif
592 #endif
593
594 #if defined(CONFIG_BOOTP_SUBNETMASK)
595 *e++ = 1; /* Subnet mask request */
596 *e++ = 4;
597 e += 4;
598 #endif
599
600 #if defined(CONFIG_BOOTP_GATEWAY)
601 *e++ = 3; /* Default gateway request */
602 *e++ = 4;
603 e += 4;
604 #endif
605
606 #if defined(CONFIG_BOOTP_DNS)
607 *e++ = 6; /* Domain Name Server */
608 *e++ = 4;
609 e += 4;
610 #endif
611
612 #if defined(CONFIG_BOOTP_HOSTNAME)
613 *e++ = 12; /* Host name request */
614 *e++ = 32;
615 e += 32;
616 #endif
617
618 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
619 *e++ = 13; /* Boot file size */
620 *e++ = 2;
621 e += 2;
622 #endif
623
624 #if defined(CONFIG_BOOTP_BOOTPATH)
625 *e++ = 17; /* Boot path */
626 *e++ = 32;
627 e += 32;
628 #endif
629
630 #if defined(CONFIG_BOOTP_NISDOMAIN)
631 *e++ = 40; /* NIS Domain name request */
632 *e++ = 32;
633 e += 32;
634 #endif
635 #if defined(CONFIG_BOOTP_NTPSERVER)
636 *e++ = 42;
637 *e++ = 4;
638 e += 4;
639 #endif
640
641 *e++ = 255; /* End of the list */
642
643 return e - start;
644 }
645 #endif
646
647 void BootpReset(void)
648 {
649 bootp_num_ids = 0;
650 BootpTry = 0;
651 bootp_start = get_timer(0);
652 bootp_timeout = 250;
653 }
654
655 void
656 BootpRequest(void)
657 {
658 uchar *pkt, *iphdr;
659 struct Bootp_t *bp;
660 int extlen, pktlen, iplen;
661 int eth_hdr_size;
662 #ifdef CONFIG_BOOTP_RANDOM_DELAY
663 ulong rand_ms;
664 #endif
665 ulong BootpID;
666 struct in_addr zero_ip;
667 struct in_addr bcast_ip;
668
669 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start");
670 #if defined(CONFIG_CMD_DHCP)
671 dhcp_state = INIT;
672 #endif
673
674 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */
675 if (BootpTry == 0)
676 srand_mac();
677
678 if (BootpTry <= 2) /* Start with max 1024 * 1ms */
679 rand_ms = rand() >> (22 - BootpTry);
680 else /* After 3rd BOOTP request max 8192 * 1ms */
681 rand_ms = rand() >> 19;
682
683 printf("Random delay: %ld ms...\n", rand_ms);
684 mdelay(rand_ms);
685
686 #endif /* CONFIG_BOOTP_RANDOM_DELAY */
687
688 printf("BOOTP broadcast %d\n", ++BootpTry);
689 pkt = NetTxPacket;
690 memset((void *)pkt, 0, PKTSIZE);
691
692 eth_hdr_size = NetSetEther(pkt, NetBcastAddr, PROT_IP);
693 pkt += eth_hdr_size;
694
695 /*
696 * Next line results in incorrect packet size being transmitted,
697 * resulting in errors in some DHCP servers, reporting missing bytes.
698 * Size must be set in packet header after extension length has been
699 * determined.
700 * C. Hallinan, DS4.COM, Inc.
701 */
702 /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC,
703 sizeof (struct Bootp_t)); */
704 iphdr = pkt; /* We need this later for net_set_udp_header() */
705 pkt += IP_UDP_HDR_SIZE;
706
707 bp = (struct Bootp_t *)pkt;
708 bp->bp_op = OP_BOOTREQUEST;
709 bp->bp_htype = HWT_ETHER;
710 bp->bp_hlen = HWL_ETHER;
711 bp->bp_hops = 0;
712 bp->bp_secs = htons(get_timer(0) / 1000);
713 zero_ip.s_addr = 0;
714 net_write_ip(&bp->bp_ciaddr, zero_ip);
715 net_write_ip(&bp->bp_yiaddr, zero_ip);
716 net_write_ip(&bp->bp_siaddr, zero_ip);
717 net_write_ip(&bp->bp_giaddr, zero_ip);
718 memcpy(bp->bp_chaddr, NetOurEther, 6);
719 copy_filename(bp->bp_file, BootFile, sizeof(bp->bp_file));
720
721 /* Request additional information from the BOOTP/DHCP server */
722 #if defined(CONFIG_CMD_DHCP)
723 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_DISCOVER, zero_ip,
724 zero_ip);
725 #else
726 extlen = bootp_extended((u8 *)bp->bp_vend);
727 #endif
728
729 /*
730 * Bootp ID is the lower 4 bytes of our ethernet address
731 * plus the current time in ms.
732 */
733 BootpID = ((ulong)NetOurEther[2] << 24)
734 | ((ulong)NetOurEther[3] << 16)
735 | ((ulong)NetOurEther[4] << 8)
736 | (ulong)NetOurEther[5];
737 BootpID += get_timer(0);
738 BootpID = htonl(BootpID);
739 bootp_add_id(BootpID);
740 NetCopyLong(&bp->bp_id, &BootpID);
741
742 /*
743 * Calculate proper packet lengths taking into account the
744 * variable size of the options field
745 */
746 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
747 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
748 bcast_ip.s_addr = 0xFFFFFFFFL;
749 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
750 NetSetTimeout(bootp_timeout, BootpTimeout);
751
752 #if defined(CONFIG_CMD_DHCP)
753 dhcp_state = SELECTING;
754 net_set_udp_handler(dhcp_handler);
755 #else
756 net_set_udp_handler(bootp_handler);
757 #endif
758 NetSendPacket(NetTxPacket, pktlen);
759 }
760
761 #if defined(CONFIG_CMD_DHCP)
762 static void DhcpOptionsProcess(uchar *popt, struct Bootp_t *bp)
763 {
764 uchar *end = popt + BOOTP_HDR_SIZE;
765 int oplen, size;
766 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
767 int *to_ptr;
768 #endif
769
770 while (popt < end && *popt != 0xff) {
771 oplen = *(popt + 1);
772 switch (*popt) {
773 case 1:
774 net_copy_ip(&net_netmask, (popt + 2));
775 break;
776 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
777 case 2: /* Time offset */
778 to_ptr = &NetTimeOffset;
779 NetCopyLong((ulong *)to_ptr, (ulong *)(popt + 2));
780 NetTimeOffset = ntohl(NetTimeOffset);
781 break;
782 #endif
783 case 3:
784 net_copy_ip(&net_gateway, (popt + 2));
785 break;
786 case 6:
787 net_copy_ip(&net_dns_server, (popt + 2));
788 #if defined(CONFIG_BOOTP_DNS2)
789 if (*(popt + 1) > 4)
790 net_copy_ip(&net_dns_server2, (popt + 2 + 4));
791 #endif
792 break;
793 case 12:
794 size = truncate_sz("Host Name",
795 sizeof(NetOurHostName), oplen);
796 memcpy(&NetOurHostName, popt + 2, size);
797 NetOurHostName[size] = 0;
798 break;
799 case 15: /* Ignore Domain Name Option */
800 break;
801 case 17:
802 size = truncate_sz("Root Path",
803 sizeof(NetOurRootPath), oplen);
804 memcpy(&NetOurRootPath, popt + 2, size);
805 NetOurRootPath[size] = 0;
806 break;
807 case 28: /* Ignore Broadcast Address Option */
808 break;
809 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
810 case 42: /* NTP server IP */
811 net_copy_ip(&net_ntp_server, (popt + 2));
812 break;
813 #endif
814 case 51:
815 NetCopyLong(&dhcp_leasetime, (ulong *) (popt + 2));
816 break;
817 case 53: /* Ignore Message Type Option */
818 break;
819 case 54:
820 net_copy_ip(&dhcp_server_ip, (popt + 2));
821 break;
822 case 58: /* Ignore Renewal Time Option */
823 break;
824 case 59: /* Ignore Rebinding Time Option */
825 break;
826 case 66: /* Ignore TFTP server name */
827 break;
828 case 67: /* vendor opt bootfile */
829 /*
830 * I can't use dhcp_vendorex_proc here because I need
831 * to write into the bootp packet - even then I had to
832 * pass the bootp packet pointer into here as the
833 * second arg
834 */
835 size = truncate_sz("Opt Boot File",
836 sizeof(bp->bp_file),
837 oplen);
838 if (bp->bp_file[0] == '\0' && size > 0) {
839 /*
840 * only use vendor boot file if we didn't
841 * receive a boot file in the main non-vendor
842 * part of the packet - god only knows why
843 * some vendors chose not to use this perfectly
844 * good spot to store the boot file (join on
845 * Tru64 Unix) it seems mind bogglingly crazy
846 * to me
847 */
848 printf("*** WARNING: using vendor "
849 "optional boot file\n");
850 memcpy(bp->bp_file, popt + 2, size);
851 bp->bp_file[size] = '\0';
852 }
853 break;
854 default:
855 #if defined(CONFIG_BOOTP_VENDOREX)
856 if (dhcp_vendorex_proc(popt))
857 break;
858 #endif
859 printf("*** Unhandled DHCP Option in OFFER/ACK:"
860 " %d\n", *popt);
861 break;
862 }
863 popt += oplen + 2; /* Process next option */
864 }
865 }
866
867 static int DhcpMessageType(unsigned char *popt)
868 {
869 if (NetReadLong((ulong *)popt) != htonl(BOOTP_VENDOR_MAGIC))
870 return -1;
871
872 popt += 4;
873 while (*popt != 0xff) {
874 if (*popt == 53) /* DHCP Message Type */
875 return *(popt + 2);
876 popt += *(popt + 1) + 2; /* Scan through all options */
877 }
878 return -1;
879 }
880
881 static void DhcpSendRequestPkt(struct Bootp_t *bp_offer)
882 {
883 uchar *pkt, *iphdr;
884 struct Bootp_t *bp;
885 int pktlen, iplen, extlen;
886 int eth_hdr_size;
887 struct in_addr offered_ip;
888 struct in_addr zero_ip;
889 struct in_addr bcast_ip;
890
891 debug("DhcpSendRequestPkt: Sending DHCPREQUEST\n");
892 pkt = NetTxPacket;
893 memset((void *)pkt, 0, PKTSIZE);
894
895 eth_hdr_size = NetSetEther(pkt, NetBcastAddr, PROT_IP);
896 pkt += eth_hdr_size;
897
898 iphdr = pkt; /* We'll need this later to set proper pkt size */
899 pkt += IP_UDP_HDR_SIZE;
900
901 bp = (struct Bootp_t *)pkt;
902 bp->bp_op = OP_BOOTREQUEST;
903 bp->bp_htype = HWT_ETHER;
904 bp->bp_hlen = HWL_ETHER;
905 bp->bp_hops = 0;
906 bp->bp_secs = htons(get_timer(0) / 1000);
907 /* Do not set the client IP, your IP, or server IP yet, since it
908 * hasn't been ACK'ed by the server yet */
909
910 /*
911 * RFC3046 requires Relay Agents to discard packets with
912 * nonzero and offered giaddr
913 */
914 zero_ip.s_addr = 0;
915 net_write_ip(&bp->bp_giaddr, zero_ip);
916
917 memcpy(bp->bp_chaddr, NetOurEther, 6);
918
919 /*
920 * ID is the id of the OFFER packet
921 */
922
923 NetCopyLong(&bp->bp_id, &bp_offer->bp_id);
924
925 /*
926 * Copy options from OFFER packet if present
927 */
928
929 /* Copy offered IP into the parameters request list */
930 net_copy_ip(&offered_ip, &bp_offer->bp_yiaddr);
931 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST,
932 dhcp_server_ip, offered_ip);
933
934 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
935 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
936 bcast_ip.s_addr = 0xFFFFFFFFL;
937 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
938
939 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
940 udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
941 #endif /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
942 debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
943 NetSendPacket(NetTxPacket, pktlen);
944 }
945
946 /*
947 * Handle DHCP received packets.
948 */
949 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
950 unsigned src, unsigned len)
951 {
952 struct Bootp_t *bp = (struct Bootp_t *)pkt;
953
954 debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
955 src, dest, len, dhcp_state);
956
957 /* Filter out pkts we don't want */
958 if (BootpCheckPkt(pkt, dest, src, len))
959 return;
960
961 debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state:"
962 " %d\n", src, dest, len, dhcp_state);
963
964 switch (dhcp_state) {
965 case SELECTING:
966 /*
967 * Wait an appropriate time for any potential DHCPOFFER packets
968 * to arrive. Then select one, and generate DHCPREQUEST
969 * response. If filename is in format we recognize, assume it
970 * is a valid OFFER from a server we want.
971 */
972 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
973 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
974 if (strncmp(bp->bp_file,
975 CONFIG_SYS_BOOTFILE_PREFIX,
976 strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) {
977 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */
978
979 debug("TRANSITIONING TO REQUESTING STATE\n");
980 dhcp_state = REQUESTING;
981
982 if (NetReadLong((ulong *)&bp->bp_vend[0]) ==
983 htonl(BOOTP_VENDOR_MAGIC))
984 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
985
986 NetSetTimeout(5000, BootpTimeout);
987 DhcpSendRequestPkt(bp);
988 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
989 }
990 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */
991
992 return;
993 break;
994 case REQUESTING:
995 debug("DHCP State: REQUESTING\n");
996
997 if (DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK) {
998 if (NetReadLong((ulong *)&bp->bp_vend[0]) ==
999 htonl(BOOTP_VENDOR_MAGIC))
1000 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
1001 /* Store net params from reply */
1002 BootpCopyNetParams(bp);
1003 dhcp_state = BOUND;
1004 printf("DHCP client bound to address %pI4 (%lu ms)\n",
1005 &net_ip, get_timer(bootp_start));
1006 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP,
1007 "bootp_stop");
1008
1009 net_auto_load();
1010 return;
1011 }
1012 break;
1013 case BOUND:
1014 /* DHCP client bound to address */
1015 break;
1016 default:
1017 puts("DHCP: INVALID STATE\n");
1018 break;
1019 }
1020
1021 }
1022
1023 void DhcpRequest(void)
1024 {
1025 BootpRequest();
1026 }
1027 #endif /* CONFIG_CMD_DHCP */
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