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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 <net/tftp.h>
15 #include "bootp.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 u32 bootp_ids[CONFIG_BOOTP_ID_CACHE_SIZE];
55 unsigned int bootp_num_ids;
56 int bootp_try;
57 ulong bootp_start;
58 ulong bootp_timeout;
59 char net_nis_domain[32] = {0,}; /* Our NIS domain */
60 char net_hostname[32] = {0,}; /* Our hostname */
61 char net_root_path[64] = {0,}; /* Our bootpath */
62
63 static ulong time_taken_max;
64
65 #if defined(CONFIG_CMD_DHCP)
66 static dhcp_state_t dhcp_state = INIT;
67 static u32 dhcp_leasetime;
68 static struct in_addr dhcp_server_ip;
69 static u8 dhcp_option_overload;
70 #define OVERLOAD_FILE 1
71 #define OVERLOAD_SNAME 2
72 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
73 unsigned src, unsigned len);
74
75 /* For Debug */
76 #if 0
77 static char *dhcpmsg2str(int type)
78 {
79 switch (type) {
80 case 1: return "DHCPDISCOVER"; break;
81 case 2: return "DHCPOFFER"; break;
82 case 3: return "DHCPREQUEST"; break;
83 case 4: return "DHCPDECLINE"; break;
84 case 5: return "DHCPACK"; break;
85 case 6: return "DHCPNACK"; break;
86 case 7: return "DHCPRELEASE"; break;
87 default: return "UNKNOWN/INVALID MSG TYPE"; break;
88 }
89 }
90 #endif
91 #endif
92
93 static void bootp_add_id(ulong id)
94 {
95 if (bootp_num_ids >= ARRAY_SIZE(bootp_ids)) {
96 size_t size = sizeof(bootp_ids) - sizeof(id);
97
98 memmove(bootp_ids, &bootp_ids[1], size);
99 bootp_ids[bootp_num_ids - 1] = id;
100 } else {
101 bootp_ids[bootp_num_ids] = id;
102 bootp_num_ids++;
103 }
104 }
105
106 static bool bootp_match_id(ulong id)
107 {
108 unsigned int i;
109
110 for (i = 0; i < bootp_num_ids; i++)
111 if (bootp_ids[i] == id)
112 return true;
113
114 return false;
115 }
116
117 static int check_reply_packet(uchar *pkt, unsigned dest, unsigned src,
118 unsigned len)
119 {
120 struct bootp_hdr *bp = (struct bootp_hdr *)pkt;
121 int retval = 0;
122
123 if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
124 retval = -1;
125 else if (len < sizeof(struct bootp_hdr) - OPT_FIELD_SIZE)
126 retval = -2;
127 else if (bp->bp_op != OP_BOOTREPLY)
128 retval = -3;
129 else if (bp->bp_htype != HWT_ETHER)
130 retval = -4;
131 else if (bp->bp_hlen != HWL_ETHER)
132 retval = -5;
133 else if (!bootp_match_id(net_read_u32(&bp->bp_id)))
134 retval = -6;
135 else if (memcmp(bp->bp_chaddr, net_ethaddr, HWL_ETHER) != 0)
136 retval = -7;
137
138 debug("Filtering pkt = %d\n", retval);
139
140 return retval;
141 }
142
143 /*
144 * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet
145 */
146 static void store_net_params(struct bootp_hdr *bp)
147 {
148 #if !defined(CONFIG_BOOTP_SERVERIP)
149 struct in_addr tmp_ip;
150
151 net_copy_ip(&tmp_ip, &bp->bp_siaddr);
152 if (tmp_ip.s_addr != 0)
153 net_copy_ip(&net_server_ip, &bp->bp_siaddr);
154 memcpy(net_server_ethaddr,
155 ((struct ethernet_hdr *)net_rx_packet)->et_src, 6);
156 if (
157 #if defined(CONFIG_CMD_DHCP)
158 !(dhcp_option_overload & OVERLOAD_FILE) &&
159 #endif
160 (strlen(bp->bp_file) > 0)) {
161 copy_filename(net_boot_file_name, bp->bp_file,
162 sizeof(net_boot_file_name));
163 }
164
165 debug("net_boot_file_name: %s\n", net_boot_file_name);
166
167 /* Propagate to environment:
168 * don't delete exising entry when BOOTP / DHCP reply does
169 * not contain a new value
170 */
171 if (*net_boot_file_name)
172 setenv("bootfile", net_boot_file_name);
173 #endif
174 net_copy_ip(&net_ip, &bp->bp_yiaddr);
175 }
176
177 static int truncate_sz(const char *name, int maxlen, int curlen)
178 {
179 if (curlen >= maxlen) {
180 printf("*** WARNING: %s is too long (%d - max: %d)"
181 " - truncated\n", name, curlen, maxlen);
182 curlen = maxlen - 1;
183 }
184 return curlen;
185 }
186
187 #if !defined(CONFIG_CMD_DHCP)
188
189 static void bootp_process_vendor_field(u8 *ext)
190 {
191 int size = *(ext + 1);
192
193 debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext,
194 *(ext + 1));
195
196 net_boot_file_expected_size_in_blocks = 0;
197
198 switch (*ext) {
199 /* Fixed length fields */
200 case 1: /* Subnet mask */
201 if (net_netmask.s_addr == 0)
202 net_copy_ip(&net_netmask, (struct in_addr *)(ext + 2));
203 break;
204 case 2: /* Time offset - Not yet supported */
205 break;
206 /* Variable length fields */
207 case 3: /* Gateways list */
208 if (net_gateway.s_addr == 0)
209 net_copy_ip(&net_gateway, (struct in_addr *)(ext + 2));
210 break;
211 case 4: /* Time server - Not yet supported */
212 break;
213 case 5: /* IEN-116 name server - Not yet supported */
214 break;
215 case 6:
216 if (net_dns_server.s_addr == 0)
217 net_copy_ip(&net_dns_server,
218 (struct in_addr *)(ext + 2));
219 #if defined(CONFIG_BOOTP_DNS2)
220 if ((net_dns_server2.s_addr == 0) && (size > 4))
221 net_copy_ip(&net_dns_server2,
222 (struct in_addr *)(ext + 2 + 4));
223 #endif
224 break;
225 case 7: /* Log server - Not yet supported */
226 break;
227 case 8: /* Cookie/Quote server - Not yet supported */
228 break;
229 case 9: /* LPR server - Not yet supported */
230 break;
231 case 10: /* Impress server - Not yet supported */
232 break;
233 case 11: /* RPL server - Not yet supported */
234 break;
235 case 12: /* Host name */
236 if (net_hostname[0] == 0) {
237 size = truncate_sz("Host Name",
238 sizeof(net_hostname), size);
239 memcpy(&net_hostname, ext + 2, size);
240 net_hostname[size] = 0;
241 }
242 break;
243 case 13: /* Boot file size */
244 if (size == 2)
245 net_boot_file_expected_size_in_blocks =
246 ntohs(*(ushort *)(ext + 2));
247 else if (size == 4)
248 net_boot_file_expected_size_in_blocks =
249 ntohl(*(ulong *)(ext + 2));
250 break;
251 case 14: /* Merit dump file - Not yet supported */
252 break;
253 case 15: /* Domain name - Not yet supported */
254 break;
255 case 16: /* Swap server - Not yet supported */
256 break;
257 case 17: /* Root path */
258 if (net_root_path[0] == 0) {
259 size = truncate_sz("Root Path",
260 sizeof(net_root_path), size);
261 memcpy(&net_root_path, ext + 2, size);
262 net_root_path[size] = 0;
263 }
264 break;
265 case 18: /* Extension path - Not yet supported */
266 /*
267 * This can be used to send the information of the
268 * vendor area in another file that the client can
269 * access via TFTP.
270 */
271 break;
272 /* IP host layer fields */
273 case 40: /* NIS Domain name */
274 if (net_nis_domain[0] == 0) {
275 size = truncate_sz("NIS Domain Name",
276 sizeof(net_nis_domain), size);
277 memcpy(&net_nis_domain, ext + 2, size);
278 net_nis_domain[size] = 0;
279 }
280 break;
281 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
282 case 42: /* NTP server IP */
283 net_copy_ip(&net_ntp_server, (struct in_addr *)(ext + 2));
284 break;
285 #endif
286 /* Application layer fields */
287 case 43: /* Vendor specific info - Not yet supported */
288 /*
289 * Binary information to exchange specific
290 * product information.
291 */
292 break;
293 /* Reserved (custom) fields (128..254) */
294 }
295 }
296
297 static void bootp_process_vendor(u8 *ext, int size)
298 {
299 u8 *end = ext + size;
300
301 debug("[BOOTP] Checking extension (%d bytes)...\n", size);
302
303 while ((ext < end) && (*ext != 0xff)) {
304 if (*ext == 0) {
305 ext++;
306 } else {
307 u8 *opt = ext;
308
309 ext += ext[1] + 2;
310 if (ext <= end)
311 bootp_process_vendor_field(opt);
312 }
313 }
314
315 debug("[BOOTP] Received fields:\n");
316 if (net_netmask.s_addr)
317 debug("net_netmask : %pI4\n", &net_netmask);
318
319 if (net_gateway.s_addr)
320 debug("net_gateway : %pI4", &net_gateway);
321
322 if (net_boot_file_expected_size_in_blocks)
323 debug("net_boot_file_expected_size_in_blocks : %d\n",
324 net_boot_file_expected_size_in_blocks);
325
326 if (net_hostname[0])
327 debug("net_hostname : %s\n", net_hostname);
328
329 if (net_root_path[0])
330 debug("net_root_path : %s\n", net_root_path);
331
332 if (net_nis_domain[0])
333 debug("net_nis_domain : %s\n", net_nis_domain);
334
335 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
336 if (net_ntp_server)
337 debug("net_ntp_server : %pI4\n", &net_ntp_server);
338 #endif
339 }
340
341 /*
342 * Handle a BOOTP received packet.
343 */
344 static void bootp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
345 unsigned src, unsigned len)
346 {
347 struct bootp_hdr *bp;
348
349 debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n",
350 src, dest, len, sizeof(struct bootp_hdr));
351
352 bp = (struct bootp_hdr *)pkt;
353
354 /* Filter out pkts we don't want */
355 if (check_reply_packet(pkt, dest, src, len))
356 return;
357
358 /*
359 * Got a good BOOTP reply. Copy the data into our variables.
360 */
361 #if defined(CONFIG_STATUS_LED) && defined(STATUS_LED_BOOT)
362 status_led_set(STATUS_LED_BOOT, STATUS_LED_OFF);
363 #endif
364
365 store_net_params(bp); /* Store net parameters from reply */
366
367 /* Retrieve extended information (we must parse the vendor area) */
368 if (net_read_u32((u32 *)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
369 bootp_process_vendor((uchar *)&bp->bp_vend[4], len);
370
371 net_set_timeout_handler(0, (thand_f *)0);
372 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop");
373
374 debug("Got good BOOTP\n");
375
376 net_auto_load();
377 }
378 #endif
379
380 /*
381 * Timeout on BOOTP/DHCP request.
382 */
383 static void bootp_timeout_handler(void)
384 {
385 ulong time_taken = get_timer(bootp_start);
386
387 if (time_taken >= time_taken_max) {
388 #ifdef CONFIG_BOOTP_MAY_FAIL
389 puts("\nRetry time exceeded\n");
390 net_set_state(NETLOOP_FAIL);
391 #else
392 puts("\nRetry time exceeded; starting again\n");
393 net_start_again();
394 #endif
395 } else {
396 bootp_timeout *= 2;
397 if (bootp_timeout > 2000)
398 bootp_timeout = 2000;
399 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
400 bootp_request();
401 }
402 }
403
404 #define put_vci(e, str) \
405 do { \
406 size_t vci_strlen = strlen(str); \
407 *e++ = 60; /* Vendor Class Identifier */ \
408 *e++ = vci_strlen; \
409 memcpy(e, str, vci_strlen); \
410 e += vci_strlen; \
411 } while (0)
412
413 /*
414 * Initialize BOOTP extension fields in the request.
415 */
416 #if defined(CONFIG_CMD_DHCP)
417 static int dhcp_extended(u8 *e, int message_type, struct in_addr server_ip,
418 struct in_addr requested_ip)
419 {
420 u8 *start = e;
421 u8 *cnt;
422 #if defined(CONFIG_BOOTP_PXE)
423 char *uuid;
424 u16 clientarch;
425 #endif
426
427 #if defined(CONFIG_BOOTP_VENDOREX)
428 u8 *x;
429 #endif
430 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
431 char *hostname;
432 #endif
433
434 *e++ = 99; /* RFC1048 Magic Cookie */
435 *e++ = 130;
436 *e++ = 83;
437 *e++ = 99;
438
439 *e++ = 53; /* DHCP Message Type */
440 *e++ = 1;
441 *e++ = message_type;
442
443 *e++ = 57; /* Maximum DHCP Message Size */
444 *e++ = 2;
445 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 8;
446 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
447
448 if (server_ip.s_addr) {
449 int tmp = ntohl(server_ip.s_addr);
450
451 *e++ = 54; /* ServerID */
452 *e++ = 4;
453 *e++ = tmp >> 24;
454 *e++ = tmp >> 16;
455 *e++ = tmp >> 8;
456 *e++ = tmp & 0xff;
457 }
458
459 if (requested_ip.s_addr) {
460 int tmp = ntohl(requested_ip.s_addr);
461
462 *e++ = 50; /* Requested IP */
463 *e++ = 4;
464 *e++ = tmp >> 24;
465 *e++ = tmp >> 16;
466 *e++ = tmp >> 8;
467 *e++ = tmp & 0xff;
468 }
469 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
470 hostname = getenv("hostname");
471 if (hostname) {
472 int hostnamelen = strlen(hostname);
473
474 *e++ = 12; /* Hostname */
475 *e++ = hostnamelen;
476 memcpy(e, hostname, hostnamelen);
477 e += hostnamelen;
478 }
479 #endif
480
481 #if defined(CONFIG_BOOTP_PXE)
482 clientarch = CONFIG_BOOTP_PXE_CLIENTARCH;
483 *e++ = 93; /* Client System Architecture */
484 *e++ = 2;
485 *e++ = (clientarch >> 8) & 0xff;
486 *e++ = clientarch & 0xff;
487
488 *e++ = 94; /* Client Network Interface Identifier */
489 *e++ = 3;
490 *e++ = 1; /* type field for UNDI */
491 *e++ = 0; /* major revision */
492 *e++ = 0; /* minor revision */
493
494 uuid = getenv("pxeuuid");
495
496 if (uuid) {
497 if (uuid_str_valid(uuid)) {
498 *e++ = 97; /* Client Machine Identifier */
499 *e++ = 17;
500 *e++ = 0; /* type 0 - UUID */
501
502 uuid_str_to_bin(uuid, e, UUID_STR_FORMAT_STD);
503 e += 16;
504 } else {
505 printf("Invalid pxeuuid: %s\n", uuid);
506 }
507 }
508 #endif
509
510 #if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING)
511 put_vci(e, CONFIG_SPL_NET_VCI_STRING);
512 #elif defined(CONFIG_BOOTP_VCI_STRING)
513 put_vci(e, CONFIG_BOOTP_VCI_STRING);
514 #endif
515
516 #if defined(CONFIG_BOOTP_VENDOREX)
517 x = dhcp_vendorex_prep(e);
518 if (x)
519 return x - start;
520 #endif
521
522 *e++ = 55; /* Parameter Request List */
523 cnt = e++; /* Pointer to count of requested items */
524 *cnt = 0;
525 #if defined(CONFIG_BOOTP_SUBNETMASK)
526 *e++ = 1; /* Subnet Mask */
527 *cnt += 1;
528 #endif
529 #if defined(CONFIG_BOOTP_TIMEOFFSET)
530 *e++ = 2;
531 *cnt += 1;
532 #endif
533 #if defined(CONFIG_BOOTP_GATEWAY)
534 *e++ = 3; /* Router Option */
535 *cnt += 1;
536 #endif
537 #if defined(CONFIG_BOOTP_DNS)
538 *e++ = 6; /* DNS Server(s) */
539 *cnt += 1;
540 #endif
541 #if defined(CONFIG_BOOTP_HOSTNAME)
542 *e++ = 12; /* Hostname */
543 *cnt += 1;
544 #endif
545 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
546 *e++ = 13; /* Boot File Size */
547 *cnt += 1;
548 #endif
549 #if defined(CONFIG_BOOTP_BOOTPATH)
550 *e++ = 17; /* Boot path */
551 *cnt += 1;
552 #endif
553 #if defined(CONFIG_BOOTP_NISDOMAIN)
554 *e++ = 40; /* NIS Domain name request */
555 *cnt += 1;
556 #endif
557 #if defined(CONFIG_BOOTP_NTPSERVER)
558 *e++ = 42;
559 *cnt += 1;
560 #endif
561 /* no options, so back up to avoid sending an empty request list */
562 if (*cnt == 0)
563 e -= 2;
564
565 *e++ = 255; /* End of the list */
566
567 /* Pad to minimal length */
568 #ifdef CONFIG_DHCP_MIN_EXT_LEN
569 while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN)
570 *e++ = 0;
571 #endif
572
573 return e - start;
574 }
575
576 #else
577 /*
578 * Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
579 */
580 static int bootp_extended(u8 *e)
581 {
582 u8 *start = e;
583
584 *e++ = 99; /* RFC1048 Magic Cookie */
585 *e++ = 130;
586 *e++ = 83;
587 *e++ = 99;
588
589 #if defined(CONFIG_CMD_DHCP)
590 *e++ = 53; /* DHCP Message Type */
591 *e++ = 1;
592 *e++ = DHCP_DISCOVER;
593
594 *e++ = 57; /* Maximum DHCP Message Size */
595 *e++ = 2;
596 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 16;
597 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
598 #endif
599
600 #if defined(CONFIG_BOOTP_VCI_STRING) || \
601 (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING))
602 #ifdef CONFIG_SPL_BUILD
603 put_vci(e, CONFIG_SPL_NET_VCI_STRING);
604 #else
605 put_vci(e, CONFIG_BOOTP_VCI_STRING);
606 #endif
607 #endif
608
609 #if defined(CONFIG_BOOTP_SUBNETMASK)
610 *e++ = 1; /* Subnet mask request */
611 *e++ = 4;
612 e += 4;
613 #endif
614
615 #if defined(CONFIG_BOOTP_GATEWAY)
616 *e++ = 3; /* Default gateway request */
617 *e++ = 4;
618 e += 4;
619 #endif
620
621 #if defined(CONFIG_BOOTP_DNS)
622 *e++ = 6; /* Domain Name Server */
623 *e++ = 4;
624 e += 4;
625 #endif
626
627 #if defined(CONFIG_BOOTP_HOSTNAME)
628 *e++ = 12; /* Host name request */
629 *e++ = 32;
630 e += 32;
631 #endif
632
633 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
634 *e++ = 13; /* Boot file size */
635 *e++ = 2;
636 e += 2;
637 #endif
638
639 #if defined(CONFIG_BOOTP_BOOTPATH)
640 *e++ = 17; /* Boot path */
641 *e++ = 32;
642 e += 32;
643 #endif
644
645 #if defined(CONFIG_BOOTP_NISDOMAIN)
646 *e++ = 40; /* NIS Domain name request */
647 *e++ = 32;
648 e += 32;
649 #endif
650 #if defined(CONFIG_BOOTP_NTPSERVER)
651 *e++ = 42;
652 *e++ = 4;
653 e += 4;
654 #endif
655
656 *e++ = 255; /* End of the list */
657
658 return e - start;
659 }
660 #endif
661
662 void bootp_reset(void)
663 {
664 bootp_num_ids = 0;
665 bootp_try = 0;
666 bootp_start = get_timer(0);
667 bootp_timeout = 250;
668 }
669
670 void bootp_request(void)
671 {
672 uchar *pkt, *iphdr;
673 struct bootp_hdr *bp;
674 int extlen, pktlen, iplen;
675 int eth_hdr_size;
676 #ifdef CONFIG_BOOTP_RANDOM_DELAY
677 ulong rand_ms;
678 #endif
679 u32 bootp_id;
680 struct in_addr zero_ip;
681 struct in_addr bcast_ip;
682 char *ep; /* Environment pointer */
683
684 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start");
685 #if defined(CONFIG_CMD_DHCP)
686 dhcp_state = INIT;
687 #endif
688
689 ep = getenv("bootpretryperiod");
690 if (ep != NULL)
691 time_taken_max = simple_strtoul(ep, NULL, 10);
692 else
693 time_taken_max = TIMEOUT_MS;
694
695 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */
696 if (bootp_try == 0)
697 srand_mac();
698
699 if (bootp_try <= 2) /* Start with max 1024 * 1ms */
700 rand_ms = rand() >> (22 - bootp_try);
701 else /* After 3rd BOOTP request max 8192 * 1ms */
702 rand_ms = rand() >> 19;
703
704 printf("Random delay: %ld ms...\n", rand_ms);
705 mdelay(rand_ms);
706
707 #endif /* CONFIG_BOOTP_RANDOM_DELAY */
708
709 printf("BOOTP broadcast %d\n", ++bootp_try);
710 pkt = net_tx_packet;
711 memset((void *)pkt, 0, PKTSIZE);
712
713 eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
714 pkt += eth_hdr_size;
715
716 /*
717 * Next line results in incorrect packet size being transmitted,
718 * resulting in errors in some DHCP servers, reporting missing bytes.
719 * Size must be set in packet header after extension length has been
720 * determined.
721 * C. Hallinan, DS4.COM, Inc.
722 */
723 /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC,
724 sizeof (struct bootp_hdr)); */
725 iphdr = pkt; /* We need this later for net_set_udp_header() */
726 pkt += IP_UDP_HDR_SIZE;
727
728 bp = (struct bootp_hdr *)pkt;
729 bp->bp_op = OP_BOOTREQUEST;
730 bp->bp_htype = HWT_ETHER;
731 bp->bp_hlen = HWL_ETHER;
732 bp->bp_hops = 0;
733 /*
734 * according to RFC1542, should be 0 on first request, secs since
735 * first request otherwise
736 */
737 bp->bp_secs = htons(get_timer(bootp_start) / 1000);
738 zero_ip.s_addr = 0;
739 net_write_ip(&bp->bp_ciaddr, zero_ip);
740 net_write_ip(&bp->bp_yiaddr, zero_ip);
741 net_write_ip(&bp->bp_siaddr, zero_ip);
742 net_write_ip(&bp->bp_giaddr, zero_ip);
743 memcpy(bp->bp_chaddr, net_ethaddr, 6);
744 copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
745
746 /* Request additional information from the BOOTP/DHCP server */
747 #if defined(CONFIG_CMD_DHCP)
748 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_DISCOVER, zero_ip,
749 zero_ip);
750 #else
751 extlen = bootp_extended((u8 *)bp->bp_vend);
752 #endif
753
754 /*
755 * Bootp ID is the lower 4 bytes of our ethernet address
756 * plus the current time in ms.
757 */
758 bootp_id = ((u32)net_ethaddr[2] << 24)
759 | ((u32)net_ethaddr[3] << 16)
760 | ((u32)net_ethaddr[4] << 8)
761 | (u32)net_ethaddr[5];
762 bootp_id += get_timer(0);
763 bootp_id = htonl(bootp_id);
764 bootp_add_id(bootp_id);
765 net_copy_u32(&bp->bp_id, &bootp_id);
766
767 /*
768 * Calculate proper packet lengths taking into account the
769 * variable size of the options field
770 */
771 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
772 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
773 bcast_ip.s_addr = 0xFFFFFFFFL;
774 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
775 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
776
777 #if defined(CONFIG_CMD_DHCP)
778 dhcp_state = SELECTING;
779 net_set_udp_handler(dhcp_handler);
780 #else
781 net_set_udp_handler(bootp_handler);
782 #endif
783 net_send_packet(net_tx_packet, pktlen);
784 }
785
786 #if defined(CONFIG_CMD_DHCP)
787 static void dhcp_process_options(uchar *popt, uchar *end)
788 {
789 int oplen, size;
790 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
791 int *to_ptr;
792 #endif
793
794 while (popt < end && *popt != 0xff) {
795 oplen = *(popt + 1);
796 switch (*popt) {
797 case 0:
798 oplen = -1; /* Pad omits len byte */
799 break;
800 case 1:
801 net_copy_ip(&net_netmask, (popt + 2));
802 break;
803 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
804 case 2: /* Time offset */
805 to_ptr = &net_ntp_time_offset;
806 net_copy_u32((u32 *)to_ptr, (u32 *)(popt + 2));
807 net_ntp_time_offset = ntohl(net_ntp_time_offset);
808 break;
809 #endif
810 case 3:
811 net_copy_ip(&net_gateway, (popt + 2));
812 break;
813 case 6:
814 net_copy_ip(&net_dns_server, (popt + 2));
815 #if defined(CONFIG_BOOTP_DNS2)
816 if (*(popt + 1) > 4)
817 net_copy_ip(&net_dns_server2, (popt + 2 + 4));
818 #endif
819 break;
820 case 12:
821 size = truncate_sz("Host Name",
822 sizeof(net_hostname), oplen);
823 memcpy(&net_hostname, popt + 2, size);
824 net_hostname[size] = 0;
825 break;
826 case 15: /* Ignore Domain Name Option */
827 break;
828 case 17:
829 size = truncate_sz("Root Path",
830 sizeof(net_root_path), oplen);
831 memcpy(&net_root_path, popt + 2, size);
832 net_root_path[size] = 0;
833 break;
834 case 28: /* Ignore Broadcast Address Option */
835 break;
836 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
837 case 42: /* NTP server IP */
838 net_copy_ip(&net_ntp_server, (popt + 2));
839 break;
840 #endif
841 case 51:
842 net_copy_u32(&dhcp_leasetime, (u32 *)(popt + 2));
843 break;
844 case 52:
845 dhcp_option_overload = popt[2];
846 break;
847 case 53: /* Ignore Message Type Option */
848 break;
849 case 54:
850 net_copy_ip(&dhcp_server_ip, (popt + 2));
851 break;
852 case 58: /* Ignore Renewal Time Option */
853 break;
854 case 59: /* Ignore Rebinding Time Option */
855 break;
856 case 66: /* Ignore TFTP server name */
857 break;
858 case 67: /* Bootfile option */
859 size = truncate_sz("Bootfile",
860 sizeof(net_boot_file_name), oplen);
861 memcpy(&net_boot_file_name, popt + 2, size);
862 net_boot_file_name[size] = 0;
863 break;
864 default:
865 #if defined(CONFIG_BOOTP_VENDOREX)
866 if (dhcp_vendorex_proc(popt))
867 break;
868 #endif
869 printf("*** Unhandled DHCP Option in OFFER/ACK:"
870 " %d\n", *popt);
871 break;
872 }
873 popt += oplen + 2; /* Process next option */
874 }
875 }
876
877 static void dhcp_packet_process_options(struct bootp_hdr *bp)
878 {
879 uchar *popt = (uchar *)&bp->bp_vend[4];
880 uchar *end = popt + BOOTP_HDR_SIZE;
881
882 if (net_read_u32((u32 *)&bp->bp_vend[0]) != htonl(BOOTP_VENDOR_MAGIC))
883 return;
884
885 dhcp_option_overload = 0;
886
887 /*
888 * The 'options' field MUST be interpreted first, 'file' next,
889 * 'sname' last.
890 */
891 dhcp_process_options(popt, end);
892
893 if (dhcp_option_overload & OVERLOAD_FILE) {
894 popt = (uchar *)bp->bp_file;
895 end = popt + sizeof(bp->bp_file);
896 dhcp_process_options(popt, end);
897 }
898
899 if (dhcp_option_overload & OVERLOAD_SNAME) {
900 popt = (uchar *)bp->bp_sname;
901 end = popt + sizeof(bp->bp_sname);
902 dhcp_process_options(popt, end);
903 }
904 }
905
906 static int dhcp_message_type(unsigned char *popt)
907 {
908 if (net_read_u32((u32 *)popt) != htonl(BOOTP_VENDOR_MAGIC))
909 return -1;
910
911 popt += 4;
912 while (*popt != 0xff) {
913 if (*popt == 53) /* DHCP Message Type */
914 return *(popt + 2);
915 if (*popt == 0) {
916 /* Pad */
917 popt += 1;
918 } else {
919 /* Scan through all options */
920 popt += *(popt + 1) + 2;
921 }
922 }
923 return -1;
924 }
925
926 static void dhcp_send_request_packet(struct bootp_hdr *bp_offer)
927 {
928 uchar *pkt, *iphdr;
929 struct bootp_hdr *bp;
930 int pktlen, iplen, extlen;
931 int eth_hdr_size;
932 struct in_addr offered_ip;
933 struct in_addr zero_ip;
934 struct in_addr bcast_ip;
935
936 debug("dhcp_send_request_packet: Sending DHCPREQUEST\n");
937 pkt = net_tx_packet;
938 memset((void *)pkt, 0, PKTSIZE);
939
940 eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
941 pkt += eth_hdr_size;
942
943 iphdr = pkt; /* We'll need this later to set proper pkt size */
944 pkt += IP_UDP_HDR_SIZE;
945
946 bp = (struct bootp_hdr *)pkt;
947 bp->bp_op = OP_BOOTREQUEST;
948 bp->bp_htype = HWT_ETHER;
949 bp->bp_hlen = HWL_ETHER;
950 bp->bp_hops = 0;
951 bp->bp_secs = htons(get_timer(bootp_start) / 1000);
952 /* Do not set the client IP, your IP, or server IP yet, since it
953 * hasn't been ACK'ed by the server yet */
954
955 /*
956 * RFC3046 requires Relay Agents to discard packets with
957 * nonzero and offered giaddr
958 */
959 zero_ip.s_addr = 0;
960 net_write_ip(&bp->bp_giaddr, zero_ip);
961
962 memcpy(bp->bp_chaddr, net_ethaddr, 6);
963 copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
964
965 /*
966 * ID is the id of the OFFER packet
967 */
968
969 net_copy_u32(&bp->bp_id, &bp_offer->bp_id);
970
971 /*
972 * Copy options from OFFER packet if present
973 */
974
975 /* Copy offered IP into the parameters request list */
976 net_copy_ip(&offered_ip, &bp_offer->bp_yiaddr);
977 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST,
978 dhcp_server_ip, offered_ip);
979
980 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
981 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
982 bcast_ip.s_addr = 0xFFFFFFFFL;
983 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
984
985 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
986 udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
987 #endif /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
988 debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
989 net_send_packet(net_tx_packet, pktlen);
990 }
991
992 /*
993 * Handle DHCP received packets.
994 */
995 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
996 unsigned src, unsigned len)
997 {
998 struct bootp_hdr *bp = (struct bootp_hdr *)pkt;
999
1000 debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
1001 src, dest, len, dhcp_state);
1002
1003 /* Filter out pkts we don't want */
1004 if (check_reply_packet(pkt, dest, src, len))
1005 return;
1006
1007 debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: "
1008 "%d\n", src, dest, len, dhcp_state);
1009
1010 if (net_read_ip(&bp->bp_yiaddr).s_addr == 0)
1011 return;
1012
1013 switch (dhcp_state) {
1014 case SELECTING:
1015 /*
1016 * Wait an appropriate time for any potential DHCPOFFER packets
1017 * to arrive. Then select one, and generate DHCPREQUEST
1018 * response. If filename is in format we recognize, assume it
1019 * is a valid OFFER from a server we want.
1020 */
1021 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
1022 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
1023 if (strncmp(bp->bp_file,
1024 CONFIG_SYS_BOOTFILE_PREFIX,
1025 strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) {
1026 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */
1027 dhcp_packet_process_options(bp);
1028
1029 debug("TRANSITIONING TO REQUESTING STATE\n");
1030 dhcp_state = REQUESTING;
1031
1032 net_set_timeout_handler(5000, bootp_timeout_handler);
1033 dhcp_send_request_packet(bp);
1034 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
1035 }
1036 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */
1037
1038 return;
1039 break;
1040 case REQUESTING:
1041 debug("DHCP State: REQUESTING\n");
1042
1043 if (dhcp_message_type((u8 *)bp->bp_vend) == DHCP_ACK) {
1044 dhcp_packet_process_options(bp);
1045 /* Store net params from reply */
1046 store_net_params(bp);
1047 dhcp_state = BOUND;
1048 printf("DHCP client bound to address %pI4 (%lu ms)\n",
1049 &net_ip, get_timer(bootp_start));
1050 net_set_timeout_handler(0, (thand_f *)0);
1051 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP,
1052 "bootp_stop");
1053
1054 net_auto_load();
1055 return;
1056 }
1057 break;
1058 case BOUND:
1059 /* DHCP client bound to address */
1060 break;
1061 default:
1062 puts("DHCP: INVALID STATE\n");
1063 break;
1064 }
1065 }
1066
1067 void dhcp_request(void)
1068 {
1069 bootp_request();
1070 }
1071 #endif /* CONFIG_CMD_DHCP */
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