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