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Merge http://git.denx.de/u-boot-samsung
[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 <efi_loader.h>
14 #include <net.h>
15 #include <net/tftp.h>
16 #include "bootp.h"
17 #include "nfs.h"
18 #ifdef CONFIG_STATUS_LED
19 #include <status_led.h>
20 #endif
21 #ifdef CONFIG_BOOTP_RANDOM_DELAY
22 #include "net_rand.h"
23 #endif
24
25 #define BOOTP_VENDOR_MAGIC 0x63825363 /* RFC1048 Magic Cookie */
26
27 /*
28 * The timeout for the initial BOOTP/DHCP request used to be described by a
29 * counter of fixed-length timeout periods. TIMEOUT_COUNT represents
30 * that counter
31 *
32 * Now that the timeout periods are variable (exponential backoff and retry)
33 * we convert the timeout count to the absolute time it would have take to
34 * execute that many retries, and keep sending retry packets until that time
35 * is reached.
36 */
37 #ifndef CONFIG_NET_RETRY_COUNT
38 # define TIMEOUT_COUNT 5 /* # of timeouts before giving up */
39 #else
40 # define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT)
41 #endif
42 #define TIMEOUT_MS ((3 + (TIMEOUT_COUNT * 5)) * 1000)
43
44 #define PORT_BOOTPS 67 /* BOOTP server UDP port */
45 #define PORT_BOOTPC 68 /* BOOTP client UDP port */
46
47 #ifndef CONFIG_DHCP_MIN_EXT_LEN /* minimal length of extension list */
48 #define CONFIG_DHCP_MIN_EXT_LEN 64
49 #endif
50
51 #ifndef CONFIG_BOOTP_ID_CACHE_SIZE
52 #define CONFIG_BOOTP_ID_CACHE_SIZE 4
53 #endif
54
55 u32 bootp_ids[CONFIG_BOOTP_ID_CACHE_SIZE];
56 unsigned int bootp_num_ids;
57 int bootp_try;
58 ulong bootp_start;
59 ulong bootp_timeout;
60 char net_nis_domain[32] = {0,}; /* Our NIS domain */
61 char net_hostname[32] = {0,}; /* Our hostname */
62 char net_root_path[64] = {0,}; /* Our bootpath */
63
64 static ulong time_taken_max;
65
66 #if defined(CONFIG_CMD_DHCP)
67 static dhcp_state_t dhcp_state = INIT;
68 static u32 dhcp_leasetime;
69 static struct in_addr dhcp_server_ip;
70 static u8 dhcp_option_overload;
71 #define OVERLOAD_FILE 1
72 #define OVERLOAD_SNAME 2
73 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
74 unsigned src, unsigned len);
75
76 /* For Debug */
77 #if 0
78 static char *dhcpmsg2str(int type)
79 {
80 switch (type) {
81 case 1: return "DHCPDISCOVER"; break;
82 case 2: return "DHCPOFFER"; break;
83 case 3: return "DHCPREQUEST"; break;
84 case 4: return "DHCPDECLINE"; break;
85 case 5: return "DHCPACK"; break;
86 case 6: return "DHCPNACK"; break;
87 case 7: return "DHCPRELEASE"; break;
88 default: return "UNKNOWN/INVALID MSG TYPE"; break;
89 }
90 }
91 #endif
92 #endif
93
94 static void bootp_add_id(ulong id)
95 {
96 if (bootp_num_ids >= ARRAY_SIZE(bootp_ids)) {
97 size_t size = sizeof(bootp_ids) - sizeof(id);
98
99 memmove(bootp_ids, &bootp_ids[1], size);
100 bootp_ids[bootp_num_ids - 1] = id;
101 } else {
102 bootp_ids[bootp_num_ids] = id;
103 bootp_num_ids++;
104 }
105 }
106
107 static bool bootp_match_id(ulong id)
108 {
109 unsigned int i;
110
111 for (i = 0; i < bootp_num_ids; i++)
112 if (bootp_ids[i] == id)
113 return true;
114
115 return false;
116 }
117
118 static int check_reply_packet(uchar *pkt, unsigned dest, unsigned src,
119 unsigned len)
120 {
121 struct bootp_hdr *bp = (struct bootp_hdr *)pkt;
122 int retval = 0;
123
124 if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
125 retval = -1;
126 else if (len < sizeof(struct bootp_hdr) - OPT_FIELD_SIZE)
127 retval = -2;
128 else if (bp->bp_op != OP_BOOTREPLY)
129 retval = -3;
130 else if (bp->bp_htype != HWT_ETHER)
131 retval = -4;
132 else if (bp->bp_hlen != HWL_ETHER)
133 retval = -5;
134 else if (!bootp_match_id(net_read_u32(&bp->bp_id)))
135 retval = -6;
136 else if (memcmp(bp->bp_chaddr, net_ethaddr, HWL_ETHER) != 0)
137 retval = -7;
138
139 debug("Filtering pkt = %d\n", retval);
140
141 return retval;
142 }
143
144 /*
145 * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet
146 */
147 static void store_net_params(struct bootp_hdr *bp)
148 {
149 #if !defined(CONFIG_BOOTP_SERVERIP)
150 struct in_addr tmp_ip;
151
152 net_copy_ip(&tmp_ip, &bp->bp_siaddr);
153 if (tmp_ip.s_addr != 0)
154 net_copy_ip(&net_server_ip, &bp->bp_siaddr);
155 memcpy(net_server_ethaddr,
156 ((struct ethernet_hdr *)net_rx_packet)->et_src, 6);
157 if (
158 #if defined(CONFIG_CMD_DHCP)
159 !(dhcp_option_overload & OVERLOAD_FILE) &&
160 #endif
161 (strlen(bp->bp_file) > 0)) {
162 copy_filename(net_boot_file_name, bp->bp_file,
163 sizeof(net_boot_file_name));
164 }
165
166 debug("net_boot_file_name: %s\n", net_boot_file_name);
167
168 /* Propagate to environment:
169 * don't delete exising entry when BOOTP / DHCP reply does
170 * not contain a new value
171 */
172 if (*net_boot_file_name)
173 setenv("bootfile", net_boot_file_name);
174 #endif
175 net_copy_ip(&net_ip, &bp->bp_yiaddr);
176 }
177
178 static int truncate_sz(const char *name, int maxlen, int curlen)
179 {
180 if (curlen >= maxlen) {
181 printf("*** WARNING: %s is too long (%d - max: %d)"
182 " - truncated\n", name, curlen, maxlen);
183 curlen = maxlen - 1;
184 }
185 return curlen;
186 }
187
188 #if !defined(CONFIG_CMD_DHCP)
189
190 static void bootp_process_vendor_field(u8 *ext)
191 {
192 int size = *(ext + 1);
193
194 debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext,
195 *(ext + 1));
196
197 net_boot_file_expected_size_in_blocks = 0;
198
199 switch (*ext) {
200 /* Fixed length fields */
201 case 1: /* Subnet mask */
202 if (net_netmask.s_addr == 0)
203 net_copy_ip(&net_netmask, (struct in_addr *)(ext + 2));
204 break;
205 case 2: /* Time offset - Not yet supported */
206 break;
207 /* Variable length fields */
208 case 3: /* Gateways list */
209 if (net_gateway.s_addr == 0)
210 net_copy_ip(&net_gateway, (struct in_addr *)(ext + 2));
211 break;
212 case 4: /* Time server - Not yet supported */
213 break;
214 case 5: /* IEN-116 name server - Not yet supported */
215 break;
216 case 6:
217 if (net_dns_server.s_addr == 0)
218 net_copy_ip(&net_dns_server,
219 (struct in_addr *)(ext + 2));
220 #if defined(CONFIG_BOOTP_DNS2)
221 if ((net_dns_server2.s_addr == 0) && (size > 4))
222 net_copy_ip(&net_dns_server2,
223 (struct in_addr *)(ext + 2 + 4));
224 #endif
225 break;
226 case 7: /* Log server - Not yet supported */
227 break;
228 case 8: /* Cookie/Quote server - Not yet supported */
229 break;
230 case 9: /* LPR server - Not yet supported */
231 break;
232 case 10: /* Impress server - Not yet supported */
233 break;
234 case 11: /* RPL server - Not yet supported */
235 break;
236 case 12: /* Host name */
237 if (net_hostname[0] == 0) {
238 size = truncate_sz("Host Name",
239 sizeof(net_hostname), size);
240 memcpy(&net_hostname, ext + 2, size);
241 net_hostname[size] = 0;
242 }
243 break;
244 case 13: /* Boot file size */
245 if (size == 2)
246 net_boot_file_expected_size_in_blocks =
247 ntohs(*(ushort *)(ext + 2));
248 else if (size == 4)
249 net_boot_file_expected_size_in_blocks =
250 ntohl(*(ulong *)(ext + 2));
251 break;
252 case 14: /* Merit dump file - Not yet supported */
253 break;
254 case 15: /* Domain name - Not yet supported */
255 break;
256 case 16: /* Swap server - Not yet supported */
257 break;
258 case 17: /* Root path */
259 if (net_root_path[0] == 0) {
260 size = truncate_sz("Root Path",
261 sizeof(net_root_path), size);
262 memcpy(&net_root_path, ext + 2, size);
263 net_root_path[size] = 0;
264 }
265 break;
266 case 18: /* Extension path - Not yet supported */
267 /*
268 * This can be used to send the information of the
269 * vendor area in another file that the client can
270 * access via TFTP.
271 */
272 break;
273 /* IP host layer fields */
274 case 40: /* NIS Domain name */
275 if (net_nis_domain[0] == 0) {
276 size = truncate_sz("NIS Domain Name",
277 sizeof(net_nis_domain), size);
278 memcpy(&net_nis_domain, ext + 2, size);
279 net_nis_domain[size] = 0;
280 }
281 break;
282 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
283 case 42: /* NTP server IP */
284 net_copy_ip(&net_ntp_server, (struct in_addr *)(ext + 2));
285 break;
286 #endif
287 /* Application layer fields */
288 case 43: /* Vendor specific info - Not yet supported */
289 /*
290 * Binary information to exchange specific
291 * product information.
292 */
293 break;
294 /* Reserved (custom) fields (128..254) */
295 }
296 }
297
298 static void bootp_process_vendor(u8 *ext, int size)
299 {
300 u8 *end = ext + size;
301
302 debug("[BOOTP] Checking extension (%d bytes)...\n", size);
303
304 while ((ext < end) && (*ext != 0xff)) {
305 if (*ext == 0) {
306 ext++;
307 } else {
308 u8 *opt = ext;
309
310 ext += ext[1] + 2;
311 if (ext <= end)
312 bootp_process_vendor_field(opt);
313 }
314 }
315
316 debug("[BOOTP] Received fields:\n");
317 if (net_netmask.s_addr)
318 debug("net_netmask : %pI4\n", &net_netmask);
319
320 if (net_gateway.s_addr)
321 debug("net_gateway : %pI4", &net_gateway);
322
323 if (net_boot_file_expected_size_in_blocks)
324 debug("net_boot_file_expected_size_in_blocks : %d\n",
325 net_boot_file_expected_size_in_blocks);
326
327 if (net_hostname[0])
328 debug("net_hostname : %s\n", net_hostname);
329
330 if (net_root_path[0])
331 debug("net_root_path : %s\n", net_root_path);
332
333 if (net_nis_domain[0])
334 debug("net_nis_domain : %s\n", net_nis_domain);
335
336 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
337 if (net_ntp_server)
338 debug("net_ntp_server : %pI4\n", &net_ntp_server);
339 #endif
340 }
341
342 /*
343 * Handle a BOOTP received packet.
344 */
345 static void bootp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
346 unsigned src, unsigned len)
347 {
348 struct bootp_hdr *bp;
349
350 debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n",
351 src, dest, len, sizeof(struct bootp_hdr));
352
353 bp = (struct bootp_hdr *)pkt;
354
355 /* Filter out pkts we don't want */
356 if (check_reply_packet(pkt, dest, src, len))
357 return;
358
359 /*
360 * Got a good BOOTP reply. Copy the data into our variables.
361 */
362 #if defined(CONFIG_STATUS_LED) && defined(STATUS_LED_BOOT)
363 status_led_set(STATUS_LED_BOOT, STATUS_LED_OFF);
364 #endif
365
366 store_net_params(bp); /* Store net parameters from reply */
367
368 /* Retrieve extended information (we must parse the vendor area) */
369 if (net_read_u32((u32 *)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
370 bootp_process_vendor((uchar *)&bp->bp_vend[4], len);
371
372 net_set_timeout_handler(0, (thand_f *)0);
373 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop");
374
375 debug("Got good BOOTP\n");
376
377 net_auto_load();
378 }
379 #endif
380
381 /*
382 * Timeout on BOOTP/DHCP request.
383 */
384 static void bootp_timeout_handler(void)
385 {
386 ulong time_taken = get_timer(bootp_start);
387
388 if (time_taken >= time_taken_max) {
389 #ifdef CONFIG_BOOTP_MAY_FAIL
390 puts("\nRetry time exceeded\n");
391 net_set_state(NETLOOP_FAIL);
392 #else
393 puts("\nRetry time exceeded; starting again\n");
394 net_start_again();
395 #endif
396 } else {
397 bootp_timeout *= 2;
398 if (bootp_timeout > 2000)
399 bootp_timeout = 2000;
400 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
401 bootp_request();
402 }
403 }
404
405 #define put_vci(e, str) \
406 do { \
407 size_t vci_strlen = strlen(str); \
408 *e++ = 60; /* Vendor Class Identifier */ \
409 *e++ = vci_strlen; \
410 memcpy(e, str, vci_strlen); \
411 e += vci_strlen; \
412 } while (0)
413
414 static u8 *add_vci(u8 *e)
415 {
416 char *vci = NULL;
417 char *env_vci = getenv("bootp_vci");
418
419 #if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING)
420 vci = CONFIG_SPL_NET_VCI_STRING;
421 #elif defined(CONFIG_BOOTP_VCI_STRING)
422 vci = CONFIG_BOOTP_VCI_STRING;
423 #endif
424
425 if (env_vci)
426 vci = env_vci;
427
428 if (vci)
429 put_vci(e, vci);
430
431 return e;
432 }
433
434 /*
435 * Initialize BOOTP extension fields in the request.
436 */
437 #if defined(CONFIG_CMD_DHCP)
438 static int dhcp_extended(u8 *e, int message_type, struct in_addr server_ip,
439 struct in_addr requested_ip)
440 {
441 u8 *start = e;
442 u8 *cnt;
443 #ifdef CONFIG_LIB_UUID
444 char *uuid;
445 #endif
446 int clientarch = -1;
447
448 #if defined(CONFIG_BOOTP_VENDOREX)
449 u8 *x;
450 #endif
451 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
452 char *hostname;
453 #endif
454
455 *e++ = 99; /* RFC1048 Magic Cookie */
456 *e++ = 130;
457 *e++ = 83;
458 *e++ = 99;
459
460 *e++ = 53; /* DHCP Message Type */
461 *e++ = 1;
462 *e++ = message_type;
463
464 *e++ = 57; /* Maximum DHCP Message Size */
465 *e++ = 2;
466 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 8;
467 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
468
469 if (server_ip.s_addr) {
470 int tmp = ntohl(server_ip.s_addr);
471
472 *e++ = 54; /* ServerID */
473 *e++ = 4;
474 *e++ = tmp >> 24;
475 *e++ = tmp >> 16;
476 *e++ = tmp >> 8;
477 *e++ = tmp & 0xff;
478 }
479
480 if (requested_ip.s_addr) {
481 int tmp = ntohl(requested_ip.s_addr);
482
483 *e++ = 50; /* Requested IP */
484 *e++ = 4;
485 *e++ = tmp >> 24;
486 *e++ = tmp >> 16;
487 *e++ = tmp >> 8;
488 *e++ = tmp & 0xff;
489 }
490 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
491 hostname = getenv("hostname");
492 if (hostname) {
493 int hostnamelen = strlen(hostname);
494
495 *e++ = 12; /* Hostname */
496 *e++ = hostnamelen;
497 memcpy(e, hostname, hostnamelen);
498 e += hostnamelen;
499 }
500 #endif
501
502 #ifdef CONFIG_BOOTP_PXE_CLIENTARCH
503 clientarch = CONFIG_BOOTP_PXE_CLIENTARCH;
504 #endif
505
506 if (getenv("bootp_arch"))
507 clientarch = getenv_ulong("bootp_arch", 16, clientarch);
508
509 if (clientarch > 0) {
510 *e++ = 93; /* Client System Architecture */
511 *e++ = 2;
512 *e++ = (clientarch >> 8) & 0xff;
513 *e++ = clientarch & 0xff;
514 }
515
516 *e++ = 94; /* Client Network Interface Identifier */
517 *e++ = 3;
518 *e++ = 1; /* type field for UNDI */
519 *e++ = 0; /* major revision */
520 *e++ = 0; /* minor revision */
521
522 #ifdef CONFIG_LIB_UUID
523 uuid = getenv("pxeuuid");
524
525 if (uuid) {
526 if (uuid_str_valid(uuid)) {
527 *e++ = 97; /* Client Machine Identifier */
528 *e++ = 17;
529 *e++ = 0; /* type 0 - UUID */
530
531 uuid_str_to_bin(uuid, e, UUID_STR_FORMAT_STD);
532 e += 16;
533 } else {
534 printf("Invalid pxeuuid: %s\n", uuid);
535 }
536 }
537 #endif
538
539 e = add_vci(e);
540
541 #if defined(CONFIG_BOOTP_VENDOREX)
542 x = dhcp_vendorex_prep(e);
543 if (x)
544 return x - start;
545 #endif
546
547 *e++ = 55; /* Parameter Request List */
548 cnt = e++; /* Pointer to count of requested items */
549 *cnt = 0;
550 #if defined(CONFIG_BOOTP_SUBNETMASK)
551 *e++ = 1; /* Subnet Mask */
552 *cnt += 1;
553 #endif
554 #if defined(CONFIG_BOOTP_TIMEOFFSET)
555 *e++ = 2;
556 *cnt += 1;
557 #endif
558 #if defined(CONFIG_BOOTP_GATEWAY)
559 *e++ = 3; /* Router Option */
560 *cnt += 1;
561 #endif
562 #if defined(CONFIG_BOOTP_DNS)
563 *e++ = 6; /* DNS Server(s) */
564 *cnt += 1;
565 #endif
566 #if defined(CONFIG_BOOTP_HOSTNAME)
567 *e++ = 12; /* Hostname */
568 *cnt += 1;
569 #endif
570 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
571 *e++ = 13; /* Boot File Size */
572 *cnt += 1;
573 #endif
574 #if defined(CONFIG_BOOTP_BOOTPATH)
575 *e++ = 17; /* Boot path */
576 *cnt += 1;
577 #endif
578 #if defined(CONFIG_BOOTP_NISDOMAIN)
579 *e++ = 40; /* NIS Domain name request */
580 *cnt += 1;
581 #endif
582 #if defined(CONFIG_BOOTP_NTPSERVER)
583 *e++ = 42;
584 *cnt += 1;
585 #endif
586 /* no options, so back up to avoid sending an empty request list */
587 if (*cnt == 0)
588 e -= 2;
589
590 *e++ = 255; /* End of the list */
591
592 /* Pad to minimal length */
593 #ifdef CONFIG_DHCP_MIN_EXT_LEN
594 while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN)
595 *e++ = 0;
596 #endif
597
598 return e - start;
599 }
600
601 #else
602 /*
603 * Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
604 */
605 static int bootp_extended(u8 *e)
606 {
607 u8 *start = e;
608
609 *e++ = 99; /* RFC1048 Magic Cookie */
610 *e++ = 130;
611 *e++ = 83;
612 *e++ = 99;
613
614 #if defined(CONFIG_CMD_DHCP)
615 *e++ = 53; /* DHCP Message Type */
616 *e++ = 1;
617 *e++ = DHCP_DISCOVER;
618
619 *e++ = 57; /* Maximum DHCP Message Size */
620 *e++ = 2;
621 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 16;
622 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
623 #endif
624
625 add_vci(e);
626
627 #if defined(CONFIG_BOOTP_SUBNETMASK)
628 *e++ = 1; /* Subnet mask request */
629 *e++ = 4;
630 e += 4;
631 #endif
632
633 #if defined(CONFIG_BOOTP_GATEWAY)
634 *e++ = 3; /* Default gateway request */
635 *e++ = 4;
636 e += 4;
637 #endif
638
639 #if defined(CONFIG_BOOTP_DNS)
640 *e++ = 6; /* Domain Name Server */
641 *e++ = 4;
642 e += 4;
643 #endif
644
645 #if defined(CONFIG_BOOTP_HOSTNAME)
646 *e++ = 12; /* Host name request */
647 *e++ = 32;
648 e += 32;
649 #endif
650
651 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
652 *e++ = 13; /* Boot file size */
653 *e++ = 2;
654 e += 2;
655 #endif
656
657 #if defined(CONFIG_BOOTP_BOOTPATH)
658 *e++ = 17; /* Boot path */
659 *e++ = 32;
660 e += 32;
661 #endif
662
663 #if defined(CONFIG_BOOTP_NISDOMAIN)
664 *e++ = 40; /* NIS Domain name request */
665 *e++ = 32;
666 e += 32;
667 #endif
668 #if defined(CONFIG_BOOTP_NTPSERVER)
669 *e++ = 42;
670 *e++ = 4;
671 e += 4;
672 #endif
673
674 *e++ = 255; /* End of the list */
675
676 return e - start;
677 }
678 #endif
679
680 void bootp_reset(void)
681 {
682 bootp_num_ids = 0;
683 bootp_try = 0;
684 bootp_start = get_timer(0);
685 bootp_timeout = 250;
686 }
687
688 void bootp_request(void)
689 {
690 uchar *pkt, *iphdr;
691 struct bootp_hdr *bp;
692 int extlen, pktlen, iplen;
693 int eth_hdr_size;
694 #ifdef CONFIG_BOOTP_RANDOM_DELAY
695 ulong rand_ms;
696 #endif
697 u32 bootp_id;
698 struct in_addr zero_ip;
699 struct in_addr bcast_ip;
700 char *ep; /* Environment pointer */
701
702 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start");
703 #if defined(CONFIG_CMD_DHCP)
704 dhcp_state = INIT;
705 #endif
706
707 ep = getenv("bootpretryperiod");
708 if (ep != NULL)
709 time_taken_max = simple_strtoul(ep, NULL, 10);
710 else
711 time_taken_max = TIMEOUT_MS;
712
713 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */
714 if (bootp_try == 0)
715 srand_mac();
716
717 if (bootp_try <= 2) /* Start with max 1024 * 1ms */
718 rand_ms = rand() >> (22 - bootp_try);
719 else /* After 3rd BOOTP request max 8192 * 1ms */
720 rand_ms = rand() >> 19;
721
722 printf("Random delay: %ld ms...\n", rand_ms);
723 mdelay(rand_ms);
724
725 #endif /* CONFIG_BOOTP_RANDOM_DELAY */
726
727 printf("BOOTP broadcast %d\n", ++bootp_try);
728 pkt = net_tx_packet;
729 memset((void *)pkt, 0, PKTSIZE);
730
731 eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
732 pkt += eth_hdr_size;
733
734 /*
735 * Next line results in incorrect packet size being transmitted,
736 * resulting in errors in some DHCP servers, reporting missing bytes.
737 * Size must be set in packet header after extension length has been
738 * determined.
739 * C. Hallinan, DS4.COM, Inc.
740 */
741 /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC,
742 sizeof (struct bootp_hdr)); */
743 iphdr = pkt; /* We need this later for net_set_udp_header() */
744 pkt += IP_UDP_HDR_SIZE;
745
746 bp = (struct bootp_hdr *)pkt;
747 bp->bp_op = OP_BOOTREQUEST;
748 bp->bp_htype = HWT_ETHER;
749 bp->bp_hlen = HWL_ETHER;
750 bp->bp_hops = 0;
751 /*
752 * according to RFC1542, should be 0 on first request, secs since
753 * first request otherwise
754 */
755 bp->bp_secs = htons(get_timer(bootp_start) / 1000);
756 zero_ip.s_addr = 0;
757 net_write_ip(&bp->bp_ciaddr, zero_ip);
758 net_write_ip(&bp->bp_yiaddr, zero_ip);
759 net_write_ip(&bp->bp_siaddr, zero_ip);
760 net_write_ip(&bp->bp_giaddr, zero_ip);
761 memcpy(bp->bp_chaddr, net_ethaddr, 6);
762 copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
763
764 /* Request additional information from the BOOTP/DHCP server */
765 #if defined(CONFIG_CMD_DHCP)
766 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_DISCOVER, zero_ip,
767 zero_ip);
768 #else
769 extlen = bootp_extended((u8 *)bp->bp_vend);
770 #endif
771
772 /*
773 * Bootp ID is the lower 4 bytes of our ethernet address
774 * plus the current time in ms.
775 */
776 bootp_id = ((u32)net_ethaddr[2] << 24)
777 | ((u32)net_ethaddr[3] << 16)
778 | ((u32)net_ethaddr[4] << 8)
779 | (u32)net_ethaddr[5];
780 bootp_id += get_timer(0);
781 bootp_id = htonl(bootp_id);
782 bootp_add_id(bootp_id);
783 net_copy_u32(&bp->bp_id, &bootp_id);
784
785 /*
786 * Calculate proper packet lengths taking into account the
787 * variable size of the options field
788 */
789 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
790 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
791 bcast_ip.s_addr = 0xFFFFFFFFL;
792 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
793 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
794
795 #if defined(CONFIG_CMD_DHCP)
796 dhcp_state = SELECTING;
797 net_set_udp_handler(dhcp_handler);
798 #else
799 net_set_udp_handler(bootp_handler);
800 #endif
801 net_send_packet(net_tx_packet, pktlen);
802 }
803
804 #if defined(CONFIG_CMD_DHCP)
805 static void dhcp_process_options(uchar *popt, uchar *end)
806 {
807 int oplen, size;
808 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
809 int *to_ptr;
810 #endif
811
812 while (popt < end && *popt != 0xff) {
813 oplen = *(popt + 1);
814 switch (*popt) {
815 case 0:
816 oplen = -1; /* Pad omits len byte */
817 break;
818 case 1:
819 net_copy_ip(&net_netmask, (popt + 2));
820 break;
821 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
822 case 2: /* Time offset */
823 to_ptr = &net_ntp_time_offset;
824 net_copy_u32((u32 *)to_ptr, (u32 *)(popt + 2));
825 net_ntp_time_offset = ntohl(net_ntp_time_offset);
826 break;
827 #endif
828 case 3:
829 net_copy_ip(&net_gateway, (popt + 2));
830 break;
831 case 6:
832 net_copy_ip(&net_dns_server, (popt + 2));
833 #if defined(CONFIG_BOOTP_DNS2)
834 if (*(popt + 1) > 4)
835 net_copy_ip(&net_dns_server2, (popt + 2 + 4));
836 #endif
837 break;
838 case 12:
839 size = truncate_sz("Host Name",
840 sizeof(net_hostname), oplen);
841 memcpy(&net_hostname, popt + 2, size);
842 net_hostname[size] = 0;
843 break;
844 case 15: /* Ignore Domain Name Option */
845 break;
846 case 17:
847 size = truncate_sz("Root Path",
848 sizeof(net_root_path), oplen);
849 memcpy(&net_root_path, popt + 2, size);
850 net_root_path[size] = 0;
851 break;
852 case 28: /* Ignore Broadcast Address Option */
853 break;
854 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
855 case 42: /* NTP server IP */
856 net_copy_ip(&net_ntp_server, (popt + 2));
857 break;
858 #endif
859 case 51:
860 net_copy_u32(&dhcp_leasetime, (u32 *)(popt + 2));
861 break;
862 case 52:
863 dhcp_option_overload = popt[2];
864 break;
865 case 53: /* Ignore Message Type Option */
866 break;
867 case 54:
868 net_copy_ip(&dhcp_server_ip, (popt + 2));
869 break;
870 case 58: /* Ignore Renewal Time Option */
871 break;
872 case 59: /* Ignore Rebinding Time Option */
873 break;
874 case 66: /* Ignore TFTP server name */
875 break;
876 case 67: /* Bootfile option */
877 size = truncate_sz("Bootfile",
878 sizeof(net_boot_file_name), oplen);
879 memcpy(&net_boot_file_name, popt + 2, size);
880 net_boot_file_name[size] = 0;
881 break;
882 default:
883 #if defined(CONFIG_BOOTP_VENDOREX)
884 if (dhcp_vendorex_proc(popt))
885 break;
886 #endif
887 printf("*** Unhandled DHCP Option in OFFER/ACK:"
888 " %d\n", *popt);
889 break;
890 }
891 popt += oplen + 2; /* Process next option */
892 }
893 }
894
895 static void dhcp_packet_process_options(struct bootp_hdr *bp)
896 {
897 uchar *popt = (uchar *)&bp->bp_vend[4];
898 uchar *end = popt + BOOTP_HDR_SIZE;
899
900 if (net_read_u32((u32 *)&bp->bp_vend[0]) != htonl(BOOTP_VENDOR_MAGIC))
901 return;
902
903 dhcp_option_overload = 0;
904
905 /*
906 * The 'options' field MUST be interpreted first, 'file' next,
907 * 'sname' last.
908 */
909 dhcp_process_options(popt, end);
910
911 if (dhcp_option_overload & OVERLOAD_FILE) {
912 popt = (uchar *)bp->bp_file;
913 end = popt + sizeof(bp->bp_file);
914 dhcp_process_options(popt, end);
915 }
916
917 if (dhcp_option_overload & OVERLOAD_SNAME) {
918 popt = (uchar *)bp->bp_sname;
919 end = popt + sizeof(bp->bp_sname);
920 dhcp_process_options(popt, end);
921 }
922 }
923
924 static int dhcp_message_type(unsigned char *popt)
925 {
926 if (net_read_u32((u32 *)popt) != htonl(BOOTP_VENDOR_MAGIC))
927 return -1;
928
929 popt += 4;
930 while (*popt != 0xff) {
931 if (*popt == 53) /* DHCP Message Type */
932 return *(popt + 2);
933 if (*popt == 0) {
934 /* Pad */
935 popt += 1;
936 } else {
937 /* Scan through all options */
938 popt += *(popt + 1) + 2;
939 }
940 }
941 return -1;
942 }
943
944 static void dhcp_send_request_packet(struct bootp_hdr *bp_offer)
945 {
946 uchar *pkt, *iphdr;
947 struct bootp_hdr *bp;
948 int pktlen, iplen, extlen;
949 int eth_hdr_size;
950 struct in_addr offered_ip;
951 struct in_addr zero_ip;
952 struct in_addr bcast_ip;
953
954 debug("dhcp_send_request_packet: Sending DHCPREQUEST\n");
955 pkt = net_tx_packet;
956 memset((void *)pkt, 0, PKTSIZE);
957
958 eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
959 pkt += eth_hdr_size;
960
961 iphdr = pkt; /* We'll need this later to set proper pkt size */
962 pkt += IP_UDP_HDR_SIZE;
963
964 bp = (struct bootp_hdr *)pkt;
965 bp->bp_op = OP_BOOTREQUEST;
966 bp->bp_htype = HWT_ETHER;
967 bp->bp_hlen = HWL_ETHER;
968 bp->bp_hops = 0;
969 bp->bp_secs = htons(get_timer(bootp_start) / 1000);
970 /* Do not set the client IP, your IP, or server IP yet, since it
971 * hasn't been ACK'ed by the server yet */
972
973 /*
974 * RFC3046 requires Relay Agents to discard packets with
975 * nonzero and offered giaddr
976 */
977 zero_ip.s_addr = 0;
978 net_write_ip(&bp->bp_giaddr, zero_ip);
979
980 memcpy(bp->bp_chaddr, net_ethaddr, 6);
981 copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
982
983 /*
984 * ID is the id of the OFFER packet
985 */
986
987 net_copy_u32(&bp->bp_id, &bp_offer->bp_id);
988
989 /*
990 * Copy options from OFFER packet if present
991 */
992
993 /* Copy offered IP into the parameters request list */
994 net_copy_ip(&offered_ip, &bp_offer->bp_yiaddr);
995 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST,
996 dhcp_server_ip, offered_ip);
997
998 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
999 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
1000 bcast_ip.s_addr = 0xFFFFFFFFL;
1001 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
1002
1003 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
1004 udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
1005 #endif /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
1006 debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
1007 net_send_packet(net_tx_packet, pktlen);
1008 }
1009
1010 /*
1011 * Handle DHCP received packets.
1012 */
1013 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
1014 unsigned src, unsigned len)
1015 {
1016 struct bootp_hdr *bp = (struct bootp_hdr *)pkt;
1017
1018 debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
1019 src, dest, len, dhcp_state);
1020
1021 /* Filter out pkts we don't want */
1022 if (check_reply_packet(pkt, dest, src, len))
1023 return;
1024
1025 debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: "
1026 "%d\n", src, dest, len, dhcp_state);
1027
1028 if (net_read_ip(&bp->bp_yiaddr).s_addr == 0)
1029 return;
1030
1031 switch (dhcp_state) {
1032 case SELECTING:
1033 /*
1034 * Wait an appropriate time for any potential DHCPOFFER packets
1035 * to arrive. Then select one, and generate DHCPREQUEST
1036 * response. If filename is in format we recognize, assume it
1037 * is a valid OFFER from a server we want.
1038 */
1039 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
1040 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
1041 if (strncmp(bp->bp_file,
1042 CONFIG_SYS_BOOTFILE_PREFIX,
1043 strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) {
1044 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */
1045 dhcp_packet_process_options(bp);
1046 efi_net_set_dhcp_ack(pkt, len);
1047
1048 debug("TRANSITIONING TO REQUESTING STATE\n");
1049 dhcp_state = REQUESTING;
1050
1051 net_set_timeout_handler(5000, bootp_timeout_handler);
1052 dhcp_send_request_packet(bp);
1053 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
1054 }
1055 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */
1056
1057 return;
1058 break;
1059 case REQUESTING:
1060 debug("DHCP State: REQUESTING\n");
1061
1062 if (dhcp_message_type((u8 *)bp->bp_vend) == DHCP_ACK) {
1063 dhcp_packet_process_options(bp);
1064 /* Store net params from reply */
1065 store_net_params(bp);
1066 dhcp_state = BOUND;
1067 printf("DHCP client bound to address %pI4 (%lu ms)\n",
1068 &net_ip, get_timer(bootp_start));
1069 net_set_timeout_handler(0, (thand_f *)0);
1070 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP,
1071 "bootp_stop");
1072
1073 net_auto_load();
1074 return;
1075 }
1076 break;
1077 case BOUND:
1078 /* DHCP client bound to address */
1079 break;
1080 default:
1081 puts("DHCP: INVALID STATE\n");
1082 break;
1083 }
1084 }
1085
1086 void dhcp_request(void)
1087 {
1088 bootp_request();
1089 }
1090 #endif /* CONFIG_CMD_DHCP */
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