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Merge git://www.denx.de/git/u-boot-cfi-flash
[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_LED_STATUS
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_LED_STATUS) && defined(CONFIG_LED_STATUS_BOOT_ENABLE)
363 status_led_set(CONFIG_LED_STATUS_BOOT, CONFIG_LED_STATUS_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 /*
677 * If nothing in list, remove it altogether. Some DHCP servers get
678 * upset by this minor faux pas and do not respond at all.
679 */
680 if (e == start + 3) {
681 printf("*** Warning: no DHCP options requested\n");
682 e -= 3;
683 }
684
685 return e - start;
686 }
687 #endif
688
689 void bootp_reset(void)
690 {
691 bootp_num_ids = 0;
692 bootp_try = 0;
693 bootp_start = get_timer(0);
694 bootp_timeout = 250;
695 }
696
697 void bootp_request(void)
698 {
699 uchar *pkt, *iphdr;
700 struct bootp_hdr *bp;
701 int extlen, pktlen, iplen;
702 int eth_hdr_size;
703 #ifdef CONFIG_BOOTP_RANDOM_DELAY
704 ulong rand_ms;
705 #endif
706 u32 bootp_id;
707 struct in_addr zero_ip;
708 struct in_addr bcast_ip;
709 char *ep; /* Environment pointer */
710
711 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start");
712 #if defined(CONFIG_CMD_DHCP)
713 dhcp_state = INIT;
714 #endif
715
716 ep = getenv("bootpretryperiod");
717 if (ep != NULL)
718 time_taken_max = simple_strtoul(ep, NULL, 10);
719 else
720 time_taken_max = TIMEOUT_MS;
721
722 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */
723 if (bootp_try == 0)
724 srand_mac();
725
726 if (bootp_try <= 2) /* Start with max 1024 * 1ms */
727 rand_ms = rand() >> (22 - bootp_try);
728 else /* After 3rd BOOTP request max 8192 * 1ms */
729 rand_ms = rand() >> 19;
730
731 printf("Random delay: %ld ms...\n", rand_ms);
732 mdelay(rand_ms);
733
734 #endif /* CONFIG_BOOTP_RANDOM_DELAY */
735
736 printf("BOOTP broadcast %d\n", ++bootp_try);
737 pkt = net_tx_packet;
738 memset((void *)pkt, 0, PKTSIZE);
739
740 eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
741 pkt += eth_hdr_size;
742
743 /*
744 * Next line results in incorrect packet size being transmitted,
745 * resulting in errors in some DHCP servers, reporting missing bytes.
746 * Size must be set in packet header after extension length has been
747 * determined.
748 * C. Hallinan, DS4.COM, Inc.
749 */
750 /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC,
751 sizeof (struct bootp_hdr)); */
752 iphdr = pkt; /* We need this later for net_set_udp_header() */
753 pkt += IP_UDP_HDR_SIZE;
754
755 bp = (struct bootp_hdr *)pkt;
756 bp->bp_op = OP_BOOTREQUEST;
757 bp->bp_htype = HWT_ETHER;
758 bp->bp_hlen = HWL_ETHER;
759 bp->bp_hops = 0;
760 /*
761 * according to RFC1542, should be 0 on first request, secs since
762 * first request otherwise
763 */
764 bp->bp_secs = htons(get_timer(bootp_start) / 1000);
765 zero_ip.s_addr = 0;
766 net_write_ip(&bp->bp_ciaddr, zero_ip);
767 net_write_ip(&bp->bp_yiaddr, zero_ip);
768 net_write_ip(&bp->bp_siaddr, zero_ip);
769 net_write_ip(&bp->bp_giaddr, zero_ip);
770 memcpy(bp->bp_chaddr, net_ethaddr, 6);
771 copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
772
773 /* Request additional information from the BOOTP/DHCP server */
774 #if defined(CONFIG_CMD_DHCP)
775 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_DISCOVER, zero_ip,
776 zero_ip);
777 #else
778 extlen = bootp_extended((u8 *)bp->bp_vend);
779 #endif
780
781 /*
782 * Bootp ID is the lower 4 bytes of our ethernet address
783 * plus the current time in ms.
784 */
785 bootp_id = ((u32)net_ethaddr[2] << 24)
786 | ((u32)net_ethaddr[3] << 16)
787 | ((u32)net_ethaddr[4] << 8)
788 | (u32)net_ethaddr[5];
789 bootp_id += get_timer(0);
790 bootp_id = htonl(bootp_id);
791 bootp_add_id(bootp_id);
792 net_copy_u32(&bp->bp_id, &bootp_id);
793
794 /*
795 * Calculate proper packet lengths taking into account the
796 * variable size of the options field
797 */
798 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
799 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
800 bcast_ip.s_addr = 0xFFFFFFFFL;
801 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
802 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
803
804 #if defined(CONFIG_CMD_DHCP)
805 dhcp_state = SELECTING;
806 net_set_udp_handler(dhcp_handler);
807 #else
808 net_set_udp_handler(bootp_handler);
809 #endif
810 net_send_packet(net_tx_packet, pktlen);
811 }
812
813 #if defined(CONFIG_CMD_DHCP)
814 static void dhcp_process_options(uchar *popt, uchar *end)
815 {
816 int oplen, size;
817 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
818 int *to_ptr;
819 #endif
820
821 while (popt < end && *popt != 0xff) {
822 oplen = *(popt + 1);
823 switch (*popt) {
824 case 0:
825 oplen = -1; /* Pad omits len byte */
826 break;
827 case 1:
828 net_copy_ip(&net_netmask, (popt + 2));
829 break;
830 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
831 case 2: /* Time offset */
832 to_ptr = &net_ntp_time_offset;
833 net_copy_u32((u32 *)to_ptr, (u32 *)(popt + 2));
834 net_ntp_time_offset = ntohl(net_ntp_time_offset);
835 break;
836 #endif
837 case 3:
838 net_copy_ip(&net_gateway, (popt + 2));
839 break;
840 case 6:
841 net_copy_ip(&net_dns_server, (popt + 2));
842 #if defined(CONFIG_BOOTP_DNS2)
843 if (*(popt + 1) > 4)
844 net_copy_ip(&net_dns_server2, (popt + 2 + 4));
845 #endif
846 break;
847 case 12:
848 size = truncate_sz("Host Name",
849 sizeof(net_hostname), oplen);
850 memcpy(&net_hostname, popt + 2, size);
851 net_hostname[size] = 0;
852 break;
853 case 15: /* Ignore Domain Name Option */
854 break;
855 case 17:
856 size = truncate_sz("Root Path",
857 sizeof(net_root_path), oplen);
858 memcpy(&net_root_path, popt + 2, size);
859 net_root_path[size] = 0;
860 break;
861 case 28: /* Ignore Broadcast Address Option */
862 break;
863 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
864 case 42: /* NTP server IP */
865 net_copy_ip(&net_ntp_server, (popt + 2));
866 break;
867 #endif
868 case 51:
869 net_copy_u32(&dhcp_leasetime, (u32 *)(popt + 2));
870 break;
871 case 52:
872 dhcp_option_overload = popt[2];
873 break;
874 case 53: /* Ignore Message Type Option */
875 break;
876 case 54:
877 net_copy_ip(&dhcp_server_ip, (popt + 2));
878 break;
879 case 58: /* Ignore Renewal Time Option */
880 break;
881 case 59: /* Ignore Rebinding Time Option */
882 break;
883 case 66: /* Ignore TFTP server name */
884 break;
885 case 67: /* Bootfile option */
886 size = truncate_sz("Bootfile",
887 sizeof(net_boot_file_name), oplen);
888 memcpy(&net_boot_file_name, popt + 2, size);
889 net_boot_file_name[size] = 0;
890 break;
891 default:
892 #if defined(CONFIG_BOOTP_VENDOREX)
893 if (dhcp_vendorex_proc(popt))
894 break;
895 #endif
896 printf("*** Unhandled DHCP Option in OFFER/ACK:"
897 " %d\n", *popt);
898 break;
899 }
900 popt += oplen + 2; /* Process next option */
901 }
902 }
903
904 static void dhcp_packet_process_options(struct bootp_hdr *bp)
905 {
906 uchar *popt = (uchar *)&bp->bp_vend[4];
907 uchar *end = popt + BOOTP_HDR_SIZE;
908
909 if (net_read_u32((u32 *)&bp->bp_vend[0]) != htonl(BOOTP_VENDOR_MAGIC))
910 return;
911
912 dhcp_option_overload = 0;
913
914 /*
915 * The 'options' field MUST be interpreted first, 'file' next,
916 * 'sname' last.
917 */
918 dhcp_process_options(popt, end);
919
920 if (dhcp_option_overload & OVERLOAD_FILE) {
921 popt = (uchar *)bp->bp_file;
922 end = popt + sizeof(bp->bp_file);
923 dhcp_process_options(popt, end);
924 }
925
926 if (dhcp_option_overload & OVERLOAD_SNAME) {
927 popt = (uchar *)bp->bp_sname;
928 end = popt + sizeof(bp->bp_sname);
929 dhcp_process_options(popt, end);
930 }
931 }
932
933 static int dhcp_message_type(unsigned char *popt)
934 {
935 if (net_read_u32((u32 *)popt) != htonl(BOOTP_VENDOR_MAGIC))
936 return -1;
937
938 popt += 4;
939 while (*popt != 0xff) {
940 if (*popt == 53) /* DHCP Message Type */
941 return *(popt + 2);
942 if (*popt == 0) {
943 /* Pad */
944 popt += 1;
945 } else {
946 /* Scan through all options */
947 popt += *(popt + 1) + 2;
948 }
949 }
950 return -1;
951 }
952
953 static void dhcp_send_request_packet(struct bootp_hdr *bp_offer)
954 {
955 uchar *pkt, *iphdr;
956 struct bootp_hdr *bp;
957 int pktlen, iplen, extlen;
958 int eth_hdr_size;
959 struct in_addr offered_ip;
960 struct in_addr zero_ip;
961 struct in_addr bcast_ip;
962
963 debug("dhcp_send_request_packet: Sending DHCPREQUEST\n");
964 pkt = net_tx_packet;
965 memset((void *)pkt, 0, PKTSIZE);
966
967 eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
968 pkt += eth_hdr_size;
969
970 iphdr = pkt; /* We'll need this later to set proper pkt size */
971 pkt += IP_UDP_HDR_SIZE;
972
973 bp = (struct bootp_hdr *)pkt;
974 bp->bp_op = OP_BOOTREQUEST;
975 bp->bp_htype = HWT_ETHER;
976 bp->bp_hlen = HWL_ETHER;
977 bp->bp_hops = 0;
978 bp->bp_secs = htons(get_timer(bootp_start) / 1000);
979 /* Do not set the client IP, your IP, or server IP yet, since it
980 * hasn't been ACK'ed by the server yet */
981
982 /*
983 * RFC3046 requires Relay Agents to discard packets with
984 * nonzero and offered giaddr
985 */
986 zero_ip.s_addr = 0;
987 net_write_ip(&bp->bp_giaddr, zero_ip);
988
989 memcpy(bp->bp_chaddr, net_ethaddr, 6);
990 copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
991
992 /*
993 * ID is the id of the OFFER packet
994 */
995
996 net_copy_u32(&bp->bp_id, &bp_offer->bp_id);
997
998 /*
999 * Copy options from OFFER packet if present
1000 */
1001
1002 /* Copy offered IP into the parameters request list */
1003 net_copy_ip(&offered_ip, &bp_offer->bp_yiaddr);
1004 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST,
1005 dhcp_server_ip, offered_ip);
1006
1007 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
1008 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
1009 bcast_ip.s_addr = 0xFFFFFFFFL;
1010 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
1011
1012 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
1013 udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
1014 #endif /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
1015 debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
1016 net_send_packet(net_tx_packet, pktlen);
1017 }
1018
1019 /*
1020 * Handle DHCP received packets.
1021 */
1022 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
1023 unsigned src, unsigned len)
1024 {
1025 struct bootp_hdr *bp = (struct bootp_hdr *)pkt;
1026
1027 debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
1028 src, dest, len, dhcp_state);
1029
1030 /* Filter out pkts we don't want */
1031 if (check_reply_packet(pkt, dest, src, len))
1032 return;
1033
1034 debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: "
1035 "%d\n", src, dest, len, dhcp_state);
1036
1037 if (net_read_ip(&bp->bp_yiaddr).s_addr == 0)
1038 return;
1039
1040 switch (dhcp_state) {
1041 case SELECTING:
1042 /*
1043 * Wait an appropriate time for any potential DHCPOFFER packets
1044 * to arrive. Then select one, and generate DHCPREQUEST
1045 * response. If filename is in format we recognize, assume it
1046 * is a valid OFFER from a server we want.
1047 */
1048 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
1049 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
1050 if (strncmp(bp->bp_file,
1051 CONFIG_SYS_BOOTFILE_PREFIX,
1052 strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) {
1053 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */
1054 dhcp_packet_process_options(bp);
1055 efi_net_set_dhcp_ack(pkt, len);
1056
1057 debug("TRANSITIONING TO REQUESTING STATE\n");
1058 dhcp_state = REQUESTING;
1059
1060 net_set_timeout_handler(5000, bootp_timeout_handler);
1061 dhcp_send_request_packet(bp);
1062 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
1063 }
1064 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */
1065
1066 return;
1067 break;
1068 case REQUESTING:
1069 debug("DHCP State: REQUESTING\n");
1070
1071 if (dhcp_message_type((u8 *)bp->bp_vend) == DHCP_ACK) {
1072 dhcp_packet_process_options(bp);
1073 /* Store net params from reply */
1074 store_net_params(bp);
1075 dhcp_state = BOUND;
1076 printf("DHCP client bound to address %pI4 (%lu ms)\n",
1077 &net_ip, get_timer(bootp_start));
1078 net_set_timeout_handler(0, (thand_f *)0);
1079 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP,
1080 "bootp_stop");
1081
1082 net_auto_load();
1083 return;
1084 }
1085 break;
1086 case BOUND:
1087 /* DHCP client bound to address */
1088 break;
1089 default:
1090 puts("DHCP: INVALID STATE\n");
1091 break;
1092 }
1093 }
1094
1095 void dhcp_request(void)
1096 {
1097 bootp_request();
1098 }
1099 #endif /* CONFIG_CMD_DHCP */
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