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[project/bcm63xx/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 #ifdef CONFIG_LED_STATUS
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 !net_boot_file_name_explicit) {
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 env_set("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.s_addr)
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 char *ethrotate;
391
392 ethrotate = env_get("ethrotate");
393 if ((ethrotate && strcmp(ethrotate, "no") == 0) ||
394 net_restart_wrap) {
395 puts("\nRetry time exceeded\n");
396 net_set_state(NETLOOP_FAIL);
397 } else
398 #endif
399 {
400 puts("\nRetry time exceeded; starting again\n");
401 net_start_again();
402 }
403 } else {
404 bootp_timeout *= 2;
405 if (bootp_timeout > 2000)
406 bootp_timeout = 2000;
407 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
408 bootp_request();
409 }
410 }
411
412 #define put_vci(e, str) \
413 do { \
414 size_t vci_strlen = strlen(str); \
415 *e++ = 60; /* Vendor Class Identifier */ \
416 *e++ = vci_strlen; \
417 memcpy(e, str, vci_strlen); \
418 e += vci_strlen; \
419 } while (0)
420
421 static u8 *add_vci(u8 *e)
422 {
423 char *vci = NULL;
424 char *env_vci = env_get("bootp_vci");
425
426 #if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING)
427 vci = CONFIG_SPL_NET_VCI_STRING;
428 #elif defined(CONFIG_BOOTP_VCI_STRING)
429 vci = CONFIG_BOOTP_VCI_STRING;
430 #endif
431
432 if (env_vci)
433 vci = env_vci;
434
435 if (vci)
436 put_vci(e, vci);
437
438 return e;
439 }
440
441 /*
442 * Initialize BOOTP extension fields in the request.
443 */
444 #if defined(CONFIG_CMD_DHCP)
445 static int dhcp_extended(u8 *e, int message_type, struct in_addr server_ip,
446 struct in_addr requested_ip)
447 {
448 u8 *start = e;
449 u8 *cnt;
450 #ifdef CONFIG_LIB_UUID
451 char *uuid;
452 #endif
453 int clientarch = -1;
454
455 #if defined(CONFIG_BOOTP_VENDOREX)
456 u8 *x;
457 #endif
458 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
459 char *hostname;
460 #endif
461
462 *e++ = 99; /* RFC1048 Magic Cookie */
463 *e++ = 130;
464 *e++ = 83;
465 *e++ = 99;
466
467 *e++ = 53; /* DHCP Message Type */
468 *e++ = 1;
469 *e++ = message_type;
470
471 *e++ = 57; /* Maximum DHCP Message Size */
472 *e++ = 2;
473 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 8;
474 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
475
476 if (server_ip.s_addr) {
477 int tmp = ntohl(server_ip.s_addr);
478
479 *e++ = 54; /* ServerID */
480 *e++ = 4;
481 *e++ = tmp >> 24;
482 *e++ = tmp >> 16;
483 *e++ = tmp >> 8;
484 *e++ = tmp & 0xff;
485 }
486
487 if (requested_ip.s_addr) {
488 int tmp = ntohl(requested_ip.s_addr);
489
490 *e++ = 50; /* Requested IP */
491 *e++ = 4;
492 *e++ = tmp >> 24;
493 *e++ = tmp >> 16;
494 *e++ = tmp >> 8;
495 *e++ = tmp & 0xff;
496 }
497 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
498 hostname = env_get("hostname");
499 if (hostname) {
500 int hostnamelen = strlen(hostname);
501
502 *e++ = 12; /* Hostname */
503 *e++ = hostnamelen;
504 memcpy(e, hostname, hostnamelen);
505 e += hostnamelen;
506 }
507 #endif
508
509 #ifdef CONFIG_BOOTP_PXE_CLIENTARCH
510 clientarch = CONFIG_BOOTP_PXE_CLIENTARCH;
511 #endif
512
513 if (env_get("bootp_arch"))
514 clientarch = env_get_ulong("bootp_arch", 16, clientarch);
515
516 if (clientarch > 0) {
517 *e++ = 93; /* Client System Architecture */
518 *e++ = 2;
519 *e++ = (clientarch >> 8) & 0xff;
520 *e++ = clientarch & 0xff;
521 }
522
523 *e++ = 94; /* Client Network Interface Identifier */
524 *e++ = 3;
525 *e++ = 1; /* type field for UNDI */
526 *e++ = 0; /* major revision */
527 *e++ = 0; /* minor revision */
528
529 #ifdef CONFIG_LIB_UUID
530 uuid = env_get("pxeuuid");
531
532 if (uuid) {
533 if (uuid_str_valid(uuid)) {
534 *e++ = 97; /* Client Machine Identifier */
535 *e++ = 17;
536 *e++ = 0; /* type 0 - UUID */
537
538 uuid_str_to_bin(uuid, e, UUID_STR_FORMAT_STD);
539 e += 16;
540 } else {
541 printf("Invalid pxeuuid: %s\n", uuid);
542 }
543 }
544 #endif
545
546 e = add_vci(e);
547
548 #if defined(CONFIG_BOOTP_VENDOREX)
549 x = dhcp_vendorex_prep(e);
550 if (x)
551 return x - start;
552 #endif
553
554 *e++ = 55; /* Parameter Request List */
555 cnt = e++; /* Pointer to count of requested items */
556 *cnt = 0;
557 #if defined(CONFIG_BOOTP_SUBNETMASK)
558 *e++ = 1; /* Subnet Mask */
559 *cnt += 1;
560 #endif
561 #if defined(CONFIG_BOOTP_TIMEOFFSET)
562 *e++ = 2;
563 *cnt += 1;
564 #endif
565 #if defined(CONFIG_BOOTP_GATEWAY)
566 *e++ = 3; /* Router Option */
567 *cnt += 1;
568 #endif
569 #if defined(CONFIG_BOOTP_DNS)
570 *e++ = 6; /* DNS Server(s) */
571 *cnt += 1;
572 #endif
573 #if defined(CONFIG_BOOTP_HOSTNAME)
574 *e++ = 12; /* Hostname */
575 *cnt += 1;
576 #endif
577 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
578 *e++ = 13; /* Boot File Size */
579 *cnt += 1;
580 #endif
581 #if defined(CONFIG_BOOTP_BOOTPATH)
582 *e++ = 17; /* Boot path */
583 *cnt += 1;
584 #endif
585 #if defined(CONFIG_BOOTP_NISDOMAIN)
586 *e++ = 40; /* NIS Domain name request */
587 *cnt += 1;
588 #endif
589 #if defined(CONFIG_BOOTP_NTPSERVER)
590 *e++ = 42;
591 *cnt += 1;
592 #endif
593 /* no options, so back up to avoid sending an empty request list */
594 if (*cnt == 0)
595 e -= 2;
596
597 *e++ = 255; /* End of the list */
598
599 /* Pad to minimal length */
600 #ifdef CONFIG_DHCP_MIN_EXT_LEN
601 while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN)
602 *e++ = 0;
603 #endif
604
605 return e - start;
606 }
607
608 #else
609 /*
610 * Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
611 */
612 static int bootp_extended(u8 *e)
613 {
614 u8 *start = e;
615
616 *e++ = 99; /* RFC1048 Magic Cookie */
617 *e++ = 130;
618 *e++ = 83;
619 *e++ = 99;
620
621 #if defined(CONFIG_CMD_DHCP)
622 *e++ = 53; /* DHCP Message Type */
623 *e++ = 1;
624 *e++ = DHCP_DISCOVER;
625
626 *e++ = 57; /* Maximum DHCP Message Size */
627 *e++ = 2;
628 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 16;
629 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
630 #endif
631
632 add_vci(e);
633
634 #if defined(CONFIG_BOOTP_SUBNETMASK)
635 *e++ = 1; /* Subnet mask request */
636 *e++ = 4;
637 e += 4;
638 #endif
639
640 #if defined(CONFIG_BOOTP_GATEWAY)
641 *e++ = 3; /* Default gateway request */
642 *e++ = 4;
643 e += 4;
644 #endif
645
646 #if defined(CONFIG_BOOTP_DNS)
647 *e++ = 6; /* Domain Name Server */
648 *e++ = 4;
649 e += 4;
650 #endif
651
652 #if defined(CONFIG_BOOTP_HOSTNAME)
653 *e++ = 12; /* Host name request */
654 *e++ = 32;
655 e += 32;
656 #endif
657
658 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
659 *e++ = 13; /* Boot file size */
660 *e++ = 2;
661 e += 2;
662 #endif
663
664 #if defined(CONFIG_BOOTP_BOOTPATH)
665 *e++ = 17; /* Boot path */
666 *e++ = 32;
667 e += 32;
668 #endif
669
670 #if defined(CONFIG_BOOTP_NISDOMAIN)
671 *e++ = 40; /* NIS Domain name request */
672 *e++ = 32;
673 e += 32;
674 #endif
675 #if defined(CONFIG_BOOTP_NTPSERVER)
676 *e++ = 42;
677 *e++ = 4;
678 e += 4;
679 #endif
680
681 *e++ = 255; /* End of the list */
682
683 /*
684 * If nothing in list, remove it altogether. Some DHCP servers get
685 * upset by this minor faux pas and do not respond at all.
686 */
687 if (e == start + 3) {
688 printf("*** Warning: no DHCP options requested\n");
689 e -= 3;
690 }
691
692 return e - start;
693 }
694 #endif
695
696 void bootp_reset(void)
697 {
698 bootp_num_ids = 0;
699 bootp_try = 0;
700 bootp_start = get_timer(0);
701 bootp_timeout = 250;
702 }
703
704 void bootp_request(void)
705 {
706 uchar *pkt, *iphdr;
707 struct bootp_hdr *bp;
708 int extlen, pktlen, iplen;
709 int eth_hdr_size;
710 #ifdef CONFIG_BOOTP_RANDOM_DELAY
711 ulong rand_ms;
712 #endif
713 u32 bootp_id;
714 struct in_addr zero_ip;
715 struct in_addr bcast_ip;
716 char *ep; /* Environment pointer */
717
718 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start");
719 #if defined(CONFIG_CMD_DHCP)
720 dhcp_state = INIT;
721 #endif
722
723 ep = env_get("bootpretryperiod");
724 if (ep != NULL)
725 time_taken_max = simple_strtoul(ep, NULL, 10);
726 else
727 time_taken_max = TIMEOUT_MS;
728
729 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */
730 if (bootp_try == 0)
731 srand_mac();
732
733 if (bootp_try <= 2) /* Start with max 1024 * 1ms */
734 rand_ms = rand() >> (22 - bootp_try);
735 else /* After 3rd BOOTP request max 8192 * 1ms */
736 rand_ms = rand() >> 19;
737
738 printf("Random delay: %ld ms...\n", rand_ms);
739 mdelay(rand_ms);
740
741 #endif /* CONFIG_BOOTP_RANDOM_DELAY */
742
743 printf("BOOTP broadcast %d\n", ++bootp_try);
744 pkt = net_tx_packet;
745 memset((void *)pkt, 0, PKTSIZE);
746
747 eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
748 pkt += eth_hdr_size;
749
750 /*
751 * Next line results in incorrect packet size being transmitted,
752 * resulting in errors in some DHCP servers, reporting missing bytes.
753 * Size must be set in packet header after extension length has been
754 * determined.
755 * C. Hallinan, DS4.COM, Inc.
756 */
757 /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC,
758 sizeof (struct bootp_hdr)); */
759 iphdr = pkt; /* We need this later for net_set_udp_header() */
760 pkt += IP_UDP_HDR_SIZE;
761
762 bp = (struct bootp_hdr *)pkt;
763 bp->bp_op = OP_BOOTREQUEST;
764 bp->bp_htype = HWT_ETHER;
765 bp->bp_hlen = HWL_ETHER;
766 bp->bp_hops = 0;
767 /*
768 * according to RFC1542, should be 0 on first request, secs since
769 * first request otherwise
770 */
771 bp->bp_secs = htons(get_timer(bootp_start) / 1000);
772 zero_ip.s_addr = 0;
773 net_write_ip(&bp->bp_ciaddr, zero_ip);
774 net_write_ip(&bp->bp_yiaddr, zero_ip);
775 net_write_ip(&bp->bp_siaddr, zero_ip);
776 net_write_ip(&bp->bp_giaddr, zero_ip);
777 memcpy(bp->bp_chaddr, net_ethaddr, 6);
778 copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
779
780 /* Request additional information from the BOOTP/DHCP server */
781 #if defined(CONFIG_CMD_DHCP)
782 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_DISCOVER, zero_ip,
783 zero_ip);
784 #else
785 extlen = bootp_extended((u8 *)bp->bp_vend);
786 #endif
787
788 /*
789 * Bootp ID is the lower 4 bytes of our ethernet address
790 * plus the current time in ms.
791 */
792 bootp_id = ((u32)net_ethaddr[2] << 24)
793 | ((u32)net_ethaddr[3] << 16)
794 | ((u32)net_ethaddr[4] << 8)
795 | (u32)net_ethaddr[5];
796 bootp_id += get_timer(0);
797 bootp_id = htonl(bootp_id);
798 bootp_add_id(bootp_id);
799 net_copy_u32(&bp->bp_id, &bootp_id);
800
801 /*
802 * Calculate proper packet lengths taking into account the
803 * variable size of the options field
804 */
805 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
806 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
807 bcast_ip.s_addr = 0xFFFFFFFFL;
808 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
809 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
810
811 #if defined(CONFIG_CMD_DHCP)
812 dhcp_state = SELECTING;
813 net_set_udp_handler(dhcp_handler);
814 #else
815 net_set_udp_handler(bootp_handler);
816 #endif
817 net_send_packet(net_tx_packet, pktlen);
818 }
819
820 #if defined(CONFIG_CMD_DHCP)
821 static void dhcp_process_options(uchar *popt, uchar *end)
822 {
823 int oplen, size;
824 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
825 int *to_ptr;
826 #endif
827
828 while (popt < end && *popt != 0xff) {
829 oplen = *(popt + 1);
830 switch (*popt) {
831 case 0:
832 oplen = -1; /* Pad omits len byte */
833 break;
834 case 1:
835 net_copy_ip(&net_netmask, (popt + 2));
836 break;
837 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
838 case 2: /* Time offset */
839 to_ptr = &net_ntp_time_offset;
840 net_copy_u32((u32 *)to_ptr, (u32 *)(popt + 2));
841 net_ntp_time_offset = ntohl(net_ntp_time_offset);
842 break;
843 #endif
844 case 3:
845 net_copy_ip(&net_gateway, (popt + 2));
846 break;
847 case 6:
848 net_copy_ip(&net_dns_server, (popt + 2));
849 #if defined(CONFIG_BOOTP_DNS2)
850 if (*(popt + 1) > 4)
851 net_copy_ip(&net_dns_server2, (popt + 2 + 4));
852 #endif
853 break;
854 case 12:
855 size = truncate_sz("Host Name",
856 sizeof(net_hostname), oplen);
857 memcpy(&net_hostname, popt + 2, size);
858 net_hostname[size] = 0;
859 break;
860 case 15: /* Ignore Domain Name Option */
861 break;
862 case 17:
863 size = truncate_sz("Root Path",
864 sizeof(net_root_path), oplen);
865 memcpy(&net_root_path, popt + 2, size);
866 net_root_path[size] = 0;
867 break;
868 case 28: /* Ignore Broadcast Address Option */
869 break;
870 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
871 case 42: /* NTP server IP */
872 net_copy_ip(&net_ntp_server, (popt + 2));
873 break;
874 #endif
875 case 51:
876 net_copy_u32(&dhcp_leasetime, (u32 *)(popt + 2));
877 break;
878 case 52:
879 dhcp_option_overload = popt[2];
880 break;
881 case 53: /* Ignore Message Type Option */
882 break;
883 case 54:
884 net_copy_ip(&dhcp_server_ip, (popt + 2));
885 break;
886 case 58: /* Ignore Renewal Time Option */
887 break;
888 case 59: /* Ignore Rebinding Time Option */
889 break;
890 case 66: /* Ignore TFTP server name */
891 break;
892 case 67: /* Bootfile option */
893 if (!net_boot_file_name_explicit) {
894 size = truncate_sz("Bootfile",
895 sizeof(net_boot_file_name),
896 oplen);
897 memcpy(&net_boot_file_name, popt + 2, size);
898 net_boot_file_name[size] = 0;
899 }
900 break;
901 default:
902 #if defined(CONFIG_BOOTP_VENDOREX)
903 if (dhcp_vendorex_proc(popt))
904 break;
905 #endif
906 printf("*** Unhandled DHCP Option in OFFER/ACK:"
907 " %d\n", *popt);
908 break;
909 }
910 popt += oplen + 2; /* Process next option */
911 }
912 }
913
914 static void dhcp_packet_process_options(struct bootp_hdr *bp)
915 {
916 uchar *popt = (uchar *)&bp->bp_vend[4];
917 uchar *end = popt + BOOTP_HDR_SIZE;
918
919 if (net_read_u32((u32 *)&bp->bp_vend[0]) != htonl(BOOTP_VENDOR_MAGIC))
920 return;
921
922 dhcp_option_overload = 0;
923
924 /*
925 * The 'options' field MUST be interpreted first, 'file' next,
926 * 'sname' last.
927 */
928 dhcp_process_options(popt, end);
929
930 if (dhcp_option_overload & OVERLOAD_FILE) {
931 popt = (uchar *)bp->bp_file;
932 end = popt + sizeof(bp->bp_file);
933 dhcp_process_options(popt, end);
934 }
935
936 if (dhcp_option_overload & OVERLOAD_SNAME) {
937 popt = (uchar *)bp->bp_sname;
938 end = popt + sizeof(bp->bp_sname);
939 dhcp_process_options(popt, end);
940 }
941 }
942
943 static int dhcp_message_type(unsigned char *popt)
944 {
945 if (net_read_u32((u32 *)popt) != htonl(BOOTP_VENDOR_MAGIC))
946 return -1;
947
948 popt += 4;
949 while (*popt != 0xff) {
950 if (*popt == 53) /* DHCP Message Type */
951 return *(popt + 2);
952 if (*popt == 0) {
953 /* Pad */
954 popt += 1;
955 } else {
956 /* Scan through all options */
957 popt += *(popt + 1) + 2;
958 }
959 }
960 return -1;
961 }
962
963 static void dhcp_send_request_packet(struct bootp_hdr *bp_offer)
964 {
965 uchar *pkt, *iphdr;
966 struct bootp_hdr *bp;
967 int pktlen, iplen, extlen;
968 int eth_hdr_size;
969 struct in_addr offered_ip;
970 struct in_addr zero_ip;
971 struct in_addr bcast_ip;
972
973 debug("dhcp_send_request_packet: Sending DHCPREQUEST\n");
974 pkt = net_tx_packet;
975 memset((void *)pkt, 0, PKTSIZE);
976
977 eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
978 pkt += eth_hdr_size;
979
980 iphdr = pkt; /* We'll need this later to set proper pkt size */
981 pkt += IP_UDP_HDR_SIZE;
982
983 bp = (struct bootp_hdr *)pkt;
984 bp->bp_op = OP_BOOTREQUEST;
985 bp->bp_htype = HWT_ETHER;
986 bp->bp_hlen = HWL_ETHER;
987 bp->bp_hops = 0;
988 bp->bp_secs = htons(get_timer(bootp_start) / 1000);
989 /* Do not set the client IP, your IP, or server IP yet, since it
990 * hasn't been ACK'ed by the server yet */
991
992 /*
993 * RFC3046 requires Relay Agents to discard packets with
994 * nonzero and offered giaddr
995 */
996 zero_ip.s_addr = 0;
997 net_write_ip(&bp->bp_giaddr, zero_ip);
998
999 memcpy(bp->bp_chaddr, net_ethaddr, 6);
1000 copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
1001
1002 /*
1003 * ID is the id of the OFFER packet
1004 */
1005
1006 net_copy_u32(&bp->bp_id, &bp_offer->bp_id);
1007
1008 /*
1009 * Copy options from OFFER packet if present
1010 */
1011
1012 /* Copy offered IP into the parameters request list */
1013 net_copy_ip(&offered_ip, &bp_offer->bp_yiaddr);
1014 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST,
1015 dhcp_server_ip, offered_ip);
1016
1017 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
1018 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
1019 bcast_ip.s_addr = 0xFFFFFFFFL;
1020 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
1021
1022 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
1023 udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
1024 #endif /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
1025 debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
1026 net_send_packet(net_tx_packet, pktlen);
1027 }
1028
1029 /*
1030 * Handle DHCP received packets.
1031 */
1032 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
1033 unsigned src, unsigned len)
1034 {
1035 struct bootp_hdr *bp = (struct bootp_hdr *)pkt;
1036
1037 debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
1038 src, dest, len, dhcp_state);
1039
1040 /* Filter out pkts we don't want */
1041 if (check_reply_packet(pkt, dest, src, len))
1042 return;
1043
1044 debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: "
1045 "%d\n", src, dest, len, dhcp_state);
1046
1047 if (net_read_ip(&bp->bp_yiaddr).s_addr == 0)
1048 return;
1049
1050 switch (dhcp_state) {
1051 case SELECTING:
1052 /*
1053 * Wait an appropriate time for any potential DHCPOFFER packets
1054 * to arrive. Then select one, and generate DHCPREQUEST
1055 * response. If filename is in format we recognize, assume it
1056 * is a valid OFFER from a server we want.
1057 */
1058 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
1059 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
1060 if (strncmp(bp->bp_file,
1061 CONFIG_SYS_BOOTFILE_PREFIX,
1062 strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) {
1063 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */
1064 dhcp_packet_process_options(bp);
1065 efi_net_set_dhcp_ack(pkt, len);
1066
1067 debug("TRANSITIONING TO REQUESTING STATE\n");
1068 dhcp_state = REQUESTING;
1069
1070 net_set_timeout_handler(5000, bootp_timeout_handler);
1071 dhcp_send_request_packet(bp);
1072 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
1073 }
1074 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */
1075
1076 return;
1077 break;
1078 case REQUESTING:
1079 debug("DHCP State: REQUESTING\n");
1080
1081 if (dhcp_message_type((u8 *)bp->bp_vend) == DHCP_ACK) {
1082 dhcp_packet_process_options(bp);
1083 /* Store net params from reply */
1084 store_net_params(bp);
1085 dhcp_state = BOUND;
1086 printf("DHCP client bound to address %pI4 (%lu ms)\n",
1087 &net_ip, get_timer(bootp_start));
1088 net_set_timeout_handler(0, (thand_f *)0);
1089 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP,
1090 "bootp_stop");
1091
1092 net_auto_load();
1093 return;
1094 }
1095 break;
1096 case BOUND:
1097 /* DHCP client bound to address */
1098 break;
1099 default:
1100 puts("DHCP: INVALID STATE\n");
1101 break;
1102 }
1103 }
1104
1105 void dhcp_request(void)
1106 {
1107 bootp_request();
1108 }
1109 #endif /* CONFIG_CMD_DHCP */
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