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 <bootstage.h>
13 #include <command.h>
14 #include <env.h>
15 #include <efi_loader.h>
16 #include <log.h>
17 #include <net.h>
18 #include <rand.h>
19 #include <uuid.h>
20 #include <linux/delay.h>
21 #include <net/tftp.h>
22 #include "bootp.h"
23 #ifdef CONFIG_LED_STATUS
24 #include <status_led.h>
25 #endif
26 #ifdef CONFIG_BOOTP_RANDOM_DELAY
27 #include "net_rand.h"
28 #endif
29
30 #define BOOTP_VENDOR_MAGIC 0x63825363 /* RFC1048 Magic Cookie */
31
32 /*
33 * The timeout for the initial BOOTP/DHCP request used to be described by a
34 * counter of fixed-length timeout periods. TIMEOUT_COUNT represents
35 * that counter
36 *
37 * Now that the timeout periods are variable (exponential backoff and retry)
38 * we convert the timeout count to the absolute time it would have take to
39 * execute that many retries, and keep sending retry packets until that time
40 * is reached.
41 */
42 #ifndef CONFIG_NET_RETRY_COUNT
43 # define TIMEOUT_COUNT 5 /* # of timeouts before giving up */
44 #else
45 # define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT)
46 #endif
47 #define TIMEOUT_MS ((3 + (TIMEOUT_COUNT * 5)) * 1000)
48
49 #define PORT_BOOTPS 67 /* BOOTP server UDP port */
50 #define PORT_BOOTPC 68 /* BOOTP client UDP port */
51
52 #ifndef CONFIG_DHCP_MIN_EXT_LEN /* minimal length of extension list */
53 #define CONFIG_DHCP_MIN_EXT_LEN 64
54 #endif
55
56 #ifndef CONFIG_BOOTP_ID_CACHE_SIZE
57 #define CONFIG_BOOTP_ID_CACHE_SIZE 4
58 #endif
59
60 u32 bootp_ids[CONFIG_BOOTP_ID_CACHE_SIZE];
61 unsigned int bootp_num_ids;
62 int bootp_try;
63 ulong bootp_start;
64 ulong bootp_timeout;
65 char net_nis_domain[32] = {0,}; /* Our NIS domain */
66 char net_hostname[32] = {0,}; /* Our hostname */
67 char net_root_path[64] = {0,}; /* Our bootpath */
68
69 static ulong time_taken_max;
70
71 #if defined(CONFIG_CMD_DHCP)
72 static dhcp_state_t dhcp_state = INIT;
73 static u32 dhcp_leasetime;
74 static struct in_addr dhcp_server_ip;
75 static u8 dhcp_option_overload;
76 #define OVERLOAD_FILE 1
77 #define OVERLOAD_SNAME 2
78 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
79 unsigned src, unsigned len);
80
81 /* For Debug */
82 #if 0
83 static char *dhcpmsg2str(int type)
84 {
85 switch (type) {
86 case 1: return "DHCPDISCOVER"; break;
87 case 2: return "DHCPOFFER"; break;
88 case 3: return "DHCPREQUEST"; break;
89 case 4: return "DHCPDECLINE"; break;
90 case 5: return "DHCPACK"; break;
91 case 6: return "DHCPNACK"; break;
92 case 7: return "DHCPRELEASE"; break;
93 default: return "UNKNOWN/INVALID MSG TYPE"; break;
94 }
95 }
96 #endif
97 #endif
98
bootp_add_id(ulong id)99 static void bootp_add_id(ulong id)
100 {
101 if (bootp_num_ids >= ARRAY_SIZE(bootp_ids)) {
102 size_t size = sizeof(bootp_ids) - sizeof(id);
103
104 memmove(bootp_ids, &bootp_ids[1], size);
105 bootp_ids[bootp_num_ids - 1] = id;
106 } else {
107 bootp_ids[bootp_num_ids] = id;
108 bootp_num_ids++;
109 }
110 }
111
bootp_match_id(ulong id)112 static bool bootp_match_id(ulong id)
113 {
114 unsigned int i;
115
116 for (i = 0; i < bootp_num_ids; i++)
117 if (bootp_ids[i] == id)
118 return true;
119
120 return false;
121 }
122
check_reply_packet(uchar * pkt,unsigned dest,unsigned src,unsigned len)123 static int check_reply_packet(uchar *pkt, unsigned dest, unsigned src,
124 unsigned len)
125 {
126 struct bootp_hdr *bp = (struct bootp_hdr *)pkt;
127 int retval = 0;
128
129 if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
130 retval = -1;
131 else if (len < sizeof(struct bootp_hdr) - OPT_FIELD_SIZE)
132 retval = -2;
133 else if (bp->bp_op != OP_BOOTREPLY)
134 retval = -3;
135 else if (bp->bp_htype != HWT_ETHER)
136 retval = -4;
137 else if (bp->bp_hlen != HWL_ETHER)
138 retval = -5;
139 else if (!bootp_match_id(net_read_u32(&bp->bp_id)))
140 retval = -6;
141 else if (memcmp(bp->bp_chaddr, net_ethaddr, HWL_ETHER) != 0)
142 retval = -7;
143
144 debug("Filtering pkt = %d\n", retval);
145
146 return retval;
147 }
148
store_bootp_params(struct bootp_hdr * bp)149 static void store_bootp_params(struct bootp_hdr *bp)
150 {
151 #if !defined(CONFIG_BOOTP_SERVERIP)
152 struct in_addr tmp_ip;
153 bool overwrite_serverip = true;
154
155 #if defined(CONFIG_BOOTP_PREFER_SERVERIP)
156 overwrite_serverip = false;
157 #endif
158
159 net_copy_ip(&tmp_ip, &bp->bp_siaddr);
160 if (tmp_ip.s_addr != 0 && (overwrite_serverip || !net_server_ip.s_addr))
161 net_copy_ip(&net_server_ip, &bp->bp_siaddr);
162 memcpy(net_server_ethaddr,
163 ((struct ethernet_hdr *)net_rx_packet)->et_src, 6);
164 if (
165 #if defined(CONFIG_CMD_DHCP)
166 !(dhcp_option_overload & OVERLOAD_FILE) &&
167 #endif
168 (strlen(bp->bp_file) > 0) &&
169 !net_boot_file_name_explicit) {
170 copy_filename(net_boot_file_name, bp->bp_file,
171 sizeof(net_boot_file_name));
172 }
173
174 debug("net_boot_file_name: %s\n", net_boot_file_name);
175
176 /* Propagate to environment:
177 * don't delete exising entry when BOOTP / DHCP reply does
178 * not contain a new value
179 */
180 if (*net_boot_file_name)
181 env_set("bootfile", net_boot_file_name);
182 #endif
183 }
184
185 /*
186 * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet
187 */
store_net_params(struct bootp_hdr * bp)188 static void store_net_params(struct bootp_hdr *bp)
189 {
190 #if !defined(CONFIG_SERVERIP_FROM_PROXYDHCP)
191 store_bootp_params(bp);
192 #endif
193 net_copy_ip(&net_ip, &bp->bp_yiaddr);
194 }
195
truncate_sz(const char * name,int maxlen,int curlen)196 static int truncate_sz(const char *name, int maxlen, int curlen)
197 {
198 if (curlen >= maxlen) {
199 printf("*** WARNING: %s is too long (%d - max: %d)"
200 " - truncated\n", name, curlen, maxlen);
201 curlen = maxlen - 1;
202 }
203 return curlen;
204 }
205
206 #if !defined(CONFIG_CMD_DHCP)
207
bootp_process_vendor_field(u8 * ext)208 static void bootp_process_vendor_field(u8 *ext)
209 {
210 int size = *(ext + 1);
211
212 debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext,
213 *(ext + 1));
214
215 net_boot_file_expected_size_in_blocks = 0;
216
217 switch (*ext) {
218 /* Fixed length fields */
219 case 1: /* Subnet mask */
220 if (net_netmask.s_addr == 0)
221 net_copy_ip(&net_netmask, (struct in_addr *)(ext + 2));
222 break;
223 case 2: /* Time offset - Not yet supported */
224 break;
225 /* Variable length fields */
226 case 3: /* Gateways list */
227 if (net_gateway.s_addr == 0)
228 net_copy_ip(&net_gateway, (struct in_addr *)(ext + 2));
229 break;
230 case 4: /* Time server - Not yet supported */
231 break;
232 case 5: /* IEN-116 name server - Not yet supported */
233 break;
234 case 6:
235 if (net_dns_server.s_addr == 0)
236 net_copy_ip(&net_dns_server,
237 (struct in_addr *)(ext + 2));
238 #if defined(CONFIG_BOOTP_DNS2)
239 if ((net_dns_server2.s_addr == 0) && (size > 4))
240 net_copy_ip(&net_dns_server2,
241 (struct in_addr *)(ext + 2 + 4));
242 #endif
243 break;
244 case 7: /* Log server - Not yet supported */
245 break;
246 case 8: /* Cookie/Quote server - Not yet supported */
247 break;
248 case 9: /* LPR server - Not yet supported */
249 break;
250 case 10: /* Impress server - Not yet supported */
251 break;
252 case 11: /* RPL server - Not yet supported */
253 break;
254 case 12: /* Host name */
255 if (net_hostname[0] == 0) {
256 size = truncate_sz("Host Name",
257 sizeof(net_hostname), size);
258 memcpy(&net_hostname, ext + 2, size);
259 net_hostname[size] = 0;
260 }
261 break;
262 case 13: /* Boot file size */
263 if (size == 2)
264 net_boot_file_expected_size_in_blocks =
265 ntohs(*(ushort *)(ext + 2));
266 else if (size == 4)
267 net_boot_file_expected_size_in_blocks =
268 ntohl(*(ulong *)(ext + 2));
269 break;
270 case 14: /* Merit dump file - Not yet supported */
271 break;
272 case 15: /* Domain name - Not yet supported */
273 break;
274 case 16: /* Swap server - Not yet supported */
275 break;
276 case 17: /* Root path */
277 if (net_root_path[0] == 0) {
278 size = truncate_sz("Root Path",
279 sizeof(net_root_path), size);
280 memcpy(&net_root_path, ext + 2, size);
281 net_root_path[size] = 0;
282 }
283 break;
284 case 18: /* Extension path - Not yet supported */
285 /*
286 * This can be used to send the information of the
287 * vendor area in another file that the client can
288 * access via TFTP.
289 */
290 break;
291 /* IP host layer fields */
292 case 40: /* NIS Domain name */
293 if (net_nis_domain[0] == 0) {
294 size = truncate_sz("NIS Domain Name",
295 sizeof(net_nis_domain), size);
296 memcpy(&net_nis_domain, ext + 2, size);
297 net_nis_domain[size] = 0;
298 }
299 break;
300 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
301 case 42: /* NTP server IP */
302 net_copy_ip(&net_ntp_server, (struct in_addr *)(ext + 2));
303 break;
304 #endif
305 /* Application layer fields */
306 case 43: /* Vendor specific info - Not yet supported */
307 /*
308 * Binary information to exchange specific
309 * product information.
310 */
311 break;
312 /* Reserved (custom) fields (128..254) */
313 }
314 }
315
bootp_process_vendor(u8 * ext,int size)316 static void bootp_process_vendor(u8 *ext, int size)
317 {
318 u8 *end = ext + size;
319
320 debug("[BOOTP] Checking extension (%d bytes)...\n", size);
321
322 while ((ext < end) && (*ext != 0xff)) {
323 if (*ext == 0) {
324 ext++;
325 } else {
326 u8 *opt = ext;
327
328 ext += ext[1] + 2;
329 if (ext <= end)
330 bootp_process_vendor_field(opt);
331 }
332 }
333
334 debug("[BOOTP] Received fields:\n");
335 if (net_netmask.s_addr)
336 debug("net_netmask : %pI4\n", &net_netmask);
337
338 if (net_gateway.s_addr)
339 debug("net_gateway : %pI4", &net_gateway);
340
341 if (net_boot_file_expected_size_in_blocks)
342 debug("net_boot_file_expected_size_in_blocks : %d\n",
343 net_boot_file_expected_size_in_blocks);
344
345 if (net_hostname[0])
346 debug("net_hostname : %s\n", net_hostname);
347
348 if (net_root_path[0])
349 debug("net_root_path : %s\n", net_root_path);
350
351 if (net_nis_domain[0])
352 debug("net_nis_domain : %s\n", net_nis_domain);
353
354 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
355 if (net_ntp_server.s_addr)
356 debug("net_ntp_server : %pI4\n", &net_ntp_server);
357 #endif
358 }
359
360 /*
361 * Handle a BOOTP received packet.
362 */
bootp_handler(uchar * pkt,unsigned dest,struct in_addr sip,unsigned src,unsigned len)363 static void bootp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
364 unsigned src, unsigned len)
365 {
366 struct bootp_hdr *bp;
367
368 debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n",
369 src, dest, len, sizeof(struct bootp_hdr));
370
371 bp = (struct bootp_hdr *)pkt;
372
373 /* Filter out pkts we don't want */
374 if (check_reply_packet(pkt, dest, src, len))
375 return;
376
377 /*
378 * Got a good BOOTP reply. Copy the data into our variables.
379 */
380 #if defined(CONFIG_LED_STATUS) && defined(CONFIG_LED_STATUS_BOOT_ENABLE)
381 status_led_set(CONFIG_LED_STATUS_BOOT, CONFIG_LED_STATUS_OFF);
382 #endif
383
384 store_net_params(bp); /* Store net parameters from reply */
385
386 /* Retrieve extended information (we must parse the vendor area) */
387 if (net_read_u32((u32 *)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
388 bootp_process_vendor((uchar *)&bp->bp_vend[4], len);
389
390 net_set_timeout_handler(0, (thand_f *)0);
391 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop");
392
393 debug("Got good BOOTP\n");
394
395 net_auto_load();
396 }
397 #endif
398
399 /*
400 * Timeout on BOOTP/DHCP request.
401 */
bootp_timeout_handler(void)402 static void bootp_timeout_handler(void)
403 {
404 ulong time_taken = get_timer(bootp_start);
405
406 if (time_taken >= time_taken_max) {
407 #ifdef CONFIG_BOOTP_MAY_FAIL
408 char *ethrotate;
409
410 ethrotate = env_get("ethrotate");
411 if ((ethrotate && strcmp(ethrotate, "no") == 0) ||
412 net_restart_wrap) {
413 puts("\nRetry time exceeded\n");
414 net_set_state(NETLOOP_FAIL);
415 } else
416 #endif
417 {
418 puts("\nRetry time exceeded; starting again\n");
419 net_start_again();
420 }
421 } else {
422 bootp_timeout *= 2;
423 if (bootp_timeout > 2000)
424 bootp_timeout = 2000;
425 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
426 bootp_request();
427 }
428 }
429
430 #define put_vci(e, str) \
431 do { \
432 size_t vci_strlen = strlen(str); \
433 *e++ = 60; /* Vendor Class Identifier */ \
434 *e++ = vci_strlen; \
435 memcpy(e, str, vci_strlen); \
436 e += vci_strlen; \
437 } while (0)
438
add_vci(u8 * e)439 static u8 *add_vci(u8 *e)
440 {
441 char *vci = NULL;
442 char *env_vci = env_get("bootp_vci");
443
444 #if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING)
445 vci = CONFIG_SPL_NET_VCI_STRING;
446 #elif defined(CONFIG_BOOTP_VCI_STRING)
447 vci = CONFIG_BOOTP_VCI_STRING;
448 #endif
449
450 if (env_vci)
451 vci = env_vci;
452
453 if (vci)
454 put_vci(e, vci);
455
456 return e;
457 }
458
459 /*
460 * Initialize BOOTP extension fields in the request.
461 */
462 #if defined(CONFIG_CMD_DHCP)
dhcp_extended(u8 * e,int message_type,struct in_addr server_ip,struct in_addr requested_ip)463 static int dhcp_extended(u8 *e, int message_type, struct in_addr server_ip,
464 struct in_addr requested_ip)
465 {
466 u8 *start = e;
467 u8 *cnt;
468 #ifdef CONFIG_LIB_UUID
469 char *uuid;
470 #endif
471 int clientarch = -1;
472
473 #if defined(CONFIG_BOOTP_VENDOREX)
474 u8 *x;
475 #endif
476 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
477 char *hostname;
478 #endif
479
480 *e++ = 99; /* RFC1048 Magic Cookie */
481 *e++ = 130;
482 *e++ = 83;
483 *e++ = 99;
484
485 *e++ = 53; /* DHCP Message Type */
486 *e++ = 1;
487 *e++ = message_type;
488
489 *e++ = 57; /* Maximum DHCP Message Size */
490 *e++ = 2;
491 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 8;
492 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
493
494 if (server_ip.s_addr) {
495 int tmp = ntohl(server_ip.s_addr);
496
497 *e++ = 54; /* ServerID */
498 *e++ = 4;
499 *e++ = tmp >> 24;
500 *e++ = tmp >> 16;
501 *e++ = tmp >> 8;
502 *e++ = tmp & 0xff;
503 }
504
505 if (requested_ip.s_addr) {
506 int tmp = ntohl(requested_ip.s_addr);
507
508 *e++ = 50; /* Requested IP */
509 *e++ = 4;
510 *e++ = tmp >> 24;
511 *e++ = tmp >> 16;
512 *e++ = tmp >> 8;
513 *e++ = tmp & 0xff;
514 }
515 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
516 hostname = env_get("hostname");
517 if (hostname) {
518 int hostnamelen = strlen(hostname);
519
520 *e++ = 12; /* Hostname */
521 *e++ = hostnamelen;
522 memcpy(e, hostname, hostnamelen);
523 e += hostnamelen;
524 }
525 #endif
526
527 #ifdef CONFIG_BOOTP_PXE_CLIENTARCH
528 clientarch = CONFIG_BOOTP_PXE_CLIENTARCH;
529 #endif
530
531 if (env_get("bootp_arch"))
532 clientarch = env_get_ulong("bootp_arch", 16, clientarch);
533
534 if (clientarch > 0) {
535 *e++ = 93; /* Client System Architecture */
536 *e++ = 2;
537 *e++ = (clientarch >> 8) & 0xff;
538 *e++ = clientarch & 0xff;
539 }
540
541 *e++ = 94; /* Client Network Interface Identifier */
542 *e++ = 3;
543 *e++ = 1; /* type field for UNDI */
544 *e++ = 0; /* major revision */
545 *e++ = 0; /* minor revision */
546
547 #ifdef CONFIG_LIB_UUID
548 uuid = env_get("pxeuuid");
549
550 if (uuid) {
551 if (uuid_str_valid(uuid)) {
552 *e++ = 97; /* Client Machine Identifier */
553 *e++ = 17;
554 *e++ = 0; /* type 0 - UUID */
555
556 uuid_str_to_bin(uuid, e, UUID_STR_FORMAT_STD);
557 e += 16;
558 } else {
559 printf("Invalid pxeuuid: %s\n", uuid);
560 }
561 }
562 #endif
563
564 e = add_vci(e);
565
566 #if defined(CONFIG_BOOTP_VENDOREX)
567 x = dhcp_vendorex_prep(e);
568 if (x)
569 return x - start;
570 #endif
571
572 *e++ = 55; /* Parameter Request List */
573 cnt = e++; /* Pointer to count of requested items */
574 *cnt = 0;
575 #if defined(CONFIG_BOOTP_SUBNETMASK)
576 *e++ = 1; /* Subnet Mask */
577 *cnt += 1;
578 #endif
579 #if defined(CONFIG_BOOTP_TIMEOFFSET)
580 *e++ = 2;
581 *cnt += 1;
582 #endif
583 #if defined(CONFIG_BOOTP_GATEWAY)
584 *e++ = 3; /* Router Option */
585 *cnt += 1;
586 #endif
587 #if defined(CONFIG_BOOTP_DNS)
588 *e++ = 6; /* DNS Server(s) */
589 *cnt += 1;
590 #endif
591 #if defined(CONFIG_BOOTP_HOSTNAME)
592 *e++ = 12; /* Hostname */
593 *cnt += 1;
594 #endif
595 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
596 *e++ = 13; /* Boot File Size */
597 *cnt += 1;
598 #endif
599 #if defined(CONFIG_BOOTP_BOOTPATH)
600 *e++ = 17; /* Boot path */
601 *cnt += 1;
602 #endif
603 #if defined(CONFIG_BOOTP_NISDOMAIN)
604 *e++ = 40; /* NIS Domain name request */
605 *cnt += 1;
606 #endif
607 #if defined(CONFIG_BOOTP_NTPSERVER)
608 *e++ = 42;
609 *cnt += 1;
610 #endif
611 /* no options, so back up to avoid sending an empty request list */
612 if (*cnt == 0)
613 e -= 2;
614
615 *e++ = 255; /* End of the list */
616
617 /* Pad to minimal length */
618 #ifdef CONFIG_DHCP_MIN_EXT_LEN
619 while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN)
620 *e++ = 0;
621 #endif
622
623 return e - start;
624 }
625
626 #else
627 /*
628 * Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
629 */
bootp_extended(u8 * e)630 static int bootp_extended(u8 *e)
631 {
632 u8 *start = e;
633
634 *e++ = 99; /* RFC1048 Magic Cookie */
635 *e++ = 130;
636 *e++ = 83;
637 *e++ = 99;
638
639 #if defined(CONFIG_CMD_DHCP)
640 *e++ = 53; /* DHCP Message Type */
641 *e++ = 1;
642 *e++ = DHCP_DISCOVER;
643
644 *e++ = 57; /* Maximum DHCP Message Size */
645 *e++ = 2;
646 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 16;
647 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
648 #endif
649
650 add_vci(e);
651
652 #if defined(CONFIG_BOOTP_SUBNETMASK)
653 *e++ = 1; /* Subnet mask request */
654 *e++ = 4;
655 e += 4;
656 #endif
657
658 #if defined(CONFIG_BOOTP_GATEWAY)
659 *e++ = 3; /* Default gateway request */
660 *e++ = 4;
661 e += 4;
662 #endif
663
664 #if defined(CONFIG_BOOTP_DNS)
665 *e++ = 6; /* Domain Name Server */
666 *e++ = 4;
667 e += 4;
668 #endif
669
670 #if defined(CONFIG_BOOTP_HOSTNAME)
671 *e++ = 12; /* Host name request */
672 *e++ = 32;
673 e += 32;
674 #endif
675
676 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
677 *e++ = 13; /* Boot file size */
678 *e++ = 2;
679 e += 2;
680 #endif
681
682 #if defined(CONFIG_BOOTP_BOOTPATH)
683 *e++ = 17; /* Boot path */
684 *e++ = 32;
685 e += 32;
686 #endif
687
688 #if defined(CONFIG_BOOTP_NISDOMAIN)
689 *e++ = 40; /* NIS Domain name request */
690 *e++ = 32;
691 e += 32;
692 #endif
693 #if defined(CONFIG_BOOTP_NTPSERVER)
694 *e++ = 42;
695 *e++ = 4;
696 e += 4;
697 #endif
698
699 *e++ = 255; /* End of the list */
700
701 /*
702 * If nothing in list, remove it altogether. Some DHCP servers get
703 * upset by this minor faux pas and do not respond at all.
704 */
705 if (e == start + 3) {
706 printf("*** Warning: no DHCP options requested\n");
707 e -= 3;
708 }
709
710 return e - start;
711 }
712 #endif
713
bootp_reset(void)714 void bootp_reset(void)
715 {
716 bootp_num_ids = 0;
717 bootp_try = 0;
718 bootp_start = get_timer(0);
719 bootp_timeout = 250;
720 }
721
bootp_request(void)722 void bootp_request(void)
723 {
724 uchar *pkt, *iphdr;
725 struct bootp_hdr *bp;
726 int extlen, pktlen, iplen;
727 int eth_hdr_size;
728 #ifdef CONFIG_BOOTP_RANDOM_DELAY
729 ulong rand_ms;
730 #endif
731 u32 bootp_id;
732 struct in_addr zero_ip;
733 struct in_addr bcast_ip;
734 char *ep; /* Environment pointer */
735
736 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start");
737 #if defined(CONFIG_CMD_DHCP)
738 dhcp_state = INIT;
739 #endif
740
741 ep = env_get("bootpretryperiod");
742 if (ep != NULL)
743 time_taken_max = simple_strtoul(ep, NULL, 10);
744 else
745 time_taken_max = TIMEOUT_MS;
746
747 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */
748 if (bootp_try == 0)
749 srand_mac();
750
751 if (bootp_try <= 2) /* Start with max 1024 * 1ms */
752 rand_ms = rand() >> (22 - bootp_try);
753 else /* After 3rd BOOTP request max 8192 * 1ms */
754 rand_ms = rand() >> 19;
755
756 printf("Random delay: %ld ms...\n", rand_ms);
757 mdelay(rand_ms);
758
759 #endif /* CONFIG_BOOTP_RANDOM_DELAY */
760
761 printf("BOOTP broadcast %d\n", ++bootp_try);
762 pkt = net_tx_packet;
763 memset((void *)pkt, 0, PKTSIZE);
764
765 eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
766 pkt += eth_hdr_size;
767
768 /*
769 * Next line results in incorrect packet size being transmitted,
770 * resulting in errors in some DHCP servers, reporting missing bytes.
771 * Size must be set in packet header after extension length has been
772 * determined.
773 * C. Hallinan, DS4.COM, Inc.
774 */
775 /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC,
776 sizeof (struct bootp_hdr)); */
777 iphdr = pkt; /* We need this later for net_set_udp_header() */
778 pkt += IP_UDP_HDR_SIZE;
779
780 bp = (struct bootp_hdr *)pkt;
781 bp->bp_op = OP_BOOTREQUEST;
782 bp->bp_htype = HWT_ETHER;
783 bp->bp_hlen = HWL_ETHER;
784 bp->bp_hops = 0;
785 /*
786 * according to RFC1542, should be 0 on first request, secs since
787 * first request otherwise
788 */
789 bp->bp_secs = htons(get_timer(bootp_start) / 1000);
790 zero_ip.s_addr = 0;
791 net_write_ip(&bp->bp_ciaddr, zero_ip);
792 net_write_ip(&bp->bp_yiaddr, zero_ip);
793 net_write_ip(&bp->bp_siaddr, zero_ip);
794 net_write_ip(&bp->bp_giaddr, zero_ip);
795 memcpy(bp->bp_chaddr, net_ethaddr, 6);
796 copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
797
798 /* Request additional information from the BOOTP/DHCP server */
799 #if defined(CONFIG_CMD_DHCP)
800 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_DISCOVER, zero_ip,
801 zero_ip);
802 #else
803 extlen = bootp_extended((u8 *)bp->bp_vend);
804 #endif
805
806 /*
807 * Bootp ID is the lower 4 bytes of our ethernet address
808 * plus the current time in ms.
809 */
810 bootp_id = ((u32)net_ethaddr[2] << 24)
811 | ((u32)net_ethaddr[3] << 16)
812 | ((u32)net_ethaddr[4] << 8)
813 | (u32)net_ethaddr[5];
814 bootp_id += get_timer(0);
815 bootp_id = htonl(bootp_id);
816 bootp_add_id(bootp_id);
817 net_copy_u32(&bp->bp_id, &bootp_id);
818
819 /*
820 * Calculate proper packet lengths taking into account the
821 * variable size of the options field
822 */
823 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
824 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
825 bcast_ip.s_addr = 0xFFFFFFFFL;
826 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
827 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
828
829 #if defined(CONFIG_CMD_DHCP)
830 dhcp_state = SELECTING;
831 net_set_udp_handler(dhcp_handler);
832 #else
833 net_set_udp_handler(bootp_handler);
834 #endif
835 net_send_packet(net_tx_packet, pktlen);
836 }
837
838 #if defined(CONFIG_CMD_DHCP)
dhcp_process_options(uchar * popt,uchar * end)839 static void dhcp_process_options(uchar *popt, uchar *end)
840 {
841 int oplen, size;
842 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
843 int *to_ptr;
844 #endif
845
846 while (popt < end && *popt != 0xff) {
847 oplen = *(popt + 1);
848 switch (*popt) {
849 case 0:
850 oplen = -1; /* Pad omits len byte */
851 break;
852 case 1:
853 net_copy_ip(&net_netmask, (popt + 2));
854 break;
855 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
856 case 2: /* Time offset */
857 to_ptr = &net_ntp_time_offset;
858 net_copy_u32((u32 *)to_ptr, (u32 *)(popt + 2));
859 net_ntp_time_offset = ntohl(net_ntp_time_offset);
860 break;
861 #endif
862 case 3:
863 net_copy_ip(&net_gateway, (popt + 2));
864 break;
865 case 6:
866 net_copy_ip(&net_dns_server, (popt + 2));
867 #if defined(CONFIG_BOOTP_DNS2)
868 if (*(popt + 1) > 4)
869 net_copy_ip(&net_dns_server2, (popt + 2 + 4));
870 #endif
871 break;
872 case 12:
873 size = truncate_sz("Host Name",
874 sizeof(net_hostname), oplen);
875 memcpy(&net_hostname, popt + 2, size);
876 net_hostname[size] = 0;
877 break;
878 case 15: /* Ignore Domain Name Option */
879 break;
880 case 17:
881 size = truncate_sz("Root Path",
882 sizeof(net_root_path), oplen);
883 memcpy(&net_root_path, popt + 2, size);
884 net_root_path[size] = 0;
885 break;
886 case 28: /* Ignore Broadcast Address Option */
887 break;
888 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
889 case 42: /* NTP server IP */
890 net_copy_ip(&net_ntp_server, (popt + 2));
891 break;
892 #endif
893 case 51:
894 net_copy_u32(&dhcp_leasetime, (u32 *)(popt + 2));
895 break;
896 case 52:
897 dhcp_option_overload = popt[2];
898 break;
899 case 53: /* Ignore Message Type Option */
900 break;
901 case 54:
902 net_copy_ip(&dhcp_server_ip, (popt + 2));
903 break;
904 case 58: /* Ignore Renewal Time Option */
905 break;
906 case 59: /* Ignore Rebinding Time Option */
907 break;
908 case 66: /* Ignore TFTP server name */
909 break;
910 case 67: /* Bootfile option */
911 if (!net_boot_file_name_explicit) {
912 size = truncate_sz("Bootfile",
913 sizeof(net_boot_file_name),
914 oplen);
915 memcpy(&net_boot_file_name, popt + 2, size);
916 net_boot_file_name[size] = 0;
917 }
918 break;
919 default:
920 #if defined(CONFIG_BOOTP_VENDOREX)
921 if (dhcp_vendorex_proc(popt))
922 break;
923 #endif
924 printf("*** Unhandled DHCP Option in OFFER/ACK:"
925 " %d\n", *popt);
926 break;
927 }
928 popt += oplen + 2; /* Process next option */
929 }
930 }
931
dhcp_packet_process_options(struct bootp_hdr * bp)932 static void dhcp_packet_process_options(struct bootp_hdr *bp)
933 {
934 uchar *popt = (uchar *)&bp->bp_vend[4];
935 uchar *end = popt + BOOTP_HDR_SIZE;
936
937 if (net_read_u32((u32 *)&bp->bp_vend[0]) != htonl(BOOTP_VENDOR_MAGIC))
938 return;
939
940 dhcp_option_overload = 0;
941
942 /*
943 * The 'options' field MUST be interpreted first, 'file' next,
944 * 'sname' last.
945 */
946 dhcp_process_options(popt, end);
947
948 if (dhcp_option_overload & OVERLOAD_FILE) {
949 popt = (uchar *)bp->bp_file;
950 end = popt + sizeof(bp->bp_file);
951 dhcp_process_options(popt, end);
952 }
953
954 if (dhcp_option_overload & OVERLOAD_SNAME) {
955 popt = (uchar *)bp->bp_sname;
956 end = popt + sizeof(bp->bp_sname);
957 dhcp_process_options(popt, end);
958 }
959 }
960
dhcp_message_type(unsigned char * popt)961 static int dhcp_message_type(unsigned char *popt)
962 {
963 if (net_read_u32((u32 *)popt) != htonl(BOOTP_VENDOR_MAGIC))
964 return -1;
965
966 popt += 4;
967 while (*popt != 0xff) {
968 if (*popt == 53) /* DHCP Message Type */
969 return *(popt + 2);
970 if (*popt == 0) {
971 /* Pad */
972 popt += 1;
973 } else {
974 /* Scan through all options */
975 popt += *(popt + 1) + 2;
976 }
977 }
978 return -1;
979 }
980
dhcp_send_request_packet(struct bootp_hdr * bp_offer)981 static void dhcp_send_request_packet(struct bootp_hdr *bp_offer)
982 {
983 uchar *pkt, *iphdr;
984 struct bootp_hdr *bp;
985 int pktlen, iplen, extlen;
986 int eth_hdr_size;
987 struct in_addr offered_ip;
988 struct in_addr zero_ip;
989 struct in_addr bcast_ip;
990
991 debug("dhcp_send_request_packet: Sending DHCPREQUEST\n");
992 pkt = net_tx_packet;
993 memset((void *)pkt, 0, PKTSIZE);
994
995 eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
996 pkt += eth_hdr_size;
997
998 iphdr = pkt; /* We'll need this later to set proper pkt size */
999 pkt += IP_UDP_HDR_SIZE;
1000
1001 bp = (struct bootp_hdr *)pkt;
1002 bp->bp_op = OP_BOOTREQUEST;
1003 bp->bp_htype = HWT_ETHER;
1004 bp->bp_hlen = HWL_ETHER;
1005 bp->bp_hops = 0;
1006 bp->bp_secs = htons(get_timer(bootp_start) / 1000);
1007 /* Do not set the client IP, your IP, or server IP yet, since it
1008 * hasn't been ACK'ed by the server yet */
1009
1010 /*
1011 * RFC3046 requires Relay Agents to discard packets with
1012 * nonzero and offered giaddr
1013 */
1014 zero_ip.s_addr = 0;
1015 net_write_ip(&bp->bp_giaddr, zero_ip);
1016
1017 memcpy(bp->bp_chaddr, net_ethaddr, 6);
1018 copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
1019
1020 /*
1021 * ID is the id of the OFFER packet
1022 */
1023
1024 net_copy_u32(&bp->bp_id, &bp_offer->bp_id);
1025
1026 /*
1027 * Copy options from OFFER packet if present
1028 */
1029
1030 /* Copy offered IP into the parameters request list */
1031 net_copy_ip(&offered_ip, &bp_offer->bp_yiaddr);
1032 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST,
1033 dhcp_server_ip, offered_ip);
1034
1035 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
1036 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
1037 bcast_ip.s_addr = 0xFFFFFFFFL;
1038 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
1039
1040 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
1041 udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
1042 #endif /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
1043 debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
1044 net_send_packet(net_tx_packet, pktlen);
1045 }
1046
1047 /*
1048 * Handle DHCP received packets.
1049 */
dhcp_handler(uchar * pkt,unsigned dest,struct in_addr sip,unsigned src,unsigned len)1050 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
1051 unsigned src, unsigned len)
1052 {
1053 struct bootp_hdr *bp = (struct bootp_hdr *)pkt;
1054
1055 debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
1056 src, dest, len, dhcp_state);
1057
1058 /* Filter out pkts we don't want */
1059 if (check_reply_packet(pkt, dest, src, len))
1060 return;
1061
1062 debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: "
1063 "%d\n", src, dest, len, dhcp_state);
1064
1065 if (net_read_ip(&bp->bp_yiaddr).s_addr == 0) {
1066 #if defined(CONFIG_SERVERIP_FROM_PROXYDHCP)
1067 store_bootp_params(bp);
1068 #endif
1069 return;
1070 }
1071
1072 switch (dhcp_state) {
1073 case SELECTING:
1074 /*
1075 * Wait an appropriate time for any potential DHCPOFFER packets
1076 * to arrive. Then select one, and generate DHCPREQUEST
1077 * response. If filename is in format we recognize, assume it
1078 * is a valid OFFER from a server we want.
1079 */
1080 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
1081 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
1082 if (strncmp(bp->bp_file,
1083 CONFIG_SYS_BOOTFILE_PREFIX,
1084 strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) {
1085 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */
1086 dhcp_packet_process_options(bp);
1087 efi_net_set_dhcp_ack(pkt, len);
1088
1089 #if defined(CONFIG_SERVERIP_FROM_PROXYDHCP)
1090 if (!net_server_ip.s_addr)
1091 udelay(CONFIG_SERVERIP_FROM_PROXYDHCP_DELAY_MS *
1092 1000);
1093 #endif /* CONFIG_SERVERIP_FROM_PROXYDHCP */
1094
1095 debug("TRANSITIONING TO REQUESTING STATE\n");
1096 dhcp_state = REQUESTING;
1097
1098 net_set_timeout_handler(5000, bootp_timeout_handler);
1099 dhcp_send_request_packet(bp);
1100 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
1101 }
1102 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */
1103
1104 return;
1105 break;
1106 case REQUESTING:
1107 debug("DHCP State: REQUESTING\n");
1108
1109 if (dhcp_message_type((u8 *)bp->bp_vend) == DHCP_ACK) {
1110 dhcp_packet_process_options(bp);
1111 /* Store net params from reply */
1112 store_net_params(bp);
1113 dhcp_state = BOUND;
1114 printf("DHCP client bound to address %pI4 (%lu ms)\n",
1115 &net_ip, get_timer(bootp_start));
1116 net_set_timeout_handler(0, (thand_f *)0);
1117 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP,
1118 "bootp_stop");
1119
1120 net_auto_load();
1121 return;
1122 }
1123 break;
1124 case BOUND:
1125 /* DHCP client bound to address */
1126 break;
1127 default:
1128 puts("DHCP: INVALID STATE\n");
1129 break;
1130 }
1131 }
1132
dhcp_request(void)1133 void dhcp_request(void)
1134 {
1135 bootp_request();
1136 }
1137 #endif /* CONFIG_CMD_DHCP */
1138