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