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[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 <net.h>
14 #include <net/tftp.h>
15 #include "bootp.h"
16 #include "nfs.h"
17 #ifdef CONFIG_STATUS_LED
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 #if defined(CONFIG_CMD_DHCP)
64 static dhcp_state_t dhcp_state = INIT;
65 static u32 dhcp_leasetime;
66 static struct in_addr dhcp_server_ip;
67 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
68 unsigned src, unsigned len);
69
70 /* For Debug */
71 #if 0
72 static char *dhcpmsg2str(int type)
73 {
74 switch (type) {
75 case 1: return "DHCPDISCOVER"; break;
76 case 2: return "DHCPOFFER"; break;
77 case 3: return "DHCPREQUEST"; break;
78 case 4: return "DHCPDECLINE"; break;
79 case 5: return "DHCPACK"; break;
80 case 6: return "DHCPNACK"; break;
81 case 7: return "DHCPRELEASE"; break;
82 default: return "UNKNOWN/INVALID MSG TYPE"; break;
83 }
84 }
85 #endif
86 #endif
87
88 static void bootp_add_id(ulong id)
89 {
90 if (bootp_num_ids >= ARRAY_SIZE(bootp_ids)) {
91 size_t size = sizeof(bootp_ids) - sizeof(id);
92
93 memmove(bootp_ids, &bootp_ids[1], size);
94 bootp_ids[bootp_num_ids - 1] = id;
95 } else {
96 bootp_ids[bootp_num_ids] = id;
97 bootp_num_ids++;
98 }
99 }
100
101 static bool bootp_match_id(ulong id)
102 {
103 unsigned int i;
104
105 for (i = 0; i < bootp_num_ids; i++)
106 if (bootp_ids[i] == id)
107 return true;
108
109 return false;
110 }
111
112 static int check_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len)
113 {
114 struct bootp_hdr *bp = (struct bootp_hdr *)pkt;
115 int retval = 0;
116
117 if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
118 retval = -1;
119 else if (len < sizeof(struct bootp_hdr) - OPT_FIELD_SIZE)
120 retval = -2;
121 else if (bp->bp_op != OP_BOOTREQUEST &&
122 bp->bp_op != OP_BOOTREPLY &&
123 bp->bp_op != DHCP_OFFER &&
124 bp->bp_op != DHCP_ACK &&
125 bp->bp_op != DHCP_NAK)
126 retval = -3;
127 else if (bp->bp_htype != HWT_ETHER)
128 retval = -4;
129 else if (bp->bp_hlen != HWL_ETHER)
130 retval = -5;
131 else if (!bootp_match_id(net_read_u32(&bp->bp_id)))
132 retval = -6;
133
134 debug("Filtering pkt = %d\n", retval);
135
136 return retval;
137 }
138
139 /*
140 * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet
141 */
142 static void store_net_params(struct bootp_hdr *bp)
143 {
144 #if !defined(CONFIG_BOOTP_SERVERIP)
145 struct in_addr tmp_ip;
146
147 net_copy_ip(&tmp_ip, &bp->bp_siaddr);
148 if (tmp_ip.s_addr != 0)
149 net_copy_ip(&net_server_ip, &bp->bp_siaddr);
150 memcpy(net_server_ethaddr,
151 ((struct ethernet_hdr *)net_rx_packet)->et_src, 6);
152 if (strlen(bp->bp_file) > 0)
153 copy_filename(net_boot_file_name, bp->bp_file,
154 sizeof(net_boot_file_name));
155
156 debug("net_boot_file_name: %s\n", net_boot_file_name);
157
158 /* Propagate to environment:
159 * don't delete exising entry when BOOTP / DHCP reply does
160 * not contain a new value
161 */
162 if (*net_boot_file_name)
163 setenv("bootfile", net_boot_file_name);
164 #endif
165 net_copy_ip(&net_ip, &bp->bp_yiaddr);
166 }
167
168 static int truncate_sz(const char *name, int maxlen, int curlen)
169 {
170 if (curlen >= maxlen) {
171 printf("*** WARNING: %s is too long (%d - max: %d)"
172 " - truncated\n", name, curlen, maxlen);
173 curlen = maxlen - 1;
174 }
175 return curlen;
176 }
177
178 #if !defined(CONFIG_CMD_DHCP)
179
180 static void bootp_process_vendor_field(u8 *ext)
181 {
182 int size = *(ext + 1);
183
184 debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext,
185 *(ext + 1));
186
187 net_boot_file_expected_size_in_blocks = 0;
188
189 switch (*ext) {
190 /* Fixed length fields */
191 case 1: /* Subnet mask */
192 if (net_netmask.s_addr == 0)
193 net_copy_ip(&net_netmask, (struct in_addr *)(ext + 2));
194 break;
195 case 2: /* Time offset - Not yet supported */
196 break;
197 /* Variable length fields */
198 case 3: /* Gateways list */
199 if (net_gateway.s_addr == 0)
200 net_copy_ip(&net_gateway, (struct in_addr *)(ext + 2));
201 break;
202 case 4: /* Time server - Not yet supported */
203 break;
204 case 5: /* IEN-116 name server - Not yet supported */
205 break;
206 case 6:
207 if (net_dns_server.s_addr == 0)
208 net_copy_ip(&net_dns_server,
209 (struct in_addr *)(ext + 2));
210 #if defined(CONFIG_BOOTP_DNS2)
211 if ((net_dns_server2.s_addr == 0) && (size > 4))
212 net_copy_ip(&net_dns_server2,
213 (struct in_addr *)(ext + 2 + 4));
214 #endif
215 break;
216 case 7: /* Log server - Not yet supported */
217 break;
218 case 8: /* Cookie/Quote server - Not yet supported */
219 break;
220 case 9: /* LPR server - Not yet supported */
221 break;
222 case 10: /* Impress server - Not yet supported */
223 break;
224 case 11: /* RPL server - Not yet supported */
225 break;
226 case 12: /* Host name */
227 if (net_hostname[0] == 0) {
228 size = truncate_sz("Host Name",
229 sizeof(net_hostname), size);
230 memcpy(&net_hostname, ext + 2, size);
231 net_hostname[size] = 0;
232 }
233 break;
234 case 13: /* Boot file size */
235 if (size == 2)
236 net_boot_file_expected_size_in_blocks =
237 ntohs(*(ushort *)(ext + 2));
238 else if (size == 4)
239 net_boot_file_expected_size_in_blocks =
240 ntohl(*(ulong *)(ext + 2));
241 break;
242 case 14: /* Merit dump file - Not yet supported */
243 break;
244 case 15: /* Domain name - Not yet supported */
245 break;
246 case 16: /* Swap server - Not yet supported */
247 break;
248 case 17: /* Root path */
249 if (net_root_path[0] == 0) {
250 size = truncate_sz("Root Path",
251 sizeof(net_root_path), size);
252 memcpy(&net_root_path, ext + 2, size);
253 net_root_path[size] = 0;
254 }
255 break;
256 case 18: /* Extension path - Not yet supported */
257 /*
258 * This can be used to send the information of the
259 * vendor area in another file that the client can
260 * access via TFTP.
261 */
262 break;
263 /* IP host layer fields */
264 case 40: /* NIS Domain name */
265 if (net_nis_domain[0] == 0) {
266 size = truncate_sz("NIS Domain Name",
267 sizeof(net_nis_domain), size);
268 memcpy(&net_nis_domain, ext + 2, size);
269 net_nis_domain[size] = 0;
270 }
271 break;
272 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
273 case 42: /* NTP server IP */
274 net_copy_ip(&net_ntp_server, (struct in_addr *)(ext + 2));
275 break;
276 #endif
277 /* Application layer fields */
278 case 43: /* Vendor specific info - Not yet supported */
279 /*
280 * Binary information to exchange specific
281 * product information.
282 */
283 break;
284 /* Reserved (custom) fields (128..254) */
285 }
286 }
287
288 static void bootp_process_vendor(u8 *ext, int size)
289 {
290 u8 *end = ext + size;
291
292 debug("[BOOTP] Checking extension (%d bytes)...\n", size);
293
294 while ((ext < end) && (*ext != 0xff)) {
295 if (*ext == 0) {
296 ext++;
297 } else {
298 u8 *opt = ext;
299
300 ext += ext[1] + 2;
301 if (ext <= end)
302 bootp_process_vendor_field(opt);
303 }
304 }
305
306 debug("[BOOTP] Received fields:\n");
307 if (net_netmask.s_addr)
308 debug("net_netmask : %pI4\n", &net_netmask);
309
310 if (net_gateway.s_addr)
311 debug("net_gateway : %pI4", &net_gateway);
312
313 if (net_boot_file_expected_size_in_blocks)
314 debug("net_boot_file_expected_size_in_blocks : %d\n",
315 net_boot_file_expected_size_in_blocks);
316
317 if (net_hostname[0])
318 debug("net_hostname : %s\n", net_hostname);
319
320 if (net_root_path[0])
321 debug("net_root_path : %s\n", net_root_path);
322
323 if (net_nis_domain[0])
324 debug("net_nis_domain : %s\n", net_nis_domain);
325
326 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
327 if (net_ntp_server)
328 debug("net_ntp_server : %pI4\n", &net_ntp_server);
329 #endif
330 }
331
332 /*
333 * Handle a BOOTP received packet.
334 */
335 static void bootp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
336 unsigned src, unsigned len)
337 {
338 struct bootp_hdr *bp;
339
340 debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n",
341 src, dest, len, sizeof(struct bootp_hdr));
342
343 bp = (struct bootp_hdr *)pkt;
344
345 /* Filter out pkts we don't want */
346 if (check_packet(pkt, dest, src, len))
347 return;
348
349 /*
350 * Got a good BOOTP reply. Copy the data into our variables.
351 */
352 #if defined(CONFIG_STATUS_LED) && defined(STATUS_LED_BOOT)
353 status_led_set(STATUS_LED_BOOT, STATUS_LED_OFF);
354 #endif
355
356 store_net_params(bp); /* Store net parameters from reply */
357
358 /* Retrieve extended information (we must parse the vendor area) */
359 if (net_read_u32((u32 *)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
360 bootp_process_vendor((uchar *)&bp->bp_vend[4], len);
361
362 net_set_timeout_handler(0, (thand_f *)0);
363 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop");
364
365 debug("Got good BOOTP\n");
366
367 net_auto_load();
368 }
369 #endif
370
371 /*
372 * Timeout on BOOTP/DHCP request.
373 */
374 static void bootp_timeout_handler(void)
375 {
376 ulong time_taken = get_timer(bootp_start);
377
378 if (time_taken >= TIMEOUT_MS) {
379 #ifdef CONFIG_BOOTP_MAY_FAIL
380 puts("\nRetry time exceeded\n");
381 net_set_state(NETLOOP_FAIL);
382 #else
383 puts("\nRetry time exceeded; starting again\n");
384 net_start_again();
385 #endif
386 } else {
387 bootp_timeout *= 2;
388 if (bootp_timeout > 2000)
389 bootp_timeout = 2000;
390 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
391 bootp_request();
392 }
393 }
394
395 #define put_vci(e, str) \
396 do { \
397 size_t vci_strlen = strlen(str); \
398 *e++ = 60; /* Vendor Class Identifier */ \
399 *e++ = vci_strlen; \
400 memcpy(e, str, vci_strlen); \
401 e += vci_strlen; \
402 } while (0)
403
404 /*
405 * Initialize BOOTP extension fields in the request.
406 */
407 #if defined(CONFIG_CMD_DHCP)
408 static int dhcp_extended(u8 *e, int message_type, struct in_addr server_ip,
409 struct in_addr requested_ip)
410 {
411 u8 *start = e;
412 u8 *cnt;
413 #if defined(CONFIG_BOOTP_PXE)
414 char *uuid;
415 u16 clientarch;
416 #endif
417
418 #if defined(CONFIG_BOOTP_VENDOREX)
419 u8 *x;
420 #endif
421 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
422 char *hostname;
423 #endif
424
425 *e++ = 99; /* RFC1048 Magic Cookie */
426 *e++ = 130;
427 *e++ = 83;
428 *e++ = 99;
429
430 *e++ = 53; /* DHCP Message Type */
431 *e++ = 1;
432 *e++ = message_type;
433
434 *e++ = 57; /* Maximum DHCP Message Size */
435 *e++ = 2;
436 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 8;
437 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
438
439 if (server_ip.s_addr) {
440 int tmp = ntohl(server_ip.s_addr);
441
442 *e++ = 54; /* ServerID */
443 *e++ = 4;
444 *e++ = tmp >> 24;
445 *e++ = tmp >> 16;
446 *e++ = tmp >> 8;
447 *e++ = tmp & 0xff;
448 }
449
450 if (requested_ip.s_addr) {
451 int tmp = ntohl(requested_ip.s_addr);
452
453 *e++ = 50; /* Requested IP */
454 *e++ = 4;
455 *e++ = tmp >> 24;
456 *e++ = tmp >> 16;
457 *e++ = tmp >> 8;
458 *e++ = tmp & 0xff;
459 }
460 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
461 hostname = getenv("hostname");
462 if (hostname) {
463 int hostnamelen = strlen(hostname);
464
465 *e++ = 12; /* Hostname */
466 *e++ = hostnamelen;
467 memcpy(e, hostname, hostnamelen);
468 e += hostnamelen;
469 }
470 #endif
471
472 #if defined(CONFIG_BOOTP_PXE)
473 clientarch = CONFIG_BOOTP_PXE_CLIENTARCH;
474 *e++ = 93; /* Client System Architecture */
475 *e++ = 2;
476 *e++ = (clientarch >> 8) & 0xff;
477 *e++ = clientarch & 0xff;
478
479 *e++ = 94; /* Client Network Interface Identifier */
480 *e++ = 3;
481 *e++ = 1; /* type field for UNDI */
482 *e++ = 0; /* major revision */
483 *e++ = 0; /* minor revision */
484
485 uuid = getenv("pxeuuid");
486
487 if (uuid) {
488 if (uuid_str_valid(uuid)) {
489 *e++ = 97; /* Client Machine Identifier */
490 *e++ = 17;
491 *e++ = 0; /* type 0 - UUID */
492
493 uuid_str_to_bin(uuid, e, UUID_STR_FORMAT_STD);
494 e += 16;
495 } else {
496 printf("Invalid pxeuuid: %s\n", uuid);
497 }
498 }
499 #endif
500
501 #if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING)
502 put_vci(e, CONFIG_SPL_NET_VCI_STRING);
503 #elif defined(CONFIG_BOOTP_VCI_STRING)
504 put_vci(e, CONFIG_BOOTP_VCI_STRING);
505 #endif
506
507 #if defined(CONFIG_BOOTP_VENDOREX)
508 x = dhcp_vendorex_prep(e);
509 if (x)
510 return x - start;
511 #endif
512
513 *e++ = 55; /* Parameter Request List */
514 cnt = e++; /* Pointer to count of requested items */
515 *cnt = 0;
516 #if defined(CONFIG_BOOTP_SUBNETMASK)
517 *e++ = 1; /* Subnet Mask */
518 *cnt += 1;
519 #endif
520 #if defined(CONFIG_BOOTP_TIMEOFFSET)
521 *e++ = 2;
522 *cnt += 1;
523 #endif
524 #if defined(CONFIG_BOOTP_GATEWAY)
525 *e++ = 3; /* Router Option */
526 *cnt += 1;
527 #endif
528 #if defined(CONFIG_BOOTP_DNS)
529 *e++ = 6; /* DNS Server(s) */
530 *cnt += 1;
531 #endif
532 #if defined(CONFIG_BOOTP_HOSTNAME)
533 *e++ = 12; /* Hostname */
534 *cnt += 1;
535 #endif
536 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
537 *e++ = 13; /* Boot File Size */
538 *cnt += 1;
539 #endif
540 #if defined(CONFIG_BOOTP_BOOTPATH)
541 *e++ = 17; /* Boot path */
542 *cnt += 1;
543 #endif
544 #if defined(CONFIG_BOOTP_NISDOMAIN)
545 *e++ = 40; /* NIS Domain name request */
546 *cnt += 1;
547 #endif
548 #if defined(CONFIG_BOOTP_NTPSERVER)
549 *e++ = 42;
550 *cnt += 1;
551 #endif
552 /* no options, so back up to avoid sending an empty request list */
553 if (*cnt == 0)
554 e -= 2;
555
556 *e++ = 255; /* End of the list */
557
558 /* Pad to minimal length */
559 #ifdef CONFIG_DHCP_MIN_EXT_LEN
560 while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN)
561 *e++ = 0;
562 #endif
563
564 return e - start;
565 }
566
567 #else
568 /*
569 * Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
570 */
571 static int bootp_extended(u8 *e)
572 {
573 u8 *start = e;
574
575 *e++ = 99; /* RFC1048 Magic Cookie */
576 *e++ = 130;
577 *e++ = 83;
578 *e++ = 99;
579
580 #if defined(CONFIG_CMD_DHCP)
581 *e++ = 53; /* DHCP Message Type */
582 *e++ = 1;
583 *e++ = DHCP_DISCOVER;
584
585 *e++ = 57; /* Maximum DHCP Message Size */
586 *e++ = 2;
587 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 16;
588 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
589 #endif
590
591 #if defined(CONFIG_BOOTP_VCI_STRING) || \
592 (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING))
593 #ifdef CONFIG_SPL_BUILD
594 put_vci(e, CONFIG_SPL_NET_VCI_STRING);
595 #else
596 put_vci(e, CONFIG_BOOTP_VCI_STRING);
597 #endif
598 #endif
599
600 #if defined(CONFIG_BOOTP_SUBNETMASK)
601 *e++ = 1; /* Subnet mask request */
602 *e++ = 4;
603 e += 4;
604 #endif
605
606 #if defined(CONFIG_BOOTP_GATEWAY)
607 *e++ = 3; /* Default gateway request */
608 *e++ = 4;
609 e += 4;
610 #endif
611
612 #if defined(CONFIG_BOOTP_DNS)
613 *e++ = 6; /* Domain Name Server */
614 *e++ = 4;
615 e += 4;
616 #endif
617
618 #if defined(CONFIG_BOOTP_HOSTNAME)
619 *e++ = 12; /* Host name request */
620 *e++ = 32;
621 e += 32;
622 #endif
623
624 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
625 *e++ = 13; /* Boot file size */
626 *e++ = 2;
627 e += 2;
628 #endif
629
630 #if defined(CONFIG_BOOTP_BOOTPATH)
631 *e++ = 17; /* Boot path */
632 *e++ = 32;
633 e += 32;
634 #endif
635
636 #if defined(CONFIG_BOOTP_NISDOMAIN)
637 *e++ = 40; /* NIS Domain name request */
638 *e++ = 32;
639 e += 32;
640 #endif
641 #if defined(CONFIG_BOOTP_NTPSERVER)
642 *e++ = 42;
643 *e++ = 4;
644 e += 4;
645 #endif
646
647 *e++ = 255; /* End of the list */
648
649 return e - start;
650 }
651 #endif
652
653 void bootp_reset(void)
654 {
655 bootp_num_ids = 0;
656 bootp_try = 0;
657 bootp_start = get_timer(0);
658 bootp_timeout = 250;
659 }
660
661 void bootp_request(void)
662 {
663 uchar *pkt, *iphdr;
664 struct bootp_hdr *bp;
665 int extlen, pktlen, iplen;
666 int eth_hdr_size;
667 #ifdef CONFIG_BOOTP_RANDOM_DELAY
668 ulong rand_ms;
669 #endif
670 u32 bootp_id;
671 struct in_addr zero_ip;
672 struct in_addr bcast_ip;
673
674 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start");
675 #if defined(CONFIG_CMD_DHCP)
676 dhcp_state = INIT;
677 #endif
678
679 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */
680 if (bootp_try == 0)
681 srand_mac();
682
683 if (bootp_try <= 2) /* Start with max 1024 * 1ms */
684 rand_ms = rand() >> (22 - bootp_try);
685 else /* After 3rd BOOTP request max 8192 * 1ms */
686 rand_ms = rand() >> 19;
687
688 printf("Random delay: %ld ms...\n", rand_ms);
689 mdelay(rand_ms);
690
691 #endif /* CONFIG_BOOTP_RANDOM_DELAY */
692
693 printf("BOOTP broadcast %d\n", ++bootp_try);
694 pkt = net_tx_packet;
695 memset((void *)pkt, 0, PKTSIZE);
696
697 eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
698 pkt += eth_hdr_size;
699
700 /*
701 * Next line results in incorrect packet size being transmitted,
702 * resulting in errors in some DHCP servers, reporting missing bytes.
703 * Size must be set in packet header after extension length has been
704 * determined.
705 * C. Hallinan, DS4.COM, Inc.
706 */
707 /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC,
708 sizeof (struct bootp_hdr)); */
709 iphdr = pkt; /* We need this later for net_set_udp_header() */
710 pkt += IP_UDP_HDR_SIZE;
711
712 bp = (struct bootp_hdr *)pkt;
713 bp->bp_op = OP_BOOTREQUEST;
714 bp->bp_htype = HWT_ETHER;
715 bp->bp_hlen = HWL_ETHER;
716 bp->bp_hops = 0;
717 bp->bp_secs = htons(get_timer(0) / 1000);
718 zero_ip.s_addr = 0;
719 net_write_ip(&bp->bp_ciaddr, zero_ip);
720 net_write_ip(&bp->bp_yiaddr, zero_ip);
721 net_write_ip(&bp->bp_siaddr, zero_ip);
722 net_write_ip(&bp->bp_giaddr, zero_ip);
723 memcpy(bp->bp_chaddr, net_ethaddr, 6);
724 copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
725
726 /* Request additional information from the BOOTP/DHCP server */
727 #if defined(CONFIG_CMD_DHCP)
728 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_DISCOVER, zero_ip,
729 zero_ip);
730 #else
731 extlen = bootp_extended((u8 *)bp->bp_vend);
732 #endif
733
734 /*
735 * Bootp ID is the lower 4 bytes of our ethernet address
736 * plus the current time in ms.
737 */
738 bootp_id = ((u32)net_ethaddr[2] << 24)
739 | ((u32)net_ethaddr[3] << 16)
740 | ((u32)net_ethaddr[4] << 8)
741 | (u32)net_ethaddr[5];
742 bootp_id += get_timer(0);
743 bootp_id = htonl(bootp_id);
744 bootp_add_id(bootp_id);
745 net_copy_u32(&bp->bp_id, &bootp_id);
746
747 /*
748 * Calculate proper packet lengths taking into account the
749 * variable size of the options field
750 */
751 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
752 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
753 bcast_ip.s_addr = 0xFFFFFFFFL;
754 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
755 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
756
757 #if defined(CONFIG_CMD_DHCP)
758 dhcp_state = SELECTING;
759 net_set_udp_handler(dhcp_handler);
760 #else
761 net_set_udp_handler(bootp_handler);
762 #endif
763 net_send_packet(net_tx_packet, pktlen);
764 }
765
766 #if defined(CONFIG_CMD_DHCP)
767 static void dhcp_process_options(uchar *popt, struct bootp_hdr *bp)
768 {
769 uchar *end = popt + BOOTP_HDR_SIZE;
770 int oplen, size;
771 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
772 int *to_ptr;
773 #endif
774
775 while (popt < end && *popt != 0xff) {
776 oplen = *(popt + 1);
777 switch (*popt) {
778 case 1:
779 net_copy_ip(&net_netmask, (popt + 2));
780 break;
781 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
782 case 2: /* Time offset */
783 to_ptr = &net_ntp_time_offset;
784 net_copy_u32((u32 *)to_ptr, (u32 *)(popt + 2));
785 net_ntp_time_offset = ntohl(net_ntp_time_offset);
786 break;
787 #endif
788 case 3:
789 net_copy_ip(&net_gateway, (popt + 2));
790 break;
791 case 6:
792 net_copy_ip(&net_dns_server, (popt + 2));
793 #if defined(CONFIG_BOOTP_DNS2)
794 if (*(popt + 1) > 4)
795 net_copy_ip(&net_dns_server2, (popt + 2 + 4));
796 #endif
797 break;
798 case 12:
799 size = truncate_sz("Host Name",
800 sizeof(net_hostname), oplen);
801 memcpy(&net_hostname, popt + 2, size);
802 net_hostname[size] = 0;
803 break;
804 case 15: /* Ignore Domain Name Option */
805 break;
806 case 17:
807 size = truncate_sz("Root Path",
808 sizeof(net_root_path), oplen);
809 memcpy(&net_root_path, popt + 2, size);
810 net_root_path[size] = 0;
811 break;
812 case 28: /* Ignore Broadcast Address Option */
813 break;
814 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
815 case 42: /* NTP server IP */
816 net_copy_ip(&net_ntp_server, (popt + 2));
817 break;
818 #endif
819 case 51:
820 net_copy_u32(&dhcp_leasetime, (u32 *)(popt + 2));
821 break;
822 case 53: /* Ignore Message Type Option */
823 break;
824 case 54:
825 net_copy_ip(&dhcp_server_ip, (popt + 2));
826 break;
827 case 58: /* Ignore Renewal Time Option */
828 break;
829 case 59: /* Ignore Rebinding Time Option */
830 break;
831 case 66: /* Ignore TFTP server name */
832 break;
833 case 67: /* vendor opt bootfile */
834 /*
835 * I can't use dhcp_vendorex_proc here because I need
836 * to write into the bootp packet - even then I had to
837 * pass the bootp packet pointer into here as the
838 * second arg
839 */
840 size = truncate_sz("Opt Boot File",
841 sizeof(bp->bp_file),
842 oplen);
843 if (bp->bp_file[0] == '\0' && size > 0) {
844 /*
845 * only use vendor boot file if we didn't
846 * receive a boot file in the main non-vendor
847 * part of the packet - god only knows why
848 * some vendors chose not to use this perfectly
849 * good spot to store the boot file (join on
850 * Tru64 Unix) it seems mind bogglingly crazy
851 * to me
852 */
853 printf("*** WARNING: using vendor "
854 "optional boot file\n");
855 memcpy(bp->bp_file, popt + 2, size);
856 bp->bp_file[size] = '\0';
857 }
858 break;
859 default:
860 #if defined(CONFIG_BOOTP_VENDOREX)
861 if (dhcp_vendorex_proc(popt))
862 break;
863 #endif
864 printf("*** Unhandled DHCP Option in OFFER/ACK:"
865 " %d\n", *popt);
866 break;
867 }
868 popt += oplen + 2; /* Process next option */
869 }
870 }
871
872 static int dhcp_message_type(unsigned char *popt)
873 {
874 if (net_read_u32((u32 *)popt) != htonl(BOOTP_VENDOR_MAGIC))
875 return -1;
876
877 popt += 4;
878 while (*popt != 0xff) {
879 if (*popt == 53) /* DHCP Message Type */
880 return *(popt + 2);
881 popt += *(popt + 1) + 2; /* Scan through all options */
882 }
883 return -1;
884 }
885
886 static void dhcp_send_request_packet(struct bootp_hdr *bp_offer)
887 {
888 uchar *pkt, *iphdr;
889 struct bootp_hdr *bp;
890 int pktlen, iplen, extlen;
891 int eth_hdr_size;
892 struct in_addr offered_ip;
893 struct in_addr zero_ip;
894 struct in_addr bcast_ip;
895
896 debug("dhcp_send_request_packet: Sending DHCPREQUEST\n");
897 pkt = net_tx_packet;
898 memset((void *)pkt, 0, PKTSIZE);
899
900 eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
901 pkt += eth_hdr_size;
902
903 iphdr = pkt; /* We'll need this later to set proper pkt size */
904 pkt += IP_UDP_HDR_SIZE;
905
906 bp = (struct bootp_hdr *)pkt;
907 bp->bp_op = OP_BOOTREQUEST;
908 bp->bp_htype = HWT_ETHER;
909 bp->bp_hlen = HWL_ETHER;
910 bp->bp_hops = 0;
911 bp->bp_secs = htons(get_timer(0) / 1000);
912 /* Do not set the client IP, your IP, or server IP yet, since it
913 * hasn't been ACK'ed by the server yet */
914
915 /*
916 * RFC3046 requires Relay Agents to discard packets with
917 * nonzero and offered giaddr
918 */
919 zero_ip.s_addr = 0;
920 net_write_ip(&bp->bp_giaddr, zero_ip);
921
922 memcpy(bp->bp_chaddr, net_ethaddr, 6);
923
924 /*
925 * ID is the id of the OFFER packet
926 */
927
928 net_copy_u32(&bp->bp_id, &bp_offer->bp_id);
929
930 /*
931 * Copy options from OFFER packet if present
932 */
933
934 /* Copy offered IP into the parameters request list */
935 net_copy_ip(&offered_ip, &bp_offer->bp_yiaddr);
936 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST,
937 dhcp_server_ip, offered_ip);
938
939 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
940 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
941 bcast_ip.s_addr = 0xFFFFFFFFL;
942 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
943
944 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
945 udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
946 #endif /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
947 debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
948 net_send_packet(net_tx_packet, pktlen);
949 }
950
951 /*
952 * Handle DHCP received packets.
953 */
954 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
955 unsigned src, unsigned len)
956 {
957 struct bootp_hdr *bp = (struct bootp_hdr *)pkt;
958
959 debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
960 src, dest, len, dhcp_state);
961
962 /* Filter out pkts we don't want */
963 if (check_packet(pkt, dest, src, len))
964 return;
965
966 debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: "
967 "%d\n", src, dest, len, dhcp_state);
968
969 switch (dhcp_state) {
970 case SELECTING:
971 /*
972 * Wait an appropriate time for any potential DHCPOFFER packets
973 * to arrive. Then select one, and generate DHCPREQUEST
974 * response. If filename is in format we recognize, assume it
975 * is a valid OFFER from a server we want.
976 */
977 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
978 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
979 if (strncmp(bp->bp_file,
980 CONFIG_SYS_BOOTFILE_PREFIX,
981 strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) {
982 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */
983
984 debug("TRANSITIONING TO REQUESTING STATE\n");
985 dhcp_state = REQUESTING;
986
987 if (net_read_u32((u32 *)&bp->bp_vend[0]) ==
988 htonl(BOOTP_VENDOR_MAGIC))
989 dhcp_process_options((u8 *)&bp->bp_vend[4], bp);
990
991 net_set_timeout_handler(5000, bootp_timeout_handler);
992 dhcp_send_request_packet(bp);
993 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
994 }
995 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */
996
997 return;
998 break;
999 case REQUESTING:
1000 debug("DHCP State: REQUESTING\n");
1001
1002 if (dhcp_message_type((u8 *)bp->bp_vend) == DHCP_ACK) {
1003 if (net_read_u32((u32 *)&bp->bp_vend[0]) ==
1004 htonl(BOOTP_VENDOR_MAGIC))
1005 dhcp_process_options((u8 *)&bp->bp_vend[4], bp);
1006 /* Store net params from reply */
1007 store_net_params(bp);
1008 dhcp_state = BOUND;
1009 printf("DHCP client bound to address %pI4 (%lu ms)\n",
1010 &net_ip, get_timer(bootp_start));
1011 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP,
1012 "bootp_stop");
1013
1014 net_auto_load();
1015 return;
1016 }
1017 break;
1018 case BOUND:
1019 /* DHCP client bound to address */
1020 break;
1021 default:
1022 puts("DHCP: INVALID STATE\n");
1023 break;
1024 }
1025 }
1026
1027 void dhcp_request(void)
1028 {
1029 bootp_request();
1030 }
1031 #endif /* CONFIG_CMD_DHCP */
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