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net: cosmetic: Fixup var names for DHCP strings
[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 "bootp.h"
15 #include "tftp.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 ulong bootp_ids[CONFIG_BOOTP_ID_CACHE_SIZE];
55 unsigned int bootp_num_ids;
56 int BootpTry;
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 unsigned long 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 BootpCheckPkt(uchar *pkt, unsigned dest, unsigned src, unsigned len)
113 {
114 struct Bootp_t *bp = (struct Bootp_t *) pkt;
115 int retval = 0;
116
117 if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
118 retval = -1;
119 else if (len < sizeof(struct Bootp_t) - 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(NetReadLong((ulong *)&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 BootpCopyNetParams(struct Bootp_t *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(NetServerEther, ((struct ethernet_hdr *)NetRxPacket)->et_src, 6);
151 if (strlen(bp->bp_file) > 0)
152 copy_filename(net_boot_file_name, bp->bp_file,
153 sizeof(net_boot_file_name));
154
155 debug("net_boot_file_name: %s\n", net_boot_file_name);
156
157 /* Propagate to environment:
158 * don't delete exising entry when BOOTP / DHCP reply does
159 * not contain a new value
160 */
161 if (*net_boot_file_name)
162 setenv("bootfile", net_boot_file_name);
163 #endif
164 net_copy_ip(&net_ip, &bp->bp_yiaddr);
165 }
166
167 static int truncate_sz(const char *name, int maxlen, int curlen)
168 {
169 if (curlen >= maxlen) {
170 printf("*** WARNING: %s is too long (%d - max: %d)"
171 " - truncated\n", name, curlen, maxlen);
172 curlen = maxlen - 1;
173 }
174 return curlen;
175 }
176
177 #if !defined(CONFIG_CMD_DHCP)
178
179 static void BootpVendorFieldProcess(u8 *ext)
180 {
181 int size = *(ext + 1);
182
183 debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext,
184 *(ext + 1));
185
186 net_boot_file_expected_size_in_blocks = 0;
187
188 switch (*ext) {
189 /* Fixed length fields */
190 case 1: /* Subnet mask */
191 if (net_netmask.s_addr == 0)
192 net_copy_ip(&net_netmask, (struct in_addr *)(ext + 2));
193 break;
194 case 2: /* Time offset - Not yet supported */
195 break;
196 /* Variable length fields */
197 case 3: /* Gateways list */
198 if (net_gateway.s_addr == 0)
199 net_copy_ip(&net_gateway, (struct in_addr *)(ext + 2));
200 break;
201 case 4: /* Time server - Not yet supported */
202 break;
203 case 5: /* IEN-116 name server - Not yet supported */
204 break;
205 case 6:
206 if (net_dns_server.s_addr == 0)
207 net_copy_ip(&net_dns_server,
208 (struct in_addr *)(ext + 2));
209 #if defined(CONFIG_BOOTP_DNS2)
210 if ((net_dns_server2.s_addr == 0) && (size > 4))
211 net_copy_ip(&net_dns_server2,
212 (struct in_addr *)(ext + 2 + 4));
213 #endif
214 break;
215 case 7: /* Log server - Not yet supported */
216 break;
217 case 8: /* Cookie/Quote server - Not yet supported */
218 break;
219 case 9: /* LPR server - Not yet supported */
220 break;
221 case 10: /* Impress server - Not yet supported */
222 break;
223 case 11: /* RPL server - Not yet supported */
224 break;
225 case 12: /* Host name */
226 if (net_hostname[0] == 0) {
227 size = truncate_sz("Host Name",
228 sizeof(net_hostname), size);
229 memcpy(&net_hostname, ext + 2, size);
230 net_hostname[size] = 0;
231 }
232 break;
233 case 13: /* Boot file size */
234 if (size == 2)
235 net_boot_file_expected_size_in_blocks =
236 ntohs(*(ushort *)(ext + 2));
237 else if (size == 4)
238 net_boot_file_expected_size_in_blocks =
239 ntohl(*(ulong *)(ext + 2));
240 break;
241 case 14: /* Merit dump file - Not yet supported */
242 break;
243 case 15: /* Domain name - Not yet supported */
244 break;
245 case 16: /* Swap server - Not yet supported */
246 break;
247 case 17: /* Root path */
248 if (net_root_path[0] == 0) {
249 size = truncate_sz("Root Path",
250 sizeof(net_root_path), size);
251 memcpy(&net_root_path, ext + 2, size);
252 net_root_path[size] = 0;
253 }
254 break;
255 case 18: /* Extension path - Not yet supported */
256 /*
257 * This can be used to send the information of the
258 * vendor area in another file that the client can
259 * access via TFTP.
260 */
261 break;
262 /* IP host layer fields */
263 case 40: /* NIS Domain name */
264 if (net_nis_domain[0] == 0) {
265 size = truncate_sz("NIS Domain Name",
266 sizeof(net_nis_domain), size);
267 memcpy(&net_nis_domain, ext + 2, size);
268 net_nis_domain[size] = 0;
269 }
270 break;
271 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
272 case 42: /* NTP server IP */
273 net_copy_ip(&net_ntp_server, (struct in_addr *)(ext + 2));
274 break;
275 #endif
276 /* Application layer fields */
277 case 43: /* Vendor specific info - Not yet supported */
278 /*
279 * Binary information to exchange specific
280 * product information.
281 */
282 break;
283 /* Reserved (custom) fields (128..254) */
284 }
285 }
286
287 static void BootpVendorProcess(u8 *ext, int size)
288 {
289 u8 *end = ext + size;
290
291 debug("[BOOTP] Checking extension (%d bytes)...\n", size);
292
293 while ((ext < end) && (*ext != 0xff)) {
294 if (*ext == 0) {
295 ext++;
296 } else {
297 u8 *opt = ext;
298
299 ext += ext[1] + 2;
300 if (ext <= end)
301 BootpVendorFieldProcess(opt);
302 }
303 }
304
305 debug("[BOOTP] Received fields:\n");
306 if (net_netmask.s_addr)
307 debug("net_netmask : %pI4\n", &net_netmask);
308
309 if (net_gateway.s_addr)
310 debug("net_gateway : %pI4", &net_gateway);
311
312 if (net_boot_file_expected_size_in_blocks)
313 debug("net_boot_file_expected_size_in_blocks : %d\n",
314 net_boot_file_expected_size_in_blocks);
315
316 if (net_hostname[0])
317 debug("net_hostname : %s\n", net_hostname);
318
319 if (net_root_path[0])
320 debug("net_root_path : %s\n", net_root_path);
321
322 if (net_nis_domain[0])
323 debug("net_nis_domain : %s\n", net_nis_domain);
324
325 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
326 if (net_ntp_server)
327 debug("net_ntp_server : %pI4\n", &net_ntp_server);
328 #endif
329 }
330
331 /*
332 * Handle a BOOTP received packet.
333 */
334 static void bootp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
335 unsigned src, unsigned len)
336 {
337 struct Bootp_t *bp;
338
339 debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n",
340 src, dest, len, sizeof(struct Bootp_t));
341
342 bp = (struct Bootp_t *)pkt;
343
344 /* Filter out pkts we don't want */
345 if (BootpCheckPkt(pkt, dest, src, len))
346 return;
347
348 /*
349 * Got a good BOOTP reply. Copy the data into our variables.
350 */
351 #ifdef CONFIG_STATUS_LED
352 status_led_set(STATUS_LED_BOOT, STATUS_LED_OFF);
353 #endif
354
355 BootpCopyNetParams(bp); /* Store net parameters from reply */
356
357 /* Retrieve extended information (we must parse the vendor area) */
358 if (NetReadLong((ulong *)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
359 BootpVendorProcess((uchar *)&bp->bp_vend[4], len);
360
361 NetSetTimeout(0, (thand_f *)0);
362 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop");
363
364 debug("Got good BOOTP\n");
365
366 net_auto_load();
367 }
368 #endif
369
370 /*
371 * Timeout on BOOTP/DHCP request.
372 */
373 static void
374 BootpTimeout(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 NetStartAgain();
385 #endif
386 } else {
387 bootp_timeout *= 2;
388 if (bootp_timeout > 2000)
389 bootp_timeout = 2000;
390 NetSetTimeout(bootp_timeout, BootpTimeout);
391 BootpRequest();
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 #ifdef CONFIG_BOOTP_VCI_STRING
502 put_vci(e, CONFIG_BOOTP_VCI_STRING);
503 #endif
504
505 #if defined(CONFIG_BOOTP_VENDOREX)
506 x = dhcp_vendorex_prep(e);
507 if (x)
508 return x - start;
509 #endif
510
511 *e++ = 55; /* Parameter Request List */
512 cnt = e++; /* Pointer to count of requested items */
513 *cnt = 0;
514 #if defined(CONFIG_BOOTP_SUBNETMASK)
515 *e++ = 1; /* Subnet Mask */
516 *cnt += 1;
517 #endif
518 #if defined(CONFIG_BOOTP_TIMEOFFSET)
519 *e++ = 2;
520 *cnt += 1;
521 #endif
522 #if defined(CONFIG_BOOTP_GATEWAY)
523 *e++ = 3; /* Router Option */
524 *cnt += 1;
525 #endif
526 #if defined(CONFIG_BOOTP_DNS)
527 *e++ = 6; /* DNS Server(s) */
528 *cnt += 1;
529 #endif
530 #if defined(CONFIG_BOOTP_HOSTNAME)
531 *e++ = 12; /* Hostname */
532 *cnt += 1;
533 #endif
534 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
535 *e++ = 13; /* Boot File Size */
536 *cnt += 1;
537 #endif
538 #if defined(CONFIG_BOOTP_BOOTPATH)
539 *e++ = 17; /* Boot path */
540 *cnt += 1;
541 #endif
542 #if defined(CONFIG_BOOTP_NISDOMAIN)
543 *e++ = 40; /* NIS Domain name request */
544 *cnt += 1;
545 #endif
546 #if defined(CONFIG_BOOTP_NTPSERVER)
547 *e++ = 42;
548 *cnt += 1;
549 #endif
550 /* no options, so back up to avoid sending an empty request list */
551 if (*cnt == 0)
552 e -= 2;
553
554 *e++ = 255; /* End of the list */
555
556 /* Pad to minimal length */
557 #ifdef CONFIG_DHCP_MIN_EXT_LEN
558 while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN)
559 *e++ = 0;
560 #endif
561
562 return e - start;
563 }
564
565 #else
566 /*
567 * Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
568 */
569 static int bootp_extended(u8 *e)
570 {
571 u8 *start = e;
572
573 *e++ = 99; /* RFC1048 Magic Cookie */
574 *e++ = 130;
575 *e++ = 83;
576 *e++ = 99;
577
578 #if defined(CONFIG_CMD_DHCP)
579 *e++ = 53; /* DHCP Message Type */
580 *e++ = 1;
581 *e++ = DHCP_DISCOVER;
582
583 *e++ = 57; /* Maximum DHCP Message Size */
584 *e++ = 2;
585 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 16;
586 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
587 #endif
588
589 #if defined(CONFIG_BOOTP_VCI_STRING) || \
590 (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING))
591 #ifdef CONFIG_SPL_BUILD
592 put_vci(e, CONFIG_SPL_NET_VCI_STRING);
593 #else
594 put_vci(e, CONFIG_BOOTP_VCI_STRING);
595 #endif
596 #endif
597
598 #if defined(CONFIG_BOOTP_SUBNETMASK)
599 *e++ = 1; /* Subnet mask request */
600 *e++ = 4;
601 e += 4;
602 #endif
603
604 #if defined(CONFIG_BOOTP_GATEWAY)
605 *e++ = 3; /* Default gateway request */
606 *e++ = 4;
607 e += 4;
608 #endif
609
610 #if defined(CONFIG_BOOTP_DNS)
611 *e++ = 6; /* Domain Name Server */
612 *e++ = 4;
613 e += 4;
614 #endif
615
616 #if defined(CONFIG_BOOTP_HOSTNAME)
617 *e++ = 12; /* Host name request */
618 *e++ = 32;
619 e += 32;
620 #endif
621
622 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
623 *e++ = 13; /* Boot file size */
624 *e++ = 2;
625 e += 2;
626 #endif
627
628 #if defined(CONFIG_BOOTP_BOOTPATH)
629 *e++ = 17; /* Boot path */
630 *e++ = 32;
631 e += 32;
632 #endif
633
634 #if defined(CONFIG_BOOTP_NISDOMAIN)
635 *e++ = 40; /* NIS Domain name request */
636 *e++ = 32;
637 e += 32;
638 #endif
639 #if defined(CONFIG_BOOTP_NTPSERVER)
640 *e++ = 42;
641 *e++ = 4;
642 e += 4;
643 #endif
644
645 *e++ = 255; /* End of the list */
646
647 return e - start;
648 }
649 #endif
650
651 void BootpReset(void)
652 {
653 bootp_num_ids = 0;
654 BootpTry = 0;
655 bootp_start = get_timer(0);
656 bootp_timeout = 250;
657 }
658
659 void
660 BootpRequest(void)
661 {
662 uchar *pkt, *iphdr;
663 struct Bootp_t *bp;
664 int extlen, pktlen, iplen;
665 int eth_hdr_size;
666 #ifdef CONFIG_BOOTP_RANDOM_DELAY
667 ulong rand_ms;
668 #endif
669 ulong BootpID;
670 struct in_addr zero_ip;
671 struct in_addr bcast_ip;
672
673 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start");
674 #if defined(CONFIG_CMD_DHCP)
675 dhcp_state = INIT;
676 #endif
677
678 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */
679 if (BootpTry == 0)
680 srand_mac();
681
682 if (BootpTry <= 2) /* Start with max 1024 * 1ms */
683 rand_ms = rand() >> (22 - BootpTry);
684 else /* After 3rd BOOTP request max 8192 * 1ms */
685 rand_ms = rand() >> 19;
686
687 printf("Random delay: %ld ms...\n", rand_ms);
688 mdelay(rand_ms);
689
690 #endif /* CONFIG_BOOTP_RANDOM_DELAY */
691
692 printf("BOOTP broadcast %d\n", ++BootpTry);
693 pkt = NetTxPacket;
694 memset((void *)pkt, 0, PKTSIZE);
695
696 eth_hdr_size = NetSetEther(pkt, NetBcastAddr, PROT_IP);
697 pkt += eth_hdr_size;
698
699 /*
700 * Next line results in incorrect packet size being transmitted,
701 * resulting in errors in some DHCP servers, reporting missing bytes.
702 * Size must be set in packet header after extension length has been
703 * determined.
704 * C. Hallinan, DS4.COM, Inc.
705 */
706 /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC,
707 sizeof (struct Bootp_t)); */
708 iphdr = pkt; /* We need this later for net_set_udp_header() */
709 pkt += IP_UDP_HDR_SIZE;
710
711 bp = (struct Bootp_t *)pkt;
712 bp->bp_op = OP_BOOTREQUEST;
713 bp->bp_htype = HWT_ETHER;
714 bp->bp_hlen = HWL_ETHER;
715 bp->bp_hops = 0;
716 bp->bp_secs = htons(get_timer(0) / 1000);
717 zero_ip.s_addr = 0;
718 net_write_ip(&bp->bp_ciaddr, zero_ip);
719 net_write_ip(&bp->bp_yiaddr, zero_ip);
720 net_write_ip(&bp->bp_siaddr, zero_ip);
721 net_write_ip(&bp->bp_giaddr, zero_ip);
722 memcpy(bp->bp_chaddr, NetOurEther, 6);
723 copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
724
725 /* Request additional information from the BOOTP/DHCP server */
726 #if defined(CONFIG_CMD_DHCP)
727 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_DISCOVER, zero_ip,
728 zero_ip);
729 #else
730 extlen = bootp_extended((u8 *)bp->bp_vend);
731 #endif
732
733 /*
734 * Bootp ID is the lower 4 bytes of our ethernet address
735 * plus the current time in ms.
736 */
737 BootpID = ((ulong)NetOurEther[2] << 24)
738 | ((ulong)NetOurEther[3] << 16)
739 | ((ulong)NetOurEther[4] << 8)
740 | (ulong)NetOurEther[5];
741 BootpID += get_timer(0);
742 BootpID = htonl(BootpID);
743 bootp_add_id(BootpID);
744 NetCopyLong(&bp->bp_id, &BootpID);
745
746 /*
747 * Calculate proper packet lengths taking into account the
748 * variable size of the options field
749 */
750 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
751 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
752 bcast_ip.s_addr = 0xFFFFFFFFL;
753 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
754 NetSetTimeout(bootp_timeout, BootpTimeout);
755
756 #if defined(CONFIG_CMD_DHCP)
757 dhcp_state = SELECTING;
758 net_set_udp_handler(dhcp_handler);
759 #else
760 net_set_udp_handler(bootp_handler);
761 #endif
762 NetSendPacket(NetTxPacket, pktlen);
763 }
764
765 #if defined(CONFIG_CMD_DHCP)
766 static void DhcpOptionsProcess(uchar *popt, struct Bootp_t *bp)
767 {
768 uchar *end = popt + BOOTP_HDR_SIZE;
769 int oplen, size;
770 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
771 int *to_ptr;
772 #endif
773
774 while (popt < end && *popt != 0xff) {
775 oplen = *(popt + 1);
776 switch (*popt) {
777 case 1:
778 net_copy_ip(&net_netmask, (popt + 2));
779 break;
780 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
781 case 2: /* Time offset */
782 to_ptr = &NetTimeOffset;
783 NetCopyLong((ulong *)to_ptr, (ulong *)(popt + 2));
784 NetTimeOffset = ntohl(NetTimeOffset);
785 break;
786 #endif
787 case 3:
788 net_copy_ip(&net_gateway, (popt + 2));
789 break;
790 case 6:
791 net_copy_ip(&net_dns_server, (popt + 2));
792 #if defined(CONFIG_BOOTP_DNS2)
793 if (*(popt + 1) > 4)
794 net_copy_ip(&net_dns_server2, (popt + 2 + 4));
795 #endif
796 break;
797 case 12:
798 size = truncate_sz("Host Name",
799 sizeof(net_hostname), oplen);
800 memcpy(&net_hostname, popt + 2, size);
801 net_hostname[size] = 0;
802 break;
803 case 15: /* Ignore Domain Name Option */
804 break;
805 case 17:
806 size = truncate_sz("Root Path",
807 sizeof(net_root_path), oplen);
808 memcpy(&net_root_path, popt + 2, size);
809 net_root_path[size] = 0;
810 break;
811 case 28: /* Ignore Broadcast Address Option */
812 break;
813 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
814 case 42: /* NTP server IP */
815 net_copy_ip(&net_ntp_server, (popt + 2));
816 break;
817 #endif
818 case 51:
819 NetCopyLong(&dhcp_leasetime, (ulong *) (popt + 2));
820 break;
821 case 53: /* Ignore Message Type Option */
822 break;
823 case 54:
824 net_copy_ip(&dhcp_server_ip, (popt + 2));
825 break;
826 case 58: /* Ignore Renewal Time Option */
827 break;
828 case 59: /* Ignore Rebinding Time Option */
829 break;
830 case 66: /* Ignore TFTP server name */
831 break;
832 case 67: /* vendor opt bootfile */
833 /*
834 * I can't use dhcp_vendorex_proc here because I need
835 * to write into the bootp packet - even then I had to
836 * pass the bootp packet pointer into here as the
837 * second arg
838 */
839 size = truncate_sz("Opt Boot File",
840 sizeof(bp->bp_file),
841 oplen);
842 if (bp->bp_file[0] == '\0' && size > 0) {
843 /*
844 * only use vendor boot file if we didn't
845 * receive a boot file in the main non-vendor
846 * part of the packet - god only knows why
847 * some vendors chose not to use this perfectly
848 * good spot to store the boot file (join on
849 * Tru64 Unix) it seems mind bogglingly crazy
850 * to me
851 */
852 printf("*** WARNING: using vendor "
853 "optional boot file\n");
854 memcpy(bp->bp_file, popt + 2, size);
855 bp->bp_file[size] = '\0';
856 }
857 break;
858 default:
859 #if defined(CONFIG_BOOTP_VENDOREX)
860 if (dhcp_vendorex_proc(popt))
861 break;
862 #endif
863 printf("*** Unhandled DHCP Option in OFFER/ACK:"
864 " %d\n", *popt);
865 break;
866 }
867 popt += oplen + 2; /* Process next option */
868 }
869 }
870
871 static int DhcpMessageType(unsigned char *popt)
872 {
873 if (NetReadLong((ulong *)popt) != htonl(BOOTP_VENDOR_MAGIC))
874 return -1;
875
876 popt += 4;
877 while (*popt != 0xff) {
878 if (*popt == 53) /* DHCP Message Type */
879 return *(popt + 2);
880 popt += *(popt + 1) + 2; /* Scan through all options */
881 }
882 return -1;
883 }
884
885 static void DhcpSendRequestPkt(struct Bootp_t *bp_offer)
886 {
887 uchar *pkt, *iphdr;
888 struct Bootp_t *bp;
889 int pktlen, iplen, extlen;
890 int eth_hdr_size;
891 struct in_addr offered_ip;
892 struct in_addr zero_ip;
893 struct in_addr bcast_ip;
894
895 debug("DhcpSendRequestPkt: Sending DHCPREQUEST\n");
896 pkt = NetTxPacket;
897 memset((void *)pkt, 0, PKTSIZE);
898
899 eth_hdr_size = NetSetEther(pkt, NetBcastAddr, PROT_IP);
900 pkt += eth_hdr_size;
901
902 iphdr = pkt; /* We'll need this later to set proper pkt size */
903 pkt += IP_UDP_HDR_SIZE;
904
905 bp = (struct Bootp_t *)pkt;
906 bp->bp_op = OP_BOOTREQUEST;
907 bp->bp_htype = HWT_ETHER;
908 bp->bp_hlen = HWL_ETHER;
909 bp->bp_hops = 0;
910 bp->bp_secs = htons(get_timer(0) / 1000);
911 /* Do not set the client IP, your IP, or server IP yet, since it
912 * hasn't been ACK'ed by the server yet */
913
914 /*
915 * RFC3046 requires Relay Agents to discard packets with
916 * nonzero and offered giaddr
917 */
918 zero_ip.s_addr = 0;
919 net_write_ip(&bp->bp_giaddr, zero_ip);
920
921 memcpy(bp->bp_chaddr, NetOurEther, 6);
922
923 /*
924 * ID is the id of the OFFER packet
925 */
926
927 NetCopyLong(&bp->bp_id, &bp_offer->bp_id);
928
929 /*
930 * Copy options from OFFER packet if present
931 */
932
933 /* Copy offered IP into the parameters request list */
934 net_copy_ip(&offered_ip, &bp_offer->bp_yiaddr);
935 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST,
936 dhcp_server_ip, offered_ip);
937
938 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
939 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
940 bcast_ip.s_addr = 0xFFFFFFFFL;
941 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
942
943 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
944 udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
945 #endif /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
946 debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
947 NetSendPacket(NetTxPacket, pktlen);
948 }
949
950 /*
951 * Handle DHCP received packets.
952 */
953 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
954 unsigned src, unsigned len)
955 {
956 struct Bootp_t *bp = (struct Bootp_t *)pkt;
957
958 debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
959 src, dest, len, dhcp_state);
960
961 /* Filter out pkts we don't want */
962 if (BootpCheckPkt(pkt, dest, src, len))
963 return;
964
965 debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state:"
966 " %d\n", src, dest, len, dhcp_state);
967
968 switch (dhcp_state) {
969 case SELECTING:
970 /*
971 * Wait an appropriate time for any potential DHCPOFFER packets
972 * to arrive. Then select one, and generate DHCPREQUEST
973 * response. If filename is in format we recognize, assume it
974 * is a valid OFFER from a server we want.
975 */
976 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
977 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
978 if (strncmp(bp->bp_file,
979 CONFIG_SYS_BOOTFILE_PREFIX,
980 strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) {
981 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */
982
983 debug("TRANSITIONING TO REQUESTING STATE\n");
984 dhcp_state = REQUESTING;
985
986 if (NetReadLong((ulong *)&bp->bp_vend[0]) ==
987 htonl(BOOTP_VENDOR_MAGIC))
988 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
989
990 NetSetTimeout(5000, BootpTimeout);
991 DhcpSendRequestPkt(bp);
992 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
993 }
994 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */
995
996 return;
997 break;
998 case REQUESTING:
999 debug("DHCP State: REQUESTING\n");
1000
1001 if (DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK) {
1002 if (NetReadLong((ulong *)&bp->bp_vend[0]) ==
1003 htonl(BOOTP_VENDOR_MAGIC))
1004 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
1005 /* Store net params from reply */
1006 BootpCopyNetParams(bp);
1007 dhcp_state = BOUND;
1008 printf("DHCP client bound to address %pI4 (%lu ms)\n",
1009 &net_ip, get_timer(bootp_start));
1010 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP,
1011 "bootp_stop");
1012
1013 net_auto_load();
1014 return;
1015 }
1016 break;
1017 case BOUND:
1018 /* DHCP client bound to address */
1019 break;
1020 default:
1021 puts("DHCP: INVALID STATE\n");
1022 break;
1023 }
1024
1025 }
1026
1027 void DhcpRequest(void)
1028 {
1029 BootpRequest();
1030 }
1031 #endif /* CONFIG_CMD_DHCP */
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