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 static ulong time_taken_max; 64 65 #if defined(CONFIG_CMD_DHCP) 66 static dhcp_state_t dhcp_state = INIT; 67 static u32 dhcp_leasetime; 68 static struct in_addr dhcp_server_ip; 69 static u8 dhcp_option_overload; 70 #define OVERLOAD_FILE 1 71 #define OVERLOAD_SNAME 2 72 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip, 73 unsigned src, unsigned len); 74 75 /* For Debug */ 76 #if 0 77 static char *dhcpmsg2str(int type) 78 { 79 switch (type) { 80 case 1: return "DHCPDISCOVER"; break; 81 case 2: return "DHCPOFFER"; break; 82 case 3: return "DHCPREQUEST"; break; 83 case 4: return "DHCPDECLINE"; break; 84 case 5: return "DHCPACK"; break; 85 case 6: return "DHCPNACK"; break; 86 case 7: return "DHCPRELEASE"; break; 87 default: return "UNKNOWN/INVALID MSG TYPE"; break; 88 } 89 } 90 #endif 91 #endif 92 93 static void bootp_add_id(ulong id) 94 { 95 if (bootp_num_ids >= ARRAY_SIZE(bootp_ids)) { 96 size_t size = sizeof(bootp_ids) - sizeof(id); 97 98 memmove(bootp_ids, &bootp_ids[1], size); 99 bootp_ids[bootp_num_ids - 1] = id; 100 } else { 101 bootp_ids[bootp_num_ids] = id; 102 bootp_num_ids++; 103 } 104 } 105 106 static bool bootp_match_id(ulong id) 107 { 108 unsigned int i; 109 110 for (i = 0; i < bootp_num_ids; i++) 111 if (bootp_ids[i] == id) 112 return true; 113 114 return false; 115 } 116 117 static int check_reply_packet(uchar *pkt, unsigned dest, unsigned src, 118 unsigned len) 119 { 120 struct bootp_hdr *bp = (struct bootp_hdr *)pkt; 121 int retval = 0; 122 123 if (dest != PORT_BOOTPC || src != PORT_BOOTPS) 124 retval = -1; 125 else if (len < sizeof(struct bootp_hdr) - OPT_FIELD_SIZE) 126 retval = -2; 127 else if (bp->bp_op != OP_BOOTREPLY) 128 retval = -3; 129 else if (bp->bp_htype != HWT_ETHER) 130 retval = -4; 131 else if (bp->bp_hlen != HWL_ETHER) 132 retval = -5; 133 else if (!bootp_match_id(net_read_u32(&bp->bp_id))) 134 retval = -6; 135 else if (memcmp(bp->bp_chaddr, net_ethaddr, HWL_ETHER) != 0) 136 retval = -7; 137 138 debug("Filtering pkt = %d\n", retval); 139 140 return retval; 141 } 142 143 /* 144 * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet 145 */ 146 static void store_net_params(struct bootp_hdr *bp) 147 { 148 #if !defined(CONFIG_BOOTP_SERVERIP) 149 struct in_addr tmp_ip; 150 151 net_copy_ip(&tmp_ip, &bp->bp_siaddr); 152 if (tmp_ip.s_addr != 0) 153 net_copy_ip(&net_server_ip, &bp->bp_siaddr); 154 memcpy(net_server_ethaddr, 155 ((struct ethernet_hdr *)net_rx_packet)->et_src, 6); 156 if ( 157 #if defined(CONFIG_CMD_DHCP) 158 !(dhcp_option_overload & OVERLOAD_FILE) && 159 #endif 160 (strlen(bp->bp_file) > 0)) { 161 copy_filename(net_boot_file_name, bp->bp_file, 162 sizeof(net_boot_file_name)); 163 } 164 165 debug("net_boot_file_name: %s\n", net_boot_file_name); 166 167 /* Propagate to environment: 168 * don't delete exising entry when BOOTP / DHCP reply does 169 * not contain a new value 170 */ 171 if (*net_boot_file_name) 172 setenv("bootfile", net_boot_file_name); 173 #endif 174 net_copy_ip(&net_ip, &bp->bp_yiaddr); 175 } 176 177 static int truncate_sz(const char *name, int maxlen, int curlen) 178 { 179 if (curlen >= maxlen) { 180 printf("*** WARNING: %s is too long (%d - max: %d)" 181 " - truncated\n", name, curlen, maxlen); 182 curlen = maxlen - 1; 183 } 184 return curlen; 185 } 186 187 #if !defined(CONFIG_CMD_DHCP) 188 189 static void bootp_process_vendor_field(u8 *ext) 190 { 191 int size = *(ext + 1); 192 193 debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext, 194 *(ext + 1)); 195 196 net_boot_file_expected_size_in_blocks = 0; 197 198 switch (*ext) { 199 /* Fixed length fields */ 200 case 1: /* Subnet mask */ 201 if (net_netmask.s_addr == 0) 202 net_copy_ip(&net_netmask, (struct in_addr *)(ext + 2)); 203 break; 204 case 2: /* Time offset - Not yet supported */ 205 break; 206 /* Variable length fields */ 207 case 3: /* Gateways list */ 208 if (net_gateway.s_addr == 0) 209 net_copy_ip(&net_gateway, (struct in_addr *)(ext + 2)); 210 break; 211 case 4: /* Time server - Not yet supported */ 212 break; 213 case 5: /* IEN-116 name server - Not yet supported */ 214 break; 215 case 6: 216 if (net_dns_server.s_addr == 0) 217 net_copy_ip(&net_dns_server, 218 (struct in_addr *)(ext + 2)); 219 #if defined(CONFIG_BOOTP_DNS2) 220 if ((net_dns_server2.s_addr == 0) && (size > 4)) 221 net_copy_ip(&net_dns_server2, 222 (struct in_addr *)(ext + 2 + 4)); 223 #endif 224 break; 225 case 7: /* Log server - Not yet supported */ 226 break; 227 case 8: /* Cookie/Quote server - Not yet supported */ 228 break; 229 case 9: /* LPR server - Not yet supported */ 230 break; 231 case 10: /* Impress server - Not yet supported */ 232 break; 233 case 11: /* RPL server - Not yet supported */ 234 break; 235 case 12: /* Host name */ 236 if (net_hostname[0] == 0) { 237 size = truncate_sz("Host Name", 238 sizeof(net_hostname), size); 239 memcpy(&net_hostname, ext + 2, size); 240 net_hostname[size] = 0; 241 } 242 break; 243 case 13: /* Boot file size */ 244 if (size == 2) 245 net_boot_file_expected_size_in_blocks = 246 ntohs(*(ushort *)(ext + 2)); 247 else if (size == 4) 248 net_boot_file_expected_size_in_blocks = 249 ntohl(*(ulong *)(ext + 2)); 250 break; 251 case 14: /* Merit dump file - Not yet supported */ 252 break; 253 case 15: /* Domain name - Not yet supported */ 254 break; 255 case 16: /* Swap server - Not yet supported */ 256 break; 257 case 17: /* Root path */ 258 if (net_root_path[0] == 0) { 259 size = truncate_sz("Root Path", 260 sizeof(net_root_path), size); 261 memcpy(&net_root_path, ext + 2, size); 262 net_root_path[size] = 0; 263 } 264 break; 265 case 18: /* Extension path - Not yet supported */ 266 /* 267 * This can be used to send the information of the 268 * vendor area in another file that the client can 269 * access via TFTP. 270 */ 271 break; 272 /* IP host layer fields */ 273 case 40: /* NIS Domain name */ 274 if (net_nis_domain[0] == 0) { 275 size = truncate_sz("NIS Domain Name", 276 sizeof(net_nis_domain), size); 277 memcpy(&net_nis_domain, ext + 2, size); 278 net_nis_domain[size] = 0; 279 } 280 break; 281 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 282 case 42: /* NTP server IP */ 283 net_copy_ip(&net_ntp_server, (struct in_addr *)(ext + 2)); 284 break; 285 #endif 286 /* Application layer fields */ 287 case 43: /* Vendor specific info - Not yet supported */ 288 /* 289 * Binary information to exchange specific 290 * product information. 291 */ 292 break; 293 /* Reserved (custom) fields (128..254) */ 294 } 295 } 296 297 static void bootp_process_vendor(u8 *ext, int size) 298 { 299 u8 *end = ext + size; 300 301 debug("[BOOTP] Checking extension (%d bytes)...\n", size); 302 303 while ((ext < end) && (*ext != 0xff)) { 304 if (*ext == 0) { 305 ext++; 306 } else { 307 u8 *opt = ext; 308 309 ext += ext[1] + 2; 310 if (ext <= end) 311 bootp_process_vendor_field(opt); 312 } 313 } 314 315 debug("[BOOTP] Received fields:\n"); 316 if (net_netmask.s_addr) 317 debug("net_netmask : %pI4\n", &net_netmask); 318 319 if (net_gateway.s_addr) 320 debug("net_gateway : %pI4", &net_gateway); 321 322 if (net_boot_file_expected_size_in_blocks) 323 debug("net_boot_file_expected_size_in_blocks : %d\n", 324 net_boot_file_expected_size_in_blocks); 325 326 if (net_hostname[0]) 327 debug("net_hostname : %s\n", net_hostname); 328 329 if (net_root_path[0]) 330 debug("net_root_path : %s\n", net_root_path); 331 332 if (net_nis_domain[0]) 333 debug("net_nis_domain : %s\n", net_nis_domain); 334 335 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 336 if (net_ntp_server) 337 debug("net_ntp_server : %pI4\n", &net_ntp_server); 338 #endif 339 } 340 341 /* 342 * Handle a BOOTP received packet. 343 */ 344 static void bootp_handler(uchar *pkt, unsigned dest, struct in_addr sip, 345 unsigned src, unsigned len) 346 { 347 struct bootp_hdr *bp; 348 349 debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n", 350 src, dest, len, sizeof(struct bootp_hdr)); 351 352 bp = (struct bootp_hdr *)pkt; 353 354 /* Filter out pkts we don't want */ 355 if (check_reply_packet(pkt, dest, src, len)) 356 return; 357 358 /* 359 * Got a good BOOTP reply. Copy the data into our variables. 360 */ 361 #if defined(CONFIG_STATUS_LED) && defined(STATUS_LED_BOOT) 362 status_led_set(STATUS_LED_BOOT, STATUS_LED_OFF); 363 #endif 364 365 store_net_params(bp); /* Store net parameters from reply */ 366 367 /* Retrieve extended information (we must parse the vendor area) */ 368 if (net_read_u32((u32 *)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 369 bootp_process_vendor((uchar *)&bp->bp_vend[4], len); 370 371 net_set_timeout_handler(0, (thand_f *)0); 372 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop"); 373 374 debug("Got good BOOTP\n"); 375 376 net_auto_load(); 377 } 378 #endif 379 380 /* 381 * Timeout on BOOTP/DHCP request. 382 */ 383 static void bootp_timeout_handler(void) 384 { 385 ulong time_taken = get_timer(bootp_start); 386 387 if (time_taken >= time_taken_max) { 388 #ifdef CONFIG_BOOTP_MAY_FAIL 389 puts("\nRetry time exceeded\n"); 390 net_set_state(NETLOOP_FAIL); 391 #else 392 puts("\nRetry time exceeded; starting again\n"); 393 net_start_again(); 394 #endif 395 } else { 396 bootp_timeout *= 2; 397 if (bootp_timeout > 2000) 398 bootp_timeout = 2000; 399 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler); 400 bootp_request(); 401 } 402 } 403 404 #define put_vci(e, str) \ 405 do { \ 406 size_t vci_strlen = strlen(str); \ 407 *e++ = 60; /* Vendor Class Identifier */ \ 408 *e++ = vci_strlen; \ 409 memcpy(e, str, vci_strlen); \ 410 e += vci_strlen; \ 411 } while (0) 412 413 /* 414 * Initialize BOOTP extension fields in the request. 415 */ 416 #if defined(CONFIG_CMD_DHCP) 417 static int dhcp_extended(u8 *e, int message_type, struct in_addr server_ip, 418 struct in_addr requested_ip) 419 { 420 u8 *start = e; 421 u8 *cnt; 422 #if defined(CONFIG_BOOTP_PXE) 423 char *uuid; 424 u16 clientarch; 425 #endif 426 427 #if defined(CONFIG_BOOTP_VENDOREX) 428 u8 *x; 429 #endif 430 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 431 char *hostname; 432 #endif 433 434 *e++ = 99; /* RFC1048 Magic Cookie */ 435 *e++ = 130; 436 *e++ = 83; 437 *e++ = 99; 438 439 *e++ = 53; /* DHCP Message Type */ 440 *e++ = 1; 441 *e++ = message_type; 442 443 *e++ = 57; /* Maximum DHCP Message Size */ 444 *e++ = 2; 445 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 8; 446 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff; 447 448 if (server_ip.s_addr) { 449 int tmp = ntohl(server_ip.s_addr); 450 451 *e++ = 54; /* ServerID */ 452 *e++ = 4; 453 *e++ = tmp >> 24; 454 *e++ = tmp >> 16; 455 *e++ = tmp >> 8; 456 *e++ = tmp & 0xff; 457 } 458 459 if (requested_ip.s_addr) { 460 int tmp = ntohl(requested_ip.s_addr); 461 462 *e++ = 50; /* Requested IP */ 463 *e++ = 4; 464 *e++ = tmp >> 24; 465 *e++ = tmp >> 16; 466 *e++ = tmp >> 8; 467 *e++ = tmp & 0xff; 468 } 469 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 470 hostname = getenv("hostname"); 471 if (hostname) { 472 int hostnamelen = strlen(hostname); 473 474 *e++ = 12; /* Hostname */ 475 *e++ = hostnamelen; 476 memcpy(e, hostname, hostnamelen); 477 e += hostnamelen; 478 } 479 #endif 480 481 #if defined(CONFIG_BOOTP_PXE) 482 clientarch = CONFIG_BOOTP_PXE_CLIENTARCH; 483 *e++ = 93; /* Client System Architecture */ 484 *e++ = 2; 485 *e++ = (clientarch >> 8) & 0xff; 486 *e++ = clientarch & 0xff; 487 488 *e++ = 94; /* Client Network Interface Identifier */ 489 *e++ = 3; 490 *e++ = 1; /* type field for UNDI */ 491 *e++ = 0; /* major revision */ 492 *e++ = 0; /* minor revision */ 493 494 uuid = getenv("pxeuuid"); 495 496 if (uuid) { 497 if (uuid_str_valid(uuid)) { 498 *e++ = 97; /* Client Machine Identifier */ 499 *e++ = 17; 500 *e++ = 0; /* type 0 - UUID */ 501 502 uuid_str_to_bin(uuid, e, UUID_STR_FORMAT_STD); 503 e += 16; 504 } else { 505 printf("Invalid pxeuuid: %s\n", uuid); 506 } 507 } 508 #endif 509 510 #if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING) 511 put_vci(e, CONFIG_SPL_NET_VCI_STRING); 512 #elif defined(CONFIG_BOOTP_VCI_STRING) 513 put_vci(e, CONFIG_BOOTP_VCI_STRING); 514 #endif 515 516 #if defined(CONFIG_BOOTP_VENDOREX) 517 x = dhcp_vendorex_prep(e); 518 if (x) 519 return x - start; 520 #endif 521 522 *e++ = 55; /* Parameter Request List */ 523 cnt = e++; /* Pointer to count of requested items */ 524 *cnt = 0; 525 #if defined(CONFIG_BOOTP_SUBNETMASK) 526 *e++ = 1; /* Subnet Mask */ 527 *cnt += 1; 528 #endif 529 #if defined(CONFIG_BOOTP_TIMEOFFSET) 530 *e++ = 2; 531 *cnt += 1; 532 #endif 533 #if defined(CONFIG_BOOTP_GATEWAY) 534 *e++ = 3; /* Router Option */ 535 *cnt += 1; 536 #endif 537 #if defined(CONFIG_BOOTP_DNS) 538 *e++ = 6; /* DNS Server(s) */ 539 *cnt += 1; 540 #endif 541 #if defined(CONFIG_BOOTP_HOSTNAME) 542 *e++ = 12; /* Hostname */ 543 *cnt += 1; 544 #endif 545 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 546 *e++ = 13; /* Boot File Size */ 547 *cnt += 1; 548 #endif 549 #if defined(CONFIG_BOOTP_BOOTPATH) 550 *e++ = 17; /* Boot path */ 551 *cnt += 1; 552 #endif 553 #if defined(CONFIG_BOOTP_NISDOMAIN) 554 *e++ = 40; /* NIS Domain name request */ 555 *cnt += 1; 556 #endif 557 #if defined(CONFIG_BOOTP_NTPSERVER) 558 *e++ = 42; 559 *cnt += 1; 560 #endif 561 /* no options, so back up to avoid sending an empty request list */ 562 if (*cnt == 0) 563 e -= 2; 564 565 *e++ = 255; /* End of the list */ 566 567 /* Pad to minimal length */ 568 #ifdef CONFIG_DHCP_MIN_EXT_LEN 569 while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN) 570 *e++ = 0; 571 #endif 572 573 return e - start; 574 } 575 576 #else 577 /* 578 * Warning: no field size check - change CONFIG_BOOTP_* at your own risk! 579 */ 580 static int bootp_extended(u8 *e) 581 { 582 u8 *start = e; 583 584 *e++ = 99; /* RFC1048 Magic Cookie */ 585 *e++ = 130; 586 *e++ = 83; 587 *e++ = 99; 588 589 #if defined(CONFIG_CMD_DHCP) 590 *e++ = 53; /* DHCP Message Type */ 591 *e++ = 1; 592 *e++ = DHCP_DISCOVER; 593 594 *e++ = 57; /* Maximum DHCP Message Size */ 595 *e++ = 2; 596 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 16; 597 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff; 598 #endif 599 600 #if defined(CONFIG_BOOTP_VCI_STRING) || \ 601 (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING)) 602 #ifdef CONFIG_SPL_BUILD 603 put_vci(e, CONFIG_SPL_NET_VCI_STRING); 604 #else 605 put_vci(e, CONFIG_BOOTP_VCI_STRING); 606 #endif 607 #endif 608 609 #if defined(CONFIG_BOOTP_SUBNETMASK) 610 *e++ = 1; /* Subnet mask request */ 611 *e++ = 4; 612 e += 4; 613 #endif 614 615 #if defined(CONFIG_BOOTP_GATEWAY) 616 *e++ = 3; /* Default gateway request */ 617 *e++ = 4; 618 e += 4; 619 #endif 620 621 #if defined(CONFIG_BOOTP_DNS) 622 *e++ = 6; /* Domain Name Server */ 623 *e++ = 4; 624 e += 4; 625 #endif 626 627 #if defined(CONFIG_BOOTP_HOSTNAME) 628 *e++ = 12; /* Host name request */ 629 *e++ = 32; 630 e += 32; 631 #endif 632 633 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 634 *e++ = 13; /* Boot file size */ 635 *e++ = 2; 636 e += 2; 637 #endif 638 639 #if defined(CONFIG_BOOTP_BOOTPATH) 640 *e++ = 17; /* Boot path */ 641 *e++ = 32; 642 e += 32; 643 #endif 644 645 #if defined(CONFIG_BOOTP_NISDOMAIN) 646 *e++ = 40; /* NIS Domain name request */ 647 *e++ = 32; 648 e += 32; 649 #endif 650 #if defined(CONFIG_BOOTP_NTPSERVER) 651 *e++ = 42; 652 *e++ = 4; 653 e += 4; 654 #endif 655 656 *e++ = 255; /* End of the list */ 657 658 return e - start; 659 } 660 #endif 661 662 void bootp_reset(void) 663 { 664 bootp_num_ids = 0; 665 bootp_try = 0; 666 bootp_start = get_timer(0); 667 bootp_timeout = 250; 668 } 669 670 void bootp_request(void) 671 { 672 uchar *pkt, *iphdr; 673 struct bootp_hdr *bp; 674 int extlen, pktlen, iplen; 675 int eth_hdr_size; 676 #ifdef CONFIG_BOOTP_RANDOM_DELAY 677 ulong rand_ms; 678 #endif 679 u32 bootp_id; 680 struct in_addr zero_ip; 681 struct in_addr bcast_ip; 682 char *ep; /* Environment pointer */ 683 684 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start"); 685 #if defined(CONFIG_CMD_DHCP) 686 dhcp_state = INIT; 687 #endif 688 689 ep = getenv("bootpretryperiod"); 690 if (ep != NULL) 691 time_taken_max = simple_strtoul(ep, NULL, 10); 692 else 693 time_taken_max = TIMEOUT_MS; 694 695 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */ 696 if (bootp_try == 0) 697 srand_mac(); 698 699 if (bootp_try <= 2) /* Start with max 1024 * 1ms */ 700 rand_ms = rand() >> (22 - bootp_try); 701 else /* After 3rd BOOTP request max 8192 * 1ms */ 702 rand_ms = rand() >> 19; 703 704 printf("Random delay: %ld ms...\n", rand_ms); 705 mdelay(rand_ms); 706 707 #endif /* CONFIG_BOOTP_RANDOM_DELAY */ 708 709 printf("BOOTP broadcast %d\n", ++bootp_try); 710 pkt = net_tx_packet; 711 memset((void *)pkt, 0, PKTSIZE); 712 713 eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP); 714 pkt += eth_hdr_size; 715 716 /* 717 * Next line results in incorrect packet size being transmitted, 718 * resulting in errors in some DHCP servers, reporting missing bytes. 719 * Size must be set in packet header after extension length has been 720 * determined. 721 * C. Hallinan, DS4.COM, Inc. 722 */ 723 /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, 724 sizeof (struct bootp_hdr)); */ 725 iphdr = pkt; /* We need this later for net_set_udp_header() */ 726 pkt += IP_UDP_HDR_SIZE; 727 728 bp = (struct bootp_hdr *)pkt; 729 bp->bp_op = OP_BOOTREQUEST; 730 bp->bp_htype = HWT_ETHER; 731 bp->bp_hlen = HWL_ETHER; 732 bp->bp_hops = 0; 733 /* 734 * according to RFC1542, should be 0 on first request, secs since 735 * first request otherwise 736 */ 737 bp->bp_secs = htons(get_timer(bootp_start) / 1000); 738 zero_ip.s_addr = 0; 739 net_write_ip(&bp->bp_ciaddr, zero_ip); 740 net_write_ip(&bp->bp_yiaddr, zero_ip); 741 net_write_ip(&bp->bp_siaddr, zero_ip); 742 net_write_ip(&bp->bp_giaddr, zero_ip); 743 memcpy(bp->bp_chaddr, net_ethaddr, 6); 744 copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file)); 745 746 /* Request additional information from the BOOTP/DHCP server */ 747 #if defined(CONFIG_CMD_DHCP) 748 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_DISCOVER, zero_ip, 749 zero_ip); 750 #else 751 extlen = bootp_extended((u8 *)bp->bp_vend); 752 #endif 753 754 /* 755 * Bootp ID is the lower 4 bytes of our ethernet address 756 * plus the current time in ms. 757 */ 758 bootp_id = ((u32)net_ethaddr[2] << 24) 759 | ((u32)net_ethaddr[3] << 16) 760 | ((u32)net_ethaddr[4] << 8) 761 | (u32)net_ethaddr[5]; 762 bootp_id += get_timer(0); 763 bootp_id = htonl(bootp_id); 764 bootp_add_id(bootp_id); 765 net_copy_u32(&bp->bp_id, &bootp_id); 766 767 /* 768 * Calculate proper packet lengths taking into account the 769 * variable size of the options field 770 */ 771 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen; 772 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen; 773 bcast_ip.s_addr = 0xFFFFFFFFL; 774 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen); 775 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler); 776 777 #if defined(CONFIG_CMD_DHCP) 778 dhcp_state = SELECTING; 779 net_set_udp_handler(dhcp_handler); 780 #else 781 net_set_udp_handler(bootp_handler); 782 #endif 783 net_send_packet(net_tx_packet, pktlen); 784 } 785 786 #if defined(CONFIG_CMD_DHCP) 787 static void dhcp_process_options(uchar *popt, uchar *end) 788 { 789 int oplen, size; 790 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 791 int *to_ptr; 792 #endif 793 794 while (popt < end && *popt != 0xff) { 795 oplen = *(popt + 1); 796 switch (*popt) { 797 case 0: 798 oplen = -1; /* Pad omits len byte */ 799 break; 800 case 1: 801 net_copy_ip(&net_netmask, (popt + 2)); 802 break; 803 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 804 case 2: /* Time offset */ 805 to_ptr = &net_ntp_time_offset; 806 net_copy_u32((u32 *)to_ptr, (u32 *)(popt + 2)); 807 net_ntp_time_offset = ntohl(net_ntp_time_offset); 808 break; 809 #endif 810 case 3: 811 net_copy_ip(&net_gateway, (popt + 2)); 812 break; 813 case 6: 814 net_copy_ip(&net_dns_server, (popt + 2)); 815 #if defined(CONFIG_BOOTP_DNS2) 816 if (*(popt + 1) > 4) 817 net_copy_ip(&net_dns_server2, (popt + 2 + 4)); 818 #endif 819 break; 820 case 12: 821 size = truncate_sz("Host Name", 822 sizeof(net_hostname), oplen); 823 memcpy(&net_hostname, popt + 2, size); 824 net_hostname[size] = 0; 825 break; 826 case 15: /* Ignore Domain Name Option */ 827 break; 828 case 17: 829 size = truncate_sz("Root Path", 830 sizeof(net_root_path), oplen); 831 memcpy(&net_root_path, popt + 2, size); 832 net_root_path[size] = 0; 833 break; 834 case 28: /* Ignore Broadcast Address Option */ 835 break; 836 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 837 case 42: /* NTP server IP */ 838 net_copy_ip(&net_ntp_server, (popt + 2)); 839 break; 840 #endif 841 case 51: 842 net_copy_u32(&dhcp_leasetime, (u32 *)(popt + 2)); 843 break; 844 case 52: 845 dhcp_option_overload = popt[2]; 846 break; 847 case 53: /* Ignore Message Type Option */ 848 break; 849 case 54: 850 net_copy_ip(&dhcp_server_ip, (popt + 2)); 851 break; 852 case 58: /* Ignore Renewal Time Option */ 853 break; 854 case 59: /* Ignore Rebinding Time Option */ 855 break; 856 case 66: /* Ignore TFTP server name */ 857 break; 858 case 67: /* Bootfile option */ 859 size = truncate_sz("Bootfile", 860 sizeof(net_boot_file_name), oplen); 861 memcpy(&net_boot_file_name, popt + 2, size); 862 net_boot_file_name[size] = 0; 863 break; 864 default: 865 #if defined(CONFIG_BOOTP_VENDOREX) 866 if (dhcp_vendorex_proc(popt)) 867 break; 868 #endif 869 printf("*** Unhandled DHCP Option in OFFER/ACK:" 870 " %d\n", *popt); 871 break; 872 } 873 popt += oplen + 2; /* Process next option */ 874 } 875 } 876 877 static void dhcp_packet_process_options(struct bootp_hdr *bp) 878 { 879 uchar *popt = (uchar *)&bp->bp_vend[4]; 880 uchar *end = popt + BOOTP_HDR_SIZE; 881 882 if (net_read_u32((u32 *)&bp->bp_vend[0]) != htonl(BOOTP_VENDOR_MAGIC)) 883 return; 884 885 dhcp_option_overload = 0; 886 887 /* 888 * The 'options' field MUST be interpreted first, 'file' next, 889 * 'sname' last. 890 */ 891 dhcp_process_options(popt, end); 892 893 if (dhcp_option_overload & OVERLOAD_FILE) { 894 popt = (uchar *)bp->bp_file; 895 end = popt + sizeof(bp->bp_file); 896 dhcp_process_options(popt, end); 897 } 898 899 if (dhcp_option_overload & OVERLOAD_SNAME) { 900 popt = (uchar *)bp->bp_sname; 901 end = popt + sizeof(bp->bp_sname); 902 dhcp_process_options(popt, end); 903 } 904 } 905 906 static int dhcp_message_type(unsigned char *popt) 907 { 908 if (net_read_u32((u32 *)popt) != htonl(BOOTP_VENDOR_MAGIC)) 909 return -1; 910 911 popt += 4; 912 while (*popt != 0xff) { 913 if (*popt == 53) /* DHCP Message Type */ 914 return *(popt + 2); 915 if (*popt == 0) { 916 /* Pad */ 917 popt += 1; 918 } else { 919 /* Scan through all options */ 920 popt += *(popt + 1) + 2; 921 } 922 } 923 return -1; 924 } 925 926 static void dhcp_send_request_packet(struct bootp_hdr *bp_offer) 927 { 928 uchar *pkt, *iphdr; 929 struct bootp_hdr *bp; 930 int pktlen, iplen, extlen; 931 int eth_hdr_size; 932 struct in_addr offered_ip; 933 struct in_addr zero_ip; 934 struct in_addr bcast_ip; 935 936 debug("dhcp_send_request_packet: Sending DHCPREQUEST\n"); 937 pkt = net_tx_packet; 938 memset((void *)pkt, 0, PKTSIZE); 939 940 eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP); 941 pkt += eth_hdr_size; 942 943 iphdr = pkt; /* We'll need this later to set proper pkt size */ 944 pkt += IP_UDP_HDR_SIZE; 945 946 bp = (struct bootp_hdr *)pkt; 947 bp->bp_op = OP_BOOTREQUEST; 948 bp->bp_htype = HWT_ETHER; 949 bp->bp_hlen = HWL_ETHER; 950 bp->bp_hops = 0; 951 bp->bp_secs = htons(get_timer(bootp_start) / 1000); 952 /* Do not set the client IP, your IP, or server IP yet, since it 953 * hasn't been ACK'ed by the server yet */ 954 955 /* 956 * RFC3046 requires Relay Agents to discard packets with 957 * nonzero and offered giaddr 958 */ 959 zero_ip.s_addr = 0; 960 net_write_ip(&bp->bp_giaddr, zero_ip); 961 962 memcpy(bp->bp_chaddr, net_ethaddr, 6); 963 copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file)); 964 965 /* 966 * ID is the id of the OFFER packet 967 */ 968 969 net_copy_u32(&bp->bp_id, &bp_offer->bp_id); 970 971 /* 972 * Copy options from OFFER packet if present 973 */ 974 975 /* Copy offered IP into the parameters request list */ 976 net_copy_ip(&offered_ip, &bp_offer->bp_yiaddr); 977 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST, 978 dhcp_server_ip, offered_ip); 979 980 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen; 981 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen; 982 bcast_ip.s_addr = 0xFFFFFFFFL; 983 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen); 984 985 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY 986 udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY); 987 #endif /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */ 988 debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen); 989 net_send_packet(net_tx_packet, pktlen); 990 } 991 992 /* 993 * Handle DHCP received packets. 994 */ 995 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip, 996 unsigned src, unsigned len) 997 { 998 struct bootp_hdr *bp = (struct bootp_hdr *)pkt; 999 1000 debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n", 1001 src, dest, len, dhcp_state); 1002 1003 /* Filter out pkts we don't want */ 1004 if (check_reply_packet(pkt, dest, src, len)) 1005 return; 1006 1007 debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: " 1008 "%d\n", src, dest, len, dhcp_state); 1009 1010 if (net_read_ip(&bp->bp_yiaddr).s_addr == 0) 1011 return; 1012 1013 switch (dhcp_state) { 1014 case SELECTING: 1015 /* 1016 * Wait an appropriate time for any potential DHCPOFFER packets 1017 * to arrive. Then select one, and generate DHCPREQUEST 1018 * response. If filename is in format we recognize, assume it 1019 * is a valid OFFER from a server we want. 1020 */ 1021 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file); 1022 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 1023 if (strncmp(bp->bp_file, 1024 CONFIG_SYS_BOOTFILE_PREFIX, 1025 strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) { 1026 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 1027 dhcp_packet_process_options(bp); 1028 1029 debug("TRANSITIONING TO REQUESTING STATE\n"); 1030 dhcp_state = REQUESTING; 1031 1032 net_set_timeout_handler(5000, bootp_timeout_handler); 1033 dhcp_send_request_packet(bp); 1034 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 1035 } 1036 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 1037 1038 return; 1039 break; 1040 case REQUESTING: 1041 debug("DHCP State: REQUESTING\n"); 1042 1043 if (dhcp_message_type((u8 *)bp->bp_vend) == DHCP_ACK) { 1044 dhcp_packet_process_options(bp); 1045 /* Store net params from reply */ 1046 store_net_params(bp); 1047 dhcp_state = BOUND; 1048 printf("DHCP client bound to address %pI4 (%lu ms)\n", 1049 &net_ip, get_timer(bootp_start)); 1050 net_set_timeout_handler(0, (thand_f *)0); 1051 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, 1052 "bootp_stop"); 1053 1054 net_auto_load(); 1055 return; 1056 } 1057 break; 1058 case BOUND: 1059 /* DHCP client bound to address */ 1060 break; 1061 default: 1062 puts("DHCP: INVALID STATE\n"); 1063 break; 1064 } 1065 } 1066 1067 void dhcp_request(void) 1068 { 1069 bootp_request(); 1070 } 1071 #endif /* CONFIG_CMD_DHCP */ 1072