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_reply_packet(uchar *pkt, unsigned dest, unsigned src, 113 unsigned len) 114 { 115 struct bootp_hdr *bp = (struct bootp_hdr *)pkt; 116 int retval = 0; 117 118 if (dest != PORT_BOOTPC || src != PORT_BOOTPS) 119 retval = -1; 120 else if (len < sizeof(struct bootp_hdr) - OPT_FIELD_SIZE) 121 retval = -2; 122 else if (bp->bp_op != OP_BOOTREPLY) 123 retval = -3; 124 else if (bp->bp_htype != HWT_ETHER) 125 retval = -4; 126 else if (bp->bp_hlen != HWL_ETHER) 127 retval = -5; 128 else if (!bootp_match_id(net_read_u32(&bp->bp_id))) 129 retval = -6; 130 131 debug("Filtering pkt = %d\n", retval); 132 133 return retval; 134 } 135 136 /* 137 * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet 138 */ 139 static void store_net_params(struct bootp_hdr *bp) 140 { 141 #if !defined(CONFIG_BOOTP_SERVERIP) 142 struct in_addr tmp_ip; 143 144 net_copy_ip(&tmp_ip, &bp->bp_siaddr); 145 if (tmp_ip.s_addr != 0) 146 net_copy_ip(&net_server_ip, &bp->bp_siaddr); 147 memcpy(net_server_ethaddr, 148 ((struct ethernet_hdr *)net_rx_packet)->et_src, 6); 149 if (strlen(bp->bp_file) > 0) 150 copy_filename(net_boot_file_name, bp->bp_file, 151 sizeof(net_boot_file_name)); 152 153 debug("net_boot_file_name: %s\n", net_boot_file_name); 154 155 /* Propagate to environment: 156 * don't delete exising entry when BOOTP / DHCP reply does 157 * not contain a new value 158 */ 159 if (*net_boot_file_name) 160 setenv("bootfile", net_boot_file_name); 161 #endif 162 net_copy_ip(&net_ip, &bp->bp_yiaddr); 163 } 164 165 static int truncate_sz(const char *name, int maxlen, int curlen) 166 { 167 if (curlen >= maxlen) { 168 printf("*** WARNING: %s is too long (%d - max: %d)" 169 " - truncated\n", name, curlen, maxlen); 170 curlen = maxlen - 1; 171 } 172 return curlen; 173 } 174 175 #if !defined(CONFIG_CMD_DHCP) 176 177 static void bootp_process_vendor_field(u8 *ext) 178 { 179 int size = *(ext + 1); 180 181 debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext, 182 *(ext + 1)); 183 184 net_boot_file_expected_size_in_blocks = 0; 185 186 switch (*ext) { 187 /* Fixed length fields */ 188 case 1: /* Subnet mask */ 189 if (net_netmask.s_addr == 0) 190 net_copy_ip(&net_netmask, (struct in_addr *)(ext + 2)); 191 break; 192 case 2: /* Time offset - Not yet supported */ 193 break; 194 /* Variable length fields */ 195 case 3: /* Gateways list */ 196 if (net_gateway.s_addr == 0) 197 net_copy_ip(&net_gateway, (struct in_addr *)(ext + 2)); 198 break; 199 case 4: /* Time server - Not yet supported */ 200 break; 201 case 5: /* IEN-116 name server - Not yet supported */ 202 break; 203 case 6: 204 if (net_dns_server.s_addr == 0) 205 net_copy_ip(&net_dns_server, 206 (struct in_addr *)(ext + 2)); 207 #if defined(CONFIG_BOOTP_DNS2) 208 if ((net_dns_server2.s_addr == 0) && (size > 4)) 209 net_copy_ip(&net_dns_server2, 210 (struct in_addr *)(ext + 2 + 4)); 211 #endif 212 break; 213 case 7: /* Log server - Not yet supported */ 214 break; 215 case 8: /* Cookie/Quote server - Not yet supported */ 216 break; 217 case 9: /* LPR server - Not yet supported */ 218 break; 219 case 10: /* Impress server - Not yet supported */ 220 break; 221 case 11: /* RPL server - Not yet supported */ 222 break; 223 case 12: /* Host name */ 224 if (net_hostname[0] == 0) { 225 size = truncate_sz("Host Name", 226 sizeof(net_hostname), size); 227 memcpy(&net_hostname, ext + 2, size); 228 net_hostname[size] = 0; 229 } 230 break; 231 case 13: /* Boot file size */ 232 if (size == 2) 233 net_boot_file_expected_size_in_blocks = 234 ntohs(*(ushort *)(ext + 2)); 235 else if (size == 4) 236 net_boot_file_expected_size_in_blocks = 237 ntohl(*(ulong *)(ext + 2)); 238 break; 239 case 14: /* Merit dump file - Not yet supported */ 240 break; 241 case 15: /* Domain name - Not yet supported */ 242 break; 243 case 16: /* Swap server - Not yet supported */ 244 break; 245 case 17: /* Root path */ 246 if (net_root_path[0] == 0) { 247 size = truncate_sz("Root Path", 248 sizeof(net_root_path), size); 249 memcpy(&net_root_path, ext + 2, size); 250 net_root_path[size] = 0; 251 } 252 break; 253 case 18: /* Extension path - Not yet supported */ 254 /* 255 * This can be used to send the information of the 256 * vendor area in another file that the client can 257 * access via TFTP. 258 */ 259 break; 260 /* IP host layer fields */ 261 case 40: /* NIS Domain name */ 262 if (net_nis_domain[0] == 0) { 263 size = truncate_sz("NIS Domain Name", 264 sizeof(net_nis_domain), size); 265 memcpy(&net_nis_domain, ext + 2, size); 266 net_nis_domain[size] = 0; 267 } 268 break; 269 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 270 case 42: /* NTP server IP */ 271 net_copy_ip(&net_ntp_server, (struct in_addr *)(ext + 2)); 272 break; 273 #endif 274 /* Application layer fields */ 275 case 43: /* Vendor specific info - Not yet supported */ 276 /* 277 * Binary information to exchange specific 278 * product information. 279 */ 280 break; 281 /* Reserved (custom) fields (128..254) */ 282 } 283 } 284 285 static void bootp_process_vendor(u8 *ext, int size) 286 { 287 u8 *end = ext + size; 288 289 debug("[BOOTP] Checking extension (%d bytes)...\n", size); 290 291 while ((ext < end) && (*ext != 0xff)) { 292 if (*ext == 0) { 293 ext++; 294 } else { 295 u8 *opt = ext; 296 297 ext += ext[1] + 2; 298 if (ext <= end) 299 bootp_process_vendor_field(opt); 300 } 301 } 302 303 debug("[BOOTP] Received fields:\n"); 304 if (net_netmask.s_addr) 305 debug("net_netmask : %pI4\n", &net_netmask); 306 307 if (net_gateway.s_addr) 308 debug("net_gateway : %pI4", &net_gateway); 309 310 if (net_boot_file_expected_size_in_blocks) 311 debug("net_boot_file_expected_size_in_blocks : %d\n", 312 net_boot_file_expected_size_in_blocks); 313 314 if (net_hostname[0]) 315 debug("net_hostname : %s\n", net_hostname); 316 317 if (net_root_path[0]) 318 debug("net_root_path : %s\n", net_root_path); 319 320 if (net_nis_domain[0]) 321 debug("net_nis_domain : %s\n", net_nis_domain); 322 323 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 324 if (net_ntp_server) 325 debug("net_ntp_server : %pI4\n", &net_ntp_server); 326 #endif 327 } 328 329 /* 330 * Handle a BOOTP received packet. 331 */ 332 static void bootp_handler(uchar *pkt, unsigned dest, struct in_addr sip, 333 unsigned src, unsigned len) 334 { 335 struct bootp_hdr *bp; 336 337 debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n", 338 src, dest, len, sizeof(struct bootp_hdr)); 339 340 bp = (struct bootp_hdr *)pkt; 341 342 /* Filter out pkts we don't want */ 343 if (check_reply_packet(pkt, dest, src, len)) 344 return; 345 346 /* 347 * Got a good BOOTP reply. Copy the data into our variables. 348 */ 349 #if defined(CONFIG_STATUS_LED) && defined(STATUS_LED_BOOT) 350 status_led_set(STATUS_LED_BOOT, STATUS_LED_OFF); 351 #endif 352 353 store_net_params(bp); /* Store net parameters from reply */ 354 355 /* Retrieve extended information (we must parse the vendor area) */ 356 if (net_read_u32((u32 *)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 357 bootp_process_vendor((uchar *)&bp->bp_vend[4], len); 358 359 net_set_timeout_handler(0, (thand_f *)0); 360 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop"); 361 362 debug("Got good BOOTP\n"); 363 364 net_auto_load(); 365 } 366 #endif 367 368 /* 369 * Timeout on BOOTP/DHCP request. 370 */ 371 static void bootp_timeout_handler(void) 372 { 373 ulong time_taken = get_timer(bootp_start); 374 375 if (time_taken >= TIMEOUT_MS) { 376 #ifdef CONFIG_BOOTP_MAY_FAIL 377 puts("\nRetry time exceeded\n"); 378 net_set_state(NETLOOP_FAIL); 379 #else 380 puts("\nRetry time exceeded; starting again\n"); 381 net_start_again(); 382 #endif 383 } else { 384 bootp_timeout *= 2; 385 if (bootp_timeout > 2000) 386 bootp_timeout = 2000; 387 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler); 388 bootp_request(); 389 } 390 } 391 392 #define put_vci(e, str) \ 393 do { \ 394 size_t vci_strlen = strlen(str); \ 395 *e++ = 60; /* Vendor Class Identifier */ \ 396 *e++ = vci_strlen; \ 397 memcpy(e, str, vci_strlen); \ 398 e += vci_strlen; \ 399 } while (0) 400 401 /* 402 * Initialize BOOTP extension fields in the request. 403 */ 404 #if defined(CONFIG_CMD_DHCP) 405 static int dhcp_extended(u8 *e, int message_type, struct in_addr server_ip, 406 struct in_addr requested_ip) 407 { 408 u8 *start = e; 409 u8 *cnt; 410 #if defined(CONFIG_BOOTP_PXE) 411 char *uuid; 412 u16 clientarch; 413 #endif 414 415 #if defined(CONFIG_BOOTP_VENDOREX) 416 u8 *x; 417 #endif 418 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 419 char *hostname; 420 #endif 421 422 *e++ = 99; /* RFC1048 Magic Cookie */ 423 *e++ = 130; 424 *e++ = 83; 425 *e++ = 99; 426 427 *e++ = 53; /* DHCP Message Type */ 428 *e++ = 1; 429 *e++ = message_type; 430 431 *e++ = 57; /* Maximum DHCP Message Size */ 432 *e++ = 2; 433 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 8; 434 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff; 435 436 if (server_ip.s_addr) { 437 int tmp = ntohl(server_ip.s_addr); 438 439 *e++ = 54; /* ServerID */ 440 *e++ = 4; 441 *e++ = tmp >> 24; 442 *e++ = tmp >> 16; 443 *e++ = tmp >> 8; 444 *e++ = tmp & 0xff; 445 } 446 447 if (requested_ip.s_addr) { 448 int tmp = ntohl(requested_ip.s_addr); 449 450 *e++ = 50; /* Requested IP */ 451 *e++ = 4; 452 *e++ = tmp >> 24; 453 *e++ = tmp >> 16; 454 *e++ = tmp >> 8; 455 *e++ = tmp & 0xff; 456 } 457 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 458 hostname = getenv("hostname"); 459 if (hostname) { 460 int hostnamelen = strlen(hostname); 461 462 *e++ = 12; /* Hostname */ 463 *e++ = hostnamelen; 464 memcpy(e, hostname, hostnamelen); 465 e += hostnamelen; 466 } 467 #endif 468 469 #if defined(CONFIG_BOOTP_PXE) 470 clientarch = CONFIG_BOOTP_PXE_CLIENTARCH; 471 *e++ = 93; /* Client System Architecture */ 472 *e++ = 2; 473 *e++ = (clientarch >> 8) & 0xff; 474 *e++ = clientarch & 0xff; 475 476 *e++ = 94; /* Client Network Interface Identifier */ 477 *e++ = 3; 478 *e++ = 1; /* type field for UNDI */ 479 *e++ = 0; /* major revision */ 480 *e++ = 0; /* minor revision */ 481 482 uuid = getenv("pxeuuid"); 483 484 if (uuid) { 485 if (uuid_str_valid(uuid)) { 486 *e++ = 97; /* Client Machine Identifier */ 487 *e++ = 17; 488 *e++ = 0; /* type 0 - UUID */ 489 490 uuid_str_to_bin(uuid, e, UUID_STR_FORMAT_STD); 491 e += 16; 492 } else { 493 printf("Invalid pxeuuid: %s\n", uuid); 494 } 495 } 496 #endif 497 498 #if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING) 499 put_vci(e, CONFIG_SPL_NET_VCI_STRING); 500 #elif defined(CONFIG_BOOTP_VCI_STRING) 501 put_vci(e, CONFIG_BOOTP_VCI_STRING); 502 #endif 503 504 #if defined(CONFIG_BOOTP_VENDOREX) 505 x = dhcp_vendorex_prep(e); 506 if (x) 507 return x - start; 508 #endif 509 510 *e++ = 55; /* Parameter Request List */ 511 cnt = e++; /* Pointer to count of requested items */ 512 *cnt = 0; 513 #if defined(CONFIG_BOOTP_SUBNETMASK) 514 *e++ = 1; /* Subnet Mask */ 515 *cnt += 1; 516 #endif 517 #if defined(CONFIG_BOOTP_TIMEOFFSET) 518 *e++ = 2; 519 *cnt += 1; 520 #endif 521 #if defined(CONFIG_BOOTP_GATEWAY) 522 *e++ = 3; /* Router Option */ 523 *cnt += 1; 524 #endif 525 #if defined(CONFIG_BOOTP_DNS) 526 *e++ = 6; /* DNS Server(s) */ 527 *cnt += 1; 528 #endif 529 #if defined(CONFIG_BOOTP_HOSTNAME) 530 *e++ = 12; /* Hostname */ 531 *cnt += 1; 532 #endif 533 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 534 *e++ = 13; /* Boot File Size */ 535 *cnt += 1; 536 #endif 537 #if defined(CONFIG_BOOTP_BOOTPATH) 538 *e++ = 17; /* Boot path */ 539 *cnt += 1; 540 #endif 541 #if defined(CONFIG_BOOTP_NISDOMAIN) 542 *e++ = 40; /* NIS Domain name request */ 543 *cnt += 1; 544 #endif 545 #if defined(CONFIG_BOOTP_NTPSERVER) 546 *e++ = 42; 547 *cnt += 1; 548 #endif 549 /* no options, so back up to avoid sending an empty request list */ 550 if (*cnt == 0) 551 e -= 2; 552 553 *e++ = 255; /* End of the list */ 554 555 /* Pad to minimal length */ 556 #ifdef CONFIG_DHCP_MIN_EXT_LEN 557 while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN) 558 *e++ = 0; 559 #endif 560 561 return e - start; 562 } 563 564 #else 565 /* 566 * Warning: no field size check - change CONFIG_BOOTP_* at your own risk! 567 */ 568 static int bootp_extended(u8 *e) 569 { 570 u8 *start = e; 571 572 *e++ = 99; /* RFC1048 Magic Cookie */ 573 *e++ = 130; 574 *e++ = 83; 575 *e++ = 99; 576 577 #if defined(CONFIG_CMD_DHCP) 578 *e++ = 53; /* DHCP Message Type */ 579 *e++ = 1; 580 *e++ = DHCP_DISCOVER; 581 582 *e++ = 57; /* Maximum DHCP Message Size */ 583 *e++ = 2; 584 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 16; 585 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff; 586 #endif 587 588 #if defined(CONFIG_BOOTP_VCI_STRING) || \ 589 (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING)) 590 #ifdef CONFIG_SPL_BUILD 591 put_vci(e, CONFIG_SPL_NET_VCI_STRING); 592 #else 593 put_vci(e, CONFIG_BOOTP_VCI_STRING); 594 #endif 595 #endif 596 597 #if defined(CONFIG_BOOTP_SUBNETMASK) 598 *e++ = 1; /* Subnet mask request */ 599 *e++ = 4; 600 e += 4; 601 #endif 602 603 #if defined(CONFIG_BOOTP_GATEWAY) 604 *e++ = 3; /* Default gateway request */ 605 *e++ = 4; 606 e += 4; 607 #endif 608 609 #if defined(CONFIG_BOOTP_DNS) 610 *e++ = 6; /* Domain Name Server */ 611 *e++ = 4; 612 e += 4; 613 #endif 614 615 #if defined(CONFIG_BOOTP_HOSTNAME) 616 *e++ = 12; /* Host name request */ 617 *e++ = 32; 618 e += 32; 619 #endif 620 621 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 622 *e++ = 13; /* Boot file size */ 623 *e++ = 2; 624 e += 2; 625 #endif 626 627 #if defined(CONFIG_BOOTP_BOOTPATH) 628 *e++ = 17; /* Boot path */ 629 *e++ = 32; 630 e += 32; 631 #endif 632 633 #if defined(CONFIG_BOOTP_NISDOMAIN) 634 *e++ = 40; /* NIS Domain name request */ 635 *e++ = 32; 636 e += 32; 637 #endif 638 #if defined(CONFIG_BOOTP_NTPSERVER) 639 *e++ = 42; 640 *e++ = 4; 641 e += 4; 642 #endif 643 644 *e++ = 255; /* End of the list */ 645 646 return e - start; 647 } 648 #endif 649 650 void bootp_reset(void) 651 { 652 bootp_num_ids = 0; 653 bootp_try = 0; 654 bootp_start = get_timer(0); 655 bootp_timeout = 250; 656 } 657 658 void bootp_request(void) 659 { 660 uchar *pkt, *iphdr; 661 struct bootp_hdr *bp; 662 int extlen, pktlen, iplen; 663 int eth_hdr_size; 664 #ifdef CONFIG_BOOTP_RANDOM_DELAY 665 ulong rand_ms; 666 #endif 667 u32 bootp_id; 668 struct in_addr zero_ip; 669 struct in_addr bcast_ip; 670 671 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start"); 672 #if defined(CONFIG_CMD_DHCP) 673 dhcp_state = INIT; 674 #endif 675 676 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */ 677 if (bootp_try == 0) 678 srand_mac(); 679 680 if (bootp_try <= 2) /* Start with max 1024 * 1ms */ 681 rand_ms = rand() >> (22 - bootp_try); 682 else /* After 3rd BOOTP request max 8192 * 1ms */ 683 rand_ms = rand() >> 19; 684 685 printf("Random delay: %ld ms...\n", rand_ms); 686 mdelay(rand_ms); 687 688 #endif /* CONFIG_BOOTP_RANDOM_DELAY */ 689 690 printf("BOOTP broadcast %d\n", ++bootp_try); 691 pkt = net_tx_packet; 692 memset((void *)pkt, 0, PKTSIZE); 693 694 eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP); 695 pkt += eth_hdr_size; 696 697 /* 698 * Next line results in incorrect packet size being transmitted, 699 * resulting in errors in some DHCP servers, reporting missing bytes. 700 * Size must be set in packet header after extension length has been 701 * determined. 702 * C. Hallinan, DS4.COM, Inc. 703 */ 704 /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, 705 sizeof (struct bootp_hdr)); */ 706 iphdr = pkt; /* We need this later for net_set_udp_header() */ 707 pkt += IP_UDP_HDR_SIZE; 708 709 bp = (struct bootp_hdr *)pkt; 710 bp->bp_op = OP_BOOTREQUEST; 711 bp->bp_htype = HWT_ETHER; 712 bp->bp_hlen = HWL_ETHER; 713 bp->bp_hops = 0; 714 /* 715 * according to RFC1542, should be 0 on first request, secs since 716 * first request otherwise 717 */ 718 bp->bp_secs = htons(get_timer(bootp_start) / 1000); 719 zero_ip.s_addr = 0; 720 net_write_ip(&bp->bp_ciaddr, zero_ip); 721 net_write_ip(&bp->bp_yiaddr, zero_ip); 722 net_write_ip(&bp->bp_siaddr, zero_ip); 723 net_write_ip(&bp->bp_giaddr, zero_ip); 724 memcpy(bp->bp_chaddr, net_ethaddr, 6); 725 copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file)); 726 727 /* Request additional information from the BOOTP/DHCP server */ 728 #if defined(CONFIG_CMD_DHCP) 729 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_DISCOVER, zero_ip, 730 zero_ip); 731 #else 732 extlen = bootp_extended((u8 *)bp->bp_vend); 733 #endif 734 735 /* 736 * Bootp ID is the lower 4 bytes of our ethernet address 737 * plus the current time in ms. 738 */ 739 bootp_id = ((u32)net_ethaddr[2] << 24) 740 | ((u32)net_ethaddr[3] << 16) 741 | ((u32)net_ethaddr[4] << 8) 742 | (u32)net_ethaddr[5]; 743 bootp_id += get_timer(0); 744 bootp_id = htonl(bootp_id); 745 bootp_add_id(bootp_id); 746 net_copy_u32(&bp->bp_id, &bootp_id); 747 748 /* 749 * Calculate proper packet lengths taking into account the 750 * variable size of the options field 751 */ 752 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen; 753 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen; 754 bcast_ip.s_addr = 0xFFFFFFFFL; 755 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen); 756 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler); 757 758 #if defined(CONFIG_CMD_DHCP) 759 dhcp_state = SELECTING; 760 net_set_udp_handler(dhcp_handler); 761 #else 762 net_set_udp_handler(bootp_handler); 763 #endif 764 net_send_packet(net_tx_packet, pktlen); 765 } 766 767 #if defined(CONFIG_CMD_DHCP) 768 static void dhcp_process_options(uchar *popt, struct bootp_hdr *bp) 769 { 770 uchar *end = popt + BOOTP_HDR_SIZE; 771 int oplen, size; 772 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 773 int *to_ptr; 774 #endif 775 776 while (popt < end && *popt != 0xff) { 777 oplen = *(popt + 1); 778 switch (*popt) { 779 case 0: 780 oplen = -1; /* Pad omits len byte */ 781 break; 782 case 1: 783 net_copy_ip(&net_netmask, (popt + 2)); 784 break; 785 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 786 case 2: /* Time offset */ 787 to_ptr = &net_ntp_time_offset; 788 net_copy_u32((u32 *)to_ptr, (u32 *)(popt + 2)); 789 net_ntp_time_offset = ntohl(net_ntp_time_offset); 790 break; 791 #endif 792 case 3: 793 net_copy_ip(&net_gateway, (popt + 2)); 794 break; 795 case 6: 796 net_copy_ip(&net_dns_server, (popt + 2)); 797 #if defined(CONFIG_BOOTP_DNS2) 798 if (*(popt + 1) > 4) 799 net_copy_ip(&net_dns_server2, (popt + 2 + 4)); 800 #endif 801 break; 802 case 12: 803 size = truncate_sz("Host Name", 804 sizeof(net_hostname), oplen); 805 memcpy(&net_hostname, popt + 2, size); 806 net_hostname[size] = 0; 807 break; 808 case 15: /* Ignore Domain Name Option */ 809 break; 810 case 17: 811 size = truncate_sz("Root Path", 812 sizeof(net_root_path), oplen); 813 memcpy(&net_root_path, popt + 2, size); 814 net_root_path[size] = 0; 815 break; 816 case 28: /* Ignore Broadcast Address Option */ 817 break; 818 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 819 case 42: /* NTP server IP */ 820 net_copy_ip(&net_ntp_server, (popt + 2)); 821 break; 822 #endif 823 case 51: 824 net_copy_u32(&dhcp_leasetime, (u32 *)(popt + 2)); 825 break; 826 case 53: /* Ignore Message Type Option */ 827 break; 828 case 54: 829 net_copy_ip(&dhcp_server_ip, (popt + 2)); 830 break; 831 case 58: /* Ignore Renewal Time Option */ 832 break; 833 case 59: /* Ignore Rebinding Time Option */ 834 break; 835 case 66: /* Ignore TFTP server name */ 836 break; 837 case 67: /* vendor opt bootfile */ 838 /* 839 * I can't use dhcp_vendorex_proc here because I need 840 * to write into the bootp packet - even then I had to 841 * pass the bootp packet pointer into here as the 842 * second arg 843 */ 844 size = truncate_sz("Opt Boot File", 845 sizeof(bp->bp_file), 846 oplen); 847 if (bp->bp_file[0] == '\0' && size > 0) { 848 /* 849 * only use vendor boot file if we didn't 850 * receive a boot file in the main non-vendor 851 * part of the packet - god only knows why 852 * some vendors chose not to use this perfectly 853 * good spot to store the boot file (join on 854 * Tru64 Unix) it seems mind bogglingly crazy 855 * to me 856 */ 857 printf("*** WARNING: using vendor " 858 "optional boot file\n"); 859 memcpy(bp->bp_file, popt + 2, size); 860 bp->bp_file[size] = '\0'; 861 } 862 break; 863 default: 864 #if defined(CONFIG_BOOTP_VENDOREX) 865 if (dhcp_vendorex_proc(popt)) 866 break; 867 #endif 868 printf("*** Unhandled DHCP Option in OFFER/ACK:" 869 " %d\n", *popt); 870 break; 871 } 872 popt += oplen + 2; /* Process next option */ 873 } 874 } 875 876 static int dhcp_message_type(unsigned char *popt) 877 { 878 if (net_read_u32((u32 *)popt) != htonl(BOOTP_VENDOR_MAGIC)) 879 return -1; 880 881 popt += 4; 882 while (*popt != 0xff) { 883 if (*popt == 53) /* DHCP Message Type */ 884 return *(popt + 2); 885 if (*popt == 0) { 886 /* Pad */ 887 popt += 1; 888 } else { 889 /* Scan through all options */ 890 popt += *(popt + 1) + 2; 891 } 892 } 893 return -1; 894 } 895 896 static void dhcp_send_request_packet(struct bootp_hdr *bp_offer) 897 { 898 uchar *pkt, *iphdr; 899 struct bootp_hdr *bp; 900 int pktlen, iplen, extlen; 901 int eth_hdr_size; 902 struct in_addr offered_ip; 903 struct in_addr zero_ip; 904 struct in_addr bcast_ip; 905 906 debug("dhcp_send_request_packet: Sending DHCPREQUEST\n"); 907 pkt = net_tx_packet; 908 memset((void *)pkt, 0, PKTSIZE); 909 910 eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP); 911 pkt += eth_hdr_size; 912 913 iphdr = pkt; /* We'll need this later to set proper pkt size */ 914 pkt += IP_UDP_HDR_SIZE; 915 916 bp = (struct bootp_hdr *)pkt; 917 bp->bp_op = OP_BOOTREQUEST; 918 bp->bp_htype = HWT_ETHER; 919 bp->bp_hlen = HWL_ETHER; 920 bp->bp_hops = 0; 921 bp->bp_secs = htons(get_timer(bootp_start) / 1000); 922 /* Do not set the client IP, your IP, or server IP yet, since it 923 * hasn't been ACK'ed by the server yet */ 924 925 /* 926 * RFC3046 requires Relay Agents to discard packets with 927 * nonzero and offered giaddr 928 */ 929 zero_ip.s_addr = 0; 930 net_write_ip(&bp->bp_giaddr, zero_ip); 931 932 memcpy(bp->bp_chaddr, net_ethaddr, 6); 933 934 /* 935 * ID is the id of the OFFER packet 936 */ 937 938 net_copy_u32(&bp->bp_id, &bp_offer->bp_id); 939 940 /* 941 * Copy options from OFFER packet if present 942 */ 943 944 /* Copy offered IP into the parameters request list */ 945 net_copy_ip(&offered_ip, &bp_offer->bp_yiaddr); 946 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST, 947 dhcp_server_ip, offered_ip); 948 949 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen; 950 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen; 951 bcast_ip.s_addr = 0xFFFFFFFFL; 952 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen); 953 954 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY 955 udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY); 956 #endif /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */ 957 debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen); 958 net_send_packet(net_tx_packet, pktlen); 959 } 960 961 /* 962 * Handle DHCP received packets. 963 */ 964 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip, 965 unsigned src, unsigned len) 966 { 967 struct bootp_hdr *bp = (struct bootp_hdr *)pkt; 968 969 debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n", 970 src, dest, len, dhcp_state); 971 972 /* Filter out pkts we don't want */ 973 if (check_reply_packet(pkt, dest, src, len)) 974 return; 975 976 debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: " 977 "%d\n", src, dest, len, dhcp_state); 978 979 switch (dhcp_state) { 980 case SELECTING: 981 /* 982 * Wait an appropriate time for any potential DHCPOFFER packets 983 * to arrive. Then select one, and generate DHCPREQUEST 984 * response. If filename is in format we recognize, assume it 985 * is a valid OFFER from a server we want. 986 */ 987 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file); 988 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 989 if (strncmp(bp->bp_file, 990 CONFIG_SYS_BOOTFILE_PREFIX, 991 strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) { 992 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 993 994 debug("TRANSITIONING TO REQUESTING STATE\n"); 995 dhcp_state = REQUESTING; 996 997 if (net_read_u32((u32 *)&bp->bp_vend[0]) == 998 htonl(BOOTP_VENDOR_MAGIC)) 999 dhcp_process_options((u8 *)&bp->bp_vend[4], bp); 1000 1001 net_set_timeout_handler(5000, bootp_timeout_handler); 1002 dhcp_send_request_packet(bp); 1003 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 1004 } 1005 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 1006 1007 return; 1008 break; 1009 case REQUESTING: 1010 debug("DHCP State: REQUESTING\n"); 1011 1012 if (dhcp_message_type((u8 *)bp->bp_vend) == DHCP_ACK) { 1013 if (net_read_u32((u32 *)&bp->bp_vend[0]) == 1014 htonl(BOOTP_VENDOR_MAGIC)) 1015 dhcp_process_options((u8 *)&bp->bp_vend[4], bp); 1016 /* Store net params from reply */ 1017 store_net_params(bp); 1018 dhcp_state = BOUND; 1019 printf("DHCP client bound to address %pI4 (%lu ms)\n", 1020 &net_ip, get_timer(bootp_start)); 1021 net_set_timeout_handler(0, (thand_f *)0); 1022 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, 1023 "bootp_stop"); 1024 1025 net_auto_load(); 1026 return; 1027 } 1028 break; 1029 case BOUND: 1030 /* DHCP client bound to address */ 1031 break; 1032 default: 1033 puts("DHCP: INVALID STATE\n"); 1034 break; 1035 } 1036 } 1037 1038 void dhcp_request(void) 1039 { 1040 bootp_request(); 1041 } 1042 #endif /* CONFIG_CMD_DHCP */ 1043