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