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