1 /* 2 * Based on LiMon - BOOTP. 3 * 4 * Copyright 1994, 1995, 2000 Neil Russell. 5 * (See License) 6 * Copyright 2000 Roland Borde 7 * Copyright 2000 Paolo Scaffardi 8 * Copyright 2000-2004 Wolfgang Denk, wd@denx.de 9 */ 10 11 #include <common.h> 12 #include <command.h> 13 #include <net.h> 14 #include "bootp.h" 15 #include "tftp.h" 16 #include "nfs.h" 17 #ifdef CONFIG_STATUS_LED 18 #include <status_led.h> 19 #endif 20 #ifdef CONFIG_BOOTP_RANDOM_DELAY 21 #include "net_rand.h" 22 #endif 23 24 #define BOOTP_VENDOR_MAGIC 0x63825363 /* RFC1048 Magic Cookie */ 25 26 /* 27 * The timeout for the initial BOOTP/DHCP request used to be described by a 28 * counter of fixed-length timeout periods. TIMEOUT_COUNT represents 29 * that counter 30 * 31 * Now that the timeout periods are variable (exponential backoff and retry) 32 * we convert the timeout count to the absolute time it would have take to 33 * execute that many retries, and keep sending retry packets until that time 34 * is reached. 35 */ 36 #ifndef CONFIG_NET_RETRY_COUNT 37 # define TIMEOUT_COUNT 5 /* # of timeouts before giving up */ 38 #else 39 # define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT) 40 #endif 41 #define TIMEOUT_MS ((3 + (TIMEOUT_COUNT * 5)) * 1000) 42 43 #define PORT_BOOTPS 67 /* BOOTP server UDP port */ 44 #define PORT_BOOTPC 68 /* BOOTP client UDP port */ 45 46 #ifndef CONFIG_DHCP_MIN_EXT_LEN /* minimal length of extension list */ 47 #define CONFIG_DHCP_MIN_EXT_LEN 64 48 #endif 49 50 #ifndef CONFIG_BOOTP_ID_CACHE_SIZE 51 #define CONFIG_BOOTP_ID_CACHE_SIZE 4 52 #endif 53 54 ulong bootp_ids[CONFIG_BOOTP_ID_CACHE_SIZE]; 55 unsigned int bootp_num_ids; 56 int 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 unsigned long dhcp_leasetime; 66 static struct in_addr dhcp_server_ip; 67 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip, 68 unsigned src, unsigned len); 69 70 /* For Debug */ 71 #if 0 72 static char *dhcpmsg2str(int type) 73 { 74 switch (type) { 75 case 1: return "DHCPDISCOVER"; break; 76 case 2: return "DHCPOFFER"; break; 77 case 3: return "DHCPREQUEST"; break; 78 case 4: return "DHCPDECLINE"; break; 79 case 5: return "DHCPACK"; break; 80 case 6: return "DHCPNACK"; break; 81 case 7: return "DHCPRELEASE"; break; 82 default: return "UNKNOWN/INVALID MSG TYPE"; break; 83 } 84 } 85 #endif 86 #endif 87 88 static void bootp_add_id(ulong id) 89 { 90 if (bootp_num_ids >= ARRAY_SIZE(bootp_ids)) { 91 size_t size = sizeof(bootp_ids) - sizeof(id); 92 93 memmove(bootp_ids, &bootp_ids[1], size); 94 bootp_ids[bootp_num_ids - 1] = id; 95 } else { 96 bootp_ids[bootp_num_ids] = id; 97 bootp_num_ids++; 98 } 99 } 100 101 static bool bootp_match_id(ulong id) 102 { 103 unsigned int i; 104 105 for (i = 0; i < bootp_num_ids; i++) 106 if (bootp_ids[i] == id) 107 return true; 108 109 return false; 110 } 111 112 static int check_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len) 113 { 114 struct bootp_hdr *bp = (struct bootp_hdr *)pkt; 115 int retval = 0; 116 117 if (dest != PORT_BOOTPC || src != PORT_BOOTPS) 118 retval = -1; 119 else if (len < sizeof(struct bootp_hdr) - OPT_FIELD_SIZE) 120 retval = -2; 121 else if (bp->bp_op != OP_BOOTREQUEST && 122 bp->bp_op != OP_BOOTREPLY && 123 bp->bp_op != DHCP_OFFER && 124 bp->bp_op != DHCP_ACK && 125 bp->bp_op != DHCP_NAK) 126 retval = -3; 127 else if (bp->bp_htype != HWT_ETHER) 128 retval = -4; 129 else if (bp->bp_hlen != HWL_ETHER) 130 retval = -5; 131 else if (!bootp_match_id(net_read_long((ulong *)&bp->bp_id))) 132 retval = -6; 133 134 debug("Filtering pkt = %d\n", retval); 135 136 return retval; 137 } 138 139 /* 140 * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet 141 */ 142 static void 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 (strlen(bp->bp_file) > 0) 153 copy_filename(net_boot_file_name, bp->bp_file, 154 sizeof(net_boot_file_name)); 155 156 debug("net_boot_file_name: %s\n", net_boot_file_name); 157 158 /* Propagate to environment: 159 * don't delete exising entry when BOOTP / DHCP reply does 160 * not contain a new value 161 */ 162 if (*net_boot_file_name) 163 setenv("bootfile", net_boot_file_name); 164 #endif 165 net_copy_ip(&net_ip, &bp->bp_yiaddr); 166 } 167 168 static int truncate_sz(const char *name, int maxlen, int curlen) 169 { 170 if (curlen >= maxlen) { 171 printf("*** WARNING: %s is too long (%d - max: %d)" 172 " - truncated\n", name, curlen, maxlen); 173 curlen = maxlen - 1; 174 } 175 return curlen; 176 } 177 178 #if !defined(CONFIG_CMD_DHCP) 179 180 static void bootp_process_vendor_field(u8 *ext) 181 { 182 int size = *(ext + 1); 183 184 debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext, 185 *(ext + 1)); 186 187 net_boot_file_expected_size_in_blocks = 0; 188 189 switch (*ext) { 190 /* Fixed length fields */ 191 case 1: /* Subnet mask */ 192 if (net_netmask.s_addr == 0) 193 net_copy_ip(&net_netmask, (struct in_addr *)(ext + 2)); 194 break; 195 case 2: /* Time offset - Not yet supported */ 196 break; 197 /* Variable length fields */ 198 case 3: /* Gateways list */ 199 if (net_gateway.s_addr == 0) 200 net_copy_ip(&net_gateway, (struct in_addr *)(ext + 2)); 201 break; 202 case 4: /* Time server - Not yet supported */ 203 break; 204 case 5: /* IEN-116 name server - Not yet supported */ 205 break; 206 case 6: 207 if (net_dns_server.s_addr == 0) 208 net_copy_ip(&net_dns_server, 209 (struct in_addr *)(ext + 2)); 210 #if defined(CONFIG_BOOTP_DNS2) 211 if ((net_dns_server2.s_addr == 0) && (size > 4)) 212 net_copy_ip(&net_dns_server2, 213 (struct in_addr *)(ext + 2 + 4)); 214 #endif 215 break; 216 case 7: /* Log server - Not yet supported */ 217 break; 218 case 8: /* Cookie/Quote server - Not yet supported */ 219 break; 220 case 9: /* LPR server - Not yet supported */ 221 break; 222 case 10: /* Impress server - Not yet supported */ 223 break; 224 case 11: /* RPL server - Not yet supported */ 225 break; 226 case 12: /* Host name */ 227 if (net_hostname[0] == 0) { 228 size = truncate_sz("Host Name", 229 sizeof(net_hostname), size); 230 memcpy(&net_hostname, ext + 2, size); 231 net_hostname[size] = 0; 232 } 233 break; 234 case 13: /* Boot file size */ 235 if (size == 2) 236 net_boot_file_expected_size_in_blocks = 237 ntohs(*(ushort *)(ext + 2)); 238 else if (size == 4) 239 net_boot_file_expected_size_in_blocks = 240 ntohl(*(ulong *)(ext + 2)); 241 break; 242 case 14: /* Merit dump file - Not yet supported */ 243 break; 244 case 15: /* Domain name - Not yet supported */ 245 break; 246 case 16: /* Swap server - Not yet supported */ 247 break; 248 case 17: /* Root path */ 249 if (net_root_path[0] == 0) { 250 size = truncate_sz("Root Path", 251 sizeof(net_root_path), size); 252 memcpy(&net_root_path, ext + 2, size); 253 net_root_path[size] = 0; 254 } 255 break; 256 case 18: /* Extension path - Not yet supported */ 257 /* 258 * This can be used to send the information of the 259 * vendor area in another file that the client can 260 * access via TFTP. 261 */ 262 break; 263 /* IP host layer fields */ 264 case 40: /* NIS Domain name */ 265 if (net_nis_domain[0] == 0) { 266 size = truncate_sz("NIS Domain Name", 267 sizeof(net_nis_domain), size); 268 memcpy(&net_nis_domain, ext + 2, size); 269 net_nis_domain[size] = 0; 270 } 271 break; 272 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 273 case 42: /* NTP server IP */ 274 net_copy_ip(&net_ntp_server, (struct in_addr *)(ext + 2)); 275 break; 276 #endif 277 /* Application layer fields */ 278 case 43: /* Vendor specific info - Not yet supported */ 279 /* 280 * Binary information to exchange specific 281 * product information. 282 */ 283 break; 284 /* Reserved (custom) fields (128..254) */ 285 } 286 } 287 288 static void bootp_process_vendor(u8 *ext, int size) 289 { 290 u8 *end = ext + size; 291 292 debug("[BOOTP] Checking extension (%d bytes)...\n", size); 293 294 while ((ext < end) && (*ext != 0xff)) { 295 if (*ext == 0) { 296 ext++; 297 } else { 298 u8 *opt = ext; 299 300 ext += ext[1] + 2; 301 if (ext <= end) 302 bootp_process_vendor_field(opt); 303 } 304 } 305 306 debug("[BOOTP] Received fields:\n"); 307 if (net_netmask.s_addr) 308 debug("net_netmask : %pI4\n", &net_netmask); 309 310 if (net_gateway.s_addr) 311 debug("net_gateway : %pI4", &net_gateway); 312 313 if (net_boot_file_expected_size_in_blocks) 314 debug("net_boot_file_expected_size_in_blocks : %d\n", 315 net_boot_file_expected_size_in_blocks); 316 317 if (net_hostname[0]) 318 debug("net_hostname : %s\n", net_hostname); 319 320 if (net_root_path[0]) 321 debug("net_root_path : %s\n", net_root_path); 322 323 if (net_nis_domain[0]) 324 debug("net_nis_domain : %s\n", net_nis_domain); 325 326 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 327 if (net_ntp_server) 328 debug("net_ntp_server : %pI4\n", &net_ntp_server); 329 #endif 330 } 331 332 /* 333 * Handle a BOOTP received packet. 334 */ 335 static void bootp_handler(uchar *pkt, unsigned dest, struct in_addr sip, 336 unsigned src, unsigned len) 337 { 338 struct bootp_hdr *bp; 339 340 debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n", 341 src, dest, len, sizeof(struct bootp_hdr)); 342 343 bp = (struct bootp_hdr *)pkt; 344 345 /* Filter out pkts we don't want */ 346 if (check_packet(pkt, dest, src, len)) 347 return; 348 349 /* 350 * Got a good BOOTP reply. Copy the data into our variables. 351 */ 352 #ifdef CONFIG_STATUS_LED 353 status_led_set(STATUS_LED_BOOT, STATUS_LED_OFF); 354 #endif 355 356 store_net_params(bp); /* Store net parameters from reply */ 357 358 /* Retrieve extended information (we must parse the vendor area) */ 359 if (net_read_long((ulong *)&bp->bp_vend[0]) == 360 htonl(BOOTP_VENDOR_MAGIC)) 361 bootp_process_vendor((uchar *)&bp->bp_vend[4], len); 362 363 net_set_timeout_handler(0, (thand_f *)0); 364 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop"); 365 366 debug("Got good BOOTP\n"); 367 368 net_auto_load(); 369 } 370 #endif 371 372 /* 373 * Timeout on BOOTP/DHCP request. 374 */ 375 static void bootp_timeout_handler(void) 376 { 377 ulong time_taken = get_timer(bootp_start); 378 379 if (time_taken >= TIMEOUT_MS) { 380 #ifdef CONFIG_BOOTP_MAY_FAIL 381 puts("\nRetry time exceeded\n"); 382 net_set_state(NETLOOP_FAIL); 383 #else 384 puts("\nRetry time exceeded; starting again\n"); 385 net_start_again(); 386 #endif 387 } else { 388 bootp_timeout *= 2; 389 if (bootp_timeout > 2000) 390 bootp_timeout = 2000; 391 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler); 392 bootp_request(); 393 } 394 } 395 396 #define put_vci(e, str) \ 397 do { \ 398 size_t vci_strlen = strlen(str); \ 399 *e++ = 60; /* Vendor Class Identifier */ \ 400 *e++ = vci_strlen; \ 401 memcpy(e, str, vci_strlen); \ 402 e += vci_strlen; \ 403 } while (0) 404 405 /* 406 * Initialize BOOTP extension fields in the request. 407 */ 408 #if defined(CONFIG_CMD_DHCP) 409 static int dhcp_extended(u8 *e, int message_type, struct in_addr server_ip, 410 struct in_addr requested_ip) 411 { 412 u8 *start = e; 413 u8 *cnt; 414 #if defined(CONFIG_BOOTP_PXE) 415 char *uuid; 416 u16 clientarch; 417 #endif 418 419 #if defined(CONFIG_BOOTP_VENDOREX) 420 u8 *x; 421 #endif 422 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 423 char *hostname; 424 #endif 425 426 *e++ = 99; /* RFC1048 Magic Cookie */ 427 *e++ = 130; 428 *e++ = 83; 429 *e++ = 99; 430 431 *e++ = 53; /* DHCP Message Type */ 432 *e++ = 1; 433 *e++ = message_type; 434 435 *e++ = 57; /* Maximum DHCP Message Size */ 436 *e++ = 2; 437 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 8; 438 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff; 439 440 if (server_ip.s_addr) { 441 int tmp = ntohl(server_ip.s_addr); 442 443 *e++ = 54; /* ServerID */ 444 *e++ = 4; 445 *e++ = tmp >> 24; 446 *e++ = tmp >> 16; 447 *e++ = tmp >> 8; 448 *e++ = tmp & 0xff; 449 } 450 451 if (requested_ip.s_addr) { 452 int tmp = ntohl(requested_ip.s_addr); 453 454 *e++ = 50; /* Requested IP */ 455 *e++ = 4; 456 *e++ = tmp >> 24; 457 *e++ = tmp >> 16; 458 *e++ = tmp >> 8; 459 *e++ = tmp & 0xff; 460 } 461 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 462 hostname = getenv("hostname"); 463 if (hostname) { 464 int hostnamelen = strlen(hostname); 465 466 *e++ = 12; /* Hostname */ 467 *e++ = hostnamelen; 468 memcpy(e, hostname, hostnamelen); 469 e += hostnamelen; 470 } 471 #endif 472 473 #if defined(CONFIG_BOOTP_PXE) 474 clientarch = CONFIG_BOOTP_PXE_CLIENTARCH; 475 *e++ = 93; /* Client System Architecture */ 476 *e++ = 2; 477 *e++ = (clientarch >> 8) & 0xff; 478 *e++ = clientarch & 0xff; 479 480 *e++ = 94; /* Client Network Interface Identifier */ 481 *e++ = 3; 482 *e++ = 1; /* type field for UNDI */ 483 *e++ = 0; /* major revision */ 484 *e++ = 0; /* minor revision */ 485 486 uuid = getenv("pxeuuid"); 487 488 if (uuid) { 489 if (uuid_str_valid(uuid)) { 490 *e++ = 97; /* Client Machine Identifier */ 491 *e++ = 17; 492 *e++ = 0; /* type 0 - UUID */ 493 494 uuid_str_to_bin(uuid, e, UUID_STR_FORMAT_STD); 495 e += 16; 496 } else { 497 printf("Invalid pxeuuid: %s\n", uuid); 498 } 499 } 500 #endif 501 502 #ifdef CONFIG_BOOTP_VCI_STRING 503 put_vci(e, CONFIG_BOOTP_VCI_STRING); 504 #endif 505 506 #if defined(CONFIG_BOOTP_VENDOREX) 507 x = dhcp_vendorex_prep(e); 508 if (x) 509 return x - start; 510 #endif 511 512 *e++ = 55; /* Parameter Request List */ 513 cnt = e++; /* Pointer to count of requested items */ 514 *cnt = 0; 515 #if defined(CONFIG_BOOTP_SUBNETMASK) 516 *e++ = 1; /* Subnet Mask */ 517 *cnt += 1; 518 #endif 519 #if defined(CONFIG_BOOTP_TIMEOFFSET) 520 *e++ = 2; 521 *cnt += 1; 522 #endif 523 #if defined(CONFIG_BOOTP_GATEWAY) 524 *e++ = 3; /* Router Option */ 525 *cnt += 1; 526 #endif 527 #if defined(CONFIG_BOOTP_DNS) 528 *e++ = 6; /* DNS Server(s) */ 529 *cnt += 1; 530 #endif 531 #if defined(CONFIG_BOOTP_HOSTNAME) 532 *e++ = 12; /* Hostname */ 533 *cnt += 1; 534 #endif 535 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 536 *e++ = 13; /* Boot File Size */ 537 *cnt += 1; 538 #endif 539 #if defined(CONFIG_BOOTP_BOOTPATH) 540 *e++ = 17; /* Boot path */ 541 *cnt += 1; 542 #endif 543 #if defined(CONFIG_BOOTP_NISDOMAIN) 544 *e++ = 40; /* NIS Domain name request */ 545 *cnt += 1; 546 #endif 547 #if defined(CONFIG_BOOTP_NTPSERVER) 548 *e++ = 42; 549 *cnt += 1; 550 #endif 551 /* no options, so back up to avoid sending an empty request list */ 552 if (*cnt == 0) 553 e -= 2; 554 555 *e++ = 255; /* End of the list */ 556 557 /* Pad to minimal length */ 558 #ifdef CONFIG_DHCP_MIN_EXT_LEN 559 while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN) 560 *e++ = 0; 561 #endif 562 563 return e - start; 564 } 565 566 #else 567 /* 568 * Warning: no field size check - change CONFIG_BOOTP_* at your own risk! 569 */ 570 static int bootp_extended(u8 *e) 571 { 572 u8 *start = e; 573 574 *e++ = 99; /* RFC1048 Magic Cookie */ 575 *e++ = 130; 576 *e++ = 83; 577 *e++ = 99; 578 579 #if defined(CONFIG_CMD_DHCP) 580 *e++ = 53; /* DHCP Message Type */ 581 *e++ = 1; 582 *e++ = DHCP_DISCOVER; 583 584 *e++ = 57; /* Maximum DHCP Message Size */ 585 *e++ = 2; 586 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 16; 587 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff; 588 #endif 589 590 #if defined(CONFIG_BOOTP_VCI_STRING) || \ 591 (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING)) 592 #ifdef CONFIG_SPL_BUILD 593 put_vci(e, CONFIG_SPL_NET_VCI_STRING); 594 #else 595 put_vci(e, CONFIG_BOOTP_VCI_STRING); 596 #endif 597 #endif 598 599 #if defined(CONFIG_BOOTP_SUBNETMASK) 600 *e++ = 1; /* Subnet mask request */ 601 *e++ = 4; 602 e += 4; 603 #endif 604 605 #if defined(CONFIG_BOOTP_GATEWAY) 606 *e++ = 3; /* Default gateway request */ 607 *e++ = 4; 608 e += 4; 609 #endif 610 611 #if defined(CONFIG_BOOTP_DNS) 612 *e++ = 6; /* Domain Name Server */ 613 *e++ = 4; 614 e += 4; 615 #endif 616 617 #if defined(CONFIG_BOOTP_HOSTNAME) 618 *e++ = 12; /* Host name request */ 619 *e++ = 32; 620 e += 32; 621 #endif 622 623 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 624 *e++ = 13; /* Boot file size */ 625 *e++ = 2; 626 e += 2; 627 #endif 628 629 #if defined(CONFIG_BOOTP_BOOTPATH) 630 *e++ = 17; /* Boot path */ 631 *e++ = 32; 632 e += 32; 633 #endif 634 635 #if defined(CONFIG_BOOTP_NISDOMAIN) 636 *e++ = 40; /* NIS Domain name request */ 637 *e++ = 32; 638 e += 32; 639 #endif 640 #if defined(CONFIG_BOOTP_NTPSERVER) 641 *e++ = 42; 642 *e++ = 4; 643 e += 4; 644 #endif 645 646 *e++ = 255; /* End of the list */ 647 648 return e - start; 649 } 650 #endif 651 652 void bootp_reset(void) 653 { 654 bootp_num_ids = 0; 655 bootp_try = 0; 656 bootp_start = get_timer(0); 657 bootp_timeout = 250; 658 } 659 660 void bootp_request(void) 661 { 662 uchar *pkt, *iphdr; 663 struct bootp_hdr *bp; 664 int extlen, pktlen, iplen; 665 int eth_hdr_size; 666 #ifdef CONFIG_BOOTP_RANDOM_DELAY 667 ulong rand_ms; 668 #endif 669 ulong bootp_id; 670 struct in_addr zero_ip; 671 struct in_addr bcast_ip; 672 673 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start"); 674 #if defined(CONFIG_CMD_DHCP) 675 dhcp_state = INIT; 676 #endif 677 678 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */ 679 if (bootp_try == 0) 680 srand_mac(); 681 682 if (bootp_try <= 2) /* Start with max 1024 * 1ms */ 683 rand_ms = rand() >> (22 - bootp_try); 684 else /* After 3rd BOOTP request max 8192 * 1ms */ 685 rand_ms = rand() >> 19; 686 687 printf("Random delay: %ld ms...\n", rand_ms); 688 mdelay(rand_ms); 689 690 #endif /* CONFIG_BOOTP_RANDOM_DELAY */ 691 692 printf("BOOTP broadcast %d\n", ++bootp_try); 693 pkt = net_tx_packet; 694 memset((void *)pkt, 0, PKTSIZE); 695 696 eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP); 697 pkt += eth_hdr_size; 698 699 /* 700 * Next line results in incorrect packet size being transmitted, 701 * resulting in errors in some DHCP servers, reporting missing bytes. 702 * Size must be set in packet header after extension length has been 703 * determined. 704 * C. Hallinan, DS4.COM, Inc. 705 */ 706 /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, 707 sizeof (struct bootp_hdr)); */ 708 iphdr = pkt; /* We need this later for net_set_udp_header() */ 709 pkt += IP_UDP_HDR_SIZE; 710 711 bp = (struct bootp_hdr *)pkt; 712 bp->bp_op = OP_BOOTREQUEST; 713 bp->bp_htype = HWT_ETHER; 714 bp->bp_hlen = HWL_ETHER; 715 bp->bp_hops = 0; 716 bp->bp_secs = htons(get_timer(0) / 1000); 717 zero_ip.s_addr = 0; 718 net_write_ip(&bp->bp_ciaddr, zero_ip); 719 net_write_ip(&bp->bp_yiaddr, zero_ip); 720 net_write_ip(&bp->bp_siaddr, zero_ip); 721 net_write_ip(&bp->bp_giaddr, zero_ip); 722 memcpy(bp->bp_chaddr, net_ethaddr, 6); 723 copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file)); 724 725 /* Request additional information from the BOOTP/DHCP server */ 726 #if defined(CONFIG_CMD_DHCP) 727 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_DISCOVER, zero_ip, 728 zero_ip); 729 #else 730 extlen = bootp_extended((u8 *)bp->bp_vend); 731 #endif 732 733 /* 734 * Bootp ID is the lower 4 bytes of our ethernet address 735 * plus the current time in ms. 736 */ 737 bootp_id = ((ulong)net_ethaddr[2] << 24) 738 | ((ulong)net_ethaddr[3] << 16) 739 | ((ulong)net_ethaddr[4] << 8) 740 | (ulong)net_ethaddr[5]; 741 bootp_id += get_timer(0); 742 bootp_id = htonl(bootp_id); 743 bootp_add_id(bootp_id); 744 net_copy_long(&bp->bp_id, &bootp_id); 745 746 /* 747 * Calculate proper packet lengths taking into account the 748 * variable size of the options field 749 */ 750 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen; 751 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen; 752 bcast_ip.s_addr = 0xFFFFFFFFL; 753 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen); 754 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler); 755 756 #if defined(CONFIG_CMD_DHCP) 757 dhcp_state = SELECTING; 758 net_set_udp_handler(dhcp_handler); 759 #else 760 net_set_udp_handler(bootp_handler); 761 #endif 762 net_send_packet(net_tx_packet, pktlen); 763 } 764 765 #if defined(CONFIG_CMD_DHCP) 766 static void dhcp_process_options(uchar *popt, struct bootp_hdr *bp) 767 { 768 uchar *end = popt + BOOTP_HDR_SIZE; 769 int oplen, size; 770 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 771 int *to_ptr; 772 #endif 773 774 while (popt < end && *popt != 0xff) { 775 oplen = *(popt + 1); 776 switch (*popt) { 777 case 1: 778 net_copy_ip(&net_netmask, (popt + 2)); 779 break; 780 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 781 case 2: /* Time offset */ 782 to_ptr = &net_ntp_time_offset; 783 net_copy_long((ulong *)to_ptr, (ulong *)(popt + 2)); 784 net_ntp_time_offset = ntohl(net_ntp_time_offset); 785 break; 786 #endif 787 case 3: 788 net_copy_ip(&net_gateway, (popt + 2)); 789 break; 790 case 6: 791 net_copy_ip(&net_dns_server, (popt + 2)); 792 #if defined(CONFIG_BOOTP_DNS2) 793 if (*(popt + 1) > 4) 794 net_copy_ip(&net_dns_server2, (popt + 2 + 4)); 795 #endif 796 break; 797 case 12: 798 size = truncate_sz("Host Name", 799 sizeof(net_hostname), oplen); 800 memcpy(&net_hostname, popt + 2, size); 801 net_hostname[size] = 0; 802 break; 803 case 15: /* Ignore Domain Name Option */ 804 break; 805 case 17: 806 size = truncate_sz("Root Path", 807 sizeof(net_root_path), oplen); 808 memcpy(&net_root_path, popt + 2, size); 809 net_root_path[size] = 0; 810 break; 811 case 28: /* Ignore Broadcast Address Option */ 812 break; 813 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 814 case 42: /* NTP server IP */ 815 net_copy_ip(&net_ntp_server, (popt + 2)); 816 break; 817 #endif 818 case 51: 819 net_copy_long(&dhcp_leasetime, (ulong *)(popt + 2)); 820 break; 821 case 53: /* Ignore Message Type Option */ 822 break; 823 case 54: 824 net_copy_ip(&dhcp_server_ip, (popt + 2)); 825 break; 826 case 58: /* Ignore Renewal Time Option */ 827 break; 828 case 59: /* Ignore Rebinding Time Option */ 829 break; 830 case 66: /* Ignore TFTP server name */ 831 break; 832 case 67: /* vendor opt bootfile */ 833 /* 834 * I can't use dhcp_vendorex_proc here because I need 835 * to write into the bootp packet - even then I had to 836 * pass the bootp packet pointer into here as the 837 * second arg 838 */ 839 size = truncate_sz("Opt Boot File", 840 sizeof(bp->bp_file), 841 oplen); 842 if (bp->bp_file[0] == '\0' && size > 0) { 843 /* 844 * only use vendor boot file if we didn't 845 * receive a boot file in the main non-vendor 846 * part of the packet - god only knows why 847 * some vendors chose not to use this perfectly 848 * good spot to store the boot file (join on 849 * Tru64 Unix) it seems mind bogglingly crazy 850 * to me 851 */ 852 printf("*** WARNING: using vendor " 853 "optional boot file\n"); 854 memcpy(bp->bp_file, popt + 2, size); 855 bp->bp_file[size] = '\0'; 856 } 857 break; 858 default: 859 #if defined(CONFIG_BOOTP_VENDOREX) 860 if (dhcp_vendorex_proc(popt)) 861 break; 862 #endif 863 printf("*** Unhandled DHCP Option in OFFER/ACK:" 864 " %d\n", *popt); 865 break; 866 } 867 popt += oplen + 2; /* Process next option */ 868 } 869 } 870 871 static int dhcp_message_type(unsigned char *popt) 872 { 873 if (net_read_long((ulong *)popt) != htonl(BOOTP_VENDOR_MAGIC)) 874 return -1; 875 876 popt += 4; 877 while (*popt != 0xff) { 878 if (*popt == 53) /* DHCP Message Type */ 879 return *(popt + 2); 880 popt += *(popt + 1) + 2; /* Scan through all options */ 881 } 882 return -1; 883 } 884 885 static void dhcp_send_request_packet(struct bootp_hdr *bp_offer) 886 { 887 uchar *pkt, *iphdr; 888 struct bootp_hdr *bp; 889 int pktlen, iplen, extlen; 890 int eth_hdr_size; 891 struct in_addr offered_ip; 892 struct in_addr zero_ip; 893 struct in_addr bcast_ip; 894 895 debug("dhcp_send_request_packet: Sending DHCPREQUEST\n"); 896 pkt = net_tx_packet; 897 memset((void *)pkt, 0, PKTSIZE); 898 899 eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP); 900 pkt += eth_hdr_size; 901 902 iphdr = pkt; /* We'll need this later to set proper pkt size */ 903 pkt += IP_UDP_HDR_SIZE; 904 905 bp = (struct bootp_hdr *)pkt; 906 bp->bp_op = OP_BOOTREQUEST; 907 bp->bp_htype = HWT_ETHER; 908 bp->bp_hlen = HWL_ETHER; 909 bp->bp_hops = 0; 910 bp->bp_secs = htons(get_timer(0) / 1000); 911 /* Do not set the client IP, your IP, or server IP yet, since it 912 * hasn't been ACK'ed by the server yet */ 913 914 /* 915 * RFC3046 requires Relay Agents to discard packets with 916 * nonzero and offered giaddr 917 */ 918 zero_ip.s_addr = 0; 919 net_write_ip(&bp->bp_giaddr, zero_ip); 920 921 memcpy(bp->bp_chaddr, net_ethaddr, 6); 922 923 /* 924 * ID is the id of the OFFER packet 925 */ 926 927 net_copy_long(&bp->bp_id, &bp_offer->bp_id); 928 929 /* 930 * Copy options from OFFER packet if present 931 */ 932 933 /* Copy offered IP into the parameters request list */ 934 net_copy_ip(&offered_ip, &bp_offer->bp_yiaddr); 935 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST, 936 dhcp_server_ip, offered_ip); 937 938 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen; 939 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen; 940 bcast_ip.s_addr = 0xFFFFFFFFL; 941 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen); 942 943 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY 944 udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY); 945 #endif /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */ 946 debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen); 947 net_send_packet(net_tx_packet, pktlen); 948 } 949 950 /* 951 * Handle DHCP received packets. 952 */ 953 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip, 954 unsigned src, unsigned len) 955 { 956 struct bootp_hdr *bp = (struct bootp_hdr *)pkt; 957 958 debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n", 959 src, dest, len, dhcp_state); 960 961 /* Filter out pkts we don't want */ 962 if (check_packet(pkt, dest, src, len)) 963 return; 964 965 debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: " 966 "%d\n", src, dest, len, dhcp_state); 967 968 switch (dhcp_state) { 969 case SELECTING: 970 /* 971 * Wait an appropriate time for any potential DHCPOFFER packets 972 * to arrive. Then select one, and generate DHCPREQUEST 973 * response. If filename is in format we recognize, assume it 974 * is a valid OFFER from a server we want. 975 */ 976 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file); 977 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 978 if (strncmp(bp->bp_file, 979 CONFIG_SYS_BOOTFILE_PREFIX, 980 strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) { 981 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 982 983 debug("TRANSITIONING TO REQUESTING STATE\n"); 984 dhcp_state = REQUESTING; 985 986 if (net_read_long((ulong *)&bp->bp_vend[0]) == 987 htonl(BOOTP_VENDOR_MAGIC)) 988 dhcp_process_options((u8 *)&bp->bp_vend[4], bp); 989 990 net_set_timeout_handler(5000, bootp_timeout_handler); 991 dhcp_send_request_packet(bp); 992 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 993 } 994 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 995 996 return; 997 break; 998 case REQUESTING: 999 debug("DHCP State: REQUESTING\n"); 1000 1001 if (dhcp_message_type((u8 *)bp->bp_vend) == DHCP_ACK) { 1002 if (net_read_long((ulong *)&bp->bp_vend[0]) == 1003 htonl(BOOTP_VENDOR_MAGIC)) 1004 dhcp_process_options((u8 *)&bp->bp_vend[4], bp); 1005 /* Store net params from reply */ 1006 store_net_params(bp); 1007 dhcp_state = BOUND; 1008 printf("DHCP client bound to address %pI4 (%lu ms)\n", 1009 &net_ip, get_timer(bootp_start)); 1010 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, 1011 "bootp_stop"); 1012 1013 net_auto_load(); 1014 return; 1015 } 1016 break; 1017 case BOUND: 1018 /* DHCP client bound to address */ 1019 break; 1020 default: 1021 puts("DHCP: INVALID STATE\n"); 1022 break; 1023 } 1024 } 1025 1026 void dhcp_request(void) 1027 { 1028 bootp_request(); 1029 } 1030 #endif /* CONFIG_CMD_DHCP */ 1031