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 <efi_loader.h> 14 #include <net.h> 15 #include <net/tftp.h> 16 #include "bootp.h" 17 #ifdef CONFIG_LED_STATUS 18 #include <status_led.h> 19 #endif 20 #ifdef CONFIG_BOOTP_RANDOM_DELAY 21 #include "net_rand.h" 22 #endif 23 24 #define BOOTP_VENDOR_MAGIC 0x63825363 /* RFC1048 Magic Cookie */ 25 26 /* 27 * The timeout for the initial BOOTP/DHCP request used to be described by a 28 * counter of fixed-length timeout periods. TIMEOUT_COUNT represents 29 * that counter 30 * 31 * Now that the timeout periods are variable (exponential backoff and retry) 32 * we convert the timeout count to the absolute time it would have take to 33 * execute that many retries, and keep sending retry packets until that time 34 * is reached. 35 */ 36 #ifndef CONFIG_NET_RETRY_COUNT 37 # define TIMEOUT_COUNT 5 /* # of timeouts before giving up */ 38 #else 39 # define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT) 40 #endif 41 #define TIMEOUT_MS ((3 + (TIMEOUT_COUNT * 5)) * 1000) 42 43 #define PORT_BOOTPS 67 /* BOOTP server UDP port */ 44 #define PORT_BOOTPC 68 /* BOOTP client UDP port */ 45 46 #ifndef CONFIG_DHCP_MIN_EXT_LEN /* minimal length of extension list */ 47 #define CONFIG_DHCP_MIN_EXT_LEN 64 48 #endif 49 50 #ifndef CONFIG_BOOTP_ID_CACHE_SIZE 51 #define CONFIG_BOOTP_ID_CACHE_SIZE 4 52 #endif 53 54 u32 bootp_ids[CONFIG_BOOTP_ID_CACHE_SIZE]; 55 unsigned int bootp_num_ids; 56 int bootp_try; 57 ulong bootp_start; 58 ulong bootp_timeout; 59 char net_nis_domain[32] = {0,}; /* Our NIS domain */ 60 char net_hostname[32] = {0,}; /* Our hostname */ 61 char net_root_path[64] = {0,}; /* Our bootpath */ 62 63 static ulong time_taken_max; 64 65 #if defined(CONFIG_CMD_DHCP) 66 static dhcp_state_t dhcp_state = INIT; 67 static u32 dhcp_leasetime; 68 static struct in_addr dhcp_server_ip; 69 static u8 dhcp_option_overload; 70 #define OVERLOAD_FILE 1 71 #define OVERLOAD_SNAME 2 72 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip, 73 unsigned src, unsigned len); 74 75 /* For Debug */ 76 #if 0 77 static char *dhcpmsg2str(int type) 78 { 79 switch (type) { 80 case 1: return "DHCPDISCOVER"; break; 81 case 2: return "DHCPOFFER"; break; 82 case 3: return "DHCPREQUEST"; break; 83 case 4: return "DHCPDECLINE"; break; 84 case 5: return "DHCPACK"; break; 85 case 6: return "DHCPNACK"; break; 86 case 7: return "DHCPRELEASE"; break; 87 default: return "UNKNOWN/INVALID MSG TYPE"; break; 88 } 89 } 90 #endif 91 #endif 92 93 static void bootp_add_id(ulong id) 94 { 95 if (bootp_num_ids >= ARRAY_SIZE(bootp_ids)) { 96 size_t size = sizeof(bootp_ids) - sizeof(id); 97 98 memmove(bootp_ids, &bootp_ids[1], size); 99 bootp_ids[bootp_num_ids - 1] = id; 100 } else { 101 bootp_ids[bootp_num_ids] = id; 102 bootp_num_ids++; 103 } 104 } 105 106 static bool bootp_match_id(ulong id) 107 { 108 unsigned int i; 109 110 for (i = 0; i < bootp_num_ids; i++) 111 if (bootp_ids[i] == id) 112 return true; 113 114 return false; 115 } 116 117 static int check_reply_packet(uchar *pkt, unsigned dest, unsigned src, 118 unsigned len) 119 { 120 struct bootp_hdr *bp = (struct bootp_hdr *)pkt; 121 int retval = 0; 122 123 if (dest != PORT_BOOTPC || src != PORT_BOOTPS) 124 retval = -1; 125 else if (len < sizeof(struct bootp_hdr) - OPT_FIELD_SIZE) 126 retval = -2; 127 else if (bp->bp_op != OP_BOOTREPLY) 128 retval = -3; 129 else if (bp->bp_htype != HWT_ETHER) 130 retval = -4; 131 else if (bp->bp_hlen != HWL_ETHER) 132 retval = -5; 133 else if (!bootp_match_id(net_read_u32(&bp->bp_id))) 134 retval = -6; 135 else if (memcmp(bp->bp_chaddr, net_ethaddr, HWL_ETHER) != 0) 136 retval = -7; 137 138 debug("Filtering pkt = %d\n", retval); 139 140 return retval; 141 } 142 143 /* 144 * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet 145 */ 146 static void store_net_params(struct bootp_hdr *bp) 147 { 148 #if !defined(CONFIG_BOOTP_SERVERIP) 149 struct in_addr tmp_ip; 150 151 net_copy_ip(&tmp_ip, &bp->bp_siaddr); 152 if (tmp_ip.s_addr != 0) 153 net_copy_ip(&net_server_ip, &bp->bp_siaddr); 154 memcpy(net_server_ethaddr, 155 ((struct ethernet_hdr *)net_rx_packet)->et_src, 6); 156 if ( 157 #if defined(CONFIG_CMD_DHCP) 158 !(dhcp_option_overload & OVERLOAD_FILE) && 159 #endif 160 (strlen(bp->bp_file) > 0)) { 161 copy_filename(net_boot_file_name, bp->bp_file, 162 sizeof(net_boot_file_name)); 163 } 164 165 debug("net_boot_file_name: %s\n", net_boot_file_name); 166 167 /* Propagate to environment: 168 * don't delete exising entry when BOOTP / DHCP reply does 169 * not contain a new value 170 */ 171 if (*net_boot_file_name) 172 env_set("bootfile", net_boot_file_name); 173 #endif 174 net_copy_ip(&net_ip, &bp->bp_yiaddr); 175 } 176 177 static int truncate_sz(const char *name, int maxlen, int curlen) 178 { 179 if (curlen >= maxlen) { 180 printf("*** WARNING: %s is too long (%d - max: %d)" 181 " - truncated\n", name, curlen, maxlen); 182 curlen = maxlen - 1; 183 } 184 return curlen; 185 } 186 187 #if !defined(CONFIG_CMD_DHCP) 188 189 static void bootp_process_vendor_field(u8 *ext) 190 { 191 int size = *(ext + 1); 192 193 debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext, 194 *(ext + 1)); 195 196 net_boot_file_expected_size_in_blocks = 0; 197 198 switch (*ext) { 199 /* Fixed length fields */ 200 case 1: /* Subnet mask */ 201 if (net_netmask.s_addr == 0) 202 net_copy_ip(&net_netmask, (struct in_addr *)(ext + 2)); 203 break; 204 case 2: /* Time offset - Not yet supported */ 205 break; 206 /* Variable length fields */ 207 case 3: /* Gateways list */ 208 if (net_gateway.s_addr == 0) 209 net_copy_ip(&net_gateway, (struct in_addr *)(ext + 2)); 210 break; 211 case 4: /* Time server - Not yet supported */ 212 break; 213 case 5: /* IEN-116 name server - Not yet supported */ 214 break; 215 case 6: 216 if (net_dns_server.s_addr == 0) 217 net_copy_ip(&net_dns_server, 218 (struct in_addr *)(ext + 2)); 219 #if defined(CONFIG_BOOTP_DNS2) 220 if ((net_dns_server2.s_addr == 0) && (size > 4)) 221 net_copy_ip(&net_dns_server2, 222 (struct in_addr *)(ext + 2 + 4)); 223 #endif 224 break; 225 case 7: /* Log server - Not yet supported */ 226 break; 227 case 8: /* Cookie/Quote server - Not yet supported */ 228 break; 229 case 9: /* LPR server - Not yet supported */ 230 break; 231 case 10: /* Impress server - Not yet supported */ 232 break; 233 case 11: /* RPL server - Not yet supported */ 234 break; 235 case 12: /* Host name */ 236 if (net_hostname[0] == 0) { 237 size = truncate_sz("Host Name", 238 sizeof(net_hostname), size); 239 memcpy(&net_hostname, ext + 2, size); 240 net_hostname[size] = 0; 241 } 242 break; 243 case 13: /* Boot file size */ 244 if (size == 2) 245 net_boot_file_expected_size_in_blocks = 246 ntohs(*(ushort *)(ext + 2)); 247 else if (size == 4) 248 net_boot_file_expected_size_in_blocks = 249 ntohl(*(ulong *)(ext + 2)); 250 break; 251 case 14: /* Merit dump file - Not yet supported */ 252 break; 253 case 15: /* Domain name - Not yet supported */ 254 break; 255 case 16: /* Swap server - Not yet supported */ 256 break; 257 case 17: /* Root path */ 258 if (net_root_path[0] == 0) { 259 size = truncate_sz("Root Path", 260 sizeof(net_root_path), size); 261 memcpy(&net_root_path, ext + 2, size); 262 net_root_path[size] = 0; 263 } 264 break; 265 case 18: /* Extension path - Not yet supported */ 266 /* 267 * This can be used to send the information of the 268 * vendor area in another file that the client can 269 * access via TFTP. 270 */ 271 break; 272 /* IP host layer fields */ 273 case 40: /* NIS Domain name */ 274 if (net_nis_domain[0] == 0) { 275 size = truncate_sz("NIS Domain Name", 276 sizeof(net_nis_domain), size); 277 memcpy(&net_nis_domain, ext + 2, size); 278 net_nis_domain[size] = 0; 279 } 280 break; 281 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 282 case 42: /* NTP server IP */ 283 net_copy_ip(&net_ntp_server, (struct in_addr *)(ext + 2)); 284 break; 285 #endif 286 /* Application layer fields */ 287 case 43: /* Vendor specific info - Not yet supported */ 288 /* 289 * Binary information to exchange specific 290 * product information. 291 */ 292 break; 293 /* Reserved (custom) fields (128..254) */ 294 } 295 } 296 297 static void bootp_process_vendor(u8 *ext, int size) 298 { 299 u8 *end = ext + size; 300 301 debug("[BOOTP] Checking extension (%d bytes)...\n", size); 302 303 while ((ext < end) && (*ext != 0xff)) { 304 if (*ext == 0) { 305 ext++; 306 } else { 307 u8 *opt = ext; 308 309 ext += ext[1] + 2; 310 if (ext <= end) 311 bootp_process_vendor_field(opt); 312 } 313 } 314 315 debug("[BOOTP] Received fields:\n"); 316 if (net_netmask.s_addr) 317 debug("net_netmask : %pI4\n", &net_netmask); 318 319 if (net_gateway.s_addr) 320 debug("net_gateway : %pI4", &net_gateway); 321 322 if (net_boot_file_expected_size_in_blocks) 323 debug("net_boot_file_expected_size_in_blocks : %d\n", 324 net_boot_file_expected_size_in_blocks); 325 326 if (net_hostname[0]) 327 debug("net_hostname : %s\n", net_hostname); 328 329 if (net_root_path[0]) 330 debug("net_root_path : %s\n", net_root_path); 331 332 if (net_nis_domain[0]) 333 debug("net_nis_domain : %s\n", net_nis_domain); 334 335 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 336 if (net_ntp_server.s_addr) 337 debug("net_ntp_server : %pI4\n", &net_ntp_server); 338 #endif 339 } 340 341 /* 342 * Handle a BOOTP received packet. 343 */ 344 static void bootp_handler(uchar *pkt, unsigned dest, struct in_addr sip, 345 unsigned src, unsigned len) 346 { 347 struct bootp_hdr *bp; 348 349 debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n", 350 src, dest, len, sizeof(struct bootp_hdr)); 351 352 bp = (struct bootp_hdr *)pkt; 353 354 /* Filter out pkts we don't want */ 355 if (check_reply_packet(pkt, dest, src, len)) 356 return; 357 358 /* 359 * Got a good BOOTP reply. Copy the data into our variables. 360 */ 361 #if defined(CONFIG_LED_STATUS) && defined(CONFIG_LED_STATUS_BOOT_ENABLE) 362 status_led_set(CONFIG_LED_STATUS_BOOT, CONFIG_LED_STATUS_OFF); 363 #endif 364 365 store_net_params(bp); /* Store net parameters from reply */ 366 367 /* Retrieve extended information (we must parse the vendor area) */ 368 if (net_read_u32((u32 *)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 369 bootp_process_vendor((uchar *)&bp->bp_vend[4], len); 370 371 net_set_timeout_handler(0, (thand_f *)0); 372 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop"); 373 374 debug("Got good BOOTP\n"); 375 376 net_auto_load(); 377 } 378 #endif 379 380 /* 381 * Timeout on BOOTP/DHCP request. 382 */ 383 static void bootp_timeout_handler(void) 384 { 385 ulong time_taken = get_timer(bootp_start); 386 387 if (time_taken >= time_taken_max) { 388 #ifdef CONFIG_BOOTP_MAY_FAIL 389 char *ethrotate; 390 391 ethrotate = env_get("ethrotate"); 392 if ((ethrotate && strcmp(ethrotate, "no") == 0) || 393 net_restart_wrap) { 394 puts("\nRetry time exceeded\n"); 395 net_set_state(NETLOOP_FAIL); 396 } else 397 #endif 398 { 399 puts("\nRetry time exceeded; starting again\n"); 400 net_start_again(); 401 } 402 } else { 403 bootp_timeout *= 2; 404 if (bootp_timeout > 2000) 405 bootp_timeout = 2000; 406 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler); 407 bootp_request(); 408 } 409 } 410 411 #define put_vci(e, str) \ 412 do { \ 413 size_t vci_strlen = strlen(str); \ 414 *e++ = 60; /* Vendor Class Identifier */ \ 415 *e++ = vci_strlen; \ 416 memcpy(e, str, vci_strlen); \ 417 e += vci_strlen; \ 418 } while (0) 419 420 static u8 *add_vci(u8 *e) 421 { 422 char *vci = NULL; 423 char *env_vci = env_get("bootp_vci"); 424 425 #if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING) 426 vci = CONFIG_SPL_NET_VCI_STRING; 427 #elif defined(CONFIG_BOOTP_VCI_STRING) 428 vci = CONFIG_BOOTP_VCI_STRING; 429 #endif 430 431 if (env_vci) 432 vci = env_vci; 433 434 if (vci) 435 put_vci(e, vci); 436 437 return e; 438 } 439 440 /* 441 * Initialize BOOTP extension fields in the request. 442 */ 443 #if defined(CONFIG_CMD_DHCP) 444 static int dhcp_extended(u8 *e, int message_type, struct in_addr server_ip, 445 struct in_addr requested_ip) 446 { 447 u8 *start = e; 448 u8 *cnt; 449 #ifdef CONFIG_LIB_UUID 450 char *uuid; 451 #endif 452 int clientarch = -1; 453 454 #if defined(CONFIG_BOOTP_VENDOREX) 455 u8 *x; 456 #endif 457 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 458 char *hostname; 459 #endif 460 461 *e++ = 99; /* RFC1048 Magic Cookie */ 462 *e++ = 130; 463 *e++ = 83; 464 *e++ = 99; 465 466 *e++ = 53; /* DHCP Message Type */ 467 *e++ = 1; 468 *e++ = message_type; 469 470 *e++ = 57; /* Maximum DHCP Message Size */ 471 *e++ = 2; 472 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 8; 473 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff; 474 475 if (server_ip.s_addr) { 476 int tmp = ntohl(server_ip.s_addr); 477 478 *e++ = 54; /* ServerID */ 479 *e++ = 4; 480 *e++ = tmp >> 24; 481 *e++ = tmp >> 16; 482 *e++ = tmp >> 8; 483 *e++ = tmp & 0xff; 484 } 485 486 if (requested_ip.s_addr) { 487 int tmp = ntohl(requested_ip.s_addr); 488 489 *e++ = 50; /* Requested IP */ 490 *e++ = 4; 491 *e++ = tmp >> 24; 492 *e++ = tmp >> 16; 493 *e++ = tmp >> 8; 494 *e++ = tmp & 0xff; 495 } 496 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 497 hostname = env_get("hostname"); 498 if (hostname) { 499 int hostnamelen = strlen(hostname); 500 501 *e++ = 12; /* Hostname */ 502 *e++ = hostnamelen; 503 memcpy(e, hostname, hostnamelen); 504 e += hostnamelen; 505 } 506 #endif 507 508 #ifdef CONFIG_BOOTP_PXE_CLIENTARCH 509 clientarch = CONFIG_BOOTP_PXE_CLIENTARCH; 510 #endif 511 512 if (env_get("bootp_arch")) 513 clientarch = env_get_ulong("bootp_arch", 16, clientarch); 514 515 if (clientarch > 0) { 516 *e++ = 93; /* Client System Architecture */ 517 *e++ = 2; 518 *e++ = (clientarch >> 8) & 0xff; 519 *e++ = clientarch & 0xff; 520 } 521 522 *e++ = 94; /* Client Network Interface Identifier */ 523 *e++ = 3; 524 *e++ = 1; /* type field for UNDI */ 525 *e++ = 0; /* major revision */ 526 *e++ = 0; /* minor revision */ 527 528 #ifdef CONFIG_LIB_UUID 529 uuid = env_get("pxeuuid"); 530 531 if (uuid) { 532 if (uuid_str_valid(uuid)) { 533 *e++ = 97; /* Client Machine Identifier */ 534 *e++ = 17; 535 *e++ = 0; /* type 0 - UUID */ 536 537 uuid_str_to_bin(uuid, e, UUID_STR_FORMAT_STD); 538 e += 16; 539 } else { 540 printf("Invalid pxeuuid: %s\n", uuid); 541 } 542 } 543 #endif 544 545 e = add_vci(e); 546 547 #if defined(CONFIG_BOOTP_VENDOREX) 548 x = dhcp_vendorex_prep(e); 549 if (x) 550 return x - start; 551 #endif 552 553 *e++ = 55; /* Parameter Request List */ 554 cnt = e++; /* Pointer to count of requested items */ 555 *cnt = 0; 556 #if defined(CONFIG_BOOTP_SUBNETMASK) 557 *e++ = 1; /* Subnet Mask */ 558 *cnt += 1; 559 #endif 560 #if defined(CONFIG_BOOTP_TIMEOFFSET) 561 *e++ = 2; 562 *cnt += 1; 563 #endif 564 #if defined(CONFIG_BOOTP_GATEWAY) 565 *e++ = 3; /* Router Option */ 566 *cnt += 1; 567 #endif 568 #if defined(CONFIG_BOOTP_DNS) 569 *e++ = 6; /* DNS Server(s) */ 570 *cnt += 1; 571 #endif 572 #if defined(CONFIG_BOOTP_HOSTNAME) 573 *e++ = 12; /* Hostname */ 574 *cnt += 1; 575 #endif 576 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 577 *e++ = 13; /* Boot File Size */ 578 *cnt += 1; 579 #endif 580 #if defined(CONFIG_BOOTP_BOOTPATH) 581 *e++ = 17; /* Boot path */ 582 *cnt += 1; 583 #endif 584 #if defined(CONFIG_BOOTP_NISDOMAIN) 585 *e++ = 40; /* NIS Domain name request */ 586 *cnt += 1; 587 #endif 588 #if defined(CONFIG_BOOTP_NTPSERVER) 589 *e++ = 42; 590 *cnt += 1; 591 #endif 592 /* no options, so back up to avoid sending an empty request list */ 593 if (*cnt == 0) 594 e -= 2; 595 596 *e++ = 255; /* End of the list */ 597 598 /* Pad to minimal length */ 599 #ifdef CONFIG_DHCP_MIN_EXT_LEN 600 while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN) 601 *e++ = 0; 602 #endif 603 604 return e - start; 605 } 606 607 #else 608 /* 609 * Warning: no field size check - change CONFIG_BOOTP_* at your own risk! 610 */ 611 static int bootp_extended(u8 *e) 612 { 613 u8 *start = e; 614 615 *e++ = 99; /* RFC1048 Magic Cookie */ 616 *e++ = 130; 617 *e++ = 83; 618 *e++ = 99; 619 620 #if defined(CONFIG_CMD_DHCP) 621 *e++ = 53; /* DHCP Message Type */ 622 *e++ = 1; 623 *e++ = DHCP_DISCOVER; 624 625 *e++ = 57; /* Maximum DHCP Message Size */ 626 *e++ = 2; 627 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 16; 628 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff; 629 #endif 630 631 add_vci(e); 632 633 #if defined(CONFIG_BOOTP_SUBNETMASK) 634 *e++ = 1; /* Subnet mask request */ 635 *e++ = 4; 636 e += 4; 637 #endif 638 639 #if defined(CONFIG_BOOTP_GATEWAY) 640 *e++ = 3; /* Default gateway request */ 641 *e++ = 4; 642 e += 4; 643 #endif 644 645 #if defined(CONFIG_BOOTP_DNS) 646 *e++ = 6; /* Domain Name Server */ 647 *e++ = 4; 648 e += 4; 649 #endif 650 651 #if defined(CONFIG_BOOTP_HOSTNAME) 652 *e++ = 12; /* Host name request */ 653 *e++ = 32; 654 e += 32; 655 #endif 656 657 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 658 *e++ = 13; /* Boot file size */ 659 *e++ = 2; 660 e += 2; 661 #endif 662 663 #if defined(CONFIG_BOOTP_BOOTPATH) 664 *e++ = 17; /* Boot path */ 665 *e++ = 32; 666 e += 32; 667 #endif 668 669 #if defined(CONFIG_BOOTP_NISDOMAIN) 670 *e++ = 40; /* NIS Domain name request */ 671 *e++ = 32; 672 e += 32; 673 #endif 674 #if defined(CONFIG_BOOTP_NTPSERVER) 675 *e++ = 42; 676 *e++ = 4; 677 e += 4; 678 #endif 679 680 *e++ = 255; /* End of the list */ 681 682 /* 683 * If nothing in list, remove it altogether. Some DHCP servers get 684 * upset by this minor faux pas and do not respond at all. 685 */ 686 if (e == start + 3) { 687 printf("*** Warning: no DHCP options requested\n"); 688 e -= 3; 689 } 690 691 return e - start; 692 } 693 #endif 694 695 void bootp_reset(void) 696 { 697 bootp_num_ids = 0; 698 bootp_try = 0; 699 bootp_start = get_timer(0); 700 bootp_timeout = 250; 701 } 702 703 void bootp_request(void) 704 { 705 uchar *pkt, *iphdr; 706 struct bootp_hdr *bp; 707 int extlen, pktlen, iplen; 708 int eth_hdr_size; 709 #ifdef CONFIG_BOOTP_RANDOM_DELAY 710 ulong rand_ms; 711 #endif 712 u32 bootp_id; 713 struct in_addr zero_ip; 714 struct in_addr bcast_ip; 715 char *ep; /* Environment pointer */ 716 717 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start"); 718 #if defined(CONFIG_CMD_DHCP) 719 dhcp_state = INIT; 720 #endif 721 722 ep = env_get("bootpretryperiod"); 723 if (ep != NULL) 724 time_taken_max = simple_strtoul(ep, NULL, 10); 725 else 726 time_taken_max = TIMEOUT_MS; 727 728 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */ 729 if (bootp_try == 0) 730 srand_mac(); 731 732 if (bootp_try <= 2) /* Start with max 1024 * 1ms */ 733 rand_ms = rand() >> (22 - bootp_try); 734 else /* After 3rd BOOTP request max 8192 * 1ms */ 735 rand_ms = rand() >> 19; 736 737 printf("Random delay: %ld ms...\n", rand_ms); 738 mdelay(rand_ms); 739 740 #endif /* CONFIG_BOOTP_RANDOM_DELAY */ 741 742 printf("BOOTP broadcast %d\n", ++bootp_try); 743 pkt = net_tx_packet; 744 memset((void *)pkt, 0, PKTSIZE); 745 746 eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP); 747 pkt += eth_hdr_size; 748 749 /* 750 * Next line results in incorrect packet size being transmitted, 751 * resulting in errors in some DHCP servers, reporting missing bytes. 752 * Size must be set in packet header after extension length has been 753 * determined. 754 * C. Hallinan, DS4.COM, Inc. 755 */ 756 /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, 757 sizeof (struct bootp_hdr)); */ 758 iphdr = pkt; /* We need this later for net_set_udp_header() */ 759 pkt += IP_UDP_HDR_SIZE; 760 761 bp = (struct bootp_hdr *)pkt; 762 bp->bp_op = OP_BOOTREQUEST; 763 bp->bp_htype = HWT_ETHER; 764 bp->bp_hlen = HWL_ETHER; 765 bp->bp_hops = 0; 766 /* 767 * according to RFC1542, should be 0 on first request, secs since 768 * first request otherwise 769 */ 770 bp->bp_secs = htons(get_timer(bootp_start) / 1000); 771 zero_ip.s_addr = 0; 772 net_write_ip(&bp->bp_ciaddr, zero_ip); 773 net_write_ip(&bp->bp_yiaddr, zero_ip); 774 net_write_ip(&bp->bp_siaddr, zero_ip); 775 net_write_ip(&bp->bp_giaddr, zero_ip); 776 memcpy(bp->bp_chaddr, net_ethaddr, 6); 777 copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file)); 778 779 /* Request additional information from the BOOTP/DHCP server */ 780 #if defined(CONFIG_CMD_DHCP) 781 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_DISCOVER, zero_ip, 782 zero_ip); 783 #else 784 extlen = bootp_extended((u8 *)bp->bp_vend); 785 #endif 786 787 /* 788 * Bootp ID is the lower 4 bytes of our ethernet address 789 * plus the current time in ms. 790 */ 791 bootp_id = ((u32)net_ethaddr[2] << 24) 792 | ((u32)net_ethaddr[3] << 16) 793 | ((u32)net_ethaddr[4] << 8) 794 | (u32)net_ethaddr[5]; 795 bootp_id += get_timer(0); 796 bootp_id = htonl(bootp_id); 797 bootp_add_id(bootp_id); 798 net_copy_u32(&bp->bp_id, &bootp_id); 799 800 /* 801 * Calculate proper packet lengths taking into account the 802 * variable size of the options field 803 */ 804 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen; 805 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen; 806 bcast_ip.s_addr = 0xFFFFFFFFL; 807 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen); 808 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler); 809 810 #if defined(CONFIG_CMD_DHCP) 811 dhcp_state = SELECTING; 812 net_set_udp_handler(dhcp_handler); 813 #else 814 net_set_udp_handler(bootp_handler); 815 #endif 816 net_send_packet(net_tx_packet, pktlen); 817 } 818 819 #if defined(CONFIG_CMD_DHCP) 820 static void dhcp_process_options(uchar *popt, uchar *end) 821 { 822 int oplen, size; 823 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 824 int *to_ptr; 825 #endif 826 827 while (popt < end && *popt != 0xff) { 828 oplen = *(popt + 1); 829 switch (*popt) { 830 case 0: 831 oplen = -1; /* Pad omits len byte */ 832 break; 833 case 1: 834 net_copy_ip(&net_netmask, (popt + 2)); 835 break; 836 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 837 case 2: /* Time offset */ 838 to_ptr = &net_ntp_time_offset; 839 net_copy_u32((u32 *)to_ptr, (u32 *)(popt + 2)); 840 net_ntp_time_offset = ntohl(net_ntp_time_offset); 841 break; 842 #endif 843 case 3: 844 net_copy_ip(&net_gateway, (popt + 2)); 845 break; 846 case 6: 847 net_copy_ip(&net_dns_server, (popt + 2)); 848 #if defined(CONFIG_BOOTP_DNS2) 849 if (*(popt + 1) > 4) 850 net_copy_ip(&net_dns_server2, (popt + 2 + 4)); 851 #endif 852 break; 853 case 12: 854 size = truncate_sz("Host Name", 855 sizeof(net_hostname), oplen); 856 memcpy(&net_hostname, popt + 2, size); 857 net_hostname[size] = 0; 858 break; 859 case 15: /* Ignore Domain Name Option */ 860 break; 861 case 17: 862 size = truncate_sz("Root Path", 863 sizeof(net_root_path), oplen); 864 memcpy(&net_root_path, popt + 2, size); 865 net_root_path[size] = 0; 866 break; 867 case 28: /* Ignore Broadcast Address Option */ 868 break; 869 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 870 case 42: /* NTP server IP */ 871 net_copy_ip(&net_ntp_server, (popt + 2)); 872 break; 873 #endif 874 case 51: 875 net_copy_u32(&dhcp_leasetime, (u32 *)(popt + 2)); 876 break; 877 case 52: 878 dhcp_option_overload = popt[2]; 879 break; 880 case 53: /* Ignore Message Type Option */ 881 break; 882 case 54: 883 net_copy_ip(&dhcp_server_ip, (popt + 2)); 884 break; 885 case 58: /* Ignore Renewal Time Option */ 886 break; 887 case 59: /* Ignore Rebinding Time Option */ 888 break; 889 case 66: /* Ignore TFTP server name */ 890 break; 891 case 67: /* Bootfile option */ 892 size = truncate_sz("Bootfile", 893 sizeof(net_boot_file_name), oplen); 894 memcpy(&net_boot_file_name, popt + 2, size); 895 net_boot_file_name[size] = 0; 896 break; 897 default: 898 #if defined(CONFIG_BOOTP_VENDOREX) 899 if (dhcp_vendorex_proc(popt)) 900 break; 901 #endif 902 printf("*** Unhandled DHCP Option in OFFER/ACK:" 903 " %d\n", *popt); 904 break; 905 } 906 popt += oplen + 2; /* Process next option */ 907 } 908 } 909 910 static void dhcp_packet_process_options(struct bootp_hdr *bp) 911 { 912 uchar *popt = (uchar *)&bp->bp_vend[4]; 913 uchar *end = popt + BOOTP_HDR_SIZE; 914 915 if (net_read_u32((u32 *)&bp->bp_vend[0]) != htonl(BOOTP_VENDOR_MAGIC)) 916 return; 917 918 dhcp_option_overload = 0; 919 920 /* 921 * The 'options' field MUST be interpreted first, 'file' next, 922 * 'sname' last. 923 */ 924 dhcp_process_options(popt, end); 925 926 if (dhcp_option_overload & OVERLOAD_FILE) { 927 popt = (uchar *)bp->bp_file; 928 end = popt + sizeof(bp->bp_file); 929 dhcp_process_options(popt, end); 930 } 931 932 if (dhcp_option_overload & OVERLOAD_SNAME) { 933 popt = (uchar *)bp->bp_sname; 934 end = popt + sizeof(bp->bp_sname); 935 dhcp_process_options(popt, end); 936 } 937 } 938 939 static int dhcp_message_type(unsigned char *popt) 940 { 941 if (net_read_u32((u32 *)popt) != htonl(BOOTP_VENDOR_MAGIC)) 942 return -1; 943 944 popt += 4; 945 while (*popt != 0xff) { 946 if (*popt == 53) /* DHCP Message Type */ 947 return *(popt + 2); 948 if (*popt == 0) { 949 /* Pad */ 950 popt += 1; 951 } else { 952 /* Scan through all options */ 953 popt += *(popt + 1) + 2; 954 } 955 } 956 return -1; 957 } 958 959 static void dhcp_send_request_packet(struct bootp_hdr *bp_offer) 960 { 961 uchar *pkt, *iphdr; 962 struct bootp_hdr *bp; 963 int pktlen, iplen, extlen; 964 int eth_hdr_size; 965 struct in_addr offered_ip; 966 struct in_addr zero_ip; 967 struct in_addr bcast_ip; 968 969 debug("dhcp_send_request_packet: Sending DHCPREQUEST\n"); 970 pkt = net_tx_packet; 971 memset((void *)pkt, 0, PKTSIZE); 972 973 eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP); 974 pkt += eth_hdr_size; 975 976 iphdr = pkt; /* We'll need this later to set proper pkt size */ 977 pkt += IP_UDP_HDR_SIZE; 978 979 bp = (struct bootp_hdr *)pkt; 980 bp->bp_op = OP_BOOTREQUEST; 981 bp->bp_htype = HWT_ETHER; 982 bp->bp_hlen = HWL_ETHER; 983 bp->bp_hops = 0; 984 bp->bp_secs = htons(get_timer(bootp_start) / 1000); 985 /* Do not set the client IP, your IP, or server IP yet, since it 986 * hasn't been ACK'ed by the server yet */ 987 988 /* 989 * RFC3046 requires Relay Agents to discard packets with 990 * nonzero and offered giaddr 991 */ 992 zero_ip.s_addr = 0; 993 net_write_ip(&bp->bp_giaddr, zero_ip); 994 995 memcpy(bp->bp_chaddr, net_ethaddr, 6); 996 copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file)); 997 998 /* 999 * ID is the id of the OFFER packet 1000 */ 1001 1002 net_copy_u32(&bp->bp_id, &bp_offer->bp_id); 1003 1004 /* 1005 * Copy options from OFFER packet if present 1006 */ 1007 1008 /* Copy offered IP into the parameters request list */ 1009 net_copy_ip(&offered_ip, &bp_offer->bp_yiaddr); 1010 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST, 1011 dhcp_server_ip, offered_ip); 1012 1013 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen; 1014 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen; 1015 bcast_ip.s_addr = 0xFFFFFFFFL; 1016 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen); 1017 1018 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY 1019 udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY); 1020 #endif /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */ 1021 debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen); 1022 net_send_packet(net_tx_packet, pktlen); 1023 } 1024 1025 /* 1026 * Handle DHCP received packets. 1027 */ 1028 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip, 1029 unsigned src, unsigned len) 1030 { 1031 struct bootp_hdr *bp = (struct bootp_hdr *)pkt; 1032 1033 debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n", 1034 src, dest, len, dhcp_state); 1035 1036 /* Filter out pkts we don't want */ 1037 if (check_reply_packet(pkt, dest, src, len)) 1038 return; 1039 1040 debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: " 1041 "%d\n", src, dest, len, dhcp_state); 1042 1043 if (net_read_ip(&bp->bp_yiaddr).s_addr == 0) 1044 return; 1045 1046 switch (dhcp_state) { 1047 case SELECTING: 1048 /* 1049 * Wait an appropriate time for any potential DHCPOFFER packets 1050 * to arrive. Then select one, and generate DHCPREQUEST 1051 * response. If filename is in format we recognize, assume it 1052 * is a valid OFFER from a server we want. 1053 */ 1054 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file); 1055 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 1056 if (strncmp(bp->bp_file, 1057 CONFIG_SYS_BOOTFILE_PREFIX, 1058 strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) { 1059 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 1060 dhcp_packet_process_options(bp); 1061 efi_net_set_dhcp_ack(pkt, len); 1062 1063 debug("TRANSITIONING TO REQUESTING STATE\n"); 1064 dhcp_state = REQUESTING; 1065 1066 net_set_timeout_handler(5000, bootp_timeout_handler); 1067 dhcp_send_request_packet(bp); 1068 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 1069 } 1070 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 1071 1072 return; 1073 break; 1074 case REQUESTING: 1075 debug("DHCP State: REQUESTING\n"); 1076 1077 if (dhcp_message_type((u8 *)bp->bp_vend) == DHCP_ACK) { 1078 dhcp_packet_process_options(bp); 1079 /* Store net params from reply */ 1080 store_net_params(bp); 1081 dhcp_state = BOUND; 1082 printf("DHCP client bound to address %pI4 (%lu ms)\n", 1083 &net_ip, get_timer(bootp_start)); 1084 net_set_timeout_handler(0, (thand_f *)0); 1085 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, 1086 "bootp_stop"); 1087 1088 net_auto_load(); 1089 return; 1090 } 1091 break; 1092 case BOUND: 1093 /* DHCP client bound to address */ 1094 break; 1095 default: 1096 puts("DHCP: INVALID STATE\n"); 1097 break; 1098 } 1099 } 1100 1101 void dhcp_request(void) 1102 { 1103 bootp_request(); 1104 } 1105 #endif /* CONFIG_CMD_DHCP */ 1106