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 BootpTry; 57 ulong bootp_start; 58 ulong bootp_timeout; 59 60 #if defined(CONFIG_CMD_DHCP) 61 static dhcp_state_t dhcp_state = INIT; 62 static unsigned long dhcp_leasetime; 63 static struct in_addr dhcp_server_ip; 64 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip, 65 unsigned src, unsigned len); 66 67 /* For Debug */ 68 #if 0 69 static char *dhcpmsg2str(int type) 70 { 71 switch (type) { 72 case 1: return "DHCPDISCOVER"; break; 73 case 2: return "DHCPOFFER"; break; 74 case 3: return "DHCPREQUEST"; break; 75 case 4: return "DHCPDECLINE"; break; 76 case 5: return "DHCPACK"; break; 77 case 6: return "DHCPNACK"; break; 78 case 7: return "DHCPRELEASE"; break; 79 default: return "UNKNOWN/INVALID MSG TYPE"; break; 80 } 81 } 82 #endif 83 #endif 84 85 static void bootp_add_id(ulong id) 86 { 87 if (bootp_num_ids >= ARRAY_SIZE(bootp_ids)) { 88 size_t size = sizeof(bootp_ids) - sizeof(id); 89 90 memmove(bootp_ids, &bootp_ids[1], size); 91 bootp_ids[bootp_num_ids - 1] = id; 92 } else { 93 bootp_ids[bootp_num_ids] = id; 94 bootp_num_ids++; 95 } 96 } 97 98 static bool bootp_match_id(ulong id) 99 { 100 unsigned int i; 101 102 for (i = 0; i < bootp_num_ids; i++) 103 if (bootp_ids[i] == id) 104 return true; 105 106 return false; 107 } 108 109 static int BootpCheckPkt(uchar *pkt, unsigned dest, unsigned src, unsigned len) 110 { 111 struct Bootp_t *bp = (struct Bootp_t *) pkt; 112 int retval = 0; 113 114 if (dest != PORT_BOOTPC || src != PORT_BOOTPS) 115 retval = -1; 116 else if (len < sizeof(struct Bootp_t) - OPT_FIELD_SIZE) 117 retval = -2; 118 else if (bp->bp_op != OP_BOOTREQUEST && 119 bp->bp_op != OP_BOOTREPLY && 120 bp->bp_op != DHCP_OFFER && 121 bp->bp_op != DHCP_ACK && 122 bp->bp_op != DHCP_NAK) 123 retval = -3; 124 else if (bp->bp_htype != HWT_ETHER) 125 retval = -4; 126 else if (bp->bp_hlen != HWL_ETHER) 127 retval = -5; 128 else if (!bootp_match_id(NetReadLong((ulong *)&bp->bp_id))) 129 retval = -6; 130 131 debug("Filtering pkt = %d\n", retval); 132 133 return retval; 134 } 135 136 /* 137 * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet 138 */ 139 static void BootpCopyNetParams(struct Bootp_t *bp) 140 { 141 #if !defined(CONFIG_BOOTP_SERVERIP) 142 struct in_addr tmp_ip; 143 144 net_copy_ip(&tmp_ip, &bp->bp_siaddr); 145 if (tmp_ip.s_addr != 0) 146 net_copy_ip(&net_server_ip, &bp->bp_siaddr); 147 memcpy(NetServerEther, ((struct ethernet_hdr *)NetRxPacket)->et_src, 6); 148 if (strlen(bp->bp_file) > 0) 149 copy_filename(net_boot_file_name, bp->bp_file, 150 sizeof(net_boot_file_name)); 151 152 debug("net_boot_file_name: %s\n", net_boot_file_name); 153 154 /* Propagate to environment: 155 * don't delete exising entry when BOOTP / DHCP reply does 156 * not contain a new value 157 */ 158 if (*net_boot_file_name) 159 setenv("bootfile", net_boot_file_name); 160 #endif 161 net_copy_ip(&net_ip, &bp->bp_yiaddr); 162 } 163 164 static int truncate_sz(const char *name, int maxlen, int curlen) 165 { 166 if (curlen >= maxlen) { 167 printf("*** WARNING: %s is too long (%d - max: %d)" 168 " - truncated\n", name, curlen, maxlen); 169 curlen = maxlen - 1; 170 } 171 return curlen; 172 } 173 174 #if !defined(CONFIG_CMD_DHCP) 175 176 static void BootpVendorFieldProcess(u8 *ext) 177 { 178 int size = *(ext + 1); 179 180 debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext, 181 *(ext + 1)); 182 183 net_boot_file_expected_size_in_blocks = 0; 184 185 switch (*ext) { 186 /* Fixed length fields */ 187 case 1: /* Subnet mask */ 188 if (net_netmask.s_addr == 0) 189 net_copy_ip(&net_netmask, (struct in_addr *)(ext + 2)); 190 break; 191 case 2: /* Time offset - Not yet supported */ 192 break; 193 /* Variable length fields */ 194 case 3: /* Gateways list */ 195 if (net_gateway.s_addr == 0) 196 net_copy_ip(&net_gateway, (struct in_addr *)(ext + 2)); 197 break; 198 case 4: /* Time server - Not yet supported */ 199 break; 200 case 5: /* IEN-116 name server - Not yet supported */ 201 break; 202 case 6: 203 if (net_dns_server.s_addr == 0) 204 net_copy_ip(&net_dns_server, 205 (struct in_addr *)(ext + 2)); 206 #if defined(CONFIG_BOOTP_DNS2) 207 if ((net_dns_server2.s_addr == 0) && (size > 4)) 208 net_copy_ip(&net_dns_server2, 209 (struct in_addr *)(ext + 2 + 4)); 210 #endif 211 break; 212 case 7: /* Log server - Not yet supported */ 213 break; 214 case 8: /* Cookie/Quote server - Not yet supported */ 215 break; 216 case 9: /* LPR server - Not yet supported */ 217 break; 218 case 10: /* Impress server - Not yet supported */ 219 break; 220 case 11: /* RPL server - Not yet supported */ 221 break; 222 case 12: /* Host name */ 223 if (NetOurHostName[0] == 0) { 224 size = truncate_sz("Host Name", 225 sizeof(NetOurHostName), size); 226 memcpy(&NetOurHostName, ext + 2, size); 227 NetOurHostName[size] = 0; 228 } 229 break; 230 case 13: /* Boot file size */ 231 if (size == 2) 232 net_boot_file_expected_size_in_blocks = 233 ntohs(*(ushort *)(ext + 2)); 234 else if (size == 4) 235 net_boot_file_expected_size_in_blocks = 236 ntohl(*(ulong *)(ext + 2)); 237 break; 238 case 14: /* Merit dump file - Not yet supported */ 239 break; 240 case 15: /* Domain name - Not yet supported */ 241 break; 242 case 16: /* Swap server - Not yet supported */ 243 break; 244 case 17: /* Root path */ 245 if (NetOurRootPath[0] == 0) { 246 size = truncate_sz("Root Path", 247 sizeof(NetOurRootPath), size); 248 memcpy(&NetOurRootPath, ext + 2, size); 249 NetOurRootPath[size] = 0; 250 } 251 break; 252 case 18: /* Extension path - Not yet supported */ 253 /* 254 * This can be used to send the information of the 255 * vendor area in another file that the client can 256 * access via TFTP. 257 */ 258 break; 259 /* IP host layer fields */ 260 case 40: /* NIS Domain name */ 261 if (NetOurNISDomain[0] == 0) { 262 size = truncate_sz("NIS Domain Name", 263 sizeof(NetOurNISDomain), size); 264 memcpy(&NetOurNISDomain, ext + 2, size); 265 NetOurNISDomain[size] = 0; 266 } 267 break; 268 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 269 case 42: /* NTP server IP */ 270 net_copy_ip(&net_ntp_server, (struct in_addr *)(ext + 2)); 271 break; 272 #endif 273 /* Application layer fields */ 274 case 43: /* Vendor specific info - Not yet supported */ 275 /* 276 * Binary information to exchange specific 277 * product information. 278 */ 279 break; 280 /* Reserved (custom) fields (128..254) */ 281 } 282 } 283 284 static void BootpVendorProcess(u8 *ext, int size) 285 { 286 u8 *end = ext + size; 287 288 debug("[BOOTP] Checking extension (%d bytes)...\n", size); 289 290 while ((ext < end) && (*ext != 0xff)) { 291 if (*ext == 0) { 292 ext++; 293 } else { 294 u8 *opt = ext; 295 296 ext += ext[1] + 2; 297 if (ext <= end) 298 BootpVendorFieldProcess(opt); 299 } 300 } 301 302 debug("[BOOTP] Received fields:\n"); 303 if (net_netmask.s_addr) 304 debug("net_netmask : %pI4\n", &net_netmask); 305 306 if (net_gateway.s_addr) 307 debug("net_gateway : %pI4", &net_gateway); 308 309 if (net_boot_file_expected_size_in_blocks) 310 debug("net_boot_file_expected_size_in_blocks : %d\n", 311 net_boot_file_expected_size_in_blocks); 312 313 if (NetOurHostName[0]) 314 debug("NetOurHostName : %s\n", NetOurHostName); 315 316 if (NetOurRootPath[0]) 317 debug("NetOurRootPath : %s\n", NetOurRootPath); 318 319 if (NetOurNISDomain[0]) 320 debug("NetOurNISDomain : %s\n", NetOurNISDomain); 321 322 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 323 if (net_ntp_server) 324 debug("net_ntp_server : %pI4\n", &net_ntp_server); 325 #endif 326 } 327 328 /* 329 * Handle a BOOTP received packet. 330 */ 331 static void bootp_handler(uchar *pkt, unsigned dest, struct in_addr sip, 332 unsigned src, unsigned len) 333 { 334 struct Bootp_t *bp; 335 336 debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n", 337 src, dest, len, sizeof(struct Bootp_t)); 338 339 bp = (struct Bootp_t *)pkt; 340 341 /* Filter out pkts we don't want */ 342 if (BootpCheckPkt(pkt, dest, src, len)) 343 return; 344 345 /* 346 * Got a good BOOTP reply. Copy the data into our variables. 347 */ 348 #ifdef CONFIG_STATUS_LED 349 status_led_set(STATUS_LED_BOOT, STATUS_LED_OFF); 350 #endif 351 352 BootpCopyNetParams(bp); /* Store net parameters from reply */ 353 354 /* Retrieve extended information (we must parse the vendor area) */ 355 if (NetReadLong((ulong *)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 356 BootpVendorProcess((uchar *)&bp->bp_vend[4], len); 357 358 NetSetTimeout(0, (thand_f *)0); 359 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop"); 360 361 debug("Got good BOOTP\n"); 362 363 net_auto_load(); 364 } 365 #endif 366 367 /* 368 * Timeout on BOOTP/DHCP request. 369 */ 370 static void 371 BootpTimeout(void) 372 { 373 ulong time_taken = get_timer(bootp_start); 374 375 if (time_taken >= TIMEOUT_MS) { 376 #ifdef CONFIG_BOOTP_MAY_FAIL 377 puts("\nRetry time exceeded\n"); 378 net_set_state(NETLOOP_FAIL); 379 #else 380 puts("\nRetry time exceeded; starting again\n"); 381 NetStartAgain(); 382 #endif 383 } else { 384 bootp_timeout *= 2; 385 if (bootp_timeout > 2000) 386 bootp_timeout = 2000; 387 NetSetTimeout(bootp_timeout, BootpTimeout); 388 BootpRequest(); 389 } 390 } 391 392 #define put_vci(e, str) \ 393 do { \ 394 size_t vci_strlen = strlen(str); \ 395 *e++ = 60; /* Vendor Class Identifier */ \ 396 *e++ = vci_strlen; \ 397 memcpy(e, str, vci_strlen); \ 398 e += vci_strlen; \ 399 } while (0) 400 401 /* 402 * Initialize BOOTP extension fields in the request. 403 */ 404 #if defined(CONFIG_CMD_DHCP) 405 static int dhcp_extended(u8 *e, int message_type, struct in_addr server_ip, 406 struct in_addr requested_ip) 407 { 408 u8 *start = e; 409 u8 *cnt; 410 #if defined(CONFIG_BOOTP_PXE) 411 char *uuid; 412 u16 clientarch; 413 #endif 414 415 #if defined(CONFIG_BOOTP_VENDOREX) 416 u8 *x; 417 #endif 418 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 419 char *hostname; 420 #endif 421 422 *e++ = 99; /* RFC1048 Magic Cookie */ 423 *e++ = 130; 424 *e++ = 83; 425 *e++ = 99; 426 427 *e++ = 53; /* DHCP Message Type */ 428 *e++ = 1; 429 *e++ = message_type; 430 431 *e++ = 57; /* Maximum DHCP Message Size */ 432 *e++ = 2; 433 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 8; 434 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff; 435 436 if (server_ip.s_addr) { 437 int tmp = ntohl(server_ip.s_addr); 438 439 *e++ = 54; /* ServerID */ 440 *e++ = 4; 441 *e++ = tmp >> 24; 442 *e++ = tmp >> 16; 443 *e++ = tmp >> 8; 444 *e++ = tmp & 0xff; 445 } 446 447 if (requested_ip.s_addr) { 448 int tmp = ntohl(requested_ip.s_addr); 449 450 *e++ = 50; /* Requested IP */ 451 *e++ = 4; 452 *e++ = tmp >> 24; 453 *e++ = tmp >> 16; 454 *e++ = tmp >> 8; 455 *e++ = tmp & 0xff; 456 } 457 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 458 hostname = getenv("hostname"); 459 if (hostname) { 460 int hostnamelen = strlen(hostname); 461 462 *e++ = 12; /* Hostname */ 463 *e++ = hostnamelen; 464 memcpy(e, hostname, hostnamelen); 465 e += hostnamelen; 466 } 467 #endif 468 469 #if defined(CONFIG_BOOTP_PXE) 470 clientarch = CONFIG_BOOTP_PXE_CLIENTARCH; 471 *e++ = 93; /* Client System Architecture */ 472 *e++ = 2; 473 *e++ = (clientarch >> 8) & 0xff; 474 *e++ = clientarch & 0xff; 475 476 *e++ = 94; /* Client Network Interface Identifier */ 477 *e++ = 3; 478 *e++ = 1; /* type field for UNDI */ 479 *e++ = 0; /* major revision */ 480 *e++ = 0; /* minor revision */ 481 482 uuid = getenv("pxeuuid"); 483 484 if (uuid) { 485 if (uuid_str_valid(uuid)) { 486 *e++ = 97; /* Client Machine Identifier */ 487 *e++ = 17; 488 *e++ = 0; /* type 0 - UUID */ 489 490 uuid_str_to_bin(uuid, e, UUID_STR_FORMAT_STD); 491 e += 16; 492 } else { 493 printf("Invalid pxeuuid: %s\n", uuid); 494 } 495 } 496 #endif 497 498 #ifdef CONFIG_BOOTP_VCI_STRING 499 put_vci(e, CONFIG_BOOTP_VCI_STRING); 500 #endif 501 502 #if defined(CONFIG_BOOTP_VENDOREX) 503 x = dhcp_vendorex_prep(e); 504 if (x) 505 return x - start; 506 #endif 507 508 *e++ = 55; /* Parameter Request List */ 509 cnt = e++; /* Pointer to count of requested items */ 510 *cnt = 0; 511 #if defined(CONFIG_BOOTP_SUBNETMASK) 512 *e++ = 1; /* Subnet Mask */ 513 *cnt += 1; 514 #endif 515 #if defined(CONFIG_BOOTP_TIMEOFFSET) 516 *e++ = 2; 517 *cnt += 1; 518 #endif 519 #if defined(CONFIG_BOOTP_GATEWAY) 520 *e++ = 3; /* Router Option */ 521 *cnt += 1; 522 #endif 523 #if defined(CONFIG_BOOTP_DNS) 524 *e++ = 6; /* DNS Server(s) */ 525 *cnt += 1; 526 #endif 527 #if defined(CONFIG_BOOTP_HOSTNAME) 528 *e++ = 12; /* Hostname */ 529 *cnt += 1; 530 #endif 531 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 532 *e++ = 13; /* Boot File Size */ 533 *cnt += 1; 534 #endif 535 #if defined(CONFIG_BOOTP_BOOTPATH) 536 *e++ = 17; /* Boot path */ 537 *cnt += 1; 538 #endif 539 #if defined(CONFIG_BOOTP_NISDOMAIN) 540 *e++ = 40; /* NIS Domain name request */ 541 *cnt += 1; 542 #endif 543 #if defined(CONFIG_BOOTP_NTPSERVER) 544 *e++ = 42; 545 *cnt += 1; 546 #endif 547 /* no options, so back up to avoid sending an empty request list */ 548 if (*cnt == 0) 549 e -= 2; 550 551 *e++ = 255; /* End of the list */ 552 553 /* Pad to minimal length */ 554 #ifdef CONFIG_DHCP_MIN_EXT_LEN 555 while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN) 556 *e++ = 0; 557 #endif 558 559 return e - start; 560 } 561 562 #else 563 /* 564 * Warning: no field size check - change CONFIG_BOOTP_* at your own risk! 565 */ 566 static int bootp_extended(u8 *e) 567 { 568 u8 *start = e; 569 570 *e++ = 99; /* RFC1048 Magic Cookie */ 571 *e++ = 130; 572 *e++ = 83; 573 *e++ = 99; 574 575 #if defined(CONFIG_CMD_DHCP) 576 *e++ = 53; /* DHCP Message Type */ 577 *e++ = 1; 578 *e++ = DHCP_DISCOVER; 579 580 *e++ = 57; /* Maximum DHCP Message Size */ 581 *e++ = 2; 582 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 16; 583 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff; 584 #endif 585 586 #if defined(CONFIG_BOOTP_VCI_STRING) || \ 587 (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING)) 588 #ifdef CONFIG_SPL_BUILD 589 put_vci(e, CONFIG_SPL_NET_VCI_STRING); 590 #else 591 put_vci(e, CONFIG_BOOTP_VCI_STRING); 592 #endif 593 #endif 594 595 #if defined(CONFIG_BOOTP_SUBNETMASK) 596 *e++ = 1; /* Subnet mask request */ 597 *e++ = 4; 598 e += 4; 599 #endif 600 601 #if defined(CONFIG_BOOTP_GATEWAY) 602 *e++ = 3; /* Default gateway request */ 603 *e++ = 4; 604 e += 4; 605 #endif 606 607 #if defined(CONFIG_BOOTP_DNS) 608 *e++ = 6; /* Domain Name Server */ 609 *e++ = 4; 610 e += 4; 611 #endif 612 613 #if defined(CONFIG_BOOTP_HOSTNAME) 614 *e++ = 12; /* Host name request */ 615 *e++ = 32; 616 e += 32; 617 #endif 618 619 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 620 *e++ = 13; /* Boot file size */ 621 *e++ = 2; 622 e += 2; 623 #endif 624 625 #if defined(CONFIG_BOOTP_BOOTPATH) 626 *e++ = 17; /* Boot path */ 627 *e++ = 32; 628 e += 32; 629 #endif 630 631 #if defined(CONFIG_BOOTP_NISDOMAIN) 632 *e++ = 40; /* NIS Domain name request */ 633 *e++ = 32; 634 e += 32; 635 #endif 636 #if defined(CONFIG_BOOTP_NTPSERVER) 637 *e++ = 42; 638 *e++ = 4; 639 e += 4; 640 #endif 641 642 *e++ = 255; /* End of the list */ 643 644 return e - start; 645 } 646 #endif 647 648 void BootpReset(void) 649 { 650 bootp_num_ids = 0; 651 BootpTry = 0; 652 bootp_start = get_timer(0); 653 bootp_timeout = 250; 654 } 655 656 void 657 BootpRequest(void) 658 { 659 uchar *pkt, *iphdr; 660 struct Bootp_t *bp; 661 int extlen, pktlen, iplen; 662 int eth_hdr_size; 663 #ifdef CONFIG_BOOTP_RANDOM_DELAY 664 ulong rand_ms; 665 #endif 666 ulong BootpID; 667 struct in_addr zero_ip; 668 struct in_addr bcast_ip; 669 670 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start"); 671 #if defined(CONFIG_CMD_DHCP) 672 dhcp_state = INIT; 673 #endif 674 675 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */ 676 if (BootpTry == 0) 677 srand_mac(); 678 679 if (BootpTry <= 2) /* Start with max 1024 * 1ms */ 680 rand_ms = rand() >> (22 - BootpTry); 681 else /* After 3rd BOOTP request max 8192 * 1ms */ 682 rand_ms = rand() >> 19; 683 684 printf("Random delay: %ld ms...\n", rand_ms); 685 mdelay(rand_ms); 686 687 #endif /* CONFIG_BOOTP_RANDOM_DELAY */ 688 689 printf("BOOTP broadcast %d\n", ++BootpTry); 690 pkt = NetTxPacket; 691 memset((void *)pkt, 0, PKTSIZE); 692 693 eth_hdr_size = NetSetEther(pkt, NetBcastAddr, PROT_IP); 694 pkt += eth_hdr_size; 695 696 /* 697 * Next line results in incorrect packet size being transmitted, 698 * resulting in errors in some DHCP servers, reporting missing bytes. 699 * Size must be set in packet header after extension length has been 700 * determined. 701 * C. Hallinan, DS4.COM, Inc. 702 */ 703 /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, 704 sizeof (struct Bootp_t)); */ 705 iphdr = pkt; /* We need this later for net_set_udp_header() */ 706 pkt += IP_UDP_HDR_SIZE; 707 708 bp = (struct Bootp_t *)pkt; 709 bp->bp_op = OP_BOOTREQUEST; 710 bp->bp_htype = HWT_ETHER; 711 bp->bp_hlen = HWL_ETHER; 712 bp->bp_hops = 0; 713 bp->bp_secs = htons(get_timer(0) / 1000); 714 zero_ip.s_addr = 0; 715 net_write_ip(&bp->bp_ciaddr, zero_ip); 716 net_write_ip(&bp->bp_yiaddr, zero_ip); 717 net_write_ip(&bp->bp_siaddr, zero_ip); 718 net_write_ip(&bp->bp_giaddr, zero_ip); 719 memcpy(bp->bp_chaddr, NetOurEther, 6); 720 copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file)); 721 722 /* Request additional information from the BOOTP/DHCP server */ 723 #if defined(CONFIG_CMD_DHCP) 724 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_DISCOVER, zero_ip, 725 zero_ip); 726 #else 727 extlen = bootp_extended((u8 *)bp->bp_vend); 728 #endif 729 730 /* 731 * Bootp ID is the lower 4 bytes of our ethernet address 732 * plus the current time in ms. 733 */ 734 BootpID = ((ulong)NetOurEther[2] << 24) 735 | ((ulong)NetOurEther[3] << 16) 736 | ((ulong)NetOurEther[4] << 8) 737 | (ulong)NetOurEther[5]; 738 BootpID += get_timer(0); 739 BootpID = htonl(BootpID); 740 bootp_add_id(BootpID); 741 NetCopyLong(&bp->bp_id, &BootpID); 742 743 /* 744 * Calculate proper packet lengths taking into account the 745 * variable size of the options field 746 */ 747 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen; 748 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen; 749 bcast_ip.s_addr = 0xFFFFFFFFL; 750 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen); 751 NetSetTimeout(bootp_timeout, BootpTimeout); 752 753 #if defined(CONFIG_CMD_DHCP) 754 dhcp_state = SELECTING; 755 net_set_udp_handler(dhcp_handler); 756 #else 757 net_set_udp_handler(bootp_handler); 758 #endif 759 NetSendPacket(NetTxPacket, pktlen); 760 } 761 762 #if defined(CONFIG_CMD_DHCP) 763 static void DhcpOptionsProcess(uchar *popt, struct Bootp_t *bp) 764 { 765 uchar *end = popt + BOOTP_HDR_SIZE; 766 int oplen, size; 767 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 768 int *to_ptr; 769 #endif 770 771 while (popt < end && *popt != 0xff) { 772 oplen = *(popt + 1); 773 switch (*popt) { 774 case 1: 775 net_copy_ip(&net_netmask, (popt + 2)); 776 break; 777 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 778 case 2: /* Time offset */ 779 to_ptr = &NetTimeOffset; 780 NetCopyLong((ulong *)to_ptr, (ulong *)(popt + 2)); 781 NetTimeOffset = ntohl(NetTimeOffset); 782 break; 783 #endif 784 case 3: 785 net_copy_ip(&net_gateway, (popt + 2)); 786 break; 787 case 6: 788 net_copy_ip(&net_dns_server, (popt + 2)); 789 #if defined(CONFIG_BOOTP_DNS2) 790 if (*(popt + 1) > 4) 791 net_copy_ip(&net_dns_server2, (popt + 2 + 4)); 792 #endif 793 break; 794 case 12: 795 size = truncate_sz("Host Name", 796 sizeof(NetOurHostName), oplen); 797 memcpy(&NetOurHostName, popt + 2, size); 798 NetOurHostName[size] = 0; 799 break; 800 case 15: /* Ignore Domain Name Option */ 801 break; 802 case 17: 803 size = truncate_sz("Root Path", 804 sizeof(NetOurRootPath), oplen); 805 memcpy(&NetOurRootPath, popt + 2, size); 806 NetOurRootPath[size] = 0; 807 break; 808 case 28: /* Ignore Broadcast Address Option */ 809 break; 810 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 811 case 42: /* NTP server IP */ 812 net_copy_ip(&net_ntp_server, (popt + 2)); 813 break; 814 #endif 815 case 51: 816 NetCopyLong(&dhcp_leasetime, (ulong *) (popt + 2)); 817 break; 818 case 53: /* Ignore Message Type Option */ 819 break; 820 case 54: 821 net_copy_ip(&dhcp_server_ip, (popt + 2)); 822 break; 823 case 58: /* Ignore Renewal Time Option */ 824 break; 825 case 59: /* Ignore Rebinding Time Option */ 826 break; 827 case 66: /* Ignore TFTP server name */ 828 break; 829 case 67: /* vendor opt bootfile */ 830 /* 831 * I can't use dhcp_vendorex_proc here because I need 832 * to write into the bootp packet - even then I had to 833 * pass the bootp packet pointer into here as the 834 * second arg 835 */ 836 size = truncate_sz("Opt Boot File", 837 sizeof(bp->bp_file), 838 oplen); 839 if (bp->bp_file[0] == '\0' && size > 0) { 840 /* 841 * only use vendor boot file if we didn't 842 * receive a boot file in the main non-vendor 843 * part of the packet - god only knows why 844 * some vendors chose not to use this perfectly 845 * good spot to store the boot file (join on 846 * Tru64 Unix) it seems mind bogglingly crazy 847 * to me 848 */ 849 printf("*** WARNING: using vendor " 850 "optional boot file\n"); 851 memcpy(bp->bp_file, popt + 2, size); 852 bp->bp_file[size] = '\0'; 853 } 854 break; 855 default: 856 #if defined(CONFIG_BOOTP_VENDOREX) 857 if (dhcp_vendorex_proc(popt)) 858 break; 859 #endif 860 printf("*** Unhandled DHCP Option in OFFER/ACK:" 861 " %d\n", *popt); 862 break; 863 } 864 popt += oplen + 2; /* Process next option */ 865 } 866 } 867 868 static int DhcpMessageType(unsigned char *popt) 869 { 870 if (NetReadLong((ulong *)popt) != htonl(BOOTP_VENDOR_MAGIC)) 871 return -1; 872 873 popt += 4; 874 while (*popt != 0xff) { 875 if (*popt == 53) /* DHCP Message Type */ 876 return *(popt + 2); 877 popt += *(popt + 1) + 2; /* Scan through all options */ 878 } 879 return -1; 880 } 881 882 static void DhcpSendRequestPkt(struct Bootp_t *bp_offer) 883 { 884 uchar *pkt, *iphdr; 885 struct Bootp_t *bp; 886 int pktlen, iplen, extlen; 887 int eth_hdr_size; 888 struct in_addr offered_ip; 889 struct in_addr zero_ip; 890 struct in_addr bcast_ip; 891 892 debug("DhcpSendRequestPkt: Sending DHCPREQUEST\n"); 893 pkt = NetTxPacket; 894 memset((void *)pkt, 0, PKTSIZE); 895 896 eth_hdr_size = NetSetEther(pkt, NetBcastAddr, PROT_IP); 897 pkt += eth_hdr_size; 898 899 iphdr = pkt; /* We'll need this later to set proper pkt size */ 900 pkt += IP_UDP_HDR_SIZE; 901 902 bp = (struct Bootp_t *)pkt; 903 bp->bp_op = OP_BOOTREQUEST; 904 bp->bp_htype = HWT_ETHER; 905 bp->bp_hlen = HWL_ETHER; 906 bp->bp_hops = 0; 907 bp->bp_secs = htons(get_timer(0) / 1000); 908 /* Do not set the client IP, your IP, or server IP yet, since it 909 * hasn't been ACK'ed by the server yet */ 910 911 /* 912 * RFC3046 requires Relay Agents to discard packets with 913 * nonzero and offered giaddr 914 */ 915 zero_ip.s_addr = 0; 916 net_write_ip(&bp->bp_giaddr, zero_ip); 917 918 memcpy(bp->bp_chaddr, NetOurEther, 6); 919 920 /* 921 * ID is the id of the OFFER packet 922 */ 923 924 NetCopyLong(&bp->bp_id, &bp_offer->bp_id); 925 926 /* 927 * Copy options from OFFER packet if present 928 */ 929 930 /* Copy offered IP into the parameters request list */ 931 net_copy_ip(&offered_ip, &bp_offer->bp_yiaddr); 932 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST, 933 dhcp_server_ip, offered_ip); 934 935 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen; 936 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen; 937 bcast_ip.s_addr = 0xFFFFFFFFL; 938 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen); 939 940 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY 941 udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY); 942 #endif /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */ 943 debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen); 944 NetSendPacket(NetTxPacket, pktlen); 945 } 946 947 /* 948 * Handle DHCP received packets. 949 */ 950 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip, 951 unsigned src, unsigned len) 952 { 953 struct Bootp_t *bp = (struct Bootp_t *)pkt; 954 955 debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n", 956 src, dest, len, dhcp_state); 957 958 /* Filter out pkts we don't want */ 959 if (BootpCheckPkt(pkt, dest, src, len)) 960 return; 961 962 debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state:" 963 " %d\n", src, dest, len, dhcp_state); 964 965 switch (dhcp_state) { 966 case SELECTING: 967 /* 968 * Wait an appropriate time for any potential DHCPOFFER packets 969 * to arrive. Then select one, and generate DHCPREQUEST 970 * response. If filename is in format we recognize, assume it 971 * is a valid OFFER from a server we want. 972 */ 973 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file); 974 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 975 if (strncmp(bp->bp_file, 976 CONFIG_SYS_BOOTFILE_PREFIX, 977 strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) { 978 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 979 980 debug("TRANSITIONING TO REQUESTING STATE\n"); 981 dhcp_state = REQUESTING; 982 983 if (NetReadLong((ulong *)&bp->bp_vend[0]) == 984 htonl(BOOTP_VENDOR_MAGIC)) 985 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp); 986 987 NetSetTimeout(5000, BootpTimeout); 988 DhcpSendRequestPkt(bp); 989 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 990 } 991 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 992 993 return; 994 break; 995 case REQUESTING: 996 debug("DHCP State: REQUESTING\n"); 997 998 if (DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK) { 999 if (NetReadLong((ulong *)&bp->bp_vend[0]) == 1000 htonl(BOOTP_VENDOR_MAGIC)) 1001 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp); 1002 /* Store net params from reply */ 1003 BootpCopyNetParams(bp); 1004 dhcp_state = BOUND; 1005 printf("DHCP client bound to address %pI4 (%lu ms)\n", 1006 &net_ip, get_timer(bootp_start)); 1007 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, 1008 "bootp_stop"); 1009 1010 net_auto_load(); 1011 return; 1012 } 1013 break; 1014 case BOUND: 1015 /* DHCP client bound to address */ 1016 break; 1017 default: 1018 puts("DHCP: INVALID STATE\n"); 1019 break; 1020 } 1021 1022 } 1023 1024 void DhcpRequest(void) 1025 { 1026 BootpRequest(); 1027 } 1028 #endif /* CONFIG_CMD_DHCP */ 1029