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