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 21 #define BOOTP_VENDOR_MAGIC 0x63825363 /* RFC1048 Magic Cookie */ 22 23 #define TIMEOUT 5000UL /* Milliseconds before trying BOOTP again */ 24 #ifndef CONFIG_NET_RETRY_COUNT 25 # define TIMEOUT_COUNT 5 /* # of timeouts before giving up */ 26 #else 27 # define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT) 28 #endif 29 30 #define PORT_BOOTPS 67 /* BOOTP server UDP port */ 31 #define PORT_BOOTPC 68 /* BOOTP client UDP port */ 32 33 #ifndef CONFIG_DHCP_MIN_EXT_LEN /* minimal length of extension list */ 34 #define CONFIG_DHCP_MIN_EXT_LEN 64 35 #endif 36 37 ulong BootpID; 38 int BootpTry; 39 #ifdef CONFIG_BOOTP_RANDOM_DELAY 40 ulong seed1, seed2; 41 #endif 42 43 #if defined(CONFIG_CMD_DHCP) 44 dhcp_state_t dhcp_state = INIT; 45 unsigned long dhcp_leasetime = 0; 46 IPaddr_t NetDHCPServerIP = 0; 47 static void DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len); 48 49 /* For Debug */ 50 #if 0 51 static char *dhcpmsg2str(int type) 52 { 53 switch (type) { 54 case 1: return "DHCPDISCOVER"; break; 55 case 2: return "DHCPOFFER"; break; 56 case 3: return "DHCPREQUEST"; break; 57 case 4: return "DHCPDECLINE"; break; 58 case 5: return "DHCPACK"; break; 59 case 6: return "DHCPNACK"; break; 60 case 7: return "DHCPRELEASE"; break; 61 default: return "UNKNOWN/INVALID MSG TYPE"; break; 62 } 63 } 64 #endif 65 66 #if defined(CONFIG_BOOTP_VENDOREX) 67 extern u8 *dhcp_vendorex_prep (u8 *e); /*rtn new e after add own opts. */ 68 extern u8 *dhcp_vendorex_proc (u8 *e); /*rtn next e if mine,else NULL */ 69 #endif 70 71 #endif 72 73 static int BootpCheckPkt(uchar *pkt, unsigned dest, unsigned src, unsigned len) 74 { 75 Bootp_t *bp = (Bootp_t *) pkt; 76 int retval = 0; 77 78 if (dest != PORT_BOOTPC || src != PORT_BOOTPS) 79 retval = -1; 80 else if (len < sizeof (Bootp_t) - OPT_SIZE) 81 retval = -2; 82 else if (bp->bp_op != OP_BOOTREQUEST && 83 bp->bp_op != OP_BOOTREPLY && 84 bp->bp_op != DHCP_OFFER && 85 bp->bp_op != DHCP_ACK && 86 bp->bp_op != DHCP_NAK ) { 87 retval = -3; 88 } 89 else if (bp->bp_htype != HWT_ETHER) 90 retval = -4; 91 else if (bp->bp_hlen != HWL_ETHER) 92 retval = -5; 93 else if (NetReadLong((ulong*)&bp->bp_id) != BootpID) { 94 retval = -6; 95 } 96 97 debug("Filtering pkt = %d\n", retval); 98 99 return retval; 100 } 101 102 /* 103 * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet 104 */ 105 static void BootpCopyNetParams(Bootp_t *bp) 106 { 107 IPaddr_t tmp_ip; 108 109 NetCopyIP(&NetOurIP, &bp->bp_yiaddr); 110 #if !defined(CONFIG_BOOTP_SERVERIP) 111 NetCopyIP(&tmp_ip, &bp->bp_siaddr); 112 if (tmp_ip != 0) 113 NetCopyIP(&NetServerIP, &bp->bp_siaddr); 114 memcpy (NetServerEther, ((Ethernet_t *)NetRxPacket)->et_src, 6); 115 #endif 116 if (strlen(bp->bp_file) > 0) 117 copy_filename (BootFile, bp->bp_file, sizeof(BootFile)); 118 119 debug("Bootfile: %s\n", BootFile); 120 121 /* Propagate to environment: 122 * don't delete exising entry when BOOTP / DHCP reply does 123 * not contain a new value 124 */ 125 if (*BootFile) { 126 setenv ("bootfile", BootFile); 127 } 128 } 129 130 static int truncate_sz (const char *name, int maxlen, int curlen) 131 { 132 if (curlen >= maxlen) { 133 printf("*** WARNING: %s is too long (%d - max: %d) - truncated\n", 134 name, curlen, maxlen); 135 curlen = maxlen - 1; 136 } 137 return (curlen); 138 } 139 140 #if !defined(CONFIG_CMD_DHCP) 141 142 static void BootpVendorFieldProcess (u8 * ext) 143 { 144 int size = *(ext + 1); 145 146 debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext, 147 *(ext + 1)); 148 149 NetBootFileSize = 0; 150 151 switch (*ext) { 152 /* Fixed length fields */ 153 case 1: /* Subnet mask */ 154 if (NetOurSubnetMask == 0) 155 NetCopyIP (&NetOurSubnetMask, (IPaddr_t *) (ext + 2)); 156 break; 157 case 2: /* Time offset - Not yet supported */ 158 break; 159 /* Variable length fields */ 160 case 3: /* Gateways list */ 161 if (NetOurGatewayIP == 0) { 162 NetCopyIP (&NetOurGatewayIP, (IPaddr_t *) (ext + 2)); 163 } 164 break; 165 case 4: /* Time server - Not yet supported */ 166 break; 167 case 5: /* IEN-116 name server - Not yet supported */ 168 break; 169 case 6: 170 if (NetOurDNSIP == 0) { 171 NetCopyIP (&NetOurDNSIP, (IPaddr_t *) (ext + 2)); 172 } 173 #if defined(CONFIG_BOOTP_DNS2) 174 if ((NetOurDNS2IP == 0) && (size > 4)) { 175 NetCopyIP (&NetOurDNS2IP, (IPaddr_t *) (ext + 2 + 4)); 176 } 177 #endif 178 break; 179 case 7: /* Log server - Not yet supported */ 180 break; 181 case 8: /* Cookie/Quote server - Not yet supported */ 182 break; 183 case 9: /* LPR server - Not yet supported */ 184 break; 185 case 10: /* Impress server - Not yet supported */ 186 break; 187 case 11: /* RPL server - Not yet supported */ 188 break; 189 case 12: /* Host name */ 190 if (NetOurHostName[0] == 0) { 191 size = truncate_sz ("Host Name", sizeof (NetOurHostName), size); 192 memcpy (&NetOurHostName, ext + 2, size); 193 NetOurHostName[size] = 0; 194 } 195 break; 196 case 13: /* Boot file size */ 197 if (size == 2) 198 NetBootFileSize = ntohs (*(ushort *) (ext + 2)); 199 else if (size == 4) 200 NetBootFileSize = ntohl (*(ulong *) (ext + 2)); 201 break; 202 case 14: /* Merit dump file - Not yet supported */ 203 break; 204 case 15: /* Domain name - Not yet supported */ 205 break; 206 case 16: /* Swap server - Not yet supported */ 207 break; 208 case 17: /* Root path */ 209 if (NetOurRootPath[0] == 0) { 210 size = truncate_sz ("Root Path", sizeof (NetOurRootPath), size); 211 memcpy (&NetOurRootPath, ext + 2, size); 212 NetOurRootPath[size] = 0; 213 } 214 break; 215 case 18: /* Extension path - Not yet supported */ 216 /* 217 * This can be used to send the information of the 218 * vendor area in another file that the client can 219 * access via TFTP. 220 */ 221 break; 222 /* IP host layer fields */ 223 case 40: /* NIS Domain name */ 224 if (NetOurNISDomain[0] == 0) { 225 size = truncate_sz ("NIS Domain Name", sizeof (NetOurNISDomain), size); 226 memcpy (&NetOurNISDomain, ext + 2, size); 227 NetOurNISDomain[size] = 0; 228 } 229 break; 230 /* Application layer fields */ 231 case 43: /* Vendor specific info - Not yet supported */ 232 /* 233 * Binary information to exchange specific 234 * product information. 235 */ 236 break; 237 /* Reserved (custom) fields (128..254) */ 238 } 239 } 240 241 static void BootpVendorProcess (u8 * ext, int size) 242 { 243 u8 *end = ext + size; 244 245 debug("[BOOTP] Checking extension (%d bytes)...\n", size); 246 247 while ((ext < end) && (*ext != 0xff)) { 248 if (*ext == 0) { 249 ext++; 250 } else { 251 u8 *opt = ext; 252 253 ext += ext[1] + 2; 254 if (ext <= end) 255 BootpVendorFieldProcess (opt); 256 } 257 } 258 259 debug("[BOOTP] Received fields: \n"); 260 if (NetOurSubnetMask) 261 debug("NetOurSubnetMask : %pI4\n", &NetOurSubnetMask); 262 263 if (NetOurGatewayIP) 264 debug("NetOurGatewayIP : %pI4", &NetOurGatewayIP); 265 266 if (NetBootFileSize) 267 debug("NetBootFileSize : %d\n", NetBootFileSize); 268 269 if (NetOurHostName[0]) 270 debug("NetOurHostName : %s\n", NetOurHostName); 271 272 if (NetOurRootPath[0]) 273 debug("NetOurRootPath : %s\n", NetOurRootPath); 274 275 if (NetOurNISDomain[0]) 276 debug("NetOurNISDomain : %s\n", NetOurNISDomain); 277 278 if (NetBootFileSize) 279 debug("NetBootFileSize: %d\n", NetBootFileSize); 280 } 281 /* 282 * Handle a BOOTP received packet. 283 */ 284 static void 285 BootpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len) 286 { 287 Bootp_t *bp; 288 char *s; 289 290 debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n", 291 src, dest, len, sizeof (Bootp_t)); 292 293 bp = (Bootp_t *)pkt; 294 295 if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */ 296 return; 297 298 /* 299 * Got a good BOOTP reply. Copy the data into our variables. 300 */ 301 #ifdef CONFIG_STATUS_LED 302 status_led_set (STATUS_LED_BOOT, STATUS_LED_OFF); 303 #endif 304 305 BootpCopyNetParams(bp); /* Store net parameters from reply */ 306 307 /* Retrieve extended information (we must parse the vendor area) */ 308 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 309 BootpVendorProcess((uchar *)&bp->bp_vend[4], len); 310 311 NetSetTimeout(0, (thand_f *)0); 312 313 debug("Got good BOOTP\n"); 314 315 if ((s = getenv("autoload")) != NULL) { 316 if (*s == 'n') { 317 /* 318 * Just use BOOTP to configure system; 319 * Do not use TFTP to load the bootfile. 320 */ 321 NetState = NETLOOP_SUCCESS; 322 return; 323 #if defined(CONFIG_CMD_NFS) 324 } else if (strcmp(s, "NFS") == 0) { 325 /* 326 * Use NFS to load the bootfile. 327 */ 328 NfsStart(); 329 return; 330 #endif 331 } 332 } 333 334 TftpStart(); 335 } 336 #endif 337 338 /* 339 * Timeout on BOOTP/DHCP request. 340 */ 341 static void 342 BootpTimeout(void) 343 { 344 if (BootpTry >= TIMEOUT_COUNT) { 345 puts ("\nRetry count exceeded; starting again\n"); 346 NetStartAgain (); 347 } else { 348 NetSetTimeout (TIMEOUT, BootpTimeout); 349 BootpRequest (); 350 } 351 } 352 353 /* 354 * Initialize BOOTP extension fields in the request. 355 */ 356 #if defined(CONFIG_CMD_DHCP) 357 static int DhcpExtended (u8 * e, int message_type, IPaddr_t ServerID, IPaddr_t RequestedIP) 358 { 359 u8 *start = e; 360 u8 *cnt; 361 362 #if defined(CONFIG_BOOTP_VENDOREX) 363 u8 *x; 364 #endif 365 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 366 char *hostname; 367 #endif 368 369 *e++ = 99; /* RFC1048 Magic Cookie */ 370 *e++ = 130; 371 *e++ = 83; 372 *e++ = 99; 373 374 *e++ = 53; /* DHCP Message Type */ 375 *e++ = 1; 376 *e++ = message_type; 377 378 *e++ = 57; /* Maximum DHCP Message Size */ 379 *e++ = 2; 380 *e++ = (576 - 312 + OPT_SIZE) >> 8; 381 *e++ = (576 - 312 + OPT_SIZE) & 0xff; 382 383 if (ServerID) { 384 int tmp = ntohl (ServerID); 385 386 *e++ = 54; /* ServerID */ 387 *e++ = 4; 388 *e++ = tmp >> 24; 389 *e++ = tmp >> 16; 390 *e++ = tmp >> 8; 391 *e++ = tmp & 0xff; 392 } 393 394 if (RequestedIP) { 395 int tmp = ntohl (RequestedIP); 396 397 *e++ = 50; /* Requested IP */ 398 *e++ = 4; 399 *e++ = tmp >> 24; 400 *e++ = tmp >> 16; 401 *e++ = tmp >> 8; 402 *e++ = tmp & 0xff; 403 } 404 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 405 if ((hostname = getenv ("hostname"))) { 406 int hostnamelen = strlen (hostname); 407 408 *e++ = 12; /* Hostname */ 409 *e++ = hostnamelen; 410 memcpy (e, hostname, hostnamelen); 411 e += hostnamelen; 412 } 413 #endif 414 415 #if defined(CONFIG_BOOTP_VENDOREX) 416 if ((x = dhcp_vendorex_prep (e))) 417 return x - start; 418 #endif 419 420 *e++ = 55; /* Parameter Request List */ 421 cnt = e++; /* Pointer to count of requested items */ 422 *cnt = 0; 423 #if defined(CONFIG_BOOTP_SUBNETMASK) 424 *e++ = 1; /* Subnet Mask */ 425 *cnt += 1; 426 #endif 427 #if defined(CONFIG_BOOTP_TIMEOFFSET) 428 *e++ = 2; 429 *cnt += 1; 430 #endif 431 #if defined(CONFIG_BOOTP_GATEWAY) 432 *e++ = 3; /* Router Option */ 433 *cnt += 1; 434 #endif 435 #if defined(CONFIG_BOOTP_DNS) 436 *e++ = 6; /* DNS Server(s) */ 437 *cnt += 1; 438 #endif 439 #if defined(CONFIG_BOOTP_HOSTNAME) 440 *e++ = 12; /* Hostname */ 441 *cnt += 1; 442 #endif 443 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 444 *e++ = 13; /* Boot File Size */ 445 *cnt += 1; 446 #endif 447 #if defined(CONFIG_BOOTP_BOOTPATH) 448 *e++ = 17; /* Boot path */ 449 *cnt += 1; 450 #endif 451 #if defined(CONFIG_BOOTP_NISDOMAIN) 452 *e++ = 40; /* NIS Domain name request */ 453 *cnt += 1; 454 #endif 455 #if defined(CONFIG_BOOTP_NTPSERVER) 456 *e++ = 42; 457 *cnt += 1; 458 #endif 459 *e++ = 255; /* End of the list */ 460 461 /* Pad to minimal length */ 462 #ifdef CONFIG_DHCP_MIN_EXT_LEN 463 while ((e - start) <= CONFIG_DHCP_MIN_EXT_LEN) 464 *e++ = 0; 465 #endif 466 467 return e - start; 468 } 469 470 #else 471 /* 472 * Warning: no field size check - change CONFIG_BOOTP_* at your own risk! 473 */ 474 static int BootpExtended (u8 * e) 475 { 476 u8 *start = e; 477 478 *e++ = 99; /* RFC1048 Magic Cookie */ 479 *e++ = 130; 480 *e++ = 83; 481 *e++ = 99; 482 483 #if defined(CONFIG_CMD_DHCP) 484 *e++ = 53; /* DHCP Message Type */ 485 *e++ = 1; 486 *e++ = DHCP_DISCOVER; 487 488 *e++ = 57; /* Maximum DHCP Message Size */ 489 *e++ = 2; 490 *e++ = (576 - 312 + OPT_SIZE) >> 16; 491 *e++ = (576 - 312 + OPT_SIZE) & 0xff; 492 #endif 493 494 #if defined(CONFIG_BOOTP_SUBNETMASK) 495 *e++ = 1; /* Subnet mask request */ 496 *e++ = 4; 497 e += 4; 498 #endif 499 500 #if defined(CONFIG_BOOTP_GATEWAY) 501 *e++ = 3; /* Default gateway request */ 502 *e++ = 4; 503 e += 4; 504 #endif 505 506 #if defined(CONFIG_BOOTP_DNS) 507 *e++ = 6; /* Domain Name Server */ 508 *e++ = 4; 509 e += 4; 510 #endif 511 512 #if defined(CONFIG_BOOTP_HOSTNAME) 513 *e++ = 12; /* Host name request */ 514 *e++ = 32; 515 e += 32; 516 #endif 517 518 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 519 *e++ = 13; /* Boot file size */ 520 *e++ = 2; 521 e += 2; 522 #endif 523 524 #if defined(CONFIG_BOOTP_BOOTPATH) 525 *e++ = 17; /* Boot path */ 526 *e++ = 32; 527 e += 32; 528 #endif 529 530 #if defined(CONFIG_BOOTP_NISDOMAIN) 531 *e++ = 40; /* NIS Domain name request */ 532 *e++ = 32; 533 e += 32; 534 #endif 535 536 *e++ = 255; /* End of the list */ 537 538 return e - start; 539 } 540 #endif 541 542 void 543 BootpRequest (void) 544 { 545 volatile uchar *pkt, *iphdr; 546 Bootp_t *bp; 547 int ext_len, pktlen, iplen; 548 549 #if defined(CONFIG_CMD_DHCP) 550 dhcp_state = INIT; 551 #endif 552 553 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */ 554 unsigned char bi_enetaddr[6]; 555 int reg; 556 ulong tst1, tst2, sum, m_mask, m_value = 0; 557 558 if (BootpTry ==0) { 559 /* get our mac */ 560 eth_getenv_enetaddr("ethaddr", bi_enetaddr); 561 562 debug("BootpRequest => Our Mac: "); 563 for (reg=0; reg<6; reg++) 564 debug("%x%c", bi_enetaddr[reg], reg==5 ? '\n' : ':'); 565 566 /* Mac-Manipulation 2 get seed1 */ 567 tst1=0; 568 tst2=0; 569 for (reg=2; reg<6; reg++) { 570 tst1 = tst1 << 8; 571 tst1 = tst1 | bi_enetaddr[reg]; 572 } 573 for (reg=0; reg<2; reg++) { 574 tst2 = tst2 | bi_enetaddr[reg]; 575 tst2 = tst2 << 8; 576 } 577 578 seed1 = tst1^tst2; 579 580 /* Mirror seed1*/ 581 m_mask=0x1; 582 for (reg=1;reg<=32;reg++) { 583 m_value |= (m_mask & seed1); 584 seed1 = seed1 >> 1; 585 m_value = m_value << 1; 586 } 587 seed1 = m_value; 588 seed2 = 0xB78D0945; 589 } 590 591 /* Random Number Generator */ 592 593 for (reg=0;reg<=0;reg++) { 594 sum = seed1 + seed2; 595 if (sum < seed1 || sum < seed2) 596 sum++; 597 seed2 = seed1; 598 seed1 = sum; 599 600 if (BootpTry<=2) { /* Start with max 1024 * 1ms */ 601 sum = sum >> (22-BootpTry); 602 } else { /*After 3rd BOOTP request max 8192 * 1ms */ 603 sum = sum >> 19; 604 } 605 } 606 607 printf ("Random delay: %ld ms...\n", sum); 608 for (reg=0; reg <sum; reg++) { 609 udelay(1000); /*Wait 1ms*/ 610 } 611 #endif /* CONFIG_BOOTP_RANDOM_DELAY */ 612 613 printf("BOOTP broadcast %d\n", ++BootpTry); 614 pkt = NetTxPacket; 615 memset ((void*)pkt, 0, PKTSIZE); 616 617 pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP); 618 619 /* 620 * Next line results in incorrect packet size being transmitted, resulting 621 * in errors in some DHCP servers, reporting missing bytes. Size must be 622 * set in packet header after extension length has been determined. 623 * C. Hallinan, DS4.COM, Inc. 624 */ 625 /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */ 626 iphdr = pkt; /* We need this later for NetSetIP() */ 627 pkt += IP_HDR_SIZE; 628 629 bp = (Bootp_t *)pkt; 630 bp->bp_op = OP_BOOTREQUEST; 631 bp->bp_htype = HWT_ETHER; 632 bp->bp_hlen = HWL_ETHER; 633 bp->bp_hops = 0; 634 bp->bp_secs = htons(get_timer(0) / 1000); 635 NetWriteIP(&bp->bp_ciaddr, 0); 636 NetWriteIP(&bp->bp_yiaddr, 0); 637 NetWriteIP(&bp->bp_siaddr, 0); 638 NetWriteIP(&bp->bp_giaddr, 0); 639 memcpy (bp->bp_chaddr, NetOurEther, 6); 640 copy_filename (bp->bp_file, BootFile, sizeof(bp->bp_file)); 641 642 /* Request additional information from the BOOTP/DHCP server */ 643 #if defined(CONFIG_CMD_DHCP) 644 ext_len = DhcpExtended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0); 645 #else 646 ext_len = BootpExtended((u8 *)bp->bp_vend); 647 #endif 648 649 /* 650 * Bootp ID is the lower 4 bytes of our ethernet address 651 * plus the current time in ms. 652 */ 653 BootpID = ((ulong)NetOurEther[2] << 24) 654 | ((ulong)NetOurEther[3] << 16) 655 | ((ulong)NetOurEther[4] << 8) 656 | (ulong)NetOurEther[5]; 657 BootpID += get_timer(0); 658 BootpID = htonl(BootpID); 659 NetCopyLong(&bp->bp_id, &BootpID); 660 661 /* 662 * Calculate proper packet lengths taking into account the 663 * variable size of the options field 664 */ 665 pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len; 666 iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len; 667 NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); 668 NetSetTimeout(SELECT_TIMEOUT, BootpTimeout); 669 670 #if defined(CONFIG_CMD_DHCP) 671 dhcp_state = SELECTING; 672 NetSetHandler(DhcpHandler); 673 #else 674 NetSetHandler(BootpHandler); 675 #endif 676 NetSendPacket(NetTxPacket, pktlen); 677 } 678 679 #if defined(CONFIG_CMD_DHCP) 680 static void DhcpOptionsProcess (uchar * popt, Bootp_t *bp) 681 { 682 uchar *end = popt + BOOTP_HDR_SIZE; 683 int oplen, size; 684 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 685 int *to_ptr; 686 #endif 687 688 while (popt < end && *popt != 0xff) { 689 oplen = *(popt + 1); 690 switch (*popt) { 691 case 1: 692 NetCopyIP (&NetOurSubnetMask, (popt + 2)); 693 break; 694 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 695 case 2: /* Time offset */ 696 to_ptr = &NetTimeOffset; 697 NetCopyLong ((ulong *)to_ptr, (ulong *)(popt + 2)); 698 NetTimeOffset = ntohl (NetTimeOffset); 699 break; 700 #endif 701 case 3: 702 NetCopyIP (&NetOurGatewayIP, (popt + 2)); 703 break; 704 case 6: 705 NetCopyIP (&NetOurDNSIP, (popt + 2)); 706 #if defined(CONFIG_BOOTP_DNS2) 707 if (*(popt + 1) > 4) { 708 NetCopyIP (&NetOurDNS2IP, (popt + 2 + 4)); 709 } 710 #endif 711 break; 712 case 12: 713 size = truncate_sz ("Host Name", sizeof (NetOurHostName), oplen); 714 memcpy (&NetOurHostName, popt + 2, size); 715 NetOurHostName[size] = 0; 716 break; 717 case 15: /* Ignore Domain Name Option */ 718 break; 719 case 17: 720 size = truncate_sz ("Root Path", sizeof (NetOurRootPath), oplen); 721 memcpy (&NetOurRootPath, popt + 2, size); 722 NetOurRootPath[size] = 0; 723 break; 724 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 725 case 42: /* NTP server IP */ 726 NetCopyIP (&NetNtpServerIP, (popt + 2)); 727 break; 728 #endif 729 case 51: 730 NetCopyLong (&dhcp_leasetime, (ulong *) (popt + 2)); 731 break; 732 case 53: /* Ignore Message Type Option */ 733 break; 734 case 54: 735 NetCopyIP (&NetDHCPServerIP, (popt + 2)); 736 break; 737 case 58: /* Ignore Renewal Time Option */ 738 break; 739 case 59: /* Ignore Rebinding Time Option */ 740 break; 741 case 66: /* Ignore TFTP server name */ 742 break; 743 case 67: /* vendor opt bootfile */ 744 /* 745 * I can't use dhcp_vendorex_proc here because I need 746 * to write into the bootp packet - even then I had to 747 * pass the bootp packet pointer into here as the 748 * second arg 749 */ 750 size = truncate_sz ("Opt Boot File", 751 sizeof(bp->bp_file), 752 oplen); 753 if (bp->bp_file[0] == '\0' && size > 0) { 754 /* 755 * only use vendor boot file if we didn't 756 * receive a boot file in the main non-vendor 757 * part of the packet - god only knows why 758 * some vendors chose not to use this perfectly 759 * good spot to store the boot file (join on 760 * Tru64 Unix) it seems mind bogglingly crazy 761 * to me 762 */ 763 printf("*** WARNING: using vendor " 764 "optional boot file\n"); 765 memcpy(bp->bp_file, popt + 2, size); 766 bp->bp_file[size] = '\0'; 767 } 768 break; 769 default: 770 #if defined(CONFIG_BOOTP_VENDOREX) 771 if (dhcp_vendorex_proc (popt)) 772 break; 773 #endif 774 printf ("*** Unhandled DHCP Option in OFFER/ACK: %d\n", *popt); 775 break; 776 } 777 popt += oplen + 2; /* Process next option */ 778 } 779 } 780 781 static int DhcpMessageType(unsigned char *popt) 782 { 783 if (NetReadLong((ulong*)popt) != htonl(BOOTP_VENDOR_MAGIC)) 784 return -1; 785 786 popt += 4; 787 while ( *popt != 0xff ) { 788 if ( *popt == 53 ) /* DHCP Message Type */ 789 return *(popt + 2); 790 popt += *(popt + 1) + 2; /* Scan through all options */ 791 } 792 return -1; 793 } 794 795 static void DhcpSendRequestPkt(Bootp_t *bp_offer) 796 { 797 volatile uchar *pkt, *iphdr; 798 Bootp_t *bp; 799 int pktlen, iplen, extlen; 800 IPaddr_t OfferedIP; 801 802 debug("DhcpSendRequestPkt: Sending DHCPREQUEST\n"); 803 pkt = NetTxPacket; 804 memset ((void*)pkt, 0, PKTSIZE); 805 806 pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP); 807 808 iphdr = pkt; /* We'll need this later to set proper pkt size */ 809 pkt += IP_HDR_SIZE; 810 811 bp = (Bootp_t *)pkt; 812 bp->bp_op = OP_BOOTREQUEST; 813 bp->bp_htype = HWT_ETHER; 814 bp->bp_hlen = HWL_ETHER; 815 bp->bp_hops = 0; 816 bp->bp_secs = htons(get_timer(0) / 1000); 817 /* Do not set the client IP, your IP, or server IP yet, since it hasn't been ACK'ed by 818 * the server yet */ 819 820 /* 821 * RFC3046 requires Relay Agents to discard packets with 822 * nonzero and offered giaddr 823 */ 824 NetWriteIP(&bp->bp_giaddr, 0); 825 826 memcpy (bp->bp_chaddr, NetOurEther, 6); 827 828 /* 829 * ID is the id of the OFFER packet 830 */ 831 832 NetCopyLong(&bp->bp_id, &bp_offer->bp_id); 833 834 /* 835 * Copy options from OFFER packet if present 836 */ 837 838 /* Copy offered IP into the parameters request list */ 839 NetCopyIP(&OfferedIP, &bp_offer->bp_yiaddr); 840 extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_REQUEST, NetDHCPServerIP, OfferedIP); 841 842 pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen; 843 iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen; 844 NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); 845 846 debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen); 847 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY 848 udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY); 849 #endif /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */ 850 NetSendPacket(NetTxPacket, pktlen); 851 } 852 853 /* 854 * Handle DHCP received packets. 855 */ 856 static void 857 DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len) 858 { 859 Bootp_t *bp = (Bootp_t *)pkt; 860 861 debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n", 862 src, dest, len, dhcp_state); 863 864 if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */ 865 return; 866 867 debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n", 868 src, dest, len, dhcp_state); 869 870 switch (dhcp_state) { 871 case SELECTING: 872 /* 873 * Wait an appropriate time for any potential DHCPOFFER packets 874 * to arrive. Then select one, and generate DHCPREQUEST response. 875 * If filename is in format we recognize, assume it is a valid 876 * OFFER from a server we want. 877 */ 878 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file); 879 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 880 if (strncmp(bp->bp_file, 881 CONFIG_SYS_BOOTFILE_PREFIX, 882 strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0 ) { 883 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 884 885 debug("TRANSITIONING TO REQUESTING STATE\n"); 886 dhcp_state = REQUESTING; 887 888 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 889 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp); 890 891 NetSetTimeout(TIMEOUT, BootpTimeout); 892 DhcpSendRequestPkt(bp); 893 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 894 } 895 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 896 897 return; 898 break; 899 case REQUESTING: 900 debug("DHCP State: REQUESTING\n"); 901 902 if ( DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK ) { 903 char *s; 904 905 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 906 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp); 907 BootpCopyNetParams(bp); /* Store net params from reply */ 908 dhcp_state = BOUND; 909 printf ("DHCP client bound to address %pI4\n", &NetOurIP); 910 911 /* Obey the 'autoload' setting */ 912 if ((s = getenv("autoload")) != NULL) { 913 if (*s == 'n') { 914 /* 915 * Just use BOOTP to configure system; 916 * Do not use TFTP to load the bootfile. 917 */ 918 NetState = NETLOOP_SUCCESS; 919 return; 920 #if defined(CONFIG_CMD_NFS) 921 } else if (strcmp(s, "NFS") == 0) { 922 /* 923 * Use NFS to load the bootfile. 924 */ 925 NfsStart(); 926 return; 927 #endif 928 } 929 } 930 TftpStart(); 931 return; 932 } 933 break; 934 case BOUND: 935 /* DHCP client bound to address */ 936 break; 937 default: 938 puts ("DHCP: INVALID STATE\n"); 939 break; 940 } 941 942 } 943 944 void DhcpRequest(void) 945 { 946 BootpRequest(); 947 } 948 #endif /* CONFIG_CMD_DHCP */ 949