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 #if 0 12 #define DEBUG 1 /* general debug */ 13 #define DEBUG_BOOTP_EXT 1 /* Debug received vendor fields */ 14 #endif 15 16 #ifdef DEBUG_BOOTP_EXT 17 #define debug_ext(fmt,args...) printf (fmt ,##args) 18 #else 19 #define debug_ext(fmt,args...) 20 #endif 21 22 #include <common.h> 23 #include <command.h> 24 #include <net.h> 25 #include "bootp.h" 26 #include "tftp.h" 27 #include "nfs.h" 28 #ifdef CONFIG_STATUS_LED 29 #include <status_led.h> 30 #endif 31 32 #define BOOTP_VENDOR_MAGIC 0x63825363 /* RFC1048 Magic Cookie */ 33 34 #if defined(CONFIG_CMD_NET) 35 36 #define TIMEOUT 5UL /* Seconds before trying BOOTP again */ 37 #ifndef CONFIG_NET_RETRY_COUNT 38 # define TIMEOUT_COUNT 5 /* # of timeouts before giving up */ 39 #else 40 # define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT) 41 #endif 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 ulong BootpID; 51 int BootpTry; 52 #ifdef CONFIG_BOOTP_RANDOM_DELAY 53 ulong seed1, seed2; 54 #endif 55 56 #if defined(CONFIG_CMD_DHCP) 57 dhcp_state_t dhcp_state = INIT; 58 unsigned long dhcp_leasetime = 0; 59 IPaddr_t NetDHCPServerIP = 0; 60 static void DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len); 61 62 /* For Debug */ 63 #if 0 64 static char *dhcpmsg2str(int type) 65 { 66 switch (type) { 67 case 1: return "DHCPDISCOVER"; break; 68 case 2: return "DHCPOFFER"; break; 69 case 3: return "DHCPREQUEST"; break; 70 case 4: return "DHCPDECLINE"; break; 71 case 5: return "DHCPACK"; break; 72 case 6: return "DHCPNACK"; break; 73 case 7: return "DHCPRELEASE"; break; 74 default: return "UNKNOWN/INVALID MSG TYPE"; break; 75 } 76 } 77 #endif 78 79 #if defined(CONFIG_BOOTP_VENDOREX) 80 extern u8 *dhcp_vendorex_prep (u8 *e); /*rtn new e after add own opts. */ 81 extern u8 *dhcp_vendorex_proc (u8 *e); /*rtn next e if mine,else NULL */ 82 #endif 83 84 #endif 85 86 static int BootpCheckPkt(uchar *pkt, unsigned dest, unsigned src, unsigned len) 87 { 88 Bootp_t *bp = (Bootp_t *) pkt; 89 int retval = 0; 90 91 if (dest != PORT_BOOTPC || src != PORT_BOOTPS) 92 retval = -1; 93 else if (len < sizeof (Bootp_t) - OPT_SIZE) 94 retval = -2; 95 else if (bp->bp_op != OP_BOOTREQUEST && 96 bp->bp_op != OP_BOOTREPLY && 97 bp->bp_op != DHCP_OFFER && 98 bp->bp_op != DHCP_ACK && 99 bp->bp_op != DHCP_NAK ) { 100 retval = -3; 101 } 102 else if (bp->bp_htype != HWT_ETHER) 103 retval = -4; 104 else if (bp->bp_hlen != HWL_ETHER) 105 retval = -5; 106 else if (NetReadLong((ulong*)&bp->bp_id) != BootpID) { 107 retval = -6; 108 } 109 110 debug ("Filtering pkt = %d\n", retval); 111 112 return retval; 113 } 114 115 /* 116 * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet 117 */ 118 static void BootpCopyNetParams(Bootp_t *bp) 119 { 120 IPaddr_t tmp_ip; 121 122 NetCopyIP(&NetOurIP, &bp->bp_yiaddr); 123 #if !defined(CONFIG_BOOTP_SERVERIP) 124 NetCopyIP(&tmp_ip, &bp->bp_siaddr); 125 if (tmp_ip != 0) 126 NetCopyIP(&NetServerIP, &bp->bp_siaddr); 127 memcpy (NetServerEther, ((Ethernet_t *)NetRxPkt)->et_src, 6); 128 #endif 129 if (strlen(bp->bp_file) > 0) 130 copy_filename (BootFile, bp->bp_file, sizeof(BootFile)); 131 132 debug ("Bootfile: %s\n", BootFile); 133 134 /* Propagate to environment: 135 * don't delete exising entry when BOOTP / DHCP reply does 136 * not contain a new value 137 */ 138 if (*BootFile) { 139 setenv ("bootfile", BootFile); 140 } 141 } 142 143 static int truncate_sz (const char *name, int maxlen, int curlen) 144 { 145 if (curlen >= maxlen) { 146 printf("*** WARNING: %s is too long (%d - max: %d) - truncated\n", 147 name, curlen, maxlen); 148 curlen = maxlen - 1; 149 } 150 return (curlen); 151 } 152 153 #if !defined(CONFIG_CMD_DHCP) 154 155 static void BootpVendorFieldProcess (u8 * ext) 156 { 157 int size = *(ext + 1); 158 159 debug_ext ("[BOOTP] Processing extension %d... (%d bytes)\n", *ext, 160 *(ext + 1)); 161 162 NetBootFileSize = 0; 163 164 switch (*ext) { 165 /* Fixed length fields */ 166 case 1: /* Subnet mask */ 167 if (NetOurSubnetMask == 0) 168 NetCopyIP (&NetOurSubnetMask, (IPaddr_t *) (ext + 2)); 169 break; 170 case 2: /* Time offset - Not yet supported */ 171 break; 172 /* Variable length fields */ 173 case 3: /* Gateways list */ 174 if (NetOurGatewayIP == 0) { 175 NetCopyIP (&NetOurGatewayIP, (IPaddr_t *) (ext + 2)); 176 } 177 break; 178 case 4: /* Time server - Not yet supported */ 179 break; 180 case 5: /* IEN-116 name server - Not yet supported */ 181 break; 182 case 6: 183 if (NetOurDNSIP == 0) { 184 NetCopyIP (&NetOurDNSIP, (IPaddr_t *) (ext + 2)); 185 } 186 #if defined(CONFIG_BOOTP_DNS2) 187 if ((NetOurDNS2IP == 0) && (size > 4)) { 188 NetCopyIP (&NetOurDNS2IP, (IPaddr_t *) (ext + 2 + 4)); 189 } 190 #endif 191 break; 192 case 7: /* Log server - Not yet supported */ 193 break; 194 case 8: /* Cookie/Quote server - Not yet supported */ 195 break; 196 case 9: /* LPR server - Not yet supported */ 197 break; 198 case 10: /* Impress server - Not yet supported */ 199 break; 200 case 11: /* RPL server - Not yet supported */ 201 break; 202 case 12: /* Host name */ 203 if (NetOurHostName[0] == 0) { 204 size = truncate_sz ("Host Name", sizeof (NetOurHostName), size); 205 memcpy (&NetOurHostName, ext + 2, size); 206 NetOurHostName[size] = 0; 207 } 208 break; 209 case 13: /* Boot file size */ 210 if (size == 2) 211 NetBootFileSize = ntohs (*(ushort *) (ext + 2)); 212 else if (size == 4) 213 NetBootFileSize = ntohl (*(ulong *) (ext + 2)); 214 break; 215 case 14: /* Merit dump file - Not yet supported */ 216 break; 217 case 15: /* Domain name - Not yet supported */ 218 break; 219 case 16: /* Swap server - Not yet supported */ 220 break; 221 case 17: /* Root path */ 222 if (NetOurRootPath[0] == 0) { 223 size = truncate_sz ("Root Path", sizeof (NetOurRootPath), size); 224 memcpy (&NetOurRootPath, ext + 2, size); 225 NetOurRootPath[size] = 0; 226 } 227 break; 228 case 18: /* Extension path - Not yet supported */ 229 /* 230 * This can be used to send the information of the 231 * vendor area in another file that the client can 232 * access via TFTP. 233 */ 234 break; 235 /* IP host layer fields */ 236 case 40: /* NIS Domain name */ 237 if (NetOurNISDomain[0] == 0) { 238 size = truncate_sz ("NIS Domain Name", sizeof (NetOurNISDomain), size); 239 memcpy (&NetOurNISDomain, ext + 2, size); 240 NetOurNISDomain[size] = 0; 241 } 242 break; 243 /* Application layer fields */ 244 case 43: /* Vendor specific info - Not yet supported */ 245 /* 246 * Binary information to exchange specific 247 * product information. 248 */ 249 break; 250 /* Reserved (custom) fields (128..254) */ 251 } 252 } 253 254 static void BootpVendorProcess (u8 * ext, int size) 255 { 256 u8 *end = ext + size; 257 258 debug_ext ("[BOOTP] Checking extension (%d bytes)...\n", size); 259 260 while ((ext < end) && (*ext != 0xff)) { 261 if (*ext == 0) { 262 ext++; 263 } else { 264 u8 *opt = ext; 265 266 ext += ext[1] + 2; 267 if (ext <= end) 268 BootpVendorFieldProcess (opt); 269 } 270 } 271 272 #ifdef DEBUG_BOOTP_EXT 273 puts ("[BOOTP] Received fields: \n"); 274 if (NetOurSubnetMask) { 275 puts ("NetOurSubnetMask : "); 276 print_IPaddr (NetOurSubnetMask); 277 putc ('\n'); 278 } 279 280 if (NetOurGatewayIP) { 281 puts ("NetOurGatewayIP : "); 282 print_IPaddr (NetOurGatewayIP); 283 putc ('\n'); 284 } 285 286 if (NetBootFileSize) { 287 printf ("NetBootFileSize : %d\n", NetBootFileSize); 288 } 289 290 if (NetOurHostName[0]) { 291 printf ("NetOurHostName : %s\n", NetOurHostName); 292 } 293 294 if (NetOurRootPath[0]) { 295 printf ("NetOurRootPath : %s\n", NetOurRootPath); 296 } 297 298 if (NetOurNISDomain[0]) { 299 printf ("NetOurNISDomain : %s\n", NetOurNISDomain); 300 } 301 302 if (NetBootFileSize) { 303 printf ("NetBootFileSize: %d\n", NetBootFileSize); 304 } 305 #endif /* DEBUG_BOOTP_EXT */ 306 } 307 /* 308 * Handle a BOOTP received packet. 309 */ 310 static void 311 BootpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len) 312 { 313 Bootp_t *bp; 314 char *s; 315 316 debug ("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n", 317 src, dest, len, sizeof (Bootp_t)); 318 319 bp = (Bootp_t *)pkt; 320 321 if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */ 322 return; 323 324 /* 325 * Got a good BOOTP reply. Copy the data into our variables. 326 */ 327 #ifdef CONFIG_STATUS_LED 328 status_led_set (STATUS_LED_BOOT, STATUS_LED_OFF); 329 #endif 330 331 BootpCopyNetParams(bp); /* Store net parameters from reply */ 332 333 /* Retrieve extended information (we must parse the vendor area) */ 334 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 335 BootpVendorProcess((uchar *)&bp->bp_vend[4], len); 336 337 NetSetTimeout(0, (thand_f *)0); 338 339 debug ("Got good BOOTP\n"); 340 341 if ((s = getenv("autoload")) != NULL) { 342 if (*s == 'n') { 343 /* 344 * Just use BOOTP to configure system; 345 * Do not use TFTP to load the bootfile. 346 */ 347 NetState = NETLOOP_SUCCESS; 348 return; 349 #if defined(CONFIG_CMD_NFS) 350 } else if (strcmp(s, "NFS") == 0) { 351 /* 352 * Use NFS to load the bootfile. 353 */ 354 NfsStart(); 355 return; 356 #endif 357 } 358 } 359 360 TftpStart(); 361 } 362 #endif 363 364 /* 365 * Timeout on BOOTP/DHCP request. 366 */ 367 static void 368 BootpTimeout(void) 369 { 370 if (BootpTry >= TIMEOUT_COUNT) { 371 puts ("\nRetry count exceeded; starting again\n"); 372 NetStartAgain (); 373 } else { 374 NetSetTimeout (TIMEOUT * CFG_HZ, BootpTimeout); 375 BootpRequest (); 376 } 377 } 378 379 /* 380 * Initialize BOOTP extension fields in the request. 381 */ 382 #if defined(CONFIG_CMD_DHCP) 383 static int DhcpExtended (u8 * e, int message_type, IPaddr_t ServerID, IPaddr_t RequestedIP) 384 { 385 u8 *start = e; 386 u8 *cnt; 387 388 #if defined(CONFIG_BOOTP_VENDOREX) 389 u8 *x; 390 #endif 391 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 392 char *hostname; 393 #endif 394 395 *e++ = 99; /* RFC1048 Magic Cookie */ 396 *e++ = 130; 397 *e++ = 83; 398 *e++ = 99; 399 400 *e++ = 53; /* DHCP Message Type */ 401 *e++ = 1; 402 *e++ = message_type; 403 404 *e++ = 57; /* Maximum DHCP Message Size */ 405 *e++ = 2; 406 *e++ = (576 - 312 + OPT_SIZE) >> 8; 407 *e++ = (576 - 312 + OPT_SIZE) & 0xff; 408 409 if (ServerID) { 410 int tmp = ntohl (ServerID); 411 412 *e++ = 54; /* ServerID */ 413 *e++ = 4; 414 *e++ = tmp >> 24; 415 *e++ = tmp >> 16; 416 *e++ = tmp >> 8; 417 *e++ = tmp & 0xff; 418 } 419 420 if (RequestedIP) { 421 int tmp = ntohl (RequestedIP); 422 423 *e++ = 50; /* Requested IP */ 424 *e++ = 4; 425 *e++ = tmp >> 24; 426 *e++ = tmp >> 16; 427 *e++ = tmp >> 8; 428 *e++ = tmp & 0xff; 429 } 430 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 431 if ((hostname = getenv ("hostname"))) { 432 int hostnamelen = strlen (hostname); 433 434 *e++ = 12; /* Hostname */ 435 *e++ = hostnamelen; 436 memcpy (e, hostname, hostnamelen); 437 e += hostnamelen; 438 } 439 #endif 440 441 #if defined(CONFIG_BOOTP_VENDOREX) 442 if ((x = dhcp_vendorex_prep (e))) 443 return x - start; 444 #endif 445 446 *e++ = 55; /* Parameter Request List */ 447 cnt = e++; /* Pointer to count of requested items */ 448 *cnt = 0; 449 #if defined(CONFIG_BOOTP_SUBNETMASK) 450 *e++ = 1; /* Subnet Mask */ 451 *cnt += 1; 452 #endif 453 #if defined(CONFIG_BOOTP_TIMEOFFSET) 454 *e++ = 2; 455 *cnt += 1; 456 #endif 457 #if defined(CONFIG_BOOTP_GATEWAY) 458 *e++ = 3; /* Router Option */ 459 *cnt += 1; 460 #endif 461 #if defined(CONFIG_BOOTP_DNS) 462 *e++ = 6; /* DNS Server(s) */ 463 *cnt += 1; 464 #endif 465 #if defined(CONFIG_BOOTP_HOSTNAME) 466 *e++ = 12; /* Hostname */ 467 *cnt += 1; 468 #endif 469 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 470 *e++ = 13; /* Boot File Size */ 471 *cnt += 1; 472 #endif 473 #if defined(CONFIG_BOOTP_BOOTPATH) 474 *e++ = 17; /* Boot path */ 475 *cnt += 1; 476 #endif 477 #if defined(CONFIG_BOOTP_NISDOMAIN) 478 *e++ = 40; /* NIS Domain name request */ 479 *cnt += 1; 480 #endif 481 #if defined(CONFIG_BOOTP_NTPSERVER) 482 *e++ = 42; 483 *cnt += 1; 484 #endif 485 *e++ = 255; /* End of the list */ 486 487 /* Pad to minimal length */ 488 #ifdef CONFIG_DHCP_MIN_EXT_LEN 489 while ((e - start) <= CONFIG_DHCP_MIN_EXT_LEN) 490 *e++ = 0; 491 #endif 492 493 return e - start; 494 } 495 496 #else 497 /* 498 * Warning: no field size check - change CONFIG_BOOTP_* at your own risk! 499 */ 500 static int BootpExtended (u8 * e) 501 { 502 u8 *start = e; 503 504 *e++ = 99; /* RFC1048 Magic Cookie */ 505 *e++ = 130; 506 *e++ = 83; 507 *e++ = 99; 508 509 #if defined(CONFIG_CMD_DHCP) 510 *e++ = 53; /* DHCP Message Type */ 511 *e++ = 1; 512 *e++ = DHCP_DISCOVER; 513 514 *e++ = 57; /* Maximum DHCP Message Size */ 515 *e++ = 2; 516 *e++ = (576 - 312 + OPT_SIZE) >> 16; 517 *e++ = (576 - 312 + OPT_SIZE) & 0xff; 518 #endif 519 520 #if defined(CONFIG_BOOTP_SUBNETMASK) 521 *e++ = 1; /* Subnet mask request */ 522 *e++ = 4; 523 e += 4; 524 #endif 525 526 #if defined(CONFIG_BOOTP_GATEWAY) 527 *e++ = 3; /* Default gateway request */ 528 *e++ = 4; 529 e += 4; 530 #endif 531 532 #if defined(CONFIG_BOOTP_DNS) 533 *e++ = 6; /* Domain Name Server */ 534 *e++ = 4; 535 e += 4; 536 #endif 537 538 #if defined(CONFIG_BOOTP_HOSTNAME) 539 *e++ = 12; /* Host name request */ 540 *e++ = 32; 541 e += 32; 542 #endif 543 544 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 545 *e++ = 13; /* Boot file size */ 546 *e++ = 2; 547 e += 2; 548 #endif 549 550 #if defined(CONFIG_BOOTP_BOOTPATH) 551 *e++ = 17; /* Boot path */ 552 *e++ = 32; 553 e += 32; 554 #endif 555 556 #if defined(CONFIG_BOOTP_NISDOMAIN) 557 *e++ = 40; /* NIS Domain name request */ 558 *e++ = 32; 559 e += 32; 560 #endif 561 562 *e++ = 255; /* End of the list */ 563 564 return e - start; 565 } 566 #endif 567 568 void 569 BootpRequest (void) 570 { 571 volatile uchar *pkt, *iphdr; 572 Bootp_t *bp; 573 int ext_len, pktlen, iplen; 574 575 #if defined(CONFIG_CMD_DHCP) 576 dhcp_state = INIT; 577 #endif 578 579 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */ 580 unsigned char bi_enetaddr[6]; 581 int reg; 582 char *e,*s; 583 char tmp[64]; 584 ulong tst1, tst2, sum, m_mask, m_value = 0; 585 586 if (BootpTry ==0) { 587 /* get our mac */ 588 reg = getenv_r ("ethaddr", tmp, sizeof(tmp)); 589 s = (reg > 0) ? tmp : NULL; 590 591 for (reg=0; reg<6; ++reg) { 592 bi_enetaddr[reg] = s ? simple_strtoul(s, &e, 16) : 0; 593 if (s) { 594 s = (*e) ? e+1 : e; 595 } 596 } 597 #ifdef DEBUG 598 puts ("BootpRequest => Our Mac: "); 599 for (reg=0; reg<6; reg++) { 600 printf ("%x%c", 601 bi_enetaddr[reg], 602 reg==5 ? '\n' : ':'); 603 } 604 #endif /* DEBUG */ 605 606 /* Mac-Manipulation 2 get seed1 */ 607 tst1=0; 608 tst2=0; 609 for (reg=2; reg<6; reg++) { 610 tst1 = tst1 << 8; 611 tst1 = tst1 | bi_enetaddr[reg]; 612 } 613 for (reg=0; reg<2; reg++) { 614 tst2 = tst2 | bi_enetaddr[reg]; 615 tst2 = tst2 << 8; 616 } 617 618 seed1 = tst1^tst2; 619 620 /* Mirror seed1*/ 621 m_mask=0x1; 622 for (reg=1;reg<=32;reg++) { 623 m_value |= (m_mask & seed1); 624 seed1 = seed1 >> 1; 625 m_value = m_value << 1; 626 } 627 seed1 = m_value; 628 seed2 = 0xB78D0945; 629 } 630 631 /* Random Number Generator */ 632 633 for (reg=0;reg<=0;reg++) { 634 sum = seed1 + seed2; 635 if (sum < seed1 || sum < seed2) 636 sum++; 637 seed2 = seed1; 638 seed1 = sum; 639 640 if (BootpTry<=2) { /* Start with max 1024 * 1ms */ 641 sum = sum >> (22-BootpTry); 642 } else { /*After 3rd BOOTP request max 8192 * 1ms */ 643 sum = sum >> 19; 644 } 645 } 646 647 printf ("Random delay: %ld ms...\n", sum); 648 for (reg=0; reg <sum; reg++) { 649 udelay(1000); /*Wait 1ms*/ 650 } 651 #endif /* CONFIG_BOOTP_RANDOM_DELAY */ 652 653 printf("BOOTP broadcast %d\n", ++BootpTry); 654 pkt = NetTxPacket; 655 memset ((void*)pkt, 0, PKTSIZE); 656 657 pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP); 658 659 /* 660 * Next line results in incorrect packet size being transmitted, resulting 661 * in errors in some DHCP servers, reporting missing bytes. Size must be 662 * set in packet header after extension length has been determined. 663 * C. Hallinan, DS4.COM, Inc. 664 */ 665 /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */ 666 iphdr = pkt; /* We need this later for NetSetIP() */ 667 pkt += IP_HDR_SIZE; 668 669 bp = (Bootp_t *)pkt; 670 bp->bp_op = OP_BOOTREQUEST; 671 bp->bp_htype = HWT_ETHER; 672 bp->bp_hlen = HWL_ETHER; 673 bp->bp_hops = 0; 674 bp->bp_secs = htons(get_timer(0) / CFG_HZ); 675 NetWriteIP(&bp->bp_ciaddr, 0); 676 NetWriteIP(&bp->bp_yiaddr, 0); 677 NetWriteIP(&bp->bp_siaddr, 0); 678 NetWriteIP(&bp->bp_giaddr, 0); 679 memcpy (bp->bp_chaddr, NetOurEther, 6); 680 copy_filename (bp->bp_file, BootFile, sizeof(bp->bp_file)); 681 682 /* Request additional information from the BOOTP/DHCP server */ 683 #if defined(CONFIG_CMD_DHCP) 684 ext_len = DhcpExtended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0); 685 #else 686 ext_len = BootpExtended((u8 *)bp->bp_vend); 687 #endif 688 689 /* 690 * Bootp ID is the lower 4 bytes of our ethernet address 691 * plus the current time in HZ. 692 */ 693 BootpID = ((ulong)NetOurEther[2] << 24) 694 | ((ulong)NetOurEther[3] << 16) 695 | ((ulong)NetOurEther[4] << 8) 696 | (ulong)NetOurEther[5]; 697 BootpID += get_timer(0); 698 BootpID = htonl(BootpID); 699 NetCopyLong(&bp->bp_id, &BootpID); 700 701 /* 702 * Calculate proper packet lengths taking into account the 703 * variable size of the options field 704 */ 705 pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + ext_len; 706 iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len; 707 NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); 708 NetSetTimeout(SELECT_TIMEOUT * CFG_HZ, BootpTimeout); 709 710 #if defined(CONFIG_CMD_DHCP) 711 dhcp_state = SELECTING; 712 NetSetHandler(DhcpHandler); 713 #else 714 NetSetHandler(BootpHandler); 715 #endif 716 NetSendPacket(NetTxPacket, pktlen); 717 } 718 719 #if defined(CONFIG_CMD_DHCP) 720 static void DhcpOptionsProcess (uchar * popt, Bootp_t *bp) 721 { 722 uchar *end = popt + BOOTP_HDR_SIZE; 723 int oplen, size; 724 725 while (popt < end && *popt != 0xff) { 726 oplen = *(popt + 1); 727 switch (*popt) { 728 case 1: 729 NetCopyIP (&NetOurSubnetMask, (popt + 2)); 730 break; 731 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 732 case 2: /* Time offset */ 733 NetCopyLong ((ulong *)&NetTimeOffset, (ulong *) (popt + 2)); 734 NetTimeOffset = ntohl (NetTimeOffset); 735 break; 736 #endif 737 case 3: 738 NetCopyIP (&NetOurGatewayIP, (popt + 2)); 739 break; 740 case 6: 741 NetCopyIP (&NetOurDNSIP, (popt + 2)); 742 #if defined(CONFIG_BOOTP_DNS2) 743 if (*(popt + 1) > 4) { 744 NetCopyIP (&NetOurDNS2IP, (popt + 2 + 4)); 745 } 746 #endif 747 break; 748 case 12: 749 size = truncate_sz ("Host Name", sizeof (NetOurHostName), oplen); 750 memcpy (&NetOurHostName, popt + 2, size); 751 NetOurHostName[size] = 0; 752 break; 753 case 15: /* Ignore Domain Name Option */ 754 break; 755 case 17: 756 size = truncate_sz ("Root Path", sizeof (NetOurRootPath), oplen); 757 memcpy (&NetOurRootPath, popt + 2, size); 758 NetOurRootPath[size] = 0; 759 break; 760 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 761 case 42: /* NTP server IP */ 762 NetCopyIP (&NetNtpServerIP, (popt + 2)); 763 break; 764 #endif 765 case 51: 766 NetCopyLong (&dhcp_leasetime, (ulong *) (popt + 2)); 767 break; 768 case 53: /* Ignore Message Type Option */ 769 break; 770 case 54: 771 NetCopyIP (&NetDHCPServerIP, (popt + 2)); 772 break; 773 case 58: /* Ignore Renewal Time Option */ 774 break; 775 case 59: /* Ignore Rebinding Time Option */ 776 break; 777 case 66: /* Ignore TFTP server name */ 778 break; 779 case 67: /* vendor opt bootfile */ 780 /* 781 * I can't use dhcp_vendorex_proc here because I need 782 * to write into the bootp packet - even then I had to 783 * pass the bootp packet pointer into here as the 784 * second arg 785 */ 786 size = truncate_sz ("Opt Boot File", 787 sizeof(bp->bp_file), 788 oplen); 789 if (bp->bp_file[0] == '\0' && size > 0) { 790 /* 791 * only use vendor boot file if we didn't 792 * receive a boot file in the main non-vendor 793 * part of the packet - god only knows why 794 * some vendors chose not to use this perfectly 795 * good spot to store the boot file (join on 796 * Tru64 Unix) it seems mind bogglingly crazy 797 * to me 798 */ 799 printf("*** WARNING: using vendor " 800 "optional boot file\n"); 801 memcpy(bp->bp_file, popt + 2, size); 802 bp->bp_file[size] = '\0'; 803 } 804 break; 805 default: 806 #if defined(CONFIG_BOOTP_VENDOREX) 807 if (dhcp_vendorex_proc (popt)) 808 break; 809 #endif 810 printf ("*** Unhandled DHCP Option in OFFER/ACK: %d\n", *popt); 811 break; 812 } 813 popt += oplen + 2; /* Process next option */ 814 } 815 } 816 817 static int DhcpMessageType(unsigned char *popt) 818 { 819 if (NetReadLong((ulong*)popt) != htonl(BOOTP_VENDOR_MAGIC)) 820 return -1; 821 822 popt += 4; 823 while ( *popt != 0xff ) { 824 if ( *popt == 53 ) /* DHCP Message Type */ 825 return *(popt + 2); 826 popt += *(popt + 1) + 2; /* Scan through all options */ 827 } 828 return -1; 829 } 830 831 static void DhcpSendRequestPkt(Bootp_t *bp_offer) 832 { 833 volatile uchar *pkt, *iphdr; 834 Bootp_t *bp; 835 int pktlen, iplen, extlen; 836 IPaddr_t OfferedIP; 837 838 debug ("DhcpSendRequestPkt: Sending DHCPREQUEST\n"); 839 pkt = NetTxPacket; 840 memset ((void*)pkt, 0, PKTSIZE); 841 842 pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP); 843 844 iphdr = pkt; /* We'll need this later to set proper pkt size */ 845 pkt += IP_HDR_SIZE; 846 847 bp = (Bootp_t *)pkt; 848 bp->bp_op = OP_BOOTREQUEST; 849 bp->bp_htype = HWT_ETHER; 850 bp->bp_hlen = HWL_ETHER; 851 bp->bp_hops = 0; 852 bp->bp_secs = htons(get_timer(0) / CFG_HZ); 853 /* Do not set the client IP, your IP, or server IP yet, since it hasn't been ACK'ed by 854 * the server yet */ 855 856 /* 857 * RFC3046 requires Relay Agents to discard packets with 858 * nonzero and offered giaddr 859 */ 860 NetWriteIP(&bp->bp_giaddr, 0); 861 862 memcpy (bp->bp_chaddr, NetOurEther, 6); 863 864 /* 865 * ID is the id of the OFFER packet 866 */ 867 868 NetCopyLong(&bp->bp_id, &bp_offer->bp_id); 869 870 /* 871 * Copy options from OFFER packet if present 872 */ 873 874 /* Copy offered IP into the parameters request list */ 875 NetCopyIP(&OfferedIP, &bp_offer->bp_yiaddr); 876 extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_REQUEST, NetDHCPServerIP, OfferedIP); 877 878 pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + extlen; 879 iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen; 880 NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); 881 882 debug ("Transmitting DHCPREQUEST packet: len = %d\n", pktlen); 883 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY 884 udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY); 885 #endif /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */ 886 NetSendPacket(NetTxPacket, pktlen); 887 } 888 889 /* 890 * Handle DHCP received packets. 891 */ 892 static void 893 DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len) 894 { 895 Bootp_t *bp = (Bootp_t *)pkt; 896 897 debug ("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n", 898 src, dest, len, dhcp_state); 899 900 if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */ 901 return; 902 903 debug ("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n", 904 src, dest, len, dhcp_state); 905 906 switch (dhcp_state) { 907 case SELECTING: 908 /* 909 * Wait an appropriate time for any potential DHCPOFFER packets 910 * to arrive. Then select one, and generate DHCPREQUEST response. 911 * If filename is in format we recognize, assume it is a valid 912 * OFFER from a server we want. 913 */ 914 debug ("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file); 915 #ifdef CFG_BOOTFILE_PREFIX 916 if (strncmp(bp->bp_file, 917 CFG_BOOTFILE_PREFIX, 918 strlen(CFG_BOOTFILE_PREFIX)) == 0 ) { 919 #endif /* CFG_BOOTFILE_PREFIX */ 920 921 debug ("TRANSITIONING TO REQUESTING STATE\n"); 922 dhcp_state = REQUESTING; 923 924 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 925 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp); 926 927 NetSetTimeout(TIMEOUT * CFG_HZ, BootpTimeout); 928 DhcpSendRequestPkt(bp); 929 #ifdef CFG_BOOTFILE_PREFIX 930 } 931 #endif /* CFG_BOOTFILE_PREFIX */ 932 933 return; 934 break; 935 case REQUESTING: 936 debug ("DHCP State: REQUESTING\n"); 937 938 if ( DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK ) { 939 char *s; 940 941 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 942 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp); 943 BootpCopyNetParams(bp); /* Store net params from reply */ 944 dhcp_state = BOUND; 945 puts ("DHCP client bound to address "); 946 print_IPaddr(NetOurIP); 947 putc ('\n'); 948 949 /* Obey the 'autoload' setting */ 950 if ((s = getenv("autoload")) != NULL) { 951 if (*s == 'n') { 952 /* 953 * Just use BOOTP to configure system; 954 * Do not use TFTP to load the bootfile. 955 */ 956 NetState = NETLOOP_SUCCESS; 957 return; 958 #if defined(CONFIG_CMD_NFS) 959 } else if (strcmp(s, "NFS") == 0) { 960 /* 961 * Use NFS to load the bootfile. 962 */ 963 NfsStart(); 964 return; 965 #endif 966 } 967 } 968 TftpStart(); 969 return; 970 } 971 break; 972 case BOUND: 973 /* DHCP client bound to address */ 974 break; 975 default: 976 puts ("DHCP: INVALID STATE\n"); 977 break; 978 } 979 980 } 981 982 void DhcpRequest(void) 983 { 984 BootpRequest(); 985 } 986 #endif /* CONFIG_CMD_DHCP */ 987 988 #endif /* CONFIG_CMD_NET */ 989