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 2000-2002 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 #ifdef CONFIG_STATUS_LED 28 #include <status_led.h> 29 #endif 30 31 #define BOOTP_VENDOR_MAGIC 0x63825363 /* RFC1048 Magic Cookie */ 32 33 #if (CONFIG_COMMANDS & CFG_CMD_NET) 34 35 #define TIMEOUT 5 /* Seconds before trying BOOTP again */ 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 42 #define PORT_BOOTPS 67 /* BOOTP server UDP port */ 43 #define PORT_BOOTPC 68 /* BOOTP client UDP port */ 44 45 #ifndef CONFIG_DHCP_MIN_EXT_LEN /* minimal length of extension list */ 46 #define CONFIG_DHCP_MIN_EXT_LEN 64 47 #endif 48 49 ulong BootpID; 50 int BootpTry; 51 #ifdef CONFIG_BOOTP_RANDOM_DELAY 52 ulong seed1, seed2; 53 #endif 54 55 #if (CONFIG_COMMANDS & CFG_CMD_DHCP) 56 dhcp_state_t dhcp_state = INIT; 57 unsigned long dhcp_leasetime = 0; 58 IPaddr_t NetDHCPServerIP = 0; 59 static void DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len); 60 61 /* For Debug */ 62 #if 0 63 static char *dhcpmsg2str(int type) 64 { 65 switch (type) { 66 case 1: return "DHCPDISCOVER"; break; 67 case 2: return "DHCPOFFER"; break; 68 case 3: return "DHCPREQUEST"; break; 69 case 4: return "DHCPDECLINE"; break; 70 case 5: return "DHCPACK"; break; 71 case 6: return "DHCPNACK"; break; 72 case 7: return "DHCPRELEASE"; break; 73 default: return "UNKNOWN/INVALID MSG TYPE"; break; 74 } 75 } 76 #endif 77 78 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX) 79 extern u8 *dhcp_vendorex_prep (u8 *e); /*rtn new e after add own opts. */ 80 extern u8 *dhcp_vendorex_proc (u8 *e); /*rtn next e if mine,else NULL */ 81 #endif 82 83 #endif /* CFG_CMD_DHCP */ 84 85 static int BootpCheckPkt(uchar *pkt, unsigned dest, unsigned src, unsigned len) 86 { 87 Bootp_t *bp = (Bootp_t *) pkt; 88 int retval = 0; 89 90 if (dest != PORT_BOOTPC || src != PORT_BOOTPS) 91 retval = -1; 92 else if (len < sizeof (Bootp_t) - OPT_SIZE) 93 retval = -2; 94 else if (bp->bp_op != OP_BOOTREQUEST && 95 bp->bp_op != OP_BOOTREPLY && 96 bp->bp_op != DHCP_OFFER && 97 bp->bp_op != DHCP_ACK && 98 bp->bp_op != DHCP_NAK ) { 99 retval = -3; 100 } 101 else if (bp->bp_htype != HWT_ETHER) 102 retval = -4; 103 else if (bp->bp_hlen != HWL_ETHER) 104 retval = -5; 105 else if (NetReadLong((ulong*)&bp->bp_id) != BootpID) { 106 retval = -6; 107 } 108 109 debug ("Filtering pkt = %d\n", retval); 110 111 return retval; 112 } 113 114 /* 115 * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet 116 */ 117 static void BootpCopyNetParams(Bootp_t *bp) 118 { 119 NetCopyIP(&NetOurIP, &bp->bp_yiaddr); 120 NetCopyIP(&NetServerIP, &bp->bp_siaddr); 121 memcpy (NetServerEther, ((Ethernet_t *)NetRxPkt)->et_src, 6); 122 copy_filename (BootFile, bp->bp_file, sizeof(BootFile)); 123 124 debug ("Bootfile: %s\n", BootFile); 125 126 /* Propagate to environment: 127 * don't delete exising entry when BOOTP / DHCP reply does 128 * not contain a new value 129 */ 130 if (*BootFile) { 131 setenv ("bootfile", BootFile); 132 } 133 } 134 135 static int truncate_sz (const char *name, int maxlen, int curlen) 136 { 137 if (curlen >= maxlen) { 138 printf("*** WARNING: %s is too long (%d - max: %d) - truncated\n", 139 name, curlen, maxlen); 140 curlen = maxlen - 1; 141 } 142 return (curlen); 143 } 144 145 #if !(CONFIG_COMMANDS & CFG_CMD_DHCP) 146 147 static void BootpVendorFieldProcess(u8 *ext) 148 { 149 int size = *(ext+1) ; 150 151 debug_ext ("[BOOTP] Processing extension %d... (%d bytes)\n", *ext, *(ext+1)); 152 153 NetBootFileSize = 0; 154 155 switch (*ext) { 156 /* Fixed length fields */ 157 case 1: /* Subnet mask */ 158 if (NetOurSubnetMask == 0) 159 NetCopyIP(&NetOurSubnetMask, (IPaddr_t*)(ext+2)); 160 break; 161 case 2: /* Time offset - Not yet supported */ 162 break; 163 /* Variable length fields */ 164 case 3: /* Gateways list */ 165 if (NetOurGatewayIP == 0) { 166 NetCopyIP(&NetOurGatewayIP, (IPaddr_t*)(ext+2)); 167 } 168 break; 169 case 4: /* Time server - Not yet supported */ 170 break; 171 case 5: /* IEN-116 name server - Not yet supported */ 172 break; 173 case 6: 174 if (NetOurDNSIP == 0) { 175 NetCopyIP(&NetOurDNSIP, (IPaddr_t*)(ext+2)); 176 } 177 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS2) 178 if ((NetOurDNS2IP == 0) && (size > 4)) { 179 NetCopyIP(&NetOurDNS2IP, (IPaddr_t*)(ext+2+4)); 180 } 181 #endif 182 break; 183 case 7: /* Log server - Not yet supported */ 184 break; 185 case 8: /* Cookie/Quote server - Not yet supported */ 186 break; 187 case 9: /* LPR server - Not yet supported */ 188 break; 189 case 10: /* Impress server - Not yet supported */ 190 break; 191 case 11: /* RPL server - Not yet supported */ 192 break; 193 case 12: /* Host name */ 194 if (NetOurHostName[0] == 0) { 195 size = truncate_sz("Host Name", sizeof(NetOurHostName), size); 196 memcpy(&NetOurHostName, ext+2, size); 197 NetOurHostName[size] = 0 ; 198 } 199 break; 200 case 13: /* Boot file size */ 201 if (size == 2) 202 NetBootFileSize = ntohs(*(ushort*)(ext+2)); 203 else if (size == 4) 204 NetBootFileSize = ntohl(*(ulong*)(ext+2)); 205 break; 206 case 14: /* Merit dump file - Not yet supported */ 207 break; 208 case 15: /* Domain name - Not yet supported */ 209 break; 210 case 16: /* Swap server - Not yet supported */ 211 break; 212 case 17: /* Root path */ 213 if (NetOurRootPath[0] == 0) { 214 size = truncate_sz("Root Path", sizeof(NetOurRootPath), size); 215 memcpy(&NetOurRootPath, ext+2, size); 216 NetOurRootPath[size] = 0 ; 217 } 218 break; 219 case 18: /* Extension path - Not yet supported */ 220 /* 221 * This can be used to send the information of the 222 * vendor area in another file that the client can 223 * access via TFTP. 224 */ 225 break; 226 /* IP host layer fields */ 227 case 40: /* NIS Domain name */ 228 if (NetOurNISDomain[0] == 0) { 229 size = truncate_sz ("NIS Domain Name", 230 sizeof(NetOurNISDomain), 231 size); 232 memcpy(&NetOurNISDomain, ext+2, size); 233 NetOurNISDomain[size] = 0 ; 234 } 235 break; 236 /* Application layer fields */ 237 case 43: /* Vendor specific info - Not yet supported */ 238 /* 239 * Binary information to exchange specific 240 * product information. 241 */ 242 break; 243 /* Reserved (custom) fields (128..254) */ 244 } 245 } 246 247 static void BootpVendorProcess(u8 *ext, int size) 248 { 249 u8 *end = ext + size ; 250 251 debug_ext ("[BOOTP] Checking extension (%d bytes)...\n", size); 252 253 while ((ext < end) && (*ext != 0xff)) { 254 if (*ext == 0) { 255 ext ++ ; 256 } else { 257 u8 *opt = ext ; 258 ext += ext[1] + 2 ; 259 if (ext <= end) 260 BootpVendorFieldProcess (opt) ; 261 } 262 } 263 264 #ifdef DEBUG_BOOTP_EXT 265 printf("[BOOTP] Received fields: \n"); 266 if (NetOurSubnetMask) { 267 puts ("NetOurSubnetMask : "); 268 print_IPaddr (NetOurSubnetMask); 269 putc('\n'); 270 } 271 272 if (NetOurGatewayIP) { 273 puts ("NetOurGatewayIP : "); 274 print_IPaddr (NetOurGatewayIP); 275 putc('\n'); 276 } 277 278 if (NetBootFileSize) { 279 printf("NetBootFileSize : %d\n", NetBootFileSize); 280 } 281 282 if (NetOurHostName[0]) { 283 printf("NetOurHostName : %s\n", NetOurHostName); 284 } 285 286 if (NetOurRootPath[0]) { 287 printf("NetOurRootPath : %s\n", NetOurRootPath); 288 } 289 290 if (NetOurNISDomain[0]) { 291 printf("NetOurNISDomain : %s\n", NetOurNISDomain); 292 } 293 294 if (NetBootFileSize) { 295 printf("NetBootFileSize: %d\n", NetBootFileSize); 296 } 297 #endif /* DEBUG_BOOTP_EXT */ 298 } 299 300 /* 301 * Handle a BOOTP received packet. 302 */ 303 static void 304 BootpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len) 305 { 306 Bootp_t *bp; 307 char *s; 308 309 debug ("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%d)\n", 310 src, dest, len, sizeof (Bootp_t)); 311 312 bp = (Bootp_t *)pkt; 313 314 if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */ 315 return; 316 317 /* 318 * Got a good BOOTP reply. Copy the data into our variables. 319 */ 320 #ifdef CONFIG_STATUS_LED 321 status_led_set (STATUS_LED_BOOT, STATUS_LED_OFF); 322 #endif 323 324 BootpCopyNetParams(bp); /* Store net parameters from reply */ 325 326 /* Retrieve extended information (we must parse the vendor area) */ 327 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 328 BootpVendorProcess(&bp->bp_vend[4], len); 329 330 NetSetTimeout(0, (thand_f *)0); 331 332 debug ("Got good BOOTP\n"); 333 334 if (((s = getenv("autoload")) != NULL) && (*s == 'n')) { 335 /* 336 * Just use BOOTP to configure system; 337 * Do not use TFTP to load the bootfile. 338 */ 339 NetState = NETLOOP_SUCCESS; 340 return; 341 } 342 343 TftpStart(); 344 } 345 #endif /* !CFG_CMD_DHCP */ 346 347 /* 348 * Timeout on BOOTP/DHCP request. 349 */ 350 static void 351 BootpTimeout(void) 352 { 353 if (BootpTry >= TIMEOUT_COUNT) { 354 puts ("\nRetry count exceeded; starting again\n"); 355 NetStartAgain (); 356 } else { 357 NetSetTimeout (TIMEOUT * CFG_HZ, BootpTimeout); 358 BootpRequest (); 359 } 360 } 361 362 /* 363 * Initialize BOOTP extension fields in the request. 364 */ 365 #if (CONFIG_COMMANDS & CFG_CMD_DHCP) 366 static int DhcpExtended(u8 *e, int message_type, IPaddr_t ServerID, IPaddr_t RequestedIP) 367 { 368 u8 *start = e ; 369 u8 *cnt; 370 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX) 371 u8 *x; 372 #endif 373 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SEND_HOSTNAME) 374 uchar *hostname; 375 #endif 376 377 *e++ = 99; /* RFC1048 Magic Cookie */ 378 *e++ = 130; 379 *e++ = 83; 380 *e++ = 99; 381 382 *e++ = 53; /* DHCP Message Type */ 383 *e++ = 1; 384 *e++ = message_type; 385 386 *e++ = 57; /* Maximum DHCP Message Size */ 387 *e++ = 2; 388 *e++ = (576-312+OPT_SIZE) >> 8; 389 *e++ = (576-312+OPT_SIZE) & 0xff; 390 391 if ( ServerID ) { 392 int tmp = ntohl(ServerID); 393 394 *e++ = 54; /* ServerID */ 395 *e++ = 4; 396 *e++ = tmp >> 24; 397 *e++ = tmp >> 16; 398 *e++ = tmp >> 8; 399 *e++ = tmp & 0xff; 400 } 401 402 if ( RequestedIP ) { 403 int tmp = ntohl(RequestedIP); 404 405 *e++ = 50; /* Requested IP */ 406 *e++ = 4; 407 *e++ = tmp >> 24; 408 *e++ = tmp >> 16; 409 *e++ = tmp >> 8; 410 *e++ = tmp & 0xff; 411 } 412 413 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SEND_HOSTNAME) 414 if ( (hostname = getenv("hostname")) ) { 415 int hostnamelen = strlen(hostname); 416 *e++ = 12; /* Hostname */ 417 *e++ = hostnamelen; 418 memcpy(e,hostname,hostnamelen); 419 e += hostnamelen; 420 } 421 #endif 422 423 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX) 424 if ((x = dhcp_vendorex_prep (e))) 425 return x - start ; 426 #endif 427 428 *e++ = 55; /* Parameter Request List */ 429 cnt = e++; /* Pointer to count of requested items */ 430 *cnt = 0; 431 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SUBNETMASK) 432 *e++ = 1; /* Subnet Mask */ 433 *cnt += 1; 434 #endif 435 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_GATEWAY) 436 *e++ = 3; /* Router Option */ 437 *cnt += 1; 438 #endif 439 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS) 440 *e++ = 6; /* DNS Server(s) */ 441 *cnt += 1; 442 #endif 443 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_HOSTNAME) 444 *e++ = 12; /* Hostname */ 445 *cnt += 1; 446 #endif 447 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTFILESIZE) 448 *e++ = 13; /* Boot File Size */ 449 *cnt += 1; 450 #endif 451 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTPATH) 452 *e++ = 17; /* Boot path */ 453 *cnt += 1; 454 #endif 455 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_NISDOMAIN) 456 *e++ = 40; /* NIS Domain name request */ 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 /* CFG_CMD_DHCP */ 471 /* 472 * Warning: no field size check - change CONFIG_BOOTP_MASK 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 (CONFIG_COMMANDS & CFG_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 /* CFG_CMD_DHCP */ 493 494 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SUBNETMASK) 495 *e++ = 1; /* Subnet mask request */ 496 *e++ = 4; 497 e += 4; 498 #endif 499 500 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_GATEWAY) 501 *e++ = 3; /* Default gateway request */ 502 *e++ = 4; 503 e += 4; 504 #endif 505 506 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS) 507 *e++ = 6; /* Domain Name Server */ 508 *e++ = 4; 509 e += 4; 510 #endif 511 512 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_HOSTNAME) 513 *e++ = 12; /* Host name request */ 514 *e++ = 32; 515 e += 32; 516 #endif 517 518 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTFILESIZE) 519 *e++ = 13; /* Boot file size */ 520 *e++ = 2; 521 e += 2; 522 #endif 523 524 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTPATH) 525 *e++ = 17; /* Boot path */ 526 *e++ = 32; 527 e += 32; 528 #endif 529 530 #if (CONFIG_BOOTP_MASK & 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 /* CFG_CMD_DHCP */ 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 (CONFIG_COMMANDS & CFG_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 char *e,*s; 557 uchar tmp[64]; 558 ulong tst1, tst2, sum, m_mask, m_value = 0; 559 560 if (BootpTry ==0) { 561 /* get our mac */ 562 reg = getenv_r ("ethaddr", tmp, sizeof(tmp)); 563 s = (reg > 0) ? tmp : NULL; 564 565 for (reg=0; reg<6; ++reg) { 566 bi_enetaddr[reg] = s ? simple_strtoul(s, &e, 16) : 0; 567 if (s) { 568 s = (*e) ? e+1 : e; 569 } 570 } 571 #ifdef DEBUG 572 printf("BootpRequest => Our Mac: "); 573 for (reg=0; reg<6; reg++) { 574 printf ("%x%c", 575 bi_enetaddr[reg], 576 reg==5 ? '\n' : ':'); 577 } 578 #endif /* DEBUG */ 579 580 /* Mac-Manipulation 2 get seed1 */ 581 tst1=0; 582 tst2=0; 583 for (reg=2; reg<6; reg++) { 584 tst1 = tst1 << 8; 585 tst1 = tst1 | bi_enetaddr[reg]; 586 } 587 for (reg=0; reg<2; reg++) { 588 tst2 = tst2 | bi_enetaddr[reg]; 589 tst2 = tst2 << 8; 590 } 591 592 seed1 = tst1^tst2; 593 594 /* Mirror seed1*/ 595 m_mask=0x1; 596 for (reg=1;reg<=32;reg++) { 597 m_value |= (m_mask & seed1); 598 seed1 = seed1 >> 1; 599 m_value = m_value << 1; 600 } 601 seed1 = m_value; 602 seed2 = 0xB78D0945; 603 } 604 605 /* Random Number Generator */ 606 607 for (reg=0;reg<=0;reg++) { 608 sum = seed1 + seed2; 609 if (sum < seed1 || sum < seed2) 610 sum++; 611 seed2 = seed1; 612 seed1 = sum; 613 614 if (BootpTry<=2) { /* Start with max 1024 * 1ms */ 615 sum = sum >> (22-BootpTry); 616 } else { /*After 3rd BOOTP request max 8192 * 1ms */ 617 sum = sum >> 19; 618 } 619 } 620 621 printf ("Random delay: %ld ms...\n", sum); 622 for (reg=0; reg <sum; reg++) { 623 udelay(1000); /*Wait 1ms*/ 624 } 625 #endif /* CONFIG_BOOTP_RANDOM_DELAY */ 626 627 printf("BOOTP broadcast %d\n", ++BootpTry); 628 pkt = NetTxPacket; 629 memset ((void*)pkt, 0, PKTSIZE); 630 631 NetSetEther(pkt, NetBcastAddr, PROT_IP); 632 pkt += ETHER_HDR_SIZE; 633 634 /* 635 * Next line results in incorrect packet size being transmitted, resulting 636 * in errors in some DHCP servers, reporting missing bytes. Size must be 637 * set in packet header after extension length has been determined. 638 * C. Hallinan, DS4.COM, Inc. 639 */ 640 /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */ 641 iphdr = pkt; /* We need this later for NetSetIP() */ 642 pkt += IP_HDR_SIZE; 643 644 bp = (Bootp_t *)pkt; 645 bp->bp_op = OP_BOOTREQUEST; 646 bp->bp_htype = HWT_ETHER; 647 bp->bp_hlen = HWL_ETHER; 648 bp->bp_hops = 0; 649 bp->bp_secs = htons(get_timer(0) / CFG_HZ); 650 NetWriteIP(&bp->bp_ciaddr, 0); 651 NetWriteIP(&bp->bp_yiaddr, 0); 652 NetWriteIP(&bp->bp_siaddr, 0); 653 NetWriteIP(&bp->bp_giaddr, 0); 654 memcpy (bp->bp_chaddr, NetOurEther, 6); 655 copy_filename (bp->bp_file, BootFile, sizeof(bp->bp_file)); 656 657 /* Request additional information from the BOOTP/DHCP server */ 658 #if (CONFIG_COMMANDS & CFG_CMD_DHCP) 659 ext_len = DhcpExtended(bp->bp_vend, DHCP_DISCOVER, 0, 0); 660 #else 661 ext_len = BootpExtended(bp->bp_vend); 662 #endif /* CFG_CMD_DHCP */ 663 664 /* 665 * Bootp ID is the lower 4 bytes of our ethernet address 666 * plus the current time in HZ. 667 */ 668 BootpID = ((ulong)NetOurEther[2] << 24) 669 | ((ulong)NetOurEther[3] << 16) 670 | ((ulong)NetOurEther[4] << 8) 671 | (ulong)NetOurEther[5]; 672 BootpID += get_timer(0); 673 BootpID = htonl(BootpID); 674 NetCopyLong(&bp->bp_id, &BootpID); 675 676 /* 677 * Calculate proper packet lengths taking into account the 678 * variable size of the options field 679 */ 680 pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + ext_len; 681 iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len; 682 NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); 683 NetSetTimeout(SELECT_TIMEOUT * CFG_HZ, BootpTimeout); 684 685 #if (CONFIG_COMMANDS & CFG_CMD_DHCP) 686 dhcp_state = SELECTING; 687 NetSetHandler(DhcpHandler); 688 #else 689 NetSetHandler(BootpHandler); 690 #endif /* CFG_CMD_DHCP */ 691 NetSendPacket(NetTxPacket, pktlen); 692 } 693 694 #if (CONFIG_COMMANDS & CFG_CMD_DHCP) 695 static void DhcpOptionsProcess(uchar *popt) 696 { 697 uchar *end = popt + BOOTP_HDR_SIZE; 698 int oplen, size; 699 700 while ( popt < end && *popt != 0xff ) { 701 oplen = *(popt + 1); 702 switch(*popt) { 703 case 1: 704 NetCopyIP(&NetOurSubnetMask, (popt+2)); 705 break; 706 case 3: 707 NetCopyIP(&NetOurGatewayIP, (popt+2)); 708 break; 709 case 6: 710 NetCopyIP(&NetOurDNSIP, (popt+2)); 711 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS2) 712 if ( *(popt+1) > 4 ) { 713 NetCopyIP(&NetOurDNS2IP, (popt+2+4)); 714 } 715 #endif 716 break; 717 case 12: 718 size = truncate_sz ("Host Name", 719 sizeof(NetOurHostName), 720 oplen); 721 memcpy(&NetOurHostName, popt+2, size); 722 NetOurHostName[size] = 0 ; 723 break; 724 case 15: /* Ignore Domain Name Option */ 725 break; 726 case 17: 727 size = truncate_sz ("Root Path", 728 sizeof(NetOurRootPath), 729 oplen); 730 memcpy(&NetOurRootPath, popt+2, size); 731 NetOurRootPath[size] = 0 ; 732 break; 733 case 51: 734 NetCopyLong (&dhcp_leasetime, (ulong *)(popt + 2)); 735 break; 736 case 53: /* Ignore Message Type Option */ 737 break; 738 case 54: 739 NetCopyIP(&NetDHCPServerIP, (popt+2)); 740 break; 741 case 58: /* Ignore Renewal Time Option */ 742 break; 743 case 59: /* Ignore Rebinding Time Option */ 744 break; 745 default: 746 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX) 747 if (dhcp_vendorex_proc(popt)) 748 break; 749 #endif 750 printf("*** Unhandled DHCP Option in OFFER/ACK: %d\n", 751 *popt); 752 break; 753 } 754 popt += oplen + 2; /* Process next option */ 755 } 756 } 757 758 static int DhcpMessageType(unsigned char *popt) 759 { 760 if (NetReadLong((ulong*)popt) != htonl(BOOTP_VENDOR_MAGIC)) 761 return -1; 762 763 popt += 4; 764 while ( *popt != 0xff ) { 765 if ( *popt == 53 ) /* DHCP Message Type */ 766 return *(popt + 2); 767 popt += *(popt + 1) + 2; /* Scan through all options */ 768 } 769 return -1; 770 } 771 772 static void DhcpSendRequestPkt(Bootp_t *bp_offer) 773 { 774 volatile uchar *pkt, *iphdr; 775 Bootp_t *bp; 776 int pktlen, iplen, extlen; 777 IPaddr_t OfferedIP; 778 779 debug ("DhcpSendRequestPkt: Sending DHCPREQUEST\n"); 780 pkt = NetTxPacket; 781 memset ((void*)pkt, 0, PKTSIZE); 782 783 NetSetEther(pkt, NetBcastAddr, PROT_IP); 784 pkt += ETHER_HDR_SIZE; 785 786 iphdr = pkt; /* We'll need this later to set proper pkt size */ 787 pkt += IP_HDR_SIZE; 788 789 bp = (Bootp_t *)pkt; 790 bp->bp_op = OP_BOOTREQUEST; 791 bp->bp_htype = HWT_ETHER; 792 bp->bp_hlen = HWL_ETHER; 793 bp->bp_hops = 0; 794 bp->bp_secs = htons(get_timer(0) / CFG_HZ); 795 NetCopyIP(&bp->bp_ciaddr, &bp_offer->bp_ciaddr); /* both in network byte order */ 796 NetCopyIP(&bp->bp_yiaddr, &bp_offer->bp_yiaddr); 797 NetCopyIP(&bp->bp_siaddr, &bp_offer->bp_siaddr); 798 NetCopyIP(&bp->bp_giaddr, &bp_offer->bp_giaddr); 799 memcpy (bp->bp_chaddr, NetOurEther, 6); 800 801 /* 802 * ID is the id of the OFFER packet 803 */ 804 805 NetCopyLong(&bp->bp_id, &bp_offer->bp_id); 806 807 /* 808 * Copy options from OFFER packet if present 809 */ 810 NetCopyIP(&OfferedIP, &bp->bp_yiaddr); 811 extlen = DhcpExtended(bp->bp_vend, DHCP_REQUEST, NetDHCPServerIP, OfferedIP); 812 813 pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + extlen; 814 iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen; 815 NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); 816 817 debug ("Transmitting DHCPREQUEST packet: len = %d\n", pktlen); 818 NetSendPacket(NetTxPacket, pktlen); 819 } 820 821 /* 822 * Handle DHCP received packets. 823 */ 824 static void 825 DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len) 826 { 827 Bootp_t *bp = (Bootp_t *)pkt; 828 829 debug ("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n", 830 src, dest, len, dhcp_state); 831 832 if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */ 833 return; 834 835 debug ("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n", 836 src, dest, len, dhcp_state); 837 838 switch (dhcp_state) { 839 case SELECTING: 840 /* 841 * Wait an appropriate time for any potential DHCPOFFER packets 842 * to arrive. Then select one, and generate DHCPREQUEST response. 843 * If filename is in format we recognize, assume it is a valid 844 * OFFER from a server we want. 845 */ 846 debug ("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file); 847 #ifdef CFG_BOOTFILE_PREFIX 848 if (strncmp(bp->bp_file, 849 CFG_BOOTFILE_PREFIX, 850 strlen(CFG_BOOTFILE_PREFIX)) == 0 ) { 851 #endif /* CFG_BOOTFILE_PREFIX */ 852 853 debug ("TRANSITIONING TO REQUESTING STATE\n"); 854 dhcp_state = REQUESTING; 855 856 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 857 DhcpOptionsProcess(&bp->bp_vend[4]); 858 859 BootpCopyNetParams(bp); /* Store net params from reply */ 860 861 NetSetTimeout(TIMEOUT * CFG_HZ, BootpTimeout); 862 DhcpSendRequestPkt(bp); 863 #ifdef CFG_BOOTFILE_PREFIX 864 } 865 #endif /* CFG_BOOTFILE_PREFIX */ 866 867 return; 868 break; 869 case REQUESTING: 870 debug ("DHCP State: REQUESTING\n"); 871 872 if ( DhcpMessageType(bp->bp_vend) == DHCP_ACK ) { 873 char *s; 874 875 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 876 DhcpOptionsProcess(&bp->bp_vend[4]); 877 BootpCopyNetParams(bp); /* Store net params from reply */ 878 dhcp_state = BOUND; 879 printf("DHCP client bound to address "); 880 print_IPaddr(NetOurIP); 881 printf("\n"); 882 883 /* Obey the 'autoload' setting */ 884 if (((s = getenv("autoload")) != NULL) && (*s == 'n')) { 885 NetState = NETLOOP_SUCCESS; 886 return; 887 } 888 TftpStart(); 889 return; 890 } 891 break; 892 default: 893 printf("DHCP: INVALID STATE\n"); 894 break; 895 } 896 897 } 898 899 void DhcpRequest(void) 900 { 901 BootpRequest(); 902 } 903 #endif /* CFG_CMD_DHCP */ 904 905 #endif /* CFG_CMD_NET */ 906