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 break; 178 case 7: /* Log server - Not yet supported */ 179 break; 180 case 8: /* Cookie/Quote server - Not yet supported */ 181 break; 182 case 9: /* LPR server - Not yet supported */ 183 break; 184 case 10: /* Impress server - Not yet supported */ 185 break; 186 case 11: /* RPL server - Not yet supported */ 187 break; 188 case 12: /* Host name */ 189 if (NetOurHostName[0] == 0) { 190 size = truncate_sz("Host Name", sizeof(NetOurHostName), size); 191 memcpy(&NetOurHostName, ext+2, size); 192 NetOurHostName[size] = 0 ; 193 } 194 break; 195 case 13: /* Boot file size */ 196 if (size == 2) 197 NetBootFileSize = ntohs(*(ushort*)(ext+2)); 198 else if (size == 4) 199 NetBootFileSize = ntohl(*(ulong*)(ext+2)); 200 break; 201 case 14: /* Merit dump file - Not yet supported */ 202 break; 203 case 15: /* Domain name - Not yet supported */ 204 break; 205 case 16: /* Swap server - Not yet supported */ 206 break; 207 case 17: /* Root path */ 208 if (NetOurRootPath[0] == 0) { 209 size = truncate_sz("Root Path", sizeof(NetOurRootPath), size); 210 memcpy(&NetOurRootPath, ext+2, size); 211 NetOurRootPath[size] = 0 ; 212 } 213 break; 214 case 18: /* Extension path - Not yet supported */ 215 /* 216 * This can be used to send the information of the 217 * vendor area in another file that the client can 218 * access via TFTP. 219 */ 220 break; 221 /* IP host layer fields */ 222 case 40: /* NIS Domain name */ 223 if (NetOurNISDomain[0] == 0) { 224 size = truncate_sz ("NIS Domain Name", 225 sizeof(NetOurNISDomain), 226 size); 227 memcpy(&NetOurNISDomain, ext+2, size); 228 NetOurNISDomain[size] = 0 ; 229 } 230 break; 231 /* Application layer fields */ 232 case 43: /* Vendor specific info - Not yet supported */ 233 /* 234 * Binary information to exchange specific 235 * product information. 236 */ 237 break; 238 /* Reserved (custom) fields (128..254) */ 239 } 240 } 241 242 static void BootpVendorProcess(u8 *ext, int size) 243 { 244 u8 *end = ext + size ; 245 246 debug_ext ("[BOOTP] Checking extension (%d bytes)...\n", size); 247 248 while ((ext < end) && (*ext != 0xff)) { 249 if (*ext == 0) { 250 ext ++ ; 251 } else { 252 u8 *opt = ext ; 253 ext += ext[1] + 2 ; 254 if (ext <= end) 255 BootpVendorFieldProcess (opt) ; 256 } 257 } 258 259 #ifdef DEBUG_BOOTP_EXT 260 printf("[BOOTP] Received fields: \n"); 261 if (NetOurSubnetMask) { 262 puts ("NetOurSubnetMask : "); 263 print_IPaddr (NetOurSubnetMask); 264 putc('\n'); 265 } 266 267 if (NetOurGatewayIP) { 268 puts ("NetOurGatewayIP : "); 269 print_IPaddr (NetOurGatewayIP); 270 putc('\n'); 271 } 272 273 if (NetBootFileSize) { 274 printf("NetBootFileSize : %d\n", NetBootFileSize); 275 } 276 277 if (NetOurHostName[0]) { 278 printf("NetOurHostName : %s\n", NetOurHostName); 279 } 280 281 if (NetOurRootPath[0]) { 282 printf("NetOurRootPath : %s\n", NetOurRootPath); 283 } 284 285 if (NetOurNISDomain[0]) { 286 printf("NetOurNISDomain : %s\n", NetOurNISDomain); 287 } 288 289 if (NetBootFileSize) { 290 printf("NetBootFileSize: %d\n", NetBootFileSize); 291 } 292 #endif /* DEBUG_BOOTP_EXT */ 293 } 294 295 /* 296 * Handle a BOOTP received packet. 297 */ 298 static void 299 BootpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len) 300 { 301 Bootp_t *bp; 302 char *s; 303 304 debug ("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%d)\n", 305 src, dest, len, sizeof (Bootp_t)); 306 307 bp = (Bootp_t *)pkt; 308 309 if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */ 310 return; 311 312 /* 313 * Got a good BOOTP reply. Copy the data into our variables. 314 */ 315 #ifdef CONFIG_STATUS_LED 316 status_led_set (STATUS_LED_BOOT, STATUS_LED_OFF); 317 #endif 318 319 BootpCopyNetParams(bp); /* Store net parameters from reply */ 320 321 /* Retrieve extended information (we must parse the vendor area) */ 322 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 323 BootpVendorProcess(&bp->bp_vend[4], len); 324 325 NetSetTimeout(0, (thand_f *)0); 326 327 debug ("Got good BOOTP\n"); 328 329 if (((s = getenv("autoload")) != NULL) && (*s == 'n')) { 330 /* 331 * Just use BOOTP to configure system; 332 * Do not use TFTP to load the bootfile. 333 */ 334 NetState = NETLOOP_SUCCESS; 335 return; 336 } 337 338 TftpStart(); 339 } 340 #endif /* !CFG_CMD_DHCP */ 341 342 /* 343 * Timeout on BOOTP/DHCP request. 344 */ 345 static void 346 BootpTimeout(void) 347 { 348 if (BootpTry >= TIMEOUT_COUNT) { 349 puts ("\nRetry count exceeded; starting again\n"); 350 NetStartAgain (); 351 } else { 352 NetSetTimeout (TIMEOUT * CFG_HZ, BootpTimeout); 353 BootpRequest (); 354 } 355 } 356 357 /* 358 * Initialize BOOTP extension fields in the request. 359 */ 360 #if (CONFIG_COMMANDS & CFG_CMD_DHCP) 361 static int DhcpExtended(u8 *e, int message_type, IPaddr_t ServerID, IPaddr_t RequestedIP) 362 { 363 u8 *start = e ; 364 u8 *cnt; 365 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX) 366 u8 *x; 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 } 404 405 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX) 406 if ((x = dhcp_vendorex_prep (e))) 407 return x - start ; 408 #endif 409 410 *e++ = 55; /* Parameter Request List */ 411 cnt = e++; /* Pointer to count of requested items */ 412 *cnt = 0; 413 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SUBNETMASK) 414 *e++ = 1; /* Subnet Mask */ 415 *cnt += 1; 416 #endif 417 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_GATEWAY) 418 *e++ = 3; /* Router Option */ 419 *cnt += 1; 420 #endif 421 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS) 422 *e++ = 6; /* DNS Server(s) */ 423 *cnt += 1; 424 #endif 425 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_HOSTNAME) 426 *e++ = 12; /* Hostname */ 427 *cnt += 1; 428 #endif 429 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTFILESIZE) 430 *e++ = 13; /* Boot File Size */ 431 *cnt += 1; 432 #endif 433 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTPATH) 434 *e++ = 17; /* Boot path */ 435 *cnt += 1; 436 #endif 437 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_NISDOMAIN) 438 *e++ = 40; /* NIS Domain name request */ 439 *cnt += 1; 440 #endif 441 *e++ = 255; /* End of the list */ 442 443 /* Pad to minimal length */ 444 #ifdef CONFIG_DHCP_MIN_EXT_LEN 445 while ((e - start) <= CONFIG_DHCP_MIN_EXT_LEN) 446 *e++ = 0; 447 #endif 448 449 return e - start ; 450 } 451 452 #else /* CFG_CMD_DHCP */ 453 /* 454 * Warning: no field size check - change CONFIG_BOOTP_MASK at your own risk! 455 */ 456 static int BootpExtended (u8 *e) 457 { 458 u8 *start = e ; 459 460 *e++ = 99; /* RFC1048 Magic Cookie */ 461 *e++ = 130; 462 *e++ = 83; 463 *e++ = 99; 464 465 #if (CONFIG_COMMANDS & CFG_CMD_DHCP) 466 *e++ = 53; /* DHCP Message Type */ 467 *e++ = 1; 468 *e++ = DHCP_DISCOVER; 469 470 *e++ = 57; /* Maximum DHCP Message Size */ 471 *e++ = 2; 472 *e++ = (576-312+OPT_SIZE) >> 16; 473 *e++ = (576-312+OPT_SIZE) & 0xff; 474 #endif /* CFG_CMD_DHCP */ 475 476 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SUBNETMASK) 477 *e++ = 1; /* Subnet mask request */ 478 *e++ = 4; 479 e += 4; 480 #endif 481 482 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_GATEWAY) 483 *e++ = 3; /* Default gateway request */ 484 *e++ = 4; 485 e += 4; 486 #endif 487 488 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS) 489 *e++ = 6; /* Domain Name Server */ 490 *e++ = 4; 491 e += 4; 492 #endif 493 494 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_HOSTNAME) 495 *e++ = 12; /* Host name request */ 496 *e++ = 32; 497 e += 32; 498 #endif 499 500 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTFILESIZE) 501 *e++ = 13; /* Boot file size */ 502 *e++ = 2; 503 e += 2; 504 #endif 505 506 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTPATH) 507 *e++ = 17; /* Boot path */ 508 *e++ = 32; 509 e += 32; 510 #endif 511 512 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_NISDOMAIN) 513 *e++ = 40; /* NIS Domain name request */ 514 *e++ = 32; 515 e += 32; 516 #endif 517 518 *e++ = 255; /* End of the list */ 519 520 return e - start ; 521 } 522 #endif /* CFG_CMD_DHCP */ 523 524 void 525 BootpRequest (void) 526 { 527 volatile uchar *pkt, *iphdr; 528 Bootp_t *bp; 529 int ext_len, pktlen, iplen; 530 531 #if (CONFIG_COMMANDS & CFG_CMD_DHCP) 532 dhcp_state = INIT; 533 #endif 534 535 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */ 536 unsigned char bi_enetaddr[6]; 537 int reg; 538 char *e,*s; 539 uchar tmp[64]; 540 ulong tst1, tst2, sum, m_mask, m_value = 0; 541 542 if (BootpTry ==0) { 543 /* get our mac */ 544 reg = getenv_r ("ethaddr", tmp, sizeof(tmp)); 545 s = (reg > 0) ? tmp : NULL; 546 547 for (reg=0; reg<6; ++reg) { 548 bi_enetaddr[reg] = s ? simple_strtoul(s, &e, 16) : 0; 549 if (s) { 550 s = (*e) ? e+1 : e; 551 } 552 } 553 #ifdef DEBUG 554 printf("BootpRequest => Our Mac: "); 555 for (reg=0; reg<6; reg++) { 556 printf ("%x%c", 557 bi_enetaddr[reg], 558 reg==5 ? '\n' : ':'); 559 } 560 #endif /* DEBUG */ 561 562 /* Mac-Manipulation 2 get seed1 */ 563 tst1=0; 564 tst2=0; 565 for (reg=2; reg<6; reg++) { 566 tst1 = tst1 << 8; 567 tst1 = tst1 | bi_enetaddr[reg]; 568 } 569 for (reg=0; reg<2; reg++) { 570 tst2 = tst2 | bi_enetaddr[reg]; 571 tst2 = tst2 << 8; 572 } 573 574 seed1 = tst1^tst2; 575 576 /* Mirror seed1*/ 577 m_mask=0x1; 578 for (reg=1;reg<=32;reg++) { 579 m_value |= (m_mask & seed1); 580 seed1 = seed1 >> 1; 581 m_value = m_value << 1; 582 } 583 seed1 = m_value; 584 seed2 = 0xB78D0945; 585 } 586 587 /* Random Number Generator */ 588 589 for (reg=0;reg<=0;reg++) { 590 sum = seed1 + seed2; 591 if (sum < seed1 || sum < seed2) 592 sum++; 593 seed2 = seed1; 594 seed1 = sum; 595 596 if (BootpTry<=2) { /* Start with max 1024 * 1ms */ 597 sum = sum >> (22-BootpTry); 598 } else { /*After 3rd BOOTP request max 8192 * 1ms */ 599 sum = sum >> 19; 600 } 601 } 602 603 printf ("Random delay: %ld ms...\n", sum); 604 for (reg=0; reg <sum; reg++) { 605 udelay(1000); /*Wait 1ms*/ 606 } 607 #endif /* CONFIG_BOOTP_RANDOM_DELAY */ 608 609 printf("BOOTP broadcast %d\n", ++BootpTry); 610 pkt = NetTxPacket; 611 memset ((void*)pkt, 0, PKTSIZE); 612 613 NetSetEther(pkt, NetBcastAddr, PROT_IP); 614 pkt += ETHER_HDR_SIZE; 615 616 /* 617 * Next line results in incorrect packet size being transmitted, resulting 618 * in errors in some DHCP servers, reporting missing bytes. Size must be 619 * set in packet header after extension length has been determined. 620 * C. Hallinan, DS4.COM, Inc. 621 */ 622 /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */ 623 iphdr = pkt; /* We need this later for NetSetIP() */ 624 pkt += IP_HDR_SIZE; 625 626 bp = (Bootp_t *)pkt; 627 bp->bp_op = OP_BOOTREQUEST; 628 bp->bp_htype = HWT_ETHER; 629 bp->bp_hlen = HWL_ETHER; 630 bp->bp_hops = 0; 631 bp->bp_secs = htons(get_timer(0) / CFG_HZ); 632 NetWriteIP(&bp->bp_ciaddr, 0); 633 NetWriteIP(&bp->bp_yiaddr, 0); 634 NetWriteIP(&bp->bp_siaddr, 0); 635 NetWriteIP(&bp->bp_giaddr, 0); 636 memcpy (bp->bp_chaddr, NetOurEther, 6); 637 copy_filename (bp->bp_file, BootFile, sizeof(bp->bp_file)); 638 639 /* Request additional information from the BOOTP/DHCP server */ 640 #if (CONFIG_COMMANDS & CFG_CMD_DHCP) 641 ext_len = DhcpExtended(bp->bp_vend, DHCP_DISCOVER, 0, 0); 642 #else 643 ext_len = BootpExtended(bp->bp_vend); 644 #endif /* CFG_CMD_DHCP */ 645 646 /* 647 * Bootp ID is the lower 4 bytes of our ethernet address 648 * plus the current time in HZ. 649 */ 650 BootpID = ((ulong)NetOurEther[2] << 24) 651 | ((ulong)NetOurEther[3] << 16) 652 | ((ulong)NetOurEther[4] << 8) 653 | (ulong)NetOurEther[5]; 654 BootpID += get_timer(0); 655 BootpID = htonl(BootpID); 656 NetCopyLong(&bp->bp_id, &BootpID); 657 658 /* 659 * Calculate proper packet lengths taking into account the 660 * variable size of the options field 661 */ 662 pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + ext_len; 663 iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len; 664 NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); 665 NetSetTimeout(SELECT_TIMEOUT * CFG_HZ, BootpTimeout); 666 667 #if (CONFIG_COMMANDS & CFG_CMD_DHCP) 668 dhcp_state = SELECTING; 669 NetSetHandler(DhcpHandler); 670 #else 671 NetSetHandler(BootpHandler); 672 #endif /* CFG_CMD_DHCP */ 673 NetSendPacket(NetTxPacket, pktlen); 674 } 675 676 #if (CONFIG_COMMANDS & CFG_CMD_DHCP) 677 static void DhcpOptionsProcess(uchar *popt) 678 { 679 uchar *end = popt + BOOTP_HDR_SIZE; 680 int oplen, size; 681 682 while ( popt < end && *popt != 0xff ) { 683 oplen = *(popt + 1); 684 switch(*popt) { 685 case 1: 686 NetCopyIP(&NetOurSubnetMask, (popt+2)); 687 break; 688 case 3: 689 NetCopyIP(&NetOurGatewayIP, (popt+2)); 690 break; 691 case 6: 692 NetCopyIP(&NetOurDNSIP, (popt+2)); 693 break; 694 case 12: 695 size = truncate_sz ("Host Name", 696 sizeof(NetOurHostName), 697 oplen); 698 memcpy(&NetOurHostName, popt+2, size); 699 NetOurHostName[size] = 0 ; 700 break; 701 case 15: /* Ignore Domain Name Option */ 702 break; 703 case 17: 704 size = truncate_sz ("Root Path", 705 sizeof(NetOurRootPath), 706 oplen); 707 memcpy(&NetOurRootPath, popt+2, size); 708 NetOurRootPath[size] = 0 ; 709 break; 710 case 51: 711 NetCopyLong (&dhcp_leasetime, (ulong *)(popt + 2)); 712 break; 713 case 53: /* Ignore Message Type Option */ 714 break; 715 case 54: 716 NetCopyIP(&NetDHCPServerIP, (popt+2)); 717 break; 718 case 58: /* Ignore Renewal Time Option */ 719 break; 720 case 59: /* Ignore Rebinding Time Option */ 721 break; 722 default: 723 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX) 724 if (dhcp_vendorex_proc(popt)) 725 break; 726 #endif 727 printf("*** Unhandled DHCP Option in OFFER/ACK: %d\n", 728 *popt); 729 break; 730 } 731 popt += oplen + 2; /* Process next option */ 732 } 733 } 734 735 static int DhcpMessageType(unsigned char *popt) 736 { 737 if (NetReadLong((ulong*)popt) != htonl(BOOTP_VENDOR_MAGIC)) 738 return -1; 739 740 popt += 4; 741 while ( *popt != 0xff ) { 742 if ( *popt == 53 ) /* DHCP Message Type */ 743 return *(popt + 2); 744 popt += *(popt + 1) + 2; /* Scan through all options */ 745 } 746 return -1; 747 } 748 749 static void DhcpSendRequestPkt(Bootp_t *bp_offer) 750 { 751 volatile uchar *pkt, *iphdr; 752 Bootp_t *bp; 753 int pktlen, iplen, extlen; 754 IPaddr_t OfferedIP; 755 756 debug ("DhcpSendRequestPkt: Sending DHCPREQUEST\n"); 757 pkt = NetTxPacket; 758 memset ((void*)pkt, 0, PKTSIZE); 759 760 NetSetEther(pkt, NetBcastAddr, PROT_IP); 761 pkt += ETHER_HDR_SIZE; 762 763 iphdr = pkt; /* We'll need this later to set proper pkt size */ 764 pkt += IP_HDR_SIZE; 765 766 bp = (Bootp_t *)pkt; 767 bp->bp_op = OP_BOOTREQUEST; 768 bp->bp_htype = HWT_ETHER; 769 bp->bp_hlen = HWL_ETHER; 770 bp->bp_hops = 0; 771 bp->bp_secs = htons(get_timer(0) / CFG_HZ); 772 NetCopyIP(&bp->bp_ciaddr, &bp_offer->bp_ciaddr); /* both in network byte order */ 773 NetCopyIP(&bp->bp_yiaddr, &bp_offer->bp_yiaddr); 774 NetCopyIP(&bp->bp_siaddr, &bp_offer->bp_siaddr); 775 NetCopyIP(&bp->bp_giaddr, &bp_offer->bp_giaddr); 776 memcpy (bp->bp_chaddr, NetOurEther, 6); 777 778 /* 779 * ID is the id of the OFFER packet 780 */ 781 782 NetCopyLong(&bp->bp_id, &bp_offer->bp_id); 783 784 /* 785 * Copy options from OFFER packet if present 786 */ 787 NetCopyIP(&OfferedIP, &bp->bp_yiaddr); 788 extlen = DhcpExtended(bp->bp_vend, DHCP_REQUEST, NetDHCPServerIP, OfferedIP); 789 790 pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + extlen; 791 iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen; 792 NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); 793 794 debug ("Transmitting DHCPREQUEST packet: len = %d\n", pktlen); 795 NetSendPacket(NetTxPacket, pktlen); 796 } 797 798 /* 799 * Handle DHCP received packets. 800 */ 801 static void 802 DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len) 803 { 804 Bootp_t *bp = (Bootp_t *)pkt; 805 806 debug ("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n", 807 src, dest, len, dhcp_state); 808 809 if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */ 810 return; 811 812 debug ("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n", 813 src, dest, len, dhcp_state); 814 815 switch (dhcp_state) { 816 case SELECTING: 817 /* 818 * Wait an appropriate time for any potential DHCPOFFER packets 819 * to arrive. Then select one, and generate DHCPREQUEST response. 820 * If filename is in format we recognize, assume it is a valid 821 * OFFER from a server we want. 822 */ 823 debug ("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file); 824 #ifdef CFG_BOOTFILE_PREFIX 825 if (strncmp(bp->bp_file, 826 CFG_BOOTFILE_PREFIX, 827 strlen(CFG_BOOTFILE_PREFIX)) == 0 ) { 828 #endif /* CFG_BOOTFILE_PREFIX */ 829 830 debug ("TRANSITIONING TO REQUESTING STATE\n"); 831 dhcp_state = REQUESTING; 832 833 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 834 DhcpOptionsProcess(&bp->bp_vend[4]); 835 836 BootpCopyNetParams(bp); /* Store net params from reply */ 837 838 NetSetTimeout(TIMEOUT * CFG_HZ, BootpTimeout); 839 DhcpSendRequestPkt(bp); 840 #ifdef CFG_BOOTFILE_PREFIX 841 } 842 #endif /* CFG_BOOTFILE_PREFIX */ 843 844 return; 845 break; 846 case REQUESTING: 847 debug ("DHCP State: REQUESTING\n"); 848 849 if ( DhcpMessageType(bp->bp_vend) == DHCP_ACK ) { 850 char *s; 851 852 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 853 DhcpOptionsProcess(&bp->bp_vend[4]); 854 BootpCopyNetParams(bp); /* Store net params from reply */ 855 dhcp_state = BOUND; 856 printf("DHCP client bound to address "); 857 print_IPaddr(NetOurIP); 858 printf("\n"); 859 860 /* Obey the 'autoload' setting */ 861 if (((s = getenv("autoload")) != NULL) && (*s == 'n')) { 862 NetState = NETLOOP_SUCCESS; 863 return; 864 } 865 TftpStart(); 866 return; 867 } 868 break; 869 default: 870 printf("DHCP: INVALID STATE\n"); 871 break; 872 } 873 874 } 875 876 void DhcpRequest(void) 877 { 878 BootpRequest(); 879 } 880 #endif /* CFG_CMD_DHCP */ 881 882 #endif /* CFG_CMD_NET */ 883