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