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 NetCopyIP(&NetOurIP, &bp->bp_yiaddr); 121 NetCopyIP(&NetServerIP, &bp->bp_siaddr); 122 memcpy (NetServerEther, ((Ethernet_t *)NetRxPkt)->et_src, 6); 123 copy_filename (BootFile, bp->bp_file, sizeof(BootFile)); 124 125 debug ("Bootfile: %s\n", BootFile); 126 127 /* Propagate to environment: 128 * don't delete exising entry when BOOTP / DHCP reply does 129 * not contain a new value 130 */ 131 if (*BootFile) { 132 setenv ("bootfile", BootFile); 133 } 134 } 135 136 static int truncate_sz (const char *name, int maxlen, int curlen) 137 { 138 if (curlen >= maxlen) { 139 printf("*** WARNING: %s is too long (%d - max: %d) - truncated\n", 140 name, curlen, maxlen); 141 curlen = maxlen - 1; 142 } 143 return (curlen); 144 } 145 146 #if !(CONFIG_COMMANDS & CFG_CMD_DHCP) 147 148 static void BootpVendorFieldProcess (u8 * ext) 149 { 150 int size = *(ext + 1); 151 152 debug_ext ("[BOOTP] Processing extension %d... (%d bytes)\n", *ext, 153 *(ext + 1)); 154 155 NetBootFileSize = 0; 156 157 switch (*ext) { 158 /* Fixed length fields */ 159 case 1: /* Subnet mask */ 160 if (NetOurSubnetMask == 0) 161 NetCopyIP (&NetOurSubnetMask, (IPaddr_t *) (ext + 2)); 162 break; 163 case 2: /* Time offset - Not yet supported */ 164 break; 165 /* Variable length fields */ 166 case 3: /* Gateways list */ 167 if (NetOurGatewayIP == 0) { 168 NetCopyIP (&NetOurGatewayIP, (IPaddr_t *) (ext + 2)); 169 } 170 break; 171 case 4: /* Time server - Not yet supported */ 172 break; 173 case 5: /* IEN-116 name server - Not yet supported */ 174 break; 175 case 6: 176 if (NetOurDNSIP == 0) { 177 NetCopyIP (&NetOurDNSIP, (IPaddr_t *) (ext + 2)); 178 } 179 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS2) 180 if ((NetOurDNS2IP == 0) && (size > 4)) { 181 NetCopyIP (&NetOurDNS2IP, (IPaddr_t *) (ext + 2 + 4)); 182 } 183 #endif 184 break; 185 case 7: /* Log server - Not yet supported */ 186 break; 187 case 8: /* Cookie/Quote server - Not yet supported */ 188 break; 189 case 9: /* LPR server - Not yet supported */ 190 break; 191 case 10: /* Impress server - Not yet supported */ 192 break; 193 case 11: /* RPL server - Not yet supported */ 194 break; 195 case 12: /* Host name */ 196 if (NetOurHostName[0] == 0) { 197 size = truncate_sz ("Host Name", sizeof (NetOurHostName), size); 198 memcpy (&NetOurHostName, ext + 2, size); 199 NetOurHostName[size] = 0; 200 } 201 break; 202 case 13: /* Boot file size */ 203 if (size == 2) 204 NetBootFileSize = ntohs (*(ushort *) (ext + 2)); 205 else if (size == 4) 206 NetBootFileSize = ntohl (*(ulong *) (ext + 2)); 207 break; 208 case 14: /* Merit dump file - Not yet supported */ 209 break; 210 case 15: /* Domain name - Not yet supported */ 211 break; 212 case 16: /* Swap server - Not yet supported */ 213 break; 214 case 17: /* Root path */ 215 if (NetOurRootPath[0] == 0) { 216 size = truncate_sz ("Root Path", sizeof (NetOurRootPath), size); 217 memcpy (&NetOurRootPath, ext + 2, size); 218 NetOurRootPath[size] = 0; 219 } 220 break; 221 case 18: /* Extension path - Not yet supported */ 222 /* 223 * This can be used to send the information of the 224 * vendor area in another file that the client can 225 * access via TFTP. 226 */ 227 break; 228 /* IP host layer fields */ 229 case 40: /* NIS Domain name */ 230 if (NetOurNISDomain[0] == 0) { 231 size = truncate_sz ("NIS Domain Name", sizeof (NetOurNISDomain), 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; 258 259 ext += ext[1] + 2; 260 if (ext <= end) 261 BootpVendorFieldProcess (opt); 262 } 263 } 264 265 #ifdef DEBUG_BOOTP_EXT 266 printf ("[BOOTP] Received fields: \n"); 267 if (NetOurSubnetMask) { 268 puts ("NetOurSubnetMask : "); 269 print_IPaddr (NetOurSubnetMask); 270 putc ('\n'); 271 } 272 273 if (NetOurGatewayIP) { 274 puts ("NetOurGatewayIP : "); 275 print_IPaddr (NetOurGatewayIP); 276 putc ('\n'); 277 } 278 279 if (NetBootFileSize) { 280 printf ("NetBootFileSize : %d\n", NetBootFileSize); 281 } 282 283 if (NetOurHostName[0]) { 284 printf ("NetOurHostName : %s\n", NetOurHostName); 285 } 286 287 if (NetOurRootPath[0]) { 288 printf ("NetOurRootPath : %s\n", NetOurRootPath); 289 } 290 291 if (NetOurNISDomain[0]) { 292 printf ("NetOurNISDomain : %s\n", NetOurNISDomain); 293 } 294 295 if (NetBootFileSize) { 296 printf ("NetBootFileSize: %d\n", NetBootFileSize); 297 } 298 #endif /* DEBUG_BOOTP_EXT */ 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) { 335 if (*s == 'n') { 336 /* 337 * Just use BOOTP to configure system; 338 * Do not use TFTP to load the bootfile. 339 */ 340 NetState = NETLOOP_SUCCESS; 341 return; 342 } else if (strcmp(s, "NFS") == 0) { 343 /* 344 * Use NFS to load the bootfile. 345 */ 346 NfsStart(); 347 return; 348 } 349 } 350 351 TftpStart(); 352 } 353 #endif /* !CFG_CMD_DHCP */ 354 355 /* 356 * Timeout on BOOTP/DHCP request. 357 */ 358 static void 359 BootpTimeout(void) 360 { 361 if (BootpTry >= TIMEOUT_COUNT) { 362 puts ("\nRetry count exceeded; starting again\n"); 363 NetStartAgain (); 364 } else { 365 NetSetTimeout (TIMEOUT * CFG_HZ, BootpTimeout); 366 BootpRequest (); 367 } 368 } 369 370 /* 371 * Initialize BOOTP extension fields in the request. 372 */ 373 #if (CONFIG_COMMANDS & CFG_CMD_DHCP) 374 static int DhcpExtended (u8 * e, int message_type, IPaddr_t ServerID, IPaddr_t RequestedIP) 375 { 376 u8 *start = e; 377 u8 *cnt; 378 379 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX) 380 u8 *x; 381 #endif 382 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SEND_HOSTNAME) 383 uchar *hostname; 384 #endif 385 386 *e++ = 99; /* RFC1048 Magic Cookie */ 387 *e++ = 130; 388 *e++ = 83; 389 *e++ = 99; 390 391 *e++ = 53; /* DHCP Message Type */ 392 *e++ = 1; 393 *e++ = message_type; 394 395 *e++ = 57; /* Maximum DHCP Message Size */ 396 *e++ = 2; 397 *e++ = (576 - 312 + OPT_SIZE) >> 8; 398 *e++ = (576 - 312 + OPT_SIZE) & 0xff; 399 400 if (ServerID) { 401 int tmp = ntohl (ServerID); 402 403 *e++ = 54; /* ServerID */ 404 *e++ = 4; 405 *e++ = tmp >> 24; 406 *e++ = tmp >> 16; 407 *e++ = tmp >> 8; 408 *e++ = tmp & 0xff; 409 } 410 411 if (RequestedIP) { 412 int tmp = ntohl (RequestedIP); 413 414 *e++ = 50; /* Requested IP */ 415 *e++ = 4; 416 *e++ = tmp >> 24; 417 *e++ = tmp >> 16; 418 *e++ = tmp >> 8; 419 *e++ = tmp & 0xff; 420 } 421 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SEND_HOSTNAME) 422 if ((hostname = getenv ("hostname"))) { 423 int hostnamelen = strlen (hostname); 424 425 *e++ = 12; /* Hostname */ 426 *e++ = hostnamelen; 427 memcpy (e, hostname, hostnamelen); 428 e += hostnamelen; 429 } 430 #endif 431 432 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX) 433 if ((x = dhcp_vendorex_prep (e))) 434 return x - start; 435 #endif 436 437 *e++ = 55; /* Parameter Request List */ 438 cnt = e++; /* Pointer to count of requested items */ 439 *cnt = 0; 440 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SUBNETMASK) 441 *e++ = 1; /* Subnet Mask */ 442 *cnt += 1; 443 #endif 444 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_GATEWAY) 445 *e++ = 3; /* Router Option */ 446 *cnt += 1; 447 #endif 448 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS) 449 *e++ = 6; /* DNS Server(s) */ 450 *cnt += 1; 451 #endif 452 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_HOSTNAME) 453 *e++ = 12; /* Hostname */ 454 *cnt += 1; 455 #endif 456 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTFILESIZE) 457 *e++ = 13; /* Boot File Size */ 458 *cnt += 1; 459 #endif 460 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTPATH) 461 *e++ = 17; /* Boot path */ 462 *cnt += 1; 463 #endif 464 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_NISDOMAIN) 465 *e++ = 40; /* NIS Domain name request */ 466 *cnt += 1; 467 #endif 468 *e++ = 255; /* End of the list */ 469 470 /* Pad to minimal length */ 471 #ifdef CONFIG_DHCP_MIN_EXT_LEN 472 while ((e - start) <= CONFIG_DHCP_MIN_EXT_LEN) 473 *e++ = 0; 474 #endif 475 476 return e - start; 477 } 478 479 #else /* CFG_CMD_DHCP */ 480 /* 481 * Warning: no field size check - change CONFIG_BOOTP_MASK at your own risk! 482 */ 483 static int BootpExtended (u8 * e) 484 { 485 u8 *start = e; 486 487 *e++ = 99; /* RFC1048 Magic Cookie */ 488 *e++ = 130; 489 *e++ = 83; 490 *e++ = 99; 491 492 #if (CONFIG_COMMANDS & CFG_CMD_DHCP) 493 *e++ = 53; /* DHCP Message Type */ 494 *e++ = 1; 495 *e++ = DHCP_DISCOVER; 496 497 *e++ = 57; /* Maximum DHCP Message Size */ 498 *e++ = 2; 499 *e++ = (576 - 312 + OPT_SIZE) >> 16; 500 *e++ = (576 - 312 + OPT_SIZE) & 0xff; 501 #endif /* CFG_CMD_DHCP */ 502 503 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SUBNETMASK) 504 *e++ = 1; /* Subnet mask request */ 505 *e++ = 4; 506 e += 4; 507 #endif 508 509 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_GATEWAY) 510 *e++ = 3; /* Default gateway request */ 511 *e++ = 4; 512 e += 4; 513 #endif 514 515 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS) 516 *e++ = 6; /* Domain Name Server */ 517 *e++ = 4; 518 e += 4; 519 #endif 520 521 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_HOSTNAME) 522 *e++ = 12; /* Host name request */ 523 *e++ = 32; 524 e += 32; 525 #endif 526 527 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTFILESIZE) 528 *e++ = 13; /* Boot file size */ 529 *e++ = 2; 530 e += 2; 531 #endif 532 533 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTPATH) 534 *e++ = 17; /* Boot path */ 535 *e++ = 32; 536 e += 32; 537 #endif 538 539 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_NISDOMAIN) 540 *e++ = 40; /* NIS Domain name request */ 541 *e++ = 32; 542 e += 32; 543 #endif 544 545 *e++ = 255; /* End of the list */ 546 547 return e - start; 548 } 549 #endif /* CFG_CMD_DHCP */ 550 551 void 552 BootpRequest (void) 553 { 554 volatile uchar *pkt, *iphdr; 555 Bootp_t *bp; 556 int ext_len, pktlen, iplen; 557 558 #if (CONFIG_COMMANDS & CFG_CMD_DHCP) 559 dhcp_state = INIT; 560 #endif 561 562 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */ 563 unsigned char bi_enetaddr[6]; 564 int reg; 565 char *e,*s; 566 uchar tmp[64]; 567 ulong tst1, tst2, sum, m_mask, m_value = 0; 568 569 if (BootpTry ==0) { 570 /* get our mac */ 571 reg = getenv_r ("ethaddr", tmp, sizeof(tmp)); 572 s = (reg > 0) ? tmp : NULL; 573 574 for (reg=0; reg<6; ++reg) { 575 bi_enetaddr[reg] = s ? simple_strtoul(s, &e, 16) : 0; 576 if (s) { 577 s = (*e) ? e+1 : e; 578 } 579 } 580 #ifdef DEBUG 581 printf("BootpRequest => Our Mac: "); 582 for (reg=0; reg<6; reg++) { 583 printf ("%x%c", 584 bi_enetaddr[reg], 585 reg==5 ? '\n' : ':'); 586 } 587 #endif /* DEBUG */ 588 589 /* Mac-Manipulation 2 get seed1 */ 590 tst1=0; 591 tst2=0; 592 for (reg=2; reg<6; reg++) { 593 tst1 = tst1 << 8; 594 tst1 = tst1 | bi_enetaddr[reg]; 595 } 596 for (reg=0; reg<2; reg++) { 597 tst2 = tst2 | bi_enetaddr[reg]; 598 tst2 = tst2 << 8; 599 } 600 601 seed1 = tst1^tst2; 602 603 /* Mirror seed1*/ 604 m_mask=0x1; 605 for (reg=1;reg<=32;reg++) { 606 m_value |= (m_mask & seed1); 607 seed1 = seed1 >> 1; 608 m_value = m_value << 1; 609 } 610 seed1 = m_value; 611 seed2 = 0xB78D0945; 612 } 613 614 /* Random Number Generator */ 615 616 for (reg=0;reg<=0;reg++) { 617 sum = seed1 + seed2; 618 if (sum < seed1 || sum < seed2) 619 sum++; 620 seed2 = seed1; 621 seed1 = sum; 622 623 if (BootpTry<=2) { /* Start with max 1024 * 1ms */ 624 sum = sum >> (22-BootpTry); 625 } else { /*After 3rd BOOTP request max 8192 * 1ms */ 626 sum = sum >> 19; 627 } 628 } 629 630 printf ("Random delay: %ld ms...\n", sum); 631 for (reg=0; reg <sum; reg++) { 632 udelay(1000); /*Wait 1ms*/ 633 } 634 #endif /* CONFIG_BOOTP_RANDOM_DELAY */ 635 636 printf("BOOTP broadcast %d\n", ++BootpTry); 637 pkt = NetTxPacket; 638 memset ((void*)pkt, 0, PKTSIZE); 639 640 NetSetEther(pkt, NetBcastAddr, PROT_IP); 641 pkt += ETHER_HDR_SIZE; 642 643 /* 644 * Next line results in incorrect packet size being transmitted, resulting 645 * in errors in some DHCP servers, reporting missing bytes. Size must be 646 * set in packet header after extension length has been determined. 647 * C. Hallinan, DS4.COM, Inc. 648 */ 649 /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */ 650 iphdr = pkt; /* We need this later for NetSetIP() */ 651 pkt += IP_HDR_SIZE; 652 653 bp = (Bootp_t *)pkt; 654 bp->bp_op = OP_BOOTREQUEST; 655 bp->bp_htype = HWT_ETHER; 656 bp->bp_hlen = HWL_ETHER; 657 bp->bp_hops = 0; 658 bp->bp_secs = htons(get_timer(0) / CFG_HZ); 659 NetWriteIP(&bp->bp_ciaddr, 0); 660 NetWriteIP(&bp->bp_yiaddr, 0); 661 NetWriteIP(&bp->bp_siaddr, 0); 662 NetWriteIP(&bp->bp_giaddr, 0); 663 memcpy (bp->bp_chaddr, NetOurEther, 6); 664 copy_filename (bp->bp_file, BootFile, sizeof(bp->bp_file)); 665 666 /* Request additional information from the BOOTP/DHCP server */ 667 #if (CONFIG_COMMANDS & CFG_CMD_DHCP) 668 ext_len = DhcpExtended(bp->bp_vend, DHCP_DISCOVER, 0, 0); 669 #else 670 ext_len = BootpExtended(bp->bp_vend); 671 #endif /* CFG_CMD_DHCP */ 672 673 /* 674 * Bootp ID is the lower 4 bytes of our ethernet address 675 * plus the current time in HZ. 676 */ 677 BootpID = ((ulong)NetOurEther[2] << 24) 678 | ((ulong)NetOurEther[3] << 16) 679 | ((ulong)NetOurEther[4] << 8) 680 | (ulong)NetOurEther[5]; 681 BootpID += get_timer(0); 682 BootpID = htonl(BootpID); 683 NetCopyLong(&bp->bp_id, &BootpID); 684 685 /* 686 * Calculate proper packet lengths taking into account the 687 * variable size of the options field 688 */ 689 pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + ext_len; 690 iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len; 691 NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); 692 NetSetTimeout(SELECT_TIMEOUT * CFG_HZ, BootpTimeout); 693 694 #if (CONFIG_COMMANDS & CFG_CMD_DHCP) 695 dhcp_state = SELECTING; 696 NetSetHandler(DhcpHandler); 697 #else 698 NetSetHandler(BootpHandler); 699 #endif /* CFG_CMD_DHCP */ 700 NetSendPacket(NetTxPacket, pktlen); 701 } 702 703 #if (CONFIG_COMMANDS & CFG_CMD_DHCP) 704 static void DhcpOptionsProcess (uchar * popt) 705 { 706 uchar *end = popt + BOOTP_HDR_SIZE; 707 int oplen, size; 708 709 while (popt < end && *popt != 0xff) { 710 oplen = *(popt + 1); 711 switch (*popt) { 712 case 1: 713 NetCopyIP (&NetOurSubnetMask, (popt + 2)); 714 break; 715 case 3: 716 NetCopyIP (&NetOurGatewayIP, (popt + 2)); 717 break; 718 case 6: 719 NetCopyIP (&NetOurDNSIP, (popt + 2)); 720 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS2) 721 if (*(popt + 1) > 4) { 722 NetCopyIP (&NetOurDNS2IP, (popt + 2 + 4)); 723 } 724 #endif 725 break; 726 case 12: 727 size = truncate_sz ("Host Name", sizeof (NetOurHostName), oplen); 728 memcpy (&NetOurHostName, popt + 2, size); 729 NetOurHostName[size] = 0; 730 break; 731 case 15: /* Ignore Domain Name Option */ 732 break; 733 case 17: 734 size = truncate_sz ("Root Path", sizeof (NetOurRootPath), oplen); 735 memcpy (&NetOurRootPath, popt + 2, size); 736 NetOurRootPath[size] = 0; 737 break; 738 case 51: 739 NetCopyLong (&dhcp_leasetime, (ulong *) (popt + 2)); 740 break; 741 case 53: /* Ignore Message Type Option */ 742 break; 743 case 54: 744 NetCopyIP (&NetDHCPServerIP, (popt + 2)); 745 break; 746 case 58: /* Ignore Renewal Time Option */ 747 break; 748 case 59: /* Ignore Rebinding Time Option */ 749 break; 750 default: 751 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX) 752 if (dhcp_vendorex_proc (popt)) 753 break; 754 #endif 755 printf ("*** Unhandled DHCP Option in OFFER/ACK: %d\n", *popt); 756 break; 757 } 758 popt += oplen + 2; /* Process next option */ 759 } 760 } 761 762 static int DhcpMessageType(unsigned char *popt) 763 { 764 if (NetReadLong((ulong*)popt) != htonl(BOOTP_VENDOR_MAGIC)) 765 return -1; 766 767 popt += 4; 768 while ( *popt != 0xff ) { 769 if ( *popt == 53 ) /* DHCP Message Type */ 770 return *(popt + 2); 771 popt += *(popt + 1) + 2; /* Scan through all options */ 772 } 773 return -1; 774 } 775 776 static void DhcpSendRequestPkt(Bootp_t *bp_offer) 777 { 778 volatile uchar *pkt, *iphdr; 779 Bootp_t *bp; 780 int pktlen, iplen, extlen; 781 IPaddr_t OfferedIP; 782 783 debug ("DhcpSendRequestPkt: Sending DHCPREQUEST\n"); 784 pkt = NetTxPacket; 785 memset ((void*)pkt, 0, PKTSIZE); 786 787 NetSetEther(pkt, NetBcastAddr, PROT_IP); 788 pkt += ETHER_HDR_SIZE; 789 790 iphdr = pkt; /* We'll need this later to set proper pkt size */ 791 pkt += IP_HDR_SIZE; 792 793 bp = (Bootp_t *)pkt; 794 bp->bp_op = OP_BOOTREQUEST; 795 bp->bp_htype = HWT_ETHER; 796 bp->bp_hlen = HWL_ETHER; 797 bp->bp_hops = 0; 798 bp->bp_secs = htons(get_timer(0) / CFG_HZ); 799 NetCopyIP(&bp->bp_ciaddr, &bp_offer->bp_ciaddr); /* both in network byte order */ 800 NetCopyIP(&bp->bp_yiaddr, &bp_offer->bp_yiaddr); 801 NetCopyIP(&bp->bp_siaddr, &bp_offer->bp_siaddr); 802 NetCopyIP(&bp->bp_giaddr, &bp_offer->bp_giaddr); 803 memcpy (bp->bp_chaddr, NetOurEther, 6); 804 805 /* 806 * ID is the id of the OFFER packet 807 */ 808 809 NetCopyLong(&bp->bp_id, &bp_offer->bp_id); 810 811 /* 812 * Copy options from OFFER packet if present 813 */ 814 NetCopyIP(&OfferedIP, &bp->bp_yiaddr); 815 extlen = DhcpExtended(bp->bp_vend, DHCP_REQUEST, NetDHCPServerIP, OfferedIP); 816 817 pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + extlen; 818 iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen; 819 NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); 820 821 debug ("Transmitting DHCPREQUEST packet: len = %d\n", pktlen); 822 NetSendPacket(NetTxPacket, pktlen); 823 } 824 825 /* 826 * Handle DHCP received packets. 827 */ 828 static void 829 DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len) 830 { 831 Bootp_t *bp = (Bootp_t *)pkt; 832 833 debug ("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n", 834 src, dest, len, dhcp_state); 835 836 if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */ 837 return; 838 839 debug ("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n", 840 src, dest, len, dhcp_state); 841 842 switch (dhcp_state) { 843 case SELECTING: 844 /* 845 * Wait an appropriate time for any potential DHCPOFFER packets 846 * to arrive. Then select one, and generate DHCPREQUEST response. 847 * If filename is in format we recognize, assume it is a valid 848 * OFFER from a server we want. 849 */ 850 debug ("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file); 851 #ifdef CFG_BOOTFILE_PREFIX 852 if (strncmp(bp->bp_file, 853 CFG_BOOTFILE_PREFIX, 854 strlen(CFG_BOOTFILE_PREFIX)) == 0 ) { 855 #endif /* CFG_BOOTFILE_PREFIX */ 856 857 debug ("TRANSITIONING TO REQUESTING STATE\n"); 858 dhcp_state = REQUESTING; 859 860 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 861 DhcpOptionsProcess(&bp->bp_vend[4]); 862 863 BootpCopyNetParams(bp); /* Store net params from reply */ 864 865 NetSetTimeout(TIMEOUT * CFG_HZ, BootpTimeout); 866 DhcpSendRequestPkt(bp); 867 #ifdef CFG_BOOTFILE_PREFIX 868 } 869 #endif /* CFG_BOOTFILE_PREFIX */ 870 871 return; 872 break; 873 case REQUESTING: 874 debug ("DHCP State: REQUESTING\n"); 875 876 if ( DhcpMessageType(bp->bp_vend) == DHCP_ACK ) { 877 char *s; 878 879 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 880 DhcpOptionsProcess(&bp->bp_vend[4]); 881 BootpCopyNetParams(bp); /* Store net params from reply */ 882 dhcp_state = BOUND; 883 printf("DHCP client bound to address "); 884 print_IPaddr(NetOurIP); 885 printf("\n"); 886 887 /* Obey the 'autoload' setting */ 888 if ((s = getenv("autoload")) != NULL) { 889 if (*s == 'n') { 890 /* 891 * Just use BOOTP to configure system; 892 * Do not use TFTP to load the bootfile. 893 */ 894 NetState = NETLOOP_SUCCESS; 895 return; 896 } else if (strcmp(s, "NFS") == 0) { 897 /* 898 * Use NFS to load the bootfile. 899 */ 900 NfsStart(); 901 return; 902 } 903 } 904 TftpStart(); 905 return; 906 } 907 break; 908 default: 909 printf("DHCP: INVALID STATE\n"); 910 break; 911 } 912 913 } 914 915 void DhcpRequest(void) 916 { 917 BootpRequest(); 918 } 919 #endif /* CFG_CMD_DHCP */ 920 921 #endif /* CFG_CMD_NET */ 922