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((uchar *)&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 char *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_TIMEOFFSET) 452 *e++ = 2; 453 *cnt += 1; 454 #endif 455 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_GATEWAY) 456 *e++ = 3; /* Router Option */ 457 *cnt += 1; 458 #endif 459 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS) 460 *e++ = 6; /* DNS Server(s) */ 461 *cnt += 1; 462 #endif 463 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_HOSTNAME) 464 *e++ = 12; /* Hostname */ 465 *cnt += 1; 466 #endif 467 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTFILESIZE) 468 *e++ = 13; /* Boot File Size */ 469 *cnt += 1; 470 #endif 471 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTPATH) 472 *e++ = 17; /* Boot path */ 473 *cnt += 1; 474 #endif 475 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_NISDOMAIN) 476 *e++ = 40; /* NIS Domain name request */ 477 *cnt += 1; 478 #endif 479 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_NTPSERVER) 480 *e++ = 42; 481 *cnt += 1; 482 #endif 483 *e++ = 255; /* End of the list */ 484 485 /* Pad to minimal length */ 486 #ifdef CONFIG_DHCP_MIN_EXT_LEN 487 while ((e - start) <= CONFIG_DHCP_MIN_EXT_LEN) 488 *e++ = 0; 489 #endif 490 491 return e - start; 492 } 493 494 #else /* CFG_CMD_DHCP */ 495 /* 496 * Warning: no field size check - change CONFIG_BOOTP_MASK at your own risk! 497 */ 498 static int BootpExtended (u8 * e) 499 { 500 u8 *start = e; 501 502 *e++ = 99; /* RFC1048 Magic Cookie */ 503 *e++ = 130; 504 *e++ = 83; 505 *e++ = 99; 506 507 #if (CONFIG_COMMANDS & CFG_CMD_DHCP) 508 *e++ = 53; /* DHCP Message Type */ 509 *e++ = 1; 510 *e++ = DHCP_DISCOVER; 511 512 *e++ = 57; /* Maximum DHCP Message Size */ 513 *e++ = 2; 514 *e++ = (576 - 312 + OPT_SIZE) >> 16; 515 *e++ = (576 - 312 + OPT_SIZE) & 0xff; 516 #endif /* CFG_CMD_DHCP */ 517 518 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SUBNETMASK) 519 *e++ = 1; /* Subnet mask request */ 520 *e++ = 4; 521 e += 4; 522 #endif 523 524 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_GATEWAY) 525 *e++ = 3; /* Default gateway request */ 526 *e++ = 4; 527 e += 4; 528 #endif 529 530 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS) 531 *e++ = 6; /* Domain Name Server */ 532 *e++ = 4; 533 e += 4; 534 #endif 535 536 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_HOSTNAME) 537 *e++ = 12; /* Host name request */ 538 *e++ = 32; 539 e += 32; 540 #endif 541 542 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTFILESIZE) 543 *e++ = 13; /* Boot file size */ 544 *e++ = 2; 545 e += 2; 546 #endif 547 548 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTPATH) 549 *e++ = 17; /* Boot path */ 550 *e++ = 32; 551 e += 32; 552 #endif 553 554 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_NISDOMAIN) 555 *e++ = 40; /* NIS Domain name request */ 556 *e++ = 32; 557 e += 32; 558 #endif 559 560 *e++ = 255; /* End of the list */ 561 562 return e - start; 563 } 564 #endif /* CFG_CMD_DHCP */ 565 566 void 567 BootpRequest (void) 568 { 569 volatile uchar *pkt, *iphdr; 570 Bootp_t *bp; 571 int ext_len, pktlen, iplen; 572 573 #if (CONFIG_COMMANDS & CFG_CMD_DHCP) 574 dhcp_state = INIT; 575 #endif 576 577 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */ 578 unsigned char bi_enetaddr[6]; 579 int reg; 580 char *e,*s; 581 char tmp[64]; 582 ulong tst1, tst2, sum, m_mask, m_value = 0; 583 584 if (BootpTry ==0) { 585 /* get our mac */ 586 reg = getenv_r ("ethaddr", tmp, sizeof(tmp)); 587 s = (reg > 0) ? tmp : NULL; 588 589 for (reg=0; reg<6; ++reg) { 590 bi_enetaddr[reg] = s ? simple_strtoul(s, &e, 16) : 0; 591 if (s) { 592 s = (*e) ? e+1 : e; 593 } 594 } 595 #ifdef DEBUG 596 puts ("BootpRequest => Our Mac: "); 597 for (reg=0; reg<6; reg++) { 598 printf ("%x%c", 599 bi_enetaddr[reg], 600 reg==5 ? '\n' : ':'); 601 } 602 #endif /* DEBUG */ 603 604 /* Mac-Manipulation 2 get seed1 */ 605 tst1=0; 606 tst2=0; 607 for (reg=2; reg<6; reg++) { 608 tst1 = tst1 << 8; 609 tst1 = tst1 | bi_enetaddr[reg]; 610 } 611 for (reg=0; reg<2; reg++) { 612 tst2 = tst2 | bi_enetaddr[reg]; 613 tst2 = tst2 << 8; 614 } 615 616 seed1 = tst1^tst2; 617 618 /* Mirror seed1*/ 619 m_mask=0x1; 620 for (reg=1;reg<=32;reg++) { 621 m_value |= (m_mask & seed1); 622 seed1 = seed1 >> 1; 623 m_value = m_value << 1; 624 } 625 seed1 = m_value; 626 seed2 = 0xB78D0945; 627 } 628 629 /* Random Number Generator */ 630 631 for (reg=0;reg<=0;reg++) { 632 sum = seed1 + seed2; 633 if (sum < seed1 || sum < seed2) 634 sum++; 635 seed2 = seed1; 636 seed1 = sum; 637 638 if (BootpTry<=2) { /* Start with max 1024 * 1ms */ 639 sum = sum >> (22-BootpTry); 640 } else { /*After 3rd BOOTP request max 8192 * 1ms */ 641 sum = sum >> 19; 642 } 643 } 644 645 printf ("Random delay: %ld ms...\n", sum); 646 for (reg=0; reg <sum; reg++) { 647 udelay(1000); /*Wait 1ms*/ 648 } 649 #endif /* CONFIG_BOOTP_RANDOM_DELAY */ 650 651 printf("BOOTP broadcast %d\n", ++BootpTry); 652 pkt = NetTxPacket; 653 memset ((void*)pkt, 0, PKTSIZE); 654 655 pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP); 656 657 /* 658 * Next line results in incorrect packet size being transmitted, resulting 659 * in errors in some DHCP servers, reporting missing bytes. Size must be 660 * set in packet header after extension length has been determined. 661 * C. Hallinan, DS4.COM, Inc. 662 */ 663 /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */ 664 iphdr = pkt; /* We need this later for NetSetIP() */ 665 pkt += IP_HDR_SIZE; 666 667 bp = (Bootp_t *)pkt; 668 bp->bp_op = OP_BOOTREQUEST; 669 bp->bp_htype = HWT_ETHER; 670 bp->bp_hlen = HWL_ETHER; 671 bp->bp_hops = 0; 672 bp->bp_secs = htons(get_timer(0) / CFG_HZ); 673 NetWriteIP(&bp->bp_ciaddr, 0); 674 NetWriteIP(&bp->bp_yiaddr, 0); 675 NetWriteIP(&bp->bp_siaddr, 0); 676 NetWriteIP(&bp->bp_giaddr, 0); 677 memcpy (bp->bp_chaddr, NetOurEther, 6); 678 copy_filename (bp->bp_file, BootFile, sizeof(bp->bp_file)); 679 680 /* Request additional information from the BOOTP/DHCP server */ 681 #if (CONFIG_COMMANDS & CFG_CMD_DHCP) 682 ext_len = DhcpExtended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0); 683 #else 684 ext_len = BootpExtended((u8 *)bp->bp_vend); 685 #endif /* CFG_CMD_DHCP */ 686 687 /* 688 * Bootp ID is the lower 4 bytes of our ethernet address 689 * plus the current time in HZ. 690 */ 691 BootpID = ((ulong)NetOurEther[2] << 24) 692 | ((ulong)NetOurEther[3] << 16) 693 | ((ulong)NetOurEther[4] << 8) 694 | (ulong)NetOurEther[5]; 695 BootpID += get_timer(0); 696 BootpID = htonl(BootpID); 697 NetCopyLong(&bp->bp_id, &BootpID); 698 699 /* 700 * Calculate proper packet lengths taking into account the 701 * variable size of the options field 702 */ 703 pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + ext_len; 704 iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len; 705 NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); 706 NetSetTimeout(SELECT_TIMEOUT * CFG_HZ, BootpTimeout); 707 708 #if (CONFIG_COMMANDS & CFG_CMD_DHCP) 709 dhcp_state = SELECTING; 710 NetSetHandler(DhcpHandler); 711 #else 712 NetSetHandler(BootpHandler); 713 #endif /* CFG_CMD_DHCP */ 714 NetSendPacket(NetTxPacket, pktlen); 715 } 716 717 #if (CONFIG_COMMANDS & CFG_CMD_DHCP) 718 static void DhcpOptionsProcess (uchar * popt, Bootp_t *bp) 719 { 720 uchar *end = popt + BOOTP_HDR_SIZE; 721 int oplen, size; 722 723 while (popt < end && *popt != 0xff) { 724 oplen = *(popt + 1); 725 switch (*popt) { 726 case 1: 727 NetCopyIP (&NetOurSubnetMask, (popt + 2)); 728 break; 729 #if (CONFIG_COMMANDS & CFG_CMD_SNTP) && (CONFIG_BOOTP_MASK & CONFIG_BOOTP_TIMEOFFSET) 730 case 2: /* Time offset */ 731 NetCopyLong (&NetTimeOffset, (ulong *) (popt + 2)); 732 NetTimeOffset = ntohl (NetTimeOffset); 733 break; 734 #endif 735 case 3: 736 NetCopyIP (&NetOurGatewayIP, (popt + 2)); 737 break; 738 case 6: 739 NetCopyIP (&NetOurDNSIP, (popt + 2)); 740 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS2) 741 if (*(popt + 1) > 4) { 742 NetCopyIP (&NetOurDNS2IP, (popt + 2 + 4)); 743 } 744 #endif 745 break; 746 case 12: 747 size = truncate_sz ("Host Name", sizeof (NetOurHostName), oplen); 748 memcpy (&NetOurHostName, popt + 2, size); 749 NetOurHostName[size] = 0; 750 break; 751 case 15: /* Ignore Domain Name Option */ 752 break; 753 case 17: 754 size = truncate_sz ("Root Path", sizeof (NetOurRootPath), oplen); 755 memcpy (&NetOurRootPath, popt + 2, size); 756 NetOurRootPath[size] = 0; 757 break; 758 #if (CONFIG_COMMANDS & CFG_CMD_SNTP) && (CONFIG_BOOTP_MASK & CONFIG_BOOTP_NTPSERVER) 759 case 42: /* NTP server IP */ 760 NetCopyIP (&NetNtpServerIP, (popt + 2)); 761 break; 762 #endif 763 case 51: 764 NetCopyLong (&dhcp_leasetime, (ulong *) (popt + 2)); 765 break; 766 case 53: /* Ignore Message Type Option */ 767 break; 768 case 54: 769 NetCopyIP (&NetDHCPServerIP, (popt + 2)); 770 break; 771 case 58: /* Ignore Renewal Time Option */ 772 break; 773 case 59: /* Ignore Rebinding Time Option */ 774 break; 775 case 66: /* Ignore TFTP server name */ 776 break; 777 case 67: /* vendor opt bootfile */ 778 /* 779 * I can't use dhcp_vendorex_proc here because I need 780 * to write into the bootp packet - even then I had to 781 * pass the bootp packet pointer into here as the 782 * second arg 783 */ 784 size = truncate_sz ("Opt Boot File", 785 sizeof(bp->bp_file), 786 oplen); 787 if (bp->bp_file[0] == '\0' && size > 0) { 788 /* 789 * only use vendor boot file if we didn't 790 * receive a boot file in the main non-vendor 791 * part of the packet - god only knows why 792 * some vendors chose not to use this perfectly 793 * good spot to store the boot file (join on 794 * Tru64 Unix) it seems mind bogglingly crazy 795 * to me 796 */ 797 printf("*** WARNING: using vendor " 798 "optional boot file\n"); 799 memcpy(bp->bp_file, popt + 2, size); 800 bp->bp_file[size] = '\0'; 801 } 802 break; 803 default: 804 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX) 805 if (dhcp_vendorex_proc (popt)) 806 break; 807 #endif 808 printf ("*** Unhandled DHCP Option in OFFER/ACK: %d\n", *popt); 809 break; 810 } 811 popt += oplen + 2; /* Process next option */ 812 } 813 } 814 815 static int DhcpMessageType(unsigned char *popt) 816 { 817 if (NetReadLong((ulong*)popt) != htonl(BOOTP_VENDOR_MAGIC)) 818 return -1; 819 820 popt += 4; 821 while ( *popt != 0xff ) { 822 if ( *popt == 53 ) /* DHCP Message Type */ 823 return *(popt + 2); 824 popt += *(popt + 1) + 2; /* Scan through all options */ 825 } 826 return -1; 827 } 828 829 static void DhcpSendRequestPkt(Bootp_t *bp_offer) 830 { 831 volatile uchar *pkt, *iphdr; 832 Bootp_t *bp; 833 int pktlen, iplen, extlen; 834 IPaddr_t OfferedIP; 835 836 debug ("DhcpSendRequestPkt: Sending DHCPREQUEST\n"); 837 pkt = NetTxPacket; 838 memset ((void*)pkt, 0, PKTSIZE); 839 840 pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP); 841 842 iphdr = pkt; /* We'll need this later to set proper pkt size */ 843 pkt += IP_HDR_SIZE; 844 845 bp = (Bootp_t *)pkt; 846 bp->bp_op = OP_BOOTREQUEST; 847 bp->bp_htype = HWT_ETHER; 848 bp->bp_hlen = HWL_ETHER; 849 bp->bp_hops = 0; 850 bp->bp_secs = htons(get_timer(0) / CFG_HZ); 851 NetCopyIP(&bp->bp_ciaddr, &bp_offer->bp_ciaddr); /* both in network byte order */ 852 NetCopyIP(&bp->bp_yiaddr, &bp_offer->bp_yiaddr); 853 NetCopyIP(&bp->bp_siaddr, &bp_offer->bp_siaddr); 854 /* 855 * RFC3046 requires Relay Agents to discard packets with 856 * nonzero and offered giaddr 857 */ 858 NetWriteIP(&bp->bp_giaddr, 0); 859 860 memcpy (bp->bp_chaddr, NetOurEther, 6); 861 862 /* 863 * ID is the id of the OFFER packet 864 */ 865 866 NetCopyLong(&bp->bp_id, &bp_offer->bp_id); 867 868 /* 869 * Copy options from OFFER packet if present 870 */ 871 NetCopyIP(&OfferedIP, &bp->bp_yiaddr); 872 extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_REQUEST, NetDHCPServerIP, OfferedIP); 873 874 pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + extlen; 875 iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen; 876 NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); 877 878 debug ("Transmitting DHCPREQUEST packet: len = %d\n", pktlen); 879 NetSendPacket(NetTxPacket, pktlen); 880 } 881 882 /* 883 * Handle DHCP received packets. 884 */ 885 static void 886 DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len) 887 { 888 Bootp_t *bp = (Bootp_t *)pkt; 889 890 debug ("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n", 891 src, dest, len, dhcp_state); 892 893 if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */ 894 return; 895 896 debug ("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n", 897 src, dest, len, dhcp_state); 898 899 switch (dhcp_state) { 900 case SELECTING: 901 /* 902 * Wait an appropriate time for any potential DHCPOFFER packets 903 * to arrive. Then select one, and generate DHCPREQUEST response. 904 * If filename is in format we recognize, assume it is a valid 905 * OFFER from a server we want. 906 */ 907 debug ("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file); 908 #ifdef CFG_BOOTFILE_PREFIX 909 if (strncmp(bp->bp_file, 910 CFG_BOOTFILE_PREFIX, 911 strlen(CFG_BOOTFILE_PREFIX)) == 0 ) { 912 #endif /* CFG_BOOTFILE_PREFIX */ 913 914 debug ("TRANSITIONING TO REQUESTING STATE\n"); 915 dhcp_state = REQUESTING; 916 917 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 918 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp); 919 920 BootpCopyNetParams(bp); /* Store net params from reply */ 921 922 NetSetTimeout(TIMEOUT * CFG_HZ, BootpTimeout); 923 DhcpSendRequestPkt(bp); 924 #ifdef CFG_BOOTFILE_PREFIX 925 } 926 #endif /* CFG_BOOTFILE_PREFIX */ 927 928 return; 929 break; 930 case REQUESTING: 931 debug ("DHCP State: REQUESTING\n"); 932 933 if ( DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK ) { 934 char *s; 935 936 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 937 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp); 938 BootpCopyNetParams(bp); /* Store net params from reply */ 939 dhcp_state = BOUND; 940 puts ("DHCP client bound to address "); 941 print_IPaddr(NetOurIP); 942 putc ('\n'); 943 944 /* Obey the 'autoload' setting */ 945 if ((s = getenv("autoload")) != NULL) { 946 if (*s == 'n') { 947 /* 948 * Just use BOOTP to configure system; 949 * Do not use TFTP to load the bootfile. 950 */ 951 NetState = NETLOOP_SUCCESS; 952 return; 953 #if (CONFIG_COMMANDS & CFG_CMD_NFS) 954 } else if (strcmp(s, "NFS") == 0) { 955 /* 956 * Use NFS to load the bootfile. 957 */ 958 NfsStart(); 959 return; 960 #endif 961 } 962 } 963 TftpStart(); 964 return; 965 } 966 break; 967 default: 968 puts ("DHCP: INVALID STATE\n"); 969 break; 970 } 971 972 } 973 974 void DhcpRequest(void) 975 { 976 BootpRequest(); 977 } 978 #endif /* CFG_CMD_DHCP */ 979 980 #endif /* CFG_CMD_NET */ 981