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 #include <common.h> 12 #include <command.h> 13 #include <net.h> 14 #include "bootp.h" 15 #include "tftp.h" 16 #include "nfs.h" 17 #ifdef CONFIG_STATUS_LED 18 #include <status_led.h> 19 #endif 20 21 #define BOOTP_VENDOR_MAGIC 0x63825363 /* RFC1048 Magic Cookie */ 22 23 #define TIMEOUT 5000UL /* Milliseconds before trying BOOTP again */ 24 #ifndef CONFIG_NET_RETRY_COUNT 25 # define TIMEOUT_COUNT 5 /* # of timeouts before giving up */ 26 #else 27 # define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT) 28 #endif 29 30 #define PORT_BOOTPS 67 /* BOOTP server UDP port */ 31 #define PORT_BOOTPC 68 /* BOOTP client UDP port */ 32 33 #ifndef CONFIG_DHCP_MIN_EXT_LEN /* minimal length of extension list */ 34 #define CONFIG_DHCP_MIN_EXT_LEN 64 35 #endif 36 37 ulong BootpID; 38 int BootpTry; 39 #ifdef CONFIG_BOOTP_RANDOM_DELAY 40 ulong seed1, seed2; 41 #endif 42 43 #if defined(CONFIG_CMD_DHCP) 44 dhcp_state_t dhcp_state = INIT; 45 unsigned long dhcp_leasetime = 0; 46 IPaddr_t NetDHCPServerIP = 0; 47 static void DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 48 unsigned len); 49 50 /* For Debug */ 51 #if 0 52 static char *dhcpmsg2str(int type) 53 { 54 switch (type) { 55 case 1: return "DHCPDISCOVER"; break; 56 case 2: return "DHCPOFFER"; break; 57 case 3: return "DHCPREQUEST"; break; 58 case 4: return "DHCPDECLINE"; break; 59 case 5: return "DHCPACK"; break; 60 case 6: return "DHCPNACK"; break; 61 case 7: return "DHCPRELEASE"; break; 62 default: return "UNKNOWN/INVALID MSG TYPE"; break; 63 } 64 } 65 #endif 66 67 #if defined(CONFIG_BOOTP_VENDOREX) 68 extern u8 *dhcp_vendorex_prep (u8 *e); /*rtn new e after add own opts. */ 69 extern u8 *dhcp_vendorex_proc (u8 *e); /*rtn next e if mine,else NULL */ 70 #endif 71 72 #endif 73 74 static int BootpCheckPkt(uchar *pkt, unsigned dest, unsigned src, unsigned len) 75 { 76 Bootp_t *bp = (Bootp_t *) pkt; 77 int retval = 0; 78 79 if (dest != PORT_BOOTPC || src != PORT_BOOTPS) 80 retval = -1; 81 else if (len < sizeof (Bootp_t) - OPT_SIZE) 82 retval = -2; 83 else if (bp->bp_op != OP_BOOTREQUEST && 84 bp->bp_op != OP_BOOTREPLY && 85 bp->bp_op != DHCP_OFFER && 86 bp->bp_op != DHCP_ACK && 87 bp->bp_op != DHCP_NAK ) { 88 retval = -3; 89 } 90 else if (bp->bp_htype != HWT_ETHER) 91 retval = -4; 92 else if (bp->bp_hlen != HWL_ETHER) 93 retval = -5; 94 else if (NetReadLong((ulong*)&bp->bp_id) != BootpID) { 95 retval = -6; 96 } 97 98 debug("Filtering pkt = %d\n", retval); 99 100 return retval; 101 } 102 103 /* 104 * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet 105 */ 106 static void BootpCopyNetParams(Bootp_t *bp) 107 { 108 IPaddr_t tmp_ip; 109 110 NetCopyIP(&NetOurIP, &bp->bp_yiaddr); 111 #if !defined(CONFIG_BOOTP_SERVERIP) 112 NetCopyIP(&tmp_ip, &bp->bp_siaddr); 113 if (tmp_ip != 0) 114 NetCopyIP(&NetServerIP, &bp->bp_siaddr); 115 memcpy (NetServerEther, ((Ethernet_t *)NetRxPacket)->et_src, 6); 116 #endif 117 if (strlen(bp->bp_file) > 0) 118 copy_filename (BootFile, bp->bp_file, sizeof(BootFile)); 119 120 debug("Bootfile: %s\n", BootFile); 121 122 /* Propagate to environment: 123 * don't delete exising entry when BOOTP / DHCP reply does 124 * not contain a new value 125 */ 126 if (*BootFile) { 127 setenv ("bootfile", BootFile); 128 } 129 } 130 131 static int truncate_sz (const char *name, int maxlen, int curlen) 132 { 133 if (curlen >= maxlen) { 134 printf("*** WARNING: %s is too long (%d - max: %d) - truncated\n", 135 name, curlen, maxlen); 136 curlen = maxlen - 1; 137 } 138 return (curlen); 139 } 140 141 #if !defined(CONFIG_CMD_DHCP) 142 143 static void BootpVendorFieldProcess (u8 * ext) 144 { 145 int size = *(ext + 1); 146 147 debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext, 148 *(ext + 1)); 149 150 NetBootFileSize = 0; 151 152 switch (*ext) { 153 /* Fixed length fields */ 154 case 1: /* Subnet mask */ 155 if (NetOurSubnetMask == 0) 156 NetCopyIP (&NetOurSubnetMask, (IPaddr_t *) (ext + 2)); 157 break; 158 case 2: /* Time offset - Not yet supported */ 159 break; 160 /* Variable length fields */ 161 case 3: /* Gateways list */ 162 if (NetOurGatewayIP == 0) { 163 NetCopyIP (&NetOurGatewayIP, (IPaddr_t *) (ext + 2)); 164 } 165 break; 166 case 4: /* Time server - Not yet supported */ 167 break; 168 case 5: /* IEN-116 name server - Not yet supported */ 169 break; 170 case 6: 171 if (NetOurDNSIP == 0) { 172 NetCopyIP (&NetOurDNSIP, (IPaddr_t *) (ext + 2)); 173 } 174 #if defined(CONFIG_BOOTP_DNS2) 175 if ((NetOurDNS2IP == 0) && (size > 4)) { 176 NetCopyIP (&NetOurDNS2IP, (IPaddr_t *) (ext + 2 + 4)); 177 } 178 #endif 179 break; 180 case 7: /* Log server - Not yet supported */ 181 break; 182 case 8: /* Cookie/Quote server - Not yet supported */ 183 break; 184 case 9: /* LPR server - Not yet supported */ 185 break; 186 case 10: /* Impress server - Not yet supported */ 187 break; 188 case 11: /* RPL server - Not yet supported */ 189 break; 190 case 12: /* Host name */ 191 if (NetOurHostName[0] == 0) { 192 size = truncate_sz ("Host Name", sizeof (NetOurHostName), size); 193 memcpy (&NetOurHostName, ext + 2, size); 194 NetOurHostName[size] = 0; 195 } 196 break; 197 case 13: /* Boot file size */ 198 if (size == 2) 199 NetBootFileSize = ntohs (*(ushort *) (ext + 2)); 200 else if (size == 4) 201 NetBootFileSize = ntohl (*(ulong *) (ext + 2)); 202 break; 203 case 14: /* Merit dump file - Not yet supported */ 204 break; 205 case 15: /* Domain name - Not yet supported */ 206 break; 207 case 16: /* Swap server - Not yet supported */ 208 break; 209 case 17: /* Root path */ 210 if (NetOurRootPath[0] == 0) { 211 size = truncate_sz ("Root Path", sizeof (NetOurRootPath), size); 212 memcpy (&NetOurRootPath, ext + 2, size); 213 NetOurRootPath[size] = 0; 214 } 215 break; 216 case 18: /* Extension path - Not yet supported */ 217 /* 218 * This can be used to send the information of the 219 * vendor area in another file that the client can 220 * access via TFTP. 221 */ 222 break; 223 /* IP host layer fields */ 224 case 40: /* NIS Domain name */ 225 if (NetOurNISDomain[0] == 0) { 226 size = truncate_sz ("NIS Domain Name", sizeof (NetOurNISDomain), 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("[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; 253 254 ext += ext[1] + 2; 255 if (ext <= end) 256 BootpVendorFieldProcess (opt); 257 } 258 } 259 260 debug("[BOOTP] Received fields: \n"); 261 if (NetOurSubnetMask) 262 debug("NetOurSubnetMask : %pI4\n", &NetOurSubnetMask); 263 264 if (NetOurGatewayIP) 265 debug("NetOurGatewayIP : %pI4", &NetOurGatewayIP); 266 267 if (NetBootFileSize) 268 debug("NetBootFileSize : %d\n", NetBootFileSize); 269 270 if (NetOurHostName[0]) 271 debug("NetOurHostName : %s\n", NetOurHostName); 272 273 if (NetOurRootPath[0]) 274 debug("NetOurRootPath : %s\n", NetOurRootPath); 275 276 if (NetOurNISDomain[0]) 277 debug("NetOurNISDomain : %s\n", NetOurNISDomain); 278 279 if (NetBootFileSize) 280 debug("NetBootFileSize: %d\n", NetBootFileSize); 281 } 282 /* 283 * Handle a BOOTP received packet. 284 */ 285 static void 286 BootpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 287 unsigned len) 288 { 289 Bootp_t *bp; 290 char *s; 291 292 debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n", 293 src, dest, len, sizeof (Bootp_t)); 294 295 bp = (Bootp_t *)pkt; 296 297 if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */ 298 return; 299 300 /* 301 * Got a good BOOTP reply. Copy the data into our variables. 302 */ 303 #ifdef CONFIG_STATUS_LED 304 status_led_set (STATUS_LED_BOOT, STATUS_LED_OFF); 305 #endif 306 307 BootpCopyNetParams(bp); /* Store net parameters from reply */ 308 309 /* Retrieve extended information (we must parse the vendor area) */ 310 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 311 BootpVendorProcess((uchar *)&bp->bp_vend[4], len); 312 313 NetSetTimeout(0, (thand_f *)0); 314 315 debug("Got good BOOTP\n"); 316 317 if ((s = getenv("autoload")) != NULL) { 318 if (*s == 'n') { 319 /* 320 * Just use BOOTP to configure system; 321 * Do not use TFTP to load the bootfile. 322 */ 323 NetState = NETLOOP_SUCCESS; 324 return; 325 #if defined(CONFIG_CMD_NFS) 326 } else if (strcmp(s, "NFS") == 0) { 327 /* 328 * Use NFS to load the bootfile. 329 */ 330 NfsStart(); 331 return; 332 #endif 333 } 334 } 335 336 TftpStart(); 337 } 338 #endif 339 340 /* 341 * Timeout on BOOTP/DHCP request. 342 */ 343 static void 344 BootpTimeout(void) 345 { 346 if (BootpTry >= TIMEOUT_COUNT) { 347 puts ("\nRetry count exceeded; starting again\n"); 348 NetStartAgain (); 349 } else { 350 NetSetTimeout (TIMEOUT, BootpTimeout); 351 BootpRequest (); 352 } 353 } 354 355 /* 356 * Initialize BOOTP extension fields in the request. 357 */ 358 #if defined(CONFIG_CMD_DHCP) 359 static int DhcpExtended (u8 * e, int message_type, IPaddr_t ServerID, IPaddr_t RequestedIP) 360 { 361 u8 *start = e; 362 u8 *cnt; 363 364 #if defined(CONFIG_BOOTP_VENDOREX) 365 u8 *x; 366 #endif 367 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 368 char *hostname; 369 #endif 370 371 *e++ = 99; /* RFC1048 Magic Cookie */ 372 *e++ = 130; 373 *e++ = 83; 374 *e++ = 99; 375 376 *e++ = 53; /* DHCP Message Type */ 377 *e++ = 1; 378 *e++ = message_type; 379 380 *e++ = 57; /* Maximum DHCP Message Size */ 381 *e++ = 2; 382 *e++ = (576 - 312 + OPT_SIZE) >> 8; 383 *e++ = (576 - 312 + OPT_SIZE) & 0xff; 384 385 if (ServerID) { 386 int tmp = ntohl (ServerID); 387 388 *e++ = 54; /* ServerID */ 389 *e++ = 4; 390 *e++ = tmp >> 24; 391 *e++ = tmp >> 16; 392 *e++ = tmp >> 8; 393 *e++ = tmp & 0xff; 394 } 395 396 if (RequestedIP) { 397 int tmp = ntohl (RequestedIP); 398 399 *e++ = 50; /* Requested IP */ 400 *e++ = 4; 401 *e++ = tmp >> 24; 402 *e++ = tmp >> 16; 403 *e++ = tmp >> 8; 404 *e++ = tmp & 0xff; 405 } 406 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 407 if ((hostname = getenv ("hostname"))) { 408 int hostnamelen = strlen (hostname); 409 410 *e++ = 12; /* Hostname */ 411 *e++ = hostnamelen; 412 memcpy (e, hostname, hostnamelen); 413 e += hostnamelen; 414 } 415 #endif 416 417 #if defined(CONFIG_BOOTP_VENDOREX) 418 if ((x = dhcp_vendorex_prep (e))) 419 return x - start; 420 #endif 421 422 *e++ = 55; /* Parameter Request List */ 423 cnt = e++; /* Pointer to count of requested items */ 424 *cnt = 0; 425 #if defined(CONFIG_BOOTP_SUBNETMASK) 426 *e++ = 1; /* Subnet Mask */ 427 *cnt += 1; 428 #endif 429 #if defined(CONFIG_BOOTP_TIMEOFFSET) 430 *e++ = 2; 431 *cnt += 1; 432 #endif 433 #if defined(CONFIG_BOOTP_GATEWAY) 434 *e++ = 3; /* Router Option */ 435 *cnt += 1; 436 #endif 437 #if defined(CONFIG_BOOTP_DNS) 438 *e++ = 6; /* DNS Server(s) */ 439 *cnt += 1; 440 #endif 441 #if defined(CONFIG_BOOTP_HOSTNAME) 442 *e++ = 12; /* Hostname */ 443 *cnt += 1; 444 #endif 445 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 446 *e++ = 13; /* Boot File Size */ 447 *cnt += 1; 448 #endif 449 #if defined(CONFIG_BOOTP_BOOTPATH) 450 *e++ = 17; /* Boot path */ 451 *cnt += 1; 452 #endif 453 #if defined(CONFIG_BOOTP_NISDOMAIN) 454 *e++ = 40; /* NIS Domain name request */ 455 *cnt += 1; 456 #endif 457 #if defined(CONFIG_BOOTP_NTPSERVER) 458 *e++ = 42; 459 *cnt += 1; 460 #endif 461 /* no options, so back up to avoid sending an empty request list */ 462 if (*cnt == 0) 463 e -= 2; 464 465 *e++ = 255; /* End of the list */ 466 467 /* Pad to minimal length */ 468 #ifdef CONFIG_DHCP_MIN_EXT_LEN 469 while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN) 470 *e++ = 0; 471 #endif 472 473 return e - start; 474 } 475 476 #else 477 /* 478 * Warning: no field size check - change CONFIG_BOOTP_* at your own risk! 479 */ 480 static int BootpExtended (u8 * e) 481 { 482 u8 *start = e; 483 484 *e++ = 99; /* RFC1048 Magic Cookie */ 485 *e++ = 130; 486 *e++ = 83; 487 *e++ = 99; 488 489 #if defined(CONFIG_CMD_DHCP) 490 *e++ = 53; /* DHCP Message Type */ 491 *e++ = 1; 492 *e++ = DHCP_DISCOVER; 493 494 *e++ = 57; /* Maximum DHCP Message Size */ 495 *e++ = 2; 496 *e++ = (576 - 312 + OPT_SIZE) >> 16; 497 *e++ = (576 - 312 + OPT_SIZE) & 0xff; 498 #endif 499 500 #if defined(CONFIG_BOOTP_SUBNETMASK) 501 *e++ = 1; /* Subnet mask request */ 502 *e++ = 4; 503 e += 4; 504 #endif 505 506 #if defined(CONFIG_BOOTP_GATEWAY) 507 *e++ = 3; /* Default gateway request */ 508 *e++ = 4; 509 e += 4; 510 #endif 511 512 #if defined(CONFIG_BOOTP_DNS) 513 *e++ = 6; /* Domain Name Server */ 514 *e++ = 4; 515 e += 4; 516 #endif 517 518 #if defined(CONFIG_BOOTP_HOSTNAME) 519 *e++ = 12; /* Host name request */ 520 *e++ = 32; 521 e += 32; 522 #endif 523 524 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 525 *e++ = 13; /* Boot file size */ 526 *e++ = 2; 527 e += 2; 528 #endif 529 530 #if defined(CONFIG_BOOTP_BOOTPATH) 531 *e++ = 17; /* Boot path */ 532 *e++ = 32; 533 e += 32; 534 #endif 535 536 #if defined(CONFIG_BOOTP_NISDOMAIN) 537 *e++ = 40; /* NIS Domain name request */ 538 *e++ = 32; 539 e += 32; 540 #endif 541 542 *e++ = 255; /* End of the list */ 543 544 return e - start; 545 } 546 #endif 547 548 void 549 BootpRequest (void) 550 { 551 volatile uchar *pkt, *iphdr; 552 Bootp_t *bp; 553 int ext_len, pktlen, iplen; 554 555 #if defined(CONFIG_CMD_DHCP) 556 dhcp_state = INIT; 557 #endif 558 559 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */ 560 unsigned char bi_enetaddr[6]; 561 int reg; 562 ulong tst1, tst2, sum, m_mask, m_value = 0; 563 564 if (BootpTry ==0) { 565 /* get our mac */ 566 eth_getenv_enetaddr("ethaddr", bi_enetaddr); 567 568 debug("BootpRequest => Our Mac: "); 569 for (reg=0; reg<6; reg++) 570 debug("%x%c", bi_enetaddr[reg], reg==5 ? '\n' : ':'); 571 572 /* Mac-Manipulation 2 get seed1 */ 573 tst1=0; 574 tst2=0; 575 for (reg=2; reg<6; reg++) { 576 tst1 = tst1 << 8; 577 tst1 = tst1 | bi_enetaddr[reg]; 578 } 579 for (reg=0; reg<2; reg++) { 580 tst2 = tst2 | bi_enetaddr[reg]; 581 tst2 = tst2 << 8; 582 } 583 584 seed1 = tst1^tst2; 585 586 /* Mirror seed1*/ 587 m_mask=0x1; 588 for (reg=1;reg<=32;reg++) { 589 m_value |= (m_mask & seed1); 590 seed1 = seed1 >> 1; 591 m_value = m_value << 1; 592 } 593 seed1 = m_value; 594 seed2 = 0xB78D0945; 595 } 596 597 /* Random Number Generator */ 598 599 for (reg=0;reg<=0;reg++) { 600 sum = seed1 + seed2; 601 if (sum < seed1 || sum < seed2) 602 sum++; 603 seed2 = seed1; 604 seed1 = sum; 605 606 if (BootpTry<=2) { /* Start with max 1024 * 1ms */ 607 sum = sum >> (22-BootpTry); 608 } else { /*After 3rd BOOTP request max 8192 * 1ms */ 609 sum = sum >> 19; 610 } 611 } 612 613 printf ("Random delay: %ld ms...\n", sum); 614 for (reg=0; reg <sum; reg++) { 615 udelay(1000); /*Wait 1ms*/ 616 } 617 #endif /* CONFIG_BOOTP_RANDOM_DELAY */ 618 619 printf("BOOTP broadcast %d\n", ++BootpTry); 620 pkt = NetTxPacket; 621 memset ((void*)pkt, 0, PKTSIZE); 622 623 pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP); 624 625 /* 626 * Next line results in incorrect packet size being transmitted, resulting 627 * in errors in some DHCP servers, reporting missing bytes. Size must be 628 * set in packet header after extension length has been determined. 629 * C. Hallinan, DS4.COM, Inc. 630 */ 631 /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */ 632 iphdr = pkt; /* We need this later for NetSetIP() */ 633 pkt += IP_HDR_SIZE; 634 635 bp = (Bootp_t *)pkt; 636 bp->bp_op = OP_BOOTREQUEST; 637 bp->bp_htype = HWT_ETHER; 638 bp->bp_hlen = HWL_ETHER; 639 bp->bp_hops = 0; 640 bp->bp_secs = htons(get_timer(0) / 1000); 641 NetWriteIP(&bp->bp_ciaddr, 0); 642 NetWriteIP(&bp->bp_yiaddr, 0); 643 NetWriteIP(&bp->bp_siaddr, 0); 644 NetWriteIP(&bp->bp_giaddr, 0); 645 memcpy (bp->bp_chaddr, NetOurEther, 6); 646 copy_filename (bp->bp_file, BootFile, sizeof(bp->bp_file)); 647 648 /* Request additional information from the BOOTP/DHCP server */ 649 #if defined(CONFIG_CMD_DHCP) 650 ext_len = DhcpExtended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0); 651 #else 652 ext_len = BootpExtended((u8 *)bp->bp_vend); 653 #endif 654 655 /* 656 * Bootp ID is the lower 4 bytes of our ethernet address 657 * plus the current time in ms. 658 */ 659 BootpID = ((ulong)NetOurEther[2] << 24) 660 | ((ulong)NetOurEther[3] << 16) 661 | ((ulong)NetOurEther[4] << 8) 662 | (ulong)NetOurEther[5]; 663 BootpID += get_timer(0); 664 BootpID = htonl(BootpID); 665 NetCopyLong(&bp->bp_id, &BootpID); 666 667 /* 668 * Calculate proper packet lengths taking into account the 669 * variable size of the options field 670 */ 671 pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len; 672 iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len; 673 NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); 674 NetSetTimeout(SELECT_TIMEOUT, BootpTimeout); 675 676 #if defined(CONFIG_CMD_DHCP) 677 dhcp_state = SELECTING; 678 NetSetHandler(DhcpHandler); 679 #else 680 NetSetHandler(BootpHandler); 681 #endif 682 NetSendPacket(NetTxPacket, pktlen); 683 } 684 685 #if defined(CONFIG_CMD_DHCP) 686 static void DhcpOptionsProcess (uchar * popt, Bootp_t *bp) 687 { 688 uchar *end = popt + BOOTP_HDR_SIZE; 689 int oplen, size; 690 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 691 int *to_ptr; 692 #endif 693 694 while (popt < end && *popt != 0xff) { 695 oplen = *(popt + 1); 696 switch (*popt) { 697 case 1: 698 NetCopyIP (&NetOurSubnetMask, (popt + 2)); 699 break; 700 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 701 case 2: /* Time offset */ 702 to_ptr = &NetTimeOffset; 703 NetCopyLong ((ulong *)to_ptr, (ulong *)(popt + 2)); 704 NetTimeOffset = ntohl (NetTimeOffset); 705 break; 706 #endif 707 case 3: 708 NetCopyIP (&NetOurGatewayIP, (popt + 2)); 709 break; 710 case 6: 711 NetCopyIP (&NetOurDNSIP, (popt + 2)); 712 #if defined(CONFIG_BOOTP_DNS2) 713 if (*(popt + 1) > 4) { 714 NetCopyIP (&NetOurDNS2IP, (popt + 2 + 4)); 715 } 716 #endif 717 break; 718 case 12: 719 size = truncate_sz ("Host Name", sizeof (NetOurHostName), oplen); 720 memcpy (&NetOurHostName, popt + 2, size); 721 NetOurHostName[size] = 0; 722 break; 723 case 15: /* Ignore Domain Name Option */ 724 break; 725 case 17: 726 size = truncate_sz ("Root Path", sizeof (NetOurRootPath), oplen); 727 memcpy (&NetOurRootPath, popt + 2, size); 728 NetOurRootPath[size] = 0; 729 break; 730 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 731 case 42: /* NTP server IP */ 732 NetCopyIP (&NetNtpServerIP, (popt + 2)); 733 break; 734 #endif 735 case 51: 736 NetCopyLong (&dhcp_leasetime, (ulong *) (popt + 2)); 737 break; 738 case 53: /* Ignore Message Type Option */ 739 break; 740 case 54: 741 NetCopyIP (&NetDHCPServerIP, (popt + 2)); 742 break; 743 case 58: /* Ignore Renewal Time Option */ 744 break; 745 case 59: /* Ignore Rebinding Time Option */ 746 break; 747 case 66: /* Ignore TFTP server name */ 748 break; 749 case 67: /* vendor opt bootfile */ 750 /* 751 * I can't use dhcp_vendorex_proc here because I need 752 * to write into the bootp packet - even then I had to 753 * pass the bootp packet pointer into here as the 754 * second arg 755 */ 756 size = truncate_sz ("Opt Boot File", 757 sizeof(bp->bp_file), 758 oplen); 759 if (bp->bp_file[0] == '\0' && size > 0) { 760 /* 761 * only use vendor boot file if we didn't 762 * receive a boot file in the main non-vendor 763 * part of the packet - god only knows why 764 * some vendors chose not to use this perfectly 765 * good spot to store the boot file (join on 766 * Tru64 Unix) it seems mind bogglingly crazy 767 * to me 768 */ 769 printf("*** WARNING: using vendor " 770 "optional boot file\n"); 771 memcpy(bp->bp_file, popt + 2, size); 772 bp->bp_file[size] = '\0'; 773 } 774 break; 775 default: 776 #if defined(CONFIG_BOOTP_VENDOREX) 777 if (dhcp_vendorex_proc (popt)) 778 break; 779 #endif 780 printf ("*** Unhandled DHCP Option in OFFER/ACK: %d\n", *popt); 781 break; 782 } 783 popt += oplen + 2; /* Process next option */ 784 } 785 } 786 787 static int DhcpMessageType(unsigned char *popt) 788 { 789 if (NetReadLong((ulong*)popt) != htonl(BOOTP_VENDOR_MAGIC)) 790 return -1; 791 792 popt += 4; 793 while ( *popt != 0xff ) { 794 if ( *popt == 53 ) /* DHCP Message Type */ 795 return *(popt + 2); 796 popt += *(popt + 1) + 2; /* Scan through all options */ 797 } 798 return -1; 799 } 800 801 static void DhcpSendRequestPkt(Bootp_t *bp_offer) 802 { 803 volatile uchar *pkt, *iphdr; 804 Bootp_t *bp; 805 int pktlen, iplen, extlen; 806 IPaddr_t OfferedIP; 807 808 debug("DhcpSendRequestPkt: Sending DHCPREQUEST\n"); 809 pkt = NetTxPacket; 810 memset ((void*)pkt, 0, PKTSIZE); 811 812 pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP); 813 814 iphdr = pkt; /* We'll need this later to set proper pkt size */ 815 pkt += IP_HDR_SIZE; 816 817 bp = (Bootp_t *)pkt; 818 bp->bp_op = OP_BOOTREQUEST; 819 bp->bp_htype = HWT_ETHER; 820 bp->bp_hlen = HWL_ETHER; 821 bp->bp_hops = 0; 822 bp->bp_secs = htons(get_timer(0) / 1000); 823 /* Do not set the client IP, your IP, or server IP yet, since it hasn't been ACK'ed by 824 * the server yet */ 825 826 /* 827 * RFC3046 requires Relay Agents to discard packets with 828 * nonzero and offered giaddr 829 */ 830 NetWriteIP(&bp->bp_giaddr, 0); 831 832 memcpy (bp->bp_chaddr, NetOurEther, 6); 833 834 /* 835 * ID is the id of the OFFER packet 836 */ 837 838 NetCopyLong(&bp->bp_id, &bp_offer->bp_id); 839 840 /* 841 * Copy options from OFFER packet if present 842 */ 843 844 /* Copy offered IP into the parameters request list */ 845 NetCopyIP(&OfferedIP, &bp_offer->bp_yiaddr); 846 extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_REQUEST, NetDHCPServerIP, OfferedIP); 847 848 pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen; 849 iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen; 850 NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); 851 852 debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen); 853 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY 854 udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY); 855 #endif /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */ 856 NetSendPacket(NetTxPacket, pktlen); 857 } 858 859 /* 860 * Handle DHCP received packets. 861 */ 862 static void 863 DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 864 unsigned len) 865 { 866 Bootp_t *bp = (Bootp_t *)pkt; 867 868 debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n", 869 src, dest, len, dhcp_state); 870 871 if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */ 872 return; 873 874 debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n", 875 src, dest, len, dhcp_state); 876 877 switch (dhcp_state) { 878 case SELECTING: 879 /* 880 * Wait an appropriate time for any potential DHCPOFFER packets 881 * to arrive. Then select one, and generate DHCPREQUEST response. 882 * If filename is in format we recognize, assume it is a valid 883 * OFFER from a server we want. 884 */ 885 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file); 886 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 887 if (strncmp(bp->bp_file, 888 CONFIG_SYS_BOOTFILE_PREFIX, 889 strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0 ) { 890 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 891 892 debug("TRANSITIONING TO REQUESTING STATE\n"); 893 dhcp_state = REQUESTING; 894 895 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 896 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp); 897 898 NetSetTimeout(TIMEOUT, BootpTimeout); 899 DhcpSendRequestPkt(bp); 900 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 901 } 902 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 903 904 return; 905 break; 906 case REQUESTING: 907 debug("DHCP State: REQUESTING\n"); 908 909 if ( DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK ) { 910 char *s; 911 912 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 913 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp); 914 BootpCopyNetParams(bp); /* Store net params from reply */ 915 dhcp_state = BOUND; 916 printf ("DHCP client bound to address %pI4\n", &NetOurIP); 917 918 /* Obey the 'autoload' setting */ 919 if ((s = getenv("autoload")) != NULL) { 920 if (*s == 'n') { 921 /* 922 * Just use BOOTP to configure system; 923 * Do not use TFTP to load the bootfile. 924 */ 925 NetState = NETLOOP_SUCCESS; 926 return; 927 #if defined(CONFIG_CMD_NFS) 928 } else if (strcmp(s, "NFS") == 0) { 929 /* 930 * Use NFS to load the bootfile. 931 */ 932 NfsStart(); 933 return; 934 #endif 935 } 936 } 937 TftpStart(); 938 return; 939 } 940 break; 941 case BOUND: 942 /* DHCP client bound to address */ 943 break; 944 default: 945 puts ("DHCP: INVALID STATE\n"); 946 break; 947 } 948 949 } 950 951 void DhcpRequest(void) 952 { 953 BootpRequest(); 954 } 955 #endif /* CONFIG_CMD_DHCP */ 956