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, unsigned src, unsigned len); 48 49 /* For Debug */ 50 #if 0 51 static char *dhcpmsg2str(int type) 52 { 53 switch (type) { 54 case 1: return "DHCPDISCOVER"; break; 55 case 2: return "DHCPOFFER"; break; 56 case 3: return "DHCPREQUEST"; break; 57 case 4: return "DHCPDECLINE"; break; 58 case 5: return "DHCPACK"; break; 59 case 6: return "DHCPNACK"; break; 60 case 7: return "DHCPRELEASE"; break; 61 default: return "UNKNOWN/INVALID MSG TYPE"; break; 62 } 63 } 64 #endif 65 66 #if defined(CONFIG_BOOTP_VENDOREX) 67 extern u8 *dhcp_vendorex_prep (u8 *e); /*rtn new e after add own opts. */ 68 extern u8 *dhcp_vendorex_proc (u8 *e); /*rtn next e if mine,else NULL */ 69 #endif 70 71 #endif 72 73 static int BootpCheckPkt(uchar *pkt, unsigned dest, unsigned src, unsigned len) 74 { 75 Bootp_t *bp = (Bootp_t *) pkt; 76 int retval = 0; 77 78 if (dest != PORT_BOOTPC || src != PORT_BOOTPS) 79 retval = -1; 80 else if (len < sizeof (Bootp_t) - OPT_SIZE) 81 retval = -2; 82 else if (bp->bp_op != OP_BOOTREQUEST && 83 bp->bp_op != OP_BOOTREPLY && 84 bp->bp_op != DHCP_OFFER && 85 bp->bp_op != DHCP_ACK && 86 bp->bp_op != DHCP_NAK ) { 87 retval = -3; 88 } 89 else if (bp->bp_htype != HWT_ETHER) 90 retval = -4; 91 else if (bp->bp_hlen != HWL_ETHER) 92 retval = -5; 93 else if (NetReadLong((ulong*)&bp->bp_id) != BootpID) { 94 retval = -6; 95 } 96 97 debug("Filtering pkt = %d\n", retval); 98 99 return retval; 100 } 101 102 /* 103 * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet 104 */ 105 static void BootpCopyNetParams(Bootp_t *bp) 106 { 107 IPaddr_t tmp_ip; 108 109 NetCopyIP(&NetOurIP, &bp->bp_yiaddr); 110 #if !defined(CONFIG_BOOTP_SERVERIP) 111 NetCopyIP(&tmp_ip, &bp->bp_siaddr); 112 if (tmp_ip != 0) 113 NetCopyIP(&NetServerIP, &bp->bp_siaddr); 114 memcpy (NetServerEther, ((Ethernet_t *)NetRxPacket)->et_src, 6); 115 #endif 116 if (strlen(bp->bp_file) > 0) 117 copy_filename (BootFile, bp->bp_file, sizeof(BootFile)); 118 119 debug("Bootfile: %s\n", BootFile); 120 121 /* Propagate to environment: 122 * don't delete exising entry when BOOTP / DHCP reply does 123 * not contain a new value 124 */ 125 if (*BootFile) { 126 setenv ("bootfile", BootFile); 127 } 128 } 129 130 static int truncate_sz (const char *name, int maxlen, int curlen) 131 { 132 if (curlen >= maxlen) { 133 printf("*** WARNING: %s is too long (%d - max: %d) - truncated\n", 134 name, curlen, maxlen); 135 curlen = maxlen - 1; 136 } 137 return (curlen); 138 } 139 140 #if !defined(CONFIG_CMD_DHCP) 141 142 static void BootpVendorFieldProcess (u8 * ext) 143 { 144 int size = *(ext + 1); 145 146 debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext, 147 *(ext + 1)); 148 149 NetBootFileSize = 0; 150 151 switch (*ext) { 152 /* Fixed length fields */ 153 case 1: /* Subnet mask */ 154 if (NetOurSubnetMask == 0) 155 NetCopyIP (&NetOurSubnetMask, (IPaddr_t *) (ext + 2)); 156 break; 157 case 2: /* Time offset - Not yet supported */ 158 break; 159 /* Variable length fields */ 160 case 3: /* Gateways list */ 161 if (NetOurGatewayIP == 0) { 162 NetCopyIP (&NetOurGatewayIP, (IPaddr_t *) (ext + 2)); 163 } 164 break; 165 case 4: /* Time server - Not yet supported */ 166 break; 167 case 5: /* IEN-116 name server - Not yet supported */ 168 break; 169 case 6: 170 if (NetOurDNSIP == 0) { 171 NetCopyIP (&NetOurDNSIP, (IPaddr_t *) (ext + 2)); 172 } 173 #if defined(CONFIG_BOOTP_DNS2) 174 if ((NetOurDNS2IP == 0) && (size > 4)) { 175 NetCopyIP (&NetOurDNS2IP, (IPaddr_t *) (ext + 2 + 4)); 176 } 177 #endif 178 break; 179 case 7: /* Log server - Not yet supported */ 180 break; 181 case 8: /* Cookie/Quote server - Not yet supported */ 182 break; 183 case 9: /* LPR server - Not yet supported */ 184 break; 185 case 10: /* Impress server - Not yet supported */ 186 break; 187 case 11: /* RPL server - Not yet supported */ 188 break; 189 case 12: /* Host name */ 190 if (NetOurHostName[0] == 0) { 191 size = truncate_sz ("Host Name", sizeof (NetOurHostName), size); 192 memcpy (&NetOurHostName, ext + 2, size); 193 NetOurHostName[size] = 0; 194 } 195 break; 196 case 13: /* Boot file size */ 197 if (size == 2) 198 NetBootFileSize = ntohs (*(ushort *) (ext + 2)); 199 else if (size == 4) 200 NetBootFileSize = ntohl (*(ulong *) (ext + 2)); 201 break; 202 case 14: /* Merit dump file - Not yet supported */ 203 break; 204 case 15: /* Domain name - Not yet supported */ 205 break; 206 case 16: /* Swap server - Not yet supported */ 207 break; 208 case 17: /* Root path */ 209 if (NetOurRootPath[0] == 0) { 210 size = truncate_sz ("Root Path", sizeof (NetOurRootPath), size); 211 memcpy (&NetOurRootPath, ext + 2, size); 212 NetOurRootPath[size] = 0; 213 } 214 break; 215 case 18: /* Extension path - Not yet supported */ 216 /* 217 * This can be used to send the information of the 218 * vendor area in another file that the client can 219 * access via TFTP. 220 */ 221 break; 222 /* IP host layer fields */ 223 case 40: /* NIS Domain name */ 224 if (NetOurNISDomain[0] == 0) { 225 size = truncate_sz ("NIS Domain Name", sizeof (NetOurNISDomain), size); 226 memcpy (&NetOurNISDomain, ext + 2, size); 227 NetOurNISDomain[size] = 0; 228 } 229 break; 230 /* Application layer fields */ 231 case 43: /* Vendor specific info - Not yet supported */ 232 /* 233 * Binary information to exchange specific 234 * product information. 235 */ 236 break; 237 /* Reserved (custom) fields (128..254) */ 238 } 239 } 240 241 static void BootpVendorProcess (u8 * ext, int size) 242 { 243 u8 *end = ext + size; 244 245 debug("[BOOTP] Checking extension (%d bytes)...\n", size); 246 247 while ((ext < end) && (*ext != 0xff)) { 248 if (*ext == 0) { 249 ext++; 250 } else { 251 u8 *opt = ext; 252 253 ext += ext[1] + 2; 254 if (ext <= end) 255 BootpVendorFieldProcess (opt); 256 } 257 } 258 259 debug("[BOOTP] Received fields: \n"); 260 if (NetOurSubnetMask) 261 debug("NetOurSubnetMask : %pI4\n", &NetOurSubnetMask); 262 263 if (NetOurGatewayIP) 264 debug("NetOurGatewayIP : %pI4", &NetOurGatewayIP); 265 266 if (NetBootFileSize) 267 debug("NetBootFileSize : %d\n", NetBootFileSize); 268 269 if (NetOurHostName[0]) 270 debug("NetOurHostName : %s\n", NetOurHostName); 271 272 if (NetOurRootPath[0]) 273 debug("NetOurRootPath : %s\n", NetOurRootPath); 274 275 if (NetOurNISDomain[0]) 276 debug("NetOurNISDomain : %s\n", NetOurNISDomain); 277 278 if (NetBootFileSize) 279 debug("NetBootFileSize: %d\n", NetBootFileSize); 280 } 281 /* 282 * Handle a BOOTP received packet. 283 */ 284 static void 285 BootpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len) 286 { 287 Bootp_t *bp; 288 char *s; 289 290 debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n", 291 src, dest, len, sizeof (Bootp_t)); 292 293 bp = (Bootp_t *)pkt; 294 295 if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */ 296 return; 297 298 /* 299 * Got a good BOOTP reply. Copy the data into our variables. 300 */ 301 #ifdef CONFIG_STATUS_LED 302 status_led_set (STATUS_LED_BOOT, STATUS_LED_OFF); 303 #endif 304 305 BootpCopyNetParams(bp); /* Store net parameters from reply */ 306 307 /* Retrieve extended information (we must parse the vendor area) */ 308 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 309 BootpVendorProcess((uchar *)&bp->bp_vend[4], len); 310 311 NetSetTimeout(0, (thand_f *)0); 312 313 debug("Got good BOOTP\n"); 314 315 if ((s = getenv("autoload")) != NULL) { 316 if (*s == 'n') { 317 /* 318 * Just use BOOTP to configure system; 319 * Do not use TFTP to load the bootfile. 320 */ 321 NetState = NETLOOP_SUCCESS; 322 return; 323 #if defined(CONFIG_CMD_NFS) 324 } else if (strcmp(s, "NFS") == 0) { 325 /* 326 * Use NFS to load the bootfile. 327 */ 328 NfsStart(); 329 return; 330 #endif 331 } 332 } 333 334 TftpStart(); 335 } 336 #endif 337 338 /* 339 * Timeout on BOOTP/DHCP request. 340 */ 341 static void 342 BootpTimeout(void) 343 { 344 if (BootpTry >= TIMEOUT_COUNT) { 345 puts ("\nRetry count exceeded; starting again\n"); 346 NetStartAgain (); 347 } else { 348 NetSetTimeout (TIMEOUT, BootpTimeout); 349 BootpRequest (); 350 } 351 } 352 353 /* 354 * Initialize BOOTP extension fields in the request. 355 */ 356 #if defined(CONFIG_CMD_DHCP) 357 static int DhcpExtended (u8 * e, int message_type, IPaddr_t ServerID, IPaddr_t RequestedIP) 358 { 359 u8 *start = e; 360 u8 *cnt; 361 362 #if defined(CONFIG_BOOTP_VENDOREX) 363 u8 *x; 364 #endif 365 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 366 char *hostname; 367 #endif 368 369 *e++ = 99; /* RFC1048 Magic Cookie */ 370 *e++ = 130; 371 *e++ = 83; 372 *e++ = 99; 373 374 *e++ = 53; /* DHCP Message Type */ 375 *e++ = 1; 376 *e++ = message_type; 377 378 *e++ = 57; /* Maximum DHCP Message Size */ 379 *e++ = 2; 380 *e++ = (576 - 312 + OPT_SIZE) >> 8; 381 *e++ = (576 - 312 + OPT_SIZE) & 0xff; 382 383 if (ServerID) { 384 int tmp = ntohl (ServerID); 385 386 *e++ = 54; /* ServerID */ 387 *e++ = 4; 388 *e++ = tmp >> 24; 389 *e++ = tmp >> 16; 390 *e++ = tmp >> 8; 391 *e++ = tmp & 0xff; 392 } 393 394 if (RequestedIP) { 395 int tmp = ntohl (RequestedIP); 396 397 *e++ = 50; /* Requested IP */ 398 *e++ = 4; 399 *e++ = tmp >> 24; 400 *e++ = tmp >> 16; 401 *e++ = tmp >> 8; 402 *e++ = tmp & 0xff; 403 } 404 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 405 if ((hostname = getenv ("hostname"))) { 406 int hostnamelen = strlen (hostname); 407 408 *e++ = 12; /* Hostname */ 409 *e++ = hostnamelen; 410 memcpy (e, hostname, hostnamelen); 411 e += hostnamelen; 412 } 413 #endif 414 415 #if defined(CONFIG_BOOTP_VENDOREX) 416 if ((x = dhcp_vendorex_prep (e))) 417 return x - start; 418 #endif 419 420 *e++ = 55; /* Parameter Request List */ 421 cnt = e++; /* Pointer to count of requested items */ 422 *cnt = 0; 423 #if defined(CONFIG_BOOTP_SUBNETMASK) 424 *e++ = 1; /* Subnet Mask */ 425 *cnt += 1; 426 #endif 427 #if defined(CONFIG_BOOTP_TIMEOFFSET) 428 *e++ = 2; 429 *cnt += 1; 430 #endif 431 #if defined(CONFIG_BOOTP_GATEWAY) 432 *e++ = 3; /* Router Option */ 433 *cnt += 1; 434 #endif 435 #if defined(CONFIG_BOOTP_DNS) 436 *e++ = 6; /* DNS Server(s) */ 437 *cnt += 1; 438 #endif 439 #if defined(CONFIG_BOOTP_HOSTNAME) 440 *e++ = 12; /* Hostname */ 441 *cnt += 1; 442 #endif 443 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 444 *e++ = 13; /* Boot File Size */ 445 *cnt += 1; 446 #endif 447 #if defined(CONFIG_BOOTP_BOOTPATH) 448 *e++ = 17; /* Boot path */ 449 *cnt += 1; 450 #endif 451 #if defined(CONFIG_BOOTP_NISDOMAIN) 452 *e++ = 40; /* NIS Domain name request */ 453 *cnt += 1; 454 #endif 455 #if defined(CONFIG_BOOTP_NTPSERVER) 456 *e++ = 42; 457 *cnt += 1; 458 #endif 459 /* no options, so back up to avoid sending an empty request list */ 460 if (*cnt == 0) 461 e -= 2; 462 463 *e++ = 255; /* End of the list */ 464 465 /* Pad to minimal length */ 466 #ifdef CONFIG_DHCP_MIN_EXT_LEN 467 while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN) 468 *e++ = 0; 469 #endif 470 471 return e - start; 472 } 473 474 #else 475 /* 476 * Warning: no field size check - change CONFIG_BOOTP_* at your own risk! 477 */ 478 static int BootpExtended (u8 * e) 479 { 480 u8 *start = e; 481 482 *e++ = 99; /* RFC1048 Magic Cookie */ 483 *e++ = 130; 484 *e++ = 83; 485 *e++ = 99; 486 487 #if defined(CONFIG_CMD_DHCP) 488 *e++ = 53; /* DHCP Message Type */ 489 *e++ = 1; 490 *e++ = DHCP_DISCOVER; 491 492 *e++ = 57; /* Maximum DHCP Message Size */ 493 *e++ = 2; 494 *e++ = (576 - 312 + OPT_SIZE) >> 16; 495 *e++ = (576 - 312 + OPT_SIZE) & 0xff; 496 #endif 497 498 #if defined(CONFIG_BOOTP_SUBNETMASK) 499 *e++ = 1; /* Subnet mask request */ 500 *e++ = 4; 501 e += 4; 502 #endif 503 504 #if defined(CONFIG_BOOTP_GATEWAY) 505 *e++ = 3; /* Default gateway request */ 506 *e++ = 4; 507 e += 4; 508 #endif 509 510 #if defined(CONFIG_BOOTP_DNS) 511 *e++ = 6; /* Domain Name Server */ 512 *e++ = 4; 513 e += 4; 514 #endif 515 516 #if defined(CONFIG_BOOTP_HOSTNAME) 517 *e++ = 12; /* Host name request */ 518 *e++ = 32; 519 e += 32; 520 #endif 521 522 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 523 *e++ = 13; /* Boot file size */ 524 *e++ = 2; 525 e += 2; 526 #endif 527 528 #if defined(CONFIG_BOOTP_BOOTPATH) 529 *e++ = 17; /* Boot path */ 530 *e++ = 32; 531 e += 32; 532 #endif 533 534 #if defined(CONFIG_BOOTP_NISDOMAIN) 535 *e++ = 40; /* NIS Domain name request */ 536 *e++ = 32; 537 e += 32; 538 #endif 539 540 *e++ = 255; /* End of the list */ 541 542 return e - start; 543 } 544 #endif 545 546 void 547 BootpRequest (void) 548 { 549 volatile uchar *pkt, *iphdr; 550 Bootp_t *bp; 551 int ext_len, pktlen, iplen; 552 553 #if defined(CONFIG_CMD_DHCP) 554 dhcp_state = INIT; 555 #endif 556 557 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */ 558 unsigned char bi_enetaddr[6]; 559 int reg; 560 ulong tst1, tst2, sum, m_mask, m_value = 0; 561 562 if (BootpTry ==0) { 563 /* get our mac */ 564 eth_getenv_enetaddr("ethaddr", bi_enetaddr); 565 566 debug("BootpRequest => Our Mac: "); 567 for (reg=0; reg<6; reg++) 568 debug("%x%c", bi_enetaddr[reg], reg==5 ? '\n' : ':'); 569 570 /* Mac-Manipulation 2 get seed1 */ 571 tst1=0; 572 tst2=0; 573 for (reg=2; reg<6; reg++) { 574 tst1 = tst1 << 8; 575 tst1 = tst1 | bi_enetaddr[reg]; 576 } 577 for (reg=0; reg<2; reg++) { 578 tst2 = tst2 | bi_enetaddr[reg]; 579 tst2 = tst2 << 8; 580 } 581 582 seed1 = tst1^tst2; 583 584 /* Mirror seed1*/ 585 m_mask=0x1; 586 for (reg=1;reg<=32;reg++) { 587 m_value |= (m_mask & seed1); 588 seed1 = seed1 >> 1; 589 m_value = m_value << 1; 590 } 591 seed1 = m_value; 592 seed2 = 0xB78D0945; 593 } 594 595 /* Random Number Generator */ 596 597 for (reg=0;reg<=0;reg++) { 598 sum = seed1 + seed2; 599 if (sum < seed1 || sum < seed2) 600 sum++; 601 seed2 = seed1; 602 seed1 = sum; 603 604 if (BootpTry<=2) { /* Start with max 1024 * 1ms */ 605 sum = sum >> (22-BootpTry); 606 } else { /*After 3rd BOOTP request max 8192 * 1ms */ 607 sum = sum >> 19; 608 } 609 } 610 611 printf ("Random delay: %ld ms...\n", sum); 612 for (reg=0; reg <sum; reg++) { 613 udelay(1000); /*Wait 1ms*/ 614 } 615 #endif /* CONFIG_BOOTP_RANDOM_DELAY */ 616 617 printf("BOOTP broadcast %d\n", ++BootpTry); 618 pkt = NetTxPacket; 619 memset ((void*)pkt, 0, PKTSIZE); 620 621 pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP); 622 623 /* 624 * Next line results in incorrect packet size being transmitted, resulting 625 * in errors in some DHCP servers, reporting missing bytes. Size must be 626 * set in packet header after extension length has been determined. 627 * C. Hallinan, DS4.COM, Inc. 628 */ 629 /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */ 630 iphdr = pkt; /* We need this later for NetSetIP() */ 631 pkt += IP_HDR_SIZE; 632 633 bp = (Bootp_t *)pkt; 634 bp->bp_op = OP_BOOTREQUEST; 635 bp->bp_htype = HWT_ETHER; 636 bp->bp_hlen = HWL_ETHER; 637 bp->bp_hops = 0; 638 bp->bp_secs = htons(get_timer(0) / 1000); 639 NetWriteIP(&bp->bp_ciaddr, 0); 640 NetWriteIP(&bp->bp_yiaddr, 0); 641 NetWriteIP(&bp->bp_siaddr, 0); 642 NetWriteIP(&bp->bp_giaddr, 0); 643 memcpy (bp->bp_chaddr, NetOurEther, 6); 644 copy_filename (bp->bp_file, BootFile, sizeof(bp->bp_file)); 645 646 /* Request additional information from the BOOTP/DHCP server */ 647 #if defined(CONFIG_CMD_DHCP) 648 ext_len = DhcpExtended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0); 649 #else 650 ext_len = BootpExtended((u8 *)bp->bp_vend); 651 #endif 652 653 /* 654 * Bootp ID is the lower 4 bytes of our ethernet address 655 * plus the current time in ms. 656 */ 657 BootpID = ((ulong)NetOurEther[2] << 24) 658 | ((ulong)NetOurEther[3] << 16) 659 | ((ulong)NetOurEther[4] << 8) 660 | (ulong)NetOurEther[5]; 661 BootpID += get_timer(0); 662 BootpID = htonl(BootpID); 663 NetCopyLong(&bp->bp_id, &BootpID); 664 665 /* 666 * Calculate proper packet lengths taking into account the 667 * variable size of the options field 668 */ 669 pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len; 670 iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len; 671 NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); 672 NetSetTimeout(SELECT_TIMEOUT, BootpTimeout); 673 674 #if defined(CONFIG_CMD_DHCP) 675 dhcp_state = SELECTING; 676 NetSetHandler(DhcpHandler); 677 #else 678 NetSetHandler(BootpHandler); 679 #endif 680 NetSendPacket(NetTxPacket, pktlen); 681 } 682 683 #if defined(CONFIG_CMD_DHCP) 684 static void DhcpOptionsProcess (uchar * popt, Bootp_t *bp) 685 { 686 uchar *end = popt + BOOTP_HDR_SIZE; 687 int oplen, size; 688 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 689 int *to_ptr; 690 #endif 691 692 while (popt < end && *popt != 0xff) { 693 oplen = *(popt + 1); 694 switch (*popt) { 695 case 1: 696 NetCopyIP (&NetOurSubnetMask, (popt + 2)); 697 break; 698 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 699 case 2: /* Time offset */ 700 to_ptr = &NetTimeOffset; 701 NetCopyLong ((ulong *)to_ptr, (ulong *)(popt + 2)); 702 NetTimeOffset = ntohl (NetTimeOffset); 703 break; 704 #endif 705 case 3: 706 NetCopyIP (&NetOurGatewayIP, (popt + 2)); 707 break; 708 case 6: 709 NetCopyIP (&NetOurDNSIP, (popt + 2)); 710 #if defined(CONFIG_BOOTP_DNS2) 711 if (*(popt + 1) > 4) { 712 NetCopyIP (&NetOurDNS2IP, (popt + 2 + 4)); 713 } 714 #endif 715 break; 716 case 12: 717 size = truncate_sz ("Host Name", sizeof (NetOurHostName), oplen); 718 memcpy (&NetOurHostName, popt + 2, size); 719 NetOurHostName[size] = 0; 720 break; 721 case 15: /* Ignore Domain Name Option */ 722 break; 723 case 17: 724 size = truncate_sz ("Root Path", sizeof (NetOurRootPath), oplen); 725 memcpy (&NetOurRootPath, popt + 2, size); 726 NetOurRootPath[size] = 0; 727 break; 728 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 729 case 42: /* NTP server IP */ 730 NetCopyIP (&NetNtpServerIP, (popt + 2)); 731 break; 732 #endif 733 case 51: 734 NetCopyLong (&dhcp_leasetime, (ulong *) (popt + 2)); 735 break; 736 case 53: /* Ignore Message Type Option */ 737 break; 738 case 54: 739 NetCopyIP (&NetDHCPServerIP, (popt + 2)); 740 break; 741 case 58: /* Ignore Renewal Time Option */ 742 break; 743 case 59: /* Ignore Rebinding Time Option */ 744 break; 745 case 66: /* Ignore TFTP server name */ 746 break; 747 case 67: /* vendor opt bootfile */ 748 /* 749 * I can't use dhcp_vendorex_proc here because I need 750 * to write into the bootp packet - even then I had to 751 * pass the bootp packet pointer into here as the 752 * second arg 753 */ 754 size = truncate_sz ("Opt Boot File", 755 sizeof(bp->bp_file), 756 oplen); 757 if (bp->bp_file[0] == '\0' && size > 0) { 758 /* 759 * only use vendor boot file if we didn't 760 * receive a boot file in the main non-vendor 761 * part of the packet - god only knows why 762 * some vendors chose not to use this perfectly 763 * good spot to store the boot file (join on 764 * Tru64 Unix) it seems mind bogglingly crazy 765 * to me 766 */ 767 printf("*** WARNING: using vendor " 768 "optional boot file\n"); 769 memcpy(bp->bp_file, popt + 2, size); 770 bp->bp_file[size] = '\0'; 771 } 772 break; 773 default: 774 #if defined(CONFIG_BOOTP_VENDOREX) 775 if (dhcp_vendorex_proc (popt)) 776 break; 777 #endif 778 printf ("*** Unhandled DHCP Option in OFFER/ACK: %d\n", *popt); 779 break; 780 } 781 popt += oplen + 2; /* Process next option */ 782 } 783 } 784 785 static int DhcpMessageType(unsigned char *popt) 786 { 787 if (NetReadLong((ulong*)popt) != htonl(BOOTP_VENDOR_MAGIC)) 788 return -1; 789 790 popt += 4; 791 while ( *popt != 0xff ) { 792 if ( *popt == 53 ) /* DHCP Message Type */ 793 return *(popt + 2); 794 popt += *(popt + 1) + 2; /* Scan through all options */ 795 } 796 return -1; 797 } 798 799 static void DhcpSendRequestPkt(Bootp_t *bp_offer) 800 { 801 volatile uchar *pkt, *iphdr; 802 Bootp_t *bp; 803 int pktlen, iplen, extlen; 804 IPaddr_t OfferedIP; 805 806 debug("DhcpSendRequestPkt: Sending DHCPREQUEST\n"); 807 pkt = NetTxPacket; 808 memset ((void*)pkt, 0, PKTSIZE); 809 810 pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP); 811 812 iphdr = pkt; /* We'll need this later to set proper pkt size */ 813 pkt += IP_HDR_SIZE; 814 815 bp = (Bootp_t *)pkt; 816 bp->bp_op = OP_BOOTREQUEST; 817 bp->bp_htype = HWT_ETHER; 818 bp->bp_hlen = HWL_ETHER; 819 bp->bp_hops = 0; 820 bp->bp_secs = htons(get_timer(0) / 1000); 821 /* Do not set the client IP, your IP, or server IP yet, since it hasn't been ACK'ed by 822 * the server yet */ 823 824 /* 825 * RFC3046 requires Relay Agents to discard packets with 826 * nonzero and offered giaddr 827 */ 828 NetWriteIP(&bp->bp_giaddr, 0); 829 830 memcpy (bp->bp_chaddr, NetOurEther, 6); 831 832 /* 833 * ID is the id of the OFFER packet 834 */ 835 836 NetCopyLong(&bp->bp_id, &bp_offer->bp_id); 837 838 /* 839 * Copy options from OFFER packet if present 840 */ 841 842 /* Copy offered IP into the parameters request list */ 843 NetCopyIP(&OfferedIP, &bp_offer->bp_yiaddr); 844 extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_REQUEST, NetDHCPServerIP, OfferedIP); 845 846 pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen; 847 iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen; 848 NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); 849 850 debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen); 851 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY 852 udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY); 853 #endif /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */ 854 NetSendPacket(NetTxPacket, pktlen); 855 } 856 857 /* 858 * Handle DHCP received packets. 859 */ 860 static void 861 DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len) 862 { 863 Bootp_t *bp = (Bootp_t *)pkt; 864 865 debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n", 866 src, dest, len, dhcp_state); 867 868 if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */ 869 return; 870 871 debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n", 872 src, dest, len, dhcp_state); 873 874 switch (dhcp_state) { 875 case SELECTING: 876 /* 877 * Wait an appropriate time for any potential DHCPOFFER packets 878 * to arrive. Then select one, and generate DHCPREQUEST response. 879 * If filename is in format we recognize, assume it is a valid 880 * OFFER from a server we want. 881 */ 882 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file); 883 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 884 if (strncmp(bp->bp_file, 885 CONFIG_SYS_BOOTFILE_PREFIX, 886 strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0 ) { 887 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 888 889 debug("TRANSITIONING TO REQUESTING STATE\n"); 890 dhcp_state = REQUESTING; 891 892 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 893 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp); 894 895 NetSetTimeout(TIMEOUT, BootpTimeout); 896 DhcpSendRequestPkt(bp); 897 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 898 } 899 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 900 901 return; 902 break; 903 case REQUESTING: 904 debug("DHCP State: REQUESTING\n"); 905 906 if ( DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK ) { 907 char *s; 908 909 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 910 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp); 911 BootpCopyNetParams(bp); /* Store net params from reply */ 912 dhcp_state = BOUND; 913 printf ("DHCP client bound to address %pI4\n", &NetOurIP); 914 915 /* Obey the 'autoload' setting */ 916 if ((s = getenv("autoload")) != NULL) { 917 if (*s == 'n') { 918 /* 919 * Just use BOOTP to configure system; 920 * Do not use TFTP to load the bootfile. 921 */ 922 NetState = NETLOOP_SUCCESS; 923 return; 924 #if defined(CONFIG_CMD_NFS) 925 } else if (strcmp(s, "NFS") == 0) { 926 /* 927 * Use NFS to load the bootfile. 928 */ 929 NfsStart(); 930 return; 931 #endif 932 } 933 } 934 TftpStart(); 935 return; 936 } 937 break; 938 case BOUND: 939 /* DHCP client bound to address */ 940 break; 941 default: 942 puts ("DHCP: INVALID STATE\n"); 943 break; 944 } 945 946 } 947 948 void DhcpRequest(void) 949 { 950 BootpRequest(); 951 } 952 #endif /* CONFIG_CMD_DHCP */ 953