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 defined(CONFIG_CMD_NET) 35 36 #define TIMEOUT 5000UL /* Milliseconds 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 defined(CONFIG_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 defined(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 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 #if !defined(CONFIG_BOOTP_SERVERIP) 124 NetCopyIP(&tmp_ip, &bp->bp_siaddr); 125 if (tmp_ip != 0) 126 NetCopyIP(&NetServerIP, &bp->bp_siaddr); 127 memcpy (NetServerEther, ((Ethernet_t *)NetRxPkt)->et_src, 6); 128 #endif 129 if (strlen(bp->bp_file) > 0) 130 copy_filename (BootFile, bp->bp_file, sizeof(BootFile)); 131 132 debug ("Bootfile: %s\n", BootFile); 133 134 /* Propagate to environment: 135 * don't delete exising entry when BOOTP / DHCP reply does 136 * not contain a new value 137 */ 138 if (*BootFile) { 139 setenv ("bootfile", BootFile); 140 } 141 } 142 143 static int truncate_sz (const char *name, int maxlen, int curlen) 144 { 145 if (curlen >= maxlen) { 146 printf("*** WARNING: %s is too long (%d - max: %d) - truncated\n", 147 name, curlen, maxlen); 148 curlen = maxlen - 1; 149 } 150 return (curlen); 151 } 152 153 #if !defined(CONFIG_CMD_DHCP) 154 155 static void BootpVendorFieldProcess (u8 * ext) 156 { 157 int size = *(ext + 1); 158 159 debug_ext ("[BOOTP] Processing extension %d... (%d bytes)\n", *ext, 160 *(ext + 1)); 161 162 NetBootFileSize = 0; 163 164 switch (*ext) { 165 /* Fixed length fields */ 166 case 1: /* Subnet mask */ 167 if (NetOurSubnetMask == 0) 168 NetCopyIP (&NetOurSubnetMask, (IPaddr_t *) (ext + 2)); 169 break; 170 case 2: /* Time offset - Not yet supported */ 171 break; 172 /* Variable length fields */ 173 case 3: /* Gateways list */ 174 if (NetOurGatewayIP == 0) { 175 NetCopyIP (&NetOurGatewayIP, (IPaddr_t *) (ext + 2)); 176 } 177 break; 178 case 4: /* Time server - Not yet supported */ 179 break; 180 case 5: /* IEN-116 name server - Not yet supported */ 181 break; 182 case 6: 183 if (NetOurDNSIP == 0) { 184 NetCopyIP (&NetOurDNSIP, (IPaddr_t *) (ext + 2)); 185 } 186 #if defined(CONFIG_BOOTP_DNS2) 187 if ((NetOurDNS2IP == 0) && (size > 4)) { 188 NetCopyIP (&NetOurDNS2IP, (IPaddr_t *) (ext + 2 + 4)); 189 } 190 #endif 191 break; 192 case 7: /* Log server - Not yet supported */ 193 break; 194 case 8: /* Cookie/Quote server - Not yet supported */ 195 break; 196 case 9: /* LPR server - Not yet supported */ 197 break; 198 case 10: /* Impress server - Not yet supported */ 199 break; 200 case 11: /* RPL server - Not yet supported */ 201 break; 202 case 12: /* Host name */ 203 if (NetOurHostName[0] == 0) { 204 size = truncate_sz ("Host Name", sizeof (NetOurHostName), size); 205 memcpy (&NetOurHostName, ext + 2, size); 206 NetOurHostName[size] = 0; 207 } 208 break; 209 case 13: /* Boot file size */ 210 if (size == 2) 211 NetBootFileSize = ntohs (*(ushort *) (ext + 2)); 212 else if (size == 4) 213 NetBootFileSize = ntohl (*(ulong *) (ext + 2)); 214 break; 215 case 14: /* Merit dump file - Not yet supported */ 216 break; 217 case 15: /* Domain name - Not yet supported */ 218 break; 219 case 16: /* Swap server - Not yet supported */ 220 break; 221 case 17: /* Root path */ 222 if (NetOurRootPath[0] == 0) { 223 size = truncate_sz ("Root Path", sizeof (NetOurRootPath), size); 224 memcpy (&NetOurRootPath, ext + 2, size); 225 NetOurRootPath[size] = 0; 226 } 227 break; 228 case 18: /* Extension path - Not yet supported */ 229 /* 230 * This can be used to send the information of the 231 * vendor area in another file that the client can 232 * access via TFTP. 233 */ 234 break; 235 /* IP host layer fields */ 236 case 40: /* NIS Domain name */ 237 if (NetOurNISDomain[0] == 0) { 238 size = truncate_sz ("NIS Domain Name", sizeof (NetOurNISDomain), size); 239 memcpy (&NetOurNISDomain, ext + 2, size); 240 NetOurNISDomain[size] = 0; 241 } 242 break; 243 /* Application layer fields */ 244 case 43: /* Vendor specific info - Not yet supported */ 245 /* 246 * Binary information to exchange specific 247 * product information. 248 */ 249 break; 250 /* Reserved (custom) fields (128..254) */ 251 } 252 } 253 254 static void BootpVendorProcess (u8 * ext, int size) 255 { 256 u8 *end = ext + size; 257 258 debug_ext ("[BOOTP] Checking extension (%d bytes)...\n", size); 259 260 while ((ext < end) && (*ext != 0xff)) { 261 if (*ext == 0) { 262 ext++; 263 } else { 264 u8 *opt = ext; 265 266 ext += ext[1] + 2; 267 if (ext <= end) 268 BootpVendorFieldProcess (opt); 269 } 270 } 271 272 #ifdef DEBUG_BOOTP_EXT 273 puts ("[BOOTP] Received fields: \n"); 274 if (NetOurSubnetMask) 275 printf ("NetOurSubnetMask : %pI4\n", &NetOurSubnetMask); 276 277 if (NetOurGatewayIP) 278 printf ("NetOurGatewayIP : %pI4", &NetOurGatewayIP); 279 280 if (NetBootFileSize) { 281 printf ("NetBootFileSize : %d\n", NetBootFileSize); 282 } 283 284 if (NetOurHostName[0]) { 285 printf ("NetOurHostName : %s\n", NetOurHostName); 286 } 287 288 if (NetOurRootPath[0]) { 289 printf ("NetOurRootPath : %s\n", NetOurRootPath); 290 } 291 292 if (NetOurNISDomain[0]) { 293 printf ("NetOurNISDomain : %s\n", NetOurNISDomain); 294 } 295 296 if (NetBootFileSize) { 297 printf ("NetBootFileSize: %d\n", NetBootFileSize); 298 } 299 #endif /* DEBUG_BOOTP_EXT */ 300 } 301 /* 302 * Handle a BOOTP received packet. 303 */ 304 static void 305 BootpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len) 306 { 307 Bootp_t *bp; 308 char *s; 309 310 debug ("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n", 311 src, dest, len, sizeof (Bootp_t)); 312 313 bp = (Bootp_t *)pkt; 314 315 if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */ 316 return; 317 318 /* 319 * Got a good BOOTP reply. Copy the data into our variables. 320 */ 321 #ifdef CONFIG_STATUS_LED 322 status_led_set (STATUS_LED_BOOT, STATUS_LED_OFF); 323 #endif 324 325 BootpCopyNetParams(bp); /* Store net parameters from reply */ 326 327 /* Retrieve extended information (we must parse the vendor area) */ 328 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 329 BootpVendorProcess((uchar *)&bp->bp_vend[4], len); 330 331 NetSetTimeout(0, (thand_f *)0); 332 333 debug ("Got good BOOTP\n"); 334 335 if ((s = getenv("autoload")) != NULL) { 336 if (*s == 'n') { 337 /* 338 * Just use BOOTP to configure system; 339 * Do not use TFTP to load the bootfile. 340 */ 341 NetState = NETLOOP_SUCCESS; 342 return; 343 #if defined(CONFIG_CMD_NFS) 344 } else if (strcmp(s, "NFS") == 0) { 345 /* 346 * Use NFS to load the bootfile. 347 */ 348 NfsStart(); 349 return; 350 #endif 351 } 352 } 353 354 TftpStart(); 355 } 356 #endif 357 358 /* 359 * Timeout on BOOTP/DHCP request. 360 */ 361 static void 362 BootpTimeout(void) 363 { 364 if (BootpTry >= TIMEOUT_COUNT) { 365 puts ("\nRetry count exceeded; starting again\n"); 366 NetStartAgain (); 367 } else { 368 NetSetTimeout (TIMEOUT, BootpTimeout); 369 BootpRequest (); 370 } 371 } 372 373 /* 374 * Initialize BOOTP extension fields in the request. 375 */ 376 #if defined(CONFIG_CMD_DHCP) 377 static int DhcpExtended (u8 * e, int message_type, IPaddr_t ServerID, IPaddr_t RequestedIP) 378 { 379 u8 *start = e; 380 u8 *cnt; 381 382 #if defined(CONFIG_BOOTP_VENDOREX) 383 u8 *x; 384 #endif 385 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 386 char *hostname; 387 #endif 388 389 *e++ = 99; /* RFC1048 Magic Cookie */ 390 *e++ = 130; 391 *e++ = 83; 392 *e++ = 99; 393 394 *e++ = 53; /* DHCP Message Type */ 395 *e++ = 1; 396 *e++ = message_type; 397 398 *e++ = 57; /* Maximum DHCP Message Size */ 399 *e++ = 2; 400 *e++ = (576 - 312 + OPT_SIZE) >> 8; 401 *e++ = (576 - 312 + OPT_SIZE) & 0xff; 402 403 if (ServerID) { 404 int tmp = ntohl (ServerID); 405 406 *e++ = 54; /* ServerID */ 407 *e++ = 4; 408 *e++ = tmp >> 24; 409 *e++ = tmp >> 16; 410 *e++ = tmp >> 8; 411 *e++ = tmp & 0xff; 412 } 413 414 if (RequestedIP) { 415 int tmp = ntohl (RequestedIP); 416 417 *e++ = 50; /* Requested IP */ 418 *e++ = 4; 419 *e++ = tmp >> 24; 420 *e++ = tmp >> 16; 421 *e++ = tmp >> 8; 422 *e++ = tmp & 0xff; 423 } 424 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 425 if ((hostname = getenv ("hostname"))) { 426 int hostnamelen = strlen (hostname); 427 428 *e++ = 12; /* Hostname */ 429 *e++ = hostnamelen; 430 memcpy (e, hostname, hostnamelen); 431 e += hostnamelen; 432 } 433 #endif 434 435 #if defined(CONFIG_BOOTP_VENDOREX) 436 if ((x = dhcp_vendorex_prep (e))) 437 return x - start; 438 #endif 439 440 *e++ = 55; /* Parameter Request List */ 441 cnt = e++; /* Pointer to count of requested items */ 442 *cnt = 0; 443 #if defined(CONFIG_BOOTP_SUBNETMASK) 444 *e++ = 1; /* Subnet Mask */ 445 *cnt += 1; 446 #endif 447 #if defined(CONFIG_BOOTP_TIMEOFFSET) 448 *e++ = 2; 449 *cnt += 1; 450 #endif 451 #if defined(CONFIG_BOOTP_GATEWAY) 452 *e++ = 3; /* Router Option */ 453 *cnt += 1; 454 #endif 455 #if defined(CONFIG_BOOTP_DNS) 456 *e++ = 6; /* DNS Server(s) */ 457 *cnt += 1; 458 #endif 459 #if defined(CONFIG_BOOTP_HOSTNAME) 460 *e++ = 12; /* Hostname */ 461 *cnt += 1; 462 #endif 463 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 464 *e++ = 13; /* Boot File Size */ 465 *cnt += 1; 466 #endif 467 #if defined(CONFIG_BOOTP_BOOTPATH) 468 *e++ = 17; /* Boot path */ 469 *cnt += 1; 470 #endif 471 #if defined(CONFIG_BOOTP_NISDOMAIN) 472 *e++ = 40; /* NIS Domain name request */ 473 *cnt += 1; 474 #endif 475 #if defined(CONFIG_BOOTP_NTPSERVER) 476 *e++ = 42; 477 *cnt += 1; 478 #endif 479 *e++ = 255; /* End of the list */ 480 481 /* Pad to minimal length */ 482 #ifdef CONFIG_DHCP_MIN_EXT_LEN 483 while ((e - start) <= CONFIG_DHCP_MIN_EXT_LEN) 484 *e++ = 0; 485 #endif 486 487 return e - start; 488 } 489 490 #else 491 /* 492 * Warning: no field size check - change CONFIG_BOOTP_* at your own risk! 493 */ 494 static int BootpExtended (u8 * e) 495 { 496 u8 *start = e; 497 498 *e++ = 99; /* RFC1048 Magic Cookie */ 499 *e++ = 130; 500 *e++ = 83; 501 *e++ = 99; 502 503 #if defined(CONFIG_CMD_DHCP) 504 *e++ = 53; /* DHCP Message Type */ 505 *e++ = 1; 506 *e++ = DHCP_DISCOVER; 507 508 *e++ = 57; /* Maximum DHCP Message Size */ 509 *e++ = 2; 510 *e++ = (576 - 312 + OPT_SIZE) >> 16; 511 *e++ = (576 - 312 + OPT_SIZE) & 0xff; 512 #endif 513 514 #if defined(CONFIG_BOOTP_SUBNETMASK) 515 *e++ = 1; /* Subnet mask request */ 516 *e++ = 4; 517 e += 4; 518 #endif 519 520 #if defined(CONFIG_BOOTP_GATEWAY) 521 *e++ = 3; /* Default gateway request */ 522 *e++ = 4; 523 e += 4; 524 #endif 525 526 #if defined(CONFIG_BOOTP_DNS) 527 *e++ = 6; /* Domain Name Server */ 528 *e++ = 4; 529 e += 4; 530 #endif 531 532 #if defined(CONFIG_BOOTP_HOSTNAME) 533 *e++ = 12; /* Host name request */ 534 *e++ = 32; 535 e += 32; 536 #endif 537 538 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 539 *e++ = 13; /* Boot file size */ 540 *e++ = 2; 541 e += 2; 542 #endif 543 544 #if defined(CONFIG_BOOTP_BOOTPATH) 545 *e++ = 17; /* Boot path */ 546 *e++ = 32; 547 e += 32; 548 #endif 549 550 #if defined(CONFIG_BOOTP_NISDOMAIN) 551 *e++ = 40; /* NIS Domain name request */ 552 *e++ = 32; 553 e += 32; 554 #endif 555 556 *e++ = 255; /* End of the list */ 557 558 return e - start; 559 } 560 #endif 561 562 void 563 BootpRequest (void) 564 { 565 volatile uchar *pkt, *iphdr; 566 Bootp_t *bp; 567 int ext_len, pktlen, iplen; 568 569 #if defined(CONFIG_CMD_DHCP) 570 dhcp_state = INIT; 571 #endif 572 573 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */ 574 unsigned char bi_enetaddr[6]; 575 int reg; 576 char *e,*s; 577 char tmp[64]; 578 ulong tst1, tst2, sum, m_mask, m_value = 0; 579 580 if (BootpTry ==0) { 581 /* get our mac */ 582 reg = getenv_r ("ethaddr", tmp, sizeof(tmp)); 583 s = (reg > 0) ? tmp : NULL; 584 585 for (reg=0; reg<6; ++reg) { 586 bi_enetaddr[reg] = s ? simple_strtoul(s, &e, 16) : 0; 587 if (s) { 588 s = (*e) ? e+1 : e; 589 } 590 } 591 #ifdef DEBUG 592 puts ("BootpRequest => Our Mac: "); 593 for (reg=0; reg<6; reg++) { 594 printf ("%x%c", 595 bi_enetaddr[reg], 596 reg==5 ? '\n' : ':'); 597 } 598 #endif /* DEBUG */ 599 600 /* Mac-Manipulation 2 get seed1 */ 601 tst1=0; 602 tst2=0; 603 for (reg=2; reg<6; reg++) { 604 tst1 = tst1 << 8; 605 tst1 = tst1 | bi_enetaddr[reg]; 606 } 607 for (reg=0; reg<2; reg++) { 608 tst2 = tst2 | bi_enetaddr[reg]; 609 tst2 = tst2 << 8; 610 } 611 612 seed1 = tst1^tst2; 613 614 /* Mirror seed1*/ 615 m_mask=0x1; 616 for (reg=1;reg<=32;reg++) { 617 m_value |= (m_mask & seed1); 618 seed1 = seed1 >> 1; 619 m_value = m_value << 1; 620 } 621 seed1 = m_value; 622 seed2 = 0xB78D0945; 623 } 624 625 /* Random Number Generator */ 626 627 for (reg=0;reg<=0;reg++) { 628 sum = seed1 + seed2; 629 if (sum < seed1 || sum < seed2) 630 sum++; 631 seed2 = seed1; 632 seed1 = sum; 633 634 if (BootpTry<=2) { /* Start with max 1024 * 1ms */ 635 sum = sum >> (22-BootpTry); 636 } else { /*After 3rd BOOTP request max 8192 * 1ms */ 637 sum = sum >> 19; 638 } 639 } 640 641 printf ("Random delay: %ld ms...\n", sum); 642 for (reg=0; reg <sum; reg++) { 643 udelay(1000); /*Wait 1ms*/ 644 } 645 #endif /* CONFIG_BOOTP_RANDOM_DELAY */ 646 647 printf("BOOTP broadcast %d\n", ++BootpTry); 648 pkt = NetTxPacket; 649 memset ((void*)pkt, 0, PKTSIZE); 650 651 pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP); 652 653 /* 654 * Next line results in incorrect packet size being transmitted, resulting 655 * in errors in some DHCP servers, reporting missing bytes. Size must be 656 * set in packet header after extension length has been determined. 657 * C. Hallinan, DS4.COM, Inc. 658 */ 659 /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */ 660 iphdr = pkt; /* We need this later for NetSetIP() */ 661 pkt += IP_HDR_SIZE; 662 663 bp = (Bootp_t *)pkt; 664 bp->bp_op = OP_BOOTREQUEST; 665 bp->bp_htype = HWT_ETHER; 666 bp->bp_hlen = HWL_ETHER; 667 bp->bp_hops = 0; 668 bp->bp_secs = htons(get_timer(0) / 1000); 669 NetWriteIP(&bp->bp_ciaddr, 0); 670 NetWriteIP(&bp->bp_yiaddr, 0); 671 NetWriteIP(&bp->bp_siaddr, 0); 672 NetWriteIP(&bp->bp_giaddr, 0); 673 memcpy (bp->bp_chaddr, NetOurEther, 6); 674 copy_filename (bp->bp_file, BootFile, sizeof(bp->bp_file)); 675 676 /* Request additional information from the BOOTP/DHCP server */ 677 #if defined(CONFIG_CMD_DHCP) 678 ext_len = DhcpExtended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0); 679 #else 680 ext_len = BootpExtended((u8 *)bp->bp_vend); 681 #endif 682 683 /* 684 * Bootp ID is the lower 4 bytes of our ethernet address 685 * plus the current time in ms. 686 */ 687 BootpID = ((ulong)NetOurEther[2] << 24) 688 | ((ulong)NetOurEther[3] << 16) 689 | ((ulong)NetOurEther[4] << 8) 690 | (ulong)NetOurEther[5]; 691 BootpID += get_timer(0); 692 BootpID = htonl(BootpID); 693 NetCopyLong(&bp->bp_id, &BootpID); 694 695 /* 696 * Calculate proper packet lengths taking into account the 697 * variable size of the options field 698 */ 699 pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + ext_len; 700 iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len; 701 NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); 702 NetSetTimeout(SELECT_TIMEOUT, BootpTimeout); 703 704 #if defined(CONFIG_CMD_DHCP) 705 dhcp_state = SELECTING; 706 NetSetHandler(DhcpHandler); 707 #else 708 NetSetHandler(BootpHandler); 709 #endif 710 NetSendPacket(NetTxPacket, pktlen); 711 } 712 713 #if defined(CONFIG_CMD_DHCP) 714 static void DhcpOptionsProcess (uchar * popt, Bootp_t *bp) 715 { 716 uchar *end = popt + BOOTP_HDR_SIZE; 717 int oplen, size; 718 719 while (popt < end && *popt != 0xff) { 720 oplen = *(popt + 1); 721 switch (*popt) { 722 case 1: 723 NetCopyIP (&NetOurSubnetMask, (popt + 2)); 724 break; 725 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 726 case 2: /* Time offset */ 727 NetCopyLong ((ulong *)&NetTimeOffset, (ulong *) (popt + 2)); 728 NetTimeOffset = ntohl (NetTimeOffset); 729 break; 730 #endif 731 case 3: 732 NetCopyIP (&NetOurGatewayIP, (popt + 2)); 733 break; 734 case 6: 735 NetCopyIP (&NetOurDNSIP, (popt + 2)); 736 #if defined(CONFIG_BOOTP_DNS2) 737 if (*(popt + 1) > 4) { 738 NetCopyIP (&NetOurDNS2IP, (popt + 2 + 4)); 739 } 740 #endif 741 break; 742 case 12: 743 size = truncate_sz ("Host Name", sizeof (NetOurHostName), oplen); 744 memcpy (&NetOurHostName, popt + 2, size); 745 NetOurHostName[size] = 0; 746 break; 747 case 15: /* Ignore Domain Name Option */ 748 break; 749 case 17: 750 size = truncate_sz ("Root Path", sizeof (NetOurRootPath), oplen); 751 memcpy (&NetOurRootPath, popt + 2, size); 752 NetOurRootPath[size] = 0; 753 break; 754 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 755 case 42: /* NTP server IP */ 756 NetCopyIP (&NetNtpServerIP, (popt + 2)); 757 break; 758 #endif 759 case 51: 760 NetCopyLong (&dhcp_leasetime, (ulong *) (popt + 2)); 761 break; 762 case 53: /* Ignore Message Type Option */ 763 break; 764 case 54: 765 NetCopyIP (&NetDHCPServerIP, (popt + 2)); 766 break; 767 case 58: /* Ignore Renewal Time Option */ 768 break; 769 case 59: /* Ignore Rebinding Time Option */ 770 break; 771 case 66: /* Ignore TFTP server name */ 772 break; 773 case 67: /* vendor opt bootfile */ 774 /* 775 * I can't use dhcp_vendorex_proc here because I need 776 * to write into the bootp packet - even then I had to 777 * pass the bootp packet pointer into here as the 778 * second arg 779 */ 780 size = truncate_sz ("Opt Boot File", 781 sizeof(bp->bp_file), 782 oplen); 783 if (bp->bp_file[0] == '\0' && size > 0) { 784 /* 785 * only use vendor boot file if we didn't 786 * receive a boot file in the main non-vendor 787 * part of the packet - god only knows why 788 * some vendors chose not to use this perfectly 789 * good spot to store the boot file (join on 790 * Tru64 Unix) it seems mind bogglingly crazy 791 * to me 792 */ 793 printf("*** WARNING: using vendor " 794 "optional boot file\n"); 795 memcpy(bp->bp_file, popt + 2, size); 796 bp->bp_file[size] = '\0'; 797 } 798 break; 799 default: 800 #if defined(CONFIG_BOOTP_VENDOREX) 801 if (dhcp_vendorex_proc (popt)) 802 break; 803 #endif 804 printf ("*** Unhandled DHCP Option in OFFER/ACK: %d\n", *popt); 805 break; 806 } 807 popt += oplen + 2; /* Process next option */ 808 } 809 } 810 811 static int DhcpMessageType(unsigned char *popt) 812 { 813 if (NetReadLong((ulong*)popt) != htonl(BOOTP_VENDOR_MAGIC)) 814 return -1; 815 816 popt += 4; 817 while ( *popt != 0xff ) { 818 if ( *popt == 53 ) /* DHCP Message Type */ 819 return *(popt + 2); 820 popt += *(popt + 1) + 2; /* Scan through all options */ 821 } 822 return -1; 823 } 824 825 static void DhcpSendRequestPkt(Bootp_t *bp_offer) 826 { 827 volatile uchar *pkt, *iphdr; 828 Bootp_t *bp; 829 int pktlen, iplen, extlen; 830 IPaddr_t OfferedIP; 831 832 debug ("DhcpSendRequestPkt: Sending DHCPREQUEST\n"); 833 pkt = NetTxPacket; 834 memset ((void*)pkt, 0, PKTSIZE); 835 836 pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP); 837 838 iphdr = pkt; /* We'll need this later to set proper pkt size */ 839 pkt += IP_HDR_SIZE; 840 841 bp = (Bootp_t *)pkt; 842 bp->bp_op = OP_BOOTREQUEST; 843 bp->bp_htype = HWT_ETHER; 844 bp->bp_hlen = HWL_ETHER; 845 bp->bp_hops = 0; 846 bp->bp_secs = htons(get_timer(0) / 1000); 847 /* Do not set the client IP, your IP, or server IP yet, since it hasn't been ACK'ed by 848 * the server yet */ 849 850 /* 851 * RFC3046 requires Relay Agents to discard packets with 852 * nonzero and offered giaddr 853 */ 854 NetWriteIP(&bp->bp_giaddr, 0); 855 856 memcpy (bp->bp_chaddr, NetOurEther, 6); 857 858 /* 859 * ID is the id of the OFFER packet 860 */ 861 862 NetCopyLong(&bp->bp_id, &bp_offer->bp_id); 863 864 /* 865 * Copy options from OFFER packet if present 866 */ 867 868 /* Copy offered IP into the parameters request list */ 869 NetCopyIP(&OfferedIP, &bp_offer->bp_yiaddr); 870 extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_REQUEST, NetDHCPServerIP, OfferedIP); 871 872 pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + extlen; 873 iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen; 874 NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); 875 876 debug ("Transmitting DHCPREQUEST packet: len = %d\n", pktlen); 877 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY 878 udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY); 879 #endif /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */ 880 NetSendPacket(NetTxPacket, pktlen); 881 } 882 883 /* 884 * Handle DHCP received packets. 885 */ 886 static void 887 DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len) 888 { 889 Bootp_t *bp = (Bootp_t *)pkt; 890 891 debug ("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n", 892 src, dest, len, dhcp_state); 893 894 if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */ 895 return; 896 897 debug ("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n", 898 src, dest, len, dhcp_state); 899 900 switch (dhcp_state) { 901 case SELECTING: 902 /* 903 * Wait an appropriate time for any potential DHCPOFFER packets 904 * to arrive. Then select one, and generate DHCPREQUEST response. 905 * If filename is in format we recognize, assume it is a valid 906 * OFFER from a server we want. 907 */ 908 debug ("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file); 909 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 910 if (strncmp(bp->bp_file, 911 CONFIG_SYS_BOOTFILE_PREFIX, 912 strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0 ) { 913 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 914 915 debug ("TRANSITIONING TO REQUESTING STATE\n"); 916 dhcp_state = REQUESTING; 917 918 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 919 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp); 920 921 NetSetTimeout(TIMEOUT, BootpTimeout); 922 DhcpSendRequestPkt(bp); 923 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 924 } 925 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 926 927 return; 928 break; 929 case REQUESTING: 930 debug ("DHCP State: REQUESTING\n"); 931 932 if ( DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK ) { 933 char *s; 934 935 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 936 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp); 937 BootpCopyNetParams(bp); /* Store net params from reply */ 938 dhcp_state = BOUND; 939 printf ("DHCP client bound to address %pI4\n", &NetOurIP); 940 941 /* Obey the 'autoload' setting */ 942 if ((s = getenv("autoload")) != NULL) { 943 if (*s == 'n') { 944 /* 945 * Just use BOOTP to configure system; 946 * Do not use TFTP to load the bootfile. 947 */ 948 NetState = NETLOOP_SUCCESS; 949 return; 950 #if defined(CONFIG_CMD_NFS) 951 } else if (strcmp(s, "NFS") == 0) { 952 /* 953 * Use NFS to load the bootfile. 954 */ 955 NfsStart(); 956 return; 957 #endif 958 } 959 } 960 TftpStart(); 961 return; 962 } 963 break; 964 case BOUND: 965 /* DHCP client bound to address */ 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 /* CONFIG_CMD_DHCP */ 979 980 #endif /* CONFIG_CMD_NET */ 981