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