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 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 232 case 42: /* NTP server IP */ 233 NetCopyIP(&NetNtpServerIP, (IPaddr_t *) (ext + 2)); 234 break; 235 #endif 236 /* Application layer fields */ 237 case 43: /* Vendor specific info - Not yet supported */ 238 /* 239 * Binary information to exchange specific 240 * product information. 241 */ 242 break; 243 /* Reserved (custom) fields (128..254) */ 244 } 245 } 246 247 static void BootpVendorProcess (u8 * ext, int size) 248 { 249 u8 *end = ext + size; 250 251 debug("[BOOTP] Checking extension (%d bytes)...\n", size); 252 253 while ((ext < end) && (*ext != 0xff)) { 254 if (*ext == 0) { 255 ext++; 256 } else { 257 u8 *opt = ext; 258 259 ext += ext[1] + 2; 260 if (ext <= end) 261 BootpVendorFieldProcess (opt); 262 } 263 } 264 265 debug("[BOOTP] Received fields: \n"); 266 if (NetOurSubnetMask) 267 debug("NetOurSubnetMask : %pI4\n", &NetOurSubnetMask); 268 269 if (NetOurGatewayIP) 270 debug("NetOurGatewayIP : %pI4", &NetOurGatewayIP); 271 272 if (NetBootFileSize) 273 debug("NetBootFileSize : %d\n", NetBootFileSize); 274 275 if (NetOurHostName[0]) 276 debug("NetOurHostName : %s\n", NetOurHostName); 277 278 if (NetOurRootPath[0]) 279 debug("NetOurRootPath : %s\n", NetOurRootPath); 280 281 if (NetOurNISDomain[0]) 282 debug("NetOurNISDomain : %s\n", NetOurNISDomain); 283 284 if (NetBootFileSize) 285 debug("NetBootFileSize: %d\n", NetBootFileSize); 286 287 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 288 if (NetNtpServerIP) 289 debug("NetNtpServerIP : %pI4\n", &NetNtpServerIP); 290 #endif 291 } 292 293 /* 294 * Handle a BOOTP received packet. 295 */ 296 static void 297 BootpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 298 unsigned len) 299 { 300 Bootp_t *bp; 301 302 debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n", 303 src, dest, len, sizeof (Bootp_t)); 304 305 bp = (Bootp_t *)pkt; 306 307 if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */ 308 return; 309 310 /* 311 * Got a good BOOTP reply. Copy the data into our variables. 312 */ 313 #ifdef CONFIG_STATUS_LED 314 status_led_set (STATUS_LED_BOOT, STATUS_LED_OFF); 315 #endif 316 317 BootpCopyNetParams(bp); /* Store net parameters from reply */ 318 319 /* Retrieve extended information (we must parse the vendor area) */ 320 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 321 BootpVendorProcess((uchar *)&bp->bp_vend[4], len); 322 323 NetSetTimeout(0, (thand_f *)0); 324 325 debug("Got good BOOTP\n"); 326 327 net_auto_load(); 328 } 329 #endif 330 331 /* 332 * Timeout on BOOTP/DHCP request. 333 */ 334 static void 335 BootpTimeout(void) 336 { 337 if (BootpTry >= TIMEOUT_COUNT) { 338 puts ("\nRetry count exceeded; starting again\n"); 339 NetStartAgain (); 340 } else { 341 NetSetTimeout (TIMEOUT, BootpTimeout); 342 BootpRequest (); 343 } 344 } 345 346 /* 347 * Initialize BOOTP extension fields in the request. 348 */ 349 #if defined(CONFIG_CMD_DHCP) 350 static int DhcpExtended (u8 * e, int message_type, IPaddr_t ServerID, IPaddr_t RequestedIP) 351 { 352 u8 *start = e; 353 u8 *cnt; 354 #if defined(CONFIG_BOOTP_PXE) 355 char *uuid; 356 size_t vci_strlen; 357 u16 clientarch; 358 #endif 359 360 #if defined(CONFIG_BOOTP_VENDOREX) 361 u8 *x; 362 #endif 363 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 364 char *hostname; 365 #endif 366 367 *e++ = 99; /* RFC1048 Magic Cookie */ 368 *e++ = 130; 369 *e++ = 83; 370 *e++ = 99; 371 372 *e++ = 53; /* DHCP Message Type */ 373 *e++ = 1; 374 *e++ = message_type; 375 376 *e++ = 57; /* Maximum DHCP Message Size */ 377 *e++ = 2; 378 *e++ = (576 - 312 + OPT_SIZE) >> 8; 379 *e++ = (576 - 312 + OPT_SIZE) & 0xff; 380 381 if (ServerID) { 382 int tmp = ntohl (ServerID); 383 384 *e++ = 54; /* ServerID */ 385 *e++ = 4; 386 *e++ = tmp >> 24; 387 *e++ = tmp >> 16; 388 *e++ = tmp >> 8; 389 *e++ = tmp & 0xff; 390 } 391 392 if (RequestedIP) { 393 int tmp = ntohl (RequestedIP); 394 395 *e++ = 50; /* Requested IP */ 396 *e++ = 4; 397 *e++ = tmp >> 24; 398 *e++ = tmp >> 16; 399 *e++ = tmp >> 8; 400 *e++ = tmp & 0xff; 401 } 402 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 403 if ((hostname = getenv ("hostname"))) { 404 int hostnamelen = strlen (hostname); 405 406 *e++ = 12; /* Hostname */ 407 *e++ = hostnamelen; 408 memcpy (e, hostname, hostnamelen); 409 e += hostnamelen; 410 } 411 #endif 412 413 #if defined(CONFIG_BOOTP_PXE) 414 clientarch = CONFIG_BOOTP_PXE_CLIENTARCH; 415 *e++ = 93; /* Client System Architecture */ 416 *e++ = 2; 417 *e++ = (clientarch >> 8) & 0xff; 418 *e++ = clientarch & 0xff; 419 420 *e++ = 94; /* Client Network Interface Identifier */ 421 *e++ = 3; 422 *e++ = 1; /* type field for UNDI */ 423 *e++ = 0; /* major revision */ 424 *e++ = 0; /* minor revision */ 425 426 uuid = getenv("pxeuuid"); 427 428 if (uuid) { 429 if (uuid_str_valid(uuid)) { 430 *e++ = 97; /* Client Machine Identifier */ 431 *e++ = 17; 432 *e++ = 0; /* type 0 - UUID */ 433 434 uuid_str_to_bin(uuid, e); 435 e += 16; 436 } else { 437 printf("Invalid pxeuuid: %s\n", uuid); 438 } 439 } 440 441 *e++ = 60; /* Vendor Class Identifier */ 442 vci_strlen = strlen(CONFIG_BOOTP_VCI_STRING); 443 *e++ = vci_strlen; 444 memcpy(e, CONFIG_BOOTP_VCI_STRING, vci_strlen); 445 e += vci_strlen; 446 #endif 447 448 #if defined(CONFIG_BOOTP_VENDOREX) 449 if ((x = dhcp_vendorex_prep (e))) 450 return x - start; 451 #endif 452 453 *e++ = 55; /* Parameter Request List */ 454 cnt = e++; /* Pointer to count of requested items */ 455 *cnt = 0; 456 #if defined(CONFIG_BOOTP_SUBNETMASK) 457 *e++ = 1; /* Subnet Mask */ 458 *cnt += 1; 459 #endif 460 #if defined(CONFIG_BOOTP_TIMEOFFSET) 461 *e++ = 2; 462 *cnt += 1; 463 #endif 464 #if defined(CONFIG_BOOTP_GATEWAY) 465 *e++ = 3; /* Router Option */ 466 *cnt += 1; 467 #endif 468 #if defined(CONFIG_BOOTP_DNS) 469 *e++ = 6; /* DNS Server(s) */ 470 *cnt += 1; 471 #endif 472 #if defined(CONFIG_BOOTP_HOSTNAME) 473 *e++ = 12; /* Hostname */ 474 *cnt += 1; 475 #endif 476 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 477 *e++ = 13; /* Boot File Size */ 478 *cnt += 1; 479 #endif 480 #if defined(CONFIG_BOOTP_BOOTPATH) 481 *e++ = 17; /* Boot path */ 482 *cnt += 1; 483 #endif 484 #if defined(CONFIG_BOOTP_NISDOMAIN) 485 *e++ = 40; /* NIS Domain name request */ 486 *cnt += 1; 487 #endif 488 #if defined(CONFIG_BOOTP_NTPSERVER) 489 *e++ = 42; 490 *cnt += 1; 491 #endif 492 /* no options, so back up to avoid sending an empty request list */ 493 if (*cnt == 0) 494 e -= 2; 495 496 *e++ = 255; /* End of the list */ 497 498 /* Pad to minimal length */ 499 #ifdef CONFIG_DHCP_MIN_EXT_LEN 500 while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN) 501 *e++ = 0; 502 #endif 503 504 return e - start; 505 } 506 507 #else 508 /* 509 * Warning: no field size check - change CONFIG_BOOTP_* at your own risk! 510 */ 511 static int BootpExtended (u8 * e) 512 { 513 u8 *start = e; 514 515 *e++ = 99; /* RFC1048 Magic Cookie */ 516 *e++ = 130; 517 *e++ = 83; 518 *e++ = 99; 519 520 #if defined(CONFIG_CMD_DHCP) 521 *e++ = 53; /* DHCP Message Type */ 522 *e++ = 1; 523 *e++ = DHCP_DISCOVER; 524 525 *e++ = 57; /* Maximum DHCP Message Size */ 526 *e++ = 2; 527 *e++ = (576 - 312 + OPT_SIZE) >> 16; 528 *e++ = (576 - 312 + OPT_SIZE) & 0xff; 529 #endif 530 531 #if defined(CONFIG_BOOTP_SUBNETMASK) 532 *e++ = 1; /* Subnet mask request */ 533 *e++ = 4; 534 e += 4; 535 #endif 536 537 #if defined(CONFIG_BOOTP_GATEWAY) 538 *e++ = 3; /* Default gateway request */ 539 *e++ = 4; 540 e += 4; 541 #endif 542 543 #if defined(CONFIG_BOOTP_DNS) 544 *e++ = 6; /* Domain Name Server */ 545 *e++ = 4; 546 e += 4; 547 #endif 548 549 #if defined(CONFIG_BOOTP_HOSTNAME) 550 *e++ = 12; /* Host name request */ 551 *e++ = 32; 552 e += 32; 553 #endif 554 555 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 556 *e++ = 13; /* Boot file size */ 557 *e++ = 2; 558 e += 2; 559 #endif 560 561 #if defined(CONFIG_BOOTP_BOOTPATH) 562 *e++ = 17; /* Boot path */ 563 *e++ = 32; 564 e += 32; 565 #endif 566 567 #if defined(CONFIG_BOOTP_NISDOMAIN) 568 *e++ = 40; /* NIS Domain name request */ 569 *e++ = 32; 570 e += 32; 571 #endif 572 #if defined(CONFIG_BOOTP_NTPSERVER) 573 *e++ = 42; 574 *e++ = 4; 575 e += 4; 576 #endif 577 578 *e++ = 255; /* End of the list */ 579 580 return e - start; 581 } 582 #endif 583 584 void 585 BootpRequest (void) 586 { 587 volatile uchar *pkt, *iphdr; 588 Bootp_t *bp; 589 int ext_len, pktlen, iplen; 590 591 #if defined(CONFIG_CMD_DHCP) 592 dhcp_state = INIT; 593 #endif 594 595 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */ 596 unsigned char bi_enetaddr[6]; 597 int reg; 598 ulong tst1, tst2, sum, m_mask, m_value = 0; 599 600 if (BootpTry ==0) { 601 /* get our mac */ 602 eth_getenv_enetaddr("ethaddr", bi_enetaddr); 603 604 debug("BootpRequest => Our Mac: "); 605 for (reg=0; reg<6; reg++) 606 debug("%x%c", bi_enetaddr[reg], reg==5 ? '\n' : ':'); 607 608 /* Mac-Manipulation 2 get seed1 */ 609 tst1=0; 610 tst2=0; 611 for (reg=2; reg<6; reg++) { 612 tst1 = tst1 << 8; 613 tst1 = tst1 | bi_enetaddr[reg]; 614 } 615 for (reg=0; reg<2; reg++) { 616 tst2 = tst2 | bi_enetaddr[reg]; 617 tst2 = tst2 << 8; 618 } 619 620 seed1 = tst1^tst2; 621 622 /* Mirror seed1*/ 623 m_mask=0x1; 624 for (reg=1;reg<=32;reg++) { 625 m_value |= (m_mask & seed1); 626 seed1 = seed1 >> 1; 627 m_value = m_value << 1; 628 } 629 seed1 = m_value; 630 seed2 = 0xB78D0945; 631 } 632 633 /* Random Number Generator */ 634 635 for (reg=0;reg<=0;reg++) { 636 sum = seed1 + seed2; 637 if (sum < seed1 || sum < seed2) 638 sum++; 639 seed2 = seed1; 640 seed1 = sum; 641 642 if (BootpTry<=2) { /* Start with max 1024 * 1ms */ 643 sum = sum >> (22-BootpTry); 644 } else { /*After 3rd BOOTP request max 8192 * 1ms */ 645 sum = sum >> 19; 646 } 647 } 648 649 printf ("Random delay: %ld ms...\n", sum); 650 for (reg=0; reg <sum; reg++) { 651 udelay(1000); /*Wait 1ms*/ 652 } 653 #endif /* CONFIG_BOOTP_RANDOM_DELAY */ 654 655 printf("BOOTP broadcast %d\n", ++BootpTry); 656 pkt = NetTxPacket; 657 memset ((void*)pkt, 0, PKTSIZE); 658 659 pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP); 660 661 /* 662 * Next line results in incorrect packet size being transmitted, resulting 663 * in errors in some DHCP servers, reporting missing bytes. Size must be 664 * set in packet header after extension length has been determined. 665 * C. Hallinan, DS4.COM, Inc. 666 */ 667 /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */ 668 iphdr = pkt; /* We need this later for NetSetIP() */ 669 pkt += IP_HDR_SIZE; 670 671 bp = (Bootp_t *)pkt; 672 bp->bp_op = OP_BOOTREQUEST; 673 bp->bp_htype = HWT_ETHER; 674 bp->bp_hlen = HWL_ETHER; 675 bp->bp_hops = 0; 676 bp->bp_secs = htons(get_timer(0) / 1000); 677 NetWriteIP(&bp->bp_ciaddr, 0); 678 NetWriteIP(&bp->bp_yiaddr, 0); 679 NetWriteIP(&bp->bp_siaddr, 0); 680 NetWriteIP(&bp->bp_giaddr, 0); 681 memcpy (bp->bp_chaddr, NetOurEther, 6); 682 copy_filename (bp->bp_file, BootFile, sizeof(bp->bp_file)); 683 684 /* Request additional information from the BOOTP/DHCP server */ 685 #if defined(CONFIG_CMD_DHCP) 686 ext_len = DhcpExtended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0); 687 #else 688 ext_len = BootpExtended((u8 *)bp->bp_vend); 689 #endif 690 691 /* 692 * Bootp ID is the lower 4 bytes of our ethernet address 693 * plus the current time in ms. 694 */ 695 BootpID = ((ulong)NetOurEther[2] << 24) 696 | ((ulong)NetOurEther[3] << 16) 697 | ((ulong)NetOurEther[4] << 8) 698 | (ulong)NetOurEther[5]; 699 BootpID += get_timer(0); 700 BootpID = htonl(BootpID); 701 NetCopyLong(&bp->bp_id, &BootpID); 702 703 /* 704 * Calculate proper packet lengths taking into account the 705 * variable size of the options field 706 */ 707 pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len; 708 iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len; 709 NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); 710 NetSetTimeout(SELECT_TIMEOUT, BootpTimeout); 711 712 #if defined(CONFIG_CMD_DHCP) 713 dhcp_state = SELECTING; 714 NetSetHandler(DhcpHandler); 715 #else 716 NetSetHandler(BootpHandler); 717 #endif 718 NetSendPacket(NetTxPacket, pktlen); 719 } 720 721 #if defined(CONFIG_CMD_DHCP) 722 static void DhcpOptionsProcess (uchar * popt, Bootp_t *bp) 723 { 724 uchar *end = popt + BOOTP_HDR_SIZE; 725 int oplen, size; 726 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 727 int *to_ptr; 728 #endif 729 730 while (popt < end && *popt != 0xff) { 731 oplen = *(popt + 1); 732 switch (*popt) { 733 case 1: 734 NetCopyIP (&NetOurSubnetMask, (popt + 2)); 735 break; 736 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 737 case 2: /* Time offset */ 738 to_ptr = &NetTimeOffset; 739 NetCopyLong ((ulong *)to_ptr, (ulong *)(popt + 2)); 740 NetTimeOffset = ntohl (NetTimeOffset); 741 break; 742 #endif 743 case 3: 744 NetCopyIP (&NetOurGatewayIP, (popt + 2)); 745 break; 746 case 6: 747 NetCopyIP (&NetOurDNSIP, (popt + 2)); 748 #if defined(CONFIG_BOOTP_DNS2) 749 if (*(popt + 1) > 4) { 750 NetCopyIP (&NetOurDNS2IP, (popt + 2 + 4)); 751 } 752 #endif 753 break; 754 case 12: 755 size = truncate_sz ("Host Name", sizeof (NetOurHostName), oplen); 756 memcpy (&NetOurHostName, popt + 2, size); 757 NetOurHostName[size] = 0; 758 break; 759 case 15: /* Ignore Domain Name Option */ 760 break; 761 case 17: 762 size = truncate_sz ("Root Path", sizeof (NetOurRootPath), oplen); 763 memcpy (&NetOurRootPath, popt + 2, size); 764 NetOurRootPath[size] = 0; 765 break; 766 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 767 case 42: /* NTP server IP */ 768 NetCopyIP (&NetNtpServerIP, (popt + 2)); 769 break; 770 #endif 771 case 51: 772 NetCopyLong (&dhcp_leasetime, (ulong *) (popt + 2)); 773 break; 774 case 53: /* Ignore Message Type Option */ 775 break; 776 case 54: 777 NetCopyIP (&NetDHCPServerIP, (popt + 2)); 778 break; 779 case 58: /* Ignore Renewal Time Option */ 780 break; 781 case 59: /* Ignore Rebinding Time Option */ 782 break; 783 case 66: /* Ignore TFTP server name */ 784 break; 785 case 67: /* vendor opt bootfile */ 786 /* 787 * I can't use dhcp_vendorex_proc here because I need 788 * to write into the bootp packet - even then I had to 789 * pass the bootp packet pointer into here as the 790 * second arg 791 */ 792 size = truncate_sz ("Opt Boot File", 793 sizeof(bp->bp_file), 794 oplen); 795 if (bp->bp_file[0] == '\0' && size > 0) { 796 /* 797 * only use vendor boot file if we didn't 798 * receive a boot file in the main non-vendor 799 * part of the packet - god only knows why 800 * some vendors chose not to use this perfectly 801 * good spot to store the boot file (join on 802 * Tru64 Unix) it seems mind bogglingly crazy 803 * to me 804 */ 805 printf("*** WARNING: using vendor " 806 "optional boot file\n"); 807 memcpy(bp->bp_file, popt + 2, size); 808 bp->bp_file[size] = '\0'; 809 } 810 break; 811 default: 812 #if defined(CONFIG_BOOTP_VENDOREX) 813 if (dhcp_vendorex_proc (popt)) 814 break; 815 #endif 816 printf ("*** Unhandled DHCP Option in OFFER/ACK: %d\n", *popt); 817 break; 818 } 819 popt += oplen + 2; /* Process next option */ 820 } 821 } 822 823 static int DhcpMessageType(unsigned char *popt) 824 { 825 if (NetReadLong((ulong*)popt) != htonl(BOOTP_VENDOR_MAGIC)) 826 return -1; 827 828 popt += 4; 829 while ( *popt != 0xff ) { 830 if ( *popt == 53 ) /* DHCP Message Type */ 831 return *(popt + 2); 832 popt += *(popt + 1) + 2; /* Scan through all options */ 833 } 834 return -1; 835 } 836 837 static void DhcpSendRequestPkt(Bootp_t *bp_offer) 838 { 839 volatile uchar *pkt, *iphdr; 840 Bootp_t *bp; 841 int pktlen, iplen, extlen; 842 IPaddr_t OfferedIP; 843 844 debug("DhcpSendRequestPkt: Sending DHCPREQUEST\n"); 845 pkt = NetTxPacket; 846 memset ((void*)pkt, 0, PKTSIZE); 847 848 pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP); 849 850 iphdr = pkt; /* We'll need this later to set proper pkt size */ 851 pkt += IP_HDR_SIZE; 852 853 bp = (Bootp_t *)pkt; 854 bp->bp_op = OP_BOOTREQUEST; 855 bp->bp_htype = HWT_ETHER; 856 bp->bp_hlen = HWL_ETHER; 857 bp->bp_hops = 0; 858 bp->bp_secs = htons(get_timer(0) / 1000); 859 /* Do not set the client IP, your IP, or server IP yet, since it hasn't been ACK'ed by 860 * the server yet */ 861 862 /* 863 * RFC3046 requires Relay Agents to discard packets with 864 * nonzero and offered giaddr 865 */ 866 NetWriteIP(&bp->bp_giaddr, 0); 867 868 memcpy (bp->bp_chaddr, NetOurEther, 6); 869 870 /* 871 * ID is the id of the OFFER packet 872 */ 873 874 NetCopyLong(&bp->bp_id, &bp_offer->bp_id); 875 876 /* 877 * Copy options from OFFER packet if present 878 */ 879 880 /* Copy offered IP into the parameters request list */ 881 NetCopyIP(&OfferedIP, &bp_offer->bp_yiaddr); 882 extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_REQUEST, NetDHCPServerIP, OfferedIP); 883 884 pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen; 885 iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen; 886 NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); 887 888 debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen); 889 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY 890 udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY); 891 #endif /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */ 892 NetSendPacket(NetTxPacket, pktlen); 893 } 894 895 /* 896 * Handle DHCP received packets. 897 */ 898 static void 899 DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 900 unsigned len) 901 { 902 Bootp_t *bp = (Bootp_t *)pkt; 903 904 debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n", 905 src, dest, len, dhcp_state); 906 907 if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */ 908 return; 909 910 debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n", 911 src, dest, len, dhcp_state); 912 913 switch (dhcp_state) { 914 case SELECTING: 915 /* 916 * Wait an appropriate time for any potential DHCPOFFER packets 917 * to arrive. Then select one, and generate DHCPREQUEST response. 918 * If filename is in format we recognize, assume it is a valid 919 * OFFER from a server we want. 920 */ 921 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file); 922 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 923 if (strncmp(bp->bp_file, 924 CONFIG_SYS_BOOTFILE_PREFIX, 925 strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0 ) { 926 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 927 928 debug("TRANSITIONING TO REQUESTING STATE\n"); 929 dhcp_state = REQUESTING; 930 931 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 932 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp); 933 934 NetSetTimeout(TIMEOUT, BootpTimeout); 935 DhcpSendRequestPkt(bp); 936 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 937 } 938 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 939 940 return; 941 break; 942 case REQUESTING: 943 debug("DHCP State: REQUESTING\n"); 944 945 if ( DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK ) { 946 if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 947 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp); 948 BootpCopyNetParams(bp); /* Store net params from reply */ 949 dhcp_state = BOUND; 950 printf ("DHCP client bound to address %pI4\n", &NetOurIP); 951 952 net_auto_load(); 953 return; 954 } 955 break; 956 case BOUND: 957 /* DHCP client bound to address */ 958 break; 959 default: 960 puts ("DHCP: INVALID STATE\n"); 961 break; 962 } 963 964 } 965 966 void DhcpRequest(void) 967 { 968 BootpRequest(); 969 } 970 #endif /* CONFIG_CMD_DHCP */ 971