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 #include <linux/compiler.h> 21 22 #define BOOTP_VENDOR_MAGIC 0x63825363 /* RFC1048 Magic Cookie */ 23 24 #define TIMEOUT 5000UL /* Milliseconds before trying BOOTP again */ 25 #ifndef CONFIG_NET_RETRY_COUNT 26 # define TIMEOUT_COUNT 5 /* # of timeouts before giving up */ 27 #else 28 # define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT) 29 #endif 30 31 #define PORT_BOOTPS 67 /* BOOTP server UDP port */ 32 #define PORT_BOOTPC 68 /* BOOTP client UDP port */ 33 34 #ifndef CONFIG_DHCP_MIN_EXT_LEN /* minimal length of extension list */ 35 #define CONFIG_DHCP_MIN_EXT_LEN 64 36 #endif 37 38 ulong BootpID; 39 int BootpTry; 40 #ifdef CONFIG_BOOTP_RANDOM_DELAY 41 ulong seed1, seed2; 42 #endif 43 44 #if defined(CONFIG_CMD_DHCP) 45 dhcp_state_t dhcp_state = INIT; 46 unsigned long dhcp_leasetime; 47 IPaddr_t NetDHCPServerIP; 48 static void DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 49 unsigned len); 50 51 /* For Debug */ 52 #if 0 53 static char *dhcpmsg2str(int type) 54 { 55 switch (type) { 56 case 1: return "DHCPDISCOVER"; break; 57 case 2: return "DHCPOFFER"; break; 58 case 3: return "DHCPREQUEST"; break; 59 case 4: return "DHCPDECLINE"; break; 60 case 5: return "DHCPACK"; break; 61 case 6: return "DHCPNACK"; break; 62 case 7: return "DHCPRELEASE"; break; 63 default: return "UNKNOWN/INVALID MSG TYPE"; break; 64 } 65 } 66 #endif 67 #endif 68 69 static int BootpCheckPkt(uchar *pkt, unsigned dest, unsigned src, unsigned len) 70 { 71 struct Bootp_t *bp = (struct Bootp_t *) pkt; 72 int retval = 0; 73 74 if (dest != PORT_BOOTPC || src != PORT_BOOTPS) 75 retval = -1; 76 else if (len < sizeof(struct Bootp_t) - OPT_SIZE) 77 retval = -2; 78 else if (bp->bp_op != OP_BOOTREQUEST && 79 bp->bp_op != OP_BOOTREPLY && 80 bp->bp_op != DHCP_OFFER && 81 bp->bp_op != DHCP_ACK && 82 bp->bp_op != DHCP_NAK) 83 retval = -3; 84 else if (bp->bp_htype != HWT_ETHER) 85 retval = -4; 86 else if (bp->bp_hlen != HWL_ETHER) 87 retval = -5; 88 else if (NetReadLong((ulong *)&bp->bp_id) != BootpID) 89 retval = -6; 90 91 debug("Filtering pkt = %d\n", retval); 92 93 return retval; 94 } 95 96 /* 97 * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet 98 */ 99 static void BootpCopyNetParams(struct Bootp_t *bp) 100 { 101 __maybe_unused IPaddr_t tmp_ip; 102 103 NetCopyIP(&NetOurIP, &bp->bp_yiaddr); 104 #if !defined(CONFIG_BOOTP_SERVERIP) 105 NetCopyIP(&tmp_ip, &bp->bp_siaddr); 106 if (tmp_ip != 0) 107 NetCopyIP(&NetServerIP, &bp->bp_siaddr); 108 memcpy(NetServerEther, ((Ethernet_t *)NetRxPacket)->et_src, 6); 109 #endif 110 if (strlen(bp->bp_file) > 0) 111 copy_filename(BootFile, bp->bp_file, sizeof(BootFile)); 112 113 debug("Bootfile: %s\n", BootFile); 114 115 /* Propagate to environment: 116 * don't delete exising entry when BOOTP / DHCP reply does 117 * not contain a new value 118 */ 119 if (*BootFile) 120 setenv("bootfile", BootFile); 121 } 122 123 static int truncate_sz(const char *name, int maxlen, int curlen) 124 { 125 if (curlen >= maxlen) { 126 printf("*** WARNING: %s is too long (%d - max: %d)" 127 " - truncated\n", name, curlen, maxlen); 128 curlen = maxlen - 1; 129 } 130 return curlen; 131 } 132 133 #if !defined(CONFIG_CMD_DHCP) 134 135 static void BootpVendorFieldProcess(u8 *ext) 136 { 137 int size = *(ext + 1); 138 139 debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext, 140 *(ext + 1)); 141 142 NetBootFileSize = 0; 143 144 switch (*ext) { 145 /* Fixed length fields */ 146 case 1: /* Subnet mask */ 147 if (NetOurSubnetMask == 0) 148 NetCopyIP(&NetOurSubnetMask, (IPaddr_t *) (ext + 2)); 149 break; 150 case 2: /* Time offset - Not yet supported */ 151 break; 152 /* Variable length fields */ 153 case 3: /* Gateways list */ 154 if (NetOurGatewayIP == 0) 155 NetCopyIP(&NetOurGatewayIP, (IPaddr_t *) (ext + 2)); 156 break; 157 case 4: /* Time server - Not yet supported */ 158 break; 159 case 5: /* IEN-116 name server - Not yet supported */ 160 break; 161 case 6: 162 if (NetOurDNSIP == 0) 163 NetCopyIP(&NetOurDNSIP, (IPaddr_t *) (ext + 2)); 164 #if defined(CONFIG_BOOTP_DNS2) 165 if ((NetOurDNS2IP == 0) && (size > 4)) 166 NetCopyIP(&NetOurDNS2IP, (IPaddr_t *) (ext + 2 + 4)); 167 #endif 168 break; 169 case 7: /* Log server - Not yet supported */ 170 break; 171 case 8: /* Cookie/Quote server - Not yet supported */ 172 break; 173 case 9: /* LPR server - Not yet supported */ 174 break; 175 case 10: /* Impress server - Not yet supported */ 176 break; 177 case 11: /* RPL server - Not yet supported */ 178 break; 179 case 12: /* Host name */ 180 if (NetOurHostName[0] == 0) { 181 size = truncate_sz("Host Name", 182 sizeof(NetOurHostName), size); 183 memcpy(&NetOurHostName, ext + 2, size); 184 NetOurHostName[size] = 0; 185 } 186 break; 187 case 13: /* Boot file size */ 188 if (size == 2) 189 NetBootFileSize = ntohs(*(ushort *) (ext + 2)); 190 else if (size == 4) 191 NetBootFileSize = ntohl(*(ulong *) (ext + 2)); 192 break; 193 case 14: /* Merit dump file - Not yet supported */ 194 break; 195 case 15: /* Domain name - Not yet supported */ 196 break; 197 case 16: /* Swap server - Not yet supported */ 198 break; 199 case 17: /* Root path */ 200 if (NetOurRootPath[0] == 0) { 201 size = truncate_sz("Root Path", 202 sizeof(NetOurRootPath), size); 203 memcpy(&NetOurRootPath, ext + 2, size); 204 NetOurRootPath[size] = 0; 205 } 206 break; 207 case 18: /* Extension path - Not yet supported */ 208 /* 209 * This can be used to send the information of the 210 * vendor area in another file that the client can 211 * access via TFTP. 212 */ 213 break; 214 /* IP host layer fields */ 215 case 40: /* NIS Domain name */ 216 if (NetOurNISDomain[0] == 0) { 217 size = truncate_sz("NIS Domain Name", 218 sizeof(NetOurNISDomain), size); 219 memcpy(&NetOurNISDomain, ext + 2, size); 220 NetOurNISDomain[size] = 0; 221 } 222 break; 223 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 224 case 42: /* NTP server IP */ 225 NetCopyIP(&NetNtpServerIP, (IPaddr_t *) (ext + 2)); 226 break; 227 #endif 228 /* Application layer fields */ 229 case 43: /* Vendor specific info - Not yet supported */ 230 /* 231 * Binary information to exchange specific 232 * product information. 233 */ 234 break; 235 /* Reserved (custom) fields (128..254) */ 236 } 237 } 238 239 static void BootpVendorProcess(u8 *ext, int size) 240 { 241 u8 *end = ext + size; 242 243 debug("[BOOTP] Checking extension (%d bytes)...\n", size); 244 245 while ((ext < end) && (*ext != 0xff)) { 246 if (*ext == 0) { 247 ext++; 248 } else { 249 u8 *opt = ext; 250 251 ext += ext[1] + 2; 252 if (ext <= end) 253 BootpVendorFieldProcess(opt); 254 } 255 } 256 257 debug("[BOOTP] Received fields:\n"); 258 if (NetOurSubnetMask) 259 debug("NetOurSubnetMask : %pI4\n", &NetOurSubnetMask); 260 261 if (NetOurGatewayIP) 262 debug("NetOurGatewayIP : %pI4", &NetOurGatewayIP); 263 264 if (NetBootFileSize) 265 debug("NetBootFileSize : %d\n", NetBootFileSize); 266 267 if (NetOurHostName[0]) 268 debug("NetOurHostName : %s\n", NetOurHostName); 269 270 if (NetOurRootPath[0]) 271 debug("NetOurRootPath : %s\n", NetOurRootPath); 272 273 if (NetOurNISDomain[0]) 274 debug("NetOurNISDomain : %s\n", NetOurNISDomain); 275 276 if (NetBootFileSize) 277 debug("NetBootFileSize: %d\n", NetBootFileSize); 278 279 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 280 if (NetNtpServerIP) 281 debug("NetNtpServerIP : %pI4\n", &NetNtpServerIP); 282 #endif 283 } 284 285 /* 286 * Handle a BOOTP received packet. 287 */ 288 static void 289 BootpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 290 unsigned len) 291 { 292 struct Bootp_t *bp; 293 294 debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n", 295 src, dest, len, sizeof(struct Bootp_t)); 296 297 bp = (struct Bootp_t *)pkt; 298 299 /* Filter out pkts we don't want */ 300 if (BootpCheckPkt(pkt, dest, src, len)) 301 return; 302 303 /* 304 * Got a good BOOTP reply. Copy the data into our variables. 305 */ 306 #ifdef CONFIG_STATUS_LED 307 status_led_set(STATUS_LED_BOOT, STATUS_LED_OFF); 308 #endif 309 310 BootpCopyNetParams(bp); /* Store net parameters from reply */ 311 312 /* Retrieve extended information (we must parse the vendor area) */ 313 if (NetReadLong((ulong *)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 314 BootpVendorProcess((uchar *)&bp->bp_vend[4], len); 315 316 NetSetTimeout(0, (thand_f *)0); 317 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop"); 318 319 debug("Got good BOOTP\n"); 320 321 net_auto_load(); 322 } 323 #endif 324 325 /* 326 * Timeout on BOOTP/DHCP request. 327 */ 328 static void 329 BootpTimeout(void) 330 { 331 if (BootpTry >= TIMEOUT_COUNT) { 332 puts("\nRetry count exceeded; starting again\n"); 333 NetStartAgain(); 334 } else { 335 NetSetTimeout(TIMEOUT, BootpTimeout); 336 BootpRequest(); 337 } 338 } 339 340 /* 341 * Initialize BOOTP extension fields in the request. 342 */ 343 #if defined(CONFIG_CMD_DHCP) 344 static int DhcpExtended(u8 *e, int message_type, IPaddr_t ServerID, 345 IPaddr_t RequestedIP) 346 { 347 u8 *start = e; 348 u8 *cnt; 349 #if defined(CONFIG_BOOTP_PXE) 350 char *uuid; 351 size_t vci_strlen; 352 u16 clientarch; 353 #endif 354 355 #if defined(CONFIG_BOOTP_VENDOREX) 356 u8 *x; 357 #endif 358 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 359 char *hostname; 360 #endif 361 362 *e++ = 99; /* RFC1048 Magic Cookie */ 363 *e++ = 130; 364 *e++ = 83; 365 *e++ = 99; 366 367 *e++ = 53; /* DHCP Message Type */ 368 *e++ = 1; 369 *e++ = message_type; 370 371 *e++ = 57; /* Maximum DHCP Message Size */ 372 *e++ = 2; 373 *e++ = (576 - 312 + OPT_SIZE) >> 8; 374 *e++ = (576 - 312 + OPT_SIZE) & 0xff; 375 376 if (ServerID) { 377 int tmp = ntohl(ServerID); 378 379 *e++ = 54; /* ServerID */ 380 *e++ = 4; 381 *e++ = tmp >> 24; 382 *e++ = tmp >> 16; 383 *e++ = tmp >> 8; 384 *e++ = tmp & 0xff; 385 } 386 387 if (RequestedIP) { 388 int tmp = ntohl(RequestedIP); 389 390 *e++ = 50; /* Requested IP */ 391 *e++ = 4; 392 *e++ = tmp >> 24; 393 *e++ = tmp >> 16; 394 *e++ = tmp >> 8; 395 *e++ = tmp & 0xff; 396 } 397 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 398 hostname = getenv("hostname"); 399 if (hostname) { 400 int hostnamelen = strlen(hostname); 401 402 *e++ = 12; /* Hostname */ 403 *e++ = hostnamelen; 404 memcpy(e, hostname, hostnamelen); 405 e += hostnamelen; 406 } 407 #endif 408 409 #if defined(CONFIG_BOOTP_PXE) 410 clientarch = CONFIG_BOOTP_PXE_CLIENTARCH; 411 *e++ = 93; /* Client System Architecture */ 412 *e++ = 2; 413 *e++ = (clientarch >> 8) & 0xff; 414 *e++ = clientarch & 0xff; 415 416 *e++ = 94; /* Client Network Interface Identifier */ 417 *e++ = 3; 418 *e++ = 1; /* type field for UNDI */ 419 *e++ = 0; /* major revision */ 420 *e++ = 0; /* minor revision */ 421 422 uuid = getenv("pxeuuid"); 423 424 if (uuid) { 425 if (uuid_str_valid(uuid)) { 426 *e++ = 97; /* Client Machine Identifier */ 427 *e++ = 17; 428 *e++ = 0; /* type 0 - UUID */ 429 430 uuid_str_to_bin(uuid, e); 431 e += 16; 432 } else { 433 printf("Invalid pxeuuid: %s\n", uuid); 434 } 435 } 436 437 *e++ = 60; /* Vendor Class Identifier */ 438 vci_strlen = strlen(CONFIG_BOOTP_VCI_STRING); 439 *e++ = vci_strlen; 440 memcpy(e, CONFIG_BOOTP_VCI_STRING, vci_strlen); 441 e += vci_strlen; 442 #endif 443 444 #if defined(CONFIG_BOOTP_VENDOREX) 445 x = dhcp_vendorex_prep(e); 446 if (x) 447 return x - start; 448 #endif 449 450 *e++ = 55; /* Parameter Request List */ 451 cnt = e++; /* Pointer to count of requested items */ 452 *cnt = 0; 453 #if defined(CONFIG_BOOTP_SUBNETMASK) 454 *e++ = 1; /* Subnet Mask */ 455 *cnt += 1; 456 #endif 457 #if defined(CONFIG_BOOTP_TIMEOFFSET) 458 *e++ = 2; 459 *cnt += 1; 460 #endif 461 #if defined(CONFIG_BOOTP_GATEWAY) 462 *e++ = 3; /* Router Option */ 463 *cnt += 1; 464 #endif 465 #if defined(CONFIG_BOOTP_DNS) 466 *e++ = 6; /* DNS Server(s) */ 467 *cnt += 1; 468 #endif 469 #if defined(CONFIG_BOOTP_HOSTNAME) 470 *e++ = 12; /* Hostname */ 471 *cnt += 1; 472 #endif 473 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 474 *e++ = 13; /* Boot File Size */ 475 *cnt += 1; 476 #endif 477 #if defined(CONFIG_BOOTP_BOOTPATH) 478 *e++ = 17; /* Boot path */ 479 *cnt += 1; 480 #endif 481 #if defined(CONFIG_BOOTP_NISDOMAIN) 482 *e++ = 40; /* NIS Domain name request */ 483 *cnt += 1; 484 #endif 485 #if defined(CONFIG_BOOTP_NTPSERVER) 486 *e++ = 42; 487 *cnt += 1; 488 #endif 489 /* no options, so back up to avoid sending an empty request list */ 490 if (*cnt == 0) 491 e -= 2; 492 493 *e++ = 255; /* End of the list */ 494 495 /* Pad to minimal length */ 496 #ifdef CONFIG_DHCP_MIN_EXT_LEN 497 while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN) 498 *e++ = 0; 499 #endif 500 501 return e - start; 502 } 503 504 #else 505 /* 506 * Warning: no field size check - change CONFIG_BOOTP_* at your own risk! 507 */ 508 static int BootpExtended(u8 *e) 509 { 510 u8 *start = e; 511 512 *e++ = 99; /* RFC1048 Magic Cookie */ 513 *e++ = 130; 514 *e++ = 83; 515 *e++ = 99; 516 517 #if defined(CONFIG_CMD_DHCP) 518 *e++ = 53; /* DHCP Message Type */ 519 *e++ = 1; 520 *e++ = DHCP_DISCOVER; 521 522 *e++ = 57; /* Maximum DHCP Message Size */ 523 *e++ = 2; 524 *e++ = (576 - 312 + OPT_SIZE) >> 16; 525 *e++ = (576 - 312 + OPT_SIZE) & 0xff; 526 #endif 527 528 #if defined(CONFIG_BOOTP_SUBNETMASK) 529 *e++ = 1; /* Subnet mask request */ 530 *e++ = 4; 531 e += 4; 532 #endif 533 534 #if defined(CONFIG_BOOTP_GATEWAY) 535 *e++ = 3; /* Default gateway request */ 536 *e++ = 4; 537 e += 4; 538 #endif 539 540 #if defined(CONFIG_BOOTP_DNS) 541 *e++ = 6; /* Domain Name Server */ 542 *e++ = 4; 543 e += 4; 544 #endif 545 546 #if defined(CONFIG_BOOTP_HOSTNAME) 547 *e++ = 12; /* Host name request */ 548 *e++ = 32; 549 e += 32; 550 #endif 551 552 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 553 *e++ = 13; /* Boot file size */ 554 *e++ = 2; 555 e += 2; 556 #endif 557 558 #if defined(CONFIG_BOOTP_BOOTPATH) 559 *e++ = 17; /* Boot path */ 560 *e++ = 32; 561 e += 32; 562 #endif 563 564 #if defined(CONFIG_BOOTP_NISDOMAIN) 565 *e++ = 40; /* NIS Domain name request */ 566 *e++ = 32; 567 e += 32; 568 #endif 569 #if defined(CONFIG_BOOTP_NTPSERVER) 570 *e++ = 42; 571 *e++ = 4; 572 e += 4; 573 #endif 574 575 *e++ = 255; /* End of the list */ 576 577 return e - start; 578 } 579 #endif 580 581 void 582 BootpRequest(void) 583 { 584 uchar *pkt, *iphdr; 585 struct Bootp_t *bp; 586 int ext_len, pktlen, iplen; 587 588 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start"); 589 #if defined(CONFIG_CMD_DHCP) 590 dhcp_state = INIT; 591 #endif 592 593 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */ 594 unsigned char bi_enetaddr[6]; 595 int reg; 596 ulong tst1, tst2, sum, m_mask, m_value = 0; 597 598 if (BootpTry == 0) { 599 /* get our mac */ 600 eth_getenv_enetaddr("ethaddr", bi_enetaddr); 601 602 debug("BootpRequest => Our Mac: "); 603 for (reg = 0; reg < 6; reg++) 604 debug("%x%c", bi_enetaddr[reg], reg == 5 ? '\n' : ':'); 605 606 /* Mac-Manipulation 2 get seed1 */ 607 tst1 = 0; 608 tst2 = 0; 609 for (reg = 2; reg < 6; reg++) { 610 tst1 = tst1 << 8; 611 tst1 = tst1 | bi_enetaddr[reg]; 612 } 613 for (reg = 0; reg < 2; reg++) { 614 tst2 = tst2 | bi_enetaddr[reg]; 615 tst2 = tst2 << 8; 616 } 617 618 seed1 = tst1^tst2; 619 620 /* Mirror seed1*/ 621 m_mask = 0x1; 622 for (reg = 1; reg <= 32; reg++) { 623 m_value |= (m_mask & seed1); 624 seed1 = seed1 >> 1; 625 m_value = m_value << 1; 626 } 627 seed1 = m_value; 628 seed2 = 0xB78D0945; 629 } 630 631 /* Random Number Generator */ 632 for (reg = 0; reg <= 0; reg++) { 633 sum = seed1 + seed2; 634 if (sum < seed1 || sum < seed2) 635 sum++; 636 seed2 = seed1; 637 seed1 = sum; 638 639 if (BootpTry <= 2) { /* Start with max 1024 * 1ms */ 640 sum = sum >> (22-BootpTry); 641 } else { /*After 3rd BOOTP request max 8192 * 1ms */ 642 sum = sum >> 19; 643 } 644 } 645 646 printf("Random delay: %ld ms...\n", sum); 647 for (reg = 0; reg < sum; reg++) 648 udelay(1000); /*Wait 1ms*/ 649 650 #endif /* CONFIG_BOOTP_RANDOM_DELAY */ 651 652 printf("BOOTP broadcast %d\n", ++BootpTry); 653 pkt = NetTxPacket; 654 memset((void *)pkt, 0, PKTSIZE); 655 656 pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP); 657 658 /* 659 * Next line results in incorrect packet size being transmitted, 660 * resulting in errors in some DHCP servers, reporting missing bytes. 661 * Size must be set in packet header after extension length has been 662 * determined. 663 * C. Hallinan, DS4.COM, Inc. 664 */ 665 /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, 666 sizeof (struct Bootp_t)); */ 667 iphdr = pkt; /* We need this later for NetSetIP() */ 668 pkt += IP_HDR_SIZE; 669 670 bp = (struct Bootp_t *)pkt; 671 bp->bp_op = OP_BOOTREQUEST; 672 bp->bp_htype = HWT_ETHER; 673 bp->bp_hlen = HWL_ETHER; 674 bp->bp_hops = 0; 675 bp->bp_secs = htons(get_timer(0) / 1000); 676 NetWriteIP(&bp->bp_ciaddr, 0); 677 NetWriteIP(&bp->bp_yiaddr, 0); 678 NetWriteIP(&bp->bp_siaddr, 0); 679 NetWriteIP(&bp->bp_giaddr, 0); 680 memcpy(bp->bp_chaddr, NetOurEther, 6); 681 copy_filename(bp->bp_file, BootFile, sizeof(bp->bp_file)); 682 683 /* Request additional information from the BOOTP/DHCP server */ 684 #if defined(CONFIG_CMD_DHCP) 685 ext_len = DhcpExtended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0); 686 #else 687 ext_len = BootpExtended((u8 *)bp->bp_vend); 688 #endif 689 690 /* 691 * Bootp ID is the lower 4 bytes of our ethernet address 692 * plus the current time in ms. 693 */ 694 BootpID = ((ulong)NetOurEther[2] << 24) 695 | ((ulong)NetOurEther[3] << 16) 696 | ((ulong)NetOurEther[4] << 8) 697 | (ulong)NetOurEther[5]; 698 BootpID += get_timer(0); 699 BootpID = htonl(BootpID); 700 NetCopyLong(&bp->bp_id, &BootpID); 701 702 /* 703 * Calculate proper packet lengths taking into account the 704 * variable size of the options field 705 */ 706 pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_SIZE - 707 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, struct 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 #endif 752 break; 753 case 12: 754 size = truncate_sz("Host Name", 755 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", 763 sizeof(NetOurRootPath), oplen); 764 memcpy(&NetOurRootPath, popt + 2, size); 765 NetOurRootPath[size] = 0; 766 break; 767 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 768 case 42: /* NTP server IP */ 769 NetCopyIP(&NetNtpServerIP, (popt + 2)); 770 break; 771 #endif 772 case 51: 773 NetCopyLong(&dhcp_leasetime, (ulong *) (popt + 2)); 774 break; 775 case 53: /* Ignore Message Type Option */ 776 break; 777 case 54: 778 NetCopyIP(&NetDHCPServerIP, (popt + 2)); 779 break; 780 case 58: /* Ignore Renewal Time Option */ 781 break; 782 case 59: /* Ignore Rebinding Time Option */ 783 break; 784 case 66: /* Ignore TFTP server name */ 785 break; 786 case 67: /* vendor opt bootfile */ 787 /* 788 * I can't use dhcp_vendorex_proc here because I need 789 * to write into the bootp packet - even then I had to 790 * pass the bootp packet pointer into here as the 791 * second arg 792 */ 793 size = truncate_sz("Opt Boot File", 794 sizeof(bp->bp_file), 795 oplen); 796 if (bp->bp_file[0] == '\0' && size > 0) { 797 /* 798 * only use vendor boot file if we didn't 799 * receive a boot file in the main non-vendor 800 * part of the packet - god only knows why 801 * some vendors chose not to use this perfectly 802 * good spot to store the boot file (join on 803 * Tru64 Unix) it seems mind bogglingly crazy 804 * to me 805 */ 806 printf("*** WARNING: using vendor " 807 "optional boot file\n"); 808 memcpy(bp->bp_file, popt + 2, size); 809 bp->bp_file[size] = '\0'; 810 } 811 break; 812 default: 813 #if defined(CONFIG_BOOTP_VENDOREX) 814 if (dhcp_vendorex_proc(popt)) 815 break; 816 #endif 817 printf("*** Unhandled DHCP Option in OFFER/ACK:" 818 " %d\n", *popt); 819 break; 820 } 821 popt += oplen + 2; /* Process next option */ 822 } 823 } 824 825 static int DhcpMessageType(unsigned char *popt) 826 { 827 if (NetReadLong((ulong *)popt) != htonl(BOOTP_VENDOR_MAGIC)) 828 return -1; 829 830 popt += 4; 831 while (*popt != 0xff) { 832 if (*popt == 53) /* DHCP Message Type */ 833 return *(popt + 2); 834 popt += *(popt + 1) + 2; /* Scan through all options */ 835 } 836 return -1; 837 } 838 839 static void DhcpSendRequestPkt(struct Bootp_t *bp_offer) 840 { 841 uchar *pkt, *iphdr; 842 struct Bootp_t *bp; 843 int pktlen, iplen, extlen; 844 IPaddr_t OfferedIP; 845 846 debug("DhcpSendRequestPkt: Sending DHCPREQUEST\n"); 847 pkt = NetTxPacket; 848 memset((void *)pkt, 0, PKTSIZE); 849 850 pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP); 851 852 iphdr = pkt; /* We'll need this later to set proper pkt size */ 853 pkt += IP_HDR_SIZE; 854 855 bp = (struct Bootp_t *)pkt; 856 bp->bp_op = OP_BOOTREQUEST; 857 bp->bp_htype = HWT_ETHER; 858 bp->bp_hlen = HWL_ETHER; 859 bp->bp_hops = 0; 860 bp->bp_secs = htons(get_timer(0) / 1000); 861 /* Do not set the client IP, your IP, or server IP yet, since it 862 * hasn't been ACK'ed by the server yet */ 863 864 /* 865 * RFC3046 requires Relay Agents to discard packets with 866 * nonzero and offered giaddr 867 */ 868 NetWriteIP(&bp->bp_giaddr, 0); 869 870 memcpy(bp->bp_chaddr, NetOurEther, 6); 871 872 /* 873 * ID is the id of the OFFER packet 874 */ 875 876 NetCopyLong(&bp->bp_id, &bp_offer->bp_id); 877 878 /* 879 * Copy options from OFFER packet if present 880 */ 881 882 /* Copy offered IP into the parameters request list */ 883 NetCopyIP(&OfferedIP, &bp_offer->bp_yiaddr); 884 extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_REQUEST, 885 NetDHCPServerIP, OfferedIP); 886 887 pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_SIZE - 888 sizeof(bp->bp_vend) + extlen; 889 iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen; 890 NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); 891 892 debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen); 893 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY 894 udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY); 895 #endif /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */ 896 NetSendPacket(NetTxPacket, pktlen); 897 } 898 899 /* 900 * Handle DHCP received packets. 901 */ 902 static void 903 DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 904 unsigned len) 905 { 906 struct Bootp_t *bp = (struct Bootp_t *)pkt; 907 908 debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n", 909 src, dest, len, dhcp_state); 910 911 /* Filter out pkts we don't want */ 912 if (BootpCheckPkt(pkt, dest, src, len)) 913 return; 914 915 debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state:" 916 " %d\n", src, dest, len, dhcp_state); 917 918 switch (dhcp_state) { 919 case SELECTING: 920 /* 921 * Wait an appropriate time for any potential DHCPOFFER packets 922 * to arrive. Then select one, and generate DHCPREQUEST 923 * response. If filename is in format we recognize, assume it 924 * is a valid OFFER from a server we want. 925 */ 926 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file); 927 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 928 if (strncmp(bp->bp_file, 929 CONFIG_SYS_BOOTFILE_PREFIX, 930 strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) { 931 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 932 933 debug("TRANSITIONING TO REQUESTING STATE\n"); 934 dhcp_state = REQUESTING; 935 936 if (NetReadLong((ulong *)&bp->bp_vend[0]) == 937 htonl(BOOTP_VENDOR_MAGIC)) 938 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp); 939 940 NetSetTimeout(TIMEOUT, BootpTimeout); 941 DhcpSendRequestPkt(bp); 942 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 943 } 944 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 945 946 return; 947 break; 948 case REQUESTING: 949 debug("DHCP State: REQUESTING\n"); 950 951 if (DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK) { 952 if (NetReadLong((ulong *)&bp->bp_vend[0]) == 953 htonl(BOOTP_VENDOR_MAGIC)) 954 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp); 955 /* Store net params from reply */ 956 BootpCopyNetParams(bp); 957 dhcp_state = BOUND; 958 printf("DHCP client bound to address %pI4\n", 959 &NetOurIP); 960 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, 961 "bootp_stop"); 962 963 net_auto_load(); 964 return; 965 } 966 break; 967 case BOUND: 968 /* DHCP client bound to address */ 969 break; 970 default: 971 puts("DHCP: INVALID STATE\n"); 972 break; 973 } 974 975 } 976 977 void DhcpRequest(void) 978 { 979 BootpRequest(); 980 } 981 #endif /* CONFIG_CMD_DHCP */ 982