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 "net_rand.h" 16 #include "tftp.h" 17 #include "nfs.h" 18 #ifdef CONFIG_STATUS_LED 19 #include <status_led.h> 20 #endif 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 41 #if defined(CONFIG_CMD_DHCP) 42 dhcp_state_t dhcp_state = INIT; 43 unsigned long dhcp_leasetime; 44 IPaddr_t NetDHCPServerIP; 45 static void DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 46 unsigned len); 47 48 /* For Debug */ 49 #if 0 50 static char *dhcpmsg2str(int type) 51 { 52 switch (type) { 53 case 1: return "DHCPDISCOVER"; break; 54 case 2: return "DHCPOFFER"; break; 55 case 3: return "DHCPREQUEST"; break; 56 case 4: return "DHCPDECLINE"; break; 57 case 5: return "DHCPACK"; break; 58 case 6: return "DHCPNACK"; break; 59 case 7: return "DHCPRELEASE"; break; 60 default: return "UNKNOWN/INVALID MSG TYPE"; break; 61 } 62 } 63 #endif 64 #endif 65 66 static int BootpCheckPkt(uchar *pkt, unsigned dest, unsigned src, unsigned len) 67 { 68 struct Bootp_t *bp = (struct Bootp_t *) pkt; 69 int retval = 0; 70 71 if (dest != PORT_BOOTPC || src != PORT_BOOTPS) 72 retval = -1; 73 else if (len < sizeof(struct Bootp_t) - OPT_FIELD_SIZE) 74 retval = -2; 75 else if (bp->bp_op != OP_BOOTREQUEST && 76 bp->bp_op != OP_BOOTREPLY && 77 bp->bp_op != DHCP_OFFER && 78 bp->bp_op != DHCP_ACK && 79 bp->bp_op != DHCP_NAK) 80 retval = -3; 81 else if (bp->bp_htype != HWT_ETHER) 82 retval = -4; 83 else if (bp->bp_hlen != HWL_ETHER) 84 retval = -5; 85 else if (NetReadLong((ulong *)&bp->bp_id) != BootpID) 86 retval = -6; 87 88 debug("Filtering pkt = %d\n", retval); 89 90 return retval; 91 } 92 93 /* 94 * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet 95 */ 96 static void BootpCopyNetParams(struct Bootp_t *bp) 97 { 98 #if !defined(CONFIG_BOOTP_SERVERIP) 99 IPaddr_t tmp_ip; 100 101 NetCopyIP(&tmp_ip, &bp->bp_siaddr); 102 if (tmp_ip != 0) 103 NetCopyIP(&NetServerIP, &bp->bp_siaddr); 104 memcpy(NetServerEther, ((struct ethernet_hdr *)NetRxPacket)->et_src, 6); 105 #endif 106 NetCopyIP(&NetOurIP, &bp->bp_yiaddr); 107 if (strlen(bp->bp_file) > 0) 108 copy_filename(BootFile, bp->bp_file, sizeof(BootFile)); 109 110 debug("Bootfile: %s\n", BootFile); 111 112 /* Propagate to environment: 113 * don't delete exising entry when BOOTP / DHCP reply does 114 * not contain a new value 115 */ 116 if (*BootFile) 117 setenv("bootfile", BootFile); 118 } 119 120 static int truncate_sz(const char *name, int maxlen, int curlen) 121 { 122 if (curlen >= maxlen) { 123 printf("*** WARNING: %s is too long (%d - max: %d)" 124 " - truncated\n", name, curlen, maxlen); 125 curlen = maxlen - 1; 126 } 127 return curlen; 128 } 129 130 #if !defined(CONFIG_CMD_DHCP) 131 132 static void BootpVendorFieldProcess(u8 *ext) 133 { 134 int size = *(ext + 1); 135 136 debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext, 137 *(ext + 1)); 138 139 NetBootFileSize = 0; 140 141 switch (*ext) { 142 /* Fixed length fields */ 143 case 1: /* Subnet mask */ 144 if (NetOurSubnetMask == 0) 145 NetCopyIP(&NetOurSubnetMask, (IPaddr_t *) (ext + 2)); 146 break; 147 case 2: /* Time offset - Not yet supported */ 148 break; 149 /* Variable length fields */ 150 case 3: /* Gateways list */ 151 if (NetOurGatewayIP == 0) 152 NetCopyIP(&NetOurGatewayIP, (IPaddr_t *) (ext + 2)); 153 break; 154 case 4: /* Time server - Not yet supported */ 155 break; 156 case 5: /* IEN-116 name server - Not yet supported */ 157 break; 158 case 6: 159 if (NetOurDNSIP == 0) 160 NetCopyIP(&NetOurDNSIP, (IPaddr_t *) (ext + 2)); 161 #if defined(CONFIG_BOOTP_DNS2) 162 if ((NetOurDNS2IP == 0) && (size > 4)) 163 NetCopyIP(&NetOurDNS2IP, (IPaddr_t *) (ext + 2 + 4)); 164 #endif 165 break; 166 case 7: /* Log server - Not yet supported */ 167 break; 168 case 8: /* Cookie/Quote server - Not yet supported */ 169 break; 170 case 9: /* LPR server - Not yet supported */ 171 break; 172 case 10: /* Impress server - Not yet supported */ 173 break; 174 case 11: /* RPL server - Not yet supported */ 175 break; 176 case 12: /* Host name */ 177 if (NetOurHostName[0] == 0) { 178 size = truncate_sz("Host Name", 179 sizeof(NetOurHostName), size); 180 memcpy(&NetOurHostName, ext + 2, size); 181 NetOurHostName[size] = 0; 182 } 183 break; 184 case 13: /* Boot file size */ 185 if (size == 2) 186 NetBootFileSize = ntohs(*(ushort *) (ext + 2)); 187 else if (size == 4) 188 NetBootFileSize = ntohl(*(ulong *) (ext + 2)); 189 break; 190 case 14: /* Merit dump file - Not yet supported */ 191 break; 192 case 15: /* Domain name - Not yet supported */ 193 break; 194 case 16: /* Swap server - Not yet supported */ 195 break; 196 case 17: /* Root path */ 197 if (NetOurRootPath[0] == 0) { 198 size = truncate_sz("Root Path", 199 sizeof(NetOurRootPath), size); 200 memcpy(&NetOurRootPath, ext + 2, size); 201 NetOurRootPath[size] = 0; 202 } 203 break; 204 case 18: /* Extension path - Not yet supported */ 205 /* 206 * This can be used to send the information of the 207 * vendor area in another file that the client can 208 * access via TFTP. 209 */ 210 break; 211 /* IP host layer fields */ 212 case 40: /* NIS Domain name */ 213 if (NetOurNISDomain[0] == 0) { 214 size = truncate_sz("NIS Domain Name", 215 sizeof(NetOurNISDomain), size); 216 memcpy(&NetOurNISDomain, ext + 2, size); 217 NetOurNISDomain[size] = 0; 218 } 219 break; 220 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 221 case 42: /* NTP server IP */ 222 NetCopyIP(&NetNtpServerIP, (IPaddr_t *) (ext + 2)); 223 break; 224 #endif 225 /* Application layer fields */ 226 case 43: /* Vendor specific info - Not yet supported */ 227 /* 228 * Binary information to exchange specific 229 * product information. 230 */ 231 break; 232 /* Reserved (custom) fields (128..254) */ 233 } 234 } 235 236 static void BootpVendorProcess(u8 *ext, int size) 237 { 238 u8 *end = ext + size; 239 240 debug("[BOOTP] Checking extension (%d bytes)...\n", size); 241 242 while ((ext < end) && (*ext != 0xff)) { 243 if (*ext == 0) { 244 ext++; 245 } else { 246 u8 *opt = ext; 247 248 ext += ext[1] + 2; 249 if (ext <= end) 250 BootpVendorFieldProcess(opt); 251 } 252 } 253 254 debug("[BOOTP] Received fields:\n"); 255 if (NetOurSubnetMask) 256 debug("NetOurSubnetMask : %pI4\n", &NetOurSubnetMask); 257 258 if (NetOurGatewayIP) 259 debug("NetOurGatewayIP : %pI4", &NetOurGatewayIP); 260 261 if (NetBootFileSize) 262 debug("NetBootFileSize : %d\n", NetBootFileSize); 263 264 if (NetOurHostName[0]) 265 debug("NetOurHostName : %s\n", NetOurHostName); 266 267 if (NetOurRootPath[0]) 268 debug("NetOurRootPath : %s\n", NetOurRootPath); 269 270 if (NetOurNISDomain[0]) 271 debug("NetOurNISDomain : %s\n", NetOurNISDomain); 272 273 if (NetBootFileSize) 274 debug("NetBootFileSize: %d\n", NetBootFileSize); 275 276 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 277 if (NetNtpServerIP) 278 debug("NetNtpServerIP : %pI4\n", &NetNtpServerIP); 279 #endif 280 } 281 282 /* 283 * Handle a BOOTP received packet. 284 */ 285 static void 286 BootpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 287 unsigned len) 288 { 289 struct Bootp_t *bp; 290 291 debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n", 292 src, dest, len, sizeof(struct Bootp_t)); 293 294 bp = (struct Bootp_t *)pkt; 295 296 /* Filter out pkts we don't want */ 297 if (BootpCheckPkt(pkt, dest, src, len)) 298 return; 299 300 /* 301 * Got a good BOOTP reply. Copy the data into our variables. 302 */ 303 #ifdef CONFIG_STATUS_LED 304 status_led_set(STATUS_LED_BOOT, STATUS_LED_OFF); 305 #endif 306 307 BootpCopyNetParams(bp); /* Store net parameters from reply */ 308 309 /* Retrieve extended information (we must parse the vendor area) */ 310 if (NetReadLong((ulong *)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 311 BootpVendorProcess((uchar *)&bp->bp_vend[4], len); 312 313 NetSetTimeout(0, (thand_f *)0); 314 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop"); 315 316 debug("Got good BOOTP\n"); 317 318 net_auto_load(); 319 } 320 #endif 321 322 /* 323 * Timeout on BOOTP/DHCP request. 324 */ 325 static void 326 BootpTimeout(void) 327 { 328 if (BootpTry >= TIMEOUT_COUNT) { 329 #ifdef CONFIG_BOOTP_MAY_FAIL 330 puts("\nRetry count exceeded\n"); 331 NetSetState(NETLOOP_FAIL); 332 #else 333 puts("\nRetry count exceeded; starting again\n"); 334 NetStartAgain(); 335 #endif 336 } else { 337 NetSetTimeout(TIMEOUT, BootpTimeout); 338 BootpRequest(); 339 } 340 } 341 342 /* 343 * Initialize BOOTP extension fields in the request. 344 */ 345 #if defined(CONFIG_CMD_DHCP) 346 static int DhcpExtended(u8 *e, int message_type, IPaddr_t ServerID, 347 IPaddr_t RequestedIP) 348 { 349 u8 *start = e; 350 u8 *cnt; 351 #if defined(CONFIG_BOOTP_PXE) 352 char *uuid; 353 size_t vci_strlen; 354 u16 clientarch; 355 #endif 356 357 #if defined(CONFIG_BOOTP_VENDOREX) 358 u8 *x; 359 #endif 360 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 361 char *hostname; 362 #endif 363 364 *e++ = 99; /* RFC1048 Magic Cookie */ 365 *e++ = 130; 366 *e++ = 83; 367 *e++ = 99; 368 369 *e++ = 53; /* DHCP Message Type */ 370 *e++ = 1; 371 *e++ = message_type; 372 373 *e++ = 57; /* Maximum DHCP Message Size */ 374 *e++ = 2; 375 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 8; 376 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff; 377 378 if (ServerID) { 379 int tmp = ntohl(ServerID); 380 381 *e++ = 54; /* ServerID */ 382 *e++ = 4; 383 *e++ = tmp >> 24; 384 *e++ = tmp >> 16; 385 *e++ = tmp >> 8; 386 *e++ = tmp & 0xff; 387 } 388 389 if (RequestedIP) { 390 int tmp = ntohl(RequestedIP); 391 392 *e++ = 50; /* Requested IP */ 393 *e++ = 4; 394 *e++ = tmp >> 24; 395 *e++ = tmp >> 16; 396 *e++ = tmp >> 8; 397 *e++ = tmp & 0xff; 398 } 399 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 400 hostname = getenv("hostname"); 401 if (hostname) { 402 int hostnamelen = strlen(hostname); 403 404 *e++ = 12; /* Hostname */ 405 *e++ = hostnamelen; 406 memcpy(e, hostname, hostnamelen); 407 e += hostnamelen; 408 } 409 #endif 410 411 #if defined(CONFIG_BOOTP_PXE) 412 clientarch = CONFIG_BOOTP_PXE_CLIENTARCH; 413 *e++ = 93; /* Client System Architecture */ 414 *e++ = 2; 415 *e++ = (clientarch >> 8) & 0xff; 416 *e++ = clientarch & 0xff; 417 418 *e++ = 94; /* Client Network Interface Identifier */ 419 *e++ = 3; 420 *e++ = 1; /* type field for UNDI */ 421 *e++ = 0; /* major revision */ 422 *e++ = 0; /* minor revision */ 423 424 uuid = getenv("pxeuuid"); 425 426 if (uuid) { 427 if (uuid_str_valid(uuid)) { 428 *e++ = 97; /* Client Machine Identifier */ 429 *e++ = 17; 430 *e++ = 0; /* type 0 - UUID */ 431 432 uuid_str_to_bin(uuid, e); 433 e += 16; 434 } else { 435 printf("Invalid pxeuuid: %s\n", uuid); 436 } 437 } 438 439 *e++ = 60; /* Vendor Class Identifier */ 440 vci_strlen = strlen(CONFIG_BOOTP_VCI_STRING); 441 *e++ = vci_strlen; 442 memcpy(e, CONFIG_BOOTP_VCI_STRING, vci_strlen); 443 e += vci_strlen; 444 #endif 445 446 #if defined(CONFIG_BOOTP_VENDOREX) 447 x = dhcp_vendorex_prep(e); 448 if (x) 449 return x - start; 450 #endif 451 452 *e++ = 55; /* Parameter Request List */ 453 cnt = e++; /* Pointer to count of requested items */ 454 *cnt = 0; 455 #if defined(CONFIG_BOOTP_SUBNETMASK) 456 *e++ = 1; /* Subnet Mask */ 457 *cnt += 1; 458 #endif 459 #if defined(CONFIG_BOOTP_TIMEOFFSET) 460 *e++ = 2; 461 *cnt += 1; 462 #endif 463 #if defined(CONFIG_BOOTP_GATEWAY) 464 *e++ = 3; /* Router Option */ 465 *cnt += 1; 466 #endif 467 #if defined(CONFIG_BOOTP_DNS) 468 *e++ = 6; /* DNS Server(s) */ 469 *cnt += 1; 470 #endif 471 #if defined(CONFIG_BOOTP_HOSTNAME) 472 *e++ = 12; /* Hostname */ 473 *cnt += 1; 474 #endif 475 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 476 *e++ = 13; /* Boot File Size */ 477 *cnt += 1; 478 #endif 479 #if defined(CONFIG_BOOTP_BOOTPATH) 480 *e++ = 17; /* Boot path */ 481 *cnt += 1; 482 #endif 483 #if defined(CONFIG_BOOTP_NISDOMAIN) 484 *e++ = 40; /* NIS Domain name request */ 485 *cnt += 1; 486 #endif 487 #if defined(CONFIG_BOOTP_NTPSERVER) 488 *e++ = 42; 489 *cnt += 1; 490 #endif 491 /* no options, so back up to avoid sending an empty request list */ 492 if (*cnt == 0) 493 e -= 2; 494 495 *e++ = 255; /* End of the list */ 496 497 /* Pad to minimal length */ 498 #ifdef CONFIG_DHCP_MIN_EXT_LEN 499 while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN) 500 *e++ = 0; 501 #endif 502 503 return e - start; 504 } 505 506 #else 507 /* 508 * Warning: no field size check - change CONFIG_BOOTP_* at your own risk! 509 */ 510 static int BootpExtended(u8 *e) 511 { 512 u8 *start = e; 513 514 *e++ = 99; /* RFC1048 Magic Cookie */ 515 *e++ = 130; 516 *e++ = 83; 517 *e++ = 99; 518 519 #if defined(CONFIG_CMD_DHCP) 520 *e++ = 53; /* DHCP Message Type */ 521 *e++ = 1; 522 *e++ = DHCP_DISCOVER; 523 524 *e++ = 57; /* Maximum DHCP Message Size */ 525 *e++ = 2; 526 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 16; 527 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff; 528 #endif 529 530 #if defined(CONFIG_BOOTP_SUBNETMASK) 531 *e++ = 1; /* Subnet mask request */ 532 *e++ = 4; 533 e += 4; 534 #endif 535 536 #if defined(CONFIG_BOOTP_GATEWAY) 537 *e++ = 3; /* Default gateway request */ 538 *e++ = 4; 539 e += 4; 540 #endif 541 542 #if defined(CONFIG_BOOTP_DNS) 543 *e++ = 6; /* Domain Name Server */ 544 *e++ = 4; 545 e += 4; 546 #endif 547 548 #if defined(CONFIG_BOOTP_HOSTNAME) 549 *e++ = 12; /* Host name request */ 550 *e++ = 32; 551 e += 32; 552 #endif 553 554 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 555 *e++ = 13; /* Boot file size */ 556 *e++ = 2; 557 e += 2; 558 #endif 559 560 #if defined(CONFIG_BOOTP_BOOTPATH) 561 *e++ = 17; /* Boot path */ 562 *e++ = 32; 563 e += 32; 564 #endif 565 566 #if defined(CONFIG_BOOTP_NISDOMAIN) 567 *e++ = 40; /* NIS Domain name request */ 568 *e++ = 32; 569 e += 32; 570 #endif 571 #if defined(CONFIG_BOOTP_NTPSERVER) 572 *e++ = 42; 573 *e++ = 4; 574 e += 4; 575 #endif 576 577 *e++ = 255; /* End of the list */ 578 579 return e - start; 580 } 581 #endif 582 583 void 584 BootpRequest(void) 585 { 586 uchar *pkt, *iphdr; 587 struct Bootp_t *bp; 588 int extlen, pktlen, iplen; 589 int eth_hdr_size; 590 #ifdef CONFIG_BOOTP_RANDOM_DELAY 591 ulong i, rand_ms; 592 #endif 593 594 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start"); 595 #if defined(CONFIG_CMD_DHCP) 596 dhcp_state = INIT; 597 #endif 598 599 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */ 600 if (BootpTry == 0) 601 srand_mac(); 602 603 if (BootpTry <= 2) /* Start with max 1024 * 1ms */ 604 rand_ms = rand() >> (22 - BootpTry); 605 else /* After 3rd BOOTP request max 8192 * 1ms */ 606 rand_ms = rand() >> 19; 607 608 printf("Random delay: %ld ms...\n", rand_ms); 609 for (i = 0; i < rand_ms; i++) 610 udelay(1000); /*Wait 1ms*/ 611 612 #endif /* CONFIG_BOOTP_RANDOM_DELAY */ 613 614 printf("BOOTP broadcast %d\n", ++BootpTry); 615 pkt = NetTxPacket; 616 memset((void *)pkt, 0, PKTSIZE); 617 618 eth_hdr_size = NetSetEther(pkt, NetBcastAddr, PROT_IP); 619 pkt += eth_hdr_size; 620 621 /* 622 * Next line results in incorrect packet size being transmitted, 623 * resulting in errors in some DHCP servers, reporting missing bytes. 624 * Size must be set in packet header after extension length has been 625 * determined. 626 * C. Hallinan, DS4.COM, Inc. 627 */ 628 /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, 629 sizeof (struct Bootp_t)); */ 630 iphdr = pkt; /* We need this later for net_set_udp_header() */ 631 pkt += IP_UDP_HDR_SIZE; 632 633 bp = (struct Bootp_t *)pkt; 634 bp->bp_op = OP_BOOTREQUEST; 635 bp->bp_htype = HWT_ETHER; 636 bp->bp_hlen = HWL_ETHER; 637 bp->bp_hops = 0; 638 bp->bp_secs = htons(get_timer(0) / 1000); 639 NetWriteIP(&bp->bp_ciaddr, 0); 640 NetWriteIP(&bp->bp_yiaddr, 0); 641 NetWriteIP(&bp->bp_siaddr, 0); 642 NetWriteIP(&bp->bp_giaddr, 0); 643 memcpy(bp->bp_chaddr, NetOurEther, 6); 644 copy_filename(bp->bp_file, BootFile, sizeof(bp->bp_file)); 645 646 /* Request additional information from the BOOTP/DHCP server */ 647 #if defined(CONFIG_CMD_DHCP) 648 extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0); 649 #else 650 extlen = BootpExtended((u8 *)bp->bp_vend); 651 #endif 652 653 /* 654 * Bootp ID is the lower 4 bytes of our ethernet address 655 * plus the current time in ms. 656 */ 657 BootpID = ((ulong)NetOurEther[2] << 24) 658 | ((ulong)NetOurEther[3] << 16) 659 | ((ulong)NetOurEther[4] << 8) 660 | (ulong)NetOurEther[5]; 661 BootpID += get_timer(0); 662 BootpID = htonl(BootpID); 663 NetCopyLong(&bp->bp_id, &BootpID); 664 665 /* 666 * Calculate proper packet lengths taking into account the 667 * variable size of the options field 668 */ 669 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen; 670 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen; 671 net_set_udp_header(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); 672 NetSetTimeout(SELECT_TIMEOUT, BootpTimeout); 673 674 #if defined(CONFIG_CMD_DHCP) 675 dhcp_state = SELECTING; 676 net_set_udp_handler(DhcpHandler); 677 #else 678 net_set_udp_handler(BootpHandler); 679 #endif 680 NetSendPacket(NetTxPacket, pktlen); 681 } 682 683 #if defined(CONFIG_CMD_DHCP) 684 static void DhcpOptionsProcess(uchar *popt, struct Bootp_t *bp) 685 { 686 uchar *end = popt + BOOTP_HDR_SIZE; 687 int oplen, size; 688 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 689 int *to_ptr; 690 #endif 691 692 while (popt < end && *popt != 0xff) { 693 oplen = *(popt + 1); 694 switch (*popt) { 695 case 1: 696 NetCopyIP(&NetOurSubnetMask, (popt + 2)); 697 break; 698 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 699 case 2: /* Time offset */ 700 to_ptr = &NetTimeOffset; 701 NetCopyLong((ulong *)to_ptr, (ulong *)(popt + 2)); 702 NetTimeOffset = ntohl(NetTimeOffset); 703 break; 704 #endif 705 case 3: 706 NetCopyIP(&NetOurGatewayIP, (popt + 2)); 707 break; 708 case 6: 709 NetCopyIP(&NetOurDNSIP, (popt + 2)); 710 #if defined(CONFIG_BOOTP_DNS2) 711 if (*(popt + 1) > 4) 712 NetCopyIP(&NetOurDNS2IP, (popt + 2 + 4)); 713 #endif 714 break; 715 case 12: 716 size = truncate_sz("Host Name", 717 sizeof(NetOurHostName), oplen); 718 memcpy(&NetOurHostName, popt + 2, size); 719 NetOurHostName[size] = 0; 720 break; 721 case 15: /* Ignore Domain Name Option */ 722 break; 723 case 17: 724 size = truncate_sz("Root Path", 725 sizeof(NetOurRootPath), oplen); 726 memcpy(&NetOurRootPath, popt + 2, size); 727 NetOurRootPath[size] = 0; 728 break; 729 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 730 case 42: /* NTP server IP */ 731 NetCopyIP(&NetNtpServerIP, (popt + 2)); 732 break; 733 #endif 734 case 51: 735 NetCopyLong(&dhcp_leasetime, (ulong *) (popt + 2)); 736 break; 737 case 53: /* Ignore Message Type Option */ 738 break; 739 case 54: 740 NetCopyIP(&NetDHCPServerIP, (popt + 2)); 741 break; 742 case 58: /* Ignore Renewal Time Option */ 743 break; 744 case 59: /* Ignore Rebinding Time Option */ 745 break; 746 case 66: /* Ignore TFTP server name */ 747 break; 748 case 67: /* vendor opt bootfile */ 749 /* 750 * I can't use dhcp_vendorex_proc here because I need 751 * to write into the bootp packet - even then I had to 752 * pass the bootp packet pointer into here as the 753 * second arg 754 */ 755 size = truncate_sz("Opt Boot File", 756 sizeof(bp->bp_file), 757 oplen); 758 if (bp->bp_file[0] == '\0' && size > 0) { 759 /* 760 * only use vendor boot file if we didn't 761 * receive a boot file in the main non-vendor 762 * part of the packet - god only knows why 763 * some vendors chose not to use this perfectly 764 * good spot to store the boot file (join on 765 * Tru64 Unix) it seems mind bogglingly crazy 766 * to me 767 */ 768 printf("*** WARNING: using vendor " 769 "optional boot file\n"); 770 memcpy(bp->bp_file, popt + 2, size); 771 bp->bp_file[size] = '\0'; 772 } 773 break; 774 default: 775 #if defined(CONFIG_BOOTP_VENDOREX) 776 if (dhcp_vendorex_proc(popt)) 777 break; 778 #endif 779 printf("*** Unhandled DHCP Option in OFFER/ACK:" 780 " %d\n", *popt); 781 break; 782 } 783 popt += oplen + 2; /* Process next option */ 784 } 785 } 786 787 static int DhcpMessageType(unsigned char *popt) 788 { 789 if (NetReadLong((ulong *)popt) != htonl(BOOTP_VENDOR_MAGIC)) 790 return -1; 791 792 popt += 4; 793 while (*popt != 0xff) { 794 if (*popt == 53) /* DHCP Message Type */ 795 return *(popt + 2); 796 popt += *(popt + 1) + 2; /* Scan through all options */ 797 } 798 return -1; 799 } 800 801 static void DhcpSendRequestPkt(struct Bootp_t *bp_offer) 802 { 803 uchar *pkt, *iphdr; 804 struct Bootp_t *bp; 805 int pktlen, iplen, extlen; 806 int eth_hdr_size; 807 IPaddr_t OfferedIP; 808 809 debug("DhcpSendRequestPkt: Sending DHCPREQUEST\n"); 810 pkt = NetTxPacket; 811 memset((void *)pkt, 0, PKTSIZE); 812 813 eth_hdr_size = NetSetEther(pkt, NetBcastAddr, PROT_IP); 814 pkt += eth_hdr_size; 815 816 iphdr = pkt; /* We'll need this later to set proper pkt size */ 817 pkt += IP_UDP_HDR_SIZE; 818 819 bp = (struct Bootp_t *)pkt; 820 bp->bp_op = OP_BOOTREQUEST; 821 bp->bp_htype = HWT_ETHER; 822 bp->bp_hlen = HWL_ETHER; 823 bp->bp_hops = 0; 824 bp->bp_secs = htons(get_timer(0) / 1000); 825 /* Do not set the client IP, your IP, or server IP yet, since it 826 * hasn't been ACK'ed by the server yet */ 827 828 /* 829 * RFC3046 requires Relay Agents to discard packets with 830 * nonzero and offered giaddr 831 */ 832 NetWriteIP(&bp->bp_giaddr, 0); 833 834 memcpy(bp->bp_chaddr, NetOurEther, 6); 835 836 /* 837 * ID is the id of the OFFER packet 838 */ 839 840 NetCopyLong(&bp->bp_id, &bp_offer->bp_id); 841 842 /* 843 * Copy options from OFFER packet if present 844 */ 845 846 /* Copy offered IP into the parameters request list */ 847 NetCopyIP(&OfferedIP, &bp_offer->bp_yiaddr); 848 extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_REQUEST, 849 NetDHCPServerIP, OfferedIP); 850 851 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen; 852 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen; 853 net_set_udp_header(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); 854 855 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY 856 udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY); 857 #endif /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */ 858 debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen); 859 NetSendPacket(NetTxPacket, pktlen); 860 } 861 862 /* 863 * Handle DHCP received packets. 864 */ 865 static void 866 DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 867 unsigned len) 868 { 869 struct Bootp_t *bp = (struct Bootp_t *)pkt; 870 871 debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n", 872 src, dest, len, dhcp_state); 873 874 /* Filter out pkts we don't want */ 875 if (BootpCheckPkt(pkt, dest, src, len)) 876 return; 877 878 debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state:" 879 " %d\n", src, dest, len, dhcp_state); 880 881 switch (dhcp_state) { 882 case SELECTING: 883 /* 884 * Wait an appropriate time for any potential DHCPOFFER packets 885 * to arrive. Then select one, and generate DHCPREQUEST 886 * response. If filename is in format we recognize, assume it 887 * is a valid OFFER from a server we want. 888 */ 889 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file); 890 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 891 if (strncmp(bp->bp_file, 892 CONFIG_SYS_BOOTFILE_PREFIX, 893 strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) { 894 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 895 896 debug("TRANSITIONING TO REQUESTING STATE\n"); 897 dhcp_state = REQUESTING; 898 899 if (NetReadLong((ulong *)&bp->bp_vend[0]) == 900 htonl(BOOTP_VENDOR_MAGIC)) 901 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp); 902 903 NetSetTimeout(TIMEOUT, BootpTimeout); 904 DhcpSendRequestPkt(bp); 905 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 906 } 907 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 908 909 return; 910 break; 911 case REQUESTING: 912 debug("DHCP State: REQUESTING\n"); 913 914 if (DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK) { 915 if (NetReadLong((ulong *)&bp->bp_vend[0]) == 916 htonl(BOOTP_VENDOR_MAGIC)) 917 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp); 918 /* Store net params from reply */ 919 BootpCopyNetParams(bp); 920 dhcp_state = BOUND; 921 printf("DHCP client bound to address %pI4\n", 922 &NetOurIP); 923 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, 924 "bootp_stop"); 925 926 net_auto_load(); 927 return; 928 } 929 break; 930 case BOUND: 931 /* DHCP client bound to address */ 932 break; 933 default: 934 puts("DHCP: INVALID STATE\n"); 935 break; 936 } 937 938 } 939 940 void DhcpRequest(void) 941 { 942 BootpRequest(); 943 } 944 #endif /* CONFIG_CMD_DHCP */ 945