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 #ifdef CONFIG_BOOTP_RANDOM_DELAY 21 #include "net_rand.h" 22 #endif 23 24 #define BOOTP_VENDOR_MAGIC 0x63825363 /* RFC1048 Magic Cookie */ 25 26 #define TIMEOUT 5000UL /* Milliseconds before trying BOOTP again */ 27 #ifndef CONFIG_NET_RETRY_COUNT 28 # define TIMEOUT_COUNT 5 /* # of timeouts before giving up */ 29 #else 30 # define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT) 31 #endif 32 33 #define PORT_BOOTPS 67 /* BOOTP server UDP port */ 34 #define PORT_BOOTPC 68 /* BOOTP client UDP port */ 35 36 #ifndef CONFIG_DHCP_MIN_EXT_LEN /* minimal length of extension list */ 37 #define CONFIG_DHCP_MIN_EXT_LEN 64 38 #endif 39 40 ulong BootpID; 41 int BootpTry; 42 43 #if defined(CONFIG_CMD_DHCP) 44 dhcp_state_t dhcp_state = INIT; 45 unsigned long dhcp_leasetime; 46 IPaddr_t NetDHCPServerIP; 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 #endif 67 68 static int BootpCheckPkt(uchar *pkt, unsigned dest, unsigned src, unsigned len) 69 { 70 struct Bootp_t *bp = (struct Bootp_t *) pkt; 71 int retval = 0; 72 73 if (dest != PORT_BOOTPC || src != PORT_BOOTPS) 74 retval = -1; 75 else if (len < sizeof(struct Bootp_t) - OPT_FIELD_SIZE) 76 retval = -2; 77 else if (bp->bp_op != OP_BOOTREQUEST && 78 bp->bp_op != OP_BOOTREPLY && 79 bp->bp_op != DHCP_OFFER && 80 bp->bp_op != DHCP_ACK && 81 bp->bp_op != DHCP_NAK) 82 retval = -3; 83 else if (bp->bp_htype != HWT_ETHER) 84 retval = -4; 85 else if (bp->bp_hlen != HWL_ETHER) 86 retval = -5; 87 else if (NetReadLong((ulong *)&bp->bp_id) != BootpID) 88 retval = -6; 89 90 debug("Filtering pkt = %d\n", retval); 91 92 return retval; 93 } 94 95 /* 96 * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet 97 */ 98 static void BootpCopyNetParams(struct Bootp_t *bp) 99 { 100 #if !defined(CONFIG_BOOTP_SERVERIP) 101 IPaddr_t tmp_ip; 102 103 NetCopyIP(&tmp_ip, &bp->bp_siaddr); 104 if (tmp_ip != 0) 105 NetCopyIP(&NetServerIP, &bp->bp_siaddr); 106 memcpy(NetServerEther, ((struct ethernet_hdr *)NetRxPacket)->et_src, 6); 107 #endif 108 NetCopyIP(&NetOurIP, &bp->bp_yiaddr); 109 if (strlen(bp->bp_file) > 0) 110 copy_filename(BootFile, bp->bp_file, sizeof(BootFile)); 111 112 debug("Bootfile: %s\n", BootFile); 113 114 /* Propagate to environment: 115 * don't delete exising entry when BOOTP / DHCP reply does 116 * not contain a new value 117 */ 118 if (*BootFile) 119 setenv("bootfile", BootFile); 120 } 121 122 static int truncate_sz(const char *name, int maxlen, int curlen) 123 { 124 if (curlen >= maxlen) { 125 printf("*** WARNING: %s is too long (%d - max: %d)" 126 " - truncated\n", name, curlen, maxlen); 127 curlen = maxlen - 1; 128 } 129 return curlen; 130 } 131 132 #if !defined(CONFIG_CMD_DHCP) 133 134 static void BootpVendorFieldProcess(u8 *ext) 135 { 136 int size = *(ext + 1); 137 138 debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext, 139 *(ext + 1)); 140 141 NetBootFileSize = 0; 142 143 switch (*ext) { 144 /* Fixed length fields */ 145 case 1: /* Subnet mask */ 146 if (NetOurSubnetMask == 0) 147 NetCopyIP(&NetOurSubnetMask, (IPaddr_t *) (ext + 2)); 148 break; 149 case 2: /* Time offset - Not yet supported */ 150 break; 151 /* Variable length fields */ 152 case 3: /* Gateways list */ 153 if (NetOurGatewayIP == 0) 154 NetCopyIP(&NetOurGatewayIP, (IPaddr_t *) (ext + 2)); 155 break; 156 case 4: /* Time server - Not yet supported */ 157 break; 158 case 5: /* IEN-116 name server - Not yet supported */ 159 break; 160 case 6: 161 if (NetOurDNSIP == 0) 162 NetCopyIP(&NetOurDNSIP, (IPaddr_t *) (ext + 2)); 163 #if defined(CONFIG_BOOTP_DNS2) 164 if ((NetOurDNS2IP == 0) && (size > 4)) 165 NetCopyIP(&NetOurDNS2IP, (IPaddr_t *) (ext + 2 + 4)); 166 #endif 167 break; 168 case 7: /* Log server - Not yet supported */ 169 break; 170 case 8: /* Cookie/Quote server - Not yet supported */ 171 break; 172 case 9: /* LPR server - Not yet supported */ 173 break; 174 case 10: /* Impress server - Not yet supported */ 175 break; 176 case 11: /* RPL server - Not yet supported */ 177 break; 178 case 12: /* Host name */ 179 if (NetOurHostName[0] == 0) { 180 size = truncate_sz("Host Name", 181 sizeof(NetOurHostName), size); 182 memcpy(&NetOurHostName, ext + 2, size); 183 NetOurHostName[size] = 0; 184 } 185 break; 186 case 13: /* Boot file size */ 187 if (size == 2) 188 NetBootFileSize = ntohs(*(ushort *) (ext + 2)); 189 else if (size == 4) 190 NetBootFileSize = ntohl(*(ulong *) (ext + 2)); 191 break; 192 case 14: /* Merit dump file - Not yet supported */ 193 break; 194 case 15: /* Domain name - Not yet supported */ 195 break; 196 case 16: /* Swap server - Not yet supported */ 197 break; 198 case 17: /* Root path */ 199 if (NetOurRootPath[0] == 0) { 200 size = truncate_sz("Root Path", 201 sizeof(NetOurRootPath), size); 202 memcpy(&NetOurRootPath, ext + 2, size); 203 NetOurRootPath[size] = 0; 204 } 205 break; 206 case 18: /* Extension path - Not yet supported */ 207 /* 208 * This can be used to send the information of the 209 * vendor area in another file that the client can 210 * access via TFTP. 211 */ 212 break; 213 /* IP host layer fields */ 214 case 40: /* NIS Domain name */ 215 if (NetOurNISDomain[0] == 0) { 216 size = truncate_sz("NIS Domain Name", 217 sizeof(NetOurNISDomain), size); 218 memcpy(&NetOurNISDomain, ext + 2, size); 219 NetOurNISDomain[size] = 0; 220 } 221 break; 222 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 223 case 42: /* NTP server IP */ 224 NetCopyIP(&NetNtpServerIP, (IPaddr_t *) (ext + 2)); 225 break; 226 #endif 227 /* Application layer fields */ 228 case 43: /* Vendor specific info - Not yet supported */ 229 /* 230 * Binary information to exchange specific 231 * product information. 232 */ 233 break; 234 /* Reserved (custom) fields (128..254) */ 235 } 236 } 237 238 static void BootpVendorProcess(u8 *ext, int size) 239 { 240 u8 *end = ext + size; 241 242 debug("[BOOTP] Checking extension (%d bytes)...\n", size); 243 244 while ((ext < end) && (*ext != 0xff)) { 245 if (*ext == 0) { 246 ext++; 247 } else { 248 u8 *opt = ext; 249 250 ext += ext[1] + 2; 251 if (ext <= end) 252 BootpVendorFieldProcess(opt); 253 } 254 } 255 256 debug("[BOOTP] Received fields:\n"); 257 if (NetOurSubnetMask) 258 debug("NetOurSubnetMask : %pI4\n", &NetOurSubnetMask); 259 260 if (NetOurGatewayIP) 261 debug("NetOurGatewayIP : %pI4", &NetOurGatewayIP); 262 263 if (NetBootFileSize) 264 debug("NetBootFileSize : %d\n", NetBootFileSize); 265 266 if (NetOurHostName[0]) 267 debug("NetOurHostName : %s\n", NetOurHostName); 268 269 if (NetOurRootPath[0]) 270 debug("NetOurRootPath : %s\n", NetOurRootPath); 271 272 if (NetOurNISDomain[0]) 273 debug("NetOurNISDomain : %s\n", NetOurNISDomain); 274 275 if (NetBootFileSize) 276 debug("NetBootFileSize: %d\n", NetBootFileSize); 277 278 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 279 if (NetNtpServerIP) 280 debug("NetNtpServerIP : %pI4\n", &NetNtpServerIP); 281 #endif 282 } 283 284 /* 285 * Handle a BOOTP received packet. 286 */ 287 static void 288 BootpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 289 unsigned len) 290 { 291 struct Bootp_t *bp; 292 293 debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n", 294 src, dest, len, sizeof(struct Bootp_t)); 295 296 bp = (struct Bootp_t *)pkt; 297 298 /* Filter out pkts we don't want */ 299 if (BootpCheckPkt(pkt, dest, src, len)) 300 return; 301 302 /* 303 * Got a good BOOTP reply. Copy the data into our variables. 304 */ 305 #ifdef CONFIG_STATUS_LED 306 status_led_set(STATUS_LED_BOOT, STATUS_LED_OFF); 307 #endif 308 309 BootpCopyNetParams(bp); /* Store net parameters from reply */ 310 311 /* Retrieve extended information (we must parse the vendor area) */ 312 if (NetReadLong((ulong *)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 313 BootpVendorProcess((uchar *)&bp->bp_vend[4], len); 314 315 NetSetTimeout(0, (thand_f *)0); 316 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop"); 317 318 debug("Got good BOOTP\n"); 319 320 net_auto_load(); 321 } 322 #endif 323 324 /* 325 * Timeout on BOOTP/DHCP request. 326 */ 327 static void 328 BootpTimeout(void) 329 { 330 if (BootpTry >= TIMEOUT_COUNT) { 331 #ifdef CONFIG_BOOTP_MAY_FAIL 332 puts("\nRetry count exceeded\n"); 333 NetSetState(NETLOOP_FAIL); 334 #else 335 puts("\nRetry count exceeded; starting again\n"); 336 NetStartAgain(); 337 #endif 338 } else { 339 NetSetTimeout(TIMEOUT, BootpTimeout); 340 BootpRequest(); 341 } 342 } 343 344 /* 345 * Initialize BOOTP extension fields in the request. 346 */ 347 #if defined(CONFIG_CMD_DHCP) 348 static int DhcpExtended(u8 *e, int message_type, IPaddr_t ServerID, 349 IPaddr_t RequestedIP) 350 { 351 u8 *start = e; 352 u8 *cnt; 353 #if defined(CONFIG_BOOTP_PXE) 354 char *uuid; 355 size_t vci_strlen; 356 u16 clientarch; 357 #endif 358 359 #if defined(CONFIG_BOOTP_VENDOREX) 360 u8 *x; 361 #endif 362 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 363 char *hostname; 364 #endif 365 366 *e++ = 99; /* RFC1048 Magic Cookie */ 367 *e++ = 130; 368 *e++ = 83; 369 *e++ = 99; 370 371 *e++ = 53; /* DHCP Message Type */ 372 *e++ = 1; 373 *e++ = message_type; 374 375 *e++ = 57; /* Maximum DHCP Message Size */ 376 *e++ = 2; 377 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 8; 378 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff; 379 380 if (ServerID) { 381 int tmp = ntohl(ServerID); 382 383 *e++ = 54; /* ServerID */ 384 *e++ = 4; 385 *e++ = tmp >> 24; 386 *e++ = tmp >> 16; 387 *e++ = tmp >> 8; 388 *e++ = tmp & 0xff; 389 } 390 391 if (RequestedIP) { 392 int tmp = ntohl(RequestedIP); 393 394 *e++ = 50; /* Requested IP */ 395 *e++ = 4; 396 *e++ = tmp >> 24; 397 *e++ = tmp >> 16; 398 *e++ = tmp >> 8; 399 *e++ = tmp & 0xff; 400 } 401 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 402 hostname = getenv("hostname"); 403 if (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 x = dhcp_vendorex_prep(e); 450 if (x) 451 return x - start; 452 #endif 453 454 *e++ = 55; /* Parameter Request List */ 455 cnt = e++; /* Pointer to count of requested items */ 456 *cnt = 0; 457 #if defined(CONFIG_BOOTP_SUBNETMASK) 458 *e++ = 1; /* Subnet Mask */ 459 *cnt += 1; 460 #endif 461 #if defined(CONFIG_BOOTP_TIMEOFFSET) 462 *e++ = 2; 463 *cnt += 1; 464 #endif 465 #if defined(CONFIG_BOOTP_GATEWAY) 466 *e++ = 3; /* Router Option */ 467 *cnt += 1; 468 #endif 469 #if defined(CONFIG_BOOTP_DNS) 470 *e++ = 6; /* DNS Server(s) */ 471 *cnt += 1; 472 #endif 473 #if defined(CONFIG_BOOTP_HOSTNAME) 474 *e++ = 12; /* Hostname */ 475 *cnt += 1; 476 #endif 477 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 478 *e++ = 13; /* Boot File Size */ 479 *cnt += 1; 480 #endif 481 #if defined(CONFIG_BOOTP_BOOTPATH) 482 *e++ = 17; /* Boot path */ 483 *cnt += 1; 484 #endif 485 #if defined(CONFIG_BOOTP_NISDOMAIN) 486 *e++ = 40; /* NIS Domain name request */ 487 *cnt += 1; 488 #endif 489 #if defined(CONFIG_BOOTP_NTPSERVER) 490 *e++ = 42; 491 *cnt += 1; 492 #endif 493 /* no options, so back up to avoid sending an empty request list */ 494 if (*cnt == 0) 495 e -= 2; 496 497 *e++ = 255; /* End of the list */ 498 499 /* Pad to minimal length */ 500 #ifdef CONFIG_DHCP_MIN_EXT_LEN 501 while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN) 502 *e++ = 0; 503 #endif 504 505 return e - start; 506 } 507 508 #else 509 /* 510 * Warning: no field size check - change CONFIG_BOOTP_* at your own risk! 511 */ 512 static int BootpExtended(u8 *e) 513 { 514 u8 *start = e; 515 516 *e++ = 99; /* RFC1048 Magic Cookie */ 517 *e++ = 130; 518 *e++ = 83; 519 *e++ = 99; 520 521 #if defined(CONFIG_CMD_DHCP) 522 *e++ = 53; /* DHCP Message Type */ 523 *e++ = 1; 524 *e++ = DHCP_DISCOVER; 525 526 *e++ = 57; /* Maximum DHCP Message Size */ 527 *e++ = 2; 528 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 16; 529 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff; 530 #endif 531 532 #if defined(CONFIG_BOOTP_SUBNETMASK) 533 *e++ = 1; /* Subnet mask request */ 534 *e++ = 4; 535 e += 4; 536 #endif 537 538 #if defined(CONFIG_BOOTP_GATEWAY) 539 *e++ = 3; /* Default gateway request */ 540 *e++ = 4; 541 e += 4; 542 #endif 543 544 #if defined(CONFIG_BOOTP_DNS) 545 *e++ = 6; /* Domain Name Server */ 546 *e++ = 4; 547 e += 4; 548 #endif 549 550 #if defined(CONFIG_BOOTP_HOSTNAME) 551 *e++ = 12; /* Host name request */ 552 *e++ = 32; 553 e += 32; 554 #endif 555 556 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 557 *e++ = 13; /* Boot file size */ 558 *e++ = 2; 559 e += 2; 560 #endif 561 562 #if defined(CONFIG_BOOTP_BOOTPATH) 563 *e++ = 17; /* Boot path */ 564 *e++ = 32; 565 e += 32; 566 #endif 567 568 #if defined(CONFIG_BOOTP_NISDOMAIN) 569 *e++ = 40; /* NIS Domain name request */ 570 *e++ = 32; 571 e += 32; 572 #endif 573 #if defined(CONFIG_BOOTP_NTPSERVER) 574 *e++ = 42; 575 *e++ = 4; 576 e += 4; 577 #endif 578 579 *e++ = 255; /* End of the list */ 580 581 return e - start; 582 } 583 #endif 584 585 void 586 BootpRequest(void) 587 { 588 uchar *pkt, *iphdr; 589 struct Bootp_t *bp; 590 int extlen, pktlen, iplen; 591 int eth_hdr_size; 592 #ifdef CONFIG_BOOTP_RANDOM_DELAY 593 ulong i, rand_ms; 594 #endif 595 596 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start"); 597 #if defined(CONFIG_CMD_DHCP) 598 dhcp_state = INIT; 599 #endif 600 601 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */ 602 if (BootpTry == 0) 603 srand_mac(); 604 605 if (BootpTry <= 2) /* Start with max 1024 * 1ms */ 606 rand_ms = rand() >> (22 - BootpTry); 607 else /* After 3rd BOOTP request max 8192 * 1ms */ 608 rand_ms = rand() >> 19; 609 610 printf("Random delay: %ld ms...\n", rand_ms); 611 for (i = 0; i < rand_ms; i++) 612 udelay(1000); /*Wait 1ms*/ 613 614 #endif /* CONFIG_BOOTP_RANDOM_DELAY */ 615 616 printf("BOOTP broadcast %d\n", ++BootpTry); 617 pkt = NetTxPacket; 618 memset((void *)pkt, 0, PKTSIZE); 619 620 eth_hdr_size = NetSetEther(pkt, NetBcastAddr, PROT_IP); 621 pkt += eth_hdr_size; 622 623 /* 624 * Next line results in incorrect packet size being transmitted, 625 * resulting in errors in some DHCP servers, reporting missing bytes. 626 * Size must be set in packet header after extension length has been 627 * determined. 628 * C. Hallinan, DS4.COM, Inc. 629 */ 630 /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, 631 sizeof (struct Bootp_t)); */ 632 iphdr = pkt; /* We need this later for net_set_udp_header() */ 633 pkt += IP_UDP_HDR_SIZE; 634 635 bp = (struct Bootp_t *)pkt; 636 bp->bp_op = OP_BOOTREQUEST; 637 bp->bp_htype = HWT_ETHER; 638 bp->bp_hlen = HWL_ETHER; 639 bp->bp_hops = 0; 640 bp->bp_secs = htons(get_timer(0) / 1000); 641 NetWriteIP(&bp->bp_ciaddr, 0); 642 NetWriteIP(&bp->bp_yiaddr, 0); 643 NetWriteIP(&bp->bp_siaddr, 0); 644 NetWriteIP(&bp->bp_giaddr, 0); 645 memcpy(bp->bp_chaddr, NetOurEther, 6); 646 copy_filename(bp->bp_file, BootFile, sizeof(bp->bp_file)); 647 648 /* Request additional information from the BOOTP/DHCP server */ 649 #if defined(CONFIG_CMD_DHCP) 650 extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0); 651 #else 652 extlen = BootpExtended((u8 *)bp->bp_vend); 653 #endif 654 655 /* 656 * Bootp ID is the lower 4 bytes of our ethernet address 657 * plus the current time in ms. 658 */ 659 BootpID = ((ulong)NetOurEther[2] << 24) 660 | ((ulong)NetOurEther[3] << 16) 661 | ((ulong)NetOurEther[4] << 8) 662 | (ulong)NetOurEther[5]; 663 BootpID += get_timer(0); 664 BootpID = htonl(BootpID); 665 NetCopyLong(&bp->bp_id, &BootpID); 666 667 /* 668 * Calculate proper packet lengths taking into account the 669 * variable size of the options field 670 */ 671 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen; 672 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen; 673 net_set_udp_header(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); 674 NetSetTimeout(SELECT_TIMEOUT, BootpTimeout); 675 676 #if defined(CONFIG_CMD_DHCP) 677 dhcp_state = SELECTING; 678 net_set_udp_handler(DhcpHandler); 679 #else 680 net_set_udp_handler(BootpHandler); 681 #endif 682 NetSendPacket(NetTxPacket, pktlen); 683 } 684 685 #if defined(CONFIG_CMD_DHCP) 686 static void DhcpOptionsProcess(uchar *popt, struct Bootp_t *bp) 687 { 688 uchar *end = popt + BOOTP_HDR_SIZE; 689 int oplen, size; 690 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 691 int *to_ptr; 692 #endif 693 694 while (popt < end && *popt != 0xff) { 695 oplen = *(popt + 1); 696 switch (*popt) { 697 case 1: 698 NetCopyIP(&NetOurSubnetMask, (popt + 2)); 699 break; 700 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 701 case 2: /* Time offset */ 702 to_ptr = &NetTimeOffset; 703 NetCopyLong((ulong *)to_ptr, (ulong *)(popt + 2)); 704 NetTimeOffset = ntohl(NetTimeOffset); 705 break; 706 #endif 707 case 3: 708 NetCopyIP(&NetOurGatewayIP, (popt + 2)); 709 break; 710 case 6: 711 NetCopyIP(&NetOurDNSIP, (popt + 2)); 712 #if defined(CONFIG_BOOTP_DNS2) 713 if (*(popt + 1) > 4) 714 NetCopyIP(&NetOurDNS2IP, (popt + 2 + 4)); 715 #endif 716 break; 717 case 12: 718 size = truncate_sz("Host Name", 719 sizeof(NetOurHostName), oplen); 720 memcpy(&NetOurHostName, popt + 2, size); 721 NetOurHostName[size] = 0; 722 break; 723 case 15: /* Ignore Domain Name Option */ 724 break; 725 case 17: 726 size = truncate_sz("Root Path", 727 sizeof(NetOurRootPath), oplen); 728 memcpy(&NetOurRootPath, popt + 2, size); 729 NetOurRootPath[size] = 0; 730 break; 731 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 732 case 42: /* NTP server IP */ 733 NetCopyIP(&NetNtpServerIP, (popt + 2)); 734 break; 735 #endif 736 case 51: 737 NetCopyLong(&dhcp_leasetime, (ulong *) (popt + 2)); 738 break; 739 case 53: /* Ignore Message Type Option */ 740 break; 741 case 54: 742 NetCopyIP(&NetDHCPServerIP, (popt + 2)); 743 break; 744 case 58: /* Ignore Renewal Time Option */ 745 break; 746 case 59: /* Ignore Rebinding Time Option */ 747 break; 748 case 66: /* Ignore TFTP server name */ 749 break; 750 case 67: /* vendor opt bootfile */ 751 /* 752 * I can't use dhcp_vendorex_proc here because I need 753 * to write into the bootp packet - even then I had to 754 * pass the bootp packet pointer into here as the 755 * second arg 756 */ 757 size = truncate_sz("Opt Boot File", 758 sizeof(bp->bp_file), 759 oplen); 760 if (bp->bp_file[0] == '\0' && size > 0) { 761 /* 762 * only use vendor boot file if we didn't 763 * receive a boot file in the main non-vendor 764 * part of the packet - god only knows why 765 * some vendors chose not to use this perfectly 766 * good spot to store the boot file (join on 767 * Tru64 Unix) it seems mind bogglingly crazy 768 * to me 769 */ 770 printf("*** WARNING: using vendor " 771 "optional boot file\n"); 772 memcpy(bp->bp_file, popt + 2, size); 773 bp->bp_file[size] = '\0'; 774 } 775 break; 776 default: 777 #if defined(CONFIG_BOOTP_VENDOREX) 778 if (dhcp_vendorex_proc(popt)) 779 break; 780 #endif 781 printf("*** Unhandled DHCP Option in OFFER/ACK:" 782 " %d\n", *popt); 783 break; 784 } 785 popt += oplen + 2; /* Process next option */ 786 } 787 } 788 789 static int DhcpMessageType(unsigned char *popt) 790 { 791 if (NetReadLong((ulong *)popt) != htonl(BOOTP_VENDOR_MAGIC)) 792 return -1; 793 794 popt += 4; 795 while (*popt != 0xff) { 796 if (*popt == 53) /* DHCP Message Type */ 797 return *(popt + 2); 798 popt += *(popt + 1) + 2; /* Scan through all options */ 799 } 800 return -1; 801 } 802 803 static void DhcpSendRequestPkt(struct Bootp_t *bp_offer) 804 { 805 uchar *pkt, *iphdr; 806 struct Bootp_t *bp; 807 int pktlen, iplen, extlen; 808 int eth_hdr_size; 809 IPaddr_t OfferedIP; 810 811 debug("DhcpSendRequestPkt: Sending DHCPREQUEST\n"); 812 pkt = NetTxPacket; 813 memset((void *)pkt, 0, PKTSIZE); 814 815 eth_hdr_size = NetSetEther(pkt, NetBcastAddr, PROT_IP); 816 pkt += eth_hdr_size; 817 818 iphdr = pkt; /* We'll need this later to set proper pkt size */ 819 pkt += IP_UDP_HDR_SIZE; 820 821 bp = (struct Bootp_t *)pkt; 822 bp->bp_op = OP_BOOTREQUEST; 823 bp->bp_htype = HWT_ETHER; 824 bp->bp_hlen = HWL_ETHER; 825 bp->bp_hops = 0; 826 bp->bp_secs = htons(get_timer(0) / 1000); 827 /* Do not set the client IP, your IP, or server IP yet, since it 828 * hasn't been ACK'ed by the server yet */ 829 830 /* 831 * RFC3046 requires Relay Agents to discard packets with 832 * nonzero and offered giaddr 833 */ 834 NetWriteIP(&bp->bp_giaddr, 0); 835 836 memcpy(bp->bp_chaddr, NetOurEther, 6); 837 838 /* 839 * ID is the id of the OFFER packet 840 */ 841 842 NetCopyLong(&bp->bp_id, &bp_offer->bp_id); 843 844 /* 845 * Copy options from OFFER packet if present 846 */ 847 848 /* Copy offered IP into the parameters request list */ 849 NetCopyIP(&OfferedIP, &bp_offer->bp_yiaddr); 850 extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_REQUEST, 851 NetDHCPServerIP, OfferedIP); 852 853 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen; 854 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen; 855 net_set_udp_header(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); 856 857 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY 858 udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY); 859 #endif /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */ 860 debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen); 861 NetSendPacket(NetTxPacket, pktlen); 862 } 863 864 /* 865 * Handle DHCP received packets. 866 */ 867 static void 868 DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 869 unsigned len) 870 { 871 struct Bootp_t *bp = (struct Bootp_t *)pkt; 872 873 debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n", 874 src, dest, len, dhcp_state); 875 876 /* Filter out pkts we don't want */ 877 if (BootpCheckPkt(pkt, dest, src, len)) 878 return; 879 880 debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state:" 881 " %d\n", src, dest, len, dhcp_state); 882 883 switch (dhcp_state) { 884 case SELECTING: 885 /* 886 * Wait an appropriate time for any potential DHCPOFFER packets 887 * to arrive. Then select one, and generate DHCPREQUEST 888 * response. If filename is in format we recognize, assume it 889 * is a valid OFFER from a server we want. 890 */ 891 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file); 892 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 893 if (strncmp(bp->bp_file, 894 CONFIG_SYS_BOOTFILE_PREFIX, 895 strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) { 896 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 897 898 debug("TRANSITIONING TO REQUESTING STATE\n"); 899 dhcp_state = REQUESTING; 900 901 if (NetReadLong((ulong *)&bp->bp_vend[0]) == 902 htonl(BOOTP_VENDOR_MAGIC)) 903 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp); 904 905 NetSetTimeout(TIMEOUT, BootpTimeout); 906 DhcpSendRequestPkt(bp); 907 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 908 } 909 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 910 911 return; 912 break; 913 case REQUESTING: 914 debug("DHCP State: REQUESTING\n"); 915 916 if (DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK) { 917 if (NetReadLong((ulong *)&bp->bp_vend[0]) == 918 htonl(BOOTP_VENDOR_MAGIC)) 919 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp); 920 /* Store net params from reply */ 921 BootpCopyNetParams(bp); 922 dhcp_state = BOUND; 923 printf("DHCP client bound to address %pI4\n", 924 &NetOurIP); 925 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, 926 "bootp_stop"); 927 928 net_auto_load(); 929 return; 930 } 931 break; 932 case BOUND: 933 /* DHCP client bound to address */ 934 break; 935 default: 936 puts("DHCP: INVALID STATE\n"); 937 break; 938 } 939 940 } 941 942 void DhcpRequest(void) 943 { 944 BootpRequest(); 945 } 946 #endif /* CONFIG_CMD_DHCP */ 947