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 #include <linux/compiler.h> 22 23 #define BOOTP_VENDOR_MAGIC 0x63825363 /* RFC1048 Magic Cookie */ 24 25 #define TIMEOUT 5000UL /* Milliseconds before trying BOOTP again */ 26 #ifndef CONFIG_NET_RETRY_COUNT 27 # define TIMEOUT_COUNT 5 /* # of timeouts before giving up */ 28 #else 29 # define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT) 30 #endif 31 32 #define PORT_BOOTPS 67 /* BOOTP server UDP port */ 33 #define PORT_BOOTPC 68 /* BOOTP client UDP port */ 34 35 #ifndef CONFIG_DHCP_MIN_EXT_LEN /* minimal length of extension list */ 36 #define CONFIG_DHCP_MIN_EXT_LEN 64 37 #endif 38 39 ulong BootpID; 40 int BootpTry; 41 42 #if defined(CONFIG_CMD_DHCP) 43 dhcp_state_t dhcp_state = INIT; 44 unsigned long dhcp_leasetime; 45 IPaddr_t NetDHCPServerIP; 46 static void DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 47 unsigned len); 48 49 /* For Debug */ 50 #if 0 51 static char *dhcpmsg2str(int type) 52 { 53 switch (type) { 54 case 1: return "DHCPDISCOVER"; break; 55 case 2: return "DHCPOFFER"; break; 56 case 3: return "DHCPREQUEST"; break; 57 case 4: return "DHCPDECLINE"; break; 58 case 5: return "DHCPACK"; break; 59 case 6: return "DHCPNACK"; break; 60 case 7: return "DHCPRELEASE"; break; 61 default: return "UNKNOWN/INVALID MSG TYPE"; break; 62 } 63 } 64 #endif 65 #endif 66 67 static int BootpCheckPkt(uchar *pkt, unsigned dest, unsigned src, unsigned len) 68 { 69 struct Bootp_t *bp = (struct Bootp_t *) pkt; 70 int retval = 0; 71 72 if (dest != PORT_BOOTPC || src != PORT_BOOTPS) 73 retval = -1; 74 else if (len < sizeof(struct Bootp_t) - OPT_FIELD_SIZE) 75 retval = -2; 76 else if (bp->bp_op != OP_BOOTREQUEST && 77 bp->bp_op != OP_BOOTREPLY && 78 bp->bp_op != DHCP_OFFER && 79 bp->bp_op != DHCP_ACK && 80 bp->bp_op != DHCP_NAK) 81 retval = -3; 82 else if (bp->bp_htype != HWT_ETHER) 83 retval = -4; 84 else if (bp->bp_hlen != HWL_ETHER) 85 retval = -5; 86 else if (NetReadLong((ulong *)&bp->bp_id) != BootpID) 87 retval = -6; 88 89 debug("Filtering pkt = %d\n", retval); 90 91 return retval; 92 } 93 94 /* 95 * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet 96 */ 97 static void BootpCopyNetParams(struct Bootp_t *bp) 98 { 99 __maybe_unused IPaddr_t tmp_ip; 100 101 NetCopyIP(&NetOurIP, &bp->bp_yiaddr); 102 #if !defined(CONFIG_BOOTP_SERVERIP) 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 if (strlen(bp->bp_file) > 0) 109 copy_filename(BootFile, bp->bp_file, sizeof(BootFile)); 110 111 debug("Bootfile: %s\n", BootFile); 112 113 /* Propagate to environment: 114 * don't delete exising entry when BOOTP / DHCP reply does 115 * not contain a new value 116 */ 117 if (*BootFile) 118 setenv("bootfile", BootFile); 119 } 120 121 static int truncate_sz(const char *name, int maxlen, int curlen) 122 { 123 if (curlen >= maxlen) { 124 printf("*** WARNING: %s is too long (%d - max: %d)" 125 " - truncated\n", name, curlen, maxlen); 126 curlen = maxlen - 1; 127 } 128 return curlen; 129 } 130 131 #if !defined(CONFIG_CMD_DHCP) 132 133 static void BootpVendorFieldProcess(u8 *ext) 134 { 135 int size = *(ext + 1); 136 137 debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext, 138 *(ext + 1)); 139 140 NetBootFileSize = 0; 141 142 switch (*ext) { 143 /* Fixed length fields */ 144 case 1: /* Subnet mask */ 145 if (NetOurSubnetMask == 0) 146 NetCopyIP(&NetOurSubnetMask, (IPaddr_t *) (ext + 2)); 147 break; 148 case 2: /* Time offset - Not yet supported */ 149 break; 150 /* Variable length fields */ 151 case 3: /* Gateways list */ 152 if (NetOurGatewayIP == 0) 153 NetCopyIP(&NetOurGatewayIP, (IPaddr_t *) (ext + 2)); 154 break; 155 case 4: /* Time server - Not yet supported */ 156 break; 157 case 5: /* IEN-116 name server - Not yet supported */ 158 break; 159 case 6: 160 if (NetOurDNSIP == 0) 161 NetCopyIP(&NetOurDNSIP, (IPaddr_t *) (ext + 2)); 162 #if defined(CONFIG_BOOTP_DNS2) 163 if ((NetOurDNS2IP == 0) && (size > 4)) 164 NetCopyIP(&NetOurDNS2IP, (IPaddr_t *) (ext + 2 + 4)); 165 #endif 166 break; 167 case 7: /* Log server - Not yet supported */ 168 break; 169 case 8: /* Cookie/Quote server - Not yet supported */ 170 break; 171 case 9: /* LPR server - Not yet supported */ 172 break; 173 case 10: /* Impress server - Not yet supported */ 174 break; 175 case 11: /* RPL server - Not yet supported */ 176 break; 177 case 12: /* Host name */ 178 if (NetOurHostName[0] == 0) { 179 size = truncate_sz("Host Name", 180 sizeof(NetOurHostName), size); 181 memcpy(&NetOurHostName, ext + 2, size); 182 NetOurHostName[size] = 0; 183 } 184 break; 185 case 13: /* Boot file size */ 186 if (size == 2) 187 NetBootFileSize = ntohs(*(ushort *) (ext + 2)); 188 else if (size == 4) 189 NetBootFileSize = ntohl(*(ulong *) (ext + 2)); 190 break; 191 case 14: /* Merit dump file - Not yet supported */ 192 break; 193 case 15: /* Domain name - Not yet supported */ 194 break; 195 case 16: /* Swap server - Not yet supported */ 196 break; 197 case 17: /* Root path */ 198 if (NetOurRootPath[0] == 0) { 199 size = truncate_sz("Root Path", 200 sizeof(NetOurRootPath), size); 201 memcpy(&NetOurRootPath, ext + 2, size); 202 NetOurRootPath[size] = 0; 203 } 204 break; 205 case 18: /* Extension path - Not yet supported */ 206 /* 207 * This can be used to send the information of the 208 * vendor area in another file that the client can 209 * access via TFTP. 210 */ 211 break; 212 /* IP host layer fields */ 213 case 40: /* NIS Domain name */ 214 if (NetOurNISDomain[0] == 0) { 215 size = truncate_sz("NIS Domain Name", 216 sizeof(NetOurNISDomain), size); 217 memcpy(&NetOurNISDomain, ext + 2, size); 218 NetOurNISDomain[size] = 0; 219 } 220 break; 221 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 222 case 42: /* NTP server IP */ 223 NetCopyIP(&NetNtpServerIP, (IPaddr_t *) (ext + 2)); 224 break; 225 #endif 226 /* Application layer fields */ 227 case 43: /* Vendor specific info - Not yet supported */ 228 /* 229 * Binary information to exchange specific 230 * product information. 231 */ 232 break; 233 /* Reserved (custom) fields (128..254) */ 234 } 235 } 236 237 static void BootpVendorProcess(u8 *ext, int size) 238 { 239 u8 *end = ext + size; 240 241 debug("[BOOTP] Checking extension (%d bytes)...\n", size); 242 243 while ((ext < end) && (*ext != 0xff)) { 244 if (*ext == 0) { 245 ext++; 246 } else { 247 u8 *opt = ext; 248 249 ext += ext[1] + 2; 250 if (ext <= end) 251 BootpVendorFieldProcess(opt); 252 } 253 } 254 255 debug("[BOOTP] Received fields:\n"); 256 if (NetOurSubnetMask) 257 debug("NetOurSubnetMask : %pI4\n", &NetOurSubnetMask); 258 259 if (NetOurGatewayIP) 260 debug("NetOurGatewayIP : %pI4", &NetOurGatewayIP); 261 262 if (NetBootFileSize) 263 debug("NetBootFileSize : %d\n", NetBootFileSize); 264 265 if (NetOurHostName[0]) 266 debug("NetOurHostName : %s\n", NetOurHostName); 267 268 if (NetOurRootPath[0]) 269 debug("NetOurRootPath : %s\n", NetOurRootPath); 270 271 if (NetOurNISDomain[0]) 272 debug("NetOurNISDomain : %s\n", NetOurNISDomain); 273 274 if (NetBootFileSize) 275 debug("NetBootFileSize: %d\n", NetBootFileSize); 276 277 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 278 if (NetNtpServerIP) 279 debug("NetNtpServerIP : %pI4\n", &NetNtpServerIP); 280 #endif 281 } 282 283 /* 284 * Handle a BOOTP received packet. 285 */ 286 static void 287 BootpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 288 unsigned len) 289 { 290 struct Bootp_t *bp; 291 292 debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n", 293 src, dest, len, sizeof(struct Bootp_t)); 294 295 bp = (struct Bootp_t *)pkt; 296 297 /* Filter out pkts we don't want */ 298 if (BootpCheckPkt(pkt, dest, src, len)) 299 return; 300 301 /* 302 * Got a good BOOTP reply. Copy the data into our variables. 303 */ 304 #ifdef CONFIG_STATUS_LED 305 status_led_set(STATUS_LED_BOOT, STATUS_LED_OFF); 306 #endif 307 308 BootpCopyNetParams(bp); /* Store net parameters from reply */ 309 310 /* Retrieve extended information (we must parse the vendor area) */ 311 if (NetReadLong((ulong *)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 312 BootpVendorProcess((uchar *)&bp->bp_vend[4], len); 313 314 NetSetTimeout(0, (thand_f *)0); 315 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop"); 316 317 debug("Got good BOOTP\n"); 318 319 net_auto_load(); 320 } 321 #endif 322 323 /* 324 * Timeout on BOOTP/DHCP request. 325 */ 326 static void 327 BootpTimeout(void) 328 { 329 if (BootpTry >= TIMEOUT_COUNT) { 330 puts("\nRetry count exceeded; starting again\n"); 331 NetStartAgain(); 332 } else { 333 NetSetTimeout(TIMEOUT, BootpTimeout); 334 BootpRequest(); 335 } 336 } 337 338 /* 339 * Initialize BOOTP extension fields in the request. 340 */ 341 #if defined(CONFIG_CMD_DHCP) 342 static int DhcpExtended(u8 *e, int message_type, IPaddr_t ServerID, 343 IPaddr_t RequestedIP) 344 { 345 u8 *start = e; 346 u8 *cnt; 347 #if defined(CONFIG_BOOTP_PXE) 348 char *uuid; 349 size_t vci_strlen; 350 u16 clientarch; 351 #endif 352 353 #if defined(CONFIG_BOOTP_VENDOREX) 354 u8 *x; 355 #endif 356 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 357 char *hostname; 358 #endif 359 360 *e++ = 99; /* RFC1048 Magic Cookie */ 361 *e++ = 130; 362 *e++ = 83; 363 *e++ = 99; 364 365 *e++ = 53; /* DHCP Message Type */ 366 *e++ = 1; 367 *e++ = message_type; 368 369 *e++ = 57; /* Maximum DHCP Message Size */ 370 *e++ = 2; 371 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 8; 372 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff; 373 374 if (ServerID) { 375 int tmp = ntohl(ServerID); 376 377 *e++ = 54; /* ServerID */ 378 *e++ = 4; 379 *e++ = tmp >> 24; 380 *e++ = tmp >> 16; 381 *e++ = tmp >> 8; 382 *e++ = tmp & 0xff; 383 } 384 385 if (RequestedIP) { 386 int tmp = ntohl(RequestedIP); 387 388 *e++ = 50; /* Requested IP */ 389 *e++ = 4; 390 *e++ = tmp >> 24; 391 *e++ = tmp >> 16; 392 *e++ = tmp >> 8; 393 *e++ = tmp & 0xff; 394 } 395 #if defined(CONFIG_BOOTP_SEND_HOSTNAME) 396 hostname = getenv("hostname"); 397 if (hostname) { 398 int hostnamelen = strlen(hostname); 399 400 *e++ = 12; /* Hostname */ 401 *e++ = hostnamelen; 402 memcpy(e, hostname, hostnamelen); 403 e += hostnamelen; 404 } 405 #endif 406 407 #if defined(CONFIG_BOOTP_PXE) 408 clientarch = CONFIG_BOOTP_PXE_CLIENTARCH; 409 *e++ = 93; /* Client System Architecture */ 410 *e++ = 2; 411 *e++ = (clientarch >> 8) & 0xff; 412 *e++ = clientarch & 0xff; 413 414 *e++ = 94; /* Client Network Interface Identifier */ 415 *e++ = 3; 416 *e++ = 1; /* type field for UNDI */ 417 *e++ = 0; /* major revision */ 418 *e++ = 0; /* minor revision */ 419 420 uuid = getenv("pxeuuid"); 421 422 if (uuid) { 423 if (uuid_str_valid(uuid)) { 424 *e++ = 97; /* Client Machine Identifier */ 425 *e++ = 17; 426 *e++ = 0; /* type 0 - UUID */ 427 428 uuid_str_to_bin(uuid, e); 429 e += 16; 430 } else { 431 printf("Invalid pxeuuid: %s\n", uuid); 432 } 433 } 434 435 *e++ = 60; /* Vendor Class Identifier */ 436 vci_strlen = strlen(CONFIG_BOOTP_VCI_STRING); 437 *e++ = vci_strlen; 438 memcpy(e, CONFIG_BOOTP_VCI_STRING, vci_strlen); 439 e += vci_strlen; 440 #endif 441 442 #if defined(CONFIG_BOOTP_VENDOREX) 443 x = dhcp_vendorex_prep(e); 444 if (x) 445 return x - start; 446 #endif 447 448 *e++ = 55; /* Parameter Request List */ 449 cnt = e++; /* Pointer to count of requested items */ 450 *cnt = 0; 451 #if defined(CONFIG_BOOTP_SUBNETMASK) 452 *e++ = 1; /* Subnet Mask */ 453 *cnt += 1; 454 #endif 455 #if defined(CONFIG_BOOTP_TIMEOFFSET) 456 *e++ = 2; 457 *cnt += 1; 458 #endif 459 #if defined(CONFIG_BOOTP_GATEWAY) 460 *e++ = 3; /* Router Option */ 461 *cnt += 1; 462 #endif 463 #if defined(CONFIG_BOOTP_DNS) 464 *e++ = 6; /* DNS Server(s) */ 465 *cnt += 1; 466 #endif 467 #if defined(CONFIG_BOOTP_HOSTNAME) 468 *e++ = 12; /* Hostname */ 469 *cnt += 1; 470 #endif 471 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 472 *e++ = 13; /* Boot File Size */ 473 *cnt += 1; 474 #endif 475 #if defined(CONFIG_BOOTP_BOOTPATH) 476 *e++ = 17; /* Boot path */ 477 *cnt += 1; 478 #endif 479 #if defined(CONFIG_BOOTP_NISDOMAIN) 480 *e++ = 40; /* NIS Domain name request */ 481 *cnt += 1; 482 #endif 483 #if defined(CONFIG_BOOTP_NTPSERVER) 484 *e++ = 42; 485 *cnt += 1; 486 #endif 487 /* no options, so back up to avoid sending an empty request list */ 488 if (*cnt == 0) 489 e -= 2; 490 491 *e++ = 255; /* End of the list */ 492 493 /* Pad to minimal length */ 494 #ifdef CONFIG_DHCP_MIN_EXT_LEN 495 while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN) 496 *e++ = 0; 497 #endif 498 499 return e - start; 500 } 501 502 #else 503 /* 504 * Warning: no field size check - change CONFIG_BOOTP_* at your own risk! 505 */ 506 static int BootpExtended(u8 *e) 507 { 508 u8 *start = e; 509 510 *e++ = 99; /* RFC1048 Magic Cookie */ 511 *e++ = 130; 512 *e++ = 83; 513 *e++ = 99; 514 515 #if defined(CONFIG_CMD_DHCP) 516 *e++ = 53; /* DHCP Message Type */ 517 *e++ = 1; 518 *e++ = DHCP_DISCOVER; 519 520 *e++ = 57; /* Maximum DHCP Message Size */ 521 *e++ = 2; 522 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 16; 523 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff; 524 #endif 525 526 #if defined(CONFIG_BOOTP_SUBNETMASK) 527 *e++ = 1; /* Subnet mask request */ 528 *e++ = 4; 529 e += 4; 530 #endif 531 532 #if defined(CONFIG_BOOTP_GATEWAY) 533 *e++ = 3; /* Default gateway request */ 534 *e++ = 4; 535 e += 4; 536 #endif 537 538 #if defined(CONFIG_BOOTP_DNS) 539 *e++ = 6; /* Domain Name Server */ 540 *e++ = 4; 541 e += 4; 542 #endif 543 544 #if defined(CONFIG_BOOTP_HOSTNAME) 545 *e++ = 12; /* Host name request */ 546 *e++ = 32; 547 e += 32; 548 #endif 549 550 #if defined(CONFIG_BOOTP_BOOTFILESIZE) 551 *e++ = 13; /* Boot file size */ 552 *e++ = 2; 553 e += 2; 554 #endif 555 556 #if defined(CONFIG_BOOTP_BOOTPATH) 557 *e++ = 17; /* Boot path */ 558 *e++ = 32; 559 e += 32; 560 #endif 561 562 #if defined(CONFIG_BOOTP_NISDOMAIN) 563 *e++ = 40; /* NIS Domain name request */ 564 *e++ = 32; 565 e += 32; 566 #endif 567 #if defined(CONFIG_BOOTP_NTPSERVER) 568 *e++ = 42; 569 *e++ = 4; 570 e += 4; 571 #endif 572 573 *e++ = 255; /* End of the list */ 574 575 return e - start; 576 } 577 #endif 578 579 void 580 BootpRequest(void) 581 { 582 uchar *pkt, *iphdr; 583 struct Bootp_t *bp; 584 int extlen, pktlen, iplen; 585 int eth_hdr_size; 586 #ifdef CONFIG_BOOTP_RANDOM_DELAY 587 ulong i, rand_ms; 588 #endif 589 590 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start"); 591 #if defined(CONFIG_CMD_DHCP) 592 dhcp_state = INIT; 593 #endif 594 595 #ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */ 596 if (BootpTry == 0) 597 srand_mac(); 598 599 if (BootpTry <= 2) /* Start with max 1024 * 1ms */ 600 rand_ms = rand() >> (22 - BootpTry); 601 else /* After 3rd BOOTP request max 8192 * 1ms */ 602 rand_ms = rand() >> 19; 603 604 printf("Random delay: %ld ms...\n", rand_ms); 605 for (i = 0; i < rand_ms; i++) 606 udelay(1000); /*Wait 1ms*/ 607 608 #endif /* CONFIG_BOOTP_RANDOM_DELAY */ 609 610 printf("BOOTP broadcast %d\n", ++BootpTry); 611 pkt = NetTxPacket; 612 memset((void *)pkt, 0, PKTSIZE); 613 614 eth_hdr_size = NetSetEther(pkt, NetBcastAddr, PROT_IP); 615 pkt += eth_hdr_size; 616 617 /* 618 * Next line results in incorrect packet size being transmitted, 619 * resulting in errors in some DHCP servers, reporting missing bytes. 620 * Size must be set in packet header after extension length has been 621 * determined. 622 * C. Hallinan, DS4.COM, Inc. 623 */ 624 /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, 625 sizeof (struct Bootp_t)); */ 626 iphdr = pkt; /* We need this later for net_set_udp_header() */ 627 pkt += IP_UDP_HDR_SIZE; 628 629 bp = (struct Bootp_t *)pkt; 630 bp->bp_op = OP_BOOTREQUEST; 631 bp->bp_htype = HWT_ETHER; 632 bp->bp_hlen = HWL_ETHER; 633 bp->bp_hops = 0; 634 bp->bp_secs = htons(get_timer(0) / 1000); 635 NetWriteIP(&bp->bp_ciaddr, 0); 636 NetWriteIP(&bp->bp_yiaddr, 0); 637 NetWriteIP(&bp->bp_siaddr, 0); 638 NetWriteIP(&bp->bp_giaddr, 0); 639 memcpy(bp->bp_chaddr, NetOurEther, 6); 640 copy_filename(bp->bp_file, BootFile, sizeof(bp->bp_file)); 641 642 /* Request additional information from the BOOTP/DHCP server */ 643 #if defined(CONFIG_CMD_DHCP) 644 extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0); 645 #else 646 extlen = BootpExtended((u8 *)bp->bp_vend); 647 #endif 648 649 /* 650 * Bootp ID is the lower 4 bytes of our ethernet address 651 * plus the current time in ms. 652 */ 653 BootpID = ((ulong)NetOurEther[2] << 24) 654 | ((ulong)NetOurEther[3] << 16) 655 | ((ulong)NetOurEther[4] << 8) 656 | (ulong)NetOurEther[5]; 657 BootpID += get_timer(0); 658 BootpID = htonl(BootpID); 659 NetCopyLong(&bp->bp_id, &BootpID); 660 661 /* 662 * Calculate proper packet lengths taking into account the 663 * variable size of the options field 664 */ 665 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen; 666 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen; 667 net_set_udp_header(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); 668 NetSetTimeout(SELECT_TIMEOUT, BootpTimeout); 669 670 #if defined(CONFIG_CMD_DHCP) 671 dhcp_state = SELECTING; 672 NetSetHandler(DhcpHandler); 673 #else 674 NetSetHandler(BootpHandler); 675 #endif 676 NetSendPacket(NetTxPacket, pktlen); 677 } 678 679 #if defined(CONFIG_CMD_DHCP) 680 static void DhcpOptionsProcess(uchar *popt, struct Bootp_t *bp) 681 { 682 uchar *end = popt + BOOTP_HDR_SIZE; 683 int oplen, size; 684 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 685 int *to_ptr; 686 #endif 687 688 while (popt < end && *popt != 0xff) { 689 oplen = *(popt + 1); 690 switch (*popt) { 691 case 1: 692 NetCopyIP(&NetOurSubnetMask, (popt + 2)); 693 break; 694 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 695 case 2: /* Time offset */ 696 to_ptr = &NetTimeOffset; 697 NetCopyLong((ulong *)to_ptr, (ulong *)(popt + 2)); 698 NetTimeOffset = ntohl(NetTimeOffset); 699 break; 700 #endif 701 case 3: 702 NetCopyIP(&NetOurGatewayIP, (popt + 2)); 703 break; 704 case 6: 705 NetCopyIP(&NetOurDNSIP, (popt + 2)); 706 #if defined(CONFIG_BOOTP_DNS2) 707 if (*(popt + 1) > 4) 708 NetCopyIP(&NetOurDNS2IP, (popt + 2 + 4)); 709 #endif 710 break; 711 case 12: 712 size = truncate_sz("Host Name", 713 sizeof(NetOurHostName), oplen); 714 memcpy(&NetOurHostName, popt + 2, size); 715 NetOurHostName[size] = 0; 716 break; 717 case 15: /* Ignore Domain Name Option */ 718 break; 719 case 17: 720 size = truncate_sz("Root Path", 721 sizeof(NetOurRootPath), oplen); 722 memcpy(&NetOurRootPath, popt + 2, size); 723 NetOurRootPath[size] = 0; 724 break; 725 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 726 case 42: /* NTP server IP */ 727 NetCopyIP(&NetNtpServerIP, (popt + 2)); 728 break; 729 #endif 730 case 51: 731 NetCopyLong(&dhcp_leasetime, (ulong *) (popt + 2)); 732 break; 733 case 53: /* Ignore Message Type Option */ 734 break; 735 case 54: 736 NetCopyIP(&NetDHCPServerIP, (popt + 2)); 737 break; 738 case 58: /* Ignore Renewal Time Option */ 739 break; 740 case 59: /* Ignore Rebinding Time Option */ 741 break; 742 case 66: /* Ignore TFTP server name */ 743 break; 744 case 67: /* vendor opt bootfile */ 745 /* 746 * I can't use dhcp_vendorex_proc here because I need 747 * to write into the bootp packet - even then I had to 748 * pass the bootp packet pointer into here as the 749 * second arg 750 */ 751 size = truncate_sz("Opt Boot File", 752 sizeof(bp->bp_file), 753 oplen); 754 if (bp->bp_file[0] == '\0' && size > 0) { 755 /* 756 * only use vendor boot file if we didn't 757 * receive a boot file in the main non-vendor 758 * part of the packet - god only knows why 759 * some vendors chose not to use this perfectly 760 * good spot to store the boot file (join on 761 * Tru64 Unix) it seems mind bogglingly crazy 762 * to me 763 */ 764 printf("*** WARNING: using vendor " 765 "optional boot file\n"); 766 memcpy(bp->bp_file, popt + 2, size); 767 bp->bp_file[size] = '\0'; 768 } 769 break; 770 default: 771 #if defined(CONFIG_BOOTP_VENDOREX) 772 if (dhcp_vendorex_proc(popt)) 773 break; 774 #endif 775 printf("*** Unhandled DHCP Option in OFFER/ACK:" 776 " %d\n", *popt); 777 break; 778 } 779 popt += oplen + 2; /* Process next option */ 780 } 781 } 782 783 static int DhcpMessageType(unsigned char *popt) 784 { 785 if (NetReadLong((ulong *)popt) != htonl(BOOTP_VENDOR_MAGIC)) 786 return -1; 787 788 popt += 4; 789 while (*popt != 0xff) { 790 if (*popt == 53) /* DHCP Message Type */ 791 return *(popt + 2); 792 popt += *(popt + 1) + 2; /* Scan through all options */ 793 } 794 return -1; 795 } 796 797 static void DhcpSendRequestPkt(struct Bootp_t *bp_offer) 798 { 799 uchar *pkt, *iphdr; 800 struct Bootp_t *bp; 801 int pktlen, iplen, extlen; 802 int eth_hdr_size; 803 IPaddr_t OfferedIP; 804 805 debug("DhcpSendRequestPkt: Sending DHCPREQUEST\n"); 806 pkt = NetTxPacket; 807 memset((void *)pkt, 0, PKTSIZE); 808 809 eth_hdr_size = NetSetEther(pkt, NetBcastAddr, PROT_IP); 810 pkt += eth_hdr_size; 811 812 iphdr = pkt; /* We'll need this later to set proper pkt size */ 813 pkt += IP_UDP_HDR_SIZE; 814 815 bp = (struct Bootp_t *)pkt; 816 bp->bp_op = OP_BOOTREQUEST; 817 bp->bp_htype = HWT_ETHER; 818 bp->bp_hlen = HWL_ETHER; 819 bp->bp_hops = 0; 820 bp->bp_secs = htons(get_timer(0) / 1000); 821 /* Do not set the client IP, your IP, or server IP yet, since it 822 * hasn't been ACK'ed by the server yet */ 823 824 /* 825 * RFC3046 requires Relay Agents to discard packets with 826 * nonzero and offered giaddr 827 */ 828 NetWriteIP(&bp->bp_giaddr, 0); 829 830 memcpy(bp->bp_chaddr, NetOurEther, 6); 831 832 /* 833 * ID is the id of the OFFER packet 834 */ 835 836 NetCopyLong(&bp->bp_id, &bp_offer->bp_id); 837 838 /* 839 * Copy options from OFFER packet if present 840 */ 841 842 /* Copy offered IP into the parameters request list */ 843 NetCopyIP(&OfferedIP, &bp_offer->bp_yiaddr); 844 extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_REQUEST, 845 NetDHCPServerIP, OfferedIP); 846 847 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen; 848 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen; 849 net_set_udp_header(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen); 850 851 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY 852 udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY); 853 #endif /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */ 854 debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen); 855 NetSendPacket(NetTxPacket, pktlen); 856 } 857 858 /* 859 * Handle DHCP received packets. 860 */ 861 static void 862 DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 863 unsigned len) 864 { 865 struct Bootp_t *bp = (struct Bootp_t *)pkt; 866 867 debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n", 868 src, dest, len, dhcp_state); 869 870 /* Filter out pkts we don't want */ 871 if (BootpCheckPkt(pkt, dest, src, len)) 872 return; 873 874 debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state:" 875 " %d\n", src, dest, len, dhcp_state); 876 877 switch (dhcp_state) { 878 case SELECTING: 879 /* 880 * Wait an appropriate time for any potential DHCPOFFER packets 881 * to arrive. Then select one, and generate DHCPREQUEST 882 * response. If filename is in format we recognize, assume it 883 * is a valid OFFER from a server we want. 884 */ 885 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file); 886 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 887 if (strncmp(bp->bp_file, 888 CONFIG_SYS_BOOTFILE_PREFIX, 889 strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) { 890 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 891 892 debug("TRANSITIONING TO REQUESTING STATE\n"); 893 dhcp_state = REQUESTING; 894 895 if (NetReadLong((ulong *)&bp->bp_vend[0]) == 896 htonl(BOOTP_VENDOR_MAGIC)) 897 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp); 898 899 NetSetTimeout(TIMEOUT, BootpTimeout); 900 DhcpSendRequestPkt(bp); 901 #ifdef CONFIG_SYS_BOOTFILE_PREFIX 902 } 903 #endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 904 905 return; 906 break; 907 case REQUESTING: 908 debug("DHCP State: REQUESTING\n"); 909 910 if (DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK) { 911 if (NetReadLong((ulong *)&bp->bp_vend[0]) == 912 htonl(BOOTP_VENDOR_MAGIC)) 913 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp); 914 /* Store net params from reply */ 915 BootpCopyNetParams(bp); 916 dhcp_state = BOUND; 917 printf("DHCP client bound to address %pI4\n", 918 &NetOurIP); 919 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, 920 "bootp_stop"); 921 922 net_auto_load(); 923 return; 924 } 925 break; 926 case BOUND: 927 /* DHCP client bound to address */ 928 break; 929 default: 930 puts("DHCP: INVALID STATE\n"); 931 break; 932 } 933 934 } 935 936 void DhcpRequest(void) 937 { 938 BootpRequest(); 939 } 940 #endif /* CONFIG_CMD_DHCP */ 941