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