1 /* 2 * Copied from Linux Monitor (LiMon) - Networking. 3 * 4 * Copyright 1994 - 2000 Neil Russell. 5 * (See License) 6 * Copyright 2000 Roland Borde 7 * Copyright 2000 Paolo Scaffardi 8 * Copyright 2000-2002 Wolfgang Denk, wd@denx.de 9 */ 10 11 /* 12 * General Desription: 13 * 14 * The user interface supports commands for BOOTP, RARP, and TFTP. 15 * Also, we support ARP internally. Depending on available data, 16 * these interact as follows: 17 * 18 * BOOTP: 19 * 20 * Prerequisites: - own ethernet address 21 * We want: - own IP address 22 * - TFTP server IP address 23 * - name of bootfile 24 * Next step: ARP 25 * 26 * RARP: 27 * 28 * Prerequisites: - own ethernet address 29 * We want: - own IP address 30 * - TFTP server IP address 31 * Next step: ARP 32 * 33 * ARP: 34 * 35 * Prerequisites: - own ethernet address 36 * - own IP address 37 * - TFTP server IP address 38 * We want: - TFTP server ethernet address 39 * Next step: TFTP 40 * 41 * DHCP: 42 * 43 * Prerequisites: - own ethernet address 44 * We want: - IP, Netmask, ServerIP, Gateway IP 45 * - bootfilename, lease time 46 * Next step: - TFTP 47 * 48 * TFTP: 49 * 50 * Prerequisites: - own ethernet address 51 * - own IP address 52 * - TFTP server IP address 53 * - TFTP server ethernet address 54 * - name of bootfile (if unknown, we use a default name 55 * derived from our own IP address) 56 * We want: - load the boot file 57 * Next step: none 58 * 59 * NFS: 60 * 61 * Prerequisites: - own ethernet address 62 * - own IP address 63 * - name of bootfile (if unknown, we use a default name 64 * derived from our own IP address) 65 * We want: - load the boot file 66 * Next step: none 67 * 68 * SNTP: 69 * 70 * Prerequisites: - own ethernet address 71 * - own IP address 72 * We want: - network time 73 * Next step: none 74 */ 75 76 77 #include <common.h> 78 #include <watchdog.h> 79 #include <command.h> 80 #include <net.h> 81 #include "bootp.h" 82 #include "tftp.h" 83 #ifdef CONFIG_CMD_RARP 84 #include "rarp.h" 85 #endif 86 #include "nfs.h" 87 #ifdef CONFIG_STATUS_LED 88 #include <status_led.h> 89 #include <miiphy.h> 90 #endif 91 #if defined(CONFIG_CMD_SNTP) 92 #include "sntp.h" 93 #endif 94 #if defined(CONFIG_CDP_VERSION) 95 #include <timestamp.h> 96 #endif 97 #if defined(CONFIG_CMD_DNS) 98 #include "dns.h" 99 #endif 100 101 DECLARE_GLOBAL_DATA_PTR; 102 103 #ifndef CONFIG_ARP_TIMEOUT 104 /* Milliseconds before trying ARP again */ 105 # define ARP_TIMEOUT 5000UL 106 #else 107 # define ARP_TIMEOUT CONFIG_ARP_TIMEOUT 108 #endif 109 110 111 #ifndef CONFIG_NET_RETRY_COUNT 112 # define ARP_TIMEOUT_COUNT 5 /* # of timeouts before giving up */ 113 #else 114 # define ARP_TIMEOUT_COUNT CONFIG_NET_RETRY_COUNT 115 #endif 116 117 /** BOOTP EXTENTIONS **/ 118 119 /* Our subnet mask (0=unknown) */ 120 IPaddr_t NetOurSubnetMask; 121 /* Our gateways IP address */ 122 IPaddr_t NetOurGatewayIP; 123 /* Our DNS IP address */ 124 IPaddr_t NetOurDNSIP; 125 #if defined(CONFIG_BOOTP_DNS2) 126 /* Our 2nd DNS IP address */ 127 IPaddr_t NetOurDNS2IP; 128 #endif 129 /* Our NIS domain */ 130 char NetOurNISDomain[32] = {0,}; 131 /* Our hostname */ 132 char NetOurHostName[32] = {0,}; 133 /* Our bootpath */ 134 char NetOurRootPath[64] = {0,}; 135 /* Our bootfile size in blocks */ 136 ushort NetBootFileSize; 137 138 #ifdef CONFIG_MCAST_TFTP /* Multicast TFTP */ 139 IPaddr_t Mcast_addr; 140 #endif 141 142 /** END OF BOOTP EXTENTIONS **/ 143 144 /* The actual transferred size of the bootfile (in bytes) */ 145 ulong NetBootFileXferSize; 146 /* Our ethernet address */ 147 uchar NetOurEther[6]; 148 /* Boot server enet address */ 149 uchar NetServerEther[6]; 150 /* Our IP addr (0 = unknown) */ 151 IPaddr_t NetOurIP; 152 /* Server IP addr (0 = unknown) */ 153 IPaddr_t NetServerIP; 154 /* Current receive packet */ 155 volatile uchar *NetRxPacket; 156 /* Current rx packet length */ 157 int NetRxPacketLen; 158 /* IP packet ID */ 159 unsigned NetIPID; 160 /* Ethernet bcast address */ 161 uchar NetBcastAddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 162 uchar NetEtherNullAddr[6]; 163 #ifdef CONFIG_API 164 void (*push_packet)(volatile void *, int len) = 0; 165 #endif 166 #if defined(CONFIG_CMD_CDP) 167 /* Ethernet bcast address */ 168 uchar NetCDPAddr[6] = { 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc }; 169 #endif 170 /* Network loop state */ 171 int NetState; 172 /* Tried all network devices */ 173 int NetRestartWrap; 174 /* Network loop restarted */ 175 static int NetRestarted; 176 /* At least one device configured */ 177 static int NetDevExists; 178 179 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */ 180 /* default is without VLAN */ 181 ushort NetOurVLAN = 0xFFFF; 182 /* ditto */ 183 ushort NetOurNativeVLAN = 0xFFFF; 184 185 /* Boot File name */ 186 char BootFile[128]; 187 188 #if defined(CONFIG_CMD_PING) 189 /* the ip address to ping */ 190 IPaddr_t NetPingIP; 191 192 static void PingStart(void); 193 #endif 194 195 #if defined(CONFIG_CMD_CDP) 196 static void CDPStart(void); 197 #endif 198 199 #if defined(CONFIG_CMD_SNTP) 200 /* NTP server IP address */ 201 IPaddr_t NetNtpServerIP; 202 /* offset time from UTC */ 203 int NetTimeOffset; 204 #endif 205 206 #ifdef CONFIG_NETCONSOLE 207 void NcStart(void); 208 int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len); 209 #endif 210 211 volatile uchar PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN]; 212 213 /* Receive packet */ 214 volatile uchar *NetRxPackets[PKTBUFSRX]; 215 216 /* Current RX packet handler */ 217 static rxhand_f *packetHandler; 218 /* Current timeout handler */ 219 static thand_f *timeHandler; 220 /* Time base value */ 221 static ulong timeStart; 222 /* Current timeout value */ 223 static ulong timeDelta; 224 /* THE transmit packet */ 225 volatile uchar *NetTxPacket; 226 227 static int net_check_prereq(proto_t protocol); 228 229 static int NetTryCount; 230 231 /**********************************************************************/ 232 233 IPaddr_t NetArpWaitPacketIP; 234 IPaddr_t NetArpWaitReplyIP; 235 /* MAC address of waiting packet's destination */ 236 uchar *NetArpWaitPacketMAC; 237 /* THE transmit packet */ 238 uchar *NetArpWaitTxPacket; 239 int NetArpWaitTxPacketSize; 240 uchar NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN]; 241 ulong NetArpWaitTimerStart; 242 int NetArpWaitTry; 243 244 void ArpRequest(void) 245 { 246 int i; 247 volatile uchar *pkt; 248 ARP_t *arp; 249 250 debug("ARP broadcast %d\n", NetArpWaitTry); 251 252 pkt = NetTxPacket; 253 254 pkt += NetSetEther(pkt, NetBcastAddr, PROT_ARP); 255 256 arp = (ARP_t *) pkt; 257 258 arp->ar_hrd = htons(ARP_ETHER); 259 arp->ar_pro = htons(PROT_IP); 260 arp->ar_hln = 6; 261 arp->ar_pln = 4; 262 arp->ar_op = htons(ARPOP_REQUEST); 263 264 /* source ET addr */ 265 memcpy(&arp->ar_data[0], NetOurEther, 6); 266 /* source IP addr */ 267 NetWriteIP((uchar *) &arp->ar_data[6], NetOurIP); 268 for (i = 10; i < 16; ++i) { 269 /* dest ET addr = 0 */ 270 arp->ar_data[i] = 0; 271 } 272 273 if ((NetArpWaitPacketIP & NetOurSubnetMask) != 274 (NetOurIP & NetOurSubnetMask)) { 275 if (NetOurGatewayIP == 0) { 276 puts("## Warning: gatewayip needed but not set\n"); 277 NetArpWaitReplyIP = NetArpWaitPacketIP; 278 } else { 279 NetArpWaitReplyIP = NetOurGatewayIP; 280 } 281 } else { 282 NetArpWaitReplyIP = NetArpWaitPacketIP; 283 } 284 285 NetWriteIP((uchar *) &arp->ar_data[16], NetArpWaitReplyIP); 286 (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE); 287 } 288 289 void ArpTimeoutCheck(void) 290 { 291 ulong t; 292 293 if (!NetArpWaitPacketIP) 294 return; 295 296 t = get_timer(0); 297 298 /* check for arp timeout */ 299 if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT) { 300 NetArpWaitTry++; 301 302 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) { 303 puts("\nARP Retry count exceeded; starting again\n"); 304 NetArpWaitTry = 0; 305 NetStartAgain(); 306 } else { 307 NetArpWaitTimerStart = t; 308 ArpRequest(); 309 } 310 } 311 } 312 313 static void 314 NetInitLoop(proto_t protocol) 315 { 316 static int env_changed_id; 317 bd_t *bd = gd->bd; 318 int env_id = get_env_id(); 319 320 /* update only when the environment has changed */ 321 if (env_changed_id != env_id) { 322 NetOurIP = getenv_IPaddr("ipaddr"); 323 NetCopyIP(&bd->bi_ip_addr, &NetOurIP); 324 NetOurGatewayIP = getenv_IPaddr("gatewayip"); 325 NetOurSubnetMask = getenv_IPaddr("netmask"); 326 NetServerIP = getenv_IPaddr("serverip"); 327 NetOurNativeVLAN = getenv_VLAN("nvlan"); 328 NetOurVLAN = getenv_VLAN("vlan"); 329 #if defined(CONFIG_CMD_DNS) 330 NetOurDNSIP = getenv_IPaddr("dnsip"); 331 #endif 332 env_changed_id = env_id; 333 } 334 335 return; 336 } 337 338 /**********************************************************************/ 339 /* 340 * Main network processing loop. 341 */ 342 343 int 344 NetLoop(proto_t protocol) 345 { 346 bd_t *bd = gd->bd; 347 348 NetRestarted = 0; 349 NetDevExists = 0; 350 351 /* XXX problem with bss workaround */ 352 NetArpWaitPacketMAC = NULL; 353 NetArpWaitTxPacket = NULL; 354 NetArpWaitPacketIP = 0; 355 NetArpWaitReplyIP = 0; 356 NetArpWaitTxPacket = NULL; 357 NetTxPacket = NULL; 358 NetTryCount = 1; 359 360 if (!NetTxPacket) { 361 int i; 362 /* 363 * Setup packet buffers, aligned correctly. 364 */ 365 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1); 366 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN; 367 for (i = 0; i < PKTBUFSRX; i++) 368 NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN; 369 } 370 371 if (!NetArpWaitTxPacket) { 372 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1); 373 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN; 374 NetArpWaitTxPacketSize = 0; 375 } 376 377 eth_halt(); 378 eth_set_current(); 379 if (eth_init(bd) < 0) { 380 eth_halt(); 381 return -1; 382 } 383 384 restart: 385 memcpy(NetOurEther, eth_get_dev()->enetaddr, 6); 386 387 NetState = NETLOOP_CONTINUE; 388 389 /* 390 * Start the ball rolling with the given start function. From 391 * here on, this code is a state machine driven by received 392 * packets and timer events. 393 */ 394 NetInitLoop(protocol); 395 396 switch (net_check_prereq(protocol)) { 397 case 1: 398 /* network not configured */ 399 eth_halt(); 400 return -1; 401 402 case 2: 403 /* network device not configured */ 404 break; 405 406 case 0: 407 NetDevExists = 1; 408 switch (protocol) { 409 case TFTP: 410 /* always use ARP to get server ethernet address */ 411 TftpStart(); 412 break; 413 #ifdef CONFIG_CMD_TFTPSRV 414 case TFTPSRV: 415 TftpStartServer(); 416 break; 417 #endif 418 #if defined(CONFIG_CMD_DHCP) 419 case DHCP: 420 BootpTry = 0; 421 NetOurIP = 0; 422 DhcpRequest(); /* Basically same as BOOTP */ 423 break; 424 #endif 425 426 case BOOTP: 427 BootpTry = 0; 428 NetOurIP = 0; 429 BootpRequest(); 430 break; 431 432 #if defined(CONFIG_CMD_RARP) 433 case RARP: 434 RarpTry = 0; 435 NetOurIP = 0; 436 RarpRequest(); 437 break; 438 #endif 439 #if defined(CONFIG_CMD_PING) 440 case PING: 441 PingStart(); 442 break; 443 #endif 444 #if defined(CONFIG_CMD_NFS) 445 case NFS: 446 NfsStart(); 447 break; 448 #endif 449 #if defined(CONFIG_CMD_CDP) 450 case CDP: 451 CDPStart(); 452 break; 453 #endif 454 #ifdef CONFIG_NETCONSOLE 455 case NETCONS: 456 NcStart(); 457 break; 458 #endif 459 #if defined(CONFIG_CMD_SNTP) 460 case SNTP: 461 SntpStart(); 462 break; 463 #endif 464 #if defined(CONFIG_CMD_DNS) 465 case DNS: 466 DnsStart(); 467 break; 468 #endif 469 default: 470 break; 471 } 472 473 NetBootFileXferSize = 0; 474 break; 475 } 476 477 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 478 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ 479 defined(CONFIG_STATUS_LED) && \ 480 defined(STATUS_LED_RED) 481 /* 482 * Echo the inverted link state to the fault LED. 483 */ 484 if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) 485 status_led_set(STATUS_LED_RED, STATUS_LED_OFF); 486 else 487 status_led_set(STATUS_LED_RED, STATUS_LED_ON); 488 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 489 #endif /* CONFIG_MII, ... */ 490 491 /* 492 * Main packet reception loop. Loop receiving packets until 493 * someone sets `NetState' to a state that terminates. 494 */ 495 for (;;) { 496 WATCHDOG_RESET(); 497 #ifdef CONFIG_SHOW_ACTIVITY 498 { 499 extern void show_activity(int arg); 500 show_activity(1); 501 } 502 #endif 503 /* 504 * Check the ethernet for a new packet. The ethernet 505 * receive routine will process it. 506 */ 507 eth_rx(); 508 509 /* 510 * Abort if ctrl-c was pressed. 511 */ 512 if (ctrlc()) { 513 eth_halt(); 514 puts("\nAbort\n"); 515 return -1; 516 } 517 518 ArpTimeoutCheck(); 519 520 /* 521 * Check for a timeout, and run the timeout handler 522 * if we have one. 523 */ 524 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) { 525 thand_f *x; 526 527 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 528 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ 529 defined(CONFIG_STATUS_LED) && \ 530 defined(STATUS_LED_RED) 531 /* 532 * Echo the inverted link state to the fault LED. 533 */ 534 if (miiphy_link(eth_get_dev()->name, 535 CONFIG_SYS_FAULT_MII_ADDR)) { 536 status_led_set(STATUS_LED_RED, STATUS_LED_OFF); 537 } else { 538 status_led_set(STATUS_LED_RED, STATUS_LED_ON); 539 } 540 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 541 #endif /* CONFIG_MII, ... */ 542 x = timeHandler; 543 timeHandler = (thand_f *)0; 544 (*x)(); 545 } 546 547 548 switch (NetState) { 549 550 case NETLOOP_RESTART: 551 NetRestarted = 1; 552 goto restart; 553 554 case NETLOOP_SUCCESS: 555 if (NetBootFileXferSize > 0) { 556 char buf[20]; 557 printf("Bytes transferred = %ld (%lx hex)\n", 558 NetBootFileXferSize, 559 NetBootFileXferSize); 560 sprintf(buf, "%lX", NetBootFileXferSize); 561 setenv("filesize", buf); 562 563 sprintf(buf, "%lX", (unsigned long)load_addr); 564 setenv("fileaddr", buf); 565 } 566 eth_halt(); 567 return NetBootFileXferSize; 568 569 case NETLOOP_FAIL: 570 return -1; 571 } 572 } 573 } 574 575 /**********************************************************************/ 576 577 static void 578 startAgainTimeout(void) 579 { 580 NetState = NETLOOP_RESTART; 581 } 582 583 static void 584 startAgainHandler(uchar *pkt, unsigned dest, IPaddr_t sip, 585 unsigned src, unsigned len) 586 { 587 /* Totally ignore the packet */ 588 } 589 590 void NetStartAgain(void) 591 { 592 char *nretry; 593 int retry_forever = 0; 594 unsigned long retrycnt = 0; 595 596 nretry = getenv("netretry"); 597 if (nretry) { 598 if (!strcmp(nretry, "yes")) 599 retry_forever = 1; 600 else if (!strcmp(nretry, "no")) 601 retrycnt = 0; 602 else if (!strcmp(nretry, "once")) 603 retrycnt = 1; 604 else 605 retrycnt = simple_strtoul(nretry, NULL, 0); 606 } else 607 retry_forever = 1; 608 609 if ((!retry_forever) && (NetTryCount >= retrycnt)) { 610 eth_halt(); 611 NetState = NETLOOP_FAIL; 612 return; 613 } 614 615 NetTryCount++; 616 617 eth_halt(); 618 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER) 619 eth_try_another(!NetRestarted); 620 #endif 621 eth_init(gd->bd); 622 if (NetRestartWrap) { 623 NetRestartWrap = 0; 624 if (NetDevExists) { 625 NetSetTimeout(10000UL, startAgainTimeout); 626 NetSetHandler(startAgainHandler); 627 } else { 628 NetState = NETLOOP_FAIL; 629 } 630 } else { 631 NetState = NETLOOP_RESTART; 632 } 633 } 634 635 /**********************************************************************/ 636 /* 637 * Miscelaneous bits. 638 */ 639 640 void 641 NetSetHandler(rxhand_f *f) 642 { 643 packetHandler = f; 644 } 645 646 647 void 648 NetSetTimeout(ulong iv, thand_f *f) 649 { 650 if (iv == 0) { 651 timeHandler = (thand_f *)0; 652 } else { 653 timeHandler = f; 654 timeStart = get_timer(0); 655 timeDelta = iv; 656 } 657 } 658 659 660 void 661 NetSendPacket(volatile uchar *pkt, int len) 662 { 663 (void) eth_send(pkt, len); 664 } 665 666 int 667 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len) 668 { 669 uchar *pkt; 670 671 /* convert to new style broadcast */ 672 if (dest == 0) 673 dest = 0xFFFFFFFF; 674 675 /* if broadcast, make the ether address a broadcast and don't do ARP */ 676 if (dest == 0xFFFFFFFF) 677 ether = NetBcastAddr; 678 679 /* 680 * if MAC address was not discovered yet, save the packet and do 681 * an ARP request 682 */ 683 if (memcmp(ether, NetEtherNullAddr, 6) == 0) { 684 685 debug("sending ARP for %08lx\n", dest); 686 687 NetArpWaitPacketIP = dest; 688 NetArpWaitPacketMAC = ether; 689 690 pkt = NetArpWaitTxPacket; 691 pkt += NetSetEther(pkt, NetArpWaitPacketMAC, PROT_IP); 692 693 NetSetIP(pkt, dest, dport, sport, len); 694 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + 695 (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len); 696 697 /* size of the waiting packet */ 698 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + 699 IP_HDR_SIZE + len; 700 701 /* and do the ARP request */ 702 NetArpWaitTry = 1; 703 NetArpWaitTimerStart = get_timer(0); 704 ArpRequest(); 705 return 1; /* waiting */ 706 } 707 708 debug("sending UDP to %08lx/%pM\n", dest, ether); 709 710 pkt = (uchar *)NetTxPacket; 711 pkt += NetSetEther(pkt, ether, PROT_IP); 712 NetSetIP(pkt, dest, dport, sport, len); 713 (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len); 714 715 return 0; /* transmitted */ 716 } 717 718 #if defined(CONFIG_CMD_PING) 719 static ushort PingSeqNo; 720 721 int PingSend(void) 722 { 723 static uchar mac[6]; 724 volatile IP_t *ip; 725 volatile ushort *s; 726 uchar *pkt; 727 728 /* XXX always send arp request */ 729 730 memcpy(mac, NetEtherNullAddr, 6); 731 732 debug("sending ARP for %08lx\n", NetPingIP); 733 734 NetArpWaitPacketIP = NetPingIP; 735 NetArpWaitPacketMAC = mac; 736 737 pkt = NetArpWaitTxPacket; 738 pkt += NetSetEther(pkt, mac, PROT_IP); 739 740 ip = (volatile IP_t *)pkt; 741 742 /* 743 * Construct an IP and ICMP header. 744 * (need to set no fragment bit - XXX) 745 */ 746 /* IP_HDR_SIZE / 4 (not including UDP) */ 747 ip->ip_hl_v = 0x45; 748 ip->ip_tos = 0; 749 ip->ip_len = htons(IP_HDR_SIZE_NO_UDP + 8); 750 ip->ip_id = htons(NetIPID++); 751 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ 752 ip->ip_ttl = 255; 753 ip->ip_p = 0x01; /* ICMP */ 754 ip->ip_sum = 0; 755 /* already in network byte order */ 756 NetCopyIP((void *)&ip->ip_src, &NetOurIP); 757 /* - "" - */ 758 NetCopyIP((void *)&ip->ip_dst, &NetPingIP); 759 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2); 760 761 s = &ip->udp_src; /* XXX ICMP starts here */ 762 s[0] = htons(0x0800); /* echo-request, code */ 763 s[1] = 0; /* checksum */ 764 s[2] = 0; /* identifier */ 765 s[3] = htons(PingSeqNo++); /* sequence number */ 766 s[1] = ~NetCksum((uchar *)s, 8/2); 767 768 /* size of the waiting packet */ 769 NetArpWaitTxPacketSize = 770 (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8; 771 772 /* and do the ARP request */ 773 NetArpWaitTry = 1; 774 NetArpWaitTimerStart = get_timer(0); 775 ArpRequest(); 776 return 1; /* waiting */ 777 } 778 779 static void 780 PingTimeout(void) 781 { 782 eth_halt(); 783 NetState = NETLOOP_FAIL; /* we did not get the reply */ 784 } 785 786 static void 787 PingHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 788 unsigned len) 789 { 790 if (sip != NetPingIP) 791 return; 792 793 NetState = NETLOOP_SUCCESS; 794 } 795 796 static void PingStart(void) 797 { 798 printf("Using %s device\n", eth_get_name()); 799 NetSetTimeout(10000UL, PingTimeout); 800 NetSetHandler(PingHandler); 801 802 PingSend(); 803 } 804 #endif 805 806 #if defined(CONFIG_CMD_CDP) 807 808 #define CDP_DEVICE_ID_TLV 0x0001 809 #define CDP_ADDRESS_TLV 0x0002 810 #define CDP_PORT_ID_TLV 0x0003 811 #define CDP_CAPABILITIES_TLV 0x0004 812 #define CDP_VERSION_TLV 0x0005 813 #define CDP_PLATFORM_TLV 0x0006 814 #define CDP_NATIVE_VLAN_TLV 0x000a 815 #define CDP_APPLIANCE_VLAN_TLV 0x000e 816 #define CDP_TRIGGER_TLV 0x000f 817 #define CDP_POWER_CONSUMPTION_TLV 0x0010 818 #define CDP_SYSNAME_TLV 0x0014 819 #define CDP_SYSOBJECT_TLV 0x0015 820 #define CDP_MANAGEMENT_ADDRESS_TLV 0x0016 821 822 #define CDP_TIMEOUT 250UL /* one packet every 250ms */ 823 824 static int CDPSeq; 825 static int CDPOK; 826 827 ushort CDPNativeVLAN; 828 ushort CDPApplianceVLAN; 829 830 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 831 0x00 }; 832 833 static ushort CDP_compute_csum(const uchar *buff, ushort len) 834 { 835 ushort csum; 836 int odd; 837 ulong result = 0; 838 ushort leftover; 839 ushort *p; 840 841 if (len > 0) { 842 odd = 1 & (ulong)buff; 843 if (odd) { 844 result = *buff << 8; 845 len--; 846 buff++; 847 } 848 while (len > 1) { 849 p = (ushort *)buff; 850 result += *p++; 851 buff = (uchar *)p; 852 if (result & 0x80000000) 853 result = (result & 0xFFFF) + (result >> 16); 854 len -= 2; 855 } 856 if (len) { 857 leftover = (signed short)(*(const signed char *)buff); 858 /* CISCO SUCKS big time! (and blows too): 859 * CDP uses the IP checksum algorithm with a twist; 860 * for the last byte it *sign* extends and sums. 861 */ 862 result = (result & 0xffff0000) | 863 ((result + leftover) & 0x0000ffff); 864 } 865 while (result >> 16) 866 result = (result & 0xFFFF) + (result >> 16); 867 868 if (odd) 869 result = ((result >> 8) & 0xff) | 870 ((result & 0xff) << 8); 871 } 872 873 /* add up 16-bit and 17-bit words for 17+c bits */ 874 result = (result & 0xffff) + (result >> 16); 875 /* add up 16-bit and 2-bit for 16+c bit */ 876 result = (result & 0xffff) + (result >> 16); 877 /* add up carry.. */ 878 result = (result & 0xffff) + (result >> 16); 879 880 /* negate */ 881 csum = ~(ushort)result; 882 883 /* run time endian detection */ 884 if (csum != htons(csum)) /* little endian */ 885 csum = htons(csum); 886 887 return csum; 888 } 889 890 int CDPSendTrigger(void) 891 { 892 volatile uchar *pkt; 893 volatile ushort *s; 894 volatile ushort *cp; 895 Ethernet_t *et; 896 int len; 897 ushort chksum; 898 #if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID) || \ 899 defined(CONFIG_CDP_VERSION) || defined(CONFIG_CDP_PLATFORM) 900 char buf[32]; 901 #endif 902 903 pkt = NetTxPacket; 904 et = (Ethernet_t *)pkt; 905 906 /* NOTE: trigger sent not on any VLAN */ 907 908 /* form ethernet header */ 909 memcpy(et->et_dest, NetCDPAddr, 6); 910 memcpy(et->et_src, NetOurEther, 6); 911 912 pkt += ETHER_HDR_SIZE; 913 914 /* SNAP header */ 915 memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)); 916 pkt += sizeof(CDP_SNAP_hdr); 917 918 /* CDP header */ 919 *pkt++ = 0x02; /* CDP version 2 */ 920 *pkt++ = 180; /* TTL */ 921 s = (volatile ushort *)pkt; 922 cp = s; 923 /* checksum (0 for later calculation) */ 924 *s++ = htons(0); 925 926 /* CDP fields */ 927 #ifdef CONFIG_CDP_DEVICE_ID 928 *s++ = htons(CDP_DEVICE_ID_TLV); 929 *s++ = htons(CONFIG_CDP_DEVICE_ID); 930 sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%pm", NetOurEther); 931 memcpy((uchar *)s, buf, 16); 932 s += 16 / 2; 933 #endif 934 935 #ifdef CONFIG_CDP_PORT_ID 936 *s++ = htons(CDP_PORT_ID_TLV); 937 memset(buf, 0, sizeof(buf)); 938 sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index()); 939 len = strlen(buf); 940 if (len & 1) /* make it even */ 941 len++; 942 *s++ = htons(len + 4); 943 memcpy((uchar *)s, buf, len); 944 s += len / 2; 945 #endif 946 947 #ifdef CONFIG_CDP_CAPABILITIES 948 *s++ = htons(CDP_CAPABILITIES_TLV); 949 *s++ = htons(8); 950 *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES); 951 s += 2; 952 #endif 953 954 #ifdef CONFIG_CDP_VERSION 955 *s++ = htons(CDP_VERSION_TLV); 956 memset(buf, 0, sizeof(buf)); 957 strcpy(buf, CONFIG_CDP_VERSION); 958 len = strlen(buf); 959 if (len & 1) /* make it even */ 960 len++; 961 *s++ = htons(len + 4); 962 memcpy((uchar *)s, buf, len); 963 s += len / 2; 964 #endif 965 966 #ifdef CONFIG_CDP_PLATFORM 967 *s++ = htons(CDP_PLATFORM_TLV); 968 memset(buf, 0, sizeof(buf)); 969 strcpy(buf, CONFIG_CDP_PLATFORM); 970 len = strlen(buf); 971 if (len & 1) /* make it even */ 972 len++; 973 *s++ = htons(len + 4); 974 memcpy((uchar *)s, buf, len); 975 s += len / 2; 976 #endif 977 978 #ifdef CONFIG_CDP_TRIGGER 979 *s++ = htons(CDP_TRIGGER_TLV); 980 *s++ = htons(8); 981 *(ulong *)s = htonl(CONFIG_CDP_TRIGGER); 982 s += 2; 983 #endif 984 985 #ifdef CONFIG_CDP_POWER_CONSUMPTION 986 *s++ = htons(CDP_POWER_CONSUMPTION_TLV); 987 *s++ = htons(6); 988 *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION); 989 #endif 990 991 /* length of ethernet packet */ 992 len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE); 993 et->et_protlen = htons(len); 994 995 len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr); 996 chksum = CDP_compute_csum((uchar *)NetTxPacket + len, 997 (uchar *)s - (NetTxPacket + len)); 998 if (chksum == 0) 999 chksum = 0xFFFF; 1000 *cp = htons(chksum); 1001 1002 (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket); 1003 return 0; 1004 } 1005 1006 static void 1007 CDPTimeout(void) 1008 { 1009 CDPSeq++; 1010 1011 if (CDPSeq < 3) { 1012 NetSetTimeout(CDP_TIMEOUT, CDPTimeout); 1013 CDPSendTrigger(); 1014 return; 1015 } 1016 1017 /* if not OK try again */ 1018 if (!CDPOK) 1019 NetStartAgain(); 1020 else 1021 NetState = NETLOOP_SUCCESS; 1022 } 1023 1024 static void 1025 CDPDummyHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 1026 unsigned len) 1027 { 1028 /* nothing */ 1029 } 1030 1031 static void 1032 CDPHandler(const uchar *pkt, unsigned len) 1033 { 1034 const uchar *t; 1035 const ushort *ss; 1036 ushort type, tlen; 1037 uchar applid; 1038 ushort vlan, nvlan; 1039 1040 /* minimum size? */ 1041 if (len < sizeof(CDP_SNAP_hdr) + 4) 1042 goto pkt_short; 1043 1044 /* check for valid CDP SNAP header */ 1045 if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0) 1046 return; 1047 1048 pkt += sizeof(CDP_SNAP_hdr); 1049 len -= sizeof(CDP_SNAP_hdr); 1050 1051 /* Version of CDP protocol must be >= 2 and TTL != 0 */ 1052 if (pkt[0] < 0x02 || pkt[1] == 0) 1053 return; 1054 1055 /* 1056 * if version is greater than 0x02 maybe we'll have a problem; 1057 * output a warning 1058 */ 1059 if (pkt[0] != 0x02) 1060 printf("** WARNING: CDP packet received with a protocol version %d > 2\n", 1061 pkt[0] & 0xff); 1062 1063 if (CDP_compute_csum(pkt, len) != 0) 1064 return; 1065 1066 pkt += 4; 1067 len -= 4; 1068 1069 vlan = htons(-1); 1070 nvlan = htons(-1); 1071 while (len > 0) { 1072 if (len < 4) 1073 goto pkt_short; 1074 1075 ss = (const ushort *)pkt; 1076 type = ntohs(ss[0]); 1077 tlen = ntohs(ss[1]); 1078 if (tlen > len) 1079 goto pkt_short; 1080 1081 pkt += tlen; 1082 len -= tlen; 1083 1084 ss += 2; /* point ss to the data of the TLV */ 1085 tlen -= 4; 1086 1087 switch (type) { 1088 case CDP_DEVICE_ID_TLV: 1089 break; 1090 case CDP_ADDRESS_TLV: 1091 break; 1092 case CDP_PORT_ID_TLV: 1093 break; 1094 case CDP_CAPABILITIES_TLV: 1095 break; 1096 case CDP_VERSION_TLV: 1097 break; 1098 case CDP_PLATFORM_TLV: 1099 break; 1100 case CDP_NATIVE_VLAN_TLV: 1101 nvlan = *ss; 1102 break; 1103 case CDP_APPLIANCE_VLAN_TLV: 1104 t = (const uchar *)ss; 1105 while (tlen > 0) { 1106 if (tlen < 3) 1107 goto pkt_short; 1108 1109 applid = t[0]; 1110 ss = (const ushort *)(t + 1); 1111 1112 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE 1113 if (applid == CONFIG_CDP_APPLIANCE_VLAN_TYPE) 1114 vlan = *ss; 1115 #else 1116 /* XXX will this work; dunno */ 1117 vlan = ntohs(*ss); 1118 #endif 1119 t += 3; tlen -= 3; 1120 } 1121 break; 1122 case CDP_TRIGGER_TLV: 1123 break; 1124 case CDP_POWER_CONSUMPTION_TLV: 1125 break; 1126 case CDP_SYSNAME_TLV: 1127 break; 1128 case CDP_SYSOBJECT_TLV: 1129 break; 1130 case CDP_MANAGEMENT_ADDRESS_TLV: 1131 break; 1132 } 1133 } 1134 1135 CDPApplianceVLAN = vlan; 1136 CDPNativeVLAN = nvlan; 1137 1138 CDPOK = 1; 1139 return; 1140 1141 pkt_short: 1142 printf("** CDP packet is too short\n"); 1143 return; 1144 } 1145 1146 static void CDPStart(void) 1147 { 1148 printf("Using %s device\n", eth_get_name()); 1149 CDPSeq = 0; 1150 CDPOK = 0; 1151 1152 CDPNativeVLAN = htons(-1); 1153 CDPApplianceVLAN = htons(-1); 1154 1155 NetSetTimeout(CDP_TIMEOUT, CDPTimeout); 1156 NetSetHandler(CDPDummyHandler); 1157 1158 CDPSendTrigger(); 1159 } 1160 #endif 1161 1162 #ifdef CONFIG_IP_DEFRAG 1163 /* 1164 * This function collects fragments in a single packet, according 1165 * to the algorithm in RFC815. It returns NULL or the pointer to 1166 * a complete packet, in static storage 1167 */ 1168 #ifndef CONFIG_NET_MAXDEFRAG 1169 #define CONFIG_NET_MAXDEFRAG 16384 1170 #endif 1171 /* 1172 * MAXDEFRAG, above, is chosen in the config file and is real data 1173 * so we need to add the NFS overhead, which is more than TFTP. 1174 * To use sizeof in the internal unnamed structures, we need a real 1175 * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately). 1176 * The compiler doesn't complain nor allocates the actual structure 1177 */ 1178 static struct rpc_t rpc_specimen; 1179 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply)) 1180 1181 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE_NO_UDP) 1182 1183 /* 1184 * this is the packet being assembled, either data or frag control. 1185 * Fragments go by 8 bytes, so this union must be 8 bytes long 1186 */ 1187 struct hole { 1188 /* first_byte is address of this structure */ 1189 u16 last_byte; /* last byte in this hole + 1 (begin of next hole) */ 1190 u16 next_hole; /* index of next (in 8-b blocks), 0 == none */ 1191 u16 prev_hole; /* index of prev, 0 == none */ 1192 u16 unused; 1193 }; 1194 1195 static IP_t *__NetDefragment(IP_t *ip, int *lenp) 1196 { 1197 static uchar pkt_buff[IP_PKTSIZE] __attribute__((aligned(PKTALIGN))); 1198 static u16 first_hole, total_len; 1199 struct hole *payload, *thisfrag, *h, *newh; 1200 IP_t *localip = (IP_t *)pkt_buff; 1201 uchar *indata = (uchar *)ip; 1202 int offset8, start, len, done = 0; 1203 u16 ip_off = ntohs(ip->ip_off); 1204 1205 /* payload starts after IP header, this fragment is in there */ 1206 payload = (struct hole *)(pkt_buff + IP_HDR_SIZE_NO_UDP); 1207 offset8 = (ip_off & IP_OFFS); 1208 thisfrag = payload + offset8; 1209 start = offset8 * 8; 1210 len = ntohs(ip->ip_len) - IP_HDR_SIZE_NO_UDP; 1211 1212 if (start + len > IP_MAXUDP) /* fragment extends too far */ 1213 return NULL; 1214 1215 if (!total_len || localip->ip_id != ip->ip_id) { 1216 /* new (or different) packet, reset structs */ 1217 total_len = 0xffff; 1218 payload[0].last_byte = ~0; 1219 payload[0].next_hole = 0; 1220 payload[0].prev_hole = 0; 1221 first_hole = 0; 1222 /* any IP header will work, copy the first we received */ 1223 memcpy(localip, ip, IP_HDR_SIZE_NO_UDP); 1224 } 1225 1226 /* 1227 * What follows is the reassembly algorithm. We use the payload 1228 * array as a linked list of hole descriptors, as each hole starts 1229 * at a multiple of 8 bytes. However, last byte can be whatever value, 1230 * so it is represented as byte count, not as 8-byte blocks. 1231 */ 1232 1233 h = payload + first_hole; 1234 while (h->last_byte < start) { 1235 if (!h->next_hole) { 1236 /* no hole that far away */ 1237 return NULL; 1238 } 1239 h = payload + h->next_hole; 1240 } 1241 1242 /* last fragment may be 1..7 bytes, the "+7" forces acceptance */ 1243 if (offset8 + ((len + 7) / 8) <= h - payload) { 1244 /* no overlap with holes (dup fragment?) */ 1245 return NULL; 1246 } 1247 1248 if (!(ip_off & IP_FLAGS_MFRAG)) { 1249 /* no more fragmentss: truncate this (last) hole */ 1250 total_len = start + len; 1251 h->last_byte = start + len; 1252 } 1253 1254 /* 1255 * There is some overlap: fix the hole list. This code doesn't 1256 * deal with a fragment that overlaps with two different holes 1257 * (thus being a superset of a previously-received fragment). 1258 */ 1259 1260 if ((h >= thisfrag) && (h->last_byte <= start + len)) { 1261 /* complete overlap with hole: remove hole */ 1262 if (!h->prev_hole && !h->next_hole) { 1263 /* last remaining hole */ 1264 done = 1; 1265 } else if (!h->prev_hole) { 1266 /* first hole */ 1267 first_hole = h->next_hole; 1268 payload[h->next_hole].prev_hole = 0; 1269 } else if (!h->next_hole) { 1270 /* last hole */ 1271 payload[h->prev_hole].next_hole = 0; 1272 } else { 1273 /* in the middle of the list */ 1274 payload[h->next_hole].prev_hole = h->prev_hole; 1275 payload[h->prev_hole].next_hole = h->next_hole; 1276 } 1277 1278 } else if (h->last_byte <= start + len) { 1279 /* overlaps with final part of the hole: shorten this hole */ 1280 h->last_byte = start; 1281 1282 } else if (h >= thisfrag) { 1283 /* overlaps with initial part of the hole: move this hole */ 1284 newh = thisfrag + (len / 8); 1285 *newh = *h; 1286 h = newh; 1287 if (h->next_hole) 1288 payload[h->next_hole].prev_hole = (h - payload); 1289 if (h->prev_hole) 1290 payload[h->prev_hole].next_hole = (h - payload); 1291 else 1292 first_hole = (h - payload); 1293 1294 } else { 1295 /* fragment sits in the middle: split the hole */ 1296 newh = thisfrag + (len / 8); 1297 *newh = *h; 1298 h->last_byte = start; 1299 h->next_hole = (newh - payload); 1300 newh->prev_hole = (h - payload); 1301 if (newh->next_hole) 1302 payload[newh->next_hole].prev_hole = (newh - payload); 1303 } 1304 1305 /* finally copy this fragment and possibly return whole packet */ 1306 memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE_NO_UDP, len); 1307 if (!done) 1308 return NULL; 1309 1310 localip->ip_len = htons(total_len); 1311 *lenp = total_len + IP_HDR_SIZE_NO_UDP; 1312 return localip; 1313 } 1314 1315 static inline IP_t *NetDefragment(IP_t *ip, int *lenp) 1316 { 1317 u16 ip_off = ntohs(ip->ip_off); 1318 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) 1319 return ip; /* not a fragment */ 1320 return __NetDefragment(ip, lenp); 1321 } 1322 1323 #else /* !CONFIG_IP_DEFRAG */ 1324 1325 static inline IP_t *NetDefragment(IP_t *ip, int *lenp) 1326 { 1327 u16 ip_off = ntohs(ip->ip_off); 1328 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) 1329 return ip; /* not a fragment */ 1330 return NULL; 1331 } 1332 #endif 1333 1334 void 1335 NetReceive(volatile uchar *inpkt, int len) 1336 { 1337 Ethernet_t *et; 1338 IP_t *ip; 1339 ARP_t *arp; 1340 IPaddr_t tmp; 1341 IPaddr_t src_ip; 1342 int x; 1343 uchar *pkt; 1344 #if defined(CONFIG_CMD_CDP) 1345 int iscdp; 1346 #endif 1347 ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid; 1348 1349 debug("packet received\n"); 1350 1351 NetRxPacket = inpkt; 1352 NetRxPacketLen = len; 1353 et = (Ethernet_t *)inpkt; 1354 1355 /* too small packet? */ 1356 if (len < ETHER_HDR_SIZE) 1357 return; 1358 1359 #ifdef CONFIG_API 1360 if (push_packet) { 1361 (*push_packet)(inpkt, len); 1362 return; 1363 } 1364 #endif 1365 1366 #if defined(CONFIG_CMD_CDP) 1367 /* keep track if packet is CDP */ 1368 iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0; 1369 #endif 1370 1371 myvlanid = ntohs(NetOurVLAN); 1372 if (myvlanid == (ushort)-1) 1373 myvlanid = VLAN_NONE; 1374 mynvlanid = ntohs(NetOurNativeVLAN); 1375 if (mynvlanid == (ushort)-1) 1376 mynvlanid = VLAN_NONE; 1377 1378 x = ntohs(et->et_protlen); 1379 1380 debug("packet received\n"); 1381 1382 if (x < 1514) { 1383 /* 1384 * Got a 802 packet. Check the other protocol field. 1385 */ 1386 x = ntohs(et->et_prot); 1387 1388 ip = (IP_t *)(inpkt + E802_HDR_SIZE); 1389 len -= E802_HDR_SIZE; 1390 1391 } else if (x != PROT_VLAN) { /* normal packet */ 1392 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE); 1393 len -= ETHER_HDR_SIZE; 1394 1395 } else { /* VLAN packet */ 1396 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et; 1397 1398 debug("VLAN packet received\n"); 1399 1400 /* too small packet? */ 1401 if (len < VLAN_ETHER_HDR_SIZE) 1402 return; 1403 1404 /* if no VLAN active */ 1405 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE 1406 #if defined(CONFIG_CMD_CDP) 1407 && iscdp == 0 1408 #endif 1409 ) 1410 return; 1411 1412 cti = ntohs(vet->vet_tag); 1413 vlanid = cti & VLAN_IDMASK; 1414 x = ntohs(vet->vet_type); 1415 1416 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE); 1417 len -= VLAN_ETHER_HDR_SIZE; 1418 } 1419 1420 debug("Receive from protocol 0x%x\n", x); 1421 1422 #if defined(CONFIG_CMD_CDP) 1423 if (iscdp) { 1424 CDPHandler((uchar *)ip, len); 1425 return; 1426 } 1427 #endif 1428 1429 if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) { 1430 if (vlanid == VLAN_NONE) 1431 vlanid = (mynvlanid & VLAN_IDMASK); 1432 /* not matched? */ 1433 if (vlanid != (myvlanid & VLAN_IDMASK)) 1434 return; 1435 } 1436 1437 switch (x) { 1438 1439 case PROT_ARP: 1440 /* 1441 * We have to deal with two types of ARP packets: 1442 * - REQUEST packets will be answered by sending our 1443 * IP address - if we know it. 1444 * - REPLY packates are expected only after we asked 1445 * for the TFTP server's or the gateway's ethernet 1446 * address; so if we receive such a packet, we set 1447 * the server ethernet address 1448 */ 1449 debug("Got ARP\n"); 1450 1451 arp = (ARP_t *)ip; 1452 if (len < ARP_HDR_SIZE) { 1453 printf("bad length %d < %d\n", len, ARP_HDR_SIZE); 1454 return; 1455 } 1456 if (ntohs(arp->ar_hrd) != ARP_ETHER) 1457 return; 1458 if (ntohs(arp->ar_pro) != PROT_IP) 1459 return; 1460 if (arp->ar_hln != 6) 1461 return; 1462 if (arp->ar_pln != 4) 1463 return; 1464 1465 if (NetOurIP == 0) 1466 return; 1467 1468 if (NetReadIP(&arp->ar_data[16]) != NetOurIP) 1469 return; 1470 1471 switch (ntohs(arp->ar_op)) { 1472 case ARPOP_REQUEST: 1473 /* reply with our IP address */ 1474 debug("Got ARP REQUEST, return our IP\n"); 1475 pkt = (uchar *)et; 1476 pkt += NetSetEther(pkt, et->et_src, PROT_ARP); 1477 arp->ar_op = htons(ARPOP_REPLY); 1478 memcpy(&arp->ar_data[10], &arp->ar_data[0], 6); 1479 NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]); 1480 memcpy(&arp->ar_data[0], NetOurEther, 6); 1481 NetCopyIP(&arp->ar_data[6], &NetOurIP); 1482 (void) eth_send((uchar *)et, 1483 (pkt - (uchar *)et) + ARP_HDR_SIZE); 1484 return; 1485 1486 case ARPOP_REPLY: /* arp reply */ 1487 /* are we waiting for a reply */ 1488 if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC) 1489 break; 1490 1491 #ifdef CONFIG_KEEP_SERVERADDR 1492 if (NetServerIP == NetArpWaitPacketIP) { 1493 char buf[20]; 1494 sprintf(buf, "%pM", arp->ar_data); 1495 setenv("serveraddr", buf); 1496 } 1497 #endif 1498 1499 debug("Got ARP REPLY, set server/gtwy eth addr (%pM)\n", 1500 arp->ar_data); 1501 1502 tmp = NetReadIP(&arp->ar_data[6]); 1503 1504 /* matched waiting packet's address */ 1505 if (tmp == NetArpWaitReplyIP) { 1506 debug("Got it\n"); 1507 /* save address for later use */ 1508 memcpy(NetArpWaitPacketMAC, 1509 &arp->ar_data[0], 6); 1510 1511 #ifdef CONFIG_NETCONSOLE 1512 (*packetHandler)(0, 0, 0, 0, 0); 1513 #endif 1514 /* modify header, and transmit it */ 1515 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6); 1516 (void) eth_send(NetArpWaitTxPacket, 1517 NetArpWaitTxPacketSize); 1518 1519 /* no arp request pending now */ 1520 NetArpWaitPacketIP = 0; 1521 NetArpWaitTxPacketSize = 0; 1522 NetArpWaitPacketMAC = NULL; 1523 1524 } 1525 return; 1526 default: 1527 debug("Unexpected ARP opcode 0x%x\n", 1528 ntohs(arp->ar_op)); 1529 return; 1530 } 1531 break; 1532 1533 #ifdef CONFIG_CMD_RARP 1534 case PROT_RARP: 1535 debug("Got RARP\n"); 1536 arp = (ARP_t *)ip; 1537 if (len < ARP_HDR_SIZE) { 1538 printf("bad length %d < %d\n", len, ARP_HDR_SIZE); 1539 return; 1540 } 1541 1542 if ((ntohs(arp->ar_op) != RARPOP_REPLY) || 1543 (ntohs(arp->ar_hrd) != ARP_ETHER) || 1544 (ntohs(arp->ar_pro) != PROT_IP) || 1545 (arp->ar_hln != 6) || (arp->ar_pln != 4)) { 1546 1547 puts("invalid RARP header\n"); 1548 } else { 1549 NetCopyIP(&NetOurIP, &arp->ar_data[16]); 1550 if (NetServerIP == 0) 1551 NetCopyIP(&NetServerIP, &arp->ar_data[6]); 1552 memcpy(NetServerEther, &arp->ar_data[0], 6); 1553 1554 (*packetHandler)(0, 0, 0, 0, 0); 1555 } 1556 break; 1557 #endif 1558 case PROT_IP: 1559 debug("Got IP\n"); 1560 /* Before we start poking the header, make sure it is there */ 1561 if (len < IP_HDR_SIZE) { 1562 debug("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE); 1563 return; 1564 } 1565 /* Check the packet length */ 1566 if (len < ntohs(ip->ip_len)) { 1567 printf("len bad %d < %d\n", len, ntohs(ip->ip_len)); 1568 return; 1569 } 1570 len = ntohs(ip->ip_len); 1571 debug("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff); 1572 1573 /* Can't deal with anything except IPv4 */ 1574 if ((ip->ip_hl_v & 0xf0) != 0x40) 1575 return; 1576 /* Can't deal with IP options (headers != 20 bytes) */ 1577 if ((ip->ip_hl_v & 0x0f) > 0x05) 1578 return; 1579 /* Check the Checksum of the header */ 1580 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) { 1581 puts("checksum bad\n"); 1582 return; 1583 } 1584 /* If it is not for us, ignore it */ 1585 tmp = NetReadIP(&ip->ip_dst); 1586 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) { 1587 #ifdef CONFIG_MCAST_TFTP 1588 if (Mcast_addr != tmp) 1589 #endif 1590 return; 1591 } 1592 /* Read source IP address for later use */ 1593 src_ip = NetReadIP(&ip->ip_src); 1594 /* 1595 * The function returns the unchanged packet if it's not 1596 * a fragment, and either the complete packet or NULL if 1597 * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL) 1598 */ 1599 ip = NetDefragment(ip, &len); 1600 if (!ip) 1601 return; 1602 /* 1603 * watch for ICMP host redirects 1604 * 1605 * There is no real handler code (yet). We just watch 1606 * for ICMP host redirect messages. In case anybody 1607 * sees these messages: please contact me 1608 * (wd@denx.de), or - even better - send me the 1609 * necessary fixes :-) 1610 * 1611 * Note: in all cases where I have seen this so far 1612 * it was a problem with the router configuration, 1613 * for instance when a router was configured in the 1614 * BOOTP reply, but the TFTP server was on the same 1615 * subnet. So this is probably a warning that your 1616 * configuration might be wrong. But I'm not really 1617 * sure if there aren't any other situations. 1618 */ 1619 if (ip->ip_p == IPPROTO_ICMP) { 1620 ICMP_t *icmph = (ICMP_t *)&(ip->udp_src); 1621 1622 switch (icmph->type) { 1623 case ICMP_REDIRECT: 1624 if (icmph->code != ICMP_REDIR_HOST) 1625 return; 1626 printf(" ICMP Host Redirect to %pI4 ", 1627 &icmph->un.gateway); 1628 return; 1629 #if defined(CONFIG_CMD_PING) 1630 case ICMP_ECHO_REPLY: 1631 /* 1632 * IP header OK. Pass the packet to the 1633 * current handler. 1634 */ 1635 /* XXX point to ip packet */ 1636 (*packetHandler)((uchar *)ip, 0, src_ip, 0, 0); 1637 return; 1638 case ICMP_ECHO_REQUEST: 1639 debug("Got ICMP ECHO REQUEST, return %d bytes\n", 1640 ETHER_HDR_SIZE + len); 1641 1642 memcpy(&et->et_dest[0], &et->et_src[0], 6); 1643 memcpy(&et->et_src[0], NetOurEther, 6); 1644 1645 ip->ip_sum = 0; 1646 ip->ip_off = 0; 1647 NetCopyIP((void *)&ip->ip_dst, &ip->ip_src); 1648 NetCopyIP((void *)&ip->ip_src, &NetOurIP); 1649 ip->ip_sum = ~NetCksum((uchar *)ip, 1650 IP_HDR_SIZE_NO_UDP >> 1); 1651 1652 icmph->type = ICMP_ECHO_REPLY; 1653 icmph->checksum = 0; 1654 icmph->checksum = ~NetCksum((uchar *)icmph, 1655 (len - IP_HDR_SIZE_NO_UDP) >> 1); 1656 (void) eth_send((uchar *)et, 1657 ETHER_HDR_SIZE + len); 1658 return; 1659 #endif 1660 default: 1661 return; 1662 } 1663 } else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */ 1664 return; 1665 } 1666 1667 #ifdef CONFIG_UDP_CHECKSUM 1668 if (ip->udp_xsum != 0) { 1669 ulong xsum; 1670 ushort *sumptr; 1671 ushort sumlen; 1672 1673 xsum = ip->ip_p; 1674 xsum += (ntohs(ip->udp_len)); 1675 xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff; 1676 xsum += (ntohl(ip->ip_src) >> 0) & 0x0000ffff; 1677 xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff; 1678 xsum += (ntohl(ip->ip_dst) >> 0) & 0x0000ffff; 1679 1680 sumlen = ntohs(ip->udp_len); 1681 sumptr = (ushort *) &(ip->udp_src); 1682 1683 while (sumlen > 1) { 1684 ushort sumdata; 1685 1686 sumdata = *sumptr++; 1687 xsum += ntohs(sumdata); 1688 sumlen -= 2; 1689 } 1690 if (sumlen > 0) { 1691 ushort sumdata; 1692 1693 sumdata = *(unsigned char *) sumptr; 1694 sumdata = (sumdata << 8) & 0xff00; 1695 xsum += sumdata; 1696 } 1697 while ((xsum >> 16) != 0) { 1698 xsum = (xsum & 0x0000ffff) + 1699 ((xsum >> 16) & 0x0000ffff); 1700 } 1701 if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) { 1702 printf(" UDP wrong checksum %08lx %08x\n", 1703 xsum, ntohs(ip->udp_xsum)); 1704 return; 1705 } 1706 } 1707 #endif 1708 1709 1710 #ifdef CONFIG_NETCONSOLE 1711 nc_input_packet((uchar *)ip + IP_HDR_SIZE, 1712 ntohs(ip->udp_dst), 1713 ntohs(ip->udp_src), 1714 ntohs(ip->udp_len) - 8); 1715 #endif 1716 /* 1717 * IP header OK. Pass the packet to the current handler. 1718 */ 1719 (*packetHandler)((uchar *)ip + IP_HDR_SIZE, 1720 ntohs(ip->udp_dst), 1721 src_ip, 1722 ntohs(ip->udp_src), 1723 ntohs(ip->udp_len) - 8); 1724 break; 1725 } 1726 } 1727 1728 1729 /**********************************************************************/ 1730 1731 static int net_check_prereq(proto_t protocol) 1732 { 1733 switch (protocol) { 1734 /* Fall through */ 1735 #if defined(CONFIG_CMD_PING) 1736 case PING: 1737 if (NetPingIP == 0) { 1738 puts("*** ERROR: ping address not given\n"); 1739 return 1; 1740 } 1741 goto common; 1742 #endif 1743 #if defined(CONFIG_CMD_SNTP) 1744 case SNTP: 1745 if (NetNtpServerIP == 0) { 1746 puts("*** ERROR: NTP server address not given\n"); 1747 return 1; 1748 } 1749 goto common; 1750 #endif 1751 #if defined(CONFIG_CMD_DNS) 1752 case DNS: 1753 if (NetOurDNSIP == 0) { 1754 puts("*** ERROR: DNS server address not given\n"); 1755 return 1; 1756 } 1757 goto common; 1758 #endif 1759 #if defined(CONFIG_CMD_NFS) 1760 case NFS: 1761 #endif 1762 case TFTP: 1763 if (NetServerIP == 0) { 1764 puts("*** ERROR: `serverip' not set\n"); 1765 return 1; 1766 } 1767 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \ 1768 defined(CONFIG_CMD_DNS) 1769 common: 1770 #endif 1771 /* Fall through */ 1772 1773 case NETCONS: 1774 case TFTPSRV: 1775 if (NetOurIP == 0) { 1776 puts("*** ERROR: `ipaddr' not set\n"); 1777 return 1; 1778 } 1779 /* Fall through */ 1780 1781 #ifdef CONFIG_CMD_RARP 1782 case RARP: 1783 #endif 1784 case BOOTP: 1785 case CDP: 1786 case DHCP: 1787 if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) { 1788 extern int eth_get_dev_index(void); 1789 int num = eth_get_dev_index(); 1790 1791 switch (num) { 1792 case -1: 1793 puts("*** ERROR: No ethernet found.\n"); 1794 return 1; 1795 case 0: 1796 puts("*** ERROR: `ethaddr' not set\n"); 1797 break; 1798 default: 1799 printf("*** ERROR: `eth%daddr' not set\n", 1800 num); 1801 break; 1802 } 1803 1804 NetStartAgain(); 1805 return 2; 1806 } 1807 /* Fall through */ 1808 default: 1809 return 0; 1810 } 1811 return 0; /* OK */ 1812 } 1813 /**********************************************************************/ 1814 1815 int 1816 NetCksumOk(uchar *ptr, int len) 1817 { 1818 return !((NetCksum(ptr, len) + 1) & 0xfffe); 1819 } 1820 1821 1822 unsigned 1823 NetCksum(uchar *ptr, int len) 1824 { 1825 ulong xsum; 1826 ushort *p = (ushort *)ptr; 1827 1828 xsum = 0; 1829 while (len-- > 0) 1830 xsum += *p++; 1831 xsum = (xsum & 0xffff) + (xsum >> 16); 1832 xsum = (xsum & 0xffff) + (xsum >> 16); 1833 return xsum & 0xffff; 1834 } 1835 1836 int 1837 NetEthHdrSize(void) 1838 { 1839 ushort myvlanid; 1840 1841 myvlanid = ntohs(NetOurVLAN); 1842 if (myvlanid == (ushort)-1) 1843 myvlanid = VLAN_NONE; 1844 1845 return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : 1846 VLAN_ETHER_HDR_SIZE; 1847 } 1848 1849 int 1850 NetSetEther(volatile uchar *xet, uchar * addr, uint prot) 1851 { 1852 Ethernet_t *et = (Ethernet_t *)xet; 1853 ushort myvlanid; 1854 1855 myvlanid = ntohs(NetOurVLAN); 1856 if (myvlanid == (ushort)-1) 1857 myvlanid = VLAN_NONE; 1858 1859 memcpy(et->et_dest, addr, 6); 1860 memcpy(et->et_src, NetOurEther, 6); 1861 if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) { 1862 et->et_protlen = htons(prot); 1863 return ETHER_HDR_SIZE; 1864 } else { 1865 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet; 1866 1867 vet->vet_vlan_type = htons(PROT_VLAN); 1868 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK)); 1869 vet->vet_type = htons(prot); 1870 return VLAN_ETHER_HDR_SIZE; 1871 } 1872 } 1873 1874 void 1875 NetSetIP(volatile uchar *xip, IPaddr_t dest, int dport, int sport, int len) 1876 { 1877 IP_t *ip = (IP_t *)xip; 1878 1879 /* 1880 * If the data is an odd number of bytes, zero the 1881 * byte after the last byte so that the checksum 1882 * will work. 1883 */ 1884 if (len & 1) 1885 xip[IP_HDR_SIZE + len] = 0; 1886 1887 /* 1888 * Construct an IP and UDP header. 1889 * (need to set no fragment bit - XXX) 1890 */ 1891 /* IP_HDR_SIZE / 4 (not including UDP) */ 1892 ip->ip_hl_v = 0x45; 1893 ip->ip_tos = 0; 1894 ip->ip_len = htons(IP_HDR_SIZE + len); 1895 ip->ip_id = htons(NetIPID++); 1896 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ 1897 ip->ip_ttl = 255; 1898 ip->ip_p = 17; /* UDP */ 1899 ip->ip_sum = 0; 1900 /* already in network byte order */ 1901 NetCopyIP((void *)&ip->ip_src, &NetOurIP); 1902 /* - "" - */ 1903 NetCopyIP((void *)&ip->ip_dst, &dest); 1904 ip->udp_src = htons(sport); 1905 ip->udp_dst = htons(dport); 1906 ip->udp_len = htons(8 + len); 1907 ip->udp_xsum = 0; 1908 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2); 1909 } 1910 1911 void copy_filename(char *dst, const char *src, int size) 1912 { 1913 if (*src && (*src == '"')) { 1914 ++src; 1915 --size; 1916 } 1917 1918 while ((--size > 0) && *src && (*src != '"')) 1919 *dst++ = *src++; 1920 *dst = '\0'; 1921 } 1922 1923 #if defined(CONFIG_CMD_NFS) || \ 1924 defined(CONFIG_CMD_SNTP) || \ 1925 defined(CONFIG_CMD_DNS) 1926 /* 1927 * make port a little random (1024-17407) 1928 * This keeps the math somewhat trivial to compute, and seems to work with 1929 * all supported protocols/clients/servers 1930 */ 1931 unsigned int random_port(void) 1932 { 1933 return 1024 + (get_timer(0) % 0x4000); 1934 } 1935 #endif 1936 1937 void ip_to_string(IPaddr_t x, char *s) 1938 { 1939 x = ntohl(x); 1940 sprintf(s, "%d.%d.%d.%d", 1941 (int) ((x >> 24) & 0xff), 1942 (int) ((x >> 16) & 0xff), 1943 (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff) 1944 ); 1945 } 1946 1947 void VLAN_to_string(ushort x, char *s) 1948 { 1949 x = ntohs(x); 1950 1951 if (x == (ushort)-1) 1952 x = VLAN_NONE; 1953 1954 if (x == VLAN_NONE) 1955 strcpy(s, "none"); 1956 else 1957 sprintf(s, "%d", x & VLAN_IDMASK); 1958 } 1959 1960 ushort string_to_VLAN(const char *s) 1961 { 1962 ushort id; 1963 1964 if (s == NULL) 1965 return htons(VLAN_NONE); 1966 1967 if (*s < '0' || *s > '9') 1968 id = VLAN_NONE; 1969 else 1970 id = (ushort)simple_strtoul(s, NULL, 10); 1971 1972 return htons(id); 1973 } 1974 1975 ushort getenv_VLAN(char *var) 1976 { 1977 return string_to_VLAN(getenv(var)); 1978 } 1979