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 <linux/compiler.h> 81 #include <net.h> 82 #include "bootp.h" 83 #include "tftp.h" 84 #ifdef CONFIG_CMD_RARP 85 #include "rarp.h" 86 #endif 87 #include "nfs.h" 88 #ifdef CONFIG_STATUS_LED 89 #include <status_led.h> 90 #include <miiphy.h> 91 #endif 92 #if defined(CONFIG_CMD_SNTP) 93 #include "sntp.h" 94 #endif 95 #if defined(CONFIG_CDP_VERSION) 96 #include <timestamp.h> 97 #endif 98 #if defined(CONFIG_CMD_DNS) 99 #include "dns.h" 100 #endif 101 102 DECLARE_GLOBAL_DATA_PTR; 103 104 #ifndef CONFIG_ARP_TIMEOUT 105 /* Milliseconds before trying ARP again */ 106 # define ARP_TIMEOUT 5000UL 107 #else 108 # define ARP_TIMEOUT CONFIG_ARP_TIMEOUT 109 #endif 110 111 112 #ifndef CONFIG_NET_RETRY_COUNT 113 # define ARP_TIMEOUT_COUNT 5 /* # of timeouts before giving up */ 114 #else 115 # define ARP_TIMEOUT_COUNT CONFIG_NET_RETRY_COUNT 116 #endif 117 118 /** BOOTP EXTENTIONS **/ 119 120 /* Our subnet mask (0=unknown) */ 121 IPaddr_t NetOurSubnetMask; 122 /* Our gateways IP address */ 123 IPaddr_t NetOurGatewayIP; 124 /* Our DNS IP address */ 125 IPaddr_t NetOurDNSIP; 126 #if defined(CONFIG_BOOTP_DNS2) 127 /* Our 2nd DNS IP address */ 128 IPaddr_t NetOurDNS2IP; 129 #endif 130 /* Our NIS domain */ 131 char NetOurNISDomain[32] = {0,}; 132 /* Our hostname */ 133 char NetOurHostName[32] = {0,}; 134 /* Our bootpath */ 135 char NetOurRootPath[64] = {0,}; 136 /* Our bootfile size in blocks */ 137 ushort NetBootFileSize; 138 139 #ifdef CONFIG_MCAST_TFTP /* Multicast TFTP */ 140 IPaddr_t Mcast_addr; 141 #endif 142 143 /** END OF BOOTP EXTENTIONS **/ 144 145 /* The actual transferred size of the bootfile (in bytes) */ 146 ulong NetBootFileXferSize; 147 /* Our ethernet address */ 148 uchar NetOurEther[6]; 149 /* Boot server enet address */ 150 uchar NetServerEther[6]; 151 /* Our IP addr (0 = unknown) */ 152 IPaddr_t NetOurIP; 153 /* Server IP addr (0 = unknown) */ 154 IPaddr_t NetServerIP; 155 /* Current receive packet */ 156 uchar *NetRxPacket; 157 /* Current rx packet length */ 158 int NetRxPacketLen; 159 /* IP packet ID */ 160 unsigned NetIPID; 161 /* Ethernet bcast address */ 162 uchar NetBcastAddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 163 uchar NetEtherNullAddr[6]; 164 #ifdef CONFIG_API 165 void (*push_packet)(void *, int len) = 0; 166 #endif 167 #if defined(CONFIG_CMD_CDP) 168 /* Ethernet bcast address */ 169 uchar NetCDPAddr[6] = { 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc }; 170 #endif 171 /* Network loop state */ 172 int NetState; 173 /* Tried all network devices */ 174 int NetRestartWrap; 175 /* Network loop restarted */ 176 static int NetRestarted; 177 /* At least one device configured */ 178 static int NetDevExists; 179 180 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */ 181 /* default is without VLAN */ 182 ushort NetOurVLAN = 0xFFFF; 183 /* ditto */ 184 ushort NetOurNativeVLAN = 0xFFFF; 185 186 /* Boot File name */ 187 char BootFile[128]; 188 189 #if defined(CONFIG_CMD_PING) 190 /* the ip address to ping */ 191 IPaddr_t NetPingIP; 192 193 static void PingStart(void); 194 #endif 195 196 #if defined(CONFIG_CMD_CDP) 197 static void CDPStart(void); 198 #endif 199 200 #if defined(CONFIG_CMD_SNTP) 201 /* NTP server IP address */ 202 IPaddr_t NetNtpServerIP; 203 /* offset time from UTC */ 204 int NetTimeOffset; 205 #endif 206 207 uchar PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN]; 208 209 /* Receive packet */ 210 uchar *NetRxPackets[PKTBUFSRX]; 211 212 /* Current RX packet handler */ 213 static rxhand_f *packetHandler; 214 #ifdef CONFIG_CMD_TFTPPUT 215 static rxhand_icmp_f *packet_icmp_handler; /* Current ICMP rx handler */ 216 #endif 217 /* Current timeout handler */ 218 static thand_f *timeHandler; 219 /* Time base value */ 220 static ulong timeStart; 221 /* Current timeout value */ 222 static ulong timeDelta; 223 /* THE transmit packet */ 224 uchar *NetTxPacket; 225 226 static int net_check_prereq(enum proto_t protocol); 227 228 static int NetTryCount; 229 230 /**********************************************************************/ 231 232 IPaddr_t NetArpWaitPacketIP; 233 IPaddr_t NetArpWaitReplyIP; 234 /* MAC address of waiting packet's destination */ 235 uchar *NetArpWaitPacketMAC; 236 /* THE transmit packet */ 237 uchar *NetArpWaitTxPacket; 238 int NetArpWaitTxPacketSize; 239 uchar NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN]; 240 ulong NetArpWaitTimerStart; 241 int NetArpWaitTry; 242 243 void ArpRequest(void) 244 { 245 uchar *pkt; 246 ARP_t *arp; 247 248 debug("ARP broadcast %d\n", NetArpWaitTry); 249 250 pkt = NetTxPacket; 251 252 pkt += NetSetEther(pkt, NetBcastAddr, PROT_ARP); 253 254 arp = (ARP_t *) pkt; 255 256 arp->ar_hrd = htons(ARP_ETHER); 257 arp->ar_pro = htons(PROT_IP); 258 arp->ar_hln = 6; 259 arp->ar_pln = 4; 260 arp->ar_op = htons(ARPOP_REQUEST); 261 262 /* source ET addr */ 263 memcpy(&arp->ar_data[0], NetOurEther, 6); 264 /* source IP addr */ 265 NetWriteIP((uchar *) &arp->ar_data[6], NetOurIP); 266 /* dest ET addr = 0 */ 267 memset(&arp->ar_data[10], '\0', 6); 268 if ((NetArpWaitPacketIP & NetOurSubnetMask) != 269 (NetOurIP & NetOurSubnetMask)) { 270 if (NetOurGatewayIP == 0) { 271 puts("## Warning: gatewayip needed but not set\n"); 272 NetArpWaitReplyIP = NetArpWaitPacketIP; 273 } else { 274 NetArpWaitReplyIP = NetOurGatewayIP; 275 } 276 } else { 277 NetArpWaitReplyIP = NetArpWaitPacketIP; 278 } 279 280 NetWriteIP((uchar *) &arp->ar_data[16], NetArpWaitReplyIP); 281 (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE); 282 } 283 284 void ArpTimeoutCheck(void) 285 { 286 ulong t; 287 288 if (!NetArpWaitPacketIP) 289 return; 290 291 t = get_timer(0); 292 293 /* check for arp timeout */ 294 if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT) { 295 NetArpWaitTry++; 296 297 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) { 298 puts("\nARP Retry count exceeded; starting again\n"); 299 NetArpWaitTry = 0; 300 NetStartAgain(); 301 } else { 302 NetArpWaitTimerStart = t; 303 ArpRequest(); 304 } 305 } 306 } 307 308 /* 309 * Check if autoload is enabled. If so, use either NFS or TFTP to download 310 * the boot file. 311 */ 312 void net_auto_load(void) 313 { 314 const char *s = getenv("autoload"); 315 316 if (s != NULL) { 317 if (*s == 'n') { 318 /* 319 * Just use BOOTP/RARP to configure system; 320 * Do not use TFTP to load the bootfile. 321 */ 322 NetState = NETLOOP_SUCCESS; 323 return; 324 } 325 #if defined(CONFIG_CMD_NFS) 326 if (strcmp(s, "NFS") == 0) { 327 /* 328 * Use NFS to load the bootfile. 329 */ 330 NfsStart(); 331 return; 332 } 333 #endif 334 } 335 TftpStart(TFTPGET); 336 } 337 338 static void NetInitLoop(enum proto_t protocol) 339 { 340 static int env_changed_id; 341 int env_id = get_env_id(); 342 343 /* update only when the environment has changed */ 344 if (env_changed_id != env_id) { 345 NetOurIP = getenv_IPaddr("ipaddr"); 346 NetOurGatewayIP = getenv_IPaddr("gatewayip"); 347 NetOurSubnetMask = getenv_IPaddr("netmask"); 348 NetServerIP = getenv_IPaddr("serverip"); 349 NetOurNativeVLAN = getenv_VLAN("nvlan"); 350 NetOurVLAN = getenv_VLAN("vlan"); 351 #if defined(CONFIG_CMD_DNS) 352 NetOurDNSIP = getenv_IPaddr("dnsip"); 353 #endif 354 env_changed_id = env_id; 355 } 356 357 return; 358 } 359 360 /**********************************************************************/ 361 /* 362 * Main network processing loop. 363 */ 364 365 int NetLoop(enum proto_t protocol) 366 { 367 bd_t *bd = gd->bd; 368 int ret = -1; 369 370 NetRestarted = 0; 371 NetDevExists = 0; 372 373 /* XXX problem with bss workaround */ 374 NetArpWaitPacketMAC = NULL; 375 NetArpWaitTxPacket = NULL; 376 NetArpWaitPacketIP = 0; 377 NetArpWaitReplyIP = 0; 378 NetArpWaitTxPacket = NULL; 379 NetTxPacket = NULL; 380 NetTryCount = 1; 381 382 if (!NetTxPacket) { 383 int i; 384 /* 385 * Setup packet buffers, aligned correctly. 386 */ 387 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1); 388 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN; 389 for (i = 0; i < PKTBUFSRX; i++) 390 NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN; 391 } 392 393 if (!NetArpWaitTxPacket) { 394 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1); 395 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN; 396 NetArpWaitTxPacketSize = 0; 397 } 398 399 bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start"); 400 eth_halt(); 401 eth_set_current(); 402 if (eth_init(bd) < 0) { 403 eth_halt(); 404 return -1; 405 } 406 407 restart: 408 memcpy(NetOurEther, eth_get_dev()->enetaddr, 6); 409 410 NetState = NETLOOP_CONTINUE; 411 412 /* 413 * Start the ball rolling with the given start function. From 414 * here on, this code is a state machine driven by received 415 * packets and timer events. 416 */ 417 NetInitLoop(protocol); 418 419 switch (net_check_prereq(protocol)) { 420 case 1: 421 /* network not configured */ 422 eth_halt(); 423 return -1; 424 425 case 2: 426 /* network device not configured */ 427 break; 428 429 case 0: 430 NetDevExists = 1; 431 NetBootFileXferSize = 0; 432 switch (protocol) { 433 case TFTPGET: 434 #ifdef CONFIG_CMD_TFTPPUT 435 case TFTPPUT: 436 #endif 437 /* always use ARP to get server ethernet address */ 438 TftpStart(protocol); 439 break; 440 #ifdef CONFIG_CMD_TFTPSRV 441 case TFTPSRV: 442 TftpStartServer(); 443 break; 444 #endif 445 #if defined(CONFIG_CMD_DHCP) 446 case DHCP: 447 BootpTry = 0; 448 NetOurIP = 0; 449 DhcpRequest(); /* Basically same as BOOTP */ 450 break; 451 #endif 452 453 case BOOTP: 454 BootpTry = 0; 455 NetOurIP = 0; 456 BootpRequest(); 457 break; 458 459 #if defined(CONFIG_CMD_RARP) 460 case RARP: 461 RarpTry = 0; 462 NetOurIP = 0; 463 RarpRequest(); 464 break; 465 #endif 466 #if defined(CONFIG_CMD_PING) 467 case PING: 468 PingStart(); 469 break; 470 #endif 471 #if defined(CONFIG_CMD_NFS) 472 case NFS: 473 NfsStart(); 474 break; 475 #endif 476 #if defined(CONFIG_CMD_CDP) 477 case CDP: 478 CDPStart(); 479 break; 480 #endif 481 #ifdef CONFIG_NETCONSOLE 482 case NETCONS: 483 NcStart(); 484 break; 485 #endif 486 #if defined(CONFIG_CMD_SNTP) 487 case SNTP: 488 SntpStart(); 489 break; 490 #endif 491 #if defined(CONFIG_CMD_DNS) 492 case DNS: 493 DnsStart(); 494 break; 495 #endif 496 default: 497 break; 498 } 499 500 break; 501 } 502 503 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 504 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ 505 defined(CONFIG_STATUS_LED) && \ 506 defined(STATUS_LED_RED) 507 /* 508 * Echo the inverted link state to the fault LED. 509 */ 510 if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) 511 status_led_set(STATUS_LED_RED, STATUS_LED_OFF); 512 else 513 status_led_set(STATUS_LED_RED, STATUS_LED_ON); 514 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 515 #endif /* CONFIG_MII, ... */ 516 517 /* 518 * Main packet reception loop. Loop receiving packets until 519 * someone sets `NetState' to a state that terminates. 520 */ 521 for (;;) { 522 WATCHDOG_RESET(); 523 #ifdef CONFIG_SHOW_ACTIVITY 524 show_activity(1); 525 #endif 526 /* 527 * Check the ethernet for a new packet. The ethernet 528 * receive routine will process it. 529 */ 530 eth_rx(); 531 532 /* 533 * Abort if ctrl-c was pressed. 534 */ 535 if (ctrlc()) { 536 eth_halt(); 537 puts("\nAbort\n"); 538 goto done; 539 } 540 541 ArpTimeoutCheck(); 542 543 /* 544 * Check for a timeout, and run the timeout handler 545 * if we have one. 546 */ 547 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) { 548 thand_f *x; 549 550 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 551 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ 552 defined(CONFIG_STATUS_LED) && \ 553 defined(STATUS_LED_RED) 554 /* 555 * Echo the inverted link state to the fault LED. 556 */ 557 if (miiphy_link(eth_get_dev()->name, 558 CONFIG_SYS_FAULT_MII_ADDR)) { 559 status_led_set(STATUS_LED_RED, STATUS_LED_OFF); 560 } else { 561 status_led_set(STATUS_LED_RED, STATUS_LED_ON); 562 } 563 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 564 #endif /* CONFIG_MII, ... */ 565 x = timeHandler; 566 timeHandler = (thand_f *)0; 567 (*x)(); 568 } 569 570 571 switch (NetState) { 572 573 case NETLOOP_RESTART: 574 NetRestarted = 1; 575 goto restart; 576 577 case NETLOOP_SUCCESS: 578 if (NetBootFileXferSize > 0) { 579 char buf[20]; 580 printf("Bytes transferred = %ld (%lx hex)\n", 581 NetBootFileXferSize, 582 NetBootFileXferSize); 583 sprintf(buf, "%lX", NetBootFileXferSize); 584 setenv("filesize", buf); 585 586 sprintf(buf, "%lX", (unsigned long)load_addr); 587 setenv("fileaddr", buf); 588 } 589 eth_halt(); 590 ret = NetBootFileXferSize; 591 goto done; 592 593 case NETLOOP_FAIL: 594 goto done; 595 } 596 } 597 598 done: 599 #ifdef CONFIG_CMD_TFTPPUT 600 /* Clear out the handlers */ 601 NetSetHandler(NULL); 602 net_set_icmp_handler(NULL); 603 #endif 604 return ret; 605 } 606 607 /**********************************************************************/ 608 609 static void 610 startAgainTimeout(void) 611 { 612 NetState = NETLOOP_RESTART; 613 } 614 615 static void 616 startAgainHandler(uchar *pkt, unsigned dest, IPaddr_t sip, 617 unsigned src, unsigned len) 618 { 619 /* Totally ignore the packet */ 620 } 621 622 void NetStartAgain(void) 623 { 624 char *nretry; 625 int retry_forever = 0; 626 unsigned long retrycnt = 0; 627 628 nretry = getenv("netretry"); 629 if (nretry) { 630 if (!strcmp(nretry, "yes")) 631 retry_forever = 1; 632 else if (!strcmp(nretry, "no")) 633 retrycnt = 0; 634 else if (!strcmp(nretry, "once")) 635 retrycnt = 1; 636 else 637 retrycnt = simple_strtoul(nretry, NULL, 0); 638 } else 639 retry_forever = 1; 640 641 if ((!retry_forever) && (NetTryCount >= retrycnt)) { 642 eth_halt(); 643 NetState = NETLOOP_FAIL; 644 return; 645 } 646 647 NetTryCount++; 648 649 eth_halt(); 650 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER) 651 eth_try_another(!NetRestarted); 652 #endif 653 eth_init(gd->bd); 654 if (NetRestartWrap) { 655 NetRestartWrap = 0; 656 if (NetDevExists) { 657 NetSetTimeout(10000UL, startAgainTimeout); 658 NetSetHandler(startAgainHandler); 659 } else { 660 NetState = NETLOOP_FAIL; 661 } 662 } else { 663 NetState = NETLOOP_RESTART; 664 } 665 } 666 667 /**********************************************************************/ 668 /* 669 * Miscelaneous bits. 670 */ 671 672 void 673 NetSetHandler(rxhand_f *f) 674 { 675 packetHandler = f; 676 } 677 678 #ifdef CONFIG_CMD_TFTPPUT 679 void net_set_icmp_handler(rxhand_icmp_f *f) 680 { 681 packet_icmp_handler = f; 682 } 683 #endif 684 685 void 686 NetSetTimeout(ulong iv, thand_f *f) 687 { 688 if (iv == 0) { 689 timeHandler = (thand_f *)0; 690 } else { 691 timeHandler = f; 692 timeStart = get_timer(0); 693 timeDelta = iv; 694 } 695 } 696 697 698 void 699 NetSendPacket(uchar *pkt, int len) 700 { 701 (void) eth_send(pkt, len); 702 } 703 704 int 705 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len) 706 { 707 uchar *pkt; 708 709 /* convert to new style broadcast */ 710 if (dest == 0) 711 dest = 0xFFFFFFFF; 712 713 /* if broadcast, make the ether address a broadcast and don't do ARP */ 714 if (dest == 0xFFFFFFFF) 715 ether = NetBcastAddr; 716 717 /* 718 * if MAC address was not discovered yet, save the packet and do 719 * an ARP request 720 */ 721 if (memcmp(ether, NetEtherNullAddr, 6) == 0) { 722 723 debug("sending ARP for %08x\n", dest); 724 725 NetArpWaitPacketIP = dest; 726 NetArpWaitPacketMAC = ether; 727 728 pkt = NetArpWaitTxPacket; 729 pkt += NetSetEther(pkt, NetArpWaitPacketMAC, PROT_IP); 730 731 NetSetIP(pkt, dest, dport, sport, len); 732 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + 733 (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len); 734 735 /* size of the waiting packet */ 736 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + 737 IP_HDR_SIZE + len; 738 739 /* and do the ARP request */ 740 NetArpWaitTry = 1; 741 NetArpWaitTimerStart = get_timer(0); 742 ArpRequest(); 743 return 1; /* waiting */ 744 } 745 746 debug("sending UDP to %08x/%pM\n", dest, ether); 747 748 pkt = (uchar *)NetTxPacket; 749 pkt += NetSetEther(pkt, ether, PROT_IP); 750 NetSetIP(pkt, dest, dport, sport, len); 751 (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len); 752 753 return 0; /* transmitted */ 754 } 755 756 #if defined(CONFIG_CMD_PING) 757 static ushort PingSeqNo; 758 759 int PingSend(void) 760 { 761 static uchar mac[6]; 762 IP_t *ip; 763 ushort *s; 764 uchar *pkt; 765 766 /* XXX always send arp request */ 767 768 memcpy(mac, NetEtherNullAddr, 6); 769 770 debug("sending ARP for %08x\n", NetPingIP); 771 772 NetArpWaitPacketIP = NetPingIP; 773 NetArpWaitPacketMAC = mac; 774 775 pkt = NetArpWaitTxPacket; 776 pkt += NetSetEther(pkt, mac, PROT_IP); 777 778 ip = (IP_t *)pkt; 779 780 /* 781 * Construct an IP and ICMP header. 782 * (need to set no fragment bit - XXX) 783 */ 784 /* IP_HDR_SIZE / 4 (not including UDP) */ 785 ip->ip_hl_v = 0x45; 786 ip->ip_tos = 0; 787 ip->ip_len = htons(IP_HDR_SIZE_NO_UDP + 8); 788 ip->ip_id = htons(NetIPID++); 789 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ 790 ip->ip_ttl = 255; 791 ip->ip_p = 0x01; /* ICMP */ 792 ip->ip_sum = 0; 793 /* already in network byte order */ 794 NetCopyIP((void *)&ip->ip_src, &NetOurIP); 795 /* - "" - */ 796 NetCopyIP((void *)&ip->ip_dst, &NetPingIP); 797 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2); 798 799 s = &ip->udp_src; /* XXX ICMP starts here */ 800 s[0] = htons(0x0800); /* echo-request, code */ 801 s[1] = 0; /* checksum */ 802 s[2] = 0; /* identifier */ 803 s[3] = htons(PingSeqNo++); /* sequence number */ 804 s[1] = ~NetCksum((uchar *)s, 8/2); 805 806 /* size of the waiting packet */ 807 NetArpWaitTxPacketSize = 808 (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8; 809 810 /* and do the ARP request */ 811 NetArpWaitTry = 1; 812 NetArpWaitTimerStart = get_timer(0); 813 ArpRequest(); 814 return 1; /* waiting */ 815 } 816 817 static void 818 PingTimeout(void) 819 { 820 eth_halt(); 821 NetState = NETLOOP_FAIL; /* we did not get the reply */ 822 } 823 824 static void 825 PingHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 826 unsigned len) 827 { 828 if (sip != NetPingIP) 829 return; 830 831 NetState = NETLOOP_SUCCESS; 832 } 833 834 static void PingStart(void) 835 { 836 printf("Using %s device\n", eth_get_name()); 837 NetSetTimeout(10000UL, PingTimeout); 838 NetSetHandler(PingHandler); 839 840 PingSend(); 841 } 842 #endif 843 844 #if defined(CONFIG_CMD_CDP) 845 846 #define CDP_DEVICE_ID_TLV 0x0001 847 #define CDP_ADDRESS_TLV 0x0002 848 #define CDP_PORT_ID_TLV 0x0003 849 #define CDP_CAPABILITIES_TLV 0x0004 850 #define CDP_VERSION_TLV 0x0005 851 #define CDP_PLATFORM_TLV 0x0006 852 #define CDP_NATIVE_VLAN_TLV 0x000a 853 #define CDP_APPLIANCE_VLAN_TLV 0x000e 854 #define CDP_TRIGGER_TLV 0x000f 855 #define CDP_POWER_CONSUMPTION_TLV 0x0010 856 #define CDP_SYSNAME_TLV 0x0014 857 #define CDP_SYSOBJECT_TLV 0x0015 858 #define CDP_MANAGEMENT_ADDRESS_TLV 0x0016 859 860 #define CDP_TIMEOUT 250UL /* one packet every 250ms */ 861 862 static int CDPSeq; 863 static int CDPOK; 864 865 ushort CDPNativeVLAN; 866 ushort CDPApplianceVLAN; 867 868 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 869 0x00 }; 870 871 static ushort CDP_compute_csum(const uchar *buff, ushort len) 872 { 873 ushort csum; 874 int odd; 875 ulong result = 0; 876 ushort leftover; 877 ushort *p; 878 879 if (len > 0) { 880 odd = 1 & (ulong)buff; 881 if (odd) { 882 result = *buff << 8; 883 len--; 884 buff++; 885 } 886 while (len > 1) { 887 p = (ushort *)buff; 888 result += *p++; 889 buff = (uchar *)p; 890 if (result & 0x80000000) 891 result = (result & 0xFFFF) + (result >> 16); 892 len -= 2; 893 } 894 if (len) { 895 leftover = (signed short)(*(const signed char *)buff); 896 /* CISCO SUCKS big time! (and blows too): 897 * CDP uses the IP checksum algorithm with a twist; 898 * for the last byte it *sign* extends and sums. 899 */ 900 result = (result & 0xffff0000) | 901 ((result + leftover) & 0x0000ffff); 902 } 903 while (result >> 16) 904 result = (result & 0xFFFF) + (result >> 16); 905 906 if (odd) 907 result = ((result >> 8) & 0xff) | 908 ((result & 0xff) << 8); 909 } 910 911 /* add up 16-bit and 17-bit words for 17+c bits */ 912 result = (result & 0xffff) + (result >> 16); 913 /* add up 16-bit and 2-bit for 16+c bit */ 914 result = (result & 0xffff) + (result >> 16); 915 /* add up carry.. */ 916 result = (result & 0xffff) + (result >> 16); 917 918 /* negate */ 919 csum = ~(ushort)result; 920 921 /* run time endian detection */ 922 if (csum != htons(csum)) /* little endian */ 923 csum = htons(csum); 924 925 return csum; 926 } 927 928 int CDPSendTrigger(void) 929 { 930 uchar *pkt; 931 ushort *s; 932 ushort *cp; 933 Ethernet_t *et; 934 int len; 935 ushort chksum; 936 #if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID) || \ 937 defined(CONFIG_CDP_VERSION) || defined(CONFIG_CDP_PLATFORM) 938 char buf[32]; 939 #endif 940 941 pkt = NetTxPacket; 942 et = (Ethernet_t *)pkt; 943 944 /* NOTE: trigger sent not on any VLAN */ 945 946 /* form ethernet header */ 947 memcpy(et->et_dest, NetCDPAddr, 6); 948 memcpy(et->et_src, NetOurEther, 6); 949 950 pkt += ETHER_HDR_SIZE; 951 952 /* SNAP header */ 953 memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)); 954 pkt += sizeof(CDP_SNAP_hdr); 955 956 /* CDP header */ 957 *pkt++ = 0x02; /* CDP version 2 */ 958 *pkt++ = 180; /* TTL */ 959 s = (ushort *)pkt; 960 cp = s; 961 /* checksum (0 for later calculation) */ 962 *s++ = htons(0); 963 964 /* CDP fields */ 965 #ifdef CONFIG_CDP_DEVICE_ID 966 *s++ = htons(CDP_DEVICE_ID_TLV); 967 *s++ = htons(CONFIG_CDP_DEVICE_ID); 968 sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%pm", NetOurEther); 969 memcpy((uchar *)s, buf, 16); 970 s += 16 / 2; 971 #endif 972 973 #ifdef CONFIG_CDP_PORT_ID 974 *s++ = htons(CDP_PORT_ID_TLV); 975 memset(buf, 0, sizeof(buf)); 976 sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index()); 977 len = strlen(buf); 978 if (len & 1) /* make it even */ 979 len++; 980 *s++ = htons(len + 4); 981 memcpy((uchar *)s, buf, len); 982 s += len / 2; 983 #endif 984 985 #ifdef CONFIG_CDP_CAPABILITIES 986 *s++ = htons(CDP_CAPABILITIES_TLV); 987 *s++ = htons(8); 988 *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES); 989 s += 2; 990 #endif 991 992 #ifdef CONFIG_CDP_VERSION 993 *s++ = htons(CDP_VERSION_TLV); 994 memset(buf, 0, sizeof(buf)); 995 strcpy(buf, CONFIG_CDP_VERSION); 996 len = strlen(buf); 997 if (len & 1) /* make it even */ 998 len++; 999 *s++ = htons(len + 4); 1000 memcpy((uchar *)s, buf, len); 1001 s += len / 2; 1002 #endif 1003 1004 #ifdef CONFIG_CDP_PLATFORM 1005 *s++ = htons(CDP_PLATFORM_TLV); 1006 memset(buf, 0, sizeof(buf)); 1007 strcpy(buf, CONFIG_CDP_PLATFORM); 1008 len = strlen(buf); 1009 if (len & 1) /* make it even */ 1010 len++; 1011 *s++ = htons(len + 4); 1012 memcpy((uchar *)s, buf, len); 1013 s += len / 2; 1014 #endif 1015 1016 #ifdef CONFIG_CDP_TRIGGER 1017 *s++ = htons(CDP_TRIGGER_TLV); 1018 *s++ = htons(8); 1019 *(ulong *)s = htonl(CONFIG_CDP_TRIGGER); 1020 s += 2; 1021 #endif 1022 1023 #ifdef CONFIG_CDP_POWER_CONSUMPTION 1024 *s++ = htons(CDP_POWER_CONSUMPTION_TLV); 1025 *s++ = htons(6); 1026 *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION); 1027 #endif 1028 1029 /* length of ethernet packet */ 1030 len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE); 1031 et->et_protlen = htons(len); 1032 1033 len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr); 1034 chksum = CDP_compute_csum((uchar *)NetTxPacket + len, 1035 (uchar *)s - (NetTxPacket + len)); 1036 if (chksum == 0) 1037 chksum = 0xFFFF; 1038 *cp = htons(chksum); 1039 1040 (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket); 1041 return 0; 1042 } 1043 1044 static void 1045 CDPTimeout(void) 1046 { 1047 CDPSeq++; 1048 1049 if (CDPSeq < 3) { 1050 NetSetTimeout(CDP_TIMEOUT, CDPTimeout); 1051 CDPSendTrigger(); 1052 return; 1053 } 1054 1055 /* if not OK try again */ 1056 if (!CDPOK) 1057 NetStartAgain(); 1058 else 1059 NetState = NETLOOP_SUCCESS; 1060 } 1061 1062 static void 1063 CDPDummyHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 1064 unsigned len) 1065 { 1066 /* nothing */ 1067 } 1068 1069 static void 1070 CDPHandler(const uchar *pkt, unsigned len) 1071 { 1072 const uchar *t; 1073 const ushort *ss; 1074 ushort type, tlen; 1075 ushort vlan, nvlan; 1076 1077 /* minimum size? */ 1078 if (len < sizeof(CDP_SNAP_hdr) + 4) 1079 goto pkt_short; 1080 1081 /* check for valid CDP SNAP header */ 1082 if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0) 1083 return; 1084 1085 pkt += sizeof(CDP_SNAP_hdr); 1086 len -= sizeof(CDP_SNAP_hdr); 1087 1088 /* Version of CDP protocol must be >= 2 and TTL != 0 */ 1089 if (pkt[0] < 0x02 || pkt[1] == 0) 1090 return; 1091 1092 /* 1093 * if version is greater than 0x02 maybe we'll have a problem; 1094 * output a warning 1095 */ 1096 if (pkt[0] != 0x02) 1097 printf("**WARNING: CDP packet received with a protocol version " 1098 "%d > 2\n", pkt[0] & 0xff); 1099 1100 if (CDP_compute_csum(pkt, len) != 0) 1101 return; 1102 1103 pkt += 4; 1104 len -= 4; 1105 1106 vlan = htons(-1); 1107 nvlan = htons(-1); 1108 while (len > 0) { 1109 if (len < 4) 1110 goto pkt_short; 1111 1112 ss = (const ushort *)pkt; 1113 type = ntohs(ss[0]); 1114 tlen = ntohs(ss[1]); 1115 if (tlen > len) 1116 goto pkt_short; 1117 1118 pkt += tlen; 1119 len -= tlen; 1120 1121 ss += 2; /* point ss to the data of the TLV */ 1122 tlen -= 4; 1123 1124 switch (type) { 1125 case CDP_DEVICE_ID_TLV: 1126 break; 1127 case CDP_ADDRESS_TLV: 1128 break; 1129 case CDP_PORT_ID_TLV: 1130 break; 1131 case CDP_CAPABILITIES_TLV: 1132 break; 1133 case CDP_VERSION_TLV: 1134 break; 1135 case CDP_PLATFORM_TLV: 1136 break; 1137 case CDP_NATIVE_VLAN_TLV: 1138 nvlan = *ss; 1139 break; 1140 case CDP_APPLIANCE_VLAN_TLV: 1141 t = (const uchar *)ss; 1142 while (tlen > 0) { 1143 if (tlen < 3) 1144 goto pkt_short; 1145 1146 ss = (const ushort *)(t + 1); 1147 1148 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE 1149 if (t[0] == CONFIG_CDP_APPLIANCE_VLAN_TYPE) 1150 vlan = *ss; 1151 #else 1152 /* XXX will this work; dunno */ 1153 vlan = ntohs(*ss); 1154 #endif 1155 t += 3; tlen -= 3; 1156 } 1157 break; 1158 case CDP_TRIGGER_TLV: 1159 break; 1160 case CDP_POWER_CONSUMPTION_TLV: 1161 break; 1162 case CDP_SYSNAME_TLV: 1163 break; 1164 case CDP_SYSOBJECT_TLV: 1165 break; 1166 case CDP_MANAGEMENT_ADDRESS_TLV: 1167 break; 1168 } 1169 } 1170 1171 CDPApplianceVLAN = vlan; 1172 CDPNativeVLAN = nvlan; 1173 1174 CDPOK = 1; 1175 return; 1176 1177 pkt_short: 1178 printf("** CDP packet is too short\n"); 1179 return; 1180 } 1181 1182 static void CDPStart(void) 1183 { 1184 printf("Using %s device\n", eth_get_name()); 1185 CDPSeq = 0; 1186 CDPOK = 0; 1187 1188 CDPNativeVLAN = htons(-1); 1189 CDPApplianceVLAN = htons(-1); 1190 1191 NetSetTimeout(CDP_TIMEOUT, CDPTimeout); 1192 NetSetHandler(CDPDummyHandler); 1193 1194 CDPSendTrigger(); 1195 } 1196 #endif 1197 1198 #ifdef CONFIG_IP_DEFRAG 1199 /* 1200 * This function collects fragments in a single packet, according 1201 * to the algorithm in RFC815. It returns NULL or the pointer to 1202 * a complete packet, in static storage 1203 */ 1204 #ifndef CONFIG_NET_MAXDEFRAG 1205 #define CONFIG_NET_MAXDEFRAG 16384 1206 #endif 1207 /* 1208 * MAXDEFRAG, above, is chosen in the config file and is real data 1209 * so we need to add the NFS overhead, which is more than TFTP. 1210 * To use sizeof in the internal unnamed structures, we need a real 1211 * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately). 1212 * The compiler doesn't complain nor allocates the actual structure 1213 */ 1214 static struct rpc_t rpc_specimen; 1215 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply)) 1216 1217 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE_NO_UDP) 1218 1219 /* 1220 * this is the packet being assembled, either data or frag control. 1221 * Fragments go by 8 bytes, so this union must be 8 bytes long 1222 */ 1223 struct hole { 1224 /* first_byte is address of this structure */ 1225 u16 last_byte; /* last byte in this hole + 1 (begin of next hole) */ 1226 u16 next_hole; /* index of next (in 8-b blocks), 0 == none */ 1227 u16 prev_hole; /* index of prev, 0 == none */ 1228 u16 unused; 1229 }; 1230 1231 static IP_t *__NetDefragment(IP_t *ip, int *lenp) 1232 { 1233 static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN); 1234 static u16 first_hole, total_len; 1235 struct hole *payload, *thisfrag, *h, *newh; 1236 IP_t *localip = (IP_t *)pkt_buff; 1237 uchar *indata = (uchar *)ip; 1238 int offset8, start, len, done = 0; 1239 u16 ip_off = ntohs(ip->ip_off); 1240 1241 /* payload starts after IP header, this fragment is in there */ 1242 payload = (struct hole *)(pkt_buff + IP_HDR_SIZE_NO_UDP); 1243 offset8 = (ip_off & IP_OFFS); 1244 thisfrag = payload + offset8; 1245 start = offset8 * 8; 1246 len = ntohs(ip->ip_len) - IP_HDR_SIZE_NO_UDP; 1247 1248 if (start + len > IP_MAXUDP) /* fragment extends too far */ 1249 return NULL; 1250 1251 if (!total_len || localip->ip_id != ip->ip_id) { 1252 /* new (or different) packet, reset structs */ 1253 total_len = 0xffff; 1254 payload[0].last_byte = ~0; 1255 payload[0].next_hole = 0; 1256 payload[0].prev_hole = 0; 1257 first_hole = 0; 1258 /* any IP header will work, copy the first we received */ 1259 memcpy(localip, ip, IP_HDR_SIZE_NO_UDP); 1260 } 1261 1262 /* 1263 * What follows is the reassembly algorithm. We use the payload 1264 * array as a linked list of hole descriptors, as each hole starts 1265 * at a multiple of 8 bytes. However, last byte can be whatever value, 1266 * so it is represented as byte count, not as 8-byte blocks. 1267 */ 1268 1269 h = payload + first_hole; 1270 while (h->last_byte < start) { 1271 if (!h->next_hole) { 1272 /* no hole that far away */ 1273 return NULL; 1274 } 1275 h = payload + h->next_hole; 1276 } 1277 1278 /* last fragment may be 1..7 bytes, the "+7" forces acceptance */ 1279 if (offset8 + ((len + 7) / 8) <= h - payload) { 1280 /* no overlap with holes (dup fragment?) */ 1281 return NULL; 1282 } 1283 1284 if (!(ip_off & IP_FLAGS_MFRAG)) { 1285 /* no more fragmentss: truncate this (last) hole */ 1286 total_len = start + len; 1287 h->last_byte = start + len; 1288 } 1289 1290 /* 1291 * There is some overlap: fix the hole list. This code doesn't 1292 * deal with a fragment that overlaps with two different holes 1293 * (thus being a superset of a previously-received fragment). 1294 */ 1295 1296 if ((h >= thisfrag) && (h->last_byte <= start + len)) { 1297 /* complete overlap with hole: remove hole */ 1298 if (!h->prev_hole && !h->next_hole) { 1299 /* last remaining hole */ 1300 done = 1; 1301 } else if (!h->prev_hole) { 1302 /* first hole */ 1303 first_hole = h->next_hole; 1304 payload[h->next_hole].prev_hole = 0; 1305 } else if (!h->next_hole) { 1306 /* last hole */ 1307 payload[h->prev_hole].next_hole = 0; 1308 } else { 1309 /* in the middle of the list */ 1310 payload[h->next_hole].prev_hole = h->prev_hole; 1311 payload[h->prev_hole].next_hole = h->next_hole; 1312 } 1313 1314 } else if (h->last_byte <= start + len) { 1315 /* overlaps with final part of the hole: shorten this hole */ 1316 h->last_byte = start; 1317 1318 } else if (h >= thisfrag) { 1319 /* overlaps with initial part of the hole: move this hole */ 1320 newh = thisfrag + (len / 8); 1321 *newh = *h; 1322 h = newh; 1323 if (h->next_hole) 1324 payload[h->next_hole].prev_hole = (h - payload); 1325 if (h->prev_hole) 1326 payload[h->prev_hole].next_hole = (h - payload); 1327 else 1328 first_hole = (h - payload); 1329 1330 } else { 1331 /* fragment sits in the middle: split the hole */ 1332 newh = thisfrag + (len / 8); 1333 *newh = *h; 1334 h->last_byte = start; 1335 h->next_hole = (newh - payload); 1336 newh->prev_hole = (h - payload); 1337 if (newh->next_hole) 1338 payload[newh->next_hole].prev_hole = (newh - payload); 1339 } 1340 1341 /* finally copy this fragment and possibly return whole packet */ 1342 memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE_NO_UDP, len); 1343 if (!done) 1344 return NULL; 1345 1346 localip->ip_len = htons(total_len); 1347 *lenp = total_len + IP_HDR_SIZE_NO_UDP; 1348 return localip; 1349 } 1350 1351 static inline IP_t *NetDefragment(IP_t *ip, int *lenp) 1352 { 1353 u16 ip_off = ntohs(ip->ip_off); 1354 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) 1355 return ip; /* not a fragment */ 1356 return __NetDefragment(ip, lenp); 1357 } 1358 1359 #else /* !CONFIG_IP_DEFRAG */ 1360 1361 static inline IP_t *NetDefragment(IP_t *ip, int *lenp) 1362 { 1363 u16 ip_off = ntohs(ip->ip_off); 1364 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) 1365 return ip; /* not a fragment */ 1366 return NULL; 1367 } 1368 #endif 1369 1370 /** 1371 * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently 1372 * drop others. 1373 * 1374 * @parma ip IP packet containing the ICMP 1375 */ 1376 static void receive_icmp(IP_t *ip, int len, IPaddr_t src_ip, Ethernet_t *et) 1377 { 1378 ICMP_t *icmph = (ICMP_t *)&ip->udp_src; 1379 1380 switch (icmph->type) { 1381 case ICMP_REDIRECT: 1382 if (icmph->code != ICMP_REDIR_HOST) 1383 return; 1384 printf(" ICMP Host Redirect to %pI4 ", 1385 &icmph->un.gateway); 1386 break; 1387 #if defined(CONFIG_CMD_PING) 1388 case ICMP_ECHO_REPLY: 1389 /* 1390 * IP header OK. Pass the packet to the 1391 * current handler. 1392 */ 1393 /* 1394 * XXX point to ip packet - should this use 1395 * packet_icmp_handler? 1396 */ 1397 (*packetHandler)((uchar *)ip, 0, src_ip, 0, 0); 1398 break; 1399 case ICMP_ECHO_REQUEST: 1400 debug("Got ICMP ECHO REQUEST, return %d bytes\n", 1401 ETHER_HDR_SIZE + len); 1402 1403 memcpy(&et->et_dest[0], &et->et_src[0], 6); 1404 memcpy(&et->et_src[0], NetOurEther, 6); 1405 1406 ip->ip_sum = 0; 1407 ip->ip_off = 0; 1408 NetCopyIP((void *)&ip->ip_dst, &ip->ip_src); 1409 NetCopyIP((void *)&ip->ip_src, &NetOurIP); 1410 ip->ip_sum = ~NetCksum((uchar *)ip, 1411 IP_HDR_SIZE_NO_UDP >> 1); 1412 1413 icmph->type = ICMP_ECHO_REPLY; 1414 icmph->checksum = 0; 1415 icmph->checksum = ~NetCksum((uchar *)icmph, 1416 (len - IP_HDR_SIZE_NO_UDP) >> 1); 1417 (void) eth_send((uchar *)et, 1418 ETHER_HDR_SIZE + len); 1419 break; 1420 #endif 1421 default: 1422 #ifdef CONFIG_CMD_TFTPPUT 1423 if (packet_icmp_handler) 1424 packet_icmp_handler(icmph->type, icmph->code, 1425 ntohs(ip->udp_dst), src_ip, ntohs(ip->udp_src), 1426 icmph->un.data, ntohs(ip->udp_len)); 1427 #endif 1428 break; 1429 } 1430 } 1431 1432 void 1433 NetReceive(uchar *inpkt, int len) 1434 { 1435 Ethernet_t *et; 1436 IP_t *ip; 1437 ARP_t *arp; 1438 IPaddr_t tmp; 1439 IPaddr_t src_ip; 1440 int x; 1441 uchar *pkt; 1442 #if defined(CONFIG_CMD_CDP) 1443 int iscdp; 1444 #endif 1445 ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid; 1446 1447 debug("packet received\n"); 1448 1449 NetRxPacket = inpkt; 1450 NetRxPacketLen = len; 1451 et = (Ethernet_t *)inpkt; 1452 1453 /* too small packet? */ 1454 if (len < ETHER_HDR_SIZE) 1455 return; 1456 1457 #ifdef CONFIG_API 1458 if (push_packet) { 1459 (*push_packet)(inpkt, len); 1460 return; 1461 } 1462 #endif 1463 1464 #if defined(CONFIG_CMD_CDP) 1465 /* keep track if packet is CDP */ 1466 iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0; 1467 #endif 1468 1469 myvlanid = ntohs(NetOurVLAN); 1470 if (myvlanid == (ushort)-1) 1471 myvlanid = VLAN_NONE; 1472 mynvlanid = ntohs(NetOurNativeVLAN); 1473 if (mynvlanid == (ushort)-1) 1474 mynvlanid = VLAN_NONE; 1475 1476 x = ntohs(et->et_protlen); 1477 1478 debug("packet received\n"); 1479 1480 if (x < 1514) { 1481 /* 1482 * Got a 802 packet. Check the other protocol field. 1483 */ 1484 x = ntohs(et->et_prot); 1485 1486 ip = (IP_t *)(inpkt + E802_HDR_SIZE); 1487 len -= E802_HDR_SIZE; 1488 1489 } else if (x != PROT_VLAN) { /* normal packet */ 1490 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE); 1491 len -= ETHER_HDR_SIZE; 1492 1493 } else { /* VLAN packet */ 1494 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et; 1495 1496 debug("VLAN packet received\n"); 1497 1498 /* too small packet? */ 1499 if (len < VLAN_ETHER_HDR_SIZE) 1500 return; 1501 1502 /* if no VLAN active */ 1503 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE 1504 #if defined(CONFIG_CMD_CDP) 1505 && iscdp == 0 1506 #endif 1507 ) 1508 return; 1509 1510 cti = ntohs(vet->vet_tag); 1511 vlanid = cti & VLAN_IDMASK; 1512 x = ntohs(vet->vet_type); 1513 1514 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE); 1515 len -= VLAN_ETHER_HDR_SIZE; 1516 } 1517 1518 debug("Receive from protocol 0x%x\n", x); 1519 1520 #if defined(CONFIG_CMD_CDP) 1521 if (iscdp) { 1522 CDPHandler((uchar *)ip, len); 1523 return; 1524 } 1525 #endif 1526 1527 if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) { 1528 if (vlanid == VLAN_NONE) 1529 vlanid = (mynvlanid & VLAN_IDMASK); 1530 /* not matched? */ 1531 if (vlanid != (myvlanid & VLAN_IDMASK)) 1532 return; 1533 } 1534 1535 switch (x) { 1536 1537 case PROT_ARP: 1538 /* 1539 * We have to deal with two types of ARP packets: 1540 * - REQUEST packets will be answered by sending our 1541 * IP address - if we know it. 1542 * - REPLY packates are expected only after we asked 1543 * for the TFTP server's or the gateway's ethernet 1544 * address; so if we receive such a packet, we set 1545 * the server ethernet address 1546 */ 1547 debug("Got ARP\n"); 1548 1549 arp = (ARP_t *)ip; 1550 if (len < ARP_HDR_SIZE) { 1551 printf("bad length %d < %d\n", len, ARP_HDR_SIZE); 1552 return; 1553 } 1554 if (ntohs(arp->ar_hrd) != ARP_ETHER) 1555 return; 1556 if (ntohs(arp->ar_pro) != PROT_IP) 1557 return; 1558 if (arp->ar_hln != 6) 1559 return; 1560 if (arp->ar_pln != 4) 1561 return; 1562 1563 if (NetOurIP == 0) 1564 return; 1565 1566 if (NetReadIP(&arp->ar_data[16]) != NetOurIP) 1567 return; 1568 1569 switch (ntohs(arp->ar_op)) { 1570 case ARPOP_REQUEST: 1571 /* reply with our IP address */ 1572 debug("Got ARP REQUEST, return our IP\n"); 1573 pkt = (uchar *)et; 1574 pkt += NetSetEther(pkt, et->et_src, PROT_ARP); 1575 arp->ar_op = htons(ARPOP_REPLY); 1576 memcpy(&arp->ar_data[10], &arp->ar_data[0], 6); 1577 NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]); 1578 memcpy(&arp->ar_data[0], NetOurEther, 6); 1579 NetCopyIP(&arp->ar_data[6], &NetOurIP); 1580 (void) eth_send((uchar *)et, 1581 (pkt - (uchar *)et) + ARP_HDR_SIZE); 1582 return; 1583 1584 case ARPOP_REPLY: /* arp reply */ 1585 /* are we waiting for a reply */ 1586 if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC) 1587 break; 1588 1589 #ifdef CONFIG_KEEP_SERVERADDR 1590 if (NetServerIP == NetArpWaitPacketIP) { 1591 char buf[20]; 1592 sprintf(buf, "%pM", arp->ar_data); 1593 setenv("serveraddr", buf); 1594 } 1595 #endif 1596 1597 debug("Got ARP REPLY, set server/gtwy eth addr (%pM)\n", 1598 arp->ar_data); 1599 1600 tmp = NetReadIP(&arp->ar_data[6]); 1601 1602 /* matched waiting packet's address */ 1603 if (tmp == NetArpWaitReplyIP) { 1604 debug("Got it\n"); 1605 1606 /* save address for later use */ 1607 memcpy(NetArpWaitPacketMAC, 1608 &arp->ar_data[0], 6); 1609 1610 #ifdef CONFIG_NETCONSOLE 1611 (*packetHandler)(0, 0, 0, 0, 0); 1612 #endif 1613 /* modify header, and transmit it */ 1614 memcpy(((Ethernet_t *)NetArpWaitTxPacket)-> 1615 et_dest, NetArpWaitPacketMAC, 6); 1616 (void) eth_send(NetArpWaitTxPacket, 1617 NetArpWaitTxPacketSize); 1618 1619 /* no arp request pending now */ 1620 NetArpWaitPacketIP = 0; 1621 NetArpWaitTxPacketSize = 0; 1622 NetArpWaitPacketMAC = NULL; 1623 1624 } 1625 return; 1626 default: 1627 debug("Unexpected ARP opcode 0x%x\n", 1628 ntohs(arp->ar_op)); 1629 return; 1630 } 1631 break; 1632 1633 #ifdef CONFIG_CMD_RARP 1634 case PROT_RARP: 1635 debug("Got RARP\n"); 1636 arp = (ARP_t *)ip; 1637 if (len < ARP_HDR_SIZE) { 1638 printf("bad length %d < %d\n", len, ARP_HDR_SIZE); 1639 return; 1640 } 1641 1642 if ((ntohs(arp->ar_op) != RARPOP_REPLY) || 1643 (ntohs(arp->ar_hrd) != ARP_ETHER) || 1644 (ntohs(arp->ar_pro) != PROT_IP) || 1645 (arp->ar_hln != 6) || (arp->ar_pln != 4)) { 1646 1647 puts("invalid RARP header\n"); 1648 } else { 1649 NetCopyIP(&NetOurIP, &arp->ar_data[16]); 1650 if (NetServerIP == 0) 1651 NetCopyIP(&NetServerIP, &arp->ar_data[6]); 1652 memcpy(NetServerEther, &arp->ar_data[0], 6); 1653 1654 (*packetHandler)(0, 0, 0, 0, 0); 1655 } 1656 break; 1657 #endif 1658 case PROT_IP: 1659 debug("Got IP\n"); 1660 /* Before we start poking the header, make sure it is there */ 1661 if (len < IP_HDR_SIZE) { 1662 debug("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE); 1663 return; 1664 } 1665 /* Check the packet length */ 1666 if (len < ntohs(ip->ip_len)) { 1667 printf("len bad %d < %d\n", len, ntohs(ip->ip_len)); 1668 return; 1669 } 1670 len = ntohs(ip->ip_len); 1671 debug("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff); 1672 1673 /* Can't deal with anything except IPv4 */ 1674 if ((ip->ip_hl_v & 0xf0) != 0x40) 1675 return; 1676 /* Can't deal with IP options (headers != 20 bytes) */ 1677 if ((ip->ip_hl_v & 0x0f) > 0x05) 1678 return; 1679 /* Check the Checksum of the header */ 1680 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) { 1681 puts("checksum bad\n"); 1682 return; 1683 } 1684 /* If it is not for us, ignore it */ 1685 tmp = NetReadIP(&ip->ip_dst); 1686 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) { 1687 #ifdef CONFIG_MCAST_TFTP 1688 if (Mcast_addr != tmp) 1689 #endif 1690 return; 1691 } 1692 /* Read source IP address for later use */ 1693 src_ip = NetReadIP(&ip->ip_src); 1694 /* 1695 * The function returns the unchanged packet if it's not 1696 * a fragment, and either the complete packet or NULL if 1697 * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL) 1698 */ 1699 ip = NetDefragment(ip, &len); 1700 if (!ip) 1701 return; 1702 /* 1703 * watch for ICMP host redirects 1704 * 1705 * There is no real handler code (yet). We just watch 1706 * for ICMP host redirect messages. In case anybody 1707 * sees these messages: please contact me 1708 * (wd@denx.de), or - even better - send me the 1709 * necessary fixes :-) 1710 * 1711 * Note: in all cases where I have seen this so far 1712 * it was a problem with the router configuration, 1713 * for instance when a router was configured in the 1714 * BOOTP reply, but the TFTP server was on the same 1715 * subnet. So this is probably a warning that your 1716 * configuration might be wrong. But I'm not really 1717 * sure if there aren't any other situations. 1718 * 1719 * Simon Glass <sjg@chromium.org>: We get an ICMP when 1720 * we send a tftp packet to a dead connection, or when 1721 * there is no server at the other end. 1722 */ 1723 if (ip->ip_p == IPPROTO_ICMP) { 1724 receive_icmp(ip, len, src_ip, et); 1725 return; 1726 } else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */ 1727 return; 1728 } 1729 1730 #ifdef CONFIG_UDP_CHECKSUM 1731 if (ip->udp_xsum != 0) { 1732 ulong xsum; 1733 ushort *sumptr; 1734 ushort sumlen; 1735 1736 xsum = ip->ip_p; 1737 xsum += (ntohs(ip->udp_len)); 1738 xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff; 1739 xsum += (ntohl(ip->ip_src) >> 0) & 0x0000ffff; 1740 xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff; 1741 xsum += (ntohl(ip->ip_dst) >> 0) & 0x0000ffff; 1742 1743 sumlen = ntohs(ip->udp_len); 1744 sumptr = (ushort *) &(ip->udp_src); 1745 1746 while (sumlen > 1) { 1747 ushort sumdata; 1748 1749 sumdata = *sumptr++; 1750 xsum += ntohs(sumdata); 1751 sumlen -= 2; 1752 } 1753 if (sumlen > 0) { 1754 ushort sumdata; 1755 1756 sumdata = *(unsigned char *) sumptr; 1757 sumdata = (sumdata << 8) & 0xff00; 1758 xsum += sumdata; 1759 } 1760 while ((xsum >> 16) != 0) { 1761 xsum = (xsum & 0x0000ffff) + 1762 ((xsum >> 16) & 0x0000ffff); 1763 } 1764 if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) { 1765 printf(" UDP wrong checksum %08lx %08x\n", 1766 xsum, ntohs(ip->udp_xsum)); 1767 return; 1768 } 1769 } 1770 #endif 1771 1772 1773 #ifdef CONFIG_NETCONSOLE 1774 nc_input_packet((uchar *)ip + IP_HDR_SIZE, 1775 ntohs(ip->udp_dst), 1776 ntohs(ip->udp_src), 1777 ntohs(ip->udp_len) - 8); 1778 #endif 1779 /* 1780 * IP header OK. Pass the packet to the current handler. 1781 */ 1782 (*packetHandler)((uchar *)ip + IP_HDR_SIZE, 1783 ntohs(ip->udp_dst), 1784 src_ip, 1785 ntohs(ip->udp_src), 1786 ntohs(ip->udp_len) - 8); 1787 break; 1788 } 1789 } 1790 1791 1792 /**********************************************************************/ 1793 1794 static int net_check_prereq(enum proto_t protocol) 1795 { 1796 switch (protocol) { 1797 /* Fall through */ 1798 #if defined(CONFIG_CMD_PING) 1799 case PING: 1800 if (NetPingIP == 0) { 1801 puts("*** ERROR: ping address not given\n"); 1802 return 1; 1803 } 1804 goto common; 1805 #endif 1806 #if defined(CONFIG_CMD_SNTP) 1807 case SNTP: 1808 if (NetNtpServerIP == 0) { 1809 puts("*** ERROR: NTP server address not given\n"); 1810 return 1; 1811 } 1812 goto common; 1813 #endif 1814 #if defined(CONFIG_CMD_DNS) 1815 case DNS: 1816 if (NetOurDNSIP == 0) { 1817 puts("*** ERROR: DNS server address not given\n"); 1818 return 1; 1819 } 1820 goto common; 1821 #endif 1822 #if defined(CONFIG_CMD_NFS) 1823 case NFS: 1824 #endif 1825 case TFTPGET: 1826 case TFTPPUT: 1827 if (NetServerIP == 0) { 1828 puts("*** ERROR: `serverip' not set\n"); 1829 return 1; 1830 } 1831 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \ 1832 defined(CONFIG_CMD_DNS) 1833 common: 1834 #endif 1835 /* Fall through */ 1836 1837 case NETCONS: 1838 case TFTPSRV: 1839 if (NetOurIP == 0) { 1840 puts("*** ERROR: `ipaddr' not set\n"); 1841 return 1; 1842 } 1843 /* Fall through */ 1844 1845 #ifdef CONFIG_CMD_RARP 1846 case RARP: 1847 #endif 1848 case BOOTP: 1849 case CDP: 1850 case DHCP: 1851 if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) { 1852 int num = eth_get_dev_index(); 1853 1854 switch (num) { 1855 case -1: 1856 puts("*** ERROR: No ethernet found.\n"); 1857 return 1; 1858 case 0: 1859 puts("*** ERROR: `ethaddr' not set\n"); 1860 break; 1861 default: 1862 printf("*** ERROR: `eth%daddr' not set\n", 1863 num); 1864 break; 1865 } 1866 1867 NetStartAgain(); 1868 return 2; 1869 } 1870 /* Fall through */ 1871 default: 1872 return 0; 1873 } 1874 return 0; /* OK */ 1875 } 1876 /**********************************************************************/ 1877 1878 int 1879 NetCksumOk(uchar *ptr, int len) 1880 { 1881 return !((NetCksum(ptr, len) + 1) & 0xfffe); 1882 } 1883 1884 1885 unsigned 1886 NetCksum(uchar *ptr, int len) 1887 { 1888 ulong xsum; 1889 ushort *p = (ushort *)ptr; 1890 1891 xsum = 0; 1892 while (len-- > 0) 1893 xsum += *p++; 1894 xsum = (xsum & 0xffff) + (xsum >> 16); 1895 xsum = (xsum & 0xffff) + (xsum >> 16); 1896 return xsum & 0xffff; 1897 } 1898 1899 int 1900 NetEthHdrSize(void) 1901 { 1902 ushort myvlanid; 1903 1904 myvlanid = ntohs(NetOurVLAN); 1905 if (myvlanid == (ushort)-1) 1906 myvlanid = VLAN_NONE; 1907 1908 return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : 1909 VLAN_ETHER_HDR_SIZE; 1910 } 1911 1912 int 1913 NetSetEther(uchar *xet, uchar * addr, uint prot) 1914 { 1915 Ethernet_t *et = (Ethernet_t *)xet; 1916 ushort myvlanid; 1917 1918 myvlanid = ntohs(NetOurVLAN); 1919 if (myvlanid == (ushort)-1) 1920 myvlanid = VLAN_NONE; 1921 1922 memcpy(et->et_dest, addr, 6); 1923 memcpy(et->et_src, NetOurEther, 6); 1924 if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) { 1925 et->et_protlen = htons(prot); 1926 return ETHER_HDR_SIZE; 1927 } else { 1928 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet; 1929 1930 vet->vet_vlan_type = htons(PROT_VLAN); 1931 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK)); 1932 vet->vet_type = htons(prot); 1933 return VLAN_ETHER_HDR_SIZE; 1934 } 1935 } 1936 1937 void 1938 NetSetIP(uchar *xip, IPaddr_t dest, int dport, int sport, int len) 1939 { 1940 IP_t *ip = (IP_t *)xip; 1941 1942 /* 1943 * If the data is an odd number of bytes, zero the 1944 * byte after the last byte so that the checksum 1945 * will work. 1946 */ 1947 if (len & 1) 1948 xip[IP_HDR_SIZE + len] = 0; 1949 1950 /* 1951 * Construct an IP and UDP header. 1952 * (need to set no fragment bit - XXX) 1953 */ 1954 /* IP_HDR_SIZE / 4 (not including UDP) */ 1955 ip->ip_hl_v = 0x45; 1956 ip->ip_tos = 0; 1957 ip->ip_len = htons(IP_HDR_SIZE + len); 1958 ip->ip_id = htons(NetIPID++); 1959 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ 1960 ip->ip_ttl = 255; 1961 ip->ip_p = 17; /* UDP */ 1962 ip->ip_sum = 0; 1963 /* already in network byte order */ 1964 NetCopyIP((void *)&ip->ip_src, &NetOurIP); 1965 /* - "" - */ 1966 NetCopyIP((void *)&ip->ip_dst, &dest); 1967 ip->udp_src = htons(sport); 1968 ip->udp_dst = htons(dport); 1969 ip->udp_len = htons(8 + len); 1970 ip->udp_xsum = 0; 1971 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2); 1972 } 1973 1974 void copy_filename(char *dst, const char *src, int size) 1975 { 1976 if (*src && (*src == '"')) { 1977 ++src; 1978 --size; 1979 } 1980 1981 while ((--size > 0) && *src && (*src != '"')) 1982 *dst++ = *src++; 1983 *dst = '\0'; 1984 } 1985 1986 #if defined(CONFIG_CMD_NFS) || \ 1987 defined(CONFIG_CMD_SNTP) || \ 1988 defined(CONFIG_CMD_DNS) 1989 /* 1990 * make port a little random (1024-17407) 1991 * This keeps the math somewhat trivial to compute, and seems to work with 1992 * all supported protocols/clients/servers 1993 */ 1994 unsigned int random_port(void) 1995 { 1996 return 1024 + (get_timer(0) % 0x4000); 1997 } 1998 #endif 1999 2000 void ip_to_string(IPaddr_t x, char *s) 2001 { 2002 x = ntohl(x); 2003 sprintf(s, "%d.%d.%d.%d", 2004 (int) ((x >> 24) & 0xff), 2005 (int) ((x >> 16) & 0xff), 2006 (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff) 2007 ); 2008 } 2009 2010 void VLAN_to_string(ushort x, char *s) 2011 { 2012 x = ntohs(x); 2013 2014 if (x == (ushort)-1) 2015 x = VLAN_NONE; 2016 2017 if (x == VLAN_NONE) 2018 strcpy(s, "none"); 2019 else 2020 sprintf(s, "%d", x & VLAN_IDMASK); 2021 } 2022 2023 ushort string_to_VLAN(const char *s) 2024 { 2025 ushort id; 2026 2027 if (s == NULL) 2028 return htons(VLAN_NONE); 2029 2030 if (*s < '0' || *s > '9') 2031 id = VLAN_NONE; 2032 else 2033 id = (ushort)simple_strtoul(s, NULL, 10); 2034 2035 return htons(id); 2036 } 2037 2038 ushort getenv_VLAN(char *var) 2039 { 2040 return string_to_VLAN(getenv(var)); 2041 } 2042