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