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 if (!NetArpWaitTxPacket) { 375 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1); 376 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN; 377 NetArpWaitTxPacketSize = 0; 378 } 379 380 eth_halt(); 381 #ifdef CONFIG_NET_MULTI 382 eth_set_current(); 383 #endif 384 if (eth_init(bd) < 0) { 385 eth_halt(); 386 return -1; 387 } 388 389 restart: 390 #ifdef CONFIG_NET_MULTI 391 memcpy(NetOurEther, eth_get_dev()->enetaddr, 6); 392 #else 393 eth_getenv_enetaddr("ethaddr", NetOurEther); 394 #endif 395 396 NetState = NETLOOP_CONTINUE; 397 398 /* 399 * Start the ball rolling with the given start function. From 400 * here on, this code is a state machine driven by received 401 * packets and timer events. 402 */ 403 NetInitLoop(protocol); 404 405 switch (net_check_prereq(protocol)) { 406 case 1: 407 /* network not configured */ 408 eth_halt(); 409 return -1; 410 411 #ifdef CONFIG_NET_MULTI 412 case 2: 413 /* network device not configured */ 414 break; 415 #endif /* CONFIG_NET_MULTI */ 416 417 case 0: 418 #ifdef CONFIG_NET_MULTI 419 NetDevExists = 1; 420 #endif 421 switch (protocol) { 422 case TFTP: 423 /* always use ARP to get server ethernet address */ 424 TftpStart(); 425 break; 426 #ifdef CONFIG_CMD_TFTPSRV 427 case TFTPSRV: 428 TftpStartServer(); 429 break; 430 #endif 431 #if defined(CONFIG_CMD_DHCP) 432 case DHCP: 433 BootpTry = 0; 434 NetOurIP = 0; 435 DhcpRequest(); /* Basically same as BOOTP */ 436 break; 437 #endif 438 439 case BOOTP: 440 BootpTry = 0; 441 NetOurIP = 0; 442 BootpRequest(); 443 break; 444 445 #if defined(CONFIG_CMD_RARP) 446 case RARP: 447 RarpTry = 0; 448 NetOurIP = 0; 449 RarpRequest(); 450 break; 451 #endif 452 #if defined(CONFIG_CMD_PING) 453 case PING: 454 PingStart(); 455 break; 456 #endif 457 #if defined(CONFIG_CMD_NFS) 458 case NFS: 459 NfsStart(); 460 break; 461 #endif 462 #if defined(CONFIG_CMD_CDP) 463 case CDP: 464 CDPStart(); 465 break; 466 #endif 467 #ifdef CONFIG_NETCONSOLE 468 case NETCONS: 469 NcStart(); 470 break; 471 #endif 472 #if defined(CONFIG_CMD_SNTP) 473 case SNTP: 474 SntpStart(); 475 break; 476 #endif 477 #if defined(CONFIG_CMD_DNS) 478 case DNS: 479 DnsStart(); 480 break; 481 #endif 482 default: 483 break; 484 } 485 486 NetBootFileXferSize = 0; 487 break; 488 } 489 490 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 491 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ 492 defined(CONFIG_STATUS_LED) && \ 493 defined(STATUS_LED_RED) 494 /* 495 * Echo the inverted link state to the fault LED. 496 */ 497 if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) 498 status_led_set(STATUS_LED_RED, STATUS_LED_OFF); 499 else 500 status_led_set(STATUS_LED_RED, STATUS_LED_ON); 501 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 502 #endif /* CONFIG_MII, ... */ 503 504 /* 505 * Main packet reception loop. Loop receiving packets until 506 * someone sets `NetState' to a state that terminates. 507 */ 508 for (;;) { 509 WATCHDOG_RESET(); 510 #ifdef CONFIG_SHOW_ACTIVITY 511 { 512 extern void show_activity(int arg); 513 show_activity(1); 514 } 515 #endif 516 /* 517 * Check the ethernet for a new packet. The ethernet 518 * receive routine will process it. 519 */ 520 eth_rx(); 521 522 /* 523 * Abort if ctrl-c was pressed. 524 */ 525 if (ctrlc()) { 526 eth_halt(); 527 puts("\nAbort\n"); 528 return -1; 529 } 530 531 ArpTimeoutCheck(); 532 533 /* 534 * Check for a timeout, and run the timeout handler 535 * if we have one. 536 */ 537 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) { 538 thand_f *x; 539 540 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 541 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ 542 defined(CONFIG_STATUS_LED) && \ 543 defined(STATUS_LED_RED) 544 /* 545 * Echo the inverted link state to the fault LED. 546 */ 547 if (miiphy_link(eth_get_dev()->name, 548 CONFIG_SYS_FAULT_MII_ADDR)) { 549 status_led_set(STATUS_LED_RED, STATUS_LED_OFF); 550 } else { 551 status_led_set(STATUS_LED_RED, STATUS_LED_ON); 552 } 553 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 554 #endif /* CONFIG_MII, ... */ 555 x = timeHandler; 556 timeHandler = (thand_f *)0; 557 (*x)(); 558 } 559 560 561 switch (NetState) { 562 563 case NETLOOP_RESTART: 564 #ifdef CONFIG_NET_MULTI 565 NetRestarted = 1; 566 #endif 567 goto restart; 568 569 case NETLOOP_SUCCESS: 570 if (NetBootFileXferSize > 0) { 571 char buf[20]; 572 printf("Bytes transferred = %ld (%lx hex)\n", 573 NetBootFileXferSize, 574 NetBootFileXferSize); 575 sprintf(buf, "%lX", NetBootFileXferSize); 576 setenv("filesize", buf); 577 578 sprintf(buf, "%lX", (unsigned long)load_addr); 579 setenv("fileaddr", buf); 580 } 581 eth_halt(); 582 return NetBootFileXferSize; 583 584 case NETLOOP_FAIL: 585 return -1; 586 } 587 } 588 } 589 590 /**********************************************************************/ 591 592 static void 593 startAgainTimeout(void) 594 { 595 NetState = NETLOOP_RESTART; 596 } 597 598 static void 599 startAgainHandler(uchar *pkt, unsigned dest, IPaddr_t sip, 600 unsigned src, unsigned len) 601 { 602 /* Totally ignore the packet */ 603 } 604 605 void NetStartAgain(void) 606 { 607 char *nretry; 608 int retry_forever = 0; 609 unsigned long retrycnt = 0; 610 611 nretry = getenv("netretry"); 612 if (nretry) { 613 if (!strcmp(nretry, "yes")) 614 retry_forever = 1; 615 else if (!strcmp(nretry, "no")) 616 retrycnt = 0; 617 else if (!strcmp(nretry, "once")) 618 retrycnt = 1; 619 else 620 retrycnt = simple_strtoul(nretry, NULL, 0); 621 } else 622 retry_forever = 1; 623 624 if ((!retry_forever) && (NetTryCount >= retrycnt)) { 625 eth_halt(); 626 NetState = NETLOOP_FAIL; 627 return; 628 } 629 630 NetTryCount++; 631 632 #ifndef CONFIG_NET_MULTI 633 NetSetTimeout(10000UL, startAgainTimeout); 634 NetSetHandler(startAgainHandler); 635 #else /* !CONFIG_NET_MULTI*/ 636 eth_halt(); 637 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER) 638 eth_try_another(!NetRestarted); 639 #endif 640 eth_init(gd->bd); 641 if (NetRestartWrap) { 642 NetRestartWrap = 0; 643 if (NetDevExists) { 644 NetSetTimeout(10000UL, startAgainTimeout); 645 NetSetHandler(startAgainHandler); 646 } else { 647 NetState = NETLOOP_FAIL; 648 } 649 } else { 650 NetState = NETLOOP_RESTART; 651 } 652 #endif /* CONFIG_NET_MULTI */ 653 } 654 655 /**********************************************************************/ 656 /* 657 * Miscelaneous bits. 658 */ 659 660 void 661 NetSetHandler(rxhand_f *f) 662 { 663 packetHandler = f; 664 } 665 666 667 void 668 NetSetTimeout(ulong iv, thand_f *f) 669 { 670 if (iv == 0) { 671 timeHandler = (thand_f *)0; 672 } else { 673 timeHandler = f; 674 timeStart = get_timer(0); 675 timeDelta = iv; 676 } 677 } 678 679 680 void 681 NetSendPacket(volatile uchar *pkt, int len) 682 { 683 (void) eth_send(pkt, len); 684 } 685 686 int 687 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len) 688 { 689 uchar *pkt; 690 691 /* convert to new style broadcast */ 692 if (dest == 0) 693 dest = 0xFFFFFFFF; 694 695 /* if broadcast, make the ether address a broadcast and don't do ARP */ 696 if (dest == 0xFFFFFFFF) 697 ether = NetBcastAddr; 698 699 /* 700 * if MAC address was not discovered yet, save the packet and do 701 * an ARP request 702 */ 703 if (memcmp(ether, NetEtherNullAddr, 6) == 0) { 704 705 debug("sending ARP for %08lx\n", dest); 706 707 NetArpWaitPacketIP = dest; 708 NetArpWaitPacketMAC = ether; 709 710 pkt = NetArpWaitTxPacket; 711 pkt += NetSetEther(pkt, NetArpWaitPacketMAC, PROT_IP); 712 713 NetSetIP(pkt, dest, dport, sport, len); 714 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + 715 (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len); 716 717 /* size of the waiting packet */ 718 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + 719 IP_HDR_SIZE + len; 720 721 /* and do the ARP request */ 722 NetArpWaitTry = 1; 723 NetArpWaitTimerStart = get_timer(0); 724 ArpRequest(); 725 return 1; /* waiting */ 726 } 727 728 debug("sending UDP to %08lx/%pM\n", dest, ether); 729 730 pkt = (uchar *)NetTxPacket; 731 pkt += NetSetEther(pkt, ether, PROT_IP); 732 NetSetIP(pkt, dest, dport, sport, len); 733 (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len); 734 735 return 0; /* transmitted */ 736 } 737 738 #if defined(CONFIG_CMD_PING) 739 static ushort PingSeqNo; 740 741 int PingSend(void) 742 { 743 static uchar mac[6]; 744 volatile IP_t *ip; 745 volatile ushort *s; 746 uchar *pkt; 747 748 /* XXX always send arp request */ 749 750 memcpy(mac, NetEtherNullAddr, 6); 751 752 debug("sending ARP for %08lx\n", NetPingIP); 753 754 NetArpWaitPacketIP = NetPingIP; 755 NetArpWaitPacketMAC = mac; 756 757 pkt = NetArpWaitTxPacket; 758 pkt += NetSetEther(pkt, mac, PROT_IP); 759 760 ip = (volatile IP_t *)pkt; 761 762 /* 763 * Construct an IP and ICMP header. 764 * (need to set no fragment bit - XXX) 765 */ 766 /* IP_HDR_SIZE / 4 (not including UDP) */ 767 ip->ip_hl_v = 0x45; 768 ip->ip_tos = 0; 769 ip->ip_len = htons(IP_HDR_SIZE_NO_UDP + 8); 770 ip->ip_id = htons(NetIPID++); 771 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ 772 ip->ip_ttl = 255; 773 ip->ip_p = 0x01; /* ICMP */ 774 ip->ip_sum = 0; 775 /* already in network byte order */ 776 NetCopyIP((void *)&ip->ip_src, &NetOurIP); 777 /* - "" - */ 778 NetCopyIP((void *)&ip->ip_dst, &NetPingIP); 779 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2); 780 781 s = &ip->udp_src; /* XXX ICMP starts here */ 782 s[0] = htons(0x0800); /* echo-request, code */ 783 s[1] = 0; /* checksum */ 784 s[2] = 0; /* identifier */ 785 s[3] = htons(PingSeqNo++); /* sequence number */ 786 s[1] = ~NetCksum((uchar *)s, 8/2); 787 788 /* size of the waiting packet */ 789 NetArpWaitTxPacketSize = 790 (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8; 791 792 /* and do the ARP request */ 793 NetArpWaitTry = 1; 794 NetArpWaitTimerStart = get_timer(0); 795 ArpRequest(); 796 return 1; /* waiting */ 797 } 798 799 static void 800 PingTimeout(void) 801 { 802 eth_halt(); 803 NetState = NETLOOP_FAIL; /* we did not get the reply */ 804 } 805 806 static void 807 PingHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 808 unsigned len) 809 { 810 if (sip != NetPingIP) 811 return; 812 813 NetState = NETLOOP_SUCCESS; 814 } 815 816 static void PingStart(void) 817 { 818 #if defined(CONFIG_NET_MULTI) 819 printf("Using %s device\n", eth_get_name()); 820 #endif /* CONFIG_NET_MULTI */ 821 NetSetTimeout(10000UL, PingTimeout); 822 NetSetHandler(PingHandler); 823 824 PingSend(); 825 } 826 #endif 827 828 #if defined(CONFIG_CMD_CDP) 829 830 #define CDP_DEVICE_ID_TLV 0x0001 831 #define CDP_ADDRESS_TLV 0x0002 832 #define CDP_PORT_ID_TLV 0x0003 833 #define CDP_CAPABILITIES_TLV 0x0004 834 #define CDP_VERSION_TLV 0x0005 835 #define CDP_PLATFORM_TLV 0x0006 836 #define CDP_NATIVE_VLAN_TLV 0x000a 837 #define CDP_APPLIANCE_VLAN_TLV 0x000e 838 #define CDP_TRIGGER_TLV 0x000f 839 #define CDP_POWER_CONSUMPTION_TLV 0x0010 840 #define CDP_SYSNAME_TLV 0x0014 841 #define CDP_SYSOBJECT_TLV 0x0015 842 #define CDP_MANAGEMENT_ADDRESS_TLV 0x0016 843 844 #define CDP_TIMEOUT 250UL /* one packet every 250ms */ 845 846 static int CDPSeq; 847 static int CDPOK; 848 849 ushort CDPNativeVLAN; 850 ushort CDPApplianceVLAN; 851 852 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 853 0x00 }; 854 855 static ushort CDP_compute_csum(const uchar *buff, ushort len) 856 { 857 ushort csum; 858 int odd; 859 ulong result = 0; 860 ushort leftover; 861 ushort *p; 862 863 if (len > 0) { 864 odd = 1 & (ulong)buff; 865 if (odd) { 866 result = *buff << 8; 867 len--; 868 buff++; 869 } 870 while (len > 1) { 871 p = (ushort *)buff; 872 result += *p++; 873 buff = (uchar *)p; 874 if (result & 0x80000000) 875 result = (result & 0xFFFF) + (result >> 16); 876 len -= 2; 877 } 878 if (len) { 879 leftover = (signed short)(*(const signed char *)buff); 880 /* CISCO SUCKS big time! (and blows too): 881 * CDP uses the IP checksum algorithm with a twist; 882 * for the last byte it *sign* extends and sums. 883 */ 884 result = (result & 0xffff0000) | 885 ((result + leftover) & 0x0000ffff); 886 } 887 while (result >> 16) 888 result = (result & 0xFFFF) + (result >> 16); 889 890 if (odd) 891 result = ((result >> 8) & 0xff) | 892 ((result & 0xff) << 8); 893 } 894 895 /* add up 16-bit and 17-bit words for 17+c bits */ 896 result = (result & 0xffff) + (result >> 16); 897 /* add up 16-bit and 2-bit for 16+c bit */ 898 result = (result & 0xffff) + (result >> 16); 899 /* add up carry.. */ 900 result = (result & 0xffff) + (result >> 16); 901 902 /* negate */ 903 csum = ~(ushort)result; 904 905 /* run time endian detection */ 906 if (csum != htons(csum)) /* little endian */ 907 csum = htons(csum); 908 909 return csum; 910 } 911 912 int CDPSendTrigger(void) 913 { 914 volatile uchar *pkt; 915 volatile ushort *s; 916 volatile ushort *cp; 917 Ethernet_t *et; 918 int len; 919 ushort chksum; 920 #if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID) || \ 921 defined(CONFIG_CDP_VERSION) || defined(CONFIG_CDP_PLATFORM) 922 char buf[32]; 923 #endif 924 925 pkt = NetTxPacket; 926 et = (Ethernet_t *)pkt; 927 928 /* NOTE: trigger sent not on any VLAN */ 929 930 /* form ethernet header */ 931 memcpy(et->et_dest, NetCDPAddr, 6); 932 memcpy(et->et_src, NetOurEther, 6); 933 934 pkt += ETHER_HDR_SIZE; 935 936 /* SNAP header */ 937 memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)); 938 pkt += sizeof(CDP_SNAP_hdr); 939 940 /* CDP header */ 941 *pkt++ = 0x02; /* CDP version 2 */ 942 *pkt++ = 180; /* TTL */ 943 s = (volatile ushort *)pkt; 944 cp = s; 945 /* checksum (0 for later calculation) */ 946 *s++ = htons(0); 947 948 /* CDP fields */ 949 #ifdef CONFIG_CDP_DEVICE_ID 950 *s++ = htons(CDP_DEVICE_ID_TLV); 951 *s++ = htons(CONFIG_CDP_DEVICE_ID); 952 sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%pm", NetOurEther); 953 memcpy((uchar *)s, buf, 16); 954 s += 16 / 2; 955 #endif 956 957 #ifdef CONFIG_CDP_PORT_ID 958 *s++ = htons(CDP_PORT_ID_TLV); 959 memset(buf, 0, sizeof(buf)); 960 sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index()); 961 len = strlen(buf); 962 if (len & 1) /* make it even */ 963 len++; 964 *s++ = htons(len + 4); 965 memcpy((uchar *)s, buf, len); 966 s += len / 2; 967 #endif 968 969 #ifdef CONFIG_CDP_CAPABILITIES 970 *s++ = htons(CDP_CAPABILITIES_TLV); 971 *s++ = htons(8); 972 *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES); 973 s += 2; 974 #endif 975 976 #ifdef CONFIG_CDP_VERSION 977 *s++ = htons(CDP_VERSION_TLV); 978 memset(buf, 0, sizeof(buf)); 979 strcpy(buf, CONFIG_CDP_VERSION); 980 len = strlen(buf); 981 if (len & 1) /* make it even */ 982 len++; 983 *s++ = htons(len + 4); 984 memcpy((uchar *)s, buf, len); 985 s += len / 2; 986 #endif 987 988 #ifdef CONFIG_CDP_PLATFORM 989 *s++ = htons(CDP_PLATFORM_TLV); 990 memset(buf, 0, sizeof(buf)); 991 strcpy(buf, CONFIG_CDP_PLATFORM); 992 len = strlen(buf); 993 if (len & 1) /* make it even */ 994 len++; 995 *s++ = htons(len + 4); 996 memcpy((uchar *)s, buf, len); 997 s += len / 2; 998 #endif 999 1000 #ifdef CONFIG_CDP_TRIGGER 1001 *s++ = htons(CDP_TRIGGER_TLV); 1002 *s++ = htons(8); 1003 *(ulong *)s = htonl(CONFIG_CDP_TRIGGER); 1004 s += 2; 1005 #endif 1006 1007 #ifdef CONFIG_CDP_POWER_CONSUMPTION 1008 *s++ = htons(CDP_POWER_CONSUMPTION_TLV); 1009 *s++ = htons(6); 1010 *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION); 1011 #endif 1012 1013 /* length of ethernet packet */ 1014 len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE); 1015 et->et_protlen = htons(len); 1016 1017 len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr); 1018 chksum = CDP_compute_csum((uchar *)NetTxPacket + len, 1019 (uchar *)s - (NetTxPacket + len)); 1020 if (chksum == 0) 1021 chksum = 0xFFFF; 1022 *cp = htons(chksum); 1023 1024 (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket); 1025 return 0; 1026 } 1027 1028 static void 1029 CDPTimeout(void) 1030 { 1031 CDPSeq++; 1032 1033 if (CDPSeq < 3) { 1034 NetSetTimeout(CDP_TIMEOUT, CDPTimeout); 1035 CDPSendTrigger(); 1036 return; 1037 } 1038 1039 /* if not OK try again */ 1040 if (!CDPOK) 1041 NetStartAgain(); 1042 else 1043 NetState = NETLOOP_SUCCESS; 1044 } 1045 1046 static void 1047 CDPDummyHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 1048 unsigned len) 1049 { 1050 /* nothing */ 1051 } 1052 1053 static void 1054 CDPHandler(const uchar *pkt, unsigned len) 1055 { 1056 const uchar *t; 1057 const ushort *ss; 1058 ushort type, tlen; 1059 uchar applid; 1060 ushort vlan, nvlan; 1061 1062 /* minimum size? */ 1063 if (len < sizeof(CDP_SNAP_hdr) + 4) 1064 goto pkt_short; 1065 1066 /* check for valid CDP SNAP header */ 1067 if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0) 1068 return; 1069 1070 pkt += sizeof(CDP_SNAP_hdr); 1071 len -= sizeof(CDP_SNAP_hdr); 1072 1073 /* Version of CDP protocol must be >= 2 and TTL != 0 */ 1074 if (pkt[0] < 0x02 || pkt[1] == 0) 1075 return; 1076 1077 /* 1078 * if version is greater than 0x02 maybe we'll have a problem; 1079 * output a warning 1080 */ 1081 if (pkt[0] != 0x02) 1082 printf("** WARNING: CDP packet received with a protocol version %d > 2\n", 1083 pkt[0] & 0xff); 1084 1085 if (CDP_compute_csum(pkt, len) != 0) 1086 return; 1087 1088 pkt += 4; 1089 len -= 4; 1090 1091 vlan = htons(-1); 1092 nvlan = htons(-1); 1093 while (len > 0) { 1094 if (len < 4) 1095 goto pkt_short; 1096 1097 ss = (const ushort *)pkt; 1098 type = ntohs(ss[0]); 1099 tlen = ntohs(ss[1]); 1100 if (tlen > len) 1101 goto pkt_short; 1102 1103 pkt += tlen; 1104 len -= tlen; 1105 1106 ss += 2; /* point ss to the data of the TLV */ 1107 tlen -= 4; 1108 1109 switch (type) { 1110 case CDP_DEVICE_ID_TLV: 1111 break; 1112 case CDP_ADDRESS_TLV: 1113 break; 1114 case CDP_PORT_ID_TLV: 1115 break; 1116 case CDP_CAPABILITIES_TLV: 1117 break; 1118 case CDP_VERSION_TLV: 1119 break; 1120 case CDP_PLATFORM_TLV: 1121 break; 1122 case CDP_NATIVE_VLAN_TLV: 1123 nvlan = *ss; 1124 break; 1125 case CDP_APPLIANCE_VLAN_TLV: 1126 t = (const uchar *)ss; 1127 while (tlen > 0) { 1128 if (tlen < 3) 1129 goto pkt_short; 1130 1131 applid = t[0]; 1132 ss = (const ushort *)(t + 1); 1133 1134 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE 1135 if (applid == 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 if (ntohs(arp->ar_pro) != PROT_IP) 1483 return; 1484 if (arp->ar_hln != 6) 1485 return; 1486 if (arp->ar_pln != 4) 1487 return; 1488 1489 if (NetOurIP == 0) 1490 return; 1491 1492 if (NetReadIP(&arp->ar_data[16]) != NetOurIP) 1493 return; 1494 1495 switch (ntohs(arp->ar_op)) { 1496 case ARPOP_REQUEST: 1497 /* reply with our IP address */ 1498 debug("Got ARP REQUEST, return our IP\n"); 1499 pkt = (uchar *)et; 1500 pkt += NetSetEther(pkt, et->et_src, PROT_ARP); 1501 arp->ar_op = htons(ARPOP_REPLY); 1502 memcpy(&arp->ar_data[10], &arp->ar_data[0], 6); 1503 NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]); 1504 memcpy(&arp->ar_data[0], NetOurEther, 6); 1505 NetCopyIP(&arp->ar_data[6], &NetOurIP); 1506 (void) eth_send((uchar *)et, 1507 (pkt - (uchar *)et) + ARP_HDR_SIZE); 1508 return; 1509 1510 case ARPOP_REPLY: /* arp reply */ 1511 /* are we waiting for a reply */ 1512 if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC) 1513 break; 1514 1515 #ifdef CONFIG_KEEP_SERVERADDR 1516 if (NetServerIP == NetArpWaitPacketIP) { 1517 char buf[20]; 1518 sprintf(buf, "%pM", arp->ar_data); 1519 setenv("serveraddr", buf); 1520 } 1521 #endif 1522 1523 debug("Got ARP REPLY, set server/gtwy eth addr (%pM)\n", 1524 arp->ar_data); 1525 1526 tmp = NetReadIP(&arp->ar_data[6]); 1527 1528 /* matched waiting packet's address */ 1529 if (tmp == NetArpWaitReplyIP) { 1530 debug("Got it\n"); 1531 /* save address for later use */ 1532 memcpy(NetArpWaitPacketMAC, 1533 &arp->ar_data[0], 6); 1534 1535 #ifdef CONFIG_NETCONSOLE 1536 (*packetHandler)(0, 0, 0, 0, 0); 1537 #endif 1538 /* modify header, and transmit it */ 1539 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6); 1540 (void) eth_send(NetArpWaitTxPacket, 1541 NetArpWaitTxPacketSize); 1542 1543 /* no arp request pending now */ 1544 NetArpWaitPacketIP = 0; 1545 NetArpWaitTxPacketSize = 0; 1546 NetArpWaitPacketMAC = NULL; 1547 1548 } 1549 return; 1550 default: 1551 debug("Unexpected ARP opcode 0x%x\n", 1552 ntohs(arp->ar_op)); 1553 return; 1554 } 1555 break; 1556 1557 #ifdef CONFIG_CMD_RARP 1558 case PROT_RARP: 1559 debug("Got RARP\n"); 1560 arp = (ARP_t *)ip; 1561 if (len < ARP_HDR_SIZE) { 1562 printf("bad length %d < %d\n", len, ARP_HDR_SIZE); 1563 return; 1564 } 1565 1566 if ((ntohs(arp->ar_op) != RARPOP_REPLY) || 1567 (ntohs(arp->ar_hrd) != ARP_ETHER) || 1568 (ntohs(arp->ar_pro) != PROT_IP) || 1569 (arp->ar_hln != 6) || (arp->ar_pln != 4)) { 1570 1571 puts("invalid RARP header\n"); 1572 } else { 1573 NetCopyIP(&NetOurIP, &arp->ar_data[16]); 1574 if (NetServerIP == 0) 1575 NetCopyIP(&NetServerIP, &arp->ar_data[6]); 1576 memcpy(NetServerEther, &arp->ar_data[0], 6); 1577 1578 (*packetHandler)(0, 0, 0, 0, 0); 1579 } 1580 break; 1581 #endif 1582 case PROT_IP: 1583 debug("Got IP\n"); 1584 /* Before we start poking the header, make sure it is there */ 1585 if (len < IP_HDR_SIZE) { 1586 debug("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE); 1587 return; 1588 } 1589 /* Check the packet length */ 1590 if (len < ntohs(ip->ip_len)) { 1591 printf("len bad %d < %d\n", len, ntohs(ip->ip_len)); 1592 return; 1593 } 1594 len = ntohs(ip->ip_len); 1595 debug("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff); 1596 1597 /* Can't deal with anything except IPv4 */ 1598 if ((ip->ip_hl_v & 0xf0) != 0x40) 1599 return; 1600 /* Can't deal with IP options (headers != 20 bytes) */ 1601 if ((ip->ip_hl_v & 0x0f) > 0x05) 1602 return; 1603 /* Check the Checksum of the header */ 1604 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) { 1605 puts("checksum bad\n"); 1606 return; 1607 } 1608 /* If it is not for us, ignore it */ 1609 tmp = NetReadIP(&ip->ip_dst); 1610 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) { 1611 #ifdef CONFIG_MCAST_TFTP 1612 if (Mcast_addr != tmp) 1613 #endif 1614 return; 1615 } 1616 /* Read source IP address for later use */ 1617 src_ip = NetReadIP(&ip->ip_src); 1618 /* 1619 * The function returns the unchanged packet if it's not 1620 * a fragment, and either the complete packet or NULL if 1621 * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL) 1622 */ 1623 ip = NetDefragment(ip, &len); 1624 if (!ip) 1625 return; 1626 /* 1627 * watch for ICMP host redirects 1628 * 1629 * There is no real handler code (yet). We just watch 1630 * for ICMP host redirect messages. In case anybody 1631 * sees these messages: please contact me 1632 * (wd@denx.de), or - even better - send me the 1633 * necessary fixes :-) 1634 * 1635 * Note: in all cases where I have seen this so far 1636 * it was a problem with the router configuration, 1637 * for instance when a router was configured in the 1638 * BOOTP reply, but the TFTP server was on the same 1639 * subnet. So this is probably a warning that your 1640 * configuration might be wrong. But I'm not really 1641 * sure if there aren't any other situations. 1642 */ 1643 if (ip->ip_p == IPPROTO_ICMP) { 1644 ICMP_t *icmph = (ICMP_t *)&(ip->udp_src); 1645 1646 switch (icmph->type) { 1647 case ICMP_REDIRECT: 1648 if (icmph->code != ICMP_REDIR_HOST) 1649 return; 1650 printf(" ICMP Host Redirect to %pI4 ", 1651 &icmph->un.gateway); 1652 return; 1653 #if defined(CONFIG_CMD_PING) 1654 case ICMP_ECHO_REPLY: 1655 /* 1656 * IP header OK. Pass the packet to the 1657 * current handler. 1658 */ 1659 /* XXX point to ip packet */ 1660 (*packetHandler)((uchar *)ip, 0, src_ip, 0, 0); 1661 return; 1662 case ICMP_ECHO_REQUEST: 1663 debug("Got ICMP ECHO REQUEST, return %d bytes\n", 1664 ETHER_HDR_SIZE + len); 1665 1666 memcpy(&et->et_dest[0], &et->et_src[0], 6); 1667 memcpy(&et->et_src[0], NetOurEther, 6); 1668 1669 ip->ip_sum = 0; 1670 ip->ip_off = 0; 1671 NetCopyIP((void *)&ip->ip_dst, &ip->ip_src); 1672 NetCopyIP((void *)&ip->ip_src, &NetOurIP); 1673 ip->ip_sum = ~NetCksum((uchar *)ip, 1674 IP_HDR_SIZE_NO_UDP >> 1); 1675 1676 icmph->type = ICMP_ECHO_REPLY; 1677 icmph->checksum = 0; 1678 icmph->checksum = ~NetCksum((uchar *)icmph, 1679 (len - IP_HDR_SIZE_NO_UDP) >> 1); 1680 (void) eth_send((uchar *)et, 1681 ETHER_HDR_SIZE + len); 1682 return; 1683 #endif 1684 default: 1685 return; 1686 } 1687 } else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */ 1688 return; 1689 } 1690 1691 #ifdef CONFIG_UDP_CHECKSUM 1692 if (ip->udp_xsum != 0) { 1693 ulong xsum; 1694 ushort *sumptr; 1695 ushort sumlen; 1696 1697 xsum = ip->ip_p; 1698 xsum += (ntohs(ip->udp_len)); 1699 xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff; 1700 xsum += (ntohl(ip->ip_src) >> 0) & 0x0000ffff; 1701 xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff; 1702 xsum += (ntohl(ip->ip_dst) >> 0) & 0x0000ffff; 1703 1704 sumlen = ntohs(ip->udp_len); 1705 sumptr = (ushort *) &(ip->udp_src); 1706 1707 while (sumlen > 1) { 1708 ushort sumdata; 1709 1710 sumdata = *sumptr++; 1711 xsum += ntohs(sumdata); 1712 sumlen -= 2; 1713 } 1714 if (sumlen > 0) { 1715 ushort sumdata; 1716 1717 sumdata = *(unsigned char *) sumptr; 1718 sumdata = (sumdata << 8) & 0xff00; 1719 xsum += sumdata; 1720 } 1721 while ((xsum >> 16) != 0) { 1722 xsum = (xsum & 0x0000ffff) + 1723 ((xsum >> 16) & 0x0000ffff); 1724 } 1725 if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) { 1726 printf(" UDP wrong checksum %08lx %08x\n", 1727 xsum, ntohs(ip->udp_xsum)); 1728 return; 1729 } 1730 } 1731 #endif 1732 1733 1734 #ifdef CONFIG_NETCONSOLE 1735 nc_input_packet((uchar *)ip + IP_HDR_SIZE, 1736 ntohs(ip->udp_dst), 1737 ntohs(ip->udp_src), 1738 ntohs(ip->udp_len) - 8); 1739 #endif 1740 /* 1741 * IP header OK. Pass the packet to the current handler. 1742 */ 1743 (*packetHandler)((uchar *)ip + IP_HDR_SIZE, 1744 ntohs(ip->udp_dst), 1745 src_ip, 1746 ntohs(ip->udp_src), 1747 ntohs(ip->udp_len) - 8); 1748 break; 1749 } 1750 } 1751 1752 1753 /**********************************************************************/ 1754 1755 static int net_check_prereq(proto_t protocol) 1756 { 1757 switch (protocol) { 1758 /* Fall through */ 1759 #if defined(CONFIG_CMD_PING) 1760 case PING: 1761 if (NetPingIP == 0) { 1762 puts("*** ERROR: ping address not given\n"); 1763 return 1; 1764 } 1765 goto common; 1766 #endif 1767 #if defined(CONFIG_CMD_SNTP) 1768 case SNTP: 1769 if (NetNtpServerIP == 0) { 1770 puts("*** ERROR: NTP server address not given\n"); 1771 return 1; 1772 } 1773 goto common; 1774 #endif 1775 #if defined(CONFIG_CMD_DNS) 1776 case DNS: 1777 if (NetOurDNSIP == 0) { 1778 puts("*** ERROR: DNS server address not given\n"); 1779 return 1; 1780 } 1781 goto common; 1782 #endif 1783 #if defined(CONFIG_CMD_NFS) 1784 case NFS: 1785 #endif 1786 case TFTP: 1787 if (NetServerIP == 0) { 1788 puts("*** ERROR: `serverip' not set\n"); 1789 return 1; 1790 } 1791 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \ 1792 defined(CONFIG_CMD_DNS) 1793 common: 1794 #endif 1795 /* Fall through */ 1796 1797 case NETCONS: 1798 case TFTPSRV: 1799 if (NetOurIP == 0) { 1800 puts("*** ERROR: `ipaddr' not set\n"); 1801 return 1; 1802 } 1803 /* Fall through */ 1804 1805 #ifdef CONFIG_CMD_RARP 1806 case RARP: 1807 #endif 1808 case BOOTP: 1809 case CDP: 1810 case DHCP: 1811 if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) { 1812 #ifdef CONFIG_NET_MULTI 1813 extern int eth_get_dev_index(void); 1814 int num = eth_get_dev_index(); 1815 1816 switch (num) { 1817 case -1: 1818 puts("*** ERROR: No ethernet found.\n"); 1819 return 1; 1820 case 0: 1821 puts("*** ERROR: `ethaddr' not set\n"); 1822 break; 1823 default: 1824 printf("*** ERROR: `eth%daddr' not set\n", 1825 num); 1826 break; 1827 } 1828 1829 NetStartAgain(); 1830 return 2; 1831 #else 1832 puts("*** ERROR: `ethaddr' not set\n"); 1833 return 1; 1834 #endif 1835 } 1836 /* Fall through */ 1837 default: 1838 return 0; 1839 } 1840 return 0; /* OK */ 1841 } 1842 /**********************************************************************/ 1843 1844 int 1845 NetCksumOk(uchar *ptr, int len) 1846 { 1847 return !((NetCksum(ptr, len) + 1) & 0xfffe); 1848 } 1849 1850 1851 unsigned 1852 NetCksum(uchar *ptr, int len) 1853 { 1854 ulong xsum; 1855 ushort *p = (ushort *)ptr; 1856 1857 xsum = 0; 1858 while (len-- > 0) 1859 xsum += *p++; 1860 xsum = (xsum & 0xffff) + (xsum >> 16); 1861 xsum = (xsum & 0xffff) + (xsum >> 16); 1862 return xsum & 0xffff; 1863 } 1864 1865 int 1866 NetEthHdrSize(void) 1867 { 1868 ushort myvlanid; 1869 1870 myvlanid = ntohs(NetOurVLAN); 1871 if (myvlanid == (ushort)-1) 1872 myvlanid = VLAN_NONE; 1873 1874 return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : 1875 VLAN_ETHER_HDR_SIZE; 1876 } 1877 1878 int 1879 NetSetEther(volatile uchar *xet, uchar * addr, uint prot) 1880 { 1881 Ethernet_t *et = (Ethernet_t *)xet; 1882 ushort myvlanid; 1883 1884 myvlanid = ntohs(NetOurVLAN); 1885 if (myvlanid == (ushort)-1) 1886 myvlanid = VLAN_NONE; 1887 1888 memcpy(et->et_dest, addr, 6); 1889 memcpy(et->et_src, NetOurEther, 6); 1890 if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) { 1891 et->et_protlen = htons(prot); 1892 return ETHER_HDR_SIZE; 1893 } else { 1894 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet; 1895 1896 vet->vet_vlan_type = htons(PROT_VLAN); 1897 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK)); 1898 vet->vet_type = htons(prot); 1899 return VLAN_ETHER_HDR_SIZE; 1900 } 1901 } 1902 1903 void 1904 NetSetIP(volatile uchar *xip, IPaddr_t dest, int dport, int sport, int len) 1905 { 1906 IP_t *ip = (IP_t *)xip; 1907 1908 /* 1909 * If the data is an odd number of bytes, zero the 1910 * byte after the last byte so that the checksum 1911 * will work. 1912 */ 1913 if (len & 1) 1914 xip[IP_HDR_SIZE + len] = 0; 1915 1916 /* 1917 * Construct an IP and UDP header. 1918 * (need to set no fragment bit - XXX) 1919 */ 1920 /* IP_HDR_SIZE / 4 (not including UDP) */ 1921 ip->ip_hl_v = 0x45; 1922 ip->ip_tos = 0; 1923 ip->ip_len = htons(IP_HDR_SIZE + len); 1924 ip->ip_id = htons(NetIPID++); 1925 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ 1926 ip->ip_ttl = 255; 1927 ip->ip_p = 17; /* UDP */ 1928 ip->ip_sum = 0; 1929 /* already in network byte order */ 1930 NetCopyIP((void *)&ip->ip_src, &NetOurIP); 1931 /* - "" - */ 1932 NetCopyIP((void *)&ip->ip_dst, &dest); 1933 ip->udp_src = htons(sport); 1934 ip->udp_dst = htons(dport); 1935 ip->udp_len = htons(8 + len); 1936 ip->udp_xsum = 0; 1937 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2); 1938 } 1939 1940 void copy_filename(char *dst, const char *src, int size) 1941 { 1942 if (*src && (*src == '"')) { 1943 ++src; 1944 --size; 1945 } 1946 1947 while ((--size > 0) && *src && (*src != '"')) 1948 *dst++ = *src++; 1949 *dst = '\0'; 1950 } 1951 1952 #if defined(CONFIG_CMD_NFS) || \ 1953 defined(CONFIG_CMD_SNTP) || \ 1954 defined(CONFIG_CMD_DNS) 1955 /* 1956 * make port a little random (1024-17407) 1957 * This keeps the math somewhat trivial to compute, and seems to work with 1958 * all supported protocols/clients/servers 1959 */ 1960 unsigned int random_port(void) 1961 { 1962 return 1024 + (get_timer(0) % 0x4000); 1963 } 1964 #endif 1965 1966 void ip_to_string(IPaddr_t x, char *s) 1967 { 1968 x = ntohl(x); 1969 sprintf(s, "%d.%d.%d.%d", 1970 (int) ((x >> 24) & 0xff), 1971 (int) ((x >> 16) & 0xff), 1972 (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff) 1973 ); 1974 } 1975 1976 void VLAN_to_string(ushort x, char *s) 1977 { 1978 x = ntohs(x); 1979 1980 if (x == (ushort)-1) 1981 x = VLAN_NONE; 1982 1983 if (x == VLAN_NONE) 1984 strcpy(s, "none"); 1985 else 1986 sprintf(s, "%d", x & VLAN_IDMASK); 1987 } 1988 1989 ushort string_to_VLAN(const char *s) 1990 { 1991 ushort id; 1992 1993 if (s == NULL) 1994 return htons(VLAN_NONE); 1995 1996 if (*s < '0' || *s > '9') 1997 id = VLAN_NONE; 1998 else 1999 id = (ushort)simple_strtoul(s, NULL, 10); 2000 2001 return htons(id); 2002 } 2003 2004 ushort getenv_VLAN(char *var) 2005 { 2006 return string_to_VLAN(getenv(var)); 2007 } 2008