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