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