1 /* 2 * Copied from Linux Monitor (LiMon) - Networking. 3 * 4 * Copyright 1994 - 2000 Neil Russell. 5 * (See License) 6 * Copyright 2000 Roland Borde 7 * Copyright 2000 Paolo Scaffardi 8 * Copyright 2000-2002 Wolfgang Denk, wd@denx.de 9 */ 10 11 /* 12 * General Desription: 13 * 14 * The user interface supports commands for BOOTP, RARP, and TFTP. 15 * Also, we support ARP internally. Depending on available data, 16 * these interact as follows: 17 * 18 * BOOTP: 19 * 20 * Prerequisites: - own ethernet address 21 * We want: - own IP address 22 * - TFTP server IP address 23 * - name of bootfile 24 * Next step: ARP 25 * 26 * RARP: 27 * 28 * Prerequisites: - own ethernet address 29 * We want: - own IP address 30 * - TFTP server IP address 31 * Next step: ARP 32 * 33 * ARP: 34 * 35 * Prerequisites: - own ethernet address 36 * - own IP address 37 * - TFTP server IP address 38 * We want: - TFTP server ethernet address 39 * Next step: TFTP 40 * 41 * DHCP: 42 * 43 * Prerequisites: - own ethernet address 44 * We want: - IP, Netmask, ServerIP, Gateway IP 45 * - bootfilename, lease time 46 * Next step: - TFTP 47 * 48 * TFTP: 49 * 50 * Prerequisites: - own ethernet address 51 * - own IP address 52 * - TFTP server IP address 53 * - TFTP server ethernet address 54 * - name of bootfile (if unknown, we use a default name 55 * derived from our own IP address) 56 * We want: - load the boot file 57 * Next step: none 58 * 59 * NFS: 60 * 61 * Prerequisites: - own ethernet address 62 * - own IP address 63 * - name of bootfile (if unknown, we use a default name 64 * derived from our own IP address) 65 * We want: - load the boot file 66 * Next step: none 67 * 68 * SNTP: 69 * 70 * Prerequisites: - own ethernet address 71 * - own IP address 72 * We want: - network time 73 * Next step: none 74 */ 75 76 77 #include <common.h> 78 #include <watchdog.h> 79 #include <command.h> 80 #include <linux/compiler.h> 81 #include <net.h> 82 #include "bootp.h" 83 #include "tftp.h" 84 #ifdef CONFIG_CMD_RARP 85 #include "rarp.h" 86 #endif 87 #include "nfs.h" 88 #ifdef CONFIG_STATUS_LED 89 #include <status_led.h> 90 #include <miiphy.h> 91 #endif 92 #if defined(CONFIG_CMD_SNTP) 93 #include "sntp.h" 94 #endif 95 #if defined(CONFIG_CDP_VERSION) 96 #include <timestamp.h> 97 #endif 98 #if defined(CONFIG_CMD_DNS) 99 #include "dns.h" 100 #endif 101 102 DECLARE_GLOBAL_DATA_PTR; 103 104 #ifndef CONFIG_ARP_TIMEOUT 105 /* Milliseconds before trying ARP again */ 106 # define ARP_TIMEOUT 5000UL 107 #else 108 # define ARP_TIMEOUT CONFIG_ARP_TIMEOUT 109 #endif 110 111 112 #ifndef CONFIG_NET_RETRY_COUNT 113 # define ARP_TIMEOUT_COUNT 5 /* # of timeouts before giving up */ 114 #else 115 # define ARP_TIMEOUT_COUNT CONFIG_NET_RETRY_COUNT 116 #endif 117 118 /** BOOTP EXTENTIONS **/ 119 120 /* Our subnet mask (0=unknown) */ 121 IPaddr_t NetOurSubnetMask; 122 /* Our gateways IP address */ 123 IPaddr_t NetOurGatewayIP; 124 /* Our DNS IP address */ 125 IPaddr_t NetOurDNSIP; 126 #if defined(CONFIG_BOOTP_DNS2) 127 /* Our 2nd DNS IP address */ 128 IPaddr_t NetOurDNS2IP; 129 #endif 130 /* Our NIS domain */ 131 char NetOurNISDomain[32] = {0,}; 132 /* Our hostname */ 133 char NetOurHostName[32] = {0,}; 134 /* Our bootpath */ 135 char NetOurRootPath[64] = {0,}; 136 /* Our bootfile size in blocks */ 137 ushort NetBootFileSize; 138 139 #ifdef CONFIG_MCAST_TFTP /* Multicast TFTP */ 140 IPaddr_t Mcast_addr; 141 #endif 142 143 /** END OF BOOTP EXTENTIONS **/ 144 145 /* The actual transferred size of the bootfile (in bytes) */ 146 ulong NetBootFileXferSize; 147 /* Our ethernet address */ 148 uchar NetOurEther[6]; 149 /* Boot server enet address */ 150 uchar NetServerEther[6]; 151 /* Our IP addr (0 = unknown) */ 152 IPaddr_t NetOurIP; 153 /* Server IP addr (0 = unknown) */ 154 IPaddr_t NetServerIP; 155 /* Current receive packet */ 156 uchar *NetRxPacket; 157 /* Current rx packet length */ 158 int NetRxPacketLen; 159 /* IP packet ID */ 160 unsigned NetIPID; 161 /* Ethernet bcast address */ 162 uchar NetBcastAddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 163 uchar NetEtherNullAddr[6]; 164 #ifdef CONFIG_API 165 void (*push_packet)(void *, int len) = 0; 166 #endif 167 #if defined(CONFIG_CMD_CDP) 168 /* Ethernet bcast address */ 169 uchar NetCDPAddr[6] = { 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc }; 170 #endif 171 /* Network loop state */ 172 int NetState; 173 /* Tried all network devices */ 174 int NetRestartWrap; 175 /* Network loop restarted */ 176 static int NetRestarted; 177 /* At least one device configured */ 178 static int NetDevExists; 179 180 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */ 181 /* default is without VLAN */ 182 ushort NetOurVLAN = 0xFFFF; 183 /* ditto */ 184 ushort NetOurNativeVLAN = 0xFFFF; 185 186 /* Boot File name */ 187 char BootFile[128]; 188 189 #if defined(CONFIG_CMD_PING) 190 /* the ip address to ping */ 191 IPaddr_t NetPingIP; 192 193 static void PingStart(void); 194 #endif 195 196 #if defined(CONFIG_CMD_CDP) 197 static void CDPStart(void); 198 #endif 199 200 #if defined(CONFIG_CMD_SNTP) 201 /* NTP server IP address */ 202 IPaddr_t NetNtpServerIP; 203 /* offset time from UTC */ 204 int NetTimeOffset; 205 #endif 206 207 uchar PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN]; 208 209 /* Receive packet */ 210 uchar *NetRxPackets[PKTBUFSRX]; 211 212 /* Current RX packet handler */ 213 static rxhand_f *packetHandler; 214 #ifdef CONFIG_CMD_TFTPPUT 215 static rxhand_icmp_f *packet_icmp_handler; /* Current ICMP rx handler */ 216 #endif 217 /* Current timeout handler */ 218 static thand_f *timeHandler; 219 /* Time base value */ 220 static ulong timeStart; 221 /* Current timeout value */ 222 static ulong timeDelta; 223 /* THE transmit packet */ 224 uchar *NetTxPacket; 225 226 static int net_check_prereq(enum proto_t protocol); 227 228 static int NetTryCount; 229 230 /**********************************************************************/ 231 232 IPaddr_t NetArpWaitPacketIP; 233 IPaddr_t NetArpWaitReplyIP; 234 /* MAC address of waiting packet's destination */ 235 uchar *NetArpWaitPacketMAC; 236 /* THE transmit packet */ 237 uchar *NetArpWaitTxPacket; 238 int NetArpWaitTxPacketSize; 239 uchar NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN]; 240 ulong NetArpWaitTimerStart; 241 int NetArpWaitTry; 242 243 void ArpRequest(void) 244 { 245 uchar *pkt; 246 ARP_t *arp; 247 248 debug("ARP broadcast %d\n", NetArpWaitTry); 249 250 pkt = NetTxPacket; 251 252 pkt += NetSetEther(pkt, NetBcastAddr, PROT_ARP); 253 254 arp = (ARP_t *) pkt; 255 256 arp->ar_hrd = htons(ARP_ETHER); 257 arp->ar_pro = htons(PROT_IP); 258 arp->ar_hln = 6; 259 arp->ar_pln = 4; 260 arp->ar_op = htons(ARPOP_REQUEST); 261 262 /* source ET addr */ 263 memcpy(&arp->ar_data[0], NetOurEther, 6); 264 /* source IP addr */ 265 NetWriteIP((uchar *) &arp->ar_data[6], NetOurIP); 266 /* dest ET addr = 0 */ 267 memset(&arp->ar_data[10], '\0', 6); 268 if ((NetArpWaitPacketIP & NetOurSubnetMask) != 269 (NetOurIP & NetOurSubnetMask)) { 270 if (NetOurGatewayIP == 0) { 271 puts("## Warning: gatewayip needed but not set\n"); 272 NetArpWaitReplyIP = NetArpWaitPacketIP; 273 } else { 274 NetArpWaitReplyIP = NetOurGatewayIP; 275 } 276 } else { 277 NetArpWaitReplyIP = NetArpWaitPacketIP; 278 } 279 280 NetWriteIP((uchar *) &arp->ar_data[16], NetArpWaitReplyIP); 281 (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE); 282 } 283 284 void ArpTimeoutCheck(void) 285 { 286 ulong t; 287 288 if (!NetArpWaitPacketIP) 289 return; 290 291 t = get_timer(0); 292 293 /* check for arp timeout */ 294 if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT) { 295 NetArpWaitTry++; 296 297 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) { 298 puts("\nARP Retry count exceeded; starting again\n"); 299 NetArpWaitTry = 0; 300 NetStartAgain(); 301 } else { 302 NetArpWaitTimerStart = t; 303 ArpRequest(); 304 } 305 } 306 } 307 308 /* 309 * Check if autoload is enabled. If so, use either NFS or TFTP to download 310 * the boot file. 311 */ 312 void net_auto_load(void) 313 { 314 const char *s = getenv("autoload"); 315 316 if (s != NULL) { 317 if (*s == 'n') { 318 /* 319 * Just use BOOTP/RARP to configure system; 320 * Do not use TFTP to load the bootfile. 321 */ 322 NetState = NETLOOP_SUCCESS; 323 return; 324 } 325 #if defined(CONFIG_CMD_NFS) 326 if (strcmp(s, "NFS") == 0) { 327 /* 328 * Use NFS to load the bootfile. 329 */ 330 NfsStart(); 331 return; 332 } 333 #endif 334 } 335 TftpStart(TFTPGET); 336 } 337 338 static void NetInitLoop(enum proto_t protocol) 339 { 340 static int env_changed_id; 341 bd_t *bd = gd->bd; 342 int env_id = get_env_id(); 343 344 /* update only when the environment has changed */ 345 if (env_changed_id != env_id) { 346 NetOurIP = getenv_IPaddr("ipaddr"); 347 NetCopyIP(&bd->bi_ip_addr, &NetOurIP); 348 NetOurGatewayIP = getenv_IPaddr("gatewayip"); 349 NetOurSubnetMask = getenv_IPaddr("netmask"); 350 NetServerIP = getenv_IPaddr("serverip"); 351 NetOurNativeVLAN = getenv_VLAN("nvlan"); 352 NetOurVLAN = getenv_VLAN("vlan"); 353 #if defined(CONFIG_CMD_DNS) 354 NetOurDNSIP = getenv_IPaddr("dnsip"); 355 #endif 356 env_changed_id = env_id; 357 } 358 359 return; 360 } 361 362 /**********************************************************************/ 363 /* 364 * Main network processing loop. 365 */ 366 367 int NetLoop(enum proto_t protocol) 368 { 369 bd_t *bd = gd->bd; 370 int ret = -1; 371 372 NetRestarted = 0; 373 NetDevExists = 0; 374 375 /* XXX problem with bss workaround */ 376 NetArpWaitPacketMAC = NULL; 377 NetArpWaitTxPacket = NULL; 378 NetArpWaitPacketIP = 0; 379 NetArpWaitReplyIP = 0; 380 NetArpWaitTxPacket = NULL; 381 NetTxPacket = NULL; 382 NetTryCount = 1; 383 384 if (!NetTxPacket) { 385 int i; 386 /* 387 * Setup packet buffers, aligned correctly. 388 */ 389 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1); 390 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN; 391 for (i = 0; i < PKTBUFSRX; i++) 392 NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN; 393 } 394 395 if (!NetArpWaitTxPacket) { 396 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1); 397 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN; 398 NetArpWaitTxPacketSize = 0; 399 } 400 401 bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start"); 402 eth_halt(); 403 eth_set_current(); 404 if (eth_init(bd) < 0) { 405 eth_halt(); 406 return -1; 407 } 408 409 restart: 410 memcpy(NetOurEther, eth_get_dev()->enetaddr, 6); 411 412 NetState = NETLOOP_CONTINUE; 413 414 /* 415 * Start the ball rolling with the given start function. From 416 * here on, this code is a state machine driven by received 417 * packets and timer events. 418 */ 419 NetInitLoop(protocol); 420 421 switch (net_check_prereq(protocol)) { 422 case 1: 423 /* network not configured */ 424 eth_halt(); 425 return -1; 426 427 case 2: 428 /* network device not configured */ 429 break; 430 431 case 0: 432 NetDevExists = 1; 433 NetBootFileXferSize = 0; 434 switch (protocol) { 435 case TFTPGET: 436 #ifdef CONFIG_CMD_TFTPPUT 437 case TFTPPUT: 438 #endif 439 /* always use ARP to get server ethernet address */ 440 TftpStart(protocol); 441 break; 442 #ifdef CONFIG_CMD_TFTPSRV 443 case TFTPSRV: 444 TftpStartServer(); 445 break; 446 #endif 447 #if defined(CONFIG_CMD_DHCP) 448 case DHCP: 449 BootpTry = 0; 450 NetOurIP = 0; 451 DhcpRequest(); /* Basically same as BOOTP */ 452 break; 453 #endif 454 455 case BOOTP: 456 BootpTry = 0; 457 NetOurIP = 0; 458 BootpRequest(); 459 break; 460 461 #if defined(CONFIG_CMD_RARP) 462 case RARP: 463 RarpTry = 0; 464 NetOurIP = 0; 465 RarpRequest(); 466 break; 467 #endif 468 #if defined(CONFIG_CMD_PING) 469 case PING: 470 PingStart(); 471 break; 472 #endif 473 #if defined(CONFIG_CMD_NFS) 474 case NFS: 475 NfsStart(); 476 break; 477 #endif 478 #if defined(CONFIG_CMD_CDP) 479 case CDP: 480 CDPStart(); 481 break; 482 #endif 483 #ifdef CONFIG_NETCONSOLE 484 case NETCONS: 485 NcStart(); 486 break; 487 #endif 488 #if defined(CONFIG_CMD_SNTP) 489 case SNTP: 490 SntpStart(); 491 break; 492 #endif 493 #if defined(CONFIG_CMD_DNS) 494 case DNS: 495 DnsStart(); 496 break; 497 #endif 498 default: 499 break; 500 } 501 502 break; 503 } 504 505 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 506 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ 507 defined(CONFIG_STATUS_LED) && \ 508 defined(STATUS_LED_RED) 509 /* 510 * Echo the inverted link state to the fault LED. 511 */ 512 if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) 513 status_led_set(STATUS_LED_RED, STATUS_LED_OFF); 514 else 515 status_led_set(STATUS_LED_RED, STATUS_LED_ON); 516 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 517 #endif /* CONFIG_MII, ... */ 518 519 /* 520 * Main packet reception loop. Loop receiving packets until 521 * someone sets `NetState' to a state that terminates. 522 */ 523 for (;;) { 524 WATCHDOG_RESET(); 525 #ifdef CONFIG_SHOW_ACTIVITY 526 show_activity(1); 527 #endif 528 /* 529 * Check the ethernet for a new packet. The ethernet 530 * receive routine will process it. 531 */ 532 eth_rx(); 533 534 /* 535 * Abort if ctrl-c was pressed. 536 */ 537 if (ctrlc()) { 538 eth_halt(); 539 puts("\nAbort\n"); 540 goto done; 541 } 542 543 ArpTimeoutCheck(); 544 545 /* 546 * Check for a timeout, and run the timeout handler 547 * if we have one. 548 */ 549 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) { 550 thand_f *x; 551 552 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 553 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ 554 defined(CONFIG_STATUS_LED) && \ 555 defined(STATUS_LED_RED) 556 /* 557 * Echo the inverted link state to the fault LED. 558 */ 559 if (miiphy_link(eth_get_dev()->name, 560 CONFIG_SYS_FAULT_MII_ADDR)) { 561 status_led_set(STATUS_LED_RED, STATUS_LED_OFF); 562 } else { 563 status_led_set(STATUS_LED_RED, STATUS_LED_ON); 564 } 565 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 566 #endif /* CONFIG_MII, ... */ 567 x = timeHandler; 568 timeHandler = (thand_f *)0; 569 (*x)(); 570 } 571 572 573 switch (NetState) { 574 575 case NETLOOP_RESTART: 576 NetRestarted = 1; 577 goto restart; 578 579 case NETLOOP_SUCCESS: 580 if (NetBootFileXferSize > 0) { 581 char buf[20]; 582 printf("Bytes transferred = %ld (%lx hex)\n", 583 NetBootFileXferSize, 584 NetBootFileXferSize); 585 sprintf(buf, "%lX", NetBootFileXferSize); 586 setenv("filesize", buf); 587 588 sprintf(buf, "%lX", (unsigned long)load_addr); 589 setenv("fileaddr", buf); 590 } 591 eth_halt(); 592 ret = NetBootFileXferSize; 593 goto done; 594 595 case NETLOOP_FAIL: 596 goto done; 597 } 598 } 599 600 done: 601 #ifdef CONFIG_CMD_TFTPPUT 602 /* Clear out the handlers */ 603 NetSetHandler(NULL); 604 net_set_icmp_handler(NULL); 605 #endif 606 return ret; 607 } 608 609 /**********************************************************************/ 610 611 static void 612 startAgainTimeout(void) 613 { 614 NetState = NETLOOP_RESTART; 615 } 616 617 static void 618 startAgainHandler(uchar *pkt, unsigned dest, IPaddr_t sip, 619 unsigned src, unsigned len) 620 { 621 /* Totally ignore the packet */ 622 } 623 624 void NetStartAgain(void) 625 { 626 char *nretry; 627 int retry_forever = 0; 628 unsigned long retrycnt = 0; 629 630 nretry = getenv("netretry"); 631 if (nretry) { 632 if (!strcmp(nretry, "yes")) 633 retry_forever = 1; 634 else if (!strcmp(nretry, "no")) 635 retrycnt = 0; 636 else if (!strcmp(nretry, "once")) 637 retrycnt = 1; 638 else 639 retrycnt = simple_strtoul(nretry, NULL, 0); 640 } else 641 retry_forever = 1; 642 643 if ((!retry_forever) && (NetTryCount >= retrycnt)) { 644 eth_halt(); 645 NetState = NETLOOP_FAIL; 646 return; 647 } 648 649 NetTryCount++; 650 651 eth_halt(); 652 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER) 653 eth_try_another(!NetRestarted); 654 #endif 655 eth_init(gd->bd); 656 if (NetRestartWrap) { 657 NetRestartWrap = 0; 658 if (NetDevExists) { 659 NetSetTimeout(10000UL, startAgainTimeout); 660 NetSetHandler(startAgainHandler); 661 } else { 662 NetState = NETLOOP_FAIL; 663 } 664 } else { 665 NetState = NETLOOP_RESTART; 666 } 667 } 668 669 /**********************************************************************/ 670 /* 671 * Miscelaneous bits. 672 */ 673 674 void 675 NetSetHandler(rxhand_f *f) 676 { 677 packetHandler = f; 678 } 679 680 #ifdef CONFIG_CMD_TFTPPUT 681 void net_set_icmp_handler(rxhand_icmp_f *f) 682 { 683 packet_icmp_handler = f; 684 } 685 #endif 686 687 void 688 NetSetTimeout(ulong iv, thand_f *f) 689 { 690 if (iv == 0) { 691 timeHandler = (thand_f *)0; 692 } else { 693 timeHandler = f; 694 timeStart = get_timer(0); 695 timeDelta = iv; 696 } 697 } 698 699 700 void 701 NetSendPacket(uchar *pkt, int len) 702 { 703 (void) eth_send(pkt, len); 704 } 705 706 int 707 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len) 708 { 709 uchar *pkt; 710 711 /* convert to new style broadcast */ 712 if (dest == 0) 713 dest = 0xFFFFFFFF; 714 715 /* if broadcast, make the ether address a broadcast and don't do ARP */ 716 if (dest == 0xFFFFFFFF) 717 ether = NetBcastAddr; 718 719 /* 720 * if MAC address was not discovered yet, save the packet and do 721 * an ARP request 722 */ 723 if (memcmp(ether, NetEtherNullAddr, 6) == 0) { 724 725 debug("sending ARP for %08x\n", dest); 726 727 NetArpWaitPacketIP = dest; 728 NetArpWaitPacketMAC = ether; 729 730 pkt = NetArpWaitTxPacket; 731 pkt += NetSetEther(pkt, NetArpWaitPacketMAC, PROT_IP); 732 733 NetSetIP(pkt, dest, dport, sport, len); 734 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + 735 (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len); 736 737 /* size of the waiting packet */ 738 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + 739 IP_HDR_SIZE + len; 740 741 /* and do the ARP request */ 742 NetArpWaitTry = 1; 743 NetArpWaitTimerStart = get_timer(0); 744 ArpRequest(); 745 return 1; /* waiting */ 746 } 747 748 debug("sending UDP to %08x/%pM\n", dest, ether); 749 750 pkt = (uchar *)NetTxPacket; 751 pkt += NetSetEther(pkt, ether, PROT_IP); 752 NetSetIP(pkt, dest, dport, sport, len); 753 (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len); 754 755 return 0; /* transmitted */ 756 } 757 758 #if defined(CONFIG_CMD_PING) 759 static ushort PingSeqNo; 760 761 int PingSend(void) 762 { 763 static uchar mac[6]; 764 IP_t *ip; 765 ushort *s; 766 uchar *pkt; 767 768 /* XXX always send arp request */ 769 770 memcpy(mac, NetEtherNullAddr, 6); 771 772 debug("sending ARP for %08x\n", NetPingIP); 773 774 NetArpWaitPacketIP = NetPingIP; 775 NetArpWaitPacketMAC = mac; 776 777 pkt = NetArpWaitTxPacket; 778 pkt += NetSetEther(pkt, mac, PROT_IP); 779 780 ip = (IP_t *)pkt; 781 782 /* 783 * Construct an IP and ICMP header. 784 * (need to set no fragment bit - XXX) 785 */ 786 /* IP_HDR_SIZE / 4 (not including UDP) */ 787 ip->ip_hl_v = 0x45; 788 ip->ip_tos = 0; 789 ip->ip_len = htons(IP_HDR_SIZE_NO_UDP + 8); 790 ip->ip_id = htons(NetIPID++); 791 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ 792 ip->ip_ttl = 255; 793 ip->ip_p = 0x01; /* ICMP */ 794 ip->ip_sum = 0; 795 /* already in network byte order */ 796 NetCopyIP((void *)&ip->ip_src, &NetOurIP); 797 /* - "" - */ 798 NetCopyIP((void *)&ip->ip_dst, &NetPingIP); 799 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2); 800 801 s = &ip->udp_src; /* XXX ICMP starts here */ 802 s[0] = htons(0x0800); /* echo-request, code */ 803 s[1] = 0; /* checksum */ 804 s[2] = 0; /* identifier */ 805 s[3] = htons(PingSeqNo++); /* sequence number */ 806 s[1] = ~NetCksum((uchar *)s, 8/2); 807 808 /* size of the waiting packet */ 809 NetArpWaitTxPacketSize = 810 (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8; 811 812 /* and do the ARP request */ 813 NetArpWaitTry = 1; 814 NetArpWaitTimerStart = get_timer(0); 815 ArpRequest(); 816 return 1; /* waiting */ 817 } 818 819 static void 820 PingTimeout(void) 821 { 822 eth_halt(); 823 NetState = NETLOOP_FAIL; /* we did not get the reply */ 824 } 825 826 static void 827 PingHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 828 unsigned len) 829 { 830 if (sip != NetPingIP) 831 return; 832 833 NetState = NETLOOP_SUCCESS; 834 } 835 836 static void PingStart(void) 837 { 838 printf("Using %s device\n", eth_get_name()); 839 NetSetTimeout(10000UL, PingTimeout); 840 NetSetHandler(PingHandler); 841 842 PingSend(); 843 } 844 #endif 845 846 #if defined(CONFIG_CMD_CDP) 847 848 #define CDP_DEVICE_ID_TLV 0x0001 849 #define CDP_ADDRESS_TLV 0x0002 850 #define CDP_PORT_ID_TLV 0x0003 851 #define CDP_CAPABILITIES_TLV 0x0004 852 #define CDP_VERSION_TLV 0x0005 853 #define CDP_PLATFORM_TLV 0x0006 854 #define CDP_NATIVE_VLAN_TLV 0x000a 855 #define CDP_APPLIANCE_VLAN_TLV 0x000e 856 #define CDP_TRIGGER_TLV 0x000f 857 #define CDP_POWER_CONSUMPTION_TLV 0x0010 858 #define CDP_SYSNAME_TLV 0x0014 859 #define CDP_SYSOBJECT_TLV 0x0015 860 #define CDP_MANAGEMENT_ADDRESS_TLV 0x0016 861 862 #define CDP_TIMEOUT 250UL /* one packet every 250ms */ 863 864 static int CDPSeq; 865 static int CDPOK; 866 867 ushort CDPNativeVLAN; 868 ushort CDPApplianceVLAN; 869 870 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 871 0x00 }; 872 873 static ushort CDP_compute_csum(const uchar *buff, ushort len) 874 { 875 ushort csum; 876 int odd; 877 ulong result = 0; 878 ushort leftover; 879 ushort *p; 880 881 if (len > 0) { 882 odd = 1 & (ulong)buff; 883 if (odd) { 884 result = *buff << 8; 885 len--; 886 buff++; 887 } 888 while (len > 1) { 889 p = (ushort *)buff; 890 result += *p++; 891 buff = (uchar *)p; 892 if (result & 0x80000000) 893 result = (result & 0xFFFF) + (result >> 16); 894 len -= 2; 895 } 896 if (len) { 897 leftover = (signed short)(*(const signed char *)buff); 898 /* CISCO SUCKS big time! (and blows too): 899 * CDP uses the IP checksum algorithm with a twist; 900 * for the last byte it *sign* extends and sums. 901 */ 902 result = (result & 0xffff0000) | 903 ((result + leftover) & 0x0000ffff); 904 } 905 while (result >> 16) 906 result = (result & 0xFFFF) + (result >> 16); 907 908 if (odd) 909 result = ((result >> 8) & 0xff) | 910 ((result & 0xff) << 8); 911 } 912 913 /* add up 16-bit and 17-bit words for 17+c bits */ 914 result = (result & 0xffff) + (result >> 16); 915 /* add up 16-bit and 2-bit for 16+c bit */ 916 result = (result & 0xffff) + (result >> 16); 917 /* add up carry.. */ 918 result = (result & 0xffff) + (result >> 16); 919 920 /* negate */ 921 csum = ~(ushort)result; 922 923 /* run time endian detection */ 924 if (csum != htons(csum)) /* little endian */ 925 csum = htons(csum); 926 927 return csum; 928 } 929 930 int CDPSendTrigger(void) 931 { 932 uchar *pkt; 933 ushort *s; 934 ushort *cp; 935 Ethernet_t *et; 936 int len; 937 ushort chksum; 938 #if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID) || \ 939 defined(CONFIG_CDP_VERSION) || defined(CONFIG_CDP_PLATFORM) 940 char buf[32]; 941 #endif 942 943 pkt = NetTxPacket; 944 et = (Ethernet_t *)pkt; 945 946 /* NOTE: trigger sent not on any VLAN */ 947 948 /* form ethernet header */ 949 memcpy(et->et_dest, NetCDPAddr, 6); 950 memcpy(et->et_src, NetOurEther, 6); 951 952 pkt += ETHER_HDR_SIZE; 953 954 /* SNAP header */ 955 memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)); 956 pkt += sizeof(CDP_SNAP_hdr); 957 958 /* CDP header */ 959 *pkt++ = 0x02; /* CDP version 2 */ 960 *pkt++ = 180; /* TTL */ 961 s = (ushort *)pkt; 962 cp = s; 963 /* checksum (0 for later calculation) */ 964 *s++ = htons(0); 965 966 /* CDP fields */ 967 #ifdef CONFIG_CDP_DEVICE_ID 968 *s++ = htons(CDP_DEVICE_ID_TLV); 969 *s++ = htons(CONFIG_CDP_DEVICE_ID); 970 sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%pm", NetOurEther); 971 memcpy((uchar *)s, buf, 16); 972 s += 16 / 2; 973 #endif 974 975 #ifdef CONFIG_CDP_PORT_ID 976 *s++ = htons(CDP_PORT_ID_TLV); 977 memset(buf, 0, sizeof(buf)); 978 sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index()); 979 len = strlen(buf); 980 if (len & 1) /* make it even */ 981 len++; 982 *s++ = htons(len + 4); 983 memcpy((uchar *)s, buf, len); 984 s += len / 2; 985 #endif 986 987 #ifdef CONFIG_CDP_CAPABILITIES 988 *s++ = htons(CDP_CAPABILITIES_TLV); 989 *s++ = htons(8); 990 *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES); 991 s += 2; 992 #endif 993 994 #ifdef CONFIG_CDP_VERSION 995 *s++ = htons(CDP_VERSION_TLV); 996 memset(buf, 0, sizeof(buf)); 997 strcpy(buf, CONFIG_CDP_VERSION); 998 len = strlen(buf); 999 if (len & 1) /* make it even */ 1000 len++; 1001 *s++ = htons(len + 4); 1002 memcpy((uchar *)s, buf, len); 1003 s += len / 2; 1004 #endif 1005 1006 #ifdef CONFIG_CDP_PLATFORM 1007 *s++ = htons(CDP_PLATFORM_TLV); 1008 memset(buf, 0, sizeof(buf)); 1009 strcpy(buf, CONFIG_CDP_PLATFORM); 1010 len = strlen(buf); 1011 if (len & 1) /* make it even */ 1012 len++; 1013 *s++ = htons(len + 4); 1014 memcpy((uchar *)s, buf, len); 1015 s += len / 2; 1016 #endif 1017 1018 #ifdef CONFIG_CDP_TRIGGER 1019 *s++ = htons(CDP_TRIGGER_TLV); 1020 *s++ = htons(8); 1021 *(ulong *)s = htonl(CONFIG_CDP_TRIGGER); 1022 s += 2; 1023 #endif 1024 1025 #ifdef CONFIG_CDP_POWER_CONSUMPTION 1026 *s++ = htons(CDP_POWER_CONSUMPTION_TLV); 1027 *s++ = htons(6); 1028 *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION); 1029 #endif 1030 1031 /* length of ethernet packet */ 1032 len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE); 1033 et->et_protlen = htons(len); 1034 1035 len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr); 1036 chksum = CDP_compute_csum((uchar *)NetTxPacket + len, 1037 (uchar *)s - (NetTxPacket + len)); 1038 if (chksum == 0) 1039 chksum = 0xFFFF; 1040 *cp = htons(chksum); 1041 1042 (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket); 1043 return 0; 1044 } 1045 1046 static void 1047 CDPTimeout(void) 1048 { 1049 CDPSeq++; 1050 1051 if (CDPSeq < 3) { 1052 NetSetTimeout(CDP_TIMEOUT, CDPTimeout); 1053 CDPSendTrigger(); 1054 return; 1055 } 1056 1057 /* if not OK try again */ 1058 if (!CDPOK) 1059 NetStartAgain(); 1060 else 1061 NetState = NETLOOP_SUCCESS; 1062 } 1063 1064 static void 1065 CDPDummyHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 1066 unsigned len) 1067 { 1068 /* nothing */ 1069 } 1070 1071 static void 1072 CDPHandler(const uchar *pkt, unsigned len) 1073 { 1074 const uchar *t; 1075 const ushort *ss; 1076 ushort type, tlen; 1077 ushort vlan, nvlan; 1078 1079 /* minimum size? */ 1080 if (len < sizeof(CDP_SNAP_hdr) + 4) 1081 goto pkt_short; 1082 1083 /* check for valid CDP SNAP header */ 1084 if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0) 1085 return; 1086 1087 pkt += sizeof(CDP_SNAP_hdr); 1088 len -= sizeof(CDP_SNAP_hdr); 1089 1090 /* Version of CDP protocol must be >= 2 and TTL != 0 */ 1091 if (pkt[0] < 0x02 || pkt[1] == 0) 1092 return; 1093 1094 /* 1095 * if version is greater than 0x02 maybe we'll have a problem; 1096 * output a warning 1097 */ 1098 if (pkt[0] != 0x02) 1099 printf("**WARNING: CDP packet received with a protocol version " 1100 "%d > 2\n", pkt[0] & 0xff); 1101 1102 if (CDP_compute_csum(pkt, len) != 0) 1103 return; 1104 1105 pkt += 4; 1106 len -= 4; 1107 1108 vlan = htons(-1); 1109 nvlan = htons(-1); 1110 while (len > 0) { 1111 if (len < 4) 1112 goto pkt_short; 1113 1114 ss = (const ushort *)pkt; 1115 type = ntohs(ss[0]); 1116 tlen = ntohs(ss[1]); 1117 if (tlen > len) 1118 goto pkt_short; 1119 1120 pkt += tlen; 1121 len -= tlen; 1122 1123 ss += 2; /* point ss to the data of the TLV */ 1124 tlen -= 4; 1125 1126 switch (type) { 1127 case CDP_DEVICE_ID_TLV: 1128 break; 1129 case CDP_ADDRESS_TLV: 1130 break; 1131 case CDP_PORT_ID_TLV: 1132 break; 1133 case CDP_CAPABILITIES_TLV: 1134 break; 1135 case CDP_VERSION_TLV: 1136 break; 1137 case CDP_PLATFORM_TLV: 1138 break; 1139 case CDP_NATIVE_VLAN_TLV: 1140 nvlan = *ss; 1141 break; 1142 case CDP_APPLIANCE_VLAN_TLV: 1143 t = (const uchar *)ss; 1144 while (tlen > 0) { 1145 if (tlen < 3) 1146 goto pkt_short; 1147 1148 ss = (const ushort *)(t + 1); 1149 1150 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE 1151 if (t[0] == CONFIG_CDP_APPLIANCE_VLAN_TYPE) 1152 vlan = *ss; 1153 #else 1154 /* XXX will this work; dunno */ 1155 vlan = ntohs(*ss); 1156 #endif 1157 t += 3; tlen -= 3; 1158 } 1159 break; 1160 case CDP_TRIGGER_TLV: 1161 break; 1162 case CDP_POWER_CONSUMPTION_TLV: 1163 break; 1164 case CDP_SYSNAME_TLV: 1165 break; 1166 case CDP_SYSOBJECT_TLV: 1167 break; 1168 case CDP_MANAGEMENT_ADDRESS_TLV: 1169 break; 1170 } 1171 } 1172 1173 CDPApplianceVLAN = vlan; 1174 CDPNativeVLAN = nvlan; 1175 1176 CDPOK = 1; 1177 return; 1178 1179 pkt_short: 1180 printf("** CDP packet is too short\n"); 1181 return; 1182 } 1183 1184 static void CDPStart(void) 1185 { 1186 printf("Using %s device\n", eth_get_name()); 1187 CDPSeq = 0; 1188 CDPOK = 0; 1189 1190 CDPNativeVLAN = htons(-1); 1191 CDPApplianceVLAN = htons(-1); 1192 1193 NetSetTimeout(CDP_TIMEOUT, CDPTimeout); 1194 NetSetHandler(CDPDummyHandler); 1195 1196 CDPSendTrigger(); 1197 } 1198 #endif 1199 1200 #ifdef CONFIG_IP_DEFRAG 1201 /* 1202 * This function collects fragments in a single packet, according 1203 * to the algorithm in RFC815. It returns NULL or the pointer to 1204 * a complete packet, in static storage 1205 */ 1206 #ifndef CONFIG_NET_MAXDEFRAG 1207 #define CONFIG_NET_MAXDEFRAG 16384 1208 #endif 1209 /* 1210 * MAXDEFRAG, above, is chosen in the config file and is real data 1211 * so we need to add the NFS overhead, which is more than TFTP. 1212 * To use sizeof in the internal unnamed structures, we need a real 1213 * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately). 1214 * The compiler doesn't complain nor allocates the actual structure 1215 */ 1216 static struct rpc_t rpc_specimen; 1217 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply)) 1218 1219 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE_NO_UDP) 1220 1221 /* 1222 * this is the packet being assembled, either data or frag control. 1223 * Fragments go by 8 bytes, so this union must be 8 bytes long 1224 */ 1225 struct hole { 1226 /* first_byte is address of this structure */ 1227 u16 last_byte; /* last byte in this hole + 1 (begin of next hole) */ 1228 u16 next_hole; /* index of next (in 8-b blocks), 0 == none */ 1229 u16 prev_hole; /* index of prev, 0 == none */ 1230 u16 unused; 1231 }; 1232 1233 static IP_t *__NetDefragment(IP_t *ip, int *lenp) 1234 { 1235 static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN); 1236 static u16 first_hole, total_len; 1237 struct hole *payload, *thisfrag, *h, *newh; 1238 IP_t *localip = (IP_t *)pkt_buff; 1239 uchar *indata = (uchar *)ip; 1240 int offset8, start, len, done = 0; 1241 u16 ip_off = ntohs(ip->ip_off); 1242 1243 /* payload starts after IP header, this fragment is in there */ 1244 payload = (struct hole *)(pkt_buff + IP_HDR_SIZE_NO_UDP); 1245 offset8 = (ip_off & IP_OFFS); 1246 thisfrag = payload + offset8; 1247 start = offset8 * 8; 1248 len = ntohs(ip->ip_len) - IP_HDR_SIZE_NO_UDP; 1249 1250 if (start + len > IP_MAXUDP) /* fragment extends too far */ 1251 return NULL; 1252 1253 if (!total_len || localip->ip_id != ip->ip_id) { 1254 /* new (or different) packet, reset structs */ 1255 total_len = 0xffff; 1256 payload[0].last_byte = ~0; 1257 payload[0].next_hole = 0; 1258 payload[0].prev_hole = 0; 1259 first_hole = 0; 1260 /* any IP header will work, copy the first we received */ 1261 memcpy(localip, ip, IP_HDR_SIZE_NO_UDP); 1262 } 1263 1264 /* 1265 * What follows is the reassembly algorithm. We use the payload 1266 * array as a linked list of hole descriptors, as each hole starts 1267 * at a multiple of 8 bytes. However, last byte can be whatever value, 1268 * so it is represented as byte count, not as 8-byte blocks. 1269 */ 1270 1271 h = payload + first_hole; 1272 while (h->last_byte < start) { 1273 if (!h->next_hole) { 1274 /* no hole that far away */ 1275 return NULL; 1276 } 1277 h = payload + h->next_hole; 1278 } 1279 1280 /* last fragment may be 1..7 bytes, the "+7" forces acceptance */ 1281 if (offset8 + ((len + 7) / 8) <= h - payload) { 1282 /* no overlap with holes (dup fragment?) */ 1283 return NULL; 1284 } 1285 1286 if (!(ip_off & IP_FLAGS_MFRAG)) { 1287 /* no more fragmentss: truncate this (last) hole */ 1288 total_len = start + len; 1289 h->last_byte = start + len; 1290 } 1291 1292 /* 1293 * There is some overlap: fix the hole list. This code doesn't 1294 * deal with a fragment that overlaps with two different holes 1295 * (thus being a superset of a previously-received fragment). 1296 */ 1297 1298 if ((h >= thisfrag) && (h->last_byte <= start + len)) { 1299 /* complete overlap with hole: remove hole */ 1300 if (!h->prev_hole && !h->next_hole) { 1301 /* last remaining hole */ 1302 done = 1; 1303 } else if (!h->prev_hole) { 1304 /* first hole */ 1305 first_hole = h->next_hole; 1306 payload[h->next_hole].prev_hole = 0; 1307 } else if (!h->next_hole) { 1308 /* last hole */ 1309 payload[h->prev_hole].next_hole = 0; 1310 } else { 1311 /* in the middle of the list */ 1312 payload[h->next_hole].prev_hole = h->prev_hole; 1313 payload[h->prev_hole].next_hole = h->next_hole; 1314 } 1315 1316 } else if (h->last_byte <= start + len) { 1317 /* overlaps with final part of the hole: shorten this hole */ 1318 h->last_byte = start; 1319 1320 } else if (h >= thisfrag) { 1321 /* overlaps with initial part of the hole: move this hole */ 1322 newh = thisfrag + (len / 8); 1323 *newh = *h; 1324 h = newh; 1325 if (h->next_hole) 1326 payload[h->next_hole].prev_hole = (h - payload); 1327 if (h->prev_hole) 1328 payload[h->prev_hole].next_hole = (h - payload); 1329 else 1330 first_hole = (h - payload); 1331 1332 } else { 1333 /* fragment sits in the middle: split the hole */ 1334 newh = thisfrag + (len / 8); 1335 *newh = *h; 1336 h->last_byte = start; 1337 h->next_hole = (newh - payload); 1338 newh->prev_hole = (h - payload); 1339 if (newh->next_hole) 1340 payload[newh->next_hole].prev_hole = (newh - payload); 1341 } 1342 1343 /* finally copy this fragment and possibly return whole packet */ 1344 memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE_NO_UDP, len); 1345 if (!done) 1346 return NULL; 1347 1348 localip->ip_len = htons(total_len); 1349 *lenp = total_len + IP_HDR_SIZE_NO_UDP; 1350 return localip; 1351 } 1352 1353 static inline IP_t *NetDefragment(IP_t *ip, int *lenp) 1354 { 1355 u16 ip_off = ntohs(ip->ip_off); 1356 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) 1357 return ip; /* not a fragment */ 1358 return __NetDefragment(ip, lenp); 1359 } 1360 1361 #else /* !CONFIG_IP_DEFRAG */ 1362 1363 static inline IP_t *NetDefragment(IP_t *ip, int *lenp) 1364 { 1365 u16 ip_off = ntohs(ip->ip_off); 1366 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) 1367 return ip; /* not a fragment */ 1368 return NULL; 1369 } 1370 #endif 1371 1372 /** 1373 * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently 1374 * drop others. 1375 * 1376 * @parma ip IP packet containing the ICMP 1377 */ 1378 static void receive_icmp(IP_t *ip, int len, IPaddr_t src_ip, Ethernet_t *et) 1379 { 1380 ICMP_t *icmph = (ICMP_t *)&ip->udp_src; 1381 1382 switch (icmph->type) { 1383 case ICMP_REDIRECT: 1384 if (icmph->code != ICMP_REDIR_HOST) 1385 return; 1386 printf(" ICMP Host Redirect to %pI4 ", 1387 &icmph->un.gateway); 1388 break; 1389 #if defined(CONFIG_CMD_PING) 1390 case ICMP_ECHO_REPLY: 1391 /* 1392 * IP header OK. Pass the packet to the 1393 * current handler. 1394 */ 1395 /* 1396 * XXX point to ip packet - should this use 1397 * packet_icmp_handler? 1398 */ 1399 (*packetHandler)((uchar *)ip, 0, src_ip, 0, 0); 1400 break; 1401 case ICMP_ECHO_REQUEST: 1402 debug("Got ICMP ECHO REQUEST, return %d bytes\n", 1403 ETHER_HDR_SIZE + len); 1404 1405 memcpy(&et->et_dest[0], &et->et_src[0], 6); 1406 memcpy(&et->et_src[0], NetOurEther, 6); 1407 1408 ip->ip_sum = 0; 1409 ip->ip_off = 0; 1410 NetCopyIP((void *)&ip->ip_dst, &ip->ip_src); 1411 NetCopyIP((void *)&ip->ip_src, &NetOurIP); 1412 ip->ip_sum = ~NetCksum((uchar *)ip, 1413 IP_HDR_SIZE_NO_UDP >> 1); 1414 1415 icmph->type = ICMP_ECHO_REPLY; 1416 icmph->checksum = 0; 1417 icmph->checksum = ~NetCksum((uchar *)icmph, 1418 (len - IP_HDR_SIZE_NO_UDP) >> 1); 1419 (void) eth_send((uchar *)et, 1420 ETHER_HDR_SIZE + len); 1421 break; 1422 #endif 1423 default: 1424 #ifdef CONFIG_CMD_TFTPPUT 1425 if (packet_icmp_handler) 1426 packet_icmp_handler(icmph->type, icmph->code, 1427 ntohs(ip->udp_dst), src_ip, ntohs(ip->udp_src), 1428 icmph->un.data, ntohs(ip->udp_len)); 1429 #endif 1430 break; 1431 } 1432 } 1433 1434 void 1435 NetReceive(uchar *inpkt, int len) 1436 { 1437 Ethernet_t *et; 1438 IP_t *ip; 1439 ARP_t *arp; 1440 IPaddr_t tmp; 1441 IPaddr_t src_ip; 1442 int x; 1443 uchar *pkt; 1444 #if defined(CONFIG_CMD_CDP) 1445 int iscdp; 1446 #endif 1447 ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid; 1448 1449 debug("packet received\n"); 1450 1451 NetRxPacket = inpkt; 1452 NetRxPacketLen = len; 1453 et = (Ethernet_t *)inpkt; 1454 1455 /* too small packet? */ 1456 if (len < ETHER_HDR_SIZE) 1457 return; 1458 1459 #ifdef CONFIG_API 1460 if (push_packet) { 1461 (*push_packet)(inpkt, len); 1462 return; 1463 } 1464 #endif 1465 1466 #if defined(CONFIG_CMD_CDP) 1467 /* keep track if packet is CDP */ 1468 iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0; 1469 #endif 1470 1471 myvlanid = ntohs(NetOurVLAN); 1472 if (myvlanid == (ushort)-1) 1473 myvlanid = VLAN_NONE; 1474 mynvlanid = ntohs(NetOurNativeVLAN); 1475 if (mynvlanid == (ushort)-1) 1476 mynvlanid = VLAN_NONE; 1477 1478 x = ntohs(et->et_protlen); 1479 1480 debug("packet received\n"); 1481 1482 if (x < 1514) { 1483 /* 1484 * Got a 802 packet. Check the other protocol field. 1485 */ 1486 x = ntohs(et->et_prot); 1487 1488 ip = (IP_t *)(inpkt + E802_HDR_SIZE); 1489 len -= E802_HDR_SIZE; 1490 1491 } else if (x != PROT_VLAN) { /* normal packet */ 1492 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE); 1493 len -= ETHER_HDR_SIZE; 1494 1495 } else { /* VLAN packet */ 1496 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et; 1497 1498 debug("VLAN packet received\n"); 1499 1500 /* too small packet? */ 1501 if (len < VLAN_ETHER_HDR_SIZE) 1502 return; 1503 1504 /* if no VLAN active */ 1505 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE 1506 #if defined(CONFIG_CMD_CDP) 1507 && iscdp == 0 1508 #endif 1509 ) 1510 return; 1511 1512 cti = ntohs(vet->vet_tag); 1513 vlanid = cti & VLAN_IDMASK; 1514 x = ntohs(vet->vet_type); 1515 1516 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE); 1517 len -= VLAN_ETHER_HDR_SIZE; 1518 } 1519 1520 debug("Receive from protocol 0x%x\n", x); 1521 1522 #if defined(CONFIG_CMD_CDP) 1523 if (iscdp) { 1524 CDPHandler((uchar *)ip, len); 1525 return; 1526 } 1527 #endif 1528 1529 if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) { 1530 if (vlanid == VLAN_NONE) 1531 vlanid = (mynvlanid & VLAN_IDMASK); 1532 /* not matched? */ 1533 if (vlanid != (myvlanid & VLAN_IDMASK)) 1534 return; 1535 } 1536 1537 switch (x) { 1538 1539 case PROT_ARP: 1540 /* 1541 * We have to deal with two types of ARP packets: 1542 * - REQUEST packets will be answered by sending our 1543 * IP address - if we know it. 1544 * - REPLY packates are expected only after we asked 1545 * for the TFTP server's or the gateway's ethernet 1546 * address; so if we receive such a packet, we set 1547 * the server ethernet address 1548 */ 1549 debug("Got ARP\n"); 1550 1551 arp = (ARP_t *)ip; 1552 if (len < ARP_HDR_SIZE) { 1553 printf("bad length %d < %d\n", len, ARP_HDR_SIZE); 1554 return; 1555 } 1556 if (ntohs(arp->ar_hrd) != ARP_ETHER) 1557 return; 1558 if (ntohs(arp->ar_pro) != PROT_IP) 1559 return; 1560 if (arp->ar_hln != 6) 1561 return; 1562 if (arp->ar_pln != 4) 1563 return; 1564 1565 if (NetOurIP == 0) 1566 return; 1567 1568 if (NetReadIP(&arp->ar_data[16]) != NetOurIP) 1569 return; 1570 1571 switch (ntohs(arp->ar_op)) { 1572 case ARPOP_REQUEST: 1573 /* reply with our IP address */ 1574 debug("Got ARP REQUEST, return our IP\n"); 1575 pkt = (uchar *)et; 1576 pkt += NetSetEther(pkt, et->et_src, PROT_ARP); 1577 arp->ar_op = htons(ARPOP_REPLY); 1578 memcpy(&arp->ar_data[10], &arp->ar_data[0], 6); 1579 NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]); 1580 memcpy(&arp->ar_data[0], NetOurEther, 6); 1581 NetCopyIP(&arp->ar_data[6], &NetOurIP); 1582 (void) eth_send((uchar *)et, 1583 (pkt - (uchar *)et) + ARP_HDR_SIZE); 1584 return; 1585 1586 case ARPOP_REPLY: /* arp reply */ 1587 /* are we waiting for a reply */ 1588 if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC) 1589 break; 1590 1591 #ifdef CONFIG_KEEP_SERVERADDR 1592 if (NetServerIP == NetArpWaitPacketIP) { 1593 char buf[20]; 1594 sprintf(buf, "%pM", arp->ar_data); 1595 setenv("serveraddr", buf); 1596 } 1597 #endif 1598 1599 debug("Got ARP REPLY, set server/gtwy eth addr (%pM)\n", 1600 arp->ar_data); 1601 1602 tmp = NetReadIP(&arp->ar_data[6]); 1603 1604 /* matched waiting packet's address */ 1605 if (tmp == NetArpWaitReplyIP) { 1606 debug("Got it\n"); 1607 1608 /* save address for later use */ 1609 memcpy(NetArpWaitPacketMAC, 1610 &arp->ar_data[0], 6); 1611 1612 #ifdef CONFIG_NETCONSOLE 1613 (*packetHandler)(0, 0, 0, 0, 0); 1614 #endif 1615 /* modify header, and transmit it */ 1616 memcpy(((Ethernet_t *)NetArpWaitTxPacket)-> 1617 et_dest, NetArpWaitPacketMAC, 6); 1618 (void) eth_send(NetArpWaitTxPacket, 1619 NetArpWaitTxPacketSize); 1620 1621 /* no arp request pending now */ 1622 NetArpWaitPacketIP = 0; 1623 NetArpWaitTxPacketSize = 0; 1624 NetArpWaitPacketMAC = NULL; 1625 1626 } 1627 return; 1628 default: 1629 debug("Unexpected ARP opcode 0x%x\n", 1630 ntohs(arp->ar_op)); 1631 return; 1632 } 1633 break; 1634 1635 #ifdef CONFIG_CMD_RARP 1636 case PROT_RARP: 1637 debug("Got RARP\n"); 1638 arp = (ARP_t *)ip; 1639 if (len < ARP_HDR_SIZE) { 1640 printf("bad length %d < %d\n", len, ARP_HDR_SIZE); 1641 return; 1642 } 1643 1644 if ((ntohs(arp->ar_op) != RARPOP_REPLY) || 1645 (ntohs(arp->ar_hrd) != ARP_ETHER) || 1646 (ntohs(arp->ar_pro) != PROT_IP) || 1647 (arp->ar_hln != 6) || (arp->ar_pln != 4)) { 1648 1649 puts("invalid RARP header\n"); 1650 } else { 1651 NetCopyIP(&NetOurIP, &arp->ar_data[16]); 1652 if (NetServerIP == 0) 1653 NetCopyIP(&NetServerIP, &arp->ar_data[6]); 1654 memcpy(NetServerEther, &arp->ar_data[0], 6); 1655 1656 (*packetHandler)(0, 0, 0, 0, 0); 1657 } 1658 break; 1659 #endif 1660 case PROT_IP: 1661 debug("Got IP\n"); 1662 /* Before we start poking the header, make sure it is there */ 1663 if (len < IP_HDR_SIZE) { 1664 debug("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE); 1665 return; 1666 } 1667 /* Check the packet length */ 1668 if (len < ntohs(ip->ip_len)) { 1669 printf("len bad %d < %d\n", len, ntohs(ip->ip_len)); 1670 return; 1671 } 1672 len = ntohs(ip->ip_len); 1673 debug("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff); 1674 1675 /* Can't deal with anything except IPv4 */ 1676 if ((ip->ip_hl_v & 0xf0) != 0x40) 1677 return; 1678 /* Can't deal with IP options (headers != 20 bytes) */ 1679 if ((ip->ip_hl_v & 0x0f) > 0x05) 1680 return; 1681 /* Check the Checksum of the header */ 1682 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) { 1683 puts("checksum bad\n"); 1684 return; 1685 } 1686 /* If it is not for us, ignore it */ 1687 tmp = NetReadIP(&ip->ip_dst); 1688 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) { 1689 #ifdef CONFIG_MCAST_TFTP 1690 if (Mcast_addr != tmp) 1691 #endif 1692 return; 1693 } 1694 /* Read source IP address for later use */ 1695 src_ip = NetReadIP(&ip->ip_src); 1696 /* 1697 * The function returns the unchanged packet if it's not 1698 * a fragment, and either the complete packet or NULL if 1699 * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL) 1700 */ 1701 ip = NetDefragment(ip, &len); 1702 if (!ip) 1703 return; 1704 /* 1705 * watch for ICMP host redirects 1706 * 1707 * There is no real handler code (yet). We just watch 1708 * for ICMP host redirect messages. In case anybody 1709 * sees these messages: please contact me 1710 * (wd@denx.de), or - even better - send me the 1711 * necessary fixes :-) 1712 * 1713 * Note: in all cases where I have seen this so far 1714 * it was a problem with the router configuration, 1715 * for instance when a router was configured in the 1716 * BOOTP reply, but the TFTP server was on the same 1717 * subnet. So this is probably a warning that your 1718 * configuration might be wrong. But I'm not really 1719 * sure if there aren't any other situations. 1720 * 1721 * Simon Glass <sjg@chromium.org>: We get an ICMP when 1722 * we send a tftp packet to a dead connection, or when 1723 * there is no server at the other end. 1724 */ 1725 if (ip->ip_p == IPPROTO_ICMP) { 1726 receive_icmp(ip, len, src_ip, et); 1727 return; 1728 } else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */ 1729 return; 1730 } 1731 1732 #ifdef CONFIG_UDP_CHECKSUM 1733 if (ip->udp_xsum != 0) { 1734 ulong xsum; 1735 ushort *sumptr; 1736 ushort sumlen; 1737 1738 xsum = ip->ip_p; 1739 xsum += (ntohs(ip->udp_len)); 1740 xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff; 1741 xsum += (ntohl(ip->ip_src) >> 0) & 0x0000ffff; 1742 xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff; 1743 xsum += (ntohl(ip->ip_dst) >> 0) & 0x0000ffff; 1744 1745 sumlen = ntohs(ip->udp_len); 1746 sumptr = (ushort *) &(ip->udp_src); 1747 1748 while (sumlen > 1) { 1749 ushort sumdata; 1750 1751 sumdata = *sumptr++; 1752 xsum += ntohs(sumdata); 1753 sumlen -= 2; 1754 } 1755 if (sumlen > 0) { 1756 ushort sumdata; 1757 1758 sumdata = *(unsigned char *) sumptr; 1759 sumdata = (sumdata << 8) & 0xff00; 1760 xsum += sumdata; 1761 } 1762 while ((xsum >> 16) != 0) { 1763 xsum = (xsum & 0x0000ffff) + 1764 ((xsum >> 16) & 0x0000ffff); 1765 } 1766 if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) { 1767 printf(" UDP wrong checksum %08lx %08x\n", 1768 xsum, ntohs(ip->udp_xsum)); 1769 return; 1770 } 1771 } 1772 #endif 1773 1774 1775 #ifdef CONFIG_NETCONSOLE 1776 nc_input_packet((uchar *)ip + IP_HDR_SIZE, 1777 ntohs(ip->udp_dst), 1778 ntohs(ip->udp_src), 1779 ntohs(ip->udp_len) - 8); 1780 #endif 1781 /* 1782 * IP header OK. Pass the packet to the current handler. 1783 */ 1784 (*packetHandler)((uchar *)ip + IP_HDR_SIZE, 1785 ntohs(ip->udp_dst), 1786 src_ip, 1787 ntohs(ip->udp_src), 1788 ntohs(ip->udp_len) - 8); 1789 break; 1790 } 1791 } 1792 1793 1794 /**********************************************************************/ 1795 1796 static int net_check_prereq(enum proto_t protocol) 1797 { 1798 switch (protocol) { 1799 /* Fall through */ 1800 #if defined(CONFIG_CMD_PING) 1801 case PING: 1802 if (NetPingIP == 0) { 1803 puts("*** ERROR: ping address not given\n"); 1804 return 1; 1805 } 1806 goto common; 1807 #endif 1808 #if defined(CONFIG_CMD_SNTP) 1809 case SNTP: 1810 if (NetNtpServerIP == 0) { 1811 puts("*** ERROR: NTP server address not given\n"); 1812 return 1; 1813 } 1814 goto common; 1815 #endif 1816 #if defined(CONFIG_CMD_DNS) 1817 case DNS: 1818 if (NetOurDNSIP == 0) { 1819 puts("*** ERROR: DNS server address not given\n"); 1820 return 1; 1821 } 1822 goto common; 1823 #endif 1824 #if defined(CONFIG_CMD_NFS) 1825 case NFS: 1826 #endif 1827 case TFTPGET: 1828 case TFTPPUT: 1829 if (NetServerIP == 0) { 1830 puts("*** ERROR: `serverip' not set\n"); 1831 return 1; 1832 } 1833 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \ 1834 defined(CONFIG_CMD_DNS) 1835 common: 1836 #endif 1837 /* Fall through */ 1838 1839 case NETCONS: 1840 case TFTPSRV: 1841 if (NetOurIP == 0) { 1842 puts("*** ERROR: `ipaddr' not set\n"); 1843 return 1; 1844 } 1845 /* Fall through */ 1846 1847 #ifdef CONFIG_CMD_RARP 1848 case RARP: 1849 #endif 1850 case BOOTP: 1851 case CDP: 1852 case DHCP: 1853 if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) { 1854 int num = eth_get_dev_index(); 1855 1856 switch (num) { 1857 case -1: 1858 puts("*** ERROR: No ethernet found.\n"); 1859 return 1; 1860 case 0: 1861 puts("*** ERROR: `ethaddr' not set\n"); 1862 break; 1863 default: 1864 printf("*** ERROR: `eth%daddr' not set\n", 1865 num); 1866 break; 1867 } 1868 1869 NetStartAgain(); 1870 return 2; 1871 } 1872 /* Fall through */ 1873 default: 1874 return 0; 1875 } 1876 return 0; /* OK */ 1877 } 1878 /**********************************************************************/ 1879 1880 int 1881 NetCksumOk(uchar *ptr, int len) 1882 { 1883 return !((NetCksum(ptr, len) + 1) & 0xfffe); 1884 } 1885 1886 1887 unsigned 1888 NetCksum(uchar *ptr, int len) 1889 { 1890 ulong xsum; 1891 ushort *p = (ushort *)ptr; 1892 1893 xsum = 0; 1894 while (len-- > 0) 1895 xsum += *p++; 1896 xsum = (xsum & 0xffff) + (xsum >> 16); 1897 xsum = (xsum & 0xffff) + (xsum >> 16); 1898 return xsum & 0xffff; 1899 } 1900 1901 int 1902 NetEthHdrSize(void) 1903 { 1904 ushort myvlanid; 1905 1906 myvlanid = ntohs(NetOurVLAN); 1907 if (myvlanid == (ushort)-1) 1908 myvlanid = VLAN_NONE; 1909 1910 return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : 1911 VLAN_ETHER_HDR_SIZE; 1912 } 1913 1914 int 1915 NetSetEther(uchar *xet, uchar * addr, uint prot) 1916 { 1917 Ethernet_t *et = (Ethernet_t *)xet; 1918 ushort myvlanid; 1919 1920 myvlanid = ntohs(NetOurVLAN); 1921 if (myvlanid == (ushort)-1) 1922 myvlanid = VLAN_NONE; 1923 1924 memcpy(et->et_dest, addr, 6); 1925 memcpy(et->et_src, NetOurEther, 6); 1926 if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) { 1927 et->et_protlen = htons(prot); 1928 return ETHER_HDR_SIZE; 1929 } else { 1930 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet; 1931 1932 vet->vet_vlan_type = htons(PROT_VLAN); 1933 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK)); 1934 vet->vet_type = htons(prot); 1935 return VLAN_ETHER_HDR_SIZE; 1936 } 1937 } 1938 1939 void 1940 NetSetIP(uchar *xip, IPaddr_t dest, int dport, int sport, int len) 1941 { 1942 IP_t *ip = (IP_t *)xip; 1943 1944 /* 1945 * If the data is an odd number of bytes, zero the 1946 * byte after the last byte so that the checksum 1947 * will work. 1948 */ 1949 if (len & 1) 1950 xip[IP_HDR_SIZE + len] = 0; 1951 1952 /* 1953 * Construct an IP and UDP header. 1954 * (need to set no fragment bit - XXX) 1955 */ 1956 /* IP_HDR_SIZE / 4 (not including UDP) */ 1957 ip->ip_hl_v = 0x45; 1958 ip->ip_tos = 0; 1959 ip->ip_len = htons(IP_HDR_SIZE + len); 1960 ip->ip_id = htons(NetIPID++); 1961 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ 1962 ip->ip_ttl = 255; 1963 ip->ip_p = 17; /* UDP */ 1964 ip->ip_sum = 0; 1965 /* already in network byte order */ 1966 NetCopyIP((void *)&ip->ip_src, &NetOurIP); 1967 /* - "" - */ 1968 NetCopyIP((void *)&ip->ip_dst, &dest); 1969 ip->udp_src = htons(sport); 1970 ip->udp_dst = htons(dport); 1971 ip->udp_len = htons(8 + len); 1972 ip->udp_xsum = 0; 1973 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2); 1974 } 1975 1976 void copy_filename(char *dst, const char *src, int size) 1977 { 1978 if (*src && (*src == '"')) { 1979 ++src; 1980 --size; 1981 } 1982 1983 while ((--size > 0) && *src && (*src != '"')) 1984 *dst++ = *src++; 1985 *dst = '\0'; 1986 } 1987 1988 #if defined(CONFIG_CMD_NFS) || \ 1989 defined(CONFIG_CMD_SNTP) || \ 1990 defined(CONFIG_CMD_DNS) 1991 /* 1992 * make port a little random (1024-17407) 1993 * This keeps the math somewhat trivial to compute, and seems to work with 1994 * all supported protocols/clients/servers 1995 */ 1996 unsigned int random_port(void) 1997 { 1998 return 1024 + (get_timer(0) % 0x4000); 1999 } 2000 #endif 2001 2002 void ip_to_string(IPaddr_t x, char *s) 2003 { 2004 x = ntohl(x); 2005 sprintf(s, "%d.%d.%d.%d", 2006 (int) ((x >> 24) & 0xff), 2007 (int) ((x >> 16) & 0xff), 2008 (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff) 2009 ); 2010 } 2011 2012 void VLAN_to_string(ushort x, char *s) 2013 { 2014 x = ntohs(x); 2015 2016 if (x == (ushort)-1) 2017 x = VLAN_NONE; 2018 2019 if (x == VLAN_NONE) 2020 strcpy(s, "none"); 2021 else 2022 sprintf(s, "%d", x & VLAN_IDMASK); 2023 } 2024 2025 ushort string_to_VLAN(const char *s) 2026 { 2027 ushort id; 2028 2029 if (s == NULL) 2030 return htons(VLAN_NONE); 2031 2032 if (*s < '0' || *s > '9') 2033 id = VLAN_NONE; 2034 else 2035 id = (ushort)simple_strtoul(s, NULL, 10); 2036 2037 return htons(id); 2038 } 2039 2040 ushort getenv_VLAN(char *var) 2041 { 2042 return string_to_VLAN(getenv(var)); 2043 } 2044