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