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 #include "rarp.h" 84 #include "nfs.h" 85 #ifdef CONFIG_STATUS_LED 86 #include <status_led.h> 87 #include <miiphy.h> 88 #endif 89 #if defined(CONFIG_CMD_SNTP) 90 #include "sntp.h" 91 #endif 92 #if defined(CONFIG_CDP_VERSION) 93 #include <timestamp.h> 94 #endif 95 #if defined(CONFIG_CMD_DNS) 96 #include "dns.h" 97 #endif 98 99 #if defined(CONFIG_CMD_NET) 100 101 DECLARE_GLOBAL_DATA_PTR; 102 103 #ifndef CONFIG_ARP_TIMEOUT 104 # define ARP_TIMEOUT 5000UL /* Milliseconds before trying ARP again */ 105 #else 106 # define ARP_TIMEOUT CONFIG_ARP_TIMEOUT 107 #endif 108 109 110 #ifndef CONFIG_NET_RETRY_COUNT 111 # define ARP_TIMEOUT_COUNT 5 /* # of timeouts before giving up */ 112 #else 113 # define ARP_TIMEOUT_COUNT CONFIG_NET_RETRY_COUNT 114 #endif 115 116 /** BOOTP EXTENTIONS **/ 117 118 IPaddr_t NetOurSubnetMask=0; /* Our subnet mask (0=unknown) */ 119 IPaddr_t NetOurGatewayIP=0; /* Our gateways IP address */ 120 IPaddr_t NetOurDNSIP=0; /* Our DNS IP address */ 121 #if defined(CONFIG_BOOTP_DNS2) 122 IPaddr_t NetOurDNS2IP=0; /* Our 2nd DNS IP address */ 123 #endif 124 char NetOurNISDomain[32]={0,}; /* Our NIS domain */ 125 char NetOurHostName[32]={0,}; /* Our hostname */ 126 char NetOurRootPath[64]={0,}; /* Our bootpath */ 127 ushort NetBootFileSize=0; /* Our bootfile size in blocks */ 128 129 #ifdef CONFIG_MCAST_TFTP /* Multicast TFTP */ 130 IPaddr_t Mcast_addr; 131 #endif 132 133 /** END OF BOOTP EXTENTIONS **/ 134 135 ulong NetBootFileXferSize; /* The actual transferred size of the bootfile (in bytes) */ 136 uchar NetOurEther[6]; /* Our ethernet address */ 137 uchar NetServerEther[6] = /* Boot server enet address */ 138 { 0, 0, 0, 0, 0, 0 }; 139 IPaddr_t NetOurIP; /* Our IP addr (0 = unknown) */ 140 IPaddr_t NetServerIP; /* Server IP addr (0 = unknown) */ 141 volatile uchar *NetRxPacket; /* Current receive packet */ 142 int NetRxPacketLen; /* Current rx packet length */ 143 unsigned NetIPID; /* IP packet ID */ 144 uchar NetBcastAddr[6] = /* Ethernet bcast address */ 145 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 146 uchar NetEtherNullAddr[6] = 147 { 0, 0, 0, 0, 0, 0 }; 148 #ifdef CONFIG_API 149 void (*push_packet)(volatile void *, int len) = 0; 150 #endif 151 #if defined(CONFIG_CMD_CDP) 152 uchar NetCDPAddr[6] = /* Ethernet bcast address */ 153 { 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc }; 154 #endif 155 int NetState; /* Network loop state */ 156 #ifdef CONFIG_NET_MULTI 157 int NetRestartWrap = 0; /* Tried all network devices */ 158 static int NetRestarted = 0; /* Network loop restarted */ 159 static int NetDevExists = 0; /* At least one device configured */ 160 #endif 161 162 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */ 163 ushort NetOurVLAN = 0xFFFF; /* default is without VLAN */ 164 ushort NetOurNativeVLAN = 0xFFFF; /* ditto */ 165 166 char BootFile[128]; /* Boot File name */ 167 168 #if defined(CONFIG_CMD_PING) 169 IPaddr_t NetPingIP; /* the ip address to ping */ 170 171 static void PingStart(void); 172 #endif 173 174 #if defined(CONFIG_CMD_CDP) 175 static void CDPStart(void); 176 #endif 177 178 #if defined(CONFIG_CMD_SNTP) 179 IPaddr_t NetNtpServerIP; /* NTP server IP address */ 180 int NetTimeOffset=0; /* offset time from UTC */ 181 #endif 182 183 #ifdef CONFIG_NETCONSOLE 184 void NcStart(void); 185 int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len); 186 #endif 187 188 volatile uchar PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN]; 189 190 volatile uchar *NetRxPackets[PKTBUFSRX]; /* Receive packets */ 191 192 static rxhand_f *packetHandler; /* Current RX packet handler */ 193 static thand_f *timeHandler; /* Current timeout handler */ 194 static ulong timeStart; /* Time base value */ 195 static ulong timeDelta; /* Current timeout value */ 196 volatile uchar *NetTxPacket = 0; /* THE transmit packet */ 197 198 static int net_check_prereq (proto_t protocol); 199 200 /**********************************************************************/ 201 202 IPaddr_t NetArpWaitPacketIP; 203 IPaddr_t NetArpWaitReplyIP; 204 uchar *NetArpWaitPacketMAC; /* MAC address of waiting packet's destination */ 205 uchar *NetArpWaitTxPacket; /* THE transmit packet */ 206 int NetArpWaitTxPacketSize; 207 uchar NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN]; 208 ulong NetArpWaitTimerStart; 209 int NetArpWaitTry; 210 211 void ArpRequest (void) 212 { 213 int i; 214 volatile uchar *pkt; 215 ARP_t *arp; 216 217 debug("ARP broadcast %d\n", NetArpWaitTry); 218 219 pkt = NetTxPacket; 220 221 pkt += NetSetEther (pkt, NetBcastAddr, PROT_ARP); 222 223 arp = (ARP_t *) pkt; 224 225 arp->ar_hrd = htons (ARP_ETHER); 226 arp->ar_pro = htons (PROT_IP); 227 arp->ar_hln = 6; 228 arp->ar_pln = 4; 229 arp->ar_op = htons (ARPOP_REQUEST); 230 231 memcpy (&arp->ar_data[0], NetOurEther, 6); /* source ET addr */ 232 NetWriteIP ((uchar *) & arp->ar_data[6], NetOurIP); /* source IP addr */ 233 for (i = 10; i < 16; ++i) { 234 arp->ar_data[i] = 0; /* dest ET addr = 0 */ 235 } 236 237 if ((NetArpWaitPacketIP & NetOurSubnetMask) != 238 (NetOurIP & NetOurSubnetMask)) { 239 if (NetOurGatewayIP == 0) { 240 puts ("## Warning: gatewayip needed but not set\n"); 241 NetArpWaitReplyIP = NetArpWaitPacketIP; 242 } else { 243 NetArpWaitReplyIP = NetOurGatewayIP; 244 } 245 } else { 246 NetArpWaitReplyIP = NetArpWaitPacketIP; 247 } 248 249 NetWriteIP ((uchar *) & arp->ar_data[16], NetArpWaitReplyIP); 250 (void) eth_send (NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE); 251 } 252 253 void ArpTimeoutCheck(void) 254 { 255 ulong t; 256 257 if (!NetArpWaitPacketIP) 258 return; 259 260 t = get_timer(0); 261 262 /* check for arp timeout */ 263 if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT) { 264 NetArpWaitTry++; 265 266 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) { 267 puts ("\nARP Retry count exceeded; starting again\n"); 268 NetArpWaitTry = 0; 269 NetStartAgain(); 270 } else { 271 NetArpWaitTimerStart = t; 272 ArpRequest(); 273 } 274 } 275 } 276 277 static void 278 NetInitLoop(proto_t protocol) 279 { 280 static int env_changed_id = 0; 281 bd_t *bd = gd->bd; 282 int env_id = get_env_id (); 283 284 /* update only when the environment has changed */ 285 if (env_changed_id != env_id) { 286 NetCopyIP(&NetOurIP, &bd->bi_ip_addr); 287 NetOurGatewayIP = getenv_IPaddr ("gatewayip"); 288 NetOurSubnetMask= getenv_IPaddr ("netmask"); 289 NetServerIP = getenv_IPaddr ("serverip"); 290 NetOurNativeVLAN = getenv_VLAN("nvlan"); 291 NetOurVLAN = getenv_VLAN("vlan"); 292 #if defined(CONFIG_CMD_DNS) 293 NetOurDNSIP = getenv_IPaddr("dnsip"); 294 #endif 295 env_changed_id = env_id; 296 } 297 298 return; 299 } 300 301 /**********************************************************************/ 302 /* 303 * Main network processing loop. 304 */ 305 306 int 307 NetLoop(proto_t protocol) 308 { 309 bd_t *bd = gd->bd; 310 311 #ifdef CONFIG_NET_MULTI 312 NetRestarted = 0; 313 NetDevExists = 0; 314 #endif 315 316 /* XXX problem with bss workaround */ 317 NetArpWaitPacketMAC = NULL; 318 NetArpWaitTxPacket = NULL; 319 NetArpWaitPacketIP = 0; 320 NetArpWaitReplyIP = 0; 321 NetArpWaitTxPacket = NULL; 322 NetTxPacket = NULL; 323 324 if (!NetTxPacket) { 325 int i; 326 /* 327 * Setup packet buffers, aligned correctly. 328 */ 329 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1); 330 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN; 331 for (i = 0; i < PKTBUFSRX; i++) { 332 NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN; 333 } 334 } 335 336 if (!NetArpWaitTxPacket) { 337 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1); 338 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN; 339 NetArpWaitTxPacketSize = 0; 340 } 341 342 eth_halt(); 343 #ifdef CONFIG_NET_MULTI 344 eth_set_current(); 345 #endif 346 if (eth_init(bd) < 0) { 347 eth_halt(); 348 return(-1); 349 } 350 351 restart: 352 #ifdef CONFIG_NET_MULTI 353 memcpy (NetOurEther, eth_get_dev()->enetaddr, 6); 354 #else 355 eth_getenv_enetaddr("ethaddr", NetOurEther); 356 #endif 357 358 NetState = NETLOOP_CONTINUE; 359 360 /* 361 * Start the ball rolling with the given start function. From 362 * here on, this code is a state machine driven by received 363 * packets and timer events. 364 */ 365 NetInitLoop(protocol); 366 367 switch (net_check_prereq (protocol)) { 368 case 1: 369 /* network not configured */ 370 eth_halt(); 371 return (-1); 372 373 #ifdef CONFIG_NET_MULTI 374 case 2: 375 /* network device not configured */ 376 break; 377 #endif /* CONFIG_NET_MULTI */ 378 379 case 0: 380 #ifdef CONFIG_NET_MULTI 381 NetDevExists = 1; 382 #endif 383 switch (protocol) { 384 case TFTP: 385 /* always use ARP to get server ethernet address */ 386 TftpStart(); 387 break; 388 389 #if defined(CONFIG_CMD_DHCP) 390 case DHCP: 391 BootpTry = 0; 392 NetOurIP = 0; 393 DhcpRequest(); /* Basically same as BOOTP */ 394 break; 395 #endif 396 397 case BOOTP: 398 BootpTry = 0; 399 NetOurIP = 0; 400 BootpRequest (); 401 break; 402 403 case RARP: 404 RarpTry = 0; 405 NetOurIP = 0; 406 RarpRequest (); 407 break; 408 #if defined(CONFIG_CMD_PING) 409 case PING: 410 PingStart(); 411 break; 412 #endif 413 #if defined(CONFIG_CMD_NFS) 414 case NFS: 415 NfsStart(); 416 break; 417 #endif 418 #if defined(CONFIG_CMD_CDP) 419 case CDP: 420 CDPStart(); 421 break; 422 #endif 423 #ifdef CONFIG_NETCONSOLE 424 case NETCONS: 425 NcStart(); 426 break; 427 #endif 428 #if defined(CONFIG_CMD_SNTP) 429 case SNTP: 430 SntpStart(); 431 break; 432 #endif 433 #if defined(CONFIG_CMD_DNS) 434 case DNS: 435 DnsStart(); 436 break; 437 #endif 438 default: 439 break; 440 } 441 442 NetBootFileXferSize = 0; 443 break; 444 } 445 446 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 447 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && defined(CONFIG_STATUS_LED) && defined(STATUS_LED_RED) 448 /* 449 * Echo the inverted link state to the fault LED. 450 */ 451 if(miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) { 452 status_led_set (STATUS_LED_RED, STATUS_LED_OFF); 453 } else { 454 status_led_set (STATUS_LED_RED, STATUS_LED_ON); 455 } 456 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 457 #endif /* CONFIG_MII, ... */ 458 459 /* 460 * Main packet reception loop. Loop receiving packets until 461 * someone sets `NetState' to a state that terminates. 462 */ 463 for (;;) { 464 WATCHDOG_RESET(); 465 #ifdef CONFIG_SHOW_ACTIVITY 466 { 467 extern void show_activity(int arg); 468 show_activity(1); 469 } 470 #endif 471 /* 472 * Check the ethernet for a new packet. The ethernet 473 * receive routine will process it. 474 */ 475 eth_rx(); 476 477 /* 478 * Abort if ctrl-c was pressed. 479 */ 480 if (ctrlc()) { 481 eth_halt(); 482 puts ("\nAbort\n"); 483 return (-1); 484 } 485 486 ArpTimeoutCheck(); 487 488 /* 489 * Check for a timeout, and run the timeout handler 490 * if we have one. 491 */ 492 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) { 493 thand_f *x; 494 495 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 496 # if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ 497 defined(CONFIG_STATUS_LED) && \ 498 defined(STATUS_LED_RED) 499 /* 500 * Echo the inverted link state to the fault LED. 501 */ 502 if(miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) { 503 status_led_set (STATUS_LED_RED, STATUS_LED_OFF); 504 } else { 505 status_led_set (STATUS_LED_RED, STATUS_LED_ON); 506 } 507 # endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 508 #endif /* CONFIG_MII, ... */ 509 x = timeHandler; 510 timeHandler = (thand_f *)0; 511 (*x)(); 512 } 513 514 515 switch (NetState) { 516 517 case NETLOOP_RESTART: 518 #ifdef CONFIG_NET_MULTI 519 NetRestarted = 1; 520 #endif 521 goto restart; 522 523 case NETLOOP_SUCCESS: 524 if (NetBootFileXferSize > 0) { 525 char buf[20]; 526 printf("Bytes transferred = %ld (%lx hex)\n", 527 NetBootFileXferSize, 528 NetBootFileXferSize); 529 sprintf(buf, "%lX", NetBootFileXferSize); 530 setenv("filesize", buf); 531 532 sprintf(buf, "%lX", (unsigned long)load_addr); 533 setenv("fileaddr", buf); 534 } 535 eth_halt(); 536 return NetBootFileXferSize; 537 538 case NETLOOP_FAIL: 539 return (-1); 540 } 541 } 542 } 543 544 /**********************************************************************/ 545 546 static void 547 startAgainTimeout(void) 548 { 549 NetState = NETLOOP_RESTART; 550 } 551 552 static void 553 startAgainHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len) 554 { 555 /* Totally ignore the packet */ 556 } 557 558 void NetStartAgain (void) 559 { 560 char *nretry; 561 int noretry = 0, once = 0; 562 563 if ((nretry = getenv ("netretry")) != NULL) { 564 noretry = (strcmp (nretry, "no") == 0); 565 once = (strcmp (nretry, "once") == 0); 566 } 567 if (noretry) { 568 eth_halt (); 569 NetState = NETLOOP_FAIL; 570 return; 571 } 572 #ifndef CONFIG_NET_MULTI 573 NetSetTimeout (10000UL, startAgainTimeout); 574 NetSetHandler (startAgainHandler); 575 #else /* !CONFIG_NET_MULTI*/ 576 eth_halt (); 577 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER) 578 eth_try_another (!NetRestarted); 579 #endif 580 eth_init (gd->bd); 581 if (NetRestartWrap) { 582 NetRestartWrap = 0; 583 if (NetDevExists && !once) { 584 NetSetTimeout (10000UL, startAgainTimeout); 585 NetSetHandler (startAgainHandler); 586 } else { 587 NetState = NETLOOP_FAIL; 588 } 589 } else { 590 NetState = NETLOOP_RESTART; 591 } 592 #endif /* CONFIG_NET_MULTI */ 593 } 594 595 /**********************************************************************/ 596 /* 597 * Miscelaneous bits. 598 */ 599 600 void 601 NetSetHandler(rxhand_f * f) 602 { 603 packetHandler = f; 604 } 605 606 607 void 608 NetSetTimeout(ulong iv, thand_f * f) 609 { 610 if (iv == 0) { 611 timeHandler = (thand_f *)0; 612 } else { 613 timeHandler = f; 614 timeStart = get_timer(0); 615 timeDelta = iv; 616 } 617 } 618 619 620 void 621 NetSendPacket(volatile uchar * pkt, int len) 622 { 623 (void) eth_send(pkt, len); 624 } 625 626 int 627 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len) 628 { 629 uchar *pkt; 630 631 /* convert to new style broadcast */ 632 if (dest == 0) 633 dest = 0xFFFFFFFF; 634 635 /* if broadcast, make the ether address a broadcast and don't do ARP */ 636 if (dest == 0xFFFFFFFF) 637 ether = NetBcastAddr; 638 639 /* if MAC address was not discovered yet, save the packet and do an ARP request */ 640 if (memcmp(ether, NetEtherNullAddr, 6) == 0) { 641 642 debug("sending ARP for %08lx\n", dest); 643 644 NetArpWaitPacketIP = dest; 645 NetArpWaitPacketMAC = ether; 646 647 pkt = NetArpWaitTxPacket; 648 pkt += NetSetEther (pkt, NetArpWaitPacketMAC, PROT_IP); 649 650 NetSetIP (pkt, dest, dport, sport, len); 651 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len); 652 653 /* size of the waiting packet */ 654 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE + len; 655 656 /* and do the ARP request */ 657 NetArpWaitTry = 1; 658 NetArpWaitTimerStart = get_timer(0); 659 ArpRequest(); 660 return 1; /* waiting */ 661 } 662 663 debug("sending UDP to %08lx/%pM\n", dest, ether); 664 665 pkt = (uchar *)NetTxPacket; 666 pkt += NetSetEther (pkt, ether, PROT_IP); 667 NetSetIP (pkt, dest, dport, sport, len); 668 (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len); 669 670 return 0; /* transmitted */ 671 } 672 673 #if defined(CONFIG_CMD_PING) 674 static ushort PingSeqNo; 675 676 int PingSend(void) 677 { 678 static uchar mac[6]; 679 volatile IP_t *ip; 680 volatile ushort *s; 681 uchar *pkt; 682 683 /* XXX always send arp request */ 684 685 memcpy(mac, NetEtherNullAddr, 6); 686 687 debug("sending ARP for %08lx\n", NetPingIP); 688 689 NetArpWaitPacketIP = NetPingIP; 690 NetArpWaitPacketMAC = mac; 691 692 pkt = NetArpWaitTxPacket; 693 pkt += NetSetEther(pkt, mac, PROT_IP); 694 695 ip = (volatile IP_t *)pkt; 696 697 /* 698 * Construct an IP and ICMP header. (need to set no fragment bit - XXX) 699 */ 700 ip->ip_hl_v = 0x45; /* IP_HDR_SIZE / 4 (not including UDP) */ 701 ip->ip_tos = 0; 702 ip->ip_len = htons(IP_HDR_SIZE_NO_UDP + 8); 703 ip->ip_id = htons(NetIPID++); 704 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ 705 ip->ip_ttl = 255; 706 ip->ip_p = 0x01; /* ICMP */ 707 ip->ip_sum = 0; 708 NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */ 709 NetCopyIP((void*)&ip->ip_dst, &NetPingIP); /* - "" - */ 710 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2); 711 712 s = &ip->udp_src; /* XXX ICMP starts here */ 713 s[0] = htons(0x0800); /* echo-request, code */ 714 s[1] = 0; /* checksum */ 715 s[2] = 0; /* identifier */ 716 s[3] = htons(PingSeqNo++); /* sequence number */ 717 s[1] = ~NetCksum((uchar *)s, 8/2); 718 719 /* size of the waiting packet */ 720 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8; 721 722 /* and do the ARP request */ 723 NetArpWaitTry = 1; 724 NetArpWaitTimerStart = get_timer(0); 725 ArpRequest(); 726 return 1; /* waiting */ 727 } 728 729 static void 730 PingTimeout (void) 731 { 732 eth_halt(); 733 NetState = NETLOOP_FAIL; /* we did not get the reply */ 734 } 735 736 static void 737 PingHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len) 738 { 739 IPaddr_t tmp; 740 volatile IP_t *ip = (volatile IP_t *)pkt; 741 742 tmp = NetReadIP((void *)&ip->ip_src); 743 if (tmp != NetPingIP) 744 return; 745 746 NetState = NETLOOP_SUCCESS; 747 } 748 749 static void PingStart(void) 750 { 751 #if defined(CONFIG_NET_MULTI) 752 printf ("Using %s device\n", eth_get_name()); 753 #endif /* CONFIG_NET_MULTI */ 754 NetSetTimeout (10000UL, PingTimeout); 755 NetSetHandler (PingHandler); 756 757 PingSend(); 758 } 759 #endif 760 761 #if defined(CONFIG_CMD_CDP) 762 763 #define CDP_DEVICE_ID_TLV 0x0001 764 #define CDP_ADDRESS_TLV 0x0002 765 #define CDP_PORT_ID_TLV 0x0003 766 #define CDP_CAPABILITIES_TLV 0x0004 767 #define CDP_VERSION_TLV 0x0005 768 #define CDP_PLATFORM_TLV 0x0006 769 #define CDP_NATIVE_VLAN_TLV 0x000a 770 #define CDP_APPLIANCE_VLAN_TLV 0x000e 771 #define CDP_TRIGGER_TLV 0x000f 772 #define CDP_POWER_CONSUMPTION_TLV 0x0010 773 #define CDP_SYSNAME_TLV 0x0014 774 #define CDP_SYSOBJECT_TLV 0x0015 775 #define CDP_MANAGEMENT_ADDRESS_TLV 0x0016 776 777 #define CDP_TIMEOUT 250UL /* one packet every 250ms */ 778 779 static int CDPSeq; 780 static int CDPOK; 781 782 ushort CDPNativeVLAN; 783 ushort CDPApplianceVLAN; 784 785 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 0x00 }; 786 787 static ushort CDP_compute_csum(const uchar *buff, ushort len) 788 { 789 ushort csum; 790 int odd; 791 ulong result = 0; 792 ushort leftover; 793 ushort *p; 794 795 if (len > 0) { 796 odd = 1 & (ulong)buff; 797 if (odd) { 798 result = *buff << 8; 799 len--; 800 buff++; 801 } 802 while (len > 1) { 803 p = (ushort *)buff; 804 result += *p++; 805 buff = (uchar *)p; 806 if (result & 0x80000000) 807 result = (result & 0xFFFF) + (result >> 16); 808 len -= 2; 809 } 810 if (len) { 811 leftover = (signed short)(*(const signed char *)buff); 812 /* CISCO SUCKS big time! (and blows too): 813 * CDP uses the IP checksum algorithm with a twist; 814 * for the last byte it *sign* extends and sums. 815 */ 816 result = (result & 0xffff0000) | ((result + leftover) & 0x0000ffff); 817 } 818 while (result >> 16) 819 result = (result & 0xFFFF) + (result >> 16); 820 821 if (odd) 822 result = ((result >> 8) & 0xff) | ((result & 0xff) << 8); 823 } 824 825 /* add up 16-bit and 17-bit words for 17+c bits */ 826 result = (result & 0xffff) + (result >> 16); 827 /* add up 16-bit and 2-bit for 16+c bit */ 828 result = (result & 0xffff) + (result >> 16); 829 /* add up carry.. */ 830 result = (result & 0xffff) + (result >> 16); 831 832 /* negate */ 833 csum = ~(ushort)result; 834 835 /* run time endian detection */ 836 if (csum != htons(csum)) /* little endian */ 837 csum = htons(csum); 838 839 return csum; 840 } 841 842 int CDPSendTrigger(void) 843 { 844 volatile uchar *pkt; 845 volatile ushort *s; 846 volatile ushort *cp; 847 Ethernet_t *et; 848 int len; 849 ushort chksum; 850 #if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID) || \ 851 defined(CONFIG_CDP_VERSION) || defined(CONFIG_CDP_PLATFORM) 852 char buf[32]; 853 #endif 854 855 pkt = NetTxPacket; 856 et = (Ethernet_t *)pkt; 857 858 /* NOTE: trigger sent not on any VLAN */ 859 860 /* form ethernet header */ 861 memcpy(et->et_dest, NetCDPAddr, 6); 862 memcpy(et->et_src, NetOurEther, 6); 863 864 pkt += ETHER_HDR_SIZE; 865 866 /* SNAP header */ 867 memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)); 868 pkt += sizeof(CDP_SNAP_hdr); 869 870 /* CDP header */ 871 *pkt++ = 0x02; /* CDP version 2 */ 872 *pkt++ = 180; /* TTL */ 873 s = (volatile ushort *)pkt; 874 cp = s; 875 *s++ = htons(0); /* checksum (0 for later calculation) */ 876 877 /* CDP fields */ 878 #ifdef CONFIG_CDP_DEVICE_ID 879 *s++ = htons(CDP_DEVICE_ID_TLV); 880 *s++ = htons(CONFIG_CDP_DEVICE_ID); 881 sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%pm", NetOurEther); 882 memcpy((uchar *)s, buf, 16); 883 s += 16 / 2; 884 #endif 885 886 #ifdef CONFIG_CDP_PORT_ID 887 *s++ = htons(CDP_PORT_ID_TLV); 888 memset(buf, 0, sizeof(buf)); 889 sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index()); 890 len = strlen(buf); 891 if (len & 1) /* make it even */ 892 len++; 893 *s++ = htons(len + 4); 894 memcpy((uchar *)s, buf, len); 895 s += len / 2; 896 #endif 897 898 #ifdef CONFIG_CDP_CAPABILITIES 899 *s++ = htons(CDP_CAPABILITIES_TLV); 900 *s++ = htons(8); 901 *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES); 902 s += 2; 903 #endif 904 905 #ifdef CONFIG_CDP_VERSION 906 *s++ = htons(CDP_VERSION_TLV); 907 memset(buf, 0, sizeof(buf)); 908 strcpy(buf, CONFIG_CDP_VERSION); 909 len = strlen(buf); 910 if (len & 1) /* make it even */ 911 len++; 912 *s++ = htons(len + 4); 913 memcpy((uchar *)s, buf, len); 914 s += len / 2; 915 #endif 916 917 #ifdef CONFIG_CDP_PLATFORM 918 *s++ = htons(CDP_PLATFORM_TLV); 919 memset(buf, 0, sizeof(buf)); 920 strcpy(buf, CONFIG_CDP_PLATFORM); 921 len = strlen(buf); 922 if (len & 1) /* make it even */ 923 len++; 924 *s++ = htons(len + 4); 925 memcpy((uchar *)s, buf, len); 926 s += len / 2; 927 #endif 928 929 #ifdef CONFIG_CDP_TRIGGER 930 *s++ = htons(CDP_TRIGGER_TLV); 931 *s++ = htons(8); 932 *(ulong *)s = htonl(CONFIG_CDP_TRIGGER); 933 s += 2; 934 #endif 935 936 #ifdef CONFIG_CDP_POWER_CONSUMPTION 937 *s++ = htons(CDP_POWER_CONSUMPTION_TLV); 938 *s++ = htons(6); 939 *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION); 940 #endif 941 942 /* length of ethernet packet */ 943 len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE); 944 et->et_protlen = htons(len); 945 946 len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr); 947 chksum = CDP_compute_csum((uchar *)NetTxPacket + len, (uchar *)s - (NetTxPacket + len)); 948 if (chksum == 0) 949 chksum = 0xFFFF; 950 *cp = htons(chksum); 951 952 (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket); 953 return 0; 954 } 955 956 static void 957 CDPTimeout (void) 958 { 959 CDPSeq++; 960 961 if (CDPSeq < 3) { 962 NetSetTimeout (CDP_TIMEOUT, CDPTimeout); 963 CDPSendTrigger(); 964 return; 965 } 966 967 /* if not OK try again */ 968 if (!CDPOK) 969 NetStartAgain(); 970 else 971 NetState = NETLOOP_SUCCESS; 972 } 973 974 static void 975 CDPDummyHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len) 976 { 977 /* nothing */ 978 } 979 980 static void 981 CDPHandler(const uchar * pkt, unsigned len) 982 { 983 const uchar *t; 984 const ushort *ss; 985 ushort type, tlen; 986 uchar applid; 987 ushort vlan, nvlan; 988 989 /* minimum size? */ 990 if (len < sizeof(CDP_SNAP_hdr) + 4) 991 goto pkt_short; 992 993 /* check for valid CDP SNAP header */ 994 if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0) 995 return; 996 997 pkt += sizeof(CDP_SNAP_hdr); 998 len -= sizeof(CDP_SNAP_hdr); 999 1000 /* Version of CDP protocol must be >= 2 and TTL != 0 */ 1001 if (pkt[0] < 0x02 || pkt[1] == 0) 1002 return; 1003 1004 /* if version is greater than 0x02 maybe we'll have a problem; output a warning */ 1005 if (pkt[0] != 0x02) 1006 printf("** WARNING: CDP packet received with a protocol version %d > 2\n", 1007 pkt[0] & 0xff); 1008 1009 if (CDP_compute_csum(pkt, len) != 0) 1010 return; 1011 1012 pkt += 4; 1013 len -= 4; 1014 1015 vlan = htons(-1); 1016 nvlan = htons(-1); 1017 while (len > 0) { 1018 if (len < 4) 1019 goto pkt_short; 1020 1021 ss = (const ushort *)pkt; 1022 type = ntohs(ss[0]); 1023 tlen = ntohs(ss[1]); 1024 if (tlen > len) { 1025 goto pkt_short; 1026 } 1027 1028 pkt += tlen; 1029 len -= tlen; 1030 1031 ss += 2; /* point ss to the data of the TLV */ 1032 tlen -= 4; 1033 1034 switch (type) { 1035 case CDP_DEVICE_ID_TLV: 1036 break; 1037 case CDP_ADDRESS_TLV: 1038 break; 1039 case CDP_PORT_ID_TLV: 1040 break; 1041 case CDP_CAPABILITIES_TLV: 1042 break; 1043 case CDP_VERSION_TLV: 1044 break; 1045 case CDP_PLATFORM_TLV: 1046 break; 1047 case CDP_NATIVE_VLAN_TLV: 1048 nvlan = *ss; 1049 break; 1050 case CDP_APPLIANCE_VLAN_TLV: 1051 t = (const uchar *)ss; 1052 while (tlen > 0) { 1053 if (tlen < 3) 1054 goto pkt_short; 1055 1056 applid = t[0]; 1057 ss = (const ushort *)(t + 1); 1058 1059 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE 1060 if (applid == CONFIG_CDP_APPLIANCE_VLAN_TYPE) 1061 vlan = *ss; 1062 #else 1063 vlan = ntohs(*ss); /* XXX will this work; dunno */ 1064 #endif 1065 t += 3; tlen -= 3; 1066 } 1067 break; 1068 case CDP_TRIGGER_TLV: 1069 break; 1070 case CDP_POWER_CONSUMPTION_TLV: 1071 break; 1072 case CDP_SYSNAME_TLV: 1073 break; 1074 case CDP_SYSOBJECT_TLV: 1075 break; 1076 case CDP_MANAGEMENT_ADDRESS_TLV: 1077 break; 1078 } 1079 } 1080 1081 CDPApplianceVLAN = vlan; 1082 CDPNativeVLAN = nvlan; 1083 1084 CDPOK = 1; 1085 return; 1086 1087 pkt_short: 1088 printf("** CDP packet is too short\n"); 1089 return; 1090 } 1091 1092 static void CDPStart(void) 1093 { 1094 #if defined(CONFIG_NET_MULTI) 1095 printf ("Using %s device\n", eth_get_name()); 1096 #endif 1097 CDPSeq = 0; 1098 CDPOK = 0; 1099 1100 CDPNativeVLAN = htons(-1); 1101 CDPApplianceVLAN = htons(-1); 1102 1103 NetSetTimeout (CDP_TIMEOUT, CDPTimeout); 1104 NetSetHandler (CDPDummyHandler); 1105 1106 CDPSendTrigger(); 1107 } 1108 #endif 1109 1110 #ifdef CONFIG_IP_DEFRAG 1111 /* 1112 * This function collects fragments in a single packet, according 1113 * to the algorithm in RFC815. It returns NULL or the pointer to 1114 * a complete packet, in static storage 1115 */ 1116 #ifndef CONFIG_NET_MAXDEFRAG 1117 #define CONFIG_NET_MAXDEFRAG 16384 1118 #endif 1119 /* 1120 * MAXDEFRAG, above, is chosen in the config file and is real data 1121 * so we need to add the NFS overhead, which is more than TFTP. 1122 * To use sizeof in the internal unnamed structures, we need a real 1123 * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately). 1124 * The compiler doesn't complain nor allocates the actual structure 1125 */ 1126 static struct rpc_t rpc_specimen; 1127 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply)) 1128 1129 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE_NO_UDP) 1130 1131 /* 1132 * this is the packet being assembled, either data or frag control. 1133 * Fragments go by 8 bytes, so this union must be 8 bytes long 1134 */ 1135 struct hole { 1136 /* first_byte is address of this structure */ 1137 u16 last_byte; /* last byte in this hole + 1 (begin of next hole) */ 1138 u16 next_hole; /* index of next (in 8-b blocks), 0 == none */ 1139 u16 prev_hole; /* index of prev, 0 == none */ 1140 u16 unused; 1141 }; 1142 1143 static IP_t *__NetDefragment(IP_t *ip, int *lenp) 1144 { 1145 static uchar pkt_buff[IP_PKTSIZE] __attribute__((aligned(PKTALIGN))); 1146 static u16 first_hole, total_len; 1147 struct hole *payload, *thisfrag, *h, *newh; 1148 IP_t *localip = (IP_t *)pkt_buff; 1149 uchar *indata = (uchar *)ip; 1150 int offset8, start, len, done = 0; 1151 u16 ip_off = ntohs(ip->ip_off); 1152 1153 /* payload starts after IP header, this fragment is in there */ 1154 payload = (struct hole *)(pkt_buff + IP_HDR_SIZE_NO_UDP); 1155 offset8 = (ip_off & IP_OFFS); 1156 thisfrag = payload + offset8; 1157 start = offset8 * 8; 1158 len = ntohs(ip->ip_len) - IP_HDR_SIZE_NO_UDP; 1159 1160 if (start + len > IP_MAXUDP) /* fragment extends too far */ 1161 return NULL; 1162 1163 if (!total_len || localip->ip_id != ip->ip_id) { 1164 /* new (or different) packet, reset structs */ 1165 total_len = 0xffff; 1166 payload[0].last_byte = ~0; 1167 payload[0].next_hole = 0; 1168 payload[0].prev_hole = 0; 1169 first_hole = 0; 1170 /* any IP header will work, copy the first we received */ 1171 memcpy(localip, ip, IP_HDR_SIZE_NO_UDP); 1172 } 1173 1174 /* 1175 * What follows is the reassembly algorithm. We use the payload 1176 * array as a linked list of hole descriptors, as each hole starts 1177 * at a multiple of 8 bytes. However, last byte can be whatever value, 1178 * so it is represented as byte count, not as 8-byte blocks. 1179 */ 1180 1181 h = payload + first_hole; 1182 while (h->last_byte < start) { 1183 if (!h->next_hole) { 1184 /* no hole that far away */ 1185 return NULL; 1186 } 1187 h = payload + h->next_hole; 1188 } 1189 1190 if (offset8 + (len / 8) <= h - payload) { 1191 /* no overlap with holes (dup fragment?) */ 1192 return NULL; 1193 } 1194 1195 if (!(ip_off & IP_FLAGS_MFRAG)) { 1196 /* no more fragmentss: truncate this (last) hole */ 1197 total_len = start + len; 1198 h->last_byte = start + len; 1199 } 1200 1201 /* 1202 * There is some overlap: fix the hole list. This code doesn't 1203 * deal with a fragment that overlaps with two different holes 1204 * (thus being a superset of a previously-received fragment). 1205 */ 1206 1207 if ( (h >= thisfrag) && (h->last_byte <= start + len) ) { 1208 /* complete overlap with hole: remove hole */ 1209 if (!h->prev_hole && !h->next_hole) { 1210 /* last remaining hole */ 1211 done = 1; 1212 } else if (!h->prev_hole) { 1213 /* first hole */ 1214 first_hole = h->next_hole; 1215 payload[h->next_hole].prev_hole = 0; 1216 } else if (!h->next_hole) { 1217 /* last hole */ 1218 payload[h->prev_hole].next_hole = 0; 1219 } else { 1220 /* in the middle of the list */ 1221 payload[h->next_hole].prev_hole = h->prev_hole; 1222 payload[h->prev_hole].next_hole = h->next_hole; 1223 } 1224 1225 } else if (h->last_byte <= start + len) { 1226 /* overlaps with final part of the hole: shorten this hole */ 1227 h->last_byte = start; 1228 1229 } else if (h >= thisfrag) { 1230 /* overlaps with initial part of the hole: move this hole */ 1231 newh = thisfrag + (len / 8); 1232 *newh = *h; 1233 h = newh; 1234 if (h->next_hole) 1235 payload[h->next_hole].prev_hole = (h - payload); 1236 if (h->prev_hole) 1237 payload[h->prev_hole].next_hole = (h - payload); 1238 else 1239 first_hole = (h - payload); 1240 1241 } else { 1242 /* fragment sits in the middle: split the hole */ 1243 newh = thisfrag + (len / 8); 1244 *newh = *h; 1245 h->last_byte = start; 1246 h->next_hole = (newh - payload); 1247 newh->prev_hole = (h - payload); 1248 if (newh->next_hole) 1249 payload[newh->next_hole].prev_hole = (newh - payload); 1250 } 1251 1252 /* finally copy this fragment and possibly return whole packet */ 1253 memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE_NO_UDP, len); 1254 if (!done) 1255 return NULL; 1256 1257 localip->ip_len = htons(total_len); 1258 *lenp = total_len + IP_HDR_SIZE_NO_UDP; 1259 return localip; 1260 } 1261 1262 static inline IP_t *NetDefragment(IP_t *ip, int *lenp) 1263 { 1264 u16 ip_off = ntohs(ip->ip_off); 1265 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) 1266 return ip; /* not a fragment */ 1267 return __NetDefragment(ip, lenp); 1268 } 1269 1270 #else /* !CONFIG_IP_DEFRAG */ 1271 1272 static inline IP_t *NetDefragment(IP_t *ip, int *lenp) 1273 { 1274 u16 ip_off = ntohs(ip->ip_off); 1275 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) 1276 return ip; /* not a fragment */ 1277 return NULL; 1278 } 1279 #endif 1280 1281 void 1282 NetReceive(volatile uchar * inpkt, int len) 1283 { 1284 Ethernet_t *et; 1285 IP_t *ip; 1286 ARP_t *arp; 1287 IPaddr_t tmp; 1288 int x; 1289 uchar *pkt; 1290 #if defined(CONFIG_CMD_CDP) 1291 int iscdp; 1292 #endif 1293 ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid; 1294 1295 debug("packet received\n"); 1296 1297 NetRxPacket = inpkt; 1298 NetRxPacketLen = len; 1299 et = (Ethernet_t *)inpkt; 1300 1301 /* too small packet? */ 1302 if (len < ETHER_HDR_SIZE) 1303 return; 1304 1305 #ifdef CONFIG_API 1306 if (push_packet) { 1307 (*push_packet)(inpkt, len); 1308 return; 1309 } 1310 #endif 1311 1312 #if defined(CONFIG_CMD_CDP) 1313 /* keep track if packet is CDP */ 1314 iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0; 1315 #endif 1316 1317 myvlanid = ntohs(NetOurVLAN); 1318 if (myvlanid == (ushort)-1) 1319 myvlanid = VLAN_NONE; 1320 mynvlanid = ntohs(NetOurNativeVLAN); 1321 if (mynvlanid == (ushort)-1) 1322 mynvlanid = VLAN_NONE; 1323 1324 x = ntohs(et->et_protlen); 1325 1326 debug("packet received\n"); 1327 1328 if (x < 1514) { 1329 /* 1330 * Got a 802 packet. Check the other protocol field. 1331 */ 1332 x = ntohs(et->et_prot); 1333 1334 ip = (IP_t *)(inpkt + E802_HDR_SIZE); 1335 len -= E802_HDR_SIZE; 1336 1337 } else if (x != PROT_VLAN) { /* normal packet */ 1338 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE); 1339 len -= ETHER_HDR_SIZE; 1340 1341 } else { /* VLAN packet */ 1342 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et; 1343 1344 debug("VLAN packet received\n"); 1345 1346 /* too small packet? */ 1347 if (len < VLAN_ETHER_HDR_SIZE) 1348 return; 1349 1350 /* if no VLAN active */ 1351 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE 1352 #if defined(CONFIG_CMD_CDP) 1353 && iscdp == 0 1354 #endif 1355 ) 1356 return; 1357 1358 cti = ntohs(vet->vet_tag); 1359 vlanid = cti & VLAN_IDMASK; 1360 x = ntohs(vet->vet_type); 1361 1362 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE); 1363 len -= VLAN_ETHER_HDR_SIZE; 1364 } 1365 1366 debug("Receive from protocol 0x%x\n", x); 1367 1368 #if defined(CONFIG_CMD_CDP) 1369 if (iscdp) { 1370 CDPHandler((uchar *)ip, len); 1371 return; 1372 } 1373 #endif 1374 1375 if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) { 1376 if (vlanid == VLAN_NONE) 1377 vlanid = (mynvlanid & VLAN_IDMASK); 1378 /* not matched? */ 1379 if (vlanid != (myvlanid & VLAN_IDMASK)) 1380 return; 1381 } 1382 1383 switch (x) { 1384 1385 case PROT_ARP: 1386 /* 1387 * We have to deal with two types of ARP packets: 1388 * - REQUEST packets will be answered by sending our 1389 * IP address - if we know it. 1390 * - REPLY packates are expected only after we asked 1391 * for the TFTP server's or the gateway's ethernet 1392 * address; so if we receive such a packet, we set 1393 * the server ethernet address 1394 */ 1395 debug("Got ARP\n"); 1396 1397 arp = (ARP_t *)ip; 1398 if (len < ARP_HDR_SIZE) { 1399 printf("bad length %d < %d\n", len, ARP_HDR_SIZE); 1400 return; 1401 } 1402 if (ntohs(arp->ar_hrd) != ARP_ETHER) { 1403 return; 1404 } 1405 if (ntohs(arp->ar_pro) != PROT_IP) { 1406 return; 1407 } 1408 if (arp->ar_hln != 6) { 1409 return; 1410 } 1411 if (arp->ar_pln != 4) { 1412 return; 1413 } 1414 1415 if (NetOurIP == 0) { 1416 return; 1417 } 1418 1419 if (NetReadIP(&arp->ar_data[16]) != NetOurIP) { 1420 return; 1421 } 1422 1423 switch (ntohs(arp->ar_op)) { 1424 case ARPOP_REQUEST: /* reply with our IP address */ 1425 debug("Got ARP REQUEST, return our IP\n"); 1426 pkt = (uchar *)et; 1427 pkt += NetSetEther(pkt, et->et_src, PROT_ARP); 1428 arp->ar_op = htons(ARPOP_REPLY); 1429 memcpy (&arp->ar_data[10], &arp->ar_data[0], 6); 1430 NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]); 1431 memcpy (&arp->ar_data[ 0], NetOurEther, 6); 1432 NetCopyIP(&arp->ar_data[ 6], &NetOurIP); 1433 (void) eth_send((uchar *)et, (pkt - (uchar *)et) + ARP_HDR_SIZE); 1434 return; 1435 1436 case ARPOP_REPLY: /* arp reply */ 1437 /* are we waiting for a reply */ 1438 if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC) 1439 break; 1440 1441 #ifdef CONFIG_KEEP_SERVERADDR 1442 if (NetServerIP == NetArpWaitPacketIP) { 1443 char buf[20]; 1444 sprintf(buf, "%pM", arp->ar_data); 1445 setenv("serveraddr", buf); 1446 } 1447 #endif 1448 1449 debug("Got ARP REPLY, set server/gtwy eth addr (%pM)\n", 1450 arp->ar_data); 1451 1452 tmp = NetReadIP(&arp->ar_data[6]); 1453 1454 /* matched waiting packet's address */ 1455 if (tmp == NetArpWaitReplyIP) { 1456 debug("Got it\n"); 1457 /* save address for later use */ 1458 memcpy(NetArpWaitPacketMAC, &arp->ar_data[0], 6); 1459 1460 #ifdef CONFIG_NETCONSOLE 1461 (*packetHandler)(0,0,0,0); 1462 #endif 1463 /* modify header, and transmit it */ 1464 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6); 1465 (void) eth_send(NetArpWaitTxPacket, NetArpWaitTxPacketSize); 1466 1467 /* no arp request pending now */ 1468 NetArpWaitPacketIP = 0; 1469 NetArpWaitTxPacketSize = 0; 1470 NetArpWaitPacketMAC = NULL; 1471 1472 } 1473 return; 1474 default: 1475 debug("Unexpected ARP opcode 0x%x\n", ntohs(arp->ar_op)); 1476 return; 1477 } 1478 break; 1479 1480 case PROT_RARP: 1481 debug("Got RARP\n"); 1482 arp = (ARP_t *)ip; 1483 if (len < ARP_HDR_SIZE) { 1484 printf("bad length %d < %d\n", len, ARP_HDR_SIZE); 1485 return; 1486 } 1487 1488 if ((ntohs(arp->ar_op) != RARPOP_REPLY) || 1489 (ntohs(arp->ar_hrd) != ARP_ETHER) || 1490 (ntohs(arp->ar_pro) != PROT_IP) || 1491 (arp->ar_hln != 6) || (arp->ar_pln != 4)) { 1492 1493 puts ("invalid RARP header\n"); 1494 } else { 1495 NetCopyIP(&NetOurIP, &arp->ar_data[16]); 1496 if (NetServerIP == 0) 1497 NetCopyIP(&NetServerIP, &arp->ar_data[ 6]); 1498 memcpy (NetServerEther, &arp->ar_data[ 0], 6); 1499 1500 (*packetHandler)(0,0,0,0); 1501 } 1502 break; 1503 1504 case PROT_IP: 1505 debug("Got IP\n"); 1506 /* Before we start poking the header, make sure it is there */ 1507 if (len < IP_HDR_SIZE) { 1508 debug("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE); 1509 return; 1510 } 1511 /* Check the packet length */ 1512 if (len < ntohs(ip->ip_len)) { 1513 printf("len bad %d < %d\n", len, ntohs(ip->ip_len)); 1514 return; 1515 } 1516 len = ntohs(ip->ip_len); 1517 debug("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff); 1518 1519 /* Can't deal with anything except IPv4 */ 1520 if ((ip->ip_hl_v & 0xf0) != 0x40) { 1521 return; 1522 } 1523 /* Can't deal with IP options (headers != 20 bytes) */ 1524 if ((ip->ip_hl_v & 0x0f) > 0x05) { 1525 return; 1526 } 1527 /* Check the Checksum of the header */ 1528 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) { 1529 puts ("checksum bad\n"); 1530 return; 1531 } 1532 /* If it is not for us, ignore it */ 1533 tmp = NetReadIP(&ip->ip_dst); 1534 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) { 1535 #ifdef CONFIG_MCAST_TFTP 1536 if (Mcast_addr != tmp) 1537 #endif 1538 return; 1539 } 1540 /* 1541 * The function returns the unchanged packet if it's not 1542 * a fragment, and either the complete packet or NULL if 1543 * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL) 1544 */ 1545 if (!(ip = NetDefragment(ip, &len))) 1546 return; 1547 /* 1548 * watch for ICMP host redirects 1549 * 1550 * There is no real handler code (yet). We just watch 1551 * for ICMP host redirect messages. In case anybody 1552 * sees these messages: please contact me 1553 * (wd@denx.de), or - even better - send me the 1554 * necessary fixes :-) 1555 * 1556 * Note: in all cases where I have seen this so far 1557 * it was a problem with the router configuration, 1558 * for instance when a router was configured in the 1559 * BOOTP reply, but the TFTP server was on the same 1560 * subnet. So this is probably a warning that your 1561 * configuration might be wrong. But I'm not really 1562 * sure if there aren't any other situations. 1563 */ 1564 if (ip->ip_p == IPPROTO_ICMP) { 1565 ICMP_t *icmph = (ICMP_t *)&(ip->udp_src); 1566 1567 switch (icmph->type) { 1568 case ICMP_REDIRECT: 1569 if (icmph->code != ICMP_REDIR_HOST) 1570 return; 1571 printf (" ICMP Host Redirect to %pI4 ", &icmph->un.gateway); 1572 return; 1573 #if defined(CONFIG_CMD_PING) 1574 case ICMP_ECHO_REPLY: 1575 /* 1576 * IP header OK. Pass the packet to the current handler. 1577 */ 1578 /* XXX point to ip packet */ 1579 (*packetHandler)((uchar *)ip, 0, 0, 0); 1580 return; 1581 case ICMP_ECHO_REQUEST: 1582 debug("Got ICMP ECHO REQUEST, return %d bytes \n", 1583 ETHER_HDR_SIZE + len); 1584 1585 memcpy (&et->et_dest[0], &et->et_src[0], 6); 1586 memcpy (&et->et_src[ 0], NetOurEther, 6); 1587 1588 ip->ip_sum = 0; 1589 ip->ip_off = 0; 1590 NetCopyIP((void*)&ip->ip_dst, &ip->ip_src); 1591 NetCopyIP((void*)&ip->ip_src, &NetOurIP); 1592 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP >> 1); 1593 1594 icmph->type = ICMP_ECHO_REPLY; 1595 icmph->checksum = 0; 1596 icmph->checksum = ~NetCksum((uchar *)icmph, 1597 (len - IP_HDR_SIZE_NO_UDP) >> 1); 1598 (void) eth_send((uchar *)et, ETHER_HDR_SIZE + len); 1599 return; 1600 #endif 1601 default: 1602 return; 1603 } 1604 } else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */ 1605 return; 1606 } 1607 1608 #ifdef CONFIG_UDP_CHECKSUM 1609 if (ip->udp_xsum != 0) { 1610 ulong xsum; 1611 ushort *sumptr; 1612 ushort sumlen; 1613 1614 xsum = ip->ip_p; 1615 xsum += (ntohs(ip->udp_len)); 1616 xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff; 1617 xsum += (ntohl(ip->ip_src) >> 0) & 0x0000ffff; 1618 xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff; 1619 xsum += (ntohl(ip->ip_dst) >> 0) & 0x0000ffff; 1620 1621 sumlen = ntohs(ip->udp_len); 1622 sumptr = (ushort *) &(ip->udp_src); 1623 1624 while (sumlen > 1) { 1625 ushort sumdata; 1626 1627 sumdata = *sumptr++; 1628 xsum += ntohs(sumdata); 1629 sumlen -= 2; 1630 } 1631 if (sumlen > 0) { 1632 ushort sumdata; 1633 1634 sumdata = *(unsigned char *) sumptr; 1635 sumdata = (sumdata << 8) & 0xff00; 1636 xsum += sumdata; 1637 } 1638 while ((xsum >> 16) != 0) { 1639 xsum = (xsum & 0x0000ffff) + ((xsum >> 16) & 0x0000ffff); 1640 } 1641 if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) { 1642 printf(" UDP wrong checksum %08lx %08x\n", 1643 xsum, ntohs(ip->udp_xsum)); 1644 return; 1645 } 1646 } 1647 #endif 1648 1649 1650 #ifdef CONFIG_NETCONSOLE 1651 nc_input_packet((uchar *)ip +IP_HDR_SIZE, 1652 ntohs(ip->udp_dst), 1653 ntohs(ip->udp_src), 1654 ntohs(ip->udp_len) - 8); 1655 #endif 1656 /* 1657 * IP header OK. Pass the packet to the current handler. 1658 */ 1659 (*packetHandler)((uchar *)ip +IP_HDR_SIZE, 1660 ntohs(ip->udp_dst), 1661 ntohs(ip->udp_src), 1662 ntohs(ip->udp_len) - 8); 1663 break; 1664 } 1665 } 1666 1667 1668 /**********************************************************************/ 1669 1670 static int net_check_prereq (proto_t protocol) 1671 { 1672 switch (protocol) { 1673 /* Fall through */ 1674 #if defined(CONFIG_CMD_PING) 1675 case PING: 1676 if (NetPingIP == 0) { 1677 puts ("*** ERROR: ping address not given\n"); 1678 return (1); 1679 } 1680 goto common; 1681 #endif 1682 #if defined(CONFIG_CMD_SNTP) 1683 case SNTP: 1684 if (NetNtpServerIP == 0) { 1685 puts ("*** ERROR: NTP server address not given\n"); 1686 return (1); 1687 } 1688 goto common; 1689 #endif 1690 #if defined(CONFIG_CMD_DNS) 1691 case DNS: 1692 if (NetOurDNSIP == 0) { 1693 puts("*** ERROR: DNS server address not given\n"); 1694 return 1; 1695 } 1696 goto common; 1697 #endif 1698 #if defined(CONFIG_CMD_NFS) 1699 case NFS: 1700 #endif 1701 case NETCONS: 1702 case TFTP: 1703 if (NetServerIP == 0) { 1704 puts ("*** ERROR: `serverip' not set\n"); 1705 return (1); 1706 } 1707 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) 1708 common: 1709 #endif 1710 1711 if (NetOurIP == 0) { 1712 puts ("*** ERROR: `ipaddr' not set\n"); 1713 return (1); 1714 } 1715 /* Fall through */ 1716 1717 case DHCP: 1718 case RARP: 1719 case BOOTP: 1720 case CDP: 1721 if (memcmp (NetOurEther, "\0\0\0\0\0\0", 6) == 0) { 1722 #ifdef CONFIG_NET_MULTI 1723 extern int eth_get_dev_index (void); 1724 int num = eth_get_dev_index (); 1725 1726 switch (num) { 1727 case -1: 1728 puts ("*** ERROR: No ethernet found.\n"); 1729 return (1); 1730 case 0: 1731 puts ("*** ERROR: `ethaddr' not set\n"); 1732 break; 1733 default: 1734 printf ("*** ERROR: `eth%daddr' not set\n", 1735 num); 1736 break; 1737 } 1738 1739 NetStartAgain (); 1740 return (2); 1741 #else 1742 puts ("*** ERROR: `ethaddr' not set\n"); 1743 return (1); 1744 #endif 1745 } 1746 /* Fall through */ 1747 default: 1748 return (0); 1749 } 1750 return (0); /* OK */ 1751 } 1752 /**********************************************************************/ 1753 1754 int 1755 NetCksumOk(uchar * ptr, int len) 1756 { 1757 return !((NetCksum(ptr, len) + 1) & 0xfffe); 1758 } 1759 1760 1761 unsigned 1762 NetCksum(uchar * ptr, int len) 1763 { 1764 ulong xsum; 1765 ushort *p = (ushort *)ptr; 1766 1767 xsum = 0; 1768 while (len-- > 0) 1769 xsum += *p++; 1770 xsum = (xsum & 0xffff) + (xsum >> 16); 1771 xsum = (xsum & 0xffff) + (xsum >> 16); 1772 return (xsum & 0xffff); 1773 } 1774 1775 int 1776 NetEthHdrSize(void) 1777 { 1778 ushort myvlanid; 1779 1780 myvlanid = ntohs(NetOurVLAN); 1781 if (myvlanid == (ushort)-1) 1782 myvlanid = VLAN_NONE; 1783 1784 return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : VLAN_ETHER_HDR_SIZE; 1785 } 1786 1787 int 1788 NetSetEther(volatile uchar * xet, uchar * addr, uint prot) 1789 { 1790 Ethernet_t *et = (Ethernet_t *)xet; 1791 ushort myvlanid; 1792 1793 myvlanid = ntohs(NetOurVLAN); 1794 if (myvlanid == (ushort)-1) 1795 myvlanid = VLAN_NONE; 1796 1797 memcpy (et->et_dest, addr, 6); 1798 memcpy (et->et_src, NetOurEther, 6); 1799 if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) { 1800 et->et_protlen = htons(prot); 1801 return ETHER_HDR_SIZE; 1802 } else { 1803 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet; 1804 1805 vet->vet_vlan_type = htons(PROT_VLAN); 1806 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK)); 1807 vet->vet_type = htons(prot); 1808 return VLAN_ETHER_HDR_SIZE; 1809 } 1810 } 1811 1812 void 1813 NetSetIP(volatile uchar * xip, IPaddr_t dest, int dport, int sport, int len) 1814 { 1815 IP_t *ip = (IP_t *)xip; 1816 1817 /* 1818 * If the data is an odd number of bytes, zero the 1819 * byte after the last byte so that the checksum 1820 * will work. 1821 */ 1822 if (len & 1) 1823 xip[IP_HDR_SIZE + len] = 0; 1824 1825 /* 1826 * Construct an IP and UDP header. 1827 * (need to set no fragment bit - XXX) 1828 */ 1829 ip->ip_hl_v = 0x45; /* IP_HDR_SIZE / 4 (not including UDP) */ 1830 ip->ip_tos = 0; 1831 ip->ip_len = htons(IP_HDR_SIZE + len); 1832 ip->ip_id = htons(NetIPID++); 1833 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ 1834 ip->ip_ttl = 255; 1835 ip->ip_p = 17; /* UDP */ 1836 ip->ip_sum = 0; 1837 NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */ 1838 NetCopyIP((void*)&ip->ip_dst, &dest); /* - "" - */ 1839 ip->udp_src = htons(sport); 1840 ip->udp_dst = htons(dport); 1841 ip->udp_len = htons(8 + len); 1842 ip->udp_xsum = 0; 1843 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2); 1844 } 1845 1846 void copy_filename (char *dst, char *src, int size) 1847 { 1848 if (*src && (*src == '"')) { 1849 ++src; 1850 --size; 1851 } 1852 1853 while ((--size > 0) && *src && (*src != '"')) { 1854 *dst++ = *src++; 1855 } 1856 *dst = '\0'; 1857 } 1858 1859 #endif 1860 1861 #if defined(CONFIG_CMD_NFS) || defined(CONFIG_CMD_SNTP) || defined(CONFIG_CMD_DNS) 1862 /* 1863 * make port a little random, but use something trivial to compute 1864 */ 1865 unsigned int random_port(void) 1866 { 1867 return 1024 + (get_timer(0) % 0x8000);; 1868 } 1869 #endif 1870 1871 void ip_to_string (IPaddr_t x, char *s) 1872 { 1873 x = ntohl (x); 1874 sprintf (s, "%d.%d.%d.%d", 1875 (int) ((x >> 24) & 0xff), 1876 (int) ((x >> 16) & 0xff), 1877 (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff) 1878 ); 1879 } 1880 1881 IPaddr_t string_to_ip(char *s) 1882 { 1883 IPaddr_t addr; 1884 char *e; 1885 int i; 1886 1887 if (s == NULL) 1888 return(0); 1889 1890 for (addr=0, i=0; i<4; ++i) { 1891 ulong val = s ? simple_strtoul(s, &e, 10) : 0; 1892 addr <<= 8; 1893 addr |= (val & 0xFF); 1894 if (s) { 1895 s = (*e) ? e+1 : e; 1896 } 1897 } 1898 1899 return (htonl(addr)); 1900 } 1901 1902 void VLAN_to_string(ushort x, char *s) 1903 { 1904 x = ntohs(x); 1905 1906 if (x == (ushort)-1) 1907 x = VLAN_NONE; 1908 1909 if (x == VLAN_NONE) 1910 strcpy(s, "none"); 1911 else 1912 sprintf(s, "%d", x & VLAN_IDMASK); 1913 } 1914 1915 ushort string_to_VLAN(char *s) 1916 { 1917 ushort id; 1918 1919 if (s == NULL) 1920 return htons(VLAN_NONE); 1921 1922 if (*s < '0' || *s > '9') 1923 id = VLAN_NONE; 1924 else 1925 id = (ushort)simple_strtoul(s, NULL, 10); 1926 1927 return htons(id); 1928 } 1929 1930 IPaddr_t getenv_IPaddr (char *var) 1931 { 1932 return (string_to_ip(getenv(var))); 1933 } 1934 1935 ushort getenv_VLAN(char *var) 1936 { 1937 return (string_to_VLAN(getenv(var))); 1938 } 1939