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 static int NetTryCount; 201 202 /**********************************************************************/ 203 204 IPaddr_t NetArpWaitPacketIP; 205 IPaddr_t NetArpWaitReplyIP; 206 uchar *NetArpWaitPacketMAC; /* MAC address of waiting packet's destination */ 207 uchar *NetArpWaitTxPacket; /* THE transmit packet */ 208 int NetArpWaitTxPacketSize; 209 uchar NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN]; 210 ulong NetArpWaitTimerStart; 211 int NetArpWaitTry; 212 213 void ArpRequest (void) 214 { 215 int i; 216 volatile uchar *pkt; 217 ARP_t *arp; 218 219 debug("ARP broadcast %d\n", NetArpWaitTry); 220 221 pkt = NetTxPacket; 222 223 pkt += NetSetEther (pkt, NetBcastAddr, PROT_ARP); 224 225 arp = (ARP_t *) pkt; 226 227 arp->ar_hrd = htons (ARP_ETHER); 228 arp->ar_pro = htons (PROT_IP); 229 arp->ar_hln = 6; 230 arp->ar_pln = 4; 231 arp->ar_op = htons (ARPOP_REQUEST); 232 233 memcpy (&arp->ar_data[0], NetOurEther, 6); /* source ET addr */ 234 NetWriteIP ((uchar *) & arp->ar_data[6], NetOurIP); /* source IP addr */ 235 for (i = 10; i < 16; ++i) { 236 arp->ar_data[i] = 0; /* dest ET addr = 0 */ 237 } 238 239 if ((NetArpWaitPacketIP & NetOurSubnetMask) != 240 (NetOurIP & NetOurSubnetMask)) { 241 if (NetOurGatewayIP == 0) { 242 puts ("## Warning: gatewayip needed but not set\n"); 243 NetArpWaitReplyIP = NetArpWaitPacketIP; 244 } else { 245 NetArpWaitReplyIP = NetOurGatewayIP; 246 } 247 } else { 248 NetArpWaitReplyIP = NetArpWaitPacketIP; 249 } 250 251 NetWriteIP ((uchar *) & arp->ar_data[16], NetArpWaitReplyIP); 252 (void) eth_send (NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE); 253 } 254 255 void ArpTimeoutCheck(void) 256 { 257 ulong t; 258 259 if (!NetArpWaitPacketIP) 260 return; 261 262 t = get_timer(0); 263 264 /* check for arp timeout */ 265 if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT) { 266 NetArpWaitTry++; 267 268 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) { 269 puts ("\nARP Retry count exceeded; starting again\n"); 270 NetArpWaitTry = 0; 271 NetStartAgain(); 272 } else { 273 NetArpWaitTimerStart = t; 274 ArpRequest(); 275 } 276 } 277 } 278 279 static void 280 NetInitLoop(proto_t protocol) 281 { 282 static int env_changed_id = 0; 283 bd_t *bd = gd->bd; 284 int env_id = get_env_id (); 285 286 /* update only when the environment has changed */ 287 if (env_changed_id != env_id) { 288 NetCopyIP(&NetOurIP, &bd->bi_ip_addr); 289 NetOurGatewayIP = getenv_IPaddr ("gatewayip"); 290 NetOurSubnetMask= getenv_IPaddr ("netmask"); 291 NetServerIP = getenv_IPaddr ("serverip"); 292 NetOurNativeVLAN = getenv_VLAN("nvlan"); 293 NetOurVLAN = getenv_VLAN("vlan"); 294 #if defined(CONFIG_CMD_DNS) 295 NetOurDNSIP = getenv_IPaddr("dnsip"); 296 #endif 297 env_changed_id = env_id; 298 } 299 300 return; 301 } 302 303 /**********************************************************************/ 304 /* 305 * Main network processing loop. 306 */ 307 308 int 309 NetLoop(proto_t protocol) 310 { 311 bd_t *bd = gd->bd; 312 313 #ifdef CONFIG_NET_MULTI 314 NetRestarted = 0; 315 NetDevExists = 0; 316 #endif 317 318 /* XXX problem with bss workaround */ 319 NetArpWaitPacketMAC = NULL; 320 NetArpWaitTxPacket = NULL; 321 NetArpWaitPacketIP = 0; 322 NetArpWaitReplyIP = 0; 323 NetArpWaitTxPacket = NULL; 324 NetTxPacket = NULL; 325 NetTryCount = 1; 326 327 if (!NetTxPacket) { 328 int i; 329 /* 330 * Setup packet buffers, aligned correctly. 331 */ 332 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1); 333 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN; 334 for (i = 0; i < PKTBUFSRX; i++) { 335 NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN; 336 } 337 } 338 339 if (!NetArpWaitTxPacket) { 340 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1); 341 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN; 342 NetArpWaitTxPacketSize = 0; 343 } 344 345 eth_halt(); 346 #ifdef CONFIG_NET_MULTI 347 eth_set_current(); 348 #endif 349 if (eth_init(bd) < 0) { 350 eth_halt(); 351 return(-1); 352 } 353 354 restart: 355 #ifdef CONFIG_NET_MULTI 356 memcpy (NetOurEther, eth_get_dev()->enetaddr, 6); 357 #else 358 eth_getenv_enetaddr("ethaddr", NetOurEther); 359 #endif 360 361 NetState = NETLOOP_CONTINUE; 362 363 /* 364 * Start the ball rolling with the given start function. From 365 * here on, this code is a state machine driven by received 366 * packets and timer events. 367 */ 368 NetInitLoop(protocol); 369 370 switch (net_check_prereq (protocol)) { 371 case 1: 372 /* network not configured */ 373 eth_halt(); 374 return (-1); 375 376 #ifdef CONFIG_NET_MULTI 377 case 2: 378 /* network device not configured */ 379 break; 380 #endif /* CONFIG_NET_MULTI */ 381 382 case 0: 383 #ifdef CONFIG_NET_MULTI 384 NetDevExists = 1; 385 #endif 386 switch (protocol) { 387 case TFTP: 388 /* always use ARP to get server ethernet address */ 389 TftpStart(); 390 break; 391 392 #if defined(CONFIG_CMD_DHCP) 393 case DHCP: 394 BootpTry = 0; 395 NetOurIP = 0; 396 DhcpRequest(); /* Basically same as BOOTP */ 397 break; 398 #endif 399 400 case BOOTP: 401 BootpTry = 0; 402 NetOurIP = 0; 403 BootpRequest (); 404 break; 405 406 case RARP: 407 RarpTry = 0; 408 NetOurIP = 0; 409 RarpRequest (); 410 break; 411 #if defined(CONFIG_CMD_PING) 412 case PING: 413 PingStart(); 414 break; 415 #endif 416 #if defined(CONFIG_CMD_NFS) 417 case NFS: 418 NfsStart(); 419 break; 420 #endif 421 #if defined(CONFIG_CMD_CDP) 422 case CDP: 423 CDPStart(); 424 break; 425 #endif 426 #ifdef CONFIG_NETCONSOLE 427 case NETCONS: 428 NcStart(); 429 break; 430 #endif 431 #if defined(CONFIG_CMD_SNTP) 432 case SNTP: 433 SntpStart(); 434 break; 435 #endif 436 #if defined(CONFIG_CMD_DNS) 437 case DNS: 438 DnsStart(); 439 break; 440 #endif 441 default: 442 break; 443 } 444 445 NetBootFileXferSize = 0; 446 break; 447 } 448 449 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 450 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && defined(CONFIG_STATUS_LED) && defined(STATUS_LED_RED) 451 /* 452 * Echo the inverted link state to the fault LED. 453 */ 454 if(miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) { 455 status_led_set (STATUS_LED_RED, STATUS_LED_OFF); 456 } else { 457 status_led_set (STATUS_LED_RED, STATUS_LED_ON); 458 } 459 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 460 #endif /* CONFIG_MII, ... */ 461 462 /* 463 * Main packet reception loop. Loop receiving packets until 464 * someone sets `NetState' to a state that terminates. 465 */ 466 for (;;) { 467 WATCHDOG_RESET(); 468 #ifdef CONFIG_SHOW_ACTIVITY 469 { 470 extern void show_activity(int arg); 471 show_activity(1); 472 } 473 #endif 474 /* 475 * Check the ethernet for a new packet. The ethernet 476 * receive routine will process it. 477 */ 478 eth_rx(); 479 480 /* 481 * Abort if ctrl-c was pressed. 482 */ 483 if (ctrlc()) { 484 eth_halt(); 485 puts ("\nAbort\n"); 486 return (-1); 487 } 488 489 ArpTimeoutCheck(); 490 491 /* 492 * Check for a timeout, and run the timeout handler 493 * if we have one. 494 */ 495 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) { 496 thand_f *x; 497 498 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 499 # if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ 500 defined(CONFIG_STATUS_LED) && \ 501 defined(STATUS_LED_RED) 502 /* 503 * Echo the inverted link state to the fault LED. 504 */ 505 if(miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) { 506 status_led_set (STATUS_LED_RED, STATUS_LED_OFF); 507 } else { 508 status_led_set (STATUS_LED_RED, STATUS_LED_ON); 509 } 510 # endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 511 #endif /* CONFIG_MII, ... */ 512 x = timeHandler; 513 timeHandler = (thand_f *)0; 514 (*x)(); 515 } 516 517 518 switch (NetState) { 519 520 case NETLOOP_RESTART: 521 #ifdef CONFIG_NET_MULTI 522 NetRestarted = 1; 523 #endif 524 goto restart; 525 526 case NETLOOP_SUCCESS: 527 if (NetBootFileXferSize > 0) { 528 char buf[20]; 529 printf("Bytes transferred = %ld (%lx hex)\n", 530 NetBootFileXferSize, 531 NetBootFileXferSize); 532 sprintf(buf, "%lX", NetBootFileXferSize); 533 setenv("filesize", buf); 534 535 sprintf(buf, "%lX", (unsigned long)load_addr); 536 setenv("fileaddr", buf); 537 } 538 eth_halt(); 539 return NetBootFileXferSize; 540 541 case NETLOOP_FAIL: 542 return (-1); 543 } 544 } 545 } 546 547 /**********************************************************************/ 548 549 static void 550 startAgainTimeout(void) 551 { 552 NetState = NETLOOP_RESTART; 553 } 554 555 static void 556 startAgainHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len) 557 { 558 /* Totally ignore the packet */ 559 } 560 561 void NetStartAgain (void) 562 { 563 char *nretry; 564 int retry_forever = 0; 565 unsigned long retrycnt = 0; 566 567 nretry = getenv("netretry"); 568 if (nretry) { 569 if (!strcmp(nretry, "yes")) 570 retry_forever = 1; 571 else if (!strcmp(nretry, "no")) 572 retrycnt = 0; 573 else if (!strcmp(nretry, "once")) 574 retrycnt = 1; 575 else 576 retrycnt = simple_strtoul(nretry, NULL, 0); 577 } else 578 retry_forever = 1; 579 580 if ((!retry_forever) && (NetTryCount >= retrycnt)) { 581 eth_halt(); 582 NetState = NETLOOP_FAIL; 583 return; 584 } 585 586 NetTryCount++; 587 588 #ifndef CONFIG_NET_MULTI 589 NetSetTimeout (10000UL, startAgainTimeout); 590 NetSetHandler (startAgainHandler); 591 #else /* !CONFIG_NET_MULTI*/ 592 eth_halt (); 593 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER) 594 eth_try_another (!NetRestarted); 595 #endif 596 eth_init (gd->bd); 597 if (NetRestartWrap) { 598 NetRestartWrap = 0; 599 if (NetDevExists) { 600 NetSetTimeout (10000UL, startAgainTimeout); 601 NetSetHandler (startAgainHandler); 602 } else { 603 NetState = NETLOOP_FAIL; 604 } 605 } else { 606 NetState = NETLOOP_RESTART; 607 } 608 #endif /* CONFIG_NET_MULTI */ 609 } 610 611 /**********************************************************************/ 612 /* 613 * Miscelaneous bits. 614 */ 615 616 void 617 NetSetHandler(rxhand_f * f) 618 { 619 packetHandler = f; 620 } 621 622 623 void 624 NetSetTimeout(ulong iv, thand_f * f) 625 { 626 if (iv == 0) { 627 timeHandler = (thand_f *)0; 628 } else { 629 timeHandler = f; 630 timeStart = get_timer(0); 631 timeDelta = iv; 632 } 633 } 634 635 636 void 637 NetSendPacket(volatile uchar * pkt, int len) 638 { 639 (void) eth_send(pkt, len); 640 } 641 642 int 643 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len) 644 { 645 uchar *pkt; 646 647 /* convert to new style broadcast */ 648 if (dest == 0) 649 dest = 0xFFFFFFFF; 650 651 /* if broadcast, make the ether address a broadcast and don't do ARP */ 652 if (dest == 0xFFFFFFFF) 653 ether = NetBcastAddr; 654 655 /* if MAC address was not discovered yet, save the packet and do an ARP request */ 656 if (memcmp(ether, NetEtherNullAddr, 6) == 0) { 657 658 debug("sending ARP for %08lx\n", dest); 659 660 NetArpWaitPacketIP = dest; 661 NetArpWaitPacketMAC = ether; 662 663 pkt = NetArpWaitTxPacket; 664 pkt += NetSetEther (pkt, NetArpWaitPacketMAC, PROT_IP); 665 666 NetSetIP (pkt, dest, dport, sport, len); 667 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len); 668 669 /* size of the waiting packet */ 670 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE + len; 671 672 /* and do the ARP request */ 673 NetArpWaitTry = 1; 674 NetArpWaitTimerStart = get_timer(0); 675 ArpRequest(); 676 return 1; /* waiting */ 677 } 678 679 debug("sending UDP to %08lx/%pM\n", dest, ether); 680 681 pkt = (uchar *)NetTxPacket; 682 pkt += NetSetEther (pkt, ether, PROT_IP); 683 NetSetIP (pkt, dest, dport, sport, len); 684 (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len); 685 686 return 0; /* transmitted */ 687 } 688 689 #if defined(CONFIG_CMD_PING) 690 static ushort PingSeqNo; 691 692 int PingSend(void) 693 { 694 static uchar mac[6]; 695 volatile IP_t *ip; 696 volatile ushort *s; 697 uchar *pkt; 698 699 /* XXX always send arp request */ 700 701 memcpy(mac, NetEtherNullAddr, 6); 702 703 debug("sending ARP for %08lx\n", NetPingIP); 704 705 NetArpWaitPacketIP = NetPingIP; 706 NetArpWaitPacketMAC = mac; 707 708 pkt = NetArpWaitTxPacket; 709 pkt += NetSetEther(pkt, mac, PROT_IP); 710 711 ip = (volatile IP_t *)pkt; 712 713 /* 714 * Construct an IP and ICMP header. (need to set no fragment bit - XXX) 715 */ 716 ip->ip_hl_v = 0x45; /* IP_HDR_SIZE / 4 (not including UDP) */ 717 ip->ip_tos = 0; 718 ip->ip_len = htons(IP_HDR_SIZE_NO_UDP + 8); 719 ip->ip_id = htons(NetIPID++); 720 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ 721 ip->ip_ttl = 255; 722 ip->ip_p = 0x01; /* ICMP */ 723 ip->ip_sum = 0; 724 NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */ 725 NetCopyIP((void*)&ip->ip_dst, &NetPingIP); /* - "" - */ 726 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2); 727 728 s = &ip->udp_src; /* XXX ICMP starts here */ 729 s[0] = htons(0x0800); /* echo-request, code */ 730 s[1] = 0; /* checksum */ 731 s[2] = 0; /* identifier */ 732 s[3] = htons(PingSeqNo++); /* sequence number */ 733 s[1] = ~NetCksum((uchar *)s, 8/2); 734 735 /* size of the waiting packet */ 736 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8; 737 738 /* and do the ARP request */ 739 NetArpWaitTry = 1; 740 NetArpWaitTimerStart = get_timer(0); 741 ArpRequest(); 742 return 1; /* waiting */ 743 } 744 745 static void 746 PingTimeout (void) 747 { 748 eth_halt(); 749 NetState = NETLOOP_FAIL; /* we did not get the reply */ 750 } 751 752 static void 753 PingHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len) 754 { 755 IPaddr_t tmp; 756 volatile IP_t *ip = (volatile IP_t *)pkt; 757 758 tmp = NetReadIP((void *)&ip->ip_src); 759 if (tmp != NetPingIP) 760 return; 761 762 NetState = NETLOOP_SUCCESS; 763 } 764 765 static void PingStart(void) 766 { 767 #if defined(CONFIG_NET_MULTI) 768 printf ("Using %s device\n", eth_get_name()); 769 #endif /* CONFIG_NET_MULTI */ 770 NetSetTimeout (10000UL, PingTimeout); 771 NetSetHandler (PingHandler); 772 773 PingSend(); 774 } 775 #endif 776 777 #if defined(CONFIG_CMD_CDP) 778 779 #define CDP_DEVICE_ID_TLV 0x0001 780 #define CDP_ADDRESS_TLV 0x0002 781 #define CDP_PORT_ID_TLV 0x0003 782 #define CDP_CAPABILITIES_TLV 0x0004 783 #define CDP_VERSION_TLV 0x0005 784 #define CDP_PLATFORM_TLV 0x0006 785 #define CDP_NATIVE_VLAN_TLV 0x000a 786 #define CDP_APPLIANCE_VLAN_TLV 0x000e 787 #define CDP_TRIGGER_TLV 0x000f 788 #define CDP_POWER_CONSUMPTION_TLV 0x0010 789 #define CDP_SYSNAME_TLV 0x0014 790 #define CDP_SYSOBJECT_TLV 0x0015 791 #define CDP_MANAGEMENT_ADDRESS_TLV 0x0016 792 793 #define CDP_TIMEOUT 250UL /* one packet every 250ms */ 794 795 static int CDPSeq; 796 static int CDPOK; 797 798 ushort CDPNativeVLAN; 799 ushort CDPApplianceVLAN; 800 801 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 0x00 }; 802 803 static ushort CDP_compute_csum(const uchar *buff, ushort len) 804 { 805 ushort csum; 806 int odd; 807 ulong result = 0; 808 ushort leftover; 809 ushort *p; 810 811 if (len > 0) { 812 odd = 1 & (ulong)buff; 813 if (odd) { 814 result = *buff << 8; 815 len--; 816 buff++; 817 } 818 while (len > 1) { 819 p = (ushort *)buff; 820 result += *p++; 821 buff = (uchar *)p; 822 if (result & 0x80000000) 823 result = (result & 0xFFFF) + (result >> 16); 824 len -= 2; 825 } 826 if (len) { 827 leftover = (signed short)(*(const signed char *)buff); 828 /* CISCO SUCKS big time! (and blows too): 829 * CDP uses the IP checksum algorithm with a twist; 830 * for the last byte it *sign* extends and sums. 831 */ 832 result = (result & 0xffff0000) | ((result + leftover) & 0x0000ffff); 833 } 834 while (result >> 16) 835 result = (result & 0xFFFF) + (result >> 16); 836 837 if (odd) 838 result = ((result >> 8) & 0xff) | ((result & 0xff) << 8); 839 } 840 841 /* add up 16-bit and 17-bit words for 17+c bits */ 842 result = (result & 0xffff) + (result >> 16); 843 /* add up 16-bit and 2-bit for 16+c bit */ 844 result = (result & 0xffff) + (result >> 16); 845 /* add up carry.. */ 846 result = (result & 0xffff) + (result >> 16); 847 848 /* negate */ 849 csum = ~(ushort)result; 850 851 /* run time endian detection */ 852 if (csum != htons(csum)) /* little endian */ 853 csum = htons(csum); 854 855 return csum; 856 } 857 858 int CDPSendTrigger(void) 859 { 860 volatile uchar *pkt; 861 volatile ushort *s; 862 volatile ushort *cp; 863 Ethernet_t *et; 864 int len; 865 ushort chksum; 866 #if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID) || \ 867 defined(CONFIG_CDP_VERSION) || defined(CONFIG_CDP_PLATFORM) 868 char buf[32]; 869 #endif 870 871 pkt = NetTxPacket; 872 et = (Ethernet_t *)pkt; 873 874 /* NOTE: trigger sent not on any VLAN */ 875 876 /* form ethernet header */ 877 memcpy(et->et_dest, NetCDPAddr, 6); 878 memcpy(et->et_src, NetOurEther, 6); 879 880 pkt += ETHER_HDR_SIZE; 881 882 /* SNAP header */ 883 memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)); 884 pkt += sizeof(CDP_SNAP_hdr); 885 886 /* CDP header */ 887 *pkt++ = 0x02; /* CDP version 2 */ 888 *pkt++ = 180; /* TTL */ 889 s = (volatile ushort *)pkt; 890 cp = s; 891 *s++ = htons(0); /* checksum (0 for later calculation) */ 892 893 /* CDP fields */ 894 #ifdef CONFIG_CDP_DEVICE_ID 895 *s++ = htons(CDP_DEVICE_ID_TLV); 896 *s++ = htons(CONFIG_CDP_DEVICE_ID); 897 sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%pm", NetOurEther); 898 memcpy((uchar *)s, buf, 16); 899 s += 16 / 2; 900 #endif 901 902 #ifdef CONFIG_CDP_PORT_ID 903 *s++ = htons(CDP_PORT_ID_TLV); 904 memset(buf, 0, sizeof(buf)); 905 sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index()); 906 len = strlen(buf); 907 if (len & 1) /* make it even */ 908 len++; 909 *s++ = htons(len + 4); 910 memcpy((uchar *)s, buf, len); 911 s += len / 2; 912 #endif 913 914 #ifdef CONFIG_CDP_CAPABILITIES 915 *s++ = htons(CDP_CAPABILITIES_TLV); 916 *s++ = htons(8); 917 *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES); 918 s += 2; 919 #endif 920 921 #ifdef CONFIG_CDP_VERSION 922 *s++ = htons(CDP_VERSION_TLV); 923 memset(buf, 0, sizeof(buf)); 924 strcpy(buf, CONFIG_CDP_VERSION); 925 len = strlen(buf); 926 if (len & 1) /* make it even */ 927 len++; 928 *s++ = htons(len + 4); 929 memcpy((uchar *)s, buf, len); 930 s += len / 2; 931 #endif 932 933 #ifdef CONFIG_CDP_PLATFORM 934 *s++ = htons(CDP_PLATFORM_TLV); 935 memset(buf, 0, sizeof(buf)); 936 strcpy(buf, CONFIG_CDP_PLATFORM); 937 len = strlen(buf); 938 if (len & 1) /* make it even */ 939 len++; 940 *s++ = htons(len + 4); 941 memcpy((uchar *)s, buf, len); 942 s += len / 2; 943 #endif 944 945 #ifdef CONFIG_CDP_TRIGGER 946 *s++ = htons(CDP_TRIGGER_TLV); 947 *s++ = htons(8); 948 *(ulong *)s = htonl(CONFIG_CDP_TRIGGER); 949 s += 2; 950 #endif 951 952 #ifdef CONFIG_CDP_POWER_CONSUMPTION 953 *s++ = htons(CDP_POWER_CONSUMPTION_TLV); 954 *s++ = htons(6); 955 *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION); 956 #endif 957 958 /* length of ethernet packet */ 959 len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE); 960 et->et_protlen = htons(len); 961 962 len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr); 963 chksum = CDP_compute_csum((uchar *)NetTxPacket + len, (uchar *)s - (NetTxPacket + len)); 964 if (chksum == 0) 965 chksum = 0xFFFF; 966 *cp = htons(chksum); 967 968 (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket); 969 return 0; 970 } 971 972 static void 973 CDPTimeout (void) 974 { 975 CDPSeq++; 976 977 if (CDPSeq < 3) { 978 NetSetTimeout (CDP_TIMEOUT, CDPTimeout); 979 CDPSendTrigger(); 980 return; 981 } 982 983 /* if not OK try again */ 984 if (!CDPOK) 985 NetStartAgain(); 986 else 987 NetState = NETLOOP_SUCCESS; 988 } 989 990 static void 991 CDPDummyHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len) 992 { 993 /* nothing */ 994 } 995 996 static void 997 CDPHandler(const uchar * pkt, unsigned len) 998 { 999 const uchar *t; 1000 const ushort *ss; 1001 ushort type, tlen; 1002 uchar applid; 1003 ushort vlan, nvlan; 1004 1005 /* minimum size? */ 1006 if (len < sizeof(CDP_SNAP_hdr) + 4) 1007 goto pkt_short; 1008 1009 /* check for valid CDP SNAP header */ 1010 if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0) 1011 return; 1012 1013 pkt += sizeof(CDP_SNAP_hdr); 1014 len -= sizeof(CDP_SNAP_hdr); 1015 1016 /* Version of CDP protocol must be >= 2 and TTL != 0 */ 1017 if (pkt[0] < 0x02 || pkt[1] == 0) 1018 return; 1019 1020 /* if version is greater than 0x02 maybe we'll have a problem; output a warning */ 1021 if (pkt[0] != 0x02) 1022 printf("** WARNING: CDP packet received with a protocol version %d > 2\n", 1023 pkt[0] & 0xff); 1024 1025 if (CDP_compute_csum(pkt, len) != 0) 1026 return; 1027 1028 pkt += 4; 1029 len -= 4; 1030 1031 vlan = htons(-1); 1032 nvlan = htons(-1); 1033 while (len > 0) { 1034 if (len < 4) 1035 goto pkt_short; 1036 1037 ss = (const ushort *)pkt; 1038 type = ntohs(ss[0]); 1039 tlen = ntohs(ss[1]); 1040 if (tlen > len) { 1041 goto pkt_short; 1042 } 1043 1044 pkt += tlen; 1045 len -= tlen; 1046 1047 ss += 2; /* point ss to the data of the TLV */ 1048 tlen -= 4; 1049 1050 switch (type) { 1051 case CDP_DEVICE_ID_TLV: 1052 break; 1053 case CDP_ADDRESS_TLV: 1054 break; 1055 case CDP_PORT_ID_TLV: 1056 break; 1057 case CDP_CAPABILITIES_TLV: 1058 break; 1059 case CDP_VERSION_TLV: 1060 break; 1061 case CDP_PLATFORM_TLV: 1062 break; 1063 case CDP_NATIVE_VLAN_TLV: 1064 nvlan = *ss; 1065 break; 1066 case CDP_APPLIANCE_VLAN_TLV: 1067 t = (const uchar *)ss; 1068 while (tlen > 0) { 1069 if (tlen < 3) 1070 goto pkt_short; 1071 1072 applid = t[0]; 1073 ss = (const ushort *)(t + 1); 1074 1075 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE 1076 if (applid == CONFIG_CDP_APPLIANCE_VLAN_TYPE) 1077 vlan = *ss; 1078 #else 1079 vlan = ntohs(*ss); /* XXX will this work; dunno */ 1080 #endif 1081 t += 3; tlen -= 3; 1082 } 1083 break; 1084 case CDP_TRIGGER_TLV: 1085 break; 1086 case CDP_POWER_CONSUMPTION_TLV: 1087 break; 1088 case CDP_SYSNAME_TLV: 1089 break; 1090 case CDP_SYSOBJECT_TLV: 1091 break; 1092 case CDP_MANAGEMENT_ADDRESS_TLV: 1093 break; 1094 } 1095 } 1096 1097 CDPApplianceVLAN = vlan; 1098 CDPNativeVLAN = nvlan; 1099 1100 CDPOK = 1; 1101 return; 1102 1103 pkt_short: 1104 printf("** CDP packet is too short\n"); 1105 return; 1106 } 1107 1108 static void CDPStart(void) 1109 { 1110 #if defined(CONFIG_NET_MULTI) 1111 printf ("Using %s device\n", eth_get_name()); 1112 #endif 1113 CDPSeq = 0; 1114 CDPOK = 0; 1115 1116 CDPNativeVLAN = htons(-1); 1117 CDPApplianceVLAN = htons(-1); 1118 1119 NetSetTimeout (CDP_TIMEOUT, CDPTimeout); 1120 NetSetHandler (CDPDummyHandler); 1121 1122 CDPSendTrigger(); 1123 } 1124 #endif 1125 1126 #ifdef CONFIG_IP_DEFRAG 1127 /* 1128 * This function collects fragments in a single packet, according 1129 * to the algorithm in RFC815. It returns NULL or the pointer to 1130 * a complete packet, in static storage 1131 */ 1132 #ifndef CONFIG_NET_MAXDEFRAG 1133 #define CONFIG_NET_MAXDEFRAG 16384 1134 #endif 1135 /* 1136 * MAXDEFRAG, above, is chosen in the config file and is real data 1137 * so we need to add the NFS overhead, which is more than TFTP. 1138 * To use sizeof in the internal unnamed structures, we need a real 1139 * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately). 1140 * The compiler doesn't complain nor allocates the actual structure 1141 */ 1142 static struct rpc_t rpc_specimen; 1143 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply)) 1144 1145 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE_NO_UDP) 1146 1147 /* 1148 * this is the packet being assembled, either data or frag control. 1149 * Fragments go by 8 bytes, so this union must be 8 bytes long 1150 */ 1151 struct hole { 1152 /* first_byte is address of this structure */ 1153 u16 last_byte; /* last byte in this hole + 1 (begin of next hole) */ 1154 u16 next_hole; /* index of next (in 8-b blocks), 0 == none */ 1155 u16 prev_hole; /* index of prev, 0 == none */ 1156 u16 unused; 1157 }; 1158 1159 static IP_t *__NetDefragment(IP_t *ip, int *lenp) 1160 { 1161 static uchar pkt_buff[IP_PKTSIZE] __attribute__((aligned(PKTALIGN))); 1162 static u16 first_hole, total_len; 1163 struct hole *payload, *thisfrag, *h, *newh; 1164 IP_t *localip = (IP_t *)pkt_buff; 1165 uchar *indata = (uchar *)ip; 1166 int offset8, start, len, done = 0; 1167 u16 ip_off = ntohs(ip->ip_off); 1168 1169 /* payload starts after IP header, this fragment is in there */ 1170 payload = (struct hole *)(pkt_buff + IP_HDR_SIZE_NO_UDP); 1171 offset8 = (ip_off & IP_OFFS); 1172 thisfrag = payload + offset8; 1173 start = offset8 * 8; 1174 len = ntohs(ip->ip_len) - IP_HDR_SIZE_NO_UDP; 1175 1176 if (start + len > IP_MAXUDP) /* fragment extends too far */ 1177 return NULL; 1178 1179 if (!total_len || localip->ip_id != ip->ip_id) { 1180 /* new (or different) packet, reset structs */ 1181 total_len = 0xffff; 1182 payload[0].last_byte = ~0; 1183 payload[0].next_hole = 0; 1184 payload[0].prev_hole = 0; 1185 first_hole = 0; 1186 /* any IP header will work, copy the first we received */ 1187 memcpy(localip, ip, IP_HDR_SIZE_NO_UDP); 1188 } 1189 1190 /* 1191 * What follows is the reassembly algorithm. We use the payload 1192 * array as a linked list of hole descriptors, as each hole starts 1193 * at a multiple of 8 bytes. However, last byte can be whatever value, 1194 * so it is represented as byte count, not as 8-byte blocks. 1195 */ 1196 1197 h = payload + first_hole; 1198 while (h->last_byte < start) { 1199 if (!h->next_hole) { 1200 /* no hole that far away */ 1201 return NULL; 1202 } 1203 h = payload + h->next_hole; 1204 } 1205 1206 if (offset8 + (len / 8) <= h - payload) { 1207 /* no overlap with holes (dup fragment?) */ 1208 return NULL; 1209 } 1210 1211 if (!(ip_off & IP_FLAGS_MFRAG)) { 1212 /* no more fragmentss: truncate this (last) hole */ 1213 total_len = start + len; 1214 h->last_byte = start + len; 1215 } 1216 1217 /* 1218 * There is some overlap: fix the hole list. This code doesn't 1219 * deal with a fragment that overlaps with two different holes 1220 * (thus being a superset of a previously-received fragment). 1221 */ 1222 1223 if ( (h >= thisfrag) && (h->last_byte <= start + len) ) { 1224 /* complete overlap with hole: remove hole */ 1225 if (!h->prev_hole && !h->next_hole) { 1226 /* last remaining hole */ 1227 done = 1; 1228 } else if (!h->prev_hole) { 1229 /* first hole */ 1230 first_hole = h->next_hole; 1231 payload[h->next_hole].prev_hole = 0; 1232 } else if (!h->next_hole) { 1233 /* last hole */ 1234 payload[h->prev_hole].next_hole = 0; 1235 } else { 1236 /* in the middle of the list */ 1237 payload[h->next_hole].prev_hole = h->prev_hole; 1238 payload[h->prev_hole].next_hole = h->next_hole; 1239 } 1240 1241 } else if (h->last_byte <= start + len) { 1242 /* overlaps with final part of the hole: shorten this hole */ 1243 h->last_byte = start; 1244 1245 } else if (h >= thisfrag) { 1246 /* overlaps with initial part of the hole: move this hole */ 1247 newh = thisfrag + (len / 8); 1248 *newh = *h; 1249 h = newh; 1250 if (h->next_hole) 1251 payload[h->next_hole].prev_hole = (h - payload); 1252 if (h->prev_hole) 1253 payload[h->prev_hole].next_hole = (h - payload); 1254 else 1255 first_hole = (h - payload); 1256 1257 } else { 1258 /* fragment sits in the middle: split the hole */ 1259 newh = thisfrag + (len / 8); 1260 *newh = *h; 1261 h->last_byte = start; 1262 h->next_hole = (newh - payload); 1263 newh->prev_hole = (h - payload); 1264 if (newh->next_hole) 1265 payload[newh->next_hole].prev_hole = (newh - payload); 1266 } 1267 1268 /* finally copy this fragment and possibly return whole packet */ 1269 memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE_NO_UDP, len); 1270 if (!done) 1271 return NULL; 1272 1273 localip->ip_len = htons(total_len); 1274 *lenp = total_len + IP_HDR_SIZE_NO_UDP; 1275 return localip; 1276 } 1277 1278 static inline IP_t *NetDefragment(IP_t *ip, int *lenp) 1279 { 1280 u16 ip_off = ntohs(ip->ip_off); 1281 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) 1282 return ip; /* not a fragment */ 1283 return __NetDefragment(ip, lenp); 1284 } 1285 1286 #else /* !CONFIG_IP_DEFRAG */ 1287 1288 static inline IP_t *NetDefragment(IP_t *ip, int *lenp) 1289 { 1290 u16 ip_off = ntohs(ip->ip_off); 1291 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) 1292 return ip; /* not a fragment */ 1293 return NULL; 1294 } 1295 #endif 1296 1297 void 1298 NetReceive(volatile uchar * inpkt, int len) 1299 { 1300 Ethernet_t *et; 1301 IP_t *ip; 1302 ARP_t *arp; 1303 IPaddr_t tmp; 1304 int x; 1305 uchar *pkt; 1306 #if defined(CONFIG_CMD_CDP) 1307 int iscdp; 1308 #endif 1309 ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid; 1310 1311 debug("packet received\n"); 1312 1313 NetRxPacket = inpkt; 1314 NetRxPacketLen = len; 1315 et = (Ethernet_t *)inpkt; 1316 1317 /* too small packet? */ 1318 if (len < ETHER_HDR_SIZE) 1319 return; 1320 1321 #ifdef CONFIG_API 1322 if (push_packet) { 1323 (*push_packet)(inpkt, len); 1324 return; 1325 } 1326 #endif 1327 1328 #if defined(CONFIG_CMD_CDP) 1329 /* keep track if packet is CDP */ 1330 iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0; 1331 #endif 1332 1333 myvlanid = ntohs(NetOurVLAN); 1334 if (myvlanid == (ushort)-1) 1335 myvlanid = VLAN_NONE; 1336 mynvlanid = ntohs(NetOurNativeVLAN); 1337 if (mynvlanid == (ushort)-1) 1338 mynvlanid = VLAN_NONE; 1339 1340 x = ntohs(et->et_protlen); 1341 1342 debug("packet received\n"); 1343 1344 if (x < 1514) { 1345 /* 1346 * Got a 802 packet. Check the other protocol field. 1347 */ 1348 x = ntohs(et->et_prot); 1349 1350 ip = (IP_t *)(inpkt + E802_HDR_SIZE); 1351 len -= E802_HDR_SIZE; 1352 1353 } else if (x != PROT_VLAN) { /* normal packet */ 1354 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE); 1355 len -= ETHER_HDR_SIZE; 1356 1357 } else { /* VLAN packet */ 1358 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et; 1359 1360 debug("VLAN packet received\n"); 1361 1362 /* too small packet? */ 1363 if (len < VLAN_ETHER_HDR_SIZE) 1364 return; 1365 1366 /* if no VLAN active */ 1367 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE 1368 #if defined(CONFIG_CMD_CDP) 1369 && iscdp == 0 1370 #endif 1371 ) 1372 return; 1373 1374 cti = ntohs(vet->vet_tag); 1375 vlanid = cti & VLAN_IDMASK; 1376 x = ntohs(vet->vet_type); 1377 1378 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE); 1379 len -= VLAN_ETHER_HDR_SIZE; 1380 } 1381 1382 debug("Receive from protocol 0x%x\n", x); 1383 1384 #if defined(CONFIG_CMD_CDP) 1385 if (iscdp) { 1386 CDPHandler((uchar *)ip, len); 1387 return; 1388 } 1389 #endif 1390 1391 if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) { 1392 if (vlanid == VLAN_NONE) 1393 vlanid = (mynvlanid & VLAN_IDMASK); 1394 /* not matched? */ 1395 if (vlanid != (myvlanid & VLAN_IDMASK)) 1396 return; 1397 } 1398 1399 switch (x) { 1400 1401 case PROT_ARP: 1402 /* 1403 * We have to deal with two types of ARP packets: 1404 * - REQUEST packets will be answered by sending our 1405 * IP address - if we know it. 1406 * - REPLY packates are expected only after we asked 1407 * for the TFTP server's or the gateway's ethernet 1408 * address; so if we receive such a packet, we set 1409 * the server ethernet address 1410 */ 1411 debug("Got ARP\n"); 1412 1413 arp = (ARP_t *)ip; 1414 if (len < ARP_HDR_SIZE) { 1415 printf("bad length %d < %d\n", len, ARP_HDR_SIZE); 1416 return; 1417 } 1418 if (ntohs(arp->ar_hrd) != ARP_ETHER) { 1419 return; 1420 } 1421 if (ntohs(arp->ar_pro) != PROT_IP) { 1422 return; 1423 } 1424 if (arp->ar_hln != 6) { 1425 return; 1426 } 1427 if (arp->ar_pln != 4) { 1428 return; 1429 } 1430 1431 if (NetOurIP == 0) { 1432 return; 1433 } 1434 1435 if (NetReadIP(&arp->ar_data[16]) != NetOurIP) { 1436 return; 1437 } 1438 1439 switch (ntohs(arp->ar_op)) { 1440 case ARPOP_REQUEST: /* reply with our IP address */ 1441 debug("Got ARP REQUEST, return our IP\n"); 1442 pkt = (uchar *)et; 1443 pkt += NetSetEther(pkt, et->et_src, PROT_ARP); 1444 arp->ar_op = htons(ARPOP_REPLY); 1445 memcpy (&arp->ar_data[10], &arp->ar_data[0], 6); 1446 NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]); 1447 memcpy (&arp->ar_data[ 0], NetOurEther, 6); 1448 NetCopyIP(&arp->ar_data[ 6], &NetOurIP); 1449 (void) eth_send((uchar *)et, (pkt - (uchar *)et) + ARP_HDR_SIZE); 1450 return; 1451 1452 case ARPOP_REPLY: /* arp reply */ 1453 /* are we waiting for a reply */ 1454 if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC) 1455 break; 1456 1457 #ifdef CONFIG_KEEP_SERVERADDR 1458 if (NetServerIP == NetArpWaitPacketIP) { 1459 char buf[20]; 1460 sprintf(buf, "%pM", arp->ar_data); 1461 setenv("serveraddr", buf); 1462 } 1463 #endif 1464 1465 debug("Got ARP REPLY, set server/gtwy eth addr (%pM)\n", 1466 arp->ar_data); 1467 1468 tmp = NetReadIP(&arp->ar_data[6]); 1469 1470 /* matched waiting packet's address */ 1471 if (tmp == NetArpWaitReplyIP) { 1472 debug("Got it\n"); 1473 /* save address for later use */ 1474 memcpy(NetArpWaitPacketMAC, &arp->ar_data[0], 6); 1475 1476 #ifdef CONFIG_NETCONSOLE 1477 (*packetHandler)(0,0,0,0); 1478 #endif 1479 /* modify header, and transmit it */ 1480 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6); 1481 (void) eth_send(NetArpWaitTxPacket, NetArpWaitTxPacketSize); 1482 1483 /* no arp request pending now */ 1484 NetArpWaitPacketIP = 0; 1485 NetArpWaitTxPacketSize = 0; 1486 NetArpWaitPacketMAC = NULL; 1487 1488 } 1489 return; 1490 default: 1491 debug("Unexpected ARP opcode 0x%x\n", ntohs(arp->ar_op)); 1492 return; 1493 } 1494 break; 1495 1496 case PROT_RARP: 1497 debug("Got RARP\n"); 1498 arp = (ARP_t *)ip; 1499 if (len < ARP_HDR_SIZE) { 1500 printf("bad length %d < %d\n", len, ARP_HDR_SIZE); 1501 return; 1502 } 1503 1504 if ((ntohs(arp->ar_op) != RARPOP_REPLY) || 1505 (ntohs(arp->ar_hrd) != ARP_ETHER) || 1506 (ntohs(arp->ar_pro) != PROT_IP) || 1507 (arp->ar_hln != 6) || (arp->ar_pln != 4)) { 1508 1509 puts ("invalid RARP header\n"); 1510 } else { 1511 NetCopyIP(&NetOurIP, &arp->ar_data[16]); 1512 if (NetServerIP == 0) 1513 NetCopyIP(&NetServerIP, &arp->ar_data[ 6]); 1514 memcpy (NetServerEther, &arp->ar_data[ 0], 6); 1515 1516 (*packetHandler)(0,0,0,0); 1517 } 1518 break; 1519 1520 case PROT_IP: 1521 debug("Got IP\n"); 1522 /* Before we start poking the header, make sure it is there */ 1523 if (len < IP_HDR_SIZE) { 1524 debug("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE); 1525 return; 1526 } 1527 /* Check the packet length */ 1528 if (len < ntohs(ip->ip_len)) { 1529 printf("len bad %d < %d\n", len, ntohs(ip->ip_len)); 1530 return; 1531 } 1532 len = ntohs(ip->ip_len); 1533 debug("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff); 1534 1535 /* Can't deal with anything except IPv4 */ 1536 if ((ip->ip_hl_v & 0xf0) != 0x40) { 1537 return; 1538 } 1539 /* Can't deal with IP options (headers != 20 bytes) */ 1540 if ((ip->ip_hl_v & 0x0f) > 0x05) { 1541 return; 1542 } 1543 /* Check the Checksum of the header */ 1544 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) { 1545 puts ("checksum bad\n"); 1546 return; 1547 } 1548 /* If it is not for us, ignore it */ 1549 tmp = NetReadIP(&ip->ip_dst); 1550 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) { 1551 #ifdef CONFIG_MCAST_TFTP 1552 if (Mcast_addr != tmp) 1553 #endif 1554 return; 1555 } 1556 /* 1557 * The function returns the unchanged packet if it's not 1558 * a fragment, and either the complete packet or NULL if 1559 * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL) 1560 */ 1561 if (!(ip = NetDefragment(ip, &len))) 1562 return; 1563 /* 1564 * watch for ICMP host redirects 1565 * 1566 * There is no real handler code (yet). We just watch 1567 * for ICMP host redirect messages. In case anybody 1568 * sees these messages: please contact me 1569 * (wd@denx.de), or - even better - send me the 1570 * necessary fixes :-) 1571 * 1572 * Note: in all cases where I have seen this so far 1573 * it was a problem with the router configuration, 1574 * for instance when a router was configured in the 1575 * BOOTP reply, but the TFTP server was on the same 1576 * subnet. So this is probably a warning that your 1577 * configuration might be wrong. But I'm not really 1578 * sure if there aren't any other situations. 1579 */ 1580 if (ip->ip_p == IPPROTO_ICMP) { 1581 ICMP_t *icmph = (ICMP_t *)&(ip->udp_src); 1582 1583 switch (icmph->type) { 1584 case ICMP_REDIRECT: 1585 if (icmph->code != ICMP_REDIR_HOST) 1586 return; 1587 printf (" ICMP Host Redirect to %pI4 ", &icmph->un.gateway); 1588 return; 1589 #if defined(CONFIG_CMD_PING) 1590 case ICMP_ECHO_REPLY: 1591 /* 1592 * IP header OK. Pass the packet to the current handler. 1593 */ 1594 /* XXX point to ip packet */ 1595 (*packetHandler)((uchar *)ip, 0, 0, 0); 1596 return; 1597 case ICMP_ECHO_REQUEST: 1598 debug("Got ICMP ECHO REQUEST, return %d bytes \n", 1599 ETHER_HDR_SIZE + len); 1600 1601 memcpy (&et->et_dest[0], &et->et_src[0], 6); 1602 memcpy (&et->et_src[ 0], NetOurEther, 6); 1603 1604 ip->ip_sum = 0; 1605 ip->ip_off = 0; 1606 NetCopyIP((void*)&ip->ip_dst, &ip->ip_src); 1607 NetCopyIP((void*)&ip->ip_src, &NetOurIP); 1608 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP >> 1); 1609 1610 icmph->type = ICMP_ECHO_REPLY; 1611 icmph->checksum = 0; 1612 icmph->checksum = ~NetCksum((uchar *)icmph, 1613 (len - IP_HDR_SIZE_NO_UDP) >> 1); 1614 (void) eth_send((uchar *)et, ETHER_HDR_SIZE + len); 1615 return; 1616 #endif 1617 default: 1618 return; 1619 } 1620 } else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */ 1621 return; 1622 } 1623 1624 #ifdef CONFIG_UDP_CHECKSUM 1625 if (ip->udp_xsum != 0) { 1626 ulong xsum; 1627 ushort *sumptr; 1628 ushort sumlen; 1629 1630 xsum = ip->ip_p; 1631 xsum += (ntohs(ip->udp_len)); 1632 xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff; 1633 xsum += (ntohl(ip->ip_src) >> 0) & 0x0000ffff; 1634 xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff; 1635 xsum += (ntohl(ip->ip_dst) >> 0) & 0x0000ffff; 1636 1637 sumlen = ntohs(ip->udp_len); 1638 sumptr = (ushort *) &(ip->udp_src); 1639 1640 while (sumlen > 1) { 1641 ushort sumdata; 1642 1643 sumdata = *sumptr++; 1644 xsum += ntohs(sumdata); 1645 sumlen -= 2; 1646 } 1647 if (sumlen > 0) { 1648 ushort sumdata; 1649 1650 sumdata = *(unsigned char *) sumptr; 1651 sumdata = (sumdata << 8) & 0xff00; 1652 xsum += sumdata; 1653 } 1654 while ((xsum >> 16) != 0) { 1655 xsum = (xsum & 0x0000ffff) + ((xsum >> 16) & 0x0000ffff); 1656 } 1657 if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) { 1658 printf(" UDP wrong checksum %08lx %08x\n", 1659 xsum, ntohs(ip->udp_xsum)); 1660 return; 1661 } 1662 } 1663 #endif 1664 1665 1666 #ifdef CONFIG_NETCONSOLE 1667 nc_input_packet((uchar *)ip +IP_HDR_SIZE, 1668 ntohs(ip->udp_dst), 1669 ntohs(ip->udp_src), 1670 ntohs(ip->udp_len) - 8); 1671 #endif 1672 /* 1673 * IP header OK. Pass the packet to the current handler. 1674 */ 1675 (*packetHandler)((uchar *)ip +IP_HDR_SIZE, 1676 ntohs(ip->udp_dst), 1677 ntohs(ip->udp_src), 1678 ntohs(ip->udp_len) - 8); 1679 break; 1680 } 1681 } 1682 1683 1684 /**********************************************************************/ 1685 1686 static int net_check_prereq (proto_t protocol) 1687 { 1688 switch (protocol) { 1689 /* Fall through */ 1690 #if defined(CONFIG_CMD_PING) 1691 case PING: 1692 if (NetPingIP == 0) { 1693 puts ("*** ERROR: ping address not given\n"); 1694 return (1); 1695 } 1696 goto common; 1697 #endif 1698 #if defined(CONFIG_CMD_SNTP) 1699 case SNTP: 1700 if (NetNtpServerIP == 0) { 1701 puts ("*** ERROR: NTP server address not given\n"); 1702 return (1); 1703 } 1704 goto common; 1705 #endif 1706 #if defined(CONFIG_CMD_DNS) 1707 case DNS: 1708 if (NetOurDNSIP == 0) { 1709 puts("*** ERROR: DNS server address not given\n"); 1710 return 1; 1711 } 1712 goto common; 1713 #endif 1714 #if defined(CONFIG_CMD_NFS) 1715 case NFS: 1716 #endif 1717 case NETCONS: 1718 case TFTP: 1719 if (NetServerIP == 0) { 1720 puts ("*** ERROR: `serverip' not set\n"); 1721 return (1); 1722 } 1723 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) 1724 common: 1725 #endif 1726 1727 if (NetOurIP == 0) { 1728 puts ("*** ERROR: `ipaddr' not set\n"); 1729 return (1); 1730 } 1731 /* Fall through */ 1732 1733 case DHCP: 1734 case RARP: 1735 case BOOTP: 1736 case CDP: 1737 if (memcmp (NetOurEther, "\0\0\0\0\0\0", 6) == 0) { 1738 #ifdef CONFIG_NET_MULTI 1739 extern int eth_get_dev_index (void); 1740 int num = eth_get_dev_index (); 1741 1742 switch (num) { 1743 case -1: 1744 puts ("*** ERROR: No ethernet found.\n"); 1745 return (1); 1746 case 0: 1747 puts ("*** ERROR: `ethaddr' not set\n"); 1748 break; 1749 default: 1750 printf ("*** ERROR: `eth%daddr' not set\n", 1751 num); 1752 break; 1753 } 1754 1755 NetStartAgain (); 1756 return (2); 1757 #else 1758 puts ("*** ERROR: `ethaddr' not set\n"); 1759 return (1); 1760 #endif 1761 } 1762 /* Fall through */ 1763 default: 1764 return (0); 1765 } 1766 return (0); /* OK */ 1767 } 1768 /**********************************************************************/ 1769 1770 int 1771 NetCksumOk(uchar * ptr, int len) 1772 { 1773 return !((NetCksum(ptr, len) + 1) & 0xfffe); 1774 } 1775 1776 1777 unsigned 1778 NetCksum(uchar * ptr, int len) 1779 { 1780 ulong xsum; 1781 ushort *p = (ushort *)ptr; 1782 1783 xsum = 0; 1784 while (len-- > 0) 1785 xsum += *p++; 1786 xsum = (xsum & 0xffff) + (xsum >> 16); 1787 xsum = (xsum & 0xffff) + (xsum >> 16); 1788 return (xsum & 0xffff); 1789 } 1790 1791 int 1792 NetEthHdrSize(void) 1793 { 1794 ushort myvlanid; 1795 1796 myvlanid = ntohs(NetOurVLAN); 1797 if (myvlanid == (ushort)-1) 1798 myvlanid = VLAN_NONE; 1799 1800 return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : VLAN_ETHER_HDR_SIZE; 1801 } 1802 1803 int 1804 NetSetEther(volatile uchar * xet, uchar * addr, uint prot) 1805 { 1806 Ethernet_t *et = (Ethernet_t *)xet; 1807 ushort myvlanid; 1808 1809 myvlanid = ntohs(NetOurVLAN); 1810 if (myvlanid == (ushort)-1) 1811 myvlanid = VLAN_NONE; 1812 1813 memcpy (et->et_dest, addr, 6); 1814 memcpy (et->et_src, NetOurEther, 6); 1815 if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) { 1816 et->et_protlen = htons(prot); 1817 return ETHER_HDR_SIZE; 1818 } else { 1819 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet; 1820 1821 vet->vet_vlan_type = htons(PROT_VLAN); 1822 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK)); 1823 vet->vet_type = htons(prot); 1824 return VLAN_ETHER_HDR_SIZE; 1825 } 1826 } 1827 1828 void 1829 NetSetIP(volatile uchar * xip, IPaddr_t dest, int dport, int sport, int len) 1830 { 1831 IP_t *ip = (IP_t *)xip; 1832 1833 /* 1834 * If the data is an odd number of bytes, zero the 1835 * byte after the last byte so that the checksum 1836 * will work. 1837 */ 1838 if (len & 1) 1839 xip[IP_HDR_SIZE + len] = 0; 1840 1841 /* 1842 * Construct an IP and UDP header. 1843 * (need to set no fragment bit - XXX) 1844 */ 1845 ip->ip_hl_v = 0x45; /* IP_HDR_SIZE / 4 (not including UDP) */ 1846 ip->ip_tos = 0; 1847 ip->ip_len = htons(IP_HDR_SIZE + len); 1848 ip->ip_id = htons(NetIPID++); 1849 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ 1850 ip->ip_ttl = 255; 1851 ip->ip_p = 17; /* UDP */ 1852 ip->ip_sum = 0; 1853 NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */ 1854 NetCopyIP((void*)&ip->ip_dst, &dest); /* - "" - */ 1855 ip->udp_src = htons(sport); 1856 ip->udp_dst = htons(dport); 1857 ip->udp_len = htons(8 + len); 1858 ip->udp_xsum = 0; 1859 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2); 1860 } 1861 1862 void copy_filename (char *dst, char *src, int size) 1863 { 1864 if (*src && (*src == '"')) { 1865 ++src; 1866 --size; 1867 } 1868 1869 while ((--size > 0) && *src && (*src != '"')) { 1870 *dst++ = *src++; 1871 } 1872 *dst = '\0'; 1873 } 1874 1875 #endif 1876 1877 #if defined(CONFIG_CMD_NFS) || defined(CONFIG_CMD_SNTP) || defined(CONFIG_CMD_DNS) 1878 /* 1879 * make port a little random, but use something trivial to compute 1880 */ 1881 unsigned int random_port(void) 1882 { 1883 return 1024 + (get_timer(0) % 0x8000);; 1884 } 1885 #endif 1886 1887 void ip_to_string (IPaddr_t x, char *s) 1888 { 1889 x = ntohl (x); 1890 sprintf (s, "%d.%d.%d.%d", 1891 (int) ((x >> 24) & 0xff), 1892 (int) ((x >> 16) & 0xff), 1893 (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff) 1894 ); 1895 } 1896 1897 IPaddr_t string_to_ip(char *s) 1898 { 1899 IPaddr_t addr; 1900 char *e; 1901 int i; 1902 1903 if (s == NULL) 1904 return(0); 1905 1906 for (addr=0, i=0; i<4; ++i) { 1907 ulong val = s ? simple_strtoul(s, &e, 10) : 0; 1908 addr <<= 8; 1909 addr |= (val & 0xFF); 1910 if (s) { 1911 s = (*e) ? e+1 : e; 1912 } 1913 } 1914 1915 return (htonl(addr)); 1916 } 1917 1918 void VLAN_to_string(ushort x, char *s) 1919 { 1920 x = ntohs(x); 1921 1922 if (x == (ushort)-1) 1923 x = VLAN_NONE; 1924 1925 if (x == VLAN_NONE) 1926 strcpy(s, "none"); 1927 else 1928 sprintf(s, "%d", x & VLAN_IDMASK); 1929 } 1930 1931 ushort string_to_VLAN(char *s) 1932 { 1933 ushort id; 1934 1935 if (s == NULL) 1936 return htons(VLAN_NONE); 1937 1938 if (*s < '0' || *s > '9') 1939 id = VLAN_NONE; 1940 else 1941 id = (ushort)simple_strtoul(s, NULL, 10); 1942 1943 return htons(id); 1944 } 1945 1946 IPaddr_t getenv_IPaddr (char *var) 1947 { 1948 return (string_to_ip(getenv(var))); 1949 } 1950 1951 ushort getenv_VLAN(char *var) 1952 { 1953 return (string_to_VLAN(getenv(var))); 1954 } 1955