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