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