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 #ifdef CONFIG_CMD_TFTPPUT 219 static rxhand_icmp_f *packet_icmp_handler; /* Current ICMP rx handler */ 220 #endif 221 /* Current timeout handler */ 222 static thand_f *timeHandler; 223 /* Time base value */ 224 static ulong timeStart; 225 /* Current timeout value */ 226 static ulong timeDelta; 227 /* THE transmit packet */ 228 volatile uchar *NetTxPacket; 229 230 static int net_check_prereq(enum proto_t protocol); 231 232 static int NetTryCount; 233 234 /**********************************************************************/ 235 236 IPaddr_t NetArpWaitPacketIP; 237 IPaddr_t NetArpWaitReplyIP; 238 /* MAC address of waiting packet's destination */ 239 uchar *NetArpWaitPacketMAC; 240 /* THE transmit packet */ 241 uchar *NetArpWaitTxPacket; 242 int NetArpWaitTxPacketSize; 243 uchar NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN]; 244 ulong NetArpWaitTimerStart; 245 int NetArpWaitTry; 246 247 void ArpRequest(void) 248 { 249 int i; 250 volatile uchar *pkt; 251 ARP_t *arp; 252 253 debug("ARP broadcast %d\n", NetArpWaitTry); 254 255 pkt = NetTxPacket; 256 257 pkt += NetSetEther(pkt, NetBcastAddr, PROT_ARP); 258 259 arp = (ARP_t *) pkt; 260 261 arp->ar_hrd = htons(ARP_ETHER); 262 arp->ar_pro = htons(PROT_IP); 263 arp->ar_hln = 6; 264 arp->ar_pln = 4; 265 arp->ar_op = htons(ARPOP_REQUEST); 266 267 /* source ET addr */ 268 memcpy(&arp->ar_data[0], NetOurEther, 6); 269 /* source IP addr */ 270 NetWriteIP((uchar *) &arp->ar_data[6], NetOurIP); 271 for (i = 10; i < 16; ++i) { 272 /* dest ET addr = 0 */ 273 arp->ar_data[i] = 0; 274 } 275 276 if ((NetArpWaitPacketIP & NetOurSubnetMask) != 277 (NetOurIP & NetOurSubnetMask)) { 278 if (NetOurGatewayIP == 0) { 279 puts("## Warning: gatewayip needed but not set\n"); 280 NetArpWaitReplyIP = NetArpWaitPacketIP; 281 } else { 282 NetArpWaitReplyIP = NetOurGatewayIP; 283 } 284 } else { 285 NetArpWaitReplyIP = NetArpWaitPacketIP; 286 } 287 288 NetWriteIP((uchar *) &arp->ar_data[16], NetArpWaitReplyIP); 289 (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE); 290 } 291 292 void ArpTimeoutCheck(void) 293 { 294 ulong t; 295 296 if (!NetArpWaitPacketIP) 297 return; 298 299 t = get_timer(0); 300 301 /* check for arp timeout */ 302 if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT) { 303 NetArpWaitTry++; 304 305 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) { 306 puts("\nARP Retry count exceeded; starting again\n"); 307 NetArpWaitTry = 0; 308 NetStartAgain(); 309 } else { 310 NetArpWaitTimerStart = t; 311 ArpRequest(); 312 } 313 } 314 } 315 316 static void NetInitLoop(enum proto_t protocol) 317 { 318 static int env_changed_id; 319 bd_t *bd = gd->bd; 320 int env_id = get_env_id(); 321 322 /* update only when the environment has changed */ 323 if (env_changed_id != env_id) { 324 NetOurIP = getenv_IPaddr("ipaddr"); 325 NetCopyIP(&bd->bi_ip_addr, &NetOurIP); 326 NetOurGatewayIP = getenv_IPaddr("gatewayip"); 327 NetOurSubnetMask = getenv_IPaddr("netmask"); 328 NetServerIP = getenv_IPaddr("serverip"); 329 NetOurNativeVLAN = getenv_VLAN("nvlan"); 330 NetOurVLAN = getenv_VLAN("vlan"); 331 #if defined(CONFIG_CMD_DNS) 332 NetOurDNSIP = getenv_IPaddr("dnsip"); 333 #endif 334 env_changed_id = env_id; 335 } 336 337 return; 338 } 339 340 /**********************************************************************/ 341 /* 342 * Main network processing loop. 343 */ 344 345 int NetLoop(enum 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 NetBootFileXferSize = 0; 411 switch (protocol) { 412 case TFTPGET: 413 #ifdef CONFIG_CMD_TFTPPUT 414 case TFTPPUT: 415 #endif 416 /* always use ARP to get server ethernet address */ 417 TftpStart(protocol); 418 break; 419 #ifdef CONFIG_CMD_TFTPSRV 420 case TFTPSRV: 421 TftpStartServer(); 422 break; 423 #endif 424 #if defined(CONFIG_CMD_DHCP) 425 case DHCP: 426 BootpTry = 0; 427 NetOurIP = 0; 428 DhcpRequest(); /* Basically same as BOOTP */ 429 break; 430 #endif 431 432 case BOOTP: 433 BootpTry = 0; 434 NetOurIP = 0; 435 BootpRequest(); 436 break; 437 438 #if defined(CONFIG_CMD_RARP) 439 case RARP: 440 RarpTry = 0; 441 NetOurIP = 0; 442 RarpRequest(); 443 break; 444 #endif 445 #if defined(CONFIG_CMD_PING) 446 case PING: 447 PingStart(); 448 break; 449 #endif 450 #if defined(CONFIG_CMD_NFS) 451 case NFS: 452 NfsStart(); 453 break; 454 #endif 455 #if defined(CONFIG_CMD_CDP) 456 case CDP: 457 CDPStart(); 458 break; 459 #endif 460 #ifdef CONFIG_NETCONSOLE 461 case NETCONS: 462 NcStart(); 463 break; 464 #endif 465 #if defined(CONFIG_CMD_SNTP) 466 case SNTP: 467 SntpStart(); 468 break; 469 #endif 470 #if defined(CONFIG_CMD_DNS) 471 case DNS: 472 DnsStart(); 473 break; 474 #endif 475 default: 476 break; 477 } 478 479 break; 480 } 481 482 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 483 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ 484 defined(CONFIG_STATUS_LED) && \ 485 defined(STATUS_LED_RED) 486 /* 487 * Echo the inverted link state to the fault LED. 488 */ 489 if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) 490 status_led_set(STATUS_LED_RED, STATUS_LED_OFF); 491 else 492 status_led_set(STATUS_LED_RED, STATUS_LED_ON); 493 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 494 #endif /* CONFIG_MII, ... */ 495 496 /* 497 * Main packet reception loop. Loop receiving packets until 498 * someone sets `NetState' to a state that terminates. 499 */ 500 for (;;) { 501 WATCHDOG_RESET(); 502 #ifdef CONFIG_SHOW_ACTIVITY 503 { 504 extern void show_activity(int arg); 505 show_activity(1); 506 } 507 #endif 508 /* 509 * Check the ethernet for a new packet. The ethernet 510 * receive routine will process it. 511 */ 512 eth_rx(); 513 514 /* 515 * Abort if ctrl-c was pressed. 516 */ 517 if (ctrlc()) { 518 eth_halt(); 519 puts("\nAbort\n"); 520 goto done; 521 } 522 523 ArpTimeoutCheck(); 524 525 /* 526 * Check for a timeout, and run the timeout handler 527 * if we have one. 528 */ 529 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) { 530 thand_f *x; 531 532 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 533 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ 534 defined(CONFIG_STATUS_LED) && \ 535 defined(STATUS_LED_RED) 536 /* 537 * Echo the inverted link state to the fault LED. 538 */ 539 if (miiphy_link(eth_get_dev()->name, 540 CONFIG_SYS_FAULT_MII_ADDR)) { 541 status_led_set(STATUS_LED_RED, STATUS_LED_OFF); 542 } else { 543 status_led_set(STATUS_LED_RED, STATUS_LED_ON); 544 } 545 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 546 #endif /* CONFIG_MII, ... */ 547 x = timeHandler; 548 timeHandler = (thand_f *)0; 549 (*x)(); 550 } 551 552 553 switch (NetState) { 554 555 case NETLOOP_RESTART: 556 NetRestarted = 1; 557 goto restart; 558 559 case NETLOOP_SUCCESS: 560 if (NetBootFileXferSize > 0) { 561 char buf[20]; 562 printf("Bytes transferred = %ld (%lx hex)\n", 563 NetBootFileXferSize, 564 NetBootFileXferSize); 565 sprintf(buf, "%lX", NetBootFileXferSize); 566 setenv("filesize", buf); 567 568 sprintf(buf, "%lX", (unsigned long)load_addr); 569 setenv("fileaddr", buf); 570 } 571 eth_halt(); 572 ret = NetBootFileXferSize; 573 goto done; 574 575 case NETLOOP_FAIL: 576 goto done; 577 } 578 } 579 580 done: 581 #ifdef CONFIG_CMD_TFTPPUT 582 /* Clear out the handlers */ 583 NetSetHandler(NULL); 584 net_set_icmp_handler(NULL); 585 #endif 586 return ret; 587 } 588 589 /**********************************************************************/ 590 591 static void 592 startAgainTimeout(void) 593 { 594 NetState = NETLOOP_RESTART; 595 } 596 597 static void 598 startAgainHandler(uchar *pkt, unsigned dest, IPaddr_t sip, 599 unsigned src, unsigned len) 600 { 601 /* Totally ignore the packet */ 602 } 603 604 void NetStartAgain(void) 605 { 606 char *nretry; 607 int retry_forever = 0; 608 unsigned long retrycnt = 0; 609 610 nretry = getenv("netretry"); 611 if (nretry) { 612 if (!strcmp(nretry, "yes")) 613 retry_forever = 1; 614 else if (!strcmp(nretry, "no")) 615 retrycnt = 0; 616 else if (!strcmp(nretry, "once")) 617 retrycnt = 1; 618 else 619 retrycnt = simple_strtoul(nretry, NULL, 0); 620 } else 621 retry_forever = 1; 622 623 if ((!retry_forever) && (NetTryCount >= retrycnt)) { 624 eth_halt(); 625 NetState = NETLOOP_FAIL; 626 return; 627 } 628 629 NetTryCount++; 630 631 eth_halt(); 632 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER) 633 eth_try_another(!NetRestarted); 634 #endif 635 eth_init(gd->bd); 636 if (NetRestartWrap) { 637 NetRestartWrap = 0; 638 if (NetDevExists) { 639 NetSetTimeout(10000UL, startAgainTimeout); 640 NetSetHandler(startAgainHandler); 641 } else { 642 NetState = NETLOOP_FAIL; 643 } 644 } else { 645 NetState = NETLOOP_RESTART; 646 } 647 } 648 649 /**********************************************************************/ 650 /* 651 * Miscelaneous bits. 652 */ 653 654 void 655 NetSetHandler(rxhand_f *f) 656 { 657 packetHandler = f; 658 } 659 660 #ifdef CONFIG_CMD_TFTPPUT 661 void net_set_icmp_handler(rxhand_icmp_f *f) 662 { 663 packet_icmp_handler = f; 664 } 665 #endif 666 667 void 668 NetSetTimeout(ulong iv, thand_f *f) 669 { 670 if (iv == 0) { 671 timeHandler = (thand_f *)0; 672 } else { 673 timeHandler = f; 674 timeStart = get_timer(0); 675 timeDelta = iv; 676 } 677 } 678 679 680 void 681 NetSendPacket(volatile uchar *pkt, int len) 682 { 683 (void) eth_send(pkt, len); 684 } 685 686 int 687 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len) 688 { 689 uchar *pkt; 690 691 /* convert to new style broadcast */ 692 if (dest == 0) 693 dest = 0xFFFFFFFF; 694 695 /* if broadcast, make the ether address a broadcast and don't do ARP */ 696 if (dest == 0xFFFFFFFF) 697 ether = NetBcastAddr; 698 699 /* 700 * if MAC address was not discovered yet, save the packet and do 701 * an ARP request 702 */ 703 if (memcmp(ether, NetEtherNullAddr, 6) == 0) { 704 705 debug("sending ARP for %08lx\n", dest); 706 707 NetArpWaitPacketIP = dest; 708 NetArpWaitPacketMAC = ether; 709 710 pkt = NetArpWaitTxPacket; 711 pkt += NetSetEther(pkt, NetArpWaitPacketMAC, PROT_IP); 712 713 NetSetIP(pkt, dest, dport, sport, len); 714 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + 715 (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len); 716 717 /* size of the waiting packet */ 718 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + 719 IP_HDR_SIZE + len; 720 721 /* and do the ARP request */ 722 NetArpWaitTry = 1; 723 NetArpWaitTimerStart = get_timer(0); 724 ArpRequest(); 725 return 1; /* waiting */ 726 } 727 728 debug("sending UDP to %08lx/%pM\n", dest, ether); 729 730 pkt = (uchar *)NetTxPacket; 731 pkt += NetSetEther(pkt, ether, PROT_IP); 732 NetSetIP(pkt, dest, dport, sport, len); 733 (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len); 734 735 return 0; /* transmitted */ 736 } 737 738 #if defined(CONFIG_CMD_PING) 739 static ushort PingSeqNo; 740 741 int PingSend(void) 742 { 743 static uchar mac[6]; 744 volatile IP_t *ip; 745 volatile ushort *s; 746 uchar *pkt; 747 748 /* XXX always send arp request */ 749 750 memcpy(mac, NetEtherNullAddr, 6); 751 752 debug("sending ARP for %08lx\n", NetPingIP); 753 754 NetArpWaitPacketIP = NetPingIP; 755 NetArpWaitPacketMAC = mac; 756 757 pkt = NetArpWaitTxPacket; 758 pkt += NetSetEther(pkt, mac, PROT_IP); 759 760 ip = (volatile IP_t *)pkt; 761 762 /* 763 * Construct an IP and ICMP header. 764 * (need to set no fragment bit - XXX) 765 */ 766 /* IP_HDR_SIZE / 4 (not including UDP) */ 767 ip->ip_hl_v = 0x45; 768 ip->ip_tos = 0; 769 ip->ip_len = htons(IP_HDR_SIZE_NO_UDP + 8); 770 ip->ip_id = htons(NetIPID++); 771 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ 772 ip->ip_ttl = 255; 773 ip->ip_p = 0x01; /* ICMP */ 774 ip->ip_sum = 0; 775 /* already in network byte order */ 776 NetCopyIP((void *)&ip->ip_src, &NetOurIP); 777 /* - "" - */ 778 NetCopyIP((void *)&ip->ip_dst, &NetPingIP); 779 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2); 780 781 s = &ip->udp_src; /* XXX ICMP starts here */ 782 s[0] = htons(0x0800); /* echo-request, code */ 783 s[1] = 0; /* checksum */ 784 s[2] = 0; /* identifier */ 785 s[3] = htons(PingSeqNo++); /* sequence number */ 786 s[1] = ~NetCksum((uchar *)s, 8/2); 787 788 /* size of the waiting packet */ 789 NetArpWaitTxPacketSize = 790 (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8; 791 792 /* and do the ARP request */ 793 NetArpWaitTry = 1; 794 NetArpWaitTimerStart = get_timer(0); 795 ArpRequest(); 796 return 1; /* waiting */ 797 } 798 799 static void 800 PingTimeout(void) 801 { 802 eth_halt(); 803 NetState = NETLOOP_FAIL; /* we did not get the reply */ 804 } 805 806 static void 807 PingHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 808 unsigned len) 809 { 810 if (sip != NetPingIP) 811 return; 812 813 NetState = NETLOOP_SUCCESS; 814 } 815 816 static void PingStart(void) 817 { 818 printf("Using %s device\n", eth_get_name()); 819 NetSetTimeout(10000UL, PingTimeout); 820 NetSetHandler(PingHandler); 821 822 PingSend(); 823 } 824 #endif 825 826 #if defined(CONFIG_CMD_CDP) 827 828 #define CDP_DEVICE_ID_TLV 0x0001 829 #define CDP_ADDRESS_TLV 0x0002 830 #define CDP_PORT_ID_TLV 0x0003 831 #define CDP_CAPABILITIES_TLV 0x0004 832 #define CDP_VERSION_TLV 0x0005 833 #define CDP_PLATFORM_TLV 0x0006 834 #define CDP_NATIVE_VLAN_TLV 0x000a 835 #define CDP_APPLIANCE_VLAN_TLV 0x000e 836 #define CDP_TRIGGER_TLV 0x000f 837 #define CDP_POWER_CONSUMPTION_TLV 0x0010 838 #define CDP_SYSNAME_TLV 0x0014 839 #define CDP_SYSOBJECT_TLV 0x0015 840 #define CDP_MANAGEMENT_ADDRESS_TLV 0x0016 841 842 #define CDP_TIMEOUT 250UL /* one packet every 250ms */ 843 844 static int CDPSeq; 845 static int CDPOK; 846 847 ushort CDPNativeVLAN; 848 ushort CDPApplianceVLAN; 849 850 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 851 0x00 }; 852 853 static ushort CDP_compute_csum(const uchar *buff, ushort len) 854 { 855 ushort csum; 856 int odd; 857 ulong result = 0; 858 ushort leftover; 859 ushort *p; 860 861 if (len > 0) { 862 odd = 1 & (ulong)buff; 863 if (odd) { 864 result = *buff << 8; 865 len--; 866 buff++; 867 } 868 while (len > 1) { 869 p = (ushort *)buff; 870 result += *p++; 871 buff = (uchar *)p; 872 if (result & 0x80000000) 873 result = (result & 0xFFFF) + (result >> 16); 874 len -= 2; 875 } 876 if (len) { 877 leftover = (signed short)(*(const signed char *)buff); 878 /* CISCO SUCKS big time! (and blows too): 879 * CDP uses the IP checksum algorithm with a twist; 880 * for the last byte it *sign* extends and sums. 881 */ 882 result = (result & 0xffff0000) | 883 ((result + leftover) & 0x0000ffff); 884 } 885 while (result >> 16) 886 result = (result & 0xFFFF) + (result >> 16); 887 888 if (odd) 889 result = ((result >> 8) & 0xff) | 890 ((result & 0xff) << 8); 891 } 892 893 /* add up 16-bit and 17-bit words for 17+c bits */ 894 result = (result & 0xffff) + (result >> 16); 895 /* add up 16-bit and 2-bit for 16+c bit */ 896 result = (result & 0xffff) + (result >> 16); 897 /* add up carry.. */ 898 result = (result & 0xffff) + (result >> 16); 899 900 /* negate */ 901 csum = ~(ushort)result; 902 903 /* run time endian detection */ 904 if (csum != htons(csum)) /* little endian */ 905 csum = htons(csum); 906 907 return csum; 908 } 909 910 int CDPSendTrigger(void) 911 { 912 volatile uchar *pkt; 913 volatile ushort *s; 914 volatile ushort *cp; 915 Ethernet_t *et; 916 int len; 917 ushort chksum; 918 #if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID) || \ 919 defined(CONFIG_CDP_VERSION) || defined(CONFIG_CDP_PLATFORM) 920 char buf[32]; 921 #endif 922 923 pkt = NetTxPacket; 924 et = (Ethernet_t *)pkt; 925 926 /* NOTE: trigger sent not on any VLAN */ 927 928 /* form ethernet header */ 929 memcpy(et->et_dest, NetCDPAddr, 6); 930 memcpy(et->et_src, NetOurEther, 6); 931 932 pkt += ETHER_HDR_SIZE; 933 934 /* SNAP header */ 935 memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)); 936 pkt += sizeof(CDP_SNAP_hdr); 937 938 /* CDP header */ 939 *pkt++ = 0x02; /* CDP version 2 */ 940 *pkt++ = 180; /* TTL */ 941 s = (volatile ushort *)pkt; 942 cp = s; 943 /* checksum (0 for later calculation) */ 944 *s++ = htons(0); 945 946 /* CDP fields */ 947 #ifdef CONFIG_CDP_DEVICE_ID 948 *s++ = htons(CDP_DEVICE_ID_TLV); 949 *s++ = htons(CONFIG_CDP_DEVICE_ID); 950 sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%pm", NetOurEther); 951 memcpy((uchar *)s, buf, 16); 952 s += 16 / 2; 953 #endif 954 955 #ifdef CONFIG_CDP_PORT_ID 956 *s++ = htons(CDP_PORT_ID_TLV); 957 memset(buf, 0, sizeof(buf)); 958 sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index()); 959 len = strlen(buf); 960 if (len & 1) /* make it even */ 961 len++; 962 *s++ = htons(len + 4); 963 memcpy((uchar *)s, buf, len); 964 s += len / 2; 965 #endif 966 967 #ifdef CONFIG_CDP_CAPABILITIES 968 *s++ = htons(CDP_CAPABILITIES_TLV); 969 *s++ = htons(8); 970 *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES); 971 s += 2; 972 #endif 973 974 #ifdef CONFIG_CDP_VERSION 975 *s++ = htons(CDP_VERSION_TLV); 976 memset(buf, 0, sizeof(buf)); 977 strcpy(buf, CONFIG_CDP_VERSION); 978 len = strlen(buf); 979 if (len & 1) /* make it even */ 980 len++; 981 *s++ = htons(len + 4); 982 memcpy((uchar *)s, buf, len); 983 s += len / 2; 984 #endif 985 986 #ifdef CONFIG_CDP_PLATFORM 987 *s++ = htons(CDP_PLATFORM_TLV); 988 memset(buf, 0, sizeof(buf)); 989 strcpy(buf, CONFIG_CDP_PLATFORM); 990 len = strlen(buf); 991 if (len & 1) /* make it even */ 992 len++; 993 *s++ = htons(len + 4); 994 memcpy((uchar *)s, buf, len); 995 s += len / 2; 996 #endif 997 998 #ifdef CONFIG_CDP_TRIGGER 999 *s++ = htons(CDP_TRIGGER_TLV); 1000 *s++ = htons(8); 1001 *(ulong *)s = htonl(CONFIG_CDP_TRIGGER); 1002 s += 2; 1003 #endif 1004 1005 #ifdef CONFIG_CDP_POWER_CONSUMPTION 1006 *s++ = htons(CDP_POWER_CONSUMPTION_TLV); 1007 *s++ = htons(6); 1008 *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION); 1009 #endif 1010 1011 /* length of ethernet packet */ 1012 len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE); 1013 et->et_protlen = htons(len); 1014 1015 len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr); 1016 chksum = CDP_compute_csum((uchar *)NetTxPacket + len, 1017 (uchar *)s - (NetTxPacket + len)); 1018 if (chksum == 0) 1019 chksum = 0xFFFF; 1020 *cp = htons(chksum); 1021 1022 (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket); 1023 return 0; 1024 } 1025 1026 static void 1027 CDPTimeout(void) 1028 { 1029 CDPSeq++; 1030 1031 if (CDPSeq < 3) { 1032 NetSetTimeout(CDP_TIMEOUT, CDPTimeout); 1033 CDPSendTrigger(); 1034 return; 1035 } 1036 1037 /* if not OK try again */ 1038 if (!CDPOK) 1039 NetStartAgain(); 1040 else 1041 NetState = NETLOOP_SUCCESS; 1042 } 1043 1044 static void 1045 CDPDummyHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 1046 unsigned len) 1047 { 1048 /* nothing */ 1049 } 1050 1051 static void 1052 CDPHandler(const uchar *pkt, unsigned len) 1053 { 1054 const uchar *t; 1055 const ushort *ss; 1056 ushort type, tlen; 1057 uchar applid; 1058 ushort vlan, nvlan; 1059 1060 /* minimum size? */ 1061 if (len < sizeof(CDP_SNAP_hdr) + 4) 1062 goto pkt_short; 1063 1064 /* check for valid CDP SNAP header */ 1065 if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0) 1066 return; 1067 1068 pkt += sizeof(CDP_SNAP_hdr); 1069 len -= sizeof(CDP_SNAP_hdr); 1070 1071 /* Version of CDP protocol must be >= 2 and TTL != 0 */ 1072 if (pkt[0] < 0x02 || pkt[1] == 0) 1073 return; 1074 1075 /* 1076 * if version is greater than 0x02 maybe we'll have a problem; 1077 * output a warning 1078 */ 1079 if (pkt[0] != 0x02) 1080 printf("** WARNING: CDP packet received with a protocol version %d > 2\n", 1081 pkt[0] & 0xff); 1082 1083 if (CDP_compute_csum(pkt, len) != 0) 1084 return; 1085 1086 pkt += 4; 1087 len -= 4; 1088 1089 vlan = htons(-1); 1090 nvlan = htons(-1); 1091 while (len > 0) { 1092 if (len < 4) 1093 goto pkt_short; 1094 1095 ss = (const ushort *)pkt; 1096 type = ntohs(ss[0]); 1097 tlen = ntohs(ss[1]); 1098 if (tlen > len) 1099 goto pkt_short; 1100 1101 pkt += tlen; 1102 len -= tlen; 1103 1104 ss += 2; /* point ss to the data of the TLV */ 1105 tlen -= 4; 1106 1107 switch (type) { 1108 case CDP_DEVICE_ID_TLV: 1109 break; 1110 case CDP_ADDRESS_TLV: 1111 break; 1112 case CDP_PORT_ID_TLV: 1113 break; 1114 case CDP_CAPABILITIES_TLV: 1115 break; 1116 case CDP_VERSION_TLV: 1117 break; 1118 case CDP_PLATFORM_TLV: 1119 break; 1120 case CDP_NATIVE_VLAN_TLV: 1121 nvlan = *ss; 1122 break; 1123 case CDP_APPLIANCE_VLAN_TLV: 1124 t = (const uchar *)ss; 1125 while (tlen > 0) { 1126 if (tlen < 3) 1127 goto pkt_short; 1128 1129 applid = t[0]; 1130 ss = (const ushort *)(t + 1); 1131 1132 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE 1133 if (applid == CONFIG_CDP_APPLIANCE_VLAN_TYPE) 1134 vlan = *ss; 1135 #else 1136 /* XXX will this work; dunno */ 1137 vlan = ntohs(*ss); 1138 #endif 1139 t += 3; tlen -= 3; 1140 } 1141 break; 1142 case CDP_TRIGGER_TLV: 1143 break; 1144 case CDP_POWER_CONSUMPTION_TLV: 1145 break; 1146 case CDP_SYSNAME_TLV: 1147 break; 1148 case CDP_SYSOBJECT_TLV: 1149 break; 1150 case CDP_MANAGEMENT_ADDRESS_TLV: 1151 break; 1152 } 1153 } 1154 1155 CDPApplianceVLAN = vlan; 1156 CDPNativeVLAN = nvlan; 1157 1158 CDPOK = 1; 1159 return; 1160 1161 pkt_short: 1162 printf("** CDP packet is too short\n"); 1163 return; 1164 } 1165 1166 static void CDPStart(void) 1167 { 1168 printf("Using %s device\n", eth_get_name()); 1169 CDPSeq = 0; 1170 CDPOK = 0; 1171 1172 CDPNativeVLAN = htons(-1); 1173 CDPApplianceVLAN = htons(-1); 1174 1175 NetSetTimeout(CDP_TIMEOUT, CDPTimeout); 1176 NetSetHandler(CDPDummyHandler); 1177 1178 CDPSendTrigger(); 1179 } 1180 #endif 1181 1182 #ifdef CONFIG_IP_DEFRAG 1183 /* 1184 * This function collects fragments in a single packet, according 1185 * to the algorithm in RFC815. It returns NULL or the pointer to 1186 * a complete packet, in static storage 1187 */ 1188 #ifndef CONFIG_NET_MAXDEFRAG 1189 #define CONFIG_NET_MAXDEFRAG 16384 1190 #endif 1191 /* 1192 * MAXDEFRAG, above, is chosen in the config file and is real data 1193 * so we need to add the NFS overhead, which is more than TFTP. 1194 * To use sizeof in the internal unnamed structures, we need a real 1195 * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately). 1196 * The compiler doesn't complain nor allocates the actual structure 1197 */ 1198 static struct rpc_t rpc_specimen; 1199 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply)) 1200 1201 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE_NO_UDP) 1202 1203 /* 1204 * this is the packet being assembled, either data or frag control. 1205 * Fragments go by 8 bytes, so this union must be 8 bytes long 1206 */ 1207 struct hole { 1208 /* first_byte is address of this structure */ 1209 u16 last_byte; /* last byte in this hole + 1 (begin of next hole) */ 1210 u16 next_hole; /* index of next (in 8-b blocks), 0 == none */ 1211 u16 prev_hole; /* index of prev, 0 == none */ 1212 u16 unused; 1213 }; 1214 1215 static IP_t *__NetDefragment(IP_t *ip, int *lenp) 1216 { 1217 static uchar pkt_buff[IP_PKTSIZE] __attribute__((aligned(PKTALIGN))); 1218 static u16 first_hole, total_len; 1219 struct hole *payload, *thisfrag, *h, *newh; 1220 IP_t *localip = (IP_t *)pkt_buff; 1221 uchar *indata = (uchar *)ip; 1222 int offset8, start, len, done = 0; 1223 u16 ip_off = ntohs(ip->ip_off); 1224 1225 /* payload starts after IP header, this fragment is in there */ 1226 payload = (struct hole *)(pkt_buff + IP_HDR_SIZE_NO_UDP); 1227 offset8 = (ip_off & IP_OFFS); 1228 thisfrag = payload + offset8; 1229 start = offset8 * 8; 1230 len = ntohs(ip->ip_len) - IP_HDR_SIZE_NO_UDP; 1231 1232 if (start + len > IP_MAXUDP) /* fragment extends too far */ 1233 return NULL; 1234 1235 if (!total_len || localip->ip_id != ip->ip_id) { 1236 /* new (or different) packet, reset structs */ 1237 total_len = 0xffff; 1238 payload[0].last_byte = ~0; 1239 payload[0].next_hole = 0; 1240 payload[0].prev_hole = 0; 1241 first_hole = 0; 1242 /* any IP header will work, copy the first we received */ 1243 memcpy(localip, ip, IP_HDR_SIZE_NO_UDP); 1244 } 1245 1246 /* 1247 * What follows is the reassembly algorithm. We use the payload 1248 * array as a linked list of hole descriptors, as each hole starts 1249 * at a multiple of 8 bytes. However, last byte can be whatever value, 1250 * so it is represented as byte count, not as 8-byte blocks. 1251 */ 1252 1253 h = payload + first_hole; 1254 while (h->last_byte < start) { 1255 if (!h->next_hole) { 1256 /* no hole that far away */ 1257 return NULL; 1258 } 1259 h = payload + h->next_hole; 1260 } 1261 1262 /* last fragment may be 1..7 bytes, the "+7" forces acceptance */ 1263 if (offset8 + ((len + 7) / 8) <= h - payload) { 1264 /* no overlap with holes (dup fragment?) */ 1265 return NULL; 1266 } 1267 1268 if (!(ip_off & IP_FLAGS_MFRAG)) { 1269 /* no more fragmentss: truncate this (last) hole */ 1270 total_len = start + len; 1271 h->last_byte = start + len; 1272 } 1273 1274 /* 1275 * There is some overlap: fix the hole list. This code doesn't 1276 * deal with a fragment that overlaps with two different holes 1277 * (thus being a superset of a previously-received fragment). 1278 */ 1279 1280 if ((h >= thisfrag) && (h->last_byte <= start + len)) { 1281 /* complete overlap with hole: remove hole */ 1282 if (!h->prev_hole && !h->next_hole) { 1283 /* last remaining hole */ 1284 done = 1; 1285 } else if (!h->prev_hole) { 1286 /* first hole */ 1287 first_hole = h->next_hole; 1288 payload[h->next_hole].prev_hole = 0; 1289 } else if (!h->next_hole) { 1290 /* last hole */ 1291 payload[h->prev_hole].next_hole = 0; 1292 } else { 1293 /* in the middle of the list */ 1294 payload[h->next_hole].prev_hole = h->prev_hole; 1295 payload[h->prev_hole].next_hole = h->next_hole; 1296 } 1297 1298 } else if (h->last_byte <= start + len) { 1299 /* overlaps with final part of the hole: shorten this hole */ 1300 h->last_byte = start; 1301 1302 } else if (h >= thisfrag) { 1303 /* overlaps with initial part of the hole: move this hole */ 1304 newh = thisfrag + (len / 8); 1305 *newh = *h; 1306 h = newh; 1307 if (h->next_hole) 1308 payload[h->next_hole].prev_hole = (h - payload); 1309 if (h->prev_hole) 1310 payload[h->prev_hole].next_hole = (h - payload); 1311 else 1312 first_hole = (h - payload); 1313 1314 } else { 1315 /* fragment sits in the middle: split the hole */ 1316 newh = thisfrag + (len / 8); 1317 *newh = *h; 1318 h->last_byte = start; 1319 h->next_hole = (newh - payload); 1320 newh->prev_hole = (h - payload); 1321 if (newh->next_hole) 1322 payload[newh->next_hole].prev_hole = (newh - payload); 1323 } 1324 1325 /* finally copy this fragment and possibly return whole packet */ 1326 memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE_NO_UDP, len); 1327 if (!done) 1328 return NULL; 1329 1330 localip->ip_len = htons(total_len); 1331 *lenp = total_len + IP_HDR_SIZE_NO_UDP; 1332 return localip; 1333 } 1334 1335 static inline IP_t *NetDefragment(IP_t *ip, int *lenp) 1336 { 1337 u16 ip_off = ntohs(ip->ip_off); 1338 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) 1339 return ip; /* not a fragment */ 1340 return __NetDefragment(ip, lenp); 1341 } 1342 1343 #else /* !CONFIG_IP_DEFRAG */ 1344 1345 static inline IP_t *NetDefragment(IP_t *ip, int *lenp) 1346 { 1347 u16 ip_off = ntohs(ip->ip_off); 1348 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) 1349 return ip; /* not a fragment */ 1350 return NULL; 1351 } 1352 #endif 1353 1354 /** 1355 * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently 1356 * drop others. 1357 * 1358 * @parma ip IP packet containing the ICMP 1359 */ 1360 static void receive_icmp(IP_t *ip, int len, IPaddr_t src_ip, Ethernet_t *et) 1361 { 1362 ICMP_t *icmph = (ICMP_t *)&ip->udp_src; 1363 1364 switch (icmph->type) { 1365 case ICMP_REDIRECT: 1366 if (icmph->code != ICMP_REDIR_HOST) 1367 return; 1368 printf(" ICMP Host Redirect to %pI4 ", 1369 &icmph->un.gateway); 1370 break; 1371 #if defined(CONFIG_CMD_PING) 1372 case ICMP_ECHO_REPLY: 1373 /* 1374 * IP header OK. Pass the packet to the 1375 * current handler. 1376 */ 1377 /* 1378 * XXX point to ip packet - should this use 1379 * packet_icmp_handler? 1380 */ 1381 (*packetHandler)((uchar *)ip, 0, src_ip, 0, 0); 1382 break; 1383 case ICMP_ECHO_REQUEST: 1384 debug("Got ICMP ECHO REQUEST, return %d bytes\n", 1385 ETHER_HDR_SIZE + len); 1386 1387 memcpy(&et->et_dest[0], &et->et_src[0], 6); 1388 memcpy(&et->et_src[0], NetOurEther, 6); 1389 1390 ip->ip_sum = 0; 1391 ip->ip_off = 0; 1392 NetCopyIP((void *)&ip->ip_dst, &ip->ip_src); 1393 NetCopyIP((void *)&ip->ip_src, &NetOurIP); 1394 ip->ip_sum = ~NetCksum((uchar *)ip, 1395 IP_HDR_SIZE_NO_UDP >> 1); 1396 1397 icmph->type = ICMP_ECHO_REPLY; 1398 icmph->checksum = 0; 1399 icmph->checksum = ~NetCksum((uchar *)icmph, 1400 (len - IP_HDR_SIZE_NO_UDP) >> 1); 1401 (void) eth_send((uchar *)et, 1402 ETHER_HDR_SIZE + len); 1403 break; 1404 #endif 1405 default: 1406 #ifdef CONFIG_CMD_TFTPPUT 1407 if (packet_icmp_handler) 1408 packet_icmp_handler(icmph->type, icmph->code, 1409 ntohs(ip->udp_dst), src_ip, ntohs(ip->udp_src), 1410 icmph->un.data, ntohs(ip->udp_len)); 1411 #endif 1412 break; 1413 } 1414 } 1415 1416 void 1417 NetReceive(volatile uchar *inpkt, int len) 1418 { 1419 Ethernet_t *et; 1420 IP_t *ip; 1421 ARP_t *arp; 1422 IPaddr_t tmp; 1423 IPaddr_t src_ip; 1424 int x; 1425 uchar *pkt; 1426 #if defined(CONFIG_CMD_CDP) 1427 int iscdp; 1428 #endif 1429 ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid; 1430 1431 debug("packet received\n"); 1432 1433 NetRxPacket = inpkt; 1434 NetRxPacketLen = len; 1435 et = (Ethernet_t *)inpkt; 1436 1437 /* too small packet? */ 1438 if (len < ETHER_HDR_SIZE) 1439 return; 1440 1441 #ifdef CONFIG_API 1442 if (push_packet) { 1443 (*push_packet)(inpkt, len); 1444 return; 1445 } 1446 #endif 1447 1448 #if defined(CONFIG_CMD_CDP) 1449 /* keep track if packet is CDP */ 1450 iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0; 1451 #endif 1452 1453 myvlanid = ntohs(NetOurVLAN); 1454 if (myvlanid == (ushort)-1) 1455 myvlanid = VLAN_NONE; 1456 mynvlanid = ntohs(NetOurNativeVLAN); 1457 if (mynvlanid == (ushort)-1) 1458 mynvlanid = VLAN_NONE; 1459 1460 x = ntohs(et->et_protlen); 1461 1462 debug("packet received\n"); 1463 1464 if (x < 1514) { 1465 /* 1466 * Got a 802 packet. Check the other protocol field. 1467 */ 1468 x = ntohs(et->et_prot); 1469 1470 ip = (IP_t *)(inpkt + E802_HDR_SIZE); 1471 len -= E802_HDR_SIZE; 1472 1473 } else if (x != PROT_VLAN) { /* normal packet */ 1474 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE); 1475 len -= ETHER_HDR_SIZE; 1476 1477 } else { /* VLAN packet */ 1478 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et; 1479 1480 debug("VLAN packet received\n"); 1481 1482 /* too small packet? */ 1483 if (len < VLAN_ETHER_HDR_SIZE) 1484 return; 1485 1486 /* if no VLAN active */ 1487 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE 1488 #if defined(CONFIG_CMD_CDP) 1489 && iscdp == 0 1490 #endif 1491 ) 1492 return; 1493 1494 cti = ntohs(vet->vet_tag); 1495 vlanid = cti & VLAN_IDMASK; 1496 x = ntohs(vet->vet_type); 1497 1498 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE); 1499 len -= VLAN_ETHER_HDR_SIZE; 1500 } 1501 1502 debug("Receive from protocol 0x%x\n", x); 1503 1504 #if defined(CONFIG_CMD_CDP) 1505 if (iscdp) { 1506 CDPHandler((uchar *)ip, len); 1507 return; 1508 } 1509 #endif 1510 1511 if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) { 1512 if (vlanid == VLAN_NONE) 1513 vlanid = (mynvlanid & VLAN_IDMASK); 1514 /* not matched? */ 1515 if (vlanid != (myvlanid & VLAN_IDMASK)) 1516 return; 1517 } 1518 1519 switch (x) { 1520 1521 case PROT_ARP: 1522 /* 1523 * We have to deal with two types of ARP packets: 1524 * - REQUEST packets will be answered by sending our 1525 * IP address - if we know it. 1526 * - REPLY packates are expected only after we asked 1527 * for the TFTP server's or the gateway's ethernet 1528 * address; so if we receive such a packet, we set 1529 * the server ethernet address 1530 */ 1531 debug("Got ARP\n"); 1532 1533 arp = (ARP_t *)ip; 1534 if (len < ARP_HDR_SIZE) { 1535 printf("bad length %d < %d\n", len, ARP_HDR_SIZE); 1536 return; 1537 } 1538 if (ntohs(arp->ar_hrd) != ARP_ETHER) 1539 return; 1540 if (ntohs(arp->ar_pro) != PROT_IP) 1541 return; 1542 if (arp->ar_hln != 6) 1543 return; 1544 if (arp->ar_pln != 4) 1545 return; 1546 1547 if (NetOurIP == 0) 1548 return; 1549 1550 if (NetReadIP(&arp->ar_data[16]) != NetOurIP) 1551 return; 1552 1553 switch (ntohs(arp->ar_op)) { 1554 case ARPOP_REQUEST: 1555 /* reply with our IP address */ 1556 debug("Got ARP REQUEST, return our IP\n"); 1557 pkt = (uchar *)et; 1558 pkt += NetSetEther(pkt, et->et_src, PROT_ARP); 1559 arp->ar_op = htons(ARPOP_REPLY); 1560 memcpy(&arp->ar_data[10], &arp->ar_data[0], 6); 1561 NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]); 1562 memcpy(&arp->ar_data[0], NetOurEther, 6); 1563 NetCopyIP(&arp->ar_data[6], &NetOurIP); 1564 (void) eth_send((uchar *)et, 1565 (pkt - (uchar *)et) + ARP_HDR_SIZE); 1566 return; 1567 1568 case ARPOP_REPLY: /* arp reply */ 1569 /* are we waiting for a reply */ 1570 if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC) 1571 break; 1572 1573 #ifdef CONFIG_KEEP_SERVERADDR 1574 if (NetServerIP == NetArpWaitPacketIP) { 1575 char buf[20]; 1576 sprintf(buf, "%pM", arp->ar_data); 1577 setenv("serveraddr", buf); 1578 } 1579 #endif 1580 1581 debug("Got ARP REPLY, set server/gtwy eth addr (%pM)\n", 1582 arp->ar_data); 1583 1584 tmp = NetReadIP(&arp->ar_data[6]); 1585 1586 /* matched waiting packet's address */ 1587 if (tmp == NetArpWaitReplyIP) { 1588 debug("Got it\n"); 1589 /* save address for later use */ 1590 memcpy(NetArpWaitPacketMAC, 1591 &arp->ar_data[0], 6); 1592 1593 #ifdef CONFIG_NETCONSOLE 1594 (*packetHandler)(0, 0, 0, 0, 0); 1595 #endif 1596 /* modify header, and transmit it */ 1597 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6); 1598 (void) eth_send(NetArpWaitTxPacket, 1599 NetArpWaitTxPacketSize); 1600 1601 /* no arp request pending now */ 1602 NetArpWaitPacketIP = 0; 1603 NetArpWaitTxPacketSize = 0; 1604 NetArpWaitPacketMAC = NULL; 1605 1606 } 1607 return; 1608 default: 1609 debug("Unexpected ARP opcode 0x%x\n", 1610 ntohs(arp->ar_op)); 1611 return; 1612 } 1613 break; 1614 1615 #ifdef CONFIG_CMD_RARP 1616 case PROT_RARP: 1617 debug("Got RARP\n"); 1618 arp = (ARP_t *)ip; 1619 if (len < ARP_HDR_SIZE) { 1620 printf("bad length %d < %d\n", len, ARP_HDR_SIZE); 1621 return; 1622 } 1623 1624 if ((ntohs(arp->ar_op) != RARPOP_REPLY) || 1625 (ntohs(arp->ar_hrd) != ARP_ETHER) || 1626 (ntohs(arp->ar_pro) != PROT_IP) || 1627 (arp->ar_hln != 6) || (arp->ar_pln != 4)) { 1628 1629 puts("invalid RARP header\n"); 1630 } else { 1631 NetCopyIP(&NetOurIP, &arp->ar_data[16]); 1632 if (NetServerIP == 0) 1633 NetCopyIP(&NetServerIP, &arp->ar_data[6]); 1634 memcpy(NetServerEther, &arp->ar_data[0], 6); 1635 1636 (*packetHandler)(0, 0, 0, 0, 0); 1637 } 1638 break; 1639 #endif 1640 case PROT_IP: 1641 debug("Got IP\n"); 1642 /* Before we start poking the header, make sure it is there */ 1643 if (len < IP_HDR_SIZE) { 1644 debug("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE); 1645 return; 1646 } 1647 /* Check the packet length */ 1648 if (len < ntohs(ip->ip_len)) { 1649 printf("len bad %d < %d\n", len, ntohs(ip->ip_len)); 1650 return; 1651 } 1652 len = ntohs(ip->ip_len); 1653 debug("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff); 1654 1655 /* Can't deal with anything except IPv4 */ 1656 if ((ip->ip_hl_v & 0xf0) != 0x40) 1657 return; 1658 /* Can't deal with IP options (headers != 20 bytes) */ 1659 if ((ip->ip_hl_v & 0x0f) > 0x05) 1660 return; 1661 /* Check the Checksum of the header */ 1662 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) { 1663 puts("checksum bad\n"); 1664 return; 1665 } 1666 /* If it is not for us, ignore it */ 1667 tmp = NetReadIP(&ip->ip_dst); 1668 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) { 1669 #ifdef CONFIG_MCAST_TFTP 1670 if (Mcast_addr != tmp) 1671 #endif 1672 return; 1673 } 1674 /* Read source IP address for later use */ 1675 src_ip = NetReadIP(&ip->ip_src); 1676 /* 1677 * The function returns the unchanged packet if it's not 1678 * a fragment, and either the complete packet or NULL if 1679 * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL) 1680 */ 1681 ip = NetDefragment(ip, &len); 1682 if (!ip) 1683 return; 1684 /* 1685 * watch for ICMP host redirects 1686 * 1687 * There is no real handler code (yet). We just watch 1688 * for ICMP host redirect messages. In case anybody 1689 * sees these messages: please contact me 1690 * (wd@denx.de), or - even better - send me the 1691 * necessary fixes :-) 1692 * 1693 * Note: in all cases where I have seen this so far 1694 * it was a problem with the router configuration, 1695 * for instance when a router was configured in the 1696 * BOOTP reply, but the TFTP server was on the same 1697 * subnet. So this is probably a warning that your 1698 * configuration might be wrong. But I'm not really 1699 * sure if there aren't any other situations. 1700 * 1701 * Simon Glass <sjg@chromium.org>: We get an ICMP when 1702 * we send a tftp packet to a dead connection, or when 1703 * there is no server at the other end. 1704 */ 1705 if (ip->ip_p == IPPROTO_ICMP) { 1706 receive_icmp(ip, len, src_ip, et); 1707 return; 1708 } else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */ 1709 return; 1710 } 1711 1712 #ifdef CONFIG_UDP_CHECKSUM 1713 if (ip->udp_xsum != 0) { 1714 ulong xsum; 1715 ushort *sumptr; 1716 ushort sumlen; 1717 1718 xsum = ip->ip_p; 1719 xsum += (ntohs(ip->udp_len)); 1720 xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff; 1721 xsum += (ntohl(ip->ip_src) >> 0) & 0x0000ffff; 1722 xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff; 1723 xsum += (ntohl(ip->ip_dst) >> 0) & 0x0000ffff; 1724 1725 sumlen = ntohs(ip->udp_len); 1726 sumptr = (ushort *) &(ip->udp_src); 1727 1728 while (sumlen > 1) { 1729 ushort sumdata; 1730 1731 sumdata = *sumptr++; 1732 xsum += ntohs(sumdata); 1733 sumlen -= 2; 1734 } 1735 if (sumlen > 0) { 1736 ushort sumdata; 1737 1738 sumdata = *(unsigned char *) sumptr; 1739 sumdata = (sumdata << 8) & 0xff00; 1740 xsum += sumdata; 1741 } 1742 while ((xsum >> 16) != 0) { 1743 xsum = (xsum & 0x0000ffff) + 1744 ((xsum >> 16) & 0x0000ffff); 1745 } 1746 if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) { 1747 printf(" UDP wrong checksum %08lx %08x\n", 1748 xsum, ntohs(ip->udp_xsum)); 1749 return; 1750 } 1751 } 1752 #endif 1753 1754 1755 #ifdef CONFIG_NETCONSOLE 1756 nc_input_packet((uchar *)ip + IP_HDR_SIZE, 1757 ntohs(ip->udp_dst), 1758 ntohs(ip->udp_src), 1759 ntohs(ip->udp_len) - 8); 1760 #endif 1761 /* 1762 * IP header OK. Pass the packet to the current handler. 1763 */ 1764 (*packetHandler)((uchar *)ip + IP_HDR_SIZE, 1765 ntohs(ip->udp_dst), 1766 src_ip, 1767 ntohs(ip->udp_src), 1768 ntohs(ip->udp_len) - 8); 1769 break; 1770 } 1771 } 1772 1773 1774 /**********************************************************************/ 1775 1776 static int net_check_prereq(enum proto_t protocol) 1777 { 1778 switch (protocol) { 1779 /* Fall through */ 1780 #if defined(CONFIG_CMD_PING) 1781 case PING: 1782 if (NetPingIP == 0) { 1783 puts("*** ERROR: ping address not given\n"); 1784 return 1; 1785 } 1786 goto common; 1787 #endif 1788 #if defined(CONFIG_CMD_SNTP) 1789 case SNTP: 1790 if (NetNtpServerIP == 0) { 1791 puts("*** ERROR: NTP server address not given\n"); 1792 return 1; 1793 } 1794 goto common; 1795 #endif 1796 #if defined(CONFIG_CMD_DNS) 1797 case DNS: 1798 if (NetOurDNSIP == 0) { 1799 puts("*** ERROR: DNS server address not given\n"); 1800 return 1; 1801 } 1802 goto common; 1803 #endif 1804 #if defined(CONFIG_CMD_NFS) 1805 case NFS: 1806 #endif 1807 case TFTPGET: 1808 case TFTPPUT: 1809 if (NetServerIP == 0) { 1810 puts("*** ERROR: `serverip' not set\n"); 1811 return 1; 1812 } 1813 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \ 1814 defined(CONFIG_CMD_DNS) 1815 common: 1816 #endif 1817 /* Fall through */ 1818 1819 case NETCONS: 1820 case TFTPSRV: 1821 if (NetOurIP == 0) { 1822 puts("*** ERROR: `ipaddr' not set\n"); 1823 return 1; 1824 } 1825 /* Fall through */ 1826 1827 #ifdef CONFIG_CMD_RARP 1828 case RARP: 1829 #endif 1830 case BOOTP: 1831 case CDP: 1832 case DHCP: 1833 if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) { 1834 extern int eth_get_dev_index(void); 1835 int num = eth_get_dev_index(); 1836 1837 switch (num) { 1838 case -1: 1839 puts("*** ERROR: No ethernet found.\n"); 1840 return 1; 1841 case 0: 1842 puts("*** ERROR: `ethaddr' not set\n"); 1843 break; 1844 default: 1845 printf("*** ERROR: `eth%daddr' not set\n", 1846 num); 1847 break; 1848 } 1849 1850 NetStartAgain(); 1851 return 2; 1852 } 1853 /* Fall through */ 1854 default: 1855 return 0; 1856 } 1857 return 0; /* OK */ 1858 } 1859 /**********************************************************************/ 1860 1861 int 1862 NetCksumOk(uchar *ptr, int len) 1863 { 1864 return !((NetCksum(ptr, len) + 1) & 0xfffe); 1865 } 1866 1867 1868 unsigned 1869 NetCksum(uchar *ptr, int len) 1870 { 1871 ulong xsum; 1872 ushort *p = (ushort *)ptr; 1873 1874 xsum = 0; 1875 while (len-- > 0) 1876 xsum += *p++; 1877 xsum = (xsum & 0xffff) + (xsum >> 16); 1878 xsum = (xsum & 0xffff) + (xsum >> 16); 1879 return xsum & 0xffff; 1880 } 1881 1882 int 1883 NetEthHdrSize(void) 1884 { 1885 ushort myvlanid; 1886 1887 myvlanid = ntohs(NetOurVLAN); 1888 if (myvlanid == (ushort)-1) 1889 myvlanid = VLAN_NONE; 1890 1891 return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : 1892 VLAN_ETHER_HDR_SIZE; 1893 } 1894 1895 int 1896 NetSetEther(volatile uchar *xet, uchar * addr, uint prot) 1897 { 1898 Ethernet_t *et = (Ethernet_t *)xet; 1899 ushort myvlanid; 1900 1901 myvlanid = ntohs(NetOurVLAN); 1902 if (myvlanid == (ushort)-1) 1903 myvlanid = VLAN_NONE; 1904 1905 memcpy(et->et_dest, addr, 6); 1906 memcpy(et->et_src, NetOurEther, 6); 1907 if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) { 1908 et->et_protlen = htons(prot); 1909 return ETHER_HDR_SIZE; 1910 } else { 1911 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet; 1912 1913 vet->vet_vlan_type = htons(PROT_VLAN); 1914 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK)); 1915 vet->vet_type = htons(prot); 1916 return VLAN_ETHER_HDR_SIZE; 1917 } 1918 } 1919 1920 void 1921 NetSetIP(volatile uchar *xip, IPaddr_t dest, int dport, int sport, int len) 1922 { 1923 IP_t *ip = (IP_t *)xip; 1924 1925 /* 1926 * If the data is an odd number of bytes, zero the 1927 * byte after the last byte so that the checksum 1928 * will work. 1929 */ 1930 if (len & 1) 1931 xip[IP_HDR_SIZE + len] = 0; 1932 1933 /* 1934 * Construct an IP and UDP header. 1935 * (need to set no fragment bit - XXX) 1936 */ 1937 /* IP_HDR_SIZE / 4 (not including UDP) */ 1938 ip->ip_hl_v = 0x45; 1939 ip->ip_tos = 0; 1940 ip->ip_len = htons(IP_HDR_SIZE + len); 1941 ip->ip_id = htons(NetIPID++); 1942 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ 1943 ip->ip_ttl = 255; 1944 ip->ip_p = 17; /* UDP */ 1945 ip->ip_sum = 0; 1946 /* already in network byte order */ 1947 NetCopyIP((void *)&ip->ip_src, &NetOurIP); 1948 /* - "" - */ 1949 NetCopyIP((void *)&ip->ip_dst, &dest); 1950 ip->udp_src = htons(sport); 1951 ip->udp_dst = htons(dport); 1952 ip->udp_len = htons(8 + len); 1953 ip->udp_xsum = 0; 1954 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2); 1955 } 1956 1957 void copy_filename(char *dst, const char *src, int size) 1958 { 1959 if (*src && (*src == '"')) { 1960 ++src; 1961 --size; 1962 } 1963 1964 while ((--size > 0) && *src && (*src != '"')) 1965 *dst++ = *src++; 1966 *dst = '\0'; 1967 } 1968 1969 #if defined(CONFIG_CMD_NFS) || \ 1970 defined(CONFIG_CMD_SNTP) || \ 1971 defined(CONFIG_CMD_DNS) 1972 /* 1973 * make port a little random (1024-17407) 1974 * This keeps the math somewhat trivial to compute, and seems to work with 1975 * all supported protocols/clients/servers 1976 */ 1977 unsigned int random_port(void) 1978 { 1979 return 1024 + (get_timer(0) % 0x4000); 1980 } 1981 #endif 1982 1983 void ip_to_string(IPaddr_t x, char *s) 1984 { 1985 x = ntohl(x); 1986 sprintf(s, "%d.%d.%d.%d", 1987 (int) ((x >> 24) & 0xff), 1988 (int) ((x >> 16) & 0xff), 1989 (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff) 1990 ); 1991 } 1992 1993 void VLAN_to_string(ushort x, char *s) 1994 { 1995 x = ntohs(x); 1996 1997 if (x == (ushort)-1) 1998 x = VLAN_NONE; 1999 2000 if (x == VLAN_NONE) 2001 strcpy(s, "none"); 2002 else 2003 sprintf(s, "%d", x & VLAN_IDMASK); 2004 } 2005 2006 ushort string_to_VLAN(const char *s) 2007 { 2008 ushort id; 2009 2010 if (s == NULL) 2011 return htons(VLAN_NONE); 2012 2013 if (*s < '0' || *s > '9') 2014 id = VLAN_NONE; 2015 else 2016 id = (ushort)simple_strtoul(s, NULL, 10); 2017 2018 return htons(id); 2019 } 2020 2021 ushort getenv_VLAN(char *var) 2022 { 2023 return string_to_VLAN(getenv(var)); 2024 } 2025