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 volatile uchar *pkt; 250 ARP_t *arp; 251 252 debug("ARP broadcast %d\n", NetArpWaitTry); 253 254 pkt = NetTxPacket; 255 256 pkt += NetSetEther(pkt, NetBcastAddr, PROT_ARP); 257 258 arp = (ARP_t *) pkt; 259 260 arp->ar_hrd = htons(ARP_ETHER); 261 arp->ar_pro = htons(PROT_IP); 262 arp->ar_hln = 6; 263 arp->ar_pln = 4; 264 arp->ar_op = htons(ARPOP_REQUEST); 265 266 /* source ET addr */ 267 memcpy(&arp->ar_data[0], NetOurEther, 6); 268 /* source IP addr */ 269 NetWriteIP((uchar *) &arp->ar_data[6], NetOurIP); 270 /* dest ET addr = 0 */ 271 memset(&arp->ar_data[10], '\0', 6); 272 if ((NetArpWaitPacketIP & NetOurSubnetMask) != 273 (NetOurIP & NetOurSubnetMask)) { 274 if (NetOurGatewayIP == 0) { 275 puts("## Warning: gatewayip needed but not set\n"); 276 NetArpWaitReplyIP = NetArpWaitPacketIP; 277 } else { 278 NetArpWaitReplyIP = NetOurGatewayIP; 279 } 280 } else { 281 NetArpWaitReplyIP = NetArpWaitPacketIP; 282 } 283 284 NetWriteIP((uchar *) &arp->ar_data[16], NetArpWaitReplyIP); 285 (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE); 286 } 287 288 void ArpTimeoutCheck(void) 289 { 290 ulong t; 291 292 if (!NetArpWaitPacketIP) 293 return; 294 295 t = get_timer(0); 296 297 /* check for arp timeout */ 298 if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT) { 299 NetArpWaitTry++; 300 301 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) { 302 puts("\nARP Retry count exceeded; starting again\n"); 303 NetArpWaitTry = 0; 304 NetStartAgain(); 305 } else { 306 NetArpWaitTimerStart = t; 307 ArpRequest(); 308 } 309 } 310 } 311 312 static void NetInitLoop(enum proto_t protocol) 313 { 314 static int env_changed_id; 315 bd_t *bd = gd->bd; 316 int env_id = get_env_id(); 317 318 /* update only when the environment has changed */ 319 if (env_changed_id != env_id) { 320 NetOurIP = getenv_IPaddr("ipaddr"); 321 NetCopyIP(&bd->bi_ip_addr, &NetOurIP); 322 NetOurGatewayIP = getenv_IPaddr("gatewayip"); 323 NetOurSubnetMask = getenv_IPaddr("netmask"); 324 NetServerIP = getenv_IPaddr("serverip"); 325 NetOurNativeVLAN = getenv_VLAN("nvlan"); 326 NetOurVLAN = getenv_VLAN("vlan"); 327 #if defined(CONFIG_CMD_DNS) 328 NetOurDNSIP = getenv_IPaddr("dnsip"); 329 #endif 330 env_changed_id = env_id; 331 } 332 333 return; 334 } 335 336 /**********************************************************************/ 337 /* 338 * Main network processing loop. 339 */ 340 341 int NetLoop(enum proto_t protocol) 342 { 343 bd_t *bd = gd->bd; 344 int ret = -1; 345 346 NetRestarted = 0; 347 NetDevExists = 0; 348 349 /* XXX problem with bss workaround */ 350 NetArpWaitPacketMAC = NULL; 351 NetArpWaitTxPacket = NULL; 352 NetArpWaitPacketIP = 0; 353 NetArpWaitReplyIP = 0; 354 NetArpWaitTxPacket = NULL; 355 NetTxPacket = NULL; 356 NetTryCount = 1; 357 358 if (!NetTxPacket) { 359 int i; 360 /* 361 * Setup packet buffers, aligned correctly. 362 */ 363 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1); 364 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN; 365 for (i = 0; i < PKTBUFSRX; i++) 366 NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN; 367 } 368 369 if (!NetArpWaitTxPacket) { 370 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1); 371 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN; 372 NetArpWaitTxPacketSize = 0; 373 } 374 375 eth_halt(); 376 eth_set_current(); 377 if (eth_init(bd) < 0) { 378 eth_halt(); 379 return -1; 380 } 381 382 restart: 383 memcpy(NetOurEther, eth_get_dev()->enetaddr, 6); 384 385 NetState = NETLOOP_CONTINUE; 386 387 /* 388 * Start the ball rolling with the given start function. From 389 * here on, this code is a state machine driven by received 390 * packets and timer events. 391 */ 392 NetInitLoop(protocol); 393 394 switch (net_check_prereq(protocol)) { 395 case 1: 396 /* network not configured */ 397 eth_halt(); 398 return -1; 399 400 case 2: 401 /* network device not configured */ 402 break; 403 404 case 0: 405 NetDevExists = 1; 406 NetBootFileXferSize = 0; 407 switch (protocol) { 408 case TFTPGET: 409 #ifdef CONFIG_CMD_TFTPPUT 410 case TFTPPUT: 411 #endif 412 /* always use ARP to get server ethernet address */ 413 TftpStart(protocol); 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 break; 476 } 477 478 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 479 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ 480 defined(CONFIG_STATUS_LED) && \ 481 defined(STATUS_LED_RED) 482 /* 483 * Echo the inverted link state to the fault LED. 484 */ 485 if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) 486 status_led_set(STATUS_LED_RED, STATUS_LED_OFF); 487 else 488 status_led_set(STATUS_LED_RED, STATUS_LED_ON); 489 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 490 #endif /* CONFIG_MII, ... */ 491 492 /* 493 * Main packet reception loop. Loop receiving packets until 494 * someone sets `NetState' to a state that terminates. 495 */ 496 for (;;) { 497 WATCHDOG_RESET(); 498 #ifdef CONFIG_SHOW_ACTIVITY 499 { 500 extern void show_activity(int arg); 501 show_activity(1); 502 } 503 #endif 504 /* 505 * Check the ethernet for a new packet. The ethernet 506 * receive routine will process it. 507 */ 508 eth_rx(); 509 510 /* 511 * Abort if ctrl-c was pressed. 512 */ 513 if (ctrlc()) { 514 eth_halt(); 515 puts("\nAbort\n"); 516 goto done; 517 } 518 519 ArpTimeoutCheck(); 520 521 /* 522 * Check for a timeout, and run the timeout handler 523 * if we have one. 524 */ 525 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) { 526 thand_f *x; 527 528 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 529 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ 530 defined(CONFIG_STATUS_LED) && \ 531 defined(STATUS_LED_RED) 532 /* 533 * Echo the inverted link state to the fault LED. 534 */ 535 if (miiphy_link(eth_get_dev()->name, 536 CONFIG_SYS_FAULT_MII_ADDR)) { 537 status_led_set(STATUS_LED_RED, STATUS_LED_OFF); 538 } else { 539 status_led_set(STATUS_LED_RED, STATUS_LED_ON); 540 } 541 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 542 #endif /* CONFIG_MII, ... */ 543 x = timeHandler; 544 timeHandler = (thand_f *)0; 545 (*x)(); 546 } 547 548 549 switch (NetState) { 550 551 case NETLOOP_RESTART: 552 NetRestarted = 1; 553 goto restart; 554 555 case NETLOOP_SUCCESS: 556 if (NetBootFileXferSize > 0) { 557 char buf[20]; 558 printf("Bytes transferred = %ld (%lx hex)\n", 559 NetBootFileXferSize, 560 NetBootFileXferSize); 561 sprintf(buf, "%lX", NetBootFileXferSize); 562 setenv("filesize", buf); 563 564 sprintf(buf, "%lX", (unsigned long)load_addr); 565 setenv("fileaddr", buf); 566 } 567 eth_halt(); 568 ret = NetBootFileXferSize; 569 goto done; 570 571 case NETLOOP_FAIL: 572 goto done; 573 } 574 } 575 576 done: 577 #ifdef CONFIG_CMD_TFTPPUT 578 /* Clear out the handlers */ 579 NetSetHandler(NULL); 580 net_set_icmp_handler(NULL); 581 #endif 582 return ret; 583 } 584 585 /**********************************************************************/ 586 587 static void 588 startAgainTimeout(void) 589 { 590 NetState = NETLOOP_RESTART; 591 } 592 593 static void 594 startAgainHandler(uchar *pkt, unsigned dest, IPaddr_t sip, 595 unsigned src, unsigned len) 596 { 597 /* Totally ignore the packet */ 598 } 599 600 void NetStartAgain(void) 601 { 602 char *nretry; 603 int retry_forever = 0; 604 unsigned long retrycnt = 0; 605 606 nretry = getenv("netretry"); 607 if (nretry) { 608 if (!strcmp(nretry, "yes")) 609 retry_forever = 1; 610 else if (!strcmp(nretry, "no")) 611 retrycnt = 0; 612 else if (!strcmp(nretry, "once")) 613 retrycnt = 1; 614 else 615 retrycnt = simple_strtoul(nretry, NULL, 0); 616 } else 617 retry_forever = 1; 618 619 if ((!retry_forever) && (NetTryCount >= retrycnt)) { 620 eth_halt(); 621 NetState = NETLOOP_FAIL; 622 return; 623 } 624 625 NetTryCount++; 626 627 eth_halt(); 628 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER) 629 eth_try_another(!NetRestarted); 630 #endif 631 eth_init(gd->bd); 632 if (NetRestartWrap) { 633 NetRestartWrap = 0; 634 if (NetDevExists) { 635 NetSetTimeout(10000UL, startAgainTimeout); 636 NetSetHandler(startAgainHandler); 637 } else { 638 NetState = NETLOOP_FAIL; 639 } 640 } else { 641 NetState = NETLOOP_RESTART; 642 } 643 } 644 645 /**********************************************************************/ 646 /* 647 * Miscelaneous bits. 648 */ 649 650 void 651 NetSetHandler(rxhand_f *f) 652 { 653 packetHandler = f; 654 } 655 656 #ifdef CONFIG_CMD_TFTPPUT 657 void net_set_icmp_handler(rxhand_icmp_f *f) 658 { 659 packet_icmp_handler = f; 660 } 661 #endif 662 663 void 664 NetSetTimeout(ulong iv, thand_f *f) 665 { 666 if (iv == 0) { 667 timeHandler = (thand_f *)0; 668 } else { 669 timeHandler = f; 670 timeStart = get_timer(0); 671 timeDelta = iv; 672 } 673 } 674 675 676 void 677 NetSendPacket(volatile uchar *pkt, int len) 678 { 679 (void) eth_send(pkt, len); 680 } 681 682 int 683 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len) 684 { 685 uchar *pkt; 686 687 /* convert to new style broadcast */ 688 if (dest == 0) 689 dest = 0xFFFFFFFF; 690 691 /* if broadcast, make the ether address a broadcast and don't do ARP */ 692 if (dest == 0xFFFFFFFF) 693 ether = NetBcastAddr; 694 695 /* 696 * if MAC address was not discovered yet, save the packet and do 697 * an ARP request 698 */ 699 if (memcmp(ether, NetEtherNullAddr, 6) == 0) { 700 701 debug("sending ARP for %08lx\n", dest); 702 703 NetArpWaitPacketIP = dest; 704 NetArpWaitPacketMAC = ether; 705 706 pkt = NetArpWaitTxPacket; 707 pkt += NetSetEther(pkt, NetArpWaitPacketMAC, PROT_IP); 708 709 NetSetIP(pkt, dest, dport, sport, len); 710 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + 711 (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len); 712 713 /* size of the waiting packet */ 714 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + 715 IP_HDR_SIZE + len; 716 717 /* and do the ARP request */ 718 NetArpWaitTry = 1; 719 NetArpWaitTimerStart = get_timer(0); 720 ArpRequest(); 721 return 1; /* waiting */ 722 } 723 724 debug("sending UDP to %08lx/%pM\n", dest, ether); 725 726 pkt = (uchar *)NetTxPacket; 727 pkt += NetSetEther(pkt, ether, PROT_IP); 728 NetSetIP(pkt, dest, dport, sport, len); 729 (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len); 730 731 return 0; /* transmitted */ 732 } 733 734 #if defined(CONFIG_CMD_PING) 735 static ushort PingSeqNo; 736 737 int PingSend(void) 738 { 739 static uchar mac[6]; 740 volatile IP_t *ip; 741 volatile ushort *s; 742 uchar *pkt; 743 744 /* XXX always send arp request */ 745 746 memcpy(mac, NetEtherNullAddr, 6); 747 748 debug("sending ARP for %08lx\n", NetPingIP); 749 750 NetArpWaitPacketIP = NetPingIP; 751 NetArpWaitPacketMAC = mac; 752 753 pkt = NetArpWaitTxPacket; 754 pkt += NetSetEther(pkt, mac, PROT_IP); 755 756 ip = (volatile IP_t *)pkt; 757 758 /* 759 * Construct an IP and ICMP header. 760 * (need to set no fragment bit - XXX) 761 */ 762 /* IP_HDR_SIZE / 4 (not including UDP) */ 763 ip->ip_hl_v = 0x45; 764 ip->ip_tos = 0; 765 ip->ip_len = htons(IP_HDR_SIZE_NO_UDP + 8); 766 ip->ip_id = htons(NetIPID++); 767 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ 768 ip->ip_ttl = 255; 769 ip->ip_p = 0x01; /* ICMP */ 770 ip->ip_sum = 0; 771 /* already in network byte order */ 772 NetCopyIP((void *)&ip->ip_src, &NetOurIP); 773 /* - "" - */ 774 NetCopyIP((void *)&ip->ip_dst, &NetPingIP); 775 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2); 776 777 s = &ip->udp_src; /* XXX ICMP starts here */ 778 s[0] = htons(0x0800); /* echo-request, code */ 779 s[1] = 0; /* checksum */ 780 s[2] = 0; /* identifier */ 781 s[3] = htons(PingSeqNo++); /* sequence number */ 782 s[1] = ~NetCksum((uchar *)s, 8/2); 783 784 /* size of the waiting packet */ 785 NetArpWaitTxPacketSize = 786 (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8; 787 788 /* and do the ARP request */ 789 NetArpWaitTry = 1; 790 NetArpWaitTimerStart = get_timer(0); 791 ArpRequest(); 792 return 1; /* waiting */ 793 } 794 795 static void 796 PingTimeout(void) 797 { 798 eth_halt(); 799 NetState = NETLOOP_FAIL; /* we did not get the reply */ 800 } 801 802 static void 803 PingHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 804 unsigned len) 805 { 806 if (sip != NetPingIP) 807 return; 808 809 NetState = NETLOOP_SUCCESS; 810 } 811 812 static void PingStart(void) 813 { 814 printf("Using %s device\n", eth_get_name()); 815 NetSetTimeout(10000UL, PingTimeout); 816 NetSetHandler(PingHandler); 817 818 PingSend(); 819 } 820 #endif 821 822 #if defined(CONFIG_CMD_CDP) 823 824 #define CDP_DEVICE_ID_TLV 0x0001 825 #define CDP_ADDRESS_TLV 0x0002 826 #define CDP_PORT_ID_TLV 0x0003 827 #define CDP_CAPABILITIES_TLV 0x0004 828 #define CDP_VERSION_TLV 0x0005 829 #define CDP_PLATFORM_TLV 0x0006 830 #define CDP_NATIVE_VLAN_TLV 0x000a 831 #define CDP_APPLIANCE_VLAN_TLV 0x000e 832 #define CDP_TRIGGER_TLV 0x000f 833 #define CDP_POWER_CONSUMPTION_TLV 0x0010 834 #define CDP_SYSNAME_TLV 0x0014 835 #define CDP_SYSOBJECT_TLV 0x0015 836 #define CDP_MANAGEMENT_ADDRESS_TLV 0x0016 837 838 #define CDP_TIMEOUT 250UL /* one packet every 250ms */ 839 840 static int CDPSeq; 841 static int CDPOK; 842 843 ushort CDPNativeVLAN; 844 ushort CDPApplianceVLAN; 845 846 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 847 0x00 }; 848 849 static ushort CDP_compute_csum(const uchar *buff, ushort len) 850 { 851 ushort csum; 852 int odd; 853 ulong result = 0; 854 ushort leftover; 855 ushort *p; 856 857 if (len > 0) { 858 odd = 1 & (ulong)buff; 859 if (odd) { 860 result = *buff << 8; 861 len--; 862 buff++; 863 } 864 while (len > 1) { 865 p = (ushort *)buff; 866 result += *p++; 867 buff = (uchar *)p; 868 if (result & 0x80000000) 869 result = (result & 0xFFFF) + (result >> 16); 870 len -= 2; 871 } 872 if (len) { 873 leftover = (signed short)(*(const signed char *)buff); 874 /* CISCO SUCKS big time! (and blows too): 875 * CDP uses the IP checksum algorithm with a twist; 876 * for the last byte it *sign* extends and sums. 877 */ 878 result = (result & 0xffff0000) | 879 ((result + leftover) & 0x0000ffff); 880 } 881 while (result >> 16) 882 result = (result & 0xFFFF) + (result >> 16); 883 884 if (odd) 885 result = ((result >> 8) & 0xff) | 886 ((result & 0xff) << 8); 887 } 888 889 /* add up 16-bit and 17-bit words for 17+c bits */ 890 result = (result & 0xffff) + (result >> 16); 891 /* add up 16-bit and 2-bit for 16+c bit */ 892 result = (result & 0xffff) + (result >> 16); 893 /* add up carry.. */ 894 result = (result & 0xffff) + (result >> 16); 895 896 /* negate */ 897 csum = ~(ushort)result; 898 899 /* run time endian detection */ 900 if (csum != htons(csum)) /* little endian */ 901 csum = htons(csum); 902 903 return csum; 904 } 905 906 int CDPSendTrigger(void) 907 { 908 volatile uchar *pkt; 909 volatile ushort *s; 910 volatile ushort *cp; 911 Ethernet_t *et; 912 int len; 913 ushort chksum; 914 #if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID) || \ 915 defined(CONFIG_CDP_VERSION) || defined(CONFIG_CDP_PLATFORM) 916 char buf[32]; 917 #endif 918 919 pkt = NetTxPacket; 920 et = (Ethernet_t *)pkt; 921 922 /* NOTE: trigger sent not on any VLAN */ 923 924 /* form ethernet header */ 925 memcpy(et->et_dest, NetCDPAddr, 6); 926 memcpy(et->et_src, NetOurEther, 6); 927 928 pkt += ETHER_HDR_SIZE; 929 930 /* SNAP header */ 931 memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)); 932 pkt += sizeof(CDP_SNAP_hdr); 933 934 /* CDP header */ 935 *pkt++ = 0x02; /* CDP version 2 */ 936 *pkt++ = 180; /* TTL */ 937 s = (volatile ushort *)pkt; 938 cp = s; 939 /* checksum (0 for later calculation) */ 940 *s++ = htons(0); 941 942 /* CDP fields */ 943 #ifdef CONFIG_CDP_DEVICE_ID 944 *s++ = htons(CDP_DEVICE_ID_TLV); 945 *s++ = htons(CONFIG_CDP_DEVICE_ID); 946 sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%pm", NetOurEther); 947 memcpy((uchar *)s, buf, 16); 948 s += 16 / 2; 949 #endif 950 951 #ifdef CONFIG_CDP_PORT_ID 952 *s++ = htons(CDP_PORT_ID_TLV); 953 memset(buf, 0, sizeof(buf)); 954 sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index()); 955 len = strlen(buf); 956 if (len & 1) /* make it even */ 957 len++; 958 *s++ = htons(len + 4); 959 memcpy((uchar *)s, buf, len); 960 s += len / 2; 961 #endif 962 963 #ifdef CONFIG_CDP_CAPABILITIES 964 *s++ = htons(CDP_CAPABILITIES_TLV); 965 *s++ = htons(8); 966 *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES); 967 s += 2; 968 #endif 969 970 #ifdef CONFIG_CDP_VERSION 971 *s++ = htons(CDP_VERSION_TLV); 972 memset(buf, 0, sizeof(buf)); 973 strcpy(buf, CONFIG_CDP_VERSION); 974 len = strlen(buf); 975 if (len & 1) /* make it even */ 976 len++; 977 *s++ = htons(len + 4); 978 memcpy((uchar *)s, buf, len); 979 s += len / 2; 980 #endif 981 982 #ifdef CONFIG_CDP_PLATFORM 983 *s++ = htons(CDP_PLATFORM_TLV); 984 memset(buf, 0, sizeof(buf)); 985 strcpy(buf, CONFIG_CDP_PLATFORM); 986 len = strlen(buf); 987 if (len & 1) /* make it even */ 988 len++; 989 *s++ = htons(len + 4); 990 memcpy((uchar *)s, buf, len); 991 s += len / 2; 992 #endif 993 994 #ifdef CONFIG_CDP_TRIGGER 995 *s++ = htons(CDP_TRIGGER_TLV); 996 *s++ = htons(8); 997 *(ulong *)s = htonl(CONFIG_CDP_TRIGGER); 998 s += 2; 999 #endif 1000 1001 #ifdef CONFIG_CDP_POWER_CONSUMPTION 1002 *s++ = htons(CDP_POWER_CONSUMPTION_TLV); 1003 *s++ = htons(6); 1004 *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION); 1005 #endif 1006 1007 /* length of ethernet packet */ 1008 len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE); 1009 et->et_protlen = htons(len); 1010 1011 len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr); 1012 chksum = CDP_compute_csum((uchar *)NetTxPacket + len, 1013 (uchar *)s - (NetTxPacket + len)); 1014 if (chksum == 0) 1015 chksum = 0xFFFF; 1016 *cp = htons(chksum); 1017 1018 (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket); 1019 return 0; 1020 } 1021 1022 static void 1023 CDPTimeout(void) 1024 { 1025 CDPSeq++; 1026 1027 if (CDPSeq < 3) { 1028 NetSetTimeout(CDP_TIMEOUT, CDPTimeout); 1029 CDPSendTrigger(); 1030 return; 1031 } 1032 1033 /* if not OK try again */ 1034 if (!CDPOK) 1035 NetStartAgain(); 1036 else 1037 NetState = NETLOOP_SUCCESS; 1038 } 1039 1040 static void 1041 CDPDummyHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 1042 unsigned len) 1043 { 1044 /* nothing */ 1045 } 1046 1047 static void 1048 CDPHandler(const uchar *pkt, unsigned len) 1049 { 1050 const uchar *t; 1051 const ushort *ss; 1052 ushort type, tlen; 1053 uchar applid; 1054 ushort vlan, nvlan; 1055 1056 /* minimum size? */ 1057 if (len < sizeof(CDP_SNAP_hdr) + 4) 1058 goto pkt_short; 1059 1060 /* check for valid CDP SNAP header */ 1061 if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0) 1062 return; 1063 1064 pkt += sizeof(CDP_SNAP_hdr); 1065 len -= sizeof(CDP_SNAP_hdr); 1066 1067 /* Version of CDP protocol must be >= 2 and TTL != 0 */ 1068 if (pkt[0] < 0x02 || pkt[1] == 0) 1069 return; 1070 1071 /* 1072 * if version is greater than 0x02 maybe we'll have a problem; 1073 * output a warning 1074 */ 1075 if (pkt[0] != 0x02) 1076 printf("** WARNING: CDP packet received with a protocol version %d > 2\n", 1077 pkt[0] & 0xff); 1078 1079 if (CDP_compute_csum(pkt, len) != 0) 1080 return; 1081 1082 pkt += 4; 1083 len -= 4; 1084 1085 vlan = htons(-1); 1086 nvlan = htons(-1); 1087 while (len > 0) { 1088 if (len < 4) 1089 goto pkt_short; 1090 1091 ss = (const ushort *)pkt; 1092 type = ntohs(ss[0]); 1093 tlen = ntohs(ss[1]); 1094 if (tlen > len) 1095 goto pkt_short; 1096 1097 pkt += tlen; 1098 len -= tlen; 1099 1100 ss += 2; /* point ss to the data of the TLV */ 1101 tlen -= 4; 1102 1103 switch (type) { 1104 case CDP_DEVICE_ID_TLV: 1105 break; 1106 case CDP_ADDRESS_TLV: 1107 break; 1108 case CDP_PORT_ID_TLV: 1109 break; 1110 case CDP_CAPABILITIES_TLV: 1111 break; 1112 case CDP_VERSION_TLV: 1113 break; 1114 case CDP_PLATFORM_TLV: 1115 break; 1116 case CDP_NATIVE_VLAN_TLV: 1117 nvlan = *ss; 1118 break; 1119 case CDP_APPLIANCE_VLAN_TLV: 1120 t = (const uchar *)ss; 1121 while (tlen > 0) { 1122 if (tlen < 3) 1123 goto pkt_short; 1124 1125 applid = t[0]; 1126 ss = (const ushort *)(t + 1); 1127 1128 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE 1129 if (applid == CONFIG_CDP_APPLIANCE_VLAN_TYPE) 1130 vlan = *ss; 1131 #else 1132 /* XXX will this work; dunno */ 1133 vlan = ntohs(*ss); 1134 #endif 1135 t += 3; tlen -= 3; 1136 } 1137 break; 1138 case CDP_TRIGGER_TLV: 1139 break; 1140 case CDP_POWER_CONSUMPTION_TLV: 1141 break; 1142 case CDP_SYSNAME_TLV: 1143 break; 1144 case CDP_SYSOBJECT_TLV: 1145 break; 1146 case CDP_MANAGEMENT_ADDRESS_TLV: 1147 break; 1148 } 1149 } 1150 1151 CDPApplianceVLAN = vlan; 1152 CDPNativeVLAN = nvlan; 1153 1154 CDPOK = 1; 1155 return; 1156 1157 pkt_short: 1158 printf("** CDP packet is too short\n"); 1159 return; 1160 } 1161 1162 static void CDPStart(void) 1163 { 1164 printf("Using %s device\n", eth_get_name()); 1165 CDPSeq = 0; 1166 CDPOK = 0; 1167 1168 CDPNativeVLAN = htons(-1); 1169 CDPApplianceVLAN = htons(-1); 1170 1171 NetSetTimeout(CDP_TIMEOUT, CDPTimeout); 1172 NetSetHandler(CDPDummyHandler); 1173 1174 CDPSendTrigger(); 1175 } 1176 #endif 1177 1178 #ifdef CONFIG_IP_DEFRAG 1179 /* 1180 * This function collects fragments in a single packet, according 1181 * to the algorithm in RFC815. It returns NULL or the pointer to 1182 * a complete packet, in static storage 1183 */ 1184 #ifndef CONFIG_NET_MAXDEFRAG 1185 #define CONFIG_NET_MAXDEFRAG 16384 1186 #endif 1187 /* 1188 * MAXDEFRAG, above, is chosen in the config file and is real data 1189 * so we need to add the NFS overhead, which is more than TFTP. 1190 * To use sizeof in the internal unnamed structures, we need a real 1191 * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately). 1192 * The compiler doesn't complain nor allocates the actual structure 1193 */ 1194 static struct rpc_t rpc_specimen; 1195 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply)) 1196 1197 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE_NO_UDP) 1198 1199 /* 1200 * this is the packet being assembled, either data or frag control. 1201 * Fragments go by 8 bytes, so this union must be 8 bytes long 1202 */ 1203 struct hole { 1204 /* first_byte is address of this structure */ 1205 u16 last_byte; /* last byte in this hole + 1 (begin of next hole) */ 1206 u16 next_hole; /* index of next (in 8-b blocks), 0 == none */ 1207 u16 prev_hole; /* index of prev, 0 == none */ 1208 u16 unused; 1209 }; 1210 1211 static IP_t *__NetDefragment(IP_t *ip, int *lenp) 1212 { 1213 static uchar pkt_buff[IP_PKTSIZE] __attribute__((aligned(PKTALIGN))); 1214 static u16 first_hole, total_len; 1215 struct hole *payload, *thisfrag, *h, *newh; 1216 IP_t *localip = (IP_t *)pkt_buff; 1217 uchar *indata = (uchar *)ip; 1218 int offset8, start, len, done = 0; 1219 u16 ip_off = ntohs(ip->ip_off); 1220 1221 /* payload starts after IP header, this fragment is in there */ 1222 payload = (struct hole *)(pkt_buff + IP_HDR_SIZE_NO_UDP); 1223 offset8 = (ip_off & IP_OFFS); 1224 thisfrag = payload + offset8; 1225 start = offset8 * 8; 1226 len = ntohs(ip->ip_len) - IP_HDR_SIZE_NO_UDP; 1227 1228 if (start + len > IP_MAXUDP) /* fragment extends too far */ 1229 return NULL; 1230 1231 if (!total_len || localip->ip_id != ip->ip_id) { 1232 /* new (or different) packet, reset structs */ 1233 total_len = 0xffff; 1234 payload[0].last_byte = ~0; 1235 payload[0].next_hole = 0; 1236 payload[0].prev_hole = 0; 1237 first_hole = 0; 1238 /* any IP header will work, copy the first we received */ 1239 memcpy(localip, ip, IP_HDR_SIZE_NO_UDP); 1240 } 1241 1242 /* 1243 * What follows is the reassembly algorithm. We use the payload 1244 * array as a linked list of hole descriptors, as each hole starts 1245 * at a multiple of 8 bytes. However, last byte can be whatever value, 1246 * so it is represented as byte count, not as 8-byte blocks. 1247 */ 1248 1249 h = payload + first_hole; 1250 while (h->last_byte < start) { 1251 if (!h->next_hole) { 1252 /* no hole that far away */ 1253 return NULL; 1254 } 1255 h = payload + h->next_hole; 1256 } 1257 1258 /* last fragment may be 1..7 bytes, the "+7" forces acceptance */ 1259 if (offset8 + ((len + 7) / 8) <= h - payload) { 1260 /* no overlap with holes (dup fragment?) */ 1261 return NULL; 1262 } 1263 1264 if (!(ip_off & IP_FLAGS_MFRAG)) { 1265 /* no more fragmentss: truncate this (last) hole */ 1266 total_len = start + len; 1267 h->last_byte = start + len; 1268 } 1269 1270 /* 1271 * There is some overlap: fix the hole list. This code doesn't 1272 * deal with a fragment that overlaps with two different holes 1273 * (thus being a superset of a previously-received fragment). 1274 */ 1275 1276 if ((h >= thisfrag) && (h->last_byte <= start + len)) { 1277 /* complete overlap with hole: remove hole */ 1278 if (!h->prev_hole && !h->next_hole) { 1279 /* last remaining hole */ 1280 done = 1; 1281 } else if (!h->prev_hole) { 1282 /* first hole */ 1283 first_hole = h->next_hole; 1284 payload[h->next_hole].prev_hole = 0; 1285 } else if (!h->next_hole) { 1286 /* last hole */ 1287 payload[h->prev_hole].next_hole = 0; 1288 } else { 1289 /* in the middle of the list */ 1290 payload[h->next_hole].prev_hole = h->prev_hole; 1291 payload[h->prev_hole].next_hole = h->next_hole; 1292 } 1293 1294 } else if (h->last_byte <= start + len) { 1295 /* overlaps with final part of the hole: shorten this hole */ 1296 h->last_byte = start; 1297 1298 } else if (h >= thisfrag) { 1299 /* overlaps with initial part of the hole: move this hole */ 1300 newh = thisfrag + (len / 8); 1301 *newh = *h; 1302 h = newh; 1303 if (h->next_hole) 1304 payload[h->next_hole].prev_hole = (h - payload); 1305 if (h->prev_hole) 1306 payload[h->prev_hole].next_hole = (h - payload); 1307 else 1308 first_hole = (h - payload); 1309 1310 } else { 1311 /* fragment sits in the middle: split the hole */ 1312 newh = thisfrag + (len / 8); 1313 *newh = *h; 1314 h->last_byte = start; 1315 h->next_hole = (newh - payload); 1316 newh->prev_hole = (h - payload); 1317 if (newh->next_hole) 1318 payload[newh->next_hole].prev_hole = (newh - payload); 1319 } 1320 1321 /* finally copy this fragment and possibly return whole packet */ 1322 memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE_NO_UDP, len); 1323 if (!done) 1324 return NULL; 1325 1326 localip->ip_len = htons(total_len); 1327 *lenp = total_len + IP_HDR_SIZE_NO_UDP; 1328 return localip; 1329 } 1330 1331 static inline IP_t *NetDefragment(IP_t *ip, int *lenp) 1332 { 1333 u16 ip_off = ntohs(ip->ip_off); 1334 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) 1335 return ip; /* not a fragment */ 1336 return __NetDefragment(ip, lenp); 1337 } 1338 1339 #else /* !CONFIG_IP_DEFRAG */ 1340 1341 static inline IP_t *NetDefragment(IP_t *ip, int *lenp) 1342 { 1343 u16 ip_off = ntohs(ip->ip_off); 1344 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) 1345 return ip; /* not a fragment */ 1346 return NULL; 1347 } 1348 #endif 1349 1350 /** 1351 * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently 1352 * drop others. 1353 * 1354 * @parma ip IP packet containing the ICMP 1355 */ 1356 static void receive_icmp(IP_t *ip, int len, IPaddr_t src_ip, Ethernet_t *et) 1357 { 1358 ICMP_t *icmph = (ICMP_t *)&ip->udp_src; 1359 1360 switch (icmph->type) { 1361 case ICMP_REDIRECT: 1362 if (icmph->code != ICMP_REDIR_HOST) 1363 return; 1364 printf(" ICMP Host Redirect to %pI4 ", 1365 &icmph->un.gateway); 1366 break; 1367 #if defined(CONFIG_CMD_PING) 1368 case ICMP_ECHO_REPLY: 1369 /* 1370 * IP header OK. Pass the packet to the 1371 * current handler. 1372 */ 1373 /* 1374 * XXX point to ip packet - should this use 1375 * packet_icmp_handler? 1376 */ 1377 (*packetHandler)((uchar *)ip, 0, src_ip, 0, 0); 1378 break; 1379 case ICMP_ECHO_REQUEST: 1380 debug("Got ICMP ECHO REQUEST, return %d bytes\n", 1381 ETHER_HDR_SIZE + len); 1382 1383 memcpy(&et->et_dest[0], &et->et_src[0], 6); 1384 memcpy(&et->et_src[0], NetOurEther, 6); 1385 1386 ip->ip_sum = 0; 1387 ip->ip_off = 0; 1388 NetCopyIP((void *)&ip->ip_dst, &ip->ip_src); 1389 NetCopyIP((void *)&ip->ip_src, &NetOurIP); 1390 ip->ip_sum = ~NetCksum((uchar *)ip, 1391 IP_HDR_SIZE_NO_UDP >> 1); 1392 1393 icmph->type = ICMP_ECHO_REPLY; 1394 icmph->checksum = 0; 1395 icmph->checksum = ~NetCksum((uchar *)icmph, 1396 (len - IP_HDR_SIZE_NO_UDP) >> 1); 1397 (void) eth_send((uchar *)et, 1398 ETHER_HDR_SIZE + len); 1399 break; 1400 #endif 1401 default: 1402 #ifdef CONFIG_CMD_TFTPPUT 1403 if (packet_icmp_handler) 1404 packet_icmp_handler(icmph->type, icmph->code, 1405 ntohs(ip->udp_dst), src_ip, ntohs(ip->udp_src), 1406 icmph->un.data, ntohs(ip->udp_len)); 1407 #endif 1408 break; 1409 } 1410 } 1411 1412 void 1413 NetReceive(volatile uchar *inpkt, int len) 1414 { 1415 Ethernet_t *et; 1416 IP_t *ip; 1417 ARP_t *arp; 1418 IPaddr_t tmp; 1419 IPaddr_t src_ip; 1420 int x; 1421 uchar *pkt; 1422 #if defined(CONFIG_CMD_CDP) 1423 int iscdp; 1424 #endif 1425 ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid; 1426 1427 debug("packet received\n"); 1428 1429 NetRxPacket = inpkt; 1430 NetRxPacketLen = len; 1431 et = (Ethernet_t *)inpkt; 1432 1433 /* too small packet? */ 1434 if (len < ETHER_HDR_SIZE) 1435 return; 1436 1437 #ifdef CONFIG_API 1438 if (push_packet) { 1439 (*push_packet)(inpkt, len); 1440 return; 1441 } 1442 #endif 1443 1444 #if defined(CONFIG_CMD_CDP) 1445 /* keep track if packet is CDP */ 1446 iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0; 1447 #endif 1448 1449 myvlanid = ntohs(NetOurVLAN); 1450 if (myvlanid == (ushort)-1) 1451 myvlanid = VLAN_NONE; 1452 mynvlanid = ntohs(NetOurNativeVLAN); 1453 if (mynvlanid == (ushort)-1) 1454 mynvlanid = VLAN_NONE; 1455 1456 x = ntohs(et->et_protlen); 1457 1458 debug("packet received\n"); 1459 1460 if (x < 1514) { 1461 /* 1462 * Got a 802 packet. Check the other protocol field. 1463 */ 1464 x = ntohs(et->et_prot); 1465 1466 ip = (IP_t *)(inpkt + E802_HDR_SIZE); 1467 len -= E802_HDR_SIZE; 1468 1469 } else if (x != PROT_VLAN) { /* normal packet */ 1470 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE); 1471 len -= ETHER_HDR_SIZE; 1472 1473 } else { /* VLAN packet */ 1474 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et; 1475 1476 debug("VLAN packet received\n"); 1477 1478 /* too small packet? */ 1479 if (len < VLAN_ETHER_HDR_SIZE) 1480 return; 1481 1482 /* if no VLAN active */ 1483 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE 1484 #if defined(CONFIG_CMD_CDP) 1485 && iscdp == 0 1486 #endif 1487 ) 1488 return; 1489 1490 cti = ntohs(vet->vet_tag); 1491 vlanid = cti & VLAN_IDMASK; 1492 x = ntohs(vet->vet_type); 1493 1494 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE); 1495 len -= VLAN_ETHER_HDR_SIZE; 1496 } 1497 1498 debug("Receive from protocol 0x%x\n", x); 1499 1500 #if defined(CONFIG_CMD_CDP) 1501 if (iscdp) { 1502 CDPHandler((uchar *)ip, len); 1503 return; 1504 } 1505 #endif 1506 1507 if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) { 1508 if (vlanid == VLAN_NONE) 1509 vlanid = (mynvlanid & VLAN_IDMASK); 1510 /* not matched? */ 1511 if (vlanid != (myvlanid & VLAN_IDMASK)) 1512 return; 1513 } 1514 1515 switch (x) { 1516 1517 case PROT_ARP: 1518 /* 1519 * We have to deal with two types of ARP packets: 1520 * - REQUEST packets will be answered by sending our 1521 * IP address - if we know it. 1522 * - REPLY packates are expected only after we asked 1523 * for the TFTP server's or the gateway's ethernet 1524 * address; so if we receive such a packet, we set 1525 * the server ethernet address 1526 */ 1527 debug("Got ARP\n"); 1528 1529 arp = (ARP_t *)ip; 1530 if (len < ARP_HDR_SIZE) { 1531 printf("bad length %d < %d\n", len, ARP_HDR_SIZE); 1532 return; 1533 } 1534 if (ntohs(arp->ar_hrd) != ARP_ETHER) 1535 return; 1536 if (ntohs(arp->ar_pro) != PROT_IP) 1537 return; 1538 if (arp->ar_hln != 6) 1539 return; 1540 if (arp->ar_pln != 4) 1541 return; 1542 1543 if (NetOurIP == 0) 1544 return; 1545 1546 if (NetReadIP(&arp->ar_data[16]) != NetOurIP) 1547 return; 1548 1549 switch (ntohs(arp->ar_op)) { 1550 case ARPOP_REQUEST: 1551 /* reply with our IP address */ 1552 debug("Got ARP REQUEST, return our IP\n"); 1553 pkt = (uchar *)et; 1554 pkt += NetSetEther(pkt, et->et_src, PROT_ARP); 1555 arp->ar_op = htons(ARPOP_REPLY); 1556 memcpy(&arp->ar_data[10], &arp->ar_data[0], 6); 1557 NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]); 1558 memcpy(&arp->ar_data[0], NetOurEther, 6); 1559 NetCopyIP(&arp->ar_data[6], &NetOurIP); 1560 (void) eth_send((uchar *)et, 1561 (pkt - (uchar *)et) + ARP_HDR_SIZE); 1562 return; 1563 1564 case ARPOP_REPLY: /* arp reply */ 1565 /* are we waiting for a reply */ 1566 if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC) 1567 break; 1568 1569 #ifdef CONFIG_KEEP_SERVERADDR 1570 if (NetServerIP == NetArpWaitPacketIP) { 1571 char buf[20]; 1572 sprintf(buf, "%pM", arp->ar_data); 1573 setenv("serveraddr", buf); 1574 } 1575 #endif 1576 1577 debug("Got ARP REPLY, set server/gtwy eth addr (%pM)\n", 1578 arp->ar_data); 1579 1580 tmp = NetReadIP(&arp->ar_data[6]); 1581 1582 /* matched waiting packet's address */ 1583 if (tmp == NetArpWaitReplyIP) { 1584 debug("Got it\n"); 1585 /* save address for later use */ 1586 memcpy(NetArpWaitPacketMAC, 1587 &arp->ar_data[0], 6); 1588 1589 #ifdef CONFIG_NETCONSOLE 1590 (*packetHandler)(0, 0, 0, 0, 0); 1591 #endif 1592 /* modify header, and transmit it */ 1593 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6); 1594 (void) eth_send(NetArpWaitTxPacket, 1595 NetArpWaitTxPacketSize); 1596 1597 /* no arp request pending now */ 1598 NetArpWaitPacketIP = 0; 1599 NetArpWaitTxPacketSize = 0; 1600 NetArpWaitPacketMAC = NULL; 1601 1602 } 1603 return; 1604 default: 1605 debug("Unexpected ARP opcode 0x%x\n", 1606 ntohs(arp->ar_op)); 1607 return; 1608 } 1609 break; 1610 1611 #ifdef CONFIG_CMD_RARP 1612 case PROT_RARP: 1613 debug("Got RARP\n"); 1614 arp = (ARP_t *)ip; 1615 if (len < ARP_HDR_SIZE) { 1616 printf("bad length %d < %d\n", len, ARP_HDR_SIZE); 1617 return; 1618 } 1619 1620 if ((ntohs(arp->ar_op) != RARPOP_REPLY) || 1621 (ntohs(arp->ar_hrd) != ARP_ETHER) || 1622 (ntohs(arp->ar_pro) != PROT_IP) || 1623 (arp->ar_hln != 6) || (arp->ar_pln != 4)) { 1624 1625 puts("invalid RARP header\n"); 1626 } else { 1627 NetCopyIP(&NetOurIP, &arp->ar_data[16]); 1628 if (NetServerIP == 0) 1629 NetCopyIP(&NetServerIP, &arp->ar_data[6]); 1630 memcpy(NetServerEther, &arp->ar_data[0], 6); 1631 1632 (*packetHandler)(0, 0, 0, 0, 0); 1633 } 1634 break; 1635 #endif 1636 case PROT_IP: 1637 debug("Got IP\n"); 1638 /* Before we start poking the header, make sure it is there */ 1639 if (len < IP_HDR_SIZE) { 1640 debug("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE); 1641 return; 1642 } 1643 /* Check the packet length */ 1644 if (len < ntohs(ip->ip_len)) { 1645 printf("len bad %d < %d\n", len, ntohs(ip->ip_len)); 1646 return; 1647 } 1648 len = ntohs(ip->ip_len); 1649 debug("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff); 1650 1651 /* Can't deal with anything except IPv4 */ 1652 if ((ip->ip_hl_v & 0xf0) != 0x40) 1653 return; 1654 /* Can't deal with IP options (headers != 20 bytes) */ 1655 if ((ip->ip_hl_v & 0x0f) > 0x05) 1656 return; 1657 /* Check the Checksum of the header */ 1658 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) { 1659 puts("checksum bad\n"); 1660 return; 1661 } 1662 /* If it is not for us, ignore it */ 1663 tmp = NetReadIP(&ip->ip_dst); 1664 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) { 1665 #ifdef CONFIG_MCAST_TFTP 1666 if (Mcast_addr != tmp) 1667 #endif 1668 return; 1669 } 1670 /* Read source IP address for later use */ 1671 src_ip = NetReadIP(&ip->ip_src); 1672 /* 1673 * The function returns the unchanged packet if it's not 1674 * a fragment, and either the complete packet or NULL if 1675 * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL) 1676 */ 1677 ip = NetDefragment(ip, &len); 1678 if (!ip) 1679 return; 1680 /* 1681 * watch for ICMP host redirects 1682 * 1683 * There is no real handler code (yet). We just watch 1684 * for ICMP host redirect messages. In case anybody 1685 * sees these messages: please contact me 1686 * (wd@denx.de), or - even better - send me the 1687 * necessary fixes :-) 1688 * 1689 * Note: in all cases where I have seen this so far 1690 * it was a problem with the router configuration, 1691 * for instance when a router was configured in the 1692 * BOOTP reply, but the TFTP server was on the same 1693 * subnet. So this is probably a warning that your 1694 * configuration might be wrong. But I'm not really 1695 * sure if there aren't any other situations. 1696 * 1697 * Simon Glass <sjg@chromium.org>: We get an ICMP when 1698 * we send a tftp packet to a dead connection, or when 1699 * there is no server at the other end. 1700 */ 1701 if (ip->ip_p == IPPROTO_ICMP) { 1702 receive_icmp(ip, len, src_ip, et); 1703 return; 1704 } else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */ 1705 return; 1706 } 1707 1708 #ifdef CONFIG_UDP_CHECKSUM 1709 if (ip->udp_xsum != 0) { 1710 ulong xsum; 1711 ushort *sumptr; 1712 ushort sumlen; 1713 1714 xsum = ip->ip_p; 1715 xsum += (ntohs(ip->udp_len)); 1716 xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff; 1717 xsum += (ntohl(ip->ip_src) >> 0) & 0x0000ffff; 1718 xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff; 1719 xsum += (ntohl(ip->ip_dst) >> 0) & 0x0000ffff; 1720 1721 sumlen = ntohs(ip->udp_len); 1722 sumptr = (ushort *) &(ip->udp_src); 1723 1724 while (sumlen > 1) { 1725 ushort sumdata; 1726 1727 sumdata = *sumptr++; 1728 xsum += ntohs(sumdata); 1729 sumlen -= 2; 1730 } 1731 if (sumlen > 0) { 1732 ushort sumdata; 1733 1734 sumdata = *(unsigned char *) sumptr; 1735 sumdata = (sumdata << 8) & 0xff00; 1736 xsum += sumdata; 1737 } 1738 while ((xsum >> 16) != 0) { 1739 xsum = (xsum & 0x0000ffff) + 1740 ((xsum >> 16) & 0x0000ffff); 1741 } 1742 if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) { 1743 printf(" UDP wrong checksum %08lx %08x\n", 1744 xsum, ntohs(ip->udp_xsum)); 1745 return; 1746 } 1747 } 1748 #endif 1749 1750 1751 #ifdef CONFIG_NETCONSOLE 1752 nc_input_packet((uchar *)ip + IP_HDR_SIZE, 1753 ntohs(ip->udp_dst), 1754 ntohs(ip->udp_src), 1755 ntohs(ip->udp_len) - 8); 1756 #endif 1757 /* 1758 * IP header OK. Pass the packet to the current handler. 1759 */ 1760 (*packetHandler)((uchar *)ip + IP_HDR_SIZE, 1761 ntohs(ip->udp_dst), 1762 src_ip, 1763 ntohs(ip->udp_src), 1764 ntohs(ip->udp_len) - 8); 1765 break; 1766 } 1767 } 1768 1769 1770 /**********************************************************************/ 1771 1772 static int net_check_prereq(enum proto_t protocol) 1773 { 1774 switch (protocol) { 1775 /* Fall through */ 1776 #if defined(CONFIG_CMD_PING) 1777 case PING: 1778 if (NetPingIP == 0) { 1779 puts("*** ERROR: ping address not given\n"); 1780 return 1; 1781 } 1782 goto common; 1783 #endif 1784 #if defined(CONFIG_CMD_SNTP) 1785 case SNTP: 1786 if (NetNtpServerIP == 0) { 1787 puts("*** ERROR: NTP server address not given\n"); 1788 return 1; 1789 } 1790 goto common; 1791 #endif 1792 #if defined(CONFIG_CMD_DNS) 1793 case DNS: 1794 if (NetOurDNSIP == 0) { 1795 puts("*** ERROR: DNS server address not given\n"); 1796 return 1; 1797 } 1798 goto common; 1799 #endif 1800 #if defined(CONFIG_CMD_NFS) 1801 case NFS: 1802 #endif 1803 case TFTPGET: 1804 case TFTPPUT: 1805 if (NetServerIP == 0) { 1806 puts("*** ERROR: `serverip' not set\n"); 1807 return 1; 1808 } 1809 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \ 1810 defined(CONFIG_CMD_DNS) 1811 common: 1812 #endif 1813 /* Fall through */ 1814 1815 case NETCONS: 1816 case TFTPSRV: 1817 if (NetOurIP == 0) { 1818 puts("*** ERROR: `ipaddr' not set\n"); 1819 return 1; 1820 } 1821 /* Fall through */ 1822 1823 #ifdef CONFIG_CMD_RARP 1824 case RARP: 1825 #endif 1826 case BOOTP: 1827 case CDP: 1828 case DHCP: 1829 if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) { 1830 extern int eth_get_dev_index(void); 1831 int num = eth_get_dev_index(); 1832 1833 switch (num) { 1834 case -1: 1835 puts("*** ERROR: No ethernet found.\n"); 1836 return 1; 1837 case 0: 1838 puts("*** ERROR: `ethaddr' not set\n"); 1839 break; 1840 default: 1841 printf("*** ERROR: `eth%daddr' not set\n", 1842 num); 1843 break; 1844 } 1845 1846 NetStartAgain(); 1847 return 2; 1848 } 1849 /* Fall through */ 1850 default: 1851 return 0; 1852 } 1853 return 0; /* OK */ 1854 } 1855 /**********************************************************************/ 1856 1857 int 1858 NetCksumOk(uchar *ptr, int len) 1859 { 1860 return !((NetCksum(ptr, len) + 1) & 0xfffe); 1861 } 1862 1863 1864 unsigned 1865 NetCksum(uchar *ptr, int len) 1866 { 1867 ulong xsum; 1868 ushort *p = (ushort *)ptr; 1869 1870 xsum = 0; 1871 while (len-- > 0) 1872 xsum += *p++; 1873 xsum = (xsum & 0xffff) + (xsum >> 16); 1874 xsum = (xsum & 0xffff) + (xsum >> 16); 1875 return xsum & 0xffff; 1876 } 1877 1878 int 1879 NetEthHdrSize(void) 1880 { 1881 ushort myvlanid; 1882 1883 myvlanid = ntohs(NetOurVLAN); 1884 if (myvlanid == (ushort)-1) 1885 myvlanid = VLAN_NONE; 1886 1887 return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : 1888 VLAN_ETHER_HDR_SIZE; 1889 } 1890 1891 int 1892 NetSetEther(volatile uchar *xet, uchar * addr, uint prot) 1893 { 1894 Ethernet_t *et = (Ethernet_t *)xet; 1895 ushort myvlanid; 1896 1897 myvlanid = ntohs(NetOurVLAN); 1898 if (myvlanid == (ushort)-1) 1899 myvlanid = VLAN_NONE; 1900 1901 memcpy(et->et_dest, addr, 6); 1902 memcpy(et->et_src, NetOurEther, 6); 1903 if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) { 1904 et->et_protlen = htons(prot); 1905 return ETHER_HDR_SIZE; 1906 } else { 1907 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet; 1908 1909 vet->vet_vlan_type = htons(PROT_VLAN); 1910 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK)); 1911 vet->vet_type = htons(prot); 1912 return VLAN_ETHER_HDR_SIZE; 1913 } 1914 } 1915 1916 void 1917 NetSetIP(volatile uchar *xip, IPaddr_t dest, int dport, int sport, int len) 1918 { 1919 IP_t *ip = (IP_t *)xip; 1920 1921 /* 1922 * If the data is an odd number of bytes, zero the 1923 * byte after the last byte so that the checksum 1924 * will work. 1925 */ 1926 if (len & 1) 1927 xip[IP_HDR_SIZE + len] = 0; 1928 1929 /* 1930 * Construct an IP and UDP header. 1931 * (need to set no fragment bit - XXX) 1932 */ 1933 /* IP_HDR_SIZE / 4 (not including UDP) */ 1934 ip->ip_hl_v = 0x45; 1935 ip->ip_tos = 0; 1936 ip->ip_len = htons(IP_HDR_SIZE + len); 1937 ip->ip_id = htons(NetIPID++); 1938 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ 1939 ip->ip_ttl = 255; 1940 ip->ip_p = 17; /* UDP */ 1941 ip->ip_sum = 0; 1942 /* already in network byte order */ 1943 NetCopyIP((void *)&ip->ip_src, &NetOurIP); 1944 /* - "" - */ 1945 NetCopyIP((void *)&ip->ip_dst, &dest); 1946 ip->udp_src = htons(sport); 1947 ip->udp_dst = htons(dport); 1948 ip->udp_len = htons(8 + len); 1949 ip->udp_xsum = 0; 1950 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2); 1951 } 1952 1953 void copy_filename(char *dst, const char *src, int size) 1954 { 1955 if (*src && (*src == '"')) { 1956 ++src; 1957 --size; 1958 } 1959 1960 while ((--size > 0) && *src && (*src != '"')) 1961 *dst++ = *src++; 1962 *dst = '\0'; 1963 } 1964 1965 #if defined(CONFIG_CMD_NFS) || \ 1966 defined(CONFIG_CMD_SNTP) || \ 1967 defined(CONFIG_CMD_DNS) 1968 /* 1969 * make port a little random (1024-17407) 1970 * This keeps the math somewhat trivial to compute, and seems to work with 1971 * all supported protocols/clients/servers 1972 */ 1973 unsigned int random_port(void) 1974 { 1975 return 1024 + (get_timer(0) % 0x4000); 1976 } 1977 #endif 1978 1979 void ip_to_string(IPaddr_t x, char *s) 1980 { 1981 x = ntohl(x); 1982 sprintf(s, "%d.%d.%d.%d", 1983 (int) ((x >> 24) & 0xff), 1984 (int) ((x >> 16) & 0xff), 1985 (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff) 1986 ); 1987 } 1988 1989 void VLAN_to_string(ushort x, char *s) 1990 { 1991 x = ntohs(x); 1992 1993 if (x == (ushort)-1) 1994 x = VLAN_NONE; 1995 1996 if (x == VLAN_NONE) 1997 strcpy(s, "none"); 1998 else 1999 sprintf(s, "%d", x & VLAN_IDMASK); 2000 } 2001 2002 ushort string_to_VLAN(const char *s) 2003 { 2004 ushort id; 2005 2006 if (s == NULL) 2007 return htons(VLAN_NONE); 2008 2009 if (*s < '0' || *s > '9') 2010 id = VLAN_NONE; 2011 else 2012 id = (ushort)simple_strtoul(s, NULL, 10); 2013 2014 return htons(id); 2015 } 2016 2017 ushort getenv_VLAN(char *var) 2018 { 2019 return string_to_VLAN(getenv(var)); 2020 } 2021