net/net.c

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