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 <net.h>
  81 #include "bootp.h"
  82 #include "tftp.h"
  83 #include "rarp.h"
  84 #include "nfs.h"
  85 #ifdef CONFIG_STATUS_LED
  86 #include <status_led.h>
  87 #include <miiphy.h>
  88 #endif
  89 #if (CONFIG_COMMANDS & CFG_CMD_SNTP)
  90 #include "sntp.h"
  91 #endif
  92
  93 #if (CONFIG_COMMANDS & CFG_CMD_NET)
  94
  95 #define ARP_TIMEOUT             5               /* Seconds before trying ARP again */
  96 #ifndef CONFIG_NET_RETRY_COUNT
  97 # define ARP_TIMEOUT_COUNT      5               /* # of timeouts before giving up  */
  98 #else
  99 # define ARP_TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT)
 100 #endif
 101
 102 #if 0
 103 #define ET_DEBUG
 104 #endif
 105
 106 /** BOOTP EXTENTIONS **/
 107
 108 IPaddr_t        NetOurSubnetMask=0;             /* Our subnet mask (0=unknown)  */
 109 IPaddr_t        NetOurGatewayIP=0;              /* Our gateways IP address      */
 110 IPaddr_t        NetOurDNSIP=0;                  /* Our DNS IP address           */
 111 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS2)
 112 IPaddr_t        NetOurDNS2IP=0;                 /* Our 2nd DNS IP address       */
 113 #endif
 114 char            NetOurNISDomain[32]={0,};       /* Our NIS domain               */
 115 char            NetOurHostName[32]={0,};        /* Our hostname                 */
 116 char            NetOurRootPath[64]={0,};        /* Our bootpath                 */
 117 ushort          NetBootFileSize=0;              /* Our bootfile size in blocks  */
 118
 119 /** END OF BOOTP EXTENTIONS **/
 120
 121 ulong           NetBootFileXferSize;    /* The actual transferred size of the bootfile (in bytes) */
 122 uchar           NetOurEther[6];         /* Our ethernet address                 */
 123 uchar           NetServerEther[6] =     /* Boot server enet address             */
 124                         { 0, 0, 0, 0, 0, 0 };
 125 IPaddr_t        NetOurIP;               /* Our IP addr (0 = unknown)            */
 126 IPaddr_t        NetServerIP;            /* Our IP addr (0 = unknown)            */
 127 volatile uchar *NetRxPkt;               /* Current receive packet               */
 128 int             NetRxPktLen;            /* Current rx packet length             */
 129 unsigned        NetIPID;                /* IP packet ID                         */
 130 uchar           NetBcastAddr[6] =       /* Ethernet bcast address               */
 131                         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 132 uchar           NetEtherNullAddr[6] =
 133                         { 0, 0, 0, 0, 0, 0 };
 134 #if (CONFIG_COMMANDS & CFG_CMD_CDP)
 135 uchar           NetCDPAddr[6] =         /* Ethernet bcast address               */
 136                         { 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc };
 137 #endif
 138 int             NetState;               /* Network loop state                   */
 139 #ifdef CONFIG_NET_MULTI
 140 int             NetRestartWrap = 0;     /* Tried all network devices            */
 141 static int      NetRestarted = 0;       /* Network loop restarted               */
 142 static int      NetDevExists = 0;       /* At least one device configured       */
 143 #endif
 144
 145 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
 146 ushort          NetOurVLAN = 0xFFFF;            /* default is without VLAN      */
 147 ushort          NetOurNativeVLAN = 0xFFFF;      /* ditto                        */
 148
 149 char            BootFile[128];          /* Boot File name                       */
 150
 151 #if (CONFIG_COMMANDS & CFG_CMD_PING)
 152 IPaddr_t        NetPingIP;              /* the ip address to ping               */
 153
 154 static void PingStart(void);
 155 #endif
 156
 157 #if (CONFIG_COMMANDS & CFG_CMD_CDP)
 158 static void CDPStart(void);
 159 #endif
 160
 161 #if (CONFIG_COMMANDS & CFG_CMD_SNTP)
 162 IPaddr_t        NetNtpServerIP;         /* NTP server IP address                */
 163 int             NetTimeOffset=0;        /* offset time from UTC                 */
 164 #endif
 165
 166 #ifdef CONFIG_NETCONSOLE
 167 void NcStart(void);
 168 int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len);
 169 #endif
 170
 171 volatile uchar  PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 172
 173 volatile uchar *NetRxPackets[PKTBUFSRX]; /* Receive packets                     */
 174
 175 static rxhand_f *packetHandler;         /* Current RX packet handler            */
 176 static thand_f *timeHandler;            /* Current timeout handler              */
 177 static ulong    timeStart;              /* Time base value                      */
 178 static ulong    timeDelta;              /* Current timeout value                */
 179 volatile uchar *NetTxPacket = 0;        /* THE transmit packet                  */
 180
 181 static int net_check_prereq (proto_t protocol);
 182
 183 /**********************************************************************/
 184
 185 IPaddr_t        NetArpWaitPacketIP;
 186 IPaddr_t        NetArpWaitReplyIP;
 187 uchar          *NetArpWaitPacketMAC;    /* MAC address of waiting packet's destination  */
 188 uchar          *NetArpWaitTxPacket;     /* THE transmit packet                  */
 189 int             NetArpWaitTxPacketSize;
 190 uchar           NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
 191 ulong           NetArpWaitTimerStart;
 192 int             NetArpWaitTry;
 193
 194 void ArpRequest (void)
 195 {
 196         int i;
 197         volatile uchar *pkt;
 198         ARP_t *arp;
 199
 200 #ifdef ET_DEBUG
 201         printf ("ARP broadcast %d\n", NetArpWaitTry);
 202 #endif
 203         pkt = NetTxPacket;
 204
 205         pkt += NetSetEther (pkt, NetBcastAddr, PROT_ARP);
 206
 207         arp = (ARP_t *) pkt;
 208
 209         arp->ar_hrd = htons (ARP_ETHER);
 210         arp->ar_pro = htons (PROT_IP);
 211         arp->ar_hln = 6;
 212         arp->ar_pln = 4;
 213         arp->ar_op = htons (ARPOP_REQUEST);
 214
 215         memcpy (&arp->ar_data[0], NetOurEther, 6);              /* source ET addr       */
 216         NetWriteIP ((uchar *) & arp->ar_data[6], NetOurIP);     /* source IP addr       */
 217         for (i = 10; i < 16; ++i) {
 218                 arp->ar_data[i] = 0;                            /* dest ET addr = 0     */
 219         }
 220
 221         if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
 222             (NetOurIP & NetOurSubnetMask)) {
 223                 if (NetOurGatewayIP == 0) {
 224                         puts ("## Warning: gatewayip needed but not set\n");
 225                 }
 226                 NetArpWaitReplyIP = NetOurGatewayIP;
 227         } else {
 228                 NetArpWaitReplyIP = NetArpWaitPacketIP;
 229         }
 230
 231         NetWriteIP ((uchar *) & arp->ar_data[16], NetArpWaitReplyIP);
 232         (void) eth_send (NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
 233 }
 234
 235 void ArpTimeoutCheck(void)
 236 {
 237         ulong t;
 238
 239         if (!NetArpWaitPacketIP)
 240                 return;
 241
 242         t = get_timer(0);
 243
 244         /* check for arp timeout */
 245         if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT * CFG_HZ) {
 246                 NetArpWaitTry++;
 247
 248                 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
 249                         puts ("\nARP Retry count exceeded; starting again\n");
 250                         NetArpWaitTry = 0;
 251                         NetStartAgain();
 252                 } else {
 253                         NetArpWaitTimerStart = t;
 254                         ArpRequest();
 255                 }
 256         }
 257 }
 258
 259 /**********************************************************************/
 260 /*
 261  *      Main network processing loop.
 262  */
 263
 264 int
 265 NetLoop(proto_t protocol)
 266 {
 267         DECLARE_GLOBAL_DATA_PTR;
 268
 269         bd_t *bd = gd->bd;
 270
 271 #ifdef CONFIG_NET_MULTI
 272         NetRestarted = 0;
 273         NetDevExists = 0;
 274 #endif
 275
 276         /* XXX problem with bss workaround */
 277         NetArpWaitPacketMAC = NULL;
 278         NetArpWaitTxPacket = NULL;
 279         NetArpWaitPacketIP = 0;
 280         NetArpWaitReplyIP = 0;
 281         NetArpWaitTxPacket = NULL;
 282         NetTxPacket = NULL;
 283
 284         if (!NetTxPacket) {
 285                 int     i;
 286                 /*
 287                  *      Setup packet buffers, aligned correctly.
 288                  */
 289                 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
 290                 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
 291                 for (i = 0; i < PKTBUFSRX; i++) {
 292                         NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
 293                 }
 294         }
 295
 296         if (!NetArpWaitTxPacket) {
 297                 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
 298                 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
 299                 NetArpWaitTxPacketSize = 0;
 300         }
 301
 302         eth_halt();
 303 #ifdef CONFIG_NET_MULTI
 304         eth_set_current();
 305 #endif
 306         if (eth_init(bd) < 0) {
 307                 eth_halt();
 308                 return(-1);
 309         }
 310
 311 restart:
 312 #ifdef CONFIG_NET_MULTI
 313         memcpy (NetOurEther, eth_get_dev()->enetaddr, 6);
 314 #else
 315         memcpy (NetOurEther, bd->bi_enetaddr, 6);
 316 #endif
 317
 318         NetState = NETLOOP_CONTINUE;
 319
 320         /*
 321          *      Start the ball rolling with the given start function.  From
 322          *      here on, this code is a state machine driven by received
 323          *      packets and timer events.
 324          */
 325
 326         switch (protocol) {
 327 #if (CONFIG_COMMANDS & CFG_CMD_NFS)
 328         case NFS:
 329 #endif
 330 #if (CONFIG_COMMANDS & CFG_CMD_PING)
 331         case PING:
 332 #endif
 333 #if (CONFIG_COMMANDS & CFG_CMD_SNTP)
 334         case SNTP:
 335 #endif
 336         case NETCONS:
 337         case TFTP:
 338                 NetCopyIP(&NetOurIP, &bd->bi_ip_addr);
 339                 NetOurGatewayIP = getenv_IPaddr ("gatewayip");
 340                 NetOurSubnetMask= getenv_IPaddr ("netmask");
 341                 NetOurVLAN = getenv_VLAN("vlan");
 342                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 343
 344                 switch (protocol) {
 345 #if (CONFIG_COMMANDS & CFG_CMD_NFS)
 346                 case NFS:
 347 #endif
 348                 case NETCONS:
 349                 case TFTP:
 350                         NetServerIP = getenv_IPaddr ("serverip");
 351                         break;
 352 #if (CONFIG_COMMANDS & CFG_CMD_PING)
 353                 case PING:
 354                         /* nothing */
 355                         break;
 356 #endif
 357 #if (CONFIG_COMMANDS & CFG_CMD_SNTP)
 358                 case SNTP:
 359                         /* nothing */
 360                         break;
 361 #endif
 362                 default:
 363                         break;
 364                 }
 365
 366                 break;
 367         case BOOTP:
 368         case RARP:
 369                 /*
 370                  * initialize our IP addr to 0 in order to accept ANY
 371                  * IP addr assigned to us by the BOOTP / RARP server
 372                  */
 373                 NetOurIP = 0;
 374                 NetServerIP = getenv_IPaddr ("serverip");
 375                 NetOurVLAN = getenv_VLAN("vlan");       /* VLANs must be read */
 376                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 377         case CDP:
 378                 NetOurVLAN = getenv_VLAN("vlan");       /* VLANs must be read */
 379                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 380                 break;
 381         default:
 382                 break;
 383         }
 384
 385         switch (net_check_prereq (protocol)) {
 386         case 1:
 387                 /* network not configured */
 388                 eth_halt();
 389                 return (-1);
 390
 391 #ifdef CONFIG_NET_MULTI
 392         case 2:
 393                 /* network device not configured */
 394                 break;
 395 #endif /* CONFIG_NET_MULTI */
 396
 397         case 0:
 398 #ifdef CONFIG_NET_MULTI
 399                 NetDevExists = 1;
 400 #endif
 401                 switch (protocol) {
 402                 case TFTP:
 403                         /* always use ARP to get server ethernet address */
 404                         TftpStart();
 405                         break;
 406
 407 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
 408                 case DHCP:
 409                         /* Start with a clean slate... */
 410                         BootpTry = 0;
 411                         NetOurIP = 0;
 412                         NetServerIP = getenv_IPaddr ("serverip");
 413                         DhcpRequest();          /* Basically same as BOOTP */
 414                         break;
 415 #endif /* CFG_CMD_DHCP */
 416
 417                 case BOOTP:
 418                         BootpTry = 0;
 419                         BootpRequest ();
 420                         break;
 421
 422                 case RARP:
 423                         RarpTry = 0;
 424                         RarpRequest ();
 425                         break;
 426 #if (CONFIG_COMMANDS & CFG_CMD_PING)
 427                 case PING:
 428                         PingStart();
 429                         break;
 430 #endif
 431 #if (CONFIG_COMMANDS & CFG_CMD_NFS)
 432                 case NFS:
 433                         NfsStart();
 434                         break;
 435 #endif
 436 #if (CONFIG_COMMANDS & CFG_CMD_CDP)
 437                 case CDP:
 438                         CDPStart();
 439                         break;
 440 #endif
 441 #ifdef CONFIG_NETCONSOLE
 442                 case NETCONS:
 443                         NcStart();
 444                         break;
 445 #endif
 446 #if (CONFIG_COMMANDS & CFG_CMD_SNTP)
 447                 case SNTP:
 448                         SntpStart();
 449                         break;
 450 #endif
 451                 default:
 452                         break;
 453                 }
 454
 455                 NetBootFileXferSize = 0;
 456                 break;
 457         }
 458
 459 #if defined(CONFIG_MII) || (CONFIG_COMMANDS & CFG_CMD_MII)
 460 #if defined(CFG_FAULT_ECHO_LINK_DOWN) && defined(CONFIG_STATUS_LED) && defined(STATUS_LED_RED)
 461         /*
 462          * Echo the inverted link state to the fault LED.
 463          */
 464         if(miiphy_link(CFG_FAULT_MII_ADDR)) {
 465                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 466         } else {
 467                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 468         }
 469 #endif /* CFG_FAULT_ECHO_LINK_DOWN, ... */
 470 #endif /* CONFIG_MII, ... */
 471
 472         /*
 473          *      Main packet reception loop.  Loop receiving packets until
 474          *      someone sets `NetState' to a state that terminates.
 475          */
 476         for (;;) {
 477                 WATCHDOG_RESET();
 478 #ifdef CONFIG_SHOW_ACTIVITY
 479                 {
 480                         extern void show_activity(int arg);
 481                         show_activity(1);
 482                 }
 483 #endif
 484                 /*
 485                  *      Check the ethernet for a new packet.  The ethernet
 486                  *      receive routine will process it.
 487                  */
 488                         eth_rx();
 489
 490                 /*
 491                  *      Abort if ctrl-c was pressed.
 492                  */
 493                 if (ctrlc()) {
 494                         eth_halt();
 495                         puts ("\nAbort\n");
 496                         return (-1);
 497                 }
 498
 499                 ArpTimeoutCheck();
 500
 501                 /*
 502                  *      Check for a timeout, and run the timeout handler
 503                  *      if we have one.
 504                  */
 505                 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
 506                         thand_f *x;
 507
 508 #if defined(CONFIG_MII) || (CONFIG_COMMANDS & CFG_CMD_MII)
 509 #  if defined(CFG_FAULT_ECHO_LINK_DOWN) && \
 510       defined(CONFIG_STATUS_LED) &&        \
 511       defined(STATUS_LED_RED)
 512                         /*
 513                          * Echo the inverted link state to the fault LED.
 514                          */
 515                         if(miiphy_link(CFG_FAULT_MII_ADDR)) {
 516                                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 517                         } else {
 518                                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 519                         }
 520 #  endif /* CFG_FAULT_ECHO_LINK_DOWN, ... */
 521 #endif /* CONFIG_MII, ... */
 522                         x = timeHandler;
 523                         timeHandler = (thand_f *)0;
 524                         (*x)();
 525                 }
 526
 527
 528                 switch (NetState) {
 529
 530                 case NETLOOP_RESTART:
 531 #ifdef CONFIG_NET_MULTI
 532                         NetRestarted = 1;
 533 #endif
 534                         goto restart;
 535
 536                 case NETLOOP_SUCCESS:
 537                         if (NetBootFileXferSize > 0) {
 538                                 char buf[10];
 539                                 printf("Bytes transferred = %ld (%lx hex)\n",
 540                                         NetBootFileXferSize,
 541                                         NetBootFileXferSize);
 542                                 sprintf(buf, "%lx", NetBootFileXferSize);
 543                                 setenv("filesize", buf);
 544
 545                                 sprintf(buf, "%lX", (unsigned long)load_addr);
 546                                 setenv("fileaddr", buf);
 547                         }
 548                         eth_halt();
 549                         return NetBootFileXferSize;
 550
 551                 case NETLOOP_FAIL:
 552                         return (-1);
 553                 }
 554         }
 555 }
 556
 557 /**********************************************************************/
 558
 559 static void
 560 startAgainTimeout(void)
 561 {
 562         NetState = NETLOOP_RESTART;
 563 }
 564
 565 static void
 566 startAgainHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
 567 {
 568         /* Totally ignore the packet */
 569 }
 570
 571 void NetStartAgain (void)
 572 {
 573 #ifdef  CONFIG_NET_MULTI
 574         DECLARE_GLOBAL_DATA_PTR;
 575 #endif
 576         char *nretry;
 577         int noretry = 0, once = 0;
 578
 579         if ((nretry = getenv ("netretry")) != NULL) {
 580                 noretry = (strcmp (nretry, "no") == 0);
 581                 once = (strcmp (nretry, "once") == 0);
 582         }
 583         if (noretry) {
 584                 eth_halt ();
 585                 NetState = NETLOOP_FAIL;
 586                 return;
 587         }
 588 #ifndef CONFIG_NET_MULTI
 589         NetSetTimeout (10 * CFG_HZ, startAgainTimeout);
 590         NetSetHandler (startAgainHandler);
 591 #else   /* !CONFIG_NET_MULTI*/
 592         eth_halt ();
 593         eth_try_another (!NetRestarted);
 594         eth_init (gd->bd);
 595         if (NetRestartWrap) {
 596                 NetRestartWrap = 0;
 597                 if (NetDevExists && !once) {
 598                         NetSetTimeout (10 * CFG_HZ, startAgainTimeout);
 599                         NetSetHandler (startAgainHandler);
 600                 } else {
 601                         NetState = NETLOOP_FAIL;
 602                 }
 603         } else {
 604                 NetState = NETLOOP_RESTART;
 605         }
 606 #endif  /* CONFIG_NET_MULTI */
 607 }
 608
 609 /**********************************************************************/
 610 /*
 611  *      Miscelaneous bits.
 612  */
 613
 614 void
 615 NetSetHandler(rxhand_f * f)
 616 {
 617         packetHandler = f;
 618 }
 619
 620
 621 void
 622 NetSetTimeout(ulong iv, thand_f * f)
 623 {
 624         if (iv == 0) {
 625                 timeHandler = (thand_f *)0;
 626         } else {
 627                 timeHandler = f;
 628                 timeStart = get_timer(0);
 629                 timeDelta = iv;
 630         }
 631 }
 632
 633
 634 void
 635 NetSendPacket(volatile uchar * pkt, int len)
 636 {
 637         (void) eth_send(pkt, len);
 638 }
 639
 640 int
 641 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
 642 {
 643         uchar *pkt;
 644
 645         /* convert to new style broadcast */
 646         if (dest == 0)
 647                 dest = 0xFFFFFFFF;
 648
 649         /* if broadcast, make the ether address a broadcast and don't do ARP */
 650         if (dest == 0xFFFFFFFF)
 651                 ether = NetBcastAddr;
 652
 653         /* if MAC address was not discovered yet, save the packet and do an ARP request */
 654         if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
 655
 656 #ifdef ET_DEBUG
 657                 printf("sending ARP for %08lx\n", dest);
 658 #endif
 659                 NetArpWaitPacketIP = dest;
 660                 NetArpWaitPacketMAC = ether;
 661
 662                 pkt = NetArpWaitTxPacket;
 663                 pkt += NetSetEther (pkt, NetArpWaitPacketMAC, PROT_IP);
 664
 665                 NetSetIP (pkt, dest, dport, sport, len);
 666                 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len);
 667
 668                 /* size of the waiting packet */
 669                 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE + len;
 670
 671                 /* and do the ARP request */
 672                 NetArpWaitTry = 1;
 673                 NetArpWaitTimerStart = get_timer(0);
 674                 ArpRequest();
 675                 return 1;       /* waiting */
 676         }
 677
 678 #ifdef ET_DEBUG
 679         printf("sending UDP to %08lx/%02x:%02x:%02x:%02x:%02x:%02x\n",
 680                 dest, ether[0], ether[1], ether[2], ether[3], ether[4], ether[5]);
 681 #endif
 682
 683         pkt = (uchar *)NetTxPacket;
 684         pkt += NetSetEther (pkt, ether, PROT_IP);
 685         NetSetIP (pkt, dest, dport, sport, len);
 686         (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len);
 687
 688         return 0;       /* transmitted */
 689 }
 690
 691 #if (CONFIG_COMMANDS & CFG_CMD_PING)
 692 static ushort PingSeqNo;
 693
 694 int PingSend(void)
 695 {
 696         static uchar mac[6];
 697         volatile IP_t *ip;
 698         volatile ushort *s;
 699         uchar *pkt;
 700
 701         /* XXX always send arp request */
 702
 703         memcpy(mac, NetEtherNullAddr, 6);
 704
 705 #ifdef ET_DEBUG
 706         printf("sending ARP for %08lx\n", NetPingIP);
 707 #endif
 708
 709         NetArpWaitPacketIP = NetPingIP;
 710         NetArpWaitPacketMAC = mac;
 711
 712         pkt = NetArpWaitTxPacket;
 713         pkt += NetSetEther(pkt, mac, PROT_IP);
 714
 715         ip = (volatile IP_t *)pkt;
 716
 717         /*
 718          *      Construct an IP and ICMP header.  (need to set no fragment bit - XXX)
 719          */
 720         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
 721         ip->ip_tos   = 0;
 722         ip->ip_len   = htons(IP_HDR_SIZE_NO_UDP + 8);
 723         ip->ip_id    = htons(NetIPID++);
 724         ip->ip_off   = htons(0x4000);   /* No fragmentation */
 725         ip->ip_ttl   = 255;
 726         ip->ip_p     = 0x01;            /* ICMP */
 727         ip->ip_sum   = 0;
 728         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
 729         NetCopyIP((void*)&ip->ip_dst, &NetPingIP);         /* - "" - */
 730         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
 731
 732         s = &ip->udp_src;               /* XXX ICMP starts here */
 733         s[0] = htons(0x0800);           /* echo-request, code */
 734         s[1] = 0;                       /* checksum */
 735         s[2] = 0;                       /* identifier */
 736         s[3] = htons(PingSeqNo++);      /* sequence number */
 737         s[1] = ~NetCksum((uchar *)s, 8/2);
 738
 739         /* size of the waiting packet */
 740         NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8;
 741
 742         /* and do the ARP request */
 743         NetArpWaitTry = 1;
 744         NetArpWaitTimerStart = get_timer(0);
 745         ArpRequest();
 746         return 1;       /* waiting */
 747 }
 748
 749 static void
 750 PingTimeout (void)
 751 {
 752         eth_halt();
 753         NetState = NETLOOP_FAIL;        /* we did not get the reply */
 754 }
 755
 756 static void
 757 PingHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
 758 {
 759         IPaddr_t tmp;
 760         volatile IP_t *ip = (volatile IP_t *)pkt;
 761
 762         tmp = NetReadIP((void *)&ip->ip_src);
 763         if (tmp != NetPingIP)
 764                 return;
 765
 766         NetState = NETLOOP_SUCCESS;
 767 }
 768
 769 static void PingStart(void)
 770 {
 771 #if defined(CONFIG_NET_MULTI)
 772         printf ("Using %s device\n", eth_get_name());
 773 #endif  /* CONFIG_NET_MULTI */
 774         NetSetTimeout (10 * CFG_HZ, PingTimeout);
 775         NetSetHandler (PingHandler);
 776
 777         PingSend();
 778 }
 779 #endif  /* CFG_CMD_PING */
 780
 781 #if (CONFIG_COMMANDS & CFG_CMD_CDP)
 782
 783 #define CDP_DEVICE_ID_TLV               0x0001
 784 #define CDP_ADDRESS_TLV                 0x0002
 785 #define CDP_PORT_ID_TLV                 0x0003
 786 #define CDP_CAPABILITIES_TLV            0x0004
 787 #define CDP_VERSION_TLV                 0x0005
 788 #define CDP_PLATFORM_TLV                0x0006
 789 #define CDP_NATIVE_VLAN_TLV             0x000a
 790 #define CDP_APPLIANCE_VLAN_TLV          0x000e
 791 #define CDP_TRIGGER_TLV                 0x000f
 792 #define CDP_POWER_CONSUMPTION_TLV       0x0010
 793 #define CDP_SYSNAME_TLV                 0x0014
 794 #define CDP_SYSOBJECT_TLV               0x0015
 795 #define CDP_MANAGEMENT_ADDRESS_TLV      0x0016
 796
 797 #define CDP_TIMEOUT                     (CFG_HZ/4)      /* one packet every 250ms */
 798
 799 static int CDPSeq;
 800 static int CDPOK;
 801
 802 ushort CDPNativeVLAN;
 803 ushort CDPApplianceVLAN;
 804
 805 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 0x00 };
 806
 807 static ushort CDP_compute_csum(const uchar *buff, ushort len)
 808 {
 809         ushort csum;
 810         int     odd;
 811         ulong   result = 0;
 812         ushort  leftover;
 813         ushort *p;
 814
 815         if (len > 0) {
 816                 odd = 1 & (ulong)buff;
 817                 if (odd) {
 818                         result = *buff << 8;
 819                         len--;
 820                         buff++;
 821                 }
 822                 while (len > 1) {
 823                         p = (ushort *)buff;
 824                         result += *p++;
 825                         buff = (uchar *)p;
 826                         if (result & 0x80000000)
 827                                 result = (result & 0xFFFF) + (result >> 16);
 828                         len -= 2;
 829                 }
 830                 if (len) {
 831                         leftover = (signed short)(*(const signed char *)buff);
 832                         /* * XXX CISCO SUCKS big time! (and blows too) */
 833                         result = (result & 0xffff0000) | ((result + leftover) & 0x0000ffff);
 834                 }
 835                 while (result >> 16)
 836                         result = (result & 0xFFFF) + (result >> 16);
 837
 838                 if (odd)
 839                         result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
 840         }
 841
 842         /* add up 16-bit and 17-bit words for 17+c bits */
 843         result = (result & 0xffff) + (result >> 16);
 844         /* add up 16-bit and 2-bit for 16+c bit */
 845         result = (result & 0xffff) + (result >> 16);
 846         /* add up carry.. */
 847         result = (result & 0xffff) + (result >> 16);
 848
 849         /* negate */
 850         csum = ~(ushort)result;
 851
 852         /* run time endian detection */
 853         if (csum != htons(csum))        /* little endian */
 854                 csum = htons(csum);
 855
 856         return csum;
 857 }
 858
 859 int CDPSendTrigger(void)
 860 {
 861         volatile uchar *pkt;
 862         volatile ushort *s;
 863         volatile ushort *cp;
 864         Ethernet_t *et;
 865         int len;
 866         ushort chksum;
 867 #if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID)   || \
 868     defined(CONFIG_CDP_VERSION)   || defined(CONFIG_CDP_PLATFORM)
 869         char buf[32];
 870 #endif
 871
 872         pkt = NetTxPacket;
 873         et = (Ethernet_t *)pkt;
 874
 875         /* NOTE: trigger sent not on any VLAN */
 876
 877         /* form ethernet header */
 878         memcpy(et->et_dest, NetCDPAddr, 6);
 879         memcpy(et->et_src, NetOurEther, 6);
 880
 881         pkt += ETHER_HDR_SIZE;
 882
 883         /* SNAP header */
 884         memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr));
 885         pkt += sizeof(CDP_SNAP_hdr);
 886
 887         /* CDP header */
 888         *pkt++ = 0x02;                          /* CDP version 2 */
 889         *pkt++ = 180;                           /* TTL */
 890         s = (volatile ushort *)pkt;
 891         cp = s;
 892         *s++ = htons(0);                        /* checksum (0 for later calculation) */
 893
 894         /* CDP fields */
 895 #ifdef CONFIG_CDP_DEVICE_ID
 896         *s++ = htons(CDP_DEVICE_ID_TLV);
 897         *s++ = htons(CONFIG_CDP_DEVICE_ID);
 898         memset(buf, 0, sizeof(buf));
 899         sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%02X%02X%02X%02X%02X%02X",
 900                 NetOurEther[0] & 0xff, NetOurEther[1] & 0xff,
 901                 NetOurEther[2] & 0xff, NetOurEther[3] & 0xff,
 902                 NetOurEther[4] & 0xff, NetOurEther[5] & 0xff);
 903         memcpy((uchar *)s, buf, 16);
 904         s += 16 / 2;
 905 #endif
 906
 907 #ifdef CONFIG_CDP_PORT_ID
 908         *s++ = htons(CDP_PORT_ID_TLV);
 909         memset(buf, 0, sizeof(buf));
 910         sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index());
 911         len = strlen(buf);
 912         if (len & 1)    /* make it even */
 913                 len++;
 914         *s++ = htons(len + 4);
 915         memcpy((uchar *)s, buf, len);
 916         s += len / 2;
 917 #endif
 918
 919 #ifdef CONFIG_CDP_CAPABILITIES
 920         *s++ = htons(CDP_CAPABILITIES_TLV);
 921         *s++ = htons(8);
 922         *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES);
 923         s += 2;
 924 #endif
 925
 926 #ifdef CONFIG_CDP_VERSION
 927         *s++ = htons(CDP_VERSION_TLV);
 928         memset(buf, 0, sizeof(buf));
 929         strcpy(buf, CONFIG_CDP_VERSION);
 930         len = strlen(buf);
 931         if (len & 1)    /* make it even */
 932                 len++;
 933         *s++ = htons(len + 4);
 934         memcpy((uchar *)s, buf, len);
 935         s += len / 2;
 936 #endif
 937
 938 #ifdef CONFIG_CDP_PLATFORM
 939         *s++ = htons(CDP_PLATFORM_TLV);
 940         memset(buf, 0, sizeof(buf));
 941         strcpy(buf, CONFIG_CDP_PLATFORM);
 942         len = strlen(buf);
 943         if (len & 1)    /* make it even */
 944                 len++;
 945         *s++ = htons(len + 4);
 946         memcpy((uchar *)s, buf, len);
 947         s += len / 2;
 948 #endif
 949
 950 #ifdef CONFIG_CDP_TRIGGER
 951         *s++ = htons(CDP_TRIGGER_TLV);
 952         *s++ = htons(8);
 953         *(ulong *)s = htonl(CONFIG_CDP_TRIGGER);
 954         s += 2;
 955 #endif
 956
 957 #ifdef CONFIG_CDP_POWER_CONSUMPTION
 958         *s++ = htons(CDP_POWER_CONSUMPTION_TLV);
 959         *s++ = htons(6);
 960         *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION);
 961 #endif
 962
 963         /* length of ethernet packet */
 964         len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE);
 965         et->et_protlen = htons(len);
 966
 967         len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr);
 968         chksum = CDP_compute_csum((uchar *)NetTxPacket + len, (uchar *)s - (NetTxPacket + len));
 969         if (chksum == 0)
 970                 chksum = 0xFFFF;
 971         *cp = htons(chksum);
 972
 973         (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket);
 974         return 0;
 975 }
 976
 977 static void
 978 CDPTimeout (void)
 979 {
 980         CDPSeq++;
 981
 982         if (CDPSeq < 3) {
 983                 NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
 984                 CDPSendTrigger();
 985                 return;
 986         }
 987
 988         /* if not OK try again */
 989         if (!CDPOK)
 990                 NetStartAgain();
 991         else
 992                 NetState = NETLOOP_SUCCESS;
 993 }
 994
 995 static void
 996 CDPDummyHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
 997 {
 998         /* nothing */
 999 }
1000
1001 static void
1002 CDPHandler(const uchar * pkt, unsigned len)
1003 {
1004         const uchar *t;
1005         const ushort *ss;
1006         ushort type, tlen;
1007         uchar applid;
1008         ushort vlan, nvlan;
1009
1010         /* minimum size? */
1011         if (len < sizeof(CDP_SNAP_hdr) + 4)
1012                 goto pkt_short;
1013
1014         /* check for valid CDP SNAP header */
1015         if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0)
1016                 return;
1017
1018         pkt += sizeof(CDP_SNAP_hdr);
1019         len -= sizeof(CDP_SNAP_hdr);
1020
1021         /* Version of CDP protocol must be >= 2 and TTL != 0 */
1022         if (pkt[0] < 0x02 || pkt[1] == 0)
1023                 return;
1024
1025         /* if version is greater than 0x02 maybe we'll have a problem; output a warning */
1026         if (pkt[0] != 0x02)
1027                 printf("** WARNING: CDP packet received with a protocol version %d > 2\n",
1028                                 pkt[0] & 0xff);
1029
1030         if (CDP_compute_csum(pkt, len) != 0)
1031                 return;
1032
1033         pkt += 4;
1034         len -= 4;
1035
1036         vlan = htons(-1);
1037         nvlan = htons(-1);
1038         while (len > 0) {
1039                 if (len < 4)
1040                         goto pkt_short;
1041
1042                 ss = (const ushort *)pkt;
1043                 type = ntohs(ss[0]);
1044                 tlen = ntohs(ss[1]);
1045                 if (tlen > len) {
1046                         goto pkt_short;
1047                 }
1048
1049                 pkt += tlen;
1050                 len -= tlen;
1051
1052                 ss += 2;        /* point ss to the data of the TLV */
1053                 tlen -= 4;
1054
1055                 switch (type) {
1056                         case CDP_DEVICE_ID_TLV:
1057                                 break;
1058                         case CDP_ADDRESS_TLV:
1059                                 break;
1060                         case CDP_PORT_ID_TLV:
1061                                 break;
1062                         case CDP_CAPABILITIES_TLV:
1063                                 break;
1064                         case CDP_VERSION_TLV:
1065                                 break;
1066                         case CDP_PLATFORM_TLV:
1067                                 break;
1068                         case CDP_NATIVE_VLAN_TLV:
1069                                 nvlan = *ss;
1070                                 break;
1071                         case CDP_APPLIANCE_VLAN_TLV:
1072                                 t = (const uchar *)ss;
1073                                 while (tlen > 0) {
1074                                         if (tlen < 3)
1075                                                 goto pkt_short;
1076
1077                                         applid = t[0];
1078                                         ss = (const ushort *)(t + 1);
1079
1080 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE
1081                                         if (applid == CONFIG_CDP_APPLIANCE_VLAN_TYPE)
1082                                                 vlan = *ss;
1083 #else
1084                                         vlan = ntohs(*ss);      /* XXX will this work; dunno */
1085 #endif
1086                                         t += 3; tlen -= 3;
1087                                 }
1088                                 break;
1089                         case CDP_TRIGGER_TLV:
1090                                 break;
1091                         case CDP_POWER_CONSUMPTION_TLV:
1092                                 break;
1093                         case CDP_SYSNAME_TLV:
1094                                 break;
1095                         case CDP_SYSOBJECT_TLV:
1096                                 break;
1097                         case CDP_MANAGEMENT_ADDRESS_TLV:
1098                                 break;
1099                 }
1100         }
1101
1102         CDPApplianceVLAN = vlan;
1103         CDPNativeVLAN = nvlan;
1104
1105         CDPOK = 1;
1106         return;
1107
1108  pkt_short:
1109         printf("** CDP packet is too short\n");
1110         return;
1111 }
1112
1113 static void CDPStart(void)
1114 {
1115 #if defined(CONFIG_NET_MULTI)
1116         printf ("Using %s device\n", eth_get_name());
1117 #endif
1118         CDPSeq = 0;
1119         CDPOK = 0;
1120
1121         CDPNativeVLAN = htons(-1);
1122         CDPApplianceVLAN = htons(-1);
1123
1124         NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
1125         NetSetHandler (CDPDummyHandler);
1126
1127         CDPSendTrigger();
1128 }
1129 #endif  /* CFG_CMD_CDP */
1130
1131
1132 void
1133 NetReceive(volatile uchar * inpkt, int len)
1134 {
1135         Ethernet_t *et;
1136         IP_t    *ip;
1137         ARP_t   *arp;
1138         IPaddr_t tmp;
1139         int     x;
1140         uchar *pkt;
1141 #if (CONFIG_COMMANDS & CFG_CMD_CDP)
1142         int iscdp;
1143 #endif
1144         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1145
1146 #ifdef ET_DEBUG
1147         printf("packet received\n");
1148 #endif
1149
1150         NetRxPkt = inpkt;
1151         NetRxPktLen = len;
1152         et = (Ethernet_t *)inpkt;
1153
1154         /* too small packet? */
1155         if (len < ETHER_HDR_SIZE)
1156                 return;
1157
1158 #if (CONFIG_COMMANDS & CFG_CMD_CDP)
1159         /* keep track if packet is CDP */
1160         iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0;
1161 #endif
1162
1163         myvlanid = ntohs(NetOurVLAN);
1164         if (myvlanid == (ushort)-1)
1165                 myvlanid = VLAN_NONE;
1166         mynvlanid = ntohs(NetOurNativeVLAN);
1167         if (mynvlanid == (ushort)-1)
1168                 mynvlanid = VLAN_NONE;
1169
1170         x = ntohs(et->et_protlen);
1171
1172 #ifdef ET_DEBUG
1173         printf("packet received\n");
1174 #endif
1175
1176         if (x < 1514) {
1177                 /*
1178                  *      Got a 802 packet.  Check the other protocol field.
1179                  */
1180                 x = ntohs(et->et_prot);
1181
1182                 ip = (IP_t *)(inpkt + E802_HDR_SIZE);
1183                 len -= E802_HDR_SIZE;
1184
1185         } else if (x != PROT_VLAN) {    /* normal packet */
1186                 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE);
1187                 len -= ETHER_HDR_SIZE;
1188
1189         } else {                        /* VLAN packet */
1190                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et;
1191
1192 #ifdef ET_DEBUG
1193                 printf("VLAN packet received\n");
1194 #endif
1195                 /* too small packet? */
1196                 if (len < VLAN_ETHER_HDR_SIZE)
1197                         return;
1198
1199                 /* if no VLAN active */
1200                 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
1201 #if (CONFIG_COMMANDS & CFG_CMD_CDP)
1202                                 && iscdp == 0
1203 #endif
1204                                 )
1205                         return;
1206
1207                 cti = ntohs(vet->vet_tag);
1208                 vlanid = cti & VLAN_IDMASK;
1209                 x = ntohs(vet->vet_type);
1210
1211                 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE);
1212                 len -= VLAN_ETHER_HDR_SIZE;
1213         }
1214
1215 #ifdef ET_DEBUG
1216         printf("Receive from protocol 0x%x\n", x);
1217 #endif
1218
1219 #if (CONFIG_COMMANDS & CFG_CMD_CDP)
1220         if (iscdp) {
1221                 CDPHandler((uchar *)ip, len);
1222                 return;
1223         }
1224 #endif
1225
1226         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1227                 if (vlanid == VLAN_NONE)
1228                         vlanid = (mynvlanid & VLAN_IDMASK);
1229                 /* not matched? */
1230                 if (vlanid != (myvlanid & VLAN_IDMASK))
1231                         return;
1232         }
1233
1234         switch (x) {
1235
1236         case PROT_ARP:
1237                 /*
1238                  * We have to deal with two types of ARP packets:
1239                  * - REQUEST packets will be answered by sending  our
1240                  *   IP address - if we know it.
1241                  * - REPLY packates are expected only after we asked
1242                  *   for the TFTP server's or the gateway's ethernet
1243                  *   address; so if we receive such a packet, we set
1244                  *   the server ethernet address
1245                  */
1246 #ifdef ET_DEBUG
1247                 puts ("Got ARP\n");
1248 #endif
1249                 arp = (ARP_t *)ip;
1250                 if (len < ARP_HDR_SIZE) {
1251                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1252                         return;
1253                 }
1254                 if (ntohs(arp->ar_hrd) != ARP_ETHER) {
1255                         return;
1256                 }
1257                 if (ntohs(arp->ar_pro) != PROT_IP) {
1258                         return;
1259                 }
1260                 if (arp->ar_hln != 6) {
1261                         return;
1262                 }
1263                 if (arp->ar_pln != 4) {
1264                         return;
1265                 }
1266
1267                 if (NetOurIP == 0) {
1268                         return;
1269                 }
1270
1271                 if (NetReadIP(&arp->ar_data[16]) != NetOurIP) {
1272                         return;
1273                 }
1274
1275                 switch (ntohs(arp->ar_op)) {
1276                 case ARPOP_REQUEST:             /* reply with our IP address    */
1277 #ifdef ET_DEBUG
1278                         puts ("Got ARP REQUEST, return our IP\n");
1279 #endif
1280                         pkt = (uchar *)et;
1281                         pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
1282                         arp->ar_op = htons(ARPOP_REPLY);
1283                         memcpy   (&arp->ar_data[10], &arp->ar_data[0], 6);
1284                         NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
1285                         memcpy   (&arp->ar_data[ 0], NetOurEther, 6);
1286                         NetCopyIP(&arp->ar_data[ 6], &NetOurIP);
1287                         (void) eth_send((uchar *)et, (pkt - (uchar *)et) + ARP_HDR_SIZE);
1288                         return;
1289
1290                 case ARPOP_REPLY:               /* arp reply */
1291                         /* are we waiting for a reply */
1292                         if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
1293                                 break;
1294 #ifdef ET_DEBUG
1295                         printf("Got ARP REPLY, set server/gtwy eth addr (%02x:%02x:%02x:%02x:%02x:%02x)\n",
1296                                 arp->ar_data[0], arp->ar_data[1],
1297                                 arp->ar_data[2], arp->ar_data[3],
1298                                 arp->ar_data[4], arp->ar_data[5]);
1299 #endif
1300
1301                         tmp = NetReadIP(&arp->ar_data[6]);
1302
1303                         /* matched waiting packet's address */
1304                         if (tmp == NetArpWaitReplyIP) {
1305 #ifdef ET_DEBUG
1306                                 puts ("Got it\n");
1307 #endif
1308                                 /* save address for later use */
1309                                 memcpy(NetArpWaitPacketMAC, &arp->ar_data[0], 6);
1310
1311 #ifdef CONFIG_NETCONSOLE
1312                                 (*packetHandler)(0,0,0,0);
1313 #endif
1314                                 /* modify header, and transmit it */
1315                                 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6);
1316                                 (void) eth_send(NetArpWaitTxPacket, NetArpWaitTxPacketSize);
1317
1318                                 /* no arp request pending now */
1319                                 NetArpWaitPacketIP = 0;
1320                                 NetArpWaitTxPacketSize = 0;
1321                                 NetArpWaitPacketMAC = NULL;
1322
1323                         }
1324                         return;
1325                 default:
1326 #ifdef ET_DEBUG
1327                         printf("Unexpected ARP opcode 0x%x\n", ntohs(arp->ar_op));
1328 #endif
1329                         return;
1330                 }
1331                 break;
1332
1333         case PROT_RARP:
1334 #ifdef ET_DEBUG
1335                 puts ("Got RARP\n");
1336 #endif
1337                 arp = (ARP_t *)ip;
1338                 if (len < ARP_HDR_SIZE) {
1339                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1340                         return;
1341                 }
1342
1343                 if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
1344                         (ntohs(arp->ar_hrd) != ARP_ETHER)   ||
1345                         (ntohs(arp->ar_pro) != PROT_IP)     ||
1346                         (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
1347
1348                         puts ("invalid RARP header\n");
1349                 } else {
1350                         NetCopyIP(&NetOurIP,    &arp->ar_data[16]);
1351                         if (NetServerIP == 0)
1352                                 NetCopyIP(&NetServerIP, &arp->ar_data[ 6]);
1353                         memcpy (NetServerEther, &arp->ar_data[ 0], 6);
1354
1355                         (*packetHandler)(0,0,0,0);
1356                 }
1357                 break;
1358
1359         case PROT_IP:
1360 #ifdef ET_DEBUG
1361                 puts ("Got IP\n");
1362 #endif
1363                 if (len < IP_HDR_SIZE) {
1364                         debug ("len bad %d < %d\n", len, IP_HDR_SIZE);
1365                         return;
1366                 }
1367                 if (len < ntohs(ip->ip_len)) {
1368                         printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
1369                         return;
1370                 }
1371                 len = ntohs(ip->ip_len);
1372 #ifdef ET_DEBUG
1373                 printf("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
1374 #endif
1375                 if ((ip->ip_hl_v & 0xf0) != 0x40) {
1376                         return;
1377                 }
1378                 if (ip->ip_off & htons(0x1fff)) { /* Can't deal w/ fragments */
1379                         return;
1380                 }
1381                 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
1382                         puts ("checksum bad\n");
1383                         return;
1384                 }
1385                 tmp = NetReadIP(&ip->ip_dst);
1386                 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
1387                         return;
1388                 }
1389                 /*
1390                  * watch for ICMP host redirects
1391                  *
1392                  * There is no real handler code (yet). We just watch
1393                  * for ICMP host redirect messages. In case anybody
1394                  * sees these messages: please contact me
1395                  * (wd@denx.de), or - even better - send me the
1396                  * necessary fixes :-)
1397                  *
1398                  * Note: in all cases where I have seen this so far
1399                  * it was a problem with the router configuration,
1400                  * for instance when a router was configured in the
1401                  * BOOTP reply, but the TFTP server was on the same
1402                  * subnet. So this is probably a warning that your
1403                  * configuration might be wrong. But I'm not really
1404                  * sure if there aren't any other situations.
1405                  */
1406                 if (ip->ip_p == IPPROTO_ICMP) {
1407                         ICMP_t *icmph = (ICMP_t *)&(ip->udp_src);
1408
1409                         switch (icmph->type) {
1410                         case ICMP_REDIRECT:
1411                                 if (icmph->code != ICMP_REDIR_HOST)
1412                                         return;
1413                                 puts (" ICMP Host Redirect to ");
1414                                 print_IPaddr(icmph->un.gateway);
1415                                 putc(' ');
1416                                 return;
1417 #if (CONFIG_COMMANDS & CFG_CMD_PING)
1418                         case ICMP_ECHO_REPLY:
1419                                 /*
1420                                  *      IP header OK.  Pass the packet to the current handler.
1421                                  */
1422                                 /* XXX point to ip packet */
1423                                 (*packetHandler)((uchar *)ip, 0, 0, 0);
1424                                 return;
1425 #endif
1426                         default:
1427                                 return;
1428                         }
1429                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1430                         return;
1431                 }
1432
1433 #ifdef CONFIG_UDP_CHECKSUM
1434                 if (ip->udp_xsum != 0) {
1435                         ulong   xsum;
1436                         ushort *sumptr;
1437                         ushort  sumlen;
1438
1439                         xsum  = ip->ip_p;
1440                         xsum += (ntohs(ip->udp_len));
1441                         xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
1442                         xsum += (ntohl(ip->ip_src) >>  0) & 0x0000ffff;
1443                         xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
1444                         xsum += (ntohl(ip->ip_dst) >>  0) & 0x0000ffff;
1445
1446                         sumlen = ntohs(ip->udp_len);
1447                         sumptr = (ushort *) &(ip->udp_src);
1448
1449                         while (sumlen > 1) {
1450                                 ushort sumdata;
1451
1452                                 sumdata = *sumptr++;
1453                                 xsum += ntohs(sumdata);
1454                                 sumlen -= 2;
1455                         }
1456                         if (sumlen > 0) {
1457                                 ushort sumdata;
1458
1459                                 sumdata = *(unsigned char *) sumptr;
1460                                 sumdata = (sumdata << 8) & 0xff00;
1461                                 xsum += sumdata;
1462                         }
1463                         while ((xsum >> 16) != 0) {
1464                                 xsum = (xsum & 0x0000ffff) + ((xsum >> 16) & 0x0000ffff);
1465                         }
1466                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1467                                 printf(" UDP wrong checksum %08x %08x\n", xsum, ntohs(ip->udp_xsum));
1468                                 return;
1469                         }
1470                 }
1471 #endif
1472
1473 #ifdef CONFIG_NETCONSOLE
1474                 nc_input_packet((uchar *)ip +IP_HDR_SIZE,
1475                                                 ntohs(ip->udp_dst),
1476                                                 ntohs(ip->udp_src),
1477                                                 ntohs(ip->udp_len) - 8);
1478 #endif
1479                 /*
1480                  *      IP header OK.  Pass the packet to the current handler.
1481                  */
1482                 (*packetHandler)((uchar *)ip +IP_HDR_SIZE,
1483                                                 ntohs(ip->udp_dst),
1484                                                 ntohs(ip->udp_src),
1485                                                 ntohs(ip->udp_len) - 8);
1486                 break;
1487         }
1488 }
1489
1490
1491 /**********************************************************************/
1492
1493 static int net_check_prereq (proto_t protocol)
1494 {
1495         switch (protocol) {
1496                 /* Fall through */
1497 #if (CONFIG_COMMANDS & CFG_CMD_PING)
1498         case PING:
1499                 if (NetPingIP == 0) {
1500                         puts ("*** ERROR: ping address not given\n");
1501                         return (1);
1502                 }
1503                 goto common;
1504 #endif
1505 #if (CONFIG_COMMANDS & CFG_CMD_SNTP)
1506         case SNTP:
1507                 if (NetNtpServerIP == 0) {
1508                         puts ("*** ERROR: NTP server address not given\n");
1509                         return (1);
1510                 }
1511                 goto common;
1512 #endif
1513 #if (CONFIG_COMMANDS & CFG_CMD_NFS)
1514         case NFS:
1515 #endif
1516         case NETCONS:
1517         case TFTP:
1518                 if (NetServerIP == 0) {
1519                         puts ("*** ERROR: `serverip' not set\n");
1520                         return (1);
1521                 }
1522 #if (CONFIG_COMMANDS & (CFG_CMD_PING | CFG_CMD_SNTP))
1523     common:
1524 #endif
1525
1526                 if (NetOurIP == 0) {
1527                         puts ("*** ERROR: `ipaddr' not set\n");
1528                         return (1);
1529                 }
1530                 /* Fall through */
1531
1532         case DHCP:
1533         case RARP:
1534         case BOOTP:
1535         case CDP:
1536                 if (memcmp (NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
1537 #ifdef CONFIG_NET_MULTI
1538                         extern int eth_get_dev_index (void);
1539                         int num = eth_get_dev_index ();
1540
1541                         switch (num) {
1542                         case -1:
1543                                 puts ("*** ERROR: No ethernet found.\n");
1544                                 return (1);
1545                         case 0:
1546                                 puts ("*** ERROR: `ethaddr' not set\n");
1547                                 break;
1548                         default:
1549                                 printf ("*** ERROR: `eth%daddr' not set\n",
1550                                         num);
1551                                 break;
1552                         }
1553
1554                         NetStartAgain ();
1555                         return (2);
1556 #else
1557                         puts ("*** ERROR: `ethaddr' not set\n");
1558                         return (1);
1559 #endif
1560                 }
1561                 /* Fall through */
1562         default:
1563                 return (0);
1564         }
1565         return (0);             /* OK */
1566 }
1567 /**********************************************************************/
1568
1569 int
1570 NetCksumOk(uchar * ptr, int len)
1571 {
1572         return !((NetCksum(ptr, len) + 1) & 0xfffe);
1573 }
1574
1575
1576 unsigned
1577 NetCksum(uchar * ptr, int len)
1578 {
1579         ulong   xsum;
1580         ushort *p = (ushort *)ptr;
1581
1582         xsum = 0;
1583         while (len-- > 0)
1584                 xsum += *p++;
1585         xsum = (xsum & 0xffff) + (xsum >> 16);
1586         xsum = (xsum & 0xffff) + (xsum >> 16);
1587         return (xsum & 0xffff);
1588 }
1589
1590 int
1591 NetEthHdrSize(void)
1592 {
1593         ushort myvlanid;
1594
1595         myvlanid = ntohs(NetOurVLAN);
1596         if (myvlanid == (ushort)-1)
1597                 myvlanid = VLAN_NONE;
1598
1599         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : VLAN_ETHER_HDR_SIZE;
1600 }
1601
1602 int
1603 NetSetEther(volatile uchar * xet, uchar * addr, uint prot)
1604 {
1605         Ethernet_t *et = (Ethernet_t *)xet;
1606         ushort myvlanid;
1607
1608         myvlanid = ntohs(NetOurVLAN);
1609         if (myvlanid == (ushort)-1)
1610                 myvlanid = VLAN_NONE;
1611
1612         memcpy (et->et_dest, addr, 6);
1613         memcpy (et->et_src, NetOurEther, 6);
1614         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1615         et->et_protlen = htons(prot);
1616                 return ETHER_HDR_SIZE;
1617         } else {
1618                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet;
1619
1620                 vet->vet_vlan_type = htons(PROT_VLAN);
1621                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1622                 vet->vet_type = htons(prot);
1623                 return VLAN_ETHER_HDR_SIZE;
1624         }
1625 }
1626
1627 void
1628 NetSetIP(volatile uchar * xip, IPaddr_t dest, int dport, int sport, int len)
1629 {
1630         volatile IP_t *ip = (IP_t *)xip;
1631
1632         /*
1633          *      If the data is an odd number of bytes, zero the
1634          *      byte after the last byte so that the checksum
1635          *      will work.
1636          */
1637         if (len & 1)
1638                 xip[IP_HDR_SIZE + len] = 0;
1639
1640         /*
1641          *      Construct an IP and UDP header.
1642          *      (need to set no fragment bit - XXX)
1643          */
1644         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
1645         ip->ip_tos   = 0;
1646         ip->ip_len   = htons(IP_HDR_SIZE + len);
1647         ip->ip_id    = htons(NetIPID++);
1648         ip->ip_off   = htons(0x4000);   /* No fragmentation */
1649         ip->ip_ttl   = 255;
1650         ip->ip_p     = 17;              /* UDP */
1651         ip->ip_sum   = 0;
1652         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
1653         NetCopyIP((void*)&ip->ip_dst, &dest);      /* - "" - */
1654         ip->udp_src  = htons(sport);
1655         ip->udp_dst  = htons(dport);
1656         ip->udp_len  = htons(8 + len);
1657         ip->udp_xsum = 0;
1658         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
1659 }
1660
1661 void copy_filename (char *dst, char *src, int size)
1662 {
1663         if (*src && (*src == '"')) {
1664                 ++src;
1665                 --size;
1666         }
1667
1668         while ((--size > 0) && *src && (*src != '"')) {
1669                 *dst++ = *src++;
1670         }
1671         *dst = '\0';
1672 }
1673
1674 #endif /* CFG_CMD_NET */
1675
1676 void ip_to_string (IPaddr_t x, char *s)
1677 {
1678         x = ntohl (x);
1679         sprintf (s, "%d.%d.%d.%d",
1680                  (int) ((x >> 24) & 0xff),
1681                  (int) ((x >> 16) & 0xff),
1682                  (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
1683         );
1684 }
1685
1686 IPaddr_t string_to_ip(char *s)
1687 {
1688         IPaddr_t addr;
1689         char *e;
1690         int i;
1691
1692         if (s == NULL)
1693                 return(0);
1694
1695         for (addr=0, i=0; i<4; ++i) {
1696                 ulong val = s ? simple_strtoul(s, &e, 10) : 0;
1697                 addr <<= 8;
1698                 addr |= (val & 0xFF);
1699                 if (s) {
1700                         s = (*e) ? e+1 : e;
1701                 }
1702         }
1703
1704         return (htonl(addr));
1705 }
1706
1707 void VLAN_to_string(ushort x, char *s)
1708 {
1709         x = ntohs(x);
1710
1711         if (x == (ushort)-1)
1712                 x = VLAN_NONE;
1713
1714         if (x == VLAN_NONE)
1715                 strcpy(s, "none");
1716         else
1717                 sprintf(s, "%d", x & VLAN_IDMASK);
1718 }
1719
1720 ushort string_to_VLAN(char *s)
1721 {
1722         ushort id;
1723
1724         if (s == NULL)
1725                 return htons(VLAN_NONE);
1726
1727         if (*s < '0' || *s > '9')
1728                 id = VLAN_NONE;
1729         else
1730                 id = (ushort)simple_strtoul(s, NULL, 10);
1731
1732         return htons(id);
1733 }
1734
1735 void print_IPaddr (IPaddr_t x)
1736 {
1737         char tmp[16];
1738
1739         ip_to_string (x, tmp);
1740
1741         puts (tmp);
1742 }
1743
1744 IPaddr_t getenv_IPaddr (char *var)
1745 {
1746         return (string_to_ip(getenv(var)));
1747 }
1748
1749 ushort getenv_VLAN(char *var)
1750 {
1751         return (string_to_VLAN(getenv(var)));
1752 }