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 defined(CONFIG_CMD_SNTP)
  90 #include "sntp.h"
  91 #endif
  92
  93 #if defined(CONFIG_CMD_NET)
  94
  95 DECLARE_GLOBAL_DATA_PTR;
  96
  97 #define ARP_TIMEOUT             5UL             /* Seconds before trying ARP again */
  98 #ifndef CONFIG_NET_RETRY_COUNT
  99 # define ARP_TIMEOUT_COUNT      5               /* # of timeouts before giving up  */
 100 #else
 101 # define ARP_TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT)
 102 #endif
 103
 104 #if 0
 105 #define ET_DEBUG
 106 #endif
 107
 108 /** BOOTP EXTENTIONS **/
 109
 110 IPaddr_t        NetOurSubnetMask=0;             /* Our subnet mask (0=unknown)  */
 111 IPaddr_t        NetOurGatewayIP=0;              /* Our gateways IP address      */
 112 IPaddr_t        NetOurDNSIP=0;                  /* Our DNS IP address           */
 113 #if defined(CONFIG_BOOTP_DNS2)
 114 IPaddr_t        NetOurDNS2IP=0;                 /* Our 2nd DNS IP address       */
 115 #endif
 116 char            NetOurNISDomain[32]={0,};       /* Our NIS domain               */
 117 char            NetOurHostName[32]={0,};        /* Our hostname                 */
 118 char            NetOurRootPath[64]={0,};        /* Our bootpath                 */
 119 ushort          NetBootFileSize=0;              /* Our bootfile size in blocks  */
 120
 121 #ifdef CONFIG_MCAST_TFTP        /* Multicast TFTP */
 122 IPaddr_t Mcast_addr;
 123 #endif
 124
 125 /** END OF BOOTP EXTENTIONS **/
 126
 127 ulong           NetBootFileXferSize;    /* The actual transferred size of the bootfile (in bytes) */
 128 uchar           NetOurEther[6];         /* Our ethernet address                 */
 129 uchar           NetServerEther[6] =     /* Boot server enet address             */
 130                         { 0, 0, 0, 0, 0, 0 };
 131 IPaddr_t        NetOurIP;               /* Our IP addr (0 = unknown)            */
 132 IPaddr_t        NetServerIP;            /* Our IP addr (0 = unknown)            */
 133 volatile uchar *NetRxPkt;               /* Current receive packet               */
 134 int             NetRxPktLen;            /* Current rx packet length             */
 135 unsigned        NetIPID;                /* IP packet ID                         */
 136 uchar           NetBcastAddr[6] =       /* Ethernet bcast address               */
 137                         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 138 uchar           NetEtherNullAddr[6] =
 139                         { 0, 0, 0, 0, 0, 0 };
 140 #if defined(CONFIG_CMD_CDP)
 141 uchar           NetCDPAddr[6] =         /* Ethernet bcast address               */
 142                         { 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc };
 143 #endif
 144 int             NetState;               /* Network loop state                   */
 145 #ifdef CONFIG_NET_MULTI
 146 int             NetRestartWrap = 0;     /* Tried all network devices            */
 147 static int      NetRestarted = 0;       /* Network loop restarted               */
 148 static int      NetDevExists = 0;       /* At least one device configured       */
 149 #endif
 150
 151 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
 152 ushort          NetOurVLAN = 0xFFFF;            /* default is without VLAN      */
 153 ushort          NetOurNativeVLAN = 0xFFFF;      /* ditto                        */
 154
 155 char            BootFile[128];          /* Boot File name                       */
 156
 157 #if defined(CONFIG_CMD_PING)
 158 IPaddr_t        NetPingIP;              /* the ip address to ping               */
 159
 160 static void PingStart(void);
 161 #endif
 162
 163 #if defined(CONFIG_CMD_CDP)
 164 static void CDPStart(void);
 165 #endif
 166
 167 #if defined(CONFIG_CMD_SNTP)
 168 IPaddr_t        NetNtpServerIP;         /* NTP server IP address                */
 169 int             NetTimeOffset=0;        /* offset time from UTC                 */
 170 #endif
 171
 172 #ifdef CONFIG_NETCONSOLE
 173 void NcStart(void);
 174 int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len);
 175 #endif
 176
 177 volatile uchar  PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 178
 179 volatile uchar *NetRxPackets[PKTBUFSRX]; /* Receive packets                     */
 180
 181 static rxhand_f *packetHandler;         /* Current RX packet handler            */
 182 static thand_f *timeHandler;            /* Current timeout handler              */
 183 static ulong    timeStart;              /* Time base value                      */
 184 static ulong    timeDelta;              /* Current timeout value                */
 185 volatile uchar *NetTxPacket = 0;        /* THE transmit packet                  */
 186
 187 static int net_check_prereq (proto_t protocol);
 188
 189 /**********************************************************************/
 190
 191 IPaddr_t        NetArpWaitPacketIP;
 192 IPaddr_t        NetArpWaitReplyIP;
 193 uchar          *NetArpWaitPacketMAC;    /* MAC address of waiting packet's destination  */
 194 uchar          *NetArpWaitTxPacket;     /* THE transmit packet                  */
 195 int             NetArpWaitTxPacketSize;
 196 uchar           NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
 197 ulong           NetArpWaitTimerStart;
 198 int             NetArpWaitTry;
 199
 200 void ArpRequest (void)
 201 {
 202         int i;
 203         volatile uchar *pkt;
 204         ARP_t *arp;
 205
 206 #ifdef ET_DEBUG
 207         printf ("ARP broadcast %d\n", NetArpWaitTry);
 208 #endif
 209         pkt = NetTxPacket;
 210
 211         pkt += NetSetEther (pkt, NetBcastAddr, PROT_ARP);
 212
 213         arp = (ARP_t *) pkt;
 214
 215         arp->ar_hrd = htons (ARP_ETHER);
 216         arp->ar_pro = htons (PROT_IP);
 217         arp->ar_hln = 6;
 218         arp->ar_pln = 4;
 219         arp->ar_op = htons (ARPOP_REQUEST);
 220
 221         memcpy (&arp->ar_data[0], NetOurEther, 6);              /* source ET addr       */
 222         NetWriteIP ((uchar *) & arp->ar_data[6], NetOurIP);     /* source IP addr       */
 223         for (i = 10; i < 16; ++i) {
 224                 arp->ar_data[i] = 0;                            /* dest ET addr = 0     */
 225         }
 226
 227         if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
 228             (NetOurIP & NetOurSubnetMask)) {
 229                 if (NetOurGatewayIP == 0) {
 230                         puts ("## Warning: gatewayip needed but not set\n");
 231                         NetArpWaitReplyIP = NetArpWaitPacketIP;
 232                 } else {
 233                         NetArpWaitReplyIP = NetOurGatewayIP;
 234                 }
 235         } else {
 236                 NetArpWaitReplyIP = NetArpWaitPacketIP;
 237         }
 238
 239         NetWriteIP ((uchar *) & arp->ar_data[16], NetArpWaitReplyIP);
 240         (void) eth_send (NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
 241 }
 242
 243 void ArpTimeoutCheck(void)
 244 {
 245         ulong t;
 246
 247         if (!NetArpWaitPacketIP)
 248                 return;
 249
 250         t = get_timer(0);
 251
 252         /* check for arp timeout */
 253         if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT * CFG_HZ) {
 254                 NetArpWaitTry++;
 255
 256                 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
 257                         puts ("\nARP Retry count exceeded; starting again\n");
 258                         NetArpWaitTry = 0;
 259                         NetStartAgain();
 260                 } else {
 261                         NetArpWaitTimerStart = t;
 262                         ArpRequest();
 263                 }
 264         }
 265 }
 266
 267 /**********************************************************************/
 268 /*
 269  *      Main network processing loop.
 270  */
 271
 272 int
 273 NetLoop(proto_t protocol)
 274 {
 275         bd_t *bd = gd->bd;
 276
 277 #ifdef CONFIG_NET_MULTI
 278         NetRestarted = 0;
 279         NetDevExists = 0;
 280 #endif
 281
 282         /* XXX problem with bss workaround */
 283         NetArpWaitPacketMAC = NULL;
 284         NetArpWaitTxPacket = NULL;
 285         NetArpWaitPacketIP = 0;
 286         NetArpWaitReplyIP = 0;
 287         NetArpWaitTxPacket = NULL;
 288         NetTxPacket = NULL;
 289
 290         if (!NetTxPacket) {
 291                 int     i;
 292                 /*
 293                  *      Setup packet buffers, aligned correctly.
 294                  */
 295                 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
 296                 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
 297                 for (i = 0; i < PKTBUFSRX; i++) {
 298                         NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
 299                 }
 300         }
 301
 302         if (!NetArpWaitTxPacket) {
 303                 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
 304                 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
 305                 NetArpWaitTxPacketSize = 0;
 306         }
 307
 308         eth_halt();
 309 #ifdef CONFIG_NET_MULTI
 310         eth_set_current();
 311 #endif
 312         if (eth_init(bd) < 0) {
 313                 eth_halt();
 314                 return(-1);
 315         }
 316
 317 restart:
 318 #ifdef CONFIG_NET_MULTI
 319         memcpy (NetOurEther, eth_get_dev()->enetaddr, 6);
 320 #else
 321         memcpy (NetOurEther, bd->bi_enetaddr, 6);
 322 #endif
 323
 324         NetState = NETLOOP_CONTINUE;
 325
 326         /*
 327          *      Start the ball rolling with the given start function.  From
 328          *      here on, this code is a state machine driven by received
 329          *      packets and timer events.
 330          */
 331
 332         switch (protocol) {
 333 #if defined(CONFIG_CMD_NFS)
 334         case NFS:
 335 #endif
 336 #if defined(CONFIG_CMD_PING)
 337         case PING:
 338 #endif
 339 #if defined(CONFIG_CMD_SNTP)
 340         case SNTP:
 341 #endif
 342         case NETCONS:
 343         case TFTP:
 344                 NetCopyIP(&NetOurIP, &bd->bi_ip_addr);
 345                 NetOurGatewayIP = getenv_IPaddr ("gatewayip");
 346                 NetOurSubnetMask= getenv_IPaddr ("netmask");
 347                 NetOurVLAN = getenv_VLAN("vlan");
 348                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 349
 350                 switch (protocol) {
 351 #if defined(CONFIG_CMD_NFS)
 352                 case NFS:
 353 #endif
 354                 case NETCONS:
 355                 case TFTP:
 356                         NetServerIP = getenv_IPaddr ("serverip");
 357                         break;
 358 #if defined(CONFIG_CMD_PING)
 359                 case PING:
 360                         /* nothing */
 361                         break;
 362 #endif
 363 #if defined(CONFIG_CMD_SNTP)
 364                 case SNTP:
 365                         /* nothing */
 366                         break;
 367 #endif
 368                 default:
 369                         break;
 370                 }
 371
 372                 break;
 373         case BOOTP:
 374         case RARP:
 375                 /*
 376                  * initialize our IP addr to 0 in order to accept ANY
 377                  * IP addr assigned to us by the BOOTP / RARP server
 378                  */
 379                 NetOurIP = 0;
 380                 NetServerIP = getenv_IPaddr ("serverip");
 381                 NetOurVLAN = getenv_VLAN("vlan");       /* VLANs must be read */
 382                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 383         case CDP:
 384                 NetOurVLAN = getenv_VLAN("vlan");       /* VLANs must be read */
 385                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 386                 break;
 387         default:
 388                 break;
 389         }
 390
 391         switch (net_check_prereq (protocol)) {
 392         case 1:
 393                 /* network not configured */
 394                 eth_halt();
 395                 return (-1);
 396
 397 #ifdef CONFIG_NET_MULTI
 398         case 2:
 399                 /* network device not configured */
 400                 break;
 401 #endif /* CONFIG_NET_MULTI */
 402
 403         case 0:
 404 #ifdef CONFIG_NET_MULTI
 405                 NetDevExists = 1;
 406 #endif
 407                 switch (protocol) {
 408                 case TFTP:
 409                         /* always use ARP to get server ethernet address */
 410                         TftpStart();
 411                         break;
 412
 413 #if defined(CONFIG_CMD_DHCP)
 414                 case DHCP:
 415                         /* Start with a clean slate... */
 416                         BootpTry = 0;
 417                         NetOurIP = 0;
 418                         NetServerIP = getenv_IPaddr ("serverip");
 419                         DhcpRequest();          /* Basically same as BOOTP */
 420                         break;
 421 #endif
 422
 423                 case BOOTP:
 424                         BootpTry = 0;
 425                         BootpRequest ();
 426                         break;
 427
 428                 case RARP:
 429                         RarpTry = 0;
 430                         RarpRequest ();
 431                         break;
 432 #if defined(CONFIG_CMD_PING)
 433                 case PING:
 434                         PingStart();
 435                         break;
 436 #endif
 437 #if defined(CONFIG_CMD_NFS)
 438                 case NFS:
 439                         NfsStart();
 440                         break;
 441 #endif
 442 #if defined(CONFIG_CMD_CDP)
 443                 case CDP:
 444                         CDPStart();
 445                         break;
 446 #endif
 447 #ifdef CONFIG_NETCONSOLE
 448                 case NETCONS:
 449                         NcStart();
 450                         break;
 451 #endif
 452 #if defined(CONFIG_CMD_SNTP)
 453                 case SNTP:
 454                         SntpStart();
 455                         break;
 456 #endif
 457                 default:
 458                         break;
 459                 }
 460
 461                 NetBootFileXferSize = 0;
 462                 break;
 463         }
 464
 465 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 466 #if defined(CFG_FAULT_ECHO_LINK_DOWN) && defined(CONFIG_STATUS_LED) && defined(STATUS_LED_RED)
 467         /*
 468          * Echo the inverted link state to the fault LED.
 469          */
 470         if(miiphy_link(eth_get_dev()->name, CFG_FAULT_MII_ADDR)) {
 471                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 472         } else {
 473                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 474         }
 475 #endif /* CFG_FAULT_ECHO_LINK_DOWN, ... */
 476 #endif /* CONFIG_MII, ... */
 477
 478         /*
 479          *      Main packet reception loop.  Loop receiving packets until
 480          *      someone sets `NetState' to a state that terminates.
 481          */
 482         for (;;) {
 483                 WATCHDOG_RESET();
 484 #ifdef CONFIG_SHOW_ACTIVITY
 485                 {
 486                         extern void show_activity(int arg);
 487                         show_activity(1);
 488                 }
 489 #endif
 490                 /*
 491                  *      Check the ethernet for a new packet.  The ethernet
 492                  *      receive routine will process it.
 493                  */
 494                         eth_rx();
 495
 496                 /*
 497                  *      Abort if ctrl-c was pressed.
 498                  */
 499                 if (ctrlc()) {
 500                         eth_halt();
 501                         puts ("\nAbort\n");
 502                         return (-1);
 503                 }
 504
 505                 ArpTimeoutCheck();
 506
 507                 /*
 508                  *      Check for a timeout, and run the timeout handler
 509                  *      if we have one.
 510                  */
 511                 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
 512                         thand_f *x;
 513
 514 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 515 #  if defined(CFG_FAULT_ECHO_LINK_DOWN) && \
 516       defined(CONFIG_STATUS_LED) &&        \
 517       defined(STATUS_LED_RED)
 518                         /*
 519                          * Echo the inverted link state to the fault LED.
 520                          */
 521                         if(miiphy_link(eth_get_dev()->name, CFG_FAULT_MII_ADDR)) {
 522                                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 523                         } else {
 524                                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 525                         }
 526 #  endif /* CFG_FAULT_ECHO_LINK_DOWN, ... */
 527 #endif /* CONFIG_MII, ... */
 528                         x = timeHandler;
 529                         timeHandler = (thand_f *)0;
 530                         (*x)();
 531                 }
 532
 533
 534                 switch (NetState) {
 535
 536                 case NETLOOP_RESTART:
 537 #ifdef CONFIG_NET_MULTI
 538                         NetRestarted = 1;
 539 #endif
 540                         goto restart;
 541
 542                 case NETLOOP_SUCCESS:
 543                         if (NetBootFileXferSize > 0) {
 544                                 char buf[20];
 545                                 printf("Bytes transferred = %ld (%lx hex)\n",
 546                                         NetBootFileXferSize,
 547                                         NetBootFileXferSize);
 548                                 sprintf(buf, "%lX", NetBootFileXferSize);
 549                                 setenv("filesize", buf);
 550
 551                                 sprintf(buf, "%lX", (unsigned long)load_addr);
 552                                 setenv("fileaddr", buf);
 553                         }
 554                         eth_halt();
 555                         return NetBootFileXferSize;
 556
 557                 case NETLOOP_FAIL:
 558                         return (-1);
 559                 }
 560         }
 561 }
 562
 563 /**********************************************************************/
 564
 565 static void
 566 startAgainTimeout(void)
 567 {
 568         NetState = NETLOOP_RESTART;
 569 }
 570
 571 static void
 572 startAgainHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
 573 {
 574         /* Totally ignore the packet */
 575 }
 576
 577 void NetStartAgain (void)
 578 {
 579         char *nretry;
 580         int noretry = 0, once = 0;
 581
 582         if ((nretry = getenv ("netretry")) != NULL) {
 583                 noretry = (strcmp (nretry, "no") == 0);
 584                 once = (strcmp (nretry, "once") == 0);
 585         }
 586         if (noretry) {
 587                 eth_halt ();
 588                 NetState = NETLOOP_FAIL;
 589                 return;
 590         }
 591 #ifndef CONFIG_NET_MULTI
 592         NetSetTimeout (10UL * CFG_HZ, startAgainTimeout);
 593         NetSetHandler (startAgainHandler);
 594 #else   /* !CONFIG_NET_MULTI*/
 595         eth_halt ();
 596         eth_try_another (!NetRestarted);
 597         eth_init (gd->bd);
 598         if (NetRestartWrap) {
 599                 NetRestartWrap = 0;
 600                 if (NetDevExists && !once) {
 601                         NetSetTimeout (10UL * CFG_HZ, startAgainTimeout);
 602                         NetSetHandler (startAgainHandler);
 603                 } else {
 604                         NetState = NETLOOP_FAIL;
 605                 }
 606         } else {
 607                 NetState = NETLOOP_RESTART;
 608         }
 609 #endif  /* CONFIG_NET_MULTI */
 610 }
 611
 612 /**********************************************************************/
 613 /*
 614  *      Miscelaneous bits.
 615  */
 616
 617 void
 618 NetSetHandler(rxhand_f * f)
 619 {
 620         packetHandler = f;
 621 }
 622
 623
 624 void
 625 NetSetTimeout(ulong iv, thand_f * f)
 626 {
 627         if (iv == 0) {
 628                 timeHandler = (thand_f *)0;
 629         } else {
 630                 timeHandler = f;
 631                 timeStart = get_timer(0);
 632                 timeDelta = iv;
 633         }
 634 }
 635
 636
 637 void
 638 NetSendPacket(volatile uchar * pkt, int len)
 639 {
 640         (void) eth_send(pkt, len);
 641 }
 642
 643 int
 644 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
 645 {
 646         uchar *pkt;
 647
 648         /* convert to new style broadcast */
 649         if (dest == 0)
 650                 dest = 0xFFFFFFFF;
 651
 652         /* if broadcast, make the ether address a broadcast and don't do ARP */
 653         if (dest == 0xFFFFFFFF)
 654                 ether = NetBcastAddr;
 655
 656         /* if MAC address was not discovered yet, save the packet and do an ARP request */
 657         if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
 658
 659 #ifdef ET_DEBUG
 660                 printf("sending ARP for %08lx\n", dest);
 661 #endif
 662                 NetArpWaitPacketIP = dest;
 663                 NetArpWaitPacketMAC = ether;
 664
 665                 pkt = NetArpWaitTxPacket;
 666                 pkt += NetSetEther (pkt, NetArpWaitPacketMAC, PROT_IP);
 667
 668                 NetSetIP (pkt, dest, dport, sport, len);
 669                 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len);
 670
 671                 /* size of the waiting packet */
 672                 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE + len;
 673
 674                 /* and do the ARP request */
 675                 NetArpWaitTry = 1;
 676                 NetArpWaitTimerStart = get_timer(0);
 677                 ArpRequest();
 678                 return 1;       /* waiting */
 679         }
 680
 681 #ifdef ET_DEBUG
 682         printf("sending UDP to %08lx/%02x:%02x:%02x:%02x:%02x:%02x\n",
 683                 dest, ether[0], ether[1], ether[2], ether[3], ether[4], ether[5]);
 684 #endif
 685
 686         pkt = (uchar *)NetTxPacket;
 687         pkt += NetSetEther (pkt, ether, PROT_IP);
 688         NetSetIP (pkt, dest, dport, sport, len);
 689         (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len);
 690
 691         return 0;       /* transmitted */
 692 }
 693
 694 #if defined(CONFIG_CMD_PING)
 695 static ushort PingSeqNo;
 696
 697 int PingSend(void)
 698 {
 699         static uchar mac[6];
 700         volatile IP_t *ip;
 701         volatile ushort *s;
 702         uchar *pkt;
 703
 704         /* XXX always send arp request */
 705
 706         memcpy(mac, NetEtherNullAddr, 6);
 707
 708 #ifdef ET_DEBUG
 709         printf("sending ARP for %08lx\n", NetPingIP);
 710 #endif
 711
 712         NetArpWaitPacketIP = NetPingIP;
 713         NetArpWaitPacketMAC = mac;
 714
 715         pkt = NetArpWaitTxPacket;
 716         pkt += NetSetEther(pkt, mac, PROT_IP);
 717
 718         ip = (volatile IP_t *)pkt;
 719
 720         /*
 721          *      Construct an IP and ICMP header.  (need to set no fragment bit - XXX)
 722          */
 723         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
 724         ip->ip_tos   = 0;
 725         ip->ip_len   = htons(IP_HDR_SIZE_NO_UDP + 8);
 726         ip->ip_id    = htons(NetIPID++);
 727         ip->ip_off   = htons(0x4000);   /* No fragmentation */
 728         ip->ip_ttl   = 255;
 729         ip->ip_p     = 0x01;            /* ICMP */
 730         ip->ip_sum   = 0;
 731         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
 732         NetCopyIP((void*)&ip->ip_dst, &NetPingIP);         /* - "" - */
 733         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
 734
 735         s = &ip->udp_src;               /* XXX ICMP starts here */
 736         s[0] = htons(0x0800);           /* echo-request, code */
 737         s[1] = 0;                       /* checksum */
 738         s[2] = 0;                       /* identifier */
 739         s[3] = htons(PingSeqNo++);      /* sequence number */
 740         s[1] = ~NetCksum((uchar *)s, 8/2);
 741
 742         /* size of the waiting packet */
 743         NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8;
 744
 745         /* and do the ARP request */
 746         NetArpWaitTry = 1;
 747         NetArpWaitTimerStart = get_timer(0);
 748         ArpRequest();
 749         return 1;       /* waiting */
 750 }
 751
 752 static void
 753 PingTimeout (void)
 754 {
 755         eth_halt();
 756         NetState = NETLOOP_FAIL;        /* we did not get the reply */
 757 }
 758
 759 static void
 760 PingHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
 761 {
 762         IPaddr_t tmp;
 763         volatile IP_t *ip = (volatile IP_t *)pkt;
 764
 765         tmp = NetReadIP((void *)&ip->ip_src);
 766         if (tmp != NetPingIP)
 767                 return;
 768
 769         NetState = NETLOOP_SUCCESS;
 770 }
 771
 772 static void PingStart(void)
 773 {
 774 #if defined(CONFIG_NET_MULTI)
 775         printf ("Using %s device\n", eth_get_name());
 776 #endif  /* CONFIG_NET_MULTI */
 777         NetSetTimeout (10UL * CFG_HZ, PingTimeout);
 778         NetSetHandler (PingHandler);
 779
 780         PingSend();
 781 }
 782 #endif
 783
 784 #if defined(CONFIG_CMD_CDP)
 785
 786 #define CDP_DEVICE_ID_TLV               0x0001
 787 #define CDP_ADDRESS_TLV                 0x0002
 788 #define CDP_PORT_ID_TLV                 0x0003
 789 #define CDP_CAPABILITIES_TLV            0x0004
 790 #define CDP_VERSION_TLV                 0x0005
 791 #define CDP_PLATFORM_TLV                0x0006
 792 #define CDP_NATIVE_VLAN_TLV             0x000a
 793 #define CDP_APPLIANCE_VLAN_TLV          0x000e
 794 #define CDP_TRIGGER_TLV                 0x000f
 795 #define CDP_POWER_CONSUMPTION_TLV       0x0010
 796 #define CDP_SYSNAME_TLV                 0x0014
 797 #define CDP_SYSOBJECT_TLV               0x0015
 798 #define CDP_MANAGEMENT_ADDRESS_TLV      0x0016
 799
 800 #define CDP_TIMEOUT                     (CFG_HZ/4)      /* one packet every 250ms */
 801
 802 static int CDPSeq;
 803 static int CDPOK;
 804
 805 ushort CDPNativeVLAN;
 806 ushort CDPApplianceVLAN;
 807
 808 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 0x00 };
 809
 810 static ushort CDP_compute_csum(const uchar *buff, ushort len)
 811 {
 812         ushort csum;
 813         int     odd;
 814         ulong   result = 0;
 815         ushort  leftover;
 816         ushort *p;
 817
 818         if (len > 0) {
 819                 odd = 1 & (ulong)buff;
 820                 if (odd) {
 821                         result = *buff << 8;
 822                         len--;
 823                         buff++;
 824                 }
 825                 while (len > 1) {
 826                         p = (ushort *)buff;
 827                         result += *p++;
 828                         buff = (uchar *)p;
 829                         if (result & 0x80000000)
 830                                 result = (result & 0xFFFF) + (result >> 16);
 831                         len -= 2;
 832                 }
 833                 if (len) {
 834                         leftover = (signed short)(*(const signed char *)buff);
 835                         /* CISCO SUCKS big time! (and blows too):
 836                          * CDP uses the IP checksum algorithm with a twist;
 837                          * for the last byte it *sign* extends and sums.
 838                          */
 839                         result = (result & 0xffff0000) | ((result + leftover) & 0x0000ffff);
 840                 }
 841                 while (result >> 16)
 842                         result = (result & 0xFFFF) + (result >> 16);
 843
 844                 if (odd)
 845                         result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
 846         }
 847
 848         /* add up 16-bit and 17-bit words for 17+c bits */
 849         result = (result & 0xffff) + (result >> 16);
 850         /* add up 16-bit and 2-bit for 16+c bit */
 851         result = (result & 0xffff) + (result >> 16);
 852         /* add up carry.. */
 853         result = (result & 0xffff) + (result >> 16);
 854
 855         /* negate */
 856         csum = ~(ushort)result;
 857
 858         /* run time endian detection */
 859         if (csum != htons(csum))        /* little endian */
 860                 csum = htons(csum);
 861
 862         return csum;
 863 }
 864
 865 int CDPSendTrigger(void)
 866 {
 867         volatile uchar *pkt;
 868         volatile ushort *s;
 869         volatile ushort *cp;
 870         Ethernet_t *et;
 871         int len;
 872         ushort chksum;
 873 #if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID)   || \
 874     defined(CONFIG_CDP_VERSION)   || defined(CONFIG_CDP_PLATFORM)
 875         char buf[32];
 876 #endif
 877
 878         pkt = NetTxPacket;
 879         et = (Ethernet_t *)pkt;
 880
 881         /* NOTE: trigger sent not on any VLAN */
 882
 883         /* form ethernet header */
 884         memcpy(et->et_dest, NetCDPAddr, 6);
 885         memcpy(et->et_src, NetOurEther, 6);
 886
 887         pkt += ETHER_HDR_SIZE;
 888
 889         /* SNAP header */
 890         memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr));
 891         pkt += sizeof(CDP_SNAP_hdr);
 892
 893         /* CDP header */
 894         *pkt++ = 0x02;                          /* CDP version 2 */
 895         *pkt++ = 180;                           /* TTL */
 896         s = (volatile ushort *)pkt;
 897         cp = s;
 898         *s++ = htons(0);                        /* checksum (0 for later calculation) */
 899
 900         /* CDP fields */
 901 #ifdef CONFIG_CDP_DEVICE_ID
 902         *s++ = htons(CDP_DEVICE_ID_TLV);
 903         *s++ = htons(CONFIG_CDP_DEVICE_ID);
 904         memset(buf, 0, sizeof(buf));
 905         sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%02X%02X%02X%02X%02X%02X",
 906                 NetOurEther[0] & 0xff, NetOurEther[1] & 0xff,
 907                 NetOurEther[2] & 0xff, NetOurEther[3] & 0xff,
 908                 NetOurEther[4] & 0xff, NetOurEther[5] & 0xff);
 909         memcpy((uchar *)s, buf, 16);
 910         s += 16 / 2;
 911 #endif
 912
 913 #ifdef CONFIG_CDP_PORT_ID
 914         *s++ = htons(CDP_PORT_ID_TLV);
 915         memset(buf, 0, sizeof(buf));
 916         sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index());
 917         len = strlen(buf);
 918         if (len & 1)    /* make it even */
 919                 len++;
 920         *s++ = htons(len + 4);
 921         memcpy((uchar *)s, buf, len);
 922         s += len / 2;
 923 #endif
 924
 925 #ifdef CONFIG_CDP_CAPABILITIES
 926         *s++ = htons(CDP_CAPABILITIES_TLV);
 927         *s++ = htons(8);
 928         *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES);
 929         s += 2;
 930 #endif
 931
 932 #ifdef CONFIG_CDP_VERSION
 933         *s++ = htons(CDP_VERSION_TLV);
 934         memset(buf, 0, sizeof(buf));
 935         strcpy(buf, CONFIG_CDP_VERSION);
 936         len = strlen(buf);
 937         if (len & 1)    /* make it even */
 938                 len++;
 939         *s++ = htons(len + 4);
 940         memcpy((uchar *)s, buf, len);
 941         s += len / 2;
 942 #endif
 943
 944 #ifdef CONFIG_CDP_PLATFORM
 945         *s++ = htons(CDP_PLATFORM_TLV);
 946         memset(buf, 0, sizeof(buf));
 947         strcpy(buf, CONFIG_CDP_PLATFORM);
 948         len = strlen(buf);
 949         if (len & 1)    /* make it even */
 950                 len++;
 951         *s++ = htons(len + 4);
 952         memcpy((uchar *)s, buf, len);
 953         s += len / 2;
 954 #endif
 955
 956 #ifdef CONFIG_CDP_TRIGGER
 957         *s++ = htons(CDP_TRIGGER_TLV);
 958         *s++ = htons(8);
 959         *(ulong *)s = htonl(CONFIG_CDP_TRIGGER);
 960         s += 2;
 961 #endif
 962
 963 #ifdef CONFIG_CDP_POWER_CONSUMPTION
 964         *s++ = htons(CDP_POWER_CONSUMPTION_TLV);
 965         *s++ = htons(6);
 966         *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION);
 967 #endif
 968
 969         /* length of ethernet packet */
 970         len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE);
 971         et->et_protlen = htons(len);
 972
 973         len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr);
 974         chksum = CDP_compute_csum((uchar *)NetTxPacket + len, (uchar *)s - (NetTxPacket + len));
 975         if (chksum == 0)
 976                 chksum = 0xFFFF;
 977         *cp = htons(chksum);
 978
 979         (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket);
 980         return 0;
 981 }
 982
 983 static void
 984 CDPTimeout (void)
 985 {
 986         CDPSeq++;
 987
 988         if (CDPSeq < 3) {
 989                 NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
 990                 CDPSendTrigger();
 991                 return;
 992         }
 993
 994         /* if not OK try again */
 995         if (!CDPOK)
 996                 NetStartAgain();
 997         else
 998                 NetState = NETLOOP_SUCCESS;
 999 }
1000
1001 static void
1002 CDPDummyHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
1003 {
1004         /* nothing */
1005 }
1006
1007 static void
1008 CDPHandler(const uchar * pkt, unsigned len)
1009 {
1010         const uchar *t;
1011         const ushort *ss;
1012         ushort type, tlen;
1013         uchar applid;
1014         ushort vlan, nvlan;
1015
1016         /* minimum size? */
1017         if (len < sizeof(CDP_SNAP_hdr) + 4)
1018                 goto pkt_short;
1019
1020         /* check for valid CDP SNAP header */
1021         if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0)
1022                 return;
1023
1024         pkt += sizeof(CDP_SNAP_hdr);
1025         len -= sizeof(CDP_SNAP_hdr);
1026
1027         /* Version of CDP protocol must be >= 2 and TTL != 0 */
1028         if (pkt[0] < 0x02 || pkt[1] == 0)
1029                 return;
1030
1031         /* if version is greater than 0x02 maybe we'll have a problem; output a warning */
1032         if (pkt[0] != 0x02)
1033                 printf("** WARNING: CDP packet received with a protocol version %d > 2\n",
1034                                 pkt[0] & 0xff);
1035
1036         if (CDP_compute_csum(pkt, len) != 0)
1037                 return;
1038
1039         pkt += 4;
1040         len -= 4;
1041
1042         vlan = htons(-1);
1043         nvlan = htons(-1);
1044         while (len > 0) {
1045                 if (len < 4)
1046                         goto pkt_short;
1047
1048                 ss = (const ushort *)pkt;
1049                 type = ntohs(ss[0]);
1050                 tlen = ntohs(ss[1]);
1051                 if (tlen > len) {
1052                         goto pkt_short;
1053                 }
1054
1055                 pkt += tlen;
1056                 len -= tlen;
1057
1058                 ss += 2;        /* point ss to the data of the TLV */
1059                 tlen -= 4;
1060
1061                 switch (type) {
1062                         case CDP_DEVICE_ID_TLV:
1063                                 break;
1064                         case CDP_ADDRESS_TLV:
1065                                 break;
1066                         case CDP_PORT_ID_TLV:
1067                                 break;
1068                         case CDP_CAPABILITIES_TLV:
1069                                 break;
1070                         case CDP_VERSION_TLV:
1071                                 break;
1072                         case CDP_PLATFORM_TLV:
1073                                 break;
1074                         case CDP_NATIVE_VLAN_TLV:
1075                                 nvlan = *ss;
1076                                 break;
1077                         case CDP_APPLIANCE_VLAN_TLV:
1078                                 t = (const uchar *)ss;
1079                                 while (tlen > 0) {
1080                                         if (tlen < 3)
1081                                                 goto pkt_short;
1082
1083                                         applid = t[0];
1084                                         ss = (const ushort *)(t + 1);
1085
1086 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE
1087                                         if (applid == CONFIG_CDP_APPLIANCE_VLAN_TYPE)
1088                                                 vlan = *ss;
1089 #else
1090                                         vlan = ntohs(*ss);      /* XXX will this work; dunno */
1091 #endif
1092                                         t += 3; tlen -= 3;
1093                                 }
1094                                 break;
1095                         case CDP_TRIGGER_TLV:
1096                                 break;
1097                         case CDP_POWER_CONSUMPTION_TLV:
1098                                 break;
1099                         case CDP_SYSNAME_TLV:
1100                                 break;
1101                         case CDP_SYSOBJECT_TLV:
1102                                 break;
1103                         case CDP_MANAGEMENT_ADDRESS_TLV:
1104                                 break;
1105                 }
1106         }
1107
1108         CDPApplianceVLAN = vlan;
1109         CDPNativeVLAN = nvlan;
1110
1111         CDPOK = 1;
1112         return;
1113
1114  pkt_short:
1115         printf("** CDP packet is too short\n");
1116         return;
1117 }
1118
1119 static void CDPStart(void)
1120 {
1121 #if defined(CONFIG_NET_MULTI)
1122         printf ("Using %s device\n", eth_get_name());
1123 #endif
1124         CDPSeq = 0;
1125         CDPOK = 0;
1126
1127         CDPNativeVLAN = htons(-1);
1128         CDPApplianceVLAN = htons(-1);
1129
1130         NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
1131         NetSetHandler (CDPDummyHandler);
1132
1133         CDPSendTrigger();
1134 }
1135 #endif
1136
1137
1138 void
1139 NetReceive(volatile uchar * inpkt, int len)
1140 {
1141         Ethernet_t *et;
1142         IP_t    *ip;
1143         ARP_t   *arp;
1144         IPaddr_t tmp;
1145         int     x;
1146         uchar *pkt;
1147 #if defined(CONFIG_CMD_CDP)
1148         int iscdp;
1149 #endif
1150         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1151
1152 #ifdef ET_DEBUG
1153         printf("packet received\n");
1154 #endif
1155
1156         NetRxPkt = inpkt;
1157         NetRxPktLen = len;
1158         et = (Ethernet_t *)inpkt;
1159
1160         /* too small packet? */
1161         if (len < ETHER_HDR_SIZE)
1162                 return;
1163
1164 #if defined(CONFIG_CMD_CDP)
1165         /* keep track if packet is CDP */
1166         iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0;
1167 #endif
1168
1169         myvlanid = ntohs(NetOurVLAN);
1170         if (myvlanid == (ushort)-1)
1171                 myvlanid = VLAN_NONE;
1172         mynvlanid = ntohs(NetOurNativeVLAN);
1173         if (mynvlanid == (ushort)-1)
1174                 mynvlanid = VLAN_NONE;
1175
1176         x = ntohs(et->et_protlen);
1177
1178 #ifdef ET_DEBUG
1179         printf("packet received\n");
1180 #endif
1181
1182         if (x < 1514) {
1183                 /*
1184                  *      Got a 802 packet.  Check the other protocol field.
1185                  */
1186                 x = ntohs(et->et_prot);
1187
1188                 ip = (IP_t *)(inpkt + E802_HDR_SIZE);
1189                 len -= E802_HDR_SIZE;
1190
1191         } else if (x != PROT_VLAN) {    /* normal packet */
1192                 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE);
1193                 len -= ETHER_HDR_SIZE;
1194
1195         } else {                        /* VLAN packet */
1196                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et;
1197
1198 #ifdef ET_DEBUG
1199                 printf("VLAN packet received\n");
1200 #endif
1201                 /* too small packet? */
1202                 if (len < VLAN_ETHER_HDR_SIZE)
1203                         return;
1204
1205                 /* if no VLAN active */
1206                 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
1207 #if defined(CONFIG_CMD_CDP)
1208                                 && iscdp == 0
1209 #endif
1210                                 )
1211                         return;
1212
1213                 cti = ntohs(vet->vet_tag);
1214                 vlanid = cti & VLAN_IDMASK;
1215                 x = ntohs(vet->vet_type);
1216
1217                 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE);
1218                 len -= VLAN_ETHER_HDR_SIZE;
1219         }
1220
1221 #ifdef ET_DEBUG
1222         printf("Receive from protocol 0x%x\n", x);
1223 #endif
1224
1225 #if defined(CONFIG_CMD_CDP)
1226         if (iscdp) {
1227                 CDPHandler((uchar *)ip, len);
1228                 return;
1229         }
1230 #endif
1231
1232         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1233                 if (vlanid == VLAN_NONE)
1234                         vlanid = (mynvlanid & VLAN_IDMASK);
1235                 /* not matched? */
1236                 if (vlanid != (myvlanid & VLAN_IDMASK))
1237                         return;
1238         }
1239
1240         switch (x) {
1241
1242         case PROT_ARP:
1243                 /*
1244                  * We have to deal with two types of ARP packets:
1245                  * - REQUEST packets will be answered by sending  our
1246                  *   IP address - if we know it.
1247                  * - REPLY packates are expected only after we asked
1248                  *   for the TFTP server's or the gateway's ethernet
1249                  *   address; so if we receive such a packet, we set
1250                  *   the server ethernet address
1251                  */
1252 #ifdef ET_DEBUG
1253                 puts ("Got ARP\n");
1254 #endif
1255                 arp = (ARP_t *)ip;
1256                 if (len < ARP_HDR_SIZE) {
1257                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1258                         return;
1259                 }
1260                 if (ntohs(arp->ar_hrd) != ARP_ETHER) {
1261                         return;
1262                 }
1263                 if (ntohs(arp->ar_pro) != PROT_IP) {
1264                         return;
1265                 }
1266                 if (arp->ar_hln != 6) {
1267                         return;
1268                 }
1269                 if (arp->ar_pln != 4) {
1270                         return;
1271                 }
1272
1273                 if (NetOurIP == 0) {
1274                         return;
1275                 }
1276
1277                 if (NetReadIP(&arp->ar_data[16]) != NetOurIP) {
1278                         return;
1279                 }
1280
1281                 switch (ntohs(arp->ar_op)) {
1282                 case ARPOP_REQUEST:             /* reply with our IP address    */
1283 #ifdef ET_DEBUG
1284                         puts ("Got ARP REQUEST, return our IP\n");
1285 #endif
1286                         pkt = (uchar *)et;
1287                         pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
1288                         arp->ar_op = htons(ARPOP_REPLY);
1289                         memcpy   (&arp->ar_data[10], &arp->ar_data[0], 6);
1290                         NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
1291                         memcpy   (&arp->ar_data[ 0], NetOurEther, 6);
1292                         NetCopyIP(&arp->ar_data[ 6], &NetOurIP);
1293                         (void) eth_send((uchar *)et, (pkt - (uchar *)et) + ARP_HDR_SIZE);
1294                         return;
1295
1296                 case ARPOP_REPLY:               /* arp reply */
1297                         /* are we waiting for a reply */
1298                         if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
1299                                 break;
1300 #ifdef ET_DEBUG
1301                         printf("Got ARP REPLY, set server/gtwy eth addr (%02x:%02x:%02x:%02x:%02x:%02x)\n",
1302                                 arp->ar_data[0], arp->ar_data[1],
1303                                 arp->ar_data[2], arp->ar_data[3],
1304                                 arp->ar_data[4], arp->ar_data[5]);
1305 #endif
1306
1307                         tmp = NetReadIP(&arp->ar_data[6]);
1308
1309                         /* matched waiting packet's address */
1310                         if (tmp == NetArpWaitReplyIP) {
1311 #ifdef ET_DEBUG
1312                                 puts ("Got it\n");
1313 #endif
1314                                 /* save address for later use */
1315                                 memcpy(NetArpWaitPacketMAC, &arp->ar_data[0], 6);
1316
1317 #ifdef CONFIG_NETCONSOLE
1318                                 (*packetHandler)(0,0,0,0);
1319 #endif
1320                                 /* modify header, and transmit it */
1321                                 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6);
1322                                 (void) eth_send(NetArpWaitTxPacket, NetArpWaitTxPacketSize);
1323
1324                                 /* no arp request pending now */
1325                                 NetArpWaitPacketIP = 0;
1326                                 NetArpWaitTxPacketSize = 0;
1327                                 NetArpWaitPacketMAC = NULL;
1328
1329                         }
1330                         return;
1331                 default:
1332 #ifdef ET_DEBUG
1333                         printf("Unexpected ARP opcode 0x%x\n", ntohs(arp->ar_op));
1334 #endif
1335                         return;
1336                 }
1337                 break;
1338
1339         case PROT_RARP:
1340 #ifdef ET_DEBUG
1341                 puts ("Got RARP\n");
1342 #endif
1343                 arp = (ARP_t *)ip;
1344                 if (len < ARP_HDR_SIZE) {
1345                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1346                         return;
1347                 }
1348
1349                 if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
1350                         (ntohs(arp->ar_hrd) != ARP_ETHER)   ||
1351                         (ntohs(arp->ar_pro) != PROT_IP)     ||
1352                         (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
1353
1354                         puts ("invalid RARP header\n");
1355                 } else {
1356                         NetCopyIP(&NetOurIP,    &arp->ar_data[16]);
1357                         if (NetServerIP == 0)
1358                                 NetCopyIP(&NetServerIP, &arp->ar_data[ 6]);
1359                         memcpy (NetServerEther, &arp->ar_data[ 0], 6);
1360
1361                         (*packetHandler)(0,0,0,0);
1362                 }
1363                 break;
1364
1365         case PROT_IP:
1366 #ifdef ET_DEBUG
1367                 puts ("Got IP\n");
1368 #endif
1369                 if (len < IP_HDR_SIZE) {
1370                         debug ("len bad %d < %d\n", len, IP_HDR_SIZE);
1371                         return;
1372                 }
1373                 if (len < ntohs(ip->ip_len)) {
1374                         printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
1375                         return;
1376                 }
1377                 len = ntohs(ip->ip_len);
1378 #ifdef ET_DEBUG
1379                 printf("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
1380 #endif
1381                 if ((ip->ip_hl_v & 0xf0) != 0x40) {
1382                         return;
1383                 }
1384                 if (ip->ip_off & htons(0x1fff)) { /* Can't deal w/ fragments */
1385                         return;
1386                 }
1387                 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
1388                         puts ("checksum bad\n");
1389                         return;
1390                 }
1391                 tmp = NetReadIP(&ip->ip_dst);
1392                 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
1393 #ifdef CONFIG_MCAST_TFTP
1394                         if (Mcast_addr != tmp)
1395 #endif
1396                         return;
1397                 }
1398                 /*
1399                  * watch for ICMP host redirects
1400                  *
1401                  * There is no real handler code (yet). We just watch
1402                  * for ICMP host redirect messages. In case anybody
1403                  * sees these messages: please contact me
1404                  * (wd@denx.de), or - even better - send me the
1405                  * necessary fixes :-)
1406                  *
1407                  * Note: in all cases where I have seen this so far
1408                  * it was a problem with the router configuration,
1409                  * for instance when a router was configured in the
1410                  * BOOTP reply, but the TFTP server was on the same
1411                  * subnet. So this is probably a warning that your
1412                  * configuration might be wrong. But I'm not really
1413                  * sure if there aren't any other situations.
1414                  */
1415                 if (ip->ip_p == IPPROTO_ICMP) {
1416                         ICMP_t *icmph = (ICMP_t *)&(ip->udp_src);
1417
1418                         switch (icmph->type) {
1419                         case ICMP_REDIRECT:
1420                                 if (icmph->code != ICMP_REDIR_HOST)
1421                                         return;
1422                                 puts (" ICMP Host Redirect to ");
1423                                 print_IPaddr(icmph->un.gateway);
1424                                 putc(' ');
1425                                 return;
1426 #if defined(CONFIG_CMD_PING)
1427                         case ICMP_ECHO_REPLY:
1428                                 /*
1429                                  *      IP header OK.  Pass the packet to the current handler.
1430                                  */
1431                                 /* XXX point to ip packet */
1432                                 (*packetHandler)((uchar *)ip, 0, 0, 0);
1433                                 return;
1434                         case ICMP_ECHO_REQUEST:
1435 #ifdef ET_DEBUG
1436                                 printf ("Got ICMP ECHO REQUEST, return %d bytes \n",
1437                                         ETHER_HDR_SIZE + len);
1438 #endif
1439                                 memcpy (&et->et_dest[0], &et->et_src[0], 6);
1440                                 memcpy (&et->et_src[ 0], NetOurEther, 6);
1441
1442                                 ip->ip_sum = 0;
1443                                 ip->ip_off = 0;
1444                                 NetCopyIP((void*)&ip->ip_dst, &ip->ip_src);
1445                                 NetCopyIP((void*)&ip->ip_src, &NetOurIP);
1446                                 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP >> 1);
1447
1448                                 icmph->type = ICMP_ECHO_REPLY;
1449                                 icmph->checksum = 0;
1450                                 icmph->checksum = ~NetCksum((uchar *)icmph,
1451                                                 (len - IP_HDR_SIZE_NO_UDP) >> 1);
1452                                 (void) eth_send((uchar *)et, ETHER_HDR_SIZE + len);
1453                                 return;
1454 #endif
1455                         default:
1456                                 return;
1457                         }
1458                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1459                         return;
1460                 }
1461
1462 #ifdef CONFIG_UDP_CHECKSUM
1463                 if (ip->udp_xsum != 0) {
1464                         ulong   xsum;
1465                         ushort *sumptr;
1466                         ushort  sumlen;
1467
1468                         xsum  = ip->ip_p;
1469                         xsum += (ntohs(ip->udp_len));
1470                         xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
1471                         xsum += (ntohl(ip->ip_src) >>  0) & 0x0000ffff;
1472                         xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
1473                         xsum += (ntohl(ip->ip_dst) >>  0) & 0x0000ffff;
1474
1475                         sumlen = ntohs(ip->udp_len);
1476                         sumptr = (ushort *) &(ip->udp_src);
1477
1478                         while (sumlen > 1) {
1479                                 ushort sumdata;
1480
1481                                 sumdata = *sumptr++;
1482                                 xsum += ntohs(sumdata);
1483                                 sumlen -= 2;
1484                         }
1485                         if (sumlen > 0) {
1486                                 ushort sumdata;
1487
1488                                 sumdata = *(unsigned char *) sumptr;
1489                                 sumdata = (sumdata << 8) & 0xff00;
1490                                 xsum += sumdata;
1491                         }
1492                         while ((xsum >> 16) != 0) {
1493                                 xsum = (xsum & 0x0000ffff) + ((xsum >> 16) & 0x0000ffff);
1494                         }
1495                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1496                                 printf(" UDP wrong checksum %08x %08x\n", xsum, ntohs(ip->udp_xsum));
1497                                 return;
1498                         }
1499                 }
1500 #endif
1501
1502
1503 #ifdef CONFIG_NETCONSOLE
1504                 nc_input_packet((uchar *)ip +IP_HDR_SIZE,
1505                                                 ntohs(ip->udp_dst),
1506                                                 ntohs(ip->udp_src),
1507                                                 ntohs(ip->udp_len) - 8);
1508 #endif
1509                 /*
1510                  *      IP header OK.  Pass the packet to the current handler.
1511                  */
1512                 (*packetHandler)((uchar *)ip +IP_HDR_SIZE,
1513                                                 ntohs(ip->udp_dst),
1514                                                 ntohs(ip->udp_src),
1515                                                 ntohs(ip->udp_len) - 8);
1516                 break;
1517         }
1518 }
1519
1520
1521 /**********************************************************************/
1522
1523 static int net_check_prereq (proto_t protocol)
1524 {
1525         switch (protocol) {
1526                 /* Fall through */
1527 #if defined(CONFIG_CMD_PING)
1528         case PING:
1529                 if (NetPingIP == 0) {
1530                         puts ("*** ERROR: ping address not given\n");
1531                         return (1);
1532                 }
1533                 goto common;
1534 #endif
1535 #if defined(CONFIG_CMD_SNTP)
1536         case SNTP:
1537                 if (NetNtpServerIP == 0) {
1538                         puts ("*** ERROR: NTP server address not given\n");
1539                         return (1);
1540                 }
1541                 goto common;
1542 #endif
1543 #if defined(CONFIG_CMD_NFS)
1544         case NFS:
1545 #endif
1546         case NETCONS:
1547         case TFTP:
1548                 if (NetServerIP == 0) {
1549                         puts ("*** ERROR: `serverip' not set\n");
1550                         return (1);
1551                 }
1552 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP)
1553     common:
1554 #endif
1555
1556                 if (NetOurIP == 0) {
1557                         puts ("*** ERROR: `ipaddr' not set\n");
1558                         return (1);
1559                 }
1560                 /* Fall through */
1561
1562         case DHCP:
1563         case RARP:
1564         case BOOTP:
1565         case CDP:
1566                 if (memcmp (NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
1567 #ifdef CONFIG_NET_MULTI
1568                         extern int eth_get_dev_index (void);
1569                         int num = eth_get_dev_index ();
1570
1571                         switch (num) {
1572                         case -1:
1573                                 puts ("*** ERROR: No ethernet found.\n");
1574                                 return (1);
1575                         case 0:
1576                                 puts ("*** ERROR: `ethaddr' not set\n");
1577                                 break;
1578                         default:
1579                                 printf ("*** ERROR: `eth%daddr' not set\n",
1580                                         num);
1581                                 break;
1582                         }
1583
1584                         NetStartAgain ();
1585                         return (2);
1586 #else
1587                         puts ("*** ERROR: `ethaddr' not set\n");
1588                         return (1);
1589 #endif
1590                 }
1591                 /* Fall through */
1592         default:
1593                 return (0);
1594         }
1595         return (0);             /* OK */
1596 }
1597 /**********************************************************************/
1598
1599 int
1600 NetCksumOk(uchar * ptr, int len)
1601 {
1602         return !((NetCksum(ptr, len) + 1) & 0xfffe);
1603 }
1604
1605
1606 unsigned
1607 NetCksum(uchar * ptr, int len)
1608 {
1609         ulong   xsum;
1610         ushort *p = (ushort *)ptr;
1611
1612         xsum = 0;
1613         while (len-- > 0)
1614                 xsum += *p++;
1615         xsum = (xsum & 0xffff) + (xsum >> 16);
1616         xsum = (xsum & 0xffff) + (xsum >> 16);
1617         return (xsum & 0xffff);
1618 }
1619
1620 int
1621 NetEthHdrSize(void)
1622 {
1623         ushort myvlanid;
1624
1625         myvlanid = ntohs(NetOurVLAN);
1626         if (myvlanid == (ushort)-1)
1627                 myvlanid = VLAN_NONE;
1628
1629         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : VLAN_ETHER_HDR_SIZE;
1630 }
1631
1632 int
1633 NetSetEther(volatile uchar * xet, uchar * addr, uint prot)
1634 {
1635         Ethernet_t *et = (Ethernet_t *)xet;
1636         ushort myvlanid;
1637
1638         myvlanid = ntohs(NetOurVLAN);
1639         if (myvlanid == (ushort)-1)
1640                 myvlanid = VLAN_NONE;
1641
1642         memcpy (et->et_dest, addr, 6);
1643         memcpy (et->et_src, NetOurEther, 6);
1644         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1645         et->et_protlen = htons(prot);
1646                 return ETHER_HDR_SIZE;
1647         } else {
1648                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet;
1649
1650                 vet->vet_vlan_type = htons(PROT_VLAN);
1651                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1652                 vet->vet_type = htons(prot);
1653                 return VLAN_ETHER_HDR_SIZE;
1654         }
1655 }
1656
1657 void
1658 NetSetIP(volatile uchar * xip, IPaddr_t dest, int dport, int sport, int len)
1659 {
1660         volatile IP_t *ip = (IP_t *)xip;
1661
1662         /*
1663          *      If the data is an odd number of bytes, zero the
1664          *      byte after the last byte so that the checksum
1665          *      will work.
1666          */
1667         if (len & 1)
1668                 xip[IP_HDR_SIZE + len] = 0;
1669
1670         /*
1671          *      Construct an IP and UDP header.
1672          *      (need to set no fragment bit - XXX)
1673          */
1674         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
1675         ip->ip_tos   = 0;
1676         ip->ip_len   = htons(IP_HDR_SIZE + len);
1677         ip->ip_id    = htons(NetIPID++);
1678         ip->ip_off   = htons(0x4000);   /* No fragmentation */
1679         ip->ip_ttl   = 255;
1680         ip->ip_p     = 17;              /* UDP */
1681         ip->ip_sum   = 0;
1682         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
1683         NetCopyIP((void*)&ip->ip_dst, &dest);      /* - "" - */
1684         ip->udp_src  = htons(sport);
1685         ip->udp_dst  = htons(dport);
1686         ip->udp_len  = htons(8 + len);
1687         ip->udp_xsum = 0;
1688         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
1689 }
1690
1691 void copy_filename (char *dst, char *src, int size)
1692 {
1693         if (*src && (*src == '"')) {
1694                 ++src;
1695                 --size;
1696         }
1697
1698         while ((--size > 0) && *src && (*src != '"')) {
1699                 *dst++ = *src++;
1700         }
1701         *dst = '\0';
1702 }
1703
1704 #endif
1705
1706 void ip_to_string (IPaddr_t x, char *s)
1707 {
1708         x = ntohl (x);
1709         sprintf (s, "%d.%d.%d.%d",
1710                  (int) ((x >> 24) & 0xff),
1711                  (int) ((x >> 16) & 0xff),
1712                  (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
1713         );
1714 }
1715
1716 IPaddr_t string_to_ip(char *s)
1717 {
1718         IPaddr_t addr;
1719         char *e;
1720         int i;
1721
1722         if (s == NULL)
1723                 return(0);
1724
1725         for (addr=0, i=0; i<4; ++i) {
1726                 ulong val = s ? simple_strtoul(s, &e, 10) : 0;
1727                 addr <<= 8;
1728                 addr |= (val & 0xFF);
1729                 if (s) {
1730                         s = (*e) ? e+1 : e;
1731                 }
1732         }
1733
1734         return (htonl(addr));
1735 }
1736
1737 void VLAN_to_string(ushort x, char *s)
1738 {
1739         x = ntohs(x);
1740
1741         if (x == (ushort)-1)
1742                 x = VLAN_NONE;
1743
1744         if (x == VLAN_NONE)
1745                 strcpy(s, "none");
1746         else
1747                 sprintf(s, "%d", x & VLAN_IDMASK);
1748 }
1749
1750 ushort string_to_VLAN(char *s)
1751 {
1752         ushort id;
1753
1754         if (s == NULL)
1755                 return htons(VLAN_NONE);
1756
1757         if (*s < '0' || *s > '9')
1758                 id = VLAN_NONE;
1759         else
1760                 id = (ushort)simple_strtoul(s, NULL, 10);
1761
1762         return htons(id);
1763 }
1764
1765 void print_IPaddr (IPaddr_t x)
1766 {
1767         char tmp[16];
1768
1769         ip_to_string (x, tmp);
1770
1771         puts (tmp);
1772 }
1773
1774 IPaddr_t getenv_IPaddr (char *var)
1775 {
1776         return (string_to_ip(getenv(var)));
1777 }
1778
1779 ushort getenv_VLAN(char *var)
1780 {
1781         return (string_to_VLAN(getenv(var)));
1782 }