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