git.sur5r.net Git - u-boot/blob - net/net.c

   1 /*
   2  *      Copied from Linux Monitor (LiMon) - Networking.
   3  *
   4  *      Copyright 1994 - 2000 Neil Russell.
   5  *      (See License)
   6  *      Copyright 2000 Roland Borde
   7  *      Copyright 2000 Paolo Scaffardi
   8  *      Copyright 2000-2002 Wolfgang Denk, wd@denx.de
   9  */
  10
  11 /*
  12  * General Desription:
  13  *
  14  * The user interface supports commands for BOOTP, RARP, and TFTP.
  15  * Also, we support ARP internally. Depending on available data,
  16  * these interact as follows:
  17  *
  18  * BOOTP:
  19  *
  20  *      Prerequisites:  - own ethernet address
  21  *      We want:        - own IP address
  22  *                      - TFTP server IP address
  23  *                      - name of bootfile
  24  *      Next step:      ARP
  25  *
  26  * RARP:
  27  *
  28  *      Prerequisites:  - own ethernet address
  29  *      We want:        - own IP address
  30  *                      - TFTP server IP address
  31  *      Next step:      ARP
  32  *
  33  * ARP:
  34  *
  35  *      Prerequisites:  - own ethernet address
  36  *                      - own IP address
  37  *                      - TFTP server IP address
  38  *      We want:        - TFTP server ethernet address
  39  *      Next step:      TFTP
  40  *
  41  * DHCP:
  42  *
  43  *     Prerequisites:   - own ethernet address
  44  *     We want:         - IP, Netmask, ServerIP, Gateway IP
  45  *                      - bootfilename, lease time
  46  *     Next step:       - TFTP
  47  *
  48  * TFTP:
  49  *
  50  *      Prerequisites:  - own ethernet address
  51  *                      - own IP address
  52  *                      - TFTP server IP address
  53  *                      - TFTP server ethernet address
  54  *                      - name of bootfile (if unknown, we use a default name
  55  *                        derived from our own IP address)
  56  *      We want:        - load the boot file
  57  *      Next step:      none
  58  *
  59  * NFS:
  60  *
  61  *      Prerequisites:  - own ethernet address
  62  *                      - own IP address
  63  *                      - name of bootfile (if unknown, we use a default name
  64  *                        derived from our own IP address)
  65  *      We want:        - load the boot file
  66  *      Next step:      none
  67  *
  68  * SNTP:
  69  *
  70  *      Prerequisites:  - own ethernet address
  71  *                      - own IP address
  72  *      We want:        - network time
  73  *      Next step:      none
  74  */
  75
  76
  77 #include <common.h>
  78 #include <watchdog.h>
  79 #include <command.h>
  80 #include <net.h>
  81 #include "bootp.h"
  82 #include "tftp.h"
  83 #include "rarp.h"
  84 #include "nfs.h"
  85 #ifdef CONFIG_STATUS_LED
  86 #include <status_led.h>
  87 #include <miiphy.h>
  88 #endif
  89 #if (CONFIG_COMMANDS & CFG_CMD_SNTP)
  90 #include "sntp.h"
  91 #endif
  92
  93 #if (CONFIG_COMMANDS & CFG_CMD_NET)
  94
  95 #define ARP_TIMEOUT             5               /* Seconds before trying ARP again */
  96 #ifndef CONFIG_NET_RETRY_COUNT
  97 # define ARP_TIMEOUT_COUNT      5               /* # of timeouts before giving up  */
  98 #else
  99 # define ARP_TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT)
 100 #endif
 101
 102 #if 0
 103 #define ET_DEBUG
 104 #endif
 105
 106 /** BOOTP EXTENTIONS **/
 107
 108 IPaddr_t        NetOurSubnetMask=0;             /* Our subnet mask (0=unknown)  */
 109 IPaddr_t        NetOurGatewayIP=0;              /* Our gateways IP address      */
 110 IPaddr_t        NetOurDNSIP=0;                  /* Our DNS IP address           */
 111 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS2)
 112 IPaddr_t        NetOurDNS2IP=0;                 /* Our 2nd DNS IP address       */
 113 #endif
 114 char            NetOurNISDomain[32]={0,};       /* Our NIS domain               */
 115 char            NetOurHostName[32]={0,};        /* Our hostname                 */
 116 char            NetOurRootPath[64]={0,};        /* Our bootpath                 */
 117 ushort          NetBootFileSize=0;              /* Our bootfile size in blocks  */
 118
 119 /** END OF BOOTP EXTENTIONS **/
 120
 121 ulong           NetBootFileXferSize;    /* The actual transferred size of the bootfile (in bytes) */
 122 uchar           NetOurEther[6];         /* Our ethernet address                 */
 123 uchar           NetServerEther[6] =     /* Boot server enet address             */
 124                         { 0, 0, 0, 0, 0, 0 };
 125 IPaddr_t        NetOurIP;               /* Our IP addr (0 = unknown)            */
 126 IPaddr_t        NetServerIP;            /* Our IP addr (0 = unknown)            */
 127 volatile uchar *NetRxPkt;               /* Current receive packet               */
 128 int             NetRxPktLen;            /* Current rx packet length             */
 129 unsigned        NetIPID;                /* IP packet ID                         */
 130 uchar           NetBcastAddr[6] =       /* Ethernet bcast address               */
 131                         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 132 uchar           NetEtherNullAddr[6] =
 133                         { 0, 0, 0, 0, 0, 0 };
 134 #if (CONFIG_COMMANDS & CFG_CMD_CDP)
 135 uchar           NetCDPAddr[6] =         /* Ethernet bcast address               */
 136                         { 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc };
 137 #endif
 138 int             NetState;               /* Network loop state                   */
 139 #ifdef CONFIG_NET_MULTI
 140 int             NetRestartWrap = 0;     /* Tried all network devices            */
 141 static int      NetRestarted = 0;       /* Network loop restarted               */
 142 static int      NetDevExists = 0;       /* At least one device configured       */
 143 #endif
 144
 145 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
 146 ushort          NetOurVLAN = 0xFFFF;            /* default is without VLAN      */
 147 ushort          NetOurNativeVLAN = 0xFFFF;      /* ditto                        */
 148
 149 char            BootFile[128];          /* Boot File name                       */
 150
 151 #if (CONFIG_COMMANDS & CFG_CMD_PING)
 152 IPaddr_t        NetPingIP;              /* the ip address to ping               */
 153
 154 static void PingStart(void);
 155 #endif
 156
 157 #if (CONFIG_COMMANDS & CFG_CMD_CDP)
 158 static void CDPStart(void);
 159 #endif
 160
 161 #if (CONFIG_COMMANDS & CFG_CMD_SNTP)
 162 IPaddr_t        NetNtpServerIP;         /* NTP server IP address                */
 163 int             NetTimeOffset=0;        /* offset time from UTC                 */
 164 #endif
 165
 166 #ifdef CONFIG_NETCONSOLE
 167 void NcStart(void);
 168 int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len);
 169 #endif
 170
 171 volatile uchar  PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 172
 173 volatile uchar *NetRxPackets[PKTBUFSRX]; /* Receive packets                     */
 174
 175 static rxhand_f *packetHandler;         /* Current RX packet handler            */
 176 static thand_f *timeHandler;            /* Current timeout handler              */
 177 static ulong    timeStart;              /* Time base value                      */
 178 static ulong    timeDelta;              /* Current timeout value                */
 179 volatile uchar *NetTxPacket = 0;        /* THE transmit packet                  */
 180
 181 static int net_check_prereq (proto_t protocol);
 182
 183 /**********************************************************************/
 184
 185 IPaddr_t        NetArpWaitPacketIP;
 186 IPaddr_t        NetArpWaitReplyIP;
 187 uchar          *NetArpWaitPacketMAC;    /* MAC address of waiting packet's destination  */
 188 uchar          *NetArpWaitTxPacket;     /* THE transmit packet                  */
 189 int             NetArpWaitTxPacketSize;
 190 uchar           NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
 191 ulong           NetArpWaitTimerStart;
 192 int             NetArpWaitTry;
 193
 194 void ArpRequest (void)
 195 {
 196         int i;
 197         volatile uchar *pkt;
 198         ARP_t *arp;
 199
 200 #ifdef ET_DEBUG
 201         printf ("ARP broadcast %d\n", NetArpWaitTry);
 202 #endif
 203         pkt = NetTxPacket;
 204
 205         pkt += NetSetEther (pkt, NetBcastAddr, PROT_ARP);
 206
 207         arp = (ARP_t *) pkt;
 208
 209         arp->ar_hrd = htons (ARP_ETHER);
 210         arp->ar_pro = htons (PROT_IP);
 211         arp->ar_hln = 6;
 212         arp->ar_pln = 4;
 213         arp->ar_op = htons (ARPOP_REQUEST);
 214
 215         memcpy (&arp->ar_data[0], NetOurEther, 6);              /* source ET addr       */
 216         NetWriteIP ((uchar *) & arp->ar_data[6], NetOurIP);     /* source IP addr       */
 217         for (i = 10; i < 16; ++i) {
 218                 arp->ar_data[i] = 0;                            /* dest ET addr = 0     */
 219         }
 220
 221         if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
 222             (NetOurIP & NetOurSubnetMask)) {
 223                 if (NetOurGatewayIP == 0) {
 224                         puts ("## Warning: gatewayip needed but not set\n");
 225                 }
 226                 NetArpWaitReplyIP = NetOurGatewayIP;
 227         } else {
 228                 NetArpWaitReplyIP = NetArpWaitPacketIP;
 229         }
 230
 231         NetWriteIP ((uchar *) & arp->ar_data[16], NetArpWaitReplyIP);
 232         (void) eth_send (NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
 233 }
 234
 235 void ArpTimeoutCheck(void)
 236 {
 237         ulong t;
 238
 239         if (!NetArpWaitPacketIP)
 240                 return;
 241
 242         t = get_timer(0);
 243
 244         /* check for arp timeout */
 245         if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT * CFG_HZ) {
 246                 NetArpWaitTry++;
 247
 248                 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
 249                         puts ("\nARP Retry count exceeded; starting again\n");
 250                         NetArpWaitTry = 0;
 251                         NetStartAgain();
 252                 } else {
 253                         NetArpWaitTimerStart = t;
 254                         ArpRequest();
 255                 }
 256         }
 257 }
 258
 259 /**********************************************************************/
 260 /*
 261  *      Main network processing loop.
 262  */
 263
 264 int
 265 NetLoop(proto_t protocol)
 266 {
 267         DECLARE_GLOBAL_DATA_PTR;
 268
 269         bd_t *bd = gd->bd;
 270
 271 #ifdef CONFIG_NET_MULTI
 272         NetRestarted = 0;
 273         NetDevExists = 0;
 274 #endif
 275
 276         /* XXX problem with bss workaround */
 277         NetArpWaitPacketMAC = NULL;
 278         NetArpWaitTxPacket = NULL;
 279         NetArpWaitPacketIP = 0;
 280         NetArpWaitReplyIP = 0;
 281         NetArpWaitTxPacket = NULL;
 282         NetTxPacket = NULL;
 283
 284         if (!NetTxPacket) {
 285                 int     i;
 286                 /*
 287                  *      Setup packet buffers, aligned correctly.
 288                  */
 289                 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
 290                 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
 291                 for (i = 0; i < PKTBUFSRX; i++) {
 292                         NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
 293                 }
 294         }
 295
 296         if (!NetArpWaitTxPacket) {
 297                 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
 298                 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
 299                 NetArpWaitTxPacketSize = 0;
 300         }
 301
 302         eth_halt();
 303 #ifdef CONFIG_NET_MULTI
 304         eth_set_current();
 305 #endif
 306         if (eth_init(bd) < 0)
 307                 return(-1);
 308
 309 restart:
 310 #ifdef CONFIG_NET_MULTI
 311         memcpy (NetOurEther, eth_get_dev()->enetaddr, 6);
 312 #else
 313         memcpy (NetOurEther, bd->bi_enetaddr, 6);
 314 #endif
 315
 316         NetState = NETLOOP_CONTINUE;
 317
 318         /*
 319          *      Start the ball rolling with the given start function.  From
 320          *      here on, this code is a state machine driven by received
 321          *      packets and timer events.
 322          */
 323
 324         switch (protocol) {
 325 #if (CONFIG_COMMANDS & CFG_CMD_NFS)
 326         case NFS:
 327 #endif
 328 #if (CONFIG_COMMANDS & CFG_CMD_PING)
 329         case PING:
 330 #endif
 331 #if (CONFIG_COMMANDS & CFG_CMD_SNTP)
 332         case SNTP:
 333 #endif
 334         case NETCONS:
 335         case TFTP:
 336                 NetCopyIP(&NetOurIP, &bd->bi_ip_addr);
 337                 NetOurGatewayIP = getenv_IPaddr ("gatewayip");
 338                 NetOurSubnetMask= getenv_IPaddr ("netmask");
 339                 NetOurVLAN = getenv_VLAN("vlan");
 340                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 341
 342                 switch (protocol) {
 343 #if (CONFIG_COMMANDS & CFG_CMD_NFS)
 344                 case NFS:
 345 #endif
 346                 case NETCONS:
 347                 case TFTP:
 348                         NetServerIP = getenv_IPaddr ("serverip");
 349                         break;
 350 #if (CONFIG_COMMANDS & CFG_CMD_PING)
 351                 case PING:
 352                         /* nothing */
 353                         break;
 354 #endif
 355 #if (CONFIG_COMMANDS & CFG_CMD_SNTP)
 356                 case SNTP:
 357                         /* nothing */
 358                         break;
 359 #endif
 360                 default:
 361                         break;
 362                 }
 363
 364                 break;
 365         case BOOTP:
 366         case RARP:
 367                 /*
 368                  * initialize our IP addr to 0 in order to accept ANY
 369                  * IP addr assigned to us by the BOOTP / RARP server
 370                  */
 371                 NetOurIP = 0;
 372                 NetServerIP = getenv_IPaddr ("serverip");
 373                 NetOurVLAN = getenv_VLAN("vlan");       /* VLANs must be read */
 374                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 375         case CDP:
 376                 NetOurVLAN = getenv_VLAN("vlan");       /* VLANs must be read */
 377                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 378                 break;
 379         default:
 380                 break;
 381         }
 382
 383         switch (net_check_prereq (protocol)) {
 384         case 1:
 385                 /* network not configured */
 386                 return (-1);
 387
 388 #ifdef CONFIG_NET_MULTI
 389         case 2:
 390                 /* network device not configured */
 391                 break;
 392 #endif /* CONFIG_NET_MULTI */
 393
 394         case 0:
 395 #ifdef CONFIG_NET_MULTI
 396                 NetDevExists = 1;
 397 #endif
 398                 switch (protocol) {
 399                 case TFTP:
 400                         /* always use ARP to get server ethernet address */
 401                         TftpStart();
 402                         break;
 403
 404 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
 405                 case DHCP:
 406                         /* Start with a clean slate... */
 407                         BootpTry = 0;
 408                         NetOurIP = 0;
 409                         NetServerIP = getenv_IPaddr ("serverip");
 410                         DhcpRequest();          /* Basically same as BOOTP */
 411                         break;
 412 #endif /* CFG_CMD_DHCP */
 413
 414                 case BOOTP:
 415                         BootpTry = 0;
 416                         BootpRequest ();
 417                         break;
 418
 419                 case RARP:
 420                         RarpTry = 0;
 421                         RarpRequest ();
 422                         break;
 423 #if (CONFIG_COMMANDS & CFG_CMD_PING)
 424                 case PING:
 425                         PingStart();
 426                         break;
 427 #endif
 428 #if (CONFIG_COMMANDS & CFG_CMD_NFS)
 429                 case NFS:
 430                         NfsStart();
 431                         break;
 432 #endif
 433 #if (CONFIG_COMMANDS & CFG_CMD_CDP)
 434                 case CDP:
 435                         CDPStart();
 436                         break;
 437 #endif
 438 #ifdef CONFIG_NETCONSOLE
 439                 case NETCONS:
 440                         NcStart();
 441                         break;
 442 #endif
 443 #if (CONFIG_COMMANDS & CFG_CMD_SNTP)
 444                 case SNTP:
 445                         SntpStart();
 446                         break;
 447 #endif
 448                 default:
 449                         break;
 450                 }
 451
 452                 NetBootFileXferSize = 0;
 453                 break;
 454         }
 455
 456 #if defined(CONFIG_MII) || (CONFIG_COMMANDS & CFG_CMD_MII)
 457 #if defined(CFG_FAULT_ECHO_LINK_DOWN) && defined(CONFIG_STATUS_LED) && defined(STATUS_LED_RED)
 458         /*
 459          * Echo the inverted link state to the fault LED.
 460          */
 461         if(miiphy_link(CFG_FAULT_MII_ADDR)) {
 462                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 463         } else {
 464                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 465         }
 466 #endif /* CFG_FAULT_ECHO_LINK_DOWN, ... */
 467 #endif /* CONFIG_MII, ... */
 468
 469         /*
 470          *      Main packet reception loop.  Loop receiving packets until
 471          *      someone sets `NetQuit'.
 472          */
 473         for (;;) {
 474                 WATCHDOG_RESET();
 475 #ifdef CONFIG_SHOW_ACTIVITY
 476                 {
 477                         extern void show_activity(int arg);
 478                         show_activity(1);
 479                 }
 480 #endif
 481                 /*
 482                  *      Check the ethernet for a new packet.  The ethernet
 483                  *      receive routine will process it.
 484                  */
 485                         eth_rx();
 486
 487                 /*
 488                  *      Abort if ctrl-c was pressed.
 489                  */
 490                 if (ctrlc()) {
 491                         eth_halt();
 492                         puts ("\nAbort\n");
 493                         return (-1);
 494                 }
 495
 496                 ArpTimeoutCheck();
 497
 498                 /*
 499                  *      Check for a timeout, and run the timeout handler
 500                  *      if we have one.
 501                  */
 502                 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
 503                         thand_f *x;
 504
 505 #if defined(CONFIG_MII) || (CONFIG_COMMANDS & CFG_CMD_MII)
 506 #if defined(CFG_FAULT_ECHO_LINK_DOWN) && defined(CONFIG_STATUS_LED) && defined(STATUS_LED_RED)
 507                         /*
 508                          * Echo the inverted link state to the fault LED.
 509                          */
 510                         if(miiphy_link(CFG_FAULT_MII_ADDR)) {
 511                                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 512                         } else {
 513                                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 514                         }
 515 #endif /* CFG_FAULT_ECHO_LINK_DOWN, ... */
 516 #endif /* CONFIG_MII, ... */
 517                         x = timeHandler;
 518                         timeHandler = (thand_f *)0;
 519                         (*x)();
 520                 }
 521
 522
 523                 switch (NetState) {
 524
 525                 case NETLOOP_RESTART:
 526 #ifdef CONFIG_NET_MULTI
 527                         NetRestarted = 1;
 528 #endif
 529                         goto restart;
 530
 531                 case NETLOOP_SUCCESS:
 532                         if (NetBootFileXferSize > 0) {
 533                                 char buf[10];
 534                                 printf("Bytes transferred = %ld (%lx hex)\n",
 535                                         NetBootFileXferSize,
 536                                         NetBootFileXferSize);
 537                                 sprintf(buf, "%lx", NetBootFileXferSize);
 538                                 setenv("filesize", buf);
 539
 540                                 sprintf(buf, "%lX", (unsigned long)load_addr);
 541                                 setenv("fileaddr", buf);
 542                         }
 543                         eth_halt();
 544                         return NetBootFileXferSize;
 545
 546                 case NETLOOP_FAIL:
 547                         return (-1);
 548                 }
 549         }
 550 }
 551
 552 /**********************************************************************/
 553
 554 static void
 555 startAgainTimeout(void)
 556 {
 557         NetState = NETLOOP_RESTART;
 558 }
 559
 560 static void
 561 startAgainHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
 562 {
 563         /* Totally ignore the packet */
 564 }
 565
 566 void NetStartAgain (void)
 567 {
 568 #ifdef  CONFIG_NET_MULTI
 569         DECLARE_GLOBAL_DATA_PTR;
 570 #endif
 571         char *nretry;
 572         int noretry = 0, once = 0;
 573
 574         if ((nretry = getenv ("netretry")) != NULL) {
 575                 noretry = (strcmp (nretry, "no") == 0);
 576                 once = (strcmp (nretry, "once") == 0);
 577         }
 578         if (noretry) {
 579                 eth_halt ();
 580                 NetState = NETLOOP_FAIL;
 581                 return;
 582         }
 583 #ifndef CONFIG_NET_MULTI
 584         NetSetTimeout (10 * CFG_HZ, startAgainTimeout);
 585         NetSetHandler (startAgainHandler);
 586 #else   /* !CONFIG_NET_MULTI*/
 587         eth_halt ();
 588         eth_try_another (!NetRestarted);
 589         eth_init (gd->bd);
 590         if (NetRestartWrap) {
 591                 NetRestartWrap = 0;
 592                 if (NetDevExists && !once) {
 593                         NetSetTimeout (10 * CFG_HZ, startAgainTimeout);
 594                         NetSetHandler (startAgainHandler);
 595                 } else {
 596                         NetState = NETLOOP_FAIL;
 597                 }
 598         } else {
 599                 NetState = NETLOOP_RESTART;
 600         }
 601 #endif  /* CONFIG_NET_MULTI */
 602 }
 603
 604 /**********************************************************************/
 605 /*
 606  *      Miscelaneous bits.
 607  */
 608
 609 void
 610 NetSetHandler(rxhand_f * f)
 611 {
 612         packetHandler = f;
 613 }
 614
 615
 616 void
 617 NetSetTimeout(ulong iv, thand_f * f)
 618 {
 619         if (iv == 0) {
 620                 timeHandler = (thand_f *)0;
 621         } else {
 622                 timeHandler = f;
 623                 timeStart = get_timer(0);
 624                 timeDelta = iv;
 625         }
 626 }
 627
 628
 629 void
 630 NetSendPacket(volatile uchar * pkt, int len)
 631 {
 632         (void) eth_send(pkt, len);
 633 }
 634
 635 int
 636 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
 637 {
 638         uchar *pkt;
 639
 640         /* convert to new style broadcast */
 641         if (dest == 0)
 642                 dest = 0xFFFFFFFF;
 643
 644         /* if broadcast, make the ether address a broadcast and don't do ARP */
 645         if (dest == 0xFFFFFFFF)
 646                 ether = NetBcastAddr;
 647
 648         /* if MAC address was not discovered yet, save the packet and do an ARP request */
 649         if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
 650
 651 #ifdef ET_DEBUG
 652                 printf("sending ARP for %08lx\n", dest);
 653 #endif
 654                 NetArpWaitPacketIP = dest;
 655                 NetArpWaitPacketMAC = ether;
 656
 657                 pkt = NetArpWaitTxPacket;
 658                 pkt += NetSetEther (pkt, NetArpWaitPacketMAC, PROT_IP);
 659
 660                 NetSetIP (pkt, dest, dport, sport, len);
 661                 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len);
 662
 663                 /* size of the waiting packet */
 664                 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE + len;
 665
 666                 /* and do the ARP request */
 667                 NetArpWaitTry = 1;
 668                 NetArpWaitTimerStart = get_timer(0);
 669                 ArpRequest();
 670                 return 1;       /* waiting */
 671         }
 672
 673 #ifdef ET_DEBUG
 674         printf("sending UDP to %08lx/%02x:%02x:%02x:%02x:%02x:%02x\n",
 675                 dest, ether[0], ether[1], ether[2], ether[3], ether[4], ether[5]);
 676 #endif
 677
 678         pkt = (uchar *)NetTxPacket;
 679         pkt += NetSetEther (pkt, ether, PROT_IP);
 680         NetSetIP (pkt, dest, dport, sport, len);
 681         (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len);
 682
 683         return 0;       /* transmitted */
 684 }
 685
 686 #if (CONFIG_COMMANDS & CFG_CMD_PING)
 687 static ushort PingSeqNo;
 688
 689 int PingSend(void)
 690 {
 691         static uchar mac[6];
 692         volatile IP_t *ip;
 693         volatile ushort *s;
 694         uchar *pkt;
 695
 696         /* XXX always send arp request */
 697
 698         memcpy(mac, NetEtherNullAddr, 6);
 699
 700 #ifdef ET_DEBUG
 701         printf("sending ARP for %08lx\n", NetPingIP);
 702 #endif
 703
 704         NetArpWaitPacketIP = NetPingIP;
 705         NetArpWaitPacketMAC = mac;
 706
 707         pkt = NetArpWaitTxPacket;
 708         pkt += NetSetEther(pkt, mac, PROT_IP);
 709
 710         ip = (volatile IP_t *)pkt;
 711
 712         /*
 713          *      Construct an IP and ICMP header.  (need to set no fragment bit - XXX)
 714          */
 715         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
 716         ip->ip_tos   = 0;
 717         ip->ip_len   = htons(IP_HDR_SIZE_NO_UDP + 8);
 718         ip->ip_id    = htons(NetIPID++);
 719         ip->ip_off   = htons(0x4000);   /* No fragmentation */
 720         ip->ip_ttl   = 255;
 721         ip->ip_p     = 0x01;            /* ICMP */
 722         ip->ip_sum   = 0;
 723         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
 724         NetCopyIP((void*)&ip->ip_dst, &NetPingIP);         /* - "" - */
 725         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
 726
 727         s = &ip->udp_src;               /* XXX ICMP starts here */
 728         s[0] = htons(0x0800);           /* echo-request, code */
 729         s[1] = 0;                       /* checksum */
 730         s[2] = 0;                       /* identifier */
 731         s[3] = htons(PingSeqNo++);      /* sequence number */
 732         s[1] = ~NetCksum((uchar *)s, 8/2);
 733
 734         /* size of the waiting packet */
 735         NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8;
 736
 737         /* and do the ARP request */
 738         NetArpWaitTry = 1;
 739         NetArpWaitTimerStart = get_timer(0);
 740         ArpRequest();
 741         return 1;       /* waiting */
 742 }
 743
 744 static void
 745 PingTimeout (void)
 746 {
 747         eth_halt();
 748         NetState = NETLOOP_FAIL;        /* we did not get the reply */
 749 }
 750
 751 static void
 752 PingHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
 753 {
 754         IPaddr_t tmp;
 755         volatile IP_t *ip = (volatile IP_t *)pkt;
 756
 757         tmp = NetReadIP((void *)&ip->ip_src);
 758         if (tmp != NetPingIP)
 759                 return;
 760
 761         NetState = NETLOOP_SUCCESS;
 762 }
 763
 764 static void PingStart(void)
 765 {
 766 #if defined(CONFIG_NET_MULTI)
 767         printf ("Using %s device\n", eth_get_name());
 768 #endif  /* CONFIG_NET_MULTI */
 769         NetSetTimeout (10 * CFG_HZ, PingTimeout);
 770         NetSetHandler (PingHandler);
 771
 772         PingSend();
 773 }
 774 #endif  /* CFG_CMD_PING */
 775
 776 #if (CONFIG_COMMANDS & CFG_CMD_CDP)
 777
 778 #define CDP_DEVICE_ID_TLV               0x0001
 779 #define CDP_ADDRESS_TLV                 0x0002
 780 #define CDP_PORT_ID_TLV                 0x0003
 781 #define CDP_CAPABILITIES_TLV            0x0004
 782 #define CDP_VERSION_TLV                 0x0005
 783 #define CDP_PLATFORM_TLV                0x0006
 784 #define CDP_NATIVE_VLAN_TLV             0x000a
 785 #define CDP_APPLIANCE_VLAN_TLV          0x000e
 786 #define CDP_TRIGGER_TLV                 0x000f
 787 #define CDP_POWER_CONSUMPTION_TLV       0x0010
 788 #define CDP_SYSNAME_TLV                 0x0014
 789 #define CDP_SYSOBJECT_TLV               0x0015
 790 #define CDP_MANAGEMENT_ADDRESS_TLV      0x0016
 791
 792 #define CDP_TIMEOUT                     (CFG_HZ/4)      /* one packet every 250ms */
 793
 794 static int CDPSeq;
 795 static int CDPOK;
 796
 797 ushort CDPNativeVLAN;
 798 ushort CDPApplianceVLAN;
 799
 800 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 0x00 };
 801
 802 static ushort CDP_compute_csum(const uchar *buff, ushort len)
 803 {
 804         ushort csum;
 805         int     odd;
 806         ulong   result = 0;
 807         ushort  leftover;
 808
 809         if (len > 0) {
 810                 odd = 1 & (ulong)buff;
 811                 if (odd) {
 812                         result = *buff << 8;
 813                         len--;
 814                         buff++;
 815                 }
 816                 while (len > 1) {
 817                         result += *((const ushort *)buff)++;
 818                         if (result & 0x80000000)
 819                                 result = (result & 0xFFFF) + (result >> 16);
 820                         len -= 2;
 821                 }
 822                 if (len) {
 823                         leftover = (signed short)(*(const signed char *)buff);
 824                         /* * XXX CISCO SUCKS big time! (and blows too) */
 825                         result = (result & 0xffff0000) | ((result + leftover) & 0x0000ffff);
 826                 }
 827                 while (result >> 16)
 828                         result = (result & 0xFFFF) + (result >> 16);
 829
 830                 if (odd)
 831                         result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
 832         }
 833
 834         /* add up 16-bit and 17-bit words for 17+c bits */
 835         result = (result & 0xffff) + (result >> 16);
 836         /* add up 16-bit and 2-bit for 16+c bit */
 837         result = (result & 0xffff) + (result >> 16);
 838         /* add up carry.. */
 839         result = (result & 0xffff) + (result >> 16);
 840
 841         /* negate */
 842         csum = ~(ushort)result;
 843
 844         /* run time endian detection */
 845         if (csum != htons(csum))        /* little endian */
 846                 csum = htons(csum);
 847
 848         return csum;
 849 }
 850
 851 int CDPSendTrigger(void)
 852 {
 853         volatile uchar *pkt;
 854         volatile ushort *s;
 855         volatile ushort *cp;
 856         Ethernet_t *et;
 857         int len;
 858         ushort chksum;
 859 #if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID)   || \
 860     defined(CONFIG_CDP_VERSION)   || defined(CONFIG_CDP_PLATFORM)
 861         char buf[32];
 862 #endif
 863
 864         pkt = NetTxPacket;
 865         et = (Ethernet_t *)pkt;
 866
 867         /* NOTE: trigger sent not on any VLAN */
 868
 869         /* form ethernet header */
 870         memcpy(et->et_dest, NetCDPAddr, 6);
 871         memcpy(et->et_src, NetOurEther, 6);
 872
 873         pkt += ETHER_HDR_SIZE;
 874
 875         /* SNAP header */
 876         memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr));
 877         pkt += sizeof(CDP_SNAP_hdr);
 878
 879         /* CDP header */
 880         *pkt++ = 0x02;                          /* CDP version 2 */
 881         *pkt++ = 180;                           /* TTL */
 882         s = (volatile ushort *)pkt;
 883         cp = s;
 884         *s++ = htons(0);                        /* checksum (0 for later calculation) */
 885
 886         /* CDP fields */
 887 #ifdef CONFIG_CDP_DEVICE_ID
 888         *s++ = htons(CDP_DEVICE_ID_TLV);
 889         *s++ = htons(CONFIG_CDP_DEVICE_ID);
 890         memset(buf, 0, sizeof(buf));
 891         sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%02X%02X%02X%02X%02X%02X",
 892                 NetOurEther[0] & 0xff, NetOurEther[1] & 0xff,
 893                 NetOurEther[2] & 0xff, NetOurEther[3] & 0xff,
 894                 NetOurEther[4] & 0xff, NetOurEther[5] & 0xff);
 895         memcpy((uchar *)s, buf, 16);
 896         s += 16 / 2;
 897 #endif
 898
 899 #ifdef CONFIG_CDP_PORT_ID
 900         *s++ = htons(CDP_PORT_ID_TLV);
 901         memset(buf, 0, sizeof(buf));
 902         sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index());
 903         len = strlen(buf);
 904         if (len & 1)    /* make it even */
 905                 len++;
 906         *s++ = htons(len + 4);
 907         memcpy((uchar *)s, buf, len);
 908         s += len / 2;
 909 #endif
 910
 911 #ifdef CONFIG_CDP_CAPABILITIES
 912         *s++ = htons(CDP_CAPABILITIES_TLV);
 913         *s++ = htons(8);
 914         *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES);
 915         s += 2;
 916 #endif
 917
 918 #ifdef CONFIG_CDP_VERSION
 919         *s++ = htons(CDP_VERSION_TLV);
 920         memset(buf, 0, sizeof(buf));
 921         strcpy(buf, CONFIG_CDP_VERSION);
 922         len = strlen(buf);
 923         if (len & 1)    /* make it even */
 924                 len++;
 925         *s++ = htons(len + 4);
 926         memcpy((uchar *)s, buf, len);
 927         s += len / 2;
 928 #endif
 929
 930 #ifdef CONFIG_CDP_PLATFORM
 931         *s++ = htons(CDP_PLATFORM_TLV);
 932         memset(buf, 0, sizeof(buf));
 933         strcpy(buf, CONFIG_CDP_PLATFORM);
 934         len = strlen(buf);
 935         if (len & 1)    /* make it even */
 936                 len++;
 937         *s++ = htons(len + 4);
 938         memcpy((uchar *)s, buf, len);
 939         s += len / 2;
 940 #endif
 941
 942 #ifdef CONFIG_CDP_TRIGGER
 943         *s++ = htons(CDP_TRIGGER_TLV);
 944         *s++ = htons(8);
 945         *(ulong *)s = htonl(CONFIG_CDP_TRIGGER);
 946         s += 2;
 947 #endif
 948
 949 #ifdef CONFIG_CDP_POWER_CONSUMPTION
 950         *s++ = htons(CDP_POWER_CONSUMPTION_TLV);
 951         *s++ = htons(6);
 952         *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION);
 953 #endif
 954
 955         /* length of ethernet packet */
 956         len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE);
 957         et->et_protlen = htons(len);
 958
 959         len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr);
 960         chksum = CDP_compute_csum((uchar *)NetTxPacket + len, (uchar *)s - (NetTxPacket + len));
 961         if (chksum == 0)
 962                 chksum = 0xFFFF;
 963         *cp = htons(chksum);
 964
 965         (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket);
 966         return 0;
 967 }
 968
 969 static void
 970 CDPTimeout (void)
 971 {
 972         CDPSeq++;
 973
 974         if (CDPSeq < 3) {
 975                 NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
 976                 CDPSendTrigger();
 977                 return;
 978         }
 979
 980         /* if not OK try again */
 981         if (!CDPOK)
 982                 NetStartAgain();
 983         else
 984                 NetState = NETLOOP_SUCCESS;
 985 }
 986
 987 static void
 988 CDPDummyHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
 989 {
 990         /* nothing */
 991 }
 992
 993 static void
 994 CDPHandler(const uchar * pkt, unsigned len)
 995 {
 996         const uchar *t;
 997         const ushort *ss;
 998         ushort type, tlen;
 999         uchar applid;
1000         ushort vlan, nvlan;
1001
1002         /* minimum size? */
1003         if (len < sizeof(CDP_SNAP_hdr) + 4)
1004                 goto pkt_short;
1005
1006         /* check for valid CDP SNAP header */
1007         if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0)
1008                 return;
1009
1010         pkt += sizeof(CDP_SNAP_hdr);
1011         len -= sizeof(CDP_SNAP_hdr);
1012
1013         /* Version of CDP protocol must be >= 2 and TTL != 0 */
1014         if (pkt[0] < 0x02 || pkt[1] == 0)
1015                 return;
1016
1017         /* if version is greater than 0x02 maybe we'll have a problem; output a warning */
1018         if (pkt[0] != 0x02)
1019                 printf("** WARNING: CDP packet received with a protocol version %d > 2\n",
1020                                 pkt[0] & 0xff);
1021
1022         if (CDP_compute_csum(pkt, len) != 0)
1023                 return;
1024
1025         pkt += 4;
1026         len -= 4;
1027
1028         vlan = htons(-1);
1029         nvlan = htons(-1);
1030         while (len > 0) {
1031                 if (len < 4)
1032                         goto pkt_short;
1033
1034                 ss = (const ushort *)pkt;
1035                 type = ntohs(ss[0]);
1036                 tlen = ntohs(ss[1]);
1037                 if (tlen > len) {
1038                         goto pkt_short;
1039                 }
1040
1041                 pkt += tlen;
1042                 len -= tlen;
1043
1044                 ss += 2;        /* point ss to the data of the TLV */
1045                 tlen -= 4;
1046
1047                 switch (type) {
1048                         case CDP_DEVICE_ID_TLV:
1049                                 break;
1050                         case CDP_ADDRESS_TLV:
1051                                 break;
1052                         case CDP_PORT_ID_TLV:
1053                                 break;
1054                         case CDP_CAPABILITIES_TLV:
1055                                 break;
1056                         case CDP_VERSION_TLV:
1057                                 break;
1058                         case CDP_PLATFORM_TLV:
1059                                 break;
1060                         case CDP_NATIVE_VLAN_TLV:
1061                                 nvlan = *ss;
1062                                 break;
1063                         case CDP_APPLIANCE_VLAN_TLV:
1064                                 t = (const uchar *)ss;
1065                                 while (tlen > 0) {
1066                                         if (tlen < 3)
1067                                                 goto pkt_short;
1068
1069                                         applid = t[0];
1070                                         ss = (const ushort *)(t + 1);
1071
1072 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE
1073                                         if (applid == CONFIG_CDP_APPLIANCE_VLAN_TYPE)
1074                                                 vlan = *ss;
1075 #else
1076                                         vlan = ntohs(*ss);      /* XXX will this work; dunno */
1077 #endif
1078                                         t += 3; tlen -= 3;
1079                                 }
1080                                 break;
1081                         case CDP_TRIGGER_TLV:
1082                                 break;
1083                         case CDP_POWER_CONSUMPTION_TLV:
1084                                 break;
1085                         case CDP_SYSNAME_TLV:
1086                                 break;
1087                         case CDP_SYSOBJECT_TLV:
1088                                 break;
1089                         case CDP_MANAGEMENT_ADDRESS_TLV:
1090                                 break;
1091                 }
1092         }
1093
1094         CDPApplianceVLAN = vlan;
1095         CDPNativeVLAN = nvlan;
1096
1097         CDPOK = 1;
1098         return;
1099
1100  pkt_short:
1101         printf("** CDP packet is too short\n");
1102         return;
1103 }
1104
1105 static void CDPStart(void)
1106 {
1107 #if defined(CONFIG_NET_MULTI)
1108         printf ("Using %s device\n", eth_get_name());
1109 #endif
1110         CDPSeq = 0;
1111         CDPOK = 0;
1112
1113         CDPNativeVLAN = htons(-1);
1114         CDPApplianceVLAN = htons(-1);
1115
1116         NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
1117         NetSetHandler (CDPDummyHandler);
1118
1119         CDPSendTrigger();
1120 }
1121 #endif  /* CFG_CMD_CDP */
1122
1123
1124 void
1125 NetReceive(volatile uchar * inpkt, int len)
1126 {
1127         Ethernet_t *et;
1128         IP_t    *ip;
1129         ARP_t   *arp;
1130         IPaddr_t tmp;
1131         int     x;
1132         uchar *pkt;
1133 #if (CONFIG_COMMANDS & CFG_CMD_CDP)
1134         int iscdp;
1135 #endif
1136         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1137
1138 #ifdef ET_DEBUG
1139         printf("packet received\n");
1140 #endif
1141
1142         NetRxPkt = inpkt;
1143         NetRxPktLen = len;
1144         et = (Ethernet_t *)inpkt;
1145
1146         /* too small packet? */
1147         if (len < ETHER_HDR_SIZE)
1148                 return;
1149
1150 #if (CONFIG_COMMANDS & CFG_CMD_CDP)
1151         /* keep track if packet is CDP */
1152         iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0;
1153 #endif
1154
1155         myvlanid = ntohs(NetOurVLAN);
1156         if (myvlanid == (ushort)-1)
1157                 myvlanid = VLAN_NONE;
1158         mynvlanid = ntohs(NetOurNativeVLAN);
1159         if (mynvlanid == (ushort)-1)
1160                 mynvlanid = VLAN_NONE;
1161
1162         x = ntohs(et->et_protlen);
1163
1164 #ifdef ET_DEBUG
1165         printf("packet received\n");
1166 #endif
1167
1168         if (x < 1514) {
1169                 /*
1170                  *      Got a 802 packet.  Check the other protocol field.
1171                  */
1172                 x = ntohs(et->et_prot);
1173
1174                 ip = (IP_t *)(inpkt + E802_HDR_SIZE);
1175                 len -= E802_HDR_SIZE;
1176
1177         } else if (x != PROT_VLAN) {    /* normal packet */
1178                 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE);
1179                 len -= ETHER_HDR_SIZE;
1180
1181         } else {                        /* VLAN packet */
1182                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et;
1183
1184 #ifdef ET_DEBUG
1185                 printf("VLAN packet received\n");
1186 #endif
1187                 /* too small packet? */
1188                 if (len < VLAN_ETHER_HDR_SIZE)
1189                         return;
1190
1191                 /* if no VLAN active */
1192                 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
1193 #if (CONFIG_COMMANDS & CFG_CMD_CDP)
1194                                 && iscdp == 0
1195 #endif
1196                                 )
1197                         return;
1198
1199                 cti = ntohs(vet->vet_tag);
1200                 vlanid = cti & VLAN_IDMASK;
1201                 x = ntohs(vet->vet_type);
1202
1203                 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE);
1204                 len -= VLAN_ETHER_HDR_SIZE;
1205         }
1206
1207 #ifdef ET_DEBUG
1208         printf("Receive from protocol 0x%x\n", x);
1209 #endif
1210
1211 #if (CONFIG_COMMANDS & CFG_CMD_CDP)
1212         if (iscdp) {
1213                 CDPHandler((uchar *)ip, len);
1214                 return;
1215         }
1216 #endif
1217
1218         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1219                 if (vlanid == VLAN_NONE)
1220                         vlanid = (mynvlanid & VLAN_IDMASK);
1221                 /* not matched? */
1222                 if (vlanid != (myvlanid & VLAN_IDMASK))
1223                         return;
1224         }
1225
1226         switch (x) {
1227
1228         case PROT_ARP:
1229                 /*
1230                  * We have to deal with two types of ARP packets:
1231                  * - REQUEST packets will be answered by sending  our
1232                  *   IP address - if we know it.
1233                  * - REPLY packates are expected only after we asked
1234                  *   for the TFTP server's or the gateway's ethernet
1235                  *   address; so if we receive such a packet, we set
1236                  *   the server ethernet address
1237                  */
1238 #ifdef ET_DEBUG
1239                 puts ("Got ARP\n");
1240 #endif
1241                 arp = (ARP_t *)ip;
1242                 if (len < ARP_HDR_SIZE) {
1243                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1244                         return;
1245                 }
1246                 if (ntohs(arp->ar_hrd) != ARP_ETHER) {
1247                         return;
1248                 }
1249                 if (ntohs(arp->ar_pro) != PROT_IP) {
1250                         return;
1251                 }
1252                 if (arp->ar_hln != 6) {
1253                         return;
1254                 }
1255                 if (arp->ar_pln != 4) {
1256                         return;
1257                 }
1258
1259                 if (NetOurIP == 0) {
1260                         return;
1261                 }
1262
1263                 if (NetReadIP(&arp->ar_data[16]) != NetOurIP) {
1264                         return;
1265                 }
1266
1267                 switch (ntohs(arp->ar_op)) {
1268                 case ARPOP_REQUEST:             /* reply with our IP address    */
1269 #ifdef ET_DEBUG
1270                         puts ("Got ARP REQUEST, return our IP\n");
1271 #endif
1272                         pkt = (uchar *)et;
1273                         pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
1274                         arp->ar_op = htons(ARPOP_REPLY);
1275                         memcpy   (&arp->ar_data[10], &arp->ar_data[0], 6);
1276                         NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
1277                         memcpy   (&arp->ar_data[ 0], NetOurEther, 6);
1278                         NetCopyIP(&arp->ar_data[ 6], &NetOurIP);
1279                         (void) eth_send((uchar *)et, (pkt - (uchar *)et) + ARP_HDR_SIZE);
1280                         return;
1281
1282                 case ARPOP_REPLY:               /* arp reply */
1283                         /* are we waiting for a reply */
1284                         if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
1285                                 break;
1286 #ifdef ET_DEBUG
1287                         printf("Got ARP REPLY, set server/gtwy eth addr (%02x:%02x:%02x:%02x:%02x:%02x)\n",
1288                                 arp->ar_data[0], arp->ar_data[1],
1289                                 arp->ar_data[2], arp->ar_data[3],
1290                                 arp->ar_data[4], arp->ar_data[5]);
1291 #endif
1292
1293                         tmp = NetReadIP(&arp->ar_data[6]);
1294
1295                         /* matched waiting packet's address */
1296                         if (tmp == NetArpWaitReplyIP) {
1297 #ifdef ET_DEBUG
1298                                 puts ("Got it\n");
1299 #endif
1300                                 /* save address for later use */
1301                                 memcpy(NetArpWaitPacketMAC, &arp->ar_data[0], 6);
1302
1303 #ifdef CONFIG_NETCONSOLE
1304                                 (*packetHandler)(0,0,0,0);
1305 #endif
1306                                 /* modify header, and transmit it */
1307                                 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6);
1308                                 (void) eth_send(NetArpWaitTxPacket, NetArpWaitTxPacketSize);
1309
1310                                 /* no arp request pending now */
1311                                 NetArpWaitPacketIP = 0;
1312                                 NetArpWaitTxPacketSize = 0;
1313                                 NetArpWaitPacketMAC = NULL;
1314
1315                         }
1316                         return;
1317                 default:
1318 #ifdef ET_DEBUG
1319                         printf("Unexpected ARP opcode 0x%x\n", ntohs(arp->ar_op));
1320 #endif
1321                         return;
1322                 }
1323                 break;
1324
1325         case PROT_RARP:
1326 #ifdef ET_DEBUG
1327                 puts ("Got RARP\n");
1328 #endif
1329                 arp = (ARP_t *)ip;
1330                 if (len < ARP_HDR_SIZE) {
1331                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1332                         return;
1333                 }
1334
1335                 if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
1336                         (ntohs(arp->ar_hrd) != ARP_ETHER)   ||
1337                         (ntohs(arp->ar_pro) != PROT_IP)     ||
1338                         (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
1339
1340                         puts ("invalid RARP header\n");
1341                 } else {
1342                         NetCopyIP(&NetOurIP,    &arp->ar_data[16]);
1343                         if (NetServerIP == 0)
1344                                 NetCopyIP(&NetServerIP, &arp->ar_data[ 6]);
1345                         memcpy (NetServerEther, &arp->ar_data[ 0], 6);
1346
1347                         (*packetHandler)(0,0,0,0);
1348                 }
1349                 break;
1350
1351         case PROT_IP:
1352 #ifdef ET_DEBUG
1353                 puts ("Got IP\n");
1354 #endif
1355                 if (len < IP_HDR_SIZE) {
1356                         debug ("len bad %d < %d\n", len, IP_HDR_SIZE);
1357                         return;
1358                 }
1359                 if (len < ntohs(ip->ip_len)) {
1360                         printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
1361                         return;
1362                 }
1363                 len = ntohs(ip->ip_len);
1364 #ifdef ET_DEBUG
1365                 printf("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
1366 #endif
1367                 if ((ip->ip_hl_v & 0xf0) != 0x40) {
1368                         return;
1369                 }
1370                 if (ip->ip_off & htons(0x1fff)) { /* Can't deal w/ fragments */
1371                         return;
1372                 }
1373                 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
1374                         puts ("checksum bad\n");
1375                         return;
1376                 }
1377                 tmp = NetReadIP(&ip->ip_dst);
1378                 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
1379                         return;
1380                 }
1381                 /*
1382                  * watch for ICMP host redirects
1383                  *
1384                  * There is no real handler code (yet). We just watch
1385                  * for ICMP host redirect messages. In case anybody
1386                  * sees these messages: please contact me
1387                  * (wd@denx.de), or - even better - send me the
1388                  * necessary fixes :-)
1389                  *
1390                  * Note: in all cases where I have seen this so far
1391                  * it was a problem with the router configuration,
1392                  * for instance when a router was configured in the
1393                  * BOOTP reply, but the TFTP server was on the same
1394                  * subnet. So this is probably a warning that your
1395                  * configuration might be wrong. But I'm not really
1396                  * sure if there aren't any other situations.
1397                  */
1398                 if (ip->ip_p == IPPROTO_ICMP) {
1399                         ICMP_t *icmph = (ICMP_t *)&(ip->udp_src);
1400
1401                         switch (icmph->type) {
1402                         case ICMP_REDIRECT:
1403                         if (icmph->code != ICMP_REDIR_HOST)
1404                                 return;
1405                         puts (" ICMP Host Redirect to ");
1406                         print_IPaddr(icmph->un.gateway);
1407                         putc(' ');
1408                                 break;
1409 #if (CONFIG_COMMANDS & CFG_CMD_PING)
1410                         case ICMP_ECHO_REPLY:
1411                                 /*
1412                                  *      IP header OK.  Pass the packet to the current handler.
1413                                  */
1414                                 /* XXX point to ip packet */
1415                                 (*packetHandler)((uchar *)ip, 0, 0, 0);
1416                                 break;
1417 #endif
1418                         default:
1419                                 return;
1420                         }
1421                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1422                         return;
1423                 }
1424
1425 #ifdef CONFIG_NETCONSOLE
1426                 nc_input_packet((uchar *)ip +IP_HDR_SIZE,
1427                                                 ntohs(ip->udp_dst),
1428                                                 ntohs(ip->udp_src),
1429                                                 ntohs(ip->udp_len) - 8);
1430 #endif
1431                 /*
1432                  *      IP header OK.  Pass the packet to the current handler.
1433                  */
1434                 (*packetHandler)((uchar *)ip +IP_HDR_SIZE,
1435                                                 ntohs(ip->udp_dst),
1436                                                 ntohs(ip->udp_src),
1437                                                 ntohs(ip->udp_len) - 8);
1438                 break;
1439         }
1440 }
1441
1442
1443 /**********************************************************************/
1444
1445 static int net_check_prereq (proto_t protocol)
1446 {
1447         switch (protocol) {
1448                 /* Fall through */
1449 #if (CONFIG_COMMANDS & CFG_CMD_PING)
1450         case PING:
1451                 if (NetPingIP == 0) {
1452                         puts ("*** ERROR: ping address not given\n");
1453                         return (1);
1454                 }
1455                 goto common;
1456 #endif
1457 #if (CONFIG_COMMANDS & CFG_CMD_SNTP)
1458         case SNTP:
1459                 if (NetNtpServerIP == 0) {
1460                         puts ("*** ERROR: NTP server address not given\n");
1461                         return (1);
1462                 }
1463                 goto common;
1464 #endif
1465 #if (CONFIG_COMMANDS & CFG_CMD_NFS)
1466         case NFS:
1467 #endif
1468         case NETCONS:
1469         case TFTP:
1470                 if (NetServerIP == 0) {
1471                         puts ("*** ERROR: `serverip' not set\n");
1472                         return (1);
1473                 }
1474 #if (CONFIG_COMMANDS & (CFG_CMD_PING | CFG_CMD_SNTP))
1475               common:
1476 #endif
1477
1478                 if (NetOurIP == 0) {
1479                         puts ("*** ERROR: `ipaddr' not set\n");
1480                         return (1);
1481                 }
1482                 /* Fall through */
1483
1484         case DHCP:
1485         case RARP:
1486         case BOOTP:
1487         case CDP:
1488                 if (memcmp (NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
1489 #ifdef CONFIG_NET_MULTI
1490                         extern int eth_get_dev_index (void);
1491                         int num = eth_get_dev_index ();
1492
1493                         switch (num) {
1494                         case -1:
1495                                 puts ("*** ERROR: No ethernet found.\n");
1496                                 return (1);
1497                         case 0:
1498                                 puts ("*** ERROR: `ethaddr' not set\n");
1499                                 break;
1500                         default:
1501                                 printf ("*** ERROR: `eth%daddr' not set\n",
1502                                         num);
1503                                 break;
1504                         }
1505
1506                         NetStartAgain ();
1507                         return (2);
1508 #else
1509                         puts ("*** ERROR: `ethaddr' not set\n");
1510                         return (1);
1511 #endif
1512                 }
1513                 /* Fall through */
1514         default:
1515                 return (0);
1516         }
1517         return (0);             /* OK */
1518 }
1519 /**********************************************************************/
1520
1521 int
1522 NetCksumOk(uchar * ptr, int len)
1523 {
1524         return !((NetCksum(ptr, len) + 1) & 0xfffe);
1525 }
1526
1527
1528 unsigned
1529 NetCksum(uchar * ptr, int len)
1530 {
1531         ulong   xsum;
1532
1533         xsum = 0;
1534         while (len-- > 0)
1535                 xsum += *((ushort *)ptr)++;
1536         xsum = (xsum & 0xffff) + (xsum >> 16);
1537         xsum = (xsum & 0xffff) + (xsum >> 16);
1538         return (xsum & 0xffff);
1539 }
1540
1541 int
1542 NetEthHdrSize(void)
1543 {
1544         ushort myvlanid;
1545
1546         myvlanid = ntohs(NetOurVLAN);
1547         if (myvlanid == (ushort)-1)
1548                 myvlanid = VLAN_NONE;
1549
1550         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : VLAN_ETHER_HDR_SIZE;
1551 }
1552
1553 int
1554 NetSetEther(volatile uchar * xet, uchar * addr, uint prot)
1555 {
1556         Ethernet_t *et = (Ethernet_t *)xet;
1557         ushort myvlanid;
1558
1559         myvlanid = ntohs(NetOurVLAN);
1560         if (myvlanid == (ushort)-1)
1561                 myvlanid = VLAN_NONE;
1562
1563         memcpy (et->et_dest, addr, 6);
1564         memcpy (et->et_src, NetOurEther, 6);
1565         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1566         et->et_protlen = htons(prot);
1567                 return ETHER_HDR_SIZE;
1568         } else {
1569                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet;
1570
1571                 vet->vet_vlan_type = htons(PROT_VLAN);
1572                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1573                 vet->vet_type = htons(prot);
1574                 return VLAN_ETHER_HDR_SIZE;
1575         }
1576 }
1577
1578 void
1579 NetSetIP(volatile uchar * xip, IPaddr_t dest, int dport, int sport, int len)
1580 {
1581         volatile IP_t *ip = (IP_t *)xip;
1582
1583         /*
1584          *      If the data is an odd number of bytes, zero the
1585          *      byte after the last byte so that the checksum
1586          *      will work.
1587          */
1588         if (len & 1)
1589                 xip[IP_HDR_SIZE + len] = 0;
1590
1591         /*
1592          *      Construct an IP and UDP header.
1593          *      (need to set no fragment bit - XXX)
1594          */
1595         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
1596         ip->ip_tos   = 0;
1597         ip->ip_len   = htons(IP_HDR_SIZE + len);
1598         ip->ip_id    = htons(NetIPID++);
1599         ip->ip_off   = htons(0x4000);   /* No fragmentation */
1600         ip->ip_ttl   = 255;
1601         ip->ip_p     = 17;              /* UDP */
1602         ip->ip_sum   = 0;
1603         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
1604         NetCopyIP((void*)&ip->ip_dst, &dest);      /* - "" - */
1605         ip->udp_src  = htons(sport);
1606         ip->udp_dst  = htons(dport);
1607         ip->udp_len  = htons(8 + len);
1608         ip->udp_xsum = 0;
1609         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
1610 }
1611
1612 void copy_filename (uchar *dst, uchar *src, int size)
1613 {
1614         if (*src && (*src == '"')) {
1615                 ++src;
1616                 --size;
1617         }
1618
1619         while ((--size > 0) && *src && (*src != '"')) {
1620                 *dst++ = *src++;
1621         }
1622         *dst = '\0';
1623 }
1624
1625 #endif /* CFG_CMD_NET */
1626
1627 void ip_to_string (IPaddr_t x, char *s)
1628 {
1629         x = ntohl (x);
1630         sprintf (s, "%d.%d.%d.%d",
1631                  (int) ((x >> 24) & 0xff),
1632                  (int) ((x >> 16) & 0xff),
1633                  (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
1634         );
1635 }
1636
1637 IPaddr_t string_to_ip(char *s)
1638 {
1639         IPaddr_t addr;
1640         char *e;
1641         int i;
1642
1643         if (s == NULL)
1644                 return(0);
1645
1646         for (addr=0, i=0; i<4; ++i) {
1647                 ulong val = s ? simple_strtoul(s, &e, 10) : 0;
1648                 addr <<= 8;
1649                 addr |= (val & 0xFF);
1650                 if (s) {
1651                         s = (*e) ? e+1 : e;
1652                 }
1653         }
1654
1655         return (htonl(addr));
1656 }
1657
1658 void VLAN_to_string(ushort x, char *s)
1659 {
1660         x = ntohs(x);
1661
1662         if (x == (ushort)-1)
1663                 x = VLAN_NONE;
1664
1665         if (x == VLAN_NONE)
1666                 strcpy(s, "none");
1667         else
1668                 sprintf(s, "%d", x & VLAN_IDMASK);
1669 }
1670
1671 ushort string_to_VLAN(char *s)
1672 {
1673         ushort id;
1674
1675         if (s == NULL)
1676                 return htons(VLAN_NONE);
1677
1678         if (*s < '0' || *s > '9')
1679                 id = VLAN_NONE;
1680         else
1681                 id = (ushort)simple_strtoul(s, NULL, 10);
1682
1683         return htons(id);
1684 }
1685
1686 void print_IPaddr (IPaddr_t x)
1687 {
1688         char tmp[16];
1689
1690         ip_to_string (x, tmp);
1691
1692         puts (tmp);
1693 }
1694
1695 IPaddr_t getenv_IPaddr (char *var)
1696 {
1697         return (string_to_ip(getenv(var)));
1698 }
1699
1700 ushort getenv_VLAN(char *var)
1701 {
1702         return (string_to_VLAN(getenv(var)));
1703 }