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