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                         BootpTry = 0;
 385                         NetOurIP = 0;
 386                         NetServerIP = getenv_IPaddr ("serverip");
 387                         DhcpRequest();          /* Basically same as BOOTP */
 388                         break;
 389 #endif /* CFG_CMD_DHCP */
 390
 391                 case BOOTP:
 392                         BootpTry = 0;
 393                         BootpRequest ();
 394                         break;
 395
 396                 case RARP:
 397                         RarpTry = 0;
 398                         RarpRequest ();
 399                         break;
 400 #if (CONFIG_COMMANDS & CFG_CMD_PING)
 401                 case PING:
 402                         PingStart();
 403                         break;
 404 #endif
 405 #if (CONFIG_COMMANDS & CFG_CMD_NFS)
 406                 case NFS:
 407                         NfsStart();
 408                         break;
 409 #endif
 410 #if (CONFIG_COMMANDS & CFG_CMD_CDP)
 411                 case CDP:
 412                         CDPStart();
 413                         break;
 414 #endif
 415 #ifdef CONFIG_NETCONSOLE
 416                 case NETCONS:
 417                         NcStart();
 418                         break;
 419 #endif
 420                 default:
 421                         break;
 422                 }
 423
 424                 NetBootFileXferSize = 0;
 425                 break;
 426         }
 427
 428 #if defined(CONFIG_MII) || (CONFIG_COMMANDS & CFG_CMD_MII)
 429 #if defined(CFG_FAULT_ECHO_LINK_DOWN) && defined(CONFIG_STATUS_LED) && defined(STATUS_LED_RED)
 430         /*
 431          * Echo the inverted link state to the fault LED.
 432          */
 433         if(miiphy_link(CFG_FAULT_MII_ADDR)) {
 434                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 435         } else {
 436                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 437         }
 438 #endif /* CFG_FAULT_ECHO_LINK_DOWN, ... */
 439 #endif /* CONFIG_MII, ... */
 440
 441         /*
 442          *      Main packet reception loop.  Loop receiving packets until
 443          *      someone sets `NetQuit'.
 444          */
 445         for (;;) {
 446                 WATCHDOG_RESET();
 447 #ifdef CONFIG_SHOW_ACTIVITY
 448                 {
 449                         extern void show_activity(int arg);
 450                         show_activity(1);
 451                 }
 452 #endif
 453                 /*
 454                  *      Check the ethernet for a new packet.  The ethernet
 455                  *      receive routine will process it.
 456                  */
 457                         eth_rx();
 458
 459                 /*
 460                  *      Abort if ctrl-c was pressed.
 461                  */
 462                 if (ctrlc()) {
 463                         eth_halt();
 464                         puts ("\nAbort\n");
 465                         return (-1);
 466                 }
 467
 468                 ArpTimeoutCheck();
 469
 470                 /*
 471                  *      Check for a timeout, and run the timeout handler
 472                  *      if we have one.
 473                  */
 474                 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
 475                         thand_f *x;
 476
 477 #if defined(CONFIG_MII) || (CONFIG_COMMANDS & CFG_CMD_MII)
 478 #if defined(CFG_FAULT_ECHO_LINK_DOWN) && defined(CONFIG_STATUS_LED) && defined(STATUS_LED_RED)
 479                         /*
 480                          * Echo the inverted link state to the fault LED.
 481                          */
 482                         if(miiphy_link(CFG_FAULT_MII_ADDR)) {
 483                                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 484                         } else {
 485                                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 486                         }
 487 #endif /* CFG_FAULT_ECHO_LINK_DOWN, ... */
 488 #endif /* CONFIG_MII, ... */
 489                         x = timeHandler;
 490                         timeHandler = (thand_f *)0;
 491                         (*x)();
 492                 }
 493
 494
 495                 switch (NetState) {
 496
 497                 case NETLOOP_RESTART:
 498 #ifdef CONFIG_NET_MULTI
 499                         NetRestarted = 1;
 500 #endif
 501                         goto restart;
 502
 503                 case NETLOOP_SUCCESS:
 504                         if (NetBootFileXferSize > 0) {
 505                                 char buf[10];
 506                                 printf("Bytes transferred = %ld (%lx hex)\n",
 507                                         NetBootFileXferSize,
 508                                         NetBootFileXferSize);
 509                                 sprintf(buf, "%lx", NetBootFileXferSize);
 510                                 setenv("filesize", buf);
 511
 512                                 sprintf(buf, "%lX", (unsigned long)load_addr);
 513                                 setenv("fileaddr", buf);
 514                         }
 515                         eth_halt();
 516                         return NetBootFileXferSize;
 517
 518                 case NETLOOP_FAIL:
 519                         return (-1);
 520                 }
 521         }
 522 }
 523
 524 /**********************************************************************/
 525
 526 static void
 527 startAgainTimeout(void)
 528 {
 529         NetState = NETLOOP_RESTART;
 530 }
 531
 532 static void
 533 startAgainHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
 534 {
 535         /* Totally ignore the packet */
 536 }
 537
 538 void NetStartAgain (void)
 539 {
 540 #ifdef  CONFIG_NET_MULTI
 541         DECLARE_GLOBAL_DATA_PTR;
 542 #endif
 543         char *nretry;
 544         int noretry = 0, once = 0;
 545
 546         if ((nretry = getenv ("netretry")) != NULL) {
 547                 noretry = (strcmp (nretry, "no") == 0);
 548                 once = (strcmp (nretry, "once") == 0);
 549         }
 550         if (noretry) {
 551                 eth_halt ();
 552                 NetState = NETLOOP_FAIL;
 553                 return;
 554         }
 555 #ifndef CONFIG_NET_MULTI
 556         NetSetTimeout (10 * CFG_HZ, startAgainTimeout);
 557         NetSetHandler (startAgainHandler);
 558 #else   /* !CONFIG_NET_MULTI*/
 559         eth_halt ();
 560         eth_try_another (!NetRestarted);
 561         eth_init (gd->bd);
 562         if (NetRestartWrap) {
 563                 NetRestartWrap = 0;
 564                 if (NetDevExists && !once) {
 565                         NetSetTimeout (10 * CFG_HZ, startAgainTimeout);
 566                         NetSetHandler (startAgainHandler);
 567                 } else {
 568                         NetState = NETLOOP_FAIL;
 569                 }
 570         } else {
 571                 NetState = NETLOOP_RESTART;
 572         }
 573 #endif  /* CONFIG_NET_MULTI */
 574 }
 575
 576 /**********************************************************************/
 577 /*
 578  *      Miscelaneous bits.
 579  */
 580
 581 void
 582 NetSetHandler(rxhand_f * f)
 583 {
 584         packetHandler = f;
 585 }
 586
 587
 588 void
 589 NetSetTimeout(ulong iv, thand_f * f)
 590 {
 591         if (iv == 0) {
 592                 timeHandler = (thand_f *)0;
 593         } else {
 594                 timeHandler = f;
 595                 timeStart = get_timer(0);
 596                 timeDelta = iv;
 597         }
 598 }
 599
 600
 601 void
 602 NetSendPacket(volatile uchar * pkt, int len)
 603 {
 604         (void) eth_send(pkt, len);
 605 }
 606
 607 int
 608 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
 609 {
 610         uchar *pkt;
 611
 612         /* convert to new style broadcast */
 613         if (dest == 0)
 614                 dest = 0xFFFFFFFF;
 615
 616         /* if broadcast, make the ether address a broadcast and don't do ARP */
 617         if (dest == 0xFFFFFFFF)
 618                 ether = NetBcastAddr;
 619
 620         /* if MAC address was not discovered yet, save the packet and do an ARP request */
 621         if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
 622
 623 #ifdef ET_DEBUG
 624                 printf("sending ARP for %08lx\n", dest);
 625 #endif
 626                 NetArpWaitPacketIP = dest;
 627                 NetArpWaitPacketMAC = ether;
 628
 629                 pkt = NetArpWaitTxPacket;
 630                 pkt += NetSetEther (pkt, NetArpWaitPacketMAC, PROT_IP);
 631
 632                 NetSetIP (pkt, dest, dport, sport, len);
 633                 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len);
 634
 635                 /* size of the waiting packet */
 636                 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE + len;
 637
 638                 /* and do the ARP request */
 639                 NetArpWaitTry = 1;
 640                 NetArpWaitTimerStart = get_timer(0);
 641                 ArpRequest();
 642                 return 1;       /* waiting */
 643         }
 644
 645 #ifdef ET_DEBUG
 646         printf("sending UDP to %08lx/%02x:%02x:%02x:%02x:%02x:%02x\n",
 647                 dest, ether[0], ether[1], ether[2], ether[3], ether[4], ether[5]);
 648 #endif
 649
 650         pkt = (uchar *)NetTxPacket;
 651         pkt += NetSetEther (pkt, ether, PROT_IP);
 652         NetSetIP (pkt, dest, dport, sport, len);
 653         (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len);
 654
 655         return 0;       /* transmitted */
 656 }
 657
 658 #if (CONFIG_COMMANDS & CFG_CMD_PING)
 659 static ushort PingSeqNo;
 660
 661 int PingSend(void)
 662 {
 663         static uchar mac[6];
 664         volatile IP_t *ip;
 665         volatile ushort *s;
 666         uchar *pkt;
 667
 668         /* XXX always send arp request */
 669
 670         memcpy(mac, NetEtherNullAddr, 6);
 671
 672 #ifdef ET_DEBUG
 673         printf("sending ARP for %08lx\n", NetPingIP);
 674 #endif
 675
 676         NetArpWaitPacketIP = NetPingIP;
 677         NetArpWaitPacketMAC = mac;
 678
 679         pkt = NetArpWaitTxPacket;
 680         pkt += NetSetEther(pkt, mac, PROT_IP);
 681
 682         ip = (volatile IP_t *)pkt;
 683
 684         /*
 685          *      Construct an IP and ICMP header.  (need to set no fragment bit - XXX)
 686          */
 687         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
 688         ip->ip_tos   = 0;
 689         ip->ip_len   = htons(IP_HDR_SIZE_NO_UDP + 8);
 690         ip->ip_id    = htons(NetIPID++);
 691         ip->ip_off   = htons(0x4000);   /* No fragmentation */
 692         ip->ip_ttl   = 255;
 693         ip->ip_p     = 0x01;            /* ICMP */
 694         ip->ip_sum   = 0;
 695         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
 696         NetCopyIP((void*)&ip->ip_dst, &NetPingIP);         /* - "" - */
 697         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
 698
 699         s = &ip->udp_src;               /* XXX ICMP starts here */
 700         s[0] = htons(0x0800);           /* echo-request, code */
 701         s[1] = 0;                       /* checksum */
 702         s[2] = 0;                       /* identifier */
 703         s[3] = htons(PingSeqNo++);      /* sequence number */
 704         s[1] = ~NetCksum((uchar *)s, 8/2);
 705
 706         /* size of the waiting packet */
 707         NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8;
 708
 709         /* and do the ARP request */
 710         NetArpWaitTry = 1;
 711         NetArpWaitTimerStart = get_timer(0);
 712         ArpRequest();
 713         return 1;       /* waiting */
 714 }
 715
 716 static void
 717 PingTimeout (void)
 718 {
 719         eth_halt();
 720         NetState = NETLOOP_FAIL;        /* we did not get the reply */
 721 }
 722
 723 static void
 724 PingHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
 725 {
 726         IPaddr_t tmp;
 727         volatile IP_t *ip = (volatile IP_t *)pkt;
 728
 729         tmp = NetReadIP((void *)&ip->ip_src);
 730         if (tmp != NetPingIP)
 731                 return;
 732
 733         NetState = NETLOOP_SUCCESS;
 734 }
 735
 736 static void PingStart(void)
 737 {
 738 #if defined(CONFIG_NET_MULTI)
 739         printf ("Using %s device\n", eth_get_name());
 740 #endif  /* CONFIG_NET_MULTI */
 741         NetSetTimeout (10 * CFG_HZ, PingTimeout);
 742         NetSetHandler (PingHandler);
 743
 744         PingSend();
 745 }
 746 #endif  /* CFG_CMD_PING */
 747
 748 #if (CONFIG_COMMANDS & CFG_CMD_CDP)
 749
 750 #define CDP_DEVICE_ID_TLV               0x0001
 751 #define CDP_ADDRESS_TLV                 0x0002
 752 #define CDP_PORT_ID_TLV                 0x0003
 753 #define CDP_CAPABILITIES_TLV            0x0004
 754 #define CDP_VERSION_TLV                 0x0005
 755 #define CDP_PLATFORM_TLV                0x0006
 756 #define CDP_NATIVE_VLAN_TLV             0x000a
 757 #define CDP_APPLIANCE_VLAN_TLV          0x000e
 758 #define CDP_TRIGGER_TLV                 0x000f
 759 #define CDP_POWER_CONSUMPTION_TLV       0x0010
 760 #define CDP_SYSNAME_TLV                 0x0014
 761 #define CDP_SYSOBJECT_TLV               0x0015
 762 #define CDP_MANAGEMENT_ADDRESS_TLV      0x0016
 763
 764 #define CDP_TIMEOUT                     (CFG_HZ/4)      /* one packet every 250ms */
 765
 766 static int CDPSeq;
 767 static int CDPOK;
 768
 769 ushort CDPNativeVLAN;
 770 ushort CDPApplianceVLAN;
 771
 772 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 0x00 };
 773
 774 static ushort CDP_compute_csum(const uchar *buff, ushort len)
 775 {
 776         ushort csum;
 777         int     odd;
 778         ulong   result = 0;
 779         ushort  leftover;
 780
 781         if (len > 0) {
 782                 odd = 1 & (ulong)buff;
 783                 if (odd) {
 784                         result = *buff << 8;
 785                         len--;
 786                         buff++;
 787                 }
 788                 while (len > 1) {
 789                         result += *((const ushort *)buff)++;
 790                         if (result & 0x80000000)
 791                                 result = (result & 0xFFFF) + (result >> 16);
 792                         len -= 2;
 793                 }
 794                 if (len) {
 795                         leftover = (signed short)(*(const signed char *)buff);
 796                         /* * XXX CISCO SUCKS big time! (and blows too) */
 797                         result = (result & 0xffff0000) | ((result + leftover) & 0x0000ffff);
 798                 }
 799                 while (result >> 16)
 800                         result = (result & 0xFFFF) + (result >> 16);
 801
 802                 if (odd)
 803                         result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
 804         }
 805
 806         /* add up 16-bit and 17-bit words for 17+c bits */
 807         result = (result & 0xffff) + (result >> 16);
 808         /* add up 16-bit and 2-bit for 16+c bit */
 809         result = (result & 0xffff) + (result >> 16);
 810         /* add up carry.. */
 811         result = (result & 0xffff) + (result >> 16);
 812
 813         /* negate */
 814         csum = ~(ushort)result;
 815
 816         /* run time endian detection */
 817         if (csum != htons(csum))        /* little endian */
 818                 csum = htons(csum);
 819
 820         return csum;
 821 }
 822
 823 int CDPSendTrigger(void)
 824 {
 825         volatile uchar *pkt;
 826         volatile ushort *s;
 827         volatile ushort *cp;
 828         Ethernet_t *et;
 829         int len;
 830         ushort chksum;
 831 #if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID)   || \
 832     defined(CONFIG_CDP_VERSION)   || defined(CONFIG_CDP_PLATFORM)
 833         char buf[32];
 834 #endif
 835
 836         pkt = NetTxPacket;
 837         et = (Ethernet_t *)pkt;
 838
 839         /* NOTE: trigger sent not on any VLAN */
 840
 841         /* form ethernet header */
 842         memcpy(et->et_dest, NetCDPAddr, 6);
 843         memcpy(et->et_src, NetOurEther, 6);
 844
 845         pkt += ETHER_HDR_SIZE;
 846
 847         /* SNAP header */
 848         memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr));
 849         pkt += sizeof(CDP_SNAP_hdr);
 850
 851         /* CDP header */
 852         *pkt++ = 0x02;                          /* CDP version 2 */
 853         *pkt++ = 180;                           /* TTL */
 854         s = (volatile ushort *)pkt;
 855         cp = s;
 856         *s++ = htons(0);                        /* checksum (0 for later calculation) */
 857
 858         /* CDP fields */
 859 #ifdef CONFIG_CDP_DEVICE_ID
 860         *s++ = htons(CDP_DEVICE_ID_TLV);
 861         *s++ = htons(CONFIG_CDP_DEVICE_ID);
 862         memset(buf, 0, sizeof(buf));
 863         sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%02X%02X%02X%02X%02X%02X",
 864                 NetOurEther[0] & 0xff, NetOurEther[1] & 0xff,
 865                 NetOurEther[2] & 0xff, NetOurEther[3] & 0xff,
 866                 NetOurEther[4] & 0xff, NetOurEther[5] & 0xff);
 867         memcpy((uchar *)s, buf, 16);
 868         s += 16 / 2;
 869 #endif
 870
 871 #ifdef CONFIG_CDP_PORT_ID
 872         *s++ = htons(CDP_PORT_ID_TLV);
 873         memset(buf, 0, sizeof(buf));
 874         sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index());
 875         len = strlen(buf);
 876         if (len & 1)    /* make it even */
 877                 len++;
 878         *s++ = htons(len + 4);
 879         memcpy((uchar *)s, buf, len);
 880         s += len / 2;
 881 #endif
 882
 883 #ifdef CONFIG_CDP_CAPABILITIES
 884         *s++ = htons(CDP_CAPABILITIES_TLV);
 885         *s++ = htons(8);
 886         *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES);
 887         s += 2;
 888 #endif
 889
 890 #ifdef CONFIG_CDP_VERSION
 891         *s++ = htons(CDP_VERSION_TLV);
 892         memset(buf, 0, sizeof(buf));
 893         strcpy(buf, CONFIG_CDP_VERSION);
 894         len = strlen(buf);
 895         if (len & 1)    /* make it even */
 896                 len++;
 897         *s++ = htons(len + 4);
 898         memcpy((uchar *)s, buf, len);
 899         s += len / 2;
 900 #endif
 901
 902 #ifdef CONFIG_CDP_PLATFORM
 903         *s++ = htons(CDP_PLATFORM_TLV);
 904         memset(buf, 0, sizeof(buf));
 905         strcpy(buf, CONFIG_CDP_PLATFORM);
 906         len = strlen(buf);
 907         if (len & 1)    /* make it even */
 908                 len++;
 909         *s++ = htons(len + 4);
 910         memcpy((uchar *)s, buf, len);
 911         s += len / 2;
 912 #endif
 913
 914 #ifdef CONFIG_CDP_TRIGGER
 915         *s++ = htons(CDP_TRIGGER_TLV);
 916         *s++ = htons(8);
 917         *(ulong *)s = htonl(CONFIG_CDP_TRIGGER);
 918         s += 2;
 919 #endif
 920
 921 #ifdef CONFIG_CDP_POWER_CONSUMPTION
 922         *s++ = htons(CDP_POWER_CONSUMPTION_TLV);
 923         *s++ = htons(6);
 924         *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION);
 925 #endif
 926
 927         /* length of ethernet packet */
 928         len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE);
 929         et->et_protlen = htons(len);
 930
 931         len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr);
 932         chksum = CDP_compute_csum((uchar *)NetTxPacket + len, (uchar *)s - (NetTxPacket + len));
 933         if (chksum == 0)
 934                 chksum = 0xFFFF;
 935         *cp = htons(chksum);
 936
 937         (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket);
 938         return 0;
 939 }
 940
 941 static void
 942 CDPTimeout (void)
 943 {
 944         CDPSeq++;
 945
 946         if (CDPSeq < 3) {
 947                 NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
 948                 CDPSendTrigger();
 949                 return;
 950         }
 951
 952         /* if not OK try again */
 953         if (!CDPOK)
 954                 NetStartAgain();
 955         else
 956                 NetState = NETLOOP_SUCCESS;
 957 }
 958
 959 static void
 960 CDPDummyHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
 961 {
 962         /* nothing */
 963 }
 964
 965 static void
 966 CDPHandler(const uchar * pkt, unsigned len)
 967 {
 968         const uchar *t;
 969         const ushort *ss;
 970         ushort type, tlen;
 971         uchar applid;
 972         ushort vlan, nvlan;
 973
 974         /* minimum size? */
 975         if (len < sizeof(CDP_SNAP_hdr) + 4)
 976                 goto pkt_short;
 977
 978         /* check for valid CDP SNAP header */
 979         if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0)
 980                 return;
 981
 982         pkt += sizeof(CDP_SNAP_hdr);
 983         len -= sizeof(CDP_SNAP_hdr);
 984
 985         /* Version of CDP protocol must be >= 2 and TTL != 0 */
 986         if (pkt[0] < 0x02 || pkt[1] == 0)
 987                 return;
 988
 989         /* if version is greater than 0x02 maybe we'll have a problem; output a warning */
 990         if (pkt[0] != 0x02)
 991                 printf("** WARNING: CDP packet received with a protocol version %d > 2\n",
 992                                 pkt[0] & 0xff);
 993
 994         if (CDP_compute_csum(pkt, len) != 0)
 995                 return;
 996
 997         pkt += 4;
 998         len -= 4;
 999
1000         vlan = htons(-1);
1001         nvlan = htons(-1);
1002         while (len > 0) {
1003                 if (len < 4)
1004                         goto pkt_short;
1005
1006                 ss = (const ushort *)pkt;
1007                 type = ntohs(ss[0]);
1008                 tlen = ntohs(ss[1]);
1009                 if (tlen > len) {
1010                         goto pkt_short;
1011                 }
1012
1013                 pkt += tlen;
1014                 len -= tlen;
1015
1016                 ss += 2;        /* point ss to the data of the TLV */
1017                 tlen -= 4;
1018
1019                 switch (type) {
1020                         case CDP_DEVICE_ID_TLV:
1021                                 break;
1022                         case CDP_ADDRESS_TLV:
1023                                 break;
1024                         case CDP_PORT_ID_TLV:
1025                                 break;
1026                         case CDP_CAPABILITIES_TLV:
1027                                 break;
1028                         case CDP_VERSION_TLV:
1029                                 break;
1030                         case CDP_PLATFORM_TLV:
1031                                 break;
1032                         case CDP_NATIVE_VLAN_TLV:
1033                                 nvlan = *ss;
1034                                 break;
1035                         case CDP_APPLIANCE_VLAN_TLV:
1036                                 t = (const uchar *)ss;
1037                                 while (tlen > 0) {
1038                                         if (tlen < 3)
1039                                                 goto pkt_short;
1040
1041                                         applid = t[0];
1042                                         ss = (const ushort *)(t + 1);
1043
1044 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE
1045                                         if (applid == CONFIG_CDP_APPLIANCE_VLAN_TYPE)
1046                                                 vlan = *ss;
1047 #else
1048                                         vlan = ntohs(*ss);      /* XXX will this work; dunno */
1049 #endif
1050                                         t += 3; tlen -= 3;
1051                                 }
1052                                 break;
1053                         case CDP_TRIGGER_TLV:
1054                                 break;
1055                         case CDP_POWER_CONSUMPTION_TLV:
1056                                 break;
1057                         case CDP_SYSNAME_TLV:
1058                                 break;
1059                         case CDP_SYSOBJECT_TLV:
1060                                 break;
1061                         case CDP_MANAGEMENT_ADDRESS_TLV:
1062                                 break;
1063                 }
1064         }
1065
1066         CDPApplianceVLAN = vlan;
1067         CDPNativeVLAN = nvlan;
1068
1069         CDPOK = 1;
1070         return;
1071
1072  pkt_short:
1073         printf("** CDP packet is too short\n");
1074         return;
1075 }
1076
1077 static void CDPStart(void)
1078 {
1079 #if defined(CONFIG_NET_MULTI)
1080         printf ("Using %s device\n", eth_get_name());
1081 #endif
1082         CDPSeq = 0;
1083         CDPOK = 0;
1084
1085         CDPNativeVLAN = htons(-1);
1086         CDPApplianceVLAN = htons(-1);
1087
1088         NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
1089         NetSetHandler (CDPDummyHandler);
1090
1091         CDPSendTrigger();
1092 }
1093 #endif  /* CFG_CMD_CDP */
1094
1095
1096 void
1097 NetReceive(volatile uchar * inpkt, int len)
1098 {
1099         Ethernet_t *et;
1100         IP_t    *ip;
1101         ARP_t   *arp;
1102         IPaddr_t tmp;
1103         int     x;
1104         uchar *pkt;
1105 #if (CONFIG_COMMANDS & CFG_CMD_CDP)
1106         int iscdp;
1107 #endif
1108         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1109
1110 #ifdef ET_DEBUG
1111         printf("packet received\n");
1112 #endif
1113
1114         NetRxPkt = inpkt;
1115         NetRxPktLen = len;
1116         et = (Ethernet_t *)inpkt;
1117
1118         /* too small packet? */
1119         if (len < ETHER_HDR_SIZE)
1120                 return;
1121
1122 #if (CONFIG_COMMANDS & CFG_CMD_CDP)
1123         /* keep track if packet is CDP */
1124         iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0;
1125 #endif
1126
1127         myvlanid = ntohs(NetOurVLAN);
1128         if (myvlanid == (ushort)-1)
1129                 myvlanid = VLAN_NONE;
1130         mynvlanid = ntohs(NetOurNativeVLAN);
1131         if (mynvlanid == (ushort)-1)
1132                 mynvlanid = VLAN_NONE;
1133
1134         x = ntohs(et->et_protlen);
1135
1136 #ifdef ET_DEBUG
1137         printf("packet received\n");
1138 #endif
1139
1140         if (x < 1514) {
1141                 /*
1142                  *      Got a 802 packet.  Check the other protocol field.
1143                  */
1144                 x = ntohs(et->et_prot);
1145
1146                 ip = (IP_t *)(inpkt + E802_HDR_SIZE);
1147                 len -= E802_HDR_SIZE;
1148
1149         } else if (x != PROT_VLAN) {    /* normal packet */
1150                 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE);
1151                 len -= ETHER_HDR_SIZE;
1152
1153         } else {                        /* VLAN packet */
1154                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et;
1155
1156 #ifdef ET_DEBUG
1157                 printf("VLAN packet received\n");
1158 #endif
1159                 /* too small packet? */
1160                 if (len < VLAN_ETHER_HDR_SIZE)
1161                         return;
1162
1163                 /* if no VLAN active */
1164                 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
1165 #if (CONFIG_COMMANDS & CFG_CMD_CDP)
1166                                 && iscdp == 0
1167 #endif
1168                                 )
1169                         return;
1170
1171                 cti = ntohs(vet->vet_tag);
1172                 vlanid = cti & VLAN_IDMASK;
1173                 x = ntohs(vet->vet_type);
1174
1175                 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE);
1176                 len -= VLAN_ETHER_HDR_SIZE;
1177         }
1178
1179 #ifdef ET_DEBUG
1180         printf("Receive from protocol 0x%x\n", x);
1181 #endif
1182
1183 #if (CONFIG_COMMANDS & CFG_CMD_CDP)
1184         if (iscdp) {
1185                 CDPHandler((uchar *)ip, len);
1186                 return;
1187         }
1188 #endif
1189
1190         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1191                 if (vlanid == VLAN_NONE)
1192                         vlanid = (mynvlanid & VLAN_IDMASK);
1193                 /* not matched? */
1194                 if (vlanid != (myvlanid & VLAN_IDMASK))
1195                         return;
1196         }
1197
1198         switch (x) {
1199
1200         case PROT_ARP:
1201                 /*
1202                  * We have to deal with two types of ARP packets:
1203                  * - REQUEST packets will be answered by sending  our
1204                  *   IP address - if we know it.
1205                  * - REPLY packates are expected only after we asked
1206                  *   for the TFTP server's or the gateway's ethernet
1207                  *   address; so if we receive such a packet, we set
1208                  *   the server ethernet address
1209                  */
1210 #ifdef ET_DEBUG
1211                 puts ("Got ARP\n");
1212 #endif
1213                 arp = (ARP_t *)ip;
1214                 if (len < ARP_HDR_SIZE) {
1215                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1216                         return;
1217                 }
1218                 if (ntohs(arp->ar_hrd) != ARP_ETHER) {
1219                         return;
1220                 }
1221                 if (ntohs(arp->ar_pro) != PROT_IP) {
1222                         return;
1223                 }
1224                 if (arp->ar_hln != 6) {
1225                         return;
1226                 }
1227                 if (arp->ar_pln != 4) {
1228                         return;
1229                 }
1230
1231                 if (NetOurIP == 0) {
1232                         return;
1233                 }
1234
1235                 if (NetReadIP(&arp->ar_data[16]) != NetOurIP) {
1236                         return;
1237                 }
1238
1239                 switch (ntohs(arp->ar_op)) {
1240                 case ARPOP_REQUEST:             /* reply with our IP address    */
1241 #ifdef ET_DEBUG
1242                         puts ("Got ARP REQUEST, return our IP\n");
1243 #endif
1244                         pkt = (uchar *)et;
1245                         pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
1246                         arp->ar_op = htons(ARPOP_REPLY);
1247                         memcpy   (&arp->ar_data[10], &arp->ar_data[0], 6);
1248                         NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
1249                         memcpy   (&arp->ar_data[ 0], NetOurEther, 6);
1250                         NetCopyIP(&arp->ar_data[ 6], &NetOurIP);
1251                         (void) eth_send((uchar *)et, (pkt - (uchar *)et) + ARP_HDR_SIZE);
1252                         return;
1253
1254                 case ARPOP_REPLY:               /* arp reply */
1255                         /* are we waiting for a reply */
1256                         if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
1257                                 break;
1258 #ifdef ET_DEBUG
1259                         printf("Got ARP REPLY, set server/gtwy eth addr (%02x:%02x:%02x:%02x:%02x:%02x)\n",
1260                                 arp->ar_data[0], arp->ar_data[1],
1261                                 arp->ar_data[2], arp->ar_data[3],
1262                                 arp->ar_data[4], arp->ar_data[5]);
1263 #endif
1264
1265                         tmp = NetReadIP(&arp->ar_data[6]);
1266
1267                         /* matched waiting packet's address */
1268                         if (tmp == NetArpWaitReplyIP) {
1269 #ifdef ET_DEBUG
1270                                 puts ("Got it\n");
1271 #endif
1272                                 /* save address for later use */
1273                                 memcpy(NetArpWaitPacketMAC, &arp->ar_data[0], 6);
1274
1275 #ifdef CONFIG_NETCONSOLE
1276                                 (*packetHandler)(0,0,0,0);
1277 #endif
1278                                 /* modify header, and transmit it */
1279                                 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6);
1280                                 (void) eth_send(NetArpWaitTxPacket, NetArpWaitTxPacketSize);
1281
1282                                 /* no arp request pending now */
1283                                 NetArpWaitPacketIP = 0;
1284                                 NetArpWaitTxPacketSize = 0;
1285                                 NetArpWaitPacketMAC = NULL;
1286
1287                         }
1288                         return;
1289                 default:
1290 #ifdef ET_DEBUG
1291                         printf("Unexpected ARP opcode 0x%x\n", ntohs(arp->ar_op));
1292 #endif
1293                         return;
1294                 }
1295                 break;
1296
1297         case PROT_RARP:
1298 #ifdef ET_DEBUG
1299                 puts ("Got RARP\n");
1300 #endif
1301                 arp = (ARP_t *)ip;
1302                 if (len < ARP_HDR_SIZE) {
1303                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1304                         return;
1305                 }
1306
1307                 if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
1308                         (ntohs(arp->ar_hrd) != ARP_ETHER)   ||
1309                         (ntohs(arp->ar_pro) != PROT_IP)     ||
1310                         (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
1311
1312                         puts ("invalid RARP header\n");
1313                 } else {
1314                         NetCopyIP(&NetOurIP,    &arp->ar_data[16]);
1315                         if (NetServerIP == 0)
1316                                 NetCopyIP(&NetServerIP, &arp->ar_data[ 6]);
1317                         memcpy (NetServerEther, &arp->ar_data[ 0], 6);
1318
1319                         (*packetHandler)(0,0,0,0);
1320                 }
1321                 break;
1322
1323         case PROT_IP:
1324 #ifdef ET_DEBUG
1325                 puts ("Got IP\n");
1326 #endif
1327                 if (len < IP_HDR_SIZE) {
1328                         debug ("len bad %d < %d\n", len, IP_HDR_SIZE);
1329                         return;
1330                 }
1331                 if (len < ntohs(ip->ip_len)) {
1332                         printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
1333                         return;
1334                 }
1335                 len = ntohs(ip->ip_len);
1336 #ifdef ET_DEBUG
1337                 printf("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
1338 #endif
1339                 if ((ip->ip_hl_v & 0xf0) != 0x40) {
1340                         return;
1341                 }
1342                 if (ip->ip_off & htons(0x1fff)) { /* Can't deal w/ fragments */
1343                         return;
1344                 }
1345                 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
1346                         puts ("checksum bad\n");
1347                         return;
1348                 }
1349                 tmp = NetReadIP(&ip->ip_dst);
1350                 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
1351                         return;
1352                 }
1353                 /*
1354                  * watch for ICMP host redirects
1355                  *
1356                  * There is no real handler code (yet). We just watch
1357                  * for ICMP host redirect messages. In case anybody
1358                  * sees these messages: please contact me
1359                  * (wd@denx.de), or - even better - send me the
1360                  * necessary fixes :-)
1361                  *
1362                  * Note: in all cases where I have seen this so far
1363                  * it was a problem with the router configuration,
1364                  * for instance when a router was configured in the
1365                  * BOOTP reply, but the TFTP server was on the same
1366                  * subnet. So this is probably a warning that your
1367                  * configuration might be wrong. But I'm not really
1368                  * sure if there aren't any other situations.
1369                  */
1370                 if (ip->ip_p == IPPROTO_ICMP) {
1371                         ICMP_t *icmph = (ICMP_t *)&(ip->udp_src);
1372
1373                         switch (icmph->type) {
1374                         case ICMP_REDIRECT:
1375                         if (icmph->code != ICMP_REDIR_HOST)
1376                                 return;
1377                         puts (" ICMP Host Redirect to ");
1378                         print_IPaddr(icmph->un.gateway);
1379                         putc(' ');
1380                                 break;
1381 #if (CONFIG_COMMANDS & CFG_CMD_PING)
1382                         case ICMP_ECHO_REPLY:
1383                                 /*
1384                                  *      IP header OK.  Pass the packet to the current handler.
1385                                  */
1386                                 /* XXX point to ip packet */
1387                                 (*packetHandler)((uchar *)ip, 0, 0, 0);
1388                                 break;
1389 #endif
1390                         default:
1391                                 return;
1392                         }
1393                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1394                         return;
1395                 }
1396
1397 #ifdef CONFIG_NETCONSOLE
1398                 nc_input_packet((uchar *)ip +IP_HDR_SIZE,
1399                                                 ntohs(ip->udp_dst),
1400                                                 ntohs(ip->udp_src),
1401                                                 ntohs(ip->udp_len) - 8);
1402 #endif
1403                 /*
1404                  *      IP header OK.  Pass the packet to the current handler.
1405                  */
1406                 (*packetHandler)((uchar *)ip +IP_HDR_SIZE,
1407                                                 ntohs(ip->udp_dst),
1408                                                 ntohs(ip->udp_src),
1409                                                 ntohs(ip->udp_len) - 8);
1410                 break;
1411         }
1412 }
1413
1414
1415 /**********************************************************************/
1416
1417 static int net_check_prereq (proto_t protocol)
1418 {
1419         switch (protocol) {
1420                 /* Fall through */
1421 #if (CONFIG_COMMANDS & CFG_CMD_PING)
1422         case PING:
1423                 if (NetPingIP == 0) {
1424                         puts ("*** ERROR: ping address not given\n");
1425                         return (1);
1426                 }
1427                 goto common;
1428 #endif
1429 #if (CONFIG_COMMANDS & CFG_CMD_NFS)
1430         case NFS:
1431 #endif
1432         case NETCONS:
1433         case TFTP:
1434                 if (NetServerIP == 0) {
1435                         puts ("*** ERROR: `serverip' not set\n");
1436                         return (1);
1437                 }
1438 #if (CONFIG_COMMANDS & CFG_CMD_PING)
1439               common:
1440 #endif
1441
1442                 if (NetOurIP == 0) {
1443                         puts ("*** ERROR: `ipaddr' not set\n");
1444                         return (1);
1445                 }
1446                 /* Fall through */
1447
1448         case DHCP:
1449         case RARP:
1450         case BOOTP:
1451         case CDP:
1452                 if (memcmp (NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
1453 #ifdef CONFIG_NET_MULTI
1454                         extern int eth_get_dev_index (void);
1455                         int num = eth_get_dev_index ();
1456
1457                         switch (num) {
1458                         case -1:
1459                                 puts ("*** ERROR: No ethernet found.\n");
1460                                 return (1);
1461                         case 0:
1462                                 puts ("*** ERROR: `ethaddr' not set\n");
1463                                 break;
1464                         default:
1465                                 printf ("*** ERROR: `eth%daddr' not set\n",
1466                                         num);
1467                                 break;
1468                         }
1469
1470                         NetStartAgain ();
1471                         return (2);
1472 #else
1473                         puts ("*** ERROR: `ethaddr' not set\n");
1474                         return (1);
1475 #endif
1476                 }
1477                 /* Fall through */
1478         default:
1479                 return (0);
1480         }
1481         return (0);             /* OK */
1482 }
1483 /**********************************************************************/
1484
1485 int
1486 NetCksumOk(uchar * ptr, int len)
1487 {
1488         return !((NetCksum(ptr, len) + 1) & 0xfffe);
1489 }
1490
1491
1492 unsigned
1493 NetCksum(uchar * ptr, int len)
1494 {
1495         ulong   xsum;
1496
1497         xsum = 0;
1498         while (len-- > 0)
1499                 xsum += *((ushort *)ptr)++;
1500         xsum = (xsum & 0xffff) + (xsum >> 16);
1501         xsum = (xsum & 0xffff) + (xsum >> 16);
1502         return (xsum & 0xffff);
1503 }
1504
1505 int
1506 NetEthHdrSize(void)
1507 {
1508         ushort myvlanid;
1509
1510         myvlanid = ntohs(NetOurVLAN);
1511         if (myvlanid == (ushort)-1)
1512                 myvlanid = VLAN_NONE;
1513
1514         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : VLAN_ETHER_HDR_SIZE;
1515 }
1516
1517 int
1518 NetSetEther(volatile uchar * xet, uchar * addr, uint prot)
1519 {
1520         Ethernet_t *et = (Ethernet_t *)xet;
1521         ushort myvlanid;
1522
1523         myvlanid = ntohs(NetOurVLAN);
1524         if (myvlanid == (ushort)-1)
1525                 myvlanid = VLAN_NONE;
1526
1527         memcpy (et->et_dest, addr, 6);
1528         memcpy (et->et_src, NetOurEther, 6);
1529         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1530         et->et_protlen = htons(prot);
1531                 return ETHER_HDR_SIZE;
1532         } else {
1533                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet;
1534
1535                 vet->vet_vlan_type = htons(PROT_VLAN);
1536                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1537                 vet->vet_type = htons(prot);
1538                 return VLAN_ETHER_HDR_SIZE;
1539         }
1540 }
1541
1542 void
1543 NetSetIP(volatile uchar * xip, IPaddr_t dest, int dport, int sport, int len)
1544 {
1545         volatile IP_t *ip = (IP_t *)xip;
1546
1547         /*
1548          *      If the data is an odd number of bytes, zero the
1549          *      byte after the last byte so that the checksum
1550          *      will work.
1551          */
1552         if (len & 1)
1553                 xip[IP_HDR_SIZE + len] = 0;
1554
1555         /*
1556          *      Construct an IP and UDP header.
1557          *      (need to set no fragment bit - XXX)
1558          */
1559         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
1560         ip->ip_tos   = 0;
1561         ip->ip_len   = htons(IP_HDR_SIZE + len);
1562         ip->ip_id    = htons(NetIPID++);
1563         ip->ip_off   = htons(0x4000);   /* No fragmentation */
1564         ip->ip_ttl   = 255;
1565         ip->ip_p     = 17;              /* UDP */
1566         ip->ip_sum   = 0;
1567         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
1568         NetCopyIP((void*)&ip->ip_dst, &dest);      /* - "" - */
1569         ip->udp_src  = htons(sport);
1570         ip->udp_dst  = htons(dport);
1571         ip->udp_len  = htons(8 + len);
1572         ip->udp_xsum = 0;
1573         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
1574 }
1575
1576 void copy_filename (uchar *dst, uchar *src, int size)
1577 {
1578         if (*src && (*src == '"')) {
1579                 ++src;
1580                 --size;
1581         }
1582
1583         while ((--size > 0) && *src && (*src != '"')) {
1584                 *dst++ = *src++;
1585         }
1586         *dst = '\0';
1587 }
1588
1589 #endif /* CFG_CMD_NET */
1590
1591 void ip_to_string (IPaddr_t x, char *s)
1592 {
1593         x = ntohl (x);
1594         sprintf (s, "%d.%d.%d.%d",
1595                  (int) ((x >> 24) & 0xff),
1596                  (int) ((x >> 16) & 0xff),
1597                  (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
1598         );
1599 }
1600
1601 IPaddr_t string_to_ip(char *s)
1602 {
1603         IPaddr_t addr;
1604         char *e;
1605         int i;
1606
1607         if (s == NULL)
1608                 return(0);
1609
1610         for (addr=0, i=0; i<4; ++i) {
1611                 ulong val = s ? simple_strtoul(s, &e, 10) : 0;
1612                 addr <<= 8;
1613                 addr |= (val & 0xFF);
1614                 if (s) {
1615                         s = (*e) ? e+1 : e;
1616                 }
1617         }
1618
1619         return (htonl(addr));
1620 }
1621
1622 void VLAN_to_string(ushort x, char *s)
1623 {
1624         x = ntohs(x);
1625
1626         if (x == (ushort)-1)
1627                 x = VLAN_NONE;
1628
1629         if (x == VLAN_NONE)
1630                 strcpy(s, "none");
1631         else
1632                 sprintf(s, "%d", x & VLAN_IDMASK);
1633 }
1634
1635 ushort string_to_VLAN(char *s)
1636 {
1637         ushort id;
1638
1639         if (s == NULL)
1640                 return htons(VLAN_NONE);
1641
1642         if (*s < '0' || *s > '9')
1643                 id = VLAN_NONE;
1644         else
1645                 id = (ushort)simple_strtoul(s, NULL, 10);
1646
1647         return htons(id);
1648 }
1649
1650 void print_IPaddr (IPaddr_t x)
1651 {
1652         char tmp[16];
1653
1654         ip_to_string (x, tmp);
1655
1656         puts (tmp);
1657 }
1658
1659 IPaddr_t getenv_IPaddr (char *var)
1660 {
1661         return (string_to_ip(getenv(var)));
1662 }
1663
1664 ushort getenv_VLAN(char *var)
1665 {
1666         return (string_to_VLAN(getenv(var)));
1667 }