net/net.c

   1 /*
   2  *      Copied from Linux Monitor (LiMon) - Networking.
   3  *
   4  *      Copyright 1994 - 2000 Neil Russell.
   5  *      (See License)
   6  *      Copyright 2000 Roland Borde
   7  *      Copyright 2000 Paolo Scaffardi
   8  *      Copyright 2000-2002 Wolfgang Denk, wd@denx.de
   9  */
  10
  11 /*
  12  * General Desription:
  13  *
  14  * The user interface supports commands for BOOTP, RARP, and TFTP.
  15  * Also, we support ARP internally. Depending on available data,
  16  * these interact as follows:
  17  *
  18  * BOOTP:
  19  *
  20  *      Prerequisites:  - own ethernet address
  21  *      We want:        - own IP address
  22  *                      - TFTP server IP address
  23  *                      - name of bootfile
  24  *      Next step:      ARP
  25  *
  26  * RARP:
  27  *
  28  *      Prerequisites:  - own ethernet address
  29  *      We want:        - own IP address
  30  *                      - TFTP server IP address
  31  *      Next step:      ARP
  32  *
  33  * ARP:
  34  *
  35  *      Prerequisites:  - own ethernet address
  36  *                      - own IP address
  37  *                      - TFTP server IP address
  38  *      We want:        - TFTP server ethernet address
  39  *      Next step:      TFTP
  40  *
  41  * DHCP:
  42  *
  43  *     Prerequisites:   - own ethernet address
  44  *     We want:         - IP, Netmask, ServerIP, Gateway IP
  45  *                      - bootfilename, lease time
  46  *     Next step:       - TFTP
  47  *
  48  * TFTP:
  49  *
  50  *      Prerequisites:  - own ethernet address
  51  *                      - own IP address
  52  *                      - TFTP server IP address
  53  *                      - TFTP server ethernet address
  54  *                      - name of bootfile (if unknown, we use a default name
  55  *                        derived from our own IP address)
  56  *      We want:        - load the boot file
  57  *      Next step:      none
  58  *
  59  * NFS:
  60  *
  61  *      Prerequisites:  - own ethernet address
  62  *                      - own IP address
  63  *                      - name of bootfile (if unknown, we use a default name
  64  *                        derived from our own IP address)
  65  *      We want:        - load the boot file
  66  *      Next step:      none
  67  *
  68  * SNTP:
  69  *
  70  *      Prerequisites:  - own ethernet address
  71  *                      - own IP address
  72  *      We want:        - network time
  73  *      Next step:      none
  74  */
  75
  76
  77 #include <common.h>
  78 #include <watchdog.h>
  79 #include <command.h>
  80 #include <net.h>
  81 #include "bootp.h"
  82 #include "tftp.h"
  83 #include "rarp.h"
  84 #include "nfs.h"
  85 #ifdef CONFIG_STATUS_LED
  86 #include <status_led.h>
  87 #include <miiphy.h>
  88 #endif
  89 #if defined(CONFIG_CMD_SNTP)
  90 #include "sntp.h"
  91 #endif
  92
  93 #if defined(CONFIG_CMD_NET)
  94
  95 DECLARE_GLOBAL_DATA_PTR;
  96
  97 #define ARP_TIMEOUT             5UL             /* Seconds before trying ARP again */
  98 #ifndef CONFIG_NET_RETRY_COUNT
  99 # define ARP_TIMEOUT_COUNT      5               /* # of timeouts before giving up  */
 100 #else
 101 # define ARP_TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT)
 102 #endif
 103
 104 #if 0
 105 #define ET_DEBUG
 106 #endif
 107
 108 /** BOOTP EXTENTIONS **/
 109
 110 IPaddr_t        NetOurSubnetMask=0;             /* Our subnet mask (0=unknown)  */
 111 IPaddr_t        NetOurGatewayIP=0;              /* Our gateways IP address      */
 112 IPaddr_t        NetOurDNSIP=0;                  /* Our DNS IP address           */
 113 #if defined(CONFIG_BOOTP_DNS2)
 114 IPaddr_t        NetOurDNS2IP=0;                 /* Our 2nd DNS IP address       */
 115 #endif
 116 char            NetOurNISDomain[32]={0,};       /* Our NIS domain               */
 117 char            NetOurHostName[32]={0,};        /* Our hostname                 */
 118 char            NetOurRootPath[64]={0,};        /* Our bootpath                 */
 119 ushort          NetBootFileSize=0;              /* Our bootfile size in blocks  */
 120
 121 #ifdef CONFIG_MCAST_TFTP        /* Multicast TFTP */
 122 IPaddr_t Mcast_addr;
 123 #endif
 124
 125 /** END OF BOOTP EXTENTIONS **/
 126
 127 ulong           NetBootFileXferSize;    /* The actual transferred size of the bootfile (in bytes) */
 128 uchar           NetOurEther[6];         /* Our ethernet address                 */
 129 uchar           NetServerEther[6] =     /* Boot server enet address             */
 130                         { 0, 0, 0, 0, 0, 0 };
 131 IPaddr_t        NetOurIP;               /* Our IP addr (0 = unknown)            */
 132 IPaddr_t        NetServerIP;            /* Our IP addr (0 = unknown)            */
 133 volatile uchar *NetRxPkt;               /* Current receive packet               */
 134 int             NetRxPktLen;            /* Current rx packet length             */
 135 unsigned        NetIPID;                /* IP packet ID                         */
 136 uchar           NetBcastAddr[6] =       /* Ethernet bcast address               */
 137                         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 138 uchar           NetEtherNullAddr[6] =
 139                         { 0, 0, 0, 0, 0, 0 };
 140 #ifdef CONFIG_API
 141 void            (*push_packet)(volatile void *, int len) = 0;
 142 #endif
 143 #if defined(CONFIG_CMD_CDP)
 144 uchar           NetCDPAddr[6] =         /* Ethernet bcast address               */
 145                         { 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc };
 146 #endif
 147 int             NetState;               /* Network loop state                   */
 148 #ifdef CONFIG_NET_MULTI
 149 int             NetRestartWrap = 0;     /* Tried all network devices            */
 150 static int      NetRestarted = 0;       /* Network loop restarted               */
 151 static int      NetDevExists = 0;       /* At least one device configured       */
 152 #endif
 153
 154 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
 155 ushort          NetOurVLAN = 0xFFFF;            /* default is without VLAN      */
 156 ushort          NetOurNativeVLAN = 0xFFFF;      /* ditto                        */
 157
 158 char            BootFile[128];          /* Boot File name                       */
 159
 160 #if defined(CONFIG_CMD_PING)
 161 IPaddr_t        NetPingIP;              /* the ip address to ping               */
 162
 163 static void PingStart(void);
 164 #endif
 165
 166 #if defined(CONFIG_CMD_CDP)
 167 static void CDPStart(void);
 168 #endif
 169
 170 #if defined(CONFIG_CMD_SNTP)
 171 IPaddr_t        NetNtpServerIP;         /* NTP server IP address                */
 172 int             NetTimeOffset=0;        /* offset time from UTC                 */
 173 #endif
 174
 175 #ifdef CONFIG_NETCONSOLE
 176 void NcStart(void);
 177 int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len);
 178 #endif
 179
 180 volatile uchar  PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 181
 182 volatile uchar *NetRxPackets[PKTBUFSRX]; /* Receive packets                     */
 183
 184 static rxhand_f *packetHandler;         /* Current RX packet handler            */
 185 static thand_f *timeHandler;            /* Current timeout handler              */
 186 static ulong    timeStart;              /* Time base value                      */
 187 static ulong    timeDelta;              /* Current timeout value                */
 188 volatile uchar *NetTxPacket = 0;        /* THE transmit packet                  */
 189
 190 static int net_check_prereq (proto_t protocol);
 191
 192 /**********************************************************************/
 193
 194 IPaddr_t        NetArpWaitPacketIP;
 195 IPaddr_t        NetArpWaitReplyIP;
 196 uchar          *NetArpWaitPacketMAC;    /* MAC address of waiting packet's destination  */
 197 uchar          *NetArpWaitTxPacket;     /* THE transmit packet                  */
 198 int             NetArpWaitTxPacketSize;
 199 uchar           NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
 200 ulong           NetArpWaitTimerStart;
 201 int             NetArpWaitTry;
 202
 203 void ArpRequest (void)
 204 {
 205         int i;
 206         volatile uchar *pkt;
 207         ARP_t *arp;
 208
 209 #ifdef ET_DEBUG
 210         printf ("ARP broadcast %d\n", NetArpWaitTry);
 211 #endif
 212         pkt = NetTxPacket;
 213
 214         pkt += NetSetEther (pkt, NetBcastAddr, PROT_ARP);
 215
 216         arp = (ARP_t *) pkt;
 217
 218         arp->ar_hrd = htons (ARP_ETHER);
 219         arp->ar_pro = htons (PROT_IP);
 220         arp->ar_hln = 6;
 221         arp->ar_pln = 4;
 222         arp->ar_op = htons (ARPOP_REQUEST);
 223
 224         memcpy (&arp->ar_data[0], NetOurEther, 6);              /* source ET addr       */
 225         NetWriteIP ((uchar *) & arp->ar_data[6], NetOurIP);     /* source IP addr       */
 226         for (i = 10; i < 16; ++i) {
 227                 arp->ar_data[i] = 0;                            /* dest ET addr = 0     */
 228         }
 229
 230         if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
 231             (NetOurIP & NetOurSubnetMask)) {
 232                 if (NetOurGatewayIP == 0) {
 233                         puts ("## Warning: gatewayip needed but not set\n");
 234                         NetArpWaitReplyIP = NetArpWaitPacketIP;
 235                 } else {
 236                         NetArpWaitReplyIP = NetOurGatewayIP;
 237                 }
 238         } else {
 239                 NetArpWaitReplyIP = NetArpWaitPacketIP;
 240         }
 241
 242         NetWriteIP ((uchar *) & arp->ar_data[16], NetArpWaitReplyIP);
 243         (void) eth_send (NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
 244 }
 245
 246 void ArpTimeoutCheck(void)
 247 {
 248         ulong t;
 249
 250         if (!NetArpWaitPacketIP)
 251                 return;
 252
 253         t = get_timer(0);
 254
 255         /* check for arp timeout */
 256         if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT * CFG_HZ) {
 257                 NetArpWaitTry++;
 258
 259                 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
 260                         puts ("\nARP Retry count exceeded; starting again\n");
 261                         NetArpWaitTry = 0;
 262                         NetStartAgain();
 263                 } else {
 264                         NetArpWaitTimerStart = t;
 265                         ArpRequest();
 266                 }
 267         }
 268 }
 269
 270 /**********************************************************************/
 271 /*
 272  *      Main network processing loop.
 273  */
 274
 275 int
 276 NetLoop(proto_t protocol)
 277 {
 278         bd_t *bd = gd->bd;
 279
 280 #ifdef CONFIG_NET_MULTI
 281         NetRestarted = 0;
 282         NetDevExists = 0;
 283 #endif
 284
 285         /* XXX problem with bss workaround */
 286         NetArpWaitPacketMAC = NULL;
 287         NetArpWaitTxPacket = NULL;
 288         NetArpWaitPacketIP = 0;
 289         NetArpWaitReplyIP = 0;
 290         NetArpWaitTxPacket = NULL;
 291         NetTxPacket = NULL;
 292
 293         if (!NetTxPacket) {
 294                 int     i;
 295                 /*
 296                  *      Setup packet buffers, aligned correctly.
 297                  */
 298                 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
 299                 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
 300                 for (i = 0; i < PKTBUFSRX; i++) {
 301                         NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
 302                 }
 303         }
 304
 305         if (!NetArpWaitTxPacket) {
 306                 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
 307                 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
 308                 NetArpWaitTxPacketSize = 0;
 309         }
 310
 311         eth_halt();
 312 #ifdef CONFIG_NET_MULTI
 313         eth_set_current();
 314 #endif
 315         if (eth_init(bd) < 0) {
 316                 eth_halt();
 317                 return(-1);
 318         }
 319
 320 restart:
 321 #ifdef CONFIG_NET_MULTI
 322         memcpy (NetOurEther, eth_get_dev()->enetaddr, 6);
 323 #else
 324         memcpy (NetOurEther, bd->bi_enetaddr, 6);
 325 #endif
 326
 327         NetState = NETLOOP_CONTINUE;
 328
 329         /*
 330          *      Start the ball rolling with the given start function.  From
 331          *      here on, this code is a state machine driven by received
 332          *      packets and timer events.
 333          */
 334
 335         switch (protocol) {
 336 #if defined(CONFIG_CMD_NFS)
 337         case NFS:
 338 #endif
 339 #if defined(CONFIG_CMD_PING)
 340         case PING:
 341 #endif
 342 #if defined(CONFIG_CMD_SNTP)
 343         case SNTP:
 344 #endif
 345         case NETCONS:
 346         case TFTP:
 347                 NetCopyIP(&NetOurIP, &bd->bi_ip_addr);
 348                 NetOurGatewayIP = getenv_IPaddr ("gatewayip");
 349                 NetOurSubnetMask= getenv_IPaddr ("netmask");
 350                 NetOurVLAN = getenv_VLAN("vlan");
 351                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 352
 353                 switch (protocol) {
 354 #if defined(CONFIG_CMD_NFS)
 355                 case NFS:
 356 #endif
 357                 case NETCONS:
 358                 case TFTP:
 359                         NetServerIP = getenv_IPaddr ("serverip");
 360                         break;
 361 #if defined(CONFIG_CMD_PING)
 362                 case PING:
 363                         /* nothing */
 364                         break;
 365 #endif
 366 #if defined(CONFIG_CMD_SNTP)
 367                 case SNTP:
 368                         /* nothing */
 369                         break;
 370 #endif
 371                 default:
 372                         break;
 373                 }
 374
 375                 break;
 376         case BOOTP:
 377         case RARP:
 378                 /*
 379                  * initialize our IP addr to 0 in order to accept ANY
 380                  * IP addr assigned to us by the BOOTP / RARP server
 381                  */
 382                 NetOurIP = 0;
 383                 NetServerIP = getenv_IPaddr ("serverip");
 384                 NetOurVLAN = getenv_VLAN("vlan");       /* VLANs must be read */
 385                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 386         case CDP:
 387                 NetOurVLAN = getenv_VLAN("vlan");       /* VLANs must be read */
 388                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 389                 break;
 390         default:
 391                 break;
 392         }
 393
 394         switch (net_check_prereq (protocol)) {
 395         case 1:
 396                 /* network not configured */
 397                 eth_halt();
 398                 return (-1);
 399
 400 #ifdef CONFIG_NET_MULTI
 401         case 2:
 402                 /* network device not configured */
 403                 break;
 404 #endif /* CONFIG_NET_MULTI */
 405
 406         case 0:
 407 #ifdef CONFIG_NET_MULTI
 408                 NetDevExists = 1;
 409 #endif
 410                 switch (protocol) {
 411                 case TFTP:
 412                         /* always use ARP to get server ethernet address */
 413                         TftpStart();
 414                         break;
 415
 416 #if defined(CONFIG_CMD_DHCP)
 417                 case DHCP:
 418                         /* Start with a clean slate... */
 419                         BootpTry = 0;
 420                         NetOurIP = 0;
 421                         NetServerIP = getenv_IPaddr ("serverip");
 422                         DhcpRequest();          /* Basically same as BOOTP */
 423                         break;
 424 #endif
 425
 426                 case BOOTP:
 427                         BootpTry = 0;
 428                         BootpRequest ();
 429                         break;
 430
 431                 case RARP:
 432                         RarpTry = 0;
 433                         RarpRequest ();
 434                         break;
 435 #if defined(CONFIG_CMD_PING)
 436                 case PING:
 437                         PingStart();
 438                         break;
 439 #endif
 440 #if defined(CONFIG_CMD_NFS)
 441                 case NFS:
 442                         NfsStart();
 443                         break;
 444 #endif
 445 #if defined(CONFIG_CMD_CDP)
 446                 case CDP:
 447                         CDPStart();
 448                         break;
 449 #endif
 450 #ifdef CONFIG_NETCONSOLE
 451                 case NETCONS:
 452                         NcStart();
 453                         break;
 454 #endif
 455 #if defined(CONFIG_CMD_SNTP)
 456                 case SNTP:
 457                         SntpStart();
 458                         break;
 459 #endif
 460                 default:
 461                         break;
 462                 }
 463
 464                 NetBootFileXferSize = 0;
 465                 break;
 466         }
 467
 468 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 469 #if defined(CFG_FAULT_ECHO_LINK_DOWN) && defined(CONFIG_STATUS_LED) && defined(STATUS_LED_RED)
 470         /*
 471          * Echo the inverted link state to the fault LED.
 472          */
 473         if(miiphy_link(eth_get_dev()->name, CFG_FAULT_MII_ADDR)) {
 474                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 475         } else {
 476                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 477         }
 478 #endif /* CFG_FAULT_ECHO_LINK_DOWN, ... */
 479 #endif /* CONFIG_MII, ... */
 480
 481         /*
 482          *      Main packet reception loop.  Loop receiving packets until
 483          *      someone sets `NetState' to a state that terminates.
 484          */
 485         for (;;) {
 486                 WATCHDOG_RESET();
 487 #ifdef CONFIG_SHOW_ACTIVITY
 488                 {
 489                         extern void show_activity(int arg);
 490                         show_activity(1);
 491                 }
 492 #endif
 493                 /*
 494                  *      Check the ethernet for a new packet.  The ethernet
 495                  *      receive routine will process it.
 496                  */
 497                         eth_rx();
 498
 499                 /*
 500                  *      Abort if ctrl-c was pressed.
 501                  */
 502                 if (ctrlc()) {
 503                         eth_halt();
 504                         puts ("\nAbort\n");
 505                         return (-1);
 506                 }
 507
 508                 ArpTimeoutCheck();
 509
 510                 /*
 511                  *      Check for a timeout, and run the timeout handler
 512                  *      if we have one.
 513                  */
 514                 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
 515                         thand_f *x;
 516
 517 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 518 #  if defined(CFG_FAULT_ECHO_LINK_DOWN) && \
 519       defined(CONFIG_STATUS_LED) &&        \
 520       defined(STATUS_LED_RED)
 521                         /*
 522                          * Echo the inverted link state to the fault LED.
 523                          */
 524                         if(miiphy_link(eth_get_dev()->name, CFG_FAULT_MII_ADDR)) {
 525                                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 526                         } else {
 527                                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 528                         }
 529 #  endif /* CFG_FAULT_ECHO_LINK_DOWN, ... */
 530 #endif /* CONFIG_MII, ... */
 531                         x = timeHandler;
 532                         timeHandler = (thand_f *)0;
 533                         (*x)();
 534                 }
 535
 536
 537                 switch (NetState) {
 538
 539                 case NETLOOP_RESTART:
 540 #ifdef CONFIG_NET_MULTI
 541                         NetRestarted = 1;
 542 #endif
 543                         goto restart;
 544
 545                 case NETLOOP_SUCCESS:
 546                         if (NetBootFileXferSize > 0) {
 547                                 char buf[20];
 548                                 printf("Bytes transferred = %ld (%lx hex)\n",
 549                                         NetBootFileXferSize,
 550                                         NetBootFileXferSize);
 551                                 sprintf(buf, "%lX", NetBootFileXferSize);
 552                                 setenv("filesize", buf);
 553
 554                                 sprintf(buf, "%lX", (unsigned long)load_addr);
 555                                 setenv("fileaddr", buf);
 556                         }
 557                         eth_halt();
 558                         return NetBootFileXferSize;
 559
 560                 case NETLOOP_FAIL:
 561                         return (-1);
 562                 }
 563         }
 564 }
 565
 566 /**********************************************************************/
 567
 568 static void
 569 startAgainTimeout(void)
 570 {
 571         NetState = NETLOOP_RESTART;
 572 }
 573
 574 static void
 575 startAgainHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
 576 {
 577         /* Totally ignore the packet */
 578 }
 579
 580 void NetStartAgain (void)
 581 {
 582         char *nretry;
 583         int noretry = 0, once = 0;
 584
 585         if ((nretry = getenv ("netretry")) != NULL) {
 586                 noretry = (strcmp (nretry, "no") == 0);
 587                 once = (strcmp (nretry, "once") == 0);
 588         }
 589         if (noretry) {
 590                 eth_halt ();
 591                 NetState = NETLOOP_FAIL;
 592                 return;
 593         }
 594 #ifndef CONFIG_NET_MULTI
 595         NetSetTimeout (10UL * CFG_HZ, startAgainTimeout);
 596         NetSetHandler (startAgainHandler);
 597 #else   /* !CONFIG_NET_MULTI*/
 598         eth_halt ();
 599         eth_try_another (!NetRestarted);
 600         eth_init (gd->bd);
 601         if (NetRestartWrap) {
 602                 NetRestartWrap = 0;
 603                 if (NetDevExists && !once) {
 604                         NetSetTimeout (10UL * CFG_HZ, startAgainTimeout);
 605                         NetSetHandler (startAgainHandler);
 606                 } else {
 607                         NetState = NETLOOP_FAIL;
 608                 }
 609         } else {
 610                 NetState = NETLOOP_RESTART;
 611         }
 612 #endif  /* CONFIG_NET_MULTI */
 613 }
 614
 615 /**********************************************************************/
 616 /*
 617  *      Miscelaneous bits.
 618  */
 619
 620 void
 621 NetSetHandler(rxhand_f * f)
 622 {
 623         packetHandler = f;
 624 }
 625
 626
 627 void
 628 NetSetTimeout(ulong iv, thand_f * f)
 629 {
 630         if (iv == 0) {
 631                 timeHandler = (thand_f *)0;
 632         } else {
 633                 timeHandler = f;
 634                 timeStart = get_timer(0);
 635                 timeDelta = iv;
 636         }
 637 }
 638
 639
 640 void
 641 NetSendPacket(volatile uchar * pkt, int len)
 642 {
 643         (void) eth_send(pkt, len);
 644 }
 645
 646 int
 647 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
 648 {
 649         uchar *pkt;
 650
 651         /* convert to new style broadcast */
 652         if (dest == 0)
 653                 dest = 0xFFFFFFFF;
 654
 655         /* if broadcast, make the ether address a broadcast and don't do ARP */
 656         if (dest == 0xFFFFFFFF)
 657                 ether = NetBcastAddr;
 658
 659         /* if MAC address was not discovered yet, save the packet and do an ARP request */
 660         if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
 661
 662 #ifdef ET_DEBUG
 663                 printf("sending ARP for %08lx\n", dest);
 664 #endif
 665                 NetArpWaitPacketIP = dest;
 666                 NetArpWaitPacketMAC = ether;
 667
 668                 pkt = NetArpWaitTxPacket;
 669                 pkt += NetSetEther (pkt, NetArpWaitPacketMAC, PROT_IP);
 670
 671                 NetSetIP (pkt, dest, dport, sport, len);
 672                 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len);
 673
 674                 /* size of the waiting packet */
 675                 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE + len;
 676
 677                 /* and do the ARP request */
 678                 NetArpWaitTry = 1;
 679                 NetArpWaitTimerStart = get_timer(0);
 680                 ArpRequest();
 681                 return 1;       /* waiting */
 682         }
 683
 684 #ifdef ET_DEBUG
 685         printf("sending UDP to %08lx/%02x:%02x:%02x:%02x:%02x:%02x\n",
 686                 dest, ether[0], ether[1], ether[2], ether[3], ether[4], ether[5]);
 687 #endif
 688
 689         pkt = (uchar *)NetTxPacket;
 690         pkt += NetSetEther (pkt, ether, PROT_IP);
 691         NetSetIP (pkt, dest, dport, sport, len);
 692         (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len);
 693
 694         return 0;       /* transmitted */
 695 }
 696
 697 #if defined(CONFIG_CMD_PING)
 698 static ushort PingSeqNo;
 699
 700 int PingSend(void)
 701 {
 702         static uchar mac[6];
 703         volatile IP_t *ip;
 704         volatile ushort *s;
 705         uchar *pkt;
 706
 707         /* XXX always send arp request */
 708
 709         memcpy(mac, NetEtherNullAddr, 6);
 710
 711 #ifdef ET_DEBUG
 712         printf("sending ARP for %08lx\n", NetPingIP);
 713 #endif
 714
 715         NetArpWaitPacketIP = NetPingIP;
 716         NetArpWaitPacketMAC = mac;
 717
 718         pkt = NetArpWaitTxPacket;
 719         pkt += NetSetEther(pkt, mac, PROT_IP);
 720
 721         ip = (volatile IP_t *)pkt;
 722
 723         /*
 724          *      Construct an IP and ICMP header.  (need to set no fragment bit - XXX)
 725          */
 726         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
 727         ip->ip_tos   = 0;
 728         ip->ip_len   = htons(IP_HDR_SIZE_NO_UDP + 8);
 729         ip->ip_id    = htons(NetIPID++);
 730         ip->ip_off   = htons(0x4000);   /* No fragmentation */
 731         ip->ip_ttl   = 255;
 732         ip->ip_p     = 0x01;            /* ICMP */
 733         ip->ip_sum   = 0;
 734         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
 735         NetCopyIP((void*)&ip->ip_dst, &NetPingIP);         /* - "" - */
 736         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
 737
 738         s = &ip->udp_src;               /* XXX ICMP starts here */
 739         s[0] = htons(0x0800);           /* echo-request, code */
 740         s[1] = 0;                       /* checksum */
 741         s[2] = 0;                       /* identifier */
 742         s[3] = htons(PingSeqNo++);      /* sequence number */
 743         s[1] = ~NetCksum((uchar *)s, 8/2);
 744
 745         /* size of the waiting packet */
 746         NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8;
 747
 748         /* and do the ARP request */
 749         NetArpWaitTry = 1;
 750         NetArpWaitTimerStart = get_timer(0);
 751         ArpRequest();
 752         return 1;       /* waiting */
 753 }
 754
 755 static void
 756 PingTimeout (void)
 757 {
 758         eth_halt();
 759         NetState = NETLOOP_FAIL;        /* we did not get the reply */
 760 }
 761
 762 static void
 763 PingHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
 764 {
 765         IPaddr_t tmp;
 766         volatile IP_t *ip = (volatile IP_t *)pkt;
 767
 768         tmp = NetReadIP((void *)&ip->ip_src);
 769         if (tmp != NetPingIP)
 770                 return;
 771
 772         NetState = NETLOOP_SUCCESS;
 773 }
 774
 775 static void PingStart(void)
 776 {
 777 #if defined(CONFIG_NET_MULTI)
 778         printf ("Using %s device\n", eth_get_name());
 779 #endif  /* CONFIG_NET_MULTI */
 780         NetSetTimeout (10UL * CFG_HZ, PingTimeout);
 781         NetSetHandler (PingHandler);
 782
 783         PingSend();
 784 }
 785 #endif
 786
 787 #if defined(CONFIG_CMD_CDP)
 788
 789 #define CDP_DEVICE_ID_TLV               0x0001
 790 #define CDP_ADDRESS_TLV                 0x0002
 791 #define CDP_PORT_ID_TLV                 0x0003
 792 #define CDP_CAPABILITIES_TLV            0x0004
 793 #define CDP_VERSION_TLV                 0x0005
 794 #define CDP_PLATFORM_TLV                0x0006
 795 #define CDP_NATIVE_VLAN_TLV             0x000a
 796 #define CDP_APPLIANCE_VLAN_TLV          0x000e
 797 #define CDP_TRIGGER_TLV                 0x000f
 798 #define CDP_POWER_CONSUMPTION_TLV       0x0010
 799 #define CDP_SYSNAME_TLV                 0x0014
 800 #define CDP_SYSOBJECT_TLV               0x0015
 801 #define CDP_MANAGEMENT_ADDRESS_TLV      0x0016
 802
 803 #define CDP_TIMEOUT                     (CFG_HZ/4)      /* one packet every 250ms */
 804
 805 static int CDPSeq;
 806 static int CDPOK;
 807
 808 ushort CDPNativeVLAN;
 809 ushort CDPApplianceVLAN;
 810
 811 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 0x00 };
 812
 813 static ushort CDP_compute_csum(const uchar *buff, ushort len)
 814 {
 815         ushort csum;
 816         int     odd;
 817         ulong   result = 0;
 818         ushort  leftover;
 819         ushort *p;
 820
 821         if (len > 0) {
 822                 odd = 1 & (ulong)buff;
 823                 if (odd) {
 824                         result = *buff << 8;
 825                         len--;
 826                         buff++;
 827                 }
 828                 while (len > 1) {
 829                         p = (ushort *)buff;
 830                         result += *p++;
 831                         buff = (uchar *)p;
 832                         if (result & 0x80000000)
 833                                 result = (result & 0xFFFF) + (result >> 16);
 834                         len -= 2;
 835                 }
 836                 if (len) {
 837                         leftover = (signed short)(*(const signed char *)buff);
 838                         /* CISCO SUCKS big time! (and blows too):
 839                          * CDP uses the IP checksum algorithm with a twist;
 840                          * for the last byte it *sign* extends and sums.
 841                          */
 842                         result = (result & 0xffff0000) | ((result + leftover) & 0x0000ffff);
 843                 }
 844                 while (result >> 16)
 845                         result = (result & 0xFFFF) + (result >> 16);
 846
 847                 if (odd)
 848                         result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
 849         }
 850
 851         /* add up 16-bit and 17-bit words for 17+c bits */
 852         result = (result & 0xffff) + (result >> 16);
 853         /* add up 16-bit and 2-bit for 16+c bit */
 854         result = (result & 0xffff) + (result >> 16);
 855         /* add up carry.. */
 856         result = (result & 0xffff) + (result >> 16);
 857
 858         /* negate */
 859         csum = ~(ushort)result;
 860
 861         /* run time endian detection */
 862         if (csum != htons(csum))        /* little endian */
 863                 csum = htons(csum);
 864
 865         return csum;
 866 }
 867
 868 int CDPSendTrigger(void)
 869 {
 870         volatile uchar *pkt;
 871         volatile ushort *s;
 872         volatile ushort *cp;
 873         Ethernet_t *et;
 874         int len;
 875         ushort chksum;
 876 #if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID)   || \
 877     defined(CONFIG_CDP_VERSION)   || defined(CONFIG_CDP_PLATFORM)
 878         char buf[32];
 879 #endif
 880
 881         pkt = NetTxPacket;
 882         et = (Ethernet_t *)pkt;
 883
 884         /* NOTE: trigger sent not on any VLAN */
 885
 886         /* form ethernet header */
 887         memcpy(et->et_dest, NetCDPAddr, 6);
 888         memcpy(et->et_src, NetOurEther, 6);
 889
 890         pkt += ETHER_HDR_SIZE;
 891
 892         /* SNAP header */
 893         memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr));
 894         pkt += sizeof(CDP_SNAP_hdr);
 895
 896         /* CDP header */
 897         *pkt++ = 0x02;                          /* CDP version 2 */
 898         *pkt++ = 180;                           /* TTL */
 899         s = (volatile ushort *)pkt;
 900         cp = s;
 901         *s++ = htons(0);                        /* checksum (0 for later calculation) */
 902
 903         /* CDP fields */
 904 #ifdef CONFIG_CDP_DEVICE_ID
 905         *s++ = htons(CDP_DEVICE_ID_TLV);
 906         *s++ = htons(CONFIG_CDP_DEVICE_ID);
 907         memset(buf, 0, sizeof(buf));
 908         sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%02X%02X%02X%02X%02X%02X",
 909                 NetOurEther[0] & 0xff, NetOurEther[1] & 0xff,
 910                 NetOurEther[2] & 0xff, NetOurEther[3] & 0xff,
 911                 NetOurEther[4] & 0xff, NetOurEther[5] & 0xff);
 912         memcpy((uchar *)s, buf, 16);
 913         s += 16 / 2;
 914 #endif
 915
 916 #ifdef CONFIG_CDP_PORT_ID
 917         *s++ = htons(CDP_PORT_ID_TLV);
 918         memset(buf, 0, sizeof(buf));
 919         sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index());
 920         len = strlen(buf);
 921         if (len & 1)    /* make it even */
 922                 len++;
 923         *s++ = htons(len + 4);
 924         memcpy((uchar *)s, buf, len);
 925         s += len / 2;
 926 #endif
 927
 928 #ifdef CONFIG_CDP_CAPABILITIES
 929         *s++ = htons(CDP_CAPABILITIES_TLV);
 930         *s++ = htons(8);
 931         *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES);
 932         s += 2;
 933 #endif
 934
 935 #ifdef CONFIG_CDP_VERSION
 936         *s++ = htons(CDP_VERSION_TLV);
 937         memset(buf, 0, sizeof(buf));
 938         strcpy(buf, CONFIG_CDP_VERSION);
 939         len = strlen(buf);
 940         if (len & 1)    /* make it even */
 941                 len++;
 942         *s++ = htons(len + 4);
 943         memcpy((uchar *)s, buf, len);
 944         s += len / 2;
 945 #endif
 946
 947 #ifdef CONFIG_CDP_PLATFORM
 948         *s++ = htons(CDP_PLATFORM_TLV);
 949         memset(buf, 0, sizeof(buf));
 950         strcpy(buf, CONFIG_CDP_PLATFORM);
 951         len = strlen(buf);
 952         if (len & 1)    /* make it even */
 953                 len++;
 954         *s++ = htons(len + 4);
 955         memcpy((uchar *)s, buf, len);
 956         s += len / 2;
 957 #endif
 958
 959 #ifdef CONFIG_CDP_TRIGGER
 960         *s++ = htons(CDP_TRIGGER_TLV);
 961         *s++ = htons(8);
 962         *(ulong *)s = htonl(CONFIG_CDP_TRIGGER);
 963         s += 2;
 964 #endif
 965
 966 #ifdef CONFIG_CDP_POWER_CONSUMPTION
 967         *s++ = htons(CDP_POWER_CONSUMPTION_TLV);
 968         *s++ = htons(6);
 969         *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION);
 970 #endif
 971
 972         /* length of ethernet packet */
 973         len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE);
 974         et->et_protlen = htons(len);
 975
 976         len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr);
 977         chksum = CDP_compute_csum((uchar *)NetTxPacket + len, (uchar *)s - (NetTxPacket + len));
 978         if (chksum == 0)
 979                 chksum = 0xFFFF;
 980         *cp = htons(chksum);
 981
 982         (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket);
 983         return 0;
 984 }
 985
 986 static void
 987 CDPTimeout (void)
 988 {
 989         CDPSeq++;
 990
 991         if (CDPSeq < 3) {
 992                 NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
 993                 CDPSendTrigger();
 994                 return;
 995         }
 996
 997         /* if not OK try again */
 998         if (!CDPOK)
 999                 NetStartAgain();
1000         else
1001                 NetState = NETLOOP_SUCCESS;
1002 }
1003
1004 static void
1005 CDPDummyHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
1006 {
1007         /* nothing */
1008 }
1009
1010 static void
1011 CDPHandler(const uchar * pkt, unsigned len)
1012 {
1013         const uchar *t;
1014         const ushort *ss;
1015         ushort type, tlen;
1016         uchar applid;
1017         ushort vlan, nvlan;
1018
1019         /* minimum size? */
1020         if (len < sizeof(CDP_SNAP_hdr) + 4)
1021                 goto pkt_short;
1022
1023         /* check for valid CDP SNAP header */
1024         if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0)
1025                 return;
1026
1027         pkt += sizeof(CDP_SNAP_hdr);
1028         len -= sizeof(CDP_SNAP_hdr);
1029
1030         /* Version of CDP protocol must be >= 2 and TTL != 0 */
1031         if (pkt[0] < 0x02 || pkt[1] == 0)
1032                 return;
1033
1034         /* if version is greater than 0x02 maybe we'll have a problem; output a warning */
1035         if (pkt[0] != 0x02)
1036                 printf("** WARNING: CDP packet received with a protocol version %d > 2\n",
1037                                 pkt[0] & 0xff);
1038
1039         if (CDP_compute_csum(pkt, len) != 0)
1040                 return;
1041
1042         pkt += 4;
1043         len -= 4;
1044
1045         vlan = htons(-1);
1046         nvlan = htons(-1);
1047         while (len > 0) {
1048                 if (len < 4)
1049                         goto pkt_short;
1050
1051                 ss = (const ushort *)pkt;
1052                 type = ntohs(ss[0]);
1053                 tlen = ntohs(ss[1]);
1054                 if (tlen > len) {
1055                         goto pkt_short;
1056                 }
1057
1058                 pkt += tlen;
1059                 len -= tlen;
1060
1061                 ss += 2;        /* point ss to the data of the TLV */
1062                 tlen -= 4;
1063
1064                 switch (type) {
1065                         case CDP_DEVICE_ID_TLV:
1066                                 break;
1067                         case CDP_ADDRESS_TLV:
1068                                 break;
1069                         case CDP_PORT_ID_TLV:
1070                                 break;
1071                         case CDP_CAPABILITIES_TLV:
1072                                 break;
1073                         case CDP_VERSION_TLV:
1074                                 break;
1075                         case CDP_PLATFORM_TLV:
1076                                 break;
1077                         case CDP_NATIVE_VLAN_TLV:
1078                                 nvlan = *ss;
1079                                 break;
1080                         case CDP_APPLIANCE_VLAN_TLV:
1081                                 t = (const uchar *)ss;
1082                                 while (tlen > 0) {
1083                                         if (tlen < 3)
1084                                                 goto pkt_short;
1085
1086                                         applid = t[0];
1087                                         ss = (const ushort *)(t + 1);
1088
1089 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE
1090                                         if (applid == CONFIG_CDP_APPLIANCE_VLAN_TYPE)
1091                                                 vlan = *ss;
1092 #else
1093                                         vlan = ntohs(*ss);      /* XXX will this work; dunno */
1094 #endif
1095                                         t += 3; tlen -= 3;
1096                                 }
1097                                 break;
1098                         case CDP_TRIGGER_TLV:
1099                                 break;
1100                         case CDP_POWER_CONSUMPTION_TLV:
1101                                 break;
1102                         case CDP_SYSNAME_TLV:
1103                                 break;
1104                         case CDP_SYSOBJECT_TLV:
1105                                 break;
1106                         case CDP_MANAGEMENT_ADDRESS_TLV:
1107                                 break;
1108                 }
1109         }
1110
1111         CDPApplianceVLAN = vlan;
1112         CDPNativeVLAN = nvlan;
1113
1114         CDPOK = 1;
1115         return;
1116
1117  pkt_short:
1118         printf("** CDP packet is too short\n");
1119         return;
1120 }
1121
1122 static void CDPStart(void)
1123 {
1124 #if defined(CONFIG_NET_MULTI)
1125         printf ("Using %s device\n", eth_get_name());
1126 #endif
1127         CDPSeq = 0;
1128         CDPOK = 0;
1129
1130         CDPNativeVLAN = htons(-1);
1131         CDPApplianceVLAN = htons(-1);
1132
1133         NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
1134         NetSetHandler (CDPDummyHandler);
1135
1136         CDPSendTrigger();
1137 }
1138 #endif
1139
1140
1141 void
1142 NetReceive(volatile uchar * inpkt, int len)
1143 {
1144         Ethernet_t *et;
1145         IP_t    *ip;
1146         ARP_t   *arp;
1147         IPaddr_t tmp;
1148         int     x;
1149         uchar *pkt;
1150 #if defined(CONFIG_CMD_CDP)
1151         int iscdp;
1152 #endif
1153         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1154
1155 #ifdef ET_DEBUG
1156         printf("packet received\n");
1157 #endif
1158
1159         NetRxPkt = inpkt;
1160         NetRxPktLen = len;
1161         et = (Ethernet_t *)inpkt;
1162
1163         /* too small packet? */
1164         if (len < ETHER_HDR_SIZE)
1165                 return;
1166
1167 #ifdef CONFIG_API
1168         if (push_packet) {
1169                 (*push_packet)(inpkt, len);
1170                 return;
1171         }
1172 #endif
1173
1174 #if defined(CONFIG_CMD_CDP)
1175         /* keep track if packet is CDP */
1176         iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0;
1177 #endif
1178
1179         myvlanid = ntohs(NetOurVLAN);
1180         if (myvlanid == (ushort)-1)
1181                 myvlanid = VLAN_NONE;
1182         mynvlanid = ntohs(NetOurNativeVLAN);
1183         if (mynvlanid == (ushort)-1)
1184                 mynvlanid = VLAN_NONE;
1185
1186         x = ntohs(et->et_protlen);
1187
1188 #ifdef ET_DEBUG
1189         printf("packet received\n");
1190 #endif
1191
1192         if (x < 1514) {
1193                 /*
1194                  *      Got a 802 packet.  Check the other protocol field.
1195                  */
1196                 x = ntohs(et->et_prot);
1197
1198                 ip = (IP_t *)(inpkt + E802_HDR_SIZE);
1199                 len -= E802_HDR_SIZE;
1200
1201         } else if (x != PROT_VLAN) {    /* normal packet */
1202                 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE);
1203                 len -= ETHER_HDR_SIZE;
1204
1205         } else {                        /* VLAN packet */
1206                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et;
1207
1208 #ifdef ET_DEBUG
1209                 printf("VLAN packet received\n");
1210 #endif
1211                 /* too small packet? */
1212                 if (len < VLAN_ETHER_HDR_SIZE)
1213                         return;
1214
1215                 /* if no VLAN active */
1216                 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
1217 #if defined(CONFIG_CMD_CDP)
1218                                 && iscdp == 0
1219 #endif
1220                                 )
1221                         return;
1222
1223                 cti = ntohs(vet->vet_tag);
1224                 vlanid = cti & VLAN_IDMASK;
1225                 x = ntohs(vet->vet_type);
1226
1227                 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE);
1228                 len -= VLAN_ETHER_HDR_SIZE;
1229         }
1230
1231 #ifdef ET_DEBUG
1232         printf("Receive from protocol 0x%x\n", x);
1233 #endif
1234
1235 #if defined(CONFIG_CMD_CDP)
1236         if (iscdp) {
1237                 CDPHandler((uchar *)ip, len);
1238                 return;
1239         }
1240 #endif
1241
1242         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1243                 if (vlanid == VLAN_NONE)
1244                         vlanid = (mynvlanid & VLAN_IDMASK);
1245                 /* not matched? */
1246                 if (vlanid != (myvlanid & VLAN_IDMASK))
1247                         return;
1248         }
1249
1250         switch (x) {
1251
1252         case PROT_ARP:
1253                 /*
1254                  * We have to deal with two types of ARP packets:
1255                  * - REQUEST packets will be answered by sending  our
1256                  *   IP address - if we know it.
1257                  * - REPLY packates are expected only after we asked
1258                  *   for the TFTP server's or the gateway's ethernet
1259                  *   address; so if we receive such a packet, we set
1260                  *   the server ethernet address
1261                  */
1262 #ifdef ET_DEBUG
1263                 puts ("Got ARP\n");
1264 #endif
1265                 arp = (ARP_t *)ip;
1266                 if (len < ARP_HDR_SIZE) {
1267                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1268                         return;
1269                 }
1270                 if (ntohs(arp->ar_hrd) != ARP_ETHER) {
1271                         return;
1272                 }
1273                 if (ntohs(arp->ar_pro) != PROT_IP) {
1274                         return;
1275                 }
1276                 if (arp->ar_hln != 6) {
1277                         return;
1278                 }
1279                 if (arp->ar_pln != 4) {
1280                         return;
1281                 }
1282
1283                 if (NetOurIP == 0) {
1284                         return;
1285                 }
1286
1287                 if (NetReadIP(&arp->ar_data[16]) != NetOurIP) {
1288                         return;
1289                 }
1290
1291                 switch (ntohs(arp->ar_op)) {
1292                 case ARPOP_REQUEST:             /* reply with our IP address    */
1293 #ifdef ET_DEBUG
1294                         puts ("Got ARP REQUEST, return our IP\n");
1295 #endif
1296                         pkt = (uchar *)et;
1297                         pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
1298                         arp->ar_op = htons(ARPOP_REPLY);
1299                         memcpy   (&arp->ar_data[10], &arp->ar_data[0], 6);
1300                         NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
1301                         memcpy   (&arp->ar_data[ 0], NetOurEther, 6);
1302                         NetCopyIP(&arp->ar_data[ 6], &NetOurIP);
1303                         (void) eth_send((uchar *)et, (pkt - (uchar *)et) + ARP_HDR_SIZE);
1304                         return;
1305
1306                 case ARPOP_REPLY:               /* arp reply */
1307                         /* are we waiting for a reply */
1308                         if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
1309                                 break;
1310 #ifdef ET_DEBUG
1311                         printf("Got ARP REPLY, set server/gtwy eth addr (%02x:%02x:%02x:%02x:%02x:%02x)\n",
1312                                 arp->ar_data[0], arp->ar_data[1],
1313                                 arp->ar_data[2], arp->ar_data[3],
1314                                 arp->ar_data[4], arp->ar_data[5]);
1315 #endif
1316
1317                         tmp = NetReadIP(&arp->ar_data[6]);
1318
1319                         /* matched waiting packet's address */
1320                         if (tmp == NetArpWaitReplyIP) {
1321 #ifdef ET_DEBUG
1322                                 puts ("Got it\n");
1323 #endif
1324                                 /* save address for later use */
1325                                 memcpy(NetArpWaitPacketMAC, &arp->ar_data[0], 6);
1326
1327 #ifdef CONFIG_NETCONSOLE
1328                                 (*packetHandler)(0,0,0,0);
1329 #endif
1330                                 /* modify header, and transmit it */
1331                                 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6);
1332                                 (void) eth_send(NetArpWaitTxPacket, NetArpWaitTxPacketSize);
1333
1334                                 /* no arp request pending now */
1335                                 NetArpWaitPacketIP = 0;
1336                                 NetArpWaitTxPacketSize = 0;
1337                                 NetArpWaitPacketMAC = NULL;
1338
1339                         }
1340                         return;
1341                 default:
1342 #ifdef ET_DEBUG
1343                         printf("Unexpected ARP opcode 0x%x\n", ntohs(arp->ar_op));
1344 #endif
1345                         return;
1346                 }
1347                 break;
1348
1349         case PROT_RARP:
1350 #ifdef ET_DEBUG
1351                 puts ("Got RARP\n");
1352 #endif
1353                 arp = (ARP_t *)ip;
1354                 if (len < ARP_HDR_SIZE) {
1355                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1356                         return;
1357                 }
1358
1359                 if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
1360                         (ntohs(arp->ar_hrd) != ARP_ETHER)   ||
1361                         (ntohs(arp->ar_pro) != PROT_IP)     ||
1362                         (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
1363
1364                         puts ("invalid RARP header\n");
1365                 } else {
1366                         NetCopyIP(&NetOurIP,    &arp->ar_data[16]);
1367                         if (NetServerIP == 0)
1368                                 NetCopyIP(&NetServerIP, &arp->ar_data[ 6]);
1369                         memcpy (NetServerEther, &arp->ar_data[ 0], 6);
1370
1371                         (*packetHandler)(0,0,0,0);
1372                 }
1373                 break;
1374
1375         case PROT_IP:
1376 #ifdef ET_DEBUG
1377                 puts ("Got IP\n");
1378 #endif
1379                 if (len < IP_HDR_SIZE) {
1380                         debug ("len bad %d < %d\n", len, IP_HDR_SIZE);
1381                         return;
1382                 }
1383                 if (len < ntohs(ip->ip_len)) {
1384                         printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
1385                         return;
1386                 }
1387                 len = ntohs(ip->ip_len);
1388 #ifdef ET_DEBUG
1389                 printf("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
1390 #endif
1391                 if ((ip->ip_hl_v & 0xf0) != 0x40) {
1392                         return;
1393                 }
1394                 if (ip->ip_off & htons(0x1fff)) { /* Can't deal w/ fragments */
1395                         return;
1396                 }
1397                 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
1398                         puts ("checksum bad\n");
1399                         return;
1400                 }
1401                 tmp = NetReadIP(&ip->ip_dst);
1402                 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
1403 #ifdef CONFIG_MCAST_TFTP
1404                         if (Mcast_addr != tmp)
1405 #endif
1406                         return;
1407                 }
1408                 /*
1409                  * watch for ICMP host redirects
1410                  *
1411                  * There is no real handler code (yet). We just watch
1412                  * for ICMP host redirect messages. In case anybody
1413                  * sees these messages: please contact me
1414                  * (wd@denx.de), or - even better - send me the
1415                  * necessary fixes :-)
1416                  *
1417                  * Note: in all cases where I have seen this so far
1418                  * it was a problem with the router configuration,
1419                  * for instance when a router was configured in the
1420                  * BOOTP reply, but the TFTP server was on the same
1421                  * subnet. So this is probably a warning that your
1422                  * configuration might be wrong. But I'm not really
1423                  * sure if there aren't any other situations.
1424                  */
1425                 if (ip->ip_p == IPPROTO_ICMP) {
1426                         ICMP_t *icmph = (ICMP_t *)&(ip->udp_src);
1427
1428                         switch (icmph->type) {
1429                         case ICMP_REDIRECT:
1430                                 if (icmph->code != ICMP_REDIR_HOST)
1431                                         return;
1432                                 puts (" ICMP Host Redirect to ");
1433                                 print_IPaddr(icmph->un.gateway);
1434                                 putc(' ');
1435                                 return;
1436 #if defined(CONFIG_CMD_PING)
1437                         case ICMP_ECHO_REPLY:
1438                                 /*
1439                                  *      IP header OK.  Pass the packet to the current handler.
1440                                  */
1441                                 /* XXX point to ip packet */
1442                                 (*packetHandler)((uchar *)ip, 0, 0, 0);
1443                                 return;
1444                         case ICMP_ECHO_REQUEST:
1445 #ifdef ET_DEBUG
1446                                 printf ("Got ICMP ECHO REQUEST, return %d bytes \n",
1447                                         ETHER_HDR_SIZE + len);
1448 #endif
1449                                 memcpy (&et->et_dest[0], &et->et_src[0], 6);
1450                                 memcpy (&et->et_src[ 0], NetOurEther, 6);
1451
1452                                 ip->ip_sum = 0;
1453                                 ip->ip_off = 0;
1454                                 NetCopyIP((void*)&ip->ip_dst, &ip->ip_src);
1455                                 NetCopyIP((void*)&ip->ip_src, &NetOurIP);
1456                                 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP >> 1);
1457
1458                                 icmph->type = ICMP_ECHO_REPLY;
1459                                 icmph->checksum = 0;
1460                                 icmph->checksum = ~NetCksum((uchar *)icmph,
1461                                                 (len - IP_HDR_SIZE_NO_UDP) >> 1);
1462                                 (void) eth_send((uchar *)et, ETHER_HDR_SIZE + len);
1463                                 return;
1464 #endif
1465                         default:
1466                                 return;
1467                         }
1468                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1469                         return;
1470                 }
1471
1472 #ifdef CONFIG_UDP_CHECKSUM
1473                 if (ip->udp_xsum != 0) {
1474                         ulong   xsum;
1475                         ushort *sumptr;
1476                         ushort  sumlen;
1477
1478                         xsum  = ip->ip_p;
1479                         xsum += (ntohs(ip->udp_len));
1480                         xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
1481                         xsum += (ntohl(ip->ip_src) >>  0) & 0x0000ffff;
1482                         xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
1483                         xsum += (ntohl(ip->ip_dst) >>  0) & 0x0000ffff;
1484
1485                         sumlen = ntohs(ip->udp_len);
1486                         sumptr = (ushort *) &(ip->udp_src);
1487
1488                         while (sumlen > 1) {
1489                                 ushort sumdata;
1490
1491                                 sumdata = *sumptr++;
1492                                 xsum += ntohs(sumdata);
1493                                 sumlen -= 2;
1494                         }
1495                         if (sumlen > 0) {
1496                                 ushort sumdata;
1497
1498                                 sumdata = *(unsigned char *) sumptr;
1499                                 sumdata = (sumdata << 8) & 0xff00;
1500                                 xsum += sumdata;
1501                         }
1502                         while ((xsum >> 16) != 0) {
1503                                 xsum = (xsum & 0x0000ffff) + ((xsum >> 16) & 0x0000ffff);
1504                         }
1505                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1506                                 printf(" UDP wrong checksum %08x %08x\n", xsum, ntohs(ip->udp_xsum));
1507                                 return;
1508                         }
1509                 }
1510 #endif
1511
1512
1513 #ifdef CONFIG_NETCONSOLE
1514                 nc_input_packet((uchar *)ip +IP_HDR_SIZE,
1515                                                 ntohs(ip->udp_dst),
1516                                                 ntohs(ip->udp_src),
1517                                                 ntohs(ip->udp_len) - 8);
1518 #endif
1519                 /*
1520                  *      IP header OK.  Pass the packet to the current handler.
1521                  */
1522                 (*packetHandler)((uchar *)ip +IP_HDR_SIZE,
1523                                                 ntohs(ip->udp_dst),
1524                                                 ntohs(ip->udp_src),
1525                                                 ntohs(ip->udp_len) - 8);
1526                 break;
1527         }
1528 }
1529
1530
1531 /**********************************************************************/
1532
1533 static int net_check_prereq (proto_t protocol)
1534 {
1535         switch (protocol) {
1536                 /* Fall through */
1537 #if defined(CONFIG_CMD_PING)
1538         case PING:
1539                 if (NetPingIP == 0) {
1540                         puts ("*** ERROR: ping address not given\n");
1541                         return (1);
1542                 }
1543                 goto common;
1544 #endif
1545 #if defined(CONFIG_CMD_SNTP)
1546         case SNTP:
1547                 if (NetNtpServerIP == 0) {
1548                         puts ("*** ERROR: NTP server address not given\n");
1549                         return (1);
1550                 }
1551                 goto common;
1552 #endif
1553 #if defined(CONFIG_CMD_NFS)
1554         case NFS:
1555 #endif
1556         case NETCONS:
1557         case TFTP:
1558                 if (NetServerIP == 0) {
1559                         puts ("*** ERROR: `serverip' not set\n");
1560                         return (1);
1561                 }
1562 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP)
1563     common:
1564 #endif
1565
1566                 if (NetOurIP == 0) {
1567                         puts ("*** ERROR: `ipaddr' not set\n");
1568                         return (1);
1569                 }
1570                 /* Fall through */
1571
1572         case DHCP:
1573         case RARP:
1574         case BOOTP:
1575         case CDP:
1576                 if (memcmp (NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
1577 #ifdef CONFIG_NET_MULTI
1578                         extern int eth_get_dev_index (void);
1579                         int num = eth_get_dev_index ();
1580
1581                         switch (num) {
1582                         case -1:
1583                                 puts ("*** ERROR: No ethernet found.\n");
1584                                 return (1);
1585                         case 0:
1586                                 puts ("*** ERROR: `ethaddr' not set\n");
1587                                 break;
1588                         default:
1589                                 printf ("*** ERROR: `eth%daddr' not set\n",
1590                                         num);
1591                                 break;
1592                         }
1593
1594                         NetStartAgain ();
1595                         return (2);
1596 #else
1597                         puts ("*** ERROR: `ethaddr' not set\n");
1598                         return (1);
1599 #endif
1600                 }
1601                 /* Fall through */
1602         default:
1603                 return (0);
1604         }
1605         return (0);             /* OK */
1606 }
1607 /**********************************************************************/
1608
1609 int
1610 NetCksumOk(uchar * ptr, int len)
1611 {
1612         return !((NetCksum(ptr, len) + 1) & 0xfffe);
1613 }
1614
1615
1616 unsigned
1617 NetCksum(uchar * ptr, int len)
1618 {
1619         ulong   xsum;
1620         ushort *p = (ushort *)ptr;
1621
1622         xsum = 0;
1623         while (len-- > 0)
1624                 xsum += *p++;
1625         xsum = (xsum & 0xffff) + (xsum >> 16);
1626         xsum = (xsum & 0xffff) + (xsum >> 16);
1627         return (xsum & 0xffff);
1628 }
1629
1630 int
1631 NetEthHdrSize(void)
1632 {
1633         ushort myvlanid;
1634
1635         myvlanid = ntohs(NetOurVLAN);
1636         if (myvlanid == (ushort)-1)
1637                 myvlanid = VLAN_NONE;
1638
1639         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : VLAN_ETHER_HDR_SIZE;
1640 }
1641
1642 int
1643 NetSetEther(volatile uchar * xet, uchar * addr, uint prot)
1644 {
1645         Ethernet_t *et = (Ethernet_t *)xet;
1646         ushort myvlanid;
1647
1648         myvlanid = ntohs(NetOurVLAN);
1649         if (myvlanid == (ushort)-1)
1650                 myvlanid = VLAN_NONE;
1651
1652         memcpy (et->et_dest, addr, 6);
1653         memcpy (et->et_src, NetOurEther, 6);
1654         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1655         et->et_protlen = htons(prot);
1656                 return ETHER_HDR_SIZE;
1657         } else {
1658                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet;
1659
1660                 vet->vet_vlan_type = htons(PROT_VLAN);
1661                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1662                 vet->vet_type = htons(prot);
1663                 return VLAN_ETHER_HDR_SIZE;
1664         }
1665 }
1666
1667 void
1668 NetSetIP(volatile uchar * xip, IPaddr_t dest, int dport, int sport, int len)
1669 {
1670         volatile IP_t *ip = (IP_t *)xip;
1671
1672         /*
1673          *      If the data is an odd number of bytes, zero the
1674          *      byte after the last byte so that the checksum
1675          *      will work.
1676          */
1677         if (len & 1)
1678                 xip[IP_HDR_SIZE + len] = 0;
1679
1680         /*
1681          *      Construct an IP and UDP header.
1682          *      (need to set no fragment bit - XXX)
1683          */
1684         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
1685         ip->ip_tos   = 0;
1686         ip->ip_len   = htons(IP_HDR_SIZE + len);
1687         ip->ip_id    = htons(NetIPID++);
1688         ip->ip_off   = htons(0x4000);   /* No fragmentation */
1689         ip->ip_ttl   = 255;
1690         ip->ip_p     = 17;              /* UDP */
1691         ip->ip_sum   = 0;
1692         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
1693         NetCopyIP((void*)&ip->ip_dst, &dest);      /* - "" - */
1694         ip->udp_src  = htons(sport);
1695         ip->udp_dst  = htons(dport);
1696         ip->udp_len  = htons(8 + len);
1697         ip->udp_xsum = 0;
1698         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
1699 }
1700
1701 void copy_filename (char *dst, char *src, int size)
1702 {
1703         if (*src && (*src == '"')) {
1704                 ++src;
1705                 --size;
1706         }
1707
1708         while ((--size > 0) && *src && (*src != '"')) {
1709                 *dst++ = *src++;
1710         }
1711         *dst = '\0';
1712 }
1713
1714 #endif
1715
1716 void ip_to_string (IPaddr_t x, char *s)
1717 {
1718         x = ntohl (x);
1719         sprintf (s, "%d.%d.%d.%d",
1720                  (int) ((x >> 24) & 0xff),
1721                  (int) ((x >> 16) & 0xff),
1722                  (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
1723         );
1724 }
1725
1726 IPaddr_t string_to_ip(char *s)
1727 {
1728         IPaddr_t addr;
1729         char *e;
1730         int i;
1731
1732         if (s == NULL)
1733                 return(0);
1734
1735         for (addr=0, i=0; i<4; ++i) {
1736                 ulong val = s ? simple_strtoul(s, &e, 10) : 0;
1737                 addr <<= 8;
1738                 addr |= (val & 0xFF);
1739                 if (s) {
1740                         s = (*e) ? e+1 : e;
1741                 }
1742         }
1743
1744         return (htonl(addr));
1745 }
1746
1747 void VLAN_to_string(ushort x, char *s)
1748 {
1749         x = ntohs(x);
1750
1751         if (x == (ushort)-1)
1752                 x = VLAN_NONE;
1753
1754         if (x == VLAN_NONE)
1755                 strcpy(s, "none");
1756         else
1757                 sprintf(s, "%d", x & VLAN_IDMASK);
1758 }
1759
1760 ushort string_to_VLAN(char *s)
1761 {
1762         ushort id;
1763
1764         if (s == NULL)
1765                 return htons(VLAN_NONE);
1766
1767         if (*s < '0' || *s > '9')
1768                 id = VLAN_NONE;
1769         else
1770                 id = (ushort)simple_strtoul(s, NULL, 10);
1771
1772         return htons(id);
1773 }
1774
1775 void print_IPaddr (IPaddr_t x)
1776 {
1777         char tmp[16];
1778
1779         ip_to_string (x, tmp);
1780
1781         puts (tmp);
1782 }
1783
1784 IPaddr_t getenv_IPaddr (char *var)
1785 {
1786         return (string_to_ip(getenv(var)));
1787 }
1788
1789 ushort getenv_VLAN(char *var)
1790 {
1791         return (string_to_VLAN(getenv(var)));
1792 }