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 #if defined(CONFIG_CDP_VERSION)
  93 #include <timestamp.h>
  94 #endif
  95 #if defined(CONFIG_CMD_DNS)
  96 #include "dns.h"
  97 #endif
  98
  99 #if defined(CONFIG_CMD_NET)
 100
 101 DECLARE_GLOBAL_DATA_PTR;
 102
 103 #ifndef CONFIG_ARP_TIMEOUT
 104 # define ARP_TIMEOUT            5000UL  /* Milliseconds before trying ARP again */
 105 #else
 106 # define ARP_TIMEOUT            CONFIG_ARP_TIMEOUT
 107 #endif
 108
 109
 110 #ifndef CONFIG_NET_RETRY_COUNT
 111 # define ARP_TIMEOUT_COUNT      5       /* # of timeouts before giving up  */
 112 #else
 113 # define ARP_TIMEOUT_COUNT      CONFIG_NET_RETRY_COUNT
 114 #endif
 115
 116 #if 0
 117 #define ET_DEBUG
 118 #endif
 119
 120 /** BOOTP EXTENTIONS **/
 121
 122 IPaddr_t        NetOurSubnetMask=0;             /* Our subnet mask (0=unknown)  */
 123 IPaddr_t        NetOurGatewayIP=0;              /* Our gateways IP address      */
 124 IPaddr_t        NetOurDNSIP=0;                  /* Our DNS IP address           */
 125 #if defined(CONFIG_BOOTP_DNS2)
 126 IPaddr_t        NetOurDNS2IP=0;                 /* Our 2nd DNS IP address       */
 127 #endif
 128 char            NetOurNISDomain[32]={0,};       /* Our NIS domain               */
 129 char            NetOurHostName[32]={0,};        /* Our hostname                 */
 130 char            NetOurRootPath[64]={0,};        /* Our bootpath                 */
 131 ushort          NetBootFileSize=0;              /* Our bootfile size in blocks  */
 132
 133 #ifdef CONFIG_MCAST_TFTP        /* Multicast TFTP */
 134 IPaddr_t Mcast_addr;
 135 #endif
 136
 137 /** END OF BOOTP EXTENTIONS **/
 138
 139 ulong           NetBootFileXferSize;    /* The actual transferred size of the bootfile (in bytes) */
 140 uchar           NetOurEther[6];         /* Our ethernet address                 */
 141 uchar           NetServerEther[6] =     /* Boot server enet address             */
 142                         { 0, 0, 0, 0, 0, 0 };
 143 IPaddr_t        NetOurIP;               /* Our IP addr (0 = unknown)            */
 144 IPaddr_t        NetServerIP;            /* Server IP addr (0 = unknown)         */
 145 volatile uchar *NetRxPacket;            /* Current receive packet               */
 146 int             NetRxPacketLen;         /* Current rx packet length             */
 147 unsigned        NetIPID;                /* IP packet ID                         */
 148 uchar           NetBcastAddr[6] =       /* Ethernet bcast address               */
 149                         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 150 uchar           NetEtherNullAddr[6] =
 151                         { 0, 0, 0, 0, 0, 0 };
 152 #ifdef CONFIG_API
 153 void            (*push_packet)(volatile void *, int len) = 0;
 154 #endif
 155 #if defined(CONFIG_CMD_CDP)
 156 uchar           NetCDPAddr[6] =         /* Ethernet bcast address               */
 157                         { 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc };
 158 #endif
 159 int             NetState;               /* Network loop state                   */
 160 #ifdef CONFIG_NET_MULTI
 161 int             NetRestartWrap = 0;     /* Tried all network devices            */
 162 static int      NetRestarted = 0;       /* Network loop restarted               */
 163 static int      NetDevExists = 0;       /* At least one device configured       */
 164 #endif
 165
 166 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
 167 ushort          NetOurVLAN = 0xFFFF;            /* default is without VLAN      */
 168 ushort          NetOurNativeVLAN = 0xFFFF;      /* ditto                        */
 169
 170 char            BootFile[128];          /* Boot File name                       */
 171
 172 #if defined(CONFIG_CMD_PING)
 173 IPaddr_t        NetPingIP;              /* the ip address to ping               */
 174
 175 static void PingStart(void);
 176 #endif
 177
 178 #if defined(CONFIG_CMD_CDP)
 179 static void CDPStart(void);
 180 #endif
 181
 182 #if defined(CONFIG_CMD_SNTP)
 183 IPaddr_t        NetNtpServerIP;         /* NTP server IP address                */
 184 int             NetTimeOffset=0;        /* offset time from UTC                 */
 185 #endif
 186
 187 #ifdef CONFIG_NETCONSOLE
 188 void NcStart(void);
 189 int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len);
 190 #endif
 191
 192 volatile uchar  PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 193
 194 volatile uchar *NetRxPackets[PKTBUFSRX]; /* Receive packets                     */
 195
 196 static rxhand_f *packetHandler;         /* Current RX packet handler            */
 197 static thand_f *timeHandler;            /* Current timeout handler              */
 198 static ulong    timeStart;              /* Time base value                      */
 199 static ulong    timeDelta;              /* Current timeout value                */
 200 volatile uchar *NetTxPacket = 0;        /* THE transmit packet                  */
 201
 202 static int net_check_prereq (proto_t protocol);
 203
 204 /**********************************************************************/
 205
 206 IPaddr_t        NetArpWaitPacketIP;
 207 IPaddr_t        NetArpWaitReplyIP;
 208 uchar          *NetArpWaitPacketMAC;    /* MAC address of waiting packet's destination  */
 209 uchar          *NetArpWaitTxPacket;     /* THE transmit packet                  */
 210 int             NetArpWaitTxPacketSize;
 211 uchar           NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
 212 ulong           NetArpWaitTimerStart;
 213 int             NetArpWaitTry;
 214
 215 void ArpRequest (void)
 216 {
 217         int i;
 218         volatile uchar *pkt;
 219         ARP_t *arp;
 220
 221 #ifdef ET_DEBUG
 222         printf ("ARP broadcast %d\n", NetArpWaitTry);
 223 #endif
 224         pkt = NetTxPacket;
 225
 226         pkt += NetSetEther (pkt, NetBcastAddr, PROT_ARP);
 227
 228         arp = (ARP_t *) pkt;
 229
 230         arp->ar_hrd = htons (ARP_ETHER);
 231         arp->ar_pro = htons (PROT_IP);
 232         arp->ar_hln = 6;
 233         arp->ar_pln = 4;
 234         arp->ar_op = htons (ARPOP_REQUEST);
 235
 236         memcpy (&arp->ar_data[0], NetOurEther, 6);              /* source ET addr       */
 237         NetWriteIP ((uchar *) & arp->ar_data[6], NetOurIP);     /* source IP addr       */
 238         for (i = 10; i < 16; ++i) {
 239                 arp->ar_data[i] = 0;                            /* dest ET addr = 0     */
 240         }
 241
 242         if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
 243             (NetOurIP & NetOurSubnetMask)) {
 244                 if (NetOurGatewayIP == 0) {
 245                         puts ("## Warning: gatewayip needed but not set\n");
 246                         NetArpWaitReplyIP = NetArpWaitPacketIP;
 247                 } else {
 248                         NetArpWaitReplyIP = NetOurGatewayIP;
 249                 }
 250         } else {
 251                 NetArpWaitReplyIP = NetArpWaitPacketIP;
 252         }
 253
 254         NetWriteIP ((uchar *) & arp->ar_data[16], NetArpWaitReplyIP);
 255         (void) eth_send (NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
 256 }
 257
 258 void ArpTimeoutCheck(void)
 259 {
 260         ulong t;
 261
 262         if (!NetArpWaitPacketIP)
 263                 return;
 264
 265         t = get_timer(0);
 266
 267         /* check for arp timeout */
 268         if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT) {
 269                 NetArpWaitTry++;
 270
 271                 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
 272                         puts ("\nARP Retry count exceeded; starting again\n");
 273                         NetArpWaitTry = 0;
 274                         NetStartAgain();
 275                 } else {
 276                         NetArpWaitTimerStart = t;
 277                         ArpRequest();
 278                 }
 279         }
 280 }
 281
 282 static void
 283 NetInitLoop(proto_t protocol)
 284 {
 285         static int env_changed_id = 0;
 286         bd_t *bd = gd->bd;
 287         int env_id = get_env_id ();
 288
 289         /* update only when the environment has changed */
 290         if (env_changed_id != env_id) {
 291                 NetCopyIP(&NetOurIP, &bd->bi_ip_addr);
 292                 NetOurGatewayIP = getenv_IPaddr ("gatewayip");
 293                 NetOurSubnetMask= getenv_IPaddr ("netmask");
 294                 NetServerIP = getenv_IPaddr ("serverip");
 295                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 296                 NetOurVLAN = getenv_VLAN("vlan");
 297 #if defined(CONFIG_CMD_DNS)
 298                 NetOurDNSIP = getenv_IPaddr("dnsip");
 299 #endif
 300                 env_changed_id = env_id;
 301         }
 302
 303         return;
 304 }
 305
 306 /**********************************************************************/
 307 /*
 308  *      Main network processing loop.
 309  */
 310
 311 int
 312 NetLoop(proto_t protocol)
 313 {
 314         bd_t *bd = gd->bd;
 315
 316 #ifdef CONFIG_NET_MULTI
 317         NetRestarted = 0;
 318         NetDevExists = 0;
 319 #endif
 320
 321         /* XXX problem with bss workaround */
 322         NetArpWaitPacketMAC = NULL;
 323         NetArpWaitTxPacket = NULL;
 324         NetArpWaitPacketIP = 0;
 325         NetArpWaitReplyIP = 0;
 326         NetArpWaitTxPacket = NULL;
 327         NetTxPacket = NULL;
 328
 329         if (!NetTxPacket) {
 330                 int     i;
 331                 /*
 332                  *      Setup packet buffers, aligned correctly.
 333                  */
 334                 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
 335                 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
 336                 for (i = 0; i < PKTBUFSRX; i++) {
 337                         NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
 338                 }
 339         }
 340
 341         if (!NetArpWaitTxPacket) {
 342                 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
 343                 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
 344                 NetArpWaitTxPacketSize = 0;
 345         }
 346
 347         eth_halt();
 348 #ifdef CONFIG_NET_MULTI
 349         eth_set_current();
 350 #endif
 351         if (eth_init(bd) < 0) {
 352                 eth_halt();
 353                 return(-1);
 354         }
 355
 356 restart:
 357 #ifdef CONFIG_NET_MULTI
 358         memcpy (NetOurEther, eth_get_dev()->enetaddr, 6);
 359 #else
 360         eth_getenv_enetaddr("ethaddr", NetOurEther);
 361 #endif
 362
 363         NetState = NETLOOP_CONTINUE;
 364
 365         /*
 366          *      Start the ball rolling with the given start function.  From
 367          *      here on, this code is a state machine driven by received
 368          *      packets and timer events.
 369          */
 370         NetInitLoop(protocol);
 371
 372         switch (net_check_prereq (protocol)) {
 373         case 1:
 374                 /* network not configured */
 375                 eth_halt();
 376                 return (-1);
 377
 378 #ifdef CONFIG_NET_MULTI
 379         case 2:
 380                 /* network device not configured */
 381                 break;
 382 #endif /* CONFIG_NET_MULTI */
 383
 384         case 0:
 385 #ifdef CONFIG_NET_MULTI
 386                 NetDevExists = 1;
 387 #endif
 388                 switch (protocol) {
 389                 case TFTP:
 390                         /* always use ARP to get server ethernet address */
 391                         TftpStart();
 392                         break;
 393
 394 #if defined(CONFIG_CMD_DHCP)
 395                 case DHCP:
 396                         BootpTry = 0;
 397                         NetOurIP = 0;
 398                         DhcpRequest();          /* Basically same as BOOTP */
 399                         break;
 400 #endif
 401
 402                 case BOOTP:
 403                         BootpTry = 0;
 404                         NetOurIP = 0;
 405                         BootpRequest ();
 406                         break;
 407
 408                 case RARP:
 409                         RarpTry = 0;
 410                         NetOurIP = 0;
 411                         RarpRequest ();
 412                         break;
 413 #if defined(CONFIG_CMD_PING)
 414                 case PING:
 415                         PingStart();
 416                         break;
 417 #endif
 418 #if defined(CONFIG_CMD_NFS)
 419                 case NFS:
 420                         NfsStart();
 421                         break;
 422 #endif
 423 #if defined(CONFIG_CMD_CDP)
 424                 case CDP:
 425                         CDPStart();
 426                         break;
 427 #endif
 428 #ifdef CONFIG_NETCONSOLE
 429                 case NETCONS:
 430                         NcStart();
 431                         break;
 432 #endif
 433 #if defined(CONFIG_CMD_SNTP)
 434                 case SNTP:
 435                         SntpStart();
 436                         break;
 437 #endif
 438 #if defined(CONFIG_CMD_DNS)
 439                 case DNS:
 440                         DnsStart();
 441                         break;
 442 #endif
 443                 default:
 444                         break;
 445                 }
 446
 447                 NetBootFileXferSize = 0;
 448                 break;
 449         }
 450
 451 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 452 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && defined(CONFIG_STATUS_LED) && defined(STATUS_LED_RED)
 453         /*
 454          * Echo the inverted link state to the fault LED.
 455          */
 456         if(miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) {
 457                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 458         } else {
 459                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 460         }
 461 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 462 #endif /* CONFIG_MII, ... */
 463
 464         /*
 465          *      Main packet reception loop.  Loop receiving packets until
 466          *      someone sets `NetState' to a state that terminates.
 467          */
 468         for (;;) {
 469                 WATCHDOG_RESET();
 470 #ifdef CONFIG_SHOW_ACTIVITY
 471                 {
 472                         extern void show_activity(int arg);
 473                         show_activity(1);
 474                 }
 475 #endif
 476                 /*
 477                  *      Check the ethernet for a new packet.  The ethernet
 478                  *      receive routine will process it.
 479                  */
 480                 eth_rx();
 481
 482                 /*
 483                  *      Abort if ctrl-c was pressed.
 484                  */
 485                 if (ctrlc()) {
 486                         eth_halt();
 487                         puts ("\nAbort\n");
 488                         return (-1);
 489                 }
 490
 491                 ArpTimeoutCheck();
 492
 493                 /*
 494                  *      Check for a timeout, and run the timeout handler
 495                  *      if we have one.
 496                  */
 497                 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
 498                         thand_f *x;
 499
 500 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 501 #  if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \
 502       defined(CONFIG_STATUS_LED) &&        \
 503       defined(STATUS_LED_RED)
 504                         /*
 505                          * Echo the inverted link state to the fault LED.
 506                          */
 507                         if(miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) {
 508                                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 509                         } else {
 510                                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 511                         }
 512 #  endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 513 #endif /* CONFIG_MII, ... */
 514                         x = timeHandler;
 515                         timeHandler = (thand_f *)0;
 516                         (*x)();
 517                 }
 518
 519
 520                 switch (NetState) {
 521
 522                 case NETLOOP_RESTART:
 523 #ifdef CONFIG_NET_MULTI
 524                         NetRestarted = 1;
 525 #endif
 526                         goto restart;
 527
 528                 case NETLOOP_SUCCESS:
 529                         if (NetBootFileXferSize > 0) {
 530                                 char buf[20];
 531                                 printf("Bytes transferred = %ld (%lx hex)\n",
 532                                         NetBootFileXferSize,
 533                                         NetBootFileXferSize);
 534                                 sprintf(buf, "%lX", NetBootFileXferSize);
 535                                 setenv("filesize", buf);
 536
 537                                 sprintf(buf, "%lX", (unsigned long)load_addr);
 538                                 setenv("fileaddr", buf);
 539                         }
 540                         eth_halt();
 541                         return NetBootFileXferSize;
 542
 543                 case NETLOOP_FAIL:
 544                         return (-1);
 545                 }
 546         }
 547 }
 548
 549 /**********************************************************************/
 550
 551 static void
 552 startAgainTimeout(void)
 553 {
 554         NetState = NETLOOP_RESTART;
 555 }
 556
 557 static void
 558 startAgainHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
 559 {
 560         /* Totally ignore the packet */
 561 }
 562
 563 void NetStartAgain (void)
 564 {
 565         char *nretry;
 566         int noretry = 0, once = 0;
 567
 568         if ((nretry = getenv ("netretry")) != NULL) {
 569                 noretry = (strcmp (nretry, "no") == 0);
 570                 once = (strcmp (nretry, "once") == 0);
 571         }
 572         if (noretry) {
 573                 eth_halt ();
 574                 NetState = NETLOOP_FAIL;
 575                 return;
 576         }
 577 #ifndef CONFIG_NET_MULTI
 578         NetSetTimeout (10000UL, startAgainTimeout);
 579         NetSetHandler (startAgainHandler);
 580 #else   /* !CONFIG_NET_MULTI*/
 581         eth_halt ();
 582 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
 583         eth_try_another (!NetRestarted);
 584 #endif
 585         eth_init (gd->bd);
 586         if (NetRestartWrap) {
 587                 NetRestartWrap = 0;
 588                 if (NetDevExists && !once) {
 589                         NetSetTimeout (10000UL, startAgainTimeout);
 590                         NetSetHandler (startAgainHandler);
 591                 } else {
 592                         NetState = NETLOOP_FAIL;
 593                 }
 594         } else {
 595                 NetState = NETLOOP_RESTART;
 596         }
 597 #endif  /* CONFIG_NET_MULTI */
 598 }
 599
 600 /**********************************************************************/
 601 /*
 602  *      Miscelaneous bits.
 603  */
 604
 605 void
 606 NetSetHandler(rxhand_f * f)
 607 {
 608         packetHandler = f;
 609 }
 610
 611
 612 void
 613 NetSetTimeout(ulong iv, thand_f * f)
 614 {
 615         if (iv == 0) {
 616                 timeHandler = (thand_f *)0;
 617         } else {
 618                 timeHandler = f;
 619                 timeStart = get_timer(0);
 620                 timeDelta = iv;
 621         }
 622 }
 623
 624
 625 void
 626 NetSendPacket(volatile uchar * pkt, int len)
 627 {
 628         (void) eth_send(pkt, len);
 629 }
 630
 631 int
 632 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
 633 {
 634         uchar *pkt;
 635
 636         /* convert to new style broadcast */
 637         if (dest == 0)
 638                 dest = 0xFFFFFFFF;
 639
 640         /* if broadcast, make the ether address a broadcast and don't do ARP */
 641         if (dest == 0xFFFFFFFF)
 642                 ether = NetBcastAddr;
 643
 644         /* if MAC address was not discovered yet, save the packet and do an ARP request */
 645         if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
 646
 647 #ifdef ET_DEBUG
 648                 printf("sending ARP for %08lx\n", dest);
 649 #endif
 650                 NetArpWaitPacketIP = dest;
 651                 NetArpWaitPacketMAC = ether;
 652
 653                 pkt = NetArpWaitTxPacket;
 654                 pkt += NetSetEther (pkt, NetArpWaitPacketMAC, PROT_IP);
 655
 656                 NetSetIP (pkt, dest, dport, sport, len);
 657                 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len);
 658
 659                 /* size of the waiting packet */
 660                 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE + len;
 661
 662                 /* and do the ARP request */
 663                 NetArpWaitTry = 1;
 664                 NetArpWaitTimerStart = get_timer(0);
 665                 ArpRequest();
 666                 return 1;       /* waiting */
 667         }
 668
 669 #ifdef ET_DEBUG
 670         printf("sending UDP to %08lx/%pM\n", dest, ether);
 671 #endif
 672
 673         pkt = (uchar *)NetTxPacket;
 674         pkt += NetSetEther (pkt, ether, PROT_IP);
 675         NetSetIP (pkt, dest, dport, sport, len);
 676         (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len);
 677
 678         return 0;       /* transmitted */
 679 }
 680
 681 #if defined(CONFIG_CMD_PING)
 682 static ushort PingSeqNo;
 683
 684 int PingSend(void)
 685 {
 686         static uchar mac[6];
 687         volatile IP_t *ip;
 688         volatile ushort *s;
 689         uchar *pkt;
 690
 691         /* XXX always send arp request */
 692
 693         memcpy(mac, NetEtherNullAddr, 6);
 694
 695 #ifdef ET_DEBUG
 696         printf("sending ARP for %08lx\n", NetPingIP);
 697 #endif
 698
 699         NetArpWaitPacketIP = NetPingIP;
 700         NetArpWaitPacketMAC = mac;
 701
 702         pkt = NetArpWaitTxPacket;
 703         pkt += NetSetEther(pkt, mac, PROT_IP);
 704
 705         ip = (volatile IP_t *)pkt;
 706
 707         /*
 708          *      Construct an IP and ICMP header.  (need to set no fragment bit - XXX)
 709          */
 710         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
 711         ip->ip_tos   = 0;
 712         ip->ip_len   = htons(IP_HDR_SIZE_NO_UDP + 8);
 713         ip->ip_id    = htons(NetIPID++);
 714         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
 715         ip->ip_ttl   = 255;
 716         ip->ip_p     = 0x01;            /* ICMP */
 717         ip->ip_sum   = 0;
 718         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
 719         NetCopyIP((void*)&ip->ip_dst, &NetPingIP);         /* - "" - */
 720         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
 721
 722         s = &ip->udp_src;               /* XXX ICMP starts here */
 723         s[0] = htons(0x0800);           /* echo-request, code */
 724         s[1] = 0;                       /* checksum */
 725         s[2] = 0;                       /* identifier */
 726         s[3] = htons(PingSeqNo++);      /* sequence number */
 727         s[1] = ~NetCksum((uchar *)s, 8/2);
 728
 729         /* size of the waiting packet */
 730         NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8;
 731
 732         /* and do the ARP request */
 733         NetArpWaitTry = 1;
 734         NetArpWaitTimerStart = get_timer(0);
 735         ArpRequest();
 736         return 1;       /* waiting */
 737 }
 738
 739 static void
 740 PingTimeout (void)
 741 {
 742         eth_halt();
 743         NetState = NETLOOP_FAIL;        /* we did not get the reply */
 744 }
 745
 746 static void
 747 PingHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
 748 {
 749         IPaddr_t tmp;
 750         volatile IP_t *ip = (volatile IP_t *)pkt;
 751
 752         tmp = NetReadIP((void *)&ip->ip_src);
 753         if (tmp != NetPingIP)
 754                 return;
 755
 756         NetState = NETLOOP_SUCCESS;
 757 }
 758
 759 static void PingStart(void)
 760 {
 761 #if defined(CONFIG_NET_MULTI)
 762         printf ("Using %s device\n", eth_get_name());
 763 #endif  /* CONFIG_NET_MULTI */
 764         NetSetTimeout (10000UL, PingTimeout);
 765         NetSetHandler (PingHandler);
 766
 767         PingSend();
 768 }
 769 #endif
 770
 771 #if defined(CONFIG_CMD_CDP)
 772
 773 #define CDP_DEVICE_ID_TLV               0x0001
 774 #define CDP_ADDRESS_TLV                 0x0002
 775 #define CDP_PORT_ID_TLV                 0x0003
 776 #define CDP_CAPABILITIES_TLV            0x0004
 777 #define CDP_VERSION_TLV                 0x0005
 778 #define CDP_PLATFORM_TLV                0x0006
 779 #define CDP_NATIVE_VLAN_TLV             0x000a
 780 #define CDP_APPLIANCE_VLAN_TLV          0x000e
 781 #define CDP_TRIGGER_TLV                 0x000f
 782 #define CDP_POWER_CONSUMPTION_TLV       0x0010
 783 #define CDP_SYSNAME_TLV                 0x0014
 784 #define CDP_SYSOBJECT_TLV               0x0015
 785 #define CDP_MANAGEMENT_ADDRESS_TLV      0x0016
 786
 787 #define CDP_TIMEOUT                     250UL   /* one packet every 250ms */
 788
 789 static int CDPSeq;
 790 static int CDPOK;
 791
 792 ushort CDPNativeVLAN;
 793 ushort CDPApplianceVLAN;
 794
 795 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 0x00 };
 796
 797 static ushort CDP_compute_csum(const uchar *buff, ushort len)
 798 {
 799         ushort csum;
 800         int     odd;
 801         ulong   result = 0;
 802         ushort  leftover;
 803         ushort *p;
 804
 805         if (len > 0) {
 806                 odd = 1 & (ulong)buff;
 807                 if (odd) {
 808                         result = *buff << 8;
 809                         len--;
 810                         buff++;
 811                 }
 812                 while (len > 1) {
 813                         p = (ushort *)buff;
 814                         result += *p++;
 815                         buff = (uchar *)p;
 816                         if (result & 0x80000000)
 817                                 result = (result & 0xFFFF) + (result >> 16);
 818                         len -= 2;
 819                 }
 820                 if (len) {
 821                         leftover = (signed short)(*(const signed char *)buff);
 822                         /* CISCO SUCKS big time! (and blows too):
 823                          * CDP uses the IP checksum algorithm with a twist;
 824                          * for the last byte it *sign* extends and sums.
 825                          */
 826                         result = (result & 0xffff0000) | ((result + leftover) & 0x0000ffff);
 827                 }
 828                 while (result >> 16)
 829                         result = (result & 0xFFFF) + (result >> 16);
 830
 831                 if (odd)
 832                         result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
 833         }
 834
 835         /* add up 16-bit and 17-bit words for 17+c bits */
 836         result = (result & 0xffff) + (result >> 16);
 837         /* add up 16-bit and 2-bit for 16+c bit */
 838         result = (result & 0xffff) + (result >> 16);
 839         /* add up carry.. */
 840         result = (result & 0xffff) + (result >> 16);
 841
 842         /* negate */
 843         csum = ~(ushort)result;
 844
 845         /* run time endian detection */
 846         if (csum != htons(csum))        /* little endian */
 847                 csum = htons(csum);
 848
 849         return csum;
 850 }
 851
 852 int CDPSendTrigger(void)
 853 {
 854         volatile uchar *pkt;
 855         volatile ushort *s;
 856         volatile ushort *cp;
 857         Ethernet_t *et;
 858         int len;
 859         ushort chksum;
 860 #if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID)   || \
 861     defined(CONFIG_CDP_VERSION)   || defined(CONFIG_CDP_PLATFORM)
 862         char buf[32];
 863 #endif
 864
 865         pkt = NetTxPacket;
 866         et = (Ethernet_t *)pkt;
 867
 868         /* NOTE: trigger sent not on any VLAN */
 869
 870         /* form ethernet header */
 871         memcpy(et->et_dest, NetCDPAddr, 6);
 872         memcpy(et->et_src, NetOurEther, 6);
 873
 874         pkt += ETHER_HDR_SIZE;
 875
 876         /* SNAP header */
 877         memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr));
 878         pkt += sizeof(CDP_SNAP_hdr);
 879
 880         /* CDP header */
 881         *pkt++ = 0x02;                          /* CDP version 2 */
 882         *pkt++ = 180;                           /* TTL */
 883         s = (volatile ushort *)pkt;
 884         cp = s;
 885         *s++ = htons(0);                        /* checksum (0 for later calculation) */
 886
 887         /* CDP fields */
 888 #ifdef CONFIG_CDP_DEVICE_ID
 889         *s++ = htons(CDP_DEVICE_ID_TLV);
 890         *s++ = htons(CONFIG_CDP_DEVICE_ID);
 891         sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%pm", NetOurEther);
 892         memcpy((uchar *)s, buf, 16);
 893         s += 16 / 2;
 894 #endif
 895
 896 #ifdef CONFIG_CDP_PORT_ID
 897         *s++ = htons(CDP_PORT_ID_TLV);
 898         memset(buf, 0, sizeof(buf));
 899         sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index());
 900         len = strlen(buf);
 901         if (len & 1)    /* make it even */
 902                 len++;
 903         *s++ = htons(len + 4);
 904         memcpy((uchar *)s, buf, len);
 905         s += len / 2;
 906 #endif
 907
 908 #ifdef CONFIG_CDP_CAPABILITIES
 909         *s++ = htons(CDP_CAPABILITIES_TLV);
 910         *s++ = htons(8);
 911         *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES);
 912         s += 2;
 913 #endif
 914
 915 #ifdef CONFIG_CDP_VERSION
 916         *s++ = htons(CDP_VERSION_TLV);
 917         memset(buf, 0, sizeof(buf));
 918         strcpy(buf, CONFIG_CDP_VERSION);
 919         len = strlen(buf);
 920         if (len & 1)    /* make it even */
 921                 len++;
 922         *s++ = htons(len + 4);
 923         memcpy((uchar *)s, buf, len);
 924         s += len / 2;
 925 #endif
 926
 927 #ifdef CONFIG_CDP_PLATFORM
 928         *s++ = htons(CDP_PLATFORM_TLV);
 929         memset(buf, 0, sizeof(buf));
 930         strcpy(buf, CONFIG_CDP_PLATFORM);
 931         len = strlen(buf);
 932         if (len & 1)    /* make it even */
 933                 len++;
 934         *s++ = htons(len + 4);
 935         memcpy((uchar *)s, buf, len);
 936         s += len / 2;
 937 #endif
 938
 939 #ifdef CONFIG_CDP_TRIGGER
 940         *s++ = htons(CDP_TRIGGER_TLV);
 941         *s++ = htons(8);
 942         *(ulong *)s = htonl(CONFIG_CDP_TRIGGER);
 943         s += 2;
 944 #endif
 945
 946 #ifdef CONFIG_CDP_POWER_CONSUMPTION
 947         *s++ = htons(CDP_POWER_CONSUMPTION_TLV);
 948         *s++ = htons(6);
 949         *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION);
 950 #endif
 951
 952         /* length of ethernet packet */
 953         len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE);
 954         et->et_protlen = htons(len);
 955
 956         len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr);
 957         chksum = CDP_compute_csum((uchar *)NetTxPacket + len, (uchar *)s - (NetTxPacket + len));
 958         if (chksum == 0)
 959                 chksum = 0xFFFF;
 960         *cp = htons(chksum);
 961
 962         (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket);
 963         return 0;
 964 }
 965
 966 static void
 967 CDPTimeout (void)
 968 {
 969         CDPSeq++;
 970
 971         if (CDPSeq < 3) {
 972                 NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
 973                 CDPSendTrigger();
 974                 return;
 975         }
 976
 977         /* if not OK try again */
 978         if (!CDPOK)
 979                 NetStartAgain();
 980         else
 981                 NetState = NETLOOP_SUCCESS;
 982 }
 983
 984 static void
 985 CDPDummyHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
 986 {
 987         /* nothing */
 988 }
 989
 990 static void
 991 CDPHandler(const uchar * pkt, unsigned len)
 992 {
 993         const uchar *t;
 994         const ushort *ss;
 995         ushort type, tlen;
 996         uchar applid;
 997         ushort vlan, nvlan;
 998
 999         /* minimum size? */
1000         if (len < sizeof(CDP_SNAP_hdr) + 4)
1001                 goto pkt_short;
1002
1003         /* check for valid CDP SNAP header */
1004         if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0)
1005                 return;
1006
1007         pkt += sizeof(CDP_SNAP_hdr);
1008         len -= sizeof(CDP_SNAP_hdr);
1009
1010         /* Version of CDP protocol must be >= 2 and TTL != 0 */
1011         if (pkt[0] < 0x02 || pkt[1] == 0)
1012                 return;
1013
1014         /* if version is greater than 0x02 maybe we'll have a problem; output a warning */
1015         if (pkt[0] != 0x02)
1016                 printf("** WARNING: CDP packet received with a protocol version %d > 2\n",
1017                                 pkt[0] & 0xff);
1018
1019         if (CDP_compute_csum(pkt, len) != 0)
1020                 return;
1021
1022         pkt += 4;
1023         len -= 4;
1024
1025         vlan = htons(-1);
1026         nvlan = htons(-1);
1027         while (len > 0) {
1028                 if (len < 4)
1029                         goto pkt_short;
1030
1031                 ss = (const ushort *)pkt;
1032                 type = ntohs(ss[0]);
1033                 tlen = ntohs(ss[1]);
1034                 if (tlen > len) {
1035                         goto pkt_short;
1036                 }
1037
1038                 pkt += tlen;
1039                 len -= tlen;
1040
1041                 ss += 2;        /* point ss to the data of the TLV */
1042                 tlen -= 4;
1043
1044                 switch (type) {
1045                         case CDP_DEVICE_ID_TLV:
1046                                 break;
1047                         case CDP_ADDRESS_TLV:
1048                                 break;
1049                         case CDP_PORT_ID_TLV:
1050                                 break;
1051                         case CDP_CAPABILITIES_TLV:
1052                                 break;
1053                         case CDP_VERSION_TLV:
1054                                 break;
1055                         case CDP_PLATFORM_TLV:
1056                                 break;
1057                         case CDP_NATIVE_VLAN_TLV:
1058                                 nvlan = *ss;
1059                                 break;
1060                         case CDP_APPLIANCE_VLAN_TLV:
1061                                 t = (const uchar *)ss;
1062                                 while (tlen > 0) {
1063                                         if (tlen < 3)
1064                                                 goto pkt_short;
1065
1066                                         applid = t[0];
1067                                         ss = (const ushort *)(t + 1);
1068
1069 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE
1070                                         if (applid == CONFIG_CDP_APPLIANCE_VLAN_TYPE)
1071                                                 vlan = *ss;
1072 #else
1073                                         vlan = ntohs(*ss);      /* XXX will this work; dunno */
1074 #endif
1075                                         t += 3; tlen -= 3;
1076                                 }
1077                                 break;
1078                         case CDP_TRIGGER_TLV:
1079                                 break;
1080                         case CDP_POWER_CONSUMPTION_TLV:
1081                                 break;
1082                         case CDP_SYSNAME_TLV:
1083                                 break;
1084                         case CDP_SYSOBJECT_TLV:
1085                                 break;
1086                         case CDP_MANAGEMENT_ADDRESS_TLV:
1087                                 break;
1088                 }
1089         }
1090
1091         CDPApplianceVLAN = vlan;
1092         CDPNativeVLAN = nvlan;
1093
1094         CDPOK = 1;
1095         return;
1096
1097  pkt_short:
1098         printf("** CDP packet is too short\n");
1099         return;
1100 }
1101
1102 static void CDPStart(void)
1103 {
1104 #if defined(CONFIG_NET_MULTI)
1105         printf ("Using %s device\n", eth_get_name());
1106 #endif
1107         CDPSeq = 0;
1108         CDPOK = 0;
1109
1110         CDPNativeVLAN = htons(-1);
1111         CDPApplianceVLAN = htons(-1);
1112
1113         NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
1114         NetSetHandler (CDPDummyHandler);
1115
1116         CDPSendTrigger();
1117 }
1118 #endif
1119
1120
1121 void
1122 NetReceive(volatile uchar * inpkt, int len)
1123 {
1124         Ethernet_t *et;
1125         IP_t    *ip;
1126         ARP_t   *arp;
1127         IPaddr_t tmp;
1128         int     x;
1129         uchar *pkt;
1130 #if defined(CONFIG_CMD_CDP)
1131         int iscdp;
1132 #endif
1133         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1134
1135 #ifdef ET_DEBUG
1136         printf("packet received\n");
1137 #endif
1138
1139         NetRxPacket = inpkt;
1140         NetRxPacketLen = len;
1141         et = (Ethernet_t *)inpkt;
1142
1143         /* too small packet? */
1144         if (len < ETHER_HDR_SIZE)
1145                 return;
1146
1147 #ifdef CONFIG_API
1148         if (push_packet) {
1149                 (*push_packet)(inpkt, len);
1150                 return;
1151         }
1152 #endif
1153
1154 #if defined(CONFIG_CMD_CDP)
1155         /* keep track if packet is CDP */
1156         iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0;
1157 #endif
1158
1159         myvlanid = ntohs(NetOurVLAN);
1160         if (myvlanid == (ushort)-1)
1161                 myvlanid = VLAN_NONE;
1162         mynvlanid = ntohs(NetOurNativeVLAN);
1163         if (mynvlanid == (ushort)-1)
1164                 mynvlanid = VLAN_NONE;
1165
1166         x = ntohs(et->et_protlen);
1167
1168 #ifdef ET_DEBUG
1169         printf("packet received\n");
1170 #endif
1171
1172         if (x < 1514) {
1173                 /*
1174                  *      Got a 802 packet.  Check the other protocol field.
1175                  */
1176                 x = ntohs(et->et_prot);
1177
1178                 ip = (IP_t *)(inpkt + E802_HDR_SIZE);
1179                 len -= E802_HDR_SIZE;
1180
1181         } else if (x != PROT_VLAN) {    /* normal packet */
1182                 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE);
1183                 len -= ETHER_HDR_SIZE;
1184
1185         } else {                        /* VLAN packet */
1186                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et;
1187
1188 #ifdef ET_DEBUG
1189                 printf("VLAN packet received\n");
1190 #endif
1191                 /* too small packet? */
1192                 if (len < VLAN_ETHER_HDR_SIZE)
1193                         return;
1194
1195                 /* if no VLAN active */
1196                 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
1197 #if defined(CONFIG_CMD_CDP)
1198                                 && iscdp == 0
1199 #endif
1200                                 )
1201                         return;
1202
1203                 cti = ntohs(vet->vet_tag);
1204                 vlanid = cti & VLAN_IDMASK;
1205                 x = ntohs(vet->vet_type);
1206
1207                 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE);
1208                 len -= VLAN_ETHER_HDR_SIZE;
1209         }
1210
1211 #ifdef ET_DEBUG
1212         printf("Receive from protocol 0x%x\n", x);
1213 #endif
1214
1215 #if defined(CONFIG_CMD_CDP)
1216         if (iscdp) {
1217                 CDPHandler((uchar *)ip, len);
1218                 return;
1219         }
1220 #endif
1221
1222         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1223                 if (vlanid == VLAN_NONE)
1224                         vlanid = (mynvlanid & VLAN_IDMASK);
1225                 /* not matched? */
1226                 if (vlanid != (myvlanid & VLAN_IDMASK))
1227                         return;
1228         }
1229
1230         switch (x) {
1231
1232         case PROT_ARP:
1233                 /*
1234                  * We have to deal with two types of ARP packets:
1235                  * - REQUEST packets will be answered by sending  our
1236                  *   IP address - if we know it.
1237                  * - REPLY packates are expected only after we asked
1238                  *   for the TFTP server's or the gateway's ethernet
1239                  *   address; so if we receive such a packet, we set
1240                  *   the server ethernet address
1241                  */
1242 #ifdef ET_DEBUG
1243                 puts ("Got ARP\n");
1244 #endif
1245                 arp = (ARP_t *)ip;
1246                 if (len < ARP_HDR_SIZE) {
1247                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1248                         return;
1249                 }
1250                 if (ntohs(arp->ar_hrd) != ARP_ETHER) {
1251                         return;
1252                 }
1253                 if (ntohs(arp->ar_pro) != PROT_IP) {
1254                         return;
1255                 }
1256                 if (arp->ar_hln != 6) {
1257                         return;
1258                 }
1259                 if (arp->ar_pln != 4) {
1260                         return;
1261                 }
1262
1263                 if (NetOurIP == 0) {
1264                         return;
1265                 }
1266
1267                 if (NetReadIP(&arp->ar_data[16]) != NetOurIP) {
1268                         return;
1269                 }
1270
1271                 switch (ntohs(arp->ar_op)) {
1272                 case ARPOP_REQUEST:             /* reply with our IP address    */
1273 #ifdef ET_DEBUG
1274                         puts ("Got ARP REQUEST, return our IP\n");
1275 #endif
1276                         pkt = (uchar *)et;
1277                         pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
1278                         arp->ar_op = htons(ARPOP_REPLY);
1279                         memcpy   (&arp->ar_data[10], &arp->ar_data[0], 6);
1280                         NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
1281                         memcpy   (&arp->ar_data[ 0], NetOurEther, 6);
1282                         NetCopyIP(&arp->ar_data[ 6], &NetOurIP);
1283                         (void) eth_send((uchar *)et, (pkt - (uchar *)et) + ARP_HDR_SIZE);
1284                         return;
1285
1286                 case ARPOP_REPLY:               /* arp reply */
1287                         /* are we waiting for a reply */
1288                         if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
1289                                 break;
1290 #ifdef ET_DEBUG
1291                         printf("Got ARP REPLY, set server/gtwy eth addr (%pM)\n",
1292                                 arp->ar_data);
1293 #endif
1294
1295                         tmp = NetReadIP(&arp->ar_data[6]);
1296
1297                         /* matched waiting packet's address */
1298                         if (tmp == NetArpWaitReplyIP) {
1299 #ifdef ET_DEBUG
1300                                 puts ("Got it\n");
1301 #endif
1302                                 /* save address for later use */
1303                                 memcpy(NetArpWaitPacketMAC, &arp->ar_data[0], 6);
1304
1305 #ifdef CONFIG_NETCONSOLE
1306                                 (*packetHandler)(0,0,0,0);
1307 #endif
1308                                 /* modify header, and transmit it */
1309                                 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6);
1310                                 (void) eth_send(NetArpWaitTxPacket, NetArpWaitTxPacketSize);
1311
1312                                 /* no arp request pending now */
1313                                 NetArpWaitPacketIP = 0;
1314                                 NetArpWaitTxPacketSize = 0;
1315                                 NetArpWaitPacketMAC = NULL;
1316
1317                         }
1318                         return;
1319                 default:
1320 #ifdef ET_DEBUG
1321                         printf("Unexpected ARP opcode 0x%x\n", ntohs(arp->ar_op));
1322 #endif
1323                         return;
1324                 }
1325                 break;
1326
1327         case PROT_RARP:
1328 #ifdef ET_DEBUG
1329                 puts ("Got RARP\n");
1330 #endif
1331                 arp = (ARP_t *)ip;
1332                 if (len < ARP_HDR_SIZE) {
1333                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1334                         return;
1335                 }
1336
1337                 if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
1338                         (ntohs(arp->ar_hrd) != ARP_ETHER)   ||
1339                         (ntohs(arp->ar_pro) != PROT_IP)     ||
1340                         (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
1341
1342                         puts ("invalid RARP header\n");
1343                 } else {
1344                         NetCopyIP(&NetOurIP,    &arp->ar_data[16]);
1345                         if (NetServerIP == 0)
1346                                 NetCopyIP(&NetServerIP, &arp->ar_data[ 6]);
1347                         memcpy (NetServerEther, &arp->ar_data[ 0], 6);
1348
1349                         (*packetHandler)(0,0,0,0);
1350                 }
1351                 break;
1352
1353         case PROT_IP:
1354 #ifdef ET_DEBUG
1355                 puts ("Got IP\n");
1356 #endif
1357                 if (len < IP_HDR_SIZE) {
1358                         debug ("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE);
1359                         return;
1360                 }
1361                 if (len < ntohs(ip->ip_len)) {
1362                         printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
1363                         return;
1364                 }
1365                 len = ntohs(ip->ip_len);
1366 #ifdef ET_DEBUG
1367                 printf("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
1368 #endif
1369                 if ((ip->ip_hl_v & 0xf0) != 0x40) {
1370                         return;
1371                 }
1372                 /* Can't deal with fragments */
1373                 if (ip->ip_off & htons(IP_OFFS | IP_FLAGS_MFRAG)) {
1374                         return;
1375                 }
1376                 /* can't deal with headers > 20 bytes */
1377                 if ((ip->ip_hl_v & 0x0f) > 0x05) {
1378                         return;
1379                 }
1380                 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
1381                         puts ("checksum bad\n");
1382                         return;
1383                 }
1384                 tmp = NetReadIP(&ip->ip_dst);
1385                 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
1386 #ifdef CONFIG_MCAST_TFTP
1387                         if (Mcast_addr != tmp)
1388 #endif
1389                         return;
1390                 }
1391                 /*
1392                  * watch for ICMP host redirects
1393                  *
1394                  * There is no real handler code (yet). We just watch
1395                  * for ICMP host redirect messages. In case anybody
1396                  * sees these messages: please contact me
1397                  * (wd@denx.de), or - even better - send me the
1398                  * necessary fixes :-)
1399                  *
1400                  * Note: in all cases where I have seen this so far
1401                  * it was a problem with the router configuration,
1402                  * for instance when a router was configured in the
1403                  * BOOTP reply, but the TFTP server was on the same
1404                  * subnet. So this is probably a warning that your
1405                  * configuration might be wrong. But I'm not really
1406                  * sure if there aren't any other situations.
1407                  */
1408                 if (ip->ip_p == IPPROTO_ICMP) {
1409                         ICMP_t *icmph = (ICMP_t *)&(ip->udp_src);
1410
1411                         switch (icmph->type) {
1412                         case ICMP_REDIRECT:
1413                                 if (icmph->code != ICMP_REDIR_HOST)
1414                                         return;
1415                                 printf (" ICMP Host Redirect to %pI4 ", &icmph->un.gateway);
1416                                 return;
1417 #if defined(CONFIG_CMD_PING)
1418                         case ICMP_ECHO_REPLY:
1419                                 /*
1420                                  *      IP header OK.  Pass the packet to the current handler.
1421                                  */
1422                                 /* XXX point to ip packet */
1423                                 (*packetHandler)((uchar *)ip, 0, 0, 0);
1424                                 return;
1425                         case ICMP_ECHO_REQUEST:
1426 #ifdef ET_DEBUG
1427                                 printf ("Got ICMP ECHO REQUEST, return %d bytes \n",
1428                                         ETHER_HDR_SIZE + len);
1429 #endif
1430                                 memcpy (&et->et_dest[0], &et->et_src[0], 6);
1431                                 memcpy (&et->et_src[ 0], NetOurEther, 6);
1432
1433                                 ip->ip_sum = 0;
1434                                 ip->ip_off = 0;
1435                                 NetCopyIP((void*)&ip->ip_dst, &ip->ip_src);
1436                                 NetCopyIP((void*)&ip->ip_src, &NetOurIP);
1437                                 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP >> 1);
1438
1439                                 icmph->type = ICMP_ECHO_REPLY;
1440                                 icmph->checksum = 0;
1441                                 icmph->checksum = ~NetCksum((uchar *)icmph,
1442                                                 (len - IP_HDR_SIZE_NO_UDP) >> 1);
1443                                 (void) eth_send((uchar *)et, ETHER_HDR_SIZE + len);
1444                                 return;
1445 #endif
1446                         default:
1447                                 return;
1448                         }
1449                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1450                         return;
1451                 }
1452
1453 #ifdef CONFIG_UDP_CHECKSUM
1454                 if (ip->udp_xsum != 0) {
1455                         ulong   xsum;
1456                         ushort *sumptr;
1457                         ushort  sumlen;
1458
1459                         xsum  = ip->ip_p;
1460                         xsum += (ntohs(ip->udp_len));
1461                         xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
1462                         xsum += (ntohl(ip->ip_src) >>  0) & 0x0000ffff;
1463                         xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
1464                         xsum += (ntohl(ip->ip_dst) >>  0) & 0x0000ffff;
1465
1466                         sumlen = ntohs(ip->udp_len);
1467                         sumptr = (ushort *) &(ip->udp_src);
1468
1469                         while (sumlen > 1) {
1470                                 ushort sumdata;
1471
1472                                 sumdata = *sumptr++;
1473                                 xsum += ntohs(sumdata);
1474                                 sumlen -= 2;
1475                         }
1476                         if (sumlen > 0) {
1477                                 ushort sumdata;
1478
1479                                 sumdata = *(unsigned char *) sumptr;
1480                                 sumdata = (sumdata << 8) & 0xff00;
1481                                 xsum += sumdata;
1482                         }
1483                         while ((xsum >> 16) != 0) {
1484                                 xsum = (xsum & 0x0000ffff) + ((xsum >> 16) & 0x0000ffff);
1485                         }
1486                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1487                                 printf(" UDP wrong checksum %08lx %08x\n",
1488                                         xsum, ntohs(ip->udp_xsum));
1489                                 return;
1490                         }
1491                 }
1492 #endif
1493
1494
1495 #ifdef CONFIG_NETCONSOLE
1496                 nc_input_packet((uchar *)ip +IP_HDR_SIZE,
1497                                                 ntohs(ip->udp_dst),
1498                                                 ntohs(ip->udp_src),
1499                                                 ntohs(ip->udp_len) - 8);
1500 #endif
1501                 /*
1502                  *      IP header OK.  Pass the packet to the current handler.
1503                  */
1504                 (*packetHandler)((uchar *)ip +IP_HDR_SIZE,
1505                                                 ntohs(ip->udp_dst),
1506                                                 ntohs(ip->udp_src),
1507                                                 ntohs(ip->udp_len) - 8);
1508                 break;
1509         }
1510 }
1511
1512
1513 /**********************************************************************/
1514
1515 static int net_check_prereq (proto_t protocol)
1516 {
1517         switch (protocol) {
1518                 /* Fall through */
1519 #if defined(CONFIG_CMD_PING)
1520         case PING:
1521                 if (NetPingIP == 0) {
1522                         puts ("*** ERROR: ping address not given\n");
1523                         return (1);
1524                 }
1525                 goto common;
1526 #endif
1527 #if defined(CONFIG_CMD_SNTP)
1528         case SNTP:
1529                 if (NetNtpServerIP == 0) {
1530                         puts ("*** ERROR: NTP server address not given\n");
1531                         return (1);
1532                 }
1533                 goto common;
1534 #endif
1535 #if defined(CONFIG_CMD_DNS)
1536         case DNS:
1537                 if (NetOurDNSIP == 0) {
1538                         puts("*** ERROR: DNS server address not given\n");
1539                         return 1;
1540                 }
1541                 goto common;
1542 #endif
1543 #if defined(CONFIG_CMD_NFS)
1544         case NFS:
1545 #endif
1546         case NETCONS:
1547         case TFTP:
1548                 if (NetServerIP == 0) {
1549                         puts ("*** ERROR: `serverip' not set\n");
1550                         return (1);
1551                 }
1552 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP)
1553     common:
1554 #endif
1555
1556                 if (NetOurIP == 0) {
1557                         puts ("*** ERROR: `ipaddr' not set\n");
1558                         return (1);
1559                 }
1560                 /* Fall through */
1561
1562         case DHCP:
1563         case RARP:
1564         case BOOTP:
1565         case CDP:
1566                 if (memcmp (NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
1567 #ifdef CONFIG_NET_MULTI
1568                         extern int eth_get_dev_index (void);
1569                         int num = eth_get_dev_index ();
1570
1571                         switch (num) {
1572                         case -1:
1573                                 puts ("*** ERROR: No ethernet found.\n");
1574                                 return (1);
1575                         case 0:
1576                                 puts ("*** ERROR: `ethaddr' not set\n");
1577                                 break;
1578                         default:
1579                                 printf ("*** ERROR: `eth%daddr' not set\n",
1580                                         num);
1581                                 break;
1582                         }
1583
1584                         NetStartAgain ();
1585                         return (2);
1586 #else
1587                         puts ("*** ERROR: `ethaddr' not set\n");
1588                         return (1);
1589 #endif
1590                 }
1591                 /* Fall through */
1592         default:
1593                 return (0);
1594         }
1595         return (0);             /* OK */
1596 }
1597 /**********************************************************************/
1598
1599 int
1600 NetCksumOk(uchar * ptr, int len)
1601 {
1602         return !((NetCksum(ptr, len) + 1) & 0xfffe);
1603 }
1604
1605
1606 unsigned
1607 NetCksum(uchar * ptr, int len)
1608 {
1609         ulong   xsum;
1610         ushort *p = (ushort *)ptr;
1611
1612         xsum = 0;
1613         while (len-- > 0)
1614                 xsum += *p++;
1615         xsum = (xsum & 0xffff) + (xsum >> 16);
1616         xsum = (xsum & 0xffff) + (xsum >> 16);
1617         return (xsum & 0xffff);
1618 }
1619
1620 int
1621 NetEthHdrSize(void)
1622 {
1623         ushort myvlanid;
1624
1625         myvlanid = ntohs(NetOurVLAN);
1626         if (myvlanid == (ushort)-1)
1627                 myvlanid = VLAN_NONE;
1628
1629         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : VLAN_ETHER_HDR_SIZE;
1630 }
1631
1632 int
1633 NetSetEther(volatile uchar * xet, uchar * addr, uint prot)
1634 {
1635         Ethernet_t *et = (Ethernet_t *)xet;
1636         ushort myvlanid;
1637
1638         myvlanid = ntohs(NetOurVLAN);
1639         if (myvlanid == (ushort)-1)
1640                 myvlanid = VLAN_NONE;
1641
1642         memcpy (et->et_dest, addr, 6);
1643         memcpy (et->et_src, NetOurEther, 6);
1644         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1645         et->et_protlen = htons(prot);
1646                 return ETHER_HDR_SIZE;
1647         } else {
1648                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet;
1649
1650                 vet->vet_vlan_type = htons(PROT_VLAN);
1651                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1652                 vet->vet_type = htons(prot);
1653                 return VLAN_ETHER_HDR_SIZE;
1654         }
1655 }
1656
1657 void
1658 NetSetIP(volatile uchar * xip, IPaddr_t dest, int dport, int sport, int len)
1659 {
1660         IP_t *ip = (IP_t *)xip;
1661
1662         /*
1663          *      If the data is an odd number of bytes, zero the
1664          *      byte after the last byte so that the checksum
1665          *      will work.
1666          */
1667         if (len & 1)
1668                 xip[IP_HDR_SIZE + len] = 0;
1669
1670         /*
1671          *      Construct an IP and UDP header.
1672          *      (need to set no fragment bit - XXX)
1673          */
1674         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
1675         ip->ip_tos   = 0;
1676         ip->ip_len   = htons(IP_HDR_SIZE + len);
1677         ip->ip_id    = htons(NetIPID++);
1678         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1679         ip->ip_ttl   = 255;
1680         ip->ip_p     = 17;              /* UDP */
1681         ip->ip_sum   = 0;
1682         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
1683         NetCopyIP((void*)&ip->ip_dst, &dest);      /* - "" - */
1684         ip->udp_src  = htons(sport);
1685         ip->udp_dst  = htons(dport);
1686         ip->udp_len  = htons(8 + len);
1687         ip->udp_xsum = 0;
1688         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
1689 }
1690
1691 void copy_filename (char *dst, char *src, int size)
1692 {
1693         if (*src && (*src == '"')) {
1694                 ++src;
1695                 --size;
1696         }
1697
1698         while ((--size > 0) && *src && (*src != '"')) {
1699                 *dst++ = *src++;
1700         }
1701         *dst = '\0';
1702 }
1703
1704 #endif
1705
1706 #if defined(CONFIG_CMD_NFS) || defined(CONFIG_CMD_SNTP) || defined(CONFIG_CMD_DNS)
1707 /*
1708  * make port a little random, but use something trivial to compute
1709  */
1710 unsigned int random_port(void)
1711 {
1712         return 1024 + (get_timer(0) % 0x8000);;
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 IPaddr_t getenv_IPaddr (char *var)
1776 {
1777         return (string_to_ip(getenv(var)));
1778 }
1779
1780 ushort getenv_VLAN(char *var)
1781 {
1782         return (string_to_VLAN(getenv(var)));
1783 }