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                         DhcpRequest();          /* Basically same as BOOTP */
 398                         break;
 399 #endif
 400
 401                 case BOOTP:
 402                         BootpTry = 0;
 403                         BootpRequest ();
 404                         break;
 405
 406                 case RARP:
 407                         RarpTry = 0;
 408                         RarpRequest ();
 409                         break;
 410 #if defined(CONFIG_CMD_PING)
 411                 case PING:
 412                         PingStart();
 413                         break;
 414 #endif
 415 #if defined(CONFIG_CMD_NFS)
 416                 case NFS:
 417                         NfsStart();
 418                         break;
 419 #endif
 420 #if defined(CONFIG_CMD_CDP)
 421                 case CDP:
 422                         CDPStart();
 423                         break;
 424 #endif
 425 #ifdef CONFIG_NETCONSOLE
 426                 case NETCONS:
 427                         NcStart();
 428                         break;
 429 #endif
 430 #if defined(CONFIG_CMD_SNTP)
 431                 case SNTP:
 432                         SntpStart();
 433                         break;
 434 #endif
 435 #if defined(CONFIG_CMD_DNS)
 436                 case DNS:
 437                         DnsStart();
 438                         break;
 439 #endif
 440                 default:
 441                         break;
 442                 }
 443
 444                 NetBootFileXferSize = 0;
 445                 break;
 446         }
 447
 448 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 449 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && defined(CONFIG_STATUS_LED) && defined(STATUS_LED_RED)
 450         /*
 451          * Echo the inverted link state to the fault LED.
 452          */
 453         if(miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) {
 454                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 455         } else {
 456                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 457         }
 458 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 459 #endif /* CONFIG_MII, ... */
 460
 461         /*
 462          *      Main packet reception loop.  Loop receiving packets until
 463          *      someone sets `NetState' to a state that terminates.
 464          */
 465         for (;;) {
 466                 WATCHDOG_RESET();
 467 #ifdef CONFIG_SHOW_ACTIVITY
 468                 {
 469                         extern void show_activity(int arg);
 470                         show_activity(1);
 471                 }
 472 #endif
 473                 /*
 474                  *      Check the ethernet for a new packet.  The ethernet
 475                  *      receive routine will process it.
 476                  */
 477                 eth_rx();
 478
 479                 /*
 480                  *      Abort if ctrl-c was pressed.
 481                  */
 482                 if (ctrlc()) {
 483                         eth_halt();
 484                         puts ("\nAbort\n");
 485                         return (-1);
 486                 }
 487
 488                 ArpTimeoutCheck();
 489
 490                 /*
 491                  *      Check for a timeout, and run the timeout handler
 492                  *      if we have one.
 493                  */
 494                 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
 495                         thand_f *x;
 496
 497 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 498 #  if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \
 499       defined(CONFIG_STATUS_LED) &&        \
 500       defined(STATUS_LED_RED)
 501                         /*
 502                          * Echo the inverted link state to the fault LED.
 503                          */
 504                         if(miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) {
 505                                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 506                         } else {
 507                                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 508                         }
 509 #  endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 510 #endif /* CONFIG_MII, ... */
 511                         x = timeHandler;
 512                         timeHandler = (thand_f *)0;
 513                         (*x)();
 514                 }
 515
 516
 517                 switch (NetState) {
 518
 519                 case NETLOOP_RESTART:
 520 #ifdef CONFIG_NET_MULTI
 521                         NetRestarted = 1;
 522 #endif
 523                         goto restart;
 524
 525                 case NETLOOP_SUCCESS:
 526                         if (NetBootFileXferSize > 0) {
 527                                 char buf[20];
 528                                 printf("Bytes transferred = %ld (%lx hex)\n",
 529                                         NetBootFileXferSize,
 530                                         NetBootFileXferSize);
 531                                 sprintf(buf, "%lX", NetBootFileXferSize);
 532                                 setenv("filesize", buf);
 533
 534                                 sprintf(buf, "%lX", (unsigned long)load_addr);
 535                                 setenv("fileaddr", buf);
 536                         }
 537                         eth_halt();
 538                         return NetBootFileXferSize;
 539
 540                 case NETLOOP_FAIL:
 541                         return (-1);
 542                 }
 543         }
 544 }
 545
 546 /**********************************************************************/
 547
 548 static void
 549 startAgainTimeout(void)
 550 {
 551         NetState = NETLOOP_RESTART;
 552 }
 553
 554 static void
 555 startAgainHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
 556 {
 557         /* Totally ignore the packet */
 558 }
 559
 560 void NetStartAgain (void)
 561 {
 562         char *nretry;
 563         int noretry = 0, once = 0;
 564
 565         if ((nretry = getenv ("netretry")) != NULL) {
 566                 noretry = (strcmp (nretry, "no") == 0);
 567                 once = (strcmp (nretry, "once") == 0);
 568         }
 569         if (noretry) {
 570                 eth_halt ();
 571                 NetState = NETLOOP_FAIL;
 572                 return;
 573         }
 574 #ifndef CONFIG_NET_MULTI
 575         NetSetTimeout (10000UL, startAgainTimeout);
 576         NetSetHandler (startAgainHandler);
 577 #else   /* !CONFIG_NET_MULTI*/
 578         eth_halt ();
 579 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
 580         eth_try_another (!NetRestarted);
 581 #endif
 582         eth_init (gd->bd);
 583         if (NetRestartWrap) {
 584                 NetRestartWrap = 0;
 585                 if (NetDevExists && !once) {
 586                         NetSetTimeout (10000UL, startAgainTimeout);
 587                         NetSetHandler (startAgainHandler);
 588                 } else {
 589                         NetState = NETLOOP_FAIL;
 590                 }
 591         } else {
 592                 NetState = NETLOOP_RESTART;
 593         }
 594 #endif  /* CONFIG_NET_MULTI */
 595 }
 596
 597 /**********************************************************************/
 598 /*
 599  *      Miscelaneous bits.
 600  */
 601
 602 void
 603 NetSetHandler(rxhand_f * f)
 604 {
 605         packetHandler = f;
 606 }
 607
 608
 609 void
 610 NetSetTimeout(ulong iv, thand_f * f)
 611 {
 612         if (iv == 0) {
 613                 timeHandler = (thand_f *)0;
 614         } else {
 615                 timeHandler = f;
 616                 timeStart = get_timer(0);
 617                 timeDelta = iv;
 618         }
 619 }
 620
 621
 622 void
 623 NetSendPacket(volatile uchar * pkt, int len)
 624 {
 625         (void) eth_send(pkt, len);
 626 }
 627
 628 int
 629 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
 630 {
 631         uchar *pkt;
 632
 633         /* convert to new style broadcast */
 634         if (dest == 0)
 635                 dest = 0xFFFFFFFF;
 636
 637         /* if broadcast, make the ether address a broadcast and don't do ARP */
 638         if (dest == 0xFFFFFFFF)
 639                 ether = NetBcastAddr;
 640
 641         /* if MAC address was not discovered yet, save the packet and do an ARP request */
 642         if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
 643
 644 #ifdef ET_DEBUG
 645                 printf("sending ARP for %08lx\n", dest);
 646 #endif
 647                 NetArpWaitPacketIP = dest;
 648                 NetArpWaitPacketMAC = ether;
 649
 650                 pkt = NetArpWaitTxPacket;
 651                 pkt += NetSetEther (pkt, NetArpWaitPacketMAC, PROT_IP);
 652
 653                 NetSetIP (pkt, dest, dport, sport, len);
 654                 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len);
 655
 656                 /* size of the waiting packet */
 657                 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE + len;
 658
 659                 /* and do the ARP request */
 660                 NetArpWaitTry = 1;
 661                 NetArpWaitTimerStart = get_timer(0);
 662                 ArpRequest();
 663                 return 1;       /* waiting */
 664         }
 665
 666 #ifdef ET_DEBUG
 667         printf("sending UDP to %08lx/%pM\n", dest, ether);
 668 #endif
 669
 670         pkt = (uchar *)NetTxPacket;
 671         pkt += NetSetEther (pkt, ether, PROT_IP);
 672         NetSetIP (pkt, dest, dport, sport, len);
 673         (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len);
 674
 675         return 0;       /* transmitted */
 676 }
 677
 678 #if defined(CONFIG_CMD_PING)
 679 static ushort PingSeqNo;
 680
 681 int PingSend(void)
 682 {
 683         static uchar mac[6];
 684         volatile IP_t *ip;
 685         volatile ushort *s;
 686         uchar *pkt;
 687
 688         /* XXX always send arp request */
 689
 690         memcpy(mac, NetEtherNullAddr, 6);
 691
 692 #ifdef ET_DEBUG
 693         printf("sending ARP for %08lx\n", NetPingIP);
 694 #endif
 695
 696         NetArpWaitPacketIP = NetPingIP;
 697         NetArpWaitPacketMAC = mac;
 698
 699         pkt = NetArpWaitTxPacket;
 700         pkt += NetSetEther(pkt, mac, PROT_IP);
 701
 702         ip = (volatile IP_t *)pkt;
 703
 704         /*
 705          *      Construct an IP and ICMP header.  (need to set no fragment bit - XXX)
 706          */
 707         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
 708         ip->ip_tos   = 0;
 709         ip->ip_len   = htons(IP_HDR_SIZE_NO_UDP + 8);
 710         ip->ip_id    = htons(NetIPID++);
 711         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
 712         ip->ip_ttl   = 255;
 713         ip->ip_p     = 0x01;            /* ICMP */
 714         ip->ip_sum   = 0;
 715         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
 716         NetCopyIP((void*)&ip->ip_dst, &NetPingIP);         /* - "" - */
 717         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
 718
 719         s = &ip->udp_src;               /* XXX ICMP starts here */
 720         s[0] = htons(0x0800);           /* echo-request, code */
 721         s[1] = 0;                       /* checksum */
 722         s[2] = 0;                       /* identifier */
 723         s[3] = htons(PingSeqNo++);      /* sequence number */
 724         s[1] = ~NetCksum((uchar *)s, 8/2);
 725
 726         /* size of the waiting packet */
 727         NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8;
 728
 729         /* and do the ARP request */
 730         NetArpWaitTry = 1;
 731         NetArpWaitTimerStart = get_timer(0);
 732         ArpRequest();
 733         return 1;       /* waiting */
 734 }
 735
 736 static void
 737 PingTimeout (void)
 738 {
 739         eth_halt();
 740         NetState = NETLOOP_FAIL;        /* we did not get the reply */
 741 }
 742
 743 static void
 744 PingHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
 745 {
 746         IPaddr_t tmp;
 747         volatile IP_t *ip = (volatile IP_t *)pkt;
 748
 749         tmp = NetReadIP((void *)&ip->ip_src);
 750         if (tmp != NetPingIP)
 751                 return;
 752
 753         NetState = NETLOOP_SUCCESS;
 754 }
 755
 756 static void PingStart(void)
 757 {
 758 #if defined(CONFIG_NET_MULTI)
 759         printf ("Using %s device\n", eth_get_name());
 760 #endif  /* CONFIG_NET_MULTI */
 761         NetSetTimeout (10000UL, PingTimeout);
 762         NetSetHandler (PingHandler);
 763
 764         PingSend();
 765 }
 766 #endif
 767
 768 #if defined(CONFIG_CMD_CDP)
 769
 770 #define CDP_DEVICE_ID_TLV               0x0001
 771 #define CDP_ADDRESS_TLV                 0x0002
 772 #define CDP_PORT_ID_TLV                 0x0003
 773 #define CDP_CAPABILITIES_TLV            0x0004
 774 #define CDP_VERSION_TLV                 0x0005
 775 #define CDP_PLATFORM_TLV                0x0006
 776 #define CDP_NATIVE_VLAN_TLV             0x000a
 777 #define CDP_APPLIANCE_VLAN_TLV          0x000e
 778 #define CDP_TRIGGER_TLV                 0x000f
 779 #define CDP_POWER_CONSUMPTION_TLV       0x0010
 780 #define CDP_SYSNAME_TLV                 0x0014
 781 #define CDP_SYSOBJECT_TLV               0x0015
 782 #define CDP_MANAGEMENT_ADDRESS_TLV      0x0016
 783
 784 #define CDP_TIMEOUT                     250UL   /* one packet every 250ms */
 785
 786 static int CDPSeq;
 787 static int CDPOK;
 788
 789 ushort CDPNativeVLAN;
 790 ushort CDPApplianceVLAN;
 791
 792 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 0x00 };
 793
 794 static ushort CDP_compute_csum(const uchar *buff, ushort len)
 795 {
 796         ushort csum;
 797         int     odd;
 798         ulong   result = 0;
 799         ushort  leftover;
 800         ushort *p;
 801
 802         if (len > 0) {
 803                 odd = 1 & (ulong)buff;
 804                 if (odd) {
 805                         result = *buff << 8;
 806                         len--;
 807                         buff++;
 808                 }
 809                 while (len > 1) {
 810                         p = (ushort *)buff;
 811                         result += *p++;
 812                         buff = (uchar *)p;
 813                         if (result & 0x80000000)
 814                                 result = (result & 0xFFFF) + (result >> 16);
 815                         len -= 2;
 816                 }
 817                 if (len) {
 818                         leftover = (signed short)(*(const signed char *)buff);
 819                         /* CISCO SUCKS big time! (and blows too):
 820                          * CDP uses the IP checksum algorithm with a twist;
 821                          * for the last byte it *sign* extends and sums.
 822                          */
 823                         result = (result & 0xffff0000) | ((result + leftover) & 0x0000ffff);
 824                 }
 825                 while (result >> 16)
 826                         result = (result & 0xFFFF) + (result >> 16);
 827
 828                 if (odd)
 829                         result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
 830         }
 831
 832         /* add up 16-bit and 17-bit words for 17+c bits */
 833         result = (result & 0xffff) + (result >> 16);
 834         /* add up 16-bit and 2-bit for 16+c bit */
 835         result = (result & 0xffff) + (result >> 16);
 836         /* add up carry.. */
 837         result = (result & 0xffff) + (result >> 16);
 838
 839         /* negate */
 840         csum = ~(ushort)result;
 841
 842         /* run time endian detection */
 843         if (csum != htons(csum))        /* little endian */
 844                 csum = htons(csum);
 845
 846         return csum;
 847 }
 848
 849 int CDPSendTrigger(void)
 850 {
 851         volatile uchar *pkt;
 852         volatile ushort *s;
 853         volatile ushort *cp;
 854         Ethernet_t *et;
 855         int len;
 856         ushort chksum;
 857 #if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID)   || \
 858     defined(CONFIG_CDP_VERSION)   || defined(CONFIG_CDP_PLATFORM)
 859         char buf[32];
 860 #endif
 861
 862         pkt = NetTxPacket;
 863         et = (Ethernet_t *)pkt;
 864
 865         /* NOTE: trigger sent not on any VLAN */
 866
 867         /* form ethernet header */
 868         memcpy(et->et_dest, NetCDPAddr, 6);
 869         memcpy(et->et_src, NetOurEther, 6);
 870
 871         pkt += ETHER_HDR_SIZE;
 872
 873         /* SNAP header */
 874         memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr));
 875         pkt += sizeof(CDP_SNAP_hdr);
 876
 877         /* CDP header */
 878         *pkt++ = 0x02;                          /* CDP version 2 */
 879         *pkt++ = 180;                           /* TTL */
 880         s = (volatile ushort *)pkt;
 881         cp = s;
 882         *s++ = htons(0);                        /* checksum (0 for later calculation) */
 883
 884         /* CDP fields */
 885 #ifdef CONFIG_CDP_DEVICE_ID
 886         *s++ = htons(CDP_DEVICE_ID_TLV);
 887         *s++ = htons(CONFIG_CDP_DEVICE_ID);
 888         sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%pm", NetOurEther);
 889         memcpy((uchar *)s, buf, 16);
 890         s += 16 / 2;
 891 #endif
 892
 893 #ifdef CONFIG_CDP_PORT_ID
 894         *s++ = htons(CDP_PORT_ID_TLV);
 895         memset(buf, 0, sizeof(buf));
 896         sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index());
 897         len = strlen(buf);
 898         if (len & 1)    /* make it even */
 899                 len++;
 900         *s++ = htons(len + 4);
 901         memcpy((uchar *)s, buf, len);
 902         s += len / 2;
 903 #endif
 904
 905 #ifdef CONFIG_CDP_CAPABILITIES
 906         *s++ = htons(CDP_CAPABILITIES_TLV);
 907         *s++ = htons(8);
 908         *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES);
 909         s += 2;
 910 #endif
 911
 912 #ifdef CONFIG_CDP_VERSION
 913         *s++ = htons(CDP_VERSION_TLV);
 914         memset(buf, 0, sizeof(buf));
 915         strcpy(buf, CONFIG_CDP_VERSION);
 916         len = strlen(buf);
 917         if (len & 1)    /* make it even */
 918                 len++;
 919         *s++ = htons(len + 4);
 920         memcpy((uchar *)s, buf, len);
 921         s += len / 2;
 922 #endif
 923
 924 #ifdef CONFIG_CDP_PLATFORM
 925         *s++ = htons(CDP_PLATFORM_TLV);
 926         memset(buf, 0, sizeof(buf));
 927         strcpy(buf, CONFIG_CDP_PLATFORM);
 928         len = strlen(buf);
 929         if (len & 1)    /* make it even */
 930                 len++;
 931         *s++ = htons(len + 4);
 932         memcpy((uchar *)s, buf, len);
 933         s += len / 2;
 934 #endif
 935
 936 #ifdef CONFIG_CDP_TRIGGER
 937         *s++ = htons(CDP_TRIGGER_TLV);
 938         *s++ = htons(8);
 939         *(ulong *)s = htonl(CONFIG_CDP_TRIGGER);
 940         s += 2;
 941 #endif
 942
 943 #ifdef CONFIG_CDP_POWER_CONSUMPTION
 944         *s++ = htons(CDP_POWER_CONSUMPTION_TLV);
 945         *s++ = htons(6);
 946         *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION);
 947 #endif
 948
 949         /* length of ethernet packet */
 950         len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE);
 951         et->et_protlen = htons(len);
 952
 953         len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr);
 954         chksum = CDP_compute_csum((uchar *)NetTxPacket + len, (uchar *)s - (NetTxPacket + len));
 955         if (chksum == 0)
 956                 chksum = 0xFFFF;
 957         *cp = htons(chksum);
 958
 959         (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket);
 960         return 0;
 961 }
 962
 963 static void
 964 CDPTimeout (void)
 965 {
 966         CDPSeq++;
 967
 968         if (CDPSeq < 3) {
 969                 NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
 970                 CDPSendTrigger();
 971                 return;
 972         }
 973
 974         /* if not OK try again */
 975         if (!CDPOK)
 976                 NetStartAgain();
 977         else
 978                 NetState = NETLOOP_SUCCESS;
 979 }
 980
 981 static void
 982 CDPDummyHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
 983 {
 984         /* nothing */
 985 }
 986
 987 static void
 988 CDPHandler(const uchar * pkt, unsigned len)
 989 {
 990         const uchar *t;
 991         const ushort *ss;
 992         ushort type, tlen;
 993         uchar applid;
 994         ushort vlan, nvlan;
 995
 996         /* minimum size? */
 997         if (len < sizeof(CDP_SNAP_hdr) + 4)
 998                 goto pkt_short;
 999
1000         /* check for valid CDP SNAP header */
1001         if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0)
1002                 return;
1003
1004         pkt += sizeof(CDP_SNAP_hdr);
1005         len -= sizeof(CDP_SNAP_hdr);
1006
1007         /* Version of CDP protocol must be >= 2 and TTL != 0 */
1008         if (pkt[0] < 0x02 || pkt[1] == 0)
1009                 return;
1010
1011         /* if version is greater than 0x02 maybe we'll have a problem; output a warning */
1012         if (pkt[0] != 0x02)
1013                 printf("** WARNING: CDP packet received with a protocol version %d > 2\n",
1014                                 pkt[0] & 0xff);
1015
1016         if (CDP_compute_csum(pkt, len) != 0)
1017                 return;
1018
1019         pkt += 4;
1020         len -= 4;
1021
1022         vlan = htons(-1);
1023         nvlan = htons(-1);
1024         while (len > 0) {
1025                 if (len < 4)
1026                         goto pkt_short;
1027
1028                 ss = (const ushort *)pkt;
1029                 type = ntohs(ss[0]);
1030                 tlen = ntohs(ss[1]);
1031                 if (tlen > len) {
1032                         goto pkt_short;
1033                 }
1034
1035                 pkt += tlen;
1036                 len -= tlen;
1037
1038                 ss += 2;        /* point ss to the data of the TLV */
1039                 tlen -= 4;
1040
1041                 switch (type) {
1042                         case CDP_DEVICE_ID_TLV:
1043                                 break;
1044                         case CDP_ADDRESS_TLV:
1045                                 break;
1046                         case CDP_PORT_ID_TLV:
1047                                 break;
1048                         case CDP_CAPABILITIES_TLV:
1049                                 break;
1050                         case CDP_VERSION_TLV:
1051                                 break;
1052                         case CDP_PLATFORM_TLV:
1053                                 break;
1054                         case CDP_NATIVE_VLAN_TLV:
1055                                 nvlan = *ss;
1056                                 break;
1057                         case CDP_APPLIANCE_VLAN_TLV:
1058                                 t = (const uchar *)ss;
1059                                 while (tlen > 0) {
1060                                         if (tlen < 3)
1061                                                 goto pkt_short;
1062
1063                                         applid = t[0];
1064                                         ss = (const ushort *)(t + 1);
1065
1066 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE
1067                                         if (applid == CONFIG_CDP_APPLIANCE_VLAN_TYPE)
1068                                                 vlan = *ss;
1069 #else
1070                                         vlan = ntohs(*ss);      /* XXX will this work; dunno */
1071 #endif
1072                                         t += 3; tlen -= 3;
1073                                 }
1074                                 break;
1075                         case CDP_TRIGGER_TLV:
1076                                 break;
1077                         case CDP_POWER_CONSUMPTION_TLV:
1078                                 break;
1079                         case CDP_SYSNAME_TLV:
1080                                 break;
1081                         case CDP_SYSOBJECT_TLV:
1082                                 break;
1083                         case CDP_MANAGEMENT_ADDRESS_TLV:
1084                                 break;
1085                 }
1086         }
1087
1088         CDPApplianceVLAN = vlan;
1089         CDPNativeVLAN = nvlan;
1090
1091         CDPOK = 1;
1092         return;
1093
1094  pkt_short:
1095         printf("** CDP packet is too short\n");
1096         return;
1097 }
1098
1099 static void CDPStart(void)
1100 {
1101 #if defined(CONFIG_NET_MULTI)
1102         printf ("Using %s device\n", eth_get_name());
1103 #endif
1104         CDPSeq = 0;
1105         CDPOK = 0;
1106
1107         CDPNativeVLAN = htons(-1);
1108         CDPApplianceVLAN = htons(-1);
1109
1110         NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
1111         NetSetHandler (CDPDummyHandler);
1112
1113         CDPSendTrigger();
1114 }
1115 #endif
1116
1117
1118 void
1119 NetReceive(volatile uchar * inpkt, int len)
1120 {
1121         Ethernet_t *et;
1122         IP_t    *ip;
1123         ARP_t   *arp;
1124         IPaddr_t tmp;
1125         int     x;
1126         uchar *pkt;
1127 #if defined(CONFIG_CMD_CDP)
1128         int iscdp;
1129 #endif
1130         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1131
1132 #ifdef ET_DEBUG
1133         printf("packet received\n");
1134 #endif
1135
1136         NetRxPacket = inpkt;
1137         NetRxPacketLen = len;
1138         et = (Ethernet_t *)inpkt;
1139
1140         /* too small packet? */
1141         if (len < ETHER_HDR_SIZE)
1142                 return;
1143
1144 #ifdef CONFIG_API
1145         if (push_packet) {
1146                 (*push_packet)(inpkt, len);
1147                 return;
1148         }
1149 #endif
1150
1151 #if defined(CONFIG_CMD_CDP)
1152         /* keep track if packet is CDP */
1153         iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0;
1154 #endif
1155
1156         myvlanid = ntohs(NetOurVLAN);
1157         if (myvlanid == (ushort)-1)
1158                 myvlanid = VLAN_NONE;
1159         mynvlanid = ntohs(NetOurNativeVLAN);
1160         if (mynvlanid == (ushort)-1)
1161                 mynvlanid = VLAN_NONE;
1162
1163         x = ntohs(et->et_protlen);
1164
1165 #ifdef ET_DEBUG
1166         printf("packet received\n");
1167 #endif
1168
1169         if (x < 1514) {
1170                 /*
1171                  *      Got a 802 packet.  Check the other protocol field.
1172                  */
1173                 x = ntohs(et->et_prot);
1174
1175                 ip = (IP_t *)(inpkt + E802_HDR_SIZE);
1176                 len -= E802_HDR_SIZE;
1177
1178         } else if (x != PROT_VLAN) {    /* normal packet */
1179                 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE);
1180                 len -= ETHER_HDR_SIZE;
1181
1182         } else {                        /* VLAN packet */
1183                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et;
1184
1185 #ifdef ET_DEBUG
1186                 printf("VLAN packet received\n");
1187 #endif
1188                 /* too small packet? */
1189                 if (len < VLAN_ETHER_HDR_SIZE)
1190                         return;
1191
1192                 /* if no VLAN active */
1193                 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
1194 #if defined(CONFIG_CMD_CDP)
1195                                 && iscdp == 0
1196 #endif
1197                                 )
1198                         return;
1199
1200                 cti = ntohs(vet->vet_tag);
1201                 vlanid = cti & VLAN_IDMASK;
1202                 x = ntohs(vet->vet_type);
1203
1204                 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE);
1205                 len -= VLAN_ETHER_HDR_SIZE;
1206         }
1207
1208 #ifdef ET_DEBUG
1209         printf("Receive from protocol 0x%x\n", x);
1210 #endif
1211
1212 #if defined(CONFIG_CMD_CDP)
1213         if (iscdp) {
1214                 CDPHandler((uchar *)ip, len);
1215                 return;
1216         }
1217 #endif
1218
1219         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1220                 if (vlanid == VLAN_NONE)
1221                         vlanid = (mynvlanid & VLAN_IDMASK);
1222                 /* not matched? */
1223                 if (vlanid != (myvlanid & VLAN_IDMASK))
1224                         return;
1225         }
1226
1227         switch (x) {
1228
1229         case PROT_ARP:
1230                 /*
1231                  * We have to deal with two types of ARP packets:
1232                  * - REQUEST packets will be answered by sending  our
1233                  *   IP address - if we know it.
1234                  * - REPLY packates are expected only after we asked
1235                  *   for the TFTP server's or the gateway's ethernet
1236                  *   address; so if we receive such a packet, we set
1237                  *   the server ethernet address
1238                  */
1239 #ifdef ET_DEBUG
1240                 puts ("Got ARP\n");
1241 #endif
1242                 arp = (ARP_t *)ip;
1243                 if (len < ARP_HDR_SIZE) {
1244                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1245                         return;
1246                 }
1247                 if (ntohs(arp->ar_hrd) != ARP_ETHER) {
1248                         return;
1249                 }
1250                 if (ntohs(arp->ar_pro) != PROT_IP) {
1251                         return;
1252                 }
1253                 if (arp->ar_hln != 6) {
1254                         return;
1255                 }
1256                 if (arp->ar_pln != 4) {
1257                         return;
1258                 }
1259
1260                 if (NetOurIP == 0) {
1261                         return;
1262                 }
1263
1264                 if (NetReadIP(&arp->ar_data[16]) != NetOurIP) {
1265                         return;
1266                 }
1267
1268                 switch (ntohs(arp->ar_op)) {
1269                 case ARPOP_REQUEST:             /* reply with our IP address    */
1270 #ifdef ET_DEBUG
1271                         puts ("Got ARP REQUEST, return our IP\n");
1272 #endif
1273                         pkt = (uchar *)et;
1274                         pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
1275                         arp->ar_op = htons(ARPOP_REPLY);
1276                         memcpy   (&arp->ar_data[10], &arp->ar_data[0], 6);
1277                         NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
1278                         memcpy   (&arp->ar_data[ 0], NetOurEther, 6);
1279                         NetCopyIP(&arp->ar_data[ 6], &NetOurIP);
1280                         (void) eth_send((uchar *)et, (pkt - (uchar *)et) + ARP_HDR_SIZE);
1281                         return;
1282
1283                 case ARPOP_REPLY:               /* arp reply */
1284                         /* are we waiting for a reply */
1285                         if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
1286                                 break;
1287 #ifdef ET_DEBUG
1288                         printf("Got ARP REPLY, set server/gtwy eth addr (%pM)\n",
1289                                 arp->ar_data);
1290 #endif
1291
1292                         tmp = NetReadIP(&arp->ar_data[6]);
1293
1294                         /* matched waiting packet's address */
1295                         if (tmp == NetArpWaitReplyIP) {
1296 #ifdef ET_DEBUG
1297                                 puts ("Got it\n");
1298 #endif
1299                                 /* save address for later use */
1300                                 memcpy(NetArpWaitPacketMAC, &arp->ar_data[0], 6);
1301
1302 #ifdef CONFIG_NETCONSOLE
1303                                 (*packetHandler)(0,0,0,0);
1304 #endif
1305                                 /* modify header, and transmit it */
1306                                 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6);
1307                                 (void) eth_send(NetArpWaitTxPacket, NetArpWaitTxPacketSize);
1308
1309                                 /* no arp request pending now */
1310                                 NetArpWaitPacketIP = 0;
1311                                 NetArpWaitTxPacketSize = 0;
1312                                 NetArpWaitPacketMAC = NULL;
1313
1314                         }
1315                         return;
1316                 default:
1317 #ifdef ET_DEBUG
1318                         printf("Unexpected ARP opcode 0x%x\n", ntohs(arp->ar_op));
1319 #endif
1320                         return;
1321                 }
1322                 break;
1323
1324         case PROT_RARP:
1325 #ifdef ET_DEBUG
1326                 puts ("Got RARP\n");
1327 #endif
1328                 arp = (ARP_t *)ip;
1329                 if (len < ARP_HDR_SIZE) {
1330                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1331                         return;
1332                 }
1333
1334                 if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
1335                         (ntohs(arp->ar_hrd) != ARP_ETHER)   ||
1336                         (ntohs(arp->ar_pro) != PROT_IP)     ||
1337                         (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
1338
1339                         puts ("invalid RARP header\n");
1340                 } else {
1341                         NetCopyIP(&NetOurIP,    &arp->ar_data[16]);
1342                         if (NetServerIP == 0)
1343                                 NetCopyIP(&NetServerIP, &arp->ar_data[ 6]);
1344                         memcpy (NetServerEther, &arp->ar_data[ 0], 6);
1345
1346                         (*packetHandler)(0,0,0,0);
1347                 }
1348                 break;
1349
1350         case PROT_IP:
1351 #ifdef ET_DEBUG
1352                 puts ("Got IP\n");
1353 #endif
1354                 if (len < IP_HDR_SIZE) {
1355                         debug ("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE);
1356                         return;
1357                 }
1358                 if (len < ntohs(ip->ip_len)) {
1359                         printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
1360                         return;
1361                 }
1362                 len = ntohs(ip->ip_len);
1363 #ifdef ET_DEBUG
1364                 printf("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
1365 #endif
1366                 if ((ip->ip_hl_v & 0xf0) != 0x40) {
1367                         return;
1368                 }
1369                 /* Can't deal with fragments */
1370                 if (ip->ip_off & htons(IP_OFFS | IP_FLAGS_MFRAG)) {
1371                         return;
1372                 }
1373                 /* can't deal with headers > 20 bytes */
1374                 if ((ip->ip_hl_v & 0x0f) > 0x05) {
1375                         return;
1376                 }
1377                 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
1378                         puts ("checksum bad\n");
1379                         return;
1380                 }
1381                 tmp = NetReadIP(&ip->ip_dst);
1382                 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
1383 #ifdef CONFIG_MCAST_TFTP
1384                         if (Mcast_addr != tmp)
1385 #endif
1386                         return;
1387                 }
1388                 /*
1389                  * watch for ICMP host redirects
1390                  *
1391                  * There is no real handler code (yet). We just watch
1392                  * for ICMP host redirect messages. In case anybody
1393                  * sees these messages: please contact me
1394                  * (wd@denx.de), or - even better - send me the
1395                  * necessary fixes :-)
1396                  *
1397                  * Note: in all cases where I have seen this so far
1398                  * it was a problem with the router configuration,
1399                  * for instance when a router was configured in the
1400                  * BOOTP reply, but the TFTP server was on the same
1401                  * subnet. So this is probably a warning that your
1402                  * configuration might be wrong. But I'm not really
1403                  * sure if there aren't any other situations.
1404                  */
1405                 if (ip->ip_p == IPPROTO_ICMP) {
1406                         ICMP_t *icmph = (ICMP_t *)&(ip->udp_src);
1407
1408                         switch (icmph->type) {
1409                         case ICMP_REDIRECT:
1410                                 if (icmph->code != ICMP_REDIR_HOST)
1411                                         return;
1412                                 printf (" ICMP Host Redirect to %pI4 ", &icmph->un.gateway);
1413                                 return;
1414 #if defined(CONFIG_CMD_PING)
1415                         case ICMP_ECHO_REPLY:
1416                                 /*
1417                                  *      IP header OK.  Pass the packet to the current handler.
1418                                  */
1419                                 /* XXX point to ip packet */
1420                                 (*packetHandler)((uchar *)ip, 0, 0, 0);
1421                                 return;
1422                         case ICMP_ECHO_REQUEST:
1423 #ifdef ET_DEBUG
1424                                 printf ("Got ICMP ECHO REQUEST, return %d bytes \n",
1425                                         ETHER_HDR_SIZE + len);
1426 #endif
1427                                 memcpy (&et->et_dest[0], &et->et_src[0], 6);
1428                                 memcpy (&et->et_src[ 0], NetOurEther, 6);
1429
1430                                 ip->ip_sum = 0;
1431                                 ip->ip_off = 0;
1432                                 NetCopyIP((void*)&ip->ip_dst, &ip->ip_src);
1433                                 NetCopyIP((void*)&ip->ip_src, &NetOurIP);
1434                                 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP >> 1);
1435
1436                                 icmph->type = ICMP_ECHO_REPLY;
1437                                 icmph->checksum = 0;
1438                                 icmph->checksum = ~NetCksum((uchar *)icmph,
1439                                                 (len - IP_HDR_SIZE_NO_UDP) >> 1);
1440                                 (void) eth_send((uchar *)et, ETHER_HDR_SIZE + len);
1441                                 return;
1442 #endif
1443                         default:
1444                                 return;
1445                         }
1446                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1447                         return;
1448                 }
1449
1450 #ifdef CONFIG_UDP_CHECKSUM
1451                 if (ip->udp_xsum != 0) {
1452                         ulong   xsum;
1453                         ushort *sumptr;
1454                         ushort  sumlen;
1455
1456                         xsum  = ip->ip_p;
1457                         xsum += (ntohs(ip->udp_len));
1458                         xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
1459                         xsum += (ntohl(ip->ip_src) >>  0) & 0x0000ffff;
1460                         xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
1461                         xsum += (ntohl(ip->ip_dst) >>  0) & 0x0000ffff;
1462
1463                         sumlen = ntohs(ip->udp_len);
1464                         sumptr = (ushort *) &(ip->udp_src);
1465
1466                         while (sumlen > 1) {
1467                                 ushort sumdata;
1468
1469                                 sumdata = *sumptr++;
1470                                 xsum += ntohs(sumdata);
1471                                 sumlen -= 2;
1472                         }
1473                         if (sumlen > 0) {
1474                                 ushort sumdata;
1475
1476                                 sumdata = *(unsigned char *) sumptr;
1477                                 sumdata = (sumdata << 8) & 0xff00;
1478                                 xsum += sumdata;
1479                         }
1480                         while ((xsum >> 16) != 0) {
1481                                 xsum = (xsum & 0x0000ffff) + ((xsum >> 16) & 0x0000ffff);
1482                         }
1483                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1484                                 printf(" UDP wrong checksum %08lx %08x\n",
1485                                         xsum, ntohs(ip->udp_xsum));
1486                                 return;
1487                         }
1488                 }
1489 #endif
1490
1491
1492 #ifdef CONFIG_NETCONSOLE
1493                 nc_input_packet((uchar *)ip +IP_HDR_SIZE,
1494                                                 ntohs(ip->udp_dst),
1495                                                 ntohs(ip->udp_src),
1496                                                 ntohs(ip->udp_len) - 8);
1497 #endif
1498                 /*
1499                  *      IP header OK.  Pass the packet to the current handler.
1500                  */
1501                 (*packetHandler)((uchar *)ip +IP_HDR_SIZE,
1502                                                 ntohs(ip->udp_dst),
1503                                                 ntohs(ip->udp_src),
1504                                                 ntohs(ip->udp_len) - 8);
1505                 break;
1506         }
1507 }
1508
1509
1510 /**********************************************************************/
1511
1512 static int net_check_prereq (proto_t protocol)
1513 {
1514         switch (protocol) {
1515                 /* Fall through */
1516 #if defined(CONFIG_CMD_PING)
1517         case PING:
1518                 if (NetPingIP == 0) {
1519                         puts ("*** ERROR: ping address not given\n");
1520                         return (1);
1521                 }
1522                 goto common;
1523 #endif
1524 #if defined(CONFIG_CMD_SNTP)
1525         case SNTP:
1526                 if (NetNtpServerIP == 0) {
1527                         puts ("*** ERROR: NTP server address not given\n");
1528                         return (1);
1529                 }
1530                 goto common;
1531 #endif
1532 #if defined(CONFIG_CMD_DNS)
1533         case DNS:
1534                 if (NetOurDNSIP == 0) {
1535                         puts("*** ERROR: DNS server address not given\n");
1536                         return 1;
1537                 }
1538                 goto common;
1539 #endif
1540 #if defined(CONFIG_CMD_NFS)
1541         case NFS:
1542 #endif
1543         case NETCONS:
1544         case TFTP:
1545                 if (NetServerIP == 0) {
1546                         puts ("*** ERROR: `serverip' not set\n");
1547                         return (1);
1548                 }
1549 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP)
1550     common:
1551 #endif
1552
1553                 if (NetOurIP == 0) {
1554                         puts ("*** ERROR: `ipaddr' not set\n");
1555                         return (1);
1556                 }
1557                 /* Fall through */
1558
1559         case DHCP:
1560         case RARP:
1561         case BOOTP:
1562         case CDP:
1563                 if (memcmp (NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
1564 #ifdef CONFIG_NET_MULTI
1565                         extern int eth_get_dev_index (void);
1566                         int num = eth_get_dev_index ();
1567
1568                         switch (num) {
1569                         case -1:
1570                                 puts ("*** ERROR: No ethernet found.\n");
1571                                 return (1);
1572                         case 0:
1573                                 puts ("*** ERROR: `ethaddr' not set\n");
1574                                 break;
1575                         default:
1576                                 printf ("*** ERROR: `eth%daddr' not set\n",
1577                                         num);
1578                                 break;
1579                         }
1580
1581                         NetStartAgain ();
1582                         return (2);
1583 #else
1584                         puts ("*** ERROR: `ethaddr' not set\n");
1585                         return (1);
1586 #endif
1587                 }
1588                 /* Fall through */
1589         default:
1590                 return (0);
1591         }
1592         return (0);             /* OK */
1593 }
1594 /**********************************************************************/
1595
1596 int
1597 NetCksumOk(uchar * ptr, int len)
1598 {
1599         return !((NetCksum(ptr, len) + 1) & 0xfffe);
1600 }
1601
1602
1603 unsigned
1604 NetCksum(uchar * ptr, int len)
1605 {
1606         ulong   xsum;
1607         ushort *p = (ushort *)ptr;
1608
1609         xsum = 0;
1610         while (len-- > 0)
1611                 xsum += *p++;
1612         xsum = (xsum & 0xffff) + (xsum >> 16);
1613         xsum = (xsum & 0xffff) + (xsum >> 16);
1614         return (xsum & 0xffff);
1615 }
1616
1617 int
1618 NetEthHdrSize(void)
1619 {
1620         ushort myvlanid;
1621
1622         myvlanid = ntohs(NetOurVLAN);
1623         if (myvlanid == (ushort)-1)
1624                 myvlanid = VLAN_NONE;
1625
1626         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : VLAN_ETHER_HDR_SIZE;
1627 }
1628
1629 int
1630 NetSetEther(volatile uchar * xet, uchar * addr, uint prot)
1631 {
1632         Ethernet_t *et = (Ethernet_t *)xet;
1633         ushort myvlanid;
1634
1635         myvlanid = ntohs(NetOurVLAN);
1636         if (myvlanid == (ushort)-1)
1637                 myvlanid = VLAN_NONE;
1638
1639         memcpy (et->et_dest, addr, 6);
1640         memcpy (et->et_src, NetOurEther, 6);
1641         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1642         et->et_protlen = htons(prot);
1643                 return ETHER_HDR_SIZE;
1644         } else {
1645                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet;
1646
1647                 vet->vet_vlan_type = htons(PROT_VLAN);
1648                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1649                 vet->vet_type = htons(prot);
1650                 return VLAN_ETHER_HDR_SIZE;
1651         }
1652 }
1653
1654 void
1655 NetSetIP(volatile uchar * xip, IPaddr_t dest, int dport, int sport, int len)
1656 {
1657         IP_t *ip = (IP_t *)xip;
1658
1659         /*
1660          *      If the data is an odd number of bytes, zero the
1661          *      byte after the last byte so that the checksum
1662          *      will work.
1663          */
1664         if (len & 1)
1665                 xip[IP_HDR_SIZE + len] = 0;
1666
1667         /*
1668          *      Construct an IP and UDP header.
1669          *      (need to set no fragment bit - XXX)
1670          */
1671         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
1672         ip->ip_tos   = 0;
1673         ip->ip_len   = htons(IP_HDR_SIZE + len);
1674         ip->ip_id    = htons(NetIPID++);
1675         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1676         ip->ip_ttl   = 255;
1677         ip->ip_p     = 17;              /* UDP */
1678         ip->ip_sum   = 0;
1679         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
1680         NetCopyIP((void*)&ip->ip_dst, &dest);      /* - "" - */
1681         ip->udp_src  = htons(sport);
1682         ip->udp_dst  = htons(dport);
1683         ip->udp_len  = htons(8 + len);
1684         ip->udp_xsum = 0;
1685         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
1686 }
1687
1688 void copy_filename (char *dst, char *src, int size)
1689 {
1690         if (*src && (*src == '"')) {
1691                 ++src;
1692                 --size;
1693         }
1694
1695         while ((--size > 0) && *src && (*src != '"')) {
1696                 *dst++ = *src++;
1697         }
1698         *dst = '\0';
1699 }
1700
1701 #endif
1702
1703 #if defined(CONFIG_CMD_NFS) || defined(CONFIG_CMD_SNTP) || defined(CONFIG_CMD_DNS)
1704 /*
1705  * make port a little random, but use something trivial to compute
1706  */
1707 unsigned int random_port(void)
1708 {
1709         return 1024 + (get_timer(0) % 0x8000);;
1710 }
1711 #endif
1712
1713 void ip_to_string (IPaddr_t x, char *s)
1714 {
1715         x = ntohl (x);
1716         sprintf (s, "%d.%d.%d.%d",
1717                  (int) ((x >> 24) & 0xff),
1718                  (int) ((x >> 16) & 0xff),
1719                  (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
1720         );
1721 }
1722
1723 IPaddr_t string_to_ip(char *s)
1724 {
1725         IPaddr_t addr;
1726         char *e;
1727         int i;
1728
1729         if (s == NULL)
1730                 return(0);
1731
1732         for (addr=0, i=0; i<4; ++i) {
1733                 ulong val = s ? simple_strtoul(s, &e, 10) : 0;
1734                 addr <<= 8;
1735                 addr |= (val & 0xFF);
1736                 if (s) {
1737                         s = (*e) ? e+1 : e;
1738                 }
1739         }
1740
1741         return (htonl(addr));
1742 }
1743
1744 void VLAN_to_string(ushort x, char *s)
1745 {
1746         x = ntohs(x);
1747
1748         if (x == (ushort)-1)
1749                 x = VLAN_NONE;
1750
1751         if (x == VLAN_NONE)
1752                 strcpy(s, "none");
1753         else
1754                 sprintf(s, "%d", x & VLAN_IDMASK);
1755 }
1756
1757 ushort string_to_VLAN(char *s)
1758 {
1759         ushort id;
1760
1761         if (s == NULL)
1762                 return htons(VLAN_NONE);
1763
1764         if (*s < '0' || *s > '9')
1765                 id = VLAN_NONE;
1766         else
1767                 id = (ushort)simple_strtoul(s, NULL, 10);
1768
1769         return htons(id);
1770 }
1771
1772 IPaddr_t getenv_IPaddr (char *var)
1773 {
1774         return (string_to_ip(getenv(var)));
1775 }
1776
1777 ushort getenv_VLAN(char *var)
1778 {
1779         return (string_to_VLAN(getenv(var)));
1780 }