net/net.c

   1 /*
   2  *      Copied from Linux Monitor (LiMon) - Networking.
   3  *
   4  *      Copyright 1994 - 2000 Neil Russell.
   5  *      (See License)
   6  *      Copyright 2000 Roland Borde
   7  *      Copyright 2000 Paolo Scaffardi
   8  *      Copyright 2000-2002 Wolfgang Denk, wd@denx.de
   9  */
  10
  11 /*
  12  * General Desription:
  13  *
  14  * The user interface supports commands for BOOTP, RARP, and TFTP.
  15  * Also, we support ARP internally. Depending on available data,
  16  * these interact as follows:
  17  *
  18  * BOOTP:
  19  *
  20  *      Prerequisites:  - own ethernet address
  21  *      We want:        - own IP address
  22  *                      - TFTP server IP address
  23  *                      - name of bootfile
  24  *      Next step:      ARP
  25  *
  26  * RARP:
  27  *
  28  *      Prerequisites:  - own ethernet address
  29  *      We want:        - own IP address
  30  *                      - TFTP server IP address
  31  *      Next step:      ARP
  32  *
  33  * ARP:
  34  *
  35  *      Prerequisites:  - own ethernet address
  36  *                      - own IP address
  37  *                      - TFTP server IP address
  38  *      We want:        - TFTP server ethernet address
  39  *      Next step:      TFTP
  40  *
  41  * DHCP:
  42  *
  43  *     Prerequisites:   - own ethernet address
  44  *     We want:         - IP, Netmask, ServerIP, Gateway IP
  45  *                      - bootfilename, lease time
  46  *     Next step:       - TFTP
  47  *
  48  * TFTP:
  49  *
  50  *      Prerequisites:  - own ethernet address
  51  *                      - own IP address
  52  *                      - TFTP server IP address
  53  *                      - TFTP server ethernet address
  54  *                      - name of bootfile (if unknown, we use a default name
  55  *                        derived from our own IP address)
  56  *      We want:        - load the boot file
  57  *      Next step:      none
  58  *
  59  * NFS:
  60  *
  61  *      Prerequisites:  - own ethernet address
  62  *                      - own IP address
  63  *                      - name of bootfile (if unknown, we use a default name
  64  *                        derived from our own IP address)
  65  *      We want:        - load the boot file
  66  *      Next step:      none
  67  *
  68  * SNTP:
  69  *
  70  *      Prerequisites:  - own ethernet address
  71  *                      - own IP address
  72  *      We want:        - network time
  73  *      Next step:      none
  74  */
  75
  76
  77 #include <common.h>
  78 #include <watchdog.h>
  79 #include <command.h>
  80 #include <net.h>
  81 #include "bootp.h"
  82 #include "tftp.h"
  83 #include "rarp.h"
  84 #include "nfs.h"
  85 #ifdef CONFIG_STATUS_LED
  86 #include <status_led.h>
  87 #include <miiphy.h>
  88 #endif
  89 #if defined(CONFIG_CMD_SNTP)
  90 #include "sntp.h"
  91 #endif
  92
  93 #if defined(CONFIG_CMD_NET)
  94
  95 DECLARE_GLOBAL_DATA_PTR;
  96
  97 #define ARP_TIMEOUT             5UL             /* Seconds before trying ARP again */
  98 #ifndef CONFIG_NET_RETRY_COUNT
  99 # define ARP_TIMEOUT_COUNT      5               /* # of timeouts before giving up  */
 100 #else
 101 # define ARP_TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT)
 102 #endif
 103
 104 #if 0
 105 #define ET_DEBUG
 106 #endif
 107
 108 /** BOOTP EXTENTIONS **/
 109
 110 IPaddr_t        NetOurSubnetMask=0;             /* Our subnet mask (0=unknown)  */
 111 IPaddr_t        NetOurGatewayIP=0;              /* Our gateways IP address      */
 112 IPaddr_t        NetOurDNSIP=0;                  /* Our DNS IP address           */
 113 #if defined(CONFIG_BOOTP_DNS2)
 114 IPaddr_t        NetOurDNS2IP=0;                 /* Our 2nd DNS IP address       */
 115 #endif
 116 char            NetOurNISDomain[32]={0,};       /* Our NIS domain               */
 117 char            NetOurHostName[32]={0,};        /* Our hostname                 */
 118 char            NetOurRootPath[64]={0,};        /* Our bootpath                 */
 119 ushort          NetBootFileSize=0;              /* Our bootfile size in blocks  */
 120
 121 #ifdef CONFIG_MCAST_TFTP        /* Multicast TFTP */
 122 IPaddr_t Mcast_addr;
 123 #endif
 124
 125 /** END OF BOOTP EXTENTIONS **/
 126
 127 ulong           NetBootFileXferSize;    /* The actual transferred size of the bootfile (in bytes) */
 128 uchar           NetOurEther[6];         /* Our ethernet address                 */
 129 uchar           NetServerEther[6] =     /* Boot server enet address             */
 130                         { 0, 0, 0, 0, 0, 0 };
 131 IPaddr_t        NetOurIP;               /* Our IP addr (0 = unknown)            */
 132 IPaddr_t        NetServerIP;            /* Our IP addr (0 = unknown)            */
 133 volatile uchar *NetRxPkt;               /* Current receive packet               */
 134 int             NetRxPktLen;            /* Current rx packet length             */
 135 unsigned        NetIPID;                /* IP packet ID                         */
 136 uchar           NetBcastAddr[6] =       /* Ethernet bcast address               */
 137                         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 138 uchar           NetEtherNullAddr[6] =
 139                         { 0, 0, 0, 0, 0, 0 };
 140 #ifdef CONFIG_API
 141 void            (*push_packet)(volatile void *, int len) = 0;
 142 #endif
 143 #if defined(CONFIG_CMD_CDP)
 144 uchar           NetCDPAddr[6] =         /* Ethernet bcast address               */
 145                         { 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc };
 146 #endif
 147 int             NetState;               /* Network loop state                   */
 148 #ifdef CONFIG_NET_MULTI
 149 int             NetRestartWrap = 0;     /* Tried all network devices            */
 150 static int      NetRestarted = 0;       /* Network loop restarted               */
 151 static int      NetDevExists = 0;       /* At least one device configured       */
 152 #endif
 153
 154 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
 155 ushort          NetOurVLAN = 0xFFFF;            /* default is without VLAN      */
 156 ushort          NetOurNativeVLAN = 0xFFFF;      /* ditto                        */
 157
 158 char            BootFile[128];          /* Boot File name                       */
 159
 160 #if defined(CONFIG_CMD_PING)
 161 IPaddr_t        NetPingIP;              /* the ip address to ping               */
 162
 163 static void PingStart(void);
 164 #endif
 165
 166 #if defined(CONFIG_CMD_CDP)
 167 static void CDPStart(void);
 168 #endif
 169
 170 #if defined(CONFIG_CMD_SNTP)
 171 IPaddr_t        NetNtpServerIP;         /* NTP server IP address                */
 172 int             NetTimeOffset=0;        /* offset time from UTC                 */
 173 #endif
 174
 175 #ifdef CONFIG_NETCONSOLE
 176 void NcStart(void);
 177 int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len);
 178 #endif
 179
 180 volatile uchar  PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 181
 182 volatile uchar *NetRxPackets[PKTBUFSRX]; /* Receive packets                     */
 183
 184 static rxhand_f *packetHandler;         /* Current RX packet handler            */
 185 static thand_f *timeHandler;            /* Current timeout handler              */
 186 static ulong    timeStart;              /* Time base value                      */
 187 static ulong    timeDelta;              /* Current timeout value                */
 188 volatile uchar *NetTxPacket = 0;        /* THE transmit packet                  */
 189
 190 static int net_check_prereq (proto_t protocol);
 191
 192 /**********************************************************************/
 193
 194 IPaddr_t        NetArpWaitPacketIP;
 195 IPaddr_t        NetArpWaitReplyIP;
 196 uchar          *NetArpWaitPacketMAC;    /* MAC address of waiting packet's destination  */
 197 uchar          *NetArpWaitTxPacket;     /* THE transmit packet                  */
 198 int             NetArpWaitTxPacketSize;
 199 uchar           NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
 200 ulong           NetArpWaitTimerStart;
 201 int             NetArpWaitTry;
 202
 203 void ArpRequest (void)
 204 {
 205         int i;
 206         volatile uchar *pkt;
 207         ARP_t *arp;
 208
 209 #ifdef ET_DEBUG
 210         printf ("ARP broadcast %d\n", NetArpWaitTry);
 211 #endif
 212         pkt = NetTxPacket;
 213
 214         pkt += NetSetEther (pkt, NetBcastAddr, PROT_ARP);
 215
 216         arp = (ARP_t *) pkt;
 217
 218         arp->ar_hrd = htons (ARP_ETHER);
 219         arp->ar_pro = htons (PROT_IP);
 220         arp->ar_hln = 6;
 221         arp->ar_pln = 4;
 222         arp->ar_op = htons (ARPOP_REQUEST);
 223
 224         memcpy (&arp->ar_data[0], NetOurEther, 6);              /* source ET addr       */
 225         NetWriteIP ((uchar *) & arp->ar_data[6], NetOurIP);     /* source IP addr       */
 226         for (i = 10; i < 16; ++i) {
 227                 arp->ar_data[i] = 0;                            /* dest ET addr = 0     */
 228         }
 229
 230         if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
 231             (NetOurIP & NetOurSubnetMask)) {
 232                 if (NetOurGatewayIP == 0) {
 233                         puts ("## Warning: gatewayip needed but not set\n");
 234                         NetArpWaitReplyIP = NetArpWaitPacketIP;
 235                 } else {
 236                         NetArpWaitReplyIP = NetOurGatewayIP;
 237                 }
 238         } else {
 239                 NetArpWaitReplyIP = NetArpWaitPacketIP;
 240         }
 241
 242         NetWriteIP ((uchar *) & arp->ar_data[16], NetArpWaitReplyIP);
 243         (void) eth_send (NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
 244 }
 245
 246 void ArpTimeoutCheck(void)
 247 {
 248         ulong t;
 249
 250         if (!NetArpWaitPacketIP)
 251                 return;
 252
 253         t = get_timer(0);
 254
 255         /* check for arp timeout */
 256         if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT * CFG_HZ) {
 257                 NetArpWaitTry++;
 258
 259                 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
 260                         puts ("\nARP Retry count exceeded; starting again\n");
 261                         NetArpWaitTry = 0;
 262                         NetStartAgain();
 263                 } else {
 264                         NetArpWaitTimerStart = t;
 265                         ArpRequest();
 266                 }
 267         }
 268 }
 269
 270 /**********************************************************************/
 271 /*
 272  *      Main network processing loop.
 273  */
 274
 275 int
 276 NetLoop(proto_t protocol)
 277 {
 278         bd_t *bd = gd->bd;
 279
 280 #ifdef CONFIG_NET_MULTI
 281         NetRestarted = 0;
 282         NetDevExists = 0;
 283 #endif
 284
 285         /* XXX problem with bss workaround */
 286         NetArpWaitPacketMAC = NULL;
 287         NetArpWaitTxPacket = NULL;
 288         NetArpWaitPacketIP = 0;
 289         NetArpWaitReplyIP = 0;
 290         NetArpWaitTxPacket = NULL;
 291         NetTxPacket = NULL;
 292
 293         if (!NetTxPacket) {
 294                 int     i;
 295                 /*
 296                  *      Setup packet buffers, aligned correctly.
 297                  */
 298                 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
 299                 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
 300                 for (i = 0; i < PKTBUFSRX; i++) {
 301                         NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
 302                 }
 303         }
 304
 305         if (!NetArpWaitTxPacket) {
 306                 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
 307                 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
 308                 NetArpWaitTxPacketSize = 0;
 309         }
 310
 311         eth_halt();
 312 #ifdef CONFIG_NET_MULTI
 313         eth_set_current();
 314 #endif
 315         if (eth_init(bd) < 0) {
 316                 eth_halt();
 317                 return(-1);
 318         }
 319
 320 restart:
 321 #ifdef CONFIG_NET_MULTI
 322         memcpy (NetOurEther, eth_get_dev()->enetaddr, 6);
 323 #else
 324         memcpy (NetOurEther, bd->bi_enetaddr, 6);
 325 #endif
 326
 327         NetState = NETLOOP_CONTINUE;
 328
 329         /*
 330          *      Start the ball rolling with the given start function.  From
 331          *      here on, this code is a state machine driven by received
 332          *      packets and timer events.
 333          */
 334
 335         switch (protocol) {
 336 #if defined(CONFIG_CMD_NFS)
 337         case NFS:
 338 #endif
 339 #if defined(CONFIG_CMD_PING)
 340         case PING:
 341 #endif
 342 #if defined(CONFIG_CMD_SNTP)
 343         case SNTP:
 344 #endif
 345         case NETCONS:
 346         case TFTP:
 347                 NetCopyIP(&NetOurIP, &bd->bi_ip_addr);
 348                 NetOurGatewayIP = getenv_IPaddr ("gatewayip");
 349                 NetOurSubnetMask= getenv_IPaddr ("netmask");
 350                 NetOurVLAN = getenv_VLAN("vlan");
 351                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 352
 353                 switch (protocol) {
 354 #if defined(CONFIG_CMD_NFS)
 355                 case NFS:
 356 #endif
 357                 case NETCONS:
 358                 case TFTP:
 359                         NetServerIP = getenv_IPaddr ("serverip");
 360                         break;
 361 #if defined(CONFIG_CMD_PING)
 362                 case PING:
 363                         /* nothing */
 364                         break;
 365 #endif
 366 #if defined(CONFIG_CMD_SNTP)
 367                 case SNTP:
 368                         /* nothing */
 369                         break;
 370 #endif
 371                 default:
 372                         break;
 373                 }
 374
 375                 break;
 376         case BOOTP:
 377         case RARP:
 378                 /*
 379                  * initialize our IP addr to 0 in order to accept ANY
 380                  * IP addr assigned to us by the BOOTP / RARP server
 381                  */
 382                 NetOurIP = 0;
 383                 NetServerIP = getenv_IPaddr ("serverip");
 384                 NetOurVLAN = getenv_VLAN("vlan");       /* VLANs must be read */
 385                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 386         case CDP:
 387                 NetOurVLAN = getenv_VLAN("vlan");       /* VLANs must be read */
 388                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 389                 break;
 390         default:
 391                 break;
 392         }
 393
 394         switch (net_check_prereq (protocol)) {
 395         case 1:
 396                 /* network not configured */
 397                 eth_halt();
 398                 return (-1);
 399
 400 #ifdef CONFIG_NET_MULTI
 401         case 2:
 402                 /* network device not configured */
 403                 break;
 404 #endif /* CONFIG_NET_MULTI */
 405
 406         case 0:
 407 #ifdef CONFIG_NET_MULTI
 408                 NetDevExists = 1;
 409 #endif
 410                 switch (protocol) {
 411                 case TFTP:
 412                         /* always use ARP to get server ethernet address */
 413                         TftpStart();
 414                         break;
 415
 416 #if defined(CONFIG_CMD_DHCP)
 417                 case DHCP:
 418                         /* Start with a clean slate... */
 419                         BootpTry = 0;
 420                         NetOurIP = 0;
 421                         NetServerIP = getenv_IPaddr ("serverip");
 422                         DhcpRequest();          /* Basically same as BOOTP */
 423                         break;
 424 #endif
 425
 426                 case BOOTP:
 427                         BootpTry = 0;
 428                         BootpRequest ();
 429                         break;
 430
 431                 case RARP:
 432                         RarpTry = 0;
 433                         RarpRequest ();
 434                         break;
 435 #if defined(CONFIG_CMD_PING)
 436                 case PING:
 437                         PingStart();
 438                         break;
 439 #endif
 440 #if defined(CONFIG_CMD_NFS)
 441                 case NFS:
 442                         NfsStart();
 443                         break;
 444 #endif
 445 #if defined(CONFIG_CMD_CDP)
 446                 case CDP:
 447                         CDPStart();
 448                         break;
 449 #endif
 450 #ifdef CONFIG_NETCONSOLE
 451                 case NETCONS:
 452                         NcStart();
 453                         break;
 454 #endif
 455 #if defined(CONFIG_CMD_SNTP)
 456                 case SNTP:
 457                         SntpStart();
 458                         break;
 459 #endif
 460                 default:
 461                         break;
 462                 }
 463
 464                 NetBootFileXferSize = 0;
 465                 break;
 466         }
 467
 468 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 469 #if defined(CFG_FAULT_ECHO_LINK_DOWN) && defined(CONFIG_STATUS_LED) && defined(STATUS_LED_RED)
 470         /*
 471          * Echo the inverted link state to the fault LED.
 472          */
 473         if(miiphy_link(eth_get_dev()->name, CFG_FAULT_MII_ADDR)) {
 474                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 475         } else {
 476                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 477         }
 478 #endif /* CFG_FAULT_ECHO_LINK_DOWN, ... */
 479 #endif /* CONFIG_MII, ... */
 480
 481         /*
 482          *      Main packet reception loop.  Loop receiving packets until
 483          *      someone sets `NetState' to a state that terminates.
 484          */
 485         for (;;) {
 486                 WATCHDOG_RESET();
 487 #ifdef CONFIG_SHOW_ACTIVITY
 488                 {
 489                         extern void show_activity(int arg);
 490                         show_activity(1);
 491                 }
 492 #endif
 493                 /*
 494                  *      Check the ethernet for a new packet.  The ethernet
 495                  *      receive routine will process it.
 496                  */
 497                         eth_rx();
 498
 499                 /*
 500                  *      Abort if ctrl-c was pressed.
 501                  */
 502                 if (ctrlc()) {
 503                         eth_halt();
 504                         puts ("\nAbort\n");
 505                         return (-1);
 506                 }
 507
 508                 ArpTimeoutCheck();
 509
 510                 /*
 511                  *      Check for a timeout, and run the timeout handler
 512                  *      if we have one.
 513                  */
 514                 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
 515                         thand_f *x;
 516
 517 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 518 #  if defined(CFG_FAULT_ECHO_LINK_DOWN) && \
 519       defined(CONFIG_STATUS_LED) &&        \
 520       defined(STATUS_LED_RED)
 521                         /*
 522                          * Echo the inverted link state to the fault LED.
 523                          */
 524                         if(miiphy_link(eth_get_dev()->name, CFG_FAULT_MII_ADDR)) {
 525                                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 526                         } else {
 527                                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 528                         }
 529 #  endif /* CFG_FAULT_ECHO_LINK_DOWN, ... */
 530 #endif /* CONFIG_MII, ... */
 531                         x = timeHandler;
 532                         timeHandler = (thand_f *)0;
 533                         (*x)();
 534                 }
 535
 536
 537                 switch (NetState) {
 538
 539                 case NETLOOP_RESTART:
 540 #ifdef CONFIG_NET_MULTI
 541                         NetRestarted = 1;
 542 #endif
 543                         goto restart;
 544
 545                 case NETLOOP_SUCCESS:
 546                         if (NetBootFileXferSize > 0) {
 547                                 char buf[20];
 548                                 printf("Bytes transferred = %ld (%lx hex)\n",
 549                                         NetBootFileXferSize,
 550                                         NetBootFileXferSize);
 551                                 sprintf(buf, "%lX", NetBootFileXferSize);
 552                                 setenv("filesize", buf);
 553
 554                                 sprintf(buf, "%lX", (unsigned long)load_addr);
 555                                 setenv("fileaddr", buf);
 556                         }
 557                         eth_halt();
 558                         return NetBootFileXferSize;
 559
 560                 case NETLOOP_FAIL:
 561                         return (-1);
 562                 }
 563         }
 564 }
 565
 566 /**********************************************************************/
 567
 568 static void
 569 startAgainTimeout(void)
 570 {
 571         NetState = NETLOOP_RESTART;
 572 }
 573
 574 static void
 575 startAgainHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
 576 {
 577         /* Totally ignore the packet */
 578 }
 579
 580 void NetStartAgain (void)
 581 {
 582         char *nretry;
 583         int noretry = 0, once = 0;
 584
 585         if ((nretry = getenv ("netretry")) != NULL) {
 586                 noretry = (strcmp (nretry, "no") == 0);
 587                 once = (strcmp (nretry, "once") == 0);
 588         }
 589         if (noretry) {
 590                 eth_halt ();
 591                 NetState = NETLOOP_FAIL;
 592                 return;
 593         }
 594 #ifndef CONFIG_NET_MULTI
 595         NetSetTimeout (10UL * CFG_HZ, startAgainTimeout);
 596         NetSetHandler (startAgainHandler);
 597 #else   /* !CONFIG_NET_MULTI*/
 598         eth_halt ();
 599 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
 600         eth_try_another (!NetRestarted);
 601 #endif
 602         eth_init (gd->bd);
 603         if (NetRestartWrap) {
 604                 NetRestartWrap = 0;
 605                 if (NetDevExists && !once) {
 606                         NetSetTimeout (10UL * CFG_HZ, startAgainTimeout);
 607                         NetSetHandler (startAgainHandler);
 608                 } else {
 609                         NetState = NETLOOP_FAIL;
 610                 }
 611         } else {
 612                 NetState = NETLOOP_RESTART;
 613         }
 614 #endif  /* CONFIG_NET_MULTI */
 615 }
 616
 617 /**********************************************************************/
 618 /*
 619  *      Miscelaneous bits.
 620  */
 621
 622 void
 623 NetSetHandler(rxhand_f * f)
 624 {
 625         packetHandler = f;
 626 }
 627
 628
 629 void
 630 NetSetTimeout(ulong iv, thand_f * f)
 631 {
 632         if (iv == 0) {
 633                 timeHandler = (thand_f *)0;
 634         } else {
 635                 timeHandler = f;
 636                 timeStart = get_timer(0);
 637                 timeDelta = iv;
 638         }
 639 }
 640
 641
 642 void
 643 NetSendPacket(volatile uchar * pkt, int len)
 644 {
 645         (void) eth_send(pkt, len);
 646 }
 647
 648 int
 649 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
 650 {
 651         uchar *pkt;
 652
 653         /* convert to new style broadcast */
 654         if (dest == 0)
 655                 dest = 0xFFFFFFFF;
 656
 657         /* if broadcast, make the ether address a broadcast and don't do ARP */
 658         if (dest == 0xFFFFFFFF)
 659                 ether = NetBcastAddr;
 660
 661         /* if MAC address was not discovered yet, save the packet and do an ARP request */
 662         if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
 663
 664 #ifdef ET_DEBUG
 665                 printf("sending ARP for %08lx\n", dest);
 666 #endif
 667                 NetArpWaitPacketIP = dest;
 668                 NetArpWaitPacketMAC = ether;
 669
 670                 pkt = NetArpWaitTxPacket;
 671                 pkt += NetSetEther (pkt, NetArpWaitPacketMAC, PROT_IP);
 672
 673                 NetSetIP (pkt, dest, dport, sport, len);
 674                 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len);
 675
 676                 /* size of the waiting packet */
 677                 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE + len;
 678
 679                 /* and do the ARP request */
 680                 NetArpWaitTry = 1;
 681                 NetArpWaitTimerStart = get_timer(0);
 682                 ArpRequest();
 683                 return 1;       /* waiting */
 684         }
 685
 686 #ifdef ET_DEBUG
 687         printf("sending UDP to %08lx/%02x:%02x:%02x:%02x:%02x:%02x\n",
 688                 dest, ether[0], ether[1], ether[2], ether[3], ether[4], ether[5]);
 689 #endif
 690
 691         pkt = (uchar *)NetTxPacket;
 692         pkt += NetSetEther (pkt, ether, PROT_IP);
 693         NetSetIP (pkt, dest, dport, sport, len);
 694         (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len);
 695
 696         return 0;       /* transmitted */
 697 }
 698
 699 #if defined(CONFIG_CMD_PING)
 700 static ushort PingSeqNo;
 701
 702 int PingSend(void)
 703 {
 704         static uchar mac[6];
 705         volatile IP_t *ip;
 706         volatile ushort *s;
 707         uchar *pkt;
 708
 709         /* XXX always send arp request */
 710
 711         memcpy(mac, NetEtherNullAddr, 6);
 712
 713 #ifdef ET_DEBUG
 714         printf("sending ARP for %08lx\n", NetPingIP);
 715 #endif
 716
 717         NetArpWaitPacketIP = NetPingIP;
 718         NetArpWaitPacketMAC = mac;
 719
 720         pkt = NetArpWaitTxPacket;
 721         pkt += NetSetEther(pkt, mac, PROT_IP);
 722
 723         ip = (volatile IP_t *)pkt;
 724
 725         /*
 726          *      Construct an IP and ICMP header.  (need to set no fragment bit - XXX)
 727          */
 728         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
 729         ip->ip_tos   = 0;
 730         ip->ip_len   = htons(IP_HDR_SIZE_NO_UDP + 8);
 731         ip->ip_id    = htons(NetIPID++);
 732         ip->ip_off   = htons(0x4000);   /* No fragmentation */
 733         ip->ip_ttl   = 255;
 734         ip->ip_p     = 0x01;            /* ICMP */
 735         ip->ip_sum   = 0;
 736         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
 737         NetCopyIP((void*)&ip->ip_dst, &NetPingIP);         /* - "" - */
 738         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
 739
 740         s = &ip->udp_src;               /* XXX ICMP starts here */
 741         s[0] = htons(0x0800);           /* echo-request, code */
 742         s[1] = 0;                       /* checksum */
 743         s[2] = 0;                       /* identifier */
 744         s[3] = htons(PingSeqNo++);      /* sequence number */
 745         s[1] = ~NetCksum((uchar *)s, 8/2);
 746
 747         /* size of the waiting packet */
 748         NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8;
 749
 750         /* and do the ARP request */
 751         NetArpWaitTry = 1;
 752         NetArpWaitTimerStart = get_timer(0);
 753         ArpRequest();
 754         return 1;       /* waiting */
 755 }
 756
 757 static void
 758 PingTimeout (void)
 759 {
 760         eth_halt();
 761         NetState = NETLOOP_FAIL;        /* we did not get the reply */
 762 }
 763
 764 static void
 765 PingHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
 766 {
 767         IPaddr_t tmp;
 768         volatile IP_t *ip = (volatile IP_t *)pkt;
 769
 770         tmp = NetReadIP((void *)&ip->ip_src);
 771         if (tmp != NetPingIP)
 772                 return;
 773
 774         NetState = NETLOOP_SUCCESS;
 775 }
 776
 777 static void PingStart(void)
 778 {
 779 #if defined(CONFIG_NET_MULTI)
 780         printf ("Using %s device\n", eth_get_name());
 781 #endif  /* CONFIG_NET_MULTI */
 782         NetSetTimeout (10UL * CFG_HZ, PingTimeout);
 783         NetSetHandler (PingHandler);
 784
 785         PingSend();
 786 }
 787 #endif
 788
 789 #if defined(CONFIG_CMD_CDP)
 790
 791 #define CDP_DEVICE_ID_TLV               0x0001
 792 #define CDP_ADDRESS_TLV                 0x0002
 793 #define CDP_PORT_ID_TLV                 0x0003
 794 #define CDP_CAPABILITIES_TLV            0x0004
 795 #define CDP_VERSION_TLV                 0x0005
 796 #define CDP_PLATFORM_TLV                0x0006
 797 #define CDP_NATIVE_VLAN_TLV             0x000a
 798 #define CDP_APPLIANCE_VLAN_TLV          0x000e
 799 #define CDP_TRIGGER_TLV                 0x000f
 800 #define CDP_POWER_CONSUMPTION_TLV       0x0010
 801 #define CDP_SYSNAME_TLV                 0x0014
 802 #define CDP_SYSOBJECT_TLV               0x0015
 803 #define CDP_MANAGEMENT_ADDRESS_TLV      0x0016
 804
 805 #define CDP_TIMEOUT                     (CFG_HZ/4)      /* one packet every 250ms */
 806
 807 static int CDPSeq;
 808 static int CDPOK;
 809
 810 ushort CDPNativeVLAN;
 811 ushort CDPApplianceVLAN;
 812
 813 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 0x00 };
 814
 815 static ushort CDP_compute_csum(const uchar *buff, ushort len)
 816 {
 817         ushort csum;
 818         int     odd;
 819         ulong   result = 0;
 820         ushort  leftover;
 821         ushort *p;
 822
 823         if (len > 0) {
 824                 odd = 1 & (ulong)buff;
 825                 if (odd) {
 826                         result = *buff << 8;
 827                         len--;
 828                         buff++;
 829                 }
 830                 while (len > 1) {
 831                         p = (ushort *)buff;
 832                         result += *p++;
 833                         buff = (uchar *)p;
 834                         if (result & 0x80000000)
 835                                 result = (result & 0xFFFF) + (result >> 16);
 836                         len -= 2;
 837                 }
 838                 if (len) {
 839                         leftover = (signed short)(*(const signed char *)buff);
 840                         /* CISCO SUCKS big time! (and blows too):
 841                          * CDP uses the IP checksum algorithm with a twist;
 842                          * for the last byte it *sign* extends and sums.
 843                          */
 844                         result = (result & 0xffff0000) | ((result + leftover) & 0x0000ffff);
 845                 }
 846                 while (result >> 16)
 847                         result = (result & 0xFFFF) + (result >> 16);
 848
 849                 if (odd)
 850                         result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
 851         }
 852
 853         /* add up 16-bit and 17-bit words for 17+c bits */
 854         result = (result & 0xffff) + (result >> 16);
 855         /* add up 16-bit and 2-bit for 16+c bit */
 856         result = (result & 0xffff) + (result >> 16);
 857         /* add up carry.. */
 858         result = (result & 0xffff) + (result >> 16);
 859
 860         /* negate */
 861         csum = ~(ushort)result;
 862
 863         /* run time endian detection */
 864         if (csum != htons(csum))        /* little endian */
 865                 csum = htons(csum);
 866
 867         return csum;
 868 }
 869
 870 int CDPSendTrigger(void)
 871 {
 872         volatile uchar *pkt;
 873         volatile ushort *s;
 874         volatile ushort *cp;
 875         Ethernet_t *et;
 876         int len;
 877         ushort chksum;
 878 #if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID)   || \
 879     defined(CONFIG_CDP_VERSION)   || defined(CONFIG_CDP_PLATFORM)
 880         char buf[32];
 881 #endif
 882
 883         pkt = NetTxPacket;
 884         et = (Ethernet_t *)pkt;
 885
 886         /* NOTE: trigger sent not on any VLAN */
 887
 888         /* form ethernet header */
 889         memcpy(et->et_dest, NetCDPAddr, 6);
 890         memcpy(et->et_src, NetOurEther, 6);
 891
 892         pkt += ETHER_HDR_SIZE;
 893
 894         /* SNAP header */
 895         memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr));
 896         pkt += sizeof(CDP_SNAP_hdr);
 897
 898         /* CDP header */
 899         *pkt++ = 0x02;                          /* CDP version 2 */
 900         *pkt++ = 180;                           /* TTL */
 901         s = (volatile ushort *)pkt;
 902         cp = s;
 903         *s++ = htons(0);                        /* checksum (0 for later calculation) */
 904
 905         /* CDP fields */
 906 #ifdef CONFIG_CDP_DEVICE_ID
 907         *s++ = htons(CDP_DEVICE_ID_TLV);
 908         *s++ = htons(CONFIG_CDP_DEVICE_ID);
 909         memset(buf, 0, sizeof(buf));
 910         sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%02X%02X%02X%02X%02X%02X",
 911                 NetOurEther[0] & 0xff, NetOurEther[1] & 0xff,
 912                 NetOurEther[2] & 0xff, NetOurEther[3] & 0xff,
 913                 NetOurEther[4] & 0xff, NetOurEther[5] & 0xff);
 914         memcpy((uchar *)s, buf, 16);
 915         s += 16 / 2;
 916 #endif
 917
 918 #ifdef CONFIG_CDP_PORT_ID
 919         *s++ = htons(CDP_PORT_ID_TLV);
 920         memset(buf, 0, sizeof(buf));
 921         sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index());
 922         len = strlen(buf);
 923         if (len & 1)    /* make it even */
 924                 len++;
 925         *s++ = htons(len + 4);
 926         memcpy((uchar *)s, buf, len);
 927         s += len / 2;
 928 #endif
 929
 930 #ifdef CONFIG_CDP_CAPABILITIES
 931         *s++ = htons(CDP_CAPABILITIES_TLV);
 932         *s++ = htons(8);
 933         *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES);
 934         s += 2;
 935 #endif
 936
 937 #ifdef CONFIG_CDP_VERSION
 938         *s++ = htons(CDP_VERSION_TLV);
 939         memset(buf, 0, sizeof(buf));
 940         strcpy(buf, CONFIG_CDP_VERSION);
 941         len = strlen(buf);
 942         if (len & 1)    /* make it even */
 943                 len++;
 944         *s++ = htons(len + 4);
 945         memcpy((uchar *)s, buf, len);
 946         s += len / 2;
 947 #endif
 948
 949 #ifdef CONFIG_CDP_PLATFORM
 950         *s++ = htons(CDP_PLATFORM_TLV);
 951         memset(buf, 0, sizeof(buf));
 952         strcpy(buf, CONFIG_CDP_PLATFORM);
 953         len = strlen(buf);
 954         if (len & 1)    /* make it even */
 955                 len++;
 956         *s++ = htons(len + 4);
 957         memcpy((uchar *)s, buf, len);
 958         s += len / 2;
 959 #endif
 960
 961 #ifdef CONFIG_CDP_TRIGGER
 962         *s++ = htons(CDP_TRIGGER_TLV);
 963         *s++ = htons(8);
 964         *(ulong *)s = htonl(CONFIG_CDP_TRIGGER);
 965         s += 2;
 966 #endif
 967
 968 #ifdef CONFIG_CDP_POWER_CONSUMPTION
 969         *s++ = htons(CDP_POWER_CONSUMPTION_TLV);
 970         *s++ = htons(6);
 971         *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION);
 972 #endif
 973
 974         /* length of ethernet packet */
 975         len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE);
 976         et->et_protlen = htons(len);
 977
 978         len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr);
 979         chksum = CDP_compute_csum((uchar *)NetTxPacket + len, (uchar *)s - (NetTxPacket + len));
 980         if (chksum == 0)
 981                 chksum = 0xFFFF;
 982         *cp = htons(chksum);
 983
 984         (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket);
 985         return 0;
 986 }
 987
 988 static void
 989 CDPTimeout (void)
 990 {
 991         CDPSeq++;
 992
 993         if (CDPSeq < 3) {
 994                 NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
 995                 CDPSendTrigger();
 996                 return;
 997         }
 998
 999         /* if not OK try again */
1000         if (!CDPOK)
1001                 NetStartAgain();
1002         else
1003                 NetState = NETLOOP_SUCCESS;
1004 }
1005
1006 static void
1007 CDPDummyHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
1008 {
1009         /* nothing */
1010 }
1011
1012 static void
1013 CDPHandler(const uchar * pkt, unsigned len)
1014 {
1015         const uchar *t;
1016         const ushort *ss;
1017         ushort type, tlen;
1018         uchar applid;
1019         ushort vlan, nvlan;
1020
1021         /* minimum size? */
1022         if (len < sizeof(CDP_SNAP_hdr) + 4)
1023                 goto pkt_short;
1024
1025         /* check for valid CDP SNAP header */
1026         if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0)
1027                 return;
1028
1029         pkt += sizeof(CDP_SNAP_hdr);
1030         len -= sizeof(CDP_SNAP_hdr);
1031
1032         /* Version of CDP protocol must be >= 2 and TTL != 0 */
1033         if (pkt[0] < 0x02 || pkt[1] == 0)
1034                 return;
1035
1036         /* if version is greater than 0x02 maybe we'll have a problem; output a warning */
1037         if (pkt[0] != 0x02)
1038                 printf("** WARNING: CDP packet received with a protocol version %d > 2\n",
1039                                 pkt[0] & 0xff);
1040
1041         if (CDP_compute_csum(pkt, len) != 0)
1042                 return;
1043
1044         pkt += 4;
1045         len -= 4;
1046
1047         vlan = htons(-1);
1048         nvlan = htons(-1);
1049         while (len > 0) {
1050                 if (len < 4)
1051                         goto pkt_short;
1052
1053                 ss = (const ushort *)pkt;
1054                 type = ntohs(ss[0]);
1055                 tlen = ntohs(ss[1]);
1056                 if (tlen > len) {
1057                         goto pkt_short;
1058                 }
1059
1060                 pkt += tlen;
1061                 len -= tlen;
1062
1063                 ss += 2;        /* point ss to the data of the TLV */
1064                 tlen -= 4;
1065
1066                 switch (type) {
1067                         case CDP_DEVICE_ID_TLV:
1068                                 break;
1069                         case CDP_ADDRESS_TLV:
1070                                 break;
1071                         case CDP_PORT_ID_TLV:
1072                                 break;
1073                         case CDP_CAPABILITIES_TLV:
1074                                 break;
1075                         case CDP_VERSION_TLV:
1076                                 break;
1077                         case CDP_PLATFORM_TLV:
1078                                 break;
1079                         case CDP_NATIVE_VLAN_TLV:
1080                                 nvlan = *ss;
1081                                 break;
1082                         case CDP_APPLIANCE_VLAN_TLV:
1083                                 t = (const uchar *)ss;
1084                                 while (tlen > 0) {
1085                                         if (tlen < 3)
1086                                                 goto pkt_short;
1087
1088                                         applid = t[0];
1089                                         ss = (const ushort *)(t + 1);
1090
1091 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE
1092                                         if (applid == CONFIG_CDP_APPLIANCE_VLAN_TYPE)
1093                                                 vlan = *ss;
1094 #else
1095                                         vlan = ntohs(*ss);      /* XXX will this work; dunno */
1096 #endif
1097                                         t += 3; tlen -= 3;
1098                                 }
1099                                 break;
1100                         case CDP_TRIGGER_TLV:
1101                                 break;
1102                         case CDP_POWER_CONSUMPTION_TLV:
1103                                 break;
1104                         case CDP_SYSNAME_TLV:
1105                                 break;
1106                         case CDP_SYSOBJECT_TLV:
1107                                 break;
1108                         case CDP_MANAGEMENT_ADDRESS_TLV:
1109                                 break;
1110                 }
1111         }
1112
1113         CDPApplianceVLAN = vlan;
1114         CDPNativeVLAN = nvlan;
1115
1116         CDPOK = 1;
1117         return;
1118
1119  pkt_short:
1120         printf("** CDP packet is too short\n");
1121         return;
1122 }
1123
1124 static void CDPStart(void)
1125 {
1126 #if defined(CONFIG_NET_MULTI)
1127         printf ("Using %s device\n", eth_get_name());
1128 #endif
1129         CDPSeq = 0;
1130         CDPOK = 0;
1131
1132         CDPNativeVLAN = htons(-1);
1133         CDPApplianceVLAN = htons(-1);
1134
1135         NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
1136         NetSetHandler (CDPDummyHandler);
1137
1138         CDPSendTrigger();
1139 }
1140 #endif
1141
1142
1143 void
1144 NetReceive(volatile uchar * inpkt, int len)
1145 {
1146         Ethernet_t *et;
1147         IP_t    *ip;
1148         ARP_t   *arp;
1149         IPaddr_t tmp;
1150         int     x;
1151         uchar *pkt;
1152 #if defined(CONFIG_CMD_CDP)
1153         int iscdp;
1154 #endif
1155         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1156
1157 #ifdef ET_DEBUG
1158         printf("packet received\n");
1159 #endif
1160
1161         NetRxPkt = inpkt;
1162         NetRxPktLen = len;
1163         et = (Ethernet_t *)inpkt;
1164
1165         /* too small packet? */
1166         if (len < ETHER_HDR_SIZE)
1167                 return;
1168
1169 #ifdef CONFIG_API
1170         if (push_packet) {
1171                 (*push_packet)(inpkt, len);
1172                 return;
1173         }
1174 #endif
1175
1176 #if defined(CONFIG_CMD_CDP)
1177         /* keep track if packet is CDP */
1178         iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0;
1179 #endif
1180
1181         myvlanid = ntohs(NetOurVLAN);
1182         if (myvlanid == (ushort)-1)
1183                 myvlanid = VLAN_NONE;
1184         mynvlanid = ntohs(NetOurNativeVLAN);
1185         if (mynvlanid == (ushort)-1)
1186                 mynvlanid = VLAN_NONE;
1187
1188         x = ntohs(et->et_protlen);
1189
1190 #ifdef ET_DEBUG
1191         printf("packet received\n");
1192 #endif
1193
1194         if (x < 1514) {
1195                 /*
1196                  *      Got a 802 packet.  Check the other protocol field.
1197                  */
1198                 x = ntohs(et->et_prot);
1199
1200                 ip = (IP_t *)(inpkt + E802_HDR_SIZE);
1201                 len -= E802_HDR_SIZE;
1202
1203         } else if (x != PROT_VLAN) {    /* normal packet */
1204                 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE);
1205                 len -= ETHER_HDR_SIZE;
1206
1207         } else {                        /* VLAN packet */
1208                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et;
1209
1210 #ifdef ET_DEBUG
1211                 printf("VLAN packet received\n");
1212 #endif
1213                 /* too small packet? */
1214                 if (len < VLAN_ETHER_HDR_SIZE)
1215                         return;
1216
1217                 /* if no VLAN active */
1218                 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
1219 #if defined(CONFIG_CMD_CDP)
1220                                 && iscdp == 0
1221 #endif
1222                                 )
1223                         return;
1224
1225                 cti = ntohs(vet->vet_tag);
1226                 vlanid = cti & VLAN_IDMASK;
1227                 x = ntohs(vet->vet_type);
1228
1229                 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE);
1230                 len -= VLAN_ETHER_HDR_SIZE;
1231         }
1232
1233 #ifdef ET_DEBUG
1234         printf("Receive from protocol 0x%x\n", x);
1235 #endif
1236
1237 #if defined(CONFIG_CMD_CDP)
1238         if (iscdp) {
1239                 CDPHandler((uchar *)ip, len);
1240                 return;
1241         }
1242 #endif
1243
1244         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1245                 if (vlanid == VLAN_NONE)
1246                         vlanid = (mynvlanid & VLAN_IDMASK);
1247                 /* not matched? */
1248                 if (vlanid != (myvlanid & VLAN_IDMASK))
1249                         return;
1250         }
1251
1252         switch (x) {
1253
1254         case PROT_ARP:
1255                 /*
1256                  * We have to deal with two types of ARP packets:
1257                  * - REQUEST packets will be answered by sending  our
1258                  *   IP address - if we know it.
1259                  * - REPLY packates are expected only after we asked
1260                  *   for the TFTP server's or the gateway's ethernet
1261                  *   address; so if we receive such a packet, we set
1262                  *   the server ethernet address
1263                  */
1264 #ifdef ET_DEBUG
1265                 puts ("Got ARP\n");
1266 #endif
1267                 arp = (ARP_t *)ip;
1268                 if (len < ARP_HDR_SIZE) {
1269                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1270                         return;
1271                 }
1272                 if (ntohs(arp->ar_hrd) != ARP_ETHER) {
1273                         return;
1274                 }
1275                 if (ntohs(arp->ar_pro) != PROT_IP) {
1276                         return;
1277                 }
1278                 if (arp->ar_hln != 6) {
1279                         return;
1280                 }
1281                 if (arp->ar_pln != 4) {
1282                         return;
1283                 }
1284
1285                 if (NetOurIP == 0) {
1286                         return;
1287                 }
1288
1289                 if (NetReadIP(&arp->ar_data[16]) != NetOurIP) {
1290                         return;
1291                 }
1292
1293                 switch (ntohs(arp->ar_op)) {
1294                 case ARPOP_REQUEST:             /* reply with our IP address    */
1295 #ifdef ET_DEBUG
1296                         puts ("Got ARP REQUEST, return our IP\n");
1297 #endif
1298                         pkt = (uchar *)et;
1299                         pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
1300                         arp->ar_op = htons(ARPOP_REPLY);
1301                         memcpy   (&arp->ar_data[10], &arp->ar_data[0], 6);
1302                         NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
1303                         memcpy   (&arp->ar_data[ 0], NetOurEther, 6);
1304                         NetCopyIP(&arp->ar_data[ 6], &NetOurIP);
1305                         (void) eth_send((uchar *)et, (pkt - (uchar *)et) + ARP_HDR_SIZE);
1306                         return;
1307
1308                 case ARPOP_REPLY:               /* arp reply */
1309                         /* are we waiting for a reply */
1310                         if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
1311                                 break;
1312 #ifdef ET_DEBUG
1313                         printf("Got ARP REPLY, set server/gtwy eth addr (%02x:%02x:%02x:%02x:%02x:%02x)\n",
1314                                 arp->ar_data[0], arp->ar_data[1],
1315                                 arp->ar_data[2], arp->ar_data[3],
1316                                 arp->ar_data[4], arp->ar_data[5]);
1317 #endif
1318
1319                         tmp = NetReadIP(&arp->ar_data[6]);
1320
1321                         /* matched waiting packet's address */
1322                         if (tmp == NetArpWaitReplyIP) {
1323 #ifdef ET_DEBUG
1324                                 puts ("Got it\n");
1325 #endif
1326                                 /* save address for later use */
1327                                 memcpy(NetArpWaitPacketMAC, &arp->ar_data[0], 6);
1328
1329 #ifdef CONFIG_NETCONSOLE
1330                                 (*packetHandler)(0,0,0,0);
1331 #endif
1332                                 /* modify header, and transmit it */
1333                                 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6);
1334                                 (void) eth_send(NetArpWaitTxPacket, NetArpWaitTxPacketSize);
1335
1336                                 /* no arp request pending now */
1337                                 NetArpWaitPacketIP = 0;
1338                                 NetArpWaitTxPacketSize = 0;
1339                                 NetArpWaitPacketMAC = NULL;
1340
1341                         }
1342                         return;
1343                 default:
1344 #ifdef ET_DEBUG
1345                         printf("Unexpected ARP opcode 0x%x\n", ntohs(arp->ar_op));
1346 #endif
1347                         return;
1348                 }
1349                 break;
1350
1351         case PROT_RARP:
1352 #ifdef ET_DEBUG
1353                 puts ("Got RARP\n");
1354 #endif
1355                 arp = (ARP_t *)ip;
1356                 if (len < ARP_HDR_SIZE) {
1357                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1358                         return;
1359                 }
1360
1361                 if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
1362                         (ntohs(arp->ar_hrd) != ARP_ETHER)   ||
1363                         (ntohs(arp->ar_pro) != PROT_IP)     ||
1364                         (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
1365
1366                         puts ("invalid RARP header\n");
1367                 } else {
1368                         NetCopyIP(&NetOurIP,    &arp->ar_data[16]);
1369                         if (NetServerIP == 0)
1370                                 NetCopyIP(&NetServerIP, &arp->ar_data[ 6]);
1371                         memcpy (NetServerEther, &arp->ar_data[ 0], 6);
1372
1373                         (*packetHandler)(0,0,0,0);
1374                 }
1375                 break;
1376
1377         case PROT_IP:
1378 #ifdef ET_DEBUG
1379                 puts ("Got IP\n");
1380 #endif
1381                 if (len < IP_HDR_SIZE) {
1382                         debug ("len bad %d < %d\n", len, IP_HDR_SIZE);
1383                         return;
1384                 }
1385                 if (len < ntohs(ip->ip_len)) {
1386                         printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
1387                         return;
1388                 }
1389                 len = ntohs(ip->ip_len);
1390 #ifdef ET_DEBUG
1391                 printf("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
1392 #endif
1393                 if ((ip->ip_hl_v & 0xf0) != 0x40) {
1394                         return;
1395                 }
1396                 if (ip->ip_off & htons(0x1fff)) { /* Can't deal w/ fragments */
1397                         return;
1398                 }
1399                 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
1400                         puts ("checksum bad\n");
1401                         return;
1402                 }
1403                 tmp = NetReadIP(&ip->ip_dst);
1404                 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
1405 #ifdef CONFIG_MCAST_TFTP
1406                         if (Mcast_addr != tmp)
1407 #endif
1408                         return;
1409                 }
1410                 /*
1411                  * watch for ICMP host redirects
1412                  *
1413                  * There is no real handler code (yet). We just watch
1414                  * for ICMP host redirect messages. In case anybody
1415                  * sees these messages: please contact me
1416                  * (wd@denx.de), or - even better - send me the
1417                  * necessary fixes :-)
1418                  *
1419                  * Note: in all cases where I have seen this so far
1420                  * it was a problem with the router configuration,
1421                  * for instance when a router was configured in the
1422                  * BOOTP reply, but the TFTP server was on the same
1423                  * subnet. So this is probably a warning that your
1424                  * configuration might be wrong. But I'm not really
1425                  * sure if there aren't any other situations.
1426                  */
1427                 if (ip->ip_p == IPPROTO_ICMP) {
1428                         ICMP_t *icmph = (ICMP_t *)&(ip->udp_src);
1429
1430                         switch (icmph->type) {
1431                         case ICMP_REDIRECT:
1432                                 if (icmph->code != ICMP_REDIR_HOST)
1433                                         return;
1434                                 puts (" ICMP Host Redirect to ");
1435                                 print_IPaddr(icmph->un.gateway);
1436                                 putc(' ');
1437                                 return;
1438 #if defined(CONFIG_CMD_PING)
1439                         case ICMP_ECHO_REPLY:
1440                                 /*
1441                                  *      IP header OK.  Pass the packet to the current handler.
1442                                  */
1443                                 /* XXX point to ip packet */
1444                                 (*packetHandler)((uchar *)ip, 0, 0, 0);
1445                                 return;
1446                         case ICMP_ECHO_REQUEST:
1447 #ifdef ET_DEBUG
1448                                 printf ("Got ICMP ECHO REQUEST, return %d bytes \n",
1449                                         ETHER_HDR_SIZE + len);
1450 #endif
1451                                 memcpy (&et->et_dest[0], &et->et_src[0], 6);
1452                                 memcpy (&et->et_src[ 0], NetOurEther, 6);
1453
1454                                 ip->ip_sum = 0;
1455                                 ip->ip_off = 0;
1456                                 NetCopyIP((void*)&ip->ip_dst, &ip->ip_src);
1457                                 NetCopyIP((void*)&ip->ip_src, &NetOurIP);
1458                                 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP >> 1);
1459
1460                                 icmph->type = ICMP_ECHO_REPLY;
1461                                 icmph->checksum = 0;
1462                                 icmph->checksum = ~NetCksum((uchar *)icmph,
1463                                                 (len - IP_HDR_SIZE_NO_UDP) >> 1);
1464                                 (void) eth_send((uchar *)et, ETHER_HDR_SIZE + len);
1465                                 return;
1466 #endif
1467                         default:
1468                                 return;
1469                         }
1470                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1471                         return;
1472                 }
1473
1474 #ifdef CONFIG_UDP_CHECKSUM
1475                 if (ip->udp_xsum != 0) {
1476                         ulong   xsum;
1477                         ushort *sumptr;
1478                         ushort  sumlen;
1479
1480                         xsum  = ip->ip_p;
1481                         xsum += (ntohs(ip->udp_len));
1482                         xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
1483                         xsum += (ntohl(ip->ip_src) >>  0) & 0x0000ffff;
1484                         xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
1485                         xsum += (ntohl(ip->ip_dst) >>  0) & 0x0000ffff;
1486
1487                         sumlen = ntohs(ip->udp_len);
1488                         sumptr = (ushort *) &(ip->udp_src);
1489
1490                         while (sumlen > 1) {
1491                                 ushort sumdata;
1492
1493                                 sumdata = *sumptr++;
1494                                 xsum += ntohs(sumdata);
1495                                 sumlen -= 2;
1496                         }
1497                         if (sumlen > 0) {
1498                                 ushort sumdata;
1499
1500                                 sumdata = *(unsigned char *) sumptr;
1501                                 sumdata = (sumdata << 8) & 0xff00;
1502                                 xsum += sumdata;
1503                         }
1504                         while ((xsum >> 16) != 0) {
1505                                 xsum = (xsum & 0x0000ffff) + ((xsum >> 16) & 0x0000ffff);
1506                         }
1507                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1508                                 printf(" UDP wrong checksum %08x %08x\n", xsum, ntohs(ip->udp_xsum));
1509                                 return;
1510                         }
1511                 }
1512 #endif
1513
1514
1515 #ifdef CONFIG_NETCONSOLE
1516                 nc_input_packet((uchar *)ip +IP_HDR_SIZE,
1517                                                 ntohs(ip->udp_dst),
1518                                                 ntohs(ip->udp_src),
1519                                                 ntohs(ip->udp_len) - 8);
1520 #endif
1521                 /*
1522                  *      IP header OK.  Pass the packet to the current handler.
1523                  */
1524                 (*packetHandler)((uchar *)ip +IP_HDR_SIZE,
1525                                                 ntohs(ip->udp_dst),
1526                                                 ntohs(ip->udp_src),
1527                                                 ntohs(ip->udp_len) - 8);
1528                 break;
1529         }
1530 }
1531
1532
1533 /**********************************************************************/
1534
1535 static int net_check_prereq (proto_t protocol)
1536 {
1537         switch (protocol) {
1538                 /* Fall through */
1539 #if defined(CONFIG_CMD_PING)
1540         case PING:
1541                 if (NetPingIP == 0) {
1542                         puts ("*** ERROR: ping address not given\n");
1543                         return (1);
1544                 }
1545                 goto common;
1546 #endif
1547 #if defined(CONFIG_CMD_SNTP)
1548         case SNTP:
1549                 if (NetNtpServerIP == 0) {
1550                         puts ("*** ERROR: NTP server address not given\n");
1551                         return (1);
1552                 }
1553                 goto common;
1554 #endif
1555 #if defined(CONFIG_CMD_NFS)
1556         case NFS:
1557 #endif
1558         case NETCONS:
1559         case TFTP:
1560                 if (NetServerIP == 0) {
1561                         puts ("*** ERROR: `serverip' not set\n");
1562                         return (1);
1563                 }
1564 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP)
1565     common:
1566 #endif
1567
1568                 if (NetOurIP == 0) {
1569                         puts ("*** ERROR: `ipaddr' not set\n");
1570                         return (1);
1571                 }
1572                 /* Fall through */
1573
1574         case DHCP:
1575         case RARP:
1576         case BOOTP:
1577         case CDP:
1578                 if (memcmp (NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
1579 #ifdef CONFIG_NET_MULTI
1580                         extern int eth_get_dev_index (void);
1581                         int num = eth_get_dev_index ();
1582
1583                         switch (num) {
1584                         case -1:
1585                                 puts ("*** ERROR: No ethernet found.\n");
1586                                 return (1);
1587                         case 0:
1588                                 puts ("*** ERROR: `ethaddr' not set\n");
1589                                 break;
1590                         default:
1591                                 printf ("*** ERROR: `eth%daddr' not set\n",
1592                                         num);
1593                                 break;
1594                         }
1595
1596                         NetStartAgain ();
1597                         return (2);
1598 #else
1599                         puts ("*** ERROR: `ethaddr' not set\n");
1600                         return (1);
1601 #endif
1602                 }
1603                 /* Fall through */
1604         default:
1605                 return (0);
1606         }
1607         return (0);             /* OK */
1608 }
1609 /**********************************************************************/
1610
1611 int
1612 NetCksumOk(uchar * ptr, int len)
1613 {
1614         return !((NetCksum(ptr, len) + 1) & 0xfffe);
1615 }
1616
1617
1618 unsigned
1619 NetCksum(uchar * ptr, int len)
1620 {
1621         ulong   xsum;
1622         ushort *p = (ushort *)ptr;
1623
1624         xsum = 0;
1625         while (len-- > 0)
1626                 xsum += *p++;
1627         xsum = (xsum & 0xffff) + (xsum >> 16);
1628         xsum = (xsum & 0xffff) + (xsum >> 16);
1629         return (xsum & 0xffff);
1630 }
1631
1632 int
1633 NetEthHdrSize(void)
1634 {
1635         ushort myvlanid;
1636
1637         myvlanid = ntohs(NetOurVLAN);
1638         if (myvlanid == (ushort)-1)
1639                 myvlanid = VLAN_NONE;
1640
1641         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : VLAN_ETHER_HDR_SIZE;
1642 }
1643
1644 int
1645 NetSetEther(volatile uchar * xet, uchar * addr, uint prot)
1646 {
1647         Ethernet_t *et = (Ethernet_t *)xet;
1648         ushort myvlanid;
1649
1650         myvlanid = ntohs(NetOurVLAN);
1651         if (myvlanid == (ushort)-1)
1652                 myvlanid = VLAN_NONE;
1653
1654         memcpy (et->et_dest, addr, 6);
1655         memcpy (et->et_src, NetOurEther, 6);
1656         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1657         et->et_protlen = htons(prot);
1658                 return ETHER_HDR_SIZE;
1659         } else {
1660                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet;
1661
1662                 vet->vet_vlan_type = htons(PROT_VLAN);
1663                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1664                 vet->vet_type = htons(prot);
1665                 return VLAN_ETHER_HDR_SIZE;
1666         }
1667 }
1668
1669 void
1670 NetSetIP(volatile uchar * xip, IPaddr_t dest, int dport, int sport, int len)
1671 {
1672         volatile IP_t *ip = (IP_t *)xip;
1673
1674         /*
1675          *      If the data is an odd number of bytes, zero the
1676          *      byte after the last byte so that the checksum
1677          *      will work.
1678          */
1679         if (len & 1)
1680                 xip[IP_HDR_SIZE + len] = 0;
1681
1682         /*
1683          *      Construct an IP and UDP header.
1684          *      (need to set no fragment bit - XXX)
1685          */
1686         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
1687         ip->ip_tos   = 0;
1688         ip->ip_len   = htons(IP_HDR_SIZE + len);
1689         ip->ip_id    = htons(NetIPID++);
1690         ip->ip_off   = htons(0x4000);   /* No fragmentation */
1691         ip->ip_ttl   = 255;
1692         ip->ip_p     = 17;              /* UDP */
1693         ip->ip_sum   = 0;
1694         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
1695         NetCopyIP((void*)&ip->ip_dst, &dest);      /* - "" - */
1696         ip->udp_src  = htons(sport);
1697         ip->udp_dst  = htons(dport);
1698         ip->udp_len  = htons(8 + len);
1699         ip->udp_xsum = 0;
1700         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
1701 }
1702
1703 void copy_filename (char *dst, char *src, int size)
1704 {
1705         if (*src && (*src == '"')) {
1706                 ++src;
1707                 --size;
1708         }
1709
1710         while ((--size > 0) && *src && (*src != '"')) {
1711                 *dst++ = *src++;
1712         }
1713         *dst = '\0';
1714 }
1715
1716 #endif
1717
1718 void ip_to_string (IPaddr_t x, char *s)
1719 {
1720         x = ntohl (x);
1721         sprintf (s, "%d.%d.%d.%d",
1722                  (int) ((x >> 24) & 0xff),
1723                  (int) ((x >> 16) & 0xff),
1724                  (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
1725         );
1726 }
1727
1728 IPaddr_t string_to_ip(char *s)
1729 {
1730         IPaddr_t addr;
1731         char *e;
1732         int i;
1733
1734         if (s == NULL)
1735                 return(0);
1736
1737         for (addr=0, i=0; i<4; ++i) {
1738                 ulong val = s ? simple_strtoul(s, &e, 10) : 0;
1739                 addr <<= 8;
1740                 addr |= (val & 0xFF);
1741                 if (s) {
1742                         s = (*e) ? e+1 : e;
1743                 }
1744         }
1745
1746         return (htonl(addr));
1747 }
1748
1749 void VLAN_to_string(ushort x, char *s)
1750 {
1751         x = ntohs(x);
1752
1753         if (x == (ushort)-1)
1754                 x = VLAN_NONE;
1755
1756         if (x == VLAN_NONE)
1757                 strcpy(s, "none");
1758         else
1759                 sprintf(s, "%d", x & VLAN_IDMASK);
1760 }
1761
1762 ushort string_to_VLAN(char *s)
1763 {
1764         ushort id;
1765
1766         if (s == NULL)
1767                 return htons(VLAN_NONE);
1768
1769         if (*s < '0' || *s > '9')
1770                 id = VLAN_NONE;
1771         else
1772                 id = (ushort)simple_strtoul(s, NULL, 10);
1773
1774         return htons(id);
1775 }
1776
1777 void print_IPaddr (IPaddr_t x)
1778 {
1779         char tmp[16];
1780
1781         ip_to_string (x, tmp);
1782
1783         puts (tmp);
1784 }
1785
1786 IPaddr_t getenv_IPaddr (char *var)
1787 {
1788         return (string_to_ip(getenv(var)));
1789 }
1790
1791 ushort getenv_VLAN(char *var)
1792 {
1793         return (string_to_VLAN(getenv(var)));
1794 }