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 #ifndef CONFIG_ARP_TIMEOUT
  98 # define ARP_TIMEOUT            50UL    /* Deciseconds before trying ARP again */
  99 #elif (CONFIG_ARP_TIMEOUT < 100)
 100 # error "Due to possible overflow CONFIG_ARP_TIMEOUT must be greater than 100ms"
 101 #else
 102 # if (CONFIG_ARP_TIMEOUT % 100)
 103 #  warning "Supported ARP_TIMEOUT precision is 100ms"
 104 # endif
 105 # define ARP_TIMEOUT            (CONFIG_ARP_TIMEOUT / 100)
 106 #endif
 107
 108
 109 #ifndef CONFIG_NET_RETRY_COUNT
 110 # define ARP_TIMEOUT_COUNT      5       /* # of timeouts before giving up  */
 111 #else
 112 # define ARP_TIMEOUT_COUNT      CONFIG_NET_RETRY_COUNT
 113 #endif
 114
 115 #if 0
 116 #define ET_DEBUG
 117 #endif
 118
 119 /** BOOTP EXTENTIONS **/
 120
 121 IPaddr_t        NetOurSubnetMask=0;             /* Our subnet mask (0=unknown)  */
 122 IPaddr_t        NetOurGatewayIP=0;              /* Our gateways IP address      */
 123 IPaddr_t        NetOurDNSIP=0;                  /* Our DNS IP address           */
 124 #if defined(CONFIG_BOOTP_DNS2)
 125 IPaddr_t        NetOurDNS2IP=0;                 /* Our 2nd DNS IP address       */
 126 #endif
 127 char            NetOurNISDomain[32]={0,};       /* Our NIS domain               */
 128 char            NetOurHostName[32]={0,};        /* Our hostname                 */
 129 char            NetOurRootPath[64]={0,};        /* Our bootpath                 */
 130 ushort          NetBootFileSize=0;              /* Our bootfile size in blocks  */
 131
 132 #ifdef CONFIG_MCAST_TFTP        /* Multicast TFTP */
 133 IPaddr_t Mcast_addr;
 134 #endif
 135
 136 /** END OF BOOTP EXTENTIONS **/
 137
 138 ulong           NetBootFileXferSize;    /* The actual transferred size of the bootfile (in bytes) */
 139 uchar           NetOurEther[6];         /* Our ethernet address                 */
 140 uchar           NetServerEther[6] =     /* Boot server enet address             */
 141                         { 0, 0, 0, 0, 0, 0 };
 142 IPaddr_t        NetOurIP;               /* Our IP addr (0 = unknown)            */
 143 IPaddr_t        NetServerIP;            /* Server IP addr (0 = unknown)         */
 144 volatile uchar *NetRxPkt;               /* Current receive packet               */
 145 int             NetRxPktLen;            /* Current rx packet length             */
 146 unsigned        NetIPID;                /* IP packet ID                         */
 147 uchar           NetBcastAddr[6] =       /* Ethernet bcast address               */
 148                         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 149 uchar           NetEtherNullAddr[6] =
 150                         { 0, 0, 0, 0, 0, 0 };
 151 #ifdef CONFIG_API
 152 void            (*push_packet)(volatile void *, int len) = 0;
 153 #endif
 154 #if defined(CONFIG_CMD_CDP)
 155 uchar           NetCDPAddr[6] =         /* Ethernet bcast address               */
 156                         { 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc };
 157 #endif
 158 int             NetState;               /* Network loop state                   */
 159 #ifdef CONFIG_NET_MULTI
 160 int             NetRestartWrap = 0;     /* Tried all network devices            */
 161 static int      NetRestarted = 0;       /* Network loop restarted               */
 162 static int      NetDevExists = 0;       /* At least one device configured       */
 163 #endif
 164
 165 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
 166 ushort          NetOurVLAN = 0xFFFF;            /* default is without VLAN      */
 167 ushort          NetOurNativeVLAN = 0xFFFF;      /* ditto                        */
 168
 169 char            BootFile[128];          /* Boot File name                       */
 170
 171 #if defined(CONFIG_CMD_PING)
 172 IPaddr_t        NetPingIP;              /* the ip address to ping               */
 173
 174 static void PingStart(void);
 175 #endif
 176
 177 #if defined(CONFIG_CMD_CDP)
 178 static void CDPStart(void);
 179 #endif
 180
 181 #if defined(CONFIG_CMD_SNTP)
 182 IPaddr_t        NetNtpServerIP;         /* NTP server IP address                */
 183 int             NetTimeOffset=0;        /* offset time from UTC                 */
 184 #endif
 185
 186 #ifdef CONFIG_NETCONSOLE
 187 void NcStart(void);
 188 int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len);
 189 #endif
 190
 191 volatile uchar  PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 192
 193 volatile uchar *NetRxPackets[PKTBUFSRX]; /* Receive packets                     */
 194
 195 static rxhand_f *packetHandler;         /* Current RX packet handler            */
 196 static thand_f *timeHandler;            /* Current timeout handler              */
 197 static ulong    timeStart;              /* Time base value                      */
 198 static ulong    timeDelta;              /* Current timeout value                */
 199 volatile uchar *NetTxPacket = 0;        /* THE transmit packet                  */
 200
 201 static int net_check_prereq (proto_t protocol);
 202
 203 /**********************************************************************/
 204
 205 IPaddr_t        NetArpWaitPacketIP;
 206 IPaddr_t        NetArpWaitReplyIP;
 207 uchar          *NetArpWaitPacketMAC;    /* MAC address of waiting packet's destination  */
 208 uchar          *NetArpWaitTxPacket;     /* THE transmit packet                  */
 209 int             NetArpWaitTxPacketSize;
 210 uchar           NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
 211 ulong           NetArpWaitTimerStart;
 212 int             NetArpWaitTry;
 213
 214 void ArpRequest (void)
 215 {
 216         int i;
 217         volatile uchar *pkt;
 218         ARP_t *arp;
 219
 220 #ifdef ET_DEBUG
 221         printf ("ARP broadcast %d\n", NetArpWaitTry);
 222 #endif
 223         pkt = NetTxPacket;
 224
 225         pkt += NetSetEther (pkt, NetBcastAddr, PROT_ARP);
 226
 227         arp = (ARP_t *) pkt;
 228
 229         arp->ar_hrd = htons (ARP_ETHER);
 230         arp->ar_pro = htons (PROT_IP);
 231         arp->ar_hln = 6;
 232         arp->ar_pln = 4;
 233         arp->ar_op = htons (ARPOP_REQUEST);
 234
 235         memcpy (&arp->ar_data[0], NetOurEther, 6);              /* source ET addr       */
 236         NetWriteIP ((uchar *) & arp->ar_data[6], NetOurIP);     /* source IP addr       */
 237         for (i = 10; i < 16; ++i) {
 238                 arp->ar_data[i] = 0;                            /* dest ET addr = 0     */
 239         }
 240
 241         if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
 242             (NetOurIP & NetOurSubnetMask)) {
 243                 if (NetOurGatewayIP == 0) {
 244                         puts ("## Warning: gatewayip needed but not set\n");
 245                         NetArpWaitReplyIP = NetArpWaitPacketIP;
 246                 } else {
 247                         NetArpWaitReplyIP = NetOurGatewayIP;
 248                 }
 249         } else {
 250                 NetArpWaitReplyIP = NetArpWaitPacketIP;
 251         }
 252
 253         NetWriteIP ((uchar *) & arp->ar_data[16], NetArpWaitReplyIP);
 254         (void) eth_send (NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
 255 }
 256
 257 void ArpTimeoutCheck(void)
 258 {
 259         ulong t;
 260
 261         if (!NetArpWaitPacketIP)
 262                 return;
 263
 264         t = get_timer(0);
 265
 266         /* check for arp timeout */
 267         if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT * CFG_HZ / 10) {
 268                 NetArpWaitTry++;
 269
 270                 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
 271                         puts ("\nARP Retry count exceeded; starting again\n");
 272                         NetArpWaitTry = 0;
 273                         NetStartAgain();
 274                 } else {
 275                         NetArpWaitTimerStart = t;
 276                         ArpRequest();
 277                 }
 278         }
 279 }
 280
 281 /**********************************************************************/
 282 /*
 283  *      Main network processing loop.
 284  */
 285
 286 int
 287 NetLoop(proto_t protocol)
 288 {
 289         bd_t *bd = gd->bd;
 290
 291 #ifdef CONFIG_NET_MULTI
 292         NetRestarted = 0;
 293         NetDevExists = 0;
 294 #endif
 295
 296         /* XXX problem with bss workaround */
 297         NetArpWaitPacketMAC = NULL;
 298         NetArpWaitTxPacket = NULL;
 299         NetArpWaitPacketIP = 0;
 300         NetArpWaitReplyIP = 0;
 301         NetArpWaitTxPacket = NULL;
 302         NetTxPacket = NULL;
 303
 304         if (!NetTxPacket) {
 305                 int     i;
 306                 /*
 307                  *      Setup packet buffers, aligned correctly.
 308                  */
 309                 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
 310                 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
 311                 for (i = 0; i < PKTBUFSRX; i++) {
 312                         NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
 313                 }
 314         }
 315
 316         if (!NetArpWaitTxPacket) {
 317                 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
 318                 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
 319                 NetArpWaitTxPacketSize = 0;
 320         }
 321
 322         eth_halt();
 323 #ifdef CONFIG_NET_MULTI
 324         eth_set_current();
 325 #endif
 326         if (eth_init(bd) < 0) {
 327                 eth_halt();
 328                 return(-1);
 329         }
 330
 331 restart:
 332 #ifdef CONFIG_NET_MULTI
 333         memcpy (NetOurEther, eth_get_dev()->enetaddr, 6);
 334 #else
 335         memcpy (NetOurEther, bd->bi_enetaddr, 6);
 336 #endif
 337
 338         NetState = NETLOOP_CONTINUE;
 339
 340         /*
 341          *      Start the ball rolling with the given start function.  From
 342          *      here on, this code is a state machine driven by received
 343          *      packets and timer events.
 344          */
 345
 346         switch (protocol) {
 347 #if defined(CONFIG_CMD_NFS)
 348         case NFS:
 349 #endif
 350 #if defined(CONFIG_CMD_PING)
 351         case PING:
 352 #endif
 353 #if defined(CONFIG_CMD_SNTP)
 354         case SNTP:
 355 #endif
 356         case NETCONS:
 357         case TFTP:
 358                 NetCopyIP(&NetOurIP, &bd->bi_ip_addr);
 359                 NetOurGatewayIP = getenv_IPaddr ("gatewayip");
 360                 NetOurSubnetMask= getenv_IPaddr ("netmask");
 361                 NetOurVLAN = getenv_VLAN("vlan");
 362                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 363
 364                 switch (protocol) {
 365 #if defined(CONFIG_CMD_NFS)
 366                 case NFS:
 367 #endif
 368                 case NETCONS:
 369                 case TFTP:
 370                         NetServerIP = getenv_IPaddr ("serverip");
 371                         break;
 372 #if defined(CONFIG_CMD_PING)
 373                 case PING:
 374                         /* nothing */
 375                         break;
 376 #endif
 377 #if defined(CONFIG_CMD_SNTP)
 378                 case SNTP:
 379                         /* nothing */
 380                         break;
 381 #endif
 382                 default:
 383                         break;
 384                 }
 385
 386                 break;
 387         case BOOTP:
 388         case RARP:
 389                 /*
 390                  * initialize our IP addr to 0 in order to accept ANY
 391                  * IP addr assigned to us by the BOOTP / RARP server
 392                  */
 393                 NetOurIP = 0;
 394                 NetServerIP = getenv_IPaddr ("serverip");
 395                 NetOurVLAN = getenv_VLAN("vlan");       /* VLANs must be read */
 396                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 397         case CDP:
 398                 NetOurVLAN = getenv_VLAN("vlan");       /* VLANs must be read */
 399                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 400                 break;
 401         default:
 402                 break;
 403         }
 404
 405         switch (net_check_prereq (protocol)) {
 406         case 1:
 407                 /* network not configured */
 408                 eth_halt();
 409                 return (-1);
 410
 411 #ifdef CONFIG_NET_MULTI
 412         case 2:
 413                 /* network device not configured */
 414                 break;
 415 #endif /* CONFIG_NET_MULTI */
 416
 417         case 0:
 418 #ifdef CONFIG_NET_MULTI
 419                 NetDevExists = 1;
 420 #endif
 421                 switch (protocol) {
 422                 case TFTP:
 423                         /* always use ARP to get server ethernet address */
 424                         TftpStart();
 425                         break;
 426
 427 #if defined(CONFIG_CMD_DHCP)
 428                 case DHCP:
 429                         /* Start with a clean slate... */
 430                         BootpTry = 0;
 431                         NetOurIP = 0;
 432                         NetServerIP = getenv_IPaddr ("serverip");
 433                         DhcpRequest();          /* Basically same as BOOTP */
 434                         break;
 435 #endif
 436
 437                 case BOOTP:
 438                         BootpTry = 0;
 439                         BootpRequest ();
 440                         break;
 441
 442                 case RARP:
 443                         RarpTry = 0;
 444                         RarpRequest ();
 445                         break;
 446 #if defined(CONFIG_CMD_PING)
 447                 case PING:
 448                         PingStart();
 449                         break;
 450 #endif
 451 #if defined(CONFIG_CMD_NFS)
 452                 case NFS:
 453                         NfsStart();
 454                         break;
 455 #endif
 456 #if defined(CONFIG_CMD_CDP)
 457                 case CDP:
 458                         CDPStart();
 459                         break;
 460 #endif
 461 #ifdef CONFIG_NETCONSOLE
 462                 case NETCONS:
 463                         NcStart();
 464                         break;
 465 #endif
 466 #if defined(CONFIG_CMD_SNTP)
 467                 case SNTP:
 468                         SntpStart();
 469                         break;
 470 #endif
 471                 default:
 472                         break;
 473                 }
 474
 475                 NetBootFileXferSize = 0;
 476                 break;
 477         }
 478
 479 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 480 #if defined(CFG_FAULT_ECHO_LINK_DOWN) && defined(CONFIG_STATUS_LED) && defined(STATUS_LED_RED)
 481         /*
 482          * Echo the inverted link state to the fault LED.
 483          */
 484         if(miiphy_link(eth_get_dev()->name, CFG_FAULT_MII_ADDR)) {
 485                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 486         } else {
 487                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 488         }
 489 #endif /* CFG_FAULT_ECHO_LINK_DOWN, ... */
 490 #endif /* CONFIG_MII, ... */
 491
 492         /*
 493          *      Main packet reception loop.  Loop receiving packets until
 494          *      someone sets `NetState' to a state that terminates.
 495          */
 496         for (;;) {
 497                 WATCHDOG_RESET();
 498 #ifdef CONFIG_SHOW_ACTIVITY
 499                 {
 500                         extern void show_activity(int arg);
 501                         show_activity(1);
 502                 }
 503 #endif
 504                 /*
 505                  *      Check the ethernet for a new packet.  The ethernet
 506                  *      receive routine will process it.
 507                  */
 508                 eth_rx();
 509
 510                 /*
 511                  *      Abort if ctrl-c was pressed.
 512                  */
 513                 if (ctrlc()) {
 514                         eth_halt();
 515                         puts ("\nAbort\n");
 516                         return (-1);
 517                 }
 518
 519                 ArpTimeoutCheck();
 520
 521                 /*
 522                  *      Check for a timeout, and run the timeout handler
 523                  *      if we have one.
 524                  */
 525                 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
 526                         thand_f *x;
 527
 528 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 529 #  if defined(CFG_FAULT_ECHO_LINK_DOWN) && \
 530       defined(CONFIG_STATUS_LED) &&        \
 531       defined(STATUS_LED_RED)
 532                         /*
 533                          * Echo the inverted link state to the fault LED.
 534                          */
 535                         if(miiphy_link(eth_get_dev()->name, CFG_FAULT_MII_ADDR)) {
 536                                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 537                         } else {
 538                                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 539                         }
 540 #  endif /* CFG_FAULT_ECHO_LINK_DOWN, ... */
 541 #endif /* CONFIG_MII, ... */
 542                         x = timeHandler;
 543                         timeHandler = (thand_f *)0;
 544                         (*x)();
 545                 }
 546
 547
 548                 switch (NetState) {
 549
 550                 case NETLOOP_RESTART:
 551 #ifdef CONFIG_NET_MULTI
 552                         NetRestarted = 1;
 553 #endif
 554                         goto restart;
 555
 556                 case NETLOOP_SUCCESS:
 557                         if (NetBootFileXferSize > 0) {
 558                                 char buf[20];
 559                                 printf("Bytes transferred = %ld (%lx hex)\n",
 560                                         NetBootFileXferSize,
 561                                         NetBootFileXferSize);
 562                                 sprintf(buf, "%lX", NetBootFileXferSize);
 563                                 setenv("filesize", buf);
 564
 565                                 sprintf(buf, "%lX", (unsigned long)load_addr);
 566                                 setenv("fileaddr", buf);
 567                         }
 568                         eth_halt();
 569                         return NetBootFileXferSize;
 570
 571                 case NETLOOP_FAIL:
 572                         return (-1);
 573                 }
 574         }
 575 }
 576
 577 /**********************************************************************/
 578
 579 static void
 580 startAgainTimeout(void)
 581 {
 582         NetState = NETLOOP_RESTART;
 583 }
 584
 585 static void
 586 startAgainHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
 587 {
 588         /* Totally ignore the packet */
 589 }
 590
 591 void NetStartAgain (void)
 592 {
 593         char *nretry;
 594         int noretry = 0, once = 0;
 595
 596         if ((nretry = getenv ("netretry")) != NULL) {
 597                 noretry = (strcmp (nretry, "no") == 0);
 598                 once = (strcmp (nretry, "once") == 0);
 599         }
 600         if (noretry) {
 601                 eth_halt ();
 602                 NetState = NETLOOP_FAIL;
 603                 return;
 604         }
 605 #ifndef CONFIG_NET_MULTI
 606         NetSetTimeout (10UL * CFG_HZ, startAgainTimeout);
 607         NetSetHandler (startAgainHandler);
 608 #else   /* !CONFIG_NET_MULTI*/
 609         eth_halt ();
 610 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
 611         eth_try_another (!NetRestarted);
 612 #endif
 613         eth_init (gd->bd);
 614         if (NetRestartWrap) {
 615                 NetRestartWrap = 0;
 616                 if (NetDevExists && !once) {
 617                         NetSetTimeout (10UL * CFG_HZ, startAgainTimeout);
 618                         NetSetHandler (startAgainHandler);
 619                 } else {
 620                         NetState = NETLOOP_FAIL;
 621                 }
 622         } else {
 623                 NetState = NETLOOP_RESTART;
 624         }
 625 #endif  /* CONFIG_NET_MULTI */
 626 }
 627
 628 /**********************************************************************/
 629 /*
 630  *      Miscelaneous bits.
 631  */
 632
 633 void
 634 NetSetHandler(rxhand_f * f)
 635 {
 636         packetHandler = f;
 637 }
 638
 639
 640 void
 641 NetSetTimeout(ulong iv, thand_f * f)
 642 {
 643         if (iv == 0) {
 644                 timeHandler = (thand_f *)0;
 645         } else {
 646                 timeHandler = f;
 647                 timeStart = get_timer(0);
 648                 timeDelta = iv;
 649         }
 650 }
 651
 652
 653 void
 654 NetSendPacket(volatile uchar * pkt, int len)
 655 {
 656         (void) eth_send(pkt, len);
 657 }
 658
 659 int
 660 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
 661 {
 662         uchar *pkt;
 663
 664         /* convert to new style broadcast */
 665         if (dest == 0)
 666                 dest = 0xFFFFFFFF;
 667
 668         /* if broadcast, make the ether address a broadcast and don't do ARP */
 669         if (dest == 0xFFFFFFFF)
 670                 ether = NetBcastAddr;
 671
 672         /* if MAC address was not discovered yet, save the packet and do an ARP request */
 673         if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
 674
 675 #ifdef ET_DEBUG
 676                 printf("sending ARP for %08lx\n", dest);
 677 #endif
 678                 NetArpWaitPacketIP = dest;
 679                 NetArpWaitPacketMAC = ether;
 680
 681                 pkt = NetArpWaitTxPacket;
 682                 pkt += NetSetEther (pkt, NetArpWaitPacketMAC, PROT_IP);
 683
 684                 NetSetIP (pkt, dest, dport, sport, len);
 685                 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len);
 686
 687                 /* size of the waiting packet */
 688                 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE + len;
 689
 690                 /* and do the ARP request */
 691                 NetArpWaitTry = 1;
 692                 NetArpWaitTimerStart = get_timer(0);
 693                 ArpRequest();
 694                 return 1;       /* waiting */
 695         }
 696
 697 #ifdef ET_DEBUG
 698         printf("sending UDP to %08lx/%02x:%02x:%02x:%02x:%02x:%02x\n",
 699                 dest, ether[0], ether[1], ether[2], ether[3], ether[4], ether[5]);
 700 #endif
 701
 702         pkt = (uchar *)NetTxPacket;
 703         pkt += NetSetEther (pkt, ether, PROT_IP);
 704         NetSetIP (pkt, dest, dport, sport, len);
 705         (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len);
 706
 707         return 0;       /* transmitted */
 708 }
 709
 710 #if defined(CONFIG_CMD_PING)
 711 static ushort PingSeqNo;
 712
 713 int PingSend(void)
 714 {
 715         static uchar mac[6];
 716         volatile IP_t *ip;
 717         volatile ushort *s;
 718         uchar *pkt;
 719
 720         /* XXX always send arp request */
 721
 722         memcpy(mac, NetEtherNullAddr, 6);
 723
 724 #ifdef ET_DEBUG
 725         printf("sending ARP for %08lx\n", NetPingIP);
 726 #endif
 727
 728         NetArpWaitPacketIP = NetPingIP;
 729         NetArpWaitPacketMAC = mac;
 730
 731         pkt = NetArpWaitTxPacket;
 732         pkt += NetSetEther(pkt, mac, PROT_IP);
 733
 734         ip = (volatile IP_t *)pkt;
 735
 736         /*
 737          *      Construct an IP and ICMP header.  (need to set no fragment bit - XXX)
 738          */
 739         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
 740         ip->ip_tos   = 0;
 741         ip->ip_len   = htons(IP_HDR_SIZE_NO_UDP + 8);
 742         ip->ip_id    = htons(NetIPID++);
 743         ip->ip_off   = htons(0x4000);   /* No fragmentation */
 744         ip->ip_ttl   = 255;
 745         ip->ip_p     = 0x01;            /* ICMP */
 746         ip->ip_sum   = 0;
 747         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
 748         NetCopyIP((void*)&ip->ip_dst, &NetPingIP);         /* - "" - */
 749         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
 750
 751         s = &ip->udp_src;               /* XXX ICMP starts here */
 752         s[0] = htons(0x0800);           /* echo-request, code */
 753         s[1] = 0;                       /* checksum */
 754         s[2] = 0;                       /* identifier */
 755         s[3] = htons(PingSeqNo++);      /* sequence number */
 756         s[1] = ~NetCksum((uchar *)s, 8/2);
 757
 758         /* size of the waiting packet */
 759         NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8;
 760
 761         /* and do the ARP request */
 762         NetArpWaitTry = 1;
 763         NetArpWaitTimerStart = get_timer(0);
 764         ArpRequest();
 765         return 1;       /* waiting */
 766 }
 767
 768 static void
 769 PingTimeout (void)
 770 {
 771         eth_halt();
 772         NetState = NETLOOP_FAIL;        /* we did not get the reply */
 773 }
 774
 775 static void
 776 PingHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
 777 {
 778         IPaddr_t tmp;
 779         volatile IP_t *ip = (volatile IP_t *)pkt;
 780
 781         tmp = NetReadIP((void *)&ip->ip_src);
 782         if (tmp != NetPingIP)
 783                 return;
 784
 785         NetState = NETLOOP_SUCCESS;
 786 }
 787
 788 static void PingStart(void)
 789 {
 790 #if defined(CONFIG_NET_MULTI)
 791         printf ("Using %s device\n", eth_get_name());
 792 #endif  /* CONFIG_NET_MULTI */
 793         NetSetTimeout (10UL * CFG_HZ, PingTimeout);
 794         NetSetHandler (PingHandler);
 795
 796         PingSend();
 797 }
 798 #endif
 799
 800 #if defined(CONFIG_CMD_CDP)
 801
 802 #define CDP_DEVICE_ID_TLV               0x0001
 803 #define CDP_ADDRESS_TLV                 0x0002
 804 #define CDP_PORT_ID_TLV                 0x0003
 805 #define CDP_CAPABILITIES_TLV            0x0004
 806 #define CDP_VERSION_TLV                 0x0005
 807 #define CDP_PLATFORM_TLV                0x0006
 808 #define CDP_NATIVE_VLAN_TLV             0x000a
 809 #define CDP_APPLIANCE_VLAN_TLV          0x000e
 810 #define CDP_TRIGGER_TLV                 0x000f
 811 #define CDP_POWER_CONSUMPTION_TLV       0x0010
 812 #define CDP_SYSNAME_TLV                 0x0014
 813 #define CDP_SYSOBJECT_TLV               0x0015
 814 #define CDP_MANAGEMENT_ADDRESS_TLV      0x0016
 815
 816 #define CDP_TIMEOUT                     (CFG_HZ/4)      /* one packet every 250ms */
 817
 818 static int CDPSeq;
 819 static int CDPOK;
 820
 821 ushort CDPNativeVLAN;
 822 ushort CDPApplianceVLAN;
 823
 824 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 0x00 };
 825
 826 static ushort CDP_compute_csum(const uchar *buff, ushort len)
 827 {
 828         ushort csum;
 829         int     odd;
 830         ulong   result = 0;
 831         ushort  leftover;
 832         ushort *p;
 833
 834         if (len > 0) {
 835                 odd = 1 & (ulong)buff;
 836                 if (odd) {
 837                         result = *buff << 8;
 838                         len--;
 839                         buff++;
 840                 }
 841                 while (len > 1) {
 842                         p = (ushort *)buff;
 843                         result += *p++;
 844                         buff = (uchar *)p;
 845                         if (result & 0x80000000)
 846                                 result = (result & 0xFFFF) + (result >> 16);
 847                         len -= 2;
 848                 }
 849                 if (len) {
 850                         leftover = (signed short)(*(const signed char *)buff);
 851                         /* CISCO SUCKS big time! (and blows too):
 852                          * CDP uses the IP checksum algorithm with a twist;
 853                          * for the last byte it *sign* extends and sums.
 854                          */
 855                         result = (result & 0xffff0000) | ((result + leftover) & 0x0000ffff);
 856                 }
 857                 while (result >> 16)
 858                         result = (result & 0xFFFF) + (result >> 16);
 859
 860                 if (odd)
 861                         result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
 862         }
 863
 864         /* add up 16-bit and 17-bit words for 17+c bits */
 865         result = (result & 0xffff) + (result >> 16);
 866         /* add up 16-bit and 2-bit for 16+c bit */
 867         result = (result & 0xffff) + (result >> 16);
 868         /* add up carry.. */
 869         result = (result & 0xffff) + (result >> 16);
 870
 871         /* negate */
 872         csum = ~(ushort)result;
 873
 874         /* run time endian detection */
 875         if (csum != htons(csum))        /* little endian */
 876                 csum = htons(csum);
 877
 878         return csum;
 879 }
 880
 881 int CDPSendTrigger(void)
 882 {
 883         volatile uchar *pkt;
 884         volatile ushort *s;
 885         volatile ushort *cp;
 886         Ethernet_t *et;
 887         int len;
 888         ushort chksum;
 889 #if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID)   || \
 890     defined(CONFIG_CDP_VERSION)   || defined(CONFIG_CDP_PLATFORM)
 891         char buf[32];
 892 #endif
 893
 894         pkt = NetTxPacket;
 895         et = (Ethernet_t *)pkt;
 896
 897         /* NOTE: trigger sent not on any VLAN */
 898
 899         /* form ethernet header */
 900         memcpy(et->et_dest, NetCDPAddr, 6);
 901         memcpy(et->et_src, NetOurEther, 6);
 902
 903         pkt += ETHER_HDR_SIZE;
 904
 905         /* SNAP header */
 906         memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr));
 907         pkt += sizeof(CDP_SNAP_hdr);
 908
 909         /* CDP header */
 910         *pkt++ = 0x02;                          /* CDP version 2 */
 911         *pkt++ = 180;                           /* TTL */
 912         s = (volatile ushort *)pkt;
 913         cp = s;
 914         *s++ = htons(0);                        /* checksum (0 for later calculation) */
 915
 916         /* CDP fields */
 917 #ifdef CONFIG_CDP_DEVICE_ID
 918         *s++ = htons(CDP_DEVICE_ID_TLV);
 919         *s++ = htons(CONFIG_CDP_DEVICE_ID);
 920         memset(buf, 0, sizeof(buf));
 921         sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%02X%02X%02X%02X%02X%02X",
 922                 NetOurEther[0] & 0xff, NetOurEther[1] & 0xff,
 923                 NetOurEther[2] & 0xff, NetOurEther[3] & 0xff,
 924                 NetOurEther[4] & 0xff, NetOurEther[5] & 0xff);
 925         memcpy((uchar *)s, buf, 16);
 926         s += 16 / 2;
 927 #endif
 928
 929 #ifdef CONFIG_CDP_PORT_ID
 930         *s++ = htons(CDP_PORT_ID_TLV);
 931         memset(buf, 0, sizeof(buf));
 932         sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index());
 933         len = strlen(buf);
 934         if (len & 1)    /* make it even */
 935                 len++;
 936         *s++ = htons(len + 4);
 937         memcpy((uchar *)s, buf, len);
 938         s += len / 2;
 939 #endif
 940
 941 #ifdef CONFIG_CDP_CAPABILITIES
 942         *s++ = htons(CDP_CAPABILITIES_TLV);
 943         *s++ = htons(8);
 944         *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES);
 945         s += 2;
 946 #endif
 947
 948 #ifdef CONFIG_CDP_VERSION
 949         *s++ = htons(CDP_VERSION_TLV);
 950         memset(buf, 0, sizeof(buf));
 951         strcpy(buf, CONFIG_CDP_VERSION);
 952         len = strlen(buf);
 953         if (len & 1)    /* make it even */
 954                 len++;
 955         *s++ = htons(len + 4);
 956         memcpy((uchar *)s, buf, len);
 957         s += len / 2;
 958 #endif
 959
 960 #ifdef CONFIG_CDP_PLATFORM
 961         *s++ = htons(CDP_PLATFORM_TLV);
 962         memset(buf, 0, sizeof(buf));
 963         strcpy(buf, CONFIG_CDP_PLATFORM);
 964         len = strlen(buf);
 965         if (len & 1)    /* make it even */
 966                 len++;
 967         *s++ = htons(len + 4);
 968         memcpy((uchar *)s, buf, len);
 969         s += len / 2;
 970 #endif
 971
 972 #ifdef CONFIG_CDP_TRIGGER
 973         *s++ = htons(CDP_TRIGGER_TLV);
 974         *s++ = htons(8);
 975         *(ulong *)s = htonl(CONFIG_CDP_TRIGGER);
 976         s += 2;
 977 #endif
 978
 979 #ifdef CONFIG_CDP_POWER_CONSUMPTION
 980         *s++ = htons(CDP_POWER_CONSUMPTION_TLV);
 981         *s++ = htons(6);
 982         *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION);
 983 #endif
 984
 985         /* length of ethernet packet */
 986         len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE);
 987         et->et_protlen = htons(len);
 988
 989         len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr);
 990         chksum = CDP_compute_csum((uchar *)NetTxPacket + len, (uchar *)s - (NetTxPacket + len));
 991         if (chksum == 0)
 992                 chksum = 0xFFFF;
 993         *cp = htons(chksum);
 994
 995         (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket);
 996         return 0;
 997 }
 998
 999 static void
1000 CDPTimeout (void)
1001 {
1002         CDPSeq++;
1003
1004         if (CDPSeq < 3) {
1005                 NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
1006                 CDPSendTrigger();
1007                 return;
1008         }
1009
1010         /* if not OK try again */
1011         if (!CDPOK)
1012                 NetStartAgain();
1013         else
1014                 NetState = NETLOOP_SUCCESS;
1015 }
1016
1017 static void
1018 CDPDummyHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
1019 {
1020         /* nothing */
1021 }
1022
1023 static void
1024 CDPHandler(const uchar * pkt, unsigned len)
1025 {
1026         const uchar *t;
1027         const ushort *ss;
1028         ushort type, tlen;
1029         uchar applid;
1030         ushort vlan, nvlan;
1031
1032         /* minimum size? */
1033         if (len < sizeof(CDP_SNAP_hdr) + 4)
1034                 goto pkt_short;
1035
1036         /* check for valid CDP SNAP header */
1037         if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0)
1038                 return;
1039
1040         pkt += sizeof(CDP_SNAP_hdr);
1041         len -= sizeof(CDP_SNAP_hdr);
1042
1043         /* Version of CDP protocol must be >= 2 and TTL != 0 */
1044         if (pkt[0] < 0x02 || pkt[1] == 0)
1045                 return;
1046
1047         /* if version is greater than 0x02 maybe we'll have a problem; output a warning */
1048         if (pkt[0] != 0x02)
1049                 printf("** WARNING: CDP packet received with a protocol version %d > 2\n",
1050                                 pkt[0] & 0xff);
1051
1052         if (CDP_compute_csum(pkt, len) != 0)
1053                 return;
1054
1055         pkt += 4;
1056         len -= 4;
1057
1058         vlan = htons(-1);
1059         nvlan = htons(-1);
1060         while (len > 0) {
1061                 if (len < 4)
1062                         goto pkt_short;
1063
1064                 ss = (const ushort *)pkt;
1065                 type = ntohs(ss[0]);
1066                 tlen = ntohs(ss[1]);
1067                 if (tlen > len) {
1068                         goto pkt_short;
1069                 }
1070
1071                 pkt += tlen;
1072                 len -= tlen;
1073
1074                 ss += 2;        /* point ss to the data of the TLV */
1075                 tlen -= 4;
1076
1077                 switch (type) {
1078                         case CDP_DEVICE_ID_TLV:
1079                                 break;
1080                         case CDP_ADDRESS_TLV:
1081                                 break;
1082                         case CDP_PORT_ID_TLV:
1083                                 break;
1084                         case CDP_CAPABILITIES_TLV:
1085                                 break;
1086                         case CDP_VERSION_TLV:
1087                                 break;
1088                         case CDP_PLATFORM_TLV:
1089                                 break;
1090                         case CDP_NATIVE_VLAN_TLV:
1091                                 nvlan = *ss;
1092                                 break;
1093                         case CDP_APPLIANCE_VLAN_TLV:
1094                                 t = (const uchar *)ss;
1095                                 while (tlen > 0) {
1096                                         if (tlen < 3)
1097                                                 goto pkt_short;
1098
1099                                         applid = t[0];
1100                                         ss = (const ushort *)(t + 1);
1101
1102 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE
1103                                         if (applid == CONFIG_CDP_APPLIANCE_VLAN_TYPE)
1104                                                 vlan = *ss;
1105 #else
1106                                         vlan = ntohs(*ss);      /* XXX will this work; dunno */
1107 #endif
1108                                         t += 3; tlen -= 3;
1109                                 }
1110                                 break;
1111                         case CDP_TRIGGER_TLV:
1112                                 break;
1113                         case CDP_POWER_CONSUMPTION_TLV:
1114                                 break;
1115                         case CDP_SYSNAME_TLV:
1116                                 break;
1117                         case CDP_SYSOBJECT_TLV:
1118                                 break;
1119                         case CDP_MANAGEMENT_ADDRESS_TLV:
1120                                 break;
1121                 }
1122         }
1123
1124         CDPApplianceVLAN = vlan;
1125         CDPNativeVLAN = nvlan;
1126
1127         CDPOK = 1;
1128         return;
1129
1130  pkt_short:
1131         printf("** CDP packet is too short\n");
1132         return;
1133 }
1134
1135 static void CDPStart(void)
1136 {
1137 #if defined(CONFIG_NET_MULTI)
1138         printf ("Using %s device\n", eth_get_name());
1139 #endif
1140         CDPSeq = 0;
1141         CDPOK = 0;
1142
1143         CDPNativeVLAN = htons(-1);
1144         CDPApplianceVLAN = htons(-1);
1145
1146         NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
1147         NetSetHandler (CDPDummyHandler);
1148
1149         CDPSendTrigger();
1150 }
1151 #endif
1152
1153
1154 void
1155 NetReceive(volatile uchar * inpkt, int len)
1156 {
1157         Ethernet_t *et;
1158         IP_t    *ip;
1159         ARP_t   *arp;
1160         IPaddr_t tmp;
1161         int     x;
1162         uchar *pkt;
1163 #if defined(CONFIG_CMD_CDP)
1164         int iscdp;
1165 #endif
1166         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1167
1168 #ifdef ET_DEBUG
1169         printf("packet received\n");
1170 #endif
1171
1172         NetRxPkt = inpkt;
1173         NetRxPktLen = len;
1174         et = (Ethernet_t *)inpkt;
1175
1176         /* too small packet? */
1177         if (len < ETHER_HDR_SIZE)
1178                 return;
1179
1180 #ifdef CONFIG_API
1181         if (push_packet) {
1182                 (*push_packet)(inpkt, len);
1183                 return;
1184         }
1185 #endif
1186
1187 #if defined(CONFIG_CMD_CDP)
1188         /* keep track if packet is CDP */
1189         iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0;
1190 #endif
1191
1192         myvlanid = ntohs(NetOurVLAN);
1193         if (myvlanid == (ushort)-1)
1194                 myvlanid = VLAN_NONE;
1195         mynvlanid = ntohs(NetOurNativeVLAN);
1196         if (mynvlanid == (ushort)-1)
1197                 mynvlanid = VLAN_NONE;
1198
1199         x = ntohs(et->et_protlen);
1200
1201 #ifdef ET_DEBUG
1202         printf("packet received\n");
1203 #endif
1204
1205         if (x < 1514) {
1206                 /*
1207                  *      Got a 802 packet.  Check the other protocol field.
1208                  */
1209                 x = ntohs(et->et_prot);
1210
1211                 ip = (IP_t *)(inpkt + E802_HDR_SIZE);
1212                 len -= E802_HDR_SIZE;
1213
1214         } else if (x != PROT_VLAN) {    /* normal packet */
1215                 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE);
1216                 len -= ETHER_HDR_SIZE;
1217
1218         } else {                        /* VLAN packet */
1219                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et;
1220
1221 #ifdef ET_DEBUG
1222                 printf("VLAN packet received\n");
1223 #endif
1224                 /* too small packet? */
1225                 if (len < VLAN_ETHER_HDR_SIZE)
1226                         return;
1227
1228                 /* if no VLAN active */
1229                 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
1230 #if defined(CONFIG_CMD_CDP)
1231                                 && iscdp == 0
1232 #endif
1233                                 )
1234                         return;
1235
1236                 cti = ntohs(vet->vet_tag);
1237                 vlanid = cti & VLAN_IDMASK;
1238                 x = ntohs(vet->vet_type);
1239
1240                 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE);
1241                 len -= VLAN_ETHER_HDR_SIZE;
1242         }
1243
1244 #ifdef ET_DEBUG
1245         printf("Receive from protocol 0x%x\n", x);
1246 #endif
1247
1248 #if defined(CONFIG_CMD_CDP)
1249         if (iscdp) {
1250                 CDPHandler((uchar *)ip, len);
1251                 return;
1252         }
1253 #endif
1254
1255         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1256                 if (vlanid == VLAN_NONE)
1257                         vlanid = (mynvlanid & VLAN_IDMASK);
1258                 /* not matched? */
1259                 if (vlanid != (myvlanid & VLAN_IDMASK))
1260                         return;
1261         }
1262
1263         switch (x) {
1264
1265         case PROT_ARP:
1266                 /*
1267                  * We have to deal with two types of ARP packets:
1268                  * - REQUEST packets will be answered by sending  our
1269                  *   IP address - if we know it.
1270                  * - REPLY packates are expected only after we asked
1271                  *   for the TFTP server's or the gateway's ethernet
1272                  *   address; so if we receive such a packet, we set
1273                  *   the server ethernet address
1274                  */
1275 #ifdef ET_DEBUG
1276                 puts ("Got ARP\n");
1277 #endif
1278                 arp = (ARP_t *)ip;
1279                 if (len < ARP_HDR_SIZE) {
1280                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1281                         return;
1282                 }
1283                 if (ntohs(arp->ar_hrd) != ARP_ETHER) {
1284                         return;
1285                 }
1286                 if (ntohs(arp->ar_pro) != PROT_IP) {
1287                         return;
1288                 }
1289                 if (arp->ar_hln != 6) {
1290                         return;
1291                 }
1292                 if (arp->ar_pln != 4) {
1293                         return;
1294                 }
1295
1296                 if (NetOurIP == 0) {
1297                         return;
1298                 }
1299
1300                 if (NetReadIP(&arp->ar_data[16]) != NetOurIP) {
1301                         return;
1302                 }
1303
1304                 switch (ntohs(arp->ar_op)) {
1305                 case ARPOP_REQUEST:             /* reply with our IP address    */
1306 #ifdef ET_DEBUG
1307                         puts ("Got ARP REQUEST, return our IP\n");
1308 #endif
1309                         pkt = (uchar *)et;
1310                         pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
1311                         arp->ar_op = htons(ARPOP_REPLY);
1312                         memcpy   (&arp->ar_data[10], &arp->ar_data[0], 6);
1313                         NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
1314                         memcpy   (&arp->ar_data[ 0], NetOurEther, 6);
1315                         NetCopyIP(&arp->ar_data[ 6], &NetOurIP);
1316                         (void) eth_send((uchar *)et, (pkt - (uchar *)et) + ARP_HDR_SIZE);
1317                         return;
1318
1319                 case ARPOP_REPLY:               /* arp reply */
1320                         /* are we waiting for a reply */
1321                         if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
1322                                 break;
1323 #ifdef ET_DEBUG
1324                         printf("Got ARP REPLY, set server/gtwy eth addr (%02x:%02x:%02x:%02x:%02x:%02x)\n",
1325                                 arp->ar_data[0], arp->ar_data[1],
1326                                 arp->ar_data[2], arp->ar_data[3],
1327                                 arp->ar_data[4], arp->ar_data[5]);
1328 #endif
1329
1330                         tmp = NetReadIP(&arp->ar_data[6]);
1331
1332                         /* matched waiting packet's address */
1333                         if (tmp == NetArpWaitReplyIP) {
1334 #ifdef ET_DEBUG
1335                                 puts ("Got it\n");
1336 #endif
1337                                 /* save address for later use */
1338                                 memcpy(NetArpWaitPacketMAC, &arp->ar_data[0], 6);
1339
1340 #ifdef CONFIG_NETCONSOLE
1341                                 (*packetHandler)(0,0,0,0);
1342 #endif
1343                                 /* modify header, and transmit it */
1344                                 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6);
1345                                 (void) eth_send(NetArpWaitTxPacket, NetArpWaitTxPacketSize);
1346
1347                                 /* no arp request pending now */
1348                                 NetArpWaitPacketIP = 0;
1349                                 NetArpWaitTxPacketSize = 0;
1350                                 NetArpWaitPacketMAC = NULL;
1351
1352                         }
1353                         return;
1354                 default:
1355 #ifdef ET_DEBUG
1356                         printf("Unexpected ARP opcode 0x%x\n", ntohs(arp->ar_op));
1357 #endif
1358                         return;
1359                 }
1360                 break;
1361
1362         case PROT_RARP:
1363 #ifdef ET_DEBUG
1364                 puts ("Got RARP\n");
1365 #endif
1366                 arp = (ARP_t *)ip;
1367                 if (len < ARP_HDR_SIZE) {
1368                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1369                         return;
1370                 }
1371
1372                 if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
1373                         (ntohs(arp->ar_hrd) != ARP_ETHER)   ||
1374                         (ntohs(arp->ar_pro) != PROT_IP)     ||
1375                         (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
1376
1377                         puts ("invalid RARP header\n");
1378                 } else {
1379                         NetCopyIP(&NetOurIP,    &arp->ar_data[16]);
1380                         if (NetServerIP == 0)
1381                                 NetCopyIP(&NetServerIP, &arp->ar_data[ 6]);
1382                         memcpy (NetServerEther, &arp->ar_data[ 0], 6);
1383
1384                         (*packetHandler)(0,0,0,0);
1385                 }
1386                 break;
1387
1388         case PROT_IP:
1389 #ifdef ET_DEBUG
1390                 puts ("Got IP\n");
1391 #endif
1392                 if (len < IP_HDR_SIZE) {
1393                         debug ("len bad %d < %d\n", len, IP_HDR_SIZE);
1394                         return;
1395                 }
1396                 if (len < ntohs(ip->ip_len)) {
1397                         printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
1398                         return;
1399                 }
1400                 len = ntohs(ip->ip_len);
1401 #ifdef ET_DEBUG
1402                 printf("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
1403 #endif
1404                 if ((ip->ip_hl_v & 0xf0) != 0x40) {
1405                         return;
1406                 }
1407                 if (ip->ip_off & htons(0x1fff)) { /* Can't deal w/ fragments */
1408                         return;
1409                 }
1410                 /* can't deal with headers > 20 bytes */
1411                 if ((ip->ip_hl_v & 0x0f) > 0x05) {
1412                         return;
1413                 }
1414                 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
1415                         puts ("checksum bad\n");
1416                         return;
1417                 }
1418                 tmp = NetReadIP(&ip->ip_dst);
1419                 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
1420 #ifdef CONFIG_MCAST_TFTP
1421                         if (Mcast_addr != tmp)
1422 #endif
1423                         return;
1424                 }
1425                 /*
1426                  * watch for ICMP host redirects
1427                  *
1428                  * There is no real handler code (yet). We just watch
1429                  * for ICMP host redirect messages. In case anybody
1430                  * sees these messages: please contact me
1431                  * (wd@denx.de), or - even better - send me the
1432                  * necessary fixes :-)
1433                  *
1434                  * Note: in all cases where I have seen this so far
1435                  * it was a problem with the router configuration,
1436                  * for instance when a router was configured in the
1437                  * BOOTP reply, but the TFTP server was on the same
1438                  * subnet. So this is probably a warning that your
1439                  * configuration might be wrong. But I'm not really
1440                  * sure if there aren't any other situations.
1441                  */
1442                 if (ip->ip_p == IPPROTO_ICMP) {
1443                         ICMP_t *icmph = (ICMP_t *)&(ip->udp_src);
1444
1445                         switch (icmph->type) {
1446                         case ICMP_REDIRECT:
1447                                 if (icmph->code != ICMP_REDIR_HOST)
1448                                         return;
1449                                 puts (" ICMP Host Redirect to ");
1450                                 print_IPaddr(icmph->un.gateway);
1451                                 putc(' ');
1452                                 return;
1453 #if defined(CONFIG_CMD_PING)
1454                         case ICMP_ECHO_REPLY:
1455                                 /*
1456                                  *      IP header OK.  Pass the packet to the current handler.
1457                                  */
1458                                 /* XXX point to ip packet */
1459                                 (*packetHandler)((uchar *)ip, 0, 0, 0);
1460                                 return;
1461                         case ICMP_ECHO_REQUEST:
1462 #ifdef ET_DEBUG
1463                                 printf ("Got ICMP ECHO REQUEST, return %d bytes \n",
1464                                         ETHER_HDR_SIZE + len);
1465 #endif
1466                                 memcpy (&et->et_dest[0], &et->et_src[0], 6);
1467                                 memcpy (&et->et_src[ 0], NetOurEther, 6);
1468
1469                                 ip->ip_sum = 0;
1470                                 ip->ip_off = 0;
1471                                 NetCopyIP((void*)&ip->ip_dst, &ip->ip_src);
1472                                 NetCopyIP((void*)&ip->ip_src, &NetOurIP);
1473                                 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP >> 1);
1474
1475                                 icmph->type = ICMP_ECHO_REPLY;
1476                                 icmph->checksum = 0;
1477                                 icmph->checksum = ~NetCksum((uchar *)icmph,
1478                                                 (len - IP_HDR_SIZE_NO_UDP) >> 1);
1479                                 (void) eth_send((uchar *)et, ETHER_HDR_SIZE + len);
1480                                 return;
1481 #endif
1482                         default:
1483                                 return;
1484                         }
1485                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1486                         return;
1487                 }
1488
1489 #ifdef CONFIG_UDP_CHECKSUM
1490                 if (ip->udp_xsum != 0) {
1491                         ulong   xsum;
1492                         ushort *sumptr;
1493                         ushort  sumlen;
1494
1495                         xsum  = ip->ip_p;
1496                         xsum += (ntohs(ip->udp_len));
1497                         xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
1498                         xsum += (ntohl(ip->ip_src) >>  0) & 0x0000ffff;
1499                         xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
1500                         xsum += (ntohl(ip->ip_dst) >>  0) & 0x0000ffff;
1501
1502                         sumlen = ntohs(ip->udp_len);
1503                         sumptr = (ushort *) &(ip->udp_src);
1504
1505                         while (sumlen > 1) {
1506                                 ushort sumdata;
1507
1508                                 sumdata = *sumptr++;
1509                                 xsum += ntohs(sumdata);
1510                                 sumlen -= 2;
1511                         }
1512                         if (sumlen > 0) {
1513                                 ushort sumdata;
1514
1515                                 sumdata = *(unsigned char *) sumptr;
1516                                 sumdata = (sumdata << 8) & 0xff00;
1517                                 xsum += sumdata;
1518                         }
1519                         while ((xsum >> 16) != 0) {
1520                                 xsum = (xsum & 0x0000ffff) + ((xsum >> 16) & 0x0000ffff);
1521                         }
1522                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1523                                 printf(" UDP wrong checksum %08x %08x\n", xsum, ntohs(ip->udp_xsum));
1524                                 return;
1525                         }
1526                 }
1527 #endif
1528
1529
1530 #ifdef CONFIG_NETCONSOLE
1531                 nc_input_packet((uchar *)ip +IP_HDR_SIZE,
1532                                                 ntohs(ip->udp_dst),
1533                                                 ntohs(ip->udp_src),
1534                                                 ntohs(ip->udp_len) - 8);
1535 #endif
1536                 /*
1537                  *      IP header OK.  Pass the packet to the current handler.
1538                  */
1539                 (*packetHandler)((uchar *)ip +IP_HDR_SIZE,
1540                                                 ntohs(ip->udp_dst),
1541                                                 ntohs(ip->udp_src),
1542                                                 ntohs(ip->udp_len) - 8);
1543                 break;
1544         }
1545 }
1546
1547
1548 /**********************************************************************/
1549
1550 static int net_check_prereq (proto_t protocol)
1551 {
1552         switch (protocol) {
1553                 /* Fall through */
1554 #if defined(CONFIG_CMD_PING)
1555         case PING:
1556                 if (NetPingIP == 0) {
1557                         puts ("*** ERROR: ping address not given\n");
1558                         return (1);
1559                 }
1560                 goto common;
1561 #endif
1562 #if defined(CONFIG_CMD_SNTP)
1563         case SNTP:
1564                 if (NetNtpServerIP == 0) {
1565                         puts ("*** ERROR: NTP server address not given\n");
1566                         return (1);
1567                 }
1568                 goto common;
1569 #endif
1570 #if defined(CONFIG_CMD_NFS)
1571         case NFS:
1572 #endif
1573         case NETCONS:
1574         case TFTP:
1575                 if (NetServerIP == 0) {
1576                         puts ("*** ERROR: `serverip' not set\n");
1577                         return (1);
1578                 }
1579 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP)
1580     common:
1581 #endif
1582
1583                 if (NetOurIP == 0) {
1584                         puts ("*** ERROR: `ipaddr' not set\n");
1585                         return (1);
1586                 }
1587                 /* Fall through */
1588
1589         case DHCP:
1590         case RARP:
1591         case BOOTP:
1592         case CDP:
1593                 if (memcmp (NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
1594 #ifdef CONFIG_NET_MULTI
1595                         extern int eth_get_dev_index (void);
1596                         int num = eth_get_dev_index ();
1597
1598                         switch (num) {
1599                         case -1:
1600                                 puts ("*** ERROR: No ethernet found.\n");
1601                                 return (1);
1602                         case 0:
1603                                 puts ("*** ERROR: `ethaddr' not set\n");
1604                                 break;
1605                         default:
1606                                 printf ("*** ERROR: `eth%daddr' not set\n",
1607                                         num);
1608                                 break;
1609                         }
1610
1611                         NetStartAgain ();
1612                         return (2);
1613 #else
1614                         puts ("*** ERROR: `ethaddr' not set\n");
1615                         return (1);
1616 #endif
1617                 }
1618                 /* Fall through */
1619         default:
1620                 return (0);
1621         }
1622         return (0);             /* OK */
1623 }
1624 /**********************************************************************/
1625
1626 int
1627 NetCksumOk(uchar * ptr, int len)
1628 {
1629         return !((NetCksum(ptr, len) + 1) & 0xfffe);
1630 }
1631
1632
1633 unsigned
1634 NetCksum(uchar * ptr, int len)
1635 {
1636         ulong   xsum;
1637         ushort *p = (ushort *)ptr;
1638
1639         xsum = 0;
1640         while (len-- > 0)
1641                 xsum += *p++;
1642         xsum = (xsum & 0xffff) + (xsum >> 16);
1643         xsum = (xsum & 0xffff) + (xsum >> 16);
1644         return (xsum & 0xffff);
1645 }
1646
1647 int
1648 NetEthHdrSize(void)
1649 {
1650         ushort myvlanid;
1651
1652         myvlanid = ntohs(NetOurVLAN);
1653         if (myvlanid == (ushort)-1)
1654                 myvlanid = VLAN_NONE;
1655
1656         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : VLAN_ETHER_HDR_SIZE;
1657 }
1658
1659 int
1660 NetSetEther(volatile uchar * xet, uchar * addr, uint prot)
1661 {
1662         Ethernet_t *et = (Ethernet_t *)xet;
1663         ushort myvlanid;
1664
1665         myvlanid = ntohs(NetOurVLAN);
1666         if (myvlanid == (ushort)-1)
1667                 myvlanid = VLAN_NONE;
1668
1669         memcpy (et->et_dest, addr, 6);
1670         memcpy (et->et_src, NetOurEther, 6);
1671         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1672         et->et_protlen = htons(prot);
1673                 return ETHER_HDR_SIZE;
1674         } else {
1675                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet;
1676
1677                 vet->vet_vlan_type = htons(PROT_VLAN);
1678                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1679                 vet->vet_type = htons(prot);
1680                 return VLAN_ETHER_HDR_SIZE;
1681         }
1682 }
1683
1684 void
1685 NetSetIP(volatile uchar * xip, IPaddr_t dest, int dport, int sport, int len)
1686 {
1687         volatile IP_t *ip = (IP_t *)xip;
1688
1689         /*
1690          *      If the data is an odd number of bytes, zero the
1691          *      byte after the last byte so that the checksum
1692          *      will work.
1693          */
1694         if (len & 1)
1695                 xip[IP_HDR_SIZE + len] = 0;
1696
1697         /*
1698          *      Construct an IP and UDP header.
1699          *      (need to set no fragment bit - XXX)
1700          */
1701         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
1702         ip->ip_tos   = 0;
1703         ip->ip_len   = htons(IP_HDR_SIZE + len);
1704         ip->ip_id    = htons(NetIPID++);
1705         ip->ip_off   = htons(0x4000);   /* No fragmentation */
1706         ip->ip_ttl   = 255;
1707         ip->ip_p     = 17;              /* UDP */
1708         ip->ip_sum   = 0;
1709         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
1710         NetCopyIP((void*)&ip->ip_dst, &dest);      /* - "" - */
1711         ip->udp_src  = htons(sport);
1712         ip->udp_dst  = htons(dport);
1713         ip->udp_len  = htons(8 + len);
1714         ip->udp_xsum = 0;
1715         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
1716 }
1717
1718 void copy_filename (char *dst, char *src, int size)
1719 {
1720         if (*src && (*src == '"')) {
1721                 ++src;
1722                 --size;
1723         }
1724
1725         while ((--size > 0) && *src && (*src != '"')) {
1726                 *dst++ = *src++;
1727         }
1728         *dst = '\0';
1729 }
1730
1731 #endif
1732
1733 void ip_to_string (IPaddr_t x, char *s)
1734 {
1735         x = ntohl (x);
1736         sprintf (s, "%d.%d.%d.%d",
1737                  (int) ((x >> 24) & 0xff),
1738                  (int) ((x >> 16) & 0xff),
1739                  (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
1740         );
1741 }
1742
1743 IPaddr_t string_to_ip(char *s)
1744 {
1745         IPaddr_t addr;
1746         char *e;
1747         int i;
1748
1749         if (s == NULL)
1750                 return(0);
1751
1752         for (addr=0, i=0; i<4; ++i) {
1753                 ulong val = s ? simple_strtoul(s, &e, 10) : 0;
1754                 addr <<= 8;
1755                 addr |= (val & 0xFF);
1756                 if (s) {
1757                         s = (*e) ? e+1 : e;
1758                 }
1759         }
1760
1761         return (htonl(addr));
1762 }
1763
1764 void VLAN_to_string(ushort x, char *s)
1765 {
1766         x = ntohs(x);
1767
1768         if (x == (ushort)-1)
1769                 x = VLAN_NONE;
1770
1771         if (x == VLAN_NONE)
1772                 strcpy(s, "none");
1773         else
1774                 sprintf(s, "%d", x & VLAN_IDMASK);
1775 }
1776
1777 ushort string_to_VLAN(char *s)
1778 {
1779         ushort id;
1780
1781         if (s == NULL)
1782                 return htons(VLAN_NONE);
1783
1784         if (*s < '0' || *s > '9')
1785                 id = VLAN_NONE;
1786         else
1787                 id = (ushort)simple_strtoul(s, NULL, 10);
1788
1789         return htons(id);
1790 }
1791
1792 void print_IPaddr (IPaddr_t x)
1793 {
1794         char tmp[16];
1795
1796         ip_to_string (x, tmp);
1797
1798         puts (tmp);
1799 }
1800
1801 IPaddr_t getenv_IPaddr (char *var)
1802 {
1803         return (string_to_ip(getenv(var)));
1804 }
1805
1806 ushort getenv_VLAN(char *var)
1807 {
1808         return (string_to_VLAN(getenv(var)));
1809 }