net/net.c

   1 /*
   2  *      Copied from Linux Monitor (LiMon) - Networking.
   3  *
   4  *      Copyright 1994 - 2000 Neil Russell.
   5  *      (See License)
   6  *      Copyright 2000 Roland Borde
   7  *      Copyright 2000 Paolo Scaffardi
   8  *      Copyright 2000-2002 Wolfgang Denk, wd@denx.de
   9  */
  10
  11 /*
  12  * General Desription:
  13  *
  14  * The user interface supports commands for BOOTP, RARP, and TFTP.
  15  * Also, we support ARP internally. Depending on available data,
  16  * these interact as follows:
  17  *
  18  * BOOTP:
  19  *
  20  *      Prerequisites:  - own ethernet address
  21  *      We want:        - own IP address
  22  *                      - TFTP server IP address
  23  *                      - name of bootfile
  24  *      Next step:      ARP
  25  *
  26  * RARP:
  27  *
  28  *      Prerequisites:  - own ethernet address
  29  *      We want:        - own IP address
  30  *                      - TFTP server IP address
  31  *      Next step:      ARP
  32  *
  33  * ARP:
  34  *
  35  *      Prerequisites:  - own ethernet address
  36  *                      - own IP address
  37  *                      - TFTP server IP address
  38  *      We want:        - TFTP server ethernet address
  39  *      Next step:      TFTP
  40  *
  41  * DHCP:
  42  *
  43  *     Prerequisites:   - own ethernet address
  44  *     We want:         - IP, Netmask, ServerIP, Gateway IP
  45  *                      - bootfilename, lease time
  46  *     Next step:       - TFTP
  47  *
  48  * TFTP:
  49  *
  50  *      Prerequisites:  - own ethernet address
  51  *                      - own IP address
  52  *                      - TFTP server IP address
  53  *                      - TFTP server ethernet address
  54  *                      - name of bootfile (if unknown, we use a default name
  55  *                        derived from our own IP address)
  56  *      We want:        - load the boot file
  57  *      Next step:      none
  58  *
  59  * NFS:
  60  *
  61  *      Prerequisites:  - own ethernet address
  62  *                      - own IP address
  63  *                      - name of bootfile (if unknown, we use a default name
  64  *                        derived from our own IP address)
  65  *      We want:        - load the boot file
  66  *      Next step:      none
  67  *
  68  * SNTP:
  69  *
  70  *      Prerequisites:  - own ethernet address
  71  *                      - own IP address
  72  *      We want:        - network time
  73  *      Next step:      none
  74  */
  75
  76
  77 #include <common.h>
  78 #include <watchdog.h>
  79 #include <command.h>
  80 #include <net.h>
  81 #include "bootp.h"
  82 #include "tftp.h"
  83 #include "rarp.h"
  84 #include "nfs.h"
  85 #ifdef CONFIG_STATUS_LED
  86 #include <status_led.h>
  87 #include <miiphy.h>
  88 #endif
  89 #if defined(CONFIG_CMD_SNTP)
  90 #include "sntp.h"
  91 #endif
  92 #if defined(CONFIG_CDP_VERSION)
  93 #include <timestamp.h>
  94 #endif
  95
  96 #if defined(CONFIG_CMD_NET)
  97
  98 DECLARE_GLOBAL_DATA_PTR;
  99
 100 #ifndef CONFIG_ARP_TIMEOUT
 101 # define ARP_TIMEOUT            5000UL  /* Milliseconds before trying ARP again */
 102 #else
 103 # define ARP_TIMEOUT            CONFIG_ARP_TIMEOUT
 104 #endif
 105
 106
 107 #ifndef CONFIG_NET_RETRY_COUNT
 108 # define ARP_TIMEOUT_COUNT      5       /* # of timeouts before giving up  */
 109 #else
 110 # define ARP_TIMEOUT_COUNT      CONFIG_NET_RETRY_COUNT
 111 #endif
 112
 113 #if 0
 114 #define ET_DEBUG
 115 #endif
 116
 117 /** BOOTP EXTENTIONS **/
 118
 119 IPaddr_t        NetOurSubnetMask=0;             /* Our subnet mask (0=unknown)  */
 120 IPaddr_t        NetOurGatewayIP=0;              /* Our gateways IP address      */
 121 IPaddr_t        NetOurDNSIP=0;                  /* Our DNS IP address           */
 122 #if defined(CONFIG_BOOTP_DNS2)
 123 IPaddr_t        NetOurDNS2IP=0;                 /* Our 2nd DNS IP address       */
 124 #endif
 125 char            NetOurNISDomain[32]={0,};       /* Our NIS domain               */
 126 char            NetOurHostName[32]={0,};        /* Our hostname                 */
 127 char            NetOurRootPath[64]={0,};        /* Our bootpath                 */
 128 ushort          NetBootFileSize=0;              /* Our bootfile size in blocks  */
 129
 130 #ifdef CONFIG_MCAST_TFTP        /* Multicast TFTP */
 131 IPaddr_t Mcast_addr;
 132 #endif
 133
 134 /** END OF BOOTP EXTENTIONS **/
 135
 136 ulong           NetBootFileXferSize;    /* The actual transferred size of the bootfile (in bytes) */
 137 uchar           NetOurEther[6];         /* Our ethernet address                 */
 138 uchar           NetServerEther[6] =     /* Boot server enet address             */
 139                         { 0, 0, 0, 0, 0, 0 };
 140 IPaddr_t        NetOurIP;               /* Our IP addr (0 = unknown)            */
 141 IPaddr_t        NetServerIP;            /* Server IP addr (0 = unknown)         */
 142 volatile uchar *NetRxPkt;               /* Current receive packet               */
 143 int             NetRxPktLen;            /* Current rx packet length             */
 144 unsigned        NetIPID;                /* IP packet ID                         */
 145 uchar           NetBcastAddr[6] =       /* Ethernet bcast address               */
 146                         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 147 uchar           NetEtherNullAddr[6] =
 148                         { 0, 0, 0, 0, 0, 0 };
 149 #ifdef CONFIG_API
 150 void            (*push_packet)(volatile void *, int len) = 0;
 151 #endif
 152 #if defined(CONFIG_CMD_CDP)
 153 uchar           NetCDPAddr[6] =         /* Ethernet bcast address               */
 154                         { 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc };
 155 #endif
 156 int             NetState;               /* Network loop state                   */
 157 #ifdef CONFIG_NET_MULTI
 158 int             NetRestartWrap = 0;     /* Tried all network devices            */
 159 static int      NetRestarted = 0;       /* Network loop restarted               */
 160 static int      NetDevExists = 0;       /* At least one device configured       */
 161 #endif
 162
 163 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
 164 ushort          NetOurVLAN = 0xFFFF;            /* default is without VLAN      */
 165 ushort          NetOurNativeVLAN = 0xFFFF;      /* ditto                        */
 166
 167 char            BootFile[128];          /* Boot File name                       */
 168
 169 #if defined(CONFIG_CMD_PING)
 170 IPaddr_t        NetPingIP;              /* the ip address to ping               */
 171
 172 static void PingStart(void);
 173 #endif
 174
 175 #if defined(CONFIG_CMD_CDP)
 176 static void CDPStart(void);
 177 #endif
 178
 179 #if defined(CONFIG_CMD_SNTP)
 180 IPaddr_t        NetNtpServerIP;         /* NTP server IP address                */
 181 int             NetTimeOffset=0;        /* offset time from UTC                 */
 182 #endif
 183
 184 #ifdef CONFIG_NETCONSOLE
 185 void NcStart(void);
 186 int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len);
 187 #endif
 188
 189 volatile uchar  PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 190
 191 volatile uchar *NetRxPackets[PKTBUFSRX]; /* Receive packets                     */
 192
 193 static rxhand_f *packetHandler;         /* Current RX packet handler            */
 194 static thand_f *timeHandler;            /* Current timeout handler              */
 195 static ulong    timeStart;              /* Time base value                      */
 196 static ulong    timeDelta;              /* Current timeout value                */
 197 volatile uchar *NetTxPacket = 0;        /* THE transmit packet                  */
 198
 199 static int net_check_prereq (proto_t protocol);
 200
 201 /**********************************************************************/
 202
 203 IPaddr_t        NetArpWaitPacketIP;
 204 IPaddr_t        NetArpWaitReplyIP;
 205 uchar          *NetArpWaitPacketMAC;    /* MAC address of waiting packet's destination  */
 206 uchar          *NetArpWaitTxPacket;     /* THE transmit packet                  */
 207 int             NetArpWaitTxPacketSize;
 208 uchar           NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
 209 ulong           NetArpWaitTimerStart;
 210 int             NetArpWaitTry;
 211
 212 int             env_changed_id = 0;
 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) {
 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 int
 282 NetInitLoop(proto_t protocol)
 283 {
 284         bd_t *bd = gd->bd;
 285         int env_id = get_env_id ();
 286
 287         /* update only when the environment has changed */
 288         if (env_changed_id == env_id)
 289                 return 0;
 290
 291         switch (protocol) {
 292 #if defined(CONFIG_CMD_NFS)
 293         case NFS:
 294 #endif
 295 #if defined(CONFIG_CMD_PING)
 296         case PING:
 297 #endif
 298 #if defined(CONFIG_CMD_SNTP)
 299         case SNTP:
 300 #endif
 301         case NETCONS:
 302         case TFTP:
 303                 NetCopyIP(&NetOurIP, &bd->bi_ip_addr);
 304                 NetOurGatewayIP = getenv_IPaddr ("gatewayip");
 305                 NetOurSubnetMask= getenv_IPaddr ("netmask");
 306                 NetOurVLAN = getenv_VLAN("vlan");
 307                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 308
 309                 switch (protocol) {
 310 #if defined(CONFIG_CMD_NFS)
 311                 case NFS:
 312 #endif
 313                 case NETCONS:
 314                 case TFTP:
 315                         NetServerIP = getenv_IPaddr ("serverip");
 316                         break;
 317 #if defined(CONFIG_CMD_PING)
 318                 case PING:
 319                         /* nothing */
 320                         break;
 321 #endif
 322 #if defined(CONFIG_CMD_SNTP)
 323                 case SNTP:
 324                         /* nothing */
 325                         break;
 326 #endif
 327                 default:
 328                         break;
 329                 }
 330
 331                 break;
 332         case BOOTP:
 333         case RARP:
 334                 /*
 335                  * initialize our IP addr to 0 in order to accept ANY
 336                  * IP addr assigned to us by the BOOTP / RARP server
 337                  */
 338                 NetOurIP = 0;
 339                 NetServerIP = getenv_IPaddr ("serverip");
 340                 NetOurVLAN = getenv_VLAN("vlan");       /* VLANs must be read */
 341                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 342         case CDP:
 343                 NetOurVLAN = getenv_VLAN("vlan");       /* VLANs must be read */
 344                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 345                 break;
 346         default:
 347                 break;
 348         }
 349         env_changed_id = env_id;
 350         return 0;
 351 }
 352
 353 /**********************************************************************/
 354 /*
 355  *      Main network processing loop.
 356  */
 357
 358 int
 359 NetLoop(proto_t protocol)
 360 {
 361         bd_t *bd = gd->bd;
 362
 363 #ifdef CONFIG_NET_MULTI
 364         NetRestarted = 0;
 365         NetDevExists = 0;
 366 #endif
 367
 368         /* XXX problem with bss workaround */
 369         NetArpWaitPacketMAC = NULL;
 370         NetArpWaitTxPacket = NULL;
 371         NetArpWaitPacketIP = 0;
 372         NetArpWaitReplyIP = 0;
 373         NetArpWaitTxPacket = NULL;
 374         NetTxPacket = NULL;
 375
 376         if (!NetTxPacket) {
 377                 int     i;
 378                 /*
 379                  *      Setup packet buffers, aligned correctly.
 380                  */
 381                 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
 382                 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
 383                 for (i = 0; i < PKTBUFSRX; i++) {
 384                         NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
 385                 }
 386         }
 387
 388         if (!NetArpWaitTxPacket) {
 389                 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
 390                 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
 391                 NetArpWaitTxPacketSize = 0;
 392         }
 393
 394         eth_halt();
 395 #ifdef CONFIG_NET_MULTI
 396         eth_set_current();
 397 #endif
 398         if (eth_init(bd) < 0) {
 399                 eth_halt();
 400                 return(-1);
 401         }
 402
 403 restart:
 404 #ifdef CONFIG_NET_MULTI
 405         memcpy (NetOurEther, eth_get_dev()->enetaddr, 6);
 406 #else
 407         memcpy (NetOurEther, bd->bi_enetaddr, 6);
 408 #endif
 409
 410         NetState = NETLOOP_CONTINUE;
 411
 412         /*
 413          *      Start the ball rolling with the given start function.  From
 414          *      here on, this code is a state machine driven by received
 415          *      packets and timer events.
 416          */
 417         NetInitLoop(protocol);
 418
 419         switch (net_check_prereq (protocol)) {
 420         case 1:
 421                 /* network not configured */
 422                 eth_halt();
 423                 return (-1);
 424
 425 #ifdef CONFIG_NET_MULTI
 426         case 2:
 427                 /* network device not configured */
 428                 break;
 429 #endif /* CONFIG_NET_MULTI */
 430
 431         case 0:
 432 #ifdef CONFIG_NET_MULTI
 433                 NetDevExists = 1;
 434 #endif
 435                 switch (protocol) {
 436                 case TFTP:
 437                         /* always use ARP to get server ethernet address */
 438                         TftpStart();
 439                         break;
 440
 441 #if defined(CONFIG_CMD_DHCP)
 442                 case DHCP:
 443                         /* Start with a clean slate... */
 444                         BootpTry = 0;
 445                         NetOurIP = 0;
 446                         NetServerIP = getenv_IPaddr ("serverip");
 447                         DhcpRequest();          /* Basically same as BOOTP */
 448                         break;
 449 #endif
 450
 451                 case BOOTP:
 452                         BootpTry = 0;
 453                         BootpRequest ();
 454                         break;
 455
 456                 case RARP:
 457                         RarpTry = 0;
 458                         RarpRequest ();
 459                         break;
 460 #if defined(CONFIG_CMD_PING)
 461                 case PING:
 462                         PingStart();
 463                         break;
 464 #endif
 465 #if defined(CONFIG_CMD_NFS)
 466                 case NFS:
 467                         NfsStart();
 468                         break;
 469 #endif
 470 #if defined(CONFIG_CMD_CDP)
 471                 case CDP:
 472                         CDPStart();
 473                         break;
 474 #endif
 475 #ifdef CONFIG_NETCONSOLE
 476                 case NETCONS:
 477                         NcStart();
 478                         break;
 479 #endif
 480 #if defined(CONFIG_CMD_SNTP)
 481                 case SNTP:
 482                         SntpStart();
 483                         break;
 484 #endif
 485                 default:
 486                         break;
 487                 }
 488
 489                 NetBootFileXferSize = 0;
 490                 break;
 491         }
 492
 493 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 494 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && defined(CONFIG_STATUS_LED) && defined(STATUS_LED_RED)
 495         /*
 496          * Echo the inverted link state to the fault LED.
 497          */
 498         if(miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) {
 499                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 500         } else {
 501                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 502         }
 503 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 504 #endif /* CONFIG_MII, ... */
 505
 506         /*
 507          *      Main packet reception loop.  Loop receiving packets until
 508          *      someone sets `NetState' to a state that terminates.
 509          */
 510         for (;;) {
 511                 WATCHDOG_RESET();
 512 #ifdef CONFIG_SHOW_ACTIVITY
 513                 {
 514                         extern void show_activity(int arg);
 515                         show_activity(1);
 516                 }
 517 #endif
 518                 /*
 519                  *      Check the ethernet for a new packet.  The ethernet
 520                  *      receive routine will process it.
 521                  */
 522                 eth_rx();
 523
 524                 /*
 525                  *      Abort if ctrl-c was pressed.
 526                  */
 527                 if (ctrlc()) {
 528                         eth_halt();
 529                         puts ("\nAbort\n");
 530                         return (-1);
 531                 }
 532
 533                 ArpTimeoutCheck();
 534
 535                 /*
 536                  *      Check for a timeout, and run the timeout handler
 537                  *      if we have one.
 538                  */
 539                 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
 540                         thand_f *x;
 541
 542 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 543 #  if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \
 544       defined(CONFIG_STATUS_LED) &&        \
 545       defined(STATUS_LED_RED)
 546                         /*
 547                          * Echo the inverted link state to the fault LED.
 548                          */
 549                         if(miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) {
 550                                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 551                         } else {
 552                                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 553                         }
 554 #  endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 555 #endif /* CONFIG_MII, ... */
 556                         x = timeHandler;
 557                         timeHandler = (thand_f *)0;
 558                         (*x)();
 559                 }
 560
 561
 562                 switch (NetState) {
 563
 564                 case NETLOOP_RESTART:
 565 #ifdef CONFIG_NET_MULTI
 566                         NetRestarted = 1;
 567 #endif
 568                         goto restart;
 569
 570                 case NETLOOP_SUCCESS:
 571                         if (NetBootFileXferSize > 0) {
 572                                 char buf[20];
 573                                 printf("Bytes transferred = %ld (%lx hex)\n",
 574                                         NetBootFileXferSize,
 575                                         NetBootFileXferSize);
 576                                 sprintf(buf, "%lX", NetBootFileXferSize);
 577                                 setenv("filesize", buf);
 578
 579                                 sprintf(buf, "%lX", (unsigned long)load_addr);
 580                                 setenv("fileaddr", buf);
 581                         }
 582                         eth_halt();
 583                         return NetBootFileXferSize;
 584
 585                 case NETLOOP_FAIL:
 586                         return (-1);
 587                 }
 588         }
 589 }
 590
 591 /**********************************************************************/
 592
 593 static void
 594 startAgainTimeout(void)
 595 {
 596         NetState = NETLOOP_RESTART;
 597 }
 598
 599 static void
 600 startAgainHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
 601 {
 602         /* Totally ignore the packet */
 603 }
 604
 605 void NetStartAgain (void)
 606 {
 607         char *nretry;
 608         int noretry = 0, once = 0;
 609
 610         if ((nretry = getenv ("netretry")) != NULL) {
 611                 noretry = (strcmp (nretry, "no") == 0);
 612                 once = (strcmp (nretry, "once") == 0);
 613         }
 614         if (noretry) {
 615                 eth_halt ();
 616                 NetState = NETLOOP_FAIL;
 617                 return;
 618         }
 619 #ifndef CONFIG_NET_MULTI
 620         NetSetTimeout (10000UL, startAgainTimeout);
 621         NetSetHandler (startAgainHandler);
 622 #else   /* !CONFIG_NET_MULTI*/
 623         eth_halt ();
 624 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
 625         eth_try_another (!NetRestarted);
 626 #endif
 627         eth_init (gd->bd);
 628         if (NetRestartWrap) {
 629                 NetRestartWrap = 0;
 630                 if (NetDevExists && !once) {
 631                         NetSetTimeout (10000UL, startAgainTimeout);
 632                         NetSetHandler (startAgainHandler);
 633                 } else {
 634                         NetState = NETLOOP_FAIL;
 635                 }
 636         } else {
 637                 NetState = NETLOOP_RESTART;
 638         }
 639 #endif  /* CONFIG_NET_MULTI */
 640 }
 641
 642 /**********************************************************************/
 643 /*
 644  *      Miscelaneous bits.
 645  */
 646
 647 void
 648 NetSetHandler(rxhand_f * f)
 649 {
 650         packetHandler = f;
 651 }
 652
 653
 654 void
 655 NetSetTimeout(ulong iv, thand_f * f)
 656 {
 657         if (iv == 0) {
 658                 timeHandler = (thand_f *)0;
 659         } else {
 660                 timeHandler = f;
 661                 timeStart = get_timer(0);
 662                 timeDelta = iv;
 663         }
 664 }
 665
 666
 667 void
 668 NetSendPacket(volatile uchar * pkt, int len)
 669 {
 670         (void) eth_send(pkt, len);
 671 }
 672
 673 int
 674 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
 675 {
 676         uchar *pkt;
 677
 678         /* convert to new style broadcast */
 679         if (dest == 0)
 680                 dest = 0xFFFFFFFF;
 681
 682         /* if broadcast, make the ether address a broadcast and don't do ARP */
 683         if (dest == 0xFFFFFFFF)
 684                 ether = NetBcastAddr;
 685
 686         /* if MAC address was not discovered yet, save the packet and do an ARP request */
 687         if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
 688
 689 #ifdef ET_DEBUG
 690                 printf("sending ARP for %08lx\n", dest);
 691 #endif
 692                 NetArpWaitPacketIP = dest;
 693                 NetArpWaitPacketMAC = ether;
 694
 695                 pkt = NetArpWaitTxPacket;
 696                 pkt += NetSetEther (pkt, NetArpWaitPacketMAC, PROT_IP);
 697
 698                 NetSetIP (pkt, dest, dport, sport, len);
 699                 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len);
 700
 701                 /* size of the waiting packet */
 702                 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE + len;
 703
 704                 /* and do the ARP request */
 705                 NetArpWaitTry = 1;
 706                 NetArpWaitTimerStart = get_timer(0);
 707                 ArpRequest();
 708                 return 1;       /* waiting */
 709         }
 710
 711 #ifdef ET_DEBUG
 712         printf("sending UDP to %08lx/%02x:%02x:%02x:%02x:%02x:%02x\n",
 713                 dest, ether[0], ether[1], ether[2], ether[3], ether[4], ether[5]);
 714 #endif
 715
 716         pkt = (uchar *)NetTxPacket;
 717         pkt += NetSetEther (pkt, ether, PROT_IP);
 718         NetSetIP (pkt, dest, dport, sport, len);
 719         (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len);
 720
 721         return 0;       /* transmitted */
 722 }
 723
 724 #if defined(CONFIG_CMD_PING)
 725 static ushort PingSeqNo;
 726
 727 int PingSend(void)
 728 {
 729         static uchar mac[6];
 730         volatile IP_t *ip;
 731         volatile ushort *s;
 732         uchar *pkt;
 733
 734         /* XXX always send arp request */
 735
 736         memcpy(mac, NetEtherNullAddr, 6);
 737
 738 #ifdef ET_DEBUG
 739         printf("sending ARP for %08lx\n", NetPingIP);
 740 #endif
 741
 742         NetArpWaitPacketIP = NetPingIP;
 743         NetArpWaitPacketMAC = mac;
 744
 745         pkt = NetArpWaitTxPacket;
 746         pkt += NetSetEther(pkt, mac, PROT_IP);
 747
 748         ip = (volatile IP_t *)pkt;
 749
 750         /*
 751          *      Construct an IP and ICMP header.  (need to set no fragment bit - XXX)
 752          */
 753         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
 754         ip->ip_tos   = 0;
 755         ip->ip_len   = htons(IP_HDR_SIZE_NO_UDP + 8);
 756         ip->ip_id    = htons(NetIPID++);
 757         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
 758         ip->ip_ttl   = 255;
 759         ip->ip_p     = 0x01;            /* ICMP */
 760         ip->ip_sum   = 0;
 761         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
 762         NetCopyIP((void*)&ip->ip_dst, &NetPingIP);         /* - "" - */
 763         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
 764
 765         s = &ip->udp_src;               /* XXX ICMP starts here */
 766         s[0] = htons(0x0800);           /* echo-request, code */
 767         s[1] = 0;                       /* checksum */
 768         s[2] = 0;                       /* identifier */
 769         s[3] = htons(PingSeqNo++);      /* sequence number */
 770         s[1] = ~NetCksum((uchar *)s, 8/2);
 771
 772         /* size of the waiting packet */
 773         NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8;
 774
 775         /* and do the ARP request */
 776         NetArpWaitTry = 1;
 777         NetArpWaitTimerStart = get_timer(0);
 778         ArpRequest();
 779         return 1;       /* waiting */
 780 }
 781
 782 static void
 783 PingTimeout (void)
 784 {
 785         eth_halt();
 786         NetState = NETLOOP_FAIL;        /* we did not get the reply */
 787 }
 788
 789 static void
 790 PingHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
 791 {
 792         IPaddr_t tmp;
 793         volatile IP_t *ip = (volatile IP_t *)pkt;
 794
 795         tmp = NetReadIP((void *)&ip->ip_src);
 796         if (tmp != NetPingIP)
 797                 return;
 798
 799         NetState = NETLOOP_SUCCESS;
 800 }
 801
 802 static void PingStart(void)
 803 {
 804 #if defined(CONFIG_NET_MULTI)
 805         printf ("Using %s device\n", eth_get_name());
 806 #endif  /* CONFIG_NET_MULTI */
 807         NetSetTimeout (10000UL, PingTimeout);
 808         NetSetHandler (PingHandler);
 809
 810         PingSend();
 811 }
 812 #endif
 813
 814 #if defined(CONFIG_CMD_CDP)
 815
 816 #define CDP_DEVICE_ID_TLV               0x0001
 817 #define CDP_ADDRESS_TLV                 0x0002
 818 #define CDP_PORT_ID_TLV                 0x0003
 819 #define CDP_CAPABILITIES_TLV            0x0004
 820 #define CDP_VERSION_TLV                 0x0005
 821 #define CDP_PLATFORM_TLV                0x0006
 822 #define CDP_NATIVE_VLAN_TLV             0x000a
 823 #define CDP_APPLIANCE_VLAN_TLV          0x000e
 824 #define CDP_TRIGGER_TLV                 0x000f
 825 #define CDP_POWER_CONSUMPTION_TLV       0x0010
 826 #define CDP_SYSNAME_TLV                 0x0014
 827 #define CDP_SYSOBJECT_TLV               0x0015
 828 #define CDP_MANAGEMENT_ADDRESS_TLV      0x0016
 829
 830 #define CDP_TIMEOUT                     250UL   /* one packet every 250ms */
 831
 832 static int CDPSeq;
 833 static int CDPOK;
 834
 835 ushort CDPNativeVLAN;
 836 ushort CDPApplianceVLAN;
 837
 838 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 0x00 };
 839
 840 static ushort CDP_compute_csum(const uchar *buff, ushort len)
 841 {
 842         ushort csum;
 843         int     odd;
 844         ulong   result = 0;
 845         ushort  leftover;
 846         ushort *p;
 847
 848         if (len > 0) {
 849                 odd = 1 & (ulong)buff;
 850                 if (odd) {
 851                         result = *buff << 8;
 852                         len--;
 853                         buff++;
 854                 }
 855                 while (len > 1) {
 856                         p = (ushort *)buff;
 857                         result += *p++;
 858                         buff = (uchar *)p;
 859                         if (result & 0x80000000)
 860                                 result = (result & 0xFFFF) + (result >> 16);
 861                         len -= 2;
 862                 }
 863                 if (len) {
 864                         leftover = (signed short)(*(const signed char *)buff);
 865                         /* CISCO SUCKS big time! (and blows too):
 866                          * CDP uses the IP checksum algorithm with a twist;
 867                          * for the last byte it *sign* extends and sums.
 868                          */
 869                         result = (result & 0xffff0000) | ((result + leftover) & 0x0000ffff);
 870                 }
 871                 while (result >> 16)
 872                         result = (result & 0xFFFF) + (result >> 16);
 873
 874                 if (odd)
 875                         result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
 876         }
 877
 878         /* add up 16-bit and 17-bit words for 17+c bits */
 879         result = (result & 0xffff) + (result >> 16);
 880         /* add up 16-bit and 2-bit for 16+c bit */
 881         result = (result & 0xffff) + (result >> 16);
 882         /* add up carry.. */
 883         result = (result & 0xffff) + (result >> 16);
 884
 885         /* negate */
 886         csum = ~(ushort)result;
 887
 888         /* run time endian detection */
 889         if (csum != htons(csum))        /* little endian */
 890                 csum = htons(csum);
 891
 892         return csum;
 893 }
 894
 895 int CDPSendTrigger(void)
 896 {
 897         volatile uchar *pkt;
 898         volatile ushort *s;
 899         volatile ushort *cp;
 900         Ethernet_t *et;
 901         int len;
 902         ushort chksum;
 903 #if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID)   || \
 904     defined(CONFIG_CDP_VERSION)   || defined(CONFIG_CDP_PLATFORM)
 905         char buf[32];
 906 #endif
 907
 908         pkt = NetTxPacket;
 909         et = (Ethernet_t *)pkt;
 910
 911         /* NOTE: trigger sent not on any VLAN */
 912
 913         /* form ethernet header */
 914         memcpy(et->et_dest, NetCDPAddr, 6);
 915         memcpy(et->et_src, NetOurEther, 6);
 916
 917         pkt += ETHER_HDR_SIZE;
 918
 919         /* SNAP header */
 920         memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr));
 921         pkt += sizeof(CDP_SNAP_hdr);
 922
 923         /* CDP header */
 924         *pkt++ = 0x02;                          /* CDP version 2 */
 925         *pkt++ = 180;                           /* TTL */
 926         s = (volatile ushort *)pkt;
 927         cp = s;
 928         *s++ = htons(0);                        /* checksum (0 for later calculation) */
 929
 930         /* CDP fields */
 931 #ifdef CONFIG_CDP_DEVICE_ID
 932         *s++ = htons(CDP_DEVICE_ID_TLV);
 933         *s++ = htons(CONFIG_CDP_DEVICE_ID);
 934         memset(buf, 0, sizeof(buf));
 935         sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%02X%02X%02X%02X%02X%02X",
 936                 NetOurEther[0] & 0xff, NetOurEther[1] & 0xff,
 937                 NetOurEther[2] & 0xff, NetOurEther[3] & 0xff,
 938                 NetOurEther[4] & 0xff, NetOurEther[5] & 0xff);
 939         memcpy((uchar *)s, buf, 16);
 940         s += 16 / 2;
 941 #endif
 942
 943 #ifdef CONFIG_CDP_PORT_ID
 944         *s++ = htons(CDP_PORT_ID_TLV);
 945         memset(buf, 0, sizeof(buf));
 946         sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index());
 947         len = strlen(buf);
 948         if (len & 1)    /* make it even */
 949                 len++;
 950         *s++ = htons(len + 4);
 951         memcpy((uchar *)s, buf, len);
 952         s += len / 2;
 953 #endif
 954
 955 #ifdef CONFIG_CDP_CAPABILITIES
 956         *s++ = htons(CDP_CAPABILITIES_TLV);
 957         *s++ = htons(8);
 958         *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES);
 959         s += 2;
 960 #endif
 961
 962 #ifdef CONFIG_CDP_VERSION
 963         *s++ = htons(CDP_VERSION_TLV);
 964         memset(buf, 0, sizeof(buf));
 965         strcpy(buf, CONFIG_CDP_VERSION);
 966         len = strlen(buf);
 967         if (len & 1)    /* make it even */
 968                 len++;
 969         *s++ = htons(len + 4);
 970         memcpy((uchar *)s, buf, len);
 971         s += len / 2;
 972 #endif
 973
 974 #ifdef CONFIG_CDP_PLATFORM
 975         *s++ = htons(CDP_PLATFORM_TLV);
 976         memset(buf, 0, sizeof(buf));
 977         strcpy(buf, CONFIG_CDP_PLATFORM);
 978         len = strlen(buf);
 979         if (len & 1)    /* make it even */
 980                 len++;
 981         *s++ = htons(len + 4);
 982         memcpy((uchar *)s, buf, len);
 983         s += len / 2;
 984 #endif
 985
 986 #ifdef CONFIG_CDP_TRIGGER
 987         *s++ = htons(CDP_TRIGGER_TLV);
 988         *s++ = htons(8);
 989         *(ulong *)s = htonl(CONFIG_CDP_TRIGGER);
 990         s += 2;
 991 #endif
 992
 993 #ifdef CONFIG_CDP_POWER_CONSUMPTION
 994         *s++ = htons(CDP_POWER_CONSUMPTION_TLV);
 995         *s++ = htons(6);
 996         *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION);
 997 #endif
 998
 999         /* length of ethernet packet */
1000         len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE);
1001         et->et_protlen = htons(len);
1002
1003         len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr);
1004         chksum = CDP_compute_csum((uchar *)NetTxPacket + len, (uchar *)s - (NetTxPacket + len));
1005         if (chksum == 0)
1006                 chksum = 0xFFFF;
1007         *cp = htons(chksum);
1008
1009         (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket);
1010         return 0;
1011 }
1012
1013 static void
1014 CDPTimeout (void)
1015 {
1016         CDPSeq++;
1017
1018         if (CDPSeq < 3) {
1019                 NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
1020                 CDPSendTrigger();
1021                 return;
1022         }
1023
1024         /* if not OK try again */
1025         if (!CDPOK)
1026                 NetStartAgain();
1027         else
1028                 NetState = NETLOOP_SUCCESS;
1029 }
1030
1031 static void
1032 CDPDummyHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
1033 {
1034         /* nothing */
1035 }
1036
1037 static void
1038 CDPHandler(const uchar * pkt, unsigned len)
1039 {
1040         const uchar *t;
1041         const ushort *ss;
1042         ushort type, tlen;
1043         uchar applid;
1044         ushort vlan, nvlan;
1045
1046         /* minimum size? */
1047         if (len < sizeof(CDP_SNAP_hdr) + 4)
1048                 goto pkt_short;
1049
1050         /* check for valid CDP SNAP header */
1051         if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0)
1052                 return;
1053
1054         pkt += sizeof(CDP_SNAP_hdr);
1055         len -= sizeof(CDP_SNAP_hdr);
1056
1057         /* Version of CDP protocol must be >= 2 and TTL != 0 */
1058         if (pkt[0] < 0x02 || pkt[1] == 0)
1059                 return;
1060
1061         /* if version is greater than 0x02 maybe we'll have a problem; output a warning */
1062         if (pkt[0] != 0x02)
1063                 printf("** WARNING: CDP packet received with a protocol version %d > 2\n",
1064                                 pkt[0] & 0xff);
1065
1066         if (CDP_compute_csum(pkt, len) != 0)
1067                 return;
1068
1069         pkt += 4;
1070         len -= 4;
1071
1072         vlan = htons(-1);
1073         nvlan = htons(-1);
1074         while (len > 0) {
1075                 if (len < 4)
1076                         goto pkt_short;
1077
1078                 ss = (const ushort *)pkt;
1079                 type = ntohs(ss[0]);
1080                 tlen = ntohs(ss[1]);
1081                 if (tlen > len) {
1082                         goto pkt_short;
1083                 }
1084
1085                 pkt += tlen;
1086                 len -= tlen;
1087
1088                 ss += 2;        /* point ss to the data of the TLV */
1089                 tlen -= 4;
1090
1091                 switch (type) {
1092                         case CDP_DEVICE_ID_TLV:
1093                                 break;
1094                         case CDP_ADDRESS_TLV:
1095                                 break;
1096                         case CDP_PORT_ID_TLV:
1097                                 break;
1098                         case CDP_CAPABILITIES_TLV:
1099                                 break;
1100                         case CDP_VERSION_TLV:
1101                                 break;
1102                         case CDP_PLATFORM_TLV:
1103                                 break;
1104                         case CDP_NATIVE_VLAN_TLV:
1105                                 nvlan = *ss;
1106                                 break;
1107                         case CDP_APPLIANCE_VLAN_TLV:
1108                                 t = (const uchar *)ss;
1109                                 while (tlen > 0) {
1110                                         if (tlen < 3)
1111                                                 goto pkt_short;
1112
1113                                         applid = t[0];
1114                                         ss = (const ushort *)(t + 1);
1115
1116 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE
1117                                         if (applid == CONFIG_CDP_APPLIANCE_VLAN_TYPE)
1118                                                 vlan = *ss;
1119 #else
1120                                         vlan = ntohs(*ss);      /* XXX will this work; dunno */
1121 #endif
1122                                         t += 3; tlen -= 3;
1123                                 }
1124                                 break;
1125                         case CDP_TRIGGER_TLV:
1126                                 break;
1127                         case CDP_POWER_CONSUMPTION_TLV:
1128                                 break;
1129                         case CDP_SYSNAME_TLV:
1130                                 break;
1131                         case CDP_SYSOBJECT_TLV:
1132                                 break;
1133                         case CDP_MANAGEMENT_ADDRESS_TLV:
1134                                 break;
1135                 }
1136         }
1137
1138         CDPApplianceVLAN = vlan;
1139         CDPNativeVLAN = nvlan;
1140
1141         CDPOK = 1;
1142         return;
1143
1144  pkt_short:
1145         printf("** CDP packet is too short\n");
1146         return;
1147 }
1148
1149 static void CDPStart(void)
1150 {
1151 #if defined(CONFIG_NET_MULTI)
1152         printf ("Using %s device\n", eth_get_name());
1153 #endif
1154         CDPSeq = 0;
1155         CDPOK = 0;
1156
1157         CDPNativeVLAN = htons(-1);
1158         CDPApplianceVLAN = htons(-1);
1159
1160         NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
1161         NetSetHandler (CDPDummyHandler);
1162
1163         CDPSendTrigger();
1164 }
1165 #endif
1166
1167
1168 void
1169 NetReceive(volatile uchar * inpkt, int len)
1170 {
1171         Ethernet_t *et;
1172         IP_t    *ip;
1173         ARP_t   *arp;
1174         IPaddr_t tmp;
1175         int     x;
1176         uchar *pkt;
1177 #if defined(CONFIG_CMD_CDP)
1178         int iscdp;
1179 #endif
1180         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1181
1182 #ifdef ET_DEBUG
1183         printf("packet received\n");
1184 #endif
1185
1186         NetRxPkt = inpkt;
1187         NetRxPktLen = len;
1188         et = (Ethernet_t *)inpkt;
1189
1190         /* too small packet? */
1191         if (len < ETHER_HDR_SIZE)
1192                 return;
1193
1194 #ifdef CONFIG_API
1195         if (push_packet) {
1196                 (*push_packet)(inpkt, len);
1197                 return;
1198         }
1199 #endif
1200
1201 #if defined(CONFIG_CMD_CDP)
1202         /* keep track if packet is CDP */
1203         iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0;
1204 #endif
1205
1206         myvlanid = ntohs(NetOurVLAN);
1207         if (myvlanid == (ushort)-1)
1208                 myvlanid = VLAN_NONE;
1209         mynvlanid = ntohs(NetOurNativeVLAN);
1210         if (mynvlanid == (ushort)-1)
1211                 mynvlanid = VLAN_NONE;
1212
1213         x = ntohs(et->et_protlen);
1214
1215 #ifdef ET_DEBUG
1216         printf("packet received\n");
1217 #endif
1218
1219         if (x < 1514) {
1220                 /*
1221                  *      Got a 802 packet.  Check the other protocol field.
1222                  */
1223                 x = ntohs(et->et_prot);
1224
1225                 ip = (IP_t *)(inpkt + E802_HDR_SIZE);
1226                 len -= E802_HDR_SIZE;
1227
1228         } else if (x != PROT_VLAN) {    /* normal packet */
1229                 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE);
1230                 len -= ETHER_HDR_SIZE;
1231
1232         } else {                        /* VLAN packet */
1233                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et;
1234
1235 #ifdef ET_DEBUG
1236                 printf("VLAN packet received\n");
1237 #endif
1238                 /* too small packet? */
1239                 if (len < VLAN_ETHER_HDR_SIZE)
1240                         return;
1241
1242                 /* if no VLAN active */
1243                 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
1244 #if defined(CONFIG_CMD_CDP)
1245                                 && iscdp == 0
1246 #endif
1247                                 )
1248                         return;
1249
1250                 cti = ntohs(vet->vet_tag);
1251                 vlanid = cti & VLAN_IDMASK;
1252                 x = ntohs(vet->vet_type);
1253
1254                 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE);
1255                 len -= VLAN_ETHER_HDR_SIZE;
1256         }
1257
1258 #ifdef ET_DEBUG
1259         printf("Receive from protocol 0x%x\n", x);
1260 #endif
1261
1262 #if defined(CONFIG_CMD_CDP)
1263         if (iscdp) {
1264                 CDPHandler((uchar *)ip, len);
1265                 return;
1266         }
1267 #endif
1268
1269         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1270                 if (vlanid == VLAN_NONE)
1271                         vlanid = (mynvlanid & VLAN_IDMASK);
1272                 /* not matched? */
1273                 if (vlanid != (myvlanid & VLAN_IDMASK))
1274                         return;
1275         }
1276
1277         switch (x) {
1278
1279         case PROT_ARP:
1280                 /*
1281                  * We have to deal with two types of ARP packets:
1282                  * - REQUEST packets will be answered by sending  our
1283                  *   IP address - if we know it.
1284                  * - REPLY packates are expected only after we asked
1285                  *   for the TFTP server's or the gateway's ethernet
1286                  *   address; so if we receive such a packet, we set
1287                  *   the server ethernet address
1288                  */
1289 #ifdef ET_DEBUG
1290                 puts ("Got ARP\n");
1291 #endif
1292                 arp = (ARP_t *)ip;
1293                 if (len < ARP_HDR_SIZE) {
1294                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1295                         return;
1296                 }
1297                 if (ntohs(arp->ar_hrd) != ARP_ETHER) {
1298                         return;
1299                 }
1300                 if (ntohs(arp->ar_pro) != PROT_IP) {
1301                         return;
1302                 }
1303                 if (arp->ar_hln != 6) {
1304                         return;
1305                 }
1306                 if (arp->ar_pln != 4) {
1307                         return;
1308                 }
1309
1310                 if (NetOurIP == 0) {
1311                         return;
1312                 }
1313
1314                 if (NetReadIP(&arp->ar_data[16]) != NetOurIP) {
1315                         return;
1316                 }
1317
1318                 switch (ntohs(arp->ar_op)) {
1319                 case ARPOP_REQUEST:             /* reply with our IP address    */
1320 #ifdef ET_DEBUG
1321                         puts ("Got ARP REQUEST, return our IP\n");
1322 #endif
1323                         pkt = (uchar *)et;
1324                         pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
1325                         arp->ar_op = htons(ARPOP_REPLY);
1326                         memcpy   (&arp->ar_data[10], &arp->ar_data[0], 6);
1327                         NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
1328                         memcpy   (&arp->ar_data[ 0], NetOurEther, 6);
1329                         NetCopyIP(&arp->ar_data[ 6], &NetOurIP);
1330                         (void) eth_send((uchar *)et, (pkt - (uchar *)et) + ARP_HDR_SIZE);
1331                         return;
1332
1333                 case ARPOP_REPLY:               /* arp reply */
1334                         /* are we waiting for a reply */
1335                         if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
1336                                 break;
1337 #ifdef ET_DEBUG
1338                         printf("Got ARP REPLY, set server/gtwy eth addr (%02x:%02x:%02x:%02x:%02x:%02x)\n",
1339                                 arp->ar_data[0], arp->ar_data[1],
1340                                 arp->ar_data[2], arp->ar_data[3],
1341                                 arp->ar_data[4], arp->ar_data[5]);
1342 #endif
1343
1344                         tmp = NetReadIP(&arp->ar_data[6]);
1345
1346                         /* matched waiting packet's address */
1347                         if (tmp == NetArpWaitReplyIP) {
1348 #ifdef ET_DEBUG
1349                                 puts ("Got it\n");
1350 #endif
1351                                 /* save address for later use */
1352                                 memcpy(NetArpWaitPacketMAC, &arp->ar_data[0], 6);
1353
1354 #ifdef CONFIG_NETCONSOLE
1355                                 (*packetHandler)(0,0,0,0);
1356 #endif
1357                                 /* modify header, and transmit it */
1358                                 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6);
1359                                 (void) eth_send(NetArpWaitTxPacket, NetArpWaitTxPacketSize);
1360
1361                                 /* no arp request pending now */
1362                                 NetArpWaitPacketIP = 0;
1363                                 NetArpWaitTxPacketSize = 0;
1364                                 NetArpWaitPacketMAC = NULL;
1365
1366                         }
1367                         return;
1368                 default:
1369 #ifdef ET_DEBUG
1370                         printf("Unexpected ARP opcode 0x%x\n", ntohs(arp->ar_op));
1371 #endif
1372                         return;
1373                 }
1374                 break;
1375
1376         case PROT_RARP:
1377 #ifdef ET_DEBUG
1378                 puts ("Got RARP\n");
1379 #endif
1380                 arp = (ARP_t *)ip;
1381                 if (len < ARP_HDR_SIZE) {
1382                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1383                         return;
1384                 }
1385
1386                 if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
1387                         (ntohs(arp->ar_hrd) != ARP_ETHER)   ||
1388                         (ntohs(arp->ar_pro) != PROT_IP)     ||
1389                         (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
1390
1391                         puts ("invalid RARP header\n");
1392                 } else {
1393                         NetCopyIP(&NetOurIP,    &arp->ar_data[16]);
1394                         if (NetServerIP == 0)
1395                                 NetCopyIP(&NetServerIP, &arp->ar_data[ 6]);
1396                         memcpy (NetServerEther, &arp->ar_data[ 0], 6);
1397
1398                         (*packetHandler)(0,0,0,0);
1399                 }
1400                 break;
1401
1402         case PROT_IP:
1403 #ifdef ET_DEBUG
1404                 puts ("Got IP\n");
1405 #endif
1406                 if (len < IP_HDR_SIZE) {
1407                         debug ("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE);
1408                         return;
1409                 }
1410                 if (len < ntohs(ip->ip_len)) {
1411                         printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
1412                         return;
1413                 }
1414                 len = ntohs(ip->ip_len);
1415 #ifdef ET_DEBUG
1416                 printf("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
1417 #endif
1418                 if ((ip->ip_hl_v & 0xf0) != 0x40) {
1419                         return;
1420                 }
1421                 /* Can't deal with fragments */
1422                 if (ip->ip_off & htons(IP_OFFS | IP_FLAGS_MFRAG)) {
1423                         return;
1424                 }
1425                 /* can't deal with headers > 20 bytes */
1426                 if ((ip->ip_hl_v & 0x0f) > 0x05) {
1427                         return;
1428                 }
1429                 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
1430                         puts ("checksum bad\n");
1431                         return;
1432                 }
1433                 tmp = NetReadIP(&ip->ip_dst);
1434                 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
1435 #ifdef CONFIG_MCAST_TFTP
1436                         if (Mcast_addr != tmp)
1437 #endif
1438                         return;
1439                 }
1440                 /*
1441                  * watch for ICMP host redirects
1442                  *
1443                  * There is no real handler code (yet). We just watch
1444                  * for ICMP host redirect messages. In case anybody
1445                  * sees these messages: please contact me
1446                  * (wd@denx.de), or - even better - send me the
1447                  * necessary fixes :-)
1448                  *
1449                  * Note: in all cases where I have seen this so far
1450                  * it was a problem with the router configuration,
1451                  * for instance when a router was configured in the
1452                  * BOOTP reply, but the TFTP server was on the same
1453                  * subnet. So this is probably a warning that your
1454                  * configuration might be wrong. But I'm not really
1455                  * sure if there aren't any other situations.
1456                  */
1457                 if (ip->ip_p == IPPROTO_ICMP) {
1458                         ICMP_t *icmph = (ICMP_t *)&(ip->udp_src);
1459
1460                         switch (icmph->type) {
1461                         case ICMP_REDIRECT:
1462                                 if (icmph->code != ICMP_REDIR_HOST)
1463                                         return;
1464                                 printf (" ICMP Host Redirect to %pI4 ", &icmph->un.gateway);
1465                                 return;
1466 #if defined(CONFIG_CMD_PING)
1467                         case ICMP_ECHO_REPLY:
1468                                 /*
1469                                  *      IP header OK.  Pass the packet to the current handler.
1470                                  */
1471                                 /* XXX point to ip packet */
1472                                 (*packetHandler)((uchar *)ip, 0, 0, 0);
1473                                 return;
1474                         case ICMP_ECHO_REQUEST:
1475 #ifdef ET_DEBUG
1476                                 printf ("Got ICMP ECHO REQUEST, return %d bytes \n",
1477                                         ETHER_HDR_SIZE + len);
1478 #endif
1479                                 memcpy (&et->et_dest[0], &et->et_src[0], 6);
1480                                 memcpy (&et->et_src[ 0], NetOurEther, 6);
1481
1482                                 ip->ip_sum = 0;
1483                                 ip->ip_off = 0;
1484                                 NetCopyIP((void*)&ip->ip_dst, &ip->ip_src);
1485                                 NetCopyIP((void*)&ip->ip_src, &NetOurIP);
1486                                 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP >> 1);
1487
1488                                 icmph->type = ICMP_ECHO_REPLY;
1489                                 icmph->checksum = 0;
1490                                 icmph->checksum = ~NetCksum((uchar *)icmph,
1491                                                 (len - IP_HDR_SIZE_NO_UDP) >> 1);
1492                                 (void) eth_send((uchar *)et, ETHER_HDR_SIZE + len);
1493                                 return;
1494 #endif
1495                         default:
1496                                 return;
1497                         }
1498                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1499                         return;
1500                 }
1501
1502 #ifdef CONFIG_UDP_CHECKSUM
1503                 if (ip->udp_xsum != 0) {
1504                         ulong   xsum;
1505                         ushort *sumptr;
1506                         ushort  sumlen;
1507
1508                         xsum  = ip->ip_p;
1509                         xsum += (ntohs(ip->udp_len));
1510                         xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
1511                         xsum += (ntohl(ip->ip_src) >>  0) & 0x0000ffff;
1512                         xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
1513                         xsum += (ntohl(ip->ip_dst) >>  0) & 0x0000ffff;
1514
1515                         sumlen = ntohs(ip->udp_len);
1516                         sumptr = (ushort *) &(ip->udp_src);
1517
1518                         while (sumlen > 1) {
1519                                 ushort sumdata;
1520
1521                                 sumdata = *sumptr++;
1522                                 xsum += ntohs(sumdata);
1523                                 sumlen -= 2;
1524                         }
1525                         if (sumlen > 0) {
1526                                 ushort sumdata;
1527
1528                                 sumdata = *(unsigned char *) sumptr;
1529                                 sumdata = (sumdata << 8) & 0xff00;
1530                                 xsum += sumdata;
1531                         }
1532                         while ((xsum >> 16) != 0) {
1533                                 xsum = (xsum & 0x0000ffff) + ((xsum >> 16) & 0x0000ffff);
1534                         }
1535                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1536                                 printf(" UDP wrong checksum %08lx %08x\n",
1537                                         xsum, ntohs(ip->udp_xsum));
1538                                 return;
1539                         }
1540                 }
1541 #endif
1542
1543
1544 #ifdef CONFIG_NETCONSOLE
1545                 nc_input_packet((uchar *)ip +IP_HDR_SIZE,
1546                                                 ntohs(ip->udp_dst),
1547                                                 ntohs(ip->udp_src),
1548                                                 ntohs(ip->udp_len) - 8);
1549 #endif
1550                 /*
1551                  *      IP header OK.  Pass the packet to the current handler.
1552                  */
1553                 (*packetHandler)((uchar *)ip +IP_HDR_SIZE,
1554                                                 ntohs(ip->udp_dst),
1555                                                 ntohs(ip->udp_src),
1556                                                 ntohs(ip->udp_len) - 8);
1557                 break;
1558         }
1559 }
1560
1561
1562 /**********************************************************************/
1563
1564 static int net_check_prereq (proto_t protocol)
1565 {
1566         switch (protocol) {
1567                 /* Fall through */
1568 #if defined(CONFIG_CMD_PING)
1569         case PING:
1570                 if (NetPingIP == 0) {
1571                         puts ("*** ERROR: ping address not given\n");
1572                         return (1);
1573                 }
1574                 goto common;
1575 #endif
1576 #if defined(CONFIG_CMD_SNTP)
1577         case SNTP:
1578                 if (NetNtpServerIP == 0) {
1579                         puts ("*** ERROR: NTP server address not given\n");
1580                         return (1);
1581                 }
1582                 goto common;
1583 #endif
1584 #if defined(CONFIG_CMD_NFS)
1585         case NFS:
1586 #endif
1587         case NETCONS:
1588         case TFTP:
1589                 if (NetServerIP == 0) {
1590                         puts ("*** ERROR: `serverip' not set\n");
1591                         return (1);
1592                 }
1593 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP)
1594     common:
1595 #endif
1596
1597                 if (NetOurIP == 0) {
1598                         puts ("*** ERROR: `ipaddr' not set\n");
1599                         return (1);
1600                 }
1601                 /* Fall through */
1602
1603         case DHCP:
1604         case RARP:
1605         case BOOTP:
1606         case CDP:
1607                 if (memcmp (NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
1608 #ifdef CONFIG_NET_MULTI
1609                         extern int eth_get_dev_index (void);
1610                         int num = eth_get_dev_index ();
1611
1612                         switch (num) {
1613                         case -1:
1614                                 puts ("*** ERROR: No ethernet found.\n");
1615                                 return (1);
1616                         case 0:
1617                                 puts ("*** ERROR: `ethaddr' not set\n");
1618                                 break;
1619                         default:
1620                                 printf ("*** ERROR: `eth%daddr' not set\n",
1621                                         num);
1622                                 break;
1623                         }
1624
1625                         NetStartAgain ();
1626                         return (2);
1627 #else
1628                         puts ("*** ERROR: `ethaddr' not set\n");
1629                         return (1);
1630 #endif
1631                 }
1632                 /* Fall through */
1633         default:
1634                 return (0);
1635         }
1636         return (0);             /* OK */
1637 }
1638 /**********************************************************************/
1639
1640 int
1641 NetCksumOk(uchar * ptr, int len)
1642 {
1643         return !((NetCksum(ptr, len) + 1) & 0xfffe);
1644 }
1645
1646
1647 unsigned
1648 NetCksum(uchar * ptr, int len)
1649 {
1650         ulong   xsum;
1651         ushort *p = (ushort *)ptr;
1652
1653         xsum = 0;
1654         while (len-- > 0)
1655                 xsum += *p++;
1656         xsum = (xsum & 0xffff) + (xsum >> 16);
1657         xsum = (xsum & 0xffff) + (xsum >> 16);
1658         return (xsum & 0xffff);
1659 }
1660
1661 int
1662 NetEthHdrSize(void)
1663 {
1664         ushort myvlanid;
1665
1666         myvlanid = ntohs(NetOurVLAN);
1667         if (myvlanid == (ushort)-1)
1668                 myvlanid = VLAN_NONE;
1669
1670         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : VLAN_ETHER_HDR_SIZE;
1671 }
1672
1673 int
1674 NetSetEther(volatile uchar * xet, uchar * addr, uint prot)
1675 {
1676         Ethernet_t *et = (Ethernet_t *)xet;
1677         ushort myvlanid;
1678
1679         myvlanid = ntohs(NetOurVLAN);
1680         if (myvlanid == (ushort)-1)
1681                 myvlanid = VLAN_NONE;
1682
1683         memcpy (et->et_dest, addr, 6);
1684         memcpy (et->et_src, NetOurEther, 6);
1685         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1686         et->et_protlen = htons(prot);
1687                 return ETHER_HDR_SIZE;
1688         } else {
1689                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet;
1690
1691                 vet->vet_vlan_type = htons(PROT_VLAN);
1692                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1693                 vet->vet_type = htons(prot);
1694                 return VLAN_ETHER_HDR_SIZE;
1695         }
1696 }
1697
1698 void
1699 NetSetIP(volatile uchar * xip, IPaddr_t dest, int dport, int sport, int len)
1700 {
1701         IP_t *ip = (IP_t *)xip;
1702
1703         /*
1704          *      If the data is an odd number of bytes, zero the
1705          *      byte after the last byte so that the checksum
1706          *      will work.
1707          */
1708         if (len & 1)
1709                 xip[IP_HDR_SIZE + len] = 0;
1710
1711         /*
1712          *      Construct an IP and UDP header.
1713          *      (need to set no fragment bit - XXX)
1714          */
1715         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
1716         ip->ip_tos   = 0;
1717         ip->ip_len   = htons(IP_HDR_SIZE + len);
1718         ip->ip_id    = htons(NetIPID++);
1719         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1720         ip->ip_ttl   = 255;
1721         ip->ip_p     = 17;              /* UDP */
1722         ip->ip_sum   = 0;
1723         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
1724         NetCopyIP((void*)&ip->ip_dst, &dest);      /* - "" - */
1725         ip->udp_src  = htons(sport);
1726         ip->udp_dst  = htons(dport);
1727         ip->udp_len  = htons(8 + len);
1728         ip->udp_xsum = 0;
1729         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
1730 }
1731
1732 void copy_filename (char *dst, char *src, int size)
1733 {
1734         if (*src && (*src == '"')) {
1735                 ++src;
1736                 --size;
1737         }
1738
1739         while ((--size > 0) && *src && (*src != '"')) {
1740                 *dst++ = *src++;
1741         }
1742         *dst = '\0';
1743 }
1744
1745 #endif
1746
1747 void ip_to_string (IPaddr_t x, char *s)
1748 {
1749         x = ntohl (x);
1750         sprintf (s, "%d.%d.%d.%d",
1751                  (int) ((x >> 24) & 0xff),
1752                  (int) ((x >> 16) & 0xff),
1753                  (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
1754         );
1755 }
1756
1757 IPaddr_t string_to_ip(char *s)
1758 {
1759         IPaddr_t addr;
1760         char *e;
1761         int i;
1762
1763         if (s == NULL)
1764                 return(0);
1765
1766         for (addr=0, i=0; i<4; ++i) {
1767                 ulong val = s ? simple_strtoul(s, &e, 10) : 0;
1768                 addr <<= 8;
1769                 addr |= (val & 0xFF);
1770                 if (s) {
1771                         s = (*e) ? e+1 : e;
1772                 }
1773         }
1774
1775         return (htonl(addr));
1776 }
1777
1778 void VLAN_to_string(ushort x, char *s)
1779 {
1780         x = ntohs(x);
1781
1782         if (x == (ushort)-1)
1783                 x = VLAN_NONE;
1784
1785         if (x == VLAN_NONE)
1786                 strcpy(s, "none");
1787         else
1788                 sprintf(s, "%d", x & VLAN_IDMASK);
1789 }
1790
1791 ushort string_to_VLAN(char *s)
1792 {
1793         ushort id;
1794
1795         if (s == NULL)
1796                 return htons(VLAN_NONE);
1797
1798         if (*s < '0' || *s > '9')
1799                 id = VLAN_NONE;
1800         else
1801                 id = (ushort)simple_strtoul(s, NULL, 10);
1802
1803         return htons(id);
1804 }
1805
1806 IPaddr_t getenv_IPaddr (char *var)
1807 {
1808         return (string_to_ip(getenv(var)));
1809 }
1810
1811 ushort getenv_VLAN(char *var)
1812 {
1813         return (string_to_VLAN(getenv(var)));
1814 }