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