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
  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 int             NetState;               /* Network loop state                   */
 125 #ifdef CONFIG_NET_MULTI
 126 int             NetRestartWrap = 0;     /* Tried all network devices            */
 127 static int      NetRestarted = 0;       /* Network loop restarted               */
 128 static int      NetDevExists = 0;       /* At least one device configured       */
 129 #endif
 130
 131 char            BootFile[128];          /* Boot File name                       */
 132
 133 #if (CONFIG_COMMANDS & CFG_CMD_PING)
 134 IPaddr_t        NetPingIP;              /* the ip address to ping               */
 135
 136 static void PingStart(void);
 137 #endif
 138
 139 volatile uchar  PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 140
 141 volatile uchar *NetRxPackets[PKTBUFSRX]; /* Receive packets                     */
 142
 143 static rxhand_f *packetHandler;         /* Current RX packet handler            */
 144 static thand_f *timeHandler;            /* Current timeout handler              */
 145 static ulong    timeStart;              /* Time base value                      */
 146 static ulong    timeDelta;              /* Current timeout value                */
 147 volatile uchar *NetTxPacket = 0;        /* THE transmit packet                  */
 148
 149 static int net_check_prereq (proto_t protocol);
 150
 151 /**********************************************************************/
 152
 153 IPaddr_t        NetArpWaitPacketIP;
 154 IPaddr_t        NetArpWaitReplyIP;
 155 uchar          *NetArpWaitPacketMAC;    /* MAC address of waiting packet's destination  */
 156 uchar          *NetArpWaitTxPacket;     /* THE transmit packet                  */
 157 int             NetArpWaitTxPacketSize;
 158 uchar           NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
 159 ulong           NetArpWaitTimerStart;
 160 int             NetArpWaitTry;
 161
 162 void ArpRequest(void)
 163 {
 164         int i;
 165         volatile uchar *pkt;
 166         ARP_t * arp;
 167
 168 #ifdef ET_DEBUG
 169         printf("ARP broadcast %d\n", NetArpWaitTry);
 170 #endif
 171         pkt = NetTxPacket;
 172
 173         NetSetEther(pkt, NetBcastAddr, PROT_ARP);
 174         pkt += ETHER_HDR_SIZE;
 175
 176         arp = (ARP_t *)pkt;
 177
 178         arp->ar_hrd = htons(ARP_ETHER);
 179         arp->ar_pro = htons(PROT_IP);
 180         arp->ar_hln = 6;
 181         arp->ar_pln = 4;
 182         arp->ar_op  = htons(ARPOP_REQUEST);
 183
 184         memcpy (&arp->ar_data[0], NetOurEther, 6);      /* source ET addr       */
 185         NetWriteIP((uchar*)&arp->ar_data[6], NetOurIP); /* source IP addr       */
 186         for (i=10; i<16; ++i) {
 187                 arp->ar_data[i] = 0;                    /* dest ET addr = 0     */
 188         }
 189
 190         if((NetArpWaitPacketIP & NetOurSubnetMask) != (NetOurIP & NetOurSubnetMask)) {
 191             if (NetOurGatewayIP == 0) {
 192                 puts ("## Warning: gatewayip needed but not set\n");
 193             }
 194             NetArpWaitReplyIP = NetOurGatewayIP;
 195         } else
 196             NetArpWaitReplyIP = NetArpWaitPacketIP;
 197
 198         NetWriteIP((uchar*)&arp->ar_data[16], NetArpWaitReplyIP);
 199         (void) eth_send(NetTxPacket, ETHER_HDR_SIZE + ARP_HDR_SIZE);
 200 }
 201
 202 void ArpTimeoutCheck(void)
 203 {
 204         ulong t;
 205
 206         if (!NetArpWaitPacketIP)
 207                 return;
 208
 209         t = get_timer(0);
 210
 211         /* check for arp timeout */
 212         if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT * CFG_HZ) {
 213                 NetArpWaitTry++;
 214
 215                 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
 216                         puts ("\nARP Retry count exceeded; starting again\n");
 217                         NetArpWaitTry = 0;
 218                         NetStartAgain();
 219                 } else {
 220                         NetArpWaitTimerStart = t;
 221                         ArpRequest();
 222                 }
 223         }
 224 }
 225
 226 /**********************************************************************/
 227 /*
 228  *      Main network processing loop.
 229  */
 230
 231 int
 232 NetLoop(proto_t protocol)
 233 {
 234         DECLARE_GLOBAL_DATA_PTR;
 235
 236         bd_t *bd = gd->bd;
 237
 238 #ifdef CONFIG_NET_MULTI
 239         NetRestarted = 0;
 240         NetDevExists = 0;
 241 #endif
 242
 243         /* XXX problem with bss workaround */
 244         NetArpWaitPacketMAC = NULL;
 245         NetArpWaitTxPacket = NULL;
 246         NetArpWaitPacketIP = 0;
 247         NetArpWaitReplyIP = 0;
 248         NetArpWaitTxPacket = NULL;
 249         NetTxPacket = NULL;
 250
 251         if (!NetTxPacket) {
 252                 int     i;
 253
 254                 /*
 255                  *      Setup packet buffers, aligned correctly.
 256                  */
 257                 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
 258                 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
 259                 for (i = 0; i < PKTBUFSRX; i++) {
 260                         NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
 261                 }
 262
 263         }
 264
 265         if (!NetArpWaitTxPacket) {
 266                 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
 267                 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
 268                 NetArpWaitTxPacketSize = 0;
 269         }
 270
 271         eth_halt();
 272         if(eth_init(bd) < 0)
 273             return(-1);
 274
 275 restart:
 276 #ifdef CONFIG_NET_MULTI
 277         memcpy (NetOurEther, eth_get_dev()->enetaddr, 6);
 278 #else
 279         memcpy (NetOurEther, bd->bi_enetaddr, 6);
 280 #endif
 281
 282         NetState = NETLOOP_CONTINUE;
 283
 284         /*
 285          *      Start the ball rolling with the given start function.  From
 286          *      here on, this code is a state machine driven by received
 287          *      packets and timer events.
 288          */
 289
 290         switch (protocol) {
 291 #if (CONFIG_COMMANDS & CFG_CMD_NFS)
 292         case NFS:
 293 #endif
 294 #if (CONFIG_COMMANDS & CFG_CMD_PING)
 295         case PING:
 296 #endif
 297         case TFTP:
 298                 NetCopyIP(&NetOurIP, &bd->bi_ip_addr);
 299                 NetOurGatewayIP = getenv_IPaddr ("gatewayip");
 300                 NetOurSubnetMask= getenv_IPaddr ("netmask");
 301
 302                 switch (protocol) {
 303 #if (CONFIG_COMMANDS & CFG_CMD_NFS)
 304                 case NFS:
 305 #endif
 306                 case TFTP:
 307                         NetServerIP = getenv_IPaddr ("serverip");
 308                         break;
 309 #if (CONFIG_COMMANDS & CFG_CMD_PING)
 310                 case PING:
 311                         /* nothing */
 312                         break;
 313 #endif
 314                 default:
 315                         break;
 316                 }
 317
 318                 break;
 319         case BOOTP:
 320         case RARP:
 321                 /*
 322                  * initialize our IP addr to 0 in order to accept ANY
 323                  * IP addr assigned to us by the BOOTP / RARP server
 324                  */
 325                 NetOurIP = 0;
 326                 NetServerIP = getenv_IPaddr ("serverip");
 327                 break;
 328         default:
 329                 break;
 330         }
 331
 332         switch (net_check_prereq (protocol)) {
 333         case 1:
 334                 /* network not configured */
 335                 return (-1);
 336
 337 #ifdef CONFIG_NET_MULTI
 338         case 2:
 339                 /* network device not configured */
 340                 break;
 341 #endif /* CONFIG_NET_MULTI */
 342
 343         case 0:
 344 #ifdef CONFIG_NET_MULTI
 345                 NetDevExists = 1;
 346 #endif
 347                 switch (protocol) {
 348                 case TFTP:
 349                         /* always use ARP to get server ethernet address */
 350                         TftpStart();
 351                         break;
 352
 353 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
 354                 case DHCP:
 355                         /* Start with a clean slate... */
 356                         NetOurIP = 0;
 357                         NetServerIP = getenv_IPaddr ("serverip");
 358                         DhcpRequest();          /* Basically same as BOOTP */
 359                         break;
 360 #endif /* CFG_CMD_DHCP */
 361
 362                 case BOOTP:
 363                         BootpTry = 0;
 364                         BootpRequest ();
 365                         break;
 366
 367                 case RARP:
 368                         RarpTry = 0;
 369                         RarpRequest ();
 370                         break;
 371 #if (CONFIG_COMMANDS & CFG_CMD_PING)
 372                 case PING:
 373                         PingStart();
 374                         break;
 375 #endif
 376 #if (CONFIG_COMMANDS & CFG_CMD_NFS)
 377                 case NFS:
 378                         NfsStart();
 379                         break;
 380 #endif
 381                 default:
 382                         break;
 383                 }
 384
 385                 NetBootFileXferSize = 0;
 386                 break;
 387         }
 388
 389 #if defined(CONFIG_MII) || (CONFIG_COMMANDS & CFG_CMD_MII)
 390 #if defined(CFG_FAULT_ECHO_LINK_DOWN) && defined(CONFIG_STATUS_LED) && defined(STATUS_LED_RED)
 391         /*
 392          * Echo the inverted link state to the fault LED.
 393          */
 394         if(miiphy_link(CFG_FAULT_MII_ADDR)) {
 395                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 396         } else {
 397                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 398         }
 399 #endif /* CFG_FAULT_ECHO_LINK_DOWN, ... */
 400 #endif /* CONFIG_MII, ... */
 401
 402         /*
 403          *      Main packet reception loop.  Loop receiving packets until
 404          *      someone sets `NetQuit'.
 405          */
 406         for (;;) {
 407                 WATCHDOG_RESET();
 408 #ifdef CONFIG_SHOW_ACTIVITY
 409                 {
 410                         extern void show_activity(int arg);
 411                         show_activity(1);
 412                 }
 413 #endif
 414                 /*
 415                  *      Check the ethernet for a new packet.  The ethernet
 416                  *      receive routine will process it.
 417                  */
 418                         eth_rx();
 419
 420                 /*
 421                  *      Abort if ctrl-c was pressed.
 422                  */
 423                 if (ctrlc()) {
 424                         eth_halt();
 425                         printf("\nAbort\n");
 426                         return (-1);
 427                 }
 428
 429                 ArpTimeoutCheck();
 430
 431                 /*
 432                  *      Check for a timeout, and run the timeout handler
 433                  *      if we have one.
 434                  */
 435                 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
 436                         thand_f *x;
 437
 438 #if defined(CONFIG_MII) || (CONFIG_COMMANDS & CFG_CMD_MII)
 439 #if defined(CFG_FAULT_ECHO_LINK_DOWN) && defined(CONFIG_STATUS_LED) && defined(STATUS_LED_RED)
 440                         /*
 441                          * Echo the inverted link state to the fault LED.
 442                          */
 443                         if(miiphy_link(CFG_FAULT_MII_ADDR)) {
 444                                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 445                         } else {
 446                                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 447                         }
 448 #endif /* CFG_FAULT_ECHO_LINK_DOWN, ... */
 449 #endif /* CONFIG_MII, ... */
 450                         x = timeHandler;
 451                         timeHandler = (thand_f *)0;
 452                         (*x)();
 453                 }
 454
 455
 456                 switch (NetState) {
 457
 458                 case NETLOOP_RESTART:
 459 #ifdef CONFIG_NET_MULTI
 460                         NetRestarted = 1;
 461 #endif
 462                         goto restart;
 463
 464                 case NETLOOP_SUCCESS:
 465                         if (NetBootFileXferSize > 0) {
 466                                 char buf[10];
 467                                 printf("Bytes transferred = %ld (%lx hex)\n",
 468                                         NetBootFileXferSize,
 469                                         NetBootFileXferSize);
 470                                 sprintf(buf, "%lx", NetBootFileXferSize);
 471                                 setenv("filesize", buf);
 472                         }
 473                         eth_halt();
 474                         return NetBootFileXferSize;
 475
 476                 case NETLOOP_FAIL:
 477                         return (-1);
 478                 }
 479         }
 480 }
 481
 482 /**********************************************************************/
 483
 484 static void
 485 startAgainTimeout(void)
 486 {
 487         NetState = NETLOOP_RESTART;
 488 }
 489
 490 static void
 491 startAgainHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
 492 {
 493         /* Totally ignore the packet */
 494 }
 495
 496 void
 497 NetStartAgain(void)
 498 {
 499 #ifndef CONFIG_NET_MULTI
 500         NetSetTimeout(10 * CFG_HZ, startAgainTimeout);
 501         NetSetHandler(startAgainHandler);
 502 #else
 503         DECLARE_GLOBAL_DATA_PTR;
 504
 505         eth_halt();
 506         eth_try_another(!NetRestarted);
 507         eth_init(gd->bd);
 508         if (NetRestartWrap)
 509         {
 510                 NetRestartWrap = 0;
 511                 if (NetDevExists)
 512                 {
 513                         NetSetTimeout(10 * CFG_HZ, startAgainTimeout);
 514                         NetSetHandler(startAgainHandler);
 515                 }
 516                 else
 517                 {
 518                         NetState = NETLOOP_FAIL;
 519                 }
 520         }
 521         else
 522         {
 523                 NetState = NETLOOP_RESTART;
 524         }
 525 #endif
 526 }
 527
 528 /**********************************************************************/
 529 /*
 530  *      Miscelaneous bits.
 531  */
 532
 533 void
 534 NetSetHandler(rxhand_f * f)
 535 {
 536         packetHandler = f;
 537 }
 538
 539
 540 void
 541 NetSetTimeout(int iv, thand_f * f)
 542 {
 543         if (iv == 0) {
 544                 timeHandler = (thand_f *)0;
 545         } else {
 546                 timeHandler = f;
 547                 timeStart = get_timer(0);
 548                 timeDelta = iv;
 549         }
 550 }
 551
 552
 553 void
 554 NetSendPacket(volatile uchar * pkt, int len)
 555 {
 556         (void) eth_send(pkt, len);
 557 }
 558
 559 int
 560 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
 561 {
 562         /* convert to new style broadcast */
 563         if (dest == 0)
 564                 dest = 0xFFFFFFFF;
 565
 566         /* if broadcast, make the ether address a broadcast and don't do ARP */
 567         if (dest == 0xFFFFFFFF)
 568                 ether = NetBcastAddr;
 569
 570         /* if MAC address was not discovered yet, save the packet and do an ARP request */
 571         if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
 572
 573 #ifdef ET_DEBUG
 574                 printf("sending ARP for %08lx\n", dest);
 575 #endif
 576
 577                 NetArpWaitPacketIP = dest;
 578                 NetArpWaitPacketMAC = ether;
 579                 NetSetEther (NetArpWaitTxPacket, NetArpWaitPacketMAC, PROT_IP);
 580                 NetSetIP (NetArpWaitTxPacket + ETHER_HDR_SIZE, dest, dport, sport, len);
 581                 memcpy(NetArpWaitTxPacket + ETHER_HDR_SIZE + IP_HDR_SIZE,
 582                         (uchar *)NetTxPacket + ETHER_HDR_SIZE + IP_HDR_SIZE, len);
 583
 584                 /* size of the waiting packet */
 585                 NetArpWaitTxPacketSize = ETHER_HDR_SIZE + IP_HDR_SIZE + len;
 586
 587                 /* and do the ARP request */
 588                 NetArpWaitTry = 1;
 589                 NetArpWaitTimerStart = get_timer(0);
 590                 ArpRequest();
 591                 return 1;       /* waiting */
 592         }
 593
 594 #ifdef ET_DEBUG
 595         printf("sending UDP to %08lx/%02x:%02x:%02x:%02x:%02x:%02x\n",
 596                         dest, ether[0], ether[1], ether[2], ether[3], ether[4], ether[5]);
 597 #endif
 598
 599         NetSetEther (NetTxPacket, ether, PROT_IP);
 600         NetSetIP (NetTxPacket + ETHER_HDR_SIZE, dest, dport, sport, len);
 601         (void) eth_send(NetTxPacket, ETHER_HDR_SIZE + IP_HDR_SIZE + len);
 602
 603         return 0;       /* transmited */
 604 }
 605
 606 #if (CONFIG_COMMANDS & CFG_CMD_PING)
 607 static ushort PingSeqNo;
 608
 609 int PingSend(void)
 610 {
 611         static uchar mac[6];
 612         volatile IP_t *ip;
 613         volatile ushort *s;
 614
 615         /* XXX always send arp request */
 616
 617         memcpy(mac, NetEtherNullAddr, 6);
 618
 619 #ifdef ET_DEBUG
 620         printf("sending ARP for %08lx\n", NetPingIP);
 621 #endif
 622
 623         NetArpWaitPacketIP = NetPingIP;
 624         NetArpWaitPacketMAC = mac;
 625
 626         NetSetEther(NetArpWaitTxPacket, mac, PROT_IP);
 627
 628         ip = (volatile IP_t *)(NetArpWaitTxPacket + ETHER_HDR_SIZE);
 629
 630         /*
 631          *      Construct an IP and ICMP header.  (need to set no fragment bit - XXX)
 632          */
 633         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
 634         ip->ip_tos   = 0;
 635         ip->ip_len   = htons(IP_HDR_SIZE_NO_UDP + 8);
 636         ip->ip_id    = htons(NetIPID++);
 637         ip->ip_off   = htons(0x4000);   /* No fragmentation */
 638         ip->ip_ttl   = 255;
 639         ip->ip_p     = 0x01;            /* ICMP */
 640         ip->ip_sum   = 0;
 641         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
 642         NetCopyIP((void*)&ip->ip_dst, &NetPingIP);         /* - "" - */
 643         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
 644
 645         s = &ip->udp_src;               /* XXX ICMP starts here */
 646         s[0] = htons(0x0800);           /* echo-request, code */
 647         s[1] = 0;                       /* checksum */
 648         s[2] = 0;                       /* identifier */
 649         s[3] = htons(PingSeqNo++);      /* sequence number */
 650         s[1] = ~NetCksum((uchar *)s, 8/2);
 651
 652         /* size of the waiting packet */
 653         NetArpWaitTxPacketSize = ETHER_HDR_SIZE + IP_HDR_SIZE_NO_UDP + 8;
 654
 655         /* and do the ARP request */
 656         NetArpWaitTry = 1;
 657         NetArpWaitTimerStart = get_timer(0);
 658         ArpRequest();
 659         return 1;       /* waiting */
 660 }
 661
 662 static void
 663 PingTimeout (void)
 664 {
 665         eth_halt();
 666         NetState = NETLOOP_FAIL;        /* we did not get the reply */
 667 }
 668
 669 static void
 670 PingHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
 671 {
 672         IPaddr_t tmp;
 673         volatile IP_t *ip = (volatile IP_t *)pkt;
 674
 675         tmp = NetReadIP((void *)&ip->ip_src);
 676         if (tmp != NetPingIP)
 677                 return;
 678
 679         NetState = NETLOOP_SUCCESS;
 680 }
 681
 682 static void PingStart(void)
 683 {
 684         NetSetTimeout (10 * CFG_HZ, PingTimeout);
 685         NetSetHandler (PingHandler);
 686
 687         PingSend();
 688 }
 689
 690 #endif
 691
 692 void
 693 NetReceive(volatile uchar * pkt, int len)
 694 {
 695         Ethernet_t *et;
 696         IP_t    *ip;
 697         ARP_t   *arp;
 698         IPaddr_t tmp;
 699         int     x;
 700
 701         NetRxPkt = pkt;
 702         NetRxPktLen = len;
 703         et = (Ethernet_t *)pkt;
 704
 705         x = ntohs(et->et_protlen);
 706
 707         if (x < 1514) {
 708                 /*
 709                  *      Got a 802 packet.  Check the other protocol field.
 710                  */
 711                 x = ntohs(et->et_prot);
 712                 ip = (IP_t *)(pkt + E802_HDR_SIZE);
 713                 len -= E802_HDR_SIZE;
 714         } else {
 715                 ip = (IP_t *)(pkt + ETHER_HDR_SIZE);
 716                 len -= ETHER_HDR_SIZE;
 717         }
 718
 719 #ifdef ET_DEBUG
 720         printf("Receive from protocol 0x%x\n", x);
 721 #endif
 722
 723         switch (x) {
 724
 725         case PROT_ARP:
 726                 /*
 727                  * We have to deal with two types of ARP packets:
 728                  * - REQUEST packets will be answered by sending  our
 729                  *   IP address - if we know it.
 730                  * - REPLY packates are expected only after we asked
 731                  *   for the TFTP server's or the gateway's ethernet
 732                  *   address; so if we receive such a packet, we set
 733                  *   the server ethernet address
 734                  */
 735 #ifdef ET_DEBUG
 736                 printf("Got ARP\n");
 737 #endif
 738                 arp = (ARP_t *)ip;
 739                 if (len < ARP_HDR_SIZE) {
 740                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
 741                         return;
 742                 }
 743                 if (ntohs(arp->ar_hrd) != ARP_ETHER) {
 744                         return;
 745                 }
 746                 if (ntohs(arp->ar_pro) != PROT_IP) {
 747                         return;
 748                 }
 749                 if (arp->ar_hln != 6) {
 750                         return;
 751                 }
 752                 if (arp->ar_pln != 4) {
 753                         return;
 754                 }
 755
 756                 if (NetOurIP == 0) {
 757                         return;
 758                 }
 759
 760                 if (NetReadIP(&arp->ar_data[16]) != NetOurIP) {
 761                         return;
 762                 }
 763
 764                 switch (ntohs(arp->ar_op)) {
 765                 case ARPOP_REQUEST:             /* reply with our IP address    */
 766 #ifdef ET_DEBUG
 767                         printf("Got ARP REQUEST, return our IP\n");
 768 #endif
 769                         NetSetEther((uchar *)et, et->et_src, PROT_ARP);
 770                         arp->ar_op = htons(ARPOP_REPLY);
 771                         memcpy   (&arp->ar_data[10], &arp->ar_data[0], 6);
 772                         NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
 773                         memcpy   (&arp->ar_data[ 0], NetOurEther, 6);
 774                         NetCopyIP(&arp->ar_data[ 6], &NetOurIP);
 775                         (void) eth_send((uchar *)et, ((uchar *)arp-pkt) + ARP_HDR_SIZE);
 776                         return;
 777
 778                 case ARPOP_REPLY:               /* arp reply */
 779                         /* are we waiting for a reply */
 780                         if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
 781                                 break;
 782 #ifdef ET_DEBUG
 783                         printf("Got ARP REPLY, set server/gtwy eth addr (%02x:%02x:%02x:%02x:%02x:%02x)\n",
 784                                 arp->ar_data[0], arp->ar_data[1],
 785                                 arp->ar_data[2], arp->ar_data[3],
 786                                 arp->ar_data[4], arp->ar_data[5]);
 787 #endif
 788
 789                         tmp = NetReadIP(&arp->ar_data[6]);
 790
 791                         /* matched waiting packet's address */
 792                         if (tmp == NetArpWaitReplyIP) {
 793 #ifdef ET_DEBUG
 794                                 printf("Got it\n");
 795 #endif
 796                                 /* save address for later use */
 797                                 memcpy(NetArpWaitPacketMAC, &arp->ar_data[0], 6);
 798
 799                                 /* modify header, and transmit it */
 800                                 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6);
 801                                 (void) eth_send(NetArpWaitTxPacket, NetArpWaitTxPacketSize);
 802
 803                                 /* no arp request pending now */
 804                                 NetArpWaitPacketIP = 0;
 805                                 NetArpWaitTxPacketSize = 0;
 806                                 NetArpWaitPacketMAC = NULL;
 807
 808                         }
 809                         return;
 810                 default:
 811 #ifdef ET_DEBUG
 812                         printf("Unexpected ARP opcode 0x%x\n", ntohs(arp->ar_op));
 813 #endif
 814                         return;
 815                 }
 816
 817         case PROT_RARP:
 818 #ifdef ET_DEBUG
 819                 printf("Got RARP\n");
 820 #endif
 821                 arp = (ARP_t *)ip;
 822                 if (len < ARP_HDR_SIZE) {
 823                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
 824                         return;
 825                 }
 826
 827                 if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
 828                         (ntohs(arp->ar_hrd) != ARP_ETHER)   ||
 829                         (ntohs(arp->ar_pro) != PROT_IP)     ||
 830                         (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
 831
 832                         printf("invalid RARP header\n");
 833                 } else {
 834                         NetCopyIP(&NetOurIP,    &arp->ar_data[16]);
 835                         if (NetServerIP == 0)
 836                                 NetCopyIP(&NetServerIP, &arp->ar_data[ 6]);
 837                         memcpy (NetServerEther, &arp->ar_data[ 0], 6);
 838
 839                         (*packetHandler)(0,0,0,0);
 840                 }
 841                 break;
 842
 843         case PROT_IP:
 844 #ifdef ET_DEBUG
 845                 printf("Got IP\n");
 846 #endif
 847                 if (len < IP_HDR_SIZE) {
 848                         debug ("len bad %d < %d\n", len, IP_HDR_SIZE);
 849                         return;
 850                 }
 851                 if (len < ntohs(ip->ip_len)) {
 852                         printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
 853                         return;
 854                 }
 855                 len = ntohs(ip->ip_len);
 856 #ifdef ET_DEBUG
 857                 printf("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
 858 #endif
 859                 if ((ip->ip_hl_v & 0xf0) != 0x40) {
 860                         return;
 861                 }
 862                 if (ip->ip_off & htons(0x1fff)) { /* Can't deal w/ fragments */
 863                         return;
 864                 }
 865                 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
 866                         printf("checksum bad\n");
 867                         return;
 868                 }
 869                 tmp = NetReadIP(&ip->ip_dst);
 870                 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
 871                         return;
 872                 }
 873                 /*
 874                  * watch for ICMP host redirects
 875                  *
 876                  * There is no real handler code (yet). We just watch
 877                  * for ICMP host redirect messages. In case anybody
 878                  * sees these messages: please contact me
 879                  * (wd@denx.de), or - even better - send me the
 880                  * necessary fixes :-)
 881                  *
 882                  * Note: in all cases where I have seen this so far
 883                  * it was a problem with the router configuration,
 884                  * for instance when a router was configured in the
 885                  * BOOTP reply, but the TFTP server was on the same
 886                  * subnet. So this is probably a warning that your
 887                  * configuration might be wrong. But I'm not really
 888                  * sure if there aren't any other situations.
 889                  */
 890                 if (ip->ip_p == IPPROTO_ICMP) {
 891                         ICMP_t *icmph = (ICMP_t *)&(ip->udp_src);
 892
 893                         switch (icmph->type) {
 894                         case ICMP_REDIRECT:
 895                         if (icmph->code != ICMP_REDIR_HOST)
 896                                 return;
 897                         puts (" ICMP Host Redirect to ");
 898                         print_IPaddr(icmph->un.gateway);
 899                         putc(' ');
 900                                 break;
 901 #if (CONFIG_COMMANDS & CFG_CMD_PING)
 902                         case ICMP_ECHO_REPLY:
 903                                 /*
 904                                  *      IP header OK.  Pass the packet to the current handler.
 905                                  */
 906                                 /* XXX point to ip packet */
 907                                 (*packetHandler)((uchar *)ip, 0, 0, 0);
 908                                 break;
 909 #endif
 910                         default:
 911                                 return;
 912                         }
 913                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
 914                         return;
 915                 }
 916
 917                 /*
 918                  *      IP header OK.  Pass the packet to the current handler.
 919                  */
 920                 (*packetHandler)((uchar *)ip +IP_HDR_SIZE,
 921                                                 ntohs(ip->udp_dst),
 922                                                 ntohs(ip->udp_src),
 923                                                 ntohs(ip->udp_len) - 8);
 924
 925                 break;
 926         }
 927 }
 928
 929
 930 /**********************************************************************/
 931
 932 static int net_check_prereq (proto_t protocol)
 933 {
 934         switch (protocol) {
 935                         /* Fall through */
 936 #if (CONFIG_COMMANDS & CFG_CMD_PING)
 937         case PING:
 938                         if (NetPingIP == 0) {
 939                                 puts ("*** ERROR: ping address not given\n");
 940                                 return (1);
 941                         }
 942                         goto common;
 943 #endif
 944 #if (CONFIG_COMMANDS & CFG_CMD_NFS)
 945         case NFS:
 946 #endif
 947         case TFTP:
 948                         if (NetServerIP == 0) {
 949                                 puts ("*** ERROR: `serverip' not set\n");
 950                                 return (1);
 951                         }
 952
 953 #if (CONFIG_COMMANDS & CFG_CMD_PING)
 954                 common:
 955 #endif
 956
 957                         if (NetOurIP == 0) {
 958                                 puts ("*** ERROR: `ipaddr' not set\n");
 959                                 return (1);
 960                         }
 961                         /* Fall through */
 962
 963         case DHCP:
 964         case RARP:
 965         case BOOTP:
 966                         if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
 967 #ifdef CONFIG_NET_MULTI
 968                             extern int eth_get_dev_index (void);
 969                             int num = eth_get_dev_index();
 970
 971                             switch (num) {
 972                             case -1:
 973                                 puts ("*** ERROR: No ethernet found.\n");
 974                                 return (1);
 975                             case 0:
 976                                 puts ("*** ERROR: `ethaddr' not set\n");
 977                                 break;
 978                             default:
 979                                 printf ("*** ERROR: `eth%daddr' not set\n",
 980                                         num);
 981                                 break;
 982                             }
 983
 984                             NetStartAgain ();
 985                             return (2);
 986 #else
 987                             puts ("*** ERROR: `ethaddr' not set\n");
 988                             return (1);
 989 #endif
 990                         }
 991                         /* Fall through */
 992                 default:
 993                         return(0);
 994         }
 995         return (0);     /* OK */
 996 }
 997 /**********************************************************************/
 998
 999 int
1000 NetCksumOk(uchar * ptr, int len)
1001 {
1002         return !((NetCksum(ptr, len) + 1) & 0xfffe);
1003 }
1004
1005
1006 unsigned
1007 NetCksum(uchar * ptr, int len)
1008 {
1009         ulong   xsum;
1010
1011         xsum = 0;
1012         while (len-- > 0)
1013                 xsum += *((ushort *)ptr)++;
1014         xsum = (xsum & 0xffff) + (xsum >> 16);
1015         xsum = (xsum & 0xffff) + (xsum >> 16);
1016         return (xsum & 0xffff);
1017 }
1018
1019
1020 void
1021 NetSetEther(volatile uchar * xet, uchar * addr, uint prot)
1022 {
1023         Ethernet_t *et = (Ethernet_t *)xet;
1024
1025         memcpy (et->et_dest, addr, 6);
1026         memcpy (et->et_src, NetOurEther, 6);
1027         et->et_protlen = htons(prot);
1028 }
1029
1030
1031 void
1032 NetSetIP(volatile uchar * xip, IPaddr_t dest, int dport, int sport, int len)
1033 {
1034         volatile IP_t *ip = (IP_t *)xip;
1035
1036         /*
1037          *      If the data is an odd number of bytes, zero the
1038          *      byte after the last byte so that the checksum
1039          *      will work.
1040          */
1041         if (len & 1)
1042                 xip[IP_HDR_SIZE + len] = 0;
1043
1044         /*
1045          *      Construct an IP and UDP header.
1046                         (need to set no fragment bit - XXX)
1047          */
1048         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
1049         ip->ip_tos   = 0;
1050         ip->ip_len   = htons(IP_HDR_SIZE + len);
1051         ip->ip_id    = htons(NetIPID++);
1052         ip->ip_off   = htons(0x4000);   /* No fragmentation */
1053         ip->ip_ttl   = 255;
1054         ip->ip_p     = 17;              /* UDP */
1055         ip->ip_sum   = 0;
1056         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
1057         NetCopyIP((void*)&ip->ip_dst, &dest);      /* - "" - */
1058         ip->udp_src  = htons(sport);
1059         ip->udp_dst  = htons(dport);
1060         ip->udp_len  = htons(8 + len);
1061         ip->udp_xsum = 0;
1062         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
1063 }
1064
1065 void copy_filename (uchar *dst, uchar *src, int size)
1066 {
1067         if (*src && (*src == '"')) {
1068                 ++src;
1069                 --size;
1070         }
1071
1072         while ((--size > 0) && *src && (*src != '"')) {
1073                 *dst++ = *src++;
1074         }
1075         *dst = '\0';
1076 }
1077
1078 #endif /* CFG_CMD_NET */
1079
1080 void ip_to_string (IPaddr_t x, char *s)
1081 {
1082     x = ntohl(x);
1083     sprintf (s,"%d.%d.%d.%d",
1084         (int)((x >> 24) & 0xff),
1085         (int)((x >> 16) & 0xff),
1086         (int)((x >>  8) & 0xff),
1087         (int)((x >>  0) & 0xff)
1088     );
1089 }
1090
1091 IPaddr_t string_to_ip(char *s)
1092 {
1093         IPaddr_t addr;
1094         char *e;
1095         int i;
1096
1097         if (s == NULL)
1098                 return(0);
1099
1100         for (addr=0, i=0; i<4; ++i) {
1101                 ulong val = s ? simple_strtoul(s, &e, 10) : 0;
1102                 addr <<= 8;
1103                 addr |= (val & 0xFF);
1104                 if (s) {
1105                         s = (*e) ? e+1 : e;
1106                 }
1107         }
1108
1109         return (htonl(addr));
1110 }
1111
1112 void print_IPaddr (IPaddr_t x)
1113 {
1114     char tmp[16];
1115
1116     ip_to_string(x, tmp);
1117
1118     puts(tmp);
1119 }
1120
1121 IPaddr_t getenv_IPaddr (char *var)
1122 {
1123         return (string_to_ip(getenv(var)));
1124 }