net/net.c

   1 /*
   2  *      Copied from Linux Monitor (LiMon) - Networking.
   3  *
   4  *      Copyright 1994 - 2000 Neil Russell.
   5  *      (See License)
   6  *      Copyright 2000 Roland Borde
   7  *      Copyright 2000 Paolo Scaffardi
   8  *      Copyright 2000-2002 Wolfgang Denk, wd@denx.de
   9  */
  10
  11 /*
  12  * General Desription:
  13  *
  14  * The user interface supports commands for BOOTP, RARP, and TFTP.
  15  * Also, we support ARP internally. Depending on available data,
  16  * these interact as follows:
  17  *
  18  * BOOTP:
  19  *
  20  *      Prerequisites:  - own ethernet address
  21  *      We want:        - own IP address
  22  *                      - TFTP server IP address
  23  *                      - name of bootfile
  24  *      Next step:      ARP
  25  *
  26  * RARP:
  27  *
  28  *      Prerequisites:  - own ethernet address
  29  *      We want:        - own IP address
  30  *                      - TFTP server IP address
  31  *      Next step:      ARP
  32  *
  33  * ARP:
  34  *
  35  *      Prerequisites:  - own ethernet address
  36  *                      - own IP address
  37  *                      - TFTP server IP address
  38  *      We want:        - TFTP server ethernet address
  39  *      Next step:      TFTP
  40  *
  41  * DHCP:
  42  *
  43  *     Prerequisites:   - own ethernet address
  44  *     We want:         - IP, Netmask, ServerIP, Gateway IP
  45  *                      - bootfilename, lease time
  46  *     Next step:       - TFTP
  47  *
  48  * TFTP:
  49  *
  50  *      Prerequisites:  - own ethernet address
  51  *                      - own IP address
  52  *                      - TFTP server IP address
  53  *                      - TFTP server ethernet address
  54  *                      - name of bootfile (if unknown, we use a default name
  55  *                        derived from our own IP address)
  56  *      We want:        - load the boot file
  57  *      Next step:      none
  58  *
  59  * NFS:
  60  *
  61  *      Prerequisites:  - own ethernet address
  62  *                      - own IP address
  63  *                      - name of bootfile (if unknown, we use a default name
  64  *                        derived from our own IP address)
  65  *      We want:        - load the boot file
  66  *      Next step:      none
  67  *
  68  * SNTP:
  69  *
  70  *      Prerequisites:  - own ethernet address
  71  *                      - own IP address
  72  *      We want:        - network time
  73  *      Next step:      none
  74  */
  75
  76
  77 #include <common.h>
  78 #include <watchdog.h>
  79 #include <command.h>
  80 #include <net.h>
  81 #include "bootp.h"
  82 #include "tftp.h"
  83 #include "rarp.h"
  84 #include "nfs.h"
  85 #ifdef CONFIG_STATUS_LED
  86 #include <status_led.h>
  87 #include <miiphy.h>
  88 #endif
  89 #if defined(CONFIG_CMD_SNTP)
  90 #include "sntp.h"
  91 #endif
  92 #if defined(CONFIG_CDP_VERSION)
  93 #include <timestamp.h>
  94 #endif
  95 #if defined(CONFIG_CMD_DNS)
  96 #include "dns.h"
  97 #endif
  98
  99 #if defined(CONFIG_CMD_NET)
 100
 101 DECLARE_GLOBAL_DATA_PTR;
 102
 103 #ifndef CONFIG_ARP_TIMEOUT
 104 # define ARP_TIMEOUT            5000UL  /* Milliseconds before trying ARP again */
 105 #else
 106 # define ARP_TIMEOUT            CONFIG_ARP_TIMEOUT
 107 #endif
 108
 109
 110 #ifndef CONFIG_NET_RETRY_COUNT
 111 # define ARP_TIMEOUT_COUNT      5       /* # of timeouts before giving up  */
 112 #else
 113 # define ARP_TIMEOUT_COUNT      CONFIG_NET_RETRY_COUNT
 114 #endif
 115
 116 /** BOOTP EXTENTIONS **/
 117
 118 IPaddr_t        NetOurSubnetMask=0;             /* Our subnet mask (0=unknown)  */
 119 IPaddr_t        NetOurGatewayIP=0;              /* Our gateways IP address      */
 120 IPaddr_t        NetOurDNSIP=0;                  /* Our DNS IP address           */
 121 #if defined(CONFIG_BOOTP_DNS2)
 122 IPaddr_t        NetOurDNS2IP=0;                 /* Our 2nd DNS IP address       */
 123 #endif
 124 char            NetOurNISDomain[32]={0,};       /* Our NIS domain               */
 125 char            NetOurHostName[32]={0,};        /* Our hostname                 */
 126 char            NetOurRootPath[64]={0,};        /* Our bootpath                 */
 127 ushort          NetBootFileSize=0;              /* Our bootfile size in blocks  */
 128
 129 #ifdef CONFIG_MCAST_TFTP        /* Multicast TFTP */
 130 IPaddr_t Mcast_addr;
 131 #endif
 132
 133 /** END OF BOOTP EXTENTIONS **/
 134
 135 ulong           NetBootFileXferSize;    /* The actual transferred size of the bootfile (in bytes) */
 136 uchar           NetOurEther[6];         /* Our ethernet address                 */
 137 uchar           NetServerEther[6] =     /* Boot server enet address             */
 138                         { 0, 0, 0, 0, 0, 0 };
 139 IPaddr_t        NetOurIP;               /* Our IP addr (0 = unknown)            */
 140 IPaddr_t        NetServerIP;            /* Server IP addr (0 = unknown)         */
 141 volatile uchar *NetRxPacket;            /* Current receive packet               */
 142 int             NetRxPacketLen;         /* Current rx packet length             */
 143 unsigned        NetIPID;                /* IP packet ID                         */
 144 uchar           NetBcastAddr[6] =       /* Ethernet bcast address               */
 145                         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 146 uchar           NetEtherNullAddr[6] =
 147                         { 0, 0, 0, 0, 0, 0 };
 148 #ifdef CONFIG_API
 149 void            (*push_packet)(volatile void *, int len) = 0;
 150 #endif
 151 #if defined(CONFIG_CMD_CDP)
 152 uchar           NetCDPAddr[6] =         /* Ethernet bcast address               */
 153                         { 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc };
 154 #endif
 155 int             NetState;               /* Network loop state                   */
 156 #ifdef CONFIG_NET_MULTI
 157 int             NetRestartWrap = 0;     /* Tried all network devices            */
 158 static int      NetRestarted = 0;       /* Network loop restarted               */
 159 static int      NetDevExists = 0;       /* At least one device configured       */
 160 #endif
 161
 162 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
 163 ushort          NetOurVLAN = 0xFFFF;            /* default is without VLAN      */
 164 ushort          NetOurNativeVLAN = 0xFFFF;      /* ditto                        */
 165
 166 char            BootFile[128];          /* Boot File name                       */
 167
 168 #if defined(CONFIG_CMD_PING)
 169 IPaddr_t        NetPingIP;              /* the ip address to ping               */
 170
 171 static void PingStart(void);
 172 #endif
 173
 174 #if defined(CONFIG_CMD_CDP)
 175 static void CDPStart(void);
 176 #endif
 177
 178 #if defined(CONFIG_CMD_SNTP)
 179 IPaddr_t        NetNtpServerIP;         /* NTP server IP address                */
 180 int             NetTimeOffset=0;        /* offset time from UTC                 */
 181 #endif
 182
 183 #ifdef CONFIG_NETCONSOLE
 184 void NcStart(void);
 185 int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len);
 186 #endif
 187
 188 volatile uchar  PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 189
 190 volatile uchar *NetRxPackets[PKTBUFSRX]; /* Receive packets                     */
 191
 192 static rxhand_f *packetHandler;         /* Current RX packet handler            */
 193 static thand_f *timeHandler;            /* Current timeout handler              */
 194 static ulong    timeStart;              /* Time base value                      */
 195 static ulong    timeDelta;              /* Current timeout value                */
 196 volatile uchar *NetTxPacket = 0;        /* THE transmit packet                  */
 197
 198 static int net_check_prereq (proto_t protocol);
 199
 200 /**********************************************************************/
 201
 202 IPaddr_t        NetArpWaitPacketIP;
 203 IPaddr_t        NetArpWaitReplyIP;
 204 uchar          *NetArpWaitPacketMAC;    /* MAC address of waiting packet's destination  */
 205 uchar          *NetArpWaitTxPacket;     /* THE transmit packet                  */
 206 int             NetArpWaitTxPacketSize;
 207 uchar           NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
 208 ulong           NetArpWaitTimerStart;
 209 int             NetArpWaitTry;
 210
 211 void ArpRequest (void)
 212 {
 213         int i;
 214         volatile uchar *pkt;
 215         ARP_t *arp;
 216
 217         debug("ARP broadcast %d\n", NetArpWaitTry);
 218
 219         pkt = NetTxPacket;
 220
 221         pkt += NetSetEther (pkt, NetBcastAddr, PROT_ARP);
 222
 223         arp = (ARP_t *) pkt;
 224
 225         arp->ar_hrd = htons (ARP_ETHER);
 226         arp->ar_pro = htons (PROT_IP);
 227         arp->ar_hln = 6;
 228         arp->ar_pln = 4;
 229         arp->ar_op = htons (ARPOP_REQUEST);
 230
 231         memcpy (&arp->ar_data[0], NetOurEther, 6);              /* source ET addr       */
 232         NetWriteIP ((uchar *) & arp->ar_data[6], NetOurIP);     /* source IP addr       */
 233         for (i = 10; i < 16; ++i) {
 234                 arp->ar_data[i] = 0;                            /* dest ET addr = 0     */
 235         }
 236
 237         if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
 238             (NetOurIP & NetOurSubnetMask)) {
 239                 if (NetOurGatewayIP == 0) {
 240                         puts ("## Warning: gatewayip needed but not set\n");
 241                         NetArpWaitReplyIP = NetArpWaitPacketIP;
 242                 } else {
 243                         NetArpWaitReplyIP = NetOurGatewayIP;
 244                 }
 245         } else {
 246                 NetArpWaitReplyIP = NetArpWaitPacketIP;
 247         }
 248
 249         NetWriteIP ((uchar *) & arp->ar_data[16], NetArpWaitReplyIP);
 250         (void) eth_send (NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
 251 }
 252
 253 void ArpTimeoutCheck(void)
 254 {
 255         ulong t;
 256
 257         if (!NetArpWaitPacketIP)
 258                 return;
 259
 260         t = get_timer(0);
 261
 262         /* check for arp timeout */
 263         if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT) {
 264                 NetArpWaitTry++;
 265
 266                 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
 267                         puts ("\nARP Retry count exceeded; starting again\n");
 268                         NetArpWaitTry = 0;
 269                         NetStartAgain();
 270                 } else {
 271                         NetArpWaitTimerStart = t;
 272                         ArpRequest();
 273                 }
 274         }
 275 }
 276
 277 static void
 278 NetInitLoop(proto_t protocol)
 279 {
 280         static int env_changed_id = 0;
 281         bd_t *bd = gd->bd;
 282         int env_id = get_env_id ();
 283
 284         /* update only when the environment has changed */
 285         if (env_changed_id != env_id) {
 286                 NetCopyIP(&NetOurIP, &bd->bi_ip_addr);
 287                 NetOurGatewayIP = getenv_IPaddr ("gatewayip");
 288                 NetOurSubnetMask= getenv_IPaddr ("netmask");
 289                 NetServerIP = getenv_IPaddr ("serverip");
 290                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 291                 NetOurVLAN = getenv_VLAN("vlan");
 292 #if defined(CONFIG_CMD_DNS)
 293                 NetOurDNSIP = getenv_IPaddr("dnsip");
 294 #endif
 295                 env_changed_id = env_id;
 296         }
 297
 298         return;
 299 }
 300
 301 /**********************************************************************/
 302 /*
 303  *      Main network processing loop.
 304  */
 305
 306 int
 307 NetLoop(proto_t protocol)
 308 {
 309         bd_t *bd = gd->bd;
 310
 311 #ifdef CONFIG_NET_MULTI
 312         NetRestarted = 0;
 313         NetDevExists = 0;
 314 #endif
 315
 316         /* XXX problem with bss workaround */
 317         NetArpWaitPacketMAC = NULL;
 318         NetArpWaitTxPacket = NULL;
 319         NetArpWaitPacketIP = 0;
 320         NetArpWaitReplyIP = 0;
 321         NetArpWaitTxPacket = NULL;
 322         NetTxPacket = NULL;
 323
 324         if (!NetTxPacket) {
 325                 int     i;
 326                 /*
 327                  *      Setup packet buffers, aligned correctly.
 328                  */
 329                 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
 330                 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
 331                 for (i = 0; i < PKTBUFSRX; i++) {
 332                         NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
 333                 }
 334         }
 335
 336         if (!NetArpWaitTxPacket) {
 337                 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
 338                 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
 339                 NetArpWaitTxPacketSize = 0;
 340         }
 341
 342         eth_halt();
 343 #ifdef CONFIG_NET_MULTI
 344         eth_set_current();
 345 #endif
 346         if (eth_init(bd) < 0) {
 347                 eth_halt();
 348                 return(-1);
 349         }
 350
 351 restart:
 352 #ifdef CONFIG_NET_MULTI
 353         memcpy (NetOurEther, eth_get_dev()->enetaddr, 6);
 354 #else
 355         eth_getenv_enetaddr("ethaddr", NetOurEther);
 356 #endif
 357
 358         NetState = NETLOOP_CONTINUE;
 359
 360         /*
 361          *      Start the ball rolling with the given start function.  From
 362          *      here on, this code is a state machine driven by received
 363          *      packets and timer events.
 364          */
 365         NetInitLoop(protocol);
 366
 367         switch (net_check_prereq (protocol)) {
 368         case 1:
 369                 /* network not configured */
 370                 eth_halt();
 371                 return (-1);
 372
 373 #ifdef CONFIG_NET_MULTI
 374         case 2:
 375                 /* network device not configured */
 376                 break;
 377 #endif /* CONFIG_NET_MULTI */
 378
 379         case 0:
 380 #ifdef CONFIG_NET_MULTI
 381                 NetDevExists = 1;
 382 #endif
 383                 switch (protocol) {
 384                 case TFTP:
 385                         /* always use ARP to get server ethernet address */
 386                         TftpStart();
 387                         break;
 388
 389 #if defined(CONFIG_CMD_DHCP)
 390                 case DHCP:
 391                         BootpTry = 0;
 392                         NetOurIP = 0;
 393                         DhcpRequest();          /* Basically same as BOOTP */
 394                         break;
 395 #endif
 396
 397                 case BOOTP:
 398                         BootpTry = 0;
 399                         NetOurIP = 0;
 400                         BootpRequest ();
 401                         break;
 402
 403                 case RARP:
 404                         RarpTry = 0;
 405                         NetOurIP = 0;
 406                         RarpRequest ();
 407                         break;
 408 #if defined(CONFIG_CMD_PING)
 409                 case PING:
 410                         PingStart();
 411                         break;
 412 #endif
 413 #if defined(CONFIG_CMD_NFS)
 414                 case NFS:
 415                         NfsStart();
 416                         break;
 417 #endif
 418 #if defined(CONFIG_CMD_CDP)
 419                 case CDP:
 420                         CDPStart();
 421                         break;
 422 #endif
 423 #ifdef CONFIG_NETCONSOLE
 424                 case NETCONS:
 425                         NcStart();
 426                         break;
 427 #endif
 428 #if defined(CONFIG_CMD_SNTP)
 429                 case SNTP:
 430                         SntpStart();
 431                         break;
 432 #endif
 433 #if defined(CONFIG_CMD_DNS)
 434                 case DNS:
 435                         DnsStart();
 436                         break;
 437 #endif
 438                 default:
 439                         break;
 440                 }
 441
 442                 NetBootFileXferSize = 0;
 443                 break;
 444         }
 445
 446 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 447 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && defined(CONFIG_STATUS_LED) && defined(STATUS_LED_RED)
 448         /*
 449          * Echo the inverted link state to the fault LED.
 450          */
 451         if(miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) {
 452                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 453         } else {
 454                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 455         }
 456 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 457 #endif /* CONFIG_MII, ... */
 458
 459         /*
 460          *      Main packet reception loop.  Loop receiving packets until
 461          *      someone sets `NetState' to a state that terminates.
 462          */
 463         for (;;) {
 464                 WATCHDOG_RESET();
 465 #ifdef CONFIG_SHOW_ACTIVITY
 466                 {
 467                         extern void show_activity(int arg);
 468                         show_activity(1);
 469                 }
 470 #endif
 471                 /*
 472                  *      Check the ethernet for a new packet.  The ethernet
 473                  *      receive routine will process it.
 474                  */
 475                 eth_rx();
 476
 477                 /*
 478                  *      Abort if ctrl-c was pressed.
 479                  */
 480                 if (ctrlc()) {
 481                         eth_halt();
 482                         puts ("\nAbort\n");
 483                         return (-1);
 484                 }
 485
 486                 ArpTimeoutCheck();
 487
 488                 /*
 489                  *      Check for a timeout, and run the timeout handler
 490                  *      if we have one.
 491                  */
 492                 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
 493                         thand_f *x;
 494
 495 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 496 #  if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \
 497       defined(CONFIG_STATUS_LED) &&        \
 498       defined(STATUS_LED_RED)
 499                         /*
 500                          * Echo the inverted link state to the fault LED.
 501                          */
 502                         if(miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) {
 503                                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 504                         } else {
 505                                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 506                         }
 507 #  endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 508 #endif /* CONFIG_MII, ... */
 509                         x = timeHandler;
 510                         timeHandler = (thand_f *)0;
 511                         (*x)();
 512                 }
 513
 514
 515                 switch (NetState) {
 516
 517                 case NETLOOP_RESTART:
 518 #ifdef CONFIG_NET_MULTI
 519                         NetRestarted = 1;
 520 #endif
 521                         goto restart;
 522
 523                 case NETLOOP_SUCCESS:
 524                         if (NetBootFileXferSize > 0) {
 525                                 char buf[20];
 526                                 printf("Bytes transferred = %ld (%lx hex)\n",
 527                                         NetBootFileXferSize,
 528                                         NetBootFileXferSize);
 529                                 sprintf(buf, "%lX", NetBootFileXferSize);
 530                                 setenv("filesize", buf);
 531
 532                                 sprintf(buf, "%lX", (unsigned long)load_addr);
 533                                 setenv("fileaddr", buf);
 534                         }
 535                         eth_halt();
 536                         return NetBootFileXferSize;
 537
 538                 case NETLOOP_FAIL:
 539                         return (-1);
 540                 }
 541         }
 542 }
 543
 544 /**********************************************************************/
 545
 546 static void
 547 startAgainTimeout(void)
 548 {
 549         NetState = NETLOOP_RESTART;
 550 }
 551
 552 static void
 553 startAgainHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
 554 {
 555         /* Totally ignore the packet */
 556 }
 557
 558 void NetStartAgain (void)
 559 {
 560         char *nretry;
 561         int noretry = 0, once = 0;
 562
 563         if ((nretry = getenv ("netretry")) != NULL) {
 564                 noretry = (strcmp (nretry, "no") == 0);
 565                 once = (strcmp (nretry, "once") == 0);
 566         }
 567         if (noretry) {
 568                 eth_halt ();
 569                 NetState = NETLOOP_FAIL;
 570                 return;
 571         }
 572 #ifndef CONFIG_NET_MULTI
 573         NetSetTimeout (10000UL, startAgainTimeout);
 574         NetSetHandler (startAgainHandler);
 575 #else   /* !CONFIG_NET_MULTI*/
 576         eth_halt ();
 577 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
 578         eth_try_another (!NetRestarted);
 579 #endif
 580         eth_init (gd->bd);
 581         if (NetRestartWrap) {
 582                 NetRestartWrap = 0;
 583                 if (NetDevExists && !once) {
 584                         NetSetTimeout (10000UL, startAgainTimeout);
 585                         NetSetHandler (startAgainHandler);
 586                 } else {
 587                         NetState = NETLOOP_FAIL;
 588                 }
 589         } else {
 590                 NetState = NETLOOP_RESTART;
 591         }
 592 #endif  /* CONFIG_NET_MULTI */
 593 }
 594
 595 /**********************************************************************/
 596 /*
 597  *      Miscelaneous bits.
 598  */
 599
 600 void
 601 NetSetHandler(rxhand_f * f)
 602 {
 603         packetHandler = f;
 604 }
 605
 606
 607 void
 608 NetSetTimeout(ulong iv, thand_f * f)
 609 {
 610         if (iv == 0) {
 611                 timeHandler = (thand_f *)0;
 612         } else {
 613                 timeHandler = f;
 614                 timeStart = get_timer(0);
 615                 timeDelta = iv;
 616         }
 617 }
 618
 619
 620 void
 621 NetSendPacket(volatile uchar * pkt, int len)
 622 {
 623         (void) eth_send(pkt, len);
 624 }
 625
 626 int
 627 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
 628 {
 629         uchar *pkt;
 630
 631         /* convert to new style broadcast */
 632         if (dest == 0)
 633                 dest = 0xFFFFFFFF;
 634
 635         /* if broadcast, make the ether address a broadcast and don't do ARP */
 636         if (dest == 0xFFFFFFFF)
 637                 ether = NetBcastAddr;
 638
 639         /* if MAC address was not discovered yet, save the packet and do an ARP request */
 640         if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
 641
 642                 debug("sending ARP for %08lx\n", dest);
 643
 644                 NetArpWaitPacketIP = dest;
 645                 NetArpWaitPacketMAC = ether;
 646
 647                 pkt = NetArpWaitTxPacket;
 648                 pkt += NetSetEther (pkt, NetArpWaitPacketMAC, PROT_IP);
 649
 650                 NetSetIP (pkt, dest, dport, sport, len);
 651                 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len);
 652
 653                 /* size of the waiting packet */
 654                 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE + len;
 655
 656                 /* and do the ARP request */
 657                 NetArpWaitTry = 1;
 658                 NetArpWaitTimerStart = get_timer(0);
 659                 ArpRequest();
 660                 return 1;       /* waiting */
 661         }
 662
 663         debug("sending UDP to %08lx/%pM\n", dest, ether);
 664
 665         pkt = (uchar *)NetTxPacket;
 666         pkt += NetSetEther (pkt, ether, PROT_IP);
 667         NetSetIP (pkt, dest, dport, sport, len);
 668         (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len);
 669
 670         return 0;       /* transmitted */
 671 }
 672
 673 #if defined(CONFIG_CMD_PING)
 674 static ushort PingSeqNo;
 675
 676 int PingSend(void)
 677 {
 678         static uchar mac[6];
 679         volatile IP_t *ip;
 680         volatile ushort *s;
 681         uchar *pkt;
 682
 683         /* XXX always send arp request */
 684
 685         memcpy(mac, NetEtherNullAddr, 6);
 686
 687         debug("sending ARP for %08lx\n", NetPingIP);
 688
 689         NetArpWaitPacketIP = NetPingIP;
 690         NetArpWaitPacketMAC = mac;
 691
 692         pkt = NetArpWaitTxPacket;
 693         pkt += NetSetEther(pkt, mac, PROT_IP);
 694
 695         ip = (volatile IP_t *)pkt;
 696
 697         /*
 698          *      Construct an IP and ICMP header.  (need to set no fragment bit - XXX)
 699          */
 700         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
 701         ip->ip_tos   = 0;
 702         ip->ip_len   = htons(IP_HDR_SIZE_NO_UDP + 8);
 703         ip->ip_id    = htons(NetIPID++);
 704         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
 705         ip->ip_ttl   = 255;
 706         ip->ip_p     = 0x01;            /* ICMP */
 707         ip->ip_sum   = 0;
 708         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
 709         NetCopyIP((void*)&ip->ip_dst, &NetPingIP);         /* - "" - */
 710         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
 711
 712         s = &ip->udp_src;               /* XXX ICMP starts here */
 713         s[0] = htons(0x0800);           /* echo-request, code */
 714         s[1] = 0;                       /* checksum */
 715         s[2] = 0;                       /* identifier */
 716         s[3] = htons(PingSeqNo++);      /* sequence number */
 717         s[1] = ~NetCksum((uchar *)s, 8/2);
 718
 719         /* size of the waiting packet */
 720         NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8;
 721
 722         /* and do the ARP request */
 723         NetArpWaitTry = 1;
 724         NetArpWaitTimerStart = get_timer(0);
 725         ArpRequest();
 726         return 1;       /* waiting */
 727 }
 728
 729 static void
 730 PingTimeout (void)
 731 {
 732         eth_halt();
 733         NetState = NETLOOP_FAIL;        /* we did not get the reply */
 734 }
 735
 736 static void
 737 PingHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
 738 {
 739         IPaddr_t tmp;
 740         volatile IP_t *ip = (volatile IP_t *)pkt;
 741
 742         tmp = NetReadIP((void *)&ip->ip_src);
 743         if (tmp != NetPingIP)
 744                 return;
 745
 746         NetState = NETLOOP_SUCCESS;
 747 }
 748
 749 static void PingStart(void)
 750 {
 751 #if defined(CONFIG_NET_MULTI)
 752         printf ("Using %s device\n", eth_get_name());
 753 #endif  /* CONFIG_NET_MULTI */
 754         NetSetTimeout (10000UL, PingTimeout);
 755         NetSetHandler (PingHandler);
 756
 757         PingSend();
 758 }
 759 #endif
 760
 761 #if defined(CONFIG_CMD_CDP)
 762
 763 #define CDP_DEVICE_ID_TLV               0x0001
 764 #define CDP_ADDRESS_TLV                 0x0002
 765 #define CDP_PORT_ID_TLV                 0x0003
 766 #define CDP_CAPABILITIES_TLV            0x0004
 767 #define CDP_VERSION_TLV                 0x0005
 768 #define CDP_PLATFORM_TLV                0x0006
 769 #define CDP_NATIVE_VLAN_TLV             0x000a
 770 #define CDP_APPLIANCE_VLAN_TLV          0x000e
 771 #define CDP_TRIGGER_TLV                 0x000f
 772 #define CDP_POWER_CONSUMPTION_TLV       0x0010
 773 #define CDP_SYSNAME_TLV                 0x0014
 774 #define CDP_SYSOBJECT_TLV               0x0015
 775 #define CDP_MANAGEMENT_ADDRESS_TLV      0x0016
 776
 777 #define CDP_TIMEOUT                     250UL   /* one packet every 250ms */
 778
 779 static int CDPSeq;
 780 static int CDPOK;
 781
 782 ushort CDPNativeVLAN;
 783 ushort CDPApplianceVLAN;
 784
 785 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 0x00 };
 786
 787 static ushort CDP_compute_csum(const uchar *buff, ushort len)
 788 {
 789         ushort csum;
 790         int     odd;
 791         ulong   result = 0;
 792         ushort  leftover;
 793         ushort *p;
 794
 795         if (len > 0) {
 796                 odd = 1 & (ulong)buff;
 797                 if (odd) {
 798                         result = *buff << 8;
 799                         len--;
 800                         buff++;
 801                 }
 802                 while (len > 1) {
 803                         p = (ushort *)buff;
 804                         result += *p++;
 805                         buff = (uchar *)p;
 806                         if (result & 0x80000000)
 807                                 result = (result & 0xFFFF) + (result >> 16);
 808                         len -= 2;
 809                 }
 810                 if (len) {
 811                         leftover = (signed short)(*(const signed char *)buff);
 812                         /* CISCO SUCKS big time! (and blows too):
 813                          * CDP uses the IP checksum algorithm with a twist;
 814                          * for the last byte it *sign* extends and sums.
 815                          */
 816                         result = (result & 0xffff0000) | ((result + leftover) & 0x0000ffff);
 817                 }
 818                 while (result >> 16)
 819                         result = (result & 0xFFFF) + (result >> 16);
 820
 821                 if (odd)
 822                         result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
 823         }
 824
 825         /* add up 16-bit and 17-bit words for 17+c bits */
 826         result = (result & 0xffff) + (result >> 16);
 827         /* add up 16-bit and 2-bit for 16+c bit */
 828         result = (result & 0xffff) + (result >> 16);
 829         /* add up carry.. */
 830         result = (result & 0xffff) + (result >> 16);
 831
 832         /* negate */
 833         csum = ~(ushort)result;
 834
 835         /* run time endian detection */
 836         if (csum != htons(csum))        /* little endian */
 837                 csum = htons(csum);
 838
 839         return csum;
 840 }
 841
 842 int CDPSendTrigger(void)
 843 {
 844         volatile uchar *pkt;
 845         volatile ushort *s;
 846         volatile ushort *cp;
 847         Ethernet_t *et;
 848         int len;
 849         ushort chksum;
 850 #if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID)   || \
 851     defined(CONFIG_CDP_VERSION)   || defined(CONFIG_CDP_PLATFORM)
 852         char buf[32];
 853 #endif
 854
 855         pkt = NetTxPacket;
 856         et = (Ethernet_t *)pkt;
 857
 858         /* NOTE: trigger sent not on any VLAN */
 859
 860         /* form ethernet header */
 861         memcpy(et->et_dest, NetCDPAddr, 6);
 862         memcpy(et->et_src, NetOurEther, 6);
 863
 864         pkt += ETHER_HDR_SIZE;
 865
 866         /* SNAP header */
 867         memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr));
 868         pkt += sizeof(CDP_SNAP_hdr);
 869
 870         /* CDP header */
 871         *pkt++ = 0x02;                          /* CDP version 2 */
 872         *pkt++ = 180;                           /* TTL */
 873         s = (volatile ushort *)pkt;
 874         cp = s;
 875         *s++ = htons(0);                        /* checksum (0 for later calculation) */
 876
 877         /* CDP fields */
 878 #ifdef CONFIG_CDP_DEVICE_ID
 879         *s++ = htons(CDP_DEVICE_ID_TLV);
 880         *s++ = htons(CONFIG_CDP_DEVICE_ID);
 881         sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%pm", NetOurEther);
 882         memcpy((uchar *)s, buf, 16);
 883         s += 16 / 2;
 884 #endif
 885
 886 #ifdef CONFIG_CDP_PORT_ID
 887         *s++ = htons(CDP_PORT_ID_TLV);
 888         memset(buf, 0, sizeof(buf));
 889         sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index());
 890         len = strlen(buf);
 891         if (len & 1)    /* make it even */
 892                 len++;
 893         *s++ = htons(len + 4);
 894         memcpy((uchar *)s, buf, len);
 895         s += len / 2;
 896 #endif
 897
 898 #ifdef CONFIG_CDP_CAPABILITIES
 899         *s++ = htons(CDP_CAPABILITIES_TLV);
 900         *s++ = htons(8);
 901         *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES);
 902         s += 2;
 903 #endif
 904
 905 #ifdef CONFIG_CDP_VERSION
 906         *s++ = htons(CDP_VERSION_TLV);
 907         memset(buf, 0, sizeof(buf));
 908         strcpy(buf, CONFIG_CDP_VERSION);
 909         len = strlen(buf);
 910         if (len & 1)    /* make it even */
 911                 len++;
 912         *s++ = htons(len + 4);
 913         memcpy((uchar *)s, buf, len);
 914         s += len / 2;
 915 #endif
 916
 917 #ifdef CONFIG_CDP_PLATFORM
 918         *s++ = htons(CDP_PLATFORM_TLV);
 919         memset(buf, 0, sizeof(buf));
 920         strcpy(buf, CONFIG_CDP_PLATFORM);
 921         len = strlen(buf);
 922         if (len & 1)    /* make it even */
 923                 len++;
 924         *s++ = htons(len + 4);
 925         memcpy((uchar *)s, buf, len);
 926         s += len / 2;
 927 #endif
 928
 929 #ifdef CONFIG_CDP_TRIGGER
 930         *s++ = htons(CDP_TRIGGER_TLV);
 931         *s++ = htons(8);
 932         *(ulong *)s = htonl(CONFIG_CDP_TRIGGER);
 933         s += 2;
 934 #endif
 935
 936 #ifdef CONFIG_CDP_POWER_CONSUMPTION
 937         *s++ = htons(CDP_POWER_CONSUMPTION_TLV);
 938         *s++ = htons(6);
 939         *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION);
 940 #endif
 941
 942         /* length of ethernet packet */
 943         len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE);
 944         et->et_protlen = htons(len);
 945
 946         len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr);
 947         chksum = CDP_compute_csum((uchar *)NetTxPacket + len, (uchar *)s - (NetTxPacket + len));
 948         if (chksum == 0)
 949                 chksum = 0xFFFF;
 950         *cp = htons(chksum);
 951
 952         (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket);
 953         return 0;
 954 }
 955
 956 static void
 957 CDPTimeout (void)
 958 {
 959         CDPSeq++;
 960
 961         if (CDPSeq < 3) {
 962                 NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
 963                 CDPSendTrigger();
 964                 return;
 965         }
 966
 967         /* if not OK try again */
 968         if (!CDPOK)
 969                 NetStartAgain();
 970         else
 971                 NetState = NETLOOP_SUCCESS;
 972 }
 973
 974 static void
 975 CDPDummyHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
 976 {
 977         /* nothing */
 978 }
 979
 980 static void
 981 CDPHandler(const uchar * pkt, unsigned len)
 982 {
 983         const uchar *t;
 984         const ushort *ss;
 985         ushort type, tlen;
 986         uchar applid;
 987         ushort vlan, nvlan;
 988
 989         /* minimum size? */
 990         if (len < sizeof(CDP_SNAP_hdr) + 4)
 991                 goto pkt_short;
 992
 993         /* check for valid CDP SNAP header */
 994         if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0)
 995                 return;
 996
 997         pkt += sizeof(CDP_SNAP_hdr);
 998         len -= sizeof(CDP_SNAP_hdr);
 999
1000         /* Version of CDP protocol must be >= 2 and TTL != 0 */
1001         if (pkt[0] < 0x02 || pkt[1] == 0)
1002                 return;
1003
1004         /* if version is greater than 0x02 maybe we'll have a problem; output a warning */
1005         if (pkt[0] != 0x02)
1006                 printf("** WARNING: CDP packet received with a protocol version %d > 2\n",
1007                                 pkt[0] & 0xff);
1008
1009         if (CDP_compute_csum(pkt, len) != 0)
1010                 return;
1011
1012         pkt += 4;
1013         len -= 4;
1014
1015         vlan = htons(-1);
1016         nvlan = htons(-1);
1017         while (len > 0) {
1018                 if (len < 4)
1019                         goto pkt_short;
1020
1021                 ss = (const ushort *)pkt;
1022                 type = ntohs(ss[0]);
1023                 tlen = ntohs(ss[1]);
1024                 if (tlen > len) {
1025                         goto pkt_short;
1026                 }
1027
1028                 pkt += tlen;
1029                 len -= tlen;
1030
1031                 ss += 2;        /* point ss to the data of the TLV */
1032                 tlen -= 4;
1033
1034                 switch (type) {
1035                         case CDP_DEVICE_ID_TLV:
1036                                 break;
1037                         case CDP_ADDRESS_TLV:
1038                                 break;
1039                         case CDP_PORT_ID_TLV:
1040                                 break;
1041                         case CDP_CAPABILITIES_TLV:
1042                                 break;
1043                         case CDP_VERSION_TLV:
1044                                 break;
1045                         case CDP_PLATFORM_TLV:
1046                                 break;
1047                         case CDP_NATIVE_VLAN_TLV:
1048                                 nvlan = *ss;
1049                                 break;
1050                         case CDP_APPLIANCE_VLAN_TLV:
1051                                 t = (const uchar *)ss;
1052                                 while (tlen > 0) {
1053                                         if (tlen < 3)
1054                                                 goto pkt_short;
1055
1056                                         applid = t[0];
1057                                         ss = (const ushort *)(t + 1);
1058
1059 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE
1060                                         if (applid == CONFIG_CDP_APPLIANCE_VLAN_TYPE)
1061                                                 vlan = *ss;
1062 #else
1063                                         vlan = ntohs(*ss);      /* XXX will this work; dunno */
1064 #endif
1065                                         t += 3; tlen -= 3;
1066                                 }
1067                                 break;
1068                         case CDP_TRIGGER_TLV:
1069                                 break;
1070                         case CDP_POWER_CONSUMPTION_TLV:
1071                                 break;
1072                         case CDP_SYSNAME_TLV:
1073                                 break;
1074                         case CDP_SYSOBJECT_TLV:
1075                                 break;
1076                         case CDP_MANAGEMENT_ADDRESS_TLV:
1077                                 break;
1078                 }
1079         }
1080
1081         CDPApplianceVLAN = vlan;
1082         CDPNativeVLAN = nvlan;
1083
1084         CDPOK = 1;
1085         return;
1086
1087  pkt_short:
1088         printf("** CDP packet is too short\n");
1089         return;
1090 }
1091
1092 static void CDPStart(void)
1093 {
1094 #if defined(CONFIG_NET_MULTI)
1095         printf ("Using %s device\n", eth_get_name());
1096 #endif
1097         CDPSeq = 0;
1098         CDPOK = 0;
1099
1100         CDPNativeVLAN = htons(-1);
1101         CDPApplianceVLAN = htons(-1);
1102
1103         NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
1104         NetSetHandler (CDPDummyHandler);
1105
1106         CDPSendTrigger();
1107 }
1108 #endif
1109
1110 #ifdef CONFIG_IP_DEFRAG
1111 /*
1112  * This function collects fragments in a single packet, according
1113  * to the algorithm in RFC815. It returns NULL or the pointer to
1114  * a complete packet, in static storage
1115  */
1116 #ifndef CONFIG_NET_MAXDEFRAG
1117 #define CONFIG_NET_MAXDEFRAG 16384
1118 #endif
1119 /*
1120  * MAXDEFRAG, above, is chosen in the config file and  is real data
1121  * so we need to add the NFS overhead, which is more than TFTP.
1122  * To use sizeof in the internal unnamed structures, we need a real
1123  * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately).
1124  * The compiler doesn't complain nor allocates the actual structure
1125  */
1126 static struct rpc_t rpc_specimen;
1127 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply))
1128
1129 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE_NO_UDP)
1130
1131 /*
1132  * this is the packet being assembled, either data or frag control.
1133  * Fragments go by 8 bytes, so this union must be 8 bytes long
1134  */
1135 struct hole {
1136         /* first_byte is address of this structure */
1137         u16 last_byte;  /* last byte in this hole + 1 (begin of next hole) */
1138         u16 next_hole;  /* index of next (in 8-b blocks), 0 == none */
1139         u16 prev_hole;  /* index of prev, 0 == none */
1140         u16 unused;
1141 };
1142
1143 static IP_t *__NetDefragment(IP_t *ip, int *lenp)
1144 {
1145         static uchar pkt_buff[IP_PKTSIZE] __attribute__((aligned(PKTALIGN)));
1146         static u16 first_hole, total_len;
1147         struct hole *payload, *thisfrag, *h, *newh;
1148         IP_t *localip = (IP_t *)pkt_buff;
1149         uchar *indata = (uchar *)ip;
1150         int offset8, start, len, done = 0;
1151         u16 ip_off = ntohs(ip->ip_off);
1152
1153         /* payload starts after IP header, this fragment is in there */
1154         payload = (struct hole *)(pkt_buff + IP_HDR_SIZE_NO_UDP);
1155         offset8 =  (ip_off & IP_OFFS);
1156         thisfrag = payload + offset8;
1157         start = offset8 * 8;
1158         len = ntohs(ip->ip_len) - IP_HDR_SIZE_NO_UDP;
1159
1160         if (start + len > IP_MAXUDP) /* fragment extends too far */
1161                 return NULL;
1162
1163         if (!total_len || localip->ip_id != ip->ip_id) {
1164                 /* new (or different) packet, reset structs */
1165                 total_len = 0xffff;
1166                 payload[0].last_byte = ~0;
1167                 payload[0].next_hole = 0;
1168                 payload[0].prev_hole = 0;
1169                 first_hole = 0;
1170                 /* any IP header will work, copy the first we received */
1171                 memcpy(localip, ip, IP_HDR_SIZE_NO_UDP);
1172         }
1173
1174         /*
1175          * What follows is the reassembly algorithm. We use the payload
1176          * array as a linked list of hole descriptors, as each hole starts
1177          * at a multiple of 8 bytes. However, last byte can be whatever value,
1178          * so it is represented as byte count, not as 8-byte blocks.
1179          */
1180
1181         h = payload + first_hole;
1182         while (h->last_byte < start) {
1183                 if (!h->next_hole) {
1184                         /* no hole that far away */
1185                         return NULL;
1186                 }
1187                 h = payload + h->next_hole;
1188         }
1189
1190         if (offset8 + (len / 8) <= h - payload) {
1191                 /* no overlap with holes (dup fragment?) */
1192                 return NULL;
1193         }
1194
1195         if (!(ip_off & IP_FLAGS_MFRAG)) {
1196                 /* no more fragmentss: truncate this (last) hole */
1197                 total_len = start + len;
1198                 h->last_byte = start + len;
1199         }
1200
1201         /*
1202          * There is some overlap: fix the hole list. This code doesn't
1203          * deal with a fragment that overlaps with two different holes
1204          * (thus being a superset of a previously-received fragment).
1205          */
1206
1207         if ( (h >= thisfrag) && (h->last_byte <= start + len) ) {
1208                 /* complete overlap with hole: remove hole */
1209                 if (!h->prev_hole && !h->next_hole) {
1210                         /* last remaining hole */
1211                         done = 1;
1212                 } else if (!h->prev_hole) {
1213                         /* first hole */
1214                         first_hole = h->next_hole;
1215                         payload[h->next_hole].prev_hole = 0;
1216                 } else if (!h->next_hole) {
1217                         /* last hole */
1218                         payload[h->prev_hole].next_hole = 0;
1219                 } else {
1220                         /* in the middle of the list */
1221                         payload[h->next_hole].prev_hole = h->prev_hole;
1222                         payload[h->prev_hole].next_hole = h->next_hole;
1223                 }
1224
1225         } else if (h->last_byte <= start + len) {
1226                 /* overlaps with final part of the hole: shorten this hole */
1227                 h->last_byte = start;
1228
1229         } else if (h >= thisfrag) {
1230                 /* overlaps with initial part of the hole: move this hole */
1231                 newh = thisfrag + (len / 8);
1232                 *newh = *h;
1233                 h = newh;
1234                 if (h->next_hole)
1235                         payload[h->next_hole].prev_hole = (h - payload);
1236                 if (h->prev_hole)
1237                         payload[h->prev_hole].next_hole = (h - payload);
1238                 else
1239                         first_hole = (h - payload);
1240
1241         } else {
1242                 /* fragment sits in the middle: split the hole */
1243                 newh = thisfrag + (len / 8);
1244                 *newh = *h;
1245                 h->last_byte = start;
1246                 h->next_hole = (newh - payload);
1247                 newh->prev_hole = (h - payload);
1248                 if (newh->next_hole)
1249                         payload[newh->next_hole].prev_hole = (newh - payload);
1250         }
1251
1252         /* finally copy this fragment and possibly return whole packet */
1253         memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE_NO_UDP, len);
1254         if (!done)
1255                 return NULL;
1256
1257         localip->ip_len = htons(total_len);
1258         *lenp = total_len + IP_HDR_SIZE_NO_UDP;
1259         return localip;
1260 }
1261
1262 static inline IP_t *NetDefragment(IP_t *ip, int *lenp)
1263 {
1264         u16 ip_off = ntohs(ip->ip_off);
1265         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1266                 return ip; /* not a fragment */
1267         return __NetDefragment(ip, lenp);
1268 }
1269
1270 #else /* !CONFIG_IP_DEFRAG */
1271
1272 static inline IP_t *NetDefragment(IP_t *ip, int *lenp)
1273 {
1274         u16 ip_off = ntohs(ip->ip_off);
1275         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1276                 return ip; /* not a fragment */
1277         return NULL;
1278 }
1279 #endif
1280
1281 void
1282 NetReceive(volatile uchar * inpkt, int len)
1283 {
1284         Ethernet_t *et;
1285         IP_t    *ip;
1286         ARP_t   *arp;
1287         IPaddr_t tmp;
1288         int     x;
1289         uchar *pkt;
1290 #if defined(CONFIG_CMD_CDP)
1291         int iscdp;
1292 #endif
1293         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1294
1295         debug("packet received\n");
1296
1297         NetRxPacket = inpkt;
1298         NetRxPacketLen = len;
1299         et = (Ethernet_t *)inpkt;
1300
1301         /* too small packet? */
1302         if (len < ETHER_HDR_SIZE)
1303                 return;
1304
1305 #ifdef CONFIG_API
1306         if (push_packet) {
1307                 (*push_packet)(inpkt, len);
1308                 return;
1309         }
1310 #endif
1311
1312 #if defined(CONFIG_CMD_CDP)
1313         /* keep track if packet is CDP */
1314         iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0;
1315 #endif
1316
1317         myvlanid = ntohs(NetOurVLAN);
1318         if (myvlanid == (ushort)-1)
1319                 myvlanid = VLAN_NONE;
1320         mynvlanid = ntohs(NetOurNativeVLAN);
1321         if (mynvlanid == (ushort)-1)
1322                 mynvlanid = VLAN_NONE;
1323
1324         x = ntohs(et->et_protlen);
1325
1326         debug("packet received\n");
1327
1328         if (x < 1514) {
1329                 /*
1330                  *      Got a 802 packet.  Check the other protocol field.
1331                  */
1332                 x = ntohs(et->et_prot);
1333
1334                 ip = (IP_t *)(inpkt + E802_HDR_SIZE);
1335                 len -= E802_HDR_SIZE;
1336
1337         } else if (x != PROT_VLAN) {    /* normal packet */
1338                 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE);
1339                 len -= ETHER_HDR_SIZE;
1340
1341         } else {                        /* VLAN packet */
1342                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et;
1343
1344                 debug("VLAN packet received\n");
1345
1346                 /* too small packet? */
1347                 if (len < VLAN_ETHER_HDR_SIZE)
1348                         return;
1349
1350                 /* if no VLAN active */
1351                 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
1352 #if defined(CONFIG_CMD_CDP)
1353                                 && iscdp == 0
1354 #endif
1355                                 )
1356                         return;
1357
1358                 cti = ntohs(vet->vet_tag);
1359                 vlanid = cti & VLAN_IDMASK;
1360                 x = ntohs(vet->vet_type);
1361
1362                 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE);
1363                 len -= VLAN_ETHER_HDR_SIZE;
1364         }
1365
1366         debug("Receive from protocol 0x%x\n", x);
1367
1368 #if defined(CONFIG_CMD_CDP)
1369         if (iscdp) {
1370                 CDPHandler((uchar *)ip, len);
1371                 return;
1372         }
1373 #endif
1374
1375         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1376                 if (vlanid == VLAN_NONE)
1377                         vlanid = (mynvlanid & VLAN_IDMASK);
1378                 /* not matched? */
1379                 if (vlanid != (myvlanid & VLAN_IDMASK))
1380                         return;
1381         }
1382
1383         switch (x) {
1384
1385         case PROT_ARP:
1386                 /*
1387                  * We have to deal with two types of ARP packets:
1388                  * - REQUEST packets will be answered by sending  our
1389                  *   IP address - if we know it.
1390                  * - REPLY packates are expected only after we asked
1391                  *   for the TFTP server's or the gateway's ethernet
1392                  *   address; so if we receive such a packet, we set
1393                  *   the server ethernet address
1394                  */
1395                 debug("Got ARP\n");
1396
1397                 arp = (ARP_t *)ip;
1398                 if (len < ARP_HDR_SIZE) {
1399                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1400                         return;
1401                 }
1402                 if (ntohs(arp->ar_hrd) != ARP_ETHER) {
1403                         return;
1404                 }
1405                 if (ntohs(arp->ar_pro) != PROT_IP) {
1406                         return;
1407                 }
1408                 if (arp->ar_hln != 6) {
1409                         return;
1410                 }
1411                 if (arp->ar_pln != 4) {
1412                         return;
1413                 }
1414
1415                 if (NetOurIP == 0) {
1416                         return;
1417                 }
1418
1419                 if (NetReadIP(&arp->ar_data[16]) != NetOurIP) {
1420                         return;
1421                 }
1422
1423                 switch (ntohs(arp->ar_op)) {
1424                 case ARPOP_REQUEST:             /* reply with our IP address    */
1425                         debug("Got ARP REQUEST, return our IP\n");
1426                         pkt = (uchar *)et;
1427                         pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
1428                         arp->ar_op = htons(ARPOP_REPLY);
1429                         memcpy   (&arp->ar_data[10], &arp->ar_data[0], 6);
1430                         NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
1431                         memcpy   (&arp->ar_data[ 0], NetOurEther, 6);
1432                         NetCopyIP(&arp->ar_data[ 6], &NetOurIP);
1433                         (void) eth_send((uchar *)et, (pkt - (uchar *)et) + ARP_HDR_SIZE);
1434                         return;
1435
1436                 case ARPOP_REPLY:               /* arp reply */
1437                         /* are we waiting for a reply */
1438                         if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
1439                                 break;
1440
1441 #ifdef CONFIG_KEEP_SERVERADDR
1442                         if (NetServerIP == NetArpWaitPacketIP) {
1443                                 char buf[20];
1444                                 sprintf(buf, "%pM", arp->ar_data);
1445                                 setenv("serveraddr", buf);
1446                         }
1447 #endif
1448
1449                         debug("Got ARP REPLY, set server/gtwy eth addr (%pM)\n",
1450                                 arp->ar_data);
1451
1452                         tmp = NetReadIP(&arp->ar_data[6]);
1453
1454                         /* matched waiting packet's address */
1455                         if (tmp == NetArpWaitReplyIP) {
1456                                 debug("Got it\n");
1457                                 /* save address for later use */
1458                                 memcpy(NetArpWaitPacketMAC, &arp->ar_data[0], 6);
1459
1460 #ifdef CONFIG_NETCONSOLE
1461                                 (*packetHandler)(0,0,0,0);
1462 #endif
1463                                 /* modify header, and transmit it */
1464                                 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6);
1465                                 (void) eth_send(NetArpWaitTxPacket, NetArpWaitTxPacketSize);
1466
1467                                 /* no arp request pending now */
1468                                 NetArpWaitPacketIP = 0;
1469                                 NetArpWaitTxPacketSize = 0;
1470                                 NetArpWaitPacketMAC = NULL;
1471
1472                         }
1473                         return;
1474                 default:
1475                         debug("Unexpected ARP opcode 0x%x\n", ntohs(arp->ar_op));
1476                         return;
1477                 }
1478                 break;
1479
1480         case PROT_RARP:
1481                 debug("Got RARP\n");
1482                 arp = (ARP_t *)ip;
1483                 if (len < ARP_HDR_SIZE) {
1484                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1485                         return;
1486                 }
1487
1488                 if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
1489                         (ntohs(arp->ar_hrd) != ARP_ETHER)   ||
1490                         (ntohs(arp->ar_pro) != PROT_IP)     ||
1491                         (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
1492
1493                         puts ("invalid RARP header\n");
1494                 } else {
1495                         NetCopyIP(&NetOurIP,    &arp->ar_data[16]);
1496                         if (NetServerIP == 0)
1497                                 NetCopyIP(&NetServerIP, &arp->ar_data[ 6]);
1498                         memcpy (NetServerEther, &arp->ar_data[ 0], 6);
1499
1500                         (*packetHandler)(0,0,0,0);
1501                 }
1502                 break;
1503
1504         case PROT_IP:
1505                 debug("Got IP\n");
1506                 /* Before we start poking the header, make sure it is there */
1507                 if (len < IP_HDR_SIZE) {
1508                         debug("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE);
1509                         return;
1510                 }
1511                 /* Check the packet length */
1512                 if (len < ntohs(ip->ip_len)) {
1513                         printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
1514                         return;
1515                 }
1516                 len = ntohs(ip->ip_len);
1517                 debug("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
1518
1519                 /* Can't deal with anything except IPv4 */
1520                 if ((ip->ip_hl_v & 0xf0) != 0x40) {
1521                         return;
1522                 }
1523                 /* Can't deal with IP options (headers != 20 bytes) */
1524                 if ((ip->ip_hl_v & 0x0f) > 0x05) {
1525                         return;
1526                 }
1527                 /* Check the Checksum of the header */
1528                 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
1529                         puts ("checksum bad\n");
1530                         return;
1531                 }
1532                 /* If it is not for us, ignore it */
1533                 tmp = NetReadIP(&ip->ip_dst);
1534                 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
1535 #ifdef CONFIG_MCAST_TFTP
1536                         if (Mcast_addr != tmp)
1537 #endif
1538                         return;
1539                 }
1540                 /*
1541                  * The function returns the unchanged packet if it's not
1542                  * a fragment, and either the complete packet or NULL if
1543                  * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1544                  */
1545                 if (!(ip = NetDefragment(ip, &len)))
1546                         return;
1547                 /*
1548                  * watch for ICMP host redirects
1549                  *
1550                  * There is no real handler code (yet). We just watch
1551                  * for ICMP host redirect messages. In case anybody
1552                  * sees these messages: please contact me
1553                  * (wd@denx.de), or - even better - send me the
1554                  * necessary fixes :-)
1555                  *
1556                  * Note: in all cases where I have seen this so far
1557                  * it was a problem with the router configuration,
1558                  * for instance when a router was configured in the
1559                  * BOOTP reply, but the TFTP server was on the same
1560                  * subnet. So this is probably a warning that your
1561                  * configuration might be wrong. But I'm not really
1562                  * sure if there aren't any other situations.
1563                  */
1564                 if (ip->ip_p == IPPROTO_ICMP) {
1565                         ICMP_t *icmph = (ICMP_t *)&(ip->udp_src);
1566
1567                         switch (icmph->type) {
1568                         case ICMP_REDIRECT:
1569                                 if (icmph->code != ICMP_REDIR_HOST)
1570                                         return;
1571                                 printf (" ICMP Host Redirect to %pI4 ", &icmph->un.gateway);
1572                                 return;
1573 #if defined(CONFIG_CMD_PING)
1574                         case ICMP_ECHO_REPLY:
1575                                 /*
1576                                  *      IP header OK.  Pass the packet to the current handler.
1577                                  */
1578                                 /* XXX point to ip packet */
1579                                 (*packetHandler)((uchar *)ip, 0, 0, 0);
1580                                 return;
1581                         case ICMP_ECHO_REQUEST:
1582                                 debug("Got ICMP ECHO REQUEST, return %d bytes \n",
1583                                         ETHER_HDR_SIZE + len);
1584
1585                                 memcpy (&et->et_dest[0], &et->et_src[0], 6);
1586                                 memcpy (&et->et_src[ 0], NetOurEther, 6);
1587
1588                                 ip->ip_sum = 0;
1589                                 ip->ip_off = 0;
1590                                 NetCopyIP((void*)&ip->ip_dst, &ip->ip_src);
1591                                 NetCopyIP((void*)&ip->ip_src, &NetOurIP);
1592                                 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP >> 1);
1593
1594                                 icmph->type = ICMP_ECHO_REPLY;
1595                                 icmph->checksum = 0;
1596                                 icmph->checksum = ~NetCksum((uchar *)icmph,
1597                                                 (len - IP_HDR_SIZE_NO_UDP) >> 1);
1598                                 (void) eth_send((uchar *)et, ETHER_HDR_SIZE + len);
1599                                 return;
1600 #endif
1601                         default:
1602                                 return;
1603                         }
1604                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1605                         return;
1606                 }
1607
1608 #ifdef CONFIG_UDP_CHECKSUM
1609                 if (ip->udp_xsum != 0) {
1610                         ulong   xsum;
1611                         ushort *sumptr;
1612                         ushort  sumlen;
1613
1614                         xsum  = ip->ip_p;
1615                         xsum += (ntohs(ip->udp_len));
1616                         xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
1617                         xsum += (ntohl(ip->ip_src) >>  0) & 0x0000ffff;
1618                         xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
1619                         xsum += (ntohl(ip->ip_dst) >>  0) & 0x0000ffff;
1620
1621                         sumlen = ntohs(ip->udp_len);
1622                         sumptr = (ushort *) &(ip->udp_src);
1623
1624                         while (sumlen > 1) {
1625                                 ushort sumdata;
1626
1627                                 sumdata = *sumptr++;
1628                                 xsum += ntohs(sumdata);
1629                                 sumlen -= 2;
1630                         }
1631                         if (sumlen > 0) {
1632                                 ushort sumdata;
1633
1634                                 sumdata = *(unsigned char *) sumptr;
1635                                 sumdata = (sumdata << 8) & 0xff00;
1636                                 xsum += sumdata;
1637                         }
1638                         while ((xsum >> 16) != 0) {
1639                                 xsum = (xsum & 0x0000ffff) + ((xsum >> 16) & 0x0000ffff);
1640                         }
1641                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1642                                 printf(" UDP wrong checksum %08lx %08x\n",
1643                                         xsum, ntohs(ip->udp_xsum));
1644                                 return;
1645                         }
1646                 }
1647 #endif
1648
1649
1650 #ifdef CONFIG_NETCONSOLE
1651                 nc_input_packet((uchar *)ip +IP_HDR_SIZE,
1652                                                 ntohs(ip->udp_dst),
1653                                                 ntohs(ip->udp_src),
1654                                                 ntohs(ip->udp_len) - 8);
1655 #endif
1656                 /*
1657                  *      IP header OK.  Pass the packet to the current handler.
1658                  */
1659                 (*packetHandler)((uchar *)ip +IP_HDR_SIZE,
1660                                                 ntohs(ip->udp_dst),
1661                                                 ntohs(ip->udp_src),
1662                                                 ntohs(ip->udp_len) - 8);
1663                 break;
1664         }
1665 }
1666
1667
1668 /**********************************************************************/
1669
1670 static int net_check_prereq (proto_t protocol)
1671 {
1672         switch (protocol) {
1673                 /* Fall through */
1674 #if defined(CONFIG_CMD_PING)
1675         case PING:
1676                 if (NetPingIP == 0) {
1677                         puts ("*** ERROR: ping address not given\n");
1678                         return (1);
1679                 }
1680                 goto common;
1681 #endif
1682 #if defined(CONFIG_CMD_SNTP)
1683         case SNTP:
1684                 if (NetNtpServerIP == 0) {
1685                         puts ("*** ERROR: NTP server address not given\n");
1686                         return (1);
1687                 }
1688                 goto common;
1689 #endif
1690 #if defined(CONFIG_CMD_DNS)
1691         case DNS:
1692                 if (NetOurDNSIP == 0) {
1693                         puts("*** ERROR: DNS server address not given\n");
1694                         return 1;
1695                 }
1696                 goto common;
1697 #endif
1698 #if defined(CONFIG_CMD_NFS)
1699         case NFS:
1700 #endif
1701         case NETCONS:
1702         case TFTP:
1703                 if (NetServerIP == 0) {
1704                         puts ("*** ERROR: `serverip' not set\n");
1705                         return (1);
1706                 }
1707 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP)
1708     common:
1709 #endif
1710
1711                 if (NetOurIP == 0) {
1712                         puts ("*** ERROR: `ipaddr' not set\n");
1713                         return (1);
1714                 }
1715                 /* Fall through */
1716
1717         case DHCP:
1718         case RARP:
1719         case BOOTP:
1720         case CDP:
1721                 if (memcmp (NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
1722 #ifdef CONFIG_NET_MULTI
1723                         extern int eth_get_dev_index (void);
1724                         int num = eth_get_dev_index ();
1725
1726                         switch (num) {
1727                         case -1:
1728                                 puts ("*** ERROR: No ethernet found.\n");
1729                                 return (1);
1730                         case 0:
1731                                 puts ("*** ERROR: `ethaddr' not set\n");
1732                                 break;
1733                         default:
1734                                 printf ("*** ERROR: `eth%daddr' not set\n",
1735                                         num);
1736                                 break;
1737                         }
1738
1739                         NetStartAgain ();
1740                         return (2);
1741 #else
1742                         puts ("*** ERROR: `ethaddr' not set\n");
1743                         return (1);
1744 #endif
1745                 }
1746                 /* Fall through */
1747         default:
1748                 return (0);
1749         }
1750         return (0);             /* OK */
1751 }
1752 /**********************************************************************/
1753
1754 int
1755 NetCksumOk(uchar * ptr, int len)
1756 {
1757         return !((NetCksum(ptr, len) + 1) & 0xfffe);
1758 }
1759
1760
1761 unsigned
1762 NetCksum(uchar * ptr, int len)
1763 {
1764         ulong   xsum;
1765         ushort *p = (ushort *)ptr;
1766
1767         xsum = 0;
1768         while (len-- > 0)
1769                 xsum += *p++;
1770         xsum = (xsum & 0xffff) + (xsum >> 16);
1771         xsum = (xsum & 0xffff) + (xsum >> 16);
1772         return (xsum & 0xffff);
1773 }
1774
1775 int
1776 NetEthHdrSize(void)
1777 {
1778         ushort myvlanid;
1779
1780         myvlanid = ntohs(NetOurVLAN);
1781         if (myvlanid == (ushort)-1)
1782                 myvlanid = VLAN_NONE;
1783
1784         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : VLAN_ETHER_HDR_SIZE;
1785 }
1786
1787 int
1788 NetSetEther(volatile uchar * xet, uchar * addr, uint prot)
1789 {
1790         Ethernet_t *et = (Ethernet_t *)xet;
1791         ushort myvlanid;
1792
1793         myvlanid = ntohs(NetOurVLAN);
1794         if (myvlanid == (ushort)-1)
1795                 myvlanid = VLAN_NONE;
1796
1797         memcpy (et->et_dest, addr, 6);
1798         memcpy (et->et_src, NetOurEther, 6);
1799         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1800         et->et_protlen = htons(prot);
1801                 return ETHER_HDR_SIZE;
1802         } else {
1803                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet;
1804
1805                 vet->vet_vlan_type = htons(PROT_VLAN);
1806                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1807                 vet->vet_type = htons(prot);
1808                 return VLAN_ETHER_HDR_SIZE;
1809         }
1810 }
1811
1812 void
1813 NetSetIP(volatile uchar * xip, IPaddr_t dest, int dport, int sport, int len)
1814 {
1815         IP_t *ip = (IP_t *)xip;
1816
1817         /*
1818          *      If the data is an odd number of bytes, zero the
1819          *      byte after the last byte so that the checksum
1820          *      will work.
1821          */
1822         if (len & 1)
1823                 xip[IP_HDR_SIZE + len] = 0;
1824
1825         /*
1826          *      Construct an IP and UDP header.
1827          *      (need to set no fragment bit - XXX)
1828          */
1829         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
1830         ip->ip_tos   = 0;
1831         ip->ip_len   = htons(IP_HDR_SIZE + len);
1832         ip->ip_id    = htons(NetIPID++);
1833         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1834         ip->ip_ttl   = 255;
1835         ip->ip_p     = 17;              /* UDP */
1836         ip->ip_sum   = 0;
1837         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
1838         NetCopyIP((void*)&ip->ip_dst, &dest);      /* - "" - */
1839         ip->udp_src  = htons(sport);
1840         ip->udp_dst  = htons(dport);
1841         ip->udp_len  = htons(8 + len);
1842         ip->udp_xsum = 0;
1843         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
1844 }
1845
1846 void copy_filename (char *dst, char *src, int size)
1847 {
1848         if (*src && (*src == '"')) {
1849                 ++src;
1850                 --size;
1851         }
1852
1853         while ((--size > 0) && *src && (*src != '"')) {
1854                 *dst++ = *src++;
1855         }
1856         *dst = '\0';
1857 }
1858
1859 #endif
1860
1861 #if defined(CONFIG_CMD_NFS) || defined(CONFIG_CMD_SNTP) || defined(CONFIG_CMD_DNS)
1862 /*
1863  * make port a little random, but use something trivial to compute
1864  */
1865 unsigned int random_port(void)
1866 {
1867         return 1024 + (get_timer(0) % 0x8000);;
1868 }
1869 #endif
1870
1871 void ip_to_string (IPaddr_t x, char *s)
1872 {
1873         x = ntohl (x);
1874         sprintf (s, "%d.%d.%d.%d",
1875                  (int) ((x >> 24) & 0xff),
1876                  (int) ((x >> 16) & 0xff),
1877                  (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
1878         );
1879 }
1880
1881 IPaddr_t string_to_ip(char *s)
1882 {
1883         IPaddr_t addr;
1884         char *e;
1885         int i;
1886
1887         if (s == NULL)
1888                 return(0);
1889
1890         for (addr=0, i=0; i<4; ++i) {
1891                 ulong val = s ? simple_strtoul(s, &e, 10) : 0;
1892                 addr <<= 8;
1893                 addr |= (val & 0xFF);
1894                 if (s) {
1895                         s = (*e) ? e+1 : e;
1896                 }
1897         }
1898
1899         return (htonl(addr));
1900 }
1901
1902 void VLAN_to_string(ushort x, char *s)
1903 {
1904         x = ntohs(x);
1905
1906         if (x == (ushort)-1)
1907                 x = VLAN_NONE;
1908
1909         if (x == VLAN_NONE)
1910                 strcpy(s, "none");
1911         else
1912                 sprintf(s, "%d", x & VLAN_IDMASK);
1913 }
1914
1915 ushort string_to_VLAN(char *s)
1916 {
1917         ushort id;
1918
1919         if (s == NULL)
1920                 return htons(VLAN_NONE);
1921
1922         if (*s < '0' || *s > '9')
1923                 id = VLAN_NONE;
1924         else
1925                 id = (ushort)simple_strtoul(s, NULL, 10);
1926
1927         return htons(id);
1928 }
1929
1930 IPaddr_t getenv_IPaddr (char *var)
1931 {
1932         return (string_to_ip(getenv(var)));
1933 }
1934
1935 ushort getenv_VLAN(char *var)
1936 {
1937         return (string_to_VLAN(getenv(var)));
1938 }