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 #ifdef CONFIG_CMD_RARP
  84 #include "rarp.h"
  85 #endif
  86 #include "nfs.h"
  87 #ifdef CONFIG_STATUS_LED
  88 #include <status_led.h>
  89 #include <miiphy.h>
  90 #endif
  91 #if defined(CONFIG_CMD_SNTP)
  92 #include "sntp.h"
  93 #endif
  94 #if defined(CONFIG_CDP_VERSION)
  95 #include <timestamp.h>
  96 #endif
  97 #if defined(CONFIG_CMD_DNS)
  98 #include "dns.h"
  99 #endif
 100
 101 DECLARE_GLOBAL_DATA_PTR;
 102
 103 #ifndef CONFIG_ARP_TIMEOUT
 104 /* Milliseconds before trying ARP again */
 105 # define ARP_TIMEOUT            5000UL
 106 #else
 107 # define ARP_TIMEOUT            CONFIG_ARP_TIMEOUT
 108 #endif
 109
 110
 111 #ifndef CONFIG_NET_RETRY_COUNT
 112 # define ARP_TIMEOUT_COUNT      5       /* # of timeouts before giving up  */
 113 #else
 114 # define ARP_TIMEOUT_COUNT      CONFIG_NET_RETRY_COUNT
 115 #endif
 116
 117 /** BOOTP EXTENTIONS **/
 118
 119 /* Our subnet mask (0=unknown) */
 120 IPaddr_t        NetOurSubnetMask=0;
 121 /* Our gateways IP address */
 122 IPaddr_t        NetOurGatewayIP=0;
 123 /* Our DNS IP address */
 124 IPaddr_t        NetOurDNSIP=0;
 125 #if defined(CONFIG_BOOTP_DNS2)
 126 /* Our 2nd DNS IP address */
 127 IPaddr_t        NetOurDNS2IP=0;
 128 #endif
 129 /* Our NIS domain */
 130 char            NetOurNISDomain[32]={0,};
 131 /* Our hostname */
 132 char            NetOurHostName[32]={0,};
 133 /* Our bootpath */
 134 char            NetOurRootPath[64]={0,};
 135 /* Our bootfile size in blocks */
 136 ushort          NetBootFileSize=0;
 137
 138 #ifdef CONFIG_MCAST_TFTP        /* Multicast TFTP */
 139 IPaddr_t Mcast_addr;
 140 #endif
 141
 142 /** END OF BOOTP EXTENTIONS **/
 143
 144 /* The actual transferred size of the bootfile (in bytes) */
 145 ulong           NetBootFileXferSize;
 146 /* Our ethernet address */
 147 uchar           NetOurEther[6];
 148 /* Boot server enet address */
 149 uchar           NetServerEther[6] =
 150                         { 0, 0, 0, 0, 0, 0 };
 151 /* Our IP addr (0 = unknown) */
 152 IPaddr_t        NetOurIP;
 153 /* Server IP addr (0 = unknown) */
 154 IPaddr_t        NetServerIP;
 155 /* Current receive packet */
 156 volatile uchar *NetRxPacket;
 157 /* Current rx packet length */
 158 int             NetRxPacketLen;
 159 /* IP packet ID */
 160 unsigned        NetIPID;
 161 /* Ethernet bcast address */
 162 uchar           NetBcastAddr[6] =
 163                         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 164 uchar           NetEtherNullAddr[6] =
 165                         { 0, 0, 0, 0, 0, 0 };
 166 #ifdef CONFIG_API
 167 void            (*push_packet)(volatile void *, int len) = 0;
 168 #endif
 169 #if defined(CONFIG_CMD_CDP)
 170 /* Ethernet bcast address */
 171 uchar           NetCDPAddr[6] =
 172                         { 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc };
 173 #endif
 174 /* Network loop state */
 175 int             NetState;
 176 #ifdef CONFIG_NET_MULTI
 177 /* Tried all network devices */
 178 int             NetRestartWrap = 0;
 179 /* Network loop restarted */
 180 static int      NetRestarted = 0;
 181 /* At least one device configured */
 182 static int      NetDevExists = 0;
 183 #endif
 184
 185 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
 186 /* default is without VLAN */
 187 ushort          NetOurVLAN = 0xFFFF;
 188 /* ditto */
 189 ushort          NetOurNativeVLAN = 0xFFFF;
 190
 191 /* Boot File name */
 192 char            BootFile[128];
 193
 194 #if defined(CONFIG_CMD_PING)
 195 /* the ip address to ping */
 196 IPaddr_t        NetPingIP;
 197
 198 static void PingStart(void);
 199 #endif
 200
 201 #if defined(CONFIG_CMD_CDP)
 202 static void CDPStart(void);
 203 #endif
 204
 205 #if defined(CONFIG_CMD_SNTP)
 206 /* NTP server IP address */
 207 IPaddr_t        NetNtpServerIP;
 208 /* offset time from UTC */
 209 int             NetTimeOffset=0;
 210 #endif
 211
 212 #ifdef CONFIG_NETCONSOLE
 213 void NcStart(void);
 214 int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len);
 215 #endif
 216
 217 volatile uchar  PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 218
 219 /* Receive packet */
 220 volatile uchar *NetRxPackets[PKTBUFSRX];
 221
 222 /* Current RX packet handler */
 223 static rxhand_f *packetHandler;
 224 /* Current timeout handler */
 225 static thand_f *timeHandler;
 226 /* Time base value */
 227 static ulong    timeStart;
 228 /* Current timeout value */
 229 static ulong    timeDelta;
 230 /* THE transmit packet */
 231 volatile uchar *NetTxPacket = 0;
 232
 233 static int net_check_prereq (proto_t protocol);
 234
 235 static int NetTryCount;
 236
 237 /**********************************************************************/
 238
 239 IPaddr_t        NetArpWaitPacketIP;
 240 IPaddr_t        NetArpWaitReplyIP;
 241 /* MAC address of waiting packet's destination */
 242 uchar          *NetArpWaitPacketMAC;
 243 /* THE transmit packet */
 244 uchar          *NetArpWaitTxPacket;
 245 int             NetArpWaitTxPacketSize;
 246 uchar           NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
 247 ulong           NetArpWaitTimerStart;
 248 int             NetArpWaitTry;
 249
 250 void ArpRequest (void)
 251 {
 252         int i;
 253         volatile uchar *pkt;
 254         ARP_t *arp;
 255
 256         debug("ARP broadcast %d\n", NetArpWaitTry);
 257
 258         pkt = NetTxPacket;
 259
 260         pkt += NetSetEther (pkt, NetBcastAddr, PROT_ARP);
 261
 262         arp = (ARP_t *) pkt;
 263
 264         arp->ar_hrd = htons (ARP_ETHER);
 265         arp->ar_pro = htons (PROT_IP);
 266         arp->ar_hln = 6;
 267         arp->ar_pln = 4;
 268         arp->ar_op = htons (ARPOP_REQUEST);
 269
 270         /* source ET addr */
 271         memcpy (&arp->ar_data[0], NetOurEther, 6);
 272         /* source IP addr */
 273         NetWriteIP ((uchar *) & arp->ar_data[6], NetOurIP);
 274         for (i = 10; i < 16; ++i) {
 275                 /* dest ET addr = 0 */
 276                 arp->ar_data[i] = 0;
 277         }
 278
 279         if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
 280             (NetOurIP & NetOurSubnetMask)) {
 281                 if (NetOurGatewayIP == 0) {
 282                         puts ("## Warning: gatewayip needed but not set\n");
 283                         NetArpWaitReplyIP = NetArpWaitPacketIP;
 284                 } else {
 285                         NetArpWaitReplyIP = NetOurGatewayIP;
 286                 }
 287         } else {
 288                 NetArpWaitReplyIP = NetArpWaitPacketIP;
 289         }
 290
 291         NetWriteIP ((uchar *) & arp->ar_data[16], NetArpWaitReplyIP);
 292         (void) eth_send (NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
 293 }
 294
 295 void ArpTimeoutCheck(void)
 296 {
 297         ulong t;
 298
 299         if (!NetArpWaitPacketIP)
 300                 return;
 301
 302         t = get_timer(0);
 303
 304         /* check for arp timeout */
 305         if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT) {
 306                 NetArpWaitTry++;
 307
 308                 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
 309                         puts ("\nARP Retry count exceeded; starting again\n");
 310                         NetArpWaitTry = 0;
 311                         NetStartAgain();
 312                 } else {
 313                         NetArpWaitTimerStart = t;
 314                         ArpRequest();
 315                 }
 316         }
 317 }
 318
 319 static void
 320 NetInitLoop(proto_t protocol)
 321 {
 322         static int env_changed_id = 0;
 323         bd_t *bd = gd->bd;
 324         int env_id = get_env_id ();
 325
 326         /* update only when the environment has changed */
 327         if (env_changed_id != env_id) {
 328                 NetCopyIP(&NetOurIP, &bd->bi_ip_addr);
 329                 NetOurGatewayIP = getenv_IPaddr ("gatewayip");
 330                 NetOurSubnetMask= getenv_IPaddr ("netmask");
 331                 NetServerIP = getenv_IPaddr ("serverip");
 332                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 333                 NetOurVLAN = getenv_VLAN("vlan");
 334 #if defined(CONFIG_CMD_DNS)
 335                 NetOurDNSIP = getenv_IPaddr("dnsip");
 336 #endif
 337                 env_changed_id = env_id;
 338         }
 339
 340         return;
 341 }
 342
 343 /**********************************************************************/
 344 /*
 345  *      Main network processing loop.
 346  */
 347
 348 int
 349 NetLoop(proto_t protocol)
 350 {
 351         bd_t *bd = gd->bd;
 352
 353 #ifdef CONFIG_NET_MULTI
 354         NetRestarted = 0;
 355         NetDevExists = 0;
 356 #endif
 357
 358         /* XXX problem with bss workaround */
 359         NetArpWaitPacketMAC = NULL;
 360         NetArpWaitTxPacket = NULL;
 361         NetArpWaitPacketIP = 0;
 362         NetArpWaitReplyIP = 0;
 363         NetArpWaitTxPacket = NULL;
 364         NetTxPacket = NULL;
 365         NetTryCount = 1;
 366
 367         if (!NetTxPacket) {
 368                 int     i;
 369                 /*
 370                  *      Setup packet buffers, aligned correctly.
 371                  */
 372                 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
 373                 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
 374                 for (i = 0; i < PKTBUFSRX; i++) {
 375                         NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
 376                 }
 377         }
 378
 379         if (!NetArpWaitTxPacket) {
 380                 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
 381                 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
 382                 NetArpWaitTxPacketSize = 0;
 383         }
 384
 385         eth_halt();
 386 #ifdef CONFIG_NET_MULTI
 387         eth_set_current();
 388 #endif
 389         if (eth_init(bd) < 0) {
 390                 eth_halt();
 391                 return(-1);
 392         }
 393
 394 restart:
 395 #ifdef CONFIG_NET_MULTI
 396         memcpy (NetOurEther, eth_get_dev()->enetaddr, 6);
 397 #else
 398         eth_getenv_enetaddr("ethaddr", NetOurEther);
 399 #endif
 400
 401         NetState = NETLOOP_CONTINUE;
 402
 403         /*
 404          *      Start the ball rolling with the given start function.  From
 405          *      here on, this code is a state machine driven by received
 406          *      packets and timer events.
 407          */
 408         NetInitLoop(protocol);
 409
 410         switch (net_check_prereq (protocol)) {
 411         case 1:
 412                 /* network not configured */
 413                 eth_halt();
 414                 return (-1);
 415
 416 #ifdef CONFIG_NET_MULTI
 417         case 2:
 418                 /* network device not configured */
 419                 break;
 420 #endif /* CONFIG_NET_MULTI */
 421
 422         case 0:
 423 #ifdef CONFIG_NET_MULTI
 424                 NetDevExists = 1;
 425 #endif
 426                 switch (protocol) {
 427                 case TFTP:
 428                         /* always use ARP to get server ethernet address */
 429                         TftpStart();
 430                         break;
 431
 432 #if defined(CONFIG_CMD_DHCP)
 433                 case DHCP:
 434                         BootpTry = 0;
 435                         NetOurIP = 0;
 436                         DhcpRequest();          /* Basically same as BOOTP */
 437                         break;
 438 #endif
 439
 440                 case BOOTP:
 441                         BootpTry = 0;
 442                         NetOurIP = 0;
 443                         BootpRequest ();
 444                         break;
 445
 446 #if defined(CONFIG_CMD_RARP)
 447                 case RARP:
 448                         RarpTry = 0;
 449                         NetOurIP = 0;
 450                         RarpRequest ();
 451                         break;
 452 #endif
 453 #if defined(CONFIG_CMD_PING)
 454                 case PING:
 455                         PingStart();
 456                         break;
 457 #endif
 458 #if defined(CONFIG_CMD_NFS)
 459                 case NFS:
 460                         NfsStart();
 461                         break;
 462 #endif
 463 #if defined(CONFIG_CMD_CDP)
 464                 case CDP:
 465                         CDPStart();
 466                         break;
 467 #endif
 468 #ifdef CONFIG_NETCONSOLE
 469                 case NETCONS:
 470                         NcStart();
 471                         break;
 472 #endif
 473 #if defined(CONFIG_CMD_SNTP)
 474                 case SNTP:
 475                         SntpStart();
 476                         break;
 477 #endif
 478 #if defined(CONFIG_CMD_DNS)
 479                 case DNS:
 480                         DnsStart();
 481                         break;
 482 #endif
 483                 default:
 484                         break;
 485                 }
 486
 487                 NetBootFileXferSize = 0;
 488                 break;
 489         }
 490
 491 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 492 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 493         defined(CONFIG_STATUS_LED)                      && \
 494         defined(STATUS_LED_RED)
 495         /*
 496          * Echo the inverted link state to the fault LED.
 497          */
 498         if(miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) {
 499                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 500         } else {
 501                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 502         }
 503 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 504 #endif /* CONFIG_MII, ... */
 505
 506         /*
 507          *      Main packet reception loop.  Loop receiving packets until
 508          *      someone sets `NetState' to a state that terminates.
 509          */
 510         for (;;) {
 511                 WATCHDOG_RESET();
 512 #ifdef CONFIG_SHOW_ACTIVITY
 513                 {
 514                         extern void show_activity(int arg);
 515                         show_activity(1);
 516                 }
 517 #endif
 518                 /*
 519                  *      Check the ethernet for a new packet.  The ethernet
 520                  *      receive routine will process it.
 521                  */
 522                 eth_rx();
 523
 524                 /*
 525                  *      Abort if ctrl-c was pressed.
 526                  */
 527                 if (ctrlc()) {
 528                         eth_halt();
 529                         puts ("\nAbort\n");
 530                         return (-1);
 531                 }
 532
 533                 ArpTimeoutCheck();
 534
 535                 /*
 536                  *      Check for a timeout, and run the timeout handler
 537                  *      if we have one.
 538                  */
 539                 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
 540                         thand_f *x;
 541
 542 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 543 #  if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \
 544       defined(CONFIG_STATUS_LED) &&        \
 545       defined(STATUS_LED_RED)
 546                         /*
 547                          * Echo the inverted link state to the fault LED.
 548                          */
 549                         if(miiphy_link(eth_get_dev()->name,
 550                                        CONFIG_SYS_FAULT_MII_ADDR)) {
 551                                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 552                         } else {
 553                                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 554                         }
 555 #  endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 556 #endif /* CONFIG_MII, ... */
 557                         x = timeHandler;
 558                         timeHandler = (thand_f *)0;
 559                         (*x)();
 560                 }
 561
 562
 563                 switch (NetState) {
 564
 565                 case NETLOOP_RESTART:
 566 #ifdef CONFIG_NET_MULTI
 567                         NetRestarted = 1;
 568 #endif
 569                         goto restart;
 570
 571                 case NETLOOP_SUCCESS:
 572                         if (NetBootFileXferSize > 0) {
 573                                 char buf[20];
 574                                 printf("Bytes transferred = %ld (%lx hex)\n",
 575                                         NetBootFileXferSize,
 576                                         NetBootFileXferSize);
 577                                 sprintf(buf, "%lX", NetBootFileXferSize);
 578                                 setenv("filesize", buf);
 579
 580                                 sprintf(buf, "%lX", (unsigned long)load_addr);
 581                                 setenv("fileaddr", buf);
 582                         }
 583                         eth_halt();
 584                         return NetBootFileXferSize;
 585
 586                 case NETLOOP_FAIL:
 587                         return (-1);
 588                 }
 589         }
 590 }
 591
 592 /**********************************************************************/
 593
 594 static void
 595 startAgainTimeout(void)
 596 {
 597         NetState = NETLOOP_RESTART;
 598 }
 599
 600 static void
 601 startAgainHandler(uchar *pkt, unsigned dest, IPaddr_t sip,
 602                   unsigned src, unsigned len)
 603 {
 604         /* Totally ignore the packet */
 605 }
 606
 607 void NetStartAgain (void)
 608 {
 609         char *nretry;
 610         int retry_forever = 0;
 611         unsigned long retrycnt = 0;
 612
 613         nretry = getenv("netretry");
 614         if (nretry) {
 615                 if (!strcmp(nretry, "yes"))
 616                         retry_forever = 1;
 617                 else if (!strcmp(nretry, "no"))
 618                         retrycnt = 0;
 619                 else if (!strcmp(nretry, "once"))
 620                         retrycnt = 1;
 621                 else
 622                         retrycnt = simple_strtoul(nretry, NULL, 0);
 623         } else
 624                 retry_forever = 1;
 625
 626         if ((!retry_forever) && (NetTryCount >= retrycnt)) {
 627                 eth_halt();
 628                 NetState = NETLOOP_FAIL;
 629                 return;
 630         }
 631
 632         NetTryCount++;
 633
 634 #ifndef CONFIG_NET_MULTI
 635         NetSetTimeout (10000UL, startAgainTimeout);
 636         NetSetHandler (startAgainHandler);
 637 #else   /* !CONFIG_NET_MULTI*/
 638         eth_halt ();
 639 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
 640         eth_try_another (!NetRestarted);
 641 #endif
 642         eth_init (gd->bd);
 643         if (NetRestartWrap) {
 644                 NetRestartWrap = 0;
 645                 if (NetDevExists) {
 646                         NetSetTimeout (10000UL, startAgainTimeout);
 647                         NetSetHandler (startAgainHandler);
 648                 } else {
 649                         NetState = NETLOOP_FAIL;
 650                 }
 651         } else {
 652                 NetState = NETLOOP_RESTART;
 653         }
 654 #endif  /* CONFIG_NET_MULTI */
 655 }
 656
 657 /**********************************************************************/
 658 /*
 659  *      Miscelaneous bits.
 660  */
 661
 662 void
 663 NetSetHandler(rxhand_f * f)
 664 {
 665         packetHandler = f;
 666 }
 667
 668
 669 void
 670 NetSetTimeout(ulong iv, thand_f * f)
 671 {
 672         if (iv == 0) {
 673                 timeHandler = (thand_f *)0;
 674         } else {
 675                 timeHandler = f;
 676                 timeStart = get_timer(0);
 677                 timeDelta = iv;
 678         }
 679 }
 680
 681
 682 void
 683 NetSendPacket(volatile uchar * pkt, int len)
 684 {
 685         (void) eth_send(pkt, len);
 686 }
 687
 688 int
 689 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
 690 {
 691         uchar *pkt;
 692
 693         /* convert to new style broadcast */
 694         if (dest == 0)
 695                 dest = 0xFFFFFFFF;
 696
 697         /* if broadcast, make the ether address a broadcast and don't do ARP */
 698         if (dest == 0xFFFFFFFF)
 699                 ether = NetBcastAddr;
 700
 701         /*
 702          * if MAC address was not discovered yet, save the packet and do
 703          * an ARP request
 704          */
 705         if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
 706
 707                 debug("sending ARP for %08lx\n", dest);
 708
 709                 NetArpWaitPacketIP = dest;
 710                 NetArpWaitPacketMAC = ether;
 711
 712                 pkt = NetArpWaitTxPacket;
 713                 pkt += NetSetEther (pkt, NetArpWaitPacketMAC, PROT_IP);
 714
 715                 NetSetIP (pkt, dest, dport, sport, len);
 716                 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket +
 717                        (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len);
 718
 719                 /* size of the waiting packet */
 720                 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) +
 721                         IP_HDR_SIZE + len;
 722
 723                 /* and do the ARP request */
 724                 NetArpWaitTry = 1;
 725                 NetArpWaitTimerStart = get_timer(0);
 726                 ArpRequest();
 727                 return 1;       /* waiting */
 728         }
 729
 730         debug("sending UDP to %08lx/%pM\n", dest, ether);
 731
 732         pkt = (uchar *)NetTxPacket;
 733         pkt += NetSetEther (pkt, ether, PROT_IP);
 734         NetSetIP (pkt, dest, dport, sport, len);
 735         (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len);
 736
 737         return 0;       /* transmitted */
 738 }
 739
 740 #if defined(CONFIG_CMD_PING)
 741 static ushort PingSeqNo;
 742
 743 int PingSend(void)
 744 {
 745         static uchar mac[6];
 746         volatile IP_t *ip;
 747         volatile ushort *s;
 748         uchar *pkt;
 749
 750         /* XXX always send arp request */
 751
 752         memcpy(mac, NetEtherNullAddr, 6);
 753
 754         debug("sending ARP for %08lx\n", NetPingIP);
 755
 756         NetArpWaitPacketIP = NetPingIP;
 757         NetArpWaitPacketMAC = mac;
 758
 759         pkt = NetArpWaitTxPacket;
 760         pkt += NetSetEther(pkt, mac, PROT_IP);
 761
 762         ip = (volatile IP_t *)pkt;
 763
 764         /*
 765          * Construct an IP and ICMP header.
 766          * (need to set no fragment bit - XXX)
 767          */
 768         /* IP_HDR_SIZE / 4 (not including UDP) */
 769         ip->ip_hl_v  = 0x45;
 770         ip->ip_tos   = 0;
 771         ip->ip_len   = htons(IP_HDR_SIZE_NO_UDP + 8);
 772         ip->ip_id    = htons(NetIPID++);
 773         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
 774         ip->ip_ttl   = 255;
 775         ip->ip_p     = 0x01;            /* ICMP */
 776         ip->ip_sum   = 0;
 777         /* already in network byte order */
 778         NetCopyIP((void*)&ip->ip_src, &NetOurIP);
 779         /* - "" - */
 780         NetCopyIP((void*)&ip->ip_dst, &NetPingIP);
 781         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
 782
 783         s = &ip->udp_src;               /* XXX ICMP starts here */
 784         s[0] = htons(0x0800);           /* echo-request, code */
 785         s[1] = 0;                       /* checksum */
 786         s[2] = 0;                       /* identifier */
 787         s[3] = htons(PingSeqNo++);      /* sequence number */
 788         s[1] = ~NetCksum((uchar *)s, 8/2);
 789
 790         /* size of the waiting packet */
 791         NetArpWaitTxPacketSize =
 792                 (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8;
 793
 794         /* and do the ARP request */
 795         NetArpWaitTry = 1;
 796         NetArpWaitTimerStart = get_timer(0);
 797         ArpRequest();
 798         return 1;       /* waiting */
 799 }
 800
 801 static void
 802 PingTimeout (void)
 803 {
 804         eth_halt();
 805         NetState = NETLOOP_FAIL;        /* we did not get the reply */
 806 }
 807
 808 static void
 809 PingHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
 810             unsigned len)
 811 {
 812         if (sip != NetPingIP)
 813                 return;
 814
 815         NetState = NETLOOP_SUCCESS;
 816 }
 817
 818 static void PingStart(void)
 819 {
 820 #if defined(CONFIG_NET_MULTI)
 821         printf ("Using %s device\n", eth_get_name());
 822 #endif  /* CONFIG_NET_MULTI */
 823         NetSetTimeout (10000UL, PingTimeout);
 824         NetSetHandler (PingHandler);
 825
 826         PingSend();
 827 }
 828 #endif
 829
 830 #if defined(CONFIG_CMD_CDP)
 831
 832 #define CDP_DEVICE_ID_TLV               0x0001
 833 #define CDP_ADDRESS_TLV                 0x0002
 834 #define CDP_PORT_ID_TLV                 0x0003
 835 #define CDP_CAPABILITIES_TLV            0x0004
 836 #define CDP_VERSION_TLV                 0x0005
 837 #define CDP_PLATFORM_TLV                0x0006
 838 #define CDP_NATIVE_VLAN_TLV             0x000a
 839 #define CDP_APPLIANCE_VLAN_TLV          0x000e
 840 #define CDP_TRIGGER_TLV                 0x000f
 841 #define CDP_POWER_CONSUMPTION_TLV       0x0010
 842 #define CDP_SYSNAME_TLV                 0x0014
 843 #define CDP_SYSOBJECT_TLV               0x0015
 844 #define CDP_MANAGEMENT_ADDRESS_TLV      0x0016
 845
 846 #define CDP_TIMEOUT                     250UL   /* one packet every 250ms */
 847
 848 static int CDPSeq;
 849 static int CDPOK;
 850
 851 ushort CDPNativeVLAN;
 852 ushort CDPApplianceVLAN;
 853
 854 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20,
 855                                        0x00 };
 856
 857 static ushort CDP_compute_csum(const uchar *buff, ushort len)
 858 {
 859         ushort csum;
 860         int     odd;
 861         ulong   result = 0;
 862         ushort  leftover;
 863         ushort *p;
 864
 865         if (len > 0) {
 866                 odd = 1 & (ulong)buff;
 867                 if (odd) {
 868                         result = *buff << 8;
 869                         len--;
 870                         buff++;
 871                 }
 872                 while (len > 1) {
 873                         p = (ushort *)buff;
 874                         result += *p++;
 875                         buff = (uchar *)p;
 876                         if (result & 0x80000000)
 877                                 result = (result & 0xFFFF) + (result >> 16);
 878                         len -= 2;
 879                 }
 880                 if (len) {
 881                         leftover = (signed short)(*(const signed char *)buff);
 882                         /* CISCO SUCKS big time! (and blows too):
 883                          * CDP uses the IP checksum algorithm with a twist;
 884                          * for the last byte it *sign* extends and sums.
 885                          */
 886                         result = (result & 0xffff0000) |
 887                                  ((result + leftover) & 0x0000ffff);
 888                 }
 889                 while (result >> 16)
 890                         result = (result & 0xFFFF) + (result >> 16);
 891
 892                 if (odd)
 893                         result = ((result >> 8) & 0xff) |
 894                                  ((result & 0xff) << 8);
 895         }
 896
 897         /* add up 16-bit and 17-bit words for 17+c bits */
 898         result = (result & 0xffff) + (result >> 16);
 899         /* add up 16-bit and 2-bit for 16+c bit */
 900         result = (result & 0xffff) + (result >> 16);
 901         /* add up carry.. */
 902         result = (result & 0xffff) + (result >> 16);
 903
 904         /* negate */
 905         csum = ~(ushort)result;
 906
 907         /* run time endian detection */
 908         if (csum != htons(csum))        /* little endian */
 909                 csum = htons(csum);
 910
 911         return csum;
 912 }
 913
 914 int CDPSendTrigger(void)
 915 {
 916         volatile uchar *pkt;
 917         volatile ushort *s;
 918         volatile ushort *cp;
 919         Ethernet_t *et;
 920         int len;
 921         ushort chksum;
 922 #if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID)   || \
 923     defined(CONFIG_CDP_VERSION)   || defined(CONFIG_CDP_PLATFORM)
 924         char buf[32];
 925 #endif
 926
 927         pkt = NetTxPacket;
 928         et = (Ethernet_t *)pkt;
 929
 930         /* NOTE: trigger sent not on any VLAN */
 931
 932         /* form ethernet header */
 933         memcpy(et->et_dest, NetCDPAddr, 6);
 934         memcpy(et->et_src, NetOurEther, 6);
 935
 936         pkt += ETHER_HDR_SIZE;
 937
 938         /* SNAP header */
 939         memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr));
 940         pkt += sizeof(CDP_SNAP_hdr);
 941
 942         /* CDP header */
 943         *pkt++ = 0x02;                          /* CDP version 2 */
 944         *pkt++ = 180;                           /* TTL */
 945         s = (volatile ushort *)pkt;
 946         cp = s;
 947         /* checksum (0 for later calculation) */
 948         *s++ = htons(0);
 949
 950         /* CDP fields */
 951 #ifdef CONFIG_CDP_DEVICE_ID
 952         *s++ = htons(CDP_DEVICE_ID_TLV);
 953         *s++ = htons(CONFIG_CDP_DEVICE_ID);
 954         sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%pm", NetOurEther);
 955         memcpy((uchar *)s, buf, 16);
 956         s += 16 / 2;
 957 #endif
 958
 959 #ifdef CONFIG_CDP_PORT_ID
 960         *s++ = htons(CDP_PORT_ID_TLV);
 961         memset(buf, 0, sizeof(buf));
 962         sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index());
 963         len = strlen(buf);
 964         if (len & 1)    /* make it even */
 965                 len++;
 966         *s++ = htons(len + 4);
 967         memcpy((uchar *)s, buf, len);
 968         s += len / 2;
 969 #endif
 970
 971 #ifdef CONFIG_CDP_CAPABILITIES
 972         *s++ = htons(CDP_CAPABILITIES_TLV);
 973         *s++ = htons(8);
 974         *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES);
 975         s += 2;
 976 #endif
 977
 978 #ifdef CONFIG_CDP_VERSION
 979         *s++ = htons(CDP_VERSION_TLV);
 980         memset(buf, 0, sizeof(buf));
 981         strcpy(buf, CONFIG_CDP_VERSION);
 982         len = strlen(buf);
 983         if (len & 1)    /* make it even */
 984                 len++;
 985         *s++ = htons(len + 4);
 986         memcpy((uchar *)s, buf, len);
 987         s += len / 2;
 988 #endif
 989
 990 #ifdef CONFIG_CDP_PLATFORM
 991         *s++ = htons(CDP_PLATFORM_TLV);
 992         memset(buf, 0, sizeof(buf));
 993         strcpy(buf, CONFIG_CDP_PLATFORM);
 994         len = strlen(buf);
 995         if (len & 1)    /* make it even */
 996                 len++;
 997         *s++ = htons(len + 4);
 998         memcpy((uchar *)s, buf, len);
 999         s += len / 2;
1000 #endif
1001
1002 #ifdef CONFIG_CDP_TRIGGER
1003         *s++ = htons(CDP_TRIGGER_TLV);
1004         *s++ = htons(8);
1005         *(ulong *)s = htonl(CONFIG_CDP_TRIGGER);
1006         s += 2;
1007 #endif
1008
1009 #ifdef CONFIG_CDP_POWER_CONSUMPTION
1010         *s++ = htons(CDP_POWER_CONSUMPTION_TLV);
1011         *s++ = htons(6);
1012         *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION);
1013 #endif
1014
1015         /* length of ethernet packet */
1016         len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE);
1017         et->et_protlen = htons(len);
1018
1019         len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr);
1020         chksum = CDP_compute_csum((uchar *)NetTxPacket + len,
1021                                   (uchar *)s - (NetTxPacket + len));
1022         if (chksum == 0)
1023                 chksum = 0xFFFF;
1024         *cp = htons(chksum);
1025
1026         (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket);
1027         return 0;
1028 }
1029
1030 static void
1031 CDPTimeout (void)
1032 {
1033         CDPSeq++;
1034
1035         if (CDPSeq < 3) {
1036                 NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
1037                 CDPSendTrigger();
1038                 return;
1039         }
1040
1041         /* if not OK try again */
1042         if (!CDPOK)
1043                 NetStartAgain();
1044         else
1045                 NetState = NETLOOP_SUCCESS;
1046 }
1047
1048 static void
1049 CDPDummyHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
1050                 unsigned len)
1051 {
1052         /* nothing */
1053 }
1054
1055 static void
1056 CDPHandler(const uchar * pkt, unsigned len)
1057 {
1058         const uchar *t;
1059         const ushort *ss;
1060         ushort type, tlen;
1061         uchar applid;
1062         ushort vlan, nvlan;
1063
1064         /* minimum size? */
1065         if (len < sizeof(CDP_SNAP_hdr) + 4)
1066                 goto pkt_short;
1067
1068         /* check for valid CDP SNAP header */
1069         if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0)
1070                 return;
1071
1072         pkt += sizeof(CDP_SNAP_hdr);
1073         len -= sizeof(CDP_SNAP_hdr);
1074
1075         /* Version of CDP protocol must be >= 2 and TTL != 0 */
1076         if (pkt[0] < 0x02 || pkt[1] == 0)
1077                 return;
1078
1079         /*
1080          * if version is greater than 0x02 maybe we'll have a problem;
1081          * output a warning
1082          */
1083         if (pkt[0] != 0x02)
1084                 printf("** WARNING: CDP packet received with a protocol version %d > 2\n",
1085                                 pkt[0] & 0xff);
1086
1087         if (CDP_compute_csum(pkt, len) != 0)
1088                 return;
1089
1090         pkt += 4;
1091         len -= 4;
1092
1093         vlan = htons(-1);
1094         nvlan = htons(-1);
1095         while (len > 0) {
1096                 if (len < 4)
1097                         goto pkt_short;
1098
1099                 ss = (const ushort *)pkt;
1100                 type = ntohs(ss[0]);
1101                 tlen = ntohs(ss[1]);
1102                 if (tlen > len) {
1103                         goto pkt_short;
1104                 }
1105
1106                 pkt += tlen;
1107                 len -= tlen;
1108
1109                 ss += 2;        /* point ss to the data of the TLV */
1110                 tlen -= 4;
1111
1112                 switch (type) {
1113                         case CDP_DEVICE_ID_TLV:
1114                                 break;
1115                         case CDP_ADDRESS_TLV:
1116                                 break;
1117                         case CDP_PORT_ID_TLV:
1118                                 break;
1119                         case CDP_CAPABILITIES_TLV:
1120                                 break;
1121                         case CDP_VERSION_TLV:
1122                                 break;
1123                         case CDP_PLATFORM_TLV:
1124                                 break;
1125                         case CDP_NATIVE_VLAN_TLV:
1126                                 nvlan = *ss;
1127                                 break;
1128                         case CDP_APPLIANCE_VLAN_TLV:
1129                                 t = (const uchar *)ss;
1130                                 while (tlen > 0) {
1131                                         if (tlen < 3)
1132                                                 goto pkt_short;
1133
1134                                         applid = t[0];
1135                                         ss = (const ushort *)(t + 1);
1136
1137 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE
1138                                         if (applid ==
1139                                             CONFIG_CDP_APPLIANCE_VLAN_TYPE)
1140                                                 vlan = *ss;
1141 #else
1142                                         /* XXX will this work; dunno */
1143                                         vlan = ntohs(*ss);
1144 #endif
1145                                         t += 3; tlen -= 3;
1146                                 }
1147                                 break;
1148                         case CDP_TRIGGER_TLV:
1149                                 break;
1150                         case CDP_POWER_CONSUMPTION_TLV:
1151                                 break;
1152                         case CDP_SYSNAME_TLV:
1153                                 break;
1154                         case CDP_SYSOBJECT_TLV:
1155                                 break;
1156                         case CDP_MANAGEMENT_ADDRESS_TLV:
1157                                 break;
1158                 }
1159         }
1160
1161         CDPApplianceVLAN = vlan;
1162         CDPNativeVLAN = nvlan;
1163
1164         CDPOK = 1;
1165         return;
1166
1167  pkt_short:
1168         printf("** CDP packet is too short\n");
1169         return;
1170 }
1171
1172 static void CDPStart(void)
1173 {
1174 #if defined(CONFIG_NET_MULTI)
1175         printf ("Using %s device\n", eth_get_name());
1176 #endif
1177         CDPSeq = 0;
1178         CDPOK = 0;
1179
1180         CDPNativeVLAN = htons(-1);
1181         CDPApplianceVLAN = htons(-1);
1182
1183         NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
1184         NetSetHandler (CDPDummyHandler);
1185
1186         CDPSendTrigger();
1187 }
1188 #endif
1189
1190 #ifdef CONFIG_IP_DEFRAG
1191 /*
1192  * This function collects fragments in a single packet, according
1193  * to the algorithm in RFC815. It returns NULL or the pointer to
1194  * a complete packet, in static storage
1195  */
1196 #ifndef CONFIG_NET_MAXDEFRAG
1197 #define CONFIG_NET_MAXDEFRAG 16384
1198 #endif
1199 /*
1200  * MAXDEFRAG, above, is chosen in the config file and  is real data
1201  * so we need to add the NFS overhead, which is more than TFTP.
1202  * To use sizeof in the internal unnamed structures, we need a real
1203  * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately).
1204  * The compiler doesn't complain nor allocates the actual structure
1205  */
1206 static struct rpc_t rpc_specimen;
1207 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply))
1208
1209 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE_NO_UDP)
1210
1211 /*
1212  * this is the packet being assembled, either data or frag control.
1213  * Fragments go by 8 bytes, so this union must be 8 bytes long
1214  */
1215 struct hole {
1216         /* first_byte is address of this structure */
1217         u16 last_byte;  /* last byte in this hole + 1 (begin of next hole) */
1218         u16 next_hole;  /* index of next (in 8-b blocks), 0 == none */
1219         u16 prev_hole;  /* index of prev, 0 == none */
1220         u16 unused;
1221 };
1222
1223 static IP_t *__NetDefragment(IP_t *ip, int *lenp)
1224 {
1225         static uchar pkt_buff[IP_PKTSIZE] __attribute__((aligned(PKTALIGN)));
1226         static u16 first_hole, total_len;
1227         struct hole *payload, *thisfrag, *h, *newh;
1228         IP_t *localip = (IP_t *)pkt_buff;
1229         uchar *indata = (uchar *)ip;
1230         int offset8, start, len, done = 0;
1231         u16 ip_off = ntohs(ip->ip_off);
1232
1233         /* payload starts after IP header, this fragment is in there */
1234         payload = (struct hole *)(pkt_buff + IP_HDR_SIZE_NO_UDP);
1235         offset8 =  (ip_off & IP_OFFS);
1236         thisfrag = payload + offset8;
1237         start = offset8 * 8;
1238         len = ntohs(ip->ip_len) - IP_HDR_SIZE_NO_UDP;
1239
1240         if (start + len > IP_MAXUDP) /* fragment extends too far */
1241                 return NULL;
1242
1243         if (!total_len || localip->ip_id != ip->ip_id) {
1244                 /* new (or different) packet, reset structs */
1245                 total_len = 0xffff;
1246                 payload[0].last_byte = ~0;
1247                 payload[0].next_hole = 0;
1248                 payload[0].prev_hole = 0;
1249                 first_hole = 0;
1250                 /* any IP header will work, copy the first we received */
1251                 memcpy(localip, ip, IP_HDR_SIZE_NO_UDP);
1252         }
1253
1254         /*
1255          * What follows is the reassembly algorithm. We use the payload
1256          * array as a linked list of hole descriptors, as each hole starts
1257          * at a multiple of 8 bytes. However, last byte can be whatever value,
1258          * so it is represented as byte count, not as 8-byte blocks.
1259          */
1260
1261         h = payload + first_hole;
1262         while (h->last_byte < start) {
1263                 if (!h->next_hole) {
1264                         /* no hole that far away */
1265                         return NULL;
1266                 }
1267                 h = payload + h->next_hole;
1268         }
1269
1270         /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
1271         if (offset8 + ((len + 7) / 8) <= h - payload) {
1272                 /* no overlap with holes (dup fragment?) */
1273                 return NULL;
1274         }
1275
1276         if (!(ip_off & IP_FLAGS_MFRAG)) {
1277                 /* no more fragmentss: truncate this (last) hole */
1278                 total_len = start + len;
1279                 h->last_byte = start + len;
1280         }
1281
1282         /*
1283          * There is some overlap: fix the hole list. This code doesn't
1284          * deal with a fragment that overlaps with two different holes
1285          * (thus being a superset of a previously-received fragment).
1286          */
1287
1288         if ( (h >= thisfrag) && (h->last_byte <= start + len) ) {
1289                 /* complete overlap with hole: remove hole */
1290                 if (!h->prev_hole && !h->next_hole) {
1291                         /* last remaining hole */
1292                         done = 1;
1293                 } else if (!h->prev_hole) {
1294                         /* first hole */
1295                         first_hole = h->next_hole;
1296                         payload[h->next_hole].prev_hole = 0;
1297                 } else if (!h->next_hole) {
1298                         /* last hole */
1299                         payload[h->prev_hole].next_hole = 0;
1300                 } else {
1301                         /* in the middle of the list */
1302                         payload[h->next_hole].prev_hole = h->prev_hole;
1303                         payload[h->prev_hole].next_hole = h->next_hole;
1304                 }
1305
1306         } else if (h->last_byte <= start + len) {
1307                 /* overlaps with final part of the hole: shorten this hole */
1308                 h->last_byte = start;
1309
1310         } else if (h >= thisfrag) {
1311                 /* overlaps with initial part of the hole: move this hole */
1312                 newh = thisfrag + (len / 8);
1313                 *newh = *h;
1314                 h = newh;
1315                 if (h->next_hole)
1316                         payload[h->next_hole].prev_hole = (h - payload);
1317                 if (h->prev_hole)
1318                         payload[h->prev_hole].next_hole = (h - payload);
1319                 else
1320                         first_hole = (h - payload);
1321
1322         } else {
1323                 /* fragment sits in the middle: split the hole */
1324                 newh = thisfrag + (len / 8);
1325                 *newh = *h;
1326                 h->last_byte = start;
1327                 h->next_hole = (newh - payload);
1328                 newh->prev_hole = (h - payload);
1329                 if (newh->next_hole)
1330                         payload[newh->next_hole].prev_hole = (newh - payload);
1331         }
1332
1333         /* finally copy this fragment and possibly return whole packet */
1334         memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE_NO_UDP, len);
1335         if (!done)
1336                 return NULL;
1337
1338         localip->ip_len = htons(total_len);
1339         *lenp = total_len + IP_HDR_SIZE_NO_UDP;
1340         return localip;
1341 }
1342
1343 static inline IP_t *NetDefragment(IP_t *ip, int *lenp)
1344 {
1345         u16 ip_off = ntohs(ip->ip_off);
1346         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1347                 return ip; /* not a fragment */
1348         return __NetDefragment(ip, lenp);
1349 }
1350
1351 #else /* !CONFIG_IP_DEFRAG */
1352
1353 static inline IP_t *NetDefragment(IP_t *ip, int *lenp)
1354 {
1355         u16 ip_off = ntohs(ip->ip_off);
1356         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1357                 return ip; /* not a fragment */
1358         return NULL;
1359 }
1360 #endif
1361
1362 void
1363 NetReceive(volatile uchar * inpkt, int len)
1364 {
1365         Ethernet_t *et;
1366         IP_t    *ip;
1367         ARP_t   *arp;
1368         IPaddr_t tmp;
1369         IPaddr_t src_ip;
1370         int     x;
1371         uchar *pkt;
1372 #if defined(CONFIG_CMD_CDP)
1373         int iscdp;
1374 #endif
1375         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1376
1377         debug("packet received\n");
1378
1379         NetRxPacket = inpkt;
1380         NetRxPacketLen = len;
1381         et = (Ethernet_t *)inpkt;
1382
1383         /* too small packet? */
1384         if (len < ETHER_HDR_SIZE)
1385                 return;
1386
1387 #ifdef CONFIG_API
1388         if (push_packet) {
1389                 (*push_packet)(inpkt, len);
1390                 return;
1391         }
1392 #endif
1393
1394 #if defined(CONFIG_CMD_CDP)
1395         /* keep track if packet is CDP */
1396         iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0;
1397 #endif
1398
1399         myvlanid = ntohs(NetOurVLAN);
1400         if (myvlanid == (ushort)-1)
1401                 myvlanid = VLAN_NONE;
1402         mynvlanid = ntohs(NetOurNativeVLAN);
1403         if (mynvlanid == (ushort)-1)
1404                 mynvlanid = VLAN_NONE;
1405
1406         x = ntohs(et->et_protlen);
1407
1408         debug("packet received\n");
1409
1410         if (x < 1514) {
1411                 /*
1412                  *      Got a 802 packet.  Check the other protocol field.
1413                  */
1414                 x = ntohs(et->et_prot);
1415
1416                 ip = (IP_t *)(inpkt + E802_HDR_SIZE);
1417                 len -= E802_HDR_SIZE;
1418
1419         } else if (x != PROT_VLAN) {    /* normal packet */
1420                 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE);
1421                 len -= ETHER_HDR_SIZE;
1422
1423         } else {                        /* VLAN packet */
1424                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et;
1425
1426                 debug("VLAN packet received\n");
1427
1428                 /* too small packet? */
1429                 if (len < VLAN_ETHER_HDR_SIZE)
1430                         return;
1431
1432                 /* if no VLAN active */
1433                 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
1434 #if defined(CONFIG_CMD_CDP)
1435                                 && iscdp == 0
1436 #endif
1437                                 )
1438                         return;
1439
1440                 cti = ntohs(vet->vet_tag);
1441                 vlanid = cti & VLAN_IDMASK;
1442                 x = ntohs(vet->vet_type);
1443
1444                 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE);
1445                 len -= VLAN_ETHER_HDR_SIZE;
1446         }
1447
1448         debug("Receive from protocol 0x%x\n", x);
1449
1450 #if defined(CONFIG_CMD_CDP)
1451         if (iscdp) {
1452                 CDPHandler((uchar *)ip, len);
1453                 return;
1454         }
1455 #endif
1456
1457         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1458                 if (vlanid == VLAN_NONE)
1459                         vlanid = (mynvlanid & VLAN_IDMASK);
1460                 /* not matched? */
1461                 if (vlanid != (myvlanid & VLAN_IDMASK))
1462                         return;
1463         }
1464
1465         switch (x) {
1466
1467         case PROT_ARP:
1468                 /*
1469                  * We have to deal with two types of ARP packets:
1470                  * - REQUEST packets will be answered by sending  our
1471                  *   IP address - if we know it.
1472                  * - REPLY packates are expected only after we asked
1473                  *   for the TFTP server's or the gateway's ethernet
1474                  *   address; so if we receive such a packet, we set
1475                  *   the server ethernet address
1476                  */
1477                 debug("Got ARP\n");
1478
1479                 arp = (ARP_t *)ip;
1480                 if (len < ARP_HDR_SIZE) {
1481                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1482                         return;
1483                 }
1484                 if (ntohs(arp->ar_hrd) != ARP_ETHER) {
1485                         return;
1486                 }
1487                 if (ntohs(arp->ar_pro) != PROT_IP) {
1488                         return;
1489                 }
1490                 if (arp->ar_hln != 6) {
1491                         return;
1492                 }
1493                 if (arp->ar_pln != 4) {
1494                         return;
1495                 }
1496
1497                 if (NetOurIP == 0) {
1498                         return;
1499                 }
1500
1501                 if (NetReadIP(&arp->ar_data[16]) != NetOurIP) {
1502                         return;
1503                 }
1504
1505                 switch (ntohs(arp->ar_op)) {
1506                 case ARPOP_REQUEST:
1507                         /* reply with our IP address */
1508                         debug("Got ARP REQUEST, return our IP\n");
1509                         pkt = (uchar *)et;
1510                         pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
1511                         arp->ar_op = htons(ARPOP_REPLY);
1512                         memcpy   (&arp->ar_data[10], &arp->ar_data[0], 6);
1513                         NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
1514                         memcpy   (&arp->ar_data[ 0], NetOurEther, 6);
1515                         NetCopyIP(&arp->ar_data[ 6], &NetOurIP);
1516                         (void) eth_send((uchar *)et,
1517                                         (pkt - (uchar *)et) + ARP_HDR_SIZE);
1518                         return;
1519
1520                 case ARPOP_REPLY:               /* arp reply */
1521                         /* are we waiting for a reply */
1522                         if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
1523                                 break;
1524
1525 #ifdef CONFIG_KEEP_SERVERADDR
1526                         if (NetServerIP == NetArpWaitPacketIP) {
1527                                 char buf[20];
1528                                 sprintf(buf, "%pM", arp->ar_data);
1529                                 setenv("serveraddr", buf);
1530                         }
1531 #endif
1532
1533                         debug("Got ARP REPLY, set server/gtwy eth addr (%pM)\n",
1534                                 arp->ar_data);
1535
1536                         tmp = NetReadIP(&arp->ar_data[6]);
1537
1538                         /* matched waiting packet's address */
1539                         if (tmp == NetArpWaitReplyIP) {
1540                                 debug("Got it\n");
1541                                 /* save address for later use */
1542                                 memcpy(NetArpWaitPacketMAC,
1543                                        &arp->ar_data[0], 6);
1544
1545 #ifdef CONFIG_NETCONSOLE
1546                                 (*packetHandler)(0, 0, 0, 0, 0);
1547 #endif
1548                                 /* modify header, and transmit it */
1549                                 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6);
1550                                 (void) eth_send(NetArpWaitTxPacket,
1551                                                 NetArpWaitTxPacketSize);
1552
1553                                 /* no arp request pending now */
1554                                 NetArpWaitPacketIP = 0;
1555                                 NetArpWaitTxPacketSize = 0;
1556                                 NetArpWaitPacketMAC = NULL;
1557
1558                         }
1559                         return;
1560                 default:
1561                         debug("Unexpected ARP opcode 0x%x\n",
1562                               ntohs(arp->ar_op));
1563                         return;
1564                 }
1565                 break;
1566
1567 #ifdef CONFIG_CMD_RARP
1568         case PROT_RARP:
1569                 debug("Got RARP\n");
1570                 arp = (ARP_t *)ip;
1571                 if (len < ARP_HDR_SIZE) {
1572                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1573                         return;
1574                 }
1575
1576                 if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
1577                         (ntohs(arp->ar_hrd) != ARP_ETHER)   ||
1578                         (ntohs(arp->ar_pro) != PROT_IP)     ||
1579                         (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
1580
1581                         puts ("invalid RARP header\n");
1582                 } else {
1583                         NetCopyIP(&NetOurIP,    &arp->ar_data[16]);
1584                         if (NetServerIP == 0)
1585                                 NetCopyIP(&NetServerIP, &arp->ar_data[ 6]);
1586                         memcpy (NetServerEther, &arp->ar_data[ 0], 6);
1587
1588                         (*packetHandler)(0, 0, 0, 0, 0);
1589                 }
1590                 break;
1591 #endif
1592         case PROT_IP:
1593                 debug("Got IP\n");
1594                 /* Before we start poking the header, make sure it is there */
1595                 if (len < IP_HDR_SIZE) {
1596                         debug("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE);
1597                         return;
1598                 }
1599                 /* Check the packet length */
1600                 if (len < ntohs(ip->ip_len)) {
1601                         printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
1602                         return;
1603                 }
1604                 len = ntohs(ip->ip_len);
1605                 debug("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
1606
1607                 /* Can't deal with anything except IPv4 */
1608                 if ((ip->ip_hl_v & 0xf0) != 0x40) {
1609                         return;
1610                 }
1611                 /* Can't deal with IP options (headers != 20 bytes) */
1612                 if ((ip->ip_hl_v & 0x0f) > 0x05) {
1613                         return;
1614                 }
1615                 /* Check the Checksum of the header */
1616                 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
1617                         puts ("checksum bad\n");
1618                         return;
1619                 }
1620                 /* If it is not for us, ignore it */
1621                 tmp = NetReadIP(&ip->ip_dst);
1622                 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
1623 #ifdef CONFIG_MCAST_TFTP
1624                         if (Mcast_addr != tmp)
1625 #endif
1626                         return;
1627                 }
1628                 /* Read source IP address for later use */
1629                 src_ip = NetReadIP(&ip->ip_src);
1630                 /*
1631                  * The function returns the unchanged packet if it's not
1632                  * a fragment, and either the complete packet or NULL if
1633                  * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1634                  */
1635                 if (!(ip = NetDefragment(ip, &len)))
1636                         return;
1637                 /*
1638                  * watch for ICMP host redirects
1639                  *
1640                  * There is no real handler code (yet). We just watch
1641                  * for ICMP host redirect messages. In case anybody
1642                  * sees these messages: please contact me
1643                  * (wd@denx.de), or - even better - send me the
1644                  * necessary fixes :-)
1645                  *
1646                  * Note: in all cases where I have seen this so far
1647                  * it was a problem with the router configuration,
1648                  * for instance when a router was configured in the
1649                  * BOOTP reply, but the TFTP server was on the same
1650                  * subnet. So this is probably a warning that your
1651                  * configuration might be wrong. But I'm not really
1652                  * sure if there aren't any other situations.
1653                  */
1654                 if (ip->ip_p == IPPROTO_ICMP) {
1655                         ICMP_t *icmph = (ICMP_t *)&(ip->udp_src);
1656
1657                         switch (icmph->type) {
1658                         case ICMP_REDIRECT:
1659                                 if (icmph->code != ICMP_REDIR_HOST)
1660                                         return;
1661                                 printf (" ICMP Host Redirect to %pI4 ",
1662                                         &icmph->un.gateway);
1663                                 return;
1664 #if defined(CONFIG_CMD_PING)
1665                         case ICMP_ECHO_REPLY:
1666                                 /*
1667                                  * IP header OK.  Pass the packet to the
1668                                  * current handler.
1669                                  */
1670                                 /* XXX point to ip packet */
1671                                 (*packetHandler)((uchar *)ip, 0, src_ip, 0, 0);
1672                                 return;
1673                         case ICMP_ECHO_REQUEST:
1674                                 debug("Got ICMP ECHO REQUEST, return %d bytes\n",
1675                                       ETHER_HDR_SIZE + len);
1676
1677                                 memcpy (&et->et_dest[0], &et->et_src[0], 6);
1678                                 memcpy (&et->et_src[ 0], NetOurEther, 6);
1679
1680                                 ip->ip_sum = 0;
1681                                 ip->ip_off = 0;
1682                                 NetCopyIP((void*)&ip->ip_dst, &ip->ip_src);
1683                                 NetCopyIP((void*)&ip->ip_src, &NetOurIP);
1684                                 ip->ip_sum = ~NetCksum((uchar *)ip,
1685                                                        IP_HDR_SIZE_NO_UDP >> 1);
1686
1687                                 icmph->type = ICMP_ECHO_REPLY;
1688                                 icmph->checksum = 0;
1689                                 icmph->checksum = ~NetCksum((uchar *)icmph,
1690                                         (len - IP_HDR_SIZE_NO_UDP) >> 1);
1691                                 (void) eth_send((uchar *)et,
1692                                                 ETHER_HDR_SIZE + len);
1693                                 return;
1694 #endif
1695                         default:
1696                                 return;
1697                         }
1698                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1699                         return;
1700                 }
1701
1702 #ifdef CONFIG_UDP_CHECKSUM
1703                 if (ip->udp_xsum != 0) {
1704                         ulong   xsum;
1705                         ushort *sumptr;
1706                         ushort  sumlen;
1707
1708                         xsum  = ip->ip_p;
1709                         xsum += (ntohs(ip->udp_len));
1710                         xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
1711                         xsum += (ntohl(ip->ip_src) >>  0) & 0x0000ffff;
1712                         xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
1713                         xsum += (ntohl(ip->ip_dst) >>  0) & 0x0000ffff;
1714
1715                         sumlen = ntohs(ip->udp_len);
1716                         sumptr = (ushort *) &(ip->udp_src);
1717
1718                         while (sumlen > 1) {
1719                                 ushort sumdata;
1720
1721                                 sumdata = *sumptr++;
1722                                 xsum += ntohs(sumdata);
1723                                 sumlen -= 2;
1724                         }
1725                         if (sumlen > 0) {
1726                                 ushort sumdata;
1727
1728                                 sumdata = *(unsigned char *) sumptr;
1729                                 sumdata = (sumdata << 8) & 0xff00;
1730                                 xsum += sumdata;
1731                         }
1732                         while ((xsum >> 16) != 0) {
1733                                 xsum = (xsum & 0x0000ffff) +
1734                                        ((xsum >> 16) & 0x0000ffff);
1735                         }
1736                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1737                                 printf(" UDP wrong checksum %08lx %08x\n",
1738                                         xsum, ntohs(ip->udp_xsum));
1739                                 return;
1740                         }
1741                 }
1742 #endif
1743
1744
1745 #ifdef CONFIG_NETCONSOLE
1746                 nc_input_packet((uchar *)ip +IP_HDR_SIZE,
1747                                                 ntohs(ip->udp_dst),
1748                                                 ntohs(ip->udp_src),
1749                                                 ntohs(ip->udp_len) - 8);
1750 #endif
1751                 /*
1752                  *      IP header OK.  Pass the packet to the current handler.
1753                  */
1754                 (*packetHandler)((uchar *)ip +IP_HDR_SIZE,
1755                                                 ntohs(ip->udp_dst),
1756                                                 src_ip,
1757                                                 ntohs(ip->udp_src),
1758                                                 ntohs(ip->udp_len) - 8);
1759                 break;
1760         }
1761 }
1762
1763
1764 /**********************************************************************/
1765
1766 static int net_check_prereq (proto_t protocol)
1767 {
1768         switch (protocol) {
1769                 /* Fall through */
1770 #if defined(CONFIG_CMD_PING)
1771         case PING:
1772                 if (NetPingIP == 0) {
1773                         puts ("*** ERROR: ping address not given\n");
1774                         return (1);
1775                 }
1776                 goto common;
1777 #endif
1778 #if defined(CONFIG_CMD_SNTP)
1779         case SNTP:
1780                 if (NetNtpServerIP == 0) {
1781                         puts ("*** ERROR: NTP server address not given\n");
1782                         return (1);
1783                 }
1784                 goto common;
1785 #endif
1786 #if defined(CONFIG_CMD_DNS)
1787         case DNS:
1788                 if (NetOurDNSIP == 0) {
1789                         puts("*** ERROR: DNS server address not given\n");
1790                         return 1;
1791                 }
1792                 goto common;
1793 #endif
1794 #if defined(CONFIG_CMD_NFS)
1795         case NFS:
1796 #endif
1797         case TFTP:
1798                 if (NetServerIP == 0) {
1799                         puts ("*** ERROR: `serverip' not set\n");
1800                         return (1);
1801                 }
1802 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
1803     defined(CONFIG_CMD_DNS)
1804     common:
1805 #endif
1806                 /* Fall through */
1807
1808         case NETCONS:
1809                 if (NetOurIP == 0) {
1810                         puts ("*** ERROR: `ipaddr' not set\n");
1811                         return (1);
1812                 }
1813                 /* Fall through */
1814
1815 #ifdef CONFIG_CMD_RARP
1816         case RARP:
1817 #endif
1818         case BOOTP:
1819         case CDP:
1820         case DHCP:
1821                 if (memcmp (NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
1822 #ifdef CONFIG_NET_MULTI
1823                         extern int eth_get_dev_index (void);
1824                         int num = eth_get_dev_index ();
1825
1826                         switch (num) {
1827                         case -1:
1828                                 puts ("*** ERROR: No ethernet found.\n");
1829                                 return (1);
1830                         case 0:
1831                                 puts ("*** ERROR: `ethaddr' not set\n");
1832                                 break;
1833                         default:
1834                                 printf ("*** ERROR: `eth%daddr' not set\n",
1835                                         num);
1836                                 break;
1837                         }
1838
1839                         NetStartAgain ();
1840                         return (2);
1841 #else
1842                         puts ("*** ERROR: `ethaddr' not set\n");
1843                         return (1);
1844 #endif
1845                 }
1846                 /* Fall through */
1847         default:
1848                 return (0);
1849         }
1850         return (0);             /* OK */
1851 }
1852 /**********************************************************************/
1853
1854 int
1855 NetCksumOk(uchar * ptr, int len)
1856 {
1857         return !((NetCksum(ptr, len) + 1) & 0xfffe);
1858 }
1859
1860
1861 unsigned
1862 NetCksum(uchar * ptr, int len)
1863 {
1864         ulong   xsum;
1865         ushort *p = (ushort *)ptr;
1866
1867         xsum = 0;
1868         while (len-- > 0)
1869                 xsum += *p++;
1870         xsum = (xsum & 0xffff) + (xsum >> 16);
1871         xsum = (xsum & 0xffff) + (xsum >> 16);
1872         return (xsum & 0xffff);
1873 }
1874
1875 int
1876 NetEthHdrSize(void)
1877 {
1878         ushort myvlanid;
1879
1880         myvlanid = ntohs(NetOurVLAN);
1881         if (myvlanid == (ushort)-1)
1882                 myvlanid = VLAN_NONE;
1883
1884         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1885                 VLAN_ETHER_HDR_SIZE;
1886 }
1887
1888 int
1889 NetSetEther(volatile uchar * xet, uchar * addr, uint prot)
1890 {
1891         Ethernet_t *et = (Ethernet_t *)xet;
1892         ushort myvlanid;
1893
1894         myvlanid = ntohs(NetOurVLAN);
1895         if (myvlanid == (ushort)-1)
1896                 myvlanid = VLAN_NONE;
1897
1898         memcpy (et->et_dest, addr, 6);
1899         memcpy (et->et_src, NetOurEther, 6);
1900         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1901         et->et_protlen = htons(prot);
1902                 return ETHER_HDR_SIZE;
1903         } else {
1904                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet;
1905
1906                 vet->vet_vlan_type = htons(PROT_VLAN);
1907                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1908                 vet->vet_type = htons(prot);
1909                 return VLAN_ETHER_HDR_SIZE;
1910         }
1911 }
1912
1913 void
1914 NetSetIP(volatile uchar * xip, IPaddr_t dest, int dport, int sport, int len)
1915 {
1916         IP_t *ip = (IP_t *)xip;
1917
1918         /*
1919          *      If the data is an odd number of bytes, zero the
1920          *      byte after the last byte so that the checksum
1921          *      will work.
1922          */
1923         if (len & 1)
1924                 xip[IP_HDR_SIZE + len] = 0;
1925
1926         /*
1927          *      Construct an IP and UDP header.
1928          *      (need to set no fragment bit - XXX)
1929          */
1930         /* IP_HDR_SIZE / 4 (not including UDP) */
1931         ip->ip_hl_v  = 0x45;
1932         ip->ip_tos   = 0;
1933         ip->ip_len   = htons(IP_HDR_SIZE + len);
1934         ip->ip_id    = htons(NetIPID++);
1935         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1936         ip->ip_ttl   = 255;
1937         ip->ip_p     = 17;              /* UDP */
1938         ip->ip_sum   = 0;
1939         /* already in network byte order */
1940         NetCopyIP((void*)&ip->ip_src, &NetOurIP);
1941         /* - "" - */
1942         NetCopyIP((void*)&ip->ip_dst, &dest);
1943         ip->udp_src  = htons(sport);
1944         ip->udp_dst  = htons(dport);
1945         ip->udp_len  = htons(8 + len);
1946         ip->udp_xsum = 0;
1947         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
1948 }
1949
1950 void copy_filename (char *dst, const char *src, int size)
1951 {
1952         if (*src && (*src == '"')) {
1953                 ++src;
1954                 --size;
1955         }
1956
1957         while ((--size > 0) && *src && (*src != '"')) {
1958                 *dst++ = *src++;
1959         }
1960         *dst = '\0';
1961 }
1962
1963 #if     defined(CONFIG_CMD_NFS)         || \
1964         defined(CONFIG_CMD_SNTP)        || \
1965         defined(CONFIG_CMD_DNS)
1966 /*
1967  * make port a little random (1024-17407)
1968  * This keeps the math somewhat trivial to compute, and seems to work with
1969  * all supported protocols/clients/servers
1970  */
1971 unsigned int random_port(void)
1972 {
1973         return 1024 + (get_timer(0) % 0x4000);
1974 }
1975 #endif
1976
1977 void ip_to_string (IPaddr_t x, char *s)
1978 {
1979         x = ntohl (x);
1980         sprintf (s, "%d.%d.%d.%d",
1981                  (int) ((x >> 24) & 0xff),
1982                  (int) ((x >> 16) & 0xff),
1983                  (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
1984         );
1985 }
1986
1987 void VLAN_to_string(ushort x, char *s)
1988 {
1989         x = ntohs(x);
1990
1991         if (x == (ushort)-1)
1992                 x = VLAN_NONE;
1993
1994         if (x == VLAN_NONE)
1995                 strcpy(s, "none");
1996         else
1997                 sprintf(s, "%d", x & VLAN_IDMASK);
1998 }
1999
2000 ushort string_to_VLAN(const char *s)
2001 {
2002         ushort id;
2003
2004         if (s == NULL)
2005                 return htons(VLAN_NONE);
2006
2007         if (*s < '0' || *s > '9')
2008                 id = VLAN_NONE;
2009         else
2010                 id = (ushort)simple_strtoul(s, NULL, 10);
2011
2012         return htons(id);
2013 }
2014
2015 ushort getenv_VLAN(char *var)
2016 {
2017         return (string_to_VLAN(getenv(var)));
2018 }