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