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         if (!NetArpWaitTxPacket) {
 375                 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
 376                 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
 377                 NetArpWaitTxPacketSize = 0;
 378         }
 379
 380         eth_halt();
 381 #ifdef CONFIG_NET_MULTI
 382         eth_set_current();
 383 #endif
 384         if (eth_init(bd) < 0) {
 385                 eth_halt();
 386                 return -1;
 387         }
 388
 389 restart:
 390 #ifdef CONFIG_NET_MULTI
 391         memcpy(NetOurEther, eth_get_dev()->enetaddr, 6);
 392 #else
 393         eth_getenv_enetaddr("ethaddr", NetOurEther);
 394 #endif
 395
 396         NetState = NETLOOP_CONTINUE;
 397
 398         /*
 399          *      Start the ball rolling with the given start function.  From
 400          *      here on, this code is a state machine driven by received
 401          *      packets and timer events.
 402          */
 403         NetInitLoop(protocol);
 404
 405         switch (net_check_prereq(protocol)) {
 406         case 1:
 407                 /* network not configured */
 408                 eth_halt();
 409                 return -1;
 410
 411 #ifdef CONFIG_NET_MULTI
 412         case 2:
 413                 /* network device not configured */
 414                 break;
 415 #endif /* CONFIG_NET_MULTI */
 416
 417         case 0:
 418 #ifdef CONFIG_NET_MULTI
 419                 NetDevExists = 1;
 420 #endif
 421                 switch (protocol) {
 422                 case TFTP:
 423                         /* always use ARP to get server ethernet address */
 424                         TftpStart();
 425                         break;
 426 #ifdef CONFIG_CMD_TFTPSRV
 427                 case TFTPSRV:
 428                         TftpStartServer();
 429                         break;
 430 #endif
 431 #if defined(CONFIG_CMD_DHCP)
 432                 case DHCP:
 433                         BootpTry = 0;
 434                         NetOurIP = 0;
 435                         DhcpRequest();          /* Basically same as BOOTP */
 436                         break;
 437 #endif
 438
 439                 case BOOTP:
 440                         BootpTry = 0;
 441                         NetOurIP = 0;
 442                         BootpRequest();
 443                         break;
 444
 445 #if defined(CONFIG_CMD_RARP)
 446                 case RARP:
 447                         RarpTry = 0;
 448                         NetOurIP = 0;
 449                         RarpRequest();
 450                         break;
 451 #endif
 452 #if defined(CONFIG_CMD_PING)
 453                 case PING:
 454                         PingStart();
 455                         break;
 456 #endif
 457 #if defined(CONFIG_CMD_NFS)
 458                 case NFS:
 459                         NfsStart();
 460                         break;
 461 #endif
 462 #if defined(CONFIG_CMD_CDP)
 463                 case CDP:
 464                         CDPStart();
 465                         break;
 466 #endif
 467 #ifdef CONFIG_NETCONSOLE
 468                 case NETCONS:
 469                         NcStart();
 470                         break;
 471 #endif
 472 #if defined(CONFIG_CMD_SNTP)
 473                 case SNTP:
 474                         SntpStart();
 475                         break;
 476 #endif
 477 #if defined(CONFIG_CMD_DNS)
 478                 case DNS:
 479                         DnsStart();
 480                         break;
 481 #endif
 482                 default:
 483                         break;
 484                 }
 485
 486                 NetBootFileXferSize = 0;
 487                 break;
 488         }
 489
 490 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 491 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 492         defined(CONFIG_STATUS_LED)                      && \
 493         defined(STATUS_LED_RED)
 494         /*
 495          * Echo the inverted link state to the fault LED.
 496          */
 497         if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
 498                 status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
 499         else
 500                 status_led_set(STATUS_LED_RED, STATUS_LED_ON);
 501 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 502 #endif /* CONFIG_MII, ... */
 503
 504         /*
 505          *      Main packet reception loop.  Loop receiving packets until
 506          *      someone sets `NetState' to a state that terminates.
 507          */
 508         for (;;) {
 509                 WATCHDOG_RESET();
 510 #ifdef CONFIG_SHOW_ACTIVITY
 511                 {
 512                         extern void show_activity(int arg);
 513                         show_activity(1);
 514                 }
 515 #endif
 516                 /*
 517                  *      Check the ethernet for a new packet.  The ethernet
 518                  *      receive routine will process it.
 519                  */
 520                 eth_rx();
 521
 522                 /*
 523                  *      Abort if ctrl-c was pressed.
 524                  */
 525                 if (ctrlc()) {
 526                         eth_halt();
 527                         puts("\nAbort\n");
 528                         return -1;
 529                 }
 530
 531                 ArpTimeoutCheck();
 532
 533                 /*
 534                  *      Check for a timeout, and run the timeout handler
 535                  *      if we have one.
 536                  */
 537                 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
 538                         thand_f *x;
 539
 540 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 541 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 542         defined(CONFIG_STATUS_LED)                      && \
 543         defined(STATUS_LED_RED)
 544                         /*
 545                          * Echo the inverted link state to the fault LED.
 546                          */
 547                         if (miiphy_link(eth_get_dev()->name,
 548                                        CONFIG_SYS_FAULT_MII_ADDR)) {
 549                                 status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
 550                         } else {
 551                                 status_led_set(STATUS_LED_RED, STATUS_LED_ON);
 552                         }
 553 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 554 #endif /* CONFIG_MII, ... */
 555                         x = timeHandler;
 556                         timeHandler = (thand_f *)0;
 557                         (*x)();
 558                 }
 559
 560
 561                 switch (NetState) {
 562
 563                 case NETLOOP_RESTART:
 564 #ifdef CONFIG_NET_MULTI
 565                         NetRestarted = 1;
 566 #endif
 567                         goto restart;
 568
 569                 case NETLOOP_SUCCESS:
 570                         if (NetBootFileXferSize > 0) {
 571                                 char buf[20];
 572                                 printf("Bytes transferred = %ld (%lx hex)\n",
 573                                         NetBootFileXferSize,
 574                                         NetBootFileXferSize);
 575                                 sprintf(buf, "%lX", NetBootFileXferSize);
 576                                 setenv("filesize", buf);
 577
 578                                 sprintf(buf, "%lX", (unsigned long)load_addr);
 579                                 setenv("fileaddr", buf);
 580                         }
 581                         eth_halt();
 582                         return NetBootFileXferSize;
 583
 584                 case NETLOOP_FAIL:
 585                         return -1;
 586                 }
 587         }
 588 }
 589
 590 /**********************************************************************/
 591
 592 static void
 593 startAgainTimeout(void)
 594 {
 595         NetState = NETLOOP_RESTART;
 596 }
 597
 598 static void
 599 startAgainHandler(uchar *pkt, unsigned dest, IPaddr_t sip,
 600                   unsigned src, unsigned len)
 601 {
 602         /* Totally ignore the packet */
 603 }
 604
 605 void NetStartAgain(void)
 606 {
 607         char *nretry;
 608         int retry_forever = 0;
 609         unsigned long retrycnt = 0;
 610
 611         nretry = getenv("netretry");
 612         if (nretry) {
 613                 if (!strcmp(nretry, "yes"))
 614                         retry_forever = 1;
 615                 else if (!strcmp(nretry, "no"))
 616                         retrycnt = 0;
 617                 else if (!strcmp(nretry, "once"))
 618                         retrycnt = 1;
 619                 else
 620                         retrycnt = simple_strtoul(nretry, NULL, 0);
 621         } else
 622                 retry_forever = 1;
 623
 624         if ((!retry_forever) && (NetTryCount >= retrycnt)) {
 625                 eth_halt();
 626                 NetState = NETLOOP_FAIL;
 627                 return;
 628         }
 629
 630         NetTryCount++;
 631
 632 #ifndef CONFIG_NET_MULTI
 633         NetSetTimeout(10000UL, startAgainTimeout);
 634         NetSetHandler(startAgainHandler);
 635 #else   /* !CONFIG_NET_MULTI*/
 636         eth_halt();
 637 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
 638         eth_try_another(!NetRestarted);
 639 #endif
 640         eth_init(gd->bd);
 641         if (NetRestartWrap) {
 642                 NetRestartWrap = 0;
 643                 if (NetDevExists) {
 644                         NetSetTimeout(10000UL, startAgainTimeout);
 645                         NetSetHandler(startAgainHandler);
 646                 } else {
 647                         NetState = NETLOOP_FAIL;
 648                 }
 649         } else {
 650                 NetState = NETLOOP_RESTART;
 651         }
 652 #endif  /* CONFIG_NET_MULTI */
 653 }
 654
 655 /**********************************************************************/
 656 /*
 657  *      Miscelaneous bits.
 658  */
 659
 660 void
 661 NetSetHandler(rxhand_f *f)
 662 {
 663         packetHandler = f;
 664 }
 665
 666
 667 void
 668 NetSetTimeout(ulong iv, thand_f *f)
 669 {
 670         if (iv == 0) {
 671                 timeHandler = (thand_f *)0;
 672         } else {
 673                 timeHandler = f;
 674                 timeStart = get_timer(0);
 675                 timeDelta = iv;
 676         }
 677 }
 678
 679
 680 void
 681 NetSendPacket(volatile uchar *pkt, int len)
 682 {
 683         (void) eth_send(pkt, len);
 684 }
 685
 686 int
 687 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
 688 {
 689         uchar *pkt;
 690
 691         /* convert to new style broadcast */
 692         if (dest == 0)
 693                 dest = 0xFFFFFFFF;
 694
 695         /* if broadcast, make the ether address a broadcast and don't do ARP */
 696         if (dest == 0xFFFFFFFF)
 697                 ether = NetBcastAddr;
 698
 699         /*
 700          * if MAC address was not discovered yet, save the packet and do
 701          * an ARP request
 702          */
 703         if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
 704
 705                 debug("sending ARP for %08lx\n", dest);
 706
 707                 NetArpWaitPacketIP = dest;
 708                 NetArpWaitPacketMAC = ether;
 709
 710                 pkt = NetArpWaitTxPacket;
 711                 pkt += NetSetEther(pkt, NetArpWaitPacketMAC, PROT_IP);
 712
 713                 NetSetIP(pkt, dest, dport, sport, len);
 714                 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket +
 715                        (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len);
 716
 717                 /* size of the waiting packet */
 718                 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) +
 719                         IP_HDR_SIZE + len;
 720
 721                 /* and do the ARP request */
 722                 NetArpWaitTry = 1;
 723                 NetArpWaitTimerStart = get_timer(0);
 724                 ArpRequest();
 725                 return 1;       /* waiting */
 726         }
 727
 728         debug("sending UDP to %08lx/%pM\n", dest, ether);
 729
 730         pkt = (uchar *)NetTxPacket;
 731         pkt += NetSetEther(pkt, ether, PROT_IP);
 732         NetSetIP(pkt, dest, dport, sport, len);
 733         (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len);
 734
 735         return 0;       /* transmitted */
 736 }
 737
 738 #if defined(CONFIG_CMD_PING)
 739 static ushort PingSeqNo;
 740
 741 int PingSend(void)
 742 {
 743         static uchar mac[6];
 744         volatile IP_t *ip;
 745         volatile ushort *s;
 746         uchar *pkt;
 747
 748         /* XXX always send arp request */
 749
 750         memcpy(mac, NetEtherNullAddr, 6);
 751
 752         debug("sending ARP for %08lx\n", NetPingIP);
 753
 754         NetArpWaitPacketIP = NetPingIP;
 755         NetArpWaitPacketMAC = mac;
 756
 757         pkt = NetArpWaitTxPacket;
 758         pkt += NetSetEther(pkt, mac, PROT_IP);
 759
 760         ip = (volatile IP_t *)pkt;
 761
 762         /*
 763          * Construct an IP and ICMP header.
 764          * (need to set no fragment bit - XXX)
 765          */
 766         /* IP_HDR_SIZE / 4 (not including UDP) */
 767         ip->ip_hl_v  = 0x45;
 768         ip->ip_tos   = 0;
 769         ip->ip_len   = htons(IP_HDR_SIZE_NO_UDP + 8);
 770         ip->ip_id    = htons(NetIPID++);
 771         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
 772         ip->ip_ttl   = 255;
 773         ip->ip_p     = 0x01;            /* ICMP */
 774         ip->ip_sum   = 0;
 775         /* already in network byte order */
 776         NetCopyIP((void *)&ip->ip_src, &NetOurIP);
 777         /* - "" - */
 778         NetCopyIP((void *)&ip->ip_dst, &NetPingIP);
 779         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
 780
 781         s = &ip->udp_src;               /* XXX ICMP starts here */
 782         s[0] = htons(0x0800);           /* echo-request, code */
 783         s[1] = 0;                       /* checksum */
 784         s[2] = 0;                       /* identifier */
 785         s[3] = htons(PingSeqNo++);      /* sequence number */
 786         s[1] = ~NetCksum((uchar *)s, 8/2);
 787
 788         /* size of the waiting packet */
 789         NetArpWaitTxPacketSize =
 790                 (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8;
 791
 792         /* and do the ARP request */
 793         NetArpWaitTry = 1;
 794         NetArpWaitTimerStart = get_timer(0);
 795         ArpRequest();
 796         return 1;       /* waiting */
 797 }
 798
 799 static void
 800 PingTimeout(void)
 801 {
 802         eth_halt();
 803         NetState = NETLOOP_FAIL;        /* we did not get the reply */
 804 }
 805
 806 static void
 807 PingHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
 808             unsigned len)
 809 {
 810         if (sip != NetPingIP)
 811                 return;
 812
 813         NetState = NETLOOP_SUCCESS;
 814 }
 815
 816 static void PingStart(void)
 817 {
 818 #if defined(CONFIG_NET_MULTI)
 819         printf("Using %s device\n", eth_get_name());
 820 #endif  /* CONFIG_NET_MULTI */
 821         NetSetTimeout(10000UL, PingTimeout);
 822         NetSetHandler(PingHandler);
 823
 824         PingSend();
 825 }
 826 #endif
 827
 828 #if defined(CONFIG_CMD_CDP)
 829
 830 #define CDP_DEVICE_ID_TLV               0x0001
 831 #define CDP_ADDRESS_TLV                 0x0002
 832 #define CDP_PORT_ID_TLV                 0x0003
 833 #define CDP_CAPABILITIES_TLV            0x0004
 834 #define CDP_VERSION_TLV                 0x0005
 835 #define CDP_PLATFORM_TLV                0x0006
 836 #define CDP_NATIVE_VLAN_TLV             0x000a
 837 #define CDP_APPLIANCE_VLAN_TLV          0x000e
 838 #define CDP_TRIGGER_TLV                 0x000f
 839 #define CDP_POWER_CONSUMPTION_TLV       0x0010
 840 #define CDP_SYSNAME_TLV                 0x0014
 841 #define CDP_SYSOBJECT_TLV               0x0015
 842 #define CDP_MANAGEMENT_ADDRESS_TLV      0x0016
 843
 844 #define CDP_TIMEOUT                     250UL   /* one packet every 250ms */
 845
 846 static int CDPSeq;
 847 static int CDPOK;
 848
 849 ushort CDPNativeVLAN;
 850 ushort CDPApplianceVLAN;
 851
 852 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20,
 853                                        0x00 };
 854
 855 static ushort CDP_compute_csum(const uchar *buff, ushort len)
 856 {
 857         ushort csum;
 858         int     odd;
 859         ulong   result = 0;
 860         ushort  leftover;
 861         ushort *p;
 862
 863         if (len > 0) {
 864                 odd = 1 & (ulong)buff;
 865                 if (odd) {
 866                         result = *buff << 8;
 867                         len--;
 868                         buff++;
 869                 }
 870                 while (len > 1) {
 871                         p = (ushort *)buff;
 872                         result += *p++;
 873                         buff = (uchar *)p;
 874                         if (result & 0x80000000)
 875                                 result = (result & 0xFFFF) + (result >> 16);
 876                         len -= 2;
 877                 }
 878                 if (len) {
 879                         leftover = (signed short)(*(const signed char *)buff);
 880                         /* CISCO SUCKS big time! (and blows too):
 881                          * CDP uses the IP checksum algorithm with a twist;
 882                          * for the last byte it *sign* extends and sums.
 883                          */
 884                         result = (result & 0xffff0000) |
 885                                  ((result + leftover) & 0x0000ffff);
 886                 }
 887                 while (result >> 16)
 888                         result = (result & 0xFFFF) + (result >> 16);
 889
 890                 if (odd)
 891                         result = ((result >> 8) & 0xff) |
 892                                  ((result & 0xff) << 8);
 893         }
 894
 895         /* add up 16-bit and 17-bit words for 17+c bits */
 896         result = (result & 0xffff) + (result >> 16);
 897         /* add up 16-bit and 2-bit for 16+c bit */
 898         result = (result & 0xffff) + (result >> 16);
 899         /* add up carry.. */
 900         result = (result & 0xffff) + (result >> 16);
 901
 902         /* negate */
 903         csum = ~(ushort)result;
 904
 905         /* run time endian detection */
 906         if (csum != htons(csum))        /* little endian */
 907                 csum = htons(csum);
 908
 909         return csum;
 910 }
 911
 912 int CDPSendTrigger(void)
 913 {
 914         volatile uchar *pkt;
 915         volatile ushort *s;
 916         volatile ushort *cp;
 917         Ethernet_t *et;
 918         int len;
 919         ushort chksum;
 920 #if     defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID)   || \
 921         defined(CONFIG_CDP_VERSION)   || defined(CONFIG_CDP_PLATFORM)
 922         char buf[32];
 923 #endif
 924
 925         pkt = NetTxPacket;
 926         et = (Ethernet_t *)pkt;
 927
 928         /* NOTE: trigger sent not on any VLAN */
 929
 930         /* form ethernet header */
 931         memcpy(et->et_dest, NetCDPAddr, 6);
 932         memcpy(et->et_src, NetOurEther, 6);
 933
 934         pkt += ETHER_HDR_SIZE;
 935
 936         /* SNAP header */
 937         memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr));
 938         pkt += sizeof(CDP_SNAP_hdr);
 939
 940         /* CDP header */
 941         *pkt++ = 0x02;                          /* CDP version 2 */
 942         *pkt++ = 180;                           /* TTL */
 943         s = (volatile ushort *)pkt;
 944         cp = s;
 945         /* checksum (0 for later calculation) */
 946         *s++ = htons(0);
 947
 948         /* CDP fields */
 949 #ifdef CONFIG_CDP_DEVICE_ID
 950         *s++ = htons(CDP_DEVICE_ID_TLV);
 951         *s++ = htons(CONFIG_CDP_DEVICE_ID);
 952         sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%pm", NetOurEther);
 953         memcpy((uchar *)s, buf, 16);
 954         s += 16 / 2;
 955 #endif
 956
 957 #ifdef CONFIG_CDP_PORT_ID
 958         *s++ = htons(CDP_PORT_ID_TLV);
 959         memset(buf, 0, sizeof(buf));
 960         sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index());
 961         len = strlen(buf);
 962         if (len & 1)    /* make it even */
 963                 len++;
 964         *s++ = htons(len + 4);
 965         memcpy((uchar *)s, buf, len);
 966         s += len / 2;
 967 #endif
 968
 969 #ifdef CONFIG_CDP_CAPABILITIES
 970         *s++ = htons(CDP_CAPABILITIES_TLV);
 971         *s++ = htons(8);
 972         *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES);
 973         s += 2;
 974 #endif
 975
 976 #ifdef CONFIG_CDP_VERSION
 977         *s++ = htons(CDP_VERSION_TLV);
 978         memset(buf, 0, sizeof(buf));
 979         strcpy(buf, CONFIG_CDP_VERSION);
 980         len = strlen(buf);
 981         if (len & 1)    /* make it even */
 982                 len++;
 983         *s++ = htons(len + 4);
 984         memcpy((uchar *)s, buf, len);
 985         s += len / 2;
 986 #endif
 987
 988 #ifdef CONFIG_CDP_PLATFORM
 989         *s++ = htons(CDP_PLATFORM_TLV);
 990         memset(buf, 0, sizeof(buf));
 991         strcpy(buf, CONFIG_CDP_PLATFORM);
 992         len = strlen(buf);
 993         if (len & 1)    /* make it even */
 994                 len++;
 995         *s++ = htons(len + 4);
 996         memcpy((uchar *)s, buf, len);
 997         s += len / 2;
 998 #endif
 999
1000 #ifdef CONFIG_CDP_TRIGGER
1001         *s++ = htons(CDP_TRIGGER_TLV);
1002         *s++ = htons(8);
1003         *(ulong *)s = htonl(CONFIG_CDP_TRIGGER);
1004         s += 2;
1005 #endif
1006
1007 #ifdef CONFIG_CDP_POWER_CONSUMPTION
1008         *s++ = htons(CDP_POWER_CONSUMPTION_TLV);
1009         *s++ = htons(6);
1010         *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION);
1011 #endif
1012
1013         /* length of ethernet packet */
1014         len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE);
1015         et->et_protlen = htons(len);
1016
1017         len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr);
1018         chksum = CDP_compute_csum((uchar *)NetTxPacket + len,
1019                                   (uchar *)s - (NetTxPacket + len));
1020         if (chksum == 0)
1021                 chksum = 0xFFFF;
1022         *cp = htons(chksum);
1023
1024         (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket);
1025         return 0;
1026 }
1027
1028 static void
1029 CDPTimeout(void)
1030 {
1031         CDPSeq++;
1032
1033         if (CDPSeq < 3) {
1034                 NetSetTimeout(CDP_TIMEOUT, CDPTimeout);
1035                 CDPSendTrigger();
1036                 return;
1037         }
1038
1039         /* if not OK try again */
1040         if (!CDPOK)
1041                 NetStartAgain();
1042         else
1043                 NetState = NETLOOP_SUCCESS;
1044 }
1045
1046 static void
1047 CDPDummyHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
1048                 unsigned len)
1049 {
1050         /* nothing */
1051 }
1052
1053 static void
1054 CDPHandler(const uchar *pkt, unsigned len)
1055 {
1056         const uchar *t;
1057         const ushort *ss;
1058         ushort type, tlen;
1059         uchar applid;
1060         ushort vlan, nvlan;
1061
1062         /* minimum size? */
1063         if (len < sizeof(CDP_SNAP_hdr) + 4)
1064                 goto pkt_short;
1065
1066         /* check for valid CDP SNAP header */
1067         if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0)
1068                 return;
1069
1070         pkt += sizeof(CDP_SNAP_hdr);
1071         len -= sizeof(CDP_SNAP_hdr);
1072
1073         /* Version of CDP protocol must be >= 2 and TTL != 0 */
1074         if (pkt[0] < 0x02 || pkt[1] == 0)
1075                 return;
1076
1077         /*
1078          * if version is greater than 0x02 maybe we'll have a problem;
1079          * output a warning
1080          */
1081         if (pkt[0] != 0x02)
1082                 printf("** WARNING: CDP packet received with a protocol version %d > 2\n",
1083                                 pkt[0] & 0xff);
1084
1085         if (CDP_compute_csum(pkt, len) != 0)
1086                 return;
1087
1088         pkt += 4;
1089         len -= 4;
1090
1091         vlan = htons(-1);
1092         nvlan = htons(-1);
1093         while (len > 0) {
1094                 if (len < 4)
1095                         goto pkt_short;
1096
1097                 ss = (const ushort *)pkt;
1098                 type = ntohs(ss[0]);
1099                 tlen = ntohs(ss[1]);
1100                 if (tlen > len)
1101                         goto pkt_short;
1102
1103                 pkt += tlen;
1104                 len -= tlen;
1105
1106                 ss += 2;        /* point ss to the data of the TLV */
1107                 tlen -= 4;
1108
1109                 switch (type) {
1110                 case CDP_DEVICE_ID_TLV:
1111                         break;
1112                 case CDP_ADDRESS_TLV:
1113                         break;
1114                 case CDP_PORT_ID_TLV:
1115                         break;
1116                 case CDP_CAPABILITIES_TLV:
1117                         break;
1118                 case CDP_VERSION_TLV:
1119                         break;
1120                 case CDP_PLATFORM_TLV:
1121                         break;
1122                 case CDP_NATIVE_VLAN_TLV:
1123                         nvlan = *ss;
1124                         break;
1125                 case CDP_APPLIANCE_VLAN_TLV:
1126                         t = (const uchar *)ss;
1127                         while (tlen > 0) {
1128                                 if (tlen < 3)
1129                                         goto pkt_short;
1130
1131                                 applid = t[0];
1132                                 ss = (const ushort *)(t + 1);
1133
1134 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE
1135                                 if (applid == 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                 if (ntohs(arp->ar_pro) != PROT_IP)
1483                         return;
1484                 if (arp->ar_hln != 6)
1485                         return;
1486                 if (arp->ar_pln != 4)
1487                         return;
1488
1489                 if (NetOurIP == 0)
1490                         return;
1491
1492                 if (NetReadIP(&arp->ar_data[16]) != NetOurIP)
1493                         return;
1494
1495                 switch (ntohs(arp->ar_op)) {
1496                 case ARPOP_REQUEST:
1497                         /* reply with our IP address */
1498                         debug("Got ARP REQUEST, return our IP\n");
1499                         pkt = (uchar *)et;
1500                         pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
1501                         arp->ar_op = htons(ARPOP_REPLY);
1502                         memcpy(&arp->ar_data[10], &arp->ar_data[0], 6);
1503                         NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
1504                         memcpy(&arp->ar_data[0], NetOurEther, 6);
1505                         NetCopyIP(&arp->ar_data[6], &NetOurIP);
1506                         (void) eth_send((uchar *)et,
1507                                         (pkt - (uchar *)et) + ARP_HDR_SIZE);
1508                         return;
1509
1510                 case ARPOP_REPLY:               /* arp reply */
1511                         /* are we waiting for a reply */
1512                         if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
1513                                 break;
1514
1515 #ifdef CONFIG_KEEP_SERVERADDR
1516                         if (NetServerIP == NetArpWaitPacketIP) {
1517                                 char buf[20];
1518                                 sprintf(buf, "%pM", arp->ar_data);
1519                                 setenv("serveraddr", buf);
1520                         }
1521 #endif
1522
1523                         debug("Got ARP REPLY, set server/gtwy eth addr (%pM)\n",
1524                                 arp->ar_data);
1525
1526                         tmp = NetReadIP(&arp->ar_data[6]);
1527
1528                         /* matched waiting packet's address */
1529                         if (tmp == NetArpWaitReplyIP) {
1530                                 debug("Got it\n");
1531                                 /* save address for later use */
1532                                 memcpy(NetArpWaitPacketMAC,
1533                                        &arp->ar_data[0], 6);
1534
1535 #ifdef CONFIG_NETCONSOLE
1536                                 (*packetHandler)(0, 0, 0, 0, 0);
1537 #endif
1538                                 /* modify header, and transmit it */
1539                                 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6);
1540                                 (void) eth_send(NetArpWaitTxPacket,
1541                                                 NetArpWaitTxPacketSize);
1542
1543                                 /* no arp request pending now */
1544                                 NetArpWaitPacketIP = 0;
1545                                 NetArpWaitTxPacketSize = 0;
1546                                 NetArpWaitPacketMAC = NULL;
1547
1548                         }
1549                         return;
1550                 default:
1551                         debug("Unexpected ARP opcode 0x%x\n",
1552                               ntohs(arp->ar_op));
1553                         return;
1554                 }
1555                 break;
1556
1557 #ifdef CONFIG_CMD_RARP
1558         case PROT_RARP:
1559                 debug("Got RARP\n");
1560                 arp = (ARP_t *)ip;
1561                 if (len < ARP_HDR_SIZE) {
1562                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1563                         return;
1564                 }
1565
1566                 if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
1567                         (ntohs(arp->ar_hrd) != ARP_ETHER)   ||
1568                         (ntohs(arp->ar_pro) != PROT_IP)     ||
1569                         (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
1570
1571                         puts("invalid RARP header\n");
1572                 } else {
1573                         NetCopyIP(&NetOurIP, &arp->ar_data[16]);
1574                         if (NetServerIP == 0)
1575                                 NetCopyIP(&NetServerIP, &arp->ar_data[6]);
1576                         memcpy(NetServerEther, &arp->ar_data[0], 6);
1577
1578                         (*packetHandler)(0, 0, 0, 0, 0);
1579                 }
1580                 break;
1581 #endif
1582         case PROT_IP:
1583                 debug("Got IP\n");
1584                 /* Before we start poking the header, make sure it is there */
1585                 if (len < IP_HDR_SIZE) {
1586                         debug("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE);
1587                         return;
1588                 }
1589                 /* Check the packet length */
1590                 if (len < ntohs(ip->ip_len)) {
1591                         printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
1592                         return;
1593                 }
1594                 len = ntohs(ip->ip_len);
1595                 debug("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
1596
1597                 /* Can't deal with anything except IPv4 */
1598                 if ((ip->ip_hl_v & 0xf0) != 0x40)
1599                         return;
1600                 /* Can't deal with IP options (headers != 20 bytes) */
1601                 if ((ip->ip_hl_v & 0x0f) > 0x05)
1602                         return;
1603                 /* Check the Checksum of the header */
1604                 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
1605                         puts("checksum bad\n");
1606                         return;
1607                 }
1608                 /* If it is not for us, ignore it */
1609                 tmp = NetReadIP(&ip->ip_dst);
1610                 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
1611 #ifdef CONFIG_MCAST_TFTP
1612                         if (Mcast_addr != tmp)
1613 #endif
1614                                 return;
1615                 }
1616                 /* Read source IP address for later use */
1617                 src_ip = NetReadIP(&ip->ip_src);
1618                 /*
1619                  * The function returns the unchanged packet if it's not
1620                  * a fragment, and either the complete packet or NULL if
1621                  * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1622                  */
1623                 ip = NetDefragment(ip, &len);
1624                 if (!ip)
1625                         return;
1626                 /*
1627                  * watch for ICMP host redirects
1628                  *
1629                  * There is no real handler code (yet). We just watch
1630                  * for ICMP host redirect messages. In case anybody
1631                  * sees these messages: please contact me
1632                  * (wd@denx.de), or - even better - send me the
1633                  * necessary fixes :-)
1634                  *
1635                  * Note: in all cases where I have seen this so far
1636                  * it was a problem with the router configuration,
1637                  * for instance when a router was configured in the
1638                  * BOOTP reply, but the TFTP server was on the same
1639                  * subnet. So this is probably a warning that your
1640                  * configuration might be wrong. But I'm not really
1641                  * sure if there aren't any other situations.
1642                  */
1643                 if (ip->ip_p == IPPROTO_ICMP) {
1644                         ICMP_t *icmph = (ICMP_t *)&(ip->udp_src);
1645
1646                         switch (icmph->type) {
1647                         case ICMP_REDIRECT:
1648                                 if (icmph->code != ICMP_REDIR_HOST)
1649                                         return;
1650                                 printf(" ICMP Host Redirect to %pI4 ",
1651                                         &icmph->un.gateway);
1652                                 return;
1653 #if defined(CONFIG_CMD_PING)
1654                         case ICMP_ECHO_REPLY:
1655                                 /*
1656                                  * IP header OK.  Pass the packet to the
1657                                  * current handler.
1658                                  */
1659                                 /* XXX point to ip packet */
1660                                 (*packetHandler)((uchar *)ip, 0, src_ip, 0, 0);
1661                                 return;
1662                         case ICMP_ECHO_REQUEST:
1663                                 debug("Got ICMP ECHO REQUEST, return %d bytes\n",
1664                                       ETHER_HDR_SIZE + len);
1665
1666                                 memcpy(&et->et_dest[0], &et->et_src[0], 6);
1667                                 memcpy(&et->et_src[0], NetOurEther, 6);
1668
1669                                 ip->ip_sum = 0;
1670                                 ip->ip_off = 0;
1671                                 NetCopyIP((void *)&ip->ip_dst, &ip->ip_src);
1672                                 NetCopyIP((void *)&ip->ip_src, &NetOurIP);
1673                                 ip->ip_sum = ~NetCksum((uchar *)ip,
1674                                                        IP_HDR_SIZE_NO_UDP >> 1);
1675
1676                                 icmph->type = ICMP_ECHO_REPLY;
1677                                 icmph->checksum = 0;
1678                                 icmph->checksum = ~NetCksum((uchar *)icmph,
1679                                         (len - IP_HDR_SIZE_NO_UDP) >> 1);
1680                                 (void) eth_send((uchar *)et,
1681                                                 ETHER_HDR_SIZE + len);
1682                                 return;
1683 #endif
1684                         default:
1685                                 return;
1686                         }
1687                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1688                         return;
1689                 }
1690
1691 #ifdef CONFIG_UDP_CHECKSUM
1692                 if (ip->udp_xsum != 0) {
1693                         ulong   xsum;
1694                         ushort *sumptr;
1695                         ushort  sumlen;
1696
1697                         xsum  = ip->ip_p;
1698                         xsum += (ntohs(ip->udp_len));
1699                         xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
1700                         xsum += (ntohl(ip->ip_src) >>  0) & 0x0000ffff;
1701                         xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
1702                         xsum += (ntohl(ip->ip_dst) >>  0) & 0x0000ffff;
1703
1704                         sumlen = ntohs(ip->udp_len);
1705                         sumptr = (ushort *) &(ip->udp_src);
1706
1707                         while (sumlen > 1) {
1708                                 ushort sumdata;
1709
1710                                 sumdata = *sumptr++;
1711                                 xsum += ntohs(sumdata);
1712                                 sumlen -= 2;
1713                         }
1714                         if (sumlen > 0) {
1715                                 ushort sumdata;
1716
1717                                 sumdata = *(unsigned char *) sumptr;
1718                                 sumdata = (sumdata << 8) & 0xff00;
1719                                 xsum += sumdata;
1720                         }
1721                         while ((xsum >> 16) != 0) {
1722                                 xsum = (xsum & 0x0000ffff) +
1723                                        ((xsum >> 16) & 0x0000ffff);
1724                         }
1725                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1726                                 printf(" UDP wrong checksum %08lx %08x\n",
1727                                         xsum, ntohs(ip->udp_xsum));
1728                                 return;
1729                         }
1730                 }
1731 #endif
1732
1733
1734 #ifdef CONFIG_NETCONSOLE
1735                 nc_input_packet((uchar *)ip + IP_HDR_SIZE,
1736                                                 ntohs(ip->udp_dst),
1737                                                 ntohs(ip->udp_src),
1738                                                 ntohs(ip->udp_len) - 8);
1739 #endif
1740                 /*
1741                  *      IP header OK.  Pass the packet to the current handler.
1742                  */
1743                 (*packetHandler)((uchar *)ip + IP_HDR_SIZE,
1744                                                 ntohs(ip->udp_dst),
1745                                                 src_ip,
1746                                                 ntohs(ip->udp_src),
1747                                                 ntohs(ip->udp_len) - 8);
1748                 break;
1749         }
1750 }
1751
1752
1753 /**********************************************************************/
1754
1755 static int net_check_prereq(proto_t protocol)
1756 {
1757         switch (protocol) {
1758                 /* Fall through */
1759 #if defined(CONFIG_CMD_PING)
1760         case PING:
1761                 if (NetPingIP == 0) {
1762                         puts("*** ERROR: ping address not given\n");
1763                         return 1;
1764                 }
1765                 goto common;
1766 #endif
1767 #if defined(CONFIG_CMD_SNTP)
1768         case SNTP:
1769                 if (NetNtpServerIP == 0) {
1770                         puts("*** ERROR: NTP server address not given\n");
1771                         return 1;
1772                 }
1773                 goto common;
1774 #endif
1775 #if defined(CONFIG_CMD_DNS)
1776         case DNS:
1777                 if (NetOurDNSIP == 0) {
1778                         puts("*** ERROR: DNS server address not given\n");
1779                         return 1;
1780                 }
1781                 goto common;
1782 #endif
1783 #if defined(CONFIG_CMD_NFS)
1784         case NFS:
1785 #endif
1786         case TFTP:
1787                 if (NetServerIP == 0) {
1788                         puts("*** ERROR: `serverip' not set\n");
1789                         return 1;
1790                 }
1791 #if     defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
1792         defined(CONFIG_CMD_DNS)
1793 common:
1794 #endif
1795                 /* Fall through */
1796
1797         case NETCONS:
1798         case TFTPSRV:
1799                 if (NetOurIP == 0) {
1800                         puts("*** ERROR: `ipaddr' not set\n");
1801                         return 1;
1802                 }
1803                 /* Fall through */
1804
1805 #ifdef CONFIG_CMD_RARP
1806         case RARP:
1807 #endif
1808         case BOOTP:
1809         case CDP:
1810         case DHCP:
1811                 if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
1812 #ifdef CONFIG_NET_MULTI
1813                         extern int eth_get_dev_index(void);
1814                         int num = eth_get_dev_index();
1815
1816                         switch (num) {
1817                         case -1:
1818                                 puts("*** ERROR: No ethernet found.\n");
1819                                 return 1;
1820                         case 0:
1821                                 puts("*** ERROR: `ethaddr' not set\n");
1822                                 break;
1823                         default:
1824                                 printf("*** ERROR: `eth%daddr' not set\n",
1825                                         num);
1826                                 break;
1827                         }
1828
1829                         NetStartAgain();
1830                         return 2;
1831 #else
1832                         puts("*** ERROR: `ethaddr' not set\n");
1833                         return 1;
1834 #endif
1835                 }
1836                 /* Fall through */
1837         default:
1838                 return 0;
1839         }
1840         return 0;               /* OK */
1841 }
1842 /**********************************************************************/
1843
1844 int
1845 NetCksumOk(uchar *ptr, int len)
1846 {
1847         return !((NetCksum(ptr, len) + 1) & 0xfffe);
1848 }
1849
1850
1851 unsigned
1852 NetCksum(uchar *ptr, int len)
1853 {
1854         ulong   xsum;
1855         ushort *p = (ushort *)ptr;
1856
1857         xsum = 0;
1858         while (len-- > 0)
1859                 xsum += *p++;
1860         xsum = (xsum & 0xffff) + (xsum >> 16);
1861         xsum = (xsum & 0xffff) + (xsum >> 16);
1862         return xsum & 0xffff;
1863 }
1864
1865 int
1866 NetEthHdrSize(void)
1867 {
1868         ushort myvlanid;
1869
1870         myvlanid = ntohs(NetOurVLAN);
1871         if (myvlanid == (ushort)-1)
1872                 myvlanid = VLAN_NONE;
1873
1874         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1875                 VLAN_ETHER_HDR_SIZE;
1876 }
1877
1878 int
1879 NetSetEther(volatile uchar *xet, uchar * addr, uint prot)
1880 {
1881         Ethernet_t *et = (Ethernet_t *)xet;
1882         ushort myvlanid;
1883
1884         myvlanid = ntohs(NetOurVLAN);
1885         if (myvlanid == (ushort)-1)
1886                 myvlanid = VLAN_NONE;
1887
1888         memcpy(et->et_dest, addr, 6);
1889         memcpy(et->et_src, NetOurEther, 6);
1890         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1891                 et->et_protlen = htons(prot);
1892                 return ETHER_HDR_SIZE;
1893         } else {
1894                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet;
1895
1896                 vet->vet_vlan_type = htons(PROT_VLAN);
1897                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1898                 vet->vet_type = htons(prot);
1899                 return VLAN_ETHER_HDR_SIZE;
1900         }
1901 }
1902
1903 void
1904 NetSetIP(volatile uchar *xip, IPaddr_t dest, int dport, int sport, int len)
1905 {
1906         IP_t *ip = (IP_t *)xip;
1907
1908         /*
1909          *      If the data is an odd number of bytes, zero the
1910          *      byte after the last byte so that the checksum
1911          *      will work.
1912          */
1913         if (len & 1)
1914                 xip[IP_HDR_SIZE + len] = 0;
1915
1916         /*
1917          *      Construct an IP and UDP header.
1918          *      (need to set no fragment bit - XXX)
1919          */
1920         /* IP_HDR_SIZE / 4 (not including UDP) */
1921         ip->ip_hl_v  = 0x45;
1922         ip->ip_tos   = 0;
1923         ip->ip_len   = htons(IP_HDR_SIZE + len);
1924         ip->ip_id    = htons(NetIPID++);
1925         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1926         ip->ip_ttl   = 255;
1927         ip->ip_p     = 17;              /* UDP */
1928         ip->ip_sum   = 0;
1929         /* already in network byte order */
1930         NetCopyIP((void *)&ip->ip_src, &NetOurIP);
1931         /* - "" - */
1932         NetCopyIP((void *)&ip->ip_dst, &dest);
1933         ip->udp_src  = htons(sport);
1934         ip->udp_dst  = htons(dport);
1935         ip->udp_len  = htons(8 + len);
1936         ip->udp_xsum = 0;
1937         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
1938 }
1939
1940 void copy_filename(char *dst, const char *src, int size)
1941 {
1942         if (*src && (*src == '"')) {
1943                 ++src;
1944                 --size;
1945         }
1946
1947         while ((--size > 0) && *src && (*src != '"'))
1948                 *dst++ = *src++;
1949         *dst = '\0';
1950 }
1951
1952 #if     defined(CONFIG_CMD_NFS)         || \
1953         defined(CONFIG_CMD_SNTP)        || \
1954         defined(CONFIG_CMD_DNS)
1955 /*
1956  * make port a little random (1024-17407)
1957  * This keeps the math somewhat trivial to compute, and seems to work with
1958  * all supported protocols/clients/servers
1959  */
1960 unsigned int random_port(void)
1961 {
1962         return 1024 + (get_timer(0) % 0x4000);
1963 }
1964 #endif
1965
1966 void ip_to_string(IPaddr_t x, char *s)
1967 {
1968         x = ntohl(x);
1969         sprintf(s, "%d.%d.%d.%d",
1970                 (int) ((x >> 24) & 0xff),
1971                 (int) ((x >> 16) & 0xff),
1972                 (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
1973         );
1974 }
1975
1976 void VLAN_to_string(ushort x, char *s)
1977 {
1978         x = ntohs(x);
1979
1980         if (x == (ushort)-1)
1981                 x = VLAN_NONE;
1982
1983         if (x == VLAN_NONE)
1984                 strcpy(s, "none");
1985         else
1986                 sprintf(s, "%d", x & VLAN_IDMASK);
1987 }
1988
1989 ushort string_to_VLAN(const char *s)
1990 {
1991         ushort id;
1992
1993         if (s == NULL)
1994                 return htons(VLAN_NONE);
1995
1996         if (*s < '0' || *s > '9')
1997                 id = VLAN_NONE;
1998         else
1999                 id = (ushort)simple_strtoul(s, NULL, 10);
2000
2001         return htons(id);
2002 }
2003
2004 ushort getenv_VLAN(char *var)
2005 {
2006         return string_to_VLAN(getenv(var));
2007 }