git.sur5r.net Git - u-boot/blob - 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 /* Tried all network devices */
 173 int             NetRestartWrap;
 174 /* Network loop restarted */
 175 static int      NetRestarted;
 176 /* At least one device configured */
 177 static int      NetDevExists;
 178
 179 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
 180 /* default is without VLAN */
 181 ushort          NetOurVLAN = 0xFFFF;
 182 /* ditto */
 183 ushort          NetOurNativeVLAN = 0xFFFF;
 184
 185 /* Boot File name */
 186 char            BootFile[128];
 187
 188 #if defined(CONFIG_CMD_PING)
 189 /* the ip address to ping */
 190 IPaddr_t        NetPingIP;
 191
 192 static void PingStart(void);
 193 #endif
 194
 195 #if defined(CONFIG_CMD_CDP)
 196 static void CDPStart(void);
 197 #endif
 198
 199 #if defined(CONFIG_CMD_SNTP)
 200 /* NTP server IP address */
 201 IPaddr_t        NetNtpServerIP;
 202 /* offset time from UTC */
 203 int             NetTimeOffset;
 204 #endif
 205
 206 #ifdef CONFIG_NETCONSOLE
 207 void NcStart(void);
 208 int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len);
 209 #endif
 210
 211 volatile uchar  PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 212
 213 /* Receive packet */
 214 volatile uchar *NetRxPackets[PKTBUFSRX];
 215
 216 /* Current RX packet handler */
 217 static rxhand_f *packetHandler;
 218 #ifdef CONFIG_CMD_TFTPPUT
 219 static rxhand_icmp_f *packet_icmp_handler;      /* Current ICMP rx handler */
 220 #endif
 221 /* Current timeout handler */
 222 static thand_f *timeHandler;
 223 /* Time base value */
 224 static ulong    timeStart;
 225 /* Current timeout value */
 226 static ulong    timeDelta;
 227 /* THE transmit packet */
 228 volatile uchar *NetTxPacket;
 229
 230 static int net_check_prereq(enum proto_t protocol);
 231
 232 static int NetTryCount;
 233
 234 /**********************************************************************/
 235
 236 IPaddr_t        NetArpWaitPacketIP;
 237 IPaddr_t        NetArpWaitReplyIP;
 238 /* MAC address of waiting packet's destination */
 239 uchar          *NetArpWaitPacketMAC;
 240 /* THE transmit packet */
 241 uchar          *NetArpWaitTxPacket;
 242 int             NetArpWaitTxPacketSize;
 243 uchar           NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
 244 ulong           NetArpWaitTimerStart;
 245 int             NetArpWaitTry;
 246
 247 void ArpRequest(void)
 248 {
 249         int i;
 250         volatile uchar *pkt;
 251         ARP_t *arp;
 252
 253         debug("ARP broadcast %d\n", NetArpWaitTry);
 254
 255         pkt = NetTxPacket;
 256
 257         pkt += NetSetEther(pkt, NetBcastAddr, PROT_ARP);
 258
 259         arp = (ARP_t *) pkt;
 260
 261         arp->ar_hrd = htons(ARP_ETHER);
 262         arp->ar_pro = htons(PROT_IP);
 263         arp->ar_hln = 6;
 264         arp->ar_pln = 4;
 265         arp->ar_op = htons(ARPOP_REQUEST);
 266
 267         /* source ET addr */
 268         memcpy(&arp->ar_data[0], NetOurEther, 6);
 269         /* source IP addr */
 270         NetWriteIP((uchar *) &arp->ar_data[6], NetOurIP);
 271         for (i = 10; i < 16; ++i) {
 272                 /* dest ET addr = 0 */
 273                 arp->ar_data[i] = 0;
 274         }
 275
 276         if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
 277             (NetOurIP & NetOurSubnetMask)) {
 278                 if (NetOurGatewayIP == 0) {
 279                         puts("## Warning: gatewayip needed but not set\n");
 280                         NetArpWaitReplyIP = NetArpWaitPacketIP;
 281                 } else {
 282                         NetArpWaitReplyIP = NetOurGatewayIP;
 283                 }
 284         } else {
 285                 NetArpWaitReplyIP = NetArpWaitPacketIP;
 286         }
 287
 288         NetWriteIP((uchar *) &arp->ar_data[16], NetArpWaitReplyIP);
 289         (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
 290 }
 291
 292 void ArpTimeoutCheck(void)
 293 {
 294         ulong t;
 295
 296         if (!NetArpWaitPacketIP)
 297                 return;
 298
 299         t = get_timer(0);
 300
 301         /* check for arp timeout */
 302         if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT) {
 303                 NetArpWaitTry++;
 304
 305                 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
 306                         puts("\nARP Retry count exceeded; starting again\n");
 307                         NetArpWaitTry = 0;
 308                         NetStartAgain();
 309                 } else {
 310                         NetArpWaitTimerStart = t;
 311                         ArpRequest();
 312                 }
 313         }
 314 }
 315
 316 static void NetInitLoop(enum 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                 NetOurIP = getenv_IPaddr("ipaddr");
 325                 NetCopyIP(&bd->bi_ip_addr, &NetOurIP);
 326                 NetOurGatewayIP = getenv_IPaddr("gatewayip");
 327                 NetOurSubnetMask = getenv_IPaddr("netmask");
 328                 NetServerIP = getenv_IPaddr("serverip");
 329                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 330                 NetOurVLAN = getenv_VLAN("vlan");
 331 #if defined(CONFIG_CMD_DNS)
 332                 NetOurDNSIP = getenv_IPaddr("dnsip");
 333 #endif
 334                 env_changed_id = env_id;
 335         }
 336
 337         return;
 338 }
 339
 340 /**********************************************************************/
 341 /*
 342  *      Main network processing loop.
 343  */
 344
 345 int NetLoop(enum proto_t protocol)
 346 {
 347         bd_t *bd = gd->bd;
 348         int ret = -1;
 349
 350         NetRestarted = 0;
 351         NetDevExists = 0;
 352
 353         /* XXX problem with bss workaround */
 354         NetArpWaitPacketMAC = NULL;
 355         NetArpWaitTxPacket = NULL;
 356         NetArpWaitPacketIP = 0;
 357         NetArpWaitReplyIP = 0;
 358         NetArpWaitTxPacket = NULL;
 359         NetTxPacket = NULL;
 360         NetTryCount = 1;
 361
 362         if (!NetTxPacket) {
 363                 int     i;
 364                 /*
 365                  *      Setup packet buffers, aligned correctly.
 366                  */
 367                 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
 368                 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
 369                 for (i = 0; i < PKTBUFSRX; i++)
 370                         NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
 371         }
 372
 373         if (!NetArpWaitTxPacket) {
 374                 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
 375                 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
 376                 NetArpWaitTxPacketSize = 0;
 377         }
 378
 379         eth_halt();
 380         eth_set_current();
 381         if (eth_init(bd) < 0) {
 382                 eth_halt();
 383                 return -1;
 384         }
 385
 386 restart:
 387         memcpy(NetOurEther, eth_get_dev()->enetaddr, 6);
 388
 389         NetState = NETLOOP_CONTINUE;
 390
 391         /*
 392          *      Start the ball rolling with the given start function.  From
 393          *      here on, this code is a state machine driven by received
 394          *      packets and timer events.
 395          */
 396         NetInitLoop(protocol);
 397
 398         switch (net_check_prereq(protocol)) {
 399         case 1:
 400                 /* network not configured */
 401                 eth_halt();
 402                 return -1;
 403
 404         case 2:
 405                 /* network device not configured */
 406                 break;
 407
 408         case 0:
 409                 NetDevExists = 1;
 410                 NetBootFileXferSize = 0;
 411                 switch (protocol) {
 412                 case TFTPGET:
 413 #ifdef CONFIG_CMD_TFTPPUT
 414                 case TFTPPUT:
 415 #endif
 416                         /* always use ARP to get server ethernet address */
 417                         TftpStart(protocol);
 418                         break;
 419 #ifdef CONFIG_CMD_TFTPSRV
 420                 case TFTPSRV:
 421                         TftpStartServer();
 422                         break;
 423 #endif
 424 #if defined(CONFIG_CMD_DHCP)
 425                 case DHCP:
 426                         BootpTry = 0;
 427                         NetOurIP = 0;
 428                         DhcpRequest();          /* Basically same as BOOTP */
 429                         break;
 430 #endif
 431
 432                 case BOOTP:
 433                         BootpTry = 0;
 434                         NetOurIP = 0;
 435                         BootpRequest();
 436                         break;
 437
 438 #if defined(CONFIG_CMD_RARP)
 439                 case RARP:
 440                         RarpTry = 0;
 441                         NetOurIP = 0;
 442                         RarpRequest();
 443                         break;
 444 #endif
 445 #if defined(CONFIG_CMD_PING)
 446                 case PING:
 447                         PingStart();
 448                         break;
 449 #endif
 450 #if defined(CONFIG_CMD_NFS)
 451                 case NFS:
 452                         NfsStart();
 453                         break;
 454 #endif
 455 #if defined(CONFIG_CMD_CDP)
 456                 case CDP:
 457                         CDPStart();
 458                         break;
 459 #endif
 460 #ifdef CONFIG_NETCONSOLE
 461                 case NETCONS:
 462                         NcStart();
 463                         break;
 464 #endif
 465 #if defined(CONFIG_CMD_SNTP)
 466                 case SNTP:
 467                         SntpStart();
 468                         break;
 469 #endif
 470 #if defined(CONFIG_CMD_DNS)
 471                 case DNS:
 472                         DnsStart();
 473                         break;
 474 #endif
 475                 default:
 476                         break;
 477                 }
 478
 479                 break;
 480         }
 481
 482 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 483 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 484         defined(CONFIG_STATUS_LED)                      && \
 485         defined(STATUS_LED_RED)
 486         /*
 487          * Echo the inverted link state to the fault LED.
 488          */
 489         if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
 490                 status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
 491         else
 492                 status_led_set(STATUS_LED_RED, STATUS_LED_ON);
 493 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 494 #endif /* CONFIG_MII, ... */
 495
 496         /*
 497          *      Main packet reception loop.  Loop receiving packets until
 498          *      someone sets `NetState' to a state that terminates.
 499          */
 500         for (;;) {
 501                 WATCHDOG_RESET();
 502 #ifdef CONFIG_SHOW_ACTIVITY
 503                 {
 504                         extern void show_activity(int arg);
 505                         show_activity(1);
 506                 }
 507 #endif
 508                 /*
 509                  *      Check the ethernet for a new packet.  The ethernet
 510                  *      receive routine will process it.
 511                  */
 512                 eth_rx();
 513
 514                 /*
 515                  *      Abort if ctrl-c was pressed.
 516                  */
 517                 if (ctrlc()) {
 518                         eth_halt();
 519                         puts("\nAbort\n");
 520                         goto done;
 521                 }
 522
 523                 ArpTimeoutCheck();
 524
 525                 /*
 526                  *      Check for a timeout, and run the timeout handler
 527                  *      if we have one.
 528                  */
 529                 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
 530                         thand_f *x;
 531
 532 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 533 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 534         defined(CONFIG_STATUS_LED)                      && \
 535         defined(STATUS_LED_RED)
 536                         /*
 537                          * Echo the inverted link state to the fault LED.
 538                          */
 539                         if (miiphy_link(eth_get_dev()->name,
 540                                        CONFIG_SYS_FAULT_MII_ADDR)) {
 541                                 status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
 542                         } else {
 543                                 status_led_set(STATUS_LED_RED, STATUS_LED_ON);
 544                         }
 545 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 546 #endif /* CONFIG_MII, ... */
 547                         x = timeHandler;
 548                         timeHandler = (thand_f *)0;
 549                         (*x)();
 550                 }
 551
 552
 553                 switch (NetState) {
 554
 555                 case NETLOOP_RESTART:
 556                         NetRestarted = 1;
 557                         goto restart;
 558
 559                 case NETLOOP_SUCCESS:
 560                         if (NetBootFileXferSize > 0) {
 561                                 char buf[20];
 562                                 printf("Bytes transferred = %ld (%lx hex)\n",
 563                                         NetBootFileXferSize,
 564                                         NetBootFileXferSize);
 565                                 sprintf(buf, "%lX", NetBootFileXferSize);
 566                                 setenv("filesize", buf);
 567
 568                                 sprintf(buf, "%lX", (unsigned long)load_addr);
 569                                 setenv("fileaddr", buf);
 570                         }
 571                         eth_halt();
 572                         ret = NetBootFileXferSize;
 573                         goto done;
 574
 575                 case NETLOOP_FAIL:
 576                         goto done;
 577                 }
 578         }
 579
 580 done:
 581 #ifdef CONFIG_CMD_TFTPPUT
 582         /* Clear out the handlers */
 583         NetSetHandler(NULL);
 584         net_set_icmp_handler(NULL);
 585 #endif
 586         return ret;
 587 }
 588
 589 /**********************************************************************/
 590
 591 static void
 592 startAgainTimeout(void)
 593 {
 594         NetState = NETLOOP_RESTART;
 595 }
 596
 597 static void
 598 startAgainHandler(uchar *pkt, unsigned dest, IPaddr_t sip,
 599                   unsigned src, unsigned len)
 600 {
 601         /* Totally ignore the packet */
 602 }
 603
 604 void NetStartAgain(void)
 605 {
 606         char *nretry;
 607         int retry_forever = 0;
 608         unsigned long retrycnt = 0;
 609
 610         nretry = getenv("netretry");
 611         if (nretry) {
 612                 if (!strcmp(nretry, "yes"))
 613                         retry_forever = 1;
 614                 else if (!strcmp(nretry, "no"))
 615                         retrycnt = 0;
 616                 else if (!strcmp(nretry, "once"))
 617                         retrycnt = 1;
 618                 else
 619                         retrycnt = simple_strtoul(nretry, NULL, 0);
 620         } else
 621                 retry_forever = 1;
 622
 623         if ((!retry_forever) && (NetTryCount >= retrycnt)) {
 624                 eth_halt();
 625                 NetState = NETLOOP_FAIL;
 626                 return;
 627         }
 628
 629         NetTryCount++;
 630
 631         eth_halt();
 632 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
 633         eth_try_another(!NetRestarted);
 634 #endif
 635         eth_init(gd->bd);
 636         if (NetRestartWrap) {
 637                 NetRestartWrap = 0;
 638                 if (NetDevExists) {
 639                         NetSetTimeout(10000UL, startAgainTimeout);
 640                         NetSetHandler(startAgainHandler);
 641                 } else {
 642                         NetState = NETLOOP_FAIL;
 643                 }
 644         } else {
 645                 NetState = NETLOOP_RESTART;
 646         }
 647 }
 648
 649 /**********************************************************************/
 650 /*
 651  *      Miscelaneous bits.
 652  */
 653
 654 void
 655 NetSetHandler(rxhand_f *f)
 656 {
 657         packetHandler = f;
 658 }
 659
 660 #ifdef CONFIG_CMD_TFTPPUT
 661 void net_set_icmp_handler(rxhand_icmp_f *f)
 662 {
 663         packet_icmp_handler = f;
 664 }
 665 #endif
 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         printf("Using %s device\n", eth_get_name());
 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                 pkt += tlen;
1102                 len -= tlen;
1103
1104                 ss += 2;        /* point ss to the data of the TLV */
1105                 tlen -= 4;
1106
1107                 switch (type) {
1108                 case CDP_DEVICE_ID_TLV:
1109                         break;
1110                 case CDP_ADDRESS_TLV:
1111                         break;
1112                 case CDP_PORT_ID_TLV:
1113                         break;
1114                 case CDP_CAPABILITIES_TLV:
1115                         break;
1116                 case CDP_VERSION_TLV:
1117                         break;
1118                 case CDP_PLATFORM_TLV:
1119                         break;
1120                 case CDP_NATIVE_VLAN_TLV:
1121                         nvlan = *ss;
1122                         break;
1123                 case CDP_APPLIANCE_VLAN_TLV:
1124                         t = (const uchar *)ss;
1125                         while (tlen > 0) {
1126                                 if (tlen < 3)
1127                                         goto pkt_short;
1128
1129                                 applid = t[0];
1130                                 ss = (const ushort *)(t + 1);
1131
1132 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE
1133                                 if (applid == CONFIG_CDP_APPLIANCE_VLAN_TYPE)
1134                                         vlan = *ss;
1135 #else
1136                                 /* XXX will this work; dunno */
1137                                 vlan = ntohs(*ss);
1138 #endif
1139                                 t += 3; tlen -= 3;
1140                         }
1141                         break;
1142                 case CDP_TRIGGER_TLV:
1143                         break;
1144                 case CDP_POWER_CONSUMPTION_TLV:
1145                         break;
1146                 case CDP_SYSNAME_TLV:
1147                         break;
1148                 case CDP_SYSOBJECT_TLV:
1149                         break;
1150                 case CDP_MANAGEMENT_ADDRESS_TLV:
1151                         break;
1152                 }
1153         }
1154
1155         CDPApplianceVLAN = vlan;
1156         CDPNativeVLAN = nvlan;
1157
1158         CDPOK = 1;
1159         return;
1160
1161  pkt_short:
1162         printf("** CDP packet is too short\n");
1163         return;
1164 }
1165
1166 static void CDPStart(void)
1167 {
1168         printf("Using %s device\n", eth_get_name());
1169         CDPSeq = 0;
1170         CDPOK = 0;
1171
1172         CDPNativeVLAN = htons(-1);
1173         CDPApplianceVLAN = htons(-1);
1174
1175         NetSetTimeout(CDP_TIMEOUT, CDPTimeout);
1176         NetSetHandler(CDPDummyHandler);
1177
1178         CDPSendTrigger();
1179 }
1180 #endif
1181
1182 #ifdef CONFIG_IP_DEFRAG
1183 /*
1184  * This function collects fragments in a single packet, according
1185  * to the algorithm in RFC815. It returns NULL or the pointer to
1186  * a complete packet, in static storage
1187  */
1188 #ifndef CONFIG_NET_MAXDEFRAG
1189 #define CONFIG_NET_MAXDEFRAG 16384
1190 #endif
1191 /*
1192  * MAXDEFRAG, above, is chosen in the config file and  is real data
1193  * so we need to add the NFS overhead, which is more than TFTP.
1194  * To use sizeof in the internal unnamed structures, we need a real
1195  * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately).
1196  * The compiler doesn't complain nor allocates the actual structure
1197  */
1198 static struct rpc_t rpc_specimen;
1199 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply))
1200
1201 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE_NO_UDP)
1202
1203 /*
1204  * this is the packet being assembled, either data or frag control.
1205  * Fragments go by 8 bytes, so this union must be 8 bytes long
1206  */
1207 struct hole {
1208         /* first_byte is address of this structure */
1209         u16 last_byte;  /* last byte in this hole + 1 (begin of next hole) */
1210         u16 next_hole;  /* index of next (in 8-b blocks), 0 == none */
1211         u16 prev_hole;  /* index of prev, 0 == none */
1212         u16 unused;
1213 };
1214
1215 static IP_t *__NetDefragment(IP_t *ip, int *lenp)
1216 {
1217         static uchar pkt_buff[IP_PKTSIZE] __attribute__((aligned(PKTALIGN)));
1218         static u16 first_hole, total_len;
1219         struct hole *payload, *thisfrag, *h, *newh;
1220         IP_t *localip = (IP_t *)pkt_buff;
1221         uchar *indata = (uchar *)ip;
1222         int offset8, start, len, done = 0;
1223         u16 ip_off = ntohs(ip->ip_off);
1224
1225         /* payload starts after IP header, this fragment is in there */
1226         payload = (struct hole *)(pkt_buff + IP_HDR_SIZE_NO_UDP);
1227         offset8 =  (ip_off & IP_OFFS);
1228         thisfrag = payload + offset8;
1229         start = offset8 * 8;
1230         len = ntohs(ip->ip_len) - IP_HDR_SIZE_NO_UDP;
1231
1232         if (start + len > IP_MAXUDP) /* fragment extends too far */
1233                 return NULL;
1234
1235         if (!total_len || localip->ip_id != ip->ip_id) {
1236                 /* new (or different) packet, reset structs */
1237                 total_len = 0xffff;
1238                 payload[0].last_byte = ~0;
1239                 payload[0].next_hole = 0;
1240                 payload[0].prev_hole = 0;
1241                 first_hole = 0;
1242                 /* any IP header will work, copy the first we received */
1243                 memcpy(localip, ip, IP_HDR_SIZE_NO_UDP);
1244         }
1245
1246         /*
1247          * What follows is the reassembly algorithm. We use the payload
1248          * array as a linked list of hole descriptors, as each hole starts
1249          * at a multiple of 8 bytes. However, last byte can be whatever value,
1250          * so it is represented as byte count, not as 8-byte blocks.
1251          */
1252
1253         h = payload + first_hole;
1254         while (h->last_byte < start) {
1255                 if (!h->next_hole) {
1256                         /* no hole that far away */
1257                         return NULL;
1258                 }
1259                 h = payload + h->next_hole;
1260         }
1261
1262         /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
1263         if (offset8 + ((len + 7) / 8) <= h - payload) {
1264                 /* no overlap with holes (dup fragment?) */
1265                 return NULL;
1266         }
1267
1268         if (!(ip_off & IP_FLAGS_MFRAG)) {
1269                 /* no more fragmentss: truncate this (last) hole */
1270                 total_len = start + len;
1271                 h->last_byte = start + len;
1272         }
1273
1274         /*
1275          * There is some overlap: fix the hole list. This code doesn't
1276          * deal with a fragment that overlaps with two different holes
1277          * (thus being a superset of a previously-received fragment).
1278          */
1279
1280         if ((h >= thisfrag) && (h->last_byte <= start + len)) {
1281                 /* complete overlap with hole: remove hole */
1282                 if (!h->prev_hole && !h->next_hole) {
1283                         /* last remaining hole */
1284                         done = 1;
1285                 } else if (!h->prev_hole) {
1286                         /* first hole */
1287                         first_hole = h->next_hole;
1288                         payload[h->next_hole].prev_hole = 0;
1289                 } else if (!h->next_hole) {
1290                         /* last hole */
1291                         payload[h->prev_hole].next_hole = 0;
1292                 } else {
1293                         /* in the middle of the list */
1294                         payload[h->next_hole].prev_hole = h->prev_hole;
1295                         payload[h->prev_hole].next_hole = h->next_hole;
1296                 }
1297
1298         } else if (h->last_byte <= start + len) {
1299                 /* overlaps with final part of the hole: shorten this hole */
1300                 h->last_byte = start;
1301
1302         } else if (h >= thisfrag) {
1303                 /* overlaps with initial part of the hole: move this hole */
1304                 newh = thisfrag + (len / 8);
1305                 *newh = *h;
1306                 h = newh;
1307                 if (h->next_hole)
1308                         payload[h->next_hole].prev_hole = (h - payload);
1309                 if (h->prev_hole)
1310                         payload[h->prev_hole].next_hole = (h - payload);
1311                 else
1312                         first_hole = (h - payload);
1313
1314         } else {
1315                 /* fragment sits in the middle: split the hole */
1316                 newh = thisfrag + (len / 8);
1317                 *newh = *h;
1318                 h->last_byte = start;
1319                 h->next_hole = (newh - payload);
1320                 newh->prev_hole = (h - payload);
1321                 if (newh->next_hole)
1322                         payload[newh->next_hole].prev_hole = (newh - payload);
1323         }
1324
1325         /* finally copy this fragment and possibly return whole packet */
1326         memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE_NO_UDP, len);
1327         if (!done)
1328                 return NULL;
1329
1330         localip->ip_len = htons(total_len);
1331         *lenp = total_len + IP_HDR_SIZE_NO_UDP;
1332         return localip;
1333 }
1334
1335 static inline IP_t *NetDefragment(IP_t *ip, int *lenp)
1336 {
1337         u16 ip_off = ntohs(ip->ip_off);
1338         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1339                 return ip; /* not a fragment */
1340         return __NetDefragment(ip, lenp);
1341 }
1342
1343 #else /* !CONFIG_IP_DEFRAG */
1344
1345 static inline IP_t *NetDefragment(IP_t *ip, int *lenp)
1346 {
1347         u16 ip_off = ntohs(ip->ip_off);
1348         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1349                 return ip; /* not a fragment */
1350         return NULL;
1351 }
1352 #endif
1353
1354 /**
1355  * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
1356  * drop others.
1357  *
1358  * @parma ip    IP packet containing the ICMP
1359  */
1360 static void receive_icmp(IP_t *ip, int len, IPaddr_t src_ip, Ethernet_t *et)
1361 {
1362         ICMP_t *icmph = (ICMP_t *)&ip->udp_src;
1363
1364         switch (icmph->type) {
1365         case ICMP_REDIRECT:
1366                 if (icmph->code != ICMP_REDIR_HOST)
1367                         return;
1368                 printf(" ICMP Host Redirect to %pI4 ",
1369                         &icmph->un.gateway);
1370                 break;
1371 #if defined(CONFIG_CMD_PING)
1372         case ICMP_ECHO_REPLY:
1373                 /*
1374                         * IP header OK.  Pass the packet to the
1375                         * current handler.
1376                         */
1377                 /*
1378                  * XXX point to ip packet - should this use
1379                  * packet_icmp_handler?
1380                  */
1381                 (*packetHandler)((uchar *)ip, 0, src_ip, 0, 0);
1382                 break;
1383         case ICMP_ECHO_REQUEST:
1384                 debug("Got ICMP ECHO REQUEST, return %d bytes\n",
1385                         ETHER_HDR_SIZE + len);
1386
1387                 memcpy(&et->et_dest[0], &et->et_src[0], 6);
1388                 memcpy(&et->et_src[0], NetOurEther, 6);
1389
1390                 ip->ip_sum = 0;
1391                 ip->ip_off = 0;
1392                 NetCopyIP((void *)&ip->ip_dst, &ip->ip_src);
1393                 NetCopyIP((void *)&ip->ip_src, &NetOurIP);
1394                 ip->ip_sum = ~NetCksum((uchar *)ip,
1395                                         IP_HDR_SIZE_NO_UDP >> 1);
1396
1397                 icmph->type = ICMP_ECHO_REPLY;
1398                 icmph->checksum = 0;
1399                 icmph->checksum = ~NetCksum((uchar *)icmph,
1400                         (len - IP_HDR_SIZE_NO_UDP) >> 1);
1401                 (void) eth_send((uchar *)et,
1402                                 ETHER_HDR_SIZE + len);
1403                 break;
1404 #endif
1405         default:
1406 #ifdef CONFIG_CMD_TFTPPUT
1407                 if (packet_icmp_handler)
1408                         packet_icmp_handler(icmph->type, icmph->code,
1409                                 ntohs(ip->udp_dst), src_ip, ntohs(ip->udp_src),
1410                                 icmph->un.data, ntohs(ip->udp_len));
1411 #endif
1412                 break;
1413         }
1414 }
1415
1416 void
1417 NetReceive(volatile uchar *inpkt, int len)
1418 {
1419         Ethernet_t *et;
1420         IP_t    *ip;
1421         ARP_t   *arp;
1422         IPaddr_t tmp;
1423         IPaddr_t src_ip;
1424         int     x;
1425         uchar *pkt;
1426 #if defined(CONFIG_CMD_CDP)
1427         int iscdp;
1428 #endif
1429         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1430
1431         debug("packet received\n");
1432
1433         NetRxPacket = inpkt;
1434         NetRxPacketLen = len;
1435         et = (Ethernet_t *)inpkt;
1436
1437         /* too small packet? */
1438         if (len < ETHER_HDR_SIZE)
1439                 return;
1440
1441 #ifdef CONFIG_API
1442         if (push_packet) {
1443                 (*push_packet)(inpkt, len);
1444                 return;
1445         }
1446 #endif
1447
1448 #if defined(CONFIG_CMD_CDP)
1449         /* keep track if packet is CDP */
1450         iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0;
1451 #endif
1452
1453         myvlanid = ntohs(NetOurVLAN);
1454         if (myvlanid == (ushort)-1)
1455                 myvlanid = VLAN_NONE;
1456         mynvlanid = ntohs(NetOurNativeVLAN);
1457         if (mynvlanid == (ushort)-1)
1458                 mynvlanid = VLAN_NONE;
1459
1460         x = ntohs(et->et_protlen);
1461
1462         debug("packet received\n");
1463
1464         if (x < 1514) {
1465                 /*
1466                  *      Got a 802 packet.  Check the other protocol field.
1467                  */
1468                 x = ntohs(et->et_prot);
1469
1470                 ip = (IP_t *)(inpkt + E802_HDR_SIZE);
1471                 len -= E802_HDR_SIZE;
1472
1473         } else if (x != PROT_VLAN) {    /* normal packet */
1474                 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE);
1475                 len -= ETHER_HDR_SIZE;
1476
1477         } else {                        /* VLAN packet */
1478                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et;
1479
1480                 debug("VLAN packet received\n");
1481
1482                 /* too small packet? */
1483                 if (len < VLAN_ETHER_HDR_SIZE)
1484                         return;
1485
1486                 /* if no VLAN active */
1487                 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
1488 #if defined(CONFIG_CMD_CDP)
1489                                 && iscdp == 0
1490 #endif
1491                                 )
1492                         return;
1493
1494                 cti = ntohs(vet->vet_tag);
1495                 vlanid = cti & VLAN_IDMASK;
1496                 x = ntohs(vet->vet_type);
1497
1498                 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE);
1499                 len -= VLAN_ETHER_HDR_SIZE;
1500         }
1501
1502         debug("Receive from protocol 0x%x\n", x);
1503
1504 #if defined(CONFIG_CMD_CDP)
1505         if (iscdp) {
1506                 CDPHandler((uchar *)ip, len);
1507                 return;
1508         }
1509 #endif
1510
1511         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1512                 if (vlanid == VLAN_NONE)
1513                         vlanid = (mynvlanid & VLAN_IDMASK);
1514                 /* not matched? */
1515                 if (vlanid != (myvlanid & VLAN_IDMASK))
1516                         return;
1517         }
1518
1519         switch (x) {
1520
1521         case PROT_ARP:
1522                 /*
1523                  * We have to deal with two types of ARP packets:
1524                  * - REQUEST packets will be answered by sending  our
1525                  *   IP address - if we know it.
1526                  * - REPLY packates are expected only after we asked
1527                  *   for the TFTP server's or the gateway's ethernet
1528                  *   address; so if we receive such a packet, we set
1529                  *   the server ethernet address
1530                  */
1531                 debug("Got ARP\n");
1532
1533                 arp = (ARP_t *)ip;
1534                 if (len < ARP_HDR_SIZE) {
1535                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1536                         return;
1537                 }
1538                 if (ntohs(arp->ar_hrd) != ARP_ETHER)
1539                         return;
1540                 if (ntohs(arp->ar_pro) != PROT_IP)
1541                         return;
1542                 if (arp->ar_hln != 6)
1543                         return;
1544                 if (arp->ar_pln != 4)
1545                         return;
1546
1547                 if (NetOurIP == 0)
1548                         return;
1549
1550                 if (NetReadIP(&arp->ar_data[16]) != NetOurIP)
1551                         return;
1552
1553                 switch (ntohs(arp->ar_op)) {
1554                 case ARPOP_REQUEST:
1555                         /* reply with our IP address */
1556                         debug("Got ARP REQUEST, return our IP\n");
1557                         pkt = (uchar *)et;
1558                         pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
1559                         arp->ar_op = htons(ARPOP_REPLY);
1560                         memcpy(&arp->ar_data[10], &arp->ar_data[0], 6);
1561                         NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
1562                         memcpy(&arp->ar_data[0], NetOurEther, 6);
1563                         NetCopyIP(&arp->ar_data[6], &NetOurIP);
1564                         (void) eth_send((uchar *)et,
1565                                         (pkt - (uchar *)et) + ARP_HDR_SIZE);
1566                         return;
1567
1568                 case ARPOP_REPLY:               /* arp reply */
1569                         /* are we waiting for a reply */
1570                         if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
1571                                 break;
1572
1573 #ifdef CONFIG_KEEP_SERVERADDR
1574                         if (NetServerIP == NetArpWaitPacketIP) {
1575                                 char buf[20];
1576                                 sprintf(buf, "%pM", arp->ar_data);
1577                                 setenv("serveraddr", buf);
1578                         }
1579 #endif
1580
1581                         debug("Got ARP REPLY, set server/gtwy eth addr (%pM)\n",
1582                                 arp->ar_data);
1583
1584                         tmp = NetReadIP(&arp->ar_data[6]);
1585
1586                         /* matched waiting packet's address */
1587                         if (tmp == NetArpWaitReplyIP) {
1588                                 debug("Got it\n");
1589                                 /* save address for later use */
1590                                 memcpy(NetArpWaitPacketMAC,
1591                                        &arp->ar_data[0], 6);
1592
1593 #ifdef CONFIG_NETCONSOLE
1594                                 (*packetHandler)(0, 0, 0, 0, 0);
1595 #endif
1596                                 /* modify header, and transmit it */
1597                                 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6);
1598                                 (void) eth_send(NetArpWaitTxPacket,
1599                                                 NetArpWaitTxPacketSize);
1600
1601                                 /* no arp request pending now */
1602                                 NetArpWaitPacketIP = 0;
1603                                 NetArpWaitTxPacketSize = 0;
1604                                 NetArpWaitPacketMAC = NULL;
1605
1606                         }
1607                         return;
1608                 default:
1609                         debug("Unexpected ARP opcode 0x%x\n",
1610                               ntohs(arp->ar_op));
1611                         return;
1612                 }
1613                 break;
1614
1615 #ifdef CONFIG_CMD_RARP
1616         case PROT_RARP:
1617                 debug("Got RARP\n");
1618                 arp = (ARP_t *)ip;
1619                 if (len < ARP_HDR_SIZE) {
1620                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1621                         return;
1622                 }
1623
1624                 if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
1625                         (ntohs(arp->ar_hrd) != ARP_ETHER)   ||
1626                         (ntohs(arp->ar_pro) != PROT_IP)     ||
1627                         (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
1628
1629                         puts("invalid RARP header\n");
1630                 } else {
1631                         NetCopyIP(&NetOurIP, &arp->ar_data[16]);
1632                         if (NetServerIP == 0)
1633                                 NetCopyIP(&NetServerIP, &arp->ar_data[6]);
1634                         memcpy(NetServerEther, &arp->ar_data[0], 6);
1635
1636                         (*packetHandler)(0, 0, 0, 0, 0);
1637                 }
1638                 break;
1639 #endif
1640         case PROT_IP:
1641                 debug("Got IP\n");
1642                 /* Before we start poking the header, make sure it is there */
1643                 if (len < IP_HDR_SIZE) {
1644                         debug("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE);
1645                         return;
1646                 }
1647                 /* Check the packet length */
1648                 if (len < ntohs(ip->ip_len)) {
1649                         printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
1650                         return;
1651                 }
1652                 len = ntohs(ip->ip_len);
1653                 debug("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
1654
1655                 /* Can't deal with anything except IPv4 */
1656                 if ((ip->ip_hl_v & 0xf0) != 0x40)
1657                         return;
1658                 /* Can't deal with IP options (headers != 20 bytes) */
1659                 if ((ip->ip_hl_v & 0x0f) > 0x05)
1660                         return;
1661                 /* Check the Checksum of the header */
1662                 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
1663                         puts("checksum bad\n");
1664                         return;
1665                 }
1666                 /* If it is not for us, ignore it */
1667                 tmp = NetReadIP(&ip->ip_dst);
1668                 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
1669 #ifdef CONFIG_MCAST_TFTP
1670                         if (Mcast_addr != tmp)
1671 #endif
1672                                 return;
1673                 }
1674                 /* Read source IP address for later use */
1675                 src_ip = NetReadIP(&ip->ip_src);
1676                 /*
1677                  * The function returns the unchanged packet if it's not
1678                  * a fragment, and either the complete packet or NULL if
1679                  * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1680                  */
1681                 ip = NetDefragment(ip, &len);
1682                 if (!ip)
1683                         return;
1684                 /*
1685                  * watch for ICMP host redirects
1686                  *
1687                  * There is no real handler code (yet). We just watch
1688                  * for ICMP host redirect messages. In case anybody
1689                  * sees these messages: please contact me
1690                  * (wd@denx.de), or - even better - send me the
1691                  * necessary fixes :-)
1692                  *
1693                  * Note: in all cases where I have seen this so far
1694                  * it was a problem with the router configuration,
1695                  * for instance when a router was configured in the
1696                  * BOOTP reply, but the TFTP server was on the same
1697                  * subnet. So this is probably a warning that your
1698                  * configuration might be wrong. But I'm not really
1699                  * sure if there aren't any other situations.
1700                  *
1701                  * Simon Glass <sjg@chromium.org>: We get an ICMP when
1702                  * we send a tftp packet to a dead connection, or when
1703                  * there is no server at the other end.
1704                  */
1705                 if (ip->ip_p == IPPROTO_ICMP) {
1706                         receive_icmp(ip, len, src_ip, et);
1707                         return;
1708                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1709                         return;
1710                 }
1711
1712 #ifdef CONFIG_UDP_CHECKSUM
1713                 if (ip->udp_xsum != 0) {
1714                         ulong   xsum;
1715                         ushort *sumptr;
1716                         ushort  sumlen;
1717
1718                         xsum  = ip->ip_p;
1719                         xsum += (ntohs(ip->udp_len));
1720                         xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
1721                         xsum += (ntohl(ip->ip_src) >>  0) & 0x0000ffff;
1722                         xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
1723                         xsum += (ntohl(ip->ip_dst) >>  0) & 0x0000ffff;
1724
1725                         sumlen = ntohs(ip->udp_len);
1726                         sumptr = (ushort *) &(ip->udp_src);
1727
1728                         while (sumlen > 1) {
1729                                 ushort sumdata;
1730
1731                                 sumdata = *sumptr++;
1732                                 xsum += ntohs(sumdata);
1733                                 sumlen -= 2;
1734                         }
1735                         if (sumlen > 0) {
1736                                 ushort sumdata;
1737
1738                                 sumdata = *(unsigned char *) sumptr;
1739                                 sumdata = (sumdata << 8) & 0xff00;
1740                                 xsum += sumdata;
1741                         }
1742                         while ((xsum >> 16) != 0) {
1743                                 xsum = (xsum & 0x0000ffff) +
1744                                        ((xsum >> 16) & 0x0000ffff);
1745                         }
1746                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1747                                 printf(" UDP wrong checksum %08lx %08x\n",
1748                                         xsum, ntohs(ip->udp_xsum));
1749                                 return;
1750                         }
1751                 }
1752 #endif
1753
1754
1755 #ifdef CONFIG_NETCONSOLE
1756                 nc_input_packet((uchar *)ip + IP_HDR_SIZE,
1757                                                 ntohs(ip->udp_dst),
1758                                                 ntohs(ip->udp_src),
1759                                                 ntohs(ip->udp_len) - 8);
1760 #endif
1761                 /*
1762                  *      IP header OK.  Pass the packet to the current handler.
1763                  */
1764                 (*packetHandler)((uchar *)ip + IP_HDR_SIZE,
1765                                                 ntohs(ip->udp_dst),
1766                                                 src_ip,
1767                                                 ntohs(ip->udp_src),
1768                                                 ntohs(ip->udp_len) - 8);
1769                 break;
1770         }
1771 }
1772
1773
1774 /**********************************************************************/
1775
1776 static int net_check_prereq(enum proto_t protocol)
1777 {
1778         switch (protocol) {
1779                 /* Fall through */
1780 #if defined(CONFIG_CMD_PING)
1781         case PING:
1782                 if (NetPingIP == 0) {
1783                         puts("*** ERROR: ping address not given\n");
1784                         return 1;
1785                 }
1786                 goto common;
1787 #endif
1788 #if defined(CONFIG_CMD_SNTP)
1789         case SNTP:
1790                 if (NetNtpServerIP == 0) {
1791                         puts("*** ERROR: NTP server address not given\n");
1792                         return 1;
1793                 }
1794                 goto common;
1795 #endif
1796 #if defined(CONFIG_CMD_DNS)
1797         case DNS:
1798                 if (NetOurDNSIP == 0) {
1799                         puts("*** ERROR: DNS server address not given\n");
1800                         return 1;
1801                 }
1802                 goto common;
1803 #endif
1804 #if defined(CONFIG_CMD_NFS)
1805         case NFS:
1806 #endif
1807         case TFTPGET:
1808         case TFTPPUT:
1809                 if (NetServerIP == 0) {
1810                         puts("*** ERROR: `serverip' not set\n");
1811                         return 1;
1812                 }
1813 #if     defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
1814         defined(CONFIG_CMD_DNS)
1815 common:
1816 #endif
1817                 /* Fall through */
1818
1819         case NETCONS:
1820         case TFTPSRV:
1821                 if (NetOurIP == 0) {
1822                         puts("*** ERROR: `ipaddr' not set\n");
1823                         return 1;
1824                 }
1825                 /* Fall through */
1826
1827 #ifdef CONFIG_CMD_RARP
1828         case RARP:
1829 #endif
1830         case BOOTP:
1831         case CDP:
1832         case DHCP:
1833                 if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
1834                         extern int eth_get_dev_index(void);
1835                         int num = eth_get_dev_index();
1836
1837                         switch (num) {
1838                         case -1:
1839                                 puts("*** ERROR: No ethernet found.\n");
1840                                 return 1;
1841                         case 0:
1842                                 puts("*** ERROR: `ethaddr' not set\n");
1843                                 break;
1844                         default:
1845                                 printf("*** ERROR: `eth%daddr' not set\n",
1846                                         num);
1847                                 break;
1848                         }
1849
1850                         NetStartAgain();
1851                         return 2;
1852                 }
1853                 /* Fall through */
1854         default:
1855                 return 0;
1856         }
1857         return 0;               /* OK */
1858 }
1859 /**********************************************************************/
1860
1861 int
1862 NetCksumOk(uchar *ptr, int len)
1863 {
1864         return !((NetCksum(ptr, len) + 1) & 0xfffe);
1865 }
1866
1867
1868 unsigned
1869 NetCksum(uchar *ptr, int len)
1870 {
1871         ulong   xsum;
1872         ushort *p = (ushort *)ptr;
1873
1874         xsum = 0;
1875         while (len-- > 0)
1876                 xsum += *p++;
1877         xsum = (xsum & 0xffff) + (xsum >> 16);
1878         xsum = (xsum & 0xffff) + (xsum >> 16);
1879         return xsum & 0xffff;
1880 }
1881
1882 int
1883 NetEthHdrSize(void)
1884 {
1885         ushort myvlanid;
1886
1887         myvlanid = ntohs(NetOurVLAN);
1888         if (myvlanid == (ushort)-1)
1889                 myvlanid = VLAN_NONE;
1890
1891         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1892                 VLAN_ETHER_HDR_SIZE;
1893 }
1894
1895 int
1896 NetSetEther(volatile uchar *xet, uchar * addr, uint prot)
1897 {
1898         Ethernet_t *et = (Ethernet_t *)xet;
1899         ushort myvlanid;
1900
1901         myvlanid = ntohs(NetOurVLAN);
1902         if (myvlanid == (ushort)-1)
1903                 myvlanid = VLAN_NONE;
1904
1905         memcpy(et->et_dest, addr, 6);
1906         memcpy(et->et_src, NetOurEther, 6);
1907         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1908                 et->et_protlen = htons(prot);
1909                 return ETHER_HDR_SIZE;
1910         } else {
1911                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet;
1912
1913                 vet->vet_vlan_type = htons(PROT_VLAN);
1914                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1915                 vet->vet_type = htons(prot);
1916                 return VLAN_ETHER_HDR_SIZE;
1917         }
1918 }
1919
1920 void
1921 NetSetIP(volatile uchar *xip, IPaddr_t dest, int dport, int sport, int len)
1922 {
1923         IP_t *ip = (IP_t *)xip;
1924
1925         /*
1926          *      If the data is an odd number of bytes, zero the
1927          *      byte after the last byte so that the checksum
1928          *      will work.
1929          */
1930         if (len & 1)
1931                 xip[IP_HDR_SIZE + len] = 0;
1932
1933         /*
1934          *      Construct an IP and UDP header.
1935          *      (need to set no fragment bit - XXX)
1936          */
1937         /* IP_HDR_SIZE / 4 (not including UDP) */
1938         ip->ip_hl_v  = 0x45;
1939         ip->ip_tos   = 0;
1940         ip->ip_len   = htons(IP_HDR_SIZE + len);
1941         ip->ip_id    = htons(NetIPID++);
1942         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1943         ip->ip_ttl   = 255;
1944         ip->ip_p     = 17;              /* UDP */
1945         ip->ip_sum   = 0;
1946         /* already in network byte order */
1947         NetCopyIP((void *)&ip->ip_src, &NetOurIP);
1948         /* - "" - */
1949         NetCopyIP((void *)&ip->ip_dst, &dest);
1950         ip->udp_src  = htons(sport);
1951         ip->udp_dst  = htons(dport);
1952         ip->udp_len  = htons(8 + len);
1953         ip->udp_xsum = 0;
1954         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
1955 }
1956
1957 void copy_filename(char *dst, const char *src, int size)
1958 {
1959         if (*src && (*src == '"')) {
1960                 ++src;
1961                 --size;
1962         }
1963
1964         while ((--size > 0) && *src && (*src != '"'))
1965                 *dst++ = *src++;
1966         *dst = '\0';
1967 }
1968
1969 #if     defined(CONFIG_CMD_NFS)         || \
1970         defined(CONFIG_CMD_SNTP)        || \
1971         defined(CONFIG_CMD_DNS)
1972 /*
1973  * make port a little random (1024-17407)
1974  * This keeps the math somewhat trivial to compute, and seems to work with
1975  * all supported protocols/clients/servers
1976  */
1977 unsigned int random_port(void)
1978 {
1979         return 1024 + (get_timer(0) % 0x4000);
1980 }
1981 #endif
1982
1983 void ip_to_string(IPaddr_t x, char *s)
1984 {
1985         x = ntohl(x);
1986         sprintf(s, "%d.%d.%d.%d",
1987                 (int) ((x >> 24) & 0xff),
1988                 (int) ((x >> 16) & 0xff),
1989                 (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
1990         );
1991 }
1992
1993 void VLAN_to_string(ushort x, char *s)
1994 {
1995         x = ntohs(x);
1996
1997         if (x == (ushort)-1)
1998                 x = VLAN_NONE;
1999
2000         if (x == VLAN_NONE)
2001                 strcpy(s, "none");
2002         else
2003                 sprintf(s, "%d", x & VLAN_IDMASK);
2004 }
2005
2006 ushort string_to_VLAN(const char *s)
2007 {
2008         ushort id;
2009
2010         if (s == NULL)
2011                 return htons(VLAN_NONE);
2012
2013         if (*s < '0' || *s > '9')
2014                 id = VLAN_NONE;
2015         else
2016                 id = (ushort)simple_strtoul(s, NULL, 10);
2017
2018         return htons(id);
2019 }
2020
2021 ushort getenv_VLAN(char *var)
2022 {
2023         return string_to_VLAN(getenv(var));
2024 }