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 <linux/compiler.h>
  81 #include <net.h>
  82 #include "bootp.h"
  83 #include "tftp.h"
  84 #ifdef CONFIG_CMD_RARP
  85 #include "rarp.h"
  86 #endif
  87 #include "nfs.h"
  88 #ifdef CONFIG_STATUS_LED
  89 #include <status_led.h>
  90 #include <miiphy.h>
  91 #endif
  92 #if defined(CONFIG_CMD_SNTP)
  93 #include "sntp.h"
  94 #endif
  95 #if defined(CONFIG_CDP_VERSION)
  96 #include <timestamp.h>
  97 #endif
  98 #if defined(CONFIG_CMD_DNS)
  99 #include "dns.h"
 100 #endif
 101
 102 DECLARE_GLOBAL_DATA_PTR;
 103
 104 #ifndef CONFIG_ARP_TIMEOUT
 105 /* Milliseconds before trying ARP again */
 106 # define ARP_TIMEOUT            5000UL
 107 #else
 108 # define ARP_TIMEOUT            CONFIG_ARP_TIMEOUT
 109 #endif
 110
 111
 112 #ifndef CONFIG_NET_RETRY_COUNT
 113 # define ARP_TIMEOUT_COUNT      5       /* # of timeouts before giving up  */
 114 #else
 115 # define ARP_TIMEOUT_COUNT      CONFIG_NET_RETRY_COUNT
 116 #endif
 117
 118 /** BOOTP EXTENTIONS **/
 119
 120 /* Our subnet mask (0=unknown) */
 121 IPaddr_t        NetOurSubnetMask;
 122 /* Our gateways IP address */
 123 IPaddr_t        NetOurGatewayIP;
 124 /* Our DNS IP address */
 125 IPaddr_t        NetOurDNSIP;
 126 #if defined(CONFIG_BOOTP_DNS2)
 127 /* Our 2nd DNS IP address */
 128 IPaddr_t        NetOurDNS2IP;
 129 #endif
 130 /* Our NIS domain */
 131 char            NetOurNISDomain[32] = {0,};
 132 /* Our hostname */
 133 char            NetOurHostName[32] = {0,};
 134 /* Our bootpath */
 135 char            NetOurRootPath[64] = {0,};
 136 /* Our bootfile size in blocks */
 137 ushort          NetBootFileSize;
 138
 139 #ifdef CONFIG_MCAST_TFTP        /* Multicast TFTP */
 140 IPaddr_t Mcast_addr;
 141 #endif
 142
 143 /** END OF BOOTP EXTENTIONS **/
 144
 145 /* The actual transferred size of the bootfile (in bytes) */
 146 ulong           NetBootFileXferSize;
 147 /* Our ethernet address */
 148 uchar           NetOurEther[6];
 149 /* Boot server enet address */
 150 uchar           NetServerEther[6];
 151 /* Our IP addr (0 = unknown) */
 152 IPaddr_t        NetOurIP;
 153 /* Server IP addr (0 = unknown) */
 154 IPaddr_t        NetServerIP;
 155 /* Current receive packet */
 156 uchar *NetRxPacket;
 157 /* Current rx packet length */
 158 int             NetRxPacketLen;
 159 /* IP packet ID */
 160 unsigned        NetIPID;
 161 /* Ethernet bcast address */
 162 uchar           NetBcastAddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 163 uchar           NetEtherNullAddr[6];
 164 #ifdef CONFIG_API
 165 void            (*push_packet)(void *, int len) = 0;
 166 #endif
 167 #if defined(CONFIG_CMD_CDP)
 168 /* Ethernet bcast address */
 169 uchar           NetCDPAddr[6] = { 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc };
 170 #endif
 171 /* Network loop state */
 172 int             NetState;
 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
 180 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
 181 /* default is without VLAN */
 182 ushort          NetOurVLAN = 0xFFFF;
 183 /* ditto */
 184 ushort          NetOurNativeVLAN = 0xFFFF;
 185
 186 /* Boot File name */
 187 char            BootFile[128];
 188
 189 #if defined(CONFIG_CMD_PING)
 190 /* the ip address to ping */
 191 IPaddr_t        NetPingIP;
 192
 193 static void PingStart(void);
 194 #endif
 195
 196 #if defined(CONFIG_CMD_CDP)
 197 static void CDPStart(void);
 198 #endif
 199
 200 #if defined(CONFIG_CMD_SNTP)
 201 /* NTP server IP address */
 202 IPaddr_t        NetNtpServerIP;
 203 /* offset time from UTC */
 204 int             NetTimeOffset;
 205 #endif
 206
 207 uchar PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 208
 209 /* Receive packet */
 210 uchar *NetRxPackets[PKTBUFSRX];
 211
 212 /* Current RX packet handler */
 213 static rxhand_f *packetHandler;
 214 #ifdef CONFIG_CMD_TFTPPUT
 215 static rxhand_icmp_f *packet_icmp_handler;      /* Current ICMP rx handler */
 216 #endif
 217 /* Current timeout handler */
 218 static thand_f *timeHandler;
 219 /* Time base value */
 220 static ulong    timeStart;
 221 /* Current timeout value */
 222 static ulong    timeDelta;
 223 /* THE transmit packet */
 224 uchar *NetTxPacket;
 225
 226 static int net_check_prereq(enum proto_t protocol);
 227
 228 static int NetTryCount;
 229
 230 /**********************************************************************/
 231
 232 IPaddr_t        NetArpWaitPacketIP;
 233 IPaddr_t        NetArpWaitReplyIP;
 234 /* MAC address of waiting packet's destination */
 235 uchar          *NetArpWaitPacketMAC;
 236 /* THE transmit packet */
 237 uchar          *NetArpWaitTxPacket;
 238 int             NetArpWaitTxPacketSize;
 239 uchar           NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
 240 ulong           NetArpWaitTimerStart;
 241 int             NetArpWaitTry;
 242
 243 void ArpRequest(void)
 244 {
 245         uchar *pkt;
 246         ARP_t *arp;
 247
 248         debug("ARP broadcast %d\n", NetArpWaitTry);
 249
 250         pkt = NetTxPacket;
 251
 252         pkt += NetSetEther(pkt, NetBcastAddr, PROT_ARP);
 253
 254         arp = (ARP_t *) pkt;
 255
 256         arp->ar_hrd = htons(ARP_ETHER);
 257         arp->ar_pro = htons(PROT_IP);
 258         arp->ar_hln = 6;
 259         arp->ar_pln = 4;
 260         arp->ar_op = htons(ARPOP_REQUEST);
 261
 262         /* source ET addr */
 263         memcpy(&arp->ar_data[0], NetOurEther, 6);
 264         /* source IP addr */
 265         NetWriteIP((uchar *) &arp->ar_data[6], NetOurIP);
 266         /* dest ET addr = 0 */
 267         memset(&arp->ar_data[10], '\0', 6);
 268         if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
 269             (NetOurIP & NetOurSubnetMask)) {
 270                 if (NetOurGatewayIP == 0) {
 271                         puts("## Warning: gatewayip needed but not set\n");
 272                         NetArpWaitReplyIP = NetArpWaitPacketIP;
 273                 } else {
 274                         NetArpWaitReplyIP = NetOurGatewayIP;
 275                 }
 276         } else {
 277                 NetArpWaitReplyIP = NetArpWaitPacketIP;
 278         }
 279
 280         NetWriteIP((uchar *) &arp->ar_data[16], NetArpWaitReplyIP);
 281         (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
 282 }
 283
 284 void ArpTimeoutCheck(void)
 285 {
 286         ulong t;
 287
 288         if (!NetArpWaitPacketIP)
 289                 return;
 290
 291         t = get_timer(0);
 292
 293         /* check for arp timeout */
 294         if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT) {
 295                 NetArpWaitTry++;
 296
 297                 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
 298                         puts("\nARP Retry count exceeded; starting again\n");
 299                         NetArpWaitTry = 0;
 300                         NetStartAgain();
 301                 } else {
 302                         NetArpWaitTimerStart = t;
 303                         ArpRequest();
 304                 }
 305         }
 306 }
 307
 308 /*
 309  * Check if autoload is enabled. If so, use either NFS or TFTP to download
 310  * the boot file.
 311  */
 312 void net_auto_load(void)
 313 {
 314         const char *s = getenv("autoload");
 315
 316         if (s != NULL) {
 317                 if (*s == 'n') {
 318                         /*
 319                          * Just use BOOTP/RARP to configure system;
 320                          * Do not use TFTP to load the bootfile.
 321                          */
 322                         NetState = NETLOOP_SUCCESS;
 323                         return;
 324                 }
 325 #if defined(CONFIG_CMD_NFS)
 326                 if (strcmp(s, "NFS") == 0) {
 327                         /*
 328                          * Use NFS to load the bootfile.
 329                          */
 330                         NfsStart();
 331                         return;
 332                 }
 333 #endif
 334         }
 335         TftpStart(TFTPGET);
 336 }
 337
 338 static void NetInitLoop(enum proto_t protocol)
 339 {
 340         static int env_changed_id;
 341         int env_id = get_env_id();
 342
 343         /* update only when the environment has changed */
 344         if (env_changed_id != env_id) {
 345                 NetOurIP = getenv_IPaddr("ipaddr");
 346                 NetOurGatewayIP = getenv_IPaddr("gatewayip");
 347                 NetOurSubnetMask = getenv_IPaddr("netmask");
 348                 NetServerIP = getenv_IPaddr("serverip");
 349                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 350                 NetOurVLAN = getenv_VLAN("vlan");
 351 #if defined(CONFIG_CMD_DNS)
 352                 NetOurDNSIP = getenv_IPaddr("dnsip");
 353 #endif
 354                 env_changed_id = env_id;
 355         }
 356
 357         return;
 358 }
 359
 360 /**********************************************************************/
 361 /*
 362  *      Main network processing loop.
 363  */
 364
 365 int NetLoop(enum proto_t protocol)
 366 {
 367         bd_t *bd = gd->bd;
 368         int ret = -1;
 369
 370         NetRestarted = 0;
 371         NetDevExists = 0;
 372
 373         /* XXX problem with bss workaround */
 374         NetArpWaitPacketMAC = NULL;
 375         NetArpWaitTxPacket = NULL;
 376         NetArpWaitPacketIP = 0;
 377         NetArpWaitReplyIP = 0;
 378         NetArpWaitTxPacket = NULL;
 379         NetTxPacket = NULL;
 380         NetTryCount = 1;
 381
 382         if (!NetTxPacket) {
 383                 int     i;
 384                 /*
 385                  *      Setup packet buffers, aligned correctly.
 386                  */
 387                 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
 388                 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
 389                 for (i = 0; i < PKTBUFSRX; i++)
 390                         NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
 391         }
 392
 393         if (!NetArpWaitTxPacket) {
 394                 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
 395                 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
 396                 NetArpWaitTxPacketSize = 0;
 397         }
 398
 399         bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
 400         eth_halt();
 401         eth_set_current();
 402         if (eth_init(bd) < 0) {
 403                 eth_halt();
 404                 return -1;
 405         }
 406
 407 restart:
 408         memcpy(NetOurEther, eth_get_dev()->enetaddr, 6);
 409
 410         NetState = NETLOOP_CONTINUE;
 411
 412         /*
 413          *      Start the ball rolling with the given start function.  From
 414          *      here on, this code is a state machine driven by received
 415          *      packets and timer events.
 416          */
 417         NetInitLoop(protocol);
 418
 419         switch (net_check_prereq(protocol)) {
 420         case 1:
 421                 /* network not configured */
 422                 eth_halt();
 423                 return -1;
 424
 425         case 2:
 426                 /* network device not configured */
 427                 break;
 428
 429         case 0:
 430                 NetDevExists = 1;
 431                 NetBootFileXferSize = 0;
 432                 switch (protocol) {
 433                 case TFTPGET:
 434 #ifdef CONFIG_CMD_TFTPPUT
 435                 case TFTPPUT:
 436 #endif
 437                         /* always use ARP to get server ethernet address */
 438                         TftpStart(protocol);
 439                         break;
 440 #ifdef CONFIG_CMD_TFTPSRV
 441                 case TFTPSRV:
 442                         TftpStartServer();
 443                         break;
 444 #endif
 445 #if defined(CONFIG_CMD_DHCP)
 446                 case DHCP:
 447                         BootpTry = 0;
 448                         NetOurIP = 0;
 449                         DhcpRequest();          /* Basically same as BOOTP */
 450                         break;
 451 #endif
 452
 453                 case BOOTP:
 454                         BootpTry = 0;
 455                         NetOurIP = 0;
 456                         BootpRequest();
 457                         break;
 458
 459 #if defined(CONFIG_CMD_RARP)
 460                 case RARP:
 461                         RarpTry = 0;
 462                         NetOurIP = 0;
 463                         RarpRequest();
 464                         break;
 465 #endif
 466 #if defined(CONFIG_CMD_PING)
 467                 case PING:
 468                         PingStart();
 469                         break;
 470 #endif
 471 #if defined(CONFIG_CMD_NFS)
 472                 case NFS:
 473                         NfsStart();
 474                         break;
 475 #endif
 476 #if defined(CONFIG_CMD_CDP)
 477                 case CDP:
 478                         CDPStart();
 479                         break;
 480 #endif
 481 #ifdef CONFIG_NETCONSOLE
 482                 case NETCONS:
 483                         NcStart();
 484                         break;
 485 #endif
 486 #if defined(CONFIG_CMD_SNTP)
 487                 case SNTP:
 488                         SntpStart();
 489                         break;
 490 #endif
 491 #if defined(CONFIG_CMD_DNS)
 492                 case DNS:
 493                         DnsStart();
 494                         break;
 495 #endif
 496                 default:
 497                         break;
 498                 }
 499
 500                 break;
 501         }
 502
 503 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 504 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 505         defined(CONFIG_STATUS_LED)                      && \
 506         defined(STATUS_LED_RED)
 507         /*
 508          * Echo the inverted link state to the fault LED.
 509          */
 510         if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
 511                 status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
 512         else
 513                 status_led_set(STATUS_LED_RED, STATUS_LED_ON);
 514 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 515 #endif /* CONFIG_MII, ... */
 516
 517         /*
 518          *      Main packet reception loop.  Loop receiving packets until
 519          *      someone sets `NetState' to a state that terminates.
 520          */
 521         for (;;) {
 522                 WATCHDOG_RESET();
 523 #ifdef CONFIG_SHOW_ACTIVITY
 524                 show_activity(1);
 525 #endif
 526                 /*
 527                  *      Check the ethernet for a new packet.  The ethernet
 528                  *      receive routine will process it.
 529                  */
 530                 eth_rx();
 531
 532                 /*
 533                  *      Abort if ctrl-c was pressed.
 534                  */
 535                 if (ctrlc()) {
 536                         eth_halt();
 537                         puts("\nAbort\n");
 538                         goto done;
 539                 }
 540
 541                 ArpTimeoutCheck();
 542
 543                 /*
 544                  *      Check for a timeout, and run the timeout handler
 545                  *      if we have one.
 546                  */
 547                 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
 548                         thand_f *x;
 549
 550 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 551 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 552         defined(CONFIG_STATUS_LED)                      && \
 553         defined(STATUS_LED_RED)
 554                         /*
 555                          * Echo the inverted link state to the fault LED.
 556                          */
 557                         if (miiphy_link(eth_get_dev()->name,
 558                                        CONFIG_SYS_FAULT_MII_ADDR)) {
 559                                 status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
 560                         } else {
 561                                 status_led_set(STATUS_LED_RED, STATUS_LED_ON);
 562                         }
 563 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 564 #endif /* CONFIG_MII, ... */
 565                         x = timeHandler;
 566                         timeHandler = (thand_f *)0;
 567                         (*x)();
 568                 }
 569
 570
 571                 switch (NetState) {
 572
 573                 case NETLOOP_RESTART:
 574                         NetRestarted = 1;
 575                         goto restart;
 576
 577                 case NETLOOP_SUCCESS:
 578                         if (NetBootFileXferSize > 0) {
 579                                 char buf[20];
 580                                 printf("Bytes transferred = %ld (%lx hex)\n",
 581                                         NetBootFileXferSize,
 582                                         NetBootFileXferSize);
 583                                 sprintf(buf, "%lX", NetBootFileXferSize);
 584                                 setenv("filesize", buf);
 585
 586                                 sprintf(buf, "%lX", (unsigned long)load_addr);
 587                                 setenv("fileaddr", buf);
 588                         }
 589                         eth_halt();
 590                         ret = NetBootFileXferSize;
 591                         goto done;
 592
 593                 case NETLOOP_FAIL:
 594                         goto done;
 595                 }
 596         }
 597
 598 done:
 599 #ifdef CONFIG_CMD_TFTPPUT
 600         /* Clear out the handlers */
 601         NetSetHandler(NULL);
 602         net_set_icmp_handler(NULL);
 603 #endif
 604         return ret;
 605 }
 606
 607 /**********************************************************************/
 608
 609 static void
 610 startAgainTimeout(void)
 611 {
 612         NetState = NETLOOP_RESTART;
 613 }
 614
 615 static void
 616 startAgainHandler(uchar *pkt, unsigned dest, IPaddr_t sip,
 617                   unsigned src, unsigned len)
 618 {
 619         /* Totally ignore the packet */
 620 }
 621
 622 void NetStartAgain(void)
 623 {
 624         char *nretry;
 625         int retry_forever = 0;
 626         unsigned long retrycnt = 0;
 627
 628         nretry = getenv("netretry");
 629         if (nretry) {
 630                 if (!strcmp(nretry, "yes"))
 631                         retry_forever = 1;
 632                 else if (!strcmp(nretry, "no"))
 633                         retrycnt = 0;
 634                 else if (!strcmp(nretry, "once"))
 635                         retrycnt = 1;
 636                 else
 637                         retrycnt = simple_strtoul(nretry, NULL, 0);
 638         } else
 639                 retry_forever = 1;
 640
 641         if ((!retry_forever) && (NetTryCount >= retrycnt)) {
 642                 eth_halt();
 643                 NetState = NETLOOP_FAIL;
 644                 return;
 645         }
 646
 647         NetTryCount++;
 648
 649         eth_halt();
 650 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
 651         eth_try_another(!NetRestarted);
 652 #endif
 653         eth_init(gd->bd);
 654         if (NetRestartWrap) {
 655                 NetRestartWrap = 0;
 656                 if (NetDevExists) {
 657                         NetSetTimeout(10000UL, startAgainTimeout);
 658                         NetSetHandler(startAgainHandler);
 659                 } else {
 660                         NetState = NETLOOP_FAIL;
 661                 }
 662         } else {
 663                 NetState = NETLOOP_RESTART;
 664         }
 665 }
 666
 667 /**********************************************************************/
 668 /*
 669  *      Miscelaneous bits.
 670  */
 671
 672 void
 673 NetSetHandler(rxhand_f *f)
 674 {
 675         packetHandler = f;
 676 }
 677
 678 #ifdef CONFIG_CMD_TFTPPUT
 679 void net_set_icmp_handler(rxhand_icmp_f *f)
 680 {
 681         packet_icmp_handler = f;
 682 }
 683 #endif
 684
 685 void
 686 NetSetTimeout(ulong iv, thand_f *f)
 687 {
 688         if (iv == 0) {
 689                 timeHandler = (thand_f *)0;
 690         } else {
 691                 timeHandler = f;
 692                 timeStart = get_timer(0);
 693                 timeDelta = iv;
 694         }
 695 }
 696
 697
 698 void
 699 NetSendPacket(uchar *pkt, int len)
 700 {
 701         (void) eth_send(pkt, len);
 702 }
 703
 704 int
 705 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
 706 {
 707         uchar *pkt;
 708
 709         /* convert to new style broadcast */
 710         if (dest == 0)
 711                 dest = 0xFFFFFFFF;
 712
 713         /* if broadcast, make the ether address a broadcast and don't do ARP */
 714         if (dest == 0xFFFFFFFF)
 715                 ether = NetBcastAddr;
 716
 717         /*
 718          * if MAC address was not discovered yet, save the packet and do
 719          * an ARP request
 720          */
 721         if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
 722
 723                 debug("sending ARP for %08x\n", dest);
 724
 725                 NetArpWaitPacketIP = dest;
 726                 NetArpWaitPacketMAC = ether;
 727
 728                 pkt = NetArpWaitTxPacket;
 729                 pkt += NetSetEther(pkt, NetArpWaitPacketMAC, PROT_IP);
 730
 731                 NetSetIP(pkt, dest, dport, sport, len);
 732                 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket +
 733                        (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len);
 734
 735                 /* size of the waiting packet */
 736                 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) +
 737                         IP_HDR_SIZE + len;
 738
 739                 /* and do the ARP request */
 740                 NetArpWaitTry = 1;
 741                 NetArpWaitTimerStart = get_timer(0);
 742                 ArpRequest();
 743                 return 1;       /* waiting */
 744         }
 745
 746         debug("sending UDP to %08x/%pM\n", dest, ether);
 747
 748         pkt = (uchar *)NetTxPacket;
 749         pkt += NetSetEther(pkt, ether, PROT_IP);
 750         NetSetIP(pkt, dest, dport, sport, len);
 751         (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len);
 752
 753         return 0;       /* transmitted */
 754 }
 755
 756 #if defined(CONFIG_CMD_PING)
 757 static ushort PingSeqNo;
 758
 759 int PingSend(void)
 760 {
 761         static uchar mac[6];
 762         IP_t *ip;
 763         ushort *s;
 764         uchar *pkt;
 765
 766         /* XXX always send arp request */
 767
 768         memcpy(mac, NetEtherNullAddr, 6);
 769
 770         debug("sending ARP for %08x\n", NetPingIP);
 771
 772         NetArpWaitPacketIP = NetPingIP;
 773         NetArpWaitPacketMAC = mac;
 774
 775         pkt = NetArpWaitTxPacket;
 776         pkt += NetSetEther(pkt, mac, PROT_IP);
 777
 778         ip = (IP_t *)pkt;
 779
 780         /*
 781          * Construct an IP and ICMP header.
 782          * (need to set no fragment bit - XXX)
 783          */
 784         /* IP_HDR_SIZE / 4 (not including UDP) */
 785         ip->ip_hl_v  = 0x45;
 786         ip->ip_tos   = 0;
 787         ip->ip_len   = htons(IP_HDR_SIZE_NO_UDP + 8);
 788         ip->ip_id    = htons(NetIPID++);
 789         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
 790         ip->ip_ttl   = 255;
 791         ip->ip_p     = 0x01;            /* ICMP */
 792         ip->ip_sum   = 0;
 793         /* already in network byte order */
 794         NetCopyIP((void *)&ip->ip_src, &NetOurIP);
 795         /* - "" - */
 796         NetCopyIP((void *)&ip->ip_dst, &NetPingIP);
 797         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
 798
 799         s = &ip->udp_src;               /* XXX ICMP starts here */
 800         s[0] = htons(0x0800);           /* echo-request, code */
 801         s[1] = 0;                       /* checksum */
 802         s[2] = 0;                       /* identifier */
 803         s[3] = htons(PingSeqNo++);      /* sequence number */
 804         s[1] = ~NetCksum((uchar *)s, 8/2);
 805
 806         /* size of the waiting packet */
 807         NetArpWaitTxPacketSize =
 808                 (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8;
 809
 810         /* and do the ARP request */
 811         NetArpWaitTry = 1;
 812         NetArpWaitTimerStart = get_timer(0);
 813         ArpRequest();
 814         return 1;       /* waiting */
 815 }
 816
 817 static void
 818 PingTimeout(void)
 819 {
 820         eth_halt();
 821         NetState = NETLOOP_FAIL;        /* we did not get the reply */
 822 }
 823
 824 static void
 825 PingHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
 826             unsigned len)
 827 {
 828         if (sip != NetPingIP)
 829                 return;
 830
 831         NetState = NETLOOP_SUCCESS;
 832 }
 833
 834 static void PingStart(void)
 835 {
 836         printf("Using %s device\n", eth_get_name());
 837         NetSetTimeout(10000UL, PingTimeout);
 838         NetSetHandler(PingHandler);
 839
 840         PingSend();
 841 }
 842 #endif
 843
 844 #if defined(CONFIG_CMD_CDP)
 845
 846 #define CDP_DEVICE_ID_TLV               0x0001
 847 #define CDP_ADDRESS_TLV                 0x0002
 848 #define CDP_PORT_ID_TLV                 0x0003
 849 #define CDP_CAPABILITIES_TLV            0x0004
 850 #define CDP_VERSION_TLV                 0x0005
 851 #define CDP_PLATFORM_TLV                0x0006
 852 #define CDP_NATIVE_VLAN_TLV             0x000a
 853 #define CDP_APPLIANCE_VLAN_TLV          0x000e
 854 #define CDP_TRIGGER_TLV                 0x000f
 855 #define CDP_POWER_CONSUMPTION_TLV       0x0010
 856 #define CDP_SYSNAME_TLV                 0x0014
 857 #define CDP_SYSOBJECT_TLV               0x0015
 858 #define CDP_MANAGEMENT_ADDRESS_TLV      0x0016
 859
 860 #define CDP_TIMEOUT                     250UL   /* one packet every 250ms */
 861
 862 static int CDPSeq;
 863 static int CDPOK;
 864
 865 ushort CDPNativeVLAN;
 866 ushort CDPApplianceVLAN;
 867
 868 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20,
 869                                        0x00 };
 870
 871 static ushort CDP_compute_csum(const uchar *buff, ushort len)
 872 {
 873         ushort csum;
 874         int     odd;
 875         ulong   result = 0;
 876         ushort  leftover;
 877         ushort *p;
 878
 879         if (len > 0) {
 880                 odd = 1 & (ulong)buff;
 881                 if (odd) {
 882                         result = *buff << 8;
 883                         len--;
 884                         buff++;
 885                 }
 886                 while (len > 1) {
 887                         p = (ushort *)buff;
 888                         result += *p++;
 889                         buff = (uchar *)p;
 890                         if (result & 0x80000000)
 891                                 result = (result & 0xFFFF) + (result >> 16);
 892                         len -= 2;
 893                 }
 894                 if (len) {
 895                         leftover = (signed short)(*(const signed char *)buff);
 896                         /* CISCO SUCKS big time! (and blows too):
 897                          * CDP uses the IP checksum algorithm with a twist;
 898                          * for the last byte it *sign* extends and sums.
 899                          */
 900                         result = (result & 0xffff0000) |
 901                                  ((result + leftover) & 0x0000ffff);
 902                 }
 903                 while (result >> 16)
 904                         result = (result & 0xFFFF) + (result >> 16);
 905
 906                 if (odd)
 907                         result = ((result >> 8) & 0xff) |
 908                                  ((result & 0xff) << 8);
 909         }
 910
 911         /* add up 16-bit and 17-bit words for 17+c bits */
 912         result = (result & 0xffff) + (result >> 16);
 913         /* add up 16-bit and 2-bit for 16+c bit */
 914         result = (result & 0xffff) + (result >> 16);
 915         /* add up carry.. */
 916         result = (result & 0xffff) + (result >> 16);
 917
 918         /* negate */
 919         csum = ~(ushort)result;
 920
 921         /* run time endian detection */
 922         if (csum != htons(csum))        /* little endian */
 923                 csum = htons(csum);
 924
 925         return csum;
 926 }
 927
 928 int CDPSendTrigger(void)
 929 {
 930         uchar *pkt;
 931         ushort *s;
 932         ushort *cp;
 933         Ethernet_t *et;
 934         int len;
 935         ushort chksum;
 936 #if     defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID)   || \
 937         defined(CONFIG_CDP_VERSION)   || defined(CONFIG_CDP_PLATFORM)
 938         char buf[32];
 939 #endif
 940
 941         pkt = NetTxPacket;
 942         et = (Ethernet_t *)pkt;
 943
 944         /* NOTE: trigger sent not on any VLAN */
 945
 946         /* form ethernet header */
 947         memcpy(et->et_dest, NetCDPAddr, 6);
 948         memcpy(et->et_src, NetOurEther, 6);
 949
 950         pkt += ETHER_HDR_SIZE;
 951
 952         /* SNAP header */
 953         memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr));
 954         pkt += sizeof(CDP_SNAP_hdr);
 955
 956         /* CDP header */
 957         *pkt++ = 0x02;                          /* CDP version 2 */
 958         *pkt++ = 180;                           /* TTL */
 959         s = (ushort *)pkt;
 960         cp = s;
 961         /* checksum (0 for later calculation) */
 962         *s++ = htons(0);
 963
 964         /* CDP fields */
 965 #ifdef CONFIG_CDP_DEVICE_ID
 966         *s++ = htons(CDP_DEVICE_ID_TLV);
 967         *s++ = htons(CONFIG_CDP_DEVICE_ID);
 968         sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%pm", NetOurEther);
 969         memcpy((uchar *)s, buf, 16);
 970         s += 16 / 2;
 971 #endif
 972
 973 #ifdef CONFIG_CDP_PORT_ID
 974         *s++ = htons(CDP_PORT_ID_TLV);
 975         memset(buf, 0, sizeof(buf));
 976         sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index());
 977         len = strlen(buf);
 978         if (len & 1)    /* make it even */
 979                 len++;
 980         *s++ = htons(len + 4);
 981         memcpy((uchar *)s, buf, len);
 982         s += len / 2;
 983 #endif
 984
 985 #ifdef CONFIG_CDP_CAPABILITIES
 986         *s++ = htons(CDP_CAPABILITIES_TLV);
 987         *s++ = htons(8);
 988         *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES);
 989         s += 2;
 990 #endif
 991
 992 #ifdef CONFIG_CDP_VERSION
 993         *s++ = htons(CDP_VERSION_TLV);
 994         memset(buf, 0, sizeof(buf));
 995         strcpy(buf, CONFIG_CDP_VERSION);
 996         len = strlen(buf);
 997         if (len & 1)    /* make it even */
 998                 len++;
 999         *s++ = htons(len + 4);
1000         memcpy((uchar *)s, buf, len);
1001         s += len / 2;
1002 #endif
1003
1004 #ifdef CONFIG_CDP_PLATFORM
1005         *s++ = htons(CDP_PLATFORM_TLV);
1006         memset(buf, 0, sizeof(buf));
1007         strcpy(buf, CONFIG_CDP_PLATFORM);
1008         len = strlen(buf);
1009         if (len & 1)    /* make it even */
1010                 len++;
1011         *s++ = htons(len + 4);
1012         memcpy((uchar *)s, buf, len);
1013         s += len / 2;
1014 #endif
1015
1016 #ifdef CONFIG_CDP_TRIGGER
1017         *s++ = htons(CDP_TRIGGER_TLV);
1018         *s++ = htons(8);
1019         *(ulong *)s = htonl(CONFIG_CDP_TRIGGER);
1020         s += 2;
1021 #endif
1022
1023 #ifdef CONFIG_CDP_POWER_CONSUMPTION
1024         *s++ = htons(CDP_POWER_CONSUMPTION_TLV);
1025         *s++ = htons(6);
1026         *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION);
1027 #endif
1028
1029         /* length of ethernet packet */
1030         len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE);
1031         et->et_protlen = htons(len);
1032
1033         len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr);
1034         chksum = CDP_compute_csum((uchar *)NetTxPacket + len,
1035                                   (uchar *)s - (NetTxPacket + len));
1036         if (chksum == 0)
1037                 chksum = 0xFFFF;
1038         *cp = htons(chksum);
1039
1040         (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket);
1041         return 0;
1042 }
1043
1044 static void
1045 CDPTimeout(void)
1046 {
1047         CDPSeq++;
1048
1049         if (CDPSeq < 3) {
1050                 NetSetTimeout(CDP_TIMEOUT, CDPTimeout);
1051                 CDPSendTrigger();
1052                 return;
1053         }
1054
1055         /* if not OK try again */
1056         if (!CDPOK)
1057                 NetStartAgain();
1058         else
1059                 NetState = NETLOOP_SUCCESS;
1060 }
1061
1062 static void
1063 CDPDummyHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
1064                 unsigned len)
1065 {
1066         /* nothing */
1067 }
1068
1069 static void
1070 CDPHandler(const uchar *pkt, unsigned len)
1071 {
1072         const uchar *t;
1073         const ushort *ss;
1074         ushort type, tlen;
1075         ushort vlan, nvlan;
1076
1077         /* minimum size? */
1078         if (len < sizeof(CDP_SNAP_hdr) + 4)
1079                 goto pkt_short;
1080
1081         /* check for valid CDP SNAP header */
1082         if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0)
1083                 return;
1084
1085         pkt += sizeof(CDP_SNAP_hdr);
1086         len -= sizeof(CDP_SNAP_hdr);
1087
1088         /* Version of CDP protocol must be >= 2 and TTL != 0 */
1089         if (pkt[0] < 0x02 || pkt[1] == 0)
1090                 return;
1091
1092         /*
1093          * if version is greater than 0x02 maybe we'll have a problem;
1094          * output a warning
1095          */
1096         if (pkt[0] != 0x02)
1097                 printf("**WARNING: CDP packet received with a protocol version "
1098                                 "%d > 2\n", pkt[0] & 0xff);
1099
1100         if (CDP_compute_csum(pkt, len) != 0)
1101                 return;
1102
1103         pkt += 4;
1104         len -= 4;
1105
1106         vlan = htons(-1);
1107         nvlan = htons(-1);
1108         while (len > 0) {
1109                 if (len < 4)
1110                         goto pkt_short;
1111
1112                 ss = (const ushort *)pkt;
1113                 type = ntohs(ss[0]);
1114                 tlen = ntohs(ss[1]);
1115                 if (tlen > len)
1116                         goto pkt_short;
1117
1118                 pkt += tlen;
1119                 len -= tlen;
1120
1121                 ss += 2;        /* point ss to the data of the TLV */
1122                 tlen -= 4;
1123
1124                 switch (type) {
1125                 case CDP_DEVICE_ID_TLV:
1126                         break;
1127                 case CDP_ADDRESS_TLV:
1128                         break;
1129                 case CDP_PORT_ID_TLV:
1130                         break;
1131                 case CDP_CAPABILITIES_TLV:
1132                         break;
1133                 case CDP_VERSION_TLV:
1134                         break;
1135                 case CDP_PLATFORM_TLV:
1136                         break;
1137                 case CDP_NATIVE_VLAN_TLV:
1138                         nvlan = *ss;
1139                         break;
1140                 case CDP_APPLIANCE_VLAN_TLV:
1141                         t = (const uchar *)ss;
1142                         while (tlen > 0) {
1143                                 if (tlen < 3)
1144                                         goto pkt_short;
1145
1146                                 ss = (const ushort *)(t + 1);
1147
1148 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE
1149                                 if (t[0] == CONFIG_CDP_APPLIANCE_VLAN_TYPE)
1150                                         vlan = *ss;
1151 #else
1152                                 /* XXX will this work; dunno */
1153                                 vlan = ntohs(*ss);
1154 #endif
1155                                 t += 3; tlen -= 3;
1156                         }
1157                         break;
1158                 case CDP_TRIGGER_TLV:
1159                         break;
1160                 case CDP_POWER_CONSUMPTION_TLV:
1161                         break;
1162                 case CDP_SYSNAME_TLV:
1163                         break;
1164                 case CDP_SYSOBJECT_TLV:
1165                         break;
1166                 case CDP_MANAGEMENT_ADDRESS_TLV:
1167                         break;
1168                 }
1169         }
1170
1171         CDPApplianceVLAN = vlan;
1172         CDPNativeVLAN = nvlan;
1173
1174         CDPOK = 1;
1175         return;
1176
1177  pkt_short:
1178         printf("** CDP packet is too short\n");
1179         return;
1180 }
1181
1182 static void CDPStart(void)
1183 {
1184         printf("Using %s device\n", eth_get_name());
1185         CDPSeq = 0;
1186         CDPOK = 0;
1187
1188         CDPNativeVLAN = htons(-1);
1189         CDPApplianceVLAN = htons(-1);
1190
1191         NetSetTimeout(CDP_TIMEOUT, CDPTimeout);
1192         NetSetHandler(CDPDummyHandler);
1193
1194         CDPSendTrigger();
1195 }
1196 #endif
1197
1198 #ifdef CONFIG_IP_DEFRAG
1199 /*
1200  * This function collects fragments in a single packet, according
1201  * to the algorithm in RFC815. It returns NULL or the pointer to
1202  * a complete packet, in static storage
1203  */
1204 #ifndef CONFIG_NET_MAXDEFRAG
1205 #define CONFIG_NET_MAXDEFRAG 16384
1206 #endif
1207 /*
1208  * MAXDEFRAG, above, is chosen in the config file and  is real data
1209  * so we need to add the NFS overhead, which is more than TFTP.
1210  * To use sizeof in the internal unnamed structures, we need a real
1211  * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately).
1212  * The compiler doesn't complain nor allocates the actual structure
1213  */
1214 static struct rpc_t rpc_specimen;
1215 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply))
1216
1217 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE_NO_UDP)
1218
1219 /*
1220  * this is the packet being assembled, either data or frag control.
1221  * Fragments go by 8 bytes, so this union must be 8 bytes long
1222  */
1223 struct hole {
1224         /* first_byte is address of this structure */
1225         u16 last_byte;  /* last byte in this hole + 1 (begin of next hole) */
1226         u16 next_hole;  /* index of next (in 8-b blocks), 0 == none */
1227         u16 prev_hole;  /* index of prev, 0 == none */
1228         u16 unused;
1229 };
1230
1231 static IP_t *__NetDefragment(IP_t *ip, int *lenp)
1232 {
1233         static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
1234         static u16 first_hole, total_len;
1235         struct hole *payload, *thisfrag, *h, *newh;
1236         IP_t *localip = (IP_t *)pkt_buff;
1237         uchar *indata = (uchar *)ip;
1238         int offset8, start, len, done = 0;
1239         u16 ip_off = ntohs(ip->ip_off);
1240
1241         /* payload starts after IP header, this fragment is in there */
1242         payload = (struct hole *)(pkt_buff + IP_HDR_SIZE_NO_UDP);
1243         offset8 =  (ip_off & IP_OFFS);
1244         thisfrag = payload + offset8;
1245         start = offset8 * 8;
1246         len = ntohs(ip->ip_len) - IP_HDR_SIZE_NO_UDP;
1247
1248         if (start + len > IP_MAXUDP) /* fragment extends too far */
1249                 return NULL;
1250
1251         if (!total_len || localip->ip_id != ip->ip_id) {
1252                 /* new (or different) packet, reset structs */
1253                 total_len = 0xffff;
1254                 payload[0].last_byte = ~0;
1255                 payload[0].next_hole = 0;
1256                 payload[0].prev_hole = 0;
1257                 first_hole = 0;
1258                 /* any IP header will work, copy the first we received */
1259                 memcpy(localip, ip, IP_HDR_SIZE_NO_UDP);
1260         }
1261
1262         /*
1263          * What follows is the reassembly algorithm. We use the payload
1264          * array as a linked list of hole descriptors, as each hole starts
1265          * at a multiple of 8 bytes. However, last byte can be whatever value,
1266          * so it is represented as byte count, not as 8-byte blocks.
1267          */
1268
1269         h = payload + first_hole;
1270         while (h->last_byte < start) {
1271                 if (!h->next_hole) {
1272                         /* no hole that far away */
1273                         return NULL;
1274                 }
1275                 h = payload + h->next_hole;
1276         }
1277
1278         /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
1279         if (offset8 + ((len + 7) / 8) <= h - payload) {
1280                 /* no overlap with holes (dup fragment?) */
1281                 return NULL;
1282         }
1283
1284         if (!(ip_off & IP_FLAGS_MFRAG)) {
1285                 /* no more fragmentss: truncate this (last) hole */
1286                 total_len = start + len;
1287                 h->last_byte = start + len;
1288         }
1289
1290         /*
1291          * There is some overlap: fix the hole list. This code doesn't
1292          * deal with a fragment that overlaps with two different holes
1293          * (thus being a superset of a previously-received fragment).
1294          */
1295
1296         if ((h >= thisfrag) && (h->last_byte <= start + len)) {
1297                 /* complete overlap with hole: remove hole */
1298                 if (!h->prev_hole && !h->next_hole) {
1299                         /* last remaining hole */
1300                         done = 1;
1301                 } else if (!h->prev_hole) {
1302                         /* first hole */
1303                         first_hole = h->next_hole;
1304                         payload[h->next_hole].prev_hole = 0;
1305                 } else if (!h->next_hole) {
1306                         /* last hole */
1307                         payload[h->prev_hole].next_hole = 0;
1308                 } else {
1309                         /* in the middle of the list */
1310                         payload[h->next_hole].prev_hole = h->prev_hole;
1311                         payload[h->prev_hole].next_hole = h->next_hole;
1312                 }
1313
1314         } else if (h->last_byte <= start + len) {
1315                 /* overlaps with final part of the hole: shorten this hole */
1316                 h->last_byte = start;
1317
1318         } else if (h >= thisfrag) {
1319                 /* overlaps with initial part of the hole: move this hole */
1320                 newh = thisfrag + (len / 8);
1321                 *newh = *h;
1322                 h = newh;
1323                 if (h->next_hole)
1324                         payload[h->next_hole].prev_hole = (h - payload);
1325                 if (h->prev_hole)
1326                         payload[h->prev_hole].next_hole = (h - payload);
1327                 else
1328                         first_hole = (h - payload);
1329
1330         } else {
1331                 /* fragment sits in the middle: split the hole */
1332                 newh = thisfrag + (len / 8);
1333                 *newh = *h;
1334                 h->last_byte = start;
1335                 h->next_hole = (newh - payload);
1336                 newh->prev_hole = (h - payload);
1337                 if (newh->next_hole)
1338                         payload[newh->next_hole].prev_hole = (newh - payload);
1339         }
1340
1341         /* finally copy this fragment and possibly return whole packet */
1342         memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE_NO_UDP, len);
1343         if (!done)
1344                 return NULL;
1345
1346         localip->ip_len = htons(total_len);
1347         *lenp = total_len + IP_HDR_SIZE_NO_UDP;
1348         return localip;
1349 }
1350
1351 static inline IP_t *NetDefragment(IP_t *ip, int *lenp)
1352 {
1353         u16 ip_off = ntohs(ip->ip_off);
1354         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1355                 return ip; /* not a fragment */
1356         return __NetDefragment(ip, lenp);
1357 }
1358
1359 #else /* !CONFIG_IP_DEFRAG */
1360
1361 static inline IP_t *NetDefragment(IP_t *ip, int *lenp)
1362 {
1363         u16 ip_off = ntohs(ip->ip_off);
1364         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1365                 return ip; /* not a fragment */
1366         return NULL;
1367 }
1368 #endif
1369
1370 /**
1371  * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
1372  * drop others.
1373  *
1374  * @parma ip    IP packet containing the ICMP
1375  */
1376 static void receive_icmp(IP_t *ip, int len, IPaddr_t src_ip, Ethernet_t *et)
1377 {
1378         ICMP_t *icmph = (ICMP_t *)&ip->udp_src;
1379
1380         switch (icmph->type) {
1381         case ICMP_REDIRECT:
1382                 if (icmph->code != ICMP_REDIR_HOST)
1383                         return;
1384                 printf(" ICMP Host Redirect to %pI4 ",
1385                         &icmph->un.gateway);
1386                 break;
1387 #if defined(CONFIG_CMD_PING)
1388         case ICMP_ECHO_REPLY:
1389                 /*
1390                         * IP header OK.  Pass the packet to the
1391                         * current handler.
1392                         */
1393                 /*
1394                  * XXX point to ip packet - should this use
1395                  * packet_icmp_handler?
1396                  */
1397                 (*packetHandler)((uchar *)ip, 0, src_ip, 0, 0);
1398                 break;
1399         case ICMP_ECHO_REQUEST:
1400                 debug("Got ICMP ECHO REQUEST, return %d bytes\n",
1401                         ETHER_HDR_SIZE + len);
1402
1403                 memcpy(&et->et_dest[0], &et->et_src[0], 6);
1404                 memcpy(&et->et_src[0], NetOurEther, 6);
1405
1406                 ip->ip_sum = 0;
1407                 ip->ip_off = 0;
1408                 NetCopyIP((void *)&ip->ip_dst, &ip->ip_src);
1409                 NetCopyIP((void *)&ip->ip_src, &NetOurIP);
1410                 ip->ip_sum = ~NetCksum((uchar *)ip,
1411                                         IP_HDR_SIZE_NO_UDP >> 1);
1412
1413                 icmph->type = ICMP_ECHO_REPLY;
1414                 icmph->checksum = 0;
1415                 icmph->checksum = ~NetCksum((uchar *)icmph,
1416                         (len - IP_HDR_SIZE_NO_UDP) >> 1);
1417                 (void) eth_send((uchar *)et,
1418                                 ETHER_HDR_SIZE + len);
1419                 break;
1420 #endif
1421         default:
1422 #ifdef CONFIG_CMD_TFTPPUT
1423                 if (packet_icmp_handler)
1424                         packet_icmp_handler(icmph->type, icmph->code,
1425                                 ntohs(ip->udp_dst), src_ip, ntohs(ip->udp_src),
1426                                 icmph->un.data, ntohs(ip->udp_len));
1427 #endif
1428                 break;
1429         }
1430 }
1431
1432 void
1433 NetReceive(uchar *inpkt, int len)
1434 {
1435         Ethernet_t *et;
1436         IP_t    *ip;
1437         ARP_t   *arp;
1438         IPaddr_t tmp;
1439         IPaddr_t src_ip;
1440         int     x;
1441         uchar *pkt;
1442 #if defined(CONFIG_CMD_CDP)
1443         int iscdp;
1444 #endif
1445         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1446
1447         debug("packet received\n");
1448
1449         NetRxPacket = inpkt;
1450         NetRxPacketLen = len;
1451         et = (Ethernet_t *)inpkt;
1452
1453         /* too small packet? */
1454         if (len < ETHER_HDR_SIZE)
1455                 return;
1456
1457 #ifdef CONFIG_API
1458         if (push_packet) {
1459                 (*push_packet)(inpkt, len);
1460                 return;
1461         }
1462 #endif
1463
1464 #if defined(CONFIG_CMD_CDP)
1465         /* keep track if packet is CDP */
1466         iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0;
1467 #endif
1468
1469         myvlanid = ntohs(NetOurVLAN);
1470         if (myvlanid == (ushort)-1)
1471                 myvlanid = VLAN_NONE;
1472         mynvlanid = ntohs(NetOurNativeVLAN);
1473         if (mynvlanid == (ushort)-1)
1474                 mynvlanid = VLAN_NONE;
1475
1476         x = ntohs(et->et_protlen);
1477
1478         debug("packet received\n");
1479
1480         if (x < 1514) {
1481                 /*
1482                  *      Got a 802 packet.  Check the other protocol field.
1483                  */
1484                 x = ntohs(et->et_prot);
1485
1486                 ip = (IP_t *)(inpkt + E802_HDR_SIZE);
1487                 len -= E802_HDR_SIZE;
1488
1489         } else if (x != PROT_VLAN) {    /* normal packet */
1490                 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE);
1491                 len -= ETHER_HDR_SIZE;
1492
1493         } else {                        /* VLAN packet */
1494                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et;
1495
1496                 debug("VLAN packet received\n");
1497
1498                 /* too small packet? */
1499                 if (len < VLAN_ETHER_HDR_SIZE)
1500                         return;
1501
1502                 /* if no VLAN active */
1503                 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
1504 #if defined(CONFIG_CMD_CDP)
1505                                 && iscdp == 0
1506 #endif
1507                                 )
1508                         return;
1509
1510                 cti = ntohs(vet->vet_tag);
1511                 vlanid = cti & VLAN_IDMASK;
1512                 x = ntohs(vet->vet_type);
1513
1514                 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE);
1515                 len -= VLAN_ETHER_HDR_SIZE;
1516         }
1517
1518         debug("Receive from protocol 0x%x\n", x);
1519
1520 #if defined(CONFIG_CMD_CDP)
1521         if (iscdp) {
1522                 CDPHandler((uchar *)ip, len);
1523                 return;
1524         }
1525 #endif
1526
1527         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1528                 if (vlanid == VLAN_NONE)
1529                         vlanid = (mynvlanid & VLAN_IDMASK);
1530                 /* not matched? */
1531                 if (vlanid != (myvlanid & VLAN_IDMASK))
1532                         return;
1533         }
1534
1535         switch (x) {
1536
1537         case PROT_ARP:
1538                 /*
1539                  * We have to deal with two types of ARP packets:
1540                  * - REQUEST packets will be answered by sending  our
1541                  *   IP address - if we know it.
1542                  * - REPLY packates are expected only after we asked
1543                  *   for the TFTP server's or the gateway's ethernet
1544                  *   address; so if we receive such a packet, we set
1545                  *   the server ethernet address
1546                  */
1547                 debug("Got ARP\n");
1548
1549                 arp = (ARP_t *)ip;
1550                 if (len < ARP_HDR_SIZE) {
1551                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1552                         return;
1553                 }
1554                 if (ntohs(arp->ar_hrd) != ARP_ETHER)
1555                         return;
1556                 if (ntohs(arp->ar_pro) != PROT_IP)
1557                         return;
1558                 if (arp->ar_hln != 6)
1559                         return;
1560                 if (arp->ar_pln != 4)
1561                         return;
1562
1563                 if (NetOurIP == 0)
1564                         return;
1565
1566                 if (NetReadIP(&arp->ar_data[16]) != NetOurIP)
1567                         return;
1568
1569                 switch (ntohs(arp->ar_op)) {
1570                 case ARPOP_REQUEST:
1571                         /* reply with our IP address */
1572                         debug("Got ARP REQUEST, return our IP\n");
1573                         pkt = (uchar *)et;
1574                         pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
1575                         arp->ar_op = htons(ARPOP_REPLY);
1576                         memcpy(&arp->ar_data[10], &arp->ar_data[0], 6);
1577                         NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
1578                         memcpy(&arp->ar_data[0], NetOurEther, 6);
1579                         NetCopyIP(&arp->ar_data[6], &NetOurIP);
1580                         (void) eth_send((uchar *)et,
1581                                         (pkt - (uchar *)et) + ARP_HDR_SIZE);
1582                         return;
1583
1584                 case ARPOP_REPLY:               /* arp reply */
1585                         /* are we waiting for a reply */
1586                         if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
1587                                 break;
1588
1589 #ifdef CONFIG_KEEP_SERVERADDR
1590                         if (NetServerIP == NetArpWaitPacketIP) {
1591                                 char buf[20];
1592                                 sprintf(buf, "%pM", arp->ar_data);
1593                                 setenv("serveraddr", buf);
1594                         }
1595 #endif
1596
1597                         debug("Got ARP REPLY, set server/gtwy eth addr (%pM)\n",
1598                                 arp->ar_data);
1599
1600                         tmp = NetReadIP(&arp->ar_data[6]);
1601
1602                         /* matched waiting packet's address */
1603                         if (tmp == NetArpWaitReplyIP) {
1604                                 debug("Got it\n");
1605
1606                                 /* save address for later use */
1607                                 memcpy(NetArpWaitPacketMAC,
1608                                        &arp->ar_data[0], 6);
1609
1610 #ifdef CONFIG_NETCONSOLE
1611                                 (*packetHandler)(0, 0, 0, 0, 0);
1612 #endif
1613                                 /* modify header, and transmit it */
1614                                 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->
1615                                         et_dest, NetArpWaitPacketMAC, 6);
1616                                 (void) eth_send(NetArpWaitTxPacket,
1617                                                 NetArpWaitTxPacketSize);
1618
1619                                 /* no arp request pending now */
1620                                 NetArpWaitPacketIP = 0;
1621                                 NetArpWaitTxPacketSize = 0;
1622                                 NetArpWaitPacketMAC = NULL;
1623
1624                         }
1625                         return;
1626                 default:
1627                         debug("Unexpected ARP opcode 0x%x\n",
1628                               ntohs(arp->ar_op));
1629                         return;
1630                 }
1631                 break;
1632
1633 #ifdef CONFIG_CMD_RARP
1634         case PROT_RARP:
1635                 debug("Got RARP\n");
1636                 arp = (ARP_t *)ip;
1637                 if (len < ARP_HDR_SIZE) {
1638                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1639                         return;
1640                 }
1641
1642                 if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
1643                         (ntohs(arp->ar_hrd) != ARP_ETHER)   ||
1644                         (ntohs(arp->ar_pro) != PROT_IP)     ||
1645                         (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
1646
1647                         puts("invalid RARP header\n");
1648                 } else {
1649                         NetCopyIP(&NetOurIP, &arp->ar_data[16]);
1650                         if (NetServerIP == 0)
1651                                 NetCopyIP(&NetServerIP, &arp->ar_data[6]);
1652                         memcpy(NetServerEther, &arp->ar_data[0], 6);
1653
1654                         (*packetHandler)(0, 0, 0, 0, 0);
1655                 }
1656                 break;
1657 #endif
1658         case PROT_IP:
1659                 debug("Got IP\n");
1660                 /* Before we start poking the header, make sure it is there */
1661                 if (len < IP_HDR_SIZE) {
1662                         debug("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE);
1663                         return;
1664                 }
1665                 /* Check the packet length */
1666                 if (len < ntohs(ip->ip_len)) {
1667                         printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
1668                         return;
1669                 }
1670                 len = ntohs(ip->ip_len);
1671                 debug("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
1672
1673                 /* Can't deal with anything except IPv4 */
1674                 if ((ip->ip_hl_v & 0xf0) != 0x40)
1675                         return;
1676                 /* Can't deal with IP options (headers != 20 bytes) */
1677                 if ((ip->ip_hl_v & 0x0f) > 0x05)
1678                         return;
1679                 /* Check the Checksum of the header */
1680                 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
1681                         puts("checksum bad\n");
1682                         return;
1683                 }
1684                 /* If it is not for us, ignore it */
1685                 tmp = NetReadIP(&ip->ip_dst);
1686                 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
1687 #ifdef CONFIG_MCAST_TFTP
1688                         if (Mcast_addr != tmp)
1689 #endif
1690                                 return;
1691                 }
1692                 /* Read source IP address for later use */
1693                 src_ip = NetReadIP(&ip->ip_src);
1694                 /*
1695                  * The function returns the unchanged packet if it's not
1696                  * a fragment, and either the complete packet or NULL if
1697                  * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1698                  */
1699                 ip = NetDefragment(ip, &len);
1700                 if (!ip)
1701                         return;
1702                 /*
1703                  * watch for ICMP host redirects
1704                  *
1705                  * There is no real handler code (yet). We just watch
1706                  * for ICMP host redirect messages. In case anybody
1707                  * sees these messages: please contact me
1708                  * (wd@denx.de), or - even better - send me the
1709                  * necessary fixes :-)
1710                  *
1711                  * Note: in all cases where I have seen this so far
1712                  * it was a problem with the router configuration,
1713                  * for instance when a router was configured in the
1714                  * BOOTP reply, but the TFTP server was on the same
1715                  * subnet. So this is probably a warning that your
1716                  * configuration might be wrong. But I'm not really
1717                  * sure if there aren't any other situations.
1718                  *
1719                  * Simon Glass <sjg@chromium.org>: We get an ICMP when
1720                  * we send a tftp packet to a dead connection, or when
1721                  * there is no server at the other end.
1722                  */
1723                 if (ip->ip_p == IPPROTO_ICMP) {
1724                         receive_icmp(ip, len, src_ip, et);
1725                         return;
1726                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1727                         return;
1728                 }
1729
1730 #ifdef CONFIG_UDP_CHECKSUM
1731                 if (ip->udp_xsum != 0) {
1732                         ulong   xsum;
1733                         ushort *sumptr;
1734                         ushort  sumlen;
1735
1736                         xsum  = ip->ip_p;
1737                         xsum += (ntohs(ip->udp_len));
1738                         xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
1739                         xsum += (ntohl(ip->ip_src) >>  0) & 0x0000ffff;
1740                         xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
1741                         xsum += (ntohl(ip->ip_dst) >>  0) & 0x0000ffff;
1742
1743                         sumlen = ntohs(ip->udp_len);
1744                         sumptr = (ushort *) &(ip->udp_src);
1745
1746                         while (sumlen > 1) {
1747                                 ushort sumdata;
1748
1749                                 sumdata = *sumptr++;
1750                                 xsum += ntohs(sumdata);
1751                                 sumlen -= 2;
1752                         }
1753                         if (sumlen > 0) {
1754                                 ushort sumdata;
1755
1756                                 sumdata = *(unsigned char *) sumptr;
1757                                 sumdata = (sumdata << 8) & 0xff00;
1758                                 xsum += sumdata;
1759                         }
1760                         while ((xsum >> 16) != 0) {
1761                                 xsum = (xsum & 0x0000ffff) +
1762                                        ((xsum >> 16) & 0x0000ffff);
1763                         }
1764                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1765                                 printf(" UDP wrong checksum %08lx %08x\n",
1766                                         xsum, ntohs(ip->udp_xsum));
1767                                 return;
1768                         }
1769                 }
1770 #endif
1771
1772
1773 #ifdef CONFIG_NETCONSOLE
1774                 nc_input_packet((uchar *)ip + IP_HDR_SIZE,
1775                                                 ntohs(ip->udp_dst),
1776                                                 ntohs(ip->udp_src),
1777                                                 ntohs(ip->udp_len) - 8);
1778 #endif
1779                 /*
1780                  *      IP header OK.  Pass the packet to the current handler.
1781                  */
1782                 (*packetHandler)((uchar *)ip + IP_HDR_SIZE,
1783                                                 ntohs(ip->udp_dst),
1784                                                 src_ip,
1785                                                 ntohs(ip->udp_src),
1786                                                 ntohs(ip->udp_len) - 8);
1787                 break;
1788         }
1789 }
1790
1791
1792 /**********************************************************************/
1793
1794 static int net_check_prereq(enum proto_t protocol)
1795 {
1796         switch (protocol) {
1797                 /* Fall through */
1798 #if defined(CONFIG_CMD_PING)
1799         case PING:
1800                 if (NetPingIP == 0) {
1801                         puts("*** ERROR: ping address not given\n");
1802                         return 1;
1803                 }
1804                 goto common;
1805 #endif
1806 #if defined(CONFIG_CMD_SNTP)
1807         case SNTP:
1808                 if (NetNtpServerIP == 0) {
1809                         puts("*** ERROR: NTP server address not given\n");
1810                         return 1;
1811                 }
1812                 goto common;
1813 #endif
1814 #if defined(CONFIG_CMD_DNS)
1815         case DNS:
1816                 if (NetOurDNSIP == 0) {
1817                         puts("*** ERROR: DNS server address not given\n");
1818                         return 1;
1819                 }
1820                 goto common;
1821 #endif
1822 #if defined(CONFIG_CMD_NFS)
1823         case NFS:
1824 #endif
1825         case TFTPGET:
1826         case TFTPPUT:
1827                 if (NetServerIP == 0) {
1828                         puts("*** ERROR: `serverip' not set\n");
1829                         return 1;
1830                 }
1831 #if     defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
1832         defined(CONFIG_CMD_DNS)
1833 common:
1834 #endif
1835                 /* Fall through */
1836
1837         case NETCONS:
1838         case TFTPSRV:
1839                 if (NetOurIP == 0) {
1840                         puts("*** ERROR: `ipaddr' not set\n");
1841                         return 1;
1842                 }
1843                 /* Fall through */
1844
1845 #ifdef CONFIG_CMD_RARP
1846         case RARP:
1847 #endif
1848         case BOOTP:
1849         case CDP:
1850         case DHCP:
1851                 if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
1852                         int num = eth_get_dev_index();
1853
1854                         switch (num) {
1855                         case -1:
1856                                 puts("*** ERROR: No ethernet found.\n");
1857                                 return 1;
1858                         case 0:
1859                                 puts("*** ERROR: `ethaddr' not set\n");
1860                                 break;
1861                         default:
1862                                 printf("*** ERROR: `eth%daddr' not set\n",
1863                                         num);
1864                                 break;
1865                         }
1866
1867                         NetStartAgain();
1868                         return 2;
1869                 }
1870                 /* Fall through */
1871         default:
1872                 return 0;
1873         }
1874         return 0;               /* OK */
1875 }
1876 /**********************************************************************/
1877
1878 int
1879 NetCksumOk(uchar *ptr, int len)
1880 {
1881         return !((NetCksum(ptr, len) + 1) & 0xfffe);
1882 }
1883
1884
1885 unsigned
1886 NetCksum(uchar *ptr, int len)
1887 {
1888         ulong   xsum;
1889         ushort *p = (ushort *)ptr;
1890
1891         xsum = 0;
1892         while (len-- > 0)
1893                 xsum += *p++;
1894         xsum = (xsum & 0xffff) + (xsum >> 16);
1895         xsum = (xsum & 0xffff) + (xsum >> 16);
1896         return xsum & 0xffff;
1897 }
1898
1899 int
1900 NetEthHdrSize(void)
1901 {
1902         ushort myvlanid;
1903
1904         myvlanid = ntohs(NetOurVLAN);
1905         if (myvlanid == (ushort)-1)
1906                 myvlanid = VLAN_NONE;
1907
1908         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1909                 VLAN_ETHER_HDR_SIZE;
1910 }
1911
1912 int
1913 NetSetEther(uchar *xet, uchar * addr, uint prot)
1914 {
1915         Ethernet_t *et = (Ethernet_t *)xet;
1916         ushort myvlanid;
1917
1918         myvlanid = ntohs(NetOurVLAN);
1919         if (myvlanid == (ushort)-1)
1920                 myvlanid = VLAN_NONE;
1921
1922         memcpy(et->et_dest, addr, 6);
1923         memcpy(et->et_src, NetOurEther, 6);
1924         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1925                 et->et_protlen = htons(prot);
1926                 return ETHER_HDR_SIZE;
1927         } else {
1928                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet;
1929
1930                 vet->vet_vlan_type = htons(PROT_VLAN);
1931                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1932                 vet->vet_type = htons(prot);
1933                 return VLAN_ETHER_HDR_SIZE;
1934         }
1935 }
1936
1937 void
1938 NetSetIP(uchar *xip, IPaddr_t dest, int dport, int sport, int len)
1939 {
1940         IP_t *ip = (IP_t *)xip;
1941
1942         /*
1943          *      If the data is an odd number of bytes, zero the
1944          *      byte after the last byte so that the checksum
1945          *      will work.
1946          */
1947         if (len & 1)
1948                 xip[IP_HDR_SIZE + len] = 0;
1949
1950         /*
1951          *      Construct an IP and UDP header.
1952          *      (need to set no fragment bit - XXX)
1953          */
1954         /* IP_HDR_SIZE / 4 (not including UDP) */
1955         ip->ip_hl_v  = 0x45;
1956         ip->ip_tos   = 0;
1957         ip->ip_len   = htons(IP_HDR_SIZE + len);
1958         ip->ip_id    = htons(NetIPID++);
1959         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1960         ip->ip_ttl   = 255;
1961         ip->ip_p     = 17;              /* UDP */
1962         ip->ip_sum   = 0;
1963         /* already in network byte order */
1964         NetCopyIP((void *)&ip->ip_src, &NetOurIP);
1965         /* - "" - */
1966         NetCopyIP((void *)&ip->ip_dst, &dest);
1967         ip->udp_src  = htons(sport);
1968         ip->udp_dst  = htons(dport);
1969         ip->udp_len  = htons(8 + len);
1970         ip->udp_xsum = 0;
1971         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
1972 }
1973
1974 void copy_filename(char *dst, const char *src, int size)
1975 {
1976         if (*src && (*src == '"')) {
1977                 ++src;
1978                 --size;
1979         }
1980
1981         while ((--size > 0) && *src && (*src != '"'))
1982                 *dst++ = *src++;
1983         *dst = '\0';
1984 }
1985
1986 #if     defined(CONFIG_CMD_NFS)         || \
1987         defined(CONFIG_CMD_SNTP)        || \
1988         defined(CONFIG_CMD_DNS)
1989 /*
1990  * make port a little random (1024-17407)
1991  * This keeps the math somewhat trivial to compute, and seems to work with
1992  * all supported protocols/clients/servers
1993  */
1994 unsigned int random_port(void)
1995 {
1996         return 1024 + (get_timer(0) % 0x4000);
1997 }
1998 #endif
1999
2000 void ip_to_string(IPaddr_t x, char *s)
2001 {
2002         x = ntohl(x);
2003         sprintf(s, "%d.%d.%d.%d",
2004                 (int) ((x >> 24) & 0xff),
2005                 (int) ((x >> 16) & 0xff),
2006                 (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
2007         );
2008 }
2009
2010 void VLAN_to_string(ushort x, char *s)
2011 {
2012         x = ntohs(x);
2013
2014         if (x == (ushort)-1)
2015                 x = VLAN_NONE;
2016
2017         if (x == VLAN_NONE)
2018                 strcpy(s, "none");
2019         else
2020                 sprintf(s, "%d", x & VLAN_IDMASK);
2021 }
2022
2023 ushort string_to_VLAN(const char *s)
2024 {
2025         ushort id;
2026
2027         if (s == NULL)
2028                 return htons(VLAN_NONE);
2029
2030         if (*s < '0' || *s > '9')
2031                 id = VLAN_NONE;
2032         else
2033                 id = (ushort)simple_strtoul(s, NULL, 10);
2034
2035         return htons(id);
2036 }
2037
2038 ushort getenv_VLAN(char *var)
2039 {
2040         return string_to_VLAN(getenv(var));
2041 }