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