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