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