net/net.c

   1 /*
   2  *      Copied from Linux Monitor (LiMon) - Networking.
   3  *
   4  *      Copyright 1994 - 2000 Neil Russell.
   5  *      (See License)
   6  *      Copyright 2000 Roland Borde
   7  *      Copyright 2000 Paolo Scaffardi
   8  *      Copyright 2000-2002 Wolfgang Denk, wd@denx.de
   9  */
  10
  11 /*
  12  * General Desription:
  13  *
  14  * The user interface supports commands for BOOTP, RARP, and TFTP.
  15  * Also, we support ARP internally. Depending on available data,
  16  * these interact as follows:
  17  *
  18  * BOOTP:
  19  *
  20  *      Prerequisites:  - own ethernet address
  21  *      We want:        - own IP address
  22  *                      - TFTP server IP address
  23  *                      - name of bootfile
  24  *      Next step:      ARP
  25  *
  26  * RARP:
  27  *
  28  *      Prerequisites:  - own ethernet address
  29  *      We want:        - own IP address
  30  *                      - TFTP server IP address
  31  *      Next step:      ARP
  32  *
  33  * ARP:
  34  *
  35  *      Prerequisites:  - own ethernet address
  36  *                      - own IP address
  37  *                      - TFTP server IP address
  38  *      We want:        - TFTP server ethernet address
  39  *      Next step:      TFTP
  40  *
  41  * DHCP:
  42  *
  43  *     Prerequisites:   - own ethernet address
  44  *     We want:         - IP, Netmask, ServerIP, Gateway IP
  45  *                      - bootfilename, lease time
  46  *     Next step:       - TFTP
  47  *
  48  * TFTP:
  49  *
  50  *      Prerequisites:  - own ethernet address
  51  *                      - own IP address
  52  *                      - TFTP server IP address
  53  *                      - TFTP server ethernet address
  54  *                      - name of bootfile (if unknown, we use a default name
  55  *                        derived from our own IP address)
  56  *      We want:        - load the boot file
  57  *      Next step:      none
  58  *
  59  * NFS:
  60  *
  61  *      Prerequisites:  - own ethernet address
  62  *                      - own IP address
  63  *                      - name of bootfile (if unknown, we use a default name
  64  *                        derived from our own IP address)
  65  *      We want:        - load the boot file
  66  *      Next step:      none
  67  *
  68  * SNTP:
  69  *
  70  *      Prerequisites:  - own ethernet address
  71  *                      - own IP address
  72  *      We want:        - network time
  73  *      Next step:      none
  74  */
  75
  76
  77 #include <common.h>
  78 #include <watchdog.h>
  79 #include <command.h>
  80 #include <linux/compiler.h>
  81 #include <net.h>
  82 #include "bootp.h"
  83 #include "tftp.h"
  84 #ifdef CONFIG_CMD_RARP
  85 #include "rarp.h"
  86 #endif
  87 #include "nfs.h"
  88 #ifdef CONFIG_STATUS_LED
  89 #include <status_led.h>
  90 #include <miiphy.h>
  91 #endif
  92 #if defined(CONFIG_CMD_SNTP)
  93 #include "sntp.h"
  94 #endif
  95 #if defined(CONFIG_CDP_VERSION)
  96 #include <timestamp.h>
  97 #endif
  98 #if defined(CONFIG_CMD_DNS)
  99 #include "dns.h"
 100 #endif
 101
 102 DECLARE_GLOBAL_DATA_PTR;
 103
 104 #ifndef CONFIG_ARP_TIMEOUT
 105 /* Milliseconds before trying ARP again */
 106 # define ARP_TIMEOUT            5000UL
 107 #else
 108 # define ARP_TIMEOUT            CONFIG_ARP_TIMEOUT
 109 #endif
 110
 111
 112 #ifndef CONFIG_NET_RETRY_COUNT
 113 # define ARP_TIMEOUT_COUNT      5       /* # of timeouts before giving up  */
 114 #else
 115 # define ARP_TIMEOUT_COUNT      CONFIG_NET_RETRY_COUNT
 116 #endif
 117
 118 /** BOOTP EXTENTIONS **/
 119
 120 /* Our subnet mask (0=unknown) */
 121 IPaddr_t        NetOurSubnetMask;
 122 /* Our gateways IP address */
 123 IPaddr_t        NetOurGatewayIP;
 124 /* Our DNS IP address */
 125 IPaddr_t        NetOurDNSIP;
 126 #if defined(CONFIG_BOOTP_DNS2)
 127 /* Our 2nd DNS IP address */
 128 IPaddr_t        NetOurDNS2IP;
 129 #endif
 130 /* Our NIS domain */
 131 char            NetOurNISDomain[32] = {0,};
 132 /* Our hostname */
 133 char            NetOurHostName[32] = {0,};
 134 /* Our bootpath */
 135 char            NetOurRootPath[64] = {0,};
 136 /* Our bootfile size in blocks */
 137 ushort          NetBootFileSize;
 138
 139 #ifdef CONFIG_MCAST_TFTP        /* Multicast TFTP */
 140 IPaddr_t Mcast_addr;
 141 #endif
 142
 143 /** END OF BOOTP EXTENTIONS **/
 144
 145 /* The actual transferred size of the bootfile (in bytes) */
 146 ulong           NetBootFileXferSize;
 147 /* Our ethernet address */
 148 uchar           NetOurEther[6];
 149 /* Boot server enet address */
 150 uchar           NetServerEther[6];
 151 /* Our IP addr (0 = unknown) */
 152 IPaddr_t        NetOurIP;
 153 /* Server IP addr (0 = unknown) */
 154 IPaddr_t        NetServerIP;
 155 /* Current receive packet */
 156 uchar *NetRxPacket;
 157 /* Current rx packet length */
 158 int             NetRxPacketLen;
 159 /* IP packet ID */
 160 unsigned        NetIPID;
 161 /* Ethernet bcast address */
 162 uchar           NetBcastAddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 163 uchar           NetEtherNullAddr[6];
 164 #ifdef CONFIG_API
 165 void            (*push_packet)(void *, int len) = 0;
 166 #endif
 167 #if defined(CONFIG_CMD_CDP)
 168 /* Ethernet bcast address */
 169 uchar           NetCDPAddr[6] = { 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc };
 170 #endif
 171 /* Network loop state */
 172 int             NetState;
 173 /* Tried all network devices */
 174 int             NetRestartWrap;
 175 /* Network loop restarted */
 176 static int      NetRestarted;
 177 /* At least one device configured */
 178 static int      NetDevExists;
 179
 180 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
 181 /* default is without VLAN */
 182 ushort          NetOurVLAN = 0xFFFF;
 183 /* ditto */
 184 ushort          NetOurNativeVLAN = 0xFFFF;
 185
 186 /* Boot File name */
 187 char            BootFile[128];
 188
 189 #if defined(CONFIG_CMD_PING)
 190 /* the ip address to ping */
 191 IPaddr_t        NetPingIP;
 192
 193 static void PingStart(void);
 194 #endif
 195
 196 #if defined(CONFIG_CMD_CDP)
 197 static void CDPStart(void);
 198 #endif
 199
 200 #if defined(CONFIG_CMD_SNTP)
 201 /* NTP server IP address */
 202 IPaddr_t        NetNtpServerIP;
 203 /* offset time from UTC */
 204 int             NetTimeOffset;
 205 #endif
 206
 207 uchar PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 208
 209 /* Receive packet */
 210 uchar *NetRxPackets[PKTBUFSRX];
 211
 212 /* Current RX packet handler */
 213 static rxhand_f *packetHandler;
 214 #ifdef CONFIG_CMD_TFTPPUT
 215 static rxhand_icmp_f *packet_icmp_handler;      /* Current ICMP rx handler */
 216 #endif
 217 /* Current timeout handler */
 218 static thand_f *timeHandler;
 219 /* Time base value */
 220 static ulong    timeStart;
 221 /* Current timeout value */
 222 static ulong    timeDelta;
 223 /* THE transmit packet */
 224 uchar *NetTxPacket;
 225
 226 static int net_check_prereq(enum proto_t protocol);
 227
 228 static int NetTryCount;
 229
 230 /**********************************************************************/
 231
 232 IPaddr_t        NetArpWaitPacketIP;
 233 IPaddr_t        NetArpWaitReplyIP;
 234 /* MAC address of waiting packet's destination */
 235 uchar          *NetArpWaitPacketMAC;
 236 /* THE transmit packet */
 237 uchar          *NetArpWaitTxPacket;
 238 int             NetArpWaitTxPacketSize;
 239 uchar           NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
 240 ulong           NetArpWaitTimerStart;
 241 int             NetArpWaitTry;
 242
 243 void ArpRequest(void)
 244 {
 245         uchar *pkt;
 246         ARP_t *arp;
 247
 248         debug("ARP broadcast %d\n", NetArpWaitTry);
 249
 250         pkt = NetTxPacket;
 251
 252         pkt += NetSetEther(pkt, NetBcastAddr, PROT_ARP);
 253
 254         arp = (ARP_t *) pkt;
 255
 256         arp->ar_hrd = htons(ARP_ETHER);
 257         arp->ar_pro = htons(PROT_IP);
 258         arp->ar_hln = 6;
 259         arp->ar_pln = 4;
 260         arp->ar_op = htons(ARPOP_REQUEST);
 261
 262         /* source ET addr */
 263         memcpy(&arp->ar_data[0], NetOurEther, 6);
 264         /* source IP addr */
 265         NetWriteIP((uchar *) &arp->ar_data[6], NetOurIP);
 266         /* dest ET addr = 0 */
 267         memset(&arp->ar_data[10], '\0', 6);
 268         if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
 269             (NetOurIP & NetOurSubnetMask)) {
 270                 if (NetOurGatewayIP == 0) {
 271                         puts("## Warning: gatewayip needed but not set\n");
 272                         NetArpWaitReplyIP = NetArpWaitPacketIP;
 273                 } else {
 274                         NetArpWaitReplyIP = NetOurGatewayIP;
 275                 }
 276         } else {
 277                 NetArpWaitReplyIP = NetArpWaitPacketIP;
 278         }
 279
 280         NetWriteIP((uchar *) &arp->ar_data[16], NetArpWaitReplyIP);
 281         (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
 282 }
 283
 284 void ArpTimeoutCheck(void)
 285 {
 286         ulong t;
 287
 288         if (!NetArpWaitPacketIP)
 289                 return;
 290
 291         t = get_timer(0);
 292
 293         /* check for arp timeout */
 294         if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT) {
 295                 NetArpWaitTry++;
 296
 297                 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
 298                         puts("\nARP Retry count exceeded; starting again\n");
 299                         NetArpWaitTry = 0;
 300                         NetStartAgain();
 301                 } else {
 302                         NetArpWaitTimerStart = t;
 303                         ArpRequest();
 304                 }
 305         }
 306 }
 307
 308 /*
 309  * Check if autoload is enabled. If so, use either NFS or TFTP to download
 310  * the boot file.
 311  */
 312 void net_auto_load(void)
 313 {
 314         const char *s = getenv("autoload");
 315
 316         if (s != NULL) {
 317                 if (*s == 'n') {
 318                         /*
 319                          * Just use BOOTP/RARP to configure system;
 320                          * Do not use TFTP to load the bootfile.
 321                          */
 322                         NetState = NETLOOP_SUCCESS;
 323                         return;
 324                 }
 325 #if defined(CONFIG_CMD_NFS)
 326                 if (strcmp(s, "NFS") == 0) {
 327                         /*
 328                          * Use NFS to load the bootfile.
 329                          */
 330                         NfsStart();
 331                         return;
 332                 }
 333 #endif
 334         }
 335         TftpStart(TFTPGET);
 336 }
 337
 338 static void NetInitLoop(enum proto_t protocol)
 339 {
 340         static int env_changed_id;
 341         bd_t *bd = gd->bd;
 342         int env_id = get_env_id();
 343
 344         /* update only when the environment has changed */
 345         if (env_changed_id != env_id) {
 346                 NetOurIP = getenv_IPaddr("ipaddr");
 347                 NetCopyIP(&bd->bi_ip_addr, &NetOurIP);
 348                 NetOurGatewayIP = getenv_IPaddr("gatewayip");
 349                 NetOurSubnetMask = getenv_IPaddr("netmask");
 350                 NetServerIP = getenv_IPaddr("serverip");
 351                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 352                 NetOurVLAN = getenv_VLAN("vlan");
 353 #if defined(CONFIG_CMD_DNS)
 354                 NetOurDNSIP = getenv_IPaddr("dnsip");
 355 #endif
 356                 env_changed_id = env_id;
 357         }
 358
 359         return;
 360 }
 361
 362 /**********************************************************************/
 363 /*
 364  *      Main network processing loop.
 365  */
 366
 367 int NetLoop(enum proto_t protocol)
 368 {
 369         bd_t *bd = gd->bd;
 370         int ret = -1;
 371
 372         NetRestarted = 0;
 373         NetDevExists = 0;
 374
 375         /* XXX problem with bss workaround */
 376         NetArpWaitPacketMAC = NULL;
 377         NetArpWaitTxPacket = NULL;
 378         NetArpWaitPacketIP = 0;
 379         NetArpWaitReplyIP = 0;
 380         NetArpWaitTxPacket = NULL;
 381         NetTxPacket = NULL;
 382         NetTryCount = 1;
 383
 384         if (!NetTxPacket) {
 385                 int     i;
 386                 /*
 387                  *      Setup packet buffers, aligned correctly.
 388                  */
 389                 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
 390                 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
 391                 for (i = 0; i < PKTBUFSRX; i++)
 392                         NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
 393         }
 394
 395         if (!NetArpWaitTxPacket) {
 396                 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
 397                 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
 398                 NetArpWaitTxPacketSize = 0;
 399         }
 400
 401         bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
 402         eth_halt();
 403         eth_set_current();
 404         if (eth_init(bd) < 0) {
 405                 eth_halt();
 406                 return -1;
 407         }
 408
 409 restart:
 410         memcpy(NetOurEther, eth_get_dev()->enetaddr, 6);
 411
 412         NetState = NETLOOP_CONTINUE;
 413
 414         /*
 415          *      Start the ball rolling with the given start function.  From
 416          *      here on, this code is a state machine driven by received
 417          *      packets and timer events.
 418          */
 419         NetInitLoop(protocol);
 420
 421         switch (net_check_prereq(protocol)) {
 422         case 1:
 423                 /* network not configured */
 424                 eth_halt();
 425                 return -1;
 426
 427         case 2:
 428                 /* network device not configured */
 429                 break;
 430
 431         case 0:
 432                 NetDevExists = 1;
 433                 NetBootFileXferSize = 0;
 434                 switch (protocol) {
 435                 case TFTPGET:
 436 #ifdef CONFIG_CMD_TFTPPUT
 437                 case TFTPPUT:
 438 #endif
 439                         /* always use ARP to get server ethernet address */
 440                         TftpStart(protocol);
 441                         break;
 442 #ifdef CONFIG_CMD_TFTPSRV
 443                 case TFTPSRV:
 444                         TftpStartServer();
 445                         break;
 446 #endif
 447 #if defined(CONFIG_CMD_DHCP)
 448                 case DHCP:
 449                         BootpTry = 0;
 450                         NetOurIP = 0;
 451                         DhcpRequest();          /* Basically same as BOOTP */
 452                         break;
 453 #endif
 454
 455                 case BOOTP:
 456                         BootpTry = 0;
 457                         NetOurIP = 0;
 458                         BootpRequest();
 459                         break;
 460
 461 #if defined(CONFIG_CMD_RARP)
 462                 case RARP:
 463                         RarpTry = 0;
 464                         NetOurIP = 0;
 465                         RarpRequest();
 466                         break;
 467 #endif
 468 #if defined(CONFIG_CMD_PING)
 469                 case PING:
 470                         PingStart();
 471                         break;
 472 #endif
 473 #if defined(CONFIG_CMD_NFS)
 474                 case NFS:
 475                         NfsStart();
 476                         break;
 477 #endif
 478 #if defined(CONFIG_CMD_CDP)
 479                 case CDP:
 480                         CDPStart();
 481                         break;
 482 #endif
 483 #ifdef CONFIG_NETCONSOLE
 484                 case NETCONS:
 485                         NcStart();
 486                         break;
 487 #endif
 488 #if defined(CONFIG_CMD_SNTP)
 489                 case SNTP:
 490                         SntpStart();
 491                         break;
 492 #endif
 493 #if defined(CONFIG_CMD_DNS)
 494                 case DNS:
 495                         DnsStart();
 496                         break;
 497 #endif
 498                 default:
 499                         break;
 500                 }
 501
 502                 break;
 503         }
 504
 505 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 506 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 507         defined(CONFIG_STATUS_LED)                      && \
 508         defined(STATUS_LED_RED)
 509         /*
 510          * Echo the inverted link state to the fault LED.
 511          */
 512         if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
 513                 status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
 514         else
 515                 status_led_set(STATUS_LED_RED, STATUS_LED_ON);
 516 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 517 #endif /* CONFIG_MII, ... */
 518
 519         /*
 520          *      Main packet reception loop.  Loop receiving packets until
 521          *      someone sets `NetState' to a state that terminates.
 522          */
 523         for (;;) {
 524                 WATCHDOG_RESET();
 525 #ifdef CONFIG_SHOW_ACTIVITY
 526                 show_activity(1);
 527 #endif
 528                 /*
 529                  *      Check the ethernet for a new packet.  The ethernet
 530                  *      receive routine will process it.
 531                  */
 532                 eth_rx();
 533
 534                 /*
 535                  *      Abort if ctrl-c was pressed.
 536                  */
 537                 if (ctrlc()) {
 538                         eth_halt();
 539                         puts("\nAbort\n");
 540                         goto done;
 541                 }
 542
 543                 ArpTimeoutCheck();
 544
 545                 /*
 546                  *      Check for a timeout, and run the timeout handler
 547                  *      if we have one.
 548                  */
 549                 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
 550                         thand_f *x;
 551
 552 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 553 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 554         defined(CONFIG_STATUS_LED)                      && \
 555         defined(STATUS_LED_RED)
 556                         /*
 557                          * Echo the inverted link state to the fault LED.
 558                          */
 559                         if (miiphy_link(eth_get_dev()->name,
 560                                        CONFIG_SYS_FAULT_MII_ADDR)) {
 561                                 status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
 562                         } else {
 563                                 status_led_set(STATUS_LED_RED, STATUS_LED_ON);
 564                         }
 565 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 566 #endif /* CONFIG_MII, ... */
 567                         x = timeHandler;
 568                         timeHandler = (thand_f *)0;
 569                         (*x)();
 570                 }
 571
 572
 573                 switch (NetState) {
 574
 575                 case NETLOOP_RESTART:
 576                         NetRestarted = 1;
 577                         goto restart;
 578
 579                 case NETLOOP_SUCCESS:
 580                         if (NetBootFileXferSize > 0) {
 581                                 char buf[20];
 582                                 printf("Bytes transferred = %ld (%lx hex)\n",
 583                                         NetBootFileXferSize,
 584                                         NetBootFileXferSize);
 585                                 sprintf(buf, "%lX", NetBootFileXferSize);
 586                                 setenv("filesize", buf);
 587
 588                                 sprintf(buf, "%lX", (unsigned long)load_addr);
 589                                 setenv("fileaddr", buf);
 590                         }
 591                         eth_halt();
 592                         ret = NetBootFileXferSize;
 593                         goto done;
 594
 595                 case NETLOOP_FAIL:
 596                         goto done;
 597                 }
 598         }
 599
 600 done:
 601 #ifdef CONFIG_CMD_TFTPPUT
 602         /* Clear out the handlers */
 603         NetSetHandler(NULL);
 604         net_set_icmp_handler(NULL);
 605 #endif
 606         return ret;
 607 }
 608
 609 /**********************************************************************/
 610
 611 static void
 612 startAgainTimeout(void)
 613 {
 614         NetState = NETLOOP_RESTART;
 615 }
 616
 617 static void
 618 startAgainHandler(uchar *pkt, unsigned dest, IPaddr_t sip,
 619                   unsigned src, unsigned len)
 620 {
 621         /* Totally ignore the packet */
 622 }
 623
 624 void NetStartAgain(void)
 625 {
 626         char *nretry;
 627         int retry_forever = 0;
 628         unsigned long retrycnt = 0;
 629
 630         nretry = getenv("netretry");
 631         if (nretry) {
 632                 if (!strcmp(nretry, "yes"))
 633                         retry_forever = 1;
 634                 else if (!strcmp(nretry, "no"))
 635                         retrycnt = 0;
 636                 else if (!strcmp(nretry, "once"))
 637                         retrycnt = 1;
 638                 else
 639                         retrycnt = simple_strtoul(nretry, NULL, 0);
 640         } else
 641                 retry_forever = 1;
 642
 643         if ((!retry_forever) && (NetTryCount >= retrycnt)) {
 644                 eth_halt();
 645                 NetState = NETLOOP_FAIL;
 646                 return;
 647         }
 648
 649         NetTryCount++;
 650
 651         eth_halt();
 652 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
 653         eth_try_another(!NetRestarted);
 654 #endif
 655         eth_init(gd->bd);
 656         if (NetRestartWrap) {
 657                 NetRestartWrap = 0;
 658                 if (NetDevExists) {
 659                         NetSetTimeout(10000UL, startAgainTimeout);
 660                         NetSetHandler(startAgainHandler);
 661                 } else {
 662                         NetState = NETLOOP_FAIL;
 663                 }
 664         } else {
 665                 NetState = NETLOOP_RESTART;
 666         }
 667 }
 668
 669 /**********************************************************************/
 670 /*
 671  *      Miscelaneous bits.
 672  */
 673
 674 void
 675 NetSetHandler(rxhand_f *f)
 676 {
 677         packetHandler = f;
 678 }
 679
 680 #ifdef CONFIG_CMD_TFTPPUT
 681 void net_set_icmp_handler(rxhand_icmp_f *f)
 682 {
 683         packet_icmp_handler = f;
 684 }
 685 #endif
 686
 687 void
 688 NetSetTimeout(ulong iv, thand_f *f)
 689 {
 690         if (iv == 0) {
 691                 timeHandler = (thand_f *)0;
 692         } else {
 693                 timeHandler = f;
 694                 timeStart = get_timer(0);
 695                 timeDelta = iv;
 696         }
 697 }
 698
 699
 700 void
 701 NetSendPacket(uchar *pkt, int len)
 702 {
 703         (void) eth_send(pkt, len);
 704 }
 705
 706 int
 707 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
 708 {
 709         uchar *pkt;
 710
 711         /* convert to new style broadcast */
 712         if (dest == 0)
 713                 dest = 0xFFFFFFFF;
 714
 715         /* if broadcast, make the ether address a broadcast and don't do ARP */
 716         if (dest == 0xFFFFFFFF)
 717                 ether = NetBcastAddr;
 718
 719         /*
 720          * if MAC address was not discovered yet, save the packet and do
 721          * an ARP request
 722          */
 723         if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
 724
 725                 debug("sending ARP for %08x\n", dest);
 726
 727                 NetArpWaitPacketIP = dest;
 728                 NetArpWaitPacketMAC = ether;
 729
 730                 pkt = NetArpWaitTxPacket;
 731                 pkt += NetSetEther(pkt, NetArpWaitPacketMAC, PROT_IP);
 732
 733                 NetSetIP(pkt, dest, dport, sport, len);
 734                 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket +
 735                        (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len);
 736
 737                 /* size of the waiting packet */
 738                 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) +
 739                         IP_HDR_SIZE + len;
 740
 741                 /* and do the ARP request */
 742                 NetArpWaitTry = 1;
 743                 NetArpWaitTimerStart = get_timer(0);
 744                 ArpRequest();
 745                 return 1;       /* waiting */
 746         }
 747
 748         debug("sending UDP to %08x/%pM\n", dest, ether);
 749
 750         pkt = (uchar *)NetTxPacket;
 751         pkt += NetSetEther(pkt, ether, PROT_IP);
 752         NetSetIP(pkt, dest, dport, sport, len);
 753         (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len);
 754
 755         return 0;       /* transmitted */
 756 }
 757
 758 #if defined(CONFIG_CMD_PING)
 759 static ushort PingSeqNo;
 760
 761 int PingSend(void)
 762 {
 763         static uchar mac[6];
 764         IP_t *ip;
 765         ushort *s;
 766         uchar *pkt;
 767
 768         /* XXX always send arp request */
 769
 770         memcpy(mac, NetEtherNullAddr, 6);
 771
 772         debug("sending ARP for %08x\n", NetPingIP);
 773
 774         NetArpWaitPacketIP = NetPingIP;
 775         NetArpWaitPacketMAC = mac;
 776
 777         pkt = NetArpWaitTxPacket;
 778         pkt += NetSetEther(pkt, mac, PROT_IP);
 779
 780         ip = (IP_t *)pkt;
 781
 782         /*
 783          * Construct an IP and ICMP header.
 784          * (need to set no fragment bit - XXX)
 785          */
 786         /* IP_HDR_SIZE / 4 (not including UDP) */
 787         ip->ip_hl_v  = 0x45;
 788         ip->ip_tos   = 0;
 789         ip->ip_len   = htons(IP_HDR_SIZE_NO_UDP + 8);
 790         ip->ip_id    = htons(NetIPID++);
 791         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
 792         ip->ip_ttl   = 255;
 793         ip->ip_p     = 0x01;            /* ICMP */
 794         ip->ip_sum   = 0;
 795         /* already in network byte order */
 796         NetCopyIP((void *)&ip->ip_src, &NetOurIP);
 797         /* - "" - */
 798         NetCopyIP((void *)&ip->ip_dst, &NetPingIP);
 799         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
 800
 801         s = &ip->udp_src;               /* XXX ICMP starts here */
 802         s[0] = htons(0x0800);           /* echo-request, code */
 803         s[1] = 0;                       /* checksum */
 804         s[2] = 0;                       /* identifier */
 805         s[3] = htons(PingSeqNo++);      /* sequence number */
 806         s[1] = ~NetCksum((uchar *)s, 8/2);
 807
 808         /* size of the waiting packet */
 809         NetArpWaitTxPacketSize =
 810                 (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8;
 811
 812         /* and do the ARP request */
 813         NetArpWaitTry = 1;
 814         NetArpWaitTimerStart = get_timer(0);
 815         ArpRequest();
 816         return 1;       /* waiting */
 817 }
 818
 819 static void
 820 PingTimeout(void)
 821 {
 822         eth_halt();
 823         NetState = NETLOOP_FAIL;        /* we did not get the reply */
 824 }
 825
 826 static void
 827 PingHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
 828             unsigned len)
 829 {
 830         if (sip != NetPingIP)
 831                 return;
 832
 833         NetState = NETLOOP_SUCCESS;
 834 }
 835
 836 static void PingStart(void)
 837 {
 838         printf("Using %s device\n", eth_get_name());
 839         NetSetTimeout(10000UL, PingTimeout);
 840         NetSetHandler(PingHandler);
 841
 842         PingSend();
 843 }
 844 #endif
 845
 846 #if defined(CONFIG_CMD_CDP)
 847
 848 #define CDP_DEVICE_ID_TLV               0x0001
 849 #define CDP_ADDRESS_TLV                 0x0002
 850 #define CDP_PORT_ID_TLV                 0x0003
 851 #define CDP_CAPABILITIES_TLV            0x0004
 852 #define CDP_VERSION_TLV                 0x0005
 853 #define CDP_PLATFORM_TLV                0x0006
 854 #define CDP_NATIVE_VLAN_TLV             0x000a
 855 #define CDP_APPLIANCE_VLAN_TLV          0x000e
 856 #define CDP_TRIGGER_TLV                 0x000f
 857 #define CDP_POWER_CONSUMPTION_TLV       0x0010
 858 #define CDP_SYSNAME_TLV                 0x0014
 859 #define CDP_SYSOBJECT_TLV               0x0015
 860 #define CDP_MANAGEMENT_ADDRESS_TLV      0x0016
 861
 862 #define CDP_TIMEOUT                     250UL   /* one packet every 250ms */
 863
 864 static int CDPSeq;
 865 static int CDPOK;
 866
 867 ushort CDPNativeVLAN;
 868 ushort CDPApplianceVLAN;
 869
 870 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20,
 871                                        0x00 };
 872
 873 static ushort CDP_compute_csum(const uchar *buff, ushort len)
 874 {
 875         ushort csum;
 876         int     odd;
 877         ulong   result = 0;
 878         ushort  leftover;
 879         ushort *p;
 880
 881         if (len > 0) {
 882                 odd = 1 & (ulong)buff;
 883                 if (odd) {
 884                         result = *buff << 8;
 885                         len--;
 886                         buff++;
 887                 }
 888                 while (len > 1) {
 889                         p = (ushort *)buff;
 890                         result += *p++;
 891                         buff = (uchar *)p;
 892                         if (result & 0x80000000)
 893                                 result = (result & 0xFFFF) + (result >> 16);
 894                         len -= 2;
 895                 }
 896                 if (len) {
 897                         leftover = (signed short)(*(const signed char *)buff);
 898                         /* CISCO SUCKS big time! (and blows too):
 899                          * CDP uses the IP checksum algorithm with a twist;
 900                          * for the last byte it *sign* extends and sums.
 901                          */
 902                         result = (result & 0xffff0000) |
 903                                  ((result + leftover) & 0x0000ffff);
 904                 }
 905                 while (result >> 16)
 906                         result = (result & 0xFFFF) + (result >> 16);
 907
 908                 if (odd)
 909                         result = ((result >> 8) & 0xff) |
 910                                  ((result & 0xff) << 8);
 911         }
 912
 913         /* add up 16-bit and 17-bit words for 17+c bits */
 914         result = (result & 0xffff) + (result >> 16);
 915         /* add up 16-bit and 2-bit for 16+c bit */
 916         result = (result & 0xffff) + (result >> 16);
 917         /* add up carry.. */
 918         result = (result & 0xffff) + (result >> 16);
 919
 920         /* negate */
 921         csum = ~(ushort)result;
 922
 923         /* run time endian detection */
 924         if (csum != htons(csum))        /* little endian */
 925                 csum = htons(csum);
 926
 927         return csum;
 928 }
 929
 930 int CDPSendTrigger(void)
 931 {
 932         uchar *pkt;
 933         ushort *s;
 934         ushort *cp;
 935         Ethernet_t *et;
 936         int len;
 937         ushort chksum;
 938 #if     defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID)   || \
 939         defined(CONFIG_CDP_VERSION)   || defined(CONFIG_CDP_PLATFORM)
 940         char buf[32];
 941 #endif
 942
 943         pkt = NetTxPacket;
 944         et = (Ethernet_t *)pkt;
 945
 946         /* NOTE: trigger sent not on any VLAN */
 947
 948         /* form ethernet header */
 949         memcpy(et->et_dest, NetCDPAddr, 6);
 950         memcpy(et->et_src, NetOurEther, 6);
 951
 952         pkt += ETHER_HDR_SIZE;
 953
 954         /* SNAP header */
 955         memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr));
 956         pkt += sizeof(CDP_SNAP_hdr);
 957
 958         /* CDP header */
 959         *pkt++ = 0x02;                          /* CDP version 2 */
 960         *pkt++ = 180;                           /* TTL */
 961         s = (ushort *)pkt;
 962         cp = s;
 963         /* checksum (0 for later calculation) */
 964         *s++ = htons(0);
 965
 966         /* CDP fields */
 967 #ifdef CONFIG_CDP_DEVICE_ID
 968         *s++ = htons(CDP_DEVICE_ID_TLV);
 969         *s++ = htons(CONFIG_CDP_DEVICE_ID);
 970         sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%pm", NetOurEther);
 971         memcpy((uchar *)s, buf, 16);
 972         s += 16 / 2;
 973 #endif
 974
 975 #ifdef CONFIG_CDP_PORT_ID
 976         *s++ = htons(CDP_PORT_ID_TLV);
 977         memset(buf, 0, sizeof(buf));
 978         sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index());
 979         len = strlen(buf);
 980         if (len & 1)    /* make it even */
 981                 len++;
 982         *s++ = htons(len + 4);
 983         memcpy((uchar *)s, buf, len);
 984         s += len / 2;
 985 #endif
 986
 987 #ifdef CONFIG_CDP_CAPABILITIES
 988         *s++ = htons(CDP_CAPABILITIES_TLV);
 989         *s++ = htons(8);
 990         *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES);
 991         s += 2;
 992 #endif
 993
 994 #ifdef CONFIG_CDP_VERSION
 995         *s++ = htons(CDP_VERSION_TLV);
 996         memset(buf, 0, sizeof(buf));
 997         strcpy(buf, CONFIG_CDP_VERSION);
 998         len = strlen(buf);
 999         if (len & 1)    /* make it even */
1000                 len++;
1001         *s++ = htons(len + 4);
1002         memcpy((uchar *)s, buf, len);
1003         s += len / 2;
1004 #endif
1005
1006 #ifdef CONFIG_CDP_PLATFORM
1007         *s++ = htons(CDP_PLATFORM_TLV);
1008         memset(buf, 0, sizeof(buf));
1009         strcpy(buf, CONFIG_CDP_PLATFORM);
1010         len = strlen(buf);
1011         if (len & 1)    /* make it even */
1012                 len++;
1013         *s++ = htons(len + 4);
1014         memcpy((uchar *)s, buf, len);
1015         s += len / 2;
1016 #endif
1017
1018 #ifdef CONFIG_CDP_TRIGGER
1019         *s++ = htons(CDP_TRIGGER_TLV);
1020         *s++ = htons(8);
1021         *(ulong *)s = htonl(CONFIG_CDP_TRIGGER);
1022         s += 2;
1023 #endif
1024
1025 #ifdef CONFIG_CDP_POWER_CONSUMPTION
1026         *s++ = htons(CDP_POWER_CONSUMPTION_TLV);
1027         *s++ = htons(6);
1028         *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION);
1029 #endif
1030
1031         /* length of ethernet packet */
1032         len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE);
1033         et->et_protlen = htons(len);
1034
1035         len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr);
1036         chksum = CDP_compute_csum((uchar *)NetTxPacket + len,
1037                                   (uchar *)s - (NetTxPacket + len));
1038         if (chksum == 0)
1039                 chksum = 0xFFFF;
1040         *cp = htons(chksum);
1041
1042         (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket);
1043         return 0;
1044 }
1045
1046 static void
1047 CDPTimeout(void)
1048 {
1049         CDPSeq++;
1050
1051         if (CDPSeq < 3) {
1052                 NetSetTimeout(CDP_TIMEOUT, CDPTimeout);
1053                 CDPSendTrigger();
1054                 return;
1055         }
1056
1057         /* if not OK try again */
1058         if (!CDPOK)
1059                 NetStartAgain();
1060         else
1061                 NetState = NETLOOP_SUCCESS;
1062 }
1063
1064 static void
1065 CDPDummyHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
1066                 unsigned len)
1067 {
1068         /* nothing */
1069 }
1070
1071 static void
1072 CDPHandler(const uchar *pkt, unsigned len)
1073 {
1074         const uchar *t;
1075         const ushort *ss;
1076         ushort type, tlen;
1077         ushort vlan, nvlan;
1078
1079         /* minimum size? */
1080         if (len < sizeof(CDP_SNAP_hdr) + 4)
1081                 goto pkt_short;
1082
1083         /* check for valid CDP SNAP header */
1084         if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0)
1085                 return;
1086
1087         pkt += sizeof(CDP_SNAP_hdr);
1088         len -= sizeof(CDP_SNAP_hdr);
1089
1090         /* Version of CDP protocol must be >= 2 and TTL != 0 */
1091         if (pkt[0] < 0x02 || pkt[1] == 0)
1092                 return;
1093
1094         /*
1095          * if version is greater than 0x02 maybe we'll have a problem;
1096          * output a warning
1097          */
1098         if (pkt[0] != 0x02)
1099                 printf("**WARNING: CDP packet received with a protocol version "
1100                                 "%d > 2\n", pkt[0] & 0xff);
1101
1102         if (CDP_compute_csum(pkt, len) != 0)
1103                 return;
1104
1105         pkt += 4;
1106         len -= 4;
1107
1108         vlan = htons(-1);
1109         nvlan = htons(-1);
1110         while (len > 0) {
1111                 if (len < 4)
1112                         goto pkt_short;
1113
1114                 ss = (const ushort *)pkt;
1115                 type = ntohs(ss[0]);
1116                 tlen = ntohs(ss[1]);
1117                 if (tlen > len)
1118                         goto pkt_short;
1119
1120                 pkt += tlen;
1121                 len -= tlen;
1122
1123                 ss += 2;        /* point ss to the data of the TLV */
1124                 tlen -= 4;
1125
1126                 switch (type) {
1127                 case CDP_DEVICE_ID_TLV:
1128                         break;
1129                 case CDP_ADDRESS_TLV:
1130                         break;
1131                 case CDP_PORT_ID_TLV:
1132                         break;
1133                 case CDP_CAPABILITIES_TLV:
1134                         break;
1135                 case CDP_VERSION_TLV:
1136                         break;
1137                 case CDP_PLATFORM_TLV:
1138                         break;
1139                 case CDP_NATIVE_VLAN_TLV:
1140                         nvlan = *ss;
1141                         break;
1142                 case CDP_APPLIANCE_VLAN_TLV:
1143                         t = (const uchar *)ss;
1144                         while (tlen > 0) {
1145                                 if (tlen < 3)
1146                                         goto pkt_short;
1147
1148                                 ss = (const ushort *)(t + 1);
1149
1150 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE
1151                                 if (t[0] == CONFIG_CDP_APPLIANCE_VLAN_TYPE)
1152                                         vlan = *ss;
1153 #else
1154                                 /* XXX will this work; dunno */
1155                                 vlan = ntohs(*ss);
1156 #endif
1157                                 t += 3; tlen -= 3;
1158                         }
1159                         break;
1160                 case CDP_TRIGGER_TLV:
1161                         break;
1162                 case CDP_POWER_CONSUMPTION_TLV:
1163                         break;
1164                 case CDP_SYSNAME_TLV:
1165                         break;
1166                 case CDP_SYSOBJECT_TLV:
1167                         break;
1168                 case CDP_MANAGEMENT_ADDRESS_TLV:
1169                         break;
1170                 }
1171         }
1172
1173         CDPApplianceVLAN = vlan;
1174         CDPNativeVLAN = nvlan;
1175
1176         CDPOK = 1;
1177         return;
1178
1179  pkt_short:
1180         printf("** CDP packet is too short\n");
1181         return;
1182 }
1183
1184 static void CDPStart(void)
1185 {
1186         printf("Using %s device\n", eth_get_name());
1187         CDPSeq = 0;
1188         CDPOK = 0;
1189
1190         CDPNativeVLAN = htons(-1);
1191         CDPApplianceVLAN = htons(-1);
1192
1193         NetSetTimeout(CDP_TIMEOUT, CDPTimeout);
1194         NetSetHandler(CDPDummyHandler);
1195
1196         CDPSendTrigger();
1197 }
1198 #endif
1199
1200 #ifdef CONFIG_IP_DEFRAG
1201 /*
1202  * This function collects fragments in a single packet, according
1203  * to the algorithm in RFC815. It returns NULL or the pointer to
1204  * a complete packet, in static storage
1205  */
1206 #ifndef CONFIG_NET_MAXDEFRAG
1207 #define CONFIG_NET_MAXDEFRAG 16384
1208 #endif
1209 /*
1210  * MAXDEFRAG, above, is chosen in the config file and  is real data
1211  * so we need to add the NFS overhead, which is more than TFTP.
1212  * To use sizeof in the internal unnamed structures, we need a real
1213  * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately).
1214  * The compiler doesn't complain nor allocates the actual structure
1215  */
1216 static struct rpc_t rpc_specimen;
1217 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply))
1218
1219 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE_NO_UDP)
1220
1221 /*
1222  * this is the packet being assembled, either data or frag control.
1223  * Fragments go by 8 bytes, so this union must be 8 bytes long
1224  */
1225 struct hole {
1226         /* first_byte is address of this structure */
1227         u16 last_byte;  /* last byte in this hole + 1 (begin of next hole) */
1228         u16 next_hole;  /* index of next (in 8-b blocks), 0 == none */
1229         u16 prev_hole;  /* index of prev, 0 == none */
1230         u16 unused;
1231 };
1232
1233 static IP_t *__NetDefragment(IP_t *ip, int *lenp)
1234 {
1235         static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
1236         static u16 first_hole, total_len;
1237         struct hole *payload, *thisfrag, *h, *newh;
1238         IP_t *localip = (IP_t *)pkt_buff;
1239         uchar *indata = (uchar *)ip;
1240         int offset8, start, len, done = 0;
1241         u16 ip_off = ntohs(ip->ip_off);
1242
1243         /* payload starts after IP header, this fragment is in there */
1244         payload = (struct hole *)(pkt_buff + IP_HDR_SIZE_NO_UDP);
1245         offset8 =  (ip_off & IP_OFFS);
1246         thisfrag = payload + offset8;
1247         start = offset8 * 8;
1248         len = ntohs(ip->ip_len) - IP_HDR_SIZE_NO_UDP;
1249
1250         if (start + len > IP_MAXUDP) /* fragment extends too far */
1251                 return NULL;
1252
1253         if (!total_len || localip->ip_id != ip->ip_id) {
1254                 /* new (or different) packet, reset structs */
1255                 total_len = 0xffff;
1256                 payload[0].last_byte = ~0;
1257                 payload[0].next_hole = 0;
1258                 payload[0].prev_hole = 0;
1259                 first_hole = 0;
1260                 /* any IP header will work, copy the first we received */
1261                 memcpy(localip, ip, IP_HDR_SIZE_NO_UDP);
1262         }
1263
1264         /*
1265          * What follows is the reassembly algorithm. We use the payload
1266          * array as a linked list of hole descriptors, as each hole starts
1267          * at a multiple of 8 bytes. However, last byte can be whatever value,
1268          * so it is represented as byte count, not as 8-byte blocks.
1269          */
1270
1271         h = payload + first_hole;
1272         while (h->last_byte < start) {
1273                 if (!h->next_hole) {
1274                         /* no hole that far away */
1275                         return NULL;
1276                 }
1277                 h = payload + h->next_hole;
1278         }
1279
1280         /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
1281         if (offset8 + ((len + 7) / 8) <= h - payload) {
1282                 /* no overlap with holes (dup fragment?) */
1283                 return NULL;
1284         }
1285
1286         if (!(ip_off & IP_FLAGS_MFRAG)) {
1287                 /* no more fragmentss: truncate this (last) hole */
1288                 total_len = start + len;
1289                 h->last_byte = start + len;
1290         }
1291
1292         /*
1293          * There is some overlap: fix the hole list. This code doesn't
1294          * deal with a fragment that overlaps with two different holes
1295          * (thus being a superset of a previously-received fragment).
1296          */
1297
1298         if ((h >= thisfrag) && (h->last_byte <= start + len)) {
1299                 /* complete overlap with hole: remove hole */
1300                 if (!h->prev_hole && !h->next_hole) {
1301                         /* last remaining hole */
1302                         done = 1;
1303                 } else if (!h->prev_hole) {
1304                         /* first hole */
1305                         first_hole = h->next_hole;
1306                         payload[h->next_hole].prev_hole = 0;
1307                 } else if (!h->next_hole) {
1308                         /* last hole */
1309                         payload[h->prev_hole].next_hole = 0;
1310                 } else {
1311                         /* in the middle of the list */
1312                         payload[h->next_hole].prev_hole = h->prev_hole;
1313                         payload[h->prev_hole].next_hole = h->next_hole;
1314                 }
1315
1316         } else if (h->last_byte <= start + len) {
1317                 /* overlaps with final part of the hole: shorten this hole */
1318                 h->last_byte = start;
1319
1320         } else if (h >= thisfrag) {
1321                 /* overlaps with initial part of the hole: move this hole */
1322                 newh = thisfrag + (len / 8);
1323                 *newh = *h;
1324                 h = newh;
1325                 if (h->next_hole)
1326                         payload[h->next_hole].prev_hole = (h - payload);
1327                 if (h->prev_hole)
1328                         payload[h->prev_hole].next_hole = (h - payload);
1329                 else
1330                         first_hole = (h - payload);
1331
1332         } else {
1333                 /* fragment sits in the middle: split the hole */
1334                 newh = thisfrag + (len / 8);
1335                 *newh = *h;
1336                 h->last_byte = start;
1337                 h->next_hole = (newh - payload);
1338                 newh->prev_hole = (h - payload);
1339                 if (newh->next_hole)
1340                         payload[newh->next_hole].prev_hole = (newh - payload);
1341         }
1342
1343         /* finally copy this fragment and possibly return whole packet */
1344         memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE_NO_UDP, len);
1345         if (!done)
1346                 return NULL;
1347
1348         localip->ip_len = htons(total_len);
1349         *lenp = total_len + IP_HDR_SIZE_NO_UDP;
1350         return localip;
1351 }
1352
1353 static inline IP_t *NetDefragment(IP_t *ip, int *lenp)
1354 {
1355         u16 ip_off = ntohs(ip->ip_off);
1356         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1357                 return ip; /* not a fragment */
1358         return __NetDefragment(ip, lenp);
1359 }
1360
1361 #else /* !CONFIG_IP_DEFRAG */
1362
1363 static inline IP_t *NetDefragment(IP_t *ip, int *lenp)
1364 {
1365         u16 ip_off = ntohs(ip->ip_off);
1366         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1367                 return ip; /* not a fragment */
1368         return NULL;
1369 }
1370 #endif
1371
1372 /**
1373  * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
1374  * drop others.
1375  *
1376  * @parma ip    IP packet containing the ICMP
1377  */
1378 static void receive_icmp(IP_t *ip, int len, IPaddr_t src_ip, Ethernet_t *et)
1379 {
1380         ICMP_t *icmph = (ICMP_t *)&ip->udp_src;
1381
1382         switch (icmph->type) {
1383         case ICMP_REDIRECT:
1384                 if (icmph->code != ICMP_REDIR_HOST)
1385                         return;
1386                 printf(" ICMP Host Redirect to %pI4 ",
1387                         &icmph->un.gateway);
1388                 break;
1389 #if defined(CONFIG_CMD_PING)
1390         case ICMP_ECHO_REPLY:
1391                 /*
1392                         * IP header OK.  Pass the packet to the
1393                         * current handler.
1394                         */
1395                 /*
1396                  * XXX point to ip packet - should this use
1397                  * packet_icmp_handler?
1398                  */
1399                 (*packetHandler)((uchar *)ip, 0, src_ip, 0, 0);
1400                 break;
1401         case ICMP_ECHO_REQUEST:
1402                 debug("Got ICMP ECHO REQUEST, return %d bytes\n",
1403                         ETHER_HDR_SIZE + len);
1404
1405                 memcpy(&et->et_dest[0], &et->et_src[0], 6);
1406                 memcpy(&et->et_src[0], NetOurEther, 6);
1407
1408                 ip->ip_sum = 0;
1409                 ip->ip_off = 0;
1410                 NetCopyIP((void *)&ip->ip_dst, &ip->ip_src);
1411                 NetCopyIP((void *)&ip->ip_src, &NetOurIP);
1412                 ip->ip_sum = ~NetCksum((uchar *)ip,
1413                                         IP_HDR_SIZE_NO_UDP >> 1);
1414
1415                 icmph->type = ICMP_ECHO_REPLY;
1416                 icmph->checksum = 0;
1417                 icmph->checksum = ~NetCksum((uchar *)icmph,
1418                         (len - IP_HDR_SIZE_NO_UDP) >> 1);
1419                 (void) eth_send((uchar *)et,
1420                                 ETHER_HDR_SIZE + len);
1421                 break;
1422 #endif
1423         default:
1424 #ifdef CONFIG_CMD_TFTPPUT
1425                 if (packet_icmp_handler)
1426                         packet_icmp_handler(icmph->type, icmph->code,
1427                                 ntohs(ip->udp_dst), src_ip, ntohs(ip->udp_src),
1428                                 icmph->un.data, ntohs(ip->udp_len));
1429 #endif
1430                 break;
1431         }
1432 }
1433
1434 void
1435 NetReceive(uchar *inpkt, int len)
1436 {
1437         Ethernet_t *et;
1438         IP_t    *ip;
1439         ARP_t   *arp;
1440         IPaddr_t tmp;
1441         IPaddr_t src_ip;
1442         int     x;
1443         uchar *pkt;
1444 #if defined(CONFIG_CMD_CDP)
1445         int iscdp;
1446 #endif
1447         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1448
1449         debug("packet received\n");
1450
1451         NetRxPacket = inpkt;
1452         NetRxPacketLen = len;
1453         et = (Ethernet_t *)inpkt;
1454
1455         /* too small packet? */
1456         if (len < ETHER_HDR_SIZE)
1457                 return;
1458
1459 #ifdef CONFIG_API
1460         if (push_packet) {
1461                 (*push_packet)(inpkt, len);
1462                 return;
1463         }
1464 #endif
1465
1466 #if defined(CONFIG_CMD_CDP)
1467         /* keep track if packet is CDP */
1468         iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0;
1469 #endif
1470
1471         myvlanid = ntohs(NetOurVLAN);
1472         if (myvlanid == (ushort)-1)
1473                 myvlanid = VLAN_NONE;
1474         mynvlanid = ntohs(NetOurNativeVLAN);
1475         if (mynvlanid == (ushort)-1)
1476                 mynvlanid = VLAN_NONE;
1477
1478         x = ntohs(et->et_protlen);
1479
1480         debug("packet received\n");
1481
1482         if (x < 1514) {
1483                 /*
1484                  *      Got a 802 packet.  Check the other protocol field.
1485                  */
1486                 x = ntohs(et->et_prot);
1487
1488                 ip = (IP_t *)(inpkt + E802_HDR_SIZE);
1489                 len -= E802_HDR_SIZE;
1490
1491         } else if (x != PROT_VLAN) {    /* normal packet */
1492                 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE);
1493                 len -= ETHER_HDR_SIZE;
1494
1495         } else {                        /* VLAN packet */
1496                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et;
1497
1498                 debug("VLAN packet received\n");
1499
1500                 /* too small packet? */
1501                 if (len < VLAN_ETHER_HDR_SIZE)
1502                         return;
1503
1504                 /* if no VLAN active */
1505                 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
1506 #if defined(CONFIG_CMD_CDP)
1507                                 && iscdp == 0
1508 #endif
1509                                 )
1510                         return;
1511
1512                 cti = ntohs(vet->vet_tag);
1513                 vlanid = cti & VLAN_IDMASK;
1514                 x = ntohs(vet->vet_type);
1515
1516                 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE);
1517                 len -= VLAN_ETHER_HDR_SIZE;
1518         }
1519
1520         debug("Receive from protocol 0x%x\n", x);
1521
1522 #if defined(CONFIG_CMD_CDP)
1523         if (iscdp) {
1524                 CDPHandler((uchar *)ip, len);
1525                 return;
1526         }
1527 #endif
1528
1529         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1530                 if (vlanid == VLAN_NONE)
1531                         vlanid = (mynvlanid & VLAN_IDMASK);
1532                 /* not matched? */
1533                 if (vlanid != (myvlanid & VLAN_IDMASK))
1534                         return;
1535         }
1536
1537         switch (x) {
1538
1539         case PROT_ARP:
1540                 /*
1541                  * We have to deal with two types of ARP packets:
1542                  * - REQUEST packets will be answered by sending  our
1543                  *   IP address - if we know it.
1544                  * - REPLY packates are expected only after we asked
1545                  *   for the TFTP server's or the gateway's ethernet
1546                  *   address; so if we receive such a packet, we set
1547                  *   the server ethernet address
1548                  */
1549                 debug("Got ARP\n");
1550
1551                 arp = (ARP_t *)ip;
1552                 if (len < ARP_HDR_SIZE) {
1553                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1554                         return;
1555                 }
1556                 if (ntohs(arp->ar_hrd) != ARP_ETHER)
1557                         return;
1558                 if (ntohs(arp->ar_pro) != PROT_IP)
1559                         return;
1560                 if (arp->ar_hln != 6)
1561                         return;
1562                 if (arp->ar_pln != 4)
1563                         return;
1564
1565                 if (NetOurIP == 0)
1566                         return;
1567
1568                 if (NetReadIP(&arp->ar_data[16]) != NetOurIP)
1569                         return;
1570
1571                 switch (ntohs(arp->ar_op)) {
1572                 case ARPOP_REQUEST:
1573                         /* reply with our IP address */
1574                         debug("Got ARP REQUEST, return our IP\n");
1575                         pkt = (uchar *)et;
1576                         pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
1577                         arp->ar_op = htons(ARPOP_REPLY);
1578                         memcpy(&arp->ar_data[10], &arp->ar_data[0], 6);
1579                         NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
1580                         memcpy(&arp->ar_data[0], NetOurEther, 6);
1581                         NetCopyIP(&arp->ar_data[6], &NetOurIP);
1582                         (void) eth_send((uchar *)et,
1583                                         (pkt - (uchar *)et) + ARP_HDR_SIZE);
1584                         return;
1585
1586                 case ARPOP_REPLY:               /* arp reply */
1587                         /* are we waiting for a reply */
1588                         if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
1589                                 break;
1590
1591 #ifdef CONFIG_KEEP_SERVERADDR
1592                         if (NetServerIP == NetArpWaitPacketIP) {
1593                                 char buf[20];
1594                                 sprintf(buf, "%pM", arp->ar_data);
1595                                 setenv("serveraddr", buf);
1596                         }
1597 #endif
1598
1599                         debug("Got ARP REPLY, set server/gtwy eth addr (%pM)\n",
1600                                 arp->ar_data);
1601
1602                         tmp = NetReadIP(&arp->ar_data[6]);
1603
1604                         /* matched waiting packet's address */
1605                         if (tmp == NetArpWaitReplyIP) {
1606                                 debug("Got it\n");
1607
1608                                 /* save address for later use */
1609                                 memcpy(NetArpWaitPacketMAC,
1610                                        &arp->ar_data[0], 6);
1611
1612 #ifdef CONFIG_NETCONSOLE
1613                                 (*packetHandler)(0, 0, 0, 0, 0);
1614 #endif
1615                                 /* modify header, and transmit it */
1616                                 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->
1617                                         et_dest, NetArpWaitPacketMAC, 6);
1618                                 (void) eth_send(NetArpWaitTxPacket,
1619                                                 NetArpWaitTxPacketSize);
1620
1621                                 /* no arp request pending now */
1622                                 NetArpWaitPacketIP = 0;
1623                                 NetArpWaitTxPacketSize = 0;
1624                                 NetArpWaitPacketMAC = NULL;
1625
1626                         }
1627                         return;
1628                 default:
1629                         debug("Unexpected ARP opcode 0x%x\n",
1630                               ntohs(arp->ar_op));
1631                         return;
1632                 }
1633                 break;
1634
1635 #ifdef CONFIG_CMD_RARP
1636         case PROT_RARP:
1637                 debug("Got RARP\n");
1638                 arp = (ARP_t *)ip;
1639                 if (len < ARP_HDR_SIZE) {
1640                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1641                         return;
1642                 }
1643
1644                 if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
1645                         (ntohs(arp->ar_hrd) != ARP_ETHER)   ||
1646                         (ntohs(arp->ar_pro) != PROT_IP)     ||
1647                         (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
1648
1649                         puts("invalid RARP header\n");
1650                 } else {
1651                         NetCopyIP(&NetOurIP, &arp->ar_data[16]);
1652                         if (NetServerIP == 0)
1653                                 NetCopyIP(&NetServerIP, &arp->ar_data[6]);
1654                         memcpy(NetServerEther, &arp->ar_data[0], 6);
1655
1656                         (*packetHandler)(0, 0, 0, 0, 0);
1657                 }
1658                 break;
1659 #endif
1660         case PROT_IP:
1661                 debug("Got IP\n");
1662                 /* Before we start poking the header, make sure it is there */
1663                 if (len < IP_HDR_SIZE) {
1664                         debug("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE);
1665                         return;
1666                 }
1667                 /* Check the packet length */
1668                 if (len < ntohs(ip->ip_len)) {
1669                         printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
1670                         return;
1671                 }
1672                 len = ntohs(ip->ip_len);
1673                 debug("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
1674
1675                 /* Can't deal with anything except IPv4 */
1676                 if ((ip->ip_hl_v & 0xf0) != 0x40)
1677                         return;
1678                 /* Can't deal with IP options (headers != 20 bytes) */
1679                 if ((ip->ip_hl_v & 0x0f) > 0x05)
1680                         return;
1681                 /* Check the Checksum of the header */
1682                 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
1683                         puts("checksum bad\n");
1684                         return;
1685                 }
1686                 /* If it is not for us, ignore it */
1687                 tmp = NetReadIP(&ip->ip_dst);
1688                 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
1689 #ifdef CONFIG_MCAST_TFTP
1690                         if (Mcast_addr != tmp)
1691 #endif
1692                                 return;
1693                 }
1694                 /* Read source IP address for later use */
1695                 src_ip = NetReadIP(&ip->ip_src);
1696                 /*
1697                  * The function returns the unchanged packet if it's not
1698                  * a fragment, and either the complete packet or NULL if
1699                  * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1700                  */
1701                 ip = NetDefragment(ip, &len);
1702                 if (!ip)
1703                         return;
1704                 /*
1705                  * watch for ICMP host redirects
1706                  *
1707                  * There is no real handler code (yet). We just watch
1708                  * for ICMP host redirect messages. In case anybody
1709                  * sees these messages: please contact me
1710                  * (wd@denx.de), or - even better - send me the
1711                  * necessary fixes :-)
1712                  *
1713                  * Note: in all cases where I have seen this so far
1714                  * it was a problem with the router configuration,
1715                  * for instance when a router was configured in the
1716                  * BOOTP reply, but the TFTP server was on the same
1717                  * subnet. So this is probably a warning that your
1718                  * configuration might be wrong. But I'm not really
1719                  * sure if there aren't any other situations.
1720                  *
1721                  * Simon Glass <sjg@chromium.org>: We get an ICMP when
1722                  * we send a tftp packet to a dead connection, or when
1723                  * there is no server at the other end.
1724                  */
1725                 if (ip->ip_p == IPPROTO_ICMP) {
1726                         receive_icmp(ip, len, src_ip, et);
1727                         return;
1728                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1729                         return;
1730                 }
1731
1732 #ifdef CONFIG_UDP_CHECKSUM
1733                 if (ip->udp_xsum != 0) {
1734                         ulong   xsum;
1735                         ushort *sumptr;
1736                         ushort  sumlen;
1737
1738                         xsum  = ip->ip_p;
1739                         xsum += (ntohs(ip->udp_len));
1740                         xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
1741                         xsum += (ntohl(ip->ip_src) >>  0) & 0x0000ffff;
1742                         xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
1743                         xsum += (ntohl(ip->ip_dst) >>  0) & 0x0000ffff;
1744
1745                         sumlen = ntohs(ip->udp_len);
1746                         sumptr = (ushort *) &(ip->udp_src);
1747
1748                         while (sumlen > 1) {
1749                                 ushort sumdata;
1750
1751                                 sumdata = *sumptr++;
1752                                 xsum += ntohs(sumdata);
1753                                 sumlen -= 2;
1754                         }
1755                         if (sumlen > 0) {
1756                                 ushort sumdata;
1757
1758                                 sumdata = *(unsigned char *) sumptr;
1759                                 sumdata = (sumdata << 8) & 0xff00;
1760                                 xsum += sumdata;
1761                         }
1762                         while ((xsum >> 16) != 0) {
1763                                 xsum = (xsum & 0x0000ffff) +
1764                                        ((xsum >> 16) & 0x0000ffff);
1765                         }
1766                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1767                                 printf(" UDP wrong checksum %08lx %08x\n",
1768                                         xsum, ntohs(ip->udp_xsum));
1769                                 return;
1770                         }
1771                 }
1772 #endif
1773
1774
1775 #ifdef CONFIG_NETCONSOLE
1776                 nc_input_packet((uchar *)ip + IP_HDR_SIZE,
1777                                                 ntohs(ip->udp_dst),
1778                                                 ntohs(ip->udp_src),
1779                                                 ntohs(ip->udp_len) - 8);
1780 #endif
1781                 /*
1782                  *      IP header OK.  Pass the packet to the current handler.
1783                  */
1784                 (*packetHandler)((uchar *)ip + IP_HDR_SIZE,
1785                                                 ntohs(ip->udp_dst),
1786                                                 src_ip,
1787                                                 ntohs(ip->udp_src),
1788                                                 ntohs(ip->udp_len) - 8);
1789                 break;
1790         }
1791 }
1792
1793
1794 /**********************************************************************/
1795
1796 static int net_check_prereq(enum proto_t protocol)
1797 {
1798         switch (protocol) {
1799                 /* Fall through */
1800 #if defined(CONFIG_CMD_PING)
1801         case PING:
1802                 if (NetPingIP == 0) {
1803                         puts("*** ERROR: ping address not given\n");
1804                         return 1;
1805                 }
1806                 goto common;
1807 #endif
1808 #if defined(CONFIG_CMD_SNTP)
1809         case SNTP:
1810                 if (NetNtpServerIP == 0) {
1811                         puts("*** ERROR: NTP server address not given\n");
1812                         return 1;
1813                 }
1814                 goto common;
1815 #endif
1816 #if defined(CONFIG_CMD_DNS)
1817         case DNS:
1818                 if (NetOurDNSIP == 0) {
1819                         puts("*** ERROR: DNS server address not given\n");
1820                         return 1;
1821                 }
1822                 goto common;
1823 #endif
1824 #if defined(CONFIG_CMD_NFS)
1825         case NFS:
1826 #endif
1827         case TFTPGET:
1828         case TFTPPUT:
1829                 if (NetServerIP == 0) {
1830                         puts("*** ERROR: `serverip' not set\n");
1831                         return 1;
1832                 }
1833 #if     defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
1834         defined(CONFIG_CMD_DNS)
1835 common:
1836 #endif
1837                 /* Fall through */
1838
1839         case NETCONS:
1840         case TFTPSRV:
1841                 if (NetOurIP == 0) {
1842                         puts("*** ERROR: `ipaddr' not set\n");
1843                         return 1;
1844                 }
1845                 /* Fall through */
1846
1847 #ifdef CONFIG_CMD_RARP
1848         case RARP:
1849 #endif
1850         case BOOTP:
1851         case CDP:
1852         case DHCP:
1853                 if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
1854                         int num = eth_get_dev_index();
1855
1856                         switch (num) {
1857                         case -1:
1858                                 puts("*** ERROR: No ethernet found.\n");
1859                                 return 1;
1860                         case 0:
1861                                 puts("*** ERROR: `ethaddr' not set\n");
1862                                 break;
1863                         default:
1864                                 printf("*** ERROR: `eth%daddr' not set\n",
1865                                         num);
1866                                 break;
1867                         }
1868
1869                         NetStartAgain();
1870                         return 2;
1871                 }
1872                 /* Fall through */
1873         default:
1874                 return 0;
1875         }
1876         return 0;               /* OK */
1877 }
1878 /**********************************************************************/
1879
1880 int
1881 NetCksumOk(uchar *ptr, int len)
1882 {
1883         return !((NetCksum(ptr, len) + 1) & 0xfffe);
1884 }
1885
1886
1887 unsigned
1888 NetCksum(uchar *ptr, int len)
1889 {
1890         ulong   xsum;
1891         ushort *p = (ushort *)ptr;
1892
1893         xsum = 0;
1894         while (len-- > 0)
1895                 xsum += *p++;
1896         xsum = (xsum & 0xffff) + (xsum >> 16);
1897         xsum = (xsum & 0xffff) + (xsum >> 16);
1898         return xsum & 0xffff;
1899 }
1900
1901 int
1902 NetEthHdrSize(void)
1903 {
1904         ushort myvlanid;
1905
1906         myvlanid = ntohs(NetOurVLAN);
1907         if (myvlanid == (ushort)-1)
1908                 myvlanid = VLAN_NONE;
1909
1910         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1911                 VLAN_ETHER_HDR_SIZE;
1912 }
1913
1914 int
1915 NetSetEther(uchar *xet, uchar * addr, uint prot)
1916 {
1917         Ethernet_t *et = (Ethernet_t *)xet;
1918         ushort myvlanid;
1919
1920         myvlanid = ntohs(NetOurVLAN);
1921         if (myvlanid == (ushort)-1)
1922                 myvlanid = VLAN_NONE;
1923
1924         memcpy(et->et_dest, addr, 6);
1925         memcpy(et->et_src, NetOurEther, 6);
1926         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1927                 et->et_protlen = htons(prot);
1928                 return ETHER_HDR_SIZE;
1929         } else {
1930                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet;
1931
1932                 vet->vet_vlan_type = htons(PROT_VLAN);
1933                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1934                 vet->vet_type = htons(prot);
1935                 return VLAN_ETHER_HDR_SIZE;
1936         }
1937 }
1938
1939 void
1940 NetSetIP(uchar *xip, IPaddr_t dest, int dport, int sport, int len)
1941 {
1942         IP_t *ip = (IP_t *)xip;
1943
1944         /*
1945          *      If the data is an odd number of bytes, zero the
1946          *      byte after the last byte so that the checksum
1947          *      will work.
1948          */
1949         if (len & 1)
1950                 xip[IP_HDR_SIZE + len] = 0;
1951
1952         /*
1953          *      Construct an IP and UDP header.
1954          *      (need to set no fragment bit - XXX)
1955          */
1956         /* IP_HDR_SIZE / 4 (not including UDP) */
1957         ip->ip_hl_v  = 0x45;
1958         ip->ip_tos   = 0;
1959         ip->ip_len   = htons(IP_HDR_SIZE + len);
1960         ip->ip_id    = htons(NetIPID++);
1961         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1962         ip->ip_ttl   = 255;
1963         ip->ip_p     = 17;              /* UDP */
1964         ip->ip_sum   = 0;
1965         /* already in network byte order */
1966         NetCopyIP((void *)&ip->ip_src, &NetOurIP);
1967         /* - "" - */
1968         NetCopyIP((void *)&ip->ip_dst, &dest);
1969         ip->udp_src  = htons(sport);
1970         ip->udp_dst  = htons(dport);
1971         ip->udp_len  = htons(8 + len);
1972         ip->udp_xsum = 0;
1973         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
1974 }
1975
1976 void copy_filename(char *dst, const char *src, int size)
1977 {
1978         if (*src && (*src == '"')) {
1979                 ++src;
1980                 --size;
1981         }
1982
1983         while ((--size > 0) && *src && (*src != '"'))
1984                 *dst++ = *src++;
1985         *dst = '\0';
1986 }
1987
1988 #if     defined(CONFIG_CMD_NFS)         || \
1989         defined(CONFIG_CMD_SNTP)        || \
1990         defined(CONFIG_CMD_DNS)
1991 /*
1992  * make port a little random (1024-17407)
1993  * This keeps the math somewhat trivial to compute, and seems to work with
1994  * all supported protocols/clients/servers
1995  */
1996 unsigned int random_port(void)
1997 {
1998         return 1024 + (get_timer(0) % 0x4000);
1999 }
2000 #endif
2001
2002 void ip_to_string(IPaddr_t x, char *s)
2003 {
2004         x = ntohl(x);
2005         sprintf(s, "%d.%d.%d.%d",
2006                 (int) ((x >> 24) & 0xff),
2007                 (int) ((x >> 16) & 0xff),
2008                 (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
2009         );
2010 }
2011
2012 void VLAN_to_string(ushort x, char *s)
2013 {
2014         x = ntohs(x);
2015
2016         if (x == (ushort)-1)
2017                 x = VLAN_NONE;
2018
2019         if (x == VLAN_NONE)
2020                 strcpy(s, "none");
2021         else
2022                 sprintf(s, "%d", x & VLAN_IDMASK);
2023 }
2024
2025 ushort string_to_VLAN(const char *s)
2026 {
2027         ushort id;
2028
2029         if (s == NULL)
2030                 return htons(VLAN_NONE);
2031
2032         if (*s < '0' || *s > '9')
2033                 id = VLAN_NONE;
2034         else
2035                 id = (ushort)simple_strtoul(s, NULL, 10);
2036
2037         return htons(id);
2038 }
2039
2040 ushort getenv_VLAN(char *var)
2041 {
2042         return string_to_VLAN(getenv(var));
2043 }