net/net.c

   1 /*
   2  *      Copied from Linux Monitor (LiMon) - Networking.
   3  *
   4  *      Copyright 1994 - 2000 Neil Russell.
   5  *      (See License)
   6  *      Copyright 2000 Roland Borde
   7  *      Copyright 2000 Paolo Scaffardi
   8  *      Copyright 2000-2002 Wolfgang Denk, wd@denx.de
   9  */
  10
  11 /*
  12  * General Desription:
  13  *
  14  * The user interface supports commands for BOOTP, RARP, and TFTP.
  15  * Also, we support ARP internally. Depending on available data,
  16  * these interact as follows:
  17  *
  18  * BOOTP:
  19  *
  20  *      Prerequisites:  - own ethernet address
  21  *      We want:        - own IP address
  22  *                      - TFTP server IP address
  23  *                      - name of bootfile
  24  *      Next step:      ARP
  25  *
  26  * RARP:
  27  *
  28  *      Prerequisites:  - own ethernet address
  29  *      We want:        - own IP address
  30  *                      - TFTP server IP address
  31  *      Next step:      ARP
  32  *
  33  * ARP:
  34  *
  35  *      Prerequisites:  - own ethernet address
  36  *                      - own IP address
  37  *                      - TFTP server IP address
  38  *      We want:        - TFTP server ethernet address
  39  *      Next step:      TFTP
  40  *
  41  * DHCP:
  42  *
  43  *     Prerequisites:   - own ethernet address
  44  *     We want:         - IP, Netmask, ServerIP, Gateway IP
  45  *                      - bootfilename, lease time
  46  *     Next step:       - TFTP
  47  *
  48  * TFTP:
  49  *
  50  *      Prerequisites:  - own ethernet address
  51  *                      - own IP address
  52  *                      - TFTP server IP address
  53  *                      - TFTP server ethernet address
  54  *                      - name of bootfile (if unknown, we use a default name
  55  *                        derived from our own IP address)
  56  *      We want:        - load the boot file
  57  *      Next step:      none
  58  *
  59  * NFS:
  60  *
  61  *      Prerequisites:  - own ethernet address
  62  *                      - own IP address
  63  *                      - name of bootfile (if unknown, we use a default name
  64  *                        derived from our own IP address)
  65  *      We want:        - load the boot file
  66  *      Next step:      none
  67  *
  68  * SNTP:
  69  *
  70  *      Prerequisites:  - own ethernet address
  71  *                      - own IP address
  72  *      We want:        - network time
  73  *      Next step:      none
  74  */
  75
  76
  77 #include <common.h>
  78 #include <watchdog.h>
  79 #include <command.h>
  80 #include <net.h>
  81 #include "bootp.h"
  82 #include "tftp.h"
  83 #ifdef CONFIG_CMD_RARP
  84 #include "rarp.h"
  85 #endif
  86 #include "nfs.h"
  87 #ifdef CONFIG_STATUS_LED
  88 #include <status_led.h>
  89 #include <miiphy.h>
  90 #endif
  91 #if defined(CONFIG_CMD_SNTP)
  92 #include "sntp.h"
  93 #endif
  94 #if defined(CONFIG_CDP_VERSION)
  95 #include <timestamp.h>
  96 #endif
  97 #if defined(CONFIG_CMD_DNS)
  98 #include "dns.h"
  99 #endif
 100
 101 DECLARE_GLOBAL_DATA_PTR;
 102
 103 #ifndef CONFIG_ARP_TIMEOUT
 104 /* Milliseconds before trying ARP again */
 105 # define ARP_TIMEOUT            5000UL
 106 #else
 107 # define ARP_TIMEOUT            CONFIG_ARP_TIMEOUT
 108 #endif
 109
 110
 111 #ifndef CONFIG_NET_RETRY_COUNT
 112 # define ARP_TIMEOUT_COUNT      5       /* # of timeouts before giving up  */
 113 #else
 114 # define ARP_TIMEOUT_COUNT      CONFIG_NET_RETRY_COUNT
 115 #endif
 116
 117 /** BOOTP EXTENTIONS **/
 118
 119 /* Our subnet mask (0=unknown) */
 120 IPaddr_t        NetOurSubnetMask;
 121 /* Our gateways IP address */
 122 IPaddr_t        NetOurGatewayIP;
 123 /* Our DNS IP address */
 124 IPaddr_t        NetOurDNSIP;
 125 #if defined(CONFIG_BOOTP_DNS2)
 126 /* Our 2nd DNS IP address */
 127 IPaddr_t        NetOurDNS2IP;
 128 #endif
 129 /* Our NIS domain */
 130 char            NetOurNISDomain[32] = {0,};
 131 /* Our hostname */
 132 char            NetOurHostName[32] = {0,};
 133 /* Our bootpath */
 134 char            NetOurRootPath[64] = {0,};
 135 /* Our bootfile size in blocks */
 136 ushort          NetBootFileSize;
 137
 138 #ifdef CONFIG_MCAST_TFTP        /* Multicast TFTP */
 139 IPaddr_t Mcast_addr;
 140 #endif
 141
 142 /** END OF BOOTP EXTENTIONS **/
 143
 144 /* The actual transferred size of the bootfile (in bytes) */
 145 ulong           NetBootFileXferSize;
 146 /* Our ethernet address */
 147 uchar           NetOurEther[6];
 148 /* Boot server enet address */
 149 uchar           NetServerEther[6];
 150 /* Our IP addr (0 = unknown) */
 151 IPaddr_t        NetOurIP;
 152 /* Server IP addr (0 = unknown) */
 153 IPaddr_t        NetServerIP;
 154 /* Current receive packet */
 155 volatile uchar *NetRxPacket;
 156 /* Current rx packet length */
 157 int             NetRxPacketLen;
 158 /* IP packet ID */
 159 unsigned        NetIPID;
 160 /* Ethernet bcast address */
 161 uchar           NetBcastAddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 162 uchar           NetEtherNullAddr[6];
 163 #ifdef CONFIG_API
 164 void            (*push_packet)(volatile void *, int len) = 0;
 165 #endif
 166 #if defined(CONFIG_CMD_CDP)
 167 /* Ethernet bcast address */
 168 uchar           NetCDPAddr[6] = { 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc };
 169 #endif
 170 /* Network loop state */
 171 int             NetState;
 172 /* Tried all network devices */
 173 int             NetRestartWrap;
 174 /* Network loop restarted */
 175 static int      NetRestarted;
 176 /* At least one device configured */
 177 static int      NetDevExists;
 178
 179 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
 180 /* default is without VLAN */
 181 ushort          NetOurVLAN = 0xFFFF;
 182 /* ditto */
 183 ushort          NetOurNativeVLAN = 0xFFFF;
 184
 185 /* Boot File name */
 186 char            BootFile[128];
 187
 188 #if defined(CONFIG_CMD_PING)
 189 /* the ip address to ping */
 190 IPaddr_t        NetPingIP;
 191
 192 static void PingStart(void);
 193 #endif
 194
 195 #if defined(CONFIG_CMD_CDP)
 196 static void CDPStart(void);
 197 #endif
 198
 199 #if defined(CONFIG_CMD_SNTP)
 200 /* NTP server IP address */
 201 IPaddr_t        NetNtpServerIP;
 202 /* offset time from UTC */
 203 int             NetTimeOffset;
 204 #endif
 205
 206 #ifdef CONFIG_NETCONSOLE
 207 void NcStart(void);
 208 int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len);
 209 #endif
 210
 211 volatile uchar  PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 212
 213 /* Receive packet */
 214 volatile uchar *NetRxPackets[PKTBUFSRX];
 215
 216 /* Current RX packet handler */
 217 static rxhand_f *packetHandler;
 218 #ifdef CONFIG_CMD_TFTPPUT
 219 static rxhand_icmp_f *packet_icmp_handler;      /* Current ICMP rx handler */
 220 #endif
 221 /* Current timeout handler */
 222 static thand_f *timeHandler;
 223 /* Time base value */
 224 static ulong    timeStart;
 225 /* Current timeout value */
 226 static ulong    timeDelta;
 227 /* THE transmit packet */
 228 volatile uchar *NetTxPacket;
 229
 230 static int net_check_prereq(enum proto_t protocol);
 231
 232 static int NetTryCount;
 233
 234 /**********************************************************************/
 235
 236 IPaddr_t        NetArpWaitPacketIP;
 237 IPaddr_t        NetArpWaitReplyIP;
 238 /* MAC address of waiting packet's destination */
 239 uchar          *NetArpWaitPacketMAC;
 240 /* THE transmit packet */
 241 uchar          *NetArpWaitTxPacket;
 242 int             NetArpWaitTxPacketSize;
 243 uchar           NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
 244 ulong           NetArpWaitTimerStart;
 245 int             NetArpWaitTry;
 246
 247 void ArpRequest(void)
 248 {
 249         volatile uchar *pkt;
 250         ARP_t *arp;
 251
 252         debug("ARP broadcast %d\n", NetArpWaitTry);
 253
 254         pkt = NetTxPacket;
 255
 256         pkt += NetSetEther(pkt, NetBcastAddr, PROT_ARP);
 257
 258         arp = (ARP_t *) pkt;
 259
 260         arp->ar_hrd = htons(ARP_ETHER);
 261         arp->ar_pro = htons(PROT_IP);
 262         arp->ar_hln = 6;
 263         arp->ar_pln = 4;
 264         arp->ar_op = htons(ARPOP_REQUEST);
 265
 266         /* source ET addr */
 267         memcpy(&arp->ar_data[0], NetOurEther, 6);
 268         /* source IP addr */
 269         NetWriteIP((uchar *) &arp->ar_data[6], NetOurIP);
 270         /* dest ET addr = 0 */
 271         memset(&arp->ar_data[10], '\0', 6);
 272         if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
 273             (NetOurIP & NetOurSubnetMask)) {
 274                 if (NetOurGatewayIP == 0) {
 275                         puts("## Warning: gatewayip needed but not set\n");
 276                         NetArpWaitReplyIP = NetArpWaitPacketIP;
 277                 } else {
 278                         NetArpWaitReplyIP = NetOurGatewayIP;
 279                 }
 280         } else {
 281                 NetArpWaitReplyIP = NetArpWaitPacketIP;
 282         }
 283
 284         NetWriteIP((uchar *) &arp->ar_data[16], NetArpWaitReplyIP);
 285         (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
 286 }
 287
 288 void ArpTimeoutCheck(void)
 289 {
 290         ulong t;
 291
 292         if (!NetArpWaitPacketIP)
 293                 return;
 294
 295         t = get_timer(0);
 296
 297         /* check for arp timeout */
 298         if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT) {
 299                 NetArpWaitTry++;
 300
 301                 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
 302                         puts("\nARP Retry count exceeded; starting again\n");
 303                         NetArpWaitTry = 0;
 304                         NetStartAgain();
 305                 } else {
 306                         NetArpWaitTimerStart = t;
 307                         ArpRequest();
 308                 }
 309         }
 310 }
 311
 312 /*
 313  * Check if autoload is enabled. If so, use either NFS or TFTP to download
 314  * the boot file.
 315  */
 316 void net_auto_load(void)
 317 {
 318         const char *s = getenv("autoload");
 319
 320         if (s != NULL) {
 321                 if (*s == 'n') {
 322                         /*
 323                          * Just use BOOTP/RARP to configure system;
 324                          * Do not use TFTP to load the bootfile.
 325                          */
 326                         NetState = NETLOOP_SUCCESS;
 327                         return;
 328                 }
 329 #if defined(CONFIG_CMD_NFS)
 330                 if (strcmp(s, "NFS") == 0) {
 331                         /*
 332                          * Use NFS to load the bootfile.
 333                          */
 334                         NfsStart();
 335                         return;
 336                 }
 337 #endif
 338         }
 339         TftpStart(TFTPGET);
 340 }
 341
 342 static void NetInitLoop(enum proto_t protocol)
 343 {
 344         static int env_changed_id;
 345         bd_t *bd = gd->bd;
 346         int env_id = get_env_id();
 347
 348         /* update only when the environment has changed */
 349         if (env_changed_id != env_id) {
 350                 NetOurIP = getenv_IPaddr("ipaddr");
 351                 NetCopyIP(&bd->bi_ip_addr, &NetOurIP);
 352                 NetOurGatewayIP = getenv_IPaddr("gatewayip");
 353                 NetOurSubnetMask = getenv_IPaddr("netmask");
 354                 NetServerIP = getenv_IPaddr("serverip");
 355                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 356                 NetOurVLAN = getenv_VLAN("vlan");
 357 #if defined(CONFIG_CMD_DNS)
 358                 NetOurDNSIP = getenv_IPaddr("dnsip");
 359 #endif
 360                 env_changed_id = env_id;
 361         }
 362
 363         return;
 364 }
 365
 366 /**********************************************************************/
 367 /*
 368  *      Main network processing loop.
 369  */
 370
 371 int NetLoop(enum proto_t protocol)
 372 {
 373         bd_t *bd = gd->bd;
 374         int ret = -1;
 375
 376         NetRestarted = 0;
 377         NetDevExists = 0;
 378
 379         /* XXX problem with bss workaround */
 380         NetArpWaitPacketMAC = NULL;
 381         NetArpWaitTxPacket = NULL;
 382         NetArpWaitPacketIP = 0;
 383         NetArpWaitReplyIP = 0;
 384         NetArpWaitTxPacket = NULL;
 385         NetTxPacket = NULL;
 386         NetTryCount = 1;
 387
 388         if (!NetTxPacket) {
 389                 int     i;
 390                 /*
 391                  *      Setup packet buffers, aligned correctly.
 392                  */
 393                 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
 394                 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
 395                 for (i = 0; i < PKTBUFSRX; i++)
 396                         NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
 397         }
 398
 399         if (!NetArpWaitTxPacket) {
 400                 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
 401                 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
 402                 NetArpWaitTxPacketSize = 0;
 403         }
 404
 405         bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
 406         eth_halt();
 407         eth_set_current();
 408         if (eth_init(bd) < 0) {
 409                 eth_halt();
 410                 return -1;
 411         }
 412
 413 restart:
 414         memcpy(NetOurEther, eth_get_dev()->enetaddr, 6);
 415
 416         NetState = NETLOOP_CONTINUE;
 417
 418         /*
 419          *      Start the ball rolling with the given start function.  From
 420          *      here on, this code is a state machine driven by received
 421          *      packets and timer events.
 422          */
 423         NetInitLoop(protocol);
 424
 425         switch (net_check_prereq(protocol)) {
 426         case 1:
 427                 /* network not configured */
 428                 eth_halt();
 429                 return -1;
 430
 431         case 2:
 432                 /* network device not configured */
 433                 break;
 434
 435         case 0:
 436                 NetDevExists = 1;
 437                 NetBootFileXferSize = 0;
 438                 switch (protocol) {
 439                 case TFTPGET:
 440 #ifdef CONFIG_CMD_TFTPPUT
 441                 case TFTPPUT:
 442 #endif
 443                         /* always use ARP to get server ethernet address */
 444                         TftpStart(protocol);
 445                         break;
 446 #ifdef CONFIG_CMD_TFTPSRV
 447                 case TFTPSRV:
 448                         TftpStartServer();
 449                         break;
 450 #endif
 451 #if defined(CONFIG_CMD_DHCP)
 452                 case DHCP:
 453                         BootpTry = 0;
 454                         NetOurIP = 0;
 455                         DhcpRequest();          /* Basically same as BOOTP */
 456                         break;
 457 #endif
 458
 459                 case BOOTP:
 460                         BootpTry = 0;
 461                         NetOurIP = 0;
 462                         BootpRequest();
 463                         break;
 464
 465 #if defined(CONFIG_CMD_RARP)
 466                 case RARP:
 467                         RarpTry = 0;
 468                         NetOurIP = 0;
 469                         RarpRequest();
 470                         break;
 471 #endif
 472 #if defined(CONFIG_CMD_PING)
 473                 case PING:
 474                         PingStart();
 475                         break;
 476 #endif
 477 #if defined(CONFIG_CMD_NFS)
 478                 case NFS:
 479                         NfsStart();
 480                         break;
 481 #endif
 482 #if defined(CONFIG_CMD_CDP)
 483                 case CDP:
 484                         CDPStart();
 485                         break;
 486 #endif
 487 #ifdef CONFIG_NETCONSOLE
 488                 case NETCONS:
 489                         NcStart();
 490                         break;
 491 #endif
 492 #if defined(CONFIG_CMD_SNTP)
 493                 case SNTP:
 494                         SntpStart();
 495                         break;
 496 #endif
 497 #if defined(CONFIG_CMD_DNS)
 498                 case DNS:
 499                         DnsStart();
 500                         break;
 501 #endif
 502                 default:
 503                         break;
 504                 }
 505
 506                 break;
 507         }
 508
 509 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 510 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 511         defined(CONFIG_STATUS_LED)                      && \
 512         defined(STATUS_LED_RED)
 513         /*
 514          * Echo the inverted link state to the fault LED.
 515          */
 516         if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
 517                 status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
 518         else
 519                 status_led_set(STATUS_LED_RED, STATUS_LED_ON);
 520 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 521 #endif /* CONFIG_MII, ... */
 522
 523         /*
 524          *      Main packet reception loop.  Loop receiving packets until
 525          *      someone sets `NetState' to a state that terminates.
 526          */
 527         for (;;) {
 528                 WATCHDOG_RESET();
 529 #ifdef CONFIG_SHOW_ACTIVITY
 530                 {
 531                         extern void show_activity(int arg);
 532                         show_activity(1);
 533                 }
 534 #endif
 535                 /*
 536                  *      Check the ethernet for a new packet.  The ethernet
 537                  *      receive routine will process it.
 538                  */
 539                 eth_rx();
 540
 541                 /*
 542                  *      Abort if ctrl-c was pressed.
 543                  */
 544                 if (ctrlc()) {
 545                         eth_halt();
 546                         puts("\nAbort\n");
 547                         goto done;
 548                 }
 549
 550                 ArpTimeoutCheck();
 551
 552                 /*
 553                  *      Check for a timeout, and run the timeout handler
 554                  *      if we have one.
 555                  */
 556                 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
 557                         thand_f *x;
 558
 559 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 560 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 561         defined(CONFIG_STATUS_LED)                      && \
 562         defined(STATUS_LED_RED)
 563                         /*
 564                          * Echo the inverted link state to the fault LED.
 565                          */
 566                         if (miiphy_link(eth_get_dev()->name,
 567                                        CONFIG_SYS_FAULT_MII_ADDR)) {
 568                                 status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
 569                         } else {
 570                                 status_led_set(STATUS_LED_RED, STATUS_LED_ON);
 571                         }
 572 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 573 #endif /* CONFIG_MII, ... */
 574                         x = timeHandler;
 575                         timeHandler = (thand_f *)0;
 576                         (*x)();
 577                 }
 578
 579
 580                 switch (NetState) {
 581
 582                 case NETLOOP_RESTART:
 583                         NetRestarted = 1;
 584                         goto restart;
 585
 586                 case NETLOOP_SUCCESS:
 587                         if (NetBootFileXferSize > 0) {
 588                                 char buf[20];
 589                                 printf("Bytes transferred = %ld (%lx hex)\n",
 590                                         NetBootFileXferSize,
 591                                         NetBootFileXferSize);
 592                                 sprintf(buf, "%lX", NetBootFileXferSize);
 593                                 setenv("filesize", buf);
 594
 595                                 sprintf(buf, "%lX", (unsigned long)load_addr);
 596                                 setenv("fileaddr", buf);
 597                         }
 598                         eth_halt();
 599                         ret = NetBootFileXferSize;
 600                         goto done;
 601
 602                 case NETLOOP_FAIL:
 603                         goto done;
 604                 }
 605         }
 606
 607 done:
 608 #ifdef CONFIG_CMD_TFTPPUT
 609         /* Clear out the handlers */
 610         NetSetHandler(NULL);
 611         net_set_icmp_handler(NULL);
 612 #endif
 613         return ret;
 614 }
 615
 616 /**********************************************************************/
 617
 618 static void
 619 startAgainTimeout(void)
 620 {
 621         NetState = NETLOOP_RESTART;
 622 }
 623
 624 static void
 625 startAgainHandler(uchar *pkt, unsigned dest, IPaddr_t sip,
 626                   unsigned src, unsigned len)
 627 {
 628         /* Totally ignore the packet */
 629 }
 630
 631 void NetStartAgain(void)
 632 {
 633         char *nretry;
 634         int retry_forever = 0;
 635         unsigned long retrycnt = 0;
 636
 637         nretry = getenv("netretry");
 638         if (nretry) {
 639                 if (!strcmp(nretry, "yes"))
 640                         retry_forever = 1;
 641                 else if (!strcmp(nretry, "no"))
 642                         retrycnt = 0;
 643                 else if (!strcmp(nretry, "once"))
 644                         retrycnt = 1;
 645                 else
 646                         retrycnt = simple_strtoul(nretry, NULL, 0);
 647         } else
 648                 retry_forever = 1;
 649
 650         if ((!retry_forever) && (NetTryCount >= retrycnt)) {
 651                 eth_halt();
 652                 NetState = NETLOOP_FAIL;
 653                 return;
 654         }
 655
 656         NetTryCount++;
 657
 658         eth_halt();
 659 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
 660         eth_try_another(!NetRestarted);
 661 #endif
 662         eth_init(gd->bd);
 663         if (NetRestartWrap) {
 664                 NetRestartWrap = 0;
 665                 if (NetDevExists) {
 666                         NetSetTimeout(10000UL, startAgainTimeout);
 667                         NetSetHandler(startAgainHandler);
 668                 } else {
 669                         NetState = NETLOOP_FAIL;
 670                 }
 671         } else {
 672                 NetState = NETLOOP_RESTART;
 673         }
 674 }
 675
 676 /**********************************************************************/
 677 /*
 678  *      Miscelaneous bits.
 679  */
 680
 681 void
 682 NetSetHandler(rxhand_f *f)
 683 {
 684         packetHandler = f;
 685 }
 686
 687 #ifdef CONFIG_CMD_TFTPPUT
 688 void net_set_icmp_handler(rxhand_icmp_f *f)
 689 {
 690         packet_icmp_handler = f;
 691 }
 692 #endif
 693
 694 void
 695 NetSetTimeout(ulong iv, thand_f *f)
 696 {
 697         if (iv == 0) {
 698                 timeHandler = (thand_f *)0;
 699         } else {
 700                 timeHandler = f;
 701                 timeStart = get_timer(0);
 702                 timeDelta = iv;
 703         }
 704 }
 705
 706
 707 void
 708 NetSendPacket(volatile uchar *pkt, int len)
 709 {
 710         (void) eth_send(pkt, len);
 711 }
 712
 713 int
 714 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
 715 {
 716         uchar *pkt;
 717
 718         /* convert to new style broadcast */
 719         if (dest == 0)
 720                 dest = 0xFFFFFFFF;
 721
 722         /* if broadcast, make the ether address a broadcast and don't do ARP */
 723         if (dest == 0xFFFFFFFF)
 724                 ether = NetBcastAddr;
 725
 726         /*
 727          * if MAC address was not discovered yet, save the packet and do
 728          * an ARP request
 729          */
 730         if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
 731
 732                 debug("sending ARP for %08x\n", dest);
 733
 734                 NetArpWaitPacketIP = dest;
 735                 NetArpWaitPacketMAC = ether;
 736
 737                 pkt = NetArpWaitTxPacket;
 738                 pkt += NetSetEther(pkt, NetArpWaitPacketMAC, PROT_IP);
 739
 740                 NetSetIP(pkt, dest, dport, sport, len);
 741                 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket +
 742                        (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len);
 743
 744                 /* size of the waiting packet */
 745                 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) +
 746                         IP_HDR_SIZE + len;
 747
 748                 /* and do the ARP request */
 749                 NetArpWaitTry = 1;
 750                 NetArpWaitTimerStart = get_timer(0);
 751                 ArpRequest();
 752                 return 1;       /* waiting */
 753         }
 754
 755         debug("sending UDP to %08x/%pM\n", dest, ether);
 756
 757         pkt = (uchar *)NetTxPacket;
 758         pkt += NetSetEther(pkt, ether, PROT_IP);
 759         NetSetIP(pkt, dest, dport, sport, len);
 760         (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len);
 761
 762         return 0;       /* transmitted */
 763 }
 764
 765 #if defined(CONFIG_CMD_PING)
 766 static ushort PingSeqNo;
 767
 768 int PingSend(void)
 769 {
 770         static uchar mac[6];
 771         volatile IP_t *ip;
 772         volatile ushort *s;
 773         uchar *pkt;
 774
 775         /* XXX always send arp request */
 776
 777         memcpy(mac, NetEtherNullAddr, 6);
 778
 779         debug("sending ARP for %08x\n", NetPingIP);
 780
 781         NetArpWaitPacketIP = NetPingIP;
 782         NetArpWaitPacketMAC = mac;
 783
 784         pkt = NetArpWaitTxPacket;
 785         pkt += NetSetEther(pkt, mac, PROT_IP);
 786
 787         ip = (volatile IP_t *)pkt;
 788
 789         /*
 790          * Construct an IP and ICMP header.
 791          * (need to set no fragment bit - XXX)
 792          */
 793         /* IP_HDR_SIZE / 4 (not including UDP) */
 794         ip->ip_hl_v  = 0x45;
 795         ip->ip_tos   = 0;
 796         ip->ip_len   = htons(IP_HDR_SIZE_NO_UDP + 8);
 797         ip->ip_id    = htons(NetIPID++);
 798         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
 799         ip->ip_ttl   = 255;
 800         ip->ip_p     = 0x01;            /* ICMP */
 801         ip->ip_sum   = 0;
 802         /* already in network byte order */
 803         NetCopyIP((void *)&ip->ip_src, &NetOurIP);
 804         /* - "" - */
 805         NetCopyIP((void *)&ip->ip_dst, &NetPingIP);
 806         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
 807
 808         s = &ip->udp_src;               /* XXX ICMP starts here */
 809         s[0] = htons(0x0800);           /* echo-request, code */
 810         s[1] = 0;                       /* checksum */
 811         s[2] = 0;                       /* identifier */
 812         s[3] = htons(PingSeqNo++);      /* sequence number */
 813         s[1] = ~NetCksum((uchar *)s, 8/2);
 814
 815         /* size of the waiting packet */
 816         NetArpWaitTxPacketSize =
 817                 (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8;
 818
 819         /* and do the ARP request */
 820         NetArpWaitTry = 1;
 821         NetArpWaitTimerStart = get_timer(0);
 822         ArpRequest();
 823         return 1;       /* waiting */
 824 }
 825
 826 static void
 827 PingTimeout(void)
 828 {
 829         eth_halt();
 830         NetState = NETLOOP_FAIL;        /* we did not get the reply */
 831 }
 832
 833 static void
 834 PingHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
 835             unsigned len)
 836 {
 837         if (sip != NetPingIP)
 838                 return;
 839
 840         NetState = NETLOOP_SUCCESS;
 841 }
 842
 843 static void PingStart(void)
 844 {
 845         printf("Using %s device\n", eth_get_name());
 846         NetSetTimeout(10000UL, PingTimeout);
 847         NetSetHandler(PingHandler);
 848
 849         PingSend();
 850 }
 851 #endif
 852
 853 #if defined(CONFIG_CMD_CDP)
 854
 855 #define CDP_DEVICE_ID_TLV               0x0001
 856 #define CDP_ADDRESS_TLV                 0x0002
 857 #define CDP_PORT_ID_TLV                 0x0003
 858 #define CDP_CAPABILITIES_TLV            0x0004
 859 #define CDP_VERSION_TLV                 0x0005
 860 #define CDP_PLATFORM_TLV                0x0006
 861 #define CDP_NATIVE_VLAN_TLV             0x000a
 862 #define CDP_APPLIANCE_VLAN_TLV          0x000e
 863 #define CDP_TRIGGER_TLV                 0x000f
 864 #define CDP_POWER_CONSUMPTION_TLV       0x0010
 865 #define CDP_SYSNAME_TLV                 0x0014
 866 #define CDP_SYSOBJECT_TLV               0x0015
 867 #define CDP_MANAGEMENT_ADDRESS_TLV      0x0016
 868
 869 #define CDP_TIMEOUT                     250UL   /* one packet every 250ms */
 870
 871 static int CDPSeq;
 872 static int CDPOK;
 873
 874 ushort CDPNativeVLAN;
 875 ushort CDPApplianceVLAN;
 876
 877 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20,
 878                                        0x00 };
 879
 880 static ushort CDP_compute_csum(const uchar *buff, ushort len)
 881 {
 882         ushort csum;
 883         int     odd;
 884         ulong   result = 0;
 885         ushort  leftover;
 886         ushort *p;
 887
 888         if (len > 0) {
 889                 odd = 1 & (ulong)buff;
 890                 if (odd) {
 891                         result = *buff << 8;
 892                         len--;
 893                         buff++;
 894                 }
 895                 while (len > 1) {
 896                         p = (ushort *)buff;
 897                         result += *p++;
 898                         buff = (uchar *)p;
 899                         if (result & 0x80000000)
 900                                 result = (result & 0xFFFF) + (result >> 16);
 901                         len -= 2;
 902                 }
 903                 if (len) {
 904                         leftover = (signed short)(*(const signed char *)buff);
 905                         /* CISCO SUCKS big time! (and blows too):
 906                          * CDP uses the IP checksum algorithm with a twist;
 907                          * for the last byte it *sign* extends and sums.
 908                          */
 909                         result = (result & 0xffff0000) |
 910                                  ((result + leftover) & 0x0000ffff);
 911                 }
 912                 while (result >> 16)
 913                         result = (result & 0xFFFF) + (result >> 16);
 914
 915                 if (odd)
 916                         result = ((result >> 8) & 0xff) |
 917                                  ((result & 0xff) << 8);
 918         }
 919
 920         /* add up 16-bit and 17-bit words for 17+c bits */
 921         result = (result & 0xffff) + (result >> 16);
 922         /* add up 16-bit and 2-bit for 16+c bit */
 923         result = (result & 0xffff) + (result >> 16);
 924         /* add up carry.. */
 925         result = (result & 0xffff) + (result >> 16);
 926
 927         /* negate */
 928         csum = ~(ushort)result;
 929
 930         /* run time endian detection */
 931         if (csum != htons(csum))        /* little endian */
 932                 csum = htons(csum);
 933
 934         return csum;
 935 }
 936
 937 int CDPSendTrigger(void)
 938 {
 939         volatile uchar *pkt;
 940         volatile ushort *s;
 941         volatile ushort *cp;
 942         Ethernet_t *et;
 943         int len;
 944         ushort chksum;
 945 #if     defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID)   || \
 946         defined(CONFIG_CDP_VERSION)   || defined(CONFIG_CDP_PLATFORM)
 947         char buf[32];
 948 #endif
 949
 950         pkt = NetTxPacket;
 951         et = (Ethernet_t *)pkt;
 952
 953         /* NOTE: trigger sent not on any VLAN */
 954
 955         /* form ethernet header */
 956         memcpy(et->et_dest, NetCDPAddr, 6);
 957         memcpy(et->et_src, NetOurEther, 6);
 958
 959         pkt += ETHER_HDR_SIZE;
 960
 961         /* SNAP header */
 962         memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr));
 963         pkt += sizeof(CDP_SNAP_hdr);
 964
 965         /* CDP header */
 966         *pkt++ = 0x02;                          /* CDP version 2 */
 967         *pkt++ = 180;                           /* TTL */
 968         s = (volatile ushort *)pkt;
 969         cp = s;
 970         /* checksum (0 for later calculation) */
 971         *s++ = htons(0);
 972
 973         /* CDP fields */
 974 #ifdef CONFIG_CDP_DEVICE_ID
 975         *s++ = htons(CDP_DEVICE_ID_TLV);
 976         *s++ = htons(CONFIG_CDP_DEVICE_ID);
 977         sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%pm", NetOurEther);
 978         memcpy((uchar *)s, buf, 16);
 979         s += 16 / 2;
 980 #endif
 981
 982 #ifdef CONFIG_CDP_PORT_ID
 983         *s++ = htons(CDP_PORT_ID_TLV);
 984         memset(buf, 0, sizeof(buf));
 985         sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index());
 986         len = strlen(buf);
 987         if (len & 1)    /* make it even */
 988                 len++;
 989         *s++ = htons(len + 4);
 990         memcpy((uchar *)s, buf, len);
 991         s += len / 2;
 992 #endif
 993
 994 #ifdef CONFIG_CDP_CAPABILITIES
 995         *s++ = htons(CDP_CAPABILITIES_TLV);
 996         *s++ = htons(8);
 997         *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES);
 998         s += 2;
 999 #endif
1000
1001 #ifdef CONFIG_CDP_VERSION
1002         *s++ = htons(CDP_VERSION_TLV);
1003         memset(buf, 0, sizeof(buf));
1004         strcpy(buf, CONFIG_CDP_VERSION);
1005         len = strlen(buf);
1006         if (len & 1)    /* make it even */
1007                 len++;
1008         *s++ = htons(len + 4);
1009         memcpy((uchar *)s, buf, len);
1010         s += len / 2;
1011 #endif
1012
1013 #ifdef CONFIG_CDP_PLATFORM
1014         *s++ = htons(CDP_PLATFORM_TLV);
1015         memset(buf, 0, sizeof(buf));
1016         strcpy(buf, CONFIG_CDP_PLATFORM);
1017         len = strlen(buf);
1018         if (len & 1)    /* make it even */
1019                 len++;
1020         *s++ = htons(len + 4);
1021         memcpy((uchar *)s, buf, len);
1022         s += len / 2;
1023 #endif
1024
1025 #ifdef CONFIG_CDP_TRIGGER
1026         *s++ = htons(CDP_TRIGGER_TLV);
1027         *s++ = htons(8);
1028         *(ulong *)s = htonl(CONFIG_CDP_TRIGGER);
1029         s += 2;
1030 #endif
1031
1032 #ifdef CONFIG_CDP_POWER_CONSUMPTION
1033         *s++ = htons(CDP_POWER_CONSUMPTION_TLV);
1034         *s++ = htons(6);
1035         *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION);
1036 #endif
1037
1038         /* length of ethernet packet */
1039         len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE);
1040         et->et_protlen = htons(len);
1041
1042         len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr);
1043         chksum = CDP_compute_csum((uchar *)NetTxPacket + len,
1044                                   (uchar *)s - (NetTxPacket + len));
1045         if (chksum == 0)
1046                 chksum = 0xFFFF;
1047         *cp = htons(chksum);
1048
1049         (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket);
1050         return 0;
1051 }
1052
1053 static void
1054 CDPTimeout(void)
1055 {
1056         CDPSeq++;
1057
1058         if (CDPSeq < 3) {
1059                 NetSetTimeout(CDP_TIMEOUT, CDPTimeout);
1060                 CDPSendTrigger();
1061                 return;
1062         }
1063
1064         /* if not OK try again */
1065         if (!CDPOK)
1066                 NetStartAgain();
1067         else
1068                 NetState = NETLOOP_SUCCESS;
1069 }
1070
1071 static void
1072 CDPDummyHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
1073                 unsigned len)
1074 {
1075         /* nothing */
1076 }
1077
1078 static void
1079 CDPHandler(const uchar *pkt, unsigned len)
1080 {
1081         const uchar *t;
1082         const ushort *ss;
1083         ushort type, tlen;
1084         ushort vlan, nvlan;
1085
1086         /* minimum size? */
1087         if (len < sizeof(CDP_SNAP_hdr) + 4)
1088                 goto pkt_short;
1089
1090         /* check for valid CDP SNAP header */
1091         if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0)
1092                 return;
1093
1094         pkt += sizeof(CDP_SNAP_hdr);
1095         len -= sizeof(CDP_SNAP_hdr);
1096
1097         /* Version of CDP protocol must be >= 2 and TTL != 0 */
1098         if (pkt[0] < 0x02 || pkt[1] == 0)
1099                 return;
1100
1101         /*
1102          * if version is greater than 0x02 maybe we'll have a problem;
1103          * output a warning
1104          */
1105         if (pkt[0] != 0x02)
1106                 printf("** WARNING: CDP packet received with a protocol version %d > 2\n",
1107                                 pkt[0] & 0xff);
1108
1109         if (CDP_compute_csum(pkt, len) != 0)
1110                 return;
1111
1112         pkt += 4;
1113         len -= 4;
1114
1115         vlan = htons(-1);
1116         nvlan = htons(-1);
1117         while (len > 0) {
1118                 if (len < 4)
1119                         goto pkt_short;
1120
1121                 ss = (const ushort *)pkt;
1122                 type = ntohs(ss[0]);
1123                 tlen = ntohs(ss[1]);
1124                 if (tlen > len)
1125                         goto pkt_short;
1126
1127                 pkt += tlen;
1128                 len -= tlen;
1129
1130                 ss += 2;        /* point ss to the data of the TLV */
1131                 tlen -= 4;
1132
1133                 switch (type) {
1134                 case CDP_DEVICE_ID_TLV:
1135                         break;
1136                 case CDP_ADDRESS_TLV:
1137                         break;
1138                 case CDP_PORT_ID_TLV:
1139                         break;
1140                 case CDP_CAPABILITIES_TLV:
1141                         break;
1142                 case CDP_VERSION_TLV:
1143                         break;
1144                 case CDP_PLATFORM_TLV:
1145                         break;
1146                 case CDP_NATIVE_VLAN_TLV:
1147                         nvlan = *ss;
1148                         break;
1149                 case CDP_APPLIANCE_VLAN_TLV:
1150                         t = (const uchar *)ss;
1151                         while (tlen > 0) {
1152                                 if (tlen < 3)
1153                                         goto pkt_short;
1154
1155                                 ss = (const ushort *)(t + 1);
1156
1157 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE
1158                                 if (t[0] == CONFIG_CDP_APPLIANCE_VLAN_TYPE)
1159                                         vlan = *ss;
1160 #else
1161                                 /* XXX will this work; dunno */
1162                                 vlan = ntohs(*ss);
1163 #endif
1164                                 t += 3; tlen -= 3;
1165                         }
1166                         break;
1167                 case CDP_TRIGGER_TLV:
1168                         break;
1169                 case CDP_POWER_CONSUMPTION_TLV:
1170                         break;
1171                 case CDP_SYSNAME_TLV:
1172                         break;
1173                 case CDP_SYSOBJECT_TLV:
1174                         break;
1175                 case CDP_MANAGEMENT_ADDRESS_TLV:
1176                         break;
1177                 }
1178         }
1179
1180         CDPApplianceVLAN = vlan;
1181         CDPNativeVLAN = nvlan;
1182
1183         CDPOK = 1;
1184         return;
1185
1186  pkt_short:
1187         printf("** CDP packet is too short\n");
1188         return;
1189 }
1190
1191 static void CDPStart(void)
1192 {
1193         printf("Using %s device\n", eth_get_name());
1194         CDPSeq = 0;
1195         CDPOK = 0;
1196
1197         CDPNativeVLAN = htons(-1);
1198         CDPApplianceVLAN = htons(-1);
1199
1200         NetSetTimeout(CDP_TIMEOUT, CDPTimeout);
1201         NetSetHandler(CDPDummyHandler);
1202
1203         CDPSendTrigger();
1204 }
1205 #endif
1206
1207 #ifdef CONFIG_IP_DEFRAG
1208 /*
1209  * This function collects fragments in a single packet, according
1210  * to the algorithm in RFC815. It returns NULL or the pointer to
1211  * a complete packet, in static storage
1212  */
1213 #ifndef CONFIG_NET_MAXDEFRAG
1214 #define CONFIG_NET_MAXDEFRAG 16384
1215 #endif
1216 /*
1217  * MAXDEFRAG, above, is chosen in the config file and  is real data
1218  * so we need to add the NFS overhead, which is more than TFTP.
1219  * To use sizeof in the internal unnamed structures, we need a real
1220  * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately).
1221  * The compiler doesn't complain nor allocates the actual structure
1222  */
1223 static struct rpc_t rpc_specimen;
1224 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply))
1225
1226 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE_NO_UDP)
1227
1228 /*
1229  * this is the packet being assembled, either data or frag control.
1230  * Fragments go by 8 bytes, so this union must be 8 bytes long
1231  */
1232 struct hole {
1233         /* first_byte is address of this structure */
1234         u16 last_byte;  /* last byte in this hole + 1 (begin of next hole) */
1235         u16 next_hole;  /* index of next (in 8-b blocks), 0 == none */
1236         u16 prev_hole;  /* index of prev, 0 == none */
1237         u16 unused;
1238 };
1239
1240 static IP_t *__NetDefragment(IP_t *ip, int *lenp)
1241 {
1242         static uchar pkt_buff[IP_PKTSIZE] __attribute__((aligned(PKTALIGN)));
1243         static u16 first_hole, total_len;
1244         struct hole *payload, *thisfrag, *h, *newh;
1245         IP_t *localip = (IP_t *)pkt_buff;
1246         uchar *indata = (uchar *)ip;
1247         int offset8, start, len, done = 0;
1248         u16 ip_off = ntohs(ip->ip_off);
1249
1250         /* payload starts after IP header, this fragment is in there */
1251         payload = (struct hole *)(pkt_buff + IP_HDR_SIZE_NO_UDP);
1252         offset8 =  (ip_off & IP_OFFS);
1253         thisfrag = payload + offset8;
1254         start = offset8 * 8;
1255         len = ntohs(ip->ip_len) - IP_HDR_SIZE_NO_UDP;
1256
1257         if (start + len > IP_MAXUDP) /* fragment extends too far */
1258                 return NULL;
1259
1260         if (!total_len || localip->ip_id != ip->ip_id) {
1261                 /* new (or different) packet, reset structs */
1262                 total_len = 0xffff;
1263                 payload[0].last_byte = ~0;
1264                 payload[0].next_hole = 0;
1265                 payload[0].prev_hole = 0;
1266                 first_hole = 0;
1267                 /* any IP header will work, copy the first we received */
1268                 memcpy(localip, ip, IP_HDR_SIZE_NO_UDP);
1269         }
1270
1271         /*
1272          * What follows is the reassembly algorithm. We use the payload
1273          * array as a linked list of hole descriptors, as each hole starts
1274          * at a multiple of 8 bytes. However, last byte can be whatever value,
1275          * so it is represented as byte count, not as 8-byte blocks.
1276          */
1277
1278         h = payload + first_hole;
1279         while (h->last_byte < start) {
1280                 if (!h->next_hole) {
1281                         /* no hole that far away */
1282                         return NULL;
1283                 }
1284                 h = payload + h->next_hole;
1285         }
1286
1287         /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
1288         if (offset8 + ((len + 7) / 8) <= h - payload) {
1289                 /* no overlap with holes (dup fragment?) */
1290                 return NULL;
1291         }
1292
1293         if (!(ip_off & IP_FLAGS_MFRAG)) {
1294                 /* no more fragmentss: truncate this (last) hole */
1295                 total_len = start + len;
1296                 h->last_byte = start + len;
1297         }
1298
1299         /*
1300          * There is some overlap: fix the hole list. This code doesn't
1301          * deal with a fragment that overlaps with two different holes
1302          * (thus being a superset of a previously-received fragment).
1303          */
1304
1305         if ((h >= thisfrag) && (h->last_byte <= start + len)) {
1306                 /* complete overlap with hole: remove hole */
1307                 if (!h->prev_hole && !h->next_hole) {
1308                         /* last remaining hole */
1309                         done = 1;
1310                 } else if (!h->prev_hole) {
1311                         /* first hole */
1312                         first_hole = h->next_hole;
1313                         payload[h->next_hole].prev_hole = 0;
1314                 } else if (!h->next_hole) {
1315                         /* last hole */
1316                         payload[h->prev_hole].next_hole = 0;
1317                 } else {
1318                         /* in the middle of the list */
1319                         payload[h->next_hole].prev_hole = h->prev_hole;
1320                         payload[h->prev_hole].next_hole = h->next_hole;
1321                 }
1322
1323         } else if (h->last_byte <= start + len) {
1324                 /* overlaps with final part of the hole: shorten this hole */
1325                 h->last_byte = start;
1326
1327         } else if (h >= thisfrag) {
1328                 /* overlaps with initial part of the hole: move this hole */
1329                 newh = thisfrag + (len / 8);
1330                 *newh = *h;
1331                 h = newh;
1332                 if (h->next_hole)
1333                         payload[h->next_hole].prev_hole = (h - payload);
1334                 if (h->prev_hole)
1335                         payload[h->prev_hole].next_hole = (h - payload);
1336                 else
1337                         first_hole = (h - payload);
1338
1339         } else {
1340                 /* fragment sits in the middle: split the hole */
1341                 newh = thisfrag + (len / 8);
1342                 *newh = *h;
1343                 h->last_byte = start;
1344                 h->next_hole = (newh - payload);
1345                 newh->prev_hole = (h - payload);
1346                 if (newh->next_hole)
1347                         payload[newh->next_hole].prev_hole = (newh - payload);
1348         }
1349
1350         /* finally copy this fragment and possibly return whole packet */
1351         memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE_NO_UDP, len);
1352         if (!done)
1353                 return NULL;
1354
1355         localip->ip_len = htons(total_len);
1356         *lenp = total_len + IP_HDR_SIZE_NO_UDP;
1357         return localip;
1358 }
1359
1360 static inline IP_t *NetDefragment(IP_t *ip, int *lenp)
1361 {
1362         u16 ip_off = ntohs(ip->ip_off);
1363         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1364                 return ip; /* not a fragment */
1365         return __NetDefragment(ip, lenp);
1366 }
1367
1368 #else /* !CONFIG_IP_DEFRAG */
1369
1370 static inline IP_t *NetDefragment(IP_t *ip, int *lenp)
1371 {
1372         u16 ip_off = ntohs(ip->ip_off);
1373         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1374                 return ip; /* not a fragment */
1375         return NULL;
1376 }
1377 #endif
1378
1379 /**
1380  * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
1381  * drop others.
1382  *
1383  * @parma ip    IP packet containing the ICMP
1384  */
1385 static void receive_icmp(IP_t *ip, int len, IPaddr_t src_ip, Ethernet_t *et)
1386 {
1387         ICMP_t *icmph = (ICMP_t *)&ip->udp_src;
1388
1389         switch (icmph->type) {
1390         case ICMP_REDIRECT:
1391                 if (icmph->code != ICMP_REDIR_HOST)
1392                         return;
1393                 printf(" ICMP Host Redirect to %pI4 ",
1394                         &icmph->un.gateway);
1395                 break;
1396 #if defined(CONFIG_CMD_PING)
1397         case ICMP_ECHO_REPLY:
1398                 /*
1399                         * IP header OK.  Pass the packet to the
1400                         * current handler.
1401                         */
1402                 /*
1403                  * XXX point to ip packet - should this use
1404                  * packet_icmp_handler?
1405                  */
1406                 (*packetHandler)((uchar *)ip, 0, src_ip, 0, 0);
1407                 break;
1408         case ICMP_ECHO_REQUEST:
1409                 debug("Got ICMP ECHO REQUEST, return %d bytes\n",
1410                         ETHER_HDR_SIZE + len);
1411
1412                 memcpy(&et->et_dest[0], &et->et_src[0], 6);
1413                 memcpy(&et->et_src[0], NetOurEther, 6);
1414
1415                 ip->ip_sum = 0;
1416                 ip->ip_off = 0;
1417                 NetCopyIP((void *)&ip->ip_dst, &ip->ip_src);
1418                 NetCopyIP((void *)&ip->ip_src, &NetOurIP);
1419                 ip->ip_sum = ~NetCksum((uchar *)ip,
1420                                         IP_HDR_SIZE_NO_UDP >> 1);
1421
1422                 icmph->type = ICMP_ECHO_REPLY;
1423                 icmph->checksum = 0;
1424                 icmph->checksum = ~NetCksum((uchar *)icmph,
1425                         (len - IP_HDR_SIZE_NO_UDP) >> 1);
1426                 (void) eth_send((uchar *)et,
1427                                 ETHER_HDR_SIZE + len);
1428                 break;
1429 #endif
1430         default:
1431 #ifdef CONFIG_CMD_TFTPPUT
1432                 if (packet_icmp_handler)
1433                         packet_icmp_handler(icmph->type, icmph->code,
1434                                 ntohs(ip->udp_dst), src_ip, ntohs(ip->udp_src),
1435                                 icmph->un.data, ntohs(ip->udp_len));
1436 #endif
1437                 break;
1438         }
1439 }
1440
1441 void
1442 NetReceive(volatile uchar *inpkt, int len)
1443 {
1444         Ethernet_t *et;
1445         IP_t    *ip;
1446         ARP_t   *arp;
1447         IPaddr_t tmp;
1448         IPaddr_t src_ip;
1449         int     x;
1450         uchar *pkt;
1451 #if defined(CONFIG_CMD_CDP)
1452         int iscdp;
1453 #endif
1454         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1455
1456         debug("packet received\n");
1457
1458         NetRxPacket = inpkt;
1459         NetRxPacketLen = len;
1460         et = (Ethernet_t *)inpkt;
1461
1462         /* too small packet? */
1463         if (len < ETHER_HDR_SIZE)
1464                 return;
1465
1466 #ifdef CONFIG_API
1467         if (push_packet) {
1468                 (*push_packet)(inpkt, len);
1469                 return;
1470         }
1471 #endif
1472
1473 #if defined(CONFIG_CMD_CDP)
1474         /* keep track if packet is CDP */
1475         iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0;
1476 #endif
1477
1478         myvlanid = ntohs(NetOurVLAN);
1479         if (myvlanid == (ushort)-1)
1480                 myvlanid = VLAN_NONE;
1481         mynvlanid = ntohs(NetOurNativeVLAN);
1482         if (mynvlanid == (ushort)-1)
1483                 mynvlanid = VLAN_NONE;
1484
1485         x = ntohs(et->et_protlen);
1486
1487         debug("packet received\n");
1488
1489         if (x < 1514) {
1490                 /*
1491                  *      Got a 802 packet.  Check the other protocol field.
1492                  */
1493                 x = ntohs(et->et_prot);
1494
1495                 ip = (IP_t *)(inpkt + E802_HDR_SIZE);
1496                 len -= E802_HDR_SIZE;
1497
1498         } else if (x != PROT_VLAN) {    /* normal packet */
1499                 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE);
1500                 len -= ETHER_HDR_SIZE;
1501
1502         } else {                        /* VLAN packet */
1503                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et;
1504
1505                 debug("VLAN packet received\n");
1506
1507                 /* too small packet? */
1508                 if (len < VLAN_ETHER_HDR_SIZE)
1509                         return;
1510
1511                 /* if no VLAN active */
1512                 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
1513 #if defined(CONFIG_CMD_CDP)
1514                                 && iscdp == 0
1515 #endif
1516                                 )
1517                         return;
1518
1519                 cti = ntohs(vet->vet_tag);
1520                 vlanid = cti & VLAN_IDMASK;
1521                 x = ntohs(vet->vet_type);
1522
1523                 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE);
1524                 len -= VLAN_ETHER_HDR_SIZE;
1525         }
1526
1527         debug("Receive from protocol 0x%x\n", x);
1528
1529 #if defined(CONFIG_CMD_CDP)
1530         if (iscdp) {
1531                 CDPHandler((uchar *)ip, len);
1532                 return;
1533         }
1534 #endif
1535
1536         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1537                 if (vlanid == VLAN_NONE)
1538                         vlanid = (mynvlanid & VLAN_IDMASK);
1539                 /* not matched? */
1540                 if (vlanid != (myvlanid & VLAN_IDMASK))
1541                         return;
1542         }
1543
1544         switch (x) {
1545
1546         case PROT_ARP:
1547                 /*
1548                  * We have to deal with two types of ARP packets:
1549                  * - REQUEST packets will be answered by sending  our
1550                  *   IP address - if we know it.
1551                  * - REPLY packates are expected only after we asked
1552                  *   for the TFTP server's or the gateway's ethernet
1553                  *   address; so if we receive such a packet, we set
1554                  *   the server ethernet address
1555                  */
1556                 debug("Got ARP\n");
1557
1558                 arp = (ARP_t *)ip;
1559                 if (len < ARP_HDR_SIZE) {
1560                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1561                         return;
1562                 }
1563                 if (ntohs(arp->ar_hrd) != ARP_ETHER)
1564                         return;
1565                 if (ntohs(arp->ar_pro) != PROT_IP)
1566                         return;
1567                 if (arp->ar_hln != 6)
1568                         return;
1569                 if (arp->ar_pln != 4)
1570                         return;
1571
1572                 if (NetOurIP == 0)
1573                         return;
1574
1575                 if (NetReadIP(&arp->ar_data[16]) != NetOurIP)
1576                         return;
1577
1578                 switch (ntohs(arp->ar_op)) {
1579                 case ARPOP_REQUEST:
1580                         /* reply with our IP address */
1581                         debug("Got ARP REQUEST, return our IP\n");
1582                         pkt = (uchar *)et;
1583                         pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
1584                         arp->ar_op = htons(ARPOP_REPLY);
1585                         memcpy(&arp->ar_data[10], &arp->ar_data[0], 6);
1586                         NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
1587                         memcpy(&arp->ar_data[0], NetOurEther, 6);
1588                         NetCopyIP(&arp->ar_data[6], &NetOurIP);
1589                         (void) eth_send((uchar *)et,
1590                                         (pkt - (uchar *)et) + ARP_HDR_SIZE);
1591                         return;
1592
1593                 case ARPOP_REPLY:               /* arp reply */
1594                         /* are we waiting for a reply */
1595                         if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
1596                                 break;
1597
1598 #ifdef CONFIG_KEEP_SERVERADDR
1599                         if (NetServerIP == NetArpWaitPacketIP) {
1600                                 char buf[20];
1601                                 sprintf(buf, "%pM", arp->ar_data);
1602                                 setenv("serveraddr", buf);
1603                         }
1604 #endif
1605
1606                         debug("Got ARP REPLY, set server/gtwy eth addr (%pM)\n",
1607                                 arp->ar_data);
1608
1609                         tmp = NetReadIP(&arp->ar_data[6]);
1610
1611                         /* matched waiting packet's address */
1612                         if (tmp == NetArpWaitReplyIP) {
1613                                 debug("Got it\n");
1614                                 /* save address for later use */
1615                                 memcpy(NetArpWaitPacketMAC,
1616                                        &arp->ar_data[0], 6);
1617
1618 #ifdef CONFIG_NETCONSOLE
1619                                 (*packetHandler)(0, 0, 0, 0, 0);
1620 #endif
1621                                 /* modify header, and transmit it */
1622                                 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6);
1623                                 (void) eth_send(NetArpWaitTxPacket,
1624                                                 NetArpWaitTxPacketSize);
1625
1626                                 /* no arp request pending now */
1627                                 NetArpWaitPacketIP = 0;
1628                                 NetArpWaitTxPacketSize = 0;
1629                                 NetArpWaitPacketMAC = NULL;
1630
1631                         }
1632                         return;
1633                 default:
1634                         debug("Unexpected ARP opcode 0x%x\n",
1635                               ntohs(arp->ar_op));
1636                         return;
1637                 }
1638                 break;
1639
1640 #ifdef CONFIG_CMD_RARP
1641         case PROT_RARP:
1642                 debug("Got RARP\n");
1643                 arp = (ARP_t *)ip;
1644                 if (len < ARP_HDR_SIZE) {
1645                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1646                         return;
1647                 }
1648
1649                 if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
1650                         (ntohs(arp->ar_hrd) != ARP_ETHER)   ||
1651                         (ntohs(arp->ar_pro) != PROT_IP)     ||
1652                         (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
1653
1654                         puts("invalid RARP header\n");
1655                 } else {
1656                         NetCopyIP(&NetOurIP, &arp->ar_data[16]);
1657                         if (NetServerIP == 0)
1658                                 NetCopyIP(&NetServerIP, &arp->ar_data[6]);
1659                         memcpy(NetServerEther, &arp->ar_data[0], 6);
1660
1661                         (*packetHandler)(0, 0, 0, 0, 0);
1662                 }
1663                 break;
1664 #endif
1665         case PROT_IP:
1666                 debug("Got IP\n");
1667                 /* Before we start poking the header, make sure it is there */
1668                 if (len < IP_HDR_SIZE) {
1669                         debug("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE);
1670                         return;
1671                 }
1672                 /* Check the packet length */
1673                 if (len < ntohs(ip->ip_len)) {
1674                         printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
1675                         return;
1676                 }
1677                 len = ntohs(ip->ip_len);
1678                 debug("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
1679
1680                 /* Can't deal with anything except IPv4 */
1681                 if ((ip->ip_hl_v & 0xf0) != 0x40)
1682                         return;
1683                 /* Can't deal with IP options (headers != 20 bytes) */
1684                 if ((ip->ip_hl_v & 0x0f) > 0x05)
1685                         return;
1686                 /* Check the Checksum of the header */
1687                 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
1688                         puts("checksum bad\n");
1689                         return;
1690                 }
1691                 /* If it is not for us, ignore it */
1692                 tmp = NetReadIP(&ip->ip_dst);
1693                 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
1694 #ifdef CONFIG_MCAST_TFTP
1695                         if (Mcast_addr != tmp)
1696 #endif
1697                                 return;
1698                 }
1699                 /* Read source IP address for later use */
1700                 src_ip = NetReadIP(&ip->ip_src);
1701                 /*
1702                  * The function returns the unchanged packet if it's not
1703                  * a fragment, and either the complete packet or NULL if
1704                  * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1705                  */
1706                 ip = NetDefragment(ip, &len);
1707                 if (!ip)
1708                         return;
1709                 /*
1710                  * watch for ICMP host redirects
1711                  *
1712                  * There is no real handler code (yet). We just watch
1713                  * for ICMP host redirect messages. In case anybody
1714                  * sees these messages: please contact me
1715                  * (wd@denx.de), or - even better - send me the
1716                  * necessary fixes :-)
1717                  *
1718                  * Note: in all cases where I have seen this so far
1719                  * it was a problem with the router configuration,
1720                  * for instance when a router was configured in the
1721                  * BOOTP reply, but the TFTP server was on the same
1722                  * subnet. So this is probably a warning that your
1723                  * configuration might be wrong. But I'm not really
1724                  * sure if there aren't any other situations.
1725                  *
1726                  * Simon Glass <sjg@chromium.org>: We get an ICMP when
1727                  * we send a tftp packet to a dead connection, or when
1728                  * there is no server at the other end.
1729                  */
1730                 if (ip->ip_p == IPPROTO_ICMP) {
1731                         receive_icmp(ip, len, src_ip, et);
1732                         return;
1733                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1734                         return;
1735                 }
1736
1737 #ifdef CONFIG_UDP_CHECKSUM
1738                 if (ip->udp_xsum != 0) {
1739                         ulong   xsum;
1740                         ushort *sumptr;
1741                         ushort  sumlen;
1742
1743                         xsum  = ip->ip_p;
1744                         xsum += (ntohs(ip->udp_len));
1745                         xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
1746                         xsum += (ntohl(ip->ip_src) >>  0) & 0x0000ffff;
1747                         xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
1748                         xsum += (ntohl(ip->ip_dst) >>  0) & 0x0000ffff;
1749
1750                         sumlen = ntohs(ip->udp_len);
1751                         sumptr = (ushort *) &(ip->udp_src);
1752
1753                         while (sumlen > 1) {
1754                                 ushort sumdata;
1755
1756                                 sumdata = *sumptr++;
1757                                 xsum += ntohs(sumdata);
1758                                 sumlen -= 2;
1759                         }
1760                         if (sumlen > 0) {
1761                                 ushort sumdata;
1762
1763                                 sumdata = *(unsigned char *) sumptr;
1764                                 sumdata = (sumdata << 8) & 0xff00;
1765                                 xsum += sumdata;
1766                         }
1767                         while ((xsum >> 16) != 0) {
1768                                 xsum = (xsum & 0x0000ffff) +
1769                                        ((xsum >> 16) & 0x0000ffff);
1770                         }
1771                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1772                                 printf(" UDP wrong checksum %08lx %08x\n",
1773                                         xsum, ntohs(ip->udp_xsum));
1774                                 return;
1775                         }
1776                 }
1777 #endif
1778
1779
1780 #ifdef CONFIG_NETCONSOLE
1781                 nc_input_packet((uchar *)ip + IP_HDR_SIZE,
1782                                                 ntohs(ip->udp_dst),
1783                                                 ntohs(ip->udp_src),
1784                                                 ntohs(ip->udp_len) - 8);
1785 #endif
1786                 /*
1787                  *      IP header OK.  Pass the packet to the current handler.
1788                  */
1789                 (*packetHandler)((uchar *)ip + IP_HDR_SIZE,
1790                                                 ntohs(ip->udp_dst),
1791                                                 src_ip,
1792                                                 ntohs(ip->udp_src),
1793                                                 ntohs(ip->udp_len) - 8);
1794                 break;
1795         }
1796 }
1797
1798
1799 /**********************************************************************/
1800
1801 static int net_check_prereq(enum proto_t protocol)
1802 {
1803         switch (protocol) {
1804                 /* Fall through */
1805 #if defined(CONFIG_CMD_PING)
1806         case PING:
1807                 if (NetPingIP == 0) {
1808                         puts("*** ERROR: ping address not given\n");
1809                         return 1;
1810                 }
1811                 goto common;
1812 #endif
1813 #if defined(CONFIG_CMD_SNTP)
1814         case SNTP:
1815                 if (NetNtpServerIP == 0) {
1816                         puts("*** ERROR: NTP server address not given\n");
1817                         return 1;
1818                 }
1819                 goto common;
1820 #endif
1821 #if defined(CONFIG_CMD_DNS)
1822         case DNS:
1823                 if (NetOurDNSIP == 0) {
1824                         puts("*** ERROR: DNS server address not given\n");
1825                         return 1;
1826                 }
1827                 goto common;
1828 #endif
1829 #if defined(CONFIG_CMD_NFS)
1830         case NFS:
1831 #endif
1832         case TFTPGET:
1833         case TFTPPUT:
1834                 if (NetServerIP == 0) {
1835                         puts("*** ERROR: `serverip' not set\n");
1836                         return 1;
1837                 }
1838 #if     defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
1839         defined(CONFIG_CMD_DNS)
1840 common:
1841 #endif
1842                 /* Fall through */
1843
1844         case NETCONS:
1845         case TFTPSRV:
1846                 if (NetOurIP == 0) {
1847                         puts("*** ERROR: `ipaddr' not set\n");
1848                         return 1;
1849                 }
1850                 /* Fall through */
1851
1852 #ifdef CONFIG_CMD_RARP
1853         case RARP:
1854 #endif
1855         case BOOTP:
1856         case CDP:
1857         case DHCP:
1858                 if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
1859                         extern int eth_get_dev_index(void);
1860                         int num = eth_get_dev_index();
1861
1862                         switch (num) {
1863                         case -1:
1864                                 puts("*** ERROR: No ethernet found.\n");
1865                                 return 1;
1866                         case 0:
1867                                 puts("*** ERROR: `ethaddr' not set\n");
1868                                 break;
1869                         default:
1870                                 printf("*** ERROR: `eth%daddr' not set\n",
1871                                         num);
1872                                 break;
1873                         }
1874
1875                         NetStartAgain();
1876                         return 2;
1877                 }
1878                 /* Fall through */
1879         default:
1880                 return 0;
1881         }
1882         return 0;               /* OK */
1883 }
1884 /**********************************************************************/
1885
1886 int
1887 NetCksumOk(uchar *ptr, int len)
1888 {
1889         return !((NetCksum(ptr, len) + 1) & 0xfffe);
1890 }
1891
1892
1893 unsigned
1894 NetCksum(uchar *ptr, int len)
1895 {
1896         ulong   xsum;
1897         ushort *p = (ushort *)ptr;
1898
1899         xsum = 0;
1900         while (len-- > 0)
1901                 xsum += *p++;
1902         xsum = (xsum & 0xffff) + (xsum >> 16);
1903         xsum = (xsum & 0xffff) + (xsum >> 16);
1904         return xsum & 0xffff;
1905 }
1906
1907 int
1908 NetEthHdrSize(void)
1909 {
1910         ushort myvlanid;
1911
1912         myvlanid = ntohs(NetOurVLAN);
1913         if (myvlanid == (ushort)-1)
1914                 myvlanid = VLAN_NONE;
1915
1916         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1917                 VLAN_ETHER_HDR_SIZE;
1918 }
1919
1920 int
1921 NetSetEther(volatile uchar *xet, uchar * addr, uint prot)
1922 {
1923         Ethernet_t *et = (Ethernet_t *)xet;
1924         ushort myvlanid;
1925
1926         myvlanid = ntohs(NetOurVLAN);
1927         if (myvlanid == (ushort)-1)
1928                 myvlanid = VLAN_NONE;
1929
1930         memcpy(et->et_dest, addr, 6);
1931         memcpy(et->et_src, NetOurEther, 6);
1932         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1933                 et->et_protlen = htons(prot);
1934                 return ETHER_HDR_SIZE;
1935         } else {
1936                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet;
1937
1938                 vet->vet_vlan_type = htons(PROT_VLAN);
1939                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1940                 vet->vet_type = htons(prot);
1941                 return VLAN_ETHER_HDR_SIZE;
1942         }
1943 }
1944
1945 void
1946 NetSetIP(volatile uchar *xip, IPaddr_t dest, int dport, int sport, int len)
1947 {
1948         IP_t *ip = (IP_t *)xip;
1949
1950         /*
1951          *      If the data is an odd number of bytes, zero the
1952          *      byte after the last byte so that the checksum
1953          *      will work.
1954          */
1955         if (len & 1)
1956                 xip[IP_HDR_SIZE + len] = 0;
1957
1958         /*
1959          *      Construct an IP and UDP header.
1960          *      (need to set no fragment bit - XXX)
1961          */
1962         /* IP_HDR_SIZE / 4 (not including UDP) */
1963         ip->ip_hl_v  = 0x45;
1964         ip->ip_tos   = 0;
1965         ip->ip_len   = htons(IP_HDR_SIZE + len);
1966         ip->ip_id    = htons(NetIPID++);
1967         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1968         ip->ip_ttl   = 255;
1969         ip->ip_p     = 17;              /* UDP */
1970         ip->ip_sum   = 0;
1971         /* already in network byte order */
1972         NetCopyIP((void *)&ip->ip_src, &NetOurIP);
1973         /* - "" - */
1974         NetCopyIP((void *)&ip->ip_dst, &dest);
1975         ip->udp_src  = htons(sport);
1976         ip->udp_dst  = htons(dport);
1977         ip->udp_len  = htons(8 + len);
1978         ip->udp_xsum = 0;
1979         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
1980 }
1981
1982 void copy_filename(char *dst, const char *src, int size)
1983 {
1984         if (*src && (*src == '"')) {
1985                 ++src;
1986                 --size;
1987         }
1988
1989         while ((--size > 0) && *src && (*src != '"'))
1990                 *dst++ = *src++;
1991         *dst = '\0';
1992 }
1993
1994 #if     defined(CONFIG_CMD_NFS)         || \
1995         defined(CONFIG_CMD_SNTP)        || \
1996         defined(CONFIG_CMD_DNS)
1997 /*
1998  * make port a little random (1024-17407)
1999  * This keeps the math somewhat trivial to compute, and seems to work with
2000  * all supported protocols/clients/servers
2001  */
2002 unsigned int random_port(void)
2003 {
2004         return 1024 + (get_timer(0) % 0x4000);
2005 }
2006 #endif
2007
2008 void ip_to_string(IPaddr_t x, char *s)
2009 {
2010         x = ntohl(x);
2011         sprintf(s, "%d.%d.%d.%d",
2012                 (int) ((x >> 24) & 0xff),
2013                 (int) ((x >> 16) & 0xff),
2014                 (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
2015         );
2016 }
2017
2018 void VLAN_to_string(ushort x, char *s)
2019 {
2020         x = ntohs(x);
2021
2022         if (x == (ushort)-1)
2023                 x = VLAN_NONE;
2024
2025         if (x == VLAN_NONE)
2026                 strcpy(s, "none");
2027         else
2028                 sprintf(s, "%d", x & VLAN_IDMASK);
2029 }
2030
2031 ushort string_to_VLAN(const char *s)
2032 {
2033         ushort id;
2034
2035         if (s == NULL)
2036                 return htons(VLAN_NONE);
2037
2038         if (*s < '0' || *s > '9')
2039                 id = VLAN_NONE;
2040         else
2041                 id = (ushort)simple_strtoul(s, NULL, 10);
2042
2043         return htons(id);
2044 }
2045
2046 ushort getenv_VLAN(char *var)
2047 {
2048         return string_to_VLAN(getenv(var));
2049 }