git.sur5r.net Git - u-boot/blob - 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 # define ARP_TIMEOUT            5000UL  /* Milliseconds before trying ARP again */
 105 #else
 106 # define ARP_TIMEOUT            CONFIG_ARP_TIMEOUT
 107 #endif
 108
 109
 110 #ifndef CONFIG_NET_RETRY_COUNT
 111 # define ARP_TIMEOUT_COUNT      5       /* # of timeouts before giving up  */
 112 #else
 113 # define ARP_TIMEOUT_COUNT      CONFIG_NET_RETRY_COUNT
 114 #endif
 115
 116 /** BOOTP EXTENTIONS **/
 117
 118 IPaddr_t        NetOurSubnetMask=0;             /* Our subnet mask (0=unknown)  */
 119 IPaddr_t        NetOurGatewayIP=0;              /* Our gateways IP address      */
 120 IPaddr_t        NetOurDNSIP=0;                  /* Our DNS IP address           */
 121 #if defined(CONFIG_BOOTP_DNS2)
 122 IPaddr_t        NetOurDNS2IP=0;                 /* Our 2nd DNS IP address       */
 123 #endif
 124 char            NetOurNISDomain[32]={0,};       /* Our NIS domain               */
 125 char            NetOurHostName[32]={0,};        /* Our hostname                 */
 126 char            NetOurRootPath[64]={0,};        /* Our bootpath                 */
 127 ushort          NetBootFileSize=0;              /* Our bootfile size in blocks  */
 128
 129 #ifdef CONFIG_MCAST_TFTP        /* Multicast TFTP */
 130 IPaddr_t Mcast_addr;
 131 #endif
 132
 133 /** END OF BOOTP EXTENTIONS **/
 134
 135 ulong           NetBootFileXferSize;    /* The actual transferred size of the bootfile (in bytes) */
 136 uchar           NetOurEther[6];         /* Our ethernet address                 */
 137 uchar           NetServerEther[6] =     /* Boot server enet address             */
 138                         { 0, 0, 0, 0, 0, 0 };
 139 IPaddr_t        NetOurIP;               /* Our IP addr (0 = unknown)            */
 140 IPaddr_t        NetServerIP;            /* Server IP addr (0 = unknown)         */
 141 volatile uchar *NetRxPacket;            /* Current receive packet               */
 142 int             NetRxPacketLen;         /* Current rx packet length             */
 143 unsigned        NetIPID;                /* IP packet ID                         */
 144 uchar           NetBcastAddr[6] =       /* Ethernet bcast address               */
 145                         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 146 uchar           NetEtherNullAddr[6] =
 147                         { 0, 0, 0, 0, 0, 0 };
 148 #ifdef CONFIG_API
 149 void            (*push_packet)(volatile void *, int len) = 0;
 150 #endif
 151 #if defined(CONFIG_CMD_CDP)
 152 uchar           NetCDPAddr[6] =         /* Ethernet bcast address               */
 153                         { 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc };
 154 #endif
 155 int             NetState;               /* Network loop state                   */
 156 #ifdef CONFIG_NET_MULTI
 157 int             NetRestartWrap = 0;     /* Tried all network devices            */
 158 static int      NetRestarted = 0;       /* Network loop restarted               */
 159 static int      NetDevExists = 0;       /* At least one device configured       */
 160 #endif
 161
 162 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
 163 ushort          NetOurVLAN = 0xFFFF;            /* default is without VLAN      */
 164 ushort          NetOurNativeVLAN = 0xFFFF;      /* ditto                        */
 165
 166 char            BootFile[128];          /* Boot File name                       */
 167
 168 #if defined(CONFIG_CMD_PING)
 169 IPaddr_t        NetPingIP;              /* the ip address to ping               */
 170
 171 static void PingStart(void);
 172 #endif
 173
 174 #if defined(CONFIG_CMD_CDP)
 175 static void CDPStart(void);
 176 #endif
 177
 178 #if defined(CONFIG_CMD_SNTP)
 179 IPaddr_t        NetNtpServerIP;         /* NTP server IP address                */
 180 int             NetTimeOffset=0;        /* offset time from UTC                 */
 181 #endif
 182
 183 #ifdef CONFIG_NETCONSOLE
 184 void NcStart(void);
 185 int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len);
 186 #endif
 187
 188 volatile uchar  PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 189
 190 volatile uchar *NetRxPackets[PKTBUFSRX]; /* Receive packets                     */
 191
 192 static rxhand_f *packetHandler;         /* Current RX packet handler            */
 193 static thand_f *timeHandler;            /* Current timeout handler              */
 194 static ulong    timeStart;              /* Time base value                      */
 195 static ulong    timeDelta;              /* Current timeout value                */
 196 volatile uchar *NetTxPacket = 0;        /* THE transmit packet                  */
 197
 198 static int net_check_prereq (proto_t protocol);
 199
 200 static int NetTryCount;
 201
 202 /**********************************************************************/
 203
 204 IPaddr_t        NetArpWaitPacketIP;
 205 IPaddr_t        NetArpWaitReplyIP;
 206 uchar          *NetArpWaitPacketMAC;    /* MAC address of waiting packet's destination  */
 207 uchar          *NetArpWaitTxPacket;     /* THE transmit packet                  */
 208 int             NetArpWaitTxPacketSize;
 209 uchar           NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
 210 ulong           NetArpWaitTimerStart;
 211 int             NetArpWaitTry;
 212
 213 void ArpRequest (void)
 214 {
 215         int i;
 216         volatile uchar *pkt;
 217         ARP_t *arp;
 218
 219         debug("ARP broadcast %d\n", NetArpWaitTry);
 220
 221         pkt = NetTxPacket;
 222
 223         pkt += NetSetEther (pkt, NetBcastAddr, PROT_ARP);
 224
 225         arp = (ARP_t *) pkt;
 226
 227         arp->ar_hrd = htons (ARP_ETHER);
 228         arp->ar_pro = htons (PROT_IP);
 229         arp->ar_hln = 6;
 230         arp->ar_pln = 4;
 231         arp->ar_op = htons (ARPOP_REQUEST);
 232
 233         memcpy (&arp->ar_data[0], NetOurEther, 6);              /* source ET addr       */
 234         NetWriteIP ((uchar *) & arp->ar_data[6], NetOurIP);     /* source IP addr       */
 235         for (i = 10; i < 16; ++i) {
 236                 arp->ar_data[i] = 0;                            /* dest ET addr = 0     */
 237         }
 238
 239         if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
 240             (NetOurIP & NetOurSubnetMask)) {
 241                 if (NetOurGatewayIP == 0) {
 242                         puts ("## Warning: gatewayip needed but not set\n");
 243                         NetArpWaitReplyIP = NetArpWaitPacketIP;
 244                 } else {
 245                         NetArpWaitReplyIP = NetOurGatewayIP;
 246                 }
 247         } else {
 248                 NetArpWaitReplyIP = NetArpWaitPacketIP;
 249         }
 250
 251         NetWriteIP ((uchar *) & arp->ar_data[16], NetArpWaitReplyIP);
 252         (void) eth_send (NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
 253 }
 254
 255 void ArpTimeoutCheck(void)
 256 {
 257         ulong t;
 258
 259         if (!NetArpWaitPacketIP)
 260                 return;
 261
 262         t = get_timer(0);
 263
 264         /* check for arp timeout */
 265         if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT) {
 266                 NetArpWaitTry++;
 267
 268                 if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
 269                         puts ("\nARP Retry count exceeded; starting again\n");
 270                         NetArpWaitTry = 0;
 271                         NetStartAgain();
 272                 } else {
 273                         NetArpWaitTimerStart = t;
 274                         ArpRequest();
 275                 }
 276         }
 277 }
 278
 279 static void
 280 NetInitLoop(proto_t protocol)
 281 {
 282         static int env_changed_id = 0;
 283         bd_t *bd = gd->bd;
 284         int env_id = get_env_id ();
 285
 286         /* update only when the environment has changed */
 287         if (env_changed_id != env_id) {
 288                 NetCopyIP(&NetOurIP, &bd->bi_ip_addr);
 289                 NetOurGatewayIP = getenv_IPaddr ("gatewayip");
 290                 NetOurSubnetMask= getenv_IPaddr ("netmask");
 291                 NetServerIP = getenv_IPaddr ("serverip");
 292                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 293                 NetOurVLAN = getenv_VLAN("vlan");
 294 #if defined(CONFIG_CMD_DNS)
 295                 NetOurDNSIP = getenv_IPaddr("dnsip");
 296 #endif
 297                 env_changed_id = env_id;
 298         }
 299
 300         return;
 301 }
 302
 303 /**********************************************************************/
 304 /*
 305  *      Main network processing loop.
 306  */
 307
 308 int
 309 NetLoop(proto_t protocol)
 310 {
 311         bd_t *bd = gd->bd;
 312
 313 #ifdef CONFIG_NET_MULTI
 314         NetRestarted = 0;
 315         NetDevExists = 0;
 316 #endif
 317
 318         /* XXX problem with bss workaround */
 319         NetArpWaitPacketMAC = NULL;
 320         NetArpWaitTxPacket = NULL;
 321         NetArpWaitPacketIP = 0;
 322         NetArpWaitReplyIP = 0;
 323         NetArpWaitTxPacket = NULL;
 324         NetTxPacket = NULL;
 325         NetTryCount = 1;
 326
 327         if (!NetTxPacket) {
 328                 int     i;
 329                 /*
 330                  *      Setup packet buffers, aligned correctly.
 331                  */
 332                 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
 333                 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
 334                 for (i = 0; i < PKTBUFSRX; i++) {
 335                         NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
 336                 }
 337         }
 338
 339         if (!NetArpWaitTxPacket) {
 340                 NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
 341                 NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
 342                 NetArpWaitTxPacketSize = 0;
 343         }
 344
 345         eth_halt();
 346 #ifdef CONFIG_NET_MULTI
 347         eth_set_current();
 348 #endif
 349         if (eth_init(bd) < 0) {
 350                 eth_halt();
 351                 return(-1);
 352         }
 353
 354 restart:
 355 #ifdef CONFIG_NET_MULTI
 356         memcpy (NetOurEther, eth_get_dev()->enetaddr, 6);
 357 #else
 358         eth_getenv_enetaddr("ethaddr", NetOurEther);
 359 #endif
 360
 361         NetState = NETLOOP_CONTINUE;
 362
 363         /*
 364          *      Start the ball rolling with the given start function.  From
 365          *      here on, this code is a state machine driven by received
 366          *      packets and timer events.
 367          */
 368         NetInitLoop(protocol);
 369
 370         switch (net_check_prereq (protocol)) {
 371         case 1:
 372                 /* network not configured */
 373                 eth_halt();
 374                 return (-1);
 375
 376 #ifdef CONFIG_NET_MULTI
 377         case 2:
 378                 /* network device not configured */
 379                 break;
 380 #endif /* CONFIG_NET_MULTI */
 381
 382         case 0:
 383 #ifdef CONFIG_NET_MULTI
 384                 NetDevExists = 1;
 385 #endif
 386                 switch (protocol) {
 387                 case TFTP:
 388                         /* always use ARP to get server ethernet address */
 389                         TftpStart();
 390                         break;
 391
 392 #if defined(CONFIG_CMD_DHCP)
 393                 case DHCP:
 394                         BootpTry = 0;
 395                         NetOurIP = 0;
 396                         DhcpRequest();          /* Basically same as BOOTP */
 397                         break;
 398 #endif
 399
 400                 case BOOTP:
 401                         BootpTry = 0;
 402                         NetOurIP = 0;
 403                         BootpRequest ();
 404                         break;
 405
 406 #if defined(CONFIG_CMD_RARP)
 407                 case RARP:
 408                         RarpTry = 0;
 409                         NetOurIP = 0;
 410                         RarpRequest ();
 411                         break;
 412 #endif
 413 #if defined(CONFIG_CMD_PING)
 414                 case PING:
 415                         PingStart();
 416                         break;
 417 #endif
 418 #if defined(CONFIG_CMD_NFS)
 419                 case NFS:
 420                         NfsStart();
 421                         break;
 422 #endif
 423 #if defined(CONFIG_CMD_CDP)
 424                 case CDP:
 425                         CDPStart();
 426                         break;
 427 #endif
 428 #ifdef CONFIG_NETCONSOLE
 429                 case NETCONS:
 430                         NcStart();
 431                         break;
 432 #endif
 433 #if defined(CONFIG_CMD_SNTP)
 434                 case SNTP:
 435                         SntpStart();
 436                         break;
 437 #endif
 438 #if defined(CONFIG_CMD_DNS)
 439                 case DNS:
 440                         DnsStart();
 441                         break;
 442 #endif
 443                 default:
 444                         break;
 445                 }
 446
 447                 NetBootFileXferSize = 0;
 448                 break;
 449         }
 450
 451 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 452 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && defined(CONFIG_STATUS_LED) && defined(STATUS_LED_RED)
 453         /*
 454          * Echo the inverted link state to the fault LED.
 455          */
 456         if(miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) {
 457                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 458         } else {
 459                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 460         }
 461 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 462 #endif /* CONFIG_MII, ... */
 463
 464         /*
 465          *      Main packet reception loop.  Loop receiving packets until
 466          *      someone sets `NetState' to a state that terminates.
 467          */
 468         for (;;) {
 469                 WATCHDOG_RESET();
 470 #ifdef CONFIG_SHOW_ACTIVITY
 471                 {
 472                         extern void show_activity(int arg);
 473                         show_activity(1);
 474                 }
 475 #endif
 476                 /*
 477                  *      Check the ethernet for a new packet.  The ethernet
 478                  *      receive routine will process it.
 479                  */
 480                 eth_rx();
 481
 482                 /*
 483                  *      Abort if ctrl-c was pressed.
 484                  */
 485                 if (ctrlc()) {
 486                         eth_halt();
 487                         puts ("\nAbort\n");
 488                         return (-1);
 489                 }
 490
 491                 ArpTimeoutCheck();
 492
 493                 /*
 494                  *      Check for a timeout, and run the timeout handler
 495                  *      if we have one.
 496                  */
 497                 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
 498                         thand_f *x;
 499
 500 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 501 #  if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \
 502       defined(CONFIG_STATUS_LED) &&        \
 503       defined(STATUS_LED_RED)
 504                         /*
 505                          * Echo the inverted link state to the fault LED.
 506                          */
 507                         if(miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) {
 508                                 status_led_set (STATUS_LED_RED, STATUS_LED_OFF);
 509                         } else {
 510                                 status_led_set (STATUS_LED_RED, STATUS_LED_ON);
 511                         }
 512 #  endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 513 #endif /* CONFIG_MII, ... */
 514                         x = timeHandler;
 515                         timeHandler = (thand_f *)0;
 516                         (*x)();
 517                 }
 518
 519
 520                 switch (NetState) {
 521
 522                 case NETLOOP_RESTART:
 523 #ifdef CONFIG_NET_MULTI
 524                         NetRestarted = 1;
 525 #endif
 526                         goto restart;
 527
 528                 case NETLOOP_SUCCESS:
 529                         if (NetBootFileXferSize > 0) {
 530                                 char buf[20];
 531                                 printf("Bytes transferred = %ld (%lx hex)\n",
 532                                         NetBootFileXferSize,
 533                                         NetBootFileXferSize);
 534                                 sprintf(buf, "%lX", NetBootFileXferSize);
 535                                 setenv("filesize", buf);
 536
 537                                 sprintf(buf, "%lX", (unsigned long)load_addr);
 538                                 setenv("fileaddr", buf);
 539                         }
 540                         eth_halt();
 541                         return NetBootFileXferSize;
 542
 543                 case NETLOOP_FAIL:
 544                         return (-1);
 545                 }
 546         }
 547 }
 548
 549 /**********************************************************************/
 550
 551 static void
 552 startAgainTimeout(void)
 553 {
 554         NetState = NETLOOP_RESTART;
 555 }
 556
 557 static void
 558 startAgainHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
 559 {
 560         /* Totally ignore the packet */
 561 }
 562
 563 void NetStartAgain (void)
 564 {
 565         char *nretry;
 566         int retry_forever = 0;
 567         unsigned long retrycnt = 0;
 568
 569         nretry = getenv("netretry");
 570         if (nretry) {
 571                 if (!strcmp(nretry, "yes"))
 572                         retry_forever = 1;
 573                 else if (!strcmp(nretry, "no"))
 574                         retrycnt = 0;
 575                 else if (!strcmp(nretry, "once"))
 576                         retrycnt = 1;
 577                 else
 578                         retrycnt = simple_strtoul(nretry, NULL, 0);
 579         } else
 580                 retry_forever = 1;
 581
 582         if ((!retry_forever) && (NetTryCount >= retrycnt)) {
 583                 eth_halt();
 584                 NetState = NETLOOP_FAIL;
 585                 return;
 586         }
 587
 588         NetTryCount++;
 589
 590 #ifndef CONFIG_NET_MULTI
 591         NetSetTimeout (10000UL, startAgainTimeout);
 592         NetSetHandler (startAgainHandler);
 593 #else   /* !CONFIG_NET_MULTI*/
 594         eth_halt ();
 595 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
 596         eth_try_another (!NetRestarted);
 597 #endif
 598         eth_init (gd->bd);
 599         if (NetRestartWrap) {
 600                 NetRestartWrap = 0;
 601                 if (NetDevExists) {
 602                         NetSetTimeout (10000UL, startAgainTimeout);
 603                         NetSetHandler (startAgainHandler);
 604                 } else {
 605                         NetState = NETLOOP_FAIL;
 606                 }
 607         } else {
 608                 NetState = NETLOOP_RESTART;
 609         }
 610 #endif  /* CONFIG_NET_MULTI */
 611 }
 612
 613 /**********************************************************************/
 614 /*
 615  *      Miscelaneous bits.
 616  */
 617
 618 void
 619 NetSetHandler(rxhand_f * f)
 620 {
 621         packetHandler = f;
 622 }
 623
 624
 625 void
 626 NetSetTimeout(ulong iv, thand_f * f)
 627 {
 628         if (iv == 0) {
 629                 timeHandler = (thand_f *)0;
 630         } else {
 631                 timeHandler = f;
 632                 timeStart = get_timer(0);
 633                 timeDelta = iv;
 634         }
 635 }
 636
 637
 638 void
 639 NetSendPacket(volatile uchar * pkt, int len)
 640 {
 641         (void) eth_send(pkt, len);
 642 }
 643
 644 int
 645 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
 646 {
 647         uchar *pkt;
 648
 649         /* convert to new style broadcast */
 650         if (dest == 0)
 651                 dest = 0xFFFFFFFF;
 652
 653         /* if broadcast, make the ether address a broadcast and don't do ARP */
 654         if (dest == 0xFFFFFFFF)
 655                 ether = NetBcastAddr;
 656
 657         /* if MAC address was not discovered yet, save the packet and do an ARP request */
 658         if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
 659
 660                 debug("sending ARP for %08lx\n", dest);
 661
 662                 NetArpWaitPacketIP = dest;
 663                 NetArpWaitPacketMAC = ether;
 664
 665                 pkt = NetArpWaitTxPacket;
 666                 pkt += NetSetEther (pkt, NetArpWaitPacketMAC, PROT_IP);
 667
 668                 NetSetIP (pkt, dest, dport, sport, len);
 669                 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len);
 670
 671                 /* size of the waiting packet */
 672                 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE + len;
 673
 674                 /* and do the ARP request */
 675                 NetArpWaitTry = 1;
 676                 NetArpWaitTimerStart = get_timer(0);
 677                 ArpRequest();
 678                 return 1;       /* waiting */
 679         }
 680
 681         debug("sending UDP to %08lx/%pM\n", dest, ether);
 682
 683         pkt = (uchar *)NetTxPacket;
 684         pkt += NetSetEther (pkt, ether, PROT_IP);
 685         NetSetIP (pkt, dest, dport, sport, len);
 686         (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len);
 687
 688         return 0;       /* transmitted */
 689 }
 690
 691 #if defined(CONFIG_CMD_PING)
 692 static ushort PingSeqNo;
 693
 694 int PingSend(void)
 695 {
 696         static uchar mac[6];
 697         volatile IP_t *ip;
 698         volatile ushort *s;
 699         uchar *pkt;
 700
 701         /* XXX always send arp request */
 702
 703         memcpy(mac, NetEtherNullAddr, 6);
 704
 705         debug("sending ARP for %08lx\n", NetPingIP);
 706
 707         NetArpWaitPacketIP = NetPingIP;
 708         NetArpWaitPacketMAC = mac;
 709
 710         pkt = NetArpWaitTxPacket;
 711         pkt += NetSetEther(pkt, mac, PROT_IP);
 712
 713         ip = (volatile IP_t *)pkt;
 714
 715         /*
 716          *      Construct an IP and ICMP header.  (need to set no fragment bit - XXX)
 717          */
 718         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
 719         ip->ip_tos   = 0;
 720         ip->ip_len   = htons(IP_HDR_SIZE_NO_UDP + 8);
 721         ip->ip_id    = htons(NetIPID++);
 722         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
 723         ip->ip_ttl   = 255;
 724         ip->ip_p     = 0x01;            /* ICMP */
 725         ip->ip_sum   = 0;
 726         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
 727         NetCopyIP((void*)&ip->ip_dst, &NetPingIP);         /* - "" - */
 728         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
 729
 730         s = &ip->udp_src;               /* XXX ICMP starts here */
 731         s[0] = htons(0x0800);           /* echo-request, code */
 732         s[1] = 0;                       /* checksum */
 733         s[2] = 0;                       /* identifier */
 734         s[3] = htons(PingSeqNo++);      /* sequence number */
 735         s[1] = ~NetCksum((uchar *)s, 8/2);
 736
 737         /* size of the waiting packet */
 738         NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8;
 739
 740         /* and do the ARP request */
 741         NetArpWaitTry = 1;
 742         NetArpWaitTimerStart = get_timer(0);
 743         ArpRequest();
 744         return 1;       /* waiting */
 745 }
 746
 747 static void
 748 PingTimeout (void)
 749 {
 750         eth_halt();
 751         NetState = NETLOOP_FAIL;        /* we did not get the reply */
 752 }
 753
 754 static void
 755 PingHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
 756 {
 757         IPaddr_t tmp;
 758         volatile IP_t *ip = (volatile IP_t *)pkt;
 759
 760         tmp = NetReadIP((void *)&ip->ip_src);
 761         if (tmp != NetPingIP)
 762                 return;
 763
 764         NetState = NETLOOP_SUCCESS;
 765 }
 766
 767 static void PingStart(void)
 768 {
 769 #if defined(CONFIG_NET_MULTI)
 770         printf ("Using %s device\n", eth_get_name());
 771 #endif  /* CONFIG_NET_MULTI */
 772         NetSetTimeout (10000UL, PingTimeout);
 773         NetSetHandler (PingHandler);
 774
 775         PingSend();
 776 }
 777 #endif
 778
 779 #if defined(CONFIG_CMD_CDP)
 780
 781 #define CDP_DEVICE_ID_TLV               0x0001
 782 #define CDP_ADDRESS_TLV                 0x0002
 783 #define CDP_PORT_ID_TLV                 0x0003
 784 #define CDP_CAPABILITIES_TLV            0x0004
 785 #define CDP_VERSION_TLV                 0x0005
 786 #define CDP_PLATFORM_TLV                0x0006
 787 #define CDP_NATIVE_VLAN_TLV             0x000a
 788 #define CDP_APPLIANCE_VLAN_TLV          0x000e
 789 #define CDP_TRIGGER_TLV                 0x000f
 790 #define CDP_POWER_CONSUMPTION_TLV       0x0010
 791 #define CDP_SYSNAME_TLV                 0x0014
 792 #define CDP_SYSOBJECT_TLV               0x0015
 793 #define CDP_MANAGEMENT_ADDRESS_TLV      0x0016
 794
 795 #define CDP_TIMEOUT                     250UL   /* one packet every 250ms */
 796
 797 static int CDPSeq;
 798 static int CDPOK;
 799
 800 ushort CDPNativeVLAN;
 801 ushort CDPApplianceVLAN;
 802
 803 static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20, 0x00 };
 804
 805 static ushort CDP_compute_csum(const uchar *buff, ushort len)
 806 {
 807         ushort csum;
 808         int     odd;
 809         ulong   result = 0;
 810         ushort  leftover;
 811         ushort *p;
 812
 813         if (len > 0) {
 814                 odd = 1 & (ulong)buff;
 815                 if (odd) {
 816                         result = *buff << 8;
 817                         len--;
 818                         buff++;
 819                 }
 820                 while (len > 1) {
 821                         p = (ushort *)buff;
 822                         result += *p++;
 823                         buff = (uchar *)p;
 824                         if (result & 0x80000000)
 825                                 result = (result & 0xFFFF) + (result >> 16);
 826                         len -= 2;
 827                 }
 828                 if (len) {
 829                         leftover = (signed short)(*(const signed char *)buff);
 830                         /* CISCO SUCKS big time! (and blows too):
 831                          * CDP uses the IP checksum algorithm with a twist;
 832                          * for the last byte it *sign* extends and sums.
 833                          */
 834                         result = (result & 0xffff0000) | ((result + leftover) & 0x0000ffff);
 835                 }
 836                 while (result >> 16)
 837                         result = (result & 0xFFFF) + (result >> 16);
 838
 839                 if (odd)
 840                         result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
 841         }
 842
 843         /* add up 16-bit and 17-bit words for 17+c bits */
 844         result = (result & 0xffff) + (result >> 16);
 845         /* add up 16-bit and 2-bit for 16+c bit */
 846         result = (result & 0xffff) + (result >> 16);
 847         /* add up carry.. */
 848         result = (result & 0xffff) + (result >> 16);
 849
 850         /* negate */
 851         csum = ~(ushort)result;
 852
 853         /* run time endian detection */
 854         if (csum != htons(csum))        /* little endian */
 855                 csum = htons(csum);
 856
 857         return csum;
 858 }
 859
 860 int CDPSendTrigger(void)
 861 {
 862         volatile uchar *pkt;
 863         volatile ushort *s;
 864         volatile ushort *cp;
 865         Ethernet_t *et;
 866         int len;
 867         ushort chksum;
 868 #if defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID)   || \
 869     defined(CONFIG_CDP_VERSION)   || defined(CONFIG_CDP_PLATFORM)
 870         char buf[32];
 871 #endif
 872
 873         pkt = NetTxPacket;
 874         et = (Ethernet_t *)pkt;
 875
 876         /* NOTE: trigger sent not on any VLAN */
 877
 878         /* form ethernet header */
 879         memcpy(et->et_dest, NetCDPAddr, 6);
 880         memcpy(et->et_src, NetOurEther, 6);
 881
 882         pkt += ETHER_HDR_SIZE;
 883
 884         /* SNAP header */
 885         memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr));
 886         pkt += sizeof(CDP_SNAP_hdr);
 887
 888         /* CDP header */
 889         *pkt++ = 0x02;                          /* CDP version 2 */
 890         *pkt++ = 180;                           /* TTL */
 891         s = (volatile ushort *)pkt;
 892         cp = s;
 893         *s++ = htons(0);                        /* checksum (0 for later calculation) */
 894
 895         /* CDP fields */
 896 #ifdef CONFIG_CDP_DEVICE_ID
 897         *s++ = htons(CDP_DEVICE_ID_TLV);
 898         *s++ = htons(CONFIG_CDP_DEVICE_ID);
 899         sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%pm", NetOurEther);
 900         memcpy((uchar *)s, buf, 16);
 901         s += 16 / 2;
 902 #endif
 903
 904 #ifdef CONFIG_CDP_PORT_ID
 905         *s++ = htons(CDP_PORT_ID_TLV);
 906         memset(buf, 0, sizeof(buf));
 907         sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index());
 908         len = strlen(buf);
 909         if (len & 1)    /* make it even */
 910                 len++;
 911         *s++ = htons(len + 4);
 912         memcpy((uchar *)s, buf, len);
 913         s += len / 2;
 914 #endif
 915
 916 #ifdef CONFIG_CDP_CAPABILITIES
 917         *s++ = htons(CDP_CAPABILITIES_TLV);
 918         *s++ = htons(8);
 919         *(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES);
 920         s += 2;
 921 #endif
 922
 923 #ifdef CONFIG_CDP_VERSION
 924         *s++ = htons(CDP_VERSION_TLV);
 925         memset(buf, 0, sizeof(buf));
 926         strcpy(buf, CONFIG_CDP_VERSION);
 927         len = strlen(buf);
 928         if (len & 1)    /* make it even */
 929                 len++;
 930         *s++ = htons(len + 4);
 931         memcpy((uchar *)s, buf, len);
 932         s += len / 2;
 933 #endif
 934
 935 #ifdef CONFIG_CDP_PLATFORM
 936         *s++ = htons(CDP_PLATFORM_TLV);
 937         memset(buf, 0, sizeof(buf));
 938         strcpy(buf, CONFIG_CDP_PLATFORM);
 939         len = strlen(buf);
 940         if (len & 1)    /* make it even */
 941                 len++;
 942         *s++ = htons(len + 4);
 943         memcpy((uchar *)s, buf, len);
 944         s += len / 2;
 945 #endif
 946
 947 #ifdef CONFIG_CDP_TRIGGER
 948         *s++ = htons(CDP_TRIGGER_TLV);
 949         *s++ = htons(8);
 950         *(ulong *)s = htonl(CONFIG_CDP_TRIGGER);
 951         s += 2;
 952 #endif
 953
 954 #ifdef CONFIG_CDP_POWER_CONSUMPTION
 955         *s++ = htons(CDP_POWER_CONSUMPTION_TLV);
 956         *s++ = htons(6);
 957         *s++ = htons(CONFIG_CDP_POWER_CONSUMPTION);
 958 #endif
 959
 960         /* length of ethernet packet */
 961         len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE);
 962         et->et_protlen = htons(len);
 963
 964         len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr);
 965         chksum = CDP_compute_csum((uchar *)NetTxPacket + len, (uchar *)s - (NetTxPacket + len));
 966         if (chksum == 0)
 967                 chksum = 0xFFFF;
 968         *cp = htons(chksum);
 969
 970         (void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket);
 971         return 0;
 972 }
 973
 974 static void
 975 CDPTimeout (void)
 976 {
 977         CDPSeq++;
 978
 979         if (CDPSeq < 3) {
 980                 NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
 981                 CDPSendTrigger();
 982                 return;
 983         }
 984
 985         /* if not OK try again */
 986         if (!CDPOK)
 987                 NetStartAgain();
 988         else
 989                 NetState = NETLOOP_SUCCESS;
 990 }
 991
 992 static void
 993 CDPDummyHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
 994 {
 995         /* nothing */
 996 }
 997
 998 static void
 999 CDPHandler(const uchar * pkt, unsigned len)
1000 {
1001         const uchar *t;
1002         const ushort *ss;
1003         ushort type, tlen;
1004         uchar applid;
1005         ushort vlan, nvlan;
1006
1007         /* minimum size? */
1008         if (len < sizeof(CDP_SNAP_hdr) + 4)
1009                 goto pkt_short;
1010
1011         /* check for valid CDP SNAP header */
1012         if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0)
1013                 return;
1014
1015         pkt += sizeof(CDP_SNAP_hdr);
1016         len -= sizeof(CDP_SNAP_hdr);
1017
1018         /* Version of CDP protocol must be >= 2 and TTL != 0 */
1019         if (pkt[0] < 0x02 || pkt[1] == 0)
1020                 return;
1021
1022         /* if version is greater than 0x02 maybe we'll have a problem; output a warning */
1023         if (pkt[0] != 0x02)
1024                 printf("** WARNING: CDP packet received with a protocol version %d > 2\n",
1025                                 pkt[0] & 0xff);
1026
1027         if (CDP_compute_csum(pkt, len) != 0)
1028                 return;
1029
1030         pkt += 4;
1031         len -= 4;
1032
1033         vlan = htons(-1);
1034         nvlan = htons(-1);
1035         while (len > 0) {
1036                 if (len < 4)
1037                         goto pkt_short;
1038
1039                 ss = (const ushort *)pkt;
1040                 type = ntohs(ss[0]);
1041                 tlen = ntohs(ss[1]);
1042                 if (tlen > len) {
1043                         goto pkt_short;
1044                 }
1045
1046                 pkt += tlen;
1047                 len -= tlen;
1048
1049                 ss += 2;        /* point ss to the data of the TLV */
1050                 tlen -= 4;
1051
1052                 switch (type) {
1053                         case CDP_DEVICE_ID_TLV:
1054                                 break;
1055                         case CDP_ADDRESS_TLV:
1056                                 break;
1057                         case CDP_PORT_ID_TLV:
1058                                 break;
1059                         case CDP_CAPABILITIES_TLV:
1060                                 break;
1061                         case CDP_VERSION_TLV:
1062                                 break;
1063                         case CDP_PLATFORM_TLV:
1064                                 break;
1065                         case CDP_NATIVE_VLAN_TLV:
1066                                 nvlan = *ss;
1067                                 break;
1068                         case CDP_APPLIANCE_VLAN_TLV:
1069                                 t = (const uchar *)ss;
1070                                 while (tlen > 0) {
1071                                         if (tlen < 3)
1072                                                 goto pkt_short;
1073
1074                                         applid = t[0];
1075                                         ss = (const ushort *)(t + 1);
1076
1077 #ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE
1078                                         if (applid == CONFIG_CDP_APPLIANCE_VLAN_TYPE)
1079                                                 vlan = *ss;
1080 #else
1081                                         vlan = ntohs(*ss);      /* XXX will this work; dunno */
1082 #endif
1083                                         t += 3; tlen -= 3;
1084                                 }
1085                                 break;
1086                         case CDP_TRIGGER_TLV:
1087                                 break;
1088                         case CDP_POWER_CONSUMPTION_TLV:
1089                                 break;
1090                         case CDP_SYSNAME_TLV:
1091                                 break;
1092                         case CDP_SYSOBJECT_TLV:
1093                                 break;
1094                         case CDP_MANAGEMENT_ADDRESS_TLV:
1095                                 break;
1096                 }
1097         }
1098
1099         CDPApplianceVLAN = vlan;
1100         CDPNativeVLAN = nvlan;
1101
1102         CDPOK = 1;
1103         return;
1104
1105  pkt_short:
1106         printf("** CDP packet is too short\n");
1107         return;
1108 }
1109
1110 static void CDPStart(void)
1111 {
1112 #if defined(CONFIG_NET_MULTI)
1113         printf ("Using %s device\n", eth_get_name());
1114 #endif
1115         CDPSeq = 0;
1116         CDPOK = 0;
1117
1118         CDPNativeVLAN = htons(-1);
1119         CDPApplianceVLAN = htons(-1);
1120
1121         NetSetTimeout (CDP_TIMEOUT, CDPTimeout);
1122         NetSetHandler (CDPDummyHandler);
1123
1124         CDPSendTrigger();
1125 }
1126 #endif
1127
1128 #ifdef CONFIG_IP_DEFRAG
1129 /*
1130  * This function collects fragments in a single packet, according
1131  * to the algorithm in RFC815. It returns NULL or the pointer to
1132  * a complete packet, in static storage
1133  */
1134 #ifndef CONFIG_NET_MAXDEFRAG
1135 #define CONFIG_NET_MAXDEFRAG 16384
1136 #endif
1137 /*
1138  * MAXDEFRAG, above, is chosen in the config file and  is real data
1139  * so we need to add the NFS overhead, which is more than TFTP.
1140  * To use sizeof in the internal unnamed structures, we need a real
1141  * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately).
1142  * The compiler doesn't complain nor allocates the actual structure
1143  */
1144 static struct rpc_t rpc_specimen;
1145 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply))
1146
1147 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE_NO_UDP)
1148
1149 /*
1150  * this is the packet being assembled, either data or frag control.
1151  * Fragments go by 8 bytes, so this union must be 8 bytes long
1152  */
1153 struct hole {
1154         /* first_byte is address of this structure */
1155         u16 last_byte;  /* last byte in this hole + 1 (begin of next hole) */
1156         u16 next_hole;  /* index of next (in 8-b blocks), 0 == none */
1157         u16 prev_hole;  /* index of prev, 0 == none */
1158         u16 unused;
1159 };
1160
1161 static IP_t *__NetDefragment(IP_t *ip, int *lenp)
1162 {
1163         static uchar pkt_buff[IP_PKTSIZE] __attribute__((aligned(PKTALIGN)));
1164         static u16 first_hole, total_len;
1165         struct hole *payload, *thisfrag, *h, *newh;
1166         IP_t *localip = (IP_t *)pkt_buff;
1167         uchar *indata = (uchar *)ip;
1168         int offset8, start, len, done = 0;
1169         u16 ip_off = ntohs(ip->ip_off);
1170
1171         /* payload starts after IP header, this fragment is in there */
1172         payload = (struct hole *)(pkt_buff + IP_HDR_SIZE_NO_UDP);
1173         offset8 =  (ip_off & IP_OFFS);
1174         thisfrag = payload + offset8;
1175         start = offset8 * 8;
1176         len = ntohs(ip->ip_len) - IP_HDR_SIZE_NO_UDP;
1177
1178         if (start + len > IP_MAXUDP) /* fragment extends too far */
1179                 return NULL;
1180
1181         if (!total_len || localip->ip_id != ip->ip_id) {
1182                 /* new (or different) packet, reset structs */
1183                 total_len = 0xffff;
1184                 payload[0].last_byte = ~0;
1185                 payload[0].next_hole = 0;
1186                 payload[0].prev_hole = 0;
1187                 first_hole = 0;
1188                 /* any IP header will work, copy the first we received */
1189                 memcpy(localip, ip, IP_HDR_SIZE_NO_UDP);
1190         }
1191
1192         /*
1193          * What follows is the reassembly algorithm. We use the payload
1194          * array as a linked list of hole descriptors, as each hole starts
1195          * at a multiple of 8 bytes. However, last byte can be whatever value,
1196          * so it is represented as byte count, not as 8-byte blocks.
1197          */
1198
1199         h = payload + first_hole;
1200         while (h->last_byte < start) {
1201                 if (!h->next_hole) {
1202                         /* no hole that far away */
1203                         return NULL;
1204                 }
1205                 h = payload + h->next_hole;
1206         }
1207
1208         /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
1209         if (offset8 + ((len + 7) / 8) <= h - payload) {
1210                 /* no overlap with holes (dup fragment?) */
1211                 return NULL;
1212         }
1213
1214         if (!(ip_off & IP_FLAGS_MFRAG)) {
1215                 /* no more fragmentss: truncate this (last) hole */
1216                 total_len = start + len;
1217                 h->last_byte = start + len;
1218         }
1219
1220         /*
1221          * There is some overlap: fix the hole list. This code doesn't
1222          * deal with a fragment that overlaps with two different holes
1223          * (thus being a superset of a previously-received fragment).
1224          */
1225
1226         if ( (h >= thisfrag) && (h->last_byte <= start + len) ) {
1227                 /* complete overlap with hole: remove hole */
1228                 if (!h->prev_hole && !h->next_hole) {
1229                         /* last remaining hole */
1230                         done = 1;
1231                 } else if (!h->prev_hole) {
1232                         /* first hole */
1233                         first_hole = h->next_hole;
1234                         payload[h->next_hole].prev_hole = 0;
1235                 } else if (!h->next_hole) {
1236                         /* last hole */
1237                         payload[h->prev_hole].next_hole = 0;
1238                 } else {
1239                         /* in the middle of the list */
1240                         payload[h->next_hole].prev_hole = h->prev_hole;
1241                         payload[h->prev_hole].next_hole = h->next_hole;
1242                 }
1243
1244         } else if (h->last_byte <= start + len) {
1245                 /* overlaps with final part of the hole: shorten this hole */
1246                 h->last_byte = start;
1247
1248         } else if (h >= thisfrag) {
1249                 /* overlaps with initial part of the hole: move this hole */
1250                 newh = thisfrag + (len / 8);
1251                 *newh = *h;
1252                 h = newh;
1253                 if (h->next_hole)
1254                         payload[h->next_hole].prev_hole = (h - payload);
1255                 if (h->prev_hole)
1256                         payload[h->prev_hole].next_hole = (h - payload);
1257                 else
1258                         first_hole = (h - payload);
1259
1260         } else {
1261                 /* fragment sits in the middle: split the hole */
1262                 newh = thisfrag + (len / 8);
1263                 *newh = *h;
1264                 h->last_byte = start;
1265                 h->next_hole = (newh - payload);
1266                 newh->prev_hole = (h - payload);
1267                 if (newh->next_hole)
1268                         payload[newh->next_hole].prev_hole = (newh - payload);
1269         }
1270
1271         /* finally copy this fragment and possibly return whole packet */
1272         memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE_NO_UDP, len);
1273         if (!done)
1274                 return NULL;
1275
1276         localip->ip_len = htons(total_len);
1277         *lenp = total_len + IP_HDR_SIZE_NO_UDP;
1278         return localip;
1279 }
1280
1281 static inline IP_t *NetDefragment(IP_t *ip, int *lenp)
1282 {
1283         u16 ip_off = ntohs(ip->ip_off);
1284         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1285                 return ip; /* not a fragment */
1286         return __NetDefragment(ip, lenp);
1287 }
1288
1289 #else /* !CONFIG_IP_DEFRAG */
1290
1291 static inline IP_t *NetDefragment(IP_t *ip, int *lenp)
1292 {
1293         u16 ip_off = ntohs(ip->ip_off);
1294         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1295                 return ip; /* not a fragment */
1296         return NULL;
1297 }
1298 #endif
1299
1300 void
1301 NetReceive(volatile uchar * inpkt, int len)
1302 {
1303         Ethernet_t *et;
1304         IP_t    *ip;
1305         ARP_t   *arp;
1306         IPaddr_t tmp;
1307         int     x;
1308         uchar *pkt;
1309 #if defined(CONFIG_CMD_CDP)
1310         int iscdp;
1311 #endif
1312         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1313
1314         debug("packet received\n");
1315
1316         NetRxPacket = inpkt;
1317         NetRxPacketLen = len;
1318         et = (Ethernet_t *)inpkt;
1319
1320         /* too small packet? */
1321         if (len < ETHER_HDR_SIZE)
1322                 return;
1323
1324 #ifdef CONFIG_API
1325         if (push_packet) {
1326                 (*push_packet)(inpkt, len);
1327                 return;
1328         }
1329 #endif
1330
1331 #if defined(CONFIG_CMD_CDP)
1332         /* keep track if packet is CDP */
1333         iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0;
1334 #endif
1335
1336         myvlanid = ntohs(NetOurVLAN);
1337         if (myvlanid == (ushort)-1)
1338                 myvlanid = VLAN_NONE;
1339         mynvlanid = ntohs(NetOurNativeVLAN);
1340         if (mynvlanid == (ushort)-1)
1341                 mynvlanid = VLAN_NONE;
1342
1343         x = ntohs(et->et_protlen);
1344
1345         debug("packet received\n");
1346
1347         if (x < 1514) {
1348                 /*
1349                  *      Got a 802 packet.  Check the other protocol field.
1350                  */
1351                 x = ntohs(et->et_prot);
1352
1353                 ip = (IP_t *)(inpkt + E802_HDR_SIZE);
1354                 len -= E802_HDR_SIZE;
1355
1356         } else if (x != PROT_VLAN) {    /* normal packet */
1357                 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE);
1358                 len -= ETHER_HDR_SIZE;
1359
1360         } else {                        /* VLAN packet */
1361                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et;
1362
1363                 debug("VLAN packet received\n");
1364
1365                 /* too small packet? */
1366                 if (len < VLAN_ETHER_HDR_SIZE)
1367                         return;
1368
1369                 /* if no VLAN active */
1370                 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
1371 #if defined(CONFIG_CMD_CDP)
1372                                 && iscdp == 0
1373 #endif
1374                                 )
1375                         return;
1376
1377                 cti = ntohs(vet->vet_tag);
1378                 vlanid = cti & VLAN_IDMASK;
1379                 x = ntohs(vet->vet_type);
1380
1381                 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE);
1382                 len -= VLAN_ETHER_HDR_SIZE;
1383         }
1384
1385         debug("Receive from protocol 0x%x\n", x);
1386
1387 #if defined(CONFIG_CMD_CDP)
1388         if (iscdp) {
1389                 CDPHandler((uchar *)ip, len);
1390                 return;
1391         }
1392 #endif
1393
1394         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1395                 if (vlanid == VLAN_NONE)
1396                         vlanid = (mynvlanid & VLAN_IDMASK);
1397                 /* not matched? */
1398                 if (vlanid != (myvlanid & VLAN_IDMASK))
1399                         return;
1400         }
1401
1402         switch (x) {
1403
1404         case PROT_ARP:
1405                 /*
1406                  * We have to deal with two types of ARP packets:
1407                  * - REQUEST packets will be answered by sending  our
1408                  *   IP address - if we know it.
1409                  * - REPLY packates are expected only after we asked
1410                  *   for the TFTP server's or the gateway's ethernet
1411                  *   address; so if we receive such a packet, we set
1412                  *   the server ethernet address
1413                  */
1414                 debug("Got ARP\n");
1415
1416                 arp = (ARP_t *)ip;
1417                 if (len < ARP_HDR_SIZE) {
1418                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1419                         return;
1420                 }
1421                 if (ntohs(arp->ar_hrd) != ARP_ETHER) {
1422                         return;
1423                 }
1424                 if (ntohs(arp->ar_pro) != PROT_IP) {
1425                         return;
1426                 }
1427                 if (arp->ar_hln != 6) {
1428                         return;
1429                 }
1430                 if (arp->ar_pln != 4) {
1431                         return;
1432                 }
1433
1434                 if (NetOurIP == 0) {
1435                         return;
1436                 }
1437
1438                 if (NetReadIP(&arp->ar_data[16]) != NetOurIP) {
1439                         return;
1440                 }
1441
1442                 switch (ntohs(arp->ar_op)) {
1443                 case ARPOP_REQUEST:             /* reply with our IP address    */
1444                         debug("Got ARP REQUEST, return our IP\n");
1445                         pkt = (uchar *)et;
1446                         pkt += NetSetEther(pkt, et->et_src, PROT_ARP);
1447                         arp->ar_op = htons(ARPOP_REPLY);
1448                         memcpy   (&arp->ar_data[10], &arp->ar_data[0], 6);
1449                         NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
1450                         memcpy   (&arp->ar_data[ 0], NetOurEther, 6);
1451                         NetCopyIP(&arp->ar_data[ 6], &NetOurIP);
1452                         (void) eth_send((uchar *)et, (pkt - (uchar *)et) + ARP_HDR_SIZE);
1453                         return;
1454
1455                 case ARPOP_REPLY:               /* arp reply */
1456                         /* are we waiting for a reply */
1457                         if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
1458                                 break;
1459
1460 #ifdef CONFIG_KEEP_SERVERADDR
1461                         if (NetServerIP == NetArpWaitPacketIP) {
1462                                 char buf[20];
1463                                 sprintf(buf, "%pM", arp->ar_data);
1464                                 setenv("serveraddr", buf);
1465                         }
1466 #endif
1467
1468                         debug("Got ARP REPLY, set server/gtwy eth addr (%pM)\n",
1469                                 arp->ar_data);
1470
1471                         tmp = NetReadIP(&arp->ar_data[6]);
1472
1473                         /* matched waiting packet's address */
1474                         if (tmp == NetArpWaitReplyIP) {
1475                                 debug("Got it\n");
1476                                 /* save address for later use */
1477                                 memcpy(NetArpWaitPacketMAC, &arp->ar_data[0], 6);
1478
1479 #ifdef CONFIG_NETCONSOLE
1480                                 (*packetHandler)(0,0,0,0);
1481 #endif
1482                                 /* modify header, and transmit it */
1483                                 memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6);
1484                                 (void) eth_send(NetArpWaitTxPacket, NetArpWaitTxPacketSize);
1485
1486                                 /* no arp request pending now */
1487                                 NetArpWaitPacketIP = 0;
1488                                 NetArpWaitTxPacketSize = 0;
1489                                 NetArpWaitPacketMAC = NULL;
1490
1491                         }
1492                         return;
1493                 default:
1494                         debug("Unexpected ARP opcode 0x%x\n", ntohs(arp->ar_op));
1495                         return;
1496                 }
1497                 break;
1498
1499 #ifdef CONFIG_CMD_RARP
1500         case PROT_RARP:
1501                 debug("Got RARP\n");
1502                 arp = (ARP_t *)ip;
1503                 if (len < ARP_HDR_SIZE) {
1504                         printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
1505                         return;
1506                 }
1507
1508                 if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
1509                         (ntohs(arp->ar_hrd) != ARP_ETHER)   ||
1510                         (ntohs(arp->ar_pro) != PROT_IP)     ||
1511                         (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
1512
1513                         puts ("invalid RARP header\n");
1514                 } else {
1515                         NetCopyIP(&NetOurIP,    &arp->ar_data[16]);
1516                         if (NetServerIP == 0)
1517                                 NetCopyIP(&NetServerIP, &arp->ar_data[ 6]);
1518                         memcpy (NetServerEther, &arp->ar_data[ 0], 6);
1519
1520                         (*packetHandler)(0,0,0,0);
1521                 }
1522                 break;
1523 #endif
1524         case PROT_IP:
1525                 debug("Got IP\n");
1526                 /* Before we start poking the header, make sure it is there */
1527                 if (len < IP_HDR_SIZE) {
1528                         debug("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE);
1529                         return;
1530                 }
1531                 /* Check the packet length */
1532                 if (len < ntohs(ip->ip_len)) {
1533                         printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
1534                         return;
1535                 }
1536                 len = ntohs(ip->ip_len);
1537                 debug("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
1538
1539                 /* Can't deal with anything except IPv4 */
1540                 if ((ip->ip_hl_v & 0xf0) != 0x40) {
1541                         return;
1542                 }
1543                 /* Can't deal with IP options (headers != 20 bytes) */
1544                 if ((ip->ip_hl_v & 0x0f) > 0x05) {
1545                         return;
1546                 }
1547                 /* Check the Checksum of the header */
1548                 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
1549                         puts ("checksum bad\n");
1550                         return;
1551                 }
1552                 /* If it is not for us, ignore it */
1553                 tmp = NetReadIP(&ip->ip_dst);
1554                 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
1555 #ifdef CONFIG_MCAST_TFTP
1556                         if (Mcast_addr != tmp)
1557 #endif
1558                         return;
1559                 }
1560                 /*
1561                  * The function returns the unchanged packet if it's not
1562                  * a fragment, and either the complete packet or NULL if
1563                  * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1564                  */
1565                 if (!(ip = NetDefragment(ip, &len)))
1566                         return;
1567                 /*
1568                  * watch for ICMP host redirects
1569                  *
1570                  * There is no real handler code (yet). We just watch
1571                  * for ICMP host redirect messages. In case anybody
1572                  * sees these messages: please contact me
1573                  * (wd@denx.de), or - even better - send me the
1574                  * necessary fixes :-)
1575                  *
1576                  * Note: in all cases where I have seen this so far
1577                  * it was a problem with the router configuration,
1578                  * for instance when a router was configured in the
1579                  * BOOTP reply, but the TFTP server was on the same
1580                  * subnet. So this is probably a warning that your
1581                  * configuration might be wrong. But I'm not really
1582                  * sure if there aren't any other situations.
1583                  */
1584                 if (ip->ip_p == IPPROTO_ICMP) {
1585                         ICMP_t *icmph = (ICMP_t *)&(ip->udp_src);
1586
1587                         switch (icmph->type) {
1588                         case ICMP_REDIRECT:
1589                                 if (icmph->code != ICMP_REDIR_HOST)
1590                                         return;
1591                                 printf (" ICMP Host Redirect to %pI4 ", &icmph->un.gateway);
1592                                 return;
1593 #if defined(CONFIG_CMD_PING)
1594                         case ICMP_ECHO_REPLY:
1595                                 /*
1596                                  *      IP header OK.  Pass the packet to the current handler.
1597                                  */
1598                                 /* XXX point to ip packet */
1599                                 (*packetHandler)((uchar *)ip, 0, 0, 0);
1600                                 return;
1601                         case ICMP_ECHO_REQUEST:
1602                                 debug("Got ICMP ECHO REQUEST, return %d bytes \n",
1603                                         ETHER_HDR_SIZE + len);
1604
1605                                 memcpy (&et->et_dest[0], &et->et_src[0], 6);
1606                                 memcpy (&et->et_src[ 0], NetOurEther, 6);
1607
1608                                 ip->ip_sum = 0;
1609                                 ip->ip_off = 0;
1610                                 NetCopyIP((void*)&ip->ip_dst, &ip->ip_src);
1611                                 NetCopyIP((void*)&ip->ip_src, &NetOurIP);
1612                                 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP >> 1);
1613
1614                                 icmph->type = ICMP_ECHO_REPLY;
1615                                 icmph->checksum = 0;
1616                                 icmph->checksum = ~NetCksum((uchar *)icmph,
1617                                                 (len - IP_HDR_SIZE_NO_UDP) >> 1);
1618                                 (void) eth_send((uchar *)et, ETHER_HDR_SIZE + len);
1619                                 return;
1620 #endif
1621                         default:
1622                                 return;
1623                         }
1624                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1625                         return;
1626                 }
1627
1628 #ifdef CONFIG_UDP_CHECKSUM
1629                 if (ip->udp_xsum != 0) {
1630                         ulong   xsum;
1631                         ushort *sumptr;
1632                         ushort  sumlen;
1633
1634                         xsum  = ip->ip_p;
1635                         xsum += (ntohs(ip->udp_len));
1636                         xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
1637                         xsum += (ntohl(ip->ip_src) >>  0) & 0x0000ffff;
1638                         xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
1639                         xsum += (ntohl(ip->ip_dst) >>  0) & 0x0000ffff;
1640
1641                         sumlen = ntohs(ip->udp_len);
1642                         sumptr = (ushort *) &(ip->udp_src);
1643
1644                         while (sumlen > 1) {
1645                                 ushort sumdata;
1646
1647                                 sumdata = *sumptr++;
1648                                 xsum += ntohs(sumdata);
1649                                 sumlen -= 2;
1650                         }
1651                         if (sumlen > 0) {
1652                                 ushort sumdata;
1653
1654                                 sumdata = *(unsigned char *) sumptr;
1655                                 sumdata = (sumdata << 8) & 0xff00;
1656                                 xsum += sumdata;
1657                         }
1658                         while ((xsum >> 16) != 0) {
1659                                 xsum = (xsum & 0x0000ffff) + ((xsum >> 16) & 0x0000ffff);
1660                         }
1661                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1662                                 printf(" UDP wrong checksum %08lx %08x\n",
1663                                         xsum, ntohs(ip->udp_xsum));
1664                                 return;
1665                         }
1666                 }
1667 #endif
1668
1669
1670 #ifdef CONFIG_NETCONSOLE
1671                 nc_input_packet((uchar *)ip +IP_HDR_SIZE,
1672                                                 ntohs(ip->udp_dst),
1673                                                 ntohs(ip->udp_src),
1674                                                 ntohs(ip->udp_len) - 8);
1675 #endif
1676                 /*
1677                  *      IP header OK.  Pass the packet to the current handler.
1678                  */
1679                 (*packetHandler)((uchar *)ip +IP_HDR_SIZE,
1680                                                 ntohs(ip->udp_dst),
1681                                                 ntohs(ip->udp_src),
1682                                                 ntohs(ip->udp_len) - 8);
1683                 break;
1684         }
1685 }
1686
1687
1688 /**********************************************************************/
1689
1690 static int net_check_prereq (proto_t protocol)
1691 {
1692         switch (protocol) {
1693                 /* Fall through */
1694 #if defined(CONFIG_CMD_PING)
1695         case PING:
1696                 if (NetPingIP == 0) {
1697                         puts ("*** ERROR: ping address not given\n");
1698                         return (1);
1699                 }
1700                 goto common;
1701 #endif
1702 #if defined(CONFIG_CMD_SNTP)
1703         case SNTP:
1704                 if (NetNtpServerIP == 0) {
1705                         puts ("*** ERROR: NTP server address not given\n");
1706                         return (1);
1707                 }
1708                 goto common;
1709 #endif
1710 #if defined(CONFIG_CMD_DNS)
1711         case DNS:
1712                 if (NetOurDNSIP == 0) {
1713                         puts("*** ERROR: DNS server address not given\n");
1714                         return 1;
1715                 }
1716                 goto common;
1717 #endif
1718 #if defined(CONFIG_CMD_NFS)
1719         case NFS:
1720 #endif
1721         case NETCONS:
1722         case TFTP:
1723                 if (NetServerIP == 0) {
1724                         puts ("*** ERROR: `serverip' not set\n");
1725                         return (1);
1726                 }
1727 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP)
1728     common:
1729 #endif
1730
1731                 if (NetOurIP == 0) {
1732                         puts ("*** ERROR: `ipaddr' not set\n");
1733                         return (1);
1734                 }
1735                 /* Fall through */
1736
1737 #ifdef CONFIG_CMD_RARP
1738         case RARP:
1739 #endif
1740         case BOOTP:
1741         case CDP:
1742         case DHCP:
1743                 if (memcmp (NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
1744 #ifdef CONFIG_NET_MULTI
1745                         extern int eth_get_dev_index (void);
1746                         int num = eth_get_dev_index ();
1747
1748                         switch (num) {
1749                         case -1:
1750                                 puts ("*** ERROR: No ethernet found.\n");
1751                                 return (1);
1752                         case 0:
1753                                 puts ("*** ERROR: `ethaddr' not set\n");
1754                                 break;
1755                         default:
1756                                 printf ("*** ERROR: `eth%daddr' not set\n",
1757                                         num);
1758                                 break;
1759                         }
1760
1761                         NetStartAgain ();
1762                         return (2);
1763 #else
1764                         puts ("*** ERROR: `ethaddr' not set\n");
1765                         return (1);
1766 #endif
1767                 }
1768                 /* Fall through */
1769         default:
1770                 return (0);
1771         }
1772         return (0);             /* OK */
1773 }
1774 /**********************************************************************/
1775
1776 int
1777 NetCksumOk(uchar * ptr, int len)
1778 {
1779         return !((NetCksum(ptr, len) + 1) & 0xfffe);
1780 }
1781
1782
1783 unsigned
1784 NetCksum(uchar * ptr, int len)
1785 {
1786         ulong   xsum;
1787         ushort *p = (ushort *)ptr;
1788
1789         xsum = 0;
1790         while (len-- > 0)
1791                 xsum += *p++;
1792         xsum = (xsum & 0xffff) + (xsum >> 16);
1793         xsum = (xsum & 0xffff) + (xsum >> 16);
1794         return (xsum & 0xffff);
1795 }
1796
1797 int
1798 NetEthHdrSize(void)
1799 {
1800         ushort myvlanid;
1801
1802         myvlanid = ntohs(NetOurVLAN);
1803         if (myvlanid == (ushort)-1)
1804                 myvlanid = VLAN_NONE;
1805
1806         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : VLAN_ETHER_HDR_SIZE;
1807 }
1808
1809 int
1810 NetSetEther(volatile uchar * xet, uchar * addr, uint prot)
1811 {
1812         Ethernet_t *et = (Ethernet_t *)xet;
1813         ushort myvlanid;
1814
1815         myvlanid = ntohs(NetOurVLAN);
1816         if (myvlanid == (ushort)-1)
1817                 myvlanid = VLAN_NONE;
1818
1819         memcpy (et->et_dest, addr, 6);
1820         memcpy (et->et_src, NetOurEther, 6);
1821         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1822         et->et_protlen = htons(prot);
1823                 return ETHER_HDR_SIZE;
1824         } else {
1825                 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet;
1826
1827                 vet->vet_vlan_type = htons(PROT_VLAN);
1828                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1829                 vet->vet_type = htons(prot);
1830                 return VLAN_ETHER_HDR_SIZE;
1831         }
1832 }
1833
1834 void
1835 NetSetIP(volatile uchar * xip, IPaddr_t dest, int dport, int sport, int len)
1836 {
1837         IP_t *ip = (IP_t *)xip;
1838
1839         /*
1840          *      If the data is an odd number of bytes, zero the
1841          *      byte after the last byte so that the checksum
1842          *      will work.
1843          */
1844         if (len & 1)
1845                 xip[IP_HDR_SIZE + len] = 0;
1846
1847         /*
1848          *      Construct an IP and UDP header.
1849          *      (need to set no fragment bit - XXX)
1850          */
1851         ip->ip_hl_v  = 0x45;            /* IP_HDR_SIZE / 4 (not including UDP) */
1852         ip->ip_tos   = 0;
1853         ip->ip_len   = htons(IP_HDR_SIZE + len);
1854         ip->ip_id    = htons(NetIPID++);
1855         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1856         ip->ip_ttl   = 255;
1857         ip->ip_p     = 17;              /* UDP */
1858         ip->ip_sum   = 0;
1859         NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
1860         NetCopyIP((void*)&ip->ip_dst, &dest);      /* - "" - */
1861         ip->udp_src  = htons(sport);
1862         ip->udp_dst  = htons(dport);
1863         ip->udp_len  = htons(8 + len);
1864         ip->udp_xsum = 0;
1865         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
1866 }
1867
1868 void copy_filename (char *dst, char *src, int size)
1869 {
1870         if (*src && (*src == '"')) {
1871                 ++src;
1872                 --size;
1873         }
1874
1875         while ((--size > 0) && *src && (*src != '"')) {
1876                 *dst++ = *src++;
1877         }
1878         *dst = '\0';
1879 }
1880
1881 #if defined(CONFIG_CMD_NFS) || defined(CONFIG_CMD_SNTP) || defined(CONFIG_CMD_DNS)
1882 /*
1883  * make port a little random (1024-17407)
1884  * This keeps the math somewhat trivial to compute, and seems to work with
1885  * all supported protocols/clients/servers
1886  */
1887 unsigned int random_port(void)
1888 {
1889         return 1024 + (get_timer(0) % 0x4000);
1890 }
1891 #endif
1892
1893 void ip_to_string (IPaddr_t x, char *s)
1894 {
1895         x = ntohl (x);
1896         sprintf (s, "%d.%d.%d.%d",
1897                  (int) ((x >> 24) & 0xff),
1898                  (int) ((x >> 16) & 0xff),
1899                  (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
1900         );
1901 }
1902
1903 void VLAN_to_string(ushort x, char *s)
1904 {
1905         x = ntohs(x);
1906
1907         if (x == (ushort)-1)
1908                 x = VLAN_NONE;
1909
1910         if (x == VLAN_NONE)
1911                 strcpy(s, "none");
1912         else
1913                 sprintf(s, "%d", x & VLAN_IDMASK);
1914 }
1915
1916 ushort string_to_VLAN(char *s)
1917 {
1918         ushort id;
1919
1920         if (s == NULL)
1921                 return htons(VLAN_NONE);
1922
1923         if (*s < '0' || *s > '9')
1924                 id = VLAN_NONE;
1925         else
1926                 id = (ushort)simple_strtoul(s, NULL, 10);
1927
1928         return htons(id);
1929 }
1930
1931 ushort getenv_VLAN(char *var)
1932 {
1933         return (string_to_VLAN(getenv(var)));
1934 }