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