net/net.c

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