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  * LINK_LOCAL:
  27  *
  28  *      Prerequisites:  - own ethernet address
  29  *      We want:        - own IP address
  30  *      Next step:      ARP
  31  *
  32  * RARP:
  33  *
  34  *      Prerequisites:  - own ethernet address
  35  *      We want:        - own IP address
  36  *                      - TFTP server IP address
  37  *      Next step:      ARP
  38  *
  39  * ARP:
  40  *
  41  *      Prerequisites:  - own ethernet address
  42  *                      - own IP address
  43  *                      - TFTP server IP address
  44  *      We want:        - TFTP server ethernet address
  45  *      Next step:      TFTP
  46  *
  47  * DHCP:
  48  *
  49  *     Prerequisites:   - own ethernet address
  50  *     We want:         - IP, Netmask, ServerIP, Gateway IP
  51  *                      - bootfilename, lease time
  52  *     Next step:       - TFTP
  53  *
  54  * TFTP:
  55  *
  56  *      Prerequisites:  - own ethernet address
  57  *                      - own IP address
  58  *                      - TFTP server IP address
  59  *                      - TFTP server ethernet address
  60  *                      - name of bootfile (if unknown, we use a default name
  61  *                        derived from our own IP address)
  62  *      We want:        - load the boot file
  63  *      Next step:      none
  64  *
  65  * NFS:
  66  *
  67  *      Prerequisites:  - own ethernet address
  68  *                      - own IP address
  69  *                      - name of bootfile (if unknown, we use a default name
  70  *                        derived from our own IP address)
  71  *      We want:        - load the boot file
  72  *      Next step:      none
  73  *
  74  * SNTP:
  75  *
  76  *      Prerequisites:  - own ethernet address
  77  *                      - own IP address
  78  *      We want:        - network time
  79  *      Next step:      none
  80  */
  81
  82
  83 #include <common.h>
  84 #include <command.h>
  85 #include <environment.h>
  86 #include <net.h>
  87 #if defined(CONFIG_STATUS_LED)
  88 #include <miiphy.h>
  89 #include <status_led.h>
  90 #endif
  91 #include <watchdog.h>
  92 #include <linux/compiler.h>
  93 #include "arp.h"
  94 #include "bootp.h"
  95 #include "cdp.h"
  96 #if defined(CONFIG_CMD_DNS)
  97 #include "dns.h"
  98 #endif
  99 #include "link_local.h"
 100 #include "nfs.h"
 101 #include "ping.h"
 102 #include "rarp.h"
 103 #if defined(CONFIG_CMD_SNTP)
 104 #include "sntp.h"
 105 #endif
 106 #include "tftp.h"
 107
 108 DECLARE_GLOBAL_DATA_PTR;
 109
 110 /** BOOTP EXTENTIONS **/
 111
 112 /* Our subnet mask (0=unknown) */
 113 IPaddr_t        NetOurSubnetMask;
 114 /* Our gateways IP address */
 115 IPaddr_t        NetOurGatewayIP;
 116 /* Our DNS IP address */
 117 IPaddr_t        NetOurDNSIP;
 118 #if defined(CONFIG_BOOTP_DNS2)
 119 /* Our 2nd DNS IP address */
 120 IPaddr_t        NetOurDNS2IP;
 121 #endif
 122 /* Our NIS domain */
 123 char            NetOurNISDomain[32] = {0,};
 124 /* Our hostname */
 125 char            NetOurHostName[32] = {0,};
 126 /* Our bootpath */
 127 char            NetOurRootPath[64] = {0,};
 128 /* Our bootfile size in blocks */
 129 ushort          NetBootFileSize;
 130
 131 #ifdef CONFIG_MCAST_TFTP        /* Multicast TFTP */
 132 IPaddr_t Mcast_addr;
 133 #endif
 134
 135 /** END OF BOOTP EXTENTIONS **/
 136
 137 /* The actual transferred size of the bootfile (in bytes) */
 138 ulong           NetBootFileXferSize;
 139 /* Our ethernet address */
 140 uchar           NetOurEther[6];
 141 /* Boot server enet address */
 142 uchar           NetServerEther[6];
 143 /* Our IP addr (0 = unknown) */
 144 IPaddr_t        NetOurIP;
 145 /* Server IP addr (0 = unknown) */
 146 IPaddr_t        NetServerIP;
 147 /* Current receive packet */
 148 uchar *NetRxPacket;
 149 /* Current rx packet length */
 150 int             NetRxPacketLen;
 151 /* IP packet ID */
 152 unsigned        NetIPID;
 153 /* Ethernet bcast address */
 154 uchar           NetBcastAddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 155 uchar           NetEtherNullAddr[6];
 156 #ifdef CONFIG_API
 157 void            (*push_packet)(void *, int len) = 0;
 158 #endif
 159 /* Network loop state */
 160 enum net_loop_state net_state;
 161 /* Tried all network devices */
 162 int             NetRestartWrap;
 163 /* Network loop restarted */
 164 static int      NetRestarted;
 165 /* At least one device configured */
 166 static int      NetDevExists;
 167
 168 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
 169 /* default is without VLAN */
 170 ushort          NetOurVLAN = 0xFFFF;
 171 /* ditto */
 172 ushort          NetOurNativeVLAN = 0xFFFF;
 173
 174 /* Boot File name */
 175 char            BootFile[128];
 176
 177 #if defined(CONFIG_CMD_SNTP)
 178 /* NTP server IP address */
 179 IPaddr_t        NetNtpServerIP;
 180 /* offset time from UTC */
 181 int             NetTimeOffset;
 182 #endif
 183
 184 static uchar PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 185
 186 /* Receive packet */
 187 uchar *NetRxPackets[PKTBUFSRX];
 188
 189 /* Current UDP RX packet handler */
 190 static rxhand_f *udp_packet_handler;
 191 /* Current ARP RX packet handler */
 192 static rxhand_f *arp_packet_handler;
 193 #ifdef CONFIG_CMD_TFTPPUT
 194 /* Current ICMP rx handler */
 195 static rxhand_icmp_f *packet_icmp_handler;
 196 #endif
 197 /* Current timeout handler */
 198 static thand_f *timeHandler;
 199 /* Time base value */
 200 static ulong    timeStart;
 201 /* Current timeout value */
 202 static ulong    timeDelta;
 203 /* THE transmit packet */
 204 uchar *NetTxPacket;
 205
 206 static int net_check_prereq(enum proto_t protocol);
 207
 208 static int NetTryCount;
 209
 210 int __maybe_unused net_busy_flag;
 211
 212 /**********************************************************************/
 213
 214 static int on_bootfile(const char *name, const char *value, enum env_op op,
 215         int flags)
 216 {
 217         switch (op) {
 218         case env_op_create:
 219         case env_op_overwrite:
 220                 copy_filename(BootFile, value, sizeof(BootFile));
 221                 break;
 222         default:
 223                 break;
 224         }
 225
 226         return 0;
 227 }
 228 U_BOOT_ENV_CALLBACK(bootfile, on_bootfile);
 229
 230 /*
 231  * Check if autoload is enabled. If so, use either NFS or TFTP to download
 232  * the boot file.
 233  */
 234 void net_auto_load(void)
 235 {
 236 #if defined(CONFIG_CMD_NFS)
 237         const char *s = getenv("autoload");
 238
 239         if (s != NULL && strcmp(s, "NFS") == 0) {
 240                 /*
 241                  * Use NFS to load the bootfile.
 242                  */
 243                 NfsStart();
 244                 return;
 245         }
 246 #endif
 247         if (getenv_yesno("autoload") == 0) {
 248                 /*
 249                  * Just use BOOTP/RARP to configure system;
 250                  * Do not use TFTP to load the bootfile.
 251                  */
 252                 net_set_state(NETLOOP_SUCCESS);
 253                 return;
 254         }
 255         TftpStart(TFTPGET);
 256 }
 257
 258 static void NetInitLoop(void)
 259 {
 260         static int env_changed_id;
 261         int env_id = get_env_id();
 262
 263         /* update only when the environment has changed */
 264         if (env_changed_id != env_id) {
 265                 NetOurIP = getenv_IPaddr("ipaddr");
 266                 NetOurGatewayIP = getenv_IPaddr("gatewayip");
 267                 NetOurSubnetMask = getenv_IPaddr("netmask");
 268                 NetServerIP = getenv_IPaddr("serverip");
 269                 NetOurNativeVLAN = getenv_VLAN("nvlan");
 270                 NetOurVLAN = getenv_VLAN("vlan");
 271 #if defined(CONFIG_CMD_DNS)
 272                 NetOurDNSIP = getenv_IPaddr("dnsip");
 273 #endif
 274                 env_changed_id = env_id;
 275         }
 276         if (eth_get_dev())
 277                 memcpy(NetOurEther, eth_get_dev()->enetaddr, 6);
 278
 279         return;
 280 }
 281
 282 static void net_clear_handlers(void)
 283 {
 284         net_set_udp_handler(NULL);
 285         net_set_arp_handler(NULL);
 286         NetSetTimeout(0, NULL);
 287 }
 288
 289 static void net_cleanup_loop(void)
 290 {
 291         net_clear_handlers();
 292 }
 293
 294 void net_init(void)
 295 {
 296         static int first_call = 1;
 297
 298         if (first_call) {
 299                 /*
 300                  *      Setup packet buffers, aligned correctly.
 301                  */
 302                 int i;
 303
 304                 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
 305                 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
 306                 for (i = 0; i < PKTBUFSRX; i++)
 307                         NetRxPackets[i] = NetTxPacket + (i + 1) * PKTSIZE_ALIGN;
 308
 309                 ArpInit();
 310                 net_clear_handlers();
 311
 312                 /* Only need to setup buffer pointers once. */
 313                 first_call = 0;
 314         }
 315
 316         NetInitLoop();
 317 }
 318
 319 /**********************************************************************/
 320 /*
 321  *      Main network processing loop.
 322  */
 323
 324 int NetLoop(enum proto_t protocol)
 325 {
 326         bd_t *bd = gd->bd;
 327         int ret = -1;
 328
 329         NetRestarted = 0;
 330         NetDevExists = 0;
 331         NetTryCount = 1;
 332         debug_cond(DEBUG_INT_STATE, "--- NetLoop Entry\n");
 333
 334         bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
 335         net_init();
 336         if (eth_is_on_demand_init() || protocol != NETCONS) {
 337                 eth_halt();
 338                 eth_set_current();
 339                 if (eth_init(bd) < 0) {
 340                         eth_halt();
 341                         return -1;
 342                 }
 343         } else
 344                 eth_init_state_only(bd);
 345
 346 restart:
 347 #ifdef CONFIG_USB_KEYBOARD
 348         net_busy_flag = 0;
 349 #endif
 350         net_set_state(NETLOOP_CONTINUE);
 351
 352         /*
 353          *      Start the ball rolling with the given start function.  From
 354          *      here on, this code is a state machine driven by received
 355          *      packets and timer events.
 356          */
 357         debug_cond(DEBUG_INT_STATE, "--- NetLoop Init\n");
 358         NetInitLoop();
 359
 360         switch (net_check_prereq(protocol)) {
 361         case 1:
 362                 /* network not configured */
 363                 eth_halt();
 364                 return -1;
 365
 366         case 2:
 367                 /* network device not configured */
 368                 break;
 369
 370         case 0:
 371                 NetDevExists = 1;
 372                 NetBootFileXferSize = 0;
 373                 switch (protocol) {
 374                 case TFTPGET:
 375 #ifdef CONFIG_CMD_TFTPPUT
 376                 case TFTPPUT:
 377 #endif
 378                         /* always use ARP to get server ethernet address */
 379                         TftpStart(protocol);
 380                         break;
 381 #ifdef CONFIG_CMD_TFTPSRV
 382                 case TFTPSRV:
 383                         TftpStartServer();
 384                         break;
 385 #endif
 386 #if defined(CONFIG_CMD_DHCP)
 387                 case DHCP:
 388                         BootpTry = 0;
 389                         NetOurIP = 0;
 390                         DhcpRequest();          /* Basically same as BOOTP */
 391                         break;
 392 #endif
 393
 394                 case BOOTP:
 395                         BootpTry = 0;
 396                         NetOurIP = 0;
 397                         BootpRequest();
 398                         break;
 399
 400 #if defined(CONFIG_CMD_RARP)
 401                 case RARP:
 402                         RarpTry = 0;
 403                         NetOurIP = 0;
 404                         RarpRequest();
 405                         break;
 406 #endif
 407 #if defined(CONFIG_CMD_PING)
 408                 case PING:
 409                         ping_start();
 410                         break;
 411 #endif
 412 #if defined(CONFIG_CMD_NFS)
 413                 case NFS:
 414                         NfsStart();
 415                         break;
 416 #endif
 417 #if defined(CONFIG_CMD_CDP)
 418                 case CDP:
 419                         CDPStart();
 420                         break;
 421 #endif
 422 #ifdef CONFIG_NETCONSOLE
 423                 case NETCONS:
 424                         NcStart();
 425                         break;
 426 #endif
 427 #if defined(CONFIG_CMD_SNTP)
 428                 case SNTP:
 429                         SntpStart();
 430                         break;
 431 #endif
 432 #if defined(CONFIG_CMD_DNS)
 433                 case DNS:
 434                         DnsStart();
 435                         break;
 436 #endif
 437 #if defined(CONFIG_CMD_LINK_LOCAL)
 438                 case LINKLOCAL:
 439                         link_local_start();
 440                         break;
 441 #endif
 442                 default:
 443                         break;
 444                 }
 445
 446                 break;
 447         }
 448
 449 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 450 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 451         defined(CONFIG_STATUS_LED)                      && \
 452         defined(STATUS_LED_RED)
 453         /*
 454          * Echo the inverted link state to the fault LED.
 455          */
 456         if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
 457                 status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
 458         else
 459                 status_led_set(STATUS_LED_RED, STATUS_LED_ON);
 460 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 461 #endif /* CONFIG_MII, ... */
 462 #ifdef CONFIG_USB_KEYBOARD
 463         net_busy_flag = 1;
 464 #endif
 465
 466         /*
 467          *      Main packet reception loop.  Loop receiving packets until
 468          *      someone sets `net_state' to a state that terminates.
 469          */
 470         for (;;) {
 471                 WATCHDOG_RESET();
 472 #ifdef CONFIG_SHOW_ACTIVITY
 473                 show_activity(1);
 474 #endif
 475                 /*
 476                  *      Check the ethernet for a new packet.  The ethernet
 477                  *      receive routine will process it.
 478                  */
 479                 eth_rx();
 480
 481                 /*
 482                  *      Abort if ctrl-c was pressed.
 483                  */
 484                 if (ctrlc()) {
 485                         /* cancel any ARP that may not have completed */
 486                         NetArpWaitPacketIP = 0;
 487
 488                         net_cleanup_loop();
 489                         eth_halt();
 490                         /* Invalidate the last protocol */
 491                         eth_set_last_protocol(BOOTP);
 492
 493                         puts("\nAbort\n");
 494                         /* include a debug print as well incase the debug
 495                            messages are directed to stderr */
 496                         debug_cond(DEBUG_INT_STATE, "--- NetLoop Abort!\n");
 497                         goto done;
 498                 }
 499
 500                 ArpTimeoutCheck();
 501
 502                 /*
 503                  *      Check for a timeout, and run the timeout handler
 504                  *      if we have one.
 505                  */
 506                 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
 507                         thand_f *x;
 508
 509 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 510 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 511         defined(CONFIG_STATUS_LED)                      && \
 512         defined(STATUS_LED_RED)
 513                         /*
 514                          * Echo the inverted link state to the fault LED.
 515                          */
 516                         if (miiphy_link(eth_get_dev()->name,
 517                                        CONFIG_SYS_FAULT_MII_ADDR)) {
 518                                 status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
 519                         } else {
 520                                 status_led_set(STATUS_LED_RED, STATUS_LED_ON);
 521                         }
 522 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 523 #endif /* CONFIG_MII, ... */
 524                         debug_cond(DEBUG_INT_STATE, "--- NetLoop timeout\n");
 525                         x = timeHandler;
 526                         timeHandler = (thand_f *)0;
 527                         (*x)();
 528                 }
 529
 530
 531                 switch (net_state) {
 532
 533                 case NETLOOP_RESTART:
 534                         NetRestarted = 1;
 535                         goto restart;
 536
 537                 case NETLOOP_SUCCESS:
 538                         net_cleanup_loop();
 539                         if (NetBootFileXferSize > 0) {
 540                                 printf("Bytes transferred = %ld (%lx hex)\n",
 541                                         NetBootFileXferSize,
 542                                         NetBootFileXferSize);
 543                                 setenv_hex("filesize", NetBootFileXferSize);
 544                                 setenv_hex("fileaddr", load_addr);
 545                         }
 546                         if (protocol != NETCONS)
 547                                 eth_halt();
 548                         else
 549                                 eth_halt_state_only();
 550
 551                         eth_set_last_protocol(protocol);
 552
 553                         ret = NetBootFileXferSize;
 554                         debug_cond(DEBUG_INT_STATE, "--- NetLoop Success!\n");
 555                         goto done;
 556
 557                 case NETLOOP_FAIL:
 558                         net_cleanup_loop();
 559                         /* Invalidate the last protocol */
 560                         eth_set_last_protocol(BOOTP);
 561                         debug_cond(DEBUG_INT_STATE, "--- NetLoop Fail!\n");
 562                         goto done;
 563
 564                 case NETLOOP_CONTINUE:
 565                         continue;
 566                 }
 567         }
 568
 569 done:
 570 #ifdef CONFIG_USB_KEYBOARD
 571         net_busy_flag = 0;
 572 #endif
 573 #ifdef CONFIG_CMD_TFTPPUT
 574         /* Clear out the handlers */
 575         net_set_udp_handler(NULL);
 576         net_set_icmp_handler(NULL);
 577 #endif
 578         return ret;
 579 }
 580
 581 /**********************************************************************/
 582
 583 static void
 584 startAgainTimeout(void)
 585 {
 586         net_set_state(NETLOOP_RESTART);
 587 }
 588
 589 void NetStartAgain(void)
 590 {
 591         char *nretry;
 592         int retry_forever = 0;
 593         unsigned long retrycnt = 0;
 594
 595         nretry = getenv("netretry");
 596         if (nretry) {
 597                 if (!strcmp(nretry, "yes"))
 598                         retry_forever = 1;
 599                 else if (!strcmp(nretry, "no"))
 600                         retrycnt = 0;
 601                 else if (!strcmp(nretry, "once"))
 602                         retrycnt = 1;
 603                 else
 604                         retrycnt = simple_strtoul(nretry, NULL, 0);
 605         } else
 606                 retry_forever = 1;
 607
 608         if ((!retry_forever) && (NetTryCount >= retrycnt)) {
 609                 eth_halt();
 610                 net_set_state(NETLOOP_FAIL);
 611                 return;
 612         }
 613
 614         NetTryCount++;
 615
 616         eth_halt();
 617 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
 618         eth_try_another(!NetRestarted);
 619 #endif
 620         eth_init(gd->bd);
 621         if (NetRestartWrap) {
 622                 NetRestartWrap = 0;
 623                 if (NetDevExists) {
 624                         NetSetTimeout(10000UL, startAgainTimeout);
 625                         net_set_udp_handler(NULL);
 626                 } else {
 627                         net_set_state(NETLOOP_FAIL);
 628                 }
 629         } else {
 630                 net_set_state(NETLOOP_RESTART);
 631         }
 632 }
 633
 634 /**********************************************************************/
 635 /*
 636  *      Miscelaneous bits.
 637  */
 638
 639 static void dummy_handler(uchar *pkt, unsigned dport,
 640                         IPaddr_t sip, unsigned sport,
 641                         unsigned len)
 642 {
 643 }
 644
 645 rxhand_f *net_get_udp_handler(void)
 646 {
 647         return udp_packet_handler;
 648 }
 649
 650 void net_set_udp_handler(rxhand_f *f)
 651 {
 652         debug_cond(DEBUG_INT_STATE, "--- NetLoop UDP handler set (%p)\n", f);
 653         if (f == NULL)
 654                 udp_packet_handler = dummy_handler;
 655         else
 656                 udp_packet_handler = f;
 657 }
 658
 659 rxhand_f *net_get_arp_handler(void)
 660 {
 661         return arp_packet_handler;
 662 }
 663
 664 void net_set_arp_handler(rxhand_f *f)
 665 {
 666         debug_cond(DEBUG_INT_STATE, "--- NetLoop ARP handler set (%p)\n", f);
 667         if (f == NULL)
 668                 arp_packet_handler = dummy_handler;
 669         else
 670                 arp_packet_handler = f;
 671 }
 672
 673 #ifdef CONFIG_CMD_TFTPPUT
 674 void net_set_icmp_handler(rxhand_icmp_f *f)
 675 {
 676         packet_icmp_handler = f;
 677 }
 678 #endif
 679
 680 void
 681 NetSetTimeout(ulong iv, thand_f *f)
 682 {
 683         if (iv == 0) {
 684                 debug_cond(DEBUG_INT_STATE,
 685                         "--- NetLoop timeout handler cancelled\n");
 686                 timeHandler = (thand_f *)0;
 687         } else {
 688                 debug_cond(DEBUG_INT_STATE,
 689                         "--- NetLoop timeout handler set (%p)\n", f);
 690                 timeHandler = f;
 691                 timeStart = get_timer(0);
 692                 timeDelta = iv * CONFIG_SYS_HZ / 1000;
 693         }
 694 }
 695
 696 int NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport,
 697                 int payload_len)
 698 {
 699         uchar *pkt;
 700         int eth_hdr_size;
 701         int pkt_hdr_size;
 702
 703         /* make sure the NetTxPacket is initialized (NetInit() was called) */
 704         assert(NetTxPacket != NULL);
 705         if (NetTxPacket == NULL)
 706                 return -1;
 707
 708         /* convert to new style broadcast */
 709         if (dest == 0)
 710                 dest = 0xFFFFFFFF;
 711
 712         /* if broadcast, make the ether address a broadcast and don't do ARP */
 713         if (dest == 0xFFFFFFFF)
 714                 ether = NetBcastAddr;
 715
 716         pkt = (uchar *)NetTxPacket;
 717
 718         eth_hdr_size = NetSetEther(pkt, ether, PROT_IP);
 719         pkt += eth_hdr_size;
 720         net_set_udp_header(pkt, dest, dport, sport, payload_len);
 721         pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
 722
 723         /* if MAC address was not discovered yet, do an ARP request */
 724         if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
 725                 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest);
 726
 727                 /* save the ip and eth addr for the packet to send after arp */
 728                 NetArpWaitPacketIP = dest;
 729                 NetArpWaitPacketMAC = ether;
 730
 731                 /* size of the waiting packet */
 732                 NetArpWaitTxPacketSize = pkt_hdr_size + payload_len;
 733
 734                 /* and do the ARP request */
 735                 NetArpWaitTry = 1;
 736                 NetArpWaitTimerStart = get_timer(0);
 737                 ArpRequest();
 738                 return 1;       /* waiting */
 739         } else {
 740                 debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
 741                         &dest, ether);
 742                 NetSendPacket(NetTxPacket, pkt_hdr_size + payload_len);
 743                 return 0;       /* transmitted */
 744         }
 745 }
 746
 747 #ifdef CONFIG_IP_DEFRAG
 748 /*
 749  * This function collects fragments in a single packet, according
 750  * to the algorithm in RFC815. It returns NULL or the pointer to
 751  * a complete packet, in static storage
 752  */
 753 #ifndef CONFIG_NET_MAXDEFRAG
 754 #define CONFIG_NET_MAXDEFRAG 16384
 755 #endif
 756 /*
 757  * MAXDEFRAG, above, is chosen in the config file and  is real data
 758  * so we need to add the NFS overhead, which is more than TFTP.
 759  * To use sizeof in the internal unnamed structures, we need a real
 760  * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately).
 761  * The compiler doesn't complain nor allocates the actual structure
 762  */
 763 static struct rpc_t rpc_specimen;
 764 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply))
 765
 766 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE)
 767
 768 /*
 769  * this is the packet being assembled, either data or frag control.
 770  * Fragments go by 8 bytes, so this union must be 8 bytes long
 771  */
 772 struct hole {
 773         /* first_byte is address of this structure */
 774         u16 last_byte;  /* last byte in this hole + 1 (begin of next hole) */
 775         u16 next_hole;  /* index of next (in 8-b blocks), 0 == none */
 776         u16 prev_hole;  /* index of prev, 0 == none */
 777         u16 unused;
 778 };
 779
 780 static struct ip_udp_hdr *__NetDefragment(struct ip_udp_hdr *ip, int *lenp)
 781 {
 782         static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
 783         static u16 first_hole, total_len;
 784         struct hole *payload, *thisfrag, *h, *newh;
 785         struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff;
 786         uchar *indata = (uchar *)ip;
 787         int offset8, start, len, done = 0;
 788         u16 ip_off = ntohs(ip->ip_off);
 789
 790         /* payload starts after IP header, this fragment is in there */
 791         payload = (struct hole *)(pkt_buff + IP_HDR_SIZE);
 792         offset8 =  (ip_off & IP_OFFS);
 793         thisfrag = payload + offset8;
 794         start = offset8 * 8;
 795         len = ntohs(ip->ip_len) - IP_HDR_SIZE;
 796
 797         if (start + len > IP_MAXUDP) /* fragment extends too far */
 798                 return NULL;
 799
 800         if (!total_len || localip->ip_id != ip->ip_id) {
 801                 /* new (or different) packet, reset structs */
 802                 total_len = 0xffff;
 803                 payload[0].last_byte = ~0;
 804                 payload[0].next_hole = 0;
 805                 payload[0].prev_hole = 0;
 806                 first_hole = 0;
 807                 /* any IP header will work, copy the first we received */
 808                 memcpy(localip, ip, IP_HDR_SIZE);
 809         }
 810
 811         /*
 812          * What follows is the reassembly algorithm. We use the payload
 813          * array as a linked list of hole descriptors, as each hole starts
 814          * at a multiple of 8 bytes. However, last byte can be whatever value,
 815          * so it is represented as byte count, not as 8-byte blocks.
 816          */
 817
 818         h = payload + first_hole;
 819         while (h->last_byte < start) {
 820                 if (!h->next_hole) {
 821                         /* no hole that far away */
 822                         return NULL;
 823                 }
 824                 h = payload + h->next_hole;
 825         }
 826
 827         /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
 828         if (offset8 + ((len + 7) / 8) <= h - payload) {
 829                 /* no overlap with holes (dup fragment?) */
 830                 return NULL;
 831         }
 832
 833         if (!(ip_off & IP_FLAGS_MFRAG)) {
 834                 /* no more fragmentss: truncate this (last) hole */
 835                 total_len = start + len;
 836                 h->last_byte = start + len;
 837         }
 838
 839         /*
 840          * There is some overlap: fix the hole list. This code doesn't
 841          * deal with a fragment that overlaps with two different holes
 842          * (thus being a superset of a previously-received fragment).
 843          */
 844
 845         if ((h >= thisfrag) && (h->last_byte <= start + len)) {
 846                 /* complete overlap with hole: remove hole */
 847                 if (!h->prev_hole && !h->next_hole) {
 848                         /* last remaining hole */
 849                         done = 1;
 850                 } else if (!h->prev_hole) {
 851                         /* first hole */
 852                         first_hole = h->next_hole;
 853                         payload[h->next_hole].prev_hole = 0;
 854                 } else if (!h->next_hole) {
 855                         /* last hole */
 856                         payload[h->prev_hole].next_hole = 0;
 857                 } else {
 858                         /* in the middle of the list */
 859                         payload[h->next_hole].prev_hole = h->prev_hole;
 860                         payload[h->prev_hole].next_hole = h->next_hole;
 861                 }
 862
 863         } else if (h->last_byte <= start + len) {
 864                 /* overlaps with final part of the hole: shorten this hole */
 865                 h->last_byte = start;
 866
 867         } else if (h >= thisfrag) {
 868                 /* overlaps with initial part of the hole: move this hole */
 869                 newh = thisfrag + (len / 8);
 870                 *newh = *h;
 871                 h = newh;
 872                 if (h->next_hole)
 873                         payload[h->next_hole].prev_hole = (h - payload);
 874                 if (h->prev_hole)
 875                         payload[h->prev_hole].next_hole = (h - payload);
 876                 else
 877                         first_hole = (h - payload);
 878
 879         } else {
 880                 /* fragment sits in the middle: split the hole */
 881                 newh = thisfrag + (len / 8);
 882                 *newh = *h;
 883                 h->last_byte = start;
 884                 h->next_hole = (newh - payload);
 885                 newh->prev_hole = (h - payload);
 886                 if (newh->next_hole)
 887                         payload[newh->next_hole].prev_hole = (newh - payload);
 888         }
 889
 890         /* finally copy this fragment and possibly return whole packet */
 891         memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len);
 892         if (!done)
 893                 return NULL;
 894
 895         localip->ip_len = htons(total_len);
 896         *lenp = total_len + IP_HDR_SIZE;
 897         return localip;
 898 }
 899
 900 static inline struct ip_udp_hdr *NetDefragment(struct ip_udp_hdr *ip, int *lenp)
 901 {
 902         u16 ip_off = ntohs(ip->ip_off);
 903         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
 904                 return ip; /* not a fragment */
 905         return __NetDefragment(ip, lenp);
 906 }
 907
 908 #else /* !CONFIG_IP_DEFRAG */
 909
 910 static inline struct ip_udp_hdr *NetDefragment(struct ip_udp_hdr *ip, int *lenp)
 911 {
 912         u16 ip_off = ntohs(ip->ip_off);
 913         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
 914                 return ip; /* not a fragment */
 915         return NULL;
 916 }
 917 #endif
 918
 919 /**
 920  * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
 921  * drop others.
 922  *
 923  * @parma ip    IP packet containing the ICMP
 924  */
 925 static void receive_icmp(struct ip_udp_hdr *ip, int len,
 926                         IPaddr_t src_ip, struct ethernet_hdr *et)
 927 {
 928         struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
 929
 930         switch (icmph->type) {
 931         case ICMP_REDIRECT:
 932                 if (icmph->code != ICMP_REDIR_HOST)
 933                         return;
 934                 printf(" ICMP Host Redirect to %pI4 ",
 935                         &icmph->un.gateway);
 936                 break;
 937         default:
 938 #if defined(CONFIG_CMD_PING)
 939                 ping_receive(et, ip, len);
 940 #endif
 941 #ifdef CONFIG_CMD_TFTPPUT
 942                 if (packet_icmp_handler)
 943                         packet_icmp_handler(icmph->type, icmph->code,
 944                                 ntohs(ip->udp_dst), src_ip, ntohs(ip->udp_src),
 945                                 icmph->un.data, ntohs(ip->udp_len));
 946 #endif
 947                 break;
 948         }
 949 }
 950
 951 void
 952 NetReceive(uchar *inpkt, int len)
 953 {
 954         struct ethernet_hdr *et;
 955         struct ip_udp_hdr *ip;
 956         IPaddr_t dst_ip;
 957         IPaddr_t src_ip;
 958         int eth_proto;
 959 #if defined(CONFIG_CMD_CDP)
 960         int iscdp;
 961 #endif
 962         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
 963
 964         debug_cond(DEBUG_NET_PKT, "packet received\n");
 965
 966         NetRxPacket = inpkt;
 967         NetRxPacketLen = len;
 968         et = (struct ethernet_hdr *)inpkt;
 969
 970         /* too small packet? */
 971         if (len < ETHER_HDR_SIZE)
 972                 return;
 973
 974 #ifdef CONFIG_API
 975         if (push_packet) {
 976                 (*push_packet)(inpkt, len);
 977                 return;
 978         }
 979 #endif
 980
 981 #if defined(CONFIG_CMD_CDP)
 982         /* keep track if packet is CDP */
 983         iscdp = is_cdp_packet(et->et_dest);
 984 #endif
 985
 986         myvlanid = ntohs(NetOurVLAN);
 987         if (myvlanid == (ushort)-1)
 988                 myvlanid = VLAN_NONE;
 989         mynvlanid = ntohs(NetOurNativeVLAN);
 990         if (mynvlanid == (ushort)-1)
 991                 mynvlanid = VLAN_NONE;
 992
 993         eth_proto = ntohs(et->et_protlen);
 994
 995         if (eth_proto < 1514) {
 996                 struct e802_hdr *et802 = (struct e802_hdr *)et;
 997                 /*
 998                  *      Got a 802.2 packet.  Check the other protocol field.
 999                  *      XXX VLAN over 802.2+SNAP not implemented!
1000                  */
1001                 eth_proto = ntohs(et802->et_prot);
1002
1003                 ip = (struct ip_udp_hdr *)(inpkt + E802_HDR_SIZE);
1004                 len -= E802_HDR_SIZE;
1005
1006         } else if (eth_proto != PROT_VLAN) {    /* normal packet */
1007                 ip = (struct ip_udp_hdr *)(inpkt + ETHER_HDR_SIZE);
1008                 len -= ETHER_HDR_SIZE;
1009
1010         } else {                        /* VLAN packet */
1011                 struct vlan_ethernet_hdr *vet =
1012                         (struct vlan_ethernet_hdr *)et;
1013
1014                 debug_cond(DEBUG_NET_PKT, "VLAN packet received\n");
1015
1016                 /* too small packet? */
1017                 if (len < VLAN_ETHER_HDR_SIZE)
1018                         return;
1019
1020                 /* if no VLAN active */
1021                 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
1022 #if defined(CONFIG_CMD_CDP)
1023                                 && iscdp == 0
1024 #endif
1025                                 )
1026                         return;
1027
1028                 cti = ntohs(vet->vet_tag);
1029                 vlanid = cti & VLAN_IDMASK;
1030                 eth_proto = ntohs(vet->vet_type);
1031
1032                 ip = (struct ip_udp_hdr *)(inpkt + VLAN_ETHER_HDR_SIZE);
1033                 len -= VLAN_ETHER_HDR_SIZE;
1034         }
1035
1036         debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto);
1037
1038 #if defined(CONFIG_CMD_CDP)
1039         if (iscdp) {
1040                 cdp_receive((uchar *)ip, len);
1041                 return;
1042         }
1043 #endif
1044
1045         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1046                 if (vlanid == VLAN_NONE)
1047                         vlanid = (mynvlanid & VLAN_IDMASK);
1048                 /* not matched? */
1049                 if (vlanid != (myvlanid & VLAN_IDMASK))
1050                         return;
1051         }
1052
1053         switch (eth_proto) {
1054
1055         case PROT_ARP:
1056                 ArpReceive(et, ip, len);
1057                 break;
1058
1059 #ifdef CONFIG_CMD_RARP
1060         case PROT_RARP:
1061                 rarp_receive(ip, len);
1062                 break;
1063 #endif
1064         case PROT_IP:
1065                 debug_cond(DEBUG_NET_PKT, "Got IP\n");
1066                 /* Before we start poking the header, make sure it is there */
1067                 if (len < IP_UDP_HDR_SIZE) {
1068                         debug("len bad %d < %lu\n", len,
1069                                 (ulong)IP_UDP_HDR_SIZE);
1070                         return;
1071                 }
1072                 /* Check the packet length */
1073                 if (len < ntohs(ip->ip_len)) {
1074                         debug("len bad %d < %d\n", len, ntohs(ip->ip_len));
1075                         return;
1076                 }
1077                 len = ntohs(ip->ip_len);
1078                 debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n",
1079                         len, ip->ip_hl_v & 0xff);
1080
1081                 /* Can't deal with anything except IPv4 */
1082                 if ((ip->ip_hl_v & 0xf0) != 0x40)
1083                         return;
1084                 /* Can't deal with IP options (headers != 20 bytes) */
1085                 if ((ip->ip_hl_v & 0x0f) > 0x05)
1086                         return;
1087                 /* Check the Checksum of the header */
1088                 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE / 2)) {
1089                         debug("checksum bad\n");
1090                         return;
1091                 }
1092                 /* If it is not for us, ignore it */
1093                 dst_ip = NetReadIP(&ip->ip_dst);
1094                 if (NetOurIP && dst_ip != NetOurIP && dst_ip != 0xFFFFFFFF) {
1095 #ifdef CONFIG_MCAST_TFTP
1096                         if (Mcast_addr != dst_ip)
1097 #endif
1098                                 return;
1099                 }
1100                 /* Read source IP address for later use */
1101                 src_ip = NetReadIP(&ip->ip_src);
1102                 /*
1103                  * The function returns the unchanged packet if it's not
1104                  * a fragment, and either the complete packet or NULL if
1105                  * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1106                  */
1107                 ip = NetDefragment(ip, &len);
1108                 if (!ip)
1109                         return;
1110                 /*
1111                  * watch for ICMP host redirects
1112                  *
1113                  * There is no real handler code (yet). We just watch
1114                  * for ICMP host redirect messages. In case anybody
1115                  * sees these messages: please contact me
1116                  * (wd@denx.de), or - even better - send me the
1117                  * necessary fixes :-)
1118                  *
1119                  * Note: in all cases where I have seen this so far
1120                  * it was a problem with the router configuration,
1121                  * for instance when a router was configured in the
1122                  * BOOTP reply, but the TFTP server was on the same
1123                  * subnet. So this is probably a warning that your
1124                  * configuration might be wrong. But I'm not really
1125                  * sure if there aren't any other situations.
1126                  *
1127                  * Simon Glass <sjg@chromium.org>: We get an ICMP when
1128                  * we send a tftp packet to a dead connection, or when
1129                  * there is no server at the other end.
1130                  */
1131                 if (ip->ip_p == IPPROTO_ICMP) {
1132                         receive_icmp(ip, len, src_ip, et);
1133                         return;
1134                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1135                         return;
1136                 }
1137
1138                 debug_cond(DEBUG_DEV_PKT,
1139                         "received UDP (to=%pI4, from=%pI4, len=%d)\n",
1140                         &dst_ip, &src_ip, len);
1141
1142 #ifdef CONFIG_UDP_CHECKSUM
1143                 if (ip->udp_xsum != 0) {
1144                         ulong   xsum;
1145                         ushort *sumptr;
1146                         ushort  sumlen;
1147
1148                         xsum  = ip->ip_p;
1149                         xsum += (ntohs(ip->udp_len));
1150                         xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
1151                         xsum += (ntohl(ip->ip_src) >>  0) & 0x0000ffff;
1152                         xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
1153                         xsum += (ntohl(ip->ip_dst) >>  0) & 0x0000ffff;
1154
1155                         sumlen = ntohs(ip->udp_len);
1156                         sumptr = (ushort *) &(ip->udp_src);
1157
1158                         while (sumlen > 1) {
1159                                 ushort sumdata;
1160
1161                                 sumdata = *sumptr++;
1162                                 xsum += ntohs(sumdata);
1163                                 sumlen -= 2;
1164                         }
1165                         if (sumlen > 0) {
1166                                 ushort sumdata;
1167
1168                                 sumdata = *(unsigned char *) sumptr;
1169                                 sumdata = (sumdata << 8) & 0xff00;
1170                                 xsum += sumdata;
1171                         }
1172                         while ((xsum >> 16) != 0) {
1173                                 xsum = (xsum & 0x0000ffff) +
1174                                        ((xsum >> 16) & 0x0000ffff);
1175                         }
1176                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1177                                 printf(" UDP wrong checksum %08lx %08x\n",
1178                                         xsum, ntohs(ip->udp_xsum));
1179                                 return;
1180                         }
1181                 }
1182 #endif
1183
1184
1185 #ifdef CONFIG_NETCONSOLE
1186                 nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
1187                                         src_ip,
1188                                         ntohs(ip->udp_dst),
1189                                         ntohs(ip->udp_src),
1190                                         ntohs(ip->udp_len) - UDP_HDR_SIZE);
1191 #endif
1192                 /*
1193                  *      IP header OK.  Pass the packet to the current handler.
1194                  */
1195                 (*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE,
1196                                 ntohs(ip->udp_dst),
1197                                 src_ip,
1198                                 ntohs(ip->udp_src),
1199                                 ntohs(ip->udp_len) - UDP_HDR_SIZE);
1200                 break;
1201         }
1202 }
1203
1204
1205 /**********************************************************************/
1206
1207 static int net_check_prereq(enum proto_t protocol)
1208 {
1209         switch (protocol) {
1210                 /* Fall through */
1211 #if defined(CONFIG_CMD_PING)
1212         case PING:
1213                 if (NetPingIP == 0) {
1214                         puts("*** ERROR: ping address not given\n");
1215                         return 1;
1216                 }
1217                 goto common;
1218 #endif
1219 #if defined(CONFIG_CMD_SNTP)
1220         case SNTP:
1221                 if (NetNtpServerIP == 0) {
1222                         puts("*** ERROR: NTP server address not given\n");
1223                         return 1;
1224                 }
1225                 goto common;
1226 #endif
1227 #if defined(CONFIG_CMD_DNS)
1228         case DNS:
1229                 if (NetOurDNSIP == 0) {
1230                         puts("*** ERROR: DNS server address not given\n");
1231                         return 1;
1232                 }
1233                 goto common;
1234 #endif
1235 #if defined(CONFIG_CMD_NFS)
1236         case NFS:
1237 #endif
1238         case TFTPGET:
1239         case TFTPPUT:
1240                 if (NetServerIP == 0) {
1241                         puts("*** ERROR: `serverip' not set\n");
1242                         return 1;
1243                 }
1244 #if     defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
1245         defined(CONFIG_CMD_DNS)
1246 common:
1247 #endif
1248                 /* Fall through */
1249
1250         case NETCONS:
1251         case TFTPSRV:
1252                 if (NetOurIP == 0) {
1253                         puts("*** ERROR: `ipaddr' not set\n");
1254                         return 1;
1255                 }
1256                 /* Fall through */
1257
1258 #ifdef CONFIG_CMD_RARP
1259         case RARP:
1260 #endif
1261         case BOOTP:
1262         case CDP:
1263         case DHCP:
1264         case LINKLOCAL:
1265                 if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
1266                         int num = eth_get_dev_index();
1267
1268                         switch (num) {
1269                         case -1:
1270                                 puts("*** ERROR: No ethernet found.\n");
1271                                 return 1;
1272                         case 0:
1273                                 puts("*** ERROR: `ethaddr' not set\n");
1274                                 break;
1275                         default:
1276                                 printf("*** ERROR: `eth%daddr' not set\n",
1277                                         num);
1278                                 break;
1279                         }
1280
1281                         NetStartAgain();
1282                         return 2;
1283                 }
1284                 /* Fall through */
1285         default:
1286                 return 0;
1287         }
1288         return 0;               /* OK */
1289 }
1290 /**********************************************************************/
1291
1292 int
1293 NetCksumOk(uchar *ptr, int len)
1294 {
1295         return !((NetCksum(ptr, len) + 1) & 0xfffe);
1296 }
1297
1298
1299 unsigned
1300 NetCksum(uchar *ptr, int len)
1301 {
1302         ulong   xsum;
1303         ushort *p = (ushort *)ptr;
1304
1305         xsum = 0;
1306         while (len-- > 0)
1307                 xsum += *p++;
1308         xsum = (xsum & 0xffff) + (xsum >> 16);
1309         xsum = (xsum & 0xffff) + (xsum >> 16);
1310         return xsum & 0xffff;
1311 }
1312
1313 int
1314 NetEthHdrSize(void)
1315 {
1316         ushort myvlanid;
1317
1318         myvlanid = ntohs(NetOurVLAN);
1319         if (myvlanid == (ushort)-1)
1320                 myvlanid = VLAN_NONE;
1321
1322         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1323                 VLAN_ETHER_HDR_SIZE;
1324 }
1325
1326 int
1327 NetSetEther(uchar *xet, uchar * addr, uint prot)
1328 {
1329         struct ethernet_hdr *et = (struct ethernet_hdr *)xet;
1330         ushort myvlanid;
1331
1332         myvlanid = ntohs(NetOurVLAN);
1333         if (myvlanid == (ushort)-1)
1334                 myvlanid = VLAN_NONE;
1335
1336         memcpy(et->et_dest, addr, 6);
1337         memcpy(et->et_src, NetOurEther, 6);
1338         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1339                 et->et_protlen = htons(prot);
1340                 return ETHER_HDR_SIZE;
1341         } else {
1342                 struct vlan_ethernet_hdr *vet =
1343                         (struct vlan_ethernet_hdr *)xet;
1344
1345                 vet->vet_vlan_type = htons(PROT_VLAN);
1346                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1347                 vet->vet_type = htons(prot);
1348                 return VLAN_ETHER_HDR_SIZE;
1349         }
1350 }
1351
1352 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
1353 {
1354         ushort protlen;
1355
1356         memcpy(et->et_dest, addr, 6);
1357         memcpy(et->et_src, NetOurEther, 6);
1358         protlen = ntohs(et->et_protlen);
1359         if (protlen == PROT_VLAN) {
1360                 struct vlan_ethernet_hdr *vet =
1361                         (struct vlan_ethernet_hdr *)et;
1362                 vet->vet_type = htons(prot);
1363                 return VLAN_ETHER_HDR_SIZE;
1364         } else if (protlen > 1514) {
1365                 et->et_protlen = htons(prot);
1366                 return ETHER_HDR_SIZE;
1367         } else {
1368                 /* 802.2 + SNAP */
1369                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1370                 et802->et_prot = htons(prot);
1371                 return E802_HDR_SIZE;
1372         }
1373 }
1374
1375 void net_set_ip_header(uchar *pkt, IPaddr_t dest, IPaddr_t source)
1376 {
1377         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1378
1379         /*
1380          *      Construct an IP header.
1381          */
1382         /* IP_HDR_SIZE / 4 (not including UDP) */
1383         ip->ip_hl_v  = 0x45;
1384         ip->ip_tos   = 0;
1385         ip->ip_len   = htons(IP_HDR_SIZE);
1386         ip->ip_id    = htons(NetIPID++);
1387         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1388         ip->ip_ttl   = 255;
1389         ip->ip_sum   = 0;
1390         /* already in network byte order */
1391         NetCopyIP((void *)&ip->ip_src, &source);
1392         /* already in network byte order */
1393         NetCopyIP((void *)&ip->ip_dst, &dest);
1394 }
1395
1396 void net_set_udp_header(uchar *pkt, IPaddr_t dest, int dport, int sport,
1397                         int len)
1398 {
1399         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1400
1401         /*
1402          *      If the data is an odd number of bytes, zero the
1403          *      byte after the last byte so that the checksum
1404          *      will work.
1405          */
1406         if (len & 1)
1407                 pkt[IP_UDP_HDR_SIZE + len] = 0;
1408
1409         net_set_ip_header(pkt, dest, NetOurIP);
1410         ip->ip_len   = htons(IP_UDP_HDR_SIZE + len);
1411         ip->ip_p     = IPPROTO_UDP;
1412         ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE >> 1);
1413
1414         ip->udp_src  = htons(sport);
1415         ip->udp_dst  = htons(dport);
1416         ip->udp_len  = htons(UDP_HDR_SIZE + len);
1417         ip->udp_xsum = 0;
1418 }
1419
1420 void copy_filename(char *dst, const char *src, int size)
1421 {
1422         if (*src && (*src == '"')) {
1423                 ++src;
1424                 --size;
1425         }
1426
1427         while ((--size > 0) && *src && (*src != '"'))
1428                 *dst++ = *src++;
1429         *dst = '\0';
1430 }
1431
1432 #if     defined(CONFIG_CMD_NFS)         || \
1433         defined(CONFIG_CMD_SNTP)        || \
1434         defined(CONFIG_CMD_DNS)
1435 /*
1436  * make port a little random (1024-17407)
1437  * This keeps the math somewhat trivial to compute, and seems to work with
1438  * all supported protocols/clients/servers
1439  */
1440 unsigned int random_port(void)
1441 {
1442         return 1024 + (get_timer(0) % 0x4000);
1443 }
1444 #endif
1445
1446 void ip_to_string(IPaddr_t x, char *s)
1447 {
1448         x = ntohl(x);
1449         sprintf(s, "%d.%d.%d.%d",
1450                 (int) ((x >> 24) & 0xff),
1451                 (int) ((x >> 16) & 0xff),
1452                 (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
1453         );
1454 }
1455
1456 void VLAN_to_string(ushort x, char *s)
1457 {
1458         x = ntohs(x);
1459
1460         if (x == (ushort)-1)
1461                 x = VLAN_NONE;
1462
1463         if (x == VLAN_NONE)
1464                 strcpy(s, "none");
1465         else
1466                 sprintf(s, "%d", x & VLAN_IDMASK);
1467 }
1468
1469 ushort string_to_VLAN(const char *s)
1470 {
1471         ushort id;
1472
1473         if (s == NULL)
1474                 return htons(VLAN_NONE);
1475
1476         if (*s < '0' || *s > '9')
1477                 id = VLAN_NONE;
1478         else
1479                 id = (ushort)simple_strtoul(s, NULL, 10);
1480
1481         return htons(id);
1482 }
1483
1484 ushort getenv_VLAN(char *var)
1485 {
1486         return string_to_VLAN(getenv(var));
1487 }