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, [email protected]
   9  *      SPDX-License-Identifier:        GPL-2.0
  10  */
  11
  12 /*
  13  * General Desription:
  14  *
  15  * The user interface supports commands for BOOTP, RARP, and TFTP.
  16  * Also, we support ARP internally. Depending on available data,
  17  * these interact as follows:
  18  *
  19  * BOOTP:
  20  *
  21  *      Prerequisites:  - own ethernet address
  22  *      We want:        - own IP address
  23  *                      - TFTP server IP address
  24  *                      - name of bootfile
  25  *      Next step:      ARP
  26  *
  27  * LINK_LOCAL:
  28  *
  29  *      Prerequisites:  - own ethernet address
  30  *      We want:        - own IP address
  31  *      Next step:      ARP
  32  *
  33  * RARP:
  34  *
  35  *      Prerequisites:  - own ethernet address
  36  *      We want:        - own IP address
  37  *                      - TFTP server IP address
  38  *      Next step:      ARP
  39  *
  40  * ARP:
  41  *
  42  *      Prerequisites:  - own ethernet address
  43  *                      - own IP address
  44  *                      - TFTP server IP address
  45  *      We want:        - TFTP server ethernet address
  46  *      Next step:      TFTP
  47  *
  48  * DHCP:
  49  *
  50  *     Prerequisites:   - own ethernet address
  51  *     We want:         - IP, Netmask, ServerIP, Gateway IP
  52  *                      - bootfilename, lease time
  53  *     Next step:       - TFTP
  54  *
  55  * TFTP:
  56  *
  57  *      Prerequisites:  - own ethernet address
  58  *                      - own IP address
  59  *                      - TFTP server IP address
  60  *                      - TFTP server ethernet address
  61  *                      - name of bootfile (if unknown, we use a default name
  62  *                        derived from our own IP address)
  63  *      We want:        - load the boot file
  64  *      Next step:      none
  65  *
  66  * NFS:
  67  *
  68  *      Prerequisites:  - own ethernet address
  69  *                      - own IP address
  70  *                      - name of bootfile (if unknown, we use a default name
  71  *                        derived from our own IP address)
  72  *      We want:        - load the boot file
  73  *      Next step:      none
  74  *
  75  * SNTP:
  76  *
  77  *      Prerequisites:  - own ethernet address
  78  *                      - own IP address
  79  *      We want:        - network time
  80  *      Next step:      none
  81  */
  82
  83
  84 #include <common.h>
  85 #include <command.h>
  86 #include <environment.h>
  87 #include <errno.h>
  88 #include <net.h>
  89 #if defined(CONFIG_STATUS_LED)
  90 #include <miiphy.h>
  91 #include <status_led.h>
  92 #endif
  93 #include <watchdog.h>
  94 #include <linux/compiler.h>
  95 #include "arp.h"
  96 #include "bootp.h"
  97 #include "cdp.h"
  98 #if defined(CONFIG_CMD_DNS)
  99 #include "dns.h"
 100 #endif
 101 #include "link_local.h"
 102 #include "nfs.h"
 103 #include "ping.h"
 104 #include "rarp.h"
 105 #if defined(CONFIG_CMD_SNTP)
 106 #include "sntp.h"
 107 #endif
 108 #include "tftp.h"
 109
 110 DECLARE_GLOBAL_DATA_PTR;
 111
 112 /** BOOTP EXTENTIONS **/
 113
 114 /* Our subnet mask (0=unknown) */
 115 struct in_addr net_netmask;
 116 /* Our gateways IP address */
 117 struct in_addr net_gateway;
 118 /* Our DNS IP address */
 119 struct in_addr net_dns_server;
 120 #if defined(CONFIG_BOOTP_DNS2)
 121 /* Our 2nd DNS IP address */
 122 struct in_addr net_dns_server2;
 123 #endif
 124
 125 #ifdef CONFIG_MCAST_TFTP        /* Multicast TFTP */
 126 struct in_addr net_mcast_addr;
 127 #endif
 128
 129 /** END OF BOOTP EXTENTIONS **/
 130
 131 /* Our ethernet address */
 132 u8 net_ethaddr[6];
 133 /* Boot server enet address */
 134 u8 net_server_ethaddr[6];
 135 /* Our IP addr (0 = unknown) */
 136 struct in_addr  net_ip;
 137 /* Server IP addr (0 = unknown) */
 138 struct in_addr  net_server_ip;
 139 /* Current receive packet */
 140 uchar *net_rx_packet;
 141 /* Current rx packet length */
 142 int             net_rx_packet_len;
 143 /* IP packet ID */
 144 static unsigned net_ip_id;
 145 /* Ethernet bcast address */
 146 const u8 net_bcast_ethaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 147 const u8 net_null_ethaddr[6];
 148 #ifdef CONFIG_API
 149 void (*push_packet)(void *, int len) = 0;
 150 #endif
 151 /* Network loop state */
 152 enum net_loop_state net_state;
 153 /* Tried all network devices */
 154 int             net_restart_wrap;
 155 /* Network loop restarted */
 156 static int      net_restarted;
 157 /* At least one device configured */
 158 static int      net_dev_exists;
 159
 160 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
 161 /* default is without VLAN */
 162 ushort          net_our_vlan = 0xFFFF;
 163 /* ditto */
 164 ushort          net_native_vlan = 0xFFFF;
 165
 166 /* Boot File name */
 167 char net_boot_file_name[128];
 168 /* The actual transferred size of the bootfile (in bytes) */
 169 u32 net_boot_file_size;
 170 /* Boot file size in blocks as reported by the DHCP server */
 171 u32 net_boot_file_expected_size_in_blocks;
 172
 173 #if defined(CONFIG_CMD_SNTP)
 174 /* NTP server IP address */
 175 struct in_addr  net_ntp_server;
 176 /* offset time from UTC */
 177 int             net_ntp_time_offset;
 178 #endif
 179
 180 static uchar net_pkt_buf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 181 /* Receive packets */
 182 uchar *net_rx_packets[PKTBUFSRX];
 183 /* Current UDP RX packet handler */
 184 static rxhand_f *udp_packet_handler;
 185 /* Current ARP RX packet handler */
 186 static rxhand_f *arp_packet_handler;
 187 #ifdef CONFIG_CMD_TFTPPUT
 188 /* Current ICMP rx handler */
 189 static rxhand_icmp_f *packet_icmp_handler;
 190 #endif
 191 /* Current timeout handler */
 192 static thand_f *time_handler;
 193 /* Time base value */
 194 static ulong    time_start;
 195 /* Current timeout value */
 196 static ulong    time_delta;
 197 /* THE transmit packet */
 198 uchar *net_tx_packet;
 199
 200 static int net_check_prereq(enum proto_t protocol);
 201
 202 static int net_try_count;
 203
 204 int __maybe_unused net_busy_flag;
 205
 206 /**********************************************************************/
 207
 208 static int on_bootfile(const char *name, const char *value, enum env_op op,
 209         int flags)
 210 {
 211         switch (op) {
 212         case env_op_create:
 213         case env_op_overwrite:
 214                 copy_filename(net_boot_file_name, value,
 215                               sizeof(net_boot_file_name));
 216                 break;
 217         default:
 218                 break;
 219         }
 220
 221         return 0;
 222 }
 223 U_BOOT_ENV_CALLBACK(bootfile, on_bootfile);
 224
 225 /*
 226  * Check if autoload is enabled. If so, use either NFS or TFTP to download
 227  * the boot file.
 228  */
 229 void net_auto_load(void)
 230 {
 231 #if defined(CONFIG_CMD_NFS)
 232         const char *s = getenv("autoload");
 233
 234         if (s != NULL && strcmp(s, "NFS") == 0) {
 235                 /*
 236                  * Use NFS to load the bootfile.
 237                  */
 238                 nfs_start();
 239                 return;
 240         }
 241 #endif
 242         if (getenv_yesno("autoload") == 0) {
 243                 /*
 244                  * Just use BOOTP/RARP to configure system;
 245                  * Do not use TFTP to load the bootfile.
 246                  */
 247                 net_set_state(NETLOOP_SUCCESS);
 248                 return;
 249         }
 250         tftp_start(TFTPGET);
 251 }
 252
 253 static void net_init_loop(void)
 254 {
 255         static int env_changed_id;
 256         int env_id = get_env_id();
 257
 258         /* update only when the environment has changed */
 259         if (env_changed_id != env_id) {
 260                 net_ip = getenv_ip("ipaddr");
 261                 net_gateway = getenv_ip("gatewayip");
 262                 net_netmask = getenv_ip("netmask");
 263                 net_server_ip = getenv_ip("serverip");
 264                 net_native_vlan = getenv_vlan("nvlan");
 265                 net_our_vlan = getenv_vlan("vlan");
 266 #if defined(CONFIG_CMD_DNS)
 267                 net_dns_server = getenv_ip("dnsip");
 268 #endif
 269                 env_changed_id = env_id;
 270         }
 271         if (eth_get_dev())
 272                 memcpy(net_ethaddr, eth_get_ethaddr(), 6);
 273
 274         return;
 275 }
 276
 277 static void net_clear_handlers(void)
 278 {
 279         net_set_udp_handler(NULL);
 280         net_set_arp_handler(NULL);
 281         net_set_timeout_handler(0, NULL);
 282 }
 283
 284 static void net_cleanup_loop(void)
 285 {
 286         net_clear_handlers();
 287 }
 288
 289 void net_init(void)
 290 {
 291         static int first_call = 1;
 292
 293         if (first_call) {
 294                 /*
 295                  *      Setup packet buffers, aligned correctly.
 296                  */
 297                 int i;
 298
 299                 net_tx_packet = &net_pkt_buf[0] + (PKTALIGN - 1);
 300                 net_tx_packet -= (ulong)net_tx_packet % PKTALIGN;
 301                 for (i = 0; i < PKTBUFSRX; i++) {
 302                         net_rx_packets[i] = net_tx_packet +
 303                                 (i + 1) * PKTSIZE_ALIGN;
 304                 }
 305                 arp_init();
 306                 net_clear_handlers();
 307
 308                 /* Only need to setup buffer pointers once. */
 309                 first_call = 0;
 310         }
 311
 312         net_init_loop();
 313 }
 314
 315 /**********************************************************************/
 316 /*
 317  *      Main network processing loop.
 318  */
 319
 320 int net_loop(enum proto_t protocol)
 321 {
 322         int ret = -EINVAL;
 323
 324         net_restarted = 0;
 325         net_dev_exists = 0;
 326         net_try_count = 1;
 327         debug_cond(DEBUG_INT_STATE, "--- net_loop Entry\n");
 328
 329         bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
 330         net_init();
 331         if (eth_is_on_demand_init() || protocol != NETCONS) {
 332                 eth_halt();
 333                 eth_set_current();
 334                 ret = eth_init();
 335                 if (ret < 0) {
 336                         eth_halt();
 337                         return ret;
 338                 }
 339         } else {
 340                 eth_init_state_only();
 341         }
 342 restart:
 343 #ifdef CONFIG_USB_KEYBOARD
 344         net_busy_flag = 0;
 345 #endif
 346         net_set_state(NETLOOP_CONTINUE);
 347
 348         /*
 349          *      Start the ball rolling with the given start function.  From
 350          *      here on, this code is a state machine driven by received
 351          *      packets and timer events.
 352          */
 353         debug_cond(DEBUG_INT_STATE, "--- net_loop Init\n");
 354         net_init_loop();
 355
 356         switch (net_check_prereq(protocol)) {
 357         case 1:
 358                 /* network not configured */
 359                 eth_halt();
 360                 return -ENODEV;
 361
 362         case 2:
 363                 /* network device not configured */
 364                 break;
 365
 366         case 0:
 367                 net_dev_exists = 1;
 368                 net_boot_file_size = 0;
 369                 switch (protocol) {
 370                 case TFTPGET:
 371 #ifdef CONFIG_CMD_TFTPPUT
 372                 case TFTPPUT:
 373 #endif
 374                         /* always use ARP to get server ethernet address */
 375                         tftp_start(protocol);
 376                         break;
 377 #ifdef CONFIG_CMD_TFTPSRV
 378                 case TFTPSRV:
 379                         tftp_start_server();
 380                         break;
 381 #endif
 382 #if defined(CONFIG_CMD_DHCP)
 383                 case DHCP:
 384                         bootp_reset();
 385                         net_ip.s_addr = 0;
 386                         dhcp_request();         /* Basically same as BOOTP */
 387                         break;
 388 #endif
 389
 390                 case BOOTP:
 391                         bootp_reset();
 392                         net_ip.s_addr = 0;
 393                         bootp_request();
 394                         break;
 395
 396 #if defined(CONFIG_CMD_RARP)
 397                 case RARP:
 398                         rarp_try = 0;
 399                         net_ip.s_addr = 0;
 400                         rarp_request();
 401                         break;
 402 #endif
 403 #if defined(CONFIG_CMD_PING)
 404                 case PING:
 405                         ping_start();
 406                         break;
 407 #endif
 408 #if defined(CONFIG_CMD_NFS)
 409                 case NFS:
 410                         nfs_start();
 411                         break;
 412 #endif
 413 #if defined(CONFIG_CMD_CDP)
 414                 case CDP:
 415                         cdp_start();
 416                         break;
 417 #endif
 418 #if defined(CONFIG_NETCONSOLE) && !(CONFIG_SPL_BUILD)
 419                 case NETCONS:
 420                         nc_start();
 421                         break;
 422 #endif
 423 #if defined(CONFIG_CMD_SNTP)
 424                 case SNTP:
 425                         sntp_start();
 426                         break;
 427 #endif
 428 #if defined(CONFIG_CMD_DNS)
 429                 case DNS:
 430                         dns_start();
 431                         break;
 432 #endif
 433 #if defined(CONFIG_CMD_LINK_LOCAL)
 434                 case LINKLOCAL:
 435                         link_local_start();
 436                         break;
 437 #endif
 438                 default:
 439                         break;
 440                 }
 441
 442                 break;
 443         }
 444
 445 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 446 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 447         defined(CONFIG_STATUS_LED)                      && \
 448         defined(STATUS_LED_RED)
 449         /*
 450          * Echo the inverted link state to the fault LED.
 451          */
 452         if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
 453                 status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
 454         else
 455                 status_led_set(STATUS_LED_RED, STATUS_LED_ON);
 456 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 457 #endif /* CONFIG_MII, ... */
 458 #ifdef CONFIG_USB_KEYBOARD
 459         net_busy_flag = 1;
 460 #endif
 461
 462         /*
 463          *      Main packet reception loop.  Loop receiving packets until
 464          *      someone sets `net_state' to a state that terminates.
 465          */
 466         for (;;) {
 467                 WATCHDOG_RESET();
 468 #ifdef CONFIG_SHOW_ACTIVITY
 469                 show_activity(1);
 470 #endif
 471                 /*
 472                  *      Check the ethernet for a new packet.  The ethernet
 473                  *      receive routine will process it.
 474                  *      Most drivers return the most recent packet size, but not
 475                  *      errors that may have happened.
 476                  */
 477                 eth_rx();
 478
 479                 /*
 480                  *      Abort if ctrl-c was pressed.
 481                  */
 482                 if (ctrlc()) {
 483                         /* cancel any ARP that may not have completed */
 484                         net_arp_wait_packet_ip.s_addr = 0;
 485
 486                         net_cleanup_loop();
 487                         eth_halt();
 488                         /* Invalidate the last protocol */
 489                         eth_set_last_protocol(BOOTP);
 490
 491                         puts("\nAbort\n");
 492                         /* include a debug print as well incase the debug
 493                            messages are directed to stderr */
 494                         debug_cond(DEBUG_INT_STATE, "--- net_loop Abort!\n");
 495                         goto done;
 496                 }
 497
 498                 arp_timeout_check();
 499
 500                 /*
 501                  *      Check for a timeout, and run the timeout handler
 502                  *      if we have one.
 503                  */
 504                 if (time_handler &&
 505                     ((get_timer(0) - time_start) > time_delta)) {
 506                         thand_f *x;
 507
 508 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 509 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 510         defined(CONFIG_STATUS_LED)                      && \
 511         defined(STATUS_LED_RED)
 512                         /*
 513                          * Echo the inverted link state to the fault LED.
 514                          */
 515                         if (miiphy_link(eth_get_dev()->name,
 516                                         CONFIG_SYS_FAULT_MII_ADDR))
 517                                 status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
 518                         else
 519                                 status_led_set(STATUS_LED_RED, STATUS_LED_ON);
 520 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 521 #endif /* CONFIG_MII, ... */
 522                         debug_cond(DEBUG_INT_STATE, "--- net_loop timeout\n");
 523                         x = time_handler;
 524                         time_handler = (thand_f *)0;
 525                         (*x)();
 526                 }
 527
 528                 if (net_state == NETLOOP_FAIL)
 529                         ret = net_start_again();
 530
 531                 switch (net_state) {
 532                 case NETLOOP_RESTART:
 533                         net_restarted = 1;
 534                         goto restart;
 535
 536                 case NETLOOP_SUCCESS:
 537                         net_cleanup_loop();
 538                         if (net_boot_file_size > 0) {
 539                                 printf("Bytes transferred = %d (%x hex)\n",
 540                                        net_boot_file_size, net_boot_file_size);
 541                                 setenv_hex("filesize", net_boot_file_size);
 542                                 setenv_hex("fileaddr", load_addr);
 543                         }
 544                         if (protocol != NETCONS)
 545                                 eth_halt();
 546                         else
 547                                 eth_halt_state_only();
 548
 549                         eth_set_last_protocol(protocol);
 550
 551                         ret = net_boot_file_size;
 552                         debug_cond(DEBUG_INT_STATE, "--- net_loop Success!\n");
 553                         goto done;
 554
 555                 case NETLOOP_FAIL:
 556                         net_cleanup_loop();
 557                         /* Invalidate the last protocol */
 558                         eth_set_last_protocol(BOOTP);
 559                         debug_cond(DEBUG_INT_STATE, "--- net_loop Fail!\n");
 560                         goto done;
 561
 562                 case NETLOOP_CONTINUE:
 563                         continue;
 564                 }
 565         }
 566
 567 done:
 568 #ifdef CONFIG_USB_KEYBOARD
 569         net_busy_flag = 0;
 570 #endif
 571 #ifdef CONFIG_CMD_TFTPPUT
 572         /* Clear out the handlers */
 573         net_set_udp_handler(NULL);
 574         net_set_icmp_handler(NULL);
 575 #endif
 576         return ret;
 577 }
 578
 579 /**********************************************************************/
 580
 581 static void start_again_timeout_handler(void)
 582 {
 583         net_set_state(NETLOOP_RESTART);
 584 }
 585
 586 int net_start_again(void)
 587 {
 588         char *nretry;
 589         int retry_forever = 0;
 590         unsigned long retrycnt = 0;
 591         int ret;
 592
 593         nretry = getenv("netretry");
 594         if (nretry) {
 595                 if (!strcmp(nretry, "yes"))
 596                         retry_forever = 1;
 597                 else if (!strcmp(nretry, "no"))
 598                         retrycnt = 0;
 599                 else if (!strcmp(nretry, "once"))
 600                         retrycnt = 1;
 601                 else
 602                         retrycnt = simple_strtoul(nretry, NULL, 0);
 603         } else {
 604                 retrycnt = 0;
 605                 retry_forever = 0;
 606         }
 607
 608         if ((!retry_forever) && (net_try_count >= retrycnt)) {
 609                 eth_halt();
 610                 net_set_state(NETLOOP_FAIL);
 611                 /*
 612                  * We don't provide a way for the protocol to return an error,
 613                  * but this is almost always the reason.
 614                  */
 615                 return -ETIMEDOUT;
 616         }
 617
 618         net_try_count++;
 619
 620         eth_halt();
 621 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
 622         eth_try_another(!net_restarted);
 623 #endif
 624         ret = eth_init();
 625         if (net_restart_wrap) {
 626                 net_restart_wrap = 0;
 627                 if (net_dev_exists) {
 628                         net_set_timeout_handler(10000UL,
 629                                                 start_again_timeout_handler);
 630                         net_set_udp_handler(NULL);
 631                 } else {
 632                         net_set_state(NETLOOP_FAIL);
 633                 }
 634         } else {
 635                 net_set_state(NETLOOP_RESTART);
 636         }
 637         return ret;
 638 }
 639
 640 /**********************************************************************/
 641 /*
 642  *      Miscelaneous bits.
 643  */
 644
 645 static void dummy_handler(uchar *pkt, unsigned dport,
 646                         struct in_addr sip, unsigned sport,
 647                         unsigned len)
 648 {
 649 }
 650
 651 rxhand_f *net_get_udp_handler(void)
 652 {
 653         return udp_packet_handler;
 654 }
 655
 656 void net_set_udp_handler(rxhand_f *f)
 657 {
 658         debug_cond(DEBUG_INT_STATE, "--- net_loop UDP handler set (%p)\n", f);
 659         if (f == NULL)
 660                 udp_packet_handler = dummy_handler;
 661         else
 662                 udp_packet_handler = f;
 663 }
 664
 665 rxhand_f *net_get_arp_handler(void)
 666 {
 667         return arp_packet_handler;
 668 }
 669
 670 void net_set_arp_handler(rxhand_f *f)
 671 {
 672         debug_cond(DEBUG_INT_STATE, "--- net_loop ARP handler set (%p)\n", f);
 673         if (f == NULL)
 674                 arp_packet_handler = dummy_handler;
 675         else
 676                 arp_packet_handler = f;
 677 }
 678
 679 #ifdef CONFIG_CMD_TFTPPUT
 680 void net_set_icmp_handler(rxhand_icmp_f *f)
 681 {
 682         packet_icmp_handler = f;
 683 }
 684 #endif
 685
 686 void net_set_timeout_handler(ulong iv, thand_f *f)
 687 {
 688         if (iv == 0) {
 689                 debug_cond(DEBUG_INT_STATE,
 690                            "--- net_loop timeout handler cancelled\n");
 691                 time_handler = (thand_f *)0;
 692         } else {
 693                 debug_cond(DEBUG_INT_STATE,
 694                            "--- net_loop timeout handler set (%p)\n", f);
 695                 time_handler = f;
 696                 time_start = get_timer(0);
 697                 time_delta = iv * CONFIG_SYS_HZ / 1000;
 698         }
 699 }
 700
 701 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
 702                 int payload_len)
 703 {
 704         uchar *pkt;
 705         int eth_hdr_size;
 706         int pkt_hdr_size;
 707
 708         /* make sure the net_tx_packet is initialized (net_init() was called) */
 709         assert(net_tx_packet != NULL);
 710         if (net_tx_packet == NULL)
 711                 return -1;
 712
 713         /* convert to new style broadcast */
 714         if (dest.s_addr == 0)
 715                 dest.s_addr = 0xFFFFFFFF;
 716
 717         /* if broadcast, make the ether address a broadcast and don't do ARP */
 718         if (dest.s_addr == 0xFFFFFFFF)
 719                 ether = (uchar *)net_bcast_ethaddr;
 720
 721         pkt = (uchar *)net_tx_packet;
 722
 723         eth_hdr_size = net_set_ether(pkt, ether, PROT_IP);
 724         pkt += eth_hdr_size;
 725         net_set_udp_header(pkt, dest, dport, sport, payload_len);
 726         pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
 727
 728         /* if MAC address was not discovered yet, do an ARP request */
 729         if (memcmp(ether, net_null_ethaddr, 6) == 0) {
 730                 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest);
 731
 732                 /* save the ip and eth addr for the packet to send after arp */
 733                 net_arp_wait_packet_ip = dest;
 734                 arp_wait_packet_ethaddr = ether;
 735
 736                 /* size of the waiting packet */
 737                 arp_wait_tx_packet_size = pkt_hdr_size + payload_len;
 738
 739                 /* and do the ARP request */
 740                 arp_wait_try = 1;
 741                 arp_wait_timer_start = get_timer(0);
 742                 arp_request();
 743                 return 1;       /* waiting */
 744         } else {
 745                 debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
 746                            &dest, ether);
 747                 net_send_packet(net_tx_packet, pkt_hdr_size + payload_len);
 748                 return 0;       /* transmitted */
 749         }
 750 }
 751
 752 #ifdef CONFIG_IP_DEFRAG
 753 /*
 754  * This function collects fragments in a single packet, according
 755  * to the algorithm in RFC815. It returns NULL or the pointer to
 756  * a complete packet, in static storage
 757  */
 758 #ifndef CONFIG_NET_MAXDEFRAG
 759 #define CONFIG_NET_MAXDEFRAG 16384
 760 #endif
 761 /*
 762  * MAXDEFRAG, above, is chosen in the config file and  is real data
 763  * so we need to add the NFS overhead, which is more than TFTP.
 764  * To use sizeof in the internal unnamed structures, we need a real
 765  * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately).
 766  * The compiler doesn't complain nor allocates the actual structure
 767  */
 768 static struct rpc_t rpc_specimen;
 769 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply))
 770
 771 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE)
 772
 773 /*
 774  * this is the packet being assembled, either data or frag control.
 775  * Fragments go by 8 bytes, so this union must be 8 bytes long
 776  */
 777 struct hole {
 778         /* first_byte is address of this structure */
 779         u16 last_byte;  /* last byte in this hole + 1 (begin of next hole) */
 780         u16 next_hole;  /* index of next (in 8-b blocks), 0 == none */
 781         u16 prev_hole;  /* index of prev, 0 == none */
 782         u16 unused;
 783 };
 784
 785 static struct ip_udp_hdr *__net_defragment(struct ip_udp_hdr *ip, int *lenp)
 786 {
 787         static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
 788         static u16 first_hole, total_len;
 789         struct hole *payload, *thisfrag, *h, *newh;
 790         struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff;
 791         uchar *indata = (uchar *)ip;
 792         int offset8, start, len, done = 0;
 793         u16 ip_off = ntohs(ip->ip_off);
 794
 795         /* payload starts after IP header, this fragment is in there */
 796         payload = (struct hole *)(pkt_buff + IP_HDR_SIZE);
 797         offset8 =  (ip_off & IP_OFFS);
 798         thisfrag = payload + offset8;
 799         start = offset8 * 8;
 800         len = ntohs(ip->ip_len) - IP_HDR_SIZE;
 801
 802         if (start + len > IP_MAXUDP) /* fragment extends too far */
 803                 return NULL;
 804
 805         if (!total_len || localip->ip_id != ip->ip_id) {
 806                 /* new (or different) packet, reset structs */
 807                 total_len = 0xffff;
 808                 payload[0].last_byte = ~0;
 809                 payload[0].next_hole = 0;
 810                 payload[0].prev_hole = 0;
 811                 first_hole = 0;
 812                 /* any IP header will work, copy the first we received */
 813                 memcpy(localip, ip, IP_HDR_SIZE);
 814         }
 815
 816         /*
 817          * What follows is the reassembly algorithm. We use the payload
 818          * array as a linked list of hole descriptors, as each hole starts
 819          * at a multiple of 8 bytes. However, last byte can be whatever value,
 820          * so it is represented as byte count, not as 8-byte blocks.
 821          */
 822
 823         h = payload + first_hole;
 824         while (h->last_byte < start) {
 825                 if (!h->next_hole) {
 826                         /* no hole that far away */
 827                         return NULL;
 828                 }
 829                 h = payload + h->next_hole;
 830         }
 831
 832         /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
 833         if (offset8 + ((len + 7) / 8) <= h - payload) {
 834                 /* no overlap with holes (dup fragment?) */
 835                 return NULL;
 836         }
 837
 838         if (!(ip_off & IP_FLAGS_MFRAG)) {
 839                 /* no more fragmentss: truncate this (last) hole */
 840                 total_len = start + len;
 841                 h->last_byte = start + len;
 842         }
 843
 844         /*
 845          * There is some overlap: fix the hole list. This code doesn't
 846          * deal with a fragment that overlaps with two different holes
 847          * (thus being a superset of a previously-received fragment).
 848          */
 849
 850         if ((h >= thisfrag) && (h->last_byte <= start + len)) {
 851                 /* complete overlap with hole: remove hole */
 852                 if (!h->prev_hole && !h->next_hole) {
 853                         /* last remaining hole */
 854                         done = 1;
 855                 } else if (!h->prev_hole) {
 856                         /* first hole */
 857                         first_hole = h->next_hole;
 858                         payload[h->next_hole].prev_hole = 0;
 859                 } else if (!h->next_hole) {
 860                         /* last hole */
 861                         payload[h->prev_hole].next_hole = 0;
 862                 } else {
 863                         /* in the middle of the list */
 864                         payload[h->next_hole].prev_hole = h->prev_hole;
 865                         payload[h->prev_hole].next_hole = h->next_hole;
 866                 }
 867
 868         } else if (h->last_byte <= start + len) {
 869                 /* overlaps with final part of the hole: shorten this hole */
 870                 h->last_byte = start;
 871
 872         } else if (h >= thisfrag) {
 873                 /* overlaps with initial part of the hole: move this hole */
 874                 newh = thisfrag + (len / 8);
 875                 *newh = *h;
 876                 h = newh;
 877                 if (h->next_hole)
 878                         payload[h->next_hole].prev_hole = (h - payload);
 879                 if (h->prev_hole)
 880                         payload[h->prev_hole].next_hole = (h - payload);
 881                 else
 882                         first_hole = (h - payload);
 883
 884         } else {
 885                 /* fragment sits in the middle: split the hole */
 886                 newh = thisfrag + (len / 8);
 887                 *newh = *h;
 888                 h->last_byte = start;
 889                 h->next_hole = (newh - payload);
 890                 newh->prev_hole = (h - payload);
 891                 if (newh->next_hole)
 892                         payload[newh->next_hole].prev_hole = (newh - payload);
 893         }
 894
 895         /* finally copy this fragment and possibly return whole packet */
 896         memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len);
 897         if (!done)
 898                 return NULL;
 899
 900         localip->ip_len = htons(total_len);
 901         *lenp = total_len + IP_HDR_SIZE;
 902         return localip;
 903 }
 904
 905 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
 906         int *lenp)
 907 {
 908         u16 ip_off = ntohs(ip->ip_off);
 909         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
 910                 return ip; /* not a fragment */
 911         return __net_defragment(ip, lenp);
 912 }
 913
 914 #else /* !CONFIG_IP_DEFRAG */
 915
 916 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
 917         int *lenp)
 918 {
 919         u16 ip_off = ntohs(ip->ip_off);
 920         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
 921                 return ip; /* not a fragment */
 922         return NULL;
 923 }
 924 #endif
 925
 926 /**
 927  * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
 928  * drop others.
 929  *
 930  * @parma ip    IP packet containing the ICMP
 931  */
 932 static void receive_icmp(struct ip_udp_hdr *ip, int len,
 933                         struct in_addr src_ip, struct ethernet_hdr *et)
 934 {
 935         struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
 936
 937         switch (icmph->type) {
 938         case ICMP_REDIRECT:
 939                 if (icmph->code != ICMP_REDIR_HOST)
 940                         return;
 941                 printf(" ICMP Host Redirect to %pI4 ",
 942                        &icmph->un.gateway);
 943                 break;
 944         default:
 945 #if defined(CONFIG_CMD_PING)
 946                 ping_receive(et, ip, len);
 947 #endif
 948 #ifdef CONFIG_CMD_TFTPPUT
 949                 if (packet_icmp_handler)
 950                         packet_icmp_handler(icmph->type, icmph->code,
 951                                             ntohs(ip->udp_dst), src_ip,
 952                                             ntohs(ip->udp_src), icmph->un.data,
 953                                             ntohs(ip->udp_len));
 954 #endif
 955                 break;
 956         }
 957 }
 958
 959 void net_process_received_packet(uchar *in_packet, int len)
 960 {
 961         struct ethernet_hdr *et;
 962         struct ip_udp_hdr *ip;
 963         struct in_addr dst_ip;
 964         struct in_addr src_ip;
 965         int eth_proto;
 966 #if defined(CONFIG_CMD_CDP)
 967         int iscdp;
 968 #endif
 969         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
 970
 971         debug_cond(DEBUG_NET_PKT, "packet received\n");
 972
 973         net_rx_packet = in_packet;
 974         net_rx_packet_len = len;
 975         et = (struct ethernet_hdr *)in_packet;
 976
 977         /* too small packet? */
 978         if (len < ETHER_HDR_SIZE)
 979                 return;
 980
 981 #ifdef CONFIG_API
 982         if (push_packet) {
 983                 (*push_packet)(in_packet, len);
 984                 return;
 985         }
 986 #endif
 987
 988 #if defined(CONFIG_CMD_CDP)
 989         /* keep track if packet is CDP */
 990         iscdp = is_cdp_packet(et->et_dest);
 991 #endif
 992
 993         myvlanid = ntohs(net_our_vlan);
 994         if (myvlanid == (ushort)-1)
 995                 myvlanid = VLAN_NONE;
 996         mynvlanid = ntohs(net_native_vlan);
 997         if (mynvlanid == (ushort)-1)
 998                 mynvlanid = VLAN_NONE;
 999
1000         eth_proto = ntohs(et->et_protlen);
1001
1002         if (eth_proto < 1514) {
1003                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1004                 /*
1005                  *      Got a 802.2 packet.  Check the other protocol field.
1006                  *      XXX VLAN over 802.2+SNAP not implemented!
1007                  */
1008                 eth_proto = ntohs(et802->et_prot);
1009
1010                 ip = (struct ip_udp_hdr *)(in_packet + E802_HDR_SIZE);
1011                 len -= E802_HDR_SIZE;
1012
1013         } else if (eth_proto != PROT_VLAN) {    /* normal packet */
1014                 ip = (struct ip_udp_hdr *)(in_packet + ETHER_HDR_SIZE);
1015                 len -= ETHER_HDR_SIZE;
1016
1017         } else {                        /* VLAN packet */
1018                 struct vlan_ethernet_hdr *vet =
1019                         (struct vlan_ethernet_hdr *)et;
1020
1021                 debug_cond(DEBUG_NET_PKT, "VLAN packet received\n");
1022
1023                 /* too small packet? */
1024                 if (len < VLAN_ETHER_HDR_SIZE)
1025                         return;
1026
1027                 /* if no VLAN active */
1028                 if ((ntohs(net_our_vlan) & VLAN_IDMASK) == VLAN_NONE
1029 #if defined(CONFIG_CMD_CDP)
1030                                 && iscdp == 0
1031 #endif
1032                                 )
1033                         return;
1034
1035                 cti = ntohs(vet->vet_tag);
1036                 vlanid = cti & VLAN_IDMASK;
1037                 eth_proto = ntohs(vet->vet_type);
1038
1039                 ip = (struct ip_udp_hdr *)(in_packet + VLAN_ETHER_HDR_SIZE);
1040                 len -= VLAN_ETHER_HDR_SIZE;
1041         }
1042
1043         debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto);
1044
1045 #if defined(CONFIG_CMD_CDP)
1046         if (iscdp) {
1047                 cdp_receive((uchar *)ip, len);
1048                 return;
1049         }
1050 #endif
1051
1052         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1053                 if (vlanid == VLAN_NONE)
1054                         vlanid = (mynvlanid & VLAN_IDMASK);
1055                 /* not matched? */
1056                 if (vlanid != (myvlanid & VLAN_IDMASK))
1057                         return;
1058         }
1059
1060         switch (eth_proto) {
1061         case PROT_ARP:
1062                 arp_receive(et, ip, len);
1063                 break;
1064
1065 #ifdef CONFIG_CMD_RARP
1066         case PROT_RARP:
1067                 rarp_receive(ip, len);
1068                 break;
1069 #endif
1070         case PROT_IP:
1071                 debug_cond(DEBUG_NET_PKT, "Got IP\n");
1072                 /* Before we start poking the header, make sure it is there */
1073                 if (len < IP_UDP_HDR_SIZE) {
1074                         debug("len bad %d < %lu\n", len,
1075                               (ulong)IP_UDP_HDR_SIZE);
1076                         return;
1077                 }
1078                 /* Check the packet length */
1079                 if (len < ntohs(ip->ip_len)) {
1080                         debug("len bad %d < %d\n", len, ntohs(ip->ip_len));
1081                         return;
1082                 }
1083                 len = ntohs(ip->ip_len);
1084                 debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n",
1085                            len, ip->ip_hl_v & 0xff);
1086
1087                 /* Can't deal with anything except IPv4 */
1088                 if ((ip->ip_hl_v & 0xf0) != 0x40)
1089                         return;
1090                 /* Can't deal with IP options (headers != 20 bytes) */
1091                 if ((ip->ip_hl_v & 0x0f) > 0x05)
1092                         return;
1093                 /* Check the Checksum of the header */
1094                 if (!ip_checksum_ok((uchar *)ip, IP_HDR_SIZE)) {
1095                         debug("checksum bad\n");
1096                         return;
1097                 }
1098                 /* If it is not for us, ignore it */
1099                 dst_ip = net_read_ip(&ip->ip_dst);
1100                 if (net_ip.s_addr && dst_ip.s_addr != net_ip.s_addr &&
1101                     dst_ip.s_addr != 0xFFFFFFFF) {
1102 #ifdef CONFIG_MCAST_TFTP
1103                         if (net_mcast_addr != dst_ip)
1104 #endif
1105                                 return;
1106                 }
1107                 /* Read source IP address for later use */
1108                 src_ip = net_read_ip(&ip->ip_src);
1109                 /*
1110                  * The function returns the unchanged packet if it's not
1111                  * a fragment, and either the complete packet or NULL if
1112                  * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1113                  */
1114                 ip = net_defragment(ip, &len);
1115                 if (!ip)
1116                         return;
1117                 /*
1118                  * watch for ICMP host redirects
1119                  *
1120                  * There is no real handler code (yet). We just watch
1121                  * for ICMP host redirect messages. In case anybody
1122                  * sees these messages: please contact me
1123                  * ([email protected]), or - even better - send me the
1124                  * necessary fixes :-)
1125                  *
1126                  * Note: in all cases where I have seen this so far
1127                  * it was a problem with the router configuration,
1128                  * for instance when a router was configured in the
1129                  * BOOTP reply, but the TFTP server was on the same
1130                  * subnet. So this is probably a warning that your
1131                  * configuration might be wrong. But I'm not really
1132                  * sure if there aren't any other situations.
1133                  *
1134                  * Simon Glass <[email protected]>: We get an ICMP when
1135                  * we send a tftp packet to a dead connection, or when
1136                  * there is no server at the other end.
1137                  */
1138                 if (ip->ip_p == IPPROTO_ICMP) {
1139                         receive_icmp(ip, len, src_ip, et);
1140                         return;
1141                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1142                         return;
1143                 }
1144
1145                 debug_cond(DEBUG_DEV_PKT,
1146                            "received UDP (to=%pI4, from=%pI4, len=%d)\n",
1147                            &dst_ip, &src_ip, len);
1148
1149 #ifdef CONFIG_UDP_CHECKSUM
1150                 if (ip->udp_xsum != 0) {
1151                         ulong   xsum;
1152                         ushort *sumptr;
1153                         ushort  sumlen;
1154
1155                         xsum  = ip->ip_p;
1156                         xsum += (ntohs(ip->udp_len));
1157                         xsum += (ntohl(ip->ip_src.s_addr) >> 16) & 0x0000ffff;
1158                         xsum += (ntohl(ip->ip_src.s_addr) >>  0) & 0x0000ffff;
1159                         xsum += (ntohl(ip->ip_dst.s_addr) >> 16) & 0x0000ffff;
1160                         xsum += (ntohl(ip->ip_dst.s_addr) >>  0) & 0x0000ffff;
1161
1162                         sumlen = ntohs(ip->udp_len);
1163                         sumptr = (ushort *)&(ip->udp_src);
1164
1165                         while (sumlen > 1) {
1166                                 ushort sumdata;
1167
1168                                 sumdata = *sumptr++;
1169                                 xsum += ntohs(sumdata);
1170                                 sumlen -= 2;
1171                         }
1172                         if (sumlen > 0) {
1173                                 ushort sumdata;
1174
1175                                 sumdata = *(unsigned char *)sumptr;
1176                                 sumdata = (sumdata << 8) & 0xff00;
1177                                 xsum += sumdata;
1178                         }
1179                         while ((xsum >> 16) != 0) {
1180                                 xsum = (xsum & 0x0000ffff) +
1181                                        ((xsum >> 16) & 0x0000ffff);
1182                         }
1183                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1184                                 printf(" UDP wrong checksum %08lx %08x\n",
1185                                        xsum, ntohs(ip->udp_xsum));
1186                                 return;
1187                         }
1188                 }
1189 #endif
1190
1191 #if defined(CONFIG_NETCONSOLE) && !(CONFIG_SPL_BUILD)
1192                 nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
1193                                 src_ip,
1194                                 ntohs(ip->udp_dst),
1195                                 ntohs(ip->udp_src),
1196                                 ntohs(ip->udp_len) - UDP_HDR_SIZE);
1197 #endif
1198                 /*
1199                  * IP header OK.  Pass the packet to the current handler.
1200                  */
1201                 (*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE,
1202                                       ntohs(ip->udp_dst),
1203                                       src_ip,
1204                                       ntohs(ip->udp_src),
1205                                       ntohs(ip->udp_len) - UDP_HDR_SIZE);
1206                 break;
1207         }
1208 }
1209
1210 /**********************************************************************/
1211
1212 static int net_check_prereq(enum proto_t protocol)
1213 {
1214         switch (protocol) {
1215                 /* Fall through */
1216 #if defined(CONFIG_CMD_PING)
1217         case PING:
1218                 if (net_ping_ip.s_addr == 0) {
1219                         puts("*** ERROR: ping address not given\n");
1220                         return 1;
1221                 }
1222                 goto common;
1223 #endif
1224 #if defined(CONFIG_CMD_SNTP)
1225         case SNTP:
1226                 if (net_ntp_server.s_addr == 0) {
1227                         puts("*** ERROR: NTP server address not given\n");
1228                         return 1;
1229                 }
1230                 goto common;
1231 #endif
1232 #if defined(CONFIG_CMD_DNS)
1233         case DNS:
1234                 if (net_dns_server.s_addr == 0) {
1235                         puts("*** ERROR: DNS server address not given\n");
1236                         return 1;
1237                 }
1238                 goto common;
1239 #endif
1240 #if defined(CONFIG_CMD_NFS)
1241         case NFS:
1242 #endif
1243                 /* Fall through */
1244         case TFTPGET:
1245         case TFTPPUT:
1246                 if (net_server_ip.s_addr == 0) {
1247                         puts("*** ERROR: `serverip' not set\n");
1248                         return 1;
1249                 }
1250 #if     defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
1251         defined(CONFIG_CMD_DNS)
1252 common:
1253 #endif
1254                 /* Fall through */
1255
1256         case NETCONS:
1257         case TFTPSRV:
1258                 if (net_ip.s_addr == 0) {
1259                         puts("*** ERROR: `ipaddr' not set\n");
1260                         return 1;
1261                 }
1262                 /* Fall through */
1263
1264 #ifdef CONFIG_CMD_RARP
1265         case RARP:
1266 #endif
1267         case BOOTP:
1268         case CDP:
1269         case DHCP:
1270         case LINKLOCAL:
1271                 if (memcmp(net_ethaddr, "\0\0\0\0\0\0", 6) == 0) {
1272                         int num = eth_get_dev_index();
1273
1274                         switch (num) {
1275                         case -1:
1276                                 puts("*** ERROR: No ethernet found.\n");
1277                                 return 1;
1278                         case 0:
1279                                 puts("*** ERROR: `ethaddr' not set\n");
1280                                 break;
1281                         default:
1282                                 printf("*** ERROR: `eth%daddr' not set\n",
1283                                        num);
1284                                 break;
1285                         }
1286
1287                         net_start_again();
1288                         return 2;
1289                 }
1290                 /* Fall through */
1291         default:
1292                 return 0;
1293         }
1294         return 0;               /* OK */
1295 }
1296 /**********************************************************************/
1297
1298 int
1299 net_eth_hdr_size(void)
1300 {
1301         ushort myvlanid;
1302
1303         myvlanid = ntohs(net_our_vlan);
1304         if (myvlanid == (ushort)-1)
1305                 myvlanid = VLAN_NONE;
1306
1307         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1308                 VLAN_ETHER_HDR_SIZE;
1309 }
1310
1311 int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot)
1312 {
1313         struct ethernet_hdr *et = (struct ethernet_hdr *)xet;
1314         ushort myvlanid;
1315
1316         myvlanid = ntohs(net_our_vlan);
1317         if (myvlanid == (ushort)-1)
1318                 myvlanid = VLAN_NONE;
1319
1320         memcpy(et->et_dest, dest_ethaddr, 6);
1321         memcpy(et->et_src, net_ethaddr, 6);
1322         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1323                 et->et_protlen = htons(prot);
1324                 return ETHER_HDR_SIZE;
1325         } else {
1326                 struct vlan_ethernet_hdr *vet =
1327                         (struct vlan_ethernet_hdr *)xet;
1328
1329                 vet->vet_vlan_type = htons(PROT_VLAN);
1330                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1331                 vet->vet_type = htons(prot);
1332                 return VLAN_ETHER_HDR_SIZE;
1333         }
1334 }
1335
1336 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
1337 {
1338         ushort protlen;
1339
1340         memcpy(et->et_dest, addr, 6);
1341         memcpy(et->et_src, net_ethaddr, 6);
1342         protlen = ntohs(et->et_protlen);
1343         if (protlen == PROT_VLAN) {
1344                 struct vlan_ethernet_hdr *vet =
1345                         (struct vlan_ethernet_hdr *)et;
1346                 vet->vet_type = htons(prot);
1347                 return VLAN_ETHER_HDR_SIZE;
1348         } else if (protlen > 1514) {
1349                 et->et_protlen = htons(prot);
1350                 return ETHER_HDR_SIZE;
1351         } else {
1352                 /* 802.2 + SNAP */
1353                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1354                 et802->et_prot = htons(prot);
1355                 return E802_HDR_SIZE;
1356         }
1357 }
1358
1359 void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source)
1360 {
1361         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1362
1363         /*
1364          *      Construct an IP header.
1365          */
1366         /* IP_HDR_SIZE / 4 (not including UDP) */
1367         ip->ip_hl_v  = 0x45;
1368         ip->ip_tos   = 0;
1369         ip->ip_len   = htons(IP_HDR_SIZE);
1370         ip->ip_id    = htons(net_ip_id++);
1371         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1372         ip->ip_ttl   = 255;
1373         ip->ip_sum   = 0;
1374         /* already in network byte order */
1375         net_copy_ip((void *)&ip->ip_src, &source);
1376         /* already in network byte order */
1377         net_copy_ip((void *)&ip->ip_dst, &dest);
1378 }
1379
1380 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport,
1381                         int len)
1382 {
1383         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1384
1385         /*
1386          *      If the data is an odd number of bytes, zero the
1387          *      byte after the last byte so that the checksum
1388          *      will work.
1389          */
1390         if (len & 1)
1391                 pkt[IP_UDP_HDR_SIZE + len] = 0;
1392
1393         net_set_ip_header(pkt, dest, net_ip);
1394         ip->ip_len   = htons(IP_UDP_HDR_SIZE + len);
1395         ip->ip_p     = IPPROTO_UDP;
1396         ip->ip_sum   = compute_ip_checksum(ip, IP_HDR_SIZE);
1397
1398         ip->udp_src  = htons(sport);
1399         ip->udp_dst  = htons(dport);
1400         ip->udp_len  = htons(UDP_HDR_SIZE + len);
1401         ip->udp_xsum = 0;
1402 }
1403
1404 void copy_filename(char *dst, const char *src, int size)
1405 {
1406         if (*src && (*src == '"')) {
1407                 ++src;
1408                 --size;
1409         }
1410
1411         while ((--size > 0) && *src && (*src != '"'))
1412                 *dst++ = *src++;
1413         *dst = '\0';
1414 }
1415
1416 #if     defined(CONFIG_CMD_NFS)         || \
1417         defined(CONFIG_CMD_SNTP)        || \
1418         defined(CONFIG_CMD_DNS)
1419 /*
1420  * make port a little random (1024-17407)
1421  * This keeps the math somewhat trivial to compute, and seems to work with
1422  * all supported protocols/clients/servers
1423  */
1424 unsigned int random_port(void)
1425 {
1426         return 1024 + (get_timer(0) % 0x4000);
1427 }
1428 #endif
1429
1430 void ip_to_string(struct in_addr x, char *s)
1431 {
1432         x.s_addr = ntohl(x.s_addr);
1433         sprintf(s, "%d.%d.%d.%d",
1434                 (int) ((x.s_addr >> 24) & 0xff),
1435                 (int) ((x.s_addr >> 16) & 0xff),
1436                 (int) ((x.s_addr >> 8) & 0xff),
1437                 (int) ((x.s_addr >> 0) & 0xff)
1438         );
1439 }
1440
1441 void vlan_to_string(ushort x, char *s)
1442 {
1443         x = ntohs(x);
1444
1445         if (x == (ushort)-1)
1446                 x = VLAN_NONE;
1447
1448         if (x == VLAN_NONE)
1449                 strcpy(s, "none");
1450         else
1451                 sprintf(s, "%d", x & VLAN_IDMASK);
1452 }
1453
1454 ushort string_to_vlan(const char *s)
1455 {
1456         ushort id;
1457
1458         if (s == NULL)
1459                 return htons(VLAN_NONE);
1460
1461         if (*s < '0' || *s > '9')
1462                 id = VLAN_NONE;
1463         else
1464                 id = (ushort)simple_strtoul(s, NULL, 10);
1465
1466         return htons(id);
1467 }
1468
1469 ushort getenv_vlan(char *var)
1470 {
1471         return string_to_vlan(getenv(var));
1472 }