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  *      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 #if defined(CONFIG_CMD_BOOTCE)
 439                 case BOOTME:
 440                         BootmeStart();
 441                         break;
 442 #endif
 443                 default:
 444                         break;
 445                 }
 446
 447                 break;
 448         }
 449
 450 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 451 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 452         defined(CONFIG_STATUS_LED)                      && \
 453         defined(STATUS_LED_RED)
 454         /*
 455          * Echo the inverted link state to the fault LED.
 456          */
 457         if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
 458                 status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
 459         else
 460                 status_led_set(STATUS_LED_RED, STATUS_LED_ON);
 461 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 462 #endif /* CONFIG_MII, ... */
 463 #ifdef CONFIG_USB_KEYBOARD
 464         net_busy_flag = 1;
 465 #endif
 466
 467         /*
 468          *      Main packet reception loop.  Loop receiving packets until
 469          *      someone sets `net_state' to a state that terminates.
 470          */
 471         for (;;) {
 472                 WATCHDOG_RESET();
 473 #ifdef CONFIG_SHOW_ACTIVITY
 474                 show_activity(1);
 475 #endif
 476                 /*
 477                  *      Check the ethernet for a new packet.  The ethernet
 478                  *      receive routine will process it.
 479                  *      Most drivers return the most recent packet size, but not
 480                  *      errors that may have happened.
 481                  */
 482                 eth_rx();
 483
 484                 /*
 485                  *      Abort if ctrl-c was pressed.
 486                  */
 487                 if (ctrlc()) {
 488                         /* cancel any ARP that may not have completed */
 489                         net_arp_wait_packet_ip.s_addr = 0;
 490
 491                         net_cleanup_loop();
 492                         eth_halt();
 493                         /* Invalidate the last protocol */
 494                         eth_set_last_protocol(BOOTP);
 495
 496                         puts("\nAbort\n");
 497                         /* include a debug print as well incase the debug
 498                            messages are directed to stderr */
 499                         debug_cond(DEBUG_INT_STATE, "--- net_loop Abort!\n");
 500                         goto done;
 501                 }
 502
 503                 arp_timeout_check();
 504
 505                 /*
 506                  *      Check for a timeout, and run the timeout handler
 507                  *      if we have one.
 508                  */
 509                 if (time_handler &&
 510                     (get_timer(time_start) > time_delta)) {
 511                         thand_f *x;
 512
 513 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 514 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 515         defined(CONFIG_STATUS_LED)                      && \
 516         defined(STATUS_LED_RED)
 517                         /*
 518                          * Echo the inverted link state to the fault LED.
 519                          */
 520                         if (miiphy_link(eth_get_dev()->name,
 521                                         CONFIG_SYS_FAULT_MII_ADDR))
 522                                 status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
 523                         else
 524                                 status_led_set(STATUS_LED_RED, STATUS_LED_ON);
 525 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 526 #endif /* CONFIG_MII, ... */
 527                         debug_cond(DEBUG_INT_STATE, "--- net_loop timeout\n");
 528                         x = time_handler;
 529                         time_handler = (thand_f *)0;
 530                         (*x)();
 531                 }
 532
 533                 if (net_state == NETLOOP_FAIL)
 534                         ret = net_start_again();
 535
 536                 switch (net_state) {
 537                 case NETLOOP_RESTART:
 538                         net_restarted = 1;
 539                         goto restart;
 540
 541                 case NETLOOP_SUCCESS:
 542                         net_cleanup_loop();
 543                         if (net_boot_file_size > 0) {
 544                                 printf("Bytes transferred = %d (%x hex)\n",
 545                                        net_boot_file_size, net_boot_file_size);
 546                                 setenv_hex("filesize", net_boot_file_size);
 547                                 setenv_hex("fileaddr", load_addr);
 548                         }
 549                         if (protocol != NETCONS)
 550                                 eth_halt();
 551                         else
 552                                 eth_halt_state_only();
 553
 554                         eth_set_last_protocol(protocol);
 555
 556                         ret = net_boot_file_size;
 557                         debug_cond(DEBUG_INT_STATE, "--- net_loop Success!\n");
 558                         goto done;
 559
 560                 case NETLOOP_FAIL:
 561                         net_cleanup_loop();
 562                         /* Invalidate the last protocol */
 563                         eth_set_last_protocol(BOOTP);
 564                         debug_cond(DEBUG_INT_STATE, "--- net_loop Fail!\n");
 565                         goto done;
 566
 567                 case NETLOOP_CONTINUE:
 568                         continue;
 569                 }
 570         }
 571
 572 done:
 573 #ifdef CONFIG_USB_KEYBOARD
 574         net_busy_flag = 0;
 575 #endif
 576 #ifdef CONFIG_CMD_TFTPPUT
 577         /* Clear out the handlers */
 578         net_set_udp_handler(NULL);
 579         net_set_icmp_handler(NULL);
 580 #endif
 581         return ret;
 582 }
 583
 584 /**********************************************************************/
 585
 586 static void start_again_timeout_handler(void)
 587 {
 588         net_set_state(NETLOOP_RESTART);
 589 }
 590
 591 int net_start_again(void)
 592 {
 593         char *nretry;
 594         int retry_forever = 0;
 595         unsigned long retrycnt = 0;
 596         int ret;
 597
 598         nretry = getenv("netretry");
 599         if (nretry) {
 600                 if (!strcmp(nretry, "yes"))
 601                         retry_forever = 1;
 602                 else if (!strcmp(nretry, "no"))
 603                         retrycnt = 0;
 604                 else if (!strcmp(nretry, "once"))
 605                         retrycnt = 1;
 606                 else
 607                         retrycnt = simple_strtoul(nretry, NULL, 0);
 608         } else {
 609                 retrycnt = 0;
 610                 retry_forever = 0;
 611         }
 612
 613         if ((!retry_forever) && (net_try_count >= retrycnt)) {
 614                 eth_halt();
 615                 net_set_state(NETLOOP_FAIL);
 616                 /*
 617                  * We don't provide a way for the protocol to return an error,
 618                  * but this is almost always the reason.
 619                  */
 620                 return -ETIMEDOUT;
 621         }
 622
 623         net_try_count++;
 624
 625         eth_halt();
 626 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
 627         eth_try_another(!net_restarted);
 628 #endif
 629         ret = eth_init();
 630         if (net_restart_wrap) {
 631                 net_restart_wrap = 0;
 632                 if (net_dev_exists) {
 633                         net_set_timeout_handler(10000UL,
 634                                                 start_again_timeout_handler);
 635                         net_set_udp_handler(NULL);
 636                 } else {
 637                         net_set_state(NETLOOP_FAIL);
 638                 }
 639         } else {
 640                 net_set_state(NETLOOP_RESTART);
 641         }
 642         return ret;
 643 }
 644
 645 /**********************************************************************/
 646 /*
 647  *      Miscelaneous bits.
 648  */
 649
 650 static void dummy_handler(uchar *pkt, unsigned dport,
 651                         struct in_addr sip, unsigned sport,
 652                         unsigned len)
 653 {
 654 }
 655
 656 rxhand_f *net_get_udp_handler(void)
 657 {
 658         return udp_packet_handler;
 659 }
 660
 661 void net_set_udp_handler(rxhand_f *f)
 662 {
 663         debug_cond(DEBUG_INT_STATE, "--- net_loop UDP handler set (%p)\n", f);
 664         if (f == NULL)
 665                 udp_packet_handler = dummy_handler;
 666         else
 667                 udp_packet_handler = f;
 668 }
 669
 670 rxhand_f *net_get_arp_handler(void)
 671 {
 672         return arp_packet_handler;
 673 }
 674
 675 void net_set_arp_handler(rxhand_f *f)
 676 {
 677         debug_cond(DEBUG_INT_STATE, "--- net_loop ARP handler set (%p)\n", f);
 678         if (f == NULL)
 679                 arp_packet_handler = dummy_handler;
 680         else
 681                 arp_packet_handler = f;
 682 }
 683
 684 #ifdef CONFIG_CMD_TFTPPUT
 685 void net_set_icmp_handler(rxhand_icmp_f *f)
 686 {
 687         packet_icmp_handler = f;
 688 }
 689 #endif
 690
 691 void net_set_timeout_handler(ulong iv, thand_f *f)
 692 {
 693         if (iv == 0) {
 694                 debug_cond(DEBUG_INT_STATE,
 695                            "--- net_loop timeout handler cancelled\n");
 696                 time_handler = (thand_f *)0;
 697         } else {
 698                 debug_cond(DEBUG_INT_STATE,
 699                            "--- net_loop timeout handler set (%p)\n", f);
 700                 time_handler = f;
 701                 time_start = get_timer(0);
 702                 time_delta = iv * CONFIG_SYS_HZ / 1000;
 703         }
 704 }
 705
 706 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
 707                 int payload_len)
 708 {
 709         uchar *pkt;
 710         int eth_hdr_size;
 711         int pkt_hdr_size;
 712
 713         /* make sure the net_tx_packet is initialized (net_init() was called) */
 714         assert(net_tx_packet != NULL);
 715         if (net_tx_packet == NULL)
 716                 return -1;
 717
 718         /* convert to new style broadcast */
 719         if (dest.s_addr == 0)
 720                 dest.s_addr = 0xFFFFFFFF;
 721
 722         /* if broadcast, make the ether address a broadcast and don't do ARP */
 723         if (dest.s_addr == 0xFFFFFFFF)
 724                 ether = (uchar *)net_bcast_ethaddr;
 725
 726         pkt = (uchar *)net_tx_packet;
 727
 728         eth_hdr_size = net_set_ether(pkt, ether, PROT_IP);
 729         pkt += eth_hdr_size;
 730         net_set_udp_header(pkt, dest, dport, sport, payload_len);
 731         pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
 732
 733         /* if MAC address was not discovered yet, do an ARP request */
 734         if (memcmp(ether, net_null_ethaddr, 6) == 0) {
 735                 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest);
 736
 737                 /* save the ip and eth addr for the packet to send after arp */
 738                 net_arp_wait_packet_ip = dest;
 739                 arp_wait_packet_ethaddr = ether;
 740
 741                 /* size of the waiting packet */
 742                 arp_wait_tx_packet_size = pkt_hdr_size + payload_len;
 743
 744                 /* and do the ARP request */
 745                 arp_wait_try = 1;
 746                 arp_wait_timer_start = get_timer(0);
 747                 arp_request();
 748                 return 1;       /* waiting */
 749         } else {
 750                 debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
 751                            &dest, ether);
 752                 net_send_packet(net_tx_packet, pkt_hdr_size + payload_len);
 753                 return 0;       /* transmitted */
 754         }
 755 }
 756
 757 #ifdef CONFIG_IP_DEFRAG
 758 /*
 759  * This function collects fragments in a single packet, according
 760  * to the algorithm in RFC815. It returns NULL or the pointer to
 761  * a complete packet, in static storage
 762  */
 763 #ifndef CONFIG_NET_MAXDEFRAG
 764 #define CONFIG_NET_MAXDEFRAG 16384
 765 #endif
 766 /*
 767  * MAXDEFRAG, above, is chosen in the config file and  is real data
 768  * so we need to add the NFS overhead, which is more than TFTP.
 769  * To use sizeof in the internal unnamed structures, we need a real
 770  * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately).
 771  * The compiler doesn't complain nor allocates the actual structure
 772  */
 773 static struct rpc_t rpc_specimen;
 774 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply))
 775
 776 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE)
 777
 778 /*
 779  * this is the packet being assembled, either data or frag control.
 780  * Fragments go by 8 bytes, so this union must be 8 bytes long
 781  */
 782 struct hole {
 783         /* first_byte is address of this structure */
 784         u16 last_byte;  /* last byte in this hole + 1 (begin of next hole) */
 785         u16 next_hole;  /* index of next (in 8-b blocks), 0 == none */
 786         u16 prev_hole;  /* index of prev, 0 == none */
 787         u16 unused;
 788 };
 789
 790 static struct ip_udp_hdr *__net_defragment(struct ip_udp_hdr *ip, int *lenp)
 791 {
 792         static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
 793         static u16 first_hole, total_len;
 794         struct hole *payload, *thisfrag, *h, *newh;
 795         struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff;
 796         uchar *indata = (uchar *)ip;
 797         int offset8, start, len, done = 0;
 798         u16 ip_off = ntohs(ip->ip_off);
 799
 800         /* payload starts after IP header, this fragment is in there */
 801         payload = (struct hole *)(pkt_buff + IP_HDR_SIZE);
 802         offset8 =  (ip_off & IP_OFFS);
 803         thisfrag = payload + offset8;
 804         start = offset8 * 8;
 805         len = ntohs(ip->ip_len) - IP_HDR_SIZE;
 806
 807         if (start + len > IP_MAXUDP) /* fragment extends too far */
 808                 return NULL;
 809
 810         if (!total_len || localip->ip_id != ip->ip_id) {
 811                 /* new (or different) packet, reset structs */
 812                 total_len = 0xffff;
 813                 payload[0].last_byte = ~0;
 814                 payload[0].next_hole = 0;
 815                 payload[0].prev_hole = 0;
 816                 first_hole = 0;
 817                 /* any IP header will work, copy the first we received */
 818                 memcpy(localip, ip, IP_HDR_SIZE);
 819         }
 820
 821         /*
 822          * What follows is the reassembly algorithm. We use the payload
 823          * array as a linked list of hole descriptors, as each hole starts
 824          * at a multiple of 8 bytes. However, last byte can be whatever value,
 825          * so it is represented as byte count, not as 8-byte blocks.
 826          */
 827
 828         h = payload + first_hole;
 829         while (h->last_byte < start) {
 830                 if (!h->next_hole) {
 831                         /* no hole that far away */
 832                         return NULL;
 833                 }
 834                 h = payload + h->next_hole;
 835         }
 836
 837         /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
 838         if (offset8 + ((len + 7) / 8) <= h - payload) {
 839                 /* no overlap with holes (dup fragment?) */
 840                 return NULL;
 841         }
 842
 843         if (!(ip_off & IP_FLAGS_MFRAG)) {
 844                 /* no more fragmentss: truncate this (last) hole */
 845                 total_len = start + len;
 846                 h->last_byte = start + len;
 847         }
 848
 849         /*
 850          * There is some overlap: fix the hole list. This code doesn't
 851          * deal with a fragment that overlaps with two different holes
 852          * (thus being a superset of a previously-received fragment).
 853          */
 854
 855         if ((h >= thisfrag) && (h->last_byte <= start + len)) {
 856                 /* complete overlap with hole: remove hole */
 857                 if (!h->prev_hole && !h->next_hole) {
 858                         /* last remaining hole */
 859                         done = 1;
 860                 } else if (!h->prev_hole) {
 861                         /* first hole */
 862                         first_hole = h->next_hole;
 863                         payload[h->next_hole].prev_hole = 0;
 864                 } else if (!h->next_hole) {
 865                         /* last hole */
 866                         payload[h->prev_hole].next_hole = 0;
 867                 } else {
 868                         /* in the middle of the list */
 869                         payload[h->next_hole].prev_hole = h->prev_hole;
 870                         payload[h->prev_hole].next_hole = h->next_hole;
 871                 }
 872
 873         } else if (h->last_byte <= start + len) {
 874                 /* overlaps with final part of the hole: shorten this hole */
 875                 h->last_byte = start;
 876
 877         } else if (h >= thisfrag) {
 878                 /* overlaps with initial part of the hole: move this hole */
 879                 newh = thisfrag + (len / 8);
 880                 *newh = *h;
 881                 h = newh;
 882                 if (h->next_hole)
 883                         payload[h->next_hole].prev_hole = (h - payload);
 884                 if (h->prev_hole)
 885                         payload[h->prev_hole].next_hole = (h - payload);
 886                 else
 887                         first_hole = (h - payload);
 888
 889         } else {
 890                 /* fragment sits in the middle: split the hole */
 891                 newh = thisfrag + (len / 8);
 892                 *newh = *h;
 893                 h->last_byte = start;
 894                 h->next_hole = (newh - payload);
 895                 newh->prev_hole = (h - payload);
 896                 if (newh->next_hole)
 897                         payload[newh->next_hole].prev_hole = (newh - payload);
 898         }
 899
 900         /* finally copy this fragment and possibly return whole packet */
 901         memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len);
 902         if (!done)
 903                 return NULL;
 904
 905         localip->ip_len = htons(total_len);
 906         *lenp = total_len + IP_HDR_SIZE;
 907         return localip;
 908 }
 909
 910 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
 911         int *lenp)
 912 {
 913         u16 ip_off = ntohs(ip->ip_off);
 914         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
 915                 return ip; /* not a fragment */
 916         return __net_defragment(ip, lenp);
 917 }
 918
 919 #else /* !CONFIG_IP_DEFRAG */
 920
 921 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
 922         int *lenp)
 923 {
 924         u16 ip_off = ntohs(ip->ip_off);
 925         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
 926                 return ip; /* not a fragment */
 927         return NULL;
 928 }
 929 #endif
 930
 931 /**
 932  * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
 933  * drop others.
 934  *
 935  * @parma ip    IP packet containing the ICMP
 936  */
 937 static void receive_icmp(struct ip_udp_hdr *ip, int len,
 938                         struct in_addr src_ip, struct ethernet_hdr *et)
 939 {
 940         struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
 941
 942         switch (icmph->type) {
 943         case ICMP_REDIRECT:
 944                 if (icmph->code != ICMP_REDIR_HOST)
 945                         return;
 946                 printf(" ICMP Host Redirect to %pI4 ",
 947                        &icmph->un.gateway);
 948                 break;
 949         default:
 950 #if defined(CONFIG_CMD_PING)
 951                 ping_receive(et, ip, len);
 952 #endif
 953 #ifdef CONFIG_CMD_TFTPPUT
 954                 if (packet_icmp_handler)
 955                         packet_icmp_handler(icmph->type, icmph->code,
 956                                             ntohs(ip->udp_dst), src_ip,
 957                                             ntohs(ip->udp_src), icmph->un.data,
 958                                             ntohs(ip->udp_len));
 959 #endif
 960                 break;
 961         }
 962 }
 963
 964 void net_process_received_packet(uchar *in_packet, int len)
 965 {
 966         struct ethernet_hdr *et;
 967         struct ip_udp_hdr *ip;
 968         struct in_addr dst_ip;
 969         struct in_addr src_ip;
 970         int eth_proto;
 971 #if defined(CONFIG_CMD_CDP)
 972         int iscdp;
 973 #endif
 974         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
 975
 976         debug_cond(DEBUG_NET_PKT, "packet received\n");
 977
 978         net_rx_packet = in_packet;
 979         net_rx_packet_len = len;
 980         et = (struct ethernet_hdr *)in_packet;
 981
 982         /* too small packet? */
 983         if (len < ETHER_HDR_SIZE)
 984                 return;
 985
 986 #ifdef CONFIG_API
 987         if (push_packet) {
 988                 (*push_packet)(in_packet, len);
 989                 return;
 990         }
 991 #endif
 992
 993 #if defined(CONFIG_CMD_CDP)
 994         /* keep track if packet is CDP */
 995         iscdp = is_cdp_packet(et->et_dest);
 996 #endif
 997
 998         myvlanid = ntohs(net_our_vlan);
 999         if (myvlanid == (ushort)-1)
1000                 myvlanid = VLAN_NONE;
1001         mynvlanid = ntohs(net_native_vlan);
1002         if (mynvlanid == (ushort)-1)
1003                 mynvlanid = VLAN_NONE;
1004
1005         eth_proto = ntohs(et->et_protlen);
1006
1007         if (eth_proto < 1514) {
1008                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1009                 /*
1010                  *      Got a 802.2 packet.  Check the other protocol field.
1011                  *      XXX VLAN over 802.2+SNAP not implemented!
1012                  */
1013                 eth_proto = ntohs(et802->et_prot);
1014
1015                 ip = (struct ip_udp_hdr *)(in_packet + E802_HDR_SIZE);
1016                 len -= E802_HDR_SIZE;
1017
1018         } else if (eth_proto != PROT_VLAN) {    /* normal packet */
1019                 ip = (struct ip_udp_hdr *)(in_packet + ETHER_HDR_SIZE);
1020                 len -= ETHER_HDR_SIZE;
1021
1022         } else {                        /* VLAN packet */
1023                 struct vlan_ethernet_hdr *vet =
1024                         (struct vlan_ethernet_hdr *)et;
1025
1026                 debug_cond(DEBUG_NET_PKT, "VLAN packet received\n");
1027
1028                 /* too small packet? */
1029                 if (len < VLAN_ETHER_HDR_SIZE)
1030                         return;
1031
1032                 /* if no VLAN active */
1033                 if ((ntohs(net_our_vlan) & VLAN_IDMASK) == VLAN_NONE
1034 #if defined(CONFIG_CMD_CDP)
1035                                 && iscdp == 0
1036 #endif
1037                                 )
1038                         return;
1039
1040                 cti = ntohs(vet->vet_tag);
1041                 vlanid = cti & VLAN_IDMASK;
1042                 eth_proto = ntohs(vet->vet_type);
1043
1044                 ip = (struct ip_udp_hdr *)(in_packet + VLAN_ETHER_HDR_SIZE);
1045                 len -= VLAN_ETHER_HDR_SIZE;
1046         }
1047
1048         debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto);
1049
1050 #if defined(CONFIG_CMD_CDP)
1051         if (iscdp) {
1052                 cdp_receive((uchar *)ip, len);
1053                 return;
1054         }
1055 #endif
1056
1057         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1058                 if (vlanid == VLAN_NONE)
1059                         vlanid = (mynvlanid & VLAN_IDMASK);
1060                 /* not matched? */
1061                 if (vlanid != (myvlanid & VLAN_IDMASK))
1062                         return;
1063         }
1064
1065         switch (eth_proto) {
1066         case PROT_ARP:
1067                 arp_receive(et, ip, len);
1068                 break;
1069
1070 #ifdef CONFIG_CMD_RARP
1071         case PROT_RARP:
1072                 rarp_receive(ip, len);
1073                 break;
1074 #endif
1075         case PROT_IP:
1076                 debug_cond(DEBUG_NET_PKT, "Got IP\n");
1077                 /* Before we start poking the header, make sure it is there */
1078                 if (len < IP_UDP_HDR_SIZE) {
1079                         debug("len bad %d < %lu\n", len,
1080                               (ulong)IP_UDP_HDR_SIZE);
1081                         return;
1082                 }
1083                 /* Check the packet length */
1084                 if (len < ntohs(ip->ip_len)) {
1085                         debug("len bad %d < %d\n", len, ntohs(ip->ip_len));
1086                         return;
1087                 }
1088                 len = ntohs(ip->ip_len);
1089                 debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n",
1090                            len, ip->ip_hl_v & 0xff);
1091
1092                 /* Can't deal with anything except IPv4 */
1093                 if ((ip->ip_hl_v & 0xf0) != 0x40)
1094                         return;
1095                 /* Can't deal with IP options (headers != 20 bytes) */
1096                 if ((ip->ip_hl_v & 0x0f) > 0x05)
1097                         return;
1098                 /* Check the Checksum of the header */
1099                 if (!ip_checksum_ok((uchar *)ip, IP_HDR_SIZE)) {
1100                         debug("checksum bad\n");
1101                         return;
1102                 }
1103                 /* If it is not for us, ignore it */
1104                 dst_ip = net_read_ip(&ip->ip_dst);
1105                 if (net_ip.s_addr && dst_ip.s_addr != net_ip.s_addr &&
1106                     dst_ip.s_addr != 0xFFFFFFFF) {
1107 #ifdef CONFIG_MCAST_TFTP
1108                         if (net_mcast_addr != dst_ip)
1109 #endif
1110                                 return;
1111                 }
1112                 /* Read source IP address for later use */
1113                 src_ip = net_read_ip(&ip->ip_src);
1114                 /*
1115                  * The function returns the unchanged packet if it's not
1116                  * a fragment, and either the complete packet or NULL if
1117                  * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1118                  */
1119                 ip = net_defragment(ip, &len);
1120                 if (!ip)
1121                         return;
1122                 /*
1123                  * watch for ICMP host redirects
1124                  *
1125                  * There is no real handler code (yet). We just watch
1126                  * for ICMP host redirect messages. In case anybody
1127                  * sees these messages: please contact me
1128                  * (wd@denx.de), or - even better - send me the
1129                  * necessary fixes :-)
1130                  *
1131                  * Note: in all cases where I have seen this so far
1132                  * it was a problem with the router configuration,
1133                  * for instance when a router was configured in the
1134                  * BOOTP reply, but the TFTP server was on the same
1135                  * subnet. So this is probably a warning that your
1136                  * configuration might be wrong. But I'm not really
1137                  * sure if there aren't any other situations.
1138                  *
1139                  * Simon Glass <sjg@chromium.org>: We get an ICMP when
1140                  * we send a tftp packet to a dead connection, or when
1141                  * there is no server at the other end.
1142                  */
1143                 if (ip->ip_p == IPPROTO_ICMP) {
1144                         receive_icmp(ip, len, src_ip, et);
1145                         return;
1146                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1147                         return;
1148                 }
1149
1150                 debug_cond(DEBUG_DEV_PKT,
1151                            "received UDP (to=%pI4, from=%pI4, len=%d)\n",
1152                            &dst_ip, &src_ip, len);
1153
1154 #ifdef CONFIG_UDP_CHECKSUM
1155                 if (ip->udp_xsum != 0) {
1156                         ulong   xsum;
1157                         ushort *sumptr;
1158                         ushort  sumlen;
1159
1160                         xsum  = ip->ip_p;
1161                         xsum += (ntohs(ip->udp_len));
1162                         xsum += (ntohl(ip->ip_src.s_addr) >> 16) & 0x0000ffff;
1163                         xsum += (ntohl(ip->ip_src.s_addr) >>  0) & 0x0000ffff;
1164                         xsum += (ntohl(ip->ip_dst.s_addr) >> 16) & 0x0000ffff;
1165                         xsum += (ntohl(ip->ip_dst.s_addr) >>  0) & 0x0000ffff;
1166
1167                         sumlen = ntohs(ip->udp_len);
1168                         sumptr = (ushort *)&(ip->udp_src);
1169
1170                         while (sumlen > 1) {
1171                                 ushort sumdata;
1172
1173                                 sumdata = *sumptr++;
1174                                 xsum += ntohs(sumdata);
1175                                 sumlen -= 2;
1176                         }
1177                         if (sumlen > 0) {
1178                                 ushort sumdata;
1179
1180                                 sumdata = *(unsigned char *)sumptr;
1181                                 sumdata = (sumdata << 8) & 0xff00;
1182                                 xsum += sumdata;
1183                         }
1184                         while ((xsum >> 16) != 0) {
1185                                 xsum = (xsum & 0x0000ffff) +
1186                                        ((xsum >> 16) & 0x0000ffff);
1187                         }
1188                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1189                                 printf(" UDP wrong checksum %08lx %08x\n",
1190                                        xsum, ntohs(ip->udp_xsum));
1191                                 return;
1192                         }
1193                 }
1194 #endif
1195
1196 #if defined(CONFIG_NETCONSOLE) && !(CONFIG_SPL_BUILD)
1197                 nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
1198                                 src_ip,
1199                                 ntohs(ip->udp_dst),
1200                                 ntohs(ip->udp_src),
1201                                 ntohs(ip->udp_len) - UDP_HDR_SIZE);
1202 #endif
1203                 /*
1204                  * IP header OK.  Pass the packet to the current handler.
1205                  */
1206                 (*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE,
1207                                       ntohs(ip->udp_dst),
1208                                       src_ip,
1209                                       ntohs(ip->udp_src),
1210                                       ntohs(ip->udp_len) - UDP_HDR_SIZE);
1211                 break;
1212         }
1213 }
1214
1215 /**********************************************************************/
1216
1217 static int net_check_prereq(enum proto_t protocol)
1218 {
1219         switch (protocol) {
1220 #if defined(CONFIG_CMD_PING)
1221         case PING:
1222                 if (net_ping_ip.s_addr == 0) {
1223                         puts("*** ERROR: ping address not given\n");
1224                         return 1;
1225                 }
1226                 goto common;
1227 #endif
1228 #if defined(CONFIG_CMD_SNTP)
1229         case SNTP:
1230                 if (net_ntp_server.s_addr == 0) {
1231                         puts("*** ERROR: NTP server address not given\n");
1232                         return 1;
1233                 }
1234                 goto common;
1235 #endif
1236 #if defined(CONFIG_CMD_DNS)
1237         case DNS:
1238                 if (net_dns_server.s_addr == 0) {
1239                         puts("*** ERROR: DNS server address not given\n");
1240                         return 1;
1241                 }
1242                 goto common;
1243 #endif
1244 #if defined(CONFIG_CMD_NFS)
1245         case NFS:
1246 #endif
1247                 /* Fall through */
1248         case TFTPGET:
1249         case TFTPPUT:
1250                 if (net_server_ip.s_addr == 0) {
1251                         puts("*** ERROR: `serverip' not set\n");
1252                         return 1;
1253                 }
1254 #if     defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
1255         defined(CONFIG_CMD_DNS)
1256 common:
1257 #endif
1258                 /* Fall through */
1259
1260         case BOOTME:
1261         case NETCONS:
1262         case TFTPSRV:
1263                 if (net_ip.s_addr == 0) {
1264                         puts("*** ERROR: `ipaddr' not set\n");
1265                         return 1;
1266                 }
1267                 /* Fall through */
1268
1269 #ifdef CONFIG_CMD_RARP
1270         case RARP:
1271 #endif
1272         case BOOTP:
1273         case CDP:
1274         case DHCP:
1275         case LINKLOCAL:
1276                 if (memcmp(net_ethaddr, "\0\0\0\0\0\0", 6) == 0) {
1277                         int num = eth_get_dev_index();
1278
1279                         switch (num) {
1280                         case -1:
1281                                 puts("*** ERROR: No ethernet found.\n");
1282                                 return 1;
1283                         case 0:
1284                                 puts("*** ERROR: `ethaddr' not set\n");
1285                                 break;
1286                         default:
1287                                 printf("*** ERROR: `eth%daddr' not set\n",
1288                                        num);
1289                                 break;
1290                         }
1291
1292                         net_start_again();
1293                         return 2;
1294                 }
1295                 /* Fall through */
1296         default:
1297                 return 0;
1298         }
1299         return 0;               /* OK */
1300 }
1301 /**********************************************************************/
1302
1303 int
1304 net_eth_hdr_size(void)
1305 {
1306         ushort myvlanid;
1307
1308         myvlanid = ntohs(net_our_vlan);
1309         if (myvlanid == (ushort)-1)
1310                 myvlanid = VLAN_NONE;
1311
1312         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1313                 VLAN_ETHER_HDR_SIZE;
1314 }
1315
1316 int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot)
1317 {
1318         struct ethernet_hdr *et = (struct ethernet_hdr *)xet;
1319         ushort myvlanid;
1320
1321         myvlanid = ntohs(net_our_vlan);
1322         if (myvlanid == (ushort)-1)
1323                 myvlanid = VLAN_NONE;
1324
1325         memcpy(et->et_dest, dest_ethaddr, 6);
1326         memcpy(et->et_src, net_ethaddr, 6);
1327         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1328                 et->et_protlen = htons(prot);
1329                 return ETHER_HDR_SIZE;
1330         } else {
1331                 struct vlan_ethernet_hdr *vet =
1332                         (struct vlan_ethernet_hdr *)xet;
1333
1334                 vet->vet_vlan_type = htons(PROT_VLAN);
1335                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1336                 vet->vet_type = htons(prot);
1337                 return VLAN_ETHER_HDR_SIZE;
1338         }
1339 }
1340
1341 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
1342 {
1343         ushort protlen;
1344
1345         memcpy(et->et_dest, addr, 6);
1346         memcpy(et->et_src, net_ethaddr, 6);
1347         protlen = ntohs(et->et_protlen);
1348         if (protlen == PROT_VLAN) {
1349                 struct vlan_ethernet_hdr *vet =
1350                         (struct vlan_ethernet_hdr *)et;
1351                 vet->vet_type = htons(prot);
1352                 return VLAN_ETHER_HDR_SIZE;
1353         } else if (protlen > 1514) {
1354                 et->et_protlen = htons(prot);
1355                 return ETHER_HDR_SIZE;
1356         } else {
1357                 /* 802.2 + SNAP */
1358                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1359                 et802->et_prot = htons(prot);
1360                 return E802_HDR_SIZE;
1361         }
1362 }
1363
1364 void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source)
1365 {
1366         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1367
1368         /*
1369          *      Construct an IP header.
1370          */
1371         /* IP_HDR_SIZE / 4 (not including UDP) */
1372         ip->ip_hl_v  = 0x45;
1373         ip->ip_tos   = 0;
1374         ip->ip_len   = htons(IP_HDR_SIZE);
1375         ip->ip_id    = htons(net_ip_id++);
1376         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1377         ip->ip_ttl   = 255;
1378         ip->ip_sum   = 0;
1379         /* already in network byte order */
1380         net_copy_ip((void *)&ip->ip_src, &source);
1381         /* already in network byte order */
1382         net_copy_ip((void *)&ip->ip_dst, &dest);
1383 }
1384
1385 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport,
1386                         int len)
1387 {
1388         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1389
1390         /*
1391          *      If the data is an odd number of bytes, zero the
1392          *      byte after the last byte so that the checksum
1393          *      will work.
1394          */
1395         if (len & 1)
1396                 pkt[IP_UDP_HDR_SIZE + len] = 0;
1397
1398         net_set_ip_header(pkt, dest, net_ip);
1399         ip->ip_len   = htons(IP_UDP_HDR_SIZE + len);
1400         ip->ip_p     = IPPROTO_UDP;
1401         ip->ip_sum   = compute_ip_checksum(ip, IP_HDR_SIZE);
1402
1403         ip->udp_src  = htons(sport);
1404         ip->udp_dst  = htons(dport);
1405         ip->udp_len  = htons(UDP_HDR_SIZE + len);
1406         ip->udp_xsum = 0;
1407 }
1408
1409 void copy_filename(char *dst, const char *src, int size)
1410 {
1411         if (*src && (*src == '"')) {
1412                 ++src;
1413                 --size;
1414         }
1415
1416         while ((--size > 0) && *src && (*src != '"'))
1417                 *dst++ = *src++;
1418         *dst = '\0';
1419 }
1420
1421 #if     defined(CONFIG_CMD_NFS)         || \
1422         defined(CONFIG_CMD_SNTP)        || \
1423         defined(CONFIG_CMD_DNS)
1424 /*
1425  * make port a little random (1024-17407)
1426  * This keeps the math somewhat trivial to compute, and seems to work with
1427  * all supported protocols/clients/servers
1428  */
1429 unsigned int random_port(void)
1430 {
1431         return 1024 + (get_timer(0) % 0x4000);
1432 }
1433 #endif
1434
1435 void ip_to_string(struct in_addr x, char *s)
1436 {
1437         x.s_addr = ntohl(x.s_addr);
1438         sprintf(s, "%d.%d.%d.%d",
1439                 (int) ((x.s_addr >> 24) & 0xff),
1440                 (int) ((x.s_addr >> 16) & 0xff),
1441                 (int) ((x.s_addr >> 8) & 0xff),
1442                 (int) ((x.s_addr >> 0) & 0xff)
1443         );
1444 }
1445
1446 void vlan_to_string(ushort x, char *s)
1447 {
1448         x = ntohs(x);
1449
1450         if (x == (ushort)-1)
1451                 x = VLAN_NONE;
1452
1453         if (x == VLAN_NONE)
1454                 strcpy(s, "none");
1455         else
1456                 sprintf(s, "%d", x & VLAN_IDMASK);
1457 }
1458
1459 ushort string_to_vlan(const char *s)
1460 {
1461         ushort id;
1462
1463         if (s == NULL)
1464                 return htons(VLAN_NONE);
1465
1466         if (*s < '0' || *s > '9')
1467                 id = VLAN_NONE;
1468         else
1469                 id = (ushort)simple_strtoul(s, NULL, 10);
1470
1471         return htons(id);
1472 }
1473
1474 ushort getenv_vlan(char *var)
1475 {
1476         return string_to_vlan(getenv(var));
1477 }