net/net.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *      Copied from Linux Monitor (LiMon) - Networking.
   4  *
   5  *      Copyright 1994 - 2000 Neil Russell.
   6  *      (See License)
   7  *      Copyright 2000 Roland Borde
   8  *      Copyright 2000 Paolo Scaffardi
   9  *      Copyright 2000-2002 Wolfgang Denk, wd@denx.de
  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  * WOL:
  83  *
  84  *      Prerequisites:  - own ethernet address
  85  *      We want:        - magic packet or timeout
  86  *      Next step:      none
  87  */
  88
  89
  90 #include <common.h>
  91 #include <command.h>
  92 #include <console.h>
  93 #include <environment.h>
  94 #include <errno.h>
  95 #include <net.h>
  96 #include <net/fastboot.h>
  97 #include <net/tftp.h>
  98 #if defined(CONFIG_LED_STATUS)
  99 #include <miiphy.h>
 100 #include <status_led.h>
 101 #endif
 102 #include <watchdog.h>
 103 #include <linux/compiler.h>
 104 #include "arp.h"
 105 #include "bootp.h"
 106 #include "cdp.h"
 107 #if defined(CONFIG_CMD_DNS)
 108 #include "dns.h"
 109 #endif
 110 #include "link_local.h"
 111 #include "nfs.h"
 112 #include "ping.h"
 113 #include "rarp.h"
 114 #if defined(CONFIG_CMD_SNTP)
 115 #include "sntp.h"
 116 #endif
 117 #if defined(CONFIG_CMD_WOL)
 118 #include "wol.h"
 119 #endif
 120
 121 /** BOOTP EXTENTIONS **/
 122
 123 /* Our subnet mask (0=unknown) */
 124 struct in_addr net_netmask;
 125 /* Our gateways IP address */
 126 struct in_addr net_gateway;
 127 /* Our DNS IP address */
 128 struct in_addr net_dns_server;
 129 #if defined(CONFIG_BOOTP_DNS2)
 130 /* Our 2nd DNS IP address */
 131 struct in_addr net_dns_server2;
 132 #endif
 133
 134 #ifdef CONFIG_MCAST_TFTP        /* Multicast TFTP */
 135 struct in_addr net_mcast_addr;
 136 #endif
 137
 138 /** END OF BOOTP EXTENTIONS **/
 139
 140 /* Our ethernet address */
 141 u8 net_ethaddr[6];
 142 /* Boot server enet address */
 143 u8 net_server_ethaddr[6];
 144 /* Our IP addr (0 = unknown) */
 145 struct in_addr  net_ip;
 146 /* Server IP addr (0 = unknown) */
 147 struct in_addr  net_server_ip;
 148 /* Current receive packet */
 149 uchar *net_rx_packet;
 150 /* Current rx packet length */
 151 int             net_rx_packet_len;
 152 /* IP packet ID */
 153 static unsigned net_ip_id;
 154 /* Ethernet bcast address */
 155 const u8 net_bcast_ethaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 156 const u8 net_null_ethaddr[6];
 157 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
 158 void (*push_packet)(void *, int len) = 0;
 159 #endif
 160 /* Network loop state */
 161 enum net_loop_state net_state;
 162 /* Tried all network devices */
 163 int             net_restart_wrap;
 164 /* Network loop restarted */
 165 static int      net_restarted;
 166 /* At least one device configured */
 167 static int      net_dev_exists;
 168
 169 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
 170 /* default is without VLAN */
 171 ushort          net_our_vlan = 0xFFFF;
 172 /* ditto */
 173 ushort          net_native_vlan = 0xFFFF;
 174
 175 /* Boot File name */
 176 char net_boot_file_name[1024];
 177 /* The actual transferred size of the bootfile (in bytes) */
 178 u32 net_boot_file_size;
 179 /* Boot file size in blocks as reported by the DHCP server */
 180 u32 net_boot_file_expected_size_in_blocks;
 181
 182 #if defined(CONFIG_CMD_SNTP)
 183 /* NTP server IP address */
 184 struct in_addr  net_ntp_server;
 185 /* offset time from UTC */
 186 int             net_ntp_time_offset;
 187 #endif
 188
 189 static uchar net_pkt_buf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 190 /* Receive packets */
 191 uchar *net_rx_packets[PKTBUFSRX];
 192 /* Current UDP RX packet handler */
 193 static rxhand_f *udp_packet_handler;
 194 /* Current ARP RX packet handler */
 195 static rxhand_f *arp_packet_handler;
 196 #ifdef CONFIG_CMD_TFTPPUT
 197 /* Current ICMP rx handler */
 198 static rxhand_icmp_f *packet_icmp_handler;
 199 #endif
 200 /* Current timeout handler */
 201 static thand_f *time_handler;
 202 /* Time base value */
 203 static ulong    time_start;
 204 /* Current timeout value */
 205 static ulong    time_delta;
 206 /* THE transmit packet */
 207 uchar *net_tx_packet;
 208
 209 static int net_check_prereq(enum proto_t protocol);
 210
 211 static int net_try_count;
 212
 213 int __maybe_unused net_busy_flag;
 214
 215 /**********************************************************************/
 216
 217 static int on_bootfile(const char *name, const char *value, enum env_op op,
 218         int flags)
 219 {
 220         if (flags & H_PROGRAMMATIC)
 221                 return 0;
 222
 223         switch (op) {
 224         case env_op_create:
 225         case env_op_overwrite:
 226                 copy_filename(net_boot_file_name, value,
 227                               sizeof(net_boot_file_name));
 228                 break;
 229         default:
 230                 break;
 231         }
 232
 233         return 0;
 234 }
 235 U_BOOT_ENV_CALLBACK(bootfile, on_bootfile);
 236
 237 static int on_ipaddr(const char *name, const char *value, enum env_op op,
 238         int flags)
 239 {
 240         if (flags & H_PROGRAMMATIC)
 241                 return 0;
 242
 243         net_ip = string_to_ip(value);
 244
 245         return 0;
 246 }
 247 U_BOOT_ENV_CALLBACK(ipaddr, on_ipaddr);
 248
 249 static int on_gatewayip(const char *name, const char *value, enum env_op op,
 250         int flags)
 251 {
 252         if (flags & H_PROGRAMMATIC)
 253                 return 0;
 254
 255         net_gateway = string_to_ip(value);
 256
 257         return 0;
 258 }
 259 U_BOOT_ENV_CALLBACK(gatewayip, on_gatewayip);
 260
 261 static int on_netmask(const char *name, const char *value, enum env_op op,
 262         int flags)
 263 {
 264         if (flags & H_PROGRAMMATIC)
 265                 return 0;
 266
 267         net_netmask = string_to_ip(value);
 268
 269         return 0;
 270 }
 271 U_BOOT_ENV_CALLBACK(netmask, on_netmask);
 272
 273 static int on_serverip(const char *name, const char *value, enum env_op op,
 274         int flags)
 275 {
 276         if (flags & H_PROGRAMMATIC)
 277                 return 0;
 278
 279         net_server_ip = string_to_ip(value);
 280
 281         return 0;
 282 }
 283 U_BOOT_ENV_CALLBACK(serverip, on_serverip);
 284
 285 static int on_nvlan(const char *name, const char *value, enum env_op op,
 286         int flags)
 287 {
 288         if (flags & H_PROGRAMMATIC)
 289                 return 0;
 290
 291         net_native_vlan = string_to_vlan(value);
 292
 293         return 0;
 294 }
 295 U_BOOT_ENV_CALLBACK(nvlan, on_nvlan);
 296
 297 static int on_vlan(const char *name, const char *value, enum env_op op,
 298         int flags)
 299 {
 300         if (flags & H_PROGRAMMATIC)
 301                 return 0;
 302
 303         net_our_vlan = string_to_vlan(value);
 304
 305         return 0;
 306 }
 307 U_BOOT_ENV_CALLBACK(vlan, on_vlan);
 308
 309 #if defined(CONFIG_CMD_DNS)
 310 static int on_dnsip(const char *name, const char *value, enum env_op op,
 311         int flags)
 312 {
 313         if (flags & H_PROGRAMMATIC)
 314                 return 0;
 315
 316         net_dns_server = string_to_ip(value);
 317
 318         return 0;
 319 }
 320 U_BOOT_ENV_CALLBACK(dnsip, on_dnsip);
 321 #endif
 322
 323 /*
 324  * Check if autoload is enabled. If so, use either NFS or TFTP to download
 325  * the boot file.
 326  */
 327 void net_auto_load(void)
 328 {
 329 #if defined(CONFIG_CMD_NFS)
 330         const char *s = env_get("autoload");
 331
 332         if (s != NULL && strcmp(s, "NFS") == 0) {
 333                 /*
 334                  * Use NFS to load the bootfile.
 335                  */
 336                 nfs_start();
 337                 return;
 338         }
 339 #endif
 340         if (env_get_yesno("autoload") == 0) {
 341                 /*
 342                  * Just use BOOTP/RARP to configure system;
 343                  * Do not use TFTP to load the bootfile.
 344                  */
 345                 net_set_state(NETLOOP_SUCCESS);
 346                 return;
 347         }
 348         tftp_start(TFTPGET);
 349 }
 350
 351 static void net_init_loop(void)
 352 {
 353         if (eth_get_dev())
 354                 memcpy(net_ethaddr, eth_get_ethaddr(), 6);
 355
 356         return;
 357 }
 358
 359 static void net_clear_handlers(void)
 360 {
 361         net_set_udp_handler(NULL);
 362         net_set_arp_handler(NULL);
 363         net_set_timeout_handler(0, NULL);
 364 }
 365
 366 static void net_cleanup_loop(void)
 367 {
 368         net_clear_handlers();
 369 }
 370
 371 void net_init(void)
 372 {
 373         static int first_call = 1;
 374
 375         if (first_call) {
 376                 /*
 377                  *      Setup packet buffers, aligned correctly.
 378                  */
 379                 int i;
 380
 381                 net_tx_packet = &net_pkt_buf[0] + (PKTALIGN - 1);
 382                 net_tx_packet -= (ulong)net_tx_packet % PKTALIGN;
 383                 for (i = 0; i < PKTBUFSRX; i++) {
 384                         net_rx_packets[i] = net_tx_packet +
 385                                 (i + 1) * PKTSIZE_ALIGN;
 386                 }
 387                 arp_init();
 388                 net_clear_handlers();
 389
 390                 /* Only need to setup buffer pointers once. */
 391                 first_call = 0;
 392         }
 393
 394         net_init_loop();
 395 }
 396
 397 /**********************************************************************/
 398 /*
 399  *      Main network processing loop.
 400  */
 401
 402 int net_loop(enum proto_t protocol)
 403 {
 404         int ret = -EINVAL;
 405         enum net_loop_state prev_net_state = net_state;
 406
 407         net_restarted = 0;
 408         net_dev_exists = 0;
 409         net_try_count = 1;
 410         debug_cond(DEBUG_INT_STATE, "--- net_loop Entry\n");
 411
 412         bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
 413         net_init();
 414         if (eth_is_on_demand_init() || protocol != NETCONS) {
 415                 eth_halt();
 416                 eth_set_current();
 417                 ret = eth_init();
 418                 if (ret < 0) {
 419                         eth_halt();
 420                         return ret;
 421                 }
 422         } else {
 423                 eth_init_state_only();
 424         }
 425 restart:
 426 #ifdef CONFIG_USB_KEYBOARD
 427         net_busy_flag = 0;
 428 #endif
 429         net_set_state(NETLOOP_CONTINUE);
 430
 431         /*
 432          *      Start the ball rolling with the given start function.  From
 433          *      here on, this code is a state machine driven by received
 434          *      packets and timer events.
 435          */
 436         debug_cond(DEBUG_INT_STATE, "--- net_loop Init\n");
 437         net_init_loop();
 438
 439         switch (net_check_prereq(protocol)) {
 440         case 1:
 441                 /* network not configured */
 442                 eth_halt();
 443                 net_set_state(prev_net_state);
 444                 return -ENODEV;
 445
 446         case 2:
 447                 /* network device not configured */
 448                 break;
 449
 450         case 0:
 451                 net_dev_exists = 1;
 452                 net_boot_file_size = 0;
 453                 switch (protocol) {
 454                 case TFTPGET:
 455 #ifdef CONFIG_CMD_TFTPPUT
 456                 case TFTPPUT:
 457 #endif
 458                         /* always use ARP to get server ethernet address */
 459                         tftp_start(protocol);
 460                         break;
 461 #ifdef CONFIG_CMD_TFTPSRV
 462                 case TFTPSRV:
 463                         tftp_start_server();
 464                         break;
 465 #endif
 466 #ifdef CONFIG_UDP_FUNCTION_FASTBOOT
 467                 case FASTBOOT:
 468                         fastboot_start_server();
 469                         break;
 470 #endif
 471 #if defined(CONFIG_CMD_DHCP)
 472                 case DHCP:
 473                         bootp_reset();
 474                         net_ip.s_addr = 0;
 475                         dhcp_request();         /* Basically same as BOOTP */
 476                         break;
 477 #endif
 478
 479                 case BOOTP:
 480                         bootp_reset();
 481                         net_ip.s_addr = 0;
 482                         bootp_request();
 483                         break;
 484
 485 #if defined(CONFIG_CMD_RARP)
 486                 case RARP:
 487                         rarp_try = 0;
 488                         net_ip.s_addr = 0;
 489                         rarp_request();
 490                         break;
 491 #endif
 492 #if defined(CONFIG_CMD_PING)
 493                 case PING:
 494                         ping_start();
 495                         break;
 496 #endif
 497 #if defined(CONFIG_CMD_NFS)
 498                 case NFS:
 499                         nfs_start();
 500                         break;
 501 #endif
 502 #if defined(CONFIG_CMD_CDP)
 503                 case CDP:
 504                         cdp_start();
 505                         break;
 506 #endif
 507 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
 508                 case NETCONS:
 509                         nc_start();
 510                         break;
 511 #endif
 512 #if defined(CONFIG_CMD_SNTP)
 513                 case SNTP:
 514                         sntp_start();
 515                         break;
 516 #endif
 517 #if defined(CONFIG_CMD_DNS)
 518                 case DNS:
 519                         dns_start();
 520                         break;
 521 #endif
 522 #if defined(CONFIG_CMD_LINK_LOCAL)
 523                 case LINKLOCAL:
 524                         link_local_start();
 525                         break;
 526 #endif
 527 #if defined(CONFIG_CMD_WOL)
 528                 case WOL:
 529                         wol_start();
 530                         break;
 531 #endif
 532                 default:
 533                         break;
 534                 }
 535
 536                 break;
 537         }
 538
 539 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 540 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 541         defined(CONFIG_LED_STATUS)                      && \
 542         defined(CONFIG_LED_STATUS_RED)
 543         /*
 544          * Echo the inverted link state to the fault LED.
 545          */
 546         if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
 547                 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_OFF);
 548         else
 549                 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_ON);
 550 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 551 #endif /* CONFIG_MII, ... */
 552 #ifdef CONFIG_USB_KEYBOARD
 553         net_busy_flag = 1;
 554 #endif
 555
 556         /*
 557          *      Main packet reception loop.  Loop receiving packets until
 558          *      someone sets `net_state' to a state that terminates.
 559          */
 560         for (;;) {
 561                 WATCHDOG_RESET();
 562 #ifdef CONFIG_SHOW_ACTIVITY
 563                 show_activity(1);
 564 #endif
 565                 if (arp_timeout_check() > 0)
 566                         time_start = get_timer(0);
 567
 568                 /*
 569                  *      Check the ethernet for a new packet.  The ethernet
 570                  *      receive routine will process it.
 571                  *      Most drivers return the most recent packet size, but not
 572                  *      errors that may have happened.
 573                  */
 574                 eth_rx();
 575
 576                 /*
 577                  *      Abort if ctrl-c was pressed.
 578                  */
 579                 if (ctrlc()) {
 580                         /* cancel any ARP that may not have completed */
 581                         net_arp_wait_packet_ip.s_addr = 0;
 582
 583                         net_cleanup_loop();
 584                         eth_halt();
 585                         /* Invalidate the last protocol */
 586                         eth_set_last_protocol(BOOTP);
 587
 588                         puts("\nAbort\n");
 589                         /* include a debug print as well incase the debug
 590                            messages are directed to stderr */
 591                         debug_cond(DEBUG_INT_STATE, "--- net_loop Abort!\n");
 592                         ret = -EINTR;
 593                         goto done;
 594                 }
 595
 596                 /*
 597                  *      Check for a timeout, and run the timeout handler
 598                  *      if we have one.
 599                  */
 600                 if (time_handler &&
 601                     ((get_timer(0) - time_start) > time_delta)) {
 602                         thand_f *x;
 603
 604 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 605 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 606         defined(CONFIG_LED_STATUS)                      && \
 607         defined(CONFIG_LED_STATUS_RED)
 608                         /*
 609                          * Echo the inverted link state to the fault LED.
 610                          */
 611                         if (miiphy_link(eth_get_dev()->name,
 612                                         CONFIG_SYS_FAULT_MII_ADDR))
 613                                 status_led_set(CONFIG_LED_STATUS_RED,
 614                                                CONFIG_LED_STATUS_OFF);
 615                         else
 616                                 status_led_set(CONFIG_LED_STATUS_RED,
 617                                                CONFIG_LED_STATUS_ON);
 618 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 619 #endif /* CONFIG_MII, ... */
 620                         debug_cond(DEBUG_INT_STATE, "--- net_loop timeout\n");
 621                         x = time_handler;
 622                         time_handler = (thand_f *)0;
 623                         (*x)();
 624                 }
 625
 626                 if (net_state == NETLOOP_FAIL)
 627                         ret = net_start_again();
 628
 629                 switch (net_state) {
 630                 case NETLOOP_RESTART:
 631                         net_restarted = 1;
 632                         goto restart;
 633
 634                 case NETLOOP_SUCCESS:
 635                         net_cleanup_loop();
 636                         if (net_boot_file_size > 0) {
 637                                 printf("Bytes transferred = %d (%x hex)\n",
 638                                        net_boot_file_size, net_boot_file_size);
 639                                 env_set_hex("filesize", net_boot_file_size);
 640                                 env_set_hex("fileaddr", load_addr);
 641                         }
 642                         if (protocol != NETCONS)
 643                                 eth_halt();
 644                         else
 645                                 eth_halt_state_only();
 646
 647                         eth_set_last_protocol(protocol);
 648
 649                         ret = net_boot_file_size;
 650                         debug_cond(DEBUG_INT_STATE, "--- net_loop Success!\n");
 651                         goto done;
 652
 653                 case NETLOOP_FAIL:
 654                         net_cleanup_loop();
 655                         /* Invalidate the last protocol */
 656                         eth_set_last_protocol(BOOTP);
 657                         debug_cond(DEBUG_INT_STATE, "--- net_loop Fail!\n");
 658                         goto done;
 659
 660                 case NETLOOP_CONTINUE:
 661                         continue;
 662                 }
 663         }
 664
 665 done:
 666 #ifdef CONFIG_USB_KEYBOARD
 667         net_busy_flag = 0;
 668 #endif
 669 #ifdef CONFIG_CMD_TFTPPUT
 670         /* Clear out the handlers */
 671         net_set_udp_handler(NULL);
 672         net_set_icmp_handler(NULL);
 673 #endif
 674         net_set_state(prev_net_state);
 675         return ret;
 676 }
 677
 678 /**********************************************************************/
 679
 680 static void start_again_timeout_handler(void)
 681 {
 682         net_set_state(NETLOOP_RESTART);
 683 }
 684
 685 int net_start_again(void)
 686 {
 687         char *nretry;
 688         int retry_forever = 0;
 689         unsigned long retrycnt = 0;
 690         int ret;
 691
 692         nretry = env_get("netretry");
 693         if (nretry) {
 694                 if (!strcmp(nretry, "yes"))
 695                         retry_forever = 1;
 696                 else if (!strcmp(nretry, "no"))
 697                         retrycnt = 0;
 698                 else if (!strcmp(nretry, "once"))
 699                         retrycnt = 1;
 700                 else
 701                         retrycnt = simple_strtoul(nretry, NULL, 0);
 702         } else {
 703                 retrycnt = 0;
 704                 retry_forever = 0;
 705         }
 706
 707         if ((!retry_forever) && (net_try_count > retrycnt)) {
 708                 eth_halt();
 709                 net_set_state(NETLOOP_FAIL);
 710                 /*
 711                  * We don't provide a way for the protocol to return an error,
 712                  * but this is almost always the reason.
 713                  */
 714                 return -ETIMEDOUT;
 715         }
 716
 717         net_try_count++;
 718
 719         eth_halt();
 720 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
 721         eth_try_another(!net_restarted);
 722 #endif
 723         ret = eth_init();
 724         if (net_restart_wrap) {
 725                 net_restart_wrap = 0;
 726                 if (net_dev_exists) {
 727                         net_set_timeout_handler(10000UL,
 728                                                 start_again_timeout_handler);
 729                         net_set_udp_handler(NULL);
 730                 } else {
 731                         net_set_state(NETLOOP_FAIL);
 732                 }
 733         } else {
 734                 net_set_state(NETLOOP_RESTART);
 735         }
 736         return ret;
 737 }
 738
 739 /**********************************************************************/
 740 /*
 741  *      Miscelaneous bits.
 742  */
 743
 744 static void dummy_handler(uchar *pkt, unsigned dport,
 745                         struct in_addr sip, unsigned sport,
 746                         unsigned len)
 747 {
 748 }
 749
 750 rxhand_f *net_get_udp_handler(void)
 751 {
 752         return udp_packet_handler;
 753 }
 754
 755 void net_set_udp_handler(rxhand_f *f)
 756 {
 757         debug_cond(DEBUG_INT_STATE, "--- net_loop UDP handler set (%p)\n", f);
 758         if (f == NULL)
 759                 udp_packet_handler = dummy_handler;
 760         else
 761                 udp_packet_handler = f;
 762 }
 763
 764 rxhand_f *net_get_arp_handler(void)
 765 {
 766         return arp_packet_handler;
 767 }
 768
 769 void net_set_arp_handler(rxhand_f *f)
 770 {
 771         debug_cond(DEBUG_INT_STATE, "--- net_loop ARP handler set (%p)\n", f);
 772         if (f == NULL)
 773                 arp_packet_handler = dummy_handler;
 774         else
 775                 arp_packet_handler = f;
 776 }
 777
 778 #ifdef CONFIG_CMD_TFTPPUT
 779 void net_set_icmp_handler(rxhand_icmp_f *f)
 780 {
 781         packet_icmp_handler = f;
 782 }
 783 #endif
 784
 785 void net_set_timeout_handler(ulong iv, thand_f *f)
 786 {
 787         if (iv == 0) {
 788                 debug_cond(DEBUG_INT_STATE,
 789                            "--- net_loop timeout handler cancelled\n");
 790                 time_handler = (thand_f *)0;
 791         } else {
 792                 debug_cond(DEBUG_INT_STATE,
 793                            "--- net_loop timeout handler set (%p)\n", f);
 794                 time_handler = f;
 795                 time_start = get_timer(0);
 796                 time_delta = iv * CONFIG_SYS_HZ / 1000;
 797         }
 798 }
 799
 800 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
 801                 int payload_len)
 802 {
 803         uchar *pkt;
 804         int eth_hdr_size;
 805         int pkt_hdr_size;
 806
 807         /* make sure the net_tx_packet is initialized (net_init() was called) */
 808         assert(net_tx_packet != NULL);
 809         if (net_tx_packet == NULL)
 810                 return -1;
 811
 812         /* convert to new style broadcast */
 813         if (dest.s_addr == 0)
 814                 dest.s_addr = 0xFFFFFFFF;
 815
 816         /* if broadcast, make the ether address a broadcast and don't do ARP */
 817         if (dest.s_addr == 0xFFFFFFFF)
 818                 ether = (uchar *)net_bcast_ethaddr;
 819
 820         pkt = (uchar *)net_tx_packet;
 821
 822         eth_hdr_size = net_set_ether(pkt, ether, PROT_IP);
 823         pkt += eth_hdr_size;
 824         net_set_udp_header(pkt, dest, dport, sport, payload_len);
 825         pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
 826
 827         /* if MAC address was not discovered yet, do an ARP request */
 828         if (memcmp(ether, net_null_ethaddr, 6) == 0) {
 829                 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest);
 830
 831                 /* save the ip and eth addr for the packet to send after arp */
 832                 net_arp_wait_packet_ip = dest;
 833                 arp_wait_packet_ethaddr = ether;
 834
 835                 /* size of the waiting packet */
 836                 arp_wait_tx_packet_size = pkt_hdr_size + payload_len;
 837
 838                 /* and do the ARP request */
 839                 arp_wait_try = 1;
 840                 arp_wait_timer_start = get_timer(0);
 841                 arp_request();
 842                 return 1;       /* waiting */
 843         } else {
 844                 debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
 845                            &dest, ether);
 846                 net_send_packet(net_tx_packet, pkt_hdr_size + payload_len);
 847                 return 0;       /* transmitted */
 848         }
 849 }
 850
 851 #ifdef CONFIG_IP_DEFRAG
 852 /*
 853  * This function collects fragments in a single packet, according
 854  * to the algorithm in RFC815. It returns NULL or the pointer to
 855  * a complete packet, in static storage
 856  */
 857 #ifndef CONFIG_NET_MAXDEFRAG
 858 #define CONFIG_NET_MAXDEFRAG 16384
 859 #endif
 860 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG)
 861
 862 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE)
 863
 864 /*
 865  * this is the packet being assembled, either data or frag control.
 866  * Fragments go by 8 bytes, so this union must be 8 bytes long
 867  */
 868 struct hole {
 869         /* first_byte is address of this structure */
 870         u16 last_byte;  /* last byte in this hole + 1 (begin of next hole) */
 871         u16 next_hole;  /* index of next (in 8-b blocks), 0 == none */
 872         u16 prev_hole;  /* index of prev, 0 == none */
 873         u16 unused;
 874 };
 875
 876 static struct ip_udp_hdr *__net_defragment(struct ip_udp_hdr *ip, int *lenp)
 877 {
 878         static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
 879         static u16 first_hole, total_len;
 880         struct hole *payload, *thisfrag, *h, *newh;
 881         struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff;
 882         uchar *indata = (uchar *)ip;
 883         int offset8, start, len, done = 0;
 884         u16 ip_off = ntohs(ip->ip_off);
 885
 886         /* payload starts after IP header, this fragment is in there */
 887         payload = (struct hole *)(pkt_buff + IP_HDR_SIZE);
 888         offset8 =  (ip_off & IP_OFFS);
 889         thisfrag = payload + offset8;
 890         start = offset8 * 8;
 891         len = ntohs(ip->ip_len) - IP_HDR_SIZE;
 892
 893         if (start + len > IP_MAXUDP) /* fragment extends too far */
 894                 return NULL;
 895
 896         if (!total_len || localip->ip_id != ip->ip_id) {
 897                 /* new (or different) packet, reset structs */
 898                 total_len = 0xffff;
 899                 payload[0].last_byte = ~0;
 900                 payload[0].next_hole = 0;
 901                 payload[0].prev_hole = 0;
 902                 first_hole = 0;
 903                 /* any IP header will work, copy the first we received */
 904                 memcpy(localip, ip, IP_HDR_SIZE);
 905         }
 906
 907         /*
 908          * What follows is the reassembly algorithm. We use the payload
 909          * array as a linked list of hole descriptors, as each hole starts
 910          * at a multiple of 8 bytes. However, last byte can be whatever value,
 911          * so it is represented as byte count, not as 8-byte blocks.
 912          */
 913
 914         h = payload + first_hole;
 915         while (h->last_byte < start) {
 916                 if (!h->next_hole) {
 917                         /* no hole that far away */
 918                         return NULL;
 919                 }
 920                 h = payload + h->next_hole;
 921         }
 922
 923         /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
 924         if (offset8 + ((len + 7) / 8) <= h - payload) {
 925                 /* no overlap with holes (dup fragment?) */
 926                 return NULL;
 927         }
 928
 929         if (!(ip_off & IP_FLAGS_MFRAG)) {
 930                 /* no more fragmentss: truncate this (last) hole */
 931                 total_len = start + len;
 932                 h->last_byte = start + len;
 933         }
 934
 935         /*
 936          * There is some overlap: fix the hole list. This code doesn't
 937          * deal with a fragment that overlaps with two different holes
 938          * (thus being a superset of a previously-received fragment).
 939          */
 940
 941         if ((h >= thisfrag) && (h->last_byte <= start + len)) {
 942                 /* complete overlap with hole: remove hole */
 943                 if (!h->prev_hole && !h->next_hole) {
 944                         /* last remaining hole */
 945                         done = 1;
 946                 } else if (!h->prev_hole) {
 947                         /* first hole */
 948                         first_hole = h->next_hole;
 949                         payload[h->next_hole].prev_hole = 0;
 950                 } else if (!h->next_hole) {
 951                         /* last hole */
 952                         payload[h->prev_hole].next_hole = 0;
 953                 } else {
 954                         /* in the middle of the list */
 955                         payload[h->next_hole].prev_hole = h->prev_hole;
 956                         payload[h->prev_hole].next_hole = h->next_hole;
 957                 }
 958
 959         } else if (h->last_byte <= start + len) {
 960                 /* overlaps with final part of the hole: shorten this hole */
 961                 h->last_byte = start;
 962
 963         } else if (h >= thisfrag) {
 964                 /* overlaps with initial part of the hole: move this hole */
 965                 newh = thisfrag + (len / 8);
 966                 *newh = *h;
 967                 h = newh;
 968                 if (h->next_hole)
 969                         payload[h->next_hole].prev_hole = (h - payload);
 970                 if (h->prev_hole)
 971                         payload[h->prev_hole].next_hole = (h - payload);
 972                 else
 973                         first_hole = (h - payload);
 974
 975         } else {
 976                 /* fragment sits in the middle: split the hole */
 977                 newh = thisfrag + (len / 8);
 978                 *newh = *h;
 979                 h->last_byte = start;
 980                 h->next_hole = (newh - payload);
 981                 newh->prev_hole = (h - payload);
 982                 if (newh->next_hole)
 983                         payload[newh->next_hole].prev_hole = (newh - payload);
 984         }
 985
 986         /* finally copy this fragment and possibly return whole packet */
 987         memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len);
 988         if (!done)
 989                 return NULL;
 990
 991         localip->ip_len = htons(total_len);
 992         *lenp = total_len + IP_HDR_SIZE;
 993         return localip;
 994 }
 995
 996 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
 997         int *lenp)
 998 {
 999         u16 ip_off = ntohs(ip->ip_off);
1000         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1001                 return ip; /* not a fragment */
1002         return __net_defragment(ip, lenp);
1003 }
1004
1005 #else /* !CONFIG_IP_DEFRAG */
1006
1007 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
1008         int *lenp)
1009 {
1010         u16 ip_off = ntohs(ip->ip_off);
1011         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1012                 return ip; /* not a fragment */
1013         return NULL;
1014 }
1015 #endif
1016
1017 /**
1018  * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
1019  * drop others.
1020  *
1021  * @parma ip    IP packet containing the ICMP
1022  */
1023 static void receive_icmp(struct ip_udp_hdr *ip, int len,
1024                         struct in_addr src_ip, struct ethernet_hdr *et)
1025 {
1026         struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
1027
1028         switch (icmph->type) {
1029         case ICMP_REDIRECT:
1030                 if (icmph->code != ICMP_REDIR_HOST)
1031                         return;
1032                 printf(" ICMP Host Redirect to %pI4 ",
1033                        &icmph->un.gateway);
1034                 break;
1035         default:
1036 #if defined(CONFIG_CMD_PING)
1037                 ping_receive(et, ip, len);
1038 #endif
1039 #ifdef CONFIG_CMD_TFTPPUT
1040                 if (packet_icmp_handler)
1041                         packet_icmp_handler(icmph->type, icmph->code,
1042                                             ntohs(ip->udp_dst), src_ip,
1043                                             ntohs(ip->udp_src), icmph->un.data,
1044                                             ntohs(ip->udp_len));
1045 #endif
1046                 break;
1047         }
1048 }
1049
1050 void net_process_received_packet(uchar *in_packet, int len)
1051 {
1052         struct ethernet_hdr *et;
1053         struct ip_udp_hdr *ip;
1054         struct in_addr dst_ip;
1055         struct in_addr src_ip;
1056         int eth_proto;
1057 #if defined(CONFIG_CMD_CDP)
1058         int iscdp;
1059 #endif
1060         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1061
1062         debug_cond(DEBUG_NET_PKT, "packet received\n");
1063
1064         net_rx_packet = in_packet;
1065         net_rx_packet_len = len;
1066         et = (struct ethernet_hdr *)in_packet;
1067
1068         /* too small packet? */
1069         if (len < ETHER_HDR_SIZE)
1070                 return;
1071
1072 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
1073         if (push_packet) {
1074                 (*push_packet)(in_packet, len);
1075                 return;
1076         }
1077 #endif
1078
1079 #if defined(CONFIG_CMD_CDP)
1080         /* keep track if packet is CDP */
1081         iscdp = is_cdp_packet(et->et_dest);
1082 #endif
1083
1084         myvlanid = ntohs(net_our_vlan);
1085         if (myvlanid == (ushort)-1)
1086                 myvlanid = VLAN_NONE;
1087         mynvlanid = ntohs(net_native_vlan);
1088         if (mynvlanid == (ushort)-1)
1089                 mynvlanid = VLAN_NONE;
1090
1091         eth_proto = ntohs(et->et_protlen);
1092
1093         if (eth_proto < 1514) {
1094                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1095                 /*
1096                  *      Got a 802.2 packet.  Check the other protocol field.
1097                  *      XXX VLAN over 802.2+SNAP not implemented!
1098                  */
1099                 eth_proto = ntohs(et802->et_prot);
1100
1101                 ip = (struct ip_udp_hdr *)(in_packet + E802_HDR_SIZE);
1102                 len -= E802_HDR_SIZE;
1103
1104         } else if (eth_proto != PROT_VLAN) {    /* normal packet */
1105                 ip = (struct ip_udp_hdr *)(in_packet + ETHER_HDR_SIZE);
1106                 len -= ETHER_HDR_SIZE;
1107
1108         } else {                        /* VLAN packet */
1109                 struct vlan_ethernet_hdr *vet =
1110                         (struct vlan_ethernet_hdr *)et;
1111
1112                 debug_cond(DEBUG_NET_PKT, "VLAN packet received\n");
1113
1114                 /* too small packet? */
1115                 if (len < VLAN_ETHER_HDR_SIZE)
1116                         return;
1117
1118                 /* if no VLAN active */
1119                 if ((ntohs(net_our_vlan) & VLAN_IDMASK) == VLAN_NONE
1120 #if defined(CONFIG_CMD_CDP)
1121                                 && iscdp == 0
1122 #endif
1123                                 )
1124                         return;
1125
1126                 cti = ntohs(vet->vet_tag);
1127                 vlanid = cti & VLAN_IDMASK;
1128                 eth_proto = ntohs(vet->vet_type);
1129
1130                 ip = (struct ip_udp_hdr *)(in_packet + VLAN_ETHER_HDR_SIZE);
1131                 len -= VLAN_ETHER_HDR_SIZE;
1132         }
1133
1134         debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto);
1135
1136 #if defined(CONFIG_CMD_CDP)
1137         if (iscdp) {
1138                 cdp_receive((uchar *)ip, len);
1139                 return;
1140         }
1141 #endif
1142
1143         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1144                 if (vlanid == VLAN_NONE)
1145                         vlanid = (mynvlanid & VLAN_IDMASK);
1146                 /* not matched? */
1147                 if (vlanid != (myvlanid & VLAN_IDMASK))
1148                         return;
1149         }
1150
1151         switch (eth_proto) {
1152         case PROT_ARP:
1153                 arp_receive(et, ip, len);
1154                 break;
1155
1156 #ifdef CONFIG_CMD_RARP
1157         case PROT_RARP:
1158                 rarp_receive(ip, len);
1159                 break;
1160 #endif
1161         case PROT_IP:
1162                 debug_cond(DEBUG_NET_PKT, "Got IP\n");
1163                 /* Before we start poking the header, make sure it is there */
1164                 if (len < IP_UDP_HDR_SIZE) {
1165                         debug("len bad %d < %lu\n", len,
1166                               (ulong)IP_UDP_HDR_SIZE);
1167                         return;
1168                 }
1169                 /* Check the packet length */
1170                 if (len < ntohs(ip->ip_len)) {
1171                         debug("len bad %d < %d\n", len, ntohs(ip->ip_len));
1172                         return;
1173                 }
1174                 len = ntohs(ip->ip_len);
1175                 debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n",
1176                            len, ip->ip_hl_v & 0xff);
1177
1178                 /* Can't deal with anything except IPv4 */
1179                 if ((ip->ip_hl_v & 0xf0) != 0x40)
1180                         return;
1181                 /* Can't deal with IP options (headers != 20 bytes) */
1182                 if ((ip->ip_hl_v & 0x0f) > 0x05)
1183                         return;
1184                 /* Check the Checksum of the header */
1185                 if (!ip_checksum_ok((uchar *)ip, IP_HDR_SIZE)) {
1186                         debug("checksum bad\n");
1187                         return;
1188                 }
1189                 /* If it is not for us, ignore it */
1190                 dst_ip = net_read_ip(&ip->ip_dst);
1191                 if (net_ip.s_addr && dst_ip.s_addr != net_ip.s_addr &&
1192                     dst_ip.s_addr != 0xFFFFFFFF) {
1193 #ifdef CONFIG_MCAST_TFTP
1194                         if (net_mcast_addr != dst_ip)
1195 #endif
1196                                 return;
1197                 }
1198                 /* Read source IP address for later use */
1199                 src_ip = net_read_ip(&ip->ip_src);
1200                 /*
1201                  * The function returns the unchanged packet if it's not
1202                  * a fragment, and either the complete packet or NULL if
1203                  * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1204                  */
1205                 ip = net_defragment(ip, &len);
1206                 if (!ip)
1207                         return;
1208                 /*
1209                  * watch for ICMP host redirects
1210                  *
1211                  * There is no real handler code (yet). We just watch
1212                  * for ICMP host redirect messages. In case anybody
1213                  * sees these messages: please contact me
1214                  * (wd@denx.de), or - even better - send me the
1215                  * necessary fixes :-)
1216                  *
1217                  * Note: in all cases where I have seen this so far
1218                  * it was a problem with the router configuration,
1219                  * for instance when a router was configured in the
1220                  * BOOTP reply, but the TFTP server was on the same
1221                  * subnet. So this is probably a warning that your
1222                  * configuration might be wrong. But I'm not really
1223                  * sure if there aren't any other situations.
1224                  *
1225                  * Simon Glass <sjg@chromium.org>: We get an ICMP when
1226                  * we send a tftp packet to a dead connection, or when
1227                  * there is no server at the other end.
1228                  */
1229                 if (ip->ip_p == IPPROTO_ICMP) {
1230                         receive_icmp(ip, len, src_ip, et);
1231                         return;
1232                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1233                         return;
1234                 }
1235
1236                 debug_cond(DEBUG_DEV_PKT,
1237                            "received UDP (to=%pI4, from=%pI4, len=%d)\n",
1238                            &dst_ip, &src_ip, len);
1239
1240 #ifdef CONFIG_UDP_CHECKSUM
1241                 if (ip->udp_xsum != 0) {
1242                         ulong   xsum;
1243                         ushort *sumptr;
1244                         ushort  sumlen;
1245
1246                         xsum  = ip->ip_p;
1247                         xsum += (ntohs(ip->udp_len));
1248                         xsum += (ntohl(ip->ip_src.s_addr) >> 16) & 0x0000ffff;
1249                         xsum += (ntohl(ip->ip_src.s_addr) >>  0) & 0x0000ffff;
1250                         xsum += (ntohl(ip->ip_dst.s_addr) >> 16) & 0x0000ffff;
1251                         xsum += (ntohl(ip->ip_dst.s_addr) >>  0) & 0x0000ffff;
1252
1253                         sumlen = ntohs(ip->udp_len);
1254                         sumptr = (ushort *)&(ip->udp_src);
1255
1256                         while (sumlen > 1) {
1257                                 ushort sumdata;
1258
1259                                 sumdata = *sumptr++;
1260                                 xsum += ntohs(sumdata);
1261                                 sumlen -= 2;
1262                         }
1263                         if (sumlen > 0) {
1264                                 ushort sumdata;
1265
1266                                 sumdata = *(unsigned char *)sumptr;
1267                                 sumdata = (sumdata << 8) & 0xff00;
1268                                 xsum += sumdata;
1269                         }
1270                         while ((xsum >> 16) != 0) {
1271                                 xsum = (xsum & 0x0000ffff) +
1272                                        ((xsum >> 16) & 0x0000ffff);
1273                         }
1274                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1275                                 printf(" UDP wrong checksum %08lx %08x\n",
1276                                        xsum, ntohs(ip->udp_xsum));
1277                                 return;
1278                         }
1279                 }
1280 #endif
1281
1282 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
1283                 nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
1284                                 src_ip,
1285                                 ntohs(ip->udp_dst),
1286                                 ntohs(ip->udp_src),
1287                                 ntohs(ip->udp_len) - UDP_HDR_SIZE);
1288 #endif
1289                 /*
1290                  * IP header OK.  Pass the packet to the current handler.
1291                  */
1292                 (*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE,
1293                                       ntohs(ip->udp_dst),
1294                                       src_ip,
1295                                       ntohs(ip->udp_src),
1296                                       ntohs(ip->udp_len) - UDP_HDR_SIZE);
1297                 break;
1298 #ifdef CONFIG_CMD_WOL
1299         case PROT_WOL:
1300                 wol_receive(ip, len);
1301                 break;
1302 #endif
1303         }
1304 }
1305
1306 /**********************************************************************/
1307
1308 static int net_check_prereq(enum proto_t protocol)
1309 {
1310         switch (protocol) {
1311                 /* Fall through */
1312 #if defined(CONFIG_CMD_PING)
1313         case PING:
1314                 if (net_ping_ip.s_addr == 0) {
1315                         puts("*** ERROR: ping address not given\n");
1316                         return 1;
1317                 }
1318                 goto common;
1319 #endif
1320 #if defined(CONFIG_CMD_SNTP)
1321         case SNTP:
1322                 if (net_ntp_server.s_addr == 0) {
1323                         puts("*** ERROR: NTP server address not given\n");
1324                         return 1;
1325                 }
1326                 goto common;
1327 #endif
1328 #if defined(CONFIG_CMD_DNS)
1329         case DNS:
1330                 if (net_dns_server.s_addr == 0) {
1331                         puts("*** ERROR: DNS server address not given\n");
1332                         return 1;
1333                 }
1334                 goto common;
1335 #endif
1336 #if defined(CONFIG_CMD_NFS)
1337         case NFS:
1338 #endif
1339                 /* Fall through */
1340         case TFTPGET:
1341         case TFTPPUT:
1342                 if (net_server_ip.s_addr == 0) {
1343                         puts("*** ERROR: `serverip' not set\n");
1344                         return 1;
1345                 }
1346 #if     defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
1347         defined(CONFIG_CMD_DNS)
1348 common:
1349 #endif
1350                 /* Fall through */
1351
1352         case NETCONS:
1353         case FASTBOOT:
1354         case TFTPSRV:
1355                 if (net_ip.s_addr == 0) {
1356                         puts("*** ERROR: `ipaddr' not set\n");
1357                         return 1;
1358                 }
1359                 /* Fall through */
1360
1361 #ifdef CONFIG_CMD_RARP
1362         case RARP:
1363 #endif
1364         case BOOTP:
1365         case CDP:
1366         case DHCP:
1367         case LINKLOCAL:
1368                 if (memcmp(net_ethaddr, "\0\0\0\0\0\0", 6) == 0) {
1369                         int num = eth_get_dev_index();
1370
1371                         switch (num) {
1372                         case -1:
1373                                 puts("*** ERROR: No ethernet found.\n");
1374                                 return 1;
1375                         case 0:
1376                                 puts("*** ERROR: `ethaddr' not set\n");
1377                                 break;
1378                         default:
1379                                 printf("*** ERROR: `eth%daddr' not set\n",
1380                                        num);
1381                                 break;
1382                         }
1383
1384                         net_start_again();
1385                         return 2;
1386                 }
1387                 /* Fall through */
1388         default:
1389                 return 0;
1390         }
1391         return 0;               /* OK */
1392 }
1393 /**********************************************************************/
1394
1395 int
1396 net_eth_hdr_size(void)
1397 {
1398         ushort myvlanid;
1399
1400         myvlanid = ntohs(net_our_vlan);
1401         if (myvlanid == (ushort)-1)
1402                 myvlanid = VLAN_NONE;
1403
1404         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1405                 VLAN_ETHER_HDR_SIZE;
1406 }
1407
1408 int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot)
1409 {
1410         struct ethernet_hdr *et = (struct ethernet_hdr *)xet;
1411         ushort myvlanid;
1412
1413         myvlanid = ntohs(net_our_vlan);
1414         if (myvlanid == (ushort)-1)
1415                 myvlanid = VLAN_NONE;
1416
1417         memcpy(et->et_dest, dest_ethaddr, 6);
1418         memcpy(et->et_src, net_ethaddr, 6);
1419         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1420                 et->et_protlen = htons(prot);
1421                 return ETHER_HDR_SIZE;
1422         } else {
1423                 struct vlan_ethernet_hdr *vet =
1424                         (struct vlan_ethernet_hdr *)xet;
1425
1426                 vet->vet_vlan_type = htons(PROT_VLAN);
1427                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1428                 vet->vet_type = htons(prot);
1429                 return VLAN_ETHER_HDR_SIZE;
1430         }
1431 }
1432
1433 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
1434 {
1435         ushort protlen;
1436
1437         memcpy(et->et_dest, addr, 6);
1438         memcpy(et->et_src, net_ethaddr, 6);
1439         protlen = ntohs(et->et_protlen);
1440         if (protlen == PROT_VLAN) {
1441                 struct vlan_ethernet_hdr *vet =
1442                         (struct vlan_ethernet_hdr *)et;
1443                 vet->vet_type = htons(prot);
1444                 return VLAN_ETHER_HDR_SIZE;
1445         } else if (protlen > 1514) {
1446                 et->et_protlen = htons(prot);
1447                 return ETHER_HDR_SIZE;
1448         } else {
1449                 /* 802.2 + SNAP */
1450                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1451                 et802->et_prot = htons(prot);
1452                 return E802_HDR_SIZE;
1453         }
1454 }
1455
1456 void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source)
1457 {
1458         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1459
1460         /*
1461          *      Construct an IP header.
1462          */
1463         /* IP_HDR_SIZE / 4 (not including UDP) */
1464         ip->ip_hl_v  = 0x45;
1465         ip->ip_tos   = 0;
1466         ip->ip_len   = htons(IP_HDR_SIZE);
1467         ip->ip_id    = htons(net_ip_id++);
1468         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1469         ip->ip_ttl   = 255;
1470         ip->ip_sum   = 0;
1471         /* already in network byte order */
1472         net_copy_ip((void *)&ip->ip_src, &source);
1473         /* already in network byte order */
1474         net_copy_ip((void *)&ip->ip_dst, &dest);
1475 }
1476
1477 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport,
1478                         int len)
1479 {
1480         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1481
1482         /*
1483          *      If the data is an odd number of bytes, zero the
1484          *      byte after the last byte so that the checksum
1485          *      will work.
1486          */
1487         if (len & 1)
1488                 pkt[IP_UDP_HDR_SIZE + len] = 0;
1489
1490         net_set_ip_header(pkt, dest, net_ip);
1491         ip->ip_len   = htons(IP_UDP_HDR_SIZE + len);
1492         ip->ip_p     = IPPROTO_UDP;
1493         ip->ip_sum   = compute_ip_checksum(ip, IP_HDR_SIZE);
1494
1495         ip->udp_src  = htons(sport);
1496         ip->udp_dst  = htons(dport);
1497         ip->udp_len  = htons(UDP_HDR_SIZE + len);
1498         ip->udp_xsum = 0;
1499 }
1500
1501 void copy_filename(char *dst, const char *src, int size)
1502 {
1503         if (*src && (*src == '"')) {
1504                 ++src;
1505                 --size;
1506         }
1507
1508         while ((--size > 0) && *src && (*src != '"'))
1509                 *dst++ = *src++;
1510         *dst = '\0';
1511 }
1512
1513 #if     defined(CONFIG_CMD_NFS)         || \
1514         defined(CONFIG_CMD_SNTP)        || \
1515         defined(CONFIG_CMD_DNS)
1516 /*
1517  * make port a little random (1024-17407)
1518  * This keeps the math somewhat trivial to compute, and seems to work with
1519  * all supported protocols/clients/servers
1520  */
1521 unsigned int random_port(void)
1522 {
1523         return 1024 + (get_timer(0) % 0x4000);
1524 }
1525 #endif
1526
1527 void ip_to_string(struct in_addr x, char *s)
1528 {
1529         x.s_addr = ntohl(x.s_addr);
1530         sprintf(s, "%d.%d.%d.%d",
1531                 (int) ((x.s_addr >> 24) & 0xff),
1532                 (int) ((x.s_addr >> 16) & 0xff),
1533                 (int) ((x.s_addr >> 8) & 0xff),
1534                 (int) ((x.s_addr >> 0) & 0xff)
1535         );
1536 }
1537
1538 void vlan_to_string(ushort x, char *s)
1539 {
1540         x = ntohs(x);
1541
1542         if (x == (ushort)-1)
1543                 x = VLAN_NONE;
1544
1545         if (x == VLAN_NONE)
1546                 strcpy(s, "none");
1547         else
1548                 sprintf(s, "%d", x & VLAN_IDMASK);
1549 }
1550
1551 ushort string_to_vlan(const char *s)
1552 {
1553         ushort id;
1554
1555         if (s == NULL)
1556                 return htons(VLAN_NONE);
1557
1558         if (*s < '0' || *s > '9')
1559                 id = VLAN_NONE;
1560         else
1561                 id = (ushort)simple_strtoul(s, NULL, 10);
1562
1563         return htons(id);
1564 }
1565
1566 ushort env_get_vlan(char *var)
1567 {
1568         return string_to_vlan(env_get(var));
1569 }