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 <bootstage.h>
  92 #include <command.h>
  93 #include <console.h>
  94 #include <env.h>
  95 #include <env_internal.h>
  96 #include <errno.h>
  97 #include <image.h>
  98 #include <log.h>
  99 #include <net.h>
 100 #include <net/fastboot.h>
 101 #include <net/tftp.h>
 102 #if defined(CONFIG_CMD_PCAP)
 103 #include <net/pcap.h>
 104 #endif
 105 #if defined(CONFIG_LED_STATUS)
 106 #include <miiphy.h>
 107 #include <status_led.h>
 108 #endif
 109 #include <watchdog.h>
 110 #include <linux/compiler.h>
 111 #include "arp.h"
 112 #include "bootp.h"
 113 #include "cdp.h"
 114 #if defined(CONFIG_CMD_DNS)
 115 #include "dns.h"
 116 #endif
 117 #include "link_local.h"
 118 #include "nfs.h"
 119 #include "ping.h"
 120 #include "rarp.h"
 121 #if defined(CONFIG_CMD_SNTP)
 122 #include "sntp.h"
 123 #endif
 124 #if defined(CONFIG_CMD_WOL)
 125 #include "wol.h"
 126 #endif
 127
 128 /** BOOTP EXTENTIONS **/
 129
 130 /* Our subnet mask (0=unknown) */
 131 struct in_addr net_netmask;
 132 /* Our gateways IP address */
 133 struct in_addr net_gateway;
 134 /* Our DNS IP address */
 135 struct in_addr net_dns_server;
 136 #if defined(CONFIG_BOOTP_DNS2)
 137 /* Our 2nd DNS IP address */
 138 struct in_addr net_dns_server2;
 139 #endif
 140
 141 /** END OF BOOTP EXTENTIONS **/
 142
 143 /* Our ethernet address */
 144 u8 net_ethaddr[6];
 145 /* Boot server enet address */
 146 u8 net_server_ethaddr[6];
 147 /* Our IP addr (0 = unknown) */
 148 struct in_addr  net_ip;
 149 /* Server IP addr (0 = unknown) */
 150 struct in_addr  net_server_ip;
 151 /* Current receive packet */
 152 uchar *net_rx_packet;
 153 /* Current rx packet length */
 154 int             net_rx_packet_len;
 155 /* IP packet ID */
 156 static unsigned net_ip_id;
 157 /* Ethernet bcast address */
 158 const u8 net_bcast_ethaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 159 const u8 net_null_ethaddr[6];
 160 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
 161 void (*push_packet)(void *, int len) = 0;
 162 #endif
 163 /* Network loop state */
 164 enum net_loop_state net_state;
 165 /* Tried all network devices */
 166 int             net_restart_wrap;
 167 /* Network loop restarted */
 168 static int      net_restarted;
 169 /* At least one device configured */
 170 static int      net_dev_exists;
 171
 172 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
 173 /* default is without VLAN */
 174 ushort          net_our_vlan = 0xFFFF;
 175 /* ditto */
 176 ushort          net_native_vlan = 0xFFFF;
 177
 178 /* Boot File name */
 179 char net_boot_file_name[1024];
 180 /* Indicates whether the file name was specified on the command line */
 181 bool net_boot_file_name_explicit;
 182 /* The actual transferred size of the bootfile (in bytes) */
 183 u32 net_boot_file_size;
 184 /* Boot file size in blocks as reported by the DHCP server */
 185 u32 net_boot_file_expected_size_in_blocks;
 186
 187 #if defined(CONFIG_CMD_SNTP)
 188 /* NTP server IP address */
 189 struct in_addr  net_ntp_server;
 190 /* offset time from UTC */
 191 int             net_ntp_time_offset;
 192 #endif
 193
 194 static uchar net_pkt_buf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 195 /* Receive packets */
 196 uchar *net_rx_packets[PKTBUFSRX];
 197 /* Current UDP RX packet handler */
 198 static rxhand_f *udp_packet_handler;
 199 /* Current ARP RX packet handler */
 200 static rxhand_f *arp_packet_handler;
 201 #ifdef CONFIG_CMD_TFTPPUT
 202 /* Current ICMP rx handler */
 203 static rxhand_icmp_f *packet_icmp_handler;
 204 #endif
 205 /* Current timeout handler */
 206 static thand_f *time_handler;
 207 /* Time base value */
 208 static ulong    time_start;
 209 /* Current timeout value */
 210 static ulong    time_delta;
 211 /* THE transmit packet */
 212 uchar *net_tx_packet;
 213
 214 static int net_check_prereq(enum proto_t protocol);
 215
 216 static int net_try_count;
 217
 218 int __maybe_unused net_busy_flag;
 219
 220 /**********************************************************************/
 221
 222 static int on_ipaddr(const char *name, const char *value, enum env_op op,
 223         int flags)
 224 {
 225         if (flags & H_PROGRAMMATIC)
 226                 return 0;
 227
 228         net_ip = string_to_ip(value);
 229
 230         return 0;
 231 }
 232 U_BOOT_ENV_CALLBACK(ipaddr, on_ipaddr);
 233
 234 static int on_gatewayip(const char *name, const char *value, enum env_op op,
 235         int flags)
 236 {
 237         if (flags & H_PROGRAMMATIC)
 238                 return 0;
 239
 240         net_gateway = string_to_ip(value);
 241
 242         return 0;
 243 }
 244 U_BOOT_ENV_CALLBACK(gatewayip, on_gatewayip);
 245
 246 static int on_netmask(const char *name, const char *value, enum env_op op,
 247         int flags)
 248 {
 249         if (flags & H_PROGRAMMATIC)
 250                 return 0;
 251
 252         net_netmask = string_to_ip(value);
 253
 254         return 0;
 255 }
 256 U_BOOT_ENV_CALLBACK(netmask, on_netmask);
 257
 258 static int on_serverip(const char *name, const char *value, enum env_op op,
 259         int flags)
 260 {
 261         if (flags & H_PROGRAMMATIC)
 262                 return 0;
 263
 264         net_server_ip = string_to_ip(value);
 265
 266         return 0;
 267 }
 268 U_BOOT_ENV_CALLBACK(serverip, on_serverip);
 269
 270 static int on_nvlan(const char *name, const char *value, enum env_op op,
 271         int flags)
 272 {
 273         if (flags & H_PROGRAMMATIC)
 274                 return 0;
 275
 276         net_native_vlan = string_to_vlan(value);
 277
 278         return 0;
 279 }
 280 U_BOOT_ENV_CALLBACK(nvlan, on_nvlan);
 281
 282 static int on_vlan(const char *name, const char *value, enum env_op op,
 283         int flags)
 284 {
 285         if (flags & H_PROGRAMMATIC)
 286                 return 0;
 287
 288         net_our_vlan = string_to_vlan(value);
 289
 290         return 0;
 291 }
 292 U_BOOT_ENV_CALLBACK(vlan, on_vlan);
 293
 294 #if defined(CONFIG_CMD_DNS)
 295 static int on_dnsip(const char *name, const char *value, enum env_op op,
 296         int flags)
 297 {
 298         if (flags & H_PROGRAMMATIC)
 299                 return 0;
 300
 301         net_dns_server = string_to_ip(value);
 302
 303         return 0;
 304 }
 305 U_BOOT_ENV_CALLBACK(dnsip, on_dnsip);
 306 #endif
 307
 308 /*
 309  * Check if autoload is enabled. If so, use either NFS or TFTP to download
 310  * the boot file.
 311  */
 312 void net_auto_load(void)
 313 {
 314 #if defined(CONFIG_CMD_NFS) && !defined(CONFIG_SPL_BUILD)
 315         const char *s = env_get("autoload");
 316
 317         if (s != NULL && strcmp(s, "NFS") == 0) {
 318                 if (net_check_prereq(NFS)) {
 319 /* We aren't expecting to get a serverip, so just accept the assigned IP */
 320 #ifdef CONFIG_BOOTP_SERVERIP
 321                         net_set_state(NETLOOP_SUCCESS);
 322 #else
 323                         printf("Cannot autoload with NFS\n");
 324                         net_set_state(NETLOOP_FAIL);
 325 #endif
 326                         return;
 327                 }
 328                 /*
 329                  * Use NFS to load the bootfile.
 330                  */
 331                 nfs_start();
 332                 return;
 333         }
 334 #endif
 335         if (env_get_yesno("autoload") == 0) {
 336                 /*
 337                  * Just use BOOTP/RARP to configure system;
 338                  * Do not use TFTP to load the bootfile.
 339                  */
 340                 net_set_state(NETLOOP_SUCCESS);
 341                 return;
 342         }
 343         if (net_check_prereq(TFTPGET)) {
 344 /* We aren't expecting to get a serverip, so just accept the assigned IP */
 345 #ifdef CONFIG_BOOTP_SERVERIP
 346                 net_set_state(NETLOOP_SUCCESS);
 347 #else
 348                 printf("Cannot autoload with TFTPGET\n");
 349                 net_set_state(NETLOOP_FAIL);
 350 #endif
 351                 return;
 352         }
 353         tftp_start(TFTPGET);
 354 }
 355
 356 static void net_init_loop(void)
 357 {
 358         if (eth_get_dev())
 359                 memcpy(net_ethaddr, eth_get_ethaddr(), 6);
 360
 361         return;
 362 }
 363
 364 static void net_clear_handlers(void)
 365 {
 366         net_set_udp_handler(NULL);
 367         net_set_arp_handler(NULL);
 368         net_set_timeout_handler(0, NULL);
 369 }
 370
 371 static void net_cleanup_loop(void)
 372 {
 373         net_clear_handlers();
 374 }
 375
 376 void net_init(void)
 377 {
 378         static int first_call = 1;
 379
 380         if (first_call) {
 381                 /*
 382                  *      Setup packet buffers, aligned correctly.
 383                  */
 384                 int i;
 385
 386                 net_tx_packet = &net_pkt_buf[0] + (PKTALIGN - 1);
 387                 net_tx_packet -= (ulong)net_tx_packet % PKTALIGN;
 388                 for (i = 0; i < PKTBUFSRX; i++) {
 389                         net_rx_packets[i] = net_tx_packet +
 390                                 (i + 1) * PKTSIZE_ALIGN;
 391                 }
 392                 arp_init();
 393                 net_clear_handlers();
 394
 395                 /* Only need to setup buffer pointers once. */
 396                 first_call = 0;
 397         }
 398
 399         net_init_loop();
 400 }
 401
 402 /**********************************************************************/
 403 /*
 404  *      Main network processing loop.
 405  */
 406
 407 int net_loop(enum proto_t protocol)
 408 {
 409         int ret = -EINVAL;
 410         enum net_loop_state prev_net_state = net_state;
 411
 412 #if defined(CONFIG_CMD_PING)
 413         if (protocol != PING)
 414                 net_ping_ip.s_addr = 0;
 415 #endif
 416         net_restarted = 0;
 417         net_dev_exists = 0;
 418         net_try_count = 1;
 419         debug_cond(DEBUG_INT_STATE, "--- net_loop Entry\n");
 420
 421         bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
 422         net_init();
 423         if (eth_is_on_demand_init() || protocol != NETCONS) {
 424                 eth_halt();
 425                 eth_set_current();
 426                 ret = eth_init();
 427                 if (ret < 0) {
 428                         eth_halt();
 429                         return ret;
 430                 }
 431         } else {
 432                 eth_init_state_only();
 433         }
 434 restart:
 435 #ifdef CONFIG_USB_KEYBOARD
 436         net_busy_flag = 0;
 437 #endif
 438         net_set_state(NETLOOP_CONTINUE);
 439
 440         /*
 441          *      Start the ball rolling with the given start function.  From
 442          *      here on, this code is a state machine driven by received
 443          *      packets and timer events.
 444          */
 445         debug_cond(DEBUG_INT_STATE, "--- net_loop Init\n");
 446         net_init_loop();
 447
 448         switch (net_check_prereq(protocol)) {
 449         case 1:
 450                 /* network not configured */
 451                 eth_halt();
 452                 net_set_state(prev_net_state);
 453                 return -ENODEV;
 454
 455         case 2:
 456                 /* network device not configured */
 457                 break;
 458
 459         case 0:
 460                 net_dev_exists = 1;
 461                 net_boot_file_size = 0;
 462                 switch (protocol) {
 463 #ifdef CONFIG_CMD_TFTPBOOT
 464                 case TFTPGET:
 465 #ifdef CONFIG_CMD_TFTPPUT
 466                 case TFTPPUT:
 467 #endif
 468                         /* always use ARP to get server ethernet address */
 469                         tftp_start(protocol);
 470                         break;
 471 #endif
 472 #ifdef CONFIG_CMD_TFTPSRV
 473                 case TFTPSRV:
 474                         tftp_start_server();
 475                         break;
 476 #endif
 477 #ifdef CONFIG_UDP_FUNCTION_FASTBOOT
 478                 case FASTBOOT:
 479                         fastboot_start_server();
 480                         break;
 481 #endif
 482 #if defined(CONFIG_CMD_DHCP)
 483                 case DHCP:
 484                         bootp_reset();
 485                         net_ip.s_addr = 0;
 486                         dhcp_request();         /* Basically same as BOOTP */
 487                         break;
 488 #endif
 489 #if defined(CONFIG_CMD_BOOTP)
 490                 case BOOTP:
 491                         bootp_reset();
 492                         net_ip.s_addr = 0;
 493                         bootp_request();
 494                         break;
 495 #endif
 496 #if defined(CONFIG_CMD_RARP)
 497                 case RARP:
 498                         rarp_try = 0;
 499                         net_ip.s_addr = 0;
 500                         rarp_request();
 501                         break;
 502 #endif
 503 #if defined(CONFIG_CMD_PING)
 504                 case PING:
 505                         ping_start();
 506                         break;
 507 #endif
 508 #if defined(CONFIG_CMD_NFS) && !defined(CONFIG_SPL_BUILD)
 509                 case NFS:
 510                         nfs_start();
 511                         break;
 512 #endif
 513 #if defined(CONFIG_CMD_CDP)
 514                 case CDP:
 515                         cdp_start();
 516                         break;
 517 #endif
 518 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
 519                 case NETCONS:
 520                         nc_start();
 521                         break;
 522 #endif
 523 #if defined(CONFIG_CMD_SNTP)
 524                 case SNTP:
 525                         sntp_start();
 526                         break;
 527 #endif
 528 #if defined(CONFIG_CMD_DNS)
 529                 case DNS:
 530                         dns_start();
 531                         break;
 532 #endif
 533 #if defined(CONFIG_CMD_LINK_LOCAL)
 534                 case LINKLOCAL:
 535                         link_local_start();
 536                         break;
 537 #endif
 538 #if defined(CONFIG_CMD_WOL)
 539                 case WOL:
 540                         wol_start();
 541                         break;
 542 #endif
 543                 default:
 544                         break;
 545                 }
 546
 547                 break;
 548         }
 549
 550 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 551 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 552         defined(CONFIG_LED_STATUS)                      && \
 553         defined(CONFIG_LED_STATUS_RED)
 554         /*
 555          * Echo the inverted link state to the fault LED.
 556          */
 557         if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
 558                 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_OFF);
 559         else
 560                 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_ON);
 561 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 562 #endif /* CONFIG_MII, ... */
 563 #ifdef CONFIG_USB_KEYBOARD
 564         net_busy_flag = 1;
 565 #endif
 566
 567         /*
 568          *      Main packet reception loop.  Loop receiving packets until
 569          *      someone sets `net_state' to a state that terminates.
 570          */
 571         for (;;) {
 572                 WATCHDOG_RESET();
 573                 if (arp_timeout_check() > 0)
 574                         time_start = get_timer(0);
 575
 576                 /*
 577                  *      Check the ethernet for a new packet.  The ethernet
 578                  *      receive routine will process it.
 579                  *      Most drivers return the most recent packet size, but not
 580                  *      errors that may have happened.
 581                  */
 582                 eth_rx();
 583
 584                 /*
 585                  *      Abort if ctrl-c was pressed.
 586                  */
 587                 if (ctrlc()) {
 588                         /* cancel any ARP that may not have completed */
 589                         net_arp_wait_packet_ip.s_addr = 0;
 590
 591                         net_cleanup_loop();
 592                         eth_halt();
 593                         /* Invalidate the last protocol */
 594                         eth_set_last_protocol(BOOTP);
 595
 596                         puts("\nAbort\n");
 597                         /* include a debug print as well incase the debug
 598                            messages are directed to stderr */
 599                         debug_cond(DEBUG_INT_STATE, "--- net_loop Abort!\n");
 600                         ret = -EINTR;
 601                         goto done;
 602                 }
 603
 604                 /*
 605                  *      Check for a timeout, and run the timeout handler
 606                  *      if we have one.
 607                  */
 608                 if (time_handler &&
 609                     ((get_timer(0) - time_start) > time_delta)) {
 610                         thand_f *x;
 611
 612 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 613 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 614         defined(CONFIG_LED_STATUS)                      && \
 615         defined(CONFIG_LED_STATUS_RED)
 616                         /*
 617                          * Echo the inverted link state to the fault LED.
 618                          */
 619                         if (miiphy_link(eth_get_dev()->name,
 620                                         CONFIG_SYS_FAULT_MII_ADDR))
 621                                 status_led_set(CONFIG_LED_STATUS_RED,
 622                                                CONFIG_LED_STATUS_OFF);
 623                         else
 624                                 status_led_set(CONFIG_LED_STATUS_RED,
 625                                                CONFIG_LED_STATUS_ON);
 626 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 627 #endif /* CONFIG_MII, ... */
 628                         debug_cond(DEBUG_INT_STATE, "--- net_loop timeout\n");
 629                         x = time_handler;
 630                         time_handler = (thand_f *)0;
 631                         (*x)();
 632                 }
 633
 634                 if (net_state == NETLOOP_FAIL)
 635                         ret = net_start_again();
 636
 637                 switch (net_state) {
 638                 case NETLOOP_RESTART:
 639                         net_restarted = 1;
 640                         goto restart;
 641
 642                 case NETLOOP_SUCCESS:
 643                         net_cleanup_loop();
 644                         if (net_boot_file_size > 0) {
 645                                 printf("Bytes transferred = %d (%x hex)\n",
 646                                        net_boot_file_size, net_boot_file_size);
 647                                 env_set_hex("filesize", net_boot_file_size);
 648                                 env_set_hex("fileaddr", image_load_addr);
 649                         }
 650                         if (protocol != NETCONS)
 651                                 eth_halt();
 652                         else
 653                                 eth_halt_state_only();
 654
 655                         eth_set_last_protocol(protocol);
 656
 657                         ret = net_boot_file_size;
 658                         debug_cond(DEBUG_INT_STATE, "--- net_loop Success!\n");
 659                         goto done;
 660
 661                 case NETLOOP_FAIL:
 662                         net_cleanup_loop();
 663                         /* Invalidate the last protocol */
 664                         eth_set_last_protocol(BOOTP);
 665                         debug_cond(DEBUG_INT_STATE, "--- net_loop Fail!\n");
 666                         ret = -ENONET;
 667                         goto done;
 668
 669                 case NETLOOP_CONTINUE:
 670                         continue;
 671                 }
 672         }
 673
 674 done:
 675 #ifdef CONFIG_USB_KEYBOARD
 676         net_busy_flag = 0;
 677 #endif
 678 #ifdef CONFIG_CMD_TFTPPUT
 679         /* Clear out the handlers */
 680         net_set_udp_handler(NULL);
 681         net_set_icmp_handler(NULL);
 682 #endif
 683         net_set_state(prev_net_state);
 684
 685 #if defined(CONFIG_CMD_PCAP)
 686         if (pcap_active())
 687                 pcap_print_status();
 688 #endif
 689         return ret;
 690 }
 691
 692 /**********************************************************************/
 693
 694 static void start_again_timeout_handler(void)
 695 {
 696         net_set_state(NETLOOP_RESTART);
 697 }
 698
 699 int net_start_again(void)
 700 {
 701         char *nretry;
 702         int retry_forever = 0;
 703         unsigned long retrycnt = 0;
 704         int ret;
 705
 706         nretry = env_get("netretry");
 707         if (nretry) {
 708                 if (!strcmp(nretry, "yes"))
 709                         retry_forever = 1;
 710                 else if (!strcmp(nretry, "no"))
 711                         retrycnt = 0;
 712                 else if (!strcmp(nretry, "once"))
 713                         retrycnt = 1;
 714                 else
 715                         retrycnt = simple_strtoul(nretry, NULL, 0);
 716         } else {
 717                 retrycnt = 0;
 718                 retry_forever = 0;
 719         }
 720
 721         if ((!retry_forever) && (net_try_count > retrycnt)) {
 722                 eth_halt();
 723                 net_set_state(NETLOOP_FAIL);
 724                 /*
 725                  * We don't provide a way for the protocol to return an error,
 726                  * but this is almost always the reason.
 727                  */
 728                 return -ETIMEDOUT;
 729         }
 730
 731         net_try_count++;
 732
 733         eth_halt();
 734 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
 735         eth_try_another(!net_restarted);
 736 #endif
 737         ret = eth_init();
 738         if (net_restart_wrap) {
 739                 net_restart_wrap = 0;
 740                 if (net_dev_exists) {
 741                         net_set_timeout_handler(10000UL,
 742                                                 start_again_timeout_handler);
 743                         net_set_udp_handler(NULL);
 744                 } else {
 745                         net_set_state(NETLOOP_FAIL);
 746                 }
 747         } else {
 748                 net_set_state(NETLOOP_RESTART);
 749         }
 750         return ret;
 751 }
 752
 753 /**********************************************************************/
 754 /*
 755  *      Miscelaneous bits.
 756  */
 757
 758 static void dummy_handler(uchar *pkt, unsigned dport,
 759                         struct in_addr sip, unsigned sport,
 760                         unsigned len)
 761 {
 762 }
 763
 764 rxhand_f *net_get_udp_handler(void)
 765 {
 766         return udp_packet_handler;
 767 }
 768
 769 void net_set_udp_handler(rxhand_f *f)
 770 {
 771         debug_cond(DEBUG_INT_STATE, "--- net_loop UDP handler set (%p)\n", f);
 772         if (f == NULL)
 773                 udp_packet_handler = dummy_handler;
 774         else
 775                 udp_packet_handler = f;
 776 }
 777
 778 rxhand_f *net_get_arp_handler(void)
 779 {
 780         return arp_packet_handler;
 781 }
 782
 783 void net_set_arp_handler(rxhand_f *f)
 784 {
 785         debug_cond(DEBUG_INT_STATE, "--- net_loop ARP handler set (%p)\n", f);
 786         if (f == NULL)
 787                 arp_packet_handler = dummy_handler;
 788         else
 789                 arp_packet_handler = f;
 790 }
 791
 792 #ifdef CONFIG_CMD_TFTPPUT
 793 void net_set_icmp_handler(rxhand_icmp_f *f)
 794 {
 795         packet_icmp_handler = f;
 796 }
 797 #endif
 798
 799 void net_set_timeout_handler(ulong iv, thand_f *f)
 800 {
 801         if (iv == 0) {
 802                 debug_cond(DEBUG_INT_STATE,
 803                            "--- net_loop timeout handler cancelled\n");
 804                 time_handler = (thand_f *)0;
 805         } else {
 806                 debug_cond(DEBUG_INT_STATE,
 807                            "--- net_loop timeout handler set (%p)\n", f);
 808                 time_handler = f;
 809                 time_start = get_timer(0);
 810                 time_delta = iv * CONFIG_SYS_HZ / 1000;
 811         }
 812 }
 813
 814 uchar *net_get_async_tx_pkt_buf(void)
 815 {
 816         if (arp_is_waiting())
 817                 return arp_tx_packet; /* If we are waiting, we already sent */
 818         else
 819                 return net_tx_packet;
 820 }
 821
 822 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
 823                 int payload_len)
 824 {
 825         return net_send_ip_packet(ether, dest, dport, sport, payload_len,
 826                                   IPPROTO_UDP, 0, 0, 0);
 827 }
 828
 829 int net_send_ip_packet(uchar *ether, struct in_addr dest, int dport, int sport,
 830                        int payload_len, int proto, u8 action, u32 tcp_seq_num,
 831                        u32 tcp_ack_num)
 832 {
 833         uchar *pkt;
 834         int eth_hdr_size;
 835         int pkt_hdr_size;
 836
 837         /* make sure the net_tx_packet is initialized (net_init() was called) */
 838         assert(net_tx_packet != NULL);
 839         if (net_tx_packet == NULL)
 840                 return -1;
 841
 842         /* convert to new style broadcast */
 843         if (dest.s_addr == 0)
 844                 dest.s_addr = 0xFFFFFFFF;
 845
 846         /* if broadcast, make the ether address a broadcast and don't do ARP */
 847         if (dest.s_addr == 0xFFFFFFFF)
 848                 ether = (uchar *)net_bcast_ethaddr;
 849
 850         pkt = (uchar *)net_tx_packet;
 851
 852         eth_hdr_size = net_set_ether(pkt, ether, PROT_IP);
 853
 854         switch (proto) {
 855         case IPPROTO_UDP:
 856                 net_set_udp_header(pkt + eth_hdr_size, dest, dport, sport,
 857                                    payload_len);
 858                 pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
 859                 break;
 860         default:
 861                 return -EINVAL;
 862         }
 863
 864         /* if MAC address was not discovered yet, do an ARP request */
 865         if (memcmp(ether, net_null_ethaddr, 6) == 0) {
 866                 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest);
 867
 868                 /* save the ip and eth addr for the packet to send after arp */
 869                 net_arp_wait_packet_ip = dest;
 870                 arp_wait_packet_ethaddr = ether;
 871
 872                 /* size of the waiting packet */
 873                 arp_wait_tx_packet_size = pkt_hdr_size + payload_len;
 874
 875                 /* and do the ARP request */
 876                 arp_wait_try = 1;
 877                 arp_wait_timer_start = get_timer(0);
 878                 arp_request();
 879                 return 1;       /* waiting */
 880         } else {
 881                 debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
 882                            &dest, ether);
 883                 net_send_packet(net_tx_packet, pkt_hdr_size + payload_len);
 884                 return 0;       /* transmitted */
 885         }
 886 }
 887
 888 #ifdef CONFIG_IP_DEFRAG
 889 /*
 890  * This function collects fragments in a single packet, according
 891  * to the algorithm in RFC815. It returns NULL or the pointer to
 892  * a complete packet, in static storage
 893  */
 894 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG)
 895
 896 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE)
 897
 898 /*
 899  * this is the packet being assembled, either data or frag control.
 900  * Fragments go by 8 bytes, so this union must be 8 bytes long
 901  */
 902 struct hole {
 903         /* first_byte is address of this structure */
 904         u16 last_byte;  /* last byte in this hole + 1 (begin of next hole) */
 905         u16 next_hole;  /* index of next (in 8-b blocks), 0 == none */
 906         u16 prev_hole;  /* index of prev, 0 == none */
 907         u16 unused;
 908 };
 909
 910 static struct ip_udp_hdr *__net_defragment(struct ip_udp_hdr *ip, int *lenp)
 911 {
 912         static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
 913         static u16 first_hole, total_len;
 914         struct hole *payload, *thisfrag, *h, *newh;
 915         struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff;
 916         uchar *indata = (uchar *)ip;
 917         int offset8, start, len, done = 0;
 918         u16 ip_off = ntohs(ip->ip_off);
 919
 920         /* payload starts after IP header, this fragment is in there */
 921         payload = (struct hole *)(pkt_buff + IP_HDR_SIZE);
 922         offset8 =  (ip_off & IP_OFFS);
 923         thisfrag = payload + offset8;
 924         start = offset8 * 8;
 925         len = ntohs(ip->ip_len) - IP_HDR_SIZE;
 926
 927         if (start + len > IP_MAXUDP) /* fragment extends too far */
 928                 return NULL;
 929
 930         if (!total_len || localip->ip_id != ip->ip_id) {
 931                 /* new (or different) packet, reset structs */
 932                 total_len = 0xffff;
 933                 payload[0].last_byte = ~0;
 934                 payload[0].next_hole = 0;
 935                 payload[0].prev_hole = 0;
 936                 first_hole = 0;
 937                 /* any IP header will work, copy the first we received */
 938                 memcpy(localip, ip, IP_HDR_SIZE);
 939         }
 940
 941         /*
 942          * What follows is the reassembly algorithm. We use the payload
 943          * array as a linked list of hole descriptors, as each hole starts
 944          * at a multiple of 8 bytes. However, last byte can be whatever value,
 945          * so it is represented as byte count, not as 8-byte blocks.
 946          */
 947
 948         h = payload + first_hole;
 949         while (h->last_byte < start) {
 950                 if (!h->next_hole) {
 951                         /* no hole that far away */
 952                         return NULL;
 953                 }
 954                 h = payload + h->next_hole;
 955         }
 956
 957         /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
 958         if (offset8 + ((len + 7) / 8) <= h - payload) {
 959                 /* no overlap with holes (dup fragment?) */
 960                 return NULL;
 961         }
 962
 963         if (!(ip_off & IP_FLAGS_MFRAG)) {
 964                 /* no more fragmentss: truncate this (last) hole */
 965                 total_len = start + len;
 966                 h->last_byte = start + len;
 967         }
 968
 969         /*
 970          * There is some overlap: fix the hole list. This code doesn't
 971          * deal with a fragment that overlaps with two different holes
 972          * (thus being a superset of a previously-received fragment).
 973          */
 974
 975         if ((h >= thisfrag) && (h->last_byte <= start + len)) {
 976                 /* complete overlap with hole: remove hole */
 977                 if (!h->prev_hole && !h->next_hole) {
 978                         /* last remaining hole */
 979                         done = 1;
 980                 } else if (!h->prev_hole) {
 981                         /* first hole */
 982                         first_hole = h->next_hole;
 983                         payload[h->next_hole].prev_hole = 0;
 984                 } else if (!h->next_hole) {
 985                         /* last hole */
 986                         payload[h->prev_hole].next_hole = 0;
 987                 } else {
 988                         /* in the middle of the list */
 989                         payload[h->next_hole].prev_hole = h->prev_hole;
 990                         payload[h->prev_hole].next_hole = h->next_hole;
 991                 }
 992
 993         } else if (h->last_byte <= start + len) {
 994                 /* overlaps with final part of the hole: shorten this hole */
 995                 h->last_byte = start;
 996
 997         } else if (h >= thisfrag) {
 998                 /* overlaps with initial part of the hole: move this hole */
 999                 newh = thisfrag + (len / 8);
1000                 *newh = *h;
1001                 h = newh;
1002                 if (h->next_hole)
1003                         payload[h->next_hole].prev_hole = (h - payload);
1004                 if (h->prev_hole)
1005                         payload[h->prev_hole].next_hole = (h - payload);
1006                 else
1007                         first_hole = (h - payload);
1008
1009         } else {
1010                 /* fragment sits in the middle: split the hole */
1011                 newh = thisfrag + (len / 8);
1012                 *newh = *h;
1013                 h->last_byte = start;
1014                 h->next_hole = (newh - payload);
1015                 newh->prev_hole = (h - payload);
1016                 if (newh->next_hole)
1017                         payload[newh->next_hole].prev_hole = (newh - payload);
1018         }
1019
1020         /* finally copy this fragment and possibly return whole packet */
1021         memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len);
1022         if (!done)
1023                 return NULL;
1024
1025         localip->ip_len = htons(total_len);
1026         *lenp = total_len + IP_HDR_SIZE;
1027         return localip;
1028 }
1029
1030 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
1031         int *lenp)
1032 {
1033         u16 ip_off = ntohs(ip->ip_off);
1034         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1035                 return ip; /* not a fragment */
1036         return __net_defragment(ip, lenp);
1037 }
1038
1039 #else /* !CONFIG_IP_DEFRAG */
1040
1041 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
1042         int *lenp)
1043 {
1044         u16 ip_off = ntohs(ip->ip_off);
1045         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1046                 return ip; /* not a fragment */
1047         return NULL;
1048 }
1049 #endif
1050
1051 /**
1052  * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
1053  * drop others.
1054  *
1055  * @parma ip    IP packet containing the ICMP
1056  */
1057 static void receive_icmp(struct ip_udp_hdr *ip, int len,
1058                         struct in_addr src_ip, struct ethernet_hdr *et)
1059 {
1060         struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
1061
1062         switch (icmph->type) {
1063         case ICMP_REDIRECT:
1064                 if (icmph->code != ICMP_REDIR_HOST)
1065                         return;
1066                 printf(" ICMP Host Redirect to %pI4 ",
1067                        &icmph->un.gateway);
1068                 break;
1069         default:
1070 #if defined(CONFIG_CMD_PING)
1071                 ping_receive(et, ip, len);
1072 #endif
1073 #ifdef CONFIG_CMD_TFTPPUT
1074                 if (packet_icmp_handler)
1075                         packet_icmp_handler(icmph->type, icmph->code,
1076                                             ntohs(ip->udp_dst), src_ip,
1077                                             ntohs(ip->udp_src), icmph->un.data,
1078                                             ntohs(ip->udp_len));
1079 #endif
1080                 break;
1081         }
1082 }
1083
1084 void net_process_received_packet(uchar *in_packet, int len)
1085 {
1086         struct ethernet_hdr *et;
1087         struct ip_udp_hdr *ip;
1088         struct in_addr dst_ip;
1089         struct in_addr src_ip;
1090         int eth_proto;
1091 #if defined(CONFIG_CMD_CDP)
1092         int iscdp;
1093 #endif
1094         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1095
1096         debug_cond(DEBUG_NET_PKT, "packet received\n");
1097
1098 #if defined(CONFIG_CMD_PCAP)
1099         pcap_post(in_packet, len, false);
1100 #endif
1101         net_rx_packet = in_packet;
1102         net_rx_packet_len = len;
1103         et = (struct ethernet_hdr *)in_packet;
1104
1105         /* too small packet? */
1106         if (len < ETHER_HDR_SIZE)
1107                 return;
1108
1109 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
1110         if (push_packet) {
1111                 (*push_packet)(in_packet, len);
1112                 return;
1113         }
1114 #endif
1115
1116 #if defined(CONFIG_CMD_CDP)
1117         /* keep track if packet is CDP */
1118         iscdp = is_cdp_packet(et->et_dest);
1119 #endif
1120
1121         myvlanid = ntohs(net_our_vlan);
1122         if (myvlanid == (ushort)-1)
1123                 myvlanid = VLAN_NONE;
1124         mynvlanid = ntohs(net_native_vlan);
1125         if (mynvlanid == (ushort)-1)
1126                 mynvlanid = VLAN_NONE;
1127
1128         eth_proto = ntohs(et->et_protlen);
1129
1130         if (eth_proto < 1514) {
1131                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1132                 /*
1133                  *      Got a 802.2 packet.  Check the other protocol field.
1134                  *      XXX VLAN over 802.2+SNAP not implemented!
1135                  */
1136                 eth_proto = ntohs(et802->et_prot);
1137
1138                 ip = (struct ip_udp_hdr *)(in_packet + E802_HDR_SIZE);
1139                 len -= E802_HDR_SIZE;
1140
1141         } else if (eth_proto != PROT_VLAN) {    /* normal packet */
1142                 ip = (struct ip_udp_hdr *)(in_packet + ETHER_HDR_SIZE);
1143                 len -= ETHER_HDR_SIZE;
1144
1145         } else {                        /* VLAN packet */
1146                 struct vlan_ethernet_hdr *vet =
1147                         (struct vlan_ethernet_hdr *)et;
1148
1149                 debug_cond(DEBUG_NET_PKT, "VLAN packet received\n");
1150
1151                 /* too small packet? */
1152                 if (len < VLAN_ETHER_HDR_SIZE)
1153                         return;
1154
1155                 /* if no VLAN active */
1156                 if ((ntohs(net_our_vlan) & VLAN_IDMASK) == VLAN_NONE
1157 #if defined(CONFIG_CMD_CDP)
1158                                 && iscdp == 0
1159 #endif
1160                                 )
1161                         return;
1162
1163                 cti = ntohs(vet->vet_tag);
1164                 vlanid = cti & VLAN_IDMASK;
1165                 eth_proto = ntohs(vet->vet_type);
1166
1167                 ip = (struct ip_udp_hdr *)(in_packet + VLAN_ETHER_HDR_SIZE);
1168                 len -= VLAN_ETHER_HDR_SIZE;
1169         }
1170
1171         debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto);
1172
1173 #if defined(CONFIG_CMD_CDP)
1174         if (iscdp) {
1175                 cdp_receive((uchar *)ip, len);
1176                 return;
1177         }
1178 #endif
1179
1180         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1181                 if (vlanid == VLAN_NONE)
1182                         vlanid = (mynvlanid & VLAN_IDMASK);
1183                 /* not matched? */
1184                 if (vlanid != (myvlanid & VLAN_IDMASK))
1185                         return;
1186         }
1187
1188         switch (eth_proto) {
1189         case PROT_ARP:
1190                 arp_receive(et, ip, len);
1191                 break;
1192
1193 #ifdef CONFIG_CMD_RARP
1194         case PROT_RARP:
1195                 rarp_receive(ip, len);
1196                 break;
1197 #endif
1198         case PROT_IP:
1199                 debug_cond(DEBUG_NET_PKT, "Got IP\n");
1200                 /* Before we start poking the header, make sure it is there */
1201                 if (len < IP_UDP_HDR_SIZE) {
1202                         debug("len bad %d < %lu\n", len,
1203                               (ulong)IP_UDP_HDR_SIZE);
1204                         return;
1205                 }
1206                 /* Check the packet length */
1207                 if (len < ntohs(ip->ip_len)) {
1208                         debug("len bad %d < %d\n", len, ntohs(ip->ip_len));
1209                         return;
1210                 }
1211                 len = ntohs(ip->ip_len);
1212                 debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n",
1213                            len, ip->ip_hl_v & 0xff);
1214
1215                 /* Can't deal with anything except IPv4 */
1216                 if ((ip->ip_hl_v & 0xf0) != 0x40)
1217                         return;
1218                 /* Can't deal with IP options (headers != 20 bytes) */
1219                 if ((ip->ip_hl_v & 0x0f) > 0x05)
1220                         return;
1221                 /* Check the Checksum of the header */
1222                 if (!ip_checksum_ok((uchar *)ip, IP_HDR_SIZE)) {
1223                         debug("checksum bad\n");
1224                         return;
1225                 }
1226                 /* If it is not for us, ignore it */
1227                 dst_ip = net_read_ip(&ip->ip_dst);
1228                 if (net_ip.s_addr && dst_ip.s_addr != net_ip.s_addr &&
1229                     dst_ip.s_addr != 0xFFFFFFFF) {
1230                                 return;
1231                 }
1232                 /* Read source IP address for later use */
1233                 src_ip = net_read_ip(&ip->ip_src);
1234                 /*
1235                  * The function returns the unchanged packet if it's not
1236                  * a fragment, and either the complete packet or NULL if
1237                  * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1238                  */
1239                 ip = net_defragment(ip, &len);
1240                 if (!ip)
1241                         return;
1242                 /*
1243                  * watch for ICMP host redirects
1244                  *
1245                  * There is no real handler code (yet). We just watch
1246                  * for ICMP host redirect messages. In case anybody
1247                  * sees these messages: please contact me
1248                  * (wd@denx.de), or - even better - send me the
1249                  * necessary fixes :-)
1250                  *
1251                  * Note: in all cases where I have seen this so far
1252                  * it was a problem with the router configuration,
1253                  * for instance when a router was configured in the
1254                  * BOOTP reply, but the TFTP server was on the same
1255                  * subnet. So this is probably a warning that your
1256                  * configuration might be wrong. But I'm not really
1257                  * sure if there aren't any other situations.
1258                  *
1259                  * Simon Glass <sjg@chromium.org>: We get an ICMP when
1260                  * we send a tftp packet to a dead connection, or when
1261                  * there is no server at the other end.
1262                  */
1263                 if (ip->ip_p == IPPROTO_ICMP) {
1264                         receive_icmp(ip, len, src_ip, et);
1265                         return;
1266                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1267                         return;
1268                 }
1269
1270                 if (ntohs(ip->udp_len) < UDP_HDR_SIZE || ntohs(ip->udp_len) > ntohs(ip->ip_len))
1271                         return;
1272
1273                 debug_cond(DEBUG_DEV_PKT,
1274                            "received UDP (to=%pI4, from=%pI4, len=%d)\n",
1275                            &dst_ip, &src_ip, len);
1276
1277 #ifdef CONFIG_UDP_CHECKSUM
1278                 if (ip->udp_xsum != 0) {
1279                         ulong   xsum;
1280                         u8 *sumptr;
1281                         ushort  sumlen;
1282
1283                         xsum  = ip->ip_p;
1284                         xsum += (ntohs(ip->udp_len));
1285                         xsum += (ntohl(ip->ip_src.s_addr) >> 16) & 0x0000ffff;
1286                         xsum += (ntohl(ip->ip_src.s_addr) >>  0) & 0x0000ffff;
1287                         xsum += (ntohl(ip->ip_dst.s_addr) >> 16) & 0x0000ffff;
1288                         xsum += (ntohl(ip->ip_dst.s_addr) >>  0) & 0x0000ffff;
1289
1290                         sumlen = ntohs(ip->udp_len);
1291                         sumptr = (u8 *)&ip->udp_src;
1292
1293                         while (sumlen > 1) {
1294                                 /* inlined ntohs() to avoid alignment errors */
1295                                 xsum += (sumptr[0] << 8) + sumptr[1];
1296                                 sumptr += 2;
1297                                 sumlen -= 2;
1298                         }
1299                         if (sumlen > 0)
1300                                 xsum += (sumptr[0] << 8) + sumptr[0];
1301                         while ((xsum >> 16) != 0) {
1302                                 xsum = (xsum & 0x0000ffff) +
1303                                        ((xsum >> 16) & 0x0000ffff);
1304                         }
1305                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1306                                 printf(" UDP wrong checksum %08lx %08x\n",
1307                                        xsum, ntohs(ip->udp_xsum));
1308                                 return;
1309                         }
1310                 }
1311 #endif
1312
1313 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
1314                 nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
1315                                 src_ip,
1316                                 ntohs(ip->udp_dst),
1317                                 ntohs(ip->udp_src),
1318                                 ntohs(ip->udp_len) - UDP_HDR_SIZE);
1319 #endif
1320                 /*
1321                  * IP header OK.  Pass the packet to the current handler.
1322                  */
1323                 (*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE,
1324                                       ntohs(ip->udp_dst),
1325                                       src_ip,
1326                                       ntohs(ip->udp_src),
1327                                       ntohs(ip->udp_len) - UDP_HDR_SIZE);
1328                 break;
1329 #ifdef CONFIG_CMD_WOL
1330         case PROT_WOL:
1331                 wol_receive(ip, len);
1332                 break;
1333 #endif
1334         }
1335 }
1336
1337 /**********************************************************************/
1338
1339 static int net_check_prereq(enum proto_t protocol)
1340 {
1341         switch (protocol) {
1342                 /* Fall through */
1343 #if defined(CONFIG_CMD_PING)
1344         case PING:
1345                 if (net_ping_ip.s_addr == 0) {
1346                         puts("*** ERROR: ping address not given\n");
1347                         return 1;
1348                 }
1349                 goto common;
1350 #endif
1351 #if defined(CONFIG_CMD_SNTP)
1352         case SNTP:
1353                 if (net_ntp_server.s_addr == 0) {
1354                         puts("*** ERROR: NTP server address not given\n");
1355                         return 1;
1356                 }
1357                 goto common;
1358 #endif
1359 #if defined(CONFIG_CMD_DNS)
1360         case DNS:
1361                 if (net_dns_server.s_addr == 0) {
1362                         puts("*** ERROR: DNS server address not given\n");
1363                         return 1;
1364                 }
1365                 goto common;
1366 #endif
1367 #if defined(CONFIG_CMD_NFS)
1368         case NFS:
1369 #endif
1370                 /* Fall through */
1371         case TFTPGET:
1372         case TFTPPUT:
1373                 if (net_server_ip.s_addr == 0 && !is_serverip_in_cmd()) {
1374                         puts("*** ERROR: `serverip' not set\n");
1375                         return 1;
1376                 }
1377 #if     defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
1378         defined(CONFIG_CMD_DNS)
1379 common:
1380 #endif
1381                 /* Fall through */
1382
1383         case NETCONS:
1384         case FASTBOOT:
1385         case TFTPSRV:
1386                 if (net_ip.s_addr == 0) {
1387                         puts("*** ERROR: `ipaddr' not set\n");
1388                         return 1;
1389                 }
1390                 /* Fall through */
1391
1392 #ifdef CONFIG_CMD_RARP
1393         case RARP:
1394 #endif
1395         case BOOTP:
1396         case CDP:
1397         case DHCP:
1398         case LINKLOCAL:
1399                 if (memcmp(net_ethaddr, "\0\0\0\0\0\0", 6) == 0) {
1400                         int num = eth_get_dev_index();
1401
1402                         switch (num) {
1403                         case -1:
1404                                 puts("*** ERROR: No ethernet found.\n");
1405                                 return 1;
1406                         case 0:
1407                                 puts("*** ERROR: `ethaddr' not set\n");
1408                                 break;
1409                         default:
1410                                 printf("*** ERROR: `eth%daddr' not set\n",
1411                                        num);
1412                                 break;
1413                         }
1414
1415                         net_start_again();
1416                         return 2;
1417                 }
1418                 /* Fall through */
1419         default:
1420                 return 0;
1421         }
1422         return 0;               /* OK */
1423 }
1424 /**********************************************************************/
1425
1426 int
1427 net_eth_hdr_size(void)
1428 {
1429         ushort myvlanid;
1430
1431         myvlanid = ntohs(net_our_vlan);
1432         if (myvlanid == (ushort)-1)
1433                 myvlanid = VLAN_NONE;
1434
1435         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1436                 VLAN_ETHER_HDR_SIZE;
1437 }
1438
1439 int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot)
1440 {
1441         struct ethernet_hdr *et = (struct ethernet_hdr *)xet;
1442         ushort myvlanid;
1443
1444         myvlanid = ntohs(net_our_vlan);
1445         if (myvlanid == (ushort)-1)
1446                 myvlanid = VLAN_NONE;
1447
1448         memcpy(et->et_dest, dest_ethaddr, 6);
1449         memcpy(et->et_src, net_ethaddr, 6);
1450         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1451                 et->et_protlen = htons(prot);
1452                 return ETHER_HDR_SIZE;
1453         } else {
1454                 struct vlan_ethernet_hdr *vet =
1455                         (struct vlan_ethernet_hdr *)xet;
1456
1457                 vet->vet_vlan_type = htons(PROT_VLAN);
1458                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1459                 vet->vet_type = htons(prot);
1460                 return VLAN_ETHER_HDR_SIZE;
1461         }
1462 }
1463
1464 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
1465 {
1466         ushort protlen;
1467
1468         memcpy(et->et_dest, addr, 6);
1469         memcpy(et->et_src, net_ethaddr, 6);
1470         protlen = ntohs(et->et_protlen);
1471         if (protlen == PROT_VLAN) {
1472                 struct vlan_ethernet_hdr *vet =
1473                         (struct vlan_ethernet_hdr *)et;
1474                 vet->vet_type = htons(prot);
1475                 return VLAN_ETHER_HDR_SIZE;
1476         } else if (protlen > 1514) {
1477                 et->et_protlen = htons(prot);
1478                 return ETHER_HDR_SIZE;
1479         } else {
1480                 /* 802.2 + SNAP */
1481                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1482                 et802->et_prot = htons(prot);
1483                 return E802_HDR_SIZE;
1484         }
1485 }
1486
1487 void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source,
1488                        u16 pkt_len, u8 proto)
1489 {
1490         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1491
1492         /*
1493          *      Construct an IP header.
1494          */
1495         /* IP_HDR_SIZE / 4 (not including UDP) */
1496         ip->ip_hl_v  = 0x45;
1497         ip->ip_tos   = 0;
1498         ip->ip_len   = htons(pkt_len);
1499         ip->ip_p     = proto;
1500         ip->ip_id    = htons(net_ip_id++);
1501         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1502         ip->ip_ttl   = 255;
1503         ip->ip_sum   = 0;
1504         /* already in network byte order */
1505         net_copy_ip((void *)&ip->ip_src, &source);
1506         /* already in network byte order */
1507         net_copy_ip((void *)&ip->ip_dst, &dest);
1508
1509         ip->ip_sum   = compute_ip_checksum(ip, IP_HDR_SIZE);
1510 }
1511
1512 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport,
1513                         int len)
1514 {
1515         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1516
1517         /*
1518          *      If the data is an odd number of bytes, zero the
1519          *      byte after the last byte so that the checksum
1520          *      will work.
1521          */
1522         if (len & 1)
1523                 pkt[IP_UDP_HDR_SIZE + len] = 0;
1524
1525         net_set_ip_header(pkt, dest, net_ip, IP_UDP_HDR_SIZE + len,
1526                           IPPROTO_UDP);
1527
1528         ip->udp_src  = htons(sport);
1529         ip->udp_dst  = htons(dport);
1530         ip->udp_len  = htons(UDP_HDR_SIZE + len);
1531         ip->udp_xsum = 0;
1532 }
1533
1534 void copy_filename(char *dst, const char *src, int size)
1535 {
1536         if (src && *src && (*src == '"')) {
1537                 ++src;
1538                 --size;
1539         }
1540
1541         while ((--size > 0) && src && *src && (*src != '"'))
1542                 *dst++ = *src++;
1543         *dst = '\0';
1544 }
1545
1546 int is_serverip_in_cmd(void)
1547 {
1548         return !!strchr(net_boot_file_name, ':');
1549 }
1550
1551 int net_parse_bootfile(struct in_addr *ipaddr, char *filename, int max_len)
1552 {
1553         char *colon;
1554
1555         if (net_boot_file_name[0] == '\0')
1556                 return 0;
1557
1558         colon = strchr(net_boot_file_name, ':');
1559         if (colon) {
1560                 if (ipaddr)
1561                         *ipaddr = string_to_ip(net_boot_file_name);
1562                 strncpy(filename, colon + 1, max_len);
1563         } else {
1564                 strncpy(filename, net_boot_file_name, max_len);
1565         }
1566         filename[max_len - 1] = '\0';
1567
1568         return 1;
1569 }
1570
1571 void ip_to_string(struct in_addr x, char *s)
1572 {
1573         x.s_addr = ntohl(x.s_addr);
1574         sprintf(s, "%d.%d.%d.%d",
1575                 (int) ((x.s_addr >> 24) & 0xff),
1576                 (int) ((x.s_addr >> 16) & 0xff),
1577                 (int) ((x.s_addr >> 8) & 0xff),
1578                 (int) ((x.s_addr >> 0) & 0xff)
1579         );
1580 }
1581
1582 void vlan_to_string(ushort x, char *s)
1583 {
1584         x = ntohs(x);
1585
1586         if (x == (ushort)-1)
1587                 x = VLAN_NONE;
1588
1589         if (x == VLAN_NONE)
1590                 strcpy(s, "none");
1591         else
1592                 sprintf(s, "%d", x & VLAN_IDMASK);
1593 }
1594
1595 ushort string_to_vlan(const char *s)
1596 {
1597         ushort id;
1598
1599         if (s == NULL)
1600                 return htons(VLAN_NONE);
1601
1602         if (*s < '0' || *s > '9')
1603                 id = VLAN_NONE;
1604         else
1605                 id = (ushort)simple_strtoul(s, NULL, 10);
1606
1607         return htons(id);
1608 }
1609
1610 ushort env_get_vlan(char *var)
1611 {
1612         return string_to_vlan(env_get(var));
1613 }