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 /* Indicates whether the file name was specified on the command line */
 178 bool net_boot_file_name_explicit;
 179 /* The actual transferred size of the bootfile (in bytes) */
 180 u32 net_boot_file_size;
 181 /* Boot file size in blocks as reported by the DHCP server */
 182 u32 net_boot_file_expected_size_in_blocks;
 183
 184 #if defined(CONFIG_CMD_SNTP)
 185 /* NTP server IP address */
 186 struct in_addr  net_ntp_server;
 187 /* offset time from UTC */
 188 int             net_ntp_time_offset;
 189 #endif
 190
 191 static uchar net_pkt_buf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 192 /* Receive packets */
 193 uchar *net_rx_packets[PKTBUFSRX];
 194 /* Current UDP RX packet handler */
 195 static rxhand_f *udp_packet_handler;
 196 /* Current ARP RX packet handler */
 197 static rxhand_f *arp_packet_handler;
 198 #ifdef CONFIG_CMD_TFTPPUT
 199 /* Current ICMP rx handler */
 200 static rxhand_icmp_f *packet_icmp_handler;
 201 #endif
 202 /* Current timeout handler */
 203 static thand_f *time_handler;
 204 /* Time base value */
 205 static ulong    time_start;
 206 /* Current timeout value */
 207 static ulong    time_delta;
 208 /* THE transmit packet */
 209 uchar *net_tx_packet;
 210
 211 static int net_check_prereq(enum proto_t protocol);
 212
 213 static int net_try_count;
 214
 215 int __maybe_unused net_busy_flag;
 216
 217 /**********************************************************************/
 218
 219 static int on_ipaddr(const char *name, const char *value, enum env_op op,
 220         int flags)
 221 {
 222         if (flags & H_PROGRAMMATIC)
 223                 return 0;
 224
 225         net_ip = string_to_ip(value);
 226
 227         return 0;
 228 }
 229 U_BOOT_ENV_CALLBACK(ipaddr, on_ipaddr);
 230
 231 static int on_gatewayip(const char *name, const char *value, enum env_op op,
 232         int flags)
 233 {
 234         if (flags & H_PROGRAMMATIC)
 235                 return 0;
 236
 237         net_gateway = string_to_ip(value);
 238
 239         return 0;
 240 }
 241 U_BOOT_ENV_CALLBACK(gatewayip, on_gatewayip);
 242
 243 static int on_netmask(const char *name, const char *value, enum env_op op,
 244         int flags)
 245 {
 246         if (flags & H_PROGRAMMATIC)
 247                 return 0;
 248
 249         net_netmask = string_to_ip(value);
 250
 251         return 0;
 252 }
 253 U_BOOT_ENV_CALLBACK(netmask, on_netmask);
 254
 255 static int on_serverip(const char *name, const char *value, enum env_op op,
 256         int flags)
 257 {
 258         if (flags & H_PROGRAMMATIC)
 259                 return 0;
 260
 261         net_server_ip = string_to_ip(value);
 262
 263         return 0;
 264 }
 265 U_BOOT_ENV_CALLBACK(serverip, on_serverip);
 266
 267 static int on_nvlan(const char *name, const char *value, enum env_op op,
 268         int flags)
 269 {
 270         if (flags & H_PROGRAMMATIC)
 271                 return 0;
 272
 273         net_native_vlan = string_to_vlan(value);
 274
 275         return 0;
 276 }
 277 U_BOOT_ENV_CALLBACK(nvlan, on_nvlan);
 278
 279 static int on_vlan(const char *name, const char *value, enum env_op op,
 280         int flags)
 281 {
 282         if (flags & H_PROGRAMMATIC)
 283                 return 0;
 284
 285         net_our_vlan = string_to_vlan(value);
 286
 287         return 0;
 288 }
 289 U_BOOT_ENV_CALLBACK(vlan, on_vlan);
 290
 291 #if defined(CONFIG_CMD_DNS)
 292 static int on_dnsip(const char *name, const char *value, enum env_op op,
 293         int flags)
 294 {
 295         if (flags & H_PROGRAMMATIC)
 296                 return 0;
 297
 298         net_dns_server = string_to_ip(value);
 299
 300         return 0;
 301 }
 302 U_BOOT_ENV_CALLBACK(dnsip, on_dnsip);
 303 #endif
 304
 305 /*
 306  * Check if autoload is enabled. If so, use either NFS or TFTP to download
 307  * the boot file.
 308  */
 309 void net_auto_load(void)
 310 {
 311 #if defined(CONFIG_CMD_NFS)
 312         const char *s = env_get("autoload");
 313
 314         if (s != NULL && strcmp(s, "NFS") == 0) {
 315                 if (net_check_prereq(NFS)) {
 316 /* We aren't expecting to get a serverip, so just accept the assigned IP */
 317 #ifdef CONFIG_BOOTP_SERVERIP
 318                         net_set_state(NETLOOP_SUCCESS);
 319 #else
 320                         printf("Cannot autoload with NFS\n");
 321                         net_set_state(NETLOOP_FAIL);
 322 #endif
 323                         return;
 324                 }
 325                 /*
 326                  * Use NFS to load the bootfile.
 327                  */
 328                 nfs_start();
 329                 return;
 330         }
 331 #endif
 332         if (env_get_yesno("autoload") == 0) {
 333                 /*
 334                  * Just use BOOTP/RARP to configure system;
 335                  * Do not use TFTP to load the bootfile.
 336                  */
 337                 net_set_state(NETLOOP_SUCCESS);
 338                 return;
 339         }
 340         if (net_check_prereq(TFTPGET)) {
 341 /* We aren't expecting to get a serverip, so just accept the assigned IP */
 342 #ifdef CONFIG_BOOTP_SERVERIP
 343                 net_set_state(NETLOOP_SUCCESS);
 344 #else
 345                 printf("Cannot autoload with TFTPGET\n");
 346                 net_set_state(NETLOOP_FAIL);
 347 #endif
 348                 return;
 349         }
 350         tftp_start(TFTPGET);
 351 }
 352
 353 static void net_init_loop(void)
 354 {
 355         if (eth_get_dev())
 356                 memcpy(net_ethaddr, eth_get_ethaddr(), 6);
 357
 358         return;
 359 }
 360
 361 static void net_clear_handlers(void)
 362 {
 363         net_set_udp_handler(NULL);
 364         net_set_arp_handler(NULL);
 365         net_set_timeout_handler(0, NULL);
 366 }
 367
 368 static void net_cleanup_loop(void)
 369 {
 370         net_clear_handlers();
 371 }
 372
 373 void net_init(void)
 374 {
 375         static int first_call = 1;
 376
 377         if (first_call) {
 378                 /*
 379                  *      Setup packet buffers, aligned correctly.
 380                  */
 381                 int i;
 382
 383                 net_tx_packet = &net_pkt_buf[0] + (PKTALIGN - 1);
 384                 net_tx_packet -= (ulong)net_tx_packet % PKTALIGN;
 385                 for (i = 0; i < PKTBUFSRX; i++) {
 386                         net_rx_packets[i] = net_tx_packet +
 387                                 (i + 1) * PKTSIZE_ALIGN;
 388                 }
 389                 arp_init();
 390                 net_clear_handlers();
 391
 392                 /* Only need to setup buffer pointers once. */
 393                 first_call = 0;
 394         }
 395
 396         net_init_loop();
 397 }
 398
 399 /**********************************************************************/
 400 /*
 401  *      Main network processing loop.
 402  */
 403
 404 int net_loop(enum proto_t protocol)
 405 {
 406         int ret = -EINVAL;
 407         enum net_loop_state prev_net_state = net_state;
 408
 409         net_restarted = 0;
 410         net_dev_exists = 0;
 411         net_try_count = 1;
 412         debug_cond(DEBUG_INT_STATE, "--- net_loop Entry\n");
 413
 414         bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
 415         net_init();
 416         if (eth_is_on_demand_init() || protocol != NETCONS) {
 417                 eth_halt();
 418                 eth_set_current();
 419                 ret = eth_init();
 420                 if (ret < 0) {
 421                         eth_halt();
 422                         return ret;
 423                 }
 424         } else {
 425                 eth_init_state_only();
 426         }
 427 restart:
 428 #ifdef CONFIG_USB_KEYBOARD
 429         net_busy_flag = 0;
 430 #endif
 431         net_set_state(NETLOOP_CONTINUE);
 432
 433         /*
 434          *      Start the ball rolling with the given start function.  From
 435          *      here on, this code is a state machine driven by received
 436          *      packets and timer events.
 437          */
 438         debug_cond(DEBUG_INT_STATE, "--- net_loop Init\n");
 439         net_init_loop();
 440
 441         switch (net_check_prereq(protocol)) {
 442         case 1:
 443                 /* network not configured */
 444                 eth_halt();
 445                 net_set_state(prev_net_state);
 446                 return -ENODEV;
 447
 448         case 2:
 449                 /* network device not configured */
 450                 break;
 451
 452         case 0:
 453                 net_dev_exists = 1;
 454                 net_boot_file_size = 0;
 455                 switch (protocol) {
 456                 case TFTPGET:
 457 #ifdef CONFIG_CMD_TFTPPUT
 458                 case TFTPPUT:
 459 #endif
 460                         /* always use ARP to get server ethernet address */
 461                         tftp_start(protocol);
 462                         break;
 463 #ifdef CONFIG_CMD_TFTPSRV
 464                 case TFTPSRV:
 465                         tftp_start_server();
 466                         break;
 467 #endif
 468 #ifdef CONFIG_UDP_FUNCTION_FASTBOOT
 469                 case FASTBOOT:
 470                         fastboot_start_server();
 471                         break;
 472 #endif
 473 #if defined(CONFIG_CMD_DHCP)
 474                 case DHCP:
 475                         bootp_reset();
 476                         net_ip.s_addr = 0;
 477                         dhcp_request();         /* Basically same as BOOTP */
 478                         break;
 479 #endif
 480
 481                 case BOOTP:
 482                         bootp_reset();
 483                         net_ip.s_addr = 0;
 484                         bootp_request();
 485                         break;
 486
 487 #if defined(CONFIG_CMD_RARP)
 488                 case RARP:
 489                         rarp_try = 0;
 490                         net_ip.s_addr = 0;
 491                         rarp_request();
 492                         break;
 493 #endif
 494 #if defined(CONFIG_CMD_PING)
 495                 case PING:
 496                         ping_start();
 497                         break;
 498 #endif
 499 #if defined(CONFIG_CMD_NFS)
 500                 case NFS:
 501                         nfs_start();
 502                         break;
 503 #endif
 504 #if defined(CONFIG_CMD_CDP)
 505                 case CDP:
 506                         cdp_start();
 507                         break;
 508 #endif
 509 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
 510                 case NETCONS:
 511                         nc_start();
 512                         break;
 513 #endif
 514 #if defined(CONFIG_CMD_SNTP)
 515                 case SNTP:
 516                         sntp_start();
 517                         break;
 518 #endif
 519 #if defined(CONFIG_CMD_DNS)
 520                 case DNS:
 521                         dns_start();
 522                         break;
 523 #endif
 524 #if defined(CONFIG_CMD_LINK_LOCAL)
 525                 case LINKLOCAL:
 526                         link_local_start();
 527                         break;
 528 #endif
 529 #if defined(CONFIG_CMD_WOL)
 530                 case WOL:
 531                         wol_start();
 532                         break;
 533 #endif
 534                 default:
 535                         break;
 536                 }
 537
 538                 break;
 539         }
 540
 541 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 542 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 543         defined(CONFIG_LED_STATUS)                      && \
 544         defined(CONFIG_LED_STATUS_RED)
 545         /*
 546          * Echo the inverted link state to the fault LED.
 547          */
 548         if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
 549                 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_OFF);
 550         else
 551                 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_ON);
 552 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 553 #endif /* CONFIG_MII, ... */
 554 #ifdef CONFIG_USB_KEYBOARD
 555         net_busy_flag = 1;
 556 #endif
 557
 558         /*
 559          *      Main packet reception loop.  Loop receiving packets until
 560          *      someone sets `net_state' to a state that terminates.
 561          */
 562         for (;;) {
 563                 WATCHDOG_RESET();
 564 #ifdef CONFIG_SHOW_ACTIVITY
 565                 show_activity(1);
 566 #endif
 567                 if (arp_timeout_check() > 0)
 568                         time_start = get_timer(0);
 569
 570                 /*
 571                  *      Check the ethernet for a new packet.  The ethernet
 572                  *      receive routine will process it.
 573                  *      Most drivers return the most recent packet size, but not
 574                  *      errors that may have happened.
 575                  */
 576                 eth_rx();
 577
 578                 /*
 579                  *      Abort if ctrl-c was pressed.
 580                  */
 581                 if (ctrlc()) {
 582                         /* cancel any ARP that may not have completed */
 583                         net_arp_wait_packet_ip.s_addr = 0;
 584
 585                         net_cleanup_loop();
 586                         eth_halt();
 587                         /* Invalidate the last protocol */
 588                         eth_set_last_protocol(BOOTP);
 589
 590                         puts("\nAbort\n");
 591                         /* include a debug print as well incase the debug
 592                            messages are directed to stderr */
 593                         debug_cond(DEBUG_INT_STATE, "--- net_loop Abort!\n");
 594                         ret = -EINTR;
 595                         goto done;
 596                 }
 597
 598                 /*
 599                  *      Check for a timeout, and run the timeout handler
 600                  *      if we have one.
 601                  */
 602                 if (time_handler &&
 603                     ((get_timer(0) - time_start) > time_delta)) {
 604                         thand_f *x;
 605
 606 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 607 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 608         defined(CONFIG_LED_STATUS)                      && \
 609         defined(CONFIG_LED_STATUS_RED)
 610                         /*
 611                          * Echo the inverted link state to the fault LED.
 612                          */
 613                         if (miiphy_link(eth_get_dev()->name,
 614                                         CONFIG_SYS_FAULT_MII_ADDR))
 615                                 status_led_set(CONFIG_LED_STATUS_RED,
 616                                                CONFIG_LED_STATUS_OFF);
 617                         else
 618                                 status_led_set(CONFIG_LED_STATUS_RED,
 619                                                CONFIG_LED_STATUS_ON);
 620 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 621 #endif /* CONFIG_MII, ... */
 622                         debug_cond(DEBUG_INT_STATE, "--- net_loop timeout\n");
 623                         x = time_handler;
 624                         time_handler = (thand_f *)0;
 625                         (*x)();
 626                 }
 627
 628                 if (net_state == NETLOOP_FAIL)
 629                         ret = net_start_again();
 630
 631                 switch (net_state) {
 632                 case NETLOOP_RESTART:
 633                         net_restarted = 1;
 634                         goto restart;
 635
 636                 case NETLOOP_SUCCESS:
 637                         net_cleanup_loop();
 638                         if (net_boot_file_size > 0) {
 639                                 printf("Bytes transferred = %d (%x hex)\n",
 640                                        net_boot_file_size, net_boot_file_size);
 641                                 env_set_hex("filesize", net_boot_file_size);
 642                                 env_set_hex("fileaddr", load_addr);
 643                         }
 644                         if (protocol != NETCONS)
 645                                 eth_halt();
 646                         else
 647                                 eth_halt_state_only();
 648
 649                         eth_set_last_protocol(protocol);
 650
 651                         ret = net_boot_file_size;
 652                         debug_cond(DEBUG_INT_STATE, "--- net_loop Success!\n");
 653                         goto done;
 654
 655                 case NETLOOP_FAIL:
 656                         net_cleanup_loop();
 657                         /* Invalidate the last protocol */
 658                         eth_set_last_protocol(BOOTP);
 659                         debug_cond(DEBUG_INT_STATE, "--- net_loop Fail!\n");
 660                         ret = -ENONET;
 661                         goto done;
 662
 663                 case NETLOOP_CONTINUE:
 664                         continue;
 665                 }
 666         }
 667
 668 done:
 669 #ifdef CONFIG_USB_KEYBOARD
 670         net_busy_flag = 0;
 671 #endif
 672 #ifdef CONFIG_CMD_TFTPPUT
 673         /* Clear out the handlers */
 674         net_set_udp_handler(NULL);
 675         net_set_icmp_handler(NULL);
 676 #endif
 677         net_set_state(prev_net_state);
 678         return ret;
 679 }
 680
 681 /**********************************************************************/
 682
 683 static void start_again_timeout_handler(void)
 684 {
 685         net_set_state(NETLOOP_RESTART);
 686 }
 687
 688 int net_start_again(void)
 689 {
 690         char *nretry;
 691         int retry_forever = 0;
 692         unsigned long retrycnt = 0;
 693         int ret;
 694
 695         nretry = env_get("netretry");
 696         if (nretry) {
 697                 if (!strcmp(nretry, "yes"))
 698                         retry_forever = 1;
 699                 else if (!strcmp(nretry, "no"))
 700                         retrycnt = 0;
 701                 else if (!strcmp(nretry, "once"))
 702                         retrycnt = 1;
 703                 else
 704                         retrycnt = simple_strtoul(nretry, NULL, 0);
 705         } else {
 706                 retrycnt = 0;
 707                 retry_forever = 0;
 708         }
 709
 710         if ((!retry_forever) && (net_try_count > retrycnt)) {
 711                 eth_halt();
 712                 net_set_state(NETLOOP_FAIL);
 713                 /*
 714                  * We don't provide a way for the protocol to return an error,
 715                  * but this is almost always the reason.
 716                  */
 717                 return -ETIMEDOUT;
 718         }
 719
 720         net_try_count++;
 721
 722         eth_halt();
 723 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
 724         eth_try_another(!net_restarted);
 725 #endif
 726         ret = eth_init();
 727         if (net_restart_wrap) {
 728                 net_restart_wrap = 0;
 729                 if (net_dev_exists) {
 730                         net_set_timeout_handler(10000UL,
 731                                                 start_again_timeout_handler);
 732                         net_set_udp_handler(NULL);
 733                 } else {
 734                         net_set_state(NETLOOP_FAIL);
 735                 }
 736         } else {
 737                 net_set_state(NETLOOP_RESTART);
 738         }
 739         return ret;
 740 }
 741
 742 /**********************************************************************/
 743 /*
 744  *      Miscelaneous bits.
 745  */
 746
 747 static void dummy_handler(uchar *pkt, unsigned dport,
 748                         struct in_addr sip, unsigned sport,
 749                         unsigned len)
 750 {
 751 }
 752
 753 rxhand_f *net_get_udp_handler(void)
 754 {
 755         return udp_packet_handler;
 756 }
 757
 758 void net_set_udp_handler(rxhand_f *f)
 759 {
 760         debug_cond(DEBUG_INT_STATE, "--- net_loop UDP handler set (%p)\n", f);
 761         if (f == NULL)
 762                 udp_packet_handler = dummy_handler;
 763         else
 764                 udp_packet_handler = f;
 765 }
 766
 767 rxhand_f *net_get_arp_handler(void)
 768 {
 769         return arp_packet_handler;
 770 }
 771
 772 void net_set_arp_handler(rxhand_f *f)
 773 {
 774         debug_cond(DEBUG_INT_STATE, "--- net_loop ARP handler set (%p)\n", f);
 775         if (f == NULL)
 776                 arp_packet_handler = dummy_handler;
 777         else
 778                 arp_packet_handler = f;
 779 }
 780
 781 #ifdef CONFIG_CMD_TFTPPUT
 782 void net_set_icmp_handler(rxhand_icmp_f *f)
 783 {
 784         packet_icmp_handler = f;
 785 }
 786 #endif
 787
 788 void net_set_timeout_handler(ulong iv, thand_f *f)
 789 {
 790         if (iv == 0) {
 791                 debug_cond(DEBUG_INT_STATE,
 792                            "--- net_loop timeout handler cancelled\n");
 793                 time_handler = (thand_f *)0;
 794         } else {
 795                 debug_cond(DEBUG_INT_STATE,
 796                            "--- net_loop timeout handler set (%p)\n", f);
 797                 time_handler = f;
 798                 time_start = get_timer(0);
 799                 time_delta = iv * CONFIG_SYS_HZ / 1000;
 800         }
 801 }
 802
 803 uchar *net_get_async_tx_pkt_buf(void)
 804 {
 805         if (arp_is_waiting())
 806                 return arp_tx_packet; /* If we are waiting, we already sent */
 807         else
 808                 return net_tx_packet;
 809 }
 810
 811 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
 812                 int payload_len)
 813 {
 814         return net_send_ip_packet(ether, dest, dport, sport, payload_len,
 815                                   IPPROTO_UDP, 0, 0, 0);
 816 }
 817
 818 int net_send_ip_packet(uchar *ether, struct in_addr dest, int dport, int sport,
 819                        int payload_len, int proto, u8 action, u32 tcp_seq_num,
 820                        u32 tcp_ack_num)
 821 {
 822         uchar *pkt;
 823         int eth_hdr_size;
 824         int pkt_hdr_size;
 825
 826         /* make sure the net_tx_packet is initialized (net_init() was called) */
 827         assert(net_tx_packet != NULL);
 828         if (net_tx_packet == NULL)
 829                 return -1;
 830
 831         /* convert to new style broadcast */
 832         if (dest.s_addr == 0)
 833                 dest.s_addr = 0xFFFFFFFF;
 834
 835         /* if broadcast, make the ether address a broadcast and don't do ARP */
 836         if (dest.s_addr == 0xFFFFFFFF)
 837                 ether = (uchar *)net_bcast_ethaddr;
 838
 839         pkt = (uchar *)net_tx_packet;
 840
 841         eth_hdr_size = net_set_ether(pkt, ether, PROT_IP);
 842
 843         switch (proto) {
 844         case IPPROTO_UDP:
 845                 net_set_udp_header(pkt + eth_hdr_size, dest, dport, sport,
 846                                    payload_len);
 847                 pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
 848                 break;
 849         default:
 850                 return -EINVAL;
 851         }
 852
 853         /* if MAC address was not discovered yet, do an ARP request */
 854         if (memcmp(ether, net_null_ethaddr, 6) == 0) {
 855                 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest);
 856
 857                 /* save the ip and eth addr for the packet to send after arp */
 858                 net_arp_wait_packet_ip = dest;
 859                 arp_wait_packet_ethaddr = ether;
 860
 861                 /* size of the waiting packet */
 862                 arp_wait_tx_packet_size = pkt_hdr_size + payload_len;
 863
 864                 /* and do the ARP request */
 865                 arp_wait_try = 1;
 866                 arp_wait_timer_start = get_timer(0);
 867                 arp_request();
 868                 return 1;       /* waiting */
 869         } else {
 870                 debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
 871                            &dest, ether);
 872                 net_send_packet(net_tx_packet, pkt_hdr_size + payload_len);
 873                 return 0;       /* transmitted */
 874         }
 875 }
 876
 877 #ifdef CONFIG_IP_DEFRAG
 878 /*
 879  * This function collects fragments in a single packet, according
 880  * to the algorithm in RFC815. It returns NULL or the pointer to
 881  * a complete packet, in static storage
 882  */
 883 #ifndef CONFIG_NET_MAXDEFRAG
 884 #define CONFIG_NET_MAXDEFRAG 16384
 885 #endif
 886 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG)
 887
 888 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE)
 889
 890 /*
 891  * this is the packet being assembled, either data or frag control.
 892  * Fragments go by 8 bytes, so this union must be 8 bytes long
 893  */
 894 struct hole {
 895         /* first_byte is address of this structure */
 896         u16 last_byte;  /* last byte in this hole + 1 (begin of next hole) */
 897         u16 next_hole;  /* index of next (in 8-b blocks), 0 == none */
 898         u16 prev_hole;  /* index of prev, 0 == none */
 899         u16 unused;
 900 };
 901
 902 static struct ip_udp_hdr *__net_defragment(struct ip_udp_hdr *ip, int *lenp)
 903 {
 904         static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
 905         static u16 first_hole, total_len;
 906         struct hole *payload, *thisfrag, *h, *newh;
 907         struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff;
 908         uchar *indata = (uchar *)ip;
 909         int offset8, start, len, done = 0;
 910         u16 ip_off = ntohs(ip->ip_off);
 911
 912         /* payload starts after IP header, this fragment is in there */
 913         payload = (struct hole *)(pkt_buff + IP_HDR_SIZE);
 914         offset8 =  (ip_off & IP_OFFS);
 915         thisfrag = payload + offset8;
 916         start = offset8 * 8;
 917         len = ntohs(ip->ip_len) - IP_HDR_SIZE;
 918
 919         if (start + len > IP_MAXUDP) /* fragment extends too far */
 920                 return NULL;
 921
 922         if (!total_len || localip->ip_id != ip->ip_id) {
 923                 /* new (or different) packet, reset structs */
 924                 total_len = 0xffff;
 925                 payload[0].last_byte = ~0;
 926                 payload[0].next_hole = 0;
 927                 payload[0].prev_hole = 0;
 928                 first_hole = 0;
 929                 /* any IP header will work, copy the first we received */
 930                 memcpy(localip, ip, IP_HDR_SIZE);
 931         }
 932
 933         /*
 934          * What follows is the reassembly algorithm. We use the payload
 935          * array as a linked list of hole descriptors, as each hole starts
 936          * at a multiple of 8 bytes. However, last byte can be whatever value,
 937          * so it is represented as byte count, not as 8-byte blocks.
 938          */
 939
 940         h = payload + first_hole;
 941         while (h->last_byte < start) {
 942                 if (!h->next_hole) {
 943                         /* no hole that far away */
 944                         return NULL;
 945                 }
 946                 h = payload + h->next_hole;
 947         }
 948
 949         /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
 950         if (offset8 + ((len + 7) / 8) <= h - payload) {
 951                 /* no overlap with holes (dup fragment?) */
 952                 return NULL;
 953         }
 954
 955         if (!(ip_off & IP_FLAGS_MFRAG)) {
 956                 /* no more fragmentss: truncate this (last) hole */
 957                 total_len = start + len;
 958                 h->last_byte = start + len;
 959         }
 960
 961         /*
 962          * There is some overlap: fix the hole list. This code doesn't
 963          * deal with a fragment that overlaps with two different holes
 964          * (thus being a superset of a previously-received fragment).
 965          */
 966
 967         if ((h >= thisfrag) && (h->last_byte <= start + len)) {
 968                 /* complete overlap with hole: remove hole */
 969                 if (!h->prev_hole && !h->next_hole) {
 970                         /* last remaining hole */
 971                         done = 1;
 972                 } else if (!h->prev_hole) {
 973                         /* first hole */
 974                         first_hole = h->next_hole;
 975                         payload[h->next_hole].prev_hole = 0;
 976                 } else if (!h->next_hole) {
 977                         /* last hole */
 978                         payload[h->prev_hole].next_hole = 0;
 979                 } else {
 980                         /* in the middle of the list */
 981                         payload[h->next_hole].prev_hole = h->prev_hole;
 982                         payload[h->prev_hole].next_hole = h->next_hole;
 983                 }
 984
 985         } else if (h->last_byte <= start + len) {
 986                 /* overlaps with final part of the hole: shorten this hole */
 987                 h->last_byte = start;
 988
 989         } else if (h >= thisfrag) {
 990                 /* overlaps with initial part of the hole: move this hole */
 991                 newh = thisfrag + (len / 8);
 992                 *newh = *h;
 993                 h = newh;
 994                 if (h->next_hole)
 995                         payload[h->next_hole].prev_hole = (h - payload);
 996                 if (h->prev_hole)
 997                         payload[h->prev_hole].next_hole = (h - payload);
 998                 else
 999                         first_hole = (h - payload);
1000
1001         } else {
1002                 /* fragment sits in the middle: split the hole */
1003                 newh = thisfrag + (len / 8);
1004                 *newh = *h;
1005                 h->last_byte = start;
1006                 h->next_hole = (newh - payload);
1007                 newh->prev_hole = (h - payload);
1008                 if (newh->next_hole)
1009                         payload[newh->next_hole].prev_hole = (newh - payload);
1010         }
1011
1012         /* finally copy this fragment and possibly return whole packet */
1013         memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len);
1014         if (!done)
1015                 return NULL;
1016
1017         localip->ip_len = htons(total_len);
1018         *lenp = total_len + IP_HDR_SIZE;
1019         return localip;
1020 }
1021
1022 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
1023         int *lenp)
1024 {
1025         u16 ip_off = ntohs(ip->ip_off);
1026         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1027                 return ip; /* not a fragment */
1028         return __net_defragment(ip, lenp);
1029 }
1030
1031 #else /* !CONFIG_IP_DEFRAG */
1032
1033 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
1034         int *lenp)
1035 {
1036         u16 ip_off = ntohs(ip->ip_off);
1037         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1038                 return ip; /* not a fragment */
1039         return NULL;
1040 }
1041 #endif
1042
1043 /**
1044  * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
1045  * drop others.
1046  *
1047  * @parma ip    IP packet containing the ICMP
1048  */
1049 static void receive_icmp(struct ip_udp_hdr *ip, int len,
1050                         struct in_addr src_ip, struct ethernet_hdr *et)
1051 {
1052         struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
1053
1054         switch (icmph->type) {
1055         case ICMP_REDIRECT:
1056                 if (icmph->code != ICMP_REDIR_HOST)
1057                         return;
1058                 printf(" ICMP Host Redirect to %pI4 ",
1059                        &icmph->un.gateway);
1060                 break;
1061         default:
1062 #if defined(CONFIG_CMD_PING)
1063                 ping_receive(et, ip, len);
1064 #endif
1065 #ifdef CONFIG_CMD_TFTPPUT
1066                 if (packet_icmp_handler)
1067                         packet_icmp_handler(icmph->type, icmph->code,
1068                                             ntohs(ip->udp_dst), src_ip,
1069                                             ntohs(ip->udp_src), icmph->un.data,
1070                                             ntohs(ip->udp_len));
1071 #endif
1072                 break;
1073         }
1074 }
1075
1076 void net_process_received_packet(uchar *in_packet, int len)
1077 {
1078         struct ethernet_hdr *et;
1079         struct ip_udp_hdr *ip;
1080         struct in_addr dst_ip;
1081         struct in_addr src_ip;
1082         int eth_proto;
1083 #if defined(CONFIG_CMD_CDP)
1084         int iscdp;
1085 #endif
1086         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1087
1088         debug_cond(DEBUG_NET_PKT, "packet received\n");
1089
1090         net_rx_packet = in_packet;
1091         net_rx_packet_len = len;
1092         et = (struct ethernet_hdr *)in_packet;
1093
1094         /* too small packet? */
1095         if (len < ETHER_HDR_SIZE)
1096                 return;
1097
1098 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
1099         if (push_packet) {
1100                 (*push_packet)(in_packet, len);
1101                 return;
1102         }
1103 #endif
1104
1105 #if defined(CONFIG_CMD_CDP)
1106         /* keep track if packet is CDP */
1107         iscdp = is_cdp_packet(et->et_dest);
1108 #endif
1109
1110         myvlanid = ntohs(net_our_vlan);
1111         if (myvlanid == (ushort)-1)
1112                 myvlanid = VLAN_NONE;
1113         mynvlanid = ntohs(net_native_vlan);
1114         if (mynvlanid == (ushort)-1)
1115                 mynvlanid = VLAN_NONE;
1116
1117         eth_proto = ntohs(et->et_protlen);
1118
1119         if (eth_proto < 1514) {
1120                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1121                 /*
1122                  *      Got a 802.2 packet.  Check the other protocol field.
1123                  *      XXX VLAN over 802.2+SNAP not implemented!
1124                  */
1125                 eth_proto = ntohs(et802->et_prot);
1126
1127                 ip = (struct ip_udp_hdr *)(in_packet + E802_HDR_SIZE);
1128                 len -= E802_HDR_SIZE;
1129
1130         } else if (eth_proto != PROT_VLAN) {    /* normal packet */
1131                 ip = (struct ip_udp_hdr *)(in_packet + ETHER_HDR_SIZE);
1132                 len -= ETHER_HDR_SIZE;
1133
1134         } else {                        /* VLAN packet */
1135                 struct vlan_ethernet_hdr *vet =
1136                         (struct vlan_ethernet_hdr *)et;
1137
1138                 debug_cond(DEBUG_NET_PKT, "VLAN packet received\n");
1139
1140                 /* too small packet? */
1141                 if (len < VLAN_ETHER_HDR_SIZE)
1142                         return;
1143
1144                 /* if no VLAN active */
1145                 if ((ntohs(net_our_vlan) & VLAN_IDMASK) == VLAN_NONE
1146 #if defined(CONFIG_CMD_CDP)
1147                                 && iscdp == 0
1148 #endif
1149                                 )
1150                         return;
1151
1152                 cti = ntohs(vet->vet_tag);
1153                 vlanid = cti & VLAN_IDMASK;
1154                 eth_proto = ntohs(vet->vet_type);
1155
1156                 ip = (struct ip_udp_hdr *)(in_packet + VLAN_ETHER_HDR_SIZE);
1157                 len -= VLAN_ETHER_HDR_SIZE;
1158         }
1159
1160         debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto);
1161
1162 #if defined(CONFIG_CMD_CDP)
1163         if (iscdp) {
1164                 cdp_receive((uchar *)ip, len);
1165                 return;
1166         }
1167 #endif
1168
1169         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1170                 if (vlanid == VLAN_NONE)
1171                         vlanid = (mynvlanid & VLAN_IDMASK);
1172                 /* not matched? */
1173                 if (vlanid != (myvlanid & VLAN_IDMASK))
1174                         return;
1175         }
1176
1177         switch (eth_proto) {
1178         case PROT_ARP:
1179                 arp_receive(et, ip, len);
1180                 break;
1181
1182 #ifdef CONFIG_CMD_RARP
1183         case PROT_RARP:
1184                 rarp_receive(ip, len);
1185                 break;
1186 #endif
1187         case PROT_IP:
1188                 debug_cond(DEBUG_NET_PKT, "Got IP\n");
1189                 /* Before we start poking the header, make sure it is there */
1190                 if (len < IP_UDP_HDR_SIZE) {
1191                         debug("len bad %d < %lu\n", len,
1192                               (ulong)IP_UDP_HDR_SIZE);
1193                         return;
1194                 }
1195                 /* Check the packet length */
1196                 if (len < ntohs(ip->ip_len)) {
1197                         debug("len bad %d < %d\n", len, ntohs(ip->ip_len));
1198                         return;
1199                 }
1200                 len = ntohs(ip->ip_len);
1201                 debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n",
1202                            len, ip->ip_hl_v & 0xff);
1203
1204                 /* Can't deal with anything except IPv4 */
1205                 if ((ip->ip_hl_v & 0xf0) != 0x40)
1206                         return;
1207                 /* Can't deal with IP options (headers != 20 bytes) */
1208                 if ((ip->ip_hl_v & 0x0f) > 0x05)
1209                         return;
1210                 /* Check the Checksum of the header */
1211                 if (!ip_checksum_ok((uchar *)ip, IP_HDR_SIZE)) {
1212                         debug("checksum bad\n");
1213                         return;
1214                 }
1215                 /* If it is not for us, ignore it */
1216                 dst_ip = net_read_ip(&ip->ip_dst);
1217                 if (net_ip.s_addr && dst_ip.s_addr != net_ip.s_addr &&
1218                     dst_ip.s_addr != 0xFFFFFFFF) {
1219 #ifdef CONFIG_MCAST_TFTP
1220                         if (net_mcast_addr != dst_ip)
1221 #endif
1222                                 return;
1223                 }
1224                 /* Read source IP address for later use */
1225                 src_ip = net_read_ip(&ip->ip_src);
1226                 /*
1227                  * The function returns the unchanged packet if it's not
1228                  * a fragment, and either the complete packet or NULL if
1229                  * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1230                  */
1231                 ip = net_defragment(ip, &len);
1232                 if (!ip)
1233                         return;
1234                 /*
1235                  * watch for ICMP host redirects
1236                  *
1237                  * There is no real handler code (yet). We just watch
1238                  * for ICMP host redirect messages. In case anybody
1239                  * sees these messages: please contact me
1240                  * (wd@denx.de), or - even better - send me the
1241                  * necessary fixes :-)
1242                  *
1243                  * Note: in all cases where I have seen this so far
1244                  * it was a problem with the router configuration,
1245                  * for instance when a router was configured in the
1246                  * BOOTP reply, but the TFTP server was on the same
1247                  * subnet. So this is probably a warning that your
1248                  * configuration might be wrong. But I'm not really
1249                  * sure if there aren't any other situations.
1250                  *
1251                  * Simon Glass <sjg@chromium.org>: We get an ICMP when
1252                  * we send a tftp packet to a dead connection, or when
1253                  * there is no server at the other end.
1254                  */
1255                 if (ip->ip_p == IPPROTO_ICMP) {
1256                         receive_icmp(ip, len, src_ip, et);
1257                         return;
1258                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1259                         return;
1260                 }
1261
1262                 debug_cond(DEBUG_DEV_PKT,
1263                            "received UDP (to=%pI4, from=%pI4, len=%d)\n",
1264                            &dst_ip, &src_ip, len);
1265
1266 #ifdef CONFIG_UDP_CHECKSUM
1267                 if (ip->udp_xsum != 0) {
1268                         ulong   xsum;
1269                         ushort *sumptr;
1270                         ushort  sumlen;
1271
1272                         xsum  = ip->ip_p;
1273                         xsum += (ntohs(ip->udp_len));
1274                         xsum += (ntohl(ip->ip_src.s_addr) >> 16) & 0x0000ffff;
1275                         xsum += (ntohl(ip->ip_src.s_addr) >>  0) & 0x0000ffff;
1276                         xsum += (ntohl(ip->ip_dst.s_addr) >> 16) & 0x0000ffff;
1277                         xsum += (ntohl(ip->ip_dst.s_addr) >>  0) & 0x0000ffff;
1278
1279                         sumlen = ntohs(ip->udp_len);
1280                         sumptr = (ushort *)&(ip->udp_src);
1281
1282                         while (sumlen > 1) {
1283                                 ushort sumdata;
1284
1285                                 sumdata = *sumptr++;
1286                                 xsum += ntohs(sumdata);
1287                                 sumlen -= 2;
1288                         }
1289                         if (sumlen > 0) {
1290                                 ushort sumdata;
1291
1292                                 sumdata = *(unsigned char *)sumptr;
1293                                 sumdata = (sumdata << 8) & 0xff00;
1294                                 xsum += sumdata;
1295                         }
1296                         while ((xsum >> 16) != 0) {
1297                                 xsum = (xsum & 0x0000ffff) +
1298                                        ((xsum >> 16) & 0x0000ffff);
1299                         }
1300                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1301                                 printf(" UDP wrong checksum %08lx %08x\n",
1302                                        xsum, ntohs(ip->udp_xsum));
1303                                 return;
1304                         }
1305                 }
1306 #endif
1307
1308 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
1309                 nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
1310                                 src_ip,
1311                                 ntohs(ip->udp_dst),
1312                                 ntohs(ip->udp_src),
1313                                 ntohs(ip->udp_len) - UDP_HDR_SIZE);
1314 #endif
1315                 /*
1316                  * IP header OK.  Pass the packet to the current handler.
1317                  */
1318                 (*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE,
1319                                       ntohs(ip->udp_dst),
1320                                       src_ip,
1321                                       ntohs(ip->udp_src),
1322                                       ntohs(ip->udp_len) - UDP_HDR_SIZE);
1323                 break;
1324 #ifdef CONFIG_CMD_WOL
1325         case PROT_WOL:
1326                 wol_receive(ip, len);
1327                 break;
1328 #endif
1329         }
1330 }
1331
1332 /**********************************************************************/
1333
1334 static int net_check_prereq(enum proto_t protocol)
1335 {
1336         switch (protocol) {
1337                 /* Fall through */
1338 #if defined(CONFIG_CMD_PING)
1339         case PING:
1340                 if (net_ping_ip.s_addr == 0) {
1341                         puts("*** ERROR: ping address not given\n");
1342                         return 1;
1343                 }
1344                 goto common;
1345 #endif
1346 #if defined(CONFIG_CMD_SNTP)
1347         case SNTP:
1348                 if (net_ntp_server.s_addr == 0) {
1349                         puts("*** ERROR: NTP server address not given\n");
1350                         return 1;
1351                 }
1352                 goto common;
1353 #endif
1354 #if defined(CONFIG_CMD_DNS)
1355         case DNS:
1356                 if (net_dns_server.s_addr == 0) {
1357                         puts("*** ERROR: DNS server address not given\n");
1358                         return 1;
1359                 }
1360                 goto common;
1361 #endif
1362 #if defined(CONFIG_CMD_NFS)
1363         case NFS:
1364 #endif
1365                 /* Fall through */
1366         case TFTPGET:
1367         case TFTPPUT:
1368                 if (net_server_ip.s_addr == 0 && !is_serverip_in_cmd()) {
1369                         puts("*** ERROR: `serverip' not set\n");
1370                         return 1;
1371                 }
1372 #if     defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
1373         defined(CONFIG_CMD_DNS)
1374 common:
1375 #endif
1376                 /* Fall through */
1377
1378         case NETCONS:
1379         case FASTBOOT:
1380         case TFTPSRV:
1381                 if (net_ip.s_addr == 0) {
1382                         puts("*** ERROR: `ipaddr' not set\n");
1383                         return 1;
1384                 }
1385                 /* Fall through */
1386
1387 #ifdef CONFIG_CMD_RARP
1388         case RARP:
1389 #endif
1390         case BOOTP:
1391         case CDP:
1392         case DHCP:
1393         case LINKLOCAL:
1394                 if (memcmp(net_ethaddr, "\0\0\0\0\0\0", 6) == 0) {
1395                         int num = eth_get_dev_index();
1396
1397                         switch (num) {
1398                         case -1:
1399                                 puts("*** ERROR: No ethernet found.\n");
1400                                 return 1;
1401                         case 0:
1402                                 puts("*** ERROR: `ethaddr' not set\n");
1403                                 break;
1404                         default:
1405                                 printf("*** ERROR: `eth%daddr' not set\n",
1406                                        num);
1407                                 break;
1408                         }
1409
1410                         net_start_again();
1411                         return 2;
1412                 }
1413                 /* Fall through */
1414         default:
1415                 return 0;
1416         }
1417         return 0;               /* OK */
1418 }
1419 /**********************************************************************/
1420
1421 int
1422 net_eth_hdr_size(void)
1423 {
1424         ushort myvlanid;
1425
1426         myvlanid = ntohs(net_our_vlan);
1427         if (myvlanid == (ushort)-1)
1428                 myvlanid = VLAN_NONE;
1429
1430         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1431                 VLAN_ETHER_HDR_SIZE;
1432 }
1433
1434 int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot)
1435 {
1436         struct ethernet_hdr *et = (struct ethernet_hdr *)xet;
1437         ushort myvlanid;
1438
1439         myvlanid = ntohs(net_our_vlan);
1440         if (myvlanid == (ushort)-1)
1441                 myvlanid = VLAN_NONE;
1442
1443         memcpy(et->et_dest, dest_ethaddr, 6);
1444         memcpy(et->et_src, net_ethaddr, 6);
1445         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1446                 et->et_protlen = htons(prot);
1447                 return ETHER_HDR_SIZE;
1448         } else {
1449                 struct vlan_ethernet_hdr *vet =
1450                         (struct vlan_ethernet_hdr *)xet;
1451
1452                 vet->vet_vlan_type = htons(PROT_VLAN);
1453                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1454                 vet->vet_type = htons(prot);
1455                 return VLAN_ETHER_HDR_SIZE;
1456         }
1457 }
1458
1459 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
1460 {
1461         ushort protlen;
1462
1463         memcpy(et->et_dest, addr, 6);
1464         memcpy(et->et_src, net_ethaddr, 6);
1465         protlen = ntohs(et->et_protlen);
1466         if (protlen == PROT_VLAN) {
1467                 struct vlan_ethernet_hdr *vet =
1468                         (struct vlan_ethernet_hdr *)et;
1469                 vet->vet_type = htons(prot);
1470                 return VLAN_ETHER_HDR_SIZE;
1471         } else if (protlen > 1514) {
1472                 et->et_protlen = htons(prot);
1473                 return ETHER_HDR_SIZE;
1474         } else {
1475                 /* 802.2 + SNAP */
1476                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1477                 et802->et_prot = htons(prot);
1478                 return E802_HDR_SIZE;
1479         }
1480 }
1481
1482 void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source,
1483                        u16 pkt_len, u8 proto)
1484 {
1485         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1486
1487         /*
1488          *      Construct an IP header.
1489          */
1490         /* IP_HDR_SIZE / 4 (not including UDP) */
1491         ip->ip_hl_v  = 0x45;
1492         ip->ip_tos   = 0;
1493         ip->ip_len   = htons(pkt_len);
1494         ip->ip_p     = proto;
1495         ip->ip_id    = htons(net_ip_id++);
1496         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1497         ip->ip_ttl   = 255;
1498         ip->ip_sum   = 0;
1499         /* already in network byte order */
1500         net_copy_ip((void *)&ip->ip_src, &source);
1501         /* already in network byte order */
1502         net_copy_ip((void *)&ip->ip_dst, &dest);
1503
1504         ip->ip_sum   = compute_ip_checksum(ip, IP_HDR_SIZE);
1505 }
1506
1507 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport,
1508                         int len)
1509 {
1510         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1511
1512         /*
1513          *      If the data is an odd number of bytes, zero the
1514          *      byte after the last byte so that the checksum
1515          *      will work.
1516          */
1517         if (len & 1)
1518                 pkt[IP_UDP_HDR_SIZE + len] = 0;
1519
1520         net_set_ip_header(pkt, dest, net_ip, IP_UDP_HDR_SIZE + len,
1521                           IPPROTO_UDP);
1522
1523         ip->udp_src  = htons(sport);
1524         ip->udp_dst  = htons(dport);
1525         ip->udp_len  = htons(UDP_HDR_SIZE + len);
1526         ip->udp_xsum = 0;
1527 }
1528
1529 void copy_filename(char *dst, const char *src, int size)
1530 {
1531         if (src && *src && (*src == '"')) {
1532                 ++src;
1533                 --size;
1534         }
1535
1536         while ((--size > 0) && src && *src && (*src != '"'))
1537                 *dst++ = *src++;
1538         *dst = '\0';
1539 }
1540
1541 int is_serverip_in_cmd(void)
1542 {
1543         return !!strchr(net_boot_file_name, ':');
1544 }
1545
1546 int net_parse_bootfile(struct in_addr *ipaddr, char *filename, int max_len)
1547 {
1548         char *colon;
1549
1550         if (net_boot_file_name[0] == '\0')
1551                 return 0;
1552
1553         colon = strchr(net_boot_file_name, ':');
1554         if (colon) {
1555                 if (ipaddr)
1556                         *ipaddr = string_to_ip(net_boot_file_name);
1557                 strncpy(filename, colon + 1, max_len);
1558         } else {
1559                 strncpy(filename, net_boot_file_name, max_len);
1560         }
1561         filename[max_len - 1] = '\0';
1562
1563         return 1;
1564 }
1565
1566 #if     defined(CONFIG_CMD_NFS)         || \
1567         defined(CONFIG_CMD_SNTP)        || \
1568         defined(CONFIG_CMD_DNS)
1569 /*
1570  * make port a little random (1024-17407)
1571  * This keeps the math somewhat trivial to compute, and seems to work with
1572  * all supported protocols/clients/servers
1573  */
1574 unsigned int random_port(void)
1575 {
1576         return 1024 + (get_timer(0) % 0x4000);
1577 }
1578 #endif
1579
1580 void ip_to_string(struct in_addr x, char *s)
1581 {
1582         x.s_addr = ntohl(x.s_addr);
1583         sprintf(s, "%d.%d.%d.%d",
1584                 (int) ((x.s_addr >> 24) & 0xff),
1585                 (int) ((x.s_addr >> 16) & 0xff),
1586                 (int) ((x.s_addr >> 8) & 0xff),
1587                 (int) ((x.s_addr >> 0) & 0xff)
1588         );
1589 }
1590
1591 void vlan_to_string(ushort x, char *s)
1592 {
1593         x = ntohs(x);
1594
1595         if (x == (ushort)-1)
1596                 x = VLAN_NONE;
1597
1598         if (x == VLAN_NONE)
1599                 strcpy(s, "none");
1600         else
1601                 sprintf(s, "%d", x & VLAN_IDMASK);
1602 }
1603
1604 ushort string_to_vlan(const char *s)
1605 {
1606         ushort id;
1607
1608         if (s == NULL)
1609                 return htons(VLAN_NONE);
1610
1611         if (*s < '0' || *s > '9')
1612                 id = VLAN_NONE;
1613         else
1614                 id = (ushort)simple_strtoul(s, NULL, 10);
1615
1616         return htons(id);
1617 }
1618
1619 ushort env_get_vlan(char *var)
1620 {
1621         return string_to_vlan(env_get(var));
1622 }