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