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  *
  76  * WOL:
  77  *
  78  *      Prerequisites:  - own ethernet address
  79  *      We want:        - magic packet or timeout
  80  *      Next step:      none
  81  */
  82
  83
  84 #include <common.h>
  85 #include <bootstage.h>
  86 #include <command.h>
  87 #include <console.h>
  88 #include <env.h>
  89 #include <env_internal.h>
  90 #include <errno.h>
  91 #include <image.h>
  92 #include <log.h>
  93 #include <net.h>
  94 #include <net/fastboot.h>
  95 #include <net/tftp.h>
  96 #if defined(CONFIG_CMD_PCAP)
  97 #include <net/pcap.h>
  98 #endif
  99 #include <net/udp.h>
 100 #if defined(CONFIG_LED_STATUS)
 101 #include <miiphy.h>
 102 #include <status_led.h>
 103 #endif
 104 #include <watchdog.h>
 105 #include <linux/compiler.h>
 106 #include "arp.h"
 107 #include "bootp.h"
 108 #include "cdp.h"
 109 #if defined(CONFIG_CMD_DNS)
 110 #include "dns.h"
 111 #endif
 112 #include "link_local.h"
 113 #include "nfs.h"
 114 #include "ping.h"
 115 #include "rarp.h"
 116 #if defined(CONFIG_CMD_WOL)
 117 #include "wol.h"
 118 #endif
 119
 120 /** BOOTP EXTENTIONS **/
 121
 122 /* Our subnet mask (0=unknown) */
 123 struct in_addr net_netmask;
 124 /* Our gateways IP address */
 125 struct in_addr net_gateway;
 126 /* Our DNS IP address */
 127 struct in_addr net_dns_server;
 128 #if defined(CONFIG_BOOTP_DNS2)
 129 /* Our 2nd DNS IP address */
 130 struct in_addr net_dns_server2;
 131 #endif
 132
 133 /** END OF BOOTP EXTENTIONS **/
 134
 135 /* Our ethernet address */
 136 u8 net_ethaddr[6];
 137 /* Boot server enet address */
 138 u8 net_server_ethaddr[6];
 139 /* Our IP addr (0 = unknown) */
 140 struct in_addr  net_ip;
 141 /* Server IP addr (0 = unknown) */
 142 struct in_addr  net_server_ip;
 143 /* Current receive packet */
 144 uchar *net_rx_packet;
 145 /* Current rx packet length */
 146 int             net_rx_packet_len;
 147 /* IP packet ID */
 148 static unsigned net_ip_id;
 149 /* Ethernet bcast address */
 150 const u8 net_bcast_ethaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 151 const u8 net_null_ethaddr[6];
 152 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
 153 void (*push_packet)(void *, int len) = 0;
 154 #endif
 155 /* Network loop state */
 156 enum net_loop_state net_state;
 157 /* Tried all network devices */
 158 int             net_restart_wrap;
 159 /* Network loop restarted */
 160 static int      net_restarted;
 161 /* At least one device configured */
 162 static int      net_dev_exists;
 163
 164 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
 165 /* default is without VLAN */
 166 ushort          net_our_vlan = 0xFFFF;
 167 /* ditto */
 168 ushort          net_native_vlan = 0xFFFF;
 169
 170 /* Boot File name */
 171 char net_boot_file_name[1024];
 172 /* Indicates whether the file name was specified on the command line */
 173 bool net_boot_file_name_explicit;
 174 /* The actual transferred size of the bootfile (in bytes) */
 175 u32 net_boot_file_size;
 176 /* Boot file size in blocks as reported by the DHCP server */
 177 u32 net_boot_file_expected_size_in_blocks;
 178
 179 static uchar net_pkt_buf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 180 /* Receive packets */
 181 uchar *net_rx_packets[PKTBUFSRX];
 182 /* Current UDP RX packet handler */
 183 static rxhand_f *udp_packet_handler;
 184 /* Current ARP RX packet handler */
 185 static rxhand_f *arp_packet_handler;
 186 #ifdef CONFIG_CMD_TFTPPUT
 187 /* Current ICMP rx handler */
 188 static rxhand_icmp_f *packet_icmp_handler;
 189 #endif
 190 /* Current timeout handler */
 191 static thand_f *time_handler;
 192 /* Time base value */
 193 static ulong    time_start;
 194 /* Current timeout value */
 195 static ulong    time_delta;
 196 /* THE transmit packet */
 197 uchar *net_tx_packet;
 198
 199 static int net_check_prereq(enum proto_t protocol);
 200
 201 static int net_try_count;
 202
 203 int __maybe_unused net_busy_flag;
 204
 205 /**********************************************************************/
 206
 207 static int on_ipaddr(const char *name, const char *value, enum env_op op,
 208         int flags)
 209 {
 210         if (flags & H_PROGRAMMATIC)
 211                 return 0;
 212
 213         net_ip = string_to_ip(value);
 214
 215         return 0;
 216 }
 217 U_BOOT_ENV_CALLBACK(ipaddr, on_ipaddr);
 218
 219 static int on_gatewayip(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_gateway = string_to_ip(value);
 226
 227         return 0;
 228 }
 229 U_BOOT_ENV_CALLBACK(gatewayip, on_gatewayip);
 230
 231 static int on_netmask(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_netmask = string_to_ip(value);
 238
 239         return 0;
 240 }
 241 U_BOOT_ENV_CALLBACK(netmask, on_netmask);
 242
 243 static int on_serverip(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_server_ip = string_to_ip(value);
 250
 251         return 0;
 252 }
 253 U_BOOT_ENV_CALLBACK(serverip, on_serverip);
 254
 255 static int on_nvlan(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_native_vlan = string_to_vlan(value);
 262
 263         return 0;
 264 }
 265 U_BOOT_ENV_CALLBACK(nvlan, on_nvlan);
 266
 267 static int on_vlan(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_our_vlan = string_to_vlan(value);
 274
 275         return 0;
 276 }
 277 U_BOOT_ENV_CALLBACK(vlan, on_vlan);
 278
 279 #if defined(CONFIG_CMD_DNS)
 280 static int on_dnsip(const char *name, const char *value, enum env_op op,
 281         int flags)
 282 {
 283         if (flags & H_PROGRAMMATIC)
 284                 return 0;
 285
 286         net_dns_server = string_to_ip(value);
 287
 288         return 0;
 289 }
 290 U_BOOT_ENV_CALLBACK(dnsip, on_dnsip);
 291 #endif
 292
 293 /*
 294  * Check if autoload is enabled. If so, use either NFS or TFTP to download
 295  * the boot file.
 296  */
 297 void net_auto_load(void)
 298 {
 299 #if defined(CONFIG_CMD_NFS) && !defined(CONFIG_SPL_BUILD)
 300         const char *s = env_get("autoload");
 301
 302         if (s != NULL && strcmp(s, "NFS") == 0) {
 303                 if (net_check_prereq(NFS)) {
 304 /* We aren't expecting to get a serverip, so just accept the assigned IP */
 305                         if (IS_ENABLED(CONFIG_BOOTP_SERVERIP)) {
 306                                 net_set_state(NETLOOP_SUCCESS);
 307                         } else {
 308                                 printf("Cannot autoload with NFS\n");
 309                                 net_set_state(NETLOOP_FAIL);
 310                         }
 311                         return;
 312                 }
 313                 /*
 314                  * Use NFS to load the bootfile.
 315                  */
 316                 nfs_start();
 317                 return;
 318         }
 319 #endif
 320         if (env_get_yesno("autoload") == 0) {
 321                 /*
 322                  * Just use BOOTP/RARP to configure system;
 323                  * Do not use TFTP to load the bootfile.
 324                  */
 325                 net_set_state(NETLOOP_SUCCESS);
 326                 return;
 327         }
 328         if (net_check_prereq(TFTPGET)) {
 329 /* We aren't expecting to get a serverip, so just accept the assigned IP */
 330                 if (IS_ENABLED(CONFIG_BOOTP_SERVERIP)) {
 331                         net_set_state(NETLOOP_SUCCESS);
 332                 } else {
 333                         printf("Cannot autoload with TFTPGET\n");
 334                         net_set_state(NETLOOP_FAIL);
 335                 }
 336                 return;
 337         }
 338         tftp_start(TFTPGET);
 339 }
 340
 341 static int net_init_loop(void)
 342 {
 343         if (eth_get_dev())
 344                 memcpy(net_ethaddr, eth_get_ethaddr(), 6);
 345         else
 346                 /*
 347                  * Not ideal, but there's no way to get the actual error, and I
 348                  * don't feel like fixing all the users of eth_get_dev to deal
 349                  * with errors.
 350                  */
 351                 return -ENONET;
 352
 353         return 0;
 354 }
 355
 356 static void net_clear_handlers(void)
 357 {
 358         net_set_udp_handler(NULL);
 359         net_set_arp_handler(NULL);
 360         net_set_timeout_handler(0, NULL);
 361 }
 362
 363 static void net_cleanup_loop(void)
 364 {
 365         net_clear_handlers();
 366 }
 367
 368 int net_init(void)
 369 {
 370         static int first_call = 1;
 371
 372         if (first_call) {
 373                 /*
 374                  *      Setup packet buffers, aligned correctly.
 375                  */
 376                 int i;
 377
 378                 net_tx_packet = &net_pkt_buf[0] + (PKTALIGN - 1);
 379                 net_tx_packet -= (ulong)net_tx_packet % PKTALIGN;
 380                 for (i = 0; i < PKTBUFSRX; i++) {
 381                         net_rx_packets[i] = net_tx_packet +
 382                                 (i + 1) * PKTSIZE_ALIGN;
 383                 }
 384                 arp_init();
 385                 net_clear_handlers();
 386
 387                 /* Only need to setup buffer pointers once. */
 388                 first_call = 0;
 389         }
 390
 391         return net_init_loop();
 392 }
 393
 394 /**********************************************************************/
 395 /*
 396  *      Main network processing loop.
 397  */
 398
 399 int net_loop(enum proto_t protocol)
 400 {
 401         int ret = -EINVAL;
 402         enum net_loop_state prev_net_state = net_state;
 403
 404 #if defined(CONFIG_CMD_PING)
 405         if (protocol != PING)
 406                 net_ping_ip.s_addr = 0;
 407 #endif
 408         net_restarted = 0;
 409         net_dev_exists = 0;
 410         net_try_count = 1;
 411         debug_cond(DEBUG_INT_STATE, "--- net_loop Entry\n");
 412
 413         bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
 414         net_init();
 415         if (eth_is_on_demand_init()) {
 416                 eth_halt();
 417                 eth_set_current();
 418                 ret = eth_init();
 419                 if (ret < 0) {
 420                         eth_halt();
 421                         return ret;
 422                 }
 423         } else {
 424                 eth_init_state_only();
 425         }
 426 restart:
 427 #ifdef CONFIG_USB_KEYBOARD
 428         net_busy_flag = 0;
 429 #endif
 430         net_set_state(NETLOOP_CONTINUE);
 431
 432         /*
 433          *      Start the ball rolling with the given start function.  From
 434          *      here on, this code is a state machine driven by received
 435          *      packets and timer events.
 436          */
 437         debug_cond(DEBUG_INT_STATE, "--- net_loop Init\n");
 438         net_init_loop();
 439
 440         switch (net_check_prereq(protocol)) {
 441         case 1:
 442                 /* network not configured */
 443                 eth_halt();
 444                 net_set_state(prev_net_state);
 445                 return -ENODEV;
 446
 447         case 2:
 448                 /* network device not configured */
 449                 break;
 450
 451         case 0:
 452                 net_dev_exists = 1;
 453                 net_boot_file_size = 0;
 454                 switch (protocol) {
 455 #ifdef CONFIG_CMD_TFTPBOOT
 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 #endif
 464 #ifdef CONFIG_CMD_TFTPSRV
 465                 case TFTPSRV:
 466                         tftp_start_server();
 467                         break;
 468 #endif
 469 #ifdef CONFIG_UDP_FUNCTION_FASTBOOT
 470                 case FASTBOOT:
 471                         fastboot_start_server();
 472                         break;
 473 #endif
 474 #if defined(CONFIG_CMD_DHCP)
 475                 case DHCP:
 476                         bootp_reset();
 477                         net_ip.s_addr = 0;
 478                         dhcp_request();         /* Basically same as BOOTP */
 479                         break;
 480 #endif
 481 #if defined(CONFIG_CMD_BOOTP)
 482                 case BOOTP:
 483                         bootp_reset();
 484                         net_ip.s_addr = 0;
 485                         bootp_request();
 486                         break;
 487 #endif
 488 #if defined(CONFIG_CMD_RARP)
 489                 case RARP:
 490                         rarp_try = 0;
 491                         net_ip.s_addr = 0;
 492                         rarp_request();
 493                         break;
 494 #endif
 495 #if defined(CONFIG_CMD_PING)
 496                 case PING:
 497                         ping_start();
 498                         break;
 499 #endif
 500 #if defined(CONFIG_CMD_NFS) && !defined(CONFIG_SPL_BUILD)
 501                 case NFS:
 502                         nfs_start();
 503                         break;
 504 #endif
 505 #if defined(CONFIG_CMD_CDP)
 506                 case CDP:
 507                         cdp_start();
 508                         break;
 509 #endif
 510 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
 511                 case NETCONS:
 512                         nc_start();
 513                         break;
 514 #endif
 515 #if defined(CONFIG_CMD_DNS)
 516                 case DNS:
 517                         dns_start();
 518                         break;
 519 #endif
 520 #if defined(CONFIG_CMD_LINK_LOCAL)
 521                 case LINKLOCAL:
 522                         link_local_start();
 523                         break;
 524 #endif
 525 #if defined(CONFIG_CMD_WOL)
 526                 case WOL:
 527                         wol_start();
 528                         break;
 529 #endif
 530                 default:
 531                         break;
 532                 }
 533
 534                 if (IS_ENABLED(CONFIG_PROT_UDP) && protocol == UDP)
 535                         udp_start();
 536
 537                 break;
 538         }
 539
 540 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 541 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 542         defined(CONFIG_LED_STATUS)                      && \
 543         defined(CONFIG_LED_STATUS_RED)
 544         /*
 545          * Echo the inverted link state to the fault LED.
 546          */
 547         if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
 548                 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_OFF);
 549         else
 550                 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_ON);
 551 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 552 #endif /* CONFIG_MII, ... */
 553 #ifdef CONFIG_USB_KEYBOARD
 554         net_busy_flag = 1;
 555 #endif
 556
 557         /*
 558          *      Main packet reception loop.  Loop receiving packets until
 559          *      someone sets `net_state' to a state that terminates.
 560          */
 561         for (;;) {
 562                 WATCHDOG_RESET();
 563                 if (arp_timeout_check() > 0)
 564                         time_start = get_timer(0);
 565
 566                 /*
 567                  *      Check the ethernet for a new packet.  The ethernet
 568                  *      receive routine will process it.
 569                  *      Most drivers return the most recent packet size, but not
 570                  *      errors that may have happened.
 571                  */
 572                 eth_rx();
 573
 574                 /*
 575                  *      Abort if ctrl-c was pressed.
 576                  */
 577                 if (ctrlc()) {
 578                         /* cancel any ARP that may not have completed */
 579                         net_arp_wait_packet_ip.s_addr = 0;
 580
 581                         net_cleanup_loop();
 582                         eth_halt();
 583                         /* Invalidate the last protocol */
 584                         eth_set_last_protocol(BOOTP);
 585
 586                         puts("\nAbort\n");
 587                         /* include a debug print as well incase the debug
 588                            messages are directed to stderr */
 589                         debug_cond(DEBUG_INT_STATE, "--- net_loop Abort!\n");
 590                         ret = -EINTR;
 591                         goto done;
 592                 }
 593
 594                 /*
 595                  *      Check for a timeout, and run the timeout handler
 596                  *      if we have one.
 597                  */
 598                 if (time_handler &&
 599                     ((get_timer(0) - time_start) > time_delta)) {
 600                         thand_f *x;
 601
 602 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 603 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 604         defined(CONFIG_LED_STATUS)                      && \
 605         defined(CONFIG_LED_STATUS_RED)
 606                         /*
 607                          * Echo the inverted link state to the fault LED.
 608                          */
 609                         if (miiphy_link(eth_get_dev()->name,
 610                                         CONFIG_SYS_FAULT_MII_ADDR))
 611                                 status_led_set(CONFIG_LED_STATUS_RED,
 612                                                CONFIG_LED_STATUS_OFF);
 613                         else
 614                                 status_led_set(CONFIG_LED_STATUS_RED,
 615                                                CONFIG_LED_STATUS_ON);
 616 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 617 #endif /* CONFIG_MII, ... */
 618                         debug_cond(DEBUG_INT_STATE, "--- net_loop timeout\n");
 619                         x = time_handler;
 620                         time_handler = (thand_f *)0;
 621                         (*x)();
 622                 }
 623
 624                 if (net_state == NETLOOP_FAIL)
 625                         ret = net_start_again();
 626
 627                 switch (net_state) {
 628                 case NETLOOP_RESTART:
 629                         net_restarted = 1;
 630                         goto restart;
 631
 632                 case NETLOOP_SUCCESS:
 633                         net_cleanup_loop();
 634                         if (net_boot_file_size > 0) {
 635                                 printf("Bytes transferred = %d (%x hex)\n",
 636                                        net_boot_file_size, net_boot_file_size);
 637                                 env_set_hex("filesize", net_boot_file_size);
 638                                 env_set_hex("fileaddr", image_load_addr);
 639                         }
 640                         if (protocol != NETCONS)
 641                                 eth_halt();
 642                         else
 643                                 eth_halt_state_only();
 644
 645                         eth_set_last_protocol(protocol);
 646
 647                         ret = net_boot_file_size;
 648                         debug_cond(DEBUG_INT_STATE, "--- net_loop Success!\n");
 649                         goto done;
 650
 651                 case NETLOOP_FAIL:
 652                         net_cleanup_loop();
 653                         /* Invalidate the last protocol */
 654                         eth_set_last_protocol(BOOTP);
 655                         debug_cond(DEBUG_INT_STATE, "--- net_loop Fail!\n");
 656                         ret = -ENONET;
 657                         goto done;
 658
 659                 case NETLOOP_CONTINUE:
 660                         continue;
 661                 }
 662         }
 663
 664 done:
 665 #ifdef CONFIG_USB_KEYBOARD
 666         net_busy_flag = 0;
 667 #endif
 668 #ifdef CONFIG_CMD_TFTPPUT
 669         /* Clear out the handlers */
 670         net_set_udp_handler(NULL);
 671         net_set_icmp_handler(NULL);
 672 #endif
 673         net_set_state(prev_net_state);
 674
 675 #if defined(CONFIG_CMD_PCAP)
 676         if (pcap_active())
 677                 pcap_print_status();
 678 #endif
 679         return ret;
 680 }
 681
 682 /**********************************************************************/
 683
 684 static void start_again_timeout_handler(void)
 685 {
 686         net_set_state(NETLOOP_RESTART);
 687 }
 688
 689 int net_start_again(void)
 690 {
 691         char *nretry;
 692         int retry_forever = 0;
 693         unsigned long retrycnt = 0;
 694         int ret;
 695
 696         nretry = env_get("netretry");
 697         if (nretry) {
 698                 if (!strcmp(nretry, "yes"))
 699                         retry_forever = 1;
 700                 else if (!strcmp(nretry, "no"))
 701                         retrycnt = 0;
 702                 else if (!strcmp(nretry, "once"))
 703                         retrycnt = 1;
 704                 else
 705                         retrycnt = simple_strtoul(nretry, NULL, 0);
 706         } else {
 707                 retrycnt = 0;
 708                 retry_forever = 0;
 709         }
 710
 711         if ((!retry_forever) && (net_try_count > retrycnt)) {
 712                 eth_halt();
 713                 net_set_state(NETLOOP_FAIL);
 714                 /*
 715                  * We don't provide a way for the protocol to return an error,
 716                  * but this is almost always the reason.
 717                  */
 718                 return -ETIMEDOUT;
 719         }
 720
 721         net_try_count++;
 722
 723         eth_halt();
 724 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
 725         eth_try_another(!net_restarted);
 726 #endif
 727         ret = eth_init();
 728         if (net_restart_wrap) {
 729                 net_restart_wrap = 0;
 730                 if (net_dev_exists) {
 731                         net_set_timeout_handler(10000UL,
 732                                                 start_again_timeout_handler);
 733                         net_set_udp_handler(NULL);
 734                 } else {
 735                         net_set_state(NETLOOP_FAIL);
 736                 }
 737         } else {
 738                 net_set_state(NETLOOP_RESTART);
 739         }
 740         return ret;
 741 }
 742
 743 /**********************************************************************/
 744 /*
 745  *      Miscelaneous bits.
 746  */
 747
 748 static void dummy_handler(uchar *pkt, unsigned dport,
 749                         struct in_addr sip, unsigned sport,
 750                         unsigned len)
 751 {
 752 }
 753
 754 rxhand_f *net_get_udp_handler(void)
 755 {
 756         return udp_packet_handler;
 757 }
 758
 759 void net_set_udp_handler(rxhand_f *f)
 760 {
 761         debug_cond(DEBUG_INT_STATE, "--- net_loop UDP handler set (%p)\n", f);
 762         if (f == NULL)
 763                 udp_packet_handler = dummy_handler;
 764         else
 765                 udp_packet_handler = f;
 766 }
 767
 768 rxhand_f *net_get_arp_handler(void)
 769 {
 770         return arp_packet_handler;
 771 }
 772
 773 void net_set_arp_handler(rxhand_f *f)
 774 {
 775         debug_cond(DEBUG_INT_STATE, "--- net_loop ARP handler set (%p)\n", f);
 776         if (f == NULL)
 777                 arp_packet_handler = dummy_handler;
 778         else
 779                 arp_packet_handler = f;
 780 }
 781
 782 #ifdef CONFIG_CMD_TFTPPUT
 783 void net_set_icmp_handler(rxhand_icmp_f *f)
 784 {
 785         packet_icmp_handler = f;
 786 }
 787 #endif
 788
 789 void net_set_timeout_handler(ulong iv, thand_f *f)
 790 {
 791         if (iv == 0) {
 792                 debug_cond(DEBUG_INT_STATE,
 793                            "--- net_loop timeout handler cancelled\n");
 794                 time_handler = (thand_f *)0;
 795         } else {
 796                 debug_cond(DEBUG_INT_STATE,
 797                            "--- net_loop timeout handler set (%p)\n", f);
 798                 time_handler = f;
 799                 time_start = get_timer(0);
 800                 time_delta = iv * CONFIG_SYS_HZ / 1000;
 801         }
 802 }
 803
 804 uchar *net_get_async_tx_pkt_buf(void)
 805 {
 806         if (arp_is_waiting())
 807                 return arp_tx_packet; /* If we are waiting, we already sent */
 808         else
 809                 return net_tx_packet;
 810 }
 811
 812 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
 813                 int payload_len)
 814 {
 815         return net_send_ip_packet(ether, dest, dport, sport, payload_len,
 816                                   IPPROTO_UDP, 0, 0, 0);
 817 }
 818
 819 int net_send_ip_packet(uchar *ether, struct in_addr dest, int dport, int sport,
 820                        int payload_len, int proto, u8 action, u32 tcp_seq_num,
 821                        u32 tcp_ack_num)
 822 {
 823         uchar *pkt;
 824         int eth_hdr_size;
 825         int pkt_hdr_size;
 826
 827         /* make sure the net_tx_packet is initialized (net_init() was called) */
 828         assert(net_tx_packet != NULL);
 829         if (net_tx_packet == NULL)
 830                 return -1;
 831
 832         /* convert to new style broadcast */
 833         if (dest.s_addr == 0)
 834                 dest.s_addr = 0xFFFFFFFF;
 835
 836         /* if broadcast, make the ether address a broadcast and don't do ARP */
 837         if (dest.s_addr == 0xFFFFFFFF)
 838                 ether = (uchar *)net_bcast_ethaddr;
 839
 840         pkt = (uchar *)net_tx_packet;
 841
 842         eth_hdr_size = net_set_ether(pkt, ether, PROT_IP);
 843
 844         switch (proto) {
 845         case IPPROTO_UDP:
 846                 net_set_udp_header(pkt + eth_hdr_size, dest, dport, sport,
 847                                    payload_len);
 848                 pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
 849                 break;
 850         default:
 851                 return -EINVAL;
 852         }
 853
 854         /* if MAC address was not discovered yet, do an ARP request */
 855         if (memcmp(ether, net_null_ethaddr, 6) == 0) {
 856                 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest);
 857
 858                 /* save the ip and eth addr for the packet to send after arp */
 859                 net_arp_wait_packet_ip = dest;
 860                 arp_wait_packet_ethaddr = ether;
 861
 862                 /* size of the waiting packet */
 863                 arp_wait_tx_packet_size = pkt_hdr_size + payload_len;
 864
 865                 /* and do the ARP request */
 866                 arp_wait_try = 1;
 867                 arp_wait_timer_start = get_timer(0);
 868                 arp_request();
 869                 return 1;       /* waiting */
 870         } else {
 871                 debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
 872                            &dest, ether);
 873                 net_send_packet(net_tx_packet, pkt_hdr_size + payload_len);
 874                 return 0;       /* transmitted */
 875         }
 876 }
 877
 878 #ifdef CONFIG_IP_DEFRAG
 879 /*
 880  * This function collects fragments in a single packet, according
 881  * to the algorithm in RFC815. It returns NULL or the pointer to
 882  * a complete packet, in static storage
 883  */
 884 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG)
 885
 886 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE)
 887
 888 /*
 889  * this is the packet being assembled, either data or frag control.
 890  * Fragments go by 8 bytes, so this union must be 8 bytes long
 891  */
 892 struct hole {
 893         /* first_byte is address of this structure */
 894         u16 last_byte;  /* last byte in this hole + 1 (begin of next hole) */
 895         u16 next_hole;  /* index of next (in 8-b blocks), 0 == none */
 896         u16 prev_hole;  /* index of prev, 0 == none */
 897         u16 unused;
 898 };
 899
 900 static struct ip_udp_hdr *__net_defragment(struct ip_udp_hdr *ip, int *lenp)
 901 {
 902         static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
 903         static u16 first_hole, total_len;
 904         struct hole *payload, *thisfrag, *h, *newh;
 905         struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff;
 906         uchar *indata = (uchar *)ip;
 907         int offset8, start, len, done = 0;
 908         u16 ip_off = ntohs(ip->ip_off);
 909
 910         /* payload starts after IP header, this fragment is in there */
 911         payload = (struct hole *)(pkt_buff + IP_HDR_SIZE);
 912         offset8 =  (ip_off & IP_OFFS);
 913         thisfrag = payload + offset8;
 914         start = offset8 * 8;
 915         len = ntohs(ip->ip_len) - IP_HDR_SIZE;
 916
 917         if (start + len > IP_MAXUDP) /* fragment extends too far */
 918                 return NULL;
 919
 920         if (!total_len || localip->ip_id != ip->ip_id) {
 921                 /* new (or different) packet, reset structs */
 922                 total_len = 0xffff;
 923                 payload[0].last_byte = ~0;
 924                 payload[0].next_hole = 0;
 925                 payload[0].prev_hole = 0;
 926                 first_hole = 0;
 927                 /* any IP header will work, copy the first we received */
 928                 memcpy(localip, ip, IP_HDR_SIZE);
 929         }
 930
 931         /*
 932          * What follows is the reassembly algorithm. We use the payload
 933          * array as a linked list of hole descriptors, as each hole starts
 934          * at a multiple of 8 bytes. However, last byte can be whatever value,
 935          * so it is represented as byte count, not as 8-byte blocks.
 936          */
 937
 938         h = payload + first_hole;
 939         while (h->last_byte < start) {
 940                 if (!h->next_hole) {
 941                         /* no hole that far away */
 942                         return NULL;
 943                 }
 944                 h = payload + h->next_hole;
 945         }
 946
 947         /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
 948         if (offset8 + ((len + 7) / 8) <= h - payload) {
 949                 /* no overlap with holes (dup fragment?) */
 950                 return NULL;
 951         }
 952
 953         if (!(ip_off & IP_FLAGS_MFRAG)) {
 954                 /* no more fragmentss: truncate this (last) hole */
 955                 total_len = start + len;
 956                 h->last_byte = start + len;
 957         }
 958
 959         /*
 960          * There is some overlap: fix the hole list. This code doesn't
 961          * deal with a fragment that overlaps with two different holes
 962          * (thus being a superset of a previously-received fragment).
 963          */
 964
 965         if ((h >= thisfrag) && (h->last_byte <= start + len)) {
 966                 /* complete overlap with hole: remove hole */
 967                 if (!h->prev_hole && !h->next_hole) {
 968                         /* last remaining hole */
 969                         done = 1;
 970                 } else if (!h->prev_hole) {
 971                         /* first hole */
 972                         first_hole = h->next_hole;
 973                         payload[h->next_hole].prev_hole = 0;
 974                 } else if (!h->next_hole) {
 975                         /* last hole */
 976                         payload[h->prev_hole].next_hole = 0;
 977                 } else {
 978                         /* in the middle of the list */
 979                         payload[h->next_hole].prev_hole = h->prev_hole;
 980                         payload[h->prev_hole].next_hole = h->next_hole;
 981                 }
 982
 983         } else if (h->last_byte <= start + len) {
 984                 /* overlaps with final part of the hole: shorten this hole */
 985                 h->last_byte = start;
 986
 987         } else if (h >= thisfrag) {
 988                 /* overlaps with initial part of the hole: move this hole */
 989                 newh = thisfrag + (len / 8);
 990                 *newh = *h;
 991                 h = newh;
 992                 if (h->next_hole)
 993                         payload[h->next_hole].prev_hole = (h - payload);
 994                 if (h->prev_hole)
 995                         payload[h->prev_hole].next_hole = (h - payload);
 996                 else
 997                         first_hole = (h - payload);
 998
 999         } else {
1000                 /* fragment sits in the middle: split the hole */
1001                 newh = thisfrag + (len / 8);
1002                 *newh = *h;
1003                 h->last_byte = start;
1004                 h->next_hole = (newh - payload);
1005                 newh->prev_hole = (h - payload);
1006                 if (newh->next_hole)
1007                         payload[newh->next_hole].prev_hole = (newh - payload);
1008         }
1009
1010         /* finally copy this fragment and possibly return whole packet */
1011         memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len);
1012         if (!done)
1013                 return NULL;
1014
1015         localip->ip_len = htons(total_len);
1016         *lenp = total_len + IP_HDR_SIZE;
1017         return localip;
1018 }
1019
1020 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
1021         int *lenp)
1022 {
1023         u16 ip_off = ntohs(ip->ip_off);
1024         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1025                 return ip; /* not a fragment */
1026         return __net_defragment(ip, lenp);
1027 }
1028
1029 #else /* !CONFIG_IP_DEFRAG */
1030
1031 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
1032         int *lenp)
1033 {
1034         u16 ip_off = ntohs(ip->ip_off);
1035         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1036                 return ip; /* not a fragment */
1037         return NULL;
1038 }
1039 #endif
1040
1041 /**
1042  * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
1043  * drop others.
1044  *
1045  * @parma ip    IP packet containing the ICMP
1046  */
1047 static void receive_icmp(struct ip_udp_hdr *ip, int len,
1048                         struct in_addr src_ip, struct ethernet_hdr *et)
1049 {
1050         struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
1051
1052         switch (icmph->type) {
1053         case ICMP_REDIRECT:
1054                 if (icmph->code != ICMP_REDIR_HOST)
1055                         return;
1056                 printf(" ICMP Host Redirect to %pI4 ",
1057                        &icmph->un.gateway);
1058                 break;
1059         default:
1060 #if defined(CONFIG_CMD_PING)
1061                 ping_receive(et, ip, len);
1062 #endif
1063 #ifdef CONFIG_CMD_TFTPPUT
1064                 if (packet_icmp_handler)
1065                         packet_icmp_handler(icmph->type, icmph->code,
1066                                             ntohs(ip->udp_dst), src_ip,
1067                                             ntohs(ip->udp_src), icmph->un.data,
1068                                             ntohs(ip->udp_len));
1069 #endif
1070                 break;
1071         }
1072 }
1073
1074 void net_process_received_packet(uchar *in_packet, int len)
1075 {
1076         struct ethernet_hdr *et;
1077         struct ip_udp_hdr *ip;
1078         struct in_addr dst_ip;
1079         struct in_addr src_ip;
1080         int eth_proto;
1081 #if defined(CONFIG_CMD_CDP)
1082         int iscdp;
1083 #endif
1084         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1085
1086         debug_cond(DEBUG_NET_PKT, "packet received\n");
1087
1088 #if defined(CONFIG_CMD_PCAP)
1089         pcap_post(in_packet, len, false);
1090 #endif
1091         net_rx_packet = in_packet;
1092         net_rx_packet_len = len;
1093         et = (struct ethernet_hdr *)in_packet;
1094
1095         /* too small packet? */
1096         if (len < ETHER_HDR_SIZE)
1097                 return;
1098
1099 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
1100         if (push_packet) {
1101                 (*push_packet)(in_packet, len);
1102                 return;
1103         }
1104 #endif
1105
1106 #if defined(CONFIG_CMD_CDP)
1107         /* keep track if packet is CDP */
1108         iscdp = is_cdp_packet(et->et_dest);
1109 #endif
1110
1111         myvlanid = ntohs(net_our_vlan);
1112         if (myvlanid == (ushort)-1)
1113                 myvlanid = VLAN_NONE;
1114         mynvlanid = ntohs(net_native_vlan);
1115         if (mynvlanid == (ushort)-1)
1116                 mynvlanid = VLAN_NONE;
1117
1118         eth_proto = ntohs(et->et_protlen);
1119
1120         if (eth_proto < 1514) {
1121                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1122                 /*
1123                  *      Got a 802.2 packet.  Check the other protocol field.
1124                  *      XXX VLAN over 802.2+SNAP not implemented!
1125                  */
1126                 eth_proto = ntohs(et802->et_prot);
1127
1128                 ip = (struct ip_udp_hdr *)(in_packet + E802_HDR_SIZE);
1129                 len -= E802_HDR_SIZE;
1130
1131         } else if (eth_proto != PROT_VLAN) {    /* normal packet */
1132                 ip = (struct ip_udp_hdr *)(in_packet + ETHER_HDR_SIZE);
1133                 len -= ETHER_HDR_SIZE;
1134
1135         } else {                        /* VLAN packet */
1136                 struct vlan_ethernet_hdr *vet =
1137                         (struct vlan_ethernet_hdr *)et;
1138
1139                 debug_cond(DEBUG_NET_PKT, "VLAN packet received\n");
1140
1141                 /* too small packet? */
1142                 if (len < VLAN_ETHER_HDR_SIZE)
1143                         return;
1144
1145                 /* if no VLAN active */
1146                 if ((ntohs(net_our_vlan) & VLAN_IDMASK) == VLAN_NONE
1147 #if defined(CONFIG_CMD_CDP)
1148                                 && iscdp == 0
1149 #endif
1150                                 )
1151                         return;
1152
1153                 cti = ntohs(vet->vet_tag);
1154                 vlanid = cti & VLAN_IDMASK;
1155                 eth_proto = ntohs(vet->vet_type);
1156
1157                 ip = (struct ip_udp_hdr *)(in_packet + VLAN_ETHER_HDR_SIZE);
1158                 len -= VLAN_ETHER_HDR_SIZE;
1159         }
1160
1161         debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto);
1162
1163 #if defined(CONFIG_CMD_CDP)
1164         if (iscdp) {
1165                 cdp_receive((uchar *)ip, len);
1166                 return;
1167         }
1168 #endif
1169
1170         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1171                 if (vlanid == VLAN_NONE)
1172                         vlanid = (mynvlanid & VLAN_IDMASK);
1173                 /* not matched? */
1174                 if (vlanid != (myvlanid & VLAN_IDMASK))
1175                         return;
1176         }
1177
1178         switch (eth_proto) {
1179         case PROT_ARP:
1180                 arp_receive(et, ip, len);
1181                 break;
1182
1183 #ifdef CONFIG_CMD_RARP
1184         case PROT_RARP:
1185                 rarp_receive(ip, len);
1186                 break;
1187 #endif
1188         case PROT_IP:
1189                 debug_cond(DEBUG_NET_PKT, "Got IP\n");
1190                 /* Before we start poking the header, make sure it is there */
1191                 if (len < IP_UDP_HDR_SIZE) {
1192                         debug("len bad %d < %lu\n", len,
1193                               (ulong)IP_UDP_HDR_SIZE);
1194                         return;
1195                 }
1196                 /* Check the packet length */
1197                 if (len < ntohs(ip->ip_len)) {
1198                         debug("len bad %d < %d\n", len, ntohs(ip->ip_len));
1199                         return;
1200                 }
1201                 len = ntohs(ip->ip_len);
1202                 debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n",
1203                            len, ip->ip_hl_v & 0xff);
1204
1205                 /* Can't deal with anything except IPv4 */
1206                 if ((ip->ip_hl_v & 0xf0) != 0x40)
1207                         return;
1208                 /* Can't deal with IP options (headers != 20 bytes) */
1209                 if ((ip->ip_hl_v & 0x0f) > 0x05)
1210                         return;
1211                 /* Check the Checksum of the header */
1212                 if (!ip_checksum_ok((uchar *)ip, IP_HDR_SIZE)) {
1213                         debug("checksum bad\n");
1214                         return;
1215                 }
1216                 /* If it is not for us, ignore it */
1217                 dst_ip = net_read_ip(&ip->ip_dst);
1218                 if (net_ip.s_addr && dst_ip.s_addr != net_ip.s_addr &&
1219                     dst_ip.s_addr != 0xFFFFFFFF) {
1220                                 return;
1221                 }
1222                 /* Read source IP address for later use */
1223                 src_ip = net_read_ip(&ip->ip_src);
1224                 /*
1225                  * The function returns the unchanged packet if it's not
1226                  * a fragment, and either the complete packet or NULL if
1227                  * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1228                  */
1229                 ip = net_defragment(ip, &len);
1230                 if (!ip)
1231                         return;
1232                 /*
1233                  * watch for ICMP host redirects
1234                  *
1235                  * There is no real handler code (yet). We just watch
1236                  * for ICMP host redirect messages. In case anybody
1237                  * sees these messages: please contact me
1238                  * (wd@denx.de), or - even better - send me the
1239                  * necessary fixes :-)
1240                  *
1241                  * Note: in all cases where I have seen this so far
1242                  * it was a problem with the router configuration,
1243                  * for instance when a router was configured in the
1244                  * BOOTP reply, but the TFTP server was on the same
1245                  * subnet. So this is probably a warning that your
1246                  * configuration might be wrong. But I'm not really
1247                  * sure if there aren't any other situations.
1248                  *
1249                  * Simon Glass <sjg@chromium.org>: We get an ICMP when
1250                  * we send a tftp packet to a dead connection, or when
1251                  * there is no server at the other end.
1252                  */
1253                 if (ip->ip_p == IPPROTO_ICMP) {
1254                         receive_icmp(ip, len, src_ip, et);
1255                         return;
1256                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1257                         return;
1258                 }
1259
1260                 if (ntohs(ip->udp_len) < UDP_HDR_SIZE || ntohs(ip->udp_len) > ntohs(ip->ip_len))
1261                         return;
1262
1263                 debug_cond(DEBUG_DEV_PKT,
1264                            "received UDP (to=%pI4, from=%pI4, len=%d)\n",
1265                            &dst_ip, &src_ip, len);
1266
1267                 if (IS_ENABLED(CONFIG_UDP_CHECKSUM) && ip->udp_xsum != 0) {
1268                         ulong   xsum;
1269                         u8 *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 = (u8 *)&ip->udp_src;
1281
1282                         while (sumlen > 1) {
1283                                 /* inlined ntohs() to avoid alignment errors */
1284                                 xsum += (sumptr[0] << 8) + sumptr[1];
1285                                 sumptr += 2;
1286                                 sumlen -= 2;
1287                         }
1288                         if (sumlen > 0)
1289                                 xsum += (sumptr[0] << 8) + sumptr[0];
1290                         while ((xsum >> 16) != 0) {
1291                                 xsum = (xsum & 0x0000ffff) +
1292                                        ((xsum >> 16) & 0x0000ffff);
1293                         }
1294                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1295                                 printf(" UDP wrong checksum %08lx %08x\n",
1296                                        xsum, ntohs(ip->udp_xsum));
1297                                 return;
1298                         }
1299                 }
1300
1301 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
1302                 nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
1303                                 src_ip,
1304                                 ntohs(ip->udp_dst),
1305                                 ntohs(ip->udp_src),
1306                                 ntohs(ip->udp_len) - UDP_HDR_SIZE);
1307 #endif
1308                 /*
1309                  * IP header OK.  Pass the packet to the current handler.
1310                  */
1311                 (*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE,
1312                                       ntohs(ip->udp_dst),
1313                                       src_ip,
1314                                       ntohs(ip->udp_src),
1315                                       ntohs(ip->udp_len) - UDP_HDR_SIZE);
1316                 break;
1317 #ifdef CONFIG_CMD_WOL
1318         case PROT_WOL:
1319                 wol_receive(ip, len);
1320                 break;
1321 #endif
1322         }
1323 }
1324
1325 /**********************************************************************/
1326
1327 static int net_check_prereq(enum proto_t protocol)
1328 {
1329         switch (protocol) {
1330                 /* Fall through */
1331 #if defined(CONFIG_CMD_PING)
1332         case PING:
1333                 if (net_ping_ip.s_addr == 0) {
1334                         puts("*** ERROR: ping address not given\n");
1335                         return 1;
1336                 }
1337                 goto common;
1338 #endif
1339 #if defined(CONFIG_CMD_DNS)
1340         case DNS:
1341                 if (net_dns_server.s_addr == 0) {
1342                         puts("*** ERROR: DNS server address not given\n");
1343                         return 1;
1344                 }
1345                 goto common;
1346 #endif
1347 #if defined(CONFIG_PROT_UDP)
1348         case UDP:
1349                 if (udp_prereq())
1350                         return 1;
1351                 goto common;
1352 #endif
1353
1354 #if defined(CONFIG_CMD_NFS)
1355         case NFS:
1356 #endif
1357                 /* Fall through */
1358         case TFTPGET:
1359         case TFTPPUT:
1360                 if (net_server_ip.s_addr == 0 && !is_serverip_in_cmd()) {
1361                         puts("*** ERROR: `serverip' not set\n");
1362                         return 1;
1363                 }
1364 #if     defined(CONFIG_CMD_PING) || \
1365         defined(CONFIG_CMD_DNS) || defined(CONFIG_PROT_UDP)
1366 common:
1367 #endif
1368                 /* Fall through */
1369
1370         case NETCONS:
1371         case FASTBOOT:
1372         case TFTPSRV:
1373                 if (net_ip.s_addr == 0) {
1374                         puts("*** ERROR: `ipaddr' not set\n");
1375                         return 1;
1376                 }
1377                 /* Fall through */
1378
1379 #ifdef CONFIG_CMD_RARP
1380         case RARP:
1381 #endif
1382         case BOOTP:
1383         case CDP:
1384         case DHCP:
1385         case LINKLOCAL:
1386                 if (memcmp(net_ethaddr, "\0\0\0\0\0\0", 6) == 0) {
1387                         int num = eth_get_dev_index();
1388
1389                         switch (num) {
1390                         case -1:
1391                                 puts("*** ERROR: No ethernet found.\n");
1392                                 return 1;
1393                         case 0:
1394                                 puts("*** ERROR: `ethaddr' not set\n");
1395                                 break;
1396                         default:
1397                                 printf("*** ERROR: `eth%daddr' not set\n",
1398                                        num);
1399                                 break;
1400                         }
1401
1402                         net_start_again();
1403                         return 2;
1404                 }
1405                 /* Fall through */
1406         default:
1407                 return 0;
1408         }
1409         return 0;               /* OK */
1410 }
1411 /**********************************************************************/
1412
1413 int
1414 net_eth_hdr_size(void)
1415 {
1416         ushort myvlanid;
1417
1418         myvlanid = ntohs(net_our_vlan);
1419         if (myvlanid == (ushort)-1)
1420                 myvlanid = VLAN_NONE;
1421
1422         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1423                 VLAN_ETHER_HDR_SIZE;
1424 }
1425
1426 int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot)
1427 {
1428         struct ethernet_hdr *et = (struct ethernet_hdr *)xet;
1429         ushort myvlanid;
1430
1431         myvlanid = ntohs(net_our_vlan);
1432         if (myvlanid == (ushort)-1)
1433                 myvlanid = VLAN_NONE;
1434
1435         memcpy(et->et_dest, dest_ethaddr, 6);
1436         memcpy(et->et_src, net_ethaddr, 6);
1437         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1438                 et->et_protlen = htons(prot);
1439                 return ETHER_HDR_SIZE;
1440         } else {
1441                 struct vlan_ethernet_hdr *vet =
1442                         (struct vlan_ethernet_hdr *)xet;
1443
1444                 vet->vet_vlan_type = htons(PROT_VLAN);
1445                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1446                 vet->vet_type = htons(prot);
1447                 return VLAN_ETHER_HDR_SIZE;
1448         }
1449 }
1450
1451 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
1452 {
1453         ushort protlen;
1454
1455         memcpy(et->et_dest, addr, 6);
1456         memcpy(et->et_src, net_ethaddr, 6);
1457         protlen = ntohs(et->et_protlen);
1458         if (protlen == PROT_VLAN) {
1459                 struct vlan_ethernet_hdr *vet =
1460                         (struct vlan_ethernet_hdr *)et;
1461                 vet->vet_type = htons(prot);
1462                 return VLAN_ETHER_HDR_SIZE;
1463         } else if (protlen > 1514) {
1464                 et->et_protlen = htons(prot);
1465                 return ETHER_HDR_SIZE;
1466         } else {
1467                 /* 802.2 + SNAP */
1468                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1469                 et802->et_prot = htons(prot);
1470                 return E802_HDR_SIZE;
1471         }
1472 }
1473
1474 void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source,
1475                        u16 pkt_len, u8 proto)
1476 {
1477         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1478
1479         /*
1480          *      Construct an IP header.
1481          */
1482         /* IP_HDR_SIZE / 4 (not including UDP) */
1483         ip->ip_hl_v  = 0x45;
1484         ip->ip_tos   = 0;
1485         ip->ip_len   = htons(pkt_len);
1486         ip->ip_p     = proto;
1487         ip->ip_id    = htons(net_ip_id++);
1488         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1489         ip->ip_ttl   = 255;
1490         ip->ip_sum   = 0;
1491         /* already in network byte order */
1492         net_copy_ip((void *)&ip->ip_src, &source);
1493         /* already in network byte order */
1494         net_copy_ip((void *)&ip->ip_dst, &dest);
1495
1496         ip->ip_sum   = compute_ip_checksum(ip, IP_HDR_SIZE);
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, IP_UDP_HDR_SIZE + len,
1513                           IPPROTO_UDP);
1514
1515         ip->udp_src  = htons(sport);
1516         ip->udp_dst  = htons(dport);
1517         ip->udp_len  = htons(UDP_HDR_SIZE + len);
1518         ip->udp_xsum = 0;
1519 }
1520
1521 void copy_filename(char *dst, const char *src, int size)
1522 {
1523         if (src && *src && (*src == '"')) {
1524                 ++src;
1525                 --size;
1526         }
1527
1528         while ((--size > 0) && src && *src && (*src != '"'))
1529                 *dst++ = *src++;
1530         *dst = '\0';
1531 }
1532
1533 int is_serverip_in_cmd(void)
1534 {
1535         return !!strchr(net_boot_file_name, ':');
1536 }
1537
1538 int net_parse_bootfile(struct in_addr *ipaddr, char *filename, int max_len)
1539 {
1540         char *colon;
1541         struct in_addr ip;
1542         ip.s_addr = 0;
1543
1544         if (net_boot_file_name[0] == '\0')
1545                 return 0;
1546
1547         colon = strchr(net_boot_file_name, ':');
1548         if (colon) {
1549                 ip = string_to_ip(net_boot_file_name);
1550                 if (ipaddr && ip.s_addr)
1551                         *ipaddr = ip;
1552         }
1553         if (ip.s_addr) {
1554                 strncpy(filename, colon + 1, max_len);
1555         } else {
1556                 strncpy(filename, net_boot_file_name, max_len);
1557         }
1558         filename[max_len - 1] = '\0';
1559
1560         return 1;
1561 }
1562
1563 void ip_to_string(struct in_addr x, char *s)
1564 {
1565         x.s_addr = ntohl(x.s_addr);
1566         sprintf(s, "%d.%d.%d.%d",
1567                 (int) ((x.s_addr >> 24) & 0xff),
1568                 (int) ((x.s_addr >> 16) & 0xff),
1569                 (int) ((x.s_addr >> 8) & 0xff),
1570                 (int) ((x.s_addr >> 0) & 0xff)
1571         );
1572 }
1573
1574 void vlan_to_string(ushort x, char *s)
1575 {
1576         x = ntohs(x);
1577
1578         if (x == (ushort)-1)
1579                 x = VLAN_NONE;
1580
1581         if (x == VLAN_NONE)
1582                 strcpy(s, "none");
1583         else
1584                 sprintf(s, "%d", x & VLAN_IDMASK);
1585 }
1586
1587 ushort string_to_vlan(const char *s)
1588 {
1589         ushort id;
1590
1591         if (s == NULL)
1592                 return htons(VLAN_NONE);
1593
1594         if (*s < '0' || *s > '9')
1595                 id = VLAN_NONE;
1596         else
1597                 id = (ushort)dectoul(s, NULL);
1598
1599         return htons(id);
1600 }
1601
1602 ushort env_get_vlan(char *var)
1603 {
1604         return string_to_vlan(env_get(var));
1605 }