net/net.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *      Copied from Linux Monitor (LiMon) - Networking.
   4  *
   5  *      Copyright 1994 - 2000 Neil Russell.
   6  *      (See License)
   7  *      Copyright 2000 Roland Borde
   8  *      Copyright 2000 Paolo Scaffardi
   9  *      Copyright 2000-2002 Wolfgang Denk, wd@denx.de
  10  */
  11
  12 /*
  13  * General Desription:
  14  *
  15  * The user interface supports commands for BOOTP, RARP, and TFTP.
  16  * Also, we support ARP internally. Depending on available data,
  17  * these interact as follows:
  18  *
  19  * BOOTP:
  20  *
  21  *      Prerequisites:  - own ethernet address
  22  *      We want:        - own IP address
  23  *                      - TFTP server IP address
  24  *                      - name of bootfile
  25  *      Next step:      ARP
  26  *
  27  * LINK_LOCAL:
  28  *
  29  *      Prerequisites:  - own ethernet address
  30  *      We want:        - own IP address
  31  *      Next step:      ARP
  32  *
  33  * RARP:
  34  *
  35  *      Prerequisites:  - own ethernet address
  36  *      We want:        - own IP address
  37  *                      - TFTP server IP address
  38  *      Next step:      ARP
  39  *
  40  * ARP:
  41  *
  42  *      Prerequisites:  - own ethernet address
  43  *                      - own IP address
  44  *                      - TFTP server IP address
  45  *      We want:        - TFTP server ethernet address
  46  *      Next step:      TFTP
  47  *
  48  * DHCP:
  49  *
  50  *     Prerequisites:   - own ethernet address
  51  *     We want:         - IP, Netmask, ServerIP, Gateway IP
  52  *                      - bootfilename, lease time
  53  *     Next step:       - TFTP
  54  *
  55  * TFTP:
  56  *
  57  *      Prerequisites:  - own ethernet address
  58  *                      - own IP address
  59  *                      - TFTP server IP address
  60  *                      - TFTP server ethernet address
  61  *                      - name of bootfile (if unknown, we use a default name
  62  *                        derived from our own IP address)
  63  *      We want:        - load the boot file
  64  *      Next step:      none
  65  *
  66  * NFS:
  67  *
  68  *      Prerequisites:  - own ethernet address
  69  *                      - own IP address
  70  *                      - name of bootfile (if unknown, we use a default name
  71  *                        derived from our own IP address)
  72  *      We want:        - load the boot file
  73  *      Next step:      none
  74  *
  75  * SNTP:
  76  *
  77  *      Prerequisites:  - own ethernet address
  78  *                      - own IP address
  79  *      We want:        - network time
  80  *      Next step:      none
  81  *
  82  * WOL:
  83  *
  84  *      Prerequisites:  - own ethernet address
  85  *      We want:        - magic packet or timeout
  86  *      Next step:      none
  87  */
  88
  89
  90 #include <common.h>
  91 #include <bootstage.h>
  92 #include <command.h>
  93 #include <console.h>
  94 #include <env.h>
  95 #include <env_internal.h>
  96 #include <errno.h>
  97 #include <image.h>
  98 #include <log.h>
  99 #include <net.h>
 100 #include <net/fastboot.h>
 101 #include <net/tftp.h>
 102 #if defined(CONFIG_CMD_PCAP)
 103 #include <net/pcap.h>
 104 #endif
 105 #if defined(CONFIG_LED_STATUS)
 106 #include <miiphy.h>
 107 #include <status_led.h>
 108 #endif
 109 #include <watchdog.h>
 110 #include <linux/compiler.h>
 111 #include "arp.h"
 112 #include "bootp.h"
 113 #include "cdp.h"
 114 #if defined(CONFIG_CMD_DNS)
 115 #include "dns.h"
 116 #endif
 117 #include "link_local.h"
 118 #include "nfs.h"
 119 #include "ping.h"
 120 #include "rarp.h"
 121 #if defined(CONFIG_CMD_SNTP)
 122 #include "sntp.h"
 123 #endif
 124 #if defined(CONFIG_CMD_WOL)
 125 #include "wol.h"
 126 #endif
 127
 128 /** BOOTP EXTENTIONS **/
 129
 130 /* Our subnet mask (0=unknown) */
 131 struct in_addr net_netmask;
 132 /* Our gateways IP address */
 133 struct in_addr net_gateway;
 134 /* Our DNS IP address */
 135 struct in_addr net_dns_server;
 136 #if defined(CONFIG_BOOTP_DNS2)
 137 /* Our 2nd DNS IP address */
 138 struct in_addr net_dns_server2;
 139 #endif
 140
 141 /** END OF BOOTP EXTENTIONS **/
 142
 143 /* Our ethernet address */
 144 u8 net_ethaddr[6];
 145 /* Boot server enet address */
 146 u8 net_server_ethaddr[6];
 147 /* Our IP addr (0 = unknown) */
 148 struct in_addr  net_ip;
 149 /* Server IP addr (0 = unknown) */
 150 struct in_addr  net_server_ip;
 151 /* Current receive packet */
 152 uchar *net_rx_packet;
 153 /* Current rx packet length */
 154 int             net_rx_packet_len;
 155 /* IP packet ID */
 156 static unsigned net_ip_id;
 157 /* Ethernet bcast address */
 158 const u8 net_bcast_ethaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 159 const u8 net_null_ethaddr[6];
 160 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
 161 void (*push_packet)(void *, int len) = 0;
 162 #endif
 163 /* Network loop state */
 164 enum net_loop_state net_state;
 165 /* Tried all network devices */
 166 int             net_restart_wrap;
 167 /* Network loop restarted */
 168 static int      net_restarted;
 169 /* At least one device configured */
 170 static int      net_dev_exists;
 171
 172 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
 173 /* default is without VLAN */
 174 ushort          net_our_vlan = 0xFFFF;
 175 /* ditto */
 176 ushort          net_native_vlan = 0xFFFF;
 177
 178 /* Boot File name */
 179 char net_boot_file_name[1024];
 180 /* Indicates whether the file name was specified on the command line */
 181 bool net_boot_file_name_explicit;
 182 /* The actual transferred size of the bootfile (in bytes) */
 183 u32 net_boot_file_size;
 184 /* Boot file size in blocks as reported by the DHCP server */
 185 u32 net_boot_file_expected_size_in_blocks;
 186
 187 #if defined(CONFIG_CMD_SNTP)
 188 /* NTP server IP address */
 189 struct in_addr  net_ntp_server;
 190 /* offset time from UTC */
 191 int             net_ntp_time_offset;
 192 #endif
 193
 194 static uchar net_pkt_buf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 195 /* Receive packets */
 196 uchar *net_rx_packets[PKTBUFSRX];
 197 /* Current UDP RX packet handler */
 198 static rxhand_f *udp_packet_handler;
 199 /* Current ARP RX packet handler */
 200 static rxhand_f *arp_packet_handler;
 201 #ifdef CONFIG_CMD_TFTPPUT
 202 /* Current ICMP rx handler */
 203 static rxhand_icmp_f *packet_icmp_handler;
 204 #endif
 205 /* Current timeout handler */
 206 static thand_f *time_handler;
 207 /* Time base value */
 208 static ulong    time_start;
 209 /* Current timeout value */
 210 static ulong    time_delta;
 211 /* THE transmit packet */
 212 uchar *net_tx_packet;
 213
 214 static int net_check_prereq(enum proto_t protocol);
 215
 216 static int net_try_count;
 217
 218 int __maybe_unused net_busy_flag;
 219
 220 /**********************************************************************/
 221
 222 static int on_ipaddr(const char *name, const char *value, enum env_op op,
 223         int flags)
 224 {
 225         if (flags & H_PROGRAMMATIC)
 226                 return 0;
 227
 228         net_ip = string_to_ip(value);
 229
 230         return 0;
 231 }
 232 U_BOOT_ENV_CALLBACK(ipaddr, on_ipaddr);
 233
 234 static int on_gatewayip(const char *name, const char *value, enum env_op op,
 235         int flags)
 236 {
 237         if (flags & H_PROGRAMMATIC)
 238                 return 0;
 239
 240         net_gateway = string_to_ip(value);
 241
 242         return 0;
 243 }
 244 U_BOOT_ENV_CALLBACK(gatewayip, on_gatewayip);
 245
 246 static int on_netmask(const char *name, const char *value, enum env_op op,
 247         int flags)
 248 {
 249         if (flags & H_PROGRAMMATIC)
 250                 return 0;
 251
 252         net_netmask = string_to_ip(value);
 253
 254         return 0;
 255 }
 256 U_BOOT_ENV_CALLBACK(netmask, on_netmask);
 257
 258 static int on_serverip(const char *name, const char *value, enum env_op op,
 259         int flags)
 260 {
 261         if (flags & H_PROGRAMMATIC)
 262                 return 0;
 263
 264         net_server_ip = string_to_ip(value);
 265
 266         return 0;
 267 }
 268 U_BOOT_ENV_CALLBACK(serverip, on_serverip);
 269
 270 static int on_nvlan(const char *name, const char *value, enum env_op op,
 271         int flags)
 272 {
 273         if (flags & H_PROGRAMMATIC)
 274                 return 0;
 275
 276         net_native_vlan = string_to_vlan(value);
 277
 278         return 0;
 279 }
 280 U_BOOT_ENV_CALLBACK(nvlan, on_nvlan);
 281
 282 static int on_vlan(const char *name, const char *value, enum env_op op,
 283         int flags)
 284 {
 285         if (flags & H_PROGRAMMATIC)
 286                 return 0;
 287
 288         net_our_vlan = string_to_vlan(value);
 289
 290         return 0;
 291 }
 292 U_BOOT_ENV_CALLBACK(vlan, on_vlan);
 293
 294 #if defined(CONFIG_CMD_DNS)
 295 static int on_dnsip(const char *name, const char *value, enum env_op op,
 296         int flags)
 297 {
 298         if (flags & H_PROGRAMMATIC)
 299                 return 0;
 300
 301         net_dns_server = string_to_ip(value);
 302
 303         return 0;
 304 }
 305 U_BOOT_ENV_CALLBACK(dnsip, on_dnsip);
 306 #endif
 307
 308 /*
 309  * Check if autoload is enabled. If so, use either NFS or TFTP to download
 310  * the boot file.
 311  */
 312 void net_auto_load(void)
 313 {
 314 #if defined(CONFIG_CMD_NFS) && !defined(CONFIG_SPL_BUILD)
 315         const char *s = env_get("autoload");
 316
 317         if (s != NULL && strcmp(s, "NFS") == 0) {
 318                 if (net_check_prereq(NFS)) {
 319 /* We aren't expecting to get a serverip, so just accept the assigned IP */
 320 #ifdef CONFIG_BOOTP_SERVERIP
 321                         net_set_state(NETLOOP_SUCCESS);
 322 #else
 323                         printf("Cannot autoload with NFS\n");
 324                         net_set_state(NETLOOP_FAIL);
 325 #endif
 326                         return;
 327                 }
 328                 /*
 329                  * Use NFS to load the bootfile.
 330                  */
 331                 nfs_start();
 332                 return;
 333         }
 334 #endif
 335         if (env_get_yesno("autoload") == 0) {
 336                 /*
 337                  * Just use BOOTP/RARP to configure system;
 338                  * Do not use TFTP to load the bootfile.
 339                  */
 340                 net_set_state(NETLOOP_SUCCESS);
 341                 return;
 342         }
 343         if (net_check_prereq(TFTPGET)) {
 344 /* We aren't expecting to get a serverip, so just accept the assigned IP */
 345 #ifdef CONFIG_BOOTP_SERVERIP
 346                 net_set_state(NETLOOP_SUCCESS);
 347 #else
 348                 printf("Cannot autoload with TFTPGET\n");
 349                 net_set_state(NETLOOP_FAIL);
 350 #endif
 351                 return;
 352         }
 353         tftp_start(TFTPGET);
 354 }
 355
 356 static void net_init_loop(void)
 357 {
 358         if (eth_get_dev())
 359                 memcpy(net_ethaddr, eth_get_ethaddr(), 6);
 360
 361         return;
 362 }
 363
 364 static void net_clear_handlers(void)
 365 {
 366         net_set_udp_handler(NULL);
 367         net_set_arp_handler(NULL);
 368         net_set_timeout_handler(0, NULL);
 369 }
 370
 371 static void net_cleanup_loop(void)
 372 {
 373         net_clear_handlers();
 374 }
 375
 376 void net_init(void)
 377 {
 378         static int first_call = 1;
 379
 380         if (first_call) {
 381                 /*
 382                  *      Setup packet buffers, aligned correctly.
 383                  */
 384                 int i;
 385
 386                 net_tx_packet = &net_pkt_buf[0] + (PKTALIGN - 1);
 387                 net_tx_packet -= (ulong)net_tx_packet % PKTALIGN;
 388                 for (i = 0; i < PKTBUFSRX; i++) {
 389                         net_rx_packets[i] = net_tx_packet +
 390                                 (i + 1) * PKTSIZE_ALIGN;
 391                 }
 392                 arp_init();
 393                 net_clear_handlers();
 394
 395                 /* Only need to setup buffer pointers once. */
 396                 first_call = 0;
 397         }
 398
 399         net_init_loop();
 400 }
 401
 402 /**********************************************************************/
 403 /*
 404  *      Main network processing loop.
 405  */
 406
 407 int net_loop(enum proto_t protocol)
 408 {
 409         int ret = -EINVAL;
 410         enum net_loop_state prev_net_state = net_state;
 411
 412         net_restarted = 0;
 413         net_dev_exists = 0;
 414         net_try_count = 1;
 415         debug_cond(DEBUG_INT_STATE, "--- net_loop Entry\n");
 416
 417         bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
 418         net_init();
 419         if (eth_is_on_demand_init() || protocol != NETCONS) {
 420                 eth_halt();
 421                 eth_set_current();
 422                 ret = eth_init();
 423                 if (ret < 0) {
 424                         eth_halt();
 425                         return ret;
 426                 }
 427         } else {
 428                 eth_init_state_only();
 429         }
 430 restart:
 431 #ifdef CONFIG_USB_KEYBOARD
 432         net_busy_flag = 0;
 433 #endif
 434         net_set_state(NETLOOP_CONTINUE);
 435
 436         /*
 437          *      Start the ball rolling with the given start function.  From
 438          *      here on, this code is a state machine driven by received
 439          *      packets and timer events.
 440          */
 441         debug_cond(DEBUG_INT_STATE, "--- net_loop Init\n");
 442         net_init_loop();
 443
 444         switch (net_check_prereq(protocol)) {
 445         case 1:
 446                 /* network not configured */
 447                 eth_halt();
 448                 net_set_state(prev_net_state);
 449                 return -ENODEV;
 450
 451         case 2:
 452                 /* network device not configured */
 453                 break;
 454
 455         case 0:
 456                 net_dev_exists = 1;
 457                 net_boot_file_size = 0;
 458                 switch (protocol) {
 459 #ifdef CONFIG_CMD_TFTPBOOT
 460                 case TFTPGET:
 461 #ifdef CONFIG_CMD_TFTPPUT
 462                 case TFTPPUT:
 463 #endif
 464                         /* always use ARP to get server ethernet address */
 465                         tftp_start(protocol);
 466                         break;
 467 #endif
 468 #ifdef CONFIG_CMD_TFTPSRV
 469                 case TFTPSRV:
 470                         tftp_start_server();
 471                         break;
 472 #endif
 473 #ifdef CONFIG_UDP_FUNCTION_FASTBOOT
 474                 case FASTBOOT:
 475                         fastboot_start_server();
 476                         break;
 477 #endif
 478 #if defined(CONFIG_CMD_DHCP)
 479                 case DHCP:
 480                         bootp_reset();
 481                         net_ip.s_addr = 0;
 482                         dhcp_request();         /* Basically same as BOOTP */
 483                         break;
 484 #endif
 485 #if defined(CONFIG_CMD_BOOTP)
 486                 case BOOTP:
 487                         bootp_reset();
 488                         net_ip.s_addr = 0;
 489                         bootp_request();
 490                         break;
 491 #endif
 492 #if defined(CONFIG_CMD_RARP)
 493                 case RARP:
 494                         rarp_try = 0;
 495                         net_ip.s_addr = 0;
 496                         rarp_request();
 497                         break;
 498 #endif
 499 #if defined(CONFIG_CMD_PING)
 500                 case PING:
 501                         ping_start();
 502                         break;
 503 #endif
 504 #if defined(CONFIG_CMD_NFS) && !defined(CONFIG_SPL_BUILD)
 505                 case NFS:
 506                         nfs_start();
 507                         break;
 508 #endif
 509 #if defined(CONFIG_CMD_CDP)
 510                 case CDP:
 511                         cdp_start();
 512                         break;
 513 #endif
 514 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
 515                 case NETCONS:
 516                         nc_start();
 517                         break;
 518 #endif
 519 #if defined(CONFIG_CMD_SNTP)
 520                 case SNTP:
 521                         sntp_start();
 522                         break;
 523 #endif
 524 #if defined(CONFIG_CMD_DNS)
 525                 case DNS:
 526                         dns_start();
 527                         break;
 528 #endif
 529 #if defined(CONFIG_CMD_LINK_LOCAL)
 530                 case LINKLOCAL:
 531                         link_local_start();
 532                         break;
 533 #endif
 534 #if defined(CONFIG_CMD_WOL)
 535                 case WOL:
 536                         wol_start();
 537                         break;
 538 #endif
 539                 default:
 540                         break;
 541                 }
 542
 543                 break;
 544         }
 545
 546 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 547 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 548         defined(CONFIG_LED_STATUS)                      && \
 549         defined(CONFIG_LED_STATUS_RED)
 550         /*
 551          * Echo the inverted link state to the fault LED.
 552          */
 553         if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
 554                 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_OFF);
 555         else
 556                 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_ON);
 557 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 558 #endif /* CONFIG_MII, ... */
 559 #ifdef CONFIG_USB_KEYBOARD
 560         net_busy_flag = 1;
 561 #endif
 562
 563         /*
 564          *      Main packet reception loop.  Loop receiving packets until
 565          *      someone sets `net_state' to a state that terminates.
 566          */
 567         for (;;) {
 568                 WATCHDOG_RESET();
 569                 if (arp_timeout_check() > 0)
 570                         time_start = get_timer(0);
 571
 572                 /*
 573                  *      Check the ethernet for a new packet.  The ethernet
 574                  *      receive routine will process it.
 575                  *      Most drivers return the most recent packet size, but not
 576                  *      errors that may have happened.
 577                  */
 578                 eth_rx();
 579
 580                 /*
 581                  *      Abort if ctrl-c was pressed.
 582                  */
 583                 if (ctrlc()) {
 584                         /* cancel any ARP that may not have completed */
 585                         net_arp_wait_packet_ip.s_addr = 0;
 586
 587                         net_cleanup_loop();
 588                         eth_halt();
 589                         /* Invalidate the last protocol */
 590                         eth_set_last_protocol(BOOTP);
 591
 592                         puts("\nAbort\n");
 593                         /* include a debug print as well incase the debug
 594                            messages are directed to stderr */
 595                         debug_cond(DEBUG_INT_STATE, "--- net_loop Abort!\n");
 596                         ret = -EINTR;
 597                         goto done;
 598                 }
 599
 600                 /*
 601                  *      Check for a timeout, and run the timeout handler
 602                  *      if we have one.
 603                  */
 604                 if (time_handler &&
 605                     ((get_timer(0) - time_start) > time_delta)) {
 606                         thand_f *x;
 607
 608 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 609 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 610         defined(CONFIG_LED_STATUS)                      && \
 611         defined(CONFIG_LED_STATUS_RED)
 612                         /*
 613                          * Echo the inverted link state to the fault LED.
 614                          */
 615                         if (miiphy_link(eth_get_dev()->name,
 616                                         CONFIG_SYS_FAULT_MII_ADDR))
 617                                 status_led_set(CONFIG_LED_STATUS_RED,
 618                                                CONFIG_LED_STATUS_OFF);
 619                         else
 620                                 status_led_set(CONFIG_LED_STATUS_RED,
 621                                                CONFIG_LED_STATUS_ON);
 622 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 623 #endif /* CONFIG_MII, ... */
 624                         debug_cond(DEBUG_INT_STATE, "--- net_loop timeout\n");
 625                         x = time_handler;
 626                         time_handler = (thand_f *)0;
 627                         (*x)();
 628                 }
 629
 630                 if (net_state == NETLOOP_FAIL)
 631                         ret = net_start_again();
 632
 633                 switch (net_state) {
 634                 case NETLOOP_RESTART:
 635                         net_restarted = 1;
 636                         goto restart;
 637
 638                 case NETLOOP_SUCCESS:
 639                         net_cleanup_loop();
 640                         if (net_boot_file_size > 0) {
 641                                 printf("Bytes transferred = %d (%x hex)\n",
 642                                        net_boot_file_size, net_boot_file_size);
 643                                 env_set_hex("filesize", net_boot_file_size);
 644                                 env_set_hex("fileaddr", image_load_addr);
 645                         }
 646                         if (protocol != NETCONS)
 647                                 eth_halt();
 648                         else
 649                                 eth_halt_state_only();
 650
 651                         eth_set_last_protocol(protocol);
 652
 653                         ret = net_boot_file_size;
 654                         debug_cond(DEBUG_INT_STATE, "--- net_loop Success!\n");
 655                         goto done;
 656
 657                 case NETLOOP_FAIL:
 658                         net_cleanup_loop();
 659                         /* Invalidate the last protocol */
 660                         eth_set_last_protocol(BOOTP);
 661                         debug_cond(DEBUG_INT_STATE, "--- net_loop Fail!\n");
 662                         ret = -ENONET;
 663                         goto done;
 664
 665                 case NETLOOP_CONTINUE:
 666                         continue;
 667                 }
 668         }
 669
 670 done:
 671 #ifdef CONFIG_USB_KEYBOARD
 672         net_busy_flag = 0;
 673 #endif
 674 #ifdef CONFIG_CMD_TFTPPUT
 675         /* Clear out the handlers */
 676         net_set_udp_handler(NULL);
 677         net_set_icmp_handler(NULL);
 678 #endif
 679         net_set_state(prev_net_state);
 680
 681 #if defined(CONFIG_CMD_PCAP)
 682         if (pcap_active())
 683                 pcap_print_status();
 684 #endif
 685         return ret;
 686 }
 687
 688 /**********************************************************************/
 689
 690 static void start_again_timeout_handler(void)
 691 {
 692         net_set_state(NETLOOP_RESTART);
 693 }
 694
 695 int net_start_again(void)
 696 {
 697         char *nretry;
 698         int retry_forever = 0;
 699         unsigned long retrycnt = 0;
 700         int ret;
 701
 702         nretry = env_get("netretry");
 703         if (nretry) {
 704                 if (!strcmp(nretry, "yes"))
 705                         retry_forever = 1;
 706                 else if (!strcmp(nretry, "no"))
 707                         retrycnt = 0;
 708                 else if (!strcmp(nretry, "once"))
 709                         retrycnt = 1;
 710                 else
 711                         retrycnt = simple_strtoul(nretry, NULL, 0);
 712         } else {
 713                 retrycnt = 0;
 714                 retry_forever = 0;
 715         }
 716
 717         if ((!retry_forever) && (net_try_count > retrycnt)) {
 718                 eth_halt();
 719                 net_set_state(NETLOOP_FAIL);
 720                 /*
 721                  * We don't provide a way for the protocol to return an error,
 722                  * but this is almost always the reason.
 723                  */
 724                 return -ETIMEDOUT;
 725         }
 726
 727         net_try_count++;
 728
 729         eth_halt();
 730 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
 731         eth_try_another(!net_restarted);
 732 #endif
 733         ret = eth_init();
 734         if (net_restart_wrap) {
 735                 net_restart_wrap = 0;
 736                 if (net_dev_exists) {
 737                         net_set_timeout_handler(10000UL,
 738                                                 start_again_timeout_handler);
 739                         net_set_udp_handler(NULL);
 740                 } else {
 741                         net_set_state(NETLOOP_FAIL);
 742                 }
 743         } else {
 744                 net_set_state(NETLOOP_RESTART);
 745         }
 746         return ret;
 747 }
 748
 749 /**********************************************************************/
 750 /*
 751  *      Miscelaneous bits.
 752  */
 753
 754 static void dummy_handler(uchar *pkt, unsigned dport,
 755                         struct in_addr sip, unsigned sport,
 756                         unsigned len)
 757 {
 758 }
 759
 760 rxhand_f *net_get_udp_handler(void)
 761 {
 762         return udp_packet_handler;
 763 }
 764
 765 void net_set_udp_handler(rxhand_f *f)
 766 {
 767         debug_cond(DEBUG_INT_STATE, "--- net_loop UDP handler set (%p)\n", f);
 768         if (f == NULL)
 769                 udp_packet_handler = dummy_handler;
 770         else
 771                 udp_packet_handler = f;
 772 }
 773
 774 rxhand_f *net_get_arp_handler(void)
 775 {
 776         return arp_packet_handler;
 777 }
 778
 779 void net_set_arp_handler(rxhand_f *f)
 780 {
 781         debug_cond(DEBUG_INT_STATE, "--- net_loop ARP handler set (%p)\n", f);
 782         if (f == NULL)
 783                 arp_packet_handler = dummy_handler;
 784         else
 785                 arp_packet_handler = f;
 786 }
 787
 788 #ifdef CONFIG_CMD_TFTPPUT
 789 void net_set_icmp_handler(rxhand_icmp_f *f)
 790 {
 791         packet_icmp_handler = f;
 792 }
 793 #endif
 794
 795 void net_set_timeout_handler(ulong iv, thand_f *f)
 796 {
 797         if (iv == 0) {
 798                 debug_cond(DEBUG_INT_STATE,
 799                            "--- net_loop timeout handler cancelled\n");
 800                 time_handler = (thand_f *)0;
 801         } else {
 802                 debug_cond(DEBUG_INT_STATE,
 803                            "--- net_loop timeout handler set (%p)\n", f);
 804                 time_handler = f;
 805                 time_start = get_timer(0);
 806                 time_delta = iv * CONFIG_SYS_HZ / 1000;
 807         }
 808 }
 809
 810 uchar *net_get_async_tx_pkt_buf(void)
 811 {
 812         if (arp_is_waiting())
 813                 return arp_tx_packet; /* If we are waiting, we already sent */
 814         else
 815                 return net_tx_packet;
 816 }
 817
 818 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
 819                 int payload_len)
 820 {
 821         return net_send_ip_packet(ether, dest, dport, sport, payload_len,
 822                                   IPPROTO_UDP, 0, 0, 0);
 823 }
 824
 825 int net_send_ip_packet(uchar *ether, struct in_addr dest, int dport, int sport,
 826                        int payload_len, int proto, u8 action, u32 tcp_seq_num,
 827                        u32 tcp_ack_num)
 828 {
 829         uchar *pkt;
 830         int eth_hdr_size;
 831         int pkt_hdr_size;
 832
 833         /* make sure the net_tx_packet is initialized (net_init() was called) */
 834         assert(net_tx_packet != NULL);
 835         if (net_tx_packet == NULL)
 836                 return -1;
 837
 838         /* convert to new style broadcast */
 839         if (dest.s_addr == 0)
 840                 dest.s_addr = 0xFFFFFFFF;
 841
 842         /* if broadcast, make the ether address a broadcast and don't do ARP */
 843         if (dest.s_addr == 0xFFFFFFFF)
 844                 ether = (uchar *)net_bcast_ethaddr;
 845
 846         pkt = (uchar *)net_tx_packet;
 847
 848         eth_hdr_size = net_set_ether(pkt, ether, PROT_IP);
 849
 850         switch (proto) {
 851         case IPPROTO_UDP:
 852                 net_set_udp_header(pkt + eth_hdr_size, dest, dport, sport,
 853                                    payload_len);
 854                 pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
 855                 break;
 856         default:
 857                 return -EINVAL;
 858         }
 859
 860         /* if MAC address was not discovered yet, do an ARP request */
 861         if (memcmp(ether, net_null_ethaddr, 6) == 0) {
 862                 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest);
 863
 864                 /* save the ip and eth addr for the packet to send after arp */
 865                 net_arp_wait_packet_ip = dest;
 866                 arp_wait_packet_ethaddr = ether;
 867
 868                 /* size of the waiting packet */
 869                 arp_wait_tx_packet_size = pkt_hdr_size + payload_len;
 870
 871                 /* and do the ARP request */
 872                 arp_wait_try = 1;
 873                 arp_wait_timer_start = get_timer(0);
 874                 arp_request();
 875                 return 1;       /* waiting */
 876         } else {
 877                 debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
 878                            &dest, ether);
 879                 net_send_packet(net_tx_packet, pkt_hdr_size + payload_len);
 880                 return 0;       /* transmitted */
 881         }
 882 }
 883
 884 #ifdef CONFIG_IP_DEFRAG
 885 /*
 886  * This function collects fragments in a single packet, according
 887  * to the algorithm in RFC815. It returns NULL or the pointer to
 888  * a complete packet, in static storage
 889  */
 890 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG)
 891
 892 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE)
 893
 894 /*
 895  * this is the packet being assembled, either data or frag control.
 896  * Fragments go by 8 bytes, so this union must be 8 bytes long
 897  */
 898 struct hole {
 899         /* first_byte is address of this structure */
 900         u16 last_byte;  /* last byte in this hole + 1 (begin of next hole) */
 901         u16 next_hole;  /* index of next (in 8-b blocks), 0 == none */
 902         u16 prev_hole;  /* index of prev, 0 == none */
 903         u16 unused;
 904 };
 905
 906 static struct ip_udp_hdr *__net_defragment(struct ip_udp_hdr *ip, int *lenp)
 907 {
 908         static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
 909         static u16 first_hole, total_len;
 910         struct hole *payload, *thisfrag, *h, *newh;
 911         struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff;
 912         uchar *indata = (uchar *)ip;
 913         int offset8, start, len, done = 0;
 914         u16 ip_off = ntohs(ip->ip_off);
 915
 916         /* payload starts after IP header, this fragment is in there */
 917         payload = (struct hole *)(pkt_buff + IP_HDR_SIZE);
 918         offset8 =  (ip_off & IP_OFFS);
 919         thisfrag = payload + offset8;
 920         start = offset8 * 8;
 921         len = ntohs(ip->ip_len) - IP_HDR_SIZE;
 922
 923         if (start + len > IP_MAXUDP) /* fragment extends too far */
 924                 return NULL;
 925
 926         if (!total_len || localip->ip_id != ip->ip_id) {
 927                 /* new (or different) packet, reset structs */
 928                 total_len = 0xffff;
 929                 payload[0].last_byte = ~0;
 930                 payload[0].next_hole = 0;
 931                 payload[0].prev_hole = 0;
 932                 first_hole = 0;
 933                 /* any IP header will work, copy the first we received */
 934                 memcpy(localip, ip, IP_HDR_SIZE);
 935         }
 936
 937         /*
 938          * What follows is the reassembly algorithm. We use the payload
 939          * array as a linked list of hole descriptors, as each hole starts
 940          * at a multiple of 8 bytes. However, last byte can be whatever value,
 941          * so it is represented as byte count, not as 8-byte blocks.
 942          */
 943
 944         h = payload + first_hole;
 945         while (h->last_byte < start) {
 946                 if (!h->next_hole) {
 947                         /* no hole that far away */
 948                         return NULL;
 949                 }
 950                 h = payload + h->next_hole;
 951         }
 952
 953         /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
 954         if (offset8 + ((len + 7) / 8) <= h - payload) {
 955                 /* no overlap with holes (dup fragment?) */
 956                 return NULL;
 957         }
 958
 959         if (!(ip_off & IP_FLAGS_MFRAG)) {
 960                 /* no more fragmentss: truncate this (last) hole */
 961                 total_len = start + len;
 962                 h->last_byte = start + len;
 963         }
 964
 965         /*
 966          * There is some overlap: fix the hole list. This code doesn't
 967          * deal with a fragment that overlaps with two different holes
 968          * (thus being a superset of a previously-received fragment).
 969          */
 970
 971         if ((h >= thisfrag) && (h->last_byte <= start + len)) {
 972                 /* complete overlap with hole: remove hole */
 973                 if (!h->prev_hole && !h->next_hole) {
 974                         /* last remaining hole */
 975                         done = 1;
 976                 } else if (!h->prev_hole) {
 977                         /* first hole */
 978                         first_hole = h->next_hole;
 979                         payload[h->next_hole].prev_hole = 0;
 980                 } else if (!h->next_hole) {
 981                         /* last hole */
 982                         payload[h->prev_hole].next_hole = 0;
 983                 } else {
 984                         /* in the middle of the list */
 985                         payload[h->next_hole].prev_hole = h->prev_hole;
 986                         payload[h->prev_hole].next_hole = h->next_hole;
 987                 }
 988
 989         } else if (h->last_byte <= start + len) {
 990                 /* overlaps with final part of the hole: shorten this hole */
 991                 h->last_byte = start;
 992
 993         } else if (h >= thisfrag) {
 994                 /* overlaps with initial part of the hole: move this hole */
 995                 newh = thisfrag + (len / 8);
 996                 *newh = *h;
 997                 h = newh;
 998                 if (h->next_hole)
 999                         payload[h->next_hole].prev_hole = (h - payload);
1000                 if (h->prev_hole)
1001                         payload[h->prev_hole].next_hole = (h - payload);
1002                 else
1003                         first_hole = (h - payload);
1004
1005         } else {
1006                 /* fragment sits in the middle: split the hole */
1007                 newh = thisfrag + (len / 8);
1008                 *newh = *h;
1009                 h->last_byte = start;
1010                 h->next_hole = (newh - payload);
1011                 newh->prev_hole = (h - payload);
1012                 if (newh->next_hole)
1013                         payload[newh->next_hole].prev_hole = (newh - payload);
1014         }
1015
1016         /* finally copy this fragment and possibly return whole packet */
1017         memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len);
1018         if (!done)
1019                 return NULL;
1020
1021         localip->ip_len = htons(total_len);
1022         *lenp = total_len + IP_HDR_SIZE;
1023         return localip;
1024 }
1025
1026 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
1027         int *lenp)
1028 {
1029         u16 ip_off = ntohs(ip->ip_off);
1030         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1031                 return ip; /* not a fragment */
1032         return __net_defragment(ip, lenp);
1033 }
1034
1035 #else /* !CONFIG_IP_DEFRAG */
1036
1037 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
1038         int *lenp)
1039 {
1040         u16 ip_off = ntohs(ip->ip_off);
1041         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1042                 return ip; /* not a fragment */
1043         return NULL;
1044 }
1045 #endif
1046
1047 /**
1048  * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
1049  * drop others.
1050  *
1051  * @parma ip    IP packet containing the ICMP
1052  */
1053 static void receive_icmp(struct ip_udp_hdr *ip, int len,
1054                         struct in_addr src_ip, struct ethernet_hdr *et)
1055 {
1056         struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
1057
1058         switch (icmph->type) {
1059         case ICMP_REDIRECT:
1060                 if (icmph->code != ICMP_REDIR_HOST)
1061                         return;
1062                 printf(" ICMP Host Redirect to %pI4 ",
1063                        &icmph->un.gateway);
1064                 break;
1065         default:
1066 #if defined(CONFIG_CMD_PING)
1067                 ping_receive(et, ip, len);
1068 #endif
1069 #ifdef CONFIG_CMD_TFTPPUT
1070                 if (packet_icmp_handler)
1071                         packet_icmp_handler(icmph->type, icmph->code,
1072                                             ntohs(ip->udp_dst), src_ip,
1073                                             ntohs(ip->udp_src), icmph->un.data,
1074                                             ntohs(ip->udp_len));
1075 #endif
1076                 break;
1077         }
1078 }
1079
1080 void net_process_received_packet(uchar *in_packet, int len)
1081 {
1082         struct ethernet_hdr *et;
1083         struct ip_udp_hdr *ip;
1084         struct in_addr dst_ip;
1085         struct in_addr src_ip;
1086         int eth_proto;
1087 #if defined(CONFIG_CMD_CDP)
1088         int iscdp;
1089 #endif
1090         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1091
1092         debug_cond(DEBUG_NET_PKT, "packet received\n");
1093
1094 #if defined(CONFIG_CMD_PCAP)
1095         pcap_post(in_packet, len, false);
1096 #endif
1097         net_rx_packet = in_packet;
1098         net_rx_packet_len = len;
1099         et = (struct ethernet_hdr *)in_packet;
1100
1101         /* too small packet? */
1102         if (len < ETHER_HDR_SIZE)
1103                 return;
1104
1105 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
1106         if (push_packet) {
1107                 (*push_packet)(in_packet, len);
1108                 return;
1109         }
1110 #endif
1111
1112 #if defined(CONFIG_CMD_CDP)
1113         /* keep track if packet is CDP */
1114         iscdp = is_cdp_packet(et->et_dest);
1115 #endif
1116
1117         myvlanid = ntohs(net_our_vlan);
1118         if (myvlanid == (ushort)-1)
1119                 myvlanid = VLAN_NONE;
1120         mynvlanid = ntohs(net_native_vlan);
1121         if (mynvlanid == (ushort)-1)
1122                 mynvlanid = VLAN_NONE;
1123
1124         eth_proto = ntohs(et->et_protlen);
1125
1126         if (eth_proto < 1514) {
1127                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1128                 /*
1129                  *      Got a 802.2 packet.  Check the other protocol field.
1130                  *      XXX VLAN over 802.2+SNAP not implemented!
1131                  */
1132                 eth_proto = ntohs(et802->et_prot);
1133
1134                 ip = (struct ip_udp_hdr *)(in_packet + E802_HDR_SIZE);
1135                 len -= E802_HDR_SIZE;
1136
1137         } else if (eth_proto != PROT_VLAN) {    /* normal packet */
1138                 ip = (struct ip_udp_hdr *)(in_packet + ETHER_HDR_SIZE);
1139                 len -= ETHER_HDR_SIZE;
1140
1141         } else {                        /* VLAN packet */
1142                 struct vlan_ethernet_hdr *vet =
1143                         (struct vlan_ethernet_hdr *)et;
1144
1145                 debug_cond(DEBUG_NET_PKT, "VLAN packet received\n");
1146
1147                 /* too small packet? */
1148                 if (len < VLAN_ETHER_HDR_SIZE)
1149                         return;
1150
1151                 /* if no VLAN active */
1152                 if ((ntohs(net_our_vlan) & VLAN_IDMASK) == VLAN_NONE
1153 #if defined(CONFIG_CMD_CDP)
1154                                 && iscdp == 0
1155 #endif
1156                                 )
1157                         return;
1158
1159                 cti = ntohs(vet->vet_tag);
1160                 vlanid = cti & VLAN_IDMASK;
1161                 eth_proto = ntohs(vet->vet_type);
1162
1163                 ip = (struct ip_udp_hdr *)(in_packet + VLAN_ETHER_HDR_SIZE);
1164                 len -= VLAN_ETHER_HDR_SIZE;
1165         }
1166
1167         debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto);
1168
1169 #if defined(CONFIG_CMD_CDP)
1170         if (iscdp) {
1171                 cdp_receive((uchar *)ip, len);
1172                 return;
1173         }
1174 #endif
1175
1176         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1177                 if (vlanid == VLAN_NONE)
1178                         vlanid = (mynvlanid & VLAN_IDMASK);
1179                 /* not matched? */
1180                 if (vlanid != (myvlanid & VLAN_IDMASK))
1181                         return;
1182         }
1183
1184         switch (eth_proto) {
1185         case PROT_ARP:
1186                 arp_receive(et, ip, len);
1187                 break;
1188
1189 #ifdef CONFIG_CMD_RARP
1190         case PROT_RARP:
1191                 rarp_receive(ip, len);
1192                 break;
1193 #endif
1194         case PROT_IP:
1195                 debug_cond(DEBUG_NET_PKT, "Got IP\n");
1196                 /* Before we start poking the header, make sure it is there */
1197                 if (len < IP_UDP_HDR_SIZE) {
1198                         debug("len bad %d < %lu\n", len,
1199                               (ulong)IP_UDP_HDR_SIZE);
1200                         return;
1201                 }
1202                 /* Check the packet length */
1203                 if (len < ntohs(ip->ip_len)) {
1204                         debug("len bad %d < %d\n", len, ntohs(ip->ip_len));
1205                         return;
1206                 }
1207                 len = ntohs(ip->ip_len);
1208                 debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n",
1209                            len, ip->ip_hl_v & 0xff);
1210
1211                 /* Can't deal with anything except IPv4 */
1212                 if ((ip->ip_hl_v & 0xf0) != 0x40)
1213                         return;
1214                 /* Can't deal with IP options (headers != 20 bytes) */
1215                 if ((ip->ip_hl_v & 0x0f) > 0x05)
1216                         return;
1217                 /* Check the Checksum of the header */
1218                 if (!ip_checksum_ok((uchar *)ip, IP_HDR_SIZE)) {
1219                         debug("checksum bad\n");
1220                         return;
1221                 }
1222                 /* If it is not for us, ignore it */
1223                 dst_ip = net_read_ip(&ip->ip_dst);
1224                 if (net_ip.s_addr && dst_ip.s_addr != net_ip.s_addr &&
1225                     dst_ip.s_addr != 0xFFFFFFFF) {
1226                                 return;
1227                 }
1228                 /* Read source IP address for later use */
1229                 src_ip = net_read_ip(&ip->ip_src);
1230                 /*
1231                  * The function returns the unchanged packet if it's not
1232                  * a fragment, and either the complete packet or NULL if
1233                  * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1234                  */
1235                 ip = net_defragment(ip, &len);
1236                 if (!ip)
1237                         return;
1238                 /*
1239                  * watch for ICMP host redirects
1240                  *
1241                  * There is no real handler code (yet). We just watch
1242                  * for ICMP host redirect messages. In case anybody
1243                  * sees these messages: please contact me
1244                  * (wd@denx.de), or - even better - send me the
1245                  * necessary fixes :-)
1246                  *
1247                  * Note: in all cases where I have seen this so far
1248                  * it was a problem with the router configuration,
1249                  * for instance when a router was configured in the
1250                  * BOOTP reply, but the TFTP server was on the same
1251                  * subnet. So this is probably a warning that your
1252                  * configuration might be wrong. But I'm not really
1253                  * sure if there aren't any other situations.
1254                  *
1255                  * Simon Glass <sjg@chromium.org>: We get an ICMP when
1256                  * we send a tftp packet to a dead connection, or when
1257                  * there is no server at the other end.
1258                  */
1259                 if (ip->ip_p == IPPROTO_ICMP) {
1260                         receive_icmp(ip, len, src_ip, et);
1261                         return;
1262                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1263                         return;
1264                 }
1265
1266                 if (ntohs(ip->udp_len) < UDP_HDR_SIZE || ntohs(ip->udp_len) > ntohs(ip->ip_len))
1267                         return;
1268
1269                 debug_cond(DEBUG_DEV_PKT,
1270                            "received UDP (to=%pI4, from=%pI4, len=%d)\n",
1271                            &dst_ip, &src_ip, len);
1272
1273 #ifdef CONFIG_UDP_CHECKSUM
1274                 if (ip->udp_xsum != 0) {
1275                         ulong   xsum;
1276                         u8 *sumptr;
1277                         ushort  sumlen;
1278
1279                         xsum  = ip->ip_p;
1280                         xsum += (ntohs(ip->udp_len));
1281                         xsum += (ntohl(ip->ip_src.s_addr) >> 16) & 0x0000ffff;
1282                         xsum += (ntohl(ip->ip_src.s_addr) >>  0) & 0x0000ffff;
1283                         xsum += (ntohl(ip->ip_dst.s_addr) >> 16) & 0x0000ffff;
1284                         xsum += (ntohl(ip->ip_dst.s_addr) >>  0) & 0x0000ffff;
1285
1286                         sumlen = ntohs(ip->udp_len);
1287                         sumptr = (u8 *)&ip->udp_src;
1288
1289                         while (sumlen > 1) {
1290                                 /* inlined ntohs() to avoid alignment errors */
1291                                 xsum += (sumptr[0] << 8) + sumptr[1];
1292                                 sumptr += 2;
1293                                 sumlen -= 2;
1294                         }
1295                         if (sumlen > 0)
1296                                 xsum += (sumptr[0] << 8) + sumptr[0];
1297                         while ((xsum >> 16) != 0) {
1298                                 xsum = (xsum & 0x0000ffff) +
1299                                        ((xsum >> 16) & 0x0000ffff);
1300                         }
1301                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1302                                 printf(" UDP wrong checksum %08lx %08x\n",
1303                                        xsum, ntohs(ip->udp_xsum));
1304                                 return;
1305                         }
1306                 }
1307 #endif
1308
1309 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
1310                 nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
1311                                 src_ip,
1312                                 ntohs(ip->udp_dst),
1313                                 ntohs(ip->udp_src),
1314                                 ntohs(ip->udp_len) - UDP_HDR_SIZE);
1315 #endif
1316                 /*
1317                  * IP header OK.  Pass the packet to the current handler.
1318                  */
1319                 (*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE,
1320                                       ntohs(ip->udp_dst),
1321                                       src_ip,
1322                                       ntohs(ip->udp_src),
1323                                       ntohs(ip->udp_len) - UDP_HDR_SIZE);
1324                 break;
1325 #ifdef CONFIG_CMD_WOL
1326         case PROT_WOL:
1327                 wol_receive(ip, len);
1328                 break;
1329 #endif
1330         }
1331 }
1332
1333 /**********************************************************************/
1334
1335 static int net_check_prereq(enum proto_t protocol)
1336 {
1337         switch (protocol) {
1338                 /* Fall through */
1339 #if defined(CONFIG_CMD_PING)
1340         case PING:
1341                 if (net_ping_ip.s_addr == 0) {
1342                         puts("*** ERROR: ping address not given\n");
1343                         return 1;
1344                 }
1345                 goto common;
1346 #endif
1347 #if defined(CONFIG_CMD_SNTP)
1348         case SNTP:
1349                 if (net_ntp_server.s_addr == 0) {
1350                         puts("*** ERROR: NTP server address not given\n");
1351                         return 1;
1352                 }
1353                 goto common;
1354 #endif
1355 #if defined(CONFIG_CMD_DNS)
1356         case DNS:
1357                 if (net_dns_server.s_addr == 0) {
1358                         puts("*** ERROR: DNS server address not given\n");
1359                         return 1;
1360                 }
1361                 goto common;
1362 #endif
1363 #if defined(CONFIG_CMD_NFS)
1364         case NFS:
1365 #endif
1366                 /* Fall through */
1367         case TFTPGET:
1368         case TFTPPUT:
1369                 if (net_server_ip.s_addr == 0 && !is_serverip_in_cmd()) {
1370                         puts("*** ERROR: `serverip' not set\n");
1371                         return 1;
1372                 }
1373 #if     defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
1374         defined(CONFIG_CMD_DNS)
1375 common:
1376 #endif
1377                 /* Fall through */
1378
1379         case NETCONS:
1380         case FASTBOOT:
1381         case TFTPSRV:
1382                 if (net_ip.s_addr == 0) {
1383                         puts("*** ERROR: `ipaddr' not set\n");
1384                         return 1;
1385                 }
1386                 /* Fall through */
1387
1388 #ifdef CONFIG_CMD_RARP
1389         case RARP:
1390 #endif
1391         case BOOTP:
1392         case CDP:
1393         case DHCP:
1394         case LINKLOCAL:
1395                 if (memcmp(net_ethaddr, "\0\0\0\0\0\0", 6) == 0) {
1396                         int num = eth_get_dev_index();
1397
1398                         switch (num) {
1399                         case -1:
1400                                 puts("*** ERROR: No ethernet found.\n");
1401                                 return 1;
1402                         case 0:
1403                                 puts("*** ERROR: `ethaddr' not set\n");
1404                                 break;
1405                         default:
1406                                 printf("*** ERROR: `eth%daddr' not set\n",
1407                                        num);
1408                                 break;
1409                         }
1410
1411                         net_start_again();
1412                         return 2;
1413                 }
1414                 /* Fall through */
1415         default:
1416                 return 0;
1417         }
1418         return 0;               /* OK */
1419 }
1420 /**********************************************************************/
1421
1422 int
1423 net_eth_hdr_size(void)
1424 {
1425         ushort myvlanid;
1426
1427         myvlanid = ntohs(net_our_vlan);
1428         if (myvlanid == (ushort)-1)
1429                 myvlanid = VLAN_NONE;
1430
1431         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1432                 VLAN_ETHER_HDR_SIZE;
1433 }
1434
1435 int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot)
1436 {
1437         struct ethernet_hdr *et = (struct ethernet_hdr *)xet;
1438         ushort myvlanid;
1439
1440         myvlanid = ntohs(net_our_vlan);
1441         if (myvlanid == (ushort)-1)
1442                 myvlanid = VLAN_NONE;
1443
1444         memcpy(et->et_dest, dest_ethaddr, 6);
1445         memcpy(et->et_src, net_ethaddr, 6);
1446         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1447                 et->et_protlen = htons(prot);
1448                 return ETHER_HDR_SIZE;
1449         } else {
1450                 struct vlan_ethernet_hdr *vet =
1451                         (struct vlan_ethernet_hdr *)xet;
1452
1453                 vet->vet_vlan_type = htons(PROT_VLAN);
1454                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1455                 vet->vet_type = htons(prot);
1456                 return VLAN_ETHER_HDR_SIZE;
1457         }
1458 }
1459
1460 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
1461 {
1462         ushort protlen;
1463
1464         memcpy(et->et_dest, addr, 6);
1465         memcpy(et->et_src, net_ethaddr, 6);
1466         protlen = ntohs(et->et_protlen);
1467         if (protlen == PROT_VLAN) {
1468                 struct vlan_ethernet_hdr *vet =
1469                         (struct vlan_ethernet_hdr *)et;
1470                 vet->vet_type = htons(prot);
1471                 return VLAN_ETHER_HDR_SIZE;
1472         } else if (protlen > 1514) {
1473                 et->et_protlen = htons(prot);
1474                 return ETHER_HDR_SIZE;
1475         } else {
1476                 /* 802.2 + SNAP */
1477                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1478                 et802->et_prot = htons(prot);
1479                 return E802_HDR_SIZE;
1480         }
1481 }
1482
1483 void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source,
1484                        u16 pkt_len, u8 proto)
1485 {
1486         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1487
1488         /*
1489          *      Construct an IP header.
1490          */
1491         /* IP_HDR_SIZE / 4 (not including UDP) */
1492         ip->ip_hl_v  = 0x45;
1493         ip->ip_tos   = 0;
1494         ip->ip_len   = htons(pkt_len);
1495         ip->ip_p     = proto;
1496         ip->ip_id    = htons(net_ip_id++);
1497         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1498         ip->ip_ttl   = 255;
1499         ip->ip_sum   = 0;
1500         /* already in network byte order */
1501         net_copy_ip((void *)&ip->ip_src, &source);
1502         /* already in network byte order */
1503         net_copy_ip((void *)&ip->ip_dst, &dest);
1504
1505         ip->ip_sum   = compute_ip_checksum(ip, IP_HDR_SIZE);
1506 }
1507
1508 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport,
1509                         int len)
1510 {
1511         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1512
1513         /*
1514          *      If the data is an odd number of bytes, zero the
1515          *      byte after the last byte so that the checksum
1516          *      will work.
1517          */
1518         if (len & 1)
1519                 pkt[IP_UDP_HDR_SIZE + len] = 0;
1520
1521         net_set_ip_header(pkt, dest, net_ip, IP_UDP_HDR_SIZE + len,
1522                           IPPROTO_UDP);
1523
1524         ip->udp_src  = htons(sport);
1525         ip->udp_dst  = htons(dport);
1526         ip->udp_len  = htons(UDP_HDR_SIZE + len);
1527         ip->udp_xsum = 0;
1528 }
1529
1530 void copy_filename(char *dst, const char *src, int size)
1531 {
1532         if (src && *src && (*src == '"')) {
1533                 ++src;
1534                 --size;
1535         }
1536
1537         while ((--size > 0) && src && *src && (*src != '"'))
1538                 *dst++ = *src++;
1539         *dst = '\0';
1540 }
1541
1542 int is_serverip_in_cmd(void)
1543 {
1544         return !!strchr(net_boot_file_name, ':');
1545 }
1546
1547 int net_parse_bootfile(struct in_addr *ipaddr, char *filename, int max_len)
1548 {
1549         char *colon;
1550
1551         if (net_boot_file_name[0] == '\0')
1552                 return 0;
1553
1554         colon = strchr(net_boot_file_name, ':');
1555         if (colon) {
1556                 if (ipaddr)
1557                         *ipaddr = string_to_ip(net_boot_file_name);
1558                 strncpy(filename, colon + 1, max_len);
1559         } else {
1560                 strncpy(filename, net_boot_file_name, max_len);
1561         }
1562         filename[max_len - 1] = '\0';
1563
1564         return 1;
1565 }
1566
1567 void ip_to_string(struct in_addr x, char *s)
1568 {
1569         x.s_addr = ntohl(x.s_addr);
1570         sprintf(s, "%d.%d.%d.%d",
1571                 (int) ((x.s_addr >> 24) & 0xff),
1572                 (int) ((x.s_addr >> 16) & 0xff),
1573                 (int) ((x.s_addr >> 8) & 0xff),
1574                 (int) ((x.s_addr >> 0) & 0xff)
1575         );
1576 }
1577
1578 void vlan_to_string(ushort x, char *s)
1579 {
1580         x = ntohs(x);
1581
1582         if (x == (ushort)-1)
1583                 x = VLAN_NONE;
1584
1585         if (x == VLAN_NONE)
1586                 strcpy(s, "none");
1587         else
1588                 sprintf(s, "%d", x & VLAN_IDMASK);
1589 }
1590
1591 ushort string_to_vlan(const char *s)
1592 {
1593         ushort id;
1594
1595         if (s == NULL)
1596                 return htons(VLAN_NONE);
1597
1598         if (*s < '0' || *s > '9')
1599                 id = VLAN_NONE;
1600         else
1601                 id = (ushort)simple_strtoul(s, NULL, 10);
1602
1603         return htons(id);
1604 }
1605
1606 ushort env_get_vlan(char *var)
1607 {
1608         return string_to_vlan(env_get(var));
1609 }