net/net.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *      Copied from Linux Monitor (LiMon) - Networking.
   4  *
   5  *      Copyright 1994 - 2000 Neil Russell.
   6  *      (See License)
   7  *      Copyright 2000 Roland Borde
   8  *      Copyright 2000 Paolo Scaffardi
   9  *      Copyright 2000-2002 Wolfgang Denk, wd@denx.de
  10  */
  11
  12 /*
  13  * General Desription:
  14  *
  15  * The user interface supports commands for BOOTP, RARP, and TFTP.
  16  * Also, we support ARP internally. Depending on available data,
  17  * these interact as follows:
  18  *
  19  * BOOTP:
  20  *
  21  *      Prerequisites:  - own ethernet address
  22  *      We want:        - own IP address
  23  *                      - TFTP server IP address
  24  *                      - name of bootfile
  25  *      Next step:      ARP
  26  *
  27  * LINK_LOCAL:
  28  *
  29  *      Prerequisites:  - own ethernet address
  30  *      We want:        - own IP address
  31  *      Next step:      ARP
  32  *
  33  * RARP:
  34  *
  35  *      Prerequisites:  - own ethernet address
  36  *      We want:        - own IP address
  37  *                      - TFTP server IP address
  38  *      Next step:      ARP
  39  *
  40  * ARP:
  41  *
  42  *      Prerequisites:  - own ethernet address
  43  *                      - own IP address
  44  *                      - TFTP server IP address
  45  *      We want:        - TFTP server ethernet address
  46  *      Next step:      TFTP
  47  *
  48  * DHCP:
  49  *
  50  *     Prerequisites:   - own ethernet address
  51  *     We want:         - IP, Netmask, ServerIP, Gateway IP
  52  *                      - bootfilename, lease time
  53  *     Next step:       - TFTP
  54  *
  55  * TFTP:
  56  *
  57  *      Prerequisites:  - own ethernet address
  58  *                      - own IP address
  59  *                      - TFTP server IP address
  60  *                      - TFTP server ethernet address
  61  *                      - name of bootfile (if unknown, we use a default name
  62  *                        derived from our own IP address)
  63  *      We want:        - load the boot file
  64  *      Next step:      none
  65  *
  66  * NFS:
  67  *
  68  *      Prerequisites:  - own ethernet address
  69  *                      - own IP address
  70  *                      - name of bootfile (if unknown, we use a default name
  71  *                        derived from our own IP address)
  72  *      We want:        - load the boot file
  73  *      Next step:      none
  74  *
  75  * SNTP:
  76  *
  77  *      Prerequisites:  - own ethernet address
  78  *                      - own IP address
  79  *      We want:        - network time
  80  *      Next step:      none
  81  *
  82  * WOL:
  83  *
  84  *      Prerequisites:  - own ethernet address
  85  *      We want:        - magic packet or timeout
  86  *      Next step:      none
  87  */
  88
  89
  90 #include <common.h>
  91 #include <command.h>
  92 #include <console.h>
  93 #include <env.h>
  94 #include <environment.h>
  95 #include <errno.h>
  96 #include <net.h>
  97 #include <net/fastboot.h>
  98 #include <net/tftp.h>
  99 #if defined(CONFIG_LED_STATUS)
 100 #include <miiphy.h>
 101 #include <status_led.h>
 102 #endif
 103 #include <watchdog.h>
 104 #include <linux/compiler.h>
 105 #include "arp.h"
 106 #include "bootp.h"
 107 #include "cdp.h"
 108 #if defined(CONFIG_CMD_DNS)
 109 #include "dns.h"
 110 #endif
 111 #include "link_local.h"
 112 #include "nfs.h"
 113 #include "ping.h"
 114 #include "rarp.h"
 115 #if defined(CONFIG_CMD_SNTP)
 116 #include "sntp.h"
 117 #endif
 118 #if defined(CONFIG_CMD_WOL)
 119 #include "wol.h"
 120 #endif
 121
 122 /** BOOTP EXTENTIONS **/
 123
 124 /* Our subnet mask (0=unknown) */
 125 struct in_addr net_netmask;
 126 /* Our gateways IP address */
 127 struct in_addr net_gateway;
 128 /* Our DNS IP address */
 129 struct in_addr net_dns_server;
 130 #if defined(CONFIG_BOOTP_DNS2)
 131 /* Our 2nd DNS IP address */
 132 struct in_addr net_dns_server2;
 133 #endif
 134
 135 /** END OF BOOTP EXTENTIONS **/
 136
 137 /* Our ethernet address */
 138 u8 net_ethaddr[6];
 139 /* Boot server enet address */
 140 u8 net_server_ethaddr[6];
 141 /* Our IP addr (0 = unknown) */
 142 struct in_addr  net_ip;
 143 /* Server IP addr (0 = unknown) */
 144 struct in_addr  net_server_ip;
 145 /* Current receive packet */
 146 uchar *net_rx_packet;
 147 /* Current rx packet length */
 148 int             net_rx_packet_len;
 149 /* IP packet ID */
 150 static unsigned net_ip_id;
 151 /* Ethernet bcast address */
 152 const u8 net_bcast_ethaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 153 const u8 net_null_ethaddr[6];
 154 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
 155 void (*push_packet)(void *, int len) = 0;
 156 #endif
 157 /* Network loop state */
 158 enum net_loop_state net_state;
 159 /* Tried all network devices */
 160 int             net_restart_wrap;
 161 /* Network loop restarted */
 162 static int      net_restarted;
 163 /* At least one device configured */
 164 static int      net_dev_exists;
 165
 166 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
 167 /* default is without VLAN */
 168 ushort          net_our_vlan = 0xFFFF;
 169 /* ditto */
 170 ushort          net_native_vlan = 0xFFFF;
 171
 172 /* Boot File name */
 173 char net_boot_file_name[1024];
 174 /* Indicates whether the file name was specified on the command line */
 175 bool net_boot_file_name_explicit;
 176 /* The actual transferred size of the bootfile (in bytes) */
 177 u32 net_boot_file_size;
 178 /* Boot file size in blocks as reported by the DHCP server */
 179 u32 net_boot_file_expected_size_in_blocks;
 180
 181 #if defined(CONFIG_CMD_SNTP)
 182 /* NTP server IP address */
 183 struct in_addr  net_ntp_server;
 184 /* offset time from UTC */
 185 int             net_ntp_time_offset;
 186 #endif
 187
 188 static uchar net_pkt_buf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 189 /* Receive packets */
 190 uchar *net_rx_packets[PKTBUFSRX];
 191 /* Current UDP RX packet handler */
 192 static rxhand_f *udp_packet_handler;
 193 /* Current ARP RX packet handler */
 194 static rxhand_f *arp_packet_handler;
 195 #ifdef CONFIG_CMD_TFTPPUT
 196 /* Current ICMP rx handler */
 197 static rxhand_icmp_f *packet_icmp_handler;
 198 #endif
 199 /* Current timeout handler */
 200 static thand_f *time_handler;
 201 /* Time base value */
 202 static ulong    time_start;
 203 /* Current timeout value */
 204 static ulong    time_delta;
 205 /* THE transmit packet */
 206 uchar *net_tx_packet;
 207
 208 static int net_check_prereq(enum proto_t protocol);
 209
 210 static int net_try_count;
 211
 212 int __maybe_unused net_busy_flag;
 213
 214 /**********************************************************************/
 215
 216 static int on_ipaddr(const char *name, const char *value, enum env_op op,
 217         int flags)
 218 {
 219         if (flags & H_PROGRAMMATIC)
 220                 return 0;
 221
 222         net_ip = string_to_ip(value);
 223
 224         return 0;
 225 }
 226 U_BOOT_ENV_CALLBACK(ipaddr, on_ipaddr);
 227
 228 static int on_gatewayip(const char *name, const char *value, enum env_op op,
 229         int flags)
 230 {
 231         if (flags & H_PROGRAMMATIC)
 232                 return 0;
 233
 234         net_gateway = string_to_ip(value);
 235
 236         return 0;
 237 }
 238 U_BOOT_ENV_CALLBACK(gatewayip, on_gatewayip);
 239
 240 static int on_netmask(const char *name, const char *value, enum env_op op,
 241         int flags)
 242 {
 243         if (flags & H_PROGRAMMATIC)
 244                 return 0;
 245
 246         net_netmask = string_to_ip(value);
 247
 248         return 0;
 249 }
 250 U_BOOT_ENV_CALLBACK(netmask, on_netmask);
 251
 252 static int on_serverip(const char *name, const char *value, enum env_op op,
 253         int flags)
 254 {
 255         if (flags & H_PROGRAMMATIC)
 256                 return 0;
 257
 258         net_server_ip = string_to_ip(value);
 259
 260         return 0;
 261 }
 262 U_BOOT_ENV_CALLBACK(serverip, on_serverip);
 263
 264 static int on_nvlan(const char *name, const char *value, enum env_op op,
 265         int flags)
 266 {
 267         if (flags & H_PROGRAMMATIC)
 268                 return 0;
 269
 270         net_native_vlan = string_to_vlan(value);
 271
 272         return 0;
 273 }
 274 U_BOOT_ENV_CALLBACK(nvlan, on_nvlan);
 275
 276 static int on_vlan(const char *name, const char *value, enum env_op op,
 277         int flags)
 278 {
 279         if (flags & H_PROGRAMMATIC)
 280                 return 0;
 281
 282         net_our_vlan = string_to_vlan(value);
 283
 284         return 0;
 285 }
 286 U_BOOT_ENV_CALLBACK(vlan, on_vlan);
 287
 288 #if defined(CONFIG_CMD_DNS)
 289 static int on_dnsip(const char *name, const char *value, enum env_op op,
 290         int flags)
 291 {
 292         if (flags & H_PROGRAMMATIC)
 293                 return 0;
 294
 295         net_dns_server = string_to_ip(value);
 296
 297         return 0;
 298 }
 299 U_BOOT_ENV_CALLBACK(dnsip, on_dnsip);
 300 #endif
 301
 302 /*
 303  * Check if autoload is enabled. If so, use either NFS or TFTP to download
 304  * the boot file.
 305  */
 306 void net_auto_load(void)
 307 {
 308 #if defined(CONFIG_CMD_NFS)
 309         const char *s = env_get("autoload");
 310
 311         if (s != NULL && strcmp(s, "NFS") == 0) {
 312                 if (net_check_prereq(NFS)) {
 313 /* We aren't expecting to get a serverip, so just accept the assigned IP */
 314 #ifdef CONFIG_BOOTP_SERVERIP
 315                         net_set_state(NETLOOP_SUCCESS);
 316 #else
 317                         printf("Cannot autoload with NFS\n");
 318                         net_set_state(NETLOOP_FAIL);
 319 #endif
 320                         return;
 321                 }
 322                 /*
 323                  * Use NFS to load the bootfile.
 324                  */
 325                 nfs_start();
 326                 return;
 327         }
 328 #endif
 329         if (env_get_yesno("autoload") == 0) {
 330                 /*
 331                  * Just use BOOTP/RARP to configure system;
 332                  * Do not use TFTP to load the bootfile.
 333                  */
 334                 net_set_state(NETLOOP_SUCCESS);
 335                 return;
 336         }
 337         if (net_check_prereq(TFTPGET)) {
 338 /* We aren't expecting to get a serverip, so just accept the assigned IP */
 339 #ifdef CONFIG_BOOTP_SERVERIP
 340                 net_set_state(NETLOOP_SUCCESS);
 341 #else
 342                 printf("Cannot autoload with TFTPGET\n");
 343                 net_set_state(NETLOOP_FAIL);
 344 #endif
 345                 return;
 346         }
 347         tftp_start(TFTPGET);
 348 }
 349
 350 static void net_init_loop(void)
 351 {
 352         if (eth_get_dev())
 353                 memcpy(net_ethaddr, eth_get_ethaddr(), 6);
 354
 355         return;
 356 }
 357
 358 static void net_clear_handlers(void)
 359 {
 360         net_set_udp_handler(NULL);
 361         net_set_arp_handler(NULL);
 362         net_set_timeout_handler(0, NULL);
 363 }
 364
 365 static void net_cleanup_loop(void)
 366 {
 367         net_clear_handlers();
 368 }
 369
 370 void net_init(void)
 371 {
 372         static int first_call = 1;
 373
 374         if (first_call) {
 375                 /*
 376                  *      Setup packet buffers, aligned correctly.
 377                  */
 378                 int i;
 379
 380                 net_tx_packet = &net_pkt_buf[0] + (PKTALIGN - 1);
 381                 net_tx_packet -= (ulong)net_tx_packet % PKTALIGN;
 382                 for (i = 0; i < PKTBUFSRX; i++) {
 383                         net_rx_packets[i] = net_tx_packet +
 384                                 (i + 1) * PKTSIZE_ALIGN;
 385                 }
 386                 arp_init();
 387                 net_clear_handlers();
 388
 389                 /* Only need to setup buffer pointers once. */
 390                 first_call = 0;
 391         }
 392
 393         net_init_loop();
 394 }
 395
 396 /**********************************************************************/
 397 /*
 398  *      Main network processing loop.
 399  */
 400
 401 int net_loop(enum proto_t protocol)
 402 {
 403         int ret = -EINVAL;
 404         enum net_loop_state prev_net_state = net_state;
 405
 406         net_restarted = 0;
 407         net_dev_exists = 0;
 408         net_try_count = 1;
 409         debug_cond(DEBUG_INT_STATE, "--- net_loop Entry\n");
 410
 411         bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
 412         net_init();
 413         if (eth_is_on_demand_init() || protocol != NETCONS) {
 414                 eth_halt();
 415                 eth_set_current();
 416                 ret = eth_init();
 417                 if (ret < 0) {
 418                         eth_halt();
 419                         return ret;
 420                 }
 421         } else {
 422                 eth_init_state_only();
 423         }
 424 restart:
 425 #ifdef CONFIG_USB_KEYBOARD
 426         net_busy_flag = 0;
 427 #endif
 428         net_set_state(NETLOOP_CONTINUE);
 429
 430         /*
 431          *      Start the ball rolling with the given start function.  From
 432          *      here on, this code is a state machine driven by received
 433          *      packets and timer events.
 434          */
 435         debug_cond(DEBUG_INT_STATE, "--- net_loop Init\n");
 436         net_init_loop();
 437
 438         switch (net_check_prereq(protocol)) {
 439         case 1:
 440                 /* network not configured */
 441                 eth_halt();
 442                 net_set_state(prev_net_state);
 443                 return -ENODEV;
 444
 445         case 2:
 446                 /* network device not configured */
 447                 break;
 448
 449         case 0:
 450                 net_dev_exists = 1;
 451                 net_boot_file_size = 0;
 452                 switch (protocol) {
 453                 case TFTPGET:
 454 #ifdef CONFIG_CMD_TFTPPUT
 455                 case TFTPPUT:
 456 #endif
 457                         /* always use ARP to get server ethernet address */
 458                         tftp_start(protocol);
 459                         break;
 460 #ifdef CONFIG_CMD_TFTPSRV
 461                 case TFTPSRV:
 462                         tftp_start_server();
 463                         break;
 464 #endif
 465 #ifdef CONFIG_UDP_FUNCTION_FASTBOOT
 466                 case FASTBOOT:
 467                         fastboot_start_server();
 468                         break;
 469 #endif
 470 #if defined(CONFIG_CMD_DHCP)
 471                 case DHCP:
 472                         bootp_reset();
 473                         net_ip.s_addr = 0;
 474                         dhcp_request();         /* Basically same as BOOTP */
 475                         break;
 476 #endif
 477
 478                 case BOOTP:
 479                         bootp_reset();
 480                         net_ip.s_addr = 0;
 481                         bootp_request();
 482                         break;
 483
 484 #if defined(CONFIG_CMD_RARP)
 485                 case RARP:
 486                         rarp_try = 0;
 487                         net_ip.s_addr = 0;
 488                         rarp_request();
 489                         break;
 490 #endif
 491 #if defined(CONFIG_CMD_PING)
 492                 case PING:
 493                         ping_start();
 494                         break;
 495 #endif
 496 #if defined(CONFIG_CMD_NFS)
 497                 case NFS:
 498                         nfs_start();
 499                         break;
 500 #endif
 501 #if defined(CONFIG_CMD_CDP)
 502                 case CDP:
 503                         cdp_start();
 504                         break;
 505 #endif
 506 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
 507                 case NETCONS:
 508                         nc_start();
 509                         break;
 510 #endif
 511 #if defined(CONFIG_CMD_SNTP)
 512                 case SNTP:
 513                         sntp_start();
 514                         break;
 515 #endif
 516 #if defined(CONFIG_CMD_DNS)
 517                 case DNS:
 518                         dns_start();
 519                         break;
 520 #endif
 521 #if defined(CONFIG_CMD_LINK_LOCAL)
 522                 case LINKLOCAL:
 523                         link_local_start();
 524                         break;
 525 #endif
 526 #if defined(CONFIG_CMD_WOL)
 527                 case WOL:
 528                         wol_start();
 529                         break;
 530 #endif
 531                 default:
 532                         break;
 533                 }
 534
 535                 break;
 536         }
 537
 538 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 539 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 540         defined(CONFIG_LED_STATUS)                      && \
 541         defined(CONFIG_LED_STATUS_RED)
 542         /*
 543          * Echo the inverted link state to the fault LED.
 544          */
 545         if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
 546                 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_OFF);
 547         else
 548                 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_ON);
 549 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 550 #endif /* CONFIG_MII, ... */
 551 #ifdef CONFIG_USB_KEYBOARD
 552         net_busy_flag = 1;
 553 #endif
 554
 555         /*
 556          *      Main packet reception loop.  Loop receiving packets until
 557          *      someone sets `net_state' to a state that terminates.
 558          */
 559         for (;;) {
 560                 WATCHDOG_RESET();
 561 #ifdef CONFIG_SHOW_ACTIVITY
 562                 show_activity(1);
 563 #endif
 564                 if (arp_timeout_check() > 0)
 565                         time_start = get_timer(0);
 566
 567                 /*
 568                  *      Check the ethernet for a new packet.  The ethernet
 569                  *      receive routine will process it.
 570                  *      Most drivers return the most recent packet size, but not
 571                  *      errors that may have happened.
 572                  */
 573                 eth_rx();
 574
 575                 /*
 576                  *      Abort if ctrl-c was pressed.
 577                  */
 578                 if (ctrlc()) {
 579                         /* cancel any ARP that may not have completed */
 580                         net_arp_wait_packet_ip.s_addr = 0;
 581
 582                         net_cleanup_loop();
 583                         eth_halt();
 584                         /* Invalidate the last protocol */
 585                         eth_set_last_protocol(BOOTP);
 586
 587                         puts("\nAbort\n");
 588                         /* include a debug print as well incase the debug
 589                            messages are directed to stderr */
 590                         debug_cond(DEBUG_INT_STATE, "--- net_loop Abort!\n");
 591                         ret = -EINTR;
 592                         goto done;
 593                 }
 594
 595                 /*
 596                  *      Check for a timeout, and run the timeout handler
 597                  *      if we have one.
 598                  */
 599                 if (time_handler &&
 600                     ((get_timer(0) - time_start) > time_delta)) {
 601                         thand_f *x;
 602
 603 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 604 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 605         defined(CONFIG_LED_STATUS)                      && \
 606         defined(CONFIG_LED_STATUS_RED)
 607                         /*
 608                          * Echo the inverted link state to the fault LED.
 609                          */
 610                         if (miiphy_link(eth_get_dev()->name,
 611                                         CONFIG_SYS_FAULT_MII_ADDR))
 612                                 status_led_set(CONFIG_LED_STATUS_RED,
 613                                                CONFIG_LED_STATUS_OFF);
 614                         else
 615                                 status_led_set(CONFIG_LED_STATUS_RED,
 616                                                CONFIG_LED_STATUS_ON);
 617 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 618 #endif /* CONFIG_MII, ... */
 619                         debug_cond(DEBUG_INT_STATE, "--- net_loop timeout\n");
 620                         x = time_handler;
 621                         time_handler = (thand_f *)0;
 622                         (*x)();
 623                 }
 624
 625                 if (net_state == NETLOOP_FAIL)
 626                         ret = net_start_again();
 627
 628                 switch (net_state) {
 629                 case NETLOOP_RESTART:
 630                         net_restarted = 1;
 631                         goto restart;
 632
 633                 case NETLOOP_SUCCESS:
 634                         net_cleanup_loop();
 635                         if (net_boot_file_size > 0) {
 636                                 printf("Bytes transferred = %d (%x hex)\n",
 637                                        net_boot_file_size, net_boot_file_size);
 638                                 env_set_hex("filesize", net_boot_file_size);
 639                                 env_set_hex("fileaddr", load_addr);
 640                         }
 641                         if (protocol != NETCONS)
 642                                 eth_halt();
 643                         else
 644                                 eth_halt_state_only();
 645
 646                         eth_set_last_protocol(protocol);
 647
 648                         ret = net_boot_file_size;
 649                         debug_cond(DEBUG_INT_STATE, "--- net_loop Success!\n");
 650                         goto done;
 651
 652                 case NETLOOP_FAIL:
 653                         net_cleanup_loop();
 654                         /* Invalidate the last protocol */
 655                         eth_set_last_protocol(BOOTP);
 656                         debug_cond(DEBUG_INT_STATE, "--- net_loop Fail!\n");
 657                         ret = -ENONET;
 658                         goto done;
 659
 660                 case NETLOOP_CONTINUE:
 661                         continue;
 662                 }
 663         }
 664
 665 done:
 666 #ifdef CONFIG_USB_KEYBOARD
 667         net_busy_flag = 0;
 668 #endif
 669 #ifdef CONFIG_CMD_TFTPPUT
 670         /* Clear out the handlers */
 671         net_set_udp_handler(NULL);
 672         net_set_icmp_handler(NULL);
 673 #endif
 674         net_set_state(prev_net_state);
 675         return ret;
 676 }
 677
 678 /**********************************************************************/
 679
 680 static void start_again_timeout_handler(void)
 681 {
 682         net_set_state(NETLOOP_RESTART);
 683 }
 684
 685 int net_start_again(void)
 686 {
 687         char *nretry;
 688         int retry_forever = 0;
 689         unsigned long retrycnt = 0;
 690         int ret;
 691
 692         nretry = env_get("netretry");
 693         if (nretry) {
 694                 if (!strcmp(nretry, "yes"))
 695                         retry_forever = 1;
 696                 else if (!strcmp(nretry, "no"))
 697                         retrycnt = 0;
 698                 else if (!strcmp(nretry, "once"))
 699                         retrycnt = 1;
 700                 else
 701                         retrycnt = simple_strtoul(nretry, NULL, 0);
 702         } else {
 703                 retrycnt = 0;
 704                 retry_forever = 0;
 705         }
 706
 707         if ((!retry_forever) && (net_try_count > retrycnt)) {
 708                 eth_halt();
 709                 net_set_state(NETLOOP_FAIL);
 710                 /*
 711                  * We don't provide a way for the protocol to return an error,
 712                  * but this is almost always the reason.
 713                  */
 714                 return -ETIMEDOUT;
 715         }
 716
 717         net_try_count++;
 718
 719         eth_halt();
 720 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
 721         eth_try_another(!net_restarted);
 722 #endif
 723         ret = eth_init();
 724         if (net_restart_wrap) {
 725                 net_restart_wrap = 0;
 726                 if (net_dev_exists) {
 727                         net_set_timeout_handler(10000UL,
 728                                                 start_again_timeout_handler);
 729                         net_set_udp_handler(NULL);
 730                 } else {
 731                         net_set_state(NETLOOP_FAIL);
 732                 }
 733         } else {
 734                 net_set_state(NETLOOP_RESTART);
 735         }
 736         return ret;
 737 }
 738
 739 /**********************************************************************/
 740 /*
 741  *      Miscelaneous bits.
 742  */
 743
 744 static void dummy_handler(uchar *pkt, unsigned dport,
 745                         struct in_addr sip, unsigned sport,
 746                         unsigned len)
 747 {
 748 }
 749
 750 rxhand_f *net_get_udp_handler(void)
 751 {
 752         return udp_packet_handler;
 753 }
 754
 755 void net_set_udp_handler(rxhand_f *f)
 756 {
 757         debug_cond(DEBUG_INT_STATE, "--- net_loop UDP handler set (%p)\n", f);
 758         if (f == NULL)
 759                 udp_packet_handler = dummy_handler;
 760         else
 761                 udp_packet_handler = f;
 762 }
 763
 764 rxhand_f *net_get_arp_handler(void)
 765 {
 766         return arp_packet_handler;
 767 }
 768
 769 void net_set_arp_handler(rxhand_f *f)
 770 {
 771         debug_cond(DEBUG_INT_STATE, "--- net_loop ARP handler set (%p)\n", f);
 772         if (f == NULL)
 773                 arp_packet_handler = dummy_handler;
 774         else
 775                 arp_packet_handler = f;
 776 }
 777
 778 #ifdef CONFIG_CMD_TFTPPUT
 779 void net_set_icmp_handler(rxhand_icmp_f *f)
 780 {
 781         packet_icmp_handler = f;
 782 }
 783 #endif
 784
 785 void net_set_timeout_handler(ulong iv, thand_f *f)
 786 {
 787         if (iv == 0) {
 788                 debug_cond(DEBUG_INT_STATE,
 789                            "--- net_loop timeout handler cancelled\n");
 790                 time_handler = (thand_f *)0;
 791         } else {
 792                 debug_cond(DEBUG_INT_STATE,
 793                            "--- net_loop timeout handler set (%p)\n", f);
 794                 time_handler = f;
 795                 time_start = get_timer(0);
 796                 time_delta = iv * CONFIG_SYS_HZ / 1000;
 797         }
 798 }
 799
 800 uchar *net_get_async_tx_pkt_buf(void)
 801 {
 802         if (arp_is_waiting())
 803                 return arp_tx_packet; /* If we are waiting, we already sent */
 804         else
 805                 return net_tx_packet;
 806 }
 807
 808 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
 809                 int payload_len)
 810 {
 811         return net_send_ip_packet(ether, dest, dport, sport, payload_len,
 812                                   IPPROTO_UDP, 0, 0, 0);
 813 }
 814
 815 int net_send_ip_packet(uchar *ether, struct in_addr dest, int dport, int sport,
 816                        int payload_len, int proto, u8 action, u32 tcp_seq_num,
 817                        u32 tcp_ack_num)
 818 {
 819         uchar *pkt;
 820         int eth_hdr_size;
 821         int pkt_hdr_size;
 822
 823         /* make sure the net_tx_packet is initialized (net_init() was called) */
 824         assert(net_tx_packet != NULL);
 825         if (net_tx_packet == NULL)
 826                 return -1;
 827
 828         /* convert to new style broadcast */
 829         if (dest.s_addr == 0)
 830                 dest.s_addr = 0xFFFFFFFF;
 831
 832         /* if broadcast, make the ether address a broadcast and don't do ARP */
 833         if (dest.s_addr == 0xFFFFFFFF)
 834                 ether = (uchar *)net_bcast_ethaddr;
 835
 836         pkt = (uchar *)net_tx_packet;
 837
 838         eth_hdr_size = net_set_ether(pkt, ether, PROT_IP);
 839
 840         switch (proto) {
 841         case IPPROTO_UDP:
 842                 net_set_udp_header(pkt + eth_hdr_size, dest, dport, sport,
 843                                    payload_len);
 844                 pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
 845                 break;
 846         default:
 847                 return -EINVAL;
 848         }
 849
 850         /* if MAC address was not discovered yet, do an ARP request */
 851         if (memcmp(ether, net_null_ethaddr, 6) == 0) {
 852                 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest);
 853
 854                 /* save the ip and eth addr for the packet to send after arp */
 855                 net_arp_wait_packet_ip = dest;
 856                 arp_wait_packet_ethaddr = ether;
 857
 858                 /* size of the waiting packet */
 859                 arp_wait_tx_packet_size = pkt_hdr_size + payload_len;
 860
 861                 /* and do the ARP request */
 862                 arp_wait_try = 1;
 863                 arp_wait_timer_start = get_timer(0);
 864                 arp_request();
 865                 return 1;       /* waiting */
 866         } else {
 867                 debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
 868                            &dest, ether);
 869                 net_send_packet(net_tx_packet, pkt_hdr_size + payload_len);
 870                 return 0;       /* transmitted */
 871         }
 872 }
 873
 874 #ifdef CONFIG_IP_DEFRAG
 875 /*
 876  * This function collects fragments in a single packet, according
 877  * to the algorithm in RFC815. It returns NULL or the pointer to
 878  * a complete packet, in static storage
 879  */
 880 #ifndef CONFIG_NET_MAXDEFRAG
 881 #define CONFIG_NET_MAXDEFRAG 16384
 882 #endif
 883 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG)
 884
 885 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE)
 886
 887 /*
 888  * this is the packet being assembled, either data or frag control.
 889  * Fragments go by 8 bytes, so this union must be 8 bytes long
 890  */
 891 struct hole {
 892         /* first_byte is address of this structure */
 893         u16 last_byte;  /* last byte in this hole + 1 (begin of next hole) */
 894         u16 next_hole;  /* index of next (in 8-b blocks), 0 == none */
 895         u16 prev_hole;  /* index of prev, 0 == none */
 896         u16 unused;
 897 };
 898
 899 static struct ip_udp_hdr *__net_defragment(struct ip_udp_hdr *ip, int *lenp)
 900 {
 901         static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
 902         static u16 first_hole, total_len;
 903         struct hole *payload, *thisfrag, *h, *newh;
 904         struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff;
 905         uchar *indata = (uchar *)ip;
 906         int offset8, start, len, done = 0;
 907         u16 ip_off = ntohs(ip->ip_off);
 908
 909         /* payload starts after IP header, this fragment is in there */
 910         payload = (struct hole *)(pkt_buff + IP_HDR_SIZE);
 911         offset8 =  (ip_off & IP_OFFS);
 912         thisfrag = payload + offset8;
 913         start = offset8 * 8;
 914         len = ntohs(ip->ip_len) - IP_HDR_SIZE;
 915
 916         if (start + len > IP_MAXUDP) /* fragment extends too far */
 917                 return NULL;
 918
 919         if (!total_len || localip->ip_id != ip->ip_id) {
 920                 /* new (or different) packet, reset structs */
 921                 total_len = 0xffff;
 922                 payload[0].last_byte = ~0;
 923                 payload[0].next_hole = 0;
 924                 payload[0].prev_hole = 0;
 925                 first_hole = 0;
 926                 /* any IP header will work, copy the first we received */
 927                 memcpy(localip, ip, IP_HDR_SIZE);
 928         }
 929
 930         /*
 931          * What follows is the reassembly algorithm. We use the payload
 932          * array as a linked list of hole descriptors, as each hole starts
 933          * at a multiple of 8 bytes. However, last byte can be whatever value,
 934          * so it is represented as byte count, not as 8-byte blocks.
 935          */
 936
 937         h = payload + first_hole;
 938         while (h->last_byte < start) {
 939                 if (!h->next_hole) {
 940                         /* no hole that far away */
 941                         return NULL;
 942                 }
 943                 h = payload + h->next_hole;
 944         }
 945
 946         /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
 947         if (offset8 + ((len + 7) / 8) <= h - payload) {
 948                 /* no overlap with holes (dup fragment?) */
 949                 return NULL;
 950         }
 951
 952         if (!(ip_off & IP_FLAGS_MFRAG)) {
 953                 /* no more fragmentss: truncate this (last) hole */
 954                 total_len = start + len;
 955                 h->last_byte = start + len;
 956         }
 957
 958         /*
 959          * There is some overlap: fix the hole list. This code doesn't
 960          * deal with a fragment that overlaps with two different holes
 961          * (thus being a superset of a previously-received fragment).
 962          */
 963
 964         if ((h >= thisfrag) && (h->last_byte <= start + len)) {
 965                 /* complete overlap with hole: remove hole */
 966                 if (!h->prev_hole && !h->next_hole) {
 967                         /* last remaining hole */
 968                         done = 1;
 969                 } else if (!h->prev_hole) {
 970                         /* first hole */
 971                         first_hole = h->next_hole;
 972                         payload[h->next_hole].prev_hole = 0;
 973                 } else if (!h->next_hole) {
 974                         /* last hole */
 975                         payload[h->prev_hole].next_hole = 0;
 976                 } else {
 977                         /* in the middle of the list */
 978                         payload[h->next_hole].prev_hole = h->prev_hole;
 979                         payload[h->prev_hole].next_hole = h->next_hole;
 980                 }
 981
 982         } else if (h->last_byte <= start + len) {
 983                 /* overlaps with final part of the hole: shorten this hole */
 984                 h->last_byte = start;
 985
 986         } else if (h >= thisfrag) {
 987                 /* overlaps with initial part of the hole: move this hole */
 988                 newh = thisfrag + (len / 8);
 989                 *newh = *h;
 990                 h = newh;
 991                 if (h->next_hole)
 992                         payload[h->next_hole].prev_hole = (h - payload);
 993                 if (h->prev_hole)
 994                         payload[h->prev_hole].next_hole = (h - payload);
 995                 else
 996                         first_hole = (h - payload);
 997
 998         } else {
 999                 /* fragment sits in the middle: split the hole */
1000                 newh = thisfrag + (len / 8);
1001                 *newh = *h;
1002                 h->last_byte = start;
1003                 h->next_hole = (newh - payload);
1004                 newh->prev_hole = (h - payload);
1005                 if (newh->next_hole)
1006                         payload[newh->next_hole].prev_hole = (newh - payload);
1007         }
1008
1009         /* finally copy this fragment and possibly return whole packet */
1010         memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len);
1011         if (!done)
1012                 return NULL;
1013
1014         localip->ip_len = htons(total_len);
1015         *lenp = total_len + IP_HDR_SIZE;
1016         return localip;
1017 }
1018
1019 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
1020         int *lenp)
1021 {
1022         u16 ip_off = ntohs(ip->ip_off);
1023         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1024                 return ip; /* not a fragment */
1025         return __net_defragment(ip, lenp);
1026 }
1027
1028 #else /* !CONFIG_IP_DEFRAG */
1029
1030 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
1031         int *lenp)
1032 {
1033         u16 ip_off = ntohs(ip->ip_off);
1034         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1035                 return ip; /* not a fragment */
1036         return NULL;
1037 }
1038 #endif
1039
1040 /**
1041  * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
1042  * drop others.
1043  *
1044  * @parma ip    IP packet containing the ICMP
1045  */
1046 static void receive_icmp(struct ip_udp_hdr *ip, int len,
1047                         struct in_addr src_ip, struct ethernet_hdr *et)
1048 {
1049         struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
1050
1051         switch (icmph->type) {
1052         case ICMP_REDIRECT:
1053                 if (icmph->code != ICMP_REDIR_HOST)
1054                         return;
1055                 printf(" ICMP Host Redirect to %pI4 ",
1056                        &icmph->un.gateway);
1057                 break;
1058         default:
1059 #if defined(CONFIG_CMD_PING)
1060                 ping_receive(et, ip, len);
1061 #endif
1062 #ifdef CONFIG_CMD_TFTPPUT
1063                 if (packet_icmp_handler)
1064                         packet_icmp_handler(icmph->type, icmph->code,
1065                                             ntohs(ip->udp_dst), src_ip,
1066                                             ntohs(ip->udp_src), icmph->un.data,
1067                                             ntohs(ip->udp_len));
1068 #endif
1069                 break;
1070         }
1071 }
1072
1073 void net_process_received_packet(uchar *in_packet, int len)
1074 {
1075         struct ethernet_hdr *et;
1076         struct ip_udp_hdr *ip;
1077         struct in_addr dst_ip;
1078         struct in_addr src_ip;
1079         int eth_proto;
1080 #if defined(CONFIG_CMD_CDP)
1081         int iscdp;
1082 #endif
1083         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1084
1085         debug_cond(DEBUG_NET_PKT, "packet received\n");
1086
1087         net_rx_packet = in_packet;
1088         net_rx_packet_len = len;
1089         et = (struct ethernet_hdr *)in_packet;
1090
1091         /* too small packet? */
1092         if (len < ETHER_HDR_SIZE)
1093                 return;
1094
1095 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
1096         if (push_packet) {
1097                 (*push_packet)(in_packet, len);
1098                 return;
1099         }
1100 #endif
1101
1102 #if defined(CONFIG_CMD_CDP)
1103         /* keep track if packet is CDP */
1104         iscdp = is_cdp_packet(et->et_dest);
1105 #endif
1106
1107         myvlanid = ntohs(net_our_vlan);
1108         if (myvlanid == (ushort)-1)
1109                 myvlanid = VLAN_NONE;
1110         mynvlanid = ntohs(net_native_vlan);
1111         if (mynvlanid == (ushort)-1)
1112                 mynvlanid = VLAN_NONE;
1113
1114         eth_proto = ntohs(et->et_protlen);
1115
1116         if (eth_proto < 1514) {
1117                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1118                 /*
1119                  *      Got a 802.2 packet.  Check the other protocol field.
1120                  *      XXX VLAN over 802.2+SNAP not implemented!
1121                  */
1122                 eth_proto = ntohs(et802->et_prot);
1123
1124                 ip = (struct ip_udp_hdr *)(in_packet + E802_HDR_SIZE);
1125                 len -= E802_HDR_SIZE;
1126
1127         } else if (eth_proto != PROT_VLAN) {    /* normal packet */
1128                 ip = (struct ip_udp_hdr *)(in_packet + ETHER_HDR_SIZE);
1129                 len -= ETHER_HDR_SIZE;
1130
1131         } else {                        /* VLAN packet */
1132                 struct vlan_ethernet_hdr *vet =
1133                         (struct vlan_ethernet_hdr *)et;
1134
1135                 debug_cond(DEBUG_NET_PKT, "VLAN packet received\n");
1136
1137                 /* too small packet? */
1138                 if (len < VLAN_ETHER_HDR_SIZE)
1139                         return;
1140
1141                 /* if no VLAN active */
1142                 if ((ntohs(net_our_vlan) & VLAN_IDMASK) == VLAN_NONE
1143 #if defined(CONFIG_CMD_CDP)
1144                                 && iscdp == 0
1145 #endif
1146                                 )
1147                         return;
1148
1149                 cti = ntohs(vet->vet_tag);
1150                 vlanid = cti & VLAN_IDMASK;
1151                 eth_proto = ntohs(vet->vet_type);
1152
1153                 ip = (struct ip_udp_hdr *)(in_packet + VLAN_ETHER_HDR_SIZE);
1154                 len -= VLAN_ETHER_HDR_SIZE;
1155         }
1156
1157         debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto);
1158
1159 #if defined(CONFIG_CMD_CDP)
1160         if (iscdp) {
1161                 cdp_receive((uchar *)ip, len);
1162                 return;
1163         }
1164 #endif
1165
1166         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1167                 if (vlanid == VLAN_NONE)
1168                         vlanid = (mynvlanid & VLAN_IDMASK);
1169                 /* not matched? */
1170                 if (vlanid != (myvlanid & VLAN_IDMASK))
1171                         return;
1172         }
1173
1174         switch (eth_proto) {
1175         case PROT_ARP:
1176                 arp_receive(et, ip, len);
1177                 break;
1178
1179 #ifdef CONFIG_CMD_RARP
1180         case PROT_RARP:
1181                 rarp_receive(ip, len);
1182                 break;
1183 #endif
1184         case PROT_IP:
1185                 debug_cond(DEBUG_NET_PKT, "Got IP\n");
1186                 /* Before we start poking the header, make sure it is there */
1187                 if (len < IP_UDP_HDR_SIZE) {
1188                         debug("len bad %d < %lu\n", len,
1189                               (ulong)IP_UDP_HDR_SIZE);
1190                         return;
1191                 }
1192                 /* Check the packet length */
1193                 if (len < ntohs(ip->ip_len)) {
1194                         debug("len bad %d < %d\n", len, ntohs(ip->ip_len));
1195                         return;
1196                 }
1197                 len = ntohs(ip->ip_len);
1198                 debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n",
1199                            len, ip->ip_hl_v & 0xff);
1200
1201                 /* Can't deal with anything except IPv4 */
1202                 if ((ip->ip_hl_v & 0xf0) != 0x40)
1203                         return;
1204                 /* Can't deal with IP options (headers != 20 bytes) */
1205                 if ((ip->ip_hl_v & 0x0f) > 0x05)
1206                         return;
1207                 /* Check the Checksum of the header */
1208                 if (!ip_checksum_ok((uchar *)ip, IP_HDR_SIZE)) {
1209                         debug("checksum bad\n");
1210                         return;
1211                 }
1212                 /* If it is not for us, ignore it */
1213                 dst_ip = net_read_ip(&ip->ip_dst);
1214                 if (net_ip.s_addr && dst_ip.s_addr != net_ip.s_addr &&
1215                     dst_ip.s_addr != 0xFFFFFFFF) {
1216                                 return;
1217                 }
1218                 /* Read source IP address for later use */
1219                 src_ip = net_read_ip(&ip->ip_src);
1220                 /*
1221                  * The function returns the unchanged packet if it's not
1222                  * a fragment, and either the complete packet or NULL if
1223                  * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1224                  */
1225                 ip = net_defragment(ip, &len);
1226                 if (!ip)
1227                         return;
1228                 /*
1229                  * watch for ICMP host redirects
1230                  *
1231                  * There is no real handler code (yet). We just watch
1232                  * for ICMP host redirect messages. In case anybody
1233                  * sees these messages: please contact me
1234                  * (wd@denx.de), or - even better - send me the
1235                  * necessary fixes :-)
1236                  *
1237                  * Note: in all cases where I have seen this so far
1238                  * it was a problem with the router configuration,
1239                  * for instance when a router was configured in the
1240                  * BOOTP reply, but the TFTP server was on the same
1241                  * subnet. So this is probably a warning that your
1242                  * configuration might be wrong. But I'm not really
1243                  * sure if there aren't any other situations.
1244                  *
1245                  * Simon Glass <sjg@chromium.org>: We get an ICMP when
1246                  * we send a tftp packet to a dead connection, or when
1247                  * there is no server at the other end.
1248                  */
1249                 if (ip->ip_p == IPPROTO_ICMP) {
1250                         receive_icmp(ip, len, src_ip, et);
1251                         return;
1252                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1253                         return;
1254                 }
1255
1256                 debug_cond(DEBUG_DEV_PKT,
1257                            "received UDP (to=%pI4, from=%pI4, len=%d)\n",
1258                            &dst_ip, &src_ip, len);
1259
1260 #ifdef CONFIG_UDP_CHECKSUM
1261                 if (ip->udp_xsum != 0) {
1262                         ulong   xsum;
1263                         ushort *sumptr;
1264                         ushort  sumlen;
1265
1266                         xsum  = ip->ip_p;
1267                         xsum += (ntohs(ip->udp_len));
1268                         xsum += (ntohl(ip->ip_src.s_addr) >> 16) & 0x0000ffff;
1269                         xsum += (ntohl(ip->ip_src.s_addr) >>  0) & 0x0000ffff;
1270                         xsum += (ntohl(ip->ip_dst.s_addr) >> 16) & 0x0000ffff;
1271                         xsum += (ntohl(ip->ip_dst.s_addr) >>  0) & 0x0000ffff;
1272
1273                         sumlen = ntohs(ip->udp_len);
1274                         sumptr = (ushort *)&(ip->udp_src);
1275
1276                         while (sumlen > 1) {
1277                                 ushort sumdata;
1278
1279                                 sumdata = *sumptr++;
1280                                 xsum += ntohs(sumdata);
1281                                 sumlen -= 2;
1282                         }
1283                         if (sumlen > 0) {
1284                                 ushort sumdata;
1285
1286                                 sumdata = *(unsigned char *)sumptr;
1287                                 sumdata = (sumdata << 8) & 0xff00;
1288                                 xsum += sumdata;
1289                         }
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 #endif
1301
1302 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
1303                 nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
1304                                 src_ip,
1305                                 ntohs(ip->udp_dst),
1306                                 ntohs(ip->udp_src),
1307                                 ntohs(ip->udp_len) - UDP_HDR_SIZE);
1308 #endif
1309                 /*
1310                  * IP header OK.  Pass the packet to the current handler.
1311                  */
1312                 (*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE,
1313                                       ntohs(ip->udp_dst),
1314                                       src_ip,
1315                                       ntohs(ip->udp_src),
1316                                       ntohs(ip->udp_len) - UDP_HDR_SIZE);
1317                 break;
1318 #ifdef CONFIG_CMD_WOL
1319         case PROT_WOL:
1320                 wol_receive(ip, len);
1321                 break;
1322 #endif
1323         }
1324 }
1325
1326 /**********************************************************************/
1327
1328 static int net_check_prereq(enum proto_t protocol)
1329 {
1330         switch (protocol) {
1331                 /* Fall through */
1332 #if defined(CONFIG_CMD_PING)
1333         case PING:
1334                 if (net_ping_ip.s_addr == 0) {
1335                         puts("*** ERROR: ping address not given\n");
1336                         return 1;
1337                 }
1338                 goto common;
1339 #endif
1340 #if defined(CONFIG_CMD_SNTP)
1341         case SNTP:
1342                 if (net_ntp_server.s_addr == 0) {
1343                         puts("*** ERROR: NTP server address not given\n");
1344                         return 1;
1345                 }
1346                 goto common;
1347 #endif
1348 #if defined(CONFIG_CMD_DNS)
1349         case DNS:
1350                 if (net_dns_server.s_addr == 0) {
1351                         puts("*** ERROR: DNS server address not given\n");
1352                         return 1;
1353                 }
1354                 goto common;
1355 #endif
1356 #if defined(CONFIG_CMD_NFS)
1357         case NFS:
1358 #endif
1359                 /* Fall through */
1360         case TFTPGET:
1361         case TFTPPUT:
1362                 if (net_server_ip.s_addr == 0 && !is_serverip_in_cmd()) {
1363                         puts("*** ERROR: `serverip' not set\n");
1364                         return 1;
1365                 }
1366 #if     defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
1367         defined(CONFIG_CMD_DNS)
1368 common:
1369 #endif
1370                 /* Fall through */
1371
1372         case NETCONS:
1373         case FASTBOOT:
1374         case TFTPSRV:
1375                 if (net_ip.s_addr == 0) {
1376                         puts("*** ERROR: `ipaddr' not set\n");
1377                         return 1;
1378                 }
1379                 /* Fall through */
1380
1381 #ifdef CONFIG_CMD_RARP
1382         case RARP:
1383 #endif
1384         case BOOTP:
1385         case CDP:
1386         case DHCP:
1387         case LINKLOCAL:
1388                 if (memcmp(net_ethaddr, "\0\0\0\0\0\0", 6) == 0) {
1389                         int num = eth_get_dev_index();
1390
1391                         switch (num) {
1392                         case -1:
1393                                 puts("*** ERROR: No ethernet found.\n");
1394                                 return 1;
1395                         case 0:
1396                                 puts("*** ERROR: `ethaddr' not set\n");
1397                                 break;
1398                         default:
1399                                 printf("*** ERROR: `eth%daddr' not set\n",
1400                                        num);
1401                                 break;
1402                         }
1403
1404                         net_start_again();
1405                         return 2;
1406                 }
1407                 /* Fall through */
1408         default:
1409                 return 0;
1410         }
1411         return 0;               /* OK */
1412 }
1413 /**********************************************************************/
1414
1415 int
1416 net_eth_hdr_size(void)
1417 {
1418         ushort myvlanid;
1419
1420         myvlanid = ntohs(net_our_vlan);
1421         if (myvlanid == (ushort)-1)
1422                 myvlanid = VLAN_NONE;
1423
1424         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1425                 VLAN_ETHER_HDR_SIZE;
1426 }
1427
1428 int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot)
1429 {
1430         struct ethernet_hdr *et = (struct ethernet_hdr *)xet;
1431         ushort myvlanid;
1432
1433         myvlanid = ntohs(net_our_vlan);
1434         if (myvlanid == (ushort)-1)
1435                 myvlanid = VLAN_NONE;
1436
1437         memcpy(et->et_dest, dest_ethaddr, 6);
1438         memcpy(et->et_src, net_ethaddr, 6);
1439         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1440                 et->et_protlen = htons(prot);
1441                 return ETHER_HDR_SIZE;
1442         } else {
1443                 struct vlan_ethernet_hdr *vet =
1444                         (struct vlan_ethernet_hdr *)xet;
1445
1446                 vet->vet_vlan_type = htons(PROT_VLAN);
1447                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1448                 vet->vet_type = htons(prot);
1449                 return VLAN_ETHER_HDR_SIZE;
1450         }
1451 }
1452
1453 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
1454 {
1455         ushort protlen;
1456
1457         memcpy(et->et_dest, addr, 6);
1458         memcpy(et->et_src, net_ethaddr, 6);
1459         protlen = ntohs(et->et_protlen);
1460         if (protlen == PROT_VLAN) {
1461                 struct vlan_ethernet_hdr *vet =
1462                         (struct vlan_ethernet_hdr *)et;
1463                 vet->vet_type = htons(prot);
1464                 return VLAN_ETHER_HDR_SIZE;
1465         } else if (protlen > 1514) {
1466                 et->et_protlen = htons(prot);
1467                 return ETHER_HDR_SIZE;
1468         } else {
1469                 /* 802.2 + SNAP */
1470                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1471                 et802->et_prot = htons(prot);
1472                 return E802_HDR_SIZE;
1473         }
1474 }
1475
1476 void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source,
1477                        u16 pkt_len, u8 proto)
1478 {
1479         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1480
1481         /*
1482          *      Construct an IP header.
1483          */
1484         /* IP_HDR_SIZE / 4 (not including UDP) */
1485         ip->ip_hl_v  = 0x45;
1486         ip->ip_tos   = 0;
1487         ip->ip_len   = htons(pkt_len);
1488         ip->ip_p     = proto;
1489         ip->ip_id    = htons(net_ip_id++);
1490         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1491         ip->ip_ttl   = 255;
1492         ip->ip_sum   = 0;
1493         /* already in network byte order */
1494         net_copy_ip((void *)&ip->ip_src, &source);
1495         /* already in network byte order */
1496         net_copy_ip((void *)&ip->ip_dst, &dest);
1497
1498         ip->ip_sum   = compute_ip_checksum(ip, IP_HDR_SIZE);
1499 }
1500
1501 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport,
1502                         int len)
1503 {
1504         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1505
1506         /*
1507          *      If the data is an odd number of bytes, zero the
1508          *      byte after the last byte so that the checksum
1509          *      will work.
1510          */
1511         if (len & 1)
1512                 pkt[IP_UDP_HDR_SIZE + len] = 0;
1513
1514         net_set_ip_header(pkt, dest, net_ip, IP_UDP_HDR_SIZE + len,
1515                           IPPROTO_UDP);
1516
1517         ip->udp_src  = htons(sport);
1518         ip->udp_dst  = htons(dport);
1519         ip->udp_len  = htons(UDP_HDR_SIZE + len);
1520         ip->udp_xsum = 0;
1521 }
1522
1523 void copy_filename(char *dst, const char *src, int size)
1524 {
1525         if (src && *src && (*src == '"')) {
1526                 ++src;
1527                 --size;
1528         }
1529
1530         while ((--size > 0) && src && *src && (*src != '"'))
1531                 *dst++ = *src++;
1532         *dst = '\0';
1533 }
1534
1535 int is_serverip_in_cmd(void)
1536 {
1537         return !!strchr(net_boot_file_name, ':');
1538 }
1539
1540 int net_parse_bootfile(struct in_addr *ipaddr, char *filename, int max_len)
1541 {
1542         char *colon;
1543
1544         if (net_boot_file_name[0] == '\0')
1545                 return 0;
1546
1547         colon = strchr(net_boot_file_name, ':');
1548         if (colon) {
1549                 if (ipaddr)
1550                         *ipaddr = string_to_ip(net_boot_file_name);
1551                 strncpy(filename, colon + 1, max_len);
1552         } else {
1553                 strncpy(filename, net_boot_file_name, max_len);
1554         }
1555         filename[max_len - 1] = '\0';
1556
1557         return 1;
1558 }
1559
1560 #if     defined(CONFIG_CMD_NFS)         || \
1561         defined(CONFIG_CMD_SNTP)        || \
1562         defined(CONFIG_CMD_DNS)
1563 /*
1564  * make port a little random (1024-17407)
1565  * This keeps the math somewhat trivial to compute, and seems to work with
1566  * all supported protocols/clients/servers
1567  */
1568 unsigned int random_port(void)
1569 {
1570         return 1024 + (get_timer(0) % 0x4000);
1571 }
1572 #endif
1573
1574 void ip_to_string(struct in_addr x, char *s)
1575 {
1576         x.s_addr = ntohl(x.s_addr);
1577         sprintf(s, "%d.%d.%d.%d",
1578                 (int) ((x.s_addr >> 24) & 0xff),
1579                 (int) ((x.s_addr >> 16) & 0xff),
1580                 (int) ((x.s_addr >> 8) & 0xff),
1581                 (int) ((x.s_addr >> 0) & 0xff)
1582         );
1583 }
1584
1585 void vlan_to_string(ushort x, char *s)
1586 {
1587         x = ntohs(x);
1588
1589         if (x == (ushort)-1)
1590                 x = VLAN_NONE;
1591
1592         if (x == VLAN_NONE)
1593                 strcpy(s, "none");
1594         else
1595                 sprintf(s, "%d", x & VLAN_IDMASK);
1596 }
1597
1598 ushort string_to_vlan(const char *s)
1599 {
1600         ushort id;
1601
1602         if (s == NULL)
1603                 return htons(VLAN_NONE);
1604
1605         if (*s < '0' || *s > '9')
1606                 id = VLAN_NONE;
1607         else
1608                 id = (ushort)simple_strtoul(s, NULL, 10);
1609
1610         return htons(id);
1611 }
1612
1613 ushort env_get_vlan(char *var)
1614 {
1615         return string_to_vlan(env_get(var));
1616 }