net/net.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *      Copied from Linux Monitor (LiMon) - Networking.
   4  *
   5  *      Copyright 1994 - 2000 Neil Russell.
   6  *      (See License)
   7  *      Copyright 2000 Roland Borde
   8  *      Copyright 2000 Paolo Scaffardi
   9  *      Copyright 2000-2002 Wolfgang Denk, wd@denx.de
  10  */
  11
  12 /*
  13  * General Desription:
  14  *
  15  * The user interface supports commands for BOOTP, RARP, and TFTP.
  16  * Also, we support ARP internally. Depending on available data,
  17  * these interact as follows:
  18  *
  19  * BOOTP:
  20  *
  21  *      Prerequisites:  - own ethernet address
  22  *      We want:        - own IP address
  23  *                      - TFTP server IP address
  24  *                      - name of bootfile
  25  *      Next step:      ARP
  26  *
  27  * LINK_LOCAL:
  28  *
  29  *      Prerequisites:  - own ethernet address
  30  *      We want:        - own IP address
  31  *      Next step:      ARP
  32  *
  33  * RARP:
  34  *
  35  *      Prerequisites:  - own ethernet address
  36  *      We want:        - own IP address
  37  *                      - TFTP server IP address
  38  *      Next step:      ARP
  39  *
  40  * ARP:
  41  *
  42  *      Prerequisites:  - own ethernet address
  43  *                      - own IP address
  44  *                      - TFTP server IP address
  45  *      We want:        - TFTP server ethernet address
  46  *      Next step:      TFTP
  47  *
  48  * DHCP:
  49  *
  50  *     Prerequisites:   - own ethernet address
  51  *     We want:         - IP, Netmask, ServerIP, Gateway IP
  52  *                      - bootfilename, lease time
  53  *     Next step:       - TFTP
  54  *
  55  * TFTP:
  56  *
  57  *      Prerequisites:  - own ethernet address
  58  *                      - own IP address
  59  *                      - TFTP server IP address
  60  *                      - TFTP server ethernet address
  61  *                      - name of bootfile (if unknown, we use a default name
  62  *                        derived from our own IP address)
  63  *      We want:        - load the boot file
  64  *      Next step:      none
  65  *
  66  * NFS:
  67  *
  68  *      Prerequisites:  - own ethernet address
  69  *                      - own IP address
  70  *                      - name of bootfile (if unknown, we use a default name
  71  *                        derived from our own IP address)
  72  *      We want:        - load the boot file
  73  *      Next step:      none
  74  *
  75  * SNTP:
  76  *
  77  *      Prerequisites:  - own ethernet address
  78  *                      - own IP address
  79  *      We want:        - network time
  80  *      Next step:      none
  81  *
  82  * WOL:
  83  *
  84  *      Prerequisites:  - own ethernet address
  85  *      We want:        - magic packet or timeout
  86  *      Next step:      none
  87  */
  88
  89
  90 #include <common.h>
  91 #include <command.h>
  92 #include <console.h>
  93 #include <environment.h>
  94 #include <errno.h>
  95 #include <net.h>
  96 #include <net/fastboot.h>
  97 #include <net/tftp.h>
  98 #if defined(CONFIG_LED_STATUS)
  99 #include <miiphy.h>
 100 #include <status_led.h>
 101 #endif
 102 #include <watchdog.h>
 103 #include <linux/compiler.h>
 104 #include "arp.h"
 105 #include "bootp.h"
 106 #include "cdp.h"
 107 #if defined(CONFIG_CMD_DNS)
 108 #include "dns.h"
 109 #endif
 110 #include "link_local.h"
 111 #include "nfs.h"
 112 #include "ping.h"
 113 #include "rarp.h"
 114 #if defined(CONFIG_CMD_SNTP)
 115 #include "sntp.h"
 116 #endif
 117 #if defined(CONFIG_CMD_WOL)
 118 #include "wol.h"
 119 #endif
 120
 121 /** BOOTP EXTENTIONS **/
 122
 123 /* Our subnet mask (0=unknown) */
 124 struct in_addr net_netmask;
 125 /* Our gateways IP address */
 126 struct in_addr net_gateway;
 127 /* Our DNS IP address */
 128 struct in_addr net_dns_server;
 129 #if defined(CONFIG_BOOTP_DNS2)
 130 /* Our 2nd DNS IP address */
 131 struct in_addr net_dns_server2;
 132 #endif
 133
 134 /** END OF BOOTP EXTENTIONS **/
 135
 136 /* Our ethernet address */
 137 u8 net_ethaddr[6];
 138 /* Boot server enet address */
 139 u8 net_server_ethaddr[6];
 140 /* Our IP addr (0 = unknown) */
 141 struct in_addr  net_ip;
 142 /* Server IP addr (0 = unknown) */
 143 struct in_addr  net_server_ip;
 144 /* Current receive packet */
 145 uchar *net_rx_packet;
 146 /* Current rx packet length */
 147 int             net_rx_packet_len;
 148 /* IP packet ID */
 149 static unsigned net_ip_id;
 150 /* Ethernet bcast address */
 151 const u8 net_bcast_ethaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 152 const u8 net_null_ethaddr[6];
 153 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
 154 void (*push_packet)(void *, int len) = 0;
 155 #endif
 156 /* Network loop state */
 157 enum net_loop_state net_state;
 158 /* Tried all network devices */
 159 int             net_restart_wrap;
 160 /* Network loop restarted */
 161 static int      net_restarted;
 162 /* At least one device configured */
 163 static int      net_dev_exists;
 164
 165 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
 166 /* default is without VLAN */
 167 ushort          net_our_vlan = 0xFFFF;
 168 /* ditto */
 169 ushort          net_native_vlan = 0xFFFF;
 170
 171 /* Boot File name */
 172 char net_boot_file_name[1024];
 173 /* Indicates whether the file name was specified on the command line */
 174 bool net_boot_file_name_explicit;
 175 /* The actual transferred size of the bootfile (in bytes) */
 176 u32 net_boot_file_size;
 177 /* Boot file size in blocks as reported by the DHCP server */
 178 u32 net_boot_file_expected_size_in_blocks;
 179
 180 #if defined(CONFIG_CMD_SNTP)
 181 /* NTP server IP address */
 182 struct in_addr  net_ntp_server;
 183 /* offset time from UTC */
 184 int             net_ntp_time_offset;
 185 #endif
 186
 187 static uchar net_pkt_buf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 188 /* Receive packets */
 189 uchar *net_rx_packets[PKTBUFSRX];
 190 /* Current UDP RX packet handler */
 191 static rxhand_f *udp_packet_handler;
 192 /* Current ARP RX packet handler */
 193 static rxhand_f *arp_packet_handler;
 194 #ifdef CONFIG_CMD_TFTPPUT
 195 /* Current ICMP rx handler */
 196 static rxhand_icmp_f *packet_icmp_handler;
 197 #endif
 198 /* Current timeout handler */
 199 static thand_f *time_handler;
 200 /* Time base value */
 201 static ulong    time_start;
 202 /* Current timeout value */
 203 static ulong    time_delta;
 204 /* THE transmit packet */
 205 uchar *net_tx_packet;
 206
 207 static int net_check_prereq(enum proto_t protocol);
 208
 209 static int net_try_count;
 210
 211 int __maybe_unused net_busy_flag;
 212
 213 /**********************************************************************/
 214
 215 static int on_ipaddr(const char *name, const char *value, enum env_op op,
 216         int flags)
 217 {
 218         if (flags & H_PROGRAMMATIC)
 219                 return 0;
 220
 221         net_ip = string_to_ip(value);
 222
 223         return 0;
 224 }
 225 U_BOOT_ENV_CALLBACK(ipaddr, on_ipaddr);
 226
 227 static int on_gatewayip(const char *name, const char *value, enum env_op op,
 228         int flags)
 229 {
 230         if (flags & H_PROGRAMMATIC)
 231                 return 0;
 232
 233         net_gateway = string_to_ip(value);
 234
 235         return 0;
 236 }
 237 U_BOOT_ENV_CALLBACK(gatewayip, on_gatewayip);
 238
 239 static int on_netmask(const char *name, const char *value, enum env_op op,
 240         int flags)
 241 {
 242         if (flags & H_PROGRAMMATIC)
 243                 return 0;
 244
 245         net_netmask = string_to_ip(value);
 246
 247         return 0;
 248 }
 249 U_BOOT_ENV_CALLBACK(netmask, on_netmask);
 250
 251 static int on_serverip(const char *name, const char *value, enum env_op op,
 252         int flags)
 253 {
 254         if (flags & H_PROGRAMMATIC)
 255                 return 0;
 256
 257         net_server_ip = string_to_ip(value);
 258
 259         return 0;
 260 }
 261 U_BOOT_ENV_CALLBACK(serverip, on_serverip);
 262
 263 static int on_nvlan(const char *name, const char *value, enum env_op op,
 264         int flags)
 265 {
 266         if (flags & H_PROGRAMMATIC)
 267                 return 0;
 268
 269         net_native_vlan = string_to_vlan(value);
 270
 271         return 0;
 272 }
 273 U_BOOT_ENV_CALLBACK(nvlan, on_nvlan);
 274
 275 static int on_vlan(const char *name, const char *value, enum env_op op,
 276         int flags)
 277 {
 278         if (flags & H_PROGRAMMATIC)
 279                 return 0;
 280
 281         net_our_vlan = string_to_vlan(value);
 282
 283         return 0;
 284 }
 285 U_BOOT_ENV_CALLBACK(vlan, on_vlan);
 286
 287 #if defined(CONFIG_CMD_DNS)
 288 static int on_dnsip(const char *name, const char *value, enum env_op op,
 289         int flags)
 290 {
 291         if (flags & H_PROGRAMMATIC)
 292                 return 0;
 293
 294         net_dns_server = string_to_ip(value);
 295
 296         return 0;
 297 }
 298 U_BOOT_ENV_CALLBACK(dnsip, on_dnsip);
 299 #endif
 300
 301 /*
 302  * Check if autoload is enabled. If so, use either NFS or TFTP to download
 303  * the boot file.
 304  */
 305 void net_auto_load(void)
 306 {
 307 #if defined(CONFIG_CMD_NFS)
 308         const char *s = env_get("autoload");
 309
 310         if (s != NULL && strcmp(s, "NFS") == 0) {
 311                 if (net_check_prereq(NFS)) {
 312 /* We aren't expecting to get a serverip, so just accept the assigned IP */
 313 #ifdef CONFIG_BOOTP_SERVERIP
 314                         net_set_state(NETLOOP_SUCCESS);
 315 #else
 316                         printf("Cannot autoload with NFS\n");
 317                         net_set_state(NETLOOP_FAIL);
 318 #endif
 319                         return;
 320                 }
 321                 /*
 322                  * Use NFS to load the bootfile.
 323                  */
 324                 nfs_start();
 325                 return;
 326         }
 327 #endif
 328         if (env_get_yesno("autoload") == 0) {
 329                 /*
 330                  * Just use BOOTP/RARP to configure system;
 331                  * Do not use TFTP to load the bootfile.
 332                  */
 333                 net_set_state(NETLOOP_SUCCESS);
 334                 return;
 335         }
 336         if (net_check_prereq(TFTPGET)) {
 337 /* We aren't expecting to get a serverip, so just accept the assigned IP */
 338 #ifdef CONFIG_BOOTP_SERVERIP
 339                 net_set_state(NETLOOP_SUCCESS);
 340 #else
 341                 printf("Cannot autoload with TFTPGET\n");
 342                 net_set_state(NETLOOP_FAIL);
 343 #endif
 344                 return;
 345         }
 346         tftp_start(TFTPGET);
 347 }
 348
 349 static void net_init_loop(void)
 350 {
 351         if (eth_get_dev())
 352                 memcpy(net_ethaddr, eth_get_ethaddr(), 6);
 353
 354         return;
 355 }
 356
 357 static void net_clear_handlers(void)
 358 {
 359         net_set_udp_handler(NULL);
 360         net_set_arp_handler(NULL);
 361         net_set_timeout_handler(0, NULL);
 362 }
 363
 364 static void net_cleanup_loop(void)
 365 {
 366         net_clear_handlers();
 367 }
 368
 369 void net_init(void)
 370 {
 371         static int first_call = 1;
 372
 373         if (first_call) {
 374                 /*
 375                  *      Setup packet buffers, aligned correctly.
 376                  */
 377                 int i;
 378
 379                 net_tx_packet = &net_pkt_buf[0] + (PKTALIGN - 1);
 380                 net_tx_packet -= (ulong)net_tx_packet % PKTALIGN;
 381                 for (i = 0; i < PKTBUFSRX; i++) {
 382                         net_rx_packets[i] = net_tx_packet +
 383                                 (i + 1) * PKTSIZE_ALIGN;
 384                 }
 385                 arp_init();
 386                 net_clear_handlers();
 387
 388                 /* Only need to setup buffer pointers once. */
 389                 first_call = 0;
 390         }
 391
 392         net_init_loop();
 393 }
 394
 395 /**********************************************************************/
 396 /*
 397  *      Main network processing loop.
 398  */
 399
 400 int net_loop(enum proto_t protocol)
 401 {
 402         int ret = -EINVAL;
 403         enum net_loop_state prev_net_state = net_state;
 404
 405         net_restarted = 0;
 406         net_dev_exists = 0;
 407         net_try_count = 1;
 408         debug_cond(DEBUG_INT_STATE, "--- net_loop Entry\n");
 409
 410         bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
 411         net_init();
 412         if (eth_is_on_demand_init() || protocol != NETCONS) {
 413                 eth_halt();
 414                 eth_set_current();
 415                 ret = eth_init();
 416                 if (ret < 0) {
 417                         eth_halt();
 418                         return ret;
 419                 }
 420         } else {
 421                 eth_init_state_only();
 422         }
 423 restart:
 424 #ifdef CONFIG_USB_KEYBOARD
 425         net_busy_flag = 0;
 426 #endif
 427         net_set_state(NETLOOP_CONTINUE);
 428
 429         /*
 430          *      Start the ball rolling with the given start function.  From
 431          *      here on, this code is a state machine driven by received
 432          *      packets and timer events.
 433          */
 434         debug_cond(DEBUG_INT_STATE, "--- net_loop Init\n");
 435         net_init_loop();
 436
 437         switch (net_check_prereq(protocol)) {
 438         case 1:
 439                 /* network not configured */
 440                 eth_halt();
 441                 net_set_state(prev_net_state);
 442                 return -ENODEV;
 443
 444         case 2:
 445                 /* network device not configured */
 446                 break;
 447
 448         case 0:
 449                 net_dev_exists = 1;
 450                 net_boot_file_size = 0;
 451                 switch (protocol) {
 452                 case TFTPGET:
 453 #ifdef CONFIG_CMD_TFTPPUT
 454                 case TFTPPUT:
 455 #endif
 456                         /* always use ARP to get server ethernet address */
 457                         tftp_start(protocol);
 458                         break;
 459 #ifdef CONFIG_CMD_TFTPSRV
 460                 case TFTPSRV:
 461                         tftp_start_server();
 462                         break;
 463 #endif
 464 #ifdef CONFIG_UDP_FUNCTION_FASTBOOT
 465                 case FASTBOOT:
 466                         fastboot_start_server();
 467                         break;
 468 #endif
 469 #if defined(CONFIG_CMD_DHCP)
 470                 case DHCP:
 471                         bootp_reset();
 472                         net_ip.s_addr = 0;
 473                         dhcp_request();         /* Basically same as BOOTP */
 474                         break;
 475 #endif
 476
 477                 case BOOTP:
 478                         bootp_reset();
 479                         net_ip.s_addr = 0;
 480                         bootp_request();
 481                         break;
 482
 483 #if defined(CONFIG_CMD_RARP)
 484                 case RARP:
 485                         rarp_try = 0;
 486                         net_ip.s_addr = 0;
 487                         rarp_request();
 488                         break;
 489 #endif
 490 #if defined(CONFIG_CMD_PING)
 491                 case PING:
 492                         ping_start();
 493                         break;
 494 #endif
 495 #if defined(CONFIG_CMD_NFS)
 496                 case NFS:
 497                         nfs_start();
 498                         break;
 499 #endif
 500 #if defined(CONFIG_CMD_CDP)
 501                 case CDP:
 502                         cdp_start();
 503                         break;
 504 #endif
 505 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
 506                 case NETCONS:
 507                         nc_start();
 508                         break;
 509 #endif
 510 #if defined(CONFIG_CMD_SNTP)
 511                 case SNTP:
 512                         sntp_start();
 513                         break;
 514 #endif
 515 #if defined(CONFIG_CMD_DNS)
 516                 case DNS:
 517                         dns_start();
 518                         break;
 519 #endif
 520 #if defined(CONFIG_CMD_LINK_LOCAL)
 521                 case LINKLOCAL:
 522                         link_local_start();
 523                         break;
 524 #endif
 525 #if defined(CONFIG_CMD_WOL)
 526                 case WOL:
 527                         wol_start();
 528                         break;
 529 #endif
 530                 default:
 531                         break;
 532                 }
 533
 534                 break;
 535         }
 536
 537 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 538 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 539         defined(CONFIG_LED_STATUS)                      && \
 540         defined(CONFIG_LED_STATUS_RED)
 541         /*
 542          * Echo the inverted link state to the fault LED.
 543          */
 544         if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
 545                 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_OFF);
 546         else
 547                 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_ON);
 548 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 549 #endif /* CONFIG_MII, ... */
 550 #ifdef CONFIG_USB_KEYBOARD
 551         net_busy_flag = 1;
 552 #endif
 553
 554         /*
 555          *      Main packet reception loop.  Loop receiving packets until
 556          *      someone sets `net_state' to a state that terminates.
 557          */
 558         for (;;) {
 559                 WATCHDOG_RESET();
 560 #ifdef CONFIG_SHOW_ACTIVITY
 561                 show_activity(1);
 562 #endif
 563                 if (arp_timeout_check() > 0)
 564                         time_start = get_timer(0);
 565
 566                 /*
 567                  *      Check the ethernet for a new packet.  The ethernet
 568                  *      receive routine will process it.
 569                  *      Most drivers return the most recent packet size, but not
 570                  *      errors that may have happened.
 571                  */
 572                 eth_rx();
 573
 574                 /*
 575                  *      Abort if ctrl-c was pressed.
 576                  */
 577                 if (ctrlc()) {
 578                         /* cancel any ARP that may not have completed */
 579                         net_arp_wait_packet_ip.s_addr = 0;
 580
 581                         net_cleanup_loop();
 582                         eth_halt();
 583                         /* Invalidate the last protocol */
 584                         eth_set_last_protocol(BOOTP);
 585
 586                         puts("\nAbort\n");
 587                         /* include a debug print as well incase the debug
 588                            messages are directed to stderr */
 589                         debug_cond(DEBUG_INT_STATE, "--- net_loop Abort!\n");
 590                         ret = -EINTR;
 591                         goto done;
 592                 }
 593
 594                 /*
 595                  *      Check for a timeout, and run the timeout handler
 596                  *      if we have one.
 597                  */
 598                 if (time_handler &&
 599                     ((get_timer(0) - time_start) > time_delta)) {
 600                         thand_f *x;
 601
 602 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 603 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 604         defined(CONFIG_LED_STATUS)                      && \
 605         defined(CONFIG_LED_STATUS_RED)
 606                         /*
 607                          * Echo the inverted link state to the fault LED.
 608                          */
 609                         if (miiphy_link(eth_get_dev()->name,
 610                                         CONFIG_SYS_FAULT_MII_ADDR))
 611                                 status_led_set(CONFIG_LED_STATUS_RED,
 612                                                CONFIG_LED_STATUS_OFF);
 613                         else
 614                                 status_led_set(CONFIG_LED_STATUS_RED,
 615                                                CONFIG_LED_STATUS_ON);
 616 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 617 #endif /* CONFIG_MII, ... */
 618                         debug_cond(DEBUG_INT_STATE, "--- net_loop timeout\n");
 619                         x = time_handler;
 620                         time_handler = (thand_f *)0;
 621                         (*x)();
 622                 }
 623
 624                 if (net_state == NETLOOP_FAIL)
 625                         ret = net_start_again();
 626
 627                 switch (net_state) {
 628                 case NETLOOP_RESTART:
 629                         net_restarted = 1;
 630                         goto restart;
 631
 632                 case NETLOOP_SUCCESS:
 633                         net_cleanup_loop();
 634                         if (net_boot_file_size > 0) {
 635                                 printf("Bytes transferred = %d (%x hex)\n",
 636                                        net_boot_file_size, net_boot_file_size);
 637                                 env_set_hex("filesize", net_boot_file_size);
 638                                 env_set_hex("fileaddr", load_addr);
 639                         }
 640                         if (protocol != NETCONS)
 641                                 eth_halt();
 642                         else
 643                                 eth_halt_state_only();
 644
 645                         eth_set_last_protocol(protocol);
 646
 647                         ret = net_boot_file_size;
 648                         debug_cond(DEBUG_INT_STATE, "--- net_loop Success!\n");
 649                         goto done;
 650
 651                 case NETLOOP_FAIL:
 652                         net_cleanup_loop();
 653                         /* Invalidate the last protocol */
 654                         eth_set_last_protocol(BOOTP);
 655                         debug_cond(DEBUG_INT_STATE, "--- net_loop Fail!\n");
 656                         ret = -ENONET;
 657                         goto done;
 658
 659                 case NETLOOP_CONTINUE:
 660                         continue;
 661                 }
 662         }
 663
 664 done:
 665 #ifdef CONFIG_USB_KEYBOARD
 666         net_busy_flag = 0;
 667 #endif
 668 #ifdef CONFIG_CMD_TFTPPUT
 669         /* Clear out the handlers */
 670         net_set_udp_handler(NULL);
 671         net_set_icmp_handler(NULL);
 672 #endif
 673         net_set_state(prev_net_state);
 674         return ret;
 675 }
 676
 677 /**********************************************************************/
 678
 679 static void start_again_timeout_handler(void)
 680 {
 681         net_set_state(NETLOOP_RESTART);
 682 }
 683
 684 int net_start_again(void)
 685 {
 686         char *nretry;
 687         int retry_forever = 0;
 688         unsigned long retrycnt = 0;
 689         int ret;
 690
 691         nretry = env_get("netretry");
 692         if (nretry) {
 693                 if (!strcmp(nretry, "yes"))
 694                         retry_forever = 1;
 695                 else if (!strcmp(nretry, "no"))
 696                         retrycnt = 0;
 697                 else if (!strcmp(nretry, "once"))
 698                         retrycnt = 1;
 699                 else
 700                         retrycnt = simple_strtoul(nretry, NULL, 0);
 701         } else {
 702                 retrycnt = 0;
 703                 retry_forever = 0;
 704         }
 705
 706         if ((!retry_forever) && (net_try_count > retrycnt)) {
 707                 eth_halt();
 708                 net_set_state(NETLOOP_FAIL);
 709                 /*
 710                  * We don't provide a way for the protocol to return an error,
 711                  * but this is almost always the reason.
 712                  */
 713                 return -ETIMEDOUT;
 714         }
 715
 716         net_try_count++;
 717
 718         eth_halt();
 719 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
 720         eth_try_another(!net_restarted);
 721 #endif
 722         ret = eth_init();
 723         if (net_restart_wrap) {
 724                 net_restart_wrap = 0;
 725                 if (net_dev_exists) {
 726                         net_set_timeout_handler(10000UL,
 727                                                 start_again_timeout_handler);
 728                         net_set_udp_handler(NULL);
 729                 } else {
 730                         net_set_state(NETLOOP_FAIL);
 731                 }
 732         } else {
 733                 net_set_state(NETLOOP_RESTART);
 734         }
 735         return ret;
 736 }
 737
 738 /**********************************************************************/
 739 /*
 740  *      Miscelaneous bits.
 741  */
 742
 743 static void dummy_handler(uchar *pkt, unsigned dport,
 744                         struct in_addr sip, unsigned sport,
 745                         unsigned len)
 746 {
 747 }
 748
 749 rxhand_f *net_get_udp_handler(void)
 750 {
 751         return udp_packet_handler;
 752 }
 753
 754 void net_set_udp_handler(rxhand_f *f)
 755 {
 756         debug_cond(DEBUG_INT_STATE, "--- net_loop UDP handler set (%p)\n", f);
 757         if (f == NULL)
 758                 udp_packet_handler = dummy_handler;
 759         else
 760                 udp_packet_handler = f;
 761 }
 762
 763 rxhand_f *net_get_arp_handler(void)
 764 {
 765         return arp_packet_handler;
 766 }
 767
 768 void net_set_arp_handler(rxhand_f *f)
 769 {
 770         debug_cond(DEBUG_INT_STATE, "--- net_loop ARP handler set (%p)\n", f);
 771         if (f == NULL)
 772                 arp_packet_handler = dummy_handler;
 773         else
 774                 arp_packet_handler = f;
 775 }
 776
 777 #ifdef CONFIG_CMD_TFTPPUT
 778 void net_set_icmp_handler(rxhand_icmp_f *f)
 779 {
 780         packet_icmp_handler = f;
 781 }
 782 #endif
 783
 784 void net_set_timeout_handler(ulong iv, thand_f *f)
 785 {
 786         if (iv == 0) {
 787                 debug_cond(DEBUG_INT_STATE,
 788                            "--- net_loop timeout handler cancelled\n");
 789                 time_handler = (thand_f *)0;
 790         } else {
 791                 debug_cond(DEBUG_INT_STATE,
 792                            "--- net_loop timeout handler set (%p)\n", f);
 793                 time_handler = f;
 794                 time_start = get_timer(0);
 795                 time_delta = iv * CONFIG_SYS_HZ / 1000;
 796         }
 797 }
 798
 799 uchar *net_get_async_tx_pkt_buf(void)
 800 {
 801         if (arp_is_waiting())
 802                 return arp_tx_packet; /* If we are waiting, we already sent */
 803         else
 804                 return net_tx_packet;
 805 }
 806
 807 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
 808                 int payload_len)
 809 {
 810         return net_send_ip_packet(ether, dest, dport, sport, payload_len,
 811                                   IPPROTO_UDP, 0, 0, 0);
 812 }
 813
 814 int net_send_ip_packet(uchar *ether, struct in_addr dest, int dport, int sport,
 815                        int payload_len, int proto, u8 action, u32 tcp_seq_num,
 816                        u32 tcp_ack_num)
 817 {
 818         uchar *pkt;
 819         int eth_hdr_size;
 820         int pkt_hdr_size;
 821
 822         /* make sure the net_tx_packet is initialized (net_init() was called) */
 823         assert(net_tx_packet != NULL);
 824         if (net_tx_packet == NULL)
 825                 return -1;
 826
 827         /* convert to new style broadcast */
 828         if (dest.s_addr == 0)
 829                 dest.s_addr = 0xFFFFFFFF;
 830
 831         /* if broadcast, make the ether address a broadcast and don't do ARP */
 832         if (dest.s_addr == 0xFFFFFFFF)
 833                 ether = (uchar *)net_bcast_ethaddr;
 834
 835         pkt = (uchar *)net_tx_packet;
 836
 837         eth_hdr_size = net_set_ether(pkt, ether, PROT_IP);
 838
 839         switch (proto) {
 840         case IPPROTO_UDP:
 841                 net_set_udp_header(pkt + eth_hdr_size, dest, dport, sport,
 842                                    payload_len);
 843                 pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
 844                 break;
 845         default:
 846                 return -EINVAL;
 847         }
 848
 849         /* if MAC address was not discovered yet, do an ARP request */
 850         if (memcmp(ether, net_null_ethaddr, 6) == 0) {
 851                 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest);
 852
 853                 /* save the ip and eth addr for the packet to send after arp */
 854                 net_arp_wait_packet_ip = dest;
 855                 arp_wait_packet_ethaddr = ether;
 856
 857                 /* size of the waiting packet */
 858                 arp_wait_tx_packet_size = pkt_hdr_size + payload_len;
 859
 860                 /* and do the ARP request */
 861                 arp_wait_try = 1;
 862                 arp_wait_timer_start = get_timer(0);
 863                 arp_request();
 864                 return 1;       /* waiting */
 865         } else {
 866                 debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
 867                            &dest, ether);
 868                 net_send_packet(net_tx_packet, pkt_hdr_size + payload_len);
 869                 return 0;       /* transmitted */
 870         }
 871 }
 872
 873 #ifdef CONFIG_IP_DEFRAG
 874 /*
 875  * This function collects fragments in a single packet, according
 876  * to the algorithm in RFC815. It returns NULL or the pointer to
 877  * a complete packet, in static storage
 878  */
 879 #ifndef CONFIG_NET_MAXDEFRAG
 880 #define CONFIG_NET_MAXDEFRAG 16384
 881 #endif
 882 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG)
 883
 884 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE)
 885
 886 /*
 887  * this is the packet being assembled, either data or frag control.
 888  * Fragments go by 8 bytes, so this union must be 8 bytes long
 889  */
 890 struct hole {
 891         /* first_byte is address of this structure */
 892         u16 last_byte;  /* last byte in this hole + 1 (begin of next hole) */
 893         u16 next_hole;  /* index of next (in 8-b blocks), 0 == none */
 894         u16 prev_hole;  /* index of prev, 0 == none */
 895         u16 unused;
 896 };
 897
 898 static struct ip_udp_hdr *__net_defragment(struct ip_udp_hdr *ip, int *lenp)
 899 {
 900         static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
 901         static u16 first_hole, total_len;
 902         struct hole *payload, *thisfrag, *h, *newh;
 903         struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff;
 904         uchar *indata = (uchar *)ip;
 905         int offset8, start, len, done = 0;
 906         u16 ip_off = ntohs(ip->ip_off);
 907
 908         /* payload starts after IP header, this fragment is in there */
 909         payload = (struct hole *)(pkt_buff + IP_HDR_SIZE);
 910         offset8 =  (ip_off & IP_OFFS);
 911         thisfrag = payload + offset8;
 912         start = offset8 * 8;
 913         len = ntohs(ip->ip_len) - IP_HDR_SIZE;
 914
 915         if (start + len > IP_MAXUDP) /* fragment extends too far */
 916                 return NULL;
 917
 918         if (!total_len || localip->ip_id != ip->ip_id) {
 919                 /* new (or different) packet, reset structs */
 920                 total_len = 0xffff;
 921                 payload[0].last_byte = ~0;
 922                 payload[0].next_hole = 0;
 923                 payload[0].prev_hole = 0;
 924                 first_hole = 0;
 925                 /* any IP header will work, copy the first we received */
 926                 memcpy(localip, ip, IP_HDR_SIZE);
 927         }
 928
 929         /*
 930          * What follows is the reassembly algorithm. We use the payload
 931          * array as a linked list of hole descriptors, as each hole starts
 932          * at a multiple of 8 bytes. However, last byte can be whatever value,
 933          * so it is represented as byte count, not as 8-byte blocks.
 934          */
 935
 936         h = payload + first_hole;
 937         while (h->last_byte < start) {
 938                 if (!h->next_hole) {
 939                         /* no hole that far away */
 940                         return NULL;
 941                 }
 942                 h = payload + h->next_hole;
 943         }
 944
 945         /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
 946         if (offset8 + ((len + 7) / 8) <= h - payload) {
 947                 /* no overlap with holes (dup fragment?) */
 948                 return NULL;
 949         }
 950
 951         if (!(ip_off & IP_FLAGS_MFRAG)) {
 952                 /* no more fragmentss: truncate this (last) hole */
 953                 total_len = start + len;
 954                 h->last_byte = start + len;
 955         }
 956
 957         /*
 958          * There is some overlap: fix the hole list. This code doesn't
 959          * deal with a fragment that overlaps with two different holes
 960          * (thus being a superset of a previously-received fragment).
 961          */
 962
 963         if ((h >= thisfrag) && (h->last_byte <= start + len)) {
 964                 /* complete overlap with hole: remove hole */
 965                 if (!h->prev_hole && !h->next_hole) {
 966                         /* last remaining hole */
 967                         done = 1;
 968                 } else if (!h->prev_hole) {
 969                         /* first hole */
 970                         first_hole = h->next_hole;
 971                         payload[h->next_hole].prev_hole = 0;
 972                 } else if (!h->next_hole) {
 973                         /* last hole */
 974                         payload[h->prev_hole].next_hole = 0;
 975                 } else {
 976                         /* in the middle of the list */
 977                         payload[h->next_hole].prev_hole = h->prev_hole;
 978                         payload[h->prev_hole].next_hole = h->next_hole;
 979                 }
 980
 981         } else if (h->last_byte <= start + len) {
 982                 /* overlaps with final part of the hole: shorten this hole */
 983                 h->last_byte = start;
 984
 985         } else if (h >= thisfrag) {
 986                 /* overlaps with initial part of the hole: move this hole */
 987                 newh = thisfrag + (len / 8);
 988                 *newh = *h;
 989                 h = newh;
 990                 if (h->next_hole)
 991                         payload[h->next_hole].prev_hole = (h - payload);
 992                 if (h->prev_hole)
 993                         payload[h->prev_hole].next_hole = (h - payload);
 994                 else
 995                         first_hole = (h - payload);
 996
 997         } else {
 998                 /* fragment sits in the middle: split the hole */
 999                 newh = thisfrag + (len / 8);
1000                 *newh = *h;
1001                 h->last_byte = start;
1002                 h->next_hole = (newh - payload);
1003                 newh->prev_hole = (h - payload);
1004                 if (newh->next_hole)
1005                         payload[newh->next_hole].prev_hole = (newh - payload);
1006         }
1007
1008         /* finally copy this fragment and possibly return whole packet */
1009         memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len);
1010         if (!done)
1011                 return NULL;
1012
1013         localip->ip_len = htons(total_len);
1014         *lenp = total_len + IP_HDR_SIZE;
1015         return localip;
1016 }
1017
1018 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
1019         int *lenp)
1020 {
1021         u16 ip_off = ntohs(ip->ip_off);
1022         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1023                 return ip; /* not a fragment */
1024         return __net_defragment(ip, lenp);
1025 }
1026
1027 #else /* !CONFIG_IP_DEFRAG */
1028
1029 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
1030         int *lenp)
1031 {
1032         u16 ip_off = ntohs(ip->ip_off);
1033         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1034                 return ip; /* not a fragment */
1035         return NULL;
1036 }
1037 #endif
1038
1039 /**
1040  * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
1041  * drop others.
1042  *
1043  * @parma ip    IP packet containing the ICMP
1044  */
1045 static void receive_icmp(struct ip_udp_hdr *ip, int len,
1046                         struct in_addr src_ip, struct ethernet_hdr *et)
1047 {
1048         struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
1049
1050         switch (icmph->type) {
1051         case ICMP_REDIRECT:
1052                 if (icmph->code != ICMP_REDIR_HOST)
1053                         return;
1054                 printf(" ICMP Host Redirect to %pI4 ",
1055                        &icmph->un.gateway);
1056                 break;
1057         default:
1058 #if defined(CONFIG_CMD_PING)
1059                 ping_receive(et, ip, len);
1060 #endif
1061 #ifdef CONFIG_CMD_TFTPPUT
1062                 if (packet_icmp_handler)
1063                         packet_icmp_handler(icmph->type, icmph->code,
1064                                             ntohs(ip->udp_dst), src_ip,
1065                                             ntohs(ip->udp_src), icmph->un.data,
1066                                             ntohs(ip->udp_len));
1067 #endif
1068                 break;
1069         }
1070 }
1071
1072 void net_process_received_packet(uchar *in_packet, int len)
1073 {
1074         struct ethernet_hdr *et;
1075         struct ip_udp_hdr *ip;
1076         struct in_addr dst_ip;
1077         struct in_addr src_ip;
1078         int eth_proto;
1079 #if defined(CONFIG_CMD_CDP)
1080         int iscdp;
1081 #endif
1082         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1083
1084         debug_cond(DEBUG_NET_PKT, "packet received\n");
1085
1086         net_rx_packet = in_packet;
1087         net_rx_packet_len = len;
1088         et = (struct ethernet_hdr *)in_packet;
1089
1090         /* too small packet? */
1091         if (len < ETHER_HDR_SIZE)
1092                 return;
1093
1094 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
1095         if (push_packet) {
1096                 (*push_packet)(in_packet, len);
1097                 return;
1098         }
1099 #endif
1100
1101 #if defined(CONFIG_CMD_CDP)
1102         /* keep track if packet is CDP */
1103         iscdp = is_cdp_packet(et->et_dest);
1104 #endif
1105
1106         myvlanid = ntohs(net_our_vlan);
1107         if (myvlanid == (ushort)-1)
1108                 myvlanid = VLAN_NONE;
1109         mynvlanid = ntohs(net_native_vlan);
1110         if (mynvlanid == (ushort)-1)
1111                 mynvlanid = VLAN_NONE;
1112
1113         eth_proto = ntohs(et->et_protlen);
1114
1115         if (eth_proto < 1514) {
1116                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1117                 /*
1118                  *      Got a 802.2 packet.  Check the other protocol field.
1119                  *      XXX VLAN over 802.2+SNAP not implemented!
1120                  */
1121                 eth_proto = ntohs(et802->et_prot);
1122
1123                 ip = (struct ip_udp_hdr *)(in_packet + E802_HDR_SIZE);
1124                 len -= E802_HDR_SIZE;
1125
1126         } else if (eth_proto != PROT_VLAN) {    /* normal packet */
1127                 ip = (struct ip_udp_hdr *)(in_packet + ETHER_HDR_SIZE);
1128                 len -= ETHER_HDR_SIZE;
1129
1130         } else {                        /* VLAN packet */
1131                 struct vlan_ethernet_hdr *vet =
1132                         (struct vlan_ethernet_hdr *)et;
1133
1134                 debug_cond(DEBUG_NET_PKT, "VLAN packet received\n");
1135
1136                 /* too small packet? */
1137                 if (len < VLAN_ETHER_HDR_SIZE)
1138                         return;
1139
1140                 /* if no VLAN active */
1141                 if ((ntohs(net_our_vlan) & VLAN_IDMASK) == VLAN_NONE
1142 #if defined(CONFIG_CMD_CDP)
1143                                 && iscdp == 0
1144 #endif
1145                                 )
1146                         return;
1147
1148                 cti = ntohs(vet->vet_tag);
1149                 vlanid = cti & VLAN_IDMASK;
1150                 eth_proto = ntohs(vet->vet_type);
1151
1152                 ip = (struct ip_udp_hdr *)(in_packet + VLAN_ETHER_HDR_SIZE);
1153                 len -= VLAN_ETHER_HDR_SIZE;
1154         }
1155
1156         debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto);
1157
1158 #if defined(CONFIG_CMD_CDP)
1159         if (iscdp) {
1160                 cdp_receive((uchar *)ip, len);
1161                 return;
1162         }
1163 #endif
1164
1165         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1166                 if (vlanid == VLAN_NONE)
1167                         vlanid = (mynvlanid & VLAN_IDMASK);
1168                 /* not matched? */
1169                 if (vlanid != (myvlanid & VLAN_IDMASK))
1170                         return;
1171         }
1172
1173         switch (eth_proto) {
1174         case PROT_ARP:
1175                 arp_receive(et, ip, len);
1176                 break;
1177
1178 #ifdef CONFIG_CMD_RARP
1179         case PROT_RARP:
1180                 rarp_receive(ip, len);
1181                 break;
1182 #endif
1183         case PROT_IP:
1184                 debug_cond(DEBUG_NET_PKT, "Got IP\n");
1185                 /* Before we start poking the header, make sure it is there */
1186                 if (len < IP_UDP_HDR_SIZE) {
1187                         debug("len bad %d < %lu\n", len,
1188                               (ulong)IP_UDP_HDR_SIZE);
1189                         return;
1190                 }
1191                 /* Check the packet length */
1192                 if (len < ntohs(ip->ip_len)) {
1193                         debug("len bad %d < %d\n", len, ntohs(ip->ip_len));
1194                         return;
1195                 }
1196                 len = ntohs(ip->ip_len);
1197                 debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n",
1198                            len, ip->ip_hl_v & 0xff);
1199
1200                 /* Can't deal with anything except IPv4 */
1201                 if ((ip->ip_hl_v & 0xf0) != 0x40)
1202                         return;
1203                 /* Can't deal with IP options (headers != 20 bytes) */
1204                 if ((ip->ip_hl_v & 0x0f) > 0x05)
1205                         return;
1206                 /* Check the Checksum of the header */
1207                 if (!ip_checksum_ok((uchar *)ip, IP_HDR_SIZE)) {
1208                         debug("checksum bad\n");
1209                         return;
1210                 }
1211                 /* If it is not for us, ignore it */
1212                 dst_ip = net_read_ip(&ip->ip_dst);
1213                 if (net_ip.s_addr && dst_ip.s_addr != net_ip.s_addr &&
1214                     dst_ip.s_addr != 0xFFFFFFFF) {
1215                                 return;
1216                 }
1217                 /* Read source IP address for later use */
1218                 src_ip = net_read_ip(&ip->ip_src);
1219                 /*
1220                  * The function returns the unchanged packet if it's not
1221                  * a fragment, and either the complete packet or NULL if
1222                  * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1223                  */
1224                 ip = net_defragment(ip, &len);
1225                 if (!ip)
1226                         return;
1227                 /*
1228                  * watch for ICMP host redirects
1229                  *
1230                  * There is no real handler code (yet). We just watch
1231                  * for ICMP host redirect messages. In case anybody
1232                  * sees these messages: please contact me
1233                  * (wd@denx.de), or - even better - send me the
1234                  * necessary fixes :-)
1235                  *
1236                  * Note: in all cases where I have seen this so far
1237                  * it was a problem with the router configuration,
1238                  * for instance when a router was configured in the
1239                  * BOOTP reply, but the TFTP server was on the same
1240                  * subnet. So this is probably a warning that your
1241                  * configuration might be wrong. But I'm not really
1242                  * sure if there aren't any other situations.
1243                  *
1244                  * Simon Glass <sjg@chromium.org>: We get an ICMP when
1245                  * we send a tftp packet to a dead connection, or when
1246                  * there is no server at the other end.
1247                  */
1248                 if (ip->ip_p == IPPROTO_ICMP) {
1249                         receive_icmp(ip, len, src_ip, et);
1250                         return;
1251                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1252                         return;
1253                 }
1254
1255                 debug_cond(DEBUG_DEV_PKT,
1256                            "received UDP (to=%pI4, from=%pI4, len=%d)\n",
1257                            &dst_ip, &src_ip, len);
1258
1259 #ifdef CONFIG_UDP_CHECKSUM
1260                 if (ip->udp_xsum != 0) {
1261                         ulong   xsum;
1262                         ushort *sumptr;
1263                         ushort  sumlen;
1264
1265                         xsum  = ip->ip_p;
1266                         xsum += (ntohs(ip->udp_len));
1267                         xsum += (ntohl(ip->ip_src.s_addr) >> 16) & 0x0000ffff;
1268                         xsum += (ntohl(ip->ip_src.s_addr) >>  0) & 0x0000ffff;
1269                         xsum += (ntohl(ip->ip_dst.s_addr) >> 16) & 0x0000ffff;
1270                         xsum += (ntohl(ip->ip_dst.s_addr) >>  0) & 0x0000ffff;
1271
1272                         sumlen = ntohs(ip->udp_len);
1273                         sumptr = (ushort *)&(ip->udp_src);
1274
1275                         while (sumlen > 1) {
1276                                 ushort sumdata;
1277
1278                                 sumdata = *sumptr++;
1279                                 xsum += ntohs(sumdata);
1280                                 sumlen -= 2;
1281                         }
1282                         if (sumlen > 0) {
1283                                 ushort sumdata;
1284
1285                                 sumdata = *(unsigned char *)sumptr;
1286                                 sumdata = (sumdata << 8) & 0xff00;
1287                                 xsum += sumdata;
1288                         }
1289                         while ((xsum >> 16) != 0) {
1290                                 xsum = (xsum & 0x0000ffff) +
1291                                        ((xsum >> 16) & 0x0000ffff);
1292                         }
1293                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1294                                 printf(" UDP wrong checksum %08lx %08x\n",
1295                                        xsum, ntohs(ip->udp_xsum));
1296                                 return;
1297                         }
1298                 }
1299 #endif
1300
1301 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
1302                 nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
1303                                 src_ip,
1304                                 ntohs(ip->udp_dst),
1305                                 ntohs(ip->udp_src),
1306                                 ntohs(ip->udp_len) - UDP_HDR_SIZE);
1307 #endif
1308                 /*
1309                  * IP header OK.  Pass the packet to the current handler.
1310                  */
1311                 (*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE,
1312                                       ntohs(ip->udp_dst),
1313                                       src_ip,
1314                                       ntohs(ip->udp_src),
1315                                       ntohs(ip->udp_len) - UDP_HDR_SIZE);
1316                 break;
1317 #ifdef CONFIG_CMD_WOL
1318         case PROT_WOL:
1319                 wol_receive(ip, len);
1320                 break;
1321 #endif
1322         }
1323 }
1324
1325 /**********************************************************************/
1326
1327 static int net_check_prereq(enum proto_t protocol)
1328 {
1329         switch (protocol) {
1330                 /* Fall through */
1331 #if defined(CONFIG_CMD_PING)
1332         case PING:
1333                 if (net_ping_ip.s_addr == 0) {
1334                         puts("*** ERROR: ping address not given\n");
1335                         return 1;
1336                 }
1337                 goto common;
1338 #endif
1339 #if defined(CONFIG_CMD_SNTP)
1340         case SNTP:
1341                 if (net_ntp_server.s_addr == 0) {
1342                         puts("*** ERROR: NTP server address not given\n");
1343                         return 1;
1344                 }
1345                 goto common;
1346 #endif
1347 #if defined(CONFIG_CMD_DNS)
1348         case DNS:
1349                 if (net_dns_server.s_addr == 0) {
1350                         puts("*** ERROR: DNS server address not given\n");
1351                         return 1;
1352                 }
1353                 goto common;
1354 #endif
1355 #if defined(CONFIG_CMD_NFS)
1356         case NFS:
1357 #endif
1358                 /* Fall through */
1359         case TFTPGET:
1360         case TFTPPUT:
1361                 if (net_server_ip.s_addr == 0 && !is_serverip_in_cmd()) {
1362                         puts("*** ERROR: `serverip' not set\n");
1363                         return 1;
1364                 }
1365 #if     defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
1366         defined(CONFIG_CMD_DNS)
1367 common:
1368 #endif
1369                 /* Fall through */
1370
1371         case NETCONS:
1372         case FASTBOOT:
1373         case TFTPSRV:
1374                 if (net_ip.s_addr == 0) {
1375                         puts("*** ERROR: `ipaddr' not set\n");
1376                         return 1;
1377                 }
1378                 /* Fall through */
1379
1380 #ifdef CONFIG_CMD_RARP
1381         case RARP:
1382 #endif
1383         case BOOTP:
1384         case CDP:
1385         case DHCP:
1386         case LINKLOCAL:
1387                 if (memcmp(net_ethaddr, "\0\0\0\0\0\0", 6) == 0) {
1388                         int num = eth_get_dev_index();
1389
1390                         switch (num) {
1391                         case -1:
1392                                 puts("*** ERROR: No ethernet found.\n");
1393                                 return 1;
1394                         case 0:
1395                                 puts("*** ERROR: `ethaddr' not set\n");
1396                                 break;
1397                         default:
1398                                 printf("*** ERROR: `eth%daddr' not set\n",
1399                                        num);
1400                                 break;
1401                         }
1402
1403                         net_start_again();
1404                         return 2;
1405                 }
1406                 /* Fall through */
1407         default:
1408                 return 0;
1409         }
1410         return 0;               /* OK */
1411 }
1412 /**********************************************************************/
1413
1414 int
1415 net_eth_hdr_size(void)
1416 {
1417         ushort myvlanid;
1418
1419         myvlanid = ntohs(net_our_vlan);
1420         if (myvlanid == (ushort)-1)
1421                 myvlanid = VLAN_NONE;
1422
1423         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1424                 VLAN_ETHER_HDR_SIZE;
1425 }
1426
1427 int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot)
1428 {
1429         struct ethernet_hdr *et = (struct ethernet_hdr *)xet;
1430         ushort myvlanid;
1431
1432         myvlanid = ntohs(net_our_vlan);
1433         if (myvlanid == (ushort)-1)
1434                 myvlanid = VLAN_NONE;
1435
1436         memcpy(et->et_dest, dest_ethaddr, 6);
1437         memcpy(et->et_src, net_ethaddr, 6);
1438         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1439                 et->et_protlen = htons(prot);
1440                 return ETHER_HDR_SIZE;
1441         } else {
1442                 struct vlan_ethernet_hdr *vet =
1443                         (struct vlan_ethernet_hdr *)xet;
1444
1445                 vet->vet_vlan_type = htons(PROT_VLAN);
1446                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1447                 vet->vet_type = htons(prot);
1448                 return VLAN_ETHER_HDR_SIZE;
1449         }
1450 }
1451
1452 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
1453 {
1454         ushort protlen;
1455
1456         memcpy(et->et_dest, addr, 6);
1457         memcpy(et->et_src, net_ethaddr, 6);
1458         protlen = ntohs(et->et_protlen);
1459         if (protlen == PROT_VLAN) {
1460                 struct vlan_ethernet_hdr *vet =
1461                         (struct vlan_ethernet_hdr *)et;
1462                 vet->vet_type = htons(prot);
1463                 return VLAN_ETHER_HDR_SIZE;
1464         } else if (protlen > 1514) {
1465                 et->et_protlen = htons(prot);
1466                 return ETHER_HDR_SIZE;
1467         } else {
1468                 /* 802.2 + SNAP */
1469                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1470                 et802->et_prot = htons(prot);
1471                 return E802_HDR_SIZE;
1472         }
1473 }
1474
1475 void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source,
1476                        u16 pkt_len, u8 proto)
1477 {
1478         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1479
1480         /*
1481          *      Construct an IP header.
1482          */
1483         /* IP_HDR_SIZE / 4 (not including UDP) */
1484         ip->ip_hl_v  = 0x45;
1485         ip->ip_tos   = 0;
1486         ip->ip_len   = htons(pkt_len);
1487         ip->ip_p     = proto;
1488         ip->ip_id    = htons(net_ip_id++);
1489         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1490         ip->ip_ttl   = 255;
1491         ip->ip_sum   = 0;
1492         /* already in network byte order */
1493         net_copy_ip((void *)&ip->ip_src, &source);
1494         /* already in network byte order */
1495         net_copy_ip((void *)&ip->ip_dst, &dest);
1496
1497         ip->ip_sum   = compute_ip_checksum(ip, IP_HDR_SIZE);
1498 }
1499
1500 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport,
1501                         int len)
1502 {
1503         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1504
1505         /*
1506          *      If the data is an odd number of bytes, zero the
1507          *      byte after the last byte so that the checksum
1508          *      will work.
1509          */
1510         if (len & 1)
1511                 pkt[IP_UDP_HDR_SIZE + len] = 0;
1512
1513         net_set_ip_header(pkt, dest, net_ip, IP_UDP_HDR_SIZE + len,
1514                           IPPROTO_UDP);
1515
1516         ip->udp_src  = htons(sport);
1517         ip->udp_dst  = htons(dport);
1518         ip->udp_len  = htons(UDP_HDR_SIZE + len);
1519         ip->udp_xsum = 0;
1520 }
1521
1522 void copy_filename(char *dst, const char *src, int size)
1523 {
1524         if (src && *src && (*src == '"')) {
1525                 ++src;
1526                 --size;
1527         }
1528
1529         while ((--size > 0) && src && *src && (*src != '"'))
1530                 *dst++ = *src++;
1531         *dst = '\0';
1532 }
1533
1534 int is_serverip_in_cmd(void)
1535 {
1536         return !!strchr(net_boot_file_name, ':');
1537 }
1538
1539 int net_parse_bootfile(struct in_addr *ipaddr, char *filename, int max_len)
1540 {
1541         char *colon;
1542
1543         if (net_boot_file_name[0] == '\0')
1544                 return 0;
1545
1546         colon = strchr(net_boot_file_name, ':');
1547         if (colon) {
1548                 if (ipaddr)
1549                         *ipaddr = string_to_ip(net_boot_file_name);
1550                 strncpy(filename, colon + 1, max_len);
1551         } else {
1552                 strncpy(filename, net_boot_file_name, max_len);
1553         }
1554         filename[max_len - 1] = '\0';
1555
1556         return 1;
1557 }
1558
1559 #if     defined(CONFIG_CMD_NFS)         || \
1560         defined(CONFIG_CMD_SNTP)        || \
1561         defined(CONFIG_CMD_DNS)
1562 /*
1563  * make port a little random (1024-17407)
1564  * This keeps the math somewhat trivial to compute, and seems to work with
1565  * all supported protocols/clients/servers
1566  */
1567 unsigned int random_port(void)
1568 {
1569         return 1024 + (get_timer(0) % 0x4000);
1570 }
1571 #endif
1572
1573 void ip_to_string(struct in_addr x, char *s)
1574 {
1575         x.s_addr = ntohl(x.s_addr);
1576         sprintf(s, "%d.%d.%d.%d",
1577                 (int) ((x.s_addr >> 24) & 0xff),
1578                 (int) ((x.s_addr >> 16) & 0xff),
1579                 (int) ((x.s_addr >> 8) & 0xff),
1580                 (int) ((x.s_addr >> 0) & 0xff)
1581         );
1582 }
1583
1584 void vlan_to_string(ushort x, char *s)
1585 {
1586         x = ntohs(x);
1587
1588         if (x == (ushort)-1)
1589                 x = VLAN_NONE;
1590
1591         if (x == VLAN_NONE)
1592                 strcpy(s, "none");
1593         else
1594                 sprintf(s, "%d", x & VLAN_IDMASK);
1595 }
1596
1597 ushort string_to_vlan(const char *s)
1598 {
1599         ushort id;
1600
1601         if (s == NULL)
1602                 return htons(VLAN_NONE);
1603
1604         if (*s < '0' || *s > '9')
1605                 id = VLAN_NONE;
1606         else
1607                 id = (ushort)simple_strtoul(s, NULL, 10);
1608
1609         return htons(id);
1610 }
1611
1612 ushort env_get_vlan(char *var)
1613 {
1614         return string_to_vlan(env_get(var));
1615 }