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