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, [email protected]
  10  */
  11
  12 /*
  13  * General Desription:
  14  *
  15  * The user interface supports commands for BOOTP, RARP, and TFTP.
  16  * Also, we support ARP internally. Depending on available data,
  17  * these interact as follows:
  18  *
  19  * BOOTP:
  20  *
  21  *      Prerequisites:  - own ethernet address
  22  *      We want:        - own IP address
  23  *                      - TFTP server IP address
  24  *                      - name of bootfile
  25  *      Next step:      ARP
  26  *
  27  * LINK_LOCAL:
  28  *
  29  *      Prerequisites:  - own ethernet address
  30  *      We want:        - own IP address
  31  *      Next step:      ARP
  32  *
  33  * RARP:
  34  *
  35  *      Prerequisites:  - own ethernet address
  36  *      We want:        - own IP address
  37  *                      - TFTP server IP address
  38  *      Next step:      ARP
  39  *
  40  * ARP:
  41  *
  42  *      Prerequisites:  - own ethernet address
  43  *                      - own IP address
  44  *                      - TFTP server IP address
  45  *      We want:        - TFTP server ethernet address
  46  *      Next step:      TFTP
  47  *
  48  * DHCP:
  49  *
  50  *     Prerequisites:   - own ethernet address
  51  *     We want:         - IP, Netmask, ServerIP, Gateway IP
  52  *                      - bootfilename, lease time
  53  *     Next step:       - TFTP
  54  *
  55  * TFTP:
  56  *
  57  *      Prerequisites:  - own ethernet address
  58  *                      - own IP address
  59  *                      - TFTP server IP address
  60  *                      - TFTP server ethernet address
  61  *                      - name of bootfile (if unknown, we use a default name
  62  *                        derived from our own IP address)
  63  *      We want:        - load the boot file
  64  *      Next step:      none
  65  *
  66  * NFS:
  67  *
  68  *      Prerequisites:  - own ethernet address
  69  *                      - own IP address
  70  *                      - name of bootfile (if unknown, we use a default name
  71  *                        derived from our own IP address)
  72  *      We want:        - load the boot file
  73  *      Next step:      none
  74  *
  75  *
  76  * WOL:
  77  *
  78  *      Prerequisites:  - own ethernet address
  79  *      We want:        - magic packet or timeout
  80  *      Next step:      none
  81  */
  82
  83
  84 #include <common.h>
  85 #include <bootstage.h>
  86 #include <command.h>
  87 #include <console.h>
  88 #include <env.h>
  89 #include <env_internal.h>
  90 #include <errno.h>
  91 #include <image.h>
  92 #include <log.h>
  93 #include <net.h>
  94 #include <net6.h>
  95 #include <ndisc.h>
  96 #include <net/fastboot.h>
  97 #include <net/tftp.h>
  98 #include <net/ncsi.h>
  99 #if defined(CONFIG_CMD_PCAP)
 100 #include <net/pcap.h>
 101 #endif
 102 #include <net/udp.h>
 103 #if defined(CONFIG_LED_STATUS)
 104 #include <miiphy.h>
 105 #include <status_led.h>
 106 #endif
 107 #include <watchdog.h>
 108 #include <linux/compiler.h>
 109 #include "arp.h"
 110 #include "bootp.h"
 111 #include "cdp.h"
 112 #if defined(CONFIG_CMD_DNS)
 113 #include "dns.h"
 114 #endif
 115 #include "link_local.h"
 116 #include "nfs.h"
 117 #include "ping.h"
 118 #include "rarp.h"
 119 #if defined(CONFIG_CMD_WOL)
 120 #include "wol.h"
 121 #endif
 122 #include <net/tcp.h>
 123 #include <net/wget.h>
 124
 125 /** BOOTP EXTENTIONS **/
 126
 127 /* Our subnet mask (0=unknown) */
 128 struct in_addr net_netmask;
 129 /* Our gateways IP address */
 130 struct in_addr net_gateway;
 131 /* Our DNS IP address */
 132 struct in_addr net_dns_server;
 133 #if defined(CONFIG_BOOTP_DNS2)
 134 /* Our 2nd DNS IP address */
 135 struct in_addr net_dns_server2;
 136 #endif
 137
 138 /** END OF BOOTP EXTENTIONS **/
 139
 140 /* Our ethernet address */
 141 u8 net_ethaddr[6];
 142 /* Boot server enet address */
 143 u8 net_server_ethaddr[6];
 144 /* Our IP addr (0 = unknown) */
 145 struct in_addr  net_ip;
 146 /* Server IP addr (0 = unknown) */
 147 struct in_addr  net_server_ip;
 148 /* Current receive packet */
 149 uchar *net_rx_packet;
 150 /* Current rx packet length */
 151 int             net_rx_packet_len;
 152 /* IP packet ID */
 153 static unsigned net_ip_id;
 154 /* Ethernet bcast address */
 155 const u8 net_bcast_ethaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 156 const u8 net_null_ethaddr[6];
 157 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
 158 void (*push_packet)(void *, int len) = 0;
 159 #endif
 160 /* Network loop state */
 161 enum net_loop_state net_state;
 162 /* Tried all network devices */
 163 int             net_restart_wrap;
 164 /* Network loop restarted */
 165 static int      net_restarted;
 166 /* At least one device configured */
 167 static int      net_dev_exists;
 168
 169 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
 170 /* default is without VLAN */
 171 ushort          net_our_vlan = 0xFFFF;
 172 /* ditto */
 173 ushort          net_native_vlan = 0xFFFF;
 174
 175 /* Boot File name */
 176 char net_boot_file_name[1024];
 177 /* Indicates whether the file name was specified on the command line */
 178 bool net_boot_file_name_explicit;
 179 /* The actual transferred size of the bootfile (in bytes) */
 180 u32 net_boot_file_size;
 181 /* Boot file size in blocks as reported by the DHCP server */
 182 u32 net_boot_file_expected_size_in_blocks;
 183
 184 static uchar net_pkt_buf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 185 /* Receive packets */
 186 uchar *net_rx_packets[PKTBUFSRX];
 187 /* Current UDP RX packet handler */
 188 static rxhand_f *udp_packet_handler;
 189 /* Current ARP RX packet handler */
 190 static rxhand_f *arp_packet_handler;
 191 #ifdef CONFIG_CMD_TFTPPUT
 192 /* Current ICMP rx handler */
 193 static rxhand_icmp_f *packet_icmp_handler;
 194 #endif
 195 /* Current timeout handler */
 196 static thand_f *time_handler;
 197 /* Time base value */
 198 static ulong    time_start;
 199 /* Current timeout value */
 200 static ulong    time_delta;
 201 /* THE transmit packet */
 202 uchar *net_tx_packet;
 203
 204 static int net_check_prereq(enum proto_t protocol);
 205
 206 static int net_try_count;
 207
 208 int __maybe_unused net_busy_flag;
 209
 210 /**********************************************************************/
 211
 212 static int on_ipaddr(const char *name, const char *value, enum env_op op,
 213         int flags)
 214 {
 215         if (flags & H_PROGRAMMATIC)
 216                 return 0;
 217
 218         net_ip = string_to_ip(value);
 219
 220         return 0;
 221 }
 222 U_BOOT_ENV_CALLBACK(ipaddr, on_ipaddr);
 223
 224 static int on_gatewayip(const char *name, const char *value, enum env_op op,
 225         int flags)
 226 {
 227         if (flags & H_PROGRAMMATIC)
 228                 return 0;
 229
 230         net_gateway = string_to_ip(value);
 231
 232         return 0;
 233 }
 234 U_BOOT_ENV_CALLBACK(gatewayip, on_gatewayip);
 235
 236 static int on_netmask(const char *name, const char *value, enum env_op op,
 237         int flags)
 238 {
 239         if (flags & H_PROGRAMMATIC)
 240                 return 0;
 241
 242         net_netmask = string_to_ip(value);
 243
 244         return 0;
 245 }
 246 U_BOOT_ENV_CALLBACK(netmask, on_netmask);
 247
 248 static int on_serverip(const char *name, const char *value, enum env_op op,
 249         int flags)
 250 {
 251         if (flags & H_PROGRAMMATIC)
 252                 return 0;
 253
 254         net_server_ip = string_to_ip(value);
 255
 256         return 0;
 257 }
 258 U_BOOT_ENV_CALLBACK(serverip, on_serverip);
 259
 260 static int on_nvlan(const char *name, const char *value, enum env_op op,
 261         int flags)
 262 {
 263         if (flags & H_PROGRAMMATIC)
 264                 return 0;
 265
 266         net_native_vlan = string_to_vlan(value);
 267
 268         return 0;
 269 }
 270 U_BOOT_ENV_CALLBACK(nvlan, on_nvlan);
 271
 272 static int on_vlan(const char *name, const char *value, enum env_op op,
 273         int flags)
 274 {
 275         if (flags & H_PROGRAMMATIC)
 276                 return 0;
 277
 278         net_our_vlan = string_to_vlan(value);
 279
 280         return 0;
 281 }
 282 U_BOOT_ENV_CALLBACK(vlan, on_vlan);
 283
 284 #if defined(CONFIG_CMD_DNS)
 285 static int on_dnsip(const char *name, const char *value, enum env_op op,
 286         int flags)
 287 {
 288         if (flags & H_PROGRAMMATIC)
 289                 return 0;
 290
 291         net_dns_server = string_to_ip(value);
 292
 293         return 0;
 294 }
 295 U_BOOT_ENV_CALLBACK(dnsip, on_dnsip);
 296 #endif
 297
 298 /*
 299  * Check if autoload is enabled. If so, use either NFS or TFTP to download
 300  * the boot file.
 301  */
 302 void net_auto_load(void)
 303 {
 304 #if defined(CONFIG_CMD_NFS) && !defined(CONFIG_SPL_BUILD)
 305         const char *s = env_get("autoload");
 306
 307         if (s != NULL && strcmp(s, "NFS") == 0) {
 308                 if (net_check_prereq(NFS)) {
 309 /* We aren't expecting to get a serverip, so just accept the assigned IP */
 310                         if (IS_ENABLED(CONFIG_BOOTP_SERVERIP)) {
 311                                 net_set_state(NETLOOP_SUCCESS);
 312                         } else {
 313                                 printf("Cannot autoload with NFS\n");
 314                                 net_set_state(NETLOOP_FAIL);
 315                         }
 316                         return;
 317                 }
 318                 /*
 319                  * Use NFS to load the bootfile.
 320                  */
 321                 nfs_start();
 322                 return;
 323         }
 324 #endif
 325         if (env_get_yesno("autoload") == 0) {
 326                 /*
 327                  * Just use BOOTP/RARP to configure system;
 328                  * Do not use TFTP to load the bootfile.
 329                  */
 330                 net_set_state(NETLOOP_SUCCESS);
 331                 return;
 332         }
 333         if (net_check_prereq(TFTPGET)) {
 334 /* We aren't expecting to get a serverip, so just accept the assigned IP */
 335                 if (IS_ENABLED(CONFIG_BOOTP_SERVERIP)) {
 336                         net_set_state(NETLOOP_SUCCESS);
 337                 } else {
 338                         printf("Cannot autoload with TFTPGET\n");
 339                         net_set_state(NETLOOP_FAIL);
 340                 }
 341                 return;
 342         }
 343         tftp_start(TFTPGET);
 344 }
 345
 346 static int net_init_loop(void)
 347 {
 348         if (eth_get_dev()) {
 349                 memcpy(net_ethaddr, eth_get_ethaddr(), 6);
 350
 351                 if (IS_ENABLED(CONFIG_IPV6)) {
 352                         ip6_make_lladdr(&net_link_local_ip6, net_ethaddr);
 353                         if (!memcmp(&net_ip6, &net_null_addr_ip6,
 354                                     sizeof(struct in6_addr)))
 355                                 memcpy(&net_ip6, &net_link_local_ip6,
 356                                        sizeof(struct in6_addr));
 357                 }
 358         }
 359         else
 360                 /*
 361                  * Not ideal, but there's no way to get the actual error, and I
 362                  * don't feel like fixing all the users of eth_get_dev to deal
 363                  * with errors.
 364                  */
 365                 return -ENONET;
 366
 367         return 0;
 368 }
 369
 370 static void net_clear_handlers(void)
 371 {
 372         net_set_udp_handler(NULL);
 373         net_set_arp_handler(NULL);
 374         net_set_timeout_handler(0, NULL);
 375 }
 376
 377 static void net_cleanup_loop(void)
 378 {
 379         net_clear_handlers();
 380 }
 381
 382 int net_init(void)
 383 {
 384         static int first_call = 1;
 385
 386         if (first_call) {
 387                 /*
 388                  *      Setup packet buffers, aligned correctly.
 389                  */
 390                 int i;
 391
 392                 net_tx_packet = &net_pkt_buf[0] + (PKTALIGN - 1);
 393                 net_tx_packet -= (ulong)net_tx_packet % PKTALIGN;
 394                 for (i = 0; i < PKTBUFSRX; i++) {
 395                         net_rx_packets[i] = net_tx_packet +
 396                                 (i + 1) * PKTSIZE_ALIGN;
 397                 }
 398                 arp_init();
 399                 ndisc_init();
 400                 net_clear_handlers();
 401
 402                 /* Only need to setup buffer pointers once. */
 403                 first_call = 0;
 404                 if (IS_ENABLED(CONFIG_PROT_TCP))
 405                         tcp_set_tcp_state(TCP_CLOSED);
 406         }
 407
 408         return net_init_loop();
 409 }
 410
 411 /**********************************************************************/
 412 /*
 413  *      Main network processing loop.
 414  */
 415
 416 int net_loop(enum proto_t protocol)
 417 {
 418         int ret = -EINVAL;
 419         enum net_loop_state prev_net_state = net_state;
 420
 421 #if defined(CONFIG_CMD_PING)
 422         if (protocol != PING)
 423                 net_ping_ip.s_addr = 0;
 424 #endif
 425         net_restarted = 0;
 426         net_dev_exists = 0;
 427         net_try_count = 1;
 428         debug_cond(DEBUG_INT_STATE, "--- net_loop Entry\n");
 429
 430 #ifdef CONFIG_PHY_NCSI
 431         if (phy_interface_is_ncsi() && protocol != NCSI && !ncsi_active()) {
 432                 printf("%s: configuring NCSI first\n", __func__);
 433                 if (net_loop(NCSI) < 0)
 434                         return ret;
 435                 eth_init_state_only();
 436                 goto restart;
 437         }
 438 #endif
 439
 440         bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
 441         net_init();
 442         if (eth_is_on_demand_init()) {
 443                 eth_halt();
 444                 eth_set_current();
 445                 ret = eth_init();
 446                 if (ret < 0) {
 447                         eth_halt();
 448                         return ret;
 449                 }
 450         } else {
 451                 eth_init_state_only();
 452         }
 453
 454 restart:
 455 #ifdef CONFIG_USB_KEYBOARD
 456         net_busy_flag = 0;
 457 #endif
 458         net_set_state(NETLOOP_CONTINUE);
 459
 460         /*
 461          *      Start the ball rolling with the given start function.  From
 462          *      here on, this code is a state machine driven by received
 463          *      packets and timer events.
 464          */
 465         debug_cond(DEBUG_INT_STATE, "--- net_loop Init\n");
 466         net_init_loop();
 467
 468         switch (net_check_prereq(protocol)) {
 469         case 1:
 470                 /* network not configured */
 471                 eth_halt();
 472                 net_set_state(prev_net_state);
 473                 return -ENODEV;
 474
 475         case 2:
 476                 /* network device not configured */
 477                 break;
 478
 479         case 0:
 480                 net_dev_exists = 1;
 481                 net_boot_file_size = 0;
 482                 switch (protocol) {
 483 #ifdef CONFIG_CMD_TFTPBOOT
 484                 case TFTPGET:
 485 #ifdef CONFIG_CMD_TFTPPUT
 486                 case TFTPPUT:
 487 #endif
 488                         /* always use ARP to get server ethernet address */
 489                         tftp_start(protocol);
 490                         break;
 491 #endif
 492 #ifdef CONFIG_CMD_TFTPSRV
 493                 case TFTPSRV:
 494                         tftp_start_server();
 495                         break;
 496 #endif
 497 #ifdef CONFIG_UDP_FUNCTION_FASTBOOT
 498                 case FASTBOOT:
 499                         fastboot_start_server();
 500                         break;
 501 #endif
 502 #if defined(CONFIG_CMD_DHCP)
 503                 case DHCP:
 504                         bootp_reset();
 505                         net_ip.s_addr = 0;
 506                         dhcp_request();         /* Basically same as BOOTP */
 507                         break;
 508 #endif
 509 #if defined(CONFIG_CMD_BOOTP)
 510                 case BOOTP:
 511                         bootp_reset();
 512                         net_ip.s_addr = 0;
 513                         bootp_request();
 514                         break;
 515 #endif
 516 #if defined(CONFIG_CMD_RARP)
 517                 case RARP:
 518                         rarp_try = 0;
 519                         net_ip.s_addr = 0;
 520                         rarp_request();
 521                         break;
 522 #endif
 523 #if defined(CONFIG_CMD_PING)
 524                 case PING:
 525                         ping_start();
 526                         break;
 527 #endif
 528 #if defined(CONFIG_CMD_PING6)
 529                 case PING6:
 530                         ping6_start();
 531                         break;
 532 #endif
 533 #if defined(CONFIG_CMD_NFS) && !defined(CONFIG_SPL_BUILD)
 534                 case NFS:
 535                         nfs_start();
 536                         break;
 537 #endif
 538 #if defined(CONFIG_CMD_WGET)
 539                 case WGET:
 540                         wget_start();
 541                         break;
 542 #endif
 543 #if defined(CONFIG_CMD_CDP)
 544                 case CDP:
 545                         cdp_start();
 546                         break;
 547 #endif
 548 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
 549                 case NETCONS:
 550                         nc_start();
 551                         break;
 552 #endif
 553 #if defined(CONFIG_CMD_DNS)
 554                 case DNS:
 555                         dns_start();
 556                         break;
 557 #endif
 558 #if defined(CONFIG_CMD_LINK_LOCAL)
 559                 case LINKLOCAL:
 560                         link_local_start();
 561                         break;
 562 #endif
 563 #if defined(CONFIG_CMD_WOL)
 564                 case WOL:
 565                         wol_start();
 566                         break;
 567 #endif
 568 #if defined(CONFIG_PHY_NCSI)
 569                 case NCSI:
 570                         ncsi_probe_packages();
 571                         break;
 572 #endif
 573                 default:
 574                         break;
 575                 }
 576
 577                 if (IS_ENABLED(CONFIG_PROT_UDP) && protocol == UDP)
 578                         udp_start();
 579
 580                 break;
 581         }
 582
 583 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 584 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 585         defined(CONFIG_LED_STATUS)                      && \
 586         defined(CONFIG_LED_STATUS_RED)
 587         /*
 588          * Echo the inverted link state to the fault LED.
 589          */
 590         if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
 591                 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_OFF);
 592         else
 593                 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_ON);
 594 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 595 #endif /* CONFIG_MII, ... */
 596 #ifdef CONFIG_USB_KEYBOARD
 597         net_busy_flag = 1;
 598 #endif
 599
 600         /*
 601          *      Main packet reception loop.  Loop receiving packets until
 602          *      someone sets `net_state' to a state that terminates.
 603          */
 604         for (;;) {
 605                 schedule();
 606                 if (arp_timeout_check() > 0)
 607                         time_start = get_timer(0);
 608
 609                 if (IS_ENABLED(CONFIG_IPV6)) {
 610                         if (use_ip6 && (ndisc_timeout_check() > 0))
 611                                 time_start = get_timer(0);
 612                 }
 613
 614                 /*
 615                  *      Check the ethernet for a new packet.  The ethernet
 616                  *      receive routine will process it.
 617                  *      Most drivers return the most recent packet size, but not
 618                  *      errors that may have happened.
 619                  */
 620                 eth_rx();
 621
 622                 /*
 623                  *      Abort if ctrl-c was pressed.
 624                  */
 625                 if (ctrlc()) {
 626                         /* cancel any ARP that may not have completed */
 627                         net_arp_wait_packet_ip.s_addr = 0;
 628
 629                         net_cleanup_loop();
 630                         eth_halt();
 631                         /* Invalidate the last protocol */
 632                         eth_set_last_protocol(BOOTP);
 633
 634                         puts("\nAbort\n");
 635                         /* include a debug print as well incase the debug
 636                            messages are directed to stderr */
 637                         debug_cond(DEBUG_INT_STATE, "--- net_loop Abort!\n");
 638                         ret = -EINTR;
 639                         goto done;
 640                 }
 641
 642                 /*
 643                  *      Check for a timeout, and run the timeout handler
 644                  *      if we have one.
 645                  */
 646                 if (time_handler &&
 647                     ((get_timer(0) - time_start) > time_delta)) {
 648                         thand_f *x;
 649
 650 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 651 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 652         defined(CONFIG_LED_STATUS)                      && \
 653         defined(CONFIG_LED_STATUS_RED)
 654                         /*
 655                          * Echo the inverted link state to the fault LED.
 656                          */
 657                         if (miiphy_link(eth_get_dev()->name,
 658                                         CONFIG_SYS_FAULT_MII_ADDR))
 659                                 status_led_set(CONFIG_LED_STATUS_RED,
 660                                                CONFIG_LED_STATUS_OFF);
 661                         else
 662                                 status_led_set(CONFIG_LED_STATUS_RED,
 663                                                CONFIG_LED_STATUS_ON);
 664 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 665 #endif /* CONFIG_MII, ... */
 666                         debug_cond(DEBUG_INT_STATE, "--- net_loop timeout\n");
 667                         x = time_handler;
 668                         time_handler = (thand_f *)0;
 669                         (*x)();
 670                 }
 671
 672                 if (net_state == NETLOOP_FAIL)
 673                         ret = net_start_again();
 674
 675                 switch (net_state) {
 676                 case NETLOOP_RESTART:
 677                         net_restarted = 1;
 678                         goto restart;
 679
 680                 case NETLOOP_SUCCESS:
 681                         net_cleanup_loop();
 682                         if (net_boot_file_size > 0) {
 683                                 printf("Bytes transferred = %d (%x hex)\n",
 684                                        net_boot_file_size, net_boot_file_size);
 685                                 env_set_hex("filesize", net_boot_file_size);
 686                                 env_set_hex("fileaddr", image_load_addr);
 687                         }
 688                         if (protocol != NETCONS && protocol != NCSI)
 689                                 eth_halt();
 690                         else
 691                                 eth_halt_state_only();
 692
 693                         eth_set_last_protocol(protocol);
 694
 695                         ret = net_boot_file_size;
 696                         debug_cond(DEBUG_INT_STATE, "--- net_loop Success!\n");
 697                         goto done;
 698
 699                 case NETLOOP_FAIL:
 700                         net_cleanup_loop();
 701                         /* Invalidate the last protocol */
 702                         eth_set_last_protocol(BOOTP);
 703                         debug_cond(DEBUG_INT_STATE, "--- net_loop Fail!\n");
 704                         ret = -ENONET;
 705                         goto done;
 706
 707                 case NETLOOP_CONTINUE:
 708                         continue;
 709                 }
 710         }
 711
 712 done:
 713 #ifdef CONFIG_USB_KEYBOARD
 714         net_busy_flag = 0;
 715 #endif
 716 #ifdef CONFIG_CMD_TFTPPUT
 717         /* Clear out the handlers */
 718         net_set_udp_handler(NULL);
 719         net_set_icmp_handler(NULL);
 720 #endif
 721         net_set_state(prev_net_state);
 722
 723 #if defined(CONFIG_CMD_PCAP)
 724         if (pcap_active())
 725                 pcap_print_status();
 726 #endif
 727         return ret;
 728 }
 729
 730 /**********************************************************************/
 731
 732 static void start_again_timeout_handler(void)
 733 {
 734         net_set_state(NETLOOP_RESTART);
 735 }
 736
 737 int net_start_again(void)
 738 {
 739         char *nretry;
 740         int retry_forever = 0;
 741         unsigned long retrycnt = 0;
 742         int ret;
 743
 744         nretry = env_get("netretry");
 745         if (nretry) {
 746                 if (!strcmp(nretry, "yes"))
 747                         retry_forever = 1;
 748                 else if (!strcmp(nretry, "no"))
 749                         retrycnt = 0;
 750                 else if (!strcmp(nretry, "once"))
 751                         retrycnt = 1;
 752                 else
 753                         retrycnt = simple_strtoul(nretry, NULL, 0);
 754         } else {
 755                 retrycnt = 0;
 756                 retry_forever = 0;
 757         }
 758
 759         if ((!retry_forever) && (net_try_count > retrycnt)) {
 760                 eth_halt();
 761                 net_set_state(NETLOOP_FAIL);
 762                 /*
 763                  * We don't provide a way for the protocol to return an error,
 764                  * but this is almost always the reason.
 765                  */
 766                 return -ETIMEDOUT;
 767         }
 768
 769         net_try_count++;
 770
 771         eth_halt();
 772 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
 773         eth_try_another(!net_restarted);
 774 #endif
 775         ret = eth_init();
 776         if (net_restart_wrap) {
 777                 net_restart_wrap = 0;
 778                 if (net_dev_exists) {
 779                         net_set_timeout_handler(10000UL,
 780                                                 start_again_timeout_handler);
 781                         net_set_udp_handler(NULL);
 782                 } else {
 783                         net_set_state(NETLOOP_FAIL);
 784                 }
 785         } else {
 786                 net_set_state(NETLOOP_RESTART);
 787         }
 788         return ret;
 789 }
 790
 791 /**********************************************************************/
 792 /*
 793  *      Miscelaneous bits.
 794  */
 795
 796 static void dummy_handler(uchar *pkt, unsigned dport,
 797                         struct in_addr sip, unsigned sport,
 798                         unsigned len)
 799 {
 800 }
 801
 802 rxhand_f *net_get_udp_handler(void)
 803 {
 804         return udp_packet_handler;
 805 }
 806
 807 void net_set_udp_handler(rxhand_f *f)
 808 {
 809         debug_cond(DEBUG_INT_STATE, "--- net_loop UDP handler set (%p)\n", f);
 810         if (f == NULL)
 811                 udp_packet_handler = dummy_handler;
 812         else
 813                 udp_packet_handler = f;
 814 }
 815
 816 rxhand_f *net_get_arp_handler(void)
 817 {
 818         return arp_packet_handler;
 819 }
 820
 821 void net_set_arp_handler(rxhand_f *f)
 822 {
 823         debug_cond(DEBUG_INT_STATE, "--- net_loop ARP handler set (%p)\n", f);
 824         if (f == NULL)
 825                 arp_packet_handler = dummy_handler;
 826         else
 827                 arp_packet_handler = f;
 828 }
 829
 830 #ifdef CONFIG_CMD_TFTPPUT
 831 void net_set_icmp_handler(rxhand_icmp_f *f)
 832 {
 833         packet_icmp_handler = f;
 834 }
 835 #endif
 836
 837 void net_set_timeout_handler(ulong iv, thand_f *f)
 838 {
 839         if (iv == 0) {
 840                 debug_cond(DEBUG_INT_STATE,
 841                            "--- net_loop timeout handler cancelled\n");
 842                 time_handler = (thand_f *)0;
 843         } else {
 844                 debug_cond(DEBUG_INT_STATE,
 845                            "--- net_loop timeout handler set (%p)\n", f);
 846                 time_handler = f;
 847                 time_start = get_timer(0);
 848                 time_delta = iv * CONFIG_SYS_HZ / 1000;
 849         }
 850 }
 851
 852 uchar *net_get_async_tx_pkt_buf(void)
 853 {
 854         if (arp_is_waiting())
 855                 return arp_tx_packet; /* If we are waiting, we already sent */
 856         else
 857                 return net_tx_packet;
 858 }
 859
 860 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
 861                 int payload_len)
 862 {
 863         return net_send_ip_packet(ether, dest, dport, sport, payload_len,
 864                                   IPPROTO_UDP, 0, 0, 0);
 865 }
 866
 867 #if defined(CONFIG_PROT_TCP)
 868 int net_send_tcp_packet(int payload_len, int dport, int sport, u8 action,
 869                         u32 tcp_seq_num, u32 tcp_ack_num)
 870 {
 871         return net_send_ip_packet(net_server_ethaddr, net_server_ip, dport,
 872                                   sport, payload_len, IPPROTO_TCP, action,
 873                                   tcp_seq_num, tcp_ack_num);
 874 }
 875 #endif
 876
 877 int net_send_ip_packet(uchar *ether, struct in_addr dest, int dport, int sport,
 878                        int payload_len, int proto, u8 action, u32 tcp_seq_num,
 879                        u32 tcp_ack_num)
 880 {
 881         uchar *pkt;
 882         int eth_hdr_size;
 883         int pkt_hdr_size;
 884
 885         /* make sure the net_tx_packet is initialized (net_init() was called) */
 886         assert(net_tx_packet != NULL);
 887         if (net_tx_packet == NULL)
 888                 return -1;
 889
 890         /* convert to new style broadcast */
 891         if (dest.s_addr == 0)
 892                 dest.s_addr = 0xFFFFFFFF;
 893
 894         /* if broadcast, make the ether address a broadcast and don't do ARP */
 895         if (dest.s_addr == 0xFFFFFFFF)
 896                 ether = (uchar *)net_bcast_ethaddr;
 897
 898         pkt = (uchar *)net_tx_packet;
 899
 900         eth_hdr_size = net_set_ether(pkt, ether, PROT_IP);
 901
 902         switch (proto) {
 903         case IPPROTO_UDP:
 904                 net_set_udp_header(pkt + eth_hdr_size, dest, dport, sport,
 905                                    payload_len);
 906                 pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
 907                 break;
 908 #if defined(CONFIG_PROT_TCP)
 909         case IPPROTO_TCP:
 910                 pkt_hdr_size = eth_hdr_size
 911                         + tcp_set_tcp_header(pkt + eth_hdr_size, dport, sport,
 912                                              payload_len, action, tcp_seq_num,
 913                                              tcp_ack_num);
 914                 break;
 915 #endif
 916         default:
 917                 return -EINVAL;
 918         }
 919
 920         /* if MAC address was not discovered yet, do an ARP request */
 921         if (memcmp(ether, net_null_ethaddr, 6) == 0) {
 922                 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest);
 923
 924                 /* save the ip and eth addr for the packet to send after arp */
 925                 net_arp_wait_packet_ip = dest;
 926                 arp_wait_packet_ethaddr = ether;
 927
 928                 /* size of the waiting packet */
 929                 arp_wait_tx_packet_size = pkt_hdr_size + payload_len;
 930
 931                 /* and do the ARP request */
 932                 arp_wait_try = 1;
 933                 arp_wait_timer_start = get_timer(0);
 934                 arp_request();
 935                 return 1;       /* waiting */
 936         } else {
 937                 debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
 938                            &dest, ether);
 939                 net_send_packet(net_tx_packet, pkt_hdr_size + payload_len);
 940                 return 0;       /* transmitted */
 941         }
 942 }
 943
 944 #ifdef CONFIG_IP_DEFRAG
 945 /*
 946  * This function collects fragments in a single packet, according
 947  * to the algorithm in RFC815. It returns NULL or the pointer to
 948  * a complete packet, in static storage
 949  */
 950 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG)
 951
 952 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE)
 953
 954 /*
 955  * this is the packet being assembled, either data or frag control.
 956  * Fragments go by 8 bytes, so this union must be 8 bytes long
 957  */
 958 struct hole {
 959         /* first_byte is address of this structure */
 960         u16 last_byte;  /* last byte in this hole + 1 (begin of next hole) */
 961         u16 next_hole;  /* index of next (in 8-b blocks), 0 == none */
 962         u16 prev_hole;  /* index of prev, 0 == none */
 963         u16 unused;
 964 };
 965
 966 static struct ip_udp_hdr *__net_defragment(struct ip_udp_hdr *ip, int *lenp)
 967 {
 968         static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
 969         static u16 first_hole, total_len;
 970         struct hole *payload, *thisfrag, *h, *newh;
 971         struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff;
 972         uchar *indata = (uchar *)ip;
 973         int offset8, start, len, done = 0;
 974         u16 ip_off = ntohs(ip->ip_off);
 975
 976         /*
 977          * Calling code already rejected <, but we don't have to deal
 978          * with an IP fragment with no payload.
 979          */
 980         if (ntohs(ip->ip_len) <= IP_HDR_SIZE)
 981                 return NULL;
 982
 983         /* payload starts after IP header, this fragment is in there */
 984         payload = (struct hole *)(pkt_buff + IP_HDR_SIZE);
 985         offset8 =  (ip_off & IP_OFFS);
 986         thisfrag = payload + offset8;
 987         start = offset8 * 8;
 988         len = ntohs(ip->ip_len) - IP_HDR_SIZE;
 989
 990         /* All but last fragment must have a multiple-of-8 payload. */
 991         if ((len & 7) && (ip_off & IP_FLAGS_MFRAG))
 992                 return NULL;
 993
 994         if (start + len > IP_MAXUDP) /* fragment extends too far */
 995                 return NULL;
 996
 997         if (!total_len || localip->ip_id != ip->ip_id) {
 998                 /* new (or different) packet, reset structs */
 999                 total_len = 0xffff;
1000                 payload[0].last_byte = ~0;
1001                 payload[0].next_hole = 0;
1002                 payload[0].prev_hole = 0;
1003                 first_hole = 0;
1004                 /* any IP header will work, copy the first we received */
1005                 memcpy(localip, ip, IP_HDR_SIZE);
1006         }
1007
1008         /*
1009          * What follows is the reassembly algorithm. We use the payload
1010          * array as a linked list of hole descriptors, as each hole starts
1011          * at a multiple of 8 bytes. However, last byte can be whatever value,
1012          * so it is represented as byte count, not as 8-byte blocks.
1013          */
1014
1015         h = payload + first_hole;
1016         while (h->last_byte < start) {
1017                 if (!h->next_hole) {
1018                         /* no hole that far away */
1019                         return NULL;
1020                 }
1021                 h = payload + h->next_hole;
1022         }
1023
1024         /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
1025         if (offset8 + ((len + 7) / 8) <= h - payload) {
1026                 /* no overlap with holes (dup fragment?) */
1027                 return NULL;
1028         }
1029
1030         if (!(ip_off & IP_FLAGS_MFRAG)) {
1031                 /* no more fragmentss: truncate this (last) hole */
1032                 total_len = start + len;
1033                 h->last_byte = start + len;
1034         }
1035
1036         /*
1037          * There is some overlap: fix the hole list. This code deals
1038          * with a fragment that overlaps with two different holes
1039          * (thus being a superset of a previously-received fragment)
1040          * by only using the part of the fragment that fits in the
1041          * first hole.
1042          */
1043         if (h->last_byte < start + len)
1044                 len = h->last_byte - start;
1045
1046         if ((h >= thisfrag) && (h->last_byte <= start + len)) {
1047                 /* complete overlap with hole: remove hole */
1048                 if (!h->prev_hole && !h->next_hole) {
1049                         /* last remaining hole */
1050                         done = 1;
1051                 } else if (!h->prev_hole) {
1052                         /* first hole */
1053                         first_hole = h->next_hole;
1054                         payload[h->next_hole].prev_hole = 0;
1055                 } else if (!h->next_hole) {
1056                         /* last hole */
1057                         payload[h->prev_hole].next_hole = 0;
1058                 } else {
1059                         /* in the middle of the list */
1060                         payload[h->next_hole].prev_hole = h->prev_hole;
1061                         payload[h->prev_hole].next_hole = h->next_hole;
1062                 }
1063
1064         } else if (h->last_byte <= start + len) {
1065                 /* overlaps with final part of the hole: shorten this hole */
1066                 h->last_byte = start;
1067
1068         } else if (h >= thisfrag) {
1069                 /* overlaps with initial part of the hole: move this hole */
1070                 newh = thisfrag + (len / 8);
1071                 *newh = *h;
1072                 h = newh;
1073                 if (h->next_hole)
1074                         payload[h->next_hole].prev_hole = (h - payload);
1075                 if (h->prev_hole)
1076                         payload[h->prev_hole].next_hole = (h - payload);
1077                 else
1078                         first_hole = (h - payload);
1079
1080         } else {
1081                 /* fragment sits in the middle: split the hole */
1082                 newh = thisfrag + (len / 8);
1083                 *newh = *h;
1084                 h->last_byte = start;
1085                 h->next_hole = (newh - payload);
1086                 newh->prev_hole = (h - payload);
1087                 if (newh->next_hole)
1088                         payload[newh->next_hole].prev_hole = (newh - payload);
1089         }
1090
1091         /* finally copy this fragment and possibly return whole packet */
1092         memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len);
1093         if (!done)
1094                 return NULL;
1095
1096         *lenp = total_len + IP_HDR_SIZE;
1097         localip->ip_len = htons(*lenp);
1098         return localip;
1099 }
1100
1101 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
1102         int *lenp)
1103 {
1104         u16 ip_off = ntohs(ip->ip_off);
1105         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1106                 return ip; /* not a fragment */
1107         return __net_defragment(ip, lenp);
1108 }
1109
1110 #else /* !CONFIG_IP_DEFRAG */
1111
1112 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
1113         int *lenp)
1114 {
1115         u16 ip_off = ntohs(ip->ip_off);
1116         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1117                 return ip; /* not a fragment */
1118         return NULL;
1119 }
1120 #endif
1121
1122 /**
1123  * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
1124  * drop others.
1125  *
1126  * @parma ip    IP packet containing the ICMP
1127  */
1128 static void receive_icmp(struct ip_udp_hdr *ip, int len,
1129                         struct in_addr src_ip, struct ethernet_hdr *et)
1130 {
1131         struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
1132
1133         switch (icmph->type) {
1134         case ICMP_REDIRECT:
1135                 if (icmph->code != ICMP_REDIR_HOST)
1136                         return;
1137                 printf(" ICMP Host Redirect to %pI4 ",
1138                        &icmph->un.gateway);
1139                 break;
1140         default:
1141 #if defined(CONFIG_CMD_PING)
1142                 ping_receive(et, ip, len);
1143 #endif
1144 #ifdef CONFIG_CMD_TFTPPUT
1145                 if (packet_icmp_handler)
1146                         packet_icmp_handler(icmph->type, icmph->code,
1147                                             ntohs(ip->udp_dst), src_ip,
1148                                             ntohs(ip->udp_src), icmph->un.data,
1149                                             ntohs(ip->udp_len));
1150 #endif
1151                 break;
1152         }
1153 }
1154
1155 void net_process_received_packet(uchar *in_packet, int len)
1156 {
1157         struct ethernet_hdr *et;
1158         struct ip_udp_hdr *ip;
1159         struct in_addr dst_ip;
1160         struct in_addr src_ip;
1161         int eth_proto;
1162 #if defined(CONFIG_CMD_CDP)
1163         int iscdp;
1164 #endif
1165         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1166
1167         debug_cond(DEBUG_NET_PKT, "packet received\n");
1168
1169 #if defined(CONFIG_CMD_PCAP)
1170         pcap_post(in_packet, len, false);
1171 #endif
1172         net_rx_packet = in_packet;
1173         net_rx_packet_len = len;
1174         et = (struct ethernet_hdr *)in_packet;
1175
1176         /* too small packet? */
1177         if (len < ETHER_HDR_SIZE)
1178                 return;
1179
1180 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
1181         if (push_packet) {
1182                 (*push_packet)(in_packet, len);
1183                 return;
1184         }
1185 #endif
1186
1187 #if defined(CONFIG_CMD_CDP)
1188         /* keep track if packet is CDP */
1189         iscdp = is_cdp_packet(et->et_dest);
1190 #endif
1191
1192         myvlanid = ntohs(net_our_vlan);
1193         if (myvlanid == (ushort)-1)
1194                 myvlanid = VLAN_NONE;
1195         mynvlanid = ntohs(net_native_vlan);
1196         if (mynvlanid == (ushort)-1)
1197                 mynvlanid = VLAN_NONE;
1198
1199         eth_proto = ntohs(et->et_protlen);
1200
1201         if (eth_proto < 1514) {
1202                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1203                 /*
1204                  *      Got a 802.2 packet.  Check the other protocol field.
1205                  *      XXX VLAN over 802.2+SNAP not implemented!
1206                  */
1207                 eth_proto = ntohs(et802->et_prot);
1208
1209                 ip = (struct ip_udp_hdr *)(in_packet + E802_HDR_SIZE);
1210                 len -= E802_HDR_SIZE;
1211
1212         } else if (eth_proto != PROT_VLAN) {    /* normal packet */
1213                 ip = (struct ip_udp_hdr *)(in_packet + ETHER_HDR_SIZE);
1214                 len -= ETHER_HDR_SIZE;
1215
1216         } else {                        /* VLAN packet */
1217                 struct vlan_ethernet_hdr *vet =
1218                         (struct vlan_ethernet_hdr *)et;
1219
1220                 debug_cond(DEBUG_NET_PKT, "VLAN packet received\n");
1221
1222                 /* too small packet? */
1223                 if (len < VLAN_ETHER_HDR_SIZE)
1224                         return;
1225
1226                 /* if no VLAN active */
1227                 if ((ntohs(net_our_vlan) & VLAN_IDMASK) == VLAN_NONE
1228 #if defined(CONFIG_CMD_CDP)
1229                                 && iscdp == 0
1230 #endif
1231                                 )
1232                         return;
1233
1234                 cti = ntohs(vet->vet_tag);
1235                 vlanid = cti & VLAN_IDMASK;
1236                 eth_proto = ntohs(vet->vet_type);
1237
1238                 ip = (struct ip_udp_hdr *)(in_packet + VLAN_ETHER_HDR_SIZE);
1239                 len -= VLAN_ETHER_HDR_SIZE;
1240         }
1241
1242         debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto);
1243
1244 #if defined(CONFIG_CMD_CDP)
1245         if (iscdp) {
1246                 cdp_receive((uchar *)ip, len);
1247                 return;
1248         }
1249 #endif
1250
1251         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1252                 if (vlanid == VLAN_NONE)
1253                         vlanid = (mynvlanid & VLAN_IDMASK);
1254                 /* not matched? */
1255                 if (vlanid != (myvlanid & VLAN_IDMASK))
1256                         return;
1257         }
1258
1259         switch (eth_proto) {
1260         case PROT_ARP:
1261                 arp_receive(et, ip, len);
1262                 break;
1263
1264 #ifdef CONFIG_CMD_RARP
1265         case PROT_RARP:
1266                 rarp_receive(ip, len);
1267                 break;
1268 #endif
1269 #if IS_ENABLED(CONFIG_IPV6)
1270         case PROT_IP6:
1271                 net_ip6_handler(et, (struct ip6_hdr *)ip, len);
1272                 break;
1273 #endif
1274         case PROT_IP:
1275                 debug_cond(DEBUG_NET_PKT, "Got IP\n");
1276                 /* Before we start poking the header, make sure it is there */
1277                 if (len < IP_HDR_SIZE) {
1278                         debug("len bad %d < %lu\n", len,
1279                               (ulong)IP_HDR_SIZE);
1280                         return;
1281                 }
1282                 /* Check the packet length */
1283                 if (len < ntohs(ip->ip_len)) {
1284                         debug("len bad %d < %d\n", len, ntohs(ip->ip_len));
1285                         return;
1286                 }
1287                 len = ntohs(ip->ip_len);
1288                 if (len < IP_HDR_SIZE) {
1289                         debug("bad ip->ip_len %d < %d\n", len, (int)IP_HDR_SIZE);
1290                         return;
1291                 }
1292                 debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n",
1293                            len, ip->ip_hl_v & 0xff);
1294
1295                 /* Can't deal with anything except IPv4 */
1296                 if ((ip->ip_hl_v & 0xf0) != 0x40)
1297                         return;
1298                 /* Can't deal with IP options (headers != 20 bytes) */
1299                 if ((ip->ip_hl_v & 0x0f) != 0x05)
1300                         return;
1301                 /* Check the Checksum of the header */
1302                 if (!ip_checksum_ok((uchar *)ip, IP_HDR_SIZE)) {
1303                         debug("checksum bad\n");
1304                         return;
1305                 }
1306                 /* If it is not for us, ignore it */
1307                 dst_ip = net_read_ip(&ip->ip_dst);
1308                 if (net_ip.s_addr && dst_ip.s_addr != net_ip.s_addr &&
1309                     dst_ip.s_addr != 0xFFFFFFFF) {
1310                                 return;
1311                 }
1312                 /* Read source IP address for later use */
1313                 src_ip = net_read_ip(&ip->ip_src);
1314                 /*
1315                  * The function returns the unchanged packet if it's not
1316                  * a fragment, and either the complete packet or NULL if
1317                  * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1318                  */
1319                 ip = net_defragment(ip, &len);
1320                 if (!ip)
1321                         return;
1322                 /*
1323                  * watch for ICMP host redirects
1324                  *
1325                  * There is no real handler code (yet). We just watch
1326                  * for ICMP host redirect messages. In case anybody
1327                  * sees these messages: please contact me
1328                  * ([email protected]), or - even better - send me the
1329                  * necessary fixes :-)
1330                  *
1331                  * Note: in all cases where I have seen this so far
1332                  * it was a problem with the router configuration,
1333                  * for instance when a router was configured in the
1334                  * BOOTP reply, but the TFTP server was on the same
1335                  * subnet. So this is probably a warning that your
1336                  * configuration might be wrong. But I'm not really
1337                  * sure if there aren't any other situations.
1338                  *
1339                  * Simon Glass <[email protected]>: We get an ICMP when
1340                  * we send a tftp packet to a dead connection, or when
1341                  * there is no server at the other end.
1342                  */
1343                 if (ip->ip_p == IPPROTO_ICMP) {
1344                         receive_icmp(ip, len, src_ip, et);
1345                         return;
1346 #if defined(CONFIG_PROT_TCP)
1347                 } else if (ip->ip_p == IPPROTO_TCP) {
1348                         debug_cond(DEBUG_DEV_PKT,
1349                                    "TCP PH (to=%pI4, from=%pI4, len=%d)\n",
1350                                    &dst_ip, &src_ip, len);
1351
1352                         rxhand_tcp_f((union tcp_build_pkt *)ip, len);
1353                         return;
1354 #endif
1355                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1356                         return;
1357                 }
1358
1359                 if (ntohs(ip->udp_len) < UDP_HDR_SIZE || ntohs(ip->udp_len) > len - IP_HDR_SIZE)
1360                         return;
1361
1362                 debug_cond(DEBUG_DEV_PKT,
1363                            "received UDP (to=%pI4, from=%pI4, len=%d)\n",
1364                            &dst_ip, &src_ip, len);
1365
1366                 if (IS_ENABLED(CONFIG_UDP_CHECKSUM) && ip->udp_xsum != 0) {
1367                         ulong   xsum;
1368                         u8 *sumptr;
1369                         ushort  sumlen;
1370
1371                         xsum  = ip->ip_p;
1372                         xsum += (ntohs(ip->udp_len));
1373                         xsum += (ntohl(ip->ip_src.s_addr) >> 16) & 0x0000ffff;
1374                         xsum += (ntohl(ip->ip_src.s_addr) >>  0) & 0x0000ffff;
1375                         xsum += (ntohl(ip->ip_dst.s_addr) >> 16) & 0x0000ffff;
1376                         xsum += (ntohl(ip->ip_dst.s_addr) >>  0) & 0x0000ffff;
1377
1378                         sumlen = ntohs(ip->udp_len);
1379                         sumptr = (u8 *)&ip->udp_src;
1380
1381                         while (sumlen > 1) {
1382                                 /* inlined ntohs() to avoid alignment errors */
1383                                 xsum += (sumptr[0] << 8) + sumptr[1];
1384                                 sumptr += 2;
1385                                 sumlen -= 2;
1386                         }
1387                         if (sumlen > 0)
1388                                 xsum += (sumptr[0] << 8) + sumptr[0];
1389                         while ((xsum >> 16) != 0) {
1390                                 xsum = (xsum & 0x0000ffff) +
1391                                        ((xsum >> 16) & 0x0000ffff);
1392                         }
1393                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1394                                 printf(" UDP wrong checksum %08lx %08x\n",
1395                                        xsum, ntohs(ip->udp_xsum));
1396                                 return;
1397                         }
1398                 }
1399
1400 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
1401                 nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
1402                                 src_ip,
1403                                 ntohs(ip->udp_dst),
1404                                 ntohs(ip->udp_src),
1405                                 ntohs(ip->udp_len) - UDP_HDR_SIZE);
1406 #endif
1407                 /*
1408                  * IP header OK.  Pass the packet to the current handler.
1409                  */
1410                 (*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE,
1411                                       ntohs(ip->udp_dst),
1412                                       src_ip,
1413                                       ntohs(ip->udp_src),
1414                                       ntohs(ip->udp_len) - UDP_HDR_SIZE);
1415                 break;
1416 #ifdef CONFIG_CMD_WOL
1417         case PROT_WOL:
1418                 wol_receive(ip, len);
1419                 break;
1420 #endif
1421 #ifdef CONFIG_PHY_NCSI
1422         case PROT_NCSI:
1423                 ncsi_receive(et, ip, len);
1424                 break;
1425 #endif
1426         }
1427 }
1428
1429 /**********************************************************************/
1430
1431 static int net_check_prereq(enum proto_t protocol)
1432 {
1433         switch (protocol) {
1434                 /* Fall through */
1435 #if defined(CONFIG_CMD_PING)
1436         case PING:
1437                 if (net_ping_ip.s_addr == 0) {
1438                         puts("*** ERROR: ping address not given\n");
1439                         return 1;
1440                 }
1441                 goto common;
1442 #endif
1443 #if defined(CONFIG_CMD_PING6)
1444         case PING6:
1445                 if (ip6_is_unspecified_addr(&net_ping_ip6)) {
1446                         puts("*** ERROR: ping address not given\n");
1447                         return 1;
1448                 }
1449                 goto common;
1450 #endif
1451 #if defined(CONFIG_CMD_DNS)
1452         case DNS:
1453                 if (net_dns_server.s_addr == 0) {
1454                         puts("*** ERROR: DNS server address not given\n");
1455                         return 1;
1456                 }
1457                 goto common;
1458 #endif
1459 #if defined(CONFIG_PROT_UDP)
1460         case UDP:
1461                 if (udp_prereq())
1462                         return 1;
1463                 goto common;
1464 #endif
1465
1466 #if defined(CONFIG_CMD_NFS)
1467         case NFS:
1468 #endif
1469                 /* Fall through */
1470         case TFTPGET:
1471         case TFTPPUT:
1472                 if (IS_ENABLED(CONFIG_IPV6) && use_ip6) {
1473                         if (!memcmp(&net_server_ip6, &net_null_addr_ip6,
1474                                     sizeof(struct in6_addr)) &&
1475                                     !strchr(net_boot_file_name, '[')) {
1476                                 puts("*** ERROR: `serverip6' not set\n");
1477                                 return 1;
1478                         }
1479                 } else if (net_server_ip.s_addr == 0 && !is_serverip_in_cmd()) {
1480                         puts("*** ERROR: `serverip' not set\n");
1481                         return 1;
1482                 }
1483 #if     defined(CONFIG_CMD_PING) || \
1484         defined(CONFIG_CMD_DNS) || defined(CONFIG_PROT_UDP)
1485 common:
1486 #endif
1487                 /* Fall through */
1488
1489         case NETCONS:
1490         case FASTBOOT:
1491         case TFTPSRV:
1492                 if (IS_ENABLED(CONFIG_IPV6) && use_ip6) {
1493                         if (!memcmp(&net_link_local_ip6, &net_null_addr_ip6,
1494                                     sizeof(struct in6_addr))) {
1495                                 puts("*** ERROR: `ip6addr` not set\n");
1496                                 return 1;
1497                         }
1498                 } else if (net_ip.s_addr == 0) {
1499                         puts("*** ERROR: `ipaddr' not set\n");
1500                         return 1;
1501                 }
1502                 /* Fall through */
1503
1504 #ifdef CONFIG_CMD_RARP
1505         case RARP:
1506 #endif
1507 #ifdef CONFIG_PHY_NCSI
1508         case NCSI:
1509 #endif
1510         case BOOTP:
1511         case CDP:
1512         case DHCP:
1513         case LINKLOCAL:
1514                 if (memcmp(net_ethaddr, "\0\0\0\0\0\0", 6) == 0) {
1515                         int num = eth_get_dev_index();
1516
1517                         switch (num) {
1518                         case -1:
1519                                 puts("*** ERROR: No ethernet found.\n");
1520                                 return 1;
1521                         case 0:
1522                                 puts("*** ERROR: `ethaddr' not set\n");
1523                                 break;
1524                         default:
1525                                 printf("*** ERROR: `eth%daddr' not set\n",
1526                                        num);
1527                                 break;
1528                         }
1529
1530                         net_start_again();
1531                         return 2;
1532                 }
1533                 /* Fall through */
1534         default:
1535                 return 0;
1536         }
1537         return 0;               /* OK */
1538 }
1539 /**********************************************************************/
1540
1541 int
1542 net_eth_hdr_size(void)
1543 {
1544         ushort myvlanid;
1545
1546         myvlanid = ntohs(net_our_vlan);
1547         if (myvlanid == (ushort)-1)
1548                 myvlanid = VLAN_NONE;
1549
1550         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1551                 VLAN_ETHER_HDR_SIZE;
1552 }
1553
1554 int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot)
1555 {
1556         struct ethernet_hdr *et = (struct ethernet_hdr *)xet;
1557         ushort myvlanid;
1558
1559         myvlanid = ntohs(net_our_vlan);
1560         if (myvlanid == (ushort)-1)
1561                 myvlanid = VLAN_NONE;
1562
1563         memcpy(et->et_dest, dest_ethaddr, 6);
1564         memcpy(et->et_src, net_ethaddr, 6);
1565         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1566                 et->et_protlen = htons(prot);
1567                 return ETHER_HDR_SIZE;
1568         } else {
1569                 struct vlan_ethernet_hdr *vet =
1570                         (struct vlan_ethernet_hdr *)xet;
1571
1572                 vet->vet_vlan_type = htons(PROT_VLAN);
1573                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1574                 vet->vet_type = htons(prot);
1575                 return VLAN_ETHER_HDR_SIZE;
1576         }
1577 }
1578
1579 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
1580 {
1581         ushort protlen;
1582
1583         memcpy(et->et_dest, addr, 6);
1584         memcpy(et->et_src, net_ethaddr, 6);
1585         protlen = ntohs(et->et_protlen);
1586         if (protlen == PROT_VLAN) {
1587                 struct vlan_ethernet_hdr *vet =
1588                         (struct vlan_ethernet_hdr *)et;
1589                 vet->vet_type = htons(prot);
1590                 return VLAN_ETHER_HDR_SIZE;
1591         } else if (protlen > 1514) {
1592                 et->et_protlen = htons(prot);
1593                 return ETHER_HDR_SIZE;
1594         } else {
1595                 /* 802.2 + SNAP */
1596                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1597                 et802->et_prot = htons(prot);
1598                 return E802_HDR_SIZE;
1599         }
1600 }
1601
1602 void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source,
1603                        u16 pkt_len, u8 proto)
1604 {
1605         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1606
1607         /*
1608          *      Construct an IP header.
1609          */
1610         /* IP_HDR_SIZE / 4 (not including UDP) */
1611         ip->ip_hl_v  = 0x45;
1612         ip->ip_tos   = 0;
1613         ip->ip_len   = htons(pkt_len);
1614         ip->ip_p     = proto;
1615         ip->ip_id    = htons(net_ip_id++);
1616         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1617         ip->ip_ttl   = 255;
1618         ip->ip_sum   = 0;
1619         /* already in network byte order */
1620         net_copy_ip((void *)&ip->ip_src, &source);
1621         /* already in network byte order */
1622         net_copy_ip((void *)&ip->ip_dst, &dest);
1623
1624         ip->ip_sum   = compute_ip_checksum(ip, IP_HDR_SIZE);
1625 }
1626
1627 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport,
1628                         int len)
1629 {
1630         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1631
1632         /*
1633          *      If the data is an odd number of bytes, zero the
1634          *      byte after the last byte so that the checksum
1635          *      will work.
1636          */
1637         if (len & 1)
1638                 pkt[IP_UDP_HDR_SIZE + len] = 0;
1639
1640         net_set_ip_header(pkt, dest, net_ip, IP_UDP_HDR_SIZE + len,
1641                           IPPROTO_UDP);
1642
1643         ip->udp_src  = htons(sport);
1644         ip->udp_dst  = htons(dport);
1645         ip->udp_len  = htons(UDP_HDR_SIZE + len);
1646         ip->udp_xsum = 0;
1647 }
1648
1649 void copy_filename(char *dst, const char *src, int size)
1650 {
1651         if (src && *src && (*src == '"')) {
1652                 ++src;
1653                 --size;
1654         }
1655
1656         while ((--size > 0) && src && *src && (*src != '"'))
1657                 *dst++ = *src++;
1658         *dst = '\0';
1659 }
1660
1661 int is_serverip_in_cmd(void)
1662 {
1663         return !!strchr(net_boot_file_name, ':');
1664 }
1665
1666 int net_parse_bootfile(struct in_addr *ipaddr, char *filename, int max_len)
1667 {
1668         char *colon;
1669         struct in_addr ip;
1670         ip.s_addr = 0;
1671
1672         if (net_boot_file_name[0] == '\0')
1673                 return 0;
1674
1675         colon = strchr(net_boot_file_name, ':');
1676         if (colon) {
1677                 ip = string_to_ip(net_boot_file_name);
1678                 if (ipaddr && ip.s_addr)
1679                         *ipaddr = ip;
1680         }
1681         if (ip.s_addr) {
1682                 strncpy(filename, colon + 1, max_len);
1683         } else {
1684                 strncpy(filename, net_boot_file_name, max_len);
1685         }
1686         filename[max_len - 1] = '\0';
1687
1688         return 1;
1689 }
1690
1691 void ip_to_string(struct in_addr x, char *s)
1692 {
1693         x.s_addr = ntohl(x.s_addr);
1694         sprintf(s, "%d.%d.%d.%d",
1695                 (int) ((x.s_addr >> 24) & 0xff),
1696                 (int) ((x.s_addr >> 16) & 0xff),
1697                 (int) ((x.s_addr >> 8) & 0xff),
1698                 (int) ((x.s_addr >> 0) & 0xff)
1699         );
1700 }
1701
1702 void vlan_to_string(ushort x, char *s)
1703 {
1704         x = ntohs(x);
1705
1706         if (x == (ushort)-1)
1707                 x = VLAN_NONE;
1708
1709         if (x == VLAN_NONE)
1710                 strcpy(s, "none");
1711         else
1712                 sprintf(s, "%d", x & VLAN_IDMASK);
1713 }
1714
1715 ushort string_to_vlan(const char *s)
1716 {
1717         ushort id;
1718
1719         if (s == NULL)
1720                 return htons(VLAN_NONE);
1721
1722         if (*s < '0' || *s > '9')
1723                 id = VLAN_NONE;
1724         else
1725                 id = (ushort)dectoul(s, NULL);
1726
1727         return htons(id);
1728 }
1729
1730 ushort env_get_vlan(char *var)
1731 {
1732         return string_to_vlan(env_get(var));
1733 }