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  * LINKLOCAL:
  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 <bootstage.h>
  85 #include <command.h>
  86 #include <console.h>
  87 #include <env.h>
  88 #include <env_internal.h>
  89 #include <errno.h>
  90 #include <image.h>
  91 #include <log.h>
  92 #include <net.h>
  93 #include <net6.h>
  94 #include <ndisc.h>
  95 #include <net/fastboot_udp.h>
  96 #include <net/fastboot_tcp.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 <test/test.h>
 110 #include <net/tcp.h>
 111 #include <net/wget.h>
 112 #include "arp.h"
 113 #include "bootp.h"
 114 #include "cdp.h"
 115 #if defined(CONFIG_CMD_DNS)
 116 #include "dns.h"
 117 #endif
 118 #include "link_local.h"
 119 #include "nfs.h"
 120 #include "ping.h"
 121 #include "rarp.h"
 122 #if defined(CONFIG_CMD_WOL)
 123 #include "wol.h"
 124 #endif
 125 #include "dhcpv6.h"
 126 #include "net_rand.h"
 127
 128 /** BOOTP EXTENTIONS **/
 129
 130 /* Our subnet mask (0=unknown) */
 131 struct in_addr net_netmask;
 132 /* Our gateways IP address */
 133 struct in_addr net_gateway;
 134 /* Our DNS IP address */
 135 struct in_addr net_dns_server;
 136 #if defined(CONFIG_BOOTP_DNS2)
 137 /* Our 2nd DNS IP address */
 138 struct in_addr net_dns_server2;
 139 #endif
 140 /* Indicates whether the pxe path prefix / config file was specified in dhcp option */
 141 char *pxelinux_configfile;
 142
 143 /** END OF BOOTP EXTENTIONS **/
 144
 145 /* Our ethernet address */
 146 u8 net_ethaddr[6];
 147 /* Boot server enet address */
 148 u8 net_server_ethaddr[6];
 149 /* Our IP addr (0 = unknown) */
 150 struct in_addr  net_ip;
 151 /* Server IP addr (0 = unknown) */
 152 struct in_addr  net_server_ip;
 153 /* Current receive packet */
 154 uchar *net_rx_packet;
 155 /* Current rx packet length */
 156 int             net_rx_packet_len;
 157 /* IP packet ID */
 158 static unsigned net_ip_id;
 159 /* Ethernet bcast address */
 160 const u8 net_bcast_ethaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 161 const u8 net_null_ethaddr[6];
 162 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
 163 void (*push_packet)(void *, int len) = 0;
 164 #endif
 165 /* Network loop state */
 166 enum net_loop_state net_state;
 167 /* Tried all network devices */
 168 int             net_restart_wrap;
 169 /* Network loop restarted */
 170 static int      net_restarted;
 171 /* At least one device configured */
 172 static int      net_dev_exists;
 173
 174 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
 175 /* default is without VLAN */
 176 ushort          net_our_vlan = 0xFFFF;
 177 /* ditto */
 178 ushort          net_native_vlan = 0xFFFF;
 179
 180 /* Boot File name */
 181 char net_boot_file_name[1024];
 182 /* Indicates whether the file name was specified on the command line */
 183 bool net_boot_file_name_explicit;
 184 /* The actual transferred size of the bootfile (in bytes) */
 185 u32 net_boot_file_size;
 186 /* Boot file size in blocks as reported by the DHCP server */
 187 u32 net_boot_file_expected_size_in_blocks;
 188
 189 static uchar net_pkt_buf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 190 /* Receive packets */
 191 uchar *net_rx_packets[PKTBUFSRX];
 192 /* Current UDP RX packet handler */
 193 static rxhand_f *udp_packet_handler;
 194 /* Current ARP RX packet handler */
 195 static rxhand_f *arp_packet_handler;
 196 #ifdef CONFIG_CMD_TFTPPUT
 197 /* Current ICMP rx handler */
 198 static rxhand_icmp_f *packet_icmp_handler;
 199 #endif
 200 /* Current timeout handler */
 201 static thand_f *time_handler;
 202 /* Time base value */
 203 static ulong    time_start;
 204 /* Current timeout value */
 205 static ulong    time_delta;
 206 /* THE transmit packet */
 207 uchar *net_tx_packet;
 208
 209 static int net_check_prereq(enum proto_t protocol);
 210
 211 static int net_try_count;
 212
 213 int __maybe_unused net_busy_flag;
 214
 215 /**********************************************************************/
 216
 217 static int on_ipaddr(const char *name, const char *value, enum env_op op,
 218         int flags)
 219 {
 220         if (flags & H_PROGRAMMATIC)
 221                 return 0;
 222
 223         net_ip = string_to_ip(value);
 224
 225         return 0;
 226 }
 227 U_BOOT_ENV_CALLBACK(ipaddr, on_ipaddr);
 228
 229 static int on_gatewayip(const char *name, const char *value, enum env_op op,
 230         int flags)
 231 {
 232         if (flags & H_PROGRAMMATIC)
 233                 return 0;
 234
 235         net_gateway = string_to_ip(value);
 236
 237         return 0;
 238 }
 239 U_BOOT_ENV_CALLBACK(gatewayip, on_gatewayip);
 240
 241 static int on_netmask(const char *name, const char *value, enum env_op op,
 242         int flags)
 243 {
 244         if (flags & H_PROGRAMMATIC)
 245                 return 0;
 246
 247         net_netmask = string_to_ip(value);
 248
 249         return 0;
 250 }
 251 U_BOOT_ENV_CALLBACK(netmask, on_netmask);
 252
 253 static int on_serverip(const char *name, const char *value, enum env_op op,
 254         int flags)
 255 {
 256         if (flags & H_PROGRAMMATIC)
 257                 return 0;
 258
 259         net_server_ip = string_to_ip(value);
 260
 261         return 0;
 262 }
 263 U_BOOT_ENV_CALLBACK(serverip, on_serverip);
 264
 265 static int on_nvlan(const char *name, const char *value, enum env_op op,
 266         int flags)
 267 {
 268         if (flags & H_PROGRAMMATIC)
 269                 return 0;
 270
 271         net_native_vlan = string_to_vlan(value);
 272
 273         return 0;
 274 }
 275 U_BOOT_ENV_CALLBACK(nvlan, on_nvlan);
 276
 277 static int on_vlan(const char *name, const char *value, enum env_op op,
 278         int flags)
 279 {
 280         if (flags & H_PROGRAMMATIC)
 281                 return 0;
 282
 283         net_our_vlan = string_to_vlan(value);
 284
 285         return 0;
 286 }
 287 U_BOOT_ENV_CALLBACK(vlan, on_vlan);
 288
 289 #if defined(CONFIG_CMD_DNS)
 290 static int on_dnsip(const char *name, const char *value, enum env_op op,
 291         int flags)
 292 {
 293         if (flags & H_PROGRAMMATIC)
 294                 return 0;
 295
 296         net_dns_server = string_to_ip(value);
 297
 298         return 0;
 299 }
 300 U_BOOT_ENV_CALLBACK(dnsip, on_dnsip);
 301 #endif
 302
 303 /*
 304  * Check if autoload is enabled. If so, use either NFS or TFTP to download
 305  * the boot file.
 306  */
 307 void net_auto_load(void)
 308 {
 309 #if defined(CONFIG_CMD_NFS) && !defined(CONFIG_SPL_BUILD)
 310         const char *s = env_get("autoload");
 311
 312         if (s != NULL && strcmp(s, "NFS") == 0) {
 313                 if (net_check_prereq(NFS)) {
 314 /* We aren't expecting to get a serverip, so just accept the assigned IP */
 315                         if (IS_ENABLED(CONFIG_BOOTP_SERVERIP)) {
 316                                 net_set_state(NETLOOP_SUCCESS);
 317                         } else {
 318                                 printf("Cannot autoload with NFS\n");
 319                                 net_set_state(NETLOOP_FAIL);
 320                         }
 321                         return;
 322                 }
 323                 /*
 324                  * Use NFS to load the bootfile.
 325                  */
 326                 nfs_start();
 327                 return;
 328         }
 329 #endif
 330         if (env_get_yesno("autoload") == 0) {
 331                 /*
 332                  * Just use BOOTP/RARP to configure system;
 333                  * Do not use TFTP to load the bootfile.
 334                  */
 335                 net_set_state(NETLOOP_SUCCESS);
 336                 return;
 337         }
 338         if (net_check_prereq(TFTPGET)) {
 339 /* We aren't expecting to get a serverip, so just accept the assigned IP */
 340                 if (IS_ENABLED(CONFIG_BOOTP_SERVERIP)) {
 341                         net_set_state(NETLOOP_SUCCESS);
 342                 } else {
 343                         printf("Cannot autoload with TFTPGET\n");
 344                         net_set_state(NETLOOP_FAIL);
 345                 }
 346                 return;
 347         }
 348         tftp_start(TFTPGET);
 349 }
 350
 351 static int net_init_loop(void)
 352 {
 353         static bool first_call = true;
 354
 355         if (eth_get_dev()) {
 356                 memcpy(net_ethaddr, eth_get_ethaddr(), 6);
 357
 358                 if (IS_ENABLED(CONFIG_IPV6)) {
 359                         ip6_make_lladdr(&net_link_local_ip6, net_ethaddr);
 360                         if (!memcmp(&net_ip6, &net_null_addr_ip6,
 361                                     sizeof(struct in6_addr)))
 362                                 memcpy(&net_ip6, &net_link_local_ip6,
 363                                        sizeof(struct in6_addr));
 364                 }
 365         }
 366         else
 367                 /*
 368                  * Not ideal, but there's no way to get the actual error, and I
 369                  * don't feel like fixing all the users of eth_get_dev to deal
 370                  * with errors.
 371                  */
 372                 return -ENONET;
 373
 374         if (IS_ENABLED(CONFIG_IPV6_ROUTER_DISCOVERY))
 375                 if (first_call && use_ip6) {
 376                         first_call = false;
 377                         srand_mac(); /* This is for rand used in ip6_send_rs. */
 378                         net_loop(RS);
 379                 }
 380         return 0;
 381 }
 382
 383 static void net_clear_handlers(void)
 384 {
 385         net_set_udp_handler(NULL);
 386         net_set_arp_handler(NULL);
 387         net_set_timeout_handler(0, NULL);
 388 }
 389
 390 static void net_cleanup_loop(void)
 391 {
 392         net_clear_handlers();
 393 }
 394
 395 int net_init(void)
 396 {
 397         static int first_call = 1;
 398
 399         if (first_call) {
 400                 /*
 401                  *      Setup packet buffers, aligned correctly.
 402                  */
 403                 int i;
 404
 405                 net_tx_packet = &net_pkt_buf[0] + (PKTALIGN - 1);
 406                 net_tx_packet -= (ulong)net_tx_packet % PKTALIGN;
 407                 for (i = 0; i < PKTBUFSRX; i++) {
 408                         net_rx_packets[i] = net_tx_packet +
 409                                 (i + 1) * PKTSIZE_ALIGN;
 410                 }
 411                 arp_init();
 412                 ndisc_init();
 413                 net_clear_handlers();
 414
 415                 /* Only need to setup buffer pointers once. */
 416                 first_call = 0;
 417                 if (IS_ENABLED(CONFIG_PROT_TCP))
 418                         tcp_set_tcp_state(TCP_CLOSED);
 419         }
 420
 421         return net_init_loop();
 422 }
 423
 424 /**********************************************************************/
 425 /*
 426  *      Main network processing loop.
 427  */
 428
 429 int net_loop(enum proto_t protocol)
 430 {
 431         int ret = -EINVAL;
 432         enum net_loop_state prev_net_state = net_state;
 433
 434 #if defined(CONFIG_CMD_PING)
 435         if (protocol != PING)
 436                 net_ping_ip.s_addr = 0;
 437 #endif
 438         net_restarted = 0;
 439         net_dev_exists = 0;
 440         net_try_count = 1;
 441         debug_cond(DEBUG_INT_STATE, "--- net_loop Entry\n");
 442
 443 #ifdef CONFIG_PHY_NCSI
 444         if (phy_interface_is_ncsi() && protocol != NCSI && !ncsi_active()) {
 445                 printf("%s: configuring NCSI first\n", __func__);
 446                 if (net_loop(NCSI) < 0)
 447                         return ret;
 448                 eth_init_state_only();
 449                 goto restart;
 450         }
 451 #endif
 452
 453         bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
 454         net_init();
 455         if (eth_is_on_demand_init()) {
 456                 eth_halt();
 457                 eth_set_current();
 458                 ret = eth_init();
 459                 if (ret < 0) {
 460                         eth_halt();
 461                         return ret;
 462                 }
 463         } else {
 464                 eth_init_state_only();
 465         }
 466
 467 restart:
 468 #ifdef CONFIG_USB_KEYBOARD
 469         net_busy_flag = 0;
 470 #endif
 471         net_set_state(NETLOOP_CONTINUE);
 472
 473         /*
 474          *      Start the ball rolling with the given start function.  From
 475          *      here on, this code is a state machine driven by received
 476          *      packets and timer events.
 477          */
 478         debug_cond(DEBUG_INT_STATE, "--- net_loop Init\n");
 479         net_init_loop();
 480
 481         if (!test_eth_enabled())
 482                 return 0;
 483
 484         switch (net_check_prereq(protocol)) {
 485         case 1:
 486                 /* network not configured */
 487                 eth_halt();
 488                 net_set_state(prev_net_state);
 489                 return -ENODEV;
 490
 491         case 2:
 492                 /* network device not configured */
 493                 break;
 494
 495         case 0:
 496                 net_dev_exists = 1;
 497                 net_boot_file_size = 0;
 498                 switch (protocol) {
 499 #ifdef CONFIG_CMD_TFTPBOOT
 500                 case TFTPGET:
 501 #ifdef CONFIG_CMD_TFTPPUT
 502                 case TFTPPUT:
 503 #endif
 504                         /* always use ARP to get server ethernet address */
 505                         tftp_start(protocol);
 506                         break;
 507 #endif
 508 #ifdef CONFIG_CMD_TFTPSRV
 509                 case TFTPSRV:
 510                         tftp_start_server();
 511                         break;
 512 #endif
 513 #if CONFIG_IS_ENABLED(UDP_FUNCTION_FASTBOOT)
 514                 case FASTBOOT_UDP:
 515                         fastboot_udp_start_server();
 516                         break;
 517 #endif
 518 #if CONFIG_IS_ENABLED(TCP_FUNCTION_FASTBOOT)
 519                 case FASTBOOT_TCP:
 520                         fastboot_tcp_start_server();
 521                         break;
 522 #endif
 523 #if defined(CONFIG_CMD_DHCP)
 524                 case DHCP:
 525                         bootp_reset();
 526                         net_ip.s_addr = 0;
 527                         dhcp_request();         /* Basically same as BOOTP */
 528                         break;
 529 #endif
 530                 case DHCP6:
 531                         if (IS_ENABLED(CONFIG_CMD_DHCP6))
 532                                 dhcp6_start();
 533                         break;
 534 #if defined(CONFIG_CMD_BOOTP)
 535                 case BOOTP:
 536                         bootp_reset();
 537                         net_ip.s_addr = 0;
 538                         bootp_request();
 539                         break;
 540 #endif
 541 #if defined(CONFIG_CMD_RARP)
 542                 case RARP:
 543                         rarp_try = 0;
 544                         net_ip.s_addr = 0;
 545                         rarp_request();
 546                         break;
 547 #endif
 548 #if defined(CONFIG_CMD_PING)
 549                 case PING:
 550                         ping_start();
 551                         break;
 552 #endif
 553 #if defined(CONFIG_CMD_PING6)
 554                 case PING6:
 555                         ping6_start();
 556                         break;
 557 #endif
 558 #if defined(CONFIG_CMD_NFS) && !defined(CONFIG_SPL_BUILD)
 559                 case NFS:
 560                         nfs_start();
 561                         break;
 562 #endif
 563 #if defined(CONFIG_CMD_WGET)
 564                 case WGET:
 565                         wget_start();
 566                         break;
 567 #endif
 568 #if defined(CONFIG_CMD_CDP)
 569                 case CDP:
 570                         cdp_start();
 571                         break;
 572 #endif
 573 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
 574                 case NETCONS:
 575                         nc_start();
 576                         break;
 577 #endif
 578 #if defined(CONFIG_CMD_DNS)
 579                 case DNS:
 580                         dns_start();
 581                         break;
 582 #endif
 583 #if defined(CONFIG_CMD_LINK_LOCAL)
 584                 case LINKLOCAL:
 585                         link_local_start();
 586                         break;
 587 #endif
 588 #if defined(CONFIG_CMD_WOL)
 589                 case WOL:
 590                         wol_start();
 591                         break;
 592 #endif
 593 #if defined(CONFIG_PHY_NCSI)
 594                 case NCSI:
 595                         ncsi_probe_packages();
 596                         break;
 597 #endif
 598                 case RS:
 599                         if (IS_ENABLED(CONFIG_IPV6_ROUTER_DISCOVERY))
 600                                 ip6_send_rs();
 601                         break;
 602                 default:
 603                         break;
 604                 }
 605
 606                 if (IS_ENABLED(CONFIG_PROT_UDP) && protocol == UDP)
 607                         udp_start();
 608
 609                 break;
 610         }
 611
 612 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 613 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 614         defined(CONFIG_LED_STATUS)                      && \
 615         defined(CONFIG_LED_STATUS_RED)
 616         /*
 617          * Echo the inverted link state to the fault LED.
 618          */
 619         if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
 620                 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_OFF);
 621         else
 622                 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_ON);
 623 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 624 #endif /* CONFIG_MII, ... */
 625 #ifdef CONFIG_USB_KEYBOARD
 626         net_busy_flag = 1;
 627 #endif
 628
 629         /*
 630          *      Main packet reception loop.  Loop receiving packets until
 631          *      someone sets `net_state' to a state that terminates.
 632          */
 633         for (;;) {
 634                 schedule();
 635                 if (arp_timeout_check() > 0)
 636                         time_start = get_timer(0);
 637
 638                 if (IS_ENABLED(CONFIG_IPV6)) {
 639                         if (use_ip6 && (ndisc_timeout_check() > 0))
 640                                 time_start = get_timer(0);
 641                 }
 642
 643                 /*
 644                  *      Check the ethernet for a new packet.  The ethernet
 645                  *      receive routine will process it.
 646                  *      Most drivers return the most recent packet size, but not
 647                  *      errors that may have happened.
 648                  */
 649                 eth_rx();
 650
 651                 /*
 652                  *      Abort if ctrl-c was pressed.
 653                  */
 654                 if (ctrlc()) {
 655                         /* cancel any ARP that may not have completed */
 656                         net_arp_wait_packet_ip.s_addr = 0;
 657
 658                         net_cleanup_loop();
 659                         eth_halt();
 660                         /* Invalidate the last protocol */
 661                         eth_set_last_protocol(BOOTP);
 662
 663                         puts("\nAbort\n");
 664                         /* include a debug print as well incase the debug
 665                            messages are directed to stderr */
 666                         debug_cond(DEBUG_INT_STATE, "--- net_loop Abort!\n");
 667                         ret = -EINTR;
 668                         goto done;
 669                 }
 670
 671                 /*
 672                  *      Check for a timeout, and run the timeout handler
 673                  *      if we have one.
 674                  */
 675                 if (time_handler &&
 676                     ((get_timer(0) - time_start) > time_delta)) {
 677                         thand_f *x;
 678
 679 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 680 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 681         defined(CONFIG_LED_STATUS)                      && \
 682         defined(CONFIG_LED_STATUS_RED)
 683                         /*
 684                          * Echo the inverted link state to the fault LED.
 685                          */
 686                         if (miiphy_link(eth_get_dev()->name,
 687                                         CONFIG_SYS_FAULT_MII_ADDR))
 688                                 status_led_set(CONFIG_LED_STATUS_RED,
 689                                                CONFIG_LED_STATUS_OFF);
 690                         else
 691                                 status_led_set(CONFIG_LED_STATUS_RED,
 692                                                CONFIG_LED_STATUS_ON);
 693 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 694 #endif /* CONFIG_MII, ... */
 695                         debug_cond(DEBUG_INT_STATE, "--- net_loop timeout\n");
 696                         x = time_handler;
 697                         time_handler = (thand_f *)0;
 698                         (*x)();
 699                 } else if (IS_ENABLED(CONFIG_IPV6_ROUTER_DISCOVERY))
 700                         if (time_handler && protocol == RS)
 701                                 if (!ip6_is_unspecified_addr(&net_gateway6) &&
 702                                     net_prefix_length != 0) {
 703                                         net_set_state(NETLOOP_SUCCESS);
 704                                         net_set_timeout_handler(0, NULL);
 705                                 }
 706
 707                 if (net_state == NETLOOP_FAIL)
 708                         ret = net_start_again();
 709
 710                 switch (net_state) {
 711                 case NETLOOP_RESTART:
 712                         net_restarted = 1;
 713                         goto restart;
 714
 715                 case NETLOOP_SUCCESS:
 716                         net_cleanup_loop();
 717                         if (net_boot_file_size > 0) {
 718                                 printf("Bytes transferred = %u (%x hex)\n",
 719                                        net_boot_file_size, net_boot_file_size);
 720                                 env_set_hex("filesize", net_boot_file_size);
 721                                 env_set_hex("fileaddr", image_load_addr);
 722                         }
 723                         if (protocol != NETCONS && protocol != NCSI)
 724                                 eth_halt();
 725                         else
 726                                 eth_halt_state_only();
 727
 728                         eth_set_last_protocol(protocol);
 729
 730                         ret = net_boot_file_size;
 731                         debug_cond(DEBUG_INT_STATE, "--- net_loop Success!\n");
 732                         goto done;
 733
 734                 case NETLOOP_FAIL:
 735                         net_cleanup_loop();
 736                         /* Invalidate the last protocol */
 737                         eth_set_last_protocol(BOOTP);
 738                         debug_cond(DEBUG_INT_STATE, "--- net_loop Fail!\n");
 739                         ret = -ENONET;
 740                         goto done;
 741
 742                 case NETLOOP_CONTINUE:
 743                         continue;
 744                 }
 745         }
 746
 747 done:
 748 #ifdef CONFIG_USB_KEYBOARD
 749         net_busy_flag = 0;
 750 #endif
 751 #ifdef CONFIG_CMD_TFTPPUT
 752         /* Clear out the handlers */
 753         net_set_udp_handler(NULL);
 754         net_set_icmp_handler(NULL);
 755 #endif
 756         net_set_state(prev_net_state);
 757
 758 #if defined(CONFIG_CMD_PCAP)
 759         if (pcap_active())
 760                 pcap_print_status();
 761 #endif
 762         return ret;
 763 }
 764
 765 /**********************************************************************/
 766
 767 static void start_again_timeout_handler(void)
 768 {
 769         net_set_state(NETLOOP_RESTART);
 770 }
 771
 772 int net_start_again(void)
 773 {
 774         char *nretry;
 775         int retry_forever = 0;
 776         unsigned long retrycnt = 0;
 777         int ret;
 778
 779         nretry = env_get("netretry");
 780         if (nretry) {
 781                 if (!strcmp(nretry, "yes"))
 782                         retry_forever = 1;
 783                 else if (!strcmp(nretry, "no"))
 784                         retrycnt = 0;
 785                 else if (!strcmp(nretry, "once"))
 786                         retrycnt = 1;
 787                 else
 788                         retrycnt = simple_strtoul(nretry, NULL, 0);
 789         } else {
 790                 retrycnt = 0;
 791                 retry_forever = 0;
 792         }
 793
 794         if ((!retry_forever) && (net_try_count > retrycnt)) {
 795                 eth_halt();
 796                 net_set_state(NETLOOP_FAIL);
 797                 /*
 798                  * We don't provide a way for the protocol to return an error,
 799                  * but this is almost always the reason.
 800                  */
 801                 return -ETIMEDOUT;
 802         }
 803
 804         net_try_count++;
 805
 806         eth_halt();
 807 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
 808         eth_try_another(!net_restarted);
 809 #endif
 810         ret = eth_init();
 811         if (net_restart_wrap) {
 812                 net_restart_wrap = 0;
 813                 if (net_dev_exists) {
 814                         net_set_timeout_handler(10000UL,
 815                                                 start_again_timeout_handler);
 816                         net_set_udp_handler(NULL);
 817                 } else {
 818                         net_set_state(NETLOOP_FAIL);
 819                 }
 820         } else {
 821                 net_set_state(NETLOOP_RESTART);
 822         }
 823         return ret;
 824 }
 825
 826 /**********************************************************************/
 827 /*
 828  *      Miscelaneous bits.
 829  */
 830
 831 static void dummy_handler(uchar *pkt, unsigned dport,
 832                         struct in_addr sip, unsigned sport,
 833                         unsigned len)
 834 {
 835 }
 836
 837 rxhand_f *net_get_udp_handler(void)
 838 {
 839         return udp_packet_handler;
 840 }
 841
 842 void net_set_udp_handler(rxhand_f *f)
 843 {
 844         debug_cond(DEBUG_INT_STATE, "--- net_loop UDP handler set (%p)\n", f);
 845         if (f == NULL)
 846                 udp_packet_handler = dummy_handler;
 847         else
 848                 udp_packet_handler = f;
 849 }
 850
 851 rxhand_f *net_get_arp_handler(void)
 852 {
 853         return arp_packet_handler;
 854 }
 855
 856 void net_set_arp_handler(rxhand_f *f)
 857 {
 858         debug_cond(DEBUG_INT_STATE, "--- net_loop ARP handler set (%p)\n", f);
 859         if (f == NULL)
 860                 arp_packet_handler = dummy_handler;
 861         else
 862                 arp_packet_handler = f;
 863 }
 864
 865 #ifdef CONFIG_CMD_TFTPPUT
 866 void net_set_icmp_handler(rxhand_icmp_f *f)
 867 {
 868         packet_icmp_handler = f;
 869 }
 870 #endif
 871
 872 void net_set_timeout_handler(ulong iv, thand_f *f)
 873 {
 874         if (iv == 0) {
 875                 debug_cond(DEBUG_INT_STATE,
 876                            "--- net_loop timeout handler cancelled\n");
 877                 time_handler = (thand_f *)0;
 878         } else {
 879                 debug_cond(DEBUG_INT_STATE,
 880                            "--- net_loop timeout handler set (%p)\n", f);
 881                 time_handler = f;
 882                 time_start = get_timer(0);
 883                 time_delta = iv * CONFIG_SYS_HZ / 1000;
 884         }
 885 }
 886
 887 uchar *net_get_async_tx_pkt_buf(void)
 888 {
 889         if (arp_is_waiting())
 890                 return arp_tx_packet; /* If we are waiting, we already sent */
 891         else
 892                 return net_tx_packet;
 893 }
 894
 895 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
 896                 int payload_len)
 897 {
 898         return net_send_ip_packet(ether, dest, dport, sport, payload_len,
 899                                   IPPROTO_UDP, 0, 0, 0);
 900 }
 901
 902 #if defined(CONFIG_PROT_TCP)
 903 int net_send_tcp_packet(int payload_len, int dport, int sport, u8 action,
 904                         u32 tcp_seq_num, u32 tcp_ack_num)
 905 {
 906         return net_send_ip_packet(net_server_ethaddr, net_server_ip, dport,
 907                                   sport, payload_len, IPPROTO_TCP, action,
 908                                   tcp_seq_num, tcp_ack_num);
 909 }
 910 #endif
 911
 912 int net_send_ip_packet(uchar *ether, struct in_addr dest, int dport, int sport,
 913                        int payload_len, int proto, u8 action, u32 tcp_seq_num,
 914                        u32 tcp_ack_num)
 915 {
 916         uchar *pkt;
 917         int eth_hdr_size;
 918         int pkt_hdr_size;
 919
 920         /* make sure the net_tx_packet is initialized (net_init() was called) */
 921         assert(net_tx_packet != NULL);
 922         if (net_tx_packet == NULL)
 923                 return -1;
 924
 925         /* convert to new style broadcast */
 926         if (dest.s_addr == 0)
 927                 dest.s_addr = 0xFFFFFFFF;
 928
 929         /* if broadcast, make the ether address a broadcast and don't do ARP */
 930         if (dest.s_addr == 0xFFFFFFFF)
 931                 ether = (uchar *)net_bcast_ethaddr;
 932
 933         pkt = (uchar *)net_tx_packet;
 934
 935         eth_hdr_size = net_set_ether(pkt, ether, PROT_IP);
 936
 937         switch (proto) {
 938         case IPPROTO_UDP:
 939                 net_set_udp_header(pkt + eth_hdr_size, dest, dport, sport,
 940                                    payload_len);
 941                 pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
 942                 break;
 943 #if defined(CONFIG_PROT_TCP)
 944         case IPPROTO_TCP:
 945                 pkt_hdr_size = eth_hdr_size
 946                         + tcp_set_tcp_header(pkt + eth_hdr_size, dport, sport,
 947                                              payload_len, action, tcp_seq_num,
 948                                              tcp_ack_num);
 949                 break;
 950 #endif
 951         default:
 952                 return -EINVAL;
 953         }
 954
 955         /* if MAC address was not discovered yet, do an ARP request */
 956         if (memcmp(ether, net_null_ethaddr, 6) == 0) {
 957                 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest);
 958
 959                 /* save the ip and eth addr for the packet to send after arp */
 960                 net_arp_wait_packet_ip = dest;
 961                 arp_wait_packet_ethaddr = ether;
 962
 963                 /* size of the waiting packet */
 964                 arp_wait_tx_packet_size = pkt_hdr_size + payload_len;
 965
 966                 /* and do the ARP request */
 967                 arp_wait_try = 1;
 968                 arp_wait_timer_start = get_timer(0);
 969                 arp_request();
 970                 return 1;       /* waiting */
 971         } else {
 972                 debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
 973                            &dest, ether);
 974                 net_send_packet(net_tx_packet, pkt_hdr_size + payload_len);
 975                 return 0;       /* transmitted */
 976         }
 977 }
 978
 979 #ifdef CONFIG_IP_DEFRAG
 980 /*
 981  * This function collects fragments in a single packet, according
 982  * to the algorithm in RFC815. It returns NULL or the pointer to
 983  * a complete packet, in static storage
 984  */
 985 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG)
 986
 987 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE)
 988
 989 /*
 990  * this is the packet being assembled, either data or frag control.
 991  * Fragments go by 8 bytes, so this union must be 8 bytes long
 992  */
 993 struct hole {
 994         /* first_byte is address of this structure */
 995         u16 last_byte;  /* last byte in this hole + 1 (begin of next hole) */
 996         u16 next_hole;  /* index of next (in 8-b blocks), 0 == none */
 997         u16 prev_hole;  /* index of prev, 0 == none */
 998         u16 unused;
 999 };
1000
1001 static struct ip_udp_hdr *__net_defragment(struct ip_udp_hdr *ip, int *lenp)
1002 {
1003         static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
1004         static u16 first_hole, total_len;
1005         struct hole *payload, *thisfrag, *h, *newh;
1006         struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff;
1007         uchar *indata = (uchar *)ip;
1008         int offset8, start, len, done = 0;
1009         u16 ip_off = ntohs(ip->ip_off);
1010
1011         /*
1012          * Calling code already rejected <, but we don't have to deal
1013          * with an IP fragment with no payload.
1014          */
1015         if (ntohs(ip->ip_len) <= IP_HDR_SIZE)
1016                 return NULL;
1017
1018         /* payload starts after IP header, this fragment is in there */
1019         payload = (struct hole *)(pkt_buff + IP_HDR_SIZE);
1020         offset8 =  (ip_off & IP_OFFS);
1021         thisfrag = payload + offset8;
1022         start = offset8 * 8;
1023         len = ntohs(ip->ip_len) - IP_HDR_SIZE;
1024
1025         /* All but last fragment must have a multiple-of-8 payload. */
1026         if ((len & 7) && (ip_off & IP_FLAGS_MFRAG))
1027                 return NULL;
1028
1029         if (start + len > IP_MAXUDP) /* fragment extends too far */
1030                 return NULL;
1031
1032         if (!total_len || localip->ip_id != ip->ip_id) {
1033                 /* new (or different) packet, reset structs */
1034                 total_len = 0xffff;
1035                 payload[0].last_byte = ~0;
1036                 payload[0].next_hole = 0;
1037                 payload[0].prev_hole = 0;
1038                 first_hole = 0;
1039                 /* any IP header will work, copy the first we received */
1040                 memcpy(localip, ip, IP_HDR_SIZE);
1041         }
1042
1043         /*
1044          * What follows is the reassembly algorithm. We use the payload
1045          * array as a linked list of hole descriptors, as each hole starts
1046          * at a multiple of 8 bytes. However, last byte can be whatever value,
1047          * so it is represented as byte count, not as 8-byte blocks.
1048          */
1049
1050         h = payload + first_hole;
1051         while (h->last_byte < start) {
1052                 if (!h->next_hole) {
1053                         /* no hole that far away */
1054                         return NULL;
1055                 }
1056                 h = payload + h->next_hole;
1057         }
1058
1059         /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
1060         if (offset8 + ((len + 7) / 8) <= h - payload) {
1061                 /* no overlap with holes (dup fragment?) */
1062                 return NULL;
1063         }
1064
1065         if (!(ip_off & IP_FLAGS_MFRAG)) {
1066                 /* no more fragmentss: truncate this (last) hole */
1067                 total_len = start + len;
1068                 h->last_byte = start + len;
1069         }
1070
1071         /*
1072          * There is some overlap: fix the hole list. This code deals
1073          * with a fragment that overlaps with two different holes
1074          * (thus being a superset of a previously-received fragment)
1075          * by only using the part of the fragment that fits in the
1076          * first hole.
1077          */
1078         if (h->last_byte < start + len)
1079                 len = h->last_byte - start;
1080
1081         if ((h >= thisfrag) && (h->last_byte <= start + len)) {
1082                 /* complete overlap with hole: remove hole */
1083                 if (!h->prev_hole && !h->next_hole) {
1084                         /* last remaining hole */
1085                         done = 1;
1086                 } else if (!h->prev_hole) {
1087                         /* first hole */
1088                         first_hole = h->next_hole;
1089                         payload[h->next_hole].prev_hole = 0;
1090                 } else if (!h->next_hole) {
1091                         /* last hole */
1092                         payload[h->prev_hole].next_hole = 0;
1093                 } else {
1094                         /* in the middle of the list */
1095                         payload[h->next_hole].prev_hole = h->prev_hole;
1096                         payload[h->prev_hole].next_hole = h->next_hole;
1097                 }
1098
1099         } else if (h->last_byte <= start + len) {
1100                 /* overlaps with final part of the hole: shorten this hole */
1101                 h->last_byte = start;
1102
1103         } else if (h >= thisfrag) {
1104                 /* overlaps with initial part of the hole: move this hole */
1105                 newh = thisfrag + (len / 8);
1106                 *newh = *h;
1107                 h = newh;
1108                 if (h->next_hole)
1109                         payload[h->next_hole].prev_hole = (h - payload);
1110                 if (h->prev_hole)
1111                         payload[h->prev_hole].next_hole = (h - payload);
1112                 else
1113                         first_hole = (h - payload);
1114
1115         } else {
1116                 /* fragment sits in the middle: split the hole */
1117                 newh = thisfrag + (len / 8);
1118                 *newh = *h;
1119                 h->last_byte = start;
1120                 h->next_hole = (newh - payload);
1121                 newh->prev_hole = (h - payload);
1122                 if (newh->next_hole)
1123                         payload[newh->next_hole].prev_hole = (newh - payload);
1124         }
1125
1126         /* finally copy this fragment and possibly return whole packet */
1127         memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len);
1128         if (!done)
1129                 return NULL;
1130
1131         *lenp = total_len + IP_HDR_SIZE;
1132         localip->ip_len = htons(*lenp);
1133         return localip;
1134 }
1135
1136 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
1137         int *lenp)
1138 {
1139         u16 ip_off = ntohs(ip->ip_off);
1140         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1141                 return ip; /* not a fragment */
1142         return __net_defragment(ip, lenp);
1143 }
1144
1145 #else /* !CONFIG_IP_DEFRAG */
1146
1147 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
1148         int *lenp)
1149 {
1150         u16 ip_off = ntohs(ip->ip_off);
1151         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1152                 return ip; /* not a fragment */
1153         return NULL;
1154 }
1155 #endif
1156
1157 /**
1158  * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
1159  * drop others.
1160  *
1161  * @parma ip    IP packet containing the ICMP
1162  */
1163 static void receive_icmp(struct ip_udp_hdr *ip, int len,
1164                         struct in_addr src_ip, struct ethernet_hdr *et)
1165 {
1166         struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
1167
1168         switch (icmph->type) {
1169         case ICMP_REDIRECT:
1170                 if (icmph->code != ICMP_REDIR_HOST)
1171                         return;
1172                 printf(" ICMP Host Redirect to %pI4 ",
1173                        &icmph->un.gateway);
1174                 break;
1175         default:
1176 #if defined(CONFIG_CMD_PING)
1177                 ping_receive(et, ip, len);
1178 #endif
1179 #ifdef CONFIG_CMD_TFTPPUT
1180                 if (packet_icmp_handler)
1181                         packet_icmp_handler(icmph->type, icmph->code,
1182                                             ntohs(ip->udp_dst), src_ip,
1183                                             ntohs(ip->udp_src), icmph->un.data,
1184                                             ntohs(ip->udp_len));
1185 #endif
1186                 break;
1187         }
1188 }
1189
1190 void net_process_received_packet(uchar *in_packet, int len)
1191 {
1192         struct ethernet_hdr *et;
1193         struct ip_udp_hdr *ip;
1194         struct in_addr dst_ip;
1195         struct in_addr src_ip;
1196         int eth_proto;
1197 #if defined(CONFIG_CMD_CDP)
1198         int iscdp;
1199 #endif
1200         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1201
1202         debug_cond(DEBUG_NET_PKT, "packet received\n");
1203         if (DEBUG_NET_PKT_TRACE)
1204                 print_hex_dump_bytes("rx: ", DUMP_PREFIX_OFFSET, in_packet,
1205                                      len);
1206
1207 #if defined(CONFIG_CMD_PCAP)
1208         pcap_post(in_packet, len, false);
1209 #endif
1210         net_rx_packet = in_packet;
1211         net_rx_packet_len = len;
1212         et = (struct ethernet_hdr *)in_packet;
1213
1214         /* too small packet? */
1215         if (len < ETHER_HDR_SIZE)
1216                 return;
1217
1218 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
1219         if (push_packet) {
1220                 (*push_packet)(in_packet, len);
1221                 return;
1222         }
1223 #endif
1224
1225 #if defined(CONFIG_CMD_CDP)
1226         /* keep track if packet is CDP */
1227         iscdp = is_cdp_packet(et->et_dest);
1228 #endif
1229
1230         myvlanid = ntohs(net_our_vlan);
1231         if (myvlanid == (ushort)-1)
1232                 myvlanid = VLAN_NONE;
1233         mynvlanid = ntohs(net_native_vlan);
1234         if (mynvlanid == (ushort)-1)
1235                 mynvlanid = VLAN_NONE;
1236
1237         eth_proto = ntohs(et->et_protlen);
1238
1239         if (eth_proto < 1514) {
1240                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1241                 /*
1242                  *      Got a 802.2 packet.  Check the other protocol field.
1243                  *      XXX VLAN over 802.2+SNAP not implemented!
1244                  */
1245                 eth_proto = ntohs(et802->et_prot);
1246
1247                 ip = (struct ip_udp_hdr *)(in_packet + E802_HDR_SIZE);
1248                 len -= E802_HDR_SIZE;
1249
1250         } else if (eth_proto != PROT_VLAN) {    /* normal packet */
1251                 ip = (struct ip_udp_hdr *)(in_packet + ETHER_HDR_SIZE);
1252                 len -= ETHER_HDR_SIZE;
1253
1254         } else {                        /* VLAN packet */
1255                 struct vlan_ethernet_hdr *vet =
1256                         (struct vlan_ethernet_hdr *)et;
1257
1258                 debug_cond(DEBUG_NET_PKT, "VLAN packet received\n");
1259
1260                 /* too small packet? */
1261                 if (len < VLAN_ETHER_HDR_SIZE)
1262                         return;
1263
1264                 /* if no VLAN active */
1265                 if ((ntohs(net_our_vlan) & VLAN_IDMASK) == VLAN_NONE
1266 #if defined(CONFIG_CMD_CDP)
1267                                 && iscdp == 0
1268 #endif
1269                                 )
1270                         return;
1271
1272                 cti = ntohs(vet->vet_tag);
1273                 vlanid = cti & VLAN_IDMASK;
1274                 eth_proto = ntohs(vet->vet_type);
1275
1276                 ip = (struct ip_udp_hdr *)(in_packet + VLAN_ETHER_HDR_SIZE);
1277                 len -= VLAN_ETHER_HDR_SIZE;
1278         }
1279
1280         debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto);
1281
1282 #if defined(CONFIG_CMD_CDP)
1283         if (iscdp) {
1284                 cdp_receive((uchar *)ip, len);
1285                 return;
1286         }
1287 #endif
1288
1289         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1290                 if (vlanid == VLAN_NONE)
1291                         vlanid = (mynvlanid & VLAN_IDMASK);
1292                 /* not matched? */
1293                 if (vlanid != (myvlanid & VLAN_IDMASK))
1294                         return;
1295         }
1296
1297         switch (eth_proto) {
1298         case PROT_ARP:
1299                 arp_receive(et, ip, len);
1300                 break;
1301
1302 #ifdef CONFIG_CMD_RARP
1303         case PROT_RARP:
1304                 rarp_receive(ip, len);
1305                 break;
1306 #endif
1307 #if IS_ENABLED(CONFIG_IPV6)
1308         case PROT_IP6:
1309                 net_ip6_handler(et, (struct ip6_hdr *)ip, len);
1310                 break;
1311 #endif
1312         case PROT_IP:
1313                 debug_cond(DEBUG_NET_PKT, "Got IP\n");
1314                 /* Before we start poking the header, make sure it is there */
1315                 if (len < IP_HDR_SIZE) {
1316                         debug("len bad %d < %lu\n", len,
1317                               (ulong)IP_HDR_SIZE);
1318                         return;
1319                 }
1320                 /* Check the packet length */
1321                 if (len < ntohs(ip->ip_len)) {
1322                         debug("len bad %d < %d\n", len, ntohs(ip->ip_len));
1323                         return;
1324                 }
1325                 len = ntohs(ip->ip_len);
1326                 if (len < IP_HDR_SIZE) {
1327                         debug("bad ip->ip_len %d < %d\n", len, (int)IP_HDR_SIZE);
1328                         return;
1329                 }
1330                 debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n",
1331                            len, ip->ip_hl_v & 0xff);
1332
1333                 /* Can't deal with anything except IPv4 */
1334                 if ((ip->ip_hl_v & 0xf0) != 0x40)
1335                         return;
1336                 /* Can't deal with IP options (headers != 20 bytes) */
1337                 if ((ip->ip_hl_v & 0x0f) != 0x05)
1338                         return;
1339                 /* Check the Checksum of the header */
1340                 if (!ip_checksum_ok((uchar *)ip, IP_HDR_SIZE)) {
1341                         debug("checksum bad\n");
1342                         return;
1343                 }
1344                 /* If it is not for us, ignore it */
1345                 dst_ip = net_read_ip(&ip->ip_dst);
1346                 if (net_ip.s_addr && dst_ip.s_addr != net_ip.s_addr &&
1347                     dst_ip.s_addr != 0xFFFFFFFF) {
1348                                 return;
1349                 }
1350                 /* Read source IP address for later use */
1351                 src_ip = net_read_ip(&ip->ip_src);
1352                 /*
1353                  * The function returns the unchanged packet if it's not
1354                  * a fragment, and either the complete packet or NULL if
1355                  * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1356                  */
1357                 ip = net_defragment(ip, &len);
1358                 if (!ip)
1359                         return;
1360                 /*
1361                  * watch for ICMP host redirects
1362                  *
1363                  * There is no real handler code (yet). We just watch
1364                  * for ICMP host redirect messages. In case anybody
1365                  * sees these messages: please contact me
1366                  * ([email protected]), or - even better - send me the
1367                  * necessary fixes :-)
1368                  *
1369                  * Note: in all cases where I have seen this so far
1370                  * it was a problem with the router configuration,
1371                  * for instance when a router was configured in the
1372                  * BOOTP reply, but the TFTP server was on the same
1373                  * subnet. So this is probably a warning that your
1374                  * configuration might be wrong. But I'm not really
1375                  * sure if there aren't any other situations.
1376                  *
1377                  * Simon Glass <[email protected]>: We get an ICMP when
1378                  * we send a tftp packet to a dead connection, or when
1379                  * there is no server at the other end.
1380                  */
1381                 if (ip->ip_p == IPPROTO_ICMP) {
1382                         receive_icmp(ip, len, src_ip, et);
1383                         return;
1384 #if defined(CONFIG_PROT_TCP)
1385                 } else if (ip->ip_p == IPPROTO_TCP) {
1386                         debug_cond(DEBUG_DEV_PKT,
1387                                    "TCP PH (to=%pI4, from=%pI4, len=%d)\n",
1388                                    &dst_ip, &src_ip, len);
1389
1390                         rxhand_tcp_f((union tcp_build_pkt *)ip, len);
1391                         return;
1392 #endif
1393                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1394                         return;
1395                 }
1396
1397                 if (ntohs(ip->udp_len) < UDP_HDR_SIZE || ntohs(ip->udp_len) > len - IP_HDR_SIZE)
1398                         return;
1399
1400                 debug_cond(DEBUG_DEV_PKT,
1401                            "received UDP (to=%pI4, from=%pI4, len=%d)\n",
1402                            &dst_ip, &src_ip, len);
1403
1404                 if (IS_ENABLED(CONFIG_UDP_CHECKSUM) && ip->udp_xsum != 0) {
1405                         ulong   xsum;
1406                         u8 *sumptr;
1407                         ushort  sumlen;
1408
1409                         xsum  = ip->ip_p;
1410                         xsum += (ntohs(ip->udp_len));
1411                         xsum += (ntohl(ip->ip_src.s_addr) >> 16) & 0x0000ffff;
1412                         xsum += (ntohl(ip->ip_src.s_addr) >>  0) & 0x0000ffff;
1413                         xsum += (ntohl(ip->ip_dst.s_addr) >> 16) & 0x0000ffff;
1414                         xsum += (ntohl(ip->ip_dst.s_addr) >>  0) & 0x0000ffff;
1415
1416                         sumlen = ntohs(ip->udp_len);
1417                         sumptr = (u8 *)&ip->udp_src;
1418
1419                         while (sumlen > 1) {
1420                                 /* inlined ntohs() to avoid alignment errors */
1421                                 xsum += (sumptr[0] << 8) + sumptr[1];
1422                                 sumptr += 2;
1423                                 sumlen -= 2;
1424                         }
1425                         if (sumlen > 0)
1426                                 xsum += (sumptr[0] << 8) + sumptr[0];
1427                         while ((xsum >> 16) != 0) {
1428                                 xsum = (xsum & 0x0000ffff) +
1429                                        ((xsum >> 16) & 0x0000ffff);
1430                         }
1431                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1432                                 printf(" UDP wrong checksum %08lx %08x\n",
1433                                        xsum, ntohs(ip->udp_xsum));
1434                                 return;
1435                         }
1436                 }
1437
1438 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
1439                 nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
1440                                 src_ip,
1441                                 ntohs(ip->udp_dst),
1442                                 ntohs(ip->udp_src),
1443                                 ntohs(ip->udp_len) - UDP_HDR_SIZE);
1444 #endif
1445                 /*
1446                  * IP header OK.  Pass the packet to the current handler.
1447                  */
1448                 (*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE,
1449                                       ntohs(ip->udp_dst),
1450                                       src_ip,
1451                                       ntohs(ip->udp_src),
1452                                       ntohs(ip->udp_len) - UDP_HDR_SIZE);
1453                 break;
1454 #ifdef CONFIG_CMD_WOL
1455         case PROT_WOL:
1456                 wol_receive(ip, len);
1457                 break;
1458 #endif
1459 #ifdef CONFIG_PHY_NCSI
1460         case PROT_NCSI:
1461                 ncsi_receive(et, ip, len);
1462                 break;
1463 #endif
1464         }
1465 }
1466
1467 /**********************************************************************/
1468
1469 static int net_check_prereq(enum proto_t protocol)
1470 {
1471         switch (protocol) {
1472                 /* Fall through */
1473 #if defined(CONFIG_CMD_PING)
1474         case PING:
1475                 if (net_ping_ip.s_addr == 0) {
1476                         puts("*** ERROR: ping address not given\n");
1477                         return 1;
1478                 }
1479                 goto common;
1480 #endif
1481 #if defined(CONFIG_CMD_PING6)
1482         case PING6:
1483                 if (ip6_is_unspecified_addr(&net_ping_ip6)) {
1484                         puts("*** ERROR: ping address not given\n");
1485                         return 1;
1486                 }
1487                 goto common;
1488 #endif
1489 #if defined(CONFIG_CMD_DNS)
1490         case DNS:
1491                 if (net_dns_server.s_addr == 0) {
1492                         puts("*** ERROR: DNS server address not given\n");
1493                         return 1;
1494                 }
1495                 goto common;
1496 #endif
1497 #if defined(CONFIG_PROT_UDP)
1498         case UDP:
1499                 if (udp_prereq())
1500                         return 1;
1501                 goto common;
1502 #endif
1503
1504 #if defined(CONFIG_CMD_NFS)
1505         case NFS:
1506 #endif
1507                 /* Fall through */
1508         case TFTPGET:
1509         case TFTPPUT:
1510                 if (IS_ENABLED(CONFIG_IPV6) && use_ip6) {
1511                         if (!memcmp(&net_server_ip6, &net_null_addr_ip6,
1512                                     sizeof(struct in6_addr)) &&
1513                                     !strchr(net_boot_file_name, '[')) {
1514                                 puts("*** ERROR: `serverip6' not set\n");
1515                                 return 1;
1516                         }
1517                 } else if (net_server_ip.s_addr == 0 && !is_serverip_in_cmd()) {
1518                         puts("*** ERROR: `serverip' not set\n");
1519                         return 1;
1520                 }
1521 #if     defined(CONFIG_CMD_PING) || \
1522         defined(CONFIG_CMD_DNS) || defined(CONFIG_PROT_UDP)
1523 common:
1524 #endif
1525                 /* Fall through */
1526
1527         case NETCONS:
1528         case FASTBOOT_UDP:
1529         case FASTBOOT_TCP:
1530         case TFTPSRV:
1531                 if (IS_ENABLED(CONFIG_IPV6) && use_ip6) {
1532                         if (!memcmp(&net_link_local_ip6, &net_null_addr_ip6,
1533                                     sizeof(struct in6_addr))) {
1534                                 puts("*** ERROR: `ip6addr` not set\n");
1535                                 return 1;
1536                         }
1537                 } else if (net_ip.s_addr == 0) {
1538                         puts("*** ERROR: `ipaddr' not set\n");
1539                         return 1;
1540                 }
1541                 /* Fall through */
1542
1543 #ifdef CONFIG_CMD_RARP
1544         case RARP:
1545 #endif
1546 #ifdef CONFIG_PHY_NCSI
1547         case NCSI:
1548 #endif
1549         case BOOTP:
1550         case CDP:
1551         case DHCP:
1552         case LINKLOCAL:
1553                 if (memcmp(net_ethaddr, "\0\0\0\0\0\0", 6) == 0) {
1554                         int num = eth_get_dev_index();
1555
1556                         switch (num) {
1557                         case -1:
1558                                 puts("*** ERROR: No ethernet found.\n");
1559                                 return 1;
1560                         case 0:
1561                                 puts("*** ERROR: `ethaddr' not set\n");
1562                                 break;
1563                         default:
1564                                 printf("*** ERROR: `eth%daddr' not set\n",
1565                                        num);
1566                                 break;
1567                         }
1568
1569                         net_start_again();
1570                         return 2;
1571                 }
1572                 /* Fall through */
1573         default:
1574                 return 0;
1575         }
1576         return 0;               /* OK */
1577 }
1578 /**********************************************************************/
1579
1580 int
1581 net_eth_hdr_size(void)
1582 {
1583         ushort myvlanid;
1584
1585         myvlanid = ntohs(net_our_vlan);
1586         if (myvlanid == (ushort)-1)
1587                 myvlanid = VLAN_NONE;
1588
1589         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1590                 VLAN_ETHER_HDR_SIZE;
1591 }
1592
1593 int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot)
1594 {
1595         struct ethernet_hdr *et = (struct ethernet_hdr *)xet;
1596         ushort myvlanid;
1597
1598         myvlanid = ntohs(net_our_vlan);
1599         if (myvlanid == (ushort)-1)
1600                 myvlanid = VLAN_NONE;
1601
1602         memcpy(et->et_dest, dest_ethaddr, 6);
1603         memcpy(et->et_src, net_ethaddr, 6);
1604         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1605                 et->et_protlen = htons(prot);
1606                 return ETHER_HDR_SIZE;
1607         } else {
1608                 struct vlan_ethernet_hdr *vet =
1609                         (struct vlan_ethernet_hdr *)xet;
1610
1611                 vet->vet_vlan_type = htons(PROT_VLAN);
1612                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1613                 vet->vet_type = htons(prot);
1614                 return VLAN_ETHER_HDR_SIZE;
1615         }
1616 }
1617
1618 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
1619 {
1620         ushort protlen;
1621
1622         memcpy(et->et_dest, addr, 6);
1623         memcpy(et->et_src, net_ethaddr, 6);
1624         protlen = ntohs(et->et_protlen);
1625         if (protlen == PROT_VLAN) {
1626                 struct vlan_ethernet_hdr *vet =
1627                         (struct vlan_ethernet_hdr *)et;
1628                 vet->vet_type = htons(prot);
1629                 return VLAN_ETHER_HDR_SIZE;
1630         } else if (protlen > 1514) {
1631                 et->et_protlen = htons(prot);
1632                 return ETHER_HDR_SIZE;
1633         } else {
1634                 /* 802.2 + SNAP */
1635                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1636                 et802->et_prot = htons(prot);
1637                 return E802_HDR_SIZE;
1638         }
1639 }
1640
1641 void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source,
1642                        u16 pkt_len, u8 proto)
1643 {
1644         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1645
1646         /*
1647          *      Construct an IP header.
1648          */
1649         /* IP_HDR_SIZE / 4 (not including UDP) */
1650         ip->ip_hl_v  = 0x45;
1651         ip->ip_tos   = 0;
1652         ip->ip_len   = htons(pkt_len);
1653         ip->ip_p     = proto;
1654         ip->ip_id    = htons(net_ip_id++);
1655         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1656         ip->ip_ttl   = 255;
1657         ip->ip_sum   = 0;
1658         /* already in network byte order */
1659         net_copy_ip((void *)&ip->ip_src, &source);
1660         /* already in network byte order */
1661         net_copy_ip((void *)&ip->ip_dst, &dest);
1662
1663         ip->ip_sum   = compute_ip_checksum(ip, IP_HDR_SIZE);
1664 }
1665
1666 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport,
1667                         int len)
1668 {
1669         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1670
1671         /*
1672          *      If the data is an odd number of bytes, zero the
1673          *      byte after the last byte so that the checksum
1674          *      will work.
1675          */
1676         if (len & 1)
1677                 pkt[IP_UDP_HDR_SIZE + len] = 0;
1678
1679         net_set_ip_header(pkt, dest, net_ip, IP_UDP_HDR_SIZE + len,
1680                           IPPROTO_UDP);
1681
1682         ip->udp_src  = htons(sport);
1683         ip->udp_dst  = htons(dport);
1684         ip->udp_len  = htons(UDP_HDR_SIZE + len);
1685         ip->udp_xsum = 0;
1686 }
1687
1688 void copy_filename(char *dst, const char *src, int size)
1689 {
1690         if (src && *src && (*src == '"')) {
1691                 ++src;
1692                 --size;
1693         }
1694
1695         while ((--size > 0) && src && *src && (*src != '"'))
1696                 *dst++ = *src++;
1697         *dst = '\0';
1698 }
1699
1700 int is_serverip_in_cmd(void)
1701 {
1702         return !!strchr(net_boot_file_name, ':');
1703 }
1704
1705 int net_parse_bootfile(struct in_addr *ipaddr, char *filename, int max_len)
1706 {
1707         char *colon;
1708         struct in_addr ip;
1709         ip.s_addr = 0;
1710
1711         if (net_boot_file_name[0] == '\0')
1712                 return 0;
1713
1714         colon = strchr(net_boot_file_name, ':');
1715         if (colon) {
1716                 ip = string_to_ip(net_boot_file_name);
1717                 if (ipaddr && ip.s_addr)
1718                         *ipaddr = ip;
1719         }
1720         if (ip.s_addr) {
1721                 strncpy(filename, colon + 1, max_len);
1722         } else {
1723                 strncpy(filename, net_boot_file_name, max_len);
1724         }
1725         filename[max_len - 1] = '\0';
1726
1727         return 1;
1728 }
1729
1730 void ip_to_string(struct in_addr x, char *s)
1731 {
1732         x.s_addr = ntohl(x.s_addr);
1733         sprintf(s, "%d.%d.%d.%d",
1734                 (int) ((x.s_addr >> 24) & 0xff),
1735                 (int) ((x.s_addr >> 16) & 0xff),
1736                 (int) ((x.s_addr >> 8) & 0xff),
1737                 (int) ((x.s_addr >> 0) & 0xff)
1738         );
1739 }
1740
1741 void vlan_to_string(ushort x, char *s)
1742 {
1743         x = ntohs(x);
1744
1745         if (x == (ushort)-1)
1746                 x = VLAN_NONE;
1747
1748         if (x == VLAN_NONE)
1749                 strcpy(s, "none");
1750         else
1751                 sprintf(s, "%d", x & VLAN_IDMASK);
1752 }
1753
1754 ushort string_to_vlan(const char *s)
1755 {
1756         ushort id;
1757
1758         if (s == NULL)
1759                 return htons(VLAN_NONE);
1760
1761         if (*s < '0' || *s > '9')
1762                 id = VLAN_NONE;
1763         else
1764                 id = (ushort)dectoul(s, NULL);
1765
1766         return htons(id);
1767 }
1768
1769 ushort env_get_vlan(char *var)
1770 {
1771         return string_to_vlan(env_get(var));
1772 }