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