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