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 <log.h>
  91 #include <net.h>
  92 #include <net6.h>
  93 #include <ndisc.h>
  94 #include <net/fastboot_udp.h>
  95 #include <net/fastboot_tcp.h>
  96 #include <net/tftp.h>
  97 #include <net/ncsi.h>
  98 #if defined(CONFIG_CMD_PCAP)
  99 #include <net/pcap.h>
 100 #endif
 101 #include <net/udp.h>
 102 #if defined(CONFIG_LED_STATUS)
 103 #include <miiphy.h>
 104 #include <status_led.h>
 105 #endif
 106 #include <watchdog.h>
 107 #include <linux/compiler.h>
 108 #include <test/test.h>
 109 #include <net/tcp.h>
 110 #include <net/wget.h>
 111 #include "arp.h"
 112 #include "bootp.h"
 113 #include "cdp.h"
 114 #if defined(CONFIG_CMD_DNS)
 115 #include "dns.h"
 116 #endif
 117 #include "link_local.h"
 118 #include "nfs.h"
 119 #include "ping.h"
 120 #include "rarp.h"
 121 #if defined(CONFIG_CMD_WOL)
 122 #include "wol.h"
 123 #endif
 124 #include "dhcpv6.h"
 125 #include "net_rand.h"
 126
 127 /** BOOTP EXTENTIONS **/
 128
 129 /* Our subnet mask (0=unknown) */
 130 struct in_addr net_netmask;
 131 /* Our gateways IP address */
 132 struct in_addr net_gateway;
 133 /* Our DNS IP address */
 134 struct in_addr net_dns_server;
 135 #if defined(CONFIG_BOOTP_DNS2)
 136 /* Our 2nd DNS IP address */
 137 struct in_addr net_dns_server2;
 138 #endif
 139 /* Indicates whether the pxe path prefix / config file was specified in dhcp option */
 140 char *pxelinux_configfile;
 141
 142 /** END OF BOOTP EXTENTIONS **/
 143
 144 /* Our ethernet address */
 145 u8 net_ethaddr[6];
 146 /* Boot server enet address */
 147 u8 net_server_ethaddr[6];
 148 /* Our IP addr (0 = unknown) */
 149 struct in_addr  net_ip;
 150 /* Server IP addr (0 = unknown) */
 151 struct in_addr  net_server_ip;
 152 /* Current receive packet */
 153 uchar *net_rx_packet;
 154 /* Current rx packet length */
 155 int             net_rx_packet_len;
 156 /* IP packet ID */
 157 static unsigned net_ip_id;
 158 /* Ethernet bcast address */
 159 const u8 net_bcast_ethaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 160 const u8 net_null_ethaddr[6];
 161 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
 162 void (*push_packet)(void *, int len) = 0;
 163 #endif
 164 /* Network loop state */
 165 enum net_loop_state net_state;
 166 /* Tried all network devices */
 167 int             net_restart_wrap;
 168 /* Network loop restarted */
 169 static int      net_restarted;
 170 /* At least one device configured */
 171 static int      net_dev_exists;
 172
 173 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
 174 /* default is without VLAN */
 175 ushort          net_our_vlan = 0xFFFF;
 176 /* ditto */
 177 ushort          net_native_vlan = 0xFFFF;
 178
 179 /* Boot File name */
 180 char net_boot_file_name[1024];
 181 /* Indicates whether the file name was specified on the command line */
 182 bool net_boot_file_name_explicit;
 183 /* The actual transferred size of the bootfile (in bytes) */
 184 u32 net_boot_file_size;
 185 /* Boot file size in blocks as reported by the DHCP server */
 186 u32 net_boot_file_expected_size_in_blocks;
 187
 188 static uchar net_pkt_buf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 189 /* Receive packets */
 190 uchar *net_rx_packets[PKTBUFSRX];
 191 /* Current UDP RX packet handler */
 192 static rxhand_f *udp_packet_handler;
 193 /* Current ARP RX packet handler */
 194 static rxhand_f *arp_packet_handler;
 195 #ifdef CONFIG_CMD_TFTPPUT
 196 /* Current ICMP rx handler */
 197 static rxhand_icmp_f *packet_icmp_handler;
 198 #endif
 199 /* Current timeout handler */
 200 static thand_f *time_handler;
 201 /* Time base value */
 202 static ulong    time_start;
 203 /* Current timeout value */
 204 static ulong    time_delta;
 205 /* THE transmit packet */
 206 uchar *net_tx_packet;
 207
 208 static int net_check_prereq(enum proto_t protocol);
 209
 210 static int net_try_count;
 211
 212 int __maybe_unused net_busy_flag;
 213
 214 /**********************************************************************/
 215
 216 static int on_ipaddr(const char *name, const char *value, enum env_op op,
 217         int flags)
 218 {
 219         if (flags & H_PROGRAMMATIC)
 220                 return 0;
 221
 222         net_ip = string_to_ip(value);
 223
 224         return 0;
 225 }
 226 U_BOOT_ENV_CALLBACK(ipaddr, on_ipaddr);
 227
 228 static int on_gatewayip(const char *name, const char *value, enum env_op op,
 229         int flags)
 230 {
 231         if (flags & H_PROGRAMMATIC)
 232                 return 0;
 233
 234         net_gateway = string_to_ip(value);
 235
 236         return 0;
 237 }
 238 U_BOOT_ENV_CALLBACK(gatewayip, on_gatewayip);
 239
 240 static int on_netmask(const char *name, const char *value, enum env_op op,
 241         int flags)
 242 {
 243         if (flags & H_PROGRAMMATIC)
 244                 return 0;
 245
 246         net_netmask = string_to_ip(value);
 247
 248         return 0;
 249 }
 250 U_BOOT_ENV_CALLBACK(netmask, on_netmask);
 251
 252 static int on_serverip(const char *name, const char *value, enum env_op op,
 253         int flags)
 254 {
 255         if (flags & H_PROGRAMMATIC)
 256                 return 0;
 257
 258         net_server_ip = string_to_ip(value);
 259
 260         return 0;
 261 }
 262 U_BOOT_ENV_CALLBACK(serverip, on_serverip);
 263
 264 static int on_nvlan(const char *name, const char *value, enum env_op op,
 265         int flags)
 266 {
 267         if (flags & H_PROGRAMMATIC)
 268                 return 0;
 269
 270         net_native_vlan = string_to_vlan(value);
 271
 272         return 0;
 273 }
 274 U_BOOT_ENV_CALLBACK(nvlan, on_nvlan);
 275
 276 static int on_vlan(const char *name, const char *value, enum env_op op,
 277         int flags)
 278 {
 279         if (flags & H_PROGRAMMATIC)
 280                 return 0;
 281
 282         net_our_vlan = string_to_vlan(value);
 283
 284         return 0;
 285 }
 286 U_BOOT_ENV_CALLBACK(vlan, on_vlan);
 287
 288 #if defined(CONFIG_CMD_DNS)
 289 static int on_dnsip(const char *name, const char *value, enum env_op op,
 290         int flags)
 291 {
 292         if (flags & H_PROGRAMMATIC)
 293                 return 0;
 294
 295         net_dns_server = string_to_ip(value);
 296
 297         return 0;
 298 }
 299 U_BOOT_ENV_CALLBACK(dnsip, on_dnsip);
 300 #endif
 301
 302 /*
 303  * Check if autoload is enabled. If so, use either NFS or TFTP to download
 304  * the boot file.
 305  */
 306 void net_auto_load(void)
 307 {
 308 #if defined(CONFIG_CMD_NFS) && !defined(CONFIG_SPL_BUILD)
 309         const char *s = env_get("autoload");
 310
 311         if (s != NULL && strcmp(s, "NFS") == 0) {
 312                 if (net_check_prereq(NFS)) {
 313 /* We aren't expecting to get a serverip, so just accept the assigned IP */
 314                         if (IS_ENABLED(CONFIG_BOOTP_SERVERIP)) {
 315                                 net_set_state(NETLOOP_SUCCESS);
 316                         } else {
 317                                 printf("Cannot autoload with NFS\n");
 318                                 net_set_state(NETLOOP_FAIL);
 319                         }
 320                         return;
 321                 }
 322                 /*
 323                  * Use NFS to load the bootfile.
 324                  */
 325                 nfs_start();
 326                 return;
 327         }
 328 #endif
 329         if (env_get_yesno("autoload") == 0) {
 330                 /*
 331                  * Just use BOOTP/RARP to configure system;
 332                  * Do not use TFTP to load the bootfile.
 333                  */
 334                 net_set_state(NETLOOP_SUCCESS);
 335                 return;
 336         }
 337         if (IS_ENABLED(CONFIG_CMD_TFTPBOOT)) {
 338                 if (net_check_prereq(TFTPGET)) {
 339                         /*
 340                          * We aren't expecting to get a serverip, so just
 341                          * accept the assigned IP
 342                          */
 343                         if (IS_ENABLED(CONFIG_BOOTP_SERVERIP)) {
 344                                 net_set_state(NETLOOP_SUCCESS);
 345                         } else {
 346                                 printf("Cannot autoload with TFTPGET\n");
 347                                 net_set_state(NETLOOP_FAIL);
 348                         }
 349                         return;
 350                 }
 351                 tftp_start(TFTPGET);
 352         }
 353 }
 354
 355 static int net_init_loop(void)
 356 {
 357         static bool first_call = true;
 358
 359         if (eth_get_dev()) {
 360                 memcpy(net_ethaddr, eth_get_ethaddr(), 6);
 361
 362                 if (IS_ENABLED(CONFIG_IPV6)) {
 363                         ip6_make_lladdr(&net_link_local_ip6, net_ethaddr);
 364                         if (!memcmp(&net_ip6, &net_null_addr_ip6,
 365                                     sizeof(struct in6_addr)))
 366                                 memcpy(&net_ip6, &net_link_local_ip6,
 367                                        sizeof(struct in6_addr));
 368                 }
 369         }
 370         else
 371                 /*
 372                  * Not ideal, but there's no way to get the actual error, and I
 373                  * don't feel like fixing all the users of eth_get_dev to deal
 374                  * with errors.
 375                  */
 376                 return -ENONET;
 377
 378         if (IS_ENABLED(CONFIG_IPV6_ROUTER_DISCOVERY))
 379                 if (first_call && use_ip6) {
 380                         first_call = false;
 381                         srand_mac(); /* This is for rand used in ip6_send_rs. */
 382                         net_loop(RS);
 383                 }
 384         return 0;
 385 }
 386
 387 static void net_clear_handlers(void)
 388 {
 389         net_set_udp_handler(NULL);
 390         net_set_arp_handler(NULL);
 391         net_set_timeout_handler(0, NULL);
 392 }
 393
 394 static void net_cleanup_loop(void)
 395 {
 396         net_clear_handlers();
 397 }
 398
 399 int net_init(void)
 400 {
 401         static int first_call = 1;
 402
 403         if (first_call) {
 404                 /*
 405                  *      Setup packet buffers, aligned correctly.
 406                  */
 407                 int i;
 408
 409                 net_tx_packet = &net_pkt_buf[0] + (PKTALIGN - 1);
 410                 net_tx_packet -= (ulong)net_tx_packet % PKTALIGN;
 411                 for (i = 0; i < PKTBUFSRX; i++) {
 412                         net_rx_packets[i] = net_tx_packet +
 413                                 (i + 1) * PKTSIZE_ALIGN;
 414                 }
 415                 arp_init();
 416                 ndisc_init();
 417                 net_clear_handlers();
 418
 419                 /* Only need to setup buffer pointers once. */
 420                 first_call = 0;
 421                 if (IS_ENABLED(CONFIG_PROT_TCP))
 422                         tcp_set_tcp_state(TCP_CLOSED);
 423         }
 424
 425         return net_init_loop();
 426 }
 427
 428 /**********************************************************************/
 429 /*
 430  *      Main network processing loop.
 431  */
 432
 433 int net_loop(enum proto_t protocol)
 434 {
 435         int ret = -EINVAL;
 436         enum net_loop_state prev_net_state = net_state;
 437
 438 #if defined(CONFIG_CMD_PING)
 439         if (protocol != PING)
 440                 net_ping_ip.s_addr = 0;
 441 #endif
 442         net_restarted = 0;
 443         net_dev_exists = 0;
 444         net_try_count = 1;
 445         debug_cond(DEBUG_INT_STATE, "--- net_loop Entry\n");
 446
 447 #ifdef CONFIG_PHY_NCSI
 448         if (phy_interface_is_ncsi() && protocol != NCSI && !ncsi_active()) {
 449                 printf("%s: configuring NCSI first\n", __func__);
 450                 if (net_loop(NCSI) < 0)
 451                         return ret;
 452                 eth_init_state_only();
 453                 goto restart;
 454         }
 455 #endif
 456
 457         bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
 458         net_init();
 459         if (eth_is_on_demand_init()) {
 460                 eth_halt();
 461                 eth_set_current();
 462                 ret = eth_init();
 463                 if (ret < 0) {
 464                         eth_halt();
 465                         return ret;
 466                 }
 467         } else {
 468                 eth_init_state_only();
 469         }
 470
 471 restart:
 472 #ifdef CONFIG_USB_KEYBOARD
 473         net_busy_flag = 0;
 474 #endif
 475         net_set_state(NETLOOP_CONTINUE);
 476
 477         /*
 478          *      Start the ball rolling with the given start function.  From
 479          *      here on, this code is a state machine driven by received
 480          *      packets and timer events.
 481          */
 482         debug_cond(DEBUG_INT_STATE, "--- net_loop Init\n");
 483         net_init_loop();
 484
 485         if (!test_eth_enabled())
 486                 return 0;
 487
 488         switch (net_check_prereq(protocol)) {
 489         case 1:
 490                 /* network not configured */
 491                 eth_halt();
 492                 net_set_state(prev_net_state);
 493                 return -ENODEV;
 494
 495         case 2:
 496                 /* network device not configured */
 497                 break;
 498
 499         case 0:
 500                 net_dev_exists = 1;
 501                 net_boot_file_size = 0;
 502                 switch (protocol) {
 503 #ifdef CONFIG_CMD_TFTPBOOT
 504                 case TFTPGET:
 505 #ifdef CONFIG_CMD_TFTPPUT
 506                 case TFTPPUT:
 507 #endif
 508                         /* always use ARP to get server ethernet address */
 509                         tftp_start(protocol);
 510                         break;
 511 #endif
 512 #ifdef CONFIG_CMD_TFTPSRV
 513                 case TFTPSRV:
 514                         tftp_start_server();
 515                         break;
 516 #endif
 517 #if CONFIG_IS_ENABLED(UDP_FUNCTION_FASTBOOT)
 518                 case FASTBOOT_UDP:
 519                         fastboot_udp_start_server();
 520                         break;
 521 #endif
 522 #if CONFIG_IS_ENABLED(TCP_FUNCTION_FASTBOOT)
 523                 case FASTBOOT_TCP:
 524                         fastboot_tcp_start_server();
 525                         break;
 526 #endif
 527 #if defined(CONFIG_CMD_DHCP)
 528                 case DHCP:
 529                         bootp_reset();
 530                         net_ip.s_addr = 0;
 531                         dhcp_request();         /* Basically same as BOOTP */
 532                         break;
 533 #endif
 534                 case DHCP6:
 535                         if (IS_ENABLED(CONFIG_CMD_DHCP6))
 536                                 dhcp6_start();
 537                         break;
 538 #if defined(CONFIG_CMD_BOOTP)
 539                 case BOOTP:
 540                         bootp_reset();
 541                         net_ip.s_addr = 0;
 542                         bootp_request();
 543                         break;
 544 #endif
 545 #if defined(CONFIG_CMD_RARP)
 546                 case RARP:
 547                         rarp_try = 0;
 548                         net_ip.s_addr = 0;
 549                         rarp_request();
 550                         break;
 551 #endif
 552 #if defined(CONFIG_CMD_PING)
 553                 case PING:
 554                         ping_start();
 555                         break;
 556 #endif
 557 #if defined(CONFIG_CMD_PING6)
 558                 case PING6:
 559                         ping6_start();
 560                         break;
 561 #endif
 562 #if defined(CONFIG_CMD_NFS) && !defined(CONFIG_SPL_BUILD)
 563                 case NFS:
 564                         nfs_start();
 565                         break;
 566 #endif
 567 #if defined(CONFIG_CMD_WGET)
 568                 case WGET:
 569                         wget_start();
 570                         break;
 571 #endif
 572 #if defined(CONFIG_CMD_CDP)
 573                 case CDP:
 574                         cdp_start();
 575                         break;
 576 #endif
 577 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
 578                 case NETCONS:
 579                         nc_start();
 580                         break;
 581 #endif
 582 #if defined(CONFIG_CMD_DNS)
 583                 case DNS:
 584                         dns_start();
 585                         break;
 586 #endif
 587 #if defined(CONFIG_CMD_LINK_LOCAL)
 588                 case LINKLOCAL:
 589                         link_local_start();
 590                         break;
 591 #endif
 592 #if defined(CONFIG_CMD_WOL)
 593                 case WOL:
 594                         wol_start();
 595                         break;
 596 #endif
 597 #if defined(CONFIG_PHY_NCSI)
 598                 case NCSI:
 599                         ncsi_probe_packages();
 600                         break;
 601 #endif
 602                 case RS:
 603                         if (IS_ENABLED(CONFIG_IPV6_ROUTER_DISCOVERY))
 604                                 ip6_send_rs();
 605                         break;
 606                 default:
 607                         break;
 608                 }
 609
 610                 if (IS_ENABLED(CONFIG_PROT_UDP) && protocol == UDP)
 611                         udp_start();
 612
 613                 break;
 614         }
 615
 616 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 617 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 618         defined(CONFIG_LED_STATUS)                      && \
 619         defined(CONFIG_LED_STATUS_RED)
 620         /*
 621          * Echo the inverted link state to the fault LED.
 622          */
 623         if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
 624                 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_OFF);
 625         else
 626                 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_ON);
 627 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 628 #endif /* CONFIG_MII, ... */
 629 #ifdef CONFIG_USB_KEYBOARD
 630         net_busy_flag = 1;
 631 #endif
 632
 633         /*
 634          *      Main packet reception loop.  Loop receiving packets until
 635          *      someone sets `net_state' to a state that terminates.
 636          */
 637         for (;;) {
 638                 schedule();
 639                 if (arp_timeout_check() > 0)
 640                         time_start = get_timer(0);
 641
 642                 if (IS_ENABLED(CONFIG_IPV6)) {
 643                         if (use_ip6 && (ndisc_timeout_check() > 0))
 644                                 time_start = get_timer(0);
 645                 }
 646
 647                 /*
 648                  *      Check the ethernet for a new packet.  The ethernet
 649                  *      receive routine will process it.
 650                  *      Most drivers return the most recent packet size, but not
 651                  *      errors that may have happened.
 652                  */
 653                 eth_rx();
 654
 655                 /*
 656                  *      Abort if ctrl-c was pressed.
 657                  */
 658                 if (ctrlc()) {
 659                         /* cancel any ARP that may not have completed */
 660                         net_arp_wait_packet_ip.s_addr = 0;
 661
 662                         net_cleanup_loop();
 663                         eth_halt();
 664                         /* Invalidate the last protocol */
 665                         eth_set_last_protocol(BOOTP);
 666
 667                         puts("\nAbort\n");
 668                         /* include a debug print as well incase the debug
 669                            messages are directed to stderr */
 670                         debug_cond(DEBUG_INT_STATE, "--- net_loop Abort!\n");
 671                         ret = -EINTR;
 672                         goto done;
 673                 }
 674
 675                 /*
 676                  *      Check for a timeout, and run the timeout handler
 677                  *      if we have one.
 678                  */
 679                 if (time_handler &&
 680                     ((get_timer(0) - time_start) > time_delta)) {
 681                         thand_f *x;
 682
 683 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 684 #if     defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)        && \
 685         defined(CONFIG_LED_STATUS)                      && \
 686         defined(CONFIG_LED_STATUS_RED)
 687                         /*
 688                          * Echo the inverted link state to the fault LED.
 689                          */
 690                         if (miiphy_link(eth_get_dev()->name,
 691                                         CONFIG_SYS_FAULT_MII_ADDR))
 692                                 status_led_set(CONFIG_LED_STATUS_RED,
 693                                                CONFIG_LED_STATUS_OFF);
 694                         else
 695                                 status_led_set(CONFIG_LED_STATUS_RED,
 696                                                CONFIG_LED_STATUS_ON);
 697 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
 698 #endif /* CONFIG_MII, ... */
 699                         debug_cond(DEBUG_INT_STATE, "--- net_loop timeout\n");
 700                         x = time_handler;
 701                         time_handler = (thand_f *)0;
 702                         (*x)();
 703                 } else if (IS_ENABLED(CONFIG_IPV6_ROUTER_DISCOVERY))
 704                         if (time_handler && protocol == RS)
 705                                 if (!ip6_is_unspecified_addr(&net_gateway6) &&
 706                                     net_prefix_length != 0) {
 707                                         net_set_state(NETLOOP_SUCCESS);
 708                                         net_set_timeout_handler(0, NULL);
 709                                 }
 710
 711                 if (net_state == NETLOOP_FAIL)
 712                         ret = net_start_again();
 713
 714                 switch (net_state) {
 715                 case NETLOOP_RESTART:
 716                         net_restarted = 1;
 717                         goto restart;
 718
 719                 case NETLOOP_SUCCESS:
 720                         net_cleanup_loop();
 721                         if (net_boot_file_size > 0) {
 722                                 printf("Bytes transferred = %u (%x hex)\n",
 723                                        net_boot_file_size, net_boot_file_size);
 724                                 env_set_hex("filesize", net_boot_file_size);
 725                                 env_set_hex("fileaddr", image_load_addr);
 726                         }
 727                         if (protocol != NETCONS && protocol != NCSI)
 728                                 eth_halt();
 729                         else
 730                                 eth_halt_state_only();
 731
 732                         eth_set_last_protocol(protocol);
 733
 734                         ret = net_boot_file_size;
 735                         debug_cond(DEBUG_INT_STATE, "--- net_loop Success!\n");
 736                         goto done;
 737
 738                 case NETLOOP_FAIL:
 739                         net_cleanup_loop();
 740                         /* Invalidate the last protocol */
 741                         eth_set_last_protocol(BOOTP);
 742                         debug_cond(DEBUG_INT_STATE, "--- net_loop Fail!\n");
 743                         ret = -ENONET;
 744                         goto done;
 745
 746                 case NETLOOP_CONTINUE:
 747                         continue;
 748                 }
 749         }
 750
 751 done:
 752 #ifdef CONFIG_USB_KEYBOARD
 753         net_busy_flag = 0;
 754 #endif
 755 #ifdef CONFIG_CMD_TFTPPUT
 756         /* Clear out the handlers */
 757         net_set_udp_handler(NULL);
 758         net_set_icmp_handler(NULL);
 759 #endif
 760         net_set_state(prev_net_state);
 761
 762 #if defined(CONFIG_CMD_PCAP)
 763         if (pcap_active())
 764                 pcap_print_status();
 765 #endif
 766         return ret;
 767 }
 768
 769 /**********************************************************************/
 770
 771 static void start_again_timeout_handler(void)
 772 {
 773         net_set_state(NETLOOP_RESTART);
 774 }
 775
 776 int net_start_again(void)
 777 {
 778         char *nretry;
 779         int retry_forever = 0;
 780         unsigned long retrycnt = 0;
 781         int ret;
 782
 783         nretry = env_get("netretry");
 784         if (nretry) {
 785                 if (!strcmp(nretry, "yes"))
 786                         retry_forever = 1;
 787                 else if (!strcmp(nretry, "no"))
 788                         retrycnt = 0;
 789                 else if (!strcmp(nretry, "once"))
 790                         retrycnt = 1;
 791                 else
 792                         retrycnt = simple_strtoul(nretry, NULL, 0);
 793         } else {
 794                 retrycnt = 0;
 795                 retry_forever = 0;
 796         }
 797
 798         if ((!retry_forever) && (net_try_count > retrycnt)) {
 799                 eth_halt();
 800                 net_set_state(NETLOOP_FAIL);
 801                 /*
 802                  * We don't provide a way for the protocol to return an error,
 803                  * but this is almost always the reason.
 804                  */
 805                 return -ETIMEDOUT;
 806         }
 807
 808         net_try_count++;
 809
 810         eth_halt();
 811 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
 812         eth_try_another(!net_restarted);
 813 #endif
 814         ret = eth_init();
 815         if (net_restart_wrap) {
 816                 net_restart_wrap = 0;
 817                 if (net_dev_exists) {
 818                         net_set_timeout_handler(10000UL,
 819                                                 start_again_timeout_handler);
 820                         net_set_udp_handler(NULL);
 821                 } else {
 822                         net_set_state(NETLOOP_FAIL);
 823                 }
 824         } else {
 825                 net_set_state(NETLOOP_RESTART);
 826         }
 827         return ret;
 828 }
 829
 830 /**********************************************************************/
 831 /*
 832  *      Miscelaneous bits.
 833  */
 834
 835 static void dummy_handler(uchar *pkt, unsigned dport,
 836                         struct in_addr sip, unsigned sport,
 837                         unsigned len)
 838 {
 839 }
 840
 841 rxhand_f *net_get_udp_handler(void)
 842 {
 843         return udp_packet_handler;
 844 }
 845
 846 void net_set_udp_handler(rxhand_f *f)
 847 {
 848         debug_cond(DEBUG_INT_STATE, "--- net_loop UDP handler set (%p)\n", f);
 849         if (f == NULL)
 850                 udp_packet_handler = dummy_handler;
 851         else
 852                 udp_packet_handler = f;
 853 }
 854
 855 rxhand_f *net_get_arp_handler(void)
 856 {
 857         return arp_packet_handler;
 858 }
 859
 860 void net_set_arp_handler(rxhand_f *f)
 861 {
 862         debug_cond(DEBUG_INT_STATE, "--- net_loop ARP handler set (%p)\n", f);
 863         if (f == NULL)
 864                 arp_packet_handler = dummy_handler;
 865         else
 866                 arp_packet_handler = f;
 867 }
 868
 869 #ifdef CONFIG_CMD_TFTPPUT
 870 void net_set_icmp_handler(rxhand_icmp_f *f)
 871 {
 872         packet_icmp_handler = f;
 873 }
 874 #endif
 875
 876 void net_set_timeout_handler(ulong iv, thand_f *f)
 877 {
 878         if (iv == 0) {
 879                 debug_cond(DEBUG_INT_STATE,
 880                            "--- net_loop timeout handler cancelled\n");
 881                 time_handler = (thand_f *)0;
 882         } else {
 883                 debug_cond(DEBUG_INT_STATE,
 884                            "--- net_loop timeout handler set (%p)\n", f);
 885                 time_handler = f;
 886                 time_start = get_timer(0);
 887                 time_delta = iv * CONFIG_SYS_HZ / 1000;
 888         }
 889 }
 890
 891 uchar *net_get_async_tx_pkt_buf(void)
 892 {
 893         if (arp_is_waiting())
 894                 return arp_tx_packet; /* If we are waiting, we already sent */
 895         else
 896                 return net_tx_packet;
 897 }
 898
 899 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
 900                 int payload_len)
 901 {
 902         return net_send_ip_packet(ether, dest, dport, sport, payload_len,
 903                                   IPPROTO_UDP, 0, 0, 0);
 904 }
 905
 906 #if defined(CONFIG_PROT_TCP)
 907 int net_send_tcp_packet(int payload_len, int dport, int sport, u8 action,
 908                         u32 tcp_seq_num, u32 tcp_ack_num)
 909 {
 910         return net_send_ip_packet(net_server_ethaddr, net_server_ip, dport,
 911                                   sport, payload_len, IPPROTO_TCP, action,
 912                                   tcp_seq_num, tcp_ack_num);
 913 }
 914 #endif
 915
 916 int net_send_ip_packet(uchar *ether, struct in_addr dest, int dport, int sport,
 917                        int payload_len, int proto, u8 action, u32 tcp_seq_num,
 918                        u32 tcp_ack_num)
 919 {
 920         uchar *pkt;
 921         int eth_hdr_size;
 922         int pkt_hdr_size;
 923
 924         /* make sure the net_tx_packet is initialized (net_init() was called) */
 925         assert(net_tx_packet != NULL);
 926         if (net_tx_packet == NULL)
 927                 return -1;
 928
 929         /* convert to new style broadcast */
 930         if (dest.s_addr == 0)
 931                 dest.s_addr = 0xFFFFFFFF;
 932
 933         /* if broadcast, make the ether address a broadcast and don't do ARP */
 934         if (dest.s_addr == 0xFFFFFFFF)
 935                 ether = (uchar *)net_bcast_ethaddr;
 936
 937         pkt = (uchar *)net_tx_packet;
 938
 939         eth_hdr_size = net_set_ether(pkt, ether, PROT_IP);
 940
 941         switch (proto) {
 942         case IPPROTO_UDP:
 943                 net_set_udp_header(pkt + eth_hdr_size, dest, dport, sport,
 944                                    payload_len);
 945                 pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
 946                 break;
 947 #if defined(CONFIG_PROT_TCP)
 948         case IPPROTO_TCP:
 949                 pkt_hdr_size = eth_hdr_size
 950                         + tcp_set_tcp_header(pkt + eth_hdr_size, dport, sport,
 951                                              payload_len, action, tcp_seq_num,
 952                                              tcp_ack_num);
 953                 break;
 954 #endif
 955         default:
 956                 return -EINVAL;
 957         }
 958
 959         /* if MAC address was not discovered yet, do an ARP request */
 960         if (memcmp(ether, net_null_ethaddr, 6) == 0) {
 961                 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest);
 962
 963                 /* save the ip and eth addr for the packet to send after arp */
 964                 net_arp_wait_packet_ip = dest;
 965                 arp_wait_packet_ethaddr = ether;
 966
 967                 /* size of the waiting packet */
 968                 arp_wait_tx_packet_size = pkt_hdr_size + payload_len;
 969
 970                 /* and do the ARP request */
 971                 arp_wait_try = 1;
 972                 arp_wait_timer_start = get_timer(0);
 973                 arp_request();
 974                 return 1;       /* waiting */
 975         } else {
 976                 debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
 977                            &dest, ether);
 978                 net_send_packet(net_tx_packet, pkt_hdr_size + payload_len);
 979                 return 0;       /* transmitted */
 980         }
 981 }
 982
 983 #ifdef CONFIG_IP_DEFRAG
 984 /*
 985  * This function collects fragments in a single packet, according
 986  * to the algorithm in RFC815. It returns NULL or the pointer to
 987  * a complete packet, in static storage
 988  */
 989 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG)
 990
 991 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE)
 992
 993 /*
 994  * this is the packet being assembled, either data or frag control.
 995  * Fragments go by 8 bytes, so this union must be 8 bytes long
 996  */
 997 struct hole {
 998         /* first_byte is address of this structure */
 999         u16 last_byte;  /* last byte in this hole + 1 (begin of next hole) */
1000         u16 next_hole;  /* index of next (in 8-b blocks), 0 == none */
1001         u16 prev_hole;  /* index of prev, 0 == none */
1002         u16 unused;
1003 };
1004
1005 static struct ip_udp_hdr *__net_defragment(struct ip_udp_hdr *ip, int *lenp)
1006 {
1007         static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
1008         static u16 first_hole, total_len;
1009         struct hole *payload, *thisfrag, *h, *newh;
1010         struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff;
1011         uchar *indata = (uchar *)ip;
1012         int offset8, start, len, done = 0;
1013         u16 ip_off = ntohs(ip->ip_off);
1014
1015         /*
1016          * Calling code already rejected <, but we don't have to deal
1017          * with an IP fragment with no payload.
1018          */
1019         if (ntohs(ip->ip_len) <= IP_HDR_SIZE)
1020                 return NULL;
1021
1022         /* payload starts after IP header, this fragment is in there */
1023         payload = (struct hole *)(pkt_buff + IP_HDR_SIZE);
1024         offset8 =  (ip_off & IP_OFFS);
1025         thisfrag = payload + offset8;
1026         start = offset8 * 8;
1027         len = ntohs(ip->ip_len) - IP_HDR_SIZE;
1028
1029         /* All but last fragment must have a multiple-of-8 payload. */
1030         if ((len & 7) && (ip_off & IP_FLAGS_MFRAG))
1031                 return NULL;
1032
1033         if (start + len > IP_MAXUDP) /* fragment extends too far */
1034                 return NULL;
1035
1036         if (!total_len || localip->ip_id != ip->ip_id) {
1037                 /* new (or different) packet, reset structs */
1038                 total_len = 0xffff;
1039                 payload[0].last_byte = ~0;
1040                 payload[0].next_hole = 0;
1041                 payload[0].prev_hole = 0;
1042                 first_hole = 0;
1043                 /* any IP header will work, copy the first we received */
1044                 memcpy(localip, ip, IP_HDR_SIZE);
1045         }
1046
1047         /*
1048          * What follows is the reassembly algorithm. We use the payload
1049          * array as a linked list of hole descriptors, as each hole starts
1050          * at a multiple of 8 bytes. However, last byte can be whatever value,
1051          * so it is represented as byte count, not as 8-byte blocks.
1052          */
1053
1054         h = payload + first_hole;
1055         while (h->last_byte < start) {
1056                 if (!h->next_hole) {
1057                         /* no hole that far away */
1058                         return NULL;
1059                 }
1060                 h = payload + h->next_hole;
1061         }
1062
1063         /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
1064         if (offset8 + ((len + 7) / 8) <= h - payload) {
1065                 /* no overlap with holes (dup fragment?) */
1066                 return NULL;
1067         }
1068
1069         if (!(ip_off & IP_FLAGS_MFRAG)) {
1070                 /* no more fragmentss: truncate this (last) hole */
1071                 total_len = start + len;
1072                 h->last_byte = start + len;
1073         }
1074
1075         /*
1076          * There is some overlap: fix the hole list. This code deals
1077          * with a fragment that overlaps with two different holes
1078          * (thus being a superset of a previously-received fragment)
1079          * by only using the part of the fragment that fits in the
1080          * first hole.
1081          */
1082         if (h->last_byte < start + len)
1083                 len = h->last_byte - start;
1084
1085         if ((h >= thisfrag) && (h->last_byte <= start + len)) {
1086                 /* complete overlap with hole: remove hole */
1087                 if (!h->prev_hole && !h->next_hole) {
1088                         /* last remaining hole */
1089                         done = 1;
1090                 } else if (!h->prev_hole) {
1091                         /* first hole */
1092                         first_hole = h->next_hole;
1093                         payload[h->next_hole].prev_hole = 0;
1094                 } else if (!h->next_hole) {
1095                         /* last hole */
1096                         payload[h->prev_hole].next_hole = 0;
1097                 } else {
1098                         /* in the middle of the list */
1099                         payload[h->next_hole].prev_hole = h->prev_hole;
1100                         payload[h->prev_hole].next_hole = h->next_hole;
1101                 }
1102
1103         } else if (h->last_byte <= start + len) {
1104                 /* overlaps with final part of the hole: shorten this hole */
1105                 h->last_byte = start;
1106
1107         } else if (h >= thisfrag) {
1108                 /* overlaps with initial part of the hole: move this hole */
1109                 newh = thisfrag + (len / 8);
1110                 *newh = *h;
1111                 h = newh;
1112                 if (h->next_hole)
1113                         payload[h->next_hole].prev_hole = (h - payload);
1114                 if (h->prev_hole)
1115                         payload[h->prev_hole].next_hole = (h - payload);
1116                 else
1117                         first_hole = (h - payload);
1118
1119         } else {
1120                 /* fragment sits in the middle: split the hole */
1121                 newh = thisfrag + (len / 8);
1122                 *newh = *h;
1123                 h->last_byte = start;
1124                 h->next_hole = (newh - payload);
1125                 newh->prev_hole = (h - payload);
1126                 if (newh->next_hole)
1127                         payload[newh->next_hole].prev_hole = (newh - payload);
1128         }
1129
1130         /* finally copy this fragment and possibly return whole packet */
1131         memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len);
1132         if (!done)
1133                 return NULL;
1134
1135         *lenp = total_len + IP_HDR_SIZE;
1136         localip->ip_len = htons(*lenp);
1137         return localip;
1138 }
1139
1140 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
1141         int *lenp)
1142 {
1143         u16 ip_off = ntohs(ip->ip_off);
1144         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1145                 return ip; /* not a fragment */
1146         return __net_defragment(ip, lenp);
1147 }
1148
1149 #else /* !CONFIG_IP_DEFRAG */
1150
1151 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
1152         int *lenp)
1153 {
1154         u16 ip_off = ntohs(ip->ip_off);
1155         if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
1156                 return ip; /* not a fragment */
1157         return NULL;
1158 }
1159 #endif
1160
1161 /**
1162  * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
1163  * drop others.
1164  *
1165  * @parma ip    IP packet containing the ICMP
1166  */
1167 static void receive_icmp(struct ip_udp_hdr *ip, int len,
1168                         struct in_addr src_ip, struct ethernet_hdr *et)
1169 {
1170         struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
1171
1172         switch (icmph->type) {
1173         case ICMP_REDIRECT:
1174                 if (icmph->code != ICMP_REDIR_HOST)
1175                         return;
1176                 printf(" ICMP Host Redirect to %pI4 ",
1177                        &icmph->un.gateway);
1178                 break;
1179         default:
1180 #if defined(CONFIG_CMD_PING)
1181                 ping_receive(et, ip, len);
1182 #endif
1183 #ifdef CONFIG_CMD_TFTPPUT
1184                 if (packet_icmp_handler)
1185                         packet_icmp_handler(icmph->type, icmph->code,
1186                                             ntohs(ip->udp_dst), src_ip,
1187                                             ntohs(ip->udp_src), icmph->un.data,
1188                                             ntohs(ip->udp_len));
1189 #endif
1190                 break;
1191         }
1192 }
1193
1194 void net_process_received_packet(uchar *in_packet, int len)
1195 {
1196         struct ethernet_hdr *et;
1197         struct ip_udp_hdr *ip;
1198         struct in_addr dst_ip;
1199         struct in_addr src_ip;
1200         int eth_proto;
1201 #if defined(CONFIG_CMD_CDP)
1202         int iscdp;
1203 #endif
1204         ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
1205
1206         debug_cond(DEBUG_NET_PKT, "packet received\n");
1207         if (DEBUG_NET_PKT_TRACE)
1208                 print_hex_dump_bytes("rx: ", DUMP_PREFIX_OFFSET, in_packet,
1209                                      len);
1210
1211 #if defined(CONFIG_CMD_PCAP)
1212         pcap_post(in_packet, len, false);
1213 #endif
1214         net_rx_packet = in_packet;
1215         net_rx_packet_len = len;
1216         et = (struct ethernet_hdr *)in_packet;
1217
1218         /* too small packet? */
1219         if (len < ETHER_HDR_SIZE)
1220                 return;
1221
1222 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
1223         if (push_packet) {
1224                 (*push_packet)(in_packet, len);
1225                 return;
1226         }
1227 #endif
1228
1229 #if defined(CONFIG_CMD_CDP)
1230         /* keep track if packet is CDP */
1231         iscdp = is_cdp_packet(et->et_dest);
1232 #endif
1233
1234         myvlanid = ntohs(net_our_vlan);
1235         if (myvlanid == (ushort)-1)
1236                 myvlanid = VLAN_NONE;
1237         mynvlanid = ntohs(net_native_vlan);
1238         if (mynvlanid == (ushort)-1)
1239                 mynvlanid = VLAN_NONE;
1240
1241         eth_proto = ntohs(et->et_protlen);
1242
1243         if (eth_proto < 1514) {
1244                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1245                 /*
1246                  *      Got a 802.2 packet.  Check the other protocol field.
1247                  *      XXX VLAN over 802.2+SNAP not implemented!
1248                  */
1249                 eth_proto = ntohs(et802->et_prot);
1250
1251                 ip = (struct ip_udp_hdr *)(in_packet + E802_HDR_SIZE);
1252                 len -= E802_HDR_SIZE;
1253
1254         } else if (eth_proto != PROT_VLAN) {    /* normal packet */
1255                 ip = (struct ip_udp_hdr *)(in_packet + ETHER_HDR_SIZE);
1256                 len -= ETHER_HDR_SIZE;
1257
1258         } else {                        /* VLAN packet */
1259                 struct vlan_ethernet_hdr *vet =
1260                         (struct vlan_ethernet_hdr *)et;
1261
1262                 debug_cond(DEBUG_NET_PKT, "VLAN packet received\n");
1263
1264                 /* too small packet? */
1265                 if (len < VLAN_ETHER_HDR_SIZE)
1266                         return;
1267
1268                 /* if no VLAN active */
1269                 if ((ntohs(net_our_vlan) & VLAN_IDMASK) == VLAN_NONE
1270 #if defined(CONFIG_CMD_CDP)
1271                                 && iscdp == 0
1272 #endif
1273                                 )
1274                         return;
1275
1276                 cti = ntohs(vet->vet_tag);
1277                 vlanid = cti & VLAN_IDMASK;
1278                 eth_proto = ntohs(vet->vet_type);
1279
1280                 ip = (struct ip_udp_hdr *)(in_packet + VLAN_ETHER_HDR_SIZE);
1281                 len -= VLAN_ETHER_HDR_SIZE;
1282         }
1283
1284         debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto);
1285
1286 #if defined(CONFIG_CMD_CDP)
1287         if (iscdp) {
1288                 cdp_receive((uchar *)ip, len);
1289                 return;
1290         }
1291 #endif
1292
1293         if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
1294                 if (vlanid == VLAN_NONE)
1295                         vlanid = (mynvlanid & VLAN_IDMASK);
1296                 /* not matched? */
1297                 if (vlanid != (myvlanid & VLAN_IDMASK))
1298                         return;
1299         }
1300
1301         switch (eth_proto) {
1302         case PROT_ARP:
1303                 arp_receive(et, ip, len);
1304                 break;
1305
1306 #ifdef CONFIG_CMD_RARP
1307         case PROT_RARP:
1308                 rarp_receive(ip, len);
1309                 break;
1310 #endif
1311 #if IS_ENABLED(CONFIG_IPV6)
1312         case PROT_IP6:
1313                 net_ip6_handler(et, (struct ip6_hdr *)ip, len);
1314                 break;
1315 #endif
1316         case PROT_IP:
1317                 debug_cond(DEBUG_NET_PKT, "Got IP\n");
1318                 /* Before we start poking the header, make sure it is there */
1319                 if (len < IP_HDR_SIZE) {
1320                         debug("len bad %d < %lu\n", len,
1321                               (ulong)IP_HDR_SIZE);
1322                         return;
1323                 }
1324                 /* Check the packet length */
1325                 if (len < ntohs(ip->ip_len)) {
1326                         debug("len bad %d < %d\n", len, ntohs(ip->ip_len));
1327                         return;
1328                 }
1329                 len = ntohs(ip->ip_len);
1330                 if (len < IP_HDR_SIZE) {
1331                         debug("bad ip->ip_len %d < %d\n", len, (int)IP_HDR_SIZE);
1332                         return;
1333                 }
1334                 debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n",
1335                            len, ip->ip_hl_v & 0xff);
1336
1337                 /* Can't deal with anything except IPv4 */
1338                 if ((ip->ip_hl_v & 0xf0) != 0x40)
1339                         return;
1340                 /* Can't deal with IP options (headers != 20 bytes) */
1341                 if ((ip->ip_hl_v & 0x0f) != 0x05)
1342                         return;
1343                 /* Check the Checksum of the header */
1344                 if (!ip_checksum_ok((uchar *)ip, IP_HDR_SIZE)) {
1345                         debug("checksum bad\n");
1346                         return;
1347                 }
1348                 /* If it is not for us, ignore it */
1349                 dst_ip = net_read_ip(&ip->ip_dst);
1350                 if (net_ip.s_addr && dst_ip.s_addr != net_ip.s_addr &&
1351                     dst_ip.s_addr != 0xFFFFFFFF) {
1352                                 return;
1353                 }
1354                 /* Read source IP address for later use */
1355                 src_ip = net_read_ip(&ip->ip_src);
1356                 /*
1357                  * The function returns the unchanged packet if it's not
1358                  * a fragment, and either the complete packet or NULL if
1359                  * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1360                  */
1361                 ip = net_defragment(ip, &len);
1362                 if (!ip)
1363                         return;
1364                 /*
1365                  * watch for ICMP host redirects
1366                  *
1367                  * There is no real handler code (yet). We just watch
1368                  * for ICMP host redirect messages. In case anybody
1369                  * sees these messages: please contact me
1370                  * ([email protected]), or - even better - send me the
1371                  * necessary fixes :-)
1372                  *
1373                  * Note: in all cases where I have seen this so far
1374                  * it was a problem with the router configuration,
1375                  * for instance when a router was configured in the
1376                  * BOOTP reply, but the TFTP server was on the same
1377                  * subnet. So this is probably a warning that your
1378                  * configuration might be wrong. But I'm not really
1379                  * sure if there aren't any other situations.
1380                  *
1381                  * Simon Glass <[email protected]>: We get an ICMP when
1382                  * we send a tftp packet to a dead connection, or when
1383                  * there is no server at the other end.
1384                  */
1385                 if (ip->ip_p == IPPROTO_ICMP) {
1386                         receive_icmp(ip, len, src_ip, et);
1387                         return;
1388 #if defined(CONFIG_PROT_TCP)
1389                 } else if (ip->ip_p == IPPROTO_TCP) {
1390                         debug_cond(DEBUG_DEV_PKT,
1391                                    "TCP PH (to=%pI4, from=%pI4, len=%d)\n",
1392                                    &dst_ip, &src_ip, len);
1393
1394                         rxhand_tcp_f((union tcp_build_pkt *)ip, len);
1395                         return;
1396 #endif
1397                 } else if (ip->ip_p != IPPROTO_UDP) {   /* Only UDP packets */
1398                         return;
1399                 }
1400
1401                 if (ntohs(ip->udp_len) < UDP_HDR_SIZE || ntohs(ip->udp_len) > len - IP_HDR_SIZE)
1402                         return;
1403
1404                 debug_cond(DEBUG_DEV_PKT,
1405                            "received UDP (to=%pI4, from=%pI4, len=%d)\n",
1406                            &dst_ip, &src_ip, len);
1407
1408                 if (IS_ENABLED(CONFIG_UDP_CHECKSUM) && ip->udp_xsum != 0) {
1409                         ulong   xsum;
1410                         u8 *sumptr;
1411                         ushort  sumlen;
1412
1413                         xsum  = ip->ip_p;
1414                         xsum += (ntohs(ip->udp_len));
1415                         xsum += (ntohl(ip->ip_src.s_addr) >> 16) & 0x0000ffff;
1416                         xsum += (ntohl(ip->ip_src.s_addr) >>  0) & 0x0000ffff;
1417                         xsum += (ntohl(ip->ip_dst.s_addr) >> 16) & 0x0000ffff;
1418                         xsum += (ntohl(ip->ip_dst.s_addr) >>  0) & 0x0000ffff;
1419
1420                         sumlen = ntohs(ip->udp_len);
1421                         sumptr = (u8 *)&ip->udp_src;
1422
1423                         while (sumlen > 1) {
1424                                 /* inlined ntohs() to avoid alignment errors */
1425                                 xsum += (sumptr[0] << 8) + sumptr[1];
1426                                 sumptr += 2;
1427                                 sumlen -= 2;
1428                         }
1429                         if (sumlen > 0)
1430                                 xsum += (sumptr[0] << 8) + sumptr[0];
1431                         while ((xsum >> 16) != 0) {
1432                                 xsum = (xsum & 0x0000ffff) +
1433                                        ((xsum >> 16) & 0x0000ffff);
1434                         }
1435                         if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1436                                 printf(" UDP wrong checksum %08lx %08x\n",
1437                                        xsum, ntohs(ip->udp_xsum));
1438                                 return;
1439                         }
1440                 }
1441
1442 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
1443                 nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
1444                                 src_ip,
1445                                 ntohs(ip->udp_dst),
1446                                 ntohs(ip->udp_src),
1447                                 ntohs(ip->udp_len) - UDP_HDR_SIZE);
1448 #endif
1449                 /*
1450                  * IP header OK.  Pass the packet to the current handler.
1451                  */
1452                 (*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE,
1453                                       ntohs(ip->udp_dst),
1454                                       src_ip,
1455                                       ntohs(ip->udp_src),
1456                                       ntohs(ip->udp_len) - UDP_HDR_SIZE);
1457                 break;
1458 #ifdef CONFIG_CMD_WOL
1459         case PROT_WOL:
1460                 wol_receive(ip, len);
1461                 break;
1462 #endif
1463 #ifdef CONFIG_PHY_NCSI
1464         case PROT_NCSI:
1465                 ncsi_receive(et, ip, len);
1466                 break;
1467 #endif
1468         }
1469 }
1470
1471 /**********************************************************************/
1472
1473 static int net_check_prereq(enum proto_t protocol)
1474 {
1475         switch (protocol) {
1476                 /* Fall through */
1477 #if defined(CONFIG_CMD_PING)
1478         case PING:
1479                 if (net_ping_ip.s_addr == 0) {
1480                         puts("*** ERROR: ping address not given\n");
1481                         return 1;
1482                 }
1483                 goto common;
1484 #endif
1485 #if defined(CONFIG_CMD_PING6)
1486         case PING6:
1487                 if (ip6_is_unspecified_addr(&net_ping_ip6)) {
1488                         puts("*** ERROR: ping address not given\n");
1489                         return 1;
1490                 }
1491                 goto common;
1492 #endif
1493 #if defined(CONFIG_CMD_DNS)
1494         case DNS:
1495                 if (net_dns_server.s_addr == 0) {
1496                         puts("*** ERROR: DNS server address not given\n");
1497                         return 1;
1498                 }
1499                 goto common;
1500 #endif
1501 #if defined(CONFIG_PROT_UDP)
1502         case UDP:
1503                 if (udp_prereq())
1504                         return 1;
1505                 goto common;
1506 #endif
1507
1508 #if defined(CONFIG_CMD_NFS)
1509         case NFS:
1510 #endif
1511                 /* Fall through */
1512         case TFTPGET:
1513         case TFTPPUT:
1514                 if (IS_ENABLED(CONFIG_IPV6) && use_ip6) {
1515                         if (!memcmp(&net_server_ip6, &net_null_addr_ip6,
1516                                     sizeof(struct in6_addr)) &&
1517                                     !strchr(net_boot_file_name, '[')) {
1518                                 puts("*** ERROR: `serverip6' not set\n");
1519                                 return 1;
1520                         }
1521                 } else if (net_server_ip.s_addr == 0 && !is_serverip_in_cmd()) {
1522                         puts("*** ERROR: `serverip' not set\n");
1523                         return 1;
1524                 }
1525 #if     defined(CONFIG_CMD_PING) || \
1526         defined(CONFIG_CMD_DNS) || defined(CONFIG_PROT_UDP)
1527 common:
1528 #endif
1529                 /* Fall through */
1530
1531         case NETCONS:
1532         case FASTBOOT_UDP:
1533         case FASTBOOT_TCP:
1534         case TFTPSRV:
1535                 if (IS_ENABLED(CONFIG_IPV6) && use_ip6) {
1536                         if (!memcmp(&net_link_local_ip6, &net_null_addr_ip6,
1537                                     sizeof(struct in6_addr))) {
1538                                 puts("*** ERROR: `ip6addr` not set\n");
1539                                 return 1;
1540                         }
1541                 } else if (net_ip.s_addr == 0) {
1542                         puts("*** ERROR: `ipaddr' not set\n");
1543                         return 1;
1544                 }
1545                 /* Fall through */
1546
1547 #ifdef CONFIG_CMD_RARP
1548         case RARP:
1549 #endif
1550 #ifdef CONFIG_PHY_NCSI
1551         case NCSI:
1552 #endif
1553         case BOOTP:
1554         case CDP:
1555         case DHCP:
1556         case LINKLOCAL:
1557                 if (memcmp(net_ethaddr, "\0\0\0\0\0\0", 6) == 0) {
1558                         int num = eth_get_dev_index();
1559
1560                         switch (num) {
1561                         case -1:
1562                                 puts("*** ERROR: No ethernet found.\n");
1563                                 return 1;
1564                         case 0:
1565                                 puts("*** ERROR: `ethaddr' not set\n");
1566                                 break;
1567                         default:
1568                                 printf("*** ERROR: `eth%daddr' not set\n",
1569                                        num);
1570                                 break;
1571                         }
1572
1573                         net_start_again();
1574                         return 2;
1575                 }
1576                 /* Fall through */
1577         default:
1578                 return 0;
1579         }
1580         return 0;               /* OK */
1581 }
1582 /**********************************************************************/
1583
1584 int
1585 net_eth_hdr_size(void)
1586 {
1587         ushort myvlanid;
1588
1589         myvlanid = ntohs(net_our_vlan);
1590         if (myvlanid == (ushort)-1)
1591                 myvlanid = VLAN_NONE;
1592
1593         return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1594                 VLAN_ETHER_HDR_SIZE;
1595 }
1596
1597 int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot)
1598 {
1599         struct ethernet_hdr *et = (struct ethernet_hdr *)xet;
1600         ushort myvlanid;
1601
1602         myvlanid = ntohs(net_our_vlan);
1603         if (myvlanid == (ushort)-1)
1604                 myvlanid = VLAN_NONE;
1605
1606         memcpy(et->et_dest, dest_ethaddr, 6);
1607         memcpy(et->et_src, net_ethaddr, 6);
1608         if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1609                 et->et_protlen = htons(prot);
1610                 return ETHER_HDR_SIZE;
1611         } else {
1612                 struct vlan_ethernet_hdr *vet =
1613                         (struct vlan_ethernet_hdr *)xet;
1614
1615                 vet->vet_vlan_type = htons(PROT_VLAN);
1616                 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1617                 vet->vet_type = htons(prot);
1618                 return VLAN_ETHER_HDR_SIZE;
1619         }
1620 }
1621
1622 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
1623 {
1624         ushort protlen;
1625
1626         memcpy(et->et_dest, addr, 6);
1627         memcpy(et->et_src, net_ethaddr, 6);
1628         protlen = ntohs(et->et_protlen);
1629         if (protlen == PROT_VLAN) {
1630                 struct vlan_ethernet_hdr *vet =
1631                         (struct vlan_ethernet_hdr *)et;
1632                 vet->vet_type = htons(prot);
1633                 return VLAN_ETHER_HDR_SIZE;
1634         } else if (protlen > 1514) {
1635                 et->et_protlen = htons(prot);
1636                 return ETHER_HDR_SIZE;
1637         } else {
1638                 /* 802.2 + SNAP */
1639                 struct e802_hdr *et802 = (struct e802_hdr *)et;
1640                 et802->et_prot = htons(prot);
1641                 return E802_HDR_SIZE;
1642         }
1643 }
1644
1645 void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source,
1646                        u16 pkt_len, u8 proto)
1647 {
1648         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1649
1650         /*
1651          *      Construct an IP header.
1652          */
1653         /* IP_HDR_SIZE / 4 (not including UDP) */
1654         ip->ip_hl_v  = 0x45;
1655         ip->ip_tos   = 0;
1656         ip->ip_len   = htons(pkt_len);
1657         ip->ip_p     = proto;
1658         ip->ip_id    = htons(net_ip_id++);
1659         ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
1660         ip->ip_ttl   = 255;
1661         ip->ip_sum   = 0;
1662         /* already in network byte order */
1663         net_copy_ip((void *)&ip->ip_src, &source);
1664         /* already in network byte order */
1665         net_copy_ip((void *)&ip->ip_dst, &dest);
1666
1667         ip->ip_sum   = compute_ip_checksum(ip, IP_HDR_SIZE);
1668 }
1669
1670 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport,
1671                         int len)
1672 {
1673         struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1674
1675         /*
1676          *      If the data is an odd number of bytes, zero the
1677          *      byte after the last byte so that the checksum
1678          *      will work.
1679          */
1680         if (len & 1)
1681                 pkt[IP_UDP_HDR_SIZE + len] = 0;
1682
1683         net_set_ip_header(pkt, dest, net_ip, IP_UDP_HDR_SIZE + len,
1684                           IPPROTO_UDP);
1685
1686         ip->udp_src  = htons(sport);
1687         ip->udp_dst  = htons(dport);
1688         ip->udp_len  = htons(UDP_HDR_SIZE + len);
1689         ip->udp_xsum = 0;
1690 }
1691
1692 void copy_filename(char *dst, const char *src, int size)
1693 {
1694         if (src && *src && (*src == '"')) {
1695                 ++src;
1696                 --size;
1697         }
1698
1699         while ((--size > 0) && src && *src && (*src != '"'))
1700                 *dst++ = *src++;
1701         *dst = '\0';
1702 }
1703
1704 int is_serverip_in_cmd(void)
1705 {
1706         return !!strchr(net_boot_file_name, ':');
1707 }
1708
1709 int net_parse_bootfile(struct in_addr *ipaddr, char *filename, int max_len)
1710 {
1711         char *colon;
1712         struct in_addr ip;
1713         ip.s_addr = 0;
1714
1715         if (net_boot_file_name[0] == '\0')
1716                 return 0;
1717
1718         colon = strchr(net_boot_file_name, ':');
1719         if (colon) {
1720                 ip = string_to_ip(net_boot_file_name);
1721                 if (ipaddr && ip.s_addr)
1722                         *ipaddr = ip;
1723         }
1724         if (ip.s_addr) {
1725                 strncpy(filename, colon + 1, max_len);
1726         } else {
1727                 strncpy(filename, net_boot_file_name, max_len);
1728         }
1729         filename[max_len - 1] = '\0';
1730
1731         return 1;
1732 }
1733
1734 void ip_to_string(struct in_addr x, char *s)
1735 {
1736         x.s_addr = ntohl(x.s_addr);
1737         sprintf(s, "%d.%d.%d.%d",
1738                 (int) ((x.s_addr >> 24) & 0xff),
1739                 (int) ((x.s_addr >> 16) & 0xff),
1740                 (int) ((x.s_addr >> 8) & 0xff),
1741                 (int) ((x.s_addr >> 0) & 0xff)
1742         );
1743 }
1744
1745 void vlan_to_string(ushort x, char *s)
1746 {
1747         x = ntohs(x);
1748
1749         if (x == (ushort)-1)
1750                 x = VLAN_NONE;
1751
1752         if (x == VLAN_NONE)
1753                 strcpy(s, "none");
1754         else
1755                 sprintf(s, "%d", x & VLAN_IDMASK);
1756 }
1757
1758 ushort string_to_vlan(const char *s)
1759 {
1760         ushort id;
1761
1762         if (s == NULL)
1763                 return htons(VLAN_NONE);
1764
1765         if (*s < '0' || *s > '9')
1766                 id = VLAN_NONE;
1767         else
1768                 id = (ushort)dectoul(s, NULL);
1769
1770         return htons(id);
1771 }
1772
1773 ushort env_get_vlan(char *var)
1774 {
1775         return string_to_vlan(env_get(var));
1776 }