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