1 /* 2 * Copied from Linux Monitor (LiMon) - Networking. 3 * 4 * Copyright 1994 - 2000 Neil Russell. 5 * (See License) 6 * Copyright 2000 Roland Borde 7 * Copyright 2000 Paolo Scaffardi 8 * Copyright 2000-2002 Wolfgang Denk, wd@denx.de 9 * SPDX-License-Identifier: GPL-2.0 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 * SNTP: 76 * 77 * Prerequisites: - own ethernet address 78 * - own IP address 79 * We want: - network time 80 * Next step: none 81 */ 82 83 84 #include <common.h> 85 #include <command.h> 86 #include <console.h> 87 #include <environment.h> 88 #include <errno.h> 89 #include <net.h> 90 #if defined(CONFIG_UDP_FUNCTION_FASTBOOT) 91 #include <net/fastboot.h> 92 #endif 93 #include <net/tftp.h> 94 #if defined(CONFIG_LED_STATUS) 95 #include <miiphy.h> 96 #include <status_led.h> 97 #endif 98 #include <watchdog.h> 99 #include <linux/compiler.h> 100 #include "arp.h" 101 #include "bootp.h" 102 #include "cdp.h" 103 #if defined(CONFIG_CMD_DNS) 104 #include "dns.h" 105 #endif 106 #include "link_local.h" 107 #include "nfs.h" 108 #include "ping.h" 109 #include "rarp.h" 110 #if defined(CONFIG_CMD_SNTP) 111 #include "sntp.h" 112 #endif 113 114 DECLARE_GLOBAL_DATA_PTR; 115 116 /** BOOTP EXTENTIONS **/ 117 118 /* Our subnet mask (0=unknown) */ 119 struct in_addr net_netmask; 120 /* Our gateways IP address */ 121 struct in_addr net_gateway; 122 /* Our DNS IP address */ 123 struct in_addr net_dns_server; 124 #if defined(CONFIG_BOOTP_DNS2) 125 /* Our 2nd DNS IP address */ 126 struct in_addr net_dns_server2; 127 #endif 128 129 #ifdef CONFIG_MCAST_TFTP /* Multicast TFTP */ 130 struct in_addr net_mcast_addr; 131 #endif 132 133 /** END OF BOOTP EXTENTIONS **/ 134 135 /* Our ethernet address */ 136 u8 net_ethaddr[6]; 137 /* Boot server enet address */ 138 u8 net_server_ethaddr[6]; 139 /* Our IP addr (0 = unknown) */ 140 struct in_addr net_ip; 141 /* Server IP addr (0 = unknown) */ 142 struct in_addr net_server_ip; 143 /* Current receive packet */ 144 uchar *net_rx_packet; 145 /* Current rx packet length */ 146 int net_rx_packet_len; 147 /* IP packet ID */ 148 static unsigned net_ip_id; 149 /* Ethernet bcast address */ 150 const u8 net_bcast_ethaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 151 const u8 net_null_ethaddr[6]; 152 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER) 153 void (*push_packet)(void *, int len) = 0; 154 #endif 155 /* Network loop state */ 156 enum net_loop_state net_state; 157 /* Tried all network devices */ 158 int net_restart_wrap; 159 /* Network loop restarted */ 160 static int net_restarted; 161 /* At least one device configured */ 162 static int net_dev_exists; 163 164 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */ 165 /* default is without VLAN */ 166 ushort net_our_vlan = 0xFFFF; 167 /* ditto */ 168 ushort net_native_vlan = 0xFFFF; 169 170 /* Boot File name */ 171 char net_boot_file_name[1024]; 172 /* The actual transferred size of the bootfile (in bytes) */ 173 u32 net_boot_file_size; 174 /* Boot file size in blocks as reported by the DHCP server */ 175 u32 net_boot_file_expected_size_in_blocks; 176 177 #if defined(CONFIG_CMD_SNTP) 178 /* NTP server IP address */ 179 struct in_addr net_ntp_server; 180 /* offset time from UTC */ 181 int net_ntp_time_offset; 182 #endif 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_bootfile(const char *name, const char *value, enum env_op op, 213 int flags) 214 { 215 if (flags & H_PROGRAMMATIC) 216 return 0; 217 218 switch (op) { 219 case env_op_create: 220 case env_op_overwrite: 221 copy_filename(net_boot_file_name, value, 222 sizeof(net_boot_file_name)); 223 break; 224 default: 225 break; 226 } 227 228 return 0; 229 } 230 U_BOOT_ENV_CALLBACK(bootfile, on_bootfile); 231 232 static int on_ipaddr(const char *name, const char *value, enum env_op op, 233 int flags) 234 { 235 if (flags & H_PROGRAMMATIC) 236 return 0; 237 238 net_ip = string_to_ip(value); 239 240 return 0; 241 } 242 U_BOOT_ENV_CALLBACK(ipaddr, on_ipaddr); 243 244 static int on_gatewayip(const char *name, const char *value, enum env_op op, 245 int flags) 246 { 247 if (flags & H_PROGRAMMATIC) 248 return 0; 249 250 net_gateway = string_to_ip(value); 251 252 return 0; 253 } 254 U_BOOT_ENV_CALLBACK(gatewayip, on_gatewayip); 255 256 static int on_netmask(const char *name, const char *value, enum env_op op, 257 int flags) 258 { 259 if (flags & H_PROGRAMMATIC) 260 return 0; 261 262 net_netmask = string_to_ip(value); 263 264 return 0; 265 } 266 U_BOOT_ENV_CALLBACK(netmask, on_netmask); 267 268 static int on_serverip(const char *name, const char *value, enum env_op op, 269 int flags) 270 { 271 if (flags & H_PROGRAMMATIC) 272 return 0; 273 274 net_server_ip = string_to_ip(value); 275 276 return 0; 277 } 278 U_BOOT_ENV_CALLBACK(serverip, on_serverip); 279 280 static int on_nvlan(const char *name, const char *value, enum env_op op, 281 int flags) 282 { 283 if (flags & H_PROGRAMMATIC) 284 return 0; 285 286 net_native_vlan = string_to_vlan(value); 287 288 return 0; 289 } 290 U_BOOT_ENV_CALLBACK(nvlan, on_nvlan); 291 292 static int on_vlan(const char *name, const char *value, enum env_op op, 293 int flags) 294 { 295 if (flags & H_PROGRAMMATIC) 296 return 0; 297 298 net_our_vlan = string_to_vlan(value); 299 300 return 0; 301 } 302 U_BOOT_ENV_CALLBACK(vlan, on_vlan); 303 304 #if defined(CONFIG_CMD_DNS) 305 static int on_dnsip(const char *name, const char *value, enum env_op op, 306 int flags) 307 { 308 if (flags & H_PROGRAMMATIC) 309 return 0; 310 311 net_dns_server = string_to_ip(value); 312 313 return 0; 314 } 315 U_BOOT_ENV_CALLBACK(dnsip, on_dnsip); 316 #endif 317 318 /* 319 * Check if autoload is enabled. If so, use either NFS or TFTP to download 320 * the boot file. 321 */ 322 void net_auto_load(void) 323 { 324 #if defined(CONFIG_CMD_NFS) 325 const char *s = env_get("autoload"); 326 327 if (s != NULL && strcmp(s, "NFS") == 0) { 328 /* 329 * Use NFS to load the bootfile. 330 */ 331 nfs_start(); 332 return; 333 } 334 #endif 335 if (env_get_yesno("autoload") == 0) { 336 /* 337 * Just use BOOTP/RARP to configure system; 338 * Do not use TFTP to load the bootfile. 339 */ 340 net_set_state(NETLOOP_SUCCESS); 341 return; 342 } 343 tftp_start(TFTPGET); 344 } 345 346 static void net_init_loop(void) 347 { 348 if (eth_get_dev()) 349 memcpy(net_ethaddr, eth_get_ethaddr(), 6); 350 351 return; 352 } 353 354 static void net_clear_handlers(void) 355 { 356 net_set_udp_handler(NULL); 357 net_set_arp_handler(NULL); 358 net_set_timeout_handler(0, NULL); 359 } 360 361 static void net_cleanup_loop(void) 362 { 363 net_clear_handlers(); 364 } 365 366 void net_init(void) 367 { 368 static int first_call = 1; 369 370 if (first_call) { 371 /* 372 * Setup packet buffers, aligned correctly. 373 */ 374 int i; 375 376 net_tx_packet = &net_pkt_buf[0] + (PKTALIGN - 1); 377 net_tx_packet -= (ulong)net_tx_packet % PKTALIGN; 378 for (i = 0; i < PKTBUFSRX; i++) { 379 net_rx_packets[i] = net_tx_packet + 380 (i + 1) * PKTSIZE_ALIGN; 381 } 382 arp_init(); 383 net_clear_handlers(); 384 385 /* Only need to setup buffer pointers once. */ 386 first_call = 0; 387 } 388 389 net_init_loop(); 390 } 391 392 /**********************************************************************/ 393 /* 394 * Main network processing loop. 395 */ 396 397 int net_loop(enum proto_t protocol) 398 { 399 int ret = -EINVAL; 400 401 net_restarted = 0; 402 net_dev_exists = 0; 403 net_try_count = 1; 404 debug_cond(DEBUG_INT_STATE, "--- net_loop Entry\n"); 405 406 bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start"); 407 net_init(); 408 if (eth_is_on_demand_init() || protocol != NETCONS) { 409 eth_halt(); 410 eth_set_current(); 411 ret = eth_init(); 412 if (ret < 0) { 413 eth_halt(); 414 return ret; 415 } 416 } else { 417 eth_init_state_only(); 418 } 419 restart: 420 #ifdef CONFIG_USB_KEYBOARD 421 net_busy_flag = 0; 422 #endif 423 net_set_state(NETLOOP_CONTINUE); 424 425 /* 426 * Start the ball rolling with the given start function. From 427 * here on, this code is a state machine driven by received 428 * packets and timer events. 429 */ 430 debug_cond(DEBUG_INT_STATE, "--- net_loop Init\n"); 431 net_init_loop(); 432 433 switch (net_check_prereq(protocol)) { 434 case 1: 435 /* network not configured */ 436 eth_halt(); 437 return -ENODEV; 438 439 case 2: 440 /* network device not configured */ 441 break; 442 443 case 0: 444 net_dev_exists = 1; 445 net_boot_file_size = 0; 446 switch (protocol) { 447 case TFTPGET: 448 #ifdef CONFIG_CMD_TFTPPUT 449 case TFTPPUT: 450 #endif 451 /* always use ARP to get server ethernet address */ 452 tftp_start(protocol); 453 break; 454 #ifdef CONFIG_CMD_TFTPSRV 455 case TFTPSRV: 456 tftp_start_server(); 457 break; 458 #endif 459 #ifdef CONFIG_UDP_FUNCTION_FASTBOOT 460 case FASTBOOT: 461 fastboot_start_server(); 462 break; 463 #endif 464 #if defined(CONFIG_CMD_DHCP) 465 case DHCP: 466 bootp_reset(); 467 net_ip.s_addr = 0; 468 dhcp_request(); /* Basically same as BOOTP */ 469 break; 470 #endif 471 472 case BOOTP: 473 bootp_reset(); 474 net_ip.s_addr = 0; 475 bootp_request(); 476 break; 477 478 #if defined(CONFIG_CMD_RARP) 479 case RARP: 480 rarp_try = 0; 481 net_ip.s_addr = 0; 482 rarp_request(); 483 break; 484 #endif 485 #if defined(CONFIG_CMD_PING) 486 case PING: 487 ping_start(); 488 break; 489 #endif 490 #if defined(CONFIG_CMD_NFS) 491 case NFS: 492 nfs_start(); 493 break; 494 #endif 495 #if defined(CONFIG_CMD_CDP) 496 case CDP: 497 cdp_start(); 498 break; 499 #endif 500 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD) 501 case NETCONS: 502 nc_start(); 503 break; 504 #endif 505 #if defined(CONFIG_CMD_SNTP) 506 case SNTP: 507 sntp_start(); 508 break; 509 #endif 510 #if defined(CONFIG_CMD_DNS) 511 case DNS: 512 dns_start(); 513 break; 514 #endif 515 #if defined(CONFIG_CMD_LINK_LOCAL) 516 case LINKLOCAL: 517 link_local_start(); 518 break; 519 #endif 520 default: 521 break; 522 } 523 524 break; 525 } 526 527 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 528 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ 529 defined(CONFIG_LED_STATUS) && \ 530 defined(CONFIG_LED_STATUS_RED) 531 /* 532 * Echo the inverted link state to the fault LED. 533 */ 534 if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) 535 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_OFF); 536 else 537 status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_ON); 538 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 539 #endif /* CONFIG_MII, ... */ 540 #ifdef CONFIG_USB_KEYBOARD 541 net_busy_flag = 1; 542 #endif 543 544 /* 545 * Main packet reception loop. Loop receiving packets until 546 * someone sets `net_state' to a state that terminates. 547 */ 548 for (;;) { 549 WATCHDOG_RESET(); 550 #ifdef CONFIG_SHOW_ACTIVITY 551 show_activity(1); 552 #endif 553 if (arp_timeout_check() > 0) 554 time_start = get_timer(0); 555 556 /* 557 * Check the ethernet for a new packet. The ethernet 558 * receive routine will process it. 559 * Most drivers return the most recent packet size, but not 560 * errors that may have happened. 561 */ 562 eth_rx(); 563 564 /* 565 * Abort if ctrl-c was pressed. 566 */ 567 if (ctrlc()) { 568 /* cancel any ARP that may not have completed */ 569 net_arp_wait_packet_ip.s_addr = 0; 570 571 net_cleanup_loop(); 572 eth_halt(); 573 /* Invalidate the last protocol */ 574 eth_set_last_protocol(BOOTP); 575 576 puts("\nAbort\n"); 577 /* include a debug print as well incase the debug 578 messages are directed to stderr */ 579 debug_cond(DEBUG_INT_STATE, "--- net_loop Abort!\n"); 580 ret = -EINTR; 581 goto done; 582 } 583 584 /* 585 * Check for a timeout, and run the timeout handler 586 * if we have one. 587 */ 588 if (time_handler && 589 ((get_timer(0) - time_start) > time_delta)) { 590 thand_f *x; 591 592 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 593 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ 594 defined(CONFIG_LED_STATUS) && \ 595 defined(CONFIG_LED_STATUS_RED) 596 /* 597 * Echo the inverted link state to the fault LED. 598 */ 599 if (miiphy_link(eth_get_dev()->name, 600 CONFIG_SYS_FAULT_MII_ADDR)) 601 status_led_set(CONFIG_LED_STATUS_RED, 602 CONFIG_LED_STATUS_OFF); 603 else 604 status_led_set(CONFIG_LED_STATUS_RED, 605 CONFIG_LED_STATUS_ON); 606 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 607 #endif /* CONFIG_MII, ... */ 608 debug_cond(DEBUG_INT_STATE, "--- net_loop timeout\n"); 609 x = time_handler; 610 time_handler = (thand_f *)0; 611 (*x)(); 612 } 613 614 if (net_state == NETLOOP_FAIL) 615 ret = net_start_again(); 616 617 switch (net_state) { 618 case NETLOOP_RESTART: 619 net_restarted = 1; 620 goto restart; 621 622 case NETLOOP_SUCCESS: 623 net_cleanup_loop(); 624 if (net_boot_file_size > 0) { 625 printf("Bytes transferred = %d (%x hex)\n", 626 net_boot_file_size, net_boot_file_size); 627 env_set_hex("filesize", net_boot_file_size); 628 env_set_hex("fileaddr", load_addr); 629 } 630 if (protocol != NETCONS) 631 eth_halt(); 632 else 633 eth_halt_state_only(); 634 635 eth_set_last_protocol(protocol); 636 637 ret = net_boot_file_size; 638 debug_cond(DEBUG_INT_STATE, "--- net_loop Success!\n"); 639 goto done; 640 641 case NETLOOP_FAIL: 642 net_cleanup_loop(); 643 /* Invalidate the last protocol */ 644 eth_set_last_protocol(BOOTP); 645 debug_cond(DEBUG_INT_STATE, "--- net_loop Fail!\n"); 646 goto done; 647 648 case NETLOOP_CONTINUE: 649 continue; 650 } 651 } 652 653 done: 654 #ifdef CONFIG_USB_KEYBOARD 655 net_busy_flag = 0; 656 #endif 657 #ifdef CONFIG_CMD_TFTPPUT 658 /* Clear out the handlers */ 659 net_set_udp_handler(NULL); 660 net_set_icmp_handler(NULL); 661 #endif 662 return ret; 663 } 664 665 /**********************************************************************/ 666 667 static void start_again_timeout_handler(void) 668 { 669 net_set_state(NETLOOP_RESTART); 670 } 671 672 int net_start_again(void) 673 { 674 char *nretry; 675 int retry_forever = 0; 676 unsigned long retrycnt = 0; 677 int ret; 678 679 nretry = env_get("netretry"); 680 if (nretry) { 681 if (!strcmp(nretry, "yes")) 682 retry_forever = 1; 683 else if (!strcmp(nretry, "no")) 684 retrycnt = 0; 685 else if (!strcmp(nretry, "once")) 686 retrycnt = 1; 687 else 688 retrycnt = simple_strtoul(nretry, NULL, 0); 689 } else { 690 retrycnt = 0; 691 retry_forever = 0; 692 } 693 694 if ((!retry_forever) && (net_try_count >= retrycnt)) { 695 eth_halt(); 696 net_set_state(NETLOOP_FAIL); 697 /* 698 * We don't provide a way for the protocol to return an error, 699 * but this is almost always the reason. 700 */ 701 return -ETIMEDOUT; 702 } 703 704 net_try_count++; 705 706 eth_halt(); 707 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER) 708 eth_try_another(!net_restarted); 709 #endif 710 ret = eth_init(); 711 if (net_restart_wrap) { 712 net_restart_wrap = 0; 713 if (net_dev_exists) { 714 net_set_timeout_handler(10000UL, 715 start_again_timeout_handler); 716 net_set_udp_handler(NULL); 717 } else { 718 net_set_state(NETLOOP_FAIL); 719 } 720 } else { 721 net_set_state(NETLOOP_RESTART); 722 } 723 return ret; 724 } 725 726 /**********************************************************************/ 727 /* 728 * Miscelaneous bits. 729 */ 730 731 static void dummy_handler(uchar *pkt, unsigned dport, 732 struct in_addr sip, unsigned sport, 733 unsigned len) 734 { 735 } 736 737 rxhand_f *net_get_udp_handler(void) 738 { 739 return udp_packet_handler; 740 } 741 742 void net_set_udp_handler(rxhand_f *f) 743 { 744 debug_cond(DEBUG_INT_STATE, "--- net_loop UDP handler set (%p)\n", f); 745 if (f == NULL) 746 udp_packet_handler = dummy_handler; 747 else 748 udp_packet_handler = f; 749 } 750 751 rxhand_f *net_get_arp_handler(void) 752 { 753 return arp_packet_handler; 754 } 755 756 void net_set_arp_handler(rxhand_f *f) 757 { 758 debug_cond(DEBUG_INT_STATE, "--- net_loop ARP handler set (%p)\n", f); 759 if (f == NULL) 760 arp_packet_handler = dummy_handler; 761 else 762 arp_packet_handler = f; 763 } 764 765 #ifdef CONFIG_CMD_TFTPPUT 766 void net_set_icmp_handler(rxhand_icmp_f *f) 767 { 768 packet_icmp_handler = f; 769 } 770 #endif 771 772 void net_set_timeout_handler(ulong iv, thand_f *f) 773 { 774 if (iv == 0) { 775 debug_cond(DEBUG_INT_STATE, 776 "--- net_loop timeout handler cancelled\n"); 777 time_handler = (thand_f *)0; 778 } else { 779 debug_cond(DEBUG_INT_STATE, 780 "--- net_loop timeout handler set (%p)\n", f); 781 time_handler = f; 782 time_start = get_timer(0); 783 time_delta = iv * CONFIG_SYS_HZ / 1000; 784 } 785 } 786 787 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport, 788 int payload_len) 789 { 790 uchar *pkt; 791 int eth_hdr_size; 792 int pkt_hdr_size; 793 794 /* make sure the net_tx_packet is initialized (net_init() was called) */ 795 assert(net_tx_packet != NULL); 796 if (net_tx_packet == NULL) 797 return -1; 798 799 /* convert to new style broadcast */ 800 if (dest.s_addr == 0) 801 dest.s_addr = 0xFFFFFFFF; 802 803 /* if broadcast, make the ether address a broadcast and don't do ARP */ 804 if (dest.s_addr == 0xFFFFFFFF) 805 ether = (uchar *)net_bcast_ethaddr; 806 807 pkt = (uchar *)net_tx_packet; 808 809 eth_hdr_size = net_set_ether(pkt, ether, PROT_IP); 810 pkt += eth_hdr_size; 811 net_set_udp_header(pkt, dest, dport, sport, payload_len); 812 pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE; 813 814 /* if MAC address was not discovered yet, do an ARP request */ 815 if (memcmp(ether, net_null_ethaddr, 6) == 0) { 816 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest); 817 818 /* save the ip and eth addr for the packet to send after arp */ 819 net_arp_wait_packet_ip = dest; 820 arp_wait_packet_ethaddr = ether; 821 822 /* size of the waiting packet */ 823 arp_wait_tx_packet_size = pkt_hdr_size + payload_len; 824 825 /* and do the ARP request */ 826 arp_wait_try = 1; 827 arp_wait_timer_start = get_timer(0); 828 arp_request(); 829 return 1; /* waiting */ 830 } else { 831 debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n", 832 &dest, ether); 833 net_send_packet(net_tx_packet, pkt_hdr_size + payload_len); 834 return 0; /* transmitted */ 835 } 836 } 837 838 #ifdef CONFIG_IP_DEFRAG 839 /* 840 * This function collects fragments in a single packet, according 841 * to the algorithm in RFC815. It returns NULL or the pointer to 842 * a complete packet, in static storage 843 */ 844 #ifndef CONFIG_NET_MAXDEFRAG 845 #define CONFIG_NET_MAXDEFRAG 16384 846 #endif 847 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG) 848 849 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE) 850 851 /* 852 * this is the packet being assembled, either data or frag control. 853 * Fragments go by 8 bytes, so this union must be 8 bytes long 854 */ 855 struct hole { 856 /* first_byte is address of this structure */ 857 u16 last_byte; /* last byte in this hole + 1 (begin of next hole) */ 858 u16 next_hole; /* index of next (in 8-b blocks), 0 == none */ 859 u16 prev_hole; /* index of prev, 0 == none */ 860 u16 unused; 861 }; 862 863 static struct ip_udp_hdr *__net_defragment(struct ip_udp_hdr *ip, int *lenp) 864 { 865 static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN); 866 static u16 first_hole, total_len; 867 struct hole *payload, *thisfrag, *h, *newh; 868 struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff; 869 uchar *indata = (uchar *)ip; 870 int offset8, start, len, done = 0; 871 u16 ip_off = ntohs(ip->ip_off); 872 873 /* payload starts after IP header, this fragment is in there */ 874 payload = (struct hole *)(pkt_buff + IP_HDR_SIZE); 875 offset8 = (ip_off & IP_OFFS); 876 thisfrag = payload + offset8; 877 start = offset8 * 8; 878 len = ntohs(ip->ip_len) - IP_HDR_SIZE; 879 880 if (start + len > IP_MAXUDP) /* fragment extends too far */ 881 return NULL; 882 883 if (!total_len || localip->ip_id != ip->ip_id) { 884 /* new (or different) packet, reset structs */ 885 total_len = 0xffff; 886 payload[0].last_byte = ~0; 887 payload[0].next_hole = 0; 888 payload[0].prev_hole = 0; 889 first_hole = 0; 890 /* any IP header will work, copy the first we received */ 891 memcpy(localip, ip, IP_HDR_SIZE); 892 } 893 894 /* 895 * What follows is the reassembly algorithm. We use the payload 896 * array as a linked list of hole descriptors, as each hole starts 897 * at a multiple of 8 bytes. However, last byte can be whatever value, 898 * so it is represented as byte count, not as 8-byte blocks. 899 */ 900 901 h = payload + first_hole; 902 while (h->last_byte < start) { 903 if (!h->next_hole) { 904 /* no hole that far away */ 905 return NULL; 906 } 907 h = payload + h->next_hole; 908 } 909 910 /* last fragment may be 1..7 bytes, the "+7" forces acceptance */ 911 if (offset8 + ((len + 7) / 8) <= h - payload) { 912 /* no overlap with holes (dup fragment?) */ 913 return NULL; 914 } 915 916 if (!(ip_off & IP_FLAGS_MFRAG)) { 917 /* no more fragmentss: truncate this (last) hole */ 918 total_len = start + len; 919 h->last_byte = start + len; 920 } 921 922 /* 923 * There is some overlap: fix the hole list. This code doesn't 924 * deal with a fragment that overlaps with two different holes 925 * (thus being a superset of a previously-received fragment). 926 */ 927 928 if ((h >= thisfrag) && (h->last_byte <= start + len)) { 929 /* complete overlap with hole: remove hole */ 930 if (!h->prev_hole && !h->next_hole) { 931 /* last remaining hole */ 932 done = 1; 933 } else if (!h->prev_hole) { 934 /* first hole */ 935 first_hole = h->next_hole; 936 payload[h->next_hole].prev_hole = 0; 937 } else if (!h->next_hole) { 938 /* last hole */ 939 payload[h->prev_hole].next_hole = 0; 940 } else { 941 /* in the middle of the list */ 942 payload[h->next_hole].prev_hole = h->prev_hole; 943 payload[h->prev_hole].next_hole = h->next_hole; 944 } 945 946 } else if (h->last_byte <= start + len) { 947 /* overlaps with final part of the hole: shorten this hole */ 948 h->last_byte = start; 949 950 } else if (h >= thisfrag) { 951 /* overlaps with initial part of the hole: move this hole */ 952 newh = thisfrag + (len / 8); 953 *newh = *h; 954 h = newh; 955 if (h->next_hole) 956 payload[h->next_hole].prev_hole = (h - payload); 957 if (h->prev_hole) 958 payload[h->prev_hole].next_hole = (h - payload); 959 else 960 first_hole = (h - payload); 961 962 } else { 963 /* fragment sits in the middle: split the hole */ 964 newh = thisfrag + (len / 8); 965 *newh = *h; 966 h->last_byte = start; 967 h->next_hole = (newh - payload); 968 newh->prev_hole = (h - payload); 969 if (newh->next_hole) 970 payload[newh->next_hole].prev_hole = (newh - payload); 971 } 972 973 /* finally copy this fragment and possibly return whole packet */ 974 memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len); 975 if (!done) 976 return NULL; 977 978 localip->ip_len = htons(total_len); 979 *lenp = total_len + IP_HDR_SIZE; 980 return localip; 981 } 982 983 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip, 984 int *lenp) 985 { 986 u16 ip_off = ntohs(ip->ip_off); 987 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) 988 return ip; /* not a fragment */ 989 return __net_defragment(ip, lenp); 990 } 991 992 #else /* !CONFIG_IP_DEFRAG */ 993 994 static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip, 995 int *lenp) 996 { 997 u16 ip_off = ntohs(ip->ip_off); 998 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) 999 return ip; /* not a fragment */ 1000 return NULL; 1001 } 1002 #endif 1003 1004 /** 1005 * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently 1006 * drop others. 1007 * 1008 * @parma ip IP packet containing the ICMP 1009 */ 1010 static void receive_icmp(struct ip_udp_hdr *ip, int len, 1011 struct in_addr src_ip, struct ethernet_hdr *et) 1012 { 1013 struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src; 1014 1015 switch (icmph->type) { 1016 case ICMP_REDIRECT: 1017 if (icmph->code != ICMP_REDIR_HOST) 1018 return; 1019 printf(" ICMP Host Redirect to %pI4 ", 1020 &icmph->un.gateway); 1021 break; 1022 default: 1023 #if defined(CONFIG_CMD_PING) 1024 ping_receive(et, ip, len); 1025 #endif 1026 #ifdef CONFIG_CMD_TFTPPUT 1027 if (packet_icmp_handler) 1028 packet_icmp_handler(icmph->type, icmph->code, 1029 ntohs(ip->udp_dst), src_ip, 1030 ntohs(ip->udp_src), icmph->un.data, 1031 ntohs(ip->udp_len)); 1032 #endif 1033 break; 1034 } 1035 } 1036 1037 void net_process_received_packet(uchar *in_packet, int len) 1038 { 1039 struct ethernet_hdr *et; 1040 struct ip_udp_hdr *ip; 1041 struct in_addr dst_ip; 1042 struct in_addr src_ip; 1043 int eth_proto; 1044 #if defined(CONFIG_CMD_CDP) 1045 int iscdp; 1046 #endif 1047 ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid; 1048 1049 debug_cond(DEBUG_NET_PKT, "packet received\n"); 1050 1051 net_rx_packet = in_packet; 1052 net_rx_packet_len = len; 1053 et = (struct ethernet_hdr *)in_packet; 1054 1055 /* too small packet? */ 1056 if (len < ETHER_HDR_SIZE) 1057 return; 1058 1059 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER) 1060 if (push_packet) { 1061 (*push_packet)(in_packet, len); 1062 return; 1063 } 1064 #endif 1065 1066 #if defined(CONFIG_CMD_CDP) 1067 /* keep track if packet is CDP */ 1068 iscdp = is_cdp_packet(et->et_dest); 1069 #endif 1070 1071 myvlanid = ntohs(net_our_vlan); 1072 if (myvlanid == (ushort)-1) 1073 myvlanid = VLAN_NONE; 1074 mynvlanid = ntohs(net_native_vlan); 1075 if (mynvlanid == (ushort)-1) 1076 mynvlanid = VLAN_NONE; 1077 1078 eth_proto = ntohs(et->et_protlen); 1079 1080 if (eth_proto < 1514) { 1081 struct e802_hdr *et802 = (struct e802_hdr *)et; 1082 /* 1083 * Got a 802.2 packet. Check the other protocol field. 1084 * XXX VLAN over 802.2+SNAP not implemented! 1085 */ 1086 eth_proto = ntohs(et802->et_prot); 1087 1088 ip = (struct ip_udp_hdr *)(in_packet + E802_HDR_SIZE); 1089 len -= E802_HDR_SIZE; 1090 1091 } else if (eth_proto != PROT_VLAN) { /* normal packet */ 1092 ip = (struct ip_udp_hdr *)(in_packet + ETHER_HDR_SIZE); 1093 len -= ETHER_HDR_SIZE; 1094 1095 } else { /* VLAN packet */ 1096 struct vlan_ethernet_hdr *vet = 1097 (struct vlan_ethernet_hdr *)et; 1098 1099 debug_cond(DEBUG_NET_PKT, "VLAN packet received\n"); 1100 1101 /* too small packet? */ 1102 if (len < VLAN_ETHER_HDR_SIZE) 1103 return; 1104 1105 /* if no VLAN active */ 1106 if ((ntohs(net_our_vlan) & VLAN_IDMASK) == VLAN_NONE 1107 #if defined(CONFIG_CMD_CDP) 1108 && iscdp == 0 1109 #endif 1110 ) 1111 return; 1112 1113 cti = ntohs(vet->vet_tag); 1114 vlanid = cti & VLAN_IDMASK; 1115 eth_proto = ntohs(vet->vet_type); 1116 1117 ip = (struct ip_udp_hdr *)(in_packet + VLAN_ETHER_HDR_SIZE); 1118 len -= VLAN_ETHER_HDR_SIZE; 1119 } 1120 1121 debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto); 1122 1123 #if defined(CONFIG_CMD_CDP) 1124 if (iscdp) { 1125 cdp_receive((uchar *)ip, len); 1126 return; 1127 } 1128 #endif 1129 1130 if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) { 1131 if (vlanid == VLAN_NONE) 1132 vlanid = (mynvlanid & VLAN_IDMASK); 1133 /* not matched? */ 1134 if (vlanid != (myvlanid & VLAN_IDMASK)) 1135 return; 1136 } 1137 1138 switch (eth_proto) { 1139 case PROT_ARP: 1140 arp_receive(et, ip, len); 1141 break; 1142 1143 #ifdef CONFIG_CMD_RARP 1144 case PROT_RARP: 1145 rarp_receive(ip, len); 1146 break; 1147 #endif 1148 case PROT_IP: 1149 debug_cond(DEBUG_NET_PKT, "Got IP\n"); 1150 /* Before we start poking the header, make sure it is there */ 1151 if (len < IP_UDP_HDR_SIZE) { 1152 debug("len bad %d < %lu\n", len, 1153 (ulong)IP_UDP_HDR_SIZE); 1154 return; 1155 } 1156 /* Check the packet length */ 1157 if (len < ntohs(ip->ip_len)) { 1158 debug("len bad %d < %d\n", len, ntohs(ip->ip_len)); 1159 return; 1160 } 1161 len = ntohs(ip->ip_len); 1162 debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n", 1163 len, ip->ip_hl_v & 0xff); 1164 1165 /* Can't deal with anything except IPv4 */ 1166 if ((ip->ip_hl_v & 0xf0) != 0x40) 1167 return; 1168 /* Can't deal with IP options (headers != 20 bytes) */ 1169 if ((ip->ip_hl_v & 0x0f) > 0x05) 1170 return; 1171 /* Check the Checksum of the header */ 1172 if (!ip_checksum_ok((uchar *)ip, IP_HDR_SIZE)) { 1173 debug("checksum bad\n"); 1174 return; 1175 } 1176 /* If it is not for us, ignore it */ 1177 dst_ip = net_read_ip(&ip->ip_dst); 1178 if (net_ip.s_addr && dst_ip.s_addr != net_ip.s_addr && 1179 dst_ip.s_addr != 0xFFFFFFFF) { 1180 #ifdef CONFIG_MCAST_TFTP 1181 if (net_mcast_addr != dst_ip) 1182 #endif 1183 return; 1184 } 1185 /* Read source IP address for later use */ 1186 src_ip = net_read_ip(&ip->ip_src); 1187 /* 1188 * The function returns the unchanged packet if it's not 1189 * a fragment, and either the complete packet or NULL if 1190 * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL) 1191 */ 1192 ip = net_defragment(ip, &len); 1193 if (!ip) 1194 return; 1195 /* 1196 * watch for ICMP host redirects 1197 * 1198 * There is no real handler code (yet). We just watch 1199 * for ICMP host redirect messages. In case anybody 1200 * sees these messages: please contact me 1201 * (wd@denx.de), or - even better - send me the 1202 * necessary fixes :-) 1203 * 1204 * Note: in all cases where I have seen this so far 1205 * it was a problem with the router configuration, 1206 * for instance when a router was configured in the 1207 * BOOTP reply, but the TFTP server was on the same 1208 * subnet. So this is probably a warning that your 1209 * configuration might be wrong. But I'm not really 1210 * sure if there aren't any other situations. 1211 * 1212 * Simon Glass <sjg@chromium.org>: We get an ICMP when 1213 * we send a tftp packet to a dead connection, or when 1214 * there is no server at the other end. 1215 */ 1216 if (ip->ip_p == IPPROTO_ICMP) { 1217 receive_icmp(ip, len, src_ip, et); 1218 return; 1219 } else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */ 1220 return; 1221 } 1222 1223 debug_cond(DEBUG_DEV_PKT, 1224 "received UDP (to=%pI4, from=%pI4, len=%d)\n", 1225 &dst_ip, &src_ip, len); 1226 1227 #ifdef CONFIG_UDP_CHECKSUM 1228 if (ip->udp_xsum != 0) { 1229 ulong xsum; 1230 ushort *sumptr; 1231 ushort sumlen; 1232 1233 xsum = ip->ip_p; 1234 xsum += (ntohs(ip->udp_len)); 1235 xsum += (ntohl(ip->ip_src.s_addr) >> 16) & 0x0000ffff; 1236 xsum += (ntohl(ip->ip_src.s_addr) >> 0) & 0x0000ffff; 1237 xsum += (ntohl(ip->ip_dst.s_addr) >> 16) & 0x0000ffff; 1238 xsum += (ntohl(ip->ip_dst.s_addr) >> 0) & 0x0000ffff; 1239 1240 sumlen = ntohs(ip->udp_len); 1241 sumptr = (ushort *)&(ip->udp_src); 1242 1243 while (sumlen > 1) { 1244 ushort sumdata; 1245 1246 sumdata = *sumptr++; 1247 xsum += ntohs(sumdata); 1248 sumlen -= 2; 1249 } 1250 if (sumlen > 0) { 1251 ushort sumdata; 1252 1253 sumdata = *(unsigned char *)sumptr; 1254 sumdata = (sumdata << 8) & 0xff00; 1255 xsum += sumdata; 1256 } 1257 while ((xsum >> 16) != 0) { 1258 xsum = (xsum & 0x0000ffff) + 1259 ((xsum >> 16) & 0x0000ffff); 1260 } 1261 if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) { 1262 printf(" UDP wrong checksum %08lx %08x\n", 1263 xsum, ntohs(ip->udp_xsum)); 1264 return; 1265 } 1266 } 1267 #endif 1268 1269 #if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD) 1270 nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE, 1271 src_ip, 1272 ntohs(ip->udp_dst), 1273 ntohs(ip->udp_src), 1274 ntohs(ip->udp_len) - UDP_HDR_SIZE); 1275 #endif 1276 /* 1277 * IP header OK. Pass the packet to the current handler. 1278 */ 1279 (*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE, 1280 ntohs(ip->udp_dst), 1281 src_ip, 1282 ntohs(ip->udp_src), 1283 ntohs(ip->udp_len) - UDP_HDR_SIZE); 1284 break; 1285 } 1286 } 1287 1288 /**********************************************************************/ 1289 1290 static int net_check_prereq(enum proto_t protocol) 1291 { 1292 switch (protocol) { 1293 /* Fall through */ 1294 #if defined(CONFIG_CMD_PING) 1295 case PING: 1296 if (net_ping_ip.s_addr == 0) { 1297 puts("*** ERROR: ping address not given\n"); 1298 return 1; 1299 } 1300 goto common; 1301 #endif 1302 #if defined(CONFIG_CMD_SNTP) 1303 case SNTP: 1304 if (net_ntp_server.s_addr == 0) { 1305 puts("*** ERROR: NTP server address not given\n"); 1306 return 1; 1307 } 1308 goto common; 1309 #endif 1310 #if defined(CONFIG_CMD_DNS) 1311 case DNS: 1312 if (net_dns_server.s_addr == 0) { 1313 puts("*** ERROR: DNS server address not given\n"); 1314 return 1; 1315 } 1316 goto common; 1317 #endif 1318 #if defined(CONFIG_CMD_NFS) 1319 case NFS: 1320 #endif 1321 /* Fall through */ 1322 case TFTPGET: 1323 case TFTPPUT: 1324 if (net_server_ip.s_addr == 0) { 1325 puts("*** ERROR: `serverip' not set\n"); 1326 return 1; 1327 } 1328 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \ 1329 defined(CONFIG_CMD_DNS) 1330 common: 1331 #endif 1332 /* Fall through */ 1333 1334 case NETCONS: 1335 case FASTBOOT: 1336 case TFTPSRV: 1337 if (net_ip.s_addr == 0) { 1338 puts("*** ERROR: `ipaddr' not set\n"); 1339 return 1; 1340 } 1341 /* Fall through */ 1342 1343 #ifdef CONFIG_CMD_RARP 1344 case RARP: 1345 #endif 1346 case BOOTP: 1347 case CDP: 1348 case DHCP: 1349 case LINKLOCAL: 1350 if (memcmp(net_ethaddr, "\0\0\0\0\0\0", 6) == 0) { 1351 int num = eth_get_dev_index(); 1352 1353 switch (num) { 1354 case -1: 1355 puts("*** ERROR: No ethernet found.\n"); 1356 return 1; 1357 case 0: 1358 puts("*** ERROR: `ethaddr' not set\n"); 1359 break; 1360 default: 1361 printf("*** ERROR: `eth%daddr' not set\n", 1362 num); 1363 break; 1364 } 1365 1366 net_start_again(); 1367 return 2; 1368 } 1369 /* Fall through */ 1370 default: 1371 return 0; 1372 } 1373 return 0; /* OK */ 1374 } 1375 /**********************************************************************/ 1376 1377 int 1378 net_eth_hdr_size(void) 1379 { 1380 ushort myvlanid; 1381 1382 myvlanid = ntohs(net_our_vlan); 1383 if (myvlanid == (ushort)-1) 1384 myvlanid = VLAN_NONE; 1385 1386 return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : 1387 VLAN_ETHER_HDR_SIZE; 1388 } 1389 1390 int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot) 1391 { 1392 struct ethernet_hdr *et = (struct ethernet_hdr *)xet; 1393 ushort myvlanid; 1394 1395 myvlanid = ntohs(net_our_vlan); 1396 if (myvlanid == (ushort)-1) 1397 myvlanid = VLAN_NONE; 1398 1399 memcpy(et->et_dest, dest_ethaddr, 6); 1400 memcpy(et->et_src, net_ethaddr, 6); 1401 if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) { 1402 et->et_protlen = htons(prot); 1403 return ETHER_HDR_SIZE; 1404 } else { 1405 struct vlan_ethernet_hdr *vet = 1406 (struct vlan_ethernet_hdr *)xet; 1407 1408 vet->vet_vlan_type = htons(PROT_VLAN); 1409 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK)); 1410 vet->vet_type = htons(prot); 1411 return VLAN_ETHER_HDR_SIZE; 1412 } 1413 } 1414 1415 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot) 1416 { 1417 ushort protlen; 1418 1419 memcpy(et->et_dest, addr, 6); 1420 memcpy(et->et_src, net_ethaddr, 6); 1421 protlen = ntohs(et->et_protlen); 1422 if (protlen == PROT_VLAN) { 1423 struct vlan_ethernet_hdr *vet = 1424 (struct vlan_ethernet_hdr *)et; 1425 vet->vet_type = htons(prot); 1426 return VLAN_ETHER_HDR_SIZE; 1427 } else if (protlen > 1514) { 1428 et->et_protlen = htons(prot); 1429 return ETHER_HDR_SIZE; 1430 } else { 1431 /* 802.2 + SNAP */ 1432 struct e802_hdr *et802 = (struct e802_hdr *)et; 1433 et802->et_prot = htons(prot); 1434 return E802_HDR_SIZE; 1435 } 1436 } 1437 1438 void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source) 1439 { 1440 struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt; 1441 1442 /* 1443 * Construct an IP header. 1444 */ 1445 /* IP_HDR_SIZE / 4 (not including UDP) */ 1446 ip->ip_hl_v = 0x45; 1447 ip->ip_tos = 0; 1448 ip->ip_len = htons(IP_HDR_SIZE); 1449 ip->ip_id = htons(net_ip_id++); 1450 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ 1451 ip->ip_ttl = 255; 1452 ip->ip_sum = 0; 1453 /* already in network byte order */ 1454 net_copy_ip((void *)&ip->ip_src, &source); 1455 /* already in network byte order */ 1456 net_copy_ip((void *)&ip->ip_dst, &dest); 1457 } 1458 1459 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport, 1460 int len) 1461 { 1462 struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt; 1463 1464 /* 1465 * If the data is an odd number of bytes, zero the 1466 * byte after the last byte so that the checksum 1467 * will work. 1468 */ 1469 if (len & 1) 1470 pkt[IP_UDP_HDR_SIZE + len] = 0; 1471 1472 net_set_ip_header(pkt, dest, net_ip); 1473 ip->ip_len = htons(IP_UDP_HDR_SIZE + len); 1474 ip->ip_p = IPPROTO_UDP; 1475 ip->ip_sum = compute_ip_checksum(ip, IP_HDR_SIZE); 1476 1477 ip->udp_src = htons(sport); 1478 ip->udp_dst = htons(dport); 1479 ip->udp_len = htons(UDP_HDR_SIZE + len); 1480 ip->udp_xsum = 0; 1481 } 1482 1483 void copy_filename(char *dst, const char *src, int size) 1484 { 1485 if (*src && (*src == '"')) { 1486 ++src; 1487 --size; 1488 } 1489 1490 while ((--size > 0) && *src && (*src != '"')) 1491 *dst++ = *src++; 1492 *dst = '\0'; 1493 } 1494 1495 #if defined(CONFIG_CMD_NFS) || \ 1496 defined(CONFIG_CMD_SNTP) || \ 1497 defined(CONFIG_CMD_DNS) 1498 /* 1499 * make port a little random (1024-17407) 1500 * This keeps the math somewhat trivial to compute, and seems to work with 1501 * all supported protocols/clients/servers 1502 */ 1503 unsigned int random_port(void) 1504 { 1505 return 1024 + (get_timer(0) % 0x4000); 1506 } 1507 #endif 1508 1509 void ip_to_string(struct in_addr x, char *s) 1510 { 1511 x.s_addr = ntohl(x.s_addr); 1512 sprintf(s, "%d.%d.%d.%d", 1513 (int) ((x.s_addr >> 24) & 0xff), 1514 (int) ((x.s_addr >> 16) & 0xff), 1515 (int) ((x.s_addr >> 8) & 0xff), 1516 (int) ((x.s_addr >> 0) & 0xff) 1517 ); 1518 } 1519 1520 void vlan_to_string(ushort x, char *s) 1521 { 1522 x = ntohs(x); 1523 1524 if (x == (ushort)-1) 1525 x = VLAN_NONE; 1526 1527 if (x == VLAN_NONE) 1528 strcpy(s, "none"); 1529 else 1530 sprintf(s, "%d", x & VLAN_IDMASK); 1531 } 1532 1533 ushort string_to_vlan(const char *s) 1534 { 1535 ushort id; 1536 1537 if (s == NULL) 1538 return htons(VLAN_NONE); 1539 1540 if (*s < '0' || *s > '9') 1541 id = VLAN_NONE; 1542 else 1543 id = (ushort)simple_strtoul(s, NULL, 10); 1544 1545 return htons(id); 1546 } 1547 1548 ushort env_get_vlan(char *var) 1549 { 1550 return string_to_vlan(env_get(var)); 1551 } 1552