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 <environment.h> 87 #include <net.h> 88 #if defined(CONFIG_STATUS_LED) 89 #include <miiphy.h> 90 #include <status_led.h> 91 #endif 92 #include <watchdog.h> 93 #include <linux/compiler.h> 94 #include "arp.h" 95 #include "bootp.h" 96 #include "cdp.h" 97 #if defined(CONFIG_CMD_DNS) 98 #include "dns.h" 99 #endif 100 #include "link_local.h" 101 #include "nfs.h" 102 #include "ping.h" 103 #include "rarp.h" 104 #if defined(CONFIG_CMD_SNTP) 105 #include "sntp.h" 106 #endif 107 #include "tftp.h" 108 109 DECLARE_GLOBAL_DATA_PTR; 110 111 /** BOOTP EXTENTIONS **/ 112 113 /* Our subnet mask (0=unknown) */ 114 IPaddr_t NetOurSubnetMask; 115 /* Our gateways IP address */ 116 IPaddr_t NetOurGatewayIP; 117 /* Our DNS IP address */ 118 IPaddr_t NetOurDNSIP; 119 #if defined(CONFIG_BOOTP_DNS2) 120 /* Our 2nd DNS IP address */ 121 IPaddr_t NetOurDNS2IP; 122 #endif 123 /* Our NIS domain */ 124 char NetOurNISDomain[32] = {0,}; 125 /* Our hostname */ 126 char NetOurHostName[32] = {0,}; 127 /* Our bootpath */ 128 char NetOurRootPath[64] = {0,}; 129 /* Our bootfile size in blocks */ 130 ushort NetBootFileSize; 131 132 #ifdef CONFIG_MCAST_TFTP /* Multicast TFTP */ 133 IPaddr_t Mcast_addr; 134 #endif 135 136 /** END OF BOOTP EXTENTIONS **/ 137 138 /* The actual transferred size of the bootfile (in bytes) */ 139 ulong NetBootFileXferSize; 140 /* Our ethernet address */ 141 uchar NetOurEther[6]; 142 /* Boot server enet address */ 143 uchar NetServerEther[6]; 144 /* Our IP addr (0 = unknown) */ 145 IPaddr_t NetOurIP; 146 /* Server IP addr (0 = unknown) */ 147 IPaddr_t NetServerIP; 148 /* Current receive packet */ 149 uchar *NetRxPacket; 150 /* Current rx packet length */ 151 int NetRxPacketLen; 152 /* IP packet ID */ 153 unsigned NetIPID; 154 /* Ethernet bcast address */ 155 uchar NetBcastAddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 156 uchar NetEtherNullAddr[6]; 157 #ifdef CONFIG_API 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 NetRestartWrap; 164 /* Network loop restarted */ 165 static int NetRestarted; 166 /* At least one device configured */ 167 static int NetDevExists; 168 169 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */ 170 /* default is without VLAN */ 171 ushort NetOurVLAN = 0xFFFF; 172 /* ditto */ 173 ushort NetOurNativeVLAN = 0xFFFF; 174 175 /* Boot File name */ 176 char BootFile[128]; 177 178 #if defined(CONFIG_CMD_SNTP) 179 /* NTP server IP address */ 180 IPaddr_t NetNtpServerIP; 181 /* offset time from UTC */ 182 int NetTimeOffset; 183 #endif 184 185 static uchar PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN]; 186 187 /* Receive packet */ 188 uchar *NetRxPackets[PKTBUFSRX]; 189 190 /* Current UDP RX packet handler */ 191 static rxhand_f *udp_packet_handler; 192 /* Current ARP RX packet handler */ 193 static rxhand_f *arp_packet_handler; 194 #ifdef CONFIG_CMD_TFTPPUT 195 /* Current ICMP rx handler */ 196 static rxhand_icmp_f *packet_icmp_handler; 197 #endif 198 /* Current timeout handler */ 199 static thand_f *timeHandler; 200 /* Time base value */ 201 static ulong timeStart; 202 /* Current timeout value */ 203 static ulong timeDelta; 204 /* THE transmit packet */ 205 uchar *NetTxPacket; 206 207 static int net_check_prereq(enum proto_t protocol); 208 209 static int NetTryCount; 210 211 int __maybe_unused net_busy_flag; 212 213 /**********************************************************************/ 214 215 static int on_bootfile(const char *name, const char *value, enum env_op op, 216 int flags) 217 { 218 switch (op) { 219 case env_op_create: 220 case env_op_overwrite: 221 copy_filename(BootFile, value, sizeof(BootFile)); 222 break; 223 default: 224 break; 225 } 226 227 return 0; 228 } 229 U_BOOT_ENV_CALLBACK(bootfile, on_bootfile); 230 231 /* 232 * Check if autoload is enabled. If so, use either NFS or TFTP to download 233 * the boot file. 234 */ 235 void net_auto_load(void) 236 { 237 #if defined(CONFIG_CMD_NFS) 238 const char *s = getenv("autoload"); 239 240 if (s != NULL && strcmp(s, "NFS") == 0) { 241 /* 242 * Use NFS to load the bootfile. 243 */ 244 NfsStart(); 245 return; 246 } 247 #endif 248 if (getenv_yesno("autoload") == 0) { 249 /* 250 * Just use BOOTP/RARP to configure system; 251 * Do not use TFTP to load the bootfile. 252 */ 253 net_set_state(NETLOOP_SUCCESS); 254 return; 255 } 256 TftpStart(TFTPGET); 257 } 258 259 static void NetInitLoop(void) 260 { 261 static int env_changed_id; 262 int env_id = get_env_id(); 263 264 /* update only when the environment has changed */ 265 if (env_changed_id != env_id) { 266 NetOurIP = getenv_IPaddr("ipaddr"); 267 NetOurGatewayIP = getenv_IPaddr("gatewayip"); 268 NetOurSubnetMask = getenv_IPaddr("netmask"); 269 NetServerIP = getenv_IPaddr("serverip"); 270 NetOurNativeVLAN = getenv_VLAN("nvlan"); 271 NetOurVLAN = getenv_VLAN("vlan"); 272 #if defined(CONFIG_CMD_DNS) 273 NetOurDNSIP = getenv_IPaddr("dnsip"); 274 #endif 275 env_changed_id = env_id; 276 } 277 if (eth_get_dev()) 278 memcpy(NetOurEther, eth_get_ethaddr(), 6); 279 280 return; 281 } 282 283 static void net_clear_handlers(void) 284 { 285 net_set_udp_handler(NULL); 286 net_set_arp_handler(NULL); 287 NetSetTimeout(0, NULL); 288 } 289 290 static void net_cleanup_loop(void) 291 { 292 net_clear_handlers(); 293 } 294 295 void net_init(void) 296 { 297 static int first_call = 1; 298 299 if (first_call) { 300 /* 301 * Setup packet buffers, aligned correctly. 302 */ 303 int i; 304 305 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1); 306 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN; 307 for (i = 0; i < PKTBUFSRX; i++) 308 NetRxPackets[i] = NetTxPacket + (i + 1) * PKTSIZE_ALIGN; 309 310 ArpInit(); 311 net_clear_handlers(); 312 313 /* Only need to setup buffer pointers once. */ 314 first_call = 0; 315 } 316 317 NetInitLoop(); 318 } 319 320 /**********************************************************************/ 321 /* 322 * Main network processing loop. 323 */ 324 325 int NetLoop(enum proto_t protocol) 326 { 327 int ret = -1; 328 329 NetRestarted = 0; 330 NetDevExists = 0; 331 NetTryCount = 1; 332 debug_cond(DEBUG_INT_STATE, "--- NetLoop Entry\n"); 333 334 bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start"); 335 net_init(); 336 if (eth_is_on_demand_init() || protocol != NETCONS) { 337 eth_halt(); 338 eth_set_current(); 339 if (eth_init() < 0) { 340 eth_halt(); 341 return -1; 342 } 343 } else 344 eth_init_state_only(); 345 346 restart: 347 #ifdef CONFIG_USB_KEYBOARD 348 net_busy_flag = 0; 349 #endif 350 net_set_state(NETLOOP_CONTINUE); 351 352 /* 353 * Start the ball rolling with the given start function. From 354 * here on, this code is a state machine driven by received 355 * packets and timer events. 356 */ 357 debug_cond(DEBUG_INT_STATE, "--- NetLoop Init\n"); 358 NetInitLoop(); 359 360 switch (net_check_prereq(protocol)) { 361 case 1: 362 /* network not configured */ 363 eth_halt(); 364 return -1; 365 366 case 2: 367 /* network device not configured */ 368 break; 369 370 case 0: 371 NetDevExists = 1; 372 NetBootFileXferSize = 0; 373 switch (protocol) { 374 case TFTPGET: 375 #ifdef CONFIG_CMD_TFTPPUT 376 case TFTPPUT: 377 #endif 378 /* always use ARP to get server ethernet address */ 379 TftpStart(protocol); 380 break; 381 #ifdef CONFIG_CMD_TFTPSRV 382 case TFTPSRV: 383 TftpStartServer(); 384 break; 385 #endif 386 #if defined(CONFIG_CMD_DHCP) 387 case DHCP: 388 BootpReset(); 389 NetOurIP = 0; 390 DhcpRequest(); /* Basically same as BOOTP */ 391 break; 392 #endif 393 394 case BOOTP: 395 BootpReset(); 396 NetOurIP = 0; 397 BootpRequest(); 398 break; 399 400 #if defined(CONFIG_CMD_RARP) 401 case RARP: 402 RarpTry = 0; 403 NetOurIP = 0; 404 RarpRequest(); 405 break; 406 #endif 407 #if defined(CONFIG_CMD_PING) 408 case PING: 409 ping_start(); 410 break; 411 #endif 412 #if defined(CONFIG_CMD_NFS) 413 case NFS: 414 NfsStart(); 415 break; 416 #endif 417 #if defined(CONFIG_CMD_CDP) 418 case CDP: 419 CDPStart(); 420 break; 421 #endif 422 #if defined (CONFIG_NETCONSOLE) && !(CONFIG_SPL_BUILD) 423 case NETCONS: 424 NcStart(); 425 break; 426 #endif 427 #if defined(CONFIG_CMD_SNTP) 428 case SNTP: 429 SntpStart(); 430 break; 431 #endif 432 #if defined(CONFIG_CMD_DNS) 433 case DNS: 434 DnsStart(); 435 break; 436 #endif 437 #if defined(CONFIG_CMD_LINK_LOCAL) 438 case LINKLOCAL: 439 link_local_start(); 440 break; 441 #endif 442 default: 443 break; 444 } 445 446 break; 447 } 448 449 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 450 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ 451 defined(CONFIG_STATUS_LED) && \ 452 defined(STATUS_LED_RED) 453 /* 454 * Echo the inverted link state to the fault LED. 455 */ 456 if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) 457 status_led_set(STATUS_LED_RED, STATUS_LED_OFF); 458 else 459 status_led_set(STATUS_LED_RED, STATUS_LED_ON); 460 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 461 #endif /* CONFIG_MII, ... */ 462 #ifdef CONFIG_USB_KEYBOARD 463 net_busy_flag = 1; 464 #endif 465 466 /* 467 * Main packet reception loop. Loop receiving packets until 468 * someone sets `net_state' to a state that terminates. 469 */ 470 for (;;) { 471 WATCHDOG_RESET(); 472 #ifdef CONFIG_SHOW_ACTIVITY 473 show_activity(1); 474 #endif 475 /* 476 * Check the ethernet for a new packet. The ethernet 477 * receive routine will process it. 478 */ 479 eth_rx(); 480 481 /* 482 * Abort if ctrl-c was pressed. 483 */ 484 if (ctrlc()) { 485 /* cancel any ARP that may not have completed */ 486 NetArpWaitPacketIP = 0; 487 488 net_cleanup_loop(); 489 eth_halt(); 490 /* Invalidate the last protocol */ 491 eth_set_last_protocol(BOOTP); 492 493 puts("\nAbort\n"); 494 /* include a debug print as well incase the debug 495 messages are directed to stderr */ 496 debug_cond(DEBUG_INT_STATE, "--- NetLoop Abort!\n"); 497 goto done; 498 } 499 500 ArpTimeoutCheck(); 501 502 /* 503 * Check for a timeout, and run the timeout handler 504 * if we have one. 505 */ 506 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) { 507 thand_f *x; 508 509 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 510 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ 511 defined(CONFIG_STATUS_LED) && \ 512 defined(STATUS_LED_RED) 513 /* 514 * Echo the inverted link state to the fault LED. 515 */ 516 if (miiphy_link(eth_get_dev()->name, 517 CONFIG_SYS_FAULT_MII_ADDR)) { 518 status_led_set(STATUS_LED_RED, STATUS_LED_OFF); 519 } else { 520 status_led_set(STATUS_LED_RED, STATUS_LED_ON); 521 } 522 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 523 #endif /* CONFIG_MII, ... */ 524 debug_cond(DEBUG_INT_STATE, "--- NetLoop timeout\n"); 525 x = timeHandler; 526 timeHandler = (thand_f *)0; 527 (*x)(); 528 } 529 530 if (net_state == NETLOOP_FAIL) 531 NetStartAgain(); 532 533 switch (net_state) { 534 535 case NETLOOP_RESTART: 536 NetRestarted = 1; 537 goto restart; 538 539 case NETLOOP_SUCCESS: 540 net_cleanup_loop(); 541 if (NetBootFileXferSize > 0) { 542 printf("Bytes transferred = %ld (%lx hex)\n", 543 NetBootFileXferSize, 544 NetBootFileXferSize); 545 setenv_hex("filesize", NetBootFileXferSize); 546 setenv_hex("fileaddr", load_addr); 547 } 548 if (protocol != NETCONS) 549 eth_halt(); 550 else 551 eth_halt_state_only(); 552 553 eth_set_last_protocol(protocol); 554 555 ret = NetBootFileXferSize; 556 debug_cond(DEBUG_INT_STATE, "--- NetLoop Success!\n"); 557 goto done; 558 559 case NETLOOP_FAIL: 560 net_cleanup_loop(); 561 /* Invalidate the last protocol */ 562 eth_set_last_protocol(BOOTP); 563 debug_cond(DEBUG_INT_STATE, "--- NetLoop Fail!\n"); 564 goto done; 565 566 case NETLOOP_CONTINUE: 567 continue; 568 } 569 } 570 571 done: 572 #ifdef CONFIG_USB_KEYBOARD 573 net_busy_flag = 0; 574 #endif 575 #ifdef CONFIG_CMD_TFTPPUT 576 /* Clear out the handlers */ 577 net_set_udp_handler(NULL); 578 net_set_icmp_handler(NULL); 579 #endif 580 return ret; 581 } 582 583 /**********************************************************************/ 584 585 static void 586 startAgainTimeout(void) 587 { 588 net_set_state(NETLOOP_RESTART); 589 } 590 591 void NetStartAgain(void) 592 { 593 char *nretry; 594 int retry_forever = 0; 595 unsigned long retrycnt = 0; 596 597 nretry = getenv("netretry"); 598 if (nretry) { 599 if (!strcmp(nretry, "yes")) 600 retry_forever = 1; 601 else if (!strcmp(nretry, "no")) 602 retrycnt = 0; 603 else if (!strcmp(nretry, "once")) 604 retrycnt = 1; 605 else 606 retrycnt = simple_strtoul(nretry, NULL, 0); 607 } else { 608 retrycnt = 0; 609 retry_forever = 0; 610 } 611 612 if ((!retry_forever) && (NetTryCount >= retrycnt)) { 613 eth_halt(); 614 net_set_state(NETLOOP_FAIL); 615 return; 616 } 617 618 NetTryCount++; 619 620 eth_halt(); 621 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER) 622 eth_try_another(!NetRestarted); 623 #endif 624 eth_init(); 625 if (NetRestartWrap) { 626 NetRestartWrap = 0; 627 if (NetDevExists) { 628 NetSetTimeout(10000UL, startAgainTimeout); 629 net_set_udp_handler(NULL); 630 } else { 631 net_set_state(NETLOOP_FAIL); 632 } 633 } else { 634 net_set_state(NETLOOP_RESTART); 635 } 636 } 637 638 /**********************************************************************/ 639 /* 640 * Miscelaneous bits. 641 */ 642 643 static void dummy_handler(uchar *pkt, unsigned dport, 644 IPaddr_t sip, unsigned sport, 645 unsigned len) 646 { 647 } 648 649 rxhand_f *net_get_udp_handler(void) 650 { 651 return udp_packet_handler; 652 } 653 654 void net_set_udp_handler(rxhand_f *f) 655 { 656 debug_cond(DEBUG_INT_STATE, "--- NetLoop UDP handler set (%p)\n", f); 657 if (f == NULL) 658 udp_packet_handler = dummy_handler; 659 else 660 udp_packet_handler = f; 661 } 662 663 rxhand_f *net_get_arp_handler(void) 664 { 665 return arp_packet_handler; 666 } 667 668 void net_set_arp_handler(rxhand_f *f) 669 { 670 debug_cond(DEBUG_INT_STATE, "--- NetLoop ARP handler set (%p)\n", f); 671 if (f == NULL) 672 arp_packet_handler = dummy_handler; 673 else 674 arp_packet_handler = f; 675 } 676 677 #ifdef CONFIG_CMD_TFTPPUT 678 void net_set_icmp_handler(rxhand_icmp_f *f) 679 { 680 packet_icmp_handler = f; 681 } 682 #endif 683 684 void 685 NetSetTimeout(ulong iv, thand_f *f) 686 { 687 if (iv == 0) { 688 debug_cond(DEBUG_INT_STATE, 689 "--- NetLoop timeout handler cancelled\n"); 690 timeHandler = (thand_f *)0; 691 } else { 692 debug_cond(DEBUG_INT_STATE, 693 "--- NetLoop timeout handler set (%p)\n", f); 694 timeHandler = f; 695 timeStart = get_timer(0); 696 timeDelta = iv * CONFIG_SYS_HZ / 1000; 697 } 698 } 699 700 int NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, 701 int payload_len) 702 { 703 uchar *pkt; 704 int eth_hdr_size; 705 int pkt_hdr_size; 706 707 /* make sure the NetTxPacket is initialized (NetInit() was called) */ 708 assert(NetTxPacket != NULL); 709 if (NetTxPacket == NULL) 710 return -1; 711 712 /* convert to new style broadcast */ 713 if (dest == 0) 714 dest = 0xFFFFFFFF; 715 716 /* if broadcast, make the ether address a broadcast and don't do ARP */ 717 if (dest == 0xFFFFFFFF) 718 ether = NetBcastAddr; 719 720 pkt = (uchar *)NetTxPacket; 721 722 eth_hdr_size = NetSetEther(pkt, ether, PROT_IP); 723 pkt += eth_hdr_size; 724 net_set_udp_header(pkt, dest, dport, sport, payload_len); 725 pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE; 726 727 /* if MAC address was not discovered yet, do an ARP request */ 728 if (memcmp(ether, NetEtherNullAddr, 6) == 0) { 729 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest); 730 731 /* save the ip and eth addr for the packet to send after arp */ 732 NetArpWaitPacketIP = dest; 733 NetArpWaitPacketMAC = ether; 734 735 /* size of the waiting packet */ 736 NetArpWaitTxPacketSize = pkt_hdr_size + payload_len; 737 738 /* and do the ARP request */ 739 NetArpWaitTry = 1; 740 NetArpWaitTimerStart = get_timer(0); 741 ArpRequest(); 742 return 1; /* waiting */ 743 } else { 744 debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n", 745 &dest, ether); 746 NetSendPacket(NetTxPacket, pkt_hdr_size + payload_len); 747 return 0; /* transmitted */ 748 } 749 } 750 751 #ifdef CONFIG_IP_DEFRAG 752 /* 753 * This function collects fragments in a single packet, according 754 * to the algorithm in RFC815. It returns NULL or the pointer to 755 * a complete packet, in static storage 756 */ 757 #ifndef CONFIG_NET_MAXDEFRAG 758 #define CONFIG_NET_MAXDEFRAG 16384 759 #endif 760 /* 761 * MAXDEFRAG, above, is chosen in the config file and is real data 762 * so we need to add the NFS overhead, which is more than TFTP. 763 * To use sizeof in the internal unnamed structures, we need a real 764 * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately). 765 * The compiler doesn't complain nor allocates the actual structure 766 */ 767 static struct rpc_t rpc_specimen; 768 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply)) 769 770 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE) 771 772 /* 773 * this is the packet being assembled, either data or frag control. 774 * Fragments go by 8 bytes, so this union must be 8 bytes long 775 */ 776 struct hole { 777 /* first_byte is address of this structure */ 778 u16 last_byte; /* last byte in this hole + 1 (begin of next hole) */ 779 u16 next_hole; /* index of next (in 8-b blocks), 0 == none */ 780 u16 prev_hole; /* index of prev, 0 == none */ 781 u16 unused; 782 }; 783 784 static struct ip_udp_hdr *__NetDefragment(struct ip_udp_hdr *ip, int *lenp) 785 { 786 static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN); 787 static u16 first_hole, total_len; 788 struct hole *payload, *thisfrag, *h, *newh; 789 struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff; 790 uchar *indata = (uchar *)ip; 791 int offset8, start, len, done = 0; 792 u16 ip_off = ntohs(ip->ip_off); 793 794 /* payload starts after IP header, this fragment is in there */ 795 payload = (struct hole *)(pkt_buff + IP_HDR_SIZE); 796 offset8 = (ip_off & IP_OFFS); 797 thisfrag = payload + offset8; 798 start = offset8 * 8; 799 len = ntohs(ip->ip_len) - IP_HDR_SIZE; 800 801 if (start + len > IP_MAXUDP) /* fragment extends too far */ 802 return NULL; 803 804 if (!total_len || localip->ip_id != ip->ip_id) { 805 /* new (or different) packet, reset structs */ 806 total_len = 0xffff; 807 payload[0].last_byte = ~0; 808 payload[0].next_hole = 0; 809 payload[0].prev_hole = 0; 810 first_hole = 0; 811 /* any IP header will work, copy the first we received */ 812 memcpy(localip, ip, IP_HDR_SIZE); 813 } 814 815 /* 816 * What follows is the reassembly algorithm. We use the payload 817 * array as a linked list of hole descriptors, as each hole starts 818 * at a multiple of 8 bytes. However, last byte can be whatever value, 819 * so it is represented as byte count, not as 8-byte blocks. 820 */ 821 822 h = payload + first_hole; 823 while (h->last_byte < start) { 824 if (!h->next_hole) { 825 /* no hole that far away */ 826 return NULL; 827 } 828 h = payload + h->next_hole; 829 } 830 831 /* last fragment may be 1..7 bytes, the "+7" forces acceptance */ 832 if (offset8 + ((len + 7) / 8) <= h - payload) { 833 /* no overlap with holes (dup fragment?) */ 834 return NULL; 835 } 836 837 if (!(ip_off & IP_FLAGS_MFRAG)) { 838 /* no more fragmentss: truncate this (last) hole */ 839 total_len = start + len; 840 h->last_byte = start + len; 841 } 842 843 /* 844 * There is some overlap: fix the hole list. This code doesn't 845 * deal with a fragment that overlaps with two different holes 846 * (thus being a superset of a previously-received fragment). 847 */ 848 849 if ((h >= thisfrag) && (h->last_byte <= start + len)) { 850 /* complete overlap with hole: remove hole */ 851 if (!h->prev_hole && !h->next_hole) { 852 /* last remaining hole */ 853 done = 1; 854 } else if (!h->prev_hole) { 855 /* first hole */ 856 first_hole = h->next_hole; 857 payload[h->next_hole].prev_hole = 0; 858 } else if (!h->next_hole) { 859 /* last hole */ 860 payload[h->prev_hole].next_hole = 0; 861 } else { 862 /* in the middle of the list */ 863 payload[h->next_hole].prev_hole = h->prev_hole; 864 payload[h->prev_hole].next_hole = h->next_hole; 865 } 866 867 } else if (h->last_byte <= start + len) { 868 /* overlaps with final part of the hole: shorten this hole */ 869 h->last_byte = start; 870 871 } else if (h >= thisfrag) { 872 /* overlaps with initial part of the hole: move this hole */ 873 newh = thisfrag + (len / 8); 874 *newh = *h; 875 h = newh; 876 if (h->next_hole) 877 payload[h->next_hole].prev_hole = (h - payload); 878 if (h->prev_hole) 879 payload[h->prev_hole].next_hole = (h - payload); 880 else 881 first_hole = (h - payload); 882 883 } else { 884 /* fragment sits in the middle: split the hole */ 885 newh = thisfrag + (len / 8); 886 *newh = *h; 887 h->last_byte = start; 888 h->next_hole = (newh - payload); 889 newh->prev_hole = (h - payload); 890 if (newh->next_hole) 891 payload[newh->next_hole].prev_hole = (newh - payload); 892 } 893 894 /* finally copy this fragment and possibly return whole packet */ 895 memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len); 896 if (!done) 897 return NULL; 898 899 localip->ip_len = htons(total_len); 900 *lenp = total_len + IP_HDR_SIZE; 901 return localip; 902 } 903 904 static inline struct ip_udp_hdr *NetDefragment(struct ip_udp_hdr *ip, int *lenp) 905 { 906 u16 ip_off = ntohs(ip->ip_off); 907 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) 908 return ip; /* not a fragment */ 909 return __NetDefragment(ip, lenp); 910 } 911 912 #else /* !CONFIG_IP_DEFRAG */ 913 914 static inline struct ip_udp_hdr *NetDefragment(struct ip_udp_hdr *ip, int *lenp) 915 { 916 u16 ip_off = ntohs(ip->ip_off); 917 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) 918 return ip; /* not a fragment */ 919 return NULL; 920 } 921 #endif 922 923 /** 924 * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently 925 * drop others. 926 * 927 * @parma ip IP packet containing the ICMP 928 */ 929 static void receive_icmp(struct ip_udp_hdr *ip, int len, 930 IPaddr_t src_ip, struct ethernet_hdr *et) 931 { 932 struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src; 933 934 switch (icmph->type) { 935 case ICMP_REDIRECT: 936 if (icmph->code != ICMP_REDIR_HOST) 937 return; 938 printf(" ICMP Host Redirect to %pI4 ", 939 &icmph->un.gateway); 940 break; 941 default: 942 #if defined(CONFIG_CMD_PING) 943 ping_receive(et, ip, len); 944 #endif 945 #ifdef CONFIG_CMD_TFTPPUT 946 if (packet_icmp_handler) 947 packet_icmp_handler(icmph->type, icmph->code, 948 ntohs(ip->udp_dst), src_ip, ntohs(ip->udp_src), 949 icmph->un.data, ntohs(ip->udp_len)); 950 #endif 951 break; 952 } 953 } 954 955 void 956 NetReceive(uchar *inpkt, int len) 957 { 958 struct ethernet_hdr *et; 959 struct ip_udp_hdr *ip; 960 IPaddr_t dst_ip; 961 IPaddr_t src_ip; 962 int eth_proto; 963 #if defined(CONFIG_CMD_CDP) 964 int iscdp; 965 #endif 966 ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid; 967 968 debug_cond(DEBUG_NET_PKT, "packet received\n"); 969 970 NetRxPacket = inpkt; 971 NetRxPacketLen = len; 972 et = (struct ethernet_hdr *)inpkt; 973 974 /* too small packet? */ 975 if (len < ETHER_HDR_SIZE) 976 return; 977 978 #ifdef CONFIG_API 979 if (push_packet) { 980 (*push_packet)(inpkt, len); 981 return; 982 } 983 #endif 984 985 #if defined(CONFIG_CMD_CDP) 986 /* keep track if packet is CDP */ 987 iscdp = is_cdp_packet(et->et_dest); 988 #endif 989 990 myvlanid = ntohs(NetOurVLAN); 991 if (myvlanid == (ushort)-1) 992 myvlanid = VLAN_NONE; 993 mynvlanid = ntohs(NetOurNativeVLAN); 994 if (mynvlanid == (ushort)-1) 995 mynvlanid = VLAN_NONE; 996 997 eth_proto = ntohs(et->et_protlen); 998 999 if (eth_proto < 1514) { 1000 struct e802_hdr *et802 = (struct e802_hdr *)et; 1001 /* 1002 * Got a 802.2 packet. Check the other protocol field. 1003 * XXX VLAN over 802.2+SNAP not implemented! 1004 */ 1005 eth_proto = ntohs(et802->et_prot); 1006 1007 ip = (struct ip_udp_hdr *)(inpkt + E802_HDR_SIZE); 1008 len -= E802_HDR_SIZE; 1009 1010 } else if (eth_proto != PROT_VLAN) { /* normal packet */ 1011 ip = (struct ip_udp_hdr *)(inpkt + ETHER_HDR_SIZE); 1012 len -= ETHER_HDR_SIZE; 1013 1014 } else { /* VLAN packet */ 1015 struct vlan_ethernet_hdr *vet = 1016 (struct vlan_ethernet_hdr *)et; 1017 1018 debug_cond(DEBUG_NET_PKT, "VLAN packet received\n"); 1019 1020 /* too small packet? */ 1021 if (len < VLAN_ETHER_HDR_SIZE) 1022 return; 1023 1024 /* if no VLAN active */ 1025 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE 1026 #if defined(CONFIG_CMD_CDP) 1027 && iscdp == 0 1028 #endif 1029 ) 1030 return; 1031 1032 cti = ntohs(vet->vet_tag); 1033 vlanid = cti & VLAN_IDMASK; 1034 eth_proto = ntohs(vet->vet_type); 1035 1036 ip = (struct ip_udp_hdr *)(inpkt + VLAN_ETHER_HDR_SIZE); 1037 len -= VLAN_ETHER_HDR_SIZE; 1038 } 1039 1040 debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto); 1041 1042 #if defined(CONFIG_CMD_CDP) 1043 if (iscdp) { 1044 cdp_receive((uchar *)ip, len); 1045 return; 1046 } 1047 #endif 1048 1049 if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) { 1050 if (vlanid == VLAN_NONE) 1051 vlanid = (mynvlanid & VLAN_IDMASK); 1052 /* not matched? */ 1053 if (vlanid != (myvlanid & VLAN_IDMASK)) 1054 return; 1055 } 1056 1057 switch (eth_proto) { 1058 1059 case PROT_ARP: 1060 ArpReceive(et, ip, len); 1061 break; 1062 1063 #ifdef CONFIG_CMD_RARP 1064 case PROT_RARP: 1065 rarp_receive(ip, len); 1066 break; 1067 #endif 1068 case PROT_IP: 1069 debug_cond(DEBUG_NET_PKT, "Got IP\n"); 1070 /* Before we start poking the header, make sure it is there */ 1071 if (len < IP_UDP_HDR_SIZE) { 1072 debug("len bad %d < %lu\n", len, 1073 (ulong)IP_UDP_HDR_SIZE); 1074 return; 1075 } 1076 /* Check the packet length */ 1077 if (len < ntohs(ip->ip_len)) { 1078 debug("len bad %d < %d\n", len, ntohs(ip->ip_len)); 1079 return; 1080 } 1081 len = ntohs(ip->ip_len); 1082 debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n", 1083 len, ip->ip_hl_v & 0xff); 1084 1085 /* Can't deal with anything except IPv4 */ 1086 if ((ip->ip_hl_v & 0xf0) != 0x40) 1087 return; 1088 /* Can't deal with IP options (headers != 20 bytes) */ 1089 if ((ip->ip_hl_v & 0x0f) > 0x05) 1090 return; 1091 /* Check the Checksum of the header */ 1092 if (!ip_checksum_ok((uchar *)ip, IP_HDR_SIZE)) { 1093 debug("checksum bad\n"); 1094 return; 1095 } 1096 /* If it is not for us, ignore it */ 1097 dst_ip = NetReadIP(&ip->ip_dst); 1098 if (NetOurIP && dst_ip != NetOurIP && dst_ip != 0xFFFFFFFF) { 1099 #ifdef CONFIG_MCAST_TFTP 1100 if (Mcast_addr != dst_ip) 1101 #endif 1102 return; 1103 } 1104 /* Read source IP address for later use */ 1105 src_ip = NetReadIP(&ip->ip_src); 1106 /* 1107 * The function returns the unchanged packet if it's not 1108 * a fragment, and either the complete packet or NULL if 1109 * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL) 1110 */ 1111 ip = NetDefragment(ip, &len); 1112 if (!ip) 1113 return; 1114 /* 1115 * watch for ICMP host redirects 1116 * 1117 * There is no real handler code (yet). We just watch 1118 * for ICMP host redirect messages. In case anybody 1119 * sees these messages: please contact me 1120 * (wd@denx.de), or - even better - send me the 1121 * necessary fixes :-) 1122 * 1123 * Note: in all cases where I have seen this so far 1124 * it was a problem with the router configuration, 1125 * for instance when a router was configured in the 1126 * BOOTP reply, but the TFTP server was on the same 1127 * subnet. So this is probably a warning that your 1128 * configuration might be wrong. But I'm not really 1129 * sure if there aren't any other situations. 1130 * 1131 * Simon Glass <sjg@chromium.org>: We get an ICMP when 1132 * we send a tftp packet to a dead connection, or when 1133 * there is no server at the other end. 1134 */ 1135 if (ip->ip_p == IPPROTO_ICMP) { 1136 receive_icmp(ip, len, src_ip, et); 1137 return; 1138 } else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */ 1139 return; 1140 } 1141 1142 debug_cond(DEBUG_DEV_PKT, 1143 "received UDP (to=%pI4, from=%pI4, len=%d)\n", 1144 &dst_ip, &src_ip, len); 1145 1146 #ifdef CONFIG_UDP_CHECKSUM 1147 if (ip->udp_xsum != 0) { 1148 ulong xsum; 1149 ushort *sumptr; 1150 ushort sumlen; 1151 1152 xsum = ip->ip_p; 1153 xsum += (ntohs(ip->udp_len)); 1154 xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff; 1155 xsum += (ntohl(ip->ip_src) >> 0) & 0x0000ffff; 1156 xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff; 1157 xsum += (ntohl(ip->ip_dst) >> 0) & 0x0000ffff; 1158 1159 sumlen = ntohs(ip->udp_len); 1160 sumptr = (ushort *) &(ip->udp_src); 1161 1162 while (sumlen > 1) { 1163 ushort sumdata; 1164 1165 sumdata = *sumptr++; 1166 xsum += ntohs(sumdata); 1167 sumlen -= 2; 1168 } 1169 if (sumlen > 0) { 1170 ushort sumdata; 1171 1172 sumdata = *(unsigned char *) sumptr; 1173 sumdata = (sumdata << 8) & 0xff00; 1174 xsum += sumdata; 1175 } 1176 while ((xsum >> 16) != 0) { 1177 xsum = (xsum & 0x0000ffff) + 1178 ((xsum >> 16) & 0x0000ffff); 1179 } 1180 if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) { 1181 printf(" UDP wrong checksum %08lx %08x\n", 1182 xsum, ntohs(ip->udp_xsum)); 1183 return; 1184 } 1185 } 1186 #endif 1187 1188 1189 #if defined (CONFIG_NETCONSOLE) && !(CONFIG_SPL_BUILD) 1190 nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE, 1191 src_ip, 1192 ntohs(ip->udp_dst), 1193 ntohs(ip->udp_src), 1194 ntohs(ip->udp_len) - UDP_HDR_SIZE); 1195 #endif 1196 /* 1197 * IP header OK. Pass the packet to the current handler. 1198 */ 1199 (*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE, 1200 ntohs(ip->udp_dst), 1201 src_ip, 1202 ntohs(ip->udp_src), 1203 ntohs(ip->udp_len) - UDP_HDR_SIZE); 1204 break; 1205 } 1206 } 1207 1208 1209 /**********************************************************************/ 1210 1211 static int net_check_prereq(enum proto_t protocol) 1212 { 1213 switch (protocol) { 1214 /* Fall through */ 1215 #if defined(CONFIG_CMD_PING) 1216 case PING: 1217 if (NetPingIP == 0) { 1218 puts("*** ERROR: ping address not given\n"); 1219 return 1; 1220 } 1221 goto common; 1222 #endif 1223 #if defined(CONFIG_CMD_SNTP) 1224 case SNTP: 1225 if (NetNtpServerIP == 0) { 1226 puts("*** ERROR: NTP server address not given\n"); 1227 return 1; 1228 } 1229 goto common; 1230 #endif 1231 #if defined(CONFIG_CMD_DNS) 1232 case DNS: 1233 if (NetOurDNSIP == 0) { 1234 puts("*** ERROR: DNS server address not given\n"); 1235 return 1; 1236 } 1237 goto common; 1238 #endif 1239 #if defined(CONFIG_CMD_NFS) 1240 case NFS: 1241 #endif 1242 case TFTPGET: 1243 case TFTPPUT: 1244 if (NetServerIP == 0) { 1245 puts("*** ERROR: `serverip' not set\n"); 1246 return 1; 1247 } 1248 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \ 1249 defined(CONFIG_CMD_DNS) 1250 common: 1251 #endif 1252 /* Fall through */ 1253 1254 case NETCONS: 1255 case TFTPSRV: 1256 if (NetOurIP == 0) { 1257 puts("*** ERROR: `ipaddr' not set\n"); 1258 return 1; 1259 } 1260 /* Fall through */ 1261 1262 #ifdef CONFIG_CMD_RARP 1263 case RARP: 1264 #endif 1265 case BOOTP: 1266 case CDP: 1267 case DHCP: 1268 case LINKLOCAL: 1269 if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) { 1270 int num = eth_get_dev_index(); 1271 1272 switch (num) { 1273 case -1: 1274 puts("*** ERROR: No ethernet found.\n"); 1275 return 1; 1276 case 0: 1277 puts("*** ERROR: `ethaddr' not set\n"); 1278 break; 1279 default: 1280 printf("*** ERROR: `eth%daddr' not set\n", 1281 num); 1282 break; 1283 } 1284 1285 NetStartAgain(); 1286 return 2; 1287 } 1288 /* Fall through */ 1289 default: 1290 return 0; 1291 } 1292 return 0; /* OK */ 1293 } 1294 /**********************************************************************/ 1295 1296 int 1297 NetEthHdrSize(void) 1298 { 1299 ushort myvlanid; 1300 1301 myvlanid = ntohs(NetOurVLAN); 1302 if (myvlanid == (ushort)-1) 1303 myvlanid = VLAN_NONE; 1304 1305 return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : 1306 VLAN_ETHER_HDR_SIZE; 1307 } 1308 1309 int 1310 NetSetEther(uchar *xet, uchar * addr, uint prot) 1311 { 1312 struct ethernet_hdr *et = (struct ethernet_hdr *)xet; 1313 ushort myvlanid; 1314 1315 myvlanid = ntohs(NetOurVLAN); 1316 if (myvlanid == (ushort)-1) 1317 myvlanid = VLAN_NONE; 1318 1319 memcpy(et->et_dest, addr, 6); 1320 memcpy(et->et_src, NetOurEther, 6); 1321 if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) { 1322 et->et_protlen = htons(prot); 1323 return ETHER_HDR_SIZE; 1324 } else { 1325 struct vlan_ethernet_hdr *vet = 1326 (struct vlan_ethernet_hdr *)xet; 1327 1328 vet->vet_vlan_type = htons(PROT_VLAN); 1329 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK)); 1330 vet->vet_type = htons(prot); 1331 return VLAN_ETHER_HDR_SIZE; 1332 } 1333 } 1334 1335 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot) 1336 { 1337 ushort protlen; 1338 1339 memcpy(et->et_dest, addr, 6); 1340 memcpy(et->et_src, NetOurEther, 6); 1341 protlen = ntohs(et->et_protlen); 1342 if (protlen == PROT_VLAN) { 1343 struct vlan_ethernet_hdr *vet = 1344 (struct vlan_ethernet_hdr *)et; 1345 vet->vet_type = htons(prot); 1346 return VLAN_ETHER_HDR_SIZE; 1347 } else if (protlen > 1514) { 1348 et->et_protlen = htons(prot); 1349 return ETHER_HDR_SIZE; 1350 } else { 1351 /* 802.2 + SNAP */ 1352 struct e802_hdr *et802 = (struct e802_hdr *)et; 1353 et802->et_prot = htons(prot); 1354 return E802_HDR_SIZE; 1355 } 1356 } 1357 1358 void net_set_ip_header(uchar *pkt, IPaddr_t dest, IPaddr_t source) 1359 { 1360 struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt; 1361 1362 /* 1363 * Construct an IP header. 1364 */ 1365 /* IP_HDR_SIZE / 4 (not including UDP) */ 1366 ip->ip_hl_v = 0x45; 1367 ip->ip_tos = 0; 1368 ip->ip_len = htons(IP_HDR_SIZE); 1369 ip->ip_id = htons(NetIPID++); 1370 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ 1371 ip->ip_ttl = 255; 1372 ip->ip_sum = 0; 1373 /* already in network byte order */ 1374 NetCopyIP((void *)&ip->ip_src, &source); 1375 /* already in network byte order */ 1376 NetCopyIP((void *)&ip->ip_dst, &dest); 1377 } 1378 1379 void net_set_udp_header(uchar *pkt, IPaddr_t dest, int dport, int sport, 1380 int len) 1381 { 1382 struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt; 1383 1384 /* 1385 * If the data is an odd number of bytes, zero the 1386 * byte after the last byte so that the checksum 1387 * will work. 1388 */ 1389 if (len & 1) 1390 pkt[IP_UDP_HDR_SIZE + len] = 0; 1391 1392 net_set_ip_header(pkt, dest, NetOurIP); 1393 ip->ip_len = htons(IP_UDP_HDR_SIZE + len); 1394 ip->ip_p = IPPROTO_UDP; 1395 ip->ip_sum = compute_ip_checksum(ip, IP_HDR_SIZE); 1396 1397 ip->udp_src = htons(sport); 1398 ip->udp_dst = htons(dport); 1399 ip->udp_len = htons(UDP_HDR_SIZE + len); 1400 ip->udp_xsum = 0; 1401 } 1402 1403 void copy_filename(char *dst, const char *src, int size) 1404 { 1405 if (*src && (*src == '"')) { 1406 ++src; 1407 --size; 1408 } 1409 1410 while ((--size > 0) && *src && (*src != '"')) 1411 *dst++ = *src++; 1412 *dst = '\0'; 1413 } 1414 1415 #if defined(CONFIG_CMD_NFS) || \ 1416 defined(CONFIG_CMD_SNTP) || \ 1417 defined(CONFIG_CMD_DNS) 1418 /* 1419 * make port a little random (1024-17407) 1420 * This keeps the math somewhat trivial to compute, and seems to work with 1421 * all supported protocols/clients/servers 1422 */ 1423 unsigned int random_port(void) 1424 { 1425 return 1024 + (get_timer(0) % 0x4000); 1426 } 1427 #endif 1428 1429 void ip_to_string(IPaddr_t x, char *s) 1430 { 1431 x = ntohl(x); 1432 sprintf(s, "%d.%d.%d.%d", 1433 (int) ((x >> 24) & 0xff), 1434 (int) ((x >> 16) & 0xff), 1435 (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff) 1436 ); 1437 } 1438 1439 void VLAN_to_string(ushort x, char *s) 1440 { 1441 x = ntohs(x); 1442 1443 if (x == (ushort)-1) 1444 x = VLAN_NONE; 1445 1446 if (x == VLAN_NONE) 1447 strcpy(s, "none"); 1448 else 1449 sprintf(s, "%d", x & VLAN_IDMASK); 1450 } 1451 1452 ushort string_to_VLAN(const char *s) 1453 { 1454 ushort id; 1455 1456 if (s == NULL) 1457 return htons(VLAN_NONE); 1458 1459 if (*s < '0' || *s > '9') 1460 id = VLAN_NONE; 1461 else 1462 id = (ushort)simple_strtoul(s, NULL, 10); 1463 1464 return htons(id); 1465 } 1466 1467 ushort getenv_VLAN(char *var) 1468 { 1469 return string_to_VLAN(getenv(var)); 1470 } 1471