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 */ 10 11 /* 12 * General Desription: 13 * 14 * The user interface supports commands for BOOTP, RARP, and TFTP. 15 * Also, we support ARP internally. Depending on available data, 16 * these interact as follows: 17 * 18 * BOOTP: 19 * 20 * Prerequisites: - own ethernet address 21 * We want: - own IP address 22 * - TFTP server IP address 23 * - name of bootfile 24 * Next step: ARP 25 * 26 * LINK_LOCAL: 27 * 28 * Prerequisites: - own ethernet address 29 * We want: - own IP address 30 * Next step: ARP 31 * 32 * RARP: 33 * 34 * Prerequisites: - own ethernet address 35 * We want: - own IP address 36 * - TFTP server IP address 37 * Next step: ARP 38 * 39 * ARP: 40 * 41 * Prerequisites: - own ethernet address 42 * - own IP address 43 * - TFTP server IP address 44 * We want: - TFTP server ethernet address 45 * Next step: TFTP 46 * 47 * DHCP: 48 * 49 * Prerequisites: - own ethernet address 50 * We want: - IP, Netmask, ServerIP, Gateway IP 51 * - bootfilename, lease time 52 * Next step: - TFTP 53 * 54 * TFTP: 55 * 56 * Prerequisites: - own ethernet address 57 * - own IP address 58 * - TFTP server IP address 59 * - TFTP server ethernet address 60 * - name of bootfile (if unknown, we use a default name 61 * derived from our own IP address) 62 * We want: - load the boot file 63 * Next step: none 64 * 65 * NFS: 66 * 67 * Prerequisites: - own ethernet address 68 * - own IP address 69 * - name of bootfile (if unknown, we use a default name 70 * derived from our own IP address) 71 * We want: - load the boot file 72 * Next step: none 73 * 74 * SNTP: 75 * 76 * Prerequisites: - own ethernet address 77 * - own IP address 78 * We want: - network time 79 * Next step: none 80 */ 81 82 83 #include <common.h> 84 #include <command.h> 85 #include <environment.h> 86 #include <net.h> 87 #if defined(CONFIG_STATUS_LED) 88 #include <miiphy.h> 89 #include <status_led.h> 90 #endif 91 #include <watchdog.h> 92 #include <linux/compiler.h> 93 #include "arp.h" 94 #include "bootp.h" 95 #include "cdp.h" 96 #if defined(CONFIG_CMD_DNS) 97 #include "dns.h" 98 #endif 99 #include "link_local.h" 100 #include "nfs.h" 101 #include "ping.h" 102 #include "rarp.h" 103 #if defined(CONFIG_CMD_SNTP) 104 #include "sntp.h" 105 #endif 106 #include "tftp.h" 107 108 DECLARE_GLOBAL_DATA_PTR; 109 110 /** BOOTP EXTENTIONS **/ 111 112 /* Our subnet mask (0=unknown) */ 113 IPaddr_t NetOurSubnetMask; 114 /* Our gateways IP address */ 115 IPaddr_t NetOurGatewayIP; 116 /* Our DNS IP address */ 117 IPaddr_t NetOurDNSIP; 118 #if defined(CONFIG_BOOTP_DNS2) 119 /* Our 2nd DNS IP address */ 120 IPaddr_t NetOurDNS2IP; 121 #endif 122 /* Our NIS domain */ 123 char NetOurNISDomain[32] = {0,}; 124 /* Our hostname */ 125 char NetOurHostName[32] = {0,}; 126 /* Our bootpath */ 127 char NetOurRootPath[64] = {0,}; 128 /* Our bootfile size in blocks */ 129 ushort NetBootFileSize; 130 131 #ifdef CONFIG_MCAST_TFTP /* Multicast TFTP */ 132 IPaddr_t Mcast_addr; 133 #endif 134 135 /** END OF BOOTP EXTENTIONS **/ 136 137 /* The actual transferred size of the bootfile (in bytes) */ 138 ulong NetBootFileXferSize; 139 /* Our ethernet address */ 140 uchar NetOurEther[6]; 141 /* Boot server enet address */ 142 uchar NetServerEther[6]; 143 /* Our IP addr (0 = unknown) */ 144 IPaddr_t NetOurIP; 145 /* Server IP addr (0 = unknown) */ 146 IPaddr_t NetServerIP; 147 /* Current receive packet */ 148 uchar *NetRxPacket; 149 /* Current rx packet length */ 150 int NetRxPacketLen; 151 /* IP packet ID */ 152 unsigned NetIPID; 153 /* Ethernet bcast address */ 154 uchar NetBcastAddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 155 uchar NetEtherNullAddr[6]; 156 #ifdef CONFIG_API 157 void (*push_packet)(void *, int len) = 0; 158 #endif 159 /* Network loop state */ 160 enum net_loop_state net_state; 161 /* Tried all network devices */ 162 int NetRestartWrap; 163 /* Network loop restarted */ 164 static int NetRestarted; 165 /* At least one device configured */ 166 static int NetDevExists; 167 168 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */ 169 /* default is without VLAN */ 170 ushort NetOurVLAN = 0xFFFF; 171 /* ditto */ 172 ushort NetOurNativeVLAN = 0xFFFF; 173 174 /* Boot File name */ 175 char BootFile[128]; 176 177 #if defined(CONFIG_CMD_SNTP) 178 /* NTP server IP address */ 179 IPaddr_t NetNtpServerIP; 180 /* offset time from UTC */ 181 int NetTimeOffset; 182 #endif 183 184 static uchar PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN]; 185 186 /* Receive packet */ 187 uchar *NetRxPackets[PKTBUFSRX]; 188 189 /* Current UDP RX packet handler */ 190 static rxhand_f *udp_packet_handler; 191 /* Current ARP RX packet handler */ 192 static rxhand_f *arp_packet_handler; 193 #ifdef CONFIG_CMD_TFTPPUT 194 /* Current ICMP rx handler */ 195 static rxhand_icmp_f *packet_icmp_handler; 196 #endif 197 /* Current timeout handler */ 198 static thand_f *timeHandler; 199 /* Time base value */ 200 static ulong timeStart; 201 /* Current timeout value */ 202 static ulong timeDelta; 203 /* THE transmit packet */ 204 uchar *NetTxPacket; 205 206 static int net_check_prereq(enum proto_t protocol); 207 208 static int NetTryCount; 209 210 /**********************************************************************/ 211 212 static int on_bootfile(const char *name, const char *value, enum env_op op, 213 int flags) 214 { 215 switch (op) { 216 case env_op_create: 217 case env_op_overwrite: 218 copy_filename(BootFile, value, sizeof(BootFile)); 219 break; 220 default: 221 break; 222 } 223 224 return 0; 225 } 226 U_BOOT_ENV_CALLBACK(bootfile, on_bootfile); 227 228 /* 229 * Check if autoload is enabled. If so, use either NFS or TFTP to download 230 * the boot file. 231 */ 232 void net_auto_load(void) 233 { 234 #if defined(CONFIG_CMD_NFS) 235 const char *s = getenv("autoload"); 236 237 if (s != NULL && strcmp(s, "NFS") == 0) { 238 /* 239 * Use NFS to load the bootfile. 240 */ 241 NfsStart(); 242 return; 243 } 244 #endif 245 if (getenv_yesno("autoload") == 0) { 246 /* 247 * Just use BOOTP/RARP to configure system; 248 * Do not use TFTP to load the bootfile. 249 */ 250 net_set_state(NETLOOP_SUCCESS); 251 return; 252 } 253 TftpStart(TFTPGET); 254 } 255 256 static void NetInitLoop(void) 257 { 258 static int env_changed_id; 259 int env_id = get_env_id(); 260 261 /* update only when the environment has changed */ 262 if (env_changed_id != env_id) { 263 NetOurIP = getenv_IPaddr("ipaddr"); 264 NetOurGatewayIP = getenv_IPaddr("gatewayip"); 265 NetOurSubnetMask = getenv_IPaddr("netmask"); 266 NetServerIP = getenv_IPaddr("serverip"); 267 NetOurNativeVLAN = getenv_VLAN("nvlan"); 268 NetOurVLAN = getenv_VLAN("vlan"); 269 #if defined(CONFIG_CMD_DNS) 270 NetOurDNSIP = getenv_IPaddr("dnsip"); 271 #endif 272 env_changed_id = env_id; 273 } 274 if (eth_get_dev()) 275 memcpy(NetOurEther, eth_get_dev()->enetaddr, 6); 276 277 return; 278 } 279 280 static void net_clear_handlers(void) 281 { 282 net_set_udp_handler(NULL); 283 net_set_arp_handler(NULL); 284 NetSetTimeout(0, NULL); 285 } 286 287 static void net_cleanup_loop(void) 288 { 289 net_clear_handlers(); 290 } 291 292 void net_init(void) 293 { 294 static int first_call = 1; 295 296 if (first_call) { 297 /* 298 * Setup packet buffers, aligned correctly. 299 */ 300 int i; 301 302 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1); 303 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN; 304 for (i = 0; i < PKTBUFSRX; i++) 305 NetRxPackets[i] = NetTxPacket + (i + 1) * PKTSIZE_ALIGN; 306 307 ArpInit(); 308 net_clear_handlers(); 309 310 /* Only need to setup buffer pointers once. */ 311 first_call = 0; 312 } 313 314 NetInitLoop(); 315 } 316 317 /**********************************************************************/ 318 /* 319 * Main network processing loop. 320 */ 321 322 int NetLoop(enum proto_t protocol) 323 { 324 bd_t *bd = gd->bd; 325 int ret = -1; 326 327 NetRestarted = 0; 328 NetDevExists = 0; 329 NetTryCount = 1; 330 debug_cond(DEBUG_INT_STATE, "--- NetLoop Entry\n"); 331 332 bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start"); 333 net_init(); 334 if (eth_is_on_demand_init() || protocol != NETCONS) { 335 eth_halt(); 336 eth_set_current(); 337 if (eth_init(bd) < 0) { 338 eth_halt(); 339 return -1; 340 } 341 } else 342 eth_init_state_only(bd); 343 344 restart: 345 net_set_state(NETLOOP_CONTINUE); 346 347 /* 348 * Start the ball rolling with the given start function. From 349 * here on, this code is a state machine driven by received 350 * packets and timer events. 351 */ 352 debug_cond(DEBUG_INT_STATE, "--- NetLoop Init\n"); 353 NetInitLoop(); 354 355 switch (net_check_prereq(protocol)) { 356 case 1: 357 /* network not configured */ 358 eth_halt(); 359 return -1; 360 361 case 2: 362 /* network device not configured */ 363 break; 364 365 case 0: 366 NetDevExists = 1; 367 NetBootFileXferSize = 0; 368 switch (protocol) { 369 case TFTPGET: 370 #ifdef CONFIG_CMD_TFTPPUT 371 case TFTPPUT: 372 #endif 373 /* always use ARP to get server ethernet address */ 374 TftpStart(protocol); 375 break; 376 #ifdef CONFIG_CMD_TFTPSRV 377 case TFTPSRV: 378 TftpStartServer(); 379 break; 380 #endif 381 #if defined(CONFIG_CMD_DHCP) 382 case DHCP: 383 BootpTry = 0; 384 NetOurIP = 0; 385 DhcpRequest(); /* Basically same as BOOTP */ 386 break; 387 #endif 388 389 case BOOTP: 390 BootpTry = 0; 391 NetOurIP = 0; 392 BootpRequest(); 393 break; 394 395 #if defined(CONFIG_CMD_RARP) 396 case RARP: 397 RarpTry = 0; 398 NetOurIP = 0; 399 RarpRequest(); 400 break; 401 #endif 402 #if defined(CONFIG_CMD_PING) 403 case PING: 404 ping_start(); 405 break; 406 #endif 407 #if defined(CONFIG_CMD_NFS) 408 case NFS: 409 NfsStart(); 410 break; 411 #endif 412 #if defined(CONFIG_CMD_CDP) 413 case CDP: 414 CDPStart(); 415 break; 416 #endif 417 #ifdef CONFIG_NETCONSOLE 418 case NETCONS: 419 NcStart(); 420 break; 421 #endif 422 #if defined(CONFIG_CMD_SNTP) 423 case SNTP: 424 SntpStart(); 425 break; 426 #endif 427 #if defined(CONFIG_CMD_DNS) 428 case DNS: 429 DnsStart(); 430 break; 431 #endif 432 #if defined(CONFIG_CMD_LINK_LOCAL) 433 case LINKLOCAL: 434 link_local_start(); 435 break; 436 #endif 437 default: 438 break; 439 } 440 441 break; 442 } 443 444 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 445 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ 446 defined(CONFIG_STATUS_LED) && \ 447 defined(STATUS_LED_RED) 448 /* 449 * Echo the inverted link state to the fault LED. 450 */ 451 if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) 452 status_led_set(STATUS_LED_RED, STATUS_LED_OFF); 453 else 454 status_led_set(STATUS_LED_RED, STATUS_LED_ON); 455 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 456 #endif /* CONFIG_MII, ... */ 457 458 /* 459 * Main packet reception loop. Loop receiving packets until 460 * someone sets `net_state' to a state that terminates. 461 */ 462 for (;;) { 463 WATCHDOG_RESET(); 464 #ifdef CONFIG_SHOW_ACTIVITY 465 show_activity(1); 466 #endif 467 /* 468 * Check the ethernet for a new packet. The ethernet 469 * receive routine will process it. 470 */ 471 eth_rx(); 472 473 /* 474 * Abort if ctrl-c was pressed. 475 */ 476 if (ctrlc()) { 477 /* cancel any ARP that may not have completed */ 478 NetArpWaitPacketIP = 0; 479 480 net_cleanup_loop(); 481 eth_halt(); 482 /* Invalidate the last protocol */ 483 eth_set_last_protocol(BOOTP); 484 485 puts("\nAbort\n"); 486 /* include a debug print as well incase the debug 487 messages are directed to stderr */ 488 debug_cond(DEBUG_INT_STATE, "--- NetLoop Abort!\n"); 489 goto done; 490 } 491 492 ArpTimeoutCheck(); 493 494 /* 495 * Check for a timeout, and run the timeout handler 496 * if we have one. 497 */ 498 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) { 499 thand_f *x; 500 501 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 502 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ 503 defined(CONFIG_STATUS_LED) && \ 504 defined(STATUS_LED_RED) 505 /* 506 * Echo the inverted link state to the fault LED. 507 */ 508 if (miiphy_link(eth_get_dev()->name, 509 CONFIG_SYS_FAULT_MII_ADDR)) { 510 status_led_set(STATUS_LED_RED, STATUS_LED_OFF); 511 } else { 512 status_led_set(STATUS_LED_RED, STATUS_LED_ON); 513 } 514 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 515 #endif /* CONFIG_MII, ... */ 516 debug_cond(DEBUG_INT_STATE, "--- NetLoop timeout\n"); 517 x = timeHandler; 518 timeHandler = (thand_f *)0; 519 (*x)(); 520 } 521 522 523 switch (net_state) { 524 525 case NETLOOP_RESTART: 526 NetRestarted = 1; 527 goto restart; 528 529 case NETLOOP_SUCCESS: 530 net_cleanup_loop(); 531 if (NetBootFileXferSize > 0) { 532 printf("Bytes transferred = %ld (%lx hex)\n", 533 NetBootFileXferSize, 534 NetBootFileXferSize); 535 setenv_hex("filesize", NetBootFileXferSize); 536 setenv_hex("fileaddr", load_addr); 537 } 538 if (protocol != NETCONS) 539 eth_halt(); 540 else 541 eth_halt_state_only(); 542 543 eth_set_last_protocol(protocol); 544 545 ret = NetBootFileXferSize; 546 debug_cond(DEBUG_INT_STATE, "--- NetLoop Success!\n"); 547 goto done; 548 549 case NETLOOP_FAIL: 550 net_cleanup_loop(); 551 /* Invalidate the last protocol */ 552 eth_set_last_protocol(BOOTP); 553 debug_cond(DEBUG_INT_STATE, "--- NetLoop Fail!\n"); 554 goto done; 555 556 case NETLOOP_CONTINUE: 557 continue; 558 } 559 } 560 561 done: 562 #ifdef CONFIG_CMD_TFTPPUT 563 /* Clear out the handlers */ 564 net_set_udp_handler(NULL); 565 net_set_icmp_handler(NULL); 566 #endif 567 return ret; 568 } 569 570 /**********************************************************************/ 571 572 static void 573 startAgainTimeout(void) 574 { 575 net_set_state(NETLOOP_RESTART); 576 } 577 578 void NetStartAgain(void) 579 { 580 char *nretry; 581 int retry_forever = 0; 582 unsigned long retrycnt = 0; 583 584 nretry = getenv("netretry"); 585 if (nretry) { 586 if (!strcmp(nretry, "yes")) 587 retry_forever = 1; 588 else if (!strcmp(nretry, "no")) 589 retrycnt = 0; 590 else if (!strcmp(nretry, "once")) 591 retrycnt = 1; 592 else 593 retrycnt = simple_strtoul(nretry, NULL, 0); 594 } else 595 retry_forever = 1; 596 597 if ((!retry_forever) && (NetTryCount >= retrycnt)) { 598 eth_halt(); 599 net_set_state(NETLOOP_FAIL); 600 return; 601 } 602 603 NetTryCount++; 604 605 eth_halt(); 606 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER) 607 eth_try_another(!NetRestarted); 608 #endif 609 eth_init(gd->bd); 610 if (NetRestartWrap) { 611 NetRestartWrap = 0; 612 if (NetDevExists) { 613 NetSetTimeout(10000UL, startAgainTimeout); 614 net_set_udp_handler(NULL); 615 } else { 616 net_set_state(NETLOOP_FAIL); 617 } 618 } else { 619 net_set_state(NETLOOP_RESTART); 620 } 621 } 622 623 /**********************************************************************/ 624 /* 625 * Miscelaneous bits. 626 */ 627 628 static void dummy_handler(uchar *pkt, unsigned dport, 629 IPaddr_t sip, unsigned sport, 630 unsigned len) 631 { 632 } 633 634 rxhand_f *net_get_udp_handler(void) 635 { 636 return udp_packet_handler; 637 } 638 639 void net_set_udp_handler(rxhand_f *f) 640 { 641 debug_cond(DEBUG_INT_STATE, "--- NetLoop UDP handler set (%p)\n", f); 642 if (f == NULL) 643 udp_packet_handler = dummy_handler; 644 else 645 udp_packet_handler = f; 646 } 647 648 rxhand_f *net_get_arp_handler(void) 649 { 650 return arp_packet_handler; 651 } 652 653 void net_set_arp_handler(rxhand_f *f) 654 { 655 debug_cond(DEBUG_INT_STATE, "--- NetLoop ARP handler set (%p)\n", f); 656 if (f == NULL) 657 arp_packet_handler = dummy_handler; 658 else 659 arp_packet_handler = f; 660 } 661 662 #ifdef CONFIG_CMD_TFTPPUT 663 void net_set_icmp_handler(rxhand_icmp_f *f) 664 { 665 packet_icmp_handler = f; 666 } 667 #endif 668 669 void 670 NetSetTimeout(ulong iv, thand_f *f) 671 { 672 if (iv == 0) { 673 debug_cond(DEBUG_INT_STATE, 674 "--- NetLoop timeout handler cancelled\n"); 675 timeHandler = (thand_f *)0; 676 } else { 677 debug_cond(DEBUG_INT_STATE, 678 "--- NetLoop timeout handler set (%p)\n", f); 679 timeHandler = f; 680 timeStart = get_timer(0); 681 timeDelta = iv * CONFIG_SYS_HZ / 1000; 682 } 683 } 684 685 int NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, 686 int payload_len) 687 { 688 uchar *pkt; 689 int eth_hdr_size; 690 int pkt_hdr_size; 691 692 /* make sure the NetTxPacket is initialized (NetInit() was called) */ 693 assert(NetTxPacket != NULL); 694 if (NetTxPacket == NULL) 695 return -1; 696 697 /* convert to new style broadcast */ 698 if (dest == 0) 699 dest = 0xFFFFFFFF; 700 701 /* if broadcast, make the ether address a broadcast and don't do ARP */ 702 if (dest == 0xFFFFFFFF) 703 ether = NetBcastAddr; 704 705 pkt = (uchar *)NetTxPacket; 706 707 eth_hdr_size = NetSetEther(pkt, ether, PROT_IP); 708 pkt += eth_hdr_size; 709 net_set_udp_header(pkt, dest, dport, sport, payload_len); 710 pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE; 711 712 /* if MAC address was not discovered yet, do an ARP request */ 713 if (memcmp(ether, NetEtherNullAddr, 6) == 0) { 714 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest); 715 716 /* save the ip and eth addr for the packet to send after arp */ 717 NetArpWaitPacketIP = dest; 718 NetArpWaitPacketMAC = ether; 719 720 /* size of the waiting packet */ 721 NetArpWaitTxPacketSize = pkt_hdr_size + payload_len; 722 723 /* and do the ARP request */ 724 NetArpWaitTry = 1; 725 NetArpWaitTimerStart = get_timer(0); 726 ArpRequest(); 727 return 1; /* waiting */ 728 } else { 729 debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n", 730 &dest, ether); 731 NetSendPacket(NetTxPacket, pkt_hdr_size + payload_len); 732 return 0; /* transmitted */ 733 } 734 } 735 736 #ifdef CONFIG_IP_DEFRAG 737 /* 738 * This function collects fragments in a single packet, according 739 * to the algorithm in RFC815. It returns NULL or the pointer to 740 * a complete packet, in static storage 741 */ 742 #ifndef CONFIG_NET_MAXDEFRAG 743 #define CONFIG_NET_MAXDEFRAG 16384 744 #endif 745 /* 746 * MAXDEFRAG, above, is chosen in the config file and is real data 747 * so we need to add the NFS overhead, which is more than TFTP. 748 * To use sizeof in the internal unnamed structures, we need a real 749 * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately). 750 * The compiler doesn't complain nor allocates the actual structure 751 */ 752 static struct rpc_t rpc_specimen; 753 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply)) 754 755 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE) 756 757 /* 758 * this is the packet being assembled, either data or frag control. 759 * Fragments go by 8 bytes, so this union must be 8 bytes long 760 */ 761 struct hole { 762 /* first_byte is address of this structure */ 763 u16 last_byte; /* last byte in this hole + 1 (begin of next hole) */ 764 u16 next_hole; /* index of next (in 8-b blocks), 0 == none */ 765 u16 prev_hole; /* index of prev, 0 == none */ 766 u16 unused; 767 }; 768 769 static struct ip_udp_hdr *__NetDefragment(struct ip_udp_hdr *ip, int *lenp) 770 { 771 static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN); 772 static u16 first_hole, total_len; 773 struct hole *payload, *thisfrag, *h, *newh; 774 struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff; 775 uchar *indata = (uchar *)ip; 776 int offset8, start, len, done = 0; 777 u16 ip_off = ntohs(ip->ip_off); 778 779 /* payload starts after IP header, this fragment is in there */ 780 payload = (struct hole *)(pkt_buff + IP_HDR_SIZE); 781 offset8 = (ip_off & IP_OFFS); 782 thisfrag = payload + offset8; 783 start = offset8 * 8; 784 len = ntohs(ip->ip_len) - IP_HDR_SIZE; 785 786 if (start + len > IP_MAXUDP) /* fragment extends too far */ 787 return NULL; 788 789 if (!total_len || localip->ip_id != ip->ip_id) { 790 /* new (or different) packet, reset structs */ 791 total_len = 0xffff; 792 payload[0].last_byte = ~0; 793 payload[0].next_hole = 0; 794 payload[0].prev_hole = 0; 795 first_hole = 0; 796 /* any IP header will work, copy the first we received */ 797 memcpy(localip, ip, IP_HDR_SIZE); 798 } 799 800 /* 801 * What follows is the reassembly algorithm. We use the payload 802 * array as a linked list of hole descriptors, as each hole starts 803 * at a multiple of 8 bytes. However, last byte can be whatever value, 804 * so it is represented as byte count, not as 8-byte blocks. 805 */ 806 807 h = payload + first_hole; 808 while (h->last_byte < start) { 809 if (!h->next_hole) { 810 /* no hole that far away */ 811 return NULL; 812 } 813 h = payload + h->next_hole; 814 } 815 816 /* last fragment may be 1..7 bytes, the "+7" forces acceptance */ 817 if (offset8 + ((len + 7) / 8) <= h - payload) { 818 /* no overlap with holes (dup fragment?) */ 819 return NULL; 820 } 821 822 if (!(ip_off & IP_FLAGS_MFRAG)) { 823 /* no more fragmentss: truncate this (last) hole */ 824 total_len = start + len; 825 h->last_byte = start + len; 826 } 827 828 /* 829 * There is some overlap: fix the hole list. This code doesn't 830 * deal with a fragment that overlaps with two different holes 831 * (thus being a superset of a previously-received fragment). 832 */ 833 834 if ((h >= thisfrag) && (h->last_byte <= start + len)) { 835 /* complete overlap with hole: remove hole */ 836 if (!h->prev_hole && !h->next_hole) { 837 /* last remaining hole */ 838 done = 1; 839 } else if (!h->prev_hole) { 840 /* first hole */ 841 first_hole = h->next_hole; 842 payload[h->next_hole].prev_hole = 0; 843 } else if (!h->next_hole) { 844 /* last hole */ 845 payload[h->prev_hole].next_hole = 0; 846 } else { 847 /* in the middle of the list */ 848 payload[h->next_hole].prev_hole = h->prev_hole; 849 payload[h->prev_hole].next_hole = h->next_hole; 850 } 851 852 } else if (h->last_byte <= start + len) { 853 /* overlaps with final part of the hole: shorten this hole */ 854 h->last_byte = start; 855 856 } else if (h >= thisfrag) { 857 /* overlaps with initial part of the hole: move this hole */ 858 newh = thisfrag + (len / 8); 859 *newh = *h; 860 h = newh; 861 if (h->next_hole) 862 payload[h->next_hole].prev_hole = (h - payload); 863 if (h->prev_hole) 864 payload[h->prev_hole].next_hole = (h - payload); 865 else 866 first_hole = (h - payload); 867 868 } else { 869 /* fragment sits in the middle: split the hole */ 870 newh = thisfrag + (len / 8); 871 *newh = *h; 872 h->last_byte = start; 873 h->next_hole = (newh - payload); 874 newh->prev_hole = (h - payload); 875 if (newh->next_hole) 876 payload[newh->next_hole].prev_hole = (newh - payload); 877 } 878 879 /* finally copy this fragment and possibly return whole packet */ 880 memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len); 881 if (!done) 882 return NULL; 883 884 localip->ip_len = htons(total_len); 885 *lenp = total_len + IP_HDR_SIZE; 886 return localip; 887 } 888 889 static inline struct ip_udp_hdr *NetDefragment(struct ip_udp_hdr *ip, int *lenp) 890 { 891 u16 ip_off = ntohs(ip->ip_off); 892 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) 893 return ip; /* not a fragment */ 894 return __NetDefragment(ip, lenp); 895 } 896 897 #else /* !CONFIG_IP_DEFRAG */ 898 899 static inline struct ip_udp_hdr *NetDefragment(struct ip_udp_hdr *ip, int *lenp) 900 { 901 u16 ip_off = ntohs(ip->ip_off); 902 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) 903 return ip; /* not a fragment */ 904 return NULL; 905 } 906 #endif 907 908 /** 909 * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently 910 * drop others. 911 * 912 * @parma ip IP packet containing the ICMP 913 */ 914 static void receive_icmp(struct ip_udp_hdr *ip, int len, 915 IPaddr_t src_ip, struct ethernet_hdr *et) 916 { 917 struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src; 918 919 switch (icmph->type) { 920 case ICMP_REDIRECT: 921 if (icmph->code != ICMP_REDIR_HOST) 922 return; 923 printf(" ICMP Host Redirect to %pI4 ", 924 &icmph->un.gateway); 925 break; 926 default: 927 #if defined(CONFIG_CMD_PING) 928 ping_receive(et, ip, len); 929 #endif 930 #ifdef CONFIG_CMD_TFTPPUT 931 if (packet_icmp_handler) 932 packet_icmp_handler(icmph->type, icmph->code, 933 ntohs(ip->udp_dst), src_ip, ntohs(ip->udp_src), 934 icmph->un.data, ntohs(ip->udp_len)); 935 #endif 936 break; 937 } 938 } 939 940 void 941 NetReceive(uchar *inpkt, int len) 942 { 943 struct ethernet_hdr *et; 944 struct ip_udp_hdr *ip; 945 IPaddr_t dst_ip; 946 IPaddr_t src_ip; 947 int eth_proto; 948 #if defined(CONFIG_CMD_CDP) 949 int iscdp; 950 #endif 951 ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid; 952 953 debug_cond(DEBUG_NET_PKT, "packet received\n"); 954 955 NetRxPacket = inpkt; 956 NetRxPacketLen = len; 957 et = (struct ethernet_hdr *)inpkt; 958 959 /* too small packet? */ 960 if (len < ETHER_HDR_SIZE) 961 return; 962 963 #ifdef CONFIG_API 964 if (push_packet) { 965 (*push_packet)(inpkt, len); 966 return; 967 } 968 #endif 969 970 #if defined(CONFIG_CMD_CDP) 971 /* keep track if packet is CDP */ 972 iscdp = is_cdp_packet(et->et_dest); 973 #endif 974 975 myvlanid = ntohs(NetOurVLAN); 976 if (myvlanid == (ushort)-1) 977 myvlanid = VLAN_NONE; 978 mynvlanid = ntohs(NetOurNativeVLAN); 979 if (mynvlanid == (ushort)-1) 980 mynvlanid = VLAN_NONE; 981 982 eth_proto = ntohs(et->et_protlen); 983 984 if (eth_proto < 1514) { 985 struct e802_hdr *et802 = (struct e802_hdr *)et; 986 /* 987 * Got a 802.2 packet. Check the other protocol field. 988 * XXX VLAN over 802.2+SNAP not implemented! 989 */ 990 eth_proto = ntohs(et802->et_prot); 991 992 ip = (struct ip_udp_hdr *)(inpkt + E802_HDR_SIZE); 993 len -= E802_HDR_SIZE; 994 995 } else if (eth_proto != PROT_VLAN) { /* normal packet */ 996 ip = (struct ip_udp_hdr *)(inpkt + ETHER_HDR_SIZE); 997 len -= ETHER_HDR_SIZE; 998 999 } else { /* VLAN packet */ 1000 struct vlan_ethernet_hdr *vet = 1001 (struct vlan_ethernet_hdr *)et; 1002 1003 debug_cond(DEBUG_NET_PKT, "VLAN packet received\n"); 1004 1005 /* too small packet? */ 1006 if (len < VLAN_ETHER_HDR_SIZE) 1007 return; 1008 1009 /* if no VLAN active */ 1010 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE 1011 #if defined(CONFIG_CMD_CDP) 1012 && iscdp == 0 1013 #endif 1014 ) 1015 return; 1016 1017 cti = ntohs(vet->vet_tag); 1018 vlanid = cti & VLAN_IDMASK; 1019 eth_proto = ntohs(vet->vet_type); 1020 1021 ip = (struct ip_udp_hdr *)(inpkt + VLAN_ETHER_HDR_SIZE); 1022 len -= VLAN_ETHER_HDR_SIZE; 1023 } 1024 1025 debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto); 1026 1027 #if defined(CONFIG_CMD_CDP) 1028 if (iscdp) { 1029 cdp_receive((uchar *)ip, len); 1030 return; 1031 } 1032 #endif 1033 1034 if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) { 1035 if (vlanid == VLAN_NONE) 1036 vlanid = (mynvlanid & VLAN_IDMASK); 1037 /* not matched? */ 1038 if (vlanid != (myvlanid & VLAN_IDMASK)) 1039 return; 1040 } 1041 1042 switch (eth_proto) { 1043 1044 case PROT_ARP: 1045 ArpReceive(et, ip, len); 1046 break; 1047 1048 #ifdef CONFIG_CMD_RARP 1049 case PROT_RARP: 1050 rarp_receive(ip, len); 1051 break; 1052 #endif 1053 case PROT_IP: 1054 debug_cond(DEBUG_NET_PKT, "Got IP\n"); 1055 /* Before we start poking the header, make sure it is there */ 1056 if (len < IP_UDP_HDR_SIZE) { 1057 debug("len bad %d < %lu\n", len, 1058 (ulong)IP_UDP_HDR_SIZE); 1059 return; 1060 } 1061 /* Check the packet length */ 1062 if (len < ntohs(ip->ip_len)) { 1063 debug("len bad %d < %d\n", len, ntohs(ip->ip_len)); 1064 return; 1065 } 1066 len = ntohs(ip->ip_len); 1067 debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n", 1068 len, ip->ip_hl_v & 0xff); 1069 1070 /* Can't deal with anything except IPv4 */ 1071 if ((ip->ip_hl_v & 0xf0) != 0x40) 1072 return; 1073 /* Can't deal with IP options (headers != 20 bytes) */ 1074 if ((ip->ip_hl_v & 0x0f) > 0x05) 1075 return; 1076 /* Check the Checksum of the header */ 1077 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE / 2)) { 1078 debug("checksum bad\n"); 1079 return; 1080 } 1081 /* If it is not for us, ignore it */ 1082 dst_ip = NetReadIP(&ip->ip_dst); 1083 if (NetOurIP && dst_ip != NetOurIP && dst_ip != 0xFFFFFFFF) { 1084 #ifdef CONFIG_MCAST_TFTP 1085 if (Mcast_addr != dst_ip) 1086 #endif 1087 return; 1088 } 1089 /* Read source IP address for later use */ 1090 src_ip = NetReadIP(&ip->ip_src); 1091 /* 1092 * The function returns the unchanged packet if it's not 1093 * a fragment, and either the complete packet or NULL if 1094 * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL) 1095 */ 1096 ip = NetDefragment(ip, &len); 1097 if (!ip) 1098 return; 1099 /* 1100 * watch for ICMP host redirects 1101 * 1102 * There is no real handler code (yet). We just watch 1103 * for ICMP host redirect messages. In case anybody 1104 * sees these messages: please contact me 1105 * (wd@denx.de), or - even better - send me the 1106 * necessary fixes :-) 1107 * 1108 * Note: in all cases where I have seen this so far 1109 * it was a problem with the router configuration, 1110 * for instance when a router was configured in the 1111 * BOOTP reply, but the TFTP server was on the same 1112 * subnet. So this is probably a warning that your 1113 * configuration might be wrong. But I'm not really 1114 * sure if there aren't any other situations. 1115 * 1116 * Simon Glass <sjg@chromium.org>: We get an ICMP when 1117 * we send a tftp packet to a dead connection, or when 1118 * there is no server at the other end. 1119 */ 1120 if (ip->ip_p == IPPROTO_ICMP) { 1121 receive_icmp(ip, len, src_ip, et); 1122 return; 1123 } else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */ 1124 return; 1125 } 1126 1127 debug_cond(DEBUG_DEV_PKT, 1128 "received UDP (to=%pI4, from=%pI4, len=%d)\n", 1129 &dst_ip, &src_ip, len); 1130 1131 #ifdef CONFIG_UDP_CHECKSUM 1132 if (ip->udp_xsum != 0) { 1133 ulong xsum; 1134 ushort *sumptr; 1135 ushort sumlen; 1136 1137 xsum = ip->ip_p; 1138 xsum += (ntohs(ip->udp_len)); 1139 xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff; 1140 xsum += (ntohl(ip->ip_src) >> 0) & 0x0000ffff; 1141 xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff; 1142 xsum += (ntohl(ip->ip_dst) >> 0) & 0x0000ffff; 1143 1144 sumlen = ntohs(ip->udp_len); 1145 sumptr = (ushort *) &(ip->udp_src); 1146 1147 while (sumlen > 1) { 1148 ushort sumdata; 1149 1150 sumdata = *sumptr++; 1151 xsum += ntohs(sumdata); 1152 sumlen -= 2; 1153 } 1154 if (sumlen > 0) { 1155 ushort sumdata; 1156 1157 sumdata = *(unsigned char *) sumptr; 1158 sumdata = (sumdata << 8) & 0xff00; 1159 xsum += sumdata; 1160 } 1161 while ((xsum >> 16) != 0) { 1162 xsum = (xsum & 0x0000ffff) + 1163 ((xsum >> 16) & 0x0000ffff); 1164 } 1165 if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) { 1166 printf(" UDP wrong checksum %08lx %08x\n", 1167 xsum, ntohs(ip->udp_xsum)); 1168 return; 1169 } 1170 } 1171 #endif 1172 1173 1174 #ifdef CONFIG_NETCONSOLE 1175 nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE, 1176 src_ip, 1177 ntohs(ip->udp_dst), 1178 ntohs(ip->udp_src), 1179 ntohs(ip->udp_len) - UDP_HDR_SIZE); 1180 #endif 1181 /* 1182 * IP header OK. Pass the packet to the current handler. 1183 */ 1184 (*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE, 1185 ntohs(ip->udp_dst), 1186 src_ip, 1187 ntohs(ip->udp_src), 1188 ntohs(ip->udp_len) - UDP_HDR_SIZE); 1189 break; 1190 } 1191 } 1192 1193 1194 /**********************************************************************/ 1195 1196 static int net_check_prereq(enum proto_t protocol) 1197 { 1198 switch (protocol) { 1199 /* Fall through */ 1200 #if defined(CONFIG_CMD_PING) 1201 case PING: 1202 if (NetPingIP == 0) { 1203 puts("*** ERROR: ping address not given\n"); 1204 return 1; 1205 } 1206 goto common; 1207 #endif 1208 #if defined(CONFIG_CMD_SNTP) 1209 case SNTP: 1210 if (NetNtpServerIP == 0) { 1211 puts("*** ERROR: NTP server address not given\n"); 1212 return 1; 1213 } 1214 goto common; 1215 #endif 1216 #if defined(CONFIG_CMD_DNS) 1217 case DNS: 1218 if (NetOurDNSIP == 0) { 1219 puts("*** ERROR: DNS server address not given\n"); 1220 return 1; 1221 } 1222 goto common; 1223 #endif 1224 #if defined(CONFIG_CMD_NFS) 1225 case NFS: 1226 #endif 1227 case TFTPGET: 1228 case TFTPPUT: 1229 if (NetServerIP == 0) { 1230 puts("*** ERROR: `serverip' not set\n"); 1231 return 1; 1232 } 1233 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \ 1234 defined(CONFIG_CMD_DNS) 1235 common: 1236 #endif 1237 /* Fall through */ 1238 1239 case NETCONS: 1240 case TFTPSRV: 1241 if (NetOurIP == 0) { 1242 puts("*** ERROR: `ipaddr' not set\n"); 1243 return 1; 1244 } 1245 /* Fall through */ 1246 1247 #ifdef CONFIG_CMD_RARP 1248 case RARP: 1249 #endif 1250 case BOOTP: 1251 case CDP: 1252 case DHCP: 1253 case LINKLOCAL: 1254 if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) { 1255 int num = eth_get_dev_index(); 1256 1257 switch (num) { 1258 case -1: 1259 puts("*** ERROR: No ethernet found.\n"); 1260 return 1; 1261 case 0: 1262 puts("*** ERROR: `ethaddr' not set\n"); 1263 break; 1264 default: 1265 printf("*** ERROR: `eth%daddr' not set\n", 1266 num); 1267 break; 1268 } 1269 1270 NetStartAgain(); 1271 return 2; 1272 } 1273 /* Fall through */ 1274 default: 1275 return 0; 1276 } 1277 return 0; /* OK */ 1278 } 1279 /**********************************************************************/ 1280 1281 int 1282 NetCksumOk(uchar *ptr, int len) 1283 { 1284 return !((NetCksum(ptr, len) + 1) & 0xfffe); 1285 } 1286 1287 1288 unsigned 1289 NetCksum(uchar *ptr, int len) 1290 { 1291 ulong xsum; 1292 ushort *p = (ushort *)ptr; 1293 1294 xsum = 0; 1295 while (len-- > 0) 1296 xsum += *p++; 1297 xsum = (xsum & 0xffff) + (xsum >> 16); 1298 xsum = (xsum & 0xffff) + (xsum >> 16); 1299 return xsum & 0xffff; 1300 } 1301 1302 int 1303 NetEthHdrSize(void) 1304 { 1305 ushort myvlanid; 1306 1307 myvlanid = ntohs(NetOurVLAN); 1308 if (myvlanid == (ushort)-1) 1309 myvlanid = VLAN_NONE; 1310 1311 return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : 1312 VLAN_ETHER_HDR_SIZE; 1313 } 1314 1315 int 1316 NetSetEther(uchar *xet, uchar * addr, uint prot) 1317 { 1318 struct ethernet_hdr *et = (struct ethernet_hdr *)xet; 1319 ushort myvlanid; 1320 1321 myvlanid = ntohs(NetOurVLAN); 1322 if (myvlanid == (ushort)-1) 1323 myvlanid = VLAN_NONE; 1324 1325 memcpy(et->et_dest, addr, 6); 1326 memcpy(et->et_src, NetOurEther, 6); 1327 if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) { 1328 et->et_protlen = htons(prot); 1329 return ETHER_HDR_SIZE; 1330 } else { 1331 struct vlan_ethernet_hdr *vet = 1332 (struct vlan_ethernet_hdr *)xet; 1333 1334 vet->vet_vlan_type = htons(PROT_VLAN); 1335 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK)); 1336 vet->vet_type = htons(prot); 1337 return VLAN_ETHER_HDR_SIZE; 1338 } 1339 } 1340 1341 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot) 1342 { 1343 ushort protlen; 1344 1345 memcpy(et->et_dest, addr, 6); 1346 memcpy(et->et_src, NetOurEther, 6); 1347 protlen = ntohs(et->et_protlen); 1348 if (protlen == PROT_VLAN) { 1349 struct vlan_ethernet_hdr *vet = 1350 (struct vlan_ethernet_hdr *)et; 1351 vet->vet_type = htons(prot); 1352 return VLAN_ETHER_HDR_SIZE; 1353 } else if (protlen > 1514) { 1354 et->et_protlen = htons(prot); 1355 return ETHER_HDR_SIZE; 1356 } else { 1357 /* 802.2 + SNAP */ 1358 struct e802_hdr *et802 = (struct e802_hdr *)et; 1359 et802->et_prot = htons(prot); 1360 return E802_HDR_SIZE; 1361 } 1362 } 1363 1364 void net_set_ip_header(uchar *pkt, IPaddr_t dest, IPaddr_t source) 1365 { 1366 struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt; 1367 1368 /* 1369 * Construct an IP header. 1370 */ 1371 /* IP_HDR_SIZE / 4 (not including UDP) */ 1372 ip->ip_hl_v = 0x45; 1373 ip->ip_tos = 0; 1374 ip->ip_len = htons(IP_HDR_SIZE); 1375 ip->ip_id = htons(NetIPID++); 1376 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ 1377 ip->ip_ttl = 255; 1378 ip->ip_sum = 0; 1379 /* already in network byte order */ 1380 NetCopyIP((void *)&ip->ip_src, &source); 1381 /* already in network byte order */ 1382 NetCopyIP((void *)&ip->ip_dst, &dest); 1383 } 1384 1385 void net_set_udp_header(uchar *pkt, IPaddr_t dest, int dport, int sport, 1386 int len) 1387 { 1388 struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt; 1389 1390 /* 1391 * If the data is an odd number of bytes, zero the 1392 * byte after the last byte so that the checksum 1393 * will work. 1394 */ 1395 if (len & 1) 1396 pkt[IP_UDP_HDR_SIZE + len] = 0; 1397 1398 net_set_ip_header(pkt, dest, NetOurIP); 1399 ip->ip_len = htons(IP_UDP_HDR_SIZE + len); 1400 ip->ip_p = IPPROTO_UDP; 1401 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE >> 1); 1402 1403 ip->udp_src = htons(sport); 1404 ip->udp_dst = htons(dport); 1405 ip->udp_len = htons(UDP_HDR_SIZE + len); 1406 ip->udp_xsum = 0; 1407 } 1408 1409 void copy_filename(char *dst, const char *src, int size) 1410 { 1411 if (*src && (*src == '"')) { 1412 ++src; 1413 --size; 1414 } 1415 1416 while ((--size > 0) && *src && (*src != '"')) 1417 *dst++ = *src++; 1418 *dst = '\0'; 1419 } 1420 1421 #if defined(CONFIG_CMD_NFS) || \ 1422 defined(CONFIG_CMD_SNTP) || \ 1423 defined(CONFIG_CMD_DNS) 1424 /* 1425 * make port a little random (1024-17407) 1426 * This keeps the math somewhat trivial to compute, and seems to work with 1427 * all supported protocols/clients/servers 1428 */ 1429 unsigned int random_port(void) 1430 { 1431 return 1024 + (get_timer(0) % 0x4000); 1432 } 1433 #endif 1434 1435 void ip_to_string(IPaddr_t x, char *s) 1436 { 1437 x = ntohl(x); 1438 sprintf(s, "%d.%d.%d.%d", 1439 (int) ((x >> 24) & 0xff), 1440 (int) ((x >> 16) & 0xff), 1441 (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff) 1442 ); 1443 } 1444 1445 void VLAN_to_string(ushort x, char *s) 1446 { 1447 x = ntohs(x); 1448 1449 if (x == (ushort)-1) 1450 x = VLAN_NONE; 1451 1452 if (x == VLAN_NONE) 1453 strcpy(s, "none"); 1454 else 1455 sprintf(s, "%d", x & VLAN_IDMASK); 1456 } 1457 1458 ushort string_to_VLAN(const char *s) 1459 { 1460 ushort id; 1461 1462 if (s == NULL) 1463 return htons(VLAN_NONE); 1464 1465 if (*s < '0' || *s > '9') 1466 id = VLAN_NONE; 1467 else 1468 id = (ushort)simple_strtoul(s, NULL, 10); 1469 1470 return htons(id); 1471 } 1472 1473 ushort getenv_VLAN(char *var) 1474 { 1475 return string_to_VLAN(getenv(var)); 1476 } 1477