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 * RARP: 27 * 28 * Prerequisites: - own ethernet address 29 * We want: - own IP address 30 * - TFTP server IP address 31 * Next step: ARP 32 * 33 * ARP: 34 * 35 * Prerequisites: - own ethernet address 36 * - own IP address 37 * - TFTP server IP address 38 * We want: - TFTP server ethernet address 39 * Next step: TFTP 40 * 41 * DHCP: 42 * 43 * Prerequisites: - own ethernet address 44 * We want: - IP, Netmask, ServerIP, Gateway IP 45 * - bootfilename, lease time 46 * Next step: - TFTP 47 * 48 * TFTP: 49 * 50 * Prerequisites: - own ethernet address 51 * - own IP address 52 * - TFTP server IP address 53 * - TFTP server ethernet address 54 * - name of bootfile (if unknown, we use a default name 55 * derived from our own IP address) 56 * We want: - load the boot file 57 * Next step: none 58 * 59 * NFS: 60 * 61 * Prerequisites: - own ethernet address 62 * - own IP address 63 * - name of bootfile (if unknown, we use a default name 64 * derived from our own IP address) 65 * We want: - load the boot file 66 * Next step: none 67 * 68 * SNTP: 69 * 70 * Prerequisites: - own ethernet address 71 * - own IP address 72 * We want: - network time 73 * Next step: none 74 */ 75 76 77 #include <common.h> 78 #include <watchdog.h> 79 #include <command.h> 80 #include <linux/compiler.h> 81 #include <net.h> 82 #include "arp.h" 83 #include "bootp.h" 84 #include "tftp.h" 85 #ifdef CONFIG_CMD_RARP 86 #include "rarp.h" 87 #endif 88 #include "nfs.h" 89 #ifdef CONFIG_STATUS_LED 90 #include <status_led.h> 91 #include <miiphy.h> 92 #endif 93 #if defined(CONFIG_CMD_SNTP) 94 #include "sntp.h" 95 #endif 96 #include "cdp.h" 97 #if defined(CONFIG_CMD_DNS) 98 #include "dns.h" 99 #endif 100 101 DECLARE_GLOBAL_DATA_PTR; 102 103 /** BOOTP EXTENTIONS **/ 104 105 /* Our subnet mask (0=unknown) */ 106 IPaddr_t NetOurSubnetMask; 107 /* Our gateways IP address */ 108 IPaddr_t NetOurGatewayIP; 109 /* Our DNS IP address */ 110 IPaddr_t NetOurDNSIP; 111 #if defined(CONFIG_BOOTP_DNS2) 112 /* Our 2nd DNS IP address */ 113 IPaddr_t NetOurDNS2IP; 114 #endif 115 /* Our NIS domain */ 116 char NetOurNISDomain[32] = {0,}; 117 /* Our hostname */ 118 char NetOurHostName[32] = {0,}; 119 /* Our bootpath */ 120 char NetOurRootPath[64] = {0,}; 121 /* Our bootfile size in blocks */ 122 ushort NetBootFileSize; 123 124 #ifdef CONFIG_MCAST_TFTP /* Multicast TFTP */ 125 IPaddr_t Mcast_addr; 126 #endif 127 128 /** END OF BOOTP EXTENTIONS **/ 129 130 /* The actual transferred size of the bootfile (in bytes) */ 131 ulong NetBootFileXferSize; 132 /* Our ethernet address */ 133 uchar NetOurEther[6]; 134 /* Boot server enet address */ 135 uchar NetServerEther[6]; 136 /* Our IP addr (0 = unknown) */ 137 IPaddr_t NetOurIP; 138 /* Server IP addr (0 = unknown) */ 139 IPaddr_t NetServerIP; 140 /* Current receive packet */ 141 uchar *NetRxPacket; 142 /* Current rx packet length */ 143 int NetRxPacketLen; 144 /* IP packet ID */ 145 unsigned NetIPID; 146 /* Ethernet bcast address */ 147 uchar NetBcastAddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 148 uchar NetEtherNullAddr[6]; 149 #ifdef CONFIG_API 150 void (*push_packet)(void *, int len) = 0; 151 #endif 152 /* Network loop state */ 153 int NetState; 154 /* Tried all network devices */ 155 int NetRestartWrap; 156 /* Network loop restarted */ 157 static int NetRestarted; 158 /* At least one device configured */ 159 static int NetDevExists; 160 161 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */ 162 /* default is without VLAN */ 163 ushort NetOurVLAN = 0xFFFF; 164 /* ditto */ 165 ushort NetOurNativeVLAN = 0xFFFF; 166 167 /* Boot File name */ 168 char BootFile[128]; 169 170 #if defined(CONFIG_CMD_PING) 171 /* the ip address to ping */ 172 IPaddr_t NetPingIP; 173 174 static void PingStart(void); 175 #endif 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 uchar PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN]; 185 186 /* Receive packet */ 187 uchar *NetRxPackets[PKTBUFSRX]; 188 189 /* Current RX packet handler */ 190 static rxhand_f *packetHandler; 191 #ifdef CONFIG_CMD_TFTPPUT 192 static rxhand_icmp_f *packet_icmp_handler; /* Current ICMP rx handler */ 193 #endif 194 /* Current timeout handler */ 195 static thand_f *timeHandler; 196 /* Time base value */ 197 static ulong timeStart; 198 /* Current timeout value */ 199 static ulong timeDelta; 200 /* THE transmit packet */ 201 uchar *NetTxPacket; 202 203 static int net_check_prereq(enum proto_t protocol); 204 205 static int NetTryCount; 206 207 /**********************************************************************/ 208 209 /* 210 * Check if autoload is enabled. If so, use either NFS or TFTP to download 211 * the boot file. 212 */ 213 void net_auto_load(void) 214 { 215 const char *s = getenv("autoload"); 216 217 if (s != NULL) { 218 if (*s == 'n') { 219 /* 220 * Just use BOOTP/RARP to configure system; 221 * Do not use TFTP to load the bootfile. 222 */ 223 NetState = NETLOOP_SUCCESS; 224 return; 225 } 226 #if defined(CONFIG_CMD_NFS) 227 if (strcmp(s, "NFS") == 0) { 228 /* 229 * Use NFS to load the bootfile. 230 */ 231 NfsStart(); 232 return; 233 } 234 #endif 235 } 236 TftpStart(TFTPGET); 237 } 238 239 static void NetInitLoop(enum proto_t protocol) 240 { 241 static int env_changed_id; 242 int env_id = get_env_id(); 243 244 /* update only when the environment has changed */ 245 if (env_changed_id != env_id) { 246 NetOurIP = getenv_IPaddr("ipaddr"); 247 NetOurGatewayIP = getenv_IPaddr("gatewayip"); 248 NetOurSubnetMask = getenv_IPaddr("netmask"); 249 NetServerIP = getenv_IPaddr("serverip"); 250 NetOurNativeVLAN = getenv_VLAN("nvlan"); 251 NetOurVLAN = getenv_VLAN("vlan"); 252 #if defined(CONFIG_CMD_DNS) 253 NetOurDNSIP = getenv_IPaddr("dnsip"); 254 #endif 255 env_changed_id = env_id; 256 } 257 258 return; 259 } 260 261 /**********************************************************************/ 262 /* 263 * Main network processing loop. 264 */ 265 266 int NetLoop(enum proto_t protocol) 267 { 268 bd_t *bd = gd->bd; 269 int ret = -1; 270 271 NetRestarted = 0; 272 NetDevExists = 0; 273 274 NetTxPacket = NULL; 275 NetTryCount = 1; 276 277 ArpInit(); 278 279 if (!NetTxPacket) { 280 int i; 281 /* 282 * Setup packet buffers, aligned correctly. 283 */ 284 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1); 285 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN; 286 for (i = 0; i < PKTBUFSRX; i++) 287 NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN; 288 } 289 290 bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start"); 291 eth_halt(); 292 eth_set_current(); 293 if (eth_init(bd) < 0) { 294 eth_halt(); 295 return -1; 296 } 297 298 restart: 299 memcpy(NetOurEther, eth_get_dev()->enetaddr, 6); 300 301 NetState = NETLOOP_CONTINUE; 302 303 /* 304 * Start the ball rolling with the given start function. From 305 * here on, this code is a state machine driven by received 306 * packets and timer events. 307 */ 308 NetInitLoop(protocol); 309 310 switch (net_check_prereq(protocol)) { 311 case 1: 312 /* network not configured */ 313 eth_halt(); 314 return -1; 315 316 case 2: 317 /* network device not configured */ 318 break; 319 320 case 0: 321 NetDevExists = 1; 322 NetBootFileXferSize = 0; 323 switch (protocol) { 324 case TFTPGET: 325 #ifdef CONFIG_CMD_TFTPPUT 326 case TFTPPUT: 327 #endif 328 /* always use ARP to get server ethernet address */ 329 TftpStart(protocol); 330 break; 331 #ifdef CONFIG_CMD_TFTPSRV 332 case TFTPSRV: 333 TftpStartServer(); 334 break; 335 #endif 336 #if defined(CONFIG_CMD_DHCP) 337 case DHCP: 338 BootpTry = 0; 339 NetOurIP = 0; 340 DhcpRequest(); /* Basically same as BOOTP */ 341 break; 342 #endif 343 344 case BOOTP: 345 BootpTry = 0; 346 NetOurIP = 0; 347 BootpRequest(); 348 break; 349 350 #if defined(CONFIG_CMD_RARP) 351 case RARP: 352 RarpTry = 0; 353 NetOurIP = 0; 354 RarpRequest(); 355 break; 356 #endif 357 #if defined(CONFIG_CMD_PING) 358 case PING: 359 PingStart(); 360 break; 361 #endif 362 #if defined(CONFIG_CMD_NFS) 363 case NFS: 364 NfsStart(); 365 break; 366 #endif 367 #if defined(CONFIG_CMD_CDP) 368 case CDP: 369 CDPStart(); 370 break; 371 #endif 372 #ifdef CONFIG_NETCONSOLE 373 case NETCONS: 374 NcStart(); 375 break; 376 #endif 377 #if defined(CONFIG_CMD_SNTP) 378 case SNTP: 379 SntpStart(); 380 break; 381 #endif 382 #if defined(CONFIG_CMD_DNS) 383 case DNS: 384 DnsStart(); 385 break; 386 #endif 387 default: 388 break; 389 } 390 391 break; 392 } 393 394 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 395 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ 396 defined(CONFIG_STATUS_LED) && \ 397 defined(STATUS_LED_RED) 398 /* 399 * Echo the inverted link state to the fault LED. 400 */ 401 if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) 402 status_led_set(STATUS_LED_RED, STATUS_LED_OFF); 403 else 404 status_led_set(STATUS_LED_RED, STATUS_LED_ON); 405 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 406 #endif /* CONFIG_MII, ... */ 407 408 /* 409 * Main packet reception loop. Loop receiving packets until 410 * someone sets `NetState' to a state that terminates. 411 */ 412 for (;;) { 413 WATCHDOG_RESET(); 414 #ifdef CONFIG_SHOW_ACTIVITY 415 show_activity(1); 416 #endif 417 /* 418 * Check the ethernet for a new packet. The ethernet 419 * receive routine will process it. 420 */ 421 eth_rx(); 422 423 /* 424 * Abort if ctrl-c was pressed. 425 */ 426 if (ctrlc()) { 427 eth_halt(); 428 puts("\nAbort\n"); 429 goto done; 430 } 431 432 ArpTimeoutCheck(); 433 434 /* 435 * Check for a timeout, and run the timeout handler 436 * if we have one. 437 */ 438 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) { 439 thand_f *x; 440 441 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 442 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ 443 defined(CONFIG_STATUS_LED) && \ 444 defined(STATUS_LED_RED) 445 /* 446 * Echo the inverted link state to the fault LED. 447 */ 448 if (miiphy_link(eth_get_dev()->name, 449 CONFIG_SYS_FAULT_MII_ADDR)) { 450 status_led_set(STATUS_LED_RED, STATUS_LED_OFF); 451 } else { 452 status_led_set(STATUS_LED_RED, STATUS_LED_ON); 453 } 454 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 455 #endif /* CONFIG_MII, ... */ 456 x = timeHandler; 457 timeHandler = (thand_f *)0; 458 (*x)(); 459 } 460 461 462 switch (NetState) { 463 464 case NETLOOP_RESTART: 465 NetRestarted = 1; 466 goto restart; 467 468 case NETLOOP_SUCCESS: 469 if (NetBootFileXferSize > 0) { 470 char buf[20]; 471 printf("Bytes transferred = %ld (%lx hex)\n", 472 NetBootFileXferSize, 473 NetBootFileXferSize); 474 sprintf(buf, "%lX", NetBootFileXferSize); 475 setenv("filesize", buf); 476 477 sprintf(buf, "%lX", (unsigned long)load_addr); 478 setenv("fileaddr", buf); 479 } 480 eth_halt(); 481 ret = NetBootFileXferSize; 482 goto done; 483 484 case NETLOOP_FAIL: 485 goto done; 486 } 487 } 488 489 done: 490 #ifdef CONFIG_CMD_TFTPPUT 491 /* Clear out the handlers */ 492 NetSetHandler(NULL); 493 net_set_icmp_handler(NULL); 494 #endif 495 return ret; 496 } 497 498 /**********************************************************************/ 499 500 static void 501 startAgainTimeout(void) 502 { 503 NetState = NETLOOP_RESTART; 504 } 505 506 static void 507 startAgainHandler(uchar *pkt, unsigned dest, IPaddr_t sip, 508 unsigned src, unsigned len) 509 { 510 /* Totally ignore the packet */ 511 } 512 513 void NetStartAgain(void) 514 { 515 char *nretry; 516 int retry_forever = 0; 517 unsigned long retrycnt = 0; 518 519 nretry = getenv("netretry"); 520 if (nretry) { 521 if (!strcmp(nretry, "yes")) 522 retry_forever = 1; 523 else if (!strcmp(nretry, "no")) 524 retrycnt = 0; 525 else if (!strcmp(nretry, "once")) 526 retrycnt = 1; 527 else 528 retrycnt = simple_strtoul(nretry, NULL, 0); 529 } else 530 retry_forever = 1; 531 532 if ((!retry_forever) && (NetTryCount >= retrycnt)) { 533 eth_halt(); 534 NetState = NETLOOP_FAIL; 535 return; 536 } 537 538 NetTryCount++; 539 540 eth_halt(); 541 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER) 542 eth_try_another(!NetRestarted); 543 #endif 544 eth_init(gd->bd); 545 if (NetRestartWrap) { 546 NetRestartWrap = 0; 547 if (NetDevExists) { 548 NetSetTimeout(10000UL, startAgainTimeout); 549 NetSetHandler(startAgainHandler); 550 } else { 551 NetState = NETLOOP_FAIL; 552 } 553 } else { 554 NetState = NETLOOP_RESTART; 555 } 556 } 557 558 /**********************************************************************/ 559 /* 560 * Miscelaneous bits. 561 */ 562 563 rxhand_f * 564 NetGetHandler(void) 565 { 566 return packetHandler; 567 } 568 569 570 void 571 NetSetHandler(rxhand_f *f) 572 { 573 packetHandler = f; 574 } 575 576 #ifdef CONFIG_CMD_TFTPPUT 577 void net_set_icmp_handler(rxhand_icmp_f *f) 578 { 579 packet_icmp_handler = f; 580 } 581 #endif 582 583 void 584 NetSetTimeout(ulong iv, thand_f *f) 585 { 586 if (iv == 0) { 587 timeHandler = (thand_f *)0; 588 } else { 589 timeHandler = f; 590 timeStart = get_timer(0); 591 timeDelta = iv; 592 } 593 } 594 595 596 void 597 NetSendPacket(uchar *pkt, int len) 598 { 599 (void) eth_send(pkt, len); 600 } 601 602 int 603 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len) 604 { 605 uchar *pkt; 606 607 /* convert to new style broadcast */ 608 if (dest == 0) 609 dest = 0xFFFFFFFF; 610 611 /* if broadcast, make the ether address a broadcast and don't do ARP */ 612 if (dest == 0xFFFFFFFF) 613 ether = NetBcastAddr; 614 615 /* 616 * if MAC address was not discovered yet, save the packet and do 617 * an ARP request 618 */ 619 if (memcmp(ether, NetEtherNullAddr, 6) == 0) { 620 621 debug("sending ARP for %08x\n", dest); 622 623 NetArpWaitPacketIP = dest; 624 NetArpWaitPacketMAC = ether; 625 626 pkt = NetArpWaitTxPacket; 627 pkt += NetSetEther(pkt, NetArpWaitPacketMAC, PROT_IP); 628 629 NetSetIP(pkt, dest, dport, sport, len); 630 memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket + 631 (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len); 632 633 /* size of the waiting packet */ 634 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) + 635 IP_HDR_SIZE + len; 636 637 /* and do the ARP request */ 638 NetArpWaitTry = 1; 639 NetArpWaitTimerStart = get_timer(0); 640 ArpRequest(); 641 return 1; /* waiting */ 642 } 643 644 debug("sending UDP to %08x/%pM\n", dest, ether); 645 646 pkt = (uchar *)NetTxPacket; 647 pkt += NetSetEther(pkt, ether, PROT_IP); 648 NetSetIP(pkt, dest, dport, sport, len); 649 (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len); 650 651 return 0; /* transmitted */ 652 } 653 654 #if defined(CONFIG_CMD_PING) 655 static ushort PingSeqNo; 656 657 int PingSend(void) 658 { 659 static uchar mac[6]; 660 IP_t *ip; 661 ushort *s; 662 uchar *pkt; 663 664 /* XXX always send arp request */ 665 666 memcpy(mac, NetEtherNullAddr, 6); 667 668 debug("sending ARP for %08x\n", NetPingIP); 669 670 NetArpWaitPacketIP = NetPingIP; 671 NetArpWaitPacketMAC = mac; 672 673 pkt = NetArpWaitTxPacket; 674 pkt += NetSetEther(pkt, mac, PROT_IP); 675 676 ip = (IP_t *)pkt; 677 678 /* 679 * Construct an IP and ICMP header. 680 * (need to set no fragment bit - XXX) 681 */ 682 /* IP_HDR_SIZE / 4 (not including UDP) */ 683 ip->ip_hl_v = 0x45; 684 ip->ip_tos = 0; 685 ip->ip_len = htons(IP_HDR_SIZE_NO_UDP + 8); 686 ip->ip_id = htons(NetIPID++); 687 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ 688 ip->ip_ttl = 255; 689 ip->ip_p = 0x01; /* ICMP */ 690 ip->ip_sum = 0; 691 /* already in network byte order */ 692 NetCopyIP((void *)&ip->ip_src, &NetOurIP); 693 /* - "" - */ 694 NetCopyIP((void *)&ip->ip_dst, &NetPingIP); 695 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2); 696 697 s = &ip->udp_src; /* XXX ICMP starts here */ 698 s[0] = htons(0x0800); /* echo-request, code */ 699 s[1] = 0; /* checksum */ 700 s[2] = 0; /* identifier */ 701 s[3] = htons(PingSeqNo++); /* sequence number */ 702 s[1] = ~NetCksum((uchar *)s, 8/2); 703 704 /* size of the waiting packet */ 705 NetArpWaitTxPacketSize = 706 (pkt - NetArpWaitTxPacket) + IP_HDR_SIZE_NO_UDP + 8; 707 708 /* and do the ARP request */ 709 NetArpWaitTry = 1; 710 NetArpWaitTimerStart = get_timer(0); 711 ArpRequest(); 712 return 1; /* waiting */ 713 } 714 715 static void 716 PingTimeout(void) 717 { 718 eth_halt(); 719 NetState = NETLOOP_FAIL; /* we did not get the reply */ 720 } 721 722 static void 723 PingHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, 724 unsigned len) 725 { 726 if (sip != NetPingIP) 727 return; 728 729 NetState = NETLOOP_SUCCESS; 730 } 731 732 static void PingStart(void) 733 { 734 printf("Using %s device\n", eth_get_name()); 735 NetSetTimeout(10000UL, PingTimeout); 736 NetSetHandler(PingHandler); 737 738 PingSend(); 739 } 740 #endif 741 742 #ifdef CONFIG_IP_DEFRAG 743 /* 744 * This function collects fragments in a single packet, according 745 * to the algorithm in RFC815. It returns NULL or the pointer to 746 * a complete packet, in static storage 747 */ 748 #ifndef CONFIG_NET_MAXDEFRAG 749 #define CONFIG_NET_MAXDEFRAG 16384 750 #endif 751 /* 752 * MAXDEFRAG, above, is chosen in the config file and is real data 753 * so we need to add the NFS overhead, which is more than TFTP. 754 * To use sizeof in the internal unnamed structures, we need a real 755 * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately). 756 * The compiler doesn't complain nor allocates the actual structure 757 */ 758 static struct rpc_t rpc_specimen; 759 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply)) 760 761 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE_NO_UDP) 762 763 /* 764 * this is the packet being assembled, either data or frag control. 765 * Fragments go by 8 bytes, so this union must be 8 bytes long 766 */ 767 struct hole { 768 /* first_byte is address of this structure */ 769 u16 last_byte; /* last byte in this hole + 1 (begin of next hole) */ 770 u16 next_hole; /* index of next (in 8-b blocks), 0 == none */ 771 u16 prev_hole; /* index of prev, 0 == none */ 772 u16 unused; 773 }; 774 775 static IP_t *__NetDefragment(IP_t *ip, int *lenp) 776 { 777 static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN); 778 static u16 first_hole, total_len; 779 struct hole *payload, *thisfrag, *h, *newh; 780 IP_t *localip = (IP_t *)pkt_buff; 781 uchar *indata = (uchar *)ip; 782 int offset8, start, len, done = 0; 783 u16 ip_off = ntohs(ip->ip_off); 784 785 /* payload starts after IP header, this fragment is in there */ 786 payload = (struct hole *)(pkt_buff + IP_HDR_SIZE_NO_UDP); 787 offset8 = (ip_off & IP_OFFS); 788 thisfrag = payload + offset8; 789 start = offset8 * 8; 790 len = ntohs(ip->ip_len) - IP_HDR_SIZE_NO_UDP; 791 792 if (start + len > IP_MAXUDP) /* fragment extends too far */ 793 return NULL; 794 795 if (!total_len || localip->ip_id != ip->ip_id) { 796 /* new (or different) packet, reset structs */ 797 total_len = 0xffff; 798 payload[0].last_byte = ~0; 799 payload[0].next_hole = 0; 800 payload[0].prev_hole = 0; 801 first_hole = 0; 802 /* any IP header will work, copy the first we received */ 803 memcpy(localip, ip, IP_HDR_SIZE_NO_UDP); 804 } 805 806 /* 807 * What follows is the reassembly algorithm. We use the payload 808 * array as a linked list of hole descriptors, as each hole starts 809 * at a multiple of 8 bytes. However, last byte can be whatever value, 810 * so it is represented as byte count, not as 8-byte blocks. 811 */ 812 813 h = payload + first_hole; 814 while (h->last_byte < start) { 815 if (!h->next_hole) { 816 /* no hole that far away */ 817 return NULL; 818 } 819 h = payload + h->next_hole; 820 } 821 822 /* last fragment may be 1..7 bytes, the "+7" forces acceptance */ 823 if (offset8 + ((len + 7) / 8) <= h - payload) { 824 /* no overlap with holes (dup fragment?) */ 825 return NULL; 826 } 827 828 if (!(ip_off & IP_FLAGS_MFRAG)) { 829 /* no more fragmentss: truncate this (last) hole */ 830 total_len = start + len; 831 h->last_byte = start + len; 832 } 833 834 /* 835 * There is some overlap: fix the hole list. This code doesn't 836 * deal with a fragment that overlaps with two different holes 837 * (thus being a superset of a previously-received fragment). 838 */ 839 840 if ((h >= thisfrag) && (h->last_byte <= start + len)) { 841 /* complete overlap with hole: remove hole */ 842 if (!h->prev_hole && !h->next_hole) { 843 /* last remaining hole */ 844 done = 1; 845 } else if (!h->prev_hole) { 846 /* first hole */ 847 first_hole = h->next_hole; 848 payload[h->next_hole].prev_hole = 0; 849 } else if (!h->next_hole) { 850 /* last hole */ 851 payload[h->prev_hole].next_hole = 0; 852 } else { 853 /* in the middle of the list */ 854 payload[h->next_hole].prev_hole = h->prev_hole; 855 payload[h->prev_hole].next_hole = h->next_hole; 856 } 857 858 } else if (h->last_byte <= start + len) { 859 /* overlaps with final part of the hole: shorten this hole */ 860 h->last_byte = start; 861 862 } else if (h >= thisfrag) { 863 /* overlaps with initial part of the hole: move this hole */ 864 newh = thisfrag + (len / 8); 865 *newh = *h; 866 h = newh; 867 if (h->next_hole) 868 payload[h->next_hole].prev_hole = (h - payload); 869 if (h->prev_hole) 870 payload[h->prev_hole].next_hole = (h - payload); 871 else 872 first_hole = (h - payload); 873 874 } else { 875 /* fragment sits in the middle: split the hole */ 876 newh = thisfrag + (len / 8); 877 *newh = *h; 878 h->last_byte = start; 879 h->next_hole = (newh - payload); 880 newh->prev_hole = (h - payload); 881 if (newh->next_hole) 882 payload[newh->next_hole].prev_hole = (newh - payload); 883 } 884 885 /* finally copy this fragment and possibly return whole packet */ 886 memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE_NO_UDP, len); 887 if (!done) 888 return NULL; 889 890 localip->ip_len = htons(total_len); 891 *lenp = total_len + IP_HDR_SIZE_NO_UDP; 892 return localip; 893 } 894 895 static inline IP_t *NetDefragment(IP_t *ip, int *lenp) 896 { 897 u16 ip_off = ntohs(ip->ip_off); 898 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) 899 return ip; /* not a fragment */ 900 return __NetDefragment(ip, lenp); 901 } 902 903 #else /* !CONFIG_IP_DEFRAG */ 904 905 static inline IP_t *NetDefragment(IP_t *ip, int *lenp) 906 { 907 u16 ip_off = ntohs(ip->ip_off); 908 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) 909 return ip; /* not a fragment */ 910 return NULL; 911 } 912 #endif 913 914 /** 915 * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently 916 * drop others. 917 * 918 * @parma ip IP packet containing the ICMP 919 */ 920 static void receive_icmp(IP_t *ip, int len, IPaddr_t src_ip, Ethernet_t *et) 921 { 922 ICMP_t *icmph = (ICMP_t *)&ip->udp_src; 923 924 switch (icmph->type) { 925 case ICMP_REDIRECT: 926 if (icmph->code != ICMP_REDIR_HOST) 927 return; 928 printf(" ICMP Host Redirect to %pI4 ", 929 &icmph->un.gateway); 930 break; 931 #if defined(CONFIG_CMD_PING) 932 case ICMP_ECHO_REPLY: 933 /* 934 * IP header OK. Pass the packet to the 935 * current handler. 936 */ 937 /* 938 * XXX point to ip packet - should this use 939 * packet_icmp_handler? 940 */ 941 (*packetHandler)((uchar *)ip, 0, src_ip, 0, 0); 942 break; 943 case ICMP_ECHO_REQUEST: 944 debug("Got ICMP ECHO REQUEST, return %d bytes\n", 945 ETHER_HDR_SIZE + len); 946 947 memcpy(&et->et_dest[0], &et->et_src[0], 6); 948 memcpy(&et->et_src[0], NetOurEther, 6); 949 950 ip->ip_sum = 0; 951 ip->ip_off = 0; 952 NetCopyIP((void *)&ip->ip_dst, &ip->ip_src); 953 NetCopyIP((void *)&ip->ip_src, &NetOurIP); 954 ip->ip_sum = ~NetCksum((uchar *)ip, 955 IP_HDR_SIZE_NO_UDP >> 1); 956 957 icmph->type = ICMP_ECHO_REPLY; 958 icmph->checksum = 0; 959 icmph->checksum = ~NetCksum((uchar *)icmph, 960 (len - IP_HDR_SIZE_NO_UDP) >> 1); 961 (void) eth_send((uchar *)et, 962 ETHER_HDR_SIZE + len); 963 break; 964 #endif 965 default: 966 #ifdef CONFIG_CMD_TFTPPUT 967 if (packet_icmp_handler) 968 packet_icmp_handler(icmph->type, icmph->code, 969 ntohs(ip->udp_dst), src_ip, ntohs(ip->udp_src), 970 icmph->un.data, ntohs(ip->udp_len)); 971 #endif 972 break; 973 } 974 } 975 976 void 977 NetReceive(uchar *inpkt, int len) 978 { 979 Ethernet_t *et; 980 IP_t *ip; 981 #ifdef CONFIG_CMD_RARP 982 ARP_t *arp; 983 #endif 984 IPaddr_t tmp; 985 IPaddr_t src_ip; 986 int x; 987 #if defined(CONFIG_CMD_CDP) 988 int iscdp; 989 #endif 990 ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid; 991 992 debug("packet received\n"); 993 994 NetRxPacket = inpkt; 995 NetRxPacketLen = len; 996 et = (Ethernet_t *)inpkt; 997 998 /* too small packet? */ 999 if (len < ETHER_HDR_SIZE) 1000 return; 1001 1002 #ifdef CONFIG_API 1003 if (push_packet) { 1004 (*push_packet)(inpkt, len); 1005 return; 1006 } 1007 #endif 1008 1009 #if defined(CONFIG_CMD_CDP) 1010 /* keep track if packet is CDP */ 1011 iscdp = is_cdp_packet(et->et_dest); 1012 #endif 1013 1014 myvlanid = ntohs(NetOurVLAN); 1015 if (myvlanid == (ushort)-1) 1016 myvlanid = VLAN_NONE; 1017 mynvlanid = ntohs(NetOurNativeVLAN); 1018 if (mynvlanid == (ushort)-1) 1019 mynvlanid = VLAN_NONE; 1020 1021 x = ntohs(et->et_protlen); 1022 1023 debug("packet received\n"); 1024 1025 if (x < 1514) { 1026 /* 1027 * Got a 802 packet. Check the other protocol field. 1028 */ 1029 x = ntohs(et->et_prot); 1030 1031 ip = (IP_t *)(inpkt + E802_HDR_SIZE); 1032 len -= E802_HDR_SIZE; 1033 1034 } else if (x != PROT_VLAN) { /* normal packet */ 1035 ip = (IP_t *)(inpkt + ETHER_HDR_SIZE); 1036 len -= ETHER_HDR_SIZE; 1037 1038 } else { /* VLAN packet */ 1039 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)et; 1040 1041 debug("VLAN packet received\n"); 1042 1043 /* too small packet? */ 1044 if (len < VLAN_ETHER_HDR_SIZE) 1045 return; 1046 1047 /* if no VLAN active */ 1048 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE 1049 #if defined(CONFIG_CMD_CDP) 1050 && iscdp == 0 1051 #endif 1052 ) 1053 return; 1054 1055 cti = ntohs(vet->vet_tag); 1056 vlanid = cti & VLAN_IDMASK; 1057 x = ntohs(vet->vet_type); 1058 1059 ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE); 1060 len -= VLAN_ETHER_HDR_SIZE; 1061 } 1062 1063 debug("Receive from protocol 0x%x\n", x); 1064 1065 #if defined(CONFIG_CMD_CDP) 1066 if (iscdp) { 1067 CDPHandler((uchar *)ip, len); 1068 return; 1069 } 1070 #endif 1071 1072 if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) { 1073 if (vlanid == VLAN_NONE) 1074 vlanid = (mynvlanid & VLAN_IDMASK); 1075 /* not matched? */ 1076 if (vlanid != (myvlanid & VLAN_IDMASK)) 1077 return; 1078 } 1079 1080 switch (x) { 1081 1082 case PROT_ARP: 1083 ArpReceive(et, ip, len); 1084 break; 1085 1086 #ifdef CONFIG_CMD_RARP 1087 case PROT_RARP: 1088 debug("Got RARP\n"); 1089 arp = (ARP_t *)ip; 1090 if (len < ARP_HDR_SIZE) { 1091 printf("bad length %d < %d\n", len, ARP_HDR_SIZE); 1092 return; 1093 } 1094 1095 if ((ntohs(arp->ar_op) != RARPOP_REPLY) || 1096 (ntohs(arp->ar_hrd) != ARP_ETHER) || 1097 (ntohs(arp->ar_pro) != PROT_IP) || 1098 (arp->ar_hln != 6) || (arp->ar_pln != 4)) { 1099 1100 puts("invalid RARP header\n"); 1101 } else { 1102 NetCopyIP(&NetOurIP, &arp->ar_data[16]); 1103 if (NetServerIP == 0) 1104 NetCopyIP(&NetServerIP, &arp->ar_data[6]); 1105 memcpy(NetServerEther, &arp->ar_data[0], 6); 1106 1107 (*packetHandler)(0, 0, 0, 0, 0); 1108 } 1109 break; 1110 #endif 1111 case PROT_IP: 1112 debug("Got IP\n"); 1113 /* Before we start poking the header, make sure it is there */ 1114 if (len < IP_HDR_SIZE) { 1115 debug("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE); 1116 return; 1117 } 1118 /* Check the packet length */ 1119 if (len < ntohs(ip->ip_len)) { 1120 printf("len bad %d < %d\n", len, ntohs(ip->ip_len)); 1121 return; 1122 } 1123 len = ntohs(ip->ip_len); 1124 debug("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff); 1125 1126 /* Can't deal with anything except IPv4 */ 1127 if ((ip->ip_hl_v & 0xf0) != 0x40) 1128 return; 1129 /* Can't deal with IP options (headers != 20 bytes) */ 1130 if ((ip->ip_hl_v & 0x0f) > 0x05) 1131 return; 1132 /* Check the Checksum of the header */ 1133 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) { 1134 puts("checksum bad\n"); 1135 return; 1136 } 1137 /* If it is not for us, ignore it */ 1138 tmp = NetReadIP(&ip->ip_dst); 1139 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) { 1140 #ifdef CONFIG_MCAST_TFTP 1141 if (Mcast_addr != tmp) 1142 #endif 1143 return; 1144 } 1145 /* Read source IP address for later use */ 1146 src_ip = NetReadIP(&ip->ip_src); 1147 /* 1148 * The function returns the unchanged packet if it's not 1149 * a fragment, and either the complete packet or NULL if 1150 * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL) 1151 */ 1152 ip = NetDefragment(ip, &len); 1153 if (!ip) 1154 return; 1155 /* 1156 * watch for ICMP host redirects 1157 * 1158 * There is no real handler code (yet). We just watch 1159 * for ICMP host redirect messages. In case anybody 1160 * sees these messages: please contact me 1161 * (wd@denx.de), or - even better - send me the 1162 * necessary fixes :-) 1163 * 1164 * Note: in all cases where I have seen this so far 1165 * it was a problem with the router configuration, 1166 * for instance when a router was configured in the 1167 * BOOTP reply, but the TFTP server was on the same 1168 * subnet. So this is probably a warning that your 1169 * configuration might be wrong. But I'm not really 1170 * sure if there aren't any other situations. 1171 * 1172 * Simon Glass <sjg@chromium.org>: We get an ICMP when 1173 * we send a tftp packet to a dead connection, or when 1174 * there is no server at the other end. 1175 */ 1176 if (ip->ip_p == IPPROTO_ICMP) { 1177 receive_icmp(ip, len, src_ip, et); 1178 return; 1179 } else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */ 1180 return; 1181 } 1182 1183 #ifdef CONFIG_UDP_CHECKSUM 1184 if (ip->udp_xsum != 0) { 1185 ulong xsum; 1186 ushort *sumptr; 1187 ushort sumlen; 1188 1189 xsum = ip->ip_p; 1190 xsum += (ntohs(ip->udp_len)); 1191 xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff; 1192 xsum += (ntohl(ip->ip_src) >> 0) & 0x0000ffff; 1193 xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff; 1194 xsum += (ntohl(ip->ip_dst) >> 0) & 0x0000ffff; 1195 1196 sumlen = ntohs(ip->udp_len); 1197 sumptr = (ushort *) &(ip->udp_src); 1198 1199 while (sumlen > 1) { 1200 ushort sumdata; 1201 1202 sumdata = *sumptr++; 1203 xsum += ntohs(sumdata); 1204 sumlen -= 2; 1205 } 1206 if (sumlen > 0) { 1207 ushort sumdata; 1208 1209 sumdata = *(unsigned char *) sumptr; 1210 sumdata = (sumdata << 8) & 0xff00; 1211 xsum += sumdata; 1212 } 1213 while ((xsum >> 16) != 0) { 1214 xsum = (xsum & 0x0000ffff) + 1215 ((xsum >> 16) & 0x0000ffff); 1216 } 1217 if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) { 1218 printf(" UDP wrong checksum %08lx %08x\n", 1219 xsum, ntohs(ip->udp_xsum)); 1220 return; 1221 } 1222 } 1223 #endif 1224 1225 1226 #ifdef CONFIG_NETCONSOLE 1227 nc_input_packet((uchar *)ip + IP_HDR_SIZE, 1228 ntohs(ip->udp_dst), 1229 ntohs(ip->udp_src), 1230 ntohs(ip->udp_len) - 8); 1231 #endif 1232 /* 1233 * IP header OK. Pass the packet to the current handler. 1234 */ 1235 (*packetHandler)((uchar *)ip + IP_HDR_SIZE, 1236 ntohs(ip->udp_dst), 1237 src_ip, 1238 ntohs(ip->udp_src), 1239 ntohs(ip->udp_len) - 8); 1240 break; 1241 } 1242 } 1243 1244 1245 /**********************************************************************/ 1246 1247 static int net_check_prereq(enum proto_t protocol) 1248 { 1249 switch (protocol) { 1250 /* Fall through */ 1251 #if defined(CONFIG_CMD_PING) 1252 case PING: 1253 if (NetPingIP == 0) { 1254 puts("*** ERROR: ping address not given\n"); 1255 return 1; 1256 } 1257 goto common; 1258 #endif 1259 #if defined(CONFIG_CMD_SNTP) 1260 case SNTP: 1261 if (NetNtpServerIP == 0) { 1262 puts("*** ERROR: NTP server address not given\n"); 1263 return 1; 1264 } 1265 goto common; 1266 #endif 1267 #if defined(CONFIG_CMD_DNS) 1268 case DNS: 1269 if (NetOurDNSIP == 0) { 1270 puts("*** ERROR: DNS server address not given\n"); 1271 return 1; 1272 } 1273 goto common; 1274 #endif 1275 #if defined(CONFIG_CMD_NFS) 1276 case NFS: 1277 #endif 1278 case TFTPGET: 1279 case TFTPPUT: 1280 if (NetServerIP == 0) { 1281 puts("*** ERROR: `serverip' not set\n"); 1282 return 1; 1283 } 1284 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \ 1285 defined(CONFIG_CMD_DNS) 1286 common: 1287 #endif 1288 /* Fall through */ 1289 1290 case NETCONS: 1291 case TFTPSRV: 1292 if (NetOurIP == 0) { 1293 puts("*** ERROR: `ipaddr' not set\n"); 1294 return 1; 1295 } 1296 /* Fall through */ 1297 1298 #ifdef CONFIG_CMD_RARP 1299 case RARP: 1300 #endif 1301 case BOOTP: 1302 case CDP: 1303 case DHCP: 1304 if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) { 1305 int num = eth_get_dev_index(); 1306 1307 switch (num) { 1308 case -1: 1309 puts("*** ERROR: No ethernet found.\n"); 1310 return 1; 1311 case 0: 1312 puts("*** ERROR: `ethaddr' not set\n"); 1313 break; 1314 default: 1315 printf("*** ERROR: `eth%daddr' not set\n", 1316 num); 1317 break; 1318 } 1319 1320 NetStartAgain(); 1321 return 2; 1322 } 1323 /* Fall through */ 1324 default: 1325 return 0; 1326 } 1327 return 0; /* OK */ 1328 } 1329 /**********************************************************************/ 1330 1331 int 1332 NetCksumOk(uchar *ptr, int len) 1333 { 1334 return !((NetCksum(ptr, len) + 1) & 0xfffe); 1335 } 1336 1337 1338 unsigned 1339 NetCksum(uchar *ptr, int len) 1340 { 1341 ulong xsum; 1342 ushort *p = (ushort *)ptr; 1343 1344 xsum = 0; 1345 while (len-- > 0) 1346 xsum += *p++; 1347 xsum = (xsum & 0xffff) + (xsum >> 16); 1348 xsum = (xsum & 0xffff) + (xsum >> 16); 1349 return xsum & 0xffff; 1350 } 1351 1352 int 1353 NetEthHdrSize(void) 1354 { 1355 ushort myvlanid; 1356 1357 myvlanid = ntohs(NetOurVLAN); 1358 if (myvlanid == (ushort)-1) 1359 myvlanid = VLAN_NONE; 1360 1361 return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : 1362 VLAN_ETHER_HDR_SIZE; 1363 } 1364 1365 int 1366 NetSetEther(uchar *xet, uchar * addr, uint prot) 1367 { 1368 Ethernet_t *et = (Ethernet_t *)xet; 1369 ushort myvlanid; 1370 1371 myvlanid = ntohs(NetOurVLAN); 1372 if (myvlanid == (ushort)-1) 1373 myvlanid = VLAN_NONE; 1374 1375 memcpy(et->et_dest, addr, 6); 1376 memcpy(et->et_src, NetOurEther, 6); 1377 if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) { 1378 et->et_protlen = htons(prot); 1379 return ETHER_HDR_SIZE; 1380 } else { 1381 VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)xet; 1382 1383 vet->vet_vlan_type = htons(PROT_VLAN); 1384 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK)); 1385 vet->vet_type = htons(prot); 1386 return VLAN_ETHER_HDR_SIZE; 1387 } 1388 } 1389 1390 void 1391 NetSetIP(uchar *xip, IPaddr_t dest, int dport, int sport, int len) 1392 { 1393 IP_t *ip = (IP_t *)xip; 1394 1395 /* 1396 * If the data is an odd number of bytes, zero the 1397 * byte after the last byte so that the checksum 1398 * will work. 1399 */ 1400 if (len & 1) 1401 xip[IP_HDR_SIZE + len] = 0; 1402 1403 /* 1404 * Construct an IP and UDP header. 1405 * (need to set no fragment bit - XXX) 1406 */ 1407 /* IP_HDR_SIZE / 4 (not including UDP) */ 1408 ip->ip_hl_v = 0x45; 1409 ip->ip_tos = 0; 1410 ip->ip_len = htons(IP_HDR_SIZE + len); 1411 ip->ip_id = htons(NetIPID++); 1412 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ 1413 ip->ip_ttl = 255; 1414 ip->ip_p = 17; /* UDP */ 1415 ip->ip_sum = 0; 1416 /* already in network byte order */ 1417 NetCopyIP((void *)&ip->ip_src, &NetOurIP); 1418 /* - "" - */ 1419 NetCopyIP((void *)&ip->ip_dst, &dest); 1420 ip->udp_src = htons(sport); 1421 ip->udp_dst = htons(dport); 1422 ip->udp_len = htons(8 + len); 1423 ip->udp_xsum = 0; 1424 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2); 1425 } 1426 1427 void copy_filename(char *dst, const char *src, int size) 1428 { 1429 if (*src && (*src == '"')) { 1430 ++src; 1431 --size; 1432 } 1433 1434 while ((--size > 0) && *src && (*src != '"')) 1435 *dst++ = *src++; 1436 *dst = '\0'; 1437 } 1438 1439 #if defined(CONFIG_CMD_NFS) || \ 1440 defined(CONFIG_CMD_SNTP) || \ 1441 defined(CONFIG_CMD_DNS) 1442 /* 1443 * make port a little random (1024-17407) 1444 * This keeps the math somewhat trivial to compute, and seems to work with 1445 * all supported protocols/clients/servers 1446 */ 1447 unsigned int random_port(void) 1448 { 1449 return 1024 + (get_timer(0) % 0x4000); 1450 } 1451 #endif 1452 1453 void ip_to_string(IPaddr_t x, char *s) 1454 { 1455 x = ntohl(x); 1456 sprintf(s, "%d.%d.%d.%d", 1457 (int) ((x >> 24) & 0xff), 1458 (int) ((x >> 16) & 0xff), 1459 (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff) 1460 ); 1461 } 1462 1463 void VLAN_to_string(ushort x, char *s) 1464 { 1465 x = ntohs(x); 1466 1467 if (x == (ushort)-1) 1468 x = VLAN_NONE; 1469 1470 if (x == VLAN_NONE) 1471 strcpy(s, "none"); 1472 else 1473 sprintf(s, "%d", x & VLAN_IDMASK); 1474 } 1475 1476 ushort string_to_VLAN(const char *s) 1477 { 1478 ushort id; 1479 1480 if (s == NULL) 1481 return htons(VLAN_NONE); 1482 1483 if (*s < '0' || *s > '9') 1484 id = VLAN_NONE; 1485 else 1486 id = (ushort)simple_strtoul(s, NULL, 10); 1487 1488 return htons(id); 1489 } 1490 1491 ushort getenv_VLAN(char *var) 1492 { 1493 return string_to_VLAN(getenv(var)); 1494 } 1495