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