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