1 /* 2 * Copied from Linux Monitor (LiMon) - Networking. 3 * 4 * Copyright 1994 - 2000 Neil Russell. 5 * (See License) 6 * Copyright 2000 Roland Borde 7 * Copyright 2000 Paolo Scaffardi 8 * Copyright 2000-2002 Wolfgang Denk, wd@denx.de 9 * SPDX-License-Identifier: GPL-2.0 10 */ 11 12 /* 13 * General Desription: 14 * 15 * The user interface supports commands for BOOTP, RARP, and TFTP. 16 * Also, we support ARP internally. Depending on available data, 17 * these interact as follows: 18 * 19 * BOOTP: 20 * 21 * Prerequisites: - own ethernet address 22 * We want: - own IP address 23 * - TFTP server IP address 24 * - name of bootfile 25 * Next step: ARP 26 * 27 * LINK_LOCAL: 28 * 29 * Prerequisites: - own ethernet address 30 * We want: - own IP address 31 * Next step: ARP 32 * 33 * RARP: 34 * 35 * Prerequisites: - own ethernet address 36 * We want: - own IP address 37 * - TFTP server IP address 38 * Next step: ARP 39 * 40 * ARP: 41 * 42 * Prerequisites: - own ethernet address 43 * - own IP address 44 * - TFTP server IP address 45 * We want: - TFTP server ethernet address 46 * Next step: TFTP 47 * 48 * DHCP: 49 * 50 * Prerequisites: - own ethernet address 51 * We want: - IP, Netmask, ServerIP, Gateway IP 52 * - bootfilename, lease time 53 * Next step: - TFTP 54 * 55 * TFTP: 56 * 57 * Prerequisites: - own ethernet address 58 * - own IP address 59 * - TFTP server IP address 60 * - TFTP server ethernet address 61 * - name of bootfile (if unknown, we use a default name 62 * derived from our own IP address) 63 * We want: - load the boot file 64 * Next step: none 65 * 66 * NFS: 67 * 68 * Prerequisites: - own ethernet address 69 * - own IP address 70 * - name of bootfile (if unknown, we use a default name 71 * derived from our own IP address) 72 * We want: - load the boot file 73 * Next step: none 74 * 75 * SNTP: 76 * 77 * Prerequisites: - own ethernet address 78 * - own IP address 79 * We want: - network time 80 * Next step: none 81 */ 82 83 84 #include <common.h> 85 #include <command.h> 86 #include <environment.h> 87 #include <errno.h> 88 #include <net.h> 89 #if defined(CONFIG_STATUS_LED) 90 #include <miiphy.h> 91 #include <status_led.h> 92 #endif 93 #include <watchdog.h> 94 #include <linux/compiler.h> 95 #include "arp.h" 96 #include "bootp.h" 97 #include "cdp.h" 98 #if defined(CONFIG_CMD_DNS) 99 #include "dns.h" 100 #endif 101 #include "link_local.h" 102 #include "nfs.h" 103 #include "ping.h" 104 #include "rarp.h" 105 #if defined(CONFIG_CMD_SNTP) 106 #include "sntp.h" 107 #endif 108 #include "tftp.h" 109 110 DECLARE_GLOBAL_DATA_PTR; 111 112 /** BOOTP EXTENTIONS **/ 113 114 /* Our subnet mask (0=unknown) */ 115 struct in_addr net_netmask; 116 /* Our gateways IP address */ 117 struct in_addr net_gateway; 118 /* Our DNS IP address */ 119 struct in_addr net_dns_server; 120 #if defined(CONFIG_BOOTP_DNS2) 121 /* Our 2nd DNS IP address */ 122 struct in_addr net_dns_server2; 123 #endif 124 125 #ifdef CONFIG_MCAST_TFTP /* Multicast TFTP */ 126 struct in_addr net_mcast_addr; 127 #endif 128 129 /** END OF BOOTP EXTENTIONS **/ 130 131 /* Our ethernet address */ 132 u8 net_ethaddr[6]; 133 /* Boot server enet address */ 134 u8 net_server_ethaddr[6]; 135 /* Our IP addr (0 = unknown) */ 136 struct in_addr net_ip; 137 /* Server IP addr (0 = unknown) */ 138 struct in_addr net_server_ip; 139 /* Current receive packet */ 140 uchar *NetRxPacket; 141 /* Current rx packet length */ 142 int NetRxPacketLen; 143 /* IP packet ID */ 144 unsigned NetIPID; 145 /* Ethernet bcast address */ 146 const u8 net_bcast_ethaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 147 const u8 net_null_ethaddr[6]; 148 #ifdef CONFIG_API 149 void (*push_packet)(void *, int len) = 0; 150 #endif 151 /* Network loop state */ 152 enum net_loop_state net_state; 153 /* Tried all network devices */ 154 int NetRestartWrap; 155 /* Network loop restarted */ 156 static int NetRestarted; 157 /* At least one device configured */ 158 static int NetDevExists; 159 160 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */ 161 /* default is without VLAN */ 162 ushort NetOurVLAN = 0xFFFF; 163 /* ditto */ 164 ushort NetOurNativeVLAN = 0xFFFF; 165 166 /* Boot File name */ 167 char net_boot_file_name[128]; 168 /* The actual transferred size of the bootfile (in bytes) */ 169 u32 net_boot_file_size; 170 /* Boot file size in blocks as reported by the DHCP server */ 171 u32 net_boot_file_expected_size_in_blocks; 172 173 #if defined(CONFIG_CMD_SNTP) 174 /* NTP server IP address */ 175 struct in_addr net_ntp_server; 176 /* offset time from UTC */ 177 int NetTimeOffset; 178 #endif 179 180 static uchar PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN]; 181 #ifdef CONFIG_DM_ETH 182 /* Receive packets */ 183 uchar *net_rx_packets[PKTBUFSRX]; 184 #else 185 /* Receive packet */ 186 uchar *NetRxPackets[PKTBUFSRX]; 187 #endif 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 int __maybe_unused net_busy_flag; 210 211 /**********************************************************************/ 212 213 static int on_bootfile(const char *name, const char *value, enum env_op op, 214 int flags) 215 { 216 switch (op) { 217 case env_op_create: 218 case env_op_overwrite: 219 copy_filename(net_boot_file_name, value, 220 sizeof(net_boot_file_name)); 221 break; 222 default: 223 break; 224 } 225 226 return 0; 227 } 228 U_BOOT_ENV_CALLBACK(bootfile, on_bootfile); 229 230 /* 231 * Check if autoload is enabled. If so, use either NFS or TFTP to download 232 * the boot file. 233 */ 234 void net_auto_load(void) 235 { 236 #if defined(CONFIG_CMD_NFS) 237 const char *s = getenv("autoload"); 238 239 if (s != NULL && strcmp(s, "NFS") == 0) { 240 /* 241 * Use NFS to load the bootfile. 242 */ 243 NfsStart(); 244 return; 245 } 246 #endif 247 if (getenv_yesno("autoload") == 0) { 248 /* 249 * Just use BOOTP/RARP to configure system; 250 * Do not use TFTP to load the bootfile. 251 */ 252 net_set_state(NETLOOP_SUCCESS); 253 return; 254 } 255 TftpStart(TFTPGET); 256 } 257 258 static void NetInitLoop(void) 259 { 260 static int env_changed_id; 261 int env_id = get_env_id(); 262 263 /* update only when the environment has changed */ 264 if (env_changed_id != env_id) { 265 net_ip = getenv_ip("ipaddr"); 266 net_gateway = getenv_ip("gatewayip"); 267 net_netmask = getenv_ip("netmask"); 268 net_server_ip = getenv_ip("serverip"); 269 NetOurNativeVLAN = getenv_VLAN("nvlan"); 270 NetOurVLAN = getenv_VLAN("vlan"); 271 #if defined(CONFIG_CMD_DNS) 272 net_dns_server = getenv_ip("dnsip"); 273 #endif 274 env_changed_id = env_id; 275 } 276 if (eth_get_dev()) 277 memcpy(net_ethaddr, eth_get_ethaddr(), 6); 278 279 return; 280 } 281 282 static void net_clear_handlers(void) 283 { 284 net_set_udp_handler(NULL); 285 net_set_arp_handler(NULL); 286 NetSetTimeout(0, NULL); 287 } 288 289 static void net_cleanup_loop(void) 290 { 291 net_clear_handlers(); 292 } 293 294 void net_init(void) 295 { 296 static int first_call = 1; 297 298 if (first_call) { 299 /* 300 * Setup packet buffers, aligned correctly. 301 */ 302 int i; 303 304 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1); 305 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN; 306 #ifdef CONFIG_DM_ETH 307 for (i = 0; i < PKTBUFSRX; i++) { 308 net_rx_packets[i] = NetTxPacket + (i + 1) * 309 PKTSIZE_ALIGN; 310 } 311 #else 312 for (i = 0; i < PKTBUFSRX; i++) 313 NetRxPackets[i] = NetTxPacket + (i + 1) * PKTSIZE_ALIGN; 314 #endif 315 ArpInit(); 316 net_clear_handlers(); 317 318 /* Only need to setup buffer pointers once. */ 319 first_call = 0; 320 } 321 322 NetInitLoop(); 323 } 324 325 /**********************************************************************/ 326 /* 327 * Main network processing loop. 328 */ 329 330 int NetLoop(enum proto_t protocol) 331 { 332 int ret = -EINVAL; 333 334 NetRestarted = 0; 335 NetDevExists = 0; 336 NetTryCount = 1; 337 debug_cond(DEBUG_INT_STATE, "--- NetLoop Entry\n"); 338 339 bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start"); 340 net_init(); 341 if (eth_is_on_demand_init() || protocol != NETCONS) { 342 eth_halt(); 343 eth_set_current(); 344 ret = eth_init(); 345 if (ret < 0) { 346 eth_halt(); 347 return ret; 348 } 349 } else 350 eth_init_state_only(); 351 352 restart: 353 #ifdef CONFIG_USB_KEYBOARD 354 net_busy_flag = 0; 355 #endif 356 net_set_state(NETLOOP_CONTINUE); 357 358 /* 359 * Start the ball rolling with the given start function. From 360 * here on, this code is a state machine driven by received 361 * packets and timer events. 362 */ 363 debug_cond(DEBUG_INT_STATE, "--- NetLoop Init\n"); 364 NetInitLoop(); 365 366 switch (net_check_prereq(protocol)) { 367 case 1: 368 /* network not configured */ 369 eth_halt(); 370 return -ENODEV; 371 372 case 2: 373 /* network device not configured */ 374 break; 375 376 case 0: 377 NetDevExists = 1; 378 net_boot_file_size = 0; 379 switch (protocol) { 380 case TFTPGET: 381 #ifdef CONFIG_CMD_TFTPPUT 382 case TFTPPUT: 383 #endif 384 /* always use ARP to get server ethernet address */ 385 TftpStart(protocol); 386 break; 387 #ifdef CONFIG_CMD_TFTPSRV 388 case TFTPSRV: 389 TftpStartServer(); 390 break; 391 #endif 392 #if defined(CONFIG_CMD_DHCP) 393 case DHCP: 394 BootpReset(); 395 net_ip.s_addr = 0; 396 DhcpRequest(); /* Basically same as BOOTP */ 397 break; 398 #endif 399 400 case BOOTP: 401 BootpReset(); 402 net_ip.s_addr = 0; 403 BootpRequest(); 404 break; 405 406 #if defined(CONFIG_CMD_RARP) 407 case RARP: 408 RarpTry = 0; 409 net_ip.s_addr = 0; 410 RarpRequest(); 411 break; 412 #endif 413 #if defined(CONFIG_CMD_PING) 414 case PING: 415 ping_start(); 416 break; 417 #endif 418 #if defined(CONFIG_CMD_NFS) 419 case NFS: 420 NfsStart(); 421 break; 422 #endif 423 #if defined(CONFIG_CMD_CDP) 424 case CDP: 425 CDPStart(); 426 break; 427 #endif 428 #if defined (CONFIG_NETCONSOLE) && !(CONFIG_SPL_BUILD) 429 case NETCONS: 430 NcStart(); 431 break; 432 #endif 433 #if defined(CONFIG_CMD_SNTP) 434 case SNTP: 435 SntpStart(); 436 break; 437 #endif 438 #if defined(CONFIG_CMD_DNS) 439 case DNS: 440 DnsStart(); 441 break; 442 #endif 443 #if defined(CONFIG_CMD_LINK_LOCAL) 444 case LINKLOCAL: 445 link_local_start(); 446 break; 447 #endif 448 default: 449 break; 450 } 451 452 break; 453 } 454 455 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 456 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ 457 defined(CONFIG_STATUS_LED) && \ 458 defined(STATUS_LED_RED) 459 /* 460 * Echo the inverted link state to the fault LED. 461 */ 462 if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) 463 status_led_set(STATUS_LED_RED, STATUS_LED_OFF); 464 else 465 status_led_set(STATUS_LED_RED, STATUS_LED_ON); 466 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 467 #endif /* CONFIG_MII, ... */ 468 #ifdef CONFIG_USB_KEYBOARD 469 net_busy_flag = 1; 470 #endif 471 472 /* 473 * Main packet reception loop. Loop receiving packets until 474 * someone sets `net_state' to a state that terminates. 475 */ 476 for (;;) { 477 WATCHDOG_RESET(); 478 #ifdef CONFIG_SHOW_ACTIVITY 479 show_activity(1); 480 #endif 481 /* 482 * Check the ethernet for a new packet. The ethernet 483 * receive routine will process it. 484 * Most drivers return the most recent packet size, but not 485 * errors that may have happened. 486 */ 487 eth_rx(); 488 489 /* 490 * Abort if ctrl-c was pressed. 491 */ 492 if (ctrlc()) { 493 /* cancel any ARP that may not have completed */ 494 net_arp_wait_packet_ip.s_addr = 0; 495 496 net_cleanup_loop(); 497 eth_halt(); 498 /* Invalidate the last protocol */ 499 eth_set_last_protocol(BOOTP); 500 501 puts("\nAbort\n"); 502 /* include a debug print as well incase the debug 503 messages are directed to stderr */ 504 debug_cond(DEBUG_INT_STATE, "--- NetLoop Abort!\n"); 505 goto done; 506 } 507 508 ArpTimeoutCheck(); 509 510 /* 511 * Check for a timeout, and run the timeout handler 512 * if we have one. 513 */ 514 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) { 515 thand_f *x; 516 517 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 518 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ 519 defined(CONFIG_STATUS_LED) && \ 520 defined(STATUS_LED_RED) 521 /* 522 * Echo the inverted link state to the fault LED. 523 */ 524 if (miiphy_link(eth_get_dev()->name, 525 CONFIG_SYS_FAULT_MII_ADDR)) { 526 status_led_set(STATUS_LED_RED, STATUS_LED_OFF); 527 } else { 528 status_led_set(STATUS_LED_RED, STATUS_LED_ON); 529 } 530 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 531 #endif /* CONFIG_MII, ... */ 532 debug_cond(DEBUG_INT_STATE, "--- NetLoop timeout\n"); 533 x = timeHandler; 534 timeHandler = (thand_f *)0; 535 (*x)(); 536 } 537 538 if (net_state == NETLOOP_FAIL) 539 ret = NetStartAgain(); 540 541 switch (net_state) { 542 543 case NETLOOP_RESTART: 544 NetRestarted = 1; 545 goto restart; 546 547 case NETLOOP_SUCCESS: 548 net_cleanup_loop(); 549 if (net_boot_file_size > 0) { 550 printf("Bytes transferred = %d (%x hex)\n", 551 net_boot_file_size, net_boot_file_size); 552 setenv_hex("filesize", net_boot_file_size); 553 setenv_hex("fileaddr", load_addr); 554 } 555 if (protocol != NETCONS) 556 eth_halt(); 557 else 558 eth_halt_state_only(); 559 560 eth_set_last_protocol(protocol); 561 562 ret = net_boot_file_size; 563 debug_cond(DEBUG_INT_STATE, "--- NetLoop Success!\n"); 564 goto done; 565 566 case NETLOOP_FAIL: 567 net_cleanup_loop(); 568 /* Invalidate the last protocol */ 569 eth_set_last_protocol(BOOTP); 570 debug_cond(DEBUG_INT_STATE, "--- NetLoop Fail!\n"); 571 goto done; 572 573 case NETLOOP_CONTINUE: 574 continue; 575 } 576 } 577 578 done: 579 #ifdef CONFIG_USB_KEYBOARD 580 net_busy_flag = 0; 581 #endif 582 #ifdef CONFIG_CMD_TFTPPUT 583 /* Clear out the handlers */ 584 net_set_udp_handler(NULL); 585 net_set_icmp_handler(NULL); 586 #endif 587 return ret; 588 } 589 590 /**********************************************************************/ 591 592 static void 593 startAgainTimeout(void) 594 { 595 net_set_state(NETLOOP_RESTART); 596 } 597 598 int NetStartAgain(void) 599 { 600 char *nretry; 601 int retry_forever = 0; 602 unsigned long retrycnt = 0; 603 int ret; 604 605 nretry = getenv("netretry"); 606 if (nretry) { 607 if (!strcmp(nretry, "yes")) 608 retry_forever = 1; 609 else if (!strcmp(nretry, "no")) 610 retrycnt = 0; 611 else if (!strcmp(nretry, "once")) 612 retrycnt = 1; 613 else 614 retrycnt = simple_strtoul(nretry, NULL, 0); 615 } else { 616 retrycnt = 0; 617 retry_forever = 0; 618 } 619 620 if ((!retry_forever) && (NetTryCount >= retrycnt)) { 621 eth_halt(); 622 net_set_state(NETLOOP_FAIL); 623 /* 624 * We don't provide a way for the protocol to return an error, 625 * but this is almost always the reason. 626 */ 627 return -ETIMEDOUT; 628 } 629 630 NetTryCount++; 631 632 eth_halt(); 633 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER) 634 eth_try_another(!NetRestarted); 635 #endif 636 ret = eth_init(); 637 if (NetRestartWrap) { 638 NetRestartWrap = 0; 639 if (NetDevExists) { 640 NetSetTimeout(10000UL, startAgainTimeout); 641 net_set_udp_handler(NULL); 642 } else { 643 net_set_state(NETLOOP_FAIL); 644 } 645 } else { 646 net_set_state(NETLOOP_RESTART); 647 } 648 return ret; 649 } 650 651 /**********************************************************************/ 652 /* 653 * Miscelaneous bits. 654 */ 655 656 static void dummy_handler(uchar *pkt, unsigned dport, 657 struct in_addr sip, unsigned sport, 658 unsigned len) 659 { 660 } 661 662 rxhand_f *net_get_udp_handler(void) 663 { 664 return udp_packet_handler; 665 } 666 667 void net_set_udp_handler(rxhand_f *f) 668 { 669 debug_cond(DEBUG_INT_STATE, "--- NetLoop UDP handler set (%p)\n", f); 670 if (f == NULL) 671 udp_packet_handler = dummy_handler; 672 else 673 udp_packet_handler = f; 674 } 675 676 rxhand_f *net_get_arp_handler(void) 677 { 678 return arp_packet_handler; 679 } 680 681 void net_set_arp_handler(rxhand_f *f) 682 { 683 debug_cond(DEBUG_INT_STATE, "--- NetLoop ARP handler set (%p)\n", f); 684 if (f == NULL) 685 arp_packet_handler = dummy_handler; 686 else 687 arp_packet_handler = f; 688 } 689 690 #ifdef CONFIG_CMD_TFTPPUT 691 void net_set_icmp_handler(rxhand_icmp_f *f) 692 { 693 packet_icmp_handler = f; 694 } 695 #endif 696 697 void 698 NetSetTimeout(ulong iv, thand_f *f) 699 { 700 if (iv == 0) { 701 debug_cond(DEBUG_INT_STATE, 702 "--- NetLoop timeout handler cancelled\n"); 703 timeHandler = (thand_f *)0; 704 } else { 705 debug_cond(DEBUG_INT_STATE, 706 "--- NetLoop timeout handler set (%p)\n", f); 707 timeHandler = f; 708 timeStart = get_timer(0); 709 timeDelta = iv * CONFIG_SYS_HZ / 1000; 710 } 711 } 712 713 int NetSendUDPPacket(uchar *ether, struct in_addr dest, int dport, int sport, 714 int payload_len) 715 { 716 uchar *pkt; 717 int eth_hdr_size; 718 int pkt_hdr_size; 719 720 /* make sure the NetTxPacket is initialized (NetInit() was called) */ 721 assert(NetTxPacket != NULL); 722 if (NetTxPacket == NULL) 723 return -1; 724 725 /* convert to new style broadcast */ 726 if (dest.s_addr == 0) 727 dest.s_addr = 0xFFFFFFFF; 728 729 /* if broadcast, make the ether address a broadcast and don't do ARP */ 730 if (dest.s_addr == 0xFFFFFFFF) 731 ether = (uchar *)net_bcast_ethaddr; 732 733 pkt = (uchar *)NetTxPacket; 734 735 eth_hdr_size = NetSetEther(pkt, ether, PROT_IP); 736 pkt += eth_hdr_size; 737 net_set_udp_header(pkt, dest, dport, sport, payload_len); 738 pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE; 739 740 /* if MAC address was not discovered yet, do an ARP request */ 741 if (memcmp(ether, net_null_ethaddr, 6) == 0) { 742 debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest); 743 744 /* save the ip and eth addr for the packet to send after arp */ 745 net_arp_wait_packet_ip = dest; 746 NetArpWaitPacketMAC = ether; 747 748 /* size of the waiting packet */ 749 NetArpWaitTxPacketSize = pkt_hdr_size + payload_len; 750 751 /* and do the ARP request */ 752 NetArpWaitTry = 1; 753 NetArpWaitTimerStart = get_timer(0); 754 ArpRequest(); 755 return 1; /* waiting */ 756 } else { 757 debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n", 758 &dest, ether); 759 NetSendPacket(NetTxPacket, pkt_hdr_size + payload_len); 760 return 0; /* transmitted */ 761 } 762 } 763 764 #ifdef CONFIG_IP_DEFRAG 765 /* 766 * This function collects fragments in a single packet, according 767 * to the algorithm in RFC815. It returns NULL or the pointer to 768 * a complete packet, in static storage 769 */ 770 #ifndef CONFIG_NET_MAXDEFRAG 771 #define CONFIG_NET_MAXDEFRAG 16384 772 #endif 773 /* 774 * MAXDEFRAG, above, is chosen in the config file and is real data 775 * so we need to add the NFS overhead, which is more than TFTP. 776 * To use sizeof in the internal unnamed structures, we need a real 777 * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately). 778 * The compiler doesn't complain nor allocates the actual structure 779 */ 780 static struct rpc_t rpc_specimen; 781 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply)) 782 783 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE) 784 785 /* 786 * this is the packet being assembled, either data or frag control. 787 * Fragments go by 8 bytes, so this union must be 8 bytes long 788 */ 789 struct hole { 790 /* first_byte is address of this structure */ 791 u16 last_byte; /* last byte in this hole + 1 (begin of next hole) */ 792 u16 next_hole; /* index of next (in 8-b blocks), 0 == none */ 793 u16 prev_hole; /* index of prev, 0 == none */ 794 u16 unused; 795 }; 796 797 static struct ip_udp_hdr *__NetDefragment(struct ip_udp_hdr *ip, int *lenp) 798 { 799 static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN); 800 static u16 first_hole, total_len; 801 struct hole *payload, *thisfrag, *h, *newh; 802 struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff; 803 uchar *indata = (uchar *)ip; 804 int offset8, start, len, done = 0; 805 u16 ip_off = ntohs(ip->ip_off); 806 807 /* payload starts after IP header, this fragment is in there */ 808 payload = (struct hole *)(pkt_buff + IP_HDR_SIZE); 809 offset8 = (ip_off & IP_OFFS); 810 thisfrag = payload + offset8; 811 start = offset8 * 8; 812 len = ntohs(ip->ip_len) - IP_HDR_SIZE; 813 814 if (start + len > IP_MAXUDP) /* fragment extends too far */ 815 return NULL; 816 817 if (!total_len || localip->ip_id != ip->ip_id) { 818 /* new (or different) packet, reset structs */ 819 total_len = 0xffff; 820 payload[0].last_byte = ~0; 821 payload[0].next_hole = 0; 822 payload[0].prev_hole = 0; 823 first_hole = 0; 824 /* any IP header will work, copy the first we received */ 825 memcpy(localip, ip, IP_HDR_SIZE); 826 } 827 828 /* 829 * What follows is the reassembly algorithm. We use the payload 830 * array as a linked list of hole descriptors, as each hole starts 831 * at a multiple of 8 bytes. However, last byte can be whatever value, 832 * so it is represented as byte count, not as 8-byte blocks. 833 */ 834 835 h = payload + first_hole; 836 while (h->last_byte < start) { 837 if (!h->next_hole) { 838 /* no hole that far away */ 839 return NULL; 840 } 841 h = payload + h->next_hole; 842 } 843 844 /* last fragment may be 1..7 bytes, the "+7" forces acceptance */ 845 if (offset8 + ((len + 7) / 8) <= h - payload) { 846 /* no overlap with holes (dup fragment?) */ 847 return NULL; 848 } 849 850 if (!(ip_off & IP_FLAGS_MFRAG)) { 851 /* no more fragmentss: truncate this (last) hole */ 852 total_len = start + len; 853 h->last_byte = start + len; 854 } 855 856 /* 857 * There is some overlap: fix the hole list. This code doesn't 858 * deal with a fragment that overlaps with two different holes 859 * (thus being a superset of a previously-received fragment). 860 */ 861 862 if ((h >= thisfrag) && (h->last_byte <= start + len)) { 863 /* complete overlap with hole: remove hole */ 864 if (!h->prev_hole && !h->next_hole) { 865 /* last remaining hole */ 866 done = 1; 867 } else if (!h->prev_hole) { 868 /* first hole */ 869 first_hole = h->next_hole; 870 payload[h->next_hole].prev_hole = 0; 871 } else if (!h->next_hole) { 872 /* last hole */ 873 payload[h->prev_hole].next_hole = 0; 874 } else { 875 /* in the middle of the list */ 876 payload[h->next_hole].prev_hole = h->prev_hole; 877 payload[h->prev_hole].next_hole = h->next_hole; 878 } 879 880 } else if (h->last_byte <= start + len) { 881 /* overlaps with final part of the hole: shorten this hole */ 882 h->last_byte = start; 883 884 } else if (h >= thisfrag) { 885 /* overlaps with initial part of the hole: move this hole */ 886 newh = thisfrag + (len / 8); 887 *newh = *h; 888 h = newh; 889 if (h->next_hole) 890 payload[h->next_hole].prev_hole = (h - payload); 891 if (h->prev_hole) 892 payload[h->prev_hole].next_hole = (h - payload); 893 else 894 first_hole = (h - payload); 895 896 } else { 897 /* fragment sits in the middle: split the hole */ 898 newh = thisfrag + (len / 8); 899 *newh = *h; 900 h->last_byte = start; 901 h->next_hole = (newh - payload); 902 newh->prev_hole = (h - payload); 903 if (newh->next_hole) 904 payload[newh->next_hole].prev_hole = (newh - payload); 905 } 906 907 /* finally copy this fragment and possibly return whole packet */ 908 memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len); 909 if (!done) 910 return NULL; 911 912 localip->ip_len = htons(total_len); 913 *lenp = total_len + IP_HDR_SIZE; 914 return localip; 915 } 916 917 static inline struct ip_udp_hdr *NetDefragment(struct ip_udp_hdr *ip, int *lenp) 918 { 919 u16 ip_off = ntohs(ip->ip_off); 920 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) 921 return ip; /* not a fragment */ 922 return __NetDefragment(ip, lenp); 923 } 924 925 #else /* !CONFIG_IP_DEFRAG */ 926 927 static inline struct ip_udp_hdr *NetDefragment(struct ip_udp_hdr *ip, int *lenp) 928 { 929 u16 ip_off = ntohs(ip->ip_off); 930 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) 931 return ip; /* not a fragment */ 932 return NULL; 933 } 934 #endif 935 936 /** 937 * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently 938 * drop others. 939 * 940 * @parma ip IP packet containing the ICMP 941 */ 942 static void receive_icmp(struct ip_udp_hdr *ip, int len, 943 struct in_addr src_ip, struct ethernet_hdr *et) 944 { 945 struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src; 946 947 switch (icmph->type) { 948 case ICMP_REDIRECT: 949 if (icmph->code != ICMP_REDIR_HOST) 950 return; 951 printf(" ICMP Host Redirect to %pI4 ", 952 &icmph->un.gateway); 953 break; 954 default: 955 #if defined(CONFIG_CMD_PING) 956 ping_receive(et, ip, len); 957 #endif 958 #ifdef CONFIG_CMD_TFTPPUT 959 if (packet_icmp_handler) 960 packet_icmp_handler(icmph->type, icmph->code, 961 ntohs(ip->udp_dst), src_ip, ntohs(ip->udp_src), 962 icmph->un.data, ntohs(ip->udp_len)); 963 #endif 964 break; 965 } 966 } 967 968 void net_process_received_packet(uchar *in_packet, int len) 969 { 970 struct ethernet_hdr *et; 971 struct ip_udp_hdr *ip; 972 struct in_addr dst_ip; 973 struct in_addr src_ip; 974 int eth_proto; 975 #if defined(CONFIG_CMD_CDP) 976 int iscdp; 977 #endif 978 ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid; 979 980 debug_cond(DEBUG_NET_PKT, "packet received\n"); 981 982 NetRxPacket = in_packet; 983 NetRxPacketLen = len; 984 et = (struct ethernet_hdr *)in_packet; 985 986 /* too small packet? */ 987 if (len < ETHER_HDR_SIZE) 988 return; 989 990 #ifdef CONFIG_API 991 if (push_packet) { 992 (*push_packet)(in_packet, len); 993 return; 994 } 995 #endif 996 997 #if defined(CONFIG_CMD_CDP) 998 /* keep track if packet is CDP */ 999 iscdp = is_cdp_packet(et->et_dest); 1000 #endif 1001 1002 myvlanid = ntohs(NetOurVLAN); 1003 if (myvlanid == (ushort)-1) 1004 myvlanid = VLAN_NONE; 1005 mynvlanid = ntohs(NetOurNativeVLAN); 1006 if (mynvlanid == (ushort)-1) 1007 mynvlanid = VLAN_NONE; 1008 1009 eth_proto = ntohs(et->et_protlen); 1010 1011 if (eth_proto < 1514) { 1012 struct e802_hdr *et802 = (struct e802_hdr *)et; 1013 /* 1014 * Got a 802.2 packet. Check the other protocol field. 1015 * XXX VLAN over 802.2+SNAP not implemented! 1016 */ 1017 eth_proto = ntohs(et802->et_prot); 1018 1019 ip = (struct ip_udp_hdr *)(in_packet + E802_HDR_SIZE); 1020 len -= E802_HDR_SIZE; 1021 1022 } else if (eth_proto != PROT_VLAN) { /* normal packet */ 1023 ip = (struct ip_udp_hdr *)(in_packet + ETHER_HDR_SIZE); 1024 len -= ETHER_HDR_SIZE; 1025 1026 } else { /* VLAN packet */ 1027 struct vlan_ethernet_hdr *vet = 1028 (struct vlan_ethernet_hdr *)et; 1029 1030 debug_cond(DEBUG_NET_PKT, "VLAN packet received\n"); 1031 1032 /* too small packet? */ 1033 if (len < VLAN_ETHER_HDR_SIZE) 1034 return; 1035 1036 /* if no VLAN active */ 1037 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE 1038 #if defined(CONFIG_CMD_CDP) 1039 && iscdp == 0 1040 #endif 1041 ) 1042 return; 1043 1044 cti = ntohs(vet->vet_tag); 1045 vlanid = cti & VLAN_IDMASK; 1046 eth_proto = ntohs(vet->vet_type); 1047 1048 ip = (struct ip_udp_hdr *)(in_packet + VLAN_ETHER_HDR_SIZE); 1049 len -= VLAN_ETHER_HDR_SIZE; 1050 } 1051 1052 debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto); 1053 1054 #if defined(CONFIG_CMD_CDP) 1055 if (iscdp) { 1056 cdp_receive((uchar *)ip, len); 1057 return; 1058 } 1059 #endif 1060 1061 if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) { 1062 if (vlanid == VLAN_NONE) 1063 vlanid = (mynvlanid & VLAN_IDMASK); 1064 /* not matched? */ 1065 if (vlanid != (myvlanid & VLAN_IDMASK)) 1066 return; 1067 } 1068 1069 switch (eth_proto) { 1070 1071 case PROT_ARP: 1072 ArpReceive(et, ip, len); 1073 break; 1074 1075 #ifdef CONFIG_CMD_RARP 1076 case PROT_RARP: 1077 rarp_receive(ip, len); 1078 break; 1079 #endif 1080 case PROT_IP: 1081 debug_cond(DEBUG_NET_PKT, "Got IP\n"); 1082 /* Before we start poking the header, make sure it is there */ 1083 if (len < IP_UDP_HDR_SIZE) { 1084 debug("len bad %d < %lu\n", len, 1085 (ulong)IP_UDP_HDR_SIZE); 1086 return; 1087 } 1088 /* Check the packet length */ 1089 if (len < ntohs(ip->ip_len)) { 1090 debug("len bad %d < %d\n", len, ntohs(ip->ip_len)); 1091 return; 1092 } 1093 len = ntohs(ip->ip_len); 1094 debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n", 1095 len, ip->ip_hl_v & 0xff); 1096 1097 /* Can't deal with anything except IPv4 */ 1098 if ((ip->ip_hl_v & 0xf0) != 0x40) 1099 return; 1100 /* Can't deal with IP options (headers != 20 bytes) */ 1101 if ((ip->ip_hl_v & 0x0f) > 0x05) 1102 return; 1103 /* Check the Checksum of the header */ 1104 if (!ip_checksum_ok((uchar *)ip, IP_HDR_SIZE)) { 1105 debug("checksum bad\n"); 1106 return; 1107 } 1108 /* If it is not for us, ignore it */ 1109 dst_ip = net_read_ip(&ip->ip_dst); 1110 if (net_ip.s_addr && dst_ip.s_addr != net_ip.s_addr && 1111 dst_ip.s_addr != 0xFFFFFFFF) { 1112 #ifdef CONFIG_MCAST_TFTP 1113 if (net_mcast_addr != dst_ip) 1114 #endif 1115 return; 1116 } 1117 /* Read source IP address for later use */ 1118 src_ip = net_read_ip(&ip->ip_src); 1119 /* 1120 * The function returns the unchanged packet if it's not 1121 * a fragment, and either the complete packet or NULL if 1122 * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL) 1123 */ 1124 ip = NetDefragment(ip, &len); 1125 if (!ip) 1126 return; 1127 /* 1128 * watch for ICMP host redirects 1129 * 1130 * There is no real handler code (yet). We just watch 1131 * for ICMP host redirect messages. In case anybody 1132 * sees these messages: please contact me 1133 * (wd@denx.de), or - even better - send me the 1134 * necessary fixes :-) 1135 * 1136 * Note: in all cases where I have seen this so far 1137 * it was a problem with the router configuration, 1138 * for instance when a router was configured in the 1139 * BOOTP reply, but the TFTP server was on the same 1140 * subnet. So this is probably a warning that your 1141 * configuration might be wrong. But I'm not really 1142 * sure if there aren't any other situations. 1143 * 1144 * Simon Glass <sjg@chromium.org>: We get an ICMP when 1145 * we send a tftp packet to a dead connection, or when 1146 * there is no server at the other end. 1147 */ 1148 if (ip->ip_p == IPPROTO_ICMP) { 1149 receive_icmp(ip, len, src_ip, et); 1150 return; 1151 } else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */ 1152 return; 1153 } 1154 1155 debug_cond(DEBUG_DEV_PKT, 1156 "received UDP (to=%pI4, from=%pI4, len=%d)\n", 1157 &dst_ip, &src_ip, len); 1158 1159 #ifdef CONFIG_UDP_CHECKSUM 1160 if (ip->udp_xsum != 0) { 1161 ulong xsum; 1162 ushort *sumptr; 1163 ushort sumlen; 1164 1165 xsum = ip->ip_p; 1166 xsum += (ntohs(ip->udp_len)); 1167 xsum += (ntohl(ip->ip_src.s_addr) >> 16) & 0x0000ffff; 1168 xsum += (ntohl(ip->ip_src.s_addr) >> 0) & 0x0000ffff; 1169 xsum += (ntohl(ip->ip_dst.s_addr) >> 16) & 0x0000ffff; 1170 xsum += (ntohl(ip->ip_dst.s_addr) >> 0) & 0x0000ffff; 1171 1172 sumlen = ntohs(ip->udp_len); 1173 sumptr = (ushort *) &(ip->udp_src); 1174 1175 while (sumlen > 1) { 1176 ushort sumdata; 1177 1178 sumdata = *sumptr++; 1179 xsum += ntohs(sumdata); 1180 sumlen -= 2; 1181 } 1182 if (sumlen > 0) { 1183 ushort sumdata; 1184 1185 sumdata = *(unsigned char *) sumptr; 1186 sumdata = (sumdata << 8) & 0xff00; 1187 xsum += sumdata; 1188 } 1189 while ((xsum >> 16) != 0) { 1190 xsum = (xsum & 0x0000ffff) + 1191 ((xsum >> 16) & 0x0000ffff); 1192 } 1193 if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) { 1194 printf(" UDP wrong checksum %08lx %08x\n", 1195 xsum, ntohs(ip->udp_xsum)); 1196 return; 1197 } 1198 } 1199 #endif 1200 1201 1202 #if defined (CONFIG_NETCONSOLE) && !(CONFIG_SPL_BUILD) 1203 nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE, 1204 src_ip, 1205 ntohs(ip->udp_dst), 1206 ntohs(ip->udp_src), 1207 ntohs(ip->udp_len) - UDP_HDR_SIZE); 1208 #endif 1209 /* 1210 * IP header OK. Pass the packet to the current handler. 1211 */ 1212 (*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE, 1213 ntohs(ip->udp_dst), 1214 src_ip, 1215 ntohs(ip->udp_src), 1216 ntohs(ip->udp_len) - UDP_HDR_SIZE); 1217 break; 1218 } 1219 } 1220 1221 1222 /**********************************************************************/ 1223 1224 static int net_check_prereq(enum proto_t protocol) 1225 { 1226 switch (protocol) { 1227 /* Fall through */ 1228 #if defined(CONFIG_CMD_PING) 1229 case PING: 1230 if (net_ping_ip.s_addr == 0) { 1231 puts("*** ERROR: ping address not given\n"); 1232 return 1; 1233 } 1234 goto common; 1235 #endif 1236 #if defined(CONFIG_CMD_SNTP) 1237 case SNTP: 1238 if (net_ntp_server.s_addr == 0) { 1239 puts("*** ERROR: NTP server address not given\n"); 1240 return 1; 1241 } 1242 goto common; 1243 #endif 1244 #if defined(CONFIG_CMD_DNS) 1245 case DNS: 1246 if (net_dns_server.s_addr == 0) { 1247 puts("*** ERROR: DNS server address not given\n"); 1248 return 1; 1249 } 1250 goto common; 1251 #endif 1252 #if defined(CONFIG_CMD_NFS) 1253 case NFS: 1254 #endif 1255 case TFTPGET: 1256 case TFTPPUT: 1257 if (net_server_ip.s_addr == 0) { 1258 puts("*** ERROR: `serverip' not set\n"); 1259 return 1; 1260 } 1261 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \ 1262 defined(CONFIG_CMD_DNS) 1263 common: 1264 #endif 1265 /* Fall through */ 1266 1267 case NETCONS: 1268 case TFTPSRV: 1269 if (net_ip.s_addr == 0) { 1270 puts("*** ERROR: `ipaddr' not set\n"); 1271 return 1; 1272 } 1273 /* Fall through */ 1274 1275 #ifdef CONFIG_CMD_RARP 1276 case RARP: 1277 #endif 1278 case BOOTP: 1279 case CDP: 1280 case DHCP: 1281 case LINKLOCAL: 1282 if (memcmp(net_ethaddr, "\0\0\0\0\0\0", 6) == 0) { 1283 int num = eth_get_dev_index(); 1284 1285 switch (num) { 1286 case -1: 1287 puts("*** ERROR: No ethernet found.\n"); 1288 return 1; 1289 case 0: 1290 puts("*** ERROR: `ethaddr' not set\n"); 1291 break; 1292 default: 1293 printf("*** ERROR: `eth%daddr' not set\n", 1294 num); 1295 break; 1296 } 1297 1298 NetStartAgain(); 1299 return 2; 1300 } 1301 /* Fall through */ 1302 default: 1303 return 0; 1304 } 1305 return 0; /* OK */ 1306 } 1307 /**********************************************************************/ 1308 1309 int 1310 NetEthHdrSize(void) 1311 { 1312 ushort myvlanid; 1313 1314 myvlanid = ntohs(NetOurVLAN); 1315 if (myvlanid == (ushort)-1) 1316 myvlanid = VLAN_NONE; 1317 1318 return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : 1319 VLAN_ETHER_HDR_SIZE; 1320 } 1321 1322 int 1323 NetSetEther(uchar *xet, const uchar *dest_ethaddr, uint prot) 1324 { 1325 struct ethernet_hdr *et = (struct ethernet_hdr *)xet; 1326 ushort myvlanid; 1327 1328 myvlanid = ntohs(NetOurVLAN); 1329 if (myvlanid == (ushort)-1) 1330 myvlanid = VLAN_NONE; 1331 1332 memcpy(et->et_dest, dest_ethaddr, 6); 1333 memcpy(et->et_src, net_ethaddr, 6); 1334 if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) { 1335 et->et_protlen = htons(prot); 1336 return ETHER_HDR_SIZE; 1337 } else { 1338 struct vlan_ethernet_hdr *vet = 1339 (struct vlan_ethernet_hdr *)xet; 1340 1341 vet->vet_vlan_type = htons(PROT_VLAN); 1342 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK)); 1343 vet->vet_type = htons(prot); 1344 return VLAN_ETHER_HDR_SIZE; 1345 } 1346 } 1347 1348 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot) 1349 { 1350 ushort protlen; 1351 1352 memcpy(et->et_dest, addr, 6); 1353 memcpy(et->et_src, net_ethaddr, 6); 1354 protlen = ntohs(et->et_protlen); 1355 if (protlen == PROT_VLAN) { 1356 struct vlan_ethernet_hdr *vet = 1357 (struct vlan_ethernet_hdr *)et; 1358 vet->vet_type = htons(prot); 1359 return VLAN_ETHER_HDR_SIZE; 1360 } else if (protlen > 1514) { 1361 et->et_protlen = htons(prot); 1362 return ETHER_HDR_SIZE; 1363 } else { 1364 /* 802.2 + SNAP */ 1365 struct e802_hdr *et802 = (struct e802_hdr *)et; 1366 et802->et_prot = htons(prot); 1367 return E802_HDR_SIZE; 1368 } 1369 } 1370 1371 void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source) 1372 { 1373 struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt; 1374 1375 /* 1376 * Construct an IP header. 1377 */ 1378 /* IP_HDR_SIZE / 4 (not including UDP) */ 1379 ip->ip_hl_v = 0x45; 1380 ip->ip_tos = 0; 1381 ip->ip_len = htons(IP_HDR_SIZE); 1382 ip->ip_id = htons(NetIPID++); 1383 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ 1384 ip->ip_ttl = 255; 1385 ip->ip_sum = 0; 1386 /* already in network byte order */ 1387 net_copy_ip((void *)&ip->ip_src, &source); 1388 /* already in network byte order */ 1389 net_copy_ip((void *)&ip->ip_dst, &dest); 1390 } 1391 1392 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport, 1393 int len) 1394 { 1395 struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt; 1396 1397 /* 1398 * If the data is an odd number of bytes, zero the 1399 * byte after the last byte so that the checksum 1400 * will work. 1401 */ 1402 if (len & 1) 1403 pkt[IP_UDP_HDR_SIZE + len] = 0; 1404 1405 net_set_ip_header(pkt, dest, net_ip); 1406 ip->ip_len = htons(IP_UDP_HDR_SIZE + len); 1407 ip->ip_p = IPPROTO_UDP; 1408 ip->ip_sum = compute_ip_checksum(ip, IP_HDR_SIZE); 1409 1410 ip->udp_src = htons(sport); 1411 ip->udp_dst = htons(dport); 1412 ip->udp_len = htons(UDP_HDR_SIZE + len); 1413 ip->udp_xsum = 0; 1414 } 1415 1416 void copy_filename(char *dst, const char *src, int size) 1417 { 1418 if (*src && (*src == '"')) { 1419 ++src; 1420 --size; 1421 } 1422 1423 while ((--size > 0) && *src && (*src != '"')) 1424 *dst++ = *src++; 1425 *dst = '\0'; 1426 } 1427 1428 #if defined(CONFIG_CMD_NFS) || \ 1429 defined(CONFIG_CMD_SNTP) || \ 1430 defined(CONFIG_CMD_DNS) 1431 /* 1432 * make port a little random (1024-17407) 1433 * This keeps the math somewhat trivial to compute, and seems to work with 1434 * all supported protocols/clients/servers 1435 */ 1436 unsigned int random_port(void) 1437 { 1438 return 1024 + (get_timer(0) % 0x4000); 1439 } 1440 #endif 1441 1442 void ip_to_string(struct in_addr x, char *s) 1443 { 1444 x.s_addr = ntohl(x.s_addr); 1445 sprintf(s, "%d.%d.%d.%d", 1446 (int) ((x.s_addr >> 24) & 0xff), 1447 (int) ((x.s_addr >> 16) & 0xff), 1448 (int) ((x.s_addr >> 8) & 0xff), 1449 (int) ((x.s_addr >> 0) & 0xff) 1450 ); 1451 } 1452 1453 void VLAN_to_string(ushort x, char *s) 1454 { 1455 x = ntohs(x); 1456 1457 if (x == (ushort)-1) 1458 x = VLAN_NONE; 1459 1460 if (x == VLAN_NONE) 1461 strcpy(s, "none"); 1462 else 1463 sprintf(s, "%d", x & VLAN_IDMASK); 1464 } 1465 1466 ushort string_to_VLAN(const char *s) 1467 { 1468 ushort id; 1469 1470 if (s == NULL) 1471 return htons(VLAN_NONE); 1472 1473 if (*s < '0' || *s > '9') 1474 id = VLAN_NONE; 1475 else 1476 id = (ushort)simple_strtoul(s, NULL, 10); 1477 1478 return htons(id); 1479 } 1480 1481 ushort getenv_VLAN(char *var) 1482 { 1483 return string_to_VLAN(getenv(var)); 1484 } 1485