1 /* 2 * Copied from Linux Monitor (LiMon) - Networking. 3 * 4 * Copyright 1994 - 2000 Neil Russell. 5 * (See License) 6 * Copyright 2000 Roland Borde 7 * Copyright 2000 Paolo Scaffardi 8 * Copyright 2000-2002 Wolfgang Denk, wd@denx.de 9 */ 10 11 /* 12 * General Desription: 13 * 14 * The user interface supports commands for BOOTP, RARP, and TFTP. 15 * Also, we support ARP internally. Depending on available data, 16 * these interact as follows: 17 * 18 * BOOTP: 19 * 20 * Prerequisites: - own ethernet address 21 * We want: - own IP address 22 * - TFTP server IP address 23 * - name of bootfile 24 * Next step: ARP 25 * 26 * RARP: 27 * 28 * Prerequisites: - own ethernet address 29 * We want: - own IP address 30 * - TFTP server IP address 31 * Next step: ARP 32 * 33 * ARP: 34 * 35 * Prerequisites: - own ethernet address 36 * - own IP address 37 * - TFTP server IP address 38 * We want: - TFTP server ethernet address 39 * Next step: TFTP 40 * 41 * DHCP: 42 * 43 * Prerequisites: - own ethernet address 44 * We want: - IP, Netmask, ServerIP, Gateway IP 45 * - bootfilename, lease time 46 * Next step: - TFTP 47 * 48 * TFTP: 49 * 50 * Prerequisites: - own ethernet address 51 * - own IP address 52 * - TFTP server IP address 53 * - TFTP server ethernet address 54 * - name of bootfile (if unknown, we use a default name 55 * derived from our own IP address) 56 * We want: - load the boot file 57 * Next step: none 58 * 59 * NFS: 60 * 61 * Prerequisites: - own ethernet address 62 * - own IP address 63 * - name of bootfile (if unknown, we use a default name 64 * derived from our own IP address) 65 * We want: - load the boot file 66 * Next step: none 67 * 68 * SNTP: 69 * 70 * Prerequisites: - own ethernet address 71 * - own IP address 72 * We want: - network time 73 * Next step: none 74 */ 75 76 77 #include <common.h> 78 #include <command.h> 79 #include <net.h> 80 #if defined(CONFIG_STATUS_LED) 81 #include <miiphy.h> 82 #include <status_led.h> 83 #endif 84 #include <watchdog.h> 85 #include <linux/compiler.h> 86 #include "arp.h" 87 #include "bootp.h" 88 #include "cdp.h" 89 #if defined(CONFIG_CMD_DNS) 90 #include "dns.h" 91 #endif 92 #include "nfs.h" 93 #include "ping.h" 94 #include "rarp.h" 95 #if defined(CONFIG_CMD_SNTP) 96 #include "sntp.h" 97 #endif 98 #include "tftp.h" 99 100 DECLARE_GLOBAL_DATA_PTR; 101 102 /** BOOTP EXTENTIONS **/ 103 104 /* Our subnet mask (0=unknown) */ 105 IPaddr_t NetOurSubnetMask; 106 /* Our gateways IP address */ 107 IPaddr_t NetOurGatewayIP; 108 /* Our DNS IP address */ 109 IPaddr_t NetOurDNSIP; 110 #if defined(CONFIG_BOOTP_DNS2) 111 /* Our 2nd DNS IP address */ 112 IPaddr_t NetOurDNS2IP; 113 #endif 114 /* Our NIS domain */ 115 char NetOurNISDomain[32] = {0,}; 116 /* Our hostname */ 117 char NetOurHostName[32] = {0,}; 118 /* Our bootpath */ 119 char NetOurRootPath[64] = {0,}; 120 /* Our bootfile size in blocks */ 121 ushort NetBootFileSize; 122 123 #ifdef CONFIG_MCAST_TFTP /* Multicast TFTP */ 124 IPaddr_t Mcast_addr; 125 #endif 126 127 /** END OF BOOTP EXTENTIONS **/ 128 129 /* The actual transferred size of the bootfile (in bytes) */ 130 ulong NetBootFileXferSize; 131 /* Our ethernet address */ 132 uchar NetOurEther[6]; 133 /* Boot server enet address */ 134 uchar NetServerEther[6]; 135 /* Our IP addr (0 = unknown) */ 136 IPaddr_t NetOurIP; 137 /* Server IP addr (0 = unknown) */ 138 IPaddr_t NetServerIP; 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 uchar NetBcastAddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 147 uchar NetEtherNullAddr[6]; 148 #ifdef CONFIG_API 149 void (*push_packet)(void *, int len) = 0; 150 #endif 151 /* Network loop state */ 152 int NetState; 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 BootFile[128]; 168 169 #if defined(CONFIG_CMD_SNTP) 170 /* NTP server IP address */ 171 IPaddr_t NetNtpServerIP; 172 /* offset time from UTC */ 173 int NetTimeOffset; 174 #endif 175 176 uchar PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN]; 177 178 /* Receive packet */ 179 uchar *NetRxPackets[PKTBUFSRX]; 180 181 /* Current RX packet handler */ 182 static rxhand_f *packetHandler; 183 #ifdef CONFIG_CMD_TFTPPUT 184 static rxhand_icmp_f *packet_icmp_handler; /* Current ICMP rx handler */ 185 #endif 186 /* Current timeout handler */ 187 static thand_f *timeHandler; 188 /* Time base value */ 189 static ulong timeStart; 190 /* Current timeout value */ 191 static ulong timeDelta; 192 /* THE transmit packet */ 193 uchar *NetTxPacket; 194 195 static int net_check_prereq(enum proto_t protocol); 196 197 static int NetTryCount; 198 199 /**********************************************************************/ 200 201 /* 202 * Check if autoload is enabled. If so, use either NFS or TFTP to download 203 * the boot file. 204 */ 205 void net_auto_load(void) 206 { 207 const char *s = getenv("autoload"); 208 209 if (s != NULL) { 210 if (*s == 'n') { 211 /* 212 * Just use BOOTP/RARP to configure system; 213 * Do not use TFTP to load the bootfile. 214 */ 215 NetState = NETLOOP_SUCCESS; 216 return; 217 } 218 #if defined(CONFIG_CMD_NFS) 219 if (strcmp(s, "NFS") == 0) { 220 /* 221 * Use NFS to load the bootfile. 222 */ 223 NfsStart(); 224 return; 225 } 226 #endif 227 } 228 TftpStart(TFTPGET); 229 } 230 231 static void NetInitLoop(enum proto_t protocol) 232 { 233 static int env_changed_id; 234 int env_id = get_env_id(); 235 236 /* update only when the environment has changed */ 237 if (env_changed_id != env_id) { 238 NetOurIP = getenv_IPaddr("ipaddr"); 239 NetOurGatewayIP = getenv_IPaddr("gatewayip"); 240 NetOurSubnetMask = getenv_IPaddr("netmask"); 241 NetServerIP = getenv_IPaddr("serverip"); 242 NetOurNativeVLAN = getenv_VLAN("nvlan"); 243 NetOurVLAN = getenv_VLAN("vlan"); 244 #if defined(CONFIG_CMD_DNS) 245 NetOurDNSIP = getenv_IPaddr("dnsip"); 246 #endif 247 env_changed_id = env_id; 248 } 249 250 return; 251 } 252 253 /**********************************************************************/ 254 /* 255 * Main network processing loop. 256 */ 257 258 int NetLoop(enum proto_t protocol) 259 { 260 bd_t *bd = gd->bd; 261 int ret = -1; 262 263 NetRestarted = 0; 264 NetDevExists = 0; 265 266 NetTxPacket = NULL; 267 NetTryCount = 1; 268 269 ArpInit(); 270 271 if (!NetTxPacket) { 272 int i; 273 /* 274 * Setup packet buffers, aligned correctly. 275 */ 276 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1); 277 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN; 278 for (i = 0; i < PKTBUFSRX; i++) 279 NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN; 280 } 281 282 bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start"); 283 eth_halt(); 284 eth_set_current(); 285 if (eth_init(bd) < 0) { 286 eth_halt(); 287 return -1; 288 } 289 290 restart: 291 memcpy(NetOurEther, eth_get_dev()->enetaddr, 6); 292 293 NetState = NETLOOP_CONTINUE; 294 295 /* 296 * Start the ball rolling with the given start function. From 297 * here on, this code is a state machine driven by received 298 * packets and timer events. 299 */ 300 NetInitLoop(protocol); 301 302 switch (net_check_prereq(protocol)) { 303 case 1: 304 /* network not configured */ 305 eth_halt(); 306 return -1; 307 308 case 2: 309 /* network device not configured */ 310 break; 311 312 case 0: 313 NetDevExists = 1; 314 NetBootFileXferSize = 0; 315 switch (protocol) { 316 case TFTPGET: 317 #ifdef CONFIG_CMD_TFTPPUT 318 case TFTPPUT: 319 #endif 320 /* always use ARP to get server ethernet address */ 321 TftpStart(protocol); 322 break; 323 #ifdef CONFIG_CMD_TFTPSRV 324 case TFTPSRV: 325 TftpStartServer(); 326 break; 327 #endif 328 #if defined(CONFIG_CMD_DHCP) 329 case DHCP: 330 BootpTry = 0; 331 NetOurIP = 0; 332 DhcpRequest(); /* Basically same as BOOTP */ 333 break; 334 #endif 335 336 case BOOTP: 337 BootpTry = 0; 338 NetOurIP = 0; 339 BootpRequest(); 340 break; 341 342 #if defined(CONFIG_CMD_RARP) 343 case RARP: 344 RarpTry = 0; 345 NetOurIP = 0; 346 RarpRequest(); 347 break; 348 #endif 349 #if defined(CONFIG_CMD_PING) 350 case PING: 351 ping_start(); 352 break; 353 #endif 354 #if defined(CONFIG_CMD_NFS) 355 case NFS: 356 NfsStart(); 357 break; 358 #endif 359 #if defined(CONFIG_CMD_CDP) 360 case CDP: 361 CDPStart(); 362 break; 363 #endif 364 #ifdef CONFIG_NETCONSOLE 365 case NETCONS: 366 NcStart(); 367 break; 368 #endif 369 #if defined(CONFIG_CMD_SNTP) 370 case SNTP: 371 SntpStart(); 372 break; 373 #endif 374 #if defined(CONFIG_CMD_DNS) 375 case DNS: 376 DnsStart(); 377 break; 378 #endif 379 default: 380 break; 381 } 382 383 break; 384 } 385 386 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 387 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ 388 defined(CONFIG_STATUS_LED) && \ 389 defined(STATUS_LED_RED) 390 /* 391 * Echo the inverted link state to the fault LED. 392 */ 393 if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) 394 status_led_set(STATUS_LED_RED, STATUS_LED_OFF); 395 else 396 status_led_set(STATUS_LED_RED, STATUS_LED_ON); 397 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 398 #endif /* CONFIG_MII, ... */ 399 400 /* 401 * Main packet reception loop. Loop receiving packets until 402 * someone sets `NetState' to a state that terminates. 403 */ 404 for (;;) { 405 WATCHDOG_RESET(); 406 #ifdef CONFIG_SHOW_ACTIVITY 407 show_activity(1); 408 #endif 409 /* 410 * Check the ethernet for a new packet. The ethernet 411 * receive routine will process it. 412 */ 413 eth_rx(); 414 415 /* 416 * Abort if ctrl-c was pressed. 417 */ 418 if (ctrlc()) { 419 eth_halt(); 420 puts("\nAbort\n"); 421 goto done; 422 } 423 424 ArpTimeoutCheck(); 425 426 /* 427 * Check for a timeout, and run the timeout handler 428 * if we have one. 429 */ 430 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) { 431 thand_f *x; 432 433 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) 434 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ 435 defined(CONFIG_STATUS_LED) && \ 436 defined(STATUS_LED_RED) 437 /* 438 * Echo the inverted link state to the fault LED. 439 */ 440 if (miiphy_link(eth_get_dev()->name, 441 CONFIG_SYS_FAULT_MII_ADDR)) { 442 status_led_set(STATUS_LED_RED, STATUS_LED_OFF); 443 } else { 444 status_led_set(STATUS_LED_RED, STATUS_LED_ON); 445 } 446 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ 447 #endif /* CONFIG_MII, ... */ 448 x = timeHandler; 449 timeHandler = (thand_f *)0; 450 (*x)(); 451 } 452 453 454 switch (NetState) { 455 456 case NETLOOP_RESTART: 457 NetRestarted = 1; 458 goto restart; 459 460 case NETLOOP_SUCCESS: 461 if (NetBootFileXferSize > 0) { 462 char buf[20]; 463 printf("Bytes transferred = %ld (%lx hex)\n", 464 NetBootFileXferSize, 465 NetBootFileXferSize); 466 sprintf(buf, "%lX", NetBootFileXferSize); 467 setenv("filesize", buf); 468 469 sprintf(buf, "%lX", (unsigned long)load_addr); 470 setenv("fileaddr", buf); 471 } 472 eth_halt(); 473 ret = NetBootFileXferSize; 474 goto done; 475 476 case NETLOOP_FAIL: 477 goto done; 478 } 479 } 480 481 done: 482 #ifdef CONFIG_CMD_TFTPPUT 483 /* Clear out the handlers */ 484 NetSetHandler(NULL); 485 net_set_icmp_handler(NULL); 486 #endif 487 return ret; 488 } 489 490 /**********************************************************************/ 491 492 static void 493 startAgainTimeout(void) 494 { 495 NetState = NETLOOP_RESTART; 496 } 497 498 static void 499 startAgainHandler(uchar *pkt, unsigned dest, IPaddr_t sip, 500 unsigned src, unsigned len) 501 { 502 /* Totally ignore the packet */ 503 } 504 505 void NetStartAgain(void) 506 { 507 char *nretry; 508 int retry_forever = 0; 509 unsigned long retrycnt = 0; 510 511 nretry = getenv("netretry"); 512 if (nretry) { 513 if (!strcmp(nretry, "yes")) 514 retry_forever = 1; 515 else if (!strcmp(nretry, "no")) 516 retrycnt = 0; 517 else if (!strcmp(nretry, "once")) 518 retrycnt = 1; 519 else 520 retrycnt = simple_strtoul(nretry, NULL, 0); 521 } else 522 retry_forever = 1; 523 524 if ((!retry_forever) && (NetTryCount >= retrycnt)) { 525 eth_halt(); 526 NetState = NETLOOP_FAIL; 527 return; 528 } 529 530 NetTryCount++; 531 532 eth_halt(); 533 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER) 534 eth_try_another(!NetRestarted); 535 #endif 536 eth_init(gd->bd); 537 if (NetRestartWrap) { 538 NetRestartWrap = 0; 539 if (NetDevExists) { 540 NetSetTimeout(10000UL, startAgainTimeout); 541 NetSetHandler(startAgainHandler); 542 } else { 543 NetState = NETLOOP_FAIL; 544 } 545 } else { 546 NetState = NETLOOP_RESTART; 547 } 548 } 549 550 /**********************************************************************/ 551 /* 552 * Miscelaneous bits. 553 */ 554 555 rxhand_f * 556 NetGetHandler(void) 557 { 558 return packetHandler; 559 } 560 561 562 void 563 NetSetHandler(rxhand_f *f) 564 { 565 packetHandler = f; 566 } 567 568 #ifdef CONFIG_CMD_TFTPPUT 569 void net_set_icmp_handler(rxhand_icmp_f *f) 570 { 571 packet_icmp_handler = f; 572 } 573 #endif 574 575 void 576 NetSetTimeout(ulong iv, thand_f *f) 577 { 578 if (iv == 0) { 579 timeHandler = (thand_f *)0; 580 } else { 581 timeHandler = f; 582 timeStart = get_timer(0); 583 timeDelta = iv; 584 } 585 } 586 587 int NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, 588 int payload_len) 589 { 590 uchar *pkt; 591 int need_arp = 0; 592 int eth_hdr_size; 593 int pkt_hdr_size; 594 595 /* convert to new style broadcast */ 596 if (dest == 0) 597 dest = 0xFFFFFFFF; 598 599 /* if broadcast, make the ether address a broadcast and don't do ARP */ 600 if (dest == 0xFFFFFFFF) 601 ether = NetBcastAddr; 602 603 /* 604 * if MAC address was not discovered yet, save the packet and do 605 * an ARP request 606 */ 607 if (memcmp(ether, NetEtherNullAddr, 6) == 0) { 608 need_arp = 1; 609 pkt = NetArpWaitTxPacket; 610 } else 611 pkt = (uchar *)NetTxPacket; 612 613 eth_hdr_size = NetSetEther(pkt, ether, PROT_IP); 614 pkt += eth_hdr_size; 615 net_set_udp_header(pkt, dest, dport, sport, payload_len); 616 pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE; 617 618 if (need_arp) { 619 debug("sending ARP for %pI4\n", &dest); 620 621 /* save the ip and eth addr for the packet to send after arp */ 622 NetArpWaitPacketIP = dest; 623 NetArpWaitPacketMAC = ether; 624 625 /* 626 * Copy the packet data from the NetTxPacket into the 627 * NetArpWaitTxPacket to send after arp 628 */ 629 memcpy(pkt + IP_UDP_HDR_SIZE, (uchar *)NetTxPacket + 630 pkt_hdr_size, payload_len); 631 632 /* size of the waiting packet */ 633 NetArpWaitTxPacketSize = pkt_hdr_size + payload_len; 634 635 /* and do the ARP request */ 636 NetArpWaitTry = 1; 637 NetArpWaitTimerStart = get_timer(0); 638 ArpRequest(); 639 return 1; /* waiting */ 640 } else { 641 debug("sending UDP to %pI4/%pM\n", &dest, ether); 642 NetSendPacket(NetTxPacket, pkt_hdr_size + payload_len); 643 return 0; /* transmitted */ 644 } 645 } 646 647 #ifdef CONFIG_IP_DEFRAG 648 /* 649 * This function collects fragments in a single packet, according 650 * to the algorithm in RFC815. It returns NULL or the pointer to 651 * a complete packet, in static storage 652 */ 653 #ifndef CONFIG_NET_MAXDEFRAG 654 #define CONFIG_NET_MAXDEFRAG 16384 655 #endif 656 /* 657 * MAXDEFRAG, above, is chosen in the config file and is real data 658 * so we need to add the NFS overhead, which is more than TFTP. 659 * To use sizeof in the internal unnamed structures, we need a real 660 * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately). 661 * The compiler doesn't complain nor allocates the actual structure 662 */ 663 static struct rpc_t rpc_specimen; 664 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply)) 665 666 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE) 667 668 /* 669 * this is the packet being assembled, either data or frag control. 670 * Fragments go by 8 bytes, so this union must be 8 bytes long 671 */ 672 struct hole { 673 /* first_byte is address of this structure */ 674 u16 last_byte; /* last byte in this hole + 1 (begin of next hole) */ 675 u16 next_hole; /* index of next (in 8-b blocks), 0 == none */ 676 u16 prev_hole; /* index of prev, 0 == none */ 677 u16 unused; 678 }; 679 680 static struct ip_udp_hdr *__NetDefragment(struct ip_udp_hdr *ip, int *lenp) 681 { 682 static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN); 683 static u16 first_hole, total_len; 684 struct hole *payload, *thisfrag, *h, *newh; 685 struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff; 686 uchar *indata = (uchar *)ip; 687 int offset8, start, len, done = 0; 688 u16 ip_off = ntohs(ip->ip_off); 689 690 /* payload starts after IP header, this fragment is in there */ 691 payload = (struct hole *)(pkt_buff + IP_HDR_SIZE); 692 offset8 = (ip_off & IP_OFFS); 693 thisfrag = payload + offset8; 694 start = offset8 * 8; 695 len = ntohs(ip->ip_len) - IP_HDR_SIZE; 696 697 if (start + len > IP_MAXUDP) /* fragment extends too far */ 698 return NULL; 699 700 if (!total_len || localip->ip_id != ip->ip_id) { 701 /* new (or different) packet, reset structs */ 702 total_len = 0xffff; 703 payload[0].last_byte = ~0; 704 payload[0].next_hole = 0; 705 payload[0].prev_hole = 0; 706 first_hole = 0; 707 /* any IP header will work, copy the first we received */ 708 memcpy(localip, ip, IP_HDR_SIZE); 709 } 710 711 /* 712 * What follows is the reassembly algorithm. We use the payload 713 * array as a linked list of hole descriptors, as each hole starts 714 * at a multiple of 8 bytes. However, last byte can be whatever value, 715 * so it is represented as byte count, not as 8-byte blocks. 716 */ 717 718 h = payload + first_hole; 719 while (h->last_byte < start) { 720 if (!h->next_hole) { 721 /* no hole that far away */ 722 return NULL; 723 } 724 h = payload + h->next_hole; 725 } 726 727 /* last fragment may be 1..7 bytes, the "+7" forces acceptance */ 728 if (offset8 + ((len + 7) / 8) <= h - payload) { 729 /* no overlap with holes (dup fragment?) */ 730 return NULL; 731 } 732 733 if (!(ip_off & IP_FLAGS_MFRAG)) { 734 /* no more fragmentss: truncate this (last) hole */ 735 total_len = start + len; 736 h->last_byte = start + len; 737 } 738 739 /* 740 * There is some overlap: fix the hole list. This code doesn't 741 * deal with a fragment that overlaps with two different holes 742 * (thus being a superset of a previously-received fragment). 743 */ 744 745 if ((h >= thisfrag) && (h->last_byte <= start + len)) { 746 /* complete overlap with hole: remove hole */ 747 if (!h->prev_hole && !h->next_hole) { 748 /* last remaining hole */ 749 done = 1; 750 } else if (!h->prev_hole) { 751 /* first hole */ 752 first_hole = h->next_hole; 753 payload[h->next_hole].prev_hole = 0; 754 } else if (!h->next_hole) { 755 /* last hole */ 756 payload[h->prev_hole].next_hole = 0; 757 } else { 758 /* in the middle of the list */ 759 payload[h->next_hole].prev_hole = h->prev_hole; 760 payload[h->prev_hole].next_hole = h->next_hole; 761 } 762 763 } else if (h->last_byte <= start + len) { 764 /* overlaps with final part of the hole: shorten this hole */ 765 h->last_byte = start; 766 767 } else if (h >= thisfrag) { 768 /* overlaps with initial part of the hole: move this hole */ 769 newh = thisfrag + (len / 8); 770 *newh = *h; 771 h = newh; 772 if (h->next_hole) 773 payload[h->next_hole].prev_hole = (h - payload); 774 if (h->prev_hole) 775 payload[h->prev_hole].next_hole = (h - payload); 776 else 777 first_hole = (h - payload); 778 779 } else { 780 /* fragment sits in the middle: split the hole */ 781 newh = thisfrag + (len / 8); 782 *newh = *h; 783 h->last_byte = start; 784 h->next_hole = (newh - payload); 785 newh->prev_hole = (h - payload); 786 if (newh->next_hole) 787 payload[newh->next_hole].prev_hole = (newh - payload); 788 } 789 790 /* finally copy this fragment and possibly return whole packet */ 791 memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len); 792 if (!done) 793 return NULL; 794 795 localip->ip_len = htons(total_len); 796 *lenp = total_len + IP_HDR_SIZE; 797 return localip; 798 } 799 800 static inline struct ip_udp_hdr *NetDefragment(struct ip_udp_hdr *ip, int *lenp) 801 { 802 u16 ip_off = ntohs(ip->ip_off); 803 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) 804 return ip; /* not a fragment */ 805 return __NetDefragment(ip, lenp); 806 } 807 808 #else /* !CONFIG_IP_DEFRAG */ 809 810 static inline struct ip_udp_hdr *NetDefragment(struct ip_udp_hdr *ip, int *lenp) 811 { 812 u16 ip_off = ntohs(ip->ip_off); 813 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) 814 return ip; /* not a fragment */ 815 return NULL; 816 } 817 #endif 818 819 /** 820 * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently 821 * drop others. 822 * 823 * @parma ip IP packet containing the ICMP 824 */ 825 static void receive_icmp(struct ip_udp_hdr *ip, int len, 826 IPaddr_t src_ip, struct ethernet_hdr *et) 827 { 828 struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src; 829 830 switch (icmph->type) { 831 case ICMP_REDIRECT: 832 if (icmph->code != ICMP_REDIR_HOST) 833 return; 834 printf(" ICMP Host Redirect to %pI4 ", 835 &icmph->un.gateway); 836 break; 837 default: 838 #if defined(CONFIG_CMD_PING) 839 ping_receive(et, ip, len); 840 #endif 841 #ifdef CONFIG_CMD_TFTPPUT 842 if (packet_icmp_handler) 843 packet_icmp_handler(icmph->type, icmph->code, 844 ntohs(ip->udp_dst), src_ip, ntohs(ip->udp_src), 845 icmph->un.data, ntohs(ip->udp_len)); 846 #endif 847 break; 848 } 849 } 850 851 void 852 NetReceive(uchar *inpkt, int len) 853 { 854 struct ethernet_hdr *et; 855 struct ip_udp_hdr *ip; 856 IPaddr_t dst_ip; 857 IPaddr_t src_ip; 858 int eth_proto; 859 #if defined(CONFIG_CMD_CDP) 860 int iscdp; 861 #endif 862 ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid; 863 864 debug("packet received\n"); 865 866 NetRxPacket = inpkt; 867 NetRxPacketLen = len; 868 et = (struct ethernet_hdr *)inpkt; 869 870 /* too small packet? */ 871 if (len < ETHER_HDR_SIZE) 872 return; 873 874 #ifdef CONFIG_API 875 if (push_packet) { 876 (*push_packet)(inpkt, len); 877 return; 878 } 879 #endif 880 881 #if defined(CONFIG_CMD_CDP) 882 /* keep track if packet is CDP */ 883 iscdp = is_cdp_packet(et->et_dest); 884 #endif 885 886 myvlanid = ntohs(NetOurVLAN); 887 if (myvlanid == (ushort)-1) 888 myvlanid = VLAN_NONE; 889 mynvlanid = ntohs(NetOurNativeVLAN); 890 if (mynvlanid == (ushort)-1) 891 mynvlanid = VLAN_NONE; 892 893 eth_proto = ntohs(et->et_protlen); 894 895 debug("packet received\n"); 896 897 if (eth_proto < 1514) { 898 struct e802_hdr *et802 = (struct e802_hdr *)et; 899 /* 900 * Got a 802.2 packet. Check the other protocol field. 901 * XXX VLAN over 802.2+SNAP not implemented! 902 */ 903 eth_proto = ntohs(et802->et_prot); 904 905 ip = (struct ip_udp_hdr *)(inpkt + E802_HDR_SIZE); 906 len -= E802_HDR_SIZE; 907 908 } else if (eth_proto != PROT_VLAN) { /* normal packet */ 909 ip = (struct ip_udp_hdr *)(inpkt + ETHER_HDR_SIZE); 910 len -= ETHER_HDR_SIZE; 911 912 } else { /* VLAN packet */ 913 struct vlan_ethernet_hdr *vet = 914 (struct vlan_ethernet_hdr *)et; 915 916 debug("VLAN packet received\n"); 917 918 /* too small packet? */ 919 if (len < VLAN_ETHER_HDR_SIZE) 920 return; 921 922 /* if no VLAN active */ 923 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE 924 #if defined(CONFIG_CMD_CDP) 925 && iscdp == 0 926 #endif 927 ) 928 return; 929 930 cti = ntohs(vet->vet_tag); 931 vlanid = cti & VLAN_IDMASK; 932 eth_proto = ntohs(vet->vet_type); 933 934 ip = (struct ip_udp_hdr *)(inpkt + VLAN_ETHER_HDR_SIZE); 935 len -= VLAN_ETHER_HDR_SIZE; 936 } 937 938 debug("Receive from protocol 0x%x\n", eth_proto); 939 940 #if defined(CONFIG_CMD_CDP) 941 if (iscdp) { 942 cdp_receive((uchar *)ip, len); 943 return; 944 } 945 #endif 946 947 if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) { 948 if (vlanid == VLAN_NONE) 949 vlanid = (mynvlanid & VLAN_IDMASK); 950 /* not matched? */ 951 if (vlanid != (myvlanid & VLAN_IDMASK)) 952 return; 953 } 954 955 switch (eth_proto) { 956 957 case PROT_ARP: 958 ArpReceive(et, ip, len); 959 break; 960 961 #ifdef CONFIG_CMD_RARP 962 case PROT_RARP: 963 rarp_receive(ip, len); 964 break; 965 #endif 966 case PROT_IP: 967 debug("Got IP\n"); 968 /* Before we start poking the header, make sure it is there */ 969 if (len < IP_UDP_HDR_SIZE) { 970 debug("len bad %d < %lu\n", len, 971 (ulong)IP_UDP_HDR_SIZE); 972 return; 973 } 974 /* Check the packet length */ 975 if (len < ntohs(ip->ip_len)) { 976 printf("len bad %d < %d\n", len, ntohs(ip->ip_len)); 977 return; 978 } 979 len = ntohs(ip->ip_len); 980 debug("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff); 981 982 /* Can't deal with anything except IPv4 */ 983 if ((ip->ip_hl_v & 0xf0) != 0x40) 984 return; 985 /* Can't deal with IP options (headers != 20 bytes) */ 986 if ((ip->ip_hl_v & 0x0f) > 0x05) 987 return; 988 /* Check the Checksum of the header */ 989 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE / 2)) { 990 puts("checksum bad\n"); 991 return; 992 } 993 /* If it is not for us, ignore it */ 994 dst_ip = NetReadIP(&ip->ip_dst); 995 if (NetOurIP && dst_ip != NetOurIP && dst_ip != 0xFFFFFFFF) { 996 #ifdef CONFIG_MCAST_TFTP 997 if (Mcast_addr != dst_ip) 998 #endif 999 return; 1000 } 1001 /* Read source IP address for later use */ 1002 src_ip = NetReadIP(&ip->ip_src); 1003 /* 1004 * The function returns the unchanged packet if it's not 1005 * a fragment, and either the complete packet or NULL if 1006 * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL) 1007 */ 1008 ip = NetDefragment(ip, &len); 1009 if (!ip) 1010 return; 1011 /* 1012 * watch for ICMP host redirects 1013 * 1014 * There is no real handler code (yet). We just watch 1015 * for ICMP host redirect messages. In case anybody 1016 * sees these messages: please contact me 1017 * (wd@denx.de), or - even better - send me the 1018 * necessary fixes :-) 1019 * 1020 * Note: in all cases where I have seen this so far 1021 * it was a problem with the router configuration, 1022 * for instance when a router was configured in the 1023 * BOOTP reply, but the TFTP server was on the same 1024 * subnet. So this is probably a warning that your 1025 * configuration might be wrong. But I'm not really 1026 * sure if there aren't any other situations. 1027 * 1028 * Simon Glass <sjg@chromium.org>: We get an ICMP when 1029 * we send a tftp packet to a dead connection, or when 1030 * there is no server at the other end. 1031 */ 1032 if (ip->ip_p == IPPROTO_ICMP) { 1033 receive_icmp(ip, len, src_ip, et); 1034 return; 1035 } else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */ 1036 return; 1037 } 1038 1039 #ifdef CONFIG_UDP_CHECKSUM 1040 if (ip->udp_xsum != 0) { 1041 ulong xsum; 1042 ushort *sumptr; 1043 ushort sumlen; 1044 1045 xsum = ip->ip_p; 1046 xsum += (ntohs(ip->udp_len)); 1047 xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff; 1048 xsum += (ntohl(ip->ip_src) >> 0) & 0x0000ffff; 1049 xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff; 1050 xsum += (ntohl(ip->ip_dst) >> 0) & 0x0000ffff; 1051 1052 sumlen = ntohs(ip->udp_len); 1053 sumptr = (ushort *) &(ip->udp_src); 1054 1055 while (sumlen > 1) { 1056 ushort sumdata; 1057 1058 sumdata = *sumptr++; 1059 xsum += ntohs(sumdata); 1060 sumlen -= 2; 1061 } 1062 if (sumlen > 0) { 1063 ushort sumdata; 1064 1065 sumdata = *(unsigned char *) sumptr; 1066 sumdata = (sumdata << 8) & 0xff00; 1067 xsum += sumdata; 1068 } 1069 while ((xsum >> 16) != 0) { 1070 xsum = (xsum & 0x0000ffff) + 1071 ((xsum >> 16) & 0x0000ffff); 1072 } 1073 if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) { 1074 printf(" UDP wrong checksum %08lx %08x\n", 1075 xsum, ntohs(ip->udp_xsum)); 1076 return; 1077 } 1078 } 1079 #endif 1080 1081 1082 #ifdef CONFIG_NETCONSOLE 1083 nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE, 1084 ntohs(ip->udp_dst), 1085 ntohs(ip->udp_src), 1086 ntohs(ip->udp_len) - UDP_HDR_SIZE); 1087 #endif 1088 /* 1089 * IP header OK. Pass the packet to the current handler. 1090 */ 1091 (*packetHandler)((uchar *)ip + IP_UDP_HDR_SIZE, 1092 ntohs(ip->udp_dst), 1093 src_ip, 1094 ntohs(ip->udp_src), 1095 ntohs(ip->udp_len) - UDP_HDR_SIZE); 1096 break; 1097 } 1098 } 1099 1100 1101 /**********************************************************************/ 1102 1103 static int net_check_prereq(enum proto_t protocol) 1104 { 1105 switch (protocol) { 1106 /* Fall through */ 1107 #if defined(CONFIG_CMD_PING) 1108 case PING: 1109 if (NetPingIP == 0) { 1110 puts("*** ERROR: ping address not given\n"); 1111 return 1; 1112 } 1113 goto common; 1114 #endif 1115 #if defined(CONFIG_CMD_SNTP) 1116 case SNTP: 1117 if (NetNtpServerIP == 0) { 1118 puts("*** ERROR: NTP server address not given\n"); 1119 return 1; 1120 } 1121 goto common; 1122 #endif 1123 #if defined(CONFIG_CMD_DNS) 1124 case DNS: 1125 if (NetOurDNSIP == 0) { 1126 puts("*** ERROR: DNS server address not given\n"); 1127 return 1; 1128 } 1129 goto common; 1130 #endif 1131 #if defined(CONFIG_CMD_NFS) 1132 case NFS: 1133 #endif 1134 case TFTPGET: 1135 case TFTPPUT: 1136 if (NetServerIP == 0) { 1137 puts("*** ERROR: `serverip' not set\n"); 1138 return 1; 1139 } 1140 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \ 1141 defined(CONFIG_CMD_DNS) 1142 common: 1143 #endif 1144 /* Fall through */ 1145 1146 case NETCONS: 1147 case TFTPSRV: 1148 if (NetOurIP == 0) { 1149 puts("*** ERROR: `ipaddr' not set\n"); 1150 return 1; 1151 } 1152 /* Fall through */ 1153 1154 #ifdef CONFIG_CMD_RARP 1155 case RARP: 1156 #endif 1157 case BOOTP: 1158 case CDP: 1159 case DHCP: 1160 if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) { 1161 int num = eth_get_dev_index(); 1162 1163 switch (num) { 1164 case -1: 1165 puts("*** ERROR: No ethernet found.\n"); 1166 return 1; 1167 case 0: 1168 puts("*** ERROR: `ethaddr' not set\n"); 1169 break; 1170 default: 1171 printf("*** ERROR: `eth%daddr' not set\n", 1172 num); 1173 break; 1174 } 1175 1176 NetStartAgain(); 1177 return 2; 1178 } 1179 /* Fall through */ 1180 default: 1181 return 0; 1182 } 1183 return 0; /* OK */ 1184 } 1185 /**********************************************************************/ 1186 1187 int 1188 NetCksumOk(uchar *ptr, int len) 1189 { 1190 return !((NetCksum(ptr, len) + 1) & 0xfffe); 1191 } 1192 1193 1194 unsigned 1195 NetCksum(uchar *ptr, int len) 1196 { 1197 ulong xsum; 1198 ushort *p = (ushort *)ptr; 1199 1200 xsum = 0; 1201 while (len-- > 0) 1202 xsum += *p++; 1203 xsum = (xsum & 0xffff) + (xsum >> 16); 1204 xsum = (xsum & 0xffff) + (xsum >> 16); 1205 return xsum & 0xffff; 1206 } 1207 1208 int 1209 NetEthHdrSize(void) 1210 { 1211 ushort myvlanid; 1212 1213 myvlanid = ntohs(NetOurVLAN); 1214 if (myvlanid == (ushort)-1) 1215 myvlanid = VLAN_NONE; 1216 1217 return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : 1218 VLAN_ETHER_HDR_SIZE; 1219 } 1220 1221 int 1222 NetSetEther(uchar *xet, uchar * addr, uint prot) 1223 { 1224 struct ethernet_hdr *et = (struct ethernet_hdr *)xet; 1225 ushort myvlanid; 1226 1227 myvlanid = ntohs(NetOurVLAN); 1228 if (myvlanid == (ushort)-1) 1229 myvlanid = VLAN_NONE; 1230 1231 memcpy(et->et_dest, addr, 6); 1232 memcpy(et->et_src, NetOurEther, 6); 1233 if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) { 1234 et->et_protlen = htons(prot); 1235 return ETHER_HDR_SIZE; 1236 } else { 1237 struct vlan_ethernet_hdr *vet = 1238 (struct vlan_ethernet_hdr *)xet; 1239 1240 vet->vet_vlan_type = htons(PROT_VLAN); 1241 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK)); 1242 vet->vet_type = htons(prot); 1243 return VLAN_ETHER_HDR_SIZE; 1244 } 1245 } 1246 1247 void net_set_ip_header(uchar *pkt, IPaddr_t dest, IPaddr_t source) 1248 { 1249 struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt; 1250 1251 /* 1252 * Construct an IP header. 1253 */ 1254 /* IP_HDR_SIZE / 4 (not including UDP) */ 1255 ip->ip_hl_v = 0x45; 1256 ip->ip_tos = 0; 1257 ip->ip_len = htons(IP_HDR_SIZE); 1258 ip->ip_id = htons(NetIPID++); 1259 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ 1260 ip->ip_ttl = 255; 1261 ip->ip_sum = 0; 1262 /* already in network byte order */ 1263 NetCopyIP((void *)&ip->ip_src, &source); 1264 /* already in network byte order */ 1265 NetCopyIP((void *)&ip->ip_dst, &dest); 1266 } 1267 1268 void net_set_udp_header(uchar *pkt, IPaddr_t dest, int dport, int sport, 1269 int len) 1270 { 1271 struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt; 1272 1273 /* 1274 * If the data is an odd number of bytes, zero the 1275 * byte after the last byte so that the checksum 1276 * will work. 1277 */ 1278 if (len & 1) 1279 pkt[IP_UDP_HDR_SIZE + len] = 0; 1280 1281 net_set_ip_header(pkt, dest, NetOurIP); 1282 ip->ip_len = htons(IP_UDP_HDR_SIZE + len); 1283 ip->ip_p = IPPROTO_UDP; 1284 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE >> 1); 1285 1286 ip->udp_src = htons(sport); 1287 ip->udp_dst = htons(dport); 1288 ip->udp_len = htons(UDP_HDR_SIZE + len); 1289 ip->udp_xsum = 0; 1290 } 1291 1292 void copy_filename(char *dst, const char *src, int size) 1293 { 1294 if (*src && (*src == '"')) { 1295 ++src; 1296 --size; 1297 } 1298 1299 while ((--size > 0) && *src && (*src != '"')) 1300 *dst++ = *src++; 1301 *dst = '\0'; 1302 } 1303 1304 #if defined(CONFIG_CMD_NFS) || \ 1305 defined(CONFIG_CMD_SNTP) || \ 1306 defined(CONFIG_CMD_DNS) 1307 /* 1308 * make port a little random (1024-17407) 1309 * This keeps the math somewhat trivial to compute, and seems to work with 1310 * all supported protocols/clients/servers 1311 */ 1312 unsigned int random_port(void) 1313 { 1314 return 1024 + (get_timer(0) % 0x4000); 1315 } 1316 #endif 1317 1318 void ip_to_string(IPaddr_t x, char *s) 1319 { 1320 x = ntohl(x); 1321 sprintf(s, "%d.%d.%d.%d", 1322 (int) ((x >> 24) & 0xff), 1323 (int) ((x >> 16) & 0xff), 1324 (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff) 1325 ); 1326 } 1327 1328 void VLAN_to_string(ushort x, char *s) 1329 { 1330 x = ntohs(x); 1331 1332 if (x == (ushort)-1) 1333 x = VLAN_NONE; 1334 1335 if (x == VLAN_NONE) 1336 strcpy(s, "none"); 1337 else 1338 sprintf(s, "%d", x & VLAN_IDMASK); 1339 } 1340 1341 ushort string_to_VLAN(const char *s) 1342 { 1343 ushort id; 1344 1345 if (s == NULL) 1346 return htons(VLAN_NONE); 1347 1348 if (*s < '0' || *s > '9') 1349 id = VLAN_NONE; 1350 else 1351 id = (ushort)simple_strtoul(s, NULL, 10); 1352 1353 return htons(id); 1354 } 1355 1356 ushort getenv_VLAN(char *var) 1357 { 1358 return string_to_VLAN(getenv(var)); 1359 } 1360