1 /* 2 * LiMon Monitor (LiMon) - Network. 3 * 4 * Copyright 1994 - 2000 Neil Russell. 5 * (See License) 6 * 7 * 8 * History 9 * 9/16/00 bor adapted to TQM823L/STK8xxL board, RARP/TFTP boot added 10 */ 11 12 #ifndef __NET_H__ 13 #define __NET_H__ 14 15 #if defined(CONFIG_8xx) 16 #include <commproc.h> 17 #endif /* CONFIG_8xx */ 18 19 #include <asm/cache.h> 20 #include <asm/byteorder.h> /* for nton* / ntoh* stuff */ 21 22 #define DEBUG_LL_STATE 0 /* Link local state machine changes */ 23 #define DEBUG_DEV_PKT 0 /* Packets or info directed to the device */ 24 #define DEBUG_NET_PKT 0 /* Packets on info on the network at large */ 25 #define DEBUG_INT_STATE 0 /* Internal network state changes */ 26 27 /* 28 * The number of receive packet buffers, and the required packet buffer 29 * alignment in memory. 30 * 31 */ 32 33 #ifdef CONFIG_SYS_RX_ETH_BUFFER 34 # define PKTBUFSRX CONFIG_SYS_RX_ETH_BUFFER 35 #else 36 # define PKTBUFSRX 4 37 #endif 38 39 #define PKTALIGN ARCH_DMA_MINALIGN 40 41 /* IPv4 addresses are always 32 bits in size */ 42 typedef u32 IPaddr_t; 43 44 45 /** 46 * An incoming packet handler. 47 * @param pkt pointer to the application packet 48 * @param dport destination UDP port 49 * @param sip source IP address 50 * @param sport source UDP port 51 * @param len packet length 52 */ 53 typedef void rxhand_f(uchar *pkt, unsigned dport, 54 IPaddr_t sip, unsigned sport, 55 unsigned len); 56 57 /** 58 * An incoming ICMP packet handler. 59 * @param type ICMP type 60 * @param code ICMP code 61 * @param dport destination UDP port 62 * @param sip source IP address 63 * @param sport source UDP port 64 * @param pkt pointer to the ICMP packet data 65 * @param len packet length 66 */ 67 typedef void rxhand_icmp_f(unsigned type, unsigned code, unsigned dport, 68 IPaddr_t sip, unsigned sport, uchar *pkt, unsigned len); 69 70 /* 71 * A timeout handler. Called after time interval has expired. 72 */ 73 typedef void thand_f(void); 74 75 enum eth_state_t { 76 ETH_STATE_INIT, 77 ETH_STATE_PASSIVE, 78 ETH_STATE_ACTIVE 79 }; 80 81 struct eth_device { 82 char name[16]; 83 unsigned char enetaddr[6]; 84 int iobase; 85 int state; 86 87 int (*init) (struct eth_device *, bd_t *); 88 int (*send) (struct eth_device *, void *packet, int length); 89 int (*recv) (struct eth_device *); 90 void (*halt) (struct eth_device *); 91 #ifdef CONFIG_MCAST_TFTP 92 int (*mcast) (struct eth_device *, u32 ip, u8 set); 93 #endif 94 int (*write_hwaddr) (struct eth_device *); 95 struct eth_device *next; 96 int index; 97 void *priv; 98 }; 99 100 extern int eth_initialize(bd_t *bis); /* Initialize network subsystem */ 101 extern int eth_register(struct eth_device* dev);/* Register network device */ 102 extern int eth_unregister(struct eth_device *dev);/* Remove network device */ 103 extern void eth_try_another(int first_restart); /* Change the device */ 104 extern void eth_set_current(void); /* set nterface to ethcur var */ 105 extern struct eth_device *eth_get_dev(void); /* get the current device MAC */ 106 extern struct eth_device *eth_get_dev_by_name(const char *devname); 107 extern struct eth_device *eth_get_dev_by_index(int index); /* get dev @ index */ 108 extern int eth_get_dev_index(void); /* get the device index */ 109 extern void eth_parse_enetaddr(const char *addr, uchar *enetaddr); 110 extern int eth_getenv_enetaddr(char *name, uchar *enetaddr); 111 extern int eth_setenv_enetaddr(char *name, const uchar *enetaddr); 112 113 /* 114 * Get the hardware address for an ethernet interface . 115 * Args: 116 * base_name - base name for device (normally "eth") 117 * index - device index number (0 for first) 118 * enetaddr - returns 6 byte hardware address 119 * Returns: 120 * Return true if the address is valid. 121 */ 122 extern int eth_getenv_enetaddr_by_index(const char *base_name, int index, 123 uchar *enetaddr); 124 125 #ifdef CONFIG_RANDOM_MACADDR 126 /* 127 * The u-boot policy does not allow hardcoded ethernet addresses. Under the 128 * following circumstances a random generated address is allowed: 129 * - in emergency cases, where you need a working network connection to set 130 * the ethernet address. 131 * Eg. you want a rescue boot and don't have a serial port to access the 132 * CLI to set environment variables. 133 * 134 * In these cases, we generate a random locally administered ethernet address. 135 * 136 * Args: 137 * enetaddr - returns 6 byte hardware address 138 */ 139 extern void eth_random_enetaddr(uchar *enetaddr); 140 #endif 141 142 extern int usb_eth_initialize(bd_t *bi); 143 extern int eth_init(bd_t *bis); /* Initialize the device */ 144 extern int eth_send(void *packet, int length); /* Send a packet */ 145 146 #ifdef CONFIG_API 147 extern int eth_receive(void *packet, int length); /* Receive a packet*/ 148 extern void (*push_packet)(void *packet, int length); 149 #endif 150 extern int eth_rx(void); /* Check for received packets */ 151 extern void eth_halt(void); /* stop SCC */ 152 extern char *eth_get_name(void); /* get name of current device */ 153 154 /* 155 * Set the hardware address for an ethernet interface based on 'eth%daddr' 156 * environment variable (or just 'ethaddr' if eth_number is 0). 157 * Args: 158 * base_name - base name for device (normally "eth") 159 * eth_number - value of %d (0 for first device of this type) 160 * Returns: 161 * 0 is success, non-zero is error status from driver. 162 */ 163 int eth_write_hwaddr(struct eth_device *dev, const char *base_name, 164 int eth_number); 165 166 #ifdef CONFIG_MCAST_TFTP 167 int eth_mcast_join(IPaddr_t mcast_addr, u8 join); 168 u32 ether_crc(size_t len, unsigned char const *p); 169 #endif 170 171 172 /**********************************************************************/ 173 /* 174 * Protocol headers. 175 */ 176 177 /* 178 * Ethernet header 179 */ 180 181 struct ethernet_hdr { 182 uchar et_dest[6]; /* Destination node */ 183 uchar et_src[6]; /* Source node */ 184 ushort et_protlen; /* Protocol or length */ 185 }; 186 187 /* Ethernet header size */ 188 #define ETHER_HDR_SIZE (sizeof(struct ethernet_hdr)) 189 190 struct e802_hdr { 191 uchar et_dest[6]; /* Destination node */ 192 uchar et_src[6]; /* Source node */ 193 ushort et_protlen; /* Protocol or length */ 194 uchar et_dsap; /* 802 DSAP */ 195 uchar et_ssap; /* 802 SSAP */ 196 uchar et_ctl; /* 802 control */ 197 uchar et_snap1; /* SNAP */ 198 uchar et_snap2; 199 uchar et_snap3; 200 ushort et_prot; /* 802 protocol */ 201 }; 202 203 /* 802 + SNAP + ethernet header size */ 204 #define E802_HDR_SIZE (sizeof(struct e802_hdr)) 205 206 /* 207 * Virtual LAN Ethernet header 208 */ 209 struct vlan_ethernet_hdr { 210 uchar vet_dest[6]; /* Destination node */ 211 uchar vet_src[6]; /* Source node */ 212 ushort vet_vlan_type; /* PROT_VLAN */ 213 ushort vet_tag; /* TAG of VLAN */ 214 ushort vet_type; /* protocol type */ 215 }; 216 217 /* VLAN Ethernet header size */ 218 #define VLAN_ETHER_HDR_SIZE (sizeof(struct vlan_ethernet_hdr)) 219 220 #define PROT_IP 0x0800 /* IP protocol */ 221 #define PROT_ARP 0x0806 /* IP ARP protocol */ 222 #define PROT_RARP 0x8035 /* IP ARP protocol */ 223 #define PROT_VLAN 0x8100 /* IEEE 802.1q protocol */ 224 225 #define IPPROTO_ICMP 1 /* Internet Control Message Protocol */ 226 #define IPPROTO_UDP 17 /* User Datagram Protocol */ 227 228 /* 229 * Internet Protocol (IP) header. 230 */ 231 struct ip_hdr { 232 uchar ip_hl_v; /* header length and version */ 233 uchar ip_tos; /* type of service */ 234 ushort ip_len; /* total length */ 235 ushort ip_id; /* identification */ 236 ushort ip_off; /* fragment offset field */ 237 uchar ip_ttl; /* time to live */ 238 uchar ip_p; /* protocol */ 239 ushort ip_sum; /* checksum */ 240 IPaddr_t ip_src; /* Source IP address */ 241 IPaddr_t ip_dst; /* Destination IP address */ 242 }; 243 244 #define IP_OFFS 0x1fff /* ip offset *= 8 */ 245 #define IP_FLAGS 0xe000 /* first 3 bits */ 246 #define IP_FLAGS_RES 0x8000 /* reserved */ 247 #define IP_FLAGS_DFRAG 0x4000 /* don't fragments */ 248 #define IP_FLAGS_MFRAG 0x2000 /* more fragments */ 249 250 #define IP_HDR_SIZE (sizeof(struct ip_hdr)) 251 252 /* 253 * Internet Protocol (IP) + UDP header. 254 */ 255 struct ip_udp_hdr { 256 uchar ip_hl_v; /* header length and version */ 257 uchar ip_tos; /* type of service */ 258 ushort ip_len; /* total length */ 259 ushort ip_id; /* identification */ 260 ushort ip_off; /* fragment offset field */ 261 uchar ip_ttl; /* time to live */ 262 uchar ip_p; /* protocol */ 263 ushort ip_sum; /* checksum */ 264 IPaddr_t ip_src; /* Source IP address */ 265 IPaddr_t ip_dst; /* Destination IP address */ 266 ushort udp_src; /* UDP source port */ 267 ushort udp_dst; /* UDP destination port */ 268 ushort udp_len; /* Length of UDP packet */ 269 ushort udp_xsum; /* Checksum */ 270 }; 271 272 #define IP_UDP_HDR_SIZE (sizeof(struct ip_udp_hdr)) 273 #define UDP_HDR_SIZE (IP_UDP_HDR_SIZE - IP_HDR_SIZE) 274 275 /* 276 * Address Resolution Protocol (ARP) header. 277 */ 278 struct arp_hdr { 279 ushort ar_hrd; /* Format of hardware address */ 280 # define ARP_ETHER 1 /* Ethernet hardware address */ 281 ushort ar_pro; /* Format of protocol address */ 282 uchar ar_hln; /* Length of hardware address */ 283 # define ARP_HLEN 6 284 uchar ar_pln; /* Length of protocol address */ 285 # define ARP_PLEN 4 286 ushort ar_op; /* Operation */ 287 # define ARPOP_REQUEST 1 /* Request to resolve address */ 288 # define ARPOP_REPLY 2 /* Response to previous request */ 289 290 # define RARPOP_REQUEST 3 /* Request to resolve address */ 291 # define RARPOP_REPLY 4 /* Response to previous request */ 292 293 /* 294 * The remaining fields are variable in size, according to 295 * the sizes above, and are defined as appropriate for 296 * specific hardware/protocol combinations. 297 */ 298 uchar ar_data[0]; 299 #define ar_sha ar_data[0] 300 #define ar_spa ar_data[ARP_HLEN] 301 #define ar_tha ar_data[ARP_HLEN + ARP_PLEN] 302 #define ar_tpa ar_data[ARP_HLEN + ARP_PLEN + ARP_HLEN] 303 #if 0 304 uchar ar_sha[]; /* Sender hardware address */ 305 uchar ar_spa[]; /* Sender protocol address */ 306 uchar ar_tha[]; /* Target hardware address */ 307 uchar ar_tpa[]; /* Target protocol address */ 308 #endif /* 0 */ 309 }; 310 311 #define ARP_HDR_SIZE (8+20) /* Size assuming ethernet */ 312 313 /* 314 * ICMP stuff (just enough to handle (host) redirect messages) 315 */ 316 #define ICMP_ECHO_REPLY 0 /* Echo reply */ 317 #define ICMP_NOT_REACH 3 /* Detination unreachable */ 318 #define ICMP_REDIRECT 5 /* Redirect (change route) */ 319 #define ICMP_ECHO_REQUEST 8 /* Echo request */ 320 321 /* Codes for REDIRECT. */ 322 #define ICMP_REDIR_NET 0 /* Redirect Net */ 323 #define ICMP_REDIR_HOST 1 /* Redirect Host */ 324 325 /* Codes for NOT_REACH */ 326 #define ICMP_NOT_REACH_PORT 3 /* Port unreachable */ 327 328 struct icmp_hdr { 329 uchar type; 330 uchar code; 331 ushort checksum; 332 union { 333 struct { 334 ushort id; 335 ushort sequence; 336 } echo; 337 ulong gateway; 338 struct { 339 ushort __unused; 340 ushort mtu; 341 } frag; 342 uchar data[0]; 343 } un; 344 }; 345 346 #define ICMP_HDR_SIZE (sizeof(struct icmp_hdr)) 347 #define IP_ICMP_HDR_SIZE (IP_HDR_SIZE + ICMP_HDR_SIZE) 348 349 /* 350 * Maximum packet size; used to allocate packet storage. 351 * TFTP packets can be 524 bytes + IP header + ethernet header. 352 * Lets be conservative, and go for 38 * 16. (Must also be 353 * a multiple of 32 bytes). 354 */ 355 /* 356 * AS.HARNOIS : Better to set PKTSIZE to maximum size because 357 * traffic type is not always controlled 358 * maximum packet size = 1518 359 * maximum packet size and multiple of 32 bytes = 1536 360 */ 361 #define PKTSIZE 1518 362 #define PKTSIZE_ALIGN 1536 363 /*#define PKTSIZE 608*/ 364 365 /* 366 * Maximum receive ring size; that is, the number of packets 367 * we can buffer before overflow happens. Basically, this just 368 * needs to be enough to prevent a packet being discarded while 369 * we are processing the previous one. 370 */ 371 #define RINGSZ 4 372 #define RINGSZ_LOG2 2 373 374 /**********************************************************************/ 375 /* 376 * Globals. 377 * 378 * Note: 379 * 380 * All variables of type IPaddr_t are stored in NETWORK byte order 381 * (big endian). 382 */ 383 384 /* net.c */ 385 /** BOOTP EXTENTIONS **/ 386 extern IPaddr_t NetOurGatewayIP; /* Our gateway IP address */ 387 extern IPaddr_t NetOurSubnetMask; /* Our subnet mask (0 = unknown) */ 388 extern IPaddr_t NetOurDNSIP; /* Our Domain Name Server (0 = unknown) */ 389 #if defined(CONFIG_BOOTP_DNS2) 390 extern IPaddr_t NetOurDNS2IP; /* Our 2nd Domain Name Server (0 = unknown) */ 391 #endif 392 extern char NetOurNISDomain[32]; /* Our NIS domain */ 393 extern char NetOurHostName[32]; /* Our hostname */ 394 extern char NetOurRootPath[64]; /* Our root path */ 395 extern ushort NetBootFileSize; /* Our boot file size in blocks */ 396 /** END OF BOOTP EXTENTIONS **/ 397 extern ulong NetBootFileXferSize; /* size of bootfile in bytes */ 398 extern uchar NetOurEther[6]; /* Our ethernet address */ 399 extern uchar NetServerEther[6]; /* Boot server enet address */ 400 extern IPaddr_t NetOurIP; /* Our IP addr (0 = unknown) */ 401 extern IPaddr_t NetServerIP; /* Server IP addr (0 = unknown) */ 402 extern uchar *NetTxPacket; /* THE transmit packet */ 403 extern uchar *NetRxPackets[PKTBUFSRX]; /* Receive packets */ 404 extern uchar *NetRxPacket; /* Current receive packet */ 405 extern int NetRxPacketLen; /* Current rx packet length */ 406 extern unsigned NetIPID; /* IP ID (counting) */ 407 extern uchar NetBcastAddr[6]; /* Ethernet boardcast address */ 408 extern uchar NetEtherNullAddr[6]; 409 410 #define VLAN_NONE 4095 /* untagged */ 411 #define VLAN_IDMASK 0x0fff /* mask of valid vlan id */ 412 extern ushort NetOurVLAN; /* Our VLAN */ 413 extern ushort NetOurNativeVLAN; /* Our Native VLAN */ 414 415 extern int NetRestartWrap; /* Tried all network devices */ 416 417 enum proto_t { 418 BOOTP, RARP, ARP, TFTPGET, DHCP, PING, DNS, NFS, CDP, NETCONS, SNTP, 419 TFTPSRV, TFTPPUT, LINKLOCAL 420 }; 421 422 /* from net/net.c */ 423 extern char BootFile[128]; /* Boot File name */ 424 425 #if defined(CONFIG_CMD_DNS) 426 extern char *NetDNSResolve; /* The host to resolve */ 427 extern char *NetDNSenvvar; /* the env var to put the ip into */ 428 #endif 429 430 #if defined(CONFIG_CMD_PING) 431 extern IPaddr_t NetPingIP; /* the ip address to ping */ 432 #endif 433 434 #if defined(CONFIG_CMD_CDP) 435 /* when CDP completes these hold the return values */ 436 extern ushort CDPNativeVLAN; /* CDP returned native VLAN */ 437 extern ushort CDPApplianceVLAN; /* CDP returned appliance VLAN */ 438 439 /* 440 * Check for a CDP packet by examining the received MAC address field 441 */ 442 static inline int is_cdp_packet(const uchar *et_addr) 443 { 444 extern const uchar NetCDPAddr[6]; 445 446 return memcmp(et_addr, NetCDPAddr, 6) == 0; 447 } 448 #endif 449 450 #if defined(CONFIG_CMD_SNTP) 451 extern IPaddr_t NetNtpServerIP; /* the ip address to NTP */ 452 extern int NetTimeOffset; /* offset time from UTC */ 453 #endif 454 455 #if defined(CONFIG_MCAST_TFTP) 456 extern IPaddr_t Mcast_addr; 457 #endif 458 459 /* Initialize the network adapter */ 460 extern void net_init(void); 461 extern int NetLoop(enum proto_t); 462 463 /* Shutdown adapters and cleanup */ 464 extern void NetStop(void); 465 466 /* Load failed. Start again. */ 467 extern void NetStartAgain(void); 468 469 /* Get size of the ethernet header when we send */ 470 extern int NetEthHdrSize(void); 471 472 /* Set ethernet header; returns the size of the header */ 473 extern int NetSetEther(uchar *, uchar *, uint); 474 extern int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot); 475 476 /* Set IP header */ 477 extern void net_set_ip_header(uchar *pkt, IPaddr_t dest, IPaddr_t source); 478 extern void net_set_udp_header(uchar *pkt, IPaddr_t dest, int dport, 479 int sport, int len); 480 481 /* Checksum */ 482 extern int NetCksumOk(uchar *, int); /* Return true if cksum OK */ 483 extern uint NetCksum(uchar *, int); /* Calculate the checksum */ 484 485 /* Callbacks */ 486 extern rxhand_f *net_get_udp_handler(void); /* Get UDP RX packet handler */ 487 extern void net_set_udp_handler(rxhand_f *); /* Set UDP RX packet handler */ 488 extern rxhand_f *net_get_arp_handler(void); /* Get ARP RX packet handler */ 489 extern void net_set_arp_handler(rxhand_f *); /* Set ARP RX packet handler */ 490 extern void net_set_icmp_handler(rxhand_icmp_f *f); /* Set ICMP RX handler */ 491 extern void NetSetTimeout(ulong, thand_f *);/* Set timeout handler */ 492 493 /* Network loop state */ 494 enum net_loop_state { 495 NETLOOP_CONTINUE, 496 NETLOOP_RESTART, 497 NETLOOP_SUCCESS, 498 NETLOOP_FAIL 499 }; 500 static inline void net_set_state(enum net_loop_state state) 501 { 502 extern enum net_loop_state net_state; 503 504 debug_cond(DEBUG_INT_STATE, "--- NetState set to %d\n", state); 505 net_state = state; 506 } 507 508 /* Transmit a packet */ 509 static inline void NetSendPacket(uchar *pkt, int len) 510 { 511 (void) eth_send(pkt, len); 512 } 513 514 /* 515 * Transmit "NetTxPacket" as UDP packet, performing ARP request if needed 516 * (ether will be populated) 517 * 518 * @param ether Raw packet buffer 519 * @param dest IP address to send the datagram to 520 * @param dport Destination UDP port 521 * @param sport Source UDP port 522 * @param payload_len Length of data after the UDP header 523 */ 524 extern int NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, 525 int sport, int payload_len); 526 527 /* Processes a received packet */ 528 extern void NetReceive(uchar *, int); 529 530 #ifdef CONFIG_NETCONSOLE 531 void NcStart(void); 532 int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len); 533 #endif 534 535 /* 536 * Check if autoload is enabled. If so, use either NFS or TFTP to download 537 * the boot file. 538 */ 539 void net_auto_load(void); 540 541 /* 542 * The following functions are a bit ugly, but necessary to deal with 543 * alignment restrictions on ARM. 544 * 545 * We're using inline functions, which had the smallest memory 546 * footprint in our tests. 547 */ 548 /* return IP *in network byteorder* */ 549 static inline IPaddr_t NetReadIP(void *from) 550 { 551 IPaddr_t ip; 552 553 memcpy((void *)&ip, (void *)from, sizeof(ip)); 554 return ip; 555 } 556 557 /* return ulong *in network byteorder* */ 558 static inline ulong NetReadLong(ulong *from) 559 { 560 ulong l; 561 562 memcpy((void *)&l, (void *)from, sizeof(l)); 563 return l; 564 } 565 566 /* write IP *in network byteorder* */ 567 static inline void NetWriteIP(void *to, IPaddr_t ip) 568 { 569 memcpy(to, (void *)&ip, sizeof(ip)); 570 } 571 572 /* copy IP */ 573 static inline void NetCopyIP(void *to, void *from) 574 { 575 memcpy((void *)to, from, sizeof(IPaddr_t)); 576 } 577 578 /* copy ulong */ 579 static inline void NetCopyLong(ulong *to, ulong *from) 580 { 581 memcpy((void *)to, (void *)from, sizeof(ulong)); 582 } 583 584 /** 585 * is_zero_ether_addr - Determine if give Ethernet address is all zeros. 586 * @addr: Pointer to a six-byte array containing the Ethernet address 587 * 588 * Return true if the address is all zeroes. 589 */ 590 static inline int is_zero_ether_addr(const u8 *addr) 591 { 592 return !(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]); 593 } 594 595 /** 596 * is_multicast_ether_addr - Determine if the Ethernet address is a multicast. 597 * @addr: Pointer to a six-byte array containing the Ethernet address 598 * 599 * Return true if the address is a multicast address. 600 * By definition the broadcast address is also a multicast address. 601 */ 602 static inline int is_multicast_ether_addr(const u8 *addr) 603 { 604 return 0x01 & addr[0]; 605 } 606 607 /* 608 * is_broadcast_ether_addr - Determine if the Ethernet address is broadcast 609 * @addr: Pointer to a six-byte array containing the Ethernet address 610 * 611 * Return true if the address is the broadcast address. 612 */ 613 static inline int is_broadcast_ether_addr(const u8 *addr) 614 { 615 return (addr[0] & addr[1] & addr[2] & addr[3] & addr[4] & addr[5]) == 616 0xff; 617 } 618 619 /* 620 * is_valid_ether_addr - Determine if the given Ethernet address is valid 621 * @addr: Pointer to a six-byte array containing the Ethernet address 622 * 623 * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not 624 * a multicast address, and is not FF:FF:FF:FF:FF:FF. 625 * 626 * Return true if the address is valid. 627 */ 628 static inline int is_valid_ether_addr(const u8 *addr) 629 { 630 /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to 631 * explicitly check for it here. */ 632 return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr); 633 } 634 635 /* Convert an IP address to a string */ 636 extern void ip_to_string(IPaddr_t x, char *s); 637 638 /* Convert a string to ip address */ 639 extern IPaddr_t string_to_ip(const char *s); 640 641 /* Convert a VLAN id to a string */ 642 extern void VLAN_to_string(ushort x, char *s); 643 644 /* Convert a string to a vlan id */ 645 extern ushort string_to_VLAN(const char *s); 646 647 /* read a VLAN id from an environment variable */ 648 extern ushort getenv_VLAN(char *); 649 650 /* copy a filename (allow for "..." notation, limit length) */ 651 extern void copy_filename(char *dst, const char *src, int size); 652 653 /* get a random source port */ 654 extern unsigned int random_port(void); 655 656 /**********************************************************************/ 657 658 #endif /* __NET_H__ */ 659