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