2 * LiMon Monitor (LiMon) - Network.
4 * Copyright 1994 - 2000 Neil Russell.
6 * SPDX-License-Identifier: GPL-2.0
9 * 9/16/00 bor adapted to TQM823L/STK8xxL board, RARP/TFTP boot added
15 #if defined(CONFIG_8xx)
17 #endif /* CONFIG_8xx */
19 #include <asm/cache.h>
20 #include <asm/byteorder.h> /* for nton* / ntoh* stuff */
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 */
28 * The number of receive packet buffers, and the required packet buffer
29 * alignment in memory.
33 #ifdef CONFIG_SYS_RX_ETH_BUFFER
34 # define PKTBUFSRX CONFIG_SYS_RX_ETH_BUFFER
39 #define PKTALIGN ARCH_DMA_MINALIGN
41 /* IPv4 addresses are always 32 bits in size */
42 typedef __be32 IPaddr_t;
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
53 typedef void rxhand_f(uchar *pkt, unsigned dport,
54 IPaddr_t sip, unsigned sport,
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
67 typedef void rxhand_icmp_f(unsigned type, unsigned code, unsigned dport,
68 IPaddr_t sip, unsigned sport, uchar *pkt, unsigned len);
71 * A timeout handler. Called after time interval has expired.
73 typedef void thand_f(void);
83 * struct eth_pdata - Platform data for Ethernet MAC controllers
85 * @iobase: The base address of the hardware registers
86 * @enetaddr: The Ethernet MAC address that is loaded from EEPROM or env
90 unsigned char enetaddr[6];
94 * struct eth_ops - functions of Ethernet MAC controllers
96 * start: Prepare the hardware to send and receive packets
97 * send: Send the bytes passed in "packet" as a packet on the wire
98 * recv: Check if the hardware received a packet. If so, set the pointer to the
99 * packet buffer in the packetp parameter. If not, return an error or 0 to
100 * indicate that the hardware receive FIFO is empty
101 * stop: Stop the hardware from looking for packets - may be called even if
103 * mcast: Join or leave a multicast group (for TFTP) - optional
104 * write_hwaddr: Write a MAC address to the hardware (used to pass it to Linux
105 * on some platforms like ARM). This function expects the
106 * eth_pdata::enetaddr field to be populated - optional
107 * read_rom_hwaddr: Some devices have a backup of the MAC address stored in a
108 * ROM on the board. This is how the driver should expose it
109 * to the network stack. This function should fill in the
110 * eth_pdata::enetaddr field - optional
113 int (*start)(struct udevice *dev);
114 int (*send)(struct udevice *dev, void *packet, int length);
115 int (*recv)(struct udevice *dev, uchar **packetp);
116 void (*stop)(struct udevice *dev);
117 #ifdef CONFIG_MCAST_TFTP
118 int (*mcast)(struct udevice *dev, const u8 *enetaddr, int join);
120 int (*write_hwaddr)(struct udevice *dev);
121 int (*read_rom_hwaddr)(struct udevice *dev);
124 #define eth_get_ops(dev) ((struct eth_ops *)(dev)->driver->ops)
126 struct udevice *eth_get_dev(void); /* get the current device */
127 unsigned char *eth_get_ethaddr(void); /* get the current device MAC */
128 /* Used only when NetConsole is enabled */
129 int eth_init_state_only(void); /* Set active state */
130 void eth_halt_state_only(void); /* Set passive state */
133 #ifndef CONFIG_DM_ETH
136 unsigned char enetaddr[6];
140 int (*init) (struct eth_device *, bd_t *);
141 int (*send) (struct eth_device *, void *packet, int length);
142 int (*recv) (struct eth_device *);
143 void (*halt) (struct eth_device *);
144 #ifdef CONFIG_MCAST_TFTP
145 int (*mcast) (struct eth_device *, const u8 *enetaddr, u8 set);
147 int (*write_hwaddr) (struct eth_device *);
148 struct eth_device *next;
153 int eth_register(struct eth_device *dev);/* Register network device */
154 int eth_unregister(struct eth_device *dev);/* Remove network device */
156 extern struct eth_device *eth_current;
158 static inline __attribute__((always_inline))
159 struct eth_device *eth_get_dev(void)
163 struct eth_device *eth_get_dev_by_name(const char *devname);
164 struct eth_device *eth_get_dev_by_index(int index); /* get dev @ index */
166 /* get the current device MAC */
167 static inline unsigned char *eth_get_ethaddr(void)
170 return eth_current->enetaddr;
174 /* Set active state */
175 static inline __attribute__((always_inline)) int eth_init_state_only(void)
177 eth_get_dev()->state = ETH_STATE_ACTIVE;
181 /* Set passive state */
182 static inline __attribute__((always_inline)) void eth_halt_state_only(void)
184 eth_get_dev()->state = ETH_STATE_PASSIVE;
188 * Set the hardware address for an ethernet interface based on 'eth%daddr'
189 * environment variable (or just 'ethaddr' if eth_number is 0).
191 * base_name - base name for device (normally "eth")
192 * eth_number - value of %d (0 for first device of this type)
194 * 0 is success, non-zero is error status from driver.
196 int eth_write_hwaddr(struct eth_device *dev, const char *base_name,
199 int usb_eth_initialize(bd_t *bi);
202 int eth_initialize(void); /* Initialize network subsystem */
203 void eth_try_another(int first_restart); /* Change the device */
204 void eth_set_current(void); /* set nterface to ethcur var */
206 int eth_get_dev_index(void); /* get the device index */
207 void eth_parse_enetaddr(const char *addr, uchar *enetaddr);
208 int eth_getenv_enetaddr(char *name, uchar *enetaddr);
209 int eth_setenv_enetaddr(char *name, const uchar *enetaddr);
212 * Get the hardware address for an ethernet interface .
214 * base_name - base name for device (normally "eth")
215 * index - device index number (0 for first)
216 * enetaddr - returns 6 byte hardware address
218 * Return true if the address is valid.
220 int eth_getenv_enetaddr_by_index(const char *base_name, int index,
223 int eth_init(void); /* Initialize the device */
224 int eth_send(void *packet, int length); /* Send a packet */
227 int eth_receive(void *packet, int length); /* Receive a packet*/
228 extern void (*push_packet)(void *packet, int length);
230 int eth_rx(void); /* Check for received packets */
231 void eth_halt(void); /* stop SCC */
232 const char *eth_get_name(void); /* get name of current device */
234 #ifdef CONFIG_MCAST_TFTP
235 int eth_mcast_join(IPaddr_t mcast_addr, int join);
236 u32 ether_crc(size_t len, unsigned char const *p);
240 /**********************************************************************/
249 struct ethernet_hdr {
250 uchar et_dest[6]; /* Destination node */
251 uchar et_src[6]; /* Source node */
252 ushort et_protlen; /* Protocol or length */
255 /* Ethernet header size */
256 #define ETHER_HDR_SIZE (sizeof(struct ethernet_hdr))
258 #define ETH_FCS_LEN 4 /* Octets in the FCS */
261 uchar et_dest[6]; /* Destination node */
262 uchar et_src[6]; /* Source node */
263 ushort et_protlen; /* Protocol or length */
264 uchar et_dsap; /* 802 DSAP */
265 uchar et_ssap; /* 802 SSAP */
266 uchar et_ctl; /* 802 control */
267 uchar et_snap1; /* SNAP */
270 ushort et_prot; /* 802 protocol */
273 /* 802 + SNAP + ethernet header size */
274 #define E802_HDR_SIZE (sizeof(struct e802_hdr))
277 * Virtual LAN Ethernet header
279 struct vlan_ethernet_hdr {
280 uchar vet_dest[6]; /* Destination node */
281 uchar vet_src[6]; /* Source node */
282 ushort vet_vlan_type; /* PROT_VLAN */
283 ushort vet_tag; /* TAG of VLAN */
284 ushort vet_type; /* protocol type */
287 /* VLAN Ethernet header size */
288 #define VLAN_ETHER_HDR_SIZE (sizeof(struct vlan_ethernet_hdr))
290 #define PROT_IP 0x0800 /* IP protocol */
291 #define PROT_ARP 0x0806 /* IP ARP protocol */
292 #define PROT_RARP 0x8035 /* IP ARP protocol */
293 #define PROT_VLAN 0x8100 /* IEEE 802.1q protocol */
295 #define IPPROTO_ICMP 1 /* Internet Control Message Protocol */
296 #define IPPROTO_UDP 17 /* User Datagram Protocol */
299 * Internet Protocol (IP) header.
302 uchar ip_hl_v; /* header length and version */
303 uchar ip_tos; /* type of service */
304 ushort ip_len; /* total length */
305 ushort ip_id; /* identification */
306 ushort ip_off; /* fragment offset field */
307 uchar ip_ttl; /* time to live */
308 uchar ip_p; /* protocol */
309 ushort ip_sum; /* checksum */
310 IPaddr_t ip_src; /* Source IP address */
311 IPaddr_t ip_dst; /* Destination IP address */
314 #define IP_OFFS 0x1fff /* ip offset *= 8 */
315 #define IP_FLAGS 0xe000 /* first 3 bits */
316 #define IP_FLAGS_RES 0x8000 /* reserved */
317 #define IP_FLAGS_DFRAG 0x4000 /* don't fragments */
318 #define IP_FLAGS_MFRAG 0x2000 /* more fragments */
320 #define IP_HDR_SIZE (sizeof(struct ip_hdr))
323 * Internet Protocol (IP) + UDP header.
326 uchar ip_hl_v; /* header length and version */
327 uchar ip_tos; /* type of service */
328 ushort ip_len; /* total length */
329 ushort ip_id; /* identification */
330 ushort ip_off; /* fragment offset field */
331 uchar ip_ttl; /* time to live */
332 uchar ip_p; /* protocol */
333 ushort ip_sum; /* checksum */
334 IPaddr_t ip_src; /* Source IP address */
335 IPaddr_t ip_dst; /* Destination IP address */
336 ushort udp_src; /* UDP source port */
337 ushort udp_dst; /* UDP destination port */
338 ushort udp_len; /* Length of UDP packet */
339 ushort udp_xsum; /* Checksum */
342 #define IP_UDP_HDR_SIZE (sizeof(struct ip_udp_hdr))
343 #define UDP_HDR_SIZE (IP_UDP_HDR_SIZE - IP_HDR_SIZE)
346 * Address Resolution Protocol (ARP) header.
349 ushort ar_hrd; /* Format of hardware address */
350 # define ARP_ETHER 1 /* Ethernet hardware address */
351 ushort ar_pro; /* Format of protocol address */
352 uchar ar_hln; /* Length of hardware address */
354 uchar ar_pln; /* Length of protocol address */
356 ushort ar_op; /* Operation */
357 # define ARPOP_REQUEST 1 /* Request to resolve address */
358 # define ARPOP_REPLY 2 /* Response to previous request */
360 # define RARPOP_REQUEST 3 /* Request to resolve address */
361 # define RARPOP_REPLY 4 /* Response to previous request */
364 * The remaining fields are variable in size, according to
365 * the sizes above, and are defined as appropriate for
366 * specific hardware/protocol combinations.
369 #define ar_sha ar_data[0]
370 #define ar_spa ar_data[ARP_HLEN]
371 #define ar_tha ar_data[ARP_HLEN + ARP_PLEN]
372 #define ar_tpa ar_data[ARP_HLEN + ARP_PLEN + ARP_HLEN]
374 uchar ar_sha[]; /* Sender hardware address */
375 uchar ar_spa[]; /* Sender protocol address */
376 uchar ar_tha[]; /* Target hardware address */
377 uchar ar_tpa[]; /* Target protocol address */
381 #define ARP_HDR_SIZE (8+20) /* Size assuming ethernet */
384 * ICMP stuff (just enough to handle (host) redirect messages)
386 #define ICMP_ECHO_REPLY 0 /* Echo reply */
387 #define ICMP_NOT_REACH 3 /* Detination unreachable */
388 #define ICMP_REDIRECT 5 /* Redirect (change route) */
389 #define ICMP_ECHO_REQUEST 8 /* Echo request */
391 /* Codes for REDIRECT. */
392 #define ICMP_REDIR_NET 0 /* Redirect Net */
393 #define ICMP_REDIR_HOST 1 /* Redirect Host */
395 /* Codes for NOT_REACH */
396 #define ICMP_NOT_REACH_PORT 3 /* Port unreachable */
416 #define ICMP_HDR_SIZE (sizeof(struct icmp_hdr))
417 #define IP_ICMP_HDR_SIZE (IP_HDR_SIZE + ICMP_HDR_SIZE)
420 * Maximum packet size; used to allocate packet storage.
421 * TFTP packets can be 524 bytes + IP header + ethernet header.
422 * Lets be conservative, and go for 38 * 16. (Must also be
423 * a multiple of 32 bytes).
426 * AS.HARNOIS : Better to set PKTSIZE to maximum size because
427 * traffic type is not always controlled
428 * maximum packet size = 1518
429 * maximum packet size and multiple of 32 bytes = 1536
432 #define PKTSIZE_ALIGN 1536
433 /*#define PKTSIZE 608*/
436 * Maximum receive ring size; that is, the number of packets
437 * we can buffer before overflow happens. Basically, this just
438 * needs to be enough to prevent a packet being discarded while
439 * we are processing the previous one.
442 #define RINGSZ_LOG2 2
444 /**********************************************************************/
450 * All variables of type IPaddr_t are stored in NETWORK byte order
455 /** BOOTP EXTENTIONS **/
456 extern IPaddr_t NetOurGatewayIP; /* Our gateway IP address */
457 extern IPaddr_t NetOurSubnetMask; /* Our subnet mask (0 = unknown) */
458 extern IPaddr_t NetOurDNSIP; /* Our Domain Name Server (0 = unknown) */
459 #if defined(CONFIG_BOOTP_DNS2)
460 extern IPaddr_t NetOurDNS2IP; /* Our 2nd Domain Name Server (0 = unknown) */
462 extern char NetOurNISDomain[32]; /* Our NIS domain */
463 extern char NetOurHostName[32]; /* Our hostname */
464 extern char NetOurRootPath[64]; /* Our root path */
465 extern ushort NetBootFileSize; /* Our boot file size in blocks */
466 /** END OF BOOTP EXTENTIONS **/
467 extern ulong NetBootFileXferSize; /* size of bootfile in bytes */
468 extern uchar NetOurEther[6]; /* Our ethernet address */
469 extern uchar NetServerEther[6]; /* Boot server enet address */
470 extern IPaddr_t NetOurIP; /* Our IP addr (0 = unknown) */
471 extern IPaddr_t NetServerIP; /* Server IP addr (0 = unknown) */
472 extern uchar *NetTxPacket; /* THE transmit packet */
474 extern uchar *net_rx_packets[PKTBUFSRX]; /* Receive packets */
476 extern uchar *NetRxPackets[PKTBUFSRX]; /* Receive packets */
478 extern uchar *NetRxPacket; /* Current receive packet */
479 extern int NetRxPacketLen; /* Current rx packet length */
480 extern unsigned NetIPID; /* IP ID (counting) */
481 extern uchar NetBcastAddr[6]; /* Ethernet boardcast address */
482 extern uchar NetEtherNullAddr[6];
484 #define VLAN_NONE 4095 /* untagged */
485 #define VLAN_IDMASK 0x0fff /* mask of valid vlan id */
486 extern ushort NetOurVLAN; /* Our VLAN */
487 extern ushort NetOurNativeVLAN; /* Our Native VLAN */
489 extern int NetRestartWrap; /* Tried all network devices */
492 BOOTP, RARP, ARP, TFTPGET, DHCP, PING, DNS, NFS, CDP, NETCONS, SNTP,
493 TFTPSRV, TFTPPUT, LINKLOCAL
497 extern char BootFile[128]; /* Boot File name */
499 #if defined(CONFIG_CMD_DNS)
500 extern char *NetDNSResolve; /* The host to resolve */
501 extern char *NetDNSenvvar; /* the env var to put the ip into */
504 #if defined(CONFIG_CMD_PING)
505 extern IPaddr_t NetPingIP; /* the ip address to ping */
508 #if defined(CONFIG_CMD_CDP)
509 /* when CDP completes these hold the return values */
510 extern ushort CDPNativeVLAN; /* CDP returned native VLAN */
511 extern ushort CDPApplianceVLAN; /* CDP returned appliance VLAN */
514 * Check for a CDP packet by examining the received MAC address field
516 static inline int is_cdp_packet(const uchar *et_addr)
518 extern const uchar NetCDPAddr[6];
520 return memcmp(et_addr, NetCDPAddr, 6) == 0;
524 #if defined(CONFIG_CMD_SNTP)
525 extern IPaddr_t NetNtpServerIP; /* the ip address to NTP */
526 extern int NetTimeOffset; /* offset time from UTC */
529 #if defined(CONFIG_MCAST_TFTP)
530 extern IPaddr_t Mcast_addr;
533 /* Initialize the network adapter */
535 int NetLoop(enum proto_t);
537 /* Shutdown adapters and cleanup */
540 /* Load failed. Start again. */
541 void NetStartAgain(void);
543 /* Get size of the ethernet header when we send */
544 int NetEthHdrSize(void);
546 /* Set ethernet header; returns the size of the header */
547 int NetSetEther(uchar *, uchar *, uint);
548 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot);
551 void net_set_ip_header(uchar *pkt, IPaddr_t dest, IPaddr_t source);
552 void net_set_udp_header(uchar *pkt, IPaddr_t dest, int dport,
556 * compute_ip_checksum() - Compute IP checksum
558 * @addr: Address to check (must be 16-bit aligned)
559 * @nbytes: Number of bytes to check (normally a multiple of 2)
560 * @return 16-bit IP checksum
562 unsigned compute_ip_checksum(const void *addr, unsigned nbytes);
565 * add_ip_checksums() - add two IP checksums
567 * @offset: Offset of first sum (if odd we do a byte-swap)
568 * @sum: First checksum
569 * @new_sum: New checksum to add
570 * @return updated 16-bit IP checksum
572 unsigned add_ip_checksums(unsigned offset, unsigned sum, unsigned new_sum);
575 * ip_checksum_ok() - check if a checksum is correct
577 * This works by making sure the checksum sums to 0
579 * @addr: Address to check (must be 16-bit aligned)
580 * @nbytes: Number of bytes to check (normally a multiple of 2)
581 * @return true if the checksum matches, false if not
583 int ip_checksum_ok(const void *addr, unsigned nbytes);
586 rxhand_f *net_get_udp_handler(void); /* Get UDP RX packet handler */
587 void net_set_udp_handler(rxhand_f *); /* Set UDP RX packet handler */
588 rxhand_f *net_get_arp_handler(void); /* Get ARP RX packet handler */
589 void net_set_arp_handler(rxhand_f *); /* Set ARP RX packet handler */
590 void net_set_icmp_handler(rxhand_icmp_f *f); /* Set ICMP RX handler */
591 void NetSetTimeout(ulong, thand_f *);/* Set timeout handler */
593 /* Network loop state */
594 enum net_loop_state {
600 extern enum net_loop_state net_state;
602 static inline void net_set_state(enum net_loop_state state)
604 debug_cond(DEBUG_INT_STATE, "--- NetState set to %d\n", state);
608 /* Transmit a packet */
609 static inline void NetSendPacket(uchar *pkt, int len)
611 (void) eth_send(pkt, len);
615 * Transmit "NetTxPacket" as UDP packet, performing ARP request if needed
616 * (ether will be populated)
618 * @param ether Raw packet buffer
619 * @param dest IP address to send the datagram to
620 * @param dport Destination UDP port
621 * @param sport Source UDP port
622 * @param payload_len Length of data after the UDP header
624 int NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport,
625 int sport, int payload_len);
627 #ifndef CONFIG_DM_ETH
628 #define NetReceive(in_packet, len) net_process_received_packet(in_packet, len)
630 /* Processes a received packet */
631 void net_process_received_packet(uchar *in_packet, int len);
633 #ifdef CONFIG_NETCONSOLE
635 int nc_input_packet(uchar *pkt, IPaddr_t src_ip, unsigned dest_port,
636 unsigned src_port, unsigned len);
639 static inline __attribute__((always_inline)) int eth_is_on_demand_init(void)
641 #ifdef CONFIG_NETCONSOLE
642 extern enum proto_t net_loop_last_protocol;
644 return net_loop_last_protocol != NETCONS;
650 static inline void eth_set_last_protocol(int protocol)
652 #ifdef CONFIG_NETCONSOLE
653 extern enum proto_t net_loop_last_protocol;
655 net_loop_last_protocol = protocol;
660 * Check if autoload is enabled. If so, use either NFS or TFTP to download
663 void net_auto_load(void);
666 * The following functions are a bit ugly, but necessary to deal with
667 * alignment restrictions on ARM.
669 * We're using inline functions, which had the smallest memory
670 * footprint in our tests.
672 /* return IP *in network byteorder* */
673 static inline IPaddr_t NetReadIP(void *from)
677 memcpy((void *)&ip, (void *)from, sizeof(ip));
681 /* return ulong *in network byteorder* */
682 static inline ulong NetReadLong(ulong *from)
686 memcpy((void *)&l, (void *)from, sizeof(l));
690 /* write IP *in network byteorder* */
691 static inline void NetWriteIP(void *to, IPaddr_t ip)
693 memcpy(to, (void *)&ip, sizeof(ip));
697 static inline void NetCopyIP(void *to, void *from)
699 memcpy((void *)to, from, sizeof(IPaddr_t));
703 static inline void NetCopyLong(ulong *to, ulong *from)
705 memcpy((void *)to, (void *)from, sizeof(ulong));
709 * is_zero_ether_addr - Determine if give Ethernet address is all zeros.
710 * @addr: Pointer to a six-byte array containing the Ethernet address
712 * Return true if the address is all zeroes.
714 static inline int is_zero_ether_addr(const u8 *addr)
716 return !(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]);
720 * is_multicast_ether_addr - Determine if the Ethernet address is a multicast.
721 * @addr: Pointer to a six-byte array containing the Ethernet address
723 * Return true if the address is a multicast address.
724 * By definition the broadcast address is also a multicast address.
726 static inline int is_multicast_ether_addr(const u8 *addr)
728 return 0x01 & addr[0];
732 * is_broadcast_ether_addr - Determine if the Ethernet address is broadcast
733 * @addr: Pointer to a six-byte array containing the Ethernet address
735 * Return true if the address is the broadcast address.
737 static inline int is_broadcast_ether_addr(const u8 *addr)
739 return (addr[0] & addr[1] & addr[2] & addr[3] & addr[4] & addr[5]) ==
744 * is_valid_ether_addr - Determine if the given Ethernet address is valid
745 * @addr: Pointer to a six-byte array containing the Ethernet address
747 * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not
748 * a multicast address, and is not FF:FF:FF:FF:FF:FF.
750 * Return true if the address is valid.
752 static inline int is_valid_ether_addr(const u8 *addr)
754 /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to
755 * explicitly check for it here. */
756 return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr);
760 * eth_random_addr - Generate software assigned random Ethernet address
761 * @addr: Pointer to a six-byte array containing the Ethernet address
763 * Generate a random Ethernet address (MAC) that is not multicast
764 * and has the local assigned bit set.
766 static inline void eth_random_addr(uchar *addr)
769 unsigned int seed = get_timer(0);
771 for (i = 0; i < 6; i++)
772 addr[i] = rand_r(&seed);
774 addr[0] &= 0xfe; /* clear multicast bit */
775 addr[0] |= 0x02; /* set local assignment bit (IEEE802) */
778 /* Convert an IP address to a string */
779 void ip_to_string(IPaddr_t x, char *s);
781 /* Convert a string to ip address */
782 IPaddr_t string_to_ip(const char *s);
784 /* Convert a VLAN id to a string */
785 void VLAN_to_string(ushort x, char *s);
787 /* Convert a string to a vlan id */
788 ushort string_to_VLAN(const char *s);
790 /* read a VLAN id from an environment variable */
791 ushort getenv_VLAN(char *);
793 /* copy a filename (allow for "..." notation, limit length) */
794 void copy_filename(char *dst, const char *src, int size);
796 /* get a random source port */
797 unsigned int random_port(void);
799 /* Update U-Boot over TFTP */
800 int update_tftp(ulong addr);
802 /**********************************************************************/
804 #endif /* __NET_H__ */