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wdenk
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358
include/net.h
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358
include/net.h
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/*
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* LiMon Monitor (LiMon) - Network.
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*
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* Copyright 1994 - 2000 Neil Russell.
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* (See License)
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*
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*
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* History
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* 9/16/00 bor adapted to TQM823L/STK8xxL board, RARP/TFTP boot added
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*/
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#ifndef __NET_H__
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#define __NET_H__
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#if !defined(CONFIG_NET_MULTI) && defined(CONFIG_8xx)
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#include <commproc.h>
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#if defined(FEC_ENET) || defined(SCC_ENET)
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#define CONFIG_NET_MULTI
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#endif
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#endif
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#include <asm/byteorder.h> /* for nton* / ntoh* stuff */
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/*
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* The number of receive packet buffers, and the required packet buffer
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* alignment in memory.
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*
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*/
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#define PKTBUFSRX 4
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#define PKTALIGN 32
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typedef ulong IPaddr_t;
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/*
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* The current receive packet handler. Called with a pointer to the
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* application packet, and a protocol type (PORT_BOOTPC or PORT_TFTP).
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* All other packets are dealt with without calling the handler.
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*/
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typedef void rxhand_f(uchar *, unsigned, unsigned, unsigned);
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/*
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* A timeout handler. Called after time interval has expired.
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*/
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typedef void thand_f(void);
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#ifdef CONFIG_NET_MULTI
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#define NAMESIZE 16
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enum eth_state_t {
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ETH_STATE_INIT,
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ETH_STATE_PASSIVE,
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ETH_STATE_ACTIVE
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};
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struct eth_device {
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char name[NAMESIZE];
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unsigned char enetaddr[6];
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int iobase;
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int state;
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int (*init) (struct eth_device*, bd_t*);
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int (*send) (struct eth_device*, volatile void* pachet, int length);
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int (*recv) (struct eth_device*);
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void (*halt) (struct eth_device*);
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struct eth_device *next;
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void *priv;
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};
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extern int eth_initialize(bd_t *bis); /* Initialize network subsystem */
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extern int eth_register(struct eth_device* dev);/* Register network device */
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extern void eth_try_another(int first_restart); /* Change the device */
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extern struct eth_device *eth_get_dev(void); /* get the current device MAC */
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extern void eth_set_enetaddr(int num, char* a); /* Set new MAC address */
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#endif
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extern int eth_init(bd_t *bis); /* Initialize the device */
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extern int eth_send(volatile void *packet, int length); /* Send a packet */
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extern int eth_rx(void); /* Check for received packets */
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extern void eth_halt(void); /* stop SCC */
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/**********************************************************************/
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/*
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* Protocol headers.
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*/
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/*
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* Ethernet header
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*/
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typedef struct {
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uchar et_dest[6]; /* Destination node */
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uchar et_src[6]; /* Source node */
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ushort et_protlen; /* Protocol or length */
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uchar et_dsap; /* 802 DSAP */
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uchar et_ssap; /* 802 SSAP */
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uchar et_ctl; /* 802 control */
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uchar et_snap1; /* SNAP */
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uchar et_snap2;
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uchar et_snap3;
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ushort et_prot; /* 802 protocol */
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} Ethernet_t;
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#define ETHER_HDR_SIZE 14 /* Ethernet header size */
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#define E802_HDR_SIZE 22 /* 802 ethernet header size */
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#define PROT_IP 0x0800 /* IP protocol */
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#define PROT_ARP 0x0806 /* IP ARP protocol */
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#define PROT_RARP 0x8035 /* IP ARP protocol */
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#define IPPROTO_ICMP 1 /* Internet Control Message Protocol */
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#define IPPROTO_UDP 17 /* User Datagram Protocol */
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/*
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* Internet Protocol (IP) header.
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*/
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typedef struct {
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uchar ip_hl_v; /* header length and version */
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uchar ip_tos; /* type of service */
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ushort ip_len; /* total length */
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ushort ip_id; /* identification */
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ushort ip_off; /* fragment offset field */
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uchar ip_ttl; /* time to live */
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uchar ip_p; /* protocol */
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ushort ip_sum; /* checksum */
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IPaddr_t ip_src; /* Source IP address */
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IPaddr_t ip_dst; /* Destination IP address */
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ushort udp_src; /* UDP source port */
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ushort udp_dst; /* UDP destination port */
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ushort udp_len; /* Length of UDP packet */
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ushort udp_xsum; /* Checksum */
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} IP_t;
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#define IP_HDR_SIZE_NO_UDP (sizeof (IP_t) - 8)
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#define IP_HDR_SIZE (sizeof (IP_t))
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/*
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* Address Resolution Protocol (ARP) header.
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*/
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typedef struct
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{
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ushort ar_hrd; /* Format of hardware address */
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# define ARP_ETHER 1 /* Ethernet hardware address */
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ushort ar_pro; /* Format of protocol address */
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uchar ar_hln; /* Length of hardware address */
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uchar ar_pln; /* Length of protocol address */
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ushort ar_op; /* Operation */
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# define ARPOP_REQUEST 1 /* Request to resolve address */
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# define ARPOP_REPLY 2 /* Response to previous request */
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# define RARPOP_REQUEST 3 /* Request to resolve address */
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# define RARPOP_REPLY 4 /* Response to previous request */
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/*
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* The remaining fields are variable in size, according to
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* the sizes above, and are defined as appropriate for
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* specific hardware/protocol combinations.
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*/
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uchar ar_data[0];
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#if 0
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uchar ar_sha[]; /* Sender hardware address */
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uchar ar_spa[]; /* Sender protocol address */
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uchar ar_tha[]; /* Target hardware address */
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uchar ar_tpa[]; /* Target protocol address */
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#endif /* 0 */
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} ARP_t;
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#define ARP_HDR_SIZE (8+20) /* Size assuming ethernet */
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/*
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* ICMP stuff (just enough to handle (host) redirect messages)
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*/
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#define ICMP_REDIRECT 5 /* Redirect (change route) */
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/* Codes for REDIRECT. */
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#define ICMP_REDIR_NET 0 /* Redirect Net */
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#define ICMP_REDIR_HOST 1 /* Redirect Host */
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typedef struct icmphdr {
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uchar type;
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uchar code;
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ushort checksum;
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union {
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struct {
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ushort id;
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ushort sequence;
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} echo;
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ulong gateway;
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struct {
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ushort __unused;
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ushort mtu;
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} frag;
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} un;
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} ICMP_t;
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/*
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* Maximum packet size; used to allocate packet storage.
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* TFTP packets can be 524 bytes + IP header + ethernet header.
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* Lets be conservative, and go for 38 * 16. (Must also be
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* a multiple of 32 bytes).
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*/
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/*
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* AS.HARNOIS : Better to set PKTSIZE to maximum size because
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* traffic type is not always controlled
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* maximum packet size = 1518
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* maximum packet size and multiple of 32 bytes = 1536
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*/
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#define PKTSIZE 1518
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#define PKTSIZE_ALIGN 1536
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/*#define PKTSIZE 608*/
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/*
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* Maximum receive ring size; that is, the number of packets
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* we can buffer before overflow happens. Basically, this just
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* needs to be enough to prevent a packet being discarded while
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* we are processing the previous one.
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*/
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#define RINGSZ 4
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#define RINGSZ_LOG2 2
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/**********************************************************************/
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/*
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* Globals.
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*
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* Note:
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*
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* All variables of type IPaddr_t are stored in NETWORK byte order
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* (big endian).
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*/
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/* net.c */
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/** BOOTP EXTENTIONS **/
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extern IPaddr_t NetOurGatewayIP; /* Our gateway IP addresse */
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extern IPaddr_t NetOurSubnetMask; /* Our subnet mask (0 = unknown)*/
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extern IPaddr_t NetOurDNSIP; /* Our Domain Name Server (0 = unknown)*/
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extern char NetOurNISDomain[32]; /* Our NIS domain */
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extern char NetOurHostName[32]; /* Our hostname */
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extern char NetOurRootPath[64]; /* Our root path */
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extern ushort NetBootFileSize; /* Our boot file size in blocks */
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/** END OF BOOTP EXTENTIONS **/
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extern ulong NetBootFileXferSize; /* size of bootfile in bytes */
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extern uchar NetOurEther[6]; /* Our ethernet address */
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extern uchar NetServerEther[6]; /* Boot server enet address */
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extern IPaddr_t NetOurIP; /* Our IP addr (0 = unknown) */
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extern IPaddr_t NetServerIP; /* Server IP addr (0 = unknown) */
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extern volatile uchar * NetTxPacket; /* THE transmit packet */
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extern volatile uchar * NetRxPackets[PKTBUFSRX];/* Receive packets */
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extern volatile uchar * NetRxPkt; /* Current receive packet */
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extern int NetRxPktLen; /* Current rx packet length */
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extern unsigned NetIPID; /* IP ID (counting) */
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extern uchar NetBcastAddr[6]; /* Ethernet boardcast address */
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extern int NetState; /* Network loop state */
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#define NETLOOP_CONTINUE 1
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#define NETLOOP_RESTART 2
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#define NETLOOP_SUCCESS 3
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#define NETLOOP_FAIL 4
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#ifdef CONFIG_NET_MULTI
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extern int NetRestartWrap; /* Tried all network devices */
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#endif
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typedef enum { BOOTP, RARP, ARP, TFTP, DHCP } proto_t;
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/* from net/net.c */
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extern char BootFile[128]; /* Boot File name */
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/* Initialize the network adapter */
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extern int NetLoop(proto_t);
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/* Shutdown adapters and cleanup */
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extern void NetStop(void);
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/* Load failed. Start again. */
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extern void NetStartAgain(void);
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/* Set ethernet header */
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extern void NetSetEther(volatile uchar *, uchar *, uint);
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/* Set IP header */
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extern void NetSetIP(volatile uchar *, IPaddr_t, int, int, int);
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/* Checksum */
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extern int NetCksumOk(uchar *, int); /* Return true if cksum OK */
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extern uint NetCksum(uchar *, int); /* Calculate the checksum */
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/* Set callbacks */
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extern void NetSetHandler(rxhand_f *); /* Set RX packet handler */
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extern void NetSetTimeout(int, thand_f *); /* Set timeout handler */
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/* Transmit "NetTxPacket" */
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extern void NetSendPacket(volatile uchar *, int);
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/* Processes a received packet */
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extern void NetReceive(volatile uchar *, int);
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/* Print an IP address on the console */
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extern void print_IPaddr (IPaddr_t);
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/*
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* The following functions are a bit ugly, but necessary to deal with
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* alignment restrictions on ARM.
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*
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* We're using inline functions, which had the smallest memory
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* footprint in our tests.
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*/
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/* return IP *in network byteorder* */
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static inline IPaddr_t NetReadIP(void *from)
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{
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IPaddr_t ip;
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memcpy((void*)&ip, from, sizeof(ip));
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return ip;
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}
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/* return ulong *in network byteorder* */
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static inline ulong NetReadLong(ulong *from)
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{
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ulong l;
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memcpy((void*)&l, (void*)from, sizeof(l));
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return l;
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}
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/* write IP *in network byteorder* */
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static inline void NetWriteIP(void *to, IPaddr_t ip)
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{
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memcpy(to, (void*)&ip, sizeof(ip));
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}
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/* copy IP */
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static inline void NetCopyIP(void *to, void *from)
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{
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memcpy(to, from, sizeof(IPaddr_t));
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}
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/* copy ulong */
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static inline void NetCopyLong(ulong *to, ulong *from)
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{
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memcpy((void*)to, (void*)from, sizeof(ulong));
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}
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/* Convert an IP address to a string */
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extern void ip_to_string (IPaddr_t x, char *s);
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/* read an IP address from a environment variable */
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extern IPaddr_t getenv_IPaddr (char *);
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/* copy a filename (allow for "..." notation, limit length) */
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extern void copy_filename (uchar *dst, uchar *src, int size);
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/**********************************************************************/
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#endif /* __NET_H__ */
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