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Diffstat (limited to 'include/net.h')
| -rw-r--r-- | include/net.h | 358 |
1 files changed, 358 insertions, 0 deletions
diff --git a/include/net.h b/include/net.h new file mode 100644 index 0000000..d4985ca --- /dev/null +++ b/include/net.h @@ -0,0 +1,358 @@ +/* + * LiMon Monitor (LiMon) - Network. + * + * Copyright 1994 - 2000 Neil Russell. + * (See License) + * + * + * History + * 9/16/00 bor adapted to TQM823L/STK8xxL board, RARP/TFTP boot added + */ + +#ifndef __NET_H__ +#define __NET_H__ + +#if !defined(CONFIG_NET_MULTI) && defined(CONFIG_8xx) +#include <commproc.h> +#if defined(FEC_ENET) || defined(SCC_ENET) +#define CONFIG_NET_MULTI +#endif +#endif +#include <asm/byteorder.h> /* for nton* / ntoh* stuff */ + + +/* + * The number of receive packet buffers, and the required packet buffer + * alignment in memory. + * + */ + +#define PKTBUFSRX 4 +#define PKTALIGN 32 + +typedef ulong IPaddr_t; + + + +/* + * The current receive packet handler. Called with a pointer to the + * application packet, and a protocol type (PORT_BOOTPC or PORT_TFTP). + * All other packets are dealt with without calling the handler. + */ +typedef void rxhand_f(uchar *, unsigned, unsigned, unsigned); + +/* + * A timeout handler. Called after time interval has expired. + */ +typedef void thand_f(void); + +#ifdef CONFIG_NET_MULTI + +#define NAMESIZE 16 + +enum eth_state_t { + ETH_STATE_INIT, + ETH_STATE_PASSIVE, + ETH_STATE_ACTIVE +}; + +struct eth_device { + char name[NAMESIZE]; + unsigned char enetaddr[6]; + int iobase; + int state; + + int (*init) (struct eth_device*, bd_t*); + int (*send) (struct eth_device*, volatile void* pachet, int length); + int (*recv) (struct eth_device*); + void (*halt) (struct eth_device*); + + struct eth_device *next; + void *priv; +}; + +extern int eth_initialize(bd_t *bis); /* Initialize network subsystem */ +extern int eth_register(struct eth_device* dev);/* Register network device */ +extern void eth_try_another(int first_restart); /* Change the device */ +extern struct eth_device *eth_get_dev(void); /* get the current device MAC */ +extern void eth_set_enetaddr(int num, char* a); /* Set new MAC address */ +#endif + +extern int eth_init(bd_t *bis); /* Initialize the device */ +extern int eth_send(volatile void *packet, int length); /* Send a packet */ +extern int eth_rx(void); /* Check for received packets */ +extern void eth_halt(void); /* stop SCC */ + + +/**********************************************************************/ +/* + * Protocol headers. + */ + +/* + * Ethernet header + */ +typedef struct { + uchar et_dest[6]; /* Destination node */ + uchar et_src[6]; /* Source node */ + ushort et_protlen; /* Protocol or length */ + uchar et_dsap; /* 802 DSAP */ + uchar et_ssap; /* 802 SSAP */ + uchar et_ctl; /* 802 control */ + uchar et_snap1; /* SNAP */ + uchar et_snap2; + uchar et_snap3; + ushort et_prot; /* 802 protocol */ +} Ethernet_t; + +#define ETHER_HDR_SIZE 14 /* Ethernet header size */ +#define E802_HDR_SIZE 22 /* 802 ethernet header size */ +#define PROT_IP 0x0800 /* IP protocol */ +#define PROT_ARP 0x0806 /* IP ARP protocol */ +#define PROT_RARP 0x8035 /* IP ARP protocol */ + +#define IPPROTO_ICMP 1 /* Internet Control Message Protocol */ +#define IPPROTO_UDP 17 /* User Datagram Protocol */ + +/* + * Internet Protocol (IP) header. + */ +typedef struct { + uchar ip_hl_v; /* header length and version */ + uchar ip_tos; /* type of service */ + ushort ip_len; /* total length */ + ushort ip_id; /* identification */ + ushort ip_off; /* fragment offset field */ + uchar ip_ttl; /* time to live */ + uchar ip_p; /* protocol */ + ushort ip_sum; /* checksum */ + IPaddr_t ip_src; /* Source IP address */ + IPaddr_t ip_dst; /* Destination IP address */ + ushort udp_src; /* UDP source port */ + ushort udp_dst; /* UDP destination port */ + ushort udp_len; /* Length of UDP packet */ + ushort udp_xsum; /* Checksum */ +} IP_t; + +#define IP_HDR_SIZE_NO_UDP (sizeof (IP_t) - 8) +#define IP_HDR_SIZE (sizeof (IP_t)) + + +/* + * Address Resolution Protocol (ARP) header. + */ +typedef struct +{ + ushort ar_hrd; /* Format of hardware address */ +# define ARP_ETHER 1 /* Ethernet hardware address */ + ushort ar_pro; /* Format of protocol address */ + uchar ar_hln; /* Length of hardware address */ + uchar ar_pln; /* Length of protocol address */ + ushort ar_op; /* Operation */ +# define ARPOP_REQUEST 1 /* Request to resolve address */ +# define ARPOP_REPLY 2 /* Response to previous request */ + +# define RARPOP_REQUEST 3 /* Request to resolve address */ +# define RARPOP_REPLY 4 /* Response to previous request */ + + /* + * The remaining fields are variable in size, according to + * the sizes above, and are defined as appropriate for + * specific hardware/protocol combinations. + */ + uchar ar_data[0]; +#if 0 + uchar ar_sha[]; /* Sender hardware address */ + uchar ar_spa[]; /* Sender protocol address */ + uchar ar_tha[]; /* Target hardware address */ + uchar ar_tpa[]; /* Target protocol address */ +#endif /* 0 */ +} ARP_t; + +#define ARP_HDR_SIZE (8+20) /* Size assuming ethernet */ + +/* + * ICMP stuff (just enough to handle (host) redirect messages) + */ +#define ICMP_REDIRECT 5 /* Redirect (change route) */ + +/* Codes for REDIRECT. */ +#define ICMP_REDIR_NET 0 /* Redirect Net */ +#define ICMP_REDIR_HOST 1 /* Redirect Host */ + +typedef struct icmphdr { + uchar type; + uchar code; + ushort checksum; + union { + struct { + ushort id; + ushort sequence; + } echo; + ulong gateway; + struct { + ushort __unused; + ushort mtu; + } frag; + } un; +} ICMP_t; + + + +/* + * Maximum packet size; used to allocate packet storage. + * TFTP packets can be 524 bytes + IP header + ethernet header. + * Lets be conservative, and go for 38 * 16. (Must also be + * a multiple of 32 bytes). + */ +/* + * AS.HARNOIS : Better to set PKTSIZE to maximum size because + * traffic type is not always controlled + * maximum packet size = 1518 + * maximum packet size and multiple of 32 bytes = 1536 + */ +#define PKTSIZE 1518 +#define PKTSIZE_ALIGN 1536 +/*#define PKTSIZE 608*/ + +/* + * Maximum receive ring size; that is, the number of packets + * we can buffer before overflow happens. Basically, this just + * needs to be enough to prevent a packet being discarded while + * we are processing the previous one. + */ +#define RINGSZ 4 +#define RINGSZ_LOG2 2 + +/**********************************************************************/ +/* + * Globals. + * + * Note: + * + * All variables of type IPaddr_t are stored in NETWORK byte order + * (big endian). + */ + +/* net.c */ +/** BOOTP EXTENTIONS **/ +extern IPaddr_t NetOurGatewayIP; /* Our gateway IP addresse */ +extern IPaddr_t NetOurSubnetMask; /* Our subnet mask (0 = unknown)*/ +extern IPaddr_t NetOurDNSIP; /* Our Domain Name Server (0 = unknown)*/ +extern char NetOurNISDomain[32]; /* Our NIS domain */ +extern char NetOurHostName[32]; /* Our hostname */ +extern char NetOurRootPath[64]; /* Our root path */ +extern ushort NetBootFileSize; /* Our boot file size in blocks */ +/** END OF BOOTP EXTENTIONS **/ +extern ulong NetBootFileXferSize; /* size of bootfile in bytes */ +extern uchar NetOurEther[6]; /* Our ethernet address */ +extern uchar NetServerEther[6]; /* Boot server enet address */ +extern IPaddr_t NetOurIP; /* Our IP addr (0 = unknown) */ +extern IPaddr_t NetServerIP; /* Server IP addr (0 = unknown) */ +extern volatile uchar * NetTxPacket; /* THE transmit packet */ +extern volatile uchar * NetRxPackets[PKTBUFSRX];/* Receive packets */ +extern volatile uchar * NetRxPkt; /* Current receive packet */ +extern int NetRxPktLen; /* Current rx packet length */ +extern unsigned NetIPID; /* IP ID (counting) */ +extern uchar NetBcastAddr[6]; /* Ethernet boardcast address */ + +extern int NetState; /* Network loop state */ +#define NETLOOP_CONTINUE 1 +#define NETLOOP_RESTART 2 +#define NETLOOP_SUCCESS 3 +#define NETLOOP_FAIL 4 + +#ifdef CONFIG_NET_MULTI +extern int NetRestartWrap; /* Tried all network devices */ +#endif + +typedef enum { BOOTP, RARP, ARP, TFTP, DHCP } proto_t; + +/* from net/net.c */ +extern char BootFile[128]; /* Boot File name */ + +/* Initialize the network adapter */ +extern int NetLoop(proto_t); + +/* Shutdown adapters and cleanup */ +extern void NetStop(void); + +/* Load failed. Start again. */ +extern void NetStartAgain(void); + +/* Set ethernet header */ +extern void NetSetEther(volatile uchar *, uchar *, uint); + +/* Set IP header */ +extern void NetSetIP(volatile uchar *, IPaddr_t, int, int, int); + +/* Checksum */ +extern int NetCksumOk(uchar *, int); /* Return true if cksum OK */ +extern uint NetCksum(uchar *, int); /* Calculate the checksum */ + +/* Set callbacks */ +extern void NetSetHandler(rxhand_f *); /* Set RX packet handler */ +extern void NetSetTimeout(int, thand_f *); /* Set timeout handler */ + +/* Transmit "NetTxPacket" */ +extern void NetSendPacket(volatile uchar *, int); + +/* Processes a received packet */ +extern void NetReceive(volatile uchar *, int); + +/* Print an IP address on the console */ +extern void print_IPaddr (IPaddr_t); + +/* + * The following functions are a bit ugly, but necessary to deal with + * alignment restrictions on ARM. + * + * We're using inline functions, which had the smallest memory + * footprint in our tests. + */ +/* return IP *in network byteorder* */ +static inline IPaddr_t NetReadIP(void *from) +{ + IPaddr_t ip; + memcpy((void*)&ip, from, sizeof(ip)); + return ip; +} + +/* return ulong *in network byteorder* */ +static inline ulong NetReadLong(ulong *from) +{ + ulong l; + memcpy((void*)&l, (void*)from, sizeof(l)); + return l; +} + +/* write IP *in network byteorder* */ +static inline void NetWriteIP(void *to, IPaddr_t ip) +{ + memcpy(to, (void*)&ip, sizeof(ip)); +} + +/* copy IP */ +static inline void NetCopyIP(void *to, void *from) +{ + memcpy(to, from, sizeof(IPaddr_t)); +} + +/* copy ulong */ +static inline void NetCopyLong(ulong *to, ulong *from) +{ + memcpy((void*)to, (void*)from, sizeof(ulong)); +} + +/* Convert an IP address to a string */ +extern void ip_to_string (IPaddr_t x, char *s); + +/* read an IP address from a environment variable */ +extern IPaddr_t getenv_IPaddr (char *); + +/* copy a filename (allow for "..." notation, limit length) */ +extern void copy_filename (uchar *dst, uchar *src, int size); + +/**********************************************************************/ + +#endif /* __NET_H__ */ |