include/net.h

   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_NET_MULTI) && defined(CONFIG_8xx)
  16 #include <commproc.h>
  17 #if defined(FEC_ENET) || defined(SCC_ENET)
  18 #define CONFIG_NET_MULTI
  19 #endif
  20 #endif
  21 #include <asm/byteorder.h>      /* for nton* / ntoh* stuff */
  22
  23
  24 /*
  25  *      The number of receive packet buffers, and the required packet buffer
  26  *      alignment in memory.
  27  *
  28  */
  29
  30 #define PKTBUFSRX       4
  31 #define PKTALIGN        32
  32
  33 typedef ulong           IPaddr_t;
  34
  35
  36
  37 /*
  38  * The current receive packet handler.  Called with a pointer to the
  39  * application packet, and a protocol type (PORT_BOOTPC or PORT_TFTP).
  40  * All other packets are dealt with without calling the handler.
  41  */
  42 typedef void    rxhand_f(uchar *, unsigned, unsigned, unsigned);
  43
  44 /*
  45  *      A timeout handler.  Called after time interval has expired.
  46  */
  47 typedef void    thand_f(void);
  48
  49 #ifdef CONFIG_NET_MULTI
  50
  51 #define NAMESIZE 16
  52
  53 enum eth_state_t {
  54         ETH_STATE_INIT,
  55         ETH_STATE_PASSIVE,
  56         ETH_STATE_ACTIVE
  57 };
  58
  59 struct eth_device {
  60         char name[NAMESIZE];
  61         unsigned char enetaddr[6];
  62         int iobase;
  63         int state;
  64
  65         int  (*init) (struct eth_device*, bd_t*);
  66         int  (*send) (struct eth_device*, volatile void* pachet, int length);
  67         int  (*recv) (struct eth_device*);
  68         void (*halt) (struct eth_device*);
  69
  70         struct eth_device *next;
  71         void *priv;
  72 };
  73
  74 extern int eth_initialize(bd_t *bis);           /* Initialize network subsystem */
  75 extern int eth_register(struct eth_device* dev);/* Register network device      */
  76 extern void eth_try_another(int first_restart); /* Change the device            */
  77 extern struct eth_device *eth_get_dev(void);    /* get the current device MAC   */
  78 extern void eth_set_enetaddr(int num, char* a); /* Set new MAC address          */
  79 #endif
  80
  81 extern int eth_init(bd_t *bis);                 /* Initialize the device        */
  82 extern int eth_send(volatile void *packet, int length);    /* Send a packet     */
  83 extern int eth_rx(void);                        /* Check for received packets   */
  84 extern void eth_halt(void);                     /* stop SCC                     */
  85
  86
  87 /**********************************************************************/
  88 /*
  89  *      Protocol headers.
  90  */
  91
  92 /*
  93  *      Ethernet header
  94  */
  95 typedef struct {
  96         uchar           et_dest[6];     /* Destination node             */
  97         uchar           et_src[6];      /* Source node                  */
  98         ushort          et_protlen;     /* Protocol or length           */
  99         uchar           et_dsap;        /* 802 DSAP                     */
 100         uchar           et_ssap;        /* 802 SSAP                     */
 101         uchar           et_ctl;         /* 802 control                  */
 102         uchar           et_snap1;       /* SNAP                         */
 103         uchar           et_snap2;
 104         uchar           et_snap3;
 105         ushort          et_prot;        /* 802 protocol                 */
 106 } Ethernet_t;
 107
 108 #define ETHER_HDR_SIZE  14              /* Ethernet header size         */
 109 #define E802_HDR_SIZE   22              /* 802 ethernet header size     */
 110 #define PROT_IP         0x0800          /* IP protocol                  */
 111 #define PROT_ARP        0x0806          /* IP ARP protocol              */
 112 #define PROT_RARP       0x8035          /* IP ARP protocol              */
 113
 114 #define IPPROTO_ICMP     1      /* Internet Control Message Protocol    */
 115 #define IPPROTO_UDP     17      /* User Datagram Protocol               */
 116
 117 /*
 118  *      Internet Protocol (IP) header.
 119  */
 120 typedef struct {
 121         uchar           ip_hl_v;        /* header length and version    */
 122         uchar           ip_tos;         /* type of service              */
 123         ushort          ip_len;         /* total length                 */
 124         ushort          ip_id;          /* identification               */
 125         ushort          ip_off;         /* fragment offset field        */
 126         uchar           ip_ttl;         /* time to live                 */
 127         uchar           ip_p;           /* protocol                     */
 128         ushort          ip_sum;         /* checksum                     */
 129         IPaddr_t        ip_src;         /* Source IP address            */
 130         IPaddr_t        ip_dst;         /* Destination IP address       */
 131         ushort          udp_src;        /* UDP source port              */
 132         ushort          udp_dst;        /* UDP destination port         */
 133         ushort          udp_len;        /* Length of UDP packet         */
 134         ushort          udp_xsum;       /* Checksum                     */
 135 } IP_t;
 136
 137 #define IP_HDR_SIZE_NO_UDP      (sizeof (IP_t) - 8)
 138 #define IP_HDR_SIZE             (sizeof (IP_t))
 139
 140
 141 /*
 142  *      Address Resolution Protocol (ARP) header.
 143  */
 144 typedef struct
 145 {
 146         ushort          ar_hrd;         /* Format of hardware address   */
 147 #   define ARP_ETHER        1           /* Ethernet  hardware address   */
 148         ushort          ar_pro;         /* Format of protocol address   */
 149         uchar           ar_hln;         /* Length of hardware address   */
 150         uchar           ar_pln;         /* Length of protocol address   */
 151         ushort          ar_op;          /* Operation                    */
 152 #   define ARPOP_REQUEST    1           /* Request  to resolve  address */
 153 #   define ARPOP_REPLY      2           /* Response to previous request */
 154
 155 #   define RARPOP_REQUEST   3           /* Request  to resolve  address */
 156 #   define RARPOP_REPLY     4           /* Response to previous request */
 157
 158         /*
 159          * The remaining fields are variable in size, according to
 160          * the sizes above, and are defined as appropriate for
 161          * specific hardware/protocol combinations.
 162          */
 163         uchar           ar_data[0];
 164 #if 0
 165         uchar           ar_sha[];       /* Sender hardware address      */
 166         uchar           ar_spa[];       /* Sender protocol address      */
 167         uchar           ar_tha[];       /* Target hardware address      */
 168         uchar           ar_tpa[];       /* Target protocol address      */
 169 #endif /* 0 */
 170 } ARP_t;
 171
 172 #define ARP_HDR_SIZE    (8+20)          /* Size assuming ethernet       */
 173
 174 /*
 175  * ICMP stuff (just enough to handle (host) redirect messages)
 176  */
 177 #define ICMP_REDIRECT           5       /* Redirect (change route)      */
 178
 179 /* Codes for REDIRECT. */
 180 #define ICMP_REDIR_NET          0       /* Redirect Net                 */
 181 #define ICMP_REDIR_HOST         1       /* Redirect Host                */
 182
 183 typedef struct icmphdr {
 184         uchar           type;
 185         uchar           code;
 186         ushort          checksum;
 187         union {
 188                 struct {
 189                         ushort  id;
 190                         ushort  sequence;
 191                 } echo;
 192                 ulong   gateway;
 193                 struct {
 194                         ushort  __unused;
 195                         ushort  mtu;
 196                 } frag;
 197         } un;
 198 } ICMP_t;
 199
 200
 201
 202 /*
 203  * Maximum packet size; used to allocate packet storage.
 204  * TFTP packets can be 524 bytes + IP header + ethernet header.
 205  * Lets be conservative, and go for 38 * 16.  (Must also be
 206  * a multiple of 32 bytes).
 207  */
 208 /*
 209  * AS.HARNOIS : Better to set PKTSIZE to maximum size because
 210  * traffic type is not always controlled
 211  * maximum packet size =  1518
 212  * maximum packet size and multiple of 32 bytes =  1536
 213  */
 214 #define PKTSIZE                 1518
 215 #define PKTSIZE_ALIGN           1536
 216 /*#define PKTSIZE               608*/
 217
 218 /*
 219  * Maximum receive ring size; that is, the number of packets
 220  * we can buffer before overflow happens. Basically, this just
 221  * needs to be enough to prevent a packet being discarded while
 222  * we are processing the previous one.
 223  */
 224 #define RINGSZ          4
 225 #define RINGSZ_LOG2     2
 226
 227 /**********************************************************************/
 228 /*
 229  *      Globals.
 230  *
 231  * Note:
 232  *
 233  * All variables of type IPaddr_t are stored in NETWORK byte order
 234  * (big endian).
 235  */
 236
 237 /* net.c */
 238 /** BOOTP EXTENTIONS **/
 239 extern IPaddr_t         NetOurGatewayIP;        /* Our gateway IP addresse      */
 240 extern IPaddr_t         NetOurSubnetMask;       /* Our subnet mask (0 = unknown)*/
 241 extern IPaddr_t         NetOurDNSIP;     /* Our Domain Name Server (0 = unknown)*/
 242 extern char             NetOurNISDomain[32];    /* Our NIS domain               */
 243 extern char             NetOurHostName[32];     /* Our hostname                 */
 244 extern char             NetOurRootPath[64];     /* Our root path                */
 245 extern ushort           NetBootFileSize;        /* Our boot file size in blocks */
 246 /** END OF BOOTP EXTENTIONS **/
 247 extern ulong            NetBootFileXferSize;    /* size of bootfile in bytes    */
 248 extern uchar            NetOurEther[6];         /* Our ethernet address         */
 249 extern uchar            NetServerEther[6];      /* Boot server enet address     */
 250 extern IPaddr_t         NetOurIP;               /* Our    IP addr (0 = unknown) */
 251 extern IPaddr_t         NetServerIP;            /* Server IP addr (0 = unknown) */
 252 extern volatile uchar * NetTxPacket;            /* THE transmit packet          */
 253 extern volatile uchar * NetRxPackets[PKTBUFSRX];/* Receive packets              */
 254 extern volatile uchar * NetRxPkt;               /* Current receive packet       */
 255 extern int              NetRxPktLen;            /* Current rx packet length     */
 256 extern unsigned         NetIPID;                /* IP ID (counting)             */
 257 extern uchar            NetBcastAddr[6];        /* Ethernet boardcast address   */
 258
 259 extern int              NetState;               /* Network loop state           */
 260 #define NETLOOP_CONTINUE        1
 261 #define NETLOOP_RESTART         2
 262 #define NETLOOP_SUCCESS         3
 263 #define NETLOOP_FAIL            4
 264
 265 #ifdef CONFIG_NET_MULTI
 266 extern int              NetRestartWrap;         /* Tried all network devices    */
 267 #endif
 268
 269 typedef enum { BOOTP, RARP, ARP, TFTP, DHCP } proto_t;
 270
 271 /* from net/net.c */
 272 extern char     BootFile[128];                  /* Boot File name               */
 273
 274 /* Initialize the network adapter */
 275 extern int      NetLoop(proto_t);
 276
 277 /* Shutdown adapters and cleanup */
 278 extern void     NetStop(void);
 279
 280 /* Load failed.  Start again. */
 281 extern void     NetStartAgain(void);
 282
 283 /* Set ethernet header */
 284 extern void     NetSetEther(volatile uchar *, uchar *, uint);
 285
 286 /* Set IP header */
 287 extern void     NetSetIP(volatile uchar *, IPaddr_t, int, int, int);
 288
 289 /* Checksum */
 290 extern int      NetCksumOk(uchar *, int);       /* Return true if cksum OK      */
 291 extern uint     NetCksum(uchar *, int);         /* Calculate the checksum       */
 292
 293 /* Set callbacks */
 294 extern void     NetSetHandler(rxhand_f *);      /* Set RX packet handler        */
 295 extern void     NetSetTimeout(int, thand_f *);  /* Set timeout handler          */
 296
 297 /* Transmit "NetTxPacket" */
 298 extern void     NetSendPacket(volatile uchar *, int);
 299
 300 /* Processes a received packet */
 301 extern void     NetReceive(volatile uchar *, int);
 302
 303 /* Print an IP address on the console */
 304 extern void     print_IPaddr (IPaddr_t);
 305
 306 /*
 307  * The following functions are a bit ugly, but necessary to deal with
 308  * alignment restrictions on ARM.
 309  *
 310  * We're using inline functions, which had the smallest memory
 311  * footprint in our tests.
 312  */
 313 /* return IP *in network byteorder* */
 314 static inline IPaddr_t NetReadIP(void *from)
 315 {
 316         IPaddr_t ip;
 317         memcpy((void*)&ip, from, sizeof(ip));
 318         return ip;
 319 }
 320
 321 /* return ulong *in network byteorder* */
 322 static inline ulong NetReadLong(ulong *from)
 323 {
 324         ulong l;
 325         memcpy((void*)&l, (void*)from, sizeof(l));
 326         return l;
 327 }
 328
 329 /* write IP *in network byteorder* */
 330 static inline void NetWriteIP(void *to, IPaddr_t ip)
 331 {
 332         memcpy(to, (void*)&ip, sizeof(ip));
 333 }
 334
 335 /* copy IP */
 336 static inline void NetCopyIP(void *to, void *from)
 337 {
 338         memcpy(to, from, sizeof(IPaddr_t));
 339 }
 340
 341 /* copy ulong */
 342 static inline void NetCopyLong(ulong *to, ulong *from)
 343 {
 344         memcpy((void*)to, (void*)from, sizeof(ulong));
 345 }
 346
 347 /* Convert an IP address to a string */
 348 extern void     ip_to_string (IPaddr_t x, char *s);
 349
 350 /* read an IP address from a environment variable */
 351 extern IPaddr_t getenv_IPaddr (char *);
 352
 353 /* copy a filename (allow for "..." notation, limit length) */
 354 extern void     copy_filename (uchar *dst, uchar *src, int size);
 355
 356 /**********************************************************************/
 357
 358 #endif /* __NET_H__ */