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_8xx)
  16 #include <commproc.h>
  17 # if !defined(CONFIG_NET_MULTI)
  18 #  if defined(FEC_ENET) || defined(SCC_ENET)
  19 #   define CONFIG_NET_MULTI
  20 #  endif
  21 # endif
  22 #endif  /* CONFIG_8xx */
  23
  24 #if !defined(CONFIG_NET_MULTI) && defined(CONFIG_8260)
  25 #include <config.h>
  26 #if defined(CONFIG_ETHER_ON_FCC)
  27 #if defined(CONFIG_ETHER_ON_SCC)
  28 #error "Ethernet not correctly defined"
  29 #endif /* CONFIG_ETHER_ON_SCC */
  30 #define CONFIG_NET_MULTI
  31 #if (CONFIG_ETHER_INDEX == 1)
  32 #define CONFIG_ETHER_ON_FCC1
  33 # define CFG_CMXFCR_MASK1       CFG_CMXFCR_MASK
  34 # define CFG_CMXFCR_VALUE1      CFG_CMXFCR_VALUE
  35 #elif (CONFIG_ETHER_INDEX == 2)
  36 #define CONFIG_ETHER_ON_FCC2
  37 # define CFG_CMXFCR_MASK2       CFG_CMXFCR_MASK
  38 # define CFG_CMXFCR_VALUE2      CFG_CMXFCR_VALUE
  39 #elif (CONFIG_ETHER_INDEX == 3)
  40 #define CONFIG_ETHER_ON_FCC3
  41 # define CFG_CMXFCR_MASK3       CFG_CMXFCR_MASK
  42 # define CFG_CMXFCR_VALUE3      CFG_CMXFCR_VALUE
  43 #endif /* CONFIG_ETHER_INDEX */
  44 #endif /* CONFIG_ETHER_ON_FCC */
  45 #endif /* !CONFIG_NET_MULTI && CONFIG_8260 */
  46
  47 #include <asm/byteorder.h>      /* for nton* / ntoh* stuff */
  48
  49
  50 /*
  51  *      The number of receive packet buffers, and the required packet buffer
  52  *      alignment in memory.
  53  *
  54  */
  55
  56 #ifdef CFG_RX_ETH_BUFFER
  57 # define PKTBUFSRX      CFG_RX_ETH_BUFFER
  58 #else
  59 # define PKTBUFSRX      4
  60 #endif
  61
  62 #define PKTALIGN        32
  63
  64 typedef ulong           IPaddr_t;
  65
  66
  67 /*
  68  * The current receive packet handler.  Called with a pointer to the
  69  * application packet, and a protocol type (PORT_BOOTPC or PORT_TFTP).
  70  * All other packets are dealt with without calling the handler.
  71  */
  72 typedef void    rxhand_f(uchar *, unsigned, unsigned, unsigned);
  73
  74 /*
  75  *      A timeout handler.  Called after time interval has expired.
  76  */
  77 typedef void    thand_f(void);
  78
  79 #define NAMESIZE 16
  80
  81 enum eth_state_t {
  82         ETH_STATE_INIT,
  83         ETH_STATE_PASSIVE,
  84         ETH_STATE_ACTIVE
  85 };
  86
  87 struct eth_device {
  88         char name[NAMESIZE];
  89         unsigned char enetaddr[6];
  90         int iobase;
  91         int state;
  92
  93         int  (*init) (struct eth_device*, bd_t*);
  94         int  (*send) (struct eth_device*, volatile void* pachet, int length);
  95         int  (*recv) (struct eth_device*);
  96         void (*halt) (struct eth_device*);
  97
  98         struct eth_device *next;
  99         void *priv;
 100 };
 101
 102 extern int eth_initialize(bd_t *bis);           /* Initialize network subsystem */
 103 extern int eth_register(struct eth_device* dev);/* Register network device      */
 104 extern void eth_try_another(int first_restart); /* Change the device            */
 105 extern struct eth_device *eth_get_dev(void);    /* get the current device MAC   */
 106 extern void eth_set_enetaddr(int num, char* a); /* Set new MAC address          */
 107
 108 extern int eth_init(bd_t *bis);                 /* Initialize the device        */
 109 extern int eth_send(volatile void *packet, int length);    /* Send a packet     */
 110 extern int eth_rx(void);                        /* Check for received packets   */
 111 extern void eth_halt(void);                     /* stop SCC                     */
 112
 113
 114 /**********************************************************************/
 115 /*
 116  *      Protocol headers.
 117  */
 118
 119 /*
 120  *      Ethernet header
 121  */
 122 typedef struct {
 123         uchar           et_dest[6];     /* Destination node             */
 124         uchar           et_src[6];      /* Source node                  */
 125         ushort          et_protlen;     /* Protocol or length           */
 126         uchar           et_dsap;        /* 802 DSAP                     */
 127         uchar           et_ssap;        /* 802 SSAP                     */
 128         uchar           et_ctl;         /* 802 control                  */
 129         uchar           et_snap1;       /* SNAP                         */
 130         uchar           et_snap2;
 131         uchar           et_snap3;
 132         ushort          et_prot;        /* 802 protocol                 */
 133 } Ethernet_t;
 134
 135 #define ETHER_HDR_SIZE  14              /* Ethernet header size         */
 136 #define E802_HDR_SIZE   22              /* 802 ethernet header size     */
 137 #define PROT_IP         0x0800          /* IP protocol                  */
 138 #define PROT_ARP        0x0806          /* IP ARP protocol              */
 139 #define PROT_RARP       0x8035          /* IP ARP protocol              */
 140
 141 #define IPPROTO_ICMP     1      /* Internet Control Message Protocol    */
 142 #define IPPROTO_UDP     17      /* User Datagram Protocol               */
 143
 144 /*
 145  *      Internet Protocol (IP) header.
 146  */
 147 typedef struct {
 148         uchar           ip_hl_v;        /* header length and version    */
 149         uchar           ip_tos;         /* type of service              */
 150         ushort          ip_len;         /* total length                 */
 151         ushort          ip_id;          /* identification               */
 152         ushort          ip_off;         /* fragment offset field        */
 153         uchar           ip_ttl;         /* time to live                 */
 154         uchar           ip_p;           /* protocol                     */
 155         ushort          ip_sum;         /* checksum                     */
 156         IPaddr_t        ip_src;         /* Source IP address            */
 157         IPaddr_t        ip_dst;         /* Destination IP address       */
 158         ushort          udp_src;        /* UDP source port              */
 159         ushort          udp_dst;        /* UDP destination port         */
 160         ushort          udp_len;        /* Length of UDP packet         */
 161         ushort          udp_xsum;       /* Checksum                     */
 162 } IP_t;
 163
 164 #define IP_HDR_SIZE_NO_UDP      (sizeof (IP_t) - 8)
 165 #define IP_HDR_SIZE             (sizeof (IP_t))
 166
 167
 168 /*
 169  *      Address Resolution Protocol (ARP) header.
 170  */
 171 typedef struct
 172 {
 173         ushort          ar_hrd;         /* Format of hardware address   */
 174 #   define ARP_ETHER        1           /* Ethernet  hardware address   */
 175         ushort          ar_pro;         /* Format of protocol address   */
 176         uchar           ar_hln;         /* Length of hardware address   */
 177         uchar           ar_pln;         /* Length of protocol address   */
 178         ushort          ar_op;          /* Operation                    */
 179 #   define ARPOP_REQUEST    1           /* Request  to resolve  address */
 180 #   define ARPOP_REPLY      2           /* Response to previous request */
 181
 182 #   define RARPOP_REQUEST   3           /* Request  to resolve  address */
 183 #   define RARPOP_REPLY     4           /* Response to previous request */
 184
 185         /*
 186          * The remaining fields are variable in size, according to
 187          * the sizes above, and are defined as appropriate for
 188          * specific hardware/protocol combinations.
 189          */
 190         uchar           ar_data[0];
 191 #if 0
 192         uchar           ar_sha[];       /* Sender hardware address      */
 193         uchar           ar_spa[];       /* Sender protocol address      */
 194         uchar           ar_tha[];       /* Target hardware address      */
 195         uchar           ar_tpa[];       /* Target protocol address      */
 196 #endif /* 0 */
 197 } ARP_t;
 198
 199 #define ARP_HDR_SIZE    (8+20)          /* Size assuming ethernet       */
 200
 201 /*
 202  * ICMP stuff (just enough to handle (host) redirect messages)
 203  */
 204 #define ICMP_ECHO_REPLY         0       /* Echo reply                   */
 205 #define ICMP_REDIRECT           5       /* Redirect (change route)      */
 206 #define ICMP_ECHO_REQUEST       8       /* Echo request                 */
 207
 208 /* Codes for REDIRECT. */
 209 #define ICMP_REDIR_NET          0       /* Redirect Net                 */
 210 #define ICMP_REDIR_HOST         1       /* Redirect Host                */
 211
 212 typedef struct icmphdr {
 213         uchar           type;
 214         uchar           code;
 215         ushort          checksum;
 216         union {
 217                 struct {
 218                         ushort  id;
 219                         ushort  sequence;
 220                 } echo;
 221                 ulong   gateway;
 222                 struct {
 223                         ushort  __unused;
 224                         ushort  mtu;
 225                 } frag;
 226         } un;
 227 } ICMP_t;
 228
 229
 230 /*
 231  * Maximum packet size; used to allocate packet storage.
 232  * TFTP packets can be 524 bytes + IP header + ethernet header.
 233  * Lets be conservative, and go for 38 * 16.  (Must also be
 234  * a multiple of 32 bytes).
 235  */
 236 /*
 237  * AS.HARNOIS : Better to set PKTSIZE to maximum size because
 238  * traffic type is not always controlled
 239  * maximum packet size =  1518
 240  * maximum packet size and multiple of 32 bytes =  1536
 241  */
 242 #define PKTSIZE                 1518
 243 #define PKTSIZE_ALIGN           1536
 244 /*#define PKTSIZE               608*/
 245
 246 /*
 247  * Maximum receive ring size; that is, the number of packets
 248  * we can buffer before overflow happens. Basically, this just
 249  * needs to be enough to prevent a packet being discarded while
 250  * we are processing the previous one.
 251  */
 252 #define RINGSZ          4
 253 #define RINGSZ_LOG2     2
 254
 255 /**********************************************************************/
 256 /*
 257  *      Globals.
 258  *
 259  * Note:
 260  *
 261  * All variables of type IPaddr_t are stored in NETWORK byte order
 262  * (big endian).
 263  */
 264
 265 /* net.c */
 266 /** BOOTP EXTENTIONS **/
 267 extern IPaddr_t         NetOurGatewayIP;        /* Our gateway IP addresse      */
 268 extern IPaddr_t         NetOurSubnetMask;       /* Our subnet mask (0 = unknown)*/
 269 extern IPaddr_t         NetOurDNSIP;     /* Our Domain Name Server (0 = unknown)*/
 270 extern char             NetOurNISDomain[32];    /* Our NIS domain               */
 271 extern char             NetOurHostName[32];     /* Our hostname                 */
 272 extern char             NetOurRootPath[64];     /* Our root path                */
 273 extern ushort           NetBootFileSize;        /* Our boot file size in blocks */
 274 /** END OF BOOTP EXTENTIONS **/
 275 extern ulong            NetBootFileXferSize;    /* size of bootfile in bytes    */
 276 extern uchar            NetOurEther[6];         /* Our ethernet address         */
 277 extern uchar            NetServerEther[6];      /* Boot server enet address     */
 278 extern IPaddr_t         NetOurIP;               /* Our    IP addr (0 = unknown) */
 279 extern IPaddr_t         NetServerIP;            /* Server IP addr (0 = unknown) */
 280 extern volatile uchar * NetTxPacket;            /* THE transmit packet          */
 281 extern volatile uchar * NetRxPackets[PKTBUFSRX];/* Receive packets              */
 282 extern volatile uchar * NetRxPkt;               /* Current receive packet       */
 283 extern int              NetRxPktLen;            /* Current rx packet length     */
 284 extern unsigned         NetIPID;                /* IP ID (counting)             */
 285 extern uchar            NetBcastAddr[6];        /* Ethernet boardcast address   */
 286
 287 extern int              NetState;               /* Network loop state           */
 288 #define NETLOOP_CONTINUE        1
 289 #define NETLOOP_RESTART         2
 290 #define NETLOOP_SUCCESS         3
 291 #define NETLOOP_FAIL            4
 292
 293 #ifdef CONFIG_NET_MULTI
 294 extern int              NetRestartWrap;         /* Tried all network devices    */
 295 #endif
 296
 297 typedef enum { BOOTP, RARP, ARP, TFTP, DHCP, PING, DNS } proto_t;
 298
 299 /* from net/net.c */
 300 extern char     BootFile[128];                  /* Boot File name               */
 301
 302 #if (CONFIG_COMMANDS & CFG_CMD_PING)
 303 extern IPaddr_t NetPingIP;                      /* the ip address to ping               */
 304 #endif
 305
 306 /* Initialize the network adapter */
 307 extern int      NetLoop(proto_t);
 308
 309 /* Shutdown adapters and cleanup */
 310 extern void     NetStop(void);
 311
 312 /* Load failed.  Start again. */
 313 extern void     NetStartAgain(void);
 314
 315 /* Set ethernet header */
 316 extern void     NetSetEther(volatile uchar *, uchar *, uint);
 317
 318 /* Set IP header */
 319 extern void     NetSetIP(volatile uchar *, IPaddr_t, int, int, int);
 320
 321 /* Checksum */
 322 extern int      NetCksumOk(uchar *, int);       /* Return true if cksum OK      */
 323 extern uint     NetCksum(uchar *, int);         /* Calculate the checksum       */
 324
 325 /* Set callbacks */
 326 extern void     NetSetHandler(rxhand_f *);      /* Set RX packet handler        */
 327 extern void     NetSetTimeout(int, thand_f *);  /* Set timeout handler          */
 328
 329 /* Transmit "NetTxPacket" */
 330 extern void     NetSendPacket(volatile uchar *, int);
 331
 332 /* Transmit UDP packet, performing ARP request if needed */
 333 extern int      NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len);
 334
 335 /* Processes a received packet */
 336 extern void     NetReceive(volatile uchar *, int);
 337
 338 /* Print an IP address on the console */
 339 extern void     print_IPaddr (IPaddr_t);
 340
 341 /*
 342  * The following functions are a bit ugly, but necessary to deal with
 343  * alignment restrictions on ARM.
 344  *
 345  * We're using inline functions, which had the smallest memory
 346  * footprint in our tests.
 347  */
 348 /* return IP *in network byteorder* */
 349 static inline IPaddr_t NetReadIP(void *from)
 350 {
 351         IPaddr_t ip;
 352         memcpy((void*)&ip, from, sizeof(ip));
 353         return ip;
 354 }
 355
 356 /* return ulong *in network byteorder* */
 357 static inline ulong NetReadLong(ulong *from)
 358 {
 359         ulong l;
 360         memcpy((void*)&l, (void*)from, sizeof(l));
 361         return l;
 362 }
 363
 364 /* write IP *in network byteorder* */
 365 static inline void NetWriteIP(void *to, IPaddr_t ip)
 366 {
 367         memcpy(to, (void*)&ip, sizeof(ip));
 368 }
 369
 370 /* copy IP */
 371 static inline void NetCopyIP(void *to, void *from)
 372 {
 373         memcpy(to, from, sizeof(IPaddr_t));
 374 }
 375
 376 /* copy ulong */
 377 static inline void NetCopyLong(ulong *to, ulong *from)
 378 {
 379         memcpy((void*)to, (void*)from, sizeof(ulong));
 380 }
 381
 382 /* Convert an IP address to a string */
 383 extern void     ip_to_string (IPaddr_t x, char *s);
 384
 385 /* Convert a string to ip address */
 386 extern IPaddr_t string_to_ip(char *s);
 387
 388 /* read an IP address from a environment variable */
 389 extern IPaddr_t getenv_IPaddr (char *);
 390
 391 /* copy a filename (allow for "..." notation, limit length) */
 392 extern void     copy_filename (uchar *dst, uchar *src, int size);
 393
 394 /**********************************************************************/
 395
 396 #endif /* __NET_H__ */