include/net/ax25.h

   1 /*
   2  *      Declarations of AX.25 type objects.
   3  *
   4  *      Alan Cox (GW4PTS)       10/11/93
   5  */
   6 #ifndef _AX25_H
   7 #define _AX25_H
   8
   9 #include <linux/config.h>
  10 #include <linux/ax25.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/timer.h>
  13 #include <linux/list.h>
  14 #include <asm/atomic.h>
  15
  16 #define AX25_T1CLAMPLO                  1
  17 #define AX25_T1CLAMPHI                  (30 * HZ)
  18
  19 #define AX25_BPQ_HEADER_LEN             16
  20 #define AX25_KISS_HEADER_LEN            1
  21
  22 #define AX25_HEADER_LEN                 17
  23 #define AX25_ADDR_LEN                   7
  24 #define AX25_DIGI_HEADER_LEN            (AX25_MAX_DIGIS * AX25_ADDR_LEN)
  25 #define AX25_MAX_HEADER_LEN             (AX25_HEADER_LEN + AX25_DIGI_HEADER_LEN)
  26
  27 /* AX.25 Protocol IDs */
  28 #define AX25_P_ROSE                     0x01
  29 #define AX25_P_IP                       0xCC
  30 #define AX25_P_ARP                      0xCD
  31 #define AX25_P_TEXT                     0xF0
  32 #define AX25_P_NETROM                   0xCF
  33 #define AX25_P_SEGMENT                  0x08
  34
  35 /* AX.25 Segment control values */
  36 #define AX25_SEG_REM                    0x7F
  37 #define AX25_SEG_FIRST                  0x80
  38
  39 #define AX25_CBIT                       0x80    /* Command/Response bit */
  40 #define AX25_EBIT                       0x01    /* HDLC Address Extension bit */
  41 #define AX25_HBIT                       0x80    /* Has been repeated bit */
  42
  43 #define AX25_SSSID_SPARE                0x60    /* Unused bits in SSID for standard AX.25 */
  44 #define AX25_ESSID_SPARE                0x20    /* Unused bits in SSID for extended AX.25 */
  45 #define AX25_DAMA_FLAG                  0x20    /* Well, it is *NOT* unused! (dl1bke 951121 */
  46
  47 #define AX25_COND_ACK_PENDING           0x01
  48 #define AX25_COND_REJECT                0x02
  49 #define AX25_COND_PEER_RX_BUSY          0x04
  50 #define AX25_COND_OWN_RX_BUSY           0x08
  51 #define AX25_COND_DAMA_MODE             0x10
  52
  53 #ifndef _LINUX_NETDEVICE_H
  54 #include <linux/netdevice.h>
  55 #endif
  56
  57 /* Upper sub-layer (LAPB) definitions */
  58
  59 /* Control field templates */
  60 #define AX25_I                  0x00    /* Information frames */
  61 #define AX25_S                  0x01    /* Supervisory frames */
  62 #define AX25_RR                 0x01    /* Receiver ready */
  63 #define AX25_RNR                0x05    /* Receiver not ready */
  64 #define AX25_REJ                0x09    /* Reject */
  65 #define AX25_U                  0x03    /* Unnumbered frames */
  66 #define AX25_SABM               0x2f    /* Set Asynchronous Balanced Mode */
  67 #define AX25_SABME              0x6f    /* Set Asynchronous Balanced Mode Extended */
  68 #define AX25_DISC               0x43    /* Disconnect */
  69 #define AX25_DM                 0x0f    /* Disconnected mode */
  70 #define AX25_UA                 0x63    /* Unnumbered acknowledge */
  71 #define AX25_FRMR               0x87    /* Frame reject */
  72 #define AX25_UI                 0x03    /* Unnumbered information */
  73 #define AX25_XID                0xaf    /* Exchange information */
  74 #define AX25_TEST               0xe3    /* Test */
  75
  76 #define AX25_PF                 0x10    /* Poll/final bit for standard AX.25 */
  77 #define AX25_EPF                0x01    /* Poll/final bit for extended AX.25 */
  78
  79 #define AX25_ILLEGAL            0x100   /* Impossible to be a real frame type */
  80
  81 #define AX25_POLLOFF            0
  82 #define AX25_POLLON             1
  83
  84 /* AX25 L2 C-bit */
  85 #define AX25_COMMAND            1
  86 #define AX25_RESPONSE           2
  87
  88 /* Define Link State constants. */
  89
  90 enum {
  91         AX25_STATE_0,
  92         AX25_STATE_1,
  93         AX25_STATE_2,
  94         AX25_STATE_3,
  95         AX25_STATE_4
  96 };
  97
  98 #define AX25_MODULUS            8       /*  Standard AX.25 modulus */
  99 #define AX25_EMODULUS           128     /*  Extended AX.25 modulus */
 100
 101 enum {
 102         AX25_PROTO_STD_SIMPLEX,
 103         AX25_PROTO_STD_DUPLEX,
 104         AX25_PROTO_DAMA_SLAVE,
 105         AX25_PROTO_DAMA_MASTER
 106 };
 107
 108 enum {
 109         AX25_VALUES_IPDEFMODE,  /* 0=DG 1=VC */
 110         AX25_VALUES_AXDEFMODE,  /* 0=Normal 1=Extended Seq Nos */
 111         AX25_VALUES_BACKOFF,    /* 0=None 1=Linear 2=Exponential */
 112         AX25_VALUES_CONMODE,    /* Allow connected modes - 0=No 1=no "PID text" 2=all PIDs */
 113         AX25_VALUES_WINDOW,     /* Default window size for standard AX.25 */
 114         AX25_VALUES_EWINDOW,    /* Default window size for extended AX.25 */
 115         AX25_VALUES_T1,         /* Default T1 timeout value */
 116         AX25_VALUES_T2,         /* Default T2 timeout value */
 117         AX25_VALUES_T3,         /* Default T3 timeout value */
 118         AX25_VALUES_IDLE,       /* Connected mode idle timer */
 119         AX25_VALUES_N2,         /* Default N2 value */
 120         AX25_VALUES_PACLEN,     /* AX.25 MTU */
 121         AX25_VALUES_PROTOCOL,   /* Std AX.25, DAMA Slave, DAMA Master */
 122         AX25_VALUES_DS_TIMEOUT, /* DAMA Slave timeout */
 123         AX25_MAX_VALUES         /* THIS MUST REMAIN THE LAST ENTRY OF THIS LIST */
 124 };
 125
 126 #define AX25_DEF_IPDEFMODE      0                       /* Datagram */
 127 #define AX25_DEF_AXDEFMODE      0                       /* Normal */
 128 #define AX25_DEF_BACKOFF        1                       /* Linear backoff */
 129 #define AX25_DEF_CONMODE        2                       /* Connected mode allowed */
 130 #define AX25_DEF_WINDOW         2                       /* Window=2 */
 131 #define AX25_DEF_EWINDOW        32                      /* Module-128 Window=32 */
 132 #define AX25_DEF_T1             (10 * HZ)               /* T1=10s */
 133 #define AX25_DEF_T2             (3 * HZ)                /* T2=3s  */
 134 #define AX25_DEF_T3             (300 * HZ)              /* T3=300s */
 135 #define AX25_DEF_N2             10                      /* N2=10 */
 136 #define AX25_DEF_IDLE           (0 * 60 * HZ)           /* Idle=None */
 137 #define AX25_DEF_PACLEN         256                     /* Paclen=256 */
 138 #define AX25_DEF_PROTOCOL       AX25_PROTO_STD_SIMPLEX  /* Standard AX.25 */
 139 #define AX25_DEF_DS_TIMEOUT     (3 * 60 * HZ)           /* DAMA timeout 3 minutes */
 140
 141 typedef struct ax25_uid_assoc {
 142         struct hlist_node       uid_node;
 143         atomic_t                refcount;
 144         uid_t                   uid;
 145         ax25_address            call;
 146 } ax25_uid_assoc;
 147
 148 #define ax25_uid_for_each(__ax25, node, list) \
 149         hlist_for_each_entry(__ax25, node, list, uid_node)
 150
 151 #define ax25_uid_hold(ax25) \
 152         atomic_inc(&((ax25)->refcount))
 153
 154 static inline void ax25_uid_put(ax25_uid_assoc *assoc)
 155 {
 156         if (atomic_dec_and_test(&assoc->refcount)) {
 157                 kfree(assoc);
 158         }
 159 }
 160
 161 typedef struct {
 162         ax25_address            calls[AX25_MAX_DIGIS];
 163         unsigned char           repeated[AX25_MAX_DIGIS];
 164         unsigned char           ndigi;
 165         char                    lastrepeat;
 166 } ax25_digi;
 167
 168 typedef struct ax25_route {
 169         struct ax25_route       *next;
 170         atomic_t                ref;
 171         ax25_address            callsign;
 172         struct net_device       *dev;
 173         ax25_digi               *digipeat;
 174         char                    ip_mode;
 175         struct timer_list       timer;
 176 } ax25_route;
 177
 178 typedef struct {
 179         char                    slave;                  /* slave_mode?   */
 180         struct timer_list       slave_timer;            /* timeout timer */
 181         unsigned short          slave_timeout;          /* when? */
 182 } ax25_dama_info;
 183
 184 struct ctl_table;
 185
 186 typedef struct ax25_dev {
 187         struct ax25_dev         *next;
 188         struct net_device       *dev;
 189         struct net_device       *forward;
 190         struct ctl_table        *systable;
 191         int                     values[AX25_MAX_VALUES];
 192 #if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER)
 193         ax25_dama_info          dama;
 194 #endif
 195 } ax25_dev;
 196
 197 typedef struct ax25_cb {
 198         struct hlist_node       ax25_node;
 199         ax25_address            source_addr, dest_addr;
 200         ax25_digi               *digipeat;
 201         ax25_dev                *ax25_dev;
 202         unsigned char           iamdigi;
 203         unsigned char           state, modulus, pidincl;
 204         unsigned short          vs, vr, va;
 205         unsigned char           condition, backoff;
 206         unsigned char           n2, n2count;
 207         struct timer_list       t1timer, t2timer, t3timer, idletimer;
 208         unsigned long           t1, t2, t3, idle, rtt;
 209         unsigned short          paclen, fragno, fraglen;
 210         struct sk_buff_head     write_queue;
 211         struct sk_buff_head     reseq_queue;
 212         struct sk_buff_head     ack_queue;
 213         struct sk_buff_head     frag_queue;
 214         unsigned char           window;
 215         struct timer_list       timer, dtimer;
 216         struct sock             *sk;            /* Backlink to socket */
 217         atomic_t                refcount;
 218 } ax25_cb;
 219
 220 #define ax25_sk(__sk) ((ax25_cb *)(__sk)->sk_protinfo)
 221
 222 #define ax25_for_each(__ax25, node, list) \
 223         hlist_for_each_entry(__ax25, node, list, ax25_node)
 224
 225 #define ax25_cb_hold(__ax25) \
 226         atomic_inc(&((__ax25)->refcount))
 227
 228 static __inline__ void ax25_cb_put(ax25_cb *ax25)
 229 {
 230         if (atomic_dec_and_test(&ax25->refcount)) {
 231                 if (ax25->digipeat)
 232                         kfree(ax25->digipeat);
 233                 kfree(ax25);
 234         }
 235 }
 236
 237 static inline __be16 ax25_type_trans(struct sk_buff *skb, struct net_device *dev)
 238 {
 239         skb->dev      = dev;
 240         skb->pkt_type = PACKET_HOST;
 241         skb->mac.raw  = skb->data;
 242         return htons(ETH_P_AX25);
 243 }
 244
 245 /* af_ax25.c */
 246 extern struct hlist_head ax25_list;
 247 extern spinlock_t ax25_list_lock;
 248 extern void ax25_cb_add(ax25_cb *);
 249 struct sock *ax25_find_listener(ax25_address *, int, struct net_device *, int);
 250 struct sock *ax25_get_socket(ax25_address *, ax25_address *, int);
 251 extern ax25_cb *ax25_find_cb(ax25_address *, ax25_address *, ax25_digi *, struct net_device *);
 252 extern void ax25_send_to_raw(ax25_address *, struct sk_buff *, int);
 253 extern void ax25_destroy_socket(ax25_cb *);
 254 extern ax25_cb *ax25_create_cb(void);
 255 extern void ax25_fillin_cb(ax25_cb *, ax25_dev *);
 256 extern struct sock *ax25_make_new(struct sock *, struct ax25_dev *);
 257
 258 /* ax25_addr.c */
 259 extern ax25_address null_ax25_address;
 260 extern char *ax2asc(char *buf, ax25_address *);
 261 extern ax25_address *asc2ax(char *);
 262 extern int  ax25cmp(ax25_address *, ax25_address *);
 263 extern int  ax25digicmp(ax25_digi *, ax25_digi *);
 264 extern unsigned char *ax25_addr_parse(unsigned char *, int, ax25_address *, ax25_address *, ax25_digi *, int *, int *);
 265 extern int  ax25_addr_build(unsigned char *, ax25_address *, ax25_address *, ax25_digi *, int, int);
 266 extern int  ax25_addr_size(ax25_digi *);
 267 extern void ax25_digi_invert(ax25_digi *, ax25_digi *);
 268
 269 /* ax25_dev.c */
 270 extern ax25_dev *ax25_dev_list;
 271 extern spinlock_t ax25_dev_lock;
 272
 273 static inline ax25_dev *ax25_dev_ax25dev(struct net_device *dev)
 274 {
 275         return dev->ax25_ptr;
 276 }
 277
 278 extern ax25_dev *ax25_addr_ax25dev(ax25_address *);
 279 extern void ax25_dev_device_up(struct net_device *);
 280 extern void ax25_dev_device_down(struct net_device *);
 281 extern int  ax25_fwd_ioctl(unsigned int, struct ax25_fwd_struct *);
 282 extern struct net_device *ax25_fwd_dev(struct net_device *);
 283 extern void ax25_dev_free(void);
 284
 285 /* ax25_ds_in.c */
 286 extern int  ax25_ds_frame_in(ax25_cb *, struct sk_buff *, int);
 287
 288 /* ax25_ds_subr.c */
 289 extern void ax25_ds_nr_error_recovery(ax25_cb *);
 290 extern void ax25_ds_enquiry_response(ax25_cb *);
 291 extern void ax25_ds_establish_data_link(ax25_cb *);
 292 extern void ax25_dev_dama_off(ax25_dev *);
 293 extern void ax25_dama_on(ax25_cb *);
 294 extern void ax25_dama_off(ax25_cb *);
 295
 296 /* ax25_ds_timer.c */
 297 extern void ax25_ds_set_timer(ax25_dev *);
 298 extern void ax25_ds_del_timer(ax25_dev *);
 299 extern void ax25_ds_timer(ax25_cb *);
 300 extern void ax25_ds_t1_timeout(ax25_cb *);
 301 extern void ax25_ds_heartbeat_expiry(ax25_cb *);
 302 extern void ax25_ds_t3timer_expiry(ax25_cb *);
 303 extern void ax25_ds_idletimer_expiry(ax25_cb *);
 304
 305 /* ax25_iface.c */
 306 extern int  ax25_protocol_register(unsigned int, int (*)(struct sk_buff *, ax25_cb *));
 307 extern void ax25_protocol_release(unsigned int);
 308 extern int  ax25_linkfail_register(void (*)(ax25_cb *, int));
 309 extern void ax25_linkfail_release(void (*)(ax25_cb *, int));
 310 extern int  ax25_listen_register(ax25_address *, struct net_device *);
 311 extern void ax25_listen_release(ax25_address *, struct net_device *);
 312 extern int  (*ax25_protocol_function(unsigned int))(struct sk_buff *, ax25_cb *);
 313 extern int  ax25_listen_mine(ax25_address *, struct net_device *);
 314 extern void ax25_link_failed(ax25_cb *, int);
 315 extern int  ax25_protocol_is_registered(unsigned int);
 316
 317 /* ax25_in.c */
 318 extern int  ax25_rx_iframe(ax25_cb *, struct sk_buff *);
 319 extern int  ax25_kiss_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
 320
 321 /* ax25_ip.c */
 322 extern int  ax25_encapsulate(struct sk_buff *, struct net_device *, unsigned short, void *, void *, unsigned int);
 323 extern int  ax25_rebuild_header(struct sk_buff *);
 324
 325 /* ax25_out.c */
 326 extern ax25_cb *ax25_send_frame(struct sk_buff *, int, ax25_address *, ax25_address *, ax25_digi *, struct net_device *);
 327 extern void ax25_output(ax25_cb *, int, struct sk_buff *);
 328 extern void ax25_kick(ax25_cb *);
 329 extern void ax25_transmit_buffer(ax25_cb *, struct sk_buff *, int);
 330 extern void ax25_queue_xmit(struct sk_buff *skb, struct net_device *dev);
 331 extern int  ax25_check_iframes_acked(ax25_cb *, unsigned short);
 332
 333 /* ax25_route.c */
 334 extern void ax25_rt_device_down(struct net_device *);
 335 extern int  ax25_rt_ioctl(unsigned int, void __user *);
 336 extern struct file_operations ax25_route_fops;
 337 extern int  ax25_rt_autobind(ax25_cb *, ax25_address *);
 338 extern ax25_route *ax25_rt_find_route(ax25_route *, ax25_address *,
 339         struct net_device *);
 340 extern struct sk_buff *ax25_rt_build_path(struct sk_buff *, ax25_address *, ax25_address *, ax25_digi *);
 341 extern void ax25_rt_free(void);
 342
 343 static inline void ax25_put_route(ax25_route *ax25_rt)
 344 {
 345         atomic_dec(&ax25_rt->ref);
 346 }
 347
 348 /* ax25_std_in.c */
 349 extern int  ax25_std_frame_in(ax25_cb *, struct sk_buff *, int);
 350
 351 /* ax25_std_subr.c */
 352 extern void ax25_std_nr_error_recovery(ax25_cb *);
 353 extern void ax25_std_establish_data_link(ax25_cb *);
 354 extern void ax25_std_transmit_enquiry(ax25_cb *);
 355 extern void ax25_std_enquiry_response(ax25_cb *);
 356 extern void ax25_std_timeout_response(ax25_cb *);
 357
 358 /* ax25_std_timer.c */
 359 extern void ax25_std_heartbeat_expiry(ax25_cb *);
 360 extern void ax25_std_t1timer_expiry(ax25_cb *);
 361 extern void ax25_std_t2timer_expiry(ax25_cb *);
 362 extern void ax25_std_t3timer_expiry(ax25_cb *);
 363 extern void ax25_std_idletimer_expiry(ax25_cb *);
 364
 365 /* ax25_subr.c */
 366 extern void ax25_clear_queues(ax25_cb *);
 367 extern void ax25_frames_acked(ax25_cb *, unsigned short);
 368 extern void ax25_requeue_frames(ax25_cb *);
 369 extern int  ax25_validate_nr(ax25_cb *, unsigned short);
 370 extern int  ax25_decode(ax25_cb *, struct sk_buff *, int *, int *, int *);
 371 extern void ax25_send_control(ax25_cb *, int, int, int);
 372 extern void ax25_return_dm(struct net_device *, ax25_address *, ax25_address *, ax25_digi *);
 373 extern void ax25_calculate_t1(ax25_cb *);
 374 extern void ax25_calculate_rtt(ax25_cb *);
 375 extern void ax25_disconnect(ax25_cb *, int);
 376
 377 /* ax25_timer.c */
 378 extern void ax25_start_heartbeat(ax25_cb *);
 379 extern void ax25_start_t1timer(ax25_cb *);
 380 extern void ax25_start_t2timer(ax25_cb *);
 381 extern void ax25_start_t3timer(ax25_cb *);
 382 extern void ax25_start_idletimer(ax25_cb *);
 383 extern void ax25_stop_heartbeat(ax25_cb *);
 384 extern void ax25_stop_t1timer(ax25_cb *);
 385 extern void ax25_stop_t2timer(ax25_cb *);
 386 extern void ax25_stop_t3timer(ax25_cb *);
 387 extern void ax25_stop_idletimer(ax25_cb *);
 388 extern int  ax25_t1timer_running(ax25_cb *);
 389 extern unsigned long ax25_display_timer(struct timer_list *);
 390
 391 /* ax25_uid.c */
 392 extern int  ax25_uid_policy;
 393 extern ax25_uid_assoc *ax25_findbyuid(uid_t);
 394 extern int  ax25_uid_ioctl(int, struct sockaddr_ax25 *);
 395 extern struct file_operations ax25_uid_fops;
 396 extern void ax25_uid_free(void);
 397
 398 /* sysctl_net_ax25.c */
 399 #ifdef CONFIG_SYSCTL
 400 extern void ax25_register_sysctl(void);
 401 extern void ax25_unregister_sysctl(void);
 402 #else
 403 static inline void ax25_register_sysctl(void) {};
 404 static inline void ax25_unregister_sysctl(void) {};
 405 #endif /* CONFIG_SYSCTL */
 406
 407 #endif