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/ax25.h>
  10 #include <linux/spinlock.h>
  11 #include <linux/timer.h>
  12 #include <linux/list.h>
  13 #include <linux/slab.h>
  14 #include <linux/atomic.h>
  15 #include <net/neighbour.h>
  16 #include <net/sock.h>
  17
  18 #define AX25_T1CLAMPLO                  1
  19 #define AX25_T1CLAMPHI                  (30 * HZ)
  20
  21 #define AX25_BPQ_HEADER_LEN             16
  22 #define AX25_KISS_HEADER_LEN            1
  23
  24 #define AX25_HEADER_LEN                 17
  25 #define AX25_ADDR_LEN                   7
  26 #define AX25_DIGI_HEADER_LEN            (AX25_MAX_DIGIS * AX25_ADDR_LEN)
  27 #define AX25_MAX_HEADER_LEN             (AX25_HEADER_LEN + AX25_DIGI_HEADER_LEN)
  28
  29 /* AX.25 Protocol IDs */
  30 #define AX25_P_ROSE                     0x01
  31 #define AX25_P_VJCOMP                   0x06    /* Compressed TCP/IP packet   */
  32                                                 /* Van Jacobsen (RFC 1144)    */
  33 #define AX25_P_VJUNCOMP                 0x07    /* Uncompressed TCP/IP packet */
  34                                                 /* Van Jacobsen (RFC 1144)    */
  35 #define AX25_P_SEGMENT                  0x08    /* Segmentation fragment      */
  36 #define AX25_P_TEXNET                   0xc3    /* TEXTNET datagram protocol  */
  37 #define AX25_P_LQ                       0xc4    /* Link Quality Protocol      */
  38 #define AX25_P_ATALK                    0xca    /* Appletalk                  */
  39 #define AX25_P_ATALK_ARP                0xcb    /* Appletalk ARP              */
  40 #define AX25_P_IP                       0xcc    /* ARPA Internet Protocol     */
  41 #define AX25_P_ARP                      0xcd    /* ARPA Address Resolution    */
  42 #define AX25_P_FLEXNET                  0xce    /* FlexNet                    */
  43 #define AX25_P_NETROM                   0xcf    /* NET/ROM                    */
  44 #define AX25_P_TEXT                     0xF0    /* No layer 3 protocol impl.  */
  45
  46 /* AX.25 Segment control values */
  47 #define AX25_SEG_REM                    0x7F
  48 #define AX25_SEG_FIRST                  0x80
  49
  50 #define AX25_CBIT                       0x80    /* Command/Response bit */
  51 #define AX25_EBIT                       0x01    /* HDLC Address Extension bit */
  52 #define AX25_HBIT                       0x80    /* Has been repeated bit */
  53
  54 #define AX25_SSSID_SPARE                0x60    /* Unused bits in SSID for standard AX.25 */
  55 #define AX25_ESSID_SPARE                0x20    /* Unused bits in SSID for extended AX.25 */
  56 #define AX25_DAMA_FLAG                  0x20    /* Well, it is *NOT* unused! (dl1bke 951121 */
  57
  58 #define AX25_COND_ACK_PENDING           0x01
  59 #define AX25_COND_REJECT                0x02
  60 #define AX25_COND_PEER_RX_BUSY          0x04
  61 #define AX25_COND_OWN_RX_BUSY           0x08
  62 #define AX25_COND_DAMA_MODE             0x10
  63
  64 #ifndef _LINUX_NETDEVICE_H
  65 #include <linux/netdevice.h>
  66 #endif
  67
  68 /* Upper sub-layer (LAPB) definitions */
  69
  70 /* Control field templates */
  71 #define AX25_I                  0x00    /* Information frames */
  72 #define AX25_S                  0x01    /* Supervisory frames */
  73 #define AX25_RR                 0x01    /* Receiver ready */
  74 #define AX25_RNR                0x05    /* Receiver not ready */
  75 #define AX25_REJ                0x09    /* Reject */
  76 #define AX25_U                  0x03    /* Unnumbered frames */
  77 #define AX25_SABM               0x2f    /* Set Asynchronous Balanced Mode */
  78 #define AX25_SABME              0x6f    /* Set Asynchronous Balanced Mode Extended */
  79 #define AX25_DISC               0x43    /* Disconnect */
  80 #define AX25_DM                 0x0f    /* Disconnected mode */
  81 #define AX25_UA                 0x63    /* Unnumbered acknowledge */
  82 #define AX25_FRMR               0x87    /* Frame reject */
  83 #define AX25_UI                 0x03    /* Unnumbered information */
  84 #define AX25_XID                0xaf    /* Exchange information */
  85 #define AX25_TEST               0xe3    /* Test */
  86
  87 #define AX25_PF                 0x10    /* Poll/final bit for standard AX.25 */
  88 #define AX25_EPF                0x01    /* Poll/final bit for extended AX.25 */
  89
  90 #define AX25_ILLEGAL            0x100   /* Impossible to be a real frame type */
  91
  92 #define AX25_POLLOFF            0
  93 #define AX25_POLLON             1
  94
  95 /* AX25 L2 C-bit */
  96 #define AX25_COMMAND            1
  97 #define AX25_RESPONSE           2
  98
  99 /* Define Link State constants. */
 100
 101 enum {
 102         AX25_STATE_0,                   /* Listening */
 103         AX25_STATE_1,                   /* SABM sent */
 104         AX25_STATE_2,                   /* DISC sent */
 105         AX25_STATE_3,                   /* Established */
 106         AX25_STATE_4                    /* Recovery */
 107 };
 108
 109 #define AX25_MODULUS            8       /*  Standard AX.25 modulus */
 110 #define AX25_EMODULUS           128     /*  Extended AX.25 modulus */
 111
 112 enum {
 113         AX25_PROTO_STD_SIMPLEX,
 114         AX25_PROTO_STD_DUPLEX,
 115 #ifdef CONFIG_AX25_DAMA_SLAVE
 116         AX25_PROTO_DAMA_SLAVE,
 117 #ifdef CONFIG_AX25_DAMA_MASTER
 118         AX25_PROTO_DAMA_MASTER,
 119 #define AX25_PROTO_MAX AX25_PROTO_DAMA_MASTER
 120 #endif
 121 #endif
 122         __AX25_PROTO_MAX,
 123         AX25_PROTO_MAX = __AX25_PROTO_MAX -1
 124 };
 125
 126 enum {
 127         AX25_VALUES_IPDEFMODE,  /* 0=DG 1=VC */
 128         AX25_VALUES_AXDEFMODE,  /* 0=Normal 1=Extended Seq Nos */
 129         AX25_VALUES_BACKOFF,    /* 0=None 1=Linear 2=Exponential */
 130         AX25_VALUES_CONMODE,    /* Allow connected modes - 0=No 1=no "PID text" 2=all PIDs */
 131         AX25_VALUES_WINDOW,     /* Default window size for standard AX.25 */
 132         AX25_VALUES_EWINDOW,    /* Default window size for extended AX.25 */
 133         AX25_VALUES_T1,         /* Default T1 timeout value */
 134         AX25_VALUES_T2,         /* Default T2 timeout value */
 135         AX25_VALUES_T3,         /* Default T3 timeout value */
 136         AX25_VALUES_IDLE,       /* Connected mode idle timer */
 137         AX25_VALUES_N2,         /* Default N2 value */
 138         AX25_VALUES_PACLEN,     /* AX.25 MTU */
 139         AX25_VALUES_PROTOCOL,   /* Std AX.25, DAMA Slave, DAMA Master */
 140         AX25_VALUES_DS_TIMEOUT, /* DAMA Slave timeout */
 141         AX25_MAX_VALUES         /* THIS MUST REMAIN THE LAST ENTRY OF THIS LIST */
 142 };
 143
 144 #define AX25_DEF_IPDEFMODE      0                       /* Datagram */
 145 #define AX25_DEF_AXDEFMODE      0                       /* Normal */
 146 #define AX25_DEF_BACKOFF        1                       /* Linear backoff */
 147 #define AX25_DEF_CONMODE        2                       /* Connected mode allowed */
 148 #define AX25_DEF_WINDOW         2                       /* Window=2 */
 149 #define AX25_DEF_EWINDOW        32                      /* Module-128 Window=32 */
 150 #define AX25_DEF_T1             10000                   /* T1=10s */
 151 #define AX25_DEF_T2             3000                    /* T2=3s  */
 152 #define AX25_DEF_T3             300000                  /* T3=300s */
 153 #define AX25_DEF_N2             10                      /* N2=10 */
 154 #define AX25_DEF_IDLE           0                       /* Idle=None */
 155 #define AX25_DEF_PACLEN         256                     /* Paclen=256 */
 156 #define AX25_DEF_PROTOCOL       AX25_PROTO_STD_SIMPLEX  /* Standard AX.25 */
 157 #define AX25_DEF_DS_TIMEOUT     180000                  /* DAMA timeout 3 minutes */
 158
 159 typedef struct ax25_uid_assoc {
 160         struct hlist_node       uid_node;
 161         atomic_t                refcount;
 162         kuid_t                  uid;
 163         ax25_address            call;
 164 } ax25_uid_assoc;
 165
 166 #define ax25_uid_for_each(__ax25, list) \
 167         hlist_for_each_entry(__ax25, list, uid_node)
 168
 169 #define ax25_uid_hold(ax25) \
 170         atomic_inc(&((ax25)->refcount))
 171
 172 static inline void ax25_uid_put(ax25_uid_assoc *assoc)
 173 {
 174         if (atomic_dec_and_test(&assoc->refcount)) {
 175                 kfree(assoc);
 176         }
 177 }
 178
 179 typedef struct {
 180         ax25_address            calls[AX25_MAX_DIGIS];
 181         unsigned char           repeated[AX25_MAX_DIGIS];
 182         unsigned char           ndigi;
 183         signed char             lastrepeat;
 184 } ax25_digi;
 185
 186 typedef struct ax25_route {
 187         struct ax25_route       *next;
 188         atomic_t                refcount;
 189         ax25_address            callsign;
 190         struct net_device       *dev;
 191         ax25_digi               *digipeat;
 192         char                    ip_mode;
 193 } ax25_route;
 194
 195 static inline void ax25_hold_route(ax25_route *ax25_rt)
 196 {
 197         atomic_inc(&ax25_rt->refcount);
 198 }
 199
 200 void __ax25_put_route(ax25_route *ax25_rt);
 201
 202 static inline void ax25_put_route(ax25_route *ax25_rt)
 203 {
 204         if (atomic_dec_and_test(&ax25_rt->refcount))
 205                 __ax25_put_route(ax25_rt);
 206 }
 207
 208 typedef struct {
 209         char                    slave;                  /* slave_mode?   */
 210         struct timer_list       slave_timer;            /* timeout timer */
 211         unsigned short          slave_timeout;          /* when? */
 212 } ax25_dama_info;
 213
 214 struct ctl_table;
 215
 216 typedef struct ax25_dev {
 217         struct ax25_dev         *next;
 218         struct net_device       *dev;
 219         struct net_device       *forward;
 220         struct ctl_table_header *sysheader;
 221         int                     values[AX25_MAX_VALUES];
 222 #if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER)
 223         ax25_dama_info          dama;
 224 #endif
 225 } ax25_dev;
 226
 227 typedef struct ax25_cb {
 228         struct hlist_node       ax25_node;
 229         ax25_address            source_addr, dest_addr;
 230         ax25_digi               *digipeat;
 231         ax25_dev                *ax25_dev;
 232         unsigned char           iamdigi;
 233         unsigned char           state, modulus, pidincl;
 234         unsigned short          vs, vr, va;
 235         unsigned char           condition, backoff;
 236         unsigned char           n2, n2count;
 237         struct timer_list       t1timer, t2timer, t3timer, idletimer;
 238         unsigned long           t1, t2, t3, idle, rtt;
 239         unsigned short          paclen, fragno, fraglen;
 240         struct sk_buff_head     write_queue;
 241         struct sk_buff_head     reseq_queue;
 242         struct sk_buff_head     ack_queue;
 243         struct sk_buff_head     frag_queue;
 244         unsigned char           window;
 245         struct timer_list       timer, dtimer;
 246         struct sock             *sk;            /* Backlink to socket */
 247         atomic_t                refcount;
 248 } ax25_cb;
 249
 250 struct ax25_sock {
 251         struct sock             sk;
 252         struct ax25_cb          *cb;
 253 };
 254
 255 static inline struct ax25_sock *ax25_sk(const struct sock *sk)
 256 {
 257         return (struct ax25_sock *) sk;
 258 }
 259
 260 static inline struct ax25_cb *sk_to_ax25(const struct sock *sk)
 261 {
 262         return ax25_sk(sk)->cb;
 263 }
 264
 265 #define ax25_for_each(__ax25, list) \
 266         hlist_for_each_entry(__ax25, list, ax25_node)
 267
 268 #define ax25_cb_hold(__ax25) \
 269         atomic_inc(&((__ax25)->refcount))
 270
 271 static __inline__ void ax25_cb_put(ax25_cb *ax25)
 272 {
 273         if (atomic_dec_and_test(&ax25->refcount)) {
 274                 kfree(ax25->digipeat);
 275                 kfree(ax25);
 276         }
 277 }
 278
 279 static inline __be16 ax25_type_trans(struct sk_buff *skb, struct net_device *dev)
 280 {
 281         skb->dev      = dev;
 282         skb_reset_mac_header(skb);
 283         skb->pkt_type = PACKET_HOST;
 284         return htons(ETH_P_AX25);
 285 }
 286
 287 /* af_ax25.c */
 288 extern struct hlist_head ax25_list;
 289 extern spinlock_t ax25_list_lock;
 290 void ax25_cb_add(ax25_cb *);
 291 struct sock *ax25_find_listener(ax25_address *, int, struct net_device *, int);
 292 struct sock *ax25_get_socket(ax25_address *, ax25_address *, int);
 293 ax25_cb *ax25_find_cb(ax25_address *, ax25_address *, ax25_digi *,
 294                       struct net_device *);
 295 void ax25_send_to_raw(ax25_address *, struct sk_buff *, int);
 296 void ax25_destroy_socket(ax25_cb *);
 297 ax25_cb * __must_check ax25_create_cb(void);
 298 void ax25_fillin_cb(ax25_cb *, ax25_dev *);
 299 struct sock *ax25_make_new(struct sock *, struct ax25_dev *);
 300
 301 /* ax25_addr.c */
 302 extern const ax25_address ax25_bcast;
 303 extern const ax25_address ax25_defaddr;
 304 extern const ax25_address null_ax25_address;
 305 char *ax2asc(char *buf, const ax25_address *);
 306 void asc2ax(ax25_address *addr, const char *callsign);
 307 int ax25cmp(const ax25_address *, const ax25_address *);
 308 int ax25digicmp(const ax25_digi *, const ax25_digi *);
 309 const unsigned char *ax25_addr_parse(const unsigned char *, int,
 310         ax25_address *, ax25_address *, ax25_digi *, int *, int *);
 311 int ax25_addr_build(unsigned char *, const ax25_address *,
 312                     const ax25_address *, const ax25_digi *, int, int);
 313 int ax25_addr_size(const ax25_digi *);
 314 void ax25_digi_invert(const ax25_digi *, ax25_digi *);
 315
 316 /* ax25_dev.c */
 317 extern ax25_dev *ax25_dev_list;
 318 extern spinlock_t ax25_dev_lock;
 319
 320 static inline ax25_dev *ax25_dev_ax25dev(struct net_device *dev)
 321 {
 322         return dev->ax25_ptr;
 323 }
 324
 325 ax25_dev *ax25_addr_ax25dev(ax25_address *);
 326 void ax25_dev_device_up(struct net_device *);
 327 void ax25_dev_device_down(struct net_device *);
 328 int ax25_fwd_ioctl(unsigned int, struct ax25_fwd_struct *);
 329 struct net_device *ax25_fwd_dev(struct net_device *);
 330 void ax25_dev_free(void);
 331
 332 /* ax25_ds_in.c */
 333 int ax25_ds_frame_in(ax25_cb *, struct sk_buff *, int);
 334
 335 /* ax25_ds_subr.c */
 336 void ax25_ds_nr_error_recovery(ax25_cb *);
 337 void ax25_ds_enquiry_response(ax25_cb *);
 338 void ax25_ds_establish_data_link(ax25_cb *);
 339 void ax25_dev_dama_off(ax25_dev *);
 340 void ax25_dama_on(ax25_cb *);
 341 void ax25_dama_off(ax25_cb *);
 342
 343 /* ax25_ds_timer.c */
 344 void ax25_ds_setup_timer(ax25_dev *);
 345 void ax25_ds_set_timer(ax25_dev *);
 346 void ax25_ds_del_timer(ax25_dev *);
 347 void ax25_ds_timer(ax25_cb *);
 348 void ax25_ds_t1_timeout(ax25_cb *);
 349 void ax25_ds_heartbeat_expiry(ax25_cb *);
 350 void ax25_ds_t3timer_expiry(ax25_cb *);
 351 void ax25_ds_idletimer_expiry(ax25_cb *);
 352
 353 /* ax25_iface.c */
 354
 355 struct ax25_protocol {
 356         struct ax25_protocol *next;
 357         unsigned int pid;
 358         int (*func)(struct sk_buff *, ax25_cb *);
 359 };
 360
 361 void ax25_register_pid(struct ax25_protocol *ap);
 362 void ax25_protocol_release(unsigned int);
 363
 364 struct ax25_linkfail {
 365         struct hlist_node lf_node;
 366         void (*func)(ax25_cb *, int);
 367 };
 368
 369 void ax25_linkfail_register(struct ax25_linkfail *lf);
 370 void ax25_linkfail_release(struct ax25_linkfail *lf);
 371 int __must_check ax25_listen_register(ax25_address *, struct net_device *);
 372 void ax25_listen_release(ax25_address *, struct net_device *);
 373 int(*ax25_protocol_function(unsigned int))(struct sk_buff *, ax25_cb *);
 374 int ax25_listen_mine(ax25_address *, struct net_device *);
 375 void ax25_link_failed(ax25_cb *, int);
 376 int ax25_protocol_is_registered(unsigned int);
 377
 378 /* ax25_in.c */
 379 int ax25_rx_iframe(ax25_cb *, struct sk_buff *);
 380 int ax25_kiss_rcv(struct sk_buff *, struct net_device *, struct packet_type *,
 381                   struct net_device *);
 382
 383 /* ax25_ip.c */
 384 netdev_tx_t ax25_ip_xmit(struct sk_buff *skb);
 385 extern const struct header_ops ax25_header_ops;
 386
 387 /* ax25_out.c */
 388 ax25_cb *ax25_send_frame(struct sk_buff *, int, ax25_address *, ax25_address *,
 389                          ax25_digi *, struct net_device *);
 390 void ax25_output(ax25_cb *, int, struct sk_buff *);
 391 void ax25_kick(ax25_cb *);
 392 void ax25_transmit_buffer(ax25_cb *, struct sk_buff *, int);
 393 void ax25_queue_xmit(struct sk_buff *skb, struct net_device *dev);
 394 int ax25_check_iframes_acked(ax25_cb *, unsigned short);
 395
 396 /* ax25_route.c */
 397 void ax25_rt_device_down(struct net_device *);
 398 int ax25_rt_ioctl(unsigned int, void __user *);
 399 extern const struct file_operations ax25_route_fops;
 400 ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev);
 401 int ax25_rt_autobind(ax25_cb *, ax25_address *);
 402 struct sk_buff *ax25_rt_build_path(struct sk_buff *, ax25_address *,
 403                                    ax25_address *, ax25_digi *);
 404 void ax25_rt_free(void);
 405
 406 /* ax25_std_in.c */
 407 int ax25_std_frame_in(ax25_cb *, struct sk_buff *, int);
 408
 409 /* ax25_std_subr.c */
 410 void ax25_std_nr_error_recovery(ax25_cb *);
 411 void ax25_std_establish_data_link(ax25_cb *);
 412 void ax25_std_transmit_enquiry(ax25_cb *);
 413 void ax25_std_enquiry_response(ax25_cb *);
 414 void ax25_std_timeout_response(ax25_cb *);
 415
 416 /* ax25_std_timer.c */
 417 void ax25_std_heartbeat_expiry(ax25_cb *);
 418 void ax25_std_t1timer_expiry(ax25_cb *);
 419 void ax25_std_t2timer_expiry(ax25_cb *);
 420 void ax25_std_t3timer_expiry(ax25_cb *);
 421 void ax25_std_idletimer_expiry(ax25_cb *);
 422
 423 /* ax25_subr.c */
 424 void ax25_clear_queues(ax25_cb *);
 425 void ax25_frames_acked(ax25_cb *, unsigned short);
 426 void ax25_requeue_frames(ax25_cb *);
 427 int ax25_validate_nr(ax25_cb *, unsigned short);
 428 int ax25_decode(ax25_cb *, struct sk_buff *, int *, int *, int *);
 429 void ax25_send_control(ax25_cb *, int, int, int);
 430 void ax25_return_dm(struct net_device *, ax25_address *, ax25_address *,
 431                     ax25_digi *);
 432 void ax25_calculate_t1(ax25_cb *);
 433 void ax25_calculate_rtt(ax25_cb *);
 434 void ax25_disconnect(ax25_cb *, int);
 435
 436 /* ax25_timer.c */
 437 void ax25_setup_timers(ax25_cb *);
 438 void ax25_start_heartbeat(ax25_cb *);
 439 void ax25_start_t1timer(ax25_cb *);
 440 void ax25_start_t2timer(ax25_cb *);
 441 void ax25_start_t3timer(ax25_cb *);
 442 void ax25_start_idletimer(ax25_cb *);
 443 void ax25_stop_heartbeat(ax25_cb *);
 444 void ax25_stop_t1timer(ax25_cb *);
 445 void ax25_stop_t2timer(ax25_cb *);
 446 void ax25_stop_t3timer(ax25_cb *);
 447 void ax25_stop_idletimer(ax25_cb *);
 448 int ax25_t1timer_running(ax25_cb *);
 449 unsigned long ax25_display_timer(struct timer_list *);
 450
 451 /* ax25_uid.c */
 452 extern int  ax25_uid_policy;
 453 ax25_uid_assoc *ax25_findbyuid(kuid_t);
 454 int __must_check ax25_uid_ioctl(int, struct sockaddr_ax25 *);
 455 extern const struct file_operations ax25_uid_fops;
 456 void ax25_uid_free(void);
 457
 458 /* sysctl_net_ax25.c */
 459 #ifdef CONFIG_SYSCTL
 460 int ax25_register_dev_sysctl(ax25_dev *ax25_dev);
 461 void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev);
 462 #else
 463 static inline int ax25_register_dev_sysctl(ax25_dev *ax25_dev) { return 0; }
 464 static inline void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev) {}
 465 #endif /* CONFIG_SYSCTL */
 466
 467 #endif