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
  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_VJCOMP                   0x06    /* Compressed TCP/IP packet   */
  30                                                 /* Van Jacobsen (RFC 1144)    */
  31 #define AX25_P_VJUNCOMP                 0x07    /* Uncompressed TCP/IP packet */
  32                                                 /* Van Jacobsen (RFC 1144)    */
  33 #define AX25_P_SEGMENT                  0x08    /* Segmentation fragment      */
  34 #define AX25_P_TEXNET                   0xc3    /* TEXTNET datagram protocol  */
  35 #define AX25_P_LQ                       0xc4    /* Link Quality Protocol      */
  36 #define AX25_P_ATALK                    0xca    /* Appletalk                  */
  37 #define AX25_P_ATALK_ARP                0xcb    /* Appletalk ARP              */
  38 #define AX25_P_IP                       0xcc    /* ARPA Internet Protocol     */
  39 #define AX25_P_ARP                      0xcd    /* ARPA Address Resolution    */
  40 #define AX25_P_FLEXNET                  0xce    /* FlexNet                    */
  41 #define AX25_P_NETROM                   0xcf    /* NET/ROM                    */
  42 #define AX25_P_TEXT                     0xF0    /* No layer 3 protocol impl.  */
  43
  44 /* AX.25 Segment control values */
  45 #define AX25_SEG_REM                    0x7F
  46 #define AX25_SEG_FIRST                  0x80
  47
  48 #define AX25_CBIT                       0x80    /* Command/Response bit */
  49 #define AX25_EBIT                       0x01    /* HDLC Address Extension bit */
  50 #define AX25_HBIT                       0x80    /* Has been repeated bit */
  51
  52 #define AX25_SSSID_SPARE                0x60    /* Unused bits in SSID for standard AX.25 */
  53 #define AX25_ESSID_SPARE                0x20    /* Unused bits in SSID for extended AX.25 */
  54 #define AX25_DAMA_FLAG                  0x20    /* Well, it is *NOT* unused! (dl1bke 951121 */
  55
  56 #define AX25_COND_ACK_PENDING           0x01
  57 #define AX25_COND_REJECT                0x02
  58 #define AX25_COND_PEER_RX_BUSY          0x04
  59 #define AX25_COND_OWN_RX_BUSY           0x08
  60 #define AX25_COND_DAMA_MODE             0x10
  61
  62 #ifndef _LINUX_NETDEVICE_H
  63 #include <linux/netdevice.h>
  64 #endif
  65
  66 /* Upper sub-layer (LAPB) definitions */
  67
  68 /* Control field templates */
  69 #define AX25_I                  0x00    /* Information frames */
  70 #define AX25_S                  0x01    /* Supervisory frames */
  71 #define AX25_RR                 0x01    /* Receiver ready */
  72 #define AX25_RNR                0x05    /* Receiver not ready */
  73 #define AX25_REJ                0x09    /* Reject */
  74 #define AX25_U                  0x03    /* Unnumbered frames */
  75 #define AX25_SABM               0x2f    /* Set Asynchronous Balanced Mode */
  76 #define AX25_SABME              0x6f    /* Set Asynchronous Balanced Mode Extended */
  77 #define AX25_DISC               0x43    /* Disconnect */
  78 #define AX25_DM                 0x0f    /* Disconnected mode */
  79 #define AX25_UA                 0x63    /* Unnumbered acknowledge */
  80 #define AX25_FRMR               0x87    /* Frame reject */
  81 #define AX25_UI                 0x03    /* Unnumbered information */
  82 #define AX25_XID                0xaf    /* Exchange information */
  83 #define AX25_TEST               0xe3    /* Test */
  84
  85 #define AX25_PF                 0x10    /* Poll/final bit for standard AX.25 */
  86 #define AX25_EPF                0x01    /* Poll/final bit for extended AX.25 */
  87
  88 #define AX25_ILLEGAL            0x100   /* Impossible to be a real frame type */
  89
  90 #define AX25_POLLOFF            0
  91 #define AX25_POLLON             1
  92
  93 /* AX25 L2 C-bit */
  94 #define AX25_COMMAND            1
  95 #define AX25_RESPONSE           2
  96
  97 /* Define Link State constants. */
  98
  99 enum {
 100         AX25_STATE_0,                   /* Listening */
 101         AX25_STATE_1,                   /* SABM sent */
 102         AX25_STATE_2,                   /* DISC sent */
 103         AX25_STATE_3,                   /* Established */
 104         AX25_STATE_4                    /* Recovery */
 105 };
 106
 107 #define AX25_MODULUS            8       /*  Standard AX.25 modulus */
 108 #define AX25_EMODULUS           128     /*  Extended AX.25 modulus */
 109
 110 enum {
 111         AX25_PROTO_STD_SIMPLEX,
 112         AX25_PROTO_STD_DUPLEX,
 113 #ifdef CONFIG_AX25_DAMA_SLAVE
 114         AX25_PROTO_DAMA_SLAVE,
 115 #ifdef CONFIG_AX25_DAMA_MASTER
 116         AX25_PROTO_DAMA_MASTER,
 117 #define AX25_PROTO_MAX AX25_PROTO_DAMA_MASTER
 118 #endif
 119 #endif
 120         __AX25_PROTO_MAX,
 121         AX25_PROTO_MAX = __AX25_PROTO_MAX -1
 122 };
 123
 124 enum {
 125         AX25_VALUES_IPDEFMODE,  /* 0=DG 1=VC */
 126         AX25_VALUES_AXDEFMODE,  /* 0=Normal 1=Extended Seq Nos */
 127         AX25_VALUES_BACKOFF,    /* 0=None 1=Linear 2=Exponential */
 128         AX25_VALUES_CONMODE,    /* Allow connected modes - 0=No 1=no "PID text" 2=all PIDs */
 129         AX25_VALUES_WINDOW,     /* Default window size for standard AX.25 */
 130         AX25_VALUES_EWINDOW,    /* Default window size for extended AX.25 */
 131         AX25_VALUES_T1,         /* Default T1 timeout value */
 132         AX25_VALUES_T2,         /* Default T2 timeout value */
 133         AX25_VALUES_T3,         /* Default T3 timeout value */
 134         AX25_VALUES_IDLE,       /* Connected mode idle timer */
 135         AX25_VALUES_N2,         /* Default N2 value */
 136         AX25_VALUES_PACLEN,     /* AX.25 MTU */
 137         AX25_VALUES_PROTOCOL,   /* Std AX.25, DAMA Slave, DAMA Master */
 138         AX25_VALUES_DS_TIMEOUT, /* DAMA Slave timeout */
 139         AX25_MAX_VALUES         /* THIS MUST REMAIN THE LAST ENTRY OF THIS LIST */
 140 };
 141
 142 #define AX25_DEF_IPDEFMODE      0                       /* Datagram */
 143 #define AX25_DEF_AXDEFMODE      0                       /* Normal */
 144 #define AX25_DEF_BACKOFF        1                       /* Linear backoff */
 145 #define AX25_DEF_CONMODE        2                       /* Connected mode allowed */
 146 #define AX25_DEF_WINDOW         2                       /* Window=2 */
 147 #define AX25_DEF_EWINDOW        32                      /* Module-128 Window=32 */
 148 #define AX25_DEF_T1             10000                   /* T1=10s */
 149 #define AX25_DEF_T2             3000                    /* T2=3s  */
 150 #define AX25_DEF_T3             300000                  /* T3=300s */
 151 #define AX25_DEF_N2             10                      /* N2=10 */
 152 #define AX25_DEF_IDLE           0                       /* Idle=None */
 153 #define AX25_DEF_PACLEN         256                     /* Paclen=256 */
 154 #define AX25_DEF_PROTOCOL       AX25_PROTO_STD_SIMPLEX  /* Standard AX.25 */
 155 #define AX25_DEF_DS_TIMEOUT     180000                  /* DAMA timeout 3 minutes */
 156
 157 typedef struct ax25_uid_assoc {
 158         struct hlist_node       uid_node;
 159         atomic_t                refcount;
 160         kuid_t                  uid;
 161         ax25_address            call;
 162 } ax25_uid_assoc;
 163
 164 #define ax25_uid_for_each(__ax25, node, list) \
 165         hlist_for_each_entry(__ax25, node, list, uid_node)
 166
 167 #define ax25_uid_hold(ax25) \
 168         atomic_inc(&((ax25)->refcount))
 169
 170 static inline void ax25_uid_put(ax25_uid_assoc *assoc)
 171 {
 172         if (atomic_dec_and_test(&assoc->refcount)) {
 173                 kfree(assoc);
 174         }
 175 }
 176
 177 typedef struct {
 178         ax25_address            calls[AX25_MAX_DIGIS];
 179         unsigned char           repeated[AX25_MAX_DIGIS];
 180         unsigned char           ndigi;
 181         signed char             lastrepeat;
 182 } ax25_digi;
 183
 184 typedef struct ax25_route {
 185         struct ax25_route       *next;
 186         atomic_t                refcount;
 187         ax25_address            callsign;
 188         struct net_device       *dev;
 189         ax25_digi               *digipeat;
 190         char                    ip_mode;
 191 } ax25_route;
 192
 193 static inline void ax25_hold_route(ax25_route *ax25_rt)
 194 {
 195         atomic_inc(&ax25_rt->refcount);
 196 }
 197
 198 extern void __ax25_put_route(ax25_route *ax25_rt);
 199
 200 static inline void ax25_put_route(ax25_route *ax25_rt)
 201 {
 202         if (atomic_dec_and_test(&ax25_rt->refcount))
 203                 __ax25_put_route(ax25_rt);
 204 }
 205
 206 typedef struct {
 207         char                    slave;                  /* slave_mode?   */
 208         struct timer_list       slave_timer;            /* timeout timer */
 209         unsigned short          slave_timeout;          /* when? */
 210 } ax25_dama_info;
 211
 212 struct ctl_table;
 213
 214 typedef struct ax25_dev {
 215         struct ax25_dev         *next;
 216         struct net_device       *dev;
 217         struct net_device       *forward;
 218         struct ctl_table_header *sysheader;
 219         int                     values[AX25_MAX_VALUES];
 220 #if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER)
 221         ax25_dama_info          dama;
 222 #endif
 223 } ax25_dev;
 224
 225 typedef struct ax25_cb {
 226         struct hlist_node       ax25_node;
 227         ax25_address            source_addr, dest_addr;
 228         ax25_digi               *digipeat;
 229         ax25_dev                *ax25_dev;
 230         unsigned char           iamdigi;
 231         unsigned char           state, modulus, pidincl;
 232         unsigned short          vs, vr, va;
 233         unsigned char           condition, backoff;
 234         unsigned char           n2, n2count;
 235         struct timer_list       t1timer, t2timer, t3timer, idletimer;
 236         unsigned long           t1, t2, t3, idle, rtt;
 237         unsigned short          paclen, fragno, fraglen;
 238         struct sk_buff_head     write_queue;
 239         struct sk_buff_head     reseq_queue;
 240         struct sk_buff_head     ack_queue;
 241         struct sk_buff_head     frag_queue;
 242         unsigned char           window;
 243         struct timer_list       timer, dtimer;
 244         struct sock             *sk;            /* Backlink to socket */
 245         atomic_t                refcount;
 246 } ax25_cb;
 247
 248 #define ax25_sk(__sk) ((ax25_cb *)(__sk)->sk_protinfo)
 249
 250 #define ax25_for_each(__ax25, node, list) \
 251         hlist_for_each_entry(__ax25, node, list, ax25_node)
 252
 253 #define ax25_cb_hold(__ax25) \
 254         atomic_inc(&((__ax25)->refcount))
 255
 256 static __inline__ void ax25_cb_put(ax25_cb *ax25)
 257 {
 258         if (atomic_dec_and_test(&ax25->refcount)) {
 259                 kfree(ax25->digipeat);
 260                 kfree(ax25);
 261         }
 262 }
 263
 264 static inline __be16 ax25_type_trans(struct sk_buff *skb, struct net_device *dev)
 265 {
 266         skb->dev      = dev;
 267         skb_reset_mac_header(skb);
 268         skb->pkt_type = PACKET_HOST;
 269         return htons(ETH_P_AX25);
 270 }
 271
 272 /* af_ax25.c */
 273 extern struct hlist_head ax25_list;
 274 extern spinlock_t ax25_list_lock;
 275 extern void ax25_cb_add(ax25_cb *);
 276 struct sock *ax25_find_listener(ax25_address *, int, struct net_device *, int);
 277 struct sock *ax25_get_socket(ax25_address *, ax25_address *, int);
 278 extern ax25_cb *ax25_find_cb(ax25_address *, ax25_address *, ax25_digi *, struct net_device *);
 279 extern void ax25_send_to_raw(ax25_address *, struct sk_buff *, int);
 280 extern void ax25_destroy_socket(ax25_cb *);
 281 extern ax25_cb * __must_check ax25_create_cb(void);
 282 extern void ax25_fillin_cb(ax25_cb *, ax25_dev *);
 283 extern struct sock *ax25_make_new(struct sock *, struct ax25_dev *);
 284
 285 /* ax25_addr.c */
 286 extern const ax25_address ax25_bcast;
 287 extern const ax25_address ax25_defaddr;
 288 extern const ax25_address null_ax25_address;
 289 extern char *ax2asc(char *buf, const ax25_address *);
 290 extern void asc2ax(ax25_address *addr, const char *callsign);
 291 extern int ax25cmp(const ax25_address *, const ax25_address *);
 292 extern int ax25digicmp(const ax25_digi *, const ax25_digi *);
 293 extern const unsigned char *ax25_addr_parse(const unsigned char *, int,
 294         ax25_address *, ax25_address *, ax25_digi *, int *, int *);
 295 extern int  ax25_addr_build(unsigned char *, const ax25_address *,
 296         const ax25_address *, const ax25_digi *, int, int);
 297 extern int  ax25_addr_size(const ax25_digi *);
 298 extern void ax25_digi_invert(const ax25_digi *, ax25_digi *);
 299
 300 /* ax25_dev.c */
 301 extern ax25_dev *ax25_dev_list;
 302 extern spinlock_t ax25_dev_lock;
 303
 304 static inline ax25_dev *ax25_dev_ax25dev(struct net_device *dev)
 305 {
 306         return dev->ax25_ptr;
 307 }
 308
 309 extern ax25_dev *ax25_addr_ax25dev(ax25_address *);
 310 extern void ax25_dev_device_up(struct net_device *);
 311 extern void ax25_dev_device_down(struct net_device *);
 312 extern int  ax25_fwd_ioctl(unsigned int, struct ax25_fwd_struct *);
 313 extern struct net_device *ax25_fwd_dev(struct net_device *);
 314 extern void ax25_dev_free(void);
 315
 316 /* ax25_ds_in.c */
 317 extern int  ax25_ds_frame_in(ax25_cb *, struct sk_buff *, int);
 318
 319 /* ax25_ds_subr.c */
 320 extern void ax25_ds_nr_error_recovery(ax25_cb *);
 321 extern void ax25_ds_enquiry_response(ax25_cb *);
 322 extern void ax25_ds_establish_data_link(ax25_cb *);
 323 extern void ax25_dev_dama_off(ax25_dev *);
 324 extern void ax25_dama_on(ax25_cb *);
 325 extern void ax25_dama_off(ax25_cb *);
 326
 327 /* ax25_ds_timer.c */
 328 extern void ax25_ds_setup_timer(ax25_dev *);
 329 extern void ax25_ds_set_timer(ax25_dev *);
 330 extern void ax25_ds_del_timer(ax25_dev *);
 331 extern void ax25_ds_timer(ax25_cb *);
 332 extern void ax25_ds_t1_timeout(ax25_cb *);
 333 extern void ax25_ds_heartbeat_expiry(ax25_cb *);
 334 extern void ax25_ds_t3timer_expiry(ax25_cb *);
 335 extern void ax25_ds_idletimer_expiry(ax25_cb *);
 336
 337 /* ax25_iface.c */
 338
 339 struct ax25_protocol {
 340         struct ax25_protocol *next;
 341         unsigned int pid;
 342         int (*func)(struct sk_buff *, ax25_cb *);
 343 };
 344
 345 extern void ax25_register_pid(struct ax25_protocol *ap);
 346 extern void ax25_protocol_release(unsigned int);
 347
 348 struct ax25_linkfail {
 349         struct hlist_node lf_node;
 350         void (*func)(ax25_cb *, int);
 351 };
 352
 353 extern void ax25_linkfail_register(struct ax25_linkfail *lf);
 354 extern void ax25_linkfail_release(struct ax25_linkfail *lf);
 355 extern int __must_check ax25_listen_register(ax25_address *,
 356         struct net_device *);
 357 extern void ax25_listen_release(ax25_address *, struct net_device *);
 358 extern int  (*ax25_protocol_function(unsigned int))(struct sk_buff *, ax25_cb *);
 359 extern int  ax25_listen_mine(ax25_address *, struct net_device *);
 360 extern void ax25_link_failed(ax25_cb *, int);
 361 extern int  ax25_protocol_is_registered(unsigned int);
 362
 363 /* ax25_in.c */
 364 extern int  ax25_rx_iframe(ax25_cb *, struct sk_buff *);
 365 extern int  ax25_kiss_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
 366
 367 /* ax25_ip.c */
 368 extern int ax25_hard_header(struct sk_buff *, struct net_device *,
 369                             unsigned short, const void *,
 370                             const void *, unsigned int);
 371 extern int  ax25_rebuild_header(struct sk_buff *);
 372 extern const struct header_ops ax25_header_ops;
 373
 374 /* ax25_out.c */
 375 extern ax25_cb *ax25_send_frame(struct sk_buff *, int, ax25_address *, ax25_address *, ax25_digi *, struct net_device *);
 376 extern void ax25_output(ax25_cb *, int, struct sk_buff *);
 377 extern void ax25_kick(ax25_cb *);
 378 extern void ax25_transmit_buffer(ax25_cb *, struct sk_buff *, int);
 379 extern void ax25_queue_xmit(struct sk_buff *skb, struct net_device *dev);
 380 extern int  ax25_check_iframes_acked(ax25_cb *, unsigned short);
 381
 382 /* ax25_route.c */
 383 extern void ax25_rt_device_down(struct net_device *);
 384 extern int  ax25_rt_ioctl(unsigned int, void __user *);
 385 extern const struct file_operations ax25_route_fops;
 386 extern ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev);
 387 extern int  ax25_rt_autobind(ax25_cb *, ax25_address *);
 388 extern struct sk_buff *ax25_rt_build_path(struct sk_buff *, ax25_address *, ax25_address *, ax25_digi *);
 389 extern void ax25_rt_free(void);
 390
 391 /* ax25_std_in.c */
 392 extern int  ax25_std_frame_in(ax25_cb *, struct sk_buff *, int);
 393
 394 /* ax25_std_subr.c */
 395 extern void ax25_std_nr_error_recovery(ax25_cb *);
 396 extern void ax25_std_establish_data_link(ax25_cb *);
 397 extern void ax25_std_transmit_enquiry(ax25_cb *);
 398 extern void ax25_std_enquiry_response(ax25_cb *);
 399 extern void ax25_std_timeout_response(ax25_cb *);
 400
 401 /* ax25_std_timer.c */
 402 extern void ax25_std_heartbeat_expiry(ax25_cb *);
 403 extern void ax25_std_t1timer_expiry(ax25_cb *);
 404 extern void ax25_std_t2timer_expiry(ax25_cb *);
 405 extern void ax25_std_t3timer_expiry(ax25_cb *);
 406 extern void ax25_std_idletimer_expiry(ax25_cb *);
 407
 408 /* ax25_subr.c */
 409 extern void ax25_clear_queues(ax25_cb *);
 410 extern void ax25_frames_acked(ax25_cb *, unsigned short);
 411 extern void ax25_requeue_frames(ax25_cb *);
 412 extern int  ax25_validate_nr(ax25_cb *, unsigned short);
 413 extern int  ax25_decode(ax25_cb *, struct sk_buff *, int *, int *, int *);
 414 extern void ax25_send_control(ax25_cb *, int, int, int);
 415 extern void ax25_return_dm(struct net_device *, ax25_address *, ax25_address *, ax25_digi *);
 416 extern void ax25_calculate_t1(ax25_cb *);
 417 extern void ax25_calculate_rtt(ax25_cb *);
 418 extern void ax25_disconnect(ax25_cb *, int);
 419
 420 /* ax25_timer.c */
 421 extern void ax25_setup_timers(ax25_cb *);
 422 extern void ax25_start_heartbeat(ax25_cb *);
 423 extern void ax25_start_t1timer(ax25_cb *);
 424 extern void ax25_start_t2timer(ax25_cb *);
 425 extern void ax25_start_t3timer(ax25_cb *);
 426 extern void ax25_start_idletimer(ax25_cb *);
 427 extern void ax25_stop_heartbeat(ax25_cb *);
 428 extern void ax25_stop_t1timer(ax25_cb *);
 429 extern void ax25_stop_t2timer(ax25_cb *);
 430 extern void ax25_stop_t3timer(ax25_cb *);
 431 extern void ax25_stop_idletimer(ax25_cb *);
 432 extern int  ax25_t1timer_running(ax25_cb *);
 433 extern unsigned long ax25_display_timer(struct timer_list *);
 434
 435 /* ax25_uid.c */
 436 extern int  ax25_uid_policy;
 437 extern ax25_uid_assoc *ax25_findbyuid(kuid_t);
 438 extern int __must_check ax25_uid_ioctl(int, struct sockaddr_ax25 *);
 439 extern const struct file_operations ax25_uid_fops;
 440 extern void ax25_uid_free(void);
 441
 442 /* sysctl_net_ax25.c */
 443 #ifdef CONFIG_SYSCTL
 444 extern int ax25_register_dev_sysctl(ax25_dev *ax25_dev);
 445 extern void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev);
 446 #else
 447 static inline int ax25_register_dev_sysctl(ax25_dev *ax25_dev) { return 0; }
 448 static inline void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev) {}
 449 #endif /* CONFIG_SYSCTL */
 450
 451 #endif