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 <asm/atomic.h> 14 15 #define AX25_T1CLAMPLO 1 16 #define AX25_T1CLAMPHI (30 * HZ) 17 18 #define AX25_BPQ_HEADER_LEN 16 19 #define AX25_KISS_HEADER_LEN 1 20 21 #define AX25_HEADER_LEN 17 22 #define AX25_ADDR_LEN 7 23 #define AX25_DIGI_HEADER_LEN (AX25_MAX_DIGIS * AX25_ADDR_LEN) 24 #define AX25_MAX_HEADER_LEN (AX25_HEADER_LEN + AX25_DIGI_HEADER_LEN) 25 26 /* AX.25 Protocol IDs */ 27 #define AX25_P_ROSE 0x01 28 #define AX25_P_VJCOMP 0x06 /* Compressed TCP/IP packet */ 29 /* Van Jacobsen (RFC 1144) */ 30 #define AX25_P_VJUNCOMP 0x07 /* Uncompressed TCP/IP packet */ 31 /* Van Jacobsen (RFC 1144) */ 32 #define AX25_P_SEGMENT 0x08 /* Segmentation fragment */ 33 #define AX25_P_TEXNET 0xc3 /* TEXTNET datagram protocol */ 34 #define AX25_P_LQ 0xc4 /* Link Quality Protocol */ 35 #define AX25_P_ATALK 0xca /* Appletalk */ 36 #define AX25_P_ATALK_ARP 0xcb /* Appletalk ARP */ 37 #define AX25_P_IP 0xcc /* ARPA Internet Protocol */ 38 #define AX25_P_ARP 0xcd /* ARPA Address Resolution */ 39 #define AX25_P_FLEXNET 0xce /* FlexNet */ 40 #define AX25_P_NETROM 0xcf /* NET/ROM */ 41 #define AX25_P_TEXT 0xF0 /* No layer 3 protocol impl. */ 42 43 /* AX.25 Segment control values */ 44 #define AX25_SEG_REM 0x7F 45 #define AX25_SEG_FIRST 0x80 46 47 #define AX25_CBIT 0x80 /* Command/Response bit */ 48 #define AX25_EBIT 0x01 /* HDLC Address Extension bit */ 49 #define AX25_HBIT 0x80 /* Has been repeated bit */ 50 51 #define AX25_SSSID_SPARE 0x60 /* Unused bits in SSID for standard AX.25 */ 52 #define AX25_ESSID_SPARE 0x20 /* Unused bits in SSID for extended AX.25 */ 53 #define AX25_DAMA_FLAG 0x20 /* Well, it is *NOT* unused! (dl1bke 951121 */ 54 55 #define AX25_COND_ACK_PENDING 0x01 56 #define AX25_COND_REJECT 0x02 57 #define AX25_COND_PEER_RX_BUSY 0x04 58 #define AX25_COND_OWN_RX_BUSY 0x08 59 #define AX25_COND_DAMA_MODE 0x10 60 61 #ifndef _LINUX_NETDEVICE_H 62 #include <linux/netdevice.h> 63 #endif 64 65 /* Upper sub-layer (LAPB) definitions */ 66 67 /* Control field templates */ 68 #define AX25_I 0x00 /* Information frames */ 69 #define AX25_S 0x01 /* Supervisory frames */ 70 #define AX25_RR 0x01 /* Receiver ready */ 71 #define AX25_RNR 0x05 /* Receiver not ready */ 72 #define AX25_REJ 0x09 /* Reject */ 73 #define AX25_U 0x03 /* Unnumbered frames */ 74 #define AX25_SABM 0x2f /* Set Asynchronous Balanced Mode */ 75 #define AX25_SABME 0x6f /* Set Asynchronous Balanced Mode Extended */ 76 #define AX25_DISC 0x43 /* Disconnect */ 77 #define AX25_DM 0x0f /* Disconnected mode */ 78 #define AX25_UA 0x63 /* Unnumbered acknowledge */ 79 #define AX25_FRMR 0x87 /* Frame reject */ 80 #define AX25_UI 0x03 /* Unnumbered information */ 81 #define AX25_XID 0xaf /* Exchange information */ 82 #define AX25_TEST 0xe3 /* Test */ 83 84 #define AX25_PF 0x10 /* Poll/final bit for standard AX.25 */ 85 #define AX25_EPF 0x01 /* Poll/final bit for extended AX.25 */ 86 87 #define AX25_ILLEGAL 0x100 /* Impossible to be a real frame type */ 88 89 #define AX25_POLLOFF 0 90 #define AX25_POLLON 1 91 92 /* AX25 L2 C-bit */ 93 #define AX25_COMMAND 1 94 #define AX25_RESPONSE 2 95 96 /* Define Link State constants. */ 97 98 enum { 99 AX25_STATE_0, /* Listening */ 100 AX25_STATE_1, /* SABM sent */ 101 AX25_STATE_2, /* DISC sent */ 102 AX25_STATE_3, /* Established */ 103 AX25_STATE_4 /* Recovery */ 104 }; 105 106 #define AX25_MODULUS 8 /* Standard AX.25 modulus */ 107 #define AX25_EMODULUS 128 /* Extended AX.25 modulus */ 108 109 enum { 110 AX25_PROTO_STD_SIMPLEX, 111 AX25_PROTO_STD_DUPLEX, 112 #ifdef CONFIG_AX25_DAMA_SLAVE 113 AX25_PROTO_DAMA_SLAVE, 114 #ifdef CONFIG_AX25_DAMA_MASTER 115 AX25_PROTO_DAMA_MASTER, 116 #define AX25_PROTO_MAX AX25_PROTO_DAMA_MASTER 117 #endif 118 #endif 119 __AX25_PROTO_MAX, 120 AX25_PROTO_MAX = __AX25_PROTO_MAX -1 121 }; 122 123 enum { 124 AX25_VALUES_IPDEFMODE, /* 0=DG 1=VC */ 125 AX25_VALUES_AXDEFMODE, /* 0=Normal 1=Extended Seq Nos */ 126 AX25_VALUES_BACKOFF, /* 0=None 1=Linear 2=Exponential */ 127 AX25_VALUES_CONMODE, /* Allow connected modes - 0=No 1=no "PID text" 2=all PIDs */ 128 AX25_VALUES_WINDOW, /* Default window size for standard AX.25 */ 129 AX25_VALUES_EWINDOW, /* Default window size for extended AX.25 */ 130 AX25_VALUES_T1, /* Default T1 timeout value */ 131 AX25_VALUES_T2, /* Default T2 timeout value */ 132 AX25_VALUES_T3, /* Default T3 timeout value */ 133 AX25_VALUES_IDLE, /* Connected mode idle timer */ 134 AX25_VALUES_N2, /* Default N2 value */ 135 AX25_VALUES_PACLEN, /* AX.25 MTU */ 136 AX25_VALUES_PROTOCOL, /* Std AX.25, DAMA Slave, DAMA Master */ 137 AX25_VALUES_DS_TIMEOUT, /* DAMA Slave timeout */ 138 AX25_MAX_VALUES /* THIS MUST REMAIN THE LAST ENTRY OF THIS LIST */ 139 }; 140 141 #define AX25_DEF_IPDEFMODE 0 /* Datagram */ 142 #define AX25_DEF_AXDEFMODE 0 /* Normal */ 143 #define AX25_DEF_BACKOFF 1 /* Linear backoff */ 144 #define AX25_DEF_CONMODE 2 /* Connected mode allowed */ 145 #define AX25_DEF_WINDOW 2 /* Window=2 */ 146 #define AX25_DEF_EWINDOW 32 /* Module-128 Window=32 */ 147 #define AX25_DEF_T1 10000 /* T1=10s */ 148 #define AX25_DEF_T2 3000 /* T2=3s */ 149 #define AX25_DEF_T3 300000 /* T3=300s */ 150 #define AX25_DEF_N2 10 /* N2=10 */ 151 #define AX25_DEF_IDLE 0 /* Idle=None */ 152 #define AX25_DEF_PACLEN 256 /* Paclen=256 */ 153 #define AX25_DEF_PROTOCOL AX25_PROTO_STD_SIMPLEX /* Standard AX.25 */ 154 #define AX25_DEF_DS_TIMEOUT 180000 /* DAMA timeout 3 minutes */ 155 156 typedef struct ax25_uid_assoc { 157 struct hlist_node uid_node; 158 atomic_t refcount; 159 uid_t uid; 160 ax25_address call; 161 } ax25_uid_assoc; 162 163 #define ax25_uid_for_each(__ax25, node, list) \ 164 hlist_for_each_entry(__ax25, node, list, uid_node) 165 166 #define ax25_uid_hold(ax25) \ 167 atomic_inc(&((ax25)->refcount)) 168 169 static inline void ax25_uid_put(ax25_uid_assoc *assoc) 170 { 171 if (atomic_dec_and_test(&assoc->refcount)) { 172 kfree(assoc); 173 } 174 } 175 176 typedef struct { 177 ax25_address calls[AX25_MAX_DIGIS]; 178 unsigned char repeated[AX25_MAX_DIGIS]; 179 unsigned char ndigi; 180 signed char lastrepeat; 181 } ax25_digi; 182 183 typedef struct ax25_route { 184 struct ax25_route *next; 185 atomic_t refcount; 186 ax25_address callsign; 187 struct net_device *dev; 188 ax25_digi *digipeat; 189 char ip_mode; 190 } ax25_route; 191 192 static inline void ax25_hold_route(ax25_route *ax25_rt) 193 { 194 atomic_inc(&ax25_rt->refcount); 195 } 196 197 extern void __ax25_put_route(ax25_route *ax25_rt); 198 199 static inline void ax25_put_route(ax25_route *ax25_rt) 200 { 201 if (atomic_dec_and_test(&ax25_rt->refcount)) 202 __ax25_put_route(ax25_rt); 203 } 204 205 typedef struct { 206 char slave; /* slave_mode? */ 207 struct timer_list slave_timer; /* timeout timer */ 208 unsigned short slave_timeout; /* when? */ 209 } ax25_dama_info; 210 211 struct ctl_table; 212 213 typedef struct ax25_dev { 214 struct ax25_dev *next; 215 struct net_device *dev; 216 struct net_device *forward; 217 struct ctl_table *systable; 218 int values[AX25_MAX_VALUES]; 219 #if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER) 220 ax25_dama_info dama; 221 #endif 222 } ax25_dev; 223 224 typedef struct ax25_cb { 225 struct hlist_node ax25_node; 226 ax25_address source_addr, dest_addr; 227 ax25_digi *digipeat; 228 ax25_dev *ax25_dev; 229 unsigned char iamdigi; 230 unsigned char state, modulus, pidincl; 231 unsigned short vs, vr, va; 232 unsigned char condition, backoff; 233 unsigned char n2, n2count; 234 struct timer_list t1timer, t2timer, t3timer, idletimer; 235 unsigned long t1, t2, t3, idle, rtt; 236 unsigned short paclen, fragno, fraglen; 237 struct sk_buff_head write_queue; 238 struct sk_buff_head reseq_queue; 239 struct sk_buff_head ack_queue; 240 struct sk_buff_head frag_queue; 241 unsigned char window; 242 struct timer_list timer, dtimer; 243 struct sock *sk; /* Backlink to socket */ 244 atomic_t refcount; 245 } ax25_cb; 246 247 #define ax25_sk(__sk) ((ax25_cb *)(__sk)->sk_protinfo) 248 249 #define ax25_for_each(__ax25, node, list) \ 250 hlist_for_each_entry(__ax25, node, list, ax25_node) 251 252 #define ax25_cb_hold(__ax25) \ 253 atomic_inc(&((__ax25)->refcount)) 254 255 static __inline__ void ax25_cb_put(ax25_cb *ax25) 256 { 257 if (atomic_dec_and_test(&ax25->refcount)) { 258 kfree(ax25->digipeat); 259 kfree(ax25); 260 } 261 } 262 263 static inline __be16 ax25_type_trans(struct sk_buff *skb, struct net_device *dev) 264 { 265 skb->dev = dev; 266 skb_reset_mac_header(skb); 267 skb->pkt_type = PACKET_HOST; 268 return htons(ETH_P_AX25); 269 } 270 271 /* af_ax25.c */ 272 extern struct hlist_head ax25_list; 273 extern spinlock_t ax25_list_lock; 274 extern void ax25_cb_add(ax25_cb *); 275 struct sock *ax25_find_listener(ax25_address *, int, struct net_device *, int); 276 struct sock *ax25_get_socket(ax25_address *, ax25_address *, int); 277 extern ax25_cb *ax25_find_cb(ax25_address *, ax25_address *, ax25_digi *, struct net_device *); 278 extern void ax25_send_to_raw(ax25_address *, struct sk_buff *, int); 279 extern void ax25_destroy_socket(ax25_cb *); 280 extern ax25_cb * __must_check ax25_create_cb(void); 281 extern void ax25_fillin_cb(ax25_cb *, ax25_dev *); 282 extern struct sock *ax25_make_new(struct sock *, struct ax25_dev *); 283 284 /* ax25_addr.c */ 285 extern const ax25_address ax25_bcast; 286 extern const ax25_address ax25_defaddr; 287 extern const ax25_address null_ax25_address; 288 extern char *ax2asc(char *buf, const ax25_address *); 289 extern void asc2ax(ax25_address *addr, const char *callsign); 290 extern int ax25cmp(const ax25_address *, const ax25_address *); 291 extern int ax25digicmp(const ax25_digi *, const ax25_digi *); 292 extern const unsigned char *ax25_addr_parse(const unsigned char *, int, 293 ax25_address *, ax25_address *, ax25_digi *, int *, int *); 294 extern int ax25_addr_build(unsigned char *, const ax25_address *, 295 const ax25_address *, const ax25_digi *, int, int); 296 extern int ax25_addr_size(const ax25_digi *); 297 extern void ax25_digi_invert(const ax25_digi *, ax25_digi *); 298 299 /* ax25_dev.c */ 300 extern ax25_dev *ax25_dev_list; 301 extern spinlock_t ax25_dev_lock; 302 303 static inline ax25_dev *ax25_dev_ax25dev(struct net_device *dev) 304 { 305 return dev->ax25_ptr; 306 } 307 308 extern ax25_dev *ax25_addr_ax25dev(ax25_address *); 309 extern void ax25_dev_device_up(struct net_device *); 310 extern void ax25_dev_device_down(struct net_device *); 311 extern int ax25_fwd_ioctl(unsigned int, struct ax25_fwd_struct *); 312 extern struct net_device *ax25_fwd_dev(struct net_device *); 313 extern void ax25_dev_free(void); 314 315 /* ax25_ds_in.c */ 316 extern int ax25_ds_frame_in(ax25_cb *, struct sk_buff *, int); 317 318 /* ax25_ds_subr.c */ 319 extern void ax25_ds_nr_error_recovery(ax25_cb *); 320 extern void ax25_ds_enquiry_response(ax25_cb *); 321 extern void ax25_ds_establish_data_link(ax25_cb *); 322 extern void ax25_dev_dama_off(ax25_dev *); 323 extern void ax25_dama_on(ax25_cb *); 324 extern void ax25_dama_off(ax25_cb *); 325 326 /* ax25_ds_timer.c */ 327 extern void ax25_ds_setup_timer(ax25_dev *); 328 extern void ax25_ds_set_timer(ax25_dev *); 329 extern void ax25_ds_del_timer(ax25_dev *); 330 extern void ax25_ds_timer(ax25_cb *); 331 extern void ax25_ds_t1_timeout(ax25_cb *); 332 extern void ax25_ds_heartbeat_expiry(ax25_cb *); 333 extern void ax25_ds_t3timer_expiry(ax25_cb *); 334 extern void ax25_ds_idletimer_expiry(ax25_cb *); 335 336 /* ax25_iface.c */ 337 338 struct ax25_protocol { 339 struct ax25_protocol *next; 340 unsigned int pid; 341 int (*func)(struct sk_buff *, ax25_cb *); 342 }; 343 344 extern void ax25_register_pid(struct ax25_protocol *ap); 345 extern void ax25_protocol_release(unsigned int); 346 347 struct ax25_linkfail { 348 struct hlist_node lf_node; 349 void (*func)(ax25_cb *, int); 350 }; 351 352 extern void ax25_linkfail_register(struct ax25_linkfail *lf); 353 extern void ax25_linkfail_release(struct ax25_linkfail *lf); 354 extern int __must_check ax25_listen_register(ax25_address *, 355 struct net_device *); 356 extern void ax25_listen_release(ax25_address *, struct net_device *); 357 extern int (*ax25_protocol_function(unsigned int))(struct sk_buff *, ax25_cb *); 358 extern int ax25_listen_mine(ax25_address *, struct net_device *); 359 extern void ax25_link_failed(ax25_cb *, int); 360 extern int ax25_protocol_is_registered(unsigned int); 361 362 /* ax25_in.c */ 363 extern int ax25_rx_iframe(ax25_cb *, struct sk_buff *); 364 extern int ax25_kiss_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *); 365 366 /* ax25_ip.c */ 367 extern int ax25_hard_header(struct sk_buff *, struct net_device *, 368 unsigned short, const void *, 369 const void *, unsigned int); 370 extern int ax25_rebuild_header(struct sk_buff *); 371 extern const struct header_ops ax25_header_ops; 372 373 /* ax25_out.c */ 374 extern ax25_cb *ax25_send_frame(struct sk_buff *, int, ax25_address *, ax25_address *, ax25_digi *, struct net_device *); 375 extern void ax25_output(ax25_cb *, int, struct sk_buff *); 376 extern void ax25_kick(ax25_cb *); 377 extern void ax25_transmit_buffer(ax25_cb *, struct sk_buff *, int); 378 extern void ax25_queue_xmit(struct sk_buff *skb, struct net_device *dev); 379 extern int ax25_check_iframes_acked(ax25_cb *, unsigned short); 380 381 /* ax25_route.c */ 382 extern void ax25_rt_device_down(struct net_device *); 383 extern int ax25_rt_ioctl(unsigned int, void __user *); 384 extern const struct file_operations ax25_route_fops; 385 extern ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev); 386 extern int ax25_rt_autobind(ax25_cb *, ax25_address *); 387 extern struct sk_buff *ax25_rt_build_path(struct sk_buff *, ax25_address *, ax25_address *, ax25_digi *); 388 extern void ax25_rt_free(void); 389 390 /* ax25_std_in.c */ 391 extern int ax25_std_frame_in(ax25_cb *, struct sk_buff *, int); 392 393 /* ax25_std_subr.c */ 394 extern void ax25_std_nr_error_recovery(ax25_cb *); 395 extern void ax25_std_establish_data_link(ax25_cb *); 396 extern void ax25_std_transmit_enquiry(ax25_cb *); 397 extern void ax25_std_enquiry_response(ax25_cb *); 398 extern void ax25_std_timeout_response(ax25_cb *); 399 400 /* ax25_std_timer.c */ 401 extern void ax25_std_heartbeat_expiry(ax25_cb *); 402 extern void ax25_std_t1timer_expiry(ax25_cb *); 403 extern void ax25_std_t2timer_expiry(ax25_cb *); 404 extern void ax25_std_t3timer_expiry(ax25_cb *); 405 extern void ax25_std_idletimer_expiry(ax25_cb *); 406 407 /* ax25_subr.c */ 408 extern void ax25_clear_queues(ax25_cb *); 409 extern void ax25_frames_acked(ax25_cb *, unsigned short); 410 extern void ax25_requeue_frames(ax25_cb *); 411 extern int ax25_validate_nr(ax25_cb *, unsigned short); 412 extern int ax25_decode(ax25_cb *, struct sk_buff *, int *, int *, int *); 413 extern void ax25_send_control(ax25_cb *, int, int, int); 414 extern void ax25_return_dm(struct net_device *, ax25_address *, ax25_address *, ax25_digi *); 415 extern void ax25_calculate_t1(ax25_cb *); 416 extern void ax25_calculate_rtt(ax25_cb *); 417 extern void ax25_disconnect(ax25_cb *, int); 418 419 /* ax25_timer.c */ 420 extern void ax25_setup_timers(ax25_cb *); 421 extern void ax25_start_heartbeat(ax25_cb *); 422 extern void ax25_start_t1timer(ax25_cb *); 423 extern void ax25_start_t2timer(ax25_cb *); 424 extern void ax25_start_t3timer(ax25_cb *); 425 extern void ax25_start_idletimer(ax25_cb *); 426 extern void ax25_stop_heartbeat(ax25_cb *); 427 extern void ax25_stop_t1timer(ax25_cb *); 428 extern void ax25_stop_t2timer(ax25_cb *); 429 extern void ax25_stop_t3timer(ax25_cb *); 430 extern void ax25_stop_idletimer(ax25_cb *); 431 extern int ax25_t1timer_running(ax25_cb *); 432 extern unsigned long ax25_display_timer(struct timer_list *); 433 434 /* ax25_uid.c */ 435 extern int ax25_uid_policy; 436 extern ax25_uid_assoc *ax25_findbyuid(uid_t); 437 extern int __must_check ax25_uid_ioctl(int, struct sockaddr_ax25 *); 438 extern const struct file_operations ax25_uid_fops; 439 extern void ax25_uid_free(void); 440 441 /* sysctl_net_ax25.c */ 442 #ifdef CONFIG_SYSCTL 443 extern void ax25_register_sysctl(void); 444 extern void ax25_unregister_sysctl(void); 445 #else 446 static inline void ax25_register_sysctl(void) {}; 447 static inline void ax25_unregister_sysctl(void) {}; 448 #endif /* CONFIG_SYSCTL */ 449 450 #endif 451