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 468