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(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 408