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_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 Adress 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 AX25_PROTO_DAMA_SLAVE, 114 AX25_PROTO_DAMA_MASTER 115 }; 116 117 enum { 118 AX25_VALUES_IPDEFMODE, /* 0=DG 1=VC */ 119 AX25_VALUES_AXDEFMODE, /* 0=Normal 1=Extended Seq Nos */ 120 AX25_VALUES_BACKOFF, /* 0=None 1=Linear 2=Exponential */ 121 AX25_VALUES_CONMODE, /* Allow connected modes - 0=No 1=no "PID text" 2=all PIDs */ 122 AX25_VALUES_WINDOW, /* Default window size for standard AX.25 */ 123 AX25_VALUES_EWINDOW, /* Default window size for extended AX.25 */ 124 AX25_VALUES_T1, /* Default T1 timeout value */ 125 AX25_VALUES_T2, /* Default T2 timeout value */ 126 AX25_VALUES_T3, /* Default T3 timeout value */ 127 AX25_VALUES_IDLE, /* Connected mode idle timer */ 128 AX25_VALUES_N2, /* Default N2 value */ 129 AX25_VALUES_PACLEN, /* AX.25 MTU */ 130 AX25_VALUES_PROTOCOL, /* Std AX.25, DAMA Slave, DAMA Master */ 131 AX25_VALUES_DS_TIMEOUT, /* DAMA Slave timeout */ 132 AX25_MAX_VALUES /* THIS MUST REMAIN THE LAST ENTRY OF THIS LIST */ 133 }; 134 135 #define AX25_DEF_IPDEFMODE 0 /* Datagram */ 136 #define AX25_DEF_AXDEFMODE 0 /* Normal */ 137 #define AX25_DEF_BACKOFF 1 /* Linear backoff */ 138 #define AX25_DEF_CONMODE 2 /* Connected mode allowed */ 139 #define AX25_DEF_WINDOW 2 /* Window=2 */ 140 #define AX25_DEF_EWINDOW 32 /* Module-128 Window=32 */ 141 #define AX25_DEF_T1 (10 * HZ) /* T1=10s */ 142 #define AX25_DEF_T2 (3 * HZ) /* T2=3s */ 143 #define AX25_DEF_T3 (300 * HZ) /* T3=300s */ 144 #define AX25_DEF_N2 10 /* N2=10 */ 145 #define AX25_DEF_IDLE (0 * 60 * HZ) /* Idle=None */ 146 #define AX25_DEF_PACLEN 256 /* Paclen=256 */ 147 #define AX25_DEF_PROTOCOL AX25_PROTO_STD_SIMPLEX /* Standard AX.25 */ 148 #define AX25_DEF_DS_TIMEOUT (3 * 60 * HZ) /* DAMA timeout 3 minutes */ 149 150 typedef struct ax25_uid_assoc { 151 struct hlist_node uid_node; 152 atomic_t refcount; 153 uid_t uid; 154 ax25_address call; 155 } ax25_uid_assoc; 156 157 #define ax25_uid_for_each(__ax25, node, list) \ 158 hlist_for_each_entry(__ax25, node, list, uid_node) 159 160 #define ax25_uid_hold(ax25) \ 161 atomic_inc(&((ax25)->refcount)) 162 163 static inline void ax25_uid_put(ax25_uid_assoc *assoc) 164 { 165 if (atomic_dec_and_test(&assoc->refcount)) { 166 kfree(assoc); 167 } 168 } 169 170 typedef struct { 171 ax25_address calls[AX25_MAX_DIGIS]; 172 unsigned char repeated[AX25_MAX_DIGIS]; 173 unsigned char ndigi; 174 signed char lastrepeat; 175 } ax25_digi; 176 177 typedef struct ax25_route { 178 struct ax25_route *next; 179 atomic_t ref; 180 ax25_address callsign; 181 struct net_device *dev; 182 ax25_digi *digipeat; 183 char ip_mode; 184 struct timer_list timer; 185 } ax25_route; 186 187 typedef struct { 188 char slave; /* slave_mode? */ 189 struct timer_list slave_timer; /* timeout timer */ 190 unsigned short slave_timeout; /* when? */ 191 } ax25_dama_info; 192 193 struct ctl_table; 194 195 typedef struct ax25_dev { 196 struct ax25_dev *next; 197 struct net_device *dev; 198 struct net_device *forward; 199 struct ctl_table *systable; 200 int values[AX25_MAX_VALUES]; 201 #if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER) 202 ax25_dama_info dama; 203 #endif 204 } ax25_dev; 205 206 typedef struct ax25_cb { 207 struct hlist_node ax25_node; 208 ax25_address source_addr, dest_addr; 209 ax25_digi *digipeat; 210 ax25_dev *ax25_dev; 211 unsigned char iamdigi; 212 unsigned char state, modulus, pidincl; 213 unsigned short vs, vr, va; 214 unsigned char condition, backoff; 215 unsigned char n2, n2count; 216 struct timer_list t1timer, t2timer, t3timer, idletimer; 217 unsigned long t1, t2, t3, idle, rtt; 218 unsigned short paclen, fragno, fraglen; 219 struct sk_buff_head write_queue; 220 struct sk_buff_head reseq_queue; 221 struct sk_buff_head ack_queue; 222 struct sk_buff_head frag_queue; 223 unsigned char window; 224 struct timer_list timer, dtimer; 225 struct sock *sk; /* Backlink to socket */ 226 atomic_t refcount; 227 } ax25_cb; 228 229 #define ax25_sk(__sk) ((ax25_cb *)(__sk)->sk_protinfo) 230 231 #define ax25_for_each(__ax25, node, list) \ 232 hlist_for_each_entry(__ax25, node, list, ax25_node) 233 234 #define ax25_cb_hold(__ax25) \ 235 atomic_inc(&((__ax25)->refcount)) 236 237 static __inline__ void ax25_cb_put(ax25_cb *ax25) 238 { 239 if (atomic_dec_and_test(&ax25->refcount)) { 240 kfree(ax25->digipeat); 241 kfree(ax25); 242 } 243 } 244 245 static inline __be16 ax25_type_trans(struct sk_buff *skb, struct net_device *dev) 246 { 247 skb->dev = dev; 248 skb->pkt_type = PACKET_HOST; 249 skb->mac.raw = skb->data; 250 return htons(ETH_P_AX25); 251 } 252 253 /* af_ax25.c */ 254 extern struct hlist_head ax25_list; 255 extern spinlock_t ax25_list_lock; 256 extern void ax25_cb_add(ax25_cb *); 257 struct sock *ax25_find_listener(ax25_address *, int, struct net_device *, int); 258 struct sock *ax25_get_socket(ax25_address *, ax25_address *, int); 259 extern ax25_cb *ax25_find_cb(ax25_address *, ax25_address *, ax25_digi *, struct net_device *); 260 extern void ax25_send_to_raw(ax25_address *, struct sk_buff *, int); 261 extern void ax25_destroy_socket(ax25_cb *); 262 extern ax25_cb *ax25_create_cb(void); 263 extern void ax25_fillin_cb(ax25_cb *, ax25_dev *); 264 extern struct sock *ax25_make_new(struct sock *, struct ax25_dev *); 265 266 /* ax25_addr.c */ 267 extern ax25_address null_ax25_address; 268 extern char *ax2asc(char *buf, ax25_address *); 269 extern void asc2ax(ax25_address *addr, char *callsign); 270 extern int ax25cmp(ax25_address *, ax25_address *); 271 extern int ax25digicmp(ax25_digi *, ax25_digi *); 272 extern unsigned char *ax25_addr_parse(unsigned char *, int, ax25_address *, ax25_address *, ax25_digi *, int *, int *); 273 extern int ax25_addr_build(unsigned char *, ax25_address *, ax25_address *, ax25_digi *, int, int); 274 extern int ax25_addr_size(ax25_digi *); 275 extern void ax25_digi_invert(ax25_digi *, ax25_digi *); 276 277 /* ax25_dev.c */ 278 extern ax25_dev *ax25_dev_list; 279 extern spinlock_t ax25_dev_lock; 280 281 static inline ax25_dev *ax25_dev_ax25dev(struct net_device *dev) 282 { 283 return dev->ax25_ptr; 284 } 285 286 extern ax25_dev *ax25_addr_ax25dev(ax25_address *); 287 extern void ax25_dev_device_up(struct net_device *); 288 extern void ax25_dev_device_down(struct net_device *); 289 extern int ax25_fwd_ioctl(unsigned int, struct ax25_fwd_struct *); 290 extern struct net_device *ax25_fwd_dev(struct net_device *); 291 extern void ax25_dev_free(void); 292 293 /* ax25_ds_in.c */ 294 extern int ax25_ds_frame_in(ax25_cb *, struct sk_buff *, int); 295 296 /* ax25_ds_subr.c */ 297 extern void ax25_ds_nr_error_recovery(ax25_cb *); 298 extern void ax25_ds_enquiry_response(ax25_cb *); 299 extern void ax25_ds_establish_data_link(ax25_cb *); 300 extern void ax25_dev_dama_off(ax25_dev *); 301 extern void ax25_dama_on(ax25_cb *); 302 extern void ax25_dama_off(ax25_cb *); 303 304 /* ax25_ds_timer.c */ 305 extern void ax25_ds_set_timer(ax25_dev *); 306 extern void ax25_ds_del_timer(ax25_dev *); 307 extern void ax25_ds_timer(ax25_cb *); 308 extern void ax25_ds_t1_timeout(ax25_cb *); 309 extern void ax25_ds_heartbeat_expiry(ax25_cb *); 310 extern void ax25_ds_t3timer_expiry(ax25_cb *); 311 extern void ax25_ds_idletimer_expiry(ax25_cb *); 312 313 /* ax25_iface.c */ 314 extern int ax25_protocol_register(unsigned int, int (*)(struct sk_buff *, ax25_cb *)); 315 extern void ax25_protocol_release(unsigned int); 316 extern int ax25_linkfail_register(void (*)(ax25_cb *, int)); 317 extern void ax25_linkfail_release(void (*)(ax25_cb *, int)); 318 extern int ax25_listen_register(ax25_address *, struct net_device *); 319 extern void ax25_listen_release(ax25_address *, struct net_device *); 320 extern int (*ax25_protocol_function(unsigned int))(struct sk_buff *, ax25_cb *); 321 extern int ax25_listen_mine(ax25_address *, struct net_device *); 322 extern void ax25_link_failed(ax25_cb *, int); 323 extern int ax25_protocol_is_registered(unsigned int); 324 325 /* ax25_in.c */ 326 extern int ax25_rx_iframe(ax25_cb *, struct sk_buff *); 327 extern int ax25_kiss_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *); 328 329 /* ax25_ip.c */ 330 extern int ax25_hard_header(struct sk_buff *, struct net_device *, unsigned short, void *, void *, unsigned int); 331 extern int ax25_rebuild_header(struct sk_buff *); 332 333 /* ax25_out.c */ 334 extern ax25_cb *ax25_send_frame(struct sk_buff *, int, ax25_address *, ax25_address *, ax25_digi *, struct net_device *); 335 extern void ax25_output(ax25_cb *, int, struct sk_buff *); 336 extern void ax25_kick(ax25_cb *); 337 extern void ax25_transmit_buffer(ax25_cb *, struct sk_buff *, int); 338 extern void ax25_queue_xmit(struct sk_buff *skb, struct net_device *dev); 339 extern int ax25_check_iframes_acked(ax25_cb *, unsigned short); 340 341 /* ax25_route.c */ 342 extern void ax25_rt_device_down(struct net_device *); 343 extern int ax25_rt_ioctl(unsigned int, void __user *); 344 extern struct file_operations ax25_route_fops; 345 extern int ax25_rt_autobind(ax25_cb *, ax25_address *); 346 extern ax25_route *ax25_rt_find_route(ax25_route *, ax25_address *, 347 struct net_device *); 348 extern struct sk_buff *ax25_rt_build_path(struct sk_buff *, ax25_address *, ax25_address *, ax25_digi *); 349 extern void ax25_rt_free(void); 350 351 static inline void ax25_put_route(ax25_route *ax25_rt) 352 { 353 atomic_dec(&ax25_rt->ref); 354 } 355 356 /* ax25_std_in.c */ 357 extern int ax25_std_frame_in(ax25_cb *, struct sk_buff *, int); 358 359 /* ax25_std_subr.c */ 360 extern void ax25_std_nr_error_recovery(ax25_cb *); 361 extern void ax25_std_establish_data_link(ax25_cb *); 362 extern void ax25_std_transmit_enquiry(ax25_cb *); 363 extern void ax25_std_enquiry_response(ax25_cb *); 364 extern void ax25_std_timeout_response(ax25_cb *); 365 366 /* ax25_std_timer.c */ 367 extern void ax25_std_heartbeat_expiry(ax25_cb *); 368 extern void ax25_std_t1timer_expiry(ax25_cb *); 369 extern void ax25_std_t2timer_expiry(ax25_cb *); 370 extern void ax25_std_t3timer_expiry(ax25_cb *); 371 extern void ax25_std_idletimer_expiry(ax25_cb *); 372 373 /* ax25_subr.c */ 374 extern void ax25_clear_queues(ax25_cb *); 375 extern void ax25_frames_acked(ax25_cb *, unsigned short); 376 extern void ax25_requeue_frames(ax25_cb *); 377 extern int ax25_validate_nr(ax25_cb *, unsigned short); 378 extern int ax25_decode(ax25_cb *, struct sk_buff *, int *, int *, int *); 379 extern void ax25_send_control(ax25_cb *, int, int, int); 380 extern void ax25_return_dm(struct net_device *, ax25_address *, ax25_address *, ax25_digi *); 381 extern void ax25_calculate_t1(ax25_cb *); 382 extern void ax25_calculate_rtt(ax25_cb *); 383 extern void ax25_disconnect(ax25_cb *, int); 384 385 /* ax25_timer.c */ 386 extern void ax25_start_heartbeat(ax25_cb *); 387 extern void ax25_start_t1timer(ax25_cb *); 388 extern void ax25_start_t2timer(ax25_cb *); 389 extern void ax25_start_t3timer(ax25_cb *); 390 extern void ax25_start_idletimer(ax25_cb *); 391 extern void ax25_stop_heartbeat(ax25_cb *); 392 extern void ax25_stop_t1timer(ax25_cb *); 393 extern void ax25_stop_t2timer(ax25_cb *); 394 extern void ax25_stop_t3timer(ax25_cb *); 395 extern void ax25_stop_idletimer(ax25_cb *); 396 extern int ax25_t1timer_running(ax25_cb *); 397 extern unsigned long ax25_display_timer(struct timer_list *); 398 399 /* ax25_uid.c */ 400 extern int ax25_uid_policy; 401 extern ax25_uid_assoc *ax25_findbyuid(uid_t); 402 extern int ax25_uid_ioctl(int, struct sockaddr_ax25 *); 403 extern struct file_operations ax25_uid_fops; 404 extern void ax25_uid_free(void); 405 406 /* sysctl_net_ax25.c */ 407 #ifdef CONFIG_SYSCTL 408 extern void ax25_register_sysctl(void); 409 extern void ax25_unregister_sysctl(void); 410 #else 411 static inline void ax25_register_sysctl(void) {}; 412 static inline void ax25_unregister_sysctl(void) {}; 413 #endif /* CONFIG_SYSCTL */ 414 415 #endif 416