1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Declarations of AX.25 type objects. 4 * 5 * Alan Cox (GW4PTS) 10/11/93 6 */ 7 #ifndef _AX25_H 8 #define _AX25_H 9 10 #include <linux/ax25.h> 11 #include <linux/spinlock.h> 12 #include <linux/timer.h> 13 #include <linux/list.h> 14 #include <linux/slab.h> 15 #include <linux/refcount.h> 16 #include <net/neighbour.h> 17 #include <net/sock.h> 18 #include <linux/seq_file.h> 19 20 #define AX25_T1CLAMPLO 1 21 #define AX25_T1CLAMPHI (30 * HZ) 22 23 #define AX25_BPQ_HEADER_LEN 16 24 #define AX25_KISS_HEADER_LEN 1 25 26 #define AX25_HEADER_LEN 17 27 #define AX25_ADDR_LEN 7 28 #define AX25_DIGI_HEADER_LEN (AX25_MAX_DIGIS * AX25_ADDR_LEN) 29 #define AX25_MAX_HEADER_LEN (AX25_HEADER_LEN + AX25_DIGI_HEADER_LEN) 30 31 /* AX.25 Protocol IDs */ 32 #define AX25_P_ROSE 0x01 33 #define AX25_P_VJCOMP 0x06 /* Compressed TCP/IP packet */ 34 /* Van Jacobsen (RFC 1144) */ 35 #define AX25_P_VJUNCOMP 0x07 /* Uncompressed TCP/IP packet */ 36 /* Van Jacobsen (RFC 1144) */ 37 #define AX25_P_SEGMENT 0x08 /* Segmentation fragment */ 38 #define AX25_P_TEXNET 0xc3 /* TEXTNET datagram protocol */ 39 #define AX25_P_LQ 0xc4 /* Link Quality Protocol */ 40 #define AX25_P_ATALK 0xca /* Appletalk */ 41 #define AX25_P_ATALK_ARP 0xcb /* Appletalk ARP */ 42 #define AX25_P_IP 0xcc /* ARPA Internet Protocol */ 43 #define AX25_P_ARP 0xcd /* ARPA Address Resolution */ 44 #define AX25_P_FLEXNET 0xce /* FlexNet */ 45 #define AX25_P_NETROM 0xcf /* NET/ROM */ 46 #define AX25_P_TEXT 0xF0 /* No layer 3 protocol impl. */ 47 48 /* AX.25 Segment control values */ 49 #define AX25_SEG_REM 0x7F 50 #define AX25_SEG_FIRST 0x80 51 52 #define AX25_CBIT 0x80 /* Command/Response bit */ 53 #define AX25_EBIT 0x01 /* HDLC Address Extension bit */ 54 #define AX25_HBIT 0x80 /* Has been repeated bit */ 55 56 #define AX25_SSSID_SPARE 0x60 /* Unused bits in SSID for standard AX.25 */ 57 #define AX25_ESSID_SPARE 0x20 /* Unused bits in SSID for extended AX.25 */ 58 #define AX25_DAMA_FLAG 0x20 /* Well, it is *NOT* unused! (dl1bke 951121 */ 59 60 #define AX25_COND_ACK_PENDING 0x01 61 #define AX25_COND_REJECT 0x02 62 #define AX25_COND_PEER_RX_BUSY 0x04 63 #define AX25_COND_OWN_RX_BUSY 0x08 64 #define AX25_COND_DAMA_MODE 0x10 65 66 #ifndef _LINUX_NETDEVICE_H 67 #include <linux/netdevice.h> 68 #endif 69 70 /* Upper sub-layer (LAPB) definitions */ 71 72 /* Control field templates */ 73 #define AX25_I 0x00 /* Information frames */ 74 #define AX25_S 0x01 /* Supervisory frames */ 75 #define AX25_RR 0x01 /* Receiver ready */ 76 #define AX25_RNR 0x05 /* Receiver not ready */ 77 #define AX25_REJ 0x09 /* Reject */ 78 #define AX25_U 0x03 /* Unnumbered frames */ 79 #define AX25_SABM 0x2f /* Set Asynchronous Balanced Mode */ 80 #define AX25_SABME 0x6f /* Set Asynchronous Balanced Mode Extended */ 81 #define AX25_DISC 0x43 /* Disconnect */ 82 #define AX25_DM 0x0f /* Disconnected mode */ 83 #define AX25_UA 0x63 /* Unnumbered acknowledge */ 84 #define AX25_FRMR 0x87 /* Frame reject */ 85 #define AX25_UI 0x03 /* Unnumbered information */ 86 #define AX25_XID 0xaf /* Exchange information */ 87 #define AX25_TEST 0xe3 /* Test */ 88 89 #define AX25_PF 0x10 /* Poll/final bit for standard AX.25 */ 90 #define AX25_EPF 0x01 /* Poll/final bit for extended AX.25 */ 91 92 #define AX25_ILLEGAL 0x100 /* Impossible to be a real frame type */ 93 94 #define AX25_POLLOFF 0 95 #define AX25_POLLON 1 96 97 /* AX25 L2 C-bit */ 98 #define AX25_COMMAND 1 99 #define AX25_RESPONSE 2 100 101 /* Define Link State constants. */ 102 103 enum { 104 AX25_STATE_0, /* Listening */ 105 AX25_STATE_1, /* SABM sent */ 106 AX25_STATE_2, /* DISC sent */ 107 AX25_STATE_3, /* Established */ 108 AX25_STATE_4 /* Recovery */ 109 }; 110 111 #define AX25_MODULUS 8 /* Standard AX.25 modulus */ 112 #define AX25_EMODULUS 128 /* Extended AX.25 modulus */ 113 114 enum { 115 AX25_PROTO_STD_SIMPLEX, 116 AX25_PROTO_STD_DUPLEX, 117 #ifdef CONFIG_AX25_DAMA_SLAVE 118 AX25_PROTO_DAMA_SLAVE, 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 */ 138 #ifdef CONFIG_AX25_DAMA_SLAVE 139 AX25_VALUES_DS_TIMEOUT, /* DAMA Slave timeout */ 140 #endif 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 refcount_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 refcount_inc(&((ax25)->refcount)) 171 172 static inline void ax25_uid_put(ax25_uid_assoc *assoc) 173 { 174 if (refcount_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 ax25_address callsign; 189 struct net_device *dev; 190 ax25_digi *digipeat; 191 char ip_mode; 192 } ax25_route; 193 194 void __ax25_put_route(ax25_route *ax25_rt); 195 196 extern rwlock_t ax25_route_lock; 197 198 static inline void ax25_route_lock_use(void) 199 { 200 read_lock(&ax25_route_lock); 201 } 202 203 static inline void ax25_route_lock_unuse(void) 204 { 205 read_unlock(&ax25_route_lock); 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 list_head list; 218 219 struct net_device *dev; 220 netdevice_tracker dev_tracker; 221 222 struct net_device *forward; 223 struct ctl_table_header *sysheader; 224 int values[AX25_MAX_VALUES]; 225 #ifdef CONFIG_AX25_DAMA_SLAVE 226 ax25_dama_info dama; 227 #endif 228 refcount_t refcount; 229 bool device_up; 230 struct rcu_head rcu; 231 } ax25_dev; 232 233 typedef struct ax25_cb { 234 struct hlist_node ax25_node; 235 ax25_address source_addr, dest_addr; 236 ax25_digi *digipeat; 237 ax25_dev *ax25_dev; 238 netdevice_tracker dev_tracker; 239 unsigned char iamdigi; 240 unsigned char state, modulus, pidincl; 241 unsigned short vs, vr, va; 242 unsigned char condition, backoff; 243 unsigned char n2, n2count; 244 struct timer_list t1timer, t2timer, t3timer, idletimer; 245 unsigned long t1, t2, t3, idle, rtt; 246 unsigned short paclen, fragno, fraglen; 247 struct sk_buff_head write_queue; 248 struct sk_buff_head reseq_queue; 249 struct sk_buff_head ack_queue; 250 struct sk_buff_head frag_queue; 251 unsigned char window; 252 struct timer_list timer, dtimer; 253 struct sock *sk; /* Backlink to socket */ 254 refcount_t refcount; 255 } ax25_cb; 256 257 struct ax25_sock { 258 struct sock sk; 259 struct ax25_cb *cb; 260 }; 261 262 #define ax25_sk(ptr) container_of_const(ptr, struct ax25_sock, sk) 263 264 static inline struct ax25_cb *sk_to_ax25(const struct sock *sk) 265 { 266 return ax25_sk(sk)->cb; 267 } 268 269 #define ax25_for_each(__ax25, list) \ 270 hlist_for_each_entry(__ax25, list, ax25_node) 271 272 #define ax25_cb_hold(__ax25) \ 273 refcount_inc(&((__ax25)->refcount)) 274 275 static __inline__ void ax25_cb_put(ax25_cb *ax25) 276 { 277 if (refcount_dec_and_test(&ax25->refcount)) { 278 kfree(ax25->digipeat); 279 kfree(ax25); 280 } 281 } 282 283 static inline void ax25_dev_hold(ax25_dev *ax25_dev) 284 { 285 refcount_inc(&ax25_dev->refcount); 286 } 287 288 static inline void ax25_dev_put(ax25_dev *ax25_dev) 289 { 290 if (refcount_dec_and_test(&ax25_dev->refcount)) 291 kfree_rcu(ax25_dev, rcu); 292 } 293 static inline __be16 ax25_type_trans(struct sk_buff *skb, struct net_device *dev) 294 { 295 skb->dev = dev; 296 skb_reset_mac_header(skb); 297 skb->pkt_type = PACKET_HOST; 298 return htons(ETH_P_AX25); 299 } 300 301 /* af_ax25.c */ 302 extern struct hlist_head ax25_list; 303 extern spinlock_t ax25_list_lock; 304 void ax25_cb_add(ax25_cb *); 305 struct sock *ax25_find_listener(ax25_address *, int, struct net_device *, int); 306 struct sock *ax25_get_socket(ax25_address *, ax25_address *, int); 307 ax25_cb *ax25_find_cb(const ax25_address *, ax25_address *, ax25_digi *, 308 struct net_device *); 309 void ax25_send_to_raw(ax25_address *, struct sk_buff *, int); 310 void ax25_destroy_socket(ax25_cb *); 311 ax25_cb * __must_check ax25_create_cb(void); 312 void ax25_fillin_cb(ax25_cb *, ax25_dev *); 313 struct sock *ax25_make_new(struct sock *, struct ax25_dev *); 314 315 /* ax25_addr.c */ 316 extern const ax25_address ax25_bcast; 317 extern const ax25_address ax25_defaddr; 318 extern const ax25_address null_ax25_address; 319 char *ax2asc(char *buf, const ax25_address *); 320 void asc2ax(ax25_address *addr, const char *callsign); 321 int ax25cmp(const ax25_address *, const ax25_address *); 322 int ax25digicmp(const ax25_digi *, const ax25_digi *); 323 const unsigned char *ax25_addr_parse(const unsigned char *, int, 324 ax25_address *, ax25_address *, ax25_digi *, int *, int *); 325 int ax25_addr_build(unsigned char *, const ax25_address *, 326 const ax25_address *, const ax25_digi *, int, int); 327 int ax25_addr_size(const ax25_digi *); 328 void ax25_digi_invert(const ax25_digi *, ax25_digi *); 329 330 /* ax25_dev.c */ 331 extern spinlock_t ax25_dev_lock; 332 333 #if IS_ENABLED(CONFIG_AX25) 334 static inline ax25_dev *ax25_dev_ax25dev(const struct net_device *dev) 335 { 336 return rcu_dereference_rtnl(dev->ax25_ptr); 337 } 338 #endif 339 340 ax25_dev *ax25_addr_ax25dev(ax25_address *); 341 void ax25_dev_device_up(struct net_device *); 342 void ax25_dev_device_down(struct net_device *); 343 int ax25_fwd_ioctl(unsigned int, struct ax25_fwd_struct *); 344 struct net_device *ax25_fwd_dev(struct net_device *); 345 void ax25_dev_free(void); 346 347 /* ax25_ds_in.c */ 348 int ax25_ds_frame_in(ax25_cb *, struct sk_buff *, int); 349 350 /* ax25_ds_subr.c */ 351 void ax25_ds_nr_error_recovery(ax25_cb *); 352 void ax25_ds_enquiry_response(ax25_cb *); 353 void ax25_ds_establish_data_link(ax25_cb *); 354 void ax25_dev_dama_off(ax25_dev *); 355 void ax25_dama_on(ax25_cb *); 356 void ax25_dama_off(ax25_cb *); 357 358 /* ax25_ds_timer.c */ 359 void ax25_ds_setup_timer(ax25_dev *); 360 void ax25_ds_set_timer(ax25_dev *); 361 void ax25_ds_del_timer(ax25_dev *); 362 void ax25_ds_timer(ax25_cb *); 363 void ax25_ds_t1_timeout(ax25_cb *); 364 void ax25_ds_heartbeat_expiry(ax25_cb *); 365 void ax25_ds_t3timer_expiry(ax25_cb *); 366 void ax25_ds_idletimer_expiry(ax25_cb *); 367 368 /* ax25_iface.c */ 369 370 struct ax25_protocol { 371 struct ax25_protocol *next; 372 unsigned int pid; 373 int (*func)(struct sk_buff *, ax25_cb *); 374 }; 375 376 void ax25_register_pid(struct ax25_protocol *ap); 377 void ax25_protocol_release(unsigned int); 378 379 struct ax25_linkfail { 380 struct hlist_node lf_node; 381 void (*func)(ax25_cb *, int); 382 }; 383 384 void ax25_linkfail_register(struct ax25_linkfail *lf); 385 void ax25_linkfail_release(struct ax25_linkfail *lf); 386 int __must_check ax25_listen_register(const ax25_address *, 387 struct net_device *); 388 void ax25_listen_release(const ax25_address *, struct net_device *); 389 int(*ax25_protocol_function(unsigned int))(struct sk_buff *, ax25_cb *); 390 int ax25_listen_mine(const ax25_address *, struct net_device *); 391 void ax25_link_failed(ax25_cb *, int); 392 int ax25_protocol_is_registered(unsigned int); 393 394 /* ax25_in.c */ 395 int ax25_rx_iframe(ax25_cb *, struct sk_buff *); 396 int ax25_kiss_rcv(struct sk_buff *, struct net_device *, struct packet_type *, 397 struct net_device *); 398 399 /* ax25_ip.c */ 400 netdev_tx_t ax25_ip_xmit(struct sk_buff *skb); 401 extern const struct header_ops ax25_header_ops; 402 403 /* ax25_out.c */ 404 ax25_cb *ax25_send_frame(struct sk_buff *, int, const ax25_address *, 405 ax25_address *, ax25_digi *, struct net_device *); 406 void ax25_output(ax25_cb *, int, struct sk_buff *); 407 void ax25_kick(ax25_cb *); 408 void ax25_transmit_buffer(ax25_cb *, struct sk_buff *, int); 409 void ax25_queue_xmit(struct sk_buff *skb, struct net_device *dev); 410 int ax25_check_iframes_acked(ax25_cb *, unsigned short); 411 412 /* ax25_route.c */ 413 void ax25_rt_device_down(struct net_device *); 414 int ax25_rt_ioctl(unsigned int, void __user *); 415 extern const struct seq_operations ax25_rt_seqops; 416 ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev); 417 struct sk_buff *ax25_rt_build_path(struct sk_buff *, ax25_address *, 418 ax25_address *, ax25_digi *); 419 void ax25_rt_free(void); 420 421 /* ax25_std_in.c */ 422 int ax25_std_frame_in(ax25_cb *, struct sk_buff *, int); 423 424 /* ax25_std_subr.c */ 425 void ax25_std_nr_error_recovery(ax25_cb *); 426 void ax25_std_establish_data_link(ax25_cb *); 427 void ax25_std_transmit_enquiry(ax25_cb *); 428 void ax25_std_enquiry_response(ax25_cb *); 429 void ax25_std_timeout_response(ax25_cb *); 430 431 /* ax25_std_timer.c */ 432 void ax25_std_heartbeat_expiry(ax25_cb *); 433 void ax25_std_t1timer_expiry(ax25_cb *); 434 void ax25_std_t2timer_expiry(ax25_cb *); 435 void ax25_std_t3timer_expiry(ax25_cb *); 436 void ax25_std_idletimer_expiry(ax25_cb *); 437 438 /* ax25_subr.c */ 439 void ax25_clear_queues(ax25_cb *); 440 void ax25_frames_acked(ax25_cb *, unsigned short); 441 void ax25_requeue_frames(ax25_cb *); 442 int ax25_validate_nr(ax25_cb *, unsigned short); 443 int ax25_decode(ax25_cb *, struct sk_buff *, int *, int *, int *); 444 void ax25_send_control(ax25_cb *, int, int, int); 445 void ax25_return_dm(struct net_device *, ax25_address *, ax25_address *, 446 ax25_digi *); 447 void ax25_calculate_t1(ax25_cb *); 448 void ax25_calculate_rtt(ax25_cb *); 449 void ax25_disconnect(ax25_cb *, int); 450 451 /* ax25_timer.c */ 452 void ax25_setup_timers(ax25_cb *); 453 void ax25_start_heartbeat(ax25_cb *); 454 void ax25_start_t1timer(ax25_cb *); 455 void ax25_start_t2timer(ax25_cb *); 456 void ax25_start_t3timer(ax25_cb *); 457 void ax25_start_idletimer(ax25_cb *); 458 void ax25_stop_heartbeat(ax25_cb *); 459 void ax25_stop_t1timer(ax25_cb *); 460 void ax25_stop_t2timer(ax25_cb *); 461 void ax25_stop_t3timer(ax25_cb *); 462 void ax25_stop_idletimer(ax25_cb *); 463 int ax25_t1timer_running(ax25_cb *); 464 unsigned long ax25_display_timer(struct timer_list *); 465 466 /* ax25_uid.c */ 467 extern int ax25_uid_policy; 468 ax25_uid_assoc *ax25_findbyuid(kuid_t); 469 int __must_check ax25_uid_ioctl(int, struct sockaddr_ax25 *); 470 extern const struct seq_operations ax25_uid_seqops; 471 void ax25_uid_free(void); 472 473 /* sysctl_net_ax25.c */ 474 #ifdef CONFIG_SYSCTL 475 int ax25_register_dev_sysctl(ax25_dev *ax25_dev); 476 void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev); 477 #else 478 static inline int ax25_register_dev_sysctl(ax25_dev *ax25_dev) { return 0; } 479 static inline void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev) {} 480 #endif /* CONFIG_SYSCTL */ 481 482 #endif 483