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 <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 Address 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 99enum { 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 110enum { 111 AX25_PROTO_STD_SIMPLEX, 112 AX25_PROTO_STD_DUPLEX, 113#ifdef CONFIG_AX25_DAMA_SLAVE 114 AX25_PROTO_DAMA_SLAVE, 115#ifdef CONFIG_AX25_DAMA_MASTER 116 AX25_PROTO_DAMA_MASTER, 117#define AX25_PROTO_MAX AX25_PROTO_DAMA_MASTER 118#endif 119#endif 120 __AX25_PROTO_MAX, 121 AX25_PROTO_MAX = __AX25_PROTO_MAX -1 122}; 123 124enum { 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, DAMA Master */ 138 AX25_VALUES_DS_TIMEOUT, /* DAMA Slave timeout */ 139 AX25_MAX_VALUES /* THIS MUST REMAIN THE LAST ENTRY OF THIS LIST */ 140}; 141 142#define AX25_DEF_IPDEFMODE 0 /* Datagram */ 143#define AX25_DEF_AXDEFMODE 0 /* Normal */ 144#define AX25_DEF_BACKOFF 1 /* Linear backoff */ 145#define AX25_DEF_CONMODE 2 /* Connected mode allowed */ 146#define AX25_DEF_WINDOW 2 /* Window=2 */ 147#define AX25_DEF_EWINDOW 32 /* Module-128 Window=32 */ 148#define AX25_DEF_T1 10000 /* T1=10s */ 149#define AX25_DEF_T2 3000 /* T2=3s */ 150#define AX25_DEF_T3 300000 /* T3=300s */ 151#define AX25_DEF_N2 10 /* N2=10 */ 152#define AX25_DEF_IDLE 0 /* Idle=None */ 153#define AX25_DEF_PACLEN 256 /* Paclen=256 */ 154#define AX25_DEF_PROTOCOL AX25_PROTO_STD_SIMPLEX /* Standard AX.25 */ 155#define AX25_DEF_DS_TIMEOUT 180000 /* DAMA timeout 3 minutes */ 156 157typedef struct ax25_uid_assoc { 158 struct hlist_node uid_node; 159 atomic_t refcount; 160 uid_t uid; 161 ax25_address call; 162} ax25_uid_assoc; 163 164#define ax25_uid_for_each(__ax25, node, list) \ 165 hlist_for_each_entry(__ax25, node, list, uid_node) 166 167#define ax25_uid_hold(ax25) \ 168 atomic_inc(&((ax25)->refcount)) 169 170static inline void ax25_uid_put(ax25_uid_assoc *assoc) 171{ 172 if (atomic_dec_and_test(&assoc->refcount)) { 173 kfree(assoc); 174 } 175} 176 177typedef struct { 178 ax25_address calls[AX25_MAX_DIGIS]; 179 unsigned char repeated[AX25_MAX_DIGIS]; 180 unsigned char ndigi; 181 signed char lastrepeat; 182} ax25_digi; 183 184typedef struct ax25_route { 185 struct ax25_route *next; 186 atomic_t refcount; 187 ax25_address callsign; 188 struct net_device *dev; 189 ax25_digi *digipeat; 190 char ip_mode; 191} ax25_route; 192 193static inline void ax25_hold_route(ax25_route *ax25_rt) 194{ 195 atomic_inc(&ax25_rt->refcount); 196} 197 198extern void __ax25_put_route(ax25_route *ax25_rt); 199 200static inline void ax25_put_route(ax25_route *ax25_rt) 201{ 202 if (atomic_dec_and_test(&ax25_rt->refcount)) 203 __ax25_put_route(ax25_rt); 204} 205 206typedef struct { 207 char slave; /* slave_mode? */ 208 struct timer_list slave_timer; /* timeout timer */ 209 unsigned short slave_timeout; /* when? */ 210} ax25_dama_info; 211 212struct ctl_table; 213 214typedef struct ax25_dev { 215 struct ax25_dev *next; 216 struct net_device *dev; 217 struct net_device *forward; 218 struct ctl_table *systable; 219 int values[AX25_MAX_VALUES]; 220#if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER) 221 ax25_dama_info dama; 222#endif 223} ax25_dev; 224 225typedef struct ax25_cb { 226 struct hlist_node ax25_node; 227 ax25_address source_addr, dest_addr; 228 ax25_digi *digipeat; 229 ax25_dev *ax25_dev; 230 unsigned char iamdigi; 231 unsigned char state, modulus, pidincl; 232 unsigned short vs, vr, va; 233 unsigned char condition, backoff; 234 unsigned char n2, n2count; 235 struct timer_list t1timer, t2timer, t3timer, idletimer; 236 unsigned long t1, t2, t3, idle, rtt; 237 unsigned short paclen, fragno, fraglen; 238 struct sk_buff_head write_queue; 239 struct sk_buff_head reseq_queue; 240 struct sk_buff_head ack_queue; 241 struct sk_buff_head frag_queue; 242 unsigned char window; 243 struct timer_list timer, dtimer; 244 struct sock *sk; /* Backlink to socket */ 245 atomic_t refcount; 246} ax25_cb; 247 248#define ax25_sk(__sk) ((ax25_cb *)(__sk)->sk_protinfo) 249 250#define ax25_for_each(__ax25, node, list) \ 251 hlist_for_each_entry(__ax25, node, list, ax25_node) 252 253#define ax25_cb_hold(__ax25) \ 254 atomic_inc(&((__ax25)->refcount)) 255 256static __inline__ void ax25_cb_put(ax25_cb *ax25) 257{ 258 if (atomic_dec_and_test(&ax25->refcount)) { 259 kfree(ax25->digipeat); 260 kfree(ax25); 261 } 262} 263 264static inline __be16 ax25_type_trans(struct sk_buff *skb, struct net_device *dev) 265{ 266 skb->dev = dev; 267 skb_reset_mac_header(skb); 268 skb->pkt_type = PACKET_HOST; 269 return htons(ETH_P_AX25); 270} 271 272/* af_ax25.c */ 273extern struct hlist_head ax25_list; 274extern spinlock_t ax25_list_lock; 275extern void ax25_cb_add(ax25_cb *); 276struct sock *ax25_find_listener(ax25_address *, int, struct net_device *, int); 277struct sock *ax25_get_socket(ax25_address *, ax25_address *, int); 278extern ax25_cb *ax25_find_cb(ax25_address *, ax25_address *, ax25_digi *, struct net_device *); 279extern void ax25_send_to_raw(ax25_address *, struct sk_buff *, int); 280extern void ax25_destroy_socket(ax25_cb *); 281extern ax25_cb * __must_check ax25_create_cb(void); 282extern void ax25_fillin_cb(ax25_cb *, ax25_dev *); 283extern struct sock *ax25_make_new(struct sock *, struct ax25_dev *); 284 285/* ax25_addr.c */ 286extern const ax25_address ax25_bcast; 287extern const ax25_address ax25_defaddr; 288extern const ax25_address null_ax25_address; 289extern char *ax2asc(char *buf, const ax25_address *); 290extern void asc2ax(ax25_address *addr, const char *callsign); 291extern int ax25cmp(const ax25_address *, const ax25_address *); 292extern int ax25digicmp(const ax25_digi *, const ax25_digi *); 293extern const unsigned char *ax25_addr_parse(const unsigned char *, int, 294 ax25_address *, ax25_address *, ax25_digi *, int *, int *); 295extern int ax25_addr_build(unsigned char *, const ax25_address *, 296 const ax25_address *, const ax25_digi *, int, int); 297extern int ax25_addr_size(const ax25_digi *); 298extern void ax25_digi_invert(const ax25_digi *, ax25_digi *); 299 300/* ax25_dev.c */ 301extern ax25_dev *ax25_dev_list; 302extern spinlock_t ax25_dev_lock; 303 304static inline ax25_dev *ax25_dev_ax25dev(struct net_device *dev) 305{ 306 return dev->ax25_ptr; 307} 308 309extern ax25_dev *ax25_addr_ax25dev(ax25_address *); 310extern void ax25_dev_device_up(struct net_device *); 311extern void ax25_dev_device_down(struct net_device *); 312extern int ax25_fwd_ioctl(unsigned int, struct ax25_fwd_struct *); 313extern struct net_device *ax25_fwd_dev(struct net_device *); 314extern void ax25_dev_free(void); 315 316/* ax25_ds_in.c */ 317extern int ax25_ds_frame_in(ax25_cb *, struct sk_buff *, int); 318 319/* ax25_ds_subr.c */ 320extern void ax25_ds_nr_error_recovery(ax25_cb *); 321extern void ax25_ds_enquiry_response(ax25_cb *); 322extern void ax25_ds_establish_data_link(ax25_cb *); 323extern void ax25_dev_dama_off(ax25_dev *); 324extern void ax25_dama_on(ax25_cb *); 325extern void ax25_dama_off(ax25_cb *); 326 327/* ax25_ds_timer.c */ 328extern void ax25_ds_setup_timer(ax25_dev *); 329extern void ax25_ds_set_timer(ax25_dev *); 330extern void ax25_ds_del_timer(ax25_dev *); 331extern void ax25_ds_timer(ax25_cb *); 332extern void ax25_ds_t1_timeout(ax25_cb *); 333extern void ax25_ds_heartbeat_expiry(ax25_cb *); 334extern void ax25_ds_t3timer_expiry(ax25_cb *); 335extern void ax25_ds_idletimer_expiry(ax25_cb *); 336 337/* ax25_iface.c */ 338 339struct ax25_protocol { 340 struct ax25_protocol *next; 341 unsigned int pid; 342 int (*func)(struct sk_buff *, ax25_cb *); 343}; 344 345extern void ax25_register_pid(struct ax25_protocol *ap); 346extern void ax25_protocol_release(unsigned int); 347 348struct ax25_linkfail { 349 struct hlist_node lf_node; 350 void (*func)(ax25_cb *, int); 351}; 352 353extern void ax25_linkfail_register(struct ax25_linkfail *lf); 354extern void ax25_linkfail_release(struct ax25_linkfail *lf); 355extern int __must_check ax25_listen_register(ax25_address *, 356 struct net_device *); 357extern void ax25_listen_release(ax25_address *, struct net_device *); 358extern int (*ax25_protocol_function(unsigned int))(struct sk_buff *, ax25_cb *); 359extern int ax25_listen_mine(ax25_address *, struct net_device *); 360extern void ax25_link_failed(ax25_cb *, int); 361extern int ax25_protocol_is_registered(unsigned int); 362 363/* ax25_in.c */ 364extern int ax25_rx_iframe(ax25_cb *, struct sk_buff *); 365extern int ax25_kiss_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *); 366 367/* ax25_ip.c */ 368extern int ax25_hard_header(struct sk_buff *, struct net_device *, 369 unsigned short, const void *, 370 const void *, unsigned int); 371extern int ax25_rebuild_header(struct sk_buff *); 372extern const struct header_ops ax25_header_ops; 373 374/* ax25_out.c */ 375extern ax25_cb *ax25_send_frame(struct sk_buff *, int, ax25_address *, ax25_address *, ax25_digi *, struct net_device *); 376extern void ax25_output(ax25_cb *, int, struct sk_buff *); 377extern void ax25_kick(ax25_cb *); 378extern void ax25_transmit_buffer(ax25_cb *, struct sk_buff *, int); 379extern void ax25_queue_xmit(struct sk_buff *skb, struct net_device *dev); 380extern int ax25_check_iframes_acked(ax25_cb *, unsigned short); 381 382/* ax25_route.c */ 383extern void ax25_rt_device_down(struct net_device *); 384extern int ax25_rt_ioctl(unsigned int, void __user *); 385extern const struct file_operations ax25_route_fops; 386extern ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev); 387extern int ax25_rt_autobind(ax25_cb *, ax25_address *); 388extern struct sk_buff *ax25_rt_build_path(struct sk_buff *, ax25_address *, ax25_address *, ax25_digi *); 389extern void ax25_rt_free(void); 390 391/* ax25_std_in.c */ 392extern int ax25_std_frame_in(ax25_cb *, struct sk_buff *, int); 393 394/* ax25_std_subr.c */ 395extern void ax25_std_nr_error_recovery(ax25_cb *); 396extern void ax25_std_establish_data_link(ax25_cb *); 397extern void ax25_std_transmit_enquiry(ax25_cb *); 398extern void ax25_std_enquiry_response(ax25_cb *); 399extern void ax25_std_timeout_response(ax25_cb *); 400 401/* ax25_std_timer.c */ 402extern void ax25_std_heartbeat_expiry(ax25_cb *); 403extern void ax25_std_t1timer_expiry(ax25_cb *); 404extern void ax25_std_t2timer_expiry(ax25_cb *); 405extern void ax25_std_t3timer_expiry(ax25_cb *); 406extern void ax25_std_idletimer_expiry(ax25_cb *); 407 408/* ax25_subr.c */ 409extern void ax25_clear_queues(ax25_cb *); 410extern void ax25_frames_acked(ax25_cb *, unsigned short); 411extern void ax25_requeue_frames(ax25_cb *); 412extern int ax25_validate_nr(ax25_cb *, unsigned short); 413extern int ax25_decode(ax25_cb *, struct sk_buff *, int *, int *, int *); 414extern void ax25_send_control(ax25_cb *, int, int, int); 415extern void ax25_return_dm(struct net_device *, ax25_address *, ax25_address *, ax25_digi *); 416extern void ax25_calculate_t1(ax25_cb *); 417extern void ax25_calculate_rtt(ax25_cb *); 418extern void ax25_disconnect(ax25_cb *, int); 419 420/* ax25_timer.c */ 421extern void ax25_setup_timers(ax25_cb *); 422extern void ax25_start_heartbeat(ax25_cb *); 423extern void ax25_start_t1timer(ax25_cb *); 424extern void ax25_start_t2timer(ax25_cb *); 425extern void ax25_start_t3timer(ax25_cb *); 426extern void ax25_start_idletimer(ax25_cb *); 427extern void ax25_stop_heartbeat(ax25_cb *); 428extern void ax25_stop_t1timer(ax25_cb *); 429extern void ax25_stop_t2timer(ax25_cb *); 430extern void ax25_stop_t3timer(ax25_cb *); 431extern void ax25_stop_idletimer(ax25_cb *); 432extern int ax25_t1timer_running(ax25_cb *); 433extern unsigned long ax25_display_timer(struct timer_list *); 434 435/* ax25_uid.c */ 436extern int ax25_uid_policy; 437extern ax25_uid_assoc *ax25_findbyuid(uid_t); 438extern int __must_check ax25_uid_ioctl(int, struct sockaddr_ax25 *); 439extern const struct file_operations ax25_uid_fops; 440extern void ax25_uid_free(void); 441 442/* sysctl_net_ax25.c */ 443#ifdef CONFIG_SYSCTL 444extern void ax25_register_sysctl(void); 445extern void ax25_unregister_sysctl(void); 446#else 447static inline void ax25_register_sysctl(void) {}; 448static inline void ax25_unregister_sysctl(void) {}; 449#endif /* CONFIG_SYSCTL */ 450 451#endif 452