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 17#define AX25_T1CLAMPLO 1 18#define AX25_T1CLAMPHI (30 * HZ) 19 20#define AX25_BPQ_HEADER_LEN 16 21#define AX25_KISS_HEADER_LEN 1 22 23#define AX25_HEADER_LEN 17 24#define AX25_ADDR_LEN 7 25#define AX25_DIGI_HEADER_LEN (AX25_MAX_DIGIS * AX25_ADDR_LEN) 26#define AX25_MAX_HEADER_LEN (AX25_HEADER_LEN + AX25_DIGI_HEADER_LEN) 27 28/* AX.25 Protocol IDs */ 29#define AX25_P_ROSE 0x01 30#define AX25_P_VJCOMP 0x06 /* Compressed TCP/IP packet */ 31 /* Van Jacobsen (RFC 1144) */ 32#define AX25_P_VJUNCOMP 0x07 /* Uncompressed TCP/IP packet */ 33 /* Van Jacobsen (RFC 1144) */ 34#define AX25_P_SEGMENT 0x08 /* Segmentation fragment */ 35#define AX25_P_TEXNET 0xc3 /* TEXTNET datagram protocol */ 36#define AX25_P_LQ 0xc4 /* Link Quality Protocol */ 37#define AX25_P_ATALK 0xca /* Appletalk */ 38#define AX25_P_ATALK_ARP 0xcb /* Appletalk ARP */ 39#define AX25_P_IP 0xcc /* ARPA Internet Protocol */ 40#define AX25_P_ARP 0xcd /* ARPA Address Resolution */ 41#define AX25_P_FLEXNET 0xce /* FlexNet */ 42#define AX25_P_NETROM 0xcf /* NET/ROM */ 43#define AX25_P_TEXT 0xF0 /* No layer 3 protocol impl. */ 44 45/* AX.25 Segment control values */ 46#define AX25_SEG_REM 0x7F 47#define AX25_SEG_FIRST 0x80 48 49#define AX25_CBIT 0x80 /* Command/Response bit */ 50#define AX25_EBIT 0x01 /* HDLC Address Extension bit */ 51#define AX25_HBIT 0x80 /* Has been repeated bit */ 52 53#define AX25_SSSID_SPARE 0x60 /* Unused bits in SSID for standard AX.25 */ 54#define AX25_ESSID_SPARE 0x20 /* Unused bits in SSID for extended AX.25 */ 55#define AX25_DAMA_FLAG 0x20 /* Well, it is *NOT* unused! (dl1bke 951121 */ 56 57#define AX25_COND_ACK_PENDING 0x01 58#define AX25_COND_REJECT 0x02 59#define AX25_COND_PEER_RX_BUSY 0x04 60#define AX25_COND_OWN_RX_BUSY 0x08 61#define AX25_COND_DAMA_MODE 0x10 62 63#ifndef _LINUX_NETDEVICE_H 64#include <linux/netdevice.h> 65#endif 66 67/* Upper sub-layer (LAPB) definitions */ 68 69/* Control field templates */ 70#define AX25_I 0x00 /* Information frames */ 71#define AX25_S 0x01 /* Supervisory frames */ 72#define AX25_RR 0x01 /* Receiver ready */ 73#define AX25_RNR 0x05 /* Receiver not ready */ 74#define AX25_REJ 0x09 /* Reject */ 75#define AX25_U 0x03 /* Unnumbered frames */ 76#define AX25_SABM 0x2f /* Set Asynchronous Balanced Mode */ 77#define AX25_SABME 0x6f /* Set Asynchronous Balanced Mode Extended */ 78#define AX25_DISC 0x43 /* Disconnect */ 79#define AX25_DM 0x0f /* Disconnected mode */ 80#define AX25_UA 0x63 /* Unnumbered acknowledge */ 81#define AX25_FRMR 0x87 /* Frame reject */ 82#define AX25_UI 0x03 /* Unnumbered information */ 83#define AX25_XID 0xaf /* Exchange information */ 84#define AX25_TEST 0xe3 /* Test */ 85 86#define AX25_PF 0x10 /* Poll/final bit for standard AX.25 */ 87#define AX25_EPF 0x01 /* Poll/final bit for extended AX.25 */ 88 89#define AX25_ILLEGAL 0x100 /* Impossible to be a real frame type */ 90 91#define AX25_POLLOFF 0 92#define AX25_POLLON 1 93 94/* AX25 L2 C-bit */ 95#define AX25_COMMAND 1 96#define AX25_RESPONSE 2 97 98/* Define Link State constants. */ 99 100enum { 101 AX25_STATE_0, /* Listening */ 102 AX25_STATE_1, /* SABM sent */ 103 AX25_STATE_2, /* DISC sent */ 104 AX25_STATE_3, /* Established */ 105 AX25_STATE_4 /* Recovery */ 106}; 107 108#define AX25_MODULUS 8 /* Standard AX.25 modulus */ 109#define AX25_EMODULUS 128 /* Extended AX.25 modulus */ 110 111enum { 112 AX25_PROTO_STD_SIMPLEX, 113 AX25_PROTO_STD_DUPLEX, 114#ifdef CONFIG_AX25_DAMA_SLAVE 115 AX25_PROTO_DAMA_SLAVE, 116#ifdef CONFIG_AX25_DAMA_MASTER 117 AX25_PROTO_DAMA_MASTER, 118#define AX25_PROTO_MAX AX25_PROTO_DAMA_MASTER 119#endif 120#endif 121 __AX25_PROTO_MAX, 122 AX25_PROTO_MAX = __AX25_PROTO_MAX -1 123}; 124 125enum { 126 AX25_VALUES_IPDEFMODE, /* 0=DG 1=VC */ 127 AX25_VALUES_AXDEFMODE, /* 0=Normal 1=Extended Seq Nos */ 128 AX25_VALUES_BACKOFF, /* 0=None 1=Linear 2=Exponential */ 129 AX25_VALUES_CONMODE, /* Allow connected modes - 0=No 1=no "PID text" 2=all PIDs */ 130 AX25_VALUES_WINDOW, /* Default window size for standard AX.25 */ 131 AX25_VALUES_EWINDOW, /* Default window size for extended AX.25 */ 132 AX25_VALUES_T1, /* Default T1 timeout value */ 133 AX25_VALUES_T2, /* Default T2 timeout value */ 134 AX25_VALUES_T3, /* Default T3 timeout value */ 135 AX25_VALUES_IDLE, /* Connected mode idle timer */ 136 AX25_VALUES_N2, /* Default N2 value */ 137 AX25_VALUES_PACLEN, /* AX.25 MTU */ 138 AX25_VALUES_PROTOCOL, /* Std AX.25, DAMA Slave, DAMA Master */ 139 AX25_VALUES_DS_TIMEOUT, /* DAMA Slave timeout */ 140 AX25_MAX_VALUES /* THIS MUST REMAIN THE LAST ENTRY OF THIS LIST */ 141}; 142 143#define AX25_DEF_IPDEFMODE 0 /* Datagram */ 144#define AX25_DEF_AXDEFMODE 0 /* Normal */ 145#define AX25_DEF_BACKOFF 1 /* Linear backoff */ 146#define AX25_DEF_CONMODE 2 /* Connected mode allowed */ 147#define AX25_DEF_WINDOW 2 /* Window=2 */ 148#define AX25_DEF_EWINDOW 32 /* Module-128 Window=32 */ 149#define AX25_DEF_T1 10000 /* T1=10s */ 150#define AX25_DEF_T2 3000 /* T2=3s */ 151#define AX25_DEF_T3 300000 /* T3=300s */ 152#define AX25_DEF_N2 10 /* N2=10 */ 153#define AX25_DEF_IDLE 0 /* Idle=None */ 154#define AX25_DEF_PACLEN 256 /* Paclen=256 */ 155#define AX25_DEF_PROTOCOL AX25_PROTO_STD_SIMPLEX /* Standard AX.25 */ 156#define AX25_DEF_DS_TIMEOUT 180000 /* DAMA timeout 3 minutes */ 157 158typedef struct ax25_uid_assoc { 159 struct hlist_node uid_node; 160 atomic_t refcount; 161 kuid_t uid; 162 ax25_address call; 163} ax25_uid_assoc; 164 165#define ax25_uid_for_each(__ax25, list) \ 166 hlist_for_each_entry(__ax25, list, uid_node) 167 168#define ax25_uid_hold(ax25) \ 169 atomic_inc(&((ax25)->refcount)) 170 171static inline void ax25_uid_put(ax25_uid_assoc *assoc) 172{ 173 if (atomic_dec_and_test(&assoc->refcount)) { 174 kfree(assoc); 175 } 176} 177 178typedef struct { 179 ax25_address calls[AX25_MAX_DIGIS]; 180 unsigned char repeated[AX25_MAX_DIGIS]; 181 unsigned char ndigi; 182 signed char lastrepeat; 183} ax25_digi; 184 185typedef struct ax25_route { 186 struct ax25_route *next; 187 atomic_t refcount; 188 ax25_address callsign; 189 struct net_device *dev; 190 ax25_digi *digipeat; 191 char ip_mode; 192} ax25_route; 193 194static inline void ax25_hold_route(ax25_route *ax25_rt) 195{ 196 atomic_inc(&ax25_rt->refcount); 197} 198 199void __ax25_put_route(ax25_route *ax25_rt); 200 201static inline void ax25_put_route(ax25_route *ax25_rt) 202{ 203 if (atomic_dec_and_test(&ax25_rt->refcount)) 204 __ax25_put_route(ax25_rt); 205} 206 207typedef struct { 208 char slave; /* slave_mode? */ 209 struct timer_list slave_timer; /* timeout timer */ 210 unsigned short slave_timeout; /* when? */ 211} ax25_dama_info; 212 213struct ctl_table; 214 215typedef struct ax25_dev { 216 struct ax25_dev *next; 217 struct net_device *dev; 218 struct net_device *forward; 219 struct ctl_table_header *sysheader; 220 int values[AX25_MAX_VALUES]; 221#if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER) 222 ax25_dama_info dama; 223#endif 224} ax25_dev; 225 226typedef struct ax25_cb { 227 struct hlist_node ax25_node; 228 ax25_address source_addr, dest_addr; 229 ax25_digi *digipeat; 230 ax25_dev *ax25_dev; 231 unsigned char iamdigi; 232 unsigned char state, modulus, pidincl; 233 unsigned short vs, vr, va; 234 unsigned char condition, backoff; 235 unsigned char n2, n2count; 236 struct timer_list t1timer, t2timer, t3timer, idletimer; 237 unsigned long t1, t2, t3, idle, rtt; 238 unsigned short paclen, fragno, fraglen; 239 struct sk_buff_head write_queue; 240 struct sk_buff_head reseq_queue; 241 struct sk_buff_head ack_queue; 242 struct sk_buff_head frag_queue; 243 unsigned char window; 244 struct timer_list timer, dtimer; 245 struct sock *sk; /* Backlink to socket */ 246 atomic_t refcount; 247} ax25_cb; 248 249#define ax25_sk(__sk) ((ax25_cb *)(__sk)->sk_protinfo) 250 251#define ax25_for_each(__ax25, list) \ 252 hlist_for_each_entry(__ax25, list, ax25_node) 253 254#define ax25_cb_hold(__ax25) \ 255 atomic_inc(&((__ax25)->refcount)) 256 257static __inline__ void ax25_cb_put(ax25_cb *ax25) 258{ 259 if (atomic_dec_and_test(&ax25->refcount)) { 260 kfree(ax25->digipeat); 261 kfree(ax25); 262 } 263} 264 265static inline __be16 ax25_type_trans(struct sk_buff *skb, struct net_device *dev) 266{ 267 skb->dev = dev; 268 skb_reset_mac_header(skb); 269 skb->pkt_type = PACKET_HOST; 270 return htons(ETH_P_AX25); 271} 272 273/* af_ax25.c */ 274extern struct hlist_head ax25_list; 275extern spinlock_t ax25_list_lock; 276void ax25_cb_add(ax25_cb *); 277struct sock *ax25_find_listener(ax25_address *, int, struct net_device *, int); 278struct sock *ax25_get_socket(ax25_address *, ax25_address *, int); 279ax25_cb *ax25_find_cb(ax25_address *, ax25_address *, ax25_digi *, 280 struct net_device *); 281void ax25_send_to_raw(ax25_address *, struct sk_buff *, int); 282void ax25_destroy_socket(ax25_cb *); 283ax25_cb * __must_check ax25_create_cb(void); 284void ax25_fillin_cb(ax25_cb *, ax25_dev *); 285struct sock *ax25_make_new(struct sock *, struct ax25_dev *); 286 287/* ax25_addr.c */ 288extern const ax25_address ax25_bcast; 289extern const ax25_address ax25_defaddr; 290extern const ax25_address null_ax25_address; 291char *ax2asc(char *buf, const ax25_address *); 292void asc2ax(ax25_address *addr, const char *callsign); 293int ax25cmp(const ax25_address *, const ax25_address *); 294int ax25digicmp(const ax25_digi *, const ax25_digi *); 295const unsigned char *ax25_addr_parse(const unsigned char *, int, 296 ax25_address *, ax25_address *, ax25_digi *, int *, int *); 297int ax25_addr_build(unsigned char *, const ax25_address *, 298 const ax25_address *, const ax25_digi *, int, int); 299int ax25_addr_size(const ax25_digi *); 300void ax25_digi_invert(const ax25_digi *, ax25_digi *); 301 302/* ax25_dev.c */ 303extern ax25_dev *ax25_dev_list; 304extern spinlock_t ax25_dev_lock; 305 306static inline ax25_dev *ax25_dev_ax25dev(struct net_device *dev) 307{ 308 return dev->ax25_ptr; 309} 310 311ax25_dev *ax25_addr_ax25dev(ax25_address *); 312void ax25_dev_device_up(struct net_device *); 313void ax25_dev_device_down(struct net_device *); 314int ax25_fwd_ioctl(unsigned int, struct ax25_fwd_struct *); 315struct net_device *ax25_fwd_dev(struct net_device *); 316void ax25_dev_free(void); 317 318/* ax25_ds_in.c */ 319int ax25_ds_frame_in(ax25_cb *, struct sk_buff *, int); 320 321/* ax25_ds_subr.c */ 322void ax25_ds_nr_error_recovery(ax25_cb *); 323void ax25_ds_enquiry_response(ax25_cb *); 324void ax25_ds_establish_data_link(ax25_cb *); 325void ax25_dev_dama_off(ax25_dev *); 326void ax25_dama_on(ax25_cb *); 327void ax25_dama_off(ax25_cb *); 328 329/* ax25_ds_timer.c */ 330void ax25_ds_setup_timer(ax25_dev *); 331void ax25_ds_set_timer(ax25_dev *); 332void ax25_ds_del_timer(ax25_dev *); 333void ax25_ds_timer(ax25_cb *); 334void ax25_ds_t1_timeout(ax25_cb *); 335void ax25_ds_heartbeat_expiry(ax25_cb *); 336void ax25_ds_t3timer_expiry(ax25_cb *); 337void ax25_ds_idletimer_expiry(ax25_cb *); 338 339/* ax25_iface.c */ 340 341struct ax25_protocol { 342 struct ax25_protocol *next; 343 unsigned int pid; 344 int (*func)(struct sk_buff *, ax25_cb *); 345}; 346 347void ax25_register_pid(struct ax25_protocol *ap); 348void ax25_protocol_release(unsigned int); 349 350struct ax25_linkfail { 351 struct hlist_node lf_node; 352 void (*func)(ax25_cb *, int); 353}; 354 355void ax25_linkfail_register(struct ax25_linkfail *lf); 356void ax25_linkfail_release(struct ax25_linkfail *lf); 357int __must_check ax25_listen_register(ax25_address *, struct net_device *); 358void ax25_listen_release(ax25_address *, struct net_device *); 359int(*ax25_protocol_function(unsigned int))(struct sk_buff *, ax25_cb *); 360int ax25_listen_mine(ax25_address *, struct net_device *); 361void ax25_link_failed(ax25_cb *, int); 362int ax25_protocol_is_registered(unsigned int); 363 364/* ax25_in.c */ 365int ax25_rx_iframe(ax25_cb *, struct sk_buff *); 366int ax25_kiss_rcv(struct sk_buff *, struct net_device *, struct packet_type *, 367 struct net_device *); 368 369/* ax25_ip.c */ 370netdev_tx_t ax25_ip_xmit(struct sk_buff *skb); 371extern const struct header_ops ax25_header_ops; 372 373/* ax25_out.c */ 374ax25_cb *ax25_send_frame(struct sk_buff *, int, ax25_address *, ax25_address *, 375 ax25_digi *, struct net_device *); 376void ax25_output(ax25_cb *, int, struct sk_buff *); 377void ax25_kick(ax25_cb *); 378void ax25_transmit_buffer(ax25_cb *, struct sk_buff *, int); 379void ax25_queue_xmit(struct sk_buff *skb, struct net_device *dev); 380int ax25_check_iframes_acked(ax25_cb *, unsigned short); 381 382/* ax25_route.c */ 383void ax25_rt_device_down(struct net_device *); 384int ax25_rt_ioctl(unsigned int, void __user *); 385extern const struct file_operations ax25_route_fops; 386ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev); 387int ax25_rt_autobind(ax25_cb *, ax25_address *); 388struct sk_buff *ax25_rt_build_path(struct sk_buff *, ax25_address *, 389 ax25_address *, ax25_digi *); 390void ax25_rt_free(void); 391 392/* ax25_std_in.c */ 393int ax25_std_frame_in(ax25_cb *, struct sk_buff *, int); 394 395/* ax25_std_subr.c */ 396void ax25_std_nr_error_recovery(ax25_cb *); 397void ax25_std_establish_data_link(ax25_cb *); 398void ax25_std_transmit_enquiry(ax25_cb *); 399void ax25_std_enquiry_response(ax25_cb *); 400void ax25_std_timeout_response(ax25_cb *); 401 402/* ax25_std_timer.c */ 403void ax25_std_heartbeat_expiry(ax25_cb *); 404void ax25_std_t1timer_expiry(ax25_cb *); 405void ax25_std_t2timer_expiry(ax25_cb *); 406void ax25_std_t3timer_expiry(ax25_cb *); 407void ax25_std_idletimer_expiry(ax25_cb *); 408 409/* ax25_subr.c */ 410void ax25_clear_queues(ax25_cb *); 411void ax25_frames_acked(ax25_cb *, unsigned short); 412void ax25_requeue_frames(ax25_cb *); 413int ax25_validate_nr(ax25_cb *, unsigned short); 414int ax25_decode(ax25_cb *, struct sk_buff *, int *, int *, int *); 415void ax25_send_control(ax25_cb *, int, int, int); 416void ax25_return_dm(struct net_device *, ax25_address *, ax25_address *, 417 ax25_digi *); 418void ax25_calculate_t1(ax25_cb *); 419void ax25_calculate_rtt(ax25_cb *); 420void ax25_disconnect(ax25_cb *, int); 421 422/* ax25_timer.c */ 423void ax25_setup_timers(ax25_cb *); 424void ax25_start_heartbeat(ax25_cb *); 425void ax25_start_t1timer(ax25_cb *); 426void ax25_start_t2timer(ax25_cb *); 427void ax25_start_t3timer(ax25_cb *); 428void ax25_start_idletimer(ax25_cb *); 429void ax25_stop_heartbeat(ax25_cb *); 430void ax25_stop_t1timer(ax25_cb *); 431void ax25_stop_t2timer(ax25_cb *); 432void ax25_stop_t3timer(ax25_cb *); 433void ax25_stop_idletimer(ax25_cb *); 434int ax25_t1timer_running(ax25_cb *); 435unsigned long ax25_display_timer(struct timer_list *); 436 437/* ax25_uid.c */ 438extern int ax25_uid_policy; 439ax25_uid_assoc *ax25_findbyuid(kuid_t); 440int __must_check ax25_uid_ioctl(int, struct sockaddr_ax25 *); 441extern const struct file_operations ax25_uid_fops; 442void ax25_uid_free(void); 443 444/* sysctl_net_ax25.c */ 445#ifdef CONFIG_SYSCTL 446int ax25_register_dev_sysctl(ax25_dev *ax25_dev); 447void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev); 448#else 449static inline int ax25_register_dev_sysctl(ax25_dev *ax25_dev) { return 0; } 450static inline void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev) {} 451#endif /* CONFIG_SYSCTL */ 452 453#endif 454