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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#include <net/sock.h>
17
18#define AX25_T1CLAMPLO 1
19#define AX25_T1CLAMPHI (30 * HZ)
20
21#define AX25_BPQ_HEADER_LEN 16
22#define AX25_KISS_HEADER_LEN 1
23
24#define AX25_HEADER_LEN 17
25#define AX25_ADDR_LEN 7
26#define AX25_DIGI_HEADER_LEN (AX25_MAX_DIGIS * AX25_ADDR_LEN)
27#define AX25_MAX_HEADER_LEN (AX25_HEADER_LEN + AX25_DIGI_HEADER_LEN)
28
29/* AX.25 Protocol IDs */
30#define AX25_P_ROSE 0x01
31#define AX25_P_VJCOMP 0x06 /* Compressed TCP/IP packet */
32 /* Van Jacobsen (RFC 1144) */
33#define AX25_P_VJUNCOMP 0x07 /* Uncompressed TCP/IP packet */
34 /* Van Jacobsen (RFC 1144) */
35#define AX25_P_SEGMENT 0x08 /* Segmentation fragment */
36#define AX25_P_TEXNET 0xc3 /* TEXTNET datagram protocol */
37#define AX25_P_LQ 0xc4 /* Link Quality Protocol */
38#define AX25_P_ATALK 0xca /* Appletalk */
39#define AX25_P_ATALK_ARP 0xcb /* Appletalk ARP */
40#define AX25_P_IP 0xcc /* ARPA Internet Protocol */
41#define AX25_P_ARP 0xcd /* ARPA Address Resolution */
42#define AX25_P_FLEXNET 0xce /* FlexNet */
43#define AX25_P_NETROM 0xcf /* NET/ROM */
44#define AX25_P_TEXT 0xF0 /* No layer 3 protocol impl. */
45
46/* AX.25 Segment control values */
47#define AX25_SEG_REM 0x7F
48#define AX25_SEG_FIRST 0x80
49
50#define AX25_CBIT 0x80 /* Command/Response bit */
51#define AX25_EBIT 0x01 /* HDLC Address Extension bit */
52#define AX25_HBIT 0x80 /* Has been repeated bit */
53
54#define AX25_SSSID_SPARE 0x60 /* Unused bits in SSID for standard AX.25 */
55#define AX25_ESSID_SPARE 0x20 /* Unused bits in SSID for extended AX.25 */
56#define AX25_DAMA_FLAG 0x20 /* Well, it is *NOT* unused! (dl1bke 951121 */
57
58#define AX25_COND_ACK_PENDING 0x01
59#define AX25_COND_REJECT 0x02
60#define AX25_COND_PEER_RX_BUSY 0x04
61#define AX25_COND_OWN_RX_BUSY 0x08
62#define AX25_COND_DAMA_MODE 0x10
63
64#ifndef _LINUX_NETDEVICE_H
65#include <linux/netdevice.h>
66#endif
67
68/* Upper sub-layer (LAPB) definitions */
69
70/* Control field templates */
71#define AX25_I 0x00 /* Information frames */
72#define AX25_S 0x01 /* Supervisory frames */
73#define AX25_RR 0x01 /* Receiver ready */
74#define AX25_RNR 0x05 /* Receiver not ready */
75#define AX25_REJ 0x09 /* Reject */
76#define AX25_U 0x03 /* Unnumbered frames */
77#define AX25_SABM 0x2f /* Set Asynchronous Balanced Mode */
78#define AX25_SABME 0x6f /* Set Asynchronous Balanced Mode Extended */
79#define AX25_DISC 0x43 /* Disconnect */
80#define AX25_DM 0x0f /* Disconnected mode */
81#define AX25_UA 0x63 /* Unnumbered acknowledge */
82#define AX25_FRMR 0x87 /* Frame reject */
83#define AX25_UI 0x03 /* Unnumbered information */
84#define AX25_XID 0xaf /* Exchange information */
85#define AX25_TEST 0xe3 /* Test */
86
87#define AX25_PF 0x10 /* Poll/final bit for standard AX.25 */
88#define AX25_EPF 0x01 /* Poll/final bit for extended AX.25 */
89
90#define AX25_ILLEGAL 0x100 /* Impossible to be a real frame type */
91
92#define AX25_POLLOFF 0
93#define AX25_POLLON 1
94
95/* AX25 L2 C-bit */
96#define AX25_COMMAND 1
97#define AX25_RESPONSE 2
98
99/* Define Link State constants. */
100
101enum {
102 AX25_STATE_0, /* Listening */
103 AX25_STATE_1, /* SABM sent */
104 AX25_STATE_2, /* DISC sent */
105 AX25_STATE_3, /* Established */
106 AX25_STATE_4 /* Recovery */
107};
108
109#define AX25_MODULUS 8 /* Standard AX.25 modulus */
110#define AX25_EMODULUS 128 /* Extended AX.25 modulus */
111
112enum {
113 AX25_PROTO_STD_SIMPLEX,
114 AX25_PROTO_STD_DUPLEX,
115#ifdef CONFIG_AX25_DAMA_SLAVE
116 AX25_PROTO_DAMA_SLAVE,
117#ifdef CONFIG_AX25_DAMA_MASTER
118 AX25_PROTO_DAMA_MASTER,
119#define AX25_PROTO_MAX AX25_PROTO_DAMA_MASTER
120#endif
121#endif
122 __AX25_PROTO_MAX,
123 AX25_PROTO_MAX = __AX25_PROTO_MAX -1
124};
125
126enum {
127 AX25_VALUES_IPDEFMODE, /* 0=DG 1=VC */
128 AX25_VALUES_AXDEFMODE, /* 0=Normal 1=Extended Seq Nos */
129 AX25_VALUES_BACKOFF, /* 0=None 1=Linear 2=Exponential */
130 AX25_VALUES_CONMODE, /* Allow connected modes - 0=No 1=no "PID text" 2=all PIDs */
131 AX25_VALUES_WINDOW, /* Default window size for standard AX.25 */
132 AX25_VALUES_EWINDOW, /* Default window size for extended AX.25 */
133 AX25_VALUES_T1, /* Default T1 timeout value */
134 AX25_VALUES_T2, /* Default T2 timeout value */
135 AX25_VALUES_T3, /* Default T3 timeout value */
136 AX25_VALUES_IDLE, /* Connected mode idle timer */
137 AX25_VALUES_N2, /* Default N2 value */
138 AX25_VALUES_PACLEN, /* AX.25 MTU */
139 AX25_VALUES_PROTOCOL, /* Std AX.25, DAMA Slave, DAMA Master */
140 AX25_VALUES_DS_TIMEOUT, /* DAMA Slave timeout */
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
159typedef struct ax25_uid_assoc {
160 struct hlist_node uid_node;
161 atomic_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 atomic_inc(&((ax25)->refcount))
171
172static inline void ax25_uid_put(ax25_uid_assoc *assoc)
173{
174 if (atomic_dec_and_test(&assoc->refcount)) {
175 kfree(assoc);
176 }
177}
178
179typedef 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
186typedef struct ax25_route {
187 struct ax25_route *next;
188 atomic_t refcount;
189 ax25_address callsign;
190 struct net_device *dev;
191 ax25_digi *digipeat;
192 char ip_mode;
193} ax25_route;
194
195static inline void ax25_hold_route(ax25_route *ax25_rt)
196{
197 atomic_inc(&ax25_rt->refcount);
198}
199
200void __ax25_put_route(ax25_route *ax25_rt);
201
202static inline void ax25_put_route(ax25_route *ax25_rt)
203{
204 if (atomic_dec_and_test(&ax25_rt->refcount))
205 __ax25_put_route(ax25_rt);
206}
207
208typedef 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
214struct ctl_table;
215
216typedef struct ax25_dev {
217 struct ax25_dev *next;
218 struct net_device *dev;
219 struct net_device *forward;
220 struct ctl_table_header *sysheader;
221 int values[AX25_MAX_VALUES];
222#if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER)
223 ax25_dama_info dama;
224#endif
225} ax25_dev;
226
227typedef struct ax25_cb {
228 struct hlist_node ax25_node;
229 ax25_address source_addr, dest_addr;
230 ax25_digi *digipeat;
231 ax25_dev *ax25_dev;
232 unsigned char iamdigi;
233 unsigned char state, modulus, pidincl;
234 unsigned short vs, vr, va;
235 unsigned char condition, backoff;
236 unsigned char n2, n2count;
237 struct timer_list t1timer, t2timer, t3timer, idletimer;
238 unsigned long t1, t2, t3, idle, rtt;
239 unsigned short paclen, fragno, fraglen;
240 struct sk_buff_head write_queue;
241 struct sk_buff_head reseq_queue;
242 struct sk_buff_head ack_queue;
243 struct sk_buff_head frag_queue;
244 unsigned char window;
245 struct timer_list timer, dtimer;
246 struct sock *sk; /* Backlink to socket */
247 atomic_t refcount;
248} ax25_cb;
249
250struct ax25_sock {
251 struct sock sk;
252 struct ax25_cb *cb;
253};
254
255static inline struct ax25_sock *ax25_sk(const struct sock *sk)
256{
257 return (struct ax25_sock *) sk;
258}
259
260static inline struct ax25_cb *sk_to_ax25(const struct sock *sk)
261{
262 return ax25_sk(sk)->cb;
263}
264
265#define ax25_for_each(__ax25, list) \
266 hlist_for_each_entry(__ax25, list, ax25_node)
267
268#define ax25_cb_hold(__ax25) \
269 atomic_inc(&((__ax25)->refcount))
270
271static __inline__ void ax25_cb_put(ax25_cb *ax25)
272{
273 if (atomic_dec_and_test(&ax25->refcount)) {
274 kfree(ax25->digipeat);
275 kfree(ax25);
276 }
277}
278
279static inline __be16 ax25_type_trans(struct sk_buff *skb, struct net_device *dev)
280{
281 skb->dev = dev;
282 skb_reset_mac_header(skb);
283 skb->pkt_type = PACKET_HOST;
284 return htons(ETH_P_AX25);
285}
286
287/* af_ax25.c */
288extern struct hlist_head ax25_list;
289extern spinlock_t ax25_list_lock;
290void ax25_cb_add(ax25_cb *);
291struct sock *ax25_find_listener(ax25_address *, int, struct net_device *, int);
292struct sock *ax25_get_socket(ax25_address *, ax25_address *, int);
293ax25_cb *ax25_find_cb(ax25_address *, ax25_address *, ax25_digi *,
294 struct net_device *);
295void ax25_send_to_raw(ax25_address *, struct sk_buff *, int);
296void ax25_destroy_socket(ax25_cb *);
297ax25_cb * __must_check ax25_create_cb(void);
298void ax25_fillin_cb(ax25_cb *, ax25_dev *);
299struct sock *ax25_make_new(struct sock *, struct ax25_dev *);
300
301/* ax25_addr.c */
302extern const ax25_address ax25_bcast;
303extern const ax25_address ax25_defaddr;
304extern const ax25_address null_ax25_address;
305char *ax2asc(char *buf, const ax25_address *);
306void asc2ax(ax25_address *addr, const char *callsign);
307int ax25cmp(const ax25_address *, const ax25_address *);
308int ax25digicmp(const ax25_digi *, const ax25_digi *);
309const unsigned char *ax25_addr_parse(const unsigned char *, int,
310 ax25_address *, ax25_address *, ax25_digi *, int *, int *);
311int ax25_addr_build(unsigned char *, const ax25_address *,
312 const ax25_address *, const ax25_digi *, int, int);
313int ax25_addr_size(const ax25_digi *);
314void ax25_digi_invert(const ax25_digi *, ax25_digi *);
315
316/* ax25_dev.c */
317extern ax25_dev *ax25_dev_list;
318extern spinlock_t ax25_dev_lock;
319
320static inline ax25_dev *ax25_dev_ax25dev(struct net_device *dev)
321{
322 return dev->ax25_ptr;
323}
324
325ax25_dev *ax25_addr_ax25dev(ax25_address *);
326void ax25_dev_device_up(struct net_device *);
327void ax25_dev_device_down(struct net_device *);
328int ax25_fwd_ioctl(unsigned int, struct ax25_fwd_struct *);
329struct net_device *ax25_fwd_dev(struct net_device *);
330void ax25_dev_free(void);
331
332/* ax25_ds_in.c */
333int ax25_ds_frame_in(ax25_cb *, struct sk_buff *, int);
334
335/* ax25_ds_subr.c */
336void ax25_ds_nr_error_recovery(ax25_cb *);
337void ax25_ds_enquiry_response(ax25_cb *);
338void ax25_ds_establish_data_link(ax25_cb *);
339void ax25_dev_dama_off(ax25_dev *);
340void ax25_dama_on(ax25_cb *);
341void ax25_dama_off(ax25_cb *);
342
343/* ax25_ds_timer.c */
344void ax25_ds_setup_timer(ax25_dev *);
345void ax25_ds_set_timer(ax25_dev *);
346void ax25_ds_del_timer(ax25_dev *);
347void ax25_ds_timer(ax25_cb *);
348void ax25_ds_t1_timeout(ax25_cb *);
349void ax25_ds_heartbeat_expiry(ax25_cb *);
350void ax25_ds_t3timer_expiry(ax25_cb *);
351void ax25_ds_idletimer_expiry(ax25_cb *);
352
353/* ax25_iface.c */
354
355struct ax25_protocol {
356 struct ax25_protocol *next;
357 unsigned int pid;
358 int (*func)(struct sk_buff *, ax25_cb *);
359};
360
361void ax25_register_pid(struct ax25_protocol *ap);
362void ax25_protocol_release(unsigned int);
363
364struct ax25_linkfail {
365 struct hlist_node lf_node;
366 void (*func)(ax25_cb *, int);
367};
368
369void ax25_linkfail_register(struct ax25_linkfail *lf);
370void ax25_linkfail_release(struct ax25_linkfail *lf);
371int __must_check ax25_listen_register(ax25_address *, struct net_device *);
372void ax25_listen_release(ax25_address *, struct net_device *);
373int(*ax25_protocol_function(unsigned int))(struct sk_buff *, ax25_cb *);
374int ax25_listen_mine(ax25_address *, struct net_device *);
375void ax25_link_failed(ax25_cb *, int);
376int ax25_protocol_is_registered(unsigned int);
377
378/* ax25_in.c */
379int ax25_rx_iframe(ax25_cb *, struct sk_buff *);
380int ax25_kiss_rcv(struct sk_buff *, struct net_device *, struct packet_type *,
381 struct net_device *);
382
383/* ax25_ip.c */
384netdev_tx_t ax25_ip_xmit(struct sk_buff *skb);
385extern const struct header_ops ax25_header_ops;
386
387/* ax25_out.c */
388ax25_cb *ax25_send_frame(struct sk_buff *, int, ax25_address *, ax25_address *,
389 ax25_digi *, struct net_device *);
390void ax25_output(ax25_cb *, int, struct sk_buff *);
391void ax25_kick(ax25_cb *);
392void ax25_transmit_buffer(ax25_cb *, struct sk_buff *, int);
393void ax25_queue_xmit(struct sk_buff *skb, struct net_device *dev);
394int ax25_check_iframes_acked(ax25_cb *, unsigned short);
395
396/* ax25_route.c */
397void ax25_rt_device_down(struct net_device *);
398int ax25_rt_ioctl(unsigned int, void __user *);
399extern const struct file_operations ax25_route_fops;
400ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev);
401int ax25_rt_autobind(ax25_cb *, ax25_address *);
402struct sk_buff *ax25_rt_build_path(struct sk_buff *, ax25_address *,
403 ax25_address *, ax25_digi *);
404void ax25_rt_free(void);
405
406/* ax25_std_in.c */
407int ax25_std_frame_in(ax25_cb *, struct sk_buff *, int);
408
409/* ax25_std_subr.c */
410void ax25_std_nr_error_recovery(ax25_cb *);
411void ax25_std_establish_data_link(ax25_cb *);
412void ax25_std_transmit_enquiry(ax25_cb *);
413void ax25_std_enquiry_response(ax25_cb *);
414void ax25_std_timeout_response(ax25_cb *);
415
416/* ax25_std_timer.c */
417void ax25_std_heartbeat_expiry(ax25_cb *);
418void ax25_std_t1timer_expiry(ax25_cb *);
419void ax25_std_t2timer_expiry(ax25_cb *);
420void ax25_std_t3timer_expiry(ax25_cb *);
421void ax25_std_idletimer_expiry(ax25_cb *);
422
423/* ax25_subr.c */
424void ax25_clear_queues(ax25_cb *);
425void ax25_frames_acked(ax25_cb *, unsigned short);
426void ax25_requeue_frames(ax25_cb *);
427int ax25_validate_nr(ax25_cb *, unsigned short);
428int ax25_decode(ax25_cb *, struct sk_buff *, int *, int *, int *);
429void ax25_send_control(ax25_cb *, int, int, int);
430void ax25_return_dm(struct net_device *, ax25_address *, ax25_address *,
431 ax25_digi *);
432void ax25_calculate_t1(ax25_cb *);
433void ax25_calculate_rtt(ax25_cb *);
434void ax25_disconnect(ax25_cb *, int);
435
436/* ax25_timer.c */
437void ax25_setup_timers(ax25_cb *);
438void ax25_start_heartbeat(ax25_cb *);
439void ax25_start_t1timer(ax25_cb *);
440void ax25_start_t2timer(ax25_cb *);
441void ax25_start_t3timer(ax25_cb *);
442void ax25_start_idletimer(ax25_cb *);
443void ax25_stop_heartbeat(ax25_cb *);
444void ax25_stop_t1timer(ax25_cb *);
445void ax25_stop_t2timer(ax25_cb *);
446void ax25_stop_t3timer(ax25_cb *);
447void ax25_stop_idletimer(ax25_cb *);
448int ax25_t1timer_running(ax25_cb *);
449unsigned long ax25_display_timer(struct timer_list *);
450
451/* ax25_uid.c */
452extern int ax25_uid_policy;
453ax25_uid_assoc *ax25_findbyuid(kuid_t);
454int __must_check ax25_uid_ioctl(int, struct sockaddr_ax25 *);
455extern const struct file_operations ax25_uid_fops;
456void ax25_uid_free(void);
457
458/* sysctl_net_ax25.c */
459#ifdef CONFIG_SYSCTL
460int ax25_register_dev_sysctl(ax25_dev *ax25_dev);
461void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev);
462#else
463static inline int ax25_register_dev_sysctl(ax25_dev *ax25_dev) { return 0; }
464static inline void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev) {}
465#endif /* CONFIG_SYSCTL */
466
467#endif