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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/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_IP 0xCC
30#define AX25_P_ARP 0xCD
31#define AX25_P_TEXT 0xF0
32#define AX25_P_NETROM 0xCF
33#define AX25_P_SEGMENT 0x08
34
35/* AX.25 Segment control values */
36#define AX25_SEG_REM 0x7F
37#define AX25_SEG_FIRST 0x80
38
39#define AX25_CBIT 0x80 /* Command/Response bit */
40#define AX25_EBIT 0x01 /* HDLC Address Extension bit */
41#define AX25_HBIT 0x80 /* Has been repeated bit */
42
43#define AX25_SSSID_SPARE 0x60 /* Unused bits in SSID for standard AX.25 */
44#define AX25_ESSID_SPARE 0x20 /* Unused bits in SSID for extended AX.25 */
45#define AX25_DAMA_FLAG 0x20 /* Well, it is *NOT* unused! (dl1bke 951121 */
46
47#define AX25_COND_ACK_PENDING 0x01
48#define AX25_COND_REJECT 0x02
49#define AX25_COND_PEER_RX_BUSY 0x04
50#define AX25_COND_OWN_RX_BUSY 0x08
51#define AX25_COND_DAMA_MODE 0x10
52
53#ifndef _LINUX_NETDEVICE_H
54#include <linux/netdevice.h>
55#endif
56
57/* Upper sub-layer (LAPB) definitions */
58
59/* Control field templates */
60#define AX25_I 0x00 /* Information frames */
61#define AX25_S 0x01 /* Supervisory frames */
62#define AX25_RR 0x01 /* Receiver ready */
63#define AX25_RNR 0x05 /* Receiver not ready */
64#define AX25_REJ 0x09 /* Reject */
65#define AX25_U 0x03 /* Unnumbered frames */
66#define AX25_SABM 0x2f /* Set Asynchronous Balanced Mode */
67#define AX25_SABME 0x6f /* Set Asynchronous Balanced Mode Extended */
68#define AX25_DISC 0x43 /* Disconnect */
69#define AX25_DM 0x0f /* Disconnected mode */
70#define AX25_UA 0x63 /* Unnumbered acknowledge */
71#define AX25_FRMR 0x87 /* Frame reject */
72#define AX25_UI 0x03 /* Unnumbered information */
73#define AX25_XID 0xaf /* Exchange information */
74#define AX25_TEST 0xe3 /* Test */
75
76#define AX25_PF 0x10 /* Poll/final bit for standard AX.25 */
77#define AX25_EPF 0x01 /* Poll/final bit for extended AX.25 */
78
79#define AX25_ILLEGAL 0x100 /* Impossible to be a real frame type */
80
81#define AX25_POLLOFF 0
82#define AX25_POLLON 1
83
84/* AX25 L2 C-bit */
85#define AX25_COMMAND 1
86#define AX25_RESPONSE 2
87
88/* Define Link State constants. */
89
90enum {
91 AX25_STATE_0,
92 AX25_STATE_1,
93 AX25_STATE_2,
94 AX25_STATE_3,
95 AX25_STATE_4
96};
97
98#define AX25_MODULUS 8 /* Standard AX.25 modulus */
99#define AX25_EMODULUS 128 /* Extended AX.25 modulus */
100
101enum {
102 AX25_PROTO_STD_SIMPLEX,
103 AX25_PROTO_STD_DUPLEX,
104 AX25_PROTO_DAMA_SLAVE,
105 AX25_PROTO_DAMA_MASTER
106};
107
108enum {
109 AX25_VALUES_IPDEFMODE, /* 0=DG 1=VC */
110 AX25_VALUES_AXDEFMODE, /* 0=Normal 1=Extended Seq Nos */
111 AX25_VALUES_BACKOFF, /* 0=None 1=Linear 2=Exponential */
112 AX25_VALUES_CONMODE, /* Allow connected modes - 0=No 1=no "PID text" 2=all PIDs */
113 AX25_VALUES_WINDOW, /* Default window size for standard AX.25 */
114 AX25_VALUES_EWINDOW, /* Default window size for extended AX.25 */
115 AX25_VALUES_T1, /* Default T1 timeout value */
116 AX25_VALUES_T2, /* Default T2 timeout value */
117 AX25_VALUES_T3, /* Default T3 timeout value */
118 AX25_VALUES_IDLE, /* Connected mode idle timer */
119 AX25_VALUES_N2, /* Default N2 value */
120 AX25_VALUES_PACLEN, /* AX.25 MTU */
121 AX25_VALUES_PROTOCOL, /* Std AX.25, DAMA Slave, DAMA Master */
122 AX25_VALUES_DS_TIMEOUT, /* DAMA Slave timeout */
123 AX25_MAX_VALUES /* THIS MUST REMAIN THE LAST ENTRY OF THIS LIST */
124};
125
126#define AX25_DEF_IPDEFMODE 0 /* Datagram */
127#define AX25_DEF_AXDEFMODE 0 /* Normal */
128#define AX25_DEF_BACKOFF 1 /* Linear backoff */
129#define AX25_DEF_CONMODE 2 /* Connected mode allowed */
130#define AX25_DEF_WINDOW 2 /* Window=2 */
131#define AX25_DEF_EWINDOW 32 /* Module-128 Window=32 */
132#define AX25_DEF_T1 (10 * HZ) /* T1=10s */
133#define AX25_DEF_T2 (3 * HZ) /* T2=3s */
134#define AX25_DEF_T3 (300 * HZ) /* T3=300s */
135#define AX25_DEF_N2 10 /* N2=10 */
136#define AX25_DEF_IDLE (0 * 60 * HZ) /* Idle=None */
137#define AX25_DEF_PACLEN 256 /* Paclen=256 */
138#define AX25_DEF_PROTOCOL AX25_PROTO_STD_SIMPLEX /* Standard AX.25 */
139#define AX25_DEF_DS_TIMEOUT (3 * 60 * HZ) /* DAMA timeout 3 minutes */
140
141typedef struct ax25_uid_assoc {
142 struct hlist_node uid_node;
143 atomic_t refcount;
144 uid_t uid;
145 ax25_address call;
146} ax25_uid_assoc;
147
148#define ax25_uid_for_each(__ax25, node, list) \
149 hlist_for_each_entry(__ax25, node, list, uid_node)
150
151#define ax25_uid_hold(ax25) \
152 atomic_inc(&((ax25)->refcount))
153
154static inline void ax25_uid_put(ax25_uid_assoc *assoc)
155{
156 if (atomic_dec_and_test(&assoc->refcount)) {
157 kfree(assoc);
158 }
159}
160
161typedef struct {
162 ax25_address calls[AX25_MAX_DIGIS];
163 unsigned char repeated[AX25_MAX_DIGIS];
164 unsigned char ndigi;
165 char lastrepeat;
166} ax25_digi;
167
168typedef struct ax25_route {
169 struct ax25_route *next;
170 atomic_t ref;
171 ax25_address callsign;
172 struct net_device *dev;
173 ax25_digi *digipeat;
174 char ip_mode;
175 struct timer_list timer;
176} ax25_route;
177
178typedef struct {
179 char slave; /* slave_mode? */
180 struct timer_list slave_timer; /* timeout timer */
181 unsigned short slave_timeout; /* when? */
182} ax25_dama_info;
183
184struct ctl_table;
185
186typedef struct ax25_dev {
187 struct ax25_dev *next;
188 struct net_device *dev;
189 struct net_device *forward;
190 struct ctl_table *systable;
191 int values[AX25_MAX_VALUES];
192#if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER)
193 ax25_dama_info dama;
194#endif
195} ax25_dev;
196
197typedef struct ax25_cb {
198 struct hlist_node ax25_node;
199 ax25_address source_addr, dest_addr;
200 ax25_digi *digipeat;
201 ax25_dev *ax25_dev;
202 unsigned char iamdigi;
203 unsigned char state, modulus, pidincl;
204 unsigned short vs, vr, va;
205 unsigned char condition, backoff;
206 unsigned char n2, n2count;
207 struct timer_list t1timer, t2timer, t3timer, idletimer;
208 unsigned long t1, t2, t3, idle, rtt;
209 unsigned short paclen, fragno, fraglen;
210 struct sk_buff_head write_queue;
211 struct sk_buff_head reseq_queue;
212 struct sk_buff_head ack_queue;
213 struct sk_buff_head frag_queue;
214 unsigned char window;
215 struct timer_list timer, dtimer;
216 struct sock *sk; /* Backlink to socket */
217 atomic_t refcount;
218} ax25_cb;
219
220#define ax25_sk(__sk) ((ax25_cb *)(__sk)->sk_protinfo)
221
222#define ax25_for_each(__ax25, node, list) \
223 hlist_for_each_entry(__ax25, node, list, ax25_node)
224
225#define ax25_cb_hold(__ax25) \
226 atomic_inc(&((__ax25)->refcount))
227
228static __inline__ void ax25_cb_put(ax25_cb *ax25)
229{
230 if (atomic_dec_and_test(&ax25->refcount)) {
231 if (ax25->digipeat)
232 kfree(ax25->digipeat);
233 kfree(ax25);
234 }
235}
236
237static inline __be16 ax25_type_trans(struct sk_buff *skb, struct net_device *dev)
238{
239 skb->dev = dev;
240 skb->pkt_type = PACKET_HOST;
241 skb->mac.raw = skb->data;
242 return htons(ETH_P_AX25);
243}
244
245/* af_ax25.c */
246extern struct hlist_head ax25_list;
247extern spinlock_t ax25_list_lock;
248extern void ax25_cb_add(ax25_cb *);
249struct sock *ax25_find_listener(ax25_address *, int, struct net_device *, int);
250struct sock *ax25_get_socket(ax25_address *, ax25_address *, int);
251extern ax25_cb *ax25_find_cb(ax25_address *, ax25_address *, ax25_digi *, struct net_device *);
252extern void ax25_send_to_raw(ax25_address *, struct sk_buff *, int);
253extern void ax25_destroy_socket(ax25_cb *);
254extern ax25_cb *ax25_create_cb(void);
255extern void ax25_fillin_cb(ax25_cb *, ax25_dev *);
256extern struct sock *ax25_make_new(struct sock *, struct ax25_dev *);
257
258/* ax25_addr.c */
259extern ax25_address null_ax25_address;
260extern char *ax2asc(char *buf, ax25_address *);
261extern void asc2ax(ax25_address *addr, char *callsign);
262extern int ax25cmp(ax25_address *, ax25_address *);
263extern int ax25digicmp(ax25_digi *, ax25_digi *);
264extern unsigned char *ax25_addr_parse(unsigned char *, int, ax25_address *, ax25_address *, ax25_digi *, int *, int *);
265extern int ax25_addr_build(unsigned char *, ax25_address *, ax25_address *, ax25_digi *, int, int);
266extern int ax25_addr_size(ax25_digi *);
267extern void ax25_digi_invert(ax25_digi *, ax25_digi *);
268
269/* ax25_dev.c */
270extern ax25_dev *ax25_dev_list;
271extern spinlock_t ax25_dev_lock;
272
273static inline ax25_dev *ax25_dev_ax25dev(struct net_device *dev)
274{
275 return dev->ax25_ptr;
276}
277
278extern ax25_dev *ax25_addr_ax25dev(ax25_address *);
279extern void ax25_dev_device_up(struct net_device *);
280extern void ax25_dev_device_down(struct net_device *);
281extern int ax25_fwd_ioctl(unsigned int, struct ax25_fwd_struct *);
282extern struct net_device *ax25_fwd_dev(struct net_device *);
283extern void ax25_dev_free(void);
284
285/* ax25_ds_in.c */
286extern int ax25_ds_frame_in(ax25_cb *, struct sk_buff *, int);
287
288/* ax25_ds_subr.c */
289extern void ax25_ds_nr_error_recovery(ax25_cb *);
290extern void ax25_ds_enquiry_response(ax25_cb *);
291extern void ax25_ds_establish_data_link(ax25_cb *);
292extern void ax25_dev_dama_off(ax25_dev *);
293extern void ax25_dama_on(ax25_cb *);
294extern void ax25_dama_off(ax25_cb *);
295
296/* ax25_ds_timer.c */
297extern void ax25_ds_set_timer(ax25_dev *);
298extern void ax25_ds_del_timer(ax25_dev *);
299extern void ax25_ds_timer(ax25_cb *);
300extern void ax25_ds_t1_timeout(ax25_cb *);
301extern void ax25_ds_heartbeat_expiry(ax25_cb *);
302extern void ax25_ds_t3timer_expiry(ax25_cb *);
303extern void ax25_ds_idletimer_expiry(ax25_cb *);
304
305/* ax25_iface.c */
306extern int ax25_protocol_register(unsigned int, int (*)(struct sk_buff *, ax25_cb *));
307extern void ax25_protocol_release(unsigned int);
308extern int ax25_linkfail_register(void (*)(ax25_cb *, int));
309extern void ax25_linkfail_release(void (*)(ax25_cb *, int));
310extern int ax25_listen_register(ax25_address *, struct net_device *);
311extern void ax25_listen_release(ax25_address *, struct net_device *);
312extern int (*ax25_protocol_function(unsigned int))(struct sk_buff *, ax25_cb *);
313extern int ax25_listen_mine(ax25_address *, struct net_device *);
314extern void ax25_link_failed(ax25_cb *, int);
315extern int ax25_protocol_is_registered(unsigned int);
316
317/* ax25_in.c */
318extern int ax25_rx_iframe(ax25_cb *, struct sk_buff *);
319extern int ax25_kiss_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
320
321/* ax25_ip.c */
322extern int ax25_encapsulate(struct sk_buff *, struct net_device *, unsigned short, void *, void *, unsigned int);
323extern int ax25_rebuild_header(struct sk_buff *);
324
325/* ax25_out.c */
326extern ax25_cb *ax25_send_frame(struct sk_buff *, int, ax25_address *, ax25_address *, ax25_digi *, struct net_device *);
327extern void ax25_output(ax25_cb *, int, struct sk_buff *);
328extern void ax25_kick(ax25_cb *);
329extern void ax25_transmit_buffer(ax25_cb *, struct sk_buff *, int);
330extern void ax25_queue_xmit(struct sk_buff *skb, struct net_device *dev);
331extern int ax25_check_iframes_acked(ax25_cb *, unsigned short);
332
333/* ax25_route.c */
334extern void ax25_rt_device_down(struct net_device *);
335extern int ax25_rt_ioctl(unsigned int, void __user *);
336extern struct file_operations ax25_route_fops;
337extern int ax25_rt_autobind(ax25_cb *, ax25_address *);
338extern ax25_route *ax25_rt_find_route(ax25_route *, ax25_address *,
339 struct net_device *);
340extern struct sk_buff *ax25_rt_build_path(struct sk_buff *, ax25_address *, ax25_address *, ax25_digi *);
341extern void ax25_rt_free(void);
342
343static inline void ax25_put_route(ax25_route *ax25_rt)
344{
345 atomic_dec(&ax25_rt->ref);
346}
347
348/* ax25_std_in.c */
349extern int ax25_std_frame_in(ax25_cb *, struct sk_buff *, int);
350
351/* ax25_std_subr.c */
352extern void ax25_std_nr_error_recovery(ax25_cb *);
353extern void ax25_std_establish_data_link(ax25_cb *);
354extern void ax25_std_transmit_enquiry(ax25_cb *);
355extern void ax25_std_enquiry_response(ax25_cb *);
356extern void ax25_std_timeout_response(ax25_cb *);
357
358/* ax25_std_timer.c */
359extern void ax25_std_heartbeat_expiry(ax25_cb *);
360extern void ax25_std_t1timer_expiry(ax25_cb *);
361extern void ax25_std_t2timer_expiry(ax25_cb *);
362extern void ax25_std_t3timer_expiry(ax25_cb *);
363extern void ax25_std_idletimer_expiry(ax25_cb *);
364
365/* ax25_subr.c */
366extern void ax25_clear_queues(ax25_cb *);
367extern void ax25_frames_acked(ax25_cb *, unsigned short);
368extern void ax25_requeue_frames(ax25_cb *);
369extern int ax25_validate_nr(ax25_cb *, unsigned short);
370extern int ax25_decode(ax25_cb *, struct sk_buff *, int *, int *, int *);
371extern void ax25_send_control(ax25_cb *, int, int, int);
372extern void ax25_return_dm(struct net_device *, ax25_address *, ax25_address *, ax25_digi *);
373extern void ax25_calculate_t1(ax25_cb *);
374extern void ax25_calculate_rtt(ax25_cb *);
375extern void ax25_disconnect(ax25_cb *, int);
376
377/* ax25_timer.c */
378extern void ax25_start_heartbeat(ax25_cb *);
379extern void ax25_start_t1timer(ax25_cb *);
380extern void ax25_start_t2timer(ax25_cb *);
381extern void ax25_start_t3timer(ax25_cb *);
382extern void ax25_start_idletimer(ax25_cb *);
383extern void ax25_stop_heartbeat(ax25_cb *);
384extern void ax25_stop_t1timer(ax25_cb *);
385extern void ax25_stop_t2timer(ax25_cb *);
386extern void ax25_stop_t3timer(ax25_cb *);
387extern void ax25_stop_idletimer(ax25_cb *);
388extern int ax25_t1timer_running(ax25_cb *);
389extern unsigned long ax25_display_timer(struct timer_list *);
390
391/* ax25_uid.c */
392extern int ax25_uid_policy;
393extern ax25_uid_assoc *ax25_findbyuid(uid_t);
394extern int ax25_uid_ioctl(int, struct sockaddr_ax25 *);
395extern struct file_operations ax25_uid_fops;
396extern void ax25_uid_free(void);
397
398/* sysctl_net_ax25.c */
399#ifdef CONFIG_SYSCTL
400extern void ax25_register_sysctl(void);
401extern void ax25_unregister_sysctl(void);
402#else
403static inline void ax25_register_sysctl(void) {};
404static inline void ax25_unregister_sysctl(void) {};
405#endif /* CONFIG_SYSCTL */
406
407#endif