summaryrefslogtreecommitdiff
path: root/include/net/irda/irlmp.h
blob: 86aefb1fda5e0bba0f24210eb9864b63801fe913 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
/*********************************************************************
 *                
 * Filename:      irlmp.h
 * Version:       0.9
 * Description:   IrDA Link Management Protocol (LMP) layer
 * Status:        Experimental.
 * Author:        Dag Brattli <dagb@cs.uit.no>
 * Created at:    Sun Aug 17 20:54:32 1997
 * Modified at:   Fri Dec 10 13:23:01 1999
 * Modified by:   Dag Brattli <dagb@cs.uit.no>
 * 
 *     Copyright (c) 1998-1999 Dag Brattli <dagb@cs.uit.no>, 
 *     All Rights Reserved.
 *     Copyright (c) 2000-2002 Jean Tourrilhes <jt@hpl.hp.com>
 *     
 *     This program is free software; you can redistribute it and/or 
 *     modify it under the terms of the GNU General Public License as 
 *     published by the Free Software Foundation; either version 2 of 
 *     the License, or (at your option) any later version.
 *
 *     Neither Dag Brattli nor University of Troms� admit liability nor
 *     provide warranty for any of this software. This material is 
 *     provided "AS-IS" and at no charge.
 *
 ********************************************************************/

#ifndef IRLMP_H
#define IRLMP_H

#include <asm/param.h>  /* for HZ */

#include <linux/config.h>
#include <linux/types.h>

#include <net/irda/irda.h>
#include <net/irda/qos.h>
#include <net/irda/irlap.h>		/* LAP_MAX_HEADER, ... */
#include <net/irda/irlmp_event.h>
#include <net/irda/irqueue.h>
#include <net/irda/discovery.h>

/* LSAP-SEL's */
#define LSAP_MASK     0x7f
#define LSAP_IAS      0x00
#define LSAP_ANY      0xff
#define LSAP_MAX      0x6f /* 0x70-0x7f are reserved */
#define LSAP_CONNLESS 0x70 /* Connectionless LSAP, mostly used for Ultra */

#define DEV_ADDR_ANY  0xffffffff

#define LMP_HEADER          2    /* Dest LSAP + Source LSAP */
#define LMP_CONTROL_HEADER  4
#define LMP_PID_HEADER      1    /* Used by Ultra */
#define LMP_MAX_HEADER      (LMP_CONTROL_HEADER+LAP_MAX_HEADER)

#define LM_MAX_CONNECTIONS  10

#define LM_IDLE_TIMEOUT     2*HZ /* 2 seconds for now */

typedef enum {
	S_PNP = 0,
	S_PDA,
	S_COMPUTER,
	S_PRINTER,
	S_MODEM,
	S_FAX,
	S_LAN,
	S_TELEPHONY,
	S_COMM,
	S_OBEX,
	S_ANY,
	S_END,
} SERVICE;

/* For selective discovery */
typedef void (*DISCOVERY_CALLBACK1) (discinfo_t *, DISCOVERY_MODE, void *);
/* For expiry (the same) */
typedef void (*DISCOVERY_CALLBACK2) (discinfo_t *, DISCOVERY_MODE, void *);

typedef struct {
	irda_queue_t queue; /* Must be first */

	__u16_host_order hints; /* Hint bits */
} irlmp_service_t;

typedef struct {
	irda_queue_t queue; /* Must be first */

	__u16_host_order hint_mask;

	DISCOVERY_CALLBACK1 disco_callback;	/* Selective discovery */
	DISCOVERY_CALLBACK2 expir_callback;	/* Selective expiration */
	void *priv;                /* Used to identify client */
} irlmp_client_t;

/*
 *  Information about each logical LSAP connection
 */
struct lsap_cb {
	irda_queue_t queue;      /* Must be first */
	magic_t magic;

	unsigned long connected;	/* set_bit used on this */
	int  persistent;

	__u8 slsap_sel;   /* Source (this) LSAP address */
	__u8 dlsap_sel;   /* Destination LSAP address (if connected) */
#ifdef CONFIG_IRDA_ULTRA
	__u8 pid;         /* Used by connectionless LSAP */
#endif /* CONFIG_IRDA_ULTRA */
	struct sk_buff *conn_skb; /* Store skb here while connecting */

	struct timer_list watchdog_timer;

	IRLMP_STATE     lsap_state;  /* Connection state */
	notify_t        notify;      /* Indication/Confirm entry points */
	struct qos_info qos;         /* QoS for this connection */

	struct lap_cb *lap; /* Pointer to LAP connection structure */
};

/*
 *  Used for caching the last slsap->dlsap->handle mapping
 *
 * We don't need to keep/match the remote address in the cache because
 * we are associated with a specific LAP (which implies it).
 * Jean II
 */
typedef struct {
	int valid;

	__u8 slsap_sel;
	__u8 dlsap_sel;
	struct lsap_cb *lsap;
} CACHE_ENTRY;

/*
 *  Information about each registred IrLAP layer
 */
struct lap_cb {
	irda_queue_t queue; /* Must be first */
	magic_t magic;

	int reason;    /* LAP disconnect reason */

	IRLMP_STATE lap_state;

	struct irlap_cb *irlap;   /* Instance of IrLAP layer */
	hashbin_t *lsaps;         /* LSAP associated with this link */
	struct lsap_cb *flow_next;	/* Next lsap to be polled for Tx */

	__u8  caddr;  /* Connection address */
 	__u32 saddr;  /* Source device address */
 	__u32 daddr;  /* Destination device address */
	
	struct qos_info *qos;  /* LAP QoS for this session */
	struct timer_list idle_timer;
	
#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
	/* The lsap cache was moved from struct irlmp_cb to here because
	 * it must be associated with the specific LAP. Also, this
	 * improves performance. - Jean II */
	CACHE_ENTRY cache;  /* Caching last slsap->dlsap->handle mapping */
#endif
};

/*
 *  Main structure for IrLMP
 */
struct irlmp_cb {
	magic_t magic;

	__u8 conflict_flag;
	
	discovery_t discovery_cmd; /* Discovery command to use by IrLAP */
	discovery_t discovery_rsp; /* Discovery response to use by IrLAP */

	/* Last lsap picked automatically by irlmp_find_free_slsap() */
	int	last_lsap_sel;

	struct timer_list discovery_timer;

 	hashbin_t *links;         /* IrLAP connection table */
	hashbin_t *unconnected_lsaps;
 	hashbin_t *clients;
	hashbin_t *services;

	hashbin_t *cachelog;	/* Current discovery log */

	int running;

	__u16_host_order hints; /* Hint bits */
};

/* Prototype declarations */
int  irlmp_init(void);
void irlmp_cleanup(void);
struct lsap_cb *irlmp_open_lsap(__u8 slsap, notify_t *notify, __u8 pid);
void irlmp_close_lsap( struct lsap_cb *self);

__u16 irlmp_service_to_hint(int service);
void *irlmp_register_service(__u16 hints);
int irlmp_unregister_service(void *handle);
void *irlmp_register_client(__u16 hint_mask, DISCOVERY_CALLBACK1 disco_clb,
			    DISCOVERY_CALLBACK2 expir_clb, void *priv);
int irlmp_unregister_client(void *handle);
int irlmp_update_client(void *handle, __u16 hint_mask, 
			DISCOVERY_CALLBACK1 disco_clb,
			DISCOVERY_CALLBACK2 expir_clb, void *priv);

void irlmp_register_link(struct irlap_cb *, __u32 saddr, notify_t *);
void irlmp_unregister_link(__u32 saddr);

int  irlmp_connect_request(struct lsap_cb *, __u8 dlsap_sel, 
			   __u32 saddr, __u32 daddr,
			   struct qos_info *, struct sk_buff *);
void irlmp_connect_indication(struct lsap_cb *self, struct sk_buff *skb);
int  irlmp_connect_response(struct lsap_cb *, struct sk_buff *);
void irlmp_connect_confirm(struct lsap_cb *, struct sk_buff *);
struct lsap_cb *irlmp_dup(struct lsap_cb *self, void *instance);

void irlmp_disconnect_indication(struct lsap_cb *self, LM_REASON reason, 
				 struct sk_buff *userdata);
int  irlmp_disconnect_request(struct lsap_cb *, struct sk_buff *userdata);

void irlmp_discovery_confirm(hashbin_t *discovery_log, DISCOVERY_MODE mode);
void irlmp_discovery_request(int nslots);
discinfo_t *irlmp_get_discoveries(int *pn, __u16 mask, int nslots);
void irlmp_do_expiry(void);
void irlmp_do_discovery(int nslots);
discovery_t *irlmp_get_discovery_response(void);
void irlmp_discovery_expiry(discinfo_t *expiry, int number);

int  irlmp_data_request(struct lsap_cb *, struct sk_buff *);
void irlmp_data_indication(struct lsap_cb *, struct sk_buff *);

int  irlmp_udata_request(struct lsap_cb *, struct sk_buff *);
void irlmp_udata_indication(struct lsap_cb *, struct sk_buff *);

#ifdef CONFIG_IRDA_ULTRA
int  irlmp_connless_data_request(struct lsap_cb *, struct sk_buff *, __u8);
void irlmp_connless_data_indication(struct lsap_cb *, struct sk_buff *);
#endif /* CONFIG_IRDA_ULTRA */

void irlmp_status_indication(struct lap_cb *, LINK_STATUS link, LOCK_STATUS lock);
void irlmp_flow_indication(struct lap_cb *self, LOCAL_FLOW flow);

LM_REASON irlmp_convert_lap_reason(LAP_REASON);

static inline __u32 irlmp_get_saddr(const struct lsap_cb *self)
{
	return (self && self->lap) ? self->lap->saddr : 0;
}

static inline __u32 irlmp_get_daddr(const struct lsap_cb *self)
{
	return (self && self->lap) ? self->lap->daddr : 0;
}

extern const char *irlmp_reasons[];
extern int sysctl_discovery_timeout;
extern int sysctl_discovery_slots;
extern int sysctl_discovery;
extern int sysctl_lap_keepalive_time;	/* in ms, default is LM_IDLE_TIMEOUT */
extern struct irlmp_cb *irlmp;

/* Check if LAP queue is full.
 * Used by IrTTP for low control, see comments in irlap.h - Jean II */
static inline int irlmp_lap_tx_queue_full(struct lsap_cb *self)
{
	if (self == NULL)
		return 0;
	if (self->lap == NULL)
		return 0;
	if (self->lap->irlap == NULL)
		return 0;

	return(IRLAP_GET_TX_QUEUE_LEN(self->lap->irlap) >= LAP_HIGH_THRESHOLD);
}

/* After doing a irlmp_dup(), this get one of the two socket back into
 * a state where it's waiting incomming connections.
 * Note : this can be used *only* if the socket is not yet connected
 * (i.e. NO irlmp_connect_response() done on this socket).
 * - Jean II */
static inline void irlmp_listen(struct lsap_cb *self)
{
	self->dlsap_sel = LSAP_ANY;
	self->lap = NULL;
	self->lsap_state = LSAP_DISCONNECTED;
	/* Started when we received the LM_CONNECT_INDICATION */
	del_timer(&self->watchdog_timer);
}

#endif