1 /*********************************************************************
2 *
3 * Filename: irlap.h
4 * Version: 0.8
5 * Description: An IrDA LAP driver for Linux
6 * Status: Experimental.
7 * Author: Dag Brattli <dagb@cs.uit.no>
8 * Created at: Mon Aug 4 20:40:53 1997
9 * Modified at: Fri Dec 10 13:21:17 1999
10 * Modified by: Dag Brattli <dagb@cs.uit.no>
11 *
12 * Copyright (c) 1998-1999 Dag Brattli <dagb@cs.uit.no>,
13 * All Rights Reserved.
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License as
17 * published by the Free Software Foundation; either version 2 of
18 * the License, or (at your option) any later version.
19 *
20 * Neither Dag Brattli nor University of Tromsų admit liability nor
21 * provide warranty for any of this software. This material is
22 * provided "AS-IS" and at no charge.
23 *
24 ********************************************************************/
25
26 #ifndef IRLAP_H
27 #define IRLAP_H
28
29 #include <linux/config.h>
30 #include <linux/types.h>
31 #include <linux/skbuff.h>
32 #include <linux/netdevice.h>
33 #include <linux/ppp_defs.h>
34 #include <linux/ppp-comp.h>
35 #include <linux/timer.h>
36
37 #include <net/irda/irlap_event.h>
38
39 #define CONFIG_IRDA_DYNAMIC_WINDOW 1
40
41 #define LAP_RELIABLE 1
42 #define LAP_UNRELIABLE 0
43
44 #define LAP_ADDR_HEADER 1 /* IrLAP Address Header */
45 #define LAP_CTRL_HEADER 1 /* IrLAP Control Header */
46 #define LAP_COMP_HEADER 1 /* IrLAP Compression Header */
47
48 #ifdef CONFIG_IRDA_COMPRESSION
49 # define LAP_MAX_HEADER (LAP_ADDR_HEADER + LAP_CTRL_HEADER + LAP_COMP_HEADER)
50 # define IRDA_COMPRESSED 1
51 # define IRDA_NORMAL 0
52 #else
53 #define LAP_MAX_HEADER (LAP_ADDR_HEADER + LAP_CTRL_HEADER)
54 #endif
55
56 #define BROADCAST 0xffffffff /* Broadcast device address */
57 #define CBROADCAST 0xfe /* Connection broadcast address */
58 #define XID_FORMAT 0x01 /* Discovery XID format */
59
60 #define LAP_WINDOW_SIZE 8
61 #define LAP_MAX_QUEUE 10
62
63 #define NR_EXPECTED 1
64 #define NR_UNEXPECTED 0
65 #define NR_INVALID -1
66
67 #define NS_EXPECTED 1
68 #define NS_UNEXPECTED 0
69 #define NS_INVALID -1
70
71 #ifdef CONFIG_IRDA_COMPRESSION
72
73 /*
74 * Just some shortcuts (may give you strange compiler errors if you change
75 * them :-)
76 */
77 #define irda_compress (*self->compessor.cp->compress)
78 #define irda_comp_free (*self->compressor.cp->comp_free)
79 #define irda_decompress (*self->decompressor.cp->decompress)
80 #define irda_decomp_free (*self->decompressor.cp->decomp_free)
81 #define irda_incomp (*self->decompressor.cp->incomp)
82
83 struct irda_compressor {
84 irda_queue_t q;
85
86 struct compressor *cp;
87 void *state; /* Not used by IrDA */
88 };
89 #endif
90
91 /* Main structure of IrLAP */
92 struct irlap_cb {
93 irda_queue_t q; /* Must be first */
94 magic_t magic;
95
96 struct net_device *netdev;
97
98 /* Connection state */
99 volatile IRLAP_STATE state; /* Current state */
100
101 /* Timers used by IrLAP */
102 struct timer_list query_timer;
103 struct timer_list slot_timer;
104 struct timer_list discovery_timer;
105 struct timer_list final_timer;
106 struct timer_list poll_timer;
107 struct timer_list wd_timer;
108 struct timer_list backoff_timer;
109
110 /* Media busy stuff */
111 struct timer_list media_busy_timer;
112 int media_busy;
113
114 /* Timeouts which will be different with different turn time */
115 int slot_timeout;
116 int poll_timeout;
117 int final_timeout;
118 int wd_timeout;
119
120 struct sk_buff_head txq; /* Frames to be transmitted */
121 struct sk_buff_head txq_ultra;
122
123 __u8 caddr; /* Connection address */
124 __u32 saddr; /* Source device address */
125 __u32 daddr; /* Destination device address */
126
127 int retry_count; /* Times tried to establish connection */
128 int add_wait; /* True if we are waiting for frame */
129
130 __u8 connect_pending;
131 __u8 disconnect_pending;
132
133 /* To send a faster RR if tx queue empty */
134 #ifdef CONFIG_IRDA_FAST_RR
135 int fast_RR_timeout;
136 int fast_RR;
137 #endif /* CONFIG_IRDA_FAST_RR */
138
139 int N1; /* N1 * F-timer = Negitiated link disconnect warning threshold */
140 int N2; /* N2 * F-timer = Negitiated link disconnect time */
141 int N3; /* Connection retry count */
142
143 int local_busy;
144 int remote_busy;
145 int xmitflag;
146
147 __u8 vs; /* Next frame to be sent */
148 __u8 vr; /* Next frame to be received */
149 __u8 va; /* Last frame acked */
150 int window; /* Nr of I-frames allowed to send */
151 int window_size; /* Current negotiated window size */
152
153 #ifdef CONFIG_IRDA_DYNAMIC_WINDOW
154 __u32 line_capacity; /* Number of bytes allowed to send */
155 __u32 bytes_left; /* Number of bytes still allowed to transmit */
156 #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
157
158 struct sk_buff_head wx_list;
159
160 __u8 ack_required;
161
162 /* XID parameters */
163 __u8 S; /* Number of slots */
164 __u8 slot; /* Random chosen slot */
165 __u8 s; /* Current slot */
166 int frame_sent; /* Have we sent reply? */
167
168 hashbin_t *discovery_log;
169 discovery_t *discovery_cmd;
170
171 __u32 speed;
172
173 struct qos_info qos_tx; /* QoS requested by peer */
174 struct qos_info qos_rx; /* QoS requested by self */
175 struct qos_info *qos_dev; /* QoS supported by device */
176
177 notify_t notify; /* Callbacks to IrLMP */
178
179 int mtt_required; /* Minumum turnaround time required */
180 int xbofs_delay; /* Nr of XBOF's used to MTT */
181 int bofs_count; /* Negotiated extra BOFs */
182
183 #ifdef CONFIG_IRDA_COMPRESSION
184 struct irda_compressor compressor;
185 struct irda_compressor decompressor;
186 #endif /* CONFIG_IRDA_COMPRESSION */
187 };
188
189 extern hashbin_t *irlap;
190
191 /*
192 * Function prototypes
193 */
194 int irlap_init(void);
195 void irlap_cleanup(void);
196
197 struct irlap_cb *irlap_open(struct net_device *dev, struct qos_info *qos);
198 void irlap_close(struct irlap_cb *self);
199
200 void irlap_connect_request(struct irlap_cb *self, __u32 daddr,
201 struct qos_info *qos, int sniff);
202 void irlap_connect_response(struct irlap_cb *self, struct sk_buff *skb);
203 void irlap_connect_indication(struct irlap_cb *self, struct sk_buff *skb);
204 void irlap_connect_confirm(struct irlap_cb *, struct sk_buff *skb);
205
206 void irlap_data_indication(struct irlap_cb *, struct sk_buff *, int unreliable);
207 void irlap_data_request(struct irlap_cb *, struct sk_buff *, int unreliable);
208
209 #ifdef CONFIG_IRDA_ULTRA
210 void irlap_unitdata_request(struct irlap_cb *, struct sk_buff *);
211 void irlap_unitdata_indication(struct irlap_cb *, struct sk_buff *);
212 #endif /* CONFIG_IRDA_ULTRA */
213
214 void irlap_disconnect_request(struct irlap_cb *);
215 void irlap_disconnect_indication(struct irlap_cb *, LAP_REASON reason);
216
217 void irlap_status_indication(struct irlap_cb *, int quality_of_link);
218
219 void irlap_test_request(__u8 *info, int len);
220
221 void irlap_discovery_request(struct irlap_cb *, discovery_t *discovery);
222 void irlap_discovery_confirm(struct irlap_cb *, hashbin_t *discovery_log);
223 void irlap_discovery_indication(struct irlap_cb *, discovery_t *discovery);
224
225 void irlap_reset_indication(struct irlap_cb *self);
226 void irlap_reset_confirm(void);
227
228 void irlap_update_nr_received(struct irlap_cb *, int nr);
229 int irlap_validate_nr_received(struct irlap_cb *, int nr);
230 int irlap_validate_ns_received(struct irlap_cb *, int ns);
231
232 int irlap_generate_rand_time_slot(int S, int s);
233 void irlap_initiate_connection_state(struct irlap_cb *);
234 void irlap_flush_all_queues(struct irlap_cb *);
235 void irlap_change_speed(struct irlap_cb *self, __u32 speed, int now);
236 void irlap_wait_min_turn_around(struct irlap_cb *, struct qos_info *);
237
238 void irlap_init_qos_capabilities(struct irlap_cb *, struct qos_info *);
239 void irlap_apply_default_connection_parameters(struct irlap_cb *self);
240 void irlap_apply_connection_parameters(struct irlap_cb *self);
241 void irlap_set_local_busy(struct irlap_cb *self, int status);
242
243 #define IRLAP_GET_HEADER_SIZE(self) 2 /* Will be different when we get VFIR */
244 #define IRLAP_GET_TX_QUEUE_LEN(self) skb_queue_len(&self->txq)
245
246 #endif
247
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