1 /*********************************************************************
2 *
3 * Filename: ircomm_ttp.c
4 * Version: 1.0
5 * Description: Interface between IrCOMM and IrTTP
6 * Status: Stable
7 * Author: Dag Brattli <dagb@cs.uit.no>
8 * Created at: Sun Jun 6 20:48:27 1999
9 * Modified at: Mon Dec 13 11:35:13 1999
10 * Modified by: Dag Brattli <dagb@cs.uit.no>
11 *
12 * Copyright (c) 1999 Dag Brattli, All Rights Reserved.
13 * Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
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 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
28 * MA 02111-1307 USA
29 *
30 ********************************************************************/
31
32 #include <linux/init.h>
33
34 #include <net/irda/irda.h>
35 #include <net/irda/irlmp.h>
36 #include <net/irda/iriap.h>
37 #include <net/irda/irttp.h>
38
39 #include <net/irda/ircomm_event.h>
40 #include <net/irda/ircomm_ttp.h>
41
42 static int ircomm_ttp_data_indication(void *instance, void *sap,
43 struct sk_buff *skb);
44 static void ircomm_ttp_connect_confirm(void *instance, void *sap,
45 struct qos_info *qos,
46 __u32 max_sdu_size,
47 __u8 max_header_size,
48 struct sk_buff *skb);
49 static void ircomm_ttp_connect_indication(void *instance, void *sap,
50 struct qos_info *qos,
51 __u32 max_sdu_size,
52 __u8 max_header_size,
53 struct sk_buff *skb);
54 static void ircomm_ttp_flow_indication(void *instance, void *sap,
55 LOCAL_FLOW cmd);
56 static void ircomm_ttp_disconnect_indication(void *instance, void *sap,
57 LM_REASON reason,
58 struct sk_buff *skb);
59 static int ircomm_ttp_data_request(struct ircomm_cb *self,
60 struct sk_buff *skb,
61 int clen);
62 static int ircomm_ttp_connect_request(struct ircomm_cb *self,
63 struct sk_buff *userdata,
64 struct ircomm_info *info);
65 static int ircomm_ttp_connect_response(struct ircomm_cb *self,
66 struct sk_buff *userdata);
67 static int ircomm_ttp_disconnect_request(struct ircomm_cb *self,
68 struct sk_buff *userdata,
69 struct ircomm_info *info);
70
71 /*
72 * Function ircomm_open_tsap (self)
73 *
74 *
75 *
76 */
ircomm_open_tsap(struct ircomm_cb * self)77 int ircomm_open_tsap(struct ircomm_cb *self)
78 {
79 notify_t notify;
80
81 IRDA_DEBUG(4, "%s()\n", __func__ );
82
83 /* Register callbacks */
84 irda_notify_init(¬ify);
85 notify.data_indication = ircomm_ttp_data_indication;
86 notify.connect_confirm = ircomm_ttp_connect_confirm;
87 notify.connect_indication = ircomm_ttp_connect_indication;
88 notify.flow_indication = ircomm_ttp_flow_indication;
89 notify.disconnect_indication = ircomm_ttp_disconnect_indication;
90 notify.instance = self;
91 strlcpy(notify.name, "IrCOMM", sizeof(notify.name));
92
93 self->tsap = irttp_open_tsap(LSAP_ANY, DEFAULT_INITIAL_CREDIT,
94 ¬ify);
95 if (!self->tsap) {
96 IRDA_DEBUG(0, "%sfailed to allocate tsap\n", __func__ );
97 return -1;
98 }
99 self->slsap_sel = self->tsap->stsap_sel;
100
101 /*
102 * Initialize the call-table for issuing commands
103 */
104 self->issue.data_request = ircomm_ttp_data_request;
105 self->issue.connect_request = ircomm_ttp_connect_request;
106 self->issue.connect_response = ircomm_ttp_connect_response;
107 self->issue.disconnect_request = ircomm_ttp_disconnect_request;
108
109 return 0;
110 }
111
112 /*
113 * Function ircomm_ttp_connect_request (self, userdata)
114 *
115 *
116 *
117 */
ircomm_ttp_connect_request(struct ircomm_cb * self,struct sk_buff * userdata,struct ircomm_info * info)118 static int ircomm_ttp_connect_request(struct ircomm_cb *self,
119 struct sk_buff *userdata,
120 struct ircomm_info *info)
121 {
122 int ret = 0;
123
124 IRDA_DEBUG(4, "%s()\n", __func__ );
125
126 /* Don't forget to refcount it - should be NULL anyway */
127 if(userdata)
128 skb_get(userdata);
129
130 ret = irttp_connect_request(self->tsap, info->dlsap_sel,
131 info->saddr, info->daddr, NULL,
132 TTP_SAR_DISABLE, userdata);
133
134 return ret;
135 }
136
137 /*
138 * Function ircomm_ttp_connect_response (self, skb)
139 *
140 *
141 *
142 */
ircomm_ttp_connect_response(struct ircomm_cb * self,struct sk_buff * userdata)143 static int ircomm_ttp_connect_response(struct ircomm_cb *self,
144 struct sk_buff *userdata)
145 {
146 int ret;
147
148 IRDA_DEBUG(4, "%s()\n", __func__ );
149
150 /* Don't forget to refcount it - should be NULL anyway */
151 if(userdata)
152 skb_get(userdata);
153
154 ret = irttp_connect_response(self->tsap, TTP_SAR_DISABLE, userdata);
155
156 return ret;
157 }
158
159 /*
160 * Function ircomm_ttp_data_request (self, userdata)
161 *
162 * Send IrCOMM data to IrTTP layer. Currently we do not try to combine
163 * control data with pure data, so they will be sent as separate frames.
164 * Should not be a big problem though, since control frames are rare. But
165 * some of them are sent after connection establishment, so this can
166 * increase the latency a bit.
167 */
ircomm_ttp_data_request(struct ircomm_cb * self,struct sk_buff * skb,int clen)168 static int ircomm_ttp_data_request(struct ircomm_cb *self,
169 struct sk_buff *skb,
170 int clen)
171 {
172 int ret;
173
174 IRDA_ASSERT(skb != NULL, return -1;);
175
176 IRDA_DEBUG(2, "%s(), clen=%d\n", __func__ , clen);
177
178 /*
179 * Insert clen field, currently we either send data only, or control
180 * only frames, to make things easier and avoid queueing
181 */
182 IRDA_ASSERT(skb_headroom(skb) >= IRCOMM_HEADER_SIZE, return -1;);
183
184 /* Don't forget to refcount it - see ircomm_tty_do_softint() */
185 skb_get(skb);
186
187 skb_push(skb, IRCOMM_HEADER_SIZE);
188
189 skb->data[0] = clen;
190
191 ret = irttp_data_request(self->tsap, skb);
192 if (ret) {
193 IRDA_ERROR("%s(), failed\n", __func__);
194 /* irttp_data_request already free the packet */
195 }
196
197 return ret;
198 }
199
200 /*
201 * Function ircomm_ttp_data_indication (instance, sap, skb)
202 *
203 * Incoming data
204 *
205 */
ircomm_ttp_data_indication(void * instance,void * sap,struct sk_buff * skb)206 static int ircomm_ttp_data_indication(void *instance, void *sap,
207 struct sk_buff *skb)
208 {
209 struct ircomm_cb *self = (struct ircomm_cb *) instance;
210
211 IRDA_DEBUG(4, "%s()\n", __func__ );
212
213 IRDA_ASSERT(self != NULL, return -1;);
214 IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
215 IRDA_ASSERT(skb != NULL, return -1;);
216
217 ircomm_do_event(self, IRCOMM_TTP_DATA_INDICATION, skb, NULL);
218
219 /* Drop reference count - see ircomm_tty_data_indication(). */
220 dev_kfree_skb(skb);
221
222 return 0;
223 }
224
ircomm_ttp_connect_confirm(void * instance,void * sap,struct qos_info * qos,__u32 max_sdu_size,__u8 max_header_size,struct sk_buff * skb)225 static void ircomm_ttp_connect_confirm(void *instance, void *sap,
226 struct qos_info *qos,
227 __u32 max_sdu_size,
228 __u8 max_header_size,
229 struct sk_buff *skb)
230 {
231 struct ircomm_cb *self = (struct ircomm_cb *) instance;
232 struct ircomm_info info;
233
234 IRDA_DEBUG(4, "%s()\n", __func__ );
235
236 IRDA_ASSERT(self != NULL, return;);
237 IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
238 IRDA_ASSERT(skb != NULL, return;);
239 IRDA_ASSERT(qos != NULL, goto out;);
240
241 if (max_sdu_size != TTP_SAR_DISABLE) {
242 IRDA_ERROR("%s(), SAR not allowed for IrCOMM!\n",
243 __func__);
244 goto out;
245 }
246
247 info.max_data_size = irttp_get_max_seg_size(self->tsap)
248 - IRCOMM_HEADER_SIZE;
249 info.max_header_size = max_header_size + IRCOMM_HEADER_SIZE;
250 info.qos = qos;
251
252 ircomm_do_event(self, IRCOMM_TTP_CONNECT_CONFIRM, skb, &info);
253
254 out:
255 /* Drop reference count - see ircomm_tty_connect_confirm(). */
256 dev_kfree_skb(skb);
257 }
258
259 /*
260 * Function ircomm_ttp_connect_indication (instance, sap, qos, max_sdu_size,
261 * max_header_size, skb)
262 *
263 *
264 *
265 */
ircomm_ttp_connect_indication(void * instance,void * sap,struct qos_info * qos,__u32 max_sdu_size,__u8 max_header_size,struct sk_buff * skb)266 static void ircomm_ttp_connect_indication(void *instance, void *sap,
267 struct qos_info *qos,
268 __u32 max_sdu_size,
269 __u8 max_header_size,
270 struct sk_buff *skb)
271 {
272 struct ircomm_cb *self = (struct ircomm_cb *)instance;
273 struct ircomm_info info;
274
275 IRDA_DEBUG(4, "%s()\n", __func__ );
276
277 IRDA_ASSERT(self != NULL, return;);
278 IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
279 IRDA_ASSERT(skb != NULL, return;);
280 IRDA_ASSERT(qos != NULL, goto out;);
281
282 if (max_sdu_size != TTP_SAR_DISABLE) {
283 IRDA_ERROR("%s(), SAR not allowed for IrCOMM!\n",
284 __func__);
285 goto out;
286 }
287
288 info.max_data_size = irttp_get_max_seg_size(self->tsap)
289 - IRCOMM_HEADER_SIZE;
290 info.max_header_size = max_header_size + IRCOMM_HEADER_SIZE;
291 info.qos = qos;
292
293 ircomm_do_event(self, IRCOMM_TTP_CONNECT_INDICATION, skb, &info);
294
295 out:
296 /* Drop reference count - see ircomm_tty_connect_indication(). */
297 dev_kfree_skb(skb);
298 }
299
300 /*
301 * Function ircomm_ttp_disconnect_request (self, userdata, info)
302 *
303 *
304 *
305 */
ircomm_ttp_disconnect_request(struct ircomm_cb * self,struct sk_buff * userdata,struct ircomm_info * info)306 static int ircomm_ttp_disconnect_request(struct ircomm_cb *self,
307 struct sk_buff *userdata,
308 struct ircomm_info *info)
309 {
310 int ret;
311
312 /* Don't forget to refcount it - should be NULL anyway */
313 if(userdata)
314 skb_get(userdata);
315
316 ret = irttp_disconnect_request(self->tsap, userdata, P_NORMAL);
317
318 return ret;
319 }
320
321 /*
322 * Function ircomm_ttp_disconnect_indication (instance, sap, reason, skb)
323 *
324 *
325 *
326 */
ircomm_ttp_disconnect_indication(void * instance,void * sap,LM_REASON reason,struct sk_buff * skb)327 static void ircomm_ttp_disconnect_indication(void *instance, void *sap,
328 LM_REASON reason,
329 struct sk_buff *skb)
330 {
331 struct ircomm_cb *self = (struct ircomm_cb *) instance;
332 struct ircomm_info info;
333
334 IRDA_DEBUG(2, "%s()\n", __func__ );
335
336 IRDA_ASSERT(self != NULL, return;);
337 IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
338
339 info.reason = reason;
340
341 ircomm_do_event(self, IRCOMM_TTP_DISCONNECT_INDICATION, skb, &info);
342
343 /* Drop reference count - see ircomm_tty_disconnect_indication(). */
344 if(skb)
345 dev_kfree_skb(skb);
346 }
347
348 /*
349 * Function ircomm_ttp_flow_indication (instance, sap, cmd)
350 *
351 * Layer below is telling us to start or stop the flow of data
352 *
353 */
ircomm_ttp_flow_indication(void * instance,void * sap,LOCAL_FLOW cmd)354 static void ircomm_ttp_flow_indication(void *instance, void *sap,
355 LOCAL_FLOW cmd)
356 {
357 struct ircomm_cb *self = (struct ircomm_cb *) instance;
358
359 IRDA_DEBUG(4, "%s()\n", __func__ );
360
361 IRDA_ASSERT(self != NULL, return;);
362 IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
363
364 if (self->notify.flow_indication)
365 self->notify.flow_indication(self->notify.instance, self, cmd);
366 }
367
368
369