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Linux/net/irda/ircomm/ircomm_ttp.c

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

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