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Linux/net/irda/ircomm/ircomm_lmp.c

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  1 /*********************************************************************
  2  *
  3  * Filename:      ircomm_lmp.c
  4  * Version:       1.0
  5  * Description:   Interface between IrCOMM and IrLMP
  6  * Status:        Stable
  7  * Author:        Dag Brattli <dagb@cs.uit.no>
  8  * Created at:    Sun Jun  6 20:48:27 1999
  9  * Modified at:   Sun Dec 12 13:44:17 1999
 10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
 11  * Sources:       Previous IrLPT work by Thomas Davis
 12  *
 13  *     Copyright (c) 1999 Dag Brattli, All Rights Reserved.
 14  *     Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
 15  *
 16  *     This program is free software; you can redistribute it and/or
 17  *     modify it under the terms of the GNU General Public License as
 18  *     published by the Free Software Foundation; either version 2 of
 19  *     the License, or (at your option) any later version.
 20  *
 21  *     This program is distributed in the hope that it will be useful,
 22  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 23  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 24  *     GNU General Public License for more details.
 25  *
 26  *     You should have received a copy of the GNU General Public License
 27  *     along with this program; if not, see <http://www.gnu.org/licenses/>.
 28  *
 29  ********************************************************************/
 30 
 31 #include <linux/init.h>
 32 #include <linux/gfp.h>
 33 
 34 #include <net/irda/irda.h>
 35 #include <net/irda/irlmp.h>
 36 #include <net/irda/iriap.h>
 37 #include <net/irda/irda_device.h>       /* struct irda_skb_cb */
 38 
 39 #include <net/irda/ircomm_event.h>
 40 #include <net/irda/ircomm_lmp.h>
 41 
 42 
 43 /*
 44  * Function ircomm_lmp_connect_request (self, userdata)
 45  *
 46  *
 47  *
 48  */
 49 static int ircomm_lmp_connect_request(struct ircomm_cb *self,
 50                                       struct sk_buff *userdata,
 51                                       struct ircomm_info *info)
 52 {
 53         int ret = 0;
 54 
 55         /* Don't forget to refcount it - should be NULL anyway */
 56         if(userdata)
 57                 skb_get(userdata);
 58 
 59         ret = irlmp_connect_request(self->lsap, info->dlsap_sel,
 60                                     info->saddr, info->daddr, NULL, userdata);
 61         return ret;
 62 }
 63 
 64 /*
 65  * Function ircomm_lmp_connect_response (self, skb)
 66  *
 67  *
 68  *
 69  */
 70 static int ircomm_lmp_connect_response(struct ircomm_cb *self,
 71                                        struct sk_buff *userdata)
 72 {
 73         struct sk_buff *tx_skb;
 74 
 75         /* Any userdata supplied? */
 76         if (userdata == NULL) {
 77                 tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
 78                 if (!tx_skb)
 79                         return -ENOMEM;
 80 
 81                 /* Reserve space for MUX and LAP header */
 82                 skb_reserve(tx_skb, LMP_MAX_HEADER);
 83         } else {
 84                 /*
 85                  *  Check that the client has reserved enough space for
 86                  *  headers
 87                  */
 88                 IRDA_ASSERT(skb_headroom(userdata) >= LMP_MAX_HEADER,
 89                             return -1;);
 90 
 91                 /* Don't forget to refcount it - should be NULL anyway */
 92                 skb_get(userdata);
 93                 tx_skb = userdata;
 94         }
 95 
 96         return irlmp_connect_response(self->lsap, tx_skb);
 97 }
 98 
 99 static int ircomm_lmp_disconnect_request(struct ircomm_cb *self,
100                                          struct sk_buff *userdata,
101                                          struct ircomm_info *info)
102 {
103         struct sk_buff *tx_skb;
104         int ret;
105 
106         if (!userdata) {
107                 tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
108                 if (!tx_skb)
109                         return -ENOMEM;
110 
111                 /*  Reserve space for MUX and LAP header */
112                 skb_reserve(tx_skb, LMP_MAX_HEADER);
113                 userdata = tx_skb;
114         } else {
115                 /* Don't forget to refcount it - should be NULL anyway */
116                 skb_get(userdata);
117         }
118 
119         ret = irlmp_disconnect_request(self->lsap, userdata);
120 
121         return ret;
122 }
123 
124 /*
125  * Function ircomm_lmp_flow_control (skb)
126  *
127  *    This function is called when a data frame we have sent to IrLAP has
128  *    been deallocated. We do this to make sure we don't flood IrLAP with
129  *    frames, since we are not using the IrTTP flow control mechanism
130  */
131 static void ircomm_lmp_flow_control(struct sk_buff *skb)
132 {
133         struct irda_skb_cb *cb;
134         struct ircomm_cb *self;
135         int line;
136 
137         IRDA_ASSERT(skb != NULL, return;);
138 
139         cb = (struct irda_skb_cb *) skb->cb;
140 
141         line = cb->line;
142 
143         self = (struct ircomm_cb *) hashbin_lock_find(ircomm, line, NULL);
144         if (!self) {
145                 pr_debug("%s(), didn't find myself\n", __func__);
146                 return;
147         }
148 
149         IRDA_ASSERT(self != NULL, return;);
150         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
151 
152         self->pkt_count--;
153 
154         if ((self->pkt_count < 2) && (self->flow_status == FLOW_STOP)) {
155                 pr_debug("%s(), asking TTY to start again!\n", __func__);
156                 self->flow_status = FLOW_START;
157                 if (self->notify.flow_indication)
158                         self->notify.flow_indication(self->notify.instance,
159                                                      self, FLOW_START);
160         }
161 }
162 
163 /*
164  * Function ircomm_lmp_data_request (self, userdata)
165  *
166  *    Send data frame to peer device
167  *
168  */
169 static int ircomm_lmp_data_request(struct ircomm_cb *self,
170                                    struct sk_buff *skb,
171                                    int not_used)
172 {
173         struct irda_skb_cb *cb;
174         int ret;
175 
176         IRDA_ASSERT(skb != NULL, return -1;);
177 
178         cb = (struct irda_skb_cb *) skb->cb;
179 
180         cb->line = self->line;
181 
182         pr_debug("%s(), sending frame\n", __func__);
183 
184         /* Don't forget to refcount it - see ircomm_tty_do_softint() */
185         skb_get(skb);
186 
187         skb_orphan(skb);
188         skb->destructor = ircomm_lmp_flow_control;
189 
190         if ((self->pkt_count++ > 7) && (self->flow_status == FLOW_START)) {
191                 pr_debug("%s(), asking TTY to slow down!\n", __func__);
192                 self->flow_status = FLOW_STOP;
193                 if (self->notify.flow_indication)
194                         self->notify.flow_indication(self->notify.instance,
195                                                      self, FLOW_STOP);
196         }
197         ret = irlmp_data_request(self->lsap, skb);
198         if (ret) {
199                 net_err_ratelimited("%s(), failed\n", __func__);
200                 /* irlmp_data_request already free the packet */
201         }
202 
203         return ret;
204 }
205 
206 /*
207  * Function ircomm_lmp_data_indication (instance, sap, skb)
208  *
209  *    Incoming data which we must deliver to the state machine, to check
210  *    we are still connected.
211  */
212 static int ircomm_lmp_data_indication(void *instance, void *sap,
213                                       struct sk_buff *skb)
214 {
215         struct ircomm_cb *self = (struct ircomm_cb *) instance;
216 
217         IRDA_ASSERT(self != NULL, return -1;);
218         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
219         IRDA_ASSERT(skb != NULL, return -1;);
220 
221         ircomm_do_event(self, IRCOMM_LMP_DATA_INDICATION, skb, NULL);
222 
223         /* Drop reference count - see ircomm_tty_data_indication(). */
224         dev_kfree_skb(skb);
225 
226         return 0;
227 }
228 
229 /*
230  * Function ircomm_lmp_connect_confirm (instance, sap, qos, max_sdu_size,
231  *                                       max_header_size, skb)
232  *
233  *    Connection has been confirmed by peer device
234  *
235  */
236 static void ircomm_lmp_connect_confirm(void *instance, void *sap,
237                                        struct qos_info *qos,
238                                        __u32 max_seg_size,
239                                        __u8 max_header_size,
240                                        struct sk_buff *skb)
241 {
242         struct ircomm_cb *self = (struct ircomm_cb *) instance;
243         struct ircomm_info info;
244 
245         IRDA_ASSERT(self != NULL, return;);
246         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
247         IRDA_ASSERT(skb != NULL, return;);
248         IRDA_ASSERT(qos != NULL, return;);
249 
250         info.max_data_size = max_seg_size;
251         info.max_header_size = max_header_size;
252         info.qos = qos;
253 
254         ircomm_do_event(self, IRCOMM_LMP_CONNECT_CONFIRM, skb, &info);
255 
256         /* Drop reference count - see ircomm_tty_connect_confirm(). */
257         dev_kfree_skb(skb);
258 }
259 
260 /*
261  * Function ircomm_lmp_connect_indication (instance, sap, qos, max_sdu_size,
262  *                                         max_header_size, skb)
263  *
264  *    Peer device wants to make a connection with us
265  *
266  */
267 static void ircomm_lmp_connect_indication(void *instance, void *sap,
268                                           struct qos_info *qos,
269                                           __u32 max_seg_size,
270                                           __u8 max_header_size,
271                                           struct sk_buff *skb)
272 {
273         struct ircomm_cb *self = (struct ircomm_cb *)instance;
274         struct ircomm_info info;
275 
276         IRDA_ASSERT(self != NULL, return;);
277         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
278         IRDA_ASSERT(skb != NULL, return;);
279         IRDA_ASSERT(qos != NULL, return;);
280 
281         info.max_data_size = max_seg_size;
282         info.max_header_size = max_header_size;
283         info.qos = qos;
284 
285         ircomm_do_event(self, IRCOMM_LMP_CONNECT_INDICATION, skb, &info);
286 
287         /* Drop reference count - see ircomm_tty_connect_indication(). */
288         dev_kfree_skb(skb);
289 }
290 
291 /*
292  * Function ircomm_lmp_disconnect_indication (instance, sap, reason, skb)
293  *
294  *    Peer device has closed the connection, or the link went down for some
295  *    other reason
296  */
297 static void ircomm_lmp_disconnect_indication(void *instance, void *sap,
298                                              LM_REASON reason,
299                                              struct sk_buff *skb)
300 {
301         struct ircomm_cb *self = (struct ircomm_cb *) instance;
302         struct ircomm_info info;
303 
304         IRDA_ASSERT(self != NULL, return;);
305         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
306 
307         info.reason = reason;
308 
309         ircomm_do_event(self, IRCOMM_LMP_DISCONNECT_INDICATION, skb, &info);
310 
311         /* Drop reference count - see ircomm_tty_disconnect_indication(). */
312         if(skb)
313                 dev_kfree_skb(skb);
314 }
315 /*
316  * Function ircomm_open_lsap (self)
317  *
318  *    Open LSAP. This function will only be used when using "raw" services
319  *
320  */
321 int ircomm_open_lsap(struct ircomm_cb *self)
322 {
323         notify_t notify;
324 
325         /* Register callbacks */
326         irda_notify_init(&notify);
327         notify.data_indication       = ircomm_lmp_data_indication;
328         notify.connect_confirm       = ircomm_lmp_connect_confirm;
329         notify.connect_indication    = ircomm_lmp_connect_indication;
330         notify.disconnect_indication = ircomm_lmp_disconnect_indication;
331         notify.instance = self;
332         strlcpy(notify.name, "IrCOMM", sizeof(notify.name));
333 
334         self->lsap = irlmp_open_lsap(LSAP_ANY, &notify, 0);
335         if (!self->lsap) {
336                 pr_debug("%sfailed to allocate tsap\n", __func__);
337                 return -1;
338         }
339         self->slsap_sel = self->lsap->slsap_sel;
340 
341         /*
342          *  Initialize the call-table for issuing commands
343          */
344         self->issue.data_request       = ircomm_lmp_data_request;
345         self->issue.connect_request    = ircomm_lmp_connect_request;
346         self->issue.connect_response   = ircomm_lmp_connect_response;
347         self->issue.disconnect_request = ircomm_lmp_disconnect_request;
348 
349         return 0;
350 }
351 

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