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, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
29 * MA 02111-1307 USA
30 *
31 ********************************************************************/
32
33 #include <linux/init.h>
34
35 #include <net/irda/irda.h>
36 #include <net/irda/irlmp.h>
37 #include <net/irda/iriap.h>
38 #include <net/irda/irda_device.h> /* struct irda_skb_cb */
39
40 #include <net/irda/ircomm_event.h>
41 #include <net/irda/ircomm_lmp.h>
42
43
44 /*
45 * Function ircomm_lmp_connect_request (self, userdata)
46 *
47 *
48 *
49 */
ircomm_lmp_connect_request(struct ircomm_cb * self,struct sk_buff * userdata,struct ircomm_info * info)50 static int ircomm_lmp_connect_request(struct ircomm_cb *self,
51 struct sk_buff *userdata,
52 struct ircomm_info *info)
53 {
54 int ret = 0;
55
56 IRDA_DEBUG(0, "%s()\n", __func__ );
57
58 /* Don't forget to refcount it - should be NULL anyway */
59 if(userdata)
60 skb_get(userdata);
61
62 ret = irlmp_connect_request(self->lsap, info->dlsap_sel,
63 info->saddr, info->daddr, NULL, userdata);
64 return ret;
65 }
66
67 /*
68 * Function ircomm_lmp_connect_response (self, skb)
69 *
70 *
71 *
72 */
ircomm_lmp_connect_response(struct ircomm_cb * self,struct sk_buff * userdata)73 static int ircomm_lmp_connect_response(struct ircomm_cb *self,
74 struct sk_buff *userdata)
75 {
76 struct sk_buff *tx_skb;
77 int ret;
78
79 IRDA_DEBUG(0, "%s()\n", __func__ );
80
81 /* Any userdata supplied? */
82 if (userdata == NULL) {
83 tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
84 if (!tx_skb)
85 return -ENOMEM;
86
87 /* Reserve space for MUX and LAP header */
88 skb_reserve(tx_skb, LMP_MAX_HEADER);
89 } else {
90 /*
91 * Check that the client has reserved enough space for
92 * headers
93 */
94 IRDA_ASSERT(skb_headroom(userdata) >= LMP_MAX_HEADER,
95 return -1;);
96
97 /* Don't forget to refcount it - should be NULL anyway */
98 skb_get(userdata);
99 tx_skb = userdata;
100 }
101
102 ret = irlmp_connect_response(self->lsap, tx_skb);
103
104 return 0;
105 }
106
ircomm_lmp_disconnect_request(struct ircomm_cb * self,struct sk_buff * userdata,struct ircomm_info * info)107 static int ircomm_lmp_disconnect_request(struct ircomm_cb *self,
108 struct sk_buff *userdata,
109 struct ircomm_info *info)
110 {
111 struct sk_buff *tx_skb;
112 int ret;
113
114 IRDA_DEBUG(0, "%s()\n", __func__ );
115
116 if (!userdata) {
117 tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
118 if (!tx_skb)
119 return -ENOMEM;
120
121 /* Reserve space for MUX and LAP header */
122 skb_reserve(tx_skb, LMP_MAX_HEADER);
123 userdata = tx_skb;
124 } else {
125 /* Don't forget to refcount it - should be NULL anyway */
126 skb_get(userdata);
127 }
128
129 ret = irlmp_disconnect_request(self->lsap, userdata);
130
131 return ret;
132 }
133
134 /*
135 * Function ircomm_lmp_flow_control (skb)
136 *
137 * This function is called when a data frame we have sent to IrLAP has
138 * been deallocated. We do this to make sure we don't flood IrLAP with
139 * frames, since we are not using the IrTTP flow control mechanism
140 */
ircomm_lmp_flow_control(struct sk_buff * skb)141 static void ircomm_lmp_flow_control(struct sk_buff *skb)
142 {
143 struct irda_skb_cb *cb;
144 struct ircomm_cb *self;
145 int line;
146
147 IRDA_ASSERT(skb != NULL, return;);
148
149 cb = (struct irda_skb_cb *) skb->cb;
150
151 IRDA_DEBUG(2, "%s()\n", __func__ );
152
153 line = cb->line;
154
155 self = (struct ircomm_cb *) hashbin_lock_find(ircomm, line, NULL);
156 if (!self) {
157 IRDA_DEBUG(2, "%s(), didn't find myself\n", __func__ );
158 return;
159 }
160
161 IRDA_ASSERT(self != NULL, return;);
162 IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
163
164 self->pkt_count--;
165
166 if ((self->pkt_count < 2) && (self->flow_status == FLOW_STOP)) {
167 IRDA_DEBUG(2, "%s(), asking TTY to start again!\n", __func__ );
168 self->flow_status = FLOW_START;
169 if (self->notify.flow_indication)
170 self->notify.flow_indication(self->notify.instance,
171 self, FLOW_START);
172 }
173 }
174
175 /*
176 * Function ircomm_lmp_data_request (self, userdata)
177 *
178 * Send data frame to peer device
179 *
180 */
ircomm_lmp_data_request(struct ircomm_cb * self,struct sk_buff * skb,int not_used)181 static int ircomm_lmp_data_request(struct ircomm_cb *self,
182 struct sk_buff *skb,
183 int not_used)
184 {
185 struct irda_skb_cb *cb;
186 int ret;
187
188 IRDA_ASSERT(skb != NULL, return -1;);
189
190 cb = (struct irda_skb_cb *) skb->cb;
191
192 cb->line = self->line;
193
194 IRDA_DEBUG(4, "%s(), sending frame\n", __func__ );
195
196 /* Don't forget to refcount it - see ircomm_tty_do_softint() */
197 skb_get(skb);
198
199 skb->destructor = ircomm_lmp_flow_control;
200
201 if ((self->pkt_count++ > 7) && (self->flow_status == FLOW_START)) {
202 IRDA_DEBUG(2, "%s(), asking TTY to slow down!\n", __func__ );
203 self->flow_status = FLOW_STOP;
204 if (self->notify.flow_indication)
205 self->notify.flow_indication(self->notify.instance,
206 self, FLOW_STOP);
207 }
208 ret = irlmp_data_request(self->lsap, skb);
209 if (ret) {
210 IRDA_ERROR("%s(), failed\n", __func__);
211 /* irlmp_data_request already free the packet */
212 }
213
214 return ret;
215 }
216
217 /*
218 * Function ircomm_lmp_data_indication (instance, sap, skb)
219 *
220 * Incoming data which we must deliver to the state machine, to check
221 * we are still connected.
222 */
ircomm_lmp_data_indication(void * instance,void * sap,struct sk_buff * skb)223 static int ircomm_lmp_data_indication(void *instance, void *sap,
224 struct sk_buff *skb)
225 {
226 struct ircomm_cb *self = (struct ircomm_cb *) instance;
227
228 IRDA_DEBUG(4, "%s()\n", __func__ );
229
230 IRDA_ASSERT(self != NULL, return -1;);
231 IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
232 IRDA_ASSERT(skb != NULL, return -1;);
233
234 ircomm_do_event(self, IRCOMM_LMP_DATA_INDICATION, skb, NULL);
235
236 /* Drop reference count - see ircomm_tty_data_indication(). */
237 dev_kfree_skb(skb);
238
239 return 0;
240 }
241
242 /*
243 * Function ircomm_lmp_connect_confirm (instance, sap, qos, max_sdu_size,
244 * max_header_size, skb)
245 *
246 * Connection has been confirmed by peer device
247 *
248 */
ircomm_lmp_connect_confirm(void * instance,void * sap,struct qos_info * qos,__u32 max_seg_size,__u8 max_header_size,struct sk_buff * skb)249 static void ircomm_lmp_connect_confirm(void *instance, void *sap,
250 struct qos_info *qos,
251 __u32 max_seg_size,
252 __u8 max_header_size,
253 struct sk_buff *skb)
254 {
255 struct ircomm_cb *self = (struct ircomm_cb *) instance;
256 struct ircomm_info info;
257
258 IRDA_DEBUG(0, "%s()\n", __func__ );
259
260 IRDA_ASSERT(self != NULL, return;);
261 IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
262 IRDA_ASSERT(skb != NULL, return;);
263 IRDA_ASSERT(qos != NULL, return;);
264
265 info.max_data_size = max_seg_size;
266 info.max_header_size = max_header_size;
267 info.qos = qos;
268
269 ircomm_do_event(self, IRCOMM_LMP_CONNECT_CONFIRM, skb, &info);
270
271 /* Drop reference count - see ircomm_tty_connect_confirm(). */
272 dev_kfree_skb(skb);
273 }
274
275 /*
276 * Function ircomm_lmp_connect_indication (instance, sap, qos, max_sdu_size,
277 * max_header_size, skb)
278 *
279 * Peer device wants to make a connection with us
280 *
281 */
ircomm_lmp_connect_indication(void * instance,void * sap,struct qos_info * qos,__u32 max_seg_size,__u8 max_header_size,struct sk_buff * skb)282 static void ircomm_lmp_connect_indication(void *instance, void *sap,
283 struct qos_info *qos,
284 __u32 max_seg_size,
285 __u8 max_header_size,
286 struct sk_buff *skb)
287 {
288 struct ircomm_cb *self = (struct ircomm_cb *)instance;
289 struct ircomm_info info;
290
291 IRDA_DEBUG(0, "%s()\n", __func__ );
292
293 IRDA_ASSERT(self != NULL, return;);
294 IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
295 IRDA_ASSERT(skb != NULL, return;);
296 IRDA_ASSERT(qos != NULL, return;);
297
298 info.max_data_size = max_seg_size;
299 info.max_header_size = max_header_size;
300 info.qos = qos;
301
302 ircomm_do_event(self, IRCOMM_LMP_CONNECT_INDICATION, skb, &info);
303
304 /* Drop reference count - see ircomm_tty_connect_indication(). */
305 dev_kfree_skb(skb);
306 }
307
308 /*
309 * Function ircomm_lmp_disconnect_indication (instance, sap, reason, skb)
310 *
311 * Peer device has closed the connection, or the link went down for some
312 * other reason
313 */
ircomm_lmp_disconnect_indication(void * instance,void * sap,LM_REASON reason,struct sk_buff * skb)314 static void ircomm_lmp_disconnect_indication(void *instance, void *sap,
315 LM_REASON reason,
316 struct sk_buff *skb)
317 {
318 struct ircomm_cb *self = (struct ircomm_cb *) instance;
319 struct ircomm_info info;
320
321 IRDA_DEBUG(0, "%s()\n", __func__ );
322
323 IRDA_ASSERT(self != NULL, return;);
324 IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
325
326 info.reason = reason;
327
328 ircomm_do_event(self, IRCOMM_LMP_DISCONNECT_INDICATION, skb, &info);
329
330 /* Drop reference count - see ircomm_tty_disconnect_indication(). */
331 if(skb)
332 dev_kfree_skb(skb);
333 }
334 /*
335 * Function ircomm_open_lsap (self)
336 *
337 * Open LSAP. This function will only be used when using "raw" services
338 *
339 */
ircomm_open_lsap(struct ircomm_cb * self)340 int ircomm_open_lsap(struct ircomm_cb *self)
341 {
342 notify_t notify;
343
344 IRDA_DEBUG(0, "%s()\n", __func__ );
345
346 /* Register callbacks */
347 irda_notify_init(¬ify);
348 notify.data_indication = ircomm_lmp_data_indication;
349 notify.connect_confirm = ircomm_lmp_connect_confirm;
350 notify.connect_indication = ircomm_lmp_connect_indication;
351 notify.disconnect_indication = ircomm_lmp_disconnect_indication;
352 notify.instance = self;
353 strlcpy(notify.name, "IrCOMM", sizeof(notify.name));
354
355 self->lsap = irlmp_open_lsap(LSAP_ANY, ¬ify, 0);
356 if (!self->lsap) {
357 IRDA_DEBUG(0,"%sfailed to allocate tsap\n", __func__ );
358 return -1;
359 }
360 self->slsap_sel = self->lsap->slsap_sel;
361
362 /*
363 * Initialize the call-table for issuing commands
364 */
365 self->issue.data_request = ircomm_lmp_data_request;
366 self->issue.connect_request = ircomm_lmp_connect_request;
367 self->issue.connect_response = ircomm_lmp_connect_response;
368 self->issue.disconnect_request = ircomm_lmp_disconnect_request;
369
370 return 0;
371 }
372