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