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 */
ircomm_lmp_connect_request(struct ircomm_cb * self,struct sk_buff * userdata,struct ircomm_info * info)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 */
ircomm_lmp_connect_response(struct ircomm_cb * self,struct sk_buff * userdata)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
ircomm_lmp_disconnect_request(struct ircomm_cb * self,struct sk_buff * userdata,struct ircomm_info * info)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 */
ircomm_lmp_flow_control(struct sk_buff * skb)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 */
ircomm_lmp_data_request(struct ircomm_cb * self,struct sk_buff * skb,int not_used)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 */
ircomm_lmp_data_indication(void * instance,void * sap,struct sk_buff * skb)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 */
ircomm_lmp_connect_confirm(void * instance,void * sap,struct qos_info * qos,__u32 max_seg_size,__u8 max_header_size,struct sk_buff * skb)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 */
ircomm_lmp_connect_indication(void * instance,void * sap,struct qos_info * qos,__u32 max_seg_size,__u8 max_header_size,struct sk_buff * skb)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 */
ircomm_lmp_disconnect_indication(void * instance,void * sap,LM_REASON reason,struct sk_buff * skb)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 */
ircomm_open_lsap(struct ircomm_cb * self)321 int ircomm_open_lsap(struct ircomm_cb *self)
322 {
323 notify_t notify;
324
325 /* Register callbacks */
326 irda_notify_init(¬ify);
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, ¬ify, 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