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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*********************************************************************
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +09002 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * 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
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +090012 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 * Copyright (c) 1999 Dag Brattli, All Rights Reserved.
14 * Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +090015 *
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070019 * the License, or (at your option) any later version.
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +090020 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070021 * 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.
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +090025 *
26 * You should have received a copy of the GNU General Public License
Jeff Kirsherd3770502013-12-06 09:13:43 -080027 * along with this program; if not, see <http://www.gnu.org/licenses/>.
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +090028 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 ********************************************************************/
30
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/init.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090032#include <linux/gfp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
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 *
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +090046 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 *
48 */
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +090049static int ircomm_lmp_connect_request(struct ircomm_cb *self,
50 struct sk_buff *userdata,
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 struct ircomm_info *info)
52{
53 int ret = 0;
54
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 /* 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,
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +090060 info->saddr, info->daddr, NULL, userdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 return ret;
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +090062}
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
64/*
65 * Function ircomm_lmp_connect_response (self, skb)
66 *
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +090067 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 *
69 */
70static int ircomm_lmp_connect_response(struct ircomm_cb *self,
71 struct sk_buff *userdata)
72{
73 struct sk_buff *tx_skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 /* Any userdata supplied? */
76 if (userdata == NULL) {
Samuel Ortiz1b0fee72006-09-27 20:06:44 -070077 tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 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 {
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +090084 /*
85 * Check that the client has reserved enough space for
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 * 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
David S. Miller8ce6eb12011-05-19 18:58:39 -040096 return irlmp_connect_response(self->lsap, tx_skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097}
98
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +090099static int ircomm_lmp_disconnect_request(struct ircomm_cb *self,
100 struct sk_buff *userdata,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 struct ircomm_info *info)
102{
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900103 struct sk_buff *tx_skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 int ret;
105
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900106 if (!userdata) {
Samuel Ortiz1b0fee72006-09-27 20:06:44 -0700107 tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 if (!tx_skb)
109 return -ENOMEM;
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900110
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 /* Reserve space for MUX and LAP header */
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900112 skb_reserve(tx_skb, LMP_MAX_HEADER);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 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
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900128 * been deallocated. We do this to make sure we don't flood IrLAP with
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 * frames, since we are not using the IrTTP flow control mechanism
130 */
131static 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
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900141 line = cb->line;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
143 self = (struct ircomm_cb *) hashbin_lock_find(ircomm, line, NULL);
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900144 if (!self) {
Joe Perches955a9d202014-11-11 14:44:57 -0800145 pr_debug("%s(), didn't find myself\n", __func__);
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900146 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 }
148
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900149 IRDA_ASSERT(self != NULL, return;);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
151
152 self->pkt_count--;
153
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900154 if ((self->pkt_count < 2) && (self->flow_status == FLOW_STOP)) {
Joe Perches955a9d202014-11-11 14:44:57 -0800155 pr_debug("%s(), asking TTY to start again!\n", __func__);
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900156 self->flow_status = FLOW_START;
157 if (self->notify.flow_indication)
158 self->notify.flow_indication(self->notify.instance,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 self, FLOW_START);
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900160 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161}
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900162
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163/*
164 * Function ircomm_lmp_data_request (self, userdata)
165 *
166 * Send data frame to peer device
167 *
168 */
169static int ircomm_lmp_data_request(struct ircomm_cb *self,
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900170 struct sk_buff *skb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 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;
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900179
180 cb->line = self->line;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
Joe Perches955a9d202014-11-11 14:44:57 -0800182 pr_debug("%s(), sending frame\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
184 /* Don't forget to refcount it - see ircomm_tty_do_softint() */
185 skb_get(skb);
186
Herbert Xud55d87f2009-06-22 02:25:25 +0000187 skb_orphan(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 skb->destructor = ircomm_lmp_flow_control;
189
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900190 if ((self->pkt_count++ > 7) && (self->flow_status == FLOW_START)) {
Joe Perches955a9d202014-11-11 14:44:57 -0800191 pr_debug("%s(), asking TTY to slow down!\n", __func__);
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900192 self->flow_status = FLOW_STOP;
193 if (self->notify.flow_indication)
194 self->notify.flow_indication(self->notify.instance,
195 self, FLOW_STOP);
196 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 ret = irlmp_data_request(self->lsap, skb);
198 if (ret) {
Joe Perches6c910232014-11-11 13:37:30 -0800199 net_err_ratelimited("%s(), failed\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 /* 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 */
212static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 IRDA_ASSERT(self != NULL, return -1;);
218 IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
219 IRDA_ASSERT(skb != NULL, return -1;);
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900220
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 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/*
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900230 * Function ircomm_lmp_connect_confirm (instance, sap, qos, max_sdu_size,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 * max_header_size, skb)
232 *
233 * Connection has been confirmed by peer device
234 *
235 */
236static void ircomm_lmp_connect_confirm(void *instance, void *sap,
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900237 struct qos_info *qos,
238 __u32 max_seg_size,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 __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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 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 */
267static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 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 */
YOSHIFUJI Hideaki6819bc22007-02-09 23:24:53 +0900297static void ircomm_lmp_disconnect_indication(void *instance, void *sap,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 LM_REASON reason,
299 struct sk_buff *skb)
300{
301 struct ircomm_cb *self = (struct ircomm_cb *) instance;
302 struct ircomm_info info;
303
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 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 */
321int ircomm_open_lsap(struct ircomm_cb *self)
322{
323 notify_t notify;
324
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 /* 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) {
Joe Perches955a9d202014-11-11 14:44:57 -0800336 pr_debug("%sfailed to allocate tsap\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 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}