Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /********************************************************************* |
6819bc2e | 2 | * |
1da177e4 LT |
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 | |
6819bc2e | 12 | * |
1da177e4 LT |
13 | * Copyright (c) 1999 Dag Brattli, All Rights Reserved. |
14 | * Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com> | |
6819bc2e YH |
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 | |
1da177e4 | 19 | * the License, or (at your option) any later version. |
6819bc2e | 20 | * |
1da177e4 LT |
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. | |
6819bc2e YH |
25 | * |
26 | * You should have received a copy of the GNU General Public License | |
d3770509 | 27 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
6819bc2e | 28 | * |
1da177e4 LT |
29 | ********************************************************************/ |
30 | ||
1da177e4 | 31 | #include <linux/init.h> |
5a0e3ad6 | 32 | #include <linux/gfp.h> |
1da177e4 LT |
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 | * | |
6819bc2e | 46 | * |
1da177e4 LT |
47 | * |
48 | */ | |
6819bc2e YH |
49 | static int ircomm_lmp_connect_request(struct ircomm_cb *self, |
50 | struct sk_buff *userdata, | |
1da177e4 LT |
51 | struct ircomm_info *info) |
52 | { | |
53 | int ret = 0; | |
54 | ||
1da177e4 LT |
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, | |
6819bc2e | 60 | info->saddr, info->daddr, NULL, userdata); |
1da177e4 | 61 | return ret; |
6819bc2e | 62 | } |
1da177e4 LT |
63 | |
64 | /* | |
65 | * Function ircomm_lmp_connect_response (self, skb) | |
66 | * | |
6819bc2e | 67 | * |
1da177e4 LT |
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; | |
1da177e4 | 74 | |
1da177e4 LT |
75 | /* Any userdata supplied? */ |
76 | if (userdata == NULL) { | |
1b0fee7d | 77 | tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC); |
1da177e4 LT |
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 { | |
6819bc2e YH |
84 | /* |
85 | * Check that the client has reserved enough space for | |
1da177e4 LT |
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 | ||
8ce6eb1a | 96 | return irlmp_connect_response(self->lsap, tx_skb); |
1da177e4 LT |
97 | } |
98 | ||
6819bc2e YH |
99 | static int ircomm_lmp_disconnect_request(struct ircomm_cb *self, |
100 | struct sk_buff *userdata, | |
1da177e4 LT |
101 | struct ircomm_info *info) |
102 | { | |
6819bc2e | 103 | struct sk_buff *tx_skb; |
1da177e4 LT |
104 | int ret; |
105 | ||
6819bc2e | 106 | if (!userdata) { |
1b0fee7d | 107 | tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC); |
1da177e4 LT |
108 | if (!tx_skb) |
109 | return -ENOMEM; | |
6819bc2e | 110 | |
1da177e4 | 111 | /* Reserve space for MUX and LAP header */ |
6819bc2e | 112 | skb_reserve(tx_skb, LMP_MAX_HEADER); |
1da177e4 LT |
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 | |
6819bc2e | 128 | * been deallocated. We do this to make sure we don't flood IrLAP with |
1da177e4 LT |
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 | ||
6819bc2e | 141 | line = cb->line; |
1da177e4 LT |
142 | |
143 | self = (struct ircomm_cb *) hashbin_lock_find(ircomm, line, NULL); | |
6819bc2e | 144 | if (!self) { |
955a9d20 | 145 | pr_debug("%s(), didn't find myself\n", __func__); |
6819bc2e | 146 | return; |
1da177e4 LT |
147 | } |
148 | ||
6819bc2e | 149 | IRDA_ASSERT(self != NULL, return;); |
1da177e4 LT |
150 | IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;); |
151 | ||
152 | self->pkt_count--; | |
153 | ||
6819bc2e | 154 | if ((self->pkt_count < 2) && (self->flow_status == FLOW_STOP)) { |
955a9d20 | 155 | pr_debug("%s(), asking TTY to start again!\n", __func__); |
6819bc2e YH |
156 | self->flow_status = FLOW_START; |
157 | if (self->notify.flow_indication) | |
158 | self->notify.flow_indication(self->notify.instance, | |
1da177e4 | 159 | self, FLOW_START); |
6819bc2e | 160 | } |
1da177e4 | 161 | } |
6819bc2e | 162 | |
1da177e4 LT |
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, | |
6819bc2e | 170 | struct sk_buff *skb, |
1da177e4 LT |
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; | |
6819bc2e YH |
179 | |
180 | cb->line = self->line; | |
1da177e4 | 181 | |
955a9d20 | 182 | pr_debug("%s(), sending frame\n", __func__); |
1da177e4 LT |
183 | |
184 | /* Don't forget to refcount it - see ircomm_tty_do_softint() */ | |
185 | skb_get(skb); | |
186 | ||
d55d87fd | 187 | skb_orphan(skb); |
1da177e4 LT |
188 | skb->destructor = ircomm_lmp_flow_control; |
189 | ||
6819bc2e | 190 | if ((self->pkt_count++ > 7) && (self->flow_status == FLOW_START)) { |
955a9d20 | 191 | pr_debug("%s(), asking TTY to slow down!\n", __func__); |
6819bc2e YH |
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 | } | |
1da177e4 LT |
197 | ret = irlmp_data_request(self->lsap, skb); |
198 | if (ret) { | |
6c91023d | 199 | net_err_ratelimited("%s(), failed\n", __func__); |
1da177e4 LT |
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 | ||
1da177e4 LT |
217 | IRDA_ASSERT(self != NULL, return -1;); |
218 | IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;); | |
219 | IRDA_ASSERT(skb != NULL, return -1;); | |
6819bc2e | 220 | |
1da177e4 LT |
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 | /* | |
6819bc2e | 230 | * Function ircomm_lmp_connect_confirm (instance, sap, qos, max_sdu_size, |
1da177e4 LT |
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, | |
6819bc2e YH |
237 | struct qos_info *qos, |
238 | __u32 max_seg_size, | |
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | */ | |
6819bc2e | 297 | static void ircomm_lmp_disconnect_indication(void *instance, void *sap, |
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | ||
1da177e4 LT |
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) { | |
955a9d20 | 336 | pr_debug("%sfailed to allocate tsap\n", __func__); |
1da177e4 LT |
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 | } |