net/irda/ircomm/ircomm_ttp.c

   1 /*********************************************************************
   2  *
   3  * Filename:      ircomm_ttp.c
   4  * Version:       1.0
   5  * Description:   Interface between IrCOMM and IrTTP
   6  * Status:        Stable
   7  * Author:        Dag Brattli <dagb@cs.uit.no>
   8  * Created at:    Sun Jun  6 20:48:27 1999
   9  * Modified at:   Mon Dec 13 11:35:13 1999
  10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11  *
  12  *     Copyright (c) 1999 Dag Brattli, All Rights Reserved.
  13  *     Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
  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 #include <net/irda/irttp.h>
  39
  40 #include <net/irda/ircomm_event.h>
  41 #include <net/irda/ircomm_ttp.h>
  42
  43 /*
  44  * Function ircomm_open_tsap (self)
  45  *
  46  *
  47  *
  48  */
  49 int ircomm_open_tsap(struct ircomm_cb *self)
  50 {
  51         notify_t notify;
  52
  53         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
  54
  55         /* Register callbacks */
  56         irda_notify_init(&notify);
  57         notify.data_indication       = ircomm_ttp_data_indication;
  58         notify.connect_confirm       = ircomm_ttp_connect_confirm;
  59         notify.connect_indication    = ircomm_ttp_connect_indication;
  60         notify.flow_indication       = ircomm_ttp_flow_indication;
  61         notify.disconnect_indication = ircomm_ttp_disconnect_indication;
  62         notify.instance = self;
  63         strlcpy(notify.name, "IrCOMM", sizeof(notify.name));
  64
  65         self->tsap = irttp_open_tsap(LSAP_ANY, DEFAULT_INITIAL_CREDIT,
  66                                      &notify);
  67         if (!self->tsap) {
  68                 IRDA_DEBUG(0, "%sfailed to allocate tsap\n", __FUNCTION__ );
  69                 return -1;
  70         }
  71         self->slsap_sel = self->tsap->stsap_sel;
  72
  73         /*
  74          *  Initialize the call-table for issuing commands
  75          */
  76         self->issue.data_request       = ircomm_ttp_data_request;
  77         self->issue.connect_request    = ircomm_ttp_connect_request;
  78         self->issue.connect_response   = ircomm_ttp_connect_response;
  79         self->issue.disconnect_request = ircomm_ttp_disconnect_request;
  80
  81         return 0;
  82 }
  83
  84 /*
  85  * Function ircomm_ttp_connect_request (self, userdata)
  86  *
  87  *
  88  *
  89  */
  90 int ircomm_ttp_connect_request(struct ircomm_cb *self,
  91                                struct sk_buff *userdata,
  92                                struct ircomm_info *info)
  93 {
  94         int ret = 0;
  95
  96         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
  97
  98         /* Don't forget to refcount it - should be NULL anyway */
  99         if(userdata)
 100                 skb_get(userdata);
 101
 102         ret = irttp_connect_request(self->tsap, info->dlsap_sel,
 103                                     info->saddr, info->daddr, NULL,
 104                                     TTP_SAR_DISABLE, userdata);
 105
 106         return ret;
 107 }
 108
 109 /*
 110  * Function ircomm_ttp_connect_response (self, skb)
 111  *
 112  *
 113  *
 114  */
 115 int ircomm_ttp_connect_response(struct ircomm_cb *self,
 116                                 struct sk_buff *userdata)
 117 {
 118         int ret;
 119
 120         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
 121
 122         /* Don't forget to refcount it - should be NULL anyway */
 123         if(userdata)
 124                 skb_get(userdata);
 125
 126         ret = irttp_connect_response(self->tsap, TTP_SAR_DISABLE, userdata);
 127
 128         return ret;
 129 }
 130
 131 /*
 132  * Function ircomm_ttp_data_request (self, userdata)
 133  *
 134  *    Send IrCOMM data to IrTTP layer. Currently we do not try to combine
 135  *    control data with pure data, so they will be sent as separate frames.
 136  *    Should not be a big problem though, since control frames are rare. But
 137  *    some of them are sent after connection establishment, so this can
 138  *    increase the latency a bit.
 139  */
 140 int ircomm_ttp_data_request(struct ircomm_cb *self,
 141                             struct sk_buff *skb,
 142                             int clen)
 143 {
 144         int ret;
 145
 146         ASSERT(skb != NULL, return -1;);
 147
 148         IRDA_DEBUG(2, "%s(), clen=%d\n", __FUNCTION__ , clen);
 149
 150         /*
 151          * Insert clen field, currently we either send data only, or control
 152          * only frames, to make things easier and avoid queueing
 153          */
 154         ASSERT(skb_headroom(skb) >= IRCOMM_HEADER_SIZE, return -1;);
 155
 156         /* Don't forget to refcount it - see ircomm_tty_do_softint() */
 157         skb_get(skb);
 158
 159         skb_push(skb, IRCOMM_HEADER_SIZE);
 160
 161         skb->data[0] = clen;
 162
 163         ret = irttp_data_request(self->tsap, skb);
 164         if (ret) {
 165                 ERROR("%s(), failed\n", __FUNCTION__);
 166                 /* irttp_data_request already free the packet */
 167         }
 168
 169         return ret;
 170 }
 171
 172 /*
 173  * Function ircomm_ttp_data_indication (instance, sap, skb)
 174  *
 175  *    Incoming data
 176  *
 177  */
 178 int ircomm_ttp_data_indication(void *instance, void *sap,
 179                                struct sk_buff *skb)
 180 {
 181         struct ircomm_cb *self = (struct ircomm_cb *) instance;
 182
 183         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
 184
 185         ASSERT(self != NULL, return -1;);
 186         ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
 187         ASSERT(skb != NULL, return -1;);
 188
 189         ircomm_do_event(self, IRCOMM_TTP_DATA_INDICATION, skb, NULL);
 190
 191         /* Drop reference count - see ircomm_tty_data_indication(). */
 192         dev_kfree_skb(skb);
 193
 194         return 0;
 195 }
 196
 197 void ircomm_ttp_connect_confirm(void *instance, void *sap,
 198                                 struct qos_info *qos,
 199                                 __u32 max_sdu_size,
 200                                 __u8 max_header_size,
 201                                 struct sk_buff *skb)
 202 {
 203         struct ircomm_cb *self = (struct ircomm_cb *) instance;
 204         struct ircomm_info info;
 205
 206         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
 207
 208         ASSERT(self != NULL, return;);
 209         ASSERT(self->magic == IRCOMM_MAGIC, return;);
 210         ASSERT(skb != NULL, return;);
 211         ASSERT(qos != NULL, goto out;);
 212
 213         if (max_sdu_size != TTP_SAR_DISABLE) {
 214                 ERROR("%s(), SAR not allowed for IrCOMM!\n", __FUNCTION__);
 215                 goto out;
 216         }
 217
 218         info.max_data_size = irttp_get_max_seg_size(self->tsap)
 219                 - IRCOMM_HEADER_SIZE;
 220         info.max_header_size = max_header_size + IRCOMM_HEADER_SIZE;
 221         info.qos = qos;
 222
 223         ircomm_do_event(self, IRCOMM_TTP_CONNECT_CONFIRM, skb, &info);
 224
 225 out:
 226         /* Drop reference count - see ircomm_tty_connect_confirm(). */
 227         dev_kfree_skb(skb);
 228 }
 229
 230 /*
 231  * Function ircomm_ttp_connect_indication (instance, sap, qos, max_sdu_size,
 232  *                                         max_header_size, skb)
 233  *
 234  *
 235  *
 236  */
 237 void ircomm_ttp_connect_indication(void *instance, void *sap,
 238                                    struct qos_info *qos,
 239                                    __u32 max_sdu_size,
 240                                    __u8 max_header_size,
 241                                    struct sk_buff *skb)
 242 {
 243         struct ircomm_cb *self = (struct ircomm_cb *)instance;
 244         struct ircomm_info info;
 245
 246         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
 247
 248         ASSERT(self != NULL, return;);
 249         ASSERT(self->magic == IRCOMM_MAGIC, return;);
 250         ASSERT(skb != NULL, return;);
 251         ASSERT(qos != NULL, goto out;);
 252
 253         if (max_sdu_size != TTP_SAR_DISABLE) {
 254                 ERROR("%s(), SAR not allowed for IrCOMM!\n", __FUNCTION__);
 255                 goto out;
 256         }
 257
 258         info.max_data_size = irttp_get_max_seg_size(self->tsap)
 259                 - IRCOMM_HEADER_SIZE;
 260         info.max_header_size = max_header_size + IRCOMM_HEADER_SIZE;
 261         info.qos = qos;
 262
 263         ircomm_do_event(self, IRCOMM_TTP_CONNECT_INDICATION, skb, &info);
 264
 265 out:
 266         /* Drop reference count - see ircomm_tty_connect_indication(). */
 267         dev_kfree_skb(skb);
 268 }
 269
 270 /*
 271  * Function ircomm_ttp_disconnect_request (self, userdata, info)
 272  *
 273  *
 274  *
 275  */
 276 int ircomm_ttp_disconnect_request(struct ircomm_cb *self,
 277                                   struct sk_buff *userdata,
 278                                   struct ircomm_info *info)
 279 {
 280         int ret;
 281
 282         /* Don't forget to refcount it - should be NULL anyway */
 283         if(userdata)
 284                 skb_get(userdata);
 285
 286         ret = irttp_disconnect_request(self->tsap, userdata, P_NORMAL);
 287
 288         return ret;
 289 }
 290
 291 /*
 292  * Function ircomm_ttp_disconnect_indication (instance, sap, reason, skb)
 293  *
 294  *
 295  *
 296  */
 297 void ircomm_ttp_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_DEBUG(2, "%s()\n", __FUNCTION__ );
 305
 306         ASSERT(self != NULL, return;);
 307         ASSERT(self->magic == IRCOMM_MAGIC, return;);
 308
 309         info.reason = reason;
 310
 311         ircomm_do_event(self, IRCOMM_TTP_DISCONNECT_INDICATION, skb, &info);
 312
 313         /* Drop reference count - see ircomm_tty_disconnect_indication(). */
 314         if(skb)
 315                 dev_kfree_skb(skb);
 316 }
 317
 318 /*
 319  * Function ircomm_ttp_flow_indication (instance, sap, cmd)
 320  *
 321  *    Layer below is telling us to start or stop the flow of data
 322  *
 323  */
 324 void ircomm_ttp_flow_indication(void *instance, void *sap, LOCAL_FLOW cmd)
 325 {
 326         struct ircomm_cb *self = (struct ircomm_cb *) instance;
 327
 328         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
 329
 330         ASSERT(self != NULL, return;);
 331         ASSERT(self->magic == IRCOMM_MAGIC, return;);
 332
 333         if (self->notify.flow_indication)
 334                 self->notify.flow_indication(self->notify.instance, self, cmd);
 335 }
 336
 337