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/init.h>
  33
  34 #include <net/irda/irda.h>
  35 #include <net/irda/irlmp.h>
  36 #include <net/irda/iriap.h>
  37 #include <net/irda/irttp.h>
  38
  39 #include <net/irda/ircomm_event.h>
  40 #include <net/irda/ircomm_ttp.h>
  41
  42 static int ircomm_ttp_data_indication(void *instance, void *sap,
  43                                       struct sk_buff *skb);
  44 static void ircomm_ttp_connect_confirm(void *instance, void *sap,
  45                                        struct qos_info *qos,
  46                                        __u32 max_sdu_size,
  47                                        __u8 max_header_size,
  48                                        struct sk_buff *skb);
  49 static void ircomm_ttp_connect_indication(void *instance, void *sap,
  50                                           struct qos_info *qos,
  51                                           __u32 max_sdu_size,
  52                                           __u8 max_header_size,
  53                                           struct sk_buff *skb);
  54 static void ircomm_ttp_flow_indication(void *instance, void *sap,
  55                                        LOCAL_FLOW cmd);
  56 static void ircomm_ttp_disconnect_indication(void *instance, void *sap,
  57                                              LM_REASON reason,
  58                                              struct sk_buff *skb);
  59 static int ircomm_ttp_data_request(struct ircomm_cb *self,
  60                                    struct sk_buff *skb,
  61                                    int clen);
  62 static int ircomm_ttp_connect_request(struct ircomm_cb *self,
  63                                       struct sk_buff *userdata,
  64                                       struct ircomm_info *info);
  65 static int ircomm_ttp_connect_response(struct ircomm_cb *self,
  66                                        struct sk_buff *userdata);
  67 static int ircomm_ttp_disconnect_request(struct ircomm_cb *self,
  68                                          struct sk_buff *userdata,
  69                                          struct ircomm_info *info);
  70
  71 /*
  72  * Function ircomm_open_tsap (self)
  73  *
  74  *
  75  *
  76  */
  77 int ircomm_open_tsap(struct ircomm_cb *self)
  78 {
  79         notify_t notify;
  80
  81         IRDA_DEBUG(4, "%s()\n", __func__ );
  82
  83         /* Register callbacks */
  84         irda_notify_init(&notify);
  85         notify.data_indication       = ircomm_ttp_data_indication;
  86         notify.connect_confirm       = ircomm_ttp_connect_confirm;
  87         notify.connect_indication    = ircomm_ttp_connect_indication;
  88         notify.flow_indication       = ircomm_ttp_flow_indication;
  89         notify.disconnect_indication = ircomm_ttp_disconnect_indication;
  90         notify.instance = self;
  91         strlcpy(notify.name, "IrCOMM", sizeof(notify.name));
  92
  93         self->tsap = irttp_open_tsap(LSAP_ANY, DEFAULT_INITIAL_CREDIT,
  94                                      &notify);
  95         if (!self->tsap) {
  96                 IRDA_DEBUG(0, "%sfailed to allocate tsap\n", __func__ );
  97                 return -1;
  98         }
  99         self->slsap_sel = self->tsap->stsap_sel;
 100
 101         /*
 102          *  Initialize the call-table for issuing commands
 103          */
 104         self->issue.data_request       = ircomm_ttp_data_request;
 105         self->issue.connect_request    = ircomm_ttp_connect_request;
 106         self->issue.connect_response   = ircomm_ttp_connect_response;
 107         self->issue.disconnect_request = ircomm_ttp_disconnect_request;
 108
 109         return 0;
 110 }
 111
 112 /*
 113  * Function ircomm_ttp_connect_request (self, userdata)
 114  *
 115  *
 116  *
 117  */
 118 static int ircomm_ttp_connect_request(struct ircomm_cb *self,
 119                                       struct sk_buff *userdata,
 120                                       struct ircomm_info *info)
 121 {
 122         int ret = 0;
 123
 124         IRDA_DEBUG(4, "%s()\n", __func__ );
 125
 126         /* Don't forget to refcount it - should be NULL anyway */
 127         if(userdata)
 128                 skb_get(userdata);
 129
 130         ret = irttp_connect_request(self->tsap, info->dlsap_sel,
 131                                     info->saddr, info->daddr, NULL,
 132                                     TTP_SAR_DISABLE, userdata);
 133
 134         return ret;
 135 }
 136
 137 /*
 138  * Function ircomm_ttp_connect_response (self, skb)
 139  *
 140  *
 141  *
 142  */
 143 static int ircomm_ttp_connect_response(struct ircomm_cb *self,
 144                                        struct sk_buff *userdata)
 145 {
 146         int ret;
 147
 148         IRDA_DEBUG(4, "%s()\n", __func__ );
 149
 150         /* Don't forget to refcount it - should be NULL anyway */
 151         if(userdata)
 152                 skb_get(userdata);
 153
 154         ret = irttp_connect_response(self->tsap, TTP_SAR_DISABLE, userdata);
 155
 156         return ret;
 157 }
 158
 159 /*
 160  * Function ircomm_ttp_data_request (self, userdata)
 161  *
 162  *    Send IrCOMM data to IrTTP layer. Currently we do not try to combine
 163  *    control data with pure data, so they will be sent as separate frames.
 164  *    Should not be a big problem though, since control frames are rare. But
 165  *    some of them are sent after connection establishment, so this can
 166  *    increase the latency a bit.
 167  */
 168 static int ircomm_ttp_data_request(struct ircomm_cb *self,
 169                                    struct sk_buff *skb,
 170                                    int clen)
 171 {
 172         int ret;
 173
 174         IRDA_ASSERT(skb != NULL, return -1;);
 175
 176         IRDA_DEBUG(2, "%s(), clen=%d\n", __func__ , clen);
 177
 178         /*
 179          * Insert clen field, currently we either send data only, or control
 180          * only frames, to make things easier and avoid queueing
 181          */
 182         IRDA_ASSERT(skb_headroom(skb) >= IRCOMM_HEADER_SIZE, return -1;);
 183
 184         /* Don't forget to refcount it - see ircomm_tty_do_softint() */
 185         skb_get(skb);
 186
 187         skb_push(skb, IRCOMM_HEADER_SIZE);
 188
 189         skb->data[0] = clen;
 190
 191         ret = irttp_data_request(self->tsap, skb);
 192         if (ret) {
 193                 IRDA_ERROR("%s(), failed\n", __func__);
 194                 /* irttp_data_request already free the packet */
 195         }
 196
 197         return ret;
 198 }
 199
 200 /*
 201  * Function ircomm_ttp_data_indication (instance, sap, skb)
 202  *
 203  *    Incoming data
 204  *
 205  */
 206 static int ircomm_ttp_data_indication(void *instance, void *sap,
 207                                       struct sk_buff *skb)
 208 {
 209         struct ircomm_cb *self = (struct ircomm_cb *) instance;
 210
 211         IRDA_DEBUG(4, "%s()\n", __func__ );
 212
 213         IRDA_ASSERT(self != NULL, return -1;);
 214         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
 215         IRDA_ASSERT(skb != NULL, return -1;);
 216
 217         ircomm_do_event(self, IRCOMM_TTP_DATA_INDICATION, skb, NULL);
 218
 219         /* Drop reference count - see ircomm_tty_data_indication(). */
 220         dev_kfree_skb(skb);
 221
 222         return 0;
 223 }
 224
 225 static void ircomm_ttp_connect_confirm(void *instance, void *sap,
 226                                        struct qos_info *qos,
 227                                        __u32 max_sdu_size,
 228                                        __u8 max_header_size,
 229                                        struct sk_buff *skb)
 230 {
 231         struct ircomm_cb *self = (struct ircomm_cb *) instance;
 232         struct ircomm_info info;
 233
 234         IRDA_DEBUG(4, "%s()\n", __func__ );
 235
 236         IRDA_ASSERT(self != NULL, return;);
 237         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
 238         IRDA_ASSERT(skb != NULL, return;);
 239         IRDA_ASSERT(qos != NULL, goto out;);
 240
 241         if (max_sdu_size != TTP_SAR_DISABLE) {
 242                 IRDA_ERROR("%s(), SAR not allowed for IrCOMM!\n",
 243                            __func__);
 244                 goto out;
 245         }
 246
 247         info.max_data_size = irttp_get_max_seg_size(self->tsap)
 248                 - IRCOMM_HEADER_SIZE;
 249         info.max_header_size = max_header_size + IRCOMM_HEADER_SIZE;
 250         info.qos = qos;
 251
 252         ircomm_do_event(self, IRCOMM_TTP_CONNECT_CONFIRM, skb, &info);
 253
 254 out:
 255         /* Drop reference count - see ircomm_tty_connect_confirm(). */
 256         dev_kfree_skb(skb);
 257 }
 258
 259 /*
 260  * Function ircomm_ttp_connect_indication (instance, sap, qos, max_sdu_size,
 261  *                                         max_header_size, skb)
 262  *
 263  *
 264  *
 265  */
 266 static void ircomm_ttp_connect_indication(void *instance, void *sap,
 267                                           struct qos_info *qos,
 268                                           __u32 max_sdu_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(4, "%s()\n", __func__ );
 276
 277         IRDA_ASSERT(self != NULL, return;);
 278         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
 279         IRDA_ASSERT(skb != NULL, return;);
 280         IRDA_ASSERT(qos != NULL, goto out;);
 281
 282         if (max_sdu_size != TTP_SAR_DISABLE) {
 283                 IRDA_ERROR("%s(), SAR not allowed for IrCOMM!\n",
 284                            __func__);
 285                 goto out;
 286         }
 287
 288         info.max_data_size = irttp_get_max_seg_size(self->tsap)
 289                 - IRCOMM_HEADER_SIZE;
 290         info.max_header_size = max_header_size + IRCOMM_HEADER_SIZE;
 291         info.qos = qos;
 292
 293         ircomm_do_event(self, IRCOMM_TTP_CONNECT_INDICATION, skb, &info);
 294
 295 out:
 296         /* Drop reference count - see ircomm_tty_connect_indication(). */
 297         dev_kfree_skb(skb);
 298 }
 299
 300 /*
 301  * Function ircomm_ttp_disconnect_request (self, userdata, info)
 302  *
 303  *
 304  *
 305  */
 306 static int ircomm_ttp_disconnect_request(struct ircomm_cb *self,
 307                                          struct sk_buff *userdata,
 308                                          struct ircomm_info *info)
 309 {
 310         int ret;
 311
 312         /* Don't forget to refcount it - should be NULL anyway */
 313         if(userdata)
 314                 skb_get(userdata);
 315
 316         ret = irttp_disconnect_request(self->tsap, userdata, P_NORMAL);
 317
 318         return ret;
 319 }
 320
 321 /*
 322  * Function ircomm_ttp_disconnect_indication (instance, sap, reason, skb)
 323  *
 324  *
 325  *
 326  */
 327 static void ircomm_ttp_disconnect_indication(void *instance, void *sap,
 328                                              LM_REASON reason,
 329                                              struct sk_buff *skb)
 330 {
 331         struct ircomm_cb *self = (struct ircomm_cb *) instance;
 332         struct ircomm_info info;
 333
 334         IRDA_DEBUG(2, "%s()\n", __func__ );
 335
 336         IRDA_ASSERT(self != NULL, return;);
 337         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
 338
 339         info.reason = reason;
 340
 341         ircomm_do_event(self, IRCOMM_TTP_DISCONNECT_INDICATION, skb, &info);
 342
 343         /* Drop reference count - see ircomm_tty_disconnect_indication(). */
 344         if(skb)
 345                 dev_kfree_skb(skb);
 346 }
 347
 348 /*
 349  * Function ircomm_ttp_flow_indication (instance, sap, cmd)
 350  *
 351  *    Layer below is telling us to start or stop the flow of data
 352  *
 353  */
 354 static void ircomm_ttp_flow_indication(void *instance, void *sap,
 355                                        LOCAL_FLOW cmd)
 356 {
 357         struct ircomm_cb *self = (struct ircomm_cb *) instance;
 358
 359         IRDA_DEBUG(4, "%s()\n", __func__ );
 360
 361         IRDA_ASSERT(self != NULL, return;);
 362         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
 363
 364         if (self->notify.flow_indication)
 365                 self->notify.flow_indication(self->notify.instance, self, cmd);
 366 }
 367
 368