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, see <http://www.gnu.org/licenses/>.
  27  *
  28  ********************************************************************/
  29
  30 #include <linux/init.h>
  31
  32 #include <net/irda/irda.h>
  33 #include <net/irda/irlmp.h>
  34 #include <net/irda/iriap.h>
  35 #include <net/irda/irttp.h>
  36
  37 #include <net/irda/ircomm_event.h>
  38 #include <net/irda/ircomm_ttp.h>
  39
  40 static int ircomm_ttp_data_indication(void *instance, void *sap,
  41                                       struct sk_buff *skb);
  42 static void ircomm_ttp_connect_confirm(void *instance, void *sap,
  43                                        struct qos_info *qos,
  44                                        __u32 max_sdu_size,
  45                                        __u8 max_header_size,
  46                                        struct sk_buff *skb);
  47 static void ircomm_ttp_connect_indication(void *instance, void *sap,
  48                                           struct qos_info *qos,
  49                                           __u32 max_sdu_size,
  50                                           __u8 max_header_size,
  51                                           struct sk_buff *skb);
  52 static void ircomm_ttp_flow_indication(void *instance, void *sap,
  53                                        LOCAL_FLOW cmd);
  54 static void ircomm_ttp_disconnect_indication(void *instance, void *sap,
  55                                              LM_REASON reason,
  56                                              struct sk_buff *skb);
  57 static int ircomm_ttp_data_request(struct ircomm_cb *self,
  58                                    struct sk_buff *skb,
  59                                    int clen);
  60 static int ircomm_ttp_connect_request(struct ircomm_cb *self,
  61                                       struct sk_buff *userdata,
  62                                       struct ircomm_info *info);
  63 static int ircomm_ttp_connect_response(struct ircomm_cb *self,
  64                                        struct sk_buff *userdata);
  65 static int ircomm_ttp_disconnect_request(struct ircomm_cb *self,
  66                                          struct sk_buff *userdata,
  67                                          struct ircomm_info *info);
  68
  69 /*
  70  * Function ircomm_open_tsap (self)
  71  *
  72  *
  73  *
  74  */
  75 int ircomm_open_tsap(struct ircomm_cb *self)
  76 {
  77         notify_t notify;
  78
  79         IRDA_DEBUG(4, "%s()\n", __func__ );
  80
  81         /* Register callbacks */
  82         irda_notify_init(&notify);
  83         notify.data_indication       = ircomm_ttp_data_indication;
  84         notify.connect_confirm       = ircomm_ttp_connect_confirm;
  85         notify.connect_indication    = ircomm_ttp_connect_indication;
  86         notify.flow_indication       = ircomm_ttp_flow_indication;
  87         notify.disconnect_indication = ircomm_ttp_disconnect_indication;
  88         notify.instance = self;
  89         strlcpy(notify.name, "IrCOMM", sizeof(notify.name));
  90
  91         self->tsap = irttp_open_tsap(LSAP_ANY, DEFAULT_INITIAL_CREDIT,
  92                                      &notify);
  93         if (!self->tsap) {
  94                 IRDA_DEBUG(0, "%sfailed to allocate tsap\n", __func__ );
  95                 return -1;
  96         }
  97         self->slsap_sel = self->tsap->stsap_sel;
  98
  99         /*
 100          *  Initialize the call-table for issuing commands
 101          */
 102         self->issue.data_request       = ircomm_ttp_data_request;
 103         self->issue.connect_request    = ircomm_ttp_connect_request;
 104         self->issue.connect_response   = ircomm_ttp_connect_response;
 105         self->issue.disconnect_request = ircomm_ttp_disconnect_request;
 106
 107         return 0;
 108 }
 109
 110 /*
 111  * Function ircomm_ttp_connect_request (self, userdata)
 112  *
 113  *
 114  *
 115  */
 116 static int ircomm_ttp_connect_request(struct ircomm_cb *self,
 117                                       struct sk_buff *userdata,
 118                                       struct ircomm_info *info)
 119 {
 120         int ret = 0;
 121
 122         IRDA_DEBUG(4, "%s()\n", __func__ );
 123
 124         /* Don't forget to refcount it - should be NULL anyway */
 125         if(userdata)
 126                 skb_get(userdata);
 127
 128         ret = irttp_connect_request(self->tsap, info->dlsap_sel,
 129                                     info->saddr, info->daddr, NULL,
 130                                     TTP_SAR_DISABLE, userdata);
 131
 132         return ret;
 133 }
 134
 135 /*
 136  * Function ircomm_ttp_connect_response (self, skb)
 137  *
 138  *
 139  *
 140  */
 141 static int ircomm_ttp_connect_response(struct ircomm_cb *self,
 142                                        struct sk_buff *userdata)
 143 {
 144         int ret;
 145
 146         IRDA_DEBUG(4, "%s()\n", __func__ );
 147
 148         /* Don't forget to refcount it - should be NULL anyway */
 149         if(userdata)
 150                 skb_get(userdata);
 151
 152         ret = irttp_connect_response(self->tsap, TTP_SAR_DISABLE, userdata);
 153
 154         return ret;
 155 }
 156
 157 /*
 158  * Function ircomm_ttp_data_request (self, userdata)
 159  *
 160  *    Send IrCOMM data to IrTTP layer. Currently we do not try to combine
 161  *    control data with pure data, so they will be sent as separate frames.
 162  *    Should not be a big problem though, since control frames are rare. But
 163  *    some of them are sent after connection establishment, so this can
 164  *    increase the latency a bit.
 165  */
 166 static int ircomm_ttp_data_request(struct ircomm_cb *self,
 167                                    struct sk_buff *skb,
 168                                    int clen)
 169 {
 170         int ret;
 171
 172         IRDA_ASSERT(skb != NULL, return -1;);
 173
 174         IRDA_DEBUG(2, "%s(), clen=%d\n", __func__ , clen);
 175
 176         /*
 177          * Insert clen field, currently we either send data only, or control
 178          * only frames, to make things easier and avoid queueing
 179          */
 180         IRDA_ASSERT(skb_headroom(skb) >= IRCOMM_HEADER_SIZE, return -1;);
 181
 182         /* Don't forget to refcount it - see ircomm_tty_do_softint() */
 183         skb_get(skb);
 184
 185         skb_push(skb, IRCOMM_HEADER_SIZE);
 186
 187         skb->data[0] = clen;
 188
 189         ret = irttp_data_request(self->tsap, skb);
 190         if (ret) {
 191                 IRDA_ERROR("%s(), failed\n", __func__);
 192                 /* irttp_data_request already free the packet */
 193         }
 194
 195         return ret;
 196 }
 197
 198 /*
 199  * Function ircomm_ttp_data_indication (instance, sap, skb)
 200  *
 201  *    Incoming data
 202  *
 203  */
 204 static int ircomm_ttp_data_indication(void *instance, void *sap,
 205                                       struct sk_buff *skb)
 206 {
 207         struct ircomm_cb *self = (struct ircomm_cb *) instance;
 208
 209         IRDA_DEBUG(4, "%s()\n", __func__ );
 210
 211         IRDA_ASSERT(self != NULL, return -1;);
 212         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
 213         IRDA_ASSERT(skb != NULL, return -1;);
 214
 215         ircomm_do_event(self, IRCOMM_TTP_DATA_INDICATION, skb, NULL);
 216
 217         /* Drop reference count - see ircomm_tty_data_indication(). */
 218         dev_kfree_skb(skb);
 219
 220         return 0;
 221 }
 222
 223 static void ircomm_ttp_connect_confirm(void *instance, void *sap,
 224                                        struct qos_info *qos,
 225                                        __u32 max_sdu_size,
 226                                        __u8 max_header_size,
 227                                        struct sk_buff *skb)
 228 {
 229         struct ircomm_cb *self = (struct ircomm_cb *) instance;
 230         struct ircomm_info info;
 231
 232         IRDA_DEBUG(4, "%s()\n", __func__ );
 233
 234         IRDA_ASSERT(self != NULL, return;);
 235         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
 236         IRDA_ASSERT(skb != NULL, return;);
 237         IRDA_ASSERT(qos != NULL, goto out;);
 238
 239         if (max_sdu_size != TTP_SAR_DISABLE) {
 240                 IRDA_ERROR("%s(), SAR not allowed for IrCOMM!\n",
 241                            __func__);
 242                 goto out;
 243         }
 244
 245         info.max_data_size = irttp_get_max_seg_size(self->tsap)
 246                 - IRCOMM_HEADER_SIZE;
 247         info.max_header_size = max_header_size + IRCOMM_HEADER_SIZE;
 248         info.qos = qos;
 249
 250         ircomm_do_event(self, IRCOMM_TTP_CONNECT_CONFIRM, skb, &info);
 251
 252 out:
 253         /* Drop reference count - see ircomm_tty_connect_confirm(). */
 254         dev_kfree_skb(skb);
 255 }
 256
 257 /*
 258  * Function ircomm_ttp_connect_indication (instance, sap, qos, max_sdu_size,
 259  *                                         max_header_size, skb)
 260  *
 261  *
 262  *
 263  */
 264 static void ircomm_ttp_connect_indication(void *instance, void *sap,
 265                                           struct qos_info *qos,
 266                                           __u32 max_sdu_size,
 267                                           __u8 max_header_size,
 268                                           struct sk_buff *skb)
 269 {
 270         struct ircomm_cb *self = (struct ircomm_cb *)instance;
 271         struct ircomm_info info;
 272
 273         IRDA_DEBUG(4, "%s()\n", __func__ );
 274
 275         IRDA_ASSERT(self != NULL, return;);
 276         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
 277         IRDA_ASSERT(skb != NULL, return;);
 278         IRDA_ASSERT(qos != NULL, goto out;);
 279
 280         if (max_sdu_size != TTP_SAR_DISABLE) {
 281                 IRDA_ERROR("%s(), SAR not allowed for IrCOMM!\n",
 282                            __func__);
 283                 goto out;
 284         }
 285
 286         info.max_data_size = irttp_get_max_seg_size(self->tsap)
 287                 - IRCOMM_HEADER_SIZE;
 288         info.max_header_size = max_header_size + IRCOMM_HEADER_SIZE;
 289         info.qos = qos;
 290
 291         ircomm_do_event(self, IRCOMM_TTP_CONNECT_INDICATION, skb, &info);
 292
 293 out:
 294         /* Drop reference count - see ircomm_tty_connect_indication(). */
 295         dev_kfree_skb(skb);
 296 }
 297
 298 /*
 299  * Function ircomm_ttp_disconnect_request (self, userdata, info)
 300  *
 301  *
 302  *
 303  */
 304 static int ircomm_ttp_disconnect_request(struct ircomm_cb *self,
 305                                          struct sk_buff *userdata,
 306                                          struct ircomm_info *info)
 307 {
 308         int ret;
 309
 310         /* Don't forget to refcount it - should be NULL anyway */
 311         if(userdata)
 312                 skb_get(userdata);
 313
 314         ret = irttp_disconnect_request(self->tsap, userdata, P_NORMAL);
 315
 316         return ret;
 317 }
 318
 319 /*
 320  * Function ircomm_ttp_disconnect_indication (instance, sap, reason, skb)
 321  *
 322  *
 323  *
 324  */
 325 static void ircomm_ttp_disconnect_indication(void *instance, void *sap,
 326                                              LM_REASON reason,
 327                                              struct sk_buff *skb)
 328 {
 329         struct ircomm_cb *self = (struct ircomm_cb *) instance;
 330         struct ircomm_info info;
 331
 332         IRDA_DEBUG(2, "%s()\n", __func__ );
 333
 334         IRDA_ASSERT(self != NULL, return;);
 335         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
 336
 337         info.reason = reason;
 338
 339         ircomm_do_event(self, IRCOMM_TTP_DISCONNECT_INDICATION, skb, &info);
 340
 341         /* Drop reference count - see ircomm_tty_disconnect_indication(). */
 342         if(skb)
 343                 dev_kfree_skb(skb);
 344 }
 345
 346 /*
 347  * Function ircomm_ttp_flow_indication (instance, sap, cmd)
 348  *
 349  *    Layer below is telling us to start or stop the flow of data
 350  *
 351  */
 352 static void ircomm_ttp_flow_indication(void *instance, void *sap,
 353                                        LOCAL_FLOW cmd)
 354 {
 355         struct ircomm_cb *self = (struct ircomm_cb *) instance;
 356
 357         IRDA_DEBUG(4, "%s()\n", __func__ );
 358
 359         IRDA_ASSERT(self != NULL, return;);
 360         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
 361
 362         if (self->notify.flow_indication)
 363                 self->notify.flow_indication(self->notify.instance, self, cmd);
 364 }
 365
 366