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 static int ircomm_ttp_data_indication(void *instance, void *sap,
  44                                       struct sk_buff *skb);
  45 static void ircomm_ttp_connect_confirm(void *instance, void *sap,
  46                                        struct qos_info *qos,
  47                                        __u32 max_sdu_size,
  48                                        __u8 max_header_size,
  49                                        struct sk_buff *skb);
  50 static void ircomm_ttp_connect_indication(void *instance, void *sap,
  51                                           struct qos_info *qos,
  52                                           __u32 max_sdu_size,
  53                                           __u8 max_header_size,
  54                                           struct sk_buff *skb);
  55 static void ircomm_ttp_flow_indication(void *instance, void *sap,
  56                                        LOCAL_FLOW cmd);
  57 static void ircomm_ttp_disconnect_indication(void *instance, void *sap,
  58                                              LM_REASON reason,
  59                                              struct sk_buff *skb);
  60 static int ircomm_ttp_data_request(struct ircomm_cb *self,
  61                                    struct sk_buff *skb,
  62                                    int clen);
  63 static int ircomm_ttp_connect_request(struct ircomm_cb *self,
  64                                       struct sk_buff *userdata,
  65                                       struct ircomm_info *info);
  66 static int ircomm_ttp_connect_response(struct ircomm_cb *self,
  67                                        struct sk_buff *userdata);
  68 static int ircomm_ttp_disconnect_request(struct ircomm_cb *self,
  69                                          struct sk_buff *userdata,
  70                                          struct ircomm_info *info);
  71
  72 /*
  73  * Function ircomm_open_tsap (self)
  74  *
  75  *
  76  *
  77  */
  78 int ircomm_open_tsap(struct ircomm_cb *self)
  79 {
  80         notify_t notify;
  81
  82         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
  83
  84         /* Register callbacks */
  85         irda_notify_init(&notify);
  86         notify.data_indication       = ircomm_ttp_data_indication;
  87         notify.connect_confirm       = ircomm_ttp_connect_confirm;
  88         notify.connect_indication    = ircomm_ttp_connect_indication;
  89         notify.flow_indication       = ircomm_ttp_flow_indication;
  90         notify.disconnect_indication = ircomm_ttp_disconnect_indication;
  91         notify.instance = self;
  92         strlcpy(notify.name, "IrCOMM", sizeof(notify.name));
  93
  94         self->tsap = irttp_open_tsap(LSAP_ANY, DEFAULT_INITIAL_CREDIT,
  95                                      &notify);
  96         if (!self->tsap) {
  97                 IRDA_DEBUG(0, "%sfailed to allocate tsap\n", __FUNCTION__ );
  98                 return -1;
  99         }
 100         self->slsap_sel = self->tsap->stsap_sel;
 101
 102         /*
 103          *  Initialize the call-table for issuing commands
 104          */
 105         self->issue.data_request       = ircomm_ttp_data_request;
 106         self->issue.connect_request    = ircomm_ttp_connect_request;
 107         self->issue.connect_response   = ircomm_ttp_connect_response;
 108         self->issue.disconnect_request = ircomm_ttp_disconnect_request;
 109
 110         return 0;
 111 }
 112
 113 /*
 114  * Function ircomm_ttp_connect_request (self, userdata)
 115  *
 116  *
 117  *
 118  */
 119 static int ircomm_ttp_connect_request(struct ircomm_cb *self,
 120                                       struct sk_buff *userdata,
 121                                       struct ircomm_info *info)
 122 {
 123         int ret = 0;
 124
 125         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
 126
 127         /* Don't forget to refcount it - should be NULL anyway */
 128         if(userdata)
 129                 skb_get(userdata);
 130
 131         ret = irttp_connect_request(self->tsap, info->dlsap_sel,
 132                                     info->saddr, info->daddr, NULL,
 133                                     TTP_SAR_DISABLE, userdata);
 134
 135         return ret;
 136 }
 137
 138 /*
 139  * Function ircomm_ttp_connect_response (self, skb)
 140  *
 141  *
 142  *
 143  */
 144 static int ircomm_ttp_connect_response(struct ircomm_cb *self,
 145                                        struct sk_buff *userdata)
 146 {
 147         int ret;
 148
 149         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
 150
 151         /* Don't forget to refcount it - should be NULL anyway */
 152         if(userdata)
 153                 skb_get(userdata);
 154
 155         ret = irttp_connect_response(self->tsap, TTP_SAR_DISABLE, userdata);
 156
 157         return ret;
 158 }
 159
 160 /*
 161  * Function ircomm_ttp_data_request (self, userdata)
 162  *
 163  *    Send IrCOMM data to IrTTP layer. Currently we do not try to combine
 164  *    control data with pure data, so they will be sent as separate frames.
 165  *    Should not be a big problem though, since control frames are rare. But
 166  *    some of them are sent after connection establishment, so this can
 167  *    increase the latency a bit.
 168  */
 169 static int ircomm_ttp_data_request(struct ircomm_cb *self,
 170                                    struct sk_buff *skb,
 171                                    int clen)
 172 {
 173         int ret;
 174
 175         IRDA_ASSERT(skb != NULL, return -1;);
 176
 177         IRDA_DEBUG(2, "%s(), clen=%d\n", __FUNCTION__ , clen);
 178
 179         /*
 180          * Insert clen field, currently we either send data only, or control
 181          * only frames, to make things easier and avoid queueing
 182          */
 183         IRDA_ASSERT(skb_headroom(skb) >= IRCOMM_HEADER_SIZE, return -1;);
 184
 185         /* Don't forget to refcount it - see ircomm_tty_do_softint() */
 186         skb_get(skb);
 187
 188         skb_push(skb, IRCOMM_HEADER_SIZE);
 189
 190         skb->data[0] = clen;
 191
 192         ret = irttp_data_request(self->tsap, skb);
 193         if (ret) {
 194                 IRDA_ERROR("%s(), failed\n", __FUNCTION__);
 195                 /* irttp_data_request already free the packet */
 196         }
 197
 198         return ret;
 199 }
 200
 201 /*
 202  * Function ircomm_ttp_data_indication (instance, sap, skb)
 203  *
 204  *    Incoming data
 205  *
 206  */
 207 static int ircomm_ttp_data_indication(void *instance, void *sap,
 208                                       struct sk_buff *skb)
 209 {
 210         struct ircomm_cb *self = (struct ircomm_cb *) instance;
 211
 212         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
 213
 214         IRDA_ASSERT(self != NULL, return -1;);
 215         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
 216         IRDA_ASSERT(skb != NULL, return -1;);
 217
 218         ircomm_do_event(self, IRCOMM_TTP_DATA_INDICATION, skb, NULL);
 219
 220         /* Drop reference count - see ircomm_tty_data_indication(). */
 221         dev_kfree_skb(skb);
 222
 223         return 0;
 224 }
 225
 226 static void ircomm_ttp_connect_confirm(void *instance, void *sap,
 227                                        struct qos_info *qos,
 228                                        __u32 max_sdu_size,
 229                                        __u8 max_header_size,
 230                                        struct sk_buff *skb)
 231 {
 232         struct ircomm_cb *self = (struct ircomm_cb *) instance;
 233         struct ircomm_info info;
 234
 235         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
 236
 237         IRDA_ASSERT(self != NULL, return;);
 238         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
 239         IRDA_ASSERT(skb != NULL, return;);
 240         IRDA_ASSERT(qos != NULL, goto out;);
 241
 242         if (max_sdu_size != TTP_SAR_DISABLE) {
 243                 IRDA_ERROR("%s(), SAR not allowed for IrCOMM!\n",
 244                            __FUNCTION__);
 245                 goto out;
 246         }
 247
 248         info.max_data_size = irttp_get_max_seg_size(self->tsap)
 249                 - IRCOMM_HEADER_SIZE;
 250         info.max_header_size = max_header_size + IRCOMM_HEADER_SIZE;
 251         info.qos = qos;
 252
 253         ircomm_do_event(self, IRCOMM_TTP_CONNECT_CONFIRM, skb, &info);
 254
 255 out:
 256         /* Drop reference count - see ircomm_tty_connect_confirm(). */
 257         dev_kfree_skb(skb);
 258 }
 259
 260 /*
 261  * Function ircomm_ttp_connect_indication (instance, sap, qos, max_sdu_size,
 262  *                                         max_header_size, skb)
 263  *
 264  *
 265  *
 266  */
 267 static void ircomm_ttp_connect_indication(void *instance, void *sap,
 268                                           struct qos_info *qos,
 269                                           __u32 max_sdu_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
 276         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
 277
 278         IRDA_ASSERT(self != NULL, return;);
 279         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
 280         IRDA_ASSERT(skb != NULL, return;);
 281         IRDA_ASSERT(qos != NULL, goto out;);
 282
 283         if (max_sdu_size != TTP_SAR_DISABLE) {
 284                 IRDA_ERROR("%s(), SAR not allowed for IrCOMM!\n",
 285                            __FUNCTION__);
 286                 goto out;
 287         }
 288
 289         info.max_data_size = irttp_get_max_seg_size(self->tsap)
 290                 - IRCOMM_HEADER_SIZE;
 291         info.max_header_size = max_header_size + IRCOMM_HEADER_SIZE;
 292         info.qos = qos;
 293
 294         ircomm_do_event(self, IRCOMM_TTP_CONNECT_INDICATION, skb, &info);
 295
 296 out:
 297         /* Drop reference count - see ircomm_tty_connect_indication(). */
 298         dev_kfree_skb(skb);
 299 }
 300
 301 /*
 302  * Function ircomm_ttp_disconnect_request (self, userdata, info)
 303  *
 304  *
 305  *
 306  */
 307 static int ircomm_ttp_disconnect_request(struct ircomm_cb *self,
 308                                          struct sk_buff *userdata,
 309                                          struct ircomm_info *info)
 310 {
 311         int ret;
 312
 313         /* Don't forget to refcount it - should be NULL anyway */
 314         if(userdata)
 315                 skb_get(userdata);
 316
 317         ret = irttp_disconnect_request(self->tsap, userdata, P_NORMAL);
 318
 319         return ret;
 320 }
 321
 322 /*
 323  * Function ircomm_ttp_disconnect_indication (instance, sap, reason, skb)
 324  *
 325  *
 326  *
 327  */
 328 static void ircomm_ttp_disconnect_indication(void *instance, void *sap,
 329                                              LM_REASON reason,
 330                                              struct sk_buff *skb)
 331 {
 332         struct ircomm_cb *self = (struct ircomm_cb *) instance;
 333         struct ircomm_info info;
 334
 335         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 336
 337         IRDA_ASSERT(self != NULL, return;);
 338         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
 339
 340         info.reason = reason;
 341
 342         ircomm_do_event(self, IRCOMM_TTP_DISCONNECT_INDICATION, skb, &info);
 343
 344         /* Drop reference count - see ircomm_tty_disconnect_indication(). */
 345         if(skb)
 346                 dev_kfree_skb(skb);
 347 }
 348
 349 /*
 350  * Function ircomm_ttp_flow_indication (instance, sap, cmd)
 351  *
 352  *    Layer below is telling us to start or stop the flow of data
 353  *
 354  */
 355 static void ircomm_ttp_flow_indication(void *instance, void *sap,
 356                                        LOCAL_FLOW cmd)
 357 {
 358         struct ircomm_cb *self = (struct ircomm_cb *) instance;
 359
 360         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
 361
 362         IRDA_ASSERT(self != NULL, return;);
 363         IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
 364
 365         if (self->notify.flow_indication)
 366                 self->notify.flow_indication(self->notify.instance, self, cmd);
 367 }
 368
 369