net/irda/ircomm/ircomm_lmp.c

   1 /*********************************************************************
   2  *
   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
  12  *
  13  *     Copyright (c) 1999 Dag Brattli, All Rights Reserved.
  14  *     Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
  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
  19  *     the License, or (at your option) any later version.
  20  *
  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.
  25  *
  26  *     You should have received a copy of the GNU General Public License
  27  *     along with this program; if not, write to the Free Software
  28  *     Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  29  *     MA 02111-1307 USA
  30  *
  31  ********************************************************************/
  32
  33 #include <linux/sched.h>
  34 #include <linux/init.h>
  35
  36 #include <net/irda/irda.h>
  37 #include <net/irda/irlmp.h>
  38 #include <net/irda/iriap.h>
  39 #include <net/irda/irda_device.h>       /* struct irda_skb_cb */
  40
  41 #include <net/irda/ircomm_event.h>
  42 #include <net/irda/ircomm_lmp.h>
  43
  44 /*
  45  * Function ircomm_open_lsap (self)
  46  *
  47  *    Open LSAP. This function will only be used when using "raw" services
  48  *
  49  */
  50 int ircomm_open_lsap(struct ircomm_cb *self)
  51 {
  52         notify_t notify;
  53
  54         IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
  55
  56         /* Register callbacks */
  57         irda_notify_init(&notify);
  58         notify.data_indication       = ircomm_lmp_data_indication;
  59         notify.connect_confirm       = ircomm_lmp_connect_confirm;
  60         notify.connect_indication    = ircomm_lmp_connect_indication;
  61         notify.disconnect_indication = ircomm_lmp_disconnect_indication;
  62         notify.instance = self;
  63         strlcpy(notify.name, "IrCOMM", sizeof(notify.name));
  64
  65         self->lsap = irlmp_open_lsap(LSAP_ANY, &notify, 0);
  66         if (!self->lsap) {
  67                 IRDA_DEBUG(0,"%sfailed to allocate tsap\n", __FUNCTION__ );
  68                 return -1;
  69         }
  70         self->slsap_sel = self->lsap->slsap_sel;
  71
  72         /*
  73          *  Initialize the call-table for issuing commands
  74          */
  75         self->issue.data_request       = ircomm_lmp_data_request;
  76         self->issue.connect_request    = ircomm_lmp_connect_request;
  77         self->issue.connect_response   = ircomm_lmp_connect_response;
  78         self->issue.disconnect_request = ircomm_lmp_disconnect_request;
  79
  80         return 0;
  81 }
  82
  83 /*
  84  * Function ircomm_lmp_connect_request (self, userdata)
  85  *
  86  *
  87  *
  88  */
  89 int ircomm_lmp_connect_request(struct ircomm_cb *self,
  90                                struct sk_buff *userdata,
  91                                struct ircomm_info *info)
  92 {
  93         int ret = 0;
  94
  95         IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
  96
  97         /* Don't forget to refcount it - should be NULL anyway */
  98         if(userdata)
  99                 skb_get(userdata);
 100
 101         ret = irlmp_connect_request(self->lsap, info->dlsap_sel,
 102                                     info->saddr, info->daddr, NULL, userdata);
 103         return ret;
 104 }
 105
 106 /*
 107  * Function ircomm_lmp_connect_response (self, skb)
 108  *
 109  *
 110  *
 111  */
 112 int ircomm_lmp_connect_response(struct ircomm_cb *self, struct sk_buff *userdata)
 113 {
 114         struct sk_buff *tx_skb;
 115         int ret;
 116
 117         IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
 118
 119         /* Any userdata supplied? */
 120         if (userdata == NULL) {
 121                 tx_skb = dev_alloc_skb(64);
 122                 if (!tx_skb)
 123                         return -ENOMEM;
 124
 125                 /* Reserve space for MUX and LAP header */
 126                 skb_reserve(tx_skb, LMP_MAX_HEADER);
 127         } else {
 128                 /*
 129                  *  Check that the client has reserved enough space for
 130                  *  headers
 131                  */
 132                 ASSERT(skb_headroom(userdata) >= LMP_MAX_HEADER, return -1;);
 133
 134                 /* Don't forget to refcount it - should be NULL anyway */
 135                 skb_get(userdata);
 136                 tx_skb = userdata;
 137         }
 138
 139         ret = irlmp_connect_response(self->lsap, tx_skb);
 140
 141         return 0;
 142 }
 143
 144 int ircomm_lmp_disconnect_request(struct ircomm_cb *self,
 145                                   struct sk_buff *userdata,
 146                                   struct ircomm_info *info)
 147 {
 148         struct sk_buff *tx_skb;
 149         int ret;
 150
 151         IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
 152
 153         if (!userdata) {
 154                 tx_skb = dev_alloc_skb(64);
 155                 if (!tx_skb)
 156                         return -ENOMEM;
 157
 158                 /*  Reserve space for MUX and LAP header */
 159                 skb_reserve(tx_skb, LMP_MAX_HEADER);
 160                 userdata = tx_skb;
 161         } else {
 162                 /* Don't forget to refcount it - should be NULL anyway */
 163                 skb_get(userdata);
 164         }
 165
 166         ret = irlmp_disconnect_request(self->lsap, userdata);
 167
 168         return ret;
 169 }
 170
 171 /*
 172  * Function ircomm_lmp_flow_control (skb)
 173  *
 174  *    This function is called when a data frame we have sent to IrLAP has
 175  *    been deallocated. We do this to make sure we don't flood IrLAP with
 176  *    frames, since we are not using the IrTTP flow control mechanism
 177  */
 178 void ircomm_lmp_flow_control(struct sk_buff *skb)
 179 {
 180         struct irda_skb_cb *cb;
 181         struct ircomm_cb *self;
 182         int line;
 183
 184         ASSERT(skb != NULL, return;);
 185
 186         cb = (struct irda_skb_cb *) skb->cb;
 187
 188         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 189
 190         line = cb->line;
 191
 192         self = (struct ircomm_cb *) hashbin_lock_find(ircomm, line, NULL);
 193         if (!self) {
 194                 IRDA_DEBUG(2, "%s(), didn't find myself\n", __FUNCTION__ );
 195                 return;
 196         }
 197
 198         ASSERT(self != NULL, return;);
 199         ASSERT(self->magic == IRCOMM_MAGIC, return;);
 200
 201         self->pkt_count--;
 202
 203         if ((self->pkt_count < 2) && (self->flow_status == FLOW_STOP)) {
 204                 IRDA_DEBUG(2, "%s(), asking TTY to start again!\n", __FUNCTION__ );
 205                 self->flow_status = FLOW_START;
 206                 if (self->notify.flow_indication)
 207                         self->notify.flow_indication(self->notify.instance,
 208                                                      self, FLOW_START);
 209         }
 210 }
 211
 212 /*
 213  * Function ircomm_lmp_data_request (self, userdata)
 214  *
 215  *    Send data frame to peer device
 216  *
 217  */
 218 int ircomm_lmp_data_request(struct ircomm_cb *self, struct sk_buff *skb,
 219                             int not_used)
 220 {
 221         struct irda_skb_cb *cb;
 222         int ret;
 223
 224         ASSERT(skb != NULL, return -1;);
 225
 226         cb = (struct irda_skb_cb *) skb->cb;
 227
 228         cb->line = self->line;
 229
 230         IRDA_DEBUG(4, "%s(), sending frame\n", __FUNCTION__ );
 231
 232         /* Don't forget to refcount it - see ircomm_tty_do_softint() */
 233         skb_get(skb);
 234
 235         skb->destructor = ircomm_lmp_flow_control;
 236
 237         if ((self->pkt_count++ > 7) && (self->flow_status == FLOW_START)) {
 238                 IRDA_DEBUG(2, "%s(), asking TTY to slow down!\n", __FUNCTION__ );
 239                 self->flow_status = FLOW_STOP;
 240                 if (self->notify.flow_indication)
 241                         self->notify.flow_indication(self->notify.instance,
 242                                                      self, FLOW_STOP);
 243         }
 244         ret = irlmp_data_request(self->lsap, skb);
 245         if (ret) {
 246                 ERROR("%s(), failed\n", __FUNCTION__);
 247                 /* irlmp_data_request already free the packet */
 248         }
 249
 250         return ret;
 251 }
 252
 253 /*
 254  * Function ircomm_lmp_data_indication (instance, sap, skb)
 255  *
 256  *    Incoming data which we must deliver to the state machine, to check
 257  *    we are still connected.
 258  */
 259 int ircomm_lmp_data_indication(void *instance, void *sap,
 260                                struct sk_buff *skb)
 261 {
 262         struct ircomm_cb *self = (struct ircomm_cb *) instance;
 263
 264         IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
 265
 266         ASSERT(self != NULL, return -1;);
 267         ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
 268         ASSERT(skb != NULL, return -1;);
 269
 270         ircomm_do_event(self, IRCOMM_LMP_DATA_INDICATION, skb, NULL);
 271
 272         /* Drop reference count - see ircomm_tty_data_indication(). */
 273         dev_kfree_skb(skb);
 274
 275         return 0;
 276 }
 277
 278 /*
 279  * Function ircomm_lmp_connect_confirm (instance, sap, qos, max_sdu_size,
 280  *                                       max_header_size, skb)
 281  *
 282  *    Connection has been confirmed by peer device
 283  *
 284  */
 285 void ircomm_lmp_connect_confirm(void *instance, void *sap,
 286                                 struct qos_info *qos,
 287                                 __u32 max_seg_size,
 288                                 __u8 max_header_size,
 289                                 struct sk_buff *skb)
 290 {
 291         struct ircomm_cb *self = (struct ircomm_cb *) instance;
 292         struct ircomm_info info;
 293
 294         IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
 295
 296         ASSERT(self != NULL, return;);
 297         ASSERT(self->magic == IRCOMM_MAGIC, return;);
 298         ASSERT(skb != NULL, return;);
 299         ASSERT(qos != NULL, return;);
 300
 301         info.max_data_size = max_seg_size;
 302         info.max_header_size = max_header_size;
 303         info.qos = qos;
 304
 305         ircomm_do_event(self, IRCOMM_LMP_CONNECT_CONFIRM, skb, &info);
 306
 307         /* Drop reference count - see ircomm_tty_connect_confirm(). */
 308         dev_kfree_skb(skb);
 309 }
 310
 311 /*
 312  * Function ircomm_lmp_connect_indication (instance, sap, qos, max_sdu_size,
 313  *                                         max_header_size, skb)
 314  *
 315  *    Peer device wants to make a connection with us
 316  *
 317  */
 318 void ircomm_lmp_connect_indication(void *instance, void *sap,
 319                                    struct qos_info *qos,
 320                                    __u32 max_seg_size,
 321                                    __u8 max_header_size,
 322                                    struct sk_buff *skb)
 323 {
 324         struct ircomm_cb *self = (struct ircomm_cb *)instance;
 325         struct ircomm_info info;
 326
 327         IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
 328
 329         ASSERT(self != NULL, return;);
 330         ASSERT(self->magic == IRCOMM_MAGIC, return;);
 331         ASSERT(skb != NULL, return;);
 332         ASSERT(qos != NULL, return;);
 333
 334         info.max_data_size = max_seg_size;
 335         info.max_header_size = max_header_size;
 336         info.qos = qos;
 337
 338         ircomm_do_event(self, IRCOMM_LMP_CONNECT_INDICATION, skb, &info);
 339
 340         /* Drop reference count - see ircomm_tty_connect_indication(). */
 341         dev_kfree_skb(skb);
 342 }
 343
 344 /*
 345  * Function ircomm_lmp_disconnect_indication (instance, sap, reason, skb)
 346  *
 347  *    Peer device has closed the connection, or the link went down for some
 348  *    other reason
 349  */
 350 void ircomm_lmp_disconnect_indication(void *instance, void *sap,
 351                                       LM_REASON reason,
 352                                       struct sk_buff *skb)
 353 {
 354         struct ircomm_cb *self = (struct ircomm_cb *) instance;
 355         struct ircomm_info info;
 356
 357         IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
 358
 359         ASSERT(self != NULL, return;);
 360         ASSERT(self->magic == IRCOMM_MAGIC, return;);
 361
 362         info.reason = reason;
 363
 364         ircomm_do_event(self, IRCOMM_LMP_DISCONNECT_INDICATION, skb, &info);
 365
 366         /* Drop reference count - see ircomm_tty_disconnect_indication(). */
 367         if(skb)
 368                 dev_kfree_skb(skb);
 369 }