net/irda/irlan/irlan_provider.c

   1 /*********************************************************************
   2  *
   3  * Filename:      irlan_provider.c
   4  * Version:       0.9
   5  * Description:   IrDA LAN Access Protocol Implementation
   6  * Status:        Experimental.
   7  * Author:        Dag Brattli <dagb@cs.uit.no>
   8  * Created at:    Sun Aug 31 20:14:37 1997
   9  * Modified at:   Sat Oct 30 12:52:10 1999
  10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11  * Sources:       skeleton.c by Donald Becker <becker@CESDIS.gsfc.nasa.gov>
  12  *                slip.c by Laurence Culhane,   <loz@holmes.demon.co.uk>
  13  *                          Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
  14  *
  15  *     Copyright (c) 1998-1999 Dag Brattli <dagb@cs.uit.no>,
  16  *     All Rights Reserved.
  17  *
  18  *     This program is free software; you can redistribute it and/or
  19  *     modify it under the terms of the GNU General Public License as
  20  *     published by the Free Software Foundation; either version 2 of
  21  *     the License, or (at your option) any later version.
  22  *
  23  *     Neither Dag Brattli nor University of Tromsø admit liability nor
  24  *     provide warranty for any of this software. This material is
  25  *     provided "AS-IS" and at no charge.
  26  *
  27  ********************************************************************/
  28
  29 #include <linux/kernel.h>
  30 #include <linux/string.h>
  31 #include <linux/errno.h>
  32 #include <linux/netdevice.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/init.h>
  35 #include <linux/random.h>
  36 #include <linux/bitops.h>
  37
  38 #include <asm/system.h>
  39 #include <asm/byteorder.h>
  40
  41 #include <net/irda/irda.h>
  42 #include <net/irda/irttp.h>
  43 #include <net/irda/irlmp.h>
  44 #include <net/irda/irias_object.h>
  45 #include <net/irda/iriap.h>
  46 #include <net/irda/timer.h>
  47
  48 #include <net/irda/irlan_common.h>
  49 #include <net/irda/irlan_eth.h>
  50 #include <net/irda/irlan_event.h>
  51 #include <net/irda/irlan_provider.h>
  52 #include <net/irda/irlan_filter.h>
  53 #include <net/irda/irlan_client.h>
  54
  55 static void irlan_provider_connect_indication(void *instance, void *sap,
  56                                               struct qos_info *qos,
  57                                               __u32 max_sdu_size,
  58                                               __u8 max_header_size,
  59                                               struct sk_buff *skb);
  60
  61 /*
  62  * Function irlan_provider_control_data_indication (handle, skb)
  63  *
  64  *    This function gets the data that is received on the control channel
  65  *
  66  */
  67 static int irlan_provider_data_indication(void *instance, void *sap,
  68                                           struct sk_buff *skb)
  69 {
  70         struct irlan_cb *self;
  71         __u8 code;
  72
  73         IRDA_DEBUG(4, "%s()\n", __func__ );
  74
  75         self = (struct irlan_cb *) instance;
  76
  77         IRDA_ASSERT(self != NULL, return -1;);
  78         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return -1;);
  79
  80         IRDA_ASSERT(skb != NULL, return -1;);
  81
  82         code = skb->data[0];
  83         switch(code) {
  84         case CMD_GET_PROVIDER_INFO:
  85                 IRDA_DEBUG(4, "Got GET_PROVIDER_INFO command!\n");
  86                 irlan_do_provider_event(self, IRLAN_GET_INFO_CMD, skb);
  87                 break;
  88
  89         case CMD_GET_MEDIA_CHAR:
  90                 IRDA_DEBUG(4, "Got GET_MEDIA_CHAR command!\n");
  91                 irlan_do_provider_event(self, IRLAN_GET_MEDIA_CMD, skb);
  92                 break;
  93         case CMD_OPEN_DATA_CHANNEL:
  94                 IRDA_DEBUG(4, "Got OPEN_DATA_CHANNEL command!\n");
  95                 irlan_do_provider_event(self, IRLAN_OPEN_DATA_CMD, skb);
  96                 break;
  97         case CMD_FILTER_OPERATION:
  98                 IRDA_DEBUG(4, "Got FILTER_OPERATION command!\n");
  99                 irlan_do_provider_event(self, IRLAN_FILTER_CONFIG_CMD, skb);
 100                 break;
 101         case CMD_RECONNECT_DATA_CHAN:
 102                 IRDA_DEBUG(2, "%s(), Got RECONNECT_DATA_CHAN command\n", __func__ );
 103                 IRDA_DEBUG(2, "%s(), NOT IMPLEMENTED\n", __func__ );
 104                 break;
 105         case CMD_CLOSE_DATA_CHAN:
 106                 IRDA_DEBUG(2, "Got CLOSE_DATA_CHAN command!\n");
 107                 IRDA_DEBUG(2, "%s(), NOT IMPLEMENTED\n", __func__ );
 108                 break;
 109         default:
 110                 IRDA_DEBUG(2, "%s(), Unknown command!\n", __func__ );
 111                 break;
 112         }
 113         return 0;
 114 }
 115
 116 /*
 117  * Function irlan_provider_connect_indication (handle, skb, priv)
 118  *
 119  *    Got connection from peer IrLAN client
 120  *
 121  */
 122 static void irlan_provider_connect_indication(void *instance, void *sap,
 123                                               struct qos_info *qos,
 124                                               __u32 max_sdu_size,
 125                                               __u8 max_header_size,
 126                                               struct sk_buff *skb)
 127 {
 128         struct irlan_cb *self;
 129         struct tsap_cb *tsap;
 130         __u32 saddr, daddr;
 131
 132         IRDA_DEBUG(0, "%s()\n", __func__ );
 133
 134         self = (struct irlan_cb *) instance;
 135         tsap = (struct tsap_cb *) sap;
 136
 137         IRDA_ASSERT(self != NULL, return;);
 138         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 139
 140         IRDA_ASSERT(tsap == self->provider.tsap_ctrl,return;);
 141         IRDA_ASSERT(self->provider.state == IRLAN_IDLE, return;);
 142
 143         daddr = irttp_get_daddr(tsap);
 144         saddr = irttp_get_saddr(tsap);
 145         self->provider.max_sdu_size = max_sdu_size;
 146         self->provider.max_header_size = max_header_size;
 147
 148         irlan_do_provider_event(self, IRLAN_CONNECT_INDICATION, NULL);
 149
 150         /*
 151          * If we are in peer mode, the client may not have got the discovery
 152          * indication it needs to make progress. If the client is still in
 153          * IDLE state, we must kick it.
 154          */
 155         if ((self->provider.access_type == ACCESS_PEER) &&
 156             (self->client.state == IRLAN_IDLE))
 157         {
 158                 irlan_client_wakeup(self, self->saddr, self->daddr);
 159         }
 160 }
 161
 162 /*
 163  * Function irlan_provider_connect_response (handle)
 164  *
 165  *    Accept incoming connection
 166  *
 167  */
 168 void irlan_provider_connect_response(struct irlan_cb *self,
 169                                      struct tsap_cb *tsap)
 170 {
 171         IRDA_ASSERT(self != NULL, return;);
 172         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 173
 174         /* Just accept */
 175         irttp_connect_response(tsap, IRLAN_MTU, NULL);
 176 }
 177
 178 static void irlan_provider_disconnect_indication(void *instance, void *sap,
 179                                                  LM_REASON reason,
 180                                                  struct sk_buff *userdata)
 181 {
 182         struct irlan_cb *self;
 183         struct tsap_cb *tsap;
 184
 185         IRDA_DEBUG(4, "%s(), reason=%d\n", __func__ , reason);
 186
 187         self = (struct irlan_cb *) instance;
 188         tsap = (struct tsap_cb *) sap;
 189
 190         IRDA_ASSERT(self != NULL, return;);
 191         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 192         IRDA_ASSERT(tsap != NULL, return;);
 193         IRDA_ASSERT(tsap->magic == TTP_TSAP_MAGIC, return;);
 194
 195         IRDA_ASSERT(tsap == self->provider.tsap_ctrl, return;);
 196
 197         irlan_do_provider_event(self, IRLAN_LMP_DISCONNECT, NULL);
 198 }
 199
 200 /*
 201  * Function irlan_parse_open_data_cmd (self, skb)
 202  *
 203  *
 204  *
 205  */
 206 int irlan_parse_open_data_cmd(struct irlan_cb *self, struct sk_buff *skb)
 207 {
 208         int ret;
 209
 210         ret = irlan_provider_parse_command(self, CMD_OPEN_DATA_CHANNEL, skb);
 211
 212         /* Open data channel */
 213         irlan_open_data_tsap(self);
 214
 215         return ret;
 216 }
 217
 218 /*
 219  * Function parse_command (skb)
 220  *
 221  *    Extract all parameters from received buffer, then feed them to
 222  *    check_params for parsing
 223  *
 224  */
 225 int irlan_provider_parse_command(struct irlan_cb *self, int cmd,
 226                                  struct sk_buff *skb)
 227 {
 228         __u8 *frame;
 229         __u8 *ptr;
 230         int count;
 231         __u16 val_len;
 232         int i;
 233         char *name;
 234         char *value;
 235         int ret = RSP_SUCCESS;
 236
 237         IRDA_ASSERT(skb != NULL, return -RSP_PROTOCOL_ERROR;);
 238
 239         IRDA_DEBUG(4, "%s(), skb->len=%d\n", __func__ , (int)skb->len);
 240
 241         IRDA_ASSERT(self != NULL, return -RSP_PROTOCOL_ERROR;);
 242         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return -RSP_PROTOCOL_ERROR;);
 243
 244         if (!skb)
 245                 return -RSP_PROTOCOL_ERROR;
 246
 247         frame = skb->data;
 248
 249         name = kmalloc(255, GFP_ATOMIC);
 250         if (!name)
 251                 return -RSP_INSUFFICIENT_RESOURCES;
 252         value = kmalloc(1016, GFP_ATOMIC);
 253         if (!value) {
 254                 kfree(name);
 255                 return -RSP_INSUFFICIENT_RESOURCES;
 256         }
 257
 258         /* How many parameters? */
 259         count = frame[1];
 260
 261         IRDA_DEBUG(4, "Got %d parameters\n", count);
 262
 263         ptr = frame+2;
 264
 265         /* For all parameters */
 266         for (i=0; i<count;i++) {
 267                 ret = irlan_extract_param(ptr, name, value, &val_len);
 268                 if (ret < 0) {
 269                         IRDA_DEBUG(2, "%s(), IrLAN, Error!\n", __func__ );
 270                         break;
 271                 }
 272                 ptr+=ret;
 273                 ret = RSP_SUCCESS;
 274                 irlan_check_command_param(self, name, value);
 275         }
 276         /* Cleanup */
 277         kfree(name);
 278         kfree(value);
 279
 280         return ret;
 281 }
 282
 283 /*
 284  * Function irlan_provider_send_reply (self, info)
 285  *
 286  *    Send reply to query to peer IrLAN layer
 287  *
 288  */
 289 void irlan_provider_send_reply(struct irlan_cb *self, int command,
 290                                int ret_code)
 291 {
 292         struct sk_buff *skb;
 293
 294         IRDA_DEBUG(4, "%s()\n", __func__ );
 295
 296         IRDA_ASSERT(self != NULL, return;);
 297         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 298
 299         skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
 300                         /* Bigger param length comes from CMD_GET_MEDIA_CHAR */
 301                         IRLAN_STRING_PARAMETER_LEN("FILTER_TYPE", "DIRECTED") +
 302                         IRLAN_STRING_PARAMETER_LEN("FILTER_TYPE", "BORADCAST") +
 303                         IRLAN_STRING_PARAMETER_LEN("FILTER_TYPE", "MULTICAST") +
 304                         IRLAN_STRING_PARAMETER_LEN("ACCESS_TYPE", "HOSTED"),
 305                         GFP_ATOMIC);
 306
 307         if (!skb)
 308                 return;
 309
 310         /* Reserve space for TTP, LMP, and LAP header */
 311         skb_reserve(skb, self->provider.max_header_size);
 312         skb_put(skb, 2);
 313
 314         switch (command) {
 315         case CMD_GET_PROVIDER_INFO:
 316                 skb->data[0] = 0x00; /* Success */
 317                 skb->data[1] = 0x02; /* 2 parameters */
 318                 switch (self->media) {
 319                 case MEDIA_802_3:
 320                         irlan_insert_string_param(skb, "MEDIA", "802.3");
 321                         break;
 322                 case MEDIA_802_5:
 323                         irlan_insert_string_param(skb, "MEDIA", "802.5");
 324                         break;
 325                 default:
 326                         IRDA_DEBUG(2, "%s(), unknown media type!\n", __func__ );
 327                         break;
 328                 }
 329                 irlan_insert_short_param(skb, "IRLAN_VER", 0x0101);
 330                 break;
 331
 332         case CMD_GET_MEDIA_CHAR:
 333                 skb->data[0] = 0x00; /* Success */
 334                 skb->data[1] = 0x05; /* 5 parameters */
 335                 irlan_insert_string_param(skb, "FILTER_TYPE", "DIRECTED");
 336                 irlan_insert_string_param(skb, "FILTER_TYPE", "BROADCAST");
 337                 irlan_insert_string_param(skb, "FILTER_TYPE", "MULTICAST");
 338
 339                 switch (self->provider.access_type) {
 340                 case ACCESS_DIRECT:
 341                         irlan_insert_string_param(skb, "ACCESS_TYPE", "DIRECT");
 342                         break;
 343                 case ACCESS_PEER:
 344                         irlan_insert_string_param(skb, "ACCESS_TYPE", "PEER");
 345                         break;
 346                 case ACCESS_HOSTED:
 347                         irlan_insert_string_param(skb, "ACCESS_TYPE", "HOSTED");
 348                         break;
 349                 default:
 350                         IRDA_DEBUG(2, "%s(), Unknown access type\n", __func__ );
 351                         break;
 352                 }
 353                 irlan_insert_short_param(skb, "MAX_FRAME", 0x05ee);
 354                 break;
 355         case CMD_OPEN_DATA_CHANNEL:
 356                 skb->data[0] = 0x00; /* Success */
 357                 if (self->provider.send_arb_val) {
 358                         skb->data[1] = 0x03; /* 3 parameters */
 359                         irlan_insert_short_param(skb, "CON_ARB",
 360                                                  self->provider.send_arb_val);
 361                 } else
 362                         skb->data[1] = 0x02; /* 2 parameters */
 363                 irlan_insert_byte_param(skb, "DATA_CHAN", self->stsap_sel_data);
 364                 irlan_insert_string_param(skb, "RECONNECT_KEY", "LINUX RULES!");
 365                 break;
 366         case CMD_FILTER_OPERATION:
 367                 irlan_filter_request(self, skb);
 368                 break;
 369         default:
 370                 IRDA_DEBUG(2, "%s(), Unknown command!\n", __func__ );
 371                 break;
 372         }
 373
 374         irttp_data_request(self->provider.tsap_ctrl, skb);
 375 }
 376
 377 /*
 378  * Function irlan_provider_register(void)
 379  *
 380  *    Register provider support so we can accept incoming connections.
 381  *
 382  */
 383 int irlan_provider_open_ctrl_tsap(struct irlan_cb *self)
 384 {
 385         struct tsap_cb *tsap;
 386         notify_t notify;
 387
 388         IRDA_DEBUG(4, "%s()\n", __func__ );
 389
 390         IRDA_ASSERT(self != NULL, return -1;);
 391         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return -1;);
 392
 393         /* Check if already open */
 394         if (self->provider.tsap_ctrl)
 395                 return -1;
 396
 397         /*
 398          *  First register well known control TSAP
 399          */
 400         irda_notify_init(&notify);
 401         notify.data_indication       = irlan_provider_data_indication;
 402         notify.connect_indication    = irlan_provider_connect_indication;
 403         notify.disconnect_indication = irlan_provider_disconnect_indication;
 404         notify.instance = self;
 405         strlcpy(notify.name, "IrLAN ctrl (p)", sizeof(notify.name));
 406
 407         tsap = irttp_open_tsap(LSAP_ANY, 1, &notify);
 408         if (!tsap) {
 409                 IRDA_DEBUG(2, "%s(), Got no tsap!\n", __func__ );
 410                 return -1;
 411         }
 412         self->provider.tsap_ctrl = tsap;
 413
 414         /* Register with LM-IAS */
 415         irlan_ias_register(self, tsap->stsap_sel);
 416
 417         return 0;
 418 }
 419