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 #include <linux/slab.h>
  38
  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 = 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
 131         IRDA_DEBUG(0, "%s()\n", __func__ );
 132
 133         self = instance;
 134         tsap = sap;
 135
 136         IRDA_ASSERT(self != NULL, return;);
 137         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 138
 139         IRDA_ASSERT(tsap == self->provider.tsap_ctrl,return;);
 140         IRDA_ASSERT(self->provider.state == IRLAN_IDLE, return;);
 141
 142         self->provider.max_sdu_size = max_sdu_size;
 143         self->provider.max_header_size = max_header_size;
 144
 145         irlan_do_provider_event(self, IRLAN_CONNECT_INDICATION, NULL);
 146
 147         /*
 148          * If we are in peer mode, the client may not have got the discovery
 149          * indication it needs to make progress. If the client is still in
 150          * IDLE state, we must kick it.
 151          */
 152         if ((self->provider.access_type == ACCESS_PEER) &&
 153             (self->client.state == IRLAN_IDLE))
 154         {
 155                 irlan_client_wakeup(self, self->saddr, self->daddr);
 156         }
 157 }
 158
 159 /*
 160  * Function irlan_provider_connect_response (handle)
 161  *
 162  *    Accept incoming connection
 163  *
 164  */
 165 void irlan_provider_connect_response(struct irlan_cb *self,
 166                                      struct tsap_cb *tsap)
 167 {
 168         IRDA_ASSERT(self != NULL, return;);
 169         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 170
 171         /* Just accept */
 172         irttp_connect_response(tsap, IRLAN_MTU, NULL);
 173 }
 174
 175 static void irlan_provider_disconnect_indication(void *instance, void *sap,
 176                                                  LM_REASON reason,
 177                                                  struct sk_buff *userdata)
 178 {
 179         struct irlan_cb *self;
 180         struct tsap_cb *tsap;
 181
 182         IRDA_DEBUG(4, "%s(), reason=%d\n", __func__ , reason);
 183
 184         self = instance;
 185         tsap = sap;
 186
 187         IRDA_ASSERT(self != NULL, return;);
 188         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 189         IRDA_ASSERT(tsap != NULL, return;);
 190         IRDA_ASSERT(tsap->magic == TTP_TSAP_MAGIC, return;);
 191
 192         IRDA_ASSERT(tsap == self->provider.tsap_ctrl, return;);
 193
 194         irlan_do_provider_event(self, IRLAN_LMP_DISCONNECT, NULL);
 195 }
 196
 197 /*
 198  * Function irlan_parse_open_data_cmd (self, skb)
 199  *
 200  *
 201  *
 202  */
 203 int irlan_parse_open_data_cmd(struct irlan_cb *self, struct sk_buff *skb)
 204 {
 205         int ret;
 206
 207         ret = irlan_provider_parse_command(self, CMD_OPEN_DATA_CHANNEL, skb);
 208
 209         /* Open data channel */
 210         irlan_open_data_tsap(self);
 211
 212         return ret;
 213 }
 214
 215 /*
 216  * Function parse_command (skb)
 217  *
 218  *    Extract all parameters from received buffer, then feed them to
 219  *    check_params for parsing
 220  *
 221  */
 222 int irlan_provider_parse_command(struct irlan_cb *self, int cmd,
 223                                  struct sk_buff *skb)
 224 {
 225         __u8 *frame;
 226         __u8 *ptr;
 227         int count;
 228         __u16 val_len;
 229         int i;
 230         char *name;
 231         char *value;
 232         int ret = RSP_SUCCESS;
 233
 234         IRDA_ASSERT(skb != NULL, return -RSP_PROTOCOL_ERROR;);
 235
 236         IRDA_DEBUG(4, "%s(), skb->len=%d\n", __func__ , (int)skb->len);
 237
 238         IRDA_ASSERT(self != NULL, return -RSP_PROTOCOL_ERROR;);
 239         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return -RSP_PROTOCOL_ERROR;);
 240
 241         if (!skb)
 242                 return -RSP_PROTOCOL_ERROR;
 243
 244         frame = skb->data;
 245
 246         name = kmalloc(255, GFP_ATOMIC);
 247         if (!name)
 248                 return -RSP_INSUFFICIENT_RESOURCES;
 249         value = kmalloc(1016, GFP_ATOMIC);
 250         if (!value) {
 251                 kfree(name);
 252                 return -RSP_INSUFFICIENT_RESOURCES;
 253         }
 254
 255         /* How many parameters? */
 256         count = frame[1];
 257
 258         IRDA_DEBUG(4, "Got %d parameters\n", count);
 259
 260         ptr = frame+2;
 261
 262         /* For all parameters */
 263         for (i=0; i<count;i++) {
 264                 ret = irlan_extract_param(ptr, name, value, &val_len);
 265                 if (ret < 0) {
 266                         IRDA_DEBUG(2, "%s(), IrLAN, Error!\n", __func__ );
 267                         break;
 268                 }
 269                 ptr+=ret;
 270                 ret = RSP_SUCCESS;
 271                 irlan_check_command_param(self, name, value);
 272         }
 273         /* Cleanup */
 274         kfree(name);
 275         kfree(value);
 276
 277         return ret;
 278 }
 279
 280 /*
 281  * Function irlan_provider_send_reply (self, info)
 282  *
 283  *    Send reply to query to peer IrLAN layer
 284  *
 285  */
 286 void irlan_provider_send_reply(struct irlan_cb *self, int command,
 287                                int ret_code)
 288 {
 289         struct sk_buff *skb;
 290
 291         IRDA_DEBUG(4, "%s()\n", __func__ );
 292
 293         IRDA_ASSERT(self != NULL, return;);
 294         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 295
 296         skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
 297                         /* Bigger param length comes from CMD_GET_MEDIA_CHAR */
 298                         IRLAN_STRING_PARAMETER_LEN("FILTER_TYPE", "DIRECTED") +
 299                         IRLAN_STRING_PARAMETER_LEN("FILTER_TYPE", "BROADCAST") +
 300                         IRLAN_STRING_PARAMETER_LEN("FILTER_TYPE", "MULTICAST") +
 301                         IRLAN_STRING_PARAMETER_LEN("ACCESS_TYPE", "HOSTED"),
 302                         GFP_ATOMIC);
 303
 304         if (!skb)
 305                 return;
 306
 307         /* Reserve space for TTP, LMP, and LAP header */
 308         skb_reserve(skb, self->provider.max_header_size);
 309         skb_put(skb, 2);
 310
 311         switch (command) {
 312         case CMD_GET_PROVIDER_INFO:
 313                 skb->data[0] = 0x00; /* Success */
 314                 skb->data[1] = 0x02; /* 2 parameters */
 315                 switch (self->media) {
 316                 case MEDIA_802_3:
 317                         irlan_insert_string_param(skb, "MEDIA", "802.3");
 318                         break;
 319                 case MEDIA_802_5:
 320                         irlan_insert_string_param(skb, "MEDIA", "802.5");
 321                         break;
 322                 default:
 323                         IRDA_DEBUG(2, "%s(), unknown media type!\n", __func__ );
 324                         break;
 325                 }
 326                 irlan_insert_short_param(skb, "IRLAN_VER", 0x0101);
 327                 break;
 328
 329         case CMD_GET_MEDIA_CHAR:
 330                 skb->data[0] = 0x00; /* Success */
 331                 skb->data[1] = 0x05; /* 5 parameters */
 332                 irlan_insert_string_param(skb, "FILTER_TYPE", "DIRECTED");
 333                 irlan_insert_string_param(skb, "FILTER_TYPE", "BROADCAST");
 334                 irlan_insert_string_param(skb, "FILTER_TYPE", "MULTICAST");
 335
 336                 switch (self->provider.access_type) {
 337                 case ACCESS_DIRECT:
 338                         irlan_insert_string_param(skb, "ACCESS_TYPE", "DIRECT");
 339                         break;
 340                 case ACCESS_PEER:
 341                         irlan_insert_string_param(skb, "ACCESS_TYPE", "PEER");
 342                         break;
 343                 case ACCESS_HOSTED:
 344                         irlan_insert_string_param(skb, "ACCESS_TYPE", "HOSTED");
 345                         break;
 346                 default:
 347                         IRDA_DEBUG(2, "%s(), Unknown access type\n", __func__ );
 348                         break;
 349                 }
 350                 irlan_insert_short_param(skb, "MAX_FRAME", 0x05ee);
 351                 break;
 352         case CMD_OPEN_DATA_CHANNEL:
 353                 skb->data[0] = 0x00; /* Success */
 354                 if (self->provider.send_arb_val) {
 355                         skb->data[1] = 0x03; /* 3 parameters */
 356                         irlan_insert_short_param(skb, "CON_ARB",
 357                                                  self->provider.send_arb_val);
 358                 } else
 359                         skb->data[1] = 0x02; /* 2 parameters */
 360                 irlan_insert_byte_param(skb, "DATA_CHAN", self->stsap_sel_data);
 361                 irlan_insert_string_param(skb, "RECONNECT_KEY", "LINUX RULES!");
 362                 break;
 363         case CMD_FILTER_OPERATION:
 364                 irlan_filter_request(self, skb);
 365                 break;
 366         default:
 367                 IRDA_DEBUG(2, "%s(), Unknown command!\n", __func__ );
 368                 break;
 369         }
 370
 371         irttp_data_request(self->provider.tsap_ctrl, skb);
 372 }
 373
 374 /*
 375  * Function irlan_provider_register(void)
 376  *
 377  *    Register provider support so we can accept incoming connections.
 378  *
 379  */
 380 int irlan_provider_open_ctrl_tsap(struct irlan_cb *self)
 381 {
 382         struct tsap_cb *tsap;
 383         notify_t notify;
 384
 385         IRDA_DEBUG(4, "%s()\n", __func__ );
 386
 387         IRDA_ASSERT(self != NULL, return -1;);
 388         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return -1;);
 389
 390         /* Check if already open */
 391         if (self->provider.tsap_ctrl)
 392                 return -1;
 393
 394         /*
 395          *  First register well known control TSAP
 396          */
 397         irda_notify_init(&notify);
 398         notify.data_indication       = irlan_provider_data_indication;
 399         notify.connect_indication    = irlan_provider_connect_indication;
 400         notify.disconnect_indication = irlan_provider_disconnect_indication;
 401         notify.instance = self;
 402         strlcpy(notify.name, "IrLAN ctrl (p)", sizeof(notify.name));
 403
 404         tsap = irttp_open_tsap(LSAP_ANY, 1, &notify);
 405         if (!tsap) {
 406                 IRDA_DEBUG(2, "%s(), Got no tsap!\n", __func__ );
 407                 return -1;
 408         }
 409         self->provider.tsap_ctrl = tsap;
 410
 411         /* Register with LM-IAS */
 412         irlan_ias_register(self, tsap->stsap_sel);
 413
 414         return 0;
 415 }
 416