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/system.h>
  40 #include <asm/byteorder.h>
  41
  42 #include <net/irda/irda.h>
  43 #include <net/irda/irttp.h>
  44 #include <net/irda/irlmp.h>
  45 #include <net/irda/irias_object.h>
  46 #include <net/irda/iriap.h>
  47 #include <net/irda/timer.h>
  48
  49 #include <net/irda/irlan_common.h>
  50 #include <net/irda/irlan_eth.h>
  51 #include <net/irda/irlan_event.h>
  52 #include <net/irda/irlan_provider.h>
  53 #include <net/irda/irlan_filter.h>
  54 #include <net/irda/irlan_client.h>
  55
  56 static void irlan_provider_connect_indication(void *instance, void *sap,
  57                                               struct qos_info *qos,
  58                                               __u32 max_sdu_size,
  59                                               __u8 max_header_size,
  60                                               struct sk_buff *skb);
  61
  62 /*
  63  * Function irlan_provider_control_data_indication (handle, skb)
  64  *
  65  *    This function gets the data that is received on the control channel
  66  *
  67  */
  68 static int irlan_provider_data_indication(void *instance, void *sap,
  69                                           struct sk_buff *skb)
  70 {
  71         struct irlan_cb *self;
  72         __u8 code;
  73
  74         IRDA_DEBUG(4, "%s()\n", __func__ );
  75
  76         self = (struct irlan_cb *) instance;
  77
  78         IRDA_ASSERT(self != NULL, return -1;);
  79         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return -1;);
  80
  81         IRDA_ASSERT(skb != NULL, return -1;);
  82
  83         code = skb->data[0];
  84         switch(code) {
  85         case CMD_GET_PROVIDER_INFO:
  86                 IRDA_DEBUG(4, "Got GET_PROVIDER_INFO command!\n");
  87                 irlan_do_provider_event(self, IRLAN_GET_INFO_CMD, skb);
  88                 break;
  89
  90         case CMD_GET_MEDIA_CHAR:
  91                 IRDA_DEBUG(4, "Got GET_MEDIA_CHAR command!\n");
  92                 irlan_do_provider_event(self, IRLAN_GET_MEDIA_CMD, skb);
  93                 break;
  94         case CMD_OPEN_DATA_CHANNEL:
  95                 IRDA_DEBUG(4, "Got OPEN_DATA_CHANNEL command!\n");
  96                 irlan_do_provider_event(self, IRLAN_OPEN_DATA_CMD, skb);
  97                 break;
  98         case CMD_FILTER_OPERATION:
  99                 IRDA_DEBUG(4, "Got FILTER_OPERATION command!\n");
 100                 irlan_do_provider_event(self, IRLAN_FILTER_CONFIG_CMD, skb);
 101                 break;
 102         case CMD_RECONNECT_DATA_CHAN:
 103                 IRDA_DEBUG(2, "%s(), Got RECONNECT_DATA_CHAN command\n", __func__ );
 104                 IRDA_DEBUG(2, "%s(), NOT IMPLEMENTED\n", __func__ );
 105                 break;
 106         case CMD_CLOSE_DATA_CHAN:
 107                 IRDA_DEBUG(2, "Got CLOSE_DATA_CHAN command!\n");
 108                 IRDA_DEBUG(2, "%s(), NOT IMPLEMENTED\n", __func__ );
 109                 break;
 110         default:
 111                 IRDA_DEBUG(2, "%s(), Unknown command!\n", __func__ );
 112                 break;
 113         }
 114         return 0;
 115 }
 116
 117 /*
 118  * Function irlan_provider_connect_indication (handle, skb, priv)
 119  *
 120  *    Got connection from peer IrLAN client
 121  *
 122  */
 123 static void irlan_provider_connect_indication(void *instance, void *sap,
 124                                               struct qos_info *qos,
 125                                               __u32 max_sdu_size,
 126                                               __u8 max_header_size,
 127                                               struct sk_buff *skb)
 128 {
 129         struct irlan_cb *self;
 130         struct tsap_cb *tsap;
 131         __u32 saddr, daddr;
 132
 133         IRDA_DEBUG(0, "%s()\n", __func__ );
 134
 135         self = (struct irlan_cb *) instance;
 136         tsap = (struct tsap_cb *) sap;
 137
 138         IRDA_ASSERT(self != NULL, return;);
 139         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 140
 141         IRDA_ASSERT(tsap == self->provider.tsap_ctrl,return;);
 142         IRDA_ASSERT(self->provider.state == IRLAN_IDLE, return;);
 143
 144         daddr = irttp_get_daddr(tsap);
 145         saddr = irttp_get_saddr(tsap);
 146         self->provider.max_sdu_size = max_sdu_size;
 147         self->provider.max_header_size = max_header_size;
 148
 149         irlan_do_provider_event(self, IRLAN_CONNECT_INDICATION, NULL);
 150
 151         /*
 152          * If we are in peer mode, the client may not have got the discovery
 153          * indication it needs to make progress. If the client is still in
 154          * IDLE state, we must kick it.
 155          */
 156         if ((self->provider.access_type == ACCESS_PEER) &&
 157             (self->client.state == IRLAN_IDLE))
 158         {
 159                 irlan_client_wakeup(self, self->saddr, self->daddr);
 160         }
 161 }
 162
 163 /*
 164  * Function irlan_provider_connect_response (handle)
 165  *
 166  *    Accept incoming connection
 167  *
 168  */
 169 void irlan_provider_connect_response(struct irlan_cb *self,
 170                                      struct tsap_cb *tsap)
 171 {
 172         IRDA_ASSERT(self != NULL, return;);
 173         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 174
 175         /* Just accept */
 176         irttp_connect_response(tsap, IRLAN_MTU, NULL);
 177 }
 178
 179 static void irlan_provider_disconnect_indication(void *instance, void *sap,
 180                                                  LM_REASON reason,
 181                                                  struct sk_buff *userdata)
 182 {
 183         struct irlan_cb *self;
 184         struct tsap_cb *tsap;
 185
 186         IRDA_DEBUG(4, "%s(), reason=%d\n", __func__ , reason);
 187
 188         self = (struct irlan_cb *) instance;
 189         tsap = (struct tsap_cb *) sap;
 190
 191         IRDA_ASSERT(self != NULL, return;);
 192         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 193         IRDA_ASSERT(tsap != NULL, return;);
 194         IRDA_ASSERT(tsap->magic == TTP_TSAP_MAGIC, return;);
 195
 196         IRDA_ASSERT(tsap == self->provider.tsap_ctrl, return;);
 197
 198         irlan_do_provider_event(self, IRLAN_LMP_DISCONNECT, NULL);
 199 }
 200
 201 /*
 202  * Function irlan_parse_open_data_cmd (self, skb)
 203  *
 204  *
 205  *
 206  */
 207 int irlan_parse_open_data_cmd(struct irlan_cb *self, struct sk_buff *skb)
 208 {
 209         int ret;
 210
 211         ret = irlan_provider_parse_command(self, CMD_OPEN_DATA_CHANNEL, skb);
 212
 213         /* Open data channel */
 214         irlan_open_data_tsap(self);
 215
 216         return ret;
 217 }
 218
 219 /*
 220  * Function parse_command (skb)
 221  *
 222  *    Extract all parameters from received buffer, then feed them to
 223  *    check_params for parsing
 224  *
 225  */
 226 int irlan_provider_parse_command(struct irlan_cb *self, int cmd,
 227                                  struct sk_buff *skb)
 228 {
 229         __u8 *frame;
 230         __u8 *ptr;
 231         int count;
 232         __u16 val_len;
 233         int i;
 234         char *name;
 235         char *value;
 236         int ret = RSP_SUCCESS;
 237
 238         IRDA_ASSERT(skb != NULL, return -RSP_PROTOCOL_ERROR;);
 239
 240         IRDA_DEBUG(4, "%s(), skb->len=%d\n", __func__ , (int)skb->len);
 241
 242         IRDA_ASSERT(self != NULL, return -RSP_PROTOCOL_ERROR;);
 243         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return -RSP_PROTOCOL_ERROR;);
 244
 245         if (!skb)
 246                 return -RSP_PROTOCOL_ERROR;
 247
 248         frame = skb->data;
 249
 250         name = kmalloc(255, GFP_ATOMIC);
 251         if (!name)
 252                 return -RSP_INSUFFICIENT_RESOURCES;
 253         value = kmalloc(1016, GFP_ATOMIC);
 254         if (!value) {
 255                 kfree(name);
 256                 return -RSP_INSUFFICIENT_RESOURCES;
 257         }
 258
 259         /* How many parameters? */
 260         count = frame[1];
 261
 262         IRDA_DEBUG(4, "Got %d parameters\n", count);
 263
 264         ptr = frame+2;
 265
 266         /* For all parameters */
 267         for (i=0; i<count;i++) {
 268                 ret = irlan_extract_param(ptr, name, value, &val_len);
 269                 if (ret < 0) {
 270                         IRDA_DEBUG(2, "%s(), IrLAN, Error!\n", __func__ );
 271                         break;
 272                 }
 273                 ptr+=ret;
 274                 ret = RSP_SUCCESS;
 275                 irlan_check_command_param(self, name, value);
 276         }
 277         /* Cleanup */
 278         kfree(name);
 279         kfree(value);
 280
 281         return ret;
 282 }
 283
 284 /*
 285  * Function irlan_provider_send_reply (self, info)
 286  *
 287  *    Send reply to query to peer IrLAN layer
 288  *
 289  */
 290 void irlan_provider_send_reply(struct irlan_cb *self, int command,
 291                                int ret_code)
 292 {
 293         struct sk_buff *skb;
 294
 295         IRDA_DEBUG(4, "%s()\n", __func__ );
 296
 297         IRDA_ASSERT(self != NULL, return;);
 298         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 299
 300         skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
 301                         /* Bigger param length comes from CMD_GET_MEDIA_CHAR */
 302                         IRLAN_STRING_PARAMETER_LEN("FILTER_TYPE", "DIRECTED") +
 303                         IRLAN_STRING_PARAMETER_LEN("FILTER_TYPE", "BORADCAST") +
 304                         IRLAN_STRING_PARAMETER_LEN("FILTER_TYPE", "MULTICAST") +
 305                         IRLAN_STRING_PARAMETER_LEN("ACCESS_TYPE", "HOSTED"),
 306                         GFP_ATOMIC);
 307
 308         if (!skb)
 309                 return;
 310
 311         /* Reserve space for TTP, LMP, and LAP header */
 312         skb_reserve(skb, self->provider.max_header_size);
 313         skb_put(skb, 2);
 314
 315         switch (command) {
 316         case CMD_GET_PROVIDER_INFO:
 317                 skb->data[0] = 0x00; /* Success */
 318                 skb->data[1] = 0x02; /* 2 parameters */
 319                 switch (self->media) {
 320                 case MEDIA_802_3:
 321                         irlan_insert_string_param(skb, "MEDIA", "802.3");
 322                         break;
 323                 case MEDIA_802_5:
 324                         irlan_insert_string_param(skb, "MEDIA", "802.5");
 325                         break;
 326                 default:
 327                         IRDA_DEBUG(2, "%s(), unknown media type!\n", __func__ );
 328                         break;
 329                 }
 330                 irlan_insert_short_param(skb, "IRLAN_VER", 0x0101);
 331                 break;
 332
 333         case CMD_GET_MEDIA_CHAR:
 334                 skb->data[0] = 0x00; /* Success */
 335                 skb->data[1] = 0x05; /* 5 parameters */
 336                 irlan_insert_string_param(skb, "FILTER_TYPE", "DIRECTED");
 337                 irlan_insert_string_param(skb, "FILTER_TYPE", "BROADCAST");
 338                 irlan_insert_string_param(skb, "FILTER_TYPE", "MULTICAST");
 339
 340                 switch (self->provider.access_type) {
 341                 case ACCESS_DIRECT:
 342                         irlan_insert_string_param(skb, "ACCESS_TYPE", "DIRECT");
 343                         break;
 344                 case ACCESS_PEER:
 345                         irlan_insert_string_param(skb, "ACCESS_TYPE", "PEER");
 346                         break;
 347                 case ACCESS_HOSTED:
 348                         irlan_insert_string_param(skb, "ACCESS_TYPE", "HOSTED");
 349                         break;
 350                 default:
 351                         IRDA_DEBUG(2, "%s(), Unknown access type\n", __func__ );
 352                         break;
 353                 }
 354                 irlan_insert_short_param(skb, "MAX_FRAME", 0x05ee);
 355                 break;
 356         case CMD_OPEN_DATA_CHANNEL:
 357                 skb->data[0] = 0x00; /* Success */
 358                 if (self->provider.send_arb_val) {
 359                         skb->data[1] = 0x03; /* 3 parameters */
 360                         irlan_insert_short_param(skb, "CON_ARB",
 361                                                  self->provider.send_arb_val);
 362                 } else
 363                         skb->data[1] = 0x02; /* 2 parameters */
 364                 irlan_insert_byte_param(skb, "DATA_CHAN", self->stsap_sel_data);
 365                 irlan_insert_string_param(skb, "RECONNECT_KEY", "LINUX RULES!");
 366                 break;
 367         case CMD_FILTER_OPERATION:
 368                 irlan_filter_request(self, skb);
 369                 break;
 370         default:
 371                 IRDA_DEBUG(2, "%s(), Unknown command!\n", __func__ );
 372                 break;
 373         }
 374
 375         irttp_data_request(self->provider.tsap_ctrl, skb);
 376 }
 377
 378 /*
 379  * Function irlan_provider_register(void)
 380  *
 381  *    Register provider support so we can accept incoming connections.
 382  *
 383  */
 384 int irlan_provider_open_ctrl_tsap(struct irlan_cb *self)
 385 {
 386         struct tsap_cb *tsap;
 387         notify_t notify;
 388
 389         IRDA_DEBUG(4, "%s()\n", __func__ );
 390
 391         IRDA_ASSERT(self != NULL, return -1;);
 392         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return -1;);
 393
 394         /* Check if already open */
 395         if (self->provider.tsap_ctrl)
 396                 return -1;
 397
 398         /*
 399          *  First register well known control TSAP
 400          */
 401         irda_notify_init(&notify);
 402         notify.data_indication       = irlan_provider_data_indication;
 403         notify.connect_indication    = irlan_provider_connect_indication;
 404         notify.disconnect_indication = irlan_provider_disconnect_indication;
 405         notify.instance = self;
 406         strlcpy(notify.name, "IrLAN ctrl (p)", sizeof(notify.name));
 407
 408         tsap = irttp_open_tsap(LSAP_ANY, 1, &notify);
 409         if (!tsap) {
 410                 IRDA_DEBUG(2, "%s(), Got no tsap!\n", __func__ );
 411                 return -1;
 412         }
 413         self->provider.tsap_ctrl = tsap;
 414
 415         /* Register with LM-IAS */
 416         irlan_ias_register(self, tsap->stsap_sel);
 417
 418         return 0;
 419 }
 420