sys/netgraph7/bluetooth/l2cap/ng_l2cap_cmds.c

   1 /*
   2  * ng_l2cap_cmds.c
   3  */
   4
   5 /*-
   6  * Copyright (c) Maksim Yevmenkin <m_evmenkin@yahoo.com>
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  *
  30  * $Id: ng_l2cap_cmds.c,v 1.2 2003/09/08 19:11:45 max Exp $
  31  * $FreeBSD: src/sys/netgraph/bluetooth/l2cap/ng_l2cap_cmds.c,v 1.7 2007/03/28 21:25:56 emax Exp $
  32  */
  33
  34 #include <sys/param.h>
  35 #include <sys/systm.h>
  36 #include <sys/kernel.h>
  37 #include <sys/endian.h>
  38 #include <sys/malloc.h>
  39 #include <sys/mbuf.h>
  40 #include <sys/queue.h>
  41 #include <netgraph7/ng_message.h>
  42 #include <netgraph7/netgraph.h>
  43 #include <netgraph7/bluetooth/include/ng_bluetooth.h>
  44 #include <netgraph7/bluetooth/include/ng_hci.h>
  45 #include <netgraph7/bluetooth/include/ng_l2cap.h>
  46 #include <netgraph7/bluetooth/l2cap/ng_l2cap_var.h>
  47 #include <netgraph7/bluetooth/l2cap/ng_l2cap_cmds.h>
  48 #include <netgraph7/bluetooth/l2cap/ng_l2cap_evnt.h>
  49 #include <netgraph7/bluetooth/l2cap/ng_l2cap_llpi.h>
  50 #include <netgraph7/bluetooth/l2cap/ng_l2cap_ulpi.h>
  51 #include <netgraph7/bluetooth/l2cap/ng_l2cap_misc.h>
  52
  53 /******************************************************************************
  54  ******************************************************************************
  55  **                    L2CAP commands processing module
  56  ******************************************************************************
  57  ******************************************************************************/
  58
  59 /*
  60  * Process L2CAP command queue on connection
  61  */
  62
  63 void
  64 ng_l2cap_con_wakeup(ng_l2cap_con_p con)
  65 {
  66         ng_l2cap_cmd_p   cmd = NULL;
  67         struct mbuf     *m = NULL;
  68         int              error = 0;
  69
  70         /* Find first non-pending command in the queue */
  71         TAILQ_FOREACH(cmd, &con->cmd_list, next) {
  72                 KASSERT((cmd->con == con),
  73 ("%s: %s - invalid connection pointer!\n",
  74                         __func__, NG_NODE_NAME(con->l2cap->node)));
  75
  76                 if (!(cmd->flags & NG_L2CAP_CMD_PENDING))
  77                         break;
  78         }
  79
  80         if (cmd == NULL)
  81                 return;
  82
  83         /* Detach command packet */
  84         m = cmd->aux;
  85         cmd->aux = NULL;
  86
  87         /* Process command */
  88         switch (cmd->code) {
  89         case NG_L2CAP_CMD_REJ:
  90         case NG_L2CAP_DISCON_RSP:
  91         case NG_L2CAP_ECHO_RSP:
  92         case NG_L2CAP_INFO_RSP:
  93                 /*
  94                  * Do not check return ng_l2cap_lp_send() value, because
  95                  * in these cases we do not really have a graceful way out.
  96                  * ECHO and INFO responses are internal to the stack and not
  97                  * visible to user. REJect is just being nice to remote end
  98                  * (otherwise remote end will timeout anyway). DISCON is
  99                  * probably most interesting here, however, if it fails
 100                  * there is nothing we can do anyway.
 101                  */
 102
 103                 (void) ng_l2cap_lp_send(con, NG_L2CAP_SIGNAL_CID, m);
 104                 ng_l2cap_unlink_cmd(cmd);
 105                 ng_l2cap_free_cmd(cmd);
 106                 break;
 107
 108         case NG_L2CAP_CON_REQ:
 109                 error = ng_l2cap_lp_send(con, NG_L2CAP_SIGNAL_CID, m);
 110                 if (error != 0) {
 111                         ng_l2cap_l2ca_con_rsp(cmd->ch, cmd->token,
 112                                 NG_L2CAP_NO_RESOURCES, 0);
 113                         ng_l2cap_free_chan(cmd->ch); /* will free commands */
 114                 } else
 115                         ng_l2cap_command_timeout(cmd,
 116                                 bluetooth_l2cap_rtx_timeout());
 117                 break;
 118
 119         case NG_L2CAP_CON_RSP:
 120                 error = ng_l2cap_lp_send(con, NG_L2CAP_SIGNAL_CID, m);
 121                 ng_l2cap_unlink_cmd(cmd);
 122                 if (cmd->ch != NULL) {
 123                         ng_l2cap_l2ca_con_rsp_rsp(cmd->ch, cmd->token,
 124                                 (error == 0)? NG_L2CAP_SUCCESS :
 125                                         NG_L2CAP_NO_RESOURCES);
 126                         if (error != 0)
 127                                 ng_l2cap_free_chan(cmd->ch);
 128                 }
 129                 ng_l2cap_free_cmd(cmd);
 130                 break;
 131
 132         case NG_L2CAP_CFG_REQ:
 133                 error = ng_l2cap_lp_send(con, NG_L2CAP_SIGNAL_CID, m);
 134                 if (error != 0) {
 135                         ng_l2cap_l2ca_cfg_rsp(cmd->ch, cmd->token,
 136                                 NG_L2CAP_NO_RESOURCES);
 137                         ng_l2cap_unlink_cmd(cmd);
 138                         ng_l2cap_free_cmd(cmd);
 139                 } else
 140                         ng_l2cap_command_timeout(cmd,
 141                                 bluetooth_l2cap_rtx_timeout());
 142                 break;
 143
 144         case NG_L2CAP_CFG_RSP:
 145                 error = ng_l2cap_lp_send(con, NG_L2CAP_SIGNAL_CID, m);
 146                 ng_l2cap_unlink_cmd(cmd);
 147                 if (cmd->ch != NULL)
 148                         ng_l2cap_l2ca_cfg_rsp_rsp(cmd->ch, cmd->token,
 149                                 (error == 0)? NG_L2CAP_SUCCESS :
 150                                         NG_L2CAP_NO_RESOURCES);
 151                 ng_l2cap_free_cmd(cmd);
 152                 break;
 153
 154         case NG_L2CAP_DISCON_REQ:
 155                 error = ng_l2cap_lp_send(con, NG_L2CAP_SIGNAL_CID, m);
 156                 ng_l2cap_l2ca_discon_rsp(cmd->ch, cmd->token,
 157                         (error == 0)? NG_L2CAP_SUCCESS : NG_L2CAP_NO_RESOURCES);
 158                 if (error != 0)
 159                         ng_l2cap_free_chan(cmd->ch); /* XXX free channel */
 160                 else
 161                         ng_l2cap_command_timeout(cmd,
 162                                 bluetooth_l2cap_rtx_timeout());
 163                 break;
 164
 165         case NG_L2CAP_ECHO_REQ:
 166                 error = ng_l2cap_lp_send(con, NG_L2CAP_SIGNAL_CID, m);
 167                 if (error != 0) {
 168                         ng_l2cap_l2ca_ping_rsp(con, cmd->token,
 169                                         NG_L2CAP_NO_RESOURCES, NULL);
 170                         ng_l2cap_unlink_cmd(cmd);
 171                         ng_l2cap_free_cmd(cmd);
 172                 } else
 173                         ng_l2cap_command_timeout(cmd,
 174                                 bluetooth_l2cap_rtx_timeout());
 175                 break;
 176
 177         case NG_L2CAP_INFO_REQ:
 178                 error = ng_l2cap_lp_send(con, NG_L2CAP_SIGNAL_CID, m);
 179                 if (error != 0) {
 180                         ng_l2cap_l2ca_get_info_rsp(con, cmd->token,
 181                                 NG_L2CAP_NO_RESOURCES, NULL);
 182                         ng_l2cap_unlink_cmd(cmd);
 183                         ng_l2cap_free_cmd(cmd);
 184                 } else
 185                         ng_l2cap_command_timeout(cmd,
 186                                 bluetooth_l2cap_rtx_timeout());
 187                 break;
 188
 189         case NGM_L2CAP_L2CA_WRITE: {
 190                 int     length = m->m_pkthdr.len;
 191
 192                 if (cmd->ch->dcid == NG_L2CAP_CLT_CID) {
 193                         m = ng_l2cap_prepend(m, sizeof(ng_l2cap_clt_hdr_t));
 194                         if (m == NULL)
 195                                 error = ENOBUFS;
 196                         else
 197                                 mtod(m, ng_l2cap_clt_hdr_t *)->psm =
 198                                                         htole16(cmd->ch->psm);
 199                 }
 200
 201                 if (error == 0)
 202                         error = ng_l2cap_lp_send(con, cmd->ch->dcid, m);
 203
 204                 ng_l2cap_l2ca_write_rsp(cmd->ch, cmd->token,
 205                         (error == 0)? NG_L2CAP_SUCCESS : NG_L2CAP_NO_RESOURCES,
 206                         length);
 207
 208                 ng_l2cap_unlink_cmd(cmd);
 209                 ng_l2cap_free_cmd(cmd);
 210                 } break;
 211
 212         /* XXX FIXME add other commands */
 213
 214         default:
 215                 panic(
 216 "%s: %s - unknown command code=%d\n",
 217                         __func__, NG_NODE_NAME(con->l2cap->node), cmd->code);
 218                 break;
 219         }
 220 } /* ng_l2cap_con_wakeup */
 221
 222 /*
 223  * We have failed to open ACL connection to the remote unit. Could be negative
 224  * confirmation or timeout. So fail any "delayed" commands, notify upper layer,
 225  * remove all channels and remove connection descriptor.
 226  */
 227
 228 void
 229 ng_l2cap_con_fail(ng_l2cap_con_p con, u_int16_t result)
 230 {
 231         ng_l2cap_p      l2cap = con->l2cap;
 232         ng_l2cap_cmd_p  cmd = NULL;
 233         ng_l2cap_chan_p ch = NULL;
 234
 235         NG_L2CAP_INFO(
 236 "%s: %s - ACL connection failed, result=%d\n",
 237                 __func__, NG_NODE_NAME(l2cap->node), result);
 238
 239         /* Connection is dying */
 240         con->flags |= NG_L2CAP_CON_DYING;
 241
 242         /* Clean command queue */
 243         while (!TAILQ_EMPTY(&con->cmd_list)) {
 244                 cmd = TAILQ_FIRST(&con->cmd_list);
 245
 246                 ng_l2cap_unlink_cmd(cmd);
 247                 if(cmd->flags & NG_L2CAP_CMD_PENDING)
 248                         ng_l2cap_command_untimeout(cmd);
 249
 250                 KASSERT((cmd->con == con),
 251 ("%s: %s - invalid connection pointer!\n",
 252                         __func__, NG_NODE_NAME(l2cap->node)));
 253
 254                 switch (cmd->code) {
 255                 case NG_L2CAP_CMD_REJ:
 256                 case NG_L2CAP_DISCON_RSP:
 257                 case NG_L2CAP_ECHO_RSP:
 258                 case NG_L2CAP_INFO_RSP:
 259                         break;
 260
 261                 case NG_L2CAP_CON_REQ:
 262                         ng_l2cap_l2ca_con_rsp(cmd->ch, cmd->token, result, 0);
 263                         break;
 264
 265                 case NG_L2CAP_CON_RSP:
 266                         if (cmd->ch != NULL)
 267                                 ng_l2cap_l2ca_con_rsp_rsp(cmd->ch, cmd->token,
 268                                         result);
 269                         break;
 270
 271                 case NG_L2CAP_CFG_REQ:
 272                 case NG_L2CAP_CFG_RSP:
 273                 case NGM_L2CAP_L2CA_WRITE:
 274                         ng_l2cap_l2ca_discon_ind(cmd->ch);
 275                         break;
 276
 277                 case NG_L2CAP_DISCON_REQ:
 278                         ng_l2cap_l2ca_discon_rsp(cmd->ch, cmd->token,
 279                                 NG_L2CAP_SUCCESS);
 280                         break;
 281
 282                 case NG_L2CAP_ECHO_REQ:
 283                         ng_l2cap_l2ca_ping_rsp(cmd->con, cmd->token,
 284                                 result, NULL);
 285                         break;
 286
 287                 case NG_L2CAP_INFO_REQ:
 288                         ng_l2cap_l2ca_get_info_rsp(cmd->con, cmd->token,
 289                                 result, NULL);
 290                         break;
 291
 292                 /* XXX FIXME add other commands */
 293
 294                 default:
 295                         panic(
 296 "%s: %s - unexpected command code=%d\n",
 297                                 __func__, NG_NODE_NAME(l2cap->node), cmd->code);
 298                         break;
 299                 }
 300
 301                 if (cmd->ch != NULL)
 302                         ng_l2cap_free_chan(cmd->ch);
 303
 304                 ng_l2cap_free_cmd(cmd);
 305         }
 306
 307         /*
 308          * There still might be channels (in OPEN state?) that
 309          * did not submit any commands, so diconnect them
 310          */
 311
 312         LIST_FOREACH(ch, &l2cap->chan_list, next)
 313                 if (ch->con == con)
 314                         ng_l2cap_l2ca_discon_ind(ch);
 315
 316         /* Free connection descriptor */
 317         ng_l2cap_free_con(con);
 318 } /* ng_l2cap_con_fail */
 319
 320 /*
 321  * Process L2CAP command timeout. In general - notify upper layer and destroy
 322  * channel. Do not pay much attension to return code, just do our best.
 323  */
 324
 325 void
 326 ng_l2cap_process_command_timeout(node_p node, hook_p hook, void *arg1, int arg2)
 327 {
 328         ng_l2cap_p      l2cap = NULL;
 329         ng_l2cap_con_p  con = NULL;
 330         ng_l2cap_cmd_p  cmd = NULL;
 331         u_int16_t       con_handle = (arg2 & 0x0ffff);
 332         u_int8_t        ident = ((arg2 >> 16) & 0xff);
 333
 334         if (NG_NODE_NOT_VALID(node)) {
 335                 kprintf("%s: Netgraph node is not valid\n", __func__);
 336                 return;
 337         }
 338
 339         l2cap = (ng_l2cap_p) NG_NODE_PRIVATE(node);
 340
 341         con = ng_l2cap_con_by_handle(l2cap, con_handle);
 342         if (con == NULL) {
 343                 NG_L2CAP_ALERT(
 344 "%s: %s - could not find connection, con_handle=%d\n",
 345                         __func__, NG_NODE_NAME(node), con_handle);
 346                 return;
 347         }
 348
 349         cmd = ng_l2cap_cmd_by_ident(con, ident);
 350         if (cmd == NULL) {
 351                 NG_L2CAP_ALERT(
 352 "%s: %s - could not find command, con_handle=%d, ident=%d\n",
 353                         __func__, NG_NODE_NAME(node), con_handle, ident);
 354                 return;
 355         }
 356
 357         cmd->flags &= ~NG_L2CAP_CMD_PENDING;
 358         ng_l2cap_unlink_cmd(cmd);
 359
 360         switch (cmd->code) {
 361         case NG_L2CAP_CON_REQ:
 362                 ng_l2cap_l2ca_con_rsp(cmd->ch, cmd->token, NG_L2CAP_TIMEOUT, 0);
 363                 ng_l2cap_free_chan(cmd->ch);
 364                 break;
 365
 366         case NG_L2CAP_CFG_REQ:
 367                 ng_l2cap_l2ca_cfg_rsp(cmd->ch, cmd->token, NG_L2CAP_TIMEOUT);
 368                 break;
 369
 370         case NG_L2CAP_DISCON_REQ:
 371                 ng_l2cap_l2ca_discon_rsp(cmd->ch, cmd->token, NG_L2CAP_TIMEOUT);
 372                 ng_l2cap_free_chan(cmd->ch); /* XXX free channel */
 373                 break;
 374
 375         case NG_L2CAP_ECHO_REQ:
 376                 /* Echo request timed out. Let the upper layer know */
 377                 ng_l2cap_l2ca_ping_rsp(cmd->con, cmd->token,
 378                         NG_L2CAP_TIMEOUT, NULL);
 379                 break;
 380
 381         case NG_L2CAP_INFO_REQ:
 382                 /* Info request timed out. Let the upper layer know */
 383                 ng_l2cap_l2ca_get_info_rsp(cmd->con, cmd->token,
 384                         NG_L2CAP_TIMEOUT, NULL);
 385                 break;
 386
 387         /* XXX FIXME add other commands */
 388
 389         default:
 390                 panic(
 391 "%s: %s - unexpected command code=%d\n",
 392                         __func__, NG_NODE_NAME(l2cap->node), cmd->code);
 393                 break;
 394         }
 395
 396         ng_l2cap_free_cmd(cmd);
 397 } /* ng_l2cap_process_command_timeout */
 398