sys/netgraph/bluetooth/l2cap/ng_l2cap_main.c

   1 /*
   2  * ng_l2cap_main.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_main.c,v 1.2 2003/04/28 21:44:59 max Exp $
  31  * $FreeBSD$
  32  */
  33
  34 #include <sys/param.h>
  35 #include <sys/systm.h>
  36 #include <sys/kernel.h>
  37 #include <sys/malloc.h>
  38 #include <sys/mbuf.h>
  39 #include <sys/queue.h>
  40 #include <netgraph/ng_message.h>
  41 #include <netgraph/netgraph.h>
  42 #include <netgraph/ng_parse.h>
  43 #include <netgraph/bluetooth/include/ng_bluetooth.h>
  44 #include <netgraph/bluetooth/include/ng_hci.h>
  45 #include <netgraph/bluetooth/include/ng_l2cap.h>
  46 #include <netgraph/bluetooth/l2cap/ng_l2cap_var.h>
  47 #include <netgraph/bluetooth/l2cap/ng_l2cap_cmds.h>
  48 #include <netgraph/bluetooth/l2cap/ng_l2cap_evnt.h>
  49 #include <netgraph/bluetooth/l2cap/ng_l2cap_llpi.h>
  50 #include <netgraph/bluetooth/l2cap/ng_l2cap_ulpi.h>
  51 #include <netgraph/bluetooth/l2cap/ng_l2cap_misc.h>
  52 #include <netgraph/bluetooth/l2cap/ng_l2cap_prse.h>
  53
  54 /******************************************************************************
  55  ******************************************************************************
  56  **  This node implements Link Layer Control and Adaptation Protocol (L2CAP)
  57  ******************************************************************************
  58  ******************************************************************************/
  59
  60 /* MALLOC define */
  61 #ifdef NG_SEPARATE_MALLOC
  62 MALLOC_DEFINE(M_NETGRAPH_L2CAP, "netgraph_l2cap",
  63         "Netgraph Bluetooth L2CAP node");
  64 #else
  65 #define M_NETGRAPH_L2CAP M_NETGRAPH
  66 #endif /* NG_SEPARATE_MALLOC */
  67
  68 /* Netgraph node methods */
  69 static  ng_constructor_t        ng_l2cap_constructor;
  70 static  ng_shutdown_t           ng_l2cap_shutdown;
  71 static  ng_newhook_t            ng_l2cap_newhook;
  72 static  ng_connect_t            ng_l2cap_connect;
  73 static  ng_disconnect_t         ng_l2cap_disconnect;
  74 static  ng_rcvmsg_t             ng_l2cap_lower_rcvmsg;
  75 static  ng_rcvmsg_t             ng_l2cap_upper_rcvmsg;
  76 static  ng_rcvmsg_t             ng_l2cap_default_rcvmsg;
  77 static  ng_rcvdata_t            ng_l2cap_rcvdata;
  78
  79 /* Netgraph node type descriptor */
  80 static  struct ng_type typestruct = {
  81         .version =      NG_ABI_VERSION,
  82         .name =         NG_L2CAP_NODE_TYPE,
  83         .constructor =  ng_l2cap_constructor,
  84         .rcvmsg =       ng_l2cap_default_rcvmsg,
  85         .shutdown =     ng_l2cap_shutdown,
  86         .newhook =      ng_l2cap_newhook,
  87         .connect =      ng_l2cap_connect,
  88         .rcvdata =      ng_l2cap_rcvdata,
  89         .disconnect =   ng_l2cap_disconnect,
  90         .cmdlist =      ng_l2cap_cmdlist,
  91 };
  92 NETGRAPH_INIT(l2cap, &typestruct);
  93 MODULE_VERSION(ng_l2cap, NG_BLUETOOTH_VERSION);
  94 MODULE_DEPEND(ng_l2cap, ng_bluetooth, NG_BLUETOOTH_VERSION,
  95         NG_BLUETOOTH_VERSION, NG_BLUETOOTH_VERSION);
  96
  97 /*****************************************************************************
  98  *****************************************************************************
  99  **                   Netgraph methods implementation
 100  *****************************************************************************
 101  *****************************************************************************/
 102
 103 static void ng_l2cap_cleanup          (ng_l2cap_p);
 104 static void ng_l2cap_destroy_channels (ng_l2cap_p);
 105
 106 /*
 107  * Create new instance of L2CAP node
 108  */
 109
 110 static int
 111 ng_l2cap_constructor(node_p node)
 112 {
 113         ng_l2cap_p      l2cap = NULL;
 114
 115         /* Create new L2CAP node */
 116         l2cap = malloc(sizeof(*l2cap), M_NETGRAPH_L2CAP, M_WAITOK | M_ZERO);
 117
 118         l2cap->node = node;
 119         l2cap->debug = NG_L2CAP_WARN_LEVEL;
 120         l2cap->discon_timo = 5; /* sec */
 121
 122         LIST_INIT(&l2cap->con_list);
 123         LIST_INIT(&l2cap->chan_list);
 124
 125         NG_NODE_SET_PRIVATE(node, l2cap);
 126         NG_NODE_FORCE_WRITER(node);
 127
 128         return (0);
 129 } /* ng_l2cap_constructor */
 130
 131 /*
 132  * Shutdown L2CAP node
 133  */
 134
 135 static int
 136 ng_l2cap_shutdown(node_p node)
 137 {
 138         ng_l2cap_p      l2cap = (ng_l2cap_p) NG_NODE_PRIVATE(node);
 139
 140         NG_NODE_SET_PRIVATE(node, NULL);
 141         NG_NODE_UNREF(node);
 142
 143         /* Clean up L2CAP node. Delete all connection, channels and commands */
 144         l2cap->node = NULL;
 145         ng_l2cap_cleanup(l2cap);
 146
 147         bzero(l2cap, sizeof(*l2cap));
 148         free(l2cap, M_NETGRAPH_L2CAP);
 149
 150         return (0);
 151 } /* ng_l2cap_shutdown */
 152
 153 /*
 154  * Give our OK for a hook to be added. HCI layer is connected to the HCI
 155  * (NG_L2CAP_HOOK_HCI) hook. As per specification L2CAP layer MUST provide
 156  * Procol/Service Multiplexing, so the L2CAP node provides separate hooks
 157  * for SDP (NG_L2CAP_HOOK_SDP), RFCOMM (NG_L2CAP_HOOK_RFCOMM) and TCP
 158  * (NG_L2CAP_HOOK_TCP) protcols. Unknown PSM will be forwarded to
 159  * NG_L2CAP_HOOK_ORPHAN hook. Control node/application is connected to
 160  * control (NG_L2CAP_HOOK_CTL) hook.
 161  */
 162
 163 static int
 164 ng_l2cap_newhook(node_p node, hook_p hook, char const *name)
 165 {
 166         ng_l2cap_p       l2cap = (ng_l2cap_p) NG_NODE_PRIVATE(node);
 167         hook_p          *h = NULL;
 168
 169         if (strcmp(name, NG_L2CAP_HOOK_HCI) == 0)
 170                 h = &l2cap->hci;
 171         else if (strcmp(name, NG_L2CAP_HOOK_L2C) == 0)
 172                 h = &l2cap->l2c;
 173         else if (strcmp(name, NG_L2CAP_HOOK_CTL) == 0)
 174                 h = &l2cap->ctl;
 175         else
 176                 return (EINVAL);
 177
 178         if (*h != NULL)
 179                 return (EISCONN);
 180
 181         *h = hook;
 182
 183         return (0);
 184 } /* ng_l2cap_newhook */
 185
 186 /*
 187  * Give our final OK to connect hook. Nothing to do here.
 188  */
 189
 190 static int
 191 ng_l2cap_connect(hook_p hook)
 192 {
 193         ng_l2cap_p      l2cap = (ng_l2cap_p) NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 194         int             error = 0;
 195
 196         if (hook == l2cap->hci)
 197                 NG_HOOK_SET_RCVMSG(hook, ng_l2cap_lower_rcvmsg);
 198         else
 199         if (hook == l2cap->l2c || hook == l2cap->ctl) {
 200                 NG_HOOK_SET_RCVMSG(hook, ng_l2cap_upper_rcvmsg);
 201
 202                 /* Send delayed notification to the upper layer */
 203                 error = ng_send_fn(l2cap->node, hook, ng_l2cap_send_hook_info,
 204                                 NULL, 0);
 205         } else
 206                 error = EINVAL;
 207
 208         return (error);
 209 } /* ng_l2cap_connect */
 210
 211 /*
 212  * Disconnect the hook. For downstream hook we must notify upper layers.
 213  *
 214  * XXX For upstream hooks this is really ugly :( Hook was disconnected and it
 215  * XXX is now too late to do anything. For now we just clean up our own mess
 216  * XXX and remove all channels that use disconnected upstream hook. If we don't
 217  * XXX do that then L2CAP node can get out of sync with upper layers.
 218  * XXX No notification will be sent to remote peer.
 219  */
 220
 221 static int
 222 ng_l2cap_disconnect(hook_p hook)
 223 {
 224         ng_l2cap_p       l2cap = (ng_l2cap_p) NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 225         hook_p          *h = NULL;
 226
 227         if (hook == l2cap->hci) {
 228                 ng_l2cap_cleanup(l2cap);
 229                 h = &l2cap->hci;
 230         } else
 231         if (hook == l2cap->l2c) {
 232                 ng_l2cap_destroy_channels(l2cap);
 233                 h = &l2cap->l2c;
 234         } else
 235         if (hook == l2cap->ctl)
 236                 h = &l2cap->ctl;
 237         else
 238                 return (EINVAL);
 239
 240         *h = NULL;
 241
 242         /* Shutdown when all hooks are disconnected */
 243         if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0 &&
 244             NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))
 245                 ng_rmnode_self(NG_HOOK_NODE(hook));
 246
 247         return (0);
 248 } /* ng_l2cap_disconnect */
 249
 250 /*
 251  * Process control message from lower layer
 252  */
 253
 254 static int
 255 ng_l2cap_lower_rcvmsg(node_p node, item_p item, hook_p lasthook)
 256 {
 257         ng_l2cap_p       l2cap = (ng_l2cap_p) NG_NODE_PRIVATE(node);
 258         struct ng_mesg  *msg = NGI_MSG(item); /* item still has message */
 259         int              error = 0;
 260
 261         switch (msg->header.typecookie) {
 262         case NGM_HCI_COOKIE:
 263                 switch (msg->header.cmd) {
 264                 /* HCI node is ready */
 265                 case NGM_HCI_NODE_UP: {
 266                         ng_hci_node_up_ep       *ep = NULL;
 267
 268                         if (msg->header.arglen != sizeof(*ep))
 269                                 error = EMSGSIZE;
 270                         else {
 271                                 ep = (ng_hci_node_up_ep *)(msg->data);
 272
 273                                 NG_L2CAP_INFO(
 274 "%s: %s - HCI node is up, bdaddr: %x:%x:%x:%x:%x:%x, " \
 275 "pkt_size=%d bytes, num_pkts=%d\n",     __func__, NG_NODE_NAME(l2cap->node),
 276                                         ep->bdaddr.b[5], ep->bdaddr.b[4],
 277                                         ep->bdaddr.b[3], ep->bdaddr.b[2],
 278                                         ep->bdaddr.b[1], ep->bdaddr.b[0],
 279                                         ep->pkt_size, ep->num_pkts);
 280
 281                                 bcopy(&ep->bdaddr, &l2cap->bdaddr,
 282                                         sizeof(l2cap->bdaddr));
 283                                 l2cap->pkt_size = ep->pkt_size;
 284                                 l2cap->num_pkts = ep->num_pkts;
 285
 286                                 /* Notify upper layers */
 287                                 ng_l2cap_send_hook_info(l2cap->node,
 288                                         l2cap->l2c, NULL, 0);
 289                                 ng_l2cap_send_hook_info(l2cap->node,
 290                                         l2cap->ctl, NULL, 0);
 291                         }
 292                         } break;
 293
 294                 case NGM_HCI_SYNC_CON_QUEUE: {
 295                         ng_hci_sync_con_queue_ep        *ep = NULL;
 296                         ng_l2cap_con_p                   con = NULL;
 297
 298                         if (msg->header.arglen != sizeof(*ep))
 299                                 error = EMSGSIZE;
 300                         else {
 301                                 ep = (ng_hci_sync_con_queue_ep *)(msg->data);
 302                                 con = ng_l2cap_con_by_handle(l2cap,
 303                                                         ep->con_handle);
 304                                 if (con == NULL)
 305                                         break;
 306
 307                                 NG_L2CAP_INFO(
 308 "%s: %s - sync HCI connection queue, con_handle=%d, pending=%d, completed=%d\n",
 309                                          __func__, NG_NODE_NAME(l2cap->node),
 310                                         ep->con_handle, con->pending,
 311                                         ep->completed);
 312
 313                                 con->pending -= ep->completed;
 314                                 if (con->pending < 0) {
 315                                         NG_L2CAP_WARN(
 316 "%s: %s - pending packet counter is out of sync! " \
 317 "con_handle=%d, pending=%d, completed=%d\n",    __func__,
 318                                                 NG_NODE_NAME(l2cap->node),
 319                                                 con->con_handle, con->pending,
 320                                                 ep->completed);
 321
 322                                         con->pending = 0;
 323                                 }
 324
 325                                 ng_l2cap_lp_deliver(con);
 326                         }
 327                         } break;
 328
 329                 /* LP_ConnectCfm[Neg] */
 330                 case NGM_HCI_LP_CON_CFM:
 331                         error = ng_l2cap_lp_con_cfm(l2cap, msg);
 332                         break;
 333
 334                 /* LP_ConnectInd */
 335                 case NGM_HCI_LP_CON_IND:
 336                         error = ng_l2cap_lp_con_ind(l2cap, msg);
 337                         break;
 338
 339                 /* LP_DisconnectInd */
 340                 case NGM_HCI_LP_DISCON_IND:
 341                         error = ng_l2cap_lp_discon_ind(l2cap, msg);
 342                         break;
 343
 344                 /* LP_QoSSetupCfm[Neg] */
 345                 case NGM_HCI_LP_QOS_CFM:
 346                         error = ng_l2cap_lp_qos_cfm(l2cap, msg);
 347                         break;
 348
 349                 /* LP_OoSViolationInd */
 350                 case NGM_HCI_LP_QOS_IND:
 351                         error = ng_l2cap_lp_qos_ind(l2cap, msg);
 352                         break;
 353
 354                 default:
 355                         error = EINVAL;
 356                         break;
 357                 }
 358                 break;
 359
 360         default:
 361                 return (ng_l2cap_default_rcvmsg(node, item, lasthook));
 362                 /* NOT REACHED */
 363         }
 364
 365         NG_FREE_ITEM(item);
 366
 367         return (error);
 368 } /* ng_l2cap_lower_rcvmsg */
 369
 370 /*
 371  * Process control message from upper layer
 372  */
 373
 374 static int
 375 ng_l2cap_upper_rcvmsg(node_p node, item_p item, hook_p lasthook)
 376 {
 377         ng_l2cap_p       l2cap = (ng_l2cap_p) NG_NODE_PRIVATE(node);
 378         struct ng_mesg  *msg = NGI_MSG(item); /* item still has message */
 379         int              error = 0;
 380
 381         switch (msg->header.typecookie) {
 382         case NGM_L2CAP_COOKIE:
 383                 switch (msg->header.cmd) {
 384                 /* L2CA_Connect */
 385                 case NGM_L2CAP_L2CA_CON:
 386                         error = ng_l2cap_l2ca_con_req(l2cap, msg);
 387                         break;
 388
 389                 /* L2CA_ConnectRsp */
 390                 case NGM_L2CAP_L2CA_CON_RSP:
 391                         error = ng_l2cap_l2ca_con_rsp_req(l2cap, msg);
 392                         break;
 393
 394                 /* L2CA_Config */
 395                 case NGM_L2CAP_L2CA_CFG:
 396                         error = ng_l2cap_l2ca_cfg_req(l2cap, msg);
 397                         break;
 398
 399                 /* L2CA_ConfigRsp */
 400                 case NGM_L2CAP_L2CA_CFG_RSP:
 401                         error = ng_l2cap_l2ca_cfg_rsp_req(l2cap, msg);
 402                         break;
 403
 404                 /* L2CA_Disconnect */
 405                 case NGM_L2CAP_L2CA_DISCON:
 406                         error = ng_l2cap_l2ca_discon_req(l2cap, msg);
 407                         break;
 408
 409                 /* L2CA_GroupCreate */
 410                 case NGM_L2CAP_L2CA_GRP_CREATE:
 411                         error = ng_l2cap_l2ca_grp_create(l2cap, msg);
 412                         break;
 413
 414                 /* L2CA_GroupClose */
 415                 case NGM_L2CAP_L2CA_GRP_CLOSE:
 416                         error = ng_l2cap_l2ca_grp_close(l2cap, msg);
 417                         break;
 418
 419                 /* L2CA_GroupAddMember */
 420                 case NGM_L2CAP_L2CA_GRP_ADD_MEMBER:
 421                         error = ng_l2cap_l2ca_grp_add_member_req(l2cap, msg);
 422                         break;
 423
 424                 /* L2CA_GroupDeleteMember */
 425                 case NGM_L2CAP_L2CA_GRP_REM_MEMBER:
 426                         error = ng_l2cap_l2ca_grp_rem_member(l2cap, msg);
 427                         break;
 428
 429                 /* L2CA_GroupMembership */
 430                 case NGM_L2CAP_L2CA_GRP_MEMBERSHIP:
 431                         error = ng_l2cap_l2ca_grp_get_members(l2cap, msg);
 432                         break;
 433
 434                 /* L2CA_Ping */
 435                 case NGM_L2CAP_L2CA_PING:
 436                         error = ng_l2cap_l2ca_ping_req(l2cap, msg);
 437                         break;
 438
 439                 /* L2CA_GetInfo */
 440                 case NGM_L2CAP_L2CA_GET_INFO:
 441                         error = ng_l2cap_l2ca_get_info_req(l2cap, msg);
 442                         break;
 443
 444                 /* L2CA_EnableCLT */
 445                 case NGM_L2CAP_L2CA_ENABLE_CLT:
 446                         error = ng_l2cap_l2ca_enable_clt(l2cap, msg);
 447                         break;
 448
 449                 default:
 450                         return (ng_l2cap_default_rcvmsg(node, item, lasthook));
 451                         /* NOT REACHED */
 452                 }
 453                 break;
 454
 455         default:
 456                 return (ng_l2cap_default_rcvmsg(node, item, lasthook));
 457                 /* NOT REACHED */
 458         }
 459
 460         NG_FREE_ITEM(item);
 461
 462         return (error);
 463 } /* ng_l2cap_upper_rcvmsg */
 464
 465 /*
 466  * Default control message processing routine
 467  */
 468
 469 static int
 470 ng_l2cap_default_rcvmsg(node_p node, item_p item, hook_p lasthook)
 471 {
 472         ng_l2cap_p       l2cap = (ng_l2cap_p) NG_NODE_PRIVATE(node);
 473         struct ng_mesg  *msg = NULL, *rsp = NULL;
 474         int              error = 0;
 475
 476         /* Detach and process message */
 477         NGI_GET_MSG(item, msg);
 478
 479         switch (msg->header.typecookie) {
 480         case NGM_GENERIC_COOKIE:
 481                 switch (msg->header.cmd) {
 482                 case NGM_TEXT_STATUS:
 483                         NG_MKRESPONSE(rsp, msg, NG_TEXTRESPONSE, M_NOWAIT);
 484                         if (rsp == NULL)
 485                                 error = ENOMEM;
 486                         else
 487                                 snprintf(rsp->data, NG_TEXTRESPONSE,
 488                                         "bdaddr %x:%x:%x:%x:%x:%x, " \
 489                                         "pkt_size %d\n" \
 490                                         "Hooks %s %s %s\n" \
 491                                         "Flags %#x\n",
 492                                         l2cap->bdaddr.b[5], l2cap->bdaddr.b[4],
 493                                         l2cap->bdaddr.b[3], l2cap->bdaddr.b[2],
 494                                         l2cap->bdaddr.b[1], l2cap->bdaddr.b[0],
 495                                         l2cap->pkt_size,
 496                                         (l2cap->hci != NULL)?
 497                                                 NG_L2CAP_HOOK_HCI : "",
 498                                         (l2cap->l2c != NULL)?
 499                                                 NG_L2CAP_HOOK_L2C : "",
 500                                         (l2cap->ctl != NULL)?
 501                                                 NG_L2CAP_HOOK_CTL : "",
 502                                         l2cap->flags);
 503                         break;
 504
 505                 default:
 506                         error = EINVAL;
 507                         break;
 508                 }
 509                 break;
 510
 511         /* Messages from the upper layer or directed to the local node */
 512         case NGM_L2CAP_COOKIE:
 513                 switch (msg->header.cmd) {
 514                 /* Get node flags */
 515                 case NGM_L2CAP_NODE_GET_FLAGS:
 516                         NG_MKRESPONSE(rsp, msg, sizeof(ng_l2cap_node_flags_ep),
 517                                 M_NOWAIT);
 518                         if (rsp == NULL)
 519                                 error = ENOMEM;
 520                         else
 521                                 *((ng_l2cap_node_flags_ep *)(rsp->data)) =
 522                                         l2cap->flags;
 523                         break;
 524
 525                 /* Get node debug */
 526                 case NGM_L2CAP_NODE_GET_DEBUG:
 527                         NG_MKRESPONSE(rsp, msg, sizeof(ng_l2cap_node_debug_ep),
 528                                 M_NOWAIT);
 529                         if (rsp == NULL)
 530                                 error = ENOMEM;
 531                         else
 532                                 *((ng_l2cap_node_debug_ep *)(rsp->data)) =
 533                                         l2cap->debug;
 534                         break;
 535
 536                 /* Set node debug */
 537                 case NGM_L2CAP_NODE_SET_DEBUG:
 538                         if (msg->header.arglen !=
 539                                         sizeof(ng_l2cap_node_debug_ep))
 540                                 error = EMSGSIZE;
 541                         else
 542                                 l2cap->debug =
 543                                         *((ng_l2cap_node_debug_ep *)(msg->data));
 544                         break;
 545
 546                 /* Get connection list */
 547                 case NGM_L2CAP_NODE_GET_CON_LIST: {
 548                         ng_l2cap_con_p                   con = NULL;
 549                         ng_l2cap_node_con_list_ep       *e1 = NULL;
 550                         ng_l2cap_node_con_ep            *e2 = NULL;
 551                         int                              n = 0;
 552
 553                         /* Count number of connections */
 554                         LIST_FOREACH(con, &l2cap->con_list, next)
 555                                 n++;
 556                         if (n > NG_L2CAP_MAX_CON_NUM)
 557                                 n = NG_L2CAP_MAX_CON_NUM;
 558
 559                         /* Prepare response */
 560                         NG_MKRESPONSE(rsp, msg,
 561                                 sizeof(*e1) + n * sizeof(*e2), M_NOWAIT);
 562                         if (rsp == NULL) {
 563                                 error = ENOMEM;
 564                                 break;
 565                         }
 566
 567                         e1 = (ng_l2cap_node_con_list_ep *)(rsp->data);
 568                         e2 = (ng_l2cap_node_con_ep *)(e1 + 1);
 569
 570                         e1->num_connections = n;
 571
 572                         LIST_FOREACH(con, &l2cap->con_list, next) {
 573                                 e2->state = con->state;
 574
 575                                 e2->flags = con->flags;
 576                                 if (con->tx_pkt != NULL)
 577                                         e2->flags |= NG_L2CAP_CON_TX;
 578                                 if (con->rx_pkt != NULL)
 579                                         e2->flags |= NG_L2CAP_CON_RX;
 580
 581                                 e2->pending = con->pending;
 582
 583                                 e2->con_handle = con->con_handle;
 584                                 bcopy(&con->remote, &e2->remote,
 585                                         sizeof(e2->remote));
 586
 587                                 e2 ++;
 588                                 if (--n <= 0)
 589                                         break;
 590                         }
 591                         } break;
 592
 593                 /* Get channel list */
 594                 case NGM_L2CAP_NODE_GET_CHAN_LIST: {
 595                         ng_l2cap_chan_p                  ch = NULL;
 596                         ng_l2cap_node_chan_list_ep      *e1 = NULL;
 597                         ng_l2cap_node_chan_ep           *e2 = NULL;
 598                         int                              n = 0;
 599
 600                         /* Count number of channels */
 601                         LIST_FOREACH(ch, &l2cap->chan_list, next)
 602                                 n ++;
 603                         if (n > NG_L2CAP_MAX_CHAN_NUM)
 604                                 n = NG_L2CAP_MAX_CHAN_NUM;
 605
 606                         /* Prepare response */
 607                         NG_MKRESPONSE(rsp, msg,
 608                                 sizeof(ng_l2cap_node_chan_list_ep) +
 609                                 n * sizeof(ng_l2cap_node_chan_ep), M_NOWAIT);
 610                         if (rsp == NULL) {
 611                                 error = ENOMEM;
 612                                 break;
 613                         }
 614
 615                         e1 = (ng_l2cap_node_chan_list_ep *)(rsp->data);
 616                         e2 = (ng_l2cap_node_chan_ep *)(e1 + 1);
 617
 618                         e1->num_channels = n;
 619
 620                         LIST_FOREACH(ch, &l2cap->chan_list, next) {
 621                                 e2->state = ch->state;
 622
 623                                 e2->scid = ch->scid;
 624                                 e2->dcid = ch->dcid;
 625
 626                                 e2->imtu = ch->imtu;
 627                                 e2->omtu = ch->omtu;
 628
 629                                 e2->psm = ch->psm;
 630                                 bcopy(&ch->con->remote, &e2->remote,
 631                                         sizeof(e2->remote));
 632
 633                                 e2 ++;
 634                                 if (--n <= 0)
 635                                         break;
 636                         }
 637                         } break;
 638
 639                 case NGM_L2CAP_NODE_GET_AUTO_DISCON_TIMO:
 640                         NG_MKRESPONSE(rsp, msg,
 641                                 sizeof(ng_l2cap_node_auto_discon_ep), M_NOWAIT);
 642                         if (rsp == NULL)
 643                                 error = ENOMEM;
 644                         else
 645                                 *((ng_l2cap_node_auto_discon_ep *)(rsp->data)) =
 646                                         l2cap->discon_timo;
 647                         break;
 648
 649                 case NGM_L2CAP_NODE_SET_AUTO_DISCON_TIMO:
 650                         if (msg->header.arglen !=
 651                                         sizeof(ng_l2cap_node_auto_discon_ep))
 652                                 error = EMSGSIZE;
 653                         else
 654                                 l2cap->discon_timo =
 655                                         *((ng_l2cap_node_auto_discon_ep *)
 656                                                         (msg->data));
 657                         break;
 658
 659                 default:
 660                         error = EINVAL;
 661                         break;
 662                 }
 663                 break;
 664
 665         default:
 666                 error = EINVAL;
 667                 break;
 668         }
 669
 670         NG_RESPOND_MSG(error, node, item, rsp);
 671         NG_FREE_MSG(msg);
 672
 673         return (error);
 674 } /* ng_l2cap_rcvmsg */
 675
 676 /*
 677  * Process data packet from one of our hooks.
 678  *
 679  * From the HCI hook we expect to receive ACL data packets. ACL data packets
 680  * gets re-assembled into one L2CAP packet (according to length) and then gets
 681  * processed.
 682  *
 683  * NOTE: We expect to receive L2CAP packet header in the first fragment.
 684  *       Otherwise we WILL NOT be able to get length of the L2CAP packet.
 685  *
 686  * Signaling L2CAP packets (destination channel ID == 0x1) are processed within
 687  * the node. Connectionless data packets (destination channel ID == 0x2) will
 688  * be forwarded to appropriate upstream hook unless it is not connected or
 689  * connectionless traffic for the specified PSM was disabled.
 690  *
 691  * From the upstream hooks we expect to receive data packets. These data
 692  * packets will be converted into L2CAP data packets. The length of each
 693  * L2CAP packet must not exceed channel's omtu (our peer's imtu). Then
 694  * these L2CAP packets will be converted to ACL data packets (according to
 695  * HCI layer MTU) and sent to lower layer.
 696  *
 697  * No data is expected from the control hook.
 698  */
 699
 700 static int
 701 ng_l2cap_rcvdata(hook_p hook, item_p item)
 702 {
 703         ng_l2cap_p       l2cap = (ng_l2cap_p) NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 704         struct mbuf     *m = NULL;
 705         int              error = 0;
 706
 707         /* Detach mbuf, discard item and process data */
 708         NGI_GET_M(item, m);
 709         NG_FREE_ITEM(item);
 710
 711         if (hook == l2cap->hci)
 712                 error = ng_l2cap_lp_receive(l2cap, m);
 713         else if (hook == l2cap->l2c)
 714                 error = ng_l2cap_l2ca_write_req(l2cap, m);
 715         else {
 716                 NG_FREE_M(m);
 717                 error = EINVAL;
 718         }
 719
 720         return (error);
 721 } /* ng_l2cap_rcvdata */
 722
 723 /*
 724  * Clean all connections, channels and commands for the L2CAP node
 725  */
 726
 727 static void
 728 ng_l2cap_cleanup(ng_l2cap_p l2cap)
 729 {
 730         ng_l2cap_con_p  con = NULL;
 731
 732         /* Clean up connection and channels */
 733         while (!LIST_EMPTY(&l2cap->con_list)) {
 734                 con = LIST_FIRST(&l2cap->con_list);
 735
 736                 if (con->flags & NG_L2CAP_CON_LP_TIMO)
 737                         ng_l2cap_lp_untimeout(con);
 738                 else if (con->flags & NG_L2CAP_CON_AUTO_DISCON_TIMO)
 739                         ng_l2cap_discon_untimeout(con);
 740
 741                 /* Connection terminated by local host */
 742                 ng_l2cap_con_fail(con, 0x16);
 743         }
 744 } /* ng_l2cap_cleanup */
 745
 746 /*
 747  * Destroy all channels that use specified upstream hook
 748  */
 749
 750 static void
 751 ng_l2cap_destroy_channels(ng_l2cap_p l2cap)
 752 {
 753         while (!LIST_EMPTY(&l2cap->chan_list))
 754                 ng_l2cap_free_chan(LIST_FIRST(&l2cap->chan_list));
 755 } /* ng_l2cap_destroy_channels_by_hook */
 756