sys/netgraph/bluetooth/l2cap/ng_l2cap_main.c

   1 /*
   2  * ng_l2cap_main.c
   3  */
   4
   5 /*-
   6  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   7  *
   8  * Copyright (c) Maksim Yevmenkin <m_evmenkin@yahoo.com>
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * $Id: ng_l2cap_main.c,v 1.2 2003/04/28 21:44:59 max Exp $
  33  * $FreeBSD$
  34  */
  35
  36 #include <sys/param.h>
  37 #include <sys/systm.h>
  38 #include <sys/kernel.h>
  39 #include <sys/malloc.h>
  40 #include <sys/mbuf.h>
  41 #include <sys/queue.h>
  42 #include <netgraph/ng_message.h>
  43 #include <netgraph/netgraph.h>
  44 #include <netgraph/ng_parse.h>
  45 #include <netgraph/bluetooth/include/ng_bluetooth.h>
  46 #include <netgraph/bluetooth/include/ng_hci.h>
  47 #include <netgraph/bluetooth/include/ng_l2cap.h>
  48 #include <netgraph/bluetooth/l2cap/ng_l2cap_var.h>
  49 #include <netgraph/bluetooth/l2cap/ng_l2cap_cmds.h>
  50 #include <netgraph/bluetooth/l2cap/ng_l2cap_evnt.h>
  51 #include <netgraph/bluetooth/l2cap/ng_l2cap_llpi.h>
  52 #include <netgraph/bluetooth/l2cap/ng_l2cap_ulpi.h>
  53 #include <netgraph/bluetooth/l2cap/ng_l2cap_misc.h>
  54 #include <netgraph/bluetooth/l2cap/ng_l2cap_prse.h>
  55
  56 /******************************************************************************
  57  ******************************************************************************
  58  **  This node implements Link Layer Control and Adaptation Protocol (L2CAP)
  59  ******************************************************************************
  60  ******************************************************************************/
  61
  62 /* MALLOC define */
  63 #ifdef NG_SEPARATE_MALLOC
  64 MALLOC_DEFINE(M_NETGRAPH_L2CAP, "netgraph_l2cap",
  65         "Netgraph Bluetooth L2CAP node");
  66 #else
  67 #define M_NETGRAPH_L2CAP M_NETGRAPH
  68 #endif /* NG_SEPARATE_MALLOC */
  69
  70 /* Netgraph node methods */
  71 static  ng_constructor_t        ng_l2cap_constructor;
  72 static  ng_shutdown_t           ng_l2cap_shutdown;
  73 static  ng_newhook_t            ng_l2cap_newhook;
  74 static  ng_connect_t            ng_l2cap_connect;
  75 static  ng_disconnect_t         ng_l2cap_disconnect;
  76 static  ng_rcvmsg_t             ng_l2cap_lower_rcvmsg;
  77 static  ng_rcvmsg_t             ng_l2cap_upper_rcvmsg;
  78 static  ng_rcvmsg_t             ng_l2cap_default_rcvmsg;
  79 static  ng_rcvdata_t            ng_l2cap_rcvdata;
  80
  81 /* Netgraph node type descriptor */
  82 static  struct ng_type typestruct = {
  83         .version =      NG_ABI_VERSION,
  84         .name =         NG_L2CAP_NODE_TYPE,
  85         .constructor =  ng_l2cap_constructor,
  86         .rcvmsg =       ng_l2cap_default_rcvmsg,
  87         .shutdown =     ng_l2cap_shutdown,
  88         .newhook =      ng_l2cap_newhook,
  89         .connect =      ng_l2cap_connect,
  90         .rcvdata =      ng_l2cap_rcvdata,
  91         .disconnect =   ng_l2cap_disconnect,
  92         .cmdlist =      ng_l2cap_cmdlist,
  93 };
  94 NETGRAPH_INIT(l2cap, &typestruct);
  95 MODULE_VERSION(ng_l2cap, NG_BLUETOOTH_VERSION);
  96 MODULE_DEPEND(ng_l2cap, ng_bluetooth, NG_BLUETOOTH_VERSION,
  97         NG_BLUETOOTH_VERSION, NG_BLUETOOTH_VERSION);
  98
  99 /*****************************************************************************
 100  *****************************************************************************
 101  **                   Netgraph methods implementation
 102  *****************************************************************************
 103  *****************************************************************************/
 104
 105 static void ng_l2cap_cleanup          (ng_l2cap_p);
 106 static void ng_l2cap_destroy_channels (ng_l2cap_p);
 107
 108 /*
 109  * Create new instance of L2CAP node
 110  */
 111
 112 static int
 113 ng_l2cap_constructor(node_p node)
 114 {
 115         ng_l2cap_p      l2cap = NULL;
 116
 117         /* Create new L2CAP node */
 118         l2cap = malloc(sizeof(*l2cap), M_NETGRAPH_L2CAP, M_WAITOK | M_ZERO);
 119
 120         l2cap->node = node;
 121         l2cap->debug = NG_L2CAP_WARN_LEVEL;
 122         l2cap->discon_timo = 5; /* sec */
 123
 124         LIST_INIT(&l2cap->con_list);
 125         LIST_INIT(&l2cap->chan_list);
 126
 127         NG_NODE_SET_PRIVATE(node, l2cap);
 128         NG_NODE_FORCE_WRITER(node);
 129
 130         return (0);
 131 } /* ng_l2cap_constructor */
 132
 133 /*
 134  * Shutdown L2CAP node
 135  */
 136
 137 static int
 138 ng_l2cap_shutdown(node_p node)
 139 {
 140         ng_l2cap_p      l2cap = (ng_l2cap_p) NG_NODE_PRIVATE(node);
 141
 142         NG_NODE_SET_PRIVATE(node, NULL);
 143         NG_NODE_UNREF(node);
 144
 145         /* Clean up L2CAP node. Delete all connection, channels and commands */
 146         l2cap->node = NULL;
 147         ng_l2cap_cleanup(l2cap);
 148
 149         bzero(l2cap, sizeof(*l2cap));
 150         free(l2cap, M_NETGRAPH_L2CAP);
 151
 152         return (0);
 153 } /* ng_l2cap_shutdown */
 154
 155 /*
 156  * Give our OK for a hook to be added. HCI layer is connected to the HCI
 157  * (NG_L2CAP_HOOK_HCI) hook. As per specification L2CAP layer MUST provide
 158  * Procol/Service Multiplexing, so the L2CAP node provides separate hooks
 159  * for SDP (NG_L2CAP_HOOK_SDP), RFCOMM (NG_L2CAP_HOOK_RFCOMM) and TCP
 160  * (NG_L2CAP_HOOK_TCP) protcols. Unknown PSM will be forwarded to
 161  * NG_L2CAP_HOOK_ORPHAN hook. Control node/application is connected to
 162  * control (NG_L2CAP_HOOK_CTL) hook.
 163  */
 164
 165 static int
 166 ng_l2cap_newhook(node_p node, hook_p hook, char const *name)
 167 {
 168         ng_l2cap_p       l2cap = (ng_l2cap_p) NG_NODE_PRIVATE(node);
 169         hook_p          *h = NULL;
 170
 171         if (strcmp(name, NG_L2CAP_HOOK_HCI) == 0)
 172                 h = &l2cap->hci;
 173         else if (strcmp(name, NG_L2CAP_HOOK_L2C) == 0)
 174                 h = &l2cap->l2c;
 175         else if (strcmp(name, NG_L2CAP_HOOK_CTL) == 0)
 176                 h = &l2cap->ctl;
 177         else
 178                 return (EINVAL);
 179
 180         if (*h != NULL)
 181                 return (EISCONN);
 182
 183         *h = hook;
 184
 185         return (0);
 186 } /* ng_l2cap_newhook */
 187
 188 /*
 189  * Give our final OK to connect hook. Nothing to do here.
 190  */
 191
 192 static int
 193 ng_l2cap_connect(hook_p hook)
 194 {
 195         ng_l2cap_p      l2cap = (ng_l2cap_p) NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 196         int             error = 0;
 197
 198         if (hook == l2cap->hci)
 199                 NG_HOOK_SET_RCVMSG(hook, ng_l2cap_lower_rcvmsg);
 200         else
 201         if (hook == l2cap->l2c || hook == l2cap->ctl) {
 202                 NG_HOOK_SET_RCVMSG(hook, ng_l2cap_upper_rcvmsg);
 203
 204                 /* Send delayed notification to the upper layer */
 205                 error = ng_send_fn(l2cap->node, hook, ng_l2cap_send_hook_info,
 206                                 NULL, 0);
 207         } else
 208                 error = EINVAL;
 209
 210         return (error);
 211 } /* ng_l2cap_connect */
 212
 213 /*
 214  * Disconnect the hook. For downstream hook we must notify upper layers.
 215  *
 216  * XXX For upstream hooks this is really ugly :( Hook was disconnected and it
 217  * XXX is now too late to do anything. For now we just clean up our own mess
 218  * XXX and remove all channels that use disconnected upstream hook. If we don't
 219  * XXX do that then L2CAP node can get out of sync with upper layers.
 220  * XXX No notification will be sent to remote peer.
 221  */
 222
 223 static int
 224 ng_l2cap_disconnect(hook_p hook)
 225 {
 226         ng_l2cap_p       l2cap = (ng_l2cap_p) NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 227         hook_p          *h = NULL;
 228
 229         if (hook == l2cap->hci) {
 230                 ng_l2cap_cleanup(l2cap);
 231                 h = &l2cap->hci;
 232         } else
 233         if (hook == l2cap->l2c) {
 234                 ng_l2cap_destroy_channels(l2cap);
 235                 h = &l2cap->l2c;
 236         } else
 237         if (hook == l2cap->ctl)
 238                 h = &l2cap->ctl;
 239         else
 240                 return (EINVAL);
 241
 242         *h = NULL;
 243
 244         /* Shutdown when all hooks are disconnected */
 245         if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0 &&
 246             NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))
 247                 ng_rmnode_self(NG_HOOK_NODE(hook));
 248
 249         return (0);
 250 } /* ng_l2cap_disconnect */
 251
 252 /*
 253  * Process control message from lower layer
 254  */
 255
 256 static int
 257 ng_l2cap_lower_rcvmsg(node_p node, item_p item, hook_p lasthook)
 258 {
 259         ng_l2cap_p       l2cap = (ng_l2cap_p) NG_NODE_PRIVATE(node);
 260         struct ng_mesg  *msg = NGI_MSG(item); /* item still has message */
 261         int              error = 0;
 262
 263         switch (msg->header.typecookie) {
 264         case NGM_HCI_COOKIE:
 265                 switch (msg->header.cmd) {
 266                 /* HCI node is ready */
 267                 case NGM_HCI_NODE_UP: {
 268                         ng_hci_node_up_ep       *ep = NULL;
 269
 270                         if (msg->header.arglen != sizeof(*ep))
 271                                 error = EMSGSIZE;
 272                         else {
 273                                 ep = (ng_hci_node_up_ep *)(msg->data);
 274
 275                                 NG_L2CAP_INFO(
 276 "%s: %s - HCI node is up, bdaddr: %x:%x:%x:%x:%x:%x, " \
 277 "pkt_size=%d bytes, num_pkts=%d\n",     __func__, NG_NODE_NAME(l2cap->node),
 278                                         ep->bdaddr.b[5], ep->bdaddr.b[4],
 279                                         ep->bdaddr.b[3], ep->bdaddr.b[2],
 280                                         ep->bdaddr.b[1], ep->bdaddr.b[0],
 281                                         ep->pkt_size, ep->num_pkts);
 282
 283                                 bcopy(&ep->bdaddr, &l2cap->bdaddr,
 284                                         sizeof(l2cap->bdaddr));
 285                                 l2cap->pkt_size = ep->pkt_size;
 286                                 l2cap->num_pkts = ep->num_pkts;
 287
 288                                 /* Notify upper layers */
 289                                 ng_l2cap_send_hook_info(l2cap->node,
 290                                         l2cap->l2c, NULL, 0);
 291                                 ng_l2cap_send_hook_info(l2cap->node,
 292                                         l2cap->ctl, NULL, 0);
 293                         }
 294                         } break;
 295
 296                 case NGM_HCI_SYNC_CON_QUEUE: {
 297                         ng_hci_sync_con_queue_ep        *ep = NULL;
 298                         ng_l2cap_con_p                   con = NULL;
 299
 300                         if (msg->header.arglen != sizeof(*ep))
 301                                 error = EMSGSIZE;
 302                         else {
 303                                 ep = (ng_hci_sync_con_queue_ep *)(msg->data);
 304                                 con = ng_l2cap_con_by_handle(l2cap,
 305                                                         ep->con_handle);
 306                                 if (con == NULL)
 307                                         break;
 308
 309                                 NG_L2CAP_INFO(
 310 "%s: %s - sync HCI connection queue, con_handle=%d, pending=%d, completed=%d\n",
 311                                          __func__, NG_NODE_NAME(l2cap->node),
 312                                         ep->con_handle, con->pending,
 313                                         ep->completed);
 314
 315                                 con->pending -= ep->completed;
 316                                 if (con->pending < 0) {
 317                                         NG_L2CAP_WARN(
 318 "%s: %s - pending packet counter is out of sync! " \
 319 "con_handle=%d, pending=%d, completed=%d\n",    __func__,
 320                                                 NG_NODE_NAME(l2cap->node),
 321                                                 con->con_handle, con->pending,
 322                                                 ep->completed);
 323
 324                                         con->pending = 0;
 325                                 }
 326
 327                                 ng_l2cap_lp_deliver(con);
 328                         }
 329                         } break;
 330
 331                 /* LP_ConnectCfm[Neg] */
 332                 case NGM_HCI_LP_CON_CFM:
 333                         error = ng_l2cap_lp_con_cfm(l2cap, msg);
 334                         break;
 335
 336                 /* LP_ConnectInd */
 337                 case NGM_HCI_LP_CON_IND:
 338                         error = ng_l2cap_lp_con_ind(l2cap, msg);
 339                         break;
 340
 341                 /* LP_DisconnectInd */
 342                 case NGM_HCI_LP_DISCON_IND:
 343                         error = ng_l2cap_lp_discon_ind(l2cap, msg);
 344                         break;
 345
 346                 /* LP_QoSSetupCfm[Neg] */
 347                 case NGM_HCI_LP_QOS_CFM:
 348                         error = ng_l2cap_lp_qos_cfm(l2cap, msg);
 349                         break;
 350
 351                 /* LP_OoSViolationInd */
 352                 case NGM_HCI_LP_QOS_IND:
 353                         error = ng_l2cap_lp_qos_ind(l2cap, msg);
 354                         break;
 355                 case NGM_HCI_LP_ENC_CHG:
 356                         error = ng_l2cap_lp_enc_change(l2cap, msg);
 357                         break;
 358                 default:
 359                         error = EINVAL;
 360                         break;
 361                 }
 362                 break;
 363
 364         default:
 365                 return (ng_l2cap_default_rcvmsg(node, item, lasthook));
 366                 /* NOT REACHED */
 367         }
 368
 369         NG_FREE_ITEM(item);
 370
 371         return (error);
 372 } /* ng_l2cap_lower_rcvmsg */
 373
 374 /*
 375  * Process control message from upper layer
 376  */
 377
 378 static int
 379 ng_l2cap_upper_rcvmsg(node_p node, item_p item, hook_p lasthook)
 380 {
 381         ng_l2cap_p       l2cap = (ng_l2cap_p) NG_NODE_PRIVATE(node);
 382         struct ng_mesg  *msg = NGI_MSG(item); /* item still has message */
 383         int              error = 0;
 384
 385         switch (msg->header.typecookie) {
 386         case NGM_L2CAP_COOKIE:
 387                 switch (msg->header.cmd) {
 388                 /* L2CA_Connect */
 389                 case NGM_L2CAP_L2CA_CON:
 390                         error = ng_l2cap_l2ca_con_req(l2cap, msg);
 391                         break;
 392
 393                 /* L2CA_ConnectRsp */
 394                 case NGM_L2CAP_L2CA_CON_RSP:
 395                         error = ng_l2cap_l2ca_con_rsp_req(l2cap, msg);
 396                         break;
 397
 398                 /* L2CA_Config */
 399                 case NGM_L2CAP_L2CA_CFG:
 400                         error = ng_l2cap_l2ca_cfg_req(l2cap, msg);
 401                         break;
 402
 403                 /* L2CA_ConfigRsp */
 404                 case NGM_L2CAP_L2CA_CFG_RSP:
 405                         error = ng_l2cap_l2ca_cfg_rsp_req(l2cap, msg);
 406                         break;
 407
 408                 /* L2CA_Disconnect */
 409                 case NGM_L2CAP_L2CA_DISCON:
 410                         error = ng_l2cap_l2ca_discon_req(l2cap, msg);
 411                         break;
 412
 413                 /* L2CA_GroupCreate */
 414                 case NGM_L2CAP_L2CA_GRP_CREATE:
 415                         error = ng_l2cap_l2ca_grp_create(l2cap, msg);
 416                         break;
 417
 418                 /* L2CA_GroupClose */
 419                 case NGM_L2CAP_L2CA_GRP_CLOSE:
 420                         error = ng_l2cap_l2ca_grp_close(l2cap, msg);
 421                         break;
 422
 423                 /* L2CA_GroupAddMember */
 424                 case NGM_L2CAP_L2CA_GRP_ADD_MEMBER:
 425                         error = ng_l2cap_l2ca_grp_add_member_req(l2cap, msg);
 426                         break;
 427
 428                 /* L2CA_GroupDeleteMember */
 429                 case NGM_L2CAP_L2CA_GRP_REM_MEMBER:
 430                         error = ng_l2cap_l2ca_grp_rem_member(l2cap, msg);
 431                         break;
 432
 433                 /* L2CA_GroupMembership */
 434                 case NGM_L2CAP_L2CA_GRP_MEMBERSHIP:
 435                         error = ng_l2cap_l2ca_grp_get_members(l2cap, msg);
 436                         break;
 437
 438                 /* L2CA_Ping */
 439                 case NGM_L2CAP_L2CA_PING:
 440                         error = ng_l2cap_l2ca_ping_req(l2cap, msg);
 441                         break;
 442
 443                 /* L2CA_GetInfo */
 444                 case NGM_L2CAP_L2CA_GET_INFO:
 445                         error = ng_l2cap_l2ca_get_info_req(l2cap, msg);
 446                         break;
 447
 448                 /* L2CA_EnableCLT */
 449                 case NGM_L2CAP_L2CA_ENABLE_CLT:
 450                         error = ng_l2cap_l2ca_enable_clt(l2cap, msg);
 451                         break;
 452
 453                 default:
 454                         return (ng_l2cap_default_rcvmsg(node, item, lasthook));
 455                         /* NOT REACHED */
 456                 }
 457                 break;
 458
 459         default:
 460                 return (ng_l2cap_default_rcvmsg(node, item, lasthook));
 461                 /* NOT REACHED */
 462         }
 463
 464         NG_FREE_ITEM(item);
 465
 466         return (error);
 467 } /* ng_l2cap_upper_rcvmsg */
 468
 469 /*
 470  * Default control message processing routine
 471  */
 472
 473 static int
 474 ng_l2cap_default_rcvmsg(node_p node, item_p item, hook_p lasthook)
 475 {
 476         ng_l2cap_p       l2cap = (ng_l2cap_p) NG_NODE_PRIVATE(node);
 477         struct ng_mesg  *msg = NULL, *rsp = NULL;
 478         int              error = 0;
 479
 480         /* Detach and process message */
 481         NGI_GET_MSG(item, msg);
 482
 483         switch (msg->header.typecookie) {
 484         case NGM_GENERIC_COOKIE:
 485                 switch (msg->header.cmd) {
 486                 case NGM_TEXT_STATUS:
 487                         NG_MKRESPONSE(rsp, msg, NG_TEXTRESPONSE, M_NOWAIT);
 488                         if (rsp == NULL)
 489                                 error = ENOMEM;
 490                         else
 491                                 snprintf(rsp->data, NG_TEXTRESPONSE,
 492                                         "bdaddr %x:%x:%x:%x:%x:%x, " \
 493                                         "pkt_size %d\n" \
 494                                         "Hooks %s %s %s\n" \
 495                                         "Flags %#x\n",
 496                                         l2cap->bdaddr.b[5], l2cap->bdaddr.b[4],
 497                                         l2cap->bdaddr.b[3], l2cap->bdaddr.b[2],
 498                                         l2cap->bdaddr.b[1], l2cap->bdaddr.b[0],
 499                                         l2cap->pkt_size,
 500                                         (l2cap->hci != NULL)?
 501                                                 NG_L2CAP_HOOK_HCI : "",
 502                                         (l2cap->l2c != NULL)?
 503                                                 NG_L2CAP_HOOK_L2C : "",
 504                                         (l2cap->ctl != NULL)?
 505                                                 NG_L2CAP_HOOK_CTL : "",
 506                                         l2cap->flags);
 507                         break;
 508
 509                 default:
 510                         error = EINVAL;
 511                         break;
 512                 }
 513                 break;
 514
 515         /* Messages from the upper layer or directed to the local node */
 516         case NGM_L2CAP_COOKIE:
 517                 switch (msg->header.cmd) {
 518                 /* Get node flags */
 519                 case NGM_L2CAP_NODE_GET_FLAGS:
 520                         NG_MKRESPONSE(rsp, msg, sizeof(ng_l2cap_node_flags_ep),
 521                                 M_NOWAIT);
 522                         if (rsp == NULL)
 523                                 error = ENOMEM;
 524                         else
 525                                 *((ng_l2cap_node_flags_ep *)(rsp->data)) =
 526                                         l2cap->flags;
 527                         break;
 528
 529                 /* Get node debug */
 530                 case NGM_L2CAP_NODE_GET_DEBUG:
 531                         NG_MKRESPONSE(rsp, msg, sizeof(ng_l2cap_node_debug_ep),
 532                                 M_NOWAIT);
 533                         if (rsp == NULL)
 534                                 error = ENOMEM;
 535                         else
 536                                 *((ng_l2cap_node_debug_ep *)(rsp->data)) =
 537                                         l2cap->debug;
 538                         break;
 539
 540                 /* Set node debug */
 541                 case NGM_L2CAP_NODE_SET_DEBUG:
 542                         if (msg->header.arglen !=
 543                                         sizeof(ng_l2cap_node_debug_ep))
 544                                 error = EMSGSIZE;
 545                         else
 546                                 l2cap->debug =
 547                                         *((ng_l2cap_node_debug_ep *)(msg->data));
 548                         break;
 549
 550                 /* Get connection list */
 551                 case NGM_L2CAP_NODE_GET_CON_LIST: {
 552                         ng_l2cap_con_p                   con = NULL;
 553                         ng_l2cap_node_con_list_ep       *e1 = NULL;
 554                         ng_l2cap_node_con_ep            *e2 = NULL;
 555                         int                              n = 0;
 556
 557                         /* Count number of connections */
 558                         LIST_FOREACH(con, &l2cap->con_list, next)
 559                                 n++;
 560                         if (n > NG_L2CAP_MAX_CON_NUM)
 561                                 n = NG_L2CAP_MAX_CON_NUM;
 562
 563                         /* Prepare response */
 564                         NG_MKRESPONSE(rsp, msg,
 565                                 sizeof(*e1) + n * sizeof(*e2), M_NOWAIT);
 566                         if (rsp == NULL) {
 567                                 error = ENOMEM;
 568                                 break;
 569                         }
 570
 571                         e1 = (ng_l2cap_node_con_list_ep *)(rsp->data);
 572                         e2 = (ng_l2cap_node_con_ep *)(e1 + 1);
 573
 574                         e1->num_connections = n;
 575
 576                         LIST_FOREACH(con, &l2cap->con_list, next) {
 577                                 e2->state = con->state;
 578
 579                                 e2->flags = con->flags;
 580                                 if (con->tx_pkt != NULL)
 581                                         e2->flags |= NG_L2CAP_CON_TX;
 582                                 if (con->rx_pkt != NULL)
 583                                         e2->flags |= NG_L2CAP_CON_RX;
 584
 585                                 e2->pending = con->pending;
 586
 587                                 e2->con_handle = con->con_handle;
 588                                 bcopy(&con->remote, &e2->remote,
 589                                         sizeof(e2->remote));
 590
 591                                 e2 ++;
 592                                 if (--n <= 0)
 593                                         break;
 594                         }
 595                         } break;
 596
 597                 /* Get channel list */
 598                 case NGM_L2CAP_NODE_GET_CHAN_LIST: {
 599                         ng_l2cap_chan_p                  ch = NULL;
 600                         ng_l2cap_node_chan_list_ep      *e1 = NULL;
 601                         ng_l2cap_node_chan_ep           *e2 = NULL;
 602                         int                              n = 0;
 603
 604                         /* Count number of channels */
 605                         LIST_FOREACH(ch, &l2cap->chan_list, next)
 606                                 n ++;
 607                         if (n > NG_L2CAP_MAX_CHAN_NUM)
 608                                 n = NG_L2CAP_MAX_CHAN_NUM;
 609
 610                         /* Prepare response */
 611                         NG_MKRESPONSE(rsp, msg,
 612                                 sizeof(ng_l2cap_node_chan_list_ep) +
 613                                 n * sizeof(ng_l2cap_node_chan_ep), M_NOWAIT);
 614                         if (rsp == NULL) {
 615                                 error = ENOMEM;
 616                                 break;
 617                         }
 618
 619                         e1 = (ng_l2cap_node_chan_list_ep *)(rsp->data);
 620                         e2 = (ng_l2cap_node_chan_ep *)(e1 + 1);
 621
 622                         e1->num_channels = n;
 623
 624                         LIST_FOREACH(ch, &l2cap->chan_list, next) {
 625                                 e2->state = ch->state;
 626
 627                                 e2->scid = ch->scid;
 628                                 e2->dcid = ch->dcid;
 629
 630                                 e2->imtu = ch->imtu;
 631                                 e2->omtu = ch->omtu;
 632
 633                                 e2->psm = ch->psm;
 634                                 bcopy(&ch->con->remote, &e2->remote,
 635                                         sizeof(e2->remote));
 636
 637                                 e2 ++;
 638                                 if (--n <= 0)
 639                                         break;
 640                         }
 641                         } break;
 642
 643                 case NGM_L2CAP_NODE_GET_AUTO_DISCON_TIMO:
 644                         NG_MKRESPONSE(rsp, msg,
 645                                 sizeof(ng_l2cap_node_auto_discon_ep), M_NOWAIT);
 646                         if (rsp == NULL)
 647                                 error = ENOMEM;
 648                         else
 649                                 *((ng_l2cap_node_auto_discon_ep *)(rsp->data)) =
 650                                         l2cap->discon_timo;
 651                         break;
 652
 653                 case NGM_L2CAP_NODE_SET_AUTO_DISCON_TIMO:
 654                         if (msg->header.arglen !=
 655                                         sizeof(ng_l2cap_node_auto_discon_ep))
 656                                 error = EMSGSIZE;
 657                         else
 658                                 l2cap->discon_timo =
 659                                         *((ng_l2cap_node_auto_discon_ep *)
 660                                                         (msg->data));
 661                         break;
 662
 663                 default:
 664                         error = EINVAL;
 665                         break;
 666                 }
 667                 break;
 668
 669         default:
 670                 error = EINVAL;
 671                 break;
 672         }
 673
 674         NG_RESPOND_MSG(error, node, item, rsp);
 675         NG_FREE_MSG(msg);
 676
 677         return (error);
 678 } /* ng_l2cap_rcvmsg */
 679
 680 /*
 681  * Process data packet from one of our hooks.
 682  *
 683  * From the HCI hook we expect to receive ACL data packets. ACL data packets
 684  * gets re-assembled into one L2CAP packet (according to length) and then gets
 685  * processed.
 686  *
 687  * NOTE: We expect to receive L2CAP packet header in the first fragment.
 688  *       Otherwise we WILL NOT be able to get length of the L2CAP packet.
 689  *
 690  * Signaling L2CAP packets (destination channel ID == 0x1) are processed within
 691  * the node. Connectionless data packets (destination channel ID == 0x2) will
 692  * be forwarded to appropriate upstream hook unless it is not connected or
 693  * connectionless traffic for the specified PSM was disabled.
 694  *
 695  * From the upstream hooks we expect to receive data packets. These data
 696  * packets will be converted into L2CAP data packets. The length of each
 697  * L2CAP packet must not exceed channel's omtu (our peer's imtu). Then
 698  * these L2CAP packets will be converted to ACL data packets (according to
 699  * HCI layer MTU) and sent to lower layer.
 700  *
 701  * No data is expected from the control hook.
 702  */
 703
 704 static int
 705 ng_l2cap_rcvdata(hook_p hook, item_p item)
 706 {
 707         ng_l2cap_p       l2cap = (ng_l2cap_p) NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 708         struct mbuf     *m = NULL;
 709         int              error = 0;
 710
 711         /* Detach mbuf, discard item and process data */
 712         NGI_GET_M(item, m);
 713         NG_FREE_ITEM(item);
 714
 715         if (hook == l2cap->hci)
 716                 error = ng_l2cap_lp_receive(l2cap, m);
 717         else if (hook == l2cap->l2c)
 718                 error = ng_l2cap_l2ca_write_req(l2cap, m);
 719         else {
 720                 NG_FREE_M(m);
 721                 error = EINVAL;
 722         }
 723
 724         return (error);
 725 } /* ng_l2cap_rcvdata */
 726
 727 /*
 728  * Clean all connections, channels and commands for the L2CAP node
 729  */
 730
 731 static void
 732 ng_l2cap_cleanup(ng_l2cap_p l2cap)
 733 {
 734         ng_l2cap_con_p  con = NULL;
 735
 736         /* Clean up connection and channels */
 737         while (!LIST_EMPTY(&l2cap->con_list)) {
 738                 con = LIST_FIRST(&l2cap->con_list);
 739
 740                 if (con->flags & NG_L2CAP_CON_LP_TIMO)
 741                         ng_l2cap_lp_untimeout(con);
 742                 else if (con->flags & NG_L2CAP_CON_AUTO_DISCON_TIMO)
 743                         ng_l2cap_discon_untimeout(con);
 744
 745                 /* Connection terminated by local host */
 746                 ng_l2cap_con_fail(con, 0x16);
 747         }
 748 } /* ng_l2cap_cleanup */
 749
 750 /*
 751  * Destroy all channels that use specified upstream hook
 752  */
 753
 754 static void
 755 ng_l2cap_destroy_channels(ng_l2cap_p l2cap)
 756 {
 757         while (!LIST_EMPTY(&l2cap->chan_list))
 758                 ng_l2cap_free_chan(LIST_FIRST(&l2cap->chan_list));
 759 } /* ng_l2cap_destroy_channels_by_hook */
 760