1 /*
2 * ng_l2cap_misc.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_misc.c,v 1.5 2003/09/08 19:11:45 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/bluetooth/include/ng_bluetooth.h>
43 #include <netgraph/bluetooth/include/ng_hci.h>
44 #include <netgraph/bluetooth/include/ng_l2cap.h>
45 #include <netgraph/bluetooth/l2cap/ng_l2cap_var.h>
46 #include <netgraph/bluetooth/l2cap/ng_l2cap_cmds.h>
47 #include <netgraph/bluetooth/l2cap/ng_l2cap_evnt.h>
48 #include <netgraph/bluetooth/l2cap/ng_l2cap_llpi.h>
49 #include <netgraph/bluetooth/l2cap/ng_l2cap_ulpi.h>
50 #include <netgraph/bluetooth/l2cap/ng_l2cap_misc.h>
51
52 static u_int16_t ng_l2cap_get_cid (ng_l2cap_p, int);
53
54 /******************************************************************************
55 ******************************************************************************
56 ** Utility routines
57 ******************************************************************************
58 ******************************************************************************/
59
60 /*
61 * Send hook information to the upper layer
62 */
63
64 void
ng_l2cap_send_hook_info(node_p node,hook_p hook,void * arg1,int arg2)65 ng_l2cap_send_hook_info(node_p node, hook_p hook, void *arg1, int arg2)
66 {
67 ng_l2cap_p l2cap = NULL;
68 struct ng_mesg *msg = NULL;
69 int error = 0;
70 ng_l2cap_node_hook_info_ep *ep ;
71
72 if (node == NULL || NG_NODE_NOT_VALID(node) ||
73 hook == NULL || NG_HOOK_NOT_VALID(hook))
74 return;
75
76 l2cap = (ng_l2cap_p) NG_NODE_PRIVATE(node);
77 if (l2cap->hci == NULL || NG_HOOK_NOT_VALID(l2cap->hci) ||
78 bcmp(&l2cap->bdaddr, NG_HCI_BDADDR_ANY, sizeof(l2cap->bdaddr)) == 0)
79 return;
80
81 NG_MKMESSAGE(msg, NGM_L2CAP_COOKIE, NGM_L2CAP_NODE_HOOK_INFO,
82 sizeof(*ep), M_NOWAIT);
83
84 if (msg != NULL) {
85 ep = (ng_l2cap_node_hook_info_ep *) &msg->data;
86 bcopy(&l2cap->bdaddr, &ep->addr, sizeof(bdaddr_t));
87 NG_SEND_MSG_HOOK(error, node, msg, hook, 0);
88 } else
89 error = ENOMEM;
90
91 if (error != 0)
92 NG_L2CAP_INFO(
93 "%s: %s - failed to send HOOK_INFO message to hook \"%s\", error=%d\n",
94 __func__, NG_NODE_NAME(l2cap->node), NG_HOOK_NAME(hook),
95 error);
96 } /* ng_l2cap_send_hook_info */
97
98 /*
99 * Create new connection descriptor for the "remote" unit.
100 * Will link connection descriptor to the l2cap node.
101 */
102
103 ng_l2cap_con_p
ng_l2cap_new_con(ng_l2cap_p l2cap,bdaddr_p bdaddr,int type)104 ng_l2cap_new_con(ng_l2cap_p l2cap, bdaddr_p bdaddr, int type)
105 {
106 static int fake_con_handle = 0x0f00;
107 ng_l2cap_con_p con = NULL;
108
109 /* Create new connection descriptor */
110 con = malloc(sizeof(*con), M_NETGRAPH_L2CAP,
111 M_NOWAIT|M_ZERO);
112 if (con == NULL)
113 return (NULL);
114
115 con->l2cap = l2cap;
116 con->state = NG_L2CAP_CON_CLOSED;
117 con->encryption = 0;
118 /*
119 * XXX
120 *
121 * Assign fake connection handle to the connection descriptor.
122 * Bluetooth specification marks 0x0f00 - 0x0fff connection
123 * handles as reserved. We need this fake connection handles
124 * for timeouts. Connection handle will be passed as argument
125 * to timeout so when timeout happens we can find the right
126 * connection descriptor. We can not pass pointers, because
127 * timeouts are external (to Netgraph) events and there might
128 * be a race when node/hook goes down and timeout event already
129 * went into node's queue
130 */
131
132 con->con_handle = fake_con_handle ++;
133 if (fake_con_handle > 0x0fff)
134 fake_con_handle = 0x0f00;
135
136 bcopy(bdaddr, &con->remote, sizeof(con->remote));
137 con->linktype = type;
138 ng_callout_init(&con->con_timo);
139
140 con->ident = NG_L2CAP_FIRST_IDENT - 1;
141 TAILQ_INIT(&con->cmd_list);
142
143 /* Link connection */
144 LIST_INSERT_HEAD(&l2cap->con_list, con, next);
145
146 return (con);
147 } /* ng_l2cap_new_con */
148
149 /*
150 * Add reference to the connection descriptor
151 */
152
153 void
ng_l2cap_con_ref(ng_l2cap_con_p con)154 ng_l2cap_con_ref(ng_l2cap_con_p con)
155 {
156 con->refcnt ++;
157
158 if (con->flags & NG_L2CAP_CON_AUTO_DISCON_TIMO) {
159 if ((con->state != NG_L2CAP_CON_OPEN) ||
160 (con->flags & NG_L2CAP_CON_OUTGOING) == 0)
161 panic(
162 "%s: %s - bad auto disconnect timeout, state=%d, flags=%#x\n",
163 __func__, NG_NODE_NAME(con->l2cap->node),
164 con->state, con->flags);
165
166 ng_l2cap_discon_untimeout(con);
167 }
168 } /* ng_l2cap_con_ref */
169
170 /*
171 * Remove reference from the connection descriptor
172 */
173
174 void
ng_l2cap_con_unref(ng_l2cap_con_p con)175 ng_l2cap_con_unref(ng_l2cap_con_p con)
176 {
177 con->refcnt --;
178
179 if (con->refcnt < 0)
180 panic(
181 "%s: %s - con->refcnt < 0\n", __func__, NG_NODE_NAME(con->l2cap->node));
182
183 /*
184 * Set auto disconnect timer only if the following conditions are met:
185 * 1) we have no reference on the connection
186 * 2) connection is in OPEN state
187 * 3) it is an outgoing connection
188 * 4) disconnect timeout > 0
189 * 5) connection is not dying
190 */
191
192 if ((con->refcnt == 0) &&
193 (con->state == NG_L2CAP_CON_OPEN) &&
194 (con->flags & NG_L2CAP_CON_OUTGOING) &&
195 (con->l2cap->discon_timo > 0) &&
196 ((con->flags & NG_L2CAP_CON_DYING) == 0))
197 ng_l2cap_discon_timeout(con);
198 } /* ng_l2cap_con_unref */
199
200 /*
201 * Set auto disconnect timeout
202 * XXX FIXME: check return code from ng_callout
203 */
204
205 int
ng_l2cap_discon_timeout(ng_l2cap_con_p con)206 ng_l2cap_discon_timeout(ng_l2cap_con_p con)
207 {
208 if (con->flags & (NG_L2CAP_CON_LP_TIMO|NG_L2CAP_CON_AUTO_DISCON_TIMO))
209 panic(
210 "%s: %s - invalid timeout, state=%d, flags=%#x\n",
211 __func__, NG_NODE_NAME(con->l2cap->node),
212 con->state, con->flags);
213
214 con->flags |= NG_L2CAP_CON_AUTO_DISCON_TIMO;
215 ng_callout(&con->con_timo, con->l2cap->node, NULL,
216 con->l2cap->discon_timo * hz,
217 ng_l2cap_process_discon_timeout, NULL,
218 con->con_handle);
219
220 return (0);
221 } /* ng_l2cap_discon_timeout */
222
223 /*
224 * Unset auto disconnect timeout
225 */
226
227 int
ng_l2cap_discon_untimeout(ng_l2cap_con_p con)228 ng_l2cap_discon_untimeout(ng_l2cap_con_p con)
229 {
230 if (!(con->flags & NG_L2CAP_CON_AUTO_DISCON_TIMO))
231 panic(
232 "%s: %s - no disconnect timeout, state=%d, flags=%#x\n",
233 __func__, NG_NODE_NAME(con->l2cap->node),
234 con->state, con->flags);
235
236 if (ng_uncallout(&con->con_timo, con->l2cap->node) == 0)
237 return (ETIMEDOUT);
238
239 con->flags &= ~NG_L2CAP_CON_AUTO_DISCON_TIMO;
240
241 return (0);
242 } /* ng_l2cap_discon_untimeout */
243
244 /*
245 * Free connection descriptor. Will unlink connection and free everything.
246 */
247
248 void
ng_l2cap_free_con(ng_l2cap_con_p con)249 ng_l2cap_free_con(ng_l2cap_con_p con)
250 {
251 ng_l2cap_chan_p f = NULL, n = NULL;
252
253 con->state = NG_L2CAP_CON_CLOSED;
254
255 while (con->tx_pkt != NULL) {
256 struct mbuf *m = con->tx_pkt->m_nextpkt;
257
258 m_freem(con->tx_pkt);
259 con->tx_pkt = m;
260 }
261
262 NG_FREE_M(con->rx_pkt);
263
264 for (f = LIST_FIRST(&con->l2cap->chan_list); f != NULL; ) {
265 n = LIST_NEXT(f, next);
266
267 if (f->con == con)
268 ng_l2cap_free_chan(f);
269
270 f = n;
271 }
272
273 while (!TAILQ_EMPTY(&con->cmd_list)) {
274 ng_l2cap_cmd_p cmd = TAILQ_FIRST(&con->cmd_list);
275
276 ng_l2cap_unlink_cmd(cmd);
277 if (cmd->flags & NG_L2CAP_CMD_PENDING)
278 ng_l2cap_command_untimeout(cmd);
279 ng_l2cap_free_cmd(cmd);
280 }
281
282 if (con->flags & (NG_L2CAP_CON_AUTO_DISCON_TIMO|NG_L2CAP_CON_LP_TIMO))
283 panic(
284 "%s: %s - timeout pending! state=%d, flags=%#x\n",
285 __func__, NG_NODE_NAME(con->l2cap->node),
286 con->state, con->flags);
287
288 LIST_REMOVE(con, next);
289
290 bzero(con, sizeof(*con));
291 free(con, M_NETGRAPH_L2CAP);
292 } /* ng_l2cap_free_con */
293
294 /*
295 * Get connection by "remote" address
296 */
297
298 ng_l2cap_con_p
ng_l2cap_con_by_addr(ng_l2cap_p l2cap,bdaddr_p bdaddr,unsigned int type)299 ng_l2cap_con_by_addr(ng_l2cap_p l2cap, bdaddr_p bdaddr, unsigned int type)
300 {
301 ng_l2cap_con_p con = NULL;
302
303 LIST_FOREACH(con, &l2cap->con_list, next)
304 if ((bcmp(bdaddr, &con->remote, sizeof(con->remote)) == 0)&&
305 (con->linktype == type))
306 break;
307
308 return (con);
309 } /* ng_l2cap_con_by_addr */
310
311 /*
312 * Get connection by "handle"
313 */
314
315 ng_l2cap_con_p
ng_l2cap_con_by_handle(ng_l2cap_p l2cap,u_int16_t con_handle)316 ng_l2cap_con_by_handle(ng_l2cap_p l2cap, u_int16_t con_handle)
317 {
318 ng_l2cap_con_p con = NULL;
319
320 LIST_FOREACH(con, &l2cap->con_list, next)
321 if (con->con_handle == con_handle)
322 break;
323
324 return (con);
325 } /* ng_l2cap_con_by_handle */
326
327 /*
328 * Allocate new L2CAP channel descriptor on "con" connection with "psm".
329 * Will link the channel to the l2cap node
330 */
331
332 ng_l2cap_chan_p
ng_l2cap_new_chan(ng_l2cap_p l2cap,ng_l2cap_con_p con,u_int16_t psm,int idtype)333 ng_l2cap_new_chan(ng_l2cap_p l2cap, ng_l2cap_con_p con, u_int16_t psm, int idtype)
334 {
335 ng_l2cap_chan_p ch = NULL;
336
337 ch = malloc(sizeof(*ch), M_NETGRAPH_L2CAP,
338 M_NOWAIT|M_ZERO);
339 if (ch == NULL)
340 return (NULL);
341 if(idtype == NG_L2CAP_L2CA_IDTYPE_ATT){
342 ch->scid = ch->dcid = NG_L2CAP_ATT_CID;
343 }else if(idtype == NG_L2CAP_L2CA_IDTYPE_SMP){
344 ch->scid = ch->dcid = NG_L2CAP_SMP_CID;
345 }else{
346 ch->scid = ng_l2cap_get_cid(l2cap,
347 (con->linktype!= NG_HCI_LINK_ACL));
348 }
349
350 ch->idtype = idtype;
351 if (ch->scid != NG_L2CAP_NULL_CID) {
352 /* Initialize channel */
353 ch->psm = psm;
354 ch->con = con;
355 ch->state = NG_L2CAP_CLOSED;
356
357 /* Set MTU and flow control settings to defaults */
358 ch->imtu = NG_L2CAP_MTU_DEFAULT;
359 bcopy(ng_l2cap_default_flow(), &ch->iflow, sizeof(ch->iflow));
360
361 ch->omtu = NG_L2CAP_MTU_DEFAULT;
362 bcopy(ng_l2cap_default_flow(), &ch->oflow, sizeof(ch->oflow));
363
364 ch->flush_timo = NG_L2CAP_FLUSH_TIMO_DEFAULT;
365 ch->link_timo = NG_L2CAP_LINK_TIMO_DEFAULT;
366
367 LIST_INSERT_HEAD(&l2cap->chan_list, ch, next);
368
369 ng_l2cap_con_ref(con);
370 } else {
371 bzero(ch, sizeof(*ch));
372 free(ch, M_NETGRAPH_L2CAP);
373 ch = NULL;
374 }
375
376 return (ch);
377 } /* ng_l2cap_new_chan */
378
379
380 ng_l2cap_chan_p
ng_l2cap_chan_by_scid(ng_l2cap_p l2cap,u_int16_t scid,int idtype)381 ng_l2cap_chan_by_scid(ng_l2cap_p l2cap, u_int16_t scid, int idtype)
382 {
383 ng_l2cap_chan_p ch = NULL;
384
385 if((idtype == NG_L2CAP_L2CA_IDTYPE_ATT)||
386 (idtype == NG_L2CAP_L2CA_IDTYPE_SMP)){
387 return NULL;
388 }
389
390 LIST_FOREACH(ch, &l2cap->chan_list, next){
391 if((idtype != NG_L2CAP_L2CA_IDTYPE_BREDR)&&
392 (ch->con->linktype == NG_HCI_LINK_ACL ))
393 continue;
394 if((idtype != NG_L2CAP_L2CA_IDTYPE_LE)&&
395 (ch->con->linktype != NG_HCI_LINK_ACL ))
396 continue;
397 if (ch->scid == scid)
398 break;
399 }
400 return (ch);
401 } /* ng_l2cap_chan_by_scid */
402
403 ng_l2cap_chan_p
ng_l2cap_chan_by_conhandle(ng_l2cap_p l2cap,uint16_t scid,u_int16_t con_handle)404 ng_l2cap_chan_by_conhandle(ng_l2cap_p l2cap, uint16_t scid,
405 u_int16_t con_handle)
406 {
407 ng_l2cap_chan_p ch = NULL;
408
409
410 LIST_FOREACH(ch, &l2cap->chan_list, next){
411 if ((ch->scid == scid) &&
412 (ch->con->con_handle == con_handle))
413 break;
414 }
415 return (ch);
416 } /* ng_l2cap_chan_by_scid */
417
418 /*
419 * Free channel descriptor.
420 */
421
422 void
ng_l2cap_free_chan(ng_l2cap_chan_p ch)423 ng_l2cap_free_chan(ng_l2cap_chan_p ch)
424 {
425 ng_l2cap_cmd_p f = NULL, n = NULL;
426
427 f = TAILQ_FIRST(&ch->con->cmd_list);
428
429 while (f != NULL) {
430 n = TAILQ_NEXT(f, next);
431
432 if (f->ch == ch) {
433 ng_l2cap_unlink_cmd(f);
434 if (f->flags & NG_L2CAP_CMD_PENDING)
435 ng_l2cap_command_untimeout(f);
436 ng_l2cap_free_cmd(f);
437 }
438
439 f = n;
440 }
441
442 LIST_REMOVE(ch, next);
443
444 ng_l2cap_con_unref(ch->con);
445
446 bzero(ch, sizeof(*ch));
447 free(ch, M_NETGRAPH_L2CAP);
448 } /* ng_l2cap_free_chan */
449
450 /*
451 * Create new L2CAP command descriptor. WILL NOT add command to the queue.
452 */
453
454 ng_l2cap_cmd_p
ng_l2cap_new_cmd(ng_l2cap_con_p con,ng_l2cap_chan_p ch,u_int8_t ident,u_int8_t code,u_int32_t token)455 ng_l2cap_new_cmd(ng_l2cap_con_p con, ng_l2cap_chan_p ch, u_int8_t ident,
456 u_int8_t code, u_int32_t token)
457 {
458 ng_l2cap_cmd_p cmd = NULL;
459
460 KASSERT((ch == NULL || ch->con == con),
461 ("%s: %s - invalid channel pointer!\n",
462 __func__, NG_NODE_NAME(con->l2cap->node)));
463
464 cmd = malloc(sizeof(*cmd), M_NETGRAPH_L2CAP,
465 M_NOWAIT|M_ZERO);
466 if (cmd == NULL)
467 return (NULL);
468
469 cmd->con = con;
470 cmd->ch = ch;
471 cmd->ident = ident;
472 cmd->code = code;
473 cmd->token = token;
474 ng_callout_init(&cmd->timo);
475
476 return (cmd);
477 } /* ng_l2cap_new_cmd */
478
479 /*
480 * Get pending (i.e. initiated by local side) L2CAP command descriptor by ident
481 */
482
483 ng_l2cap_cmd_p
ng_l2cap_cmd_by_ident(ng_l2cap_con_p con,u_int8_t ident)484 ng_l2cap_cmd_by_ident(ng_l2cap_con_p con, u_int8_t ident)
485 {
486 ng_l2cap_cmd_p cmd = NULL;
487
488 TAILQ_FOREACH(cmd, &con->cmd_list, next) {
489 if ((cmd->flags & NG_L2CAP_CMD_PENDING) && cmd->ident == ident) {
490 KASSERT((cmd->con == con),
491 ("%s: %s - invalid connection pointer!\n",
492 __func__, NG_NODE_NAME(con->l2cap->node)));
493
494 break;
495 }
496 }
497
498 return (cmd);
499 } /* ng_l2cap_cmd_by_ident */
500
501 /*
502 * Set LP timeout
503 * XXX FIXME: check return code from ng_callout
504 */
505
506 int
ng_l2cap_lp_timeout(ng_l2cap_con_p con)507 ng_l2cap_lp_timeout(ng_l2cap_con_p con)
508 {
509 if (con->flags & (NG_L2CAP_CON_LP_TIMO|NG_L2CAP_CON_AUTO_DISCON_TIMO))
510 panic(
511 "%s: %s - invalid timeout, state=%d, flags=%#x\n",
512 __func__, NG_NODE_NAME(con->l2cap->node),
513 con->state, con->flags);
514
515 con->flags |= NG_L2CAP_CON_LP_TIMO;
516 ng_callout(&con->con_timo, con->l2cap->node, NULL,
517 bluetooth_hci_connect_timeout(),
518 ng_l2cap_process_lp_timeout, NULL,
519 con->con_handle);
520
521 return (0);
522 } /* ng_l2cap_lp_timeout */
523
524 /*
525 * Unset LP timeout
526 */
527
528 int
ng_l2cap_lp_untimeout(ng_l2cap_con_p con)529 ng_l2cap_lp_untimeout(ng_l2cap_con_p con)
530 {
531 if (!(con->flags & NG_L2CAP_CON_LP_TIMO))
532 panic(
533 "%s: %s - no LP connection timeout, state=%d, flags=%#x\n",
534 __func__, NG_NODE_NAME(con->l2cap->node),
535 con->state, con->flags);
536
537 if (ng_uncallout(&con->con_timo, con->l2cap->node) == 0)
538 return (ETIMEDOUT);
539
540 con->flags &= ~NG_L2CAP_CON_LP_TIMO;
541
542 return (0);
543 } /* ng_l2cap_lp_untimeout */
544
545 /*
546 * Set L2CAP command timeout
547 * XXX FIXME: check return code from ng_callout
548 */
549
550 int
ng_l2cap_command_timeout(ng_l2cap_cmd_p cmd,int timo)551 ng_l2cap_command_timeout(ng_l2cap_cmd_p cmd, int timo)
552 {
553 int arg;
554
555 if (cmd->flags & NG_L2CAP_CMD_PENDING)
556 panic(
557 "%s: %s - duplicated command timeout, code=%#x, flags=%#x\n",
558 __func__, NG_NODE_NAME(cmd->con->l2cap->node),
559 cmd->code, cmd->flags);
560
561 arg = ((cmd->ident << 16) | cmd->con->con_handle);
562 cmd->flags |= NG_L2CAP_CMD_PENDING;
563 ng_callout(&cmd->timo, cmd->con->l2cap->node, NULL, timo,
564 ng_l2cap_process_command_timeout, NULL, arg);
565
566 return (0);
567 } /* ng_l2cap_command_timeout */
568
569 /*
570 * Unset L2CAP command timeout
571 */
572
573 int
ng_l2cap_command_untimeout(ng_l2cap_cmd_p cmd)574 ng_l2cap_command_untimeout(ng_l2cap_cmd_p cmd)
575 {
576 if (!(cmd->flags & NG_L2CAP_CMD_PENDING))
577 panic(
578 "%s: %s - no command timeout, code=%#x, flags=%#x\n",
579 __func__, NG_NODE_NAME(cmd->con->l2cap->node),
580 cmd->code, cmd->flags);
581
582 if (ng_uncallout(&cmd->timo, cmd->con->l2cap->node) == 0)
583 return (ETIMEDOUT);
584
585 cmd->flags &= ~NG_L2CAP_CMD_PENDING;
586
587 return (0);
588 } /* ng_l2cap_command_untimeout */
589
590 /*
591 * Prepend "m"buf with "size" bytes
592 */
593
594 struct mbuf *
ng_l2cap_prepend(struct mbuf * m,int size)595 ng_l2cap_prepend(struct mbuf *m, int size)
596 {
597 M_PREPEND(m, size, M_NOWAIT);
598 if (m == NULL || (m->m_len < size && (m = m_pullup(m, size)) == NULL))
599 return (NULL);
600
601 return (m);
602 } /* ng_l2cap_prepend */
603
604 /*
605 * Default flow settings
606 */
607
608 ng_l2cap_flow_p
ng_l2cap_default_flow(void)609 ng_l2cap_default_flow(void)
610 {
611 static ng_l2cap_flow_t default_flow = {
612 /* flags */ 0x0,
613 /* service_type */ NG_HCI_SERVICE_TYPE_BEST_EFFORT,
614 /* token_rate */ 0xffffffff, /* maximum */
615 /* token_bucket_size */ 0xffffffff, /* maximum */
616 /* peak_bandwidth */ 0x00000000, /* maximum */
617 /* latency */ 0xffffffff, /* don't care */
618 /* delay_variation */ 0xffffffff /* don't care */
619 };
620
621 return (&default_flow);
622 } /* ng_l2cap_default_flow */
623
624 /*
625 * Get next available channel ID
626 * XXX FIXME this is *UGLY* but will do for now
627 */
628
629 static u_int16_t
ng_l2cap_get_cid(ng_l2cap_p l2cap,int isle)630 ng_l2cap_get_cid(ng_l2cap_p l2cap,int isle)
631 {
632 u_int16_t cid ;
633 u_int16_t endcid;
634 uint16_t mask;
635 int idtype;
636 if(isle){
637 endcid = l2cap->lecid;
638 /*Assume Last CID is 2^n-1 */
639 mask = NG_L2CAP_LELAST_CID;
640 idtype = NG_L2CAP_L2CA_IDTYPE_LE;
641 }else{
642 endcid = l2cap->cid;
643 /*Assume Last CID is 2^n-1 */
644 mask = NG_L2CAP_LAST_CID;
645 idtype = NG_L2CAP_L2CA_IDTYPE_BREDR;
646 }
647 cid = (endcid+1) & mask;
648
649 if (cid < NG_L2CAP_FIRST_CID)
650 cid = NG_L2CAP_FIRST_CID;
651
652 while (cid != endcid) {
653 if (ng_l2cap_chan_by_scid(l2cap, cid, idtype) == NULL) {
654 if(!isle){
655 l2cap->cid = cid;
656 }else{
657 l2cap->lecid = cid;
658 }
659 return (cid);
660 }
661
662 cid ++;
663 cid &= mask;
664 if (cid < NG_L2CAP_FIRST_CID)
665 cid = NG_L2CAP_FIRST_CID;
666 }
667
668 return (NG_L2CAP_NULL_CID);
669 } /* ng_l2cap_get_cid */
670
671 /*
672 * Get next available command ident
673 * XXX FIXME this is *UGLY* but will do for now
674 */
675
676 u_int8_t
ng_l2cap_get_ident(ng_l2cap_con_p con)677 ng_l2cap_get_ident(ng_l2cap_con_p con)
678 {
679 u_int8_t ident = con->ident + 1;
680
681 if (ident < NG_L2CAP_FIRST_IDENT)
682 ident = NG_L2CAP_FIRST_IDENT;
683
684 while (ident != con->ident) {
685 if (ng_l2cap_cmd_by_ident(con, ident) == NULL) {
686 con->ident = ident;
687
688 return (ident);
689 }
690
691 ident ++;
692 if (ident < NG_L2CAP_FIRST_IDENT)
693 ident = NG_L2CAP_FIRST_IDENT;
694 }
695
696 return (NG_L2CAP_NULL_IDENT);
697 } /* ng_l2cap_get_ident */
698
699