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Linux/net/irda/af_irda.c

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  1 /*********************************************************************
  2  *
  3  * Filename:      af_irda.c
  4  * Version:       0.9
  5  * Description:   IrDA sockets implementation
  6  * Status:        Stable
  7  * Author:        Dag Brattli <dagb@cs.uit.no>
  8  * Created at:    Sun May 31 10:12:43 1998
  9  * Modified at:   Sat Dec 25 21:10:23 1999
 10  * Modified by:   Dag Brattli <dag@brattli.net>
 11  * Sources:       af_netroom.c, af_ax25.c, af_rose.c, af_x25.c etc.
 12  *
 13  *     Copyright (c) 1999 Dag Brattli <dagb@cs.uit.no>
 14  *     Copyright (c) 1999-2003 Jean Tourrilhes <jt@hpl.hp.com>
 15  *     All Rights Reserved.
 16  *
 17  *     This program is free software; you can redistribute it and/or
 18  *     modify it under the terms of the GNU General Public License as
 19  *     published by the Free Software Foundation; either version 2 of
 20  *     the License, or (at your option) any later version.
 21  *
 22  *     This program is distributed in the hope that it will be useful,
 23  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 24  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 25  *     GNU General Public License for more details.
 26  *
 27  *     You should have received a copy of the GNU General Public License
 28  *     along with this program; if not, see <http://www.gnu.org/licenses/>.
 29  *
 30  *     Linux-IrDA now supports four different types of IrDA sockets:
 31  *
 32  *     o SOCK_STREAM:    TinyTP connections with SAR disabled. The
 33  *                       max SDU size is 0 for conn. of this type
 34  *     o SOCK_SEQPACKET: TinyTP connections with SAR enabled. TTP may
 35  *                       fragment the messages, but will preserve
 36  *                       the message boundaries
 37  *     o SOCK_DGRAM:     IRDAPROTO_UNITDATA: TinyTP connections with Unitdata
 38  *                       (unreliable) transfers
 39  *                       IRDAPROTO_ULTRA: Connectionless and unreliable data
 40  *
 41  ********************************************************************/
 42 
 43 #include <linux/capability.h>
 44 #include <linux/module.h>
 45 #include <linux/types.h>
 46 #include <linux/socket.h>
 47 #include <linux/sockios.h>
 48 #include <linux/slab.h>
 49 #include <linux/init.h>
 50 #include <linux/net.h>
 51 #include <linux/irda.h>
 52 #include <linux/poll.h>
 53 
 54 #include <asm/ioctls.h>         /* TIOCOUTQ, TIOCINQ */
 55 #include <asm/uaccess.h>
 56 
 57 #include <net/sock.h>
 58 #include <net/tcp_states.h>
 59 
 60 #include <net/irda/af_irda.h>
 61 
 62 static int irda_create(struct net *net, struct socket *sock, int protocol, int kern);
 63 
 64 static const struct proto_ops irda_stream_ops;
 65 static const struct proto_ops irda_seqpacket_ops;
 66 static const struct proto_ops irda_dgram_ops;
 67 
 68 #ifdef CONFIG_IRDA_ULTRA
 69 static const struct proto_ops irda_ultra_ops;
 70 #define ULTRA_MAX_DATA 382
 71 #endif /* CONFIG_IRDA_ULTRA */
 72 
 73 #define IRDA_MAX_HEADER (TTP_MAX_HEADER)
 74 
 75 /*
 76  * Function irda_data_indication (instance, sap, skb)
 77  *
 78  *    Received some data from TinyTP. Just queue it on the receive queue
 79  *
 80  */
 81 static int irda_data_indication(void *instance, void *sap, struct sk_buff *skb)
 82 {
 83         struct irda_sock *self;
 84         struct sock *sk;
 85         int err;
 86 
 87         IRDA_DEBUG(3, "%s()\n", __func__);
 88 
 89         self = instance;
 90         sk = instance;
 91 
 92         err = sock_queue_rcv_skb(sk, skb);
 93         if (err) {
 94                 IRDA_DEBUG(1, "%s(), error: no more mem!\n", __func__);
 95                 self->rx_flow = FLOW_STOP;
 96 
 97                 /* When we return error, TTP will need to requeue the skb */
 98                 return err;
 99         }
100 
101         return 0;
102 }
103 
104 /*
105  * Function irda_disconnect_indication (instance, sap, reason, skb)
106  *
107  *    Connection has been closed. Check reason to find out why
108  *
109  */
110 static void irda_disconnect_indication(void *instance, void *sap,
111                                        LM_REASON reason, struct sk_buff *skb)
112 {
113         struct irda_sock *self;
114         struct sock *sk;
115 
116         self = instance;
117 
118         IRDA_DEBUG(2, "%s(%p)\n", __func__, self);
119 
120         /* Don't care about it, but let's not leak it */
121         if(skb)
122                 dev_kfree_skb(skb);
123 
124         sk = instance;
125         if (sk == NULL) {
126                 IRDA_DEBUG(0, "%s(%p) : BUG : sk is NULL\n",
127                            __func__, self);
128                 return;
129         }
130 
131         /* Prevent race conditions with irda_release() and irda_shutdown() */
132         bh_lock_sock(sk);
133         if (!sock_flag(sk, SOCK_DEAD) && sk->sk_state != TCP_CLOSE) {
134                 sk->sk_state     = TCP_CLOSE;
135                 sk->sk_shutdown |= SEND_SHUTDOWN;
136 
137                 sk->sk_state_change(sk);
138 
139                 /* Close our TSAP.
140                  * If we leave it open, IrLMP put it back into the list of
141                  * unconnected LSAPs. The problem is that any incoming request
142                  * can then be matched to this socket (and it will be, because
143                  * it is at the head of the list). This would prevent any
144                  * listening socket waiting on the same TSAP to get those
145                  * requests. Some apps forget to close sockets, or hang to it
146                  * a bit too long, so we may stay in this dead state long
147                  * enough to be noticed...
148                  * Note : all socket function do check sk->sk_state, so we are
149                  * safe...
150                  * Jean II
151                  */
152                 if (self->tsap) {
153                         irttp_close_tsap(self->tsap);
154                         self->tsap = NULL;
155                 }
156         }
157         bh_unlock_sock(sk);
158 
159         /* Note : once we are there, there is not much you want to do
160          * with the socket anymore, apart from closing it.
161          * For example, bind() and connect() won't reset sk->sk_err,
162          * sk->sk_shutdown and sk->sk_flags to valid values...
163          * Jean II
164          */
165 }
166 
167 /*
168  * Function irda_connect_confirm (instance, sap, qos, max_sdu_size, skb)
169  *
170  *    Connections has been confirmed by the remote device
171  *
172  */
173 static void irda_connect_confirm(void *instance, void *sap,
174                                  struct qos_info *qos,
175                                  __u32 max_sdu_size, __u8 max_header_size,
176                                  struct sk_buff *skb)
177 {
178         struct irda_sock *self;
179         struct sock *sk;
180 
181         self = instance;
182 
183         IRDA_DEBUG(2, "%s(%p)\n", __func__, self);
184 
185         sk = instance;
186         if (sk == NULL) {
187                 dev_kfree_skb(skb);
188                 return;
189         }
190 
191         dev_kfree_skb(skb);
192         // Should be ??? skb_queue_tail(&sk->sk_receive_queue, skb);
193 
194         /* How much header space do we need to reserve */
195         self->max_header_size = max_header_size;
196 
197         /* IrTTP max SDU size in transmit direction */
198         self->max_sdu_size_tx = max_sdu_size;
199 
200         /* Find out what the largest chunk of data that we can transmit is */
201         switch (sk->sk_type) {
202         case SOCK_STREAM:
203                 if (max_sdu_size != 0) {
204                         IRDA_ERROR("%s: max_sdu_size must be 0\n",
205                                    __func__);
206                         return;
207                 }
208                 self->max_data_size = irttp_get_max_seg_size(self->tsap);
209                 break;
210         case SOCK_SEQPACKET:
211                 if (max_sdu_size == 0) {
212                         IRDA_ERROR("%s: max_sdu_size cannot be 0\n",
213                                    __func__);
214                         return;
215                 }
216                 self->max_data_size = max_sdu_size;
217                 break;
218         default:
219                 self->max_data_size = irttp_get_max_seg_size(self->tsap);
220         }
221 
222         IRDA_DEBUG(2, "%s(), max_data_size=%d\n", __func__,
223                    self->max_data_size);
224 
225         memcpy(&self->qos_tx, qos, sizeof(struct qos_info));
226 
227         /* We are now connected! */
228         sk->sk_state = TCP_ESTABLISHED;
229         sk->sk_state_change(sk);
230 }
231 
232 /*
233  * Function irda_connect_indication(instance, sap, qos, max_sdu_size, userdata)
234  *
235  *    Incoming connection
236  *
237  */
238 static void irda_connect_indication(void *instance, void *sap,
239                                     struct qos_info *qos, __u32 max_sdu_size,
240                                     __u8 max_header_size, struct sk_buff *skb)
241 {
242         struct irda_sock *self;
243         struct sock *sk;
244 
245         self = instance;
246 
247         IRDA_DEBUG(2, "%s(%p)\n", __func__, self);
248 
249         sk = instance;
250         if (sk == NULL) {
251                 dev_kfree_skb(skb);
252                 return;
253         }
254 
255         /* How much header space do we need to reserve */
256         self->max_header_size = max_header_size;
257 
258         /* IrTTP max SDU size in transmit direction */
259         self->max_sdu_size_tx = max_sdu_size;
260 
261         /* Find out what the largest chunk of data that we can transmit is */
262         switch (sk->sk_type) {
263         case SOCK_STREAM:
264                 if (max_sdu_size != 0) {
265                         IRDA_ERROR("%s: max_sdu_size must be 0\n",
266                                    __func__);
267                         kfree_skb(skb);
268                         return;
269                 }
270                 self->max_data_size = irttp_get_max_seg_size(self->tsap);
271                 break;
272         case SOCK_SEQPACKET:
273                 if (max_sdu_size == 0) {
274                         IRDA_ERROR("%s: max_sdu_size cannot be 0\n",
275                                    __func__);
276                         kfree_skb(skb);
277                         return;
278                 }
279                 self->max_data_size = max_sdu_size;
280                 break;
281         default:
282                 self->max_data_size = irttp_get_max_seg_size(self->tsap);
283         }
284 
285         IRDA_DEBUG(2, "%s(), max_data_size=%d\n", __func__,
286                    self->max_data_size);
287 
288         memcpy(&self->qos_tx, qos, sizeof(struct qos_info));
289 
290         skb_queue_tail(&sk->sk_receive_queue, skb);
291         sk->sk_state_change(sk);
292 }
293 
294 /*
295  * Function irda_connect_response (handle)
296  *
297  *    Accept incoming connection
298  *
299  */
300 static void irda_connect_response(struct irda_sock *self)
301 {
302         struct sk_buff *skb;
303 
304         IRDA_DEBUG(2, "%s()\n", __func__);
305 
306         skb = alloc_skb(TTP_MAX_HEADER + TTP_SAR_HEADER, GFP_KERNEL);
307         if (skb == NULL) {
308                 IRDA_DEBUG(0, "%s() Unable to allocate sk_buff!\n",
309                            __func__);
310                 return;
311         }
312 
313         /* Reserve space for MUX_CONTROL and LAP header */
314         skb_reserve(skb, IRDA_MAX_HEADER);
315 
316         irttp_connect_response(self->tsap, self->max_sdu_size_rx, skb);
317 }
318 
319 /*
320  * Function irda_flow_indication (instance, sap, flow)
321  *
322  *    Used by TinyTP to tell us if it can accept more data or not
323  *
324  */
325 static void irda_flow_indication(void *instance, void *sap, LOCAL_FLOW flow)
326 {
327         struct irda_sock *self;
328         struct sock *sk;
329 
330         IRDA_DEBUG(2, "%s()\n", __func__);
331 
332         self = instance;
333         sk = instance;
334         BUG_ON(sk == NULL);
335 
336         switch (flow) {
337         case FLOW_STOP:
338                 IRDA_DEBUG(1, "%s(), IrTTP wants us to slow down\n",
339                            __func__);
340                 self->tx_flow = flow;
341                 break;
342         case FLOW_START:
343                 self->tx_flow = flow;
344                 IRDA_DEBUG(1, "%s(), IrTTP wants us to start again\n",
345                            __func__);
346                 wake_up_interruptible(sk_sleep(sk));
347                 break;
348         default:
349                 IRDA_DEBUG(0, "%s(), Unknown flow command!\n", __func__);
350                 /* Unknown flow command, better stop */
351                 self->tx_flow = flow;
352                 break;
353         }
354 }
355 
356 /*
357  * Function irda_getvalue_confirm (obj_id, value, priv)
358  *
359  *    Got answer from remote LM-IAS, just pass object to requester...
360  *
361  * Note : duplicate from above, but we need our own version that
362  * doesn't touch the dtsap_sel and save the full value structure...
363  */
364 static void irda_getvalue_confirm(int result, __u16 obj_id,
365                                   struct ias_value *value, void *priv)
366 {
367         struct irda_sock *self;
368 
369         self = priv;
370         if (!self) {
371                 IRDA_WARNING("%s: lost myself!\n", __func__);
372                 return;
373         }
374 
375         IRDA_DEBUG(2, "%s(%p)\n", __func__, self);
376 
377         /* We probably don't need to make any more queries */
378         iriap_close(self->iriap);
379         self->iriap = NULL;
380 
381         /* Check if request succeeded */
382         if (result != IAS_SUCCESS) {
383                 IRDA_DEBUG(1, "%s(), IAS query failed! (%d)\n", __func__,
384                            result);
385 
386                 self->errno = result;   /* We really need it later */
387 
388                 /* Wake up any processes waiting for result */
389                 wake_up_interruptible(&self->query_wait);
390 
391                 return;
392         }
393 
394         /* Pass the object to the caller (so the caller must delete it) */
395         self->ias_result = value;
396         self->errno = 0;
397 
398         /* Wake up any processes waiting for result */
399         wake_up_interruptible(&self->query_wait);
400 }
401 
402 /*
403  * Function irda_selective_discovery_indication (discovery)
404  *
405  *    Got a selective discovery indication from IrLMP.
406  *
407  * IrLMP is telling us that this node is new and matching our hint bit
408  * filter. Wake up any process waiting for answer...
409  */
410 static void irda_selective_discovery_indication(discinfo_t *discovery,
411                                                 DISCOVERY_MODE mode,
412                                                 void *priv)
413 {
414         struct irda_sock *self;
415 
416         IRDA_DEBUG(2, "%s()\n", __func__);
417 
418         self = priv;
419         if (!self) {
420                 IRDA_WARNING("%s: lost myself!\n", __func__);
421                 return;
422         }
423 
424         /* Pass parameter to the caller */
425         self->cachedaddr = discovery->daddr;
426 
427         /* Wake up process if its waiting for device to be discovered */
428         wake_up_interruptible(&self->query_wait);
429 }
430 
431 /*
432  * Function irda_discovery_timeout (priv)
433  *
434  *    Timeout in the selective discovery process
435  *
436  * We were waiting for a node to be discovered, but nothing has come up
437  * so far. Wake up the user and tell him that we failed...
438  */
439 static void irda_discovery_timeout(u_long priv)
440 {
441         struct irda_sock *self;
442 
443         IRDA_DEBUG(2, "%s()\n", __func__);
444 
445         self = (struct irda_sock *) priv;
446         BUG_ON(self == NULL);
447 
448         /* Nothing for the caller */
449         self->cachelog = NULL;
450         self->cachedaddr = 0;
451         self->errno = -ETIME;
452 
453         /* Wake up process if its still waiting... */
454         wake_up_interruptible(&self->query_wait);
455 }
456 
457 /*
458  * Function irda_open_tsap (self)
459  *
460  *    Open local Transport Service Access Point (TSAP)
461  *
462  */
463 static int irda_open_tsap(struct irda_sock *self, __u8 tsap_sel, char *name)
464 {
465         notify_t notify;
466 
467         if (self->tsap) {
468                 IRDA_DEBUG(0, "%s: busy!\n", __func__);
469                 return -EBUSY;
470         }
471 
472         /* Initialize callbacks to be used by the IrDA stack */
473         irda_notify_init(&notify);
474         notify.connect_confirm       = irda_connect_confirm;
475         notify.connect_indication    = irda_connect_indication;
476         notify.disconnect_indication = irda_disconnect_indication;
477         notify.data_indication       = irda_data_indication;
478         notify.udata_indication      = irda_data_indication;
479         notify.flow_indication       = irda_flow_indication;
480         notify.instance = self;
481         strncpy(notify.name, name, NOTIFY_MAX_NAME);
482 
483         self->tsap = irttp_open_tsap(tsap_sel, DEFAULT_INITIAL_CREDIT,
484                                      &notify);
485         if (self->tsap == NULL) {
486                 IRDA_DEBUG(0, "%s(), Unable to allocate TSAP!\n",
487                            __func__);
488                 return -ENOMEM;
489         }
490         /* Remember which TSAP selector we actually got */
491         self->stsap_sel = self->tsap->stsap_sel;
492 
493         return 0;
494 }
495 
496 /*
497  * Function irda_open_lsap (self)
498  *
499  *    Open local Link Service Access Point (LSAP). Used for opening Ultra
500  *    sockets
501  */
502 #ifdef CONFIG_IRDA_ULTRA
503 static int irda_open_lsap(struct irda_sock *self, int pid)
504 {
505         notify_t notify;
506 
507         if (self->lsap) {
508                 IRDA_WARNING("%s(), busy!\n", __func__);
509                 return -EBUSY;
510         }
511 
512         /* Initialize callbacks to be used by the IrDA stack */
513         irda_notify_init(&notify);
514         notify.udata_indication = irda_data_indication;
515         notify.instance = self;
516         strncpy(notify.name, "Ultra", NOTIFY_MAX_NAME);
517 
518         self->lsap = irlmp_open_lsap(LSAP_CONNLESS, &notify, pid);
519         if (self->lsap == NULL) {
520                 IRDA_DEBUG( 0, "%s(), Unable to allocate LSAP!\n", __func__);
521                 return -ENOMEM;
522         }
523 
524         return 0;
525 }
526 #endif /* CONFIG_IRDA_ULTRA */
527 
528 /*
529  * Function irda_find_lsap_sel (self, name)
530  *
531  *    Try to lookup LSAP selector in remote LM-IAS
532  *
533  * Basically, we start a IAP query, and then go to sleep. When the query
534  * return, irda_getvalue_confirm will wake us up, and we can examine the
535  * result of the query...
536  * Note that in some case, the query fail even before we go to sleep,
537  * creating some races...
538  */
539 static int irda_find_lsap_sel(struct irda_sock *self, char *name)
540 {
541         IRDA_DEBUG(2, "%s(%p, %s)\n", __func__, self, name);
542 
543         if (self->iriap) {
544                 IRDA_WARNING("%s(): busy with a previous query\n",
545                              __func__);
546                 return -EBUSY;
547         }
548 
549         self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
550                                  irda_getvalue_confirm);
551         if(self->iriap == NULL)
552                 return -ENOMEM;
553 
554         /* Treat unexpected wakeup as disconnect */
555         self->errno = -EHOSTUNREACH;
556 
557         /* Query remote LM-IAS */
558         iriap_getvaluebyclass_request(self->iriap, self->saddr, self->daddr,
559                                       name, "IrDA:TinyTP:LsapSel");
560 
561         /* Wait for answer, if not yet finished (or failed) */
562         if (wait_event_interruptible(self->query_wait, (self->iriap==NULL)))
563                 /* Treat signals as disconnect */
564                 return -EHOSTUNREACH;
565 
566         /* Check what happened */
567         if (self->errno)
568         {
569                 /* Requested object/attribute doesn't exist */
570                 if((self->errno == IAS_CLASS_UNKNOWN) ||
571                    (self->errno == IAS_ATTRIB_UNKNOWN))
572                         return -EADDRNOTAVAIL;
573                 else
574                         return -EHOSTUNREACH;
575         }
576 
577         /* Get the remote TSAP selector */
578         switch (self->ias_result->type) {
579         case IAS_INTEGER:
580                 IRDA_DEBUG(4, "%s() int=%d\n",
581                            __func__, self->ias_result->t.integer);
582 
583                 if (self->ias_result->t.integer != -1)
584                         self->dtsap_sel = self->ias_result->t.integer;
585                 else
586                         self->dtsap_sel = 0;
587                 break;
588         default:
589                 self->dtsap_sel = 0;
590                 IRDA_DEBUG(0, "%s(), bad type!\n", __func__);
591                 break;
592         }
593         if (self->ias_result)
594                 irias_delete_value(self->ias_result);
595 
596         if (self->dtsap_sel)
597                 return 0;
598 
599         return -EADDRNOTAVAIL;
600 }
601 
602 /*
603  * Function irda_discover_daddr_and_lsap_sel (self, name)
604  *
605  *    This try to find a device with the requested service.
606  *
607  * It basically look into the discovery log. For each address in the list,
608  * it queries the LM-IAS of the device to find if this device offer
609  * the requested service.
610  * If there is more than one node supporting the service, we complain
611  * to the user (it should move devices around).
612  * The, we set both the destination address and the lsap selector to point
613  * on the service on the unique device we have found.
614  *
615  * Note : this function fails if there is more than one device in range,
616  * because IrLMP doesn't disconnect the LAP when the last LSAP is closed.
617  * Moreover, we would need to wait the LAP disconnection...
618  */
619 static int irda_discover_daddr_and_lsap_sel(struct irda_sock *self, char *name)
620 {
621         discinfo_t *discoveries;        /* Copy of the discovery log */
622         int     number;                 /* Number of nodes in the log */
623         int     i;
624         int     err = -ENETUNREACH;
625         __u32   daddr = DEV_ADDR_ANY;   /* Address we found the service on */
626         __u8    dtsap_sel = 0x0;        /* TSAP associated with it */
627 
628         IRDA_DEBUG(2, "%s(), name=%s\n", __func__, name);
629 
630         /* Ask lmp for the current discovery log
631          * Note : we have to use irlmp_get_discoveries(), as opposed
632          * to play with the cachelog directly, because while we are
633          * making our ias query, le log might change... */
634         discoveries = irlmp_get_discoveries(&number, self->mask.word,
635                                             self->nslots);
636         /* Check if the we got some results */
637         if (discoveries == NULL)
638                 return -ENETUNREACH;    /* No nodes discovered */
639 
640         /*
641          * Now, check all discovered devices (if any), and connect
642          * client only about the services that the client is
643          * interested in...
644          */
645         for(i = 0; i < number; i++) {
646                 /* Try the address in the log */
647                 self->daddr = discoveries[i].daddr;
648                 self->saddr = 0x0;
649                 IRDA_DEBUG(1, "%s(), trying daddr = %08x\n",
650                            __func__, self->daddr);
651 
652                 /* Query remote LM-IAS for this service */
653                 err = irda_find_lsap_sel(self, name);
654                 switch (err) {
655                 case 0:
656                         /* We found the requested service */
657                         if(daddr != DEV_ADDR_ANY) {
658                                 IRDA_DEBUG(1, "%s(), discovered service ''%s'' in two different devices !!!\n",
659                                            __func__, name);
660                                 self->daddr = DEV_ADDR_ANY;
661                                 kfree(discoveries);
662                                 return -ENOTUNIQ;
663                         }
664                         /* First time we found that one, save it ! */
665                         daddr = self->daddr;
666                         dtsap_sel = self->dtsap_sel;
667                         break;
668                 case -EADDRNOTAVAIL:
669                         /* Requested service simply doesn't exist on this node */
670                         break;
671                 default:
672                         /* Something bad did happen :-( */
673                         IRDA_DEBUG(0, "%s(), unexpected IAS query failure\n", __func__);
674                         self->daddr = DEV_ADDR_ANY;
675                         kfree(discoveries);
676                         return -EHOSTUNREACH;
677                         break;
678                 }
679         }
680         /* Cleanup our copy of the discovery log */
681         kfree(discoveries);
682 
683         /* Check out what we found */
684         if(daddr == DEV_ADDR_ANY) {
685                 IRDA_DEBUG(1, "%s(), cannot discover service ''%s'' in any device !!!\n",
686                            __func__, name);
687                 self->daddr = DEV_ADDR_ANY;
688                 return -EADDRNOTAVAIL;
689         }
690 
691         /* Revert back to discovered device & service */
692         self->daddr = daddr;
693         self->saddr = 0x0;
694         self->dtsap_sel = dtsap_sel;
695 
696         IRDA_DEBUG(1, "%s(), discovered requested service ''%s'' at address %08x\n",
697                    __func__, name, self->daddr);
698 
699         return 0;
700 }
701 
702 /*
703  * Function irda_getname (sock, uaddr, uaddr_len, peer)
704  *
705  *    Return the our own, or peers socket address (sockaddr_irda)
706  *
707  */
708 static int irda_getname(struct socket *sock, struct sockaddr *uaddr,
709                         int *uaddr_len, int peer)
710 {
711         struct sockaddr_irda saddr;
712         struct sock *sk = sock->sk;
713         struct irda_sock *self = irda_sk(sk);
714 
715         memset(&saddr, 0, sizeof(saddr));
716         if (peer) {
717                 if (sk->sk_state != TCP_ESTABLISHED)
718                         return -ENOTCONN;
719 
720                 saddr.sir_family = AF_IRDA;
721                 saddr.sir_lsap_sel = self->dtsap_sel;
722                 saddr.sir_addr = self->daddr;
723         } else {
724                 saddr.sir_family = AF_IRDA;
725                 saddr.sir_lsap_sel = self->stsap_sel;
726                 saddr.sir_addr = self->saddr;
727         }
728 
729         IRDA_DEBUG(1, "%s(), tsap_sel = %#x\n", __func__, saddr.sir_lsap_sel);
730         IRDA_DEBUG(1, "%s(), addr = %08x\n", __func__, saddr.sir_addr);
731 
732         /* uaddr_len come to us uninitialised */
733         *uaddr_len = sizeof (struct sockaddr_irda);
734         memcpy(uaddr, &saddr, *uaddr_len);
735 
736         return 0;
737 }
738 
739 /*
740  * Function irda_listen (sock, backlog)
741  *
742  *    Just move to the listen state
743  *
744  */
745 static int irda_listen(struct socket *sock, int backlog)
746 {
747         struct sock *sk = sock->sk;
748         int err = -EOPNOTSUPP;
749 
750         IRDA_DEBUG(2, "%s()\n", __func__);
751 
752         lock_sock(sk);
753 
754         if ((sk->sk_type != SOCK_STREAM) && (sk->sk_type != SOCK_SEQPACKET) &&
755             (sk->sk_type != SOCK_DGRAM))
756                 goto out;
757 
758         if (sk->sk_state != TCP_LISTEN) {
759                 sk->sk_max_ack_backlog = backlog;
760                 sk->sk_state           = TCP_LISTEN;
761 
762                 err = 0;
763         }
764 out:
765         release_sock(sk);
766 
767         return err;
768 }
769 
770 /*
771  * Function irda_bind (sock, uaddr, addr_len)
772  *
773  *    Used by servers to register their well known TSAP
774  *
775  */
776 static int irda_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
777 {
778         struct sock *sk = sock->sk;
779         struct sockaddr_irda *addr = (struct sockaddr_irda *) uaddr;
780         struct irda_sock *self = irda_sk(sk);
781         int err;
782 
783         IRDA_DEBUG(2, "%s(%p)\n", __func__, self);
784 
785         if (addr_len != sizeof(struct sockaddr_irda))
786                 return -EINVAL;
787 
788         lock_sock(sk);
789 #ifdef CONFIG_IRDA_ULTRA
790         /* Special care for Ultra sockets */
791         if ((sk->sk_type == SOCK_DGRAM) &&
792             (sk->sk_protocol == IRDAPROTO_ULTRA)) {
793                 self->pid = addr->sir_lsap_sel;
794                 err = -EOPNOTSUPP;
795                 if (self->pid & 0x80) {
796                         IRDA_DEBUG(0, "%s(), extension in PID not supp!\n", __func__);
797                         goto out;
798                 }
799                 err = irda_open_lsap(self, self->pid);
800                 if (err < 0)
801                         goto out;
802 
803                 /* Pretend we are connected */
804                 sock->state = SS_CONNECTED;
805                 sk->sk_state   = TCP_ESTABLISHED;
806                 err = 0;
807 
808                 goto out;
809         }
810 #endif /* CONFIG_IRDA_ULTRA */
811 
812         self->ias_obj = irias_new_object(addr->sir_name, jiffies);
813         err = -ENOMEM;
814         if (self->ias_obj == NULL)
815                 goto out;
816 
817         err = irda_open_tsap(self, addr->sir_lsap_sel, addr->sir_name);
818         if (err < 0) {
819                 irias_delete_object(self->ias_obj);
820                 self->ias_obj = NULL;
821                 goto out;
822         }
823 
824         /*  Register with LM-IAS */
825         irias_add_integer_attrib(self->ias_obj, "IrDA:TinyTP:LsapSel",
826                                  self->stsap_sel, IAS_KERNEL_ATTR);
827         irias_insert_object(self->ias_obj);
828 
829         err = 0;
830 out:
831         release_sock(sk);
832         return err;
833 }
834 
835 /*
836  * Function irda_accept (sock, newsock, flags)
837  *
838  *    Wait for incoming connection
839  *
840  */
841 static int irda_accept(struct socket *sock, struct socket *newsock, int flags)
842 {
843         struct sock *sk = sock->sk;
844         struct irda_sock *new, *self = irda_sk(sk);
845         struct sock *newsk;
846         struct sk_buff *skb;
847         int err;
848 
849         IRDA_DEBUG(2, "%s()\n", __func__);
850 
851         err = irda_create(sock_net(sk), newsock, sk->sk_protocol, 0);
852         if (err)
853                 return err;
854 
855         err = -EINVAL;
856 
857         lock_sock(sk);
858         if (sock->state != SS_UNCONNECTED)
859                 goto out;
860 
861         if ((sk = sock->sk) == NULL)
862                 goto out;
863 
864         err = -EOPNOTSUPP;
865         if ((sk->sk_type != SOCK_STREAM) && (sk->sk_type != SOCK_SEQPACKET) &&
866             (sk->sk_type != SOCK_DGRAM))
867                 goto out;
868 
869         err = -EINVAL;
870         if (sk->sk_state != TCP_LISTEN)
871                 goto out;
872 
873         /*
874          *      The read queue this time is holding sockets ready to use
875          *      hooked into the SABM we saved
876          */
877 
878         /*
879          * We can perform the accept only if there is incoming data
880          * on the listening socket.
881          * So, we will block the caller until we receive any data.
882          * If the caller was waiting on select() or poll() before
883          * calling us, the data is waiting for us ;-)
884          * Jean II
885          */
886         while (1) {
887                 skb = skb_dequeue(&sk->sk_receive_queue);
888                 if (skb)
889                         break;
890 
891                 /* Non blocking operation */
892                 err = -EWOULDBLOCK;
893                 if (flags & O_NONBLOCK)
894                         goto out;
895 
896                 err = wait_event_interruptible(*(sk_sleep(sk)),
897                                         skb_peek(&sk->sk_receive_queue));
898                 if (err)
899                         goto out;
900         }
901 
902         newsk = newsock->sk;
903         err = -EIO;
904         if (newsk == NULL)
905                 goto out;
906 
907         newsk->sk_state = TCP_ESTABLISHED;
908 
909         new = irda_sk(newsk);
910 
911         /* Now attach up the new socket */
912         new->tsap = irttp_dup(self->tsap, new);
913         err = -EPERM; /* value does not seem to make sense. -arnd */
914         if (!new->tsap) {
915                 IRDA_DEBUG(0, "%s(), dup failed!\n", __func__);
916                 kfree_skb(skb);
917                 goto out;
918         }
919 
920         new->stsap_sel = new->tsap->stsap_sel;
921         new->dtsap_sel = new->tsap->dtsap_sel;
922         new->saddr = irttp_get_saddr(new->tsap);
923         new->daddr = irttp_get_daddr(new->tsap);
924 
925         new->max_sdu_size_tx = self->max_sdu_size_tx;
926         new->max_sdu_size_rx = self->max_sdu_size_rx;
927         new->max_data_size   = self->max_data_size;
928         new->max_header_size = self->max_header_size;
929 
930         memcpy(&new->qos_tx, &self->qos_tx, sizeof(struct qos_info));
931 
932         /* Clean up the original one to keep it in listen state */
933         irttp_listen(self->tsap);
934 
935         kfree_skb(skb);
936         sk->sk_ack_backlog--;
937 
938         newsock->state = SS_CONNECTED;
939 
940         irda_connect_response(new);
941         err = 0;
942 out:
943         release_sock(sk);
944         return err;
945 }
946 
947 /*
948  * Function irda_connect (sock, uaddr, addr_len, flags)
949  *
950  *    Connect to a IrDA device
951  *
952  * The main difference with a "standard" connect is that with IrDA we need
953  * to resolve the service name into a TSAP selector (in TCP, port number
954  * doesn't have to be resolved).
955  * Because of this service name resolution, we can offer "auto-connect",
956  * where we connect to a service without specifying a destination address.
957  *
958  * Note : by consulting "errno", the user space caller may learn the cause
959  * of the failure. Most of them are visible in the function, others may come
960  * from subroutines called and are listed here :
961  *      o EBUSY : already processing a connect
962  *      o EHOSTUNREACH : bad addr->sir_addr argument
963  *      o EADDRNOTAVAIL : bad addr->sir_name argument
964  *      o ENOTUNIQ : more than one node has addr->sir_name (auto-connect)
965  *      o ENETUNREACH : no node found on the network (auto-connect)
966  */
967 static int irda_connect(struct socket *sock, struct sockaddr *uaddr,
968                         int addr_len, int flags)
969 {
970         struct sock *sk = sock->sk;
971         struct sockaddr_irda *addr = (struct sockaddr_irda *) uaddr;
972         struct irda_sock *self = irda_sk(sk);
973         int err;
974 
975         IRDA_DEBUG(2, "%s(%p)\n", __func__, self);
976 
977         lock_sock(sk);
978         /* Don't allow connect for Ultra sockets */
979         err = -ESOCKTNOSUPPORT;
980         if ((sk->sk_type == SOCK_DGRAM) && (sk->sk_protocol == IRDAPROTO_ULTRA))
981                 goto out;
982 
983         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
984                 sock->state = SS_CONNECTED;
985                 err = 0;
986                 goto out;   /* Connect completed during a ERESTARTSYS event */
987         }
988 
989         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
990                 sock->state = SS_UNCONNECTED;
991                 err = -ECONNREFUSED;
992                 goto out;
993         }
994 
995         err = -EISCONN;      /* No reconnect on a seqpacket socket */
996         if (sk->sk_state == TCP_ESTABLISHED)
997                 goto out;
998 
999         sk->sk_state   = TCP_CLOSE;
1000         sock->state = SS_UNCONNECTED;
1001 
1002         err = -EINVAL;
1003         if (addr_len != sizeof(struct sockaddr_irda))
1004                 goto out;
1005 
1006         /* Check if user supplied any destination device address */
1007         if ((!addr->sir_addr) || (addr->sir_addr == DEV_ADDR_ANY)) {
1008                 /* Try to find one suitable */
1009                 err = irda_discover_daddr_and_lsap_sel(self, addr->sir_name);
1010                 if (err) {
1011                         IRDA_DEBUG(0, "%s(), auto-connect failed!\n", __func__);
1012                         goto out;
1013                 }
1014         } else {
1015                 /* Use the one provided by the user */
1016                 self->daddr = addr->sir_addr;
1017                 IRDA_DEBUG(1, "%s(), daddr = %08x\n", __func__, self->daddr);
1018 
1019                 /* If we don't have a valid service name, we assume the
1020                  * user want to connect on a specific LSAP. Prevent
1021                  * the use of invalid LSAPs (IrLMP 1.1 p10). Jean II */
1022                 if((addr->sir_name[0] != '\0') ||
1023                    (addr->sir_lsap_sel >= 0x70)) {
1024                         /* Query remote LM-IAS using service name */
1025                         err = irda_find_lsap_sel(self, addr->sir_name);
1026                         if (err) {
1027                                 IRDA_DEBUG(0, "%s(), connect failed!\n", __func__);
1028                                 goto out;
1029                         }
1030                 } else {
1031                         /* Directly connect to the remote LSAP
1032                          * specified by the sir_lsap field.
1033                          * Please use with caution, in IrDA LSAPs are
1034                          * dynamic and there is no "well-known" LSAP. */
1035                         self->dtsap_sel = addr->sir_lsap_sel;
1036                 }
1037         }
1038 
1039         /* Check if we have opened a local TSAP */
1040         if (!self->tsap)
1041                 irda_open_tsap(self, LSAP_ANY, addr->sir_name);
1042 
1043         /* Move to connecting socket, start sending Connect Requests */
1044         sock->state = SS_CONNECTING;
1045         sk->sk_state   = TCP_SYN_SENT;
1046 
1047         /* Connect to remote device */
1048         err = irttp_connect_request(self->tsap, self->dtsap_sel,
1049                                     self->saddr, self->daddr, NULL,
1050                                     self->max_sdu_size_rx, NULL);
1051         if (err) {
1052                 IRDA_DEBUG(0, "%s(), connect failed!\n", __func__);
1053                 goto out;
1054         }
1055 
1056         /* Now the loop */
1057         err = -EINPROGRESS;
1058         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
1059                 goto out;
1060 
1061         err = -ERESTARTSYS;
1062         if (wait_event_interruptible(*(sk_sleep(sk)),
1063                                      (sk->sk_state != TCP_SYN_SENT)))
1064                 goto out;
1065 
1066         if (sk->sk_state != TCP_ESTABLISHED) {
1067                 sock->state = SS_UNCONNECTED;
1068                 if (sk->sk_prot->disconnect(sk, flags))
1069                         sock->state = SS_DISCONNECTING;
1070                 err = sock_error(sk);
1071                 if (!err)
1072                         err = -ECONNRESET;
1073                 goto out;
1074         }
1075 
1076         sock->state = SS_CONNECTED;
1077 
1078         /* At this point, IrLMP has assigned our source address */
1079         self->saddr = irttp_get_saddr(self->tsap);
1080         err = 0;
1081 out:
1082         release_sock(sk);
1083         return err;
1084 }
1085 
1086 static struct proto irda_proto = {
1087         .name     = "IRDA",
1088         .owner    = THIS_MODULE,
1089         .obj_size = sizeof(struct irda_sock),
1090 };
1091 
1092 /*
1093  * Function irda_create (sock, protocol)
1094  *
1095  *    Create IrDA socket
1096  *
1097  */
1098 static int irda_create(struct net *net, struct socket *sock, int protocol,
1099                        int kern)
1100 {
1101         struct sock *sk;
1102         struct irda_sock *self;
1103 
1104         IRDA_DEBUG(2, "%s()\n", __func__);
1105 
1106         if (net != &init_net)
1107                 return -EAFNOSUPPORT;
1108 
1109         /* Check for valid socket type */
1110         switch (sock->type) {
1111         case SOCK_STREAM:     /* For TTP connections with SAR disabled */
1112         case SOCK_SEQPACKET:  /* For TTP connections with SAR enabled */
1113         case SOCK_DGRAM:      /* For TTP Unitdata or LMP Ultra transfers */
1114                 break;
1115         default:
1116                 return -ESOCKTNOSUPPORT;
1117         }
1118 
1119         /* Allocate networking socket */
1120         sk = sk_alloc(net, PF_IRDA, GFP_KERNEL, &irda_proto);
1121         if (sk == NULL)
1122                 return -ENOMEM;
1123 
1124         self = irda_sk(sk);
1125         IRDA_DEBUG(2, "%s() : self is %p\n", __func__, self);
1126 
1127         init_waitqueue_head(&self->query_wait);
1128 
1129         switch (sock->type) {
1130         case SOCK_STREAM:
1131                 sock->ops = &irda_stream_ops;
1132                 self->max_sdu_size_rx = TTP_SAR_DISABLE;
1133                 break;
1134         case SOCK_SEQPACKET:
1135                 sock->ops = &irda_seqpacket_ops;
1136                 self->max_sdu_size_rx = TTP_SAR_UNBOUND;
1137                 break;
1138         case SOCK_DGRAM:
1139                 switch (protocol) {
1140 #ifdef CONFIG_IRDA_ULTRA
1141                 case IRDAPROTO_ULTRA:
1142                         sock->ops = &irda_ultra_ops;
1143                         /* Initialise now, because we may send on unbound
1144                          * sockets. Jean II */
1145                         self->max_data_size = ULTRA_MAX_DATA - LMP_PID_HEADER;
1146                         self->max_header_size = IRDA_MAX_HEADER + LMP_PID_HEADER;
1147                         break;
1148 #endif /* CONFIG_IRDA_ULTRA */
1149                 case IRDAPROTO_UNITDATA:
1150                         sock->ops = &irda_dgram_ops;
1151                         /* We let Unitdata conn. be like seqpack conn. */
1152                         self->max_sdu_size_rx = TTP_SAR_UNBOUND;
1153                         break;
1154                 default:
1155                         sk_free(sk);
1156                         return -ESOCKTNOSUPPORT;
1157                 }
1158                 break;
1159         default:
1160                 sk_free(sk);
1161                 return -ESOCKTNOSUPPORT;
1162         }
1163 
1164         /* Initialise networking socket struct */
1165         sock_init_data(sock, sk);       /* Note : set sk->sk_refcnt to 1 */
1166         sk->sk_family = PF_IRDA;
1167         sk->sk_protocol = protocol;
1168 
1169         /* Register as a client with IrLMP */
1170         self->ckey = irlmp_register_client(0, NULL, NULL, NULL);
1171         self->mask.word = 0xffff;
1172         self->rx_flow = self->tx_flow = FLOW_START;
1173         self->nslots = DISCOVERY_DEFAULT_SLOTS;
1174         self->daddr = DEV_ADDR_ANY;     /* Until we get connected */
1175         self->saddr = 0x0;              /* so IrLMP assign us any link */
1176         return 0;
1177 }
1178 
1179 /*
1180  * Function irda_destroy_socket (self)
1181  *
1182  *    Destroy socket
1183  *
1184  */
1185 static void irda_destroy_socket(struct irda_sock *self)
1186 {
1187         IRDA_DEBUG(2, "%s(%p)\n", __func__, self);
1188 
1189         /* Unregister with IrLMP */
1190         irlmp_unregister_client(self->ckey);
1191         irlmp_unregister_service(self->skey);
1192 
1193         /* Unregister with LM-IAS */
1194         if (self->ias_obj) {
1195                 irias_delete_object(self->ias_obj);
1196                 self->ias_obj = NULL;
1197         }
1198 
1199         if (self->iriap) {
1200                 iriap_close(self->iriap);
1201                 self->iriap = NULL;
1202         }
1203 
1204         if (self->tsap) {
1205                 irttp_disconnect_request(self->tsap, NULL, P_NORMAL);
1206                 irttp_close_tsap(self->tsap);
1207                 self->tsap = NULL;
1208         }
1209 #ifdef CONFIG_IRDA_ULTRA
1210         if (self->lsap) {
1211                 irlmp_close_lsap(self->lsap);
1212                 self->lsap = NULL;
1213         }
1214 #endif /* CONFIG_IRDA_ULTRA */
1215 }
1216 
1217 /*
1218  * Function irda_release (sock)
1219  */
1220 static int irda_release(struct socket *sock)
1221 {
1222         struct sock *sk = sock->sk;
1223 
1224         IRDA_DEBUG(2, "%s()\n", __func__);
1225 
1226         if (sk == NULL)
1227                 return 0;
1228 
1229         lock_sock(sk);
1230         sk->sk_state       = TCP_CLOSE;
1231         sk->sk_shutdown   |= SEND_SHUTDOWN;
1232         sk->sk_state_change(sk);
1233 
1234         /* Destroy IrDA socket */
1235         irda_destroy_socket(irda_sk(sk));
1236 
1237         sock_orphan(sk);
1238         sock->sk   = NULL;
1239         release_sock(sk);
1240 
1241         /* Purge queues (see sock_init_data()) */
1242         skb_queue_purge(&sk->sk_receive_queue);
1243 
1244         /* Destroy networking socket if we are the last reference on it,
1245          * i.e. if(sk->sk_refcnt == 0) -> sk_free(sk) */
1246         sock_put(sk);
1247 
1248         /* Notes on socket locking and deallocation... - Jean II
1249          * In theory we should put pairs of sock_hold() / sock_put() to
1250          * prevent the socket to be destroyed whenever there is an
1251          * outstanding request or outstanding incoming packet or event.
1252          *
1253          * 1) This may include IAS request, both in connect and getsockopt.
1254          * Unfortunately, the situation is a bit more messy than it looks,
1255          * because we close iriap and kfree(self) above.
1256          *
1257          * 2) This may include selective discovery in getsockopt.
1258          * Same stuff as above, irlmp registration and self are gone.
1259          *
1260          * Probably 1 and 2 may not matter, because it's all triggered
1261          * by a process and the socket layer already prevent the
1262          * socket to go away while a process is holding it, through
1263          * sockfd_put() and fput()...
1264          *
1265          * 3) This may include deferred TSAP closure. In particular,
1266          * we may receive a late irda_disconnect_indication()
1267          * Fortunately, (tsap_cb *)->close_pend should protect us
1268          * from that.
1269          *
1270          * I did some testing on SMP, and it looks solid. And the socket
1271          * memory leak is now gone... - Jean II
1272          */
1273 
1274         return 0;
1275 }
1276 
1277 /*
1278  * Function irda_sendmsg (iocb, sock, msg, len)
1279  *
1280  *    Send message down to TinyTP. This function is used for both STREAM and
1281  *    SEQPACK services. This is possible since it forces the client to
1282  *    fragment the message if necessary
1283  */
1284 static int irda_sendmsg(struct kiocb *iocb, struct socket *sock,
1285                         struct msghdr *msg, size_t len)
1286 {
1287         struct sock *sk = sock->sk;
1288         struct irda_sock *self;
1289         struct sk_buff *skb;
1290         int err = -EPIPE;
1291 
1292         IRDA_DEBUG(4, "%s(), len=%zd\n", __func__, len);
1293 
1294         /* Note : socket.c set MSG_EOR on SEQPACKET sockets */
1295         if (msg->msg_flags & ~(MSG_DONTWAIT | MSG_EOR | MSG_CMSG_COMPAT |
1296                                MSG_NOSIGNAL)) {
1297                 return -EINVAL;
1298         }
1299 
1300         lock_sock(sk);
1301 
1302         if (sk->sk_shutdown & SEND_SHUTDOWN)
1303                 goto out_err;
1304 
1305         if (sk->sk_state != TCP_ESTABLISHED) {
1306                 err = -ENOTCONN;
1307                 goto out;
1308         }
1309 
1310         self = irda_sk(sk);
1311 
1312         /* Check if IrTTP is wants us to slow down */
1313 
1314         if (wait_event_interruptible(*(sk_sleep(sk)),
1315             (self->tx_flow != FLOW_STOP  ||  sk->sk_state != TCP_ESTABLISHED))) {
1316                 err = -ERESTARTSYS;
1317                 goto out;
1318         }
1319 
1320         /* Check if we are still connected */
1321         if (sk->sk_state != TCP_ESTABLISHED) {
1322                 err = -ENOTCONN;
1323                 goto out;
1324         }
1325 
1326         /* Check that we don't send out too big frames */
1327         if (len > self->max_data_size) {
1328                 IRDA_DEBUG(2, "%s(), Chopping frame from %zd to %d bytes!\n",
1329                            __func__, len, self->max_data_size);
1330                 len = self->max_data_size;
1331         }
1332 
1333         skb = sock_alloc_send_skb(sk, len + self->max_header_size + 16,
1334                                   msg->msg_flags & MSG_DONTWAIT, &err);
1335         if (!skb)
1336                 goto out_err;
1337 
1338         skb_reserve(skb, self->max_header_size + 16);
1339         skb_reset_transport_header(skb);
1340         skb_put(skb, len);
1341         err = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1342         if (err) {
1343                 kfree_skb(skb);
1344                 goto out_err;
1345         }
1346 
1347         /*
1348          * Just send the message to TinyTP, and let it deal with possible
1349          * errors. No need to duplicate all that here
1350          */
1351         err = irttp_data_request(self->tsap, skb);
1352         if (err) {
1353                 IRDA_DEBUG(0, "%s(), err=%d\n", __func__, err);
1354                 goto out_err;
1355         }
1356 
1357         release_sock(sk);
1358         /* Tell client how much data we actually sent */
1359         return len;
1360 
1361 out_err:
1362         err = sk_stream_error(sk, msg->msg_flags, err);
1363 out:
1364         release_sock(sk);
1365         return err;
1366 
1367 }
1368 
1369 /*
1370  * Function irda_recvmsg_dgram (iocb, sock, msg, size, flags)
1371  *
1372  *    Try to receive message and copy it to user. The frame is discarded
1373  *    after being read, regardless of how much the user actually read
1374  */
1375 static int irda_recvmsg_dgram(struct kiocb *iocb, struct socket *sock,
1376                               struct msghdr *msg, size_t size, int flags)
1377 {
1378         struct sock *sk = sock->sk;
1379         struct irda_sock *self = irda_sk(sk);
1380         struct sk_buff *skb;
1381         size_t copied;
1382         int err;
1383 
1384         IRDA_DEBUG(4, "%s()\n", __func__);
1385 
1386         skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1387                                 flags & MSG_DONTWAIT, &err);
1388         if (!skb)
1389                 return err;
1390 
1391         skb_reset_transport_header(skb);
1392         copied = skb->len;
1393 
1394         if (copied > size) {
1395                 IRDA_DEBUG(2, "%s(), Received truncated frame (%zd < %zd)!\n",
1396                            __func__, copied, size);
1397                 copied = size;
1398                 msg->msg_flags |= MSG_TRUNC;
1399         }
1400         skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1401 
1402         skb_free_datagram(sk, skb);
1403 
1404         /*
1405          *  Check if we have previously stopped IrTTP and we know
1406          *  have more free space in our rx_queue. If so tell IrTTP
1407          *  to start delivering frames again before our rx_queue gets
1408          *  empty
1409          */
1410         if (self->rx_flow == FLOW_STOP) {
1411                 if ((atomic_read(&sk->sk_rmem_alloc) << 2) <= sk->sk_rcvbuf) {
1412                         IRDA_DEBUG(2, "%s(), Starting IrTTP\n", __func__);
1413                         self->rx_flow = FLOW_START;
1414                         irttp_flow_request(self->tsap, FLOW_START);
1415                 }
1416         }
1417 
1418         return copied;
1419 }
1420 
1421 /*
1422  * Function irda_recvmsg_stream (iocb, sock, msg, size, flags)
1423  */
1424 static int irda_recvmsg_stream(struct kiocb *iocb, struct socket *sock,
1425                                struct msghdr *msg, size_t size, int flags)
1426 {
1427         struct sock *sk = sock->sk;
1428         struct irda_sock *self = irda_sk(sk);
1429         int noblock = flags & MSG_DONTWAIT;
1430         size_t copied = 0;
1431         int target, err;
1432         long timeo;
1433 
1434         IRDA_DEBUG(3, "%s()\n", __func__);
1435 
1436         if ((err = sock_error(sk)) < 0)
1437                 return err;
1438 
1439         if (sock->flags & __SO_ACCEPTCON)
1440                 return -EINVAL;
1441 
1442         err =-EOPNOTSUPP;
1443         if (flags & MSG_OOB)
1444                 return -EOPNOTSUPP;
1445 
1446         err = 0;
1447         target = sock_rcvlowat(sk, flags & MSG_WAITALL, size);
1448         timeo = sock_rcvtimeo(sk, noblock);
1449 
1450         do {
1451                 int chunk;
1452                 struct sk_buff *skb = skb_dequeue(&sk->sk_receive_queue);
1453 
1454                 if (skb == NULL) {
1455                         DEFINE_WAIT(wait);
1456                         err = 0;
1457 
1458                         if (copied >= target)
1459                                 break;
1460 
1461                         prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1462 
1463                         /*
1464                          *      POSIX 1003.1g mandates this order.
1465                          */
1466                         err = sock_error(sk);
1467                         if (err)
1468                                 ;
1469                         else if (sk->sk_shutdown & RCV_SHUTDOWN)
1470                                 ;
1471                         else if (noblock)
1472                                 err = -EAGAIN;
1473                         else if (signal_pending(current))
1474                                 err = sock_intr_errno(timeo);
1475                         else if (sk->sk_state != TCP_ESTABLISHED)
1476                                 err = -ENOTCONN;
1477                         else if (skb_peek(&sk->sk_receive_queue) == NULL)
1478                                 /* Wait process until data arrives */
1479                                 schedule();
1480 
1481                         finish_wait(sk_sleep(sk), &wait);
1482 
1483                         if (err)
1484                                 return err;
1485                         if (sk->sk_shutdown & RCV_SHUTDOWN)
1486                                 break;
1487 
1488                         continue;
1489                 }
1490 
1491                 chunk = min_t(unsigned int, skb->len, size);
1492                 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
1493                         skb_queue_head(&sk->sk_receive_queue, skb);
1494                         if (copied == 0)
1495                                 copied = -EFAULT;
1496                         break;
1497                 }
1498                 copied += chunk;
1499                 size -= chunk;
1500 
1501                 /* Mark read part of skb as used */
1502                 if (!(flags & MSG_PEEK)) {
1503                         skb_pull(skb, chunk);
1504 
1505                         /* put the skb back if we didn't use it up.. */
1506                         if (skb->len) {
1507                                 IRDA_DEBUG(1, "%s(), back on q!\n",
1508                                            __func__);
1509                                 skb_queue_head(&sk->sk_receive_queue, skb);
1510                                 break;
1511                         }
1512 
1513                         kfree_skb(skb);
1514                 } else {
1515                         IRDA_DEBUG(0, "%s() questionable!?\n", __func__);
1516 
1517                         /* put message back and return */
1518                         skb_queue_head(&sk->sk_receive_queue, skb);
1519                         break;
1520                 }
1521         } while (size);
1522 
1523         /*
1524          *  Check if we have previously stopped IrTTP and we know
1525          *  have more free space in our rx_queue. If so tell IrTTP
1526          *  to start delivering frames again before our rx_queue gets
1527          *  empty
1528          */
1529         if (self->rx_flow == FLOW_STOP) {
1530                 if ((atomic_read(&sk->sk_rmem_alloc) << 2) <= sk->sk_rcvbuf) {
1531                         IRDA_DEBUG(2, "%s(), Starting IrTTP\n", __func__);
1532                         self->rx_flow = FLOW_START;
1533                         irttp_flow_request(self->tsap, FLOW_START);
1534                 }
1535         }
1536 
1537         return copied;
1538 }
1539 
1540 /*
1541  * Function irda_sendmsg_dgram (iocb, sock, msg, len)
1542  *
1543  *    Send message down to TinyTP for the unreliable sequenced
1544  *    packet service...
1545  *
1546  */
1547 static int irda_sendmsg_dgram(struct kiocb *iocb, struct socket *sock,
1548                               struct msghdr *msg, size_t len)
1549 {
1550         struct sock *sk = sock->sk;
1551         struct irda_sock *self;
1552         struct sk_buff *skb;
1553         int err;
1554 
1555         IRDA_DEBUG(4, "%s(), len=%zd\n", __func__, len);
1556 
1557         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
1558                 return -EINVAL;
1559 
1560         lock_sock(sk);
1561 
1562         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1563                 send_sig(SIGPIPE, current, 0);
1564                 err = -EPIPE;
1565                 goto out;
1566         }
1567 
1568         err = -ENOTCONN;
1569         if (sk->sk_state != TCP_ESTABLISHED)
1570                 goto out;
1571 
1572         self = irda_sk(sk);
1573 
1574         /*
1575          * Check that we don't send out too big frames. This is an unreliable
1576          * service, so we have no fragmentation and no coalescence
1577          */
1578         if (len > self->max_data_size) {
1579                 IRDA_DEBUG(0, "%s(), Warning to much data! "
1580                            "Chopping frame from %zd to %d bytes!\n",
1581                            __func__, len, self->max_data_size);
1582                 len = self->max_data_size;
1583         }
1584 
1585         skb = sock_alloc_send_skb(sk, len + self->max_header_size,
1586                                   msg->msg_flags & MSG_DONTWAIT, &err);
1587         err = -ENOBUFS;
1588         if (!skb)
1589                 goto out;
1590 
1591         skb_reserve(skb, self->max_header_size);
1592         skb_reset_transport_header(skb);
1593 
1594         IRDA_DEBUG(4, "%s(), appending user data\n", __func__);
1595         skb_put(skb, len);
1596         err = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1597         if (err) {
1598                 kfree_skb(skb);
1599                 goto out;
1600         }
1601 
1602         /*
1603          * Just send the message to TinyTP, and let it deal with possible
1604          * errors. No need to duplicate all that here
1605          */
1606         err = irttp_udata_request(self->tsap, skb);
1607         if (err) {
1608                 IRDA_DEBUG(0, "%s(), err=%d\n", __func__, err);
1609                 goto out;
1610         }
1611 
1612         release_sock(sk);
1613         return len;
1614 
1615 out:
1616         release_sock(sk);
1617         return err;
1618 }
1619 
1620 /*
1621  * Function irda_sendmsg_ultra (iocb, sock, msg, len)
1622  *
1623  *    Send message down to IrLMP for the unreliable Ultra
1624  *    packet service...
1625  */
1626 #ifdef CONFIG_IRDA_ULTRA
1627 static int irda_sendmsg_ultra(struct kiocb *iocb, struct socket *sock,
1628                               struct msghdr *msg, size_t len)
1629 {
1630         struct sock *sk = sock->sk;
1631         struct irda_sock *self;
1632         __u8 pid = 0;
1633         int bound = 0;
1634         struct sk_buff *skb;
1635         int err;
1636 
1637         IRDA_DEBUG(4, "%s(), len=%zd\n", __func__, len);
1638 
1639         err = -EINVAL;
1640         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
1641                 return -EINVAL;
1642 
1643         lock_sock(sk);
1644 
1645         err = -EPIPE;
1646         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1647                 send_sig(SIGPIPE, current, 0);
1648                 goto out;
1649         }
1650 
1651         self = irda_sk(sk);
1652 
1653         /* Check if an address was specified with sendto. Jean II */
1654         if (msg->msg_name) {
1655                 DECLARE_SOCKADDR(struct sockaddr_irda *, addr, msg->msg_name);
1656                 err = -EINVAL;
1657                 /* Check address, extract pid. Jean II */
1658                 if (msg->msg_namelen < sizeof(*addr))
1659                         goto out;
1660                 if (addr->sir_family != AF_IRDA)
1661                         goto out;
1662 
1663                 pid = addr->sir_lsap_sel;
1664                 if (pid & 0x80) {
1665                         IRDA_DEBUG(0, "%s(), extension in PID not supp!\n", __func__);
1666                         err = -EOPNOTSUPP;
1667                         goto out;
1668                 }
1669         } else {
1670                 /* Check that the socket is properly bound to an Ultra
1671                  * port. Jean II */
1672                 if ((self->lsap == NULL) ||
1673                     (sk->sk_state != TCP_ESTABLISHED)) {
1674                         IRDA_DEBUG(0, "%s(), socket not bound to Ultra PID.\n",
1675                                    __func__);
1676                         err = -ENOTCONN;
1677                         goto out;
1678                 }
1679                 /* Use PID from socket */
1680                 bound = 1;
1681         }
1682 
1683         /*
1684          * Check that we don't send out too big frames. This is an unreliable
1685          * service, so we have no fragmentation and no coalescence
1686          */
1687         if (len > self->max_data_size) {
1688                 IRDA_DEBUG(0, "%s(), Warning to much data! "
1689                            "Chopping frame from %zd to %d bytes!\n",
1690                            __func__, len, self->max_data_size);
1691                 len = self->max_data_size;
1692         }
1693 
1694         skb = sock_alloc_send_skb(sk, len + self->max_header_size,
1695                                   msg->msg_flags & MSG_DONTWAIT, &err);
1696         err = -ENOBUFS;
1697         if (!skb)
1698                 goto out;
1699 
1700         skb_reserve(skb, self->max_header_size);
1701         skb_reset_transport_header(skb);
1702 
1703         IRDA_DEBUG(4, "%s(), appending user data\n", __func__);
1704         skb_put(skb, len);
1705         err = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1706         if (err) {
1707                 kfree_skb(skb);
1708                 goto out;
1709         }
1710 
1711         err = irlmp_connless_data_request((bound ? self->lsap : NULL),
1712                                           skb, pid);
1713         if (err)
1714                 IRDA_DEBUG(0, "%s(), err=%d\n", __func__, err);
1715 out:
1716         release_sock(sk);
1717         return err ? : len;
1718 }
1719 #endif /* CONFIG_IRDA_ULTRA */
1720 
1721 /*
1722  * Function irda_shutdown (sk, how)
1723  */
1724 static int irda_shutdown(struct socket *sock, int how)
1725 {
1726         struct sock *sk = sock->sk;
1727         struct irda_sock *self = irda_sk(sk);
1728 
1729         IRDA_DEBUG(1, "%s(%p)\n", __func__, self);
1730 
1731         lock_sock(sk);
1732 
1733         sk->sk_state       = TCP_CLOSE;
1734         sk->sk_shutdown   |= SEND_SHUTDOWN;
1735         sk->sk_state_change(sk);
1736 
1737         if (self->iriap) {
1738                 iriap_close(self->iriap);
1739                 self->iriap = NULL;
1740         }
1741 
1742         if (self->tsap) {
1743                 irttp_disconnect_request(self->tsap, NULL, P_NORMAL);
1744                 irttp_close_tsap(self->tsap);
1745                 self->tsap = NULL;
1746         }
1747 
1748         /* A few cleanup so the socket look as good as new... */
1749         self->rx_flow = self->tx_flow = FLOW_START;     /* needed ??? */
1750         self->daddr = DEV_ADDR_ANY;     /* Until we get re-connected */
1751         self->saddr = 0x0;              /* so IrLMP assign us any link */
1752 
1753         release_sock(sk);
1754 
1755         return 0;
1756 }
1757 
1758 /*
1759  * Function irda_poll (file, sock, wait)
1760  */
1761 static unsigned int irda_poll(struct file * file, struct socket *sock,
1762                               poll_table *wait)
1763 {
1764         struct sock *sk = sock->sk;
1765         struct irda_sock *self = irda_sk(sk);
1766         unsigned int mask;
1767 
1768         IRDA_DEBUG(4, "%s()\n", __func__);
1769 
1770         poll_wait(file, sk_sleep(sk), wait);
1771         mask = 0;
1772 
1773         /* Exceptional events? */
1774         if (sk->sk_err)
1775                 mask |= POLLERR;
1776         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1777                 IRDA_DEBUG(0, "%s(), POLLHUP\n", __func__);
1778                 mask |= POLLHUP;
1779         }
1780 
1781         /* Readable? */
1782         if (!skb_queue_empty(&sk->sk_receive_queue)) {
1783                 IRDA_DEBUG(4, "Socket is readable\n");
1784                 mask |= POLLIN | POLLRDNORM;
1785         }
1786 
1787         /* Connection-based need to check for termination and startup */
1788         switch (sk->sk_type) {
1789         case SOCK_STREAM:
1790                 if (sk->sk_state == TCP_CLOSE) {
1791                         IRDA_DEBUG(0, "%s(), POLLHUP\n", __func__);
1792                         mask |= POLLHUP;
1793                 }
1794 
1795                 if (sk->sk_state == TCP_ESTABLISHED) {
1796                         if ((self->tx_flow == FLOW_START) &&
1797                             sock_writeable(sk))
1798                         {
1799                                 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1800                         }
1801                 }
1802                 break;
1803         case SOCK_SEQPACKET:
1804                 if ((self->tx_flow == FLOW_START) &&
1805                     sock_writeable(sk))
1806                 {
1807                         mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1808                 }
1809                 break;
1810         case SOCK_DGRAM:
1811                 if (sock_writeable(sk))
1812                         mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1813                 break;
1814         default:
1815                 break;
1816         }
1817 
1818         return mask;
1819 }
1820 
1821 /*
1822  * Function irda_ioctl (sock, cmd, arg)
1823  */
1824 static int irda_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1825 {
1826         struct sock *sk = sock->sk;
1827         int err;
1828 
1829         IRDA_DEBUG(4, "%s(), cmd=%#x\n", __func__, cmd);
1830 
1831         err = -EINVAL;
1832         switch (cmd) {
1833         case TIOCOUTQ: {
1834                 long amount;
1835 
1836                 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1837                 if (amount < 0)
1838                         amount = 0;
1839                 err = put_user(amount, (unsigned int __user *)arg);
1840                 break;
1841         }
1842 
1843         case TIOCINQ: {
1844                 struct sk_buff *skb;
1845                 long amount = 0L;
1846                 /* These two are safe on a single CPU system as only user tasks fiddle here */
1847                 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1848                         amount = skb->len;
1849                 err = put_user(amount, (unsigned int __user *)arg);
1850                 break;
1851         }
1852 
1853         case SIOCGSTAMP:
1854                 if (sk != NULL)
1855                         err = sock_get_timestamp(sk, (struct timeval __user *)arg);
1856                 break;
1857 
1858         case SIOCGIFADDR:
1859         case SIOCSIFADDR:
1860         case SIOCGIFDSTADDR:
1861         case SIOCSIFDSTADDR:
1862         case SIOCGIFBRDADDR:
1863         case SIOCSIFBRDADDR:
1864         case SIOCGIFNETMASK:
1865         case SIOCSIFNETMASK:
1866         case SIOCGIFMETRIC:
1867         case SIOCSIFMETRIC:
1868                 break;
1869         default:
1870                 IRDA_DEBUG(1, "%s(), doing device ioctl!\n", __func__);
1871                 err = -ENOIOCTLCMD;
1872         }
1873 
1874         return err;
1875 }
1876 
1877 #ifdef CONFIG_COMPAT
1878 /*
1879  * Function irda_ioctl (sock, cmd, arg)
1880  */
1881 static int irda_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1882 {
1883         /*
1884          * All IRDA's ioctl are standard ones.
1885          */
1886         return -ENOIOCTLCMD;
1887 }
1888 #endif
1889 
1890 /*
1891  * Function irda_setsockopt (sock, level, optname, optval, optlen)
1892  *
1893  *    Set some options for the socket
1894  *
1895  */
1896 static int irda_setsockopt(struct socket *sock, int level, int optname,
1897                            char __user *optval, unsigned int optlen)
1898 {
1899         struct sock *sk = sock->sk;
1900         struct irda_sock *self = irda_sk(sk);
1901         struct irda_ias_set    *ias_opt;
1902         struct ias_object      *ias_obj;
1903         struct ias_attrib *     ias_attr;       /* Attribute in IAS object */
1904         int opt, free_ias = 0, err = 0;
1905 
1906         IRDA_DEBUG(2, "%s(%p)\n", __func__, self);
1907 
1908         if (level != SOL_IRLMP)
1909                 return -ENOPROTOOPT;
1910 
1911         lock_sock(sk);
1912 
1913         switch (optname) {
1914         case IRLMP_IAS_SET:
1915                 /* The user want to add an attribute to an existing IAS object
1916                  * (in the IAS database) or to create a new object with this
1917                  * attribute.
1918                  * We first query IAS to know if the object exist, and then
1919                  * create the right attribute...
1920                  */
1921 
1922                 if (optlen != sizeof(struct irda_ias_set)) {
1923                         err = -EINVAL;
1924                         goto out;
1925                 }
1926 
1927                 ias_opt = kmalloc(sizeof(struct irda_ias_set), GFP_ATOMIC);
1928                 if (ias_opt == NULL) {
1929                         err = -ENOMEM;
1930                         goto out;
1931                 }
1932 
1933                 /* Copy query to the driver. */
1934                 if (copy_from_user(ias_opt, optval, optlen)) {
1935                         kfree(ias_opt);
1936                         err = -EFAULT;
1937                         goto out;
1938                 }
1939 
1940                 /* Find the object we target.
1941                  * If the user gives us an empty string, we use the object
1942                  * associated with this socket. This will workaround
1943                  * duplicated class name - Jean II */
1944                 if(ias_opt->irda_class_name[0] == '\0') {
1945                         if(self->ias_obj == NULL) {
1946                                 kfree(ias_opt);
1947                                 err = -EINVAL;
1948                                 goto out;
1949                         }
1950                         ias_obj = self->ias_obj;
1951                 } else
1952                         ias_obj = irias_find_object(ias_opt->irda_class_name);
1953 
1954                 /* Only ROOT can mess with the global IAS database.
1955                  * Users can only add attributes to the object associated
1956                  * with the socket they own - Jean II */
1957                 if((!capable(CAP_NET_ADMIN)) &&
1958                    ((ias_obj == NULL) || (ias_obj != self->ias_obj))) {
1959                         kfree(ias_opt);
1960                         err = -EPERM;
1961                         goto out;
1962                 }
1963 
1964                 /* If the object doesn't exist, create it */
1965                 if(ias_obj == (struct ias_object *) NULL) {
1966                         /* Create a new object */
1967                         ias_obj = irias_new_object(ias_opt->irda_class_name,
1968                                                    jiffies);
1969                         if (ias_obj == NULL) {
1970                                 kfree(ias_opt);
1971                                 err = -ENOMEM;
1972                                 goto out;
1973                         }
1974                         free_ias = 1;
1975                 }
1976 
1977                 /* Do we have the attribute already ? */
1978                 if(irias_find_attrib(ias_obj, ias_opt->irda_attrib_name)) {
1979                         kfree(ias_opt);
1980                         if (free_ias) {
1981                                 kfree(ias_obj->name);
1982                                 kfree(ias_obj);
1983                         }
1984                         err = -EINVAL;
1985                         goto out;
1986                 }
1987 
1988                 /* Look at the type */
1989                 switch(ias_opt->irda_attrib_type) {
1990                 case IAS_INTEGER:
1991                         /* Add an integer attribute */
1992                         irias_add_integer_attrib(
1993                                 ias_obj,
1994                                 ias_opt->irda_attrib_name,
1995                                 ias_opt->attribute.irda_attrib_int,
1996                                 IAS_USER_ATTR);
1997                         break;
1998                 case IAS_OCT_SEQ:
1999                         /* Check length */
2000                         if(ias_opt->attribute.irda_attrib_octet_seq.len >
2001                            IAS_MAX_OCTET_STRING) {
2002                                 kfree(ias_opt);
2003                                 if (free_ias) {
2004                                         kfree(ias_obj->name);
2005                                         kfree(ias_obj);
2006                                 }
2007 
2008                                 err = -EINVAL;
2009                                 goto out;
2010                         }
2011                         /* Add an octet sequence attribute */
2012                         irias_add_octseq_attrib(
2013                               ias_obj,
2014                               ias_opt->irda_attrib_name,
2015                               ias_opt->attribute.irda_attrib_octet_seq.octet_seq,
2016                               ias_opt->attribute.irda_attrib_octet_seq.len,
2017                               IAS_USER_ATTR);
2018                         break;
2019                 case IAS_STRING:
2020                         /* Should check charset & co */
2021                         /* Check length */
2022                         /* The length is encoded in a __u8, and
2023                          * IAS_MAX_STRING == 256, so there is no way
2024                          * userspace can pass us a string too large.
2025                          * Jean II */
2026                         /* NULL terminate the string (avoid troubles) */
2027                         ias_opt->attribute.irda_attrib_string.string[ias_opt->attribute.irda_attrib_string.len] = '\0';
2028                         /* Add a string attribute */
2029                         irias_add_string_attrib(
2030                                 ias_obj,
2031                                 ias_opt->irda_attrib_name,
2032                                 ias_opt->attribute.irda_attrib_string.string,
2033                                 IAS_USER_ATTR);
2034                         break;
2035                 default :
2036                         kfree(ias_opt);
2037                         if (free_ias) {
2038                                 kfree(ias_obj->name);
2039                                 kfree(ias_obj);
2040                         }
2041                         err = -EINVAL;
2042                         goto out;
2043                 }
2044                 irias_insert_object(ias_obj);
2045                 kfree(ias_opt);
2046                 break;
2047         case IRLMP_IAS_DEL:
2048                 /* The user want to delete an object from our local IAS
2049                  * database. We just need to query the IAS, check is the
2050                  * object is not owned by the kernel and delete it.
2051                  */
2052 
2053                 if (optlen != sizeof(struct irda_ias_set)) {
2054                         err = -EINVAL;
2055                         goto out;
2056                 }
2057 
2058                 ias_opt = kmalloc(sizeof(struct irda_ias_set), GFP_ATOMIC);
2059                 if (ias_opt == NULL) {
2060                         err = -ENOMEM;
2061                         goto out;
2062                 }
2063 
2064                 /* Copy query to the driver. */
2065                 if (copy_from_user(ias_opt, optval, optlen)) {
2066                         kfree(ias_opt);
2067                         err = -EFAULT;
2068                         goto out;
2069                 }
2070 
2071                 /* Find the object we target.
2072                  * If the user gives us an empty string, we use the object
2073                  * associated with this socket. This will workaround
2074                  * duplicated class name - Jean II */
2075                 if(ias_opt->irda_class_name[0] == '\0')
2076                         ias_obj = self->ias_obj;
2077                 else
2078                         ias_obj = irias_find_object(ias_opt->irda_class_name);
2079                 if(ias_obj == (struct ias_object *) NULL) {
2080                         kfree(ias_opt);
2081                         err = -EINVAL;
2082                         goto out;
2083                 }
2084 
2085                 /* Only ROOT can mess with the global IAS database.
2086                  * Users can only del attributes from the object associated
2087                  * with the socket they own - Jean II */
2088                 if((!capable(CAP_NET_ADMIN)) &&
2089                    ((ias_obj == NULL) || (ias_obj != self->ias_obj))) {
2090                         kfree(ias_opt);
2091                         err = -EPERM;
2092                         goto out;
2093                 }
2094 
2095                 /* Find the attribute (in the object) we target */
2096                 ias_attr = irias_find_attrib(ias_obj,
2097                                              ias_opt->irda_attrib_name);
2098                 if(ias_attr == (struct ias_attrib *) NULL) {
2099                         kfree(ias_opt);
2100                         err = -EINVAL;
2101                         goto out;
2102                 }
2103 
2104                 /* Check is the user space own the object */
2105                 if(ias_attr->value->owner != IAS_USER_ATTR) {
2106                         IRDA_DEBUG(1, "%s(), attempting to delete a kernel attribute\n", __func__);
2107                         kfree(ias_opt);
2108                         err = -EPERM;
2109                         goto out;
2110                 }
2111 
2112                 /* Remove the attribute (and maybe the object) */
2113                 irias_delete_attrib(ias_obj, ias_attr, 1);
2114                 kfree(ias_opt);
2115                 break;
2116         case IRLMP_MAX_SDU_SIZE:
2117                 if (optlen < sizeof(int)) {
2118                         err = -EINVAL;
2119                         goto out;
2120                 }
2121 
2122                 if (get_user(opt, (int __user *)optval)) {
2123                         err = -EFAULT;
2124                         goto out;
2125                 }
2126 
2127                 /* Only possible for a seqpacket service (TTP with SAR) */
2128                 if (sk->sk_type != SOCK_SEQPACKET) {
2129                         IRDA_DEBUG(2, "%s(), setting max_sdu_size = %d\n",
2130                                    __func__, opt);
2131                         self->max_sdu_size_rx = opt;
2132                 } else {
2133                         IRDA_WARNING("%s: not allowed to set MAXSDUSIZE for this socket type!\n",
2134                                      __func__);
2135                         err = -ENOPROTOOPT;
2136                         goto out;
2137                 }
2138                 break;
2139         case IRLMP_HINTS_SET:
2140                 if (optlen < sizeof(int)) {
2141                         err = -EINVAL;
2142                         goto out;
2143                 }
2144 
2145                 /* The input is really a (__u8 hints[2]), easier as an int */
2146                 if (get_user(opt, (int __user *)optval)) {
2147                         err = -EFAULT;
2148                         goto out;
2149                 }
2150 
2151                 /* Unregister any old registration */
2152                 if (self->skey)
2153                         irlmp_unregister_service(self->skey);
2154 
2155                 self->skey = irlmp_register_service((__u16) opt);
2156                 break;
2157         case IRLMP_HINT_MASK_SET:
2158                 /* As opposed to the previous case which set the hint bits
2159                  * that we advertise, this one set the filter we use when
2160                  * making a discovery (nodes which don't match any hint
2161                  * bit in the mask are not reported).
2162                  */
2163                 if (optlen < sizeof(int)) {
2164                         err = -EINVAL;
2165                         goto out;
2166                 }
2167 
2168                 /* The input is really a (__u8 hints[2]), easier as an int */
2169                 if (get_user(opt, (int __user *)optval)) {
2170                         err = -EFAULT;
2171                         goto out;
2172                 }
2173 
2174                 /* Set the new hint mask */
2175                 self->mask.word = (__u16) opt;
2176                 /* Mask out extension bits */
2177                 self->mask.word &= 0x7f7f;
2178                 /* Check if no bits */
2179                 if(!self->mask.word)
2180                         self->mask.word = 0xFFFF;
2181 
2182                 break;
2183         default:
2184                 err = -ENOPROTOOPT;
2185                 break;
2186         }
2187 
2188 out:
2189         release_sock(sk);
2190 
2191         return err;
2192 }
2193 
2194 /*
2195  * Function irda_extract_ias_value(ias_opt, ias_value)
2196  *
2197  *    Translate internal IAS value structure to the user space representation
2198  *
2199  * The external representation of IAS values, as we exchange them with
2200  * user space program is quite different from the internal representation,
2201  * as stored in the IAS database (because we need a flat structure for
2202  * crossing kernel boundary).
2203  * This function transform the former in the latter. We also check
2204  * that the value type is valid.
2205  */
2206 static int irda_extract_ias_value(struct irda_ias_set *ias_opt,
2207                                   struct ias_value *ias_value)
2208 {
2209         /* Look at the type */
2210         switch (ias_value->type) {
2211         case IAS_INTEGER:
2212                 /* Copy the integer */
2213                 ias_opt->attribute.irda_attrib_int = ias_value->t.integer;
2214                 break;
2215         case IAS_OCT_SEQ:
2216                 /* Set length */
2217                 ias_opt->attribute.irda_attrib_octet_seq.len = ias_value->len;
2218                 /* Copy over */
2219                 memcpy(ias_opt->attribute.irda_attrib_octet_seq.octet_seq,
2220                        ias_value->t.oct_seq, ias_value->len);
2221                 break;
2222         case IAS_STRING:
2223                 /* Set length */
2224                 ias_opt->attribute.irda_attrib_string.len = ias_value->len;
2225                 ias_opt->attribute.irda_attrib_string.charset = ias_value->charset;
2226                 /* Copy over */
2227                 memcpy(ias_opt->attribute.irda_attrib_string.string,
2228                        ias_value->t.string, ias_value->len);
2229                 /* NULL terminate the string (avoid troubles) */
2230                 ias_opt->attribute.irda_attrib_string.string[ias_value->len] = '\0';
2231                 break;
2232         case IAS_MISSING:
2233         default :
2234                 return -EINVAL;
2235         }
2236 
2237         /* Copy type over */
2238         ias_opt->irda_attrib_type = ias_value->type;
2239 
2240         return 0;
2241 }
2242 
2243 /*
2244  * Function irda_getsockopt (sock, level, optname, optval, optlen)
2245  */
2246 static int irda_getsockopt(struct socket *sock, int level, int optname,
2247                            char __user *optval, int __user *optlen)
2248 {
2249         struct sock *sk = sock->sk;
2250         struct irda_sock *self = irda_sk(sk);
2251         struct irda_device_list list;
2252         struct irda_device_info *discoveries;
2253         struct irda_ias_set *   ias_opt;        /* IAS get/query params */
2254         struct ias_object *     ias_obj;        /* Object in IAS */
2255         struct ias_attrib *     ias_attr;       /* Attribute in IAS object */
2256         int daddr = DEV_ADDR_ANY;       /* Dest address for IAS queries */
2257         int val = 0;
2258         int len = 0;
2259         int err = 0;
2260         int offset, total;
2261 
2262         IRDA_DEBUG(2, "%s(%p)\n", __func__, self);
2263 
2264         if (level != SOL_IRLMP)
2265                 return -ENOPROTOOPT;
2266 
2267         if (get_user(len, optlen))
2268                 return -EFAULT;
2269 
2270         if(len < 0)
2271                 return -EINVAL;
2272 
2273         lock_sock(sk);
2274 
2275         switch (optname) {
2276         case IRLMP_ENUMDEVICES:
2277 
2278                 /* Offset to first device entry */
2279                 offset = sizeof(struct irda_device_list) -
2280                         sizeof(struct irda_device_info);
2281 
2282                 if (len < offset) {
2283                         err = -EINVAL;
2284                         goto out;
2285                 }
2286 
2287                 /* Ask lmp for the current discovery log */
2288                 discoveries = irlmp_get_discoveries(&list.len, self->mask.word,
2289                                                     self->nslots);
2290                 /* Check if the we got some results */
2291                 if (discoveries == NULL) {
2292                         err = -EAGAIN;
2293                         goto out;               /* Didn't find any devices */
2294                 }
2295 
2296                 /* Write total list length back to client */
2297                 if (copy_to_user(optval, &list, offset))
2298                         err = -EFAULT;
2299 
2300                 /* Copy the list itself - watch for overflow */
2301                 if (list.len > 2048) {
2302                         err = -EINVAL;
2303                         goto bed;
2304                 }
2305                 total = offset + (list.len * sizeof(struct irda_device_info));
2306                 if (total > len)
2307                         total = len;
2308                 if (copy_to_user(optval+offset, discoveries, total - offset))
2309                         err = -EFAULT;
2310 
2311                 /* Write total number of bytes used back to client */
2312                 if (put_user(total, optlen))
2313                         err = -EFAULT;
2314 bed:
2315                 /* Free up our buffer */
2316                 kfree(discoveries);
2317                 break;
2318         case IRLMP_MAX_SDU_SIZE:
2319                 val = self->max_data_size;
2320                 len = sizeof(int);
2321                 if (put_user(len, optlen)) {
2322                         err = -EFAULT;
2323                         goto out;
2324                 }
2325 
2326                 if (copy_to_user(optval, &val, len)) {
2327                         err = -EFAULT;
2328                         goto out;
2329                 }
2330 
2331                 break;
2332         case IRLMP_IAS_GET:
2333                 /* The user want an object from our local IAS database.
2334                  * We just need to query the IAS and return the value
2335                  * that we found */
2336 
2337                 /* Check that the user has allocated the right space for us */
2338                 if (len != sizeof(struct irda_ias_set)) {
2339                         err = -EINVAL;
2340                         goto out;
2341                 }
2342 
2343                 ias_opt = kmalloc(sizeof(struct irda_ias_set), GFP_ATOMIC);
2344                 if (ias_opt == NULL) {
2345                         err = -ENOMEM;
2346                         goto out;
2347                 }
2348 
2349                 /* Copy query to the driver. */
2350                 if (copy_from_user(ias_opt, optval, len)) {
2351                         kfree(ias_opt);
2352                         err = -EFAULT;
2353                         goto out;
2354                 }
2355 
2356                 /* Find the object we target.
2357                  * If the user gives us an empty string, we use the object
2358                  * associated with this socket. This will workaround
2359                  * duplicated class name - Jean II */
2360                 if(ias_opt->irda_class_name[0] == '\0')
2361                         ias_obj = self->ias_obj;
2362                 else
2363                         ias_obj = irias_find_object(ias_opt->irda_class_name);
2364                 if(ias_obj == (struct ias_object *) NULL) {
2365                         kfree(ias_opt);
2366                         err = -EINVAL;
2367                         goto out;
2368                 }
2369 
2370                 /* Find the attribute (in the object) we target */
2371                 ias_attr = irias_find_attrib(ias_obj,
2372                                              ias_opt->irda_attrib_name);
2373                 if(ias_attr == (struct ias_attrib *) NULL) {
2374                         kfree(ias_opt);
2375                         err = -EINVAL;
2376                         goto out;
2377                 }
2378 
2379                 /* Translate from internal to user structure */
2380                 err = irda_extract_ias_value(ias_opt, ias_attr->value);
2381                 if(err) {
2382                         kfree(ias_opt);
2383                         goto out;
2384                 }
2385 
2386                 /* Copy reply to the user */
2387                 if (copy_to_user(optval, ias_opt,
2388                                  sizeof(struct irda_ias_set))) {
2389                         kfree(ias_opt);
2390                         err = -EFAULT;
2391                         goto out;
2392                 }
2393                 /* Note : don't need to put optlen, we checked it */
2394                 kfree(ias_opt);
2395                 break;
2396         case IRLMP_IAS_QUERY:
2397                 /* The user want an object from a remote IAS database.
2398                  * We need to use IAP to query the remote database and
2399                  * then wait for the answer to come back. */
2400 
2401                 /* Check that the user has allocated the right space for us */
2402                 if (len != sizeof(struct irda_ias_set)) {
2403                         err = -EINVAL;
2404                         goto out;
2405                 }
2406 
2407                 ias_opt = kmalloc(sizeof(struct irda_ias_set), GFP_ATOMIC);
2408                 if (ias_opt == NULL) {
2409                         err = -ENOMEM;
2410                         goto out;
2411                 }
2412 
2413                 /* Copy query to the driver. */
2414                 if (copy_from_user(ias_opt, optval, len)) {
2415                         kfree(ias_opt);
2416                         err = -EFAULT;
2417                         goto out;
2418                 }
2419 
2420                 /* At this point, there are two cases...
2421                  * 1) the socket is connected - that's the easy case, we
2422                  *      just query the device we are connected to...
2423                  * 2) the socket is not connected - the user doesn't want
2424                  *      to connect and/or may not have a valid service name
2425                  *      (so can't create a fake connection). In this case,
2426                  *      we assume that the user pass us a valid destination
2427                  *      address in the requesting structure...
2428                  */
2429                 if(self->daddr != DEV_ADDR_ANY) {
2430                         /* We are connected - reuse known daddr */
2431                         daddr = self->daddr;
2432                 } else {
2433                         /* We are not connected, we must specify a valid
2434                          * destination address */
2435                         daddr = ias_opt->daddr;
2436                         if((!daddr) || (daddr == DEV_ADDR_ANY)) {
2437                                 kfree(ias_opt);
2438                                 err = -EINVAL;
2439                                 goto out;
2440                         }
2441                 }
2442 
2443                 /* Check that we can proceed with IAP */
2444                 if (self->iriap) {
2445                         IRDA_WARNING("%s: busy with a previous query\n",
2446                                      __func__);
2447                         kfree(ias_opt);
2448                         err = -EBUSY;
2449                         goto out;
2450                 }
2451 
2452                 self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
2453                                          irda_getvalue_confirm);
2454 
2455                 if (self->iriap == NULL) {
2456                         kfree(ias_opt);
2457                         err = -ENOMEM;
2458                         goto out;
2459                 }
2460 
2461                 /* Treat unexpected wakeup as disconnect */
2462                 self->errno = -EHOSTUNREACH;
2463 
2464                 /* Query remote LM-IAS */
2465                 iriap_getvaluebyclass_request(self->iriap,
2466                                               self->saddr, daddr,
2467                                               ias_opt->irda_class_name,
2468                                               ias_opt->irda_attrib_name);
2469 
2470                 /* Wait for answer, if not yet finished (or failed) */
2471                 if (wait_event_interruptible(self->query_wait,
2472                                              (self->iriap == NULL))) {
2473                         /* pending request uses copy of ias_opt-content
2474                          * we can free it regardless! */
2475                         kfree(ias_opt);
2476                         /* Treat signals as disconnect */
2477                         err = -EHOSTUNREACH;
2478                         goto out;
2479                 }
2480 
2481                 /* Check what happened */
2482                 if (self->errno)
2483                 {
2484                         kfree(ias_opt);
2485                         /* Requested object/attribute doesn't exist */
2486                         if((self->errno == IAS_CLASS_UNKNOWN) ||
2487                            (self->errno == IAS_ATTRIB_UNKNOWN))
2488                                 err = -EADDRNOTAVAIL;
2489                         else
2490                                 err = -EHOSTUNREACH;
2491 
2492                         goto out;
2493                 }
2494 
2495                 /* Translate from internal to user structure */
2496                 err = irda_extract_ias_value(ias_opt, self->ias_result);
2497                 if (self->ias_result)
2498                         irias_delete_value(self->ias_result);
2499                 if (err) {
2500                         kfree(ias_opt);
2501                         goto out;
2502                 }
2503 
2504                 /* Copy reply to the user */
2505                 if (copy_to_user(optval, ias_opt,
2506                                  sizeof(struct irda_ias_set))) {
2507                         kfree(ias_opt);
2508                         err = -EFAULT;
2509                         goto out;
2510                 }
2511                 /* Note : don't need to put optlen, we checked it */
2512                 kfree(ias_opt);
2513                 break;
2514         case IRLMP_WAITDEVICE:
2515                 /* This function is just another way of seeing life ;-)
2516                  * IRLMP_ENUMDEVICES assumes that you have a static network,
2517                  * and that you just want to pick one of the devices present.
2518                  * On the other hand, in here we assume that no device is
2519                  * present and that at some point in the future a device will
2520                  * come into range. When this device arrive, we just wake
2521                  * up the caller, so that he has time to connect to it before
2522                  * the device goes away...
2523                  * Note : once the node has been discovered for more than a
2524                  * few second, it won't trigger this function, unless it
2525                  * goes away and come back changes its hint bits (so we
2526                  * might call it IRLMP_WAITNEWDEVICE).
2527                  */
2528 
2529                 /* Check that the user is passing us an int */
2530                 if (len != sizeof(int)) {
2531                         err = -EINVAL;
2532                         goto out;
2533                 }
2534                 /* Get timeout in ms (max time we block the caller) */
2535                 if (get_user(val, (int __user *)optval)) {
2536                         err = -EFAULT;
2537                         goto out;
2538                 }
2539 
2540                 /* Tell IrLMP we want to be notified */
2541                 irlmp_update_client(self->ckey, self->mask.word,
2542                                     irda_selective_discovery_indication,
2543                                     NULL, (void *) self);
2544 
2545                 /* Do some discovery (and also return cached results) */
2546                 irlmp_discovery_request(self->nslots);
2547 
2548                 /* Wait until a node is discovered */
2549                 if (!self->cachedaddr) {
2550                         IRDA_DEBUG(1, "%s(), nothing discovered yet, going to sleep...\n", __func__);
2551 
2552                         /* Set watchdog timer to expire in <val> ms. */
2553                         self->errno = 0;
2554                         setup_timer(&self->watchdog, irda_discovery_timeout,
2555                                         (unsigned long)self);
2556                         mod_timer(&self->watchdog,
2557                                   jiffies + msecs_to_jiffies(val));
2558 
2559                         /* Wait for IR-LMP to call us back */
2560                         err = __wait_event_interruptible(self->query_wait,
2561                               (self->cachedaddr != 0 || self->errno == -ETIME));
2562 
2563                         /* If watchdog is still activated, kill it! */
2564                         del_timer(&(self->watchdog));
2565 
2566                         IRDA_DEBUG(1, "%s(), ...waking up !\n", __func__);
2567 
2568                         if (err != 0)
2569                                 goto out;
2570                 }
2571                 else
2572                         IRDA_DEBUG(1, "%s(), found immediately !\n",
2573                                    __func__);
2574 
2575                 /* Tell IrLMP that we have been notified */
2576                 irlmp_update_client(self->ckey, self->mask.word,
2577                                     NULL, NULL, NULL);
2578 
2579                 /* Check if the we got some results */
2580                 if (!self->cachedaddr) {
2581                         err = -EAGAIN;          /* Didn't find any devices */
2582                         goto out;
2583                 }
2584                 daddr = self->cachedaddr;
2585                 /* Cleanup */
2586                 self->cachedaddr = 0;
2587 
2588                 /* We return the daddr of the device that trigger the
2589                  * wakeup. As irlmp pass us only the new devices, we
2590                  * are sure that it's not an old device.
2591                  * If the user want more details, he should query
2592                  * the whole discovery log and pick one device...
2593                  */
2594                 if (put_user(daddr, (int __user *)optval)) {
2595                         err = -EFAULT;
2596                         goto out;
2597                 }
2598 
2599                 break;
2600         default:
2601                 err = -ENOPROTOOPT;
2602         }
2603 
2604 out:
2605 
2606         release_sock(sk);
2607 
2608         return err;
2609 }
2610 
2611 static const struct net_proto_family irda_family_ops = {
2612         .family = PF_IRDA,
2613         .create = irda_create,
2614         .owner  = THIS_MODULE,
2615 };
2616 
2617 static const struct proto_ops irda_stream_ops = {
2618         .family =       PF_IRDA,
2619         .owner =        THIS_MODULE,
2620         .release =      irda_release,
2621         .bind =         irda_bind,
2622         .connect =      irda_connect,
2623         .socketpair =   sock_no_socketpair,
2624         .accept =       irda_accept,
2625         .getname =      irda_getname,
2626         .poll =         irda_poll,
2627         .ioctl =        irda_ioctl,
2628 #ifdef CONFIG_COMPAT
2629         .compat_ioctl = irda_compat_ioctl,
2630 #endif
2631         .listen =       irda_listen,
2632         .shutdown =     irda_shutdown,
2633         .setsockopt =   irda_setsockopt,
2634         .getsockopt =   irda_getsockopt,
2635         .sendmsg =      irda_sendmsg,
2636         .recvmsg =      irda_recvmsg_stream,
2637         .mmap =         sock_no_mmap,
2638         .sendpage =     sock_no_sendpage,
2639 };
2640 
2641 static const struct proto_ops irda_seqpacket_ops = {
2642         .family =       PF_IRDA,
2643         .owner =        THIS_MODULE,
2644         .release =      irda_release,
2645         .bind =         irda_bind,
2646         .connect =      irda_connect,
2647         .socketpair =   sock_no_socketpair,
2648         .accept =       irda_accept,
2649         .getname =      irda_getname,
2650         .poll =         datagram_poll,
2651         .ioctl =        irda_ioctl,
2652 #ifdef CONFIG_COMPAT
2653         .compat_ioctl = irda_compat_ioctl,
2654 #endif
2655         .listen =       irda_listen,
2656         .shutdown =     irda_shutdown,
2657         .setsockopt =   irda_setsockopt,
2658         .getsockopt =   irda_getsockopt,
2659         .sendmsg =      irda_sendmsg,
2660         .recvmsg =      irda_recvmsg_dgram,
2661         .mmap =         sock_no_mmap,
2662         .sendpage =     sock_no_sendpage,
2663 };
2664 
2665 static const struct proto_ops irda_dgram_ops = {
2666         .family =       PF_IRDA,
2667         .owner =        THIS_MODULE,
2668         .release =      irda_release,
2669         .bind =         irda_bind,
2670         .connect =      irda_connect,
2671         .socketpair =   sock_no_socketpair,
2672         .accept =       irda_accept,
2673         .getname =      irda_getname,
2674         .poll =         datagram_poll,
2675         .ioctl =        irda_ioctl,
2676 #ifdef CONFIG_COMPAT
2677         .compat_ioctl = irda_compat_ioctl,
2678 #endif
2679         .listen =       irda_listen,
2680         .shutdown =     irda_shutdown,
2681         .setsockopt =   irda_setsockopt,
2682         .getsockopt =   irda_getsockopt,
2683         .sendmsg =      irda_sendmsg_dgram,
2684         .recvmsg =      irda_recvmsg_dgram,
2685         .mmap =         sock_no_mmap,
2686         .sendpage =     sock_no_sendpage,
2687 };
2688 
2689 #ifdef CONFIG_IRDA_ULTRA
2690 static const struct proto_ops irda_ultra_ops = {
2691         .family =       PF_IRDA,
2692         .owner =        THIS_MODULE,
2693         .release =      irda_release,
2694         .bind =         irda_bind,
2695         .connect =      sock_no_connect,
2696         .socketpair =   sock_no_socketpair,
2697         .accept =       sock_no_accept,
2698         .getname =      irda_getname,
2699         .poll =         datagram_poll,
2700         .ioctl =        irda_ioctl,
2701 #ifdef CONFIG_COMPAT
2702         .compat_ioctl = irda_compat_ioctl,
2703 #endif
2704         .listen =       sock_no_listen,
2705         .shutdown =     irda_shutdown,
2706         .setsockopt =   irda_setsockopt,
2707         .getsockopt =   irda_getsockopt,
2708         .sendmsg =      irda_sendmsg_ultra,
2709         .recvmsg =      irda_recvmsg_dgram,
2710         .mmap =         sock_no_mmap,
2711         .sendpage =     sock_no_sendpage,
2712 };
2713 #endif /* CONFIG_IRDA_ULTRA */
2714 
2715 /*
2716  * Function irsock_init (pro)
2717  *
2718  *    Initialize IrDA protocol
2719  *
2720  */
2721 int __init irsock_init(void)
2722 {
2723         int rc = proto_register(&irda_proto, 0);
2724 
2725         if (rc == 0)
2726                 rc = sock_register(&irda_family_ops);
2727 
2728         return rc;
2729 }
2730 
2731 /*
2732  * Function irsock_cleanup (void)
2733  *
2734  *    Remove IrDA protocol
2735  *
2736  */
2737 void irsock_cleanup(void)
2738 {
2739         sock_unregister(PF_IRDA);
2740         proto_unregister(&irda_proto);
2741 }
2742 

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