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

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