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

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