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TOMOYO Linux Cross Reference
Linux/net/atm/common.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /* net/atm/common.c - ATM sockets (common part for PVC and SVC) */
  3 
  4 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
  5 
  6 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
  7 
  8 #include <linux/module.h>
  9 #include <linux/kmod.h>
 10 #include <linux/net.h>          /* struct socket, struct proto_ops */
 11 #include <linux/atm.h>          /* ATM stuff */
 12 #include <linux/atmdev.h>
 13 #include <linux/socket.h>       /* SOL_SOCKET */
 14 #include <linux/errno.h>        /* error codes */
 15 #include <linux/capability.h>
 16 #include <linux/mm.h>
 17 #include <linux/sched/signal.h>
 18 #include <linux/time64.h>       /* 64-bit time for seconds */
 19 #include <linux/skbuff.h>
 20 #include <linux/bitops.h>
 21 #include <linux/init.h>
 22 #include <linux/slab.h>
 23 #include <net/sock.h>           /* struct sock */
 24 #include <linux/uaccess.h>
 25 #include <linux/poll.h>
 26 
 27 #include <linux/atomic.h>
 28 
 29 #include "resources.h"          /* atm_find_dev */
 30 #include "common.h"             /* prototypes */
 31 #include "<protocols.h"          /* atm_init_<transport?v=linux-5.13.19">a href="source/net/atm/protocols.h?v=linux-5.13.19">protocols.h"          /* atm_init_<transport> */
 32 #include "addr.h"               /* address registry */
 33 #include "signaling.h"          /* for WAITING and sigd_attach */
 34 
 35 struct hlist_head vcc_hash[VCC_HTABLE_SIZE];
 36 EXPORT_SYMBOL(vcc_hash);
 37 
 38 DEFINE_RWLOCK(vcc_sklist_lock);
 39 EXPORT_SYMBOL(vcc_sklist_lock);
 40 
 41 static ATOMIC_NOTIFIER_HEAD(atm_dev_notify_chain);
 42 
 43 static void __vcc_insert_socket(struct sock *sk)
 44 {
 45         struct atm_vcc *vcc = atm_sk(sk);
 46         struct hlist_head *head = &vcc_hash[vcc->vci & (VCC_HTABLE_SIZE - 1)];
 47         sk->sk_hash = vcc->vci & (VCC_HTABLE_SIZE - 1);
 48         sk_add_node(sk, head);
 49 }
 50 
 51 void vcc_insert_socket(struct sock *sk)
 52 {
 53         write_lock_irq(&vcc_sklist_lock);
 54         __vcc_insert_socket(sk);
 55         write_unlock_irq(&vcc_sklist_lock);
 56 }
 57 EXPORT_SYMBOL(vcc_insert_socket);
 58 
 59 static void vcc_remove_socket(struct sock *sk)
 60 {
 61         write_lock_irq(&vcc_sklist_lock);
 62         sk_del_node_init(sk);
 63         write_unlock_irq(&vcc_sklist_lock);
 64 }
 65 
 66 static bool vcc_tx_ready(struct atm_vcc *vcc, unsigned int size)
 67 {
 68         struct sock *sk = sk_atm(vcc);
 69 
 70         if (sk_wmem_alloc_get(sk) && !atm_may_send(vcc, size)) {
 71                 pr_debug("Sorry: wmem_alloc = %d, size = %d, sndbuf = %d\n",
 72                          sk_wmem_alloc_get(sk), size, sk->sk_sndbuf);
 73                 return false;
 74         }
 75         return true;
 76 }
 77 
 78 static void vcc_sock_destruct(struct sock *sk)
 79 {
 80         if (atomic_read(&sk->sk_rmem_alloc))
 81                 printk(KERN_DEBUG "%s: rmem leakage (%d bytes) detected.\n",
 82                        __func__, atomic_read(&sk->sk_rmem_alloc));
 83 
 84         if (refcount_read(&sk->sk_wmem_alloc))
 85                 printk(KERN_DEBUG "%s: wmem leakage (%d bytes) detected.\n",
 86                        __func__, refcount_read(&sk->sk_wmem_alloc));
 87 }
 88 
 89 static void vcc_def_wakeup(struct sock *sk)
 90 {
 91         struct socket_wq *wq;
 92 
 93         rcu_read_lock();
 94         wq = rcu_dereference(sk->sk_wq);
 95         if (skwq_has_sleeper(wq))
 96                 wake_up(&wq->wait);
 97         rcu_read_unlock();
 98 }
 99 
100 static inline int vcc_writable(struct sock *sk)
101 {
102         struct atm_vcc *vcc = atm_sk(sk);
103 
104         return (vcc->qos.txtp.max_sdu +
105                 refcount_read(&sk->sk_wmem_alloc)) <= sk->sk_sndbuf;
106 }
107 
108 static void vcc_write_space(struct sock *sk)
109 {
110         struct socket_wq *wq;
111 
112         rcu_read_lock();
113 
114         if (vcc_writable(sk)) {
115                 wq = rcu_dereference(sk->sk_wq);
116                 if (skwq_has_sleeper(wq))
117                         wake_up_interruptible(&wq->wait);
118 
119                 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
120         }
121 
122         rcu_read_unlock();
123 }
124 
125 static void vcc_release_cb(struct sock *sk)
126 {
127         struct atm_vcc *vcc = atm_sk(sk);
128 
129         if (vcc->release_cb)
130                 vcc->release_cb(vcc);
131 }
132 
133 static struct proto vcc_proto = {
134         .name     = "VCC",
135         .owner    = THIS_MODULE,
136         .obj_size = sizeof(struct atm_vcc),
137         .release_cb = vcc_release_cb,
138 };
139 
140 int vcc_create(struct net *net, struct socket *sock, int protocol, int family, int kern)
141 {
142         struct sock *sk;
143         struct atm_vcc *vcc;
144 
145         sock->sk = NULL;
146         if (sock->type == SOCK_STREAM)
147                 return -EINVAL;
148         sk = sk_alloc(net, family, GFP_KERNEL, &vcc_proto, kern);
149         if (!sk)
150                 return -ENOMEM;
151         sock_init_data(sock, sk);
152         sk->sk_state_change = vcc_def_wakeup;
153         sk->sk_write_space = vcc_write_space;
154 
155         vcc = atm_sk(sk);
156         vcc->dev = NULL;
157         memset(&vcc->local, 0, sizeof(struct sockaddr_atmsvc));
158         memset(&vcc->remote, 0, sizeof(struct sockaddr_atmsvc));
159         vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */
160         refcount_set(&sk->sk_wmem_alloc, 1);
161         atomic_set(&sk->sk_rmem_alloc, 0);
162         vcc->push = NULL;
163         vcc->pop = NULL;
164         vcc->owner = NULL;
165         vcc->push_oam = NULL;
166         vcc->release_cb = NULL;
167         vcc->vpi = vcc->vci = 0; /* no VCI/VPI yet */
168         vcc->atm_options = vcc->aal_options = 0;
169         sk->sk_destruct = vcc_sock_destruct;
170         return 0;
171 }
172 
173 static void vcc_destroy_socket(struct sock *sk)
174 {
175         struct atm_vcc *vcc = atm_sk(sk);
176         struct sk_buff *skb;
177 
178         set_bit(ATM_VF_CLOSE, &vcc->flags);
179         clear_bit(ATM_VF_READY, &vcc->flags);
180         if (vcc->dev && vcc->dev->ops->close)
181                 vcc->dev->ops->close(vcc);
182         if (vcc->push)
183                 vcc->push(vcc, NULL); /* atmarpd has no push */
184         module_put(vcc->owner);
185 
186         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
187                 atm_return(vcc, skb->truesize);
188                 kfree_skb(skb);
189         }
190 
191         if (vcc->dev && vcc->dev->ops->owner) {
192                 module_put(vcc->dev->ops->owner);
193                 atm_dev_put(vcc->dev);
194         }
195 
196         vcc_remove_socket(sk);
197 }
198 
199 int vcc_release(struct socket *sock)
200 {
201         struct sock *sk = sock->sk;
202 
203         if (sk) {
204                 lock_sock(sk);
205                 vcc_destroy_socket(sock->sk);
206                 release_sock(sk);
207                 sock_put(sk);
208         }
209 
210         return 0;
211 }
212 
213 void vcc_release_async(struct atm_vcc *vcc, int reply)
214 {
215         struct sock *sk = sk_atm(vcc);
216 
217         set_bit(ATM_VF_CLOSE, &vcc->flags);
218         sk->sk_shutdown |= RCV_SHUTDOWN;
219         sk->sk_err = -reply;
220         clear_bit(ATM_VF_WAITING, &vcc->flags);
221         sk->sk_state_change(sk);
222 }
223 EXPORT_SYMBOL(vcc_release_async);
224 
225 void vcc_process_recv_queue(struct atm_vcc *vcc)
226 {
227         struct sk_buff_head queue, *rq;
228         struct sk_buff *skb, *tmp;
229         unsigned long flags;
230 
231         __skb_queue_head_init(&queue);
232         rq = &sk_atm(vcc)->sk_receive_queue;
233 
234         spin_lock_irqsave(&rq->lock, flags);
235         skb_queue_splice_init(rq, &queue);
236         spin_unlock_irqrestore(&rq->lock, flags);
237 
238         skb_queue_walk_safe(&queue, skb, tmp) {
239                 __skb_unlink(skb, &queue);
240                 vcc->push(vcc, skb);
241         }
242 }
243 EXPORT_SYMBOL(vcc_process_recv_queue);
244 
245 void atm_dev_signal_change(struct atm_dev *dev, char signal)
246 {
247         pr_debug("%s signal=%d dev=%p number=%d dev->signal=%d\n",
248                 __func__, signal, dev, dev->number, dev->signal);
249 
250         /* atm driver sending invalid signal */
251         WARN_ON(signal < ATM_PHY_SIG_LOST || signal > ATM_PHY_SIG_FOUND);
252 
253         if (dev->signal == signal)
254                 return; /* no change */
255 
256         dev->signal = signal;
257 
258         atomic_notifier_call_chain(&atm_dev_notify_chain, signal, dev);
259 }
260 EXPORT_SYMBOL(atm_dev_signal_change);
261 
262 void atm_dev_release_vccs(struct atm_dev *dev)
263 {
264         int i;
265 
266         write_lock_irq(&vcc_sklist_lock);
267         for (i = 0; i < VCC_HTABLE_SIZE; i++) {
268                 struct hlist_head *head = &vcc_hash[i];
269                 struct hlist_node *tmp;
270                 struct sock *s;
271                 struct atm_vcc *vcc;
272 
273                 sk_for_each_safe(s, tmp, head) {
274                         vcc = atm_sk(s);
275                         if (vcc->dev == dev) {
276                                 vcc_release_async(vcc, -EPIPE);
277                                 sk_del_node_init(s);
278                         }
279                 }
280         }
281         write_unlock_irq(&vcc_sklist_lock);
282 }
283 EXPORT_SYMBOL(atm_dev_release_vccs);
284 
285 static int adjust_tp(struct atm_trafprm *tp, unsigned char aal)
286 {
287         int max_sdu;
288 
289         if (!tp->traffic_class)
290                 return 0;
291         switch (aal) {
292         case ATM_AAL0:
293                 max_sdu = ATM_CELL_SIZE-1;
294                 break;
295         case ATM_AAL34:
296                 max_sdu = ATM_MAX_AAL34_PDU;
297                 break;
298         default:
299                 pr_warn("AAL problems ... (%d)\n", aal);
300                 fallthrough;
301         case ATM_AAL5:
302                 max_sdu = ATM_MAX_AAL5_PDU;
303         }
304         if (!tp->max_sdu)
305                 tp->max_sdu = max_sdu;
306         else if (tp->max_sdu > max_sdu)
307                 return -EINVAL;
308         if (!tp->max_cdv)
309                 tp->max_cdv = ATM_MAX_CDV;
310         return 0;
311 }
312 
313 static int check_ci(const struct atm_vcc *vcc, short vpi, int vci)
314 {
315         struct hlist_head *head = &vcc_hash[vci & (VCC_HTABLE_SIZE - 1)];
316         struct sock *s;
317         struct atm_vcc *walk;
318 
319         sk_for_each(s, head) {
320                 walk = atm_sk(s);
321                 if (walk->dev != vcc->dev)
322                         continue;
323                 if (test_bit(ATM_VF_ADDR, &walk->flags) && walk->vpi == vpi &&
324                     walk->vci == vci && ((walk->qos.txtp.traffic_class !=
325                     ATM_NONE && vcc->qos.txtp.traffic_class != ATM_NONE) ||
326                     (walk->qos.rxtp.traffic_class != ATM_NONE &&
327                     vcc->qos.rxtp.traffic_class != ATM_NONE)))
328                         return -EADDRINUSE;
329         }
330 
331         /* allow VCCs with same VPI/VCI iff they don't collide on
332            TX/RX (but we may refuse such sharing for other reasons,
333            e.g. if protocol requires to have both channels) */
334 
335         return 0;
336 }
337 
338 static int find_ci(const struct atm_vcc *vcc, short *vpi, int *vci)
339 {
340         static short p;        /* poor man's per-device cache */
341         static int c;
342         short old_p;
343         int old_c;
344         int err;
345 
346         if (*vpi != ATM_VPI_ANY && *vci != ATM_VCI_ANY) {
347                 err = check_ci(vcc, *vpi, *vci);
348                 return err;
349         }
350         /* last scan may have left values out of bounds for current device */
351         if (*vpi != ATM_VPI_ANY)
352                 p = *vpi;
353         else if (p >= 1 << vcc->dev->ci_range.vpi_bits)
354                 p = 0;
355         if (*vci != ATM_VCI_ANY)
356                 c = *vci;
357         else if (c < ATM_NOT_RSV_VCI || c >= 1 << vcc->dev->ci_range.vci_bits)
358                         c = ATM_NOT_RSV_VCI;
359         old_p = p;
360         old_c = c;
361         do {
362                 if (!check_ci(vcc, p, c)) {
363                         *vpi = p;
364                         *vci = c;
365                         return 0;
366                 }
367                 if (*vci == ATM_VCI_ANY) {
368                         c++;
369                         if (c >= 1 << vcc->dev->ci_range.vci_bits)
370                                 c = ATM_NOT_RSV_VCI;
371                 }
372                 if ((c == ATM_NOT_RSV_VCI || *vci != ATM_VCI_ANY) &&
373                     *vpi == ATM_VPI_ANY) {
374                         p++;
375                         if (p >= 1 << vcc->dev->ci_range.vpi_bits)
376                                 p = 0;
377                 }
378         } while (old_p != p || old_c != c);
379         return -EADDRINUSE;
380 }
381 
382 static int __vcc_connect(struct atm_vcc *vcc, struct atm_dev *dev, short vpi,
383                          int vci)
384 {
385         struct sock *sk = sk_atm(vcc);
386         int error;
387 
388         if ((vpi != ATM_VPI_UNSPEC && vpi != ATM_VPI_ANY &&
389             vpi >> dev->ci_range.vpi_bits) || (vci != ATM_VCI_UNSPEC &&
390             vci != ATM_VCI_ANY && vci >> dev->ci_range.vci_bits))
391                 return -EINVAL;
392         if (vci > 0 && vci < ATM_NOT_RSV_VCI && !capable(CAP_NET_BIND_SERVICE))
393                 return -EPERM;
394         error = -ENODEV;
395         if (!try_module_get(dev->ops->owner))
396                 return error;
397         vcc->dev = dev;
398         write_lock_irq(&vcc_sklist_lock);
399         if (test_bit(ATM_DF_REMOVED, &dev->flags) ||
400             (error = find_ci(vcc, &vpi, &vci))) {
401                 write_unlock_irq(&vcc_sklist_lock);
402                 goto fail_module_put;
403         }
404         vcc->vpi = vpi;
405         vcc->vci = vci;
406         __vcc_insert_socket(sk);
407         write_unlock_irq(&vcc_sklist_lock);
408         switch (vcc->qos.aal) {
409         case ATM_AAL0:
410                 error = atm_init_aal0(vcc);
411                 vcc->stats = &dev->stats.aal0;
412                 break;
413         case ATM_AAL34:
414                 error = atm_init_aal34(vcc);
415                 vcc->stats = &dev->stats.aal34;
416                 break;
417         case ATM_NO_AAL:
418                 /* ATM_AAL5 is also used in the "0 for default" case */
419                 vcc->qos.aal = ATM_AAL5;
420                 fallthrough;
421         case ATM_AAL5:
422                 error = atm_init_aal5(vcc);
423                 vcc->stats = &dev->stats.aal5;
424                 break;
425         default:
426                 error = -EPROTOTYPE;
427         }
428         if (!error)
429                 error = adjust_tp(&vcc->qos.txtp, vcc->qos.aal);
430         if (!error)
431                 error = adjust_tp(&vcc->qos.rxtp, vcc->qos.aal);
432         if (error)
433                 goto fail;
434         pr_debug("VCC %d.%d, AAL %d\n", vpi, vci, vcc->qos.aal);
435         pr_debug("  TX: %d, PCR %d..%d, SDU %d\n",
436                  vcc->qos.txtp.traffic_class,
437                  vcc->qos.txtp.min_pcr,
438                  vcc->qos.txtp.max_pcr,
439                  vcc->qos.txtp.max_sdu);
440         pr_debug("  RX: %d, PCR %d..%d, SDU %d\n",
441                  vcc->qos.rxtp.traffic_class,
442                  vcc->qos.rxtp.min_pcr,
443                  vcc->qos.rxtp.max_pcr,
444                  vcc->qos.rxtp.max_sdu);
445 
446         if (dev->ops->open) {
447                 error = dev->ops->open(vcc);
448                 if (error)
449                         goto fail;
450         }
451         return 0;
452 
453 fail:
454         vcc_remove_socket(sk);
455 fail_module_put:
456         module_put(dev->ops->owner);
457         /* ensure we get dev module ref count correct */
458         vcc->dev = NULL;
459         return error;
460 }
461 
462 int vcc_connect(struct socket *sock, int itf, short vpi, int vci)
463 {
464         struct atm_dev *dev;
465         struct atm_vcc *vcc = ATM_SD(sock);
466         int error;
467 
468         pr_debug("(vpi %d, vci %d)\n", vpi, vci);
469         if (sock->state == SS_CONNECTED)
470                 return -EISCONN;
471         if (sock->state != SS_UNCONNECTED)
472                 return -EINVAL;
473         if (!(vpi || vci))
474                 return -EINVAL;
475 
476         if (vpi != ATM_VPI_UNSPEC && vci != ATM_VCI_UNSPEC)
477                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
478         else
479                 if (test_bit(ATM_VF_PARTIAL, &vcc->flags))
480                         return -EINVAL;
481         pr_debug("(TX: cl %d,bw %d-%d,sdu %d; "
482                  "RX: cl %d,bw %d-%d,sdu %d,AAL %s%d)\n",
483                  vcc->qos.txtp.traffic_class, vcc->qos.txtp.min_pcr,
484                  vcc->qos.txtp.max_pcr, vcc->qos.txtp.max_sdu,
485                  vcc->qos.rxtp.traffic_class, vcc->qos.rxtp.min_pcr,
486                  vcc->qos.rxtp.max_pcr, vcc->qos.rxtp.max_sdu,
487                  vcc->qos.aal == ATM_AAL5 ? "" :
488                  vcc->qos.aal == ATM_AAL0 ? "" : " ??? code ",
489                  vcc->qos.aal == ATM_AAL0 ? 0 : vcc->qos.aal);
490         if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
491                 return -EBADFD;
492         if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
493             vcc->qos.rxtp.traffic_class == ATM_ANYCLASS)
494                 return -EINVAL;
495         if (likely(itf != ATM_ITF_ANY)) {
496                 dev = try_then_request_module(atm_dev_lookup(itf),
497                                               "atm-device-%d", itf);
498         } else {
499                 dev = NULL;
500                 mutex_lock(&atm_dev_mutex);
501                 if (!list_empty(&atm_devs)) {
502                         dev = list_entry(atm_devs.next,
503                                          struct atm_dev, dev_list);
504                         atm_dev_hold(dev);
505                 }
506                 mutex_unlock(&atm_dev_mutex);
507         }
508         if (!dev)
509                 return -ENODEV;
510         error = __vcc_connect(vcc, dev, vpi, vci);
511         if (error) {
512                 atm_dev_put(dev);
513                 return error;
514         }
515         if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC)
516                 set_bit(ATM_VF_PARTIAL, &vcc->flags);
517         if (test_bit(ATM_VF_READY, &ATM_SD(sock)->flags))
518                 sock->state = SS_CONNECTED;
519         return 0;
520 }
521 
522 int vcc_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
523                 int flags)
524 {
525         struct sock *sk = sock->sk;
526         struct atm_vcc *vcc;
527         struct sk_buff *skb;
528         int copied, error = -EINVAL;
529 
530         if (sock->state != SS_CONNECTED)
531                 return -ENOTCONN;
532 
533         /* only handle MSG_DONTWAIT and MSG_PEEK */
534         if (flags & ~(MSG_DONTWAIT | MSG_PEEK))
535                 return -EOPNOTSUPP;
536 
537         vcc = ATM_SD(sock);
538         if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
539             test_bit(ATM_VF_CLOSE, &vcc->flags) ||
540             !test_bit(ATM_VF_READY, &vcc->flags))
541                 return 0;
542 
543         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &error);
544         if (!skb)
545                 return error;
546 
547         copied = skb->len;
548         if (copied > size) {
549                 copied = size;
550                 msg->msg_flags |= MSG_TRUNC;
551         }
552 
553         error = skb_copy_datagram_msg(skb, 0, msg, copied);
554         if (error)
555                 return error;
556         sock_recv_ts_and_drops(msg, sk, skb);
557 
558         if (!(flags & MSG_PEEK)) {
559                 pr_debug("%d -= %d\n", atomic_read(&sk->sk_rmem_alloc),
560                          skb->truesize);
561                 atm_return(vcc, skb->truesize);
562         }
563 
564         skb_free_datagram(sk, skb);
565         return copied;
566 }
567 
568 int vcc_sendmsg(struct socket *sock, struct msghdr *m, size_t size)
569 {
570         struct sock *sk = sock->sk;
571         DEFINE_WAIT(wait);
572         struct atm_vcc *vcc;
573         struct sk_buff *skb;
574         int eff, error;
575 
576         lock_sock(sk);
577         if (sock->state != SS_CONNECTED) {
578                 error = -ENOTCONN;
579                 goto out;
580         }
581         if (m->msg_name) {
582                 error = -EISCONN;
583                 goto out;
584         }
585         vcc = ATM_SD(sock);
586         if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
587             test_bit(ATM_VF_CLOSE, &vcc->flags) ||
588             !test_bit(ATM_VF_READY, &vcc->flags)) {
589                 error = -EPIPE;
590                 send_sig(SIGPIPE, current, 0);
591                 goto out;
592         }
593         if (!size) {
594                 error = 0;
595                 goto out;
596         }
597         if (size > vcc->qos.txtp.max_sdu) {
598                 error = -EMSGSIZE;
599                 goto out;
600         }
601 
602         eff = (size+3) & ~3; /* align to word boundary */
603         prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
604         error = 0;
605         while (!vcc_tx_ready(vcc, eff)) {
606                 if (m->msg_flags & MSG_DONTWAIT) {
607                         error = -EAGAIN;
608                         break;
609                 }
610                 schedule();
611                 if (signal_pending(current)) {
612                         error = -ERESTARTSYS;
613                         break;
614                 }
615                 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
616                     test_bit(ATM_VF_CLOSE, &vcc->flags) ||
617                     !test_bit(ATM_VF_READY, &vcc->flags)) {
618                         error = -EPIPE;
619                         send_sig(SIGPIPE, current, 0);
620                         break;
621                 }
622                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
623         }
624         finish_wait(sk_sleep(sk), &wait);
625         if (error)
626                 goto out;
627 
628         skb = alloc_skb(eff, GFP_KERNEL);
629         if (!skb) {
630                 error = -ENOMEM;
631                 goto out;
632         }
633         pr_debug("%d += %d\n", sk_wmem_alloc_get(sk), skb->truesize);
634         atm_account_tx(vcc, skb);
635 
636         skb->dev = NULL; /* for paths shared with net_device interfaces */
637         if (!copy_from_iter_full(skb_put(skb, size), size, &m->msg_iter)) {
638                 kfree_skb(skb);
639                 error = -EFAULT;
640                 goto out;
641         }
642         if (eff != size)
643                 memset(skb->data + size, 0, eff-size);
644         error = vcc->dev->ops->send(vcc, skb);
645         error = error ? error : size;
646 out:
647         release_sock(sk);
648         return error;
649 }
650 
651 __poll_t vcc_poll(struct file *file, struct socket *sock, poll_table *wait)
652 {
653         struct sock *sk = sock->sk;
654         struct atm_vcc *vcc;
655         __poll_t mask;
656 
657         sock_poll_wait(file, sock, wait);
658         mask = 0;
659 
660         vcc = ATM_SD(sock);
661 
662         /* exceptional events */
663         if (sk->sk_err)
664                 mask = EPOLLERR;
665 
666         if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
667             test_bit(ATM_VF_CLOSE, &vcc->flags))
668                 mask |= EPOLLHUP;
669 
670         /* readable? */
671         if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
672                 mask |= EPOLLIN | EPOLLRDNORM;
673 
674         /* writable? */
675         if (sock->state == SS_CONNECTING &&
676             test_bit(ATM_VF_WAITING, &vcc->flags))
677                 return mask;
678 
679         if (vcc->qos.txtp.traffic_class != ATM_NONE &&
680             vcc_writable(sk))
681                 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
682 
683         return mask;
684 }
685 
686 static int atm_change_qos(struct atm_vcc *vcc, struct atm_qos *qos)
687 {
688         int error;
689 
690         /*
691          * Don't let the QoS change the already connected AAL type nor the
692          * traffic class.
693          */
694         if (qos->aal != vcc->qos.aal ||
695             qos->rxtp.traffic_class != vcc->qos.rxtp.traffic_class ||
696             qos->txtp.traffic_class != vcc->qos.txtp.traffic_class)
697                 return -EINVAL;
698         error = adjust_tp(&qos->txtp, qos->aal);
699         if (!error)
700                 error = adjust_tp(&qos->rxtp, qos->aal);
701         if (error)
702                 return error;
703         if (!vcc->dev->ops->change_qos)
704                 return -EOPNOTSUPP;
705         if (sk_atm(vcc)->sk_family == AF_ATMPVC)
706                 return vcc->dev->ops->change_qos(vcc, qos, ATM_MF_SET);
707         return svc_change_qos(vcc, qos);
708 }
709 
710 static int check_tp(const struct atm_trafprm *tp)
711 {
712         /* @@@ Should be merged with adjust_tp */
713         if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS)
714                 return 0;
715         if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr &&
716             !tp->max_pcr)
717                 return -EINVAL;
718         if (tp->min_pcr == ATM_MAX_PCR)
719                 return -EINVAL;
720         if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR &&
721             tp->min_pcr > tp->max_pcr)
722                 return -EINVAL;
723         /*
724          * We allow pcr to be outside [min_pcr,max_pcr], because later
725          * adjustment may still push it in the valid range.
726          */
727         return 0;
728 }
729 
730 static int check_qos(const struct atm_qos *qos)
731 {
732         int error;
733 
734         if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class)
735                 return -EINVAL;
736         if (qos->txtp.traffic_class != qos->rxtp.traffic_class &&
737             qos->txtp.traffic_class && qos->rxtp.traffic_class &&
738             qos->txtp.traffic_class != ATM_ANYCLASS &&
739             qos->rxtp.traffic_class != ATM_ANYCLASS)
740                 return -EINVAL;
741         error = check_tp(&qos->txtp);
742         if (error)
743                 return error;
744         return check_tp(&qos->rxtp);
745 }
746 
747 int vcc_setsockopt(struct socket *sock, int level, int optname,
748                    sockptr_t optval, unsigned int optlen)
749 {
750         struct atm_vcc *vcc;
751         unsigned long value;
752         int error;
753 
754         if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname))
755                 return -EINVAL;
756 
757         vcc = ATM_SD(sock);
758         switch (optname) {
759         case SO_ATMQOS:
760         {
761                 struct atm_qos qos;
762 
763                 if (copy_from_sockptr(&qos, optval, sizeof(qos)))
764                         return -EFAULT;
765                 error = check_qos(&qos);
766                 if (error)
767                         return error;
768                 if (sock->state == SS_CONNECTED)
769                         return atm_change_qos(vcc, &qos);
770                 if (sock->state != SS_UNCONNECTED)
771                         return -EBADFD;
772                 vcc->qos = qos;
773                 set_bit(ATM_VF_HASQOS, &vcc->flags);
774                 return 0;
775         }
776         case SO_SETCLP:
777                 if (copy_from_sockptr(&value, optval, sizeof(value)))
778                         return -EFAULT;
779                 if (value)
780                         vcc->atm_options |= ATM_ATMOPT_CLP;
781                 else
782                         vcc->atm_options &= ~ATM_ATMOPT_CLP;
783                 return 0;
784         default:
785                 return -EINVAL;
786         }
787 }
788 
789 int vcc_getsockopt(struct socket *sock, int level, int optname,
790                    char __user *optval, int __user *optlen)
791 {
792         struct atm_vcc *vcc;
793         int len;
794 
795         if (get_user(len, optlen))
796                 return -EFAULT;
797         if (__SO_LEVEL_MATCH(optname, level) && len != __SO_SIZE(optname))
798                 return -EINVAL;
799 
800         vcc = ATM_SD(sock);
801         switch (optname) {
802         case SO_ATMQOS:
803                 if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
804                         return -EINVAL;
805                 return copy_to_user(optval, &vcc->qos, sizeof(vcc->qos))
806                         ? -EFAULT : 0;
807         case SO_SETCLP:
808                 return put_user(vcc->atm_options & ATM_ATMOPT_CLP ? 1 : 0,
809                                 (unsigned long __user *)optval) ? -EFAULT : 0;
810         case SO_ATMPVC:
811         {
812                 struct sockaddr_atmpvc pvc;
813 
814                 if (!vcc->dev || !test_bit(ATM_VF_ADDR, &vcc->flags))
815                         return -ENOTCONN;
816                 memset(&pvc, 0, sizeof(pvc));
817                 pvc.sap_family = AF_ATMPVC;
818                 pvc.sap_addr.itf = vcc->dev->number;
819                 pvc.sap_addr.vpi = vcc->vpi;
820                 pvc.sap_addr.vci = vcc->vci;
821                 return copy_to_user(optval, &pvc, sizeof(pvc)) ? -EFAULT : 0;
822         }
823         default:
824                 return -EINVAL;
825         }
826 }
827 
828 int register_atmdevice_notifier(struct notifier_block *nb)
829 {
830         return atomic_notifier_chain_register(&atm_dev_notify_chain, nb);
831 }
832 EXPORT_SYMBOL_GPL(register_atmdevice_notifier);
833 
834 void unregister_atmdevice_notifier(struct notifier_block *nb)
835 {
836         atomic_notifier_chain_unregister(&atm_dev_notify_chain, nb);
837 }
838 EXPORT_SYMBOL_GPL(unregister_atmdevice_notifier);
839 
840 static int __init atm_init(void)
841 {
842         int error;
843 
844         error = proto_register(&vcc_proto, 0);
845         if (error < 0)
846                 goto out;
847         error = atmpvc_init();
848         if (error < 0) {
849                 pr_err("atmpvc_init() failed with %d\n", error);
850                 goto out_unregister_vcc_proto;
851         }
852         error = atmsvc_init();
853         if (error < 0) {
854                 pr_err("atmsvc_init() failed with %d\n", error);
855                 goto out_atmpvc_exit;
856         }
857         error = atm_proc_init();
858         if (error < 0) {
859                 pr_err("atm_proc_init() failed with %d\n", error);
860                 goto out_atmsvc_exit;
861         }
862         error = atm_sysfs_init();
863         if (error < 0) {
864                 pr_err("atm_sysfs_init() failed with %d\n", error);
865                 goto out_atmproc_exit;
866         }
867 out:
868         return error;
869 out_atmproc_exit:
870         atm_proc_exit();
871 out_atmsvc_exit:
872         atmsvc_exit();
873 out_atmpvc_exit:
874         atmsvc_exit();
875 out_unregister_vcc_proto:
876         proto_unregister(&vcc_proto);
877         goto out;
878 }
879 
880 static void __exit atm_exit(void)
881 {
882         atm_proc_exit();
883         atm_sysfs_exit();
884         atmsvc_exit();
885         atmpvc_exit();
886         proto_unregister(&vcc_proto);
887 }
888 
889 subsys_initcall(atm_init);
890 
891 module_exit(atm_exit);
892 
893 MODULE_LICENSE("GPL");
894 MODULE_ALIAS_NETPROTO(PF_ATMPVC);
895 MODULE_ALIAS_NETPROTO(PF_ATMSVC);
896 

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