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cfg80211: avoid mem leak on driver hint set
[linux/fpc-iii.git] / net / atm / common.c
blob7b491006eaf4000424282979b0c4709325102152
1 /* net/atm/common.c - ATM sockets (common part for PVC and SVC) */
2
3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
4
5 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
6
7 #include <linux/module.h>
8 #include <linux/kmod.h>
9 #include <linux/net.h> /* struct socket, struct proto_ops */
10 #include <linux/atm.h> /* ATM stuff */
11 #include <linux/atmdev.h>
12 #include <linux/socket.h> /* SOL_SOCKET */
13 #include <linux/errno.h> /* error codes */
14 #include <linux/capability.h>
15 #include <linux/mm.h>
16 #include <linux/sched.h>
17 #include <linux/time.h> /* struct timeval */
18 #include <linux/skbuff.h>
19 #include <linux/bitops.h>
20 #include <linux/init.h>
21 #include <linux/slab.h>
22 #include <net/sock.h> /* struct sock */
23 #include <linux/uaccess.h>
24 #include <linux/poll.h>
25
26 #include <linux/atomic.h>
27
28 #include "resources.h" /* atm_find_dev */
29 #include "common.h" /* prototypes */
30 #include "protocols.h" /* atm_init_<transport> */
31 #include "addr.h" /* address registry */
32 #include "signaling.h" /* for WAITING and sigd_attach */
33
34 struct hlist_head vcc_hash[VCC_HTABLE_SIZE];
35 EXPORT_SYMBOL(vcc_hash);
36
37 DEFINE_RWLOCK(vcc_sklist_lock);
38 EXPORT_SYMBOL(vcc_sklist_lock);
39
40 static ATOMIC_NOTIFIER_HEAD(atm_dev_notify_chain);
41
42 static void __vcc_insert_socket(struct sock *sk)
43 {
44 struct atm_vcc *vcc = atm_sk(sk);
45 struct hlist_head *head = &vcc_hash[vcc->vci & (VCC_HTABLE_SIZE - 1)];
46 sk->sk_hash = vcc->vci & (VCC_HTABLE_SIZE - 1);
47 sk_add_node(sk, head);
48 }
49
50 void vcc_insert_socket(struct sock *sk)
51 {
52 write_lock_irq(&vcc_sklist_lock);
53 __vcc_insert_socket(sk);
54 write_unlock_irq(&vcc_sklist_lock);
55 }
56 EXPORT_SYMBOL(vcc_insert_socket);
57
58 static void vcc_remove_socket(struct sock *sk)
59 {
60 write_lock_irq(&vcc_sklist_lock);
61 sk_del_node_init(sk);
62 write_unlock_irq(&vcc_sklist_lock);
63 }
64
65 static struct sk_buff *alloc_tx(struct atm_vcc *vcc, unsigned int size)
66 {
67 struct sk_buff *skb;
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 NULL;
74 }
75 while (!(skb = alloc_skb(size, GFP_KERNEL)))
76 schedule();
77 pr_debug("%d += %d\n", sk_wmem_alloc_get(sk), skb->truesize);
78 atomic_add(skb->truesize, &sk->sk_wmem_alloc);
79 return skb;
80 }
81
82 static void vcc_sock_destruct(struct sock *sk)
83 {
84 if (atomic_read(&sk->sk_rmem_alloc))
85 printk(KERN_DEBUG "%s: rmem leakage (%d bytes) detected.\n",
86 __func__, atomic_read(&sk->sk_rmem_alloc));
87
88 if (atomic_read(&sk->sk_wmem_alloc))
89 printk(KERN_DEBUG "%s: wmem leakage (%d bytes) detected.\n",
90 __func__, atomic_read(&sk->sk_wmem_alloc));
91 }
92
93 static void vcc_def_wakeup(struct sock *sk)
94 {
95 struct socket_wq *wq;
96
97 rcu_read_lock();
98 wq = rcu_dereference(sk->sk_wq);
99 if (wq_has_sleeper(wq))
100 wake_up(&wq->wait);
101 rcu_read_unlock();
102 }
103
104 static inline int vcc_writable(struct sock *sk)
105 {
106 struct atm_vcc *vcc = atm_sk(sk);
107
108 return (vcc->qos.txtp.max_sdu +
109 atomic_read(&sk->sk_wmem_alloc)) <= sk->sk_sndbuf;
110 }
111
112 static void vcc_write_space(struct sock *sk)
113 {
114 struct socket_wq *wq;
115
116 rcu_read_lock();
117
118 if (vcc_writable(sk)) {
119 wq = rcu_dereference(sk->sk_wq);
120 if (wq_has_sleeper(wq))
121 wake_up_interruptible(&wq->wait);
122
123 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
124 }
125
126 rcu_read_unlock();
127 }
128
129 static void vcc_release_cb(struct sock *sk)
130 {
131 struct atm_vcc *vcc = atm_sk(sk);
132
133 if (vcc->release_cb)
134 vcc->release_cb(vcc);
135 }
136
137 static struct proto vcc_proto = {
138 .name = "VCC",
139 .owner = THIS_MODULE,
140 .obj_size = sizeof(struct atm_vcc),
141 .release_cb = vcc_release_cb,
142 };
143
144 int vcc_create(struct net *net, struct socket *sock, int protocol, int family)
145 {
146 struct sock *sk;
147 struct atm_vcc *vcc;
148
149 sock->sk = NULL;
150 if (sock->type == SOCK_STREAM)
151 return -EINVAL;
152 sk = sk_alloc(net, family, GFP_KERNEL, &vcc_proto);
153 if (!sk)
154 return -ENOMEM;
155 sock_init_data(sock, sk);
156 sk->sk_state_change = vcc_def_wakeup;
157 sk->sk_write_space = vcc_write_space;
158
159 vcc = atm_sk(sk);
160 vcc->dev = NULL;
161 memset(&vcc->local, 0, sizeof(struct sockaddr_atmsvc));
162 memset(&vcc->remote, 0, sizeof(struct sockaddr_atmsvc));
163 vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */
164 atomic_set(&sk->sk_wmem_alloc, 1);
165 atomic_set(&sk->sk_rmem_alloc, 0);
166 vcc->push = NULL;
167 vcc->pop = NULL;
168 vcc->owner = NULL;
169 vcc->push_oam = NULL;
170 vcc->release_cb = NULL;
171 vcc->vpi = vcc->vci = 0; /* no VCI/VPI yet */
172 vcc->atm_options = vcc->aal_options = 0;
173 sk->sk_destruct = vcc_sock_destruct;
174 return 0;
175 }
176
177 static void vcc_destroy_socket(struct sock *sk)
178 {
179 struct atm_vcc *vcc = atm_sk(sk);
180 struct sk_buff *skb;
181
182 set_bit(ATM_VF_CLOSE, &vcc->flags);
183 clear_bit(ATM_VF_READY, &vcc->flags);
184 if (vcc->dev) {
185 if (vcc->dev->ops->close)
186 vcc->dev->ops->close(vcc);
187 if (vcc->push)
188 vcc->push(vcc, NULL); /* atmarpd has no push */
189 module_put(vcc->owner);
190
191 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
192 atm_return(vcc, skb->truesize);
193 kfree_skb(skb);
194 }
195
196 module_put(vcc->dev->ops->owner);
197 atm_dev_put(vcc->dev);
198 }
199
200 vcc_remove_socket(sk);
201 }
202
203 int vcc_release(struct socket *sock)
204 {
205 struct sock *sk = sock->sk;
206
207 if (sk) {
208 lock_sock(sk);
209 vcc_destroy_socket(sock->sk);
210 release_sock(sk);
211 sock_put(sk);
212 }
213
214 return 0;
215 }
216
217 void vcc_release_async(struct atm_vcc *vcc, int reply)
218 {
219 struct sock *sk = sk_atm(vcc);
220
221 set_bit(ATM_VF_CLOSE, &vcc->flags);
222 sk->sk_shutdown |= RCV_SHUTDOWN;
223 sk->sk_err = -reply;
224 clear_bit(ATM_VF_WAITING, &vcc->flags);
225 sk->sk_state_change(sk);
226 }
227 EXPORT_SYMBOL(vcc_release_async);
228
229 void vcc_process_recv_queue(struct atm_vcc *vcc)
230 {
231 struct sk_buff_head queue, *rq;
232 struct sk_buff *skb, *tmp;
233 unsigned long flags;
234
235 __skb_queue_head_init(&queue);
236 rq = &sk_atm(vcc)->sk_receive_queue;
237
238 spin_lock_irqsave(&rq->lock, flags);
239 skb_queue_splice_init(rq, &queue);
240 spin_unlock_irqrestore(&rq->lock, flags);
241
242 skb_queue_walk_safe(&queue, skb, tmp) {
243 __skb_unlink(skb, &queue);
244 vcc->push(vcc, skb);
245 }
246 }
247 EXPORT_SYMBOL(vcc_process_recv_queue);
248
249 void atm_dev_signal_change(struct atm_dev *dev, char signal)
250 {
251 pr_debug("%s signal=%d dev=%p number=%d dev->signal=%d\n",
252 __func__, signal, dev, dev->number, dev->signal);
253
254 /* atm driver sending invalid signal */
255 WARN_ON(signal < ATM_PHY_SIG_LOST || signal > ATM_PHY_SIG_FOUND);
256
257 if (dev->signal == signal)
258 return; /* no change */
259
260 dev->signal = signal;
261
262 atomic_notifier_call_chain(&atm_dev_notify_chain, signal, dev);
263 }
264 EXPORT_SYMBOL(atm_dev_signal_change);
265
266 void atm_dev_release_vccs(struct atm_dev *dev)
267 {
268 int i;
269
270 write_lock_irq(&vcc_sklist_lock);
271 for (i = 0; i < VCC_HTABLE_SIZE; i++) {
272 struct hlist_head *head = &vcc_hash[i];
273 struct hlist_node *tmp;
274 struct sock *s;
275 struct atm_vcc *vcc;
276
277 sk_for_each_safe(s, tmp, head) {
278 vcc = atm_sk(s);
279 if (vcc->dev == dev) {
280 vcc_release_async(vcc, -EPIPE);
281 sk_del_node_init(s);
282 }
283 }
284 }
285 write_unlock_irq(&vcc_sklist_lock);
286 }
287 EXPORT_SYMBOL(atm_dev_release_vccs);
288
289 static int adjust_tp(struct atm_trafprm *tp, unsigned char aal)
290 {
291 int max_sdu;
292
293 if (!tp->traffic_class)
294 return 0;
295 switch (aal) {
296 case ATM_AAL0:
297 max_sdu = ATM_CELL_SIZE-1;
298 break;
299 case ATM_AAL34:
300 max_sdu = ATM_MAX_AAL34_PDU;
301 break;
302 default:
303 pr_warning("AAL problems ... (%d)\n", aal);
304 /* fall through */
305 case ATM_AAL5:
306 max_sdu = ATM_MAX_AAL5_PDU;
307 }
308 if (!tp->max_sdu)
309 tp->max_sdu = max_sdu;
310 else if (tp->max_sdu > max_sdu)
311 return -EINVAL;
312 if (!tp->max_cdv)
313 tp->max_cdv = ATM_MAX_CDV;
314 return 0;
315 }
316
317 static int check_ci(const struct atm_vcc *vcc, short vpi, int vci)
318 {
319 struct hlist_head *head = &vcc_hash[vci & (VCC_HTABLE_SIZE - 1)];
320 struct sock *s;
321 struct atm_vcc *walk;
322
323 sk_for_each(s, head) {
324 walk = atm_sk(s);
325 if (walk->dev != vcc->dev)
326 continue;
327 if (test_bit(ATM_VF_ADDR, &walk->flags) && walk->vpi == vpi &&
328 walk->vci == vci && ((walk->qos.txtp.traffic_class !=
329 ATM_NONE && vcc->qos.txtp.traffic_class != ATM_NONE) ||
330 (walk->qos.rxtp.traffic_class != ATM_NONE &&
331 vcc->qos.rxtp.traffic_class != ATM_NONE)))
332 return -EADDRINUSE;
333 }
334
335 /* allow VCCs with same VPI/VCI iff they don't collide on
336 TX/RX (but we may refuse such sharing for other reasons,
337 e.g. if protocol requires to have both channels) */
338
339 return 0;
340 }
341
342 static int find_ci(const struct atm_vcc *vcc, short *vpi, int *vci)
343 {
344 static short p; /* poor man's per-device cache */
345 static int c;
346 short old_p;
347 int old_c;
348 int err;
349
350 if (*vpi != ATM_VPI_ANY && *vci != ATM_VCI_ANY) {
351 err = check_ci(vcc, *vpi, *vci);
352 return err;
353 }
354 /* last scan may have left values out of bounds for current device */
355 if (*vpi != ATM_VPI_ANY)
356 p = *vpi;
357 else if (p >= 1 << vcc->dev->ci_range.vpi_bits)
358 p = 0;
359 if (*vci != ATM_VCI_ANY)
360 c = *vci;
361 else if (c < ATM_NOT_RSV_VCI || c >= 1 << vcc->dev->ci_range.vci_bits)
362 c = ATM_NOT_RSV_VCI;
363 old_p = p;
364 old_c = c;
365 do {
366 if (!check_ci(vcc, p, c)) {
367 *vpi = p;
368 *vci = c;
369 return 0;
370 }
371 if (*vci == ATM_VCI_ANY) {
372 c++;
373 if (c >= 1 << vcc->dev->ci_range.vci_bits)
374 c = ATM_NOT_RSV_VCI;
375 }
376 if ((c == ATM_NOT_RSV_VCI || *vci != ATM_VCI_ANY) &&
377 *vpi == ATM_VPI_ANY) {
378 p++;
379 if (p >= 1 << vcc->dev->ci_range.vpi_bits)
380 p = 0;
381 }
382 } while (old_p != p || old_c != c);
383 return -EADDRINUSE;
384 }
385
386 static int __vcc_connect(struct atm_vcc *vcc, struct atm_dev *dev, short vpi,
387 int vci)
388 {
389 struct sock *sk = sk_atm(vcc);
390 int error;
391
392 if ((vpi != ATM_VPI_UNSPEC && vpi != ATM_VPI_ANY &&
393 vpi >> dev->ci_range.vpi_bits) || (vci != ATM_VCI_UNSPEC &&
394 vci != ATM_VCI_ANY && vci >> dev->ci_range.vci_bits))
395 return -EINVAL;
396 if (vci > 0 && vci < ATM_NOT_RSV_VCI && !capable(CAP_NET_BIND_SERVICE))
397 return -EPERM;
398 error = -ENODEV;
399 if (!try_module_get(dev->ops->owner))
400 return error;
401 vcc->dev = dev;
402 write_lock_irq(&vcc_sklist_lock);
403 if (test_bit(ATM_DF_REMOVED, &dev->flags) ||
404 (error = find_ci(vcc, &vpi, &vci))) {
405 write_unlock_irq(&vcc_sklist_lock);
406 goto fail_module_put;
407 }
408 vcc->vpi = vpi;
409 vcc->vci = vci;
410 __vcc_insert_socket(sk);
411 write_unlock_irq(&vcc_sklist_lock);
412 switch (vcc->qos.aal) {
413 case ATM_AAL0:
414 error = atm_init_aal0(vcc);
415 vcc->stats = &dev->stats.aal0;
416 break;
417 case ATM_AAL34:
418 error = atm_init_aal34(vcc);
419 vcc->stats = &dev->stats.aal34;
420 break;
421 case ATM_NO_AAL:
422 /* ATM_AAL5 is also used in the "0 for default" case */
423 vcc->qos.aal = ATM_AAL5;
424 /* fall through */
425 case ATM_AAL5:
426 error = atm_init_aal5(vcc);
427 vcc->stats = &dev->stats.aal5;
428 break;
429 default:
430 error = -EPROTOTYPE;
431 }
432 if (!error)
433 error = adjust_tp(&vcc->qos.txtp, vcc->qos.aal);
434 if (!error)
435 error = adjust_tp(&vcc->qos.rxtp, vcc->qos.aal);
436 if (error)
437 goto fail;
438 pr_debug("VCC %d.%d, AAL %d\n", vpi, vci, vcc->qos.aal);
439 pr_debug(" TX: %d, PCR %d..%d, SDU %d\n",
440 vcc->qos.txtp.traffic_class,
441 vcc->qos.txtp.min_pcr,
442 vcc->qos.txtp.max_pcr,
443 vcc->qos.txtp.max_sdu);
444 pr_debug(" RX: %d, PCR %d..%d, SDU %d\n",
445 vcc->qos.rxtp.traffic_class,
446 vcc->qos.rxtp.min_pcr,
447 vcc->qos.rxtp.max_pcr,
448 vcc->qos.rxtp.max_sdu);
449
450 if (dev->ops->open) {
451 error = dev->ops->open(vcc);
452 if (error)
453 goto fail;
454 }
455 return 0;
456
457 fail:
458 vcc_remove_socket(sk);
459 fail_module_put:
460 module_put(dev->ops->owner);
461 /* ensure we get dev module ref count correct */
462 vcc->dev = NULL;
463 return error;
464 }
465
466 int vcc_connect(struct socket *sock, int itf, short vpi, int vci)
467 {
468 struct atm_dev *dev;
469 struct atm_vcc *vcc = ATM_SD(sock);
470 int error;
471
472 pr_debug("(vpi %d, vci %d)\n", vpi, vci);
473 if (sock->state == SS_CONNECTED)
474 return -EISCONN;
475 if (sock->state != SS_UNCONNECTED)
476 return -EINVAL;
477 if (!(vpi || vci))
478 return -EINVAL;
479
480 if (vpi != ATM_VPI_UNSPEC && vci != ATM_VCI_UNSPEC)
481 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
482 else
483 if (test_bit(ATM_VF_PARTIAL, &vcc->flags))
484 return -EINVAL;
485 pr_debug("(TX: cl %d,bw %d-%d,sdu %d; "
486 "RX: cl %d,bw %d-%d,sdu %d,AAL %s%d)\n",
487 vcc->qos.txtp.traffic_class, vcc->qos.txtp.min_pcr,
488 vcc->qos.txtp.max_pcr, vcc->qos.txtp.max_sdu,
489 vcc->qos.rxtp.traffic_class, vcc->qos.rxtp.min_pcr,
490 vcc->qos.rxtp.max_pcr, vcc->qos.rxtp.max_sdu,
491 vcc->qos.aal == ATM_AAL5 ? "" :
492 vcc->qos.aal == ATM_AAL0 ? "" : " ??? code ",
493 vcc->qos.aal == ATM_AAL0 ? 0 : vcc->qos.aal);
494 if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
495 return -EBADFD;
496 if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
497 vcc->qos.rxtp.traffic_class == ATM_ANYCLASS)
498 return -EINVAL;
499 if (likely(itf != ATM_ITF_ANY)) {
500 dev = try_then_request_module(atm_dev_lookup(itf),
501 "atm-device-%d", itf);
502 } else {
503 dev = NULL;
504 mutex_lock(&atm_dev_mutex);
505 if (!list_empty(&atm_devs)) {
506 dev = list_entry(atm_devs.next,
507 struct atm_dev, dev_list);
508 atm_dev_hold(dev);
509 }
510 mutex_unlock(&atm_dev_mutex);
511 }
512 if (!dev)
513 return -ENODEV;
514 error = __vcc_connect(vcc, dev, vpi, vci);
515 if (error) {
516 atm_dev_put(dev);
517 return error;
518 }
519 if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC)
520 set_bit(ATM_VF_PARTIAL, &vcc->flags);
521 if (test_bit(ATM_VF_READY, &ATM_SD(sock)->flags))
522 sock->state = SS_CONNECTED;
523 return 0;
524 }
525
526 int vcc_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
527 size_t size, int flags)
528 {
529 struct sock *sk = sock->sk;
530 struct atm_vcc *vcc;
531 struct sk_buff *skb;
532 int copied, error = -EINVAL;
533
534 if (sock->state != SS_CONNECTED)
535 return -ENOTCONN;
536
537 /* only handle MSG_DONTWAIT and MSG_PEEK */
538 if (flags & ~(MSG_DONTWAIT | MSG_PEEK))
539 return -EOPNOTSUPP;
540
541 vcc = ATM_SD(sock);
542 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
543 test_bit(ATM_VF_CLOSE, &vcc->flags) ||
544 !test_bit(ATM_VF_READY, &vcc->flags))
545 return 0;
546
547 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &error);
548 if (!skb)
549 return error;
550
551 copied = skb->len;
552 if (copied > size) {
553 copied = size;
554 msg->msg_flags |= MSG_TRUNC;
555 }
556
557 error = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
558 if (error)
559 return error;
560 sock_recv_ts_and_drops(msg, sk, skb);
561
562 if (!(flags & MSG_PEEK)) {
563 pr_debug("%d -= %d\n", atomic_read(&sk->sk_rmem_alloc),
564 skb->truesize);
565 atm_return(vcc, skb->truesize);
566 }
567
568 skb_free_datagram(sk, skb);
569 return copied;
570 }
571
572 int vcc_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
573 size_t total_len)
574 {
575 struct sock *sk = sock->sk;
576 DEFINE_WAIT(wait);
577 struct atm_vcc *vcc;
578 struct sk_buff *skb;
579 int eff, error;
580 const void __user *buff;
581 int size;
582
583 lock_sock(sk);
584 if (sock->state != SS_CONNECTED) {
585 error = -ENOTCONN;
586 goto out;
587 }
588 if (m->msg_name) {
589 error = -EISCONN;
590 goto out;
591 }
592 if (m->msg_iovlen != 1) {
593 error = -ENOSYS; /* fix this later @@@ */
594 goto out;
595 }
596 buff = m->msg_iov->iov_base;
597 size = m->msg_iov->iov_len;
598 vcc = ATM_SD(sock);
599 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
600 test_bit(ATM_VF_CLOSE, &vcc->flags) ||
601 !test_bit(ATM_VF_READY, &vcc->flags)) {
602 error = -EPIPE;
603 send_sig(SIGPIPE, current, 0);
604 goto out;
605 }
606 if (!size) {
607 error = 0;
608 goto out;
609 }
610 if (size < 0 || size > vcc->qos.txtp.max_sdu) {
611 error = -EMSGSIZE;
612 goto out;
613 }
614
615 eff = (size+3) & ~3; /* align to word boundary */
616 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
617 error = 0;
618 while (!(skb = alloc_tx(vcc, eff))) {
619 if (m->msg_flags & MSG_DONTWAIT) {
620 error = -EAGAIN;
621 break;
622 }
623 schedule();
624 if (signal_pending(current)) {
625 error = -ERESTARTSYS;
626 break;
627 }
628 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
629 test_bit(ATM_VF_CLOSE, &vcc->flags) ||
630 !test_bit(ATM_VF_READY, &vcc->flags)) {
631 error = -EPIPE;
632 send_sig(SIGPIPE, current, 0);
633 break;
634 }
635 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
636 }
637 finish_wait(sk_sleep(sk), &wait);
638 if (error)
639 goto out;
640 skb->dev = NULL; /* for paths shared with net_device interfaces */
641 ATM_SKB(skb)->atm_options = vcc->atm_options;
642 if (copy_from_user(skb_put(skb, size), buff, size)) {
643 kfree_skb(skb);
644 error = -EFAULT;
645 goto out;
646 }
647 if (eff != size)
648 memset(skb->data + size, 0, eff-size);
649 error = vcc->dev->ops->send(vcc, skb);
650 error = error ? error : size;
651 out:
652 release_sock(sk);
653 return error;
654 }
655
656 unsigned int vcc_poll(struct file *file, struct socket *sock, poll_table *wait)
657 {
658 struct sock *sk = sock->sk;
659 struct atm_vcc *vcc;
660 unsigned int mask;
661
662 sock_poll_wait(file, sk_sleep(sk), wait);
663 mask = 0;
664
665 vcc = ATM_SD(sock);
666
667 /* exceptional events */
668 if (sk->sk_err)
669 mask = POLLERR;
670
671 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
672 test_bit(ATM_VF_CLOSE, &vcc->flags))
673 mask |= POLLHUP;
674
675 /* readable? */
676 if (!skb_queue_empty(&sk->sk_receive_queue))
677 mask |= POLLIN | POLLRDNORM;
678
679 /* writable? */
680 if (sock->state == SS_CONNECTING &&
681 test_bit(ATM_VF_WAITING, &vcc->flags))
682 return mask;
683
684 if (vcc->qos.txtp.traffic_class != ATM_NONE &&
685 vcc_writable(sk))
686 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
687
688 return mask;
689 }
690
691 static int atm_change_qos(struct atm_vcc *vcc, struct atm_qos *qos)
692 {
693 int error;
694
695 /*
696 * Don't let the QoS change the already connected AAL type nor the
697 * traffic class.
698 */
699 if (qos->aal != vcc->qos.aal ||
700 qos->rxtp.traffic_class != vcc->qos.rxtp.traffic_class ||
701 qos->txtp.traffic_class != vcc->qos.txtp.traffic_class)
702 return -EINVAL;
703 error = adjust_tp(&qos->txtp, qos->aal);
704 if (!error)
705 error = adjust_tp(&qos->rxtp, qos->aal);
706 if (error)
707 return error;
708 if (!vcc->dev->ops->change_qos)
709 return -EOPNOTSUPP;
710 if (sk_atm(vcc)->sk_family == AF_ATMPVC)
711 return vcc->dev->ops->change_qos(vcc, qos, ATM_MF_SET);
712 return svc_change_qos(vcc, qos);
713 }
714
715 static int check_tp(const struct atm_trafprm *tp)
716 {
717 /* @@@ Should be merged with adjust_tp */
718 if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS)
719 return 0;
720 if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr &&
721 !tp->max_pcr)
722 return -EINVAL;
723 if (tp->min_pcr == ATM_MAX_PCR)
724 return -EINVAL;
725 if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR &&
726 tp->min_pcr > tp->max_pcr)
727 return -EINVAL;
728 /*
729 * We allow pcr to be outside [min_pcr,max_pcr], because later
730 * adjustment may still push it in the valid range.
731 */
732 return 0;
733 }
734
735 static int check_qos(const struct atm_qos *qos)
736 {
737 int error;
738
739 if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class)
740 return -EINVAL;
741 if (qos->txtp.traffic_class != qos->rxtp.traffic_class &&
742 qos->txtp.traffic_class && qos->rxtp.traffic_class &&
743 qos->txtp.traffic_class != ATM_ANYCLASS &&
744 qos->rxtp.traffic_class != ATM_ANYCLASS)
745 return -EINVAL;
746 error = check_tp(&qos->txtp);
747 if (error)
748 return error;
749 return check_tp(&qos->rxtp);
750 }
751
752 int vcc_setsockopt(struct socket *sock, int level, int optname,
753 char __user *optval, unsigned int optlen)
754 {
755 struct atm_vcc *vcc;
756 unsigned long value;
757 int error;
758
759 if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname))
760 return -EINVAL;
761
762 vcc = ATM_SD(sock);
763 switch (optname) {
764 case SO_ATMQOS:
765 {
766 struct atm_qos qos;
767
768 if (copy_from_user(&qos, optval, sizeof(qos)))
769 return -EFAULT;
770 error = check_qos(&qos);
771 if (error)
772 return error;
773 if (sock->state == SS_CONNECTED)
774 return atm_change_qos(vcc, &qos);
775 if (sock->state != SS_UNCONNECTED)
776 return -EBADFD;
777 vcc->qos = qos;
778 set_bit(ATM_VF_HASQOS, &vcc->flags);
779 return 0;
780 }
781 case SO_SETCLP:
782 if (get_user(value, (unsigned long __user *)optval))
783 return -EFAULT;
784 if (value)
785 vcc->atm_options |= ATM_ATMOPT_CLP;
786 else
787 vcc->atm_options &= ~ATM_ATMOPT_CLP;
788 return 0;
789 default:
790 if (level == SOL_SOCKET)
791 return -EINVAL;
792 break;
793 }
794 if (!vcc->dev || !vcc->dev->ops->setsockopt)
795 return -EINVAL;
796 return vcc->dev->ops->setsockopt(vcc, level, optname, optval, optlen);
797 }
798
799 int vcc_getsockopt(struct socket *sock, int level, int optname,
800 char __user *optval, int __user *optlen)
801 {
802 struct atm_vcc *vcc;
803 int len;
804
805 if (get_user(len, optlen))
806 return -EFAULT;
807 if (__SO_LEVEL_MATCH(optname, level) && len != __SO_SIZE(optname))
808 return -EINVAL;
809
810 vcc = ATM_SD(sock);
811 switch (optname) {
812 case SO_ATMQOS:
813 if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
814 return -EINVAL;
815 return copy_to_user(optval, &vcc->qos, sizeof(vcc->qos))
816 ? -EFAULT : 0;
817 case SO_SETCLP:
818 return put_user(vcc->atm_options & ATM_ATMOPT_CLP ? 1 : 0,
819 (unsigned long __user *)optval) ? -EFAULT : 0;
820 case SO_ATMPVC:
821 {
822 struct sockaddr_atmpvc pvc;
823
824 if (!vcc->dev || !test_bit(ATM_VF_ADDR, &vcc->flags))
825 return -ENOTCONN;
826 memset(&pvc, 0, sizeof(pvc));
827 pvc.sap_family = AF_ATMPVC;
828 pvc.sap_addr.itf = vcc->dev->number;
829 pvc.sap_addr.vpi = vcc->vpi;
830 pvc.sap_addr.vci = vcc->vci;
831 return copy_to_user(optval, &pvc, sizeof(pvc)) ? -EFAULT : 0;
832 }
833 default:
834 if (level == SOL_SOCKET)
835 return -EINVAL;
836 break;
837 }
838 if (!vcc->dev || !vcc->dev->ops->getsockopt)
839 return -EINVAL;
840 return vcc->dev->ops->getsockopt(vcc, level, optname, optval, len);
841 }
842
843 int register_atmdevice_notifier(struct notifier_block *nb)
844 {
845 return atomic_notifier_chain_register(&atm_dev_notify_chain, nb);
846 }
847 EXPORT_SYMBOL_GPL(register_atmdevice_notifier);
848
849 void unregister_atmdevice_notifier(struct notifier_block *nb)
850 {
851 atomic_notifier_chain_unregister(&atm_dev_notify_chain, nb);
852 }
853 EXPORT_SYMBOL_GPL(unregister_atmdevice_notifier);
854
855 static int __init atm_init(void)
856 {
857 int error;
858
859 error = proto_register(&vcc_proto, 0);
860 if (error < 0)
861 goto out;
862 error = atmpvc_init();
863 if (error < 0) {
864 pr_err("atmpvc_init() failed with %d\n", error);
865 goto out_unregister_vcc_proto;
866 }
867 error = atmsvc_init();
868 if (error < 0) {
869 pr_err("atmsvc_init() failed with %d\n", error);
870 goto out_atmpvc_exit;
871 }
872 error = atm_proc_init();
873 if (error < 0) {
874 pr_err("atm_proc_init() failed with %d\n", error);
875 goto out_atmsvc_exit;
876 }
877 error = atm_sysfs_init();
878 if (error < 0) {
879 pr_err("atm_sysfs_init() failed with %d\n", error);
880 goto out_atmproc_exit;
881 }
882 out:
883 return error;
884 out_atmproc_exit:
885 atm_proc_exit();
886 out_atmsvc_exit:
887 atmsvc_exit();
888 out_atmpvc_exit:
889 atmsvc_exit();
890 out_unregister_vcc_proto:
891 proto_unregister(&vcc_proto);
892 goto out;
893 }
894
895 static void __exit atm_exit(void)
896 {
897 atm_proc_exit();
898 atm_sysfs_exit();
899 atmsvc_exit();
900 atmpvc_exit();
901 proto_unregister(&vcc_proto);
902 }
903
904 subsys_initcall(atm_init);
905
906 module_exit(atm_exit);
907
908 MODULE_LICENSE("GPL");
909 MODULE_ALIAS_NETPROTO(PF_ATMPVC);
910 MODULE_ALIAS_NETPROTO(PF_ATMSVC);
Linux with added FPC-III support