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Staging: hv: remove OnChildDeviceRemove vmbus_driver callback
[zen-stable.git] / net / atm / common.c
blob1b9c52a02cd31995c63040377d4e24443bad85a3
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 <asm/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 struct proto vcc_proto = {
130 .name = "VCC",
131 .owner = THIS_MODULE,
132 .obj_size = sizeof(struct atm_vcc),
133 };
134
135 int vcc_create(struct net *net, struct socket *sock, int protocol, int family)
136 {
137 struct sock *sk;
138 struct atm_vcc *vcc;
139
140 sock->sk = NULL;
141 if (sock->type == SOCK_STREAM)
142 return -EINVAL;
143 sk = sk_alloc(net, family, GFP_KERNEL, &vcc_proto);
144 if (!sk)
145 return -ENOMEM;
146 sock_init_data(sock, sk);
147 sk->sk_state_change = vcc_def_wakeup;
148 sk->sk_write_space = vcc_write_space;
149
150 vcc = atm_sk(sk);
151 vcc->dev = NULL;
152 memset(&vcc->local, 0, sizeof(struct sockaddr_atmsvc));
153 memset(&vcc->remote, 0, sizeof(struct sockaddr_atmsvc));
154 vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */
155 atomic_set(&sk->sk_wmem_alloc, 1);
156 atomic_set(&sk->sk_rmem_alloc, 0);
157 vcc->push = NULL;
158 vcc->pop = NULL;
159 vcc->push_oam = NULL;
160 vcc->vpi = vcc->vci = 0; /* no VCI/VPI yet */
161 vcc->atm_options = vcc->aal_options = 0;
162 sk->sk_destruct = vcc_sock_destruct;
163 return 0;
164 }
165
166 static void vcc_destroy_socket(struct sock *sk)
167 {
168 struct atm_vcc *vcc = atm_sk(sk);
169 struct sk_buff *skb;
170
171 set_bit(ATM_VF_CLOSE, &vcc->flags);
172 clear_bit(ATM_VF_READY, &vcc->flags);
173 if (vcc->dev) {
174 if (vcc->dev->ops->close)
175 vcc->dev->ops->close(vcc);
176 if (vcc->push)
177 vcc->push(vcc, NULL); /* atmarpd has no push */
178
179 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
180 atm_return(vcc, skb->truesize);
181 kfree_skb(skb);
182 }
183
184 module_put(vcc->dev->ops->owner);
185 atm_dev_put(vcc->dev);
186 }
187
188 vcc_remove_socket(sk);
189 }
190
191 int vcc_release(struct socket *sock)
192 {
193 struct sock *sk = sock->sk;
194
195 if (sk) {
196 lock_sock(sk);
197 vcc_destroy_socket(sock->sk);
198 release_sock(sk);
199 sock_put(sk);
200 }
201
202 return 0;
203 }
204
205 void vcc_release_async(struct atm_vcc *vcc, int reply)
206 {
207 struct sock *sk = sk_atm(vcc);
208
209 set_bit(ATM_VF_CLOSE, &vcc->flags);
210 sk->sk_shutdown |= RCV_SHUTDOWN;
211 sk->sk_err = -reply;
212 clear_bit(ATM_VF_WAITING, &vcc->flags);
213 sk->sk_state_change(sk);
214 }
215 EXPORT_SYMBOL(vcc_release_async);
216
217 void atm_dev_signal_change(struct atm_dev *dev, char signal)
218 {
219 pr_debug("%s signal=%d dev=%p number=%d dev->signal=%d\n",
220 __func__, signal, dev, dev->number, dev->signal);
221
222 /* atm driver sending invalid signal */
223 WARN_ON(signal < ATM_PHY_SIG_LOST || signal > ATM_PHY_SIG_FOUND);
224
225 if (dev->signal == signal)
226 return; /* no change */
227
228 dev->signal = signal;
229
230 atomic_notifier_call_chain(&atm_dev_notify_chain, signal, dev);
231 }
232 EXPORT_SYMBOL(atm_dev_signal_change);
233
234 void atm_dev_release_vccs(struct atm_dev *dev)
235 {
236 int i;
237
238 write_lock_irq(&vcc_sklist_lock);
239 for (i = 0; i < VCC_HTABLE_SIZE; i++) {
240 struct hlist_head *head = &vcc_hash[i];
241 struct hlist_node *node, *tmp;
242 struct sock *s;
243 struct atm_vcc *vcc;
244
245 sk_for_each_safe(s, node, tmp, head) {
246 vcc = atm_sk(s);
247 if (vcc->dev == dev) {
248 vcc_release_async(vcc, -EPIPE);
249 sk_del_node_init(s);
250 }
251 }
252 }
253 write_unlock_irq(&vcc_sklist_lock);
254 }
255
256 static int adjust_tp(struct atm_trafprm *tp, unsigned char aal)
257 {
258 int max_sdu;
259
260 if (!tp->traffic_class)
261 return 0;
262 switch (aal) {
263 case ATM_AAL0:
264 max_sdu = ATM_CELL_SIZE-1;
265 break;
266 case ATM_AAL34:
267 max_sdu = ATM_MAX_AAL34_PDU;
268 break;
269 default:
270 pr_warning("AAL problems ... (%d)\n", aal);
271 /* fall through */
272 case ATM_AAL5:
273 max_sdu = ATM_MAX_AAL5_PDU;
274 }
275 if (!tp->max_sdu)
276 tp->max_sdu = max_sdu;
277 else if (tp->max_sdu > max_sdu)
278 return -EINVAL;
279 if (!tp->max_cdv)
280 tp->max_cdv = ATM_MAX_CDV;
281 return 0;
282 }
283
284 static int check_ci(const struct atm_vcc *vcc, short vpi, int vci)
285 {
286 struct hlist_head *head = &vcc_hash[vci & (VCC_HTABLE_SIZE - 1)];
287 struct hlist_node *node;
288 struct sock *s;
289 struct atm_vcc *walk;
290
291 sk_for_each(s, node, head) {
292 walk = atm_sk(s);
293 if (walk->dev != vcc->dev)
294 continue;
295 if (test_bit(ATM_VF_ADDR, &walk->flags) && walk->vpi == vpi &&
296 walk->vci == vci && ((walk->qos.txtp.traffic_class !=
297 ATM_NONE && vcc->qos.txtp.traffic_class != ATM_NONE) ||
298 (walk->qos.rxtp.traffic_class != ATM_NONE &&
299 vcc->qos.rxtp.traffic_class != ATM_NONE)))
300 return -EADDRINUSE;
301 }
302
303 /* allow VCCs with same VPI/VCI iff they don't collide on
304 TX/RX (but we may refuse such sharing for other reasons,
305 e.g. if protocol requires to have both channels) */
306
307 return 0;
308 }
309
310 static int find_ci(const struct atm_vcc *vcc, short *vpi, int *vci)
311 {
312 static short p; /* poor man's per-device cache */
313 static int c;
314 short old_p;
315 int old_c;
316 int err;
317
318 if (*vpi != ATM_VPI_ANY && *vci != ATM_VCI_ANY) {
319 err = check_ci(vcc, *vpi, *vci);
320 return err;
321 }
322 /* last scan may have left values out of bounds for current device */
323 if (*vpi != ATM_VPI_ANY)
324 p = *vpi;
325 else if (p >= 1 << vcc->dev->ci_range.vpi_bits)
326 p = 0;
327 if (*vci != ATM_VCI_ANY)
328 c = *vci;
329 else if (c < ATM_NOT_RSV_VCI || c >= 1 << vcc->dev->ci_range.vci_bits)
330 c = ATM_NOT_RSV_VCI;
331 old_p = p;
332 old_c = c;
333 do {
334 if (!check_ci(vcc, p, c)) {
335 *vpi = p;
336 *vci = c;
337 return 0;
338 }
339 if (*vci == ATM_VCI_ANY) {
340 c++;
341 if (c >= 1 << vcc->dev->ci_range.vci_bits)
342 c = ATM_NOT_RSV_VCI;
343 }
344 if ((c == ATM_NOT_RSV_VCI || *vci != ATM_VCI_ANY) &&
345 *vpi == ATM_VPI_ANY) {
346 p++;
347 if (p >= 1 << vcc->dev->ci_range.vpi_bits)
348 p = 0;
349 }
350 } while (old_p != p || old_c != c);
351 return -EADDRINUSE;
352 }
353
354 static int __vcc_connect(struct atm_vcc *vcc, struct atm_dev *dev, short vpi,
355 int vci)
356 {
357 struct sock *sk = sk_atm(vcc);
358 int error;
359
360 if ((vpi != ATM_VPI_UNSPEC && vpi != ATM_VPI_ANY &&
361 vpi >> dev->ci_range.vpi_bits) || (vci != ATM_VCI_UNSPEC &&
362 vci != ATM_VCI_ANY && vci >> dev->ci_range.vci_bits))
363 return -EINVAL;
364 if (vci > 0 && vci < ATM_NOT_RSV_VCI && !capable(CAP_NET_BIND_SERVICE))
365 return -EPERM;
366 error = -ENODEV;
367 if (!try_module_get(dev->ops->owner))
368 return error;
369 vcc->dev = dev;
370 write_lock_irq(&vcc_sklist_lock);
371 if (test_bit(ATM_DF_REMOVED, &dev->flags) ||
372 (error = find_ci(vcc, &vpi, &vci))) {
373 write_unlock_irq(&vcc_sklist_lock);
374 goto fail_module_put;
375 }
376 vcc->vpi = vpi;
377 vcc->vci = vci;
378 __vcc_insert_socket(sk);
379 write_unlock_irq(&vcc_sklist_lock);
380 switch (vcc->qos.aal) {
381 case ATM_AAL0:
382 error = atm_init_aal0(vcc);
383 vcc->stats = &dev->stats.aal0;
384 break;
385 case ATM_AAL34:
386 error = atm_init_aal34(vcc);
387 vcc->stats = &dev->stats.aal34;
388 break;
389 case ATM_NO_AAL:
390 /* ATM_AAL5 is also used in the "0 for default" case */
391 vcc->qos.aal = ATM_AAL5;
392 /* fall through */
393 case ATM_AAL5:
394 error = atm_init_aal5(vcc);
395 vcc->stats = &dev->stats.aal5;
396 break;
397 default:
398 error = -EPROTOTYPE;
399 }
400 if (!error)
401 error = adjust_tp(&vcc->qos.txtp, vcc->qos.aal);
402 if (!error)
403 error = adjust_tp(&vcc->qos.rxtp, vcc->qos.aal);
404 if (error)
405 goto fail;
406 pr_debug("VCC %d.%d, AAL %d\n", vpi, vci, vcc->qos.aal);
407 pr_debug(" TX: %d, PCR %d..%d, SDU %d\n",
408 vcc->qos.txtp.traffic_class,
409 vcc->qos.txtp.min_pcr,
410 vcc->qos.txtp.max_pcr,
411 vcc->qos.txtp.max_sdu);
412 pr_debug(" RX: %d, PCR %d..%d, SDU %d\n",
413 vcc->qos.rxtp.traffic_class,
414 vcc->qos.rxtp.min_pcr,
415 vcc->qos.rxtp.max_pcr,
416 vcc->qos.rxtp.max_sdu);
417
418 if (dev->ops->open) {
419 error = dev->ops->open(vcc);
420 if (error)
421 goto fail;
422 }
423 return 0;
424
425 fail:
426 vcc_remove_socket(sk);
427 fail_module_put:
428 module_put(dev->ops->owner);
429 /* ensure we get dev module ref count correct */
430 vcc->dev = NULL;
431 return error;
432 }
433
434 int vcc_connect(struct socket *sock, int itf, short vpi, int vci)
435 {
436 struct atm_dev *dev;
437 struct atm_vcc *vcc = ATM_SD(sock);
438 int error;
439
440 pr_debug("(vpi %d, vci %d)\n", vpi, vci);
441 if (sock->state == SS_CONNECTED)
442 return -EISCONN;
443 if (sock->state != SS_UNCONNECTED)
444 return -EINVAL;
445 if (!(vpi || vci))
446 return -EINVAL;
447
448 if (vpi != ATM_VPI_UNSPEC && vci != ATM_VCI_UNSPEC)
449 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
450 else
451 if (test_bit(ATM_VF_PARTIAL, &vcc->flags))
452 return -EINVAL;
453 pr_debug("(TX: cl %d,bw %d-%d,sdu %d; "
454 "RX: cl %d,bw %d-%d,sdu %d,AAL %s%d)\n",
455 vcc->qos.txtp.traffic_class, vcc->qos.txtp.min_pcr,
456 vcc->qos.txtp.max_pcr, vcc->qos.txtp.max_sdu,
457 vcc->qos.rxtp.traffic_class, vcc->qos.rxtp.min_pcr,
458 vcc->qos.rxtp.max_pcr, vcc->qos.rxtp.max_sdu,
459 vcc->qos.aal == ATM_AAL5 ? "" :
460 vcc->qos.aal == ATM_AAL0 ? "" : " ??? code ",
461 vcc->qos.aal == ATM_AAL0 ? 0 : vcc->qos.aal);
462 if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
463 return -EBADFD;
464 if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
465 vcc->qos.rxtp.traffic_class == ATM_ANYCLASS)
466 return -EINVAL;
467 if (likely(itf != ATM_ITF_ANY)) {
468 dev = try_then_request_module(atm_dev_lookup(itf),
469 "atm-device-%d", itf);
470 } else {
471 dev = NULL;
472 mutex_lock(&atm_dev_mutex);
473 if (!list_empty(&atm_devs)) {
474 dev = list_entry(atm_devs.next,
475 struct atm_dev, dev_list);
476 atm_dev_hold(dev);
477 }
478 mutex_unlock(&atm_dev_mutex);
479 }
480 if (!dev)
481 return -ENODEV;
482 error = __vcc_connect(vcc, dev, vpi, vci);
483 if (error) {
484 atm_dev_put(dev);
485 return error;
486 }
487 if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC)
488 set_bit(ATM_VF_PARTIAL, &vcc->flags);
489 if (test_bit(ATM_VF_READY, &ATM_SD(sock)->flags))
490 sock->state = SS_CONNECTED;
491 return 0;
492 }
493
494 int vcc_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
495 size_t size, int flags)
496 {
497 struct sock *sk = sock->sk;
498 struct atm_vcc *vcc;
499 struct sk_buff *skb;
500 int copied, error = -EINVAL;
501
502 if (sock->state != SS_CONNECTED)
503 return -ENOTCONN;
504 if (flags & ~MSG_DONTWAIT) /* only handle MSG_DONTWAIT */
505 return -EOPNOTSUPP;
506 vcc = ATM_SD(sock);
507 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
508 test_bit(ATM_VF_CLOSE, &vcc->flags) ||
509 !test_bit(ATM_VF_READY, &vcc->flags))
510 return 0;
511
512 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &error);
513 if (!skb)
514 return error;
515
516 copied = skb->len;
517 if (copied > size) {
518 copied = size;
519 msg->msg_flags |= MSG_TRUNC;
520 }
521
522 error = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
523 if (error)
524 return error;
525 sock_recv_ts_and_drops(msg, sk, skb);
526 pr_debug("%d -= %d\n", atomic_read(&sk->sk_rmem_alloc), skb->truesize);
527 atm_return(vcc, skb->truesize);
528 skb_free_datagram(sk, skb);
529 return copied;
530 }
531
532 int vcc_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
533 size_t total_len)
534 {
535 struct sock *sk = sock->sk;
536 DEFINE_WAIT(wait);
537 struct atm_vcc *vcc;
538 struct sk_buff *skb;
539 int eff, error;
540 const void __user *buff;
541 int size;
542
543 lock_sock(sk);
544 if (sock->state != SS_CONNECTED) {
545 error = -ENOTCONN;
546 goto out;
547 }
548 if (m->msg_name) {
549 error = -EISCONN;
550 goto out;
551 }
552 if (m->msg_iovlen != 1) {
553 error = -ENOSYS; /* fix this later @@@ */
554 goto out;
555 }
556 buff = m->msg_iov->iov_base;
557 size = m->msg_iov->iov_len;
558 vcc = ATM_SD(sock);
559 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
560 test_bit(ATM_VF_CLOSE, &vcc->flags) ||
561 !test_bit(ATM_VF_READY, &vcc->flags)) {
562 error = -EPIPE;
563 send_sig(SIGPIPE, current, 0);
564 goto out;
565 }
566 if (!size) {
567 error = 0;
568 goto out;
569 }
570 if (size < 0 || size > vcc->qos.txtp.max_sdu) {
571 error = -EMSGSIZE;
572 goto out;
573 }
574
575 eff = (size+3) & ~3; /* align to word boundary */
576 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
577 error = 0;
578 while (!(skb = alloc_tx(vcc, eff))) {
579 if (m->msg_flags & MSG_DONTWAIT) {
580 error = -EAGAIN;
581 break;
582 }
583 schedule();
584 if (signal_pending(current)) {
585 error = -ERESTARTSYS;
586 break;
587 }
588 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
589 test_bit(ATM_VF_CLOSE, &vcc->flags) ||
590 !test_bit(ATM_VF_READY, &vcc->flags)) {
591 error = -EPIPE;
592 send_sig(SIGPIPE, current, 0);
593 break;
594 }
595 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
596 }
597 finish_wait(sk_sleep(sk), &wait);
598 if (error)
599 goto out;
600 skb->dev = NULL; /* for paths shared with net_device interfaces */
601 ATM_SKB(skb)->atm_options = vcc->atm_options;
602 if (copy_from_user(skb_put(skb, size), buff, size)) {
603 kfree_skb(skb);
604 error = -EFAULT;
605 goto out;
606 }
607 if (eff != size)
608 memset(skb->data + size, 0, eff-size);
609 error = vcc->dev->ops->send(vcc, skb);
610 error = error ? error : size;
611 out:
612 release_sock(sk);
613 return error;
614 }
615
616 unsigned int vcc_poll(struct file *file, struct socket *sock, poll_table *wait)
617 {
618 struct sock *sk = sock->sk;
619 struct atm_vcc *vcc;
620 unsigned int mask;
621
622 sock_poll_wait(file, sk_sleep(sk), wait);
623 mask = 0;
624
625 vcc = ATM_SD(sock);
626
627 /* exceptional events */
628 if (sk->sk_err)
629 mask = POLLERR;
630
631 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
632 test_bit(ATM_VF_CLOSE, &vcc->flags))
633 mask |= POLLHUP;
634
635 /* readable? */
636 if (!skb_queue_empty(&sk->sk_receive_queue))
637 mask |= POLLIN | POLLRDNORM;
638
639 /* writable? */
640 if (sock->state == SS_CONNECTING &&
641 test_bit(ATM_VF_WAITING, &vcc->flags))
642 return mask;
643
644 if (vcc->qos.txtp.traffic_class != ATM_NONE &&
645 vcc_writable(sk))
646 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
647
648 return mask;
649 }
650
651 static int atm_change_qos(struct atm_vcc *vcc, struct atm_qos *qos)
652 {
653 int error;
654
655 /*
656 * Don't let the QoS change the already connected AAL type nor the
657 * traffic class.
658 */
659 if (qos->aal != vcc->qos.aal ||
660 qos->rxtp.traffic_class != vcc->qos.rxtp.traffic_class ||
661 qos->txtp.traffic_class != vcc->qos.txtp.traffic_class)
662 return -EINVAL;
663 error = adjust_tp(&qos->txtp, qos->aal);
664 if (!error)
665 error = adjust_tp(&qos->rxtp, qos->aal);
666 if (error)
667 return error;
668 if (!vcc->dev->ops->change_qos)
669 return -EOPNOTSUPP;
670 if (sk_atm(vcc)->sk_family == AF_ATMPVC)
671 return vcc->dev->ops->change_qos(vcc, qos, ATM_MF_SET);
672 return svc_change_qos(vcc, qos);
673 }
674
675 static int check_tp(const struct atm_trafprm *tp)
676 {
677 /* @@@ Should be merged with adjust_tp */
678 if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS)
679 return 0;
680 if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr &&
681 !tp->max_pcr)
682 return -EINVAL;
683 if (tp->min_pcr == ATM_MAX_PCR)
684 return -EINVAL;
685 if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR &&
686 tp->min_pcr > tp->max_pcr)
687 return -EINVAL;
688 /*
689 * We allow pcr to be outside [min_pcr,max_pcr], because later
690 * adjustment may still push it in the valid range.
691 */
692 return 0;
693 }
694
695 static int check_qos(const struct atm_qos *qos)
696 {
697 int error;
698
699 if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class)
700 return -EINVAL;
701 if (qos->txtp.traffic_class != qos->rxtp.traffic_class &&
702 qos->txtp.traffic_class && qos->rxtp.traffic_class &&
703 qos->txtp.traffic_class != ATM_ANYCLASS &&
704 qos->rxtp.traffic_class != ATM_ANYCLASS)
705 return -EINVAL;
706 error = check_tp(&qos->txtp);
707 if (error)
708 return error;
709 return check_tp(&qos->rxtp);
710 }
711
712 int vcc_setsockopt(struct socket *sock, int level, int optname,
713 char __user *optval, unsigned int optlen)
714 {
715 struct atm_vcc *vcc;
716 unsigned long value;
717 int error;
718
719 if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname))
720 return -EINVAL;
721
722 vcc = ATM_SD(sock);
723 switch (optname) {
724 case SO_ATMQOS:
725 {
726 struct atm_qos qos;
727
728 if (copy_from_user(&qos, optval, sizeof(qos)))
729 return -EFAULT;
730 error = check_qos(&qos);
731 if (error)
732 return error;
733 if (sock->state == SS_CONNECTED)
734 return atm_change_qos(vcc, &qos);
735 if (sock->state != SS_UNCONNECTED)
736 return -EBADFD;
737 vcc->qos = qos;
738 set_bit(ATM_VF_HASQOS, &vcc->flags);
739 return 0;
740 }
741 case SO_SETCLP:
742 if (get_user(value, (unsigned long __user *)optval))
743 return -EFAULT;
744 if (value)
745 vcc->atm_options |= ATM_ATMOPT_CLP;
746 else
747 vcc->atm_options &= ~ATM_ATMOPT_CLP;
748 return 0;
749 default:
750 if (level == SOL_SOCKET)
751 return -EINVAL;
752 break;
753 }
754 if (!vcc->dev || !vcc->dev->ops->setsockopt)
755 return -EINVAL;
756 return vcc->dev->ops->setsockopt(vcc, level, optname, optval, optlen);
757 }
758
759 int vcc_getsockopt(struct socket *sock, int level, int optname,
760 char __user *optval, int __user *optlen)
761 {
762 struct atm_vcc *vcc;
763 int len;
764
765 if (get_user(len, optlen))
766 return -EFAULT;
767 if (__SO_LEVEL_MATCH(optname, level) && len != __SO_SIZE(optname))
768 return -EINVAL;
769
770 vcc = ATM_SD(sock);
771 switch (optname) {
772 case SO_ATMQOS:
773 if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
774 return -EINVAL;
775 return copy_to_user(optval, &vcc->qos, sizeof(vcc->qos))
776 ? -EFAULT : 0;
777 case SO_SETCLP:
778 return put_user(vcc->atm_options & ATM_ATMOPT_CLP ? 1 : 0,
779 (unsigned long __user *)optval) ? -EFAULT : 0;
780 case SO_ATMPVC:
781 {
782 struct sockaddr_atmpvc pvc;
783
784 if (!vcc->dev || !test_bit(ATM_VF_ADDR, &vcc->flags))
785 return -ENOTCONN;
786 pvc.sap_family = AF_ATMPVC;
787 pvc.sap_addr.itf = vcc->dev->number;
788 pvc.sap_addr.vpi = vcc->vpi;
789 pvc.sap_addr.vci = vcc->vci;
790 return copy_to_user(optval, &pvc, sizeof(pvc)) ? -EFAULT : 0;
791 }
792 default:
793 if (level == SOL_SOCKET)
794 return -EINVAL;
795 break;
796 }
797 if (!vcc->dev || !vcc->dev->ops->getsockopt)
798 return -EINVAL;
799 return vcc->dev->ops->getsockopt(vcc, level, optname, optval, len);
800 }
801
802 int register_atmdevice_notifier(struct notifier_block *nb)
803 {
804 return atomic_notifier_chain_register(&atm_dev_notify_chain, nb);
805 }
806 EXPORT_SYMBOL_GPL(register_atmdevice_notifier);
807
808 void unregister_atmdevice_notifier(struct notifier_block *nb)
809 {
810 atomic_notifier_chain_unregister(&atm_dev_notify_chain, nb);
811 }
812 EXPORT_SYMBOL_GPL(unregister_atmdevice_notifier);
813
814 static int __init atm_init(void)
815 {
816 int error;
817
818 error = proto_register(&vcc_proto, 0);
819 if (error < 0)
820 goto out;
821 error = atmpvc_init();
822 if (error < 0) {
823 pr_err("atmpvc_init() failed with %d\n", error);
824 goto out_unregister_vcc_proto;
825 }
826 error = atmsvc_init();
827 if (error < 0) {
828 pr_err("atmsvc_init() failed with %d\n", error);
829 goto out_atmpvc_exit;
830 }
831 error = atm_proc_init();
832 if (error < 0) {
833 pr_err("atm_proc_init() failed with %d\n", error);
834 goto out_atmsvc_exit;
835 }
836 error = atm_sysfs_init();
837 if (error < 0) {
838 pr_err("atm_sysfs_init() failed with %d\n", error);
839 goto out_atmproc_exit;
840 }
841 out:
842 return error;
843 out_atmproc_exit:
844 atm_proc_exit();
845 out_atmsvc_exit:
846 atmsvc_exit();
847 out_atmpvc_exit:
848 atmsvc_exit();
849 out_unregister_vcc_proto:
850 proto_unregister(&vcc_proto);
851 goto out;
852 }
853
854 static void __exit atm_exit(void)
855 {
856 atm_proc_exit();
857 atm_sysfs_exit();
858 atmsvc_exit();
859 atmpvc_exit();
860 proto_unregister(&vcc_proto);
861 }
862
863 subsys_initcall(atm_init);
864
865 module_exit(atm_exit);
866
867 MODULE_LICENSE("GPL");
868 MODULE_ALIAS_NETPROTO(PF_ATMPVC);
869 MODULE_ALIAS_NETPROTO(PF_ATMSVC);