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staging: rtl8192u: fix spaces in array indexing in r8192U_core.c
[linux-2.6.git] / net / atm / common.c
blob737bef59ce899adc0a3e0ba67ea3d56536e5b7e5
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 msg->msg_namelen = 0;
535
536 if (sock->state != SS_CONNECTED)
537 return -ENOTCONN;
538
539 /* only handle MSG_DONTWAIT and MSG_PEEK */
540 if (flags & ~(MSG_DONTWAIT | MSG_PEEK))
541 return -EOPNOTSUPP;
542
543 vcc = ATM_SD(sock);
544 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
545 test_bit(ATM_VF_CLOSE, &vcc->flags) ||
546 !test_bit(ATM_VF_READY, &vcc->flags))
547 return 0;
548
549 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &error);
550 if (!skb)
551 return error;
552
553 copied = skb->len;
554 if (copied > size) {
555 copied = size;
556 msg->msg_flags |= MSG_TRUNC;
557 }
558
559 error = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
560 if (error)
561 return error;
562 sock_recv_ts_and_drops(msg, sk, skb);
563
564 if (!(flags & MSG_PEEK)) {
565 pr_debug("%d -= %d\n", atomic_read(&sk->sk_rmem_alloc),
566 skb->truesize);
567 atm_return(vcc, skb->truesize);
568 }
569
570 skb_free_datagram(sk, skb);
571 return copied;
572 }
573
574 int vcc_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
575 size_t total_len)
576 {
577 struct sock *sk = sock->sk;
578 DEFINE_WAIT(wait);
579 struct atm_vcc *vcc;
580 struct sk_buff *skb;
581 int eff, error;
582 const void __user *buff;
583 int size;
584
585 lock_sock(sk);
586 if (sock->state != SS_CONNECTED) {
587 error = -ENOTCONN;
588 goto out;
589 }
590 if (m->msg_name) {
591 error = -EISCONN;
592 goto out;
593 }
594 if (m->msg_iovlen != 1) {
595 error = -ENOSYS; /* fix this later @@@ */
596 goto out;
597 }
598 buff = m->msg_iov->iov_base;
599 size = m->msg_iov->iov_len;
600 vcc = ATM_SD(sock);
601 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
602 test_bit(ATM_VF_CLOSE, &vcc->flags) ||
603 !test_bit(ATM_VF_READY, &vcc->flags)) {
604 error = -EPIPE;
605 send_sig(SIGPIPE, current, 0);
606 goto out;
607 }
608 if (!size) {
609 error = 0;
610 goto out;
611 }
612 if (size < 0 || size > vcc->qos.txtp.max_sdu) {
613 error = -EMSGSIZE;
614 goto out;
615 }
616
617 eff = (size+3) & ~3; /* align to word boundary */
618 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
619 error = 0;
620 while (!(skb = alloc_tx(vcc, eff))) {
621 if (m->msg_flags & MSG_DONTWAIT) {
622 error = -EAGAIN;
623 break;
624 }
625 schedule();
626 if (signal_pending(current)) {
627 error = -ERESTARTSYS;
628 break;
629 }
630 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
631 test_bit(ATM_VF_CLOSE, &vcc->flags) ||
632 !test_bit(ATM_VF_READY, &vcc->flags)) {
633 error = -EPIPE;
634 send_sig(SIGPIPE, current, 0);
635 break;
636 }
637 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
638 }
639 finish_wait(sk_sleep(sk), &wait);
640 if (error)
641 goto out;
642 skb->dev = NULL; /* for paths shared with net_device interfaces */
643 ATM_SKB(skb)->atm_options = vcc->atm_options;
644 if (copy_from_user(skb_put(skb, size), buff, size)) {
645 kfree_skb(skb);
646 error = -EFAULT;
647 goto out;
648 }
649 if (eff != size)
650 memset(skb->data + size, 0, eff-size);
651 error = vcc->dev->ops->send(vcc, skb);
652 error = error ? error : size;
653 out:
654 release_sock(sk);
655 return error;
656 }
657
658 unsigned int vcc_poll(struct file *file, struct socket *sock, poll_table *wait)
659 {
660 struct sock *sk = sock->sk;
661 struct atm_vcc *vcc;
662 unsigned int mask;
663
664 sock_poll_wait(file, sk_sleep(sk), wait);
665 mask = 0;
666
667 vcc = ATM_SD(sock);
668
669 /* exceptional events */
670 if (sk->sk_err)
671 mask = POLLERR;
672
673 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
674 test_bit(ATM_VF_CLOSE, &vcc->flags))
675 mask |= POLLHUP;
676
677 /* readable? */
678 if (!skb_queue_empty(&sk->sk_receive_queue))
679 mask |= POLLIN | POLLRDNORM;
680
681 /* writable? */
682 if (sock->state == SS_CONNECTING &&
683 test_bit(ATM_VF_WAITING, &vcc->flags))
684 return mask;
685
686 if (vcc->qos.txtp.traffic_class != ATM_NONE &&
687 vcc_writable(sk))
688 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
689
690 return mask;
691 }
692
693 static int atm_change_qos(struct atm_vcc *vcc, struct atm_qos *qos)
694 {
695 int error;
696
697 /*
698 * Don't let the QoS change the already connected AAL type nor the
699 * traffic class.
700 */
701 if (qos->aal != vcc->qos.aal ||
702 qos->rxtp.traffic_class != vcc->qos.rxtp.traffic_class ||
703 qos->txtp.traffic_class != vcc->qos.txtp.traffic_class)
704 return -EINVAL;
705 error = adjust_tp(&qos->txtp, qos->aal);
706 if (!error)
707 error = adjust_tp(&qos->rxtp, qos->aal);
708 if (error)
709 return error;
710 if (!vcc->dev->ops->change_qos)
711 return -EOPNOTSUPP;
712 if (sk_atm(vcc)->sk_family == AF_ATMPVC)
713 return vcc->dev->ops->change_qos(vcc, qos, ATM_MF_SET);
714 return svc_change_qos(vcc, qos);
715 }
716
717 static int check_tp(const struct atm_trafprm *tp)
718 {
719 /* @@@ Should be merged with adjust_tp */
720 if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS)
721 return 0;
722 if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr &&
723 !tp->max_pcr)
724 return -EINVAL;
725 if (tp->min_pcr == ATM_MAX_PCR)
726 return -EINVAL;
727 if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR &&
728 tp->min_pcr > tp->max_pcr)
729 return -EINVAL;
730 /*
731 * We allow pcr to be outside [min_pcr,max_pcr], because later
732 * adjustment may still push it in the valid range.
733 */
734 return 0;
735 }
736
737 static int check_qos(const struct atm_qos *qos)
738 {
739 int error;
740
741 if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class)
742 return -EINVAL;
743 if (qos->txtp.traffic_class != qos->rxtp.traffic_class &&
744 qos->txtp.traffic_class && qos->rxtp.traffic_class &&
745 qos->txtp.traffic_class != ATM_ANYCLASS &&
746 qos->rxtp.traffic_class != ATM_ANYCLASS)
747 return -EINVAL;
748 error = check_tp(&qos->txtp);
749 if (error)
750 return error;
751 return check_tp(&qos->rxtp);
752 }
753
754 int vcc_setsockopt(struct socket *sock, int level, int optname,
755 char __user *optval, unsigned int optlen)
756 {
757 struct atm_vcc *vcc;
758 unsigned long value;
759 int error;
760
761 if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname))
762 return -EINVAL;
763
764 vcc = ATM_SD(sock);
765 switch (optname) {
766 case SO_ATMQOS:
767 {
768 struct atm_qos qos;
769
770 if (copy_from_user(&qos, optval, sizeof(qos)))
771 return -EFAULT;
772 error = check_qos(&qos);
773 if (error)
774 return error;
775 if (sock->state == SS_CONNECTED)
776 return atm_change_qos(vcc, &qos);
777 if (sock->state != SS_UNCONNECTED)
778 return -EBADFD;
779 vcc->qos = qos;
780 set_bit(ATM_VF_HASQOS, &vcc->flags);
781 return 0;
782 }
783 case SO_SETCLP:
784 if (get_user(value, (unsigned long __user *)optval))
785 return -EFAULT;
786 if (value)
787 vcc->atm_options |= ATM_ATMOPT_CLP;
788 else
789 vcc->atm_options &= ~ATM_ATMOPT_CLP;
790 return 0;
791 default:
792 if (level == SOL_SOCKET)
793 return -EINVAL;
794 break;
795 }
796 if (!vcc->dev || !vcc->dev->ops->setsockopt)
797 return -EINVAL;
798 return vcc->dev->ops->setsockopt(vcc, level, optname, optval, optlen);
799 }
800
801 int vcc_getsockopt(struct socket *sock, int level, int optname,
802 char __user *optval, int __user *optlen)
803 {
804 struct atm_vcc *vcc;
805 int len;
806
807 if (get_user(len, optlen))
808 return -EFAULT;
809 if (__SO_LEVEL_MATCH(optname, level) && len != __SO_SIZE(optname))
810 return -EINVAL;
811
812 vcc = ATM_SD(sock);
813 switch (optname) {
814 case SO_ATMQOS:
815 if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
816 return -EINVAL;
817 return copy_to_user(optval, &vcc->qos, sizeof(vcc->qos))
818 ? -EFAULT : 0;
819 case SO_SETCLP:
820 return put_user(vcc->atm_options & ATM_ATMOPT_CLP ? 1 : 0,
821 (unsigned long __user *)optval) ? -EFAULT : 0;
822 case SO_ATMPVC:
823 {
824 struct sockaddr_atmpvc pvc;
825
826 if (!vcc->dev || !test_bit(ATM_VF_ADDR, &vcc->flags))
827 return -ENOTCONN;
828 memset(&pvc, 0, sizeof(pvc));
829 pvc.sap_family = AF_ATMPVC;
830 pvc.sap_addr.itf = vcc->dev->number;
831 pvc.sap_addr.vpi = vcc->vpi;
832 pvc.sap_addr.vci = vcc->vci;
833 return copy_to_user(optval, &pvc, sizeof(pvc)) ? -EFAULT : 0;
834 }
835 default:
836 if (level == SOL_SOCKET)
837 return -EINVAL;
838 break;
839 }
840 if (!vcc->dev || !vcc->dev->ops->getsockopt)
841 return -EINVAL;
842 return vcc->dev->ops->getsockopt(vcc, level, optname, optval, len);
843 }
844
845 int register_atmdevice_notifier(struct notifier_block *nb)
846 {
847 return atomic_notifier_chain_register(&atm_dev_notify_chain, nb);
848 }
849 EXPORT_SYMBOL_GPL(register_atmdevice_notifier);
850
851 void unregister_atmdevice_notifier(struct notifier_block *nb)
852 {
853 atomic_notifier_chain_unregister(&atm_dev_notify_chain, nb);
854 }
855 EXPORT_SYMBOL_GPL(unregister_atmdevice_notifier);
856
857 static int __init atm_init(void)
858 {
859 int error;
860
861 error = proto_register(&vcc_proto, 0);
862 if (error < 0)
863 goto out;
864 error = atmpvc_init();
865 if (error < 0) {
866 pr_err("atmpvc_init() failed with %d\n", error);
867 goto out_unregister_vcc_proto;
868 }
869 error = atmsvc_init();
870 if (error < 0) {
871 pr_err("atmsvc_init() failed with %d\n", error);
872 goto out_atmpvc_exit;
873 }
874 error = atm_proc_init();
875 if (error < 0) {
876 pr_err("atm_proc_init() failed with %d\n", error);
877 goto out_atmsvc_exit;
878 }
879 error = atm_sysfs_init();
880 if (error < 0) {
881 pr_err("atm_sysfs_init() failed with %d\n", error);
882 goto out_atmproc_exit;
883 }
884 out:
885 return error;
886 out_atmproc_exit:
887 atm_proc_exit();
888 out_atmsvc_exit:
889 atmsvc_exit();
890 out_atmpvc_exit:
891 atmsvc_exit();
892 out_unregister_vcc_proto:
893 proto_unregister(&vcc_proto);
894 goto out;
895 }
896
897 static void __exit atm_exit(void)
898 {
899 atm_proc_exit();
900 atm_sysfs_exit();
901 atmsvc_exit();
902 atmpvc_exit();
903 proto_unregister(&vcc_proto);
904 }
905
906 subsys_initcall(atm_init);
907
908 module_exit(atm_exit);
909
910 MODULE_LICENSE("GPL");
911 MODULE_ALIAS_NETPROTO(PF_ATMPVC);
912 MODULE_ALIAS_NETPROTO(PF_ATMSVC);
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