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vmxnet3: Fix race between dev_open() and register_netdev()
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / atm / common.c
CommitLineData
1da177e4
LT		 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
99824461 5#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
1da177e4 6
1da177e4
LT		 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>
e49332bd 15#include <linux/mm.h>
1da177e4
LT		 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>
5a0e3ad6 21#include <linux/slab.h>
1da177e4 22#include <net/sock.h> /* struct sock */
a8147d73
JP		 23#include <linux/uaccess.h>
24#include <linux/poll.h>
1da177e4 25
60063497 26#include <linux/atomic.h>
1da177e4
LT		 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
1da177e4 34struct hlist_head vcc_hash[VCC_HTABLE_SIZE];
a8147d73
JP		 35EXPORT_SYMBOL(vcc_hash);
36
1da177e4 37DEFINE_RWLOCK(vcc_sklist_lock);
a8147d73 38EXPORT_SYMBOL(vcc_sklist_lock);
1da177e4 39
7313bb8f
KH		 40static ATOMIC_NOTIFIER_HEAD(atm_dev_notify_chain);
41
1da177e4
LT		 42static void __vcc_insert_socket(struct sock *sk)
43{
44 struct atm_vcc *vcc = atm_sk(sk);
a8147d73 45 struct hlist_head *head = &vcc_hash[vcc->vci & (VCC_HTABLE_SIZE - 1)];
81c3d547 46 sk->sk_hash = vcc->vci & (VCC_HTABLE_SIZE - 1);
1da177e4
LT		 47 sk_add_node(sk, head);
48}
49
50void 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}
a8147d73 56EXPORT_SYMBOL(vcc_insert_socket);
1da177e4
LT		 57
58static 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
a8147d73 65static struct sk_buff *alloc_tx(struct atm_vcc *vcc, unsigned int size)
1da177e4
LT		 66{
67 struct sk_buff *skb;
68 struct sock *sk = sk_atm(vcc);
69
81e2a3d5 70 if (sk_wmem_alloc_get(sk) && !atm_may_send(vcc, size)) {
52240062 71 pr_debug("Sorry: wmem_alloc = %d, size = %d, sndbuf = %d\n",
99824461 72 sk_wmem_alloc_get(sk), size, sk->sk_sndbuf);
1da177e4
LT		 73 return NULL;
74 }
81e2a3d5
ED		 75 while (!(skb = alloc_skb(size, GFP_KERNEL)))
76 schedule();
a8147d73 77 pr_debug("%d += %d\n", sk_wmem_alloc_get(sk), skb->truesize);
1da177e4
LT		 78 atomic_add(skb->truesize, &sk->sk_wmem_alloc);
79 return skb;
80}
81
1da177e4
LT		 82static void vcc_sock_destruct(struct sock *sk)
83{
84 if (atomic_read(&sk->sk_rmem_alloc))
a8147d73
JP		 85 printk(KERN_DEBUG "%s: rmem leakage (%d bytes) detected.\n",
86 __func__, atomic_read(&sk->sk_rmem_alloc));
1da177e4
LT		 87
88 if (atomic_read(&sk->sk_wmem_alloc))
a8147d73
JP		 89 printk(KERN_DEBUG "%s: wmem leakage (%d bytes) detected.\n",
90 __func__, atomic_read(&sk->sk_wmem_alloc));
1da177e4
LT		 91}
92
93static void vcc_def_wakeup(struct sock *sk)
94{
43815482
ED		 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();
1da177e4
LT		 102}
103
104static inline int vcc_writable(struct sock *sk)
105{
106 struct atm_vcc *vcc = atm_sk(sk);
107
108 return (vcc->qos.txtp.max_sdu +
f7d57453 109 atomic_read(&sk->sk_wmem_alloc)) <= sk->sk_sndbuf;
1da177e4
LT		 110}
111
112static void vcc_write_space(struct sock *sk)
f7d57453 113{
43815482
ED		 114 struct socket_wq *wq;
115
116 rcu_read_lock();
1da177e4
LT		 117
118 if (vcc_writable(sk)) {
43815482
ED		 119 wq = rcu_dereference(sk->sk_wq);
120 if (wq_has_sleeper(wq))
121 wake_up_interruptible(&wq->wait);
1da177e4 122
8d8ad9d7 123 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
1da177e4
LT		 124 }
125
43815482 126 rcu_read_unlock();
1da177e4
LT		 127}
128
129static struct proto vcc_proto = {
130 .name = "VCC",
131 .owner = THIS_MODULE,
132 .obj_size = sizeof(struct atm_vcc),
133};
f7d57453 134
1b8d7ae4 135int vcc_create(struct net *net, struct socket *sock, int protocol, int family)
1da177e4
LT		 136{
137 struct sock *sk;
138 struct atm_vcc *vcc;
139
140 sock->sk = NULL;
141 if (sock->type == SOCK_STREAM)
142 return -EINVAL;
6257ff21 143 sk = sk_alloc(net, family, GFP_KERNEL, &vcc_proto);
1da177e4
LT		 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;
a8147d73
JP		 152 memset(&vcc->local, 0, sizeof(struct sockaddr_atmsvc));
153 memset(&vcc->remote, 0, sizeof(struct sockaddr_atmsvc));
1da177e4 154 vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */
81e2a3d5 155 atomic_set(&sk->sk_wmem_alloc, 1);
1da177e4
LT		 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
1da177e4
LT		 166static 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
1da177e4 179 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
a8147d73 180 atm_return(vcc, skb->truesize);
1da177e4
LT		 181 kfree_skb(skb);
182 }
183
184 module_put(vcc->dev->ops->owner);
185 atm_dev_put(vcc->dev);
186 }
9301e320
CW		 187
188 vcc_remove_socket(sk);
1da177e4
LT		 189}
190
1da177e4
LT		 191int 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
1da177e4
LT		 205void 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}
1da177e4
LT		 215EXPORT_SYMBOL(vcc_release_async);
216
4e55f578
JBD		 217void vcc_process_recv_queue(struct atm_vcc *vcc)
218{
219 struct sk_buff_head queue, *rq;
220 struct sk_buff *skb, *tmp;
221 unsigned long flags;
222
223 __skb_queue_head_init(&queue);
224 rq = &sk_atm(vcc)->sk_receive_queue;
225
226 spin_lock_irqsave(&rq->lock, flags);
227 skb_queue_splice_init(rq, &queue);
228 spin_unlock_irqrestore(&rq->lock, flags);
229
230 skb_queue_walk_safe(&queue, skb, tmp) {
231 __skb_unlink(skb, &queue);
232 vcc->push(vcc, skb);
233 }
234}
235EXPORT_SYMBOL(vcc_process_recv_queue);
236
7313bb8f
KH		 237void atm_dev_signal_change(struct atm_dev *dev, char signal)
238{
239 pr_debug("%s signal=%d dev=%p number=%d dev->signal=%d\n",
240 __func__, signal, dev, dev->number, dev->signal);
241
242 /* atm driver sending invalid signal */
243 WARN_ON(signal < ATM_PHY_SIG_LOST || signal > ATM_PHY_SIG_FOUND);
244
245 if (dev->signal == signal)
246 return; /* no change */
247
248 dev->signal = signal;
249
250 atomic_notifier_call_chain(&atm_dev_notify_chain, signal, dev);
251}
252EXPORT_SYMBOL(atm_dev_signal_change);
1da177e4 253
64bf69dd
SG		 254void atm_dev_release_vccs(struct atm_dev *dev)
255{
256 int i;
257
258 write_lock_irq(&vcc_sklist_lock);
259 for (i = 0; i < VCC_HTABLE_SIZE; i++) {
260 struct hlist_head *head = &vcc_hash[i];
261 struct hlist_node *node, *tmp;
262 struct sock *s;
263 struct atm_vcc *vcc;
264
265 sk_for_each_safe(s, node, tmp, head) {
266 vcc = atm_sk(s);
267 if (vcc->dev == dev) {
268 vcc_release_async(vcc, -EPIPE);
269 sk_del_node_init(s);
270 }
271 }
272 }
273 write_unlock_irq(&vcc_sklist_lock);
274}
c031235b 275EXPORT_SYMBOL(atm_dev_release_vccs);
64bf69dd 276
a8147d73 277static int adjust_tp(struct atm_trafprm *tp, unsigned char aal)
1da177e4
LT		 278{
279 int max_sdu;
280
a8147d73
JP		 281 if (!tp->traffic_class)
282 return 0;
1da177e4 283 switch (aal) {
a8147d73
JP		 284 case ATM_AAL0:
285 max_sdu = ATM_CELL_SIZE-1;
286 break;
287 case ATM_AAL34:
288 max_sdu = ATM_MAX_AAL34_PDU;
289 break;
290 default:
291 pr_warning("AAL problems ... (%d)\n", aal);
292 /* fall through */
293 case ATM_AAL5:
294 max_sdu = ATM_MAX_AAL5_PDU;
1da177e4 295 }
a8147d73
JP		 296 if (!tp->max_sdu)
297 tp->max_sdu = max_sdu;
298 else if (tp->max_sdu > max_sdu)
299 return -EINVAL;
300 if (!tp->max_cdv)
301 tp->max_cdv = ATM_MAX_CDV;
1da177e4
LT		 302 return 0;
303}
304
61c33e01 305static int check_ci(const struct atm_vcc *vcc, short vpi, int vci)
1da177e4 306{
a8147d73 307 struct hlist_head *head = &vcc_hash[vci & (VCC_HTABLE_SIZE - 1)];
1da177e4
LT		 308 struct hlist_node *node;
309 struct sock *s;
310 struct atm_vcc *walk;
311
312 sk_for_each(s, node, head) {
313 walk = atm_sk(s);
314 if (walk->dev != vcc->dev)
315 continue;
316 if (test_bit(ATM_VF_ADDR, &walk->flags) && walk->vpi == vpi &&
317 walk->vci == vci && ((walk->qos.txtp.traffic_class !=
318 ATM_NONE && vcc->qos.txtp.traffic_class != ATM_NONE) ||
319 (walk->qos.rxtp.traffic_class != ATM_NONE &&
320 vcc->qos.rxtp.traffic_class != ATM_NONE)))
321 return -EADDRINUSE;
322 }
323
324 /* allow VCCs with same VPI/VCI iff they don't collide on
325 TX/RX (but we may refuse such sharing for other reasons,
326 e.g. if protocol requires to have both channels) */
327
328 return 0;
329}
330
61c33e01 331static int find_ci(const struct atm_vcc *vcc, short *vpi, int *vci)
1da177e4
LT		 332{
333 static short p; /* poor man's per-device cache */
334 static int c;
335 short old_p;
336 int old_c;
337 int err;
338
339 if (*vpi != ATM_VPI_ANY && *vci != ATM_VCI_ANY) {
340 err = check_ci(vcc, *vpi, *vci);
341 return err;
342 }
343 /* last scan may have left values out of bounds for current device */
344 if (*vpi != ATM_VPI_ANY)
345 p = *vpi;
346 else if (p >= 1 << vcc->dev->ci_range.vpi_bits)
347 p = 0;
348 if (*vci != ATM_VCI_ANY)
349 c = *vci;
350 else if (c < ATM_NOT_RSV_VCI || c >= 1 << vcc->dev->ci_range.vci_bits)
351 c = ATM_NOT_RSV_VCI;
352 old_p = p;
353 old_c = c;
354 do {
355 if (!check_ci(vcc, p, c)) {
356 *vpi = p;
357 *vci = c;
358 return 0;
359 }
360 if (*vci == ATM_VCI_ANY) {
361 c++;
362 if (c >= 1 << vcc->dev->ci_range.vci_bits)
363 c = ATM_NOT_RSV_VCI;
364 }
365 if ((c == ATM_NOT_RSV_VCI || *vci != ATM_VCI_ANY) &&
366 *vpi == ATM_VPI_ANY) {
367 p++;
a8147d73
JP		 368 if (p >= 1 << vcc->dev->ci_range.vpi_bits)
369 p = 0;
1da177e4 370 }
a8147d73 371 } while (old_p != p || old_c != c);
1da177e4
LT		 372 return -EADDRINUSE;
373}
374
1da177e4
LT		 375static int __vcc_connect(struct atm_vcc *vcc, struct atm_dev *dev, short vpi,
376 int vci)
377{
378 struct sock *sk = sk_atm(vcc);
379 int error;
380
381 if ((vpi != ATM_VPI_UNSPEC && vpi != ATM_VPI_ANY &&
382 vpi >> dev->ci_range.vpi_bits) || (vci != ATM_VCI_UNSPEC &&
383 vci != ATM_VCI_ANY && vci >> dev->ci_range.vci_bits))
384 return -EINVAL;
385 if (vci > 0 && vci < ATM_NOT_RSV_VCI && !capable(CAP_NET_BIND_SERVICE))
386 return -EPERM;
64bf69dd 387 error = -ENODEV;
1da177e4 388 if (!try_module_get(dev->ops->owner))
64bf69dd 389 return error;
1da177e4
LT		 390 vcc->dev = dev;
391 write_lock_irq(&vcc_sklist_lock);
f7d57453 392 if (test_bit(ATM_DF_REMOVED, &dev->flags) ||
64bf69dd 393 (error = find_ci(vcc, &vpi, &vci))) {
1da177e4
LT		 394 write_unlock_irq(&vcc_sklist_lock);
395 goto fail_module_put;
396 }
397 vcc->vpi = vpi;
398 vcc->vci = vci;
399 __vcc_insert_socket(sk);
400 write_unlock_irq(&vcc_sklist_lock);
401 switch (vcc->qos.aal) {
a8147d73
JP		 402 case ATM_AAL0:
403 error = atm_init_aal0(vcc);
404 vcc->stats = &dev->stats.aal0;
405 break;
406 case ATM_AAL34:
407 error = atm_init_aal34(vcc);
408 vcc->stats = &dev->stats.aal34;
409 break;
410 case ATM_NO_AAL:
411 /* ATM_AAL5 is also used in the "0 for default" case */
412 vcc->qos.aal = ATM_AAL5;
413 /* fall through */
414 case ATM_AAL5:
415 error = atm_init_aal5(vcc);
416 vcc->stats = &dev->stats.aal5;
417 break;
418 default:
419 error = -EPROTOTYPE;
1da177e4 420 }
a8147d73
JP		 421 if (!error)
422 error = adjust_tp(&vcc->qos.txtp, vcc->qos.aal);
423 if (!error)
424 error = adjust_tp(&vcc->qos.rxtp, vcc->qos.aal);
1da177e4
LT		 425 if (error)
426 goto fail;
99824461
JP		 427 pr_debug("VCC %d.%d, AAL %d\n", vpi, vci, vcc->qos.aal);
428 pr_debug(" TX: %d, PCR %d..%d, SDU %d\n",
429 vcc->qos.txtp.traffic_class,
430 vcc->qos.txtp.min_pcr,
431 vcc->qos.txtp.max_pcr,
432 vcc->qos.txtp.max_sdu);
433 pr_debug(" RX: %d, PCR %d..%d, SDU %d\n",
434 vcc->qos.rxtp.traffic_class,
435 vcc->qos.rxtp.min_pcr,
436 vcc->qos.rxtp.max_pcr,
437 vcc->qos.rxtp.max_sdu);
1da177e4
LT		 438
439 if (dev->ops->open) {
a8147d73
JP		 440 error = dev->ops->open(vcc);
441 if (error)
1da177e4
LT		 442 goto fail;
443 }
444 return 0;
445
446fail:
447 vcc_remove_socket(sk);
448fail_module_put:
449 module_put(dev->ops->owner);
450 /* ensure we get dev module ref count correct */
451 vcc->dev = NULL;
452 return error;
453}
454
1da177e4
LT		 455int vcc_connect(struct socket *sock, int itf, short vpi, int vci)
456{
457 struct atm_dev *dev;
458 struct atm_vcc *vcc = ATM_SD(sock);
459 int error;
460
99824461 461 pr_debug("(vpi %d, vci %d)\n", vpi, vci);
1da177e4
LT		 462 if (sock->state == SS_CONNECTED)
463 return -EISCONN;
464 if (sock->state != SS_UNCONNECTED)
465 return -EINVAL;
466 if (!(vpi || vci))
467 return -EINVAL;
468
469 if (vpi != ATM_VPI_UNSPEC && vci != ATM_VCI_UNSPEC)
a8147d73 470 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1da177e4 471 else
a8147d73 472 if (test_bit(ATM_VF_PARTIAL, &vcc->flags))
1da177e4 473 return -EINVAL;
99824461
JP		 474 pr_debug("(TX: cl %d,bw %d-%d,sdu %d; "
475 "RX: cl %d,bw %d-%d,sdu %d,AAL %s%d)\n",
476 vcc->qos.txtp.traffic_class, vcc->qos.txtp.min_pcr,
477 vcc->qos.txtp.max_pcr, vcc->qos.txtp.max_sdu,
478 vcc->qos.rxtp.traffic_class, vcc->qos.rxtp.min_pcr,
a8147d73 479 vcc->qos.rxtp.max_pcr, vcc->qos.rxtp.max_sdu,
99824461
JP		 480 vcc->qos.aal == ATM_AAL5 ? "" :
481 vcc->qos.aal == ATM_AAL0 ? "" : " ??? code ",
482 vcc->qos.aal == ATM_AAL0 ? 0 : vcc->qos.aal);
1da177e4
LT		 483 if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
484 return -EBADFD;
485 if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
486 vcc->qos.rxtp.traffic_class == ATM_ANYCLASS)
487 return -EINVAL;
c9933d08 488 if (likely(itf != ATM_ITF_ANY)) {
a8147d73
JP		 489 dev = try_then_request_module(atm_dev_lookup(itf),
490 "atm-device-%d", itf);
1da177e4 491 } else {
1da177e4 492 dev = NULL;
57b47a53 493 mutex_lock(&atm_dev_mutex);
c9933d08 494 if (!list_empty(&atm_devs)) {
a8147d73
JP		 495 dev = list_entry(atm_devs.next,
496 struct atm_dev, dev_list);
1da177e4 497 atm_dev_hold(dev);
1da177e4 498 }
57b47a53 499 mutex_unlock(&atm_dev_mutex);
c9933d08
MBJ		 500 }
501 if (!dev)
502 return -ENODEV;
503 error = __vcc_connect(vcc, dev, vpi, vci);
504 if (error) {
505 atm_dev_put(dev);
506 return error;
1da177e4
LT		 507 }
508 if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC)
a8147d73
JP		 509 set_bit(ATM_VF_PARTIAL, &vcc->flags);
510 if (test_bit(ATM_VF_READY, &ATM_SD(sock)->flags))
1da177e4
LT		 511 sock->state = SS_CONNECTED;
512 return 0;
513}
514
1da177e4
LT		 515int vcc_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
516 size_t size, int flags)
517{
518 struct sock *sk = sock->sk;
519 struct atm_vcc *vcc;
520 struct sk_buff *skb;
521 int copied, error = -EINVAL;
522
523 if (sock->state != SS_CONNECTED)
524 return -ENOTCONN;
40ba8499
JBD		 525
526 /* only handle MSG_DONTWAIT and MSG_PEEK */
527 if (flags & ~(MSG_DONTWAIT | MSG_PEEK))
1da177e4 528 return -EOPNOTSUPP;
40ba8499 529
1da177e4 530 vcc = ATM_SD(sock);
a8147d73
JP		 531 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
532 test_bit(ATM_VF_CLOSE, &vcc->flags) ||
1da177e4
LT		 533 !test_bit(ATM_VF_READY, &vcc->flags))
534 return 0;
535
536 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &error);
537 if (!skb)
538 return error;
539
f7d57453 540 copied = skb->len;
1da177e4 541 if (copied > size) {
f7d57453 542 copied = size;
1da177e4
LT		 543 msg->msg_flags |= MSG_TRUNC;
544 }
545
f7d57453
YH		 546 error = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
547 if (error)
548 return error;
3b885787 549 sock_recv_ts_and_drops(msg, sk, skb);
40ba8499
JBD		 550
551 if (!(flags & MSG_PEEK)) {
552 pr_debug("%d -= %d\n", atomic_read(&sk->sk_rmem_alloc),
553 skb->truesize);
554 atm_return(vcc, skb->truesize);
555 }
556
f7d57453
YH		 557 skb_free_datagram(sk, skb);
558 return copied;
1da177e4
LT		 559}
560
1da177e4
LT		 561int vcc_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
562 size_t total_len)
563{
564 struct sock *sk = sock->sk;
565 DEFINE_WAIT(wait);
566 struct atm_vcc *vcc;
567 struct sk_buff *skb;
a8147d73 568 int eff, error;
1da177e4
LT		 569 const void __user *buff;
570 int size;
571
572 lock_sock(sk);
573 if (sock->state != SS_CONNECTED) {
574 error = -ENOTCONN;
575 goto out;
576 }
577 if (m->msg_name) {
578 error = -EISCONN;
579 goto out;
580 }
581 if (m->msg_iovlen != 1) {
582 error = -ENOSYS; /* fix this later @@@ */
583 goto out;
584 }
585 buff = m->msg_iov->iov_base;
586 size = m->msg_iov->iov_len;
587 vcc = ATM_SD(sock);
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 goto out;
594 }
595 if (!size) {
596 error = 0;
597 goto out;
598 }
599 if (size < 0 || size > vcc->qos.txtp.max_sdu) {
600 error = -EMSGSIZE;
601 goto out;
602 }
e49332bd 603
1da177e4 604 eff = (size+3) & ~3; /* align to word boundary */
aa395145 605 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4 606 error = 0;
a8147d73 607 while (!(skb = alloc_tx(vcc, eff))) {
1da177e4
LT		 608 if (m->msg_flags & MSG_DONTWAIT) {
609 error = -EAGAIN;
610 break;
611 }
612 schedule();
613 if (signal_pending(current)) {
614 error = -ERESTARTSYS;
615 break;
616 }
a8147d73
JP		 617 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
618 test_bit(ATM_VF_CLOSE, &vcc->flags) ||
619 !test_bit(ATM_VF_READY, &vcc->flags)) {
1da177e4
LT		 620 error = -EPIPE;
621 send_sig(SIGPIPE, current, 0);
622 break;
623 }
aa395145 624 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4 625 }
aa395145 626 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 627 if (error)
628 goto out;
629 skb->dev = NULL; /* for paths shared with net_device interfaces */
630 ATM_SKB(skb)->atm_options = vcc->atm_options;
a8147d73 631 if (copy_from_user(skb_put(skb, size), buff, size)) {
1da177e4
LT		 632 kfree_skb(skb);
633 error = -EFAULT;
634 goto out;
635 }
a8147d73
JP		 636 if (eff != size)
637 memset(skb->data + size, 0, eff-size);
638 error = vcc->dev->ops->send(vcc, skb);
1da177e4
LT		 639 error = error ? error : size;
640out:
641 release_sock(sk);
642 return error;
643}
644
1da177e4
LT		 645unsigned int vcc_poll(struct file *file, struct socket *sock, poll_table *wait)
646{
647 struct sock *sk = sock->sk;
648 struct atm_vcc *vcc;
649 unsigned int mask;
650
aa395145 651 sock_poll_wait(file, sk_sleep(sk), wait);
1da177e4
LT		 652 mask = 0;
653
654 vcc = ATM_SD(sock);
655
656 /* exceptional events */
657 if (sk->sk_err)
658 mask = POLLERR;
659
660 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
661 test_bit(ATM_VF_CLOSE, &vcc->flags))
662 mask |= POLLHUP;
663
664 /* readable? */
665 if (!skb_queue_empty(&sk->sk_receive_queue))
666 mask |= POLLIN | POLLRDNORM;
667
668 /* writable? */
669 if (sock->state == SS_CONNECTING &&
670 test_bit(ATM_VF_WAITING, &vcc->flags))
671 return mask;
672
673 if (vcc->qos.txtp.traffic_class != ATM_NONE &&
674 vcc_writable(sk))
675 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
676
677 return mask;
678}
679
a8147d73 680static int atm_change_qos(struct atm_vcc *vcc, struct atm_qos *qos)
1da177e4
LT		 681{
682 int error;
683
684 /*
685 * Don't let the QoS change the already connected AAL type nor the
686 * traffic class.
687 */
688 if (qos->aal != vcc->qos.aal ||
689 qos->rxtp.traffic_class != vcc->qos.rxtp.traffic_class ||
690 qos->txtp.traffic_class != vcc->qos.txtp.traffic_class)
691 return -EINVAL;
a8147d73
JP		 692 error = adjust_tp(&qos->txtp, qos->aal);
693 if (!error)
694 error = adjust_tp(&qos->rxtp, qos->aal);
695 if (error)
696 return error;
697 if (!vcc->dev->ops->change_qos)
698 return -EOPNOTSUPP;
1da177e4 699 if (sk_atm(vcc)->sk_family == AF_ATMPVC)
a8147d73
JP		 700 return vcc->dev->ops->change_qos(vcc, qos, ATM_MF_SET);
701 return svc_change_qos(vcc, qos);
1da177e4
LT		 702}
703
61c33e01 704static int check_tp(const struct atm_trafprm *tp)
1da177e4
LT		 705{
706 /* @@@ Should be merged with adjust_tp */
a8147d73
JP		 707 if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS)
708 return 0;
1da177e4 709 if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr &&
a8147d73
JP		 710 !tp->max_pcr)
711 return -EINVAL;
712 if (tp->min_pcr == ATM_MAX_PCR)
713 return -EINVAL;
1da177e4 714 if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR &&
a8147d73
JP		 715 tp->min_pcr > tp->max_pcr)
716 return -EINVAL;
1da177e4
LT		 717 /*
718 * We allow pcr to be outside [min_pcr,max_pcr], because later
719 * adjustment may still push it in the valid range.
720 */
721 return 0;
722}
723
61c33e01 724static int check_qos(const struct atm_qos *qos)
1da177e4
LT		 725{
726 int error;
727
728 if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class)
f7d57453 729 return -EINVAL;
1da177e4
LT		 730 if (qos->txtp.traffic_class != qos->rxtp.traffic_class &&
731 qos->txtp.traffic_class && qos->rxtp.traffic_class &&
732 qos->txtp.traffic_class != ATM_ANYCLASS &&
a8147d73
JP		 733 qos->rxtp.traffic_class != ATM_ANYCLASS)
734 return -EINVAL;
1da177e4 735 error = check_tp(&qos->txtp);
a8147d73
JP		 736 if (error)
737 return error;
1da177e4
LT		 738 return check_tp(&qos->rxtp);
739}
740
741int vcc_setsockopt(struct socket *sock, int level, int optname,
b7058842 742 char __user *optval, unsigned int optlen)
1da177e4
LT		 743{
744 struct atm_vcc *vcc;
745 unsigned long value;
746 int error;
747
748 if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname))
749 return -EINVAL;
750
751 vcc = ATM_SD(sock);
752 switch (optname) {
a8147d73
JP		 753 case SO_ATMQOS:
754 {
755 struct atm_qos qos;
756
757 if (copy_from_user(&qos, optval, sizeof(qos)))
758 return -EFAULT;
759 error = check_qos(&qos);
760 if (error)
761 return error;
762 if (sock->state == SS_CONNECTED)
763 return atm_change_qos(vcc, &qos);
764 if (sock->state != SS_UNCONNECTED)
765 return -EBADFD;
766 vcc->qos = qos;
767 set_bit(ATM_VF_HASQOS, &vcc->flags);
768 return 0;
1da177e4 769 }
a8147d73
JP		 770 case SO_SETCLP:
771 if (get_user(value, (unsigned long __user *)optval))
772 return -EFAULT;
773 if (value)
774 vcc->atm_options |= ATM_ATMOPT_CLP;
775 else
776 vcc->atm_options &= ~ATM_ATMOPT_CLP;
777 return 0;
778 default:
779 if (level == SOL_SOCKET)
780 return -EINVAL;
781 break;
782 }
783 if (!vcc->dev || !vcc->dev->ops->setsockopt)
784 return -EINVAL;
785 return vcc->dev->ops->setsockopt(vcc, level, optname, optval, optlen);
1da177e4
LT		 786}
787
1da177e4
LT		 788int vcc_getsockopt(struct socket *sock, int level, int optname,
789 char __user *optval, int __user *optlen)
790{
791 struct atm_vcc *vcc;
792 int len;
793
794 if (get_user(len, optlen))
795 return -EFAULT;
796 if (__SO_LEVEL_MATCH(optname, level) && len != __SO_SIZE(optname))
797 return -EINVAL;
798
799 vcc = ATM_SD(sock);
800 switch (optname) {
a8147d73
JP		 801 case SO_ATMQOS:
802 if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
803 return -EINVAL;
804 return copy_to_user(optval, &vcc->qos, sizeof(vcc->qos))
805 ? -EFAULT : 0;
806 case SO_SETCLP:
807 return put_user(vcc->atm_options & ATM_ATMOPT_CLP ? 1 : 0,
808 (unsigned long __user *)optval) ? -EFAULT : 0;
809 case SO_ATMPVC:
810 {
811 struct sockaddr_atmpvc pvc;
812
813 if (!vcc->dev || !test_bit(ATM_VF_ADDR, &vcc->flags))
814 return -ENOTCONN;
815 pvc.sap_family = AF_ATMPVC;
816 pvc.sap_addr.itf = vcc->dev->number;
817 pvc.sap_addr.vpi = vcc->vpi;
818 pvc.sap_addr.vci = vcc->vci;
819 return copy_to_user(optval, &pvc, sizeof(pvc)) ? -EFAULT : 0;
820 }
821 default:
822 if (level == SOL_SOCKET)
823 return -EINVAL;
510a05ed 824 break;
1da177e4 825 }
a8147d73
JP		 826 if (!vcc->dev || !vcc->dev->ops->getsockopt)
827 return -EINVAL;
1da177e4
LT		 828 return vcc->dev->ops->getsockopt(vcc, level, optname, optval, len);
829}
830
7313bb8f
KH		 831int register_atmdevice_notifier(struct notifier_block *nb)
832{
833 return atomic_notifier_chain_register(&atm_dev_notify_chain, nb);
834}
835EXPORT_SYMBOL_GPL(register_atmdevice_notifier);
836
837void unregister_atmdevice_notifier(struct notifier_block *nb)
838{
839 atomic_notifier_chain_unregister(&atm_dev_notify_chain, nb);
840}
841EXPORT_SYMBOL_GPL(unregister_atmdevice_notifier);
842
1da177e4
LT		 843static int __init atm_init(void)
844{
845 int error;
846
a8147d73
JP		 847 error = proto_register(&vcc_proto, 0);
848 if (error < 0)
1da177e4 849 goto out;
a8147d73
JP		 850 error = atmpvc_init();
851 if (error < 0) {
99824461 852 pr_err("atmpvc_init() failed with %d\n", error);
1da177e4
LT		 853 goto out_unregister_vcc_proto;
854 }
a8147d73
JP		 855 error = atmsvc_init();
856 if (error < 0) {
99824461 857 pr_err("atmsvc_init() failed with %d\n", error);
1da177e4
LT		 858 goto out_atmpvc_exit;
859 }
a8147d73
JP		 860 error = atm_proc_init();
861 if (error < 0) {
99824461 862 pr_err("atm_proc_init() failed with %d\n", error);
1da177e4
LT		 863 goto out_atmsvc_exit;
864 }
a8147d73
JP		 865 error = atm_sysfs_init();
866 if (error < 0) {
99824461 867 pr_err("atm_sysfs_init() failed with %d\n", error);
656d98b0
RK		 868 goto out_atmproc_exit;
869 }
1da177e4
LT		 870out:
871 return error;
656d98b0
RK		 872out_atmproc_exit:
873 atm_proc_exit();
1da177e4
LT		 874out_atmsvc_exit:
875 atmsvc_exit();
876out_atmpvc_exit:
877 atmsvc_exit();
878out_unregister_vcc_proto:
879 proto_unregister(&vcc_proto);
880 goto out;
881}
882
883static void __exit atm_exit(void)
884{
885 atm_proc_exit();
656d98b0 886 atm_sysfs_exit();
1da177e4
LT		 887 atmsvc_exit();
888 atmpvc_exit();
889 proto_unregister(&vcc_proto);
890}
891
84ff602e
DW		 892subsys_initcall(atm_init);
893
1da177e4
LT		 894module_exit(atm_exit);
895
896MODULE_LICENSE("GPL");
897MODULE_ALIAS_NETPROTO(PF_ATMPVC);
898MODULE_ALIAS_NETPROTO(PF_ATMSVC);
kernel source for telekom puls (alcatel/mediatek)