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Merge tag 'please-pull-pstore' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl...
[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
c971f08c
DW		 129static 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
1da177e4
LT		 137static struct proto vcc_proto = {
138 .name = "VCC",
139 .owner = THIS_MODULE,
140 .obj_size = sizeof(struct atm_vcc),
c971f08c 141 .release_cb = vcc_release_cb,
1da177e4 142};
f7d57453 143
1b8d7ae4 144int vcc_create(struct net *net, struct socket *sock, int protocol, int family)
1da177e4
LT		 145{
146 struct sock *sk;
147 struct atm_vcc *vcc;
148
149 sock->sk = NULL;
150 if (sock->type == SOCK_STREAM)
151 return -EINVAL;
6257ff21 152 sk = sk_alloc(net, family, GFP_KERNEL, &vcc_proto);
1da177e4
LT		 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;
a8147d73
JP		 161 memset(&vcc->local, 0, sizeof(struct sockaddr_atmsvc));
162 memset(&vcc->remote, 0, sizeof(struct sockaddr_atmsvc));
1da177e4 163 vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */
81e2a3d5 164 atomic_set(&sk->sk_wmem_alloc, 1);
1da177e4
LT		 165 atomic_set(&sk->sk_rmem_alloc, 0);
166 vcc->push = NULL;
167 vcc->pop = NULL;
ec809bd8 168 vcc->owner = NULL;
1da177e4 169 vcc->push_oam = NULL;
c971f08c 170 vcc->release_cb = NULL;
1da177e4
LT		 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
1da177e4
LT		 177static 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 */
ec809bd8 189 module_put(vcc->owner);
1da177e4 190
1da177e4 191 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
a8147d73 192 atm_return(vcc, skb->truesize);
1da177e4
LT		 193 kfree_skb(skb);
194 }
195
196 module_put(vcc->dev->ops->owner);
197 atm_dev_put(vcc->dev);
198 }
9301e320
CW		 199
200 vcc_remove_socket(sk);
1da177e4
LT		 201}
202
1da177e4
LT		 203int 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
1da177e4
LT		 217void 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}
1da177e4
LT		 227EXPORT_SYMBOL(vcc_release_async);
228
4e55f578
JBD		 229void 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}
247EXPORT_SYMBOL(vcc_process_recv_queue);
248
7313bb8f
KH		 249void 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}
264EXPORT_SYMBOL(atm_dev_signal_change);
1da177e4 265
64bf69dd
SG		 266void 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];
b67bfe0d 273 struct hlist_node *tmp;
64bf69dd
SG		 274 struct sock *s;
275 struct atm_vcc *vcc;
276
b67bfe0d 277 sk_for_each_safe(s, tmp, head) {
64bf69dd
SG		 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}
c031235b 287EXPORT_SYMBOL(atm_dev_release_vccs);
64bf69dd 288
a8147d73 289static int adjust_tp(struct atm_trafprm *tp, unsigned char aal)
1da177e4
LT		 290{
291 int max_sdu;
292
a8147d73
JP		 293 if (!tp->traffic_class)
294 return 0;
1da177e4 295 switch (aal) {
a8147d73
JP		 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;
1da177e4 307 }
a8147d73
JP		 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;
1da177e4
LT		 314 return 0;
315}
316
61c33e01 317static int check_ci(const struct atm_vcc *vcc, short vpi, int vci)
1da177e4 318{
a8147d73 319 struct hlist_head *head = &vcc_hash[vci & (VCC_HTABLE_SIZE - 1)];
1da177e4
LT		 320 struct sock *s;
321 struct atm_vcc *walk;
322
b67bfe0d 323 sk_for_each(s, head) {
1da177e4
LT		 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
61c33e01 342static int find_ci(const struct atm_vcc *vcc, short *vpi, int *vci)
1da177e4
LT		 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++;
a8147d73
JP		 379 if (p >= 1 << vcc->dev->ci_range.vpi_bits)
380 p = 0;
1da177e4 381 }
a8147d73 382 } while (old_p != p || old_c != c);
1da177e4
LT		 383 return -EADDRINUSE;
384}
385
1da177e4
LT		 386static 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;
64bf69dd 398 error = -ENODEV;
1da177e4 399 if (!try_module_get(dev->ops->owner))
64bf69dd 400 return error;
1da177e4
LT		 401 vcc->dev = dev;
402 write_lock_irq(&vcc_sklist_lock);
f7d57453 403 if (test_bit(ATM_DF_REMOVED, &dev->flags) ||
64bf69dd 404 (error = find_ci(vcc, &vpi, &vci))) {
1da177e4
LT		 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) {
a8147d73
JP		 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;
1da177e4 431 }
a8147d73
JP		 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);
1da177e4
LT		 436 if (error)
437 goto fail;
99824461
JP		 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);
1da177e4
LT		 449
450 if (dev->ops->open) {
a8147d73
JP		 451 error = dev->ops->open(vcc);
452 if (error)
1da177e4
LT		 453 goto fail;
454 }
455 return 0;
456
457fail:
458 vcc_remove_socket(sk);
459fail_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
1da177e4
LT		 466int 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
99824461 472 pr_debug("(vpi %d, vci %d)\n", vpi, vci);
1da177e4
LT		 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)
a8147d73 481 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1da177e4 482 else
a8147d73 483 if (test_bit(ATM_VF_PARTIAL, &vcc->flags))
1da177e4 484 return -EINVAL;
99824461
JP		 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,
a8147d73 490 vcc->qos.rxtp.max_pcr, vcc->qos.rxtp.max_sdu,
99824461
JP		 491 vcc->qos.aal == ATM_AAL5 ? "" :
492 vcc->qos.aal == ATM_AAL0 ? "" : " ??? code ",
493 vcc->qos.aal == ATM_AAL0 ? 0 : vcc->qos.aal);
1da177e4
LT		 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;
c9933d08 499 if (likely(itf != ATM_ITF_ANY)) {
a8147d73
JP		 500 dev = try_then_request_module(atm_dev_lookup(itf),
501 "atm-device-%d", itf);
1da177e4 502 } else {
1da177e4 503 dev = NULL;
57b47a53 504 mutex_lock(&atm_dev_mutex);
c9933d08 505 if (!list_empty(&atm_devs)) {
a8147d73
JP		 506 dev = list_entry(atm_devs.next,
507 struct atm_dev, dev_list);
1da177e4 508 atm_dev_hold(dev);
1da177e4 509 }
57b47a53 510 mutex_unlock(&atm_dev_mutex);
c9933d08
MBJ		 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;
1da177e4
LT		 518 }
519 if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC)
a8147d73
JP		 520 set_bit(ATM_VF_PARTIAL, &vcc->flags);
521 if (test_bit(ATM_VF_READY, &ATM_SD(sock)->flags))
1da177e4
LT		 522 sock->state = SS_CONNECTED;
523 return 0;
524}
525
1da177e4
LT		 526int 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
9b3e617f
MK		 534 msg->msg_namelen = 0;
535
1da177e4
LT		 536 if (sock->state != SS_CONNECTED)
537 return -ENOTCONN;
40ba8499
JBD		 538
539 /* only handle MSG_DONTWAIT and MSG_PEEK */
540 if (flags & ~(MSG_DONTWAIT | MSG_PEEK))
1da177e4 541 return -EOPNOTSUPP;
40ba8499 542
1da177e4 543 vcc = ATM_SD(sock);
a8147d73
JP		 544 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
545 test_bit(ATM_VF_CLOSE, &vcc->flags) ||
1da177e4
LT		 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
f7d57453 553 copied = skb->len;
1da177e4 554 if (copied > size) {
f7d57453 555 copied = size;
1da177e4
LT		 556 msg->msg_flags |= MSG_TRUNC;
557 }
558
f7d57453
YH		 559 error = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
560 if (error)
561 return error;
3b885787 562 sock_recv_ts_and_drops(msg, sk, skb);
40ba8499
JBD		 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
f7d57453
YH		 570 skb_free_datagram(sk, skb);
571 return copied;
1da177e4
LT		 572}
573
1da177e4
LT		 574int 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;
a8147d73 581 int eff, error;
1da177e4
LT		 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 }
e49332bd 616
1da177e4 617 eff = (size+3) & ~3; /* align to word boundary */
aa395145 618 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4 619 error = 0;
a8147d73 620 while (!(skb = alloc_tx(vcc, eff))) {
1da177e4
LT		 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 }
a8147d73
JP		 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)) {
1da177e4
LT		 633 error = -EPIPE;
634 send_sig(SIGPIPE, current, 0);
635 break;
636 }
aa395145 637 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4 638 }
aa395145 639 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 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;
a8147d73 644 if (copy_from_user(skb_put(skb, size), buff, size)) {
1da177e4
LT		 645 kfree_skb(skb);
646 error = -EFAULT;
647 goto out;
648 }
a8147d73
JP		 649 if (eff != size)
650 memset(skb->data + size, 0, eff-size);
651 error = vcc->dev->ops->send(vcc, skb);
1da177e4
LT		 652 error = error ? error : size;
653out:
654 release_sock(sk);
655 return error;
656}
657
1da177e4
LT		 658unsigned 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
aa395145 664 sock_poll_wait(file, sk_sleep(sk), wait);
1da177e4
LT		 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
a8147d73 693static int atm_change_qos(struct atm_vcc *vcc, struct atm_qos *qos)
1da177e4
LT		 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;
a8147d73
JP		 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;
1da177e4 712 if (sk_atm(vcc)->sk_family == AF_ATMPVC)
a8147d73
JP		 713 return vcc->dev->ops->change_qos(vcc, qos, ATM_MF_SET);
714 return svc_change_qos(vcc, qos);
1da177e4
LT		 715}
716
61c33e01 717static int check_tp(const struct atm_trafprm *tp)
1da177e4
LT		 718{
719 /* @@@ Should be merged with adjust_tp */
a8147d73
JP		 720 if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS)
721 return 0;
1da177e4 722 if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr &&
a8147d73
JP		 723 !tp->max_pcr)
724 return -EINVAL;
725 if (tp->min_pcr == ATM_MAX_PCR)
726 return -EINVAL;
1da177e4 727 if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR &&
a8147d73
JP		 728 tp->min_pcr > tp->max_pcr)
729 return -EINVAL;
1da177e4
LT		 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
61c33e01 737static int check_qos(const struct atm_qos *qos)
1da177e4
LT		 738{
739 int error;
740
741 if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class)
f7d57453 742 return -EINVAL;
1da177e4
LT		 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 &&
a8147d73
JP		 746 qos->rxtp.traffic_class != ATM_ANYCLASS)
747 return -EINVAL;
1da177e4 748 error = check_tp(&qos->txtp);
a8147d73
JP		 749 if (error)
750 return error;
1da177e4
LT		 751 return check_tp(&qos->rxtp);
752}
753
754int vcc_setsockopt(struct socket *sock, int level, int optname,
b7058842 755 char __user *optval, unsigned int optlen)
1da177e4
LT		 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) {
a8147d73
JP		 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;
1da177e4 782 }
a8147d73
JP		 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);
1da177e4
LT		 799}
800
1da177e4
LT		 801int 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) {
a8147d73
JP		 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;
e862f1a9 828 memset(&pvc, 0, sizeof(pvc));
a8147d73
JP		 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;
510a05ed 838 break;
1da177e4 839 }
a8147d73
JP		 840 if (!vcc->dev || !vcc->dev->ops->getsockopt)
841 return -EINVAL;
1da177e4
LT		 842 return vcc->dev->ops->getsockopt(vcc, level, optname, optval, len);
843}
844
7313bb8f
KH		 845int register_atmdevice_notifier(struct notifier_block *nb)
846{
847 return atomic_notifier_chain_register(&atm_dev_notify_chain, nb);
848}
849EXPORT_SYMBOL_GPL(register_atmdevice_notifier);
850
851void unregister_atmdevice_notifier(struct notifier_block *nb)
852{
853 atomic_notifier_chain_unregister(&atm_dev_notify_chain, nb);
854}
855EXPORT_SYMBOL_GPL(unregister_atmdevice_notifier);
856
1da177e4
LT		 857static int __init atm_init(void)
858{
859 int error;
860
a8147d73
JP		 861 error = proto_register(&vcc_proto, 0);
862 if (error < 0)
1da177e4 863 goto out;
a8147d73
JP		 864 error = atmpvc_init();
865 if (error < 0) {
99824461 866 pr_err("atmpvc_init() failed with %d\n", error);
1da177e4
LT		 867 goto out_unregister_vcc_proto;
868 }
a8147d73
JP		 869 error = atmsvc_init();
870 if (error < 0) {
99824461 871 pr_err("atmsvc_init() failed with %d\n", error);
1da177e4
LT		 872 goto out_atmpvc_exit;
873 }
a8147d73
JP		 874 error = atm_proc_init();
875 if (error < 0) {
99824461 876 pr_err("atm_proc_init() failed with %d\n", error);
1da177e4
LT		 877 goto out_atmsvc_exit;
878 }
a8147d73
JP		 879 error = atm_sysfs_init();
880 if (error < 0) {
99824461 881 pr_err("atm_sysfs_init() failed with %d\n", error);
656d98b0
RK		 882 goto out_atmproc_exit;
883 }
1da177e4
LT		 884out:
885 return error;
656d98b0
RK		 886out_atmproc_exit:
887 atm_proc_exit();
1da177e4
LT		 888out_atmsvc_exit:
889 atmsvc_exit();
890out_atmpvc_exit:
891 atmsvc_exit();
892out_unregister_vcc_proto:
893 proto_unregister(&vcc_proto);
894 goto out;
895}
896
897static void __exit atm_exit(void)
898{
899 atm_proc_exit();
656d98b0 900 atm_sysfs_exit();
1da177e4
LT		 901 atmsvc_exit();
902 atmpvc_exit();
903 proto_unregister(&vcc_proto);
904}
905
84ff602e
DW		 906subsys_initcall(atm_init);
907
1da177e4
LT		 908module_exit(atm_exit);
909
910MODULE_LICENSE("GPL");
911MODULE_ALIAS_NETPROTO(PF_ATMPVC);
912MODULE_ALIAS_NETPROTO(PF_ATMSVC);
kernel source for telekom puls (alcatel/mediatek)