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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[deliverable/linux.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];
273 struct hlist_node *node, *tmp;
274 struct sock *s;
275 struct atm_vcc *vcc;
276
277 sk_for_each_safe(s, node, 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}
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 hlist_node *node;
321 struct sock *s;
322 struct atm_vcc *walk;
323
324 sk_for_each(s, node, head) {
325 walk = atm_sk(s);
326 if (walk->dev != vcc->dev)
327 continue;
328 if (test_bit(ATM_VF_ADDR, &walk->flags) && walk->vpi == vpi &&
329 walk->vci == vci && ((walk->qos.txtp.traffic_class !=
330 ATM_NONE && vcc->qos.txtp.traffic_class != ATM_NONE) ||
331 (walk->qos.rxtp.traffic_class != ATM_NONE &&
332 vcc->qos.rxtp.traffic_class != ATM_NONE)))
333 return -EADDRINUSE;
334 }
335
336 /* allow VCCs with same VPI/VCI iff they don't collide on
337 TX/RX (but we may refuse such sharing for other reasons,
338 e.g. if protocol requires to have both channels) */
339
340 return 0;
341}
342
61c33e01 343static int find_ci(const struct atm_vcc *vcc, short *vpi, int *vci)
1da177e4
LT		 344{
345 static short p; /* poor man's per-device cache */
346 static int c;
347 short old_p;
348 int old_c;
349 int err;
350
351 if (*vpi != ATM_VPI_ANY && *vci != ATM_VCI_ANY) {
352 err = check_ci(vcc, *vpi, *vci);
353 return err;
354 }
355 /* last scan may have left values out of bounds for current device */
356 if (*vpi != ATM_VPI_ANY)
357 p = *vpi;
358 else if (p >= 1 << vcc->dev->ci_range.vpi_bits)
359 p = 0;
360 if (*vci != ATM_VCI_ANY)
361 c = *vci;
362 else if (c < ATM_NOT_RSV_VCI || c >= 1 << vcc->dev->ci_range.vci_bits)
363 c = ATM_NOT_RSV_VCI;
364 old_p = p;
365 old_c = c;
366 do {
367 if (!check_ci(vcc, p, c)) {
368 *vpi = p;
369 *vci = c;
370 return 0;
371 }
372 if (*vci == ATM_VCI_ANY) {
373 c++;
374 if (c >= 1 << vcc->dev->ci_range.vci_bits)
375 c = ATM_NOT_RSV_VCI;
376 }
377 if ((c == ATM_NOT_RSV_VCI || *vci != ATM_VCI_ANY) &&
378 *vpi == ATM_VPI_ANY) {
379 p++;
a8147d73
JP		 380 if (p >= 1 << vcc->dev->ci_range.vpi_bits)
381 p = 0;
1da177e4 382 }
a8147d73 383 } while (old_p != p || old_c != c);
1da177e4
LT		 384 return -EADDRINUSE;
385}
386
1da177e4
LT		 387static int __vcc_connect(struct atm_vcc *vcc, struct atm_dev *dev, short vpi,
388 int vci)
389{
390 struct sock *sk = sk_atm(vcc);
391 int error;
392
393 if ((vpi != ATM_VPI_UNSPEC && vpi != ATM_VPI_ANY &&
394 vpi >> dev->ci_range.vpi_bits) || (vci != ATM_VCI_UNSPEC &&
395 vci != ATM_VCI_ANY && vci >> dev->ci_range.vci_bits))
396 return -EINVAL;
397 if (vci > 0 && vci < ATM_NOT_RSV_VCI && !capable(CAP_NET_BIND_SERVICE))
398 return -EPERM;
64bf69dd 399 error = -ENODEV;
1da177e4 400 if (!try_module_get(dev->ops->owner))
64bf69dd 401 return error;
1da177e4
LT		 402 vcc->dev = dev;
403 write_lock_irq(&vcc_sklist_lock);
f7d57453 404 if (test_bit(ATM_DF_REMOVED, &dev->flags) ||
64bf69dd 405 (error = find_ci(vcc, &vpi, &vci))) {
1da177e4
LT		 406 write_unlock_irq(&vcc_sklist_lock);
407 goto fail_module_put;
408 }
409 vcc->vpi = vpi;
410 vcc->vci = vci;
411 __vcc_insert_socket(sk);
412 write_unlock_irq(&vcc_sklist_lock);
413 switch (vcc->qos.aal) {
a8147d73
JP		 414 case ATM_AAL0:
415 error = atm_init_aal0(vcc);
416 vcc->stats = &dev->stats.aal0;
417 break;
418 case ATM_AAL34:
419 error = atm_init_aal34(vcc);
420 vcc->stats = &dev->stats.aal34;
421 break;
422 case ATM_NO_AAL:
423 /* ATM_AAL5 is also used in the "0 for default" case */
424 vcc->qos.aal = ATM_AAL5;
425 /* fall through */
426 case ATM_AAL5:
427 error = atm_init_aal5(vcc);
428 vcc->stats = &dev->stats.aal5;
429 break;
430 default:
431 error = -EPROTOTYPE;
1da177e4 432 }
a8147d73
JP		 433 if (!error)
434 error = adjust_tp(&vcc->qos.txtp, vcc->qos.aal);
435 if (!error)
436 error = adjust_tp(&vcc->qos.rxtp, vcc->qos.aal);
1da177e4
LT		 437 if (error)
438 goto fail;
99824461
JP		 439 pr_debug("VCC %d.%d, AAL %d\n", vpi, vci, vcc->qos.aal);
440 pr_debug(" TX: %d, PCR %d..%d, SDU %d\n",
441 vcc->qos.txtp.traffic_class,
442 vcc->qos.txtp.min_pcr,
443 vcc->qos.txtp.max_pcr,
444 vcc->qos.txtp.max_sdu);
445 pr_debug(" RX: %d, PCR %d..%d, SDU %d\n",
446 vcc->qos.rxtp.traffic_class,
447 vcc->qos.rxtp.min_pcr,
448 vcc->qos.rxtp.max_pcr,
449 vcc->qos.rxtp.max_sdu);
1da177e4
LT		 450
451 if (dev->ops->open) {
a8147d73
JP		 452 error = dev->ops->open(vcc);
453 if (error)
1da177e4
LT		 454 goto fail;
455 }
456 return 0;
457
458fail:
459 vcc_remove_socket(sk);
460fail_module_put:
461 module_put(dev->ops->owner);
462 /* ensure we get dev module ref count correct */
463 vcc->dev = NULL;
464 return error;
465}
466
1da177e4
LT		 467int vcc_connect(struct socket *sock, int itf, short vpi, int vci)
468{
469 struct atm_dev *dev;
470 struct atm_vcc *vcc = ATM_SD(sock);
471 int error;
472
99824461 473 pr_debug("(vpi %d, vci %d)\n", vpi, vci);
1da177e4
LT		 474 if (sock->state == SS_CONNECTED)
475 return -EISCONN;
476 if (sock->state != SS_UNCONNECTED)
477 return -EINVAL;
478 if (!(vpi || vci))
479 return -EINVAL;
480
481 if (vpi != ATM_VPI_UNSPEC && vci != ATM_VCI_UNSPEC)
a8147d73 482 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1da177e4 483 else
a8147d73 484 if (test_bit(ATM_VF_PARTIAL, &vcc->flags))
1da177e4 485 return -EINVAL;
99824461
JP		 486 pr_debug("(TX: cl %d,bw %d-%d,sdu %d; "
487 "RX: cl %d,bw %d-%d,sdu %d,AAL %s%d)\n",
488 vcc->qos.txtp.traffic_class, vcc->qos.txtp.min_pcr,
489 vcc->qos.txtp.max_pcr, vcc->qos.txtp.max_sdu,
490 vcc->qos.rxtp.traffic_class, vcc->qos.rxtp.min_pcr,
a8147d73 491 vcc->qos.rxtp.max_pcr, vcc->qos.rxtp.max_sdu,
99824461
JP		 492 vcc->qos.aal == ATM_AAL5 ? "" :
493 vcc->qos.aal == ATM_AAL0 ? "" : " ??? code ",
494 vcc->qos.aal == ATM_AAL0 ? 0 : vcc->qos.aal);
1da177e4
LT		 495 if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
496 return -EBADFD;
497 if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
498 vcc->qos.rxtp.traffic_class == ATM_ANYCLASS)
499 return -EINVAL;
c9933d08 500 if (likely(itf != ATM_ITF_ANY)) {
a8147d73
JP		 501 dev = try_then_request_module(atm_dev_lookup(itf),
502 "atm-device-%d", itf);
1da177e4 503 } else {
1da177e4 504 dev = NULL;
57b47a53 505 mutex_lock(&atm_dev_mutex);
c9933d08 506 if (!list_empty(&atm_devs)) {
a8147d73
JP		 507 dev = list_entry(atm_devs.next,
508 struct atm_dev, dev_list);
1da177e4 509 atm_dev_hold(dev);
1da177e4 510 }
57b47a53 511 mutex_unlock(&atm_dev_mutex);
c9933d08
MBJ		 512 }
513 if (!dev)
514 return -ENODEV;
515 error = __vcc_connect(vcc, dev, vpi, vci);
516 if (error) {
517 atm_dev_put(dev);
518 return error;
1da177e4
LT		 519 }
520 if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC)
a8147d73
JP		 521 set_bit(ATM_VF_PARTIAL, &vcc->flags);
522 if (test_bit(ATM_VF_READY, &ATM_SD(sock)->flags))
1da177e4
LT		 523 sock->state = SS_CONNECTED;
524 return 0;
525}
526
1da177e4
LT		 527int vcc_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
528 size_t size, int flags)
529{
530 struct sock *sk = sock->sk;
531 struct atm_vcc *vcc;
532 struct sk_buff *skb;
533 int copied, error = -EINVAL;
534
535 if (sock->state != SS_CONNECTED)
536 return -ENOTCONN;
40ba8499
JBD		 537
538 /* only handle MSG_DONTWAIT and MSG_PEEK */
539 if (flags & ~(MSG_DONTWAIT | MSG_PEEK))
1da177e4 540 return -EOPNOTSUPP;
40ba8499 541
1da177e4 542 vcc = ATM_SD(sock);
a8147d73
JP		 543 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
544 test_bit(ATM_VF_CLOSE, &vcc->flags) ||
1da177e4
LT		 545 !test_bit(ATM_VF_READY, &vcc->flags))
546 return 0;
547
548 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &error);
549 if (!skb)
550 return error;
551
f7d57453 552 copied = skb->len;
1da177e4 553 if (copied > size) {
f7d57453 554 copied = size;
1da177e4
LT		 555 msg->msg_flags |= MSG_TRUNC;
556 }
557
f7d57453
YH		 558 error = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
559 if (error)
560 return error;
3b885787 561 sock_recv_ts_and_drops(msg, sk, skb);
40ba8499
JBD		 562
563 if (!(flags & MSG_PEEK)) {
564 pr_debug("%d -= %d\n", atomic_read(&sk->sk_rmem_alloc),
565 skb->truesize);
566 atm_return(vcc, skb->truesize);
567 }
568
f7d57453
YH		 569 skb_free_datagram(sk, skb);
570 return copied;
1da177e4
LT		 571}
572
1da177e4
LT		 573int vcc_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
574 size_t total_len)
575{
576 struct sock *sk = sock->sk;
577 DEFINE_WAIT(wait);
578 struct atm_vcc *vcc;
579 struct sk_buff *skb;
a8147d73 580 int eff, error;
1da177e4
LT		 581 const void __user *buff;
582 int size;
583
584 lock_sock(sk);
585 if (sock->state != SS_CONNECTED) {
586 error = -ENOTCONN;
587 goto out;
588 }
589 if (m->msg_name) {
590 error = -EISCONN;
591 goto out;
592 }
593 if (m->msg_iovlen != 1) {
594 error = -ENOSYS; /* fix this later @@@ */
595 goto out;
596 }
597 buff = m->msg_iov->iov_base;
598 size = m->msg_iov->iov_len;
599 vcc = ATM_SD(sock);
600 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
601 test_bit(ATM_VF_CLOSE, &vcc->flags) ||
602 !test_bit(ATM_VF_READY, &vcc->flags)) {
603 error = -EPIPE;
604 send_sig(SIGPIPE, current, 0);
605 goto out;
606 }
607 if (!size) {
608 error = 0;
609 goto out;
610 }
611 if (size < 0 || size > vcc->qos.txtp.max_sdu) {
612 error = -EMSGSIZE;
613 goto out;
614 }
e49332bd 615
1da177e4 616 eff = (size+3) & ~3; /* align to word boundary */
aa395145 617 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4 618 error = 0;
a8147d73 619 while (!(skb = alloc_tx(vcc, eff))) {
1da177e4
LT		 620 if (m->msg_flags & MSG_DONTWAIT) {
621 error = -EAGAIN;
622 break;
623 }
624 schedule();
625 if (signal_pending(current)) {
626 error = -ERESTARTSYS;
627 break;
628 }
a8147d73
JP		 629 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
630 test_bit(ATM_VF_CLOSE, &vcc->flags) ||
631 !test_bit(ATM_VF_READY, &vcc->flags)) {
1da177e4
LT		 632 error = -EPIPE;
633 send_sig(SIGPIPE, current, 0);
634 break;
635 }
aa395145 636 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4 637 }
aa395145 638 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 639 if (error)
640 goto out;
641 skb->dev = NULL; /* for paths shared with net_device interfaces */
642 ATM_SKB(skb)->atm_options = vcc->atm_options;
a8147d73 643 if (copy_from_user(skb_put(skb, size), buff, size)) {
1da177e4
LT		 644 kfree_skb(skb);
645 error = -EFAULT;
646 goto out;
647 }
a8147d73
JP		 648 if (eff != size)
649 memset(skb->data + size, 0, eff-size);
650 error = vcc->dev->ops->send(vcc, skb);
1da177e4
LT		 651 error = error ? error : size;
652out:
653 release_sock(sk);
654 return error;
655}
656
1da177e4
LT		 657unsigned int vcc_poll(struct file *file, struct socket *sock, poll_table *wait)
658{
659 struct sock *sk = sock->sk;
660 struct atm_vcc *vcc;
661 unsigned int mask;
662
aa395145 663 sock_poll_wait(file, sk_sleep(sk), wait);
1da177e4
LT		 664 mask = 0;
665
666 vcc = ATM_SD(sock);
667
668 /* exceptional events */
669 if (sk->sk_err)
670 mask = POLLERR;
671
672 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
673 test_bit(ATM_VF_CLOSE, &vcc->flags))
674 mask |= POLLHUP;
675
676 /* readable? */
677 if (!skb_queue_empty(&sk->sk_receive_queue))
678 mask |= POLLIN | POLLRDNORM;
679
680 /* writable? */
681 if (sock->state == SS_CONNECTING &&
682 test_bit(ATM_VF_WAITING, &vcc->flags))
683 return mask;
684
685 if (vcc->qos.txtp.traffic_class != ATM_NONE &&
686 vcc_writable(sk))
687 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
688
689 return mask;
690}
691
a8147d73 692static int atm_change_qos(struct atm_vcc *vcc, struct atm_qos *qos)
1da177e4
LT		 693{
694 int error;
695
696 /*
697 * Don't let the QoS change the already connected AAL type nor the
698 * traffic class.
699 */
700 if (qos->aal != vcc->qos.aal ||
701 qos->rxtp.traffic_class != vcc->qos.rxtp.traffic_class ||
702 qos->txtp.traffic_class != vcc->qos.txtp.traffic_class)
703 return -EINVAL;
a8147d73
JP		 704 error = adjust_tp(&qos->txtp, qos->aal);
705 if (!error)
706 error = adjust_tp(&qos->rxtp, qos->aal);
707 if (error)
708 return error;
709 if (!vcc->dev->ops->change_qos)
710 return -EOPNOTSUPP;
1da177e4 711 if (sk_atm(vcc)->sk_family == AF_ATMPVC)
a8147d73
JP		 712 return vcc->dev->ops->change_qos(vcc, qos, ATM_MF_SET);
713 return svc_change_qos(vcc, qos);
1da177e4
LT		 714}
715
61c33e01 716static int check_tp(const struct atm_trafprm *tp)
1da177e4
LT		 717{
718 /* @@@ Should be merged with adjust_tp */
a8147d73
JP		 719 if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS)
720 return 0;
1da177e4 721 if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr &&
a8147d73
JP		 722 !tp->max_pcr)
723 return -EINVAL;
724 if (tp->min_pcr == ATM_MAX_PCR)
725 return -EINVAL;
1da177e4 726 if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR &&
a8147d73
JP		 727 tp->min_pcr > tp->max_pcr)
728 return -EINVAL;
1da177e4
LT		 729 /*
730 * We allow pcr to be outside [min_pcr,max_pcr], because later
731 * adjustment may still push it in the valid range.
732 */
733 return 0;
734}
735
61c33e01 736static int check_qos(const struct atm_qos *qos)
1da177e4
LT		 737{
738 int error;
739
740 if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class)
f7d57453 741 return -EINVAL;
1da177e4
LT		 742 if (qos->txtp.traffic_class != qos->rxtp.traffic_class &&
743 qos->txtp.traffic_class && qos->rxtp.traffic_class &&
744 qos->txtp.traffic_class != ATM_ANYCLASS &&
a8147d73
JP		 745 qos->rxtp.traffic_class != ATM_ANYCLASS)
746 return -EINVAL;
1da177e4 747 error = check_tp(&qos->txtp);
a8147d73
JP		 748 if (error)
749 return error;
1da177e4
LT		 750 return check_tp(&qos->rxtp);
751}
752
753int vcc_setsockopt(struct socket *sock, int level, int optname,
b7058842 754 char __user *optval, unsigned int optlen)
1da177e4
LT		 755{
756 struct atm_vcc *vcc;
757 unsigned long value;
758 int error;
759
760 if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname))
761 return -EINVAL;
762
763 vcc = ATM_SD(sock);
764 switch (optname) {
a8147d73
JP		 765 case SO_ATMQOS:
766 {
767 struct atm_qos qos;
768
769 if (copy_from_user(&qos, optval, sizeof(qos)))
770 return -EFAULT;
771 error = check_qos(&qos);
772 if (error)
773 return error;
774 if (sock->state == SS_CONNECTED)
775 return atm_change_qos(vcc, &qos);
776 if (sock->state != SS_UNCONNECTED)
777 return -EBADFD;
778 vcc->qos = qos;
779 set_bit(ATM_VF_HASQOS, &vcc->flags);
780 return 0;
1da177e4 781 }
a8147d73
JP		 782 case SO_SETCLP:
783 if (get_user(value, (unsigned long __user *)optval))
784 return -EFAULT;
785 if (value)
786 vcc->atm_options |= ATM_ATMOPT_CLP;
787 else
788 vcc->atm_options &= ~ATM_ATMOPT_CLP;
789 return 0;
790 default:
791 if (level == SOL_SOCKET)
792 return -EINVAL;
793 break;
794 }
795 if (!vcc->dev || !vcc->dev->ops->setsockopt)
796 return -EINVAL;
797 return vcc->dev->ops->setsockopt(vcc, level, optname, optval, optlen);
1da177e4
LT		 798}
799
1da177e4
LT		 800int vcc_getsockopt(struct socket *sock, int level, int optname,
801 char __user *optval, int __user *optlen)
802{
803 struct atm_vcc *vcc;
804 int len;
805
806 if (get_user(len, optlen))
807 return -EFAULT;
808 if (__SO_LEVEL_MATCH(optname, level) && len != __SO_SIZE(optname))
809 return -EINVAL;
810
811 vcc = ATM_SD(sock);
812 switch (optname) {
a8147d73
JP		 813 case SO_ATMQOS:
814 if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
815 return -EINVAL;
816 return copy_to_user(optval, &vcc->qos, sizeof(vcc->qos))
817 ? -EFAULT : 0;
818 case SO_SETCLP:
819 return put_user(vcc->atm_options & ATM_ATMOPT_CLP ? 1 : 0,
820 (unsigned long __user *)optval) ? -EFAULT : 0;
821 case SO_ATMPVC:
822 {
823 struct sockaddr_atmpvc pvc;
824
825 if (!vcc->dev || !test_bit(ATM_VF_ADDR, &vcc->flags))
826 return -ENOTCONN;
e862f1a9 827 memset(&pvc, 0, sizeof(pvc));
a8147d73
JP		 828 pvc.sap_family = AF_ATMPVC;
829 pvc.sap_addr.itf = vcc->dev->number;
830 pvc.sap_addr.vpi = vcc->vpi;
831 pvc.sap_addr.vci = vcc->vci;
832 return copy_to_user(optval, &pvc, sizeof(pvc)) ? -EFAULT : 0;
833 }
834 default:
835 if (level == SOL_SOCKET)
836 return -EINVAL;
510a05ed 837 break;
1da177e4 838 }
a8147d73
JP		 839 if (!vcc->dev || !vcc->dev->ops->getsockopt)
840 return -EINVAL;
1da177e4
LT		 841 return vcc->dev->ops->getsockopt(vcc, level, optname, optval, len);
842}
843
7313bb8f
KH		 844int register_atmdevice_notifier(struct notifier_block *nb)
845{
846 return atomic_notifier_chain_register(&atm_dev_notify_chain, nb);
847}
848EXPORT_SYMBOL_GPL(register_atmdevice_notifier);
849
850void unregister_atmdevice_notifier(struct notifier_block *nb)
851{
852 atomic_notifier_chain_unregister(&atm_dev_notify_chain, nb);
853}
854EXPORT_SYMBOL_GPL(unregister_atmdevice_notifier);
855
1da177e4
LT		 856static int __init atm_init(void)
857{
858 int error;
859
a8147d73
JP		 860 error = proto_register(&vcc_proto, 0);
861 if (error < 0)
1da177e4 862 goto out;
a8147d73
JP		 863 error = atmpvc_init();
864 if (error < 0) {
99824461 865 pr_err("atmpvc_init() failed with %d\n", error);
1da177e4
LT		 866 goto out_unregister_vcc_proto;
867 }
a8147d73
JP		 868 error = atmsvc_init();
869 if (error < 0) {
99824461 870 pr_err("atmsvc_init() failed with %d\n", error);
1da177e4
LT		 871 goto out_atmpvc_exit;
872 }
a8147d73
JP		 873 error = atm_proc_init();
874 if (error < 0) {
99824461 875 pr_err("atm_proc_init() failed with %d\n", error);
1da177e4
LT		 876 goto out_atmsvc_exit;
877 }
a8147d73
JP		 878 error = atm_sysfs_init();
879 if (error < 0) {
99824461 880 pr_err("atm_sysfs_init() failed with %d\n", error);
656d98b0
RK		 881 goto out_atmproc_exit;
882 }
1da177e4
LT		 883out:
884 return error;
656d98b0
RK		 885out_atmproc_exit:
886 atm_proc_exit();
1da177e4
LT		 887out_atmsvc_exit:
888 atmsvc_exit();
889out_atmpvc_exit:
890 atmsvc_exit();
891out_unregister_vcc_proto:
892 proto_unregister(&vcc_proto);
893 goto out;
894}
895
896static void __exit atm_exit(void)
897{
898 atm_proc_exit();
656d98b0 899 atm_sysfs_exit();
1da177e4
LT		 900 atmsvc_exit();
901 atmpvc_exit();
902 proto_unregister(&vcc_proto);
903}
904
84ff602e
DW		 905subsys_initcall(atm_init);
906
1da177e4
LT		 907module_exit(atm_exit);
908
909MODULE_LICENSE("GPL");
910MODULE_ALIAS_NETPROTO(PF_ATMPVC);
911MODULE_ALIAS_NETPROTO(PF_ATMSVC);
Linux kernel - Deliverables
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