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
__vcc_insert_socket(struct sock * sk)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
vcc_insert_socket(struct sock * sk)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
vcc_remove_socket(struct sock * sk)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
alloc_tx(struct atm_vcc * vcc,unsigned int size)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
vcc_sock_destruct(struct sock * sk)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
vcc_def_wakeup(struct sock * sk)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
vcc_writable(struct sock * sk)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
vcc_write_space(struct sock * sk)112 static void vcc_write_space(struct sock *sk)
113 {
114 struct socket_wq *wq;
115
116 rcu_read_lock();
117
118 if (vcc_writable(sk)) {
119 wq = rcu_dereference(sk->sk_wq);
120 if (wq_has_sleeper(wq))
121 wake_up_interruptible(&wq->wait);
122
123 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
124 }
125
126 rcu_read_unlock();
127 }
128
129 static struct proto vcc_proto = {
130 .name = "VCC",
131 .owner = THIS_MODULE,
132 .obj_size = sizeof(struct atm_vcc),
133 };
134
vcc_create(struct net * net,struct socket * sock,int protocol,int family)135 int vcc_create(struct net *net, struct socket *sock, int protocol, int family)
136 {
137 struct sock *sk;
138 struct atm_vcc *vcc;
139
140 sock->sk = NULL;
141 if (sock->type == SOCK_STREAM)
142 return -EINVAL;
143 sk = sk_alloc(net, family, GFP_KERNEL, &vcc_proto);
144 if (!sk)
145 return -ENOMEM;
146 sock_init_data(sock, sk);
147 sk->sk_state_change = vcc_def_wakeup;
148 sk->sk_write_space = vcc_write_space;
149
150 vcc = atm_sk(sk);
151 vcc->dev = NULL;
152 memset(&vcc->local, 0, sizeof(struct sockaddr_atmsvc));
153 memset(&vcc->remote, 0, sizeof(struct sockaddr_atmsvc));
154 vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */
155 atomic_set(&sk->sk_wmem_alloc, 1);
156 atomic_set(&sk->sk_rmem_alloc, 0);
157 vcc->push = NULL;
158 vcc->pop = NULL;
159 vcc->push_oam = NULL;
160 vcc->vpi = vcc->vci = 0; /* no VCI/VPI yet */
161 vcc->atm_options = vcc->aal_options = 0;
162 sk->sk_destruct = vcc_sock_destruct;
163 return 0;
164 }
165
vcc_destroy_socket(struct sock * sk)166 static void vcc_destroy_socket(struct sock *sk)
167 {
168 struct atm_vcc *vcc = atm_sk(sk);
169 struct sk_buff *skb;
170
171 set_bit(ATM_VF_CLOSE, &vcc->flags);
172 clear_bit(ATM_VF_READY, &vcc->flags);
173 if (vcc->dev) {
174 if (vcc->dev->ops->close)
175 vcc->dev->ops->close(vcc);
176 if (vcc->push)
177 vcc->push(vcc, NULL); /* atmarpd has no push */
178
179 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
180 atm_return(vcc, skb->truesize);
181 kfree_skb(skb);
182 }
183
184 module_put(vcc->dev->ops->owner);
185 atm_dev_put(vcc->dev);
186 }
187
188 vcc_remove_socket(sk);
189 }
190
vcc_release(struct socket * sock)191 int vcc_release(struct socket *sock)
192 {
193 struct sock *sk = sock->sk;
194
195 if (sk) {
196 lock_sock(sk);
197 vcc_destroy_socket(sock->sk);
198 release_sock(sk);
199 sock_put(sk);
200 }
201
202 return 0;
203 }
204
vcc_release_async(struct atm_vcc * vcc,int reply)205 void vcc_release_async(struct atm_vcc *vcc, int reply)
206 {
207 struct sock *sk = sk_atm(vcc);
208
209 set_bit(ATM_VF_CLOSE, &vcc->flags);
210 sk->sk_shutdown |= RCV_SHUTDOWN;
211 sk->sk_err = -reply;
212 clear_bit(ATM_VF_WAITING, &vcc->flags);
213 sk->sk_state_change(sk);
214 }
215 EXPORT_SYMBOL(vcc_release_async);
216
vcc_process_recv_queue(struct atm_vcc * vcc)217 void 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 }
235 EXPORT_SYMBOL(vcc_process_recv_queue);
236
atm_dev_signal_change(struct atm_dev * dev,char signal)237 void 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 }
252 EXPORT_SYMBOL(atm_dev_signal_change);
253
atm_dev_release_vccs(struct atm_dev * dev)254 void 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 }
275 EXPORT_SYMBOL(atm_dev_release_vccs);
276
adjust_tp(struct atm_trafprm * tp,unsigned char aal)277 static int adjust_tp(struct atm_trafprm *tp, unsigned char aal)
278 {
279 int max_sdu;
280
281 if (!tp->traffic_class)
282 return 0;
283 switch (aal) {
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;
295 }
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;
302 return 0;
303 }
304
check_ci(const struct atm_vcc * vcc,short vpi,int vci)305 static int check_ci(const struct atm_vcc *vcc, short vpi, int vci)
306 {
307 struct hlist_head *head = &vcc_hash[vci & (VCC_HTABLE_SIZE - 1)];
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
find_ci(const struct atm_vcc * vcc,short * vpi,int * vci)331 static int find_ci(const struct atm_vcc *vcc, short *vpi, int *vci)
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++;
368 if (p >= 1 << vcc->dev->ci_range.vpi_bits)
369 p = 0;
370 }
371 } while (old_p != p || old_c != c);
372 return -EADDRINUSE;
373 }
374
__vcc_connect(struct atm_vcc * vcc,struct atm_dev * dev,short vpi,int vci)375 static 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;
387 error = -ENODEV;
388 if (!try_module_get(dev->ops->owner))
389 return error;
390 vcc->dev = dev;
391 write_lock_irq(&vcc_sklist_lock);
392 if (test_bit(ATM_DF_REMOVED, &dev->flags) ||
393 (error = find_ci(vcc, &vpi, &vci))) {
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) {
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;
420 }
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);
425 if (error)
426 goto fail;
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);
438
439 if (dev->ops->open) {
440 error = dev->ops->open(vcc);
441 if (error)
442 goto fail;
443 }
444 return 0;
445
446 fail:
447 vcc_remove_socket(sk);
448 fail_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
vcc_connect(struct socket * sock,int itf,short vpi,int vci)455 int 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
461 pr_debug("(vpi %d, vci %d)\n", vpi, vci);
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)
470 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
471 else
472 if (test_bit(ATM_VF_PARTIAL, &vcc->flags))
473 return -EINVAL;
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,
479 vcc->qos.rxtp.max_pcr, vcc->qos.rxtp.max_sdu,
480 vcc->qos.aal == ATM_AAL5 ? "" :
481 vcc->qos.aal == ATM_AAL0 ? "" : " ??? code ",
482 vcc->qos.aal == ATM_AAL0 ? 0 : vcc->qos.aal);
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;
488 if (likely(itf != ATM_ITF_ANY)) {
489 dev = try_then_request_module(atm_dev_lookup(itf),
490 "atm-device-%d", itf);
491 } else {
492 dev = NULL;
493 mutex_lock(&atm_dev_mutex);
494 if (!list_empty(&atm_devs)) {
495 dev = list_entry(atm_devs.next,
496 struct atm_dev, dev_list);
497 atm_dev_hold(dev);
498 }
499 mutex_unlock(&atm_dev_mutex);
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;
507 }
508 if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC)
509 set_bit(ATM_VF_PARTIAL, &vcc->flags);
510 if (test_bit(ATM_VF_READY, &ATM_SD(sock)->flags))
511 sock->state = SS_CONNECTED;
512 return 0;
513 }
514
vcc_recvmsg(struct kiocb * iocb,struct socket * sock,struct msghdr * msg,size_t size,int flags)515 int 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;
525
526 /* only handle MSG_DONTWAIT and MSG_PEEK */
527 if (flags & ~(MSG_DONTWAIT | MSG_PEEK))
528 return -EOPNOTSUPP;
529
530 vcc = ATM_SD(sock);
531 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
532 test_bit(ATM_VF_CLOSE, &vcc->flags) ||
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
540 copied = skb->len;
541 if (copied > size) {
542 copied = size;
543 msg->msg_flags |= MSG_TRUNC;
544 }
545
546 error = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
547 if (error)
548 return error;
549 sock_recv_ts_and_drops(msg, sk, skb);
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
557 skb_free_datagram(sk, skb);
558 return copied;
559 }
560
vcc_sendmsg(struct kiocb * iocb,struct socket * sock,struct msghdr * m,size_t total_len)561 int 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;
568 int eff, error;
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 }
603
604 eff = (size+3) & ~3; /* align to word boundary */
605 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
606 error = 0;
607 while (!(skb = alloc_tx(vcc, eff))) {
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 }
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)) {
620 error = -EPIPE;
621 send_sig(SIGPIPE, current, 0);
622 break;
623 }
624 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
625 }
626 finish_wait(sk_sleep(sk), &wait);
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;
631 if (copy_from_user(skb_put(skb, size), buff, size)) {
632 kfree_skb(skb);
633 error = -EFAULT;
634 goto out;
635 }
636 if (eff != size)
637 memset(skb->data + size, 0, eff-size);
638 error = vcc->dev->ops->send(vcc, skb);
639 error = error ? error : size;
640 out:
641 release_sock(sk);
642 return error;
643 }
644
vcc_poll(struct file * file,struct socket * sock,poll_table * wait)645 unsigned 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
651 sock_poll_wait(file, sk_sleep(sk), wait);
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
atm_change_qos(struct atm_vcc * vcc,struct atm_qos * qos)680 static int atm_change_qos(struct atm_vcc *vcc, struct atm_qos *qos)
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;
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;
699 if (sk_atm(vcc)->sk_family == AF_ATMPVC)
700 return vcc->dev->ops->change_qos(vcc, qos, ATM_MF_SET);
701 return svc_change_qos(vcc, qos);
702 }
703
check_tp(const struct atm_trafprm * tp)704 static int check_tp(const struct atm_trafprm *tp)
705 {
706 /* @@@ Should be merged with adjust_tp */
707 if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS)
708 return 0;
709 if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr &&
710 !tp->max_pcr)
711 return -EINVAL;
712 if (tp->min_pcr == ATM_MAX_PCR)
713 return -EINVAL;
714 if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR &&
715 tp->min_pcr > tp->max_pcr)
716 return -EINVAL;
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
check_qos(const struct atm_qos * qos)724 static int check_qos(const struct atm_qos *qos)
725 {
726 int error;
727
728 if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class)
729 return -EINVAL;
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 &&
733 qos->rxtp.traffic_class != ATM_ANYCLASS)
734 return -EINVAL;
735 error = check_tp(&qos->txtp);
736 if (error)
737 return error;
738 return check_tp(&qos->rxtp);
739 }
740
vcc_setsockopt(struct socket * sock,int level,int optname,char __user * optval,unsigned int optlen)741 int vcc_setsockopt(struct socket *sock, int level, int optname,
742 char __user *optval, unsigned int optlen)
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) {
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;
769 }
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);
786 }
787
vcc_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)788 int 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) {
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 memset(&pvc, 0, sizeof(pvc));
816 pvc.sap_family = AF_ATMPVC;
817 pvc.sap_addr.itf = vcc->dev->number;
818 pvc.sap_addr.vpi = vcc->vpi;
819 pvc.sap_addr.vci = vcc->vci;
820 return copy_to_user(optval, &pvc, sizeof(pvc)) ? -EFAULT : 0;
821 }
822 default:
823 if (level == SOL_SOCKET)
824 return -EINVAL;
825 break;
826 }
827 if (!vcc->dev || !vcc->dev->ops->getsockopt)
828 return -EINVAL;
829 return vcc->dev->ops->getsockopt(vcc, level, optname, optval, len);
830 }
831
register_atmdevice_notifier(struct notifier_block * nb)832 int register_atmdevice_notifier(struct notifier_block *nb)
833 {
834 return atomic_notifier_chain_register(&atm_dev_notify_chain, nb);
835 }
836 EXPORT_SYMBOL_GPL(register_atmdevice_notifier);
837
unregister_atmdevice_notifier(struct notifier_block * nb)838 void unregister_atmdevice_notifier(struct notifier_block *nb)
839 {
840 atomic_notifier_chain_unregister(&atm_dev_notify_chain, nb);
841 }
842 EXPORT_SYMBOL_GPL(unregister_atmdevice_notifier);
843
atm_init(void)844 static int __init atm_init(void)
845 {
846 int error;
847
848 error = proto_register(&vcc_proto, 0);
849 if (error < 0)
850 goto out;
851 error = atmpvc_init();
852 if (error < 0) {
853 pr_err("atmpvc_init() failed with %d\n", error);
854 goto out_unregister_vcc_proto;
855 }
856 error = atmsvc_init();
857 if (error < 0) {
858 pr_err("atmsvc_init() failed with %d\n", error);
859 goto out_atmpvc_exit;
860 }
861 error = atm_proc_init();
862 if (error < 0) {
863 pr_err("atm_proc_init() failed with %d\n", error);
864 goto out_atmsvc_exit;
865 }
866 error = atm_sysfs_init();
867 if (error < 0) {
868 pr_err("atm_sysfs_init() failed with %d\n", error);
869 goto out_atmproc_exit;
870 }
871 out:
872 return error;
873 out_atmproc_exit:
874 atm_proc_exit();
875 out_atmsvc_exit:
876 atmsvc_exit();
877 out_atmpvc_exit:
878 atmsvc_exit();
879 out_unregister_vcc_proto:
880 proto_unregister(&vcc_proto);
881 goto out;
882 }
883
atm_exit(void)884 static void __exit atm_exit(void)
885 {
886 atm_proc_exit();
887 atm_sysfs_exit();
888 atmsvc_exit();
889 atmpvc_exit();
890 proto_unregister(&vcc_proto);
891 }
892
893 subsys_initcall(atm_init);
894
895 module_exit(atm_exit);
896
897 MODULE_LICENSE("GPL");
898 MODULE_ALIAS_NETPROTO(PF_ATMPVC);
899 MODULE_ALIAS_NETPROTO(PF_ATMSVC);
900