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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
34struct hlist_head vcc_hash[VCC_HTABLE_SIZE];
35EXPORT_SYMBOL(vcc_hash);
36
37DEFINE_RWLOCK(vcc_sklist_lock);
38EXPORT_SYMBOL(vcc_sklist_lock);
39
40static ATOMIC_NOTIFIER_HEAD(atm_dev_notify_chain);
41
42static 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
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}
56EXPORT_SYMBOL(vcc_insert_socket);
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
65static 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
82static 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
93static 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 (skwq_has_sleeper(wq))
100 wake_up(&wq->wait);
101 rcu_read_unlock();
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 +
109 atomic_read(&sk->sk_wmem_alloc)) <= sk->sk_sndbuf;
110}
111
112static 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 (skwq_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
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
137static struct proto vcc_proto = {
138 .name = "VCC",
139 .owner = THIS_MODULE,
140 .obj_size = sizeof(struct atm_vcc),
141 .release_cb = vcc_release_cb,
142};
143
144int vcc_create(struct net *net, struct socket *sock, int protocol, int family, int kern)
145{
146 struct sock *sk;
147 struct atm_vcc *vcc;
148
149 sock->sk = NULL;
150 if (sock->type == SOCK_STREAM)
151 return -EINVAL;
152 sk = sk_alloc(net, family, GFP_KERNEL, &vcc_proto, kern);
153 if (!sk)
154 return -ENOMEM;
155 sock_init_data(sock, sk);
156 sk->sk_state_change = vcc_def_wakeup;
157 sk->sk_write_space = vcc_write_space;
158
159 vcc = atm_sk(sk);
160 vcc->dev = NULL;
161 memset(&vcc->local, 0, sizeof(struct sockaddr_atmsvc));
162 memset(&vcc->remote, 0, sizeof(struct sockaddr_atmsvc));
163 vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */
164 atomic_set(&sk->sk_wmem_alloc, 1);
165 atomic_set(&sk->sk_rmem_alloc, 0);
166 vcc->push = NULL;
167 vcc->pop = NULL;
168 vcc->owner = NULL;
169 vcc->push_oam = NULL;
170 vcc->release_cb = NULL;
171 vcc->vpi = vcc->vci = 0; /* no VCI/VPI yet */
172 vcc->atm_options = vcc->aal_options = 0;
173 sk->sk_destruct = vcc_sock_destruct;
174 return 0;
175}
176
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 */
189 module_put(vcc->owner);
190
191 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
192 atm_return(vcc, skb->truesize);
193 kfree_skb(skb);
194 }
195
196 module_put(vcc->dev->ops->owner);
197 atm_dev_put(vcc->dev);
198 }
199
200 vcc_remove_socket(sk);
201}
202
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
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}
227EXPORT_SYMBOL(vcc_release_async);
228
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
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);
265
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 *tmp;
274 struct sock *s;
275 struct atm_vcc *vcc;
276
277 sk_for_each_safe(s, tmp, head) {
278 vcc = atm_sk(s);
279 if (vcc->dev == dev) {
280 vcc_release_async(vcc, -EPIPE);
281 sk_del_node_init(s);
282 }
283 }
284 }
285 write_unlock_irq(&vcc_sklist_lock);
286}
287EXPORT_SYMBOL(atm_dev_release_vccs);
288
289static int adjust_tp(struct atm_trafprm *tp, unsigned char aal)
290{
291 int max_sdu;
292
293 if (!tp->traffic_class)
294 return 0;
295 switch (aal) {
296 case ATM_AAL0:
297 max_sdu = ATM_CELL_SIZE-1;
298 break;
299 case ATM_AAL34:
300 max_sdu = ATM_MAX_AAL34_PDU;
301 break;
302 default:
303 pr_warn("AAL problems ... (%d)\n", aal);
304 /* fall through */
305 case ATM_AAL5:
306 max_sdu = ATM_MAX_AAL5_PDU;
307 }
308 if (!tp->max_sdu)
309 tp->max_sdu = max_sdu;
310 else if (tp->max_sdu > max_sdu)
311 return -EINVAL;
312 if (!tp->max_cdv)
313 tp->max_cdv = ATM_MAX_CDV;
314 return 0;
315}
316
317static int check_ci(const struct atm_vcc *vcc, short vpi, int vci)
318{
319 struct hlist_head *head = &vcc_hash[vci & (VCC_HTABLE_SIZE - 1)];
320 struct sock *s;
321 struct atm_vcc *walk;
322
323 sk_for_each(s, head) {
324 walk = atm_sk(s);
325 if (walk->dev != vcc->dev)
326 continue;
327 if (test_bit(ATM_VF_ADDR, &walk->flags) && walk->vpi == vpi &&
328 walk->vci == vci && ((walk->qos.txtp.traffic_class !=
329 ATM_NONE && vcc->qos.txtp.traffic_class != ATM_NONE) ||
330 (walk->qos.rxtp.traffic_class != ATM_NONE &&
331 vcc->qos.rxtp.traffic_class != ATM_NONE)))
332 return -EADDRINUSE;
333 }
334
335 /* allow VCCs with same VPI/VCI iff they don't collide on
336 TX/RX (but we may refuse such sharing for other reasons,
337 e.g. if protocol requires to have both channels) */
338
339 return 0;
340}
341
342static int find_ci(const struct atm_vcc *vcc, short *vpi, int *vci)
343{
344 static short p; /* poor man's per-device cache */
345 static int c;
346 short old_p;
347 int old_c;
348 int err;
349
350 if (*vpi != ATM_VPI_ANY && *vci != ATM_VCI_ANY) {
351 err = check_ci(vcc, *vpi, *vci);
352 return err;
353 }
354 /* last scan may have left values out of bounds for current device */
355 if (*vpi != ATM_VPI_ANY)
356 p = *vpi;
357 else if (p >= 1 << vcc->dev->ci_range.vpi_bits)
358 p = 0;
359 if (*vci != ATM_VCI_ANY)
360 c = *vci;
361 else if (c < ATM_NOT_RSV_VCI || c >= 1 << vcc->dev->ci_range.vci_bits)
362 c = ATM_NOT_RSV_VCI;
363 old_p = p;
364 old_c = c;
365 do {
366 if (!check_ci(vcc, p, c)) {
367 *vpi = p;
368 *vci = c;
369 return 0;
370 }
371 if (*vci == ATM_VCI_ANY) {
372 c++;
373 if (c >= 1 << vcc->dev->ci_range.vci_bits)
374 c = ATM_NOT_RSV_VCI;
375 }
376 if ((c == ATM_NOT_RSV_VCI || *vci != ATM_VCI_ANY) &&
377 *vpi == ATM_VPI_ANY) {
378 p++;
379 if (p >= 1 << vcc->dev->ci_range.vpi_bits)
380 p = 0;
381 }
382 } while (old_p != p || old_c != c);
383 return -EADDRINUSE;
384}
385
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;
398 error = -ENODEV;
399 if (!try_module_get(dev->ops->owner))
400 return error;
401 vcc->dev = dev;
402 write_lock_irq(&vcc_sklist_lock);
403 if (test_bit(ATM_DF_REMOVED, &dev->flags) ||
404 (error = find_ci(vcc, &vpi, &vci))) {
405 write_unlock_irq(&vcc_sklist_lock);
406 goto fail_module_put;
407 }
408 vcc->vpi = vpi;
409 vcc->vci = vci;
410 __vcc_insert_socket(sk);
411 write_unlock_irq(&vcc_sklist_lock);
412 switch (vcc->qos.aal) {
413 case ATM_AAL0:
414 error = atm_init_aal0(vcc);
415 vcc->stats = &dev->stats.aal0;
416 break;
417 case ATM_AAL34:
418 error = atm_init_aal34(vcc);
419 vcc->stats = &dev->stats.aal34;
420 break;
421 case ATM_NO_AAL:
422 /* ATM_AAL5 is also used in the "0 for default" case */
423 vcc->qos.aal = ATM_AAL5;
424 /* fall through */
425 case ATM_AAL5:
426 error = atm_init_aal5(vcc);
427 vcc->stats = &dev->stats.aal5;
428 break;
429 default:
430 error = -EPROTOTYPE;
431 }
432 if (!error)
433 error = adjust_tp(&vcc->qos.txtp, vcc->qos.aal);
434 if (!error)
435 error = adjust_tp(&vcc->qos.rxtp, vcc->qos.aal);
436 if (error)
437 goto fail;
438 pr_debug("VCC %d.%d, AAL %d\n", vpi, vci, vcc->qos.aal);
439 pr_debug(" TX: %d, PCR %d..%d, SDU %d\n",
440 vcc->qos.txtp.traffic_class,
441 vcc->qos.txtp.min_pcr,
442 vcc->qos.txtp.max_pcr,
443 vcc->qos.txtp.max_sdu);
444 pr_debug(" RX: %d, PCR %d..%d, SDU %d\n",
445 vcc->qos.rxtp.traffic_class,
446 vcc->qos.rxtp.min_pcr,
447 vcc->qos.rxtp.max_pcr,
448 vcc->qos.rxtp.max_sdu);
449
450 if (dev->ops->open) {
451 error = dev->ops->open(vcc);
452 if (error)
453 goto fail;
454 }
455 return 0;
456
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
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
472 pr_debug("(vpi %d, vci %d)\n", vpi, vci);
473 if (sock->state == SS_CONNECTED)
474 return -EISCONN;
475 if (sock->state != SS_UNCONNECTED)
476 return -EINVAL;
477 if (!(vpi || vci))
478 return -EINVAL;
479
480 if (vpi != ATM_VPI_UNSPEC && vci != ATM_VCI_UNSPEC)
481 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
482 else
483 if (test_bit(ATM_VF_PARTIAL, &vcc->flags))
484 return -EINVAL;
485 pr_debug("(TX: cl %d,bw %d-%d,sdu %d; "
486 "RX: cl %d,bw %d-%d,sdu %d,AAL %s%d)\n",
487 vcc->qos.txtp.traffic_class, vcc->qos.txtp.min_pcr,
488 vcc->qos.txtp.max_pcr, vcc->qos.txtp.max_sdu,
489 vcc->qos.rxtp.traffic_class, vcc->qos.rxtp.min_pcr,
490 vcc->qos.rxtp.max_pcr, vcc->qos.rxtp.max_sdu,
491 vcc->qos.aal == ATM_AAL5 ? "" :
492 vcc->qos.aal == ATM_AAL0 ? "" : " ??? code ",
493 vcc->qos.aal == ATM_AAL0 ? 0 : vcc->qos.aal);
494 if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
495 return -EBADFD;
496 if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
497 vcc->qos.rxtp.traffic_class == ATM_ANYCLASS)
498 return -EINVAL;
499 if (likely(itf != ATM_ITF_ANY)) {
500 dev = try_then_request_module(atm_dev_lookup(itf),
501 "atm-device-%d", itf);
502 } else {
503 dev = NULL;
504 mutex_lock(&atm_dev_mutex);
505 if (!list_empty(&atm_devs)) {
506 dev = list_entry(atm_devs.next,
507 struct atm_dev, dev_list);
508 atm_dev_hold(dev);
509 }
510 mutex_unlock(&atm_dev_mutex);
511 }
512 if (!dev)
513 return -ENODEV;
514 error = __vcc_connect(vcc, dev, vpi, vci);
515 if (error) {
516 atm_dev_put(dev);
517 return error;
518 }
519 if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC)
520 set_bit(ATM_VF_PARTIAL, &vcc->flags);
521 if (test_bit(ATM_VF_READY, &ATM_SD(sock)->flags))
522 sock->state = SS_CONNECTED;
523 return 0;
524}
525
526int vcc_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
527 int flags)
528{
529 struct sock *sk = sock->sk;
530 struct atm_vcc *vcc;
531 struct sk_buff *skb;
532 int copied, error = -EINVAL;
533
534 if (sock->state != SS_CONNECTED)
535 return -ENOTCONN;
536
537 /* only handle MSG_DONTWAIT and MSG_PEEK */
538 if (flags & ~(MSG_DONTWAIT | MSG_PEEK))
539 return -EOPNOTSUPP;
540
541 vcc = ATM_SD(sock);
542 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
543 test_bit(ATM_VF_CLOSE, &vcc->flags) ||
544 !test_bit(ATM_VF_READY, &vcc->flags))
545 return 0;
546
547 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &error);
548 if (!skb)
549 return error;
550
551 copied = skb->len;
552 if (copied > size) {
553 copied = size;
554 msg->msg_flags |= MSG_TRUNC;
555 }
556
557 error = skb_copy_datagram_msg(skb, 0, msg, copied);
558 if (error)
559 return error;
560 sock_recv_ts_and_drops(msg, sk, skb);
561
562 if (!(flags & MSG_PEEK)) {
563 pr_debug("%d -= %d\n", atomic_read(&sk->sk_rmem_alloc),
564 skb->truesize);
565 atm_return(vcc, skb->truesize);
566 }
567
568 skb_free_datagram(sk, skb);
569 return copied;
570}
571
572int vcc_sendmsg(struct socket *sock, struct msghdr *m, size_t size)
573{
574 struct sock *sk = sock->sk;
575 DEFINE_WAIT(wait);
576 struct atm_vcc *vcc;
577 struct sk_buff *skb;
578 int eff, error;
579
580 lock_sock(sk);
581 if (sock->state != SS_CONNECTED) {
582 error = -ENOTCONN;
583 goto out;
584 }
585 if (m->msg_name) {
586 error = -EISCONN;
587 goto out;
588 }
589 vcc = ATM_SD(sock);
590 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
591 test_bit(ATM_VF_CLOSE, &vcc->flags) ||
592 !test_bit(ATM_VF_READY, &vcc->flags)) {
593 error = -EPIPE;
594 send_sig(SIGPIPE, current, 0);
595 goto out;
596 }
597 if (!size) {
598 error = 0;
599 goto out;
600 }
601 if (size > vcc->qos.txtp.max_sdu) {
602 error = -EMSGSIZE;
603 goto out;
604 }
605
606 eff = (size+3) & ~3; /* align to word boundary */
607 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
608 error = 0;
609 while (!(skb = alloc_tx(vcc, eff))) {
610 if (m->msg_flags & MSG_DONTWAIT) {
611 error = -EAGAIN;
612 break;
613 }
614 schedule();
615 if (signal_pending(current)) {
616 error = -ERESTARTSYS;
617 break;
618 }
619 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
620 test_bit(ATM_VF_CLOSE, &vcc->flags) ||
621 !test_bit(ATM_VF_READY, &vcc->flags)) {
622 error = -EPIPE;
623 send_sig(SIGPIPE, current, 0);
624 break;
625 }
626 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
627 }
628 finish_wait(sk_sleep(sk), &wait);
629 if (error)
630 goto out;
631 skb->dev = NULL; /* for paths shared with net_device interfaces */
632 ATM_SKB(skb)->atm_options = vcc->atm_options;
633 if (copy_from_iter(skb_put(skb, size), size, &m->msg_iter) != size) {
634 kfree_skb(skb);
635 error = -EFAULT;
636 goto out;
637 }
638 if (eff != size)
639 memset(skb->data + size, 0, eff-size);
640 error = vcc->dev->ops->send(vcc, skb);
641 error = error ? error : size;
642out:
643 release_sock(sk);
644 return error;
645}
646
647unsigned int vcc_poll(struct file *file, struct socket *sock, poll_table *wait)
648{
649 struct sock *sk = sock->sk;
650 struct atm_vcc *vcc;
651 unsigned int mask;
652
653 sock_poll_wait(file, sk_sleep(sk), wait);
654 mask = 0;
655
656 vcc = ATM_SD(sock);
657
658 /* exceptional events */
659 if (sk->sk_err)
660 mask = POLLERR;
661
662 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
663 test_bit(ATM_VF_CLOSE, &vcc->flags))
664 mask |= POLLHUP;
665
666 /* readable? */
667 if (!skb_queue_empty(&sk->sk_receive_queue))
668 mask |= POLLIN | POLLRDNORM;
669
670 /* writable? */
671 if (sock->state == SS_CONNECTING &&
672 test_bit(ATM_VF_WAITING, &vcc->flags))
673 return mask;
674
675 if (vcc->qos.txtp.traffic_class != ATM_NONE &&
676 vcc_writable(sk))
677 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
678
679 return mask;
680}
681
682static int atm_change_qos(struct atm_vcc *vcc, struct atm_qos *qos)
683{
684 int error;
685
686 /*
687 * Don't let the QoS change the already connected AAL type nor the
688 * traffic class.
689 */
690 if (qos->aal != vcc->qos.aal ||
691 qos->rxtp.traffic_class != vcc->qos.rxtp.traffic_class ||
692 qos->txtp.traffic_class != vcc->qos.txtp.traffic_class)
693 return -EINVAL;
694 error = adjust_tp(&qos->txtp, qos->aal);
695 if (!error)
696 error = adjust_tp(&qos->rxtp, qos->aal);
697 if (error)
698 return error;
699 if (!vcc->dev->ops->change_qos)
700 return -EOPNOTSUPP;
701 if (sk_atm(vcc)->sk_family == AF_ATMPVC)
702 return vcc->dev->ops->change_qos(vcc, qos, ATM_MF_SET);
703 return svc_change_qos(vcc, qos);
704}
705
706static int check_tp(const struct atm_trafprm *tp)
707{
708 /* @@@ Should be merged with adjust_tp */
709 if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS)
710 return 0;
711 if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr &&
712 !tp->max_pcr)
713 return -EINVAL;
714 if (tp->min_pcr == ATM_MAX_PCR)
715 return -EINVAL;
716 if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR &&
717 tp->min_pcr > tp->max_pcr)
718 return -EINVAL;
719 /*
720 * We allow pcr to be outside [min_pcr,max_pcr], because later
721 * adjustment may still push it in the valid range.
722 */
723 return 0;
724}
725
726static int check_qos(const struct atm_qos *qos)
727{
728 int error;
729
730 if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class)
731 return -EINVAL;
732 if (qos->txtp.traffic_class != qos->rxtp.traffic_class &&
733 qos->txtp.traffic_class && qos->rxtp.traffic_class &&
734 qos->txtp.traffic_class != ATM_ANYCLASS &&
735 qos->rxtp.traffic_class != ATM_ANYCLASS)
736 return -EINVAL;
737 error = check_tp(&qos->txtp);
738 if (error)
739 return error;
740 return check_tp(&qos->rxtp);
741}
742
743int vcc_setsockopt(struct socket *sock, int level, int optname,
744 char __user *optval, unsigned int optlen)
745{
746 struct atm_vcc *vcc;
747 unsigned long value;
748 int error;
749
750 if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname))
751 return -EINVAL;
752
753 vcc = ATM_SD(sock);
754 switch (optname) {
755 case SO_ATMQOS:
756 {
757 struct atm_qos qos;
758
759 if (copy_from_user(&qos, optval, sizeof(qos)))
760 return -EFAULT;
761 error = check_qos(&qos);
762 if (error)
763 return error;
764 if (sock->state == SS_CONNECTED)
765 return atm_change_qos(vcc, &qos);
766 if (sock->state != SS_UNCONNECTED)
767 return -EBADFD;
768 vcc->qos = qos;
769 set_bit(ATM_VF_HASQOS, &vcc->flags);
770 return 0;
771 }
772 case SO_SETCLP:
773 if (get_user(value, (unsigned long __user *)optval))
774 return -EFAULT;
775 if (value)
776 vcc->atm_options |= ATM_ATMOPT_CLP;
777 else
778 vcc->atm_options &= ~ATM_ATMOPT_CLP;
779 return 0;
780 default:
781 if (level == SOL_SOCKET)
782 return -EINVAL;
783 break;
784 }
785 if (!vcc->dev || !vcc->dev->ops->setsockopt)
786 return -EINVAL;
787 return vcc->dev->ops->setsockopt(vcc, level, optname, optval, optlen);
788}
789
790int vcc_getsockopt(struct socket *sock, int level, int optname,
791 char __user *optval, int __user *optlen)
792{
793 struct atm_vcc *vcc;
794 int len;
795
796 if (get_user(len, optlen))
797 return -EFAULT;
798 if (__SO_LEVEL_MATCH(optname, level) && len != __SO_SIZE(optname))
799 return -EINVAL;
800
801 vcc = ATM_SD(sock);
802 switch (optname) {
803 case SO_ATMQOS:
804 if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
805 return -EINVAL;
806 return copy_to_user(optval, &vcc->qos, sizeof(vcc->qos))
807 ? -EFAULT : 0;
808 case SO_SETCLP:
809 return put_user(vcc->atm_options & ATM_ATMOPT_CLP ? 1 : 0,
810 (unsigned long __user *)optval) ? -EFAULT : 0;
811 case SO_ATMPVC:
812 {
813 struct sockaddr_atmpvc pvc;
814
815 if (!vcc->dev || !test_bit(ATM_VF_ADDR, &vcc->flags))
816 return -ENOTCONN;
817 memset(&pvc, 0, sizeof(pvc));
818 pvc.sap_family = AF_ATMPVC;
819 pvc.sap_addr.itf = vcc->dev->number;
820 pvc.sap_addr.vpi = vcc->vpi;
821 pvc.sap_addr.vci = vcc->vci;
822 return copy_to_user(optval, &pvc, sizeof(pvc)) ? -EFAULT : 0;
823 }
824 default:
825 if (level == SOL_SOCKET)
826 return -EINVAL;
827 break;
828 }
829 if (!vcc->dev || !vcc->dev->ops->getsockopt)
830 return -EINVAL;
831 return vcc->dev->ops->getsockopt(vcc, level, optname, optval, len);
832}
833
834int register_atmdevice_notifier(struct notifier_block *nb)
835{
836 return atomic_notifier_chain_register(&atm_dev_notify_chain, nb);
837}
838EXPORT_SYMBOL_GPL(register_atmdevice_notifier);
839
840void unregister_atmdevice_notifier(struct notifier_block *nb)
841{
842 atomic_notifier_chain_unregister(&atm_dev_notify_chain, nb);
843}
844EXPORT_SYMBOL_GPL(unregister_atmdevice_notifier);
845
846static int __init atm_init(void)
847{
848 int error;
849
850 error = proto_register(&vcc_proto, 0);
851 if (error < 0)
852 goto out;
853 error = atmpvc_init();
854 if (error < 0) {
855 pr_err("atmpvc_init() failed with %d\n", error);
856 goto out_unregister_vcc_proto;
857 }
858 error = atmsvc_init();
859 if (error < 0) {
860 pr_err("atmsvc_init() failed with %d\n", error);
861 goto out_atmpvc_exit;
862 }
863 error = atm_proc_init();
864 if (error < 0) {
865 pr_err("atm_proc_init() failed with %d\n", error);
866 goto out_atmsvc_exit;
867 }
868 error = atm_sysfs_init();
869 if (error < 0) {
870 pr_err("atm_sysfs_init() failed with %d\n", error);
871 goto out_atmproc_exit;
872 }
873out:
874 return error;
875out_atmproc_exit:
876 atm_proc_exit();
877out_atmsvc_exit:
878 atmsvc_exit();
879out_atmpvc_exit:
880 atmsvc_exit();
881out_unregister_vcc_proto:
882 proto_unregister(&vcc_proto);
883 goto out;
884}
885
886static void __exit atm_exit(void)
887{
888 atm_proc_exit();
889 atm_sysfs_exit();
890 atmsvc_exit();
891 atmpvc_exit();
892 proto_unregister(&vcc_proto);
893}
894
895subsys_initcall(atm_init);
896
897module_exit(atm_exit);
898
899MODULE_LICENSE("GPL");
900MODULE_ALIAS_NETPROTO(PF_ATMPVC);
901MODULE_ALIAS_NETPROTO(PF_ATMSVC);
1// SPDX-License-Identifier: GPL-2.0-only
2/* net/atm/common.c - ATM sockets (common part for PVC and SVC) */
3
4/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
5
6#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
7
8#include <linux/module.h>
9#include <linux/kmod.h>
10#include <linux/net.h> /* struct socket, struct proto_ops */
11#include <linux/atm.h> /* ATM stuff */
12#include <linux/atmdev.h>
13#include <linux/socket.h> /* SOL_SOCKET */
14#include <linux/errno.h> /* error codes */
15#include <linux/capability.h>
16#include <linux/mm.h>
17#include <linux/sched/signal.h>
18#include <linux/time64.h> /* 64-bit time for seconds */
19#include <linux/skbuff.h>
20#include <linux/bitops.h>
21#include <linux/init.h>
22#include <linux/slab.h>
23#include <net/sock.h> /* struct sock */
24#include <linux/uaccess.h>
25#include <linux/poll.h>
26
27#include <linux/atomic.h>
28
29#include "resources.h" /* atm_find_dev */
30#include "common.h" /* prototypes */
31#include "protocols.h" /* atm_init_<transport> */
32#include "addr.h" /* address registry */
33#include "signaling.h" /* for WAITING and sigd_attach */
34
35struct hlist_head vcc_hash[VCC_HTABLE_SIZE];
36EXPORT_SYMBOL(vcc_hash);
37
38DEFINE_RWLOCK(vcc_sklist_lock);
39EXPORT_SYMBOL(vcc_sklist_lock);
40
41static ATOMIC_NOTIFIER_HEAD(atm_dev_notify_chain);
42
43static void __vcc_insert_socket(struct sock *sk)
44{
45 struct atm_vcc *vcc = atm_sk(sk);
46 struct hlist_head *head = &vcc_hash[vcc->vci & (VCC_HTABLE_SIZE - 1)];
47 sk->sk_hash = vcc->vci & (VCC_HTABLE_SIZE - 1);
48 sk_add_node(sk, head);
49}
50
51void vcc_insert_socket(struct sock *sk)
52{
53 write_lock_irq(&vcc_sklist_lock);
54 __vcc_insert_socket(sk);
55 write_unlock_irq(&vcc_sklist_lock);
56}
57EXPORT_SYMBOL(vcc_insert_socket);
58
59static void vcc_remove_socket(struct sock *sk)
60{
61 write_lock_irq(&vcc_sklist_lock);
62 sk_del_node_init(sk);
63 write_unlock_irq(&vcc_sklist_lock);
64}
65
66static bool vcc_tx_ready(struct atm_vcc *vcc, unsigned int size)
67{
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 false;
74 }
75 return true;
76}
77
78static void vcc_sock_destruct(struct sock *sk)
79{
80 if (atomic_read(&sk->sk_rmem_alloc))
81 printk(KERN_DEBUG "%s: rmem leakage (%d bytes) detected.\n",
82 __func__, atomic_read(&sk->sk_rmem_alloc));
83
84 if (refcount_read(&sk->sk_wmem_alloc))
85 printk(KERN_DEBUG "%s: wmem leakage (%d bytes) detected.\n",
86 __func__, refcount_read(&sk->sk_wmem_alloc));
87}
88
89static void vcc_def_wakeup(struct sock *sk)
90{
91 struct socket_wq *wq;
92
93 rcu_read_lock();
94 wq = rcu_dereference(sk->sk_wq);
95 if (skwq_has_sleeper(wq))
96 wake_up(&wq->wait);
97 rcu_read_unlock();
98}
99
100static inline int vcc_writable(struct sock *sk)
101{
102 struct atm_vcc *vcc = atm_sk(sk);
103
104 return (vcc->qos.txtp.max_sdu +
105 refcount_read(&sk->sk_wmem_alloc)) <= sk->sk_sndbuf;
106}
107
108static void vcc_write_space(struct sock *sk)
109{
110 struct socket_wq *wq;
111
112 rcu_read_lock();
113
114 if (vcc_writable(sk)) {
115 wq = rcu_dereference(sk->sk_wq);
116 if (skwq_has_sleeper(wq))
117 wake_up_interruptible(&wq->wait);
118
119 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
120 }
121
122 rcu_read_unlock();
123}
124
125static void vcc_release_cb(struct sock *sk)
126{
127 struct atm_vcc *vcc = atm_sk(sk);
128
129 if (vcc->release_cb)
130 vcc->release_cb(vcc);
131}
132
133static struct proto vcc_proto = {
134 .name = "VCC",
135 .owner = THIS_MODULE,
136 .obj_size = sizeof(struct atm_vcc),
137 .release_cb = vcc_release_cb,
138};
139
140int vcc_create(struct net *net, struct socket *sock, int protocol, int family, int kern)
141{
142 struct sock *sk;
143 struct atm_vcc *vcc;
144
145 sock->sk = NULL;
146 if (sock->type == SOCK_STREAM)
147 return -EINVAL;
148 sk = sk_alloc(net, family, GFP_KERNEL, &vcc_proto, kern);
149 if (!sk)
150 return -ENOMEM;
151 sock_init_data(sock, sk);
152 sk->sk_state_change = vcc_def_wakeup;
153 sk->sk_write_space = vcc_write_space;
154
155 vcc = atm_sk(sk);
156 vcc->dev = NULL;
157 memset(&vcc->local, 0, sizeof(struct sockaddr_atmsvc));
158 memset(&vcc->remote, 0, sizeof(struct sockaddr_atmsvc));
159 vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */
160 refcount_set(&sk->sk_wmem_alloc, 1);
161 atomic_set(&sk->sk_rmem_alloc, 0);
162 vcc->push = NULL;
163 vcc->pop = NULL;
164 vcc->owner = NULL;
165 vcc->push_oam = NULL;
166 vcc->release_cb = NULL;
167 vcc->vpi = vcc->vci = 0; /* no VCI/VPI yet */
168 vcc->atm_options = vcc->aal_options = 0;
169 sk->sk_destruct = vcc_sock_destruct;
170 return 0;
171}
172
173static void vcc_destroy_socket(struct sock *sk)
174{
175 struct atm_vcc *vcc = atm_sk(sk);
176 struct sk_buff *skb;
177
178 set_bit(ATM_VF_CLOSE, &vcc->flags);
179 clear_bit(ATM_VF_READY, &vcc->flags);
180 if (vcc->dev) {
181 if (vcc->dev->ops->close)
182 vcc->dev->ops->close(vcc);
183 if (vcc->push)
184 vcc->push(vcc, NULL); /* atmarpd has no push */
185 module_put(vcc->owner);
186
187 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
188 atm_return(vcc, skb->truesize);
189 kfree_skb(skb);
190 }
191
192 module_put(vcc->dev->ops->owner);
193 atm_dev_put(vcc->dev);
194 }
195
196 vcc_remove_socket(sk);
197}
198
199int vcc_release(struct socket *sock)
200{
201 struct sock *sk = sock->sk;
202
203 if (sk) {
204 lock_sock(sk);
205 vcc_destroy_socket(sock->sk);
206 release_sock(sk);
207 sock_put(sk);
208 }
209
210 return 0;
211}
212
213void vcc_release_async(struct atm_vcc *vcc, int reply)
214{
215 struct sock *sk = sk_atm(vcc);
216
217 set_bit(ATM_VF_CLOSE, &vcc->flags);
218 sk->sk_shutdown |= RCV_SHUTDOWN;
219 sk->sk_err = -reply;
220 clear_bit(ATM_VF_WAITING, &vcc->flags);
221 sk->sk_state_change(sk);
222}
223EXPORT_SYMBOL(vcc_release_async);
224
225void vcc_process_recv_queue(struct atm_vcc *vcc)
226{
227 struct sk_buff_head queue, *rq;
228 struct sk_buff *skb, *tmp;
229 unsigned long flags;
230
231 __skb_queue_head_init(&queue);
232 rq = &sk_atm(vcc)->sk_receive_queue;
233
234 spin_lock_irqsave(&rq->lock, flags);
235 skb_queue_splice_init(rq, &queue);
236 spin_unlock_irqrestore(&rq->lock, flags);
237
238 skb_queue_walk_safe(&queue, skb, tmp) {
239 __skb_unlink(skb, &queue);
240 vcc->push(vcc, skb);
241 }
242}
243EXPORT_SYMBOL(vcc_process_recv_queue);
244
245void atm_dev_signal_change(struct atm_dev *dev, char signal)
246{
247 pr_debug("%s signal=%d dev=%p number=%d dev->signal=%d\n",
248 __func__, signal, dev, dev->number, dev->signal);
249
250 /* atm driver sending invalid signal */
251 WARN_ON(signal < ATM_PHY_SIG_LOST || signal > ATM_PHY_SIG_FOUND);
252
253 if (dev->signal == signal)
254 return; /* no change */
255
256 dev->signal = signal;
257
258 atomic_notifier_call_chain(&atm_dev_notify_chain, signal, dev);
259}
260EXPORT_SYMBOL(atm_dev_signal_change);
261
262void atm_dev_release_vccs(struct atm_dev *dev)
263{
264 int i;
265
266 write_lock_irq(&vcc_sklist_lock);
267 for (i = 0; i < VCC_HTABLE_SIZE; i++) {
268 struct hlist_head *head = &vcc_hash[i];
269 struct hlist_node *tmp;
270 struct sock *s;
271 struct atm_vcc *vcc;
272
273 sk_for_each_safe(s, tmp, head) {
274 vcc = atm_sk(s);
275 if (vcc->dev == dev) {
276 vcc_release_async(vcc, -EPIPE);
277 sk_del_node_init(s);
278 }
279 }
280 }
281 write_unlock_irq(&vcc_sklist_lock);
282}
283EXPORT_SYMBOL(atm_dev_release_vccs);
284
285static int adjust_tp(struct atm_trafprm *tp, unsigned char aal)
286{
287 int max_sdu;
288
289 if (!tp->traffic_class)
290 return 0;
291 switch (aal) {
292 case ATM_AAL0:
293 max_sdu = ATM_CELL_SIZE-1;
294 break;
295 case ATM_AAL34:
296 max_sdu = ATM_MAX_AAL34_PDU;
297 break;
298 default:
299 pr_warn("AAL problems ... (%d)\n", aal);
300 /* fall through */
301 case ATM_AAL5:
302 max_sdu = ATM_MAX_AAL5_PDU;
303 }
304 if (!tp->max_sdu)
305 tp->max_sdu = max_sdu;
306 else if (tp->max_sdu > max_sdu)
307 return -EINVAL;
308 if (!tp->max_cdv)
309 tp->max_cdv = ATM_MAX_CDV;
310 return 0;
311}
312
313static int check_ci(const struct atm_vcc *vcc, short vpi, int vci)
314{
315 struct hlist_head *head = &vcc_hash[vci & (VCC_HTABLE_SIZE - 1)];
316 struct sock *s;
317 struct atm_vcc *walk;
318
319 sk_for_each(s, head) {
320 walk = atm_sk(s);
321 if (walk->dev != vcc->dev)
322 continue;
323 if (test_bit(ATM_VF_ADDR, &walk->flags) && walk->vpi == vpi &&
324 walk->vci == vci && ((walk->qos.txtp.traffic_class !=
325 ATM_NONE && vcc->qos.txtp.traffic_class != ATM_NONE) ||
326 (walk->qos.rxtp.traffic_class != ATM_NONE &&
327 vcc->qos.rxtp.traffic_class != ATM_NONE)))
328 return -EADDRINUSE;
329 }
330
331 /* allow VCCs with same VPI/VCI iff they don't collide on
332 TX/RX (but we may refuse such sharing for other reasons,
333 e.g. if protocol requires to have both channels) */
334
335 return 0;
336}
337
338static int find_ci(const struct atm_vcc *vcc, short *vpi, int *vci)
339{
340 static short p; /* poor man's per-device cache */
341 static int c;
342 short old_p;
343 int old_c;
344 int err;
345
346 if (*vpi != ATM_VPI_ANY && *vci != ATM_VCI_ANY) {
347 err = check_ci(vcc, *vpi, *vci);
348 return err;
349 }
350 /* last scan may have left values out of bounds for current device */
351 if (*vpi != ATM_VPI_ANY)
352 p = *vpi;
353 else if (p >= 1 << vcc->dev->ci_range.vpi_bits)
354 p = 0;
355 if (*vci != ATM_VCI_ANY)
356 c = *vci;
357 else if (c < ATM_NOT_RSV_VCI || c >= 1 << vcc->dev->ci_range.vci_bits)
358 c = ATM_NOT_RSV_VCI;
359 old_p = p;
360 old_c = c;
361 do {
362 if (!check_ci(vcc, p, c)) {
363 *vpi = p;
364 *vci = c;
365 return 0;
366 }
367 if (*vci == ATM_VCI_ANY) {
368 c++;
369 if (c >= 1 << vcc->dev->ci_range.vci_bits)
370 c = ATM_NOT_RSV_VCI;
371 }
372 if ((c == ATM_NOT_RSV_VCI || *vci != ATM_VCI_ANY) &&
373 *vpi == ATM_VPI_ANY) {
374 p++;
375 if (p >= 1 << vcc->dev->ci_range.vpi_bits)
376 p = 0;
377 }
378 } while (old_p != p || old_c != c);
379 return -EADDRINUSE;
380}
381
382static int __vcc_connect(struct atm_vcc *vcc, struct atm_dev *dev, short vpi,
383 int vci)
384{
385 struct sock *sk = sk_atm(vcc);
386 int error;
387
388 if ((vpi != ATM_VPI_UNSPEC && vpi != ATM_VPI_ANY &&
389 vpi >> dev->ci_range.vpi_bits) || (vci != ATM_VCI_UNSPEC &&
390 vci != ATM_VCI_ANY && vci >> dev->ci_range.vci_bits))
391 return -EINVAL;
392 if (vci > 0 && vci < ATM_NOT_RSV_VCI && !capable(CAP_NET_BIND_SERVICE))
393 return -EPERM;
394 error = -ENODEV;
395 if (!try_module_get(dev->ops->owner))
396 return error;
397 vcc->dev = dev;
398 write_lock_irq(&vcc_sklist_lock);
399 if (test_bit(ATM_DF_REMOVED, &dev->flags) ||
400 (error = find_ci(vcc, &vpi, &vci))) {
401 write_unlock_irq(&vcc_sklist_lock);
402 goto fail_module_put;
403 }
404 vcc->vpi = vpi;
405 vcc->vci = vci;
406 __vcc_insert_socket(sk);
407 write_unlock_irq(&vcc_sklist_lock);
408 switch (vcc->qos.aal) {
409 case ATM_AAL0:
410 error = atm_init_aal0(vcc);
411 vcc->stats = &dev->stats.aal0;
412 break;
413 case ATM_AAL34:
414 error = atm_init_aal34(vcc);
415 vcc->stats = &dev->stats.aal34;
416 break;
417 case ATM_NO_AAL:
418 /* ATM_AAL5 is also used in the "0 for default" case */
419 vcc->qos.aal = ATM_AAL5;
420 /* fall through */
421 case ATM_AAL5:
422 error = atm_init_aal5(vcc);
423 vcc->stats = &dev->stats.aal5;
424 break;
425 default:
426 error = -EPROTOTYPE;
427 }
428 if (!error)
429 error = adjust_tp(&vcc->qos.txtp, vcc->qos.aal);
430 if (!error)
431 error = adjust_tp(&vcc->qos.rxtp, vcc->qos.aal);
432 if (error)
433 goto fail;
434 pr_debug("VCC %d.%d, AAL %d\n", vpi, vci, vcc->qos.aal);
435 pr_debug(" TX: %d, PCR %d..%d, SDU %d\n",
436 vcc->qos.txtp.traffic_class,
437 vcc->qos.txtp.min_pcr,
438 vcc->qos.txtp.max_pcr,
439 vcc->qos.txtp.max_sdu);
440 pr_debug(" RX: %d, PCR %d..%d, SDU %d\n",
441 vcc->qos.rxtp.traffic_class,
442 vcc->qos.rxtp.min_pcr,
443 vcc->qos.rxtp.max_pcr,
444 vcc->qos.rxtp.max_sdu);
445
446 if (dev->ops->open) {
447 error = dev->ops->open(vcc);
448 if (error)
449 goto fail;
450 }
451 return 0;
452
453fail:
454 vcc_remove_socket(sk);
455fail_module_put:
456 module_put(dev->ops->owner);
457 /* ensure we get dev module ref count correct */
458 vcc->dev = NULL;
459 return error;
460}
461
462int vcc_connect(struct socket *sock, int itf, short vpi, int vci)
463{
464 struct atm_dev *dev;
465 struct atm_vcc *vcc = ATM_SD(sock);
466 int error;
467
468 pr_debug("(vpi %d, vci %d)\n", vpi, vci);
469 if (sock->state == SS_CONNECTED)
470 return -EISCONN;
471 if (sock->state != SS_UNCONNECTED)
472 return -EINVAL;
473 if (!(vpi || vci))
474 return -EINVAL;
475
476 if (vpi != ATM_VPI_UNSPEC && vci != ATM_VCI_UNSPEC)
477 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
478 else
479 if (test_bit(ATM_VF_PARTIAL, &vcc->flags))
480 return -EINVAL;
481 pr_debug("(TX: cl %d,bw %d-%d,sdu %d; "
482 "RX: cl %d,bw %d-%d,sdu %d,AAL %s%d)\n",
483 vcc->qos.txtp.traffic_class, vcc->qos.txtp.min_pcr,
484 vcc->qos.txtp.max_pcr, vcc->qos.txtp.max_sdu,
485 vcc->qos.rxtp.traffic_class, vcc->qos.rxtp.min_pcr,
486 vcc->qos.rxtp.max_pcr, vcc->qos.rxtp.max_sdu,
487 vcc->qos.aal == ATM_AAL5 ? "" :
488 vcc->qos.aal == ATM_AAL0 ? "" : " ??? code ",
489 vcc->qos.aal == ATM_AAL0 ? 0 : vcc->qos.aal);
490 if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
491 return -EBADFD;
492 if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
493 vcc->qos.rxtp.traffic_class == ATM_ANYCLASS)
494 return -EINVAL;
495 if (likely(itf != ATM_ITF_ANY)) {
496 dev = try_then_request_module(atm_dev_lookup(itf),
497 "atm-device-%d", itf);
498 } else {
499 dev = NULL;
500 mutex_lock(&atm_dev_mutex);
501 if (!list_empty(&atm_devs)) {
502 dev = list_entry(atm_devs.next,
503 struct atm_dev, dev_list);
504 atm_dev_hold(dev);
505 }
506 mutex_unlock(&atm_dev_mutex);
507 }
508 if (!dev)
509 return -ENODEV;
510 error = __vcc_connect(vcc, dev, vpi, vci);
511 if (error) {
512 atm_dev_put(dev);
513 return error;
514 }
515 if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC)
516 set_bit(ATM_VF_PARTIAL, &vcc->flags);
517 if (test_bit(ATM_VF_READY, &ATM_SD(sock)->flags))
518 sock->state = SS_CONNECTED;
519 return 0;
520}
521
522int vcc_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
523 int flags)
524{
525 struct sock *sk = sock->sk;
526 struct atm_vcc *vcc;
527 struct sk_buff *skb;
528 int copied, error = -EINVAL;
529
530 if (sock->state != SS_CONNECTED)
531 return -ENOTCONN;
532
533 /* only handle MSG_DONTWAIT and MSG_PEEK */
534 if (flags & ~(MSG_DONTWAIT | MSG_PEEK))
535 return -EOPNOTSUPP;
536
537 vcc = ATM_SD(sock);
538 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
539 test_bit(ATM_VF_CLOSE, &vcc->flags) ||
540 !test_bit(ATM_VF_READY, &vcc->flags))
541 return 0;
542
543 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &error);
544 if (!skb)
545 return error;
546
547 copied = skb->len;
548 if (copied > size) {
549 copied = size;
550 msg->msg_flags |= MSG_TRUNC;
551 }
552
553 error = skb_copy_datagram_msg(skb, 0, msg, copied);
554 if (error)
555 return error;
556 sock_recv_ts_and_drops(msg, sk, skb);
557
558 if (!(flags & MSG_PEEK)) {
559 pr_debug("%d -= %d\n", atomic_read(&sk->sk_rmem_alloc),
560 skb->truesize);
561 atm_return(vcc, skb->truesize);
562 }
563
564 skb_free_datagram(sk, skb);
565 return copied;
566}
567
568int vcc_sendmsg(struct socket *sock, struct msghdr *m, size_t size)
569{
570 struct sock *sk = sock->sk;
571 DEFINE_WAIT(wait);
572 struct atm_vcc *vcc;
573 struct sk_buff *skb;
574 int eff, error;
575
576 lock_sock(sk);
577 if (sock->state != SS_CONNECTED) {
578 error = -ENOTCONN;
579 goto out;
580 }
581 if (m->msg_name) {
582 error = -EISCONN;
583 goto out;
584 }
585 vcc = ATM_SD(sock);
586 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
587 test_bit(ATM_VF_CLOSE, &vcc->flags) ||
588 !test_bit(ATM_VF_READY, &vcc->flags)) {
589 error = -EPIPE;
590 send_sig(SIGPIPE, current, 0);
591 goto out;
592 }
593 if (!size) {
594 error = 0;
595 goto out;
596 }
597 if (size > vcc->qos.txtp.max_sdu) {
598 error = -EMSGSIZE;
599 goto out;
600 }
601
602 eff = (size+3) & ~3; /* align to word boundary */
603 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
604 error = 0;
605 while (!vcc_tx_ready(vcc, eff)) {
606 if (m->msg_flags & MSG_DONTWAIT) {
607 error = -EAGAIN;
608 break;
609 }
610 schedule();
611 if (signal_pending(current)) {
612 error = -ERESTARTSYS;
613 break;
614 }
615 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
616 test_bit(ATM_VF_CLOSE, &vcc->flags) ||
617 !test_bit(ATM_VF_READY, &vcc->flags)) {
618 error = -EPIPE;
619 send_sig(SIGPIPE, current, 0);
620 break;
621 }
622 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
623 }
624 finish_wait(sk_sleep(sk), &wait);
625 if (error)
626 goto out;
627
628 skb = alloc_skb(eff, GFP_KERNEL);
629 if (!skb) {
630 error = -ENOMEM;
631 goto out;
632 }
633 pr_debug("%d += %d\n", sk_wmem_alloc_get(sk), skb->truesize);
634 atm_account_tx(vcc, skb);
635
636 skb->dev = NULL; /* for paths shared with net_device interfaces */
637 if (!copy_from_iter_full(skb_put(skb, size), size, &m->msg_iter)) {
638 kfree_skb(skb);
639 error = -EFAULT;
640 goto out;
641 }
642 if (eff != size)
643 memset(skb->data + size, 0, eff-size);
644 error = vcc->dev->ops->send(vcc, skb);
645 error = error ? error : size;
646out:
647 release_sock(sk);
648 return error;
649}
650
651__poll_t vcc_poll(struct file *file, struct socket *sock, poll_table *wait)
652{
653 struct sock *sk = sock->sk;
654 struct atm_vcc *vcc;
655 __poll_t mask;
656
657 sock_poll_wait(file, sock, wait);
658 mask = 0;
659
660 vcc = ATM_SD(sock);
661
662 /* exceptional events */
663 if (sk->sk_err)
664 mask = EPOLLERR;
665
666 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
667 test_bit(ATM_VF_CLOSE, &vcc->flags))
668 mask |= EPOLLHUP;
669
670 /* readable? */
671 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
672 mask |= EPOLLIN | EPOLLRDNORM;
673
674 /* writable? */
675 if (sock->state == SS_CONNECTING &&
676 test_bit(ATM_VF_WAITING, &vcc->flags))
677 return mask;
678
679 if (vcc->qos.txtp.traffic_class != ATM_NONE &&
680 vcc_writable(sk))
681 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
682
683 return mask;
684}
685
686static int atm_change_qos(struct atm_vcc *vcc, struct atm_qos *qos)
687{
688 int error;
689
690 /*
691 * Don't let the QoS change the already connected AAL type nor the
692 * traffic class.
693 */
694 if (qos->aal != vcc->qos.aal ||
695 qos->rxtp.traffic_class != vcc->qos.rxtp.traffic_class ||
696 qos->txtp.traffic_class != vcc->qos.txtp.traffic_class)
697 return -EINVAL;
698 error = adjust_tp(&qos->txtp, qos->aal);
699 if (!error)
700 error = adjust_tp(&qos->rxtp, qos->aal);
701 if (error)
702 return error;
703 if (!vcc->dev->ops->change_qos)
704 return -EOPNOTSUPP;
705 if (sk_atm(vcc)->sk_family == AF_ATMPVC)
706 return vcc->dev->ops->change_qos(vcc, qos, ATM_MF_SET);
707 return svc_change_qos(vcc, qos);
708}
709
710static int check_tp(const struct atm_trafprm *tp)
711{
712 /* @@@ Should be merged with adjust_tp */
713 if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS)
714 return 0;
715 if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr &&
716 !tp->max_pcr)
717 return -EINVAL;
718 if (tp->min_pcr == ATM_MAX_PCR)
719 return -EINVAL;
720 if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR &&
721 tp->min_pcr > tp->max_pcr)
722 return -EINVAL;
723 /*
724 * We allow pcr to be outside [min_pcr,max_pcr], because later
725 * adjustment may still push it in the valid range.
726 */
727 return 0;
728}
729
730static int check_qos(const struct atm_qos *qos)
731{
732 int error;
733
734 if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class)
735 return -EINVAL;
736 if (qos->txtp.traffic_class != qos->rxtp.traffic_class &&
737 qos->txtp.traffic_class && qos->rxtp.traffic_class &&
738 qos->txtp.traffic_class != ATM_ANYCLASS &&
739 qos->rxtp.traffic_class != ATM_ANYCLASS)
740 return -EINVAL;
741 error = check_tp(&qos->txtp);
742 if (error)
743 return error;
744 return check_tp(&qos->rxtp);
745}
746
747int vcc_setsockopt(struct socket *sock, int level, int optname,
748 char __user *optval, unsigned int optlen)
749{
750 struct atm_vcc *vcc;
751 unsigned long value;
752 int error;
753
754 if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname))
755 return -EINVAL;
756
757 vcc = ATM_SD(sock);
758 switch (optname) {
759 case SO_ATMQOS:
760 {
761 struct atm_qos qos;
762
763 if (copy_from_user(&qos, optval, sizeof(qos)))
764 return -EFAULT;
765 error = check_qos(&qos);
766 if (error)
767 return error;
768 if (sock->state == SS_CONNECTED)
769 return atm_change_qos(vcc, &qos);
770 if (sock->state != SS_UNCONNECTED)
771 return -EBADFD;
772 vcc->qos = qos;
773 set_bit(ATM_VF_HASQOS, &vcc->flags);
774 return 0;
775 }
776 case SO_SETCLP:
777 if (get_user(value, (unsigned long __user *)optval))
778 return -EFAULT;
779 if (value)
780 vcc->atm_options |= ATM_ATMOPT_CLP;
781 else
782 vcc->atm_options &= ~ATM_ATMOPT_CLP;
783 return 0;
784 default:
785 if (level == SOL_SOCKET)
786 return -EINVAL;
787 break;
788 }
789 if (!vcc->dev || !vcc->dev->ops->setsockopt)
790 return -EINVAL;
791 return vcc->dev->ops->setsockopt(vcc, level, optname, optval, optlen);
792}
793
794int vcc_getsockopt(struct socket *sock, int level, int optname,
795 char __user *optval, int __user *optlen)
796{
797 struct atm_vcc *vcc;
798 int len;
799
800 if (get_user(len, optlen))
801 return -EFAULT;
802 if (__SO_LEVEL_MATCH(optname, level) && len != __SO_SIZE(optname))
803 return -EINVAL;
804
805 vcc = ATM_SD(sock);
806 switch (optname) {
807 case SO_ATMQOS:
808 if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
809 return -EINVAL;
810 return copy_to_user(optval, &vcc->qos, sizeof(vcc->qos))
811 ? -EFAULT : 0;
812 case SO_SETCLP:
813 return put_user(vcc->atm_options & ATM_ATMOPT_CLP ? 1 : 0,
814 (unsigned long __user *)optval) ? -EFAULT : 0;
815 case SO_ATMPVC:
816 {
817 struct sockaddr_atmpvc pvc;
818
819 if (!vcc->dev || !test_bit(ATM_VF_ADDR, &vcc->flags))
820 return -ENOTCONN;
821 memset(&pvc, 0, sizeof(pvc));
822 pvc.sap_family = AF_ATMPVC;
823 pvc.sap_addr.itf = vcc->dev->number;
824 pvc.sap_addr.vpi = vcc->vpi;
825 pvc.sap_addr.vci = vcc->vci;
826 return copy_to_user(optval, &pvc, sizeof(pvc)) ? -EFAULT : 0;
827 }
828 default:
829 if (level == SOL_SOCKET)
830 return -EINVAL;
831 break;
832 }
833 if (!vcc->dev || !vcc->dev->ops->getsockopt)
834 return -EINVAL;
835 return vcc->dev->ops->getsockopt(vcc, level, optname, optval, len);
836}
837
838int register_atmdevice_notifier(struct notifier_block *nb)
839{
840 return atomic_notifier_chain_register(&atm_dev_notify_chain, nb);
841}
842EXPORT_SYMBOL_GPL(register_atmdevice_notifier);
843
844void unregister_atmdevice_notifier(struct notifier_block *nb)
845{
846 atomic_notifier_chain_unregister(&atm_dev_notify_chain, nb);
847}
848EXPORT_SYMBOL_GPL(unregister_atmdevice_notifier);
849
850static int __init atm_init(void)
851{
852 int error;
853
854 error = proto_register(&vcc_proto, 0);
855 if (error < 0)
856 goto out;
857 error = atmpvc_init();
858 if (error < 0) {
859 pr_err("atmpvc_init() failed with %d\n", error);
860 goto out_unregister_vcc_proto;
861 }
862 error = atmsvc_init();
863 if (error < 0) {
864 pr_err("atmsvc_init() failed with %d\n", error);
865 goto out_atmpvc_exit;
866 }
867 error = atm_proc_init();
868 if (error < 0) {
869 pr_err("atm_proc_init() failed with %d\n", error);
870 goto out_atmsvc_exit;
871 }
872 error = atm_sysfs_init();
873 if (error < 0) {
874 pr_err("atm_sysfs_init() failed with %d\n", error);
875 goto out_atmproc_exit;
876 }
877out:
878 return error;
879out_atmproc_exit:
880 atm_proc_exit();
881out_atmsvc_exit:
882 atmsvc_exit();
883out_atmpvc_exit:
884 atmsvc_exit();
885out_unregister_vcc_proto:
886 proto_unregister(&vcc_proto);
887 goto out;
888}
889
890static void __exit atm_exit(void)
891{
892 atm_proc_exit();
893 atm_sysfs_exit();
894 atmsvc_exit();
895 atmpvc_exit();
896 proto_unregister(&vcc_proto);
897}
898
899subsys_initcall(atm_init);
900
901module_exit(atm_exit);
902
903MODULE_LICENSE("GPL");
904MODULE_ALIAS_NETPROTO(PF_ATMPVC);
905MODULE_ALIAS_NETPROTO(PF_ATMSVC);