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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#include <linux/uio.h>
27
28#include <linux/atomic.h>
29
30#include "resources.h" /* atm_find_dev */
31#include "common.h" /* prototypes */
32#include "protocols.h" /* atm_init_<transport> */
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 bool vcc_tx_ready(struct atm_vcc *vcc, unsigned int size)
66{
67 struct sock *sk = sk_atm(vcc);
68
69 if (sk_wmem_alloc_get(sk) && !atm_may_send(vcc, size)) {
70 pr_debug("Sorry: wmem_alloc = %d, size = %d, sndbuf = %d\n",
71 sk_wmem_alloc_get(sk), size, sk->sk_sndbuf);
72 return false;
73 }
74 return true;
75}
76
77static void vcc_sock_destruct(struct sock *sk)
78{
79 if (atomic_read(&sk->sk_rmem_alloc))
80 printk(KERN_DEBUG "%s: rmem leakage (%d bytes) detected.\n",
81 __func__, atomic_read(&sk->sk_rmem_alloc));
82
83 if (refcount_read(&sk->sk_wmem_alloc))
84 printk(KERN_DEBUG "%s: wmem leakage (%d bytes) detected.\n",
85 __func__, refcount_read(&sk->sk_wmem_alloc));
86}
87
88static void vcc_def_wakeup(struct sock *sk)
89{
90 struct socket_wq *wq;
91
92 rcu_read_lock();
93 wq = rcu_dereference(sk->sk_wq);
94 if (skwq_has_sleeper(wq))
95 wake_up(&wq->wait);
96 rcu_read_unlock();
97}
98
99static inline int vcc_writable(struct sock *sk)
100{
101 struct atm_vcc *vcc = atm_sk(sk);
102
103 return (vcc->qos.txtp.max_sdu +
104 refcount_read(&sk->sk_wmem_alloc)) <= sk->sk_sndbuf;
105}
106
107static void vcc_write_space(struct sock *sk)
108{
109 struct socket_wq *wq;
110
111 rcu_read_lock();
112
113 if (vcc_writable(sk)) {
114 wq = rcu_dereference(sk->sk_wq);
115 if (skwq_has_sleeper(wq))
116 wake_up_interruptible(&wq->wait);
117
118 sk_wake_async_rcu(sk, SOCK_WAKE_SPACE, POLL_OUT);
119 }
120
121 rcu_read_unlock();
122}
123
124static void vcc_release_cb(struct sock *sk)
125{
126 struct atm_vcc *vcc = atm_sk(sk);
127
128 if (vcc->release_cb)
129 vcc->release_cb(vcc);
130}
131
132static struct proto vcc_proto = {
133 .name = "VCC",
134 .owner = THIS_MODULE,
135 .obj_size = sizeof(struct atm_vcc),
136 .release_cb = vcc_release_cb,
137};
138
139int vcc_create(struct net *net, struct socket *sock, int protocol, int family, int kern)
140{
141 struct sock *sk;
142 struct atm_vcc *vcc;
143
144 sock->sk = NULL;
145 if (sock->type == SOCK_STREAM)
146 return -EINVAL;
147 sk = sk_alloc(net, family, GFP_KERNEL, &vcc_proto, kern);
148 if (!sk)
149 return -ENOMEM;
150 sock_init_data(sock, sk);
151 sk->sk_state_change = vcc_def_wakeup;
152 sk->sk_write_space = vcc_write_space;
153
154 vcc = atm_sk(sk);
155 vcc->dev = NULL;
156 vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */
157 refcount_set(&sk->sk_wmem_alloc, SK_WMEM_ALLOC_BIAS);
158 atomic_set(&sk->sk_rmem_alloc, 0);
159 vcc->push = NULL;
160 vcc->pop = NULL;
161 vcc->owner = NULL;
162 vcc->release_cb = NULL;
163 vcc->vpi = vcc->vci = 0; /* no VCI/VPI yet */
164 vcc->atm_options = vcc->aal_options = 0;
165 sk->sk_destruct = vcc_sock_destruct;
166 return 0;
167}
168
169static void vcc_destroy_socket(struct sock *sk)
170{
171 struct atm_vcc *vcc = atm_sk(sk);
172 struct sk_buff *skb;
173
174 set_bit(ATM_VF_CLOSE, &vcc->flags);
175 clear_bit(ATM_VF_READY, &vcc->flags);
176 if (vcc->dev && vcc->dev->ops->close)
177 vcc->dev->ops->close(vcc);
178 if (vcc->push)
179 vcc->push(vcc, NULL); /* atmarpd has no push */
180 module_put(vcc->owner);
181
182 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
183 atm_return(vcc, skb->truesize);
184 kfree_skb(skb);
185 }
186
187 if (vcc->dev && vcc->dev->ops->owner) {
188 module_put(vcc->dev->ops->owner);
189 atm_dev_put(vcc->dev);
190 }
191
192 vcc_remove_socket(sk);
193}
194
195int vcc_release(struct socket *sock)
196{
197 struct sock *sk = sock->sk;
198
199 if (sk) {
200 lock_sock(sk);
201 vcc_destroy_socket(sock->sk);
202 release_sock(sk);
203 sock_put(sk);
204 }
205
206 return 0;
207}
208
209void vcc_release_async(struct atm_vcc *vcc, int reply)
210{
211 struct sock *sk = sk_atm(vcc);
212
213 set_bit(ATM_VF_CLOSE, &vcc->flags);
214 sk->sk_shutdown |= RCV_SHUTDOWN;
215 sk->sk_err = -reply;
216 sk->sk_state_change(sk);
217}
218EXPORT_SYMBOL(vcc_release_async);
219
220void vcc_process_recv_queue(struct atm_vcc *vcc)
221{
222 struct sk_buff_head queue, *rq;
223 struct sk_buff *skb, *tmp;
224 unsigned long flags;
225
226 __skb_queue_head_init(&queue);
227 rq = &sk_atm(vcc)->sk_receive_queue;
228
229 spin_lock_irqsave(&rq->lock, flags);
230 skb_queue_splice_init(rq, &queue);
231 spin_unlock_irqrestore(&rq->lock, flags);
232
233 skb_queue_walk_safe(&queue, skb, tmp) {
234 __skb_unlink(skb, &queue);
235 vcc->push(vcc, skb);
236 }
237}
238EXPORT_SYMBOL(vcc_process_recv_queue);
239
240void atm_dev_signal_change(struct atm_dev *dev, char signal)
241{
242 pr_debug("%s signal=%d dev=%p number=%d dev->signal=%d\n",
243 __func__, signal, dev, dev->number, dev->signal);
244
245 /* atm driver sending invalid signal */
246 WARN_ON(signal < ATM_PHY_SIG_LOST || signal > ATM_PHY_SIG_FOUND);
247
248 if (dev->signal == signal)
249 return; /* no change */
250
251 dev->signal = signal;
252
253 atomic_notifier_call_chain(&atm_dev_notify_chain, signal, dev);
254}
255EXPORT_SYMBOL(atm_dev_signal_change);
256
257void atm_dev_release_vccs(struct atm_dev *dev)
258{
259 int i;
260
261 write_lock_irq(&vcc_sklist_lock);
262 for (i = 0; i < VCC_HTABLE_SIZE; i++) {
263 struct hlist_head *head = &vcc_hash[i];
264 struct hlist_node *tmp;
265 struct sock *s;
266 struct atm_vcc *vcc;
267
268 sk_for_each_safe(s, tmp, head) {
269 vcc = atm_sk(s);
270 if (vcc->dev == dev) {
271 vcc_release_async(vcc, -EPIPE);
272 sk_del_node_init(s);
273 }
274 }
275 }
276 write_unlock_irq(&vcc_sklist_lock);
277}
278EXPORT_SYMBOL(atm_dev_release_vccs);
279
280static int adjust_tp(struct atm_trafprm *tp, unsigned char aal)
281{
282 int max_sdu;
283
284 if (!tp->traffic_class)
285 return 0;
286 switch (aal) {
287 case ATM_AAL0:
288 max_sdu = ATM_CELL_SIZE-1;
289 break;
290 default:
291 pr_warn("AAL problems ... (%d)\n", aal);
292 fallthrough;
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
305static 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 sock *s;
309 struct atm_vcc *walk;
310
311 sk_for_each(s, head) {
312 walk = atm_sk(s);
313 if (walk->dev != vcc->dev)
314 continue;
315 if (test_bit(ATM_VF_ADDR, &walk->flags) && walk->vpi == vpi &&
316 walk->vci == vci && ((walk->qos.txtp.traffic_class !=
317 ATM_NONE && vcc->qos.txtp.traffic_class != ATM_NONE) ||
318 (walk->qos.rxtp.traffic_class != ATM_NONE &&
319 vcc->qos.rxtp.traffic_class != ATM_NONE)))
320 return -EADDRINUSE;
321 }
322
323 /* allow VCCs with same VPI/VCI iff they don't collide on
324 TX/RX (but we may refuse such sharing for other reasons,
325 e.g. if protocol requires to have both channels) */
326
327 return 0;
328}
329
330static int find_ci(const struct atm_vcc *vcc, short *vpi, int *vci)
331{
332 static short p; /* poor man's per-device cache */
333 static int c;
334 short old_p;
335 int old_c;
336 int err;
337
338 if (*vpi != ATM_VPI_ANY && *vci != ATM_VCI_ANY) {
339 err = check_ci(vcc, *vpi, *vci);
340 return err;
341 }
342 /* last scan may have left values out of bounds for current device */
343 if (*vpi != ATM_VPI_ANY)
344 p = *vpi;
345 else if (p >= 1 << vcc->dev->ci_range.vpi_bits)
346 p = 0;
347 if (*vci != ATM_VCI_ANY)
348 c = *vci;
349 else if (c < ATM_NOT_RSV_VCI || c >= 1 << vcc->dev->ci_range.vci_bits)
350 c = ATM_NOT_RSV_VCI;
351 old_p = p;
352 old_c = c;
353 do {
354 if (!check_ci(vcc, p, c)) {
355 *vpi = p;
356 *vci = c;
357 return 0;
358 }
359 if (*vci == ATM_VCI_ANY) {
360 c++;
361 if (c >= 1 << vcc->dev->ci_range.vci_bits)
362 c = ATM_NOT_RSV_VCI;
363 }
364 if ((c == ATM_NOT_RSV_VCI || *vci != ATM_VCI_ANY) &&
365 *vpi == ATM_VPI_ANY) {
366 p++;
367 if (p >= 1 << vcc->dev->ci_range.vpi_bits)
368 p = 0;
369 }
370 } while (old_p != p || old_c != c);
371 return -EADDRINUSE;
372}
373
374static int __vcc_connect(struct atm_vcc *vcc, struct atm_dev *dev, short vpi,
375 int vci)
376{
377 struct sock *sk = sk_atm(vcc);
378 int error;
379
380 if ((vpi != ATM_VPI_UNSPEC && vpi != ATM_VPI_ANY &&
381 vpi >> dev->ci_range.vpi_bits) || (vci != ATM_VCI_UNSPEC &&
382 vci != ATM_VCI_ANY && vci >> dev->ci_range.vci_bits))
383 return -EINVAL;
384 if (vci > 0 && vci < ATM_NOT_RSV_VCI && !capable(CAP_NET_BIND_SERVICE))
385 return -EPERM;
386 error = -ENODEV;
387 if (!try_module_get(dev->ops->owner))
388 return error;
389 vcc->dev = dev;
390 write_lock_irq(&vcc_sklist_lock);
391 if (test_bit(ATM_DF_REMOVED, &dev->flags) ||
392 (error = find_ci(vcc, &vpi, &vci))) {
393 write_unlock_irq(&vcc_sklist_lock);
394 goto fail_module_put;
395 }
396 vcc->vpi = vpi;
397 vcc->vci = vci;
398 __vcc_insert_socket(sk);
399 write_unlock_irq(&vcc_sklist_lock);
400 switch (vcc->qos.aal) {
401 case ATM_AAL0:
402 error = atm_init_aal0(vcc);
403 vcc->stats = &dev->stats.aal0;
404 break;
405 case ATM_NO_AAL:
406 /* ATM_AAL5 is also used in the "0 for default" case */
407 vcc->qos.aal = ATM_AAL5;
408 fallthrough;
409 case ATM_AAL5:
410 error = atm_init_aal5(vcc);
411 vcc->stats = &dev->stats.aal5;
412 break;
413 default:
414 error = -EPROTOTYPE;
415 }
416 if (!error)
417 error = adjust_tp(&vcc->qos.txtp, vcc->qos.aal);
418 if (!error)
419 error = adjust_tp(&vcc->qos.rxtp, vcc->qos.aal);
420 if (error)
421 goto fail;
422 pr_debug("VCC %d.%d, AAL %d\n", vpi, vci, vcc->qos.aal);
423 pr_debug(" TX: %d, PCR %d..%d, SDU %d\n",
424 vcc->qos.txtp.traffic_class,
425 vcc->qos.txtp.min_pcr,
426 vcc->qos.txtp.max_pcr,
427 vcc->qos.txtp.max_sdu);
428 pr_debug(" RX: %d, PCR %d..%d, SDU %d\n",
429 vcc->qos.rxtp.traffic_class,
430 vcc->qos.rxtp.min_pcr,
431 vcc->qos.rxtp.max_pcr,
432 vcc->qos.rxtp.max_sdu);
433
434 if (dev->ops->open) {
435 error = dev->ops->open(vcc);
436 if (error)
437 goto fail;
438 }
439 return 0;
440
441fail:
442 vcc_remove_socket(sk);
443fail_module_put:
444 module_put(dev->ops->owner);
445 /* ensure we get dev module ref count correct */
446 vcc->dev = NULL;
447 return error;
448}
449
450int vcc_connect(struct socket *sock, int itf, short vpi, int vci)
451{
452 struct atm_dev *dev;
453 struct atm_vcc *vcc = ATM_SD(sock);
454 int error;
455
456 pr_debug("(vpi %d, vci %d)\n", vpi, vci);
457 if (sock->state == SS_CONNECTED)
458 return -EISCONN;
459 if (sock->state != SS_UNCONNECTED)
460 return -EINVAL;
461 if (!(vpi || vci))
462 return -EINVAL;
463
464 if (vpi != ATM_VPI_UNSPEC && vci != ATM_VCI_UNSPEC)
465 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
466 else
467 if (test_bit(ATM_VF_PARTIAL, &vcc->flags))
468 return -EINVAL;
469 pr_debug("(TX: cl %d,bw %d-%d,sdu %d; "
470 "RX: cl %d,bw %d-%d,sdu %d,AAL %s%d)\n",
471 vcc->qos.txtp.traffic_class, vcc->qos.txtp.min_pcr,
472 vcc->qos.txtp.max_pcr, vcc->qos.txtp.max_sdu,
473 vcc->qos.rxtp.traffic_class, vcc->qos.rxtp.min_pcr,
474 vcc->qos.rxtp.max_pcr, vcc->qos.rxtp.max_sdu,
475 vcc->qos.aal == ATM_AAL5 ? "" :
476 vcc->qos.aal == ATM_AAL0 ? "" : " ??? code ",
477 vcc->qos.aal == ATM_AAL0 ? 0 : vcc->qos.aal);
478 if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
479 return -EBADFD;
480 if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
481 vcc->qos.rxtp.traffic_class == ATM_ANYCLASS)
482 return -EINVAL;
483 if (likely(itf != ATM_ITF_ANY)) {
484 dev = try_then_request_module(atm_dev_lookup(itf),
485 "atm-device-%d", itf);
486 } else {
487 dev = NULL;
488 mutex_lock(&atm_dev_mutex);
489 if (!list_empty(&atm_devs)) {
490 dev = list_entry(atm_devs.next,
491 struct atm_dev, dev_list);
492 atm_dev_hold(dev);
493 }
494 mutex_unlock(&atm_dev_mutex);
495 }
496 if (!dev)
497 return -ENODEV;
498 error = __vcc_connect(vcc, dev, vpi, vci);
499 if (error) {
500 atm_dev_put(dev);
501 return error;
502 }
503 if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC)
504 set_bit(ATM_VF_PARTIAL, &vcc->flags);
505 if (test_bit(ATM_VF_READY, &ATM_SD(sock)->flags))
506 sock->state = SS_CONNECTED;
507 return 0;
508}
509
510int vcc_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
511 int flags)
512{
513 struct sock *sk = sock->sk;
514 struct atm_vcc *vcc;
515 struct sk_buff *skb;
516 int copied, error = -EINVAL;
517
518 if (sock->state != SS_CONNECTED)
519 return -ENOTCONN;
520
521 /* only handle MSG_DONTWAIT and MSG_PEEK */
522 if (flags & ~(MSG_DONTWAIT | MSG_PEEK))
523 return -EOPNOTSUPP;
524
525 vcc = ATM_SD(sock);
526 if (test_bit(ATM_VF_CLOSE, &vcc->flags) ||
527 !test_bit(ATM_VF_READY, &vcc->flags))
528 return 0;
529
530 skb = skb_recv_datagram(sk, flags, &error);
531 if (!skb)
532 return error;
533
534 copied = skb->len;
535 if (copied > size) {
536 copied = size;
537 msg->msg_flags |= MSG_TRUNC;
538 }
539
540 error = skb_copy_datagram_msg(skb, 0, msg, copied);
541 if (error)
542 return error;
543 sock_recv_cmsgs(msg, sk, skb);
544
545 if (!(flags & MSG_PEEK)) {
546 pr_debug("%d -= %d\n", atomic_read(&sk->sk_rmem_alloc),
547 skb->truesize);
548 atm_return(vcc, skb->truesize);
549 }
550
551 skb_free_datagram(sk, skb);
552 return copied;
553}
554
555int vcc_sendmsg(struct socket *sock, struct msghdr *m, size_t size)
556{
557 struct sock *sk = sock->sk;
558 DEFINE_WAIT(wait);
559 struct atm_vcc *vcc;
560 struct sk_buff *skb;
561 int eff, error;
562
563 lock_sock(sk);
564 if (sock->state != SS_CONNECTED) {
565 error = -ENOTCONN;
566 goto out;
567 }
568 if (m->msg_name) {
569 error = -EISCONN;
570 goto out;
571 }
572 vcc = ATM_SD(sock);
573 if (test_bit(ATM_VF_CLOSE, &vcc->flags) ||
574 !test_bit(ATM_VF_READY, &vcc->flags)) {
575 error = -EPIPE;
576 send_sig(SIGPIPE, current, 0);
577 goto out;
578 }
579 if (!size) {
580 error = 0;
581 goto out;
582 }
583 if (size > vcc->qos.txtp.max_sdu) {
584 error = -EMSGSIZE;
585 goto out;
586 }
587
588 eff = (size+3) & ~3; /* align to word boundary */
589 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
590 error = 0;
591 while (!vcc_tx_ready(vcc, eff)) {
592 if (m->msg_flags & MSG_DONTWAIT) {
593 error = -EAGAIN;
594 break;
595 }
596 schedule();
597 if (signal_pending(current)) {
598 error = -ERESTARTSYS;
599 break;
600 }
601 if (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 break;
606 }
607 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
608 }
609 finish_wait(sk_sleep(sk), &wait);
610 if (error)
611 goto out;
612
613 skb = alloc_skb(eff, GFP_KERNEL);
614 if (!skb) {
615 error = -ENOMEM;
616 goto out;
617 }
618 pr_debug("%d += %d\n", sk_wmem_alloc_get(sk), skb->truesize);
619 atm_account_tx(vcc, skb);
620
621 skb->dev = NULL; /* for paths shared with net_device interfaces */
622 if (!copy_from_iter_full(skb_put(skb, size), size, &m->msg_iter)) {
623 error = -EFAULT;
624 goto free_skb;
625 }
626 if (eff != size)
627 memset(skb->data + size, 0, eff-size);
628
629 error = vcc->dev->ops->send(vcc, skb);
630 error = error ? error : size;
631out:
632 release_sock(sk);
633 return error;
634free_skb:
635 atm_return_tx(vcc, skb);
636 kfree_skb(skb);
637 goto out;
638}
639
640__poll_t vcc_poll(struct file *file, struct socket *sock, poll_table *wait)
641{
642 struct sock *sk = sock->sk;
643 struct atm_vcc *vcc;
644 __poll_t mask;
645
646 sock_poll_wait(file, sock, wait);
647 mask = 0;
648
649 vcc = ATM_SD(sock);
650
651 /* exceptional events */
652 if (sk->sk_err)
653 mask = EPOLLERR;
654
655 if (test_bit(ATM_VF_CLOSE, &vcc->flags))
656 mask |= EPOLLHUP;
657
658 /* readable? */
659 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
660 mask |= EPOLLIN | EPOLLRDNORM;
661
662 /* writable? */
663 if (vcc->qos.txtp.traffic_class != ATM_NONE &&
664 vcc_writable(sk))
665 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
666
667 return mask;
668}
669
670static int check_tp(const struct atm_trafprm *tp)
671{
672 /* @@@ Should be merged with adjust_tp */
673 if (tp->traffic_class > ATM_ANYCLASS)
674 return -EINVAL;
675 if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS)
676 return 0;
677 if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr &&
678 !tp->max_pcr)
679 return -EINVAL;
680 if (tp->min_pcr == ATM_MAX_PCR)
681 return -EINVAL;
682 if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR &&
683 tp->min_pcr > tp->max_pcr)
684 return -EINVAL;
685 /*
686 * We allow pcr to be outside [min_pcr,max_pcr], because later
687 * adjustment may still push it in the valid range.
688 */
689 return 0;
690}
691
692static int check_qos(const struct atm_qos *qos)
693{
694 int error;
695
696 if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class)
697 return -EINVAL;
698 if (qos->txtp.traffic_class != qos->rxtp.traffic_class &&
699 qos->txtp.traffic_class && qos->rxtp.traffic_class &&
700 qos->txtp.traffic_class != ATM_ANYCLASS &&
701 qos->rxtp.traffic_class != ATM_ANYCLASS)
702 return -EINVAL;
703 error = check_tp(&qos->txtp);
704 if (error)
705 return error;
706 return check_tp(&qos->rxtp);
707}
708
709int vcc_setsockopt(struct socket *sock, int level, int optname,
710 sockptr_t optval, unsigned int optlen)
711{
712 struct atm_vcc *vcc;
713 int value;
714 int error;
715
716 if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname))
717 return -EINVAL;
718
719 vcc = ATM_SD(sock);
720 switch (optname) {
721 case SO_ATMQOS:
722 {
723 struct atm_qos qos;
724
725 error = copy_safe_from_sockptr(&qos, sizeof(qos), optval,
726 optlen);
727 if (error)
728 return error;
729 error = check_qos(&qos);
730 if (error)
731 return error;
732 /* QoS cannot be renegotiated on an already connected VCC. */
733 if (sock->state == SS_CONNECTED)
734 return -EOPNOTSUPP;
735 if (sock->state != SS_UNCONNECTED)
736 return -EBADFD;
737 vcc->qos = qos;
738 set_bit(ATM_VF_HASQOS, &vcc->flags);
739 return 0;
740 }
741 case SO_SETCLP:
742 error = copy_safe_from_sockptr(&value, sizeof(value), optval,
743 optlen);
744 if (error)
745 return error;
746 if (value)
747 vcc->atm_options |= ATM_ATMOPT_CLP;
748 else
749 vcc->atm_options &= ~ATM_ATMOPT_CLP;
750 return 0;
751 default:
752 return -EINVAL;
753 }
754}
755
756int vcc_getsockopt(struct socket *sock, int level, int optname,
757 sockopt_t *opt)
758{
759 struct atm_vcc *vcc;
760 int val;
761 int len;
762
763 len = opt->optlen;
764 if (__SO_LEVEL_MATCH(optname, level) && len != __SO_SIZE(optname))
765 return -EINVAL;
766
767 vcc = ATM_SD(sock);
768 switch (optname) {
769 case SO_ATMQOS:
770 if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
771 return -EINVAL;
772 return copy_to_iter(&vcc->qos, sizeof(vcc->qos),
773 &opt->iter_out) != sizeof(vcc->qos)
774 ? -EFAULT : 0;
775 case SO_SETCLP:
776 val = vcc->atm_options & ATM_ATMOPT_CLP ? 1 : 0;
777 return copy_to_iter(&val, sizeof(val), &opt->iter_out) !=
778 sizeof(val) ? -EFAULT : 0;
779 case SO_ATMPVC:
780 {
781 struct sockaddr_atmpvc pvc;
782
783 if (!vcc->dev || !test_bit(ATM_VF_ADDR, &vcc->flags))
784 return -ENOTCONN;
785 memset(&pvc, 0, sizeof(pvc));
786 pvc.sap_family = AF_ATMPVC;
787 pvc.sap_addr.itf = vcc->dev->number;
788 pvc.sap_addr.vpi = vcc->vpi;
789 pvc.sap_addr.vci = vcc->vci;
790 return copy_to_iter(&pvc, sizeof(pvc), &opt->iter_out) !=
791 sizeof(pvc) ? -EFAULT : 0;
792 }
793 default:
794 return -EINVAL;
795 }
796}
797
798int register_atmdevice_notifier(struct notifier_block *nb)
799{
800 return atomic_notifier_chain_register(&atm_dev_notify_chain, nb);
801}
802EXPORT_SYMBOL_GPL(register_atmdevice_notifier);
803
804void unregister_atmdevice_notifier(struct notifier_block *nb)
805{
806 atomic_notifier_chain_unregister(&atm_dev_notify_chain, nb);
807}
808EXPORT_SYMBOL_GPL(unregister_atmdevice_notifier);
809
810static int __init atm_init(void)
811{
812 int error;
813
814 error = proto_register(&vcc_proto, 0);
815 if (error < 0)
816 goto out;
817 error = atmpvc_init();
818 if (error < 0) {
819 pr_err("atmpvc_init() failed with %d\n", error);
820 goto out_unregister_vcc_proto;
821 }
822 error = atm_proc_init();
823 if (error < 0) {
824 pr_err("atm_proc_init() failed with %d\n", error);
825 goto out_atmpvc_exit;
826 }
827 error = atm_sysfs_init();
828 if (error < 0) {
829 pr_err("atm_sysfs_init() failed with %d\n", error);
830 goto out_atmproc_exit;
831 }
832out:
833 return error;
834out_atmproc_exit:
835 atm_proc_exit();
836out_atmpvc_exit:
837 atmpvc_exit();
838out_unregister_vcc_proto:
839 proto_unregister(&vcc_proto);
840 goto out;
841}
842
843static void __exit atm_exit(void)
844{
845 atm_proc_exit();
846 atm_sysfs_exit();
847 atmpvc_exit();
848 proto_unregister(&vcc_proto);
849}
850
851subsys_initcall(atm_init);
852
853module_exit(atm_exit);
854
855MODULE_DESCRIPTION("Asynchronous Transfer Mode (ATM) networking core");
856MODULE_LICENSE("GPL");
857MODULE_ALIAS_NETPROTO(PF_ATMPVC);