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