1 // SPDX-License-Identifier: GPL-2.0-only
2 /* net/atm/common.c - ATM sockets (common part for PVC and SVC) */
4 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
6 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
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>
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>
27 #include <linux/atomic.h>
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 */
35 struct hlist_head vcc_hash[VCC_HTABLE_SIZE];
36 EXPORT_SYMBOL(vcc_hash);
38 DEFINE_RWLOCK(vcc_sklist_lock);
39 EXPORT_SYMBOL(vcc_sklist_lock);
41 static ATOMIC_NOTIFIER_HEAD(atm_dev_notify_chain);
43 static void __vcc_insert_socket(struct sock *sk)
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);
51 void vcc_insert_socket(struct sock *sk)
53 write_lock_irq(&vcc_sklist_lock);
54 __vcc_insert_socket(sk);
55 write_unlock_irq(&vcc_sklist_lock);
57 EXPORT_SYMBOL(vcc_insert_socket);
59 static void vcc_remove_socket(struct sock *sk)
61 write_lock_irq(&vcc_sklist_lock);
63 write_unlock_irq(&vcc_sklist_lock);
66 static bool vcc_tx_ready(struct atm_vcc *vcc, unsigned int size)
68 struct sock *sk = sk_atm(vcc);
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);
78 static void vcc_sock_destruct(struct sock *sk)
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));
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));
89 static void vcc_def_wakeup(struct sock *sk)
94 wq = rcu_dereference(sk->sk_wq);
95 if (skwq_has_sleeper(wq))
100 static inline int vcc_writable(struct sock *sk)
102 struct atm_vcc *vcc = atm_sk(sk);
104 return (vcc->qos.txtp.max_sdu +
105 refcount_read(&sk->sk_wmem_alloc)) <= sk->sk_sndbuf;
108 static void vcc_write_space(struct sock *sk)
110 struct socket_wq *wq;
114 if (vcc_writable(sk)) {
115 wq = rcu_dereference(sk->sk_wq);
116 if (skwq_has_sleeper(wq))
117 wake_up_interruptible(&wq->wait);
119 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
125 static void vcc_release_cb(struct sock *sk)
127 struct atm_vcc *vcc = atm_sk(sk);
130 vcc->release_cb(vcc);
133 static struct proto vcc_proto = {
135 .owner = THIS_MODULE,
136 .obj_size = sizeof(struct atm_vcc),
137 .release_cb = vcc_release_cb,
140 int vcc_create(struct net *net, struct socket *sock, int protocol, int family, int kern)
146 if (sock->type == SOCK_STREAM)
148 sk = sk_alloc(net, family, GFP_KERNEL, &vcc_proto, kern);
151 sock_init_data(sock, sk);
152 sk->sk_state_change = vcc_def_wakeup;
153 sk->sk_write_space = vcc_write_space;
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);
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;
173 static void vcc_destroy_socket(struct sock *sk)
175 struct atm_vcc *vcc = atm_sk(sk);
178 set_bit(ATM_VF_CLOSE, &vcc->flags);
179 clear_bit(ATM_VF_READY, &vcc->flags);
180 if (vcc->dev && vcc->dev->ops->close)
181 vcc->dev->ops->close(vcc);
183 vcc->push(vcc, NULL); /* atmarpd has no push */
184 module_put(vcc->owner);
186 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
187 atm_return(vcc, skb->truesize);
191 if (vcc->dev && vcc->dev->ops->owner) {
192 module_put(vcc->dev->ops->owner);
193 atm_dev_put(vcc->dev);
196 vcc_remove_socket(sk);
199 int vcc_release(struct socket *sock)
201 struct sock *sk = sock->sk;
205 vcc_destroy_socket(sock->sk);
213 void vcc_release_async(struct atm_vcc *vcc, int reply)
215 struct sock *sk = sk_atm(vcc);
217 set_bit(ATM_VF_CLOSE, &vcc->flags);
218 sk->sk_shutdown |= RCV_SHUTDOWN;
220 clear_bit(ATM_VF_WAITING, &vcc->flags);
221 sk->sk_state_change(sk);
223 EXPORT_SYMBOL(vcc_release_async);
225 void vcc_process_recv_queue(struct atm_vcc *vcc)
227 struct sk_buff_head queue, *rq;
228 struct sk_buff *skb, *tmp;
231 __skb_queue_head_init(&queue);
232 rq = &sk_atm(vcc)->sk_receive_queue;
234 spin_lock_irqsave(&rq->lock, flags);
235 skb_queue_splice_init(rq, &queue);
236 spin_unlock_irqrestore(&rq->lock, flags);
238 skb_queue_walk_safe(&queue, skb, tmp) {
239 __skb_unlink(skb, &queue);
243 EXPORT_SYMBOL(vcc_process_recv_queue);
245 void atm_dev_signal_change(struct atm_dev *dev, char signal)
247 pr_debug("%s signal=%d dev=%p number=%d dev->signal=%d\n",
248 __func__, signal, dev, dev->number, dev->signal);
250 /* atm driver sending invalid signal */
251 WARN_ON(signal < ATM_PHY_SIG_LOST || signal > ATM_PHY_SIG_FOUND);
253 if (dev->signal == signal)
254 return; /* no change */
256 dev->signal = signal;
258 atomic_notifier_call_chain(&atm_dev_notify_chain, signal, dev);
260 EXPORT_SYMBOL(atm_dev_signal_change);
262 void atm_dev_release_vccs(struct atm_dev *dev)
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;
273 sk_for_each_safe(s, tmp, head) {
275 if (vcc->dev == dev) {
276 vcc_release_async(vcc, -EPIPE);
281 write_unlock_irq(&vcc_sklist_lock);
283 EXPORT_SYMBOL(atm_dev_release_vccs);
285 static int adjust_tp(struct atm_trafprm *tp, unsigned char aal)
289 if (!tp->traffic_class)
293 max_sdu = ATM_CELL_SIZE-1;
296 max_sdu = ATM_MAX_AAL34_PDU;
299 pr_warn("AAL problems ... (%d)\n", aal);
302 max_sdu = ATM_MAX_AAL5_PDU;
305 tp->max_sdu = max_sdu;
306 else if (tp->max_sdu > max_sdu)
309 tp->max_cdv = ATM_MAX_CDV;
313 static int check_ci(const struct atm_vcc *vcc, short vpi, int vci)
315 struct hlist_head *head = &vcc_hash[vci & (VCC_HTABLE_SIZE - 1)];
317 struct atm_vcc *walk;
319 sk_for_each(s, head) {
321 if (walk->dev != vcc->dev)
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)))
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) */
338 static int find_ci(const struct atm_vcc *vcc, short *vpi, int *vci)
340 static short p; /* poor man's per-device cache */
346 if (*vpi != ATM_VPI_ANY && *vci != ATM_VCI_ANY) {
347 err = check_ci(vcc, *vpi, *vci);
350 /* last scan may have left values out of bounds for current device */
351 if (*vpi != ATM_VPI_ANY)
353 else if (p >= 1 << vcc->dev->ci_range.vpi_bits)
355 if (*vci != ATM_VCI_ANY)
357 else if (c < ATM_NOT_RSV_VCI || c >= 1 << vcc->dev->ci_range.vci_bits)
362 if (!check_ci(vcc, p, c)) {
367 if (*vci == ATM_VCI_ANY) {
369 if (c >= 1 << vcc->dev->ci_range.vci_bits)
372 if ((c == ATM_NOT_RSV_VCI || *vci != ATM_VCI_ANY) &&
373 *vpi == ATM_VPI_ANY) {
375 if (p >= 1 << vcc->dev->ci_range.vpi_bits)
378 } while (old_p != p || old_c != c);
382 static int __vcc_connect(struct atm_vcc *vcc, struct atm_dev *dev, short vpi,
385 struct sock *sk = sk_atm(vcc);
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))
392 if (vci > 0 && vci < ATM_NOT_RSV_VCI && !capable(CAP_NET_BIND_SERVICE))
395 if (!try_module_get(dev->ops->owner))
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;
406 __vcc_insert_socket(sk);
407 write_unlock_irq(&vcc_sklist_lock);
408 switch (vcc->qos.aal) {
410 error = atm_init_aal0(vcc);
411 vcc->stats = &dev->stats.aal0;
414 error = atm_init_aal34(vcc);
415 vcc->stats = &dev->stats.aal34;
418 /* ATM_AAL5 is also used in the "0 for default" case */
419 vcc->qos.aal = ATM_AAL5;
422 error = atm_init_aal5(vcc);
423 vcc->stats = &dev->stats.aal5;
429 error = adjust_tp(&vcc->qos.txtp, vcc->qos.aal);
431 error = adjust_tp(&vcc->qos.rxtp, vcc->qos.aal);
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);
446 if (dev->ops->open) {
447 error = dev->ops->open(vcc);
454 vcc_remove_socket(sk);
456 module_put(dev->ops->owner);
457 /* ensure we get dev module ref count correct */
462 int vcc_connect(struct socket *sock, int itf, short vpi, int vci)
465 struct atm_vcc *vcc = ATM_SD(sock);
468 pr_debug("(vpi %d, vci %d)\n", vpi, vci);
469 if (sock->state == SS_CONNECTED)
471 if (sock->state != SS_UNCONNECTED)
476 if (vpi != ATM_VPI_UNSPEC && vci != ATM_VCI_UNSPEC)
477 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
479 if (test_bit(ATM_VF_PARTIAL, &vcc->flags))
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))
492 if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
493 vcc->qos.rxtp.traffic_class == ATM_ANYCLASS)
495 if (likely(itf != ATM_ITF_ANY)) {
496 dev = try_then_request_module(atm_dev_lookup(itf),
497 "atm-device-%d", itf);
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);
506 mutex_unlock(&atm_dev_mutex);
510 error = __vcc_connect(vcc, dev, vpi, vci);
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;
522 int vcc_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
525 struct sock *sk = sock->sk;
528 int copied, error = -EINVAL;
530 if (sock->state != SS_CONNECTED)
533 /* only handle MSG_DONTWAIT and MSG_PEEK */
534 if (flags & ~(MSG_DONTWAIT | MSG_PEEK))
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))
543 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &error);
550 msg->msg_flags |= MSG_TRUNC;
553 error = skb_copy_datagram_msg(skb, 0, msg, copied);
556 sock_recv_ts_and_drops(msg, sk, skb);
558 if (!(flags & MSG_PEEK)) {
559 pr_debug("%d -= %d\n", atomic_read(&sk->sk_rmem_alloc),
561 atm_return(vcc, skb->truesize);
564 skb_free_datagram(sk, skb);
568 int vcc_sendmsg(struct socket *sock, struct msghdr *m, size_t size)
570 struct sock *sk = sock->sk;
577 if (sock->state != SS_CONNECTED) {
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)) {
590 send_sig(SIGPIPE, current, 0);
597 if (size > vcc->qos.txtp.max_sdu) {
602 eff = (size+3) & ~3; /* align to word boundary */
603 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
605 while (!vcc_tx_ready(vcc, eff)) {
606 if (m->msg_flags & MSG_DONTWAIT) {
611 if (signal_pending(current)) {
612 error = -ERESTARTSYS;
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)) {
619 send_sig(SIGPIPE, current, 0);
622 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
624 finish_wait(sk_sleep(sk), &wait);
628 skb = alloc_skb(eff, GFP_KERNEL);
633 pr_debug("%d += %d\n", sk_wmem_alloc_get(sk), skb->truesize);
634 atm_account_tx(vcc, skb);
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)) {
643 memset(skb->data + size, 0, eff-size);
644 error = vcc->dev->ops->send(vcc, skb);
645 error = error ? error : size;
651 __poll_t vcc_poll(struct file *file, struct socket *sock, poll_table *wait)
653 struct sock *sk = sock->sk;
657 sock_poll_wait(file, sock, wait);
662 /* exceptional events */
666 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
667 test_bit(ATM_VF_CLOSE, &vcc->flags))
671 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
672 mask |= EPOLLIN | EPOLLRDNORM;
675 if (sock->state == SS_CONNECTING &&
676 test_bit(ATM_VF_WAITING, &vcc->flags))
679 if (vcc->qos.txtp.traffic_class != ATM_NONE &&
681 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
686 static int atm_change_qos(struct atm_vcc *vcc, struct atm_qos *qos)
691 * Don't let the QoS change the already connected AAL type nor the
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)
698 error = adjust_tp(&qos->txtp, qos->aal);
700 error = adjust_tp(&qos->rxtp, qos->aal);
703 if (!vcc->dev->ops->change_qos)
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);
710 static int check_tp(const struct atm_trafprm *tp)
712 /* @@@ Should be merged with adjust_tp */
713 if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS)
715 if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr &&
718 if (tp->min_pcr == ATM_MAX_PCR)
720 if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR &&
721 tp->min_pcr > tp->max_pcr)
724 * We allow pcr to be outside [min_pcr,max_pcr], because later
725 * adjustment may still push it in the valid range.
730 static int check_qos(const struct atm_qos *qos)
734 if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class)
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)
741 error = check_tp(&qos->txtp);
744 return check_tp(&qos->rxtp);
747 int vcc_setsockopt(struct socket *sock, int level, int optname,
748 sockptr_t optval, unsigned int optlen)
754 if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname))
763 if (copy_from_sockptr(&qos, optval, sizeof(qos)))
765 error = check_qos(&qos);
768 if (sock->state == SS_CONNECTED)
769 return atm_change_qos(vcc, &qos);
770 if (sock->state != SS_UNCONNECTED)
773 set_bit(ATM_VF_HASQOS, &vcc->flags);
777 if (copy_from_sockptr(&value, optval, sizeof(value)))
780 vcc->atm_options |= ATM_ATMOPT_CLP;
782 vcc->atm_options &= ~ATM_ATMOPT_CLP;
789 int vcc_getsockopt(struct socket *sock, int level, int optname,
790 char __user *optval, int __user *optlen)
795 if (get_user(len, optlen))
797 if (__SO_LEVEL_MATCH(optname, level) && len != __SO_SIZE(optname))
803 if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
805 return copy_to_user(optval, &vcc->qos, sizeof(vcc->qos))
808 return put_user(vcc->atm_options & ATM_ATMOPT_CLP ? 1 : 0,
809 (unsigned long __user *)optval) ? -EFAULT : 0;
812 struct sockaddr_atmpvc pvc;
814 if (!vcc->dev || !test_bit(ATM_VF_ADDR, &vcc->flags))
816 memset(&pvc, 0, sizeof(pvc));
817 pvc.sap_family = AF_ATMPVC;
818 pvc.sap_addr.itf = vcc->dev->number;
819 pvc.sap_addr.vpi = vcc->vpi;
820 pvc.sap_addr.vci = vcc->vci;
821 return copy_to_user(optval, &pvc, sizeof(pvc)) ? -EFAULT : 0;
828 int register_atmdevice_notifier(struct notifier_block *nb)
830 return atomic_notifier_chain_register(&atm_dev_notify_chain, nb);
832 EXPORT_SYMBOL_GPL(register_atmdevice_notifier);
834 void unregister_atmdevice_notifier(struct notifier_block *nb)
836 atomic_notifier_chain_unregister(&atm_dev_notify_chain, nb);
838 EXPORT_SYMBOL_GPL(unregister_atmdevice_notifier);
840 static int __init atm_init(void)
844 error = proto_register(&vcc_proto, 0);
847 error = atmpvc_init();
849 pr_err("atmpvc_init() failed with %d\n", error);
850 goto out_unregister_vcc_proto;
852 error = atmsvc_init();
854 pr_err("atmsvc_init() failed with %d\n", error);
855 goto out_atmpvc_exit;
857 error = atm_proc_init();
859 pr_err("atm_proc_init() failed with %d\n", error);
860 goto out_atmsvc_exit;
862 error = atm_sysfs_init();
864 pr_err("atm_sysfs_init() failed with %d\n", error);
865 goto out_atmproc_exit;
875 out_unregister_vcc_proto:
876 proto_unregister(&vcc_proto);
880 static void __exit atm_exit(void)
886 proto_unregister(&vcc_proto);
889 subsys_initcall(atm_init);
891 module_exit(atm_exit);
893 MODULE_LICENSE("GPL");
894 MODULE_ALIAS_NETPROTO(PF_ATMPVC);
895 MODULE_ALIAS_NETPROTO(PF_ATMSVC);