1 /* net/atm/common.c - ATM sockets (common part for PVC and SVC) */
3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
6 #include <linux/config.h>
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>
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 <net/sock.h> /* struct sock */
23 #include <asm/uaccess.h>
24 #include <asm/atomic.h>
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 */
36 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
38 #define DPRINTK(format,args...)
41 struct hlist_head vcc_hash[VCC_HTABLE_SIZE];
42 DEFINE_RWLOCK(vcc_sklist_lock);
44 static void __vcc_insert_socket(struct sock *sk)
46 struct atm_vcc *vcc = atm_sk(sk);
47 struct hlist_head *head = &vcc_hash[vcc->vci &
48 (VCC_HTABLE_SIZE - 1)];
49 sk->sk_hash = vcc->vci & (VCC_HTABLE_SIZE - 1);
50 sk_add_node(sk, head);
53 void vcc_insert_socket(struct sock *sk)
55 write_lock_irq(&vcc_sklist_lock);
56 __vcc_insert_socket(sk);
57 write_unlock_irq(&vcc_sklist_lock);
60 static void vcc_remove_socket(struct sock *sk)
62 write_lock_irq(&vcc_sklist_lock);
64 write_unlock_irq(&vcc_sklist_lock);
68 static struct sk_buff *alloc_tx(struct atm_vcc *vcc,unsigned int size)
71 struct sock *sk = sk_atm(vcc);
73 if (atomic_read(&sk->sk_wmem_alloc) && !atm_may_send(vcc, size)) {
74 DPRINTK("Sorry: wmem_alloc = %d, size = %d, sndbuf = %d\n",
75 atomic_read(&sk->sk_wmem_alloc), size,
79 while (!(skb = alloc_skb(size,GFP_KERNEL))) schedule();
80 DPRINTK("AlTx %d += %d\n", atomic_read(&sk->sk_wmem_alloc),
82 atomic_add(skb->truesize, &sk->sk_wmem_alloc);
87 EXPORT_SYMBOL(vcc_hash);
88 EXPORT_SYMBOL(vcc_sklist_lock);
89 EXPORT_SYMBOL(vcc_insert_socket);
91 static void vcc_sock_destruct(struct sock *sk)
93 if (atomic_read(&sk->sk_rmem_alloc))
94 printk(KERN_DEBUG "vcc_sock_destruct: rmem leakage (%d bytes) detected.\n", atomic_read(&sk->sk_rmem_alloc));
96 if (atomic_read(&sk->sk_wmem_alloc))
97 printk(KERN_DEBUG "vcc_sock_destruct: wmem leakage (%d bytes) detected.\n", atomic_read(&sk->sk_wmem_alloc));
100 static void vcc_def_wakeup(struct sock *sk)
102 read_lock(&sk->sk_callback_lock);
103 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
104 wake_up(sk->sk_sleep);
105 read_unlock(&sk->sk_callback_lock);
108 static inline int vcc_writable(struct sock *sk)
110 struct atm_vcc *vcc = atm_sk(sk);
112 return (vcc->qos.txtp.max_sdu +
113 atomic_read(&sk->sk_wmem_alloc)) <= sk->sk_sndbuf;
116 static void vcc_write_space(struct sock *sk)
118 read_lock(&sk->sk_callback_lock);
120 if (vcc_writable(sk)) {
121 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
122 wake_up_interruptible(sk->sk_sleep);
124 sk_wake_async(sk, 2, POLL_OUT);
127 read_unlock(&sk->sk_callback_lock);
130 static struct proto vcc_proto = {
132 .owner = THIS_MODULE,
133 .obj_size = sizeof(struct atm_vcc),
136 int vcc_create(struct socket *sock, int protocol, int family)
142 if (sock->type == SOCK_STREAM)
144 sk = sk_alloc(family, GFP_KERNEL, &vcc_proto, 1);
147 sock_init_data(sock, sk);
148 sk->sk_state_change = vcc_def_wakeup;
149 sk->sk_write_space = vcc_write_space;
153 memset(&vcc->local,0,sizeof(struct sockaddr_atmsvc));
154 memset(&vcc->remote,0,sizeof(struct sockaddr_atmsvc));
155 vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */
156 atomic_set(&sk->sk_wmem_alloc, 0);
157 atomic_set(&sk->sk_rmem_alloc, 0);
160 vcc->push_oam = NULL;
161 vcc->vpi = vcc->vci = 0; /* no VCI/VPI yet */
162 vcc->atm_options = vcc->aal_options = 0;
163 sk->sk_destruct = vcc_sock_destruct;
168 static void vcc_destroy_socket(struct sock *sk)
170 struct atm_vcc *vcc = atm_sk(sk);
173 set_bit(ATM_VF_CLOSE, &vcc->flags);
174 clear_bit(ATM_VF_READY, &vcc->flags);
176 if (vcc->dev->ops->close)
177 vcc->dev->ops->close(vcc);
179 vcc->push(vcc, NULL); /* atmarpd has no push */
181 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
182 atm_return(vcc,skb->truesize);
186 module_put(vcc->dev->ops->owner);
187 atm_dev_put(vcc->dev);
190 vcc_remove_socket(sk);
194 int vcc_release(struct socket *sock)
196 struct sock *sk = sock->sk;
200 vcc_destroy_socket(sock->sk);
209 void vcc_release_async(struct atm_vcc *vcc, int reply)
211 struct sock *sk = sk_atm(vcc);
213 set_bit(ATM_VF_CLOSE, &vcc->flags);
214 sk->sk_shutdown |= RCV_SHUTDOWN;
216 clear_bit(ATM_VF_WAITING, &vcc->flags);
217 sk->sk_state_change(sk);
221 EXPORT_SYMBOL(vcc_release_async);
224 static int adjust_tp(struct atm_trafprm *tp,unsigned char aal)
228 if (!tp->traffic_class) return 0;
231 max_sdu = ATM_CELL_SIZE-1;
234 max_sdu = ATM_MAX_AAL34_PDU;
237 printk(KERN_WARNING "ATM: AAL problems ... "
241 max_sdu = ATM_MAX_AAL5_PDU;
243 if (!tp->max_sdu) tp->max_sdu = max_sdu;
244 else if (tp->max_sdu > max_sdu) return -EINVAL;
245 if (!tp->max_cdv) tp->max_cdv = ATM_MAX_CDV;
250 static int check_ci(struct atm_vcc *vcc, short vpi, int vci)
252 struct hlist_head *head = &vcc_hash[vci &
253 (VCC_HTABLE_SIZE - 1)];
254 struct hlist_node *node;
256 struct atm_vcc *walk;
258 sk_for_each(s, node, head) {
260 if (walk->dev != vcc->dev)
262 if (test_bit(ATM_VF_ADDR, &walk->flags) && walk->vpi == vpi &&
263 walk->vci == vci && ((walk->qos.txtp.traffic_class !=
264 ATM_NONE && vcc->qos.txtp.traffic_class != ATM_NONE) ||
265 (walk->qos.rxtp.traffic_class != ATM_NONE &&
266 vcc->qos.rxtp.traffic_class != ATM_NONE)))
270 /* allow VCCs with same VPI/VCI iff they don't collide on
271 TX/RX (but we may refuse such sharing for other reasons,
272 e.g. if protocol requires to have both channels) */
278 static int find_ci(struct atm_vcc *vcc, short *vpi, int *vci)
280 static short p; /* poor man's per-device cache */
286 if (*vpi != ATM_VPI_ANY && *vci != ATM_VCI_ANY) {
287 err = check_ci(vcc, *vpi, *vci);
290 /* last scan may have left values out of bounds for current device */
291 if (*vpi != ATM_VPI_ANY)
293 else if (p >= 1 << vcc->dev->ci_range.vpi_bits)
295 if (*vci != ATM_VCI_ANY)
297 else if (c < ATM_NOT_RSV_VCI || c >= 1 << vcc->dev->ci_range.vci_bits)
302 if (!check_ci(vcc, p, c)) {
307 if (*vci == ATM_VCI_ANY) {
309 if (c >= 1 << vcc->dev->ci_range.vci_bits)
312 if ((c == ATM_NOT_RSV_VCI || *vci != ATM_VCI_ANY) &&
313 *vpi == ATM_VPI_ANY) {
315 if (p >= 1 << vcc->dev->ci_range.vpi_bits) p = 0;
318 while (old_p != p || old_c != c);
323 static int __vcc_connect(struct atm_vcc *vcc, struct atm_dev *dev, short vpi,
326 struct sock *sk = sk_atm(vcc);
329 if ((vpi != ATM_VPI_UNSPEC && vpi != ATM_VPI_ANY &&
330 vpi >> dev->ci_range.vpi_bits) || (vci != ATM_VCI_UNSPEC &&
331 vci != ATM_VCI_ANY && vci >> dev->ci_range.vci_bits))
333 if (vci > 0 && vci < ATM_NOT_RSV_VCI && !capable(CAP_NET_BIND_SERVICE))
336 if (!try_module_get(dev->ops->owner))
339 write_lock_irq(&vcc_sklist_lock);
340 if ((error = find_ci(vcc, &vpi, &vci))) {
341 write_unlock_irq(&vcc_sklist_lock);
342 goto fail_module_put;
346 __vcc_insert_socket(sk);
347 write_unlock_irq(&vcc_sklist_lock);
348 switch (vcc->qos.aal) {
350 error = atm_init_aal0(vcc);
351 vcc->stats = &dev->stats.aal0;
354 error = atm_init_aal34(vcc);
355 vcc->stats = &dev->stats.aal34;
358 /* ATM_AAL5 is also used in the "0 for default" case */
359 vcc->qos.aal = ATM_AAL5;
362 error = atm_init_aal5(vcc);
363 vcc->stats = &dev->stats.aal5;
368 if (!error) error = adjust_tp(&vcc->qos.txtp,vcc->qos.aal);
369 if (!error) error = adjust_tp(&vcc->qos.rxtp,vcc->qos.aal);
372 DPRINTK("VCC %d.%d, AAL %d\n",vpi,vci,vcc->qos.aal);
373 DPRINTK(" TX: %d, PCR %d..%d, SDU %d\n",vcc->qos.txtp.traffic_class,
374 vcc->qos.txtp.min_pcr,vcc->qos.txtp.max_pcr,vcc->qos.txtp.max_sdu);
375 DPRINTK(" RX: %d, PCR %d..%d, SDU %d\n",vcc->qos.rxtp.traffic_class,
376 vcc->qos.rxtp.min_pcr,vcc->qos.rxtp.max_pcr,vcc->qos.rxtp.max_sdu);
378 if (dev->ops->open) {
379 if ((error = dev->ops->open(vcc)))
385 vcc_remove_socket(sk);
387 module_put(dev->ops->owner);
388 /* ensure we get dev module ref count correct */
394 int vcc_connect(struct socket *sock, int itf, short vpi, int vci)
397 struct atm_vcc *vcc = ATM_SD(sock);
400 DPRINTK("vcc_connect (vpi %d, vci %d)\n",vpi,vci);
401 if (sock->state == SS_CONNECTED)
403 if (sock->state != SS_UNCONNECTED)
408 if (vpi != ATM_VPI_UNSPEC && vci != ATM_VCI_UNSPEC)
409 clear_bit(ATM_VF_PARTIAL,&vcc->flags);
411 if (test_bit(ATM_VF_PARTIAL,&vcc->flags))
413 DPRINTK("vcc_connect (TX: cl %d,bw %d-%d,sdu %d; "
414 "RX: cl %d,bw %d-%d,sdu %d,AAL %s%d)\n",
415 vcc->qos.txtp.traffic_class,vcc->qos.txtp.min_pcr,
416 vcc->qos.txtp.max_pcr,vcc->qos.txtp.max_sdu,
417 vcc->qos.rxtp.traffic_class,vcc->qos.rxtp.min_pcr,
418 vcc->qos.rxtp.max_pcr,vcc->qos.rxtp.max_sdu,
419 vcc->qos.aal == ATM_AAL5 ? "" : vcc->qos.aal == ATM_AAL0 ? "" :
420 " ??? code ",vcc->qos.aal == ATM_AAL0 ? 0 : vcc->qos.aal);
421 if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
423 if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
424 vcc->qos.rxtp.traffic_class == ATM_ANYCLASS)
426 if (likely(itf != ATM_ITF_ANY)) {
427 dev = try_then_request_module(atm_dev_lookup(itf), "atm-device-%d", itf);
430 down(&atm_dev_mutex);
431 if (!list_empty(&atm_devs)) {
432 dev = list_entry(atm_devs.next, struct atm_dev, dev_list);
439 error = __vcc_connect(vcc, dev, vpi, vci);
444 if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC)
445 set_bit(ATM_VF_PARTIAL,&vcc->flags);
446 if (test_bit(ATM_VF_READY,&ATM_SD(sock)->flags))
447 sock->state = SS_CONNECTED;
452 int vcc_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
453 size_t size, int flags)
455 struct sock *sk = sock->sk;
458 int copied, error = -EINVAL;
460 if (sock->state != SS_CONNECTED)
462 if (flags & ~MSG_DONTWAIT) /* only handle MSG_DONTWAIT */
465 if (test_bit(ATM_VF_RELEASED,&vcc->flags) ||
466 test_bit(ATM_VF_CLOSE,&vcc->flags) ||
467 !test_bit(ATM_VF_READY, &vcc->flags))
470 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &error);
477 msg->msg_flags |= MSG_TRUNC;
480 error = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
483 sock_recv_timestamp(msg, sk, skb);
484 DPRINTK("RcvM %d -= %d\n", atomic_read(&sk->rmem_alloc), skb->truesize);
485 atm_return(vcc, skb->truesize);
486 skb_free_datagram(sk, skb);
491 int vcc_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
494 struct sock *sk = sock->sk;
499 const void __user *buff;
503 if (sock->state != SS_CONNECTED) {
511 if (m->msg_iovlen != 1) {
512 error = -ENOSYS; /* fix this later @@@ */
515 buff = m->msg_iov->iov_base;
516 size = m->msg_iov->iov_len;
518 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
519 test_bit(ATM_VF_CLOSE, &vcc->flags) ||
520 !test_bit(ATM_VF_READY, &vcc->flags)) {
522 send_sig(SIGPIPE, current, 0);
529 if (size < 0 || size > vcc->qos.txtp.max_sdu) {
534 eff = (size+3) & ~3; /* align to word boundary */
535 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
537 while (!(skb = alloc_tx(vcc,eff))) {
538 if (m->msg_flags & MSG_DONTWAIT) {
543 if (signal_pending(current)) {
544 error = -ERESTARTSYS;
547 if (test_bit(ATM_VF_RELEASED,&vcc->flags) ||
548 test_bit(ATM_VF_CLOSE,&vcc->flags) ||
549 !test_bit(ATM_VF_READY,&vcc->flags)) {
551 send_sig(SIGPIPE, current, 0);
554 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
556 finish_wait(sk->sk_sleep, &wait);
559 skb->dev = NULL; /* for paths shared with net_device interfaces */
560 ATM_SKB(skb)->atm_options = vcc->atm_options;
561 if (copy_from_user(skb_put(skb,size),buff,size)) {
566 if (eff != size) memset(skb->data+size,0,eff-size);
567 error = vcc->dev->ops->send(vcc,skb);
568 error = error ? error : size;
575 unsigned int vcc_poll(struct file *file, struct socket *sock, poll_table *wait)
577 struct sock *sk = sock->sk;
581 poll_wait(file, sk->sk_sleep, wait);
586 /* exceptional events */
590 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
591 test_bit(ATM_VF_CLOSE, &vcc->flags))
595 if (!skb_queue_empty(&sk->sk_receive_queue))
596 mask |= POLLIN | POLLRDNORM;
599 if (sock->state == SS_CONNECTING &&
600 test_bit(ATM_VF_WAITING, &vcc->flags))
603 if (vcc->qos.txtp.traffic_class != ATM_NONE &&
605 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
611 static int atm_change_qos(struct atm_vcc *vcc,struct atm_qos *qos)
616 * Don't let the QoS change the already connected AAL type nor the
619 if (qos->aal != vcc->qos.aal ||
620 qos->rxtp.traffic_class != vcc->qos.rxtp.traffic_class ||
621 qos->txtp.traffic_class != vcc->qos.txtp.traffic_class)
623 error = adjust_tp(&qos->txtp,qos->aal);
624 if (!error) error = adjust_tp(&qos->rxtp,qos->aal);
625 if (error) return error;
626 if (!vcc->dev->ops->change_qos) return -EOPNOTSUPP;
627 if (sk_atm(vcc)->sk_family == AF_ATMPVC)
628 return vcc->dev->ops->change_qos(vcc,qos,ATM_MF_SET);
629 return svc_change_qos(vcc,qos);
633 static int check_tp(struct atm_trafprm *tp)
635 /* @@@ Should be merged with adjust_tp */
636 if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS) return 0;
637 if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr &&
638 !tp->max_pcr) return -EINVAL;
639 if (tp->min_pcr == ATM_MAX_PCR) return -EINVAL;
640 if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR &&
641 tp->min_pcr > tp->max_pcr) return -EINVAL;
643 * We allow pcr to be outside [min_pcr,max_pcr], because later
644 * adjustment may still push it in the valid range.
650 static int check_qos(struct atm_qos *qos)
654 if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class)
656 if (qos->txtp.traffic_class != qos->rxtp.traffic_class &&
657 qos->txtp.traffic_class && qos->rxtp.traffic_class &&
658 qos->txtp.traffic_class != ATM_ANYCLASS &&
659 qos->rxtp.traffic_class != ATM_ANYCLASS) return -EINVAL;
660 error = check_tp(&qos->txtp);
661 if (error) return error;
662 return check_tp(&qos->rxtp);
665 int vcc_setsockopt(struct socket *sock, int level, int optname,
666 char __user *optval, int optlen)
672 if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname))
681 if (copy_from_user(&qos,optval,sizeof(qos)))
683 error = check_qos(&qos);
684 if (error) return error;
685 if (sock->state == SS_CONNECTED)
686 return atm_change_qos(vcc,&qos);
687 if (sock->state != SS_UNCONNECTED)
690 set_bit(ATM_VF_HASQOS,&vcc->flags);
694 if (get_user(value,(unsigned long __user *)optval))
696 if (value) vcc->atm_options |= ATM_ATMOPT_CLP;
697 else vcc->atm_options &= ~ATM_ATMOPT_CLP;
700 if (level == SOL_SOCKET) return -EINVAL;
703 if (!vcc->dev || !vcc->dev->ops->setsockopt) return -EINVAL;
704 return vcc->dev->ops->setsockopt(vcc,level,optname,optval,optlen);
708 int vcc_getsockopt(struct socket *sock, int level, int optname,
709 char __user *optval, int __user *optlen)
714 if (get_user(len, optlen))
716 if (__SO_LEVEL_MATCH(optname, level) && len != __SO_SIZE(optname))
722 if (!test_bit(ATM_VF_HASQOS,&vcc->flags))
724 return copy_to_user(optval,&vcc->qos,sizeof(vcc->qos)) ?
727 return put_user(vcc->atm_options & ATM_ATMOPT_CLP ? 1 :
728 0,(unsigned long __user *)optval) ? -EFAULT : 0;
731 struct sockaddr_atmpvc pvc;
734 !test_bit(ATM_VF_ADDR,&vcc->flags))
736 pvc.sap_family = AF_ATMPVC;
737 pvc.sap_addr.itf = vcc->dev->number;
738 pvc.sap_addr.vpi = vcc->vpi;
739 pvc.sap_addr.vci = vcc->vci;
740 return copy_to_user(optval,&pvc,sizeof(pvc)) ?
744 if (level == SOL_SOCKET) return -EINVAL;
747 if (!vcc->dev || !vcc->dev->ops->getsockopt) return -EINVAL;
748 return vcc->dev->ops->getsockopt(vcc, level, optname, optval, len);
751 static int __init atm_init(void)
755 if ((error = proto_register(&vcc_proto, 0)) < 0)
758 if ((error = atmpvc_init()) < 0) {
759 printk(KERN_ERR "atmpvc_init() failed with %d\n", error);
760 goto out_unregister_vcc_proto;
762 if ((error = atmsvc_init()) < 0) {
763 printk(KERN_ERR "atmsvc_init() failed with %d\n", error);
764 goto out_atmpvc_exit;
766 if ((error = atm_proc_init()) < 0) {
767 printk(KERN_ERR "atm_proc_init() failed with %d\n",error);
768 goto out_atmsvc_exit;
776 out_unregister_vcc_proto:
777 proto_unregister(&vcc_proto);
781 static void __exit atm_exit(void)
786 proto_unregister(&vcc_proto);
789 module_init(atm_init);
790 module_exit(atm_exit);
792 MODULE_LICENSE("GPL");
793 MODULE_ALIAS_NETPROTO(PF_ATMPVC);
794 MODULE_ALIAS_NETPROTO(PF_ATMSVC);