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>
15 #include <linux/mm.h> /* verify_area */
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 rwlock_t vcc_sklist_lock = RW_LOCK_UNLOCKED;
44 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_hashent = 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)
72 if (atomic_read(&vcc->sk->sk_wmem_alloc) && !atm_may_send(vcc, size)) {
73 DPRINTK("Sorry: wmem_alloc = %d, size = %d, sndbuf = %d\n",
74 atomic_read(&vcc->sk->sk_wmem_alloc), size,
78 while (!(skb = alloc_skb(size,GFP_KERNEL))) schedule();
79 DPRINTK("AlTx %d += %d\n", atomic_read(&vcc->sk->sk_wmem_alloc),
81 atomic_add(skb->truesize, &vcc->sk->sk_wmem_alloc);
86 EXPORT_SYMBOL(vcc_hash);
87 EXPORT_SYMBOL(vcc_sklist_lock);
88 EXPORT_SYMBOL(vcc_insert_socket);
90 static void vcc_sock_destruct(struct sock *sk)
92 struct atm_vcc *vcc = atm_sk(sk);
94 if (atomic_read(&vcc->sk->sk_rmem_alloc))
95 printk(KERN_DEBUG "vcc_sock_destruct: rmem leakage (%d bytes) detected.\n", atomic_read(&sk->sk_rmem_alloc));
97 if (atomic_read(&vcc->sk->sk_wmem_alloc))
98 printk(KERN_DEBUG "vcc_sock_destruct: wmem leakage (%d bytes) detected.\n", atomic_read(&sk->sk_wmem_alloc));
100 kfree(sk->sk_protinfo);
103 static void vcc_def_wakeup(struct sock *sk)
105 read_lock(&sk->sk_callback_lock);
106 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
107 wake_up(sk->sk_sleep);
108 read_unlock(&sk->sk_callback_lock);
111 static inline int vcc_writable(struct sock *sk)
113 struct atm_vcc *vcc = atm_sk(sk);
115 return (vcc->qos.txtp.max_sdu +
116 atomic_read(&sk->sk_wmem_alloc)) <= sk->sk_sndbuf;
119 static void vcc_write_space(struct sock *sk)
121 read_lock(&sk->sk_callback_lock);
123 if (vcc_writable(sk)) {
124 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
125 wake_up_interruptible(sk->sk_sleep);
127 sk_wake_async(sk, 2, POLL_OUT);
130 read_unlock(&sk->sk_callback_lock);
134 int vcc_create(struct socket *sock, int protocol, int family)
140 if (sock->type == SOCK_STREAM)
142 sk = sk_alloc(family, GFP_KERNEL, 1, NULL);
145 sock_init_data(sock, sk);
146 sk_set_owner(sk, THIS_MODULE);
147 sk->sk_state_change = vcc_def_wakeup;
148 sk->sk_write_space = vcc_write_space;
150 vcc = sk->sk_protinfo = kmalloc(sizeof(*vcc), GFP_KERNEL);
156 memset(vcc, 0, sizeof(*vcc));
159 memset(&vcc->local,0,sizeof(struct sockaddr_atmsvc));
160 memset(&vcc->remote,0,sizeof(struct sockaddr_atmsvc));
161 vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */
162 atomic_set(&vcc->sk->sk_wmem_alloc, 0);
163 atomic_set(&vcc->sk->sk_rmem_alloc, 0);
166 vcc->push_oam = 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;
175 static void vcc_destroy_socket(struct sock *sk)
177 struct atm_vcc *vcc = atm_sk(sk);
180 clear_bit(ATM_VF_READY, &vcc->flags);
182 if (vcc->dev->ops->close)
183 vcc->dev->ops->close(vcc);
185 vcc->push(vcc, NULL); /* atmarpd has no push */
187 vcc_remove_socket(sk); /* no more receive */
189 while ((skb = skb_dequeue(&vcc->sk->sk_receive_queue)) != NULL) {
190 atm_return(vcc,skb->truesize);
194 module_put(vcc->dev->ops->owner);
195 atm_dev_put(vcc->dev);
200 int vcc_release(struct socket *sock)
202 struct sock *sk = sock->sk;
206 vcc_destroy_socket(sock->sk);
215 void vcc_release_async(struct atm_vcc *vcc, int reply)
217 set_bit(ATM_VF_CLOSE, &vcc->flags);
218 vcc->sk->sk_err = -reply;
219 clear_bit(ATM_VF_WAITING, &vcc->flags);
220 vcc->sk->sk_state_change(vcc->sk);
224 EXPORT_SYMBOL(vcc_release_async);
227 static int adjust_tp(struct atm_trafprm *tp,unsigned char aal)
231 if (!tp->traffic_class) return 0;
234 max_sdu = ATM_CELL_SIZE-1;
237 max_sdu = ATM_MAX_AAL34_PDU;
240 printk(KERN_WARNING "ATM: AAL problems ... "
244 max_sdu = ATM_MAX_AAL5_PDU;
246 if (!tp->max_sdu) tp->max_sdu = max_sdu;
247 else if (tp->max_sdu > max_sdu) return -EINVAL;
248 if (!tp->max_cdv) tp->max_cdv = ATM_MAX_CDV;
253 static int check_ci(struct atm_vcc *vcc, short vpi, int vci)
255 struct hlist_head *head = &vcc_hash[vci &
256 (VCC_HTABLE_SIZE - 1)];
257 struct hlist_node *node;
259 struct atm_vcc *walk;
261 sk_for_each(s, node, head) {
263 if (walk->dev != vcc->dev)
265 if (test_bit(ATM_VF_ADDR, &walk->flags) && walk->vpi == vpi &&
266 walk->vci == vci && ((walk->qos.txtp.traffic_class !=
267 ATM_NONE && vcc->qos.txtp.traffic_class != ATM_NONE) ||
268 (walk->qos.rxtp.traffic_class != ATM_NONE &&
269 vcc->qos.rxtp.traffic_class != ATM_NONE)))
273 /* allow VCCs with same VPI/VCI iff they don't collide on
274 TX/RX (but we may refuse such sharing for other reasons,
275 e.g. if protocol requires to have both channels) */
281 static int find_ci(struct atm_vcc *vcc, short *vpi, int *vci)
283 static short p; /* poor man's per-device cache */
289 if (*vpi != ATM_VPI_ANY && *vci != ATM_VCI_ANY) {
290 err = check_ci(vcc, *vpi, *vci);
293 /* last scan may have left values out of bounds for current device */
294 if (*vpi != ATM_VPI_ANY)
296 else if (p >= 1 << vcc->dev->ci_range.vpi_bits)
298 if (*vci != ATM_VCI_ANY)
300 else if (c < ATM_NOT_RSV_VCI || c >= 1 << vcc->dev->ci_range.vci_bits)
305 if (!check_ci(vcc, p, c)) {
310 if (*vci == ATM_VCI_ANY) {
312 if (c >= 1 << vcc->dev->ci_range.vci_bits)
315 if ((c == ATM_NOT_RSV_VCI || *vci != ATM_VCI_ANY) &&
316 *vpi == ATM_VPI_ANY) {
318 if (p >= 1 << vcc->dev->ci_range.vpi_bits) p = 0;
321 while (old_p != p || old_c != c);
326 static int __vcc_connect(struct atm_vcc *vcc, struct atm_dev *dev, short vpi,
331 if ((vpi != ATM_VPI_UNSPEC && vpi != ATM_VPI_ANY &&
332 vpi >> dev->ci_range.vpi_bits) || (vci != ATM_VCI_UNSPEC &&
333 vci != ATM_VCI_ANY && vci >> dev->ci_range.vci_bits))
335 if (vci > 0 && vci < ATM_NOT_RSV_VCI && !capable(CAP_NET_BIND_SERVICE))
338 if (!try_module_get(dev->ops->owner))
341 write_lock_irq(&vcc_sklist_lock);
342 if ((error = find_ci(vcc, &vpi, &vci))) {
343 write_unlock_irq(&vcc_sklist_lock);
344 goto fail_module_put;
348 __vcc_insert_socket(vcc->sk);
349 write_unlock_irq(&vcc_sklist_lock);
350 switch (vcc->qos.aal) {
352 error = atm_init_aal0(vcc);
353 vcc->stats = &dev->stats.aal0;
356 error = atm_init_aal34(vcc);
357 vcc->stats = &dev->stats.aal34;
360 /* ATM_AAL5 is also used in the "0 for default" case */
361 vcc->qos.aal = ATM_AAL5;
364 error = atm_init_aal5(vcc);
365 vcc->stats = &dev->stats.aal5;
370 if (!error) error = adjust_tp(&vcc->qos.txtp,vcc->qos.aal);
371 if (!error) error = adjust_tp(&vcc->qos.rxtp,vcc->qos.aal);
374 DPRINTK("VCC %d.%d, AAL %d\n",vpi,vci,vcc->qos.aal);
375 DPRINTK(" TX: %d, PCR %d..%d, SDU %d\n",vcc->qos.txtp.traffic_class,
376 vcc->qos.txtp.min_pcr,vcc->qos.txtp.max_pcr,vcc->qos.txtp.max_sdu);
377 DPRINTK(" RX: %d, PCR %d..%d, SDU %d\n",vcc->qos.rxtp.traffic_class,
378 vcc->qos.rxtp.min_pcr,vcc->qos.rxtp.max_pcr,vcc->qos.rxtp.max_sdu);
380 if (dev->ops->open) {
381 if ((error = dev->ops->open(vcc)))
387 vcc_remove_socket(vcc->sk);
389 module_put(dev->ops->owner);
390 /* ensure we get dev module ref count correct */
396 int vcc_connect(struct socket *sock, int itf, short vpi, int vci)
399 struct atm_vcc *vcc = ATM_SD(sock);
402 DPRINTK("vcc_connect (vpi %d, vci %d)\n",vpi,vci);
403 if (sock->state == SS_CONNECTED)
405 if (sock->state != SS_UNCONNECTED)
410 if (vpi != ATM_VPI_UNSPEC && vci != ATM_VCI_UNSPEC)
411 clear_bit(ATM_VF_PARTIAL,&vcc->flags);
413 if (test_bit(ATM_VF_PARTIAL,&vcc->flags))
415 DPRINTK("vcc_connect (TX: cl %d,bw %d-%d,sdu %d; "
416 "RX: cl %d,bw %d-%d,sdu %d,AAL %s%d)\n",
417 vcc->qos.txtp.traffic_class,vcc->qos.txtp.min_pcr,
418 vcc->qos.txtp.max_pcr,vcc->qos.txtp.max_sdu,
419 vcc->qos.rxtp.traffic_class,vcc->qos.rxtp.min_pcr,
420 vcc->qos.rxtp.max_pcr,vcc->qos.rxtp.max_sdu,
421 vcc->qos.aal == ATM_AAL5 ? "" : vcc->qos.aal == ATM_AAL0 ? "" :
422 " ??? code ",vcc->qos.aal == ATM_AAL0 ? 0 : vcc->qos.aal);
423 if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
425 if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
426 vcc->qos.rxtp.traffic_class == ATM_ANYCLASS)
428 if (itf != ATM_ITF_ANY) {
429 dev = atm_dev_lookup(itf);
432 error = __vcc_connect(vcc, dev, vpi, vci);
438 struct list_head *p, *next;
441 spin_lock(&atm_dev_lock);
442 list_for_each_safe(p, next, &atm_devs) {
443 dev = list_entry(p, struct atm_dev, dev_list);
445 spin_unlock(&atm_dev_lock);
446 if (!__vcc_connect(vcc, dev, vpi, vci))
450 spin_lock(&atm_dev_lock);
452 spin_unlock(&atm_dev_lock);
456 if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC)
457 set_bit(ATM_VF_PARTIAL,&vcc->flags);
458 if (test_bit(ATM_VF_READY,&ATM_SD(sock)->flags))
459 sock->state = SS_CONNECTED;
464 int vcc_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
465 size_t size, int flags)
467 struct sock *sk = sock->sk;
470 int copied, error = -EINVAL;
472 if (sock->state != SS_CONNECTED)
474 if (flags & ~MSG_DONTWAIT) /* only handle MSG_DONTWAIT */
477 if (test_bit(ATM_VF_RELEASED,&vcc->flags) ||
478 test_bit(ATM_VF_CLOSE,&vcc->flags) ||
479 !test_bit(ATM_VF_READY, &vcc->flags))
482 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &error);
489 msg->msg_flags |= MSG_TRUNC;
492 error = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
495 sock_recv_timestamp(msg, sk, skb);
496 DPRINTK("RcvM %d -= %d\n", atomic_read(&vcc->sk->rmem_alloc), skb->truesize);
497 atm_return(vcc, skb->truesize);
498 skb_free_datagram(sk, skb);
503 int vcc_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
506 struct sock *sk = sock->sk;
511 const void __user *buff;
515 if (sock->state != SS_CONNECTED) {
523 if (m->msg_iovlen != 1) {
524 error = -ENOSYS; /* fix this later @@@ */
527 buff = m->msg_iov->iov_base;
528 size = m->msg_iov->iov_len;
530 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
531 test_bit(ATM_VF_CLOSE, &vcc->flags) ||
532 !test_bit(ATM_VF_READY, &vcc->flags)) {
534 send_sig(SIGPIPE, current, 0);
541 if (size < 0 || size > vcc->qos.txtp.max_sdu) {
545 /* verify_area is done by net/socket.c */
546 eff = (size+3) & ~3; /* align to word boundary */
547 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
549 while (!(skb = alloc_tx(vcc,eff))) {
550 if (m->msg_flags & MSG_DONTWAIT) {
555 if (signal_pending(current)) {
556 error = -ERESTARTSYS;
559 if (test_bit(ATM_VF_RELEASED,&vcc->flags) ||
560 test_bit(ATM_VF_CLOSE,&vcc->flags) ||
561 !test_bit(ATM_VF_READY,&vcc->flags)) {
563 send_sig(SIGPIPE, current, 0);
566 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
568 finish_wait(sk->sk_sleep, &wait);
571 skb->dev = NULL; /* for paths shared with net_device interfaces */
572 ATM_SKB(skb)->atm_options = vcc->atm_options;
573 if (copy_from_user(skb_put(skb,size),buff,size)) {
578 if (eff != size) memset(skb->data+size,0,eff-size);
579 error = vcc->dev->ops->send(vcc,skb);
580 error = error ? error : size;
587 unsigned int vcc_poll(struct file *file, struct socket *sock, poll_table *wait)
589 struct sock *sk = sock->sk;
593 poll_wait(file, sk->sk_sleep, wait);
598 /* exceptional events */
602 if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
603 test_bit(ATM_VF_CLOSE, &vcc->flags))
607 if (!skb_queue_empty(&sk->sk_receive_queue))
608 mask |= POLLIN | POLLRDNORM;
611 if (sock->state == SS_CONNECTING &&
612 test_bit(ATM_VF_WAITING, &vcc->flags))
615 if (vcc->qos.txtp.traffic_class != ATM_NONE &&
616 vcc_writable(vcc->sk))
617 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
623 static int atm_change_qos(struct atm_vcc *vcc,struct atm_qos *qos)
628 * Don't let the QoS change the already connected AAL type nor the
631 if (qos->aal != vcc->qos.aal ||
632 qos->rxtp.traffic_class != vcc->qos.rxtp.traffic_class ||
633 qos->txtp.traffic_class != vcc->qos.txtp.traffic_class)
635 error = adjust_tp(&qos->txtp,qos->aal);
636 if (!error) error = adjust_tp(&qos->rxtp,qos->aal);
637 if (error) return error;
638 if (!vcc->dev->ops->change_qos) return -EOPNOTSUPP;
639 if (vcc->sk->sk_family == AF_ATMPVC)
640 return vcc->dev->ops->change_qos(vcc,qos,ATM_MF_SET);
641 return svc_change_qos(vcc,qos);
645 static int check_tp(struct atm_trafprm *tp)
647 /* @@@ Should be merged with adjust_tp */
648 if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS) return 0;
649 if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr &&
650 !tp->max_pcr) return -EINVAL;
651 if (tp->min_pcr == ATM_MAX_PCR) return -EINVAL;
652 if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR &&
653 tp->min_pcr > tp->max_pcr) return -EINVAL;
655 * We allow pcr to be outside [min_pcr,max_pcr], because later
656 * adjustment may still push it in the valid range.
662 static int check_qos(struct atm_qos *qos)
666 if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class)
668 if (qos->txtp.traffic_class != qos->rxtp.traffic_class &&
669 qos->txtp.traffic_class && qos->rxtp.traffic_class &&
670 qos->txtp.traffic_class != ATM_ANYCLASS &&
671 qos->rxtp.traffic_class != ATM_ANYCLASS) return -EINVAL;
672 error = check_tp(&qos->txtp);
673 if (error) return error;
674 return check_tp(&qos->rxtp);
677 int vcc_setsockopt(struct socket *sock, int level, int optname,
678 char __user *optval, int optlen)
684 if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname))
693 if (copy_from_user(&qos,optval,sizeof(qos)))
695 error = check_qos(&qos);
696 if (error) return error;
697 if (sock->state == SS_CONNECTED)
698 return atm_change_qos(vcc,&qos);
699 if (sock->state != SS_UNCONNECTED)
702 set_bit(ATM_VF_HASQOS,&vcc->flags);
706 if (get_user(value,(unsigned long __user *)optval))
708 if (value) vcc->atm_options |= ATM_ATMOPT_CLP;
709 else vcc->atm_options &= ~ATM_ATMOPT_CLP;
712 if (level == SOL_SOCKET) return -EINVAL;
715 if (!vcc->dev || !vcc->dev->ops->setsockopt) return -EINVAL;
716 return vcc->dev->ops->setsockopt(vcc,level,optname,optval,optlen);
720 int vcc_getsockopt(struct socket *sock, int level, int optname,
721 char __user *optval, int __user *optlen)
726 if (get_user(len, optlen))
728 if (__SO_LEVEL_MATCH(optname, level) && len != __SO_SIZE(optname))
734 if (!test_bit(ATM_VF_HASQOS,&vcc->flags))
736 return copy_to_user(optval,&vcc->qos,sizeof(vcc->qos)) ?
739 return put_user(vcc->atm_options & ATM_ATMOPT_CLP ? 1 :
740 0,(unsigned long __user *)optval) ? -EFAULT : 0;
743 struct sockaddr_atmpvc pvc;
746 !test_bit(ATM_VF_ADDR,&vcc->flags))
748 pvc.sap_family = AF_ATMPVC;
749 pvc.sap_addr.itf = vcc->dev->number;
750 pvc.sap_addr.vpi = vcc->vpi;
751 pvc.sap_addr.vci = vcc->vci;
752 return copy_to_user(optval,&pvc,sizeof(pvc)) ?
756 if (level == SOL_SOCKET) return -EINVAL;
759 if (!vcc->dev || !vcc->dev->ops->getsockopt) return -EINVAL;
760 return vcc->dev->ops->getsockopt(vcc, level, optname, optval, len);
764 #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
765 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
767 struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
768 unsigned char *addr) = NULL;
769 void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent) = NULL;
770 #if defined(CONFIG_ATM_LANE_MODULE) || defined(CONFIG_BRIDGE_MODULE)
771 EXPORT_SYMBOL(br_fdb_get_hook);
772 EXPORT_SYMBOL(br_fdb_put_hook);
773 #endif /* defined(CONFIG_ATM_LANE_MODULE) || defined(CONFIG_BRIDGE_MODULE) */
774 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
775 #endif /* defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE) */
778 static int __init atm_init(void)
782 if ((error = atmpvc_init()) < 0) {
783 printk(KERN_ERR "atmpvc_init() failed with %d\n", error);
786 if ((error = atmsvc_init()) < 0) {
787 printk(KERN_ERR "atmsvc_init() failed with %d\n", error);
790 if ((error = atm_proc_init()) < 0) {
791 printk(KERN_ERR "atm_proc_init() failed with %d\n",error);
802 static void __exit atm_exit(void)
809 module_init(atm_init);
810 module_exit(atm_exit);
812 MODULE_LICENSE("GPL");
813 MODULE_ALIAS_NETPROTO(PF_ATMPVC);
814 MODULE_ALIAS_NETPROTO(PF_ATMSVC);