diff options
Diffstat (limited to 'net/atm/svc.c')
| -rw-r--r-- | net/atm/svc.c | 674 |
1 files changed, 674 insertions, 0 deletions
diff --git a/net/atm/svc.c b/net/atm/svc.c new file mode 100644 index 00000000000..02f5374a51f --- /dev/null +++ b/net/atm/svc.c @@ -0,0 +1,674 @@ +/* net/atm/svc.c - ATM SVC sockets */ + +/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ + + +#include <linux/string.h> +#include <linux/net.h> /* struct socket, struct proto_ops */ +#include <linux/errno.h> /* error codes */ +#include <linux/kernel.h> /* printk */ +#include <linux/skbuff.h> +#include <linux/wait.h> +#include <linux/sched.h> /* jiffies and HZ */ +#include <linux/fcntl.h> /* O_NONBLOCK */ +#include <linux/init.h> +#include <linux/atm.h> /* ATM stuff */ +#include <linux/atmsap.h> +#include <linux/atmsvc.h> +#include <linux/atmdev.h> +#include <linux/bitops.h> +#include <net/sock.h> /* for sock_no_* */ +#include <asm/uaccess.h> + +#include "resources.h" +#include "common.h" /* common for PVCs and SVCs */ +#include "signaling.h" +#include "addr.h" + + +#if 0 +#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args) +#else +#define DPRINTK(format,args...) +#endif + + +static int svc_create(struct socket *sock,int protocol); + + +/* + * Note: since all this is still nicely synchronized with the signaling demon, + * there's no need to protect sleep loops with clis. If signaling is + * moved into the kernel, that would change. + */ + + +static int svc_shutdown(struct socket *sock,int how) +{ + return 0; +} + + +static void svc_disconnect(struct atm_vcc *vcc) +{ + DEFINE_WAIT(wait); + struct sk_buff *skb; + struct sock *sk = sk_atm(vcc); + + DPRINTK("svc_disconnect %p\n",vcc); + if (test_bit(ATM_VF_REGIS,&vcc->flags)) { + prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE); + sigd_enq(vcc,as_close,NULL,NULL,NULL); + while (!test_bit(ATM_VF_RELEASED,&vcc->flags) && sigd) { + schedule(); + prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE); + } + finish_wait(sk->sk_sleep, &wait); + } + /* beware - socket is still in use by atmsigd until the last + as_indicate has been answered */ + while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { + atm_return(vcc, skb->truesize); + DPRINTK("LISTEN REL\n"); + sigd_enq2(NULL,as_reject,vcc,NULL,NULL,&vcc->qos,0); + dev_kfree_skb(skb); + } + clear_bit(ATM_VF_REGIS, &vcc->flags); + /* ... may retry later */ +} + + +static int svc_release(struct socket *sock) +{ + struct sock *sk = sock->sk; + struct atm_vcc *vcc; + + if (sk) { + vcc = ATM_SD(sock); + DPRINTK("svc_release %p\n", vcc); + clear_bit(ATM_VF_READY, &vcc->flags); + /* VCC pointer is used as a reference, so we must not free it + (thereby subjecting it to re-use) before all pending connections + are closed */ + svc_disconnect(vcc); + vcc_release(sock); + } + return 0; +} + + +static int svc_bind(struct socket *sock,struct sockaddr *sockaddr, + int sockaddr_len) +{ + DEFINE_WAIT(wait); + struct sock *sk = sock->sk; + struct sockaddr_atmsvc *addr; + struct atm_vcc *vcc; + int error; + + if (sockaddr_len != sizeof(struct sockaddr_atmsvc)) + return -EINVAL; + lock_sock(sk); + if (sock->state == SS_CONNECTED) { + error = -EISCONN; + goto out; + } + if (sock->state != SS_UNCONNECTED) { + error = -EINVAL; + goto out; + } + vcc = ATM_SD(sock); + if (test_bit(ATM_VF_SESSION, &vcc->flags)) { + error = -EINVAL; + goto out; + } + addr = (struct sockaddr_atmsvc *) sockaddr; + if (addr->sas_family != AF_ATMSVC) { + error = -EAFNOSUPPORT; + goto out; + } + clear_bit(ATM_VF_BOUND,&vcc->flags); + /* failing rebind will kill old binding */ + /* @@@ check memory (de)allocation on rebind */ + if (!test_bit(ATM_VF_HASQOS,&vcc->flags)) { + error = -EBADFD; + goto out; + } + vcc->local = *addr; + set_bit(ATM_VF_WAITING, &vcc->flags); + prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE); + sigd_enq(vcc,as_bind,NULL,NULL,&vcc->local); + while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) { + schedule(); + prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE); + } + finish_wait(sk->sk_sleep, &wait); + clear_bit(ATM_VF_REGIS,&vcc->flags); /* doesn't count */ + if (!sigd) { + error = -EUNATCH; + goto out; + } + if (!sk->sk_err) + set_bit(ATM_VF_BOUND,&vcc->flags); + error = -sk->sk_err; +out: + release_sock(sk); + return error; +} + + +static int svc_connect(struct socket *sock,struct sockaddr *sockaddr, + int sockaddr_len,int flags) +{ + DEFINE_WAIT(wait); + struct sock *sk = sock->sk; + struct sockaddr_atmsvc *addr; + struct atm_vcc *vcc = ATM_SD(sock); + int error; + + DPRINTK("svc_connect %p\n",vcc); + lock_sock(sk); + if (sockaddr_len != sizeof(struct sockaddr_atmsvc)) { + error = -EINVAL; + goto out; + } + + switch (sock->state) { + default: + error = -EINVAL; + goto out; + case SS_CONNECTED: + error = -EISCONN; + goto out; + case SS_CONNECTING: + if (test_bit(ATM_VF_WAITING, &vcc->flags)) { + error = -EALREADY; + goto out; + } + sock->state = SS_UNCONNECTED; + if (sk->sk_err) { + error = -sk->sk_err; + goto out; + } + break; + case SS_UNCONNECTED: + addr = (struct sockaddr_atmsvc *) sockaddr; + if (addr->sas_family != AF_ATMSVC) { + error = -EAFNOSUPPORT; + goto out; + } + if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) { + error = -EBADFD; + goto out; + } + if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS || + vcc->qos.rxtp.traffic_class == ATM_ANYCLASS) { + error = -EINVAL; + goto out; + } + if (!vcc->qos.txtp.traffic_class && + !vcc->qos.rxtp.traffic_class) { + error = -EINVAL; + goto out; + } + vcc->remote = *addr; + set_bit(ATM_VF_WAITING, &vcc->flags); + prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); + sigd_enq(vcc,as_connect,NULL,NULL,&vcc->remote); + if (flags & O_NONBLOCK) { + finish_wait(sk->sk_sleep, &wait); + sock->state = SS_CONNECTING; + error = -EINPROGRESS; + goto out; + } + error = 0; + while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) { + schedule(); + if (!signal_pending(current)) { + prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); + continue; + } + DPRINTK("*ABORT*\n"); + /* + * This is tricky: + * Kernel ---close--> Demon + * Kernel <--close--- Demon + * or + * Kernel ---close--> Demon + * Kernel <--error--- Demon + * or + * Kernel ---close--> Demon + * Kernel <--okay---- Demon + * Kernel <--close--- Demon + */ + sigd_enq(vcc,as_close,NULL,NULL,NULL); + while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) { + prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); + schedule(); + } + if (!sk->sk_err) + while (!test_bit(ATM_VF_RELEASED,&vcc->flags) + && sigd) { + prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); + schedule(); + } + clear_bit(ATM_VF_REGIS,&vcc->flags); + clear_bit(ATM_VF_RELEASED,&vcc->flags); + clear_bit(ATM_VF_CLOSE,&vcc->flags); + /* we're gone now but may connect later */ + error = -EINTR; + break; + } + finish_wait(sk->sk_sleep, &wait); + if (error) + goto out; + if (!sigd) { + error = -EUNATCH; + goto out; + } + if (sk->sk_err) { + error = -sk->sk_err; + goto out; + } + } +/* + * Not supported yet + * + * #ifndef CONFIG_SINGLE_SIGITF + */ + vcc->qos.txtp.max_pcr = SELECT_TOP_PCR(vcc->qos.txtp); + vcc->qos.txtp.pcr = 0; + vcc->qos.txtp.min_pcr = 0; +/* + * #endif + */ + if (!(error = vcc_connect(sock, vcc->itf, vcc->vpi, vcc->vci))) + sock->state = SS_CONNECTED; + else + (void) svc_disconnect(vcc); +out: + release_sock(sk); + return error; +} + + +static int svc_listen(struct socket *sock,int backlog) +{ + DEFINE_WAIT(wait); + struct sock *sk = sock->sk; + struct atm_vcc *vcc = ATM_SD(sock); + int error; + + DPRINTK("svc_listen %p\n",vcc); + lock_sock(sk); + /* let server handle listen on unbound sockets */ + if (test_bit(ATM_VF_SESSION,&vcc->flags)) { + error = -EINVAL; + goto out; + } + set_bit(ATM_VF_WAITING, &vcc->flags); + prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE); + sigd_enq(vcc,as_listen,NULL,NULL,&vcc->local); + while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) { + schedule(); + prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE); + } + finish_wait(sk->sk_sleep, &wait); + if (!sigd) { + error = -EUNATCH; + goto out; + } + set_bit(ATM_VF_LISTEN,&vcc->flags); + sk->sk_max_ack_backlog = backlog > 0 ? backlog : ATM_BACKLOG_DEFAULT; + error = -sk->sk_err; +out: + release_sock(sk); + return error; +} + + +static int svc_accept(struct socket *sock,struct socket *newsock,int flags) +{ + struct sock *sk = sock->sk; + struct sk_buff *skb; + struct atmsvc_msg *msg; + struct atm_vcc *old_vcc = ATM_SD(sock); + struct atm_vcc *new_vcc; + int error; + + lock_sock(sk); + + error = svc_create(newsock,0); + if (error) + goto out; + + new_vcc = ATM_SD(newsock); + + DPRINTK("svc_accept %p -> %p\n",old_vcc,new_vcc); + while (1) { + DEFINE_WAIT(wait); + + prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); + while (!(skb = skb_dequeue(&sk->sk_receive_queue)) && + sigd) { + if (test_bit(ATM_VF_RELEASED,&old_vcc->flags)) break; + if (test_bit(ATM_VF_CLOSE,&old_vcc->flags)) { + error = -sk->sk_err; + break; + } + if (flags & O_NONBLOCK) { + error = -EAGAIN; + break; + } + release_sock(sk); + schedule(); + lock_sock(sk); + if (signal_pending(current)) { + error = -ERESTARTSYS; + break; + } + prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); + } + finish_wait(sk->sk_sleep, &wait); + if (error) + goto out; + if (!skb) { + error = -EUNATCH; + goto out; + } + msg = (struct atmsvc_msg *) skb->data; + new_vcc->qos = msg->qos; + set_bit(ATM_VF_HASQOS,&new_vcc->flags); + new_vcc->remote = msg->svc; + new_vcc->local = msg->local; + new_vcc->sap = msg->sap; + error = vcc_connect(newsock, msg->pvc.sap_addr.itf, + msg->pvc.sap_addr.vpi, msg->pvc.sap_addr.vci); + dev_kfree_skb(skb); + sk->sk_ack_backlog--; + if (error) { + sigd_enq2(NULL,as_reject,old_vcc,NULL,NULL, + &old_vcc->qos,error); + error = error == -EAGAIN ? -EBUSY : error; + goto out; + } + /* wait should be short, so we ignore the non-blocking flag */ + set_bit(ATM_VF_WAITING, &new_vcc->flags); + prepare_to_wait(sk_atm(new_vcc)->sk_sleep, &wait, TASK_UNINTERRUPTIBLE); + sigd_enq(new_vcc,as_accept,old_vcc,NULL,NULL); + while (test_bit(ATM_VF_WAITING, &new_vcc->flags) && sigd) { + release_sock(sk); + schedule(); + lock_sock(sk); + prepare_to_wait(sk_atm(new_vcc)->sk_sleep, &wait, TASK_UNINTERRUPTIBLE); + } + finish_wait(sk_atm(new_vcc)->sk_sleep, &wait); + if (!sigd) { + error = -EUNATCH; + goto out; + } + if (!sk_atm(new_vcc)->sk_err) + break; + if (sk_atm(new_vcc)->sk_err != ERESTARTSYS) { + error = -sk_atm(new_vcc)->sk_err; + goto out; + } + } + newsock->state = SS_CONNECTED; +out: + release_sock(sk); + return error; +} + + +static int svc_getname(struct socket *sock,struct sockaddr *sockaddr, + int *sockaddr_len,int peer) +{ + struct sockaddr_atmsvc *addr; + + *sockaddr_len = sizeof(struct sockaddr_atmsvc); + addr = (struct sockaddr_atmsvc *) sockaddr; + memcpy(addr,peer ? &ATM_SD(sock)->remote : &ATM_SD(sock)->local, + sizeof(struct sockaddr_atmsvc)); + return 0; +} + + +int svc_change_qos(struct atm_vcc *vcc,struct atm_qos *qos) +{ + struct sock *sk = sk_atm(vcc); + DEFINE_WAIT(wait); + + set_bit(ATM_VF_WAITING, &vcc->flags); + prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE); + sigd_enq2(vcc,as_modify,NULL,NULL,&vcc->local,qos,0); + while (test_bit(ATM_VF_WAITING, &vcc->flags) && + !test_bit(ATM_VF_RELEASED, &vcc->flags) && sigd) { + schedule(); + prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE); + } + finish_wait(sk->sk_sleep, &wait); + if (!sigd) return -EUNATCH; + return -sk->sk_err; +} + + +static int svc_setsockopt(struct socket *sock, int level, int optname, + char __user *optval, int optlen) +{ + struct sock *sk = sock->sk; + struct atm_vcc *vcc = ATM_SD(sock); + int value, error = 0; + + lock_sock(sk); + switch (optname) { + case SO_ATMSAP: + if (level != SOL_ATM || optlen != sizeof(struct atm_sap)) { + error = -EINVAL; + goto out; + } + if (copy_from_user(&vcc->sap, optval, optlen)) { + error = -EFAULT; + goto out; + } + set_bit(ATM_VF_HASSAP, &vcc->flags); + break; + case SO_MULTIPOINT: + if (level != SOL_ATM || optlen != sizeof(int)) { + error = -EINVAL; + goto out; + } + if (get_user(value, (int __user *) optval)) { + error = -EFAULT; + goto out; + } + if (value == 1) { + set_bit(ATM_VF_SESSION, &vcc->flags); + } else if (value == 0) { + clear_bit(ATM_VF_SESSION, &vcc->flags); + } else { + error = -EINVAL; + } + break; + default: + error = vcc_setsockopt(sock, level, optname, + optval, optlen); + } + +out: + release_sock(sk); + return error; +} + + +static int svc_getsockopt(struct socket *sock,int level,int optname, + char __user *optval,int __user *optlen) +{ + struct sock *sk = sock->sk; + int error = 0, len; + + lock_sock(sk); + if (!__SO_LEVEL_MATCH(optname, level) || optname != SO_ATMSAP) { + error = vcc_getsockopt(sock, level, optname, optval, optlen); + goto out; + } + if (get_user(len, optlen)) { + error = -EFAULT; + goto out; + } + if (len != sizeof(struct atm_sap)) { + error = -EINVAL; + goto out; + } + if (copy_to_user(optval, &ATM_SD(sock)->sap, sizeof(struct atm_sap))) { + error = -EFAULT; + goto out; + } +out: + release_sock(sk); + return error; +} + + +static int svc_addparty(struct socket *sock, struct sockaddr *sockaddr, + int sockaddr_len, int flags) +{ + DEFINE_WAIT(wait); + struct sock *sk = sock->sk; + struct atm_vcc *vcc = ATM_SD(sock); + int error; + + lock_sock(sk); + set_bit(ATM_VF_WAITING, &vcc->flags); + prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); + sigd_enq(vcc, as_addparty, NULL, NULL, + (struct sockaddr_atmsvc *) sockaddr); + if (flags & O_NONBLOCK) { + finish_wait(sk->sk_sleep, &wait); + error = -EINPROGRESS; + goto out; + } + DPRINTK("svc_addparty added wait queue\n"); + while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) { + schedule(); + prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); + } + finish_wait(sk->sk_sleep, &wait); + error = xchg(&sk->sk_err_soft, 0); +out: + release_sock(sk); + return error; +} + + +static int svc_dropparty(struct socket *sock, int ep_ref) +{ + DEFINE_WAIT(wait); + struct sock *sk = sock->sk; + struct atm_vcc *vcc = ATM_SD(sock); + int error; + + lock_sock(sk); + set_bit(ATM_VF_WAITING, &vcc->flags); + prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); + sigd_enq2(vcc, as_dropparty, NULL, NULL, NULL, NULL, ep_ref); + while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) { + schedule(); + prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); + } + finish_wait(sk->sk_sleep, &wait); + if (!sigd) { + error = -EUNATCH; + goto out; + } + error = xchg(&sk->sk_err_soft, 0); +out: + release_sock(sk); + return error; +} + + +static int svc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) +{ + int error, ep_ref; + struct sockaddr_atmsvc sa; + struct atm_vcc *vcc = ATM_SD(sock); + + switch (cmd) { + case ATM_ADDPARTY: + if (!test_bit(ATM_VF_SESSION, &vcc->flags)) + return -EINVAL; + if (copy_from_user(&sa, (void __user *) arg, sizeof(sa))) + return -EFAULT; + error = svc_addparty(sock, (struct sockaddr *) &sa, sizeof(sa), 0); + break; + case ATM_DROPPARTY: + if (!test_bit(ATM_VF_SESSION, &vcc->flags)) + return -EINVAL; + if (copy_from_user(&ep_ref, (void __user *) arg, sizeof(int))) + return -EFAULT; + error = svc_dropparty(sock, ep_ref); + break; + default: + error = vcc_ioctl(sock, cmd, arg); + } + + return error; +} + +static struct proto_ops svc_proto_ops = { + .family = PF_ATMSVC, + .owner = THIS_MODULE, + + .release = svc_release, + .bind = svc_bind, + .connect = svc_connect, + .socketpair = sock_no_socketpair, + .accept = svc_accept, + .getname = svc_getname, + .poll = vcc_poll, + .ioctl = svc_ioctl, + .listen = svc_listen, + .shutdown = svc_shutdown, + .setsockopt = svc_setsockopt, + .getsockopt = svc_getsockopt, + .sendmsg = vcc_sendmsg, + .recvmsg = vcc_recvmsg, + .mmap = sock_no_mmap, + .sendpage = sock_no_sendpage, +}; + + +static int svc_create(struct socket *sock,int protocol) +{ + int error; + + sock->ops = &svc_proto_ops; + error = vcc_create(sock, protocol, AF_ATMSVC); + if (error) return error; + ATM_SD(sock)->local.sas_family = AF_ATMSVC; + ATM_SD(sock)->remote.sas_family = AF_ATMSVC; + return 0; +} + + +static struct net_proto_family svc_family_ops = { + .family = PF_ATMSVC, + .create = svc_create, + .owner = THIS_MODULE, +}; + + +/* + * Initialize the ATM SVC protocol family + */ + +int __init atmsvc_init(void) +{ + return sock_register(&svc_family_ops); +} + +void atmsvc_exit(void) +{ + sock_unregister(PF_ATMSVC); +} |