diff options
Diffstat (limited to '')
| -rw-r--r-- | net/atm/svc.c | 691 |
1 files changed, 691 insertions, 0 deletions
diff --git a/net/atm/svc.c b/net/atm/svc.c new file mode 100644 index 000000000..2f91b766a --- /dev/null +++ b/net/atm/svc.c @@ -0,0 +1,691 @@ +// SPDX-License-Identifier: GPL-2.0 +/* net/atm/svc.c - ATM SVC sockets */ + +/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ + +#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ + +#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/signal.h> +#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 <linux/uaccess.h> +#include <linux/export.h> + +#include "resources.h" +#include "common.h" /* common for PVCs and SVCs */ +#include "signaling.h" +#include "addr.h" + +static int svc_create(struct net *net, struct socket *sock, int protocol, + int kern); + +/* + * 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); + + pr_debug("%p\n", vcc); + if (test_bit(ATM_VF_REGIS, &vcc->flags)) { + sigd_enq(vcc, as_close, NULL, NULL, NULL); + for (;;) { + prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE); + if (test_bit(ATM_VF_RELEASED, &vcc->flags) || !sigd) + break; + schedule(); + } + finish_wait(sk_sleep(sk), &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); + pr_debug("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); + pr_debug("%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); + 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); + sigd_enq(vcc, as_bind, NULL, NULL, &vcc->local); + for (;;) { + prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE); + if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd) + break; + schedule(); + } + finish_wait(sk_sleep(sk), &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; + + pr_debug("%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); + sigd_enq(vcc, as_connect, NULL, NULL, &vcc->remote); + if (flags & O_NONBLOCK) { + sock->state = SS_CONNECTING; + error = -EINPROGRESS; + goto out; + } + error = 0; + prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); + while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) { + schedule(); + if (!signal_pending(current)) { + prepare_to_wait(sk_sleep(sk), &wait, + TASK_INTERRUPTIBLE); + continue; + } + pr_debug("*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_sleep(sk), &wait, + TASK_INTERRUPTIBLE); + schedule(); + } + if (!sk->sk_err) + while (!test_bit(ATM_VF_RELEASED, &vcc->flags) && + sigd) { + prepare_to_wait(sk_sleep(sk), &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_sleep(sk), &wait); + if (error) + goto out; + if (!sigd) { + error = -EUNATCH; + goto out; + } + if (sk->sk_err) { + error = -sk->sk_err; + goto out; + } + } + + vcc->qos.txtp.max_pcr = SELECT_TOP_PCR(vcc->qos.txtp); + vcc->qos.txtp.pcr = 0; + vcc->qos.txtp.min_pcr = 0; + + error = vcc_connect(sock, vcc->itf, vcc->vpi, vcc->vci); + if (!error) + 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; + + pr_debug("%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; + } + if (test_bit(ATM_VF_LISTEN, &vcc->flags)) { + error = -EADDRINUSE; + goto out; + } + set_bit(ATM_VF_WAITING, &vcc->flags); + sigd_enq(vcc, as_listen, NULL, NULL, &vcc->local); + for (;;) { + prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE); + if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd) + break; + schedule(); + } + finish_wait(sk_sleep(sk), &wait); + if (!sigd) { + error = -EUNATCH; + goto out; + } + set_bit(ATM_VF_LISTEN, &vcc->flags); + vcc_insert_socket(sk); + 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, + bool kern) +{ + 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(sock_net(sk), newsock, 0, kern); + if (error) + goto out; + + new_vcc = ATM_SD(newsock); + + pr_debug("%p -> %p\n", old_vcc, new_vcc); + while (1) { + DEFINE_WAIT(wait); + + prepare_to_wait(sk_sleep(sk), &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_sleep(sk), &wait, + TASK_INTERRUPTIBLE); + } + finish_wait(sk_sleep(sk), &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); + sigd_enq(new_vcc, as_accept, old_vcc, NULL, NULL); + for (;;) { + prepare_to_wait(sk_sleep(sk_atm(new_vcc)), &wait, + TASK_UNINTERRUPTIBLE); + if (!test_bit(ATM_VF_WAITING, &new_vcc->flags) || !sigd) + break; + release_sock(sk); + schedule(); + lock_sock(sk); + } + finish_wait(sk_sleep(sk_atm(new_vcc)), &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 peer) +{ + struct sockaddr_atmsvc *addr; + + addr = (struct sockaddr_atmsvc *) sockaddr; + memcpy(addr, peer ? &ATM_SD(sock)->remote : &ATM_SD(sock)->local, + sizeof(struct sockaddr_atmsvc)); + return sizeof(struct sockaddr_atmsvc); +} + +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); + sigd_enq2(vcc, as_modify, NULL, NULL, &vcc->local, qos, 0); + for (;;) { + prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE); + if (!test_bit(ATM_VF_WAITING, &vcc->flags) || + test_bit(ATM_VF_RELEASED, &vcc->flags) || !sigd) { + break; + } + schedule(); + } + finish_wait(sk_sleep(sk), &wait); + if (!sigd) + return -EUNATCH; + return -sk->sk_err; +} + +static int svc_setsockopt(struct socket *sock, int level, int optname, + char __user *optval, unsigned 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); + sigd_enq(vcc, as_addparty, NULL, NULL, + (struct sockaddr_atmsvc *) sockaddr); + if (flags & O_NONBLOCK) { + error = -EINPROGRESS; + goto out; + } + pr_debug("added wait queue\n"); + for (;;) { + prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); + if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd) + break; + schedule(); + } + finish_wait(sk_sleep(sk), &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); + sigd_enq2(vcc, as_dropparty, NULL, NULL, NULL, NULL, ep_ref); + for (;;) { + prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); + if (!test_bit(ATM_VF_WAITING, &vcc->flags) || !sigd) + break; + schedule(); + } + finish_wait(sk_sleep(sk), &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; +} + +#ifdef CONFIG_COMPAT +static int svc_compat_ioctl(struct socket *sock, unsigned int cmd, + unsigned long arg) +{ + /* The definition of ATM_ADDPARTY uses the size of struct atm_iobuf. + But actually it takes a struct sockaddr_atmsvc, which doesn't need + compat handling. So all we have to do is fix up cmd... */ + if (cmd == COMPAT_ATM_ADDPARTY) + cmd = ATM_ADDPARTY; + + if (cmd == ATM_ADDPARTY || cmd == ATM_DROPPARTY) + return svc_ioctl(sock, cmd, arg); + else + return vcc_compat_ioctl(sock, cmd, arg); +} +#endif /* CONFIG_COMPAT */ + +static const 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, +#ifdef CONFIG_COMPAT + .compat_ioctl = svc_compat_ioctl, +#endif + .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 net *net, struct socket *sock, int protocol, + int kern) +{ + int error; + + if (!net_eq(net, &init_net)) + return -EAFNOSUPPORT; + + sock->ops = &svc_proto_ops; + error = vcc_create(net, sock, protocol, AF_ATMSVC, kern); + if (error) + return error; + ATM_SD(sock)->local.sas_family = AF_ATMSVC; + ATM_SD(sock)->remote.sas_family = AF_ATMSVC; + return 0; +} + +static const 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); +} |