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/* ATM ioctl handling */
/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
/* 2003 John Levon <levon@movementarian.org> */
#include <linux/module.h>
#include <linux/kmod.h>
#include <linux/net.h> /* struct socket, struct proto_ops */
#include <linux/atm.h> /* ATM stuff */
#include <linux/atmdev.h>
#include <linux/atmclip.h> /* CLIP_*ENCAP */
#include <linux/atmarp.h> /* manifest constants */
#include <linux/capability.h>
#include <linux/sonet.h> /* for ioctls */
#include <linux/atmsvc.h>
#include <linux/atmmpc.h>
#include <net/atmclip.h>
#include <linux/atmlec.h>
#include <linux/mutex.h>
#include <asm/ioctls.h>
#include "resources.h"
#include "signaling.h" /* for WAITING and sigd_attach */
#include "common.h"
static DEFINE_MUTEX(ioctl_mutex);
static LIST_HEAD(ioctl_list);
void register_atm_ioctl(struct atm_ioctl *ioctl)
{
mutex_lock(&ioctl_mutex);
list_add_tail(&ioctl->list, &ioctl_list);
mutex_unlock(&ioctl_mutex);
}
void deregister_atm_ioctl(struct atm_ioctl *ioctl)
{
mutex_lock(&ioctl_mutex);
list_del(&ioctl->list);
mutex_unlock(&ioctl_mutex);
}
EXPORT_SYMBOL(register_atm_ioctl);
EXPORT_SYMBOL(deregister_atm_ioctl);
int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
struct sock *sk = sock->sk;
struct atm_vcc *vcc;
int error;
struct list_head * pos;
void __user *argp = (void __user *)arg;
vcc = ATM_SD(sock);
switch (cmd) {
case SIOCOUTQ:
if (sock->state != SS_CONNECTED ||
!test_bit(ATM_VF_READY, &vcc->flags)) {
error = -EINVAL;
goto done;
}
error = put_user(sk->sk_sndbuf -
atomic_read(&sk->sk_wmem_alloc),
(int __user *) argp) ? -EFAULT : 0;
goto done;
case SIOCINQ:
{
struct sk_buff *skb;
if (sock->state != SS_CONNECTED) {
error = -EINVAL;
goto done;
}
skb = skb_peek(&sk->sk_receive_queue);
error = put_user(skb ? skb->len : 0,
(int __user *)argp) ? -EFAULT : 0;
goto done;
}
case SIOCGSTAMP: /* borrowed from IP */
error = sock_get_timestamp(sk, argp);
goto done;
case SIOCGSTAMPNS: /* borrowed from IP */
error = sock_get_timestampns(sk, argp);
goto done;
case ATM_SETSC:
printk(KERN_WARNING "ATM_SETSC is obsolete\n");
error = 0;
goto done;
case ATMSIGD_CTRL:
if (!capable(CAP_NET_ADMIN)) {
error = -EPERM;
goto done;
}
/*
* The user/kernel protocol for exchanging signalling
* info uses kernel pointers as opaque references,
* so the holder of the file descriptor can scribble
* on the kernel... so we should make sure that we
* have the same privledges that /proc/kcore needs
*/
if (!capable(CAP_SYS_RAWIO)) {
error = -EPERM;
goto done;
}
error = sigd_attach(vcc);
if (!error)
sock->state = SS_CONNECTED;
goto done;
case ATM_SETBACKEND:
case ATM_NEWBACKENDIF:
{
atm_backend_t backend;
error = get_user(backend, (atm_backend_t __user *) argp);
if (error)
goto done;
switch (backend) {
case ATM_BACKEND_PPP:
request_module("pppoatm");
break;
case ATM_BACKEND_BR2684:
request_module("br2684");
break;
}
}
break;
case ATMMPC_CTRL:
case ATMMPC_DATA:
request_module("mpoa");
break;
case ATMARPD_CTRL:
request_module("clip");
break;
case ATMLEC_CTRL:
request_module("lec");
break;
}
error = -ENOIOCTLCMD;
mutex_lock(&ioctl_mutex);
list_for_each(pos, &ioctl_list) {
struct atm_ioctl * ic = list_entry(pos, struct atm_ioctl, list);
if (try_module_get(ic->owner)) {
error = ic->ioctl(sock, cmd, arg);
module_put(ic->owner);
if (error != -ENOIOCTLCMD)
break;
}
}
mutex_unlock(&ioctl_mutex);
if (error != -ENOIOCTLCMD)
goto done;
error = atm_dev_ioctl(cmd, argp);
done:
return error;
}
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