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