C++ capable函数代码示例

static int jffs2_do_setattr (struct inode *inode, struct iattr *iattr)
{
	struct jffs2_full_dnode *old_metadata, *new_metadata;
	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
	struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
	struct jffs2_raw_inode *ri;
	unsigned short dev;
	unsigned char *mdata = NULL;
	int mdatalen = 0;
	unsigned int ivalid;
	uint32_t phys_ofs, alloclen;
	int ret;
	D1(printk(KERN_DEBUG "jffs2_setattr(): ino #%lu\n", inode->i_ino));
	ret = inode_change_ok(inode, iattr);
	if (ret) 
		return ret;

	/* Special cases - we don't want more than one data node
	   for these types on the medium at any time. So setattr
	   must read the original data associated with the node
	   (i.e. the device numbers or the target name) and write
	   it out again with the appropriate data attached */
	if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) {
		/* For these, we don't actually need to read the old node */
		dev = old_encode_dev(inode->i_rdev);
		mdata = (char *)&dev;
		mdatalen = sizeof(dev);
		D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of kdev_t\n", mdatalen));
	} else if (S_ISLNK(inode->i_mode)) {
		mdatalen = f->metadata->size;
		mdata = kmalloc(f->metadata->size, GFP_USER);
		if (!mdata)
			return -ENOMEM;
		ret = jffs2_read_dnode(c, f->metadata, mdata, 0, mdatalen);
		if (ret) {
			kfree(mdata);
			return ret;
		}
		D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of symlink target\n", mdatalen));
	}

	ri = jffs2_alloc_raw_inode();
	if (!ri) {
		if (S_ISLNK(inode->i_mode))
			kfree(mdata);
		return -ENOMEM;
	}
		
	ret = jffs2_reserve_space(c, sizeof(*ri) + mdatalen, &phys_ofs, &alloclen, ALLOC_NORMAL);
	if (ret) {
		jffs2_free_raw_inode(ri);
		if (S_ISLNK(inode->i_mode & S_IFMT))
			 kfree(mdata);
		return ret;
	}
	down(&f->sem);
	ivalid = iattr->ia_valid;
	
	ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
	ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE);
	ri->totlen = cpu_to_je32(sizeof(*ri) + mdatalen);
	ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));

	ri->ino = cpu_to_je32(inode->i_ino);
	ri->version = cpu_to_je32(++f->highest_version);

	ri->uid = cpu_to_je16((ivalid & ATTR_UID)?iattr->ia_uid:inode->i_uid);
	ri->gid = cpu_to_je16((ivalid & ATTR_GID)?iattr->ia_gid:inode->i_gid);

	if (ivalid & ATTR_MODE)
		if (iattr->ia_mode & S_ISGID &&
		    !in_group_p(je16_to_cpu(ri->gid)) && !capable(CAP_FSETID))
			ri->mode = cpu_to_jemode(iattr->ia_mode & ~S_ISGID);
		else 
			ri->mode = cpu_to_jemode(iattr->ia_mode);
	else
		ri->mode = cpu_to_jemode(inode->i_mode);


	ri->isize = cpu_to_je32((ivalid & ATTR_SIZE)?iattr->ia_size:inode->i_size);
	ri->atime = cpu_to_je32(I_SEC((ivalid & ATTR_ATIME)?iattr->ia_atime:inode->i_atime));
	ri->mtime = cpu_to_je32(I_SEC((ivalid & ATTR_MTIME)?iattr->ia_mtime:inode->i_mtime));
	ri->ctime = cpu_to_je32(I_SEC((ivalid & ATTR_CTIME)?iattr->ia_ctime:inode->i_ctime));

	ri->offset = cpu_to_je32(0);
	ri->csize = ri->dsize = cpu_to_je32(mdatalen);
	ri->compr = JFFS2_COMPR_NONE;
	if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) {
		/* It's an extension. Make it a hole node */
		ri->compr = JFFS2_COMPR_ZERO;
		ri->dsize = cpu_to_je32(iattr->ia_size - inode->i_size);
		ri->offset = cpu_to_je32(inode->i_size);
	}
	ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
	if (mdatalen)
		ri->data_crc = cpu_to_je32(crc32(0, mdata, mdatalen));
	else
		ri->data_crc = cpu_to_je32(0);

	new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, phys_ofs, ALLOC_NORMAL);
//.........这里部分代码省略.........

static int open_mem(struct inode * inode, struct file * filp)
{
	return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
}

static ssize_t rtc_write(UNUSED struct file *filp, const char *buf,
                         size_t count, loff_t *ppos)
{
	struct rtc_time rtc_tm;
	char buffer[23];
	char *p;

	if (!capable(CAP_SYS_TIME))
		return -EACCES;

	if (ppos != &filp->f_pos)
		return -ESPIPE;

	/*
	 * For simplicity, the only acceptable format is:
	 * YYYY:MM:DD:W:HH:MM:SS\n
	 */

	if (count != 22)
		goto err_out;

	if (copy_from_user(buffer, buf, count))
		return -EFAULT;

	buffer[sizeof(buffer)-1] = '\0';

	p = &buffer[0];

	rtc_tm.tm_year  = simple_strtoul(p, &p, 10);
	if (*p++ != ':') goto err_out;

	rtc_tm.tm_mon = simple_strtoul(p, &p, 10) - 1;
	if (*p++ != ':') goto err_out;

	rtc_tm.tm_mday = simple_strtoul(p, &p, 10);
	if (*p++ != ':') goto err_out;

	rtc_tm.tm_wday = simple_strtoul(p, &p, 10);
	if (*p++ != ':') goto err_out;

	rtc_tm.tm_hour = simple_strtoul(p, &p, 10);
	if (*p++ != ':') goto err_out;

	rtc_tm.tm_min = simple_strtoul(p, &p, 10);
	if (*p++ != ':') goto err_out;

	rtc_tm.tm_sec = simple_strtoul(p, &p, 10);
	if (*p != '\n') goto err_out;

	rtc_tm.tm_year -= RTC_EPOCH;

	set_rtc_time(&rtc_tm);

	*ppos += count;

	return count;

 err_out:
	printk(KERN_ERR "invalid format: use YYYY:MM:DD:W:HH:MM:SS\\n\n");
	return -EINVAL;
}

static int
ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
{
	int err = 0;
	struct ip_tunnel_parm p;
	struct ip_tunnel *t;

	switch (cmd) {
	case SIOCGETTUNNEL:
		t = NULL;
		if (dev == ipip6_fb_tunnel_dev) {
			if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
				err = -EFAULT;
				break;
			}
			t = ipip6_tunnel_locate(&p, 0);
		}
		if (t == NULL)
			t = netdev_priv(dev);
		memcpy(&p, &t->parms, sizeof(p));
		if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
			err = -EFAULT;
		break;

	case SIOCADDTUNNEL:
	case SIOCCHGTUNNEL:
		err = -EPERM;
		if (!capable(CAP_NET_ADMIN))
			goto done;

		err = -EFAULT;
		if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
			goto done;

		err = -EINVAL;
		if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 ||
		    p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
			goto done;
		if (p.iph.ttl)
			p.iph.frag_off |= htons(IP_DF);

		t = ipip6_tunnel_locate(&p, cmd == SIOCADDTUNNEL);

		if (dev != ipip6_fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
			if (t != NULL) {
				if (t->dev != dev) {
					err = -EEXIST;
					break;
				}
			} else {
				if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
				    (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
					err = -EINVAL;
					break;
				}
				t = netdev_priv(dev);
				ipip6_tunnel_unlink(t);
				t->parms.iph.saddr = p.iph.saddr;
				t->parms.iph.daddr = p.iph.daddr;
				memcpy(dev->dev_addr, &p.iph.saddr, 4);
				memcpy(dev->broadcast, &p.iph.daddr, 4);
				ipip6_tunnel_link(t);
				netdev_state_change(dev);
			}
		}

		if (t) {
			err = 0;
			if (cmd == SIOCCHGTUNNEL) {
				t->parms.iph.ttl = p.iph.ttl;
				t->parms.iph.tos = p.iph.tos;
			}
			if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
				err = -EFAULT;
		} else
			err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
		break;

	case SIOCDELTUNNEL:
		err = -EPERM;
		if (!capable(CAP_NET_ADMIN))
			goto done;

		if (dev == ipip6_fb_tunnel_dev) {
			err = -EFAULT;
			if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
				goto done;
			err = -ENOENT;
			if ((t = ipip6_tunnel_locate(&p, 0)) == NULL)
				goto done;
			err = -EPERM;
			if (t == netdev_priv(ipip6_fb_tunnel_dev))
				goto done;
			dev = t->dev;
		}
		err = unregister_netdevice(dev);
		break;

	default:
		err = -EINVAL;
//.........这里部分代码省略.........

static int pep_setsockopt(struct sock *sk, int level, int optname,
				char __user *optval, unsigned int optlen)
{
	struct pep_sock *pn = pep_sk(sk);
	int val = 0, err = 0;

	if (level != SOL_PNPIPE)
		return -ENOPROTOOPT;
	if (optlen >= sizeof(int)) {
		if (get_user(val, (int __user *) optval))
			return -EFAULT;
	}

	lock_sock(sk);
	switch (optname) {
	case PNPIPE_ENCAP:
		if (val && val != PNPIPE_ENCAP_IP) {
			err = -EINVAL;
			break;
		}
		if (!pn->ifindex == !val)
			break; /* Nothing to do! */
		if (!capable(CAP_NET_ADMIN)) {
			err = -EPERM;
			break;
		}
		if (val) {
			release_sock(sk);
			err = gprs_attach(sk);
			if (err > 0) {
				pn->ifindex = err;
				err = 0;
			}
		} else {
			pn->ifindex = 0;
			release_sock(sk);
			gprs_detach(sk);
			err = 0;
		}
		goto out_norel;

	case PNPIPE_HANDLE:
		if ((sk->sk_state == TCP_CLOSE) &&
			(val >= 0) && (val < PN_PIPE_INVALID_HANDLE))
			pn->pipe_handle = val;
		else
			err = -EINVAL;
		break;

	case PNPIPE_INITSTATE:
		pn->init_enable = !!val;
		break;

	default:
		err = -ENOPROTOOPT;
	}
	release_sock(sk);

out_norel:
	return err;
}

//.........这里部分代码省略.........
		struct group_filter *gsf = NULL;
		int msize, i, ifindex;

		if (optlen < GROUP_FILTER_SIZE(0))
			goto e_inval;
		if (optlen > sysctl_optmem_max) {
			err = -ENOBUFS;
			break;
		}
		gsf = kmalloc(optlen, GFP_KERNEL);
		if (!gsf) {
			err = -ENOBUFS;
			break;
		}
		err = -EFAULT;
		if (copy_from_user(gsf, optval, optlen)) {
			goto mc_msf_out;
		}
		/* numsrc >= (4G-140)/128 overflow in 32 bits */
		if (gsf->gf_numsrc >= 0x1ffffff ||
		    gsf->gf_numsrc > (*ax8netfilter_sysctl_igmp_max_msf)) {
			err = -ENOBUFS;
			goto mc_msf_out;
		}
		if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
			err = -EINVAL;
			goto mc_msf_out;
		}
		msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
		msf = kmalloc(msize, GFP_KERNEL);
		if (!msf) {
			err = -ENOBUFS;
			goto mc_msf_out;
		}
		ifindex = gsf->gf_interface;
		psin = (struct sockaddr_in *)&gsf->gf_group;
		if (psin->sin_family != AF_INET) {
			err = -EADDRNOTAVAIL;
			goto mc_msf_out;
		}
		msf->imsf_multiaddr = psin->sin_addr.s_addr;
		msf->imsf_interface = 0;
		msf->imsf_fmode = gsf->gf_fmode;
		msf->imsf_numsrc = gsf->gf_numsrc;
		err = -EADDRNOTAVAIL;
		for (i=0; i<gsf->gf_numsrc; ++i) {
			psin = (struct sockaddr_in *)&gsf->gf_slist[i];

			if (psin->sin_family != AF_INET)
				goto mc_msf_out;
			msf->imsf_slist[i] = psin->sin_addr.s_addr;
		}
		kfree(gsf);
		gsf = NULL;

		err = ax8netfilter_ip_mc_msfilter(sk, msf, ifindex);
	mc_msf_out:
		kfree(msf);
		kfree(gsf);
		break;
	}
	case IP_ROUTER_ALERT:
		err = ax8netfilter_ip_ra_control(sk, val ? 1 : 0, NULL);
		break;

	case IP_FREEBIND:
		if (optlen<1)
			goto e_inval;
		inet->freebind = !!val;
		break;

	case IP_IPSEC_POLICY:
	case IP_XFRM_POLICY:
		err = -EPERM;
		if (!capable(CAP_NET_ADMIN))
			break;
		err = xfrm_user_policy(sk, optname, optval, optlen);
		break;

	case IP_TRANSPARENT:
		if (!capable(CAP_NET_ADMIN)) {
			err = -EPERM;
			break;
		}
		if (optlen < 1)
			goto e_inval;
		inet->transparent = !!val;
		break;

	default:
		err = -ENOPROTOOPT;
		break;
	}
	release_sock(sk);
	return err;

e_inval:
	release_sock(sk);
	return -EINVAL;
}

static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
{
	struct inode *inode = file->f_path.dentry->d_inode;
	struct btrfs_inode *ip = BTRFS_I(inode);
	struct btrfs_root *root = ip->root;
	struct btrfs_trans_handle *trans;
	unsigned int flags, oldflags;
	int ret;

	if (copy_from_user(&flags, arg, sizeof(flags)))
		return -EFAULT;

	if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
		      FS_NOATIME_FL | FS_NODUMP_FL | \
		      FS_SYNC_FL | FS_DIRSYNC_FL))
		return -EOPNOTSUPP;

	if (!is_owner_or_cap(inode))
		return -EACCES;

	mutex_lock(&inode->i_mutex);

	flags = btrfs_mask_flags(inode->i_mode, flags);
	oldflags = btrfs_flags_to_ioctl(ip->flags);
	if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
		if (!capable(CAP_LINUX_IMMUTABLE)) {
			ret = -EPERM;
			goto out_unlock;
		}
	}

	ret = mnt_want_write(file->f_path.mnt);
	if (ret)
		goto out_unlock;

	if (flags & FS_SYNC_FL)
		ip->flags |= BTRFS_INODE_SYNC;
	else
		ip->flags &= ~BTRFS_INODE_SYNC;
	if (flags & FS_IMMUTABLE_FL)
		ip->flags |= BTRFS_INODE_IMMUTABLE;
	else
		ip->flags &= ~BTRFS_INODE_IMMUTABLE;
	if (flags & FS_APPEND_FL)
		ip->flags |= BTRFS_INODE_APPEND;
	else
		ip->flags &= ~BTRFS_INODE_APPEND;
	if (flags & FS_NODUMP_FL)
		ip->flags |= BTRFS_INODE_NODUMP;
	else
		ip->flags &= ~BTRFS_INODE_NODUMP;
	if (flags & FS_NOATIME_FL)
		ip->flags |= BTRFS_INODE_NOATIME;
	else
		ip->flags &= ~BTRFS_INODE_NOATIME;
	if (flags & FS_DIRSYNC_FL)
		ip->flags |= BTRFS_INODE_DIRSYNC;
	else
		ip->flags &= ~BTRFS_INODE_DIRSYNC;


	trans = btrfs_join_transaction(root, 1);
	BUG_ON(!trans);

	ret = btrfs_update_inode(trans, root, inode);
	BUG_ON(ret);

	btrfs_update_iflags(inode);
	inode->i_ctime = CURRENT_TIME;
	btrfs_end_transaction(trans, root);

	mnt_drop_write(file->f_path.mnt);
 out_unlock:
	mutex_unlock(&inode->i_mutex);
	return 0;
}

/**
 * cap_settime - Determine whether the current process may set the system clock
 * @ts: The time to set
 * @tz: The timezone to set
 *
 * Determine whether the current process may set the system clock and timezone
 * information, returning 0 if permission granted, -ve if denied.
 */
int cap_settime(struct timespec *ts, struct timezone *tz)
{
	if (!capable(CAP_SYS_TIME))
		return -EPERM;
	return 0;
}

static int slcan_open(struct tty_struct *tty)
{
	struct slcan *sl;
	int err;

	if (!capable(CAP_NET_ADMIN))
		return -EPERM;

	if (tty->ops->write == NULL)
		return -EOPNOTSUPP;

	/* RTnetlink lock is misused here to serialize concurrent
	   opens of slcan channels. There are better ways, but it is
	   the simplest one.
	 */
	rtnl_lock();

	/* Collect hanged up channels. */
	slc_sync();

	sl = tty->disc_data;

	err = -EEXIST;
	/* First make sure we're not already connected. */
	if (sl && sl->magic == SLCAN_MAGIC)
		goto err_exit;

	/* OK.  Find a free SLCAN channel to use. */
	err = -ENFILE;
	sl = slc_alloc();
	if (sl == NULL)
		goto err_exit;

	sl->tty = tty;
	tty->disc_data = sl;

	if (!test_bit(SLF_INUSE, &sl->flags)) {
		/* Perform the low-level SLCAN initialization. */
		sl->rcount   = 0;
		sl->xleft    = 0;

		set_bit(SLF_INUSE, &sl->flags);

		err = register_netdevice(sl->dev);
		if (err)
			goto err_free_chan;
	}

	/* Done.  We have linked the TTY line to a channel. */
	rtnl_unlock();
	tty->receive_room = 65536;	/* We don't flow control */

	/* TTY layer expects 0 on success */
	return 0;

err_free_chan:
	sl->tty = NULL;
	tty->disc_data = NULL;
	clear_bit(SLF_INUSE, &sl->flags);

err_exit:
	rtnl_unlock();

	/* Count references from TTY module */
	return err;
}

static int
ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
	int err = 0;
	struct ip6_tnl_parm p;
	struct ip6_tnl *t = NULL;
	struct net *net = dev_net(dev);
	struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);

	switch (cmd) {
	case SIOCGETTUNNEL:
		if (dev == ip6n->fb_tnl_dev) {
			if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) {
				err = -EFAULT;
				break;
			}
			t = ip6_tnl_locate(net, &p, 0);
		}
		if (t == NULL)
			t = netdev_priv(dev);
		memcpy(&p, &t->parms, sizeof (p));
		if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) {
			err = -EFAULT;
		}
		break;
	case SIOCADDTUNNEL:
	case SIOCCHGTUNNEL:
		err = -EPERM;
		if (!capable(CAP_NET_ADMIN))
			break;
		err = -EFAULT;
		if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
			break;
		err = -EINVAL;
		if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
		    p.proto != 0)
			break;
		t = ip6_tnl_locate(net, &p, cmd == SIOCADDTUNNEL);
		if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
			if (t != NULL) {
				if (t->dev != dev) {
					err = -EEXIST;
					break;
				}
			} else
				t = netdev_priv(dev);

			ip6_tnl_unlink(ip6n, t);
			err = ip6_tnl_change(t, &p);
			ip6_tnl_link(ip6n, t);
			netdev_state_change(dev);
		}
		if (t) {
			err = 0;
			if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p)))
				err = -EFAULT;

		} else
			err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
		break;
	case SIOCDELTUNNEL:
		err = -EPERM;
		if (!capable(CAP_NET_ADMIN))
			break;

		if (dev == ip6n->fb_tnl_dev) {
			err = -EFAULT;
			if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
				break;
			err = -ENOENT;
			if ((t = ip6_tnl_locate(net, &p, 0)) == NULL)
				break;
			err = -EPERM;
			if (t->dev == ip6n->fb_tnl_dev)
				break;
			dev = t->dev;
		}
		err = 0;
		unregister_netdevice(dev);
		break;
	default:
		err = -EINVAL;
	}
	return err;
}

int scull_p_ioctl(struct file *filp, unsigned int cmd, unsigned long arg){

       int retval = 0, tmp, err = 0;

        /* extract the type and number bitfields, and don't
         * decode wrong cmds: return ENOTTY before access_ok()
         */
        if(_IOC_TYPE(cmd) != SCULL_IOC_MAGIC)
                return -ENOTTY;

        if(_IOC_NR(cmd) > SCULL_IOC_MAXNR)
                return -ENOTTY;

       /* the direction field is a bitmask (2 bits), and
        * VERIFY_WRITE catches R/W transfers. 'direction'
        * bitfield is user-oriented, while acces_ok() is
         * kernel-oriented, so the concept of "read" and
         * "write" is reversed
         */

        /* access_ok() returns non-zero as success and 0
	 * as error
         */

        if(_IOC_DIR(cmd) & _IOC_READ)
                err = !access_ok(VERIFY_WRITE, (void __user*)arg, _IOC_SIZE(cmd));

        else if(_IOC_DIR(cmd) & _IOC_WRITE)
                err = !access_ok(VERIFY_READ, (void __user*)arg, _IOC_SIZE(cmd));

        if(err)
                return -EFAULT;

        switch(cmd){

               case SCULL_IOCRESET:
                        scull_quantum = SCULL_QUANTUM;
                        scull_qset = SCULL_QSET;
                       break;

                case SCULL_IOCSQUANTUM: /* Set: arg points to the value */
                        if(!capable(CAP_SYS_ADMIN))
                                return -EPERM;

                        retval = __get_user(scull_quantum, (int __user*)arg);
                        break;

                case SCULL_IOCTQUANTUM: /* Tell: arg is the value */
                       if(!capable(CAP_SYS_ADMIN))
                                return -EPERM;

                        scull_quantum = arg;
                        break;

                case SCULL_IOCGQUANTUM: /* Get: arg is pointer to result */
                        retval = __put_user(scull_quantum, (int __user*)arg);
                       break;

                case SCULL_IOCQQUANTUM: /* Query: return it (it's positive) */
                        return scull_quantum;

                case SCULL_IOCXQUANTUM: /* eXchange: use arg as pointer */
                        if(!capable(CAP_SYS_ADMIN))
                                return -EPERM;
                        tmp = scull_quantum;
                        retval = __get_user(scull_quantum, (int __user*)arg);
                        if(retval == 0)
                                retval = __put_user(tmp, (int __user *)arg);
                        break;

                case SCULL_IOCHQUANTUM: /* sHift: like Tell + Query */
                        if(!capable(CAP_SYS_ADMIN))
                                return -EPERM;
                        tmp = scull_quantum;
                        scull_quantum = arg;
                       return tmp;

                default: /* Redundant, as cmd was checked against MAXNR */
			return -ENOTTY;
	
        }
        return retval;

}

static int bnep_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
	struct bnep_connlist_req cl;
	struct bnep_connadd_req  ca;
	struct bnep_conndel_req  cd;
	struct bnep_conninfo ci;
	struct socket *nsock;
	void __user *argp = (void __user *)arg;
	int err;

	BT_DBG("cmd %x arg %lx", cmd, arg);

	switch (cmd) {
	case BNEPCONNADD:
		if (!capable(CAP_NET_ADMIN))
			return -EACCES;

		if (copy_from_user(&ca, argp, sizeof(ca)))
			return -EFAULT;

		nsock = sockfd_lookup(ca.sock, &err);
		if (!nsock)
			return err;

		if (nsock->sk->sk_state != BT_CONNECTED) {
			sockfd_put(nsock);
			return -EBADFD;
		}
		ca.device[sizeof(ca.device)-1] = 0;

		err = bnep_add_connection(&ca, nsock);
		if (!err) {
			if (copy_to_user(argp, &ca, sizeof(ca)))
				err = -EFAULT;
		} else
			sockfd_put(nsock);

		return err;

	case BNEPCONNDEL:
		if (!capable(CAP_NET_ADMIN))
			return -EACCES;

		if (copy_from_user(&cd, argp, sizeof(cd)))
			return -EFAULT;

		return bnep_del_connection(&cd);

	case BNEPGETCONNLIST:
		if (copy_from_user(&cl, argp, sizeof(cl)))
			return -EFAULT;

		if (cl.cnum <= 0)
			return -EINVAL;

		err = bnep_get_connlist(&cl);
		if (!err && copy_to_user(argp, &cl, sizeof(cl)))
			return -EFAULT;

		return err;

	case BNEPGETCONNINFO:
		if (copy_from_user(&ci, argp, sizeof(ci)))
			return -EFAULT;

		err = bnep_get_conninfo(&ci);
		if (!err && copy_to_user(argp, &ci, sizeof(ci)))
			return -EFAULT;

		return err;

	default:
		return -EINVAL;
	}

	return 0;
}

asmlinkage int
sunos_mount(char __user *type, char __user *dir, int flags, void __user *data)
{
	int linux_flags = 0;
	int ret = -EINVAL;
	char *dev_fname = NULL;
	char *dir_page, *type_page;

	if (!capable (CAP_SYS_ADMIN))
		return -EPERM;
		
	lock_kernel();
	/* We don't handle the integer fs type */
	if ((flags & SMNT_NEWTYPE) == 0)
		goto out;

	/* Do not allow for those flags we don't support */
	if (flags & (SMNT_GRPID|SMNT_NOSUB|SMNT_MULTI|SMNT_SYS5))
		goto out;

	if (flags & SMNT_REMOUNT)
		linux_flags |= MS_REMOUNT;
	if (flags & SMNT_RDONLY)
		linux_flags |= MS_RDONLY;
	if (flags & SMNT_NOSUID)
		linux_flags |= MS_NOSUID;

	dir_page = getname(dir);
	ret = PTR_ERR(dir_page);
	if (IS_ERR(dir_page))
		goto out;

	type_page = getname(type);
	ret = PTR_ERR(type_page);
	if (IS_ERR(type_page))
		goto out1;

	if (strcmp(type_page, "ext2") == 0) {
		dev_fname = getname(data);
	} else if (strcmp(type_page, "iso9660") == 0) {
		dev_fname = getname(data);
	} else if (strcmp(type_page, "minix") == 0) {
		dev_fname = getname(data);
	} else if (strcmp(type_page, "nfs") == 0) {
		ret = sunos_nfs_mount (dir_page, flags, data);
		goto out2;
        } else if (strcmp(type_page, "ufs") == 0) {
		printk("Warning: UFS filesystem mounts unsupported.\n");
		ret = -ENODEV;
		goto out2;
	} else if (strcmp(type_page, "proc")) {
		ret = -ENODEV;
		goto out2;
	}
	ret = PTR_ERR(dev_fname);
	if (IS_ERR(dev_fname))
		goto out2;
	ret = do_mount(dev_fname, dir_page, type_page, linux_flags, NULL);
	if (dev_fname)
		putname(dev_fname);
out2:
	putname(type_page);
out1:
	putname(dir_page);
out:
	unlock_kernel();
	return ret;
}

int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg)
{
	int err;
	struct arpreq r;
	struct net_device *dev = NULL;

	switch (cmd) {
		case SIOCDARP:
		case SIOCSARP:
			if (!capable(CAP_NET_ADMIN))
				return -EPERM;
		case SIOCGARP:
			err = copy_from_user(&r, arg, sizeof(struct arpreq));
			if (err)
				return -EFAULT;
			break;
		default:
			return -EINVAL;
	}

	if (r.arp_pa.sa_family != AF_INET)
		return -EPFNOSUPPORT;

	if (!(r.arp_flags & ATF_PUBL) &&
	    (r.arp_flags & (ATF_NETMASK|ATF_DONTPUB)))
		return -EINVAL;
	if (!(r.arp_flags & ATF_NETMASK))
		((struct sockaddr_in *)&r.arp_netmask)->sin_addr.s_addr =
							   htonl(0xFFFFFFFFUL);
	rtnl_lock();
	if (r.arp_dev[0]) {
		err = -ENODEV;
		if ((dev = __dev_get_by_name(net, r.arp_dev)) == NULL)
			goto out;

		/* Mmmm... It is wrong... ARPHRD_NETROM==0 */
		if (!r.arp_ha.sa_family)
			r.arp_ha.sa_family = dev->type;
		err = -EINVAL;
		if ((r.arp_flags & ATF_COM) && r.arp_ha.sa_family != dev->type)
			goto out;
	} else if (cmd == SIOCGARP) {
		err = -ENODEV;
		goto out;
	}

	switch (cmd) {
	case SIOCDARP:
		err = arp_req_delete(net, &r, dev);
		break;
	case SIOCSARP:
		err = arp_req_set(net, &r, dev);
		break;
	case SIOCGARP:
		err = arp_req_get(&r, dev);
		if (!err && copy_to_user(arg, &r, sizeof(r)))
			err = -EFAULT;
		break;
	}
out:
	rtnl_unlock();
	return err;
}

asmlinkage long
sys_pciconfig_read(unsigned long bus, unsigned long dfn,
		   unsigned long off, unsigned long len,
		   void __user *buf)
{
	struct pci_dev *dev;
	u8 byte;
	u16 word;
	u32 dword;
	long err, cfg_ret;

	err = -EPERM;
	if (!capable(CAP_SYS_ADMIN))
		goto error;

	err = -ENODEV;
	dev = pci_find_slot(bus, dfn);
	if (!dev)
		goto error;

	lock_kernel();
	switch (len) {
	case 1:
		cfg_ret = pci_read_config_byte(dev, off, &byte);
		break;
	case 2:
		cfg_ret = pci_read_config_word(dev, off, &word);
		break;
	case 4:
		cfg_ret = pci_read_config_dword(dev, off, &dword);
		break;
	default:
		err = -EINVAL;
		unlock_kernel();
		goto error;
	};
	unlock_kernel();

	err = -EIO;
	if (cfg_ret != PCIBIOS_SUCCESSFUL)
		goto error;

	switch (len) {
	case 1:
		err = put_user(byte, (unsigned char __user *)buf);
		break;
	case 2:
		err = put_user(word, (unsigned short __user *)buf);
		break;
	case 4:
		err = put_user(dword, (unsigned int __user *)buf);
		break;
	};
	return err;

error:
	/* ??? XFree86 doesn't even check the return value.  They
	   just look for 0xffffffff in the output, since that's what
	   they get instead of a machine check on x86.  */
	switch (len) {
	case 1:
		put_user(-1, (unsigned char __user *)buf);
		break;
	case 2:
		put_user(-1, (unsigned short __user *)buf);
		break;
	case 4:
		put_user(-1, (unsigned int __user *)buf);
		break;
	};
	return err;
}