ioctl.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 650 行 · 第 1/2 页

			
			dentry = inode->i_sb->s_root;
			server->root_setuped = 1;
			if (dentry) {
				struct inode* inode = dentry->d_inode;
				
				if (inode) {
					NCP_FINFO(inode)->volNumber = vnum;
					NCP_FINFO(inode)->dirEntNum = de;
					NCP_FINFO(inode)->DosDirNum = dosde;
				} else
					DPRINTK("ncpfs: s_root->d_inode==NULL\n");
			} else
				DPRINTK("ncpfs: s_root==NULL\n");

			return 0;
		}

#ifdef CONFIG_NCPFS_PACKET_SIGNING	
	case NCP_IOC_SIGN_INIT:
		if ((permission(inode, MAY_WRITE, NULL) != 0)
		    && (current->uid != server->m.mounted_uid))
		{
			return -EACCES;
		}
		if (argp) {
			if (server->sign_wanted)
			{
				struct ncp_sign_init sign;

				if (copy_from_user(&sign, argp, sizeof(sign)))
					return -EFAULT;
				memcpy(server->sign_root,sign.sign_root,8);
				memcpy(server->sign_last,sign.sign_last,16);
				server->sign_active = 1;
			}
			/* ignore when signatures not wanted */
		} else {
			server->sign_active = 0;
		}
		return 0;		
		
        case NCP_IOC_SIGN_WANTED:
		if (   (permission(inode, MAY_READ, NULL) != 0)
		    && (current->uid != server->m.mounted_uid))
		{
			return -EACCES;
		}
		
                if (put_user(server->sign_wanted, (int __user *)argp))
			return -EFAULT;
                return 0;
	case NCP_IOC_SET_SIGN_WANTED:
		{
			int newstate;

			if (   (permission(inode, MAY_WRITE, NULL) != 0)
			    && (current->uid != server->m.mounted_uid))
			{
				return -EACCES;
			}
			/* get only low 8 bits... */
			if (get_user(newstate, (unsigned char __user *)argp))
				return -EFAULT;
			if (server->sign_active) {
				/* cannot turn signatures OFF when active */
				if (!newstate) return -EINVAL;
			} else {
				server->sign_wanted = newstate != 0;
			}
			return 0;
		}

#endif /* CONFIG_NCPFS_PACKET_SIGNING */

#ifdef CONFIG_NCPFS_IOCTL_LOCKING
	case NCP_IOC_LOCKUNLOCK:
		if (   (permission(inode, MAY_WRITE, NULL) != 0)
		    && (current->uid != server->m.mounted_uid))
		{
			return -EACCES;
		}
		{
			struct ncp_lock_ioctl	 rqdata;
			int result;

			if (copy_from_user(&rqdata, argp, sizeof(rqdata)))
				return -EFAULT;
			if (rqdata.origin != 0)
				return -EINVAL;
			/* check for cmd */
			switch (rqdata.cmd) {
				case NCP_LOCK_EX:
				case NCP_LOCK_SH:
						if (rqdata.timeout == 0)
							rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT;
						else if (rqdata.timeout > NCP_LOCK_MAX_TIMEOUT)
							rqdata.timeout = NCP_LOCK_MAX_TIMEOUT;
						break;
				case NCP_LOCK_LOG:
						rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT;	/* has no effect */
				case NCP_LOCK_CLEAR:
						break;
				default:
						return -EINVAL;
			}
			/* locking needs both read and write access */
			if ((result = ncp_make_open(inode, O_RDWR)) != 0)
			{
				return result;
			}
			result = -EIO;
			if (!ncp_conn_valid(server))
				goto outrel;
			result = -EISDIR;
			if (!S_ISREG(inode->i_mode))
				goto outrel;
			if (rqdata.cmd == NCP_LOCK_CLEAR)
			{
				result = ncp_ClearPhysicalRecord(NCP_SERVER(inode),
							NCP_FINFO(inode)->file_handle, 
							rqdata.offset,
							rqdata.length);
				if (result > 0) result = 0;	/* no such lock */
			}
			else
			{
				int lockcmd;

				switch (rqdata.cmd)
				{
					case NCP_LOCK_EX:  lockcmd=1; break;
					case NCP_LOCK_SH:  lockcmd=3; break;
					default:	   lockcmd=0; break;
				}
				result = ncp_LogPhysicalRecord(NCP_SERVER(inode),
							NCP_FINFO(inode)->file_handle,
							lockcmd,
							rqdata.offset,
							rqdata.length,
							rqdata.timeout);
				if (result > 0) result = -EAGAIN;
			}
outrel:			
			ncp_inode_close(inode);
			return result;
		}
#endif	/* CONFIG_NCPFS_IOCTL_LOCKING */

	case NCP_IOC_GETOBJECTNAME:
		if (current->uid != server->m.mounted_uid) {
			return -EACCES;
		}
		{
			struct ncp_objectname_ioctl user;
			size_t outl;

			if (copy_from_user(&user, argp, sizeof(user)))
				return -EFAULT;
			user.auth_type = server->auth.auth_type;
			outl = user.object_name_len;
			user.object_name_len = server->auth.object_name_len;
			if (outl > user.object_name_len)
				outl = user.object_name_len;
			if (outl) {
				if (copy_to_user(user.object_name,
						 server->auth.object_name,
						 outl)) return -EFAULT;
			}
			if (copy_to_user(argp, &user, sizeof(user)))
				return -EFAULT;
			return 0;
		}
	case NCP_IOC_SETOBJECTNAME:
		if (current->uid != server->m.mounted_uid) {
			return -EACCES;
		}
		{
			struct ncp_objectname_ioctl user;
			void* newname;
			void* oldname;
			size_t oldnamelen;
			void* oldprivate;
			size_t oldprivatelen;

			if (copy_from_user(&user, argp, sizeof(user)))
				return -EFAULT;
			if (user.object_name_len > NCP_OBJECT_NAME_MAX_LEN)
				return -ENOMEM;
			if (user.object_name_len) {
				newname = ncp_kmalloc(user.object_name_len, GFP_USER);
				if (!newname) return -ENOMEM;
				if (copy_from_user(newname, user.object_name, user.object_name_len)) {
					ncp_kfree_s(newname, user.object_name_len);
					return -EFAULT;
				}
			} else {
				newname = NULL;
			}
			/* enter critical section */
			/* maybe that kfree can sleep so do that this way */
			/* it is at least more SMP friendly (in future...) */
			oldname = server->auth.object_name;
			oldnamelen = server->auth.object_name_len;
			oldprivate = server->priv.data;
			oldprivatelen = server->priv.len;
			server->auth.auth_type = user.auth_type;
			server->auth.object_name_len = user.object_name_len;
			server->auth.object_name = newname;
			server->priv.len = 0;
			server->priv.data = NULL;
			/* leave critical section */
			if (oldprivate) ncp_kfree_s(oldprivate, oldprivatelen);
			if (oldname) ncp_kfree_s(oldname, oldnamelen);
			return 0;
		}
	case NCP_IOC_GETPRIVATEDATA:
		if (current->uid != server->m.mounted_uid) {
			return -EACCES;
		}
		{
			struct ncp_privatedata_ioctl user;
			size_t outl;

			if (copy_from_user(&user, argp, sizeof(user)))
				return -EFAULT;
			outl = user.len;
			user.len = server->priv.len;
			if (outl > user.len) outl = user.len;
			if (outl) {
				if (copy_to_user(user.data,
						 server->priv.data,
						 outl)) return -EFAULT;
			}
			if (copy_to_user(argp, &user, sizeof(user)))
				return -EFAULT;
			return 0;
		}
	case NCP_IOC_SETPRIVATEDATA:
		if (current->uid != server->m.mounted_uid) {
			return -EACCES;
		}
		{
			struct ncp_privatedata_ioctl user;
			void* new;
			void* old;
			size_t oldlen;

			if (copy_from_user(&user, argp, sizeof(user)))
				return -EFAULT;
			if (user.len > NCP_PRIVATE_DATA_MAX_LEN)
				return -ENOMEM;
			if (user.len) {
				new = ncp_kmalloc(user.len, GFP_USER);
				if (!new) return -ENOMEM;
				if (copy_from_user(new, user.data, user.len)) {
					ncp_kfree_s(new, user.len);
					return -EFAULT;
				}
			} else {
				new = NULL;
			}
			/* enter critical section */
			old = server->priv.data;
			oldlen = server->priv.len;
			server->priv.len = user.len;
			server->priv.data = new;
			/* leave critical section */
			if (old) ncp_kfree_s(old, oldlen);
			return 0;
		}

#ifdef CONFIG_NCPFS_NLS
	case NCP_IOC_SETCHARSETS:
		return ncp_set_charsets(server, argp);
		
	case NCP_IOC_GETCHARSETS:
		return ncp_get_charsets(server, argp);

#endif /* CONFIG_NCPFS_NLS */

	case NCP_IOC_SETDENTRYTTL:
		if ((permission(inode, MAY_WRITE, NULL) != 0) &&
				 (current->uid != server->m.mounted_uid))
			return -EACCES;
		{
			u_int32_t user;

			if (copy_from_user(&user, argp, sizeof(user)))
				return -EFAULT;
			/* 20 secs at most... */
			if (user > 20000)
				return -EINVAL;
			user = (user * HZ) / 1000;
			server->dentry_ttl = user;
			return 0;
		}
		
	case NCP_IOC_GETDENTRYTTL:
		{
			u_int32_t user = (server->dentry_ttl * 1000) / HZ;
			if (copy_to_user(argp, &user, sizeof(user)))
				return -EFAULT;
			return 0;
		}

	}
/* #ifdef CONFIG_UID16 */
	/* NCP_IOC_GETMOUNTUID may be same as NCP_IOC_GETMOUNTUID2,
           so we have this out of switch */
	if (cmd == NCP_IOC_GETMOUNTUID) {
		__kernel_uid_t uid = 0;
		if ((permission(inode, MAY_READ, NULL) != 0)
		    && (current->uid != server->m.mounted_uid)) {
			return -EACCES;
		}
		SET_UID(uid, server->m.mounted_uid);
		if (put_user(uid, (__kernel_uid_t __user *)argp))
			return -EFAULT;
		return 0;
	}
/* #endif */
	return -EINVAL;
}