ioctl.c

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

/*
 *  ioctl.c
 *
 *  Copyright (C) 1995, 1996 by Volker Lendecke
 *  Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache
 *  Modified 1998, 1999 Wolfram Pienkoss for NLS
 *
 */

#include <linux/config.h>

#include <asm/uaccess.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/ioctl.h>
#include <linux/time.h>
#include <linux/mm.h>
#include <linux/highuid.h>
#include <linux/vmalloc.h>

#include <linux/ncp_fs.h>

#include "ncplib_kernel.h"

/* maximum limit for ncp_objectname_ioctl */
#define NCP_OBJECT_NAME_MAX_LEN	4096
/* maximum limit for ncp_privatedata_ioctl */
#define NCP_PRIVATE_DATA_MAX_LEN 8192
/* maximum negotiable packet size */
#define NCP_PACKET_SIZE_INTERNAL 65536

static int
ncp_get_fs_info(struct ncp_server* server, struct inode* inode, struct ncp_fs_info __user *arg)
{
	struct ncp_fs_info info;

	if ((permission(inode, MAY_WRITE, NULL) != 0)
	    && (current->uid != server->m.mounted_uid)) {
		return -EACCES;
	}
	if (copy_from_user(&info, arg, sizeof(info)))
		return -EFAULT;

	if (info.version != NCP_GET_FS_INFO_VERSION) {
		DPRINTK("info.version invalid: %d\n", info.version);
		return -EINVAL;
	}
	/* TODO: info.addr = server->m.serv_addr; */
	SET_UID(info.mounted_uid, server->m.mounted_uid);
	info.connection		= server->connection;
	info.buffer_size	= server->buffer_size;
	info.volume_number	= NCP_FINFO(inode)->volNumber;
	info.directory_id	= NCP_FINFO(inode)->DosDirNum;

	if (copy_to_user(arg, &info, sizeof(info)))
		return -EFAULT;
	return 0;
}

static int
ncp_get_fs_info_v2(struct ncp_server* server, struct inode* inode, struct ncp_fs_info_v2 __user * arg)
{
	struct ncp_fs_info_v2 info2;

	if ((permission(inode, MAY_WRITE, NULL) != 0)
	    && (current->uid != server->m.mounted_uid)) {
		return -EACCES;
	}
	if (copy_from_user(&info2, arg, sizeof(info2)))
		return -EFAULT;

	if (info2.version != NCP_GET_FS_INFO_VERSION_V2) {
		DPRINTK("info.version invalid: %d\n", info2.version);
		return -EINVAL;
	}
	info2.mounted_uid   = server->m.mounted_uid;
	info2.connection    = server->connection;
	info2.buffer_size   = server->buffer_size;
	info2.volume_number = NCP_FINFO(inode)->volNumber;
	info2.directory_id  = NCP_FINFO(inode)->DosDirNum;
	info2.dummy1 = info2.dummy2 = info2.dummy3 = 0;

	if (copy_to_user(arg, &info2, sizeof(info2)))
		return -EFAULT;
	return 0;
}

#ifdef CONFIG_NCPFS_NLS
/* Here we are select the iocharset and the codepage for NLS.
 * Thanks Petr Vandrovec for idea and many hints.
 */
static int
ncp_set_charsets(struct ncp_server* server, struct ncp_nls_ioctl __user *arg)
{
	struct ncp_nls_ioctl user;
	struct nls_table *codepage;
	struct nls_table *iocharset;
	struct nls_table *oldset_io;
	struct nls_table *oldset_cp;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;
	if (server->root_setuped)
		return -EBUSY;

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

	codepage = NULL;
	user.codepage[NCP_IOCSNAME_LEN] = 0;
	if (!user.codepage[0] || !strcmp(user.codepage, "default"))
		codepage = load_nls_default();
	else {
		codepage = load_nls(user.codepage);
		if (!codepage) {
			return -EBADRQC;
		}
	}

	iocharset = NULL;
	user.iocharset[NCP_IOCSNAME_LEN] = 0;
	if (!user.iocharset[0] || !strcmp(user.iocharset, "default")) {
		iocharset = load_nls_default();
		NCP_CLR_FLAG(server, NCP_FLAG_UTF8);
	} else if (!strcmp(user.iocharset, "utf8")) {
		iocharset = load_nls_default();
		NCP_SET_FLAG(server, NCP_FLAG_UTF8);
	} else {
		iocharset = load_nls(user.iocharset);
		if (!iocharset) {
			unload_nls(codepage);
			return -EBADRQC;
		}
		NCP_CLR_FLAG(server, NCP_FLAG_UTF8);
	}

	oldset_cp = server->nls_vol;
	server->nls_vol = codepage;
	oldset_io = server->nls_io;
	server->nls_io = iocharset;

	if (oldset_cp)
		unload_nls(oldset_cp);
	if (oldset_io)
		unload_nls(oldset_io);

	return 0;
}

static int
ncp_get_charsets(struct ncp_server* server, struct ncp_nls_ioctl __user *arg)
{
	struct ncp_nls_ioctl user;
	int len;

	memset(&user, 0, sizeof(user));
	if (server->nls_vol && server->nls_vol->charset) {
		len = strlen(server->nls_vol->charset);
		if (len > NCP_IOCSNAME_LEN)
			len = NCP_IOCSNAME_LEN;
		strncpy(user.codepage, server->nls_vol->charset, len);
		user.codepage[len] = 0;
	}

	if (NCP_IS_FLAG(server, NCP_FLAG_UTF8))
		strcpy(user.iocharset, "utf8");
	else if (server->nls_io && server->nls_io->charset) {
		len = strlen(server->nls_io->charset);
		if (len > NCP_IOCSNAME_LEN)
			len = NCP_IOCSNAME_LEN;
		strncpy(user.iocharset,	server->nls_io->charset, len);
		user.iocharset[len] = 0;
	}

	if (copy_to_user(arg, &user, sizeof(user)))
		return -EFAULT;
	return 0;
}
#endif /* CONFIG_NCPFS_NLS */

int ncp_ioctl(struct inode *inode, struct file *filp,
	      unsigned int cmd, unsigned long arg)
{
	struct ncp_server *server = NCP_SERVER(inode);
	int result;
	struct ncp_ioctl_request request;
	char* bouncebuffer;
	void __user *argp = (void __user *)arg;

	switch (cmd) {
	case NCP_IOC_NCPREQUEST:

		if ((permission(inode, MAY_WRITE, NULL) != 0)
		    && (current->uid != server->m.mounted_uid)) {
			return -EACCES;
		}
		if (copy_from_user(&request, argp, sizeof(request)))
			return -EFAULT;

		if ((request.function > 255)
		    || (request.size >
		  NCP_PACKET_SIZE - sizeof(struct ncp_request_header))) {
			return -EINVAL;
		}
		bouncebuffer = vmalloc(NCP_PACKET_SIZE_INTERNAL);
		if (!bouncebuffer)
			return -ENOMEM;
		if (copy_from_user(bouncebuffer, request.data, request.size)) {
			vfree(bouncebuffer);
			return -EFAULT;
		}
		ncp_lock_server(server);

		/* FIXME: We hack around in the server's structures
		   here to be able to use ncp_request */

		server->has_subfunction = 0;
		server->current_size = request.size;
		memcpy(server->packet, bouncebuffer, request.size);

		result = ncp_request2(server, request.function, 
			bouncebuffer, NCP_PACKET_SIZE_INTERNAL);
		if (result < 0)
			result = -EIO;
		else
			result = server->reply_size;
		ncp_unlock_server(server);
		DPRINTK("ncp_ioctl: copy %d bytes\n",
			result);
		if (result >= 0)
			if (copy_to_user(request.data, bouncebuffer, result))
				result = -EFAULT;
		vfree(bouncebuffer);
		return result;

	case NCP_IOC_CONN_LOGGED_IN:

		if (!capable(CAP_SYS_ADMIN))
			return -EACCES;
		if (!(server->m.int_flags & NCP_IMOUNT_LOGGEDIN_POSSIBLE))
			return -EINVAL;
		if (server->root_setuped)
			return -EBUSY;
		server->root_setuped = 1;
		return ncp_conn_logged_in(inode->i_sb);

	case NCP_IOC_GET_FS_INFO:
		return ncp_get_fs_info(server, inode, argp);

	case NCP_IOC_GET_FS_INFO_V2:
		return ncp_get_fs_info_v2(server, inode, argp);

	case NCP_IOC_GETMOUNTUID2:
		{
			unsigned long tmp = server->m.mounted_uid;

			if (   (permission(inode, MAY_READ, NULL) != 0)
			    && (current->uid != server->m.mounted_uid))
			{
				return -EACCES;
			}
			if (put_user(tmp, (unsigned long __user *)argp)) 
				return -EFAULT;
			return 0;
		}

	case NCP_IOC_GETROOT:
		{
			struct ncp_setroot_ioctl sr;

			if (   (permission(inode, MAY_READ, NULL) != 0)
			    && (current->uid != server->m.mounted_uid))
			{
				return -EACCES;
			}
			if (server->m.mounted_vol[0]) {
				struct dentry* dentry = inode->i_sb->s_root;

				if (dentry) {
					struct inode* inode = dentry->d_inode;
				
					if (inode) {
						sr.volNumber = NCP_FINFO(inode)->volNumber;
						sr.dirEntNum = NCP_FINFO(inode)->dirEntNum;
						sr.namespace = server->name_space[sr.volNumber];
					} else
						DPRINTK("ncpfs: s_root->d_inode==NULL\n");
				} else
					DPRINTK("ncpfs: s_root==NULL\n");
			} else {
				sr.volNumber = -1;
				sr.namespace = 0;
				sr.dirEntNum = 0;
			}
			if (copy_to_user(argp, &sr, sizeof(sr)))
				return -EFAULT;
			return 0;
		}
	case NCP_IOC_SETROOT:
		{
			struct ncp_setroot_ioctl sr;
			__u32 vnum;
			__le32 de;
			__le32 dosde;
			struct dentry* dentry;

			if (!capable(CAP_SYS_ADMIN))
			{
				return -EACCES;
			}
			if (server->root_setuped) return -EBUSY;
			if (copy_from_user(&sr, argp, sizeof(sr)))
				return -EFAULT;
			if (sr.volNumber < 0) {
				server->m.mounted_vol[0] = 0;
				vnum = NCP_NUMBER_OF_VOLUMES;
				de = 0;
				dosde = 0;
			} else if (sr.volNumber >= NCP_NUMBER_OF_VOLUMES) {
				return -EINVAL;
			} else if (ncp_mount_subdir(server, sr.volNumber,
						sr.namespace, sr.dirEntNum,
						&vnum, &de, &dosde)) {
				return -ENOENT;
			}