/*
* Perform sanity checks on the dentry in a client's file handle.
*
* Note that the file handle dentry may need to be freed even after
* an error return.
*
* This is only called at the start of an nfsproc call, so fhp points to
* a svc_fh which is all 0 except for the over-the-wire file handle.
*/
__be32
fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access)
{
struct knfsd_fh *fh = &fhp->fh_handle;
struct svc_export *exp = NULL;
struct dentry *dentry;
__be32 error = 0;
dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp));
if (!fhp->fh_dentry) {
__u32 *datap=NULL;
__u32 tfh[3]; /* filehandle fragment for oldstyle filehandles */
int fileid_type;
int data_left = fh->fh_size/4;
error = nfserr_stale;
if (rqstp->rq_client == NULL)
goto out;
if (rqstp->rq_vers > 2)
error = nfserr_badhandle;
if (rqstp->rq_vers == 4 && fh->fh_size == 0)
return nfserr_nofilehandle;
if (fh->fh_version == 1) {
int len;
datap = fh->fh_auth;
if (--data_left<0) goto out;
switch (fh->fh_auth_type) {
case 0: break;
default: goto out;
}
len = key_len(fh->fh_fsid_type) / 4;
if (len == 0) goto out;
if (fh->fh_fsid_type == FSID_MAJOR_MINOR) {
/* deprecated, convert to type 3 */
len = key_len(FSID_ENCODE_DEV)/4;
fh->fh_fsid_type = FSID_ENCODE_DEV;
fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl(fh->fh_fsid[0]), ntohl(fh->fh_fsid[1])));
fh->fh_fsid[1] = fh->fh_fsid[2];
}
if ((data_left -= len)<0) goto out;
exp = exp_find(rqstp->rq_client, fh->fh_fsid_type, datap, &rqstp->rq_chandle);
datap += len;
} else {
dev_t xdev;
ino_t xino;
if (fh->fh_size != NFS_FHSIZE)
goto out;
/* assume old filehandle format */
xdev = old_decode_dev(fh->ofh_xdev);
xino = u32_to_ino_t(fh->ofh_xino);
mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL);
exp = exp_find(rqstp->rq_client, FSID_DEV, tfh,
&rqstp->rq_chandle);
}
if (IS_ERR(exp) && (PTR_ERR(exp) == -EAGAIN
|| PTR_ERR(exp) == -ETIMEDOUT)) {
error = nfserrno(PTR_ERR(exp));
goto out;
}
error = nfserr_stale;
if (!exp || IS_ERR(exp))
goto out;
/* Check if the request originated from a secure port. */
error = nfserr_perm;
if (!rqstp->rq_secure && EX_SECURE(exp)) {
char buf[RPC_MAX_ADDRBUFLEN];
printk(KERN_WARNING
"nfsd: request from insecure port %s!\n",
svc_print_addr(rqstp, buf, sizeof(buf)));
goto out;
}
/* Set user creds for this exportpoint */
error = nfserrno(nfsd_setuser(rqstp, exp));
if (error)
goto out;
/*
* Look up the dentry using the NFS file handle.
*/
error = nfserr_stale;
if (rqstp->rq_vers > 2)
error = nfserr_badhandle;
if (fh->fh_version != 1) {
tfh[0] = fh->ofh_ino;
tfh[1] = fh->ofh_generation;
tfh[2] = fh->ofh_dirino;
datap = tfh;
data_left = 3;
if (fh->ofh_dirino == 0)
fileid_type = 1;
else
fileid_type = 2;
} else
fileid_type = fh->fh_fileid_type;
if (fileid_type == 0)
dentry = dget(exp->ex_dentry);
else {
struct export_operations *nop = exp->ex_mnt->mnt_sb->s_export_op;
dentry = CALL(nop,decode_fh)(exp->ex_mnt->mnt_sb,
datap, data_left,
fileid_type,
nfsd_acceptable, exp);
}
if (dentry == NULL)
goto out;
if (IS_ERR(dentry)) {
if (PTR_ERR(dentry) != -EINVAL)
error = nfserrno(PTR_ERR(dentry));
goto out;
}
if (S_ISDIR(dentry->d_inode->i_mode) &&
(dentry->d_flags & DCACHE_DISCONNECTED)) {
printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %s/%s\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
}
fhp->fh_dentry = dentry;
fhp->fh_export = exp;
nfsd_nr_verified++;
} else {
/* just rechecking permissions
* (e.g. nfsproc_create calls fh_verify, then nfsd_create does as well)
*/
dprintk("nfsd: fh_verify - just checking\n");
dentry = fhp->fh_dentry;
exp = fhp->fh_export;
/* Set user creds for this exportpoint; necessary even
* in the "just checking" case because this may be a
* filehandle that was created by fh_compose, and that
* is about to be used in another nfsv4 compound
* operation */
error = nfserrno(nfsd_setuser(rqstp, exp));
if (error)
goto out;
}
cache_get(&exp->h);
error = nfsd_mode_check(rqstp, dentry->d_inode->i_mode, type);
if (error)
goto out;
/* Finally, check access permissions. */
error = nfsd_permission(exp, dentry, access);
if (error) {
dprintk("fh_verify: %s/%s permission failure, "
"acc=%x, error=%d\n",
dentry->d_parent->d_name.name,
dentry->d_name.name,
access, ntohl(error));
}
out:
if (exp && !IS_ERR(exp))
exp_put(exp);
if (error == nfserr_stale)
nfsdstats.fh_stale++;
return error;
}
/*
* Perform sanity checks on the dentry in a client's file handle.
*
* Note that the file handle dentry may need to be freed even after
* an error return.
*
* This is only called at the start of an nfsproc call, so fhp points to
* a svc_fh which is all 0 except for the over-the-wire file handle.
*/
u32
fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access)
{
struct knfsd_fh *fh = &fhp->fh_handle;
struct svc_export *exp = NULL;
struct dentry *dentry;
struct inode *inode;
u32 error = 0;
dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp));
/* keep this filehandle for possible reference when encoding attributes */
rqstp->rq_reffh = fh;
if (!fhp->fh_dentry) {
__u32 *datap=NULL;
__u32 tfh[3]; /* filehandle fragment for oldstyle filehandles */
int fileid_type;
int data_left = fh->fh_size/4;
error = nfserr_stale;
if (rqstp->rq_client == NULL)
goto out;
if (rqstp->rq_vers > 2)
error = nfserr_badhandle;
if (rqstp->rq_vers == 4 && fh->fh_size == 0)
return nfserr_nofilehandle;
if (fh->fh_version == 1) {
int len;
datap = fh->fh_auth;
if (--data_left<0) goto out;
switch (fh->fh_auth_type) {
case 0: break;
default: goto out;
}
len = key_len(fh->fh_fsid_type) / 4;
if (len == 0) goto out;
if (fh->fh_fsid_type == 2) {
/* deprecated, convert to type 3 */
len = 3;
fh->fh_fsid_type = 3;
fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl(fh->fh_fsid[0]), ntohl(fh->fh_fsid[1])));
fh->fh_fsid[1] = fh->fh_fsid[2];
}
if ((data_left -= len)<0) goto out;
exp = exp_find(rqstp->rq_client, fh->fh_fsid_type, datap, &rqstp->rq_chandle);
datap += len;
} else {
dev_t xdev;
ino_t xino;
if (fh->fh_size != NFS_FHSIZE)
goto out;
/* assume old filehandle format */
xdev = old_decode_dev(fh->ofh_xdev);
xino = u32_to_ino_t(fh->ofh_xino);
mk_fsid_v0(tfh, xdev, xino);
exp = exp_find(rqstp->rq_client, 0, tfh, &rqstp->rq_chandle);
}
error = nfserr_dropit;
if (IS_ERR(exp) && PTR_ERR(exp) == -EAGAIN)
goto out;
error = nfserr_stale;
if (!exp || IS_ERR(exp))
goto out;
/* Check if the request originated from a secure port. */
error = nfserr_perm;
if (!rqstp->rq_secure && EX_SECURE(exp)) {
printk(KERN_WARNING
"nfsd: request from insecure port (%08x:%d)!\n",
ntohl(rqstp->rq_addr.sin_addr.s_addr),
ntohs(rqstp->rq_addr.sin_port));
goto out;
}
/* Set user creds for this exportpoint */
error = nfsd_setuser(rqstp, exp);
if (error) {
error = nfserrno(error);
goto out;
}
/*
* Look up the dentry using the NFS file handle.
*/
error = nfserr_stale;
if (rqstp->rq_vers > 2)
error = nfserr_badhandle;
if (fh->fh_version != 1) {
tfh[0] = fh->ofh_ino;
tfh[1] = fh->ofh_generation;
tfh[2] = fh->ofh_dirino;
datap = tfh;
data_left = 3;
if (fh->ofh_dirino == 0)
fileid_type = 1;
else
fileid_type = 2;
} else
fileid_type = fh->fh_fileid_type;
if (fileid_type == 0)
dentry = dget(exp->ex_dentry);
else {
struct export_operations *nop = exp->ex_mnt->mnt_sb->s_export_op;
dentry = CALL(nop,decode_fh)(exp->ex_mnt->mnt_sb,
datap, data_left,
fileid_type,
nfsd_acceptable, exp);
}
if (dentry == NULL)
goto out;
if (IS_ERR(dentry)) {
if (PTR_ERR(dentry) != -EINVAL)
error = nfserrno(PTR_ERR(dentry));
goto out;
}
#ifdef NFSD_PARANOIA
if (S_ISDIR(dentry->d_inode->i_mode) &&
(dentry->d_flags & DCACHE_DISCONNECTED)) {
printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %s/%s\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
}
#endif
fhp->fh_dentry = dentry;
fhp->fh_export = exp;
nfsd_nr_verified++;
} else {
/* just rechecking permissions
* (e.g. nfsproc_create calls fh_verify, then nfsd_create does as well)
*/
dprintk("nfsd: fh_verify - just checking\n");
dentry = fhp->fh_dentry;
exp = fhp->fh_export;
}
cache_get(&exp->h);
inode = dentry->d_inode;
/* Type check. The correct error return for type mismatches
* does not seem to be generally agreed upon. SunOS seems to
* use EISDIR if file isn't S_IFREG; a comment in the NFSv3
* spec says this is incorrect (implementation notes for the
* write call).
*/
/* Type can be negative when creating hardlinks - not to a dir */
if (type > 0 && (inode->i_mode & S_IFMT) != type) {
if (rqstp->rq_vers == 4 && (inode->i_mode & S_IFMT) == S_IFLNK)
error = nfserr_symlink;
else if (type == S_IFDIR)
error = nfserr_notdir;
else if ((inode->i_mode & S_IFMT) == S_IFDIR)
error = nfserr_isdir;
else
error = nfserr_inval;
goto out;
}
if (type < 0 && (inode->i_mode & S_IFMT) == -type) {
if (rqstp->rq_vers == 4 && (inode->i_mode & S_IFMT) == S_IFLNK)
error = nfserr_symlink;
else if (type == -S_IFDIR)
error = nfserr_isdir;
else
error = nfserr_notdir;
goto out;
}
/* Finally, check access permissions. */
error = nfsd_permission(exp, dentry, access);
#ifdef NFSD_PARANOIA_EXTREME
if (error) {
printk("fh_verify: %s/%s permission failure, acc=%x, error=%d\n",
dentry->d_parent->d_name.name, dentry->d_name.name, access, (error >> 24));
}
#endif
out:
if (exp && !IS_ERR(exp))
exp_put(exp);
if (error == nfserr_stale)
nfsdstats.fh_stale++;
return error;
}
