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linux-zen-desktop/fs/nfsd/nfs4xdr.c

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2023-08-30 17:31:07 +02:00
/*
* Server-side XDR for NFSv4
*
* Copyright (c) 2002 The Regents of the University of Michigan.
* All rights reserved.
*
* Kendrick Smith <kmsmith@umich.edu>
* Andy Adamson <andros@umich.edu>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <linux/file.h>
#include <linux/slab.h>
#include <linux/namei.h>
#include <linux/statfs.h>
#include <linux/utsname.h>
#include <linux/pagemap.h>
#include <linux/sunrpc/svcauth_gss.h>
#include <linux/sunrpc/addr.h>
#include <linux/xattr.h>
#include <linux/vmalloc.h>
#include <uapi/linux/xattr.h>
#include "idmap.h"
#include "acl.h"
#include "xdr4.h"
#include "vfs.h"
#include "state.h"
#include "cache.h"
#include "netns.h"
#include "pnfs.h"
#include "filecache.h"
#include "trace.h"
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
#include <linux/security.h>
#endif
#define NFSDDBG_FACILITY NFSDDBG_XDR
const u32 nfsd_suppattrs[3][3] = {
{NFSD4_SUPPORTED_ATTRS_WORD0,
NFSD4_SUPPORTED_ATTRS_WORD1,
NFSD4_SUPPORTED_ATTRS_WORD2},
{NFSD4_1_SUPPORTED_ATTRS_WORD0,
NFSD4_1_SUPPORTED_ATTRS_WORD1,
NFSD4_1_SUPPORTED_ATTRS_WORD2},
{NFSD4_1_SUPPORTED_ATTRS_WORD0,
NFSD4_1_SUPPORTED_ATTRS_WORD1,
NFSD4_2_SUPPORTED_ATTRS_WORD2},
};
/*
* As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
* directory in order to indicate to the client that a filesystem boundary is present
* We use a fixed fsid for a referral
*/
#define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL
#define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL
static __be32
check_filename(char *str, int len)
{
int i;
if (len == 0)
return nfserr_inval;
if (len > NFS4_MAXNAMLEN)
return nfserr_nametoolong;
if (isdotent(str, len))
return nfserr_badname;
for (i = 0; i < len; i++)
if (str[i] == '/')
return nfserr_badname;
return 0;
}
static int zero_clientid(clientid_t *clid)
{
return (clid->cl_boot == 0) && (clid->cl_id == 0);
}
/**
* svcxdr_tmpalloc - allocate memory to be freed after compound processing
* @argp: NFSv4 compound argument structure
* @len: length of buffer to allocate
*
* Allocates a buffer of size @len to be freed when processing the compound
* operation described in @argp finishes.
*/
static void *
svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
{
struct svcxdr_tmpbuf *tb;
tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
if (!tb)
return NULL;
tb->next = argp->to_free;
argp->to_free = tb;
return tb->buf;
}
/*
* For xdr strings that need to be passed to other kernel api's
* as null-terminated strings.
*
* Note null-terminating in place usually isn't safe since the
* buffer might end on a page boundary.
*/
static char *
svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
{
char *p = svcxdr_tmpalloc(argp, len + 1);
if (!p)
return NULL;
memcpy(p, buf, len);
p[len] = '\0';
return p;
}
static void *
svcxdr_savemem(struct nfsd4_compoundargs *argp, __be32 *p, u32 len)
{
__be32 *tmp;
/*
* The location of the decoded data item is stable,
* so @p is OK to use. This is the common case.
*/
if (p != argp->xdr->scratch.iov_base)
return p;
tmp = svcxdr_tmpalloc(argp, len);
if (!tmp)
return NULL;
memcpy(tmp, p, len);
return tmp;
}
/*
* NFSv4 basic data type decoders
*/
/*
* This helper handles variable-length opaques which belong to protocol
* elements that this implementation does not support.
*/
static __be32
nfsd4_decode_ignored_string(struct nfsd4_compoundargs *argp, u32 maxlen)
{
u32 len;
if (xdr_stream_decode_u32(argp->xdr, &len) < 0)
return nfserr_bad_xdr;
if (maxlen && len > maxlen)
return nfserr_bad_xdr;
if (!xdr_inline_decode(argp->xdr, len))
return nfserr_bad_xdr;
return nfs_ok;
}
static __be32
nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
{
__be32 *p;
u32 len;
if (xdr_stream_decode_u32(argp->xdr, &len) < 0)
return nfserr_bad_xdr;
if (len == 0 || len > NFS4_OPAQUE_LIMIT)
return nfserr_bad_xdr;
p = xdr_inline_decode(argp->xdr, len);
if (!p)
return nfserr_bad_xdr;
o->data = svcxdr_savemem(argp, p, len);
if (!o->data)
return nfserr_jukebox;
o->len = len;
return nfs_ok;
}
static __be32
nfsd4_decode_component4(struct nfsd4_compoundargs *argp, char **namp, u32 *lenp)
{
__be32 *p, status;
if (xdr_stream_decode_u32(argp->xdr, lenp) < 0)
return nfserr_bad_xdr;
p = xdr_inline_decode(argp->xdr, *lenp);
if (!p)
return nfserr_bad_xdr;
status = check_filename((char *)p, *lenp);
if (status)
return status;
*namp = svcxdr_savemem(argp, p, *lenp);
if (!*namp)
return nfserr_jukebox;
return nfs_ok;
}
static __be32
nfsd4_decode_nfstime4(struct nfsd4_compoundargs *argp, struct timespec64 *tv)
{
__be32 *p;
p = xdr_inline_decode(argp->xdr, XDR_UNIT * 3);
if (!p)
return nfserr_bad_xdr;
p = xdr_decode_hyper(p, &tv->tv_sec);
tv->tv_nsec = be32_to_cpup(p++);
if (tv->tv_nsec >= (u32)1000000000)
return nfserr_inval;
return nfs_ok;
}
static __be32
nfsd4_decode_verifier4(struct nfsd4_compoundargs *argp, nfs4_verifier *verf)
{
__be32 *p;
p = xdr_inline_decode(argp->xdr, NFS4_VERIFIER_SIZE);
if (!p)
return nfserr_bad_xdr;
memcpy(verf->data, p, sizeof(verf->data));
return nfs_ok;
}
/**
* nfsd4_decode_bitmap4 - Decode an NFSv4 bitmap4
* @argp: NFSv4 compound argument structure
* @bmval: pointer to an array of u32's to decode into
* @bmlen: size of the @bmval array
*
* The server needs to return nfs_ok rather than nfserr_bad_xdr when
* encountering bitmaps containing bits it does not recognize. This
* includes bits in bitmap words past WORDn, where WORDn is the last
* bitmap WORD the implementation currently supports. Thus we are
* careful here to simply ignore bits in bitmap words that this
* implementation has yet to support explicitly.
*
* Return values:
* %nfs_ok: @bmval populated successfully
* %nfserr_bad_xdr: the encoded bitmap was invalid
*/
static __be32
nfsd4_decode_bitmap4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen)
{
ssize_t status;
status = xdr_stream_decode_uint32_array(argp->xdr, bmval, bmlen);
return status == -EBADMSG ? nfserr_bad_xdr : nfs_ok;
}
static __be32
nfsd4_decode_nfsace4(struct nfsd4_compoundargs *argp, struct nfs4_ace *ace)
{
__be32 *p, status;
u32 length;
if (xdr_stream_decode_u32(argp->xdr, &ace->type) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &ace->flag) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &ace->access_mask) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
return nfserr_bad_xdr;
p = xdr_inline_decode(argp->xdr, length);
if (!p)
return nfserr_bad_xdr;
ace->whotype = nfs4_acl_get_whotype((char *)p, length);
if (ace->whotype != NFS4_ACL_WHO_NAMED)
status = nfs_ok;
else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
status = nfsd_map_name_to_gid(argp->rqstp,
(char *)p, length, &ace->who_gid);
else
status = nfsd_map_name_to_uid(argp->rqstp,
(char *)p, length, &ace->who_uid);
return status;
}
/* A counted array of nfsace4's */
static noinline __be32
nfsd4_decode_acl(struct nfsd4_compoundargs *argp, struct nfs4_acl **acl)
{
struct nfs4_ace *ace;
__be32 status;
u32 count;
if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
return nfserr_bad_xdr;
if (count > xdr_stream_remaining(argp->xdr) / 20)
/*
* Even with 4-byte names there wouldn't be
* space for that many aces; something fishy is
* going on:
*/
return nfserr_fbig;
*acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(count));
if (*acl == NULL)
return nfserr_jukebox;
(*acl)->naces = count;
for (ace = (*acl)->aces; ace < (*acl)->aces + count; ace++) {
status = nfsd4_decode_nfsace4(argp, ace);
if (status)
return status;
}
return nfs_ok;
}
static noinline __be32
nfsd4_decode_security_label(struct nfsd4_compoundargs *argp,
struct xdr_netobj *label)
{
u32 lfs, pi, length;
__be32 *p;
if (xdr_stream_decode_u32(argp->xdr, &lfs) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &pi) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
return nfserr_bad_xdr;
if (length > NFS4_MAXLABELLEN)
return nfserr_badlabel;
p = xdr_inline_decode(argp->xdr, length);
if (!p)
return nfserr_bad_xdr;
label->len = length;
label->data = svcxdr_dupstr(argp, p, length);
if (!label->data)
return nfserr_jukebox;
return nfs_ok;
}
static __be32
nfsd4_decode_fattr4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen,
struct iattr *iattr, struct nfs4_acl **acl,
struct xdr_netobj *label, int *umask)
{
unsigned int starting_pos;
u32 attrlist4_count;
__be32 *p, status;
iattr->ia_valid = 0;
status = nfsd4_decode_bitmap4(argp, bmval, bmlen);
if (status)
return nfserr_bad_xdr;
if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
|| bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
|| bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) {
if (nfsd_attrs_supported(argp->minorversion, bmval))
return nfserr_inval;
return nfserr_attrnotsupp;
}
if (xdr_stream_decode_u32(argp->xdr, &attrlist4_count) < 0)
return nfserr_bad_xdr;
starting_pos = xdr_stream_pos(argp->xdr);
if (bmval[0] & FATTR4_WORD0_SIZE) {
u64 size;
if (xdr_stream_decode_u64(argp->xdr, &size) < 0)
return nfserr_bad_xdr;
iattr->ia_size = size;
iattr->ia_valid |= ATTR_SIZE;
}
if (bmval[0] & FATTR4_WORD0_ACL) {
status = nfsd4_decode_acl(argp, acl);
if (status)
return status;
} else
*acl = NULL;
if (bmval[1] & FATTR4_WORD1_MODE) {
u32 mode;
if (xdr_stream_decode_u32(argp->xdr, &mode) < 0)
return nfserr_bad_xdr;
iattr->ia_mode = mode;
iattr->ia_mode &= (S_IFMT | S_IALLUGO);
iattr->ia_valid |= ATTR_MODE;
}
if (bmval[1] & FATTR4_WORD1_OWNER) {
u32 length;
if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
return nfserr_bad_xdr;
p = xdr_inline_decode(argp->xdr, length);
if (!p)
return nfserr_bad_xdr;
status = nfsd_map_name_to_uid(argp->rqstp, (char *)p, length,
&iattr->ia_uid);
if (status)
return status;
iattr->ia_valid |= ATTR_UID;
}
if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
u32 length;
if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
return nfserr_bad_xdr;
p = xdr_inline_decode(argp->xdr, length);
if (!p)
return nfserr_bad_xdr;
status = nfsd_map_name_to_gid(argp->rqstp, (char *)p, length,
&iattr->ia_gid);
if (status)
return status;
iattr->ia_valid |= ATTR_GID;
}
if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
u32 set_it;
if (xdr_stream_decode_u32(argp->xdr, &set_it) < 0)
return nfserr_bad_xdr;
switch (set_it) {
case NFS4_SET_TO_CLIENT_TIME:
status = nfsd4_decode_nfstime4(argp, &iattr->ia_atime);
if (status)
return status;
iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
break;
case NFS4_SET_TO_SERVER_TIME:
iattr->ia_valid |= ATTR_ATIME;
break;
default:
return nfserr_bad_xdr;
}
}
if (bmval[1] & FATTR4_WORD1_TIME_CREATE) {
struct timespec64 ts;
/* No Linux filesystem supports setting this attribute. */
bmval[1] &= ~FATTR4_WORD1_TIME_CREATE;
status = nfsd4_decode_nfstime4(argp, &ts);
if (status)
return status;
}
if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
u32 set_it;
if (xdr_stream_decode_u32(argp->xdr, &set_it) < 0)
return nfserr_bad_xdr;
switch (set_it) {
case NFS4_SET_TO_CLIENT_TIME:
status = nfsd4_decode_nfstime4(argp, &iattr->ia_mtime);
if (status)
return status;
iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
break;
case NFS4_SET_TO_SERVER_TIME:
iattr->ia_valid |= ATTR_MTIME;
break;
default:
return nfserr_bad_xdr;
}
}
label->len = 0;
if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) &&
bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
status = nfsd4_decode_security_label(argp, label);
if (status)
return status;
}
if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
u32 mode, mask;
if (!umask)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &mode) < 0)
return nfserr_bad_xdr;
iattr->ia_mode = mode & (S_IFMT | S_IALLUGO);
if (xdr_stream_decode_u32(argp->xdr, &mask) < 0)
return nfserr_bad_xdr;
*umask = mask & S_IRWXUGO;
iattr->ia_valid |= ATTR_MODE;
}
/* request sanity: did attrlist4 contain the expected number of words? */
if (attrlist4_count != xdr_stream_pos(argp->xdr) - starting_pos)
return nfserr_bad_xdr;
return nfs_ok;
}
static __be32
nfsd4_decode_stateid4(struct nfsd4_compoundargs *argp, stateid_t *sid)
{
__be32 *p;
p = xdr_inline_decode(argp->xdr, NFS4_STATEID_SIZE);
if (!p)
return nfserr_bad_xdr;
sid->si_generation = be32_to_cpup(p++);
memcpy(&sid->si_opaque, p, sizeof(sid->si_opaque));
return nfs_ok;
}
static __be32
nfsd4_decode_clientid4(struct nfsd4_compoundargs *argp, clientid_t *clientid)
{
__be32 *p;
p = xdr_inline_decode(argp->xdr, sizeof(__be64));
if (!p)
return nfserr_bad_xdr;
memcpy(clientid, p, sizeof(*clientid));
return nfs_ok;
}
static __be32
nfsd4_decode_state_owner4(struct nfsd4_compoundargs *argp,
clientid_t *clientid, struct xdr_netobj *owner)
{
__be32 status;
status = nfsd4_decode_clientid4(argp, clientid);
if (status)
return status;
return nfsd4_decode_opaque(argp, owner);
}
#ifdef CONFIG_NFSD_PNFS
static __be32
nfsd4_decode_deviceid4(struct nfsd4_compoundargs *argp,
struct nfsd4_deviceid *devid)
{
__be32 *p;
p = xdr_inline_decode(argp->xdr, NFS4_DEVICEID4_SIZE);
if (!p)
return nfserr_bad_xdr;
memcpy(devid, p, sizeof(*devid));
return nfs_ok;
}
static __be32
nfsd4_decode_layoutupdate4(struct nfsd4_compoundargs *argp,
struct nfsd4_layoutcommit *lcp)
{
if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_layout_type) < 0)
return nfserr_bad_xdr;
if (lcp->lc_layout_type < LAYOUT_NFSV4_1_FILES)
return nfserr_bad_xdr;
if (lcp->lc_layout_type >= LAYOUT_TYPE_MAX)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_up_len) < 0)
return nfserr_bad_xdr;
if (lcp->lc_up_len > 0) {
lcp->lc_up_layout = xdr_inline_decode(argp->xdr, lcp->lc_up_len);
if (!lcp->lc_up_layout)
return nfserr_bad_xdr;
}
return nfs_ok;
}
static __be32
nfsd4_decode_layoutreturn4(struct nfsd4_compoundargs *argp,
struct nfsd4_layoutreturn *lrp)
{
__be32 status;
if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_return_type) < 0)
return nfserr_bad_xdr;
switch (lrp->lr_return_type) {
case RETURN_FILE:
if (xdr_stream_decode_u64(argp->xdr, &lrp->lr_seg.offset) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u64(argp->xdr, &lrp->lr_seg.length) < 0)
return nfserr_bad_xdr;
status = nfsd4_decode_stateid4(argp, &lrp->lr_sid);
if (status)
return status;
if (xdr_stream_decode_u32(argp->xdr, &lrp->lrf_body_len) < 0)
return nfserr_bad_xdr;
if (lrp->lrf_body_len > 0) {
lrp->lrf_body = xdr_inline_decode(argp->xdr, lrp->lrf_body_len);
if (!lrp->lrf_body)
return nfserr_bad_xdr;
}
break;
case RETURN_FSID:
case RETURN_ALL:
lrp->lr_seg.offset = 0;
lrp->lr_seg.length = NFS4_MAX_UINT64;
break;
default:
return nfserr_bad_xdr;
}
return nfs_ok;
}
#endif /* CONFIG_NFSD_PNFS */
static __be32
nfsd4_decode_sessionid4(struct nfsd4_compoundargs *argp,
struct nfs4_sessionid *sessionid)
{
__be32 *p;
p = xdr_inline_decode(argp->xdr, NFS4_MAX_SESSIONID_LEN);
if (!p)
return nfserr_bad_xdr;
memcpy(sessionid->data, p, sizeof(sessionid->data));
return nfs_ok;
}
/* Defined in Appendix A of RFC 5531 */
static __be32
nfsd4_decode_authsys_parms(struct nfsd4_compoundargs *argp,
struct nfsd4_cb_sec *cbs)
{
u32 stamp, gidcount, uid, gid;
__be32 *p, status;
if (xdr_stream_decode_u32(argp->xdr, &stamp) < 0)
return nfserr_bad_xdr;
/* machine name */
status = nfsd4_decode_ignored_string(argp, 255);
if (status)
return status;
if (xdr_stream_decode_u32(argp->xdr, &uid) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &gid) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &gidcount) < 0)
return nfserr_bad_xdr;
if (gidcount > 16)
return nfserr_bad_xdr;
p = xdr_inline_decode(argp->xdr, gidcount << 2);
if (!p)
return nfserr_bad_xdr;
if (cbs->flavor == (u32)(-1)) {
struct user_namespace *userns = nfsd_user_namespace(argp->rqstp);
kuid_t kuid = make_kuid(userns, uid);
kgid_t kgid = make_kgid(userns, gid);
if (uid_valid(kuid) && gid_valid(kgid)) {
cbs->uid = kuid;
cbs->gid = kgid;
cbs->flavor = RPC_AUTH_UNIX;
} else {
dprintk("RPC_AUTH_UNIX with invalid uid or gid, ignoring!\n");
}
}
return nfs_ok;
}
static __be32
nfsd4_decode_gss_cb_handles4(struct nfsd4_compoundargs *argp,
struct nfsd4_cb_sec *cbs)
{
__be32 status;
u32 service;
dprintk("RPC_AUTH_GSS callback secflavor not supported!\n");
if (xdr_stream_decode_u32(argp->xdr, &service) < 0)
return nfserr_bad_xdr;
if (service < RPC_GSS_SVC_NONE || service > RPC_GSS_SVC_PRIVACY)
return nfserr_bad_xdr;
/* gcbp_handle_from_server */
status = nfsd4_decode_ignored_string(argp, 0);
if (status)
return status;
/* gcbp_handle_from_client */
status = nfsd4_decode_ignored_string(argp, 0);
if (status)
return status;
return nfs_ok;
}
/* a counted array of callback_sec_parms4 items */
static __be32
nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
{
u32 i, secflavor, nr_secflavs;
__be32 status;
/* callback_sec_params4 */
if (xdr_stream_decode_u32(argp->xdr, &nr_secflavs) < 0)
return nfserr_bad_xdr;
if (nr_secflavs)
cbs->flavor = (u32)(-1);
else
/* Is this legal? Be generous, take it to mean AUTH_NONE: */
cbs->flavor = 0;
for (i = 0; i < nr_secflavs; ++i) {
if (xdr_stream_decode_u32(argp->xdr, &secflavor) < 0)
return nfserr_bad_xdr;
switch (secflavor) {
case RPC_AUTH_NULL:
/* void */
if (cbs->flavor == (u32)(-1))
cbs->flavor = RPC_AUTH_NULL;
break;
case RPC_AUTH_UNIX:
status = nfsd4_decode_authsys_parms(argp, cbs);
if (status)
return status;
break;
case RPC_AUTH_GSS:
status = nfsd4_decode_gss_cb_handles4(argp, cbs);
if (status)
return status;
break;
default:
return nfserr_inval;
}
}
return nfs_ok;
}
/*
* NFSv4 operation argument decoders
*/
static __be32
nfsd4_decode_access(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_access *access = &u->access;
if (xdr_stream_decode_u32(argp->xdr, &access->ac_req_access) < 0)
return nfserr_bad_xdr;
return nfs_ok;
}
static __be32
nfsd4_decode_close(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
{
struct nfsd4_close *close = &u->close;
if (xdr_stream_decode_u32(argp->xdr, &close->cl_seqid) < 0)
return nfserr_bad_xdr;
return nfsd4_decode_stateid4(argp, &close->cl_stateid);
}
static __be32
nfsd4_decode_commit(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
{
struct nfsd4_commit *commit = &u->commit;
if (xdr_stream_decode_u64(argp->xdr, &commit->co_offset) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &commit->co_count) < 0)
return nfserr_bad_xdr;
memset(&commit->co_verf, 0, sizeof(commit->co_verf));
return nfs_ok;
}
static __be32
nfsd4_decode_create(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
{
struct nfsd4_create *create = &u->create;
__be32 *p, status;
memset(create, 0, sizeof(*create));
if (xdr_stream_decode_u32(argp->xdr, &create->cr_type) < 0)
return nfserr_bad_xdr;
switch (create->cr_type) {
case NF4LNK:
if (xdr_stream_decode_u32(argp->xdr, &create->cr_datalen) < 0)
return nfserr_bad_xdr;
p = xdr_inline_decode(argp->xdr, create->cr_datalen);
if (!p)
return nfserr_bad_xdr;
create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
if (!create->cr_data)
return nfserr_jukebox;
break;
case NF4BLK:
case NF4CHR:
if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata1) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata2) < 0)
return nfserr_bad_xdr;
break;
case NF4SOCK:
case NF4FIFO:
case NF4DIR:
default:
break;
}
status = nfsd4_decode_component4(argp, &create->cr_name,
&create->cr_namelen);
if (status)
return status;
status = nfsd4_decode_fattr4(argp, create->cr_bmval,
ARRAY_SIZE(create->cr_bmval),
&create->cr_iattr, &create->cr_acl,
&create->cr_label, &create->cr_umask);
if (status)
return status;
return nfs_ok;
}
static inline __be32
nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
{
struct nfsd4_delegreturn *dr = &u->delegreturn;
return nfsd4_decode_stateid4(argp, &dr->dr_stateid);
}
static inline __be32
nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
{
struct nfsd4_getattr *getattr = &u->getattr;
memset(getattr, 0, sizeof(*getattr));
return nfsd4_decode_bitmap4(argp, getattr->ga_bmval,
ARRAY_SIZE(getattr->ga_bmval));
}
static __be32
nfsd4_decode_link(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
{
struct nfsd4_link *link = &u->link;
memset(link, 0, sizeof(*link));
return nfsd4_decode_component4(argp, &link->li_name, &link->li_namelen);
}
static __be32
nfsd4_decode_open_to_lock_owner4(struct nfsd4_compoundargs *argp,
struct nfsd4_lock *lock)
{
__be32 status;
if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_open_seqid) < 0)
return nfserr_bad_xdr;
status = nfsd4_decode_stateid4(argp, &lock->lk_new_open_stateid);
if (status)
return status;
if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_lock_seqid) < 0)
return nfserr_bad_xdr;
return nfsd4_decode_state_owner4(argp, &lock->lk_new_clientid,
&lock->lk_new_owner);
}
static __be32
nfsd4_decode_exist_lock_owner4(struct nfsd4_compoundargs *argp,
struct nfsd4_lock *lock)
{
__be32 status;
status = nfsd4_decode_stateid4(argp, &lock->lk_old_lock_stateid);
if (status)
return status;
if (xdr_stream_decode_u32(argp->xdr, &lock->lk_old_lock_seqid) < 0)
return nfserr_bad_xdr;
return nfs_ok;
}
static __be32
nfsd4_decode_locker4(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
{
if (xdr_stream_decode_bool(argp->xdr, &lock->lk_is_new) < 0)
return nfserr_bad_xdr;
if (lock->lk_is_new)
return nfsd4_decode_open_to_lock_owner4(argp, lock);
return nfsd4_decode_exist_lock_owner4(argp, lock);
}
static __be32
nfsd4_decode_lock(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
{
struct nfsd4_lock *lock = &u->lock;
memset(lock, 0, sizeof(*lock));
if (xdr_stream_decode_u32(argp->xdr, &lock->lk_type) < 0)
return nfserr_bad_xdr;
if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
return nfserr_bad_xdr;
if (xdr_stream_decode_bool(argp->xdr, &lock->lk_reclaim) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u64(argp->xdr, &lock->lk_offset) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u64(argp->xdr, &lock->lk_length) < 0)
return nfserr_bad_xdr;
return nfsd4_decode_locker4(argp, lock);
}
static __be32
nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
{
struct nfsd4_lockt *lockt = &u->lockt;
memset(lockt, 0, sizeof(*lockt));
if (xdr_stream_decode_u32(argp->xdr, &lockt->lt_type) < 0)
return nfserr_bad_xdr;
if ((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
return nfserr_bad_xdr;
if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_offset) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_length) < 0)
return nfserr_bad_xdr;
return nfsd4_decode_state_owner4(argp, &lockt->lt_clientid,
&lockt->lt_owner);
}
static __be32
nfsd4_decode_locku(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
{
struct nfsd4_locku *locku = &u->locku;
__be32 status;
if (xdr_stream_decode_u32(argp->xdr, &locku->lu_type) < 0)
return nfserr_bad_xdr;
if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &locku->lu_seqid) < 0)
return nfserr_bad_xdr;
status = nfsd4_decode_stateid4(argp, &locku->lu_stateid);
if (status)
return status;
if (xdr_stream_decode_u64(argp->xdr, &locku->lu_offset) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u64(argp->xdr, &locku->lu_length) < 0)
return nfserr_bad_xdr;
return nfs_ok;
}
static __be32
nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
{
struct nfsd4_lookup *lookup = &u->lookup;
return nfsd4_decode_component4(argp, &lookup->lo_name, &lookup->lo_len);
}
static __be32
nfsd4_decode_createhow4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
{
__be32 status;
if (xdr_stream_decode_u32(argp->xdr, &open->op_createmode) < 0)
return nfserr_bad_xdr;
switch (open->op_createmode) {
case NFS4_CREATE_UNCHECKED:
case NFS4_CREATE_GUARDED:
status = nfsd4_decode_fattr4(argp, open->op_bmval,
ARRAY_SIZE(open->op_bmval),
&open->op_iattr, &open->op_acl,
&open->op_label, &open->op_umask);
if (status)
return status;
break;
case NFS4_CREATE_EXCLUSIVE:
status = nfsd4_decode_verifier4(argp, &open->op_verf);
if (status)
return status;
break;
case NFS4_CREATE_EXCLUSIVE4_1:
if (argp->minorversion < 1)
return nfserr_bad_xdr;
status = nfsd4_decode_verifier4(argp, &open->op_verf);
if (status)
return status;
status = nfsd4_decode_fattr4(argp, open->op_bmval,
ARRAY_SIZE(open->op_bmval),
&open->op_iattr, &open->op_acl,
&open->op_label, &open->op_umask);
if (status)
return status;
break;
default:
return nfserr_bad_xdr;
}
return nfs_ok;
}
static __be32
nfsd4_decode_openflag4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
{
__be32 status;
if (xdr_stream_decode_u32(argp->xdr, &open->op_create) < 0)
return nfserr_bad_xdr;
switch (open->op_create) {
case NFS4_OPEN_NOCREATE:
break;
case NFS4_OPEN_CREATE:
status = nfsd4_decode_createhow4(argp, open);
if (status)
return status;
break;
default:
return nfserr_bad_xdr;
}
return nfs_ok;
}
static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
{
u32 w;
if (xdr_stream_decode_u32(argp->xdr, &w) < 0)
return nfserr_bad_xdr;
*share_access = w & NFS4_SHARE_ACCESS_MASK;
*deleg_want = w & NFS4_SHARE_WANT_MASK;
if (deleg_when)
*deleg_when = w & NFS4_SHARE_WHEN_MASK;
switch (w & NFS4_SHARE_ACCESS_MASK) {
case NFS4_SHARE_ACCESS_READ:
case NFS4_SHARE_ACCESS_WRITE:
case NFS4_SHARE_ACCESS_BOTH:
break;
default:
return nfserr_bad_xdr;
}
w &= ~NFS4_SHARE_ACCESS_MASK;
if (!w)
return nfs_ok;
if (!argp->minorversion)
return nfserr_bad_xdr;
switch (w & NFS4_SHARE_WANT_MASK) {
case NFS4_SHARE_WANT_NO_PREFERENCE:
case NFS4_SHARE_WANT_READ_DELEG:
case NFS4_SHARE_WANT_WRITE_DELEG:
case NFS4_SHARE_WANT_ANY_DELEG:
case NFS4_SHARE_WANT_NO_DELEG:
case NFS4_SHARE_WANT_CANCEL:
break;
default:
return nfserr_bad_xdr;
}
w &= ~NFS4_SHARE_WANT_MASK;
if (!w)
return nfs_ok;
if (!deleg_when) /* open_downgrade */
return nfserr_inval;
switch (w) {
case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
return nfs_ok;
}
return nfserr_bad_xdr;
}
static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
{
if (xdr_stream_decode_u32(argp->xdr, x) < 0)
return nfserr_bad_xdr;
/* Note: unlike access bits, deny bits may be zero. */
if (*x & ~NFS4_SHARE_DENY_BOTH)
return nfserr_bad_xdr;
return nfs_ok;
}
static __be32
nfsd4_decode_open_claim4(struct nfsd4_compoundargs *argp,
struct nfsd4_open *open)
{
__be32 status;
if (xdr_stream_decode_u32(argp->xdr, &open->op_claim_type) < 0)
return nfserr_bad_xdr;
switch (open->op_claim_type) {
case NFS4_OPEN_CLAIM_NULL:
case NFS4_OPEN_CLAIM_DELEGATE_PREV:
status = nfsd4_decode_component4(argp, &open->op_fname,
&open->op_fnamelen);
if (status)
return status;
break;
case NFS4_OPEN_CLAIM_PREVIOUS:
if (xdr_stream_decode_u32(argp->xdr, &open->op_delegate_type) < 0)
return nfserr_bad_xdr;
break;
case NFS4_OPEN_CLAIM_DELEGATE_CUR:
status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid);
if (status)
return status;
status = nfsd4_decode_component4(argp, &open->op_fname,
&open->op_fnamelen);
if (status)
return status;
break;
case NFS4_OPEN_CLAIM_FH:
case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
if (argp->minorversion < 1)
return nfserr_bad_xdr;
/* void */
break;
case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
if (argp->minorversion < 1)
return nfserr_bad_xdr;
status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid);
if (status)
return status;
break;
default:
return nfserr_bad_xdr;
}
return nfs_ok;
}
static __be32
nfsd4_decode_open(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
{
struct nfsd4_open *open = &u->open;
__be32 status;
u32 dummy;
memset(open, 0, sizeof(*open));
if (xdr_stream_decode_u32(argp->xdr, &open->op_seqid) < 0)
return nfserr_bad_xdr;
/* deleg_want is ignored */
status = nfsd4_decode_share_access(argp, &open->op_share_access,
&open->op_deleg_want, &dummy);
if (status)
return status;
status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
if (status)
return status;
status = nfsd4_decode_state_owner4(argp, &open->op_clientid,
&open->op_owner);
if (status)
return status;
status = nfsd4_decode_openflag4(argp, open);
if (status)
return status;
return nfsd4_decode_open_claim4(argp, open);
}
static __be32
nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_open_confirm *open_conf = &u->open_confirm;
__be32 status;
if (argp->minorversion >= 1)
return nfserr_notsupp;
status = nfsd4_decode_stateid4(argp, &open_conf->oc_req_stateid);
if (status)
return status;
if (xdr_stream_decode_u32(argp->xdr, &open_conf->oc_seqid) < 0)
return nfserr_bad_xdr;
memset(&open_conf->oc_resp_stateid, 0,
sizeof(open_conf->oc_resp_stateid));
return nfs_ok;
}
static __be32
nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_open_downgrade *open_down = &u->open_downgrade;
__be32 status;
memset(open_down, 0, sizeof(*open_down));
status = nfsd4_decode_stateid4(argp, &open_down->od_stateid);
if (status)
return status;
if (xdr_stream_decode_u32(argp->xdr, &open_down->od_seqid) < 0)
return nfserr_bad_xdr;
/* deleg_want is ignored */
status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
&open_down->od_deleg_want, NULL);
if (status)
return status;
return nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
}
static __be32
nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
{
struct nfsd4_putfh *putfh = &u->putfh;
__be32 *p;
if (xdr_stream_decode_u32(argp->xdr, &putfh->pf_fhlen) < 0)
return nfserr_bad_xdr;
if (putfh->pf_fhlen > NFS4_FHSIZE)
return nfserr_bad_xdr;
p = xdr_inline_decode(argp->xdr, putfh->pf_fhlen);
if (!p)
return nfserr_bad_xdr;
putfh->pf_fhval = svcxdr_savemem(argp, p, putfh->pf_fhlen);
if (!putfh->pf_fhval)
return nfserr_jukebox;
putfh->no_verify = false;
return nfs_ok;
}
static __be32
nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p)
{
if (argp->minorversion == 0)
return nfs_ok;
return nfserr_notsupp;
}
static __be32
nfsd4_decode_read(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
{
struct nfsd4_read *read = &u->read;
__be32 status;
memset(read, 0, sizeof(*read));
status = nfsd4_decode_stateid4(argp, &read->rd_stateid);
if (status)
return status;
if (xdr_stream_decode_u64(argp->xdr, &read->rd_offset) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &read->rd_length) < 0)
return nfserr_bad_xdr;
return nfs_ok;
}
static __be32
nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
{
struct nfsd4_readdir *readdir = &u->readdir;
__be32 status;
memset(readdir, 0, sizeof(*readdir));
if (xdr_stream_decode_u64(argp->xdr, &readdir->rd_cookie) < 0)
return nfserr_bad_xdr;
status = nfsd4_decode_verifier4(argp, &readdir->rd_verf);
if (status)
return status;
if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_dircount) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_maxcount) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_uint32_array(argp->xdr, readdir->rd_bmval,
ARRAY_SIZE(readdir->rd_bmval)) < 0)
return nfserr_bad_xdr;
return nfs_ok;
}
static __be32
nfsd4_decode_remove(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
{
struct nfsd4_remove *remove = &u->remove;
memset(&remove->rm_cinfo, 0, sizeof(remove->rm_cinfo));
return nfsd4_decode_component4(argp, &remove->rm_name, &remove->rm_namelen);
}
static __be32
nfsd4_decode_rename(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
{
struct nfsd4_rename *rename = &u->rename;
__be32 status;
memset(rename, 0, sizeof(*rename));
status = nfsd4_decode_component4(argp, &rename->rn_sname, &rename->rn_snamelen);
if (status)
return status;
return nfsd4_decode_component4(argp, &rename->rn_tname, &rename->rn_tnamelen);
}
static __be32
nfsd4_decode_renew(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
{
clientid_t *clientid = &u->renew;
return nfsd4_decode_clientid4(argp, clientid);
}
static __be32
nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_secinfo *secinfo = &u->secinfo;
secinfo->si_exp = NULL;
return nfsd4_decode_component4(argp, &secinfo->si_name, &secinfo->si_namelen);
}
static __be32
nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
{
struct nfsd4_setattr *setattr = &u->setattr;
__be32 status;
memset(setattr, 0, sizeof(*setattr));
status = nfsd4_decode_stateid4(argp, &setattr->sa_stateid);
if (status)
return status;
return nfsd4_decode_fattr4(argp, setattr->sa_bmval,
ARRAY_SIZE(setattr->sa_bmval),
&setattr->sa_iattr, &setattr->sa_acl,
&setattr->sa_label, NULL);
}
static __be32
nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
{
struct nfsd4_setclientid *setclientid = &u->setclientid;
__be32 *p, status;
memset(setclientid, 0, sizeof(*setclientid));
if (argp->minorversion >= 1)
return nfserr_notsupp;
status = nfsd4_decode_verifier4(argp, &setclientid->se_verf);
if (status)
return status;
status = nfsd4_decode_opaque(argp, &setclientid->se_name);
if (status)
return status;
if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_prog) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_netid_len) < 0)
return nfserr_bad_xdr;
p = xdr_inline_decode(argp->xdr, setclientid->se_callback_netid_len);
if (!p)
return nfserr_bad_xdr;
setclientid->se_callback_netid_val = svcxdr_savemem(argp, p,
setclientid->se_callback_netid_len);
if (!setclientid->se_callback_netid_val)
return nfserr_jukebox;
if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_addr_len) < 0)
return nfserr_bad_xdr;
p = xdr_inline_decode(argp->xdr, setclientid->se_callback_addr_len);
if (!p)
return nfserr_bad_xdr;
setclientid->se_callback_addr_val = svcxdr_savemem(argp, p,
setclientid->se_callback_addr_len);
if (!setclientid->se_callback_addr_val)
return nfserr_jukebox;
if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_ident) < 0)
return nfserr_bad_xdr;
return nfs_ok;
}
static __be32
nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_setclientid_confirm *scd_c = &u->setclientid_confirm;
__be32 status;
if (argp->minorversion >= 1)
return nfserr_notsupp;
status = nfsd4_decode_clientid4(argp, &scd_c->sc_clientid);
if (status)
return status;
return nfsd4_decode_verifier4(argp, &scd_c->sc_confirm);
}
/* Also used for NVERIFY */
static __be32
nfsd4_decode_verify(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
{
struct nfsd4_verify *verify = &u->verify;
__be32 *p, status;
memset(verify, 0, sizeof(*verify));
status = nfsd4_decode_bitmap4(argp, verify->ve_bmval,
ARRAY_SIZE(verify->ve_bmval));
if (status)
return status;
/* For convenience's sake, we compare raw xdr'd attributes in
* nfsd4_proc_verify */
if (xdr_stream_decode_u32(argp->xdr, &verify->ve_attrlen) < 0)
return nfserr_bad_xdr;
p = xdr_inline_decode(argp->xdr, verify->ve_attrlen);
if (!p)
return nfserr_bad_xdr;
verify->ve_attrval = svcxdr_savemem(argp, p, verify->ve_attrlen);
if (!verify->ve_attrval)
return nfserr_jukebox;
return nfs_ok;
}
static __be32
nfsd4_decode_write(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
{
struct nfsd4_write *write = &u->write;
__be32 status;
status = nfsd4_decode_stateid4(argp, &write->wr_stateid);
if (status)
return status;
if (xdr_stream_decode_u64(argp->xdr, &write->wr_offset) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &write->wr_stable_how) < 0)
return nfserr_bad_xdr;
if (write->wr_stable_how > NFS_FILE_SYNC)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &write->wr_buflen) < 0)
return nfserr_bad_xdr;
if (!xdr_stream_subsegment(argp->xdr, &write->wr_payload, write->wr_buflen))
return nfserr_bad_xdr;
write->wr_bytes_written = 0;
write->wr_how_written = 0;
memset(&write->wr_verifier, 0, sizeof(write->wr_verifier));
return nfs_ok;
}
static __be32
nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner;
__be32 status;
if (argp->minorversion >= 1)
return nfserr_notsupp;
status = nfsd4_decode_state_owner4(argp, &rlockowner->rl_clientid,
&rlockowner->rl_owner);
if (status)
return status;
if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
return nfserr_inval;
return nfs_ok;
}
static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl;
memset(bc, 0, sizeof(*bc));
if (xdr_stream_decode_u32(argp->xdr, &bc->bc_cb_program) < 0)
return nfserr_bad_xdr;
return nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
}
static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
u32 use_conn_in_rdma_mode;
__be32 status;
memset(bcts, 0, sizeof(*bcts));
status = nfsd4_decode_sessionid4(argp, &bcts->sessionid);
if (status)
return status;
if (xdr_stream_decode_u32(argp->xdr, &bcts->dir) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &use_conn_in_rdma_mode) < 0)
return nfserr_bad_xdr;
return nfs_ok;
}
static __be32
nfsd4_decode_state_protect_ops(struct nfsd4_compoundargs *argp,
struct nfsd4_exchange_id *exid)
{
__be32 status;
status = nfsd4_decode_bitmap4(argp, exid->spo_must_enforce,
ARRAY_SIZE(exid->spo_must_enforce));
if (status)
return nfserr_bad_xdr;
status = nfsd4_decode_bitmap4(argp, exid->spo_must_allow,
ARRAY_SIZE(exid->spo_must_allow));
if (status)
return nfserr_bad_xdr;
return nfs_ok;
}
/*
* This implementation currently does not support SP4_SSV.
* This decoder simply skips over these arguments.
*/
static noinline __be32
nfsd4_decode_ssv_sp_parms(struct nfsd4_compoundargs *argp,
struct nfsd4_exchange_id *exid)
{
u32 count, window, num_gss_handles;
__be32 status;
/* ssp_ops */
status = nfsd4_decode_state_protect_ops(argp, exid);
if (status)
return status;
/* ssp_hash_algs<> */
if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
return nfserr_bad_xdr;
while (count--) {
status = nfsd4_decode_ignored_string(argp, 0);
if (status)
return status;
}
/* ssp_encr_algs<> */
if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
return nfserr_bad_xdr;
while (count--) {
status = nfsd4_decode_ignored_string(argp, 0);
if (status)
return status;
}
if (xdr_stream_decode_u32(argp->xdr, &window) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &num_gss_handles) < 0)
return nfserr_bad_xdr;
return nfs_ok;
}
static __be32
nfsd4_decode_state_protect4_a(struct nfsd4_compoundargs *argp,
struct nfsd4_exchange_id *exid)
{
__be32 status;
if (xdr_stream_decode_u32(argp->xdr, &exid->spa_how) < 0)
return nfserr_bad_xdr;
switch (exid->spa_how) {
case SP4_NONE:
break;
case SP4_MACH_CRED:
status = nfsd4_decode_state_protect_ops(argp, exid);
if (status)
return status;
break;
case SP4_SSV:
status = nfsd4_decode_ssv_sp_parms(argp, exid);
if (status)
return status;
break;
default:
return nfserr_bad_xdr;
}
return nfs_ok;
}
static __be32
nfsd4_decode_nfs_impl_id4(struct nfsd4_compoundargs *argp,
struct nfsd4_exchange_id *exid)
{
__be32 status;
u32 count;
if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
return nfserr_bad_xdr;
switch (count) {
case 0:
break;
case 1:
/* Note that RFC 8881 places no length limit on
* nii_domain, but this implementation permits no
* more than NFS4_OPAQUE_LIMIT bytes */
status = nfsd4_decode_opaque(argp, &exid->nii_domain);
if (status)
return status;
/* Note that RFC 8881 places no length limit on
* nii_name, but this implementation permits no
* more than NFS4_OPAQUE_LIMIT bytes */
status = nfsd4_decode_opaque(argp, &exid->nii_name);
if (status)
return status;
status = nfsd4_decode_nfstime4(argp, &exid->nii_time);
if (status)
return status;
break;
default:
return nfserr_bad_xdr;
}
return nfs_ok;
}
static __be32
nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_exchange_id *exid = &u->exchange_id;
__be32 status;
memset(exid, 0, sizeof(*exid));
status = nfsd4_decode_verifier4(argp, &exid->verifier);
if (status)
return status;
status = nfsd4_decode_opaque(argp, &exid->clname);
if (status)
return status;
if (xdr_stream_decode_u32(argp->xdr, &exid->flags) < 0)
return nfserr_bad_xdr;
status = nfsd4_decode_state_protect4_a(argp, exid);
if (status)
return status;
return nfsd4_decode_nfs_impl_id4(argp, exid);
}
static __be32
nfsd4_decode_channel_attrs4(struct nfsd4_compoundargs *argp,
struct nfsd4_channel_attrs *ca)
{
__be32 *p;
p = xdr_inline_decode(argp->xdr, XDR_UNIT * 7);
if (!p)
return nfserr_bad_xdr;
/* headerpadsz is ignored */
p++;
ca->maxreq_sz = be32_to_cpup(p++);
ca->maxresp_sz = be32_to_cpup(p++);
ca->maxresp_cached = be32_to_cpup(p++);
ca->maxops = be32_to_cpup(p++);
ca->maxreqs = be32_to_cpup(p++);
ca->nr_rdma_attrs = be32_to_cpup(p);
switch (ca->nr_rdma_attrs) {
case 0:
break;
case 1:
if (xdr_stream_decode_u32(argp->xdr, &ca->rdma_attrs) < 0)
return nfserr_bad_xdr;
break;
default:
return nfserr_bad_xdr;
}
return nfs_ok;
}
static __be32
nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_create_session *sess = &u->create_session;
__be32 status;
memset(sess, 0, sizeof(*sess));
status = nfsd4_decode_clientid4(argp, &sess->clientid);
if (status)
return status;
if (xdr_stream_decode_u32(argp->xdr, &sess->seqid) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &sess->flags) < 0)
return nfserr_bad_xdr;
status = nfsd4_decode_channel_attrs4(argp, &sess->fore_channel);
if (status)
return status;
status = nfsd4_decode_channel_attrs4(argp, &sess->back_channel);
if (status)
return status;
if (xdr_stream_decode_u32(argp->xdr, &sess->callback_prog) < 0)
return nfserr_bad_xdr;
return nfsd4_decode_cb_sec(argp, &sess->cb_sec);
}
static __be32
nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_destroy_session *destroy_session = &u->destroy_session;
return nfsd4_decode_sessionid4(argp, &destroy_session->sessionid);
}
static __be32
nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_free_stateid *free_stateid = &u->free_stateid;
return nfsd4_decode_stateid4(argp, &free_stateid->fr_stateid);
}
#ifdef CONFIG_NFSD_PNFS
static __be32
nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_getdeviceinfo *gdev = &u->getdeviceinfo;
__be32 status;
memset(gdev, 0, sizeof(*gdev));
status = nfsd4_decode_deviceid4(argp, &gdev->gd_devid);
if (status)
return status;
if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_layout_type) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_maxcount) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_uint32_array(argp->xdr,
&gdev->gd_notify_types, 1) < 0)
return nfserr_bad_xdr;
return nfs_ok;
}
static __be32
nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
__be32 *p, status;
memset(lcp, 0, sizeof(*lcp));
if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.offset) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.length) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_bool(argp->xdr, &lcp->lc_reclaim) < 0)
return nfserr_bad_xdr;
status = nfsd4_decode_stateid4(argp, &lcp->lc_sid);
if (status)
return status;
if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_newoffset) < 0)
return nfserr_bad_xdr;
if (lcp->lc_newoffset) {
if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_last_wr) < 0)
return nfserr_bad_xdr;
} else
lcp->lc_last_wr = 0;
p = xdr_inline_decode(argp->xdr, XDR_UNIT);
if (!p)
return nfserr_bad_xdr;
if (xdr_item_is_present(p)) {
status = nfsd4_decode_nfstime4(argp, &lcp->lc_mtime);
if (status)
return status;
} else {
lcp->lc_mtime.tv_nsec = UTIME_NOW;
}
return nfsd4_decode_layoutupdate4(argp, lcp);
}
static __be32
nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_layoutget *lgp = &u->layoutget;
__be32 status;
memset(lgp, 0, sizeof(*lgp));
if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_signal) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_layout_type) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_seg.iomode) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.offset) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.length) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_minlength) < 0)
return nfserr_bad_xdr;
status = nfsd4_decode_stateid4(argp, &lgp->lg_sid);
if (status)
return status;
if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_maxcount) < 0)
return nfserr_bad_xdr;
return nfs_ok;
}
static __be32
nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
memset(lrp, 0, sizeof(*lrp));
if (xdr_stream_decode_bool(argp->xdr, &lrp->lr_reclaim) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_layout_type) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_seg.iomode) < 0)
return nfserr_bad_xdr;
return nfsd4_decode_layoutreturn4(argp, lrp);
}
#endif /* CONFIG_NFSD_PNFS */
static __be32 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_secinfo_no_name *sin = &u->secinfo_no_name;
if (xdr_stream_decode_u32(argp->xdr, &sin->sin_style) < 0)
return nfserr_bad_xdr;
sin->sin_exp = NULL;
return nfs_ok;
}
static __be32
nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_sequence *seq = &u->sequence;
__be32 *p, status;
status = nfsd4_decode_sessionid4(argp, &seq->sessionid);
if (status)
return status;
p = xdr_inline_decode(argp->xdr, XDR_UNIT * 4);
if (!p)
return nfserr_bad_xdr;
seq->seqid = be32_to_cpup(p++);
seq->slotid = be32_to_cpup(p++);
seq->maxslots = be32_to_cpup(p++);
seq->cachethis = be32_to_cpup(p);
seq->status_flags = 0;
return nfs_ok;
}
static __be32
nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
struct nfsd4_test_stateid_id *stateid;
__be32 status;
u32 i;
memset(test_stateid, 0, sizeof(*test_stateid));
if (xdr_stream_decode_u32(argp->xdr, &test_stateid->ts_num_ids) < 0)
return nfserr_bad_xdr;
INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
for (i = 0; i < test_stateid->ts_num_ids; i++) {
stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
if (!stateid)
return nfserr_jukebox;
INIT_LIST_HEAD(&stateid->ts_id_list);
list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
status = nfsd4_decode_stateid4(argp, &stateid->ts_id_stateid);
if (status)
return status;
}
return nfs_ok;
}
static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_destroy_clientid *dc = &u->destroy_clientid;
return nfsd4_decode_clientid4(argp, &dc->clientid);
}
static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_reclaim_complete *rc = &u->reclaim_complete;
if (xdr_stream_decode_bool(argp->xdr, &rc->rca_one_fs) < 0)
return nfserr_bad_xdr;
return nfs_ok;
}
static __be32
nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_fallocate *fallocate = &u->allocate;
__be32 status;
status = nfsd4_decode_stateid4(argp, &fallocate->falloc_stateid);
if (status)
return status;
if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_offset) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_length) < 0)
return nfserr_bad_xdr;
return nfs_ok;
}
static __be32 nfsd4_decode_nl4_server(struct nfsd4_compoundargs *argp,
struct nl4_server *ns)
{
struct nfs42_netaddr *naddr;
__be32 *p;
if (xdr_stream_decode_u32(argp->xdr, &ns->nl4_type) < 0)
return nfserr_bad_xdr;
/* currently support for 1 inter-server source server */
switch (ns->nl4_type) {
case NL4_NETADDR:
naddr = &ns->u.nl4_addr;
if (xdr_stream_decode_u32(argp->xdr, &naddr->netid_len) < 0)
return nfserr_bad_xdr;
if (naddr->netid_len > RPCBIND_MAXNETIDLEN)
return nfserr_bad_xdr;
p = xdr_inline_decode(argp->xdr, naddr->netid_len);
if (!p)
return nfserr_bad_xdr;
memcpy(naddr->netid, p, naddr->netid_len);
if (xdr_stream_decode_u32(argp->xdr, &naddr->addr_len) < 0)
return nfserr_bad_xdr;
if (naddr->addr_len > RPCBIND_MAXUADDRLEN)
return nfserr_bad_xdr;
p = xdr_inline_decode(argp->xdr, naddr->addr_len);
if (!p)
return nfserr_bad_xdr;
memcpy(naddr->addr, p, naddr->addr_len);
break;
default:
return nfserr_bad_xdr;
}
return nfs_ok;
}
static __be32
nfsd4_decode_copy(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
{
struct nfsd4_copy *copy = &u->copy;
u32 consecutive, i, count, sync;
struct nl4_server *ns_dummy;
__be32 status;
memset(copy, 0, sizeof(*copy));
status = nfsd4_decode_stateid4(argp, &copy->cp_src_stateid);
if (status)
return status;
status = nfsd4_decode_stateid4(argp, &copy->cp_dst_stateid);
if (status)
return status;
if (xdr_stream_decode_u64(argp->xdr, &copy->cp_src_pos) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u64(argp->xdr, &copy->cp_dst_pos) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u64(argp->xdr, &copy->cp_count) < 0)
return nfserr_bad_xdr;
/* ca_consecutive: we always do consecutive copies */
if (xdr_stream_decode_u32(argp->xdr, &consecutive) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_bool(argp->xdr, &sync) < 0)
return nfserr_bad_xdr;
nfsd4_copy_set_sync(copy, sync);
if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
return nfserr_bad_xdr;
copy->cp_src = svcxdr_tmpalloc(argp, sizeof(*copy->cp_src));
if (copy->cp_src == NULL)
return nfserr_jukebox;
if (count == 0) { /* intra-server copy */
__set_bit(NFSD4_COPY_F_INTRA, &copy->cp_flags);
return nfs_ok;
}
/* decode all the supplied server addresses but use only the first */
status = nfsd4_decode_nl4_server(argp, copy->cp_src);
if (status)
return status;
ns_dummy = kmalloc(sizeof(struct nl4_server), GFP_KERNEL);
if (ns_dummy == NULL)
return nfserr_jukebox;
for (i = 0; i < count - 1; i++) {
status = nfsd4_decode_nl4_server(argp, ns_dummy);
if (status) {
kfree(ns_dummy);
return status;
}
}
kfree(ns_dummy);
return nfs_ok;
}
static __be32
nfsd4_decode_copy_notify(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_copy_notify *cn = &u->copy_notify;
__be32 status;
memset(cn, 0, sizeof(*cn));
cn->cpn_src = svcxdr_tmpalloc(argp, sizeof(*cn->cpn_src));
if (cn->cpn_src == NULL)
return nfserr_jukebox;
cn->cpn_dst = svcxdr_tmpalloc(argp, sizeof(*cn->cpn_dst));
if (cn->cpn_dst == NULL)
return nfserr_jukebox;
status = nfsd4_decode_stateid4(argp, &cn->cpn_src_stateid);
if (status)
return status;
return nfsd4_decode_nl4_server(argp, cn->cpn_dst);
}
static __be32
nfsd4_decode_offload_status(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_offload_status *os = &u->offload_status;
os->count = 0;
os->status = 0;
return nfsd4_decode_stateid4(argp, &os->stateid);
}
static __be32
nfsd4_decode_seek(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
{
struct nfsd4_seek *seek = &u->seek;
__be32 status;
status = nfsd4_decode_stateid4(argp, &seek->seek_stateid);
if (status)
return status;
if (xdr_stream_decode_u64(argp->xdr, &seek->seek_offset) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &seek->seek_whence) < 0)
return nfserr_bad_xdr;
seek->seek_eof = 0;
seek->seek_pos = 0;
return nfs_ok;
}
static __be32
nfsd4_decode_clone(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
{
struct nfsd4_clone *clone = &u->clone;
__be32 status;
status = nfsd4_decode_stateid4(argp, &clone->cl_src_stateid);
if (status)
return status;
status = nfsd4_decode_stateid4(argp, &clone->cl_dst_stateid);
if (status)
return status;
if (xdr_stream_decode_u64(argp->xdr, &clone->cl_src_pos) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u64(argp->xdr, &clone->cl_dst_pos) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u64(argp->xdr, &clone->cl_count) < 0)
return nfserr_bad_xdr;
return nfs_ok;
}
/*
* XDR data that is more than PAGE_SIZE in size is normally part of a
* read or write. However, the size of extended attributes is limited
* by the maximum request size, and then further limited by the underlying
* filesystem limits. This can exceed PAGE_SIZE (currently, XATTR_SIZE_MAX
* is 64k). Since there is no kvec- or page-based interface to xattrs,
* and we're not dealing with contiguous pages, we need to do some copying.
*/
/*
* Decode data into buffer.
*/
static __be32
nfsd4_vbuf_from_vector(struct nfsd4_compoundargs *argp, struct xdr_buf *xdr,
char **bufp, u32 buflen)
{
struct page **pages = xdr->pages;
struct kvec *head = xdr->head;
char *tmp, *dp;
u32 len;
if (buflen <= head->iov_len) {
/*
* We're in luck, the head has enough space. Just return
* the head, no need for copying.
*/
*bufp = head->iov_base;
return 0;
}
tmp = svcxdr_tmpalloc(argp, buflen);
if (tmp == NULL)
return nfserr_jukebox;
dp = tmp;
memcpy(dp, head->iov_base, head->iov_len);
buflen -= head->iov_len;
dp += head->iov_len;
while (buflen > 0) {
len = min_t(u32, buflen, PAGE_SIZE);
memcpy(dp, page_address(*pages), len);
buflen -= len;
dp += len;
pages++;
}
*bufp = tmp;
return 0;
}
/*
* Get a user extended attribute name from the XDR buffer.
* It will not have the "user." prefix, so prepend it.
* Lastly, check for nul characters in the name.
*/
static __be32
nfsd4_decode_xattr_name(struct nfsd4_compoundargs *argp, char **namep)
{
char *name, *sp, *dp;
u32 namelen, cnt;
__be32 *p;
if (xdr_stream_decode_u32(argp->xdr, &namelen) < 0)
return nfserr_bad_xdr;
if (namelen > (XATTR_NAME_MAX - XATTR_USER_PREFIX_LEN))
return nfserr_nametoolong;
if (namelen == 0)
return nfserr_bad_xdr;
p = xdr_inline_decode(argp->xdr, namelen);
if (!p)
return nfserr_bad_xdr;
name = svcxdr_tmpalloc(argp, namelen + XATTR_USER_PREFIX_LEN + 1);
if (!name)
return nfserr_jukebox;
memcpy(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
/*
* Copy the extended attribute name over while checking for 0
* characters.
*/
sp = (char *)p;
dp = name + XATTR_USER_PREFIX_LEN;