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android-kvm / linux / ee94699a1a0fe44251061b655ae6247a4700a8bb / . / fs / nfsd / nfs4xdr.c
blob: 92c7dde148a4d81f3e29a4efbd480c9cffa03e3a [file] [log] [blame]
/*
* 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;
cnt = namelen;
while (cnt-- > 0) {
if (*sp == '\0')
return nfserr_bad_xdr;
*dp++ = *sp++;
}
*dp = '\0';
*namep = name;
return nfs_ok;
}
/*
* A GETXATTR op request comes without a length specifier. We just set the
* maximum length for the reply based on XATTR_SIZE_MAX and the maximum
* channel reply size. nfsd_getxattr will probe the length of the xattr,
* check it against getxa_len, and allocate + return the value.
*/
static __be32
nfsd4_decode_getxattr(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_getxattr *getxattr = &u->getxattr;
__be32 status;
u32 maxcount;
memset(getxattr, 0, sizeof(*getxattr));
status = nfsd4_decode_xattr_name(argp, &getxattr->getxa_name);
if (status)
return status;
maxcount = svc_max_payload(argp->rqstp);
maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount);
getxattr->getxa_len = maxcount;
return nfs_ok;
}
static __be32
nfsd4_decode_setxattr(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_setxattr *setxattr = &u->setxattr;
u32 flags, maxcount, size;
__be32 status;
memset(setxattr, 0, sizeof(*setxattr));
if (xdr_stream_decode_u32(argp->xdr, &flags) < 0)
return nfserr_bad_xdr;
if (flags > SETXATTR4_REPLACE)
return nfserr_inval;
setxattr->setxa_flags = flags;
status = nfsd4_decode_xattr_name(argp, &setxattr->setxa_name);
if (status)
return status;
maxcount = svc_max_payload(argp->rqstp);
maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount);
if (xdr_stream_decode_u32(argp->xdr, &size) < 0)
return nfserr_bad_xdr;
if (size > maxcount)
return nfserr_xattr2big;
setxattr->setxa_len = size;
if (size > 0) {
struct xdr_buf payload;
if (!xdr_stream_subsegment(argp->xdr, &payload, size))
return nfserr_bad_xdr;
status = nfsd4_vbuf_from_vector(argp, &payload,
&setxattr->setxa_buf, size);
}
return nfs_ok;
}
static __be32
nfsd4_decode_listxattrs(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_listxattrs *listxattrs = &u->listxattrs;
u32 maxcount;
memset(listxattrs, 0, sizeof(*listxattrs));
if (xdr_stream_decode_u64(argp->xdr, &listxattrs->lsxa_cookie) < 0)
return nfserr_bad_xdr;
/*
* If the cookie is too large to have even one user.x attribute
* plus trailing '\0' left in a maximum size buffer, it's invalid.
*/
if (listxattrs->lsxa_cookie >=
(XATTR_LIST_MAX / (XATTR_USER_PREFIX_LEN + 2)))
return nfserr_badcookie;
if (xdr_stream_decode_u32(argp->xdr, &maxcount) < 0)
return nfserr_bad_xdr;
if (maxcount < 8)
/* Always need at least 2 words (length and one character) */
return nfserr_inval;
maxcount = min(maxcount, svc_max_payload(argp->rqstp));
listxattrs->lsxa_maxcount = maxcount;
return nfs_ok;
}
static __be32
nfsd4_decode_removexattr(struct nfsd4_compoundargs *argp,
union nfsd4_op_u *u)
{
struct nfsd4_removexattr *removexattr = &u->removexattr;
memset(removexattr, 0, sizeof(*removexattr));
return nfsd4_decode_xattr_name(argp, &removexattr->rmxa_name);
}
static __be32
nfsd4_decode_noop(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p)
{
return nfs_ok;
}
static __be32
nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p)
{
return nfserr_notsupp;
}
typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u);
static const nfsd4_dec nfsd4_dec_ops[] = {
[OP_ACCESS] = nfsd4_decode_access,
[OP_CLOSE] = nfsd4_decode_close,
[OP_COMMIT] = nfsd4_decode_commit,
[OP_CREATE] = nfsd4_decode_create,
[OP_DELEGPURGE] = nfsd4_decode_notsupp,
[OP_DELEGRETURN] = nfsd4_decode_delegreturn,
[OP_GETATTR] = nfsd4_decode_getattr,
[OP_GETFH] = nfsd4_decode_noop,
[OP_LINK] = nfsd4_decode_link,
[OP_LOCK] = nfsd4_decode_lock,
[OP_LOCKT] = nfsd4_decode_lockt,
[OP_LOCKU] = nfsd4_decode_locku,
[OP_LOOKUP] = nfsd4_decode_lookup,
[OP_LOOKUPP] = nfsd4_decode_noop,
[OP_NVERIFY] = nfsd4_decode_verify,
[OP_OPEN] = nfsd4_decode_open,
[OP_OPENATTR] = nfsd4_decode_notsupp,
[OP_OPEN_CONFIRM] = nfsd4_decode_open_confirm,
[OP_OPEN_DOWNGRADE] = nfsd4_decode_open_downgrade,
[OP_PUTFH] = nfsd4_decode_putfh,
[OP_PUTPUBFH] = nfsd4_decode_putpubfh,
[OP_PUTROOTFH] = nfsd4_decode_noop,
[OP_READ] = nfsd4_decode_read,
[OP_READDIR] = nfsd4_decode_readdir,
[OP_READLINK] = nfsd4_decode_noop,
[OP_REMOVE] = nfsd4_decode_remove,
[OP_RENAME] = nfsd4_decode_rename,
[OP_RENEW] = nfsd4_decode_renew,
[OP_RESTOREFH] = nfsd4_decode_noop,
[OP_SAVEFH] = nfsd4_decode_noop,
[OP_SECINFO] = nfsd4_decode_secinfo,
[OP_SETATTR] = nfsd4_decode_setattr,
[OP_SETCLIENTID] = nfsd4_decode_setclientid,
[OP_SETCLIENTID_CONFIRM] = nfsd4_decode_setclientid_confirm,
[OP_VERIFY] = nfsd4_decode_verify,
[OP_WRITE] = nfsd4_decode_write,
[OP_RELEASE_LOCKOWNER] = nfsd4_decode_release_lockowner,
/* new operations for NFSv4.1 */
[OP_BACKCHANNEL_CTL] = nfsd4_decode_backchannel_ctl,
[OP_BIND_CONN_TO_SESSION] = nfsd4_decode_bind_conn_to_session,
[OP_EXCHANGE_ID] = nfsd4_decode_exchange_id,
[OP_CREATE_SESSION] = nfsd4_decode_create_session,
[OP_DESTROY_SESSION] = nfsd4_decode_destroy_session,
[OP_FREE_STATEID] = nfsd4_decode_free_stateid,
[OP_GET_DIR_DELEGATION] = nfsd4_decode_notsupp,
#ifdef CONFIG_NFSD_PNFS
[OP_GETDEVICEINFO] = nfsd4_decode_getdeviceinfo,
[OP_GETDEVICELIST] = nfsd4_decode_notsupp,
[OP_LAYOUTCOMMIT] = nfsd4_decode_layoutcommit,
[OP_LAYOUTGET] = nfsd4_decode_layoutget,
[OP_LAYOUTRETURN] = nfsd4_decode_layoutreturn,
#else
[OP_GETDEVICEINFO] = nfsd4_decode_notsupp,
[OP_GETDEVICELIST] = nfsd4_decode_notsupp,
[OP_LAYOUTCOMMIT] = nfsd4_decode_notsupp,
[OP_LAYOUTGET] = nfsd4_decode_notsupp,
[OP_LAYOUTRETURN] = nfsd4_decode_notsupp,
#endif
[OP_SECINFO_NO_NAME] = nfsd4_decode_secinfo_no_name,
[OP_SEQUENCE] = nfsd4_decode_sequence,
[OP_SET_SSV] = nfsd4_decode_notsupp,
[OP_TEST_STATEID] = nfsd4_decode_test_stateid,
[OP_WANT_DELEGATION] = nfsd4_decode_notsupp,
[OP_DESTROY_CLIENTID] = nfsd4_decode_destroy_clientid,
[OP_RECLAIM_COMPLETE] = nfsd4_decode_reclaim_complete,
/* new operations for NFSv4.2 */
[OP_ALLOCATE] = nfsd4_decode_fallocate,
[OP_COPY] = nfsd4_decode_copy,
[OP_COPY_NOTIFY] = nfsd4_decode_copy_notify,
[OP_DEALLOCATE] = nfsd4_decode_fallocate,
[OP_IO_ADVISE] = nfsd4_decode_notsupp,
[OP_LAYOUTERROR] = nfsd4_decode_notsupp,
[OP_LAYOUTSTATS] = nfsd4_decode_notsupp,
[OP_OFFLOAD_CANCEL] = nfsd4_decode_offload_status,
[OP_OFFLOAD_STATUS] = nfsd4_decode_offload_status,
[OP_READ_PLUS] = nfsd4_decode_read,
[OP_SEEK] = nfsd4_decode_seek,
[OP_WRITE_SAME] = nfsd4_decode_notsupp,
[OP_CLONE] = nfsd4_decode_clone,
/* RFC 8276 extended atributes operations */
[OP_GETXATTR] = nfsd4_decode_getxattr,
[OP_SETXATTR] = nfsd4_decode_setxattr,
[OP_LISTXATTRS] = nfsd4_decode_listxattrs,
[OP_REMOVEXATTR] = nfsd4_decode_removexattr,
};
static inline bool
nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
{
if (op->opnum < FIRST_NFS4_OP)
return false;
else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
return false;
else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
return false;
else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
return false;
return true;
}
static bool
nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
{
struct nfsd4_op *op;
bool cachethis = false;
int auth_slack= argp->rqstp->rq_auth_slack;
int max_reply = auth_slack + 8; /* opcnt, status */
int readcount = 0;
int readbytes = 0;
__be32 *p;
int i;
if (xdr_stream_decode_u32(argp->xdr, &argp->taglen) < 0)
return false;
max_reply += XDR_UNIT;
argp->tag = NULL;
if (unlikely(argp->taglen)) {
if (argp->taglen > NFSD4_MAX_TAGLEN)
return false;
p = xdr_inline_decode(argp->xdr, argp->taglen);
if (!p)
return false;
argp->tag = svcxdr_savemem(argp, p, argp->taglen);
if (!argp->tag)
return false;
max_reply += xdr_align_size(argp->taglen);
}
if (xdr_stream_decode_u32(argp->xdr, &argp->minorversion) < 0)
return false;
if (xdr_stream_decode_u32(argp->xdr, &argp->client_opcnt) < 0)
return false;
argp->opcnt = min_t(u32, argp->client_opcnt,
NFSD_MAX_OPS_PER_COMPOUND);
if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
argp->ops = vcalloc(argp->opcnt, sizeof(*argp->ops));
if (!argp->ops) {
argp->ops = argp->iops;
return false;
}
}
if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
argp->opcnt = 0;
for (i = 0; i < argp->opcnt; i++) {
op = &argp->ops[i];
op->replay = NULL;
op->opdesc = NULL;
if (xdr_stream_decode_u32(argp->xdr, &op->opnum) < 0)
return false;
if (nfsd4_opnum_in_range(argp, op)) {
op->opdesc = OPDESC(op);
op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
if (op->status != nfs_ok)
trace_nfsd_compound_decode_err(argp->rqstp,
argp->opcnt, i,
op->opnum,
op->status);
} else {
op->opnum = OP_ILLEGAL;
op->status = nfserr_op_illegal;
}
/*
* We'll try to cache the result in the DRC if any one
* op in the compound wants to be cached:
*/
cachethis |= nfsd4_cache_this_op(op);
if (op->opnum == OP_READ || op->opnum == OP_READ_PLUS) {
readcount++;
readbytes += nfsd4_max_reply(argp->rqstp, op);
} else
max_reply += nfsd4_max_reply(argp->rqstp, op);
/*
* OP_LOCK and OP_LOCKT may return a conflicting lock.
* (Special case because it will just skip encoding this
* if it runs out of xdr buffer space, and it is the only
* operation that behaves this way.)
*/
if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
max_reply += NFS4_OPAQUE_LIMIT;
if (op->status) {
argp->opcnt = i+1;
break;
}
}
/* Sessions make the DRC unnecessary: */
if (argp->minorversion)
cachethis = false;
svc_reserve(argp->rqstp, max_reply + readbytes);
argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
return true;
}
static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
struct svc_export *exp)
{
if (exp->ex_flags & NFSEXP_V4ROOT) {
*p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
*p++ = 0;
} else
p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode));
return p;
}
static __be32 nfsd4_encode_nfstime4(struct xdr_stream *xdr,
struct timespec64 *tv)
{
__be32 *p;
p = xdr_reserve_space(xdr, XDR_UNIT * 3);
if (!p)
return nfserr_resource;
p = xdr_encode_hyper(p, (s64)tv->tv_sec);
*p = cpu_to_be32(tv->tv_nsec);
return nfs_ok;
}
/*
* ctime (in NFSv4, time_metadata) is not writeable, and the client
* doesn't really care what resolution could theoretically be stored by
* the filesystem.
*
* The client cares how close together changes can be while still
* guaranteeing ctime changes. For most filesystems (which have
* timestamps with nanosecond fields) that is limited by the resolution
* of the time returned from current_time() (which I'm assuming to be
* 1/HZ).
*/
static __be32 *encode_time_delta(__be32 *p, struct inode *inode)
{
struct timespec64 ts;
u32 ns;
ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran);
ts = ns_to_timespec64(ns);
p = xdr_encode_hyper(p, ts.tv_sec);
*p++ = cpu_to_be32(ts.tv_nsec);
return p;
}
static __be32
nfsd4_encode_change_info4(struct xdr_stream *xdr, struct nfsd4_change_info *c)
{
if (xdr_stream_encode_bool(xdr, c->atomic) < 0)
return nfserr_resource;
if (xdr_stream_encode_u64(xdr, c->before_change) < 0)
return nfserr_resource;
if (xdr_stream_encode_u64(xdr, c->after_change) < 0)
return nfserr_resource;
return nfs_ok;
}
/* Encode as an array of strings the string given with components
* separated @sep, escaped with esc_enter and esc_exit.
*/
static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
char *components, char esc_enter,
char esc_exit)
{
__be32 *p;
__be32 pathlen;
int pathlen_offset;
int strlen, count=0;
char *str, *end, *next;
dprintk("nfsd4_encode_components(%s)\n", components);
pathlen_offset = xdr->buf->len;
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
p++; /* We will fill this in with @count later */
end = str = components;
while (*end) {
bool found_esc = false;
/* try to parse as esc_start, ..., esc_end, sep */
if (*str == esc_enter) {
for (; *end && (*end != esc_exit); end++)
/* find esc_exit or end of string */;
next = end + 1;
if (*end && (!*next || *next == sep)) {
str++;
found_esc = true;
}
}
if (!found_esc)
for (; *end && (*end != sep); end++)
/* find sep or end of string */;
strlen = end - str;
if (strlen) {
p = xdr_reserve_space(xdr, strlen + 4);
if (!p)
return nfserr_resource;
p = xdr_encode_opaque(p, str, strlen);
count++;
}
else
end++;
if (found_esc)
end = next;
str = end;
}
pathlen = htonl(count);
write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
return 0;
}
/* Encode as an array of strings the string given with components
* separated @sep.
*/
static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
char *components)
{
return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
}
/*
* encode a location element of a fs_locations structure
*/
static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
struct nfsd4_fs_location *location)
{
__be32 status;
status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
'[', ']');
if (status)
return status;
status = nfsd4_encode_components(xdr, '/', location->path);
if (status)
return status;
return 0;
}
/*
* Encode a path in RFC3530 'pathname4' format
*/
static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
const struct path *root,
const struct path *path)
{
struct path cur = *path;
__be32 *p;
struct dentry **components = NULL;
unsigned int ncomponents = 0;
__be32 err = nfserr_jukebox;
dprintk("nfsd4_encode_components(");
path_get(&cur);
/* First walk the path up to the nfsd root, and store the
* dentries/path components in an array.
*/
for (;;) {
if (path_equal(&cur, root))
break;
if (cur.dentry == cur.mnt->mnt_root) {
if (follow_up(&cur))
continue;
goto out_free;
}
if ((ncomponents & 15) == 0) {
struct dentry **new;
new = krealloc(components,
sizeof(*new) * (ncomponents + 16),
GFP_KERNEL);
if (!new)
goto out_free;
components = new;
}
components[ncomponents++] = cur.dentry;
cur.dentry = dget_parent(cur.dentry);
}
err = nfserr_resource;
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_free;
*p++ = cpu_to_be32(ncomponents);
while (ncomponents) {
struct dentry *dentry = components[ncomponents - 1];
unsigned int len;
spin_lock(&dentry->d_lock);
len = dentry->d_name.len;
p = xdr_reserve_space(xdr, len + 4);
if (!p) {
spin_unlock(&dentry->d_lock);
goto out_free;
}
p = xdr_encode_opaque(p, dentry->d_name.name, len);
dprintk("/%pd", dentry);
spin_unlock(&dentry->d_lock);
dput(dentry);
ncomponents--;
}
err = 0;
out_free:
dprintk(")\n");
while (ncomponents)
dput(components[--ncomponents]);
kfree(components);
path_put(&cur);
return err;
}
static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
struct svc_rqst *rqstp, const struct path *path)
{
struct svc_export *exp_ps;
__be32 res;
exp_ps = rqst_find_fsidzero_export(rqstp);
if (IS_ERR(exp_ps))
return nfserrno(PTR_ERR(exp_ps));
res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
exp_put(exp_ps);
return res;
}
/*
* encode a fs_locations structure
*/
static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
struct svc_rqst *rqstp, struct svc_export *exp)
{
__be32 status;
int i;
__be32 *p;
struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
if (status)
return status;
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(fslocs->locations_count);
for (i=0; i<fslocs->locations_count; i++) {
status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
if (status)
return status;
}
return 0;
}
static u32 nfs4_file_type(umode_t mode)
{
switch (mode & S_IFMT) {
case S_IFIFO: return NF4FIFO;
case S_IFCHR: return NF4CHR;
case S_IFDIR: return NF4DIR;
case S_IFBLK: return NF4BLK;
case S_IFLNK: return NF4LNK;
case S_IFREG: return NF4REG;
case S_IFSOCK: return NF4SOCK;
default: return NF4BAD;
}
}
static inline __be32
nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
struct nfs4_ace *ace)
{
if (ace->whotype != NFS4_ACL_WHO_NAMED)
return nfs4_acl_write_who(xdr, ace->whotype);
else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
else
return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
}
static inline __be32
nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
{
__be32 *p;
unsigned long i = hweight_long(layout_types);
p = xdr_reserve_space(xdr, 4 + 4 * i);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(i);
for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
if (layout_types & (1 << i))
*p++ = cpu_to_be32(i);
return 0;
}
#define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
FATTR4_WORD0_RDATTR_ERROR)
#define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
#define WORD2_ABSENT_FS_ATTRS 0
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
static inline __be32
nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
void *context, int len)
{
__be32 *p;
p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
if (!p)
return nfserr_resource;
/*
* For now we use a 0 here to indicate the null translation; in
* the future we may place a call to translation code here.
*/
*p++ = cpu_to_be32(0); /* lfs */
*p++ = cpu_to_be32(0); /* pi */
p = xdr_encode_opaque(p, context, len);
return 0;
}
#else
static inline __be32
nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
void *context, int len)
{ return 0; }
#endif
static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
{
/* As per referral draft: */
if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
*bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
*bmval0 & FATTR4_WORD0_FS_LOCATIONS)
*rdattr_err = NFSERR_MOVED;
else
return nfserr_moved;
}
*bmval0 &= WORD0_ABSENT_FS_ATTRS;
*bmval1 &= WORD1_ABSENT_FS_ATTRS;
*bmval2 &= WORD2_ABSENT_FS_ATTRS;
return 0;
}
static int nfsd4_get_mounted_on_ino(struct svc_export *exp, u64 *pino)
{
struct path path = exp->ex_path;
struct kstat stat;
int err;
path_get(&path);
while (follow_up(&path)) {
if (path.dentry != path.mnt->mnt_root)
break;
}
err = vfs_getattr(&path, &stat, STATX_INO, AT_STATX_SYNC_AS_STAT);
path_put(&path);
if (!err)
*pino = stat.ino;
return err;
}
static __be32
nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
{
__be32 *p;
if (bmval2) {
p = xdr_reserve_space(xdr, 16);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(3);
*p++ = cpu_to_be32(bmval0);
*p++ = cpu_to_be32(bmval1);
*p++ = cpu_to_be32(bmval2);
} else if (bmval1) {
p = xdr_reserve_space(xdr, 12);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(2);
*p++ = cpu_to_be32(bmval0);
*p++ = cpu_to_be32(bmval1);
} else {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(1);
*p++ = cpu_to_be32(bmval0);
}
return 0;
out_resource:
return nfserr_resource;
}
/*
* Note: @fhp can be NULL; in this case, we might have to compose the filehandle
* ourselves.
*/
static __be32
nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
struct svc_export *exp,
struct dentry *dentry, u32 *bmval,
struct svc_rqst *rqstp, int ignore_crossmnt)
{
u32 bmval0 = bmval[0];
u32 bmval1 = bmval[1];
u32 bmval2 = bmval[2];
struct kstat stat;
struct svc_fh *tempfh = NULL;
struct kstatfs statfs;
__be32 *p, *attrlen_p;
int starting_len = xdr->buf->len;
int attrlen_offset;
u32 dummy;
u64 dummy64;
u32 rdattr_err = 0;
__be32 status;
int err;
struct nfs4_acl *acl = NULL;
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
void *context = NULL;
int contextlen;
#endif
bool contextsupport = false;
struct nfsd4_compoundres *resp = rqstp->rq_resp;
u32 minorversion = resp->cstate.minorversion;
struct path path = {
.mnt = exp->ex_path.mnt,
.dentry = dentry,
};
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
if (exp->ex_fslocs.migrated) {
status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
if (status)
goto out;
}
if (bmval0 & (FATTR4_WORD0_CHANGE | FATTR4_WORD0_SIZE)) {
status = nfsd4_deleg_getattr_conflict(rqstp, d_inode(dentry));
if (status)
goto out;
}
err = vfs_getattr(&path, &stat,
STATX_BASIC_STATS | STATX_BTIME | STATX_CHANGE_COOKIE,
AT_STATX_SYNC_AS_STAT);
if (err)
goto out_nfserr;
if (!(stat.result_mask & STATX_BTIME))
/* underlying FS does not offer btime so we can't share it */
bmval1 &= ~FATTR4_WORD1_TIME_CREATE;
if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
(bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
FATTR4_WORD1_SPACE_TOTAL))) {
err = vfs_statfs(&path, &statfs);
if (err)
goto out_nfserr;
}
if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
status = nfserr_jukebox;
if (!tempfh)
goto out;
fh_init(tempfh, NFS4_FHSIZE);
status = fh_compose(tempfh, exp, dentry, NULL);
if (status)
goto out;
fhp = tempfh;
}
if (bmval0 & FATTR4_WORD0_ACL) {
err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
if (err == -EOPNOTSUPP)
bmval0 &= ~FATTR4_WORD0_ACL;
else if (err == -EINVAL) {
status = nfserr_attrnotsupp;
goto out;
} else if (err != 0)
goto out_nfserr;
}
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
err = security_inode_getsecctx(d_inode(dentry),
&context, &contextlen);
else
err = -EOPNOTSUPP;
contextsupport = (err == 0);
if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
if (err == -EOPNOTSUPP)
bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
else if (err)
goto out_nfserr;
}
}
#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
if (status)
goto out;
attrlen_offset = xdr->buf->len;
attrlen_p = xdr_reserve_space(xdr, XDR_UNIT);
if (!attrlen_p)
goto out_resource;
if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
u32 supp[3];
memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
if (!IS_POSIXACL(dentry->d_inode))
supp[0] &= ~FATTR4_WORD0_ACL;
if (!contextsupport)
supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
if (!supp[2]) {
p = xdr_reserve_space(xdr, 12);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(2);
*p++ = cpu_to_be32(supp[0]);
*p++ = cpu_to_be32(supp[1]);
} else {
p = xdr_reserve_space(xdr, 16);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(3);
*p++ = cpu_to_be32(supp[0]);
*p++ = cpu_to_be32(supp[1]);
*p++ = cpu_to_be32(supp[2]);
}
}
if (bmval0 & FATTR4_WORD0_TYPE) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
dummy = nfs4_file_type(stat.mode);
if (dummy == NF4BAD) {
status = nfserr_serverfault;
goto out;
}
*p++ = cpu_to_be32(dummy);
}
if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
*p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
else
*p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
NFS4_FH_VOL_RENAME);
}
if (bmval0 & FATTR4_WORD0_CHANGE) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
p = encode_change(p, &stat, d_inode(dentry), exp);
}
if (bmval0 & FATTR4_WORD0_SIZE) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
p = xdr_encode_hyper(p, stat.size);
}
if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(1);
}
if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(1);
}
if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(0);
}
if (bmval0 & FATTR4_WORD0_FSID) {
p = xdr_reserve_space(xdr, 16);
if (!p)
goto out_resource;
if (exp->ex_fslocs.migrated) {
p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
} else switch(fsid_source(fhp)) {
case FSIDSOURCE_FSID:
p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
p = xdr_encode_hyper(p, (u64)0);
break;
case FSIDSOURCE_DEV:
*p++ = cpu_to_be32(0);
*p++ = cpu_to_be32(MAJOR(stat.dev));
*p++ = cpu_to_be32(0);
*p++ = cpu_to_be32(MINOR(stat.dev));
break;
case FSIDSOURCE_UUID:
p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
EX_UUID_LEN);
break;
}
}
if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(0);
}
if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(nn->nfsd4_lease);
}
if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(rdattr_err);
}
if (bmval0 & FATTR4_WORD0_ACL) {
struct nfs4_ace *ace;
if (acl == NULL) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(0);
goto out_acl;
}
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(acl->naces);
for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
p = xdr_reserve_space(xdr, 4*3);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(ace->type);
*p++ = cpu_to_be32(ace->flag);
*p++ = cpu_to_be32(ace->access_mask &
NFS4_ACE_MASK_ALL);
status = nfsd4_encode_aclname(xdr, rqstp, ace);
if (status)
goto out;
}
}
out_acl:
if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
}
if (bmval0 & FATTR4_WORD0_CANSETTIME) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(1);
}
if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(0);
}
if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(1);
}
if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(1);
}
if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
if (!p)
goto out_resource;
p = xdr_encode_opaque(p, &fhp->fh_handle.fh_raw,
fhp->fh_handle.fh_size);
}
if (bmval0 & FATTR4_WORD0_FILEID) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
p = xdr_encode_hyper(p, stat.ino);
}
if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
}
if (bmval0 & FATTR4_WORD0_FILES_FREE) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
}
if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
p = xdr_encode_hyper(p, (u64) statfs.f_files);
}
if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
if (status)
goto out;
}
if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(1);
}
if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
}
if (bmval0 & FATTR4_WORD0_MAXLINK) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(255);
}
if (bmval0 & FATTR4_WORD0_MAXNAME) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(statfs.f_namelen);
}
if (bmval0 & FATTR4_WORD0_MAXREAD) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
}
if (bmval0 & FATTR4_WORD0_MAXWRITE) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
}
if (bmval1 & FATTR4_WORD1_MODE) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(stat.mode & S_IALLUGO);
}
if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(1);
}
if (bmval1 & FATTR4_WORD1_NUMLINKS) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(stat.nlink);
}
if (bmval1 & FATTR4_WORD1_OWNER) {
status = nfsd4_encode_user(xdr, rqstp, stat.uid);
if (status)
goto out;
}
if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
status = nfsd4_encode_group(xdr, rqstp, stat.gid);
if (status)
goto out;
}
if (bmval1 & FATTR4_WORD1_RAWDEV) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
*p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
*p++ = cpu_to_be32((u32) MINOR(stat.rdev));
}
if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
p = xdr_encode_hyper(p, dummy64);
}
if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
p = xdr_encode_hyper(p, dummy64);
}
if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
p = xdr_encode_hyper(p, dummy64);
}
if (bmval1 & FATTR4_WORD1_SPACE_USED) {
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
dummy64 = (u64)stat.blocks << 9;
p = xdr_encode_hyper(p, dummy64);
}
if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
status = nfsd4_encode_nfstime4(xdr, &stat.atime);
if (status)
goto out;
}
if (bmval1 & FATTR4_WORD1_TIME_CREATE) {
status = nfsd4_encode_nfstime4(xdr, &stat.btime);
if (status)
goto out;
}
if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
p = xdr_reserve_space(xdr, 12);
if (!p)
goto out_resource;
p = encode_time_delta(p, d_inode(dentry));
}
if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
status = nfsd4_encode_nfstime4(xdr, &stat.ctime);
if (status)
goto out;
}
if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
status = nfsd4_encode_nfstime4(xdr, &stat.mtime);
if (status)
goto out;
}
if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
u64 ino = stat.ino;
p = xdr_reserve_space(xdr, 8);
if (!p)
goto out_resource;
/*
* Get ino of mountpoint in parent filesystem, if not ignoring
* crossmount and this is the root of a cross-mounted
* filesystem.
*/
if (ignore_crossmnt == 0 &&
dentry == exp->ex_path.mnt->mnt_root) {
err = nfsd4_get_mounted_on_ino(exp, &ino);
if (err)
goto out_nfserr;
}
p = xdr_encode_hyper(p, ino);
}
#ifdef CONFIG_NFSD_PNFS
if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
if (status)
goto out;
}
if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
if (status)
goto out;
}
if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
*p++ = cpu_to_be32(stat.blksize);
}
#endif /* CONFIG_NFSD_PNFS */
if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
u32 supp[3];
memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
if (status)
goto out;
}
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
status = nfsd4_encode_security_label(xdr, rqstp, context,
contextlen);
if (status)
goto out;
}
#endif
if (bmval2 & FATTR4_WORD2_XATTR_SUPPORT) {
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
err = xattr_supports_user_prefix(d_inode(dentry));
*p++ = cpu_to_be32(err == 0);
}
*attrlen_p = cpu_to_be32(xdr->buf->len - attrlen_offset - XDR_UNIT);
status = nfs_ok;
out:
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
if (context)
security_release_secctx(context, contextlen);
#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
kfree(acl);
if (tempfh) {
fh_put(tempfh);
kfree(tempfh);
}
if (status)
xdr_truncate_encode(xdr, starting_len);
return status;
out_nfserr:
status = nfserrno(err);
goto out;
out_resource:
status = nfserr_resource;
goto out;
}
static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
struct xdr_buf *buf, __be32 *p, int bytes)
{
xdr->scratch.iov_len = 0;
memset(buf, 0, sizeof(struct xdr_buf));
buf->head[0].iov_base = p;
buf->head[0].iov_len = 0;
buf->len = 0;
xdr->buf = buf;
xdr->iov = buf->head;
xdr->p = p;
xdr->end = (void *)p + bytes;
buf->buflen = bytes;
}
__be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
struct svc_fh *fhp, struct svc_export *exp,
struct dentry *dentry, u32 *bmval,
struct svc_rqst *rqstp, int ignore_crossmnt)
{
struct xdr_buf dummy;
struct xdr_stream xdr;
__be32 ret;
svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
ignore_crossmnt);
*p = xdr.p;
return ret;
}
static inline int attributes_need_mount(u32 *bmval)
{
if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
return 1;
if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
return 1;
return 0;
}
static __be32
nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
const char *name, int namlen)
{
struct svc_export *exp = cd->rd_fhp->fh_export;
struct dentry *dentry;
__be32 nfserr;
int ignore_crossmnt = 0;
dentry = lookup_positive_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
if (IS_ERR(dentry))
return nfserrno(PTR_ERR(dentry));
exp_get(exp);
/*
* In the case of a mountpoint, the client may be asking for
* attributes that are only properties of the underlying filesystem
* as opposed to the cross-mounted file system. In such a case,
* we will not follow the cross mount and will fill the attribtutes
* directly from the mountpoint dentry.
*/
if (nfsd_mountpoint(dentry, exp)) {
int err;
if (!(exp->ex_flags & NFSEXP_V4ROOT)
&& !attributes_need_mount(cd->rd_bmval)) {
ignore_crossmnt = 1;
goto out_encode;
}
/*
* Why the heck aren't we just using nfsd_lookup??
* Different "."/".." handling? Something else?
* At least, add a comment here to explain....
*/
err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
if (err) {
nfserr = nfserrno(err);
goto out_put;
}
nfserr = check_nfsd_access(exp, cd->rd_rqstp);
if (nfserr)
goto out_put;
}
out_encode:
nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
cd->rd_rqstp, ignore_crossmnt);
out_put:
dput(dentry);
exp_put(exp);
return nfserr;
}
static __be32 *
nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
{
__be32 *p;
p = xdr_reserve_space(xdr, 20);
if (!p)
return NULL;
*p++ = htonl(2);
*p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
*p++ = htonl(0); /* bmval1 */
*p++ = htonl(4); /* attribute length */
*p++ = nfserr; /* no htonl */
return p;
}
static int
nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
loff_t offset, u64 ino, unsigned int d_type)
{
struct readdir_cd *ccd = ccdv;
struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
struct xdr_stream *xdr = cd->xdr;
int start_offset = xdr->buf->len;
int cookie_offset;
u32 name_and_cookie;
int entry_bytes;
__be32 nfserr = nfserr_toosmall;
__be64 wire_offset;
__be32 *p;
/* In nfsv4, "." and ".." never make it onto the wire.. */
if (name && isdotent(name, namlen)) {
cd->common.err = nfs_ok;
return 0;
}
if (cd->cookie_offset) {
wire_offset = cpu_to_be64(offset);
write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
&wire_offset, 8);
}
p = xdr_reserve_space(xdr, 4);
if (!p)
goto fail;
*p++ = xdr_one; /* mark entry present */
cookie_offset = xdr->buf->len;
p = xdr_reserve_space(xdr, 3*4 + namlen);
if (!p)
goto fail;
p = xdr_encode_hyper(p, OFFSET_MAX); /* offset of next entry */
p = xdr_encode_array(p, name, namlen); /* name length & name */
nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
switch (nfserr) {
case nfs_ok:
break;
case nfserr_resource:
nfserr = nfserr_toosmall;
goto fail;
case nfserr_noent:
xdr_truncate_encode(xdr, start_offset);
goto skip_entry;
case nfserr_jukebox:
/*
* The pseudoroot should only display dentries that lead to
* exports. If we get EJUKEBOX here, then we can't tell whether
* this entry should be included. Just fail the whole READDIR
* with NFS4ERR_DELAY in that case, and hope that the situation
* will resolve itself by the client's next attempt.
*/
if (cd->rd_fhp->fh_export->ex_flags & NFSEXP_V4ROOT)
goto fail;
fallthrough;
default:
/*
* If the client requested the RDATTR_ERROR attribute,
* we stuff the error code into this attribute
* and continue. If this attribute was not requested,
* then in accordance with the spec, we fail the
* entire READDIR operation(!)
*/
if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
goto fail;
p = nfsd4_encode_rdattr_error(xdr, nfserr);
if (p == NULL) {
nfserr = nfserr_toosmall;
goto fail;
}
}
nfserr = nfserr_toosmall;
entry_bytes = xdr->buf->len - start_offset;
if (entry_bytes > cd->rd_maxcount)
goto fail;
cd->rd_maxcount -= entry_bytes;
/*
* RFC 3530 14.2.24 describes rd_dircount as only a "hint", and
* notes that it could be zero. If it is zero, then the server
* should enforce only the rd_maxcount value.
*/
if (cd->rd_dircount) {
name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
goto fail;
cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
if (!cd->rd_dircount)
cd->rd_maxcount = 0;
}
cd->cookie_offset = cookie_offset;
skip_entry:
cd->common.err = nfs_ok;
return 0;
fail:
xdr_truncate_encode(xdr, start_offset);
cd->common.err = nfserr;
return -EINVAL;
}
static __be32
nfsd4_encode_verifier4(struct xdr_stream *xdr, const nfs4_verifier *verf)
{
__be32 *p;
p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
if (!p)
return nfserr_resource;
memcpy(p, verf->data, sizeof(verf->data));
return nfs_ok;
}
static __be32
nfsd4_encode_clientid4(struct xdr_stream *xdr, const clientid_t *clientid)
{
__be32 *p;
p = xdr_reserve_space(xdr, sizeof(__be64));
if (!p)
return nfserr_resource;
memcpy(p, clientid, sizeof(*clientid));
return nfs_ok;
}
static __be32
nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
{
__be32 *p;
p = xdr_reserve_space(xdr, sizeof(stateid_t));
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(sid->si_generation);
p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
sizeof(stateid_opaque_t));
return 0;
}
static __be32
nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_access *access = &u->access;
struct xdr_stream *xdr = resp->xdr;
__be32 *p;
p = xdr_reserve_space(xdr, 8);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(access->ac_supported);
*p++ = cpu_to_be32(access->ac_resp_access);
return 0;
}
static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
struct xdr_stream *xdr = resp->xdr;
__be32 *p;
p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
if (!p)
return nfserr_resource;
p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
NFS4_MAX_SESSIONID_LEN);
*p++ = cpu_to_be32(bcts->dir);
/* Upshifting from TCP to RDMA is not supported */
*p++ = cpu_to_be32(0);
return 0;
}
static __be32
nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_close *close = &u->close;
struct xdr_stream *xdr = resp->xdr;
return nfsd4_encode_stateid(xdr, &close->cl_stateid);
}
static __be32
nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_commit *commit = &u->commit;
return nfsd4_encode_verifier4(resp->xdr, &commit->co_verf);
}
static __be32
nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_create *create = &u->create;
struct xdr_stream *xdr = resp->xdr;
nfserr = nfsd4_encode_change_info4(xdr, &create->cr_cinfo);
if (nfserr)
return nfserr;
return nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
create->cr_bmval[1], create->cr_bmval[2]);
}
static __be32
nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_getattr *getattr = &u->getattr;
struct svc_fh *fhp = getattr->ga_fhp;
struct xdr_stream *xdr = resp->xdr;
return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
getattr->ga_bmval, resp->rqstp, 0);
}
static __be32
nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct svc_fh **fhpp = &u->getfh;
struct xdr_stream *xdr = resp->xdr;
struct svc_fh *fhp = *fhpp;
unsigned int len;
__be32 *p;
len = fhp->fh_handle.fh_size;
p = xdr_reserve_space(xdr, len + 4);
if (!p)
return nfserr_resource;
p = xdr_encode_opaque(p, &fhp->fh_handle.fh_raw, len);
return 0;
}
/*
* Including all fields other than the name, a LOCK4denied structure requires
* 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
*/
static __be32
nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
{
struct xdr_netobj *conf = &ld->ld_owner;
__be32 *p;
again:
p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
if (!p) {
/*
* Don't fail to return the result just because we can't
* return the conflicting open:
*/
if (conf->len) {
kfree(conf->data);
conf->len = 0;
conf->data = NULL;
goto again;
}
return nfserr_resource;
}
p = xdr_encode_hyper(p, ld->ld_start);
p = xdr_encode_hyper(p, ld->ld_length);
*p++ = cpu_to_be32(ld->ld_type);
if (conf->len) {
p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
p = xdr_encode_opaque(p, conf->data, conf->len);
kfree(conf->data);
} else { /* non - nfsv4 lock in conflict, no clientid nor owner */
p = xdr_encode_hyper(p, (u64)0); /* clientid */
*p++ = cpu_to_be32(0); /* length of owner name */
}
return nfserr_denied;
}
static __be32
nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_lock *lock = &u->lock;
struct xdr_stream *xdr = resp->xdr;
if (!nfserr)
nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
else if (nfserr == nfserr_denied)
nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
return nfserr;
}
static __be32
nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_lockt *lockt = &u->lockt;
struct xdr_stream *xdr = resp->xdr;
if (nfserr == nfserr_denied)
nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
return nfserr;
}
static __be32
nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_locku *locku = &u->locku;
struct xdr_stream *xdr = resp->xdr;
return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
}
static __be32
nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_link *link = &u->link;
struct xdr_stream *xdr = resp->xdr;
return nfsd4_encode_change_info4(xdr, &link->li_cinfo);
}
static __be32
nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_open *open = &u->open;
struct xdr_stream *xdr = resp->xdr;
__be32 *p;
nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
if (nfserr)
return nfserr;
nfserr = nfsd4_encode_change_info4(xdr, &open->op_cinfo);
if (nfserr)
return nfserr;
if (xdr_stream_encode_u32(xdr, open->op_rflags) < 0)
return nfserr_resource;
nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
open->op_bmval[2]);
if (nfserr)
return nfserr;
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(open->op_delegate_type);
switch (open->op_delegate_type) {
case NFS4_OPEN_DELEGATE_NONE:
break;
case NFS4_OPEN_DELEGATE_READ:
nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
if (nfserr)
return nfserr;
p = xdr_reserve_space(xdr, 20);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(open->op_recall);
/*
* TODO: ACE's in delegations
*/
*p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
*p++ = cpu_to_be32(0);
*p++ = cpu_to_be32(0);
*p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
break;
case NFS4_OPEN_DELEGATE_WRITE:
nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
if (nfserr)
return nfserr;
p = xdr_reserve_space(xdr, XDR_UNIT * 8);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(open->op_recall);
/*
* Always flush on close
*
* TODO: space_limit's in delegations
*/
*p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
*p++ = xdr_zero;
*p++ = xdr_zero;
/*
* TODO: ACE's in delegations
*/
*p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
*p++ = cpu_to_be32(0);
*p++ = cpu_to_be32(0);
*p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
break;
case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
switch (open->op_why_no_deleg) {
case WND4_CONTENTION:
case WND4_RESOURCE:
p = xdr_reserve_space(xdr, 8);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(open->op_why_no_deleg);
/* deleg signaling not supported yet: */
*p++ = cpu_to_be32(0);
break;
default:
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(open->op_why_no_deleg);
}
break;
default:
BUG();
}
/* XXX save filehandle here */
return 0;
}
static __be32
nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_open_confirm *oc = &u->open_confirm;
struct xdr_stream *xdr = resp->xdr;
return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
}
static __be32
nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_open_downgrade *od = &u->open_downgrade;
struct xdr_stream *xdr = resp->xdr;
return nfsd4_encode_stateid(xdr, &od->od_stateid);
}
/*
* The operation of this function assumes that this is the only
* READ operation in the COMPOUND. If there are multiple READs,
* we use nfsd4_encode_readv().
*/
static __be32 nfsd4_encode_splice_read(
struct nfsd4_compoundres *resp,
struct nfsd4_read *read,
struct file *file, unsigned long maxcount)
{
struct xdr_stream *xdr = resp->xdr;
struct xdr_buf *buf = xdr->buf;
int status, space_left;
__be32 nfserr;
/*
* Make sure there is room at the end of buf->head for
* svcxdr_encode_opaque_pages() to create a tail buffer
* to XDR-pad the payload.
*/
if (xdr->iov != xdr->buf->head || xdr->end - xdr->p < 1)
return nfserr_resource;
nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
file, read->rd_offset, &maxcount,
&read->rd_eof);
read->rd_length = maxcount;
if (nfserr)
goto out_err;
svcxdr_encode_opaque_pages(read->rd_rqstp, xdr, buf->pages,
buf->page_base, maxcount);
status = svc_encode_result_payload(read->rd_rqstp,
buf->head[0].iov_len, maxcount);
if (status) {
nfserr = nfserrno(status);
goto out_err;
}
/*
* Prepare to encode subsequent operations.
*
* xdr_truncate_encode() is not safe to use after a successful
* splice read has been done, so the following stream
* manipulations are open-coded.
*/
space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
buf->buflen - buf->len);
buf->buflen = buf->len + space_left;
xdr->end = (__be32 *)((void *)xdr->end + space_left);
return nfs_ok;
out_err:
/*
* nfsd_splice_actor may have already messed with the
* page length; reset it so as not to confuse
* xdr_truncate_encode in our caller.
*/
buf->page_len = 0;
return nfserr;
}
static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
struct nfsd4_read *read,
struct file *file, unsigned long maxcount)
{
struct xdr_stream *xdr = resp->xdr;
unsigned int base = xdr->buf->page_len & ~PAGE_MASK;
unsigned int starting_len = xdr->buf->len;
__be32 zero = xdr_zero;
__be32 nfserr;
if (xdr_reserve_space_vec(xdr, maxcount) < 0)
return nfserr_resource;
nfserr = nfsd_iter_read(resp->rqstp, read->rd_fhp, file,
read->rd_offset, &maxcount, base,
&read->rd_eof);
read->rd_length = maxcount;
if (nfserr)
return nfserr;
if (svc_encode_result_payload(resp->rqstp, starting_len, maxcount))
return nfserr_io;
xdr_truncate_encode(xdr, starting_len + xdr_align_size(maxcount));
write_bytes_to_xdr_buf(xdr->buf, starting_len + maxcount, &zero,
xdr_pad_size(maxcount));
return nfs_ok;
}
static __be32
nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_read *read = &u->read;
bool splice_ok = test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags);
unsigned long maxcount;
struct xdr_stream *xdr = resp->xdr;
struct file *file;
int starting_len = xdr->buf->len;
__be32 *p;
if (nfserr)
return nfserr;
file = read->rd_nf->nf_file;
p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
if (!p) {
WARN_ON_ONCE(splice_ok);
return nfserr_resource;
}
if (resp->xdr->buf->page_len && splice_ok) {
WARN_ON_ONCE(1);
return nfserr_serverfault;
}
xdr_commit_encode(xdr);
maxcount = min_t(unsigned long, read->rd_length,
(xdr->buf->buflen - xdr->buf->len));
if (file->f_op->splice_read && splice_ok)
nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
else
nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
if (nfserr) {
xdr_truncate_encode(xdr, starting_len);
return nfserr;
}
p = xdr_encode_bool(p, read->rd_eof);
*p = cpu_to_be32(read->rd_length);
return nfs_ok;
}
static __be32
nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_readlink *readlink = &u->readlink;
__be32 *p, *maxcount_p, zero = xdr_zero;
struct xdr_stream *xdr = resp->xdr;
int length_offset = xdr->buf->len;
int maxcount, status;
maxcount_p = xdr_reserve_space(xdr, XDR_UNIT);
if (!maxcount_p)
return nfserr_resource;
maxcount = PAGE_SIZE;
p = xdr_reserve_space(xdr, maxcount);
if (!p)
return nfserr_resource;
/*
* XXX: By default, vfs_readlink() will truncate symlinks if they
* would overflow the buffer. Is this kosher in NFSv4? If not, one
* easy fix is: if vfs_readlink() precisely fills the buffer, assume
* that truncation occurred, and return NFS4ERR_RESOURCE.
*/
nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
(char *)p, &maxcount);
if (nfserr == nfserr_isdir)
nfserr = nfserr_inval;
if (nfserr)
goto out_err;
status = svc_encode_result_payload(readlink->rl_rqstp, length_offset,
maxcount);
if (status) {
nfserr = nfserrno(status);
goto out_err;
}
*maxcount_p = cpu_to_be32(maxcount);
xdr_truncate_encode(xdr, length_offset + 4 + xdr_align_size(maxcount));
write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount, &zero,
xdr_pad_size(maxcount));
return nfs_ok;
out_err:
xdr_truncate_encode(xdr, length_offset);
return nfserr;
}
static __be32
nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_readdir *readdir = &u->readdir;
int maxcount;
int bytes_left;
loff_t offset;
__be64 wire_offset;
struct xdr_stream *xdr = resp->xdr;
int starting_len = xdr->buf->len;
__be32 *p;
nfserr = nfsd4_encode_verifier4(xdr, &readdir->rd_verf);
if (nfserr != nfs_ok)
return nfserr;
/*
* Number of bytes left for directory entries allowing for the
* final 8 bytes of the readdir and a following failed op:
*/
bytes_left = xdr->buf->buflen - xdr->buf->len
- COMPOUND_ERR_SLACK_SPACE - 8;
if (bytes_left < 0) {
nfserr = nfserr_resource;
goto err_no_verf;
}
maxcount = svc_max_payload(resp->rqstp);
maxcount = min_t(u32, readdir->rd_maxcount, maxcount);
/*
* Note the rfc defines rd_maxcount as the size of the
* READDIR4resok structure, which includes the verifier above
* and the 8 bytes encoded at the end of this function:
*/
if (maxcount < 16) {
nfserr = nfserr_toosmall;
goto err_no_verf;
}
maxcount = min_t(int, maxcount-16, bytes_left);
/* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
if (!readdir->rd_dircount)
readdir->rd_dircount = svc_max_payload(resp->rqstp);
readdir->xdr = xdr;
readdir->rd_maxcount = maxcount;
readdir->common.err = 0;
readdir->cookie_offset = 0;
offset = readdir->rd_cookie;
nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
&offset,
&readdir->common, nfsd4_encode_dirent);
if (nfserr == nfs_ok &&
readdir->common.err == nfserr_toosmall &&
xdr->buf->len == starting_len + 8) {
/* nothing encoded; which limit did we hit?: */
if (maxcount - 16 < bytes_left)
/* It was the fault of rd_maxcount: */
nfserr = nfserr_toosmall;
else
/* We ran out of buffer space: */
nfserr = nfserr_resource;
}
if (nfserr)
goto err_no_verf;
if (readdir->cookie_offset) {
wire_offset = cpu_to_be64(offset);
write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
&wire_offset, 8);
}
p = xdr_reserve_space(xdr, 8);
if (!p) {
WARN_ON_ONCE(1);
goto err_no_verf;
}
*p++ = 0; /* no more entries */
*p++ = htonl(readdir->common.err == nfserr_eof);
return 0;
err_no_verf:
xdr_truncate_encode(xdr, starting_len);
return nfserr;
}
static __be32
nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_remove *remove = &u->remove;
struct xdr_stream *xdr = resp->xdr;
return nfsd4_encode_change_info4(xdr, &remove->rm_cinfo);
}
static __be32
nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_rename *rename = &u->rename;
struct xdr_stream *xdr = resp->xdr;
nfserr = nfsd4_encode_change_info4(xdr, &rename->rn_sinfo);
if (nfserr)
return nfserr;
return nfsd4_encode_change_info4(xdr, &rename->rn_tinfo);
}
static __be32
nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
{
u32 i, nflavs, supported;
struct exp_flavor_info *flavs;
struct exp_flavor_info def_flavs[2];
__be32 *p, *flavorsp;
static bool report = true;
if (exp->ex_nflavors) {
flavs = exp->ex_flavors;
nflavs = exp->ex_nflavors;
} else { /* Handling of some defaults in absence of real secinfo: */
flavs = def_flavs;
if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
nflavs = 2;
flavs[0].pseudoflavor = RPC_AUTH_UNIX;
flavs[1].pseudoflavor = RPC_AUTH_NULL;
} else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
nflavs = 1;
flavs[0].pseudoflavor
= svcauth_gss_flavor(exp->ex_client);
} else {
nflavs = 1;
flavs[0].pseudoflavor
= exp->ex_client->flavour->flavour;
}
}
supported = 0;
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
flavorsp = p++; /* to be backfilled later */
for (i = 0; i < nflavs; i++) {
rpc_authflavor_t pf = flavs[i].pseudoflavor;
struct rpcsec_gss_info info;
if (rpcauth_get_gssinfo(pf, &info) == 0) {
supported++;
p = xdr_reserve_space(xdr, 4 + 4 +
XDR_LEN(info.oid.len) + 4 + 4);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(RPC_AUTH_GSS);
p = xdr_encode_opaque(p, info.oid.data, info.oid.len);
*p++ = cpu_to_be32(info.qop);
*p++ = cpu_to_be32(info.service);
} else if (pf < RPC_AUTH_MAXFLAVOR) {
supported++;
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(pf);
} else {
if (report)
pr_warn("NFS: SECINFO: security flavor %u "
"is not supported\n", pf);
}
}
if (nflavs != supported)
report = false;
*flavorsp = htonl(supported);
return 0;
}
static __be32
nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_secinfo *secinfo = &u->secinfo;
struct xdr_stream *xdr = resp->xdr;
return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
}
static __be32
nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_secinfo_no_name *secinfo = &u->secinfo_no_name;
struct xdr_stream *xdr = resp->xdr;
return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
}
/*
* The SETATTR encode routine is special -- it always encodes a bitmap,
* regardless of the error status.
*/
static __be32
nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_setattr *setattr = &u->setattr;
struct xdr_stream *xdr = resp->xdr;
__be32 *p;
p = xdr_reserve_space(xdr, 16);
if (!p)
return nfserr_resource;
if (nfserr) {
*p++ = cpu_to_be32(3);
*p++ = cpu_to_be32(0);
*p++ = cpu_to_be32(0);
*p++ = cpu_to_be32(0);
}
else {
*p++ = cpu_to_be32(3);
*p++ = cpu_to_be32(setattr->sa_bmval[0]);
*p++ = cpu_to_be32(setattr->sa_bmval[1]);
*p++ = cpu_to_be32(setattr->sa_bmval[2]);
}
return nfserr;
}
static __be32
nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_setclientid *scd = &u->setclientid;
struct xdr_stream *xdr = resp->xdr;
if (!nfserr) {
nfserr = nfsd4_encode_clientid4(xdr, &scd->se_clientid);
if (nfserr != nfs_ok)
goto out;
nfserr = nfsd4_encode_verifier4(xdr, &scd->se_confirm);
} else if (nfserr == nfserr_clid_inuse) {
/* empty network id */
if (xdr_stream_encode_u32(xdr, 0) < 0) {
nfserr = nfserr_resource;
goto out;
}
/* empty universal address */
if (xdr_stream_encode_u32(xdr, 0) < 0) {
nfserr = nfserr_resource;
goto out;
}
}
out:
return nfserr;
}
static __be32
nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_write *write = &u->write;
if (xdr_stream_encode_u32(resp->xdr, write->wr_bytes_written) < 0)
return nfserr_resource;
if (xdr_stream_encode_u32(resp->xdr, write->wr_how_written) < 0)
return nfserr_resource;
return nfsd4_encode_verifier4(resp->xdr, &write->wr_verifier);
}
static __be32
nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_exchange_id *exid = &u->exchange_id;
struct xdr_stream *xdr = resp->xdr;
__be32 *p;
char *major_id;
char *server_scope;
int major_id_sz;
int server_scope_sz;
uint64_t minor_id = 0;
struct nfsd_net *nn = net_generic(SVC_NET(resp->rqstp), nfsd_net_id);
major_id = nn->nfsd_name;
major_id_sz = strlen(nn->nfsd_name);
server_scope = nn->nfsd_name;
server_scope_sz = strlen(nn->nfsd_name);
if (nfsd4_encode_clientid4(xdr, &exid->clientid) != nfs_ok)
return nfserr_resource;
if (xdr_stream_encode_u32(xdr, exid->seqid) < 0)
return nfserr_resource;
if (xdr_stream_encode_u32(xdr, exid->flags) < 0)
return nfserr_resource;
if (xdr_stream_encode_u32(xdr, exid->spa_how) < 0)
return nfserr_resource;
switch (exid->spa_how) {
case SP4_NONE:
break;
case SP4_MACH_CRED:
/* spo_must_enforce bitmap: */
nfserr = nfsd4_encode_bitmap(xdr,
exid->spo_must_enforce[0],
exid->spo_must_enforce[1],
exid->spo_must_enforce[2]);
if (nfserr)
return nfserr;
/* spo_must_allow bitmap: */
nfserr = nfsd4_encode_bitmap(xdr,
exid->spo_must_allow[0],
exid->spo_must_allow[1],
exid->spo_must_allow[2]);
if (nfserr)
return nfserr;
break;
default:
WARN_ON_ONCE(1);
}
p = xdr_reserve_space(xdr,
8 /* so_minor_id */ +
4 /* so_major_id.len */ +
(XDR_QUADLEN(major_id_sz) * 4) +
4 /* eir_server_scope.len */ +
(XDR_QUADLEN(server_scope_sz) * 4) +
4 /* eir_server_impl_id.count (0) */);
if (!p)
return nfserr_resource;
/* The server_owner struct */
p = xdr_encode_hyper(p, minor_id); /* Minor id */
/* major id */
p = xdr_encode_opaque(p, major_id, major_id_sz);
/* Server scope */
p = xdr_encode_opaque(p, server_scope, server_scope_sz);
/* Implementation id */
*p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */
return 0;
}
static __be32
nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_create_session *sess = &u->create_session;
struct xdr_stream *xdr = resp->xdr;
__be32 *p;
p = xdr_reserve_space(xdr, 24);
if (!p)
return nfserr_resource;
p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
NFS4_MAX_SESSIONID_LEN);
*p++ = cpu_to_be32(sess->seqid);
*p++ = cpu_to_be32(sess->flags);
p = xdr_reserve_space(xdr, 28);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(0); /* headerpadsz */
*p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
*p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
*p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
*p++ = cpu_to_be32(sess->fore_channel.maxops);
*p++ = cpu_to_be32(sess->fore_channel.maxreqs);
*p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
if (sess->fore_channel.nr_rdma_attrs) {
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
}
p = xdr_reserve_space(xdr, 28);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(0); /* headerpadsz */
*p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
*p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
*p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
*p++ = cpu_to_be32(sess->back_channel.maxops);
*p++ = cpu_to_be32(sess->back_channel.maxreqs);
*p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
if (sess->back_channel.nr_rdma_attrs) {
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
}
return 0;
}
static __be32
nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_sequence *seq = &u->sequence;
struct xdr_stream *xdr = resp->xdr;
__be32 *p;
p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
if (!p)
return nfserr_resource;
p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
NFS4_MAX_SESSIONID_LEN);
*p++ = cpu_to_be32(seq->seqid);
*p++ = cpu_to_be32(seq->slotid);
/* Note slotid's are numbered from zero: */
*p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
*p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
*p++ = cpu_to_be32(seq->status_flags);
resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
return 0;
}
static __be32
nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
struct xdr_stream *xdr = resp->xdr;
struct nfsd4_test_stateid_id *stateid, *next;
__be32 *p;
p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
if (!p)
return nfserr_resource;
*p++ = htonl(test_stateid->ts_num_ids);
list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
*p++ = stateid->ts_id_status;
}
return 0;
}
#ifdef CONFIG_NFSD_PNFS
static __be32
nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_getdeviceinfo *gdev = &u->getdeviceinfo;
struct xdr_stream *xdr = resp->xdr;
const struct nfsd4_layout_ops *ops;
u32 starting_len = xdr->buf->len, needed_len;
__be32 *p;
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(gdev->gd_layout_type);
ops = nfsd4_layout_ops[gdev->gd_layout_type];
nfserr = ops->encode_getdeviceinfo(xdr, gdev);
if (nfserr) {
/*
* We don't bother to burden the layout drivers with
* enforcing gd_maxcount, just tell the client to
* come back with a bigger buffer if it's not enough.
*/
if (xdr->buf->len + 4 > gdev->gd_maxcount)
goto toosmall;
return nfserr;
}
if (gdev->gd_notify_types) {
p = xdr_reserve_space(xdr, 4 + 4);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(1); /* bitmap length */
*p++ = cpu_to_be32(gdev->gd_notify_types);
} else {
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
*p++ = 0;
}
return 0;
toosmall:
dprintk("%s: maxcount too small\n", __func__);
needed_len = xdr->buf->len + 4 /* notifications */;
xdr_truncate_encode(xdr, starting_len);
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(needed_len);
return nfserr_toosmall;
}
static __be32
nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_layoutget *lgp = &u->layoutget;
struct xdr_stream *xdr = resp->xdr;
const struct nfsd4_layout_ops *ops;
__be32 *p;
p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(1); /* we always set return-on-close */
*p++ = cpu_to_be32(lgp->lg_sid.si_generation);
p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
sizeof(stateid_opaque_t));
*p++ = cpu_to_be32(1); /* we always return a single layout */
p = xdr_encode_hyper(p, lgp->lg_seg.offset);
p = xdr_encode_hyper(p, lgp->lg_seg.length);
*p++ = cpu_to_be32(lgp->lg_seg.iomode);
*p++ = cpu_to_be32(lgp->lg_layout_type);
ops = nfsd4_layout_ops[lgp->lg_layout_type];
return ops->encode_layoutget(xdr, lgp);
}
static __be32
nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
struct xdr_stream *xdr = resp->xdr;
__be32 *p;
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(lcp->lc_size_chg);
if (lcp->lc_size_chg) {
p = xdr_reserve_space(xdr, 8);
if (!p)
return nfserr_resource;
p = xdr_encode_hyper(p, lcp->lc_newsize);
}
return 0;
}
static __be32
nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
struct xdr_stream *xdr = resp->xdr;
__be32 *p;
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(lrp->lrs_present);
if (lrp->lrs_present)
return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
return 0;
}
#endif /* CONFIG_NFSD_PNFS */
static __be32
nfsd42_encode_write_res(struct nfsd4_compoundres *resp,
struct nfsd42_write_res *write, bool sync)
{
__be32 *p;
p = xdr_reserve_space(resp->xdr, 4);
if (!p)
return nfserr_resource;
if (sync)
*p++ = cpu_to_be32(0);
else {
__be32 nfserr;
*p++ = cpu_to_be32(1);
nfserr = nfsd4_encode_stateid(resp->xdr, &write->cb_stateid);
if (nfserr)
return nfserr;
}
p = xdr_reserve_space(resp->xdr, 8 + 4 + NFS4_VERIFIER_SIZE);
if (!p)
return nfserr_resource;
p = xdr_encode_hyper(p, write->wr_bytes_written);
*p++ = cpu_to_be32(write->wr_stable_how);
p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
NFS4_VERIFIER_SIZE);
return nfs_ok;
}
static __be32
nfsd42_encode_nl4_server(struct nfsd4_compoundres *resp, struct nl4_server *ns)
{
struct xdr_stream *xdr = resp->xdr;
struct nfs42_netaddr *addr;
__be32 *p;
p = xdr_reserve_space(xdr, 4);
*p++ = cpu_to_be32(ns->nl4_type);
switch (ns->nl4_type) {
case NL4_NETADDR:
addr = &ns->u.nl4_addr;
/* netid_len, netid, uaddr_len, uaddr (port included
* in RPCBIND_MAXUADDRLEN)
*/
p = xdr_reserve_space(xdr,
4 /* netid len */ +
(XDR_QUADLEN(addr->netid_len) * 4) +
4 /* uaddr len */ +
(XDR_QUADLEN(addr->addr_len) * 4));
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(addr->netid_len);
p = xdr_encode_opaque_fixed(p, addr->netid,
addr->netid_len);
*p++ = cpu_to_be32(addr->addr_len);
p = xdr_encode_opaque_fixed(p, addr->addr,
addr->addr_len);
break;
default:
WARN_ON_ONCE(ns->nl4_type != NL4_NETADDR);
return nfserr_inval;
}
return 0;
}
static __be32
nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_copy *copy = &u->copy;
__be32 *p;
nfserr = nfsd42_encode_write_res(resp, &copy->cp_res,
nfsd4_copy_is_sync(copy));
if (nfserr)
return nfserr;
p = xdr_reserve_space(resp->xdr, 4 + 4);
*p++ = xdr_one; /* cr_consecutive */
*p = nfsd4_copy_is_sync(copy) ? xdr_one : xdr_zero;
return 0;
}
static __be32
nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_offload_status *os = &u->offload_status;
struct xdr_stream *xdr = resp->xdr;
__be32 *p;
p = xdr_reserve_space(xdr, 8 + 4);
if (!p)
return nfserr_resource;
p = xdr_encode_hyper(p, os->count);
*p++ = cpu_to_be32(0);
return nfserr;
}
static __be32
nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp,
struct nfsd4_read *read)
{
bool splice_ok = test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags);
struct file *file = read->rd_nf->nf_file;
struct xdr_stream *xdr = resp->xdr;
unsigned long maxcount;
__be32 nfserr, *p;
/* Content type, offset, byte count */
p = xdr_reserve_space(xdr, 4 + 8 + 4);
if (!p)
return nfserr_io;
if (resp->xdr->buf->page_len && splice_ok) {
WARN_ON_ONCE(splice_ok);
return nfserr_serverfault;
}
maxcount = min_t(unsigned long, read->rd_length,
(xdr->buf->buflen - xdr->buf->len));
if (file->f_op->splice_read && splice_ok)
nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
else
nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
if (nfserr)
return nfserr;
*p++ = cpu_to_be32(NFS4_CONTENT_DATA);
p = xdr_encode_hyper(p, read->rd_offset);
*p = cpu_to_be32(read->rd_length);
return nfs_ok;
}
static __be32
nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_read *read = &u->read;
struct file *file = read->rd_nf->nf_file;
struct xdr_stream *xdr = resp->xdr;
int starting_len = xdr->buf->len;
u32 segments = 0;
__be32 *p;
if (nfserr)
return nfserr;
/* eof flag, segment count */
p = xdr_reserve_space(xdr, 4 + 4);
if (!p)
return nfserr_io;
xdr_commit_encode(xdr);
read->rd_eof = read->rd_offset >= i_size_read(file_inode(file));
if (read->rd_eof)
goto out;
nfserr = nfsd4_encode_read_plus_data(resp, read);
if (nfserr) {
xdr_truncate_encode(xdr, starting_len);
return nfserr;
}
segments++;
out:
p = xdr_encode_bool(p, read->rd_eof);
*p = cpu_to_be32(segments);
return nfserr;
}
static __be32
nfsd4_encode_copy_notify(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_copy_notify *cn = &u->copy_notify;
struct xdr_stream *xdr = resp->xdr;
__be32 *p;
if (nfserr)
return nfserr;
/* 8 sec, 4 nsec */
p = xdr_reserve_space(xdr, 12);
if (!p)
return nfserr_resource;
/* cnr_lease_time */
p = xdr_encode_hyper(p, cn->cpn_sec);
*p++ = cpu_to_be32(cn->cpn_nsec);
/* cnr_stateid */
nfserr = nfsd4_encode_stateid(xdr, &cn->cpn_cnr_stateid);
if (nfserr)
return nfserr;
/* cnr_src.nl_nsvr */
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
*p++ = cpu_to_be32(1);
nfserr = nfsd42_encode_nl4_server(resp, cn->cpn_src);
return nfserr;
}
static __be32
nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_seek *seek = &u->seek;
__be32 *p;
p = xdr_reserve_space(resp->xdr, 4 + 8);
*p++ = cpu_to_be32(seek->seek_eof);
p = xdr_encode_hyper(p, seek->seek_pos);
return 0;
}
static __be32
nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *p)
{
return nfserr;
}
/*
* Encode kmalloc-ed buffer in to XDR stream.
*/
static __be32
nfsd4_vbuf_to_stream(struct xdr_stream *xdr, char *buf, u32 buflen)
{
u32 cplen;
__be32 *p;
cplen = min_t(unsigned long, buflen,
((void *)xdr->end - (void *)xdr->p));
p = xdr_reserve_space(xdr, cplen);
if (!p)
return nfserr_resource;
memcpy(p, buf, cplen);
buf += cplen;
buflen -= cplen;
while (buflen) {
cplen = min_t(u32, buflen, PAGE_SIZE);
p = xdr_reserve_space(xdr, cplen);
if (!p)
return nfserr_resource;
memcpy(p, buf, cplen);
if (cplen < PAGE_SIZE) {
/*
* We're done, with a length that wasn't page
* aligned, so possibly not word aligned. Pad
* any trailing bytes with 0.
*/
xdr_encode_opaque_fixed(p, NULL, cplen);
break;
}
buflen -= PAGE_SIZE;
buf += PAGE_SIZE;
}
return 0;
}
static __be32
nfsd4_encode_getxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_getxattr *getxattr = &u->getxattr;
struct xdr_stream *xdr = resp->xdr;
__be32 *p, err;
p = xdr_reserve_space(xdr, 4);
if (!p)
return nfserr_resource;
*p = cpu_to_be32(getxattr->getxa_len);
if (getxattr->getxa_len == 0)
return 0;
err = nfsd4_vbuf_to_stream(xdr, getxattr->getxa_buf,
getxattr->getxa_len);
kvfree(getxattr->getxa_buf);
return err;
}
static __be32
nfsd4_encode_setxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_setxattr *setxattr = &u->setxattr;
struct xdr_stream *xdr = resp->xdr;
return nfsd4_encode_change_info4(xdr, &setxattr->setxa_cinfo);
}
/*
* See if there are cookie values that can be rejected outright.
*/
static __be32
nfsd4_listxattr_validate_cookie(struct nfsd4_listxattrs *listxattrs,
u32 *offsetp)
{
u64 cookie = listxattrs->lsxa_cookie;
/*
* If the cookie is larger than the maximum number we can fit
* in either the buffer we just got back from vfs_listxattr, or,
* XDR-encoded, in the return buffer, it's invalid.
*/
if (cookie > (listxattrs->lsxa_len) / (XATTR_USER_PREFIX_LEN + 2))
return nfserr_badcookie;
if (cookie > (listxattrs->lsxa_maxcount /
(XDR_QUADLEN(XATTR_USER_PREFIX_LEN + 2) + 4)))
return nfserr_badcookie;
*offsetp = (u32)cookie;
return 0;
}
static __be32
nfsd4_encode_listxattrs(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_listxattrs *listxattrs = &u->listxattrs;
struct xdr_stream *xdr = resp->xdr;
u32 cookie_offset, count_offset, eof;
u32 left, xdrleft, slen, count;
u32 xdrlen, offset;
u64 cookie;
char *sp;
__be32 status, tmp;
__be32 *p;
u32 nuser;
eof = 1;
status = nfsd4_listxattr_validate_cookie(listxattrs, &offset);
if (status)
goto out;
/*
* Reserve space for the cookie and the name array count. Record
* the offsets to save them later.
*/
cookie_offset = xdr->buf->len;
count_offset = cookie_offset + 8;
p = xdr_reserve_space(xdr, 12);
if (!p) {
status = nfserr_resource;
goto out;
}
count = 0;
left = listxattrs->lsxa_len;
sp = listxattrs->lsxa_buf;
nuser = 0;
xdrleft = listxattrs->lsxa_maxcount;
while (left > 0 && xdrleft > 0) {
slen = strlen(sp);
/*
* Check if this is a "user." attribute, skip it if not.
*/
if (strncmp(sp, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
goto contloop;
slen -= XATTR_USER_PREFIX_LEN;
xdrlen = 4 + ((slen + 3) & ~3);
if (xdrlen > xdrleft) {
if (count == 0) {
/*
* Can't even fit the first attribute name.
*/
status = nfserr_toosmall;
goto out;
}
eof = 0;
goto wreof;
}
left -= XATTR_USER_PREFIX_LEN;
sp += XATTR_USER_PREFIX_LEN;
if (nuser++ < offset)
goto contloop;
p = xdr_reserve_space(xdr, xdrlen);
if (!p) {
status = nfserr_resource;
goto out;
}
xdr_encode_opaque(p, sp, slen);
xdrleft -= xdrlen;
count++;
contloop:
sp += slen + 1;
left -= slen + 1;
}
/*
* If there were user attributes to copy, but we didn't copy
* any, the offset was too large (e.g. the cookie was invalid).
*/
if (nuser > 0 && count == 0) {
status = nfserr_badcookie;
goto out;
}
wreof:
p = xdr_reserve_space(xdr, 4);
if (!p) {
status = nfserr_resource;
goto out;
}
*p = cpu_to_be32(eof);
cookie = offset + count;
write_bytes_to_xdr_buf(xdr->buf, cookie_offset, &cookie, 8);
tmp = cpu_to_be32(count);
write_bytes_to_xdr_buf(xdr->buf, count_offset, &tmp, 4);
out:
if (listxattrs->lsxa_len)
kvfree(listxattrs->lsxa_buf);
return status;
}
static __be32
nfsd4_encode_removexattr(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
{
struct nfsd4_removexattr *removexattr = &u->removexattr;
struct xdr_stream *xdr = resp->xdr;
return nfsd4_encode_change_info4(xdr, &removexattr->rmxa_cinfo);
}
typedef __be32(*nfsd4_enc)(struct nfsd4_compoundres *, __be32, union nfsd4_op_u *u);
/*
* Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
* since we don't need to filter out obsolete ops as this is
* done in the decoding phase.
*/
static const nfsd4_enc nfsd4_enc_ops[] = {
[OP_ACCESS] = nfsd4_encode_access,
[OP_CLOSE] = nfsd4_encode_close,
[OP_COMMIT] = nfsd4_encode_commit,
[OP_CREATE] = nfsd4_encode_create,
[OP_DELEGPURGE] = nfsd4_encode_noop,
[OP_DELEGRETURN] = nfsd4_encode_noop,
[OP_GETATTR] = nfsd4_encode_getattr,
[OP_GETFH] = nfsd4_encode_getfh,
[OP_LINK] = nfsd4_encode_link,
[OP_LOCK] = nfsd4_encode_lock,
[OP_LOCKT] = nfsd4_encode_lockt,
[OP_LOCKU] = nfsd4_encode_locku,
[OP_LOOKUP] = nfsd4_encode_noop,
[OP_LOOKUPP] = nfsd4_encode_noop,
[OP_NVERIFY] = nfsd4_encode_noop,
[OP_OPEN] = nfsd4_encode_open,
[OP_OPENATTR] = nfsd4_encode_noop,
[OP_OPEN_CONFIRM] = nfsd4_encode_open_confirm,
[OP_OPEN_DOWNGRADE] = nfsd4_encode_open_downgrade,
[OP_PUTFH] = nfsd4_encode_noop,
[OP_PUTPUBFH] = nfsd4_encode_noop,
[OP_PUTROOTFH] = nfsd4_encode_noop,
[OP_READ] = nfsd4_encode_read,
[OP_READDIR] = nfsd4_encode_readdir,
[OP_READLINK] = nfsd4_encode_readlink,
[OP_REMOVE] = nfsd4_encode_remove,
[OP_RENAME] = nfsd4_encode_rename,
[OP_RENEW] = nfsd4_encode_noop,
[OP_RESTOREFH] = nfsd4_encode_noop,
[OP_SAVEFH] = nfsd4_encode_noop,
[OP_SECINFO] = nfsd4_encode_secinfo,
[OP_SETATTR] = nfsd4_encode_setattr,
[OP_SETCLIENTID] = nfsd4_encode_setclientid,
[OP_SETCLIENTID_CONFIRM] = nfsd4_encode_noop,
[OP_VERIFY] = nfsd4_encode_noop,
[OP_WRITE] = nfsd4_encode_write,
[OP_RELEASE_LOCKOWNER] = nfsd4_encode_noop,
/* NFSv4.1 operations */
[OP_BACKCHANNEL_CTL] = nfsd4_encode_noop,
[OP_BIND_CONN_TO_SESSION] = nfsd4_encode_bind_conn_to_session,
[OP_EXCHANGE_ID] = nfsd4_encode_exchange_id,
[OP_CREATE_SESSION] = nfsd4_encode_create_session,
[OP_DESTROY_SESSION] = nfsd4_encode_noop,
[OP_FREE_STATEID] = nfsd4_encode_noop,
[OP_GET_DIR_DELEGATION] = nfsd4_encode_noop,
#ifdef CONFIG_NFSD_PNFS
[OP_GETDEVICEINFO] = nfsd4_encode_getdeviceinfo,
[OP_GETDEVICELIST] = nfsd4_encode_noop,
[OP_LAYOUTCOMMIT] = nfsd4_encode_layoutcommit,
[OP_LAYOUTGET] = nfsd4_encode_layoutget,
[OP_LAYOUTRETURN] = nfsd4_encode_layoutreturn,
#else
[OP_GETDEVICEINFO] = nfsd4_encode_noop,
[OP_GETDEVICELIST] = nfsd4_encode_noop,
[OP_LAYOUTCOMMIT] = nfsd4_encode_noop,
[OP_LAYOUTGET] = nfsd4_encode_noop,
[OP_LAYOUTRETURN] = nfsd4_encode_noop,
#endif
[OP_SECINFO_NO_NAME] = nfsd4_encode_secinfo_no_name,
[OP_SEQUENCE] = nfsd4_encode_sequence,
[OP_SET_SSV] = nfsd4_encode_noop,
[OP_TEST_STATEID] = nfsd4_encode_test_stateid,
[OP_WANT_DELEGATION] = nfsd4_encode_noop,
[OP_DESTROY_CLIENTID] = nfsd4_encode_noop,
[OP_RECLAIM_COMPLETE] = nfsd4_encode_noop,
/* NFSv4.2 operations */
[OP_ALLOCATE] = nfsd4_encode_noop,
[OP_COPY] = nfsd4_encode_copy,
[OP_COPY_NOTIFY] = nfsd4_encode_copy_notify,
[OP_DEALLOCATE] = nfsd4_encode_noop,
[OP_IO_ADVISE] = nfsd4_encode_noop,
[OP_LAYOUTERROR] = nfsd4_encode_noop,
[OP_LAYOUTSTATS] = nfsd4_encode_noop,
[OP_OFFLOAD_CANCEL] = nfsd4_encode_noop,
[OP_OFFLOAD_STATUS] = nfsd4_encode_offload_status,
[OP_READ_PLUS] = nfsd4_encode_read_plus,
[OP_SEEK] = nfsd4_encode_seek,
[OP_WRITE_SAME] = nfsd4_encode_noop,
[OP_CLONE] = nfsd4_encode_noop,
/* RFC 8276 extended atributes operations */
[OP_GETXATTR] = nfsd4_encode_getxattr,
[OP_SETXATTR] = nfsd4_encode_setxattr,
[OP_LISTXATTRS] = nfsd4_encode_listxattrs,
[OP_REMOVEXATTR] = nfsd4_encode_removexattr,
};
/*
* Calculate whether we still have space to encode repsize bytes.
* There are two considerations:
* - For NFS versions >=4.1, the size of the reply must stay within
* session limits
* - For all NFS versions, we must stay within limited preallocated
* buffer space.
*
* This is called before the operation is processed, so can only provide
* an upper estimate. For some nonidempotent operations (such as
* getattr), it's not necessarily a problem if that estimate is wrong,
* as we can fail it after processing without significant side effects.
*/
__be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
{
struct xdr_buf *buf = &resp->rqstp->rq_res;
struct nfsd4_slot *slot = resp->cstate.slot;
if (buf->len + respsize <= buf->buflen)
return nfs_ok;
if (!nfsd4_has_session(&resp->cstate))
return nfserr_resource;
if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
WARN_ON_ONCE(1);
return nfserr_rep_too_big_to_cache;
}
return nfserr_rep_too_big;
}
void
nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
{
struct xdr_stream *xdr = resp->xdr;
struct nfs4_stateowner *so = resp->cstate.replay_owner;
struct svc_rqst *rqstp = resp->rqstp;
const struct nfsd4_operation *opdesc = op->opdesc;
int post_err_offset;
nfsd4_enc encoder;
__be32 *p;
p = xdr_reserve_space(xdr, 8);
if (!p)
goto release;
*p++ = cpu_to_be32(op->opnum);
post_err_offset = xdr->buf->len;
if (op->opnum == OP_ILLEGAL)
goto status;
if (op->status && opdesc &&
!(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
goto status;
BUG_ON(op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
!nfsd4_enc_ops[op->opnum]);
encoder = nfsd4_enc_ops[op->opnum];
op->status = encoder(resp, op->status, &op->u);
if (op->status)
trace_nfsd_compound_encode_err(rqstp, op->opnum, op->status);
xdr_commit_encode(xdr);
/* nfsd4_check_resp_size guarantees enough room for error status */
if (!op->status) {
int space_needed = 0;
if (!nfsd4_last_compound_op(rqstp))
space_needed = COMPOUND_ERR_SLACK_SPACE;
op->status = nfsd4_check_resp_size(resp, space_needed);
}
if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
struct nfsd4_slot *slot = resp->cstate.slot;
if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
op->status = nfserr_rep_too_big_to_cache;
else
op->status = nfserr_rep_too_big;
}
if (op->status == nfserr_resource ||
op->status == nfserr_rep_too_big ||
op->status == nfserr_rep_too_big_to_cache) {
/*
* The operation may have already been encoded or
* partially encoded. No op returns anything additional
* in the case of one of these three errors, so we can
* just truncate back to after the status. But it's a
* bug if we had to do this on a non-idempotent op:
*/
warn_on_nonidempotent_op(op);
xdr_truncate_encode(xdr, post_err_offset);
}
if (so) {
int len = xdr->buf->len - post_err_offset;
so->so_replay.rp_status = op->status;
so->so_replay.rp_buflen = len;
read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
so->so_replay.rp_buf, len);
}
status:
*p = op->status;
release:
if (opdesc && opdesc->op_release)
opdesc->op_release(&op->u);
/*
* Account for pages consumed while encoding this operation.
* The xdr_stream primitives don't manage rq_next_page.
*/
rqstp->rq_next_page = xdr->page_ptr + 1;
}
/*
* Encode the reply stored in the stateowner reply cache
*
* XDR note: do not encode rp->rp_buflen: the buffer contains the
* previously sent already encoded operation.
*/
void
nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
{
__be32 *p;
struct nfs4_replay *rp = op->replay;
p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
if (!p) {
WARN_ON_ONCE(1);
return;
}
*p++ = cpu_to_be32(op->opnum);
*p++ = rp->rp_status; /* already xdr'ed */
p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
}
void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
{
struct nfsd4_compoundargs *args = rqstp->rq_argp;
if (args->ops != args->iops) {
vfree(args->ops);
args->ops = args->iops;
}
while (args->to_free) {
struct svcxdr_tmpbuf *tb = args->to_free;
args->to_free = tb->next;
kfree(tb);
}
}
bool
nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
{
struct nfsd4_compoundargs *args = rqstp->rq_argp;
/* svcxdr_tmp_alloc */
args->to_free = NULL;
args->xdr = xdr;
args->ops = args->iops;
args->rqstp = rqstp;
return nfsd4_decode_compound(args);
}
bool
nfs4svc_encode_compoundres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
{
struct nfsd4_compoundres *resp = rqstp->rq_resp;
__be32 *p;
/*
* Send buffer space for the following items is reserved
* at the top of nfsd4_proc_compound().
*/
p = resp->statusp;
*p++ = resp->cstate.status;
*p++ = htonl(resp->taglen);
memcpy(p, resp->tag, resp->taglen);
p += XDR_QUADLEN(resp->taglen);
*p++ = htonl(resp->opcnt);
nfsd4_sequence_done(resp);
return true;
}