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/*
* linux/fs/nfsd/xdr.c
*
* XDR support for nfsd
*
* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
*/
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/nfs.h>
#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/svc.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/xdr.h>
#define NFSDDBG_FACILITY NFSDDBG_XDR
#ifdef NFSD_OPTIMIZE_SPACE
# define inline
#endif
/*
* Mapping of S_IF* types to NFS file types
*/
static u32 nfs_ftypes[] = {
NFNON, NFCHR, NFCHR, NFBAD,
NFDIR, NFBAD, NFBLK, NFBAD,
NFREG, NFBAD, NFLNK, NFBAD,
NFSOCK, NFBAD, NFLNK, NFBAD,
};
/*
* XDR functions for basic NFS types
*/
static inline u32 *
decode_fh(u32 *p, struct svc_fh *fhp)
{
fh_init(fhp, NFS_FHSIZE);
memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE);
fhp->fh_handle.fh_size = NFS_FHSIZE;
/* FIXME: Look up export pointer here and verify
* Sun Secure RPC if requested */
return p + (NFS_FHSIZE >> 2);
}
static inline u32 *
encode_fh(u32 *p, struct svc_fh *fhp)
{
memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
return p + (NFS_FHSIZE>> 2);
}
/*
* Decode a file name and make sure that the path contains
* no slashes or null bytes.
*/
static inline u32 *
decode_filename(u32 *p, char **namp, int *lenp)
{
char *name;
int i;
if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXNAMLEN)) != NULL) {
for (i = 0, name = *namp; i < *lenp; i++, name++) {
if (*name == '\0' || *name == '/')
return NULL;
}
}
return p;
}
static inline u32 *
decode_pathname(u32 *p, char **namp, int *lenp)
{
char *name;
int i;
if ((p = xdr_decode_string(p, namp, lenp, NFS_MAXPATHLEN)) != NULL) {
for (i = 0, name = *namp; i < *lenp; i++, name++) {
if (*name == '\0')
return NULL;
}
}
return p;
}
static inline u32 *
decode_sattr(u32 *p, struct iattr *iap)
{
u32 tmp, tmp1;
iap->ia_valid = 0;
/* Sun client bug compatibility check: some sun clients seem to
* put 0xffff in the mode field when they mean 0xffffffff.
* Quoting the 4.4BSD nfs server code: Nah nah nah nah na nah.
*/
if ((tmp = ntohl(*p++)) != (u32)-1 && tmp != 0xffff) {
iap->ia_valid |= ATTR_MODE;
iap->ia_mode = tmp;
}
if ((tmp = ntohl(*p++)) != (u32)-1) {
iap->ia_valid |= ATTR_UID;
iap->ia_uid = tmp;
}
if ((tmp = ntohl(*p++)) != (u32)-1) {
iap->ia_valid |= ATTR_GID;
iap->ia_gid = tmp;
}
if ((tmp = ntohl(*p++)) != (u32)-1) {
iap->ia_valid |= ATTR_SIZE;
iap->ia_size = tmp;
}
tmp = ntohl(*p++); tmp1 = ntohl(*p++);
if (tmp != (u32)-1 && tmp1 != (u32)-1) {
iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
iap->ia_atime = tmp;
}
tmp = ntohl(*p++); tmp1 = ntohl(*p++);
if (tmp != (u32)-1 && tmp1 != (u32)-1) {
iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
iap->ia_mtime = tmp;
}
return p;
}
static inline u32 *
encode_fattr(struct svc_rqst *rqstp, u32 *p, struct inode *inode)
{
int type = (inode->i_mode & S_IFMT);
*p++ = htonl(nfs_ftypes[type >> 12]);
*p++ = htonl((u32) inode->i_mode);
*p++ = htonl((u32) inode->i_nlink);
*p++ = htonl((u32) nfsd_ruid(rqstp, inode->i_uid));
*p++ = htonl((u32) nfsd_rgid(rqstp, inode->i_gid));
if (S_ISLNK(type) && inode->i_size > NFS_MAXPATHLEN) {
*p++ = htonl(NFS_MAXPATHLEN);
} else {
*p++ = htonl((u32) inode->i_size);
}
*p++ = htonl((u32) inode->i_blksize);
if (S_ISCHR(type) || S_ISBLK(type))
*p++ = htonl((u32) inode->i_rdev);
else
*p++ = htonl(0xffffffff);
*p++ = htonl((u32) inode->i_blocks);
*p++ = htonl((u32) inode->i_dev);
*p++ = htonl((u32) inode->i_ino);
*p++ = htonl((u32) inode->i_atime);
*p++ = 0;
*p++ = htonl((u32) lease_get_mtime(inode));
*p++ = 0;
*p++ = htonl((u32) inode->i_ctime);
*p++ = 0;
return p;
}
/*
* Check buffer bounds after decoding arguments
*/
static inline int
xdr_argsize_check(struct svc_rqst *rqstp, u32 *p)
{
struct svc_buf *buf = &rqstp->rq_argbuf;
return p - buf->base <= buf->buflen;
}
static inline int
xdr_ressize_check(struct svc_rqst *rqstp, u32 *p)
{
struct svc_buf *buf = &rqstp->rq_resbuf;
buf->len = p - buf->base;
dprintk("nfsd: ressize_check p %p base %p len %d\n",
p, buf->base, buf->buflen);
return (buf->len <= buf->buflen);
}
/*
* XDR decode functions
*/
int
nfssvc_decode_void(struct svc_rqst *rqstp, u32 *p, void *dummy)
{
return xdr_argsize_check(rqstp, p);
}
int
nfssvc_decode_fhandle(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
{
if (!(p = decode_fh(p, fhp)))
return 0;
return xdr_argsize_check(rqstp, p);
}
int
nfssvc_decode_sattrargs(struct svc_rqst *rqstp, u32 *p,
struct nfsd_sattrargs *args)
{
if (!(p = decode_fh(p, &args->fh))
|| !(p = decode_sattr(p, &args->attrs)))
return 0;
return xdr_argsize_check(rqstp, p);
}
int
nfssvc_decode_diropargs(struct svc_rqst *rqstp, u32 *p,
struct nfsd_diropargs *args)
{
if (!(p = decode_fh(p, &args->fh))
|| !(p = decode_filename(p, &args->name, &args->len)))
return 0;
return xdr_argsize_check(rqstp, p);
}
int
nfssvc_decode_readargs(struct svc_rqst *rqstp, u32 *p,
struct nfsd_readargs *args)
{
if (!(p = decode_fh(p, &args->fh)))
return 0;
args->offset = ntohl(*p++);
args->count = ntohl(*p++);
args->totalsize = ntohl(*p++);
return xdr_argsize_check(rqstp, p);
}
int
nfssvc_decode_writeargs(struct svc_rqst *rqstp, u32 *p,
struct nfsd_writeargs *args)
{
if (!(p = decode_fh(p, &args->fh)))
return 0;
p++; /* beginoffset */
args->offset = ntohl(*p++); /* offset */
p++; /* totalcount */
args->len = ntohl(*p++);
args->data = (char *) p;
p += XDR_QUADLEN(args->len);
return xdr_argsize_check(rqstp, p);
}
int
nfssvc_decode_createargs(struct svc_rqst *rqstp, u32 *p,
struct nfsd_createargs *args)
{
if (!(p = decode_fh(p, &args->fh))
|| !(p = decode_filename(p, &args->name, &args->len))
|| !(p = decode_sattr(p, &args->attrs)))
return 0;
return xdr_argsize_check(rqstp, p);
}
int
nfssvc_decode_renameargs(struct svc_rqst *rqstp, u32 *p,
struct nfsd_renameargs *args)
{
if (!(p = decode_fh(p, &args->ffh))
|| !(p = decode_filename(p, &args->fname, &args->flen))
|| !(p = decode_fh(p, &args->tfh))
|| !(p = decode_filename(p, &args->tname, &args->tlen)))
return 0;
return xdr_argsize_check(rqstp, p);
}
int
nfssvc_decode_linkargs(struct svc_rqst *rqstp, u32 *p,
struct nfsd_linkargs *args)
{
if (!(p = decode_fh(p, &args->ffh))
|| !(p = decode_fh(p, &args->tfh))
|| !(p = decode_filename(p, &args->tname, &args->tlen)))
return 0;
return xdr_argsize_check(rqstp, p);
}
int
nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, u32 *p,
struct nfsd_symlinkargs *args)
{
if (!(p = decode_fh(p, &args->ffh))
|| !(p = decode_filename(p, &args->fname, &args->flen))
|| !(p = decode_pathname(p, &args->tname, &args->tlen))
|| !(p = decode_sattr(p, &args->attrs)))
return 0;
return xdr_argsize_check(rqstp, p);
}
int
nfssvc_decode_readdirargs(struct svc_rqst *rqstp, u32 *p,
struct nfsd_readdirargs *args)
{
if (!(p = decode_fh(p, &args->fh)))
return 0;
args->cookie = ntohl(*p++);
args->count = ntohl(*p++);
return xdr_argsize_check(rqstp, p);
}
/*
* XDR encode functions
*/
int
nfssvc_encode_void(struct svc_rqst *rqstp, u32 *p, void *dummy)
{
return xdr_ressize_check(rqstp, p);
}
int
nfssvc_encode_attrstat(struct svc_rqst *rqstp, u32 *p,
struct nfsd_attrstat *resp)
{
p = encode_fattr(rqstp, p, resp->fh.fh_dentry->d_inode);
return xdr_ressize_check(rqstp, p);
}
int
nfssvc_encode_diropres(struct svc_rqst *rqstp, u32 *p,
struct nfsd_diropres *resp)
{
p = encode_fh(p, &resp->fh);
p = encode_fattr(rqstp, p, resp->fh.fh_dentry->d_inode);
return xdr_ressize_check(rqstp, p);
}
int
nfssvc_encode_readlinkres(struct svc_rqst *rqstp, u32 *p,
struct nfsd_readlinkres *resp)
{
*p++ = htonl(resp->len);
p += XDR_QUADLEN(resp->len);
return xdr_ressize_check(rqstp, p);
}
int
nfssvc_encode_readres(struct svc_rqst *rqstp, u32 *p,
struct nfsd_readres *resp)
{
p = encode_fattr(rqstp, p, resp->fh.fh_dentry->d_inode);
*p++ = htonl(resp->count);
p += XDR_QUADLEN(resp->count);
return xdr_ressize_check(rqstp, p);
}
int
nfssvc_encode_readdirres(struct svc_rqst *rqstp, u32 *p,
struct nfsd_readdirres *resp)
{
p += XDR_QUADLEN(resp->count);
return xdr_ressize_check(rqstp, p);
}
int
nfssvc_encode_statfsres(struct svc_rqst *rqstp, u32 *p,
struct nfsd_statfsres *resp)
{
struct statfs *stat = &resp->stats;
*p++ = htonl(8 * 1024); /* max transfer size */
*p++ = htonl(stat->f_bsize);
*p++ = htonl(stat->f_blocks);
*p++ = htonl(stat->f_bfree);
*p++ = htonl(stat->f_bavail);
return xdr_ressize_check(rqstp, p);
}
int
nfssvc_encode_entry(struct readdir_cd *cd, const char *name,
int namlen, loff_t offset, ino_t ino, unsigned int d_type)
{
u32 *p = cd->buffer;
int buflen, slen;
/*
dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
namlen, name, offset, ino);
*/
if (offset > ~((u32) 0))
return -EINVAL;
if (cd->offset)
*cd->offset = htonl(offset);
if (namlen > NFS2_MAXNAMLEN)
namlen = NFS2_MAXNAMLEN;/* truncate filename */
slen = XDR_QUADLEN(namlen);
if ((buflen = cd->buflen - slen - 4) < 0) {
cd->eob = 1;
return -EINVAL;
}
*p++ = xdr_one; /* mark entry present */
*p++ = htonl((u32) ino); /* file id */
p = xdr_encode_array(p, name, namlen);/* name length & name */
cd->offset = p; /* remember pointer */
*p++ = ~(u32) 0; /* offset of next entry */
cd->buflen = buflen;
cd->buffer = p;
return 0;
}
/*
* XDR release functions
*/
int
nfssvc_release_fhandle(struct svc_rqst *rqstp, u32 *p,
struct nfsd_fhandle *resp)
{
fh_put(&resp->fh);
return 1;
}
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