static int decode_path(struct xdr_stream *xdr)
{
u32 length, recvd;
__be32 *p;
p = xdr_inline_decode(xdr, 4);
if (unlikely(p == NULL))
goto out_overflow;
length = be32_to_cpup(p);
if (unlikely(length >= xdr->buf->page_len || length > NFS_MAXPATHLEN))
goto out_size;
recvd = xdr_read_pages(xdr, length);
if (unlikely(length > recvd))
goto out_cheating;
xdr_terminate_string(xdr->buf, length);
return 0;
out_size:
dprintk("NFS: returned pathname too long: %u\n", length);
return -ENAMETOOLONG;
out_cheating:
dprintk("NFS: server cheating in pathname result: "
"length %u > received %u\n", length, recvd);
return -EIO;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EIO;
}
/*
* typedef opaque nfsdata<>;
*/
static int decode_nfsdata(struct xdr_stream *xdr, struct nfs_readres *result)
{
u32 recvd, count;
__be32 *p;
p = xdr_inline_decode(xdr, 4);
if (unlikely(p == NULL))
goto out_overflow;
count = be32_to_cpup(p);
recvd = xdr_read_pages(xdr, count);
if (unlikely(count > recvd))
goto out_cheating;
out:
result->eof = 0; /* NFSv2 does not pass EOF flag on the wire. */
result->count = count;
return count;
out_cheating:
dprintk("NFS: server cheating in read result: "
"count %u > recvd %u\n", count, recvd);
count = recvd;
goto out;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EIO;
}
static int decode_nfspath3(struct xdr_stream *xdr)
{
u32 recvd, count;
size_t hdrlen;
__be32 *p;
p = xdr_inline_decode(xdr, 4);
if (unlikely(p == NULL))
goto out_overflow;
count = be32_to_cpup(p);
if (unlikely(count >= xdr->buf->page_len || count > NFS3_MAXPATHLEN))
goto out_nametoolong;
hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
recvd = xdr->buf->len - hdrlen;
if (unlikely(count > recvd))
goto out_cheating;
xdr_read_pages(xdr, count);
xdr_terminate_string(xdr->buf, count);
return 0;
out_nametoolong:
dprintk("NFS: returned pathname too long: %u\n", count);
return -ENAMETOOLONG;
out_cheating:
dprintk("NFS: server cheating in pathname result: "
"count %u > recvd %u\n", count, recvd);
return -EIO;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EIO;
}
/*
* 2.2.17. readdirres
*
* union readdirres switch (stat status) {
* case NFS_OK:
* struct {
* entry *entries;
* bool eof;
* } readdirok;
* default:
* void;
* };
*
* Read the directory contents into the page cache, but don't
* touch them. The actual decoding is done by nfs2_decode_dirent()
* during subsequent nfs_readdir() calls.
*/
static int decode_readdirok(struct xdr_stream *xdr)
{
u32 recvd, pglen;
size_t hdrlen;
pglen = xdr->buf->page_len;
hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
recvd = xdr->buf->len - hdrlen;
if (unlikely(pglen > recvd))
goto out_cheating;
out:
xdr_read_pages(xdr, pglen);
return pglen;
out_cheating:
dprintk("NFS: server cheating in readdir result: "
"pglen %u > recvd %u\n", pglen, recvd);
pglen = recvd;
goto out;
}
static int decode_read3resok(struct xdr_stream *xdr,
struct nfs_readres *result)
{
u32 eof, count, ocount, recvd;
size_t hdrlen;
__be32 *p;
p = xdr_inline_decode(xdr, 4 + 4 + 4);
if (unlikely(p == NULL))
goto out_overflow;
count = be32_to_cpup(p++);
eof = be32_to_cpup(p++);
ocount = be32_to_cpup(p++);
if (unlikely(ocount != count))
goto out_mismatch;
hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base;
recvd = xdr->buf->len - hdrlen;
if (unlikely(count > recvd))
goto out_cheating;
out:
xdr_read_pages(xdr, count);
result->eof = eof;
result->count = count;
return count;
out_mismatch:
dprintk("NFS: READ count doesn't match length of opaque: "
"count %u != ocount %u\n", count, ocount);
return -EIO;
out_cheating:
dprintk("NFS: server cheating in read result: "
"count %u > recvd %u\n", count, recvd);
count = recvd;
eof = 0;
goto out;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EIO;
}
/*
* 2.2.17. readdirres
*
* union readdirres switch (stat status) {
* case NFS_OK:
* struct {
* entry *entries;
* bool eof;
* } readdirok;
* default:
* void;
* };
*
* Read the directory contents into the page cache, but don't
* touch them. The actual decoding is done by nfs2_decode_dirent()
* during subsequent nfs_readdir() calls.
*/
static int decode_readdirok(struct xdr_stream *xdr)
{
return xdr_read_pages(xdr, xdr->buf->page_len);
}
