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/*
* linux/fs/nfs/callback_xdr.c
*
* Copyright (C) 2004 Trond Myklebust
*
* NFSv4 callback encode/decode procedures
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/sunrpc/svc.h>
#include <linux/nfs4.h>
#include <linux/nfs_fs.h>
#include "nfs4_fs.h"
#include "callback.h"
#define CB_OP_TAGLEN_MAXSZ (512)
#define CB_OP_HDR_RES_MAXSZ (2 + CB_OP_TAGLEN_MAXSZ)
#define CB_OP_GETATTR_BITMAP_MAXSZ (4)
#define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
CB_OP_GETATTR_BITMAP_MAXSZ + \
2 + 2 + 3 + 3)
#define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
#define NFSDBG_FACILITY NFSDBG_CALLBACK
typedef unsigned (*callback_process_op_t)(void *, void *);
typedef unsigned (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *);
typedef unsigned (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *);
struct callback_op {
callback_process_op_t process_op;
callback_decode_arg_t decode_args;
callback_encode_res_t encode_res;
long res_maxsize;
};
static struct callback_op callback_ops[];
static int nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp)
{
return htonl(NFS4_OK);
}
static int nfs4_decode_void(struct svc_rqst *rqstp, uint32_t *p, void *dummy)
{
return xdr_argsize_check(rqstp, p);
}
static int nfs4_encode_void(struct svc_rqst *rqstp, uint32_t *p, void *dummy)
{
return xdr_ressize_check(rqstp, p);
}
static uint32_t *read_buf(struct xdr_stream *xdr, int nbytes)
{
uint32_t *p;
p = xdr_inline_decode(xdr, nbytes);
if (unlikely(p == NULL))
printk(KERN_WARNING "NFSv4 callback reply buffer overflowed!\n");
return p;
}
static unsigned decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str)
{
uint32_t *p;
p = read_buf(xdr, 4);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
*len = ntohl(*p);
if (*len != 0) {
p = read_buf(xdr, *len);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
*str = (const char *)p;
} else
*str = NULL;
return 0;
}
static unsigned decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
{
uint32_t *p;
p = read_buf(xdr, 4);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
fh->size = ntohl(*p);
if (fh->size > NFS4_FHSIZE)
return htonl(NFS4ERR_BADHANDLE);
p = read_buf(xdr, fh->size);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
memcpy(&fh->data[0], p, fh->size);
memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
return 0;
}
static unsigned decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
{
uint32_t *p;
unsigned int attrlen;
p = read_buf(xdr, 4);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
attrlen = ntohl(*p);
p = read_buf(xdr, attrlen << 2);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
if (likely(attrlen > 0))
bitmap[0] = ntohl(*p++);
if (attrlen > 1)
bitmap[1] = ntohl(*p);
return 0;
}
static unsigned decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
{
uint32_t *p;
p = read_buf(xdr, 16);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
memcpy(stateid->data, p, 16);
return 0;
}
static unsigned decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
{
uint32_t *p;
unsigned int minor_version;
unsigned status;
status = decode_string(xdr, &hdr->taglen, &hdr->tag);
if (unlikely(status != 0))
return status;
/* We do not like overly long tags! */
if (hdr->taglen > CB_OP_TAGLEN_MAXSZ-12 || hdr->taglen < 0) {
printk("NFSv4 CALLBACK %s: client sent tag of length %u\n",
__FUNCTION__, hdr->taglen);
return htonl(NFS4ERR_RESOURCE);
}
p = read_buf(xdr, 12);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
minor_version = ntohl(*p++);
/* Check minor version is zero. */
if (minor_version != 0) {
printk(KERN_WARNING "%s: NFSv4 server callback with illegal minor version %u!\n",
__FUNCTION__, minor_version);
return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
}
hdr->callback_ident = ntohl(*p++);
hdr->nops = ntohl(*p);
return 0;
}
static unsigned decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
{
uint32_t *p;
p = read_buf(xdr, 4);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
*op = ntohl(*p);
return 0;
}
static unsigned decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args)
{
unsigned status;
status = decode_fh(xdr, &args->fh);
if (unlikely(status != 0))
goto out;
args->addr = &rqstp->rq_addr;
status = decode_bitmap(xdr, args->bitmap);
out:
dprintk("%s: exit with status = %d\n", __FUNCTION__, status);
return status;
}
static unsigned decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args)
{
uint32_t *p;
unsigned status;
args->addr = &rqstp->rq_addr;
status = decode_stateid(xdr, &args->stateid);
if (unlikely(status != 0))
goto out;
p = read_buf(xdr, 4);
if (unlikely(p == NULL)) {
status = htonl(NFS4ERR_RESOURCE);
goto out;
}
args->truncate = ntohl(*p);
status = decode_fh(xdr, &args->fh);
out:
dprintk("%s: exit with status = %d\n", __FUNCTION__, status);
return 0;
}
static unsigned encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
{
uint32_t *p;
p
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