AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-11-24 11:50:52 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity
026fec7e7c
linux_dsm_epyc7002/fs/nfs/callback_xdr.c
Christoph Hellwig 026fec7e7c sunrpc: properly type pc_decode callbacks 
Drop the argp argument as it can trivially be derived from the rqstp
argument.  With that all functions now have the same prototype, and we
can remove the unsafe casting to kxdrproc_t.

Signed-off-by: Christoph Hellwig <hch@lst.de>
2017-05-15 17:42:24 +02:00

1033 lines
25 KiB
C
Raw Blame History

/*
* linux/fs/nfs/callback_xdr.c
*
* Copyright (C) 2004 Trond Myklebust
*
* NFSv4 callback encode/decode procedures
*/
#include <linux/kernel.h>
#include <linux/sunrpc/svc.h>
#include <linux/nfs4.h>
#include <linux/nfs_fs.h>
#include <linux/ratelimit.h>
#include <linux/printk.h>
#include <linux/slab.h>
#include <linux/sunrpc/bc_xprt.h>
#include "nfs4_fs.h"
#include "callback.h"
#include "internal.h"
#include "nfs4session.h"
#define CB_OP_TAGLEN_MAXSZ (512)
#define CB_OP_HDR_RES_MAXSZ (2 * 4) // opcode, status
#define CB_OP_GETATTR_BITMAP_MAXSZ (4 * 4) // bitmap length, 3 bitmaps
#define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
CB_OP_GETATTR_BITMAP_MAXSZ + \
/* change, size, ctime, mtime */\
(2 + 2 + 3 + 3) * 4)
#define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
#if defined(CONFIG_NFS_V4_1)
#define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
#define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
#define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
NFS4_MAX_SESSIONID_LEN + \
(1 + 3) * 4) // seqid, 3 slotids
#define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
#define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
#define CB_OP_NOTIFY_LOCK_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
#endif /* CONFIG_NFS_V4_1 */
#define NFSDBG_FACILITY NFSDBG_CALLBACK
/* Internal error code */
#define NFS4ERR_RESOURCE_HDR 11050
struct callback_op {
__be32 (*process_op)(void *, void *, struct cb_process_state *);
__be32 (*decode_args)(struct svc_rqst *, struct xdr_stream *, void *);
__be32 (*encode_res)(struct svc_rqst *, struct xdr_stream *,
const void *);
long res_maxsize;
};
static struct callback_op callback_ops[];
static __be32 nfs4_callback_null(struct svc_rqst *rqstp)
{
return htonl(NFS4_OK);
}
static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p)
{
return xdr_argsize_check(rqstp, p);
}
static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
{
return xdr_ressize_check(rqstp, p);
}
static __be32 *read_buf(struct xdr_stream *xdr, size_t nbytes)
{
__be32 *p;
p = xdr_inline_decode(xdr, nbytes);
if (unlikely(p == NULL))
printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed!\n");
return p;
}
static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len,
const char **str, size_t maxlen)
{
ssize_t err;
err = xdr_stream_decode_opaque_inline(xdr, (void **)str, maxlen);
if (err < 0)
return cpu_to_be32(NFS4ERR_RESOURCE);
*len = err;
return 0;
}
static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
{
__be32 *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 __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
{
__be32 *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 __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
{
__be32 *p;
p = read_buf(xdr, NFS4_STATEID_SIZE);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
memcpy(stateid->data, p, NFS4_STATEID_SIZE);
return 0;
}
static __be32 decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
{
stateid->type = NFS4_DELEGATION_STATEID_TYPE;
return decode_stateid(xdr, stateid);
}
static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
{
__be32 *p;
__be32 status;
status = decode_string(xdr, &hdr->taglen, &hdr->tag, CB_OP_TAGLEN_MAXSZ);
if (unlikely(status != 0))
return status;
p = read_buf(xdr, 12);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
hdr->minorversion = ntohl(*p++);
/* Check for minor version support */
if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) {
hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */
} else {
pr_warn_ratelimited("NFS: %s: NFSv4 server callback with "
"illegal minor version %u!\n",
__func__, hdr->minorversion);
return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
}
hdr->nops = ntohl(*p);
return 0;
}
static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
{
__be32 *p;
p = read_buf(xdr, 4);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE_HDR);
*op = ntohl(*p);
return 0;
}
static __be32 decode_getattr_args(struct svc_rqst *rqstp,
struct xdr_stream *xdr, void *argp)
{
struct cb_getattrargs *args = argp;
__be32 status;
status = decode_fh(xdr, &args->fh);
if (unlikely(status != 0))
return status;
return decode_bitmap(xdr, args->bitmap);
}
static __be32 decode_recall_args(struct svc_rqst *rqstp,
struct xdr_stream *xdr, void *argp)
{
struct cb_recallargs *args = argp;
__be32 *p;
__be32 status;
status = decode_delegation_stateid(xdr, &args->stateid);
if (unlikely(status != 0))
return status;
p = read_buf(xdr, 4);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
args->truncate = ntohl(*p);
return decode_fh(xdr, &args->fh);
}
#if defined(CONFIG_NFS_V4_1)
static __be32 decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
{
stateid->type = NFS4_LAYOUT_STATEID_TYPE;
return decode_stateid(xdr, stateid);
}
static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
struct xdr_stream *xdr, void *argp)
{
struct cb_layoutrecallargs *args = argp;
__be32 *p;
__be32 status = 0;
uint32_t iomode;
p = read_buf(xdr, 4 * sizeof(uint32_t));
if (unlikely(p == NULL))
return htonl(NFS4ERR_BADXDR);
args->cbl_layout_type = ntohl(*p++);
/* Depite the spec's xdr, iomode really belongs in the FILE switch,
* as it is unusable and ignored with the other types.
*/
iomode = ntohl(*p++);
args->cbl_layoutchanged = ntohl(*p++);
args->cbl_recall_type = ntohl(*p++);
if (args->cbl_recall_type == RETURN_FILE) {
args->cbl_range.iomode = iomode;
status = decode_fh(xdr, &args->cbl_fh);
if (unlikely(status != 0))
return status;
p = read_buf(xdr, 2 * sizeof(uint64_t));
if (unlikely(p == NULL))
return htonl(NFS4ERR_BADXDR);
p = xdr_decode_hyper(p, &args->cbl_range.offset);
p = xdr_decode_hyper(p, &args->cbl_range.length);
return decode_layout_stateid(xdr, &args->cbl_stateid);
} else if (args->cbl_recall_type == RETURN_FSID) {
p = read_buf(xdr, 2 * sizeof(uint64_t));
if (unlikely(p == NULL))
return htonl(NFS4ERR_BADXDR);
p = xdr_decode_hyper(p, &args->cbl_fsid.major);
p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
} else if (args->cbl_recall_type != RETURN_ALL)
return htonl(NFS4ERR_BADXDR);
return 0;
}
static
__be32 decode_devicenotify_args(struct svc_rqst *rqstp,
struct xdr_stream *xdr,
void *argp)
{
struct cb_devicenotifyargs *args = argp;
__be32 *p;
__be32 status = 0;
u32 tmp;
int n, i;
args->ndevs = 0;
/* Num of device notifications */
p = read_buf(xdr, sizeof(uint32_t));
if (unlikely(p == NULL)) {
status = htonl(NFS4ERR_BADXDR);
goto out;
}
n = ntohl(*p++);
if (n <= 0)
goto out;
if (n > ULONG_MAX / sizeof(*args->devs)) {
status = htonl(NFS4ERR_BADXDR);
goto out;
}
args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL);
if (!args->devs) {
status = htonl(NFS4ERR_DELAY);
goto out;
}
/* Decode each dev notification */
for (i = 0; i < n; i++) {
struct cb_devicenotifyitem *dev = &args->devs[i];
p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE);
if (unlikely(p == NULL)) {
status = htonl(NFS4ERR_BADXDR);
goto err;
}
tmp = ntohl(*p++); /* bitmap size */
if (tmp != 1) {
status = htonl(NFS4ERR_INVAL);
goto err;
}
dev->cbd_notify_type = ntohl(*p++);
if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
status = htonl(NFS4ERR_INVAL);
goto err;
}
tmp = ntohl(*p++); /* opaque size */
if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
(tmp != NFS4_DEVICEID4_SIZE + 8)) ||
((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
(tmp != NFS4_DEVICEID4_SIZE + 4))) {
status = htonl(NFS4ERR_INVAL);
goto err;
}
dev->cbd_layout_type = ntohl(*p++);
memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
p = read_buf(xdr, sizeof(uint32_t));
if (unlikely(p == NULL)) {
status = htonl(NFS4ERR_BADXDR);
goto err;
}
dev->cbd_immediate = ntohl(*p++);
} else {
dev->cbd_immediate = 0;
}
args->ndevs++;
dprintk("%s: type %d layout 0x%x immediate %d\n",
__func__, dev->cbd_notify_type, dev->cbd_layout_type,
dev->cbd_immediate);
}
out:
dprintk("%s: status %d ndevs %d\n",
__func__, ntohl(status), args->ndevs);
return status;
err:
kfree(args->devs);
goto out;
}
static __be32 decode_sessionid(struct xdr_stream *xdr,
struct nfs4_sessionid *sid)
{
__be32 *p;
p = read_buf(xdr, NFS4_MAX_SESSIONID_LEN);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN);
return 0;
}
static __be32 decode_rc_list(struct xdr_stream *xdr,
struct referring_call_list *rc_list)
{
__be32 *p;
int i;
__be32 status;
status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
if (status)
goto out;
status = htonl(NFS4ERR_RESOURCE);
p = read_buf(xdr, sizeof(uint32_t));
if (unlikely(p == NULL))
goto out;
rc_list->rcl_nrefcalls = ntohl(*p++);
if (rc_list->rcl_nrefcalls) {
p = read_buf(xdr,
rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
if (unlikely(p == NULL))
goto out;
rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls,
sizeof(*rc_list->rcl_refcalls),
GFP_KERNEL);
if (unlikely(rc_list->rcl_refcalls == NULL))
goto out;
for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
}
}
status = 0;
out:
return status;
}
static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
struct xdr_stream *xdr,
void *argp)
{
struct cb_sequenceargs *args = argp;
__be32 *p;
int i;
__be32 status;
status = decode_sessionid(xdr, &args->csa_sessionid);
if (status)
return status;
p = read_buf(xdr, 5 * sizeof(uint32_t));
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
args->csa_addr = svc_addr(rqstp);
args->csa_sequenceid = ntohl(*p++);
args->csa_slotid = ntohl(*p++);
args->csa_highestslotid = ntohl(*p++);
args->csa_cachethis = ntohl(*p++);
args->csa_nrclists = ntohl(*p++);
args->csa_rclists = NULL;
if (args->csa_nrclists) {
args->csa_rclists = kmalloc_array(args->csa_nrclists,
sizeof(*args->csa_rclists),
GFP_KERNEL);
if (unlikely(args->csa_rclists == NULL))
return htonl(NFS4ERR_RESOURCE);
for (i = 0; i < args->csa_nrclists; i++) {
status = decode_rc_list(xdr, &args->csa_rclists[i]);
if (status) {
args->csa_nrclists = i;
goto out_free;
}
}
}
return 0;
out_free:
for (i = 0; i < args->csa_nrclists; i++)
kfree(args->csa_rclists[i].rcl_refcalls);
kfree(args->csa_rclists);
return status;
}
static __be32 decode_recallany_args(struct svc_rqst *rqstp,
struct xdr_stream *xdr,
void *argp)
{
struct cb_recallanyargs *args = argp;
uint32_t bitmap[2];
__be32 *p, status;
p = read_buf(xdr, 4);
if (unlikely(p == NULL))
return htonl(NFS4ERR_BADXDR);
args->craa_objs_to_keep = ntohl(*p++);
status = decode_bitmap(xdr, bitmap);
if (unlikely(status))
return status;
args->craa_type_mask = bitmap[0];
return 0;
}
static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
struct xdr_stream *xdr,
void *argp)
{
struct cb_recallslotargs *args = argp;
__be32 *p;
p = read_buf(xdr, 4);
if (unlikely(p == NULL))
return htonl(NFS4ERR_BADXDR);
args->crsa_target_highest_slotid = ntohl(*p++);
return 0;
}
static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args)
{
__be32 *p;
unsigned int len;
p = read_buf(xdr, 12);
if (unlikely(p == NULL))
return htonl(NFS4ERR_BADXDR);
p = xdr_decode_hyper(p, &args->cbnl_owner.clientid);
len = be32_to_cpu(*p);
p = read_buf(xdr, len);
if (unlikely(p == NULL))
return htonl(NFS4ERR_BADXDR);
/* Only try to decode if the length is right */
if (len == 20) {
p += 2; /* skip "lock id:" */
args->cbnl_owner.s_dev = be32_to_cpu(*p++);
xdr_decode_hyper(p, &args->cbnl_owner.id);
args->cbnl_valid = true;
} else {
args->cbnl_owner.s_dev = 0;
args->cbnl_owner.id = 0;
args->cbnl_valid = false;
}
return 0;
}
static __be32 decode_notify_lock_args(struct svc_rqst *rqstp,
struct xdr_stream *xdr, void *argp)
{
struct cb_notify_lock_args *args = argp;
__be32 status;
status = decode_fh(xdr, &args->cbnl_fh);
if (unlikely(status != 0))
return status;
return decode_lockowner(xdr, args);
}
#endif /* CONFIG_NFS_V4_1 */
static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
{
if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0))
return cpu_to_be32(NFS4ERR_RESOURCE);
return 0;
}
#define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE)
#define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY)
static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep)
{
__be32 bm[2];
__be32 *p;
bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0);
bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1);
if (bm[1] != 0) {
p = xdr_reserve_space(xdr, 16);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
*p++ = htonl(2);
*p++ = bm[0];
*p++ = bm[1];
} else if (bm[0] != 0) {
p = xdr_reserve_space(xdr, 12);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
*p++ = htonl(1);
*p++ = bm[0];
} else {
p = xdr_reserve_space(xdr, 8);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
*p++ = htonl(0);
}
*savep = p;
return 0;
}
static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
{
__be32 *p;
if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
return 0;
p = xdr_reserve_space(xdr, 8);
if (unlikely(!p))
return htonl(NFS4ERR_RESOURCE);
p = xdr_encode_hyper(p, change);
return 0;
}
static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
{
__be32 *p;
if (!(bitmap[0] & FATTR4_WORD0_SIZE))
return 0;
p = xdr_reserve_space(xdr, 8);
if (unlikely(!p))
return htonl(NFS4ERR_RESOURCE);
p = xdr_encode_hyper(p, size);
return 0;
}
static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
{
__be32 *p;
p = xdr_reserve_space(xdr, 12);
if (unlikely(!p))
return htonl(NFS4ERR_RESOURCE);
p = xdr_encode_hyper(p, time->tv_sec);
*p = htonl(time->tv_nsec);
return 0;
}
static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
{
if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
return 0;
return encode_attr_time(xdr,time);
}
static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
{
if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
return 0;
return encode_attr_time(xdr,time);
}
static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
{
__be32 status;
hdr->status = xdr_reserve_space(xdr, 4);
if (unlikely(hdr->status == NULL))
return htonl(NFS4ERR_RESOURCE);
status = encode_string(xdr, hdr->taglen, hdr->tag);
if (unlikely(status != 0))
return status;
hdr->nops = xdr_reserve_space(xdr, 4);
if (unlikely(hdr->nops == NULL))
return htonl(NFS4ERR_RESOURCE);
return 0;
}
static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
{
__be32 *p;
p = xdr_reserve_space(xdr, 8);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE_HDR);
*p++ = htonl(op);
*p = res;
return 0;
}
static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr,
const void *resp)
{
const struct cb_getattrres *res = resp;
__be32 *savep = NULL;
__be32 status = res->status;
if (unlikely(status != 0))
goto out;
status = encode_attr_bitmap(xdr, res->bitmap, &savep);
if (unlikely(status != 0))
goto out;
status = encode_attr_change(xdr, res->bitmap, res->change_attr);
if (unlikely(status != 0))
goto out;
status = encode_attr_size(xdr, res->bitmap, res->size);
if (unlikely(status != 0))
goto out;
status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
if (unlikely(status != 0))
goto out;
status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
*savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
out:
return status;
}
#if defined(CONFIG_NFS_V4_1)
static __be32 encode_sessionid(struct xdr_stream *xdr,
const struct nfs4_sessionid *sid)
{
__be32 *p;
p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
memcpy(p, sid, NFS4_MAX_SESSIONID_LEN);
return 0;
}
static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
struct xdr_stream *xdr,
const void *resp)
{
const struct cb_sequenceres *res = resp;
__be32 *p;
__be32 status = res->csr_status;
if (unlikely(status != 0))
return status;
status = encode_sessionid(xdr, &res->csr_sessionid);
if (status)
return status;
p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
if (unlikely(p == NULL))
return htonl(NFS4ERR_RESOURCE);
*p++ = htonl(res->csr_sequenceid);
*p++ = htonl(res->csr_slotid);
*p++ = htonl(res->csr_highestslotid);
*p++ = htonl(res->csr_target_highestslotid);
return 0;
}
static __be32
preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
{
if (op_nr == OP_CB_SEQUENCE) {
if (nop != 0)
return htonl(NFS4ERR_SEQUENCE_POS);
} else {
if (nop == 0)
return htonl(NFS4ERR_OP_NOT_IN_SESSION);
}
switch (op_nr) {
case OP_CB_GETATTR:
case OP_CB_RECALL:
case OP_CB_SEQUENCE:
case OP_CB_RECALL_ANY:
case OP_CB_RECALL_SLOT:
case OP_CB_LAYOUTRECALL:
case OP_CB_NOTIFY_DEVICEID:
case OP_CB_NOTIFY_LOCK:
*op = &callback_ops[op_nr];
break;
case OP_CB_NOTIFY:
case OP_CB_PUSH_DELEG:
case OP_CB_RECALLABLE_OBJ_AVAIL:
case OP_CB_WANTS_CANCELLED:
return htonl(NFS4ERR_NOTSUPP);
default:
return htonl(NFS4ERR_OP_ILLEGAL);
}
return htonl(NFS_OK);
}
static void nfs4_callback_free_slot(struct nfs4_session *session,
struct nfs4_slot *slot)
{
struct nfs4_slot_table *tbl = &session->bc_slot_table;
spin_lock(&tbl->slot_tbl_lock);
/*
* Let the state manager know callback processing done.
* A single slot, so highest used slotid is either 0 or -1
*/
nfs4_free_slot(tbl, slot);
nfs4_slot_tbl_drain_complete(tbl);
spin_unlock(&tbl->slot_tbl_lock);
}
static void nfs4_cb_free_slot(struct cb_process_state *cps)
{
if (cps->slot) {
nfs4_callback_free_slot(cps->clp->cl_session, cps->slot);
cps->slot = NULL;
}
}
#else /* CONFIG_NFS_V4_1 */
static __be32
preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
{
return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
}
static void nfs4_cb_free_slot(struct cb_process_state *cps)
{
}
#endif /* CONFIG_NFS_V4_1 */
#ifdef CONFIG_NFS_V4_2
static __be32
preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
{
__be32 status = preprocess_nfs41_op(nop, op_nr, op);
if (status != htonl(NFS4ERR_OP_ILLEGAL))
return status;
if (op_nr == OP_CB_OFFLOAD)
return htonl(NFS4ERR_NOTSUPP);
return htonl(NFS4ERR_OP_ILLEGAL);
}
#else /* CONFIG_NFS_V4_2 */
static __be32
preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
{
return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
}
#endif /* CONFIG_NFS_V4_2 */
static __be32
preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
{
switch (op_nr) {
case OP_CB_GETATTR:
case OP_CB_RECALL:
*op = &callback_ops[op_nr];
break;
default:
return htonl(NFS4ERR_OP_ILLEGAL);
}
return htonl(NFS_OK);
}
static __be32 process_op(int nop, struct svc_rqst *rqstp,
struct xdr_stream *xdr_in, void *argp,
struct xdr_stream *xdr_out, void *resp,
struct cb_process_state *cps)
{
struct callback_op *op = &callback_ops[0];
unsigned int op_nr;
__be32 status;
long maxlen;
__be32 res;
status = decode_op_hdr(xdr_in, &op_nr);
if (unlikely(status))
return status;
switch (cps->minorversion) {
case 0:
status = preprocess_nfs4_op(op_nr, &op);
break;
case 1:
status = preprocess_nfs41_op(nop, op_nr, &op);
break;
case 2:
status = preprocess_nfs42_op(nop, op_nr, &op);
break;
default:
status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
}
if (status == htonl(NFS4ERR_OP_ILLEGAL))
op_nr = OP_CB_ILLEGAL;
if (status)
goto encode_hdr;
if (cps->drc_status) {
status = cps->drc_status;
goto encode_hdr;
}
maxlen = xdr_out->end - xdr_out->p;
if (maxlen > 0 && maxlen < PAGE_SIZE) {
status = op->decode_args(rqstp, xdr_in, argp);
if (likely(status == 0))
status = op->process_op(argp, resp, cps);
} else
status = htonl(NFS4ERR_RESOURCE);
encode_hdr:
res = encode_op_hdr(xdr_out, op_nr, status);
if (unlikely(res))
return res;
if (op->encode_res != NULL && status == 0)
status = op->encode_res(rqstp, xdr_out, resp);
return status;
}
/*
* Decode, process and encode a COMPOUND
*/
static __be32 nfs4_callback_compound(struct svc_rqst *rqstp)
{
struct cb_compound_hdr_arg hdr_arg = { 0 };
struct cb_compound_hdr_res hdr_res = { NULL };
struct xdr_stream xdr_in, xdr_out;
__be32 *p, status;
struct cb_process_state cps = {
.drc_status = 0,
.clp = NULL,
.net = SVC_NET(rqstp),
};
unsigned int nops = 0;
xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
if (status == htonl(NFS4ERR_RESOURCE))
return rpc_garbage_args;
if (hdr_arg.minorversion == 0) {
cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp))
goto out_invalidcred;
}
cps.minorversion = hdr_arg.minorversion;
hdr_res.taglen = hdr_arg.taglen;
hdr_res.tag = hdr_arg.tag;
if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
return rpc_system_err;
while (status == 0 && nops != hdr_arg.nops) {
status = process_op(nops, rqstp, &xdr_in,
rqstp->rq_argp, &xdr_out, rqstp->rq_resp,
&cps);
nops++;
}
/* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
* resource error in cb_compound status without returning op */
if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
status = htonl(NFS4ERR_RESOURCE);
nops--;
}
*hdr_res.status = status;
*hdr_res.nops = htonl(nops);
nfs4_cb_free_slot(&cps);
nfs_put_client(cps.clp);
return rpc_success;
out_invalidcred:
pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n");
return rpc_autherr_badcred;
}
/*
* Define NFS4 callback COMPOUND ops.
*/
static struct callback_op callback_ops[] = {
[0] = {
.res_maxsize = CB_OP_HDR_RES_MAXSZ,
},
[OP_CB_GETATTR] = {
.process_op = nfs4_callback_getattr,
.decode_args = decode_getattr_args,
.encode_res = encode_getattr_res,
.res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
},
[OP_CB_RECALL] = {
.process_op = nfs4_callback_recall,
.decode_args = decode_recall_args,
.res_maxsize = CB_OP_RECALL_RES_MAXSZ,
},
#if defined(CONFIG_NFS_V4_1)
[OP_CB_LAYOUTRECALL] = {
.process_op = nfs4_callback_layoutrecall,
.decode_args = decode_layoutrecall_args,
.res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
},
[OP_CB_NOTIFY_DEVICEID] = {
.process_op = nfs4_callback_devicenotify,
.decode_args = decode_devicenotify_args,
.res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
},
[OP_CB_SEQUENCE] = {
.process_op = nfs4_callback_sequence,
.decode_args = decode_cb_sequence_args,
.encode_res = encode_cb_sequence_res,
.res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
},
[OP_CB_RECALL_ANY] = {
.process_op = nfs4_callback_recallany,
.decode_args = decode_recallany_args,
.res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
},
[OP_CB_RECALL_SLOT] = {
.process_op = nfs4_callback_recallslot,
.decode_args = decode_recallslot_args,
.res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
},
[OP_CB_NOTIFY_LOCK] = {
.process_op = nfs4_callback_notify_lock,
.decode_args = decode_notify_lock_args,
.res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ,
},
#endif /* CONFIG_NFS_V4_1 */
};
/*
* Define NFS4 callback procedures
*/
static struct svc_procedure nfs4_callback_procedures1[] = {
[CB_NULL] = {
.pc_func = nfs4_callback_null,
.pc_decode = nfs4_decode_void,
.pc_encode = (kxdrproc_t)nfs4_encode_void,
.pc_xdrressize = 1,
},
[CB_COMPOUND] = {
.pc_func = nfs4_callback_compound,
.pc_encode = (kxdrproc_t)nfs4_encode_void,
.pc_argsize = 256,
.pc_ressize = 256,
.pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
}
};
struct svc_version nfs4_callback_version1 = {
.vs_vers = 1,
.vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
.vs_proc = nfs4_callback_procedures1,
.vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
.vs_dispatch = NULL,
.vs_hidden = true,
.vs_need_cong_ctrl = true,
};
struct svc_version nfs4_callback_version4 = {
.vs_vers = 4,
.vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
.vs_proc = nfs4_callback_procedures1,
.vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
.vs_dispatch = NULL,
.vs_hidden = true,
.vs_need_cong_ctrl = true,
};
Reference in New Issue View Git Blame Copy Permalink