callback_xdr.c 25.3 KB
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/*
 * 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>
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#include <linux/ratelimit.h>
#include <linux/printk.h>
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#include <linux/slab.h>
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#include <linux/sunrpc/bc_xprt.h>
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#include "nfs4_fs.h"
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#include "callback.h"
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#include "internal.h"
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#include "nfs4session.h"
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#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)
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#if defined(CONFIG_NFS_V4_1)
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#define CB_OP_LAYOUTRECALL_RES_MAXSZ	(CB_OP_HDR_RES_MAXSZ)
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#define CB_OP_DEVICENOTIFY_RES_MAXSZ	(CB_OP_HDR_RES_MAXSZ)
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#define CB_OP_SEQUENCE_RES_MAXSZ	(CB_OP_HDR_RES_MAXSZ + \
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					 NFS4_MAX_SESSIONID_LEN + \
					 (1 + 3) * 4) // seqid, 3 slotids
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#define CB_OP_RECALLANY_RES_MAXSZ	(CB_OP_HDR_RES_MAXSZ)
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#define CB_OP_RECALLSLOT_RES_MAXSZ	(CB_OP_HDR_RES_MAXSZ)
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#define CB_OP_NOTIFY_LOCK_RES_MAXSZ	(CB_OP_HDR_RES_MAXSZ)
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#endif /* CONFIG_NFS_V4_1 */

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#define NFSDBG_FACILITY NFSDBG_CALLBACK

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/* Internal error code */
#define NFS4ERR_RESOURCE_HDR	11050

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struct callback_op {
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	__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 *);
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	long res_maxsize;
};

static struct callback_op callback_ops[];

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static __be32 nfs4_callback_null(struct svc_rqst *rqstp)
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{
	return htonl(NFS4_OK);
}

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static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p)
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{
	return xdr_argsize_check(rqstp, p);
}

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static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
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{
	return xdr_ressize_check(rqstp, p);
}

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static __be32 *read_buf(struct xdr_stream *xdr, size_t nbytes)
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{
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	__be32 *p;
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	p = xdr_inline_decode(xdr, nbytes);
	if (unlikely(p == NULL))
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		printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed!\n");
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	return p;
}

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static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len,
		const char **str, size_t maxlen)
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{
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	ssize_t err;
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	err = xdr_stream_decode_opaque_inline(xdr, (void **)str, maxlen);
	if (err < 0)
		return cpu_to_be32(NFS4ERR_RESOURCE);
	*len = err;
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	return 0;
}

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static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
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{
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	__be32 *p;
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	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;
}

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static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
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{
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	__be32 *p;
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	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;
}

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static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
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{
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	__be32 *p;
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	p = read_buf(xdr, NFS4_STATEID_SIZE);
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	if (unlikely(p == NULL))
		return htonl(NFS4ERR_RESOURCE);
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	memcpy(stateid->data, p, NFS4_STATEID_SIZE);
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	return 0;
}

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static __be32 decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
{
	stateid->type = NFS4_DELEGATION_STATEID_TYPE;
	return decode_stateid(xdr, stateid);
}

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static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
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{
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	__be32 *p;
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	__be32 status;
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	status = decode_string(xdr, &hdr->taglen, &hdr->tag, CB_OP_TAGLEN_MAXSZ);
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	if (unlikely(status != 0))
		return status;
	p = read_buf(xdr, 12);
	if (unlikely(p == NULL))
		return htonl(NFS4ERR_RESOURCE);
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	hdr->minorversion = ntohl(*p++);
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	/* Check for minor version support */
	if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) {
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		hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */
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	} else {
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		pr_warn_ratelimited("NFS: %s: NFSv4 server callback with "
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			"illegal minor version %u!\n",
			__func__, hdr->minorversion);
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		return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
	}
	hdr->nops = ntohl(*p);
	return 0;
}

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static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
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{
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	__be32 *p;
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	p = read_buf(xdr, 4);
	if (unlikely(p == NULL))
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		return htonl(NFS4ERR_RESOURCE_HDR);
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	*op = ntohl(*p);
	return 0;
}

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static __be32 decode_getattr_args(struct svc_rqst *rqstp,
		struct xdr_stream *xdr, void *argp)
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{
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	struct cb_getattrargs *args = argp;
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	__be32 status;
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	status = decode_fh(xdr, &args->fh);
	if (unlikely(status != 0))
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		return status;
	return decode_bitmap(xdr, args->bitmap);
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}

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static __be32 decode_recall_args(struct svc_rqst *rqstp,
		struct xdr_stream *xdr, void *argp)
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{
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	struct cb_recallargs *args = argp;
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	__be32 *p;
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	__be32 status;
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	status = decode_delegation_stateid(xdr, &args->stateid);
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	if (unlikely(status != 0))
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		return status;
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	p = read_buf(xdr, 4);
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	if (unlikely(p == NULL))
		return htonl(NFS4ERR_RESOURCE);
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	args->truncate = ntohl(*p);
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	return decode_fh(xdr, &args->fh);
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}

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#if defined(CONFIG_NFS_V4_1)
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static __be32 decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
{
	stateid->type = NFS4_LAYOUT_STATEID_TYPE;
	return decode_stateid(xdr, stateid);
}
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static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
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				       struct xdr_stream *xdr, void *argp)
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{
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	struct cb_layoutrecallargs *args = argp;
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	__be32 *p;
	__be32 status = 0;
	uint32_t iomode;

	p = read_buf(xdr, 4 * sizeof(uint32_t));
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	if (unlikely(p == NULL))
		return htonl(NFS4ERR_BADXDR);
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	args->cbl_layout_type = ntohl(*p++);
	/* Depite the spec's xdr, iomode really belongs in the FILE switch,
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	 * as it is unusable and ignored with the other types.
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	 */
	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))
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			return status;
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		p = read_buf(xdr, 2 * sizeof(uint64_t));
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		if (unlikely(p == NULL))
			return htonl(NFS4ERR_BADXDR);
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		p = xdr_decode_hyper(p, &args->cbl_range.offset);
		p = xdr_decode_hyper(p, &args->cbl_range.length);
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		return decode_layout_stateid(xdr, &args->cbl_stateid);
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	} else if (args->cbl_recall_type == RETURN_FSID) {
		p = read_buf(xdr, 2 * sizeof(uint64_t));
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		if (unlikely(p == NULL))
			return htonl(NFS4ERR_BADXDR);
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		p = xdr_decode_hyper(p, &args->cbl_fsid.major);
		p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
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	} else if (args->cbl_recall_type != RETURN_ALL)
		return htonl(NFS4ERR_BADXDR);
	return 0;
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}

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static
__be32 decode_devicenotify_args(struct svc_rqst *rqstp,
				struct xdr_stream *xdr,
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				void *argp)
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{
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	struct cb_devicenotifyargs *args = argp;
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	__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;
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	if (n > ULONG_MAX / sizeof(*args->devs)) {
		status = htonl(NFS4ERR_BADXDR);
		goto out;
	}
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	args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL);
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	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;
}

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static __be32 decode_sessionid(struct xdr_stream *xdr,
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				 struct nfs4_sessionid *sid)
{
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	__be32 *p;
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	p = read_buf(xdr, NFS4_MAX_SESSIONID_LEN);
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	if (unlikely(p == NULL))
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		return htonl(NFS4ERR_RESOURCE);
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	memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN);
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	return 0;
}

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static __be32 decode_rc_list(struct xdr_stream *xdr,
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			       struct referring_call_list *rc_list)
{
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	__be32 *p;
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	int i;
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	__be32 status;
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	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;
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		rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls,
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						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;
}

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static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
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					struct xdr_stream *xdr,
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					void *argp)
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{
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	struct cb_sequenceargs *args = argp;
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	__be32 *p;
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	int i;
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	__be32 status;
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	status = decode_sessionid(xdr, &args->csa_sessionid);
	if (status)
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		return status;
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	p = read_buf(xdr, 5 * sizeof(uint32_t));
	if (unlikely(p == NULL))
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		return htonl(NFS4ERR_RESOURCE);
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	args->csa_addr = svc_addr(rqstp);
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	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) {
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		args->csa_rclists = kmalloc_array(args->csa_nrclists,
						  sizeof(*args->csa_rclists),
						  GFP_KERNEL);
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		if (unlikely(args->csa_rclists == NULL))
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			return htonl(NFS4ERR_RESOURCE);
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		for (i = 0; i < args->csa_nrclists; i++) {
			status = decode_rc_list(xdr, &args->csa_rclists[i]);
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			if (status) {
				args->csa_nrclists = i;
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				goto out_free;
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			}
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		}
	}
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	return 0;
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out_free:
	for (i = 0; i < args->csa_nrclists; i++)
		kfree(args->csa_rclists[i].rcl_refcalls);
	kfree(args->csa_rclists);
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	return status;
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}

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static __be32 decode_recallany_args(struct svc_rqst *rqstp,
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				      struct xdr_stream *xdr,
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				      void *argp)
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{
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	struct cb_recallanyargs *args = argp;
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	uint32_t bitmap[2];
	__be32 *p, status;
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	p = read_buf(xdr, 4);
	if (unlikely(p == NULL))
		return htonl(NFS4ERR_BADXDR);
	args->craa_objs_to_keep = ntohl(*p++);
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	status = decode_bitmap(xdr, bitmap);
	if (unlikely(status))
		return status;
	args->craa_type_mask = bitmap[0];
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	return 0;
}

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static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
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					struct xdr_stream *xdr,
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					void *argp)
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{
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	struct cb_recallslotargs *args = argp;
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	__be32 *p;

	p = read_buf(xdr, 4);
	if (unlikely(p == NULL))
		return htonl(NFS4ERR_BADXDR);
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	args->crsa_target_highest_slotid = ntohl(*p++);
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	return 0;
}

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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;
}

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static __be32 decode_notify_lock_args(struct svc_rqst *rqstp,
		struct xdr_stream *xdr, void *argp)
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{
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	struct cb_notify_lock_args *args = argp;
520 521 522 523
	__be32 status;

	status = decode_fh(xdr, &args->cbnl_fh);
	if (unlikely(status != 0))
524 525
		return status;
	return decode_lockowner(xdr, args);
526 527
}

528 529
#endif /* CONFIG_NFS_V4_1 */

530
static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
L
Linus Torvalds 已提交
531
{
532 533
	if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0))
		return cpu_to_be32(NFS4ERR_RESOURCE);
L
Linus Torvalds 已提交
534 535 536 537 538
	return 0;
}

#define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE)
#define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY)
539
static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep)
L
Linus Torvalds 已提交
540
{
541 542
	__be32 bm[2];
	__be32 *p;
L
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543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568

	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;
}

569
static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
L
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570
{
571
	__be32 *p;
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	if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
		return 0;
	p = xdr_reserve_space(xdr, 8);
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Harvey Harrison 已提交
576
	if (unlikely(!p))
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		return htonl(NFS4ERR_RESOURCE);
	p = xdr_encode_hyper(p, change);
	return 0;
}

582
static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
L
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583
{
584
	__be32 *p;
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	if (!(bitmap[0] & FATTR4_WORD0_SIZE))
		return 0;
	p = xdr_reserve_space(xdr, 8);
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589
	if (unlikely(!p))
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		return htonl(NFS4ERR_RESOURCE);
	p = xdr_encode_hyper(p, size);
	return 0;
}

595
static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
L
Linus Torvalds 已提交
596
{
597
	__be32 *p;
L
Linus Torvalds 已提交
598 599

	p = xdr_reserve_space(xdr, 12);
H
Harvey Harrison 已提交
600
	if (unlikely(!p))
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601 602 603 604 605 606
		return htonl(NFS4ERR_RESOURCE);
	p = xdr_encode_hyper(p, time->tv_sec);
	*p = htonl(time->tv_nsec);
	return 0;
}

607
static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
L
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608 609 610 611 612 613
{
	if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
		return 0;
	return encode_attr_time(xdr,time);
}

614
static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
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615 616 617 618 619 620
{
	if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
		return 0;
	return encode_attr_time(xdr,time);
}

621
static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
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622
{
623
	__be32 status;
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624 625 626 627 628 629 630 631 632 633 634 635 636

	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;
}

637
static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
L
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638
{
639
	__be32 *p;
L
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640 641 642
	
	p = xdr_reserve_space(xdr, 8);
	if (unlikely(p == NULL))
643
		return htonl(NFS4ERR_RESOURCE_HDR);
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644 645 646 647 648
	*p++ = htonl(op);
	*p = res;
	return 0;
}

649 650
static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr,
		const void *resp)
L
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651
{
652
	const struct cb_getattrres *res = resp;
653
	__be32 *savep = NULL;
654
	__be32 status = res->status;
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655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675
	
	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;
}

676 677
#if defined(CONFIG_NFS_V4_1)

678
static __be32 encode_sessionid(struct xdr_stream *xdr,
679 680
				 const struct nfs4_sessionid *sid)
{
681
	__be32 *p;
682

683
	p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
684 685 686
	if (unlikely(p == NULL))
		return htonl(NFS4ERR_RESOURCE);

687
	memcpy(p, sid, NFS4_MAX_SESSIONID_LEN);
688 689 690
	return 0;
}

691
static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
692
				       struct xdr_stream *xdr,
693
				       const void *resp)
694
{
695
	const struct cb_sequenceres *res = resp;
696
	__be32 *p;
697
	__be32 status = res->csr_status;
698 699

	if (unlikely(status != 0))
700
		return status;
701

702 703
	status = encode_sessionid(xdr, &res->csr_sessionid);
	if (status)
704
		return status;
705 706 707 708 709 710 711 712 713

	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);
714
	return 0;
715 716
}

717 718 719
static __be32
preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
{
720 721 722 723 724 725 726 727
	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);
	}

728 729 730
	switch (op_nr) {
	case OP_CB_GETATTR:
	case OP_CB_RECALL:
731
	case OP_CB_SEQUENCE:
732
	case OP_CB_RECALL_ANY:
A
Andy Adamson 已提交
733
	case OP_CB_RECALL_SLOT:
F
Fred Isaman 已提交
734
	case OP_CB_LAYOUTRECALL:
M
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735
	case OP_CB_NOTIFY_DEVICEID:
736
	case OP_CB_NOTIFY_LOCK:
737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752
		*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);
}

753 754
static void nfs4_callback_free_slot(struct nfs4_session *session,
		struct nfs4_slot *slot)
755 756 757 758 759 760 761 762
{
	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
	 */
763
	nfs4_free_slot(tbl, slot);
764
	nfs4_slot_tbl_drain_complete(tbl);
765 766 767
	spin_unlock(&tbl->slot_tbl_lock);
}

768
static void nfs4_cb_free_slot(struct cb_process_state *cps)
769
{
770 771 772 773
	if (cps->slot) {
		nfs4_callback_free_slot(cps->clp->cl_session, cps->slot);
		cps->slot = NULL;
	}
774 775
}

776 777 778 779 780 781 782 783
#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);
}

784
static void nfs4_cb_free_slot(struct cb_process_state *cps)
785 786
{
}
787 788
#endif /* CONFIG_NFS_V4_1 */

789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808
#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 */

809 810 811 812 813 814 815 816 817 818 819 820 821 822 823
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);
}

824
static __be32 process_op(int nop, struct svc_rqst *rqstp,
L
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		struct xdr_stream *xdr_in, void *argp,
826 827
		struct xdr_stream *xdr_out, void *resp,
		struct cb_process_state *cps)
L
Linus Torvalds 已提交
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{
829
	struct callback_op *op = &callback_ops[0];
830
	unsigned int op_nr;
831
	__be32 status;
L
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832
	long maxlen;
833
	__be32 res;
L
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834 835

	status = decode_op_hdr(xdr_in, &op_nr);
836 837
	if (unlikely(status))
		return status;
L
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838

839 840 841 842 843 844 845 846 847 848 849 850 851
	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);
	}
852 853 854

	if (status == htonl(NFS4ERR_OP_ILLEGAL))
		op_nr = OP_CB_ILLEGAL;
855 856
	if (status)
		goto encode_hdr;
857

858 859
	if (cps->drc_status) {
		status = cps->drc_status;
860 861 862
		goto encode_hdr;
	}

L
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863 864
	maxlen = xdr_out->end - xdr_out->p;
	if (maxlen > 0 && maxlen < PAGE_SIZE) {
865 866
		status = op->decode_args(rqstp, xdr_in, argp);
		if (likely(status == 0))
867
			status = op->process_op(argp, resp, cps);
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868 869 870
	} else
		status = htonl(NFS4ERR_RESOURCE);

871
encode_hdr:
L
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872
	res = encode_op_hdr(xdr_out, op_nr, status);
873 874
	if (unlikely(res))
		return res;
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875 876 877 878 879 880 881 882
	if (op->encode_res != NULL && status == 0)
		status = op->encode_res(rqstp, xdr_out, resp);
	return status;
}

/*
 * Decode, process and encode a COMPOUND
 */
883
static __be32 nfs4_callback_compound(struct svc_rqst *rqstp)
L
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884
{
885 886
	struct cb_compound_hdr_arg hdr_arg = { 0 };
	struct cb_compound_hdr_res hdr_res = { NULL };
L
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887
	struct xdr_stream xdr_in, xdr_out;
888 889 890 891
	__be32 *p, status;
	struct cb_process_state cps = {
		.drc_status = 0,
		.clp = NULL,
892
		.net = SVC_NET(rqstp),
893
	};
894
	unsigned int nops = 0;
L
Linus Torvalds 已提交
895

T
Trond Myklebust 已提交
896
	xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
L
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897

898
	p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
L
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899 900
	xdr_init_encode(&xdr_out, &rqstp->rq_res, p);

901
	status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
902
	if (status == htonl(NFS4ERR_RESOURCE))
903 904
		return rpc_garbage_args;

905
	if (hdr_arg.minorversion == 0) {
906
		cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
907
		if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp))
908
			goto out_invalidcred;
909
	}
910

911
	cps.minorversion = hdr_arg.minorversion;
L
Linus Torvalds 已提交
912 913
	hdr_res.taglen = hdr_arg.taglen;
	hdr_res.tag = hdr_arg.tag;
914 915
	if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
		return rpc_system_err;
L
Linus Torvalds 已提交
916

917
	while (status == 0 && nops != hdr_arg.nops) {
918
		status = process_op(nops, rqstp, &xdr_in,
919 920
				    rqstp->rq_argp, &xdr_out, rqstp->rq_resp,
				    &cps);
L
Linus Torvalds 已提交
921 922
		nops++;
	}
923

924 925 926 927 928 929 930
	/* 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--;
	}

L
Linus Torvalds 已提交
931 932
	*hdr_res.status = status;
	*hdr_res.nops = htonl(nops);
933
	nfs4_cb_free_slot(&cps);
934
	nfs_put_client(cps.clp);
L
Linus Torvalds 已提交
935
	return rpc_success;
936 937 938 939

out_invalidcred:
	pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n");
	return rpc_autherr_badcred;
L
Linus Torvalds 已提交
940 941 942 943 944 945 946 947 948 949
}

/*
 * Define NFS4 callback COMPOUND ops.
 */
static struct callback_op callback_ops[] = {
	[0] = {
		.res_maxsize = CB_OP_HDR_RES_MAXSZ,
	},
	[OP_CB_GETATTR] = {
950 951 952
		.process_op = nfs4_callback_getattr,
		.decode_args = decode_getattr_args,
		.encode_res = encode_getattr_res,
L
Linus Torvalds 已提交
953 954 955
		.res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
	},
	[OP_CB_RECALL] = {
956 957
		.process_op = nfs4_callback_recall,
		.decode_args = decode_recall_args,
L
Linus Torvalds 已提交
958
		.res_maxsize = CB_OP_RECALL_RES_MAXSZ,
959 960
	},
#if defined(CONFIG_NFS_V4_1)
F
Fred Isaman 已提交
961
	[OP_CB_LAYOUTRECALL] = {
962 963
		.process_op = nfs4_callback_layoutrecall,
		.decode_args = decode_layoutrecall_args,
F
Fred Isaman 已提交
964 965
		.res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
	},
M
Marc Eshel 已提交
966
	[OP_CB_NOTIFY_DEVICEID] = {
967 968
		.process_op = nfs4_callback_devicenotify,
		.decode_args = decode_devicenotify_args,
M
Marc Eshel 已提交
969 970
		.res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
	},
971
	[OP_CB_SEQUENCE] = {
972 973 974
		.process_op = nfs4_callback_sequence,
		.decode_args = decode_cb_sequence_args,
		.encode_res = encode_cb_sequence_res,
975 976
		.res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
	},
977
	[OP_CB_RECALL_ANY] = {
978 979
		.process_op = nfs4_callback_recallany,
		.decode_args = decode_recallany_args,
980 981
		.res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
	},
A
Andy Adamson 已提交
982
	[OP_CB_RECALL_SLOT] = {
983 984
		.process_op = nfs4_callback_recallslot,
		.decode_args = decode_recallslot_args,
A
Andy Adamson 已提交
985 986
		.res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
	},
987
	[OP_CB_NOTIFY_LOCK] = {
988 989
		.process_op = nfs4_callback_notify_lock,
		.decode_args = decode_notify_lock_args,
990 991
		.res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ,
	},
992
#endif /* CONFIG_NFS_V4_1 */
L
Linus Torvalds 已提交
993 994 995 996 997 998 999 1000
};

/*
 * Define NFS4 callback procedures
 */
static struct svc_procedure nfs4_callback_procedures1[] = {
	[CB_NULL] = {
		.pc_func = nfs4_callback_null,
1001
		.pc_decode = nfs4_decode_void,
L
Linus Torvalds 已提交
1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019
		.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,
1020
	.vs_hidden = true,
1021
	.vs_need_cong_ctrl = true,
L
Linus Torvalds 已提交
1022 1023
};

1024 1025 1026 1027 1028 1029
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,
1030
	.vs_hidden = true,
1031
	.vs_need_cong_ctrl = true,
1032
};