1099 lines
27 KiB
C
1099 lines
27 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/nfs/callback_xdr.c
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*
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* Copyright (C) 2004 Trond Myklebust
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*
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* NFSv4 callback encode/decode procedures
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*/
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#include <linux/kernel.h>
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#include <linux/sunrpc/svc.h>
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#include <linux/nfs4.h>
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#include <linux/nfs_fs.h>
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#include <linux/ratelimit.h>
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#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)
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#define CB_OP_HDR_RES_MAXSZ (2 * 4) // opcode, status
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#define CB_OP_GETATTR_BITMAP_MAXSZ (4 * 4) // bitmap length, 3 bitmaps
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#define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
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CB_OP_GETATTR_BITMAP_MAXSZ + \
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/* change, size, ctime, mtime */\
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(2 + 2 + 3 + 3) * 4)
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#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 + \
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(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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#ifdef CONFIG_NFS_V4_2
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#define CB_OP_OFFLOAD_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
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#endif /* CONFIG_NFS_V4_2 */
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#define NFSDBG_FACILITY NFSDBG_CALLBACK
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/* Internal error code */
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#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 *);
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__be32 (*decode_args)(struct svc_rqst *, struct xdr_stream *, void *);
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__be32 (*encode_res)(struct svc_rqst *, struct xdr_stream *,
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const void *);
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long res_maxsize;
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};
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static struct callback_op callback_ops[];
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static __be32 nfs4_callback_null(struct svc_rqst *rqstp)
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{
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return htonl(NFS4_OK);
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}
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static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p)
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{
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return xdr_argsize_check(rqstp, p);
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}
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static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p)
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{
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return xdr_ressize_check(rqstp, p);
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}
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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);
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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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}
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static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len,
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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);
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if (err < 0)
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return cpu_to_be32(NFS4ERR_RESOURCE);
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*len = err;
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return 0;
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}
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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);
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if (unlikely(p == NULL))
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return htonl(NFS4ERR_RESOURCE);
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fh->size = ntohl(*p);
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if (fh->size > NFS4_FHSIZE)
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return htonl(NFS4ERR_BADHANDLE);
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p = read_buf(xdr, fh->size);
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if (unlikely(p == NULL))
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return htonl(NFS4ERR_RESOURCE);
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memcpy(&fh->data[0], p, fh->size);
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memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
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return 0;
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}
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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;
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p = read_buf(xdr, 4);
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if (unlikely(p == NULL))
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return htonl(NFS4ERR_RESOURCE);
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attrlen = ntohl(*p);
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p = read_buf(xdr, attrlen << 2);
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if (unlikely(p == NULL))
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return htonl(NFS4ERR_RESOURCE);
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if (likely(attrlen > 0))
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bitmap[0] = ntohl(*p++);
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if (attrlen > 1)
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bitmap[1] = ntohl(*p);
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return 0;
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}
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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))
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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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}
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static __be32 decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
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{
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stateid->type = NFS4_DELEGATION_STATEID_TYPE;
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return decode_stateid(xdr, stateid);
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}
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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))
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return status;
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p = read_buf(xdr, 12);
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if (unlikely(p == NULL))
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return htonl(NFS4ERR_RESOURCE);
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hdr->minorversion = ntohl(*p++);
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/* Check for minor version support */
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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",
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__func__, hdr->minorversion);
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return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
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}
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hdr->nops = ntohl(*p);
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return 0;
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}
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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);
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if (unlikely(p == NULL))
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return htonl(NFS4ERR_RESOURCE_HDR);
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*op = ntohl(*p);
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return 0;
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}
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static __be32 decode_getattr_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_getattrargs *args = argp;
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__be32 status;
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status = decode_fh(xdr, &args->fh);
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if (unlikely(status != 0))
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return status;
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return decode_bitmap(xdr, args->bitmap);
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}
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static __be32 decode_recall_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_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))
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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)
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{
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stateid->type = NFS4_LAYOUT_STATEID_TYPE;
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return decode_stateid(xdr, stateid);
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}
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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;
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__be32 status = 0;
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uint32_t iomode;
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p = read_buf(xdr, 4 * sizeof(uint32_t));
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if (unlikely(p == NULL))
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return htonl(NFS4ERR_BADXDR);
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args->cbl_layout_type = ntohl(*p++);
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/* 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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*/
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iomode = ntohl(*p++);
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args->cbl_layoutchanged = ntohl(*p++);
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args->cbl_recall_type = ntohl(*p++);
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if (args->cbl_recall_type == RETURN_FILE) {
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args->cbl_range.iomode = iomode;
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status = decode_fh(xdr, &args->cbl_fh);
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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))
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return htonl(NFS4ERR_BADXDR);
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p = xdr_decode_hyper(p, &args->cbl_range.offset);
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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) {
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p = read_buf(xdr, 2 * sizeof(uint64_t));
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if (unlikely(p == NULL))
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return htonl(NFS4ERR_BADXDR);
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p = xdr_decode_hyper(p, &args->cbl_fsid.major);
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p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
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} else if (args->cbl_recall_type != RETURN_ALL)
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return htonl(NFS4ERR_BADXDR);
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return 0;
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}
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static
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__be32 decode_devicenotify_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_devicenotifyargs *args = argp;
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__be32 *p;
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__be32 status = 0;
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u32 tmp;
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int n, i;
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args->ndevs = 0;
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/* Num of device notifications */
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p = read_buf(xdr, sizeof(uint32_t));
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if (unlikely(p == NULL)) {
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status = htonl(NFS4ERR_BADXDR);
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goto out;
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}
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n = ntohl(*p++);
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if (n <= 0)
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goto out;
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if (n > ULONG_MAX / sizeof(*args->devs)) {
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status = htonl(NFS4ERR_BADXDR);
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goto out;
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}
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args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL);
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if (!args->devs) {
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status = htonl(NFS4ERR_DELAY);
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goto out;
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}
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/* Decode each dev notification */
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for (i = 0; i < n; i++) {
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struct cb_devicenotifyitem *dev = &args->devs[i];
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p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE);
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if (unlikely(p == NULL)) {
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status = htonl(NFS4ERR_BADXDR);
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goto err;
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}
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tmp = ntohl(*p++); /* bitmap size */
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if (tmp != 1) {
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status = htonl(NFS4ERR_INVAL);
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goto err;
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}
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dev->cbd_notify_type = ntohl(*p++);
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if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
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dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
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status = htonl(NFS4ERR_INVAL);
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goto err;
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}
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tmp = ntohl(*p++); /* opaque size */
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if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
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(tmp != NFS4_DEVICEID4_SIZE + 8)) ||
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((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
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(tmp != NFS4_DEVICEID4_SIZE + 4))) {
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status = htonl(NFS4ERR_INVAL);
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goto err;
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}
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dev->cbd_layout_type = ntohl(*p++);
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memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
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p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
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if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
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p = read_buf(xdr, sizeof(uint32_t));
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if (unlikely(p == NULL)) {
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status = htonl(NFS4ERR_BADXDR);
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goto err;
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}
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dev->cbd_immediate = ntohl(*p++);
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} else {
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dev->cbd_immediate = 0;
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}
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args->ndevs++;
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dprintk("%s: type %d layout 0x%x immediate %d\n",
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__func__, dev->cbd_notify_type, dev->cbd_layout_type,
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dev->cbd_immediate);
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}
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out:
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dprintk("%s: status %d ndevs %d\n",
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__func__, ntohl(status), args->ndevs);
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return status;
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err:
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kfree(args->devs);
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goto out;
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}
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static __be32 decode_sessionid(struct xdr_stream *xdr,
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struct nfs4_sessionid *sid)
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{
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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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}
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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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{
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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);
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if (status)
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goto out;
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status = htonl(NFS4ERR_RESOURCE);
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p = read_buf(xdr, sizeof(uint32_t));
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if (unlikely(p == NULL))
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goto out;
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rc_list->rcl_nrefcalls = ntohl(*p++);
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if (rc_list->rcl_nrefcalls) {
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p = read_buf(xdr,
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rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
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if (unlikely(p == NULL))
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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),
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GFP_KERNEL);
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if (unlikely(rc_list->rcl_refcalls == NULL))
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goto out;
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for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
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rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
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rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
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}
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}
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status = 0;
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out:
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return status;
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}
|
|
|
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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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|
|
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status = decode_sessionid(xdr, &args->csa_sessionid);
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if (status)
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return status;
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|
|
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p = read_buf(xdr, 5 * sizeof(uint32_t));
|
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if (unlikely(p == NULL))
|
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return htonl(NFS4ERR_RESOURCE);
|
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|
|
args->csa_addr = svc_addr(rqstp);
|
|
args->csa_sequenceid = ntohl(*p++);
|
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args->csa_slotid = ntohl(*p++);
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args->csa_highestslotid = ntohl(*p++);
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|
args->csa_cachethis = ntohl(*p++);
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args->csa_nrclists = ntohl(*p++);
|
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args->csa_rclists = NULL;
|
|
if (args->csa_nrclists) {
|
|
args->csa_rclists = kmalloc_array(args->csa_nrclists,
|
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sizeof(*args->csa_rclists),
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GFP_KERNEL);
|
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if (unlikely(args->csa_rclists == NULL))
|
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return htonl(NFS4ERR_RESOURCE);
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|
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for (i = 0; i < args->csa_nrclists; i++) {
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status = decode_rc_list(xdr, &args->csa_rclists[i]);
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if (status) {
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args->csa_nrclists = i;
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goto out_free;
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}
|
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}
|
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}
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return 0;
|
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|
|
out_free:
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for (i = 0; i < args->csa_nrclists; i++)
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kfree(args->csa_rclists[i].rcl_refcalls);
|
|
kfree(args->csa_rclists);
|
|
return status;
|
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}
|
|
|
|
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;
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|
|
|
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 */
|
|
#ifdef CONFIG_NFS_V4_2
|
|
static __be32 decode_write_response(struct xdr_stream *xdr,
|
|
struct cb_offloadargs *args)
|
|
{
|
|
__be32 *p;
|
|
|
|
/* skip the always zero field */
|
|
p = read_buf(xdr, 4);
|
|
if (unlikely(!p))
|
|
goto out;
|
|
p++;
|
|
|
|
/* decode count, stable_how, verifier */
|
|
p = xdr_inline_decode(xdr, 8 + 4);
|
|
if (unlikely(!p))
|
|
goto out;
|
|
p = xdr_decode_hyper(p, &args->wr_count);
|
|
args->wr_writeverf.committed = be32_to_cpup(p);
|
|
p = xdr_inline_decode(xdr, NFS4_VERIFIER_SIZE);
|
|
if (likely(p)) {
|
|
memcpy(&args->wr_writeverf.verifier.data[0], p,
|
|
NFS4_VERIFIER_SIZE);
|
|
return 0;
|
|
}
|
|
out:
|
|
return htonl(NFS4ERR_RESOURCE);
|
|
}
|
|
|
|
static __be32 decode_offload_args(struct svc_rqst *rqstp,
|
|
struct xdr_stream *xdr,
|
|
void *data)
|
|
{
|
|
struct cb_offloadargs *args = data;
|
|
__be32 *p;
|
|
__be32 status;
|
|
|
|
/* decode fh */
|
|
status = decode_fh(xdr, &args->coa_fh);
|
|
if (unlikely(status != 0))
|
|
return status;
|
|
|
|
/* decode stateid */
|
|
status = decode_stateid(xdr, &args->coa_stateid);
|
|
if (unlikely(status != 0))
|
|
return status;
|
|
|
|
/* decode status */
|
|
p = read_buf(xdr, 4);
|
|
if (unlikely(!p))
|
|
goto out;
|
|
args->error = ntohl(*p++);
|
|
if (!args->error) {
|
|
status = decode_write_response(xdr, args);
|
|
if (unlikely(status != 0))
|
|
return status;
|
|
} else {
|
|
p = xdr_inline_decode(xdr, 8);
|
|
if (unlikely(!p))
|
|
goto out;
|
|
p = xdr_decode_hyper(p, &args->wr_count);
|
|
}
|
|
return 0;
|
|
out:
|
|
return htonl(NFS4ERR_RESOURCE);
|
|
}
|
|
#endif /* CONFIG_NFS_V4_2 */
|
|
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;
|
|
}
|
|
|
|
static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, size_t sz)
|
|
{
|
|
if (xdr_stream_encode_uint32_array(xdr, bitmap, sz) < 0)
|
|
return cpu_to_be32(NFS4ERR_RESOURCE);
|
|
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, ARRAY_SIZE(res->bitmap));
|
|
if (unlikely(status != 0))
|
|
goto out;
|
|
status = cpu_to_be32(NFS4ERR_RESOURCE);
|
|
savep = xdr_reserve_space(xdr, sizeof(*savep));
|
|
if (unlikely(!savep))
|
|
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);
|
|
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) {
|
|
*op = &callback_ops[op_nr];
|
|
return htonl(NFS_OK);
|
|
} else
|
|
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)) {
|
|
if (cps.clp)
|
|
nfs_put_client(cps.clp);
|
|
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) {
|
|
if (cps.clp)
|
|
nfs_put_client(cps.clp);
|
|
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 */
|
|
#ifdef CONFIG_NFS_V4_2
|
|
[OP_CB_OFFLOAD] = {
|
|
.process_op = nfs4_callback_offload,
|
|
.decode_args = decode_offload_args,
|
|
.res_maxsize = CB_OP_OFFLOAD_RES_MAXSZ,
|
|
},
|
|
#endif /* CONFIG_NFS_V4_2 */
|
|
};
|
|
|
|
/*
|
|
* Define NFS4 callback procedures
|
|
*/
|
|
static const struct svc_procedure nfs4_callback_procedures1[] = {
|
|
[CB_NULL] = {
|
|
.pc_func = nfs4_callback_null,
|
|
.pc_decode = nfs4_decode_void,
|
|
.pc_encode = nfs4_encode_void,
|
|
.pc_xdrressize = 1,
|
|
},
|
|
[CB_COMPOUND] = {
|
|
.pc_func = nfs4_callback_compound,
|
|
.pc_encode = nfs4_encode_void,
|
|
.pc_argsize = 256,
|
|
.pc_ressize = 256,
|
|
.pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
|
|
}
|
|
};
|
|
|
|
static unsigned int nfs4_callback_count1[ARRAY_SIZE(nfs4_callback_procedures1)];
|
|
const struct svc_version nfs4_callback_version1 = {
|
|
.vs_vers = 1,
|
|
.vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
|
|
.vs_proc = nfs4_callback_procedures1,
|
|
.vs_count = nfs4_callback_count1,
|
|
.vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
|
|
.vs_dispatch = NULL,
|
|
.vs_hidden = true,
|
|
.vs_need_cong_ctrl = true,
|
|
};
|
|
|
|
static unsigned int nfs4_callback_count4[ARRAY_SIZE(nfs4_callback_procedures1)];
|
|
const struct svc_version nfs4_callback_version4 = {
|
|
.vs_vers = 4,
|
|
.vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
|
|
.vs_proc = nfs4_callback_procedures1,
|
|
.vs_count = nfs4_callback_count4,
|
|
.vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
|
|
.vs_dispatch = NULL,
|
|
.vs_hidden = true,
|
|
.vs_need_cong_ctrl = true,
|
|
};
|