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1097 lines
27 KiB
1097 lines
27 KiB
// 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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#include "nfs4trace.h" |
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|
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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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|
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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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|
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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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|
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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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|
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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 = xdr_inline_decode(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 = xdr_inline_decode(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 = xdr_inline_decode(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 = xdr_inline_decode(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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|
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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 = xdr_inline_decode(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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|
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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 = xdr_inline_decode(xdr, 12); |
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if (unlikely(p == NULL)) |
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return htonl(NFS4ERR_RESOURCE); |
|
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 = xdr_inline_decode(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 = xdr_inline_decode(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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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; |
|
__be32 *p; |
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__be32 status = 0; |
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uint32_t iomode; |
|
|
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p = xdr_inline_decode(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 = xdr_inline_decode(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 = xdr_inline_decode(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 = xdr_inline_decode(xdr, sizeof(uint32_t)); |
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if (unlikely(p == NULL)) { |
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status = htonl(NFS4ERR_BADXDR); |
|
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); |
|
goto out; |
|
} |
|
|
|
/* 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 = xdr_inline_decode(xdr, (4 * sizeof(uint32_t)) + |
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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); |
|
goto err; |
|
} |
|
dev->cbd_notify_type = ntohl(*p++); |
|
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); |
|
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 = xdr_inline_decode(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 = xdr_inline_decode(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 = xdr_inline_decode(xdr, sizeof(uint32_t)); |
|
if (unlikely(p == NULL)) |
|
goto out; |
|
|
|
rc_list->rcl_nrefcalls = ntohl(*p++); |
|
if (rc_list->rcl_nrefcalls) { |
|
p = xdr_inline_decode(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 = xdr_inline_decode(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 = xdr_inline_decode(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 = xdr_inline_decode(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 = xdr_inline_decode(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 = xdr_inline_decode(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 = xdr_inline_decode(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 = xdr_inline_decode(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 timespec64 *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 timespec64 *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 timespec64 *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, NULL); |
|
|
|
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, NULL); |
|
|
|
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) { |
|
trace_nfs_cb_no_clp(rqstp->rq_xid, hdr_arg.cb_ident); |
|
goto out_invalidcred; |
|
} |
|
if (!check_gss_callback_principal(cps.clp, rqstp)) { |
|
trace_nfs_cb_badprinc(rqstp->rq_xid, hdr_arg.cb_ident); |
|
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 svc_return_autherr(rqstp, 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[] = { |
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[CB_NULL] = { |
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.pc_func = nfs4_callback_null, |
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.pc_decode = nfs4_decode_void, |
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.pc_encode = nfs4_encode_void, |
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.pc_xdrressize = 1, |
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.pc_name = "NULL", |
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}, |
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[CB_COMPOUND] = { |
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.pc_func = nfs4_callback_compound, |
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.pc_encode = nfs4_encode_void, |
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.pc_argsize = 256, |
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.pc_ressize = 256, |
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.pc_xdrressize = NFS4_CALLBACK_BUFSIZE, |
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.pc_name = "COMPOUND", |
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} |
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}; |
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|
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static unsigned int nfs4_callback_count1[ARRAY_SIZE(nfs4_callback_procedures1)]; |
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const struct svc_version nfs4_callback_version1 = { |
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.vs_vers = 1, |
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.vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), |
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.vs_proc = nfs4_callback_procedures1, |
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.vs_count = nfs4_callback_count1, |
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.vs_xdrsize = NFS4_CALLBACK_XDRSIZE, |
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.vs_dispatch = NULL, |
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.vs_hidden = true, |
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.vs_need_cong_ctrl = true, |
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}; |
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|
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static unsigned int nfs4_callback_count4[ARRAY_SIZE(nfs4_callback_procedures1)]; |
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const struct svc_version nfs4_callback_version4 = { |
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.vs_vers = 4, |
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.vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), |
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.vs_proc = nfs4_callback_procedures1, |
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.vs_count = nfs4_callback_count4, |
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.vs_xdrsize = NFS4_CALLBACK_XDRSIZE, |
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.vs_dispatch = NULL, |
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.vs_hidden = true, |
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.vs_need_cong_ctrl = true, |
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};
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