NFSD: Update XDR decoders in NFSv4 callback client
Clean up. Remove old-style NFSv4 XDR macros in favor of the style now used in fs/nfs/nfs4xdr.c. These were forgotten during the recent nfs4xdr.c rewrite. Additional whitespace cleanup adds to the size of this patch. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Tested-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever
Trond Myklebust
parent
a033db487e
commit
85a5648019
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@ -74,37 +74,6 @@ enum {
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cb_sequence_dec_sz + \
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op_dec_sz)
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/*
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* Generic decode routines from fs/nfs/nfs4xdr.c
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*/
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#define DECODE_TAIL \
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status = 0; \
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out: \
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return status; \
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xdr_error: \
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dprintk("NFSD: xdr error! (%s:%d)\n", __FILE__, __LINE__); \
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status = -EIO; \
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goto out
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#define READ32(x) (x) = ntohl(*p++)
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#define READ64(x) do { \
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(x) = (u64)ntohl(*p++) << 32; \
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(x) |= ntohl(*p++); \
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} while (0)
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#define READTIME(x) do { \
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p++; \
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(x.tv_sec) = ntohl(*p++); \
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(x.tv_nsec) = ntohl(*p++); \
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} while (0)
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#define READ_BUF(nbytes) do { \
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p = xdr_inline_decode(xdr, nbytes); \
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if (!p) { \
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dprintk("NFSD: %s: reply buffer overflowed in line %d.\n", \
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__func__, __LINE__); \
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return -EIO; \
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} \
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} while (0)
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struct nfs4_cb_compound_hdr {
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/* args */
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u32 ident; /* minorversion 0 only */
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@ -115,57 +84,14 @@ struct nfs4_cb_compound_hdr {
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int status;
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};
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static struct {
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int stat;
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int errno;
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} nfs_cb_errtbl[] = {
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{ NFS4_OK, 0 },
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{ NFS4ERR_PERM, EPERM },
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{ NFS4ERR_NOENT, ENOENT },
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{ NFS4ERR_IO, EIO },
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{ NFS4ERR_NXIO, ENXIO },
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{ NFS4ERR_ACCESS, EACCES },
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{ NFS4ERR_EXIST, EEXIST },
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{ NFS4ERR_XDEV, EXDEV },
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{ NFS4ERR_NOTDIR, ENOTDIR },
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{ NFS4ERR_ISDIR, EISDIR },
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{ NFS4ERR_INVAL, EINVAL },
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{ NFS4ERR_FBIG, EFBIG },
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{ NFS4ERR_NOSPC, ENOSPC },
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{ NFS4ERR_ROFS, EROFS },
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{ NFS4ERR_MLINK, EMLINK },
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{ NFS4ERR_NAMETOOLONG, ENAMETOOLONG },
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{ NFS4ERR_NOTEMPTY, ENOTEMPTY },
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{ NFS4ERR_DQUOT, EDQUOT },
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{ NFS4ERR_STALE, ESTALE },
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{ NFS4ERR_BADHANDLE, EBADHANDLE },
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{ NFS4ERR_BAD_COOKIE, EBADCOOKIE },
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{ NFS4ERR_NOTSUPP, ENOTSUPP },
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{ NFS4ERR_TOOSMALL, ETOOSMALL },
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{ NFS4ERR_SERVERFAULT, ESERVERFAULT },
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{ NFS4ERR_BADTYPE, EBADTYPE },
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{ NFS4ERR_LOCKED, EAGAIN },
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{ NFS4ERR_RESOURCE, EREMOTEIO },
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{ NFS4ERR_SYMLINK, ELOOP },
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{ NFS4ERR_OP_ILLEGAL, EOPNOTSUPP },
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{ NFS4ERR_DEADLOCK, EDEADLK },
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{ -1, EIO }
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};
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static int
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nfs_cb_stat_to_errno(int stat)
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/*
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* Handle decode buffer overflows out-of-line.
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*/
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static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
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{
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int i;
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for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) {
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if (nfs_cb_errtbl[i].stat == stat)
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return nfs_cb_errtbl[i].errno;
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}
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/* If we cannot translate the error, the recovery routines should
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* handle it.
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* Note: remaining NFSv4 error codes have values > 10000, so should
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* not conflict with native Linux error codes.
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*/
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return stat;
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dprintk("NFS: %s prematurely hit the end of our receive buffer. "
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"Remaining buffer length is %tu words.\n",
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func, xdr->end - xdr->p);
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}
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static __be32 *xdr_encode_empty_array(__be32 *p)
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@ -262,6 +188,89 @@ static void encode_sessionid4(struct xdr_stream *xdr,
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NFS4_MAX_SESSIONID_LEN);
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}
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/*
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* nfsstat4
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*/
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static const struct {
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int stat;
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int errno;
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} nfs_cb_errtbl[] = {
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{ NFS4_OK, 0 },
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{ NFS4ERR_PERM, -EPERM },
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{ NFS4ERR_NOENT, -ENOENT },
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{ NFS4ERR_IO, -EIO },
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{ NFS4ERR_NXIO, -ENXIO },
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{ NFS4ERR_ACCESS, -EACCES },
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{ NFS4ERR_EXIST, -EEXIST },
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{ NFS4ERR_XDEV, -EXDEV },
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{ NFS4ERR_NOTDIR, -ENOTDIR },
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{ NFS4ERR_ISDIR, -EISDIR },
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{ NFS4ERR_INVAL, -EINVAL },
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{ NFS4ERR_FBIG, -EFBIG },
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{ NFS4ERR_NOSPC, -ENOSPC },
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{ NFS4ERR_ROFS, -EROFS },
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{ NFS4ERR_MLINK, -EMLINK },
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{ NFS4ERR_NAMETOOLONG, -ENAMETOOLONG },
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{ NFS4ERR_NOTEMPTY, -ENOTEMPTY },
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{ NFS4ERR_DQUOT, -EDQUOT },
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{ NFS4ERR_STALE, -ESTALE },
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{ NFS4ERR_BADHANDLE, -EBADHANDLE },
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{ NFS4ERR_BAD_COOKIE, -EBADCOOKIE },
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{ NFS4ERR_NOTSUPP, -ENOTSUPP },
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{ NFS4ERR_TOOSMALL, -ETOOSMALL },
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{ NFS4ERR_SERVERFAULT, -ESERVERFAULT },
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{ NFS4ERR_BADTYPE, -EBADTYPE },
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{ NFS4ERR_LOCKED, -EAGAIN },
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{ NFS4ERR_RESOURCE, -EREMOTEIO },
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{ NFS4ERR_SYMLINK, -ELOOP },
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{ NFS4ERR_OP_ILLEGAL, -EOPNOTSUPP },
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{ NFS4ERR_DEADLOCK, -EDEADLK },
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{ -1, -EIO }
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};
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/*
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* If we cannot translate the error, the recovery routines should
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* handle it.
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*
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* Note: remaining NFSv4 error codes have values > 10000, so should
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* not conflict with native Linux error codes.
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*/
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static int nfs_cb_stat_to_errno(int status)
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{
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int i;
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for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) {
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if (nfs_cb_errtbl[i].stat == status)
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return nfs_cb_errtbl[i].errno;
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}
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dprintk("NFSD: Unrecognized NFS CB status value: %u\n", status);
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return -status;
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}
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static int decode_cb_op_status(struct xdr_stream *xdr, enum nfs_opnum4 expected,
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enum nfsstat4 *status)
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{
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__be32 *p;
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u32 op;
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p = xdr_inline_decode(xdr, 4 + 4);
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if (unlikely(p == NULL))
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goto out_overflow;
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op = be32_to_cpup(p++);
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if (unlikely(op != expected))
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goto out_unexpected;
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*status = be32_to_cpup(p);
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return 0;
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out_overflow:
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print_overflow_msg(__func__, xdr);
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return -EIO;
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out_unexpected:
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dprintk("NFSD: Callback server returned operation %d but "
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"we issued a request for %d\n", op, expected);
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return -EIO;
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}
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/*
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* CB_COMPOUND4args
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*
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@ -295,6 +304,37 @@ static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr)
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*hdr->nops_p = cpu_to_be32(hdr->nops);
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}
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/*
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* CB_COMPOUND4res
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*
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* struct CB_COMPOUND4res {
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* nfsstat4 status;
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* utf8str_cs tag;
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* nfs_cb_resop4 resarray<>;
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* };
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*/
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static int decode_cb_compound4res(struct xdr_stream *xdr,
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struct nfs4_cb_compound_hdr *hdr)
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{
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u32 length;
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__be32 *p;
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p = xdr_inline_decode(xdr, 4 + 4);
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if (unlikely(p == NULL))
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goto out_overflow;
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hdr->status = be32_to_cpup(p++);
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/* Ignore the tag */
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length = be32_to_cpup(p++);
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p = xdr_inline_decode(xdr, length + 4);
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if (unlikely(p == NULL))
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goto out_overflow;
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hdr->nops = be32_to_cpup(p);
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return 0;
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out_overflow:
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print_overflow_msg(__func__, xdr);
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return -EIO;
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}
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/*
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* CB_RECALL4args
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*
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@ -356,6 +396,97 @@ static void encode_cb_sequence4args(struct xdr_stream *xdr,
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hdr->nops++;
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}
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/*
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* CB_SEQUENCE4resok
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*
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* struct CB_SEQUENCE4resok {
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* sessionid4 csr_sessionid;
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* sequenceid4 csr_sequenceid;
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* slotid4 csr_slotid;
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* slotid4 csr_highest_slotid;
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* slotid4 csr_target_highest_slotid;
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* };
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*
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* union CB_SEQUENCE4res switch (nfsstat4 csr_status) {
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* case NFS4_OK:
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* CB_SEQUENCE4resok csr_resok4;
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* default:
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* void;
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* };
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*
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* Our current back channel implmentation supports a single backchannel
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* with a single slot.
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*/
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static int decode_cb_sequence4resok(struct xdr_stream *xdr,
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struct nfsd4_callback *cb)
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{
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struct nfsd4_session *session = cb->cb_clp->cl_cb_session;
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struct nfs4_sessionid id;
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int status;
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__be32 *p;
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u32 dummy;
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status = -ESERVERFAULT;
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/*
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* If the server returns different values for sessionID, slotID or
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* sequence number, the server is looney tunes.
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*/
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p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN + 4 + 4);
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if (unlikely(p == NULL))
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goto out_overflow;
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memcpy(id.data, p, NFS4_MAX_SESSIONID_LEN);
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if (memcmp(id.data, session->se_sessionid.data,
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NFS4_MAX_SESSIONID_LEN) != 0) {
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dprintk("NFS: %s Invalid session id\n", __func__);
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goto out;
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}
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p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN);
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dummy = be32_to_cpup(p++);
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if (dummy != session->se_cb_seq_nr) {
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dprintk("NFS: %s Invalid sequence number\n", __func__);
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goto out;
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}
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dummy = be32_to_cpup(p++);
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if (dummy != 0) {
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dprintk("NFS: %s Invalid slotid\n", __func__);
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goto out;
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}
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/*
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* FIXME: process highest slotid and target highest slotid
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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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out_overflow:
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print_overflow_msg(__func__, xdr);
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return -EIO;
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}
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static int decode_cb_sequence4res(struct xdr_stream *xdr,
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struct nfsd4_callback *cb)
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{
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enum nfsstat4 nfserr;
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int status;
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if (cb->cb_minorversion == 0)
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return 0;
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status = decode_cb_op_status(xdr, OP_CB_SEQUENCE, &nfserr);
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if (unlikely(status))
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goto out;
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if (unlikely(nfserr != NFS4_OK))
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goto out_default;
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status = decode_cb_sequence4resok(xdr, cb);
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out:
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return status;
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out_default:
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return nfs_cb_stat_to_errno(status);
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}
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/*
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* NFSv4.0 and NFSv4.1 XDR encode functions
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*
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@ -399,119 +530,51 @@ static int nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p,
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}
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static int
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decode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr){
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__be32 *p;
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u32 taglen;
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/*
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* NFSv4.0 and NFSv4.1 XDR decode functions
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*
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* NFSv4.0 callback result types are defined in section 15 of RFC
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* 3530: "Network File System (NFS) version 4 Protocol" and section 20
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* of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1
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* Protocol".
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*/
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READ_BUF(8);
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READ32(hdr->status);
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/* We've got no use for the tag; ignore it: */
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READ32(taglen);
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READ_BUF(taglen + 4);
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p += XDR_QUADLEN(taglen);
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READ32(hdr->nops);
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return 0;
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}
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static int
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decode_cb_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
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static int nfs4_xdr_dec_cb_null(struct rpc_rqst *req, __be32 *p, void *__unused)
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{
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__be32 *p;
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u32 op;
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int32_t nfserr;
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READ_BUF(8);
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READ32(op);
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if (op != expected) {
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dprintk("NFSD: decode_cb_op_hdr: Callback server returned "
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" operation %d but we issued a request for %d\n",
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op, expected);
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return -EIO;
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}
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READ32(nfserr);
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if (nfserr != NFS_OK)
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return -nfs_cb_stat_to_errno(nfserr);
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return 0;
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}
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/*
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* Our current back channel implmentation supports a single backchannel
|
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* with a single slot.
|
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* 20.2. Operation 4: CB_RECALL - Recall a Delegation
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*/
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static int
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decode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_callback *cb,
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struct rpc_rqst *rqstp)
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{
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struct nfsd4_session *ses = cb->cb_clp->cl_cb_session;
|
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struct nfs4_sessionid id;
|
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int status;
|
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u32 dummy;
|
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__be32 *p;
|
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|
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if (cb->cb_minorversion == 0)
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return 0;
|
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|
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status = decode_cb_op_hdr(xdr, OP_CB_SEQUENCE);
|
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if (status)
|
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return status;
|
||||
|
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/*
|
||||
* If the server returns different values for sessionID, slotID or
|
||||
* sequence number, the server is looney tunes.
|
||||
*/
|
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status = -ESERVERFAULT;
|
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|
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READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
|
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memcpy(id.data, p, NFS4_MAX_SESSIONID_LEN);
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p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN);
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if (memcmp(id.data, ses->se_sessionid.data, NFS4_MAX_SESSIONID_LEN)) {
|
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dprintk("%s Invalid session id\n", __func__);
|
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goto out;
|
||||
}
|
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READ32(dummy);
|
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if (dummy != ses->se_cb_seq_nr) {
|
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dprintk("%s Invalid sequence number\n", __func__);
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goto out;
|
||||
}
|
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READ32(dummy); /* slotid must be 0 */
|
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if (dummy != 0) {
|
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dprintk("%s Invalid slotid\n", __func__);
|
||||
goto out;
|
||||
}
|
||||
/* FIXME: process highest slotid and target highest slotid */
|
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status = 0;
|
||||
out:
|
||||
return status;
|
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}
|
||||
|
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|
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static int
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nfs4_xdr_dec_cb_null(struct rpc_rqst *req, __be32 *p)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
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static int
|
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nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p,
|
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struct nfsd4_callback *cb)
|
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static int nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p,
|
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struct nfsd4_callback *cb)
|
||||
{
|
||||
struct xdr_stream xdr;
|
||||
struct nfs4_cb_compound_hdr hdr;
|
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enum nfsstat4 nfserr;
|
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int status;
|
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|
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xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
|
||||
status = decode_cb_compound_hdr(&xdr, &hdr);
|
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if (status)
|
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status = decode_cb_compound4res(&xdr, &hdr);
|
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if (unlikely(status))
|
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goto out;
|
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if (cb) {
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status = decode_cb_sequence(&xdr, cb, rqstp);
|
||||
if (status)
|
||||
|
||||
if (cb != NULL) {
|
||||
status = decode_cb_sequence4res(&xdr, cb);
|
||||
if (unlikely(status))
|
||||
goto out;
|
||||
}
|
||||
status = decode_cb_op_hdr(&xdr, OP_CB_RECALL);
|
||||
|
||||
status = decode_cb_op_status(&xdr, OP_CB_RECALL, &nfserr);
|
||||
if (unlikely(status))
|
||||
goto out;
|
||||
if (unlikely(nfserr != NFS4_OK))
|
||||
goto out_default;
|
||||
out:
|
||||
return status;
|
||||
out_default:
|
||||
return nfs_cb_stat_to_errno(status);
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
|
|||
Reference in New Issue