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142 lines
2.8 KiB
142 lines
2.8 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* Encode/decode NLM basic data types |
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* |
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* Basic NLMv3 XDR data types are not defined in an IETF standards |
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* document. X/Open has a description of these data types that |
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* is useful. See Chapter 10 of "Protocols for Interworking: |
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* XNFS, Version 3W". |
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* |
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* Basic NLMv4 XDR data types are defined in Appendix II.1.4 of |
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* RFC 1813: "NFS Version 3 Protocol Specification". |
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* |
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* Author: Chuck Lever <[email protected]> |
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* |
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* Copyright (c) 2020, Oracle and/or its affiliates. |
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*/ |
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#ifndef _LOCKD_SVCXDR_H_ |
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#define _LOCKD_SVCXDR_H_ |
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static inline bool |
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svcxdr_decode_stats(struct xdr_stream *xdr, __be32 *status) |
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{ |
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__be32 *p; |
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p = xdr_inline_decode(xdr, XDR_UNIT); |
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if (!p) |
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return false; |
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*status = *p; |
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return true; |
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} |
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static inline bool |
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svcxdr_encode_stats(struct xdr_stream *xdr, __be32 status) |
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{ |
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__be32 *p; |
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p = xdr_reserve_space(xdr, XDR_UNIT); |
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if (!p) |
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return false; |
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*p = status; |
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return true; |
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} |
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static inline bool |
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svcxdr_decode_string(struct xdr_stream *xdr, char **data, unsigned int *data_len) |
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{ |
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__be32 *p; |
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u32 len; |
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if (xdr_stream_decode_u32(xdr, &len) < 0) |
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return false; |
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if (len > NLM_MAXSTRLEN) |
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return false; |
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p = xdr_inline_decode(xdr, len); |
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if (!p) |
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return false; |
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*data_len = len; |
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*data = (char *)p; |
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return true; |
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} |
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/* |
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* NLM cookies are defined by specification to be a variable-length |
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* XDR opaque no longer than 1024 bytes. However, this implementation |
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* limits their length to 32 bytes, and treats zero-length cookies |
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* specially. |
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*/ |
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static inline bool |
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svcxdr_decode_cookie(struct xdr_stream *xdr, struct nlm_cookie *cookie) |
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{ |
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__be32 *p; |
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u32 len; |
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if (xdr_stream_decode_u32(xdr, &len) < 0) |
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return false; |
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if (len > NLM_MAXCOOKIELEN) |
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return false; |
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if (!len) |
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goto out_hpux; |
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p = xdr_inline_decode(xdr, len); |
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if (!p) |
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return false; |
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cookie->len = len; |
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memcpy(cookie->data, p, len); |
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return true; |
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/* apparently HPUX can return empty cookies */ |
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out_hpux: |
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cookie->len = 4; |
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memset(cookie->data, 0, 4); |
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return true; |
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} |
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static inline bool |
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svcxdr_encode_cookie(struct xdr_stream *xdr, const struct nlm_cookie *cookie) |
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{ |
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__be32 *p; |
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if (xdr_stream_encode_u32(xdr, cookie->len) < 0) |
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return false; |
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p = xdr_reserve_space(xdr, cookie->len); |
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if (!p) |
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return false; |
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memcpy(p, cookie->data, cookie->len); |
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return true; |
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} |
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static inline bool |
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svcxdr_decode_owner(struct xdr_stream *xdr, struct xdr_netobj *obj) |
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{ |
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__be32 *p; |
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u32 len; |
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if (xdr_stream_decode_u32(xdr, &len) < 0) |
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return false; |
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if (len > XDR_MAX_NETOBJ) |
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return false; |
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p = xdr_inline_decode(xdr, len); |
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if (!p) |
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return false; |
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obj->len = len; |
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obj->data = (u8 *)p; |
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return true; |
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} |
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static inline bool |
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svcxdr_encode_owner(struct xdr_stream *xdr, const struct xdr_netobj *obj) |
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{ |
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if (obj->len > XDR_MAX_NETOBJ) |
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return false; |
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return xdr_stream_encode_opaque(xdr, obj->data, obj->len) > 0; |
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} |
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#endif /* _LOCKD_SVCXDR_H_ */
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