5.10-stable review patch. If anyone has any objections, please let me know.
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From: Chuck Lever chuck.lever@oracle.com
[ Upstream commit a6a63ca5652ea05637ecfe349f9e895031529556 ]
Add a .h file containing xdr_stream-based XDR helpers common to both NLMv3 and NLMv4.
Signed-off-by: Chuck Lever chuck.lever@oracle.com Signed-off-by: J. Bruce Fields bfields@redhat.com Signed-off-by: Chuck Lever chuck.lever@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/lockd/svcxdr.h | 151 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 151 insertions(+) create mode 100644 fs/lockd/svcxdr.h
diff --git a/fs/lockd/svcxdr.h b/fs/lockd/svcxdr.h new file mode 100644 index 0000000000000..c69a0bb76c940 --- /dev/null +++ b/fs/lockd/svcxdr.h @@ -0,0 +1,151 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Encode/decode NLM basic data types + * + * Basic NLMv3 XDR data types are not defined in an IETF standards + * document. X/Open has a description of these data types that + * is useful. See Chapter 10 of "Protocols for Interworking: + * XNFS, Version 3W". + * + * Basic NLMv4 XDR data types are defined in Appendix II.1.4 of + * RFC 1813: "NFS Version 3 Protocol Specification". + * + * Author: Chuck Lever chuck.lever@oracle.com + * + * Copyright (c) 2020, Oracle and/or its affiliates. + */ + +#ifndef _LOCKD_SVCXDR_H_ +#define _LOCKD_SVCXDR_H_ + +static inline bool +svcxdr_decode_stats(struct xdr_stream *xdr, __be32 *status) +{ + __be32 *p; + + p = xdr_inline_decode(xdr, XDR_UNIT); + if (!p) + return false; + *status = *p; + + return true; +} + +static inline bool +svcxdr_encode_stats(struct xdr_stream *xdr, __be32 status) +{ + __be32 *p; + + p = xdr_reserve_space(xdr, XDR_UNIT); + if (!p) + return false; + *p = status; + + return true; +} + +static inline bool +svcxdr_decode_string(struct xdr_stream *xdr, char **data, unsigned int *data_len) +{ + __be32 *p; + u32 len; + + if (xdr_stream_decode_u32(xdr, &len) < 0) + return false; + if (len > NLM_MAXSTRLEN) + return false; + p = xdr_inline_decode(xdr, len); + if (!p) + return false; + *data_len = len; + *data = (char *)p; + + return true; +} + +/* + * NLM cookies are defined by specification to be a variable-length + * XDR opaque no longer than 1024 bytes. However, this implementation + * limits their length to 32 bytes, and treats zero-length cookies + * specially. + */ +static inline bool +svcxdr_decode_cookie(struct xdr_stream *xdr, struct nlm_cookie *cookie) +{ + __be32 *p; + u32 len; + + if (xdr_stream_decode_u32(xdr, &len) < 0) + return false; + if (len > NLM_MAXCOOKIELEN) + return false; + if (!len) + goto out_hpux; + + p = xdr_inline_decode(xdr, len); + if (!p) + return false; + cookie->len = len; + memcpy(cookie->data, p, len); + + return true; + + /* apparently HPUX can return empty cookies */ +out_hpux: + cookie->len = 4; + memset(cookie->data, 0, 4); + return true; +} + +static inline bool +svcxdr_encode_cookie(struct xdr_stream *xdr, const struct nlm_cookie *cookie) +{ + __be32 *p; + + if (xdr_stream_encode_u32(xdr, cookie->len) < 0) + return false; + p = xdr_reserve_space(xdr, cookie->len); + if (!p) + return false; + memcpy(p, cookie->data, cookie->len); + + return true; +} + +static inline bool +svcxdr_decode_owner(struct xdr_stream *xdr, struct xdr_netobj *obj) +{ + __be32 *p; + u32 len; + + if (xdr_stream_decode_u32(xdr, &len) < 0) + return false; + if (len > XDR_MAX_NETOBJ) + return false; + p = xdr_inline_decode(xdr, len); + if (!p) + return false; + obj->len = len; + obj->data = (u8 *)p; + + return true; +} + +static inline bool +svcxdr_encode_owner(struct xdr_stream *xdr, const struct xdr_netobj *obj) +{ + unsigned int quadlen = XDR_QUADLEN(obj->len); + __be32 *p; + + if (xdr_stream_encode_u32(xdr, obj->len) < 0) + return false; + p = xdr_reserve_space(xdr, obj->len); + if (!p) + return false; + p[quadlen - 1] = 0; /* XDR pad */ + memcpy(p, obj->data, obj->len); + + return true; +} + +#endif /* _LOCKD_SVCXDR_H_ */