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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 | /* 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) { if (obj->len > XDR_MAX_NETOBJ) return false; return xdr_stream_encode_opaque(xdr, obj->data, obj->len) > 0; } #endif /* _LOCKD_SVCXDR_H_ */ |