From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNWANTED_LANGUAGE_BODY autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BE392C47082 for ; Thu, 3 Jun 2021 20:50:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9EAA8613E7 for ; Thu, 3 Jun 2021 20:50:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229894AbhFCUwi (ORCPT ); Thu, 3 Jun 2021 16:52:38 -0400 Received: from mail.kernel.org ([198.145.29.99]:44598 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229576AbhFCUwi (ORCPT ); Thu, 3 Jun 2021 16:52:38 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id D90F2613E7; Thu, 3 Jun 2021 20:50:52 +0000 (UTC) Subject: [PATCH 03/29] lockd: Common NLM XDR helpers From: Chuck Lever To: bfields@fieldses.org Cc: linux-nfs@vger.kernel.org Date: Thu, 03 Jun 2021 16:50:52 -0400 Message-ID: <162275345217.32691.12086548088820348898.stgit@klimt.1015granger.net> In-Reply-To: <162275337584.32691.3943139351165347555.stgit@klimt.1015granger.net> References: <162275337584.32691.3943139351165347555.stgit@klimt.1015granger.net> User-Agent: StGit/1.1 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org Add a .h file containing xdr_stream-based XDR helpers common to both NLMv3 and NLMv4. Signed-off-by: Chuck Lever --- 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 000000000000..c69a0bb76c94 --- /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 + * + * 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_ */