From patchwork Wed Jun 7 13:58:49 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chuck Lever X-Patchwork-Id: 13270733 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E4616C77B7A for ; Wed, 7 Jun 2023 13:59:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235026AbjFGN7D (ORCPT ); Wed, 7 Jun 2023 09:59:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37690 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240248AbjFGN7C (ORCPT ); Wed, 7 Jun 2023 09:59:02 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8B10B1BD9 for ; Wed, 7 Jun 2023 06:59:01 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 27A3A637D9 for ; Wed, 7 Jun 2023 13:59:01 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 259B0C433D2; Wed, 7 Jun 2023 13:59:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1686146340; bh=LMHuRd5WPLT8qIpWgE1SH25bjVB8IUFgTNdqEunPsTo=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=VqYUgFrqvJQjJWEgxxG4JOMQweqIuIPI0bgbao4iTn5SlqO27X8AJ41nOdFGAUHIU ewqSi28RL6XN7Ngw11hiJH6/iZYgkU0rKrZ2hwIJGT1bR8Y5biyRqs+DZgO96AutQp WGr/eR4fwo2pI202rrbJFyGcf6s2/4SNKVDUjY5m0Aezqks+g9ZUZPuJNaYkC/0SaD uNas7bZUJbvC/ttAkO9QnmEq/Oo9SxBauv2JLCkxLxRqliDgUX98rMUH7cY98I1iIR JQ/5IoNs7lC2k8amxJAN+5AYsINn5+kWSX8iUl2gXr+4ug7CsxaIdziQMGT9XXNofl 2MwLN6GvUfYHg== Subject: [PATCH v4 6/9] SUNRPC: Capture CMSG metadata on client-side receive From: Chuck Lever To: anna.schumaker@netapp.com, trondmy@hammerspace.com Cc: Chuck Lever , Jeff Layton , linux-nfs@vger.kernel.org, kernel-tls-handshake@lists.linux.dev Date: Wed, 07 Jun 2023 09:58:49 -0400 Message-ID: <168614631895.2082.7594259929276216556.stgit@oracle-102.nfsv4bat.org> In-Reply-To: <168614594328.2082.13408337606138447754.stgit@oracle-102.nfsv4bat.org> References: <168614594328.2082.13408337606138447754.stgit@oracle-102.nfsv4bat.org> User-Agent: StGit/1.5 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org From: Chuck Lever kTLS sockets use CMSG to report decryption errors and the need for session re-keying. For RPC-with-TLS, an "application data" message contains a ULP payload, and that is passed along to the RPC client. An "alert" message triggers connection reset. Everything else is discarded. Signed-off-by: Chuck Lever Reviewed-by: Jeff Layton --- net/sunrpc/xprtsock.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 47 insertions(+), 2 deletions(-) diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c index 37f608c2c0a0..6f2fc863b47e 100644 --- a/net/sunrpc/xprtsock.c +++ b/net/sunrpc/xprtsock.c @@ -47,6 +47,8 @@ #include #include #include +#include + #include #include #include @@ -342,13 +344,56 @@ xs_alloc_sparse_pages(struct xdr_buf *buf, size_t want, gfp_t gfp) return want; } +static int +xs_sock_process_cmsg(struct socket *sock, struct msghdr *msg, + struct cmsghdr *cmsg, int ret) +{ + if (cmsg->cmsg_level == SOL_TLS && + cmsg->cmsg_type == TLS_GET_RECORD_TYPE) { + u8 content_type = *((u8 *)CMSG_DATA(cmsg)); + + switch (content_type) { + case TLS_RECORD_TYPE_DATA: + /* TLS sets EOR at the end of each application data + * record, even though there might be more frames + * waiting to be decrypted. + */ + msg->msg_flags &= ~MSG_EOR; + break; + case TLS_RECORD_TYPE_ALERT: + ret = -ENOTCONN; + break; + default: + ret = -EAGAIN; + } + } + return ret; +} + +static int +xs_sock_recv_cmsg(struct socket *sock, struct msghdr *msg, int flags) +{ + union { + struct cmsghdr cmsg; + u8 buf[CMSG_SPACE(sizeof(u8))]; + } u; + int ret; + + msg->msg_control = &u; + msg->msg_controllen = sizeof(u); + ret = sock_recvmsg(sock, msg, flags); + if (msg->msg_controllen != sizeof(u)) + ret = xs_sock_process_cmsg(sock, msg, &u.cmsg, ret); + return ret; +} + static ssize_t xs_sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags, size_t seek) { ssize_t ret; if (seek != 0) iov_iter_advance(&msg->msg_iter, seek); - ret = sock_recvmsg(sock, msg, flags); + ret = xs_sock_recv_cmsg(sock, msg, flags); return ret > 0 ? ret + seek : ret; } @@ -374,7 +419,7 @@ xs_read_discard(struct socket *sock, struct msghdr *msg, int flags, size_t count) { iov_iter_discard(&msg->msg_iter, ITER_DEST, count); - return sock_recvmsg(sock, msg, flags); + return xs_sock_recv_cmsg(sock, msg, flags); } #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE