From patchwork Thu Jul 23 06:08:44 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11679939 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id EAF0A722 for ; Thu, 23 Jul 2020 06:09:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D1FE52086A for ; Thu, 23 Jul 2020 06:09:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="AHWMVgl+" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726691AbgGWGJd (ORCPT ); Thu, 23 Jul 2020 02:09:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56438 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726522AbgGWGJb (ORCPT ); Thu, 23 Jul 2020 02:09:31 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F31CEC0619E3; Wed, 22 Jul 2020 23:09:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=jnNftkdWuHutn0l5/V2Gz6Qvt1s8tXbdDMQLxkwuHBo=; b=AHWMVgl+gZI3ppeRUJG22CnuN2 mXsqGUtHr7hHIshIeM0BR3FDFu7P8hUJdDKWEDjaeFBPFzHAKS1/J2NqqrgVWAiWy0PDBIJV6MaAk gPot77jPYt8McodlLqHe4rYj1xwXIh3dwL7d5dP2a47D69tnzjzBjxRqbyL4qtqPcLy6LsSPLTz8/ YOabKmimQamGM4cxDNfekHWNUuwVnDebo84hbzn4arDbH1CmgtyNxmN2OFQxyAhRHpoT37cldfrc6 Ax/DteamlOzerpb/bK5cMQkwL7vWGfqduGUdI9Ez5lzvt3eBZC1+o7Ayqr6UYOa2Jd5AGGDGAZ45S 4D3R2EfQ==; Received: from [2001:4bb8:18c:2acc:91df:aae8:fa3b:de9c] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jyUPo-0003jj-5f; Thu, 23 Jul 2020 06:09:12 +0000 From: Christoph Hellwig To: "David S. Miller" , Jakub Kicinski , Alexei Starovoitov , Daniel Borkmann , Alexey Kuznetsov , Hideaki YOSHIFUJI , Eric Dumazet Cc: linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, linux-sctp@vger.kernel.org, linux-hams@vger.kernel.org, linux-bluetooth@vger.kernel.org, bridge@lists.linux-foundation.org, linux-can@vger.kernel.org, dccp@vger.kernel.org, linux-decnet-user@lists.sourceforge.net, linux-wpan@vger.kernel.org, linux-s390@vger.kernel.org, mptcp@lists.01.org, lvs-devel@vger.kernel.org, rds-devel@oss.oracle.com, linux-afs@lists.infradead.org, tipc-discussion@lists.sourceforge.net, linux-x25@vger.kernel.org Subject: [PATCH 02/26] net/bpfilter: split __bpfilter_process_sockopt Date: Thu, 23 Jul 2020 08:08:44 +0200 Message-Id: <20200723060908.50081-3-hch@lst.de> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200723060908.50081-1-hch@lst.de> References: <20200723060908.50081-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-wpan-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wpan@vger.kernel.org Split __bpfilter_process_sockopt into a low-level send request routine and the actual setsockopt hook to split the init time ping from the actual setsockopt processing. Signed-off-by: Christoph Hellwig --- net/bpfilter/bpfilter_kern.c | 51 +++++++++++++++++++----------------- 1 file changed, 27 insertions(+), 24 deletions(-) diff --git a/net/bpfilter/bpfilter_kern.c b/net/bpfilter/bpfilter_kern.c index 3bac5820062af1..78d561f2c54da7 100644 --- a/net/bpfilter/bpfilter_kern.c +++ b/net/bpfilter/bpfilter_kern.c @@ -31,48 +31,51 @@ static void __stop_umh(void) shutdown_umh(); } -static int __bpfilter_process_sockopt(struct sock *sk, int optname, - char __user *optval, - unsigned int optlen, bool is_set) +static int bpfilter_send_req(struct mbox_request *req) { - struct mbox_request req; struct mbox_reply reply; loff_t pos; ssize_t n; - int ret = -EFAULT; - req.is_set = is_set; - req.pid = current->pid; - req.cmd = optname; - req.addr = (uintptr_t)optval; - req.len = optlen; if (!bpfilter_ops.info.tgid) - goto out; + return -EFAULT; pos = 0; - n = kernel_write(bpfilter_ops.info.pipe_to_umh, &req, sizeof(req), + n = kernel_write(bpfilter_ops.info.pipe_to_umh, req, sizeof(*req), &pos); - if (n != sizeof(req)) { + if (n != sizeof(*req)) { pr_err("write fail %zd\n", n); - __stop_umh(); - ret = -EFAULT; - goto out; + goto stop; } pos = 0; n = kernel_read(bpfilter_ops.info.pipe_from_umh, &reply, sizeof(reply), &pos); if (n != sizeof(reply)) { pr_err("read fail %zd\n", n); - __stop_umh(); - ret = -EFAULT; - goto out; + goto stop; } - ret = reply.status; -out: - return ret; + return reply.status; +stop: + __stop_umh(); + return -EFAULT; +} + +static int bpfilter_process_sockopt(struct sock *sk, int optname, + char __user *optval, unsigned int optlen, + bool is_set) +{ + struct mbox_request req = { + .is_set = is_set, + .pid = current->pid, + .cmd = optname, + .addr = (uintptr_t)optval, + .len = optlen, + }; + return bpfilter_send_req(&req); } static int start_umh(void) { + struct mbox_request req = { .pid = current->pid }; int err; /* fork usermode process */ @@ -82,7 +85,7 @@ static int start_umh(void) pr_info("Loaded bpfilter_umh pid %d\n", pid_nr(bpfilter_ops.info.tgid)); /* health check that usermode process started correctly */ - if (__bpfilter_process_sockopt(NULL, 0, NULL, 0, 0) != 0) { + if (bpfilter_send_req(&req) != 0) { shutdown_umh(); return -EFAULT; } @@ -103,7 +106,7 @@ static int __init load_umh(void) mutex_lock(&bpfilter_ops.lock); err = start_umh(); if (!err && IS_ENABLED(CONFIG_INET)) { - bpfilter_ops.sockopt = &__bpfilter_process_sockopt; + bpfilter_ops.sockopt = &bpfilter_process_sockopt; bpfilter_ops.start = &start_umh; } mutex_unlock(&bpfilter_ops.lock);