From patchwork Thu May 21 00:37:14 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Al Viro X-Patchwork-Id: 1294857 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=ZenIV.linux.org.uk Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 49S9hK6KYJz9sRf for ; Thu, 21 May 2020 10:38:09 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728213AbgEUAiC (ORCPT ); Wed, 20 May 2020 20:38:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38560 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727996AbgEUAhZ (ORCPT ); Wed, 20 May 2020 20:37:25 -0400 Received: from ZenIV.linux.org.uk (zeniv.linux.org.uk [IPv6:2002:c35c:fd02::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 781CAC05BD43; Wed, 20 May 2020 17:37:25 -0700 (PDT) Received: from viro by ZenIV.linux.org.uk with local (Exim 4.93 #3 (Red Hat Linux)) id 1jbZD9-00Cgef-MG; Thu, 21 May 2020 00:37:23 +0000 From: Al Viro To: netdev@vger.kernel.org Cc: davem@davemloft.net, viro@zeniv.linux.org.uk, linux-kernel@vger.kernel.org Subject: [PATCH net-next 12/19] handle the group_source_req options directly Date: Thu, 21 May 2020 01:37:14 +0100 Message-Id: <20200521003721.3023783-12-viro@ZenIV.linux.org.uk> X-Mailer: git-send-email 2.25.4 In-Reply-To: <20200521003721.3023783-1-viro@ZenIV.linux.org.uk> References: <20200521003657.GE23230@ZenIV.linux.org.uk> <20200521003721.3023783-1-viro@ZenIV.linux.org.uk> MIME-Version: 1.0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Al Viro Native ->setsockopt() handling of these options (MCAST_..._SOURCE_GROUP and MCAST_{,UN}BLOCK_SOURCE) consists of copyin + call of a helper that does the actual work. The only change needed for ->compat_setsockopt() is a slightly different copyin - the helpers can be reused as-is. Signed-off-by: Al Viro --- net/ipv4/ip_sockglue.c | 23 +++++++++++++++++++++-- net/ipv6/ipv6_sockglue.c | 23 +++++++++++++++++++++-- 2 files changed, 42 insertions(+), 4 deletions(-) diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c index 7f065a68664e..a2469bc57cfe 100644 --- a/net/ipv4/ip_sockglue.c +++ b/net/ipv4/ip_sockglue.c @@ -1322,8 +1322,27 @@ int compat_ip_setsockopt(struct sock *sk, int level, int optname, case MCAST_LEAVE_SOURCE_GROUP: case MCAST_BLOCK_SOURCE: case MCAST_UNBLOCK_SOURCE: - return compat_mc_setsockopt(sk, level, optname, optval, optlen, - ip_setsockopt); + { + struct compat_group_source_req __user *gsr32 = (void __user *)optval; + struct group_source_req greqs; + + if (optlen != sizeof(struct compat_group_source_req)) + return -EINVAL; + + if (get_user(greqs.gsr_interface, &gsr32->gsr_interface) || + copy_from_user(&greqs.gsr_group, &gsr32->gsr_group, + sizeof(greqs.gsr_group)) || + copy_from_user(&greqs.gsr_source, &gsr32->gsr_source, + sizeof(greqs.gsr_source))) + return -EFAULT; + + rtnl_lock(); + lock_sock(sk); + err = do_mcast_group_source(sk, optname, &greqs); + release_sock(sk); + rtnl_unlock(); + return err; + } case MCAST_MSFILTER: { const int size0 = offsetof(struct compat_group_filter, gf_slist); diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c index bb049feeb787..e10258c2210e 100644 --- a/net/ipv6/ipv6_sockglue.c +++ b/net/ipv6/ipv6_sockglue.c @@ -1015,8 +1015,27 @@ int compat_ipv6_setsockopt(struct sock *sk, int level, int optname, case MCAST_LEAVE_SOURCE_GROUP: case MCAST_BLOCK_SOURCE: case MCAST_UNBLOCK_SOURCE: - return compat_mc_setsockopt(sk, level, optname, optval, optlen, - ipv6_setsockopt); + { + struct compat_group_source_req __user *gsr32 = (void __user *)optval; + struct group_source_req greqs; + + if (optlen < sizeof(struct compat_group_source_req)) + return -EINVAL; + + if (get_user(greqs.gsr_interface, &gsr32->gsr_interface) || + copy_from_user(&greqs.gsr_group, &gsr32->gsr_group, + sizeof(greqs.gsr_group)) || + copy_from_user(&greqs.gsr_source, &gsr32->gsr_source, + sizeof(greqs.gsr_source))) + return -EFAULT; + + rtnl_lock(); + lock_sock(sk); + err = do_ipv6_mcast_group_source(sk, optname, &greqs); + release_sock(sk); + rtnl_unlock(); + return err; + } case MCAST_MSFILTER: { const int size0 = offsetof(struct compat_group_filter, gf_slist);