From patchwork Fri Jul 17 06:23:28 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11669069 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 021E213B1 for ; Fri, 17 Jul 2020 06:25:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D7CD320737 for ; Fri, 17 Jul 2020 06:25:16 +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="kdONCNhz" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728048AbgGQGZG (ORCPT ); Fri, 17 Jul 2020 02:25:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54002 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727924AbgGQGYj (ORCPT ); Fri, 17 Jul 2020 02:24:39 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3A347C061755; Thu, 16 Jul 2020 23:24:39 -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=Gk0icm7W1l6PNEXjPOF00ZeKuwMt8n5bPcc1urfvli0=; b=kdONCNhzaytXfggMeiqE4liA5Y FXH+SFlM1+3qR6XQC2W1Oaf4xZKwcHTS280Wb7OjSJkro6ZKuR/1KAJwAq+qVtU0I9X6Q5O3435fo wYk5zHTb2J1M7DQwFjefr5Obsa64MfX857EgZzFtKqJtQdmNkd0gYhoJUUgEP2VdhXekZ2pyDGdve 9qda6eWKiRYoNjZCm81FOtLtE+KX4Ef4Qlj62tsEQap1zg8E7qJcPXwGv/7kGhdcwVVNY/3Aj98Y7 laS1Ayw6MYPKpXY2HJCzp5OopcEewXMcxqL8ZWmyG+Y5Ky3TmP1U++jo12psasWq/z5SF90tdWKSj 3++RRymw==; Received: from [2001:4bb8:105:4a81:3772:912d:640:e6c6] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jwJnH-000569-E3; Fri, 17 Jul 2020 06:24:27 +0000 From: Christoph Hellwig To: "David S. Miller" Cc: Alexei Starovoitov , Daniel Borkmann , Chas Williams <3chas3@gmail.com>, Pablo Neira Ayuso , Jozsef Kadlecsik , Florian Westphal , Alexey Kuznetsov , Hideaki YOSHIFUJI , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org, netfilter-devel@vger.kernel.org, linux-sctp@vger.kernel.org, linux-arch@vger.kernel.org, linux-bluetooth@vger.kernel.org, bridge@lists.linux-foundation.org, linux-can@vger.kernel.org, dccp@vger.kernel.org, linux-wpan@vger.kernel.org, mptcp@lists.01.org Subject: [PATCH 19/22] net/ipv6: factor out MCAST_MSFILTER setsockopt helpers Date: Fri, 17 Jul 2020 08:23:28 +0200 Message-Id: <20200717062331.691152-20-hch@lst.de> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200717062331.691152-1-hch@lst.de> References: <20200717062331.691152-1-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 Factor out one helper each for setting the native and compat version of the MCAST_MSFILTER option. Signed-off-by: Christoph Hellwig --- net/ipv6/ipv6_sockglue.c | 159 ++++++++++++++++++++------------------- 1 file changed, 83 insertions(+), 76 deletions(-) diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c index ef5656f876ac05..6aa49495d7bc0b 100644 --- a/net/ipv6/ipv6_sockglue.c +++ b/net/ipv6/ipv6_sockglue.c @@ -171,6 +171,87 @@ static int do_ipv6_mcast_group_source(struct sock *sk, int optname, return ip6_mc_source(add, omode, sk, greqs); } +static int ipv6_set_mcast_msfilter(struct sock *sk, void __user *optval, + int optlen) +{ + struct group_filter *gsf; + int ret; + + if (optlen < GROUP_FILTER_SIZE(0)) + return -EINVAL; + if (optlen > sysctl_optmem_max) + return -ENOBUFS; + + gsf = memdup_user(optval, optlen); + if (IS_ERR(gsf)) + return PTR_ERR(gsf); + + /* numsrc >= (4G-140)/128 overflow in 32 bits */ + ret = -ENOBUFS; + if (gsf->gf_numsrc >= 0x1ffffffU || + gsf->gf_numsrc > sysctl_mld_max_msf) + goto out_free_gsf; + + ret = -EINVAL; + if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) + goto out_free_gsf; + + ret = ip6_mc_msfilter(sk, gsf, gsf->gf_slist); +out_free_gsf: + kfree(gsf); + return ret; +} + +#ifdef CONFIG_COMPAT +static int compat_ipv6_set_mcast_msfilter(struct sock *sk, void __user *optval, + int optlen) +{ + const int size0 = offsetof(struct compat_group_filter, gf_slist); + struct compat_group_filter *gf32; + void *p; + int ret; + int n; + + if (optlen < size0) + return -EINVAL; + if (optlen > sysctl_optmem_max - 4) + return -ENOBUFS; + + p = kmalloc(optlen + 4, GFP_KERNEL); + if (!p) + return -ENOMEM; + + gf32 = p + 4; /* we want ->gf_group and ->gf_slist aligned */ + ret = -EFAULT; + if (copy_from_user(gf32, optval, optlen)) + goto out_free_p; + + /* numsrc >= (4G-140)/128 overflow in 32 bits */ + ret = -ENOBUFS; + n = gf32->gf_numsrc; + if (n >= 0x1ffffffU || n > sysctl_mld_max_msf) + goto out_free_p; + + ret = -EINVAL; + if (offsetof(struct compat_group_filter, gf_slist[n]) > optlen) + goto out_free_p; + + rtnl_lock(); + lock_sock(sk); + ret = ip6_mc_msfilter(sk, &(struct group_filter){ + .gf_interface = gf32->gf_interface, + .gf_group = gf32->gf_group, + .gf_fmode = gf32->gf_fmode, + .gf_numsrc = gf32->gf_numsrc}, gf32->gf_slist); + release_sock(sk); + rtnl_unlock(); + +out_free_p: + kfree(p); + return ret; +} +#endif + static int do_ipv6_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen) { @@ -762,37 +843,8 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname, break; } case MCAST_MSFILTER: - { - struct group_filter *gsf; - - if (optlen < GROUP_FILTER_SIZE(0)) - goto e_inval; - if (optlen > sysctl_optmem_max) { - retv = -ENOBUFS; - break; - } - gsf = memdup_user(optval, optlen); - if (IS_ERR(gsf)) { - retv = PTR_ERR(gsf); - break; - } - /* numsrc >= (4G-140)/128 overflow in 32 bits */ - if (gsf->gf_numsrc >= 0x1ffffffU || - gsf->gf_numsrc > sysctl_mld_max_msf) { - kfree(gsf); - retv = -ENOBUFS; - break; - } - if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { - kfree(gsf); - retv = -EINVAL; - break; - } - retv = ip6_mc_msfilter(sk, gsf, gsf->gf_slist); - kfree(gsf); - + retv = ipv6_set_mcast_msfilter(sk, optval, optlen); break; - } case IPV6_ROUTER_ALERT: if (optlen < sizeof(int)) goto e_inval; @@ -977,52 +1029,7 @@ int compat_ipv6_setsockopt(struct sock *sk, int level, int optname, return err; } case MCAST_MSFILTER: - { - const int size0 = offsetof(struct compat_group_filter, gf_slist); - struct compat_group_filter *gf32; - void *p; - int n; - - if (optlen < size0) - return -EINVAL; - if (optlen > sysctl_optmem_max - 4) - return -ENOBUFS; - - p = kmalloc(optlen + 4, GFP_KERNEL); - if (!p) - return -ENOMEM; - - gf32 = p + 4; /* we want ->gf_group and ->gf_slist aligned */ - if (copy_from_user(gf32, optval, optlen)) { - err = -EFAULT; - goto mc_msf_out; - } - - n = gf32->gf_numsrc; - /* numsrc >= (4G-140)/128 overflow in 32 bits */ - if (n >= 0x1ffffffU || - n > sysctl_mld_max_msf) { - err = -ENOBUFS; - goto mc_msf_out; - } - if (offsetof(struct compat_group_filter, gf_slist[n]) > optlen) { - err = -EINVAL; - goto mc_msf_out; - } - - rtnl_lock(); - lock_sock(sk); - err = ip6_mc_msfilter(sk, &(struct group_filter){ - .gf_interface = gf32->gf_interface, - .gf_group = gf32->gf_group, - .gf_fmode = gf32->gf_fmode, - .gf_numsrc = gf32->gf_numsrc}, gf32->gf_slist); - release_sock(sk); - rtnl_unlock(); -mc_msf_out: - kfree(p); - return err; - } + return compat_ipv6_set_mcast_msfilter(sk, optval, optlen); } err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);