From patchwork Wed Aug 3 20:47:17 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin KaFai Lau X-Patchwork-Id: 12935903 X-Patchwork-Delegate: bpf@iogearbox.net 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 A6B7DC19F2C for ; Wed, 3 Aug 2022 20:50:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238842AbiHCUup (ORCPT ); Wed, 3 Aug 2022 16:50:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55810 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238838AbiHCUui (ORCPT ); Wed, 3 Aug 2022 16:50:38 -0400 Received: from mx0a-00082601.pphosted.com (mx0b-00082601.pphosted.com [67.231.153.30]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8E5F11EEC5 for ; Wed, 3 Aug 2022 13:50:18 -0700 (PDT) Received: from pps.filterd (m0001303.ppops.net [127.0.0.1]) by m0001303.ppops.net (8.17.1.5/8.17.1.5) with ESMTP id 273ErW5b001364 for ; Wed, 3 Aug 2022 13:50:17 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=facebook; bh=oLoq0XAqFBD1KiKoxhQcp05Cajd6NWJw8RAKDt/DL0A=; b=UMWbUMKeEvPgthmXl7Wq3jj98idKjUKTqMjYgjBzgorqHLYfCpVS+r4LRrSwramnm5ib pih6p6FzdDVQL0hi2juqk94U3Cu3JbwdkAM2yP6sSrRcLwD6layggKRsxVMz9sfRFt7C pl1bZmhxMMVA5dVRdCMsSWk8Vyk5Wv9doUE= Received: from mail.thefacebook.com ([163.114.132.120]) by m0001303.ppops.net (PPS) with ESMTPS id 3hqbqx7cx2-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 03 Aug 2022 13:50:17 -0700 Received: from twshared14818.18.frc3.facebook.com (2620:10d:c085:108::4) by mail.thefacebook.com (2620:10d:c085:21d::4) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.28; Wed, 3 Aug 2022 13:50:16 -0700 Received: by devbig933.frc1.facebook.com (Postfix, from userid 6611) id 4D7007A3F81B; Wed, 3 Aug 2022 13:47:17 -0700 (PDT) From: Martin KaFai Lau To: , CC: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , David Miller , Eric Dumazet , Jakub Kicinski , , Paolo Abeni , Stanislav Fomichev Subject: [PATCH v2 bpf-next 12/15] bpf: Change bpf_setsockopt(SOL_IP) to reuse do_ip_setsockopt() Date: Wed, 3 Aug 2022 13:47:17 -0700 Message-ID: <20220803204717.3081496-1-kafai@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220803204601.3075863-1-kafai@fb.com> References: <20220803204601.3075863-1-kafai@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-ORIG-GUID: L7DYJIjcadWdRSHDWMP4lngaIv3TeHo_ X-Proofpoint-GUID: L7DYJIjcadWdRSHDWMP4lngaIv3TeHo_ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.883,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-08-03_06,2022-08-02_01,2022-06-22_01 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net After the prep work in the previous patches, this patch removes the dup code from bpf_setsockopt(SOL_IP) and reuses the implementation in do_ip_setsockopt(). The existing optname white-list is refactored into a new function sol_ip_setsockopt(). NOTE, the current bpf_setsockopt(IP_TOS) is quite different from the the do_ip_setsockopt(IP_TOS). For example, it does not take the INET_ECN_MASK into the account for tcp and also does not adjust sk->sk_priority. It looks like the current bpf_setsockopt(IP_TOS) was referencing the IPV6_TCLASS implementation instead of IP_TOS. This patch tries to rectify that by using the do_ip_setsockopt(IP_TOS). While this is a behavior change, the do_ip_setsockopt(IP_TOS) behavior is arguably what the user is expecting. At least, the INET_ECN_MASK bits should be masked out for tcp. Signed-off-by: Martin KaFai Lau --- include/net/ip.h | 2 ++ net/core/filter.c | 40 ++++++++++++++++++++-------------------- net/ipv4/ip_sockglue.c | 4 ++-- 3 files changed, 24 insertions(+), 22 deletions(-) diff --git a/include/net/ip.h b/include/net/ip.h index 1c979fd1904c..34fa5b0f0a0e 100644 --- a/include/net/ip.h +++ b/include/net/ip.h @@ -743,6 +743,8 @@ void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk, int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc, bool allow_ipv6); DECLARE_STATIC_KEY_FALSE(ip4_min_ttl); +int do_ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, + unsigned int optlen); int ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, unsigned int optlen); int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, diff --git a/net/core/filter.c b/net/core/filter.c index 0c5361b8906d..d236f71ff501 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -5123,6 +5123,25 @@ static int sol_tcp_setsockopt(struct sock *sk, int optname, KERNEL_SOCKPTR(optval), optlen); } +static int sol_ip_setsockopt(struct sock *sk, int optname, + char *optval, int optlen) +{ + if (sk->sk_family != AF_INET) + return -EINVAL; + + switch (optname) { + case IP_TOS: + if (optlen != sizeof(int)) + return -EINVAL; + break; + default: + return -EINVAL; + } + + return do_ip_setsockopt(sk, SOL_IP, optname, + KERNEL_SOCKPTR(optval), optlen); +} + static int __bpf_setsockopt(struct sock *sk, int level, int optname, char *optval, int optlen) { @@ -5134,26 +5153,7 @@ static int __bpf_setsockopt(struct sock *sk, int level, int optname, if (level == SOL_SOCKET) { return sol_socket_setsockopt(sk, optname, optval, optlen); } else if (IS_ENABLED(CONFIG_INET) && level == SOL_IP) { - if (optlen != sizeof(int) || sk->sk_family != AF_INET) - return -EINVAL; - - val = *((int *)optval); - /* Only some options are supported */ - switch (optname) { - case IP_TOS: - if (val < -1 || val > 0xff) { - ret = -EINVAL; - } else { - struct inet_sock *inet = inet_sk(sk); - - if (val == -1) - val = 0; - inet->tos = val; - } - break; - default: - ret = -EINVAL; - } + return sol_ip_setsockopt(sk, optname, optval, optlen); } else if (IS_ENABLED(CONFIG_IPV6) && level == SOL_IPV6) { if (optlen != sizeof(int) || sk->sk_family != AF_INET6) return -EINVAL; diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c index a3c496580e6b..751fa69cb557 100644 --- a/net/ipv4/ip_sockglue.c +++ b/net/ipv4/ip_sockglue.c @@ -888,8 +888,8 @@ static int compat_ip_mcast_join_leave(struct sock *sk, int optname, DEFINE_STATIC_KEY_FALSE(ip4_min_ttl); -static int do_ip_setsockopt(struct sock *sk, int level, int optname, - sockptr_t optval, unsigned int optlen) +int do_ip_setsockopt(struct sock *sk, int level, int optname, + sockptr_t optval, unsigned int optlen) { struct inet_sock *inet = inet_sk(sk); struct net *net = sock_net(sk);